JP7258618B2

JP7258618B2 - chiller unit

Info

Publication number: JP7258618B2
Application number: JP2019056821A
Authority: JP
Inventors: 正広寺岡
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2023-04-17
Anticipated expiration: 2039-03-25
Also published as: JP2020159585A

Description

本発明は、チラーユニットに関するものである。 The present invention relates to chiller units.

チラーユニットは、複数の冷凍サイクルを備え、各冷凍サイクルに接続された水熱交換器において冷媒と水とを熱交換させることによって冷水又は温水を生成する。生成された冷水又は温水は、外部へ導かれて、室内の冷暖房や給湯に用いられる。 A chiller unit is provided with a plurality of refrigerating cycles, and generates cold water or hot water by exchanging heat between a refrigerant and water in a water heat exchanger connected to each refrigerating cycle. The generated cold water or hot water is led to the outside and used for indoor air conditioning and hot water supply.

チラーユニットには、各冷凍サイクルに１台ずつ水熱交換器が設置されるものや、複数系統の冷凍サイクルのうち２系統の冷凍サイクルに１台の水熱交換器が共有されて設置されるものがある。 In the chiller unit, one water heat exchanger is installed for each refrigerating cycle, or one water heat exchanger is installed for two refrigerating cycles among multiple refrigerating cycles. there is something

下記の特許文献１には、チラーユニットが、第１水熱交換器を有する第１冷媒サイクル系統と、第２水熱交換器を有する第２冷媒サイクル系統と、第３水熱交換器を共有する第３冷媒サイクル系統及び第４冷媒サイクル系統とを備え、第１水熱交換器と第２水熱交換器が水配管によって並列に接続され、第３水熱交換器が第１及び第２水熱交換器に対して水配管によって直列に接続される構成が開示されている。 In Patent Document 1 below, a chiller unit shares a first refrigerant cycle system having a first water heat exchanger, a second refrigerant cycle system having a second water heat exchanger, and a third water heat exchanger. A third refrigerant cycle system and a fourth refrigerant cycle system are provided, the first water heat exchanger and the second water heat exchanger are connected in parallel by water piping, and the third water heat exchanger is connected to the first and second A configuration is disclosed in which water pipes are connected in series to a water heat exchanger.

特開２０１７－１０６６４３号公報JP 2017-106643 A

チラーユニットの熱交換器では、冷凍サイクルを循環する冷媒と、水配管を流れる水とが熱交換可能に構成されている。熱交換器では、冷媒の流れ方向と水の流れ方向が同じである並行流よりも、冷媒の流れ方向と水の流れ方向が向かい合う対向流の方が効率良く熱交換を行うことができる。 The heat exchanger of the chiller unit is configured to allow heat exchange between the refrigerant circulating in the refrigerating cycle and the water flowing in the water pipe. In a heat exchanger, heat can be exchanged more efficiently with a counter flow in which the direction of flow of the refrigerant and the direction of water are opposite to the parallel flow in which the direction of flow of the refrigerant and the direction of water are the same.

チラーユニットにおける冷凍サイクルは、冷房運転時と暖房運転時とでは冷媒の流れ方向が逆となるため、運転の切り換えに応じて、熱交換器における冷媒の流れ方向と水の流れ方向が、並行流となったり、対向流となったりする。そのため、上記特許文献１の構成では、冷房運転と暖房運転の切り換えに応じて、熱交換器において並行流と対向流が切り換わるため、熱交換効率が変動するという問題がある。 In the refrigeration cycle of a chiller unit, the direction of refrigerant flow is opposite between cooling operation and heating operation. or a countercurrent flow. Therefore, in the configuration of Patent Document 1, the parallel flow and the counter flow are switched in the heat exchanger according to the switching between the cooling operation and the heating operation, so there is a problem that the heat exchange efficiency fluctuates.

本発明は、このような事情に鑑みてなされたものであって、冷凍サイクル系統における冷房運転と暖房運転の切り換えに関わらず、水熱交換器において効率良く熱交換を行うことが可能なチラーユニットを提供することを目的とする。 The present invention has been made in view of such circumstances, and a chiller unit capable of efficiently exchanging heat in a water heat exchanger regardless of switching between cooling operation and heating operation in a refrigeration cycle system. intended to provide

上記課題を解決するために、本発明のチラーユニットは以下の手段を採用する。
すなわち、本発明に係るチラーユニットは、第１水熱交換器を有し、冷媒が循環する第１冷凍サイクル系統と、第２水熱交換器を有し、冷媒が循環する第２冷凍サイクル系統と、第３水熱交換器を共有し、冷媒がそれぞれ循環する第３冷凍サイクル系統及び第４冷凍サイクル系統と、前記第１水熱交換器、前記第２水熱交換器及び前記第３水熱交換器に接続され、水が流通する水配管とを備え、前記第１水熱交換器と前記第２水熱交換器が前記水配管によって並列に接続され、前記第３水熱交換器が前記第１水熱交換器及び前記第２水熱交換器に対して前記水配管によって直列に接続され、前記第１水熱交換器と前記第２水熱交換器において、前記第１冷凍サイクル系統及び前記第２冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、及び／又は、前記第３水熱交換器において、前記第３冷凍サイクル系統及び前記第４冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、前記水配管が構成されている。 In order to solve the above problems, the chiller unit of the present invention employs the following means.
That is, the chiller unit according to the present invention includes a first refrigerating cycle system having a first water heat exchanger and circulating a refrigerant, and a second refrigerating cycle system having a second water heat exchanger and circulating a refrigerant. and a third refrigerating cycle system and a fourth refrigerating cycle system that share a third water heat exchanger, and refrigerant circulates, respectively, the first water heat exchanger, the second water heat exchanger, and the third water A water pipe connected to a heat exchanger and through which water flows, wherein the first water heat exchanger and the second water heat exchanger are connected in parallel by the water pipe, and the third water heat exchanger is connected in series by the water pipe to the first water heat exchanger and the second water heat exchanger, and in the first water heat exchanger and the second water heat exchanger, the first refrigeration cycle system and in accordance with the switching between the cooling operation and the heating operation of the second refrigerating cycle system, so that the flow direction of the refrigerant and the flow direction of the water are counterflows, and/or the third water heat exchanger in the water pipe so that the flow direction of the refrigerant and the flow direction of the water are counterflows in response to switching between the cooling operation and the heating operation of the third refrigeration cycle system and the fourth refrigeration cycle system is configured.

この構成によれば、第１冷凍サイクル系統と第２冷凍サイクル系統においては、それぞれ第１水熱交換器と第２水熱交換器によって冷媒と水との熱交換が個別に行われ、第３冷凍サイクル系統と第４冷凍サイクル系統においては、第３水熱交換器を共有しながら冷媒と水との熱交換が行われる。 According to this configuration, in the first refrigeration cycle system and the second refrigeration cycle system, the heat exchange between the refrigerant and the water is performed separately by the first water heat exchanger and the second water heat exchanger, respectively. In the refrigerating cycle system and the fourth refrigerating cycle system, heat exchange between the refrigerant and water is performed while sharing the third water heat exchanger.

第１水熱交換器と第２水熱交換器とが水配管によって並列に接続されているため、第１冷凍サイクル系統と第２冷凍サイクル系統の冷媒を均等に水と熱交換させ、冷媒と水とを効率良く熱交換させることができる。 Since the first water heat exchanger and the second water heat exchanger are connected in parallel by water pipes, the refrigerant in the first refrigeration cycle system and the second refrigeration cycle system are evenly heat-exchanged with water, and the refrigerant and It can efficiently exchange heat with water.

また、冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることができる。その結果、各熱交換器において、効率良く熱交換を行うことができる。 In addition, the direction of flow of the refrigerant in the refrigeration cycle system and the direction of flow of the water pipe can always be made counter-flow according to the switching between the cooling operation and the heating operation of the refrigeration cycle system. As a result, heat can be efficiently exchanged in each heat exchanger.

上記発明において、前記第３水熱交換器が前記第１水熱交換器と前記第２水熱交換器の下流側に前記水配管によって接続されてもよい。 In the above invention, the third water heat exchanger may be connected downstream of the first water heat exchanger and the second water heat exchanger by the water pipe.

この構成によれば、水の圧力が高い入口側の方に第１水熱交換器と第２水熱交換器の２基の水熱交換器が設けられる態様となるため、各水熱交換器における水の偏流を抑制して冷媒と水とを効率良く熱交換させることができる。 According to this configuration, since two water heat exchangers, the first water heat exchanger and the second water heat exchanger, are provided on the inlet side where the water pressure is high, each water heat exchanger It is possible to suppress the uneven flow of water in and to efficiently exchange heat between the refrigerant and the water.

上記発明において、前記水配管に設置され、第１接続口、第２接続口、第３接続口及び第４接続口を有する四方弁とを備え、前記第１接続口において前記水配管を流れる前記水が前記四方弁に常に流入し、前記第４接続口において前記第１水熱交換器と前記第２水熱交換器を流通した前記水、又は、前記第３水熱交換器を流通した前記水が前記四方弁から常に流出し、前記第２接続口と前記第１水熱交換器と前記第２水熱交換器の一端側の接続口、又は、前記第３水熱交換器の一端側の接続口とが前記水配管によって接続され、前記第３接続口と前記第１水熱交換器と前記第２水熱交換器の他端側の接続口、又は、前記第３水熱交換器の他端側の接続口とが前記水配管によって接続され、前記四方弁は、前記第１接続口と前記第２接続口が流通可能となり、かつ、前記第３接続口と前記第４接続口が流通可能となる第１モード、又は、前記第１接続口と前記第３接続口が流通可能となり、かつ、前記第２接続口と前記第４接続口が流通可能となる第２モードに切り換え可能である構成を有してもよい。 In the above invention, a four-way valve installed in the water pipe and having a first connection port, a second connection port, a third connection port, and a fourth connection port, and the water flowing through the water pipe at the first connection port. Water always flows into the four-way valve, and the water that flows through the first water heat exchanger and the second water heat exchanger at the fourth connection port, or the water that flows through the third water heat exchanger Water always flows out from the four-way valve, and the connection port on one end side of the second connection port, the first water heat exchanger and the second water heat exchanger, or the one end side of the third water heat exchanger The connection port is connected by the water pipe, and the connection port on the other end side of the third connection port, the first water heat exchanger, and the second water heat exchanger, or the third water heat exchanger and a connection port on the other end side of the four-way valve are connected by the water pipe, and the four-way valve allows the first connection port and the second connection port to flow, and the third connection port and the fourth connection port. or the second mode in which the first connection port and the third connection port become circulated and the second connection port and the fourth connection port become circulated. You may have a configuration that is possible.

この構成によれば、四方弁が第１モードに切り換えられているとき、第１接続口において水配管を流れる水が流入し、第１接続口から第２接続口へ水が流れた後、第２接続口から水熱交換器へ水が供給される。また、第１モードでは、水熱交換器を流れた水が第３接続口から流入し、第３接続口から第４接続口へ水が流れた後、第４接続口から水が外部へ流出する。また、四方弁が第２モードに切り換えられているとき、第１接続口において水配管を流れる水が流入し、第１接続口から第３接続口へ水が流れた後、第３接続口から水熱交換器へ水が供給される。また、第２モードでは、水熱交換器を流れた水が第２接続口から流入し、第２接続口から第４接続口へ水が流れた後、第４接続口から水が外部へ流出する。 According to this configuration, when the four-way valve is switched to the first mode, the water flowing through the water pipe flows into the first connection port, and after the water flows from the first connection port to the second connection port, the second Water is supplied to the water heat exchanger from the 2 connection port. In the first mode, the water that has flowed through the water heat exchanger flows in from the third connection port, and after the water flows from the third connection port to the fourth connection port, the water flows out from the fourth connection port. do. Further, when the four-way valve is switched to the second mode, the water flowing through the water pipe flows in at the first connection port, and after the water flows from the first connection port to the third connection port, from the third connection port Water is supplied to the water heat exchanger. In the second mode, the water that has flowed through the water heat exchanger flows in from the second connection port, and after the water flows from the second connection port to the fourth connection port, the water flows out from the fourth connection port. do.

よって、四方弁を切り換えることによって、熱交換器に接続された水配管の流れ方向を変更することが可能である。したがって、冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、四方弁を切り換えることで、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることができる。また、四方弁の切り換えに関わらず、水配管には常に水が流れており、水が流れない系統が存在しない。したがって、熱交換器に接続された水配管の流れ方向を変更する場合において、水の流れ方向を迅速に切り換え可能とし、また、不具合を生じにくくすることができる。 Therefore, by switching the four-way valve, it is possible to change the flow direction of the water pipe connected to the heat exchanger. Therefore, by switching the four-way valve according to the switching between the cooling operation and the heating operation of the refrigerating cycle system, the direction of flow of the refrigerant in the refrigerating cycle system and the direction of flow of the water pipe can always be counterflows. In addition, regardless of switching of the four-way valve, water always flows through the water piping, and there is no system in which water does not flow. Therefore, when changing the flow direction of the water pipe connected to the heat exchanger, it is possible to quickly switch the water flow direction, and it is possible to prevent problems from occurring.

また、四方弁の設置個数は一つであり、三方弁を設置する場合の設置個数に比べて低減されるため、部品点数を減らすことができる。また、三方弁を設置する場合、複数の三方弁が動作する必要があるのに対して、一つの四方弁が動作すればよいため、動作ミスによる切り換えの不具合が生じにくい。 In addition, since the number of four-way valves to be installed is one, which is smaller than the number of installations when three-way valves are installed, the number of parts can be reduced. In addition, when a three-way valve is installed, a plurality of three-way valves need to be operated, whereas only one four-way valve is required to operate.

上記発明において、前記四方弁は、ユニット本体の内部に設置されてもよい。 In the above invention, the four-way valve may be installed inside the unit main body.

この構成によれば、ユニット本体の内部に四方弁が設置されていることから、チリングユニットを外部の水配管と接続するだけで、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることが可能な系統を構成することができる。 According to this configuration, since the four-way valve is installed inside the unit body, simply by connecting the chilling unit to the external water pipe, the flow direction of the refrigerant in the refrigeration cycle system and the flow direction of the water pipe are always adjusted. It is possible to configure a system capable of countercurrent flow.

上記発明において、前記四方弁は、ユニット本体の外部に設置され、前記ユニット本体の内部に設置された前記水配管と接続されてもよい。 In the above invention, the four-way valve may be installed outside the unit main body and connected to the water pipe installed inside the unit main body.

上記発明において、前記水配管において、前記第１水熱交換器及び前記第２水熱交換器と前記第３水熱交換器の間に設置された第１三方弁と、一端が前記第１水熱交換器と前記第２水熱交換器の上流側の前記水配管と接続され、他端が前記第１三方弁と接続された第１分岐管と、前記水配管において、前記第１水熱交換器及び前記第２水熱交換器と、前記第３水熱交換器の間において、前記第１三方弁よりも前記第３水熱交換器側に設置された第２三方弁と、一端が前記第２三方弁と接続され、他端が前記第３水熱交換器の下流側の前記水配管と接続された第２分岐管と、前記水配管と前記第１分岐管の接続部分と、前記第１水熱交換器及び前記第２水熱交換器の間に設置された第３三方弁と、前記第３水熱交換器と、前記水配管の前記第２分岐管の接続部分の間に設置された第４三方弁と、一端が前記第３三方弁と接続され、他端が前記第４三方弁と接続された第３分岐管とを備えてもよい。 In the above invention, in the water pipe, a first three-way valve installed between the first water heat exchanger, the second water heat exchanger, and the third water heat exchanger; A first branch pipe connected to the water pipe on the upstream side of the heat exchanger and the second water heat exchanger and having the other end connected to the first three-way valve, and in the water pipe, the first hydrothermal between the exchanger and the second water heat exchanger, and the third water heat exchanger, a second three-way valve installed on the side of the third water heat exchanger rather than the first three-way valve; a second branch pipe connected to the second three-way valve and having the other end connected to the water pipe downstream of the third water heat exchanger; a connection portion between the water pipe and the first branch pipe; Between the third three-way valve installed between the first water heat exchanger and the second water heat exchanger, the third water heat exchanger, and the connecting portion of the second branch pipe of the water pipe and a third branch pipe having one end connected to the third three-way valve and the other end connected to the fourth three-way valve.

この構成によれば、熱交換器において水配管を流れる水を第１の方向に流す場合、第１三方弁の第１分岐管側を閉鎖し、第２三方弁の第２分岐管側を閉鎖し、第３三方弁の第３分岐管側を閉鎖し、第４三方弁の第３分岐管側を閉鎖する。また、第１三方弁の第３水熱交換器側を開放し、第２三方弁の第１水熱交換器及び第２水熱交換器側を開放し、第３三方弁の第１水熱交換器及び第２水熱交換器側を開放し、第４三方弁の第３水熱交換器側を開放する。これにより、水配管を流れる水が、第３三方弁を介して、第１水熱交換器と第２水熱交換器に供給されて、その後、合流する。次に、水は、第１三方弁及び第２三方弁を介して、第３水熱交換器に供給される。そして、第３水熱交換器から第４四方弁を介して、外部へ流出する。 According to this configuration, when the water flowing through the water pipe in the heat exchanger flows in the first direction, the first branch pipe side of the first three-way valve is closed, and the second branch pipe side of the second three-way valve is closed. Then, the third branch pipe side of the third three-way valve is closed, and the third branch pipe side of the fourth three-way valve is closed. Further, the third water heat exchanger side of the first three-way valve is opened, the first water heat exchanger side and the second water heat exchanger side of the second three-way valve are opened, and the first water heat exchanger side of the third three-way valve is opened. The exchanger and the second water heat exchanger side are opened, and the third water heat exchanger side of the fourth three-way valve is opened. Thereby, the water flowing through the water pipe is supplied to the first water heat exchanger and the second water heat exchanger via the third three-way valve, and then joins. Water is then supplied to the third water heat exchanger via the first three-way valve and the second three-way valve. Then, it flows out from the third water heat exchanger to the outside through the fourth four-way valve.

熱交換器において水配管を流れる水を第１の方向とは反対の第２の方向に流す場合、第１三方弁の第１分岐管側を開放し、第２三方弁の第２分岐管側を開放し、第３三方弁の第３分岐管側を開放し、第４三方弁の第３分岐管側を開放する。また、第１三方弁の第３水熱交換器側を閉鎖し、第２三方弁の第１水熱交換器及び第２水熱交換器側を閉鎖し、第３三方弁の第１水熱交換器及び第２水熱交換器側を閉鎖し、第４三方弁の第３水熱交換器側を閉鎖する。 When the water flowing through the water pipe in the heat exchanger flows in the second direction opposite to the first direction, the first branch pipe side of the first three-way valve is opened, and the second branch pipe side of the second three-way valve is opened. is opened, the third branch pipe side of the third three-way valve is opened, and the third branch pipe side of the fourth three-way valve is opened. Also, the third water heat exchanger side of the first three-way valve is closed, the first water heat exchanger side and the second water heat exchanger side of the second three-way valve are closed, and the first water heat exchanger side of the third three-way valve is closed. The exchanger and the second water heat exchanger side are closed, and the third water heat exchanger side of the fourth three-way valve is closed.

これにより、水配管を流れる水が、第１分岐管及び第１三方弁を介して、第１水熱交換器と第２水熱交換器に供給されて、その後、合流する。次に、水は、第３三方弁、第３分岐管及び第４三方弁を介して、第３水熱交換器に供給される。そして、第３水熱交換器から第３四方弁及び第２分岐管を介して、外部へ流出する。 Thereby, the water flowing through the water pipe is supplied to the first water heat exchanger and the second water heat exchanger via the first branch pipe and the first three-way valve, and then joins. Water is then supplied to the third water heat exchanger via the third three-way valve, the third branch pipe and the fourth three-way valve. Then, it flows out from the third water heat exchanger to the outside through the third four-way valve and the second branch pipe.

よって、三方弁を切り換えることによって、熱交換器に接続された水配管の流れ方向を変更することが可能である。したがって、冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、三方弁を切り換えることで、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることができる。 Therefore, by switching the three-way valve, it is possible to change the flow direction of the water pipe connected to the heat exchanger. Therefore, by switching the three-way valve according to the switching between the cooling operation and the heating operation of the refrigerating cycle system, the flow direction of the refrigerant in the refrigerating cycle system and the flow direction of the water pipe can always be counterflows.

この構成によれば、ユニット本体の外部に四方弁が設置されていることから、四方弁をユニット本体の内部に設置された水配管と接続されることによって、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることが可能な系統を構成することができる。ユニット本体の内部には、四方弁が設置されていないことから、ユニット本体は、水配管の流れ方向が切り換え不要な構成にも適用できる。 According to this configuration, since the four-way valve is installed outside the unit body, by connecting the four-way valve to the water pipe installed inside the unit body, the refrigerant in the refrigeration cycle system flows in the same direction. A system can be configured in which the flow direction of the water pipe can always be counterflow. Since a four-way valve is not installed inside the unit main body, the unit main body can also be applied to a configuration in which the flow direction of the water pipe does not need to be switched.

上記発明において、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統において、前記第１水熱交換器、前記第２水熱交換器、又は、前記第３水熱交換器の接続口よりも上流側又は下流側に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の温度を検出する温度検出部と、前記温度検出部によって検出された温度に基づいて、前記四方弁、又は、前記第１三方弁、前記第２三方弁、前記第３三方弁及び前記第４三方弁を切り換える制御部とを備えてもよい。 In the above invention, in the first refrigerating cycle system, the second refrigerating cycle system, or the third refrigerating cycle system, the first water heat exchanger, the second water heat exchanger, or the third water A temperature detector that is installed upstream or downstream of a connection port of a heat exchanger and that detects the temperature of the refrigerant flowing through the first refrigerating cycle system, the second refrigerating cycle system, or the third refrigerating cycle system. and a controller that switches the four-way valve, or the first three-way valve, the second three-way valve, the third three-way valve, and the fourth three-way valve based on the temperature detected by the temperature detection unit. may be provided.

この構成によれば、冷凍サイクル系統において、水熱交換器の接続口よりも上流側又は下流側に設置された温度検出部によって、冷凍サイクル系統を流れる冷媒の温度が検出され、検出された温度に基づいて、四方弁が切り換えられる。冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、水熱交換器の接続口よりも上流側又は下流側を流れる冷媒の温度が変更される。これにより、検出された冷媒の温度に応じて、四方弁が自動的に切り換えられて、冷凍サイクル系統の冷媒の流れ方向と水配管の流れ方向を常に対向流とすることができる。なお、第１三方弁、第２三方弁、第３三方弁及び第４三方弁が設けられる構成についても同様である。 According to this configuration, in the refrigeration cycle system, the temperature detection unit installed upstream or downstream of the connection port of the water heat exchanger detects the temperature of the refrigerant flowing through the refrigeration cycle system, and the detected temperature , the four-way valve is switched. The temperature of the refrigerant flowing upstream or downstream of the connection port of the water heat exchanger is changed according to the switching between the cooling operation and the heating operation of the refrigeration cycle system. As a result, the four-way valve is automatically switched according to the detected temperature of the refrigerant, so that the direction of flow of the refrigerant in the refrigeration cycle system and the direction of flow of the water pipe can always be counterflows. In addition, the same applies to the configuration in which the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve are provided.

上記発明において、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の圧力を検出する圧力検出部と、前記制御部は、前記圧力検出部によって検出された圧力に基づいて、前記四方弁、又は、前記第１三方弁、前記第２三方弁、前記第３三方弁及び前記第４三方弁の切り換えの成否を判断してもよい。 In the above invention, it is installed in the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system, and the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system. A pressure detection unit that detects the pressure of the refrigerant flowing through the cycle system, and the control unit detect the pressure detected by the pressure detection unit. The success or failure of the switching of the valve, the third three-way valve and the fourth three-way valve may be determined.

この構成によれば、冷凍サイクル系統に設置された圧力検出部によって、冷凍サイクル系統を流れる冷媒の圧力が検出され、検出された圧力に基づいて、四方弁の切り換えの成否が判断される。したがって、冷媒の温度が検出されることによって、四方弁が正しく切り換えられているか否かを判断できる。なお、第１三方弁、第２三方弁、第３三方弁及び第４三方弁が設けられる構成についても同様である。 According to this configuration, the pressure detector installed in the refrigeration cycle system detects the pressure of the refrigerant flowing through the refrigeration cycle system, and based on the detected pressure, it is determined whether the four-way valve has been switched successfully. Therefore, by detecting the temperature of the refrigerant, it can be determined whether the four-way valve is properly switched. In addition, the same applies to the configuration in which the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve are provided.

本発明によれば、冷凍サイクル系統における冷房運転と暖房運転の切り換えに関わらず、水熱交換器において効率良く熱交換を行うことできる。 According to the present invention, heat can be efficiently exchanged in the water heat exchanger regardless of switching between the cooling operation and the heating operation in the refrigeration cycle system.

本発明の第１実施形態に係るチラーユニットの概略構成を示す回路図である。It is a circuit diagram showing a schematic structure of a chiller unit concerning a 1st embodiment of the present invention. 本発明の第１実施形態に係るチラーユニットの水配管の構成を示す概略図であり、四方弁が第１モードに切り換えられた状態を示す。FIG. 4 is a schematic diagram showing the configuration of the water piping of the chiller unit according to the first embodiment of the present invention, showing a state in which the four-way valve is switched to the first mode; 本発明の第１実施形態に係るチラーユニットの水配管の構成を示す概略図であり、四方弁が第２モードに切り換えられた状態を示す。FIG. 4 is a schematic diagram showing the configuration of the water piping of the chiller unit according to the first embodiment of the present invention, showing a state in which the four-way valve is switched to the second mode; 本発明の第２実施形態に係るチラーユニットの水配管の構成を示す概略図であり、第１～第３水熱交換器において、水が第１の方向に流れる場合を示す。FIG. 4 is a schematic diagram showing the configuration of water piping of a chiller unit according to a second embodiment of the present invention, showing a case where water flows in the first direction in the first to third water heat exchangers. 本発明の第２実施形態に係るチラーユニットの水配管の構成を示す概略図であり、第１～第３水熱交換器において、水が第２の方向に流れる場合を示す。FIG. 4 is a schematic diagram showing the configuration of water piping of a chiller unit according to a second embodiment of the present invention, showing a case where water flows in the second direction in the first to third water heat exchangers.

以下に、本発明に係る実施形態について、図面を参照して説明する。
［第１実施形態］
以下、本発明の第１実施形態に係るチラーユニット１について説明する。図１は、本発明の第１実施形態に係るチラーユニット１の概略構成を示す回路図である。
このチラーユニット１は、４つの冷凍サイクル系統、すなわち、第１～第４冷凍サイクル系統Ｒ１，Ｒ２，Ｒ３，Ｒ４（以下「Ｒ１～Ｒ４」と示す。）と、水系統部３とが図示しない筐体の内部に収容された構成となっている。なお、本実施形態に係る水配管１８の構成は、図２及び図３で示しており、図１では、水配管１８の構成を簡略化して示している。 EMBODIMENT OF THE INVENTION Below, embodiment which concerns on this invention is described with reference to drawings.
[First embodiment]
A chiller unit 1 according to a first embodiment of the present invention will be described below. FIG. 1 is a circuit diagram showing a schematic configuration of a chiller unit 1 according to a first embodiment of the invention.
The chiller unit 1 has four refrigerating cycle systems, that is, first to fourth refrigerating cycle systems R1, R2, R3, and R4 (hereinafter referred to as "R1 to R4") and a water system section 3 (not shown). It is configured to be housed inside a housing. The configuration of the water pipe 18 according to this embodiment is shown in FIGS. 2 and 3, and the configuration of the water pipe 18 is shown in a simplified manner in FIG.

第１～第４冷凍サイクル系統Ｒ１～Ｒ４は、それぞれ、圧縮機５と、オイルセパレータ６と、逆止弁７と、四方弁８と、水熱交換器９（第１～第３水熱交換器９Ａ，９Ｂ，９Ｃ（以下「９Ａ～９Ｃ」と示す。））と、レシーバ１０と、電子膨張弁１１と、空冷熱交換器１２と、気液分離器１３とを備えている。空冷熱交換器１２には冷却ファン１２ａが設けられている。 The first to fourth refrigeration cycle systems R1 to R4 respectively include a compressor 5, an oil separator 6, a check valve 7, a four-way valve 8, and a water heat exchanger 9 (first to third water heat exchange 9A, 9B, 9C (hereinafter referred to as “9A to 9C”)), a receiver 10, an electronic expansion valve 11, an air-cooled heat exchanger 12, and a gas-liquid separator 13. The air-cooled heat exchanger 12 is provided with a cooling fan 12a.

圧縮機５は、ガス冷媒を吸入し、吸入したガス冷媒を圧縮して吐出する。オイルセパレータ６は、圧縮機５から吐出された圧縮冷媒中のオイルを分離して圧縮機５に還流させる。逆止弁７は、圧縮冷媒の逆流を防止する。 The compressor 5 sucks gas refrigerant, compresses the sucked gas refrigerant, and discharges it. The oil separator 6 separates oil from the compressed refrigerant discharged from the compressor 5 and returns it to the compressor 5 . The check valve 7 prevents backflow of the compressed refrigerant.

四方弁８は、圧縮機５から吐出された圧縮冷媒を水熱交換器９に送る暖房運転モードと、空冷熱交換器１２に送る冷房運転モードとの２つのポジションが選択される弁である。図１では、四方弁８が暖房運転モードのポジションとなっている。 The four-way valve 8 is a valve that selects two positions of a heating operation mode in which the compressed refrigerant discharged from the compressor 5 is sent to the water heat exchanger 9 and a cooling operation mode in which the compressed refrigerant is sent to the air-cooled heat exchanger 12 . In FIG. 1, the four-way valve 8 is in the heating operation mode position.

水熱交換器９は、暖房運転モードにおいて圧縮冷媒を凝縮させて凝縮器として機能し、冷房運転モードにおいて凝縮冷媒を気化させる蒸発器として機能する熱交換器である。そして、その凝縮熱又は気化熱により、後述するように水系統部３を流れる水を加熱又は冷却して暖房用の温水、給湯用の温水若しくは熱水、又は冷房用の冷水を生成する。 The water heat exchanger 9 is a heat exchanger that functions as a condenser by condensing the compressed refrigerant in the heating operation mode and as an evaporator that vaporizes the condensed refrigerant in the cooling operation mode. The heat of condensation or heat of vaporization heats or cools the water flowing through the water system 3 to generate hot water for heating, hot water or hot water for supplying hot water, or cold water for cooling.

第１冷凍サイクル系統Ｒ１は、第１水熱交換器９Ａを有し、第２冷凍サイクル系統Ｒ２は、第２水熱交換器９Ｂを有する。また、第３冷凍サイクル系統Ｒ３と第４冷凍サイクル系統Ｒ４は、第３水熱交換器９Ｃを共有する。すなわち、第３水熱交換器９Ｃは、２層構造となっており、第３冷凍サイクル系統Ｒ３の冷媒と第４冷凍サイクル系統Ｒ４の冷媒とが混合しないで通過するようになっている。 The first refrigeration cycle system R1 has a first water heat exchanger 9A, and the second refrigeration cycle system R2 has a second water heat exchanger 9B. Also, the third refrigerating cycle system R3 and the fourth refrigerating cycle system R4 share the third water heat exchanger 9C. That is, the third water heat exchanger 9C has a two-layer structure, and the refrigerant of the third refrigerating cycle system R3 and the refrigerant of the fourth refrigerating cycle system R4 pass through without being mixed.

チラーユニット１は、第１水熱交換器９Ａと第２水熱交換器９Ｂが水配管１８によって並列に接続され、第３水熱交換器９Ｃが第１，第２水熱交換器９Ａ，９Ｂに対して水配管１８によって直列に接続される。 In the chiller unit 1, a first water heat exchanger 9A and a second water heat exchanger 9B are connected in parallel by a water pipe 18, and a third water heat exchanger 9C is connected to the first and second water heat exchangers 9A and 9B. are connected in series by a water pipe 18 to the

第１水熱交換器９Ａ及び第２水熱交換器９Ｂのそれぞれの容量は、第３水熱交換器９Ｃの容量よりも小さく、例えば第３水熱交換器９Ｃの半分程度に設定されている。これにより、第１水熱交換器９Ａと第２水熱交換器９Ｂとを互いに離間させて配置することができる。このため、チラーユニット１（図示しない筐体）の内部における第１水熱交換器９Ａと第２水熱交換器９Ｂの配置レイアウトの自由度を高めることができる。また、第１水熱交換器９Ａと第２水熱交換器９Ｂと他の機材との相対設置間隔を大きくして清掃、検査、調整、交換等のメンテナンス作業性を向上させることができる。 The capacity of each of the first water heat exchanger 9A and the second water heat exchanger 9B is smaller than the capacity of the third water heat exchanger 9C, and is set to, for example, about half that of the third water heat exchanger 9C. . Thereby, the first water heat exchanger 9A and the second water heat exchanger 9B can be spaced apart from each other. Therefore, it is possible to increase the degree of freedom in layout layout of the first water heat exchanger 9A and the second water heat exchanger 9B inside the chiller unit 1 (housing not shown). Also, by increasing the relative installation interval between the first water heat exchanger 9A, the second water heat exchanger 9B, and other equipment, it is possible to improve maintenance workability such as cleaning, inspection, adjustment, and replacement.

レシーバ１０は、凝縮した液冷媒を所定量貯留するタンクである。電子膨張弁１１は、凝縮冷媒の圧力を低下させて気化を促進させる。空冷熱交換器１２は、冷却ファン１２ａによって外気が供給される。空冷熱交換器１２は、暖房運転モードにおいて凝縮冷媒を気化させる蒸発器として機能し、冷房運転モードにおいて圧縮冷媒を凝縮させる凝縮器として機能する熱交換器である。気液分離器１３は、圧縮機５に吸入される前の冷媒を気液分離してガス冷媒のみを圧縮機５に吸入させる。 The receiver 10 is a tank that stores a predetermined amount of condensed liquid refrigerant. The electronic expansion valve 11 lowers the pressure of the condensed refrigerant to promote vaporization. The air-cooled heat exchanger 12 is supplied with outside air by a cooling fan 12a. The air-cooled heat exchanger 12 is a heat exchanger that functions as an evaporator that evaporates the condensed refrigerant in the heating operation mode and functions as a condenser that condenses the compressed refrigerant in the cooling operation mode. The gas-liquid separator 13 separates the gas-liquid from the refrigerant before it is sucked into the compressor 5 and causes the compressor 5 to suck only the gas refrigerant.

水系統部３は、水入口部１５と、水ポンプ１６と、水出口部１７と、水配管１８とを具備して構成されている。水入口部１５から延びる水配管１８には、水ポンプ１６が設置される。 The water system section 3 includes a water inlet section 15 , a water pump 16 , a water outlet section 17 and a water pipe 18 . A water pump 16 is installed in a water pipe 18 extending from the water inlet portion 15 .

次に、図２及び図３を参照して、本実施形態に係る水配管１８の構成について説明する。
水配管１８は、例えば、水配管１８ａ～１８ｄによって構成される。水配管１８には、四方弁２０が一つ設置される。四方弁２０は、第１接続口２１、第２接続口２２、第３接続口２３及び第４接続口２４を有する。 Next, the configuration of the water pipe 18 according to this embodiment will be described with reference to FIGS. 2 and 3. FIG.
The water pipe 18 is composed of, for example, water pipes 18a to 18d. One four-way valve 20 is installed in the water pipe 18 . The four-way valve 20 has a first connection port 21 , a second connection port 22 , a third connection port 23 and a fourth connection port 24 .

四方弁２０は、第１モード又は第２モードに切り換え可能である構成を有する。第１モードでは、図２に示すように、第１接続口２１と第２接続口２２が流通可能となり、かつ、第３接続口２３と第４接続口２４が流通可能となる。第２モードでは、図３に示すように、第１接続口２１と第３接続口２３が流通可能となり、かつ、第２接続口２２と第４接続口２４が流通可能となる。 The four-way valve 20 has a configuration that can be switched between the first mode and the second mode. In the first mode, as shown in FIG. 2, the first connection port 21 and the second connection port 22 are allowed to flow, and the third connection port 23 and the fourth connection port 24 are allowed to flow. In the second mode, as shown in FIG. 3, the first connection port 21 and the third connection port 23 are allowed to flow, and the second connection port 22 and the fourth connection port 24 are allowed to flow.

第１，第２水熱交換器９Ａ，９Ｂ側において、水配管１８ａは、四方弁２０の第１接続口２１と接続され、第１接続口２１では、供給元から送られた水配管１８ａを流れる水が四方弁２０に常に流入する。第３水熱交換器９Ｃ側において、四方弁２０の第１接続口２１は、第１，第２水熱交換器９Ａ，９Ｂ側の水配管１８ｄと接続され、第１接続口２１では、第１，第２水熱交換器９Ａ，９Ｂ側から送られた水配管１８ｄを流れる水が四方弁２０に常に流入する。 On the first and second water heat exchangers 9A and 9B side, the water pipe 18a is connected to the first connection port 21 of the four-way valve 20, and the water pipe 18a sent from the supply source is connected to the first connection port 21. Flowing water always flows into the four-way valve 20 . On the side of the third water heat exchanger 9C, the first connection port 21 of the four-way valve 20 is connected to the water pipe 18d on the side of the first and second water heat exchangers 9A and 9B. 1. The water flowing through the water pipe 18d sent from the second water heat exchangers 9A and 9B always flows into the four-way valve 20.

水配管１８ｄは、四方弁２０の第４接続口２４と接続され、第４接続口２４では、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃを流通した水が四方弁２０から常に流出して、供給先へ送られる。 The water pipe 18d is connected to the fourth connection port 24 of the four-way valve 20. At the fourth connection port 24, the water flowing through the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C flows. It always flows out from the four-way valve 20 and is sent to the supply destination.

水配管１８ｂは、一端が四方弁２０の第２接続口２２と接続され、他端が第１，第２水熱交換器９Ａ，９Ｂの一端側の接続口、又は、第３水熱交換器９Ｃの一端側の接続口と接続される。第１，第２水熱交換器９Ａ，９Ｂ側において、水配管１８ｂは、途中で、第１，第２水熱交換器９Ａ，９Ｂ側とに分かれて設けられている。 One end of the water pipe 18b is connected to the second connection port 22 of the four-way valve 20, and the other end of the water pipe 18b is connected to one end side of the first and second water heat exchangers 9A and 9B or the third water heat exchanger. It is connected to the connection port on the one end side of 9C. On the side of the first and second water heat exchangers 9A, 9B, the water pipe 18b is provided to be separated on the side of the first and second water heat exchangers 9A, 9B.

四方弁２０が第１接続口２１と第２接続口２２が流通可能な第１モードであるとき、水配管１８ｂでは、四方弁２０の第２接続口２２から第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃへ水が送られる。四方弁２０が第２接続口２２と第４接続口２４が流通可能な第２モードであるとき、水配管１８ｂでは、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃから四方弁２０の第２接続口２２へ水が送られる。 When the four-way valve 20 is in the first mode in which the first connection port 21 and the second connection port 22 can flow, in the water pipe 18b, from the second connection port 22 of the four-way valve 20 to the first and second water heat exchangers Water is sent to 9A, 9B or the third water heat exchanger 9C. When the four-way valve 20 is in the second mode in which the second connection port 22 and the fourth connection port 24 can flow, in the water pipe 18b, the first and second water heat exchangers 9A and 9B or the third water heat exchanger Water is sent to the second connection port 22 of the four-way valve 20 from 9C.

水配管１８ｃは、一端が第３接続口２３と接続され、他端が第１，第２水熱交換器９Ａ，９Ｂの他端側の接続口、又は、第３水熱交換器９Ｃの他端側の接続口と接続される。第１，第２水熱交換器９Ａ，９Ｂ側において、水配管１８ｃは、途中で、第１，第２水熱交換器９Ａ，９Ｂ側とに分かれて設けられている。 One end of the water pipe 18c is connected to the third connection port 23, and the other end is the connection port on the other end side of the first and second water heat exchangers 9A and 9B, or the third water heat exchanger 9C. Connected to the connection port on the end side. On the side of the first and second water heat exchangers 9A, 9B, the water pipe 18c is provided to be separated on the side of the first and second water heat exchangers 9A, 9B.

四方弁２０が第３接続口２３と第４接続口２４が流通可能な第１モードであるとき、水配管１８ｃでは、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃから四方弁２０の第３接続口２３へ水が送られる。四方弁２０が第１接続口２１と第３接続口２３が流通可能な第２モードであるとき、水配管１８ｃでは、四方弁２０の第３接続口２３から第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃへ水が送られる。 When the four-way valve 20 is in the first mode in which the third connection port 23 and the fourth connection port 24 can flow, in the water pipe 18c, the first and second water heat exchangers 9A and 9B or the third water heat exchanger Water is sent to the third connection port 23 of the four-way valve 20 from 9C. When the four-way valve 20 is in the second mode in which the first connection port 21 and the third connection port 23 can flow, in the water pipe 18c, from the third connection port 23 of the four-way valve 20 to the first and second water heat exchangers Water is sent to 9A, 9B or the third water heat exchanger 9C.

四方弁２０が第１モードに切り換えられているとき、第１接続口２１において水配管１８ａを流れる水が流入し、第１接続口２１から第２接続口２２へ水が流れた後、第２接続口２２から第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃへ水が供給される。また、第１モードでは、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃを流れた水が第３接続口２３から流入し、第３接続口２３から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して供給先へ流出する。 When the four-way valve 20 is switched to the first mode, the water flowing through the water pipe 18a flows into the first connection port 21, and after the water flows from the first connection port 21 to the second connection port 22, the second Water is supplied from the connection port 22 to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C. Further, in the first mode, the water that has flowed through the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C flows from the third connection port 23, and flows from the third connection port 23 to the fourth connection. After the water flows to the port 24, the water flows out from the fourth connection port 24 to the supply destination through the water pipe 18d.

四方弁２０が第２モードに切り換えられているとき、第１接続口２１において水配管１８ａを流れる水が流入し、第１接続口２１から第３接続口２３へ水が流れた後、第３接続口２３から第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃへ水が供給される。また、第２モードでは、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃを流れた水が第２接続口２２から流入し、第２接続口２２から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して供給先へ流出する。 When the four-way valve 20 is switched to the second mode, the water flowing through the water pipe 18a flows into the first connection port 21, and after the water flows from the first connection port 21 to the third connection port 23, the third Water is supplied from the connection port 23 to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C. Further, in the second mode, the water that has flowed through the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C flows in from the second connection port 22, and flows from the second connection port 22 to the fourth connection. After the water flows to the port 24, the water flows out from the fourth connection port 24 to the supply destination through the water pipe 18d.

四方弁２０を切り換えることによって、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃに接続された水配管１８の水の流れ方向を変更することが可能である。したがって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、四方弁２０を切り換えることで、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることができる。また、四方弁２０の切り換えに関わらず、水配管１８には常に水が流れており、水が流れない系統が存在しない。したがって、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃに接続された水配管１８の水の流れ方向を変更する場合において、水の流れ方向を迅速に切り換え可能とし、また、不具合を生じにくくすることができる。 By switching the four-way valve 20, it is possible to change the water flow direction of the water pipe 18 connected to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C. Therefore, by switching the four-way valve 20 according to the switching between the cooling operation and the heating operation of the first to fourth refrigerating cycle systems R1 to R4, the flow direction of the refrigerant in the first to fourth refrigerating cycle systems R1 to R4 and The direction of water flow in the water pipe 18 can always be counterflow. In addition, regardless of switching of the four-way valve 20, water always flows through the water pipe 18, and there is no system in which water does not flow. Therefore, when changing the water flow direction of the water pipe 18 connected to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C, the water flow direction can be quickly switched. , In addition, it is possible to make it difficult to cause troubles.

また、第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃに対して、四方弁２０の設置個数は一つずつであり、三方弁を設置する場合の設置個数に比べて低減されるため、部品点数を減らすことができる。また、三方弁を設置する場合、複数の三方弁が動作する必要があるのに対して、一つの四方弁２０が動作すればよいため、動作ミスによる切り換えの不具合が生じにくい。 In addition, the number of four-way valves 20 installed is one for each of the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C, compared to the number of installations when a three-way valve is installed. can be reduced, the number of parts can be reduced. In addition, when a three-way valve is installed, a plurality of three-way valves need to be operated, whereas only one four-way valve 20 is required to operate.

四方弁２０は、チラーユニット１のユニット本体（筐体）の内部に設置される。この場合、ユニット本体の内部に四方弁２０が設置されていることから、水入口部１５と水出口部１７をそれぞれ外部の水配管と接続する。これにより、チラーユニット１を外部の水配管と接続するだけで、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることが可能な系統を構成することができる。 The four-way valve 20 is installed inside the unit main body (housing) of the chiller unit 1 . In this case, since the four-way valve 20 is installed inside the unit main body, the water inlet portion 15 and the water outlet portion 17 are connected to external water pipes. As a result, by simply connecting the chiller unit 1 to the external water pipe, the flow direction of the refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the flow direction of the water in the water pipe 18 can always be made to flow in opposite directions. A possible system can be constructed.

本実施形態において、四方弁２０は、ユニット本体の内部に設置される場合に限定されず、四方弁２０は、チラーユニット１のユニット本体（筐体）の外部に設置されてもよい。この場合、ユニット本体には、一端が外部の水配管と接続可能とされ、他端が第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃと接続された水配管１８ｂ、及び、一端が第１，第２水熱交換器９Ａ，９Ｂ又は第３水熱交換器９Ｃと接続され、他端が外部の水配管と接続可能とされた水配管１８ｃが設置されている。四方弁２０は、これらのユニット本体の内部に設置された水配管１８ｂ，１８ｃと接続され、かつ、上述した構成を有する水配管１８ａ，１８ｄを設置することによって、本実施形態に係るチラーユニット１が構成される。これにより、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることが可能な系統を構成することができる。ユニット本体の内部には、四方弁２０が設置されていないことから、ユニット本体は、水配管１８の水の流れ方向が切り換え不要な構成にも適用できる。 In the present embodiment, the four-way valve 20 is not limited to being installed inside the unit main body, and the four-way valve 20 may be installed outside the unit main body (housing) of the chiller unit 1 . In this case, the unit main body has a water pipe 18b having one end connectable to an external water pipe and the other end connected to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C. , and a water pipe 18c having one end connected to the first and second water heat exchangers 9A, 9B or the third water heat exchanger 9C and the other end connectable to an external water pipe is installed. . The four-way valve 20 is connected to the water pipes 18b and 18c installed inside these unit bodies, and by installing the water pipes 18a and 18d having the above-described configuration, the chiller unit 1 according to the present embodiment is configured. As a result, it is possible to construct a system in which the direction of flow of refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the direction of flow of water in the water pipe 18 are always countercurrent. Since the four-way valve 20 is not installed inside the unit main body, the unit main body can be applied to a configuration in which the direction of water flow in the water pipe 18 does not need to be switched.

本実施形態に係るチラーユニット１は、図１に示すように、温度検出部３１と、圧力検出部３２と、制御部３３を備えてもよい。 The chiller unit 1 according to this embodiment may include a temperature detector 31, a pressure detector 32, and a controller 33, as shown in FIG.

温度検出部３１は、第１～第４冷凍サイクル系統Ｒ１～Ｒ４において、第１～第３水熱交換器９Ａ～９Ｃの接続口よりも上流側及び／又は下流側に設置され、第１～第４冷凍サイクル系統Ｒ１～Ｒ４を流れる冷媒の温度を検出する。 The temperature detection unit 31 is installed upstream and/or downstream of the connection ports of the first to third water heat exchangers 9A to 9C in the first to fourth refrigeration cycle systems R1 to R4. The temperature of the refrigerant flowing through the fourth refrigeration cycle system R1-R4 is detected.

圧力検出部３２は、第１～第４冷凍サイクル系統Ｒ１～Ｒ４において、圧縮機５の吸い込み側及び吐き出し側にそれぞれ設置され、第１～第４冷凍サイクル系統Ｒ１～Ｒ４を流れる冷媒の圧力を検出する。 The pressure detection unit 32 is installed on the suction side and the discharge side of the compressor 5 in the first to fourth refrigeration cycle systems R1 to R4, respectively, and detects the pressure of the refrigerant flowing through the first to fourth refrigeration cycle systems R1 to R4. To detect.

制御部３３は、温度検出部３１によって検出された温度に基づいて、四方弁２０を切り換える。第１～第３水熱交換器９Ａ～９Ｃに流入する冷媒、又は、第１～第３水熱交換器９Ａ～９Ｃから流出する冷媒の温度に基づいて、第１～第４冷凍サイクル系統Ｒ１～Ｒ４が冷房運転であるか又は暖房運転であるかを判断する。 The controller 33 switches the four-way valve 20 based on the temperature detected by the temperature detector 31 . Based on the temperature of the refrigerant flowing into the first to third water heat exchangers 9A to 9C, or the temperature of the refrigerant flowing out of the first to third water heat exchangers 9A to 9C, the first to fourth refrigeration cycle system R1 ~ Judge whether R4 is in cooling operation or heating operation.

冷房運転時、第１～第３水熱交換器９Ａ～９Ｃは、蒸発器として機能することから、検出された温度が所定の閾値よりも低い場合、冷房運転であると判断でき、四方弁２０を冷房運転に対応したモードに切り換える。暖房運転時、第１～第３水熱交換器９Ａ～９Ｃは、凝縮器として機能することから、検出された温度が所定の閾値よりも高い場合、暖房運転であると判断でき、四方弁２０を暖房運転に対応したモードに切り換える。これにより、冷房運転と暖房運転の双方において、第１～第３水熱交換器９Ａ～９Ｃでは、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向が対向流とされる。 During cooling operation, the first to third water heat exchangers 9A to 9C function as evaporators, so if the detected temperature is lower than a predetermined threshold, it can be determined that the four-way valve 20 is in cooling operation. switch to a mode corresponding to cooling operation. During heating operation, the first to third water heat exchangers 9A to 9C function as condensers, so when the detected temperature is higher than a predetermined threshold, it can be determined that the four-way valve 20 is in heating operation. to a mode corresponding to heating operation. As a result, in both the cooling operation and the heating operation, in the first to third water heat exchangers 9A to 9C, the flow direction of the refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the flow of water in the water pipe 18 The direction is counter-flow.

また、制御部３３は、圧力検出部３２によって検出された圧力に基づいて、四方弁２０の切り換えの成否を判断する。四方弁２０が正しく切り換わっていない場合、第１～第３水熱交換器９Ａ～９Ｃでは、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向が並行流となるため、第１～第３水熱交換器９Ａ～９Ｃにおける熱交換効率が低下する。したがって、例えば、圧力検出部３２が圧縮機５に吸い込まれる冷媒の圧力と圧縮機５から吐出される冷媒の圧力を検出し、圧力差が所定の閾値よりも低下したとき、四方弁２０が正しく切り換わっていないと判断する。他方、圧力差が所定の閾値を超えていれば、四方弁２０が正しく切り換わっていると判断する。 Also, the control unit 33 determines whether the switching of the four-way valve 20 has succeeded or failed based on the pressure detected by the pressure detection unit 32 . If the four-way valve 20 is not properly switched, in the first to third water heat exchangers 9A to 9C, the direction of refrigerant flow in the first to fourth refrigeration cycle systems R1 to R4 and the direction of water flow in the water pipe 18 flow in parallel, the heat exchange efficiency in the first to third water heat exchangers 9A to 9C is lowered. Therefore, for example, the pressure detection unit 32 detects the pressure of the refrigerant sucked into the compressor 5 and the pressure of the refrigerant discharged from the compressor 5, and when the pressure difference falls below a predetermined threshold value, the four-way valve 20 is properly operated. It is judged that it is not switched. On the other hand, if the pressure difference exceeds the predetermined threshold value, it is determined that the four-way valve 20 is properly switched.

制御部３３は、例えば、ＣＰＵ（Central Processing Unit）、ＲＡＭ（Random Access Memory）、ＲＯＭ（Read Only Memory）、及びコンピュータ読み取り可能な記憶媒体等から構成されている。そして、各種機能を実現するための一連の処理は、一例として、プログラムの形式で記憶媒体等に記憶されており、このプログラムをＣＰＵがＲＡＭ等に読み出して、情報の加工・演算処理を実行することにより、各種機能が実現される。なお、プログラムは、ＲＯＭやその他の記憶媒体に予めインストールしておく形態や、コンピュータ読み取り可能な記憶媒体に記憶された状態で提供される形態、有線又は無線による通信手段を介して配信される形態等が適用されてもよい。コンピュータ読み取り可能な記憶媒体とは、磁気ディスク、光磁気ディスク、ＣＤ－ＲＯＭ、ＤＶＤ－ＲＯＭ、半導体メモリ等である。 The control unit 33 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, for example, and the CPU reads out this program to a RAM or the like, and executes information processing and arithmetic processing. As a result, various functions are realized. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or delivered via wired or wireless communication means. etc. may be applied. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.

本実施形態によれば、第１～第４冷凍サイクル系統Ｒ１～Ｒ４において、第１～第３水熱交換器９Ａ～９Ｃの接続口よりも上流側又は下流側に設置された温度検出部３１によって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４を流れる冷媒の温度が検出され、検出された温度に基づいて、四方弁２０が切り換えられる。第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、第１～第３水熱交換器９Ａ～９Ｃの接続口よりも上流側や下流側を流れる冷媒の温度が変更される。したがって、検出された冷媒の温度に応じて、四方弁２０が自動的に切り換えられることによって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることができる。 According to the present embodiment, in the first to fourth refrigeration cycle systems R1 to R4, the temperature detection unit 31 installed upstream or downstream of the connection ports of the first to third water heat exchangers 9A to 9C , the temperature of the refrigerant flowing through the first to fourth refrigeration cycle systems R1 to R4 is detected, and the four-way valve 20 is switched based on the detected temperature. The temperature of the refrigerant flowing upstream or downstream of the connection port of the first to third water heat exchangers 9A to 9C according to the switching between the cooling operation and the heating operation of the first to fourth refrigeration cycle systems R1 to R4 is changed. Therefore, by automatically switching the four-way valve 20 according to the detected temperature of the refrigerant, the flow direction of the refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the flow direction of the water in the water pipe 18 are changed. Counterflow can always be used.

また、第１～第４冷凍サイクル系統Ｒ１～Ｒ４に設置された圧力検出部３２によって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４を流れる冷媒の圧力が検出され、検出された圧力に基づいて、四方弁２０の切り換えの成否が判断される。したがって、四方弁２０が自動的に切り換えられた場合において、四方弁２０が正しく切り換えられているか否かを判断できる。 Further, the pressure of the refrigerant flowing through the first to fourth refrigeration cycle systems R1 to R4 is detected by the pressure detection units 32 installed in the first to fourth refrigeration cycle systems R1 to R4, and based on the detected pressure, , the success or failure of the switching of the four-way valve 20 is determined. Therefore, when the four-way valve 20 is automatically switched, it can be determined whether the four-way valve 20 is correctly switched.

以上のように構成されたチラーユニット１は、以下のように作動する。以下では、暖房運転時において、四方弁２０が図２に示す第１モードに切り替わり、冷房運転時において、四方弁２０が図３に示す第２モードに切り替わる例について説明する。 The chiller unit 1 configured as described above operates as follows. An example in which the four-way valve 20 switches to the first mode shown in FIG. 2 during heating operation and switches to the second mode shown in FIG. 3 during cooling operation will be described below.

まず、暖房運転時における動作について説明する。
暖房運転時には、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の四方弁８が、図１に示す暖房運転モードのポジションになる。 First, the operation during heating operation will be described.
During heating operation, the four-way valves 8 of the first to fourth refrigeration cycle systems R1 to R4 are in the heating operation mode positions shown in FIG.

そして、少なくとも１つの圧縮機５が作動する。圧縮機５により圧縮された高温高圧の圧縮冷媒は、オイルセパレータ６にてオイル分が分離され、四方弁８を経て第１～第３水熱交換器９Ａ～９Ｃのいずれか、又は、全てに流れる。このとき、圧縮冷媒は、水系統部３の水配管１８を流れる水と熱交換される。また、温度検出部３１によって温度が検出されて、四方弁２０が第１モードに切り替わる。 At least one compressor 5 is then activated. The high-temperature and high-pressure compressed refrigerant compressed by the compressor 5 is separated from the oil by the oil separator 6, and passes through the four-way valve 8 to any or all of the first to third water heat exchangers 9A to 9C. flow. At this time, the compressed refrigerant is heat-exchanged with the water flowing through the water pipe 18 of the water system section 3 . Also, the temperature is detected by the temperature detection unit 31, and the four-way valve 20 is switched to the first mode.

すなわち、第１冷凍サイクル系統Ｒ１の圧縮機５により圧縮された圧縮冷媒は第１水熱交換器９Ａに流れて水配管１８を流れる水と熱交換され、第２冷凍サイクル系統Ｒ２の圧縮機５により圧縮された圧縮冷媒は第２水熱交換器９Ｂに流れて水配管１８を流れる水と熱交換される。また、第３冷凍サイクル系統Ｒ３と第４冷凍サイクル系統Ｒ４の圧縮機５により圧縮された圧縮冷媒は第３水熱交換器９Ｃに流れて水配管１８を流れる水と熱交換される。 That is, the compressed refrigerant compressed by the compressor 5 of the first refrigerating cycle system R1 flows into the first water heat exchanger 9A and is heat-exchanged with the water flowing through the water pipe 18, and the compressor 5 of the second refrigerating cycle system R2 The compressed refrigerant flows into the second water heat exchanger 9B and is heat-exchanged with the water flowing through the water pipe 18 . Also, the compressed refrigerant compressed by the compressors 5 of the third refrigerating cycle system R3 and the fourth refrigerating cycle system R4 flows into the third water heat exchanger 9C and exchanges heat with the water flowing through the water pipe 18 .

つまり、第１冷凍サイクル系統Ｒ１と第２冷凍サイクル系統Ｒ２においては、それぞれ第１水熱交換器９Ａと第２水熱交換器９Ｂとによって冷媒と水との熱交換が個別に行われ、第３冷凍サイクル系統Ｒ３と第４冷凍サイクル系統Ｒ４においては、第３水熱交換器９Ｃを共有しながら冷媒と水との熱交換が行われる。このように第１～第３水熱交換器９Ａ～９Ｃにて高温な圧縮冷媒と熱交換した水は温水又は熱水となり、水出口部１７から所定の暖房箇所又は給湯箇所に供給される。 That is, in the first refrigerating cycle system R1 and the second refrigerating cycle system R2, heat exchange between the refrigerant and water is performed individually by the first water heat exchanger 9A and the second water heat exchanger 9B, respectively. In the third refrigerating cycle system R3 and the fourth refrigerating cycle system R4, heat exchange between the refrigerant and water is performed while sharing the third water heat exchanger 9C. The water thus heat-exchanged with the high-temperature compressed refrigerant in the first to third water heat exchangers 9A to 9C becomes hot water or hot water, and is supplied from the water outlet 17 to a predetermined heating location or hot water supply location.

四方弁２０が第１モードに切り替わることにより、第１接続口２１において水配管１８ａを流れる水が流入し、第１接続口２１から第２接続口２２へ水が流れた後、第１，第２水熱交換器９Ａ，９Ｂへ水が供給される。また、第１モードでは、第１水熱交換器９Ａと第２水熱交換器９Ｂに並列に水が流れ、第１，第２水熱交換器９Ａ，９Ｂを流れた水が第３接続口２３から流入し、第３接続口２３から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して第３水熱交換器９Ｃへ流出する。そして、第１，第２水熱交換器９Ａ，９Ｂでは、第１，第２冷凍サイクル系統Ｒ１，Ｒ２の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 By switching the four-way valve 20 to the first mode, the water flowing through the water pipe 18a flows into the first connection port 21, and after the water flows from the first connection port 21 to the second connection port 22, the first and second Water is supplied to the two water heat exchangers 9A and 9B. Further, in the first mode, water flows in parallel to the first water heat exchanger 9A and the second water heat exchanger 9B, and the water flowing through the first and second water heat exchangers 9A and 9B flows through the third connection port. 23, and after flowing from the third connection port 23 to the fourth connection port 24, the water flows out from the fourth connection port 24 to the third water heat exchanger 9C through the water pipe 18d. In the first and second water heat exchangers 9A and 9B, the direction of flow of the refrigerant in the first and second refrigeration cycle systems R1 and R2 and the direction of flow of water in the water pipe 18 are countercurrent.

第３水熱交換器９Ｃでは、四方弁２０が第１モードに切り替わることにより、第１接続口２１において、第１，第２水熱交換器９Ａ，９Ｂからの水が流入し、第１接続口２１から第２接続口２２へ水が流れた後、第２接続口２２から第３水熱交換器９Ｃへ水が供給される。また、第１モードでは、第３水熱交換器９Ｃを流れた水が第３接続口２３から流入し、第３接続口２３から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して外部へ流出する。そして、第３水熱交換器９Ｃでは、第３，第４冷凍サイクル系統Ｒ３，Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 In the third water heat exchanger 9C, by switching the four-way valve 20 to the first mode, the water from the first and second water heat exchangers 9A and 9B flows into the first connection port 21, and the first connection After the water flows from the port 21 to the second connection port 22, water is supplied from the second connection port 22 to the third water heat exchanger 9C. Further, in the first mode, the water flowing through the third water heat exchanger 9C flows from the third connection port 23, and after the water flows from the third connection port 23 to the fourth connection port 24, the fourth connection port 24, water flows out through the water pipe 18d. In the third water heat exchanger 9C, the flow direction of the refrigerant in the third and fourth refrigeration cycle systems R3 and R4 and the flow direction of water in the water pipe 18 are countercurrent.

また、第１～第３水熱交換器９Ａ～９Ｃで水と熱交換した圧縮冷媒は凝縮して液化し、レシーバ１０を経て電子膨張弁１１を通過し、ここで圧力を低下されて空冷熱交換器１２に流れ、空気と熱交換することにより気化してガス冷媒となり、四方弁８と気液分離器１３と経て再び圧縮機５に吸入される。 In addition, the compressed refrigerant that has exchanged heat with water in the first to third water heat exchangers 9A to 9C is condensed and liquefied, passes through the receiver 10 and the electronic expansion valve 11, where the pressure is reduced and air-cooled heat It flows through the exchanger 12 and exchanges heat with the air to be vaporized into a gaseous refrigerant.

次に、冷房運転時における動作について説明する。
冷房運転時には、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の四方弁８が図１に示す方向から変更されて冷房運転モードのポジションになる。したがって、圧縮機５により圧縮された高温高圧の圧縮冷媒は四方弁８を経て空冷熱交換器１２に流れ、冷却ファン１２ａによって外気が供給されることにより空気と熱交換して凝縮して液化する。生成された凝縮冷媒は、レシーバ１０を経て第１～第３水熱交換器９Ａ～９Ｃのいずれか、又は、全てに流れる。このとき、凝縮冷媒は、水系統部３の水配管１８を流れる水と熱交換して気化する。また、温度検出部３１によって温度が検出されて、四方弁２０が第２モードに切り替わる。 Next, the operation during cooling operation will be described.
During the cooling operation, the four-way valves 8 of the first to fourth refrigeration cycle systems R1 to R4 are changed from the direction shown in FIG. 1 to the cooling operation mode position. Therefore, the high-temperature and high-pressure compressed refrigerant compressed by the compressor 5 flows through the four-way valve 8 to the air-cooled heat exchanger 12, where it is supplied with outside air by the cooling fan 12a, exchanges heat with the air, condenses, and liquefies. . The produced condensed refrigerant flows through the receiver 10 to any one or all of the first to third water heat exchangers 9A to 9C. At this time, the condensed refrigerant exchanges heat with the water flowing through the water pipe 18 of the water system section 3 and evaporates. Also, the temperature is detected by the temperature detection unit 31, and the four-way valve 20 is switched to the second mode.

このように、第１～第３水熱交換器９Ａ～９Ｃにて低温な冷媒と熱交換した水は冷水となり、水出口部１７から所定の冷房箇所に供給される。 In this way, the water heat-exchanged with the low-temperature refrigerant in the first to third water heat exchangers 9A to 9C becomes cold water and is supplied from the water outlet 17 to a predetermined cooling location.

四方弁２０が第２モードに切り替わることにより、第１接続口２１において水配管１８ａを流れる水が流入し、第１接続口２１から第３接続口２３へ水が流れた後、第３接続口２３から第１，第２水熱交換器９Ａ，９Ｂへ水が供給される。また、第２モードでは、第１水熱交換器９Ａと第２水熱交換器９Ｂに並列に水が流れ、第１，第２水熱交換器９Ａ，９Ｂを流れた水が第２接続口２２から流入し、第２接続口２２から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して第３水熱交換器９Ｃへ流出する。そして、第１，第２水熱交換器９Ａ，９Ｂでは、第１，第２冷凍サイクル系統Ｒ１，Ｒ２の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 By switching the four-way valve 20 to the second mode, the water flowing through the water pipe 18a flows into the first connection port 21, and after the water flows from the first connection port 21 to the third connection port 23, the third connection port Water is supplied from 23 to the first and second water heat exchangers 9A and 9B. In the second mode, water flows in parallel to the first water heat exchanger 9A and the second water heat exchanger 9B, and the water flowing through the first and second water heat exchangers 9A and 9B flows into the second connection port. 22, and after flowing from the second connection port 22 to the fourth connection port 24, the water flows out from the fourth connection port 24 through the water pipe 18d to the third water heat exchanger 9C. In the first and second water heat exchangers 9A and 9B, the direction of flow of the refrigerant in the first and second refrigeration cycle systems R1 and R2 and the direction of flow of water in the water pipe 18 are countercurrent.

第３水熱交換器９Ｃでは、四方弁２０が第２モードに切り替わることにより、第１接続口２１において第１，第２水熱交換器９Ａ，９Ｂからの水が流入し、第１接続口２１から第３接続口２３へ水が流れた後、第３接続口２３から第３水熱交換器９Ｃへ水が供給される。また、第２モードでは、第３水熱交換器９Ｃを流れた水が第２接続口２２から流入し、第２接続口２２から第４接続口２４へ水が流れた後、第４接続口２４から水が水配管１８ｄを介して外部へ流出する。そして、第３水熱交換器９Ｃでは、第３冷凍サイクル系統Ｒ３の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 In the third water heat exchanger 9C, by switching the four-way valve 20 to the second mode, the water from the first and second water heat exchangers 9A and 9B flows into the first connection port 21, and the first connection port After the water flows from 21 to the third connection port 23, water is supplied from the third connection port 23 to the third water heat exchanger 9C. Further, in the second mode, the water flowing through the third water heat exchanger 9C flows in from the second connection port 22, and after the water flows from the second connection port 22 to the fourth connection port 24, the fourth connection port 24, water flows out through the water pipe 18d. In the third water heat exchanger 9C, the direction of flow of the refrigerant in the third refrigerating cycle system R3 and the direction of flow of water in the water pipe 18 are countercurrent.

また、第１～第３水熱交換器９Ａ～９Ｃで水と熱交換して気化したガス冷媒は、四方弁８と気液分離器１３と経て再び圧縮機５に吸入される。 Also, the gaseous refrigerant that has been vaporized by exchanging heat with water in the first to third water heat exchangers 9A to 9C is sucked into the compressor 5 again through the four-way valve 8 and the gas-liquid separator 13 .

以上説明したように、本実施形態に係るチラーユニット１は、第１水熱交換器９Ａを有する第１冷凍サイクル系統Ｒ１と、第２水熱交換器９Ｂを有する第２冷凍サイクル系統Ｒ２と、第３水熱交換器９Ｃを共有する第３冷凍サイクル系統Ｒ３及び第４冷凍サイクル系統Ｒ４とを備えている。そして、第１水熱交換器９Ａと第２水熱交換器９Ｂは水系統部３の水配管１８により並列に接続され、第３水熱交換器９Ｃは第１水熱交換器９Ａ及び第２水熱交換器９Ｂに対して水配管１８により直列に接続されている。 As described above, the chiller unit 1 according to the present embodiment includes the first refrigeration cycle system R1 having the first water heat exchanger 9A, the second refrigeration cycle system R2 having the second water heat exchanger 9B, It has a third refrigerating cycle system R3 and a fourth refrigerating cycle system R4 that share the third water heat exchanger 9C. The first water heat exchanger 9A and the second water heat exchanger 9B are connected in parallel by the water pipe 18 of the water system section 3, and the third water heat exchanger 9C connects the first water heat exchanger 9A and the second water heat exchanger 9A. It is connected in series by a water pipe 18 to the water heat exchanger 9B.

このように、第１水熱交換器９Ａと第２水熱交換器９Ｂとが水配管１８によって並列に接続されているため、第１水熱交換器９Ａと第２水熱交換器９Ｂとにおいて第１冷凍サイクル系統Ｒ１と第２冷凍サイクル系統Ｒ２の冷媒を均等に水と熱交換させ、冷媒と水とを効率良く熱交換させることができる。 Thus, since the first water heat exchanger 9A and the second water heat exchanger 9B are connected in parallel by the water pipe 18, the first water heat exchanger 9A and the second water heat exchanger 9B The refrigerant in the first refrigerating cycle system R1 and the second refrigerating cycle system R2 can be evenly heat-exchanged with water, and the refrigerant and water can be efficiently heat-exchanged.

さらに、第１～第３水熱交換器９Ａ～９Ｃで熱交換される水は、第１水熱交換器９Ａ及び第２水熱交換器９Ｂ側から流入し、第３水熱交換器９Ｃ側から流出する構成となっている。本構成とすれば、水の圧力が高い水入口部１５側（水ポンプ１６側）の方に第１水熱交換器９Ａと第２水熱交換器９Ｂの２基の水熱交換器９が設けられる態様となるため、第１，第２水熱交換器９Ａ，９Ｂにおける水の偏流を抑制して冷媒と水とを効率良く熱交換させることができる。 Furthermore, the water heat-exchanged in the first to third water heat exchangers 9A to 9C flows in from the first water heat exchanger 9A and the second water heat exchanger 9B side, the third water heat exchanger 9C side It is configured to flow out from With this configuration, two water heat exchangers 9, the first water heat exchanger 9A and the second water heat exchanger 9B, are provided on the water inlet portion 15 side (water pump 16 side) where the water pressure is high. Since it becomes the aspect provided, the drift of the water in 1st, 2nd water heat exchangers 9A and 9B can be suppressed, and a refrigerant|coolant and water can be heat-exchanged efficiently.

チラーユニット１は、低負荷運転時には、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の全てを稼働させなくてもよい。このとき、チラーユニット１は、第３冷凍サイクル系統Ｒ３又は第４冷凍サイクル系統Ｒ４を優先的に稼働させるとよい。 The chiller unit 1 does not have to operate all of the first to fourth refrigeration cycle systems R1 to R4 during low load operation. At this time, the chiller unit 1 preferably operates the third refrigerating cycle system R3 or the fourth refrigerating cycle system R4 preferentially.

例えば、第１冷凍サイクル系統Ｒ１と第２冷凍サイクル系統Ｒ２の一方のみを稼働させた場合には、水の流れに対して並列に設けられた第１水熱交換器９Ａと第２水熱交換器９Ｂの一方においてのみ熱交換が行われる。このため、他方の水熱交換器においては水が冷媒と熱交換されることなく通過し、一方の水熱交換器において熱交換された水と混合されてしまい、熱交換効率が低下してしまう。 For example, when only one of the first refrigerating cycle system R1 and the second refrigerating cycle system R2 is operated, the first water heat exchanger 9A and the second water heat exchanger provided in parallel with respect to the flow of water Heat exchange takes place only in one of the vessels 9B. Therefore, the water passes through the other water heat exchanger without being heat-exchanged with the refrigerant, and is mixed with the water heat-exchanged in the one water heat exchanger, resulting in a decrease in heat exchange efficiency. .

これに対し、第３冷凍サイクル系統Ｒ３又は第４冷凍サイクル系統Ｒ４を優先的に稼働させる構成とすれば、水の流れに対して直列に設けられた第３水熱交換器９Ｃにおいてのみ冷媒と水との熱交換が行われ、このように熱交換された水に熱交換されない水が混合されることがない。このため、冷媒と水とを効率良く熱交換させることができる。 On the other hand, if the configuration is such that the third refrigeration cycle system R3 or the fourth refrigeration cycle system R4 is preferentially operated, only the third water heat exchanger 9C provided in series with respect to the flow of water is used as the refrigerant. Heat exchange with water takes place, and water that has not been heat exchanged is not mixed with the water thus heat exchanged. Therefore, heat exchange between the refrigerant and the water can be efficiently performed.

なお、図示しないが、水配管１８に開閉弁や流量調整弁等の弁装置を設けることにより、第１水熱交換器９Ａと第２水熱交換器９Ｂに選択的に水を流せるようにしてもよい。 Although not shown, the water pipe 18 is provided with a valve device such as an on-off valve or a flow control valve so that water can be selectively flowed to the first water heat exchanger 9A and the second water heat exchanger 9B. good too.

以上説明したように、本実施形態に係るチラーユニット１によれば、冷媒と水とを効率良く熱交換させるとともに、チラーユニット１の内部における水熱交換器９の配置レイアウトの自由度を高め、併せて水熱交換器９の周りのメンテナンス性を向上させることができる。 As described above, according to the chiller unit 1 according to the present embodiment, the refrigerant and water are efficiently heat-exchanged, and the degree of freedom in the layout layout of the water heat exchanger 9 inside the chiller unit 1 is increased. In addition, the maintainability around the water heat exchanger 9 can be improved.

上述した実施形態では、四方弁２０と水配管１８が、第１水熱交換器９Ａ及び第２水熱交換器９Ｂに１組、第３水熱交換器９Ｃに１組設置される。 In the embodiment described above, one set of the four-way valve 20 and the water pipe 18 is installed in the first water heat exchanger 9A and the second water heat exchanger 9B, and one set is installed in the third water heat exchanger 9C.

各四方弁２０を切り換えることによって、第１，第２水熱交換器９Ａ，９Ｂに接続された水配管１８の水の流れ方向と、第３水熱交換器９Ｃに接続された水配管１８の水の流れ方向を変更することが可能である。したがって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、各四方弁２０を切り換えることで、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることができる。また、図２及び図３に示すように、第１，第２水熱交換器９Ａ，９Ｂの組と、第３水熱交換器９Ｃが直列に配置されている場合において、第１，第２水熱交換器９Ａ，９Ｂの組のほうが第３水熱交換器９Ｃよりも常に先に水が流れる構成とすることができる。 By switching each four-way valve 20, the water flow direction of the water pipes 18 connected to the first and second water heat exchangers 9A and 9B and the water flow direction of the water pipes 18 connected to the third water heat exchanger 9C It is possible to change the direction of water flow. Therefore, by switching the four-way valves 20 according to the switching between the cooling operation and the heating operation of the first to fourth refrigeration cycle systems R1 to R4, the flow direction of the refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the water pipe 18 can always flow in the opposite direction. Further, as shown in FIGS. 2 and 3, when the set of the first and second water heat exchangers 9A and 9B and the third water heat exchanger 9C are arranged in series, the first and second A set of water heat exchangers 9A and 9B can be configured such that water always flows earlier than the third water heat exchanger 9C.

［第２実施形態］
次に、図４及び図５を参照して、本発明の第２実施形態に係るチラーユニット１について説明する。なお、チラーユニット１における第１～第４冷凍サイクル系統Ｒ１～Ｒ４の構成は上述した実施形態と同一である。その他、上述した実施形態と重複する構成及び作用効果については説明を省略する。 [Second embodiment]
Next, a chiller unit 1 according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. The configuration of the first to fourth refrigerating cycle systems R1 to R4 in the chiller unit 1 is the same as that of the embodiment described above. In addition, descriptions of configurations and effects that overlap with those of the above-described embodiment will be omitted.

上述した第１実施形態では、四方弁２０が設置され、四方弁２０を切り換えることによって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、冷媒の流れ方向と水の流れ方向が向かい合う対向流となるように水配管１８が構成されている例について説明したが、本発明はこの例に限定されない。 In the above-described first embodiment, the four-way valve 20 is installed, and by switching the four-way valve 20, the flow direction of the refrigerant is changed according to the switching between the cooling operation and the heating operation of the first to fourth refrigeration cycle systems R1 to R4. Although the example in which the water pipe 18 is configured so that the water flow direction is opposite to that of the water pipe 18 has been described, the present invention is not limited to this example.

本実施形態では、第１～第４三方弁４１～４４と、第１～第４三方弁４１～４４から分岐した第１～第３分岐管１９ａ～１９ｃとが設置され、第１～第４三方弁４１～４４を切り替えることによって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、冷媒の流れ方向と水の流れ方向が向かい合う対向流となるように水系統部３の水配管１８が構成されている。 In this embodiment, first to fourth three-way valves 41 to 44 and first to third branch pipes 19a to 19c branched from the first to fourth three-way valves 41 to 44 are installed. By switching the three-way valves 41 to 44, the flow direction of the refrigerant and the flow direction of the water are made to flow in opposite directions according to the switching between the cooling operation and the heating operation of the first to fourth refrigeration cycle systems R1 to R4. A water pipe 18 of the water system unit 3 is configured.

第１三方弁４１は、水配管１８において、第１，第２水熱交換器９Ａ，９Ｂと第３水熱交換器９Ｃの間に設置される。第２三方弁４２は、水配管１８において、第１，第２水熱交換器９Ａ，９Ｂと第３水熱交換器９Ｃの間において、第１三方弁４１よりも第３水熱交換器９Ｃ側に設置される。第３三方弁４３は、水配管１８と第１分岐管１９ａの接続部分と、第１，第２水熱交換器９Ａ，９Ｂの間に設置される。第４三方弁４４は、第３水熱交換器９Ｃと水配管１８の第２分岐管１９ｂの接続部分の間に設置される。 The first three-way valve 41 is installed in the water pipe 18 between the first and second water heat exchangers 9A, 9B and the third water heat exchanger 9C. The second three-way valve 42 is located between the first and second water heat exchangers 9A, 9B and the third water heat exchanger 9C in the water pipe 18, rather than the first three-way valve 41, the third water heat exchanger 9C. placed on the side. The third three-way valve 43 is installed between the connecting portion of the water pipe 18 and the first branch pipe 19a and the first and second water heat exchangers 9A, 9B. The fourth three-way valve 44 is installed between the connecting portion of the third water heat exchanger 9C and the second branch pipe 19b of the water pipe 18 .

第１分岐管１９ａは、一端が第１，第２水熱交換器９Ａ，９Ｂの上流側の水配管１８と接続され、他端が第１三方弁４１と接続される。第２分岐管１９ｂは、一端が第２三方弁４２と接続され、他端が第３水熱交換器９Ｃの下流側の水配管１８と接続される。第３分岐管１９ｃは、一端が第３三方弁４３と接続され、他端が第４三方弁４４と接続される。 The first branch pipe 19a has one end connected to the water pipe 18 on the upstream side of the first and second water heat exchangers 9A and 9B, and the other end connected to the first three-way valve 41 . The second branch pipe 19b has one end connected to the second three-way valve 42 and the other end connected to the water pipe 18 on the downstream side of the third water heat exchanger 9C. The third branch pipe 19 c has one end connected to the third three-way valve 43 and the other end connected to the fourth three-way valve 44 .

第１～第３水熱交換器９Ａ～９Ｃにおいて水配管１８を流れる水を第１の方向に流す場合、図４に示すように、第１三方弁４１の第１分岐管１９ａ側を閉鎖し、第２三方弁４２の第２分岐管１９ｂ側を閉鎖し、第３三方弁４３の第３分岐管１９ｃ側を閉鎖し、第４三方弁４４の第３分岐管１９ｃ側を閉鎖する。また、第１三方弁４１の第３水熱交換器９Ｃ側を開放し、第２三方弁４２の第１，第２水熱交換器９Ａ，９Ｂ側を開放し、第３三方弁４３の第１，第２水熱交換器９Ａ，９Ｂ側を開放し、第４三方弁４４の第３水熱交換器９Ｃ側を開放する。これにより、水配管１８を流れる水が、第３三方弁４３を介して、第１，第２水熱交換器９Ａ，９Ｂに供給されて、その後、合流する。次に、水は、第１三方弁４１及び第２三方弁４２を介して、第３水熱交換器９Ｃに供給される。そして、第３水熱交換器９Ｃから第４三方弁４４を介して、外部へ流出する。 When the water flowing through the water pipe 18 in the first to third water heat exchangers 9A to 9C flows in the first direction, as shown in FIG. , the second three-way valve 42 on the second branch pipe 19b side is closed, the third three-way valve 43 on the third branch pipe 19c side is closed, and the fourth three-way valve 44 on the third branch pipe 19c side is closed. Further, the third water heat exchanger 9C side of the first three-way valve 41 is opened, the first and second water heat exchangers 9A, 9B side of the second three-way valve 42 is opened, and the third three-way valve 43 is opened. 1, the second water heat exchangers 9A and 9B are opened, and the third water heat exchanger 9C side of the fourth three-way valve 44 is opened. Thereby, the water flowing through the water pipe 18 is supplied to the first and second water heat exchangers 9A and 9B via the third three-way valve 43, and then joins. Water is then supplied to the third water heat exchanger 9C via the first three-way valve 41 and the second three-way valve 42 . Then, the water flows out from the third water heat exchanger 9C through the fourth three-way valve 44 to the outside.

第１～第３水熱交換器９Ａ～９Ｃにおいて水配管１８を流れる水を第１の方向とは反対の第２の方向に流す場合、第１三方弁４１の第１分岐管１９ａ側を開放し、第２三方弁４２の第２分岐管１９ｂ側を開放し、第３三方弁４３の第３分岐管１９ｃ側を開放し、第４三方弁４４の第３分岐管１９ｃ側を開放する。また、第１三方弁４１の第３水熱交換器９Ｃ側を閉鎖し、第２三方弁４２の第１，第２水熱交換器９Ａ，９Ｂ側を閉鎖し、第３三方弁４３の第１，第２水熱交換器９Ａ，９Ｂ側を閉鎖し、第４三方弁４４の第３水熱交換器９Ｃ側を閉鎖する。 When the water flowing through the water pipe 18 in the first to third water heat exchangers 9A to 9C flows in the second direction opposite to the first direction, the first branch pipe 19a side of the first three-way valve 41 is opened. Then, the second branch pipe 19b side of the second three-way valve 42 is opened, the third branch pipe 19c side of the third three-way valve 43 is opened, and the third branch pipe 19c side of the fourth three-way valve 44 is opened. In addition, the third water heat exchanger 9C side of the first three-way valve 41 is closed, the first and second water heat exchangers 9A, 9B side of the second three-way valve 42 is closed, and the third three-way valve 43 is closed. 1, the second water heat exchangers 9A and 9B are closed, and the fourth three-way valve 44 is closed on the third water heat exchanger 9C side.

これにより、水配管１８を流れる水が、第１分岐管１９ａ及び第１三方弁４１を介して、第１，第２水熱交換器９Ａ，９Ｂに供給されて、その後、合流する。次に、水は、第３三方弁４３、第３分岐管１９ｃ及び第４三方弁４４を介して、第３水熱交換器９Ｃに供給される。そして、第３水熱交換器９Ｃから第３三方弁４３及び第２分岐管１９ｂを介して、外部へ流出する。 Thereby, the water flowing through the water pipe 18 is supplied to the first and second water heat exchangers 9A and 9B via the first branch pipe 19a and the first three-way valve 41, and then joins. Water is then supplied to the third water heat exchanger 9C via the third three-way valve 43, the third branch pipe 19c and the fourth three-way valve 44. Then, it flows out from the third water heat exchanger 9C to the outside through the third three-way valve 43 and the second branch pipe 19b.

以上のように構成されたチラーユニット１は、以下のように作動する。以下では、暖房運転時において、図４に示すように、第１～第３水熱交換器９Ａ～９Ｃでは水が第１の方向に流れるように第１～第４三方弁４１～４４が切り替わり、冷房運転時において、図５に示すように、第１～第３水熱交換器９Ａ～９Ｃでは水が第２の方向に流れるように第１～第４三方弁４１～４４が切り替わる例について説明する。 The chiller unit 1 configured as described above operates as follows. Below, during heating operation, as shown in FIG. 4, the first to fourth three-way valves 41 to 44 are switched so that water flows in the first direction in the first to third water heat exchangers 9A to 9C. 5, during cooling operation, the first to fourth three-way valves 41 to 44 are switched so that water flows in the second direction in the first to third water heat exchangers 9A to 9C. explain.

まず、暖房運転時における動作について説明する。
暖房運転時には、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の四方弁８が、図１に示す暖房運転モードのポジションになる。そして、少なくとも１つの圧縮機５が作動する。圧縮機５により圧縮された高温高圧の圧縮冷媒は、オイルセパレータ６にてオイル分が分離され、四方弁８を経て第１～第３水熱交換器９Ａ～９Ｃのいずれか、又は、全てに流れる。このとき、圧縮冷媒は、水系統部３の水配管１８を流れる水と熱交換される。 First, the operation during heating operation will be described.
During heating operation, the four-way valves 8 of the first to fourth refrigeration cycle systems R1 to R4 are in the heating operation mode positions shown in FIG. At least one compressor 5 is then activated. The high-temperature and high-pressure compressed refrigerant compressed by the compressor 5 is separated from the oil by the oil separator 6, and passes through the four-way valve 8 to any or all of the first to third water heat exchangers 9A to 9C. flow. At this time, the compressed refrigerant is heat-exchanged with the water flowing through the water pipe 18 of the water system section 3 .

また、第１三方弁４１の第１分岐管１９ａ側を閉鎖し、第２三方弁４２の第２分岐管１９ｂ側を閉鎖し、第３三方弁４３の第３分岐管１９ｃ側を閉鎖し、第４三方弁４４の第３分岐管１９ｃ側を閉鎖する。さらに、第１三方弁４１の第３水熱交換器９Ｃ側を開放し、第２三方弁４２の第１，第２水熱交換器９Ａ，９Ｂ側を開放し、第３三方弁４３の第１，第２水熱交換器９Ａ，９Ｂ側を開放し、第４三方弁４４の第３水熱交換器９Ｃ側を開放する。これにより、水配管１８を流れる水が、第３三方弁４３を介して、第１，第２水熱交換器９Ａ，９Ｂに供給されて、その後、合流する。次に、水は、第１三方弁４１及び第２三方弁４２を介して、第３水熱交換器９Ｃに供給される。そして、第３水熱交換器９Ｃから第４三方弁４４を介して、外部へ流出する。そして、第１～第３水熱交換器９Ａ～９Ｃでは、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 Also, the first three-way valve 41 on the first branch pipe 19a side is closed, the second three-way valve 42 on the second branch pipe 19b side is closed, the third three-way valve 43 on the third branch pipe 19c side is closed, The third branch pipe 19c side of the fourth three-way valve 44 is closed. Furthermore, the third water heat exchanger 9C side of the first three-way valve 41 is opened, the first and second water heat exchangers 9A and 9B sides of the second three-way valve 42 are opened, and the third three-way valve 43 is opened. 1, the second water heat exchangers 9A and 9B are opened, and the third water heat exchanger 9C side of the fourth three-way valve 44 is opened. Thereby, the water flowing through the water pipe 18 is supplied to the first and second water heat exchangers 9A and 9B via the third three-way valve 43, and then joins. Water is then supplied to the third water heat exchanger 9C via the first three-way valve 41 and the second three-way valve 42 . Then, the water flows out from the third water heat exchanger 9C through the fourth three-way valve 44 to the outside. In the first to third water heat exchangers 9A to 9C, the direction of flow of refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the direction of flow of water in the water pipe 18 are countercurrent.

次に、冷房運転時における動作について説明する。
冷房運転時には、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の四方弁８が図１に示す方向から変更されて冷房運転モードのポジションになる。したがって、圧縮機５により圧縮された高温高圧の圧縮冷媒は四方弁８を経て空冷熱交換器１２に流れ、冷却ファン１２ａによって外気が供給されることにより空気と熱交換して凝縮して液化する。生成された凝縮冷媒は、レシーバ１０を経て第１～第３水熱交換器９Ａ～９Ｃのいずれか、又は、全てに流れる。このとき、凝縮冷媒は、水系統部３の水配管１８を流れる水と熱交換して気化する。 Next, the operation during cooling operation will be described.
During the cooling operation, the four-way valves 8 of the first to fourth refrigeration cycle systems R1 to R4 are changed from the direction shown in FIG. 1 to the cooling operation mode position. Therefore, the high-temperature and high-pressure compressed refrigerant compressed by the compressor 5 flows through the four-way valve 8 to the air-cooled heat exchanger 12, where it is supplied with outside air by the cooling fan 12a, exchanges heat with the air, condenses, and liquefies. . The produced condensed refrigerant flows through the receiver 10 to any one or all of the first to third water heat exchangers 9A to 9C. At this time, the condensed refrigerant exchanges heat with the water flowing through the water pipe 18 of the water system section 3 and evaporates.

また、第１三方弁４１の第１分岐管１９ａ側を開放し、第２三方弁４２の第２分岐管１９ｂ側を開放し、第３三方弁４３の第３分岐管１９ｃ側を開放し、第４三方弁４４の第３分岐管１９ｃ側を開放する。さらに、第１三方弁４１の第３水熱交換器９Ｃ側を閉鎖し、第２三方弁４２の第１，第２水熱交換器９Ａ，９Ｂ側を閉鎖し、第３三方弁４３の第１，第２水熱交換器９Ａ，９Ｂ側を閉鎖し、第４三方弁４４の第３水熱交換器９Ｃ側を閉鎖する。 Also, the first three-way valve 41 on the first branch pipe 19a side is opened, the second three-way valve 42 on the second branch pipe 19b side is opened, the third three-way valve 43 on the third branch pipe 19c side is opened, The third branch pipe 19c side of the fourth three-way valve 44 is opened. Furthermore, the third water heat exchanger 9C side of the first three-way valve 41 is closed, the first and second water heat exchangers 9A, 9B side of the second three-way valve 42 is closed, and the third three-way valve 43 is closed. 1, the second water heat exchangers 9A and 9B are closed, and the fourth three-way valve 44 is closed on the third water heat exchanger 9C side.

これにより、水配管１８を流れる水が、第１分岐管１９ａ及び第１三方弁４１を介して、第１，第２水熱交換器９Ａ，９Ｂに供給されて、その後、合流する。次に、水は、第３三方弁４３、第３分岐管１９ｃ及び第４三方弁４４を介して、第３水熱交換器９Ｃに供給される。そして、第３水熱交換器９Ｃから第３四方弁及び第２分岐管１９ｂを介して、外部へ流出する。そして、第１～第３水熱交換器９Ａ～９Ｃでは、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向が対向流となる。 Thereby, the water flowing through the water pipe 18 is supplied to the first and second water heat exchangers 9A and 9B via the first branch pipe 19a and the first three-way valve 41, and then joins. Water is then supplied to the third water heat exchanger 9C via the third three-way valve 43, the third branch pipe 19c and the fourth three-way valve 44. Then, it flows out from the third water heat exchanger 9C through the third four-way valve and the second branch pipe 19b. In the first to third water heat exchangers 9A to 9C, the direction of flow of refrigerant in the first to fourth refrigeration cycle systems R1 to R4 and the direction of flow of water in the water pipe 18 are countercurrent.

第１～第４三方弁４１～４４を切り換えることによって、第１，第２水熱交換器９Ａ，９Ｂに接続された水配管１８の水の流れ方向と、第３水熱交換器９Ｃに接続された水配管１８の水の流れ方向を変更することが可能である。したがって、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷房運転と暖房運転の切り換えに応じて、第１～第４三方弁４１～４４を切り換えることで、第１～第４冷凍サイクル系統Ｒ１～Ｒ４の冷媒の流れ方向と水配管１８の水の流れ方向を常に対向流とすることができる。また、図４及び図５に示すように、第１，第２水熱交換器９Ａ，９Ｂの組と、第３水熱交換器９Ｃが直列に配置されている場合において、第１，第２水熱交換器９Ａ，９Ｂの組のほうが第３水熱交換器９Ｃよりも常に先に水が流れる構成とすることができる。 By switching the first to fourth three-way valves 41 to 44, the water flow direction of the water pipe 18 connected to the first and second water heat exchangers 9A and 9B and the third water heat exchanger 9C. It is possible to change the flow direction of the water in the water pipe 18 that is installed. Therefore, by switching the first to fourth three-way valves 41 to 44 according to the switching between the cooling operation and the heating operation of the first to fourth refrigeration cycle systems R1 to R4, the first to fourth refrigeration cycle systems R1 to The direction of flow of the refrigerant in R4 and the direction of flow of water in the water pipe 18 can always be countercurrent. Further, as shown in FIGS. 4 and 5, when the set of the first and second water heat exchangers 9A and 9B and the third water heat exchanger 9C are arranged in series, the first and second A set of water heat exchangers 9A and 9B can be configured such that water always flows earlier than the third water heat exchanger 9C.

１：チラーユニット
３：水系統部
５：圧縮機
６：オイルセパレータ
７：逆止弁
８：四方弁
９：水熱交換器
９Ａ：第１水熱交換器
９Ｂ：第２水熱交換器
９Ｃ：第３水熱交換器
１０：レシーバ
１１：電子膨張弁
１２：空冷熱交換器
１２ａ：冷却ファン
１３：気液分離器
１５：水入口部
１６：水ポンプ
１７：水出口部
１８，１８ａ，１８ｂ，１８ｃ，１８ｄ：水配管
１９ａ：第１分岐管
１９ｂ：第２分岐管
１９ｃ：第３分岐管
２０：四方弁
２１：第１接続口
２２：第２接続口
２３：第３接続口
２４：第４接続口
３１：温度検出部
３２：圧力検出部
３３：制御部
４１：第１三方弁
４２：第２三方弁
４３：第３三方弁
４４：第４三方弁
Ｒ１：第１冷凍サイクル系統
Ｒ２：第２冷凍サイクル系統
Ｒ３：第３冷凍サイクル系統
Ｒ４：第４冷凍サイクル系統 1: Chiller unit 3: Water system unit 5: Compressor 6: Oil separator 7: Check valve 8: Four-way valve 9: Water heat exchanger 9A: First water heat exchanger 9B: Second water heat exchanger 9C: Third water heat exchanger 10: receiver 11: electronic expansion valve 12: air-cooled heat exchanger 12a: cooling fan 13: gas-liquid separator 15: water inlet 16: water pump 17: water outlets 18, 18a, 18b, 18c, 18d: water pipe 19a: first branch pipe 19b: second branch pipe 19c: third branch pipe 20: four-way valve 21: first connection port 22: second connection port 23: third connection port 24: fourth Connection port 31: temperature detection unit 32: pressure detection unit 33: control unit 41: first three-way valve 42: second three-way valve 43: third three-way valve 44: fourth three-way valve R1: first refrigeration cycle system R2: third 2 refrigeration cycle system R3: 3rd refrigeration cycle system R4: 4th refrigeration cycle system

Claims

第１水熱交換器を有し、冷媒が循環する第１冷凍サイクル系統と、
第２水熱交換器を有し、冷媒が循環する第２冷凍サイクル系統と、
第３水熱交換器を共有し、冷媒がそれぞれ循環する第３冷凍サイクル系統及び第４冷凍サイクル系統と、
前記第１水熱交換器、前記第２水熱交換器及び前記第３水熱交換器に接続され、水が流通する水配管と、
前記水配管に設置され、第１接続口、第２接続口、第３接続口及び第４接続口を有する四方弁と、
前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統において、前記第１水熱交換器、前記第２水熱交換器、又は、前記第３水熱交換器の接続口よりも上流側又は下流側に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の温度を検出する温度検出部と、
前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の圧力を検出する圧力検出部と、
制御部と、
を備え、
前記第１水熱交換器と前記第２水熱交換器が前記水配管によって並列に接続され、
前記第３水熱交換器が前記第１水熱交換器及び前記第２水熱交換器に対して前記水配管によって直列に接続され、
前記第１水熱交換器と前記第２水熱交換器において、前記第１冷凍サイクル系統及び前記第２冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、及び／又は、前記第３水熱交換器において、前記第３冷凍サイクル系統及び前記第４冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、前記水配管が構成されて、
前記第１接続口において前記水配管を流れる前記水が前記四方弁に常に流入し、前記第４接続口において前記第１水熱交換器と前記第２水熱交換器を流通した前記水、又は、前記第３水熱交換器を流通した前記水が前記四方弁から常に流出し、
前記第２接続口と前記第１水熱交換器と前記第２水熱交換器の一端側の接続口、又は、前記第３水熱交換器の一端側の接続口とが前記水配管によって接続され、前記第３接続口と前記第１水熱交換器と前記第２水熱交換器の他端側の接続口、又は、前記第３水熱交換器の他端側の接続口とが前記水配管によって接続され、
前記四方弁は、前記第１接続口と前記第２接続口が流通可能となり、かつ、前記第３接続口と前記第４接続口が流通可能となる第１モード、又は、前記第１接続口と前記第３接続口が流通可能となり、かつ、前記第２接続口と前記第４接続口が流通可能となる第２モードに切り換え可能である構成を有し、
前記制御部は、前記温度検出部によって検出された温度に基づいて前記四方弁を切り換え、前記圧力検出部によって検出された圧力に基づいて前記四方弁の切り換えの成否を判断するチラーユニット。 A first refrigeration cycle system having a first water heat exchanger and circulating a refrigerant;
A second refrigeration cycle system having a second water heat exchanger and circulating a refrigerant;
a third refrigerating cycle system and a fourth refrigerating cycle system that share a third water heat exchanger and that respectively circulate refrigerant;
a water pipe connected to the first water heat exchanger, the second water heat exchanger, and the third water heat exchanger, through which water flows;
a four-way valve installed in the water pipe and having a first connection port, a second connection port, a third connection port and a fourth connection port;
In the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system, the first water heat exchanger, the second water heat exchanger, or the third water heat exchanger A temperature detection unit that is installed upstream or downstream of the connection port and detects the temperature of the refrigerant flowing through the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system;
Installed in the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system, and flows through the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system a pressure detection unit that detects the pressure of the refrigerant;
a control unit;
with
The first water heat exchanger and the second water heat exchanger are connected in parallel by the water pipe,
The third water heat exchanger is connected in series with the first water heat exchanger and the second water heat exchanger by the water pipe,
In the first water heat exchanger and the second water heat exchanger, the flow direction of the refrigerant and the water and/or in the third water heat exchanger, according to switching between cooling operation and heating operation of the third refrigerating cycle system and the fourth refrigerating cycle system, The water pipe is configured so that the flow direction of the refrigerant and the flow direction of the water are counterflows ,
The water flowing through the water pipe at the first connection port always flows into the four-way valve, and the water flows through the first water heat exchanger and the second water heat exchanger at the fourth connection port, or , the water that has flowed through the third water heat exchanger always flows out from the four-way valve,
The second connection port, the first water heat exchanger, and one end side connection port of the second water heat exchanger, or the one end side connection port of the third water heat exchanger are connected by the water pipe. and the connection port on the other end side of the third connection port, the first water heat exchanger, and the second water heat exchanger, or the connection port on the other end side of the third water heat exchanger is the connected by water piping,
The four-way valve is in a first mode in which the first connection port and the second connection port are allowed to flow, and the third connection port and the fourth connection port are allowed to flow, or the first connection port and the third connection port can be circulated, and can be switched to a second mode in which the second connection port and the fourth connection port can be circulated,
A chiller unit in which the control section switches the four-way valve based on the temperature detected by the temperature detection section, and determines success or failure of the switching of the four-way valve based on the pressure detected by the pressure detection section.

第１水熱交換器を有し、冷媒が循環する第１冷凍サイクル系統と、
第２水熱交換器を有し、冷媒が循環する第２冷凍サイクル系統と、
第３水熱交換器を共有し、冷媒がそれぞれ循環する第３冷凍サイクル系統及び第４冷凍サイクル系統と、
前記第１水熱交換器、前記第２水熱交換器及び前記第３水熱交換器に接続され、水が流通する水配管と、
前記水配管において、前記第１水熱交換器及び前記第２水熱交換器と前記第３水熱交換器の間に設置された第１三方弁と、
一端が前記第１水熱交換器と前記第２水熱交換器の上流側の前記水配管と接続され、他端が前記第１三方弁と接続された第１分岐管と、
前記水配管において、前記第１水熱交換器及び前記第２水熱交換器と、前記第３水熱交換器の間において、前記第１三方弁よりも前記第３水熱交換器側に設置された第２三方弁と、
一端が前記第２三方弁と接続され、他端が前記第３水熱交換器の下流側の前記水配管と接続された第２分岐管と、
前記水配管と前記第１分岐管の接続部分と、前記第１水熱交換器及び前記第２水熱交換器の間に設置された第３三方弁と、
前記第３水熱交換器と、前記水配管の前記第２分岐管の接続部分の間に設置された第４三方弁と、
一端が前記第３三方弁と接続され、他端が前記第４三方弁と接続された第３分岐管と、
前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統において、前記第１水熱交換器、前記第２水熱交換器、又は、前記第３水熱交換器の接続口よりも上流側又は下流側に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の温度を検出する温度検出部と、
前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統に設置され、前記第１冷凍サイクル系統、前記第２冷凍サイクル系統、又は、前記第３冷凍サイクル系統を流れる前記冷媒の圧力を検出する圧力検出部と、
制御部と、
を備え、
前記第１水熱交換器と前記第２水熱交換器が前記水配管によって並列に接続され、
前記第３水熱交換器が前記第１水熱交換器及び前記第２水熱交換器に対して前記水配管によって直列に接続され、
前記第１水熱交換器と前記第２水熱交換器において、前記第１冷凍サイクル系統及び前記第２冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、及び／又は、前記第３水熱交換器において、前記第３冷凍サイクル系統及び前記第４冷凍サイクル系統の冷房運転と暖房運転の切り換えに応じて、前記冷媒の流れ方向と前記水の流れ方向が向かい合う対向流となるように、前記水配管が構成されて、
前記制御部は、前記温度検出部によって検出された温度に基づいて前記第１三方弁、前記第２三方弁、前記第３三方弁及び前記第４三方弁を切り換え、前記圧力検出部によって検出された圧力に基づいて前記第１三方弁、前記第２三方弁、前記第３三方弁及び前記第４三方弁の切り換えの成否を判断するチラーユニット。 A first refrigeration cycle system having a first water heat exchanger and circulating a refrigerant;
A second refrigeration cycle system having a second water heat exchanger and circulating a refrigerant;
a third refrigerating cycle system and a fourth refrigerating cycle system that share a third water heat exchanger and that respectively circulate refrigerant;
a water pipe connected to the first water heat exchanger, the second water heat exchanger, and the third water heat exchanger, through which water flows;
a first three-way valve installed between the first water heat exchanger and the second water heat exchanger and the third water heat exchanger in the water pipe;
a first branch pipe having one end connected to the water pipe on the upstream side of the first water heat exchanger and the second water heat exchanger and the other end connected to the first three-way valve;
In the water pipe, between the first water heat exchanger and the second water heat exchanger, and the third water heat exchanger, installed on the third water heat exchanger side than the first three-way valve a second three-way valve;
a second branch pipe having one end connected to the second three-way valve and the other end connected to the water pipe downstream of the third water heat exchanger;
A connecting portion between the water pipe and the first branch pipe, and a third three-way valve installed between the first water heat exchanger and the second water heat exchanger;
a fourth three-way valve installed between the third water heat exchanger and the connecting portion of the second branch pipe of the water pipe;
a third branch pipe having one end connected to the third three-way valve and the other end connected to the fourth three-way valve;
In the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system, the first water heat exchanger, the second water heat exchanger, or the third water heat exchanger A temperature detection unit that is installed upstream or downstream of the connection port and detects the temperature of the refrigerant flowing through the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system;
Installed in the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system, and flows through the first refrigeration cycle system, the second refrigeration cycle system, or the third refrigeration cycle system a pressure detection unit that detects the pressure of the refrigerant;
a control unit;
with
The first water heat exchanger and the second water heat exchanger are connected in parallel by the water pipe,
The third water heat exchanger is connected in series with the first water heat exchanger and the second water heat exchanger by the water pipe,
In the first water heat exchanger and the second water heat exchanger, the flow direction of the refrigerant and the water and/or in the third water heat exchanger, according to switching between cooling operation and heating operation of the third refrigerating cycle system and the fourth refrigerating cycle system, The water pipe is configured so that the flow direction of the refrigerant and the flow direction of the water are counterflows ,
The control unit switches the first three-way valve, the second three-way valve, the third three-way valve, and the fourth three-way valve based on the temperature detected by the temperature detection unit, and detects the temperature detected by the pressure detection unit. a chiller unit for judging success or failure of switching of the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve based on the pressure obtained.

前記第３水熱交換器が前記第１水熱交換器と前記第２水熱交換器の下流側に前記水配管によって接続されている請求項１又は２に記載のチラーユニット。 3. A chiller unit according to claim 1 or 2, wherein said third water heat exchanger is connected downstream of said first water heat exchanger and said second water heat exchanger by said water pipe.

前記四方弁は、ユニット本体の内部に設置されている請求項１に記載のチラーユニット。 The chiller unit according to claim 1 , wherein the four-way valve is installed inside the unit body.

前記四方弁は、ユニット本体の外部に設置され、前記ユニット本体の内部に設置された前記水配管と接続されている請求項１に記載のチラーユニット。 The chiller unit according to claim 1 , wherein the four-way valve is installed outside the unit body and connected to the water pipe installed inside the unit body.