JPH10227536A - Heat pump hot-water supply - Google Patents
Heat pump hot-water supplyInfo
- Publication number
- JPH10227536A JPH10227536A JP3015497A JP3015497A JPH10227536A JP H10227536 A JPH10227536 A JP H10227536A JP 3015497 A JP3015497 A JP 3015497A JP 3015497 A JP3015497 A JP 3015497A JP H10227536 A JPH10227536 A JP H10227536A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- temperature
- water supply
- hot water
- refrigerant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、冷房機能と給湯
機能を有するヒートポンプ給湯機に関する。The present invention relates to a heat pump water heater having a cooling function and a hot water supply function.
【0002】[0002]
【従来の技術】従来、ヒートポンプ給湯機としては、図
4に示すように、室外ユニット10,室内ユニット20
および貯湯タンクユニット30を備えて、冷暖房運転お
よび給湯運転を行うものがある。このヒートポンプ給湯
機は、室外ユニット10の圧縮機11,四路弁12,室外
熱交換器13および電動膨張弁EV1,EV2と、室内
ユニット20の室内熱交換器14を環状に接続して構成
された冷媒回路を有している。上記圧縮機11と四路弁
12との間の冷媒配管31に電磁弁21を配設し、電動
膨張弁EV1と電動膨張弁EV2との間の冷媒配管32
に閉鎖弁22を配設すると共に、室内熱交換器14と四
路弁12との間の冷媒配管33に閉鎖弁23を配設して
いる。2. Description of the Related Art Conventionally, as a heat pump water heater, as shown in FIG.
And a hot water storage tank unit 30 for performing a cooling / heating operation and a hot water supply operation. This heat pump water heater is configured by connecting the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, and the electric expansion valves EV1, EV2 of the outdoor unit 10 and the indoor heat exchanger 14 of the indoor unit 20 in a ring shape. The refrigerant circuit. An electromagnetic valve 21 is disposed in a refrigerant pipe 31 between the compressor 11 and the four-way valve 12, and a refrigerant pipe 32 between the electric expansion valve EV1 and the electric expansion valve EV2.
, A closing valve 23 is provided in a refrigerant pipe 33 between the indoor heat exchanger 14 and the four-way valve 12.
【0003】また、上記室外ユニット10の冷媒配管3
2にキャピラリチューブ43の一端を、キャピラリチュ
ーブ43側から閉鎖弁22側への流れのみを許容する逆
止弁41,42を介して接続している。上記キャピラリ
チューブ43の他端を貯湯タンクユニット30の二重管
構造の給湯熱交換器15の一端に接続している。上記給
湯熱交換器15の他端を室外ユニット10の圧縮機11
の吐出側に冷媒配管34により接続して、その冷媒配管
34に給湯熱交換器15側から順に閉鎖弁24と電磁弁
25を配設している。そして、上記室外ユニット10の
閉鎖弁24と電磁弁25との間の冷媒配管34にアキュ
ムレータ17の上流側を冷媒配管35により接続して、
その冷媒配管35に電磁弁26を配設している。The refrigerant pipe 3 of the outdoor unit 10
2, one end of the capillary tube 43 is connected via check valves 41 and 42 that allow only the flow from the capillary tube 43 side to the closing valve 22 side. The other end of the capillary tube 43 is connected to one end of a hot water supply heat exchanger 15 having a double pipe structure of the hot water storage tank unit 30. The other end of the hot water supply heat exchanger 15 is connected to the compressor 11 of the outdoor unit 10.
Is connected by a refrigerant pipe 34, and a closing valve 24 and a solenoid valve 25 are disposed on the refrigerant pipe 34 in order from the hot water supply heat exchanger 15 side. Then, the upstream side of the accumulator 17 is connected to a refrigerant pipe 34 between the closing valve 24 and the solenoid valve 25 of the outdoor unit 10 by a refrigerant pipe 35,
An electromagnetic valve 26 is provided in the refrigerant pipe 35.
【0004】上記構成のヒートポンプ給湯機は、給湯運
転を停止した状態で冷房運転のみを行うときは、電磁弁
21と電磁弁26を開いて、電磁弁25を閉じると共
に、電動膨張弁EV1を全開にして、電動膨張弁EV2
を所定開度にする。そうすると、上記圧縮機11から吐
出された冷媒が室外熱交換器13,電動膨張弁EV1,電
動膨張弁EV2,室内熱交換器14およびアキュムレー
タ17の順に循環して、室外熱交換器13で冷媒を凝縮
させ、室内熱交換器14で冷媒を蒸発させて、冷房運転
を行う。このとき、上記貯湯タンクユニット30の給湯
熱交換器15には冷媒が流れず、キャピラリチューブ4
3から電磁弁26までの給湯熱交換器15側の冷媒回路
は、電磁弁26を介して低圧側に接続されて、給湯熱交
換器15側の冷媒回路内を低圧にしている。そして、冷
房運転中に貯湯タンクユニット30の貯湯タンク16の
残湯量が出湯により減少して、給湯運転を開始する場
合、電磁弁21を閉じて、電動膨張弁EV1を全閉にす
ると共に、電磁弁26を閉じる一方、電磁弁25を開
く。そうして、上記圧縮機11から吐出された冷媒が給
湯熱交換器15,キャピラリチューブ43,逆止弁42,
逆止弁41,電動膨張弁EV2,室内熱交換器14および
アキュムレータ17の順に循環して、給湯熱交換器15
で冷媒を凝縮させて、貯湯タンク16内の湯を沸かし、
室内熱交換器14で冷媒を蒸発させて、冷房運転を行
う。In the heat pump water heater having the above configuration, when only the cooling operation is performed with the hot water supply operation stopped, the electromagnetic valves 21 and 26 are opened, the electromagnetic valve 25 is closed, and the electric expansion valve EV1 is fully opened. And the electric expansion valve EV2
To a predetermined opening. Then, the refrigerant discharged from the compressor 11 circulates in the order of the outdoor heat exchanger 13, the electric expansion valve EV1, the electric expansion valve EV2, the indoor heat exchanger 14, and the accumulator 17, and the refrigerant is circulated in the outdoor heat exchanger 13. The cooling operation is performed by condensing the refrigerant and evaporating the refrigerant in the indoor heat exchanger 14. At this time, no refrigerant flows through the hot water supply heat exchanger 15 of the hot water storage tank unit 30, and the capillary tube 4
The refrigerant circuit on the hot water supply heat exchanger 15 side from 3 to the electromagnetic valve 26 is connected to the low pressure side via the electromagnetic valve 26 to reduce the pressure inside the refrigerant circuit on the hot water supply heat exchanger 15 side. Then, when the remaining hot water in the hot water storage tank 16 of the hot water storage tank unit 30 decreases due to tapping during the cooling operation and the hot water supply operation is started, the electromagnetic valve 21 is closed, the electric expansion valve EV1 is fully closed, and the electromagnetic operation is started. The solenoid valve 25 is opened while the valve 26 is closed. Then, the refrigerant discharged from the compressor 11 is supplied to the hot water supply heat exchanger 15, the capillary tube 43, the check valve 42,
The check valve 41, the electric expansion valve EV2, the indoor heat exchanger 14, and the accumulator 17 circulate in this order, and the hot water supply heat exchanger 15
To condense the refrigerant and boil the hot water in the hot water storage tank 16,
The cooling operation is performed by evaporating the refrigerant in the indoor heat exchanger 14.
【0005】[0005]
【発明が解決しようとする課題】ところで、上記ヒート
ポンプ給湯機では、冷房運転中に給湯運転を開始する場
合、貯湯タンクユニット30側の冷媒回路内が低圧のた
めに、冷媒回路の切り換え時に音が発生すると共に、均
圧等のために圧縮機11を停止させる休止時間を必要と
するので、冷房の速冷性が損なわれると共に、給湯の立
ち上がりが遅れるという欠点がある。また、給湯運転を
停止した状態で冷房運転を行うとき、逆止弁41,42
から給湯熱交換器15に高圧冷媒が漏れると、二重管構
造の給湯熱交換器15内の水が凍結して膨張し、給湯熱
交換器15が破裂する虞れがある。In the heat pump water heater, when the hot water supply operation is started during the cooling operation, since the pressure in the refrigerant circuit on the side of the hot water storage tank unit 30 is low, noise is generated when the refrigerant circuit is switched. In addition to this, a downtime for stopping the compressor 11 for equalizing pressure and the like is required, so that the quick cooling of the cooling is impaired and the rise of hot water supply is delayed. When performing the cooling operation in a state where the hot water supply operation is stopped, the check valves 41 and 42 are used.
When the high-pressure refrigerant leaks from the hot water supply heat exchanger 15 into the hot water supply heat exchanger 15, the water in the double pipe structure hot water supply heat exchanger 15 freezes and expands, and the hot water supply heat exchanger 15 may be ruptured.
【0006】そこで、この発明の目的は、冷房運転から
冷房/給湯運転に切り換えるとき、冷媒回路の切換音の
発生を防ぐと共に、圧縮機を停止させることなく、冷房
の速冷性を向上でき、給湯の立ち上がりの遅れを防止で
きる信頼性の高いヒートポンプ給湯機を提供することに
ある。Therefore, an object of the present invention is to prevent the generation of switching noise of the refrigerant circuit when switching from the cooling operation to the cooling / hot water supply operation, and to improve the rapid cooling of the cooling without stopping the compressor. An object of the present invention is to provide a highly reliable heat pump water heater capable of preventing a delay in rising of hot water.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するた
め、請求項1のヒートポンプ給湯機は、圧縮機,室外熱
交換器,減圧器および室内熱交換器が環状に接続された
冷媒回路と、上記圧縮機の吐出側に一端が接続された給
湯熱交換器と、上記給湯熱交換器の他端に一端が接続さ
れ、他端が上記室外熱交換器と上記減圧器との間の冷媒
配管に接続された電動膨張弁とを備えたことを特徴とし
ている。According to a first aspect of the present invention, there is provided a heat pump water heater, comprising: a refrigerant circuit in which a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are connected in a ring; A hot water supply heat exchanger having one end connected to the discharge side of the compressor, and one end connected to the other end of the hot water supply heat exchanger, and the other end connected to a refrigerant pipe between the outdoor heat exchanger and the decompressor. And an electric expansion valve connected to the motor.
【0008】上記請求項1のヒートポンプ給湯機によれ
ば、給湯運転を停止した状態で冷房運転を行うときは、
上記電動膨張弁の開度を絞ることによって、電動膨張弁
から圧縮機の吐出側までの給湯熱交換器側の冷媒回路を
高圧にする。そして、冷房運転中に給湯運転を開始する
場合は、給湯熱交換器側の冷媒回路内が高圧であるの
で、圧縮機を停止させる必要がなく、そのままの状態か
ら電動膨張弁を所定開度に開いて、圧縮機,給湯熱交換
器,電動膨張弁,減圧器および室内熱交換器の順に冷媒を
循環させる。そうすることによって、上記給湯熱交換器
内で冷媒を凝縮させて、湯を沸かす熱交換を行うと共
に、室内熱交換器で冷媒を蒸発させて、室内空気と熱交
換をして冷房運転を行う。したがって、冷房運転状態か
ら冷房と給湯の両方を行う冷房/給湯運転に切り換える
とき、冷媒回路の切換音の発生を防ぐことができると共
に、圧縮機を停止させる必要がなく、冷房の速冷性を向
上でき、給湯の立ち上がりの遅れを防止できる。また、
上記圧縮機の起動/停止の回数を減らすと共に、給湯熱
交換器の凍結の虞れがなくなり、信頼性を向上できる。According to the heat pump water heater of the first aspect, when performing the cooling operation while the hot water supply operation is stopped,
By narrowing the opening of the electric expansion valve, the refrigerant circuit on the hot water supply heat exchanger side from the electric expansion valve to the discharge side of the compressor has a high pressure. When the hot water supply operation is started during the cooling operation, since the pressure in the refrigerant circuit on the side of the hot water supply heat exchanger is high, it is not necessary to stop the compressor. Open and circulate the refrigerant in the order of compressor, hot water supply heat exchanger, electric expansion valve, decompressor and indoor heat exchanger. By doing so, the refrigerant is condensed in the hot water supply heat exchanger to perform heat exchange for boiling water, and the refrigerant is evaporated in the indoor heat exchanger to exchange heat with indoor air to perform a cooling operation. . Therefore, when switching from the cooling operation state to the cooling / hot water supply operation for performing both cooling and hot water supply, it is possible to prevent the generation of the switching noise of the refrigerant circuit, and it is not necessary to stop the compressor. It is possible to improve and prevent a delay in rising of hot water supply. Also,
The number of times of starting / stopping the compressor is reduced, and the possibility of freezing of the hot water supply heat exchanger is eliminated, so that the reliability can be improved.
【0009】また、請求項2のヒートポンプ給湯機は、
請求項1のヒートポンプ給湯機において、給湯運転を停
止した状態で冷房運転を行う場合、上記室外熱交換器の
出口側の冷媒温度と上記給湯熱交換器の出口側の冷媒温
度とが略等しくなるように上記電動膨張弁の開度を制御
する制御装置を備えたことを特徴としている。The heat pump water heater according to claim 2 is
In the heat pump water heater of the first aspect, when performing the cooling operation in a state where the hot water supply operation is stopped, the refrigerant temperature at the outlet side of the outdoor heat exchanger is substantially equal to the refrigerant temperature at the outlet side of the hot water supply heat exchanger. Thus, a control device for controlling the opening degree of the electric expansion valve is provided.
【0010】上記請求項2のヒートポンプ給湯機によれ
ば、給湯運転停止中の冷房運転時に、給湯熱交換器の出
口側の冷媒温度が室外熱交換器の出口側の冷媒温度に略
等しくなるように、電動膨張弁の開度を調整することに
よって、室外熱交換器の出口側と減圧器との間の冷媒配
管に電動膨張弁の下流側が接続された合流点において、
室外熱交換器側からの冷媒と給湯熱交換器側からの冷媒
の過冷却の状態をほぼ同じにする。したがって、上記室
外熱交換器の出口側の冷媒温度が給湯熱交換器側から流
入する冷媒により上昇することがなく、冷房能力の低下
を防止できる。According to the heat pump water heater of the second aspect, during the cooling operation while the hot water supply operation is stopped, the refrigerant temperature at the outlet side of the hot water supply heat exchanger is substantially equal to the refrigerant temperature at the outlet side of the outdoor heat exchanger. By adjusting the opening of the electric expansion valve, at the junction where the downstream side of the electric expansion valve is connected to the refrigerant pipe between the outlet side of the outdoor heat exchanger and the pressure reducer,
The state of supercooling of the refrigerant from the outdoor heat exchanger and that of the refrigerant from the hot water supply heat exchanger are made substantially the same. Therefore, the temperature of the refrigerant at the outlet side of the outdoor heat exchanger does not rise due to the refrigerant flowing in from the hot water supply heat exchanger side, and a decrease in the cooling capacity can be prevented.
【0011】また、請求項3のヒートポンプ給湯機は、
請求項2のヒートポンプ給湯機において、上記室外熱交
換器の出口側の冷媒温度を検出する第1温度センサと、
上記給湯熱交換器の出口側の冷媒温度を検出する第2温
度センサとを備えて、上記制御装置は、上記第2温度セ
ンサにより検出された上記給湯熱交換器の出口側の冷媒
温度が上記第1温度センサにより検出された上記室外熱
交換器の出口側の冷媒温度よりも高く、かつ、上記給湯
熱交換器の出口側の冷媒温度と上記室外熱交換器の出口
側の冷媒温度との温度差が第1所定温度よりも高いか否
かを判別する第1温度判別部と、上記第2温度センサに
より検出された上記給湯熱交換器の出口側の冷媒温度が
上記第1温度センサにより検出された上記室外熱交換器
の出口側の冷媒温度よりも低く、かつ、上記給湯熱交換
器の出口側の冷媒温度と上記室外熱交換器の出口側の冷
媒温度との温度差が第2所定温度よりも低いか否かを判
別する第2温度判別部と、上記給湯熱交換器の出口側の
冷媒温度が上記室外熱交換器の出口側の冷媒温度よりも
高く、かつ、上記給湯熱交換器の出口側の冷媒温度と上
記室外熱交換器の出口側の冷媒温度との温度差が第1所
定温度よりも高いと上記第1温度判別部が判別すると、
上記電動膨張弁の開度を小さくする一方、上記給湯熱交
換器の出口側の冷媒温度が上記室外熱交換器の出口側の
冷媒温度よりも低く、かつ、上記給湯熱交換器の出口側
の冷媒温度と上記室外熱交換器の出口側の冷媒温度との
温度差が第2所定温度よりも低いと上記第2温度判別部
が判別すると、上記電動膨張弁の開度を大きくする電動
膨張弁制御部とを備えたことを特徴としている。The heat pump water heater according to claim 3 is
The heat pump water heater according to claim 2, wherein a first temperature sensor for detecting a refrigerant temperature on an outlet side of the outdoor heat exchanger,
A second temperature sensor for detecting a refrigerant temperature at an outlet side of the hot water supply heat exchanger, wherein the control device is configured to control a temperature of the refrigerant at an outlet side of the hot water supply heat exchanger detected by the second temperature sensor. The temperature of the refrigerant at the outlet of the outdoor heat exchanger is higher than the refrigerant temperature at the outlet of the outdoor heat exchanger detected by the first temperature sensor, and the temperature of the refrigerant at the outlet of the hot water supply heat exchanger is the same as the temperature of the refrigerant at the outlet of the outdoor heat exchanger. A first temperature determination unit that determines whether the temperature difference is higher than a first predetermined temperature; and a refrigerant temperature at an outlet side of the hot water supply heat exchanger detected by the second temperature sensor is determined by the first temperature sensor. The temperature difference between the detected refrigerant temperature at the outlet side of the outdoor heat exchanger and the refrigerant temperature at the outlet side of the hot water supply heat exchanger and the refrigerant temperature at the outlet side of the outdoor heat exchanger is the second. A second temperature determination for determining whether the temperature is lower than a predetermined temperature; Portion, the refrigerant temperature at the outlet side of the hot water supply heat exchanger is higher than the refrigerant temperature at the outlet side of the outdoor heat exchanger, and the refrigerant temperature at the outlet side of the hot water supply heat exchanger and the temperature of the outdoor heat exchanger. When the first temperature determining unit determines that the temperature difference from the refrigerant temperature on the outlet side is higher than a first predetermined temperature,
While the opening degree of the electric expansion valve is reduced, the refrigerant temperature on the outlet side of the hot water supply heat exchanger is lower than the refrigerant temperature on the outlet side of the outdoor heat exchanger, and the outlet side of the hot water supply heat exchanger. When the second temperature discriminator determines that the temperature difference between the refrigerant temperature and the refrigerant temperature on the outlet side of the outdoor heat exchanger is lower than a second predetermined temperature, the electric expansion valve increases the opening of the electric expansion valve. And a control unit.
【0012】上記請求項3のヒートポンプ給湯機によれ
ば、上記第1温度判別部が給湯熱交換器の出口側の冷媒
温度が室外熱交換器の出口側の冷媒温度よりも高く、か
つ、その給湯熱交換器の出口側の冷媒温度と室外熱交換
器の出口側の冷媒温度との温度差が第1所定温度よりも
高いと判別すると、電動膨張弁制御部は、電動膨張弁の
開度を小さくし、給湯熱交換器側から室外熱交換器の出
口側に電動膨張弁を介して流れる冷媒流量を減らして、
給湯熱交換器の出口側の冷媒温度を低下させる。一方、
上記第2温度判別部が給湯熱交換器の出口側の冷媒温度
が室外熱交換器の出口側の冷媒温度よりも低く、かつ、
その給湯熱交換器の出口側の冷媒温度と室外熱交換器の
出口側の冷媒温度との温度差が第2所定温度よりも低い
と判別すると、電動膨張弁制御部は、電動膨張弁の開度
を大きくし、給湯熱交換器側から室外熱交換器の出口側
に電動膨張弁を介して流れる冷媒流量を増やして、給湯
熱交換器の出口側の冷媒温度を上昇させる。したがっ
て、上記電動膨張弁の簡単な制御によって、室外熱交換
器の出口側の冷媒温度と給湯熱交換器の出口側の冷媒温
度とを略等しくできる。[0012] According to the heat pump water heater of the third aspect, the first temperature discriminator determines that the refrigerant temperature at the outlet side of the hot water heat exchanger is higher than the refrigerant temperature at the outlet side of the outdoor heat exchanger. When it is determined that the temperature difference between the refrigerant temperature on the outlet side of the hot water supply heat exchanger and the refrigerant temperature on the outlet side of the outdoor heat exchanger is higher than the first predetermined temperature, the electric expansion valve control unit determines the opening degree of the electric expansion valve. The refrigerant flow from the hot water supply heat exchanger side to the outlet side of the outdoor heat exchanger through the electric expansion valve,
The temperature of the refrigerant at the outlet of the hot water supply heat exchanger is reduced. on the other hand,
The second temperature determination unit is configured such that the refrigerant temperature at the outlet side of the hot water supply heat exchanger is lower than the refrigerant temperature at the outlet side of the outdoor heat exchanger, and
When determining that the temperature difference between the refrigerant temperature on the outlet side of the hot water supply heat exchanger and the refrigerant temperature on the outlet side of the outdoor heat exchanger is lower than the second predetermined temperature, the electric expansion valve control unit opens the electric expansion valve. The temperature of the refrigerant at the outlet side of the hot water supply heat exchanger is increased by increasing the refrigerant flow rate from the hot water supply heat exchanger side to the outlet side of the outdoor heat exchanger through the electric expansion valve. Therefore, by the simple control of the electric expansion valve, the refrigerant temperature on the outlet side of the outdoor heat exchanger can be made substantially equal to the refrigerant temperature on the outlet side of the hot water supply heat exchanger.
【0013】[0013]
【発明の実施の形態】以下、この発明のヒートポンプ給
湯機を図示の実施の形態により詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heat pump water heater according to the present invention will be described in detail with reference to the illustrated embodiments.
【0014】図1はこの発明の実施の一形態のヒートポ
ンプ給湯機の回路図である。このヒートポンプ給湯機
は、室外ユニット1,室内ユニット2および貯湯タンク
ユニット3を備えている。上記室外ユニット1は、圧縮
機11と、上記圧縮機11の吐出側に接続された四路弁
12と、上記四路弁12に一端が接続された室外熱交換
器13と、上記室外熱交換器13の他端に一端が接続さ
れた電動膨張弁EV1とを有している。上記電動膨張弁
EV1の他端に電動膨張弁EV2の一端を閉鎖弁22を
介して接続している。また、上記室外ユニット1の電動
膨張弁EV2の他端と室内ユニット2の室内熱交換器1
4の一端と接続している。上記室内ユニット2の室内熱
交換器14の他端を室外ユニット1の四路弁12,アキ
ュムレータ17を介して圧縮機11の吸入側に接続して
いる。また、上記圧縮機11と四路弁12との間の冷媒
配管31に電磁弁21を配設すると共に、室内ユニット
2の室内熱交換器14と四路弁12との間の冷媒配管3
3に閉鎖弁23を配設している。FIG. 1 is a circuit diagram of a heat pump water heater according to one embodiment of the present invention. The heat pump water heater includes an outdoor unit 1, an indoor unit 2, and a hot water storage tank unit 3. The outdoor unit 1 includes a compressor 11, a four-way valve 12 connected to the discharge side of the compressor 11, an outdoor heat exchanger 13 having one end connected to the four-way valve 12, and an outdoor heat exchanger. An electric expansion valve EV1 having one end connected to the other end of the vessel 13. One end of an electric expansion valve EV2 is connected to the other end of the electric expansion valve EV1 via a closing valve 22. The other end of the electric expansion valve EV2 of the outdoor unit 1 and the indoor heat exchanger 1 of the indoor unit 2
4 is connected to one end. The other end of the indoor heat exchanger 14 of the indoor unit 2 is connected to the suction side of the compressor 11 via the four-way valve 12 and the accumulator 17 of the outdoor unit 1. In addition, an electromagnetic valve 21 is provided in a refrigerant pipe 31 between the compressor 11 and the four-way valve 12, and a refrigerant pipe 3 between the indoor heat exchanger 14 of the indoor unit 2 and the four-way valve 12 is provided.
3 is provided with a closing valve 23.
【0015】また、上記閉鎖弁22と電動膨張弁EV2
との間の冷媒配管32に電動膨張弁EV3の一端を接続
し、その電動膨張弁EV3の他端を貯湯タンクユニット
3の二重管構造の給湯熱交換器15の一端に接続してい
る。上記給湯熱交換器15の内管の上端を貯湯タンク1
6の中間位置に接続する一方、給湯熱交換器15の内管
の下端を貯湯タンク16の底に接続している。上記貯湯
タンク16内の湯を貯湯タンク16と給湯熱交換器15
の内管内にポンプ18により循環させて、給湯熱交換器
15で熱交換を行って湯を沸かす。上記給湯熱交換器1
5の他端を圧縮機11の吐出側に冷媒配管34により接
続して、その冷媒配管34に給湯熱交換器15側から順
に閉鎖弁24と電磁弁25を配設している。そして、上
記閉鎖弁24と電磁弁25との間の冷媒配管34にアキ
ュムレータ17の上流側を冷媒配管35により接続し
て、その冷媒配管35に電磁弁26を配設している。Further, the closing valve 22 and the electric expansion valve EV2
One end of the electric expansion valve EV3 is connected to the refrigerant pipe 32 between the two, and the other end of the electric expansion valve EV3 is connected to one end of the hot water supply heat exchanger 15 of the double pipe structure of the hot water storage tank unit 3. The upper end of the inner pipe of the hot water supply heat exchanger 15 is
6, the lower end of the inner pipe of the hot water supply heat exchanger 15 is connected to the bottom of the hot water storage tank 16. The hot water in the hot water storage tank 16 is stored in the hot water storage tank 16 and the hot water supply heat exchanger 15.
The water is circulated in the inner pipe by the pump 18 and heat is exchanged in the hot water supply heat exchanger 15 to boil the hot water. The hot water supply heat exchanger 1
The other end of 5 is connected to the discharge side of the compressor 11 by a refrigerant pipe 34, and a closing valve 24 and a solenoid valve 25 are arranged in the refrigerant pipe 34 in order from the hot water supply heat exchanger 15 side. The upstream side of the accumulator 17 is connected to a refrigerant pipe 34 between the closing valve 24 and the solenoid valve 25 by a refrigerant pipe 35, and the solenoid valve 26 is disposed in the refrigerant pipe 35.
【0016】また、上記ヒートポンプ給湯機は、室外熱
交換器13の出口側に冷媒温度を検出する第1温度セン
サとしてのサーミスタ51を設けると共に、給湯熱交換
器15の出口側に冷媒温度を検出する第2温度センサと
してのサーミスタ52を設けている。上記ヒートポンプ
給湯機は、サーミスタ51,52の出力信号を受けて、
圧縮機11や電動膨張弁EV1〜EV3等を制御する制
御装置50を備えている。上記制御装置50は、マイク
ロコンピュータと入出力回路等からなり、上記サーミス
タ52により検出された給湯熱交換器15の出口側の冷
媒温度がサーミスタ51により検出された室外熱交換器
13の出口側の冷媒温度よりも高く、かつ、給湯熱交換
器15の出口側の冷媒温度と室外熱交換器13の出口側
の冷媒温度との温度差が第1所定温度αよりも高いか否
かを判別する第1温度判別部50aと、上記サーミスタ
52により検出された給湯熱交換器15の出口側の冷媒
温度がサーミスタ51により検出された室外熱交換器1
3の出口側の冷媒温度よりも低く、かつ、給湯熱交換器
15の出口側の冷媒温度と室外熱交換器13の出口側の
冷媒温度との温度差が第2所定温度−αよりも低いか否
かを判別する第2温度判別部50bと、上記第1温度判
別部50aと第2温度判別部50bとの判別結果に基づい
て、電動膨張弁EV3の開度を制御する電動膨張弁制御
部50cとを有している。Further, the heat pump water heater has a thermistor 51 as a first temperature sensor for detecting a refrigerant temperature at an outlet side of the outdoor heat exchanger 13 and detects a refrigerant temperature at an outlet side of the hot water supply heat exchanger 15. A thermistor 52 as a second temperature sensor is provided. The heat pump water heater receives the output signals of the thermistors 51 and 52,
A control device 50 for controlling the compressor 11, the electric expansion valves EV1 to EV3, and the like is provided. The control device 50 includes a microcomputer, an input / output circuit, and the like. The refrigerant temperature at the outlet side of the hot water supply heat exchanger 15 detected by the thermistor 52 is at the outlet side of the outdoor heat exchanger 13 detected by the thermistor 51. It is determined whether the temperature is higher than the refrigerant temperature and the temperature difference between the refrigerant temperature at the outlet side of the hot water supply heat exchanger 15 and the refrigerant temperature at the outlet side of the outdoor heat exchanger 13 is higher than a first predetermined temperature α. A first temperature discriminator 50a and an outdoor heat exchanger 1 in which the refrigerant temperature on the outlet side of the hot water supply heat exchanger 15 detected by the thermistor 52 is detected by the thermistor 51;
3 and a temperature difference between the refrigerant temperature on the outlet side of the hot water supply heat exchanger 15 and the refrigerant temperature on the outlet side of the outdoor heat exchanger 13 is lower than the second predetermined temperature -α. Electric expansion valve control for controlling the degree of opening of the electric expansion valve EV3 based on the judgment result of the second temperature judgment unit 50b for judging whether or not the temperature is high, and the judgment result of the first temperature judgment unit 50a and the second temperature judgment unit 50b. A portion 50c.
【0017】上記構成のヒートポンプ給湯機は、給湯運
転を停止した状態で冷房運転するときは、図1に示すよ
うに、電磁弁21と電磁弁25を開く一方、電磁弁26
を閉じると共に、電動膨張弁EV1を全開にし、電動膨
張弁EV2を所定開度にする。そして、上記圧縮機11
から吐出された冷媒は、室外熱交換器13,電動膨張弁
EV1,電動膨張弁EV2,室内熱交換器14およびアキ
ュムレータ17の順に循環する。このとき、上記電動膨
張弁EV3の開度を制御装置50により制御する。In the heat pump water heater of the above configuration, when the cooling operation is performed in a state where the hot water supply operation is stopped, as shown in FIG. 1, the electromagnetic valves 21 and 25 are opened, while the electromagnetic valve 26 is opened.
Is closed, the electric expansion valve EV1 is fully opened, and the electric expansion valve EV2 is set to a predetermined opening degree. And the compressor 11
Is circulated in the order of the outdoor heat exchanger 13, the electric expansion valve EV1, the electric expansion valve EV2, the indoor heat exchanger 14, and the accumulator 17. At this time, the opening degree of the electric expansion valve EV3 is controlled by the control device 50.
【0018】図2は上記制御装置50の電動膨張弁EV
3の開度制御の動作を説明するフローチャートである。FIG. 2 shows the electric expansion valve EV of the control device 50.
6 is a flowchart illustrating an operation of an opening degree control 3;
【0019】以下、図2に従って上記制御装置50の開
度制御処理を説明する。The opening control process of the control device 50 will be described below with reference to FIG.
【0020】まず、処理がスタートすると、ステップS
1で第1温度判別部50aによりサーミスタ52により
検出された給湯熱交換器15の出口側の冷媒温度DLW
とサーミスタ51により検出された室外熱交換器13の
出口側の冷媒温度DELとの温度差(DLW−DEL)が
第1所定温度αよりも高いか否かを判別する。そして、
ステップS1で温度差(DLW−DEL)が第1所定温度
αよりも高いと判別すると、ステップS4に進む一方、
温度差(DLW−DEL)が第1所定温度αよりも低いか
等しいと判別すると、ステップS2に進む。First, when the process starts, step S
In 1, the refrigerant temperature DLW on the outlet side of the hot water supply heat exchanger 15 detected by the thermistor 52 by the first temperature determination unit 50 a
It is determined whether the temperature difference (DLW-DEL) between the temperature and the refrigerant temperature DEL on the outlet side of the outdoor heat exchanger 13 detected by the thermistor 51 is higher than the first predetermined temperature α. And
If it is determined in step S1 that the temperature difference (DLW-DEL) is higher than the first predetermined temperature α, the process proceeds to step S4,
If it is determined that the temperature difference (DLW-DEL) is lower than or equal to the first predetermined temperature α, the process proceeds to step S2.
【0021】次に、ステップS2で第1温度判別部50
aによりサーミスタ52により検出された給湯熱交換器
15の出口側の冷媒温度DLWとサーミスタ51により
検出された室外熱交換器13の出口側の冷媒温度DEL
との温度差(DLW−DEL)が第2所定温度−αよりも
低いか否かを判別する。そして、ステップS1で温度差
(DLW−DEL)が第2所定温度−αよりも低いと判別
すると、ステップS1に戻る一方、温度差(DLW−D
EL)が第2所定温度−αよりも高いか等しいと判別す
ると、ステップS3に進む。Next, in step S2, the first temperature discriminating section 50
The refrigerant temperature DLW on the outlet side of the hot water supply heat exchanger 15 detected by the thermistor 52 in accordance with a and the refrigerant temperature DEL on the outlet side of the outdoor heat exchanger 13 detected by the thermistor 51
It is determined whether or not the temperature difference (DLW-DEL) is lower than the second predetermined temperature −α. Then, in step S1, the temperature difference
If it is determined that (DLW-DEL) is lower than the second predetermined temperature -α, the process returns to step S1 while the temperature difference (DLW-DEL) is determined.
If it is determined that EL) is higher than or equal to the second predetermined temperature -α, the process proceeds to step S3.
【0022】次に、ステップS3で電動膨張弁EV3の
開度EVWを所定開度β大きくした後、ステップS1に
戻る。Next, after the opening EVW of the electric expansion valve EV3 is increased by a predetermined opening β in step S3, the process returns to step S1.
【0023】一方、ステップS4で電動膨張弁EV3の
開度EVWを所定開度β小さくした後、ステップS1に
戻る。On the other hand, after reducing the opening EVW of the electric expansion valve EV3 by a predetermined opening β in step S4, the process returns to step S1.
【0024】なお、上記所定開度βは、 β = |DEW−DEL|×γ (γ:係数) により求める。The predetermined opening β is obtained by β = │DEW-DEL│ × γ (γ: coefficient).
【0025】このように、給湯運転を停止した状態で冷
房運転を行っているとき、上記電磁弁25を開き、電磁
弁26を閉じると共に、電動膨張弁EV3の開度を絞る
ことによって、電動膨張弁EV3から電磁弁25までの
給湯熱交換器15側の冷媒回路内を高圧にする。このと
き、上記制御装置50によって、給湯熱交換器15の出
口側の冷媒温度DLWと室外熱交換器13の出口側の冷
媒温度DELとの温度差(DLW−DEL)が所定温度α
よりも高い場合、その温度差(DLW−DEL)の絶対
値に基づいて電動膨張弁EV3の開度EVWを小さくし
て、給湯熱交換器15側から室外熱交換器13の出口側
に流入する冷媒流量を少なくする一方、上記温度差(D
LW−DEL)が所定温度−αよりも低い場合、その温
度差(DLW−DEL)の絶対値に基づいて電動膨張弁E
V3の開度EVWを大きくして、給湯熱交換器15側か
ら室外熱交換器13の出口側に流入する冷媒流量を多く
する。このように、上記電動膨張弁EV3の開度EVW
を調整することによって、室外熱交換器13の出口側と
電動膨張弁EV2との間の冷媒配管32に電動膨張弁E
V3の下流側が接続された合流点Aにおいて、室外熱交
換器13側からの冷媒と給湯熱交換器15側からの冷媒
の過冷却の状態をほぼ同じにする。そして、冷房運転中
に給湯運転を開始する場合は、圧縮機11を停止させる
ことなく、電動膨張弁EV1を閉じると共に、電動膨張
弁EV3を所定開度に開いて、圧縮機11,給湯熱交換
器15,電動膨張弁EV3,電動膨張弁EV2および室内
熱交換器14の順に冷媒を循環させて、給湯熱交換器1
5で熱交換を行う。As described above, when the cooling operation is performed while the hot water supply operation is stopped, the electromagnetic valve 25 is opened, the electromagnetic valve 26 is closed, and the opening of the electric expansion valve EV3 is reduced, so that the electric expansion is performed. The pressure in the refrigerant circuit on the hot water supply heat exchanger 15 side from the valve EV3 to the solenoid valve 25 is increased. At this time, the temperature difference (DLW-DEL) between the refrigerant temperature DLW on the outlet side of the hot water supply heat exchanger 15 and the refrigerant temperature DEL on the outlet side of the outdoor heat exchanger 13 is determined by the control device 50 to be the predetermined temperature α.
If it is higher, the opening EVW of the electric expansion valve EV3 is reduced based on the absolute value of the temperature difference (DLW-DEL), and flows from the hot water supply heat exchanger 15 to the outlet of the outdoor heat exchanger 13. While reducing the flow rate of the refrigerant, the temperature difference (D
LW-DEL) is lower than the predetermined temperature -α, the electric expansion valve E is determined based on the absolute value of the temperature difference (DLW-DEL).
By increasing the opening EVW of V3, the flow rate of the refrigerant flowing from the hot water supply heat exchanger 15 side to the outlet side of the outdoor heat exchanger 13 is increased. Thus, the opening degree EVW of the electric expansion valve EV3 is obtained.
Is adjusted, the electric expansion valve E is connected to the refrigerant pipe 32 between the outlet side of the outdoor heat exchanger 13 and the electric expansion valve EV2.
At the junction A where the downstream side of V3 is connected, the state of supercooling of the refrigerant from the outdoor heat exchanger 13 and the state of the refrigerant from the hot water supply heat exchanger 15 are substantially the same. When the hot water supply operation is started during the cooling operation, the electric expansion valve EV1 is closed and the electric expansion valve EV3 is opened to a predetermined opening without stopping the compressor 11, so that the compressor 11, the hot water supply heat exchange. The refrigerant is circulated in the order of the heat exchanger 15, the electric expansion valve EV3, the electric expansion valve EV2, and the indoor heat exchanger 14, so that the hot water supply heat exchanger 1
Heat exchange is performed in step 5.
【0026】そして、冷房運転中に給湯運転を開始する
場合、図3に示すように、開いた電磁弁25と閉じた電
磁弁26はそのままの状態で、電磁弁21を閉じ、電動
膨張弁EV1を全閉する一方、電動膨張弁EV3を全開
にする。そうすると、上記圧縮機11から吐出された冷
媒は、給湯熱交換器15,電動膨張弁EV3,電動膨張弁
EV2室内熱交換器14およびアキュムレータ17の順
に循環して、給湯熱交換器15で冷媒を凝縮させて、貯
湯タンク16内の湯を沸かし、室内熱交換器14で冷媒
を蒸発させて、室内の冷房を行う。そして、上記貯湯タ
ンク16内の湯が目標温度に沸き上がると、電動膨張弁
EV1を全開にし、電動膨張弁EV3の開度を絞ると共
に、電磁弁21を開いて、冷房運転のみを行う。なお、
給湯運転のみを行う場合は、四路弁12を点線の切換位
置に切り換え、電動膨張弁EV1を全開にし、電動膨張
弁EV2を全閉にすると共に、電磁弁21,26を閉
じ、電磁弁25を開いて、圧縮機11から吐出された冷
媒を、給湯熱交換器15,電動膨張弁EV3,電動膨張弁
EV1および室外熱交換器13の順に循環させる。When the hot water supply operation is started during the cooling operation, as shown in FIG. 3, the electromagnetic valve 21 is closed while the opened electromagnetic valve 25 and the closed electromagnetic valve 26 are kept as they are, and the electric expansion valve EV1 is opened. Is fully closed, and the electric expansion valve EV3 is fully opened. Then, the refrigerant discharged from the compressor 11 circulates in the order of the hot water supply heat exchanger 15, the electric expansion valve EV3, the electric expansion valve EV2 indoor heat exchanger 14, and the accumulator 17, and circulates the refrigerant in the hot water supply heat exchanger 15. The condensed water is heated in the hot water storage tank 16 and the refrigerant is evaporated in the indoor heat exchanger 14 to cool the room. When the hot water in the hot water storage tank 16 rises to the target temperature, the electric expansion valve EV1 is fully opened, the opening degree of the electric expansion valve EV3 is reduced, and the solenoid valve 21 is opened to perform only the cooling operation. In addition,
When only the hot water supply operation is performed, the four-way valve 12 is switched to the switching position indicated by the dotted line, the electric expansion valve EV1 is fully opened, the electric expansion valve EV2 is fully closed, the electromagnetic valves 21 and 26 are closed, and the electromagnetic valve 25 is closed. Is opened, and the refrigerant discharged from the compressor 11 is circulated in the order of the hot water supply heat exchanger 15, the electric expansion valve EV3, the electric expansion valve EV1, and the outdoor heat exchanger 13.
【0027】したがって、冷房運転中に給湯運転を開始
する場合、冷房運転から冷房/給湯運転に切り換え前の
給湯熱交換器15側の冷媒回路の状態が高圧であるの
で、電磁弁等による冷媒回路の切換音の発生を防ぐこと
ができると共に、圧縮機11を停止させることなく、冷
房の速冷性を向上でき、給湯の立ち上がりの遅れを防止
することができる。また、上記圧縮機11の起動/停止
の回数を減らすと共に、給湯熱交換器15の凍結により
破損の虞れがなくなり、信頼性を向上することができ
る。Therefore, when the hot water supply operation is started during the cooling operation, the state of the refrigerant circuit on the hot water supply heat exchanger 15 side before switching from the cooling operation to the cooling / hot water supply operation is at a high pressure. Can be prevented from occurring, and the cooling speed of the cooling can be improved without stopping the compressor 11, and a delay in rising of hot water supply can be prevented. In addition, the number of times of starting / stopping of the compressor 11 is reduced, and there is no fear of breakage due to freezing of the hot water supply heat exchanger 15, so that reliability can be improved.
【0028】また、上記制御装置50によって、給湯熱
交換器15の出口側の冷媒温度DLWが室外熱交換器1
3の出口側の冷媒温度DELと略等しくなるように、制
御装置50により電動膨張弁EV3の開度EVWを制御
することによって、冷媒配管32の合流点Aにおいて、
室外熱交換器13側の冷媒と給湯熱交換器15側の冷媒
の過冷却の状態をほぼ同じにすることができ、給湯熱交
換器15からの流入冷媒により室外熱交換器13の出口
側の冷媒温度が上昇することがなく、冷房能力の低下を
防止することができる。The controller 50 also controls the refrigerant temperature DLW on the outlet side of the hot water supply heat exchanger 15 to reduce the outdoor heat exchanger 1 temperature.
By controlling the opening degree EVW of the electric expansion valve EV3 by the control device 50 so as to be substantially equal to the refrigerant temperature DEL on the outlet side of the refrigerant pipe 3 at the junction A of the refrigerant pipe 32,
The state of supercooling of the refrigerant on the outdoor heat exchanger 13 side and the refrigerant on the hot water supply heat exchanger 15 side can be made substantially the same, and the refrigerant flowing in from the hot water supply heat exchanger 15 closes the outlet side of the outdoor heat exchanger 13. It is possible to prevent a decrease in cooling capacity without increasing the refrigerant temperature.
【0029】また、上記制御装置50による電動膨張弁
EV3の簡単な制御によって、室外熱交換器13の出口
側の冷媒温度DELと給湯熱交換器15の出口側の冷媒
温度DLWとを略等しくすることができる。Further, by the simple control of the electric expansion valve EV3 by the control device 50, the refrigerant temperature DEL at the outlet of the outdoor heat exchanger 13 and the refrigerant temperature DLW at the outlet of the hot water supply heat exchanger 15 are made substantially equal. be able to.
【0030】上記実施の形態では、給湯運転を停止した
状態で冷房運転を行う場合に、上記室外熱交換器13の
出口側の冷媒温度と給湯熱交換器15の出口側の冷媒温
度が略等しくなるように、電動膨張弁EV3の開度を調
整したが、電動膨張弁の開度調整を一定にしてもよい。In the above embodiment, when the cooling operation is performed with the hot water supply operation stopped, the refrigerant temperature at the outlet side of the outdoor heat exchanger 13 and the refrigerant temperature at the outlet side of the hot water supply heat exchanger 15 are substantially equal. Although the opening degree of the electric expansion valve EV3 is adjusted so as to be as described above, the opening degree adjustment of the electric expansion valve may be fixed.
【0031】また、上記実施の形態では、上記四路弁1
2を切り換えて、冷暖房運転を行うヒートポンプ給湯機
について説明したが、四路弁のない冷房運転と給湯運転
を行うヒートポンプ給湯機についてこの発明を適用して
もよい。In the above embodiment, the four-way valve 1
Although the heat pump water heater that performs the cooling and heating operation by switching 2 has been described, the present invention may be applied to a heat pump water heater that performs the cooling operation and the hot water supply operation without the four-way valve.
【0032】また、上記実施の形態では、減圧器として
開度調整可能な電動膨張弁EV2を用いたが、減圧器を
用いてもよい。Further, in the above embodiment, the electric expansion valve EV2 whose opening can be adjusted is used as the decompressor, but a decompressor may be used.
【0033】なお、この発明のヒートポンプ給湯機にお
ける室内ユニットの数や給湯熱交換器の構造は、上記実
施の形態に限定されない。[0033] The number of indoor units and the structure of the hot water supply heat exchanger in the heat pump water heater of the present invention are not limited to the above embodiment.
【0034】[0034]
【発明の効果】以上より明らかなように、請求項1の発
明のヒートポンプ給湯機は、圧縮機,室外熱交換器,減圧
器および室内熱交換器が環状に接続された冷媒回路と、
上記圧縮機の吐出側に一端が接続された給湯熱交換器
と、上記給湯熱交換器の他端に一端が接続され、他端が
上記室外熱交換器と上記減圧器との間の冷媒配管に接続
された電動膨張弁とを備えたものである。As is apparent from the above description, the heat pump water heater according to the first aspect of the present invention comprises a refrigerant circuit in which a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are connected in a ring.
A hot water supply heat exchanger having one end connected to the discharge side of the compressor, and one end connected to the other end of the hot water supply heat exchanger, and the other end connected to a refrigerant pipe between the outdoor heat exchanger and the decompressor. And an electric expansion valve connected to the motor.
【0035】したがって、請求項1の発明のヒートポン
プ給湯機によれば、給湯運転を停止した状態で冷房運転
を行うときは、上記電動膨張弁の開度を絞って、電動膨
張弁から圧縮機の吐出側までの給湯熱交換器側の冷媒回
路を高圧にすることによって、冷房運転状態から冷房と
給湯の両方を行う冷房/給湯運転に切り換えるとき、冷
媒回路の切換音の発生を防ぐことができると共に、圧縮
機を停止させる必要がなく、冷房の速冷性を向上するこ
とができ、給湯の立ち上がりの遅れを防止することがで
きる。また、上記圧縮機の起動/停止の回数を減らすと
共に、給湯熱交換器の凍結による破損の虞れがなくな
り、高い信頼性を得ることができる。Therefore, according to the heat pump water heater of the first aspect of the present invention, when performing the cooling operation in a state where the hot water supply operation is stopped, the opening degree of the electric expansion valve is reduced, and the opening of the electric expansion valve is reduced. By setting the refrigerant circuit on the hot water supply heat exchanger side up to the discharge side to a high pressure, it is possible to prevent generation of a switching noise of the refrigerant circuit when switching from the cooling operation state to the cooling / hot water supply operation for performing both cooling and hot water supply. At the same time, there is no need to stop the compressor, and the rapid cooling of the cooling can be improved, and a delay in rising of hot water supply can be prevented. In addition, the number of times the compressor is started / stopped is reduced, and there is no possibility of damage due to freezing of the hot water supply heat exchanger, so that high reliability can be obtained.
【0036】また、請求項2の発明のヒートポンプ給湯
機は、請求項1のヒートポンプ給湯機において、給湯運
転を停止した状態で冷房運転を行う場合、上記室外熱交
換器の出口側の冷媒温度と上記給湯熱交換器の出口側の
冷媒温度とが略等しくなるように、制御装置により上記
電動膨張弁の開度を制御するので、室外熱交換器の出口
側と減圧器との間の冷媒配管に電動膨張弁の下流側が接
続された合流点において、室外熱交換器側からの冷媒と
給湯熱交換器側からの冷媒の過冷却の状態をほぼ同じに
して、室外熱交換器の出口側の冷媒温度が給湯熱交換器
側から流入する冷媒により上昇することがなく、冷房能
力の低下を防止することができる。In the heat pump water heater according to the second aspect of the present invention, in the heat pump water heater according to the first aspect, when performing the cooling operation in a state where the hot water supply operation is stopped, the temperature of the refrigerant at the outlet side of the outdoor heat exchanger is reduced. Since the opening of the electric expansion valve is controlled by the control device so that the refrigerant temperature on the outlet side of the hot water supply heat exchanger becomes substantially equal, the refrigerant pipe between the outlet side of the outdoor heat exchanger and the pressure reducer is controlled. At the junction where the downstream side of the electric expansion valve is connected, the state of supercooling of the refrigerant from the outdoor heat exchanger side and the refrigerant from the hot water supply heat exchanger side is almost the same, and the outlet side of the outdoor heat exchanger is The refrigerant temperature does not rise due to the refrigerant flowing from the hot water supply heat exchanger side, and a decrease in the cooling capacity can be prevented.
【0037】また、請求項3の発明のヒートポンプ給湯
機は、請求項2のヒートポンプ給湯機において、第2温
度センサにより検出された給湯熱交換器の出口側の冷媒
温度が第1温度センサにより検出された室外熱交換器の
出口側の冷媒温度よりも高く、かつ、その給湯熱交換器
の出口側の冷媒温度と室外熱交換器の出口側の冷媒温度
との温度差が第1所定温度よりも高いと制御装置の第1
温度判別部が判別すると、電動膨張弁制御部は、電動膨
張弁の開度を小さくし、給湯熱交換器側から室外熱交換
器の出口側に電動膨張弁を介して流れる冷媒流量を減ら
して、給湯熱交換器の出口側の冷媒温度を低下させる一
方、上記第2温度センサにより検出された給湯熱交換器
の出口側の冷媒温度が第1温度センサにより検出された
室外熱交換器の出口側の冷媒温度よりも低く、かつ、そ
の給湯熱交換器の出口側の冷媒温度と室外熱交換器の出
口側の冷媒温度との温度差が第2所定温度よりも低いと
制御装置の第2温度判別部が判別すると、電動膨張弁制
御部は、電動膨張弁の開度を大きくし、給湯熱交換器側
から室外熱交換器の出口側に電動膨張弁を介して流れる
冷媒流量を増やして、給湯熱交換器の出口側の冷媒温度
を上昇させる。したがって、上記電動膨張弁の簡単な制
御によって、室外熱交換器の出口側の冷媒温度と給湯熱
交換器の出口側の冷媒温度とを略等しくすることができ
る。According to a third aspect of the present invention, in the heat pump water heater of the second aspect, the refrigerant temperature at the outlet of the hot water supply heat exchanger detected by the second temperature sensor is detected by the first temperature sensor. The temperature difference between the refrigerant temperature at the outlet side of the hot water supply heat exchanger and the refrigerant temperature at the outlet side of the outdoor heat exchanger is higher than the first predetermined temperature. Is too high and the first
When the temperature determination unit determines, the electric expansion valve control unit reduces the opening degree of the electric expansion valve and reduces the flow rate of refrigerant flowing from the hot water supply heat exchanger side to the outlet side of the outdoor heat exchanger via the electric expansion valve. The temperature of the refrigerant at the outlet of the hot water supply heat exchanger is lowered, and the temperature of the refrigerant at the outlet of the hot water supply heat exchanger detected by the second temperature sensor is detected by the first temperature sensor. If the temperature difference between the refrigerant temperature on the outlet side of the hot water supply heat exchanger and the refrigerant temperature on the outlet side of the outdoor heat exchanger is lower than a second predetermined temperature, the second temperature of the control device is lower than the second predetermined temperature. When the temperature determination unit determines, the electric expansion valve control unit increases the opening degree of the electric expansion valve and increases the flow rate of the refrigerant flowing from the hot water supply heat exchanger side to the outlet side of the outdoor heat exchanger via the electric expansion valve. Then, the refrigerant temperature at the outlet side of the hot water supply heat exchanger is increased. Therefore, by the simple control of the electric expansion valve, the refrigerant temperature on the outlet side of the outdoor heat exchanger and the refrigerant temperature on the outlet side of the hot water supply heat exchanger can be made substantially equal.
【図1】 図1はこの発明の実施の一形態のヒートポン
プ給湯機の冷房運転時の状態に示す回路図である。FIG. 1 is a circuit diagram showing a state of a heat pump water heater according to an embodiment of the present invention during a cooling operation.
【図2】 図2は上記ヒートポンプ給湯機の制御装置の
フローチャートである。FIG. 2 is a flowchart of a control device of the heat pump water heater.
【図3】 図3は上記ヒートポンプ給湯機の冷房/給湯
運転時の状態に示す回路図である。FIG. 3 is a circuit diagram showing a state of the heat pump water heater during a cooling / hot water supply operation.
【図4】 図4は従来のヒートポンプ給湯機の回路図で
ある。FIG. 4 is a circuit diagram of a conventional heat pump water heater.
1…室外ユニット、2…室内ユニット、3…給湯タンク
ユニット、11…圧縮機、12…四路弁、13…室外熱
交換器、14…室内熱交換器、15…給湯熱交換器、1
6…給湯タンク、17…アキュムレータ、21,25,2
6電磁弁、50…制御装置、51,52…サーミスタ、
EV1,EV2,EV3…電動膨張弁。DESCRIPTION OF SYMBOLS 1 ... Outdoor unit, 2 ... Indoor unit, 3 ... Hot water supply tank unit, 11 ... Compressor, 12 ... Four-way valve, 13 ... Outdoor heat exchanger, 14 ... Indoor heat exchanger, 15 ... Hot water supply heat exchanger, 1
6 hot water supply tank, 17 accumulator, 21, 25, 2
6 solenoid valves, 50: control device, 51, 52: thermistor,
EV1, EV2, EV3: Electric expansion valves.
Claims (3)
器(EV2)および室内熱交換器(14)が環状に接続され
た冷媒回路と、 上記圧縮機(11)の吐出側に一端が接続された給湯熱交
換器(15)と、 上記給湯熱交換器(15)の他端に一端が接続され、他端
が上記室外熱交換器(13)と上記減圧器(EV2)との間
の冷媒配管(32)に接続された電動膨張弁(EV3)とを
備えたことを特徴とするヒートポンプ給湯機。1. A refrigerant circuit in which a compressor (11), an outdoor heat exchanger (13), a pressure reducer (EV2) and an indoor heat exchanger (14) are connected in a ring shape, and a discharge of the compressor (11). A hot water supply heat exchanger (15) having one end connected to the other side, one end connected to the other end of the hot water supply heat exchanger (15), and the other end connected to the outdoor heat exchanger (13) and the pressure reducer (EV2). And a motor-operated expansion valve (EV3) connected to the refrigerant pipe (32).
おいて、 給湯運転を停止した状態で冷房運転を行う場合、上記室
外熱交換器(13)の出口側の冷媒温度と上記給湯熱交換
器(15)の出口側の冷媒温度とが略等しくなるように上
記電動膨張弁(EV3)の開度を制御する制御装置(50)
を備えたことを特徴とするヒートポンプ給湯機。2. The heat pump water heater according to claim 1, wherein when performing the cooling operation in a state where the hot water supply operation is stopped, the temperature of the refrigerant at the outlet side of the outdoor heat exchanger and the hot water supply heat exchanger. A control device (50) for controlling the opening of the electric expansion valve (EV3) so that the refrigerant temperature on the outlet side of the item (15) becomes substantially equal.
A heat pump water heater comprising:
おいて、 上記室外熱交換器(13)の出口側の冷媒温度を検出する
第1温度センサ(51)と、 上記給湯熱交換器(15)の出口側の冷媒温度を検出する
第2温度センサ(52)とを備えて、 上記制御装置(50)は、 上記第2温度センサ(52)により検出された上記給湯熱
交換器(15)の出口側の冷媒温度が上記第1温度センサ
(51)により検出された上記室外熱交換器(13)の出口
側の冷媒温度よりも高く、かつ、上記給湯熱交換器(1
5)の出口側の冷媒温度と上記室外熱交換器(13)の出
口側の冷媒温度との温度差が第1所定温度よりも高いか
否かを判別する第1温度判別部(50a)と、 上記第2温度センサ(52)により検出された上記給湯熱
交換器(15)の出口側の冷媒温度が上記第1温度センサ
(51)により検出された上記室外熱交換器(13)の出口
側の冷媒温度よりも低く、かつ、上記給湯熱交換器(1
5)の出口側の冷媒温度と上記室外熱交換器(13)の出
口側の冷媒温度との温度差が第2所定温度よりも低いか
否かを判別する第2温度判別部(50b)と、 上記給湯熱交換器(15)の出口側の冷媒温度が上記室外
熱交換器(13)の出口側の冷媒温度よりも高く、かつ、
上記給湯熱交換器(15)の出口側の冷媒温度と上記室外
熱交換器(13)の出口側の冷媒温度との温度差が第1所
定温度よりも高いと上記第1温度判別部(50a)が判別
すると、上記電動膨張弁(EV3)の開度を小さくする一
方、上記給湯熱交換器(15)の出口側の冷媒温度が上記
室外熱交換器(13)の出口側の冷媒温度よりも低く、か
つ、上記給湯熱交換器(15)の出口側の冷媒温度と上記
室外熱交換器(13)の出口側の冷媒温度との温度差が第
2所定温度よりも低いと上記第2温度判別部(50b)が
判別すると、上記電動膨張弁(EV3)の開度を大きくす
る電動膨張弁制御部(50c)とを備えたことを特徴とす
るヒートポンプ給湯機。3. The heat pump water heater according to claim 2, wherein a first temperature sensor (51) for detecting a refrigerant temperature at an outlet side of the outdoor heat exchanger (13), and the hot water heat exchanger (15). A second temperature sensor (52) for detecting a refrigerant temperature on an outlet side of the hot water supply heat exchanger (15) detected by the second temperature sensor (52). The refrigerant temperature at the outlet side is the first temperature sensor
(51) is higher than the refrigerant temperature at the outlet side of the outdoor heat exchanger (13), and the hot water supply heat exchanger (1
A first temperature discriminator (50a) for discriminating whether or not a temperature difference between the refrigerant temperature on the outlet side of 5) and the refrigerant temperature on the outlet side of the outdoor heat exchanger (13) is higher than a first predetermined temperature; The refrigerant temperature at the outlet of the hot water supply heat exchanger (15) detected by the second temperature sensor (52) is equal to the first temperature sensor.
(51) is lower than the refrigerant temperature at the outlet side of the outdoor heat exchanger (13), and the hot water supply heat exchanger (1
A second temperature determination unit (50b) that determines whether a temperature difference between the refrigerant temperature on the outlet side of 5) and the refrigerant temperature on the outlet side of the outdoor heat exchanger (13) is lower than a second predetermined temperature. The refrigerant temperature at the outlet of the hot water supply heat exchanger (15) is higher than the refrigerant temperature at the outlet of the outdoor heat exchanger (13), and
If the temperature difference between the refrigerant temperature at the outlet side of the hot water supply heat exchanger (15) and the refrigerant temperature at the outlet side of the outdoor heat exchanger (13) is higher than a first predetermined temperature, the first temperature discrimination section (50a ) Is determined, the opening degree of the electric expansion valve (EV3) is reduced, while the refrigerant temperature at the outlet side of the hot water supply heat exchanger (15) is lower than the refrigerant temperature at the outlet side of the outdoor heat exchanger (13). And the temperature difference between the refrigerant temperature at the outlet of the hot water supply heat exchanger (15) and the refrigerant at the outlet of the outdoor heat exchanger (13) is lower than a second predetermined temperature. A heat pump water heater comprising an electric expansion valve control section (50c) for increasing the opening of the electric expansion valve (EV3) when the temperature judgment section (50b) judges.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9030154A JP3060980B2 (en) | 1997-02-14 | 1997-02-14 | Heat pump water heater |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9030154A JP3060980B2 (en) | 1997-02-14 | 1997-02-14 | Heat pump water heater |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10227536A true JPH10227536A (en) | 1998-08-25 |
JP3060980B2 JP3060980B2 (en) | 2000-07-10 |
Family
ID=12295845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9030154A Expired - Fee Related JP3060980B2 (en) | 1997-02-14 | 1997-02-14 | Heat pump water heater |
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Country | Link |
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JP (1) | JP3060980B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101192346B1 (en) | 2010-04-22 | 2012-10-18 | 엘지전자 주식회사 | Heat pump type speed heating apparatus |
JP2013210155A (en) * | 2012-03-30 | 2013-10-10 | Daikin Industries Ltd | Refrigerating device |
CN105318599A (en) * | 2014-06-13 | 2016-02-10 | 财团法人工业技术研究院 | Cold and hot multifunctional heat pump equipment |
JP2017020681A (en) * | 2015-07-08 | 2017-01-26 | ダイキン工業株式会社 | Air conditioning/hot water supply system |
-
1997
- 1997-02-14 JP JP9030154A patent/JP3060980B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101192346B1 (en) | 2010-04-22 | 2012-10-18 | 엘지전자 주식회사 | Heat pump type speed heating apparatus |
JP2013210155A (en) * | 2012-03-30 | 2013-10-10 | Daikin Industries Ltd | Refrigerating device |
CN105318599A (en) * | 2014-06-13 | 2016-02-10 | 财团法人工业技术研究院 | Cold and hot multifunctional heat pump equipment |
JP2017020681A (en) * | 2015-07-08 | 2017-01-26 | ダイキン工業株式会社 | Air conditioning/hot water supply system |
Also Published As
Publication number | Publication date |
---|---|
JP3060980B2 (en) | 2000-07-10 |
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