JP2000118231A - Refrigerating cycle - Google Patents
Refrigerating cycleInfo
- Publication number
- JP2000118231A JP2000118231A JP10294920A JP29492098A JP2000118231A JP 2000118231 A JP2000118231 A JP 2000118231A JP 10294920 A JP10294920 A JP 10294920A JP 29492098 A JP29492098 A JP 29492098A JP 2000118231 A JP2000118231 A JP 2000118231A
- Authority
- JP
- Japan
- Prior art keywords
- evaporator
- refrigerant
- flow path
- sub
- downstream
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/323—Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、１つの冷凍サイク
ル内に並列に配置された複数の蒸発器を備えた冷凍サイ
クルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle having a plurality of evaporators arranged in parallel in one refrigeration cycle.
【０００２】[0002]
【従来の技術】図５は、車室容量の大きな車両に用いら
れる、エバポレータ（蒸発器）を２個備えたデュアルタ
イプの車両用空調装置の冷凍サイクルを示す図である。
この冷凍サイクルにおいて、車両の前席側に冷風を送る
ための主エバポレータ４ａと車両の後席側側に冷風を送
るための副エバポレータ４ｂとが共に稼動している場合
には、コンプレサ１で圧縮され高温高圧となった冷媒
は、コンデンサ２で冷却されて凝縮し、受液器５を通っ
た後、分岐点７において２つの流路７ａ，７ｂに分か
れ、主エバポレータ４ａ側と副エバポレータ４ｂ側とに
それぞれ送られる。上記凝縮された冷媒は、膨張弁３
ａ，３ｂを通過する際に急激に膨張させられ低温低圧と
なる。この低温低圧の冷媒は、主エバポレータ４ａ及び
副エバポレータ４ｂ内で気化された後、主エバポレータ
４ａと副エバポレータ４ｂの出口側の冷媒流路８ａ，８
ｂが再び合体する分岐点８において合流し、コンプレサ
１に吸引される。2. Description of the Related Art FIG. 5 is a diagram showing a refrigeration cycle of a dual-type vehicle air conditioner provided with two evaporators, which is used for a vehicle having a large cabin capacity.
In this refrigeration cycle, when the main evaporator 4a for sending cool air to the front seat side of the vehicle and the sub-evaporator 4b for sending cool air to the rear seat side of the vehicle are both operating, the compressor 1 compresses. The high-temperature and high-pressure refrigerant is cooled and condensed by the condenser 2, passes through the receiver 5, and is divided into two flow paths 7 a and 7 b at a branch point 7, where the main evaporator 4 a and the sub-evaporator 4 b And sent to each. The condensed refrigerant is supplied to the expansion valve 3
When it passes through a and 3b, it is rapidly expanded and becomes low temperature and low pressure. After the low-temperature and low-pressure refrigerant is vaporized in the main evaporator 4a and the sub-evaporator 4b, the refrigerant flow paths 8a and 8 on the outlet side of the main evaporator 4a and the sub-evaporator 4b are formed.
b merge again at the junction 8 where they merge, and are sucked into the compressor 1.
【０００３】ところで、上記冷凍サイクルにおいて、上
記主エバポレータ４ａのみを稼動させ、車両の前席側の
みに冷風を送るようにした場合には、副エバポレータ４
ｂ側に液化した状態の冷媒が滞留する、いわゆる寝込み
といわれる現象が起こる。エバポレータは、冷媒の流路
に対して容積が大きいので、冷媒が副エバポレータ４ｂ
内に寝込むことにより、主エバポレータ４ａの冷凍サイ
クルを循環する冷媒及び冷媒に混合された潤滑油が不足
し、コンプレサ１が潤滑不良になるなど、コンプレサ１
の信頼性が低下するという問題点があった。そこで、図
６に示すように、主エバポレータ４ａ側と副エバポレー
タ４ｂ側とが連結されている上流側の冷媒流路７ｂに、
上記冷媒流路７ｂを開閉する電磁弁６を設け、副エバポ
レータ４ｂを休止させる場合には、上記電磁弁６を閉じ
て上記冷媒流路７ｂからの凝縮された冷媒の供給を停止
させることにより、副エバポレータ４ｂを閉鎖状態と
し、冷媒を主エバポレータ４ａ側のみに送るようにして
いる。なお、同図の破線で示すように、電磁弁６を、主
エバポレータ４ａ側と副エバポレータ４ｂ側とが連結さ
れている下流側の冷媒流路８ｂに設けて副エバポレータ
４ｂを閉鎖状態としてもよい。In the above-mentioned refrigerating cycle, when only the main evaporator 4a is operated and cold air is sent only to the front seat side of the vehicle, the sub-evaporator 4a is not operated.
A phenomenon called so-called stagnation occurs in which the liquefied refrigerant stays on the b side. Since the evaporator has a large volume relative to the flow path of the refrigerant, the refrigerant is supplied to the sub-evaporator 4b.
When the compressor 1 is laid inside, the refrigerant circulating through the refrigeration cycle of the main evaporator 4a and the lubricating oil mixed with the refrigerant run short, and the compressor 1 becomes poorly lubricated.
There is a problem that the reliability of the device is reduced. Therefore, as shown in FIG. 6, a refrigerant flow path 7b on the upstream side where the main evaporator 4a side and the sub-evaporator 4b side are connected,
When the electromagnetic valve 6 that opens and closes the refrigerant flow path 7b is provided and the sub-evaporator 4b is stopped, by stopping the supply of the condensed refrigerant from the refrigerant flow path 7b by closing the electromagnetic valve 6, The sub-evaporator 4b is closed, and the refrigerant is sent only to the main evaporator 4a. As shown by the broken line in the figure, the solenoid valve 6 may be provided in the downstream refrigerant flow path 8b where the main evaporator 4a side and the sub evaporator 4b side are connected to close the sub evaporator 4b. .
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来例では、電磁弁６は、冷媒流路７ｂ，８ｂの一方にし
か設けられていないため、副エバポレータ４ｂの休止時
に、副エバポレータ４ｂ側を十分に閉鎖状態とすること
ができなかった。例えば、電磁弁６を冷媒流路７ｂのみ
に設けた場合には、主エバポレータ４ａで気化された冷
媒が冷媒流路８ｂから副エバポレータ４ｂ側に浸入して
液化し、寝込みを起こしてしまう。また、電磁弁６を冷
媒流路８ｂのみに設けた場合には、凝縮された冷媒が冷
媒流路７ｂから膨張弁３ｂを通って副エバポレータ４ｂ
内に浸入してしまうので、主エバポレータ４ａの冷凍サ
イクルでの冷媒不足及び潤滑油不足を十分抑制すること
ができないという問題点があった。However, in the above-mentioned conventional example, the solenoid valve 6 is provided only in one of the refrigerant flow paths 7b and 8b, so that when the sub-evaporator 4b is stopped, the sub-evaporator 4b side is sufficiently provided. Could not be closed. For example, when the solenoid valve 6 is provided only in the refrigerant flow path 7b, the refrigerant vaporized in the main evaporator 4a enters the sub-evaporator 4b side from the refrigerant flow path 8b to be liquefied, causing stagnation. When the solenoid valve 6 is provided only in the refrigerant flow path 8b, the condensed refrigerant flows from the refrigerant flow path 7b through the expansion valve 3b to the sub evaporator 4b.
Therefore, there is a problem that the shortage of the refrigerant and the shortage of the lubricating oil in the refrigeration cycle of the main evaporator 4a cannot be sufficiently suppressed.
【０００５】本発明は、従来の問題点に鑑みてなされた
もので、並列に配置された複数の蒸発器を備えた冷凍サ
イクルにおいて、特定の蒸発器が休止している場合で
も、冷媒や潤滑油の寝込みを防止し、圧縮機の信頼性を
向上させることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and in a refrigeration cycle having a plurality of evaporators arranged in parallel, even if a specific evaporator is at rest, the refrigerant or lubrication is not possible. An object of the present invention is to prevent oil stagnation and improve the reliability of a compressor.
【０００６】[0006]
【課題を解決するための手段】本発明の請求項１に記載
の冷凍サイクルは、並列に配置された複数の蒸発器の
内、特定の蒸発器の上流側と下流側との双方に冷媒の流
路を開閉する電磁弁を設けたものである。According to a first aspect of the present invention, there is provided a refrigeration cycle comprising a plurality of evaporators arranged in parallel, wherein a refrigerant is supplied to both an upstream side and a downstream side of a specific evaporator. An electromagnetic valve for opening and closing the flow path is provided.
【０００７】請求項２に記載の冷凍サイクルは、上記特
定の蒸発器に対する冷媒の供給を停止する場合には、上
流側の電磁弁を閉じた後に下流側の電磁弁を閉じるよう
にしたものである。In the refrigeration cycle according to the present invention, when the supply of the refrigerant to the specific evaporator is stopped, the downstream electromagnetic valve is closed after the upstream electromagnetic valve is closed. is there.
【０００８】請求項３に記載の冷凍サイクルは、上記電
磁弁の一方あるいは双方を、リリーフ弁機構を備えた電
磁弁から構成したものである。According to a third aspect of the present invention, in the refrigeration cycle, one or both of the solenoid valves is constituted by a solenoid valve having a relief valve mechanism.
【０００９】請求項４に記載の冷凍サイクルは、上記電
磁弁の一方あるいは双方の内部にバイパス流路を設ける
とともに、上記リリーフ弁機構を上記バイパス流路内に
設けたものである。In a refrigeration cycle according to a fourth aspect of the present invention, a bypass passage is provided inside one or both of the solenoid valves, and the relief valve mechanism is provided in the bypass passage.
【００１０】請求項５に記載の冷凍サイクルは、上流側
の電磁弁と下流側の電磁弁との間の冷媒流路に、冷媒を
上流側の電磁弁の上流側または下流側の電磁弁の下流側
に開放するバイパス流路を設けるとともに、このバイパ
ス流路にリリーフ弁を設けたものである。[0010] In the refrigeration cycle according to the present invention, the refrigerant is supplied to the refrigerant flow path between the upstream solenoid valve and the downstream solenoid valve through the upstream or downstream solenoid valve of the upstream solenoid valve. In addition to the provision of a bypass passage open to the downstream side, a relief valve is provided in the bypass passage.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面に基づき説明する。図１は本発明の実施の形態
に係わる冷凍サイクルのを示す図で、この冷凍サイクル
は、車室容量の大きな車両に用いられる、エバポレータ
（蒸発器）を２個備えたデュアルタイプの車両用空調装
置に用いられる。同図において、１は低圧の冷媒を圧縮
するコンプレサ（圧縮機）、２は圧縮され高温高圧の気
体となった冷媒を冷却し凝縮させるコンデンサ（凝縮
器）、３ａ，３ｂは上記冷媒を急激に膨張させ冷媒を低
温低圧の液体とする膨張弁、４ａ，４ｂは低温となった
冷媒と周囲の空気とを図外の熱交換器を介して熱交換
し、上記空気を冷却するとともに上記冷媒を気化させる
エバポレータ（蒸発器）で、４ａは車両の前席側を冷房
するための主エバポレータ、４ｂは車両の後席側側を冷
房するための副エバポレータである。また、５はコンプ
レサ１からの凝縮された冷媒を一時貯蔵する受液器であ
る。上記２つのエバポレータ４ａ，４ｂは、コンプレサ
１に対して並列に配置されており、上記受液器５からの
冷媒の流路は、分岐点７において、主エバポレータ４ａ
側への流路７ａと副エバポレータ４ｂ側への流路７ｂと
に分離し、分岐点８において、主エバポレータ４ａの出
口側からの流路８ａと副エバポレータ４ｂの出口側から
の流路８ｂとが合流するように構成されている。また、
上記分岐点７と上記膨張弁３ｂとの間の冷媒流路７ｂに
は、上記冷媒流路７ｂを開閉する第１の電磁弁（以下、
上流側の電磁弁という）１１が、上記副エバポレータ４
ｂの出口側と上記合流点８との間の冷媒流路８ｂには上
記冷媒流路８ｂを開閉する第２の電磁弁（以下、下流側
の電磁弁という）１２が設けられている。デュアルタイ
プの車両用空調装置においては、通常、車両の前席側の
みの冷房と、前席側と後席側の双方の冷房を行う場合が
多く、後席側のみを冷房する例は少ない。したがって、
主エバポレータ４ａは冷房時には常に稼動しているが、
副エバポレータ４ｂは、車両の前席側のみの冷房の場合
には休止される特定のエバポレータ（蒸発器）に相当す
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a refrigeration cycle according to an embodiment of the present invention. This refrigeration cycle is used for a vehicle having a large cabin capacity, and is a dual-type vehicle air conditioner having two evaporators. Used for equipment. In the figure, 1 is a compressor (compressor) for compressing a low-pressure refrigerant, 2 is a condenser (condenser) for cooling and condensing the refrigerant that has been compressed and turned into a high-temperature and high-pressure gas, and 3a and 3b rapidly cool the refrigerant. The expansion valves 4a and 4b expand the refrigerant into a low-temperature and low-pressure liquid by exchanging heat between the low-temperature refrigerant and the surrounding air through a heat exchanger (not shown) to cool the air and to remove the refrigerant. An evaporator (evaporator) 4a is a main evaporator for cooling the front seat side of the vehicle, and 4b is a sub-evaporator for cooling the rear seat side of the vehicle. Reference numeral 5 denotes a liquid receiver for temporarily storing the condensed refrigerant from the compressor 1. The two evaporators 4 a and 4 b are arranged in parallel with the compressor 1, and the flow path of the refrigerant from the liquid receiver 5 at the branch point 7 is the main evaporator 4 a
At the branch point 8, the flow path 8a from the outlet side of the main evaporator 4a and the flow path 8b from the outlet side of the sub-evaporator 4b. Are configured to merge. Also,
A first solenoid valve (hereinafter, referred to as a valve) that opens and closes the refrigerant flow path 7b is provided in the refrigerant flow path 7b between the branch point 7 and the expansion valve 3b.
The upstream evaporator 4 is called an upstream electromagnetic valve.
A second electromagnetic valve (hereinafter, referred to as a downstream electromagnetic valve) 12 that opens and closes the refrigerant flow path 8b is provided in the refrigerant flow path 8b between the outlet side of b and the junction 8. In a dual-type air conditioner for a vehicle, cooling only on the front seat side of the vehicle and cooling on both the front seat side and the rear seat side are usually performed in many cases, and there are few examples of cooling only on the rear seat side. Therefore,
The main evaporator 4a is always operating during cooling,
The sub-evaporator 4b corresponds to a specific evaporator (evaporator) that is stopped in the case of cooling only on the front seat side of the vehicle.
【００１２】次に、本実施の形態の冷凍サイクルで、主
エバポレータ４ａのみを稼動させ、副エバポレータ４ｂ
を休止（リア側Ａ／Ｃオフ）させて、車両の前席側のみ
に冷風を送るようにした場合の動作について説明する。
なお、上記冷凍サイクルにおいて、主エバポレータ４ａ
と副エバポレータ４ｂとが共に稼動している場合の動作
は従来例と同様であるので説明を省略する。特定の蒸発
器である副エバポレータ４ｂに対する冷媒の供給を停止
する場合には、まず、上流側の電磁弁１１を閉鎖し、副
エバポレータ４ｂ側への凝縮された冷媒の供給を停止
し、その後、約２〜３分経過してから下流側の電磁弁１
２を閉鎖する。この処理により、副エバポレータ４ｂ内
に供給されてた冷媒は、冷媒流路８ｂを介してコンプレ
ッサ１により吸引されコンプレッサ１に戻されるので、
副エバポレータ４ｂ内に残留する冷媒の量が低減され、
寝込み防止することができる。また、下流側の電磁弁１
２の閉鎖後は、主エバポレータ４ａで気化された冷媒が
冷媒流路８ｂから副エバポレータ４ｂ側に浸入すること
がないので、副エバポレータ４ｂ内の寝込みを確実に防
止することができ、コンプレッサ１の信頼性を向上させ
ることができる。なお、上記処理により、副エバポレー
タ４ｂ内に残留する冷媒の量を少なくできるので、電磁
弁１１，１２を閉鎖しても、温度上昇による副エバポレ
ータ４ｂ側の圧力上昇も少ない。Next, in the refrigeration cycle of the present embodiment, only the main evaporator 4a is operated and the sub-evaporator 4b is operated.
Will be described when the vehicle is stopped (rear A / C off) so as to send cool air only to the front seat side of the vehicle.
In the refrigerating cycle, the main evaporator 4a
The operation when both the sub-evaporator 4b and the sub-evaporator 4b are operating is the same as that of the conventional example, and the description is omitted. When stopping the supply of the refrigerant to the sub-evaporator 4b which is a specific evaporator, first, the electromagnetic valve 11 on the upstream side is closed, and the supply of the condensed refrigerant to the sub-evaporator 4b is stopped. After about 2 to 3 minutes have passed, the downstream solenoid valve 1
2 is closed. By this processing, the refrigerant supplied into the sub-evaporator 4b is sucked by the compressor 1 through the refrigerant flow passage 8b and returned to the compressor 1, so that
The amount of the refrigerant remaining in the sub-evaporator 4b is reduced,
Sleeping can be prevented. Also, the downstream solenoid valve 1
After the closure of the compressor 2, since the refrigerant vaporized by the main evaporator 4a does not enter the sub-evaporator 4b side from the refrigerant flow path 8b, stagnation in the sub-evaporator 4b can be reliably prevented, and the compressor 1 Reliability can be improved. In addition, since the amount of the refrigerant remaining in the sub-evaporator 4b can be reduced by the above-described processing, even if the solenoid valves 11 and 12 are closed, the pressure increase on the sub-evaporator 4b side due to the temperature rise is small.
【００１３】ところで、高温下でかつ空調装置を停止し
た状態で車両を放置した場合には、車室内の温度が上昇
し、エバポレータ４ａ，４ｂ内の冷媒が蒸発膨張する
が、主エバポレータ４ａ側には、外気温にさらされてい
るコンデンサ２や受液器５等があるため、主エバポレー
タ４ａ内の冷媒が蒸発しても主エバポレータ４ａ側の圧
力はあまり上昇しない。しかし、副エバポレータ４ｂ側
では、副エバポレータ４ｂの上流側と下流側との双方が
電磁弁１１，１２により閉鎖されているため、副エバポ
レータ４ｂ内に残留する冷媒の量が少ないとはいえ、車
両の放置状態等によっては、上記冷媒の蒸発により、副
エバポレータ４ｂ側の圧力が上昇して副エバポレータ４
ｂの耐圧を越えてしまい、副エバポレータ４ｂが破裂す
る危険性がある。そこで、本実施の形態においては、後
述するように、上流側の電磁弁１１または下流側の電磁
弁１２の一方または双方にリリーフ弁機構を設けて、副
エバポレータ４ｂの破裂を防止するようにしている。When the vehicle is left at a high temperature and with the air conditioner stopped, the temperature in the passenger compartment rises and the refrigerant in the evaporators 4a and 4b evaporates and expands. Since there is the condenser 2 and the liquid receiver 5 exposed to the outside air temperature, the pressure on the main evaporator 4a side does not increase so much even if the refrigerant in the main evaporator 4a evaporates. However, on the side of the sub-evaporator 4b, both the upstream side and the downstream side of the sub-evaporator 4b are closed by the electromagnetic valves 11 and 12, so that the amount of the refrigerant remaining in the sub-evaporator 4b is small. In some cases, the pressure on the side of the sub-evaporator 4b increases due to the evaporation of the refrigerant, and
b, the sub evaporator 4b may be ruptured. Therefore, in the present embodiment, as described later, a relief valve mechanism is provided on one or both of the upstream solenoid valve 11 and the downstream solenoid valve 12 so as to prevent the sub-evaporator 4b from bursting. I have.
【００１４】図２は、リリーフ弁機構を備えた電磁弁と
して、下流側の電磁弁１２を例にとり、流路を一般化し
て説明する。流路９と流路１０との間に設けられた電磁
弁１２は、電磁コイル１３中に一端に弁体１４を直結し
た可動鉄心１５を配置し、上記電磁コイル１３に流れる
励磁電流を制御することにより、上記弁体１４を上下さ
せ流路９と流路１０とを連結または分離するものであ
る。上記可動鉄心１５の上記弁体１４と反対側には、上
記可動鉄心１５を閉側（同図の下方）に付勢するバネ１
６が取付けられている。このバネ１６は、図３に示すよ
うに、流路１０の内圧が所定圧力以上に高くなると上記
内圧によって縮み、そのため弁体１４が上方に持ち上げ
られて流路１０内の流体が流路９内に流れ込むように設
計されている。すなわち、この電磁弁１２は、リリーフ
弁（安全弁）の機能を有しており、上方に持ち上げられ
た弁体１４と流路１０との隙間の空間が流路９，１０内
の流体のバイパス流路を形成する。したがって、上記流
路９を冷媒流路８ｂの主エバポレータ４ａ側、流路１０
を副エバポレータ４ｂ側とすれば、副エバポレータ４ｂ
側の圧力が上昇し、電磁弁１２のリリーフ弁機構が作動
する所定の圧力に達した場合には、電磁弁１２の弁体１
４が持ち上げられ、副エバポレータ４ｂ側の冷媒が主エ
バポレータ４ａ側に流れ込むので、副エバポレータ４ｂ
側の圧力は減少し、副エバポレータ４ｂの破裂を防止す
ることができる。なお、上記リリーフ弁機構が作動する
所定の圧力は、副エバポレータ４ｂの耐圧の約１／２〜
１／３程度の圧力に設定する。FIG. 2 illustrates a generalized flow path, taking a downstream electromagnetic valve 12 as an example of an electromagnetic valve having a relief valve mechanism. An electromagnetic valve 12 provided between the flow path 9 and the flow path 10 has a movable core 15 having a valve body 14 directly connected to one end of an electromagnetic coil 13, and controls an exciting current flowing through the electromagnetic coil 13. Thus, the valve element 14 is moved up and down to connect or separate the flow path 9 and the flow path 10. A spring 1 for urging the movable core 15 to the closed side (downward in the figure) is provided on the opposite side of the movable core 15 to the valve element 14.
6 are attached. As shown in FIG. 3, when the internal pressure of the flow path 10 becomes higher than a predetermined pressure, the spring 16 contracts due to the internal pressure, so that the valve element 14 is lifted upward and the fluid in the flow path 10 Designed to flow into. That is, the solenoid valve 12 has a function of a relief valve (safety valve), and the space between the valve body 14 and the flow path 10 that is lifted upward is a bypass flow of the fluid in the flow paths 9 and 10. Form a road. Accordingly, the flow path 9 is connected to the main evaporator 4a side of the refrigerant flow path 8b and the flow path 10
Is the sub-evaporator 4b side, the sub-evaporator 4b
Side pressure rises and reaches a predetermined pressure at which the relief valve mechanism of the solenoid valve 12 operates, the valve element 1 of the solenoid valve 12
4 is lifted, and the refrigerant on the sub-evaporator 4b side flows into the main evaporator 4a side.
The pressure on the side is reduced, and the rupture of the sub-evaporator 4b can be prevented. The predetermined pressure at which the relief valve mechanism operates is about one-half of the withstand pressure of the sub-evaporator 4b.
Set the pressure to about 1/3.
【００１５】なお、本実施の形態においては、上流側の
電磁弁１１または下流側の電磁弁１２の一方または双方
にリリーフ弁機構を設けて副エバポレータ４ｂの破裂を
防止するようにしたが、図３に示すように、電磁弁１
１，１２の一方あるいは双方の内部にバイパス流路１７
を設け、このバイパス流路にリリーフ弁１８を設けて
も、同様の効果が得られる。また、冷媒を上流側の電磁
弁１１の上流側または下流側の電磁弁１２の下流側に開
放するバイパス流路を設けるとともに、このバイパス流
路にリリーフ弁を設けるようにしてもよい。図４は、そ
の一例で、１２は下流側の電磁弁、流路９は冷媒流路８
ｂの主エバポレータ４ａ側、流路１０は副エバポレータ
４ｂ側の流路で、上記流路９，１０間に上記電磁弁１２
をバイパスするバイパス流路１９を設けるとともに、こ
のバイパス流路１９内に、上記流路１０内の圧力上昇に
より、上記バイパス流路１９を開放するリリーフ弁２０
を設けることにより、副エバポレータ４ｂの破裂を防止
することができる。In this embodiment, one or both of the upstream solenoid valve 11 and the downstream solenoid valve 12 are provided with a relief valve mechanism to prevent the sub-evaporator 4b from bursting. As shown in FIG.
A bypass passage 17 is provided inside one or both of
The same effect can be obtained by providing a relief valve 18 in this bypass flow path. In addition, a bypass flow path that opens the refrigerant upstream of the electromagnetic valve 11 on the upstream side or downstream of the electromagnetic valve 12 on the downstream side may be provided, and a relief valve may be provided in the bypass flow path. FIG. 4 shows an example thereof, in which 12 is a solenoid valve on the downstream side, and the flow path 9 is a refrigerant flow path 8.
b is a flow path on the side of the main evaporator 4a, and a flow path 10 is a flow path on the side of the sub-evaporator 4b.
And a relief valve 20 for opening the bypass passage 19 in the bypass passage 19 due to a pressure increase in the passage 10.
, The rupture of the sub-evaporator 4b can be prevented.
【００１６】[0016]
【発明の効果】以上説明したように、請求項１に記載の
発明によれば、１つの冷凍サイクル内に並列に配置され
た複数の蒸発器の内、特定の蒸発器の上流側と下流側と
の双方に冷媒の流路を開閉する電磁弁を設けたので、上
記特定の蒸発器への凝縮された冷媒の浸入を防止するこ
とができるとともに、他の蒸発器からの気化された冷媒
の浸入を防止することができるので、上記特定の蒸発器
内の寝込みを確実に防止することができ、圧縮機の信頼
性を向上させることができる。As described above, according to the first aspect of the present invention, of a plurality of evaporators arranged in parallel in one refrigeration cycle, an upstream side and a downstream side of a specific evaporator. The electromagnetic valve for opening and closing the refrigerant flow path is provided on both of the above, so that the infiltration of the condensed refrigerant into the specific evaporator can be prevented, and the vaporized refrigerant from the other evaporators can be prevented from entering. Since intrusion can be prevented, stagnation in the specific evaporator can be reliably prevented, and reliability of the compressor can be improved.
【００１７】請求項２に記載の発明によれば、特定の蒸
発器に対する冷媒の供給を停止する場合には、上流側の
電磁弁を閉じた後に下流側の電磁弁を閉じるようにし、
特定の蒸発器に内に供給された冷媒を圧縮機に戻っすよ
うにしたので、上記蒸発器内に残留する冷媒の量が低減
され、冷媒の寝込みを防止を更に確実に行うことができ
る。According to the second aspect of the invention, when the supply of the refrigerant to the specific evaporator is stopped, the downstream electromagnetic valve is closed after the upstream electromagnetic valve is closed.
Since the refrigerant supplied to the specific evaporator is returned to the compressor, the amount of the refrigerant remaining in the evaporator is reduced, and the stagnation of the refrigerant can be more reliably prevented.
【００１８】請求項３記載の発明によれば、電磁弁の一
方あるいは双方を、リリーフ弁機構を備えた電磁弁から
構成したので、車室内の温度が上昇して蒸発器内の圧力
が上昇した場合には上記リリーフ弁機構が作動し、蒸発
器の破裂を防止することができる。According to the third aspect of the present invention, one or both of the solenoid valves is constituted by a solenoid valve having a relief valve mechanism, so that the temperature in the vehicle compartment rises and the pressure in the evaporator rises. In this case, the relief valve mechanism operates to prevent the evaporator from bursting.
【００１９】請求項４記載の発明によれば、上記電磁弁
の一方あるいは双方の内部にバイパス流路を設けるとと
もに、上記バイパス流路内にリリーフ弁を設けたので、
蒸発器内の圧力が上昇した場合でも、蒸発器の破裂を防
止することができる。According to the fourth aspect of the present invention, a bypass passage is provided inside one or both of the solenoid valves, and a relief valve is provided inside the bypass passage.
Even when the pressure in the evaporator rises, it is possible to prevent the evaporator from bursting.
【００２０】請求項５に記載の発明によれば、上流側の
電磁弁と下流側の電磁弁との間の冷媒流路に、冷媒を上
流側の電磁弁の上流側または下流側の電磁弁の下流側に
開放するバイパス流路を設けるとともに、このバイパス
流路にリリーフ弁を設けたので、蒸発器内の圧力上昇に
よる蒸発器の破裂を防止することができる。According to the fifth aspect of the present invention, the refrigerant is supplied to the refrigerant flow path between the upstream solenoid valve and the downstream solenoid valve in the upstream or downstream of the upstream solenoid valve. Since a bypass flow path is provided downstream of the evaporator and a relief valve is provided in the bypass flow path, the evaporator can be prevented from being ruptured due to a rise in pressure in the evaporator.
【図１】本発明の実施形態に係わる冷凍サイクルを示す
図である。FIG. 1 is a diagram showing a refrigeration cycle according to an embodiment of the present invention.
【図２】本発明の実施形態に係わるリリーフ機構を示す
図である。FIG. 2 is a view showing a relief mechanism according to the embodiment of the present invention.
【図３】リリーフ機構の他の例を示す図である。FIG. 3 is a view showing another example of a relief mechanism.
【図４】リリーフ機構の他の例を示す図である。FIG. 4 is a diagram showing another example of the relief mechanism.
【図５】従来の冷凍サイクルを示す図である。FIG. 5 is a view showing a conventional refrigeration cycle.
【図６】従来の冷凍サイクルの他の例を示す図である。FIG. 6 is a view showing another example of a conventional refrigeration cycle.
１ コンプレサ、２ コンデンサ、３ａ，３ｂ 膨張
弁、４ａ 主エバポレータ、４ｂ 副エバポレータ、５
受液器、７ 分岐点、８ 合流点、１１ 第１の電磁
弁、１２ 第２の電磁弁Reference Signs List 1 compressor, 2 condenser, 3a, 3b expansion valve, 4a main evaporator, 4b sub-evaporator, 5
Liquid receiver, 7 branch point, 8 junction point, 11 first solenoid valve, 12 second solenoid valve
Claims (5)
冷凍サイクルにおいて、上記蒸発器の内、特定の蒸発器
の上流側と下流側との双方に冷媒の流路を開閉する電磁
弁を設けたことを特徴とする冷凍サイクル。In a refrigeration cycle having a plurality of evaporators arranged in parallel, an electromagnetic valve for opening and closing a refrigerant flow path both upstream and downstream of a specific evaporator among said evaporators. A refrigeration cycle comprising:
停止する場合には、上流側の電磁弁を閉じた後に下流側
の電磁弁を閉じるようにしたことを特徴とする請求項１
記載の冷凍サイクル。2. The method according to claim 1, wherein when the supply of the refrigerant to the specific evaporator is stopped, the downstream electromagnetic valve is closed after the upstream electromagnetic valve is closed.
Refrigeration cycle as described.
ーフ弁機構を備えた電磁弁から構成したことを特徴とす
る請求項１又は請求項２記載の冷凍サイクル。3. The refrigeration cycle according to claim 1, wherein one or both of the solenoid valves is constituted by a solenoid valve having a relief valve mechanism.
バイパス流路を設けるとともに、このバイパス流路内に
リリーフ弁を設けたことを特徴とする請求項１又は請求
項２記載の冷凍サイクル。4. The refrigeration cycle according to claim 1, wherein a bypass passage is provided inside one or both of the solenoid valves, and a relief valve is provided in the bypass passage.
を上流側の電磁弁の上流側または下流側の電磁弁の下流
側に開放するためのバイパス流路を設けるとともに、こ
のバイパス流路にリリーフ弁を設けたことを特徴とする
請求項１又は請求項２記載の冷凍サイクル。5. A refrigerant flow path between the two solenoid valves is provided with a bypass flow path for releasing the refrigerant upstream of the upstream electromagnetic valve or downstream of the downstream electromagnetic valve. The refrigeration cycle according to claim 1 or 2, wherein a relief valve is provided in the flow path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10294920A JP2000118231A (en) | 1998-10-16 | 1998-10-16 | Refrigerating cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10294920A JP2000118231A (en) | 1998-10-16 | 1998-10-16 | Refrigerating cycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000118231A true JP2000118231A (en) | 2000-04-25 |
Family
ID=17813976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10294920A Pending JP2000118231A (en) | 1998-10-16 | 1998-10-16 | Refrigerating cycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000118231A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006214703A (en) * | 2005-02-07 | 2006-08-17 | Fuji Electric Retail Systems Co Ltd | Refrigerant circuit and beverage supply device |
| US7866378B2 (en) | 2004-11-09 | 2011-01-11 | Denso Corporation | Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same |
| US8966936B2 (en) | 2010-08-12 | 2015-03-03 | Halla Visteon Climate Control Corporation | Expansion valve and air conditioner for vehicles having the same |
| US8978412B2 (en) | 2009-12-04 | 2015-03-17 | Halla Visteon Climate Control Corporation | Air conditioner for vehicles |
| WO2018193518A1 (en) * | 2017-04-18 | 2018-10-25 | 三菱電機株式会社 | Air conditioner |
| US11435124B2 (en) | 2018-02-28 | 2022-09-06 | Carrier Corporation | Refrigeration system with leak detection |
-
1998
- 1998-10-16 JP JP10294920A patent/JP2000118231A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7866378B2 (en) | 2004-11-09 | 2011-01-11 | Denso Corporation | Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same |
| US9669499B2 (en) | 2004-11-09 | 2017-06-06 | Denso Corporation | Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same |
| JP2006214703A (en) * | 2005-02-07 | 2006-08-17 | Fuji Electric Retail Systems Co Ltd | Refrigerant circuit and beverage supply device |
| US8978412B2 (en) | 2009-12-04 | 2015-03-17 | Halla Visteon Climate Control Corporation | Air conditioner for vehicles |
| US8966936B2 (en) | 2010-08-12 | 2015-03-03 | Halla Visteon Climate Control Corporation | Expansion valve and air conditioner for vehicles having the same |
| WO2018193518A1 (en) * | 2017-04-18 | 2018-10-25 | 三菱電機株式会社 | Air conditioner |
| JPWO2018193518A1 (en) * | 2017-04-18 | 2019-11-21 | 三菱電機株式会社 | Air conditioner |
| CN110494701A (en) * | 2017-04-18 | 2019-11-22 | 三菱电机株式会社 | Air conditioner |
| RU2743727C1 (en) * | 2017-04-18 | 2021-02-25 | Мицубиси Электрик Корпорейшн | Air conditioning unit |
| US11204191B2 (en) | 2017-04-18 | 2021-12-21 | Mitsubishi Electric Corporation | Air-conditioning apparatus provided with refrigerant circuit capable of performing heating operation |
| US11435124B2 (en) | 2018-02-28 | 2022-09-06 | Carrier Corporation | Refrigeration system with leak detection |
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