JPH0363471A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH0363471A JPH0363471A JP1198488A JP19848889A JPH0363471A JP H0363471 A JPH0363471 A JP H0363471A JP 1198488 A JP1198488 A JP 1198488A JP 19848889 A JP19848889 A JP 19848889A JP H0363471 A JPH0363471 A JP H0363471A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- sensor
- heat exchanger
- indoor
- outdoor heat
- 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
- 239000003507 refrigerant Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 abstract description 22
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000013021 overheating Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は室外ユニットに複数台の室内ユニットを接続し
た多室型の空気調和装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a multi-room air conditioner in which a plurality of indoor units are connected to an outdoor unit.
（ロ）従来の技術
圧縮機と２個の室外熱交換器とを有する室外ユニットに
室内熱交換器を有する複数台の室内ユニットを接続して
、複数室の全てを同時に冷房又は暖房でき、且つ複数室
を同時に冷暖房できる多室型の空気調和装置が実公昭５
４−３０２０号公報で提示されている。(b) Conventional technology A plurality of indoor units each having an indoor heat exchanger are connected to an outdoor unit having a compressor and two outdoor heat exchangers, and all of the plurality of rooms can be simultaneously cooled or heated; A multi-room air conditioner that can cool and heat multiple rooms at the same time was developed in 1974.
It is presented in Publication No. 4-3020.
かかる空気調和装置では２個の室外熱交換器の一方のみ
に開閉弁を設け、全ての室内ユニットを同時冷房、又は
同時暖房する時に開閉弁を開いて２個の室外熱交換器を
凝縮器又は蒸発器として作用させ、冷暖房を同時に行な
う時は開閉弁を閉じて１個の室外熱交換器を凝縮器ある
いは蒸発器として作用させている。In such an air conditioner, only one of the two outdoor heat exchangers is provided with an on-off valve, and when all indoor units are simultaneously cooled or heated, the on-off valve is opened and the two outdoor heat exchangers are used as a condenser or a condenser. When operating as an evaporator and performing heating and cooling simultaneously, the on-off valve is closed and one outdoor heat exchanger is operated as a condenser or an evaporator.
（ハ〉発明が解決しようとする課題
上記公報で提示の装置では、室外熱交換器と接続された
１個の毛細管で冷媒を減圧させて室外熱交換器を蒸発器
として作用させているため、開閉弁を開閉させて室外熱
交換器の容量が変わっても毛細管による冷媒減圧量は変
わらず、室外熱交換器で冷媒過熱度がとれ過ぎたり、逆
に充分蒸発しきれずに液状態で冷媒が圧縮機に戻る虞れ
があった。(C) Problems to be Solved by the Invention In the device presented in the above publication, the pressure of the refrigerant is reduced through a single capillary tube connected to the outdoor heat exchanger, so that the outdoor heat exchanger acts as an evaporator. Even if the capacity of the outdoor heat exchanger is changed by opening and closing the on-off valve, the amount of refrigerant decompression by the capillary remains the same, and the degree of superheat of the refrigerant in the outdoor heat exchanger may be removed too much, or conversely, the refrigerant may not be evaporated sufficiently and the refrigerant may remain in a liquid state. There was a risk that it would return to the compressor.
このため、各室外熱交換器の冷媒入口側と冷媒出口側と
に夫々センサを設けると共に各室外熱交換器に入口側セ
ンサと出口側センサとの冷媒温度差で弁開度が変わる電
気式膨張弁を用いることを試みたが、各室外熱交換器に
２個づつのセンサを必要とするため、センサの数が増え
る不具合さを有していた。For this reason, sensors are installed on the refrigerant inlet side and refrigerant outlet side of each outdoor heat exchanger, and an electric expansion type in which the valve opening degree changes depending on the refrigerant temperature difference between the inlet side sensor and the outlet side sensor for each outdoor heat exchanger. An attempt was made to use valves, but this required two sensors for each outdoor heat exchanger, resulting in an increase in the number of sensors.
本発明はかかる課題を解決すると共に各電気式膨張弁で
冷媒を適正に減圧するようにした空気調和装置を提供す
ることを目的としたものである。SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and provide an air conditioner in which each electric expansion valve appropriately reduces the pressure of the refrigerant.
〈二〉課題を解決するための手段
本発明は圧縮機の冷媒吸込管を分岐させてこの吸込分岐
管を複数個の室外熱交換器の夫々の一端に切換弁を介し
て接続すると共に複数個の室外熱交換器の夫々の他端に
電気式膨張弁を接続する一方、圧縮機の吐出冷媒の一部
を前記冷媒吸込管へ導くバイパス管に補助熱交換器を設
けると共に、このバイパス管には補助熱交換器の出口側
に第１センサを、前記吸込分岐管には切換弁の出口側に
第２センサを夫々設け、第１センサと第２センサとの検
出温度差に基づいて各電気式膨張弁の弁開度を制御する
制御手段を備えるようにしたものである。<2> Means for Solving the Problems The present invention branches a refrigerant suction pipe of a compressor and connects this suction branch pipe to one end of each of a plurality of outdoor heat exchangers via a switching valve. An electric expansion valve is connected to the other end of each of the outdoor heat exchangers, and an auxiliary heat exchanger is provided in the bypass pipe that leads a part of the refrigerant discharged from the compressor to the refrigerant suction pipe, and an auxiliary heat exchanger is provided in the bypass pipe. A first sensor is provided on the outlet side of the auxiliary heat exchanger, and a second sensor is provided on the outlet side of the switching valve in the suction branch pipe. The present invention is equipped with a control means for controlling the valve opening degree of the type expansion valve.
（ホ〉作用
各室内ユニットの同時暖房運転又は冷暖房同時運転時、
蒸発器として作用している各室外熱交換器には液冷媒が
夫々の電気式膨張弁で減圧された後に導かれて蒸発気化
しているが、夫々の電気式膨張弁の弁開度は夫々の室外
熱交換器の切換弁を出た後の冷媒温度を検出する第２セ
ンサと飽和温度を検出する第１センサとの検出温度差に
基づいて調節される。(E) Effect When each indoor unit is in simultaneous heating or cooling operation,
The liquid refrigerant is depressurized by each electric expansion valve and then guided to each outdoor heat exchanger that acts as an evaporator, where it evaporates and vaporizes.The valve opening degree of each electric expansion valve is different. The temperature is adjusted based on the detected temperature difference between the second sensor that detects the refrigerant temperature after exiting the switching valve of the outdoor heat exchanger and the first sensor that detects the saturation temperature.
（へ）実施例
本発明の実施例を図面に基づいて説明すると、第１＠に
おいて、〈１）は能力可変型圧縮ｍ（２ａ）と定能力型
圧縮機（２ｂ）と熱交換容量が異なる室外熱交換器（３
ａ）（３ｂ）（３ｃ）と気液分離器（４）とを有する室
外ユニット、（５ａ）（５ｂ）（５ｃ）は室内熱交換器
（６ａ〉（６ｂ）（６ｃ）を有する室内ユニットで、圧
縮機（２ａ）（２ｂ〉の冷媒吐出管〈７）と冷媒吸込管
（８〉とを分岐させてこの分岐管を室外熱交換器（３ａ
）（３ｂ）（３ｃ）の夫々の一端に室外側切換弁（９ａ
）（９ｂ）（９ｃ） 、 （１０ａ）（１０ｂ）（１０
ｃ）を介して接続する一方、室外ユニット（１）と室内
ユニット（５ａ）（５ｂ）（５ｃ）とを接続するユニッ
ト間配管（１１）を冷媒吐出管〈７〉と分岐接続された
高圧ガス管（１２）と、冷媒吸込管（８〉と分岐接続さ
れた低圧ガス管（１３〉と、室外熱交換器（３ａ）（３
ｂ）（３ｃ）の他端と結氷防止コイル（１４ａ）（１４
ｂ）及び室外側電気式膨張弁（１５ａ）（１５ｂ）（１
５ｃ）を介して接続された液管〈１６〉とで構成して、
各室内熱交換器（６ｇ）（６ｂ）（６ｃ〉の一端を高圧
ガス管〈１２〉と低圧ガス管〈１３）とに夫々室内側切
換弁（１７ａ）（１８ａ） 、 （ｉ７ｂ）（１８ｂ）
、 ＜１７０）（１８ｃ）を介して分岐接続すると共
に液管（１６）には室内側電気式膨張弁（１９ａ）（１
９ｂ）（１９ｃ）を介して接続している。(F) Example To explain the example of the present invention based on the drawings, in the first @, <1) has different heat exchange capacity between the variable capacity compressor m (2a) and the constant capacity compressor (2b). Outdoor heat exchanger (3
a) (3b) (3c) and an outdoor unit having a gas-liquid separator (4); (5a) (5b) (5c) an indoor unit having an indoor heat exchanger (6a>(6b) (6c); , the refrigerant discharge pipes (7) and the refrigerant suction pipes (8) of the compressors (2a) (2b) are branched, and this branch pipe is connected to the outdoor heat exchanger (3a).
) (3b) (3c) At one end of each of the outdoor switching valves (9a
) (9b) (9c) , (10a) (10b) (10
c), while the inter-unit piping (11) connecting the outdoor unit (1) and the indoor units (5a) (5b) (5c) is branch-connected to the refrigerant discharge pipe <7>. pipe (12), a low-pressure gas pipe (13) branch-connected to the refrigerant suction pipe (8), and an outdoor heat exchanger (3a) (3).
b) The other end of (3c) and the anti-icing coil (14a) (14
b) and outdoor electric expansion valves (15a) (15b) (1
5c) and a liquid pipe <16> connected via
One end of each indoor heat exchanger (6g) (6b) (6c) is connected to the high pressure gas pipe (12) and the low pressure gas pipe (13) using indoor switching valves (17a) (18a), (i7b) (18b), respectively.
, <170) (18c), and the indoor electric expansion valve (19a) (16) is connected to the liquid pipe (16).
9b) (19c).
（２０〉は冷媒吐出管（７）と冷媒吸込管〈８〉とに跨
がって設けられたバイパス管で、冷媒吸込管（８）と熱
交換する補助熱交換器（２１）と毛細管（２２）とを設
けると共に、このバイパス管（２０）には補助熱交換器
（２１）の出口側に第１センサ（２３）を、吸込分岐管
（８ａ）（８ｂ）（８ｃ）には室外側切換弁（１０ａ）
（１０ｂ）（１０Ｃ〉の出口側に第２センサ（２４ａ）
（２４ｂ）（２４ｃ）を夫々設けている。 （２５）は
第１センサ（２３〉と第２センサ（２４ａ）（２４ｂ）
（２４ｃ）との検出温度差に基づいて各電気式膨張弁（
１５ａ）（１５ｂ）（１５ｃ）の弁開度を制御する制御
手段である。(20> is a bypass pipe provided astride the refrigerant discharge pipe (7) and the refrigerant suction pipe <8>, and the auxiliary heat exchanger (21) and the capillary pipe (20) that exchange heat with the refrigerant suction pipe (8) 22), and the bypass pipe (20) is provided with a first sensor (23) on the outlet side of the auxiliary heat exchanger (21), and the suction branch pipes (8a) (8b) (8c) are provided with a first sensor (23) on the outlet side of the auxiliary heat exchanger (21). Switching valve (10a)
(10b) Second sensor (24a) on the exit side of (10C)
(24b) and (24c) are provided, respectively. (25) is the first sensor (23) and the second sensor (24a) (24b)
(24c) Each electric expansion valve (
15a), (15b), and (15c).
第２図は室外ユニット（１）の断面図であり、大容量の
室外熱交換器（３ａ）と結氷防止コイル（１４ａ）を−
側に、中容量の室外熱交換器（３ｂ）と小容量の室外熱
交換器〈３Ｃ〉と結氷防止コイル（１４ｂ）を他側に設
けて、両側面の吸込口（２６〉から上面の吹出口（２７
）へ室外ファン（２８〉で送出される室外空気と各室外
熱交換器（３ａ）（３ｂ）（３ｃ）が熱交換されるよう
になっており、これら室外熱交換器（３ａ）（３ｂ）（
３ｃ）が蒸発器として作用している時は冷媒が電気式膨
張弁（１５ａ）（１５ｂ＞で−段膨張した後に結氷防止
コイル（１４ａ）（１４ｂ）を通って分流管（２９ａ）
（２９ｂ）で二段膨張する際、結氷防止コイル（１４ａ
）（１４ｂ）から放出される熱で室外熱交換器（３ａ）
（３ｂ）の下部を温めて凍結するのを防止している。Figure 2 is a sectional view of the outdoor unit (1), showing the large capacity outdoor heat exchanger (3a) and anti-icing coil (14a).
A medium-capacity outdoor heat exchanger (3b), a small-capacity outdoor heat exchanger (3C), and an anti-icing coil (14b) are installed on the other side. Exit (27
) The outdoor air sent out by the outdoor fan (28>) and each outdoor heat exchanger (3a) (3b) (3c) are designed to exchange heat, and these outdoor heat exchangers (3a) (3b) (
When 3c) is functioning as an evaporator, the refrigerant is expanded in stages through the electric expansion valves (15a) (15b) and then passed through the anti-icing coils (14a) and (14b) to the branch pipe (29a).
(29b) when expanding in two stages, the anti-icing coil (14a)
) (14b) to the outdoor heat exchanger (3a).
The lower part of (3b) is heated to prevent it from freezing.
次に運転動作を説明する。全室を同時に冷房する場合は
、室外熱交換器（３ａ）（３ｂ）（３ｃ）の夫々の一方
の室外側切換弁（９ａ）（９ｂ）（９ｃ）を開くと共に
他方の室外側切換弁（１０ａ）（１０ｂ）（１０ｃ）を
閉じ、且つ室内熱交換器（６ａ）（６ｂ）（６ｃ）の一
方の室内側切換弁（１７ａ）（１７ｂ）（１７ｃ）を閉
じると共に他方の室内側切換弁（１８ａ）（１８ｂ）（
１８ｃ）を開くことにより、圧縮機（２ａ）（２ｂ）か
ら吐出された冷媒は吐出管（７）より、切換弁（９ａ）
（９ｂ）（９ｃ）、室外熱交換器（３ａ）（３ｂ）（３
ｃ）、結氷防止コイル（１４ａ）（１４ｂ）と並流して
ここで凝縮液化した後、全開状態の電気式膨張弁（１５
ａ）（１５ｂ）（１５ｃ）、液管（１６）を経て各室内
ユニット（５ａ）（５ｂ）（５ｃ）の電気式膨張弁（１
９ａ）（１９ｂ）（１９ｃ）に分配され、ここで減圧さ
れる。然る後、各室内熱交換器（６ａ）（６ｂ）（６ｃ
）で蒸発気化した後、夫々室内側切換弁（１８ａ）（１
８ｂ）（１８ｃ）、低圧ガス管（１３）、吸込管（８）
、気液分離器（４）を順次繰て圧縮機（２ａ）（２ｂ）
に吸入される。このように蒸発器として作用する各室内
熱交換器（６ａ）（６ｂ）（６ｃ）で全室が同時に冷房
される。Next, the driving operation will be explained. When cooling all rooms at the same time, open one outdoor switching valve (9a), (9b), and (9c) of each of the outdoor heat exchangers (3a), (3b, and 3c), and open the other outdoor switching valve ( 10a), (10b), and (10c), and close one of the indoor switching valves (17a), (17b, and 17c) of the indoor heat exchangers (6a), (6b, and 6c), and close the other indoor switching valve. (18a) (18b) (
18c), the refrigerant discharged from the compressors (2a) and (2b) is transferred from the discharge pipe (7) to the switching valve (9a).
(9b) (9c), outdoor heat exchanger (3a) (3b) (3
c), in parallel with the anti-icing coils (14a) and (14b), where the electric expansion valve (15
a) (15b) (15c) and the electric expansion valve (1) of each indoor unit (5a) (5b) (5c) via the liquid pipe (16).
9a), (19b), and (19c), where the pressure is reduced. After that, each indoor heat exchanger (6a) (6b) (6c
), the indoor switching valves (18a) and (1
8b) (18c), low pressure gas pipe (13), suction pipe (8)
, compressor (2a) (2b) by sequentially repeating the gas-liquid separator (4)
is inhaled. In this way, all rooms are simultaneously cooled by each indoor heat exchanger (6a) (6b) (6c) acting as an evaporator.
逆に全室を同時に暖房する場合は、室外熱交換器（３ａ
）（３ｂ）（３ｃ）の一方の室外側切換弁（９ａ）（９
ｂ）（９Ｃ〉を閉じると共に他方の室外側切換弁（１０
ａ）（１０ｂ）（１０ｃ）を開き、且つ室内熱交換器（
６ａ）（６ｂ）（６ｃ））の一方の室内側切換弁（１７
ａ）（１７ｂ）（１７ｃ）を開くと共に他方の室内側切
換弁（１８ａ）（１８ｂ）（１８ｃ）を閉じることによ
り、圧縮機（２ａ）＜２ｂ）から吐出された冷媒は吐出
管（７）、高圧ガス管（１２〉を順次繰て切換弁（１７
ａ）（１７ｂ＞（１７ｃ）、室内熱交換器（６ａ）（６
ｂ）（６ｃ）へと分配され、ここで夫々凝縮液化した後
、全開状態の各電気式膨張弁（１９ａ）（１９ｂ）（１
９ｃ）を経て液管（１６）で合流され、然る後、電気式
膨張弁（１５ａ）（１５ｂ）（１５ｃ）で減圧されて室
外熱交換器（３ａ）（３ｂ）（３ｃ）で蒸発気化した後
、切換弁（１０ａ）（１０ｂ）（ｉｏｃ）、吸込管（８
）、気液分離器（４）を順次繰て圧縮機（２ａ）（２ｂ
）に吸入される。このように凝縮器として作用する各室
内熱交換器（６ａ）（６ｂ）（６ｃ）で全室が同時に暖
房される。Conversely, if you want to heat all rooms at the same time, use an outdoor heat exchanger (3a
) (3b) (3c), one of the outdoor switching valves (9a) (9
b) Close (9C) and close the other outdoor switching valve (10
a) Open (10b) and (10c), and open the indoor heat exchanger (
6a) (6b) (6c)) one of the indoor side switching valves (17
a) By opening (17b) (17c) and closing the other indoor switching valve (18a) (18b) (18c), the refrigerant discharged from the compressor (2a)<2b) is transferred to the discharge pipe (7). , high-pressure gas pipe (12) in sequence and switch valve (17)
a) (17b>(17c), indoor heat exchanger (6a) (6
b) (6c), and after being condensed and liquefied there, the electric expansion valves (19a), (19b), and (1) are fully opened.
9c) and are combined in the liquid pipe (16), then the pressure is reduced by the electric expansion valves (15a) (15b) (15c), and the mixture is evaporated in the outdoor heat exchanger (3a) (3b) (3c). After that, the switching valves (10a) (10b) (ioc), suction pipe (8
), the gas-liquid separator (4) is sequentially repeated to create the compressor (2a) (2b
) is inhaled. In this way, all rooms are heated simultaneously by each indoor heat exchanger (6a) (6b) (6c) acting as a condenser.
かかる全室同時暖房運転時、圧縮機（２ａ）（２ｂ）か
らの吐出冷媒の一部がバイパス管（２０）を経て補助熱
交換器（２１）に流入し、ここで吸込管（８）を流れる
低温冷媒で冷やされて凝縮した後に毛細管〈２２〉で減
圧されて吸込管（８）に流れており、毛細管（２２〉を
出た低圧液冷媒の飽和温度（丁Ｓ〉を第１センサ（２３
）で、吸込分岐管（８ａ）（８ｂ）（８ｃ）を流れる低
圧冷媒温度（Ｔａ）（より）（Ｔｃ）を第２センサ（２
４ａ）（２４ｂ）（２４Ｃ）で夫々検出してこの検出温
度差に基づく制御手段〈２５）からの信号で各電気式膨
張弁（１５ａ）（１５ｂ）（１５ｃ）は弁開度が制御さ
れており、例えば、第２センサ（２４ａ）で検出した温
度（Ｔａ）から第１センサ（２３）で検出した飽和温度
（Ｔｓ）を差し引いた温度差（ｔａ）が５℃を上回わり
冷媒過熱度が大きくなると電気式膨張弁（ｉ５ａ）の弁
開度が大きくなり、逆に上述の温度差（ｔａ）が２°Ｃ
を下回わり冷媒が液戻りするようになると電気式膨張弁
（１５ａ）の弁開度が小さくなり、冷媒が適正に減圧調
整されている。同時に、電気式膨張弁（１５ｂ＞は第２
センサ（２４ｂ＞と第１センサ〈２３）との検出温度差
で、電気式膨張弁（１５ｃ）は第２センサ（２４ｃ）と
第１センサ（２３）との検出温度差で、夫々上述の電気
式膨張弁（１５ａ）と同様に弁開度が制御され、これに
より各室外熱交換器（３ａ）（３ｂ）（３ｃ）への冷媒
分流調整も適正に行なわれている。During such simultaneous heating operation for all rooms, a portion of the refrigerant discharged from the compressors (2a) (2b) flows into the auxiliary heat exchanger (21) via the bypass pipe (20), where it is passed through the suction pipe (8). After being cooled and condensed by the flowing low-temperature refrigerant, the pressure is reduced in the capillary tube <22> and flows into the suction pipe (8). 23
), the temperature (Ta) (Tc) of the low-pressure refrigerant flowing through the suction branch pipes (8a) (8b) (8c) is measured by the second sensor (2
The valve opening degree of each electric expansion valve (15a) (15b) (15c) is controlled by a signal from the control means (25) based on the detected temperature difference detected by 4a), (24b), and (24C), respectively. For example, if the temperature difference (ta) obtained by subtracting the saturation temperature (Ts) detected by the first sensor (23) from the temperature (Ta) detected by the second sensor (24a) exceeds 5°C, the refrigerant superheat degree When becomes larger, the valve opening degree of the electric expansion valve (i5a) becomes larger, and conversely, when the above-mentioned temperature difference (ta) increases by 2°C
When the refrigerant returns to a liquid state, the opening degree of the electric expansion valve (15a) becomes smaller, and the refrigerant is properly reduced in pressure. At the same time, the electric expansion valve (15b>
Due to the detected temperature difference between the sensor (24b> and the first sensor <23), the electric expansion valve (15c) is activated by the detected temperature difference between the second sensor (24c) and the first sensor (23), respectively. The valve opening degree is controlled in the same way as the type expansion valve (15a), and thereby the refrigerant distribution to each outdoor heat exchanger (3a) (3b) (3c) is also appropriately adjusted.
これらの弁開度制御において、第２センサ（２４ａ）（
２４ｂ）（２４ｃ）を切換弁（１０ａ）（１０ｂ）（１
０ｃ）の冷媒入口側に設けると、切換弁（１０ａ）（１
０ｂ） （１０ｃ）の冷媒圧力損失により第２センサ（
２４ａ）（２４ｂ）（２４ｃ）で冷媒温度を正確に検出
できず、冷媒が液戻りしていても冷媒過熱度がとれてい
るといった具合に誤まった検出信号が制御手段（２５）
に入力される為、第２センサ（２４ａ）（２４ｂ）（２
４ｃ）を切換弁（１０ａ）（１０ｂ）（１０ｃ）の冷媒
出口側に設けるようにしたものである。In these valve opening control, the second sensor (24a) (
24b) (24c) to the switching valve (10a) (10b) (1
When installed on the refrigerant inlet side of the switching valve (10a) (1
0b) Due to the refrigerant pressure loss in (10c), the second sensor (
24a), (24b), and (24c) cannot accurately detect the refrigerant temperature, and the control means (25) receives an erroneous detection signal, such as when the refrigerant is not superheated even though the refrigerant has returned to its liquid state.
2nd sensor (24a) (24b) (2
4c) is provided on the refrigerant outlet side of the switching valves (10a), (10b), and (10c).
又、かかる全室同時暖房運転時、例えば室内ユニット（
５ｂ）がサーモオフして暖房運転が停止し暖房負荷が小
さくなると、制御手段（２５）からの信号で室外熱交換
器（３ｂ）の切換弁（９ｂ）（１０ｂ）と電気式膨張弁
（１５ｂ）が閉じてこの室外熱交換器（３ｂ〉が蒸発器
としての作用を停止し、上述のように弁開度制御される
電気式膨張弁（１５ａ）（１５ｃ）で冷媒が減圧されて
室外熱交換器（３ａ）（３ｃ）が蒸発器として作用され
、暖房負荷に見合った蒸発器能力で運転される。Also, during such simultaneous heating operation in all rooms, for example, the indoor unit (
5b) turns off the thermostat to stop heating operation and reduce the heating load, a signal from the control means (25) turns on the switching valves (9b) (10b) and the electric expansion valve (15b) of the outdoor heat exchanger (3b). is closed and this outdoor heat exchanger (3b) stops functioning as an evaporator, and the refrigerant is depressurized by the electric expansion valves (15a) and (15c) whose valve openings are controlled as described above, and outdoor heat exchange begins. The evaporators (3a) and (3c) act as evaporators and are operated at an evaporator capacity commensurate with the heating load.
又、同時に任意の例えば二基を冷房し一室を暖房する場
合は、室外熱交換器〈３ａ〉の一方の室外側切換弁（９
ａ）を開くと共に他方の室外側切換弁（１０ａ）と室外
熱交換器（３ａ）（３ｂ）の両方の切換弁（９ｂ）（１
０ｂ） 、 （９ｃ）（１０ｃ）を閉じ、且つ、冷房す
る室内ユニット（５ｂ）（５ｃ）の−力の室内側切換弁
（１７ｂ）（１７ｃ）を閉じると共に他方の室内側切換
弁’（１８ｂ）（１８ｃ）を開き、且つ暖房する室内ユ
ニット（５ａ）の一方の室内側切換弁（１７ａ）を開く
と共に他方の室内側切換弁（１８ａ）を閉じると、圧縮
機（２ａ）（２ｂ）から吐出された冷媒の一部が吐出管
（７）、切換弁（９ａ）を順次経て一方の室外熱交換器
（３ａ〉のみに流れると共に残りの冷媒が高圧ガス管（
１２）を経て暖房する室内ユニット（５ａ）の切換弁（
１７ａ）、室内熱交換器（６ａ）へと流れ、この室内熱
交換器（６ａ）と室外熱交換器〈３ａ〉とで凝縮液化さ
れる。そして、これら熱交換器（６ａ）（３ａ）で凝縮
液化された冷媒は全開状態の電気式膨張弁（１５ａ）（
１９ａ）、液管〈１６）を経て室内ユニット（５ｂ）＜
５ｃ）の電気式膨張弁（１９ｂ）（１９ｃ）で減圧され
た後、夫々の室内熱交換器（６ｂ）（６ｃ）で蒸発気化
され、然る後、各室内側切換弁（１８ｂ）（１８ｃ）を
経て低圧ガス管（１３）で合流され、吸込管（８〉、気
液分離器（４）を順次経て圧縮機＜２）に吸入される。In addition, if you want to simultaneously cool two units and heat one room at the same time, use one of the outdoor switching valves (9) of the outdoor heat exchanger (3a).
a) and open the other outdoor switching valve (10a) and both switching valves (9b) (1) of the outdoor heat exchanger (3a) (3b).
0b), (9c) and (10c), and close the indoor switching valves (17b) and (17c) of the indoor units (5b) and (5c) for cooling, and close the other indoor switching valve'(18b). ) (18c), open one indoor switching valve (17a) of the heating indoor unit (5a), and close the other indoor switching valve (18a), the compressors (2a) and (2b) A part of the discharged refrigerant passes through the discharge pipe (7) and the switching valve (9a) in order and flows only to one outdoor heat exchanger (3a), and the remaining refrigerant flows through the high pressure gas pipe (
12) of the indoor unit (5a) that heats via the switching valve (
17a), flows to the indoor heat exchanger (6a), and is condensed and liquefied in the indoor heat exchanger (6a) and the outdoor heat exchanger <3a>. Then, the refrigerant condensed and liquefied in these heat exchangers (6a) (3a) is transferred to the electric expansion valve (15a) (
19a), the indoor unit (5b) via the liquid pipe <16)
After the pressure is reduced by the electric expansion valves (19b) (19c) of 5c), it is evaporated and vaporized by the respective indoor heat exchangers (6b) (6c), and then the indoor switching valves (18b) (18c) ), the gases are combined in a low-pressure gas pipe (13), and then sequentially passed through a suction pipe (8) and a gas-liquid separator (4) before being sucked into a compressor (2).
このように凝縮器として作用する室内熱交換器（６ａ）
で−室が暖房され、蒸発器として作用する他の室内熱交
換器（６ｂ）（６ｃ）で二基が冷房される。Indoor heat exchanger (6a) that acts as a condenser in this way
The room is heated and the two rooms are cooled by another indoor heat exchanger (6b) (6c) acting as an evaporator.
又、同時に任意の例えば室内ユニット（５ａ〉で−室を
冷房し、室内ユニット（５ｂ）（５ｃ）で二基を暖房す
る場合は、室外熱交換器（３ａ）の一方の室外側切換弁
（１０ａ）を開くと共に他方の室外側切換弁（９ａ）（
９ｂ）（９ｃ）（１０ｂ）（１０ｃ）を閉じ、且つ冷房
する室内ユニット（５ａ）の一方の室内側切換弁（１７
ａ）を閉じると共に他方の室内側切換弁（１８ａ）を開
き、且つ暖房する室内ユニット（５ｂ）（５ｃ）の一方
の室内側切換弁（１７ｂ）（１７ｃ）を開くと共に他方
の室内側切換弁（１８ｂ）（１８ｃ）を閉じると、圧縮
機（２ｇ）（２ｂ）から吐出された冷媒が吐出管（７）
、高圧ガス管（１２）を順次経て室内側切換弁（１７ｂ
）（１７ｃ）へと分配され夫々の室内熱交換器（６ｂ）
（６ｃ）で凝縮液化される。そしてこの液化された冷媒
は夫々全開状態の電気式膨張弁（１９ｂ）（１９ｃ）を
経て液管（１６〉に流れ、この液管中の液冷媒の一部が
電気式膨張弁（１９ａ）で減圧された後に室内熱交換器
（６ａ）で、且つ残りの液冷媒が電気式膨張弁（１５ａ
）で減圧された後に室外熱交換器〈３ａ〉で夫々蒸発気
化され、吸込管（８）、気液分離器（４〉を順次経て圧
縮機（２ａ）（２ｂ）に吸入される。In addition, when simultaneously cooling one room with an indoor unit (5a) and heating two indoor units (5b) and (5c), one of the outdoor switching valves (3a) of the outdoor heat exchanger (3a) 10a) and open the other outdoor switching valve (9a) (
9b) (9c) (10b) (10c) and one indoor side switching valve (17) of the indoor unit (5a) that cools the air conditioner.
a) while opening the other indoor switching valve (18a), and opening one of the indoor switching valves (17b) (17c) of the indoor unit (5b) (5c) for heating while opening the other indoor switching valve. When (18b) and (18c) are closed, the refrigerant discharged from the compressors (2g) and (2b) flows into the discharge pipe (7).
, the high pressure gas pipe (12) and then the indoor switching valve (17b).
) (17c) and their respective indoor heat exchangers (6b)
It is condensed and liquefied in (6c). This liquefied refrigerant then flows into the liquid pipe (16>) through the electric expansion valves (19b) and (19c), which are fully open, respectively, and a part of the liquid refrigerant in this liquid pipe passes through the electric expansion valve (19a). After the pressure is reduced, the remaining liquid refrigerant is transferred to the indoor heat exchanger (6a) and the electric expansion valve (15a).
), and then evaporated and vaporized in the outdoor heat exchanger <3a>, and sequentially passed through the suction pipe (8) and the gas-liquid separator (4>), and then sucked into the compressors (2a) and (2b).
このように凝縮器として作用する室内熱交換器（６ｂ）
（６ｃ）で二基が暖房され、蒸発器として作用する他の
室内熱交換器〈６ａ〉で−室が冷房される。Indoor heat exchanger (6b) that acts as a condenser in this way
(6c) heats the two rooms, and another indoor heat exchanger (6a), which acts as an evaporator, cools the room.
尚、上記実施例において、切換弁（９ａ）（１０ａ）
。In addition, in the above embodiment, the switching valves (9a) (10a)
.
（９ｂ）（１０ｂ） 、 （９ｃ）（１０ｃ） 、 （
１７ａ）（１８ａ） 、 （１７ｂ）（１８ｂ） 、
（１７ｃ）（１８ｃ）に夫々二方弁を用いたが、この代
わりに切換弁（９ａ）（１０ａ）を三方弁に、切換弁（
９ｂ）（１０ｂ）を三方弁といった具合に計６個の三方
弁を用いても良い。(9b) (10b) , (9c) (10c) , (
17a) (18a), (17b) (18b),
Two-way valves were used for (17c) and (18c), but instead of these, switching valves (9a) and (10a) were changed to three-way valves, and switching valves (
9b) (10b) may be used as a three-way valve, for a total of six three-way valves.
又、上記実施例ではユニット間配管（１１）を高圧ガス
管〈１２〉、低圧ガス管〈１３〉、液管（１６）との３
本の冷媒管で構成したので、複数個の室外熱交換器の容
量を変えることにより複数台の室内ユニットの同時冷房
運転及び同時暖房運転はもとより冷暖房同時運転を任意
の室内ユニットで自由に選択して行なうことができると
共に、冷暖房同時運転時には凝縮器として作用する室内
熱交換器と、蒸発器として作用する室内熱交換器とがシ
リーズ接続されるため熱回収による効率の良い運転を行
なうことができるが、本発明はかかる冷媒回路のみに限
定されるものではない。In addition, in the above embodiment, the inter-unit piping (11) is divided into three, including the high pressure gas pipe <12>, the low pressure gas pipe <13>, and the liquid pipe (16).
Since it is configured with a single refrigerant pipe, by changing the capacity of multiple outdoor heat exchangers, you can freely select not only simultaneous cooling and heating operation of multiple indoor units, but also simultaneous cooling and heating operation with any indoor unit. In addition, during simultaneous heating and cooling operations, the indoor heat exchanger that acts as a condenser and the indoor heat exchanger that acts as an evaporator are connected in series, allowing for efficient operation due to heat recovery. However, the present invention is not limited to such a refrigerant circuit.
（ト）発明の効果
本発明によれば、各室内ユニットの同時暖房運転又は冷
暖房同時運転時、蒸発器として作用している各室外熱交
換器には低圧液冷媒の飽和温度を検出する第１センサと
、夫々の室外熱交換器の切換弁を出た後の冷媒温度を検
出する第２センサとの検出温度差に基づいて夫々の電気
式膨張弁が弁開度調節されているため、各室外熱交換器
の冷媒温度を検出する第２センサは夫々１個でよくセン
サの個数を少なく抑えることができると共に、切換弁に
よる冷媒圧力損失により第２センサの検出温度に誤差が
生じて圧縮機に冷媒が液戻りするのを防止することがで
きる。(G) Effects of the Invention According to the present invention, when each indoor unit is in simultaneous heating or cooling operation, each outdoor heat exchanger functioning as an evaporator has a The opening degree of each electric expansion valve is adjusted based on the detected temperature difference between the sensor and the second sensor that detects the refrigerant temperature after exiting the switching valve of each outdoor heat exchanger. Only one second sensor is required for each of the outdoor heat exchangers to detect the refrigerant temperature, and the number of sensors can be kept to a small number.Also, the refrigerant pressure loss caused by the switching valve causes an error in the temperature detected by the second sensor, and the compressor It is possible to prevent the refrigerant from returning to liquid.
図面は本発明の実施例を示すもので、第１図は空気調和
装置の冷媒回路図、第２図は室外ユニットの断面図であ
る。
（１）・・・室外ユニット、 （２ａ）（２ｂ）・・・
圧縮機、（３ａ）（３ｂ）（３ｃ）−−・室外熱交換器
、 （ｓａ＞（５ｂ）（５ｃ） ・・・室内ユニット、
（６ａ）（６ｂ）（６ｃ）・・・室内熱交換器、（８
）・・・冷媒吸込管、 （８ｇ）（８ｂ）（８ｃ）・・
・吸込分岐管、（９ｇ）（１０ａ） 、 （９ｂ）（１
０ｂ） 、 （９ｃ）（１０ｃ）＝切換弁、（１５ａ）
（１５ｂ）（１５ｃ）・・・電気式膨張弁、 （２０）
−・・バイパス管、 〈２１）・・・補助熱交換器、
（２３〉・・・第１センサ、 （２４ａ）（２４ｂ）（
２４ｃ）・”第２センサ、制御手段。
（２５〉・・・The drawings show an embodiment of the present invention, and FIG. 1 is a refrigerant circuit diagram of an air conditioner, and FIG. 2 is a sectional view of an outdoor unit. (1)...Outdoor unit, (2a)(2b)...
Compressor, (3a) (3b) (3c) --・Outdoor heat exchanger, (sa>(5b) (5c)...Indoor unit,
(6a) (6b) (6c)... Indoor heat exchanger, (8
)...Refrigerant suction pipe, (8g) (8b) (8c)...
・Suction branch pipe, (9g) (10a), (9b) (1
0b), (9c) (10c) = switching valve, (15a)
(15b) (15c)...Electric expansion valve, (20)
-... Bypass pipe, <21)... Auxiliary heat exchanger,
(23>...first sensor, (24a)(24b)(
24c)・"Second sensor, control means. (25>...
Claims (1)
ニットに室内熱交換器を有する複数台の室内ユニットを
接続した空気調和装置において、圧縮機の冷媒吸込管を
分岐させてこの吸込分岐管を複数個の室外熱交換器の夫
々の一端に切換弁を介して接続すると共に複数個の室外
熱交換器の夫々の他端に電気式膨張弁を接続する一方、
圧縮機の吐出冷媒の一部を前記冷媒吸込管へ導くバイパ
ス管に補助熱交換器を設けると共に、このバイパス管に
は補助熱交換器の出口側に第１センサを、前記吸込分岐
管には切換弁の出口側に第２センサを夫々設け、第１セ
ンサと第２センサとの検出温度差に基づいて各電気式膨
張弁の弁開度を制御する制御手段を備えたことを特徴と
する空気調和装置。(1) In an air conditioner in which multiple indoor units each having an indoor heat exchanger are connected to an outdoor unit having a compressor and multiple outdoor heat exchangers, the refrigerant suction pipe of the compressor is branched to draw this suction. Connecting the branch pipe to one end of each of the plurality of outdoor heat exchangers via a switching valve, and connecting an electric expansion valve to the other end of each of the plurality of outdoor heat exchangers,
An auxiliary heat exchanger is provided in a bypass pipe that guides a portion of the refrigerant discharged from the compressor to the refrigerant suction pipe, and a first sensor is provided on the outlet side of the auxiliary heat exchanger in this bypass pipe, and a first sensor is provided in the suction branch pipe. A second sensor is provided on the outlet side of each switching valve, and a control means is provided for controlling the valve opening degree of each electric expansion valve based on the detected temperature difference between the first sensor and the second sensor. Air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1198488A JP2765970B2 (en) | 1989-07-31 | 1989-07-31 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1198488A JP2765970B2 (en) | 1989-07-31 | 1989-07-31 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0363471A true JPH0363471A (en) | 1991-03-19 |
| JP2765970B2 JP2765970B2 (en) | 1998-06-18 |
Family
ID=16391952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1198488A Expired - Lifetime JP2765970B2 (en) | 1989-07-31 | 1989-07-31 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2765970B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003323A (en) * | 1997-01-21 | 1999-12-21 | Mitsubshiki Denki Kabushiki Kaisha | Refrigerating air-conditioning apparatus |
| JP2001227799A (en) * | 2000-02-18 | 2001-08-24 | Fujitsu General Ltd | Multi-chamber type air conditioner |
| WO2006003860A1 (en) | 2004-06-30 | 2006-01-12 | Toshiba Carrier Corporation | Multi-type air conditioner |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4086719B2 (en) * | 2003-06-18 | 2008-05-14 | 三洋電機株式会社 | Air conditioner and control method of air conditioner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60133267A (en) * | 1983-12-21 | 1985-07-16 | ダイキン工業株式会社 | Separate type air conditioner |
| JPS60133269A (en) * | 1983-12-21 | 1985-07-16 | ダイキン工業株式会社 | Separate type air conditioner |
| JPS61110859A (en) * | 1984-11-02 | 1986-05-29 | ダイキン工業株式会社 | Heat recovery type air conditioner |
-
1989
- 1989-07-31 JP JP1198488A patent/JP2765970B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60133267A (en) * | 1983-12-21 | 1985-07-16 | ダイキン工業株式会社 | Separate type air conditioner |
| JPS60133269A (en) * | 1983-12-21 | 1985-07-16 | ダイキン工業株式会社 | Separate type air conditioner |
| JPS61110859A (en) * | 1984-11-02 | 1986-05-29 | ダイキン工業株式会社 | Heat recovery type air conditioner |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003323A (en) * | 1997-01-21 | 1999-12-21 | Mitsubshiki Denki Kabushiki Kaisha | Refrigerating air-conditioning apparatus |
| JP2001227799A (en) * | 2000-02-18 | 2001-08-24 | Fujitsu General Ltd | Multi-chamber type air conditioner |
| WO2006003860A1 (en) | 2004-06-30 | 2006-01-12 | Toshiba Carrier Corporation | Multi-type air conditioner |
| EP1793179A1 (en) * | 2004-06-30 | 2007-06-06 | Toshiba Carrier Corporation | Multi-type air conditioner |
| EP1793179A4 (en) * | 2004-06-30 | 2008-10-22 | Toshiba Carrier Corp | Multi-type air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2765970B2 (en) | 1998-06-18 |
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