JPH0634222A - Air conditioning system and method for replacement of heater thereof - Google Patents
Air conditioning system and method for replacement of heater thereofInfo
- Publication number
- JPH0634222A JPH0634222A JP4189206A JP18920692A JPH0634222A JP H0634222 A JPH0634222 A JP H0634222A JP 4189206 A JP4189206 A JP 4189206A JP 18920692 A JP18920692 A JP 18920692A JP H0634222 A JPH0634222 A JP H0634222A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- heating
- heater
- closing
- heat exchanger
- 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
Classifications
-
- 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
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、空気調和装置及び該
装置に装備されるヒータの交換方法に関し、特に加熱容
器にヒータが内蔵されてなる冷媒加熱部を備えた空気調
和装置におけるヒータの交換対策に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and a method of replacing a heater mounted in the device, and more particularly, to replacing a heater in an air conditioner having a refrigerant heating section having a heater built in a heating container. Regarding measures.
【０００２】[0002]
【従来の技術】従来の空気調和装置として、例えば特開
昭５８−１２００６１号公報で知られているように、圧
縮機と、利用側熱交換器と、膨張機構と、熱源側熱交換
器とが冷媒配管により冷暖房運転可能に接続されてなる
とともに、ヒータが配設された冷媒加熱部を有し、暖房
運転時には上記冷媒加熱部のヒータにより冷媒を加熱し
て、そのガス冷媒を圧縮機にインジェクションすること
により、圧縮機への入力を増加し、暖房能力を高めるよ
うになされたものがある。2. Description of the Related Art As a conventional air conditioner, for example, as known from Japanese Patent Application Laid-Open No. 58-120061, a compressor, a utilization side heat exchanger, an expansion mechanism, and a heat source side heat exchanger. Is connected to a cooling and heating operation by a refrigerant pipe, and has a refrigerant heating section in which a heater is disposed, and during heating operation, the refrigerant of the refrigerant heating section heats the refrigerant, and the gas refrigerant is used as a compressor. Some injections increase the input to the compressor and increase the heating capacity.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記ヒータ
が故障した場合にはその交換を行う必要があるが、ヒー
タは冷媒を効率よく加熱するため常に冷媒に接触した状
態にある。従って、このような状態のヒータを交換する
には、上記従来例では冷媒を冷媒回路から抜くことを要
し、それを冷媒が外部に漏れないように行わなければな
らず、装置の設置現場においてヒータの交換を行うのが
困難であるという問題がある。If the heater fails, it must be replaced, but the heater is always in contact with the refrigerant in order to efficiently heat the refrigerant. Therefore, in order to replace the heater in such a state, it is necessary to remove the refrigerant from the refrigerant circuit in the above-mentioned conventional example, and it must be performed so that the refrigerant does not leak to the outside. There is a problem that it is difficult to replace the heater.
【０００４】この発明は斯かる点に鑑みてなされたもの
で、その目的は、冷媒回路の構成を改良することで、冷
媒を冷媒回路から抜くことなく、ヒータの交換を行うこ
とができるようにすることにある。The present invention has been made in view of the above problems, and an object thereof is to improve the structure of the refrigerant circuit so that the heater can be replaced without removing the refrigerant from the refrigerant circuit. To do.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、請求項１の発明に係る空気調和装置では、冷房サ
イクルによるポンプダウン運転により冷媒が排除される
冷媒回路の部分に、冷媒加熱部を介設した。In order to achieve the above-mentioned object, in the air conditioner according to the invention of claim 1, the refrigerant heating is performed in the portion of the refrigerant circuit where the refrigerant is removed by the pump down operation in the cooling cycle. The department was installed.
【０００６】具体的には、この発明では、図１に示すよ
うに、圧縮機（１）、利用側熱交換器（２）、膨張機構
（３）及び熱源側熱交換器（４）が冷媒配管（７）によ
り冷暖房運転可能に接続されてなる冷媒回路（８）に、
該冷媒回路（８）内の冷媒を加熱する冷媒加熱部（５）
と、該加熱部（５）により加熱された冷媒を液冷媒及び
ガス冷媒として貯溜する冷媒貯溜部（６）とを備え、上
記冷媒加熱部（５）は加熱容器（５ａ）にヒータ（５
ｂ）が脱着可能に内蔵されてなり、暖房運転時に圧縮機
（１）にインジェクションするようにした空気調和装置
が前提である。Specifically, in the present invention, as shown in FIG. 1, the compressor (1), the utilization side heat exchanger (2), the expansion mechanism (3) and the heat source side heat exchanger (4) are refrigerants. To the refrigerant circuit (8) connected by the pipe (7) so that the air conditioning operation is possible,
Refrigerant heating section (5) for heating the refrigerant in the refrigerant circuit (8)
And a refrigerant storage section (6) for storing the refrigerant heated by the heating section (5) as a liquid refrigerant and a gas refrigerant, the refrigerant heating section (5) being provided in a heating container (5a) with a heater (5).
It is premised on an air conditioner in which b) is detachably incorporated and is injected into the compressor (1) during heating operation.
【０００７】そして、上記冷媒加熱部（５）を冷房サイ
クルによるポンプダウン時に低圧側となる液冷媒配管
（７ａ）に介設するとともに、上記冷媒加熱部（５）の
上記ポンプダウン時に流入側となる液冷媒配管（７ａ）
を開閉する第１閉鎖弁（９）と、上記冷媒加熱部（５）
の上記ポンプダウン時に流出側となる冷媒配管（７）を
開閉する第２閉鎖弁（１０）とを備えた構成とする。The refrigerant heating section (5) is provided in the liquid refrigerant pipe (7a) which is on the low pressure side during pump down in the cooling cycle, and is connected to the inflow side during the pump down of the refrigerant heating section (5). Liquid refrigerant piping (7a)
First closing valve (9) for opening and closing, and the refrigerant heating section (5)
The second closing valve (10) for opening and closing the refrigerant pipe (7) on the outflow side when the pump is down.
【０００８】また、請求項２の発明では、上記請求項１
の発明に係る空気調和装置のヒータを交換する方法であ
って、第１閉鎖弁（９）を閉作動した後に冷房サイクル
によるポンプダウン運転を行い、該ポンプダウンが終了
した後に第２閉鎖弁（１０）を閉作動して、加熱容器
（５ａ）に対しヒータ（５ｂ）を交換し、次いで、第１
及び第２閉鎖弁（９），（１０）間の冷媒加熱部（５）
側の冷媒配管（７）内の空気を排出した後、第１及び第
２閉鎖弁（９），（１０）をそれぞれ開作動する構成と
する。According to the invention of claim 2, the above-mentioned claim 1
In the method for replacing the heater of the air conditioner according to the invention, the pump closing operation by the cooling cycle is performed after the first closing valve (9) is closed, and the second closing valve ( 10) is closed to replace the heater (5b) with respect to the heating container (5a), and then the first
And the refrigerant heating part (5) between the second closing valves (9) and (10)
After the air in the side refrigerant pipe (7) is discharged, the first and second closing valves (9), (10) are opened.
【０００９】請求項３の発明では、図３に示すように、
圧縮機（１）、利用側熱交換器（２）、膨張機構（３）
及び熱源側熱交換器（４）が冷媒配管（７）により冷暖
房運転可能に接続されてなる冷媒回路（８）に、該冷媒
回路（８）内の冷媒を加熱する冷媒加熱部（５）と、該
加熱部（５）により加熱された冷媒を液冷媒及びガス冷
媒として貯溜する冷媒貯溜部（６）とを備え、上記冷媒
加熱部（５）は加熱容器（５ａ）にヒータ（５ｂ）が一
体に内蔵されてなり、暖房運転時に圧縮機（１）にイン
ジェクションするようにした空気調和装置が前提であ
る。According to the invention of claim 3, as shown in FIG.
Compressor (1), use side heat exchanger (2), expansion mechanism (3)
And a refrigerant heating section (5) for heating the refrigerant in the refrigerant circuit (8) to a refrigerant circuit (8) in which the heat source side heat exchanger (4) is connected by a refrigerant pipe (7) so as to be capable of cooling and heating operation. A refrigerant reservoir (6) that stores the refrigerant heated by the heating unit (5) as a liquid refrigerant and a gas refrigerant, and the refrigerant heating unit (5) includes a heating container (5a) and a heater (5b). It is premised on an air conditioner that is integrally built in and that is injected into the compressor (1) during heating operation.
【００１０】そして、上記冷媒加熱部（５）を冷房サイ
クルによるポンプダウン時に低圧側となる液冷媒配管
（７ａ）に介設するとともに、上記冷媒加熱部（５）の
上記ポンプダウン時に流入側となる液冷媒配管（７ａ）
を開閉する第１閉鎖弁（９）と、上記冷媒加熱部（５）
の上記ポンプダウン時に流出側となる冷媒配管（７）を
開閉する第２閉鎖弁（１０）とを備え、上記冷媒加熱部
（５）を第１閉鎖弁（９）及び利用側熱交換器（２）
に、接続部（１１），（１１）を介して分離可能に接続
されているように構成する。The refrigerant heating section (5) is provided in the liquid refrigerant pipe (7a) which is on the low pressure side during pump down in the cooling cycle, and is connected to the inflow side during the pump down of the refrigerant heating section (5). Liquid refrigerant piping (7a)
First closing valve (9) for opening and closing, and the refrigerant heating section (5)
And a second closing valve (10) for opening and closing the refrigerant pipe (7) on the outflow side when the pump is down, and the refrigerant heating section (5) is connected to the first closing valve (9) and the use side heat exchanger ( 2)
To be separably connected via the connecting portions (11) and (11).
【００１１】また、請求項４の発明では、上記請求項３
の発明の空気調和装置のヒータを交換する方法であっ
て、第１閉鎖弁（９）を閉作動した後に冷房サイクルに
よるポンプダウン運転を行い、該ポンプダウンが終了し
た後に第２閉鎖弁（１０）を閉作動して、冷媒加熱部
（５）を両接続部（１１），（１１）にて冷媒回路
（８）に対し交換し、第１及び第２閉鎖弁（９），（１
０）間の冷媒加熱部（５）側の冷媒配管（７）内の空気
を排出した後、第１及び第２閉鎖弁（９），（１０）を
それぞれ開作動して、ヒータ（５ｂ）の交換を行う構成
とする。According to the invention of claim 4, the above-mentioned claim 3 is adopted.
The method for replacing the heater of the air conditioner according to the invention, wherein the pump closing operation by the cooling cycle is performed after the first closing valve (9) is closed, and the second closing valve (10) after the pump down is completed. ) Is closed to replace the refrigerant heating part (5) with the refrigerant circuit (8) at both connection parts (11) and (11), and the first and second closing valves (9) and (1) are replaced.
0), the air in the refrigerant pipe (7) on the refrigerant heating section (5) side is discharged, and then the first and second closing valves (9) and (10) are opened to open the heater (5b). Shall be replaced.
【００１２】[0012]
【作用】請求項１及び２の発明では、冷房サイクルによ
るポンプダウン運転により、冷媒加熱部（５）は低圧側
となって冷媒が排除される。このとき、第１閉鎖弁
（９）を閉作動しておくことにより、冷媒回路（８）内
の冷媒は第１閉鎖弁（９）の箇所で止められて冷媒加熱
部（５）に流入せず、かつ該冷媒加熱部（５）の冷媒は
熱源側熱交換器（４）及び冷媒貯溜部（６）の側に回収
される。これにより、冷媒回路（８）から冷媒を抜くこ
となく、上記冷媒加熱部（５）では冷媒が排除された状
態となる。また、上記ポンプダウンが終了した後に、第
２閉鎖弁（１０）の閉作動により、第１及び第２閉鎖弁
（９），（１０）間の冷媒加熱部（５）側の冷媒回路
（８）では冷媒が排除された状態に保持される一方、上
記回収された冷媒はヒータ（５ｂ）の交換作業中に外部
に漏れない状態で保管される。In the first and second aspects of the invention, the refrigerant heating section (5) is at a low pressure side and the refrigerant is removed by the pump down operation in the cooling cycle. At this time, by closing the first closing valve (9), the refrigerant in the refrigerant circuit (8) is stopped at the position of the first closing valve (9) and flows into the refrigerant heating section (5). However, the refrigerant in the refrigerant heating section (5) is recovered to the heat source side heat exchanger (4) and the refrigerant storage section (6). As a result, the refrigerant is removed from the refrigerant heating section (5) without removing the refrigerant from the refrigerant circuit (8). Further, after the pump down is completed, the second closing valve (10) is closed to cause the refrigerant circuit (8) on the refrigerant heating section (5) side between the first and second closing valves (9) and (10). In (), the refrigerant is retained in a removed state, while the recovered refrigerant is stored in a state where it does not leak outside during the replacement work of the heater (5b).
【００１３】以上の状態において、上記冷媒加熱部
（５）が加熱容器（５ａ）にヒータ（５ｂ）が脱着可能
に内蔵されてなるものである場合に、冷媒回路（８）の
冷媒配管（７）に接続された状態にある加熱容器（５
ａ）に対してヒータ（５ｂ）の脱着を行うことにより、
該ヒータ（５ｂ）の交換が行われる。In the above state, when the refrigerant heating section (5) is constructed such that the heater (5b) is detachably incorporated in the heating container (5a), the refrigerant pipe (7) of the refrigerant circuit (8). ) Connected to the heating container (5
By attaching and detaching the heater (5b) to a),
The heater (5b) is replaced.
【００１４】そして、第１及び第２閉鎖弁（９），（１
０）間の冷媒加熱部（５）側の冷媒回路（８）から空気
が排出された後に、各閉鎖弁（９），（１０）がそれぞ
れ開作動されて交換作業が終わる。Then, the first and second closing valves (9), (1
After the air is discharged from the refrigerant circuit (8) on the side of the refrigerant heating section (5) between 0), the closing valves (9) and (10) are opened and the replacement work is completed.
【００１５】また、請求項３及び４の発明では、上記冷
媒加熱部（５）が加熱容器（５ａ）にヒータ（５ｂ）が
一体に内蔵されてなるものである場合に、該加熱部
（５）自体を両接続部（１１），（１１）において冷媒
回路（８）に対し交換する、つまり冷媒加熱部（５）自
体をそっくり交換することにより、ヒータ（５ｂ）の交
換が行われる。Further, in the inventions of claims 3 and 4, when the refrigerant heating section (5) is formed by integrally incorporating the heater (5b) in the heating container (5a), the heating section (5) is ) Itself is exchanged for the refrigerant circuit (8) at both connection parts (11), (11), that is, the refrigerant heating part (5) itself is completely replaced, whereby the heater (5b) is replaced.
【００１６】[0016]
（実施例１）図１は、この実施例に係る空気調和装置を
示し、該装置は、圧縮機（１）と、アキュムレータ（１
２）と、冷房運転時には同図に実線で示すように、また
暖房運転時には同図に破線で示すように切換わる四路切
換弁（１３）と、冷房運転時には蒸発器として、また暖
房運転時には凝縮器として機能する室内側熱交換器
（２）（利用側熱交換器）と、冷媒の加熱を行う冷媒加
熱器（５）（冷媒加熱部）と、減圧部（１４）と、冷房
運転時には凝縮器として、また暖房運転時には蒸発器と
して機能する室外側熱交換器（４）（熱源側熱交換器）
とが順に液及びガス冷媒配管（７ａ），（７ｂ）により
冷媒の循環が可能なように接続されてなる冷媒回路
（８）を備えている。(Embodiment 1) FIG. 1 shows an air conditioner according to this embodiment, which comprises a compressor (1) and an accumulator (1
2), a four-way switching valve (13) that switches as shown by the solid line in the figure during the cooling operation, and as shown by the broken line in the figure during the heating operation, as an evaporator during the cooling operation, and during the heating operation. An indoor heat exchanger (2) (use side heat exchanger) that functions as a condenser, a refrigerant heater (5) (refrigerant heating section) that heats the refrigerant, a decompression section (14), and during cooling operation. Outdoor heat exchanger (4) that functions as a condenser and an evaporator during heating operation (heat source side heat exchanger)
Is provided with a refrigerant circuit (8) in which liquid and gas refrigerant pipes (7a) and (7b) are connected in order so that the refrigerant can be circulated.
【００１７】上記減圧部（１４）は、４個の逆止弁（１
５）が配設されたブリッジ回路（１６）と、このブリッ
ジ回路（１６）に始端（ａ）と終端（ｂ）とが接続され
た整流路（１７）とからなり、冷媒が冷房サイクル及び
暖房サイクルのいずれにおいても、常に整流路（１７）
を一方向に流れるように構成されている。整流路（１
７）には、始端（ａ）から順に受液器（６）と電動膨張
弁（３）（膨張機構）とが介設されている。上記受液器
（６）は、冷媒加熱器（５）により加熱された冷媒を液
冷媒及びガス冷媒として貯溜する冷媒貯溜部の機能を果
たす。The pressure reducing section (14) includes four check valves (1
5) is provided with a bridge circuit (16), and a rectifying path (17) in which a starting end (a) and a terminating end (b) are connected to the bridge circuit (16). Rectifier (17) always in every cycle
Is configured to flow in one direction. Rectifier (1
At 7), a liquid receiver (6) and an electric expansion valve (3) (expansion mechanism) are provided in this order from the starting end (a). The liquid receiver (6) functions as a refrigerant reservoir that stores the refrigerant heated by the refrigerant heater (5) as a liquid refrigerant and a gas refrigerant.
【００１８】上記受液器（６）のガス貯溜部にはインジ
ェクションバイパス路（１８）の一端が接続される一
方、該バイパス路（１８）の他端は圧縮機（１）の中間
圧部に接続されており、このインジェクションバイパス
路（１８）により、該バイパス路（１８）両端の高低差
圧によって受液器（６）内のガス冷媒が上記中間圧部に
インジェクションされるように構成されている。One end of the injection bypass passage (18) is connected to the gas reservoir of the liquid receiver (6), while the other end of the bypass passage (18) is connected to the intermediate pressure portion of the compressor (1). The injection bypass passage (18) is connected so that the gas refrigerant in the liquid receiver (6) is injected into the intermediate pressure portion due to the high and low differential pressure at both ends of the bypass passage (18). There is.
【００１９】この発明の特徴として、上記冷媒加熱器
（５）は減圧部（１４）と室内側熱交換器（２）との
間、つまり冷房サイクルによるポンプダウン時に低圧側
となる液冷媒配管（７ａ）に介設されている。この冷媒
加熱器（５）は、図２に示すように、内部が液冷媒配管
（７ａ）に連通する有底円筒状の加熱容器（５ａ）と、
該容器（５ａ）の一端側の壁に貫通状態で着脱可能に取
付けられたヒータ（５ｂ）とを備えている。つまり、加
熱容器（５ａ）の上記壁にはねじ孔（１９ａ）が貫通形
成されている一方、ヒータ（５ｂ）の基端側には上記ね
じ孔（１９ａ）に螺合する雄ねじ部（１９ｂ）が形成さ
れており、この雄ねじ部（１９ｂ）のねじ孔（１９ａ）
への螺合締結によりヒータ（５ｂ）が加熱容器（５ａ）
に着脱可能に取付けられている。同図の（２０）はヒー
タ（５ｂ）の基端に一体に形成されたボルト部である。As a feature of the present invention, the refrigerant heater (5) is located between the pressure reducing section (14) and the indoor heat exchanger (2), that is, the liquid refrigerant pipe (which becomes the low pressure side when pumping down in the cooling cycle). 7a). As shown in FIG. 2, this refrigerant heater (5) has a bottomed cylindrical heating container (5a) whose inside communicates with the liquid refrigerant pipe (7a),
The container (5a) is provided with a heater (5b) detachably attached to a wall on one end side in a penetrating state. That is, a screw hole (19a) is formed through the wall of the heating container (5a), while a male screw portion (19b) screwed into the screw hole (19a) is formed on the proximal end side of the heater (5b). Is formed, and the screw hole (19a) of this male screw part (19b) is formed.
The heater (5b) is screwed into the heating container (5a).
It is detachably attached to. Reference numeral (20) in the figure denotes a bolt portion integrally formed at the base end of the heater (5b).
【００２０】また、減圧部（１４）と冷媒加熱器（５）
との間、つまり上記ポンプダウン時に該加熱器（５）の
流入側となる液冷媒配管（７ａ）の途中部位には該配管
（７ａ）を開閉する第１閉鎖弁（９）が配設されてい
る。一方、室内側熱交換器（２）と四路切換弁（１３）
との間、つまり同ポンプダウン時に該加熱器（５）の流
出側となるガス冷媒配管（７ｂ）の途中部位には該配管
（７ｂ）を開閉する第２閉鎖弁（１０）が配設されてい
る。尚、図１において、（２１）はフレア継手部であ
り、室内ユニット（Ａ）と室外ユニット（Ｂ）とを該空
気調和装置の設置現場で互いに接続する際に使用され
る。Further, the pressure reducing section (14) and the refrigerant heater (5)
, That is, in the middle of the liquid refrigerant pipe (7a) on the inflow side of the heater (5) when the pump is down, a first closing valve (9) for opening and closing the pipe (7a) is provided. ing. Meanwhile, the indoor heat exchanger (2) and the four-way switching valve (13)
A second shut-off valve (10) for opening and closing the gas refrigerant pipe (7b) on the outflow side of the heater (5) when the pump is down. ing. In FIG. 1, (21) is a flare joint portion, which is used when the indoor unit (A) and the outdoor unit (B) are connected to each other at the installation site of the air conditioner.
【００２１】以上のように構成された空気調和装置の作
動について説明する。冷房運転時には、四路切換弁（１
３）が図１の実線位置に切換作動され、冷媒は冷媒回路
（８）を同図に矢印で示す方向に循環する。すなわち、
圧縮機（１）から吐出された冷媒は室外側熱交換器
（４）に流入して凝縮し、室内側熱交換器（２）で蒸発
して室内空気を冷房する。The operation of the air conditioner configured as above will be described. At the time of cooling operation, the four-way switching valve (1
3) is switched to the position shown by the solid line in FIG. 1, and the refrigerant circulates in the refrigerant circuit (8) in the direction shown by the arrow in the figure. That is,
The refrigerant discharged from the compressor (1) flows into the outdoor heat exchanger (4) to be condensed, and is evaporated in the indoor heat exchanger (2) to cool the indoor air.
【００２２】暖房運転時には、四路切換弁（１３）が図
１の破線位置に切換作動され、冷媒は冷媒回路（８）を
冷房運転時とは逆の方向に循環する。すなわち、冷媒は
圧縮機（１）から吐出されて室内側熱交換器（２）に流
入し、該熱交換器（２）で凝縮して室内空気を加熱し、
ブリッジ回路（１６）を経て受液器（６）に流入する。
この受液器（６）において、冷媒の一部はガス冷媒の状
態で、また残りは液冷媒の状態でそれぞれ貯溜される。
この液冷媒は整流路（１７）の電動膨張弁（３）に流入
し、該膨張弁（３）で減圧される。減圧後の冷媒は、室
外側熱交換器（４）で蒸発する。また受液器（６）内の
ガス冷媒は、インジェクションバイパス路（１８）を通
って圧縮機（１）の中間圧部にインジェクションされ
る。これにより、圧縮機（１）入力が増加されて暖房能
力が高められる。During the heating operation, the four-way switching valve (13) is switched to the position shown by the broken line in FIG. 1, and the refrigerant circulates in the refrigerant circuit (8) in the direction opposite to that during the cooling operation. That is, the refrigerant is discharged from the compressor (1) and flows into the indoor heat exchanger (2), is condensed in the heat exchanger (2), and heats the indoor air,
It flows into the liquid receiver (6) through the bridge circuit (16).
In this liquid receiver (6), a part of the refrigerant is stored in the state of gas refrigerant and the rest is stored in the state of liquid refrigerant.
This liquid refrigerant flows into the electric expansion valve (3) of the rectification path (17) and is decompressed by the expansion valve (3). The decompressed refrigerant evaporates in the outdoor heat exchanger (4). Further, the gas refrigerant in the liquid receiver (6) is injected into the intermediate pressure portion of the compressor (1) through the injection bypass passage (18). As a result, the compressor (1) input is increased and the heating capacity is enhanced.
【００２３】そして、ヒータ（５ｂ）が故障等で交換す
る際の手順を説明すると、先ず、第１閉鎖弁（９）によ
り冷媒加熱器（５）の減圧部（１４）側の液冷媒配管
（７ａ）を閉鎖するとともに、四路切換弁（１３）を冷
房運転側（図１の実線側）に切換作動させ、この状態で
ポンプダウン運転を行う。すると、冷媒加熱器（５）及
び室内側熱交換器（２）の冷媒は圧縮機（１）を通って
室外側熱交換器（４）及び受液器（６）の側に回収され
る。このとき、第１閉鎖弁（９）が閉鎖されているため
に上記冷媒加熱器（５）及び室内側熱交換器（２）側の
冷媒回路（８）には新たな冷媒は流入せず、従って、こ
のことにより、冷媒加熱器（５）では冷媒が排除された
状態となる。The procedure for replacing the heater (5b) due to a failure or the like will be described. First, the liquid refrigerant pipe (on the side of the pressure reducing section (14) of the refrigerant heater (5) by the first closing valve (9) ( 7a) is closed, the four-way switching valve (13) is switched to the cooling operation side (solid line side in FIG. 1), and the pump down operation is performed in this state. Then, the refrigerant in the refrigerant heater (5) and the indoor heat exchanger (2) passes through the compressor (1) and is recovered by the outdoor heat exchanger (4) and the liquid receiver (6). At this time, since the first closing valve (9) is closed, new refrigerant does not flow into the refrigerant heater (5) and the refrigerant circuit (8) on the indoor heat exchanger (2) side, Therefore, as a result, the refrigerant is removed from the refrigerant heater (5).
【００２４】ポンプダウンが終了した後、第２閉鎖弁
（１０）により室内側熱交換器（２）と四路切換弁（１
３）との間のガス冷媒配管（７ｂ）を閉鎖する。このこ
とで、第１及び第２閉鎖弁（９），（１０）間の冷媒加
熱器（５）及び室内側熱交換器（２）側の冷媒回路
（８）では冷媒が排除された状態に保持される一方、排
除されて上記室外側熱交換器（４）及び受液器（６）の
側に回収された冷媒は、ヒータ（５ｂ）の交換作業中は
外部に漏れない状態に保管される。そこで、冷媒加熱器
（５）のボルト（２０）を回し操作してヒータ（５ｂ）
の雄ねじ部（１９ｂ）と容器（５ａ）のねじ孔（１９
ａ）との螺合締結を緩め、該ヒータ（５ｂ）を加熱容器
（５ａ）から抜き出す。そして、新たな交換用のヒータ
（５ｂ）を逆の手順で上記加熱容器（５ａ）に装着固定
する。After the pump down is completed, the indoor heat exchanger (2) and the four-way switching valve (1) are opened by the second closing valve (10).
3) The gas refrigerant pipe (7b) is closed. As a result, the refrigerant is removed from the refrigerant heater (5) between the first and second closing valves (9) and (10) and the refrigerant circuit (8) on the indoor heat exchanger (2) side. While being held, the refrigerant that has been removed and recovered on the outdoor heat exchanger (4) and liquid receiver (6) sides is stored in a state where it does not leak to the outside during the replacement work of the heater (5b). It Then, the bolt (20) of the refrigerant heater (5) is rotated to operate the heater (5b).
Male screw part (19b) and the screw hole (19) of the container (5a).
Loosen the screwed connection with a), and pull out the heater (5b) from the heating container (5a). Then, a new replacement heater (5b) is attached and fixed to the heating container (5a) in the reverse order.
【００２５】次に、第１及び第２閉鎖弁（９），（１
０）間の冷媒加熱器（５）及び室内側熱交換器（２）側
の冷媒回路（８）内の空気を、エアパージ又は真空引き
等により排出した後、第１及び第２閉鎖弁（９），（１
０）をそれぞれ開作動する。これにより、冷媒を冷媒回
路（８）から抜くことなく、ヒータ（５ｂ）の交換を行
うことができる。Next, the first and second closing valves (9), (1
0) between the refrigerant heater (5) and the indoor heat exchanger (2) side of the refrigerant circuit (8) is discharged by air purging or vacuuming, and then the first and second closing valves (9). ), (1
0) open each. This allows the heater (5b) to be replaced without removing the refrigerant from the refrigerant circuit (8).
【００２６】（実施例２）図３は、この実施例に係る空
気調和装置を示し、実施例１と共通な部分には同じ符号
を付して説明は省略する。(Embodiment 2) FIG. 3 shows an air conditioner according to this embodiment. The parts common to those of the embodiment 1 are designated by the same reference numerals and the description thereof will be omitted.
【００２７】この実施例では、冷媒加熱器（５）は加熱
容器（５ａ）にヒータ（５ｂ）が一体に内蔵されてなっ
ている。そして、この発明の特徴として、冷媒加熱器
（５）は第１閉鎖弁（９）及び室内側熱交換器（２）に
フレア継手部（１１），（１１）（接続部）を介して分
離可能に接続されている。つまり、この実施例では、第
１閉鎖弁（９）と冷媒加熱器（５）との間、及び該加熱
器（５）と室内側熱交換器（２）との間の各液冷媒配管
（７ａ）の途中部位に、各液冷媒配管（７ａ）を上記部
位において断接可能なフレア継手部（１１）がそれぞれ
介設されている。尚、この実施例では、加熱器（５）と
室内側熱交換器（２）との間の側の接続部としての継手
部（１１）は、室内ユニット（Ａ）と室外ユニット
（Ｂ）とを互いに接続する際に使用されるフレア継手部
（１１），（２１）のうち、液冷媒配管（７ａ）側のも
のと兼用している。In this embodiment, the refrigerant heater (5) has a heater (5a) and a heater (5b) integrally incorporated therein. Further, as a feature of the present invention, the refrigerant heater (5) is separated from the first closing valve (9) and the indoor heat exchanger (2) through flare joints (11) and (11) (connection). Connected possible. In other words, in this embodiment, each liquid refrigerant pipe (between the first closing valve (9) and the refrigerant heater (5) and between the heater (5) and the indoor heat exchanger (2) ( Flare joints (11) capable of connecting and disconnecting the respective liquid refrigerant pipes (7a) at the above-mentioned portions are respectively provided in the middle of 7a). In addition, in this embodiment, the joint portion (11) as a connection portion on the side between the heater (5) and the indoor heat exchanger (2) includes an indoor unit (A) and an outdoor unit (B). Of the flare joints (11) and (21) used when connecting the two together, they are also used as those on the liquid refrigerant pipe (7a) side.
【００２８】この実施例では、ヒータ（５ｂ）は加熱容
器（５ａ）と共に、つまり冷媒加熱器（５）自体がそっ
くり交換される。すなわち、第２閉鎖弁（１０）を閉作
動した後、冷媒加熱器（５）を該加熱器（５）近傍の両
配管（７ａ），（７ａ）と共に両継手部（１１），（１
１）において冷媒回路（８）側の両液冷媒配管（７
ａ），（７ａ）から取外し、新たな交換用の冷媒加熱器
（５）を両継手部（１１），（１１）において両液冷媒
配管（７ａ），（７ａ）に接続することにより、上記ヒ
ータ（５ｂ）の交換が行われる。In this embodiment, the heater (5b) together with the heating vessel (5a), that is, the refrigerant heater (5) itself is completely replaced. That is, after the second closing valve (10) is closed, the refrigerant heater (5) together with both pipes (7a) and (7a) in the vicinity of the heater (5) are joined to both joint parts (11) and (1).
In 1), both liquid refrigerant pipes (7) on the refrigerant circuit (8) side
a) and (7a), and a new replacement refrigerant heater (5) is connected to both liquid refrigerant pipes (7a) and (7a) at both joint parts (11) and (11). The heater (5b) is replaced.
【００２９】尚、上記実施例１及び２では、第１及び第
２閉鎖弁を冷媒配管の途中部位にそれぞれ配設している
が、例えば上記実施例１の第１閉鎖弁は、冷媒加熱部と
該加熱部の冷房サイクルによるポンプダウン時に流入側
となる液冷媒配管との間に介設してもよい。In the first and second embodiments, the first and second closing valves are arranged in the middle of the refrigerant pipe, respectively. For example, the first closing valve in the first embodiment has a refrigerant heating section. And the liquid refrigerant pipe on the inflow side when the pump is down in the cooling cycle of the heating unit.
【００３０】また、上記実施例２では、各接続部を液冷
媒配管の途中部位に配設しているが、上記液冷媒配管と
冷媒加熱部との間に介設してもよい。さらに、この接続
部については、上記実施例２ではフレア継手を用いてい
るが、その他の継手を用いてもよい。Further, in the second embodiment, each connecting portion is arranged at an intermediate portion of the liquid refrigerant pipe, but it may be provided between the liquid refrigerant pipe and the refrigerant heating portion. Further, although the flare joint is used for the connecting portion in the second embodiment, other joints may be used.
【００３１】[0031]
【発明の効果】以上説明したように、請求項１及び２の
発明では、第１閉鎖弁を閉作動して冷房サイクルによる
ポンプダウン運転を行うことにより、冷媒加熱部の冷媒
を排除して熱源側熱交換器及び冷媒貯溜部側の冷媒回路
に回収することができ、かつ第２閉鎖弁を閉作動して回
収された冷媒を外部に漏れない状態で冷媒回路内に保管
することができるので、冷媒を冷媒回路から抜くことな
く容易に、かつ冷媒を外部に漏らすことなく安全に、冷
媒回路に接続された状態の加熱容器に対してヒータの交
換を行うことができる。As described above, according to the first and second aspects of the present invention, the first closing valve is closed to perform the pump down operation by the cooling cycle, so that the refrigerant in the refrigerant heating section is removed and the heat source is removed. Since the refrigerant can be recovered in the refrigerant circuit on the side heat exchanger and the refrigerant storage section side, and the recovered refrigerant can be stored in the refrigerant circuit in a state of not leaking to the outside by closing the second closing valve. The heater can be replaced with respect to the heating container connected to the refrigerant circuit easily without removing the refrigerant from the refrigerant circuit and safely without leaking the refrigerant to the outside.
【００３２】また、請求項３及び４の発明では、冷媒加
熱部が加熱容器にヒータを一体に内蔵してなるものであ
る場合に、冷媒加熱部自体を冷媒回路に対して交換する
ことにより、容易かつ安全にヒータの交換を行うことが
できる。Further, in the inventions of claims 3 and 4, when the refrigerant heating portion is one in which the heater is integrally built in the heating container, the refrigerant heating portion itself is exchanged for the refrigerant circuit. The heater can be replaced easily and safely.
【図１】この発明の実施例１に係る空気調和装置の冷媒
回路図である。FIG. 1 is a refrigerant circuit diagram of an air conditioner according to a first embodiment of the present invention.
【図２】冷媒加熱器の要部を部分的に拡大して示す縱断
面図である。FIG. 2 is a vertical cross-sectional view showing a partially enlarged main part of the refrigerant heater.
【図３】この発明の実施例２に係る空気調和装置の冷媒
回路図である。FIG. 3 is a refrigerant circuit diagram of an air conditioner according to a second embodiment of the present invention.
（１） 圧縮機 （２） 利用側熱交換器（室内側熱交換器） （３） 電動膨張弁（膨張機構） （４） 室外側熱交換器（熱源側熱交換器） （５） 冷媒加熱器（冷媒加熱部） （５ａ） 加熱容器 （５ｂ） ヒータ （６） 受液器（冷媒貯溜部） （７） 冷媒配管 （７ａ） 液冷媒配管 （８） 冷媒回路 （９） 第１閉鎖弁 （１０） 第２閉鎖弁 （１１） フレア継手部（接続部） (1) Compressor (2) Use side heat exchanger (indoor heat exchanger) (3) Electric expansion valve (expansion mechanism) (4) Outdoor heat exchanger (heat source side heat exchanger) (5) Refrigerant heating Container (refrigerant heating part) (5a) Heating container (5b) Heater (6) Liquid receiver (refrigerant reservoir part) (7) Refrigerant piping (7a) Liquid refrigerant piping (8) Refrigerant circuit (9) First closing valve ( 10) Second closing valve (11) Flare joint part (connection part)
Claims (4)
膨張機構（３）及び熱源側熱交換器（４）が冷媒配管
（７）により冷暖房運転可能に接続されてなる冷媒回路
（８）に、該冷媒回路（８）内の冷媒を加熱する冷媒加
熱部（５）と、該加熱部（５）により加熱された冷媒を
液冷媒及びガス冷媒として貯溜する冷媒貯溜部（６）と
を備え、上記冷媒加熱部（５）は加熱容器（５ａ）にヒ
ータ（５ｂ）が脱着可能に内蔵されてなり、暖房運転時
に圧縮機（１）にインジェクションするようにした空気
調和装置において、 上記冷媒加熱部（５）を冷房サイクルによるポンプダウ
ン時に低圧側となる液冷媒配管（７ａ）に介設するとと
もに、 上記冷媒加熱部（５）の上記ポンプダウン時に流入側と
なる液冷媒配管（７ａ）を開閉する第１閉鎖弁（９）
と、 上記冷媒加熱部（５）の上記ポンプダウン時に流出側と
なる冷媒配管（７）を開閉する第２閉鎖弁（１０）とを
備えたことを特徴とする空気調和装置。1. A compressor (1), a utilization side heat exchanger (2),
Refrigerant heating for heating the refrigerant in the refrigerant circuit (8) to a refrigerant circuit (8) in which an expansion mechanism (3) and a heat source side heat exchanger (4) are connected by a refrigerant pipe (7) in a cooling / heating operation. And a refrigerant reservoir (6) for storing the refrigerant heated by the heating unit (5) as a liquid refrigerant and a gas refrigerant, the refrigerant heating unit (5) being provided in a heating container (5a). In the air conditioner in which the heater (5b) is detachably incorporated and is injected into the compressor (1) during the heating operation, the refrigerant heating unit (5) becomes a low pressure side when the pump is down in the cooling cycle. A first closing valve (9) which is interposed in the liquid refrigerant pipe (7a) and which opens and closes the liquid refrigerant pipe (7a) on the inflow side when the refrigerant heating section (5) is pumped down.
And an second closing valve (10) for opening and closing the refrigerant pipe (7) on the outflow side when the refrigerant heating section (5) is pumped down.
交換する方法であって、 第１閉鎖弁（９）を閉作動した後に冷房サイクルによる
ポンプダウン運転を行い、 上記ポンプダウンが終了した後に第２閉鎖弁（１０）を
閉作動して、加熱容器（５ａ）に対しヒータ（５ｂ）を
交換し、 次いで、第１及び第２閉鎖弁（９），（１０）間の冷媒
加熱部（５）側の冷媒回路（８）内の空気を排出した
後、 第１及び第２閉鎖弁（９），（１０）をそれぞれ開作動
することを特徴とする空気調和装置のヒータの交換方
法。2. The method for replacing a heater of an air conditioner according to claim 1, wherein the first shut-off valve (9) is closed and then a pump-down operation is performed by a cooling cycle, and the pump-down is completed. After that, the second closing valve (10) is closed to replace the heater (5b) with respect to the heating container (5a), and then the refrigerant heating section between the first and second closing valves (9) and (10). After discharging the air in the refrigerant circuit (8) on the (5) side, the first and second closing valves (9) and (10) are opened, respectively, to replace the heater of the air conditioner. .
膨張機構（３）及び熱源側熱交換器（４）が冷媒配管
（７）により冷暖房運転可能に接続されてなる冷媒回路
（８）に、該冷媒回路（８）内の冷媒を加熱する冷媒加
熱部（５）と、該加熱部（５）により加熱された冷媒を
液冷媒及びガス冷媒として貯溜する冷媒貯溜部（６）と
を備え、上記冷媒加熱部（５）は加熱容器（５ａ）にヒ
ータ（５ｂ）が一体に内蔵されてなり、暖房運転時に圧
縮機（１）にインジェクションするようにした空気調和
装置において、 上記冷媒加熱部（５）を冷房サイクルによるポンプダウ
ン時に低圧側となる液冷媒配管（７ａ）に介設するとと
もに、 上記冷媒加熱部（５）の上記ポンプダウン時に流入側と
なる液冷媒配管（７ａ）を開閉する第１閉鎖弁（９）
と、 上記冷媒加熱部（５）の上記ポンプダウン時に流出側と
なる冷媒配管（７）を開閉する第２閉鎖弁（１０）とを
備え、 上記冷媒加熱部（５）は第１閉鎖弁（９）及び利用側熱
交換器（２）に、接続部（１１），（１１）を介して分
離可能に接続されていることを特徴とする空気調和装
置。3. A compressor (1), a utilization side heat exchanger (2),
Refrigerant heating for heating the refrigerant in the refrigerant circuit (8) to a refrigerant circuit (8) in which an expansion mechanism (3) and a heat source side heat exchanger (4) are connected by a refrigerant pipe (7) in a cooling / heating operation. And a refrigerant reservoir (6) for storing the refrigerant heated by the heating unit (5) as a liquid refrigerant and a gas refrigerant, the refrigerant heating unit (5) being provided in a heating container (5a). In an air conditioner in which a heater (5b) is integrally incorporated so as to inject into a compressor (1) during heating operation, a liquid which becomes a low pressure side when the refrigerant heating section (5) is pumped down by a cooling cycle. A first closing valve (9) which is interposed in the refrigerant pipe (7a) and which opens and closes the liquid refrigerant pipe (7a) on the inflow side when the pump of the refrigerant heating unit (5) is down.
And a second closing valve (10) that opens and closes the refrigerant pipe (7) on the outflow side when the pump of the refrigerant heating unit (5) is down, and the refrigerant heating unit (5) includes a first closing valve ( 9) and the utilization side heat exchanger (2) are separably connected via connection parts (11) and (11).
交換する方法であって、 第１閉鎖弁（９）を閉作動した後に冷房サイクルによる
ポンプダウン運転を行い、 上記ポンプダウンが終了した後に第２閉鎖弁（１０）を
閉作動して、冷媒加熱部（５）を両接続部（１１），
（１１）にて冷媒回路（８）に対し交換し、 第１及び第２閉鎖弁（９），（１０）間の冷媒加熱部
（５）側の冷媒配管（７）内の空気を排出した後、第１
及び第２閉鎖弁（９），（１０）をそれぞれ開作動し
て、 ヒータ（５ｂ）の交換を行うことを特徴とする空気調和
装置のヒータの交換方法。4. A method for replacing a heater of an air conditioner according to claim 3, wherein a pump down operation by a cooling cycle is performed after closing the first closing valve (9), and the pump down is completed. After that, the second closing valve (10) is closed to connect the refrigerant heating part (5) to both connection parts (11),
The refrigerant circuit (8) was replaced at (11), and the air in the refrigerant pipe (7) on the refrigerant heating section (5) side between the first and second closing valves (9) and (10) was discharged. After the first
And the second closing valves (9), (10) are opened to replace the heater (5b), respectively, to replace the heater of the air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18920692A JP3287018B2 (en) | 1992-07-16 | 1992-07-16 | Air conditioner and heater replacement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18920692A JP3287018B2 (en) | 1992-07-16 | 1992-07-16 | Air conditioner and heater replacement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0634222A true JPH0634222A (en) | 1994-02-08 |
| JP3287018B2 JP3287018B2 (en) | 2002-05-27 |
Family
ID=16237314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18920692A Expired - Fee Related JP3287018B2 (en) | 1992-07-16 | 1992-07-16 | Air conditioner and heater replacement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3287018B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015132959A1 (en) * | 2014-03-07 | 2015-09-11 | 三菱電機株式会社 | Air conditioning device |
| JPWO2015140874A1 (en) * | 2014-03-17 | 2017-04-06 | 三菱電機株式会社 | Air conditioner |
-
1992
- 1992-07-16 JP JP18920692A patent/JP3287018B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015132959A1 (en) * | 2014-03-07 | 2015-09-11 | 三菱電機株式会社 | Air conditioning device |
| JP5797354B1 (en) * | 2014-03-07 | 2015-10-21 | 三菱電機株式会社 | Air conditioner |
| CN106062490A (en) * | 2014-03-07 | 2016-10-26 | 三菱电机株式会社 | Air conditioning apparatus |
| AU2014385084B2 (en) * | 2014-03-07 | 2017-08-03 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| EP3115714A4 (en) * | 2014-03-07 | 2017-11-08 | Mitsubishi Electric Corporation | Air conditioning device |
| US10655900B2 (en) | 2014-03-07 | 2020-05-19 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| JPWO2015140874A1 (en) * | 2014-03-17 | 2017-04-06 | 三菱電機株式会社 | Air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3287018B2 (en) | 2002-05-27 |
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