JPH0447575Y2 - - Google Patents
Info
- Publication number
- JPH0447575Y2 JPH0447575Y2 JP16710585U JP16710585U JPH0447575Y2 JP H0447575 Y2 JPH0447575 Y2 JP H0447575Y2 JP 16710585 U JP16710585 U JP 16710585U JP 16710585 U JP16710585 U JP 16710585U JP H0447575 Y2 JPH0447575 Y2 JP H0447575Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- refrigerant
- outdoor heat
- temperature
- pressure reducer
- 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.)
- Expired
Links
- 239000003507 refrigerant Substances 0.000 claims description 34
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 238000010257 thawing Methods 0.000 claims description 19
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 description 16
- 238000001816 cooling Methods 0.000 description 5
- 239000000155 melt Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は、圧縮機、四方弁、室外熱交換器、減
圧装置、室内熱交換器を順次接続した冷凍装置に
関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to a refrigeration system in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected in sequence.
(ロ) 従来の技術
従来、この種の冷凍装置としては、特公昭57−
47385号公報に示された構造のものがある。すな
わち、圧縮機、四方弁、室外熱交換器、減圧装
置、室内熱交換器を順次配管で接続すると共に、
室外熱交換器と減圧装置とをつなぐ配管にはこの
配管内を流れる冷媒の温度の感温装置を配設され
ていた。(b) Conventional technology Conventionally, this type of refrigeration equipment was developed using the
There is a structure shown in Publication No. 47385. In other words, the compressor, four-way valve, outdoor heat exchanger, pressure reduction device, and indoor heat exchanger are connected in sequence with piping, and
The piping connecting the outdoor heat exchanger and the pressure reducing device is equipped with a temperature sensing device that measures the temperature of the refrigerant flowing through the piping.
そして、除霜運転時は、圧縮機から吐出された
高温の冷媒を室外熱交換器へ流し、この熱交換器
に付着している霜を溶かすようにし、そして室外
熱交換器から流出された冷媒の温度を感温装置で
感知して、この冷媒の温度が一定値以上になつた
時にこの除霜運転を終了させるようにしていた。 During defrosting operation, the high temperature refrigerant discharged from the compressor is flowed to the outdoor heat exchanger to melt the frost attached to the heat exchanger, and the refrigerant discharged from the outdoor heat exchanger is The temperature of the refrigerant is detected by a temperature sensing device, and the defrosting operation is terminated when the temperature of the refrigerant exceeds a certain value.
(ハ) 考案が解決しようとする問題点
このような冷凍装置において、感温装置は除霜
運転時の室外熱交換器の出口側となる配管に配設
されているため、室外熱交換器に付着していた霜
が溶けるとすぐにこの配管内を流れる冷媒の温度
が上昇し、まだ室外熱交換器に溶けたドレンが付
着している状態でも、除霜運転を終了し暖房運転
を開始するおそれがあつた。(c) Problems to be solved by the invention In such a refrigeration system, the temperature sensing device is installed in the piping that is the outlet side of the outdoor heat exchanger during defrosting operation, so As soon as the adhering frost melts, the temperature of the refrigerant flowing in this pipe rises, and even if there is still melted condensate adhering to the outdoor heat exchanger, defrosting operation is ended and heating operation is started. I was afraid.
このように室外熱交換器にドレンが付着したま
まの状態で暖房運転を開始すると、このドレンが
核となつて室外熱交換器に霜が付きやすくなる。 If heating operation is started with condensate still attached to the outdoor heat exchanger in this manner, the condensate becomes a nucleus and frost is likely to form on the outdoor heat exchanger.
本考案は、除霜運転時、室外熱交換器にドレン
を残さないようにして、暖房運転中、室外熱交換
器へ霜が付きにくくすることを目的としたもので
ある。 The purpose of the present invention is to prevent condensate from remaining on the outdoor heat exchanger during defrosting operation, thereby making it difficult for frost to form on the outdoor heat exchanger during heating operation.
(ニ) 問題点を解決するための手段
この目的を達成するために本考案は、ヒートポ
ンプ式冷凍回路の減圧装置を、第１減圧器と、こ
の第１減圧器と室外熱交換器の間に設けられ前記
第１減圧器より抵抗値が小さい第２減圧器とから
構成し、これら両減圧器の間の管路に除霜運転時
に冷媒の温度を感知する感温装置を設け、この冷
媒温度が所定値以上になつたらこの除霜運転を終
了させるようにしたものである。(d) Means for solving the problem In order to achieve this objective, the present invention provides a pressure reducing device for a heat pump type refrigeration circuit between a first pressure reducer and this first pressure reducer and an outdoor heat exchanger. a second pressure reducer having a resistance value lower than that of the first pressure reducer, and a temperature sensing device for sensing the temperature of the refrigerant during defrosting operation is provided in the conduit between the two pressure reducers. The defrosting operation is terminated when the temperature exceeds a predetermined value.
(ホ) 作用
本考案の冷凍回路によれば、除霜運転時、室外
熱交換器に流れ込んだ冷媒によつてこの熱交換器
の霜をとかすと共に、この熱交換器から流れ出て
第２減圧器で減圧された冷媒の温度を感温装置で
感知するようにしたものである。(E) Effect According to the refrigeration circuit of the present invention, during defrosting operation, the refrigerant flowing into the outdoor heat exchanger melts the frost on this heat exchanger, and the refrigerant flows out from the heat exchanger and flows into the second pressure reducer. The temperature of the refrigerant that has been depressurized is sensed by a temperature sensing device.
(ヘ) 実施例
図面は、本考案の冷凍装置を分離型空気調和機
に適用した冷媒回路図で、１は室外ユニツト、２
は室内ユニツト、３は両ユニツトをつなぐユニツ
ト間配管である。(f) Example The drawing is a refrigerant circuit diagram in which the refrigeration system of the present invention is applied to a separate air conditioner.
3 is the indoor unit, and 3 is the inter-unit piping that connects both units.
室内ユニツト２には室内熱交換器４が内蔵され
ている。この室内熱交換器４は冷房時に蒸発器と
して、暖房時に凝縮器として夫々作用される。 The indoor unit 2 has an indoor heat exchanger 4 built therein. This indoor heat exchanger 4 functions as an evaporator during cooling and as a condenser during heating.
５は除霜運転開始用の感温装置で、室内熱交換
器４の熱交換パイプ３０が装着されている。暖房
運転時、感温装置５で感知する温度が45℃以下と
なつた時には、除霜運転を開始するために圧縮機
（後述する）を停止させる。 Reference numeral 5 denotes a temperature sensing device for starting a defrosting operation, to which a heat exchange pipe 30 of the indoor heat exchanger 4 is attached. During the heating operation, when the temperature sensed by the temperature sensing device 5 becomes 45° C. or lower, the compressor (described later) is stopped in order to start the defrosting operation.
室外ユニツト１には以下に述べる機器が内蔵さ
れている。６は圧縮機、７は四方弁、８は室外熱
交換器、９は第１減圧器〔後述するキヤピラリー
チユーブ１５，１７から成る減圧器〕と、この第
１減圧器と室外熱交換器８との間に設けた第２減
圧器〔後述するキヤピラリーチユーブ１４〕とか
ら構成される減圧装置、１０はアキユムレータで
ある。室外熱交換器８は、その内部で冷媒通路１
１が分岐されている。この分岐管１２の接続管１
３には分流用のキヤピラリチユーブ１４が配設さ
れている。１５は暖房用のキヤピラリチユーブ、
１６はこの暖房用のキヤピラリチユーブと並列に
接続された逆止弁で、冷房運転時並びに除霜運転
時に冷媒が流れるようになつている。１７は冷
房・暖房兼用のキヤピラリチユーブで、これらキ
ヤピラリチユーブ１４，１５，１７は直列につな
がれて減圧装置９が構成されている。これらキヤ
ピラリチユーブのうち暖房用のキヤピラリチユー
ブ１５の抵抗値と、冷房・暖房兼用のキヤピラリ
チユーブ１７の抵抗値とは略等しく、又分流用の
キヤピラリチユーブ１４の抵抗値は暖房用のキヤ
ピラリチユーブ１５の抵抗値の約１／４に設定さ
れている。１８は除霜運転時の終了用の感温装置
で、接続管１３の合流点１９と暖房用のキヤピラ
リチユーブ１５との間の配管２０に装着されてお
り、除霜運転時、この感温装置１８で感知する温
度が12℃以上となつた時には除霜運転を終了させ
る。２１はリキツドインジエクシヨン管で、一端
２２は接続管１３の合流点１９と感温装置１８と
の間に、他端２３は圧縮機６のシリンダ室につな
がれている。 The outdoor unit 1 has built-in equipment described below. 6 is a compressor, 7 is a four-way valve, 8 is an outdoor heat exchanger, 9 is a first pressure reducer [a pressure reducer consisting of capillary reach tubes 15 and 17, which will be described later], and this first pressure reducer and the outdoor heat exchanger 8. 10 is an accumulator. The outdoor heat exchanger 8 has a refrigerant passage 1 inside it.
1 is branched. Connection pipe 1 of this branch pipe 12
3 is provided with a capillary tube 14 for diversion. 15 is a heating capillary tube,
Reference numeral 16 denotes a check valve connected in parallel with this heating capillary tube, through which refrigerant flows during cooling operation and defrosting operation. Reference numeral 17 denotes a capillary tube for both cooling and heating, and these capillary tubes 14, 15, and 17 are connected in series to form a pressure reducing device 9. Among these capillary tubes, the resistance value of the heating capillary tube 15 and the resistance value of the cooling/heating capillary tube 17 are approximately equal, and the resistance value of the diversion capillary tube 14 is similar to that of the heating capillary tube 15. It is set to approximately 1/4 of the resistance value of the capillary tube 15. Reference numeral 18 denotes a temperature sensing device for ending the defrosting operation, which is attached to the pipe 20 between the confluence 19 of the connecting pipe 13 and the heating capillary tube 15. When the temperature sensed by the device 18 reaches 12°C or higher, the defrosting operation is terminated. 21 is a liquid injection tube, one end 22 of which is connected between the junction 19 of the connecting tube 13 and the temperature sensing device 18, and the other end 23 connected to the cylinder chamber of the compressor 6.
このような構成を有する空気調和機において、
暖房運転時は四方弁７を破線状態に設定して冷媒
を破線矢印のように流す。そして室外熱交換器８
で熱をくみあげ、室内熱交換器４で放熱して室内
を暖房する。この暖房運転中、室外熱交換器８の
表面温度が外気の露点温度以下に下がり、かつ０
℃以下になると、この熱交換器８の表面に霜が形
成される。この霜の量が増加すると室外熱交換器
８は目づまりをおこし、外気からくみ上げる熱量
が低下する。このため室内熱交換器４の温度も下
がり、この室内熱交換器４の温度が45℃以下とな
つた場合は、圧縮機６を止めて、暖房運転を一時
停止させる。 In an air conditioner having such a configuration,
During heating operation, the four-way valve 7 is set to the broken line state and the refrigerant flows in the direction of the broken line arrow. and outdoor heat exchanger 8
The heat is pumped up by the indoor heat exchanger 4, and the heat is radiated by the indoor heat exchanger 4 to heat the room. During this heating operation, the surface temperature of the outdoor heat exchanger 8 falls below the dew point temperature of the outside air, and
When the temperature drops below .degree. C., frost forms on the surface of the heat exchanger 8. When the amount of this frost increases, the outdoor heat exchanger 8 becomes clogged, and the amount of heat pumped from the outside air decreases. Therefore, the temperature of the indoor heat exchanger 4 also decreases, and when the temperature of the indoor heat exchanger 4 becomes 45° C. or lower, the compressor 6 is stopped and the heating operation is temporarily stopped.
その後一定時間経過後に四方弁７を実線状態に
切り換えて、圧縮機６を運転させて除霜運転には
いる。この除霜運転時は冷媒が実線矢印のように
流れる。すなわち、室外熱交換器８へ圧縮機６か
らの高温高圧の冷媒を流し、室外熱交換器８の霜
をとかす。この時、分流用のキヤピラリチユーブ
１４で、室外熱交換器８の冷媒通路１１並び分岐
管１２内の冷媒の流れを遅くして、この冷媒で室
外熱交換器８の霜をとかしやすくしている。そし
て、キヤピラリチユーブ１４を通過した後の冷媒
の温度を感温装置１８で感知し、この冷媒の温度
が12℃以上となつた時には圧縮機６を止めて除霜
運転を停止させる。このキヤピラリチユーブ１４
の抵抗値は、他の２つのキヤピラリチユーブ１
５，１７の抵抗値よりもかなり小さく、感温装置
１８が取り付けられた配管２０内の冷媒の温度変
化は、室外熱交換器８を出た冷媒の温度変化に追
従しているので、室外熱交換器８の霜のとけぐあ
いをこの配管２０を流れる冷媒の温度で判断して
も支障は少ない。 Thereafter, after a certain period of time has elapsed, the four-way valve 7 is switched to the solid line state, the compressor 6 is operated, and the defrosting operation is started. During this defrosting operation, the refrigerant flows as indicated by the solid line arrow. That is, the high-temperature, high-pressure refrigerant from the compressor 6 is flowed into the outdoor heat exchanger 8 to melt the frost on the outdoor heat exchanger 8 . At this time, the diverting capillary tube 14 slows down the flow of the refrigerant in the refrigerant passages 11 and branch pipes 12 of the outdoor heat exchanger 8, making it easier to melt the frost in the outdoor heat exchanger 8 with this refrigerant. There is. The temperature of the refrigerant after passing through the capillary tube 14 is sensed by the temperature sensing device 18, and when the temperature of the refrigerant reaches 12° C. or higher, the compressor 6 is stopped to stop the defrosting operation. This capillary tube 14
The resistance value of the other two capillary tubes 1
5 and 17, and the temperature change of the refrigerant in the pipe 20 to which the temperature sensing device 18 is attached follows the temperature change of the refrigerant leaving the outdoor heat exchanger 8, so the outdoor heat Even if the degree of frost melting in the exchanger 8 is determined based on the temperature of the refrigerant flowing through the pipe 20, there is little problem.
又、冷房運転時の冷媒の流れは、除霜運転時の
冷媒の流れと同じであるため、その説明は省略す
る。 Further, since the flow of refrigerant during cooling operation is the same as the flow of refrigerant during defrosting operation, a description thereof will be omitted.
(ト) 考案の効果
以上述べたように本考案の冷凍装置によれば、
ヒートポンプ式冷凍回路の減圧装置を、減圧装置
を、第１減圧器と、この第１減圧器と室外熱交換
器との間に設けられ前記第１減圧器より抵抗値が
小さい第２減圧器とで構成し、前記第１減圧器と
第２減圧器との間の管路に冷媒の温度を感知する
感温装置を設けたものである。従つて、室外熱交
換器の近くに位置した第２減圧器で、この熱交換
器内の冷媒の流れを遅くして、この冷媒によつて
この熱交換器の霜を確実にとかして霜残りのおそ
れを少なくすることができる。このように霜残り
のおそれを少なくして、暖房運転時の霜の発生を
遅らせることができる。又、両減圧器の間の管路
内を流れる冷媒の温度を感温装置で検知して除霜
運転を終了させるようにしたので、室外熱交換器
の霜のとけぐあいを確実に感知することができ
る。(G) Effects of the invention As stated above, according to the refrigeration system of the invention,
A pressure reducing device for a heat pump type refrigeration circuit, a first pressure reducing device, and a second pressure reducing device provided between the first pressure reducing device and the outdoor heat exchanger and having a resistance value smaller than the first pressure reducing device. A temperature sensing device for sensing the temperature of the refrigerant is provided in the conduit between the first pressure reducer and the second pressure reducer. Therefore, the second pressure reducer located near the outdoor heat exchanger slows down the flow of refrigerant in this heat exchanger to ensure that the refrigerant melts the frost on this heat exchanger and removes any remaining frost. This can reduce the risk of In this way, the risk of frost remaining can be reduced and the formation of frost during heating operation can be delayed. In addition, since the defrosting operation is terminated by detecting the temperature of the refrigerant flowing in the pipe between the two pressure reducers using a temperature sensing device, melting of the frost on the outdoor heat exchanger can be reliably detected. I can do it.
図面は本考案の冷凍装置の冷媒回路図である。
４……室内熱交換器、６……圧縮機、７……四
方弁、８……室外熱交換器、９……減圧装置、１
４，１５，１７……減圧器（キヤピラリチユー
ブ）、１８……感温装置。
The drawing is a refrigerant circuit diagram of the refrigeration system of the present invention. 4... Indoor heat exchanger, 6... Compressor, 7... Four-way valve, 8... Outdoor heat exchanger, 9... Pressure reducing device, 1
4, 15, 17... pressure reducer (capillary tube), 18... temperature sensing device.
Claims (1)
内熱交換器が冷媒管で順次接続され、前記四方弁
の切り換えで前記室外熱交換器の除霜を行なう冷
媒回路と、前記除霜時に冷媒の温度を検出する感
温装置とを備え、この感温装置で検出する温度が
所定値以上となつた時に前記除霜を終了させる冷
凍装置において、前記減圧装置を、第１減圧器
と、この第１減圧器と前記室外熱交換器との間に
設けられ前記第１減圧器より抵抗値が小さい第２
減圧器とで構成し、前記第１減圧器と第２減圧器
との間の管路に前記感温装置を設けたことを特徴
とする冷凍装置。 A refrigerant circuit in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are sequentially connected by refrigerant pipes, and defrosts the outdoor heat exchanger by switching the four-way valve; A refrigeration device comprising a temperature sensing device for detecting the temperature of the refrigerant, and terminating the defrosting when the temperature detected by the temperature sensing device reaches a predetermined value or higher, wherein the pressure reducing device is a first pressure reducing device; A second pressure reducer is provided between the first pressure reducer and the outdoor heat exchanger and has a resistance value smaller than that of the first pressure reducer.
A refrigeration system comprising a pressure reducer, and the temperature sensing device is provided in a conduit between the first pressure reducer and the second pressure reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16710585U JPH0447575Y2 (en) | 1985-10-30 | 1985-10-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16710585U JPH0447575Y2 (en) | 1985-10-30 | 1985-10-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6276875U JPS6276875U (en) | 1987-05-16 |
| JPH0447575Y2 true JPH0447575Y2 (en) | 1992-11-10 |
Family
ID=31098724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16710585U Expired JPH0447575Y2 (en) | 1985-10-30 | 1985-10-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0447575Y2 (en) |
-
1985
- 1985-10-30 JP JP16710585U patent/JPH0447575Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6276875U (en) | 1987-05-16 |
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