JPH0320578A - Refrigeration device - Google Patents
Refrigeration deviceInfo
- Publication number
- JPH0320578A JPH0320578A JP15378089A JP15378089A JPH0320578A JP H0320578 A JPH0320578 A JP H0320578A JP 15378089 A JP15378089 A JP 15378089A JP 15378089 A JP15378089 A JP 15378089A JP H0320578 A JPH0320578 A JP H0320578A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- cooler
- valve
- liquid
- compressor
- 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
- 238000005057 refrigeration Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000010257 thawing Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 239000003507 refrigerant Substances 0.000 claims description 28
- 238000001704 evaporation Methods 0.000 abstract description 5
- 239000011810 insulating material Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract 2
- 238000004378 air conditioning Methods 0.000 abstract 1
- 239000002023 wood Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Defrosting Systems (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明の冷凍装置は冷蔵倉庫およびその他の建造物の室
内冷却用に使用される．
［従来技術とその欠点〕
冷却器の除霜として冷却器へ圧ｗＡ機からの高圧、高温
冷媒ガス（ホットガス）を供給して行う手段の冷凍装置
においては，除霜時に冷却器を通る間に冷却された冷媒
ガスは凝縮されて液バック現象が．発生し，圧縮機損傷
の原因となる．
Ｅ本発明の目的］
本発明の目的とするところは、ホー，トガスによって除
霜を行う冷凍装置において、除霜時に冷却器を通過した
冷媒が再燕発されて液バック現象を発生することがなく
、しかも冷却器からの冷媒の前記再蒸発は圧縮機からの
ホットガスとの熱交換で行なわれるようにすることによ
り，再蒸発用交換部の構造を簡素化でき、さらに冷却運
転時に冷却器の能力を向」二せしめ得るようにしたこと
にある．
［本発明の構威］
本発明に係る冷凍装置は，冷却運転時には圧縮機からの
冷媒が高圧ガス管，凝縮器，送液管、第１開閉弁、膨彊
弁を経て本クーラーに送り込まれ、同クーラーからの冷
媒は第２開閉弁を有する吸入管から圧ＩｌｉＩ機に吸入
され、また除霜運転時には圧縮機からの冷媒が高圧ガス
管より分岐しているホットガス管を経て前記送液管およ
びこの送液管と並列に設けた側路管の第４開閉弁を通っ
て本クーラーへ送り込まれる冷凍ｍａｔにおいて、前記
本クーラーからの吸入管における前記第２開閉弁の１次
側より掖管を分岐せしめて、この液管をプレクーラーに
接続し，しかも同液管には本クーラーの除霜Ｗ転時に開
となる第５の開閉弁と膨張弁を設け２プレクーラーの冷
媒出口は戻り管をもって前記吸入管の開閉弁の２次側へ
接続し、前配送液管からは前記プレクーラー用液管にお
ける膨張弁の２次側へ接続した側路管を設けて、この側
路管にプレクーラーの除霜運転時に開く第６の開閉弁を
設け、かつ前記送液管の一部と吸入管の一部とを互いに
平行に接触せしめて熱交換部とした構成のものとしてあ
る．
［実施例］
以下本発明の一例を添付図而に示す一具体例によって説
明する．
図において符号ｌは圧縮機で、同圧縮機からの冷媒ガス
は高圧ガス管２により凝縮器３へ送られ，ここで液化さ
れた冷媒液は送液管４の第１開閉弁ｖ１を通って膨張弁
ＥＶＩから本クーラー５の冷却コイル５ａへ吹き込まれ
る．なお，前記＠１開閉弁ｖ１は冷却運転時には開、除
霜運転時には閉じる弁である．
本クーラーのコイル５ａから出た冷媒蒸気は、冷却運転
時には開となる第２開閉弁ｖ２を有する吸入管６から圧
縮機１に吸入される．
前記高圧ガス管２からは，冷却運転時には閉じているが
、除霜運転時には開くデフロスト用第３開閉弁ｖ３有す
るホットガス管７が分岐しており，このホットガス管７
は前配送液管４に接続されている．
また、送液管には前記第１開閉弁Ｖｔと膨張弁ＥＶ，
とを跨ぐ除霜用側路管８を並列に設けてあり、この側路
管に、冷却運転時には閉じているが，除霜運転時には開
くデフロスト用の第４開閉弁ｖ４を設けてある．
前記のような装置において、木発明は，本クーラーの出
口に接続してある吸入管６における前記！ｌＳ２開閉弁
ｖ２の１次側から掖管９を分岐せしめて，同液管９を除
霜時用のプレクーラ１０のコイル！＋ｌａへ接続せしめ
、かつ液管９には冷却運転時には閉じているが，除′Ｍ
運転時には開く！８５開閉弁ｖ５と，これに続く膨張弁
ＥＶ２ を設けてあり，プレクーラーのコイル１０ａ出
口を前記吸入管６における開閉弁ｖ２の２次側へ戻り管
【ｌにて接続してある．
また，送液ｖ４における前記第１開閉弁Ｖｌの１次側か
らは、前記プレクーラーのコイル１０ａの入口側へ接続
した側路’ｌ’ｌ’ｌ２を設けて、この側路’ｌｌ’ｌ
２に除霜時に開く（シたがって冷却運転時には閉じてい
る）第６開閉弁ｖ６を設けてある．
さらに本発明においては、前記吸入管６の一部を送液ｖ
４の一部へ平行に接触せしめて熱交換部ｌ３を構成して
ある．
この熱交換部ｌ３は送液管４と吸入管６とをバンドｌ４
にて結束し、まわりを断熱材ｌ５にて覆ってある．
この実施例の装置の運転は次ぎのように行なわれる．
本クーラーの冷Ｉｖ
冷却運転時に第１．第２図の開閉弁Ｖ１、ｖ２が開いて
おり、他の開閉弁ｖ３、Ｖ４． Ｖ５， Ｖ６は閉じて
いる．
したがって１圧縮機からの冷媒は実線矢印のように凝縮
器３、開閉弁Ｖｌ．膨張弁ＥＶ＋ を経て本クーラー５
のコイル５ａに入り、本クーラーからの冷媒は開閉弁ｖ
２が開いている吸入１ｒ？６を経て圧縮機に吸入される
．
生！二二旦」Ｌ降ｎ Ｅｌ！ ｆ
この運転時には第３、第４、第５の開閉弁ｖ３、ｖ４、
ｖ５は開、第１．第２，第６の開閉弁ｖｌ，ｖ，、ｖ６
は閉じている．
したがって、圧縮機からの高温高圧のホットガスはＷＩ
Ｉ線矢印のように凝縮器３を通らずに除霜用側路管８の
デフロスト用第４の開閉弁Ｖａを経て本クーラーのコイ
ル５ａに入り、これにより同コイルの除霜を行なう．
本クーラーのコイル５ａを出た冷媒液（ホットガスが除
霜により冷却液化された冷媒）は液管９の開となってい
る第５開閉弁ｖ５を通って膨張弁ＥＶ２ からプレクー
ラー１０のコイル…へ吹き込まれ，再蒸発されてプレク
ーラーは冷却運転される．
プレクーラーのコイル１０ａを出た蒸気冷媒は戻り管１
１．吸入管６を経て圧縮機ｌに吸入されるが、吸入管６
を通る間に熱交換部ｌ３で圧縮機からのホットガスによ
り加熱され、これにより充分に気化される．
したがって，プレクーラーからの冷媒はガス化されて圧
ｍｅに吸入され、液バックすることはない．
プレクーラーの除霜 転
本クーラーの除霜が終了すると続いてプレクーラーの除
霜がなされる（木クーラーの除ｆｆｉ運転中にプレクー
ラーには霜が発生するため）
このぱあいには第３，第６の開閉弁Ｖ３， Ｖ６が開き
２他の開閉弁Ｖ，，Ｖ２、ｖ４，ｖ５は閉じている．
したがって、圧縮機からのホットガスは、２点鎖線矢印
のように第３開閉弁１ｈ． ＯＩＩ路管１２，第６開閉
弁ｖ６を経てプレクーラーのコイル１０ａへ送り込まれ
，同コイルの除霜が行なわれる．
プレクーラーからの冷媒は戻り管口、吸入管６を経て圧
縮機に吸入されるが、このぱあいにも熱交換部１３にて
圧ｌｉｔ機からのホットガスにより加熱，気化され、液
バックすることなく圧縮機に吸入される．
［効 果］
本発明によれば、本クーラーの除霜７ｌ！転時プレクー
ラーによって冷却運転が行なわれるので、本クーラーの
除’ＭＷ転時中に空調室が昇温されるのを極力防止でき
る．
本クーラー、プレクーラーの除霜時には、本クーラー、
プレクーラーから出た冷媒は熱交換部にて圧縮機からの
ホットガスにより加熱され、気化されるので、液バック
を生じるおそれはなく，圧１１機の安全運転ができる．
また、冷却運転時には凝縮器からの冷媒液が吸入管を通
る低温冷媒によって熱交換部で予冷されるので、本クー
ラーの冷却能力が向ヒさせられる．
さらに，前記熱交換部は、送液管の一部と吸入管の一部
とを平行に接触せしめ、必要に応じては接触部を断熱材
にて覆ったものであるから、構造が簡単であり，他に液
バー２ク防止用の装置を設ける必要はなく、装置のコス
ト低減を期せる．[Detailed Description of the Invention] [Industrial Application Field] The refrigeration system of the present invention is used for indoor cooling of refrigerated warehouses and other buildings. [Prior art and its drawbacks] In a refrigeration system that defrosts the cooler by supplying high-pressure, high-temperature refrigerant gas (hot gas) from a pressure wA machine to the cooler, the refrigerant gas (hot gas) defrosts the cooler while passing through the cooler. The cooled refrigerant gas condenses and a liquid back phenomenon occurs. This can cause damage to the compressor. [Object of the present invention] The purpose of the present invention is to prevent the refrigerant that has passed through the cooler during defrosting from being re-emitted and causing a liquid back phenomenon in a refrigeration system that defrosts using a hot gas. Moreover, by making the re-evaporation of the refrigerant from the cooler occur through heat exchange with the hot gas from the compressor, the structure of the re-evaporation exchange section can be simplified, and furthermore, the re-evaporation of the refrigerant from the cooler can be performed by heat exchange with the hot gas from the compressor. The purpose is to make it possible to improve the abilities of people. [Structure of the present invention] In the refrigeration system according to the present invention, during cooling operation, refrigerant from the compressor is sent to the main cooler via the high-pressure gas pipe, the condenser, the liquid feed pipe, the first on-off valve, and the expansion valve. The refrigerant from the cooler is sucked into the pressure IliI machine through a suction pipe having a second on-off valve, and during defrosting operation, the refrigerant from the compressor passes through the hot gas pipe branched from the high-pressure gas pipe to the above-mentioned liquid supply. In the refrigerated mat that is sent to the main cooler through the fourth on-off valve of the side pipe installed in parallel with the main cooler, the refrigerated mat is The pipe is branched and this liquid pipe is connected to the pre-cooler, and the liquid pipe is equipped with a fifth on-off valve and an expansion valve that open when the main cooler is turned to defrost W, and the refrigerant outlet of the second pre-cooler is connected to the pre-cooler. A return pipe is connected to the secondary side of the on-off valve of the suction pipe, and a side pipe is connected from the pre-distribution liquid pipe to the secondary side of the expansion valve in the precooler liquid pipe. A sixth on-off valve that opens during defrosting operation of the precooler is provided, and a portion of the liquid sending pipe and a portion of the suction pipe are brought into contact with each other in parallel to form a heat exchange section. [Example] An example of the present invention will be explained below using a specific example shown in the attached drawings. In the figure, the symbol l is a compressor, and the refrigerant gas from the compressor is sent to the condenser 3 through the high-pressure gas pipe 2, and the refrigerant liquid liquefied here passes through the first on-off valve v1 of the liquid sending pipe 4. It is blown into the cooling coil 5a of the main cooler 5 from the expansion valve EVI. Note that the @1 on-off valve v1 is a valve that opens during cooling operation and closes during defrosting operation. Refrigerant vapor emitted from the coil 5a of this cooler is sucked into the compressor 1 through the suction pipe 6, which has a second on-off valve v2 that is open during cooling operation. A hot gas pipe 7 having a third opening/closing valve v3 for defrosting, which is closed during cooling operation but opens during defrosting operation, branches off from the high pressure gas pipe 2.
is connected to the front delivery liquid pipe 4. In addition, the first on-off valve Vt and the expansion valve EV are provided in the liquid sending pipe.
A defrosting side pipe 8 is provided in parallel, which straddles the two, and this side pipe is provided with a fourth opening/closing valve v4 for defrosting, which is closed during cooling operation but opens during defrosting operation. In the above-mentioned device, the present invention is characterized in that the above-mentioned ! A liquid pipe 9 is branched from the primary side of the lS2 on-off valve v2, and the same liquid pipe 9 is used as a coil of a pre-cooler 10 for defrosting! +la, and the liquid pipe 9 is closed during cooling operation, but the
Open when driving! An 85 on-off valve v5 and an expansion valve EV2 following this are provided, and the outlet of the coil 10a of the precooler is connected to the secondary side of the on-off valve v2 in the suction pipe 6 through a return pipe [l]. Further, from the primary side of the first on-off valve Vl in liquid feeding v4, a side path 'l'l'l2 connected to the inlet side of the coil 10a of the pre-cooler is provided, and this side path 'll'l
2 is provided with a sixth on-off valve v6 that opens during defrosting (and therefore closes during cooling operation). Furthermore, in the present invention, a portion of the suction pipe 6 is connected to the liquid supply v
4 in parallel to form a heat exchange section l3. This heat exchange part l3 connects the liquid sending pipe 4 and the suction pipe 6 to a band l4.
They are tied together and covered with heat insulating material 15. The device of this example is operated as follows. Cooling IV of this cooler During cooling operation, the first. The on-off valves V1, V2 in FIG. 2 are open, and the other on-off valves v3, V4. V5 and V6 are closed. Therefore, the refrigerant from compressor 1 is transferred to condenser 3, on-off valve Vl. Main cooler 5 via expansion valve EV+
The refrigerant from the cooler enters the coil 5a of the on-off valve v.
Inhalation 1r with 2 open? 6 and is sucked into the compressor. Living! 22dan”L descending El! f During this operation, the third, fourth, and fifth on-off valves v3, v4,
v5 is open, 1st. Second and sixth on-off valves vl, v,, v6
is closed. Therefore, the high temperature and high pressure hot gas from the compressor is WI
As indicated by the I-line arrow, it enters the coil 5a of the main cooler through the fourth defrost on-off valve Va of the defrosting side pipe 8 without passing through the condenser 3, thereby defrosting the coil. The refrigerant liquid (refrigerant obtained by cooling and liquefying the hot gas by defrosting) exiting the coil 5a of the main cooler passes through the fifth on-off valve v5, which is opened in the liquid pipe 9, and then passes through the expansion valve EV2 to the coil of the pre-cooler 10. It is blown into ... and re-evaporated, and the precooler is operated for cooling. The vapor refrigerant that has exited the coil 10a of the precooler is returned to the return pipe 1.
1. It is sucked into the compressor l through the suction pipe 6, but
While passing through, it is heated by the hot gas from the compressor in the heat exchange section l3, and is thereby sufficiently vaporized. Therefore, the refrigerant from the precooler is gasified and sucked into the pressure me, and there is no possibility of liquid backing. Defrosting the pre-cooler After the defrosting of the main cooler is completed, the pre-cooler is subsequently defrosted (because frost occurs in the pre-cooler during the defrosting operation of the wood cooler). , the sixth on-off valves V3 and V6 are open, and the other two on-off valves V, , V2, v4 and v5 are closed. Therefore, the hot gas from the compressor is transferred to the third on-off valve 1h as indicated by the two-dot chain arrow. It is sent to the pre-cooler coil 10a through the OII pipe 12 and the sixth on-off valve v6, and the coil is defrosted. The refrigerant from the pre-cooler is sucked into the compressor through the return pipe port and the suction pipe 6, but this part is also heated and vaporized by the hot gas from the pressurized lit machine in the heat exchange section 13, and is liquid-backed. It is sucked into the compressor without any problem. [Effect] According to the present invention, the present cooler defrosts 7 liters! Since the cooling operation is carried out by the pre-cooler when the main cooler is turned off, it is possible to prevent the temperature of the air-conditioned room from rising as much as possible while the main cooler is turned off. When defrosting the main cooler or pre-cooler, the main cooler,
The refrigerant coming out of the pre-cooler is heated and vaporized by hot gas from the compressor in the heat exchange section, so there is no risk of liquid backflow and safe operation of the compressor is possible.
Additionally, during cooling operation, the refrigerant liquid from the condenser is pre-cooled in the heat exchange section by the low-temperature refrigerant passing through the suction pipe, increasing the cooling capacity of this cooler. Furthermore, the heat exchange part has a simple structure because a part of the liquid sending pipe and a part of the suction pipe are brought into contact with each other in parallel, and the contact part is covered with a heat insulating material if necessary. There is no need to install any other device to prevent liquid burns, and the cost of the device can be reduced.
第１図は本発明に係る装置の一例を示す全体図、第２図
は熱交換部の断面図である．図 中
ｌ・・圧縮機 ２・◆高圧ガス管３・●凝縮器
４・●送液管
５●●木クーラー ５ａｓ●コイル
６・・吸入管 ７・・ホットガス管８●・側路管
９・・液管
ＩＯ●●プレクーラー １０ａ ●●コイルｌ１・・
戻り管 １２・・側路管１３●・熱交換部
１４●●バンド１５●・断熱材 Ｖ１〜ｖ６・●
開閉弁ＥＶ＋ ． ＥＶ２ ●ｕ張弁Fig. 1 is an overall view showing an example of the device according to the present invention, and Fig. 2 is a sectional view of the heat exchange section. Figure Middle l...Compressor 2, ◆High pressure gas pipe 3, ●Condenser
4・●Liquid pipe 5●●Wood cooler 5as●Coil 6...Suction pipe 7...Hot gas pipe 8●・Side pipe 9...Liquid pipe IO●●Precooler 10a ●●Coil l1...
Return pipe 12... Side pipe 13● Heat exchange section
14●●Band 15●・Insulation material V1~v6・●
Open/close valve EV+. EV2 ●u Zhangben
Claims (1)
、送液管、第１開閉弁、膨張弁を経て本クーラーに送り
込まれ、同クーラーからの冷媒は第２開閉弁を有する吸
入管から圧縮機に吸入され、また除霜運転時には圧縮機
からの冷媒が高圧ガス管より分岐しているホットガス管
を経て前記送液管およびこの送液管と並列に設けた側路
管の第４開閉弁を通って本クーラーへ送り込まれる冷凍
装置において、前記本クーラーからの吸入管における前
記第２開閉弁の１次側より液管を分岐せしめて、この液
管をプレクーラーに接続し、しかも同液管には本クーラ
ーの除霜運転時に開となる第５の開閉弁と膨張弁を設け
、プレクーラーの冷媒出口は戻り管をもって前記吸入管
の開閉弁の２次側へ接続し、前記送液管からは前記プレ
クーラー用液管における膨張弁の２次側へ接続した側路
管を設けて、この側路管にプレクーラーの除霜運転時に
開く第６の開閉弁を設け、かつ前記送液管の一部と吸入
管の一部とを互いに平行に接触せしめて熱交換部を構成
してなる冷凍装置。During cooling operation, the refrigerant from the compressor is sent to the main cooler via the high-pressure gas pipe, condenser, liquid feed pipe, first on-off valve, and expansion valve, and the refrigerant from the cooler is sent through the suction pipe with the second on-off valve. The refrigerant is sucked into the compressor, and during defrosting operation, the refrigerant from the compressor passes through a hot gas pipe that branches off from the high-pressure gas pipe, and passes through the liquid sending pipe and the fourth side pipe installed in parallel with this liquid sending pipe. In the refrigeration system that is fed into the main cooler through an on-off valve, a liquid pipe is branched from the primary side of the second on-off valve in the suction pipe from the main cooler, and this liquid pipe is connected to the pre-cooler, and The liquid pipe is provided with a fifth on-off valve and an expansion valve that are opened during defrosting operation of the main cooler, and the refrigerant outlet of the pre-cooler is connected to the secondary side of the on-off valve of the suction pipe through a return pipe. A side pipe connected to the secondary side of the expansion valve in the precooler liquid pipe is provided from the liquid sending pipe, and a sixth on-off valve that opens during defrosting operation of the precooler is provided in this side pipe, and A refrigeration system in which a part of the liquid sending pipe and a part of the suction pipe are brought into contact with each other in parallel to form a heat exchange section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15378089A JPH07101136B2 (en) | 1989-06-16 | 1989-06-16 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15378089A JPH07101136B2 (en) | 1989-06-16 | 1989-06-16 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0320578A true JPH0320578A (en) | 1991-01-29 |
| JPH07101136B2 JPH07101136B2 (en) | 1995-11-01 |
Family
ID=15569979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15378089A Expired - Fee Related JPH07101136B2 (en) | 1989-06-16 | 1989-06-16 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07101136B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008070013A (en) * | 2006-09-13 | 2008-03-27 | Mitsubishi Electric Corp | Heat pump device and heat-pump water heater |
| JP2008267976A (en) * | 2007-04-20 | 2008-11-06 | Toyo Eng Works Ltd | Defrosting system for large low-temperature wind tunnel air cooler |
| JP2010181093A (en) * | 2009-02-05 | 2010-08-19 | Toyo Eng Works Ltd | Defrosting device in carbon dioxide circulation cooling system |
-
1989
- 1989-06-16 JP JP15378089A patent/JPH07101136B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008070013A (en) * | 2006-09-13 | 2008-03-27 | Mitsubishi Electric Corp | Heat pump device and heat-pump water heater |
| JP2008267976A (en) * | 2007-04-20 | 2008-11-06 | Toyo Eng Works Ltd | Defrosting system for large low-temperature wind tunnel air cooler |
| JP4523014B2 (en) * | 2007-04-20 | 2010-08-11 | 株式会社東洋製作所 | Defrost system for large low temperature wind tunnel air cooler |
| JP2010181093A (en) * | 2009-02-05 | 2010-08-19 | Toyo Eng Works Ltd | Defrosting device in carbon dioxide circulation cooling system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07101136B2 (en) | 1995-11-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |