CN202403456U - Multiple-compressor parallel unit comprising flooded shell-tube evaporator - Google Patents
Multiple-compressor parallel unit comprising flooded shell-tube evaporator Download PDFInfo
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- CN202403456U CN202403456U CN2011205028537U CN201120502853U CN202403456U CN 202403456 U CN202403456 U CN 202403456U CN 2011205028537 U CN2011205028537 U CN 2011205028537U CN 201120502853 U CN201120502853 U CN 201120502853U CN 202403456 U CN202403456 U CN 202403456U
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Abstract
The utility model relates to a multiple-compressor parallel unit comprising a flooded shell-tube evaporator, which belongs to multiple-compressor units and solves the problem that liquid refrigerants return to a unit along with gaseous refrigerants in the prior art. The multiple-compressor parallel unit comprises a multiple-compressor parallel unit body and the flooded shell-tube evaporator, wherein the multiple-compressor parallel unit body consists of a plurality of compressors connected in parallel, and the flooded shell-tube evaporator is connected with an expansion valve of the unit. Heat exchange tubes are arranged in an evaporator shell, liquid refrigerants exiting from the expansion valve enter the evaporator shell, are evaporated into gaseous refrigerants and return to the multiple-compressor parallel unit through a joint at an outlet end of the shell, a metal plate is arranged between the last row of heat exchange tubes and a shell outlet in the shell, and a gas-liquid refrigerant separating device is arranged between the last row of heat exchange tubes and the metal plate. As the metal plate and the mechanical gas-liquid separating device are arranged in the shell and the tubes of the flooded shell-tube evaporator, the liquid refrigerants can be prevented from returning to the multiple-compressor parallel unit, and normal running of the compressors is protected.
Description
Technical field
The utility model relates to Compressor Group, refers in particular to a kind of multi-compressor parallel connection unit that uses the full-liquid type shell-tube evaporator.
Background technology
In the unit of a plurality of compressor parallel configurations, when sub-load, (has only the part compressor), because the refrigeration oil of all compressors is all in system in operation; Refrigeration oil and total refrigerant mixed, in addition, because the refrigerant velocities in the circuit is lower; If refrigeration oil leaves compressor; Stay in the heat exchanger of the inside, influence the efficient of diabatic process, increase the risk of compressor oil starvation fault.
The correct conveying of cold-producing medium is very important in the refrigeration system, and what cold-producing medium must guarantee to continue gets back to compressor to prevent the damage of compressor.In addition, cold-producing medium gets back to must guarantee it is gaseous state before the compressor leaving heat exchanger, occurs thereby should avoid liquid refrigerant to follow the situation that gaseous refrigerant reduces steam flow rate.If cold-producing medium is got back to compressor, and system's refrigerating efficiency is when descending than normal unit efficiency, explains that then refrigerant liquid gets back to the process existing problems of compressor.For helical-lobe compressor, liquid refrigerant mixes with lubricating oil, gets back to the compressor the inside, can produce hydraulic pressure to compressor and contract.If centrifugal compressor then can have influence on the operation of quick runner, produce surge phenomenon and the too high situation of input power.
Shell-tube evaporator is that how to improve the heat exchange effect is the problem that those skilled in the art study always as more a kind of heat exchanger of use in the central air-conditioning unit.The shell-tube evaporator that adopts at present divides two kinds: dry type and full-liquid type shell-tube evaporator.The full-liquid type shell-tube evaporator is more and more adopted by each producer as a kind of high-performance heat exchanger, but when flooded evaporator uses as heat exchanger, aforesaid compressor oil return problem can occur, and this is a difficult problem need capturing in the industry.In addition, compressor can not compress liquid, so how to guarantee from the cold-producing medium that flooded evaporator comes out it is that gaseous state is an important thing.
In order to address this problem; Having at present between last heat extraction exchange of flooded evaporator is managed and exported increases a metallic plate, and fluid oil is separated with gaseous state, and it is very big that such design must design evaporimeter; Need bigger profile diameter; Must increase whole machine packet size like this, increase the charging amount of cold-producing medium, thereby produce higher cost.In addition,, then the liquid level of cold-producing medium in evaporimeter must be reduced, the heat exchange efficiency of heat exchanger can be reduced like this if liquid refrigerant can not be prevented fully.
The utility model content
The purpose of the utility model is in order to solve the problem that prior art exists, and provides a kind of use to prevent that liquid refrigerant from getting back to the multi-compressor parallel connection unit of the full-liquid type shell-tube evaporator of compressor, uses this full-liquid type shell-tube evaporator can not increase the machine packet size.
The purpose of the utility model realizes through following technical scheme:
A kind of multi-compressor parallel connection unit that uses the full-liquid type shell-tube evaporator, it comprises:
The multi-compressor parallel connection unit of forming by a plurality of compressor parallels;
The full-liquid type shell-tube evaporator is connected with the expansion valve of said multi-compressor parallel connection unit, and it comprises: housing; Stream is set in the housing has the heat-exchange tube of refrigerating medium; The liquid refrigerant of multi-compressor parallel connection unit comes out and gets in the housing through the connection mouth of pipe that places the housing inlet end to flash to gaseous refrigerant through expansion valve, and gaseous refrigerant is got back to multi-compressor parallel connection unit through the interface that places the housing port of export; In housing, the middle upper portion position between last heat extraction exchange pipe and housing outlet and in housing is provided with a metallic plate: in housing, between last heat extraction exchange pipe and metallic plate, a refrigerant air-liquid separator is set.
Said refrigerant air-liquid separator adopts mechanical cancellated gas-liquid separation device.
In the said housing, a heat exchange module is set also between gas-liquid separation device and metallic plate.
Said heat exchange module adopts number row's copper pipe or finned tube to combine.
The beneficial effect of the utility model:
The utility model uses the multi-compressor parallel connection unit of full-liquid type shell-tube evaporator; Owing in the package of shell-tube evaporator, adopt metallic plate and liquid mechanism of qi tool separator; Can guarantee that liquid refrigerant does not turn back to multi-compressor parallel connection unit; And flow velocity that can the balanced system cryogen, and having improved the heat exchange efficiency of heat exchanger, the protection unit normally moves.The distance between last heat extraction exchange pipe and the outlet designs than the weak point of prior art in this structure in addition, therefore can reduce refrigerant charge and needn't increase the size of heat exchanger.
Be above-mentioned purpose, design feature and the effect that further specifies the utility model, below will combine accompanying drawing that the utility model is elaborated.
Description of drawings
Fig. 1 uses the multi-compressor parallel connection unit structural representation of full-liquid type shell-tube evaporator for the utility model.
The specific embodiment
Be elaborated below in conjunction with the accompanying drawing of embodiment the specific embodiment to the utility model.
Referring to Fig. 1; The multi-compressor parallel connection unit of the use full-liquid type shell-tube evaporator of the utility model comprises multi-compressor parallel connection unit of being made up of a plurality of compressor parallels (present embodiment adopts three units that screw compressor composes in parallel) 10 and the full-liquid type shell-tube evaporator 20 that is connected with the expansion valve of said multi-compressor parallel connection unit 10.
Said full-liquid type shell-tube evaporator 20 comprises: housing 22; Stream is set in the housing 22 has the heat-exchange tube of refrigerating medium; The liquid refrigerant of multi-compressor parallel connection unit 10 comes out and gets into through the connection mouth of pipe 21 that places housing 22 entrance points in the housing 22 of evaporimeters to flash to gaseous refrigerant through expansion valve; Gaseous refrigerant is got back to multi-compressor parallel connection unit 10 (shown in the figure arrow) through the interface 27 that places the housing port of export; In housing 22; Between last heat extraction exchange pipe 23 and housing outlet 26, be provided with a metallic plate 28: the centre position that last heat extraction exchange pipe 23 of prior art generally is installed in the housing 22; And the middle upper portion position that last heat extraction of the utility model exchange pipe 23 is installed in the housing 22 can be reduced the distance between last heat extraction exchange pipe 23 and the housing outlet 26 like this, thereby can reduce refrigerant charge and not increase the size of evaporimeter.In addition, lower refrigerant charge has reduced the quantity of running oil, improves the performance of unit.
In the utility model; In housing 22; In between last heat extraction exchange pipe 23 and the metallic plate 28 a refrigerant air-liquid separator 24 (the cancellated gas-liquid separation device of present embodiment employing existing mechanical) is set, the flow velocity that this device can the balanced system cryogen.In addition; In housing 22; Between gas-liquid separation device 24 and metallic plate 28, a heat exchange module 25 can also be set, heat exchange module 25 employings are arranged copper pipe or finned tube or the combination of other heat exchanger tube by number and are formed, and the fluids of heat exchange module 25 inside can adopt water or cold-producing medium.This module can balances vapour flow speed, increase the degree of superheat, the variable that also can be used as refrigeration system uses, particularly the evaporimeter of unsteady flow amount is more suitable.
After adopting above-mentioned means, this evaporimeter can guarantee that liquid refrigerant does not turn back to multi-compressor parallel connection unit 10, improves the heat exchange efficiency of heat exchanger.
Compressor can be screw compressor or centrifugal compressor.Heat-exchange tube in the evaporimeter can be copper pipe, copper nickel pipe, titanium pipe or the like, and they can be light pipe, internal thread or male-pipe.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the purpose that is used for explaining the utility model; And be not with the qualification of doing the utility model; As long as in the essential scope of the utility model, in the scope to the variation of the above embodiment, claim that modification all will drop on the utility model.
Claims (4)
1. multi-compressor parallel connection unit that uses the full-liquid type shell-tube evaporator is characterized in that comprising:
The multi-compressor parallel connection unit of forming by a plurality of compressor parallels (10);
Full-liquid type shell-tube evaporator (20) is connected with the expansion valve of said multi-compressor parallel connection unit (10), and it comprises: housing (22); Stream is set in the housing (22) has the heat-exchange tube of refrigerating medium; The liquid refrigerant of multi-compressor parallel connection unit (10) comes out and gets in the housing (22) through the connection mouth of pipe (21) that places housing (22) entrance point to flash to gaseous refrigerant through expansion valve, and gaseous refrigerant is got back to multi-compressor parallel connection unit (10) through the interface (27) that places the housing port of export; In housing (22); Middle upper portion position between last heat extraction exchange pipe (23) and housing outlet (26) and in housing (22) is provided with a metallic plate (28): in housing (22), between last heat extraction exchange pipe (23) and metallic plate (28), a refrigerant air-liquid separator (24) is set.
2. the multi-compressor parallel connection unit of use full-liquid type shell-tube evaporator as claimed in claim 1 is characterized in that:
Said refrigerant air-liquid separator (24) adopts mechanical cancellated gas-liquid separation device.
3. the multi-compressor parallel connection unit of use full-liquid type shell-tube evaporator as claimed in claim 1 is characterized in that:
In the said housing, between gas-liquid separation device (24) and metallic plate (28), a heat exchange module (25) is set also.
4. the multi-compressor parallel connection unit of use full-liquid type shell-tube evaporator as claimed in claim 3 is characterized in that:
Said heat exchange module (25) adopts number row's copper pipe or finned tube to combine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205028537U CN202403456U (en) | 2011-12-06 | 2011-12-06 | Multiple-compressor parallel unit comprising flooded shell-tube evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205028537U CN202403456U (en) | 2011-12-06 | 2011-12-06 | Multiple-compressor parallel unit comprising flooded shell-tube evaporator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202403456U true CN202403456U (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205028537U Expired - Lifetime CN202403456U (en) | 2011-12-06 | 2011-12-06 | Multiple-compressor parallel unit comprising flooded shell-tube evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202403456U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435022A (en) * | 2011-12-06 | 2012-05-02 | 克莱门特捷联制冷设备(上海)有限公司 | Multi-compressor parallel unit using flooded shell-and-tube evaporator |
| CN104019585A (en) * | 2014-06-24 | 2014-09-03 | 山东雅士股份有限公司 | Flooded evaporator and flooded air conditioning unit |
-
2011
- 2011-12-06 CN CN2011205028537U patent/CN202403456U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435022A (en) * | 2011-12-06 | 2012-05-02 | 克莱门特捷联制冷设备(上海)有限公司 | Multi-compressor parallel unit using flooded shell-and-tube evaporator |
| CN104019585A (en) * | 2014-06-24 | 2014-09-03 | 山东雅士股份有限公司 | Flooded evaporator and flooded air conditioning unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120829 |