CN201306882Y - Water-source multi-couple unit air conditioning system with low-load oil return control loop - Google Patents

Water-source multi-couple unit air conditioning system with low-load oil return control loop Download PDF

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Publication number
CN201306882Y
CN201306882Y CNU2008201750448U CN200820175044U CN201306882Y CN 201306882 Y CN201306882 Y CN 201306882Y CN U2008201750448 U CNU2008201750448 U CN U2008201750448U CN 200820175044 U CN200820175044 U CN 200820175044U CN 201306882 Y CN201306882 Y CN 201306882Y
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CN
China
Prior art keywords
oil return
control loop
return control
heat exchanger
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.)
Expired - Lifetime
Application number
CNU2008201750448U
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Chinese (zh)
Inventor
张文强
汪剑波
林文涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CNU2008201750448U priority Critical patent/CN201306882Y/en
Application granted granted Critical
Publication of CN201306882Y publication Critical patent/CN201306882Y/en
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Abstract

The utility model discloses a water-source multi-couple unit air conditioning system with a low-load oil return control loop, which comprises an air-conditioning system. The air-conditioning system further comprises an oil return control loop, wherein one end of the oil return control loop is connected between a plate-type heat exchanger and a main electronic expansion valve, the other end of the oil return control loop is communicated with a gas-liquid separator, and the oil return control loop consists of a solenoid valve and a flow-limiting capillary tube. The water-source multi-couple unit air conditioning system ensures the safety of oil return in the compressor in such a case that the required refrigerant flow amount is small.

Description

The water source multi-online air-conditioning system of band underload oil return control loop
Technical field
The utility model relates to a kind of air-conditioning equipment, specifically a kind of water source multi-online air-conditioning system.
Background technology
The water source multi-online air-conditioning system of prior art adopts the water-cooled plate type heat exchanger to be used as evaporimeter and uses when heating.In the process of heating, higher when inflow temperature, heat load less the time, required refrigerant flow is seldom.And the circulation area of plate type heat exchanger is bigger, and the cold-producing medium flow velocity is too low, is not enough to take lubricating oil to certain height, takes plate type heat exchanger out of and gets back to compressor.Therefore after long-time the use, lubricated pasta descends in the compressor crankcase, and a series of problems have appearred in compressor oil return safety etc.
Summary of the invention
Task of the present utility model is to provide a kind of water source multi-online air-conditioning system with underload oil return control loop, and it can guarantee the security of compressor operating oil return when required refrigerant flow is very little.
Its technical solution is: the water source multi-online air-conditioning system of band underload oil return control loop, comprise compressor, compressor is connected with cross valve by pipeline, cross valve is connected with the outside plate type heat exchanger, plate type heat exchanger is connected with main electric expansion valve, main electric expansion valve is connected with corresponding each indoor heat exchanger by each indoor electric expansion valve, indoor heat exchanger is connected with cross valve, cross valve is connected with gas-liquid separator, gas-liquid separator is connected with compressor, and described air-conditioning system also comprises an oil return control loop.
One end of above-mentioned oil return control loop is connected between plate type heat exchanger and the main electric expansion valve, and the other end is connected with gas-liquid separator, and the oil return control loop comprises magnetic valve and current limliting capillary.
Above-mentioned compressor adopts frequency-changeable compressor.
The beneficial effects of the utility model are: increased the oil return control loop in system, unlatching by the control magnetic valve, adjust current limliting length capillaceous and decide flow, make mixed liquid flow back to gas-liquid separator, thereby the lubricating oil in the guarantee cold-producing medium can be got back in the compressor, has prolonged the time under the long pipe arrangement operation of multi-joint machine system.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Describe below in conjunction with 1 pair of the utility model of accompanying drawing:
The specific embodiment
A kind of water source multi-online air-conditioning system described in the utility model with underload oil return control loop, comprise compressor 1, compressor 1 is connected with cross valve 2 by pipeline, cross valve 2 is connected with outside plate type heat exchanger 3, plate type heat exchanger 3 is connected with main electric expansion valve 4, main electric expansion valve 4 is connected with corresponding each indoor heat exchanger 8 by each indoor electric expansion valve 7, indoor heat exchanger 8 is connected with cross valve 2, cross valve 2 is connected with gas-liquid separator 9, gas-liquid separator 9 is connected with compressor 1, described air-conditioning system also comprises an oil return control loop, one end of oil return control loop is connected between plate type heat exchanger 3 and the main electric expansion valve 4, the other end is connected with gas-liquid separator 9, and the oil return control loop comprises magnetic valve 5 and current limliting capillary 6.
Heat under the state when unit is in operation, and at little load, during high inflow temperature, because water-cooling pattern, at this moment evaporating the degree of superheat can be very big, and compressor exhaust temperature can rise very high, and condensing pressure is very high.Can satisfy the underrun of system by reducing the aperture of main electric expansion valve this moment.But owing to gas refrigerant and lubricating oil separation in the plate type heat exchanger, the cold-producing medium flow velocity is very low, and lack of refrigerant is got back to compressor to take the lubricating oil in the plate type heat exchanger out of plate type heat exchanger.Therefore by adopting the oil return auxiliary piping, when thermic load operation less than system's peak load 50% the time, open oil return solenoid valve, lubricating oil after guiding separates is got back in the gas-liquid separator by this pipeline, pass through compressor air suction, get back to compressor, thereby reach the effect of low frequency underload lower compression machine oil return safety.When hanging down inflow temperature, load was greater than 50% o'clock, and it is big that the cold-producing medium flow velocity of outdoor heat exchanger becomes, and is enough to self and takes back lubricating oil, then closes oil return solenoid valve, recovers normal electronic expansion valve controls.
Certainly, protection domain of the present utility model is not limited to the foregoing description, so long as those of ordinary skill in the art is through creatively improving, and just should be within protection domain of the present utility model.

Claims (3)

1, the water source multi-online air-conditioning system of band underload oil return control loop, comprise compressor, compressor is connected with cross valve by pipeline, cross valve is connected with the outside plate type heat exchanger, plate type heat exchanger is connected with main electric expansion valve, main electric expansion valve is connected with corresponding each indoor heat exchanger by each indoor electric expansion valve, indoor heat exchanger is connected with cross valve, cross valve is connected with gas-liquid separator, gas-liquid separator is connected with compressor, it is characterized in that described air-conditioning system also comprises an oil return control loop.
2, the water source multi-online air-conditioning system of band underload oil return control loop according to claim 1, an end that it is characterized in that described oil return control loop is connected between plate type heat exchanger and the main electric expansion valve, the other end is connected with gas-liquid separator, and the oil return control loop comprises magnetic valve and current limliting capillary.
3, the water source multi-online air-conditioning system of band underload oil return control loop according to claim 1 is characterized in that described compressor adopts frequency-changeable compressor.
CNU2008201750448U 2008-11-12 2008-11-12 Water-source multi-couple unit air conditioning system with low-load oil return control loop Expired - Lifetime CN201306882Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008201750448U CN201306882Y (en) 2008-11-12 2008-11-12 Water-source multi-couple unit air conditioning system with low-load oil return control loop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008201750448U CN201306882Y (en) 2008-11-12 2008-11-12 Water-source multi-couple unit air conditioning system with low-load oil return control loop

Publications (1)

Publication Number Publication Date
CN201306882Y true CN201306882Y (en) 2009-09-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2008201750448U Expired - Lifetime CN201306882Y (en) 2008-11-12 2008-11-12 Water-source multi-couple unit air conditioning system with low-load oil return control loop

Country Status (1)

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CN (1) CN201306882Y (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102072531A (en) * 2010-12-29 2011-05-25 广东美的电器股份有限公司 Four-pipe heat recovery multi-split air-conditioning system
CN109489295A (en) * 2018-11-21 2019-03-19 青岛海信日立空调系统有限公司 Multi-connected air conditioning system and its control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102072531A (en) * 2010-12-29 2011-05-25 广东美的电器股份有限公司 Four-pipe heat recovery multi-split air-conditioning system
CN102072531B (en) * 2010-12-29 2012-11-07 广东美的电器股份有限公司 Four-pipe heat recovery multi-split air-conditioning system
CN109489295A (en) * 2018-11-21 2019-03-19 青岛海信日立空调系统有限公司 Multi-connected air conditioning system and its control method
CN109489295B (en) * 2018-11-21 2021-03-30 青岛海信日立空调系统有限公司 Multi-connected air conditioning system and control method thereof

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CX01 Expiry of patent term

Granted publication date: 20090909

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