CN209763527U - Low-pressure bypass device of flash drum of air source screw cold water heat pump unit - Google Patents

Low-pressure bypass device of flash drum of air source screw cold water heat pump unit Download PDF

Info

Publication number
CN209763527U
CN209763527U CN201920141533.XU CN201920141533U CN209763527U CN 209763527 U CN209763527 U CN 209763527U CN 201920141533 U CN201920141533 U CN 201920141533U CN 209763527 U CN209763527 U CN 209763527U
Authority
CN
China
Prior art keywords
pressure
low
air
compressor
screw 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.)
Active
Application number
CN201920141533.XU
Other languages
Chinese (zh)
Inventor
王栋明
沈伟钢
蒋伟
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.)
Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Zhejiang Electromechanical Design and Research Institute Co Ltd
Original Assignee
Zhejiang Electromechanical Design and Research Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Electromechanical Design and Research Institute Co Ltd filed Critical Zhejiang Electromechanical Design and Research Institute Co Ltd
Priority to CN201920141533.XU priority Critical patent/CN209763527U/en
Application granted granted Critical
Publication of CN209763527U publication Critical patent/CN209763527U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model provides an air source screw rod cold water heat pump set flash drum low pressure bypass device, its characterized in that: the screw compressor upper end is connected in condenser and economic ware respectively, the condenser is connected with the economic ware, the screw compressor lower extreme is connected with vapour and liquid separator, vapour and liquid separator is connected with the evaporimeter upper end, the evaporimeter lower extreme is connected with the economic ware. Compared with the prior art, the utility model relates to a low-pressure bypass device of a flash drum of an air source screw cold water heat pump unit, which utilizes flash steam of a flash type economizer to supplement air at the critical point of ending air suction and starting compression of a compressor; when the suction pressure of the compressor is too low, the low-pressure lifting electromagnetic valve is opened to recover the low-pressure lifting electromagnetic valve to the allowable range of the compressor; when the exhaust pressure of the compressor is too high, the manual expansion valve is opened, and a part of high-temperature and high-pressure gas is bypassed to the evaporator, so that the exhaust pressure of the compressor is reduced.

Description

Low-pressure bypass device of flash drum of air source screw cold water heat pump unit
[ technical field ] A method for producing a semiconductor device
The utility model relates to a refrigeration air conditioning equipment field, concretely relates to air source screw rod cold water heat pump set flash drum low pressure bypass device.
[ background of the invention ]
The air source screw rod cold water heat pump unit does not occupy a machine room, can be placed in spaces such as a roof, does not need a cooling tower, does not have a cooling water system, is simple in system, can meet the requirements of refrigeration and heating simultaneously, can also meet the requirements of hot water, and is widely applied to the civil and commercial fields. The existing air source screw cold water heat pump unit mainly has the following problems: 1. when the heat pump works in a low-temperature environment, the evaporation pressure is low, so that the compression ratio of the machine is easily increased in order to maintain the water supply temperature and the condensation temperature at certain values, the throttling loss of circulation is increased, the compression efficiency is rapidly reduced, and finally the refrigeration coefficient is low. 2. The insufficient filling amount of the refrigerant causes the over-low suction pressure of the compressor and the poor refrigeration effect. 3. The motor of the compressor is cooled by the sucked refrigerant, the refrigerant circulation quantity of the system is reduced under a high pressure ratio, the motor cannot be cooled well, and the exhaust pressure is overhigh. 4. The screw compressor with the economizer can greatly improve refrigerating capacity and refrigerating coefficient, the lower the evaporation temperature is, the higher the condensation temperature is, and the more obvious the effect is, but the plate heat exchanger is generally adopted by the existing economizer, and the heat exchange efficiency is poor.
[ Utility model ] content
An object of the utility model is to overcome above-mentioned prior art not enough, provide an air source screw rod cold water heat pump set flash drum low pressure bypass device, it aims at solving prior art cavity air source screw rod cold water heat pump set technical problem such as complicated, with high costs, effect are not good of structure.
in order to achieve the purpose, the utility model provides an air source screw rod cold water heat pump set flash drum low pressure bypass device, its characterized in that: the system comprises a screw compressor, a condenser, a flash tank liquid supply electromagnetic valve, an economizer, a throttle valve, an evaporator, a gas-liquid separator, a low-pressure lifting electromagnetic valve and a manual expansion valve, wherein the upper end of the screw compressor is connected with the condenser and the economizer respectively, the condenser is connected with the economizer, the flash tank liquid supply electromagnetic valve is arranged between the condenser and the economizer, the lower end of the screw compressor is connected with the gas-liquid separator, the gas-liquid separator is connected with the upper end of the evaporator, the lower end of the evaporator is connected with the economizer, and the throttle valve is arranged between the evaporator and the economizer.
Preferably, the upper end of the screw compressor is provided with an air supplementing port and an air exhaust port, the lower end of the screw compressor is provided with an air suction port, the air suction port is connected with the evaporator, one path of the air supplementing port is connected with the air suction port of the screw compressor through a low-pressure lifting electromagnetic valve, the other path of the air supplementing port is connected with the flash tank economizer, one path of the air exhaust port is connected with the condenser, and the other path of the air exhaust port is connected with the evaporator through.
Preferably, the first path of the air supplementing port is provided with a first differential pressure sensor for detecting the pressure of an air suction port of the screw compressor, and the second path of the air exhaust port is provided with a second differential pressure sensor for detecting the pressure of an air exhaust port of the screw compressor.
Preferably, the first differential pressure sensor is connected to the low pressure lift solenoid valve by an electrical signal, and the second differential pressure sensor is connected to the manual expansion valve.
The utility model has the advantages that: compared with the prior art, the utility model relates to a low-pressure bypass device of a flash drum of an air source screw cold water heat pump unit, which utilizes the characteristic that the processes of air suction, compression and exhaust of a screw compressor are in different spatial positions, and utilizes flash steam of a flash type economizer to supplement air at the critical point of air suction ending and compression starting of the compressor; meanwhile, when the suction pressure of the compressor is too low, the low-pressure lifting electromagnetic valve is opened, and the medium-pressure and medium-temperature gaseous refrigerants of the drainage part are drained to a suction inlet of the compressor from a medium-pressure gas supplementing opening of the compressor, so that the suction pressure is lifted and restored to be within the allowable range of the compressor; when the exhaust pressure of the compressor is too high, the manual expansion valve is opened, and a part of high-temperature and high-pressure gas is bypassed to the evaporator, so that the exhaust pressure of the compressor is reduced. The energy efficiency ratio of the flash type economizer is higher than that of a plate type economizer, and the heat exchange efficiency is good.
The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic structural view of a flash drum low-pressure bypass device of an air source screw cold water heat pump unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a screw compressor according to an embodiment of the present invention.
In the figure: 1-screw compressor, 11-air suction port, 12-air supplement port, 13-air exhaust port, 14-first differential pressure sensor, 15-second differential pressure sensor, 2-condenser, 3-flash tank liquid supply electromagnetic valve, 4-economizer, 5-throttle valve, 6-evaporator, 7-gas-liquid separator, 8-low pressure lifting electromagnetic valve and 9-manual expansion valve.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail through the accompanying drawings and embodiments. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1 and 2, an embodiment of the utility model provides an air source screw cold water heat pump set flash drum low pressure bypass device, its characterized in that: including screw compressor 1, condenser 2, flash tank confession liquid solenoid valve 3, economic ware 4, choke valve 5, evaporimeter 6, vapour and liquid separator 7, low pressure lift solenoid valve 8, manual expansion valve 9, 1 upper end of screw compressor is connected in condenser 2 and economic ware 4 respectively, condenser 2 and economic ware 4 are connected, be equipped with the flash tank between condenser 2 and the economic ware 4 and supply liquid solenoid valve 3, 1 lower extreme of screw compressor is connected with vapour and liquid separator 7, vapour and liquid separator 7 is connected with 6 upper ends of evaporimeter, 6 lower extremes of evaporimeter are connected with economic ware 4, be equipped with choke valve 5 between evaporimeter 6 and the economic ware 4.
The upper end of the screw compressor 1 is provided with an air supplementing port 12 and an exhaust port 13, the lower end of the screw compressor 1 is provided with an air suction port 11, the air suction port 11 is connected with the evaporator 6, one path of the air supplementing port 12 is connected with the air suction port 11 of the screw compressor 1 through a low-pressure lifting electromagnetic valve 8, and the other path of the air supplementing port is connected with the flash tank economizer 4. One path of the exhaust port 13 is connected with the condenser 2, and the other path is connected with the evaporator 6 through the manual expansion valve 9.
The first path of the air supplementing port 12 is provided with a first differential pressure sensor 14 for detecting the pressure of the air suction port 11 of the screw compressor 1. The second path of the exhaust port 13 is provided with a second differential pressure sensor 15 for detecting the pressure of the exhaust port 13 of the screw compressor 1. The first differential pressure sensor 14 is connected with the low-pressure lifting solenoid valve 8 through an electric signal, and the second differential pressure sensor 15 is connected with the manual expansion valve 9.
The utility model discloses the working process:
The utility model relates to an air source screw rod cold water heat pump set flash drum low pressure bypass device is in the course of the work, high temperature high pressure gas is discharged by screw compressor 1's gas vent 13, after refrigerant steam gets into condenser 2 and condenses into liquid, the liquid of discharging from condenser 2 export divide into two the tunnel, connect economic ware 4 all the way, the supercooling in economic ware 4's coil pipe, then through throttle valve 5 throttle step-down entering evaporimeter 6, evaporate refrigeration in evaporimeter 6, the steam that produces is inhaled by screw compressor 1's sunction inlet 11; and the other path of the refrigerant is throttled to intermediate pressure by a liquid supply electromagnetic valve 3 of the flash tank, enters the economizer 4, is evaporated in the economizer, enables high-pressure refrigerant in a coil pipe of the economizer 4 to be supercooled, and steam generated by evaporation enters an air supplement port 12 of the screw compressor 1, is continuously compressed and is discharged from an air exhaust port 13 of the screw compressor 1. When the suction pressure of the screw compressor 1 is too low, the low-pressure lifting electromagnetic valve 8 is opened, and partial medium-temperature and medium-pressure gaseous refrigerant is guided to the suction port 11 of the screw compressor 1 from the air supplement port 12 of the screw compressor 1 to lift the suction pressure so as to recover the suction pressure to the allowable range of the compressor. When the exhaust pressure of the screw compressor 1 is too high, the manual expansion valve 9 is opened, a part of high-temperature and high-pressure refrigerant is bypassed, the refrigerant enters the inlet of the evaporator 6 after being throttled and depressurized, the exhaust pressure of the compressor is reduced, and R1234yf environment-friendly refrigerant is selected as the refrigerant, wherein the GWP is 4, and the ODP is 0, so that the screw compressor has obvious environmental advantages.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (4)

1. The utility model provides an air source screw rod cold water heat pump set flash drum low pressure bypass device which characterized in that: the device comprises a screw compressor (1), a condenser (2), a flash tank liquid supply electromagnetic valve (3), an economizer (4), a throttle valve (5), an evaporator (6), a gas-liquid separator (7), a low-pressure lifting electromagnetic valve (8) and a manual expansion valve (9), wherein the upper end of the screw compressor (1) is connected with the condenser (2) and the economizer (4) respectively, the condenser (2) is connected with the economizer (4), the flash tank liquid supply electromagnetic valve (3) is arranged between the condenser (2) and the economizer (4), the lower end of the screw compressor (1) is connected with the gas-liquid separator (7), the gas-liquid separator (7) is connected with the upper end of the evaporator (6), the lower end of the evaporator (6) is connected with the economizer (4), and the throttle valve (5) is arranged between the evaporator (6) and the economizer (4).
2. The low-pressure bypass device of the flash drum of the air source screw cold water heat pump unit according to claim 1, characterized in that: the utility model discloses a flash tank, including screw compressor (1), air inlet (11), evaporimeter (6), air inlet (12), low pressure lift solenoid valve (8) are connected on one way, screw compressor (1) upper end is equipped with air supplement port (12) and gas vent (13), screw compressor (1) lower extreme is equipped with air inlet (11), air inlet (11) are connected with evaporimeter (6), air supplement port (12) are crossed low pressure and are promoted air inlet (11) that solenoid valve (8) connected screw compressor (1), and flash tank economic ware (4) are connected on another way, condenser (2) are connected all the way in gas vent (13.
3. The low-pressure bypass device of the flash drum of the air source screw cold water heat pump unit according to claim 2, characterized in that: the first path of the air supplementing port (12) is provided with a first differential pressure sensor (14) for detecting the pressure of an air suction port (11) of the screw compressor (1), and the second path of the air exhaust port (13) is provided with a second differential pressure sensor (15) for detecting the pressure of the air exhaust port (13) of the screw compressor (1).
4. The low-pressure bypass device of the flash drum of the air source screw cold water heat pump unit according to claim 3, characterized in that: the first differential pressure sensor (14) is connected with the low-pressure lifting electromagnetic valve (8) through an electric signal, and the second differential pressure sensor (15) is connected with the manual expansion valve (9).
CN201920141533.XU 2019-01-28 2019-01-28 Low-pressure bypass device of flash drum of air source screw cold water heat pump unit Active CN209763527U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920141533.XU CN209763527U (en) 2019-01-28 2019-01-28 Low-pressure bypass device of flash drum of air source screw cold water heat pump unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920141533.XU CN209763527U (en) 2019-01-28 2019-01-28 Low-pressure bypass device of flash drum of air source screw cold water heat pump unit

Publications (1)

Publication Number Publication Date
CN209763527U true CN209763527U (en) 2019-12-10

Family

ID=68750467

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920141533.XU Active CN209763527U (en) 2019-01-28 2019-01-28 Low-pressure bypass device of flash drum of air source screw cold water heat pump unit

Country Status (1)

Country Link
CN (1) CN209763527U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112066582A (en) * 2020-08-13 2020-12-11 珠海格力电器股份有限公司 Direct evaporation type magnetic suspension system and air conditioner with same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112066582A (en) * 2020-08-13 2020-12-11 珠海格力电器股份有限公司 Direct evaporation type magnetic suspension system and air conditioner with same

Similar Documents

Publication Publication Date Title
CN205939467U (en) Multi -split air conditioning system
CN103776189B (en) Tonifying Qi for the band injector of heat pump assembly increases enthalpy type heat pump circulating system
CN201293488Y (en) Frosting free air source heat pump
CN201053785Y (en) Heat pump air conditioner
CN209763527U (en) Low-pressure bypass device of flash drum of air source screw cold water heat pump unit
CN105157265A (en) Vapor compression type refrigerating cycle system provided with regenerator used for freezer and refrigerator
CN204987528U (en) Take vapour compression formula refrigeration cycle device of regenerator
CN202521763U (en) Heat pump air conditioner with dehumidification function
CN103615836A (en) Screw type total heat recovery air cooled heat pump air conditioning unit
CN109059335A (en) A kind of low-temperature air source heat pump unit
CN203595316U (en) Screw rod type total heat recovery air-cooled heat pump air conditioning unit
CN201615644U (en) Air-conditioner coolant circulating unit
CN209371555U (en) Ultra low temperature overlapping heat pump unit
CN111550944A (en) Triple throttling enthalpy-increasing double-condensation refrigerating system, air conditioner and control method
CN111550943A (en) Secondary throttling double-condensation refrigerating system, air conditioner and control method
CN206160578U (en) Refrigerant cycle system and refrigeration plant
CN205481894U (en) Heat pump set
CN201926065U (en) High-efficiency water-cooled multi-connected unit
CN201757537U (en) Liquid-feeding circulation cold/hot water unit of evaporative condensate pump
CN101576297B (en) Big supercooling degree completely fresh air air processing machine set
CN204301360U (en) A kind of can the heat reclamation type source pump of separate refrigeration
CN204494922U (en) A kind of evaporative condenser flooded screw handpiece Water Chilling Units
CN214581547U (en) Energy-saving air conditioning device for industrial factory building
CN106766405A (en) Refrigeration system supercooling apparatus
CN215260632U (en) Ultralow temperature heat pump cooling and heating unit with supercooling evaporator bottom

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant