CN107990583B - Four-way valve, refrigerating system and control method of refrigerating system - Google Patents

Four-way valve, refrigerating system and control method of refrigerating system Download PDF

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Publication number
CN107990583B
CN107990583B CN201711168542.XA CN201711168542A CN107990583B CN 107990583 B CN107990583 B CN 107990583B CN 201711168542 A CN201711168542 A CN 201711168542A CN 107990583 B CN107990583 B CN 107990583B
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China
Prior art keywords
way valve
valve
main
control
flow path
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CN201711168542.XA
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Chinese (zh)
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CN107990583A (en
Inventor
程琦
姚亮
姜佳辉
黄凯亮
刘思源
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201711168542.XA priority Critical patent/CN107990583B/en
Publication of CN107990583A publication Critical patent/CN107990583A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

The application provides a four-way valve, a refrigerating system and a control method of the refrigerating system. The four-way valve comprises a main four-way valve and a pilot four-way valve, wherein the pilot four-way valve is connected with the main four-way valve and used for controlling the flow path direction in the main four-way valve. The main four-way valve comprises an input liquid port and three reversing liquid ports. The four-way valve further includes a flow path control valve. The flow path control valve is arranged on a control liquid path of the input liquid port of the main four-way valve, which is connected with the pilot four-way valve, and is used for controlling the opening and closing of the control liquid path so as to control the quantity of the refrigerant entering the control cavity of the main four-way valve through the pilot four-way valve. By applying the technical scheme of the application, the influence of the accumulated liquid in the control cavity on the reversing of the main four-way valve can be avoided, so that the reversing of the four-way valve is smoother, the normal operation of the unit is ensured, and the reversing noise is reduced.

Description

Four-way valve, refrigerating system and control method of refrigerating system
Technical Field
The application relates to the technical field of refrigeration systems, in particular to a four-way valve, a refrigeration system and a control method of the refrigeration system.
Background
The four-way reversing valve is a flow path of a refrigerant in a switching system on the refrigerating device to change the functions of two air conditioners and realize the switching of refrigerating, heating and defrosting functions. It is a key control valve in the heat pump unit.
For large-scale air-cooled heat pump unit, use the large-scale cold quantity cross valve, adopt the cross valve, drive main cross valve switching-over through the guide cross valve, main cross valve is traded the back, has a high-pressure hollow in main cross valve inside, because the cross valve is installed outdoors, when ambient temperature is lower, the refrigerant in the high-pressure hollow can condense into liquid gradually. When reversing is performed again, the four-way valve is long in reversing time or is damaged by crushing inside due to incompressible liquid, so that the four-way valve cannot be used normally.
In addition, because the high pressure and the low pressure in the reversing process are the same, when the high pressure and the low pressure have no pressure difference at the moment, the four-way valve cannot continuously reverse, so that the problem of high pressure and low pressure air leakage occurs, and the unit cannot normally operate. In addition, the four-way valve reversing process is a process of adjusting the air flow direction, the air flow is loud during reversing, and the noise of the whole machine is increased due to overlong reversing time.
Disclosure of Invention
The embodiment of the application provides a four-way valve, a refrigerating system and a control method of the refrigerating system, which are used for solving the technical problem of difficult reversing caused by accumulated liquid in the four-way valve in the prior art.
The embodiment of the application provides a four-way valve, which comprises: the main four-way valve comprises an input liquid port and three reversing liquid ports; the pilot four-way valve is connected with the main four-way valve and used for controlling the main four-way valve, the flow path control valve is arranged on a control liquid path of which the input liquid port of the main four-way valve is connected with the pilot four-way valve and used for controlling the opening and closing of the control liquid path so as to control the quantity of refrigerant entering a control cavity of the main four-way valve through the pilot four-way valve.
In one embodiment, the flow path control valve is an electronically controlled on-off valve.
In one embodiment, the flow path control valve is a mechanical on-off valve.
In one embodiment, the four-way valve further comprises a detector for detecting whether the main four-way valve completes the reversing action, and the flow path control valve controls the control liquid path to be closed after the detector detects that the main four-way valve completes the reversing action.
In one embodiment, the four-way valve further comprises a pilot solenoid valve connected to the pilot four-way valve, the pilot solenoid valve for controlling the flow path direction in the pilot four-way valve.
The embodiment of the application also provides a refrigeration system, which comprises: a condenser; the evaporator is connected with the condenser;
the compressor is respectively connected with the condenser and the evaporator through four-way valves; the four-way valve is the four-way valve.
In one embodiment, the four-way valve further comprises: the detector is used for detecting whether the main four-way valve finishes reversing action, and the flow path control valve controls the control liquid path to be closed after the detector detects that the main four-way valve finishes reversing action; and the pilot electromagnetic valve is connected with the pilot four-way valve and is used for controlling the flow path direction in the pilot four-way valve.
The embodiment of the application also provides a control method of the refrigeration system, which is used for controlling the refrigeration system, the refrigeration system comprises a refrigeration starting state, and the control method of the refrigeration system comprises the following steps: the control liquid path is controlled to be opened by the control flow path control valve when the compressor is started; detecting whether a first pressure difference between the pressure at the outlet of the condenser and the pressure at the inlet of the compressor is lower than a first preset value or not through a detector, if the first pressure difference is lower than the first preset value, judging that the main four-way valve finishes reversing action, and controlling a control liquid path to be closed through a flow path control valve; and controlling the pilot electromagnetic valve to be closed.
In one embodiment, the refrigeration system further includes entering a defrost state, the control method of the refrigeration system including: firstly, controlling a flow path control valve to be opened; detecting whether a second pressure difference between the pressure at the outlet of the condenser and the pressure at the inlet of the compressor is lower than a second preset value or not through a detector, if the second pressure difference is lower than the second preset value, judging that the main four-way valve finishes reversing action, and controlling a control liquid path to be closed through a flow path control valve; the pilot electromagnetic valve is controlled to be kept in an open state.
In one embodiment, the refrigeration system further includes exiting the defrost state, the control method of the refrigeration system including: firstly, controlling a flow path control valve to be opened; detecting whether a third pressure difference between the pressure at the outlet of the condenser and the pressure at the inlet of the compressor is higher than a third preset value or not through a detector, if the third pressure difference is higher than the third preset value, judging that the main four-way valve finishes reversing action, and controlling a control liquid path to be closed through a flow path control valve; and controlling the pilot electromagnetic valve to be closed.
In one embodiment, the refrigeration system further includes a heating start state, and the control method of the refrigeration system includes: the control liquid path is controlled to be opened by the control flow path control valve when the compressor is started; detecting whether a fourth pressure difference between the pressure at the outlet of the condenser and the pressure at the inlet of the compressor is higher than a fourth preset value or not through a detector, if the fourth pressure difference is higher than the fourth preset value, judging that the main four-way valve finishes reversing action, and controlling a control liquid path to be closed through a flow path control valve; the pilot solenoid valve is controlled to remain open.
In the above embodiment, when the main four-way valve finishes reversing, the flow path control valve closes the control liquid path, so as to reduce the amount of refrigerant entering the control cavity of the main four-way valve from the input liquid port of the main four-way valve via the pilot four-way valve, and further reduce the accumulated liquid in the control cavity of the main four-way valve. Therefore, the influence of the accumulated liquid in the control cavity on the reversing of the main four-way valve can be avoided, so that the reversing of the four-way valve is smoother, the normal operation of the unit is ensured, and the reversing noise is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of an embodiment of a four-way valve according to the present application;
FIG. 2 is a schematic diagram of a refrigeration system according to an embodiment of the present application in one state;
fig. 3 is a schematic diagram of a construction of another state of the embodiment of the refrigeration system of fig. 2.
Wherein the above figures include the following reference numerals:
10. a main four-way valve; 11. controlling the cavity; 20. a pilot four-way valve; 30. a flow path control valve; 40. a pilot electromagnetic valve; 50. a condenser; 60. an evaporator; 70. a compressor.
Detailed Description
The present application will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. The exemplary embodiments of the present application and the descriptions thereof are used herein to explain the present application, but are not intended to limit the application.
As shown in fig. 1, the four-way valve includes a main four-way valve 10 and a pilot four-way valve 20, and the pilot four-way valve 20 is connected to the main four-way valve 10 for controlling a flow path direction in the main four-way valve 10. The main four-way valve 10 comprises an input liquid port and three reversing liquid ports, namely, a D port in the figure is the input liquid port, and a C port, an S port and an E port are the three reversing liquid ports. As shown in fig. 2, the port D and the port C may be switched to communicate with each other and the port S and the port E may be switched to communicate with each other by the pilot four-way valve 20, and as shown in fig. 3, the port D and the port E may be switched to communicate with each other and the port C and the port S may be switched to communicate with each other by the pilot four-way valve 20. In the switching process, the control liquid path of the main four-way valve 10 connected with the pilot four-way valve 20 can transfer the refrigerant of the main input liquid port into the control cavity 11 of the main four-way valve 10, and the control cavity 11 can generate effusion, thereby affecting the reversing of the main four-way valve 10.
In the technical scheme of the application, the problems are solved. As shown in fig. 1, the four-way valve includes a main four-way valve 10 and a pilot four-way valve 20, and the pilot four-way valve 20 is connected to the main four-way valve 10 for controlling a flow path direction in the main four-way valve 10. The main four-way valve 10 comprises an input fluid port and three reversing fluid ports. The four-way valve further includes a flow path control valve 30. The flow path control valve 30 is disposed on a control liquid path in which an input liquid port of the main four-way valve 10 is connected to the pilot four-way valve 20, and the flow path control valve 30 is used for controlling the opening and closing of the control liquid path to control the amount of refrigerant entering the control cavity 11 of the main four-way valve 10 through the pilot four-way valve 20.
By applying the technical scheme of the application, when the main four-way valve 10 finishes reversing, namely, the flow path control valve 30 is used for closing the control liquid path, so that the amount of refrigerant entering the control cavity 11 of the main four-way valve 10 from the liquid inlet of the main four-way valve 10 through the pilot four-way valve 20 is reduced, and the accumulated liquid in the control cavity 11 of the main four-way valve 10 is further reduced. In this way, the influence of the accumulated liquid in the control cavity 11 on the reversing of the main four-way valve 10 can be avoided, so that the reversing of the four-way valve is smoother, the normal operation of the unit is ensured, and the reversing noise is reduced.
As an alternative implementation manner, in the technical solution of this embodiment, the flow path control valve 30 is an electronically controlled on-off valve, so that the control is more convenient. Preferably, the electrically controlled on-off valve is an electromagnetic valve.
As another alternative embodiment, the flow path control valve 30 may be a mechanical on-off valve.
As a preferred embodiment, in order to enable the flow path control valve 30 to close the control fluid path in time after the main four-way valve 10 finishes the switching, the amount of refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced as much as possible. The four-way valve further comprises a detector, the detector is used for detecting whether the main four-way valve 10 finishes reversing action, and the flow path control valve 30 controls the liquid path to be closed after the detector detects that the main four-way valve 10 finishes reversing action. When the detector detects that the main four-way valve 10 finishes reversing, the flow path control valve 30 controls the control liquid path to be closed.
As shown in fig. 1, in the technical solution of the present embodiment, the four-way valve further includes a pilot electromagnetic valve 40, the pilot electromagnetic valve 40 is connected to the pilot four-way valve 20, and the pilot electromagnetic valve 40 is used for controlling the flow path direction in the pilot four-way valve 20. In use, the pilot four-way valve 20 is controlled to reverse by controlling the pilot solenoid valve 40, and the main four-way valve 10 is controlled to reverse by the pilot four-way valve 20.
As shown in fig. 2 and 3, the present application also provides a refrigeration system including a condenser 50 and an evaporator 60, the evaporator 60 being connected to the condenser 50. The compressor 70 is connected to the condenser 50 and the evaporator 60 through four-way valves, which are the four-way valves described above, respectively. When the main four-way valve 10 finishes reversing, the control liquid path is closed through the flow path control valve 30, so that the amount of refrigerant entering the control cavity 11 of the main four-way valve 10 from the liquid inlet of the main four-way valve 10 through the pilot four-way valve 20 is reduced, and the accumulated liquid in the control cavity 11 of the main four-way valve 10 is further reduced. In this way, the influence of the accumulated liquid in the control cavity 11 on the reversing of the main four-way valve 10 can be avoided, so that the reversing of the four-way valve is smoother, the normal operation of the refrigerating system is ensured, and the use noise of the refrigerating system is reduced.
In a preferred embodiment, in the above-described refrigeration system, the four-way valve further includes a detector and a pilot solenoid valve 40. The detector detects whether the main four-way valve 10 completes the reversing operation, and the flow path control valve 30 controls the closing of the control liquid path after the detector detects that the main four-way valve 10 completes the reversing operation. A pilot solenoid valve 40 is connected to the pilot four-way valve 20, and the pilot solenoid valve 40 is used to control the flow path direction in the pilot four-way valve 20. When the detector detects that the main four-way valve 10 finishes reversing, the flow path control valve 30 controls the control liquid path, so that the amount of refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced as much as possible.
As other alternative embodiments, the condition for judging whether the main four-way valve is successfully commutated can also be judged by the temperature difference value of the air pipe and the air suction port of the evaporator.
The application also provides a control method for controlling the refrigerating system, the refrigerating system comprises a refrigerating starting state, and the control method for the refrigerating system comprises the following steps:
control flow path control valve 30 opens the control liquid path at the same time when compressor 70 is started;
detecting whether a first pressure difference between the pressure at the outlet of the condenser 50 and the pressure at the inlet of the compressor 70 is lower than a first predetermined value by a detector, if the first pressure difference is lower than the first predetermined value, judging that the main four-way valve 10 finishes the reversing action, and controlling the closing of the control liquid path by the flow path control valve 30;
the pilot solenoid valve 40 is controlled to close.
Therefore, when the main four-way valve 10 controls the refrigerating system to enter a refrigerating starting state, the control liquid path can be closed timely, and the amount of the refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced. Optionally, when the detector detects that the first pressure difference is less than or equal to 50kpa, it is determined that the main four-way valve 10 completes the reversing operation.
Optionally, the refrigeration system further includes entering a defrosting state, and the control method of the refrigeration system includes:
the flow path control valve 30 is controlled to be opened;
detecting whether a second pressure difference between the pressure at the outlet of the condenser 50 and the pressure at the inlet of the compressor 70 is lower than a second predetermined value by a detector, if the second pressure difference is lower than the second predetermined value, judging that the main four-way valve 10 finishes the reversing action, and controlling the closing of the control liquid path by the flow path control valve 30;
the pilot solenoid valve 40 is controlled to be kept in an open state.
Therefore, when the main four-way valve 10 controls the refrigerating system to enter a defrosting state, the control liquid path can be closed timely, and the amount of the refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced. Optionally, when the detector detects that the second pressure difference is less than or equal to 50kpa, it is determined that the main four-way valve 10 completes the reversing operation.
Optionally, the refrigeration system further includes exiting the defrosting state, and the control method of the refrigeration system includes:
the flow path control valve 30 is controlled to be opened;
detecting whether a third pressure difference between the pressure at the outlet of the condenser 50 and the pressure at the inlet of the compressor 70 is higher than a third predetermined value by a detector, if the third pressure difference is higher than the third predetermined value, judging that the main four-way valve 10 finishes the reversing action, and controlling the closing of the control liquid path by the flow path control valve 30;
the pilot solenoid valve 40 is controlled to close.
Therefore, when the main four-way valve 10 controls the refrigerating system to exit the defrosting state, the control liquid path can be closed in time, and the amount of the refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced. Optionally, when the detector detects that the third pressure difference is greater than 50kpa, it is determined that the main four-way valve 10 completes the reversing operation.
Optionally, the refrigeration system further includes a heating start state, and the control method of the refrigeration system includes:
control flow path control valve 30 opens the control liquid path at the same time when compressor 70 is started;
detecting whether a fourth pressure difference between the pressure at the outlet of the condenser 50 and the pressure at the inlet of the compressor 70 is higher than a fourth predetermined value by a detector, and if the fourth pressure difference is higher than the fourth predetermined value, judging that the main four-way valve 10 finishes the reversing action, and controlling the closing of the control liquid path by the flow path control valve 30;
the pilot solenoid valve 40 is controlled to remain open.
Therefore, when the main four-way valve 10 controls the refrigerating system to enter a heating starting state, the control liquid path can be closed timely, and the amount of the refrigerant entering the control cavity 11 of the main four-way valve 10 is reduced. Optionally, when the detector detects that the fourth pressure difference is greater than 50kpa, it is determined that the main four-way valve 10 completes the reversing operation.
In general, the reversing condition of the main four-way valve 10 for heating start is that the pressure difference between the high pressure and the pressure is more than 300kpa.
It should be noted that, the structure of the pilot four-way valve 20 is similar to that of the main four-way valve 10, and also includes an input liquid port and three reversing liquid ports, namely, a D port, a C port, an S port and an E port, where the D port is the input liquid port, and the C port, the S port and the E port are the three reversing liquid ports.
Specifically, when the refrigeration system enters a refrigeration mode and a defrosting mode, the four-way valve and the refrigeration system act as follows: the pilot solenoid valve 40 is de-energized and the flow control valve 30 is energized. At this time, the D port and the C port of the pilot four-way valve 20 are communicated, and the E port and the S port of the pilot four-way valve 20 are communicated. Since the flow path control valve 30 is opened, the high-pressure gas from the D port of the main four-way valve 10 passes through the D port to the C port of the pilot four-way valve 20 and pushes the piston of the main four-way valve 10 to move rightward, thereby realizing the connection of the D port and the C port and the connection of the E port and the S port of the main four-way valve 10.
When the detector detects that the first pressure difference or the second pressure difference is less than or equal to 50kpa, the four-way valve is judged to be successfully commutated, and then the flow path control valve 30 is powered off. That is, the control cavity 11 on the right side of the main four-way valve 10 forms a closed space, so that the refrigerant in the control cavity 11 does not form condensate to obstruct the reversing of the main four-way valve 10.
Specifically, when the refrigeration system enters a heating mode and exits a defrosting mode, the four-way valve and the refrigeration system are as follows:
the pilot solenoid valve 40 is energized and the flow control valve 30 is energized. At this time, the D port and the E port of the pilot four-way valve 20 are communicated, and the C port and the S port of the pilot four-way valve 20 are communicated. Since the flow path control valve 30 is opened, the high pressure gas from the D port of the main four-way valve 10 is connected to the E port through the D port of the pilot four-way valve 20, and then pushes the piston of the main four-way valve 10 to move leftwards, thereby realizing the connection of the D port and the E port of the main four-way valve 10 and the connection of the C port and the S port.
When the detector detects that the third pressure difference or the fourth pressure difference is more than 50kpa, it is judged that the main four-way valve 10 is successfully commutated, and thereafter the flow path control valve 30 is powered off. That is, the control cavity 11 at the left side of the main four-way valve 10 forms a closed space, so that the refrigerant in the control cavity 11 does not form condensate to obstruct the reversing of the main four-way valve 10.
In the technical scheme of the application, the main four-way valve in the refrigerating system can be a PE four-way valve or a piston four-way valve, and the technical scheme can be applied.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, and various modifications and variations can be made to the embodiments of the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A four-way valve, comprising:
the main four-way valve (10), the main four-way valve (10) comprises an input liquid port and three reversing liquid ports;
a pilot four-way valve (20) connected to the main four-way valve (10) for controlling the flow path direction in the main four-way valve (10);
the four-way valve is characterized by further comprising:
the flow path control valve (30), the flow path control valve (30) is arranged on a control liquid path of which the input liquid port of the main four-way valve (10) is connected with the pilot four-way valve (20), and the flow path control valve (30) is used for controlling the opening and closing of the control liquid path so as to control the refrigerant quantity entering the control cavity (11) of the main four-way valve (10) through the pilot four-way valve (20).
2. The four-way valve according to claim 1, wherein the flow path control valve (30) is an electronically controlled on-off valve.
3. The four-way valve according to claim 1, wherein the flow path control valve (30) is a mechanical on-off valve.
4. The four-way valve according to claim 1, further comprising a detector for detecting whether the main four-way valve (10) has completed a reversing action, wherein the flow path control valve (30) controls the control liquid path to be closed after the detector detects that the main four-way valve (10) has completed a reversing action.
5. The four-way valve according to claim 1, further comprising a pilot solenoid valve (40), the pilot solenoid valve (40) being connected to the pilot four-way valve (20), the pilot solenoid valve (40) being adapted to control a flow path direction in the pilot four-way valve (20).
6. A refrigeration system, comprising:
a condenser (50);
an evaporator (60) connected to the condenser (50);
a compressor (70) connected to the condenser (50) and the evaporator (60) through four-way valves, respectively;
characterized in that the four-way valve is a four-way valve according to any one of claims 1 to 5.
7. The refrigerant system as set forth in claim 6, wherein said four-way valve further comprises:
the detector is used for detecting whether the main four-way valve (10) finishes reversing action, and the flow path control valve (30) controls the control liquid path to be closed after the detector detects that the main four-way valve (10) finishes reversing action;
and a pilot electromagnetic valve (40) connected to the pilot four-way valve (20), wherein the pilot electromagnetic valve (40) is used for controlling the flow path direction in the pilot four-way valve (20).
8. A control method of a refrigeration system, wherein the control method of the refrigeration system is used for controlling the refrigeration system according to claim 7, the refrigeration system includes a refrigeration start state, and the control method of the refrigeration system includes:
-controlling the flow path control valve (30) to open the control liquid path while the compressor (70) is started;
detecting whether a first pressure difference between the pressure at the outlet of the condenser (50) and the pressure at the inlet of the compressor (70) is lower than a first preset value or not through the detector, if the first pressure difference is lower than the first preset value, judging that the main four-way valve (10) finishes reversing action, and controlling the control liquid path to be closed through the flow path control valve (30);
and controlling the pilot electromagnetic valve (40) to be closed.
9. The method of controlling a refrigeration system according to claim 8, wherein the refrigeration system further includes entering a defrost state, the method of controlling a refrigeration system comprising:
firstly controlling the opening of the flow path control valve (30);
detecting whether a second pressure difference between the pressure at the outlet of the condenser (50) and the pressure at the inlet of the compressor (70) is lower than a second preset value or not through the detector, judging that the main four-way valve (10) finishes reversing action if the second pressure difference is lower than the second preset value, and controlling the control liquid path to be closed through the flow path control valve (30);
the pilot electromagnetic valve (40) is controlled to be kept in an open state.
10. The method of controlling a refrigeration system as recited in claim 9 wherein the refrigeration system further includes exiting a defrost state, the method of controlling a refrigeration system comprising:
firstly controlling the opening of the flow path control valve (30);
detecting whether a third pressure difference between the pressure at the outlet of the condenser (50) and the pressure at the inlet of the compressor (70) is higher than a third preset value or not through the detector, judging that the main four-way valve (10) finishes reversing action if the third pressure difference is higher than the third preset value, and controlling the control liquid path to be closed through the flow path control valve (30);
and controlling the pilot electromagnetic valve (40) to be closed.
11. The control method of a refrigeration system according to claim 9, wherein the refrigeration system further includes a heating start state, the control method of the refrigeration system including:
-controlling the flow path control valve (30) to open the control liquid path while the compressor (70) is started;
detecting whether a fourth pressure difference between the pressure at the outlet of the condenser (50) and the pressure at the inlet of the compressor (70) is higher than a fourth preset value by the detector, if the fourth pressure difference is higher than the fourth preset value, judging that the main four-way valve (10) finishes reversing action, and controlling the control liquid path to be closed by the flow path control valve (30);
the pilot solenoid valve (40) is controlled to remain open.
CN201711168542.XA 2017-11-21 2017-11-21 Four-way valve, refrigerating system and control method of refrigerating system Active CN107990583B (en)

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