CN107477928B - Throttle mechanism, refrigerating system and control method of refrigerating system - Google Patents

Throttle mechanism, refrigerating system and control method of refrigerating system Download PDF

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Publication number
CN107477928B
CN107477928B CN201710873598.9A CN201710873598A CN107477928B CN 107477928 B CN107477928 B CN 107477928B CN 201710873598 A CN201710873598 A CN 201710873598A CN 107477928 B CN107477928 B CN 107477928B
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China
Prior art keywords
working state
port
suction superheat
throttling
refrigerant
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CN201710873598.9A
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Chinese (zh)
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CN107477928A (en
Inventor
李金奎
代咪咪
刘幸
杨虹
谢俊锋
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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 CN201710873598.9A priority Critical patent/CN107477928B/en
Publication of CN107477928A publication Critical patent/CN107477928A/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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes
    • 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
    • F25B2600/2513—Expansion 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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)

Abstract

The application discloses a throttling mechanism, a refrigerating system and a control method of the refrigerating system. The throttle mechanism has a first refrigerant flow port and a second refrigerant flow port and includes a main throttle device, an auxiliary throttle device, and a control device. The throttle mechanism has a first operating state in which the control device controls the flow of refrigerant entering the throttle mechanism from the first refrigerant flow port to the second refrigerant flow port through the main throttle device and a second operating state. In the second operating state, the control device controls the refrigerant entering the throttle mechanism from the first refrigerant flow port to flow to the second refrigerant flow port through the primary throttle device and the secondary throttle device connected in series. The throttling mechanism of the application improves the problem of larger throttling noise of the refrigerating system in the prior art.

Description

Throttle mechanism, refrigerating system and control method of refrigerating system
Technical Field
The application relates to the technical field of refrigeration, in particular to a throttling mechanism, a refrigeration system and a control method of the refrigeration system.
Background
Under the freezing condition, the temperature in the container can reach minus 30 ℃ at the lowest, and the temperature outside the container can reach more than 50 ℃ at the highest due to the marine transportation environment. The container refrigeration system therefore needs to operate reliably under conditions of high pressure differential. Most of the current container refrigeration systems adopt a pressure difference liquid supply mode. Under the high pressure difference working condition, the air suction amount of the refrigerating system is small, the refrigerant circulation amount of the refrigerating system is small, the opening degree of the throttling device becomes small, and at the moment, the throttling device can generate howling, so that the user experience of the refrigerating system is seriously affected.
In addition, when the container refrigeration system starts to cool down, the temperature inside and outside the container may be about 40 ℃ or even higher, and the refrigerant circulation amount of the refrigeration system is large. When the opening of the throttling device is opened to the maximum, the suction superheat degree is still large after the refrigerant passes through the evaporator, so that the liquid supply of the evaporator is insufficient.
Disclosure of Invention
The application aims to provide a throttling mechanism, a refrigerating system and a control method of the refrigerating system, so as to solve the problem that a throttling device in the prior art has large throttling noise.
A first aspect of the present application provides a throttle mechanism having a first refrigerant flow port and a second refrigerant flow port and comprising a main throttle device, an auxiliary throttle device and a control device, the throttle mechanism having a first operating state in which the control device controls the flow of refrigerant entering the throttle mechanism from the first refrigerant flow port to the second refrigerant flow port through the main throttle device and a second operating state; in the second working state, the control device controls the refrigerant entering the throttling mechanism from the first refrigerant circulation port to flow to the second refrigerant circulation port through the main throttling device and the auxiliary throttling device which are connected in series.
Further, the main throttle device has a first port and a second port, the throttle mechanism further includes a first flow path and a second flow path disposed between the first refrigerant flow port and the first port of the main throttle device, the auxiliary throttle device is disposed on the second flow path, the second port of the main throttle device communicates with the second refrigerant flow port, and in the first operating state, the control device controls the first flow path to communicate and controls the second flow path to open; in the second working state, the control device controls the first flow path to be disconnected and controls the second flow path to be connected.
Further, the control device comprises a first on-off valve arranged on the first flow path to control the on-off of the first flow path and a second on-off valve arranged on the second flow path to control the on-off of the second flow path.
Further, the second on-off valve is arranged between the main throttling device and the auxiliary throttling device.
Further, the control device further includes a third shutoff valve disposed between the auxiliary throttle device and the second refrigerant flow port.
Further, the primary throttle device comprises an expansion valve or a capillary tube; and/or the secondary throttling means comprises an expansion valve or a capillary tube.
Further, the throttle mechanism further has a third operating state in which the control device controls the refrigerant flowing from the first refrigerant flow port into the throttle mechanism to flow to the second refrigerant flow port through the main throttle device and the auxiliary throttle device, respectively.
Further, the throttle mechanism further has a third operating state in which the control device controls the refrigerant flowing from the first refrigerant circulation port into the throttle mechanism to flow to the second refrigerant circulation port through the main throttle device and the auxiliary throttle device, respectively, the auxiliary throttle device has a first port and a second port, the first port of the auxiliary throttle device communicates with the first refrigerant circulation port, the throttle mechanism further includes a third flow path provided between the second port of the auxiliary throttle device and the second refrigerant circulation port, and in the first operating state, the control device controls the third flow path to be disconnected; in the third working state, the control device controls the first flow path to be communicated and controls the third flow path to be communicated.
A second aspect of the present application provides a refrigeration system comprising a compressor, a condenser, a throttle mechanism as provided in any one of the first aspects of the present application, and an evaporator connected in sequence, the first refrigerant flow port being in communication with the condenser, the second refrigerant flow port being in communication with the evaporator.
Further, the refrigeration system includes a container refrigeration system.
A third aspect of the present application provides a control method for a refrigeration system according to the second aspect of the present application, including the steps of:
acquiring a current suction superheat value of the compressor and a current pressure difference value between discharge pressure and suction pressure of the compressor;
and controlling whether the throttling mechanism is in the first working state or the second working state according to the current suction superheat value and the current pressure difference value.
Further, the refrigeration system has a set suction superheat value range and a set pressure difference value, and controlling whether the throttle mechanism is in the first working state or the second working state according to the current suction superheat value and the current pressure difference value includes:
when the current suction superheat value is within the set suction superheat value range,
if the current pressure difference value is smaller than the set pressure difference value, controlling the throttling mechanism to be in the first working state; and if the current pressure difference value is not smaller than the set pressure difference value, controlling the throttling mechanism to be in the second working state.
Further, the throttle mechanism further has a third operating state in which the refrigerant entering the throttle mechanism from the first refrigerant flow port flows to the second refrigerant flow port through the main throttle device and the auxiliary throttle device, respectively, the control method further comprising:
when the current air suction superheat value is smaller than or equal to the minimum value of the set air suction superheat range, controlling the throttling mechanism to be in the first working state; and when the current suction superheat value is greater than or equal to the maximum value of the set suction superheat value range, controlling the throttling mechanism to be in the third working state.
Further, when the current suction superheat values continuously acquired in the first time period are all in the set suction superheat value range, controlling the throttling mechanism according to the current pressure difference value; when the current suction superheat degree continuously acquired in the second time period is smaller than or equal to the minimum value of the set suction superheat degree value range, controlling the throttling mechanism to be in the first working state; and when the current suction superheat values continuously acquired in the third time period are all larger than or equal to the maximum value of the set suction superheat value range, controlling the throttling mechanism to be in the third working state.
Based on the throttling mechanism, the refrigerating system and the control method of the refrigerating system provided by the application, the throttling mechanism is provided with a first refrigerant circulation port and a second refrigerant circulation port and comprises a main throttling device, an auxiliary throttling device and a control device, the throttling mechanism is provided with a first working state and a second working state, and in the first working state, the control device controls the refrigerant entering the throttling mechanism from the first refrigerant circulation port to flow to the second refrigerant circulation port through the main throttling device; in the second operating state, the control device controls the refrigerant entering the throttle mechanism from the first refrigerant flow port to flow to the second refrigerant flow port through the primary throttle device and the secondary throttle device connected in series. When the throttling mechanism is used for the refrigerating system, the throttling mechanism can be controlled to be in a second working state when the refrigerating system is in a high pressure difference working condition, so that the pressure of the refrigerant condensed by the condenser is reduced by first throttling through the auxiliary throttling device, and then throttling is performed through the main throttling device, and the problem that the noise is large when the refrigerating system in the prior art only performs one throttling through the expansion valve is solved.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
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 and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application.
Each reference numeral represents:
1-a compressor; a 2-condenser; 3-a throttle mechanism; 31-a main expansion valve; 32-capillary; 33-a first on-off control valve; 34-a second on-off control valve; 35-a third on-off control valve; 4-an evaporator; 5-a reservoir; 6-drying the filter; 7-plate heat exchanger; 8-an expansion valve; 9-electromagnetic valve.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Referring to fig. 1, a throttle mechanism 3 of an embodiment of the present application has a first refrigerant flow port FI and a second refrigerant flow port FO and includes a main throttle device, an auxiliary throttle device, and a control device. The throttle mechanism has a first working state and a second working state, in the first working state, the control device controls the refrigerant entering the throttle mechanism from the first refrigerant circulation port to flow to the second refrigerant circulation port through the main throttle device; in the second operating state, the control device flows the refrigerant entering the throttle mechanism from the first refrigerant flow port to the second refrigerant flow port through the primary throttle device and the secondary throttle device connected in series.
When the throttling mechanism is used for a refrigerating system, the throttling mechanism 3 can be controlled to be in a second working state when the refrigerating system is in a high-pressure difference working condition, so that the pressure of the refrigerant condensed by the condenser is reduced by one-time throttling through the auxiliary throttling device, and then the pressure of the refrigerant is reduced by one-time throttling through the main throttling device, that is, the throttling mechanism in the embodiment of the application throttles the refrigerant step by step to reduce the pressure of the refrigerant step by step, thereby solving the problem of larger noise caused by the fact that the refrigerating system in the prior art throttles only once through the expansion valve. When the refrigeration system is in a normal pressure difference working condition, the throttling mechanism can be controlled to be in a first working state, so that the refrigerant condensed by the condenser is throttled only by the main throttling device, and the supply quantity of the refrigerant is regulated normally. In summary, the throttling mechanism of the embodiment of the application solves the problem of larger throttling noise existing in the throttling device of the refrigeration system in the prior art.
The control method of the refrigerating system provided by the embodiment of the application comprises the following steps:
acquiring a current suction superheat value of a compressor and a current pressure difference value between discharge pressure and suction pressure of the compressor;
and controlling whether the throttling mechanism is in a first working state or in a second working state according to the current suction superheat value and the current pressure difference value.
The refrigeration system of this embodiment has a set suction superheat range and a set pressure differential. And when the current suction superheat value is in the set suction superheat value range, controlling whether the throttling mechanism is in the first working state or the second working state according to the current pressure difference value.
Specifically, if the current pressure difference value is smaller than the set pressure difference value, the throttle mechanism is controlled to be in a first working state; and if the current pressure difference is not smaller than the set pressure difference, controlling the throttling mechanism to be in a second working state.
The control method of the refrigerating system can control the working state of the throttling mechanism according to the current working condition of the refrigerating system, so that the reduction of throttling noise is realized.
The structure of the throttle mechanism and the structure and control method of the refrigeration system according to an embodiment of the present application will be described in detail with reference to fig. 1.
In this embodiment, the refrigeration system is a container refrigeration system.
As shown in fig. 1, in the present embodiment, the refrigeration system includes a compressor 1, a condenser 2, a throttle mechanism 3, and an evaporator 4, which are connected in this order.
The throttle mechanism 3 includes a first refrigerant flow port FI, a second refrigerant flow port FO, and a main throttle device and an auxiliary throttle device provided between the first refrigerant flow port FI and the second refrigerant flow port FO. In this embodiment, the main throttle device is a main expansion valve 31, and the auxiliary throttle device is a capillary tube 32. Of course, in embodiments not shown in other figures, the primary restriction may also be a capillary tube and the secondary restriction may be an expansion valve.
The main expansion valve 31 has a first port and a second port. The second port of the main expansion valve 31 communicates with the second refrigerant flow port FO. The throttle mechanism 3 includes a first flow path and a second flow path provided between the first refrigerant flow port FI and the first port of the main expansion valve 31. Capillary tube 32 is disposed in the second flow path. In the first working state, the control device controls the first flow path to be communicated and the second flow path to be disconnected. In the second working state, the control device controls the first flow path to be disconnected and the second flow path to be connected.
Specifically, the control device includes a first on-off valve 33 provided on the first flow path and a second on-off valve 34 provided on the second flow path. In the first operation state, the first on-off valve 33 is controlled to be in the on state and the second on-off valve 34 is controlled to be in the off state so that the first refrigerant flow port FI communicates with the first port of the main expansion valve 31 through the first flow path. In the second operating state, the second on-off valve 34 is controlled to be in the on-state and the first on-off valve 33 is controlled to be in the off-state so that the first refrigerant flow port FI communicates with the first port of the main expansion valve 31 through the second flow path.
Specifically, in the present embodiment, the first port of the capillary tube 32 communicates with the first refrigerant flow port, and the second on-off valve 34 is provided between the second port of the capillary tube 32 and the first port of the main expansion valve 31.
In an embodiment not shown in the drawings, the second port of the capillary tube 32 is in communication with the main expansion valve 31, in which case the control means may comprise an on-off valve disposed between the first port of the capillary tube 32 and the first refrigerant flow port. The control device may further comprise a reversing valve. The inlet of the reversing valve communicates with the first refrigerant flow port FI, the first outlet of the reversing valve communicates with the first port of the main expansion valve 31, and the second outlet of the reversing valve communicates with the capillary tube 32. The reversing valve has a first position in which the inlet of the reversing valve is in communication with the first outlet, and a second position in which the first refrigerant flow port is in communication with the first port of the main expansion valve; in the second position, the inlet of the reversing valve communicates with the second outlet, at which time the first refrigerant flow port communicates with the first port of the main expansion valve 31 via capillary tube 32 to achieve stepwise throttling to reduce throttling noise.
Preferably, the throttle mechanism of the present embodiment further has a third operating state. In the third operating state, the refrigerant that has entered the throttle mechanism from the first refrigerant flow port flows to the second refrigerant flow port through the main expansion valve and the capillary tube, respectively. When the superheat degree of the refrigeration system of the embodiment is higher, the throttling mechanism can be controlled to be in a third working state, so that the refrigerant liquid condensed by the condenser enters the evaporator together through the capillary tube and the main expansion valve, and the liquid supply of the refrigeration system is sufficient, and the refrigeration capacity is ensured.
Specifically in this embodiment, the first port of capillary tube 32 communicates with the first refrigerant flow port. The throttle mechanism further includes a third flow path provided between the second port of the capillary tube 32 and the second refrigerant flow port. In the first working state, the control device controls the first flow path to be communicated and controls the third flow path to be disconnected; in the third working state, the control device controls the first flow path to be communicated and controls the third flow path to be communicated.
Specifically, the control device of the present embodiment further includes a third on-off valve 35 provided between the second port of the capillary tube 32 and the second refrigerant flow port. When the current suction superheat value of the refrigeration system is equal to or greater than the maximum value of the set suction superheat value range, the second on-off valve 34 is controlled to be in an off state, and the first on-off valve 33 and the third on-off valve 35 are controlled to be in an on state so that the first flow path and the third flow path are both communicated. At this time, the refrigerant flows to the evaporator together through the capillary tube 32 and the main expansion valve 31, thereby effectively securing the liquid supply amount of the evaporator.
Preferably, the refrigeration system of the present embodiment further includes a detection device. The detection device is used for acquiring the suction pressure P0, the discharge pressure Pe and the suction temperature T0 of the refrigerating system.
The control method of the refrigerating system of the embodiment comprises the following steps:
acquiring a current suction superheat value of a compressor and a current pressure difference value between discharge pressure Pe and suction pressure P0 of the compressor;
and controlling whether the throttling mechanism is in a first working state or a second working state according to the current suction superheat value and the current pressure difference value.
Specifically, controlling whether the throttle mechanism is in the first working state or the second working state according to the current suction superheat value and the current pressure difference value includes:
and when the current suction superheat value is in the set suction superheat value range, controlling whether the throttling mechanism is in the first working state or the second working state according to the current pressure difference value.
The method comprises the following steps: if the current pressure difference value is smaller than the set pressure difference value, controlling the refrigeration system to be in a first working state; and if the current pressure difference is not smaller than the set pressure difference, controlling the throttling mechanism to be in a second working state.
In this embodiment, if the current pressure difference is smaller than the set pressure difference, the first on-off control valve 33 is controlled to be connected, the second on-off control valve 34 and the third on-off control valve 35 are controlled to be disconnected, and at this time, the refrigerant only enters the evaporator through the main expansion valve 31, and at this time, the main expansion valve 31 can normally adjust the supply amount of the refrigerant due to the fact that the liquid supply of the refrigeration system is normal due to the small pressure difference, and the refrigeration system is stable in operation. If the current pressure difference is not smaller than the set pressure difference, the first on-off control valve and the third on-off control valve are controlled to be disconnected, and the second on-off control valve 34 is controlled to be connected, at this time, the refrigerant liquid condensed by the condenser is throttled once through the capillary tube to reduce the pressure of the refrigerant liquid, and then the refrigerant liquid passes through the main expansion valve, so that noise generated when the refrigerant liquid passes through the main expansion valve is reduced.
When the current suction superheat value is not in the set suction superheat value range, the control method comprises the following steps of controlling the throttling mechanism to be in a first working state when the current suction superheat value is smaller than or equal to the minimum value of the set suction superheat value range; and when the current suction superheat value is greater than or equal to the maximum value of the set suction superheat value range, controlling the throttling mechanism to be in a third working state.
If the current suction superheat value is greater than or equal to the maximum value of the set suction superheat value range, the first on-off control valve 33 and the third on-off control valve 35 are controlled to be communicated and the second on-off control valve 34 is controlled to be disconnected, so that the refrigerant liquid output by the condenser enters the evaporator together through the main expansion valve and the capillary tube, and the sufficient liquid supply is ensured to ensure the refrigerating capacity of the refrigerating system. If the current suction superheat value is less than or equal to the minimum value of the set suction superheat value range, the first on-off control valve 33 is controlled to be communicated, and the second on-off control valve 34 and the third on-off control valve 35 are controlled to be disconnected, so that the refrigeration system is controlled by the main expansion valve.
Preferably, when the current suction superheat values continuously acquired by the refrigeration system in the first time period are all in the set suction superheat value range, the working state of the throttling mechanism is controlled according to the current pressure difference value.
When the current suction superheat value continuously acquired by the refrigeration system in the second time period is smaller than or equal to the minimum value of the set suction superheat value range, the first on-off control valve 33 is controlled to be communicated, and the second on-off control valve 34 and the third on-off control valve 35 are controlled to be disconnected, so that the refrigeration system is controlled by the main expansion valve.
When the current suction superheat degree continuously acquired by the refrigeration system in the third time period is greater than or equal to the maximum value of the set suction superheat degree range, the first on-off control valve 33 and the third on-off control valve 35 are controlled to be communicated and the second on-off control valve 34 is controlled to be disconnected, so that the refrigerant liquid output by the condenser enters the evaporator together through the main expansion valve and the capillary tube, and the sufficient liquid supply is ensured to ensure the refrigeration capacity of the refrigeration system.
In particular, in this embodiment, the first time period is 1 minute, and the second time period and the third time period are both 10 minutes.
In summary, the control method of the refrigeration system of the present embodiment takes the determination condition of the current suction superheat value as the priority condition. And when the current suction superheat value is not in the set suction superheat value range, controlling the throttling mechanism to be in a first working state or a third working state according to the current suction superheat value. And when the current suction superheat value is in the set suction superheat value range, controlling the throttling mechanism to be in a first working state or a second working state according to the current pressure difference value.
As shown in fig. 1, the refrigeration system of the present embodiment further includes an intermediate air supplementing device. The middle air supplementing device comprises a plate heat exchanger 7, an expansion valve 8 and an electromagnetic valve 9. The compressor 1 has a gas supply port. When the compressor needs to be supplemented, the electromagnetic valve 9 is opened to enable part of high-temperature and high-pressure refrigerant liquid to be throttled and depressurized through the expansion valve 8 to form low-temperature and low-pressure refrigerant liquid, and the part of low-temperature and low-pressure refrigerant liquid exchanges heat with the high-temperature and high-pressure refrigerant liquid through the plate heat exchanger 7 to form low-temperature and low-pressure refrigerant gas which enters the air supplementing port of the compressor to supplement the air of the compressor.
The refrigeration system of the present embodiment further includes a receiver 5 and a dry filter 6 disposed between the condenser 2 and the intermediate air supplementing device.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.

Claims (11)

1. A refrigeration system, comprising a compressor, a condenser, a throttle mechanism and an evaporator which are connected in sequence, wherein the throttle mechanism is provided with a first refrigerant circulation port and a second refrigerant circulation port, the first refrigerant circulation port is communicated with the condenser, the second refrigerant circulation port is communicated with the evaporator, the throttle mechanism comprises a main throttle device, an auxiliary throttle device and a control device, the throttle mechanism is provided with a first working state, a second working state and a third working state, and the control device is configured to control whether the throttle mechanism is in the first working state, the second working state or the third working state according to the current suction superheat value and the current pressure difference value of the compressor, and the judgment condition of the current suction superheat value is taken as a priority condition: when the current suction superheat value is not in the set suction superheat value range, the throttle mechanism is controlled to be in a first working state or a third working state according to the current suction superheat value, when the current suction superheat value is in the set suction superheat value range, the throttle mechanism is controlled to be in the first working state or the second working state according to the current pressure difference value, and in the first working state, the control device controls the refrigerant entering the throttle mechanism from the first refrigerant circulation port to flow to the second refrigerant circulation port through the main throttle device; in the second working state, the control device controls the refrigerant entering the throttling mechanism from the first refrigerant flowing port to flow to the second refrigerant flowing port through the main throttling device and the auxiliary throttling device which are connected in series, and the throttling mechanism also has a third working state, and in the third working state, the control device controls the refrigerant entering the throttling mechanism from the first refrigerant flowing port to flow to the second refrigerant flowing port through the main throttling device and the auxiliary throttling device respectively.
2. The refrigeration system of claim 1, wherein the primary throttling means has a first port and a second port, the throttling mechanism (3) further comprising a first flow path and a second flow path disposed between the first refrigerant flow port and the first port of the primary throttling means, the secondary throttling means being disposed on the second flow path, the second port of the primary throttling means being in communication with the second refrigerant flow port, the control means controlling the first flow path to be in communication and the second flow path to be out of communication in the first operating state; in the second working state, the control device controls the first flow path to be disconnected and controls the second flow path to be connected.
3. A refrigeration system according to claim 2, wherein the control means comprises a first on-off valve (33) provided on the first flow path to control on-off of the first flow path and a second on-off valve (34) provided on the second flow path to control on-off of the second flow path.
4. A refrigeration system according to claim 3, wherein the second on-off valve (34) is disposed between the first port of the primary throttling means and the secondary throttling means.
5. The refrigeration system of claim 4, wherein the control device further comprises a third on-off valve (35) disposed between the secondary throttling device and the second refrigerant flow port.
6. The refrigeration system of claim 1, wherein the primary throttling means comprises an expansion valve or a capillary tube; and/or the secondary throttling means comprises an expansion valve or a capillary tube.
7. The refrigeration system according to any one of claims 2 to 5 wherein said throttle mechanism further has a third operating condition in which said control device controls the flow of refrigerant entering said throttle mechanism from said first refrigerant flow port to said second refrigerant flow port through said primary throttle device and said secondary throttle device, respectively, said secondary throttle device having a first port and a second port, said first port of said secondary throttle device being in communication with said first refrigerant flow port, said throttle mechanism further comprising a third flow path disposed between said second port of said secondary throttle device and said second refrigerant flow port, said control device controlling the opening of said third flow path in said first operating condition; in the third working state, the control device controls the first flow path to be communicated and controls the third flow path to be communicated.
8. The refrigeration system of claim 1 wherein the refrigeration system comprises a container refrigeration system.
9. A control method based on the refrigeration system according to any one of claims 1 to 8, characterized by comprising the steps of:
acquiring a current suction superheat value of the compressor and a current pressure difference value between discharge pressure and suction pressure of the compressor;
controlling whether the throttling mechanism is in the first working state, the second working state or the third working state according to the current suction superheat value and the current pressure difference value, and taking the judgment condition of the current suction superheat value as a priority condition: when the current suction superheat value is not in the set suction superheat value range, controlling a throttling mechanism to be in a first working state or a third working state according to the current suction superheat value, and when the current suction superheat value is smaller than or equal to the minimum value of the set suction superheat value range, controlling the throttling mechanism to be in the first working state; when the current air suction superheat value is greater than or equal to the maximum value of the set air suction superheat value range, controlling the throttling mechanism to be in the third working state; and when the current suction superheat value is in the set suction superheat value range, controlling the throttling mechanism to be in a first working state or a second working state according to the current pressure difference value.
10. The method of claim 9, wherein the refrigeration system has a set suction superheat value range and a set pressure difference, and wherein controlling whether the throttle mechanism is in the first operating state or the second operating state based on the current suction superheat value and the current pressure difference comprises:
when the current suction superheat value is within the set suction superheat value range,
if the current pressure difference value is smaller than the set pressure difference value, controlling the throttling mechanism to be in the first working state; and if the current pressure difference value is not smaller than the set pressure difference value, controlling the throttling mechanism to be in the second working state.
11. The control method of a refrigeration system according to claim 9, wherein when the current suction superheat values continuously acquired in the first period of time are all within the set suction superheat value range, the throttle mechanism is controlled in accordance with the current pressure difference value; when the current suction superheat degree continuously acquired in the second time period is smaller than or equal to the minimum value of the set suction superheat degree value range, controlling the throttling mechanism to be in the first working state; and when the current suction superheat values continuously acquired in the third time period are all larger than or equal to the maximum value of the set suction superheat value range, controlling the throttling mechanism to be in the third working state.
CN201710873598.9A 2017-09-25 2017-09-25 Throttle mechanism, refrigerating system and control method of refrigerating system Active CN107477928B (en)

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* Cited by examiner, † Cited by third party
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JPH02290471A (en) * 1989-02-10 1990-11-30 Mitsubishi Electric Corp Air-conditioner
JPH08121879A (en) * 1994-10-26 1996-05-17 Mitsubishi Heavy Ind Ltd Refrigerating and air conditioning apparatus
CN1190723A (en) * 1997-02-11 1998-08-19 三星电子株式会社 Power changeable air conditioner
CN1995875A (en) * 2006-01-05 2007-07-11 松下电器产业株式会社 Variable-capacity air conditioner
CN202973686U (en) * 2012-12-19 2013-06-05 海信（山东）空调有限公司 Throttling device of variable frequency air conditioner and air conditioner
CN103322681A (en) * 2013-07-08 2013-09-25 浙江正理生能科技有限公司 Heat-pump water heater cold shielding system for protecting compressor
CN106546039A (en) * 2017-02-06 2017-03-29 刘勇 Suitable for the carbon dioxide heat-pump expansion throttling device and heat pump under weather of extremely trembling with fear
CN207407553U (en) * 2017-09-25 2018-05-25 珠海格力电器股份有限公司 throttle mechanism and refrigeration system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02290471A (en) * 1989-02-10 1990-11-30 Mitsubishi Electric Corp Air-conditioner
JPH08121879A (en) * 1994-10-26 1996-05-17 Mitsubishi Heavy Ind Ltd Refrigerating and air conditioning apparatus
CN1190723A (en) * 1997-02-11 1998-08-19 三星电子株式会社 Power changeable air conditioner
CN1995875A (en) * 2006-01-05 2007-07-11 松下电器产业株式会社 Variable-capacity air conditioner
CN202973686U (en) * 2012-12-19 2013-06-05 海信（山东）空调有限公司 Throttling device of variable frequency air conditioner and air conditioner
CN103322681A (en) * 2013-07-08 2013-09-25 浙江正理生能科技有限公司 Heat-pump water heater cold shielding system for protecting compressor
CN106546039A (en) * 2017-02-06 2017-03-29 刘勇 Suitable for the carbon dioxide heat-pump expansion throttling device and heat pump under weather of extremely trembling with fear
CN207407553U (en) * 2017-09-25 2018-05-25 珠海格力电器股份有限公司 throttle mechanism and refrigeration system

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