Refrigeration system

Abstract

The application relates to the field of refrigeration technology, in particular to a refrigeration system. An electromagnetic switching valve comprises a valve body, the valve body having a valve cavity and a D interface; a valve seat, the valve seat being located in the valve cavity, the valve seat having an E interface, an S interface and a C interface; a slider, the slider being capable of sliding along the valve seat, so that the electromagnetic switching valve has three working positions, the slider having a slider inner cavity and a shielding part, the slider inner cavity having a first projection on the upper surface of the valve seat, and the shielding part having a second projection on the upper surface of the valve seat; in the first working position, the first projection covers the E interface and the S interface, the slider inner cavity is connected with the E interface and the S interface, and the valve cavity is connected with the C interface and the D interface; in the second working position, the first projection covers the S interface and the C interface, the slider inner cavity is connected with the S interface and the C interface, and the valve cavity is connected with the E interface and the D interface; and in the third working position, the first projection covers the S interface, the second projection covers the E interface, the S interface and the E interface form separate flow channels respectively, and the valve cavity is connected with the C interface and the D interface.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and more particularly to a refrigeration system. Background Technology

[0002] In refrigeration systems, four-way valves are typically used to switch the direction of refrigerant flow. A four-way valve generally has two operating positions. When applied to an air conditioning system, during the cooling cycle, the D-connector of the four-way valve is connected to the C-connector, and the E-connector is connected to the S-connector. At this time, the outdoor heat exchanger contains high-temperature, high-pressure gas that releases heat to the outdoor environment, while the indoor heat exchanger contains low-temperature, low-pressure gas that absorbs heat from the indoor environment, achieving indoor cooling. During the heating cycle, the D-connector is connected to the E-connector, and the C-connector is connected to the S-connector. The indoor heat exchanger contains high-temperature, high-pressure gas that releases heat to the indoor environment, achieving indoor heating, while the outdoor heat exchanger contains low-temperature, low-pressure gas, achieving outdoor cooling.

[0003] In practical applications, when an air conditioning system operates in heating mode for an extended period, the outdoor heat exchanger may experience frost buildup. To ensure the normal operation of the air conditioning system, defrosting of the outdoor heat exchanger is necessary. Currently, the common method involves switching the operating position of the four-way valve to put the system into cooling mode, allowing the outdoor heat exchanger to be defrosted by passing high-temperature, high-pressure gas. After defrosting is complete, the operating position of the four-way valve is switched back to heating mode. However, this process leads to a loss of indoor heat supply, reducing indoor comfort. Summary of the Invention

[0004] This application provides a refrigeration system designed to enable the outdoor unit to defrost without altering the thermal state of the indoor heat exchange mechanism, thereby reducing energy loss.

[0005] This application provides an electromagnetic switching valve, the electromagnetic switching valve comprising:

[0006] A valve body having a valve cavity and a D-port, the valve cavity being connected to the D-port;

[0007] A valve seat located in the valve cavity, the valve seat having an E interface, an S interface and a C interface;

[0008] The slider is capable of sliding along the valve seat, so that the electromagnetic switching valve has three working positions. The slider has a slider cavity and a blocking part. The slider cavity has a first projection on the plane where the upper surface of the valve seat is located, and the blocking part has a second projection on the plane where the upper surface of the valve seat is located.

[0009] In the first working position, the first projection covers the E interface and the S interface, the inner cavity of the slider is connected to the E interface and the S interface, and the valve cavity is connected to the C interface and the D interface;

[0010] In the second working position, the first projection covers the S interface and the C interface, the inner cavity of the slider is connected to the S interface and the C interface, and the valve cavity is connected to the E interface and the D interface;

[0011] In the third working position, the first projection covers the S interface, the second projection covers the E interface, the S interface and the E interface are not connected, the S interface and the E interface respectively form separate flow channels, and the valve cavity is connected to the C interface and the D interface.

[0012] In one possible design, there is a gap between the E interface and the S interface, and between the S interface and the C interface;

[0013] Along the axial direction of the electromagnetic switching valve, the size of the second projection is greater than the size of the spacing, but less than the sum of the spacing size and the diameter of the E interface.

[0014] In one possible design, there is a gap between the E interface and the S interface, and between the S interface and the C interface; along the axial direction of the electromagnetic switching valve, the size of the second projection is the same as the size of the gap.

[0015] In one possible design, the electromagnetic switching valve further includes a first pilot valve component, a second pilot valve component, and a sliding element;

[0016] The slider is located in the valve cavity and is able to slide within the valve cavity to approach or move away from the valve seat;

[0017] The valve chamber includes a first chamber, a second chamber, and a third chamber. The first pilot valve component and the second pilot valve component can change the pressure difference between the second chamber and the third chamber, as well as the pressure difference between the first chamber and the second chamber, to switch the sliding direction of the slider and the sliding direction of the slide block, so that the slide block switches between the first working position, the second working position, and the third working position.

[0018] In one possible design, the electromagnetic switching valve further includes a linkage assembly capable of driving the slider to slide along the valve seat;

[0019] The valve body also includes a stop for limiting the sliding position of the sliding member. Under the pressure difference between the cavities at both ends of the sliding member, the sliding member can switch between two positions.

[0020] The slider is in a first position, and the linkage assembly can abut against the slider so that the slider is in the first working position;

[0021] The slider is in the second position, the slider abuts against the stop, and the linkage assembly can slide to the slider being in the second working position or the third working position, and the slider is in the second working position, and the linkage assembly abuts against the slider.

[0022] In one possible design, the linkage assembly includes a linkage and a first piston component and a second piston component fixed at both ends of the linkage;

[0023] The valve chamber further includes a main valve chamber, which is formed between the first piston component and the second piston component. The D interface is connected to the main valve chamber, and the valve seat is located in the main valve chamber.

[0024] In one possible design, the valve body further includes a first valve body and a second valve body, the first valve body and the second valve body being fixedly connected to form the valve cavity, and the through diameter of the first valve body being larger than the through diameter of the second valve body;

[0025] The valve body further includes a first end cap and a second end cap, the first end cap sealing one end of the first valve body, the stop portion being located at the other end of the first valve body, and the second end cap sealing one end of the second valve body.

[0026] The sliding member is in the first position, and the sliding member abuts against the first end cap;

[0027] The slider is in the third working position, and the connecting rod assembly abuts against the second end cap.

[0028] In one possible design, the first pilot valve component is in a de-energized state, the second pilot valve component is in a energized state, the pressure in the third chamber is greater than the pressure in the first chamber and the pressure in the second chamber, the slider slides to abut against the first end cap, and the connecting rod assembly slides to abut against the slider, so that the slider is in the first working position;

[0029] The first pilot valve component is energized, the second pilot valve component is de-energized, the pressure in the first chamber and the pressure in the second chamber are greater than the pressure in the third chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the second end cover, so that the slider is in the second working position;

[0030] The first pilot valve component is in a de-energized state, the second pilot valve component is in a de-energized state, the pressure in the first chamber and the pressure in the third chamber are greater than the pressure in the second chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the sliding member, so that the slider is in the third working position.

[0031] This application also provides a refrigeration system, the refrigeration system comprising:

[0032] The compressor has its outlet connected to the D port of the electromagnetic switching valve and its inlet connected to the S port of the electromagnetic switching valve.

[0033] A three-way valve, wherein the three-way valve has an X port, a Y port and a Z port;

[0034] An outdoor heat exchanger, one end of which is connected to the C port of the electromagnetic switching valve, and the other end of which is connected to the Y port of the three-way valve;

[0035] An indoor heat exchanger, one end of which is connected to the E port of the electromagnetic switching valve, and the other end of which is connected to the X port of the three-way valve.

[0036] An electromagnetic switching valve, wherein the electromagnetic switching valve is the electromagnetic switching valve described above;

[0037] In the first working position, the Z port of the three-way valve is cut off, and the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the Y port of the three-way valve, the X port of the three-way valve, the indoor heat exchanger, the E port of the electromagnetic switching valve, the S port of the electromagnetic switching valve, and the compressor inlet.

[0038] In the second working position, the Z port of the three-way valve is cut off, and the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the E port of the electromagnetic switching valve, the indoor heat exchanger, the X port of the three-way valve, the Y port of the three-way valve, the outdoor heat exchanger, the C port of the electromagnetic switching valve, the S port of the electromagnetic switching valve, and the compressor inlet.

[0039] In the third working position, the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the Y port of the three-way valve, the Z port of the three-way valve, the S port of the electromagnetic switching valve, and the compressor inlet.

[0040] In the third working position, the X port of the three-way valve and the E port of the electromagnetic switching valve are disconnected to seal the refrigerant of the indoor heat exchanger.

[0041] This application also provides a refrigeration system, the refrigeration system comprising:

[0042] The compressor has its outlet connected to the D port of the electromagnetic switching valve and its inlet connected to the S port of the electromagnetic switching valve.

[0043] A first solenoid valve, the first solenoid valve having port A and port B;

[0044] A second solenoid valve, the second solenoid valve having an M port and an N port;

[0045] An outdoor heat exchanger, one end of which is connected to the C port of the electromagnetic switching valve, and the other end of which is connected to the B port of the first electromagnetic valve or the N port of the second electromagnetic valve.

[0046] An indoor heat exchanger, one end of which is connected to the E port of the electromagnetic switching valve, and the other end of which is connected to the A port of the first electromagnetic valve.

[0047] An electromagnetic switching valve, wherein the electromagnetic switching valve is the electromagnetic switching valve described above;

[0048] In the first working position, the M port and N port of the second solenoid valve are cut off, and the refrigerant flows through the compressor outlet, the D port of the solenoid switching valve, the C port of the solenoid switching valve, the outdoor heat exchanger, the B port of the first solenoid valve, the A port of the first solenoid valve, the indoor heat exchanger, the E port of the solenoid switching valve, the S port of the solenoid switching valve, and the compressor inlet.

[0049] In the second working position, the M port and N port of the second solenoid valve are cut off, and the refrigerant flows through the compressor outlet, the D port of the solenoid switching valve, the E port of the solenoid switching valve, the indoor heat exchanger, the A port of the first solenoid valve, the B port of the first solenoid valve, the indoor heat exchanger, the C port of the solenoid switching valve, the S port of the solenoid switching valve, and the compressor inlet.

[0050] In the third working position, the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the N port of the second electromagnetic valve, the M port of the second electromagnetic valve, the S port of the electromagnetic switching valve, and the compressor inlet.

[0051] In the third working position, the A and B ports of the first solenoid valve and the E port of the solenoid switching valve are cut off to seal the refrigerant of the indoor heat exchanger.

[0052] This invention provides an electromagnetic switching valve and a refrigeration system. By optimizing the structure of the electromagnetic switching valve, it has three working positions, enabling the outdoor unit to defrost without changing the heating state of the indoor unit, thus relatively reducing energy loss.

[0053] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the refrigeration system in refrigeration mode in the first embodiment provided in this application;

[0055] Figure 2 A schematic diagram illustrating the principle of the refrigeration system in heating mode in the first embodiment provided in this application;

[0056] Figure 3 This is a schematic diagram of the refrigeration system in defrost mode in the first embodiment provided in this application;

[0057] Figure 4 This is a schematic diagram of the refrigeration system in refrigeration mode in the second embodiment provided in this application;

[0058] Figure 5 This is a schematic diagram of the refrigeration system in heating mode in the second embodiment provided in this application;

[0059] Figure 6 This is a schematic diagram of the refrigeration system in defrost mode in the second embodiment provided in this application;

[0060] Figure 7 A schematic diagram of the electromagnetic switching valve provided in this application in its first working position;

[0061] Figure 8 A schematic diagram of the electromagnetic switching valve provided in this application in its second working position;

[0062] Figure 9 A schematic diagram of the electromagnetic switching valve provided in this application in the third working position;

[0063] Figure 10 This is a partial schematic diagram of the first pilot valve component provided in this application in the power-off state;

[0064] Figure 11 A partial schematic diagram of the first pilot valve component provided in this application in the energized state;

[0065] Figure 12 A partial schematic diagram of the second pilot valve component provided in this application in the energized state;

[0066] Figure 13 This is a partial schematic diagram of the second pilot valve component provided in this application in the power-off state;

[0067] Figure 14 A partial schematic diagram of the slider provided in this application at a first position;

[0068] Figure 15 This is a partial schematic diagram of the slider provided in this application in the second position;

[0069] Figure 16 This is a partial schematic diagram of the slider provided in this application at the first working position;

[0070] Figure 17 This is a partial schematic diagram of the slider provided in this application at the second working position;

[0071] Figure 18 This is a partial schematic diagram of the slider provided in this application in the third working position.

[0072] Figure label:

[0073] 1-Compressor;

[0074] 2-Indoor heat exchanger;

[0075] 3-Outdoor heat exchanger;

[0076] 4-Throttling element;

[0077] 5-Three-way valve;

[0078] 6-Solenoid switching valve;

[0079] 61-Valve body;

[0080] 611 - Valve cavity;

[0081] 611a - First cavity;

[0082] 611b - Second cavity;

[0083] 611c - Third cavity;

[0084] 611d - Main valve chamber;

[0085] 612 - First valve body;

[0086] 613 - Second valve body;

[0087] 614 - First end cap;

[0088] 615 - Second end cap;

[0089] 62-Valve seat;

[0090] 63-Slider;

[0091] 631 - Slider inner cavity;

[0092] 632 - Shielding part;

[0093] 64 - Linkage assembly;

[0094] 641-Linkage;

[0095] 642 - First piston assembly;

[0096] 643 - Second piston assembly;

[0097] 65 - Sliding component;

[0098] 651 - Isolation Department;

[0099] 652 - Connecting part;

[0100] 653 - Limiting part;

[0101] 66 - First pilot valve component;

[0102] 661 - First Drive Unit;

[0103] 661a - First coil;

[0104] 661b - First stationary iron core;

[0105] 661c - First moving iron core;

[0106] 661d - First elastic element;

[0107] 661e - First connecting frame;

[0108] 662 - First pilot valve sleeve;

[0109] 663 - First pilot valve seat;

[0110] 664 - First pilot valve cup;

[0111] 67-Second pilot valve component;

[0112] 671 - Second drive unit;

[0113] 671a - Second coil;

[0114] 671b - Second stationary iron core;

[0115] 671c - Second moving iron core;

[0116] 671d - Second elastic element;

[0117] 671e - Second connecting bracket;

[0118] 672 - Second pilot valve sleeve;

[0119] 673 - Second pilot valve seat;

[0120] 674 - Second pilot valve cup;

[0121] 68-Adapter;

[0122] 681 - First step section;

[0123] 682 - Second step section;

[0124] 7-First solenoid valve;

[0125] 8-Second solenoid valve.

[0126] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0127] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0128] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0129] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0130] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0131] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0132] For ease of understanding and concise description, the following text will explain the electromagnetic switching valve and the refrigeration system equipped with it together, and the beneficial effects will not be discussed again.

[0133] Please refer to Figures 1 to 3 , Figure 1A schematic diagram of the refrigeration system provided in the first embodiment in refrigeration mode; Figure 2 This is a schematic diagram of the refrigeration system provided in the first embodiment in heating mode; Figure 3 This is a schematic diagram of the refrigeration system provided in the first embodiment in defrost mode. As shown in the figure, in this embodiment, the refrigeration system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttling element 4, a three-way valve 5, and a solenoid switching valve 6.

[0134] Among them, the three-way valve 5 is the currently common three-way valve 5 structure, which has two working positions, namely the working position in which its Y port is connected to the X port and the Z port is cut off, and the working position in which its Y port is connected to the Z port and the X port is cut off.

[0135] The electromagnetic switching valve 6 is an improved version of the existing four-way valve in this embodiment. It has three working positions, which will be explained in detail in the description of the working mode of the refrigeration system below.

[0136] The outlet of compressor 1 is connected to the D port of electromagnetic switching valve 6, and the inlet of compressor 1 is connected to the S port of electromagnetic switching valve 6.

[0137] One end of the outdoor heat exchanger 3 is connected to the C port of the solenoid switching valve 6, and the other end is connected to the Y port of the three-way valve 5. One end of the indoor heat exchanger 2 is connected to the E port of the solenoid switching valve 6, and the other end is connected to the X port of the three-way valve 5.

[0138] As set above, the operating modes of this refrigeration system include cooling mode, heating mode, and defrosting mode, which will be explained below.

[0139] like Figure 1 As shown, in cooling mode, the electromagnetic switching valve 6 is in the working position where the D and C ports are connected and the E and S ports are connected, while the three-way valve 5 is in the working position where the X and Y ports are connected and the Z port is closed. The high-temperature and high-pressure refrigerant at the outlet of compressor 1 flows into the outdoor heat exchanger 3 through the D and C ports of the electromagnetic switching valve 6. The outdoor heat exchanger 3 is in heating mode. After passing through the outdoor heat exchanger 3, the high-temperature and high-pressure refrigerant is transformed into low-temperature and low-pressure refrigerant through the throttling element 4. The low-temperature and low-pressure refrigerant flows into the indoor heat exchanger 2 through the Y and X ports of the three-way valve 5. At this time, the indoor heat exchanger 2 is in cooling mode. The low-temperature and low-pressure refrigerant then flows back to compressor 1 through the E and S ports of the electromagnetic switching valve 6.

[0140] like Figure 2As shown, in heating mode, the electromagnetic switching valve 6 is in the working position where the D and E ports are connected and the C and S ports are connected, while the three-way valve 5 is in the working position where the X and Y ports are connected and the Z port is closed. The high-temperature and high-pressure refrigerant at the outlet of compressor 1 flows into the indoor heat exchanger 2 through the D and E ports of the electromagnetic switching valve 6. At this time, the indoor heat exchanger 2 is in heating mode. The high-temperature and high-pressure refrigerant passes through the X and Y ports of the three-way valve 5 and then through the throttling element 4 to become low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows into the outdoor heat exchanger 3. At this time, the outdoor heat exchanger 3 is in cooling mode. The low-temperature and low-pressure refrigerant flowing out of the outdoor heat exchanger 3 then flows back to compressor 1 through the C and S ports of the electromagnetic switching valve 6.

[0141] like Figure 3 As shown, in defrost mode, the solenoid switching valve 6 is in the working position where the D and C ports are connected, and the E and S ports form separate flow paths. The three-way valve 5 is in the working position where the Y and Z ports are connected, and the X port is closed. The high-temperature and high-pressure refrigerant at the outlet of compressor 1 flows into the outdoor heat exchanger 3 through the D and C ports of the solenoid switching valve 6. The outdoor heat exchanger 3 is in heating mode. At this time, the outdoor heat exchanger 3 is in defrost mode. The high-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant after passing through the outdoor heat exchanger 3 and then through the throttling element 4. The low-temperature and low-pressure refrigerant flows back to compressor 1 through the Y port of the three-way valve 5, the Z port of the three-way valve 5, and the S port of the solenoid switching valve 6.

[0142] Among them, the throttling element 4 can be an expansion valve.

[0143] This embodiment combines the electromagnetic switching valve 6 with the conventional three-way valve 5, and forms a separate flow channel through the S interface and the E interface, so that an additional loop is added between the S interface and the throttling element 4. This allows the refrigeration system to have conventional cooling and heating modes, and can also defrost the outdoor heat exchanger 3 without affecting the heating of the indoor heat exchanger 2.

[0144] Please refer to Figures 4 to 6 , Figure 4 A schematic diagram of the refrigeration system provided in the second embodiment in refrigeration mode; Figure 5 A schematic diagram illustrating the principle of the refrigeration system in heating mode according to the second embodiment; Figure 6 This is a schematic diagram of the refrigeration system in defrost mode according to the second embodiment. As shown in the figure, in this embodiment, the refrigeration system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttling element 4, a first solenoid valve 7, a second solenoid valve 8, and a solenoid switching valve 6.

[0145] The difference between this embodiment and the first embodiment is that the three-way valve 5 in the first embodiment is replaced by a first solenoid valve 7 and a second solenoid valve 8. The first solenoid valve 7 has ports A and B, and the second solenoid valve 8 has ports M and N.

[0146] like Figure 4 As shown, in cooling mode, the solenoid switching valve 6 is in the working position where the D and C ports are connected and the E and S ports are connected. The A and B ports of the first solenoid valve 7 are open, and the M and N ports of the second solenoid valve 8 are closed. The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 flows into the outdoor heat exchanger 3 through the D and C ports of the solenoid switching valve 6. The outdoor heat exchanger 3 is in heating mode. After passing through the outdoor heat exchanger 3, the high-temperature and high-pressure refrigerant is converted into low-temperature and low-pressure refrigerant by the throttling element 4. The low-temperature and low-pressure refrigerant flows into the indoor heat exchanger 2 through the B and A ports of the first solenoid valve 7. At this time, the indoor heat exchanger 2 is in cooling mode. The low-temperature and low-pressure refrigerant then flows back to the compressor 1 through the E and S ports of the solenoid switching valve 6.

[0147] like Figure 5 As shown, in heating mode, the solenoid switching valve 6 is in the working position where the D and E ports are connected and the C and S ports are connected. The A and B ports of the first solenoid valve 7 are open, and the M and N ports of the second solenoid valve 8 are closed. The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 flows into the indoor heat exchanger 2 through the D and E ports of the solenoid switching valve 6. At this time, the indoor heat exchanger 2 is in heating mode. The high-temperature and high-pressure refrigerant passes through the A and B ports of the first solenoid valve 7 and becomes low-temperature and low-pressure refrigerant after passing through the throttling element 4. The low-temperature and low-pressure refrigerant flows into the outdoor heat exchanger 3. At this time, the outdoor heat exchanger 3 is in cooling mode. The low-temperature and low-pressure refrigerant flowing out of the outdoor heat exchanger 3 flows back to the compressor 1 through the C and S ports of the solenoid switching valve 6.

[0148] like Figure 6 As shown, in defrost mode, the solenoid switching valve 6 is in the working position where the D and C interfaces are connected, and the E and S interfaces form separate flow paths. The M and N ports of the second solenoid valve 8 are open, and the A and B ports of the first solenoid valve 7 are closed. The high-temperature and high-pressure refrigerant at the outlet of compressor 1 flows into the outdoor heat exchanger 3 through the D and C ports of the solenoid switching valve 6. The outdoor heat exchanger 3 is in heating mode. At this time, the outdoor heat exchanger 3 is in defrost mode. The high-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant after passing through the outdoor heat exchanger 3 and then through the throttling element 4. The low-temperature and low-pressure refrigerant flows back to compressor 1 through the N port of the second solenoid valve 8, the M port of the second solenoid valve 8, and the S port of the solenoid switching valve 6.

[0149] This embodiment utilizes the combination of electromagnetic switching valve 6 with two conventional electromagnetic valves, and forms a separate flow channel through the S interface and E interface, thereby adding a loop between the S interface and the throttling element 4. This allows the refrigeration system to have conventional cooling and heating modes, and also to defrost the outdoor heat exchanger 3 without affecting the heating of the indoor heat exchanger 2.

[0150] As can be seen from the various working modes of the refrigeration system described above, the electromagnetic switching valve 6 can switch between three working positions. Specifically, its slider 63 can switch between three working positions relative to the valve seat 62.

[0151] The specific structure of the electromagnetic switching valve 6 will be described in detail below with reference to the attached diagram.

[0152] Please refer to Figures 7 to 9 , Figure 7 This is a schematic diagram of the electromagnetic switching valve 6 in the first working position in a specific embodiment; Figure 8 This is a schematic diagram of the electromagnetic switching valve 6 in the second working position in a specific embodiment; Figure 9 This is a schematic diagram of the electromagnetic switching valve 6 in the third working position in a specific embodiment.

[0153] In this embodiment, the electromagnetic switching valve 6 includes a valve body 61 with a valve cavity 611, a valve seat 62, a slider 63, and a connecting rod assembly 64.

[0154] The valve body 61 has a D interface, which communicates with the valve cavity 611; the valve seat 62 has an E interface, an S interface, and a C interface; the connecting rod assembly 64 includes a connecting rod 641 and a first piston component 642 and a second piston component 643 fixed at both ends of the connecting rod 641; the slider 63 has a slider inner cavity 631 and a blocking part 632, the bottom surface of the slider 63 is pressed and fitted against the valve seat 62, and can slide along the valve seat 62 under the action of the connecting rod assembly 64.

[0155] In this embodiment, the electromagnetic switching valve 6 further includes a sliding member 65, which includes an isolation part 651.

[0156] The valve chamber 611 includes a large-diameter chamber and a small-diameter chamber. The aforementioned valve seat 62, slider 63 and connecting rod assembly 64 are disposed in the small-diameter chamber. The isolation portion 651 of the slider 65 is located in the large-diameter chamber, and the slider 65 can slide in the valve chamber 611 to approach or move away from the valve seat 62.

[0157] The electromagnetic switching valve 6 also includes a first pilot valve component 66 and a second pilot valve component 67, which work together to change the pressure difference between the two ends of the connecting rod assembly 64 and the pressure difference between the two ends of the sliding member 65, and switch the sliding direction of the slider 63 and the sliding direction of the sliding member 65, so that the slider 63 can switch between three working positions.

[0158] Specifically, when slider 63 is in the first working position, the D and C interfaces of valve seat 62 are connected through valve cavity 611, and the E and S interfaces are connected through slider inner cavity 631; when slider 63 is in the second working position, the D and E interfaces of valve seat 62 are connected through valve cavity 611, and the C and S interfaces are connected through slider inner cavity 631; when slider 63 is in the third working position, the D and C interfaces of valve seat 62 are connected through valve cavity 611, and the E and S interfaces form separate flow paths.

[0159] In this embodiment, the first piston component 642 and the second piston component 643 of the connecting rod assembly 64 are slidably sealed with the valve cavity 611, and the isolation portion 651 of the sliding member 65 is interactively sealed with the valve cavity 611, so as to make the two slide by controlling the pressure difference between the two ends of the connecting rod 641 and the pressure difference between the two ends of the isolation portion 651.

[0160] The first piston component 642 is positioned relatively close to the slider 65, while the second piston component 643 is positioned relatively far away from the slider 65.

[0161] After the above configuration, the valve chamber 611 is divided into four mutually sealed chambers: the first chamber 611a formed between the isolation part 651 of the sliding member 65 and one end wall of the valve body 61; the second chamber 611b formed between the isolation part 651 and the second piston member 643; the third chamber 611c formed between the second piston member 643 and the other end wall of the valve body 61; and the main valve chamber 611d formed between the first piston member 642 and the second piston member 643.

[0162] That is, the first pilot valve component 66 and the second pilot valve component 67 can change the pressure difference between the second chamber 611b and the third chamber 611c, and the pressure difference between the first chamber 611a and the second chamber 611b, thereby switching the sliding direction of the slider 63 and the sliding direction of the slider 65.

[0163] Specifically, the D interface is connected to the main valve chamber 611d. In the refrigeration system, the D interface is connected to the high-pressure end of the system (the outlet end of compressor 1), meaning that the main valve chamber 611d is normally under high pressure. In the refrigeration system, the S interface is connected to the low-pressure end of the system (the inlet end of compressor 1).

[0164] The first pilot valve component 66 controls the pressure difference between the two ends of the control linkage assembly 64, namely the pressure difference between the second chamber 611b and the third chamber 611c. The second pilot valve component 67 changes the pressure of the first chamber 611a, and in conjunction with the first pilot valve component 66, changes the pressure of the second chamber 611b, thereby realizing the pressure difference control between the first chamber 611a and the second chamber 611b.

[0165] Please refer to Figure 10 and Figure 11 , Figure 10This is a partial schematic diagram of the first pilot valve component 66 of the electromagnetic switching valve 6 in the de-energized state in a specific embodiment. Figure 11 This is a partial schematic diagram of the first pilot valve component 66 of the electromagnetic switching valve 6 in the energized state in a specific embodiment.

[0166] In this embodiment, the first pilot valve component 66 includes a first driving part 661, a first pilot valve sleeve 662 having a first cavity, a first pilot valve seat 663, and a first pilot valve cup 664; the first pilot valve seat 663 and the first pilot valve cup 664 are located in the first cavity, and the first pilot valve seat 663 has a first connection port, a second connection port, and a third connection port.

[0167] The first pilot valve bowl 664 is pressed tightly against the first pilot valve seat 663. Under the drive of the first drive unit 661, the first pilot valve bowl 664 can slide along the first pilot valve seat 663 to switch between two working positions: in the first working position, the first connection port and the second connection port are connected through the inner cavity of the first pilot valve bowl 664, and the third connection port is connected to the first sleeve cavity; in the second working position, the first connection port and the first sleeve cavity are connected, and the second connection port and the third connection port are connected through the inner cavity of the first pilot valve bowl 664.

[0168] The first connection port (the connection port on the left in the figure) is connected to the second cavity 611b through capillary e1, the second connection port (the connection port in the middle in the figure) is connected to the S interface through capillary s1, the third connection port (the connection port on the right in the figure) is connected to the third cavity 611c through capillary c1, and the first cavity is connected to the D interface through capillary d1.

[0169] In the specific design, the first drive unit 661 includes a first coil 661a, a first stationary iron core 661b, a first moving iron core 661c, a first elastic element 661d, and a first connecting frame 661e. The first elastic element 661d is located between the first stationary iron core 661b and the first moving iron core 661c. The first connecting frame 661e connects the first moving iron core 661c and the first guide valve cup 664. By controlling the on / off state of the first coil 661a in conjunction with the first elastic element 661d, the first moving iron core 661c is controlled to drive the first connecting frame 661e to move, thereby causing the first guide valve cup 664 to slide, thus controlling the connection state between the interfaces, and further controlling the pressure of the second cavity 611b and the third cavity 611c.

[0170] The first elastic element 661d can be a spring.

[0171] Figure 10As shown, when the first pilot valve component 66 is de-energized, it is located in the first working position. At this time, the second cavity 611b is connected to the S interface through capillary e1, the first connection port, the second connection port, and capillary s1, so that the second cavity 611b is in a low-pressure state; the third cavity 611c is connected to the D interface through capillary c1, the third connection port, the first sleeve cavity, and capillary d1, so that the third cavity 611c is in a high-pressure state.

[0172] Figure 11 As shown, when the first pilot valve component 66 is energized, it is located in the second working position. At this time, the second cavity 611b is connected to the D interface through the capillary e1, the first connection port, the first sleeve cavity, and the capillary d1, so that the second cavity 611b is in a high-pressure state; the third cavity 611c is connected to the S interface through the capillary c1, the third connection port, the second connection port, and the capillary s1, so that the third cavity 611c is in a low-pressure state.

[0173] Please refer to Figure 12 and Figure 13 , Figure 12 This is a partial schematic diagram of the second pilot valve component 67 of the electromagnetic switching valve 6 in the energized state in a specific embodiment. Figure 13 This is a partial schematic diagram of the second pilot valve component 67 of the electromagnetic switching valve 6 in the energized state in a specific embodiment.

[0174] In this embodiment, the second pilot valve component 67 includes a second drive unit 671, a second pilot valve sleeve 672 having a second cavity, a second pilot valve seat 673, and a second pilot valve cup 674; the second pilot valve seat 673 and the second pilot valve cup 674 are located in the second cavity, and the second pilot valve seat 673 has a first interface and a second interface.

[0175] The second pilot valve bowl 674 is pressed tightly against the second pilot valve seat 673. Under the drive of the second drive unit 671, the second pilot valve bowl 674 can slide along the second pilot valve seat 673 to switch between two states: in the first state, the first interface and the second interface are connected through the inner cavity of the second pilot valve bowl 674; in the second state, the first interface is connected to the second sleeve cavity, and the second interface is connected to the inner cavity of the second pilot valve bowl 674.

[0176] The first interface (the interface on the left in the diagram) is connected to the first cavity 611a through capillary e2, the second interface (the interface on the right in the diagram) is connected to the S interface through capillary s2, and the second cavity is connected to the D interface through capillary d2.

[0177] In the specific design, the second drive unit 671 includes a second coil 671a, a second stationary iron core 671b, a second moving iron core 671c, a second elastic element 671d, and a second connecting frame 671e. The second elastic element 671d is located between the second stationary iron core 671b and the second moving iron core 671c, and the second connecting frame 671e connects the second moving iron core 671c and the second guide valve bowl 674. Thus, by switching the second coil 671a on and off, combined with the second elastic element 671d controlling the second moving iron core 671c to drive the second connecting frame 671e to move, thereby driving the second guide valve bowl 674 to slide, thereby controlling the connection state between each interface, and thus controlling the pressure state in the first cavity 611a.

[0178] The second elastic element 671d can be a spring.

[0179] like Figure 12 As shown, when the second coil 671a of the second pilot valve component 67 is energized, the second moving iron core 671c and the second stationary iron core 671b are attracted together, causing the second pilot valve bowl 674 to slide towards the second stationary iron core 671b. The second elastic element 671d is compressed and stores deformation energy. The inner cavity of the second pilot valve bowl 674 is connected to the first interface and the second interface of the second pilot valve seat 673. The second pilot valve component 67 is in the first state. At this time, the first cavity 611a is connected to the S interface through the first interface, the second interface, the capillary tube s2, and the S interface. The first cavity 611a is in a low-pressure state.

[0180] like Figure 13 As shown, when the second coil 671a of the second pilot valve component 67 is de-energized, under the elastic force of the second elastic element 671d, the second moving iron core 671c drives the second pilot valve bowl 674 to slide away from the second stationary iron core 671b. The first interface is connected to the first sleeve cavity, and the second interface is connected to the inner cavity of the second pilot valve bowl 674. The second pilot valve component 67 is in the second state. At this time, the first cavity 611a is connected to the D interface through the first interface, the second sleeve cavity, and the capillary tube d2. The first cavity 611a is in a high-pressure state.

[0181] The electromagnetic switching valve 6 also includes a stop for limiting the sliding position of the slider 65. Specifically, under the pressure difference between the first chamber 611a and the second chamber 611b, the slider 65 can switch between two positions. At the same time, combined with the pressure difference between the second chamber 611b and the third chamber 611c, the slider 63 can switch between the aforementioned three working positions.

[0182] like Figure 7As shown, the first pilot valve component 66 is in a de-energized state, and the second pilot valve component 67 is in a energized state. That is, the first chamber 611a is in a low-pressure state, the second chamber 611b is in a low-pressure state, and the third chamber 611c is in a high-pressure state. In this way, the connecting rod assembly 64 drives the slider 63 to move to the left (as shown in the figure), and pushes the sliding member 65 to move to the left as well, until the sliding member 65 abuts against the corresponding side end wall of the valve body and is in the first position. The connecting rod assembly 64 abuts against the sliding member 65, so that the slider 63 is in the aforementioned first working position. The E interface and the S interface are connected through the inner cavity 631 of the slider, and the C interface and the D interface are connected through the main valve cavity 611d, which is the working position of the electromagnetic switching valve 6 in the refrigeration mode of the aforementioned refrigeration system.

[0183] like Figure 8 As shown, the first pilot valve component 66 is in an energized state, and the second pilot valve component 67 is in an de-energized state. That is to say, the first chamber 611a is in a high-pressure state, the second chamber 611b is in a high-pressure state, and the third chamber 611c is in a low-pressure state. At this time, the sliding member 65 moves to the right to the second position where it abuts against the stop due to the pressure difference at both ends. The connecting rod assembly 64 drives the slider 63 to move to the right to abut against the corresponding side wall of the valve body, so that the slider 63 is in the aforementioned second working position. The C interface and the S interface are connected through the inner cavity 631 of the slider, and the D interface and the E interface are connected through the main valve cavity 611d. That is, the working position of the electromagnetic switching valve 6 in the heating mode of the aforementioned refrigeration system.

[0184] like Figure 9 As shown, the first pilot valve component 66 is in a de-energized state, and the second pilot valve component 67 is in a de-energized state. That is to say, the first chamber 611a is in a high-pressure state, the second chamber 611b is in a low-pressure state, and the third chamber 611c is in a high-pressure state. At this time, the sliding member 65 is held in the second position against the stop part, and the connecting rod assembly 64 drives the slider 63 to move to the left until it abuts against the sliding member 65, so that the slider 63 is in the aforementioned third working position. The S interface is connected to the inner cavity 631 of the slider, and the E interface is covered by the shielding part 632, so that the S interface and the E interface form separate flow channels respectively. The C interface and the D interface are connected through the main valve cavity 611d, which is the working position of the electromagnetic switching valve 6 in the defrost mode of the aforementioned refrigeration system.

[0185] In this embodiment, the valve body includes a first valve body 612 and a second valve body 613. Both the first valve body 612 and the second valve body 613 are cylindrical structures, with their adjacent ends fixedly connected and their inner cavities communicating to form a valve cavity 611. The valve body also includes a first end cap 614 and a second end cap 615. The first end cap 614 blocks one end of the first valve body 612, and the second end cap 615 blocks one end of the second valve body 613. The aforementioned large-diameter cavity is formed in the first cavity 611a, and the small-diameter cavity is formed in the second cavity 611b, that is, the through diameter of the first valve body 612 is larger than the through diameter of the second cavity 611b. With this configuration, the first end cap 614 is one end wall of the valve body, the second end cap 615 is the other end wall of the valve body, the first cavity 611a is formed between the first end cap 614 and the sliding member 65, and the third cavity 611c is formed between the second piston member 643 and the second end cap 615.

[0186] Specifically, the stop portion for limiting the sliding member 65 is provided at the connection between the first valve body 612 and the second valve body 613.

[0187] Please refer to Figure 14 and Figure 15 , Figure 14 A partial schematic diagram of the slider 65 in the first position is shown. Figure 15 A partial schematic diagram of the slider 65 in the second position is shown.

[0188] In this embodiment, the first valve body 612 and the second valve body 613 are specifically fixedly connected by an adapter 68 having a through hole. The adapter 68 includes a first stepped portion 681 and a second stepped portion 682; the first stepped portion 681 has a first stepped surface facing the first valve body 612, and the first valve body 612 is fixedly sleeved on the first stepped portion 681 and abuts against the first stepped surface. Specifically, the two can be fixed by welding; the second stepped portion 682 has a second stepped surface facing the second valve body 613, and the second valve body 613 is fixedly sleeved on the second stepped portion 682 and abuts against the second stepped surface. Specifically, the two are also fixed by welding. In addition, in actual installation, the second valve body 613 can also be fixedly sleeved on the second stepped portion 682.

[0189] The first step portion 681 has a certain length in the axial direction so that the first valve body 612 and the adapter 68 have a certain mating length. The second step portion 682 also has a certain length in the axial direction so that the second valve body 613 and the adapter 68 also have a certain mating length, so as to ensure the stability and reliability of fixing the adapter 68 to the first valve body 612 and the second valve body 613.

[0190] In this embodiment, the first step portion 681 forms the aforementioned stop portion on its end face facing the first end cover 614, such as... Figure 14As shown, when the slider 65 is in the second position, it abuts against the end face of the first step portion 681.

[0191] The isolating part 651 of the sliding member 65 is specifically a piston bowl, the opening of which faces the first end cover 614. Under normal operating conditions, the pressure in the first cavity 611a is higher than that in the second cavity 611b, or is consistent with that in the second cavity 611b. The piston bowl has a one-way sealing structure, so setting a piston bowl with its opening facing the first cavity 611a is sufficient to meet the sealing requirements.

[0192] The slider 65 also includes a connecting part 652 and a limiting part 653. The two ends of the connecting part 652 are fixedly connected to the limiting part 653 and the isolation part 651. When the connecting rod assembly 64 abuts against the slider 65, it abuts against the limiting part 653.

[0193] Alternatively, the first valve body 612 and the second valve body 613 can also be integrally formed.

[0194] Please refer to Figures 16 to 18 The E, S, and C ports of valve seat 62 are arranged in sequence, with the S port located between the E and C ports. Of course, the arrangement of the E, S, and C ports is not limited.

[0195] Figure 16 As shown, the slider 63 is in the first working position, and the first projection formed by the inner cavity 631 of the slider on the upper surface of the valve seat 62 covers the E interface and the S interface, so that the E interface and the S interface are connected through the inner cavity 631 of the slider, and the C interface and the D interface are connected through the valve cavity 611.

[0196] Figure 17 As shown, slider 63 is in the second working position, and slider inner cavity 631 forms a first projection covering S interface and C interface on the upper surface of valve seat 62, so that S interface and C interface are connected through slider inner cavity 631, and E interface and D interface are connected through valve cavity 611.

[0197] Figure 18 As shown, slider 63 is in the third working position. The inner cavity 631 of slider forms a first projection covering interface S on the upper surface of valve seat 62, and the shielding part 632 forms a second projection covering interface E on the upper surface of valve seat 62, so that interface S and interface E are not connected, and they each form a separate flow channel. Interface C and interface D are connected through valve cavity 611. When slider 63 is in the third working position, the second projection may partially cover interface C, or may not cover interface C, as long as interface C and interface D are connected through valve cavity 611.

[0198] In conjunction with the defrosting mode of the aforementioned refrigeration system, a separate flow channel is formed through the S interface and the E interface, which adds a loop between the S interface and the throttling element 4, or a loop is connected in parallel with the indoor heat exchanger 2. This allows the indoor heat exchanger 2 to seal the high-temperature and high-pressure refrigerant when the outdoor unit heat exchanger defrosts in winter, ensuring that the indoor heat exchanger 2 remains in heating mode during the defrosting process.

[0199] Specifically, the E, S, and C interfaces have the same diameter, and the distance between the E and S interfaces is the same as the distance between the S and C interfaces. Along the axial direction of the solenoid switching valve 6, the size of the first projection is equal to the sum of the adjacent diameters and their distances. That is, the size of the first projection is equal to the sum of the diameter of the E interface, the diameter of the S interface, and the distance between them (first working position), and the size of the first projection is equal to the sum of the diameter of the S interface, the diameter of the C interface, and the distance between them (second working position). Furthermore, the size of the first projection is smaller than the diameter of the S interface and the sum of its distances from the E and C interfaces.

[0200] The shielding part 632 is located on the side of the inner cavity 631 of the slider close to the slider 65. Along the axial direction of the electromagnetic switching valve 6, the size of the second projection is larger than the size of the spacing and smaller than the sum of the spacing size and the diameter of the E interface. When the slider 63 is in the second working position, the shielding part 632 does not completely shield the E interface, ensuring that the E interface can communicate with the D interface through the valve cavity 611.

[0201] Alternatively, the axial direction of the electromagnetic switching valve 6, the size of the second projection and the size of the spacing are the same, so that the slider 63 is in the second working position and the shielding part 632 does not shield the E interface, ensuring that the E interface can communicate with the D interface through the valve cavity 611.

[0202] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A refrigeration system, characterized in that, The refrigeration system includes: An electromagnetic switching valve includes a valve body, a valve seat, and a slider. The valve body has a valve cavity and a D-port, and the valve cavity is connected to the D-port. The valve seat is located in the valve cavity and has an E-port, an S-port, and a C-port. The slider can slide along the valve seat, so that the electromagnetic switching valve has three working positions. The slider has a slider cavity and a blocking part. The slider cavity has a first projection on the plane where the upper surface of the valve seat is located, and the blocking part has a second projection on the plane where the upper surface of the valve seat is located. In the first working position, the first projection covers the E interface and the S interface, the inner cavity of the slider is connected to the E interface and the S interface, and the valve cavity is connected to the C interface and the D interface; In the second working position, the first projection covers the S interface and the C interface, the inner cavity of the slider is connected to the S interface and the C interface, and the valve cavity is connected to the E interface and the D interface; In the third working position, the first projection covers the S interface, the second projection covers the E interface, the S interface and the E interface are not connected, the S interface and the E interface respectively form separate flow channels, and the valve cavity is connected to the C interface and the D interface; The compressor has its outlet connected to the D port of the electromagnetic switching valve and its inlet connected to the S port of the electromagnetic switching valve. A three-way valve, wherein the three-way valve has an X port, a Y port and a Z port; An outdoor heat exchanger, one end of which is connected to the C port of the electromagnetic switching valve, and the other end of which is connected to the Y port of the three-way valve; An indoor heat exchanger, one end of which is connected to the E port of the electromagnetic switching valve, and the other end of which is connected to the X port of the three-way valve. In the first operating position, the Z port of the three-way valve is cut off, and the refrigerant flow path is: the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the Y port of the three-way valve, the X port of the three-way valve, the indoor heat exchanger, the E port of the electromagnetic switching valve, the S port of the electromagnetic switching valve, and the compressor inlet. In the second operating position, the Z port of the three-way valve is cut off, and the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the E port of the electromagnetic switching valve, the indoor heat exchanger, the X port of the three-way valve, the Y port of the three-way valve, the outdoor heat exchanger, the C port of the electromagnetic switching valve, the S port of the electromagnetic switching valve, and the compressor inlet. In the third working position, the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the Y port of the three-way valve, the Z port of the three-way valve, the S port of the electromagnetic switching valve, and the compressor inlet. In the third working position, the X port of the three-way valve and the E port of the electromagnetic switching valve are disconnected to seal the refrigerant of the indoor heat exchanger.

2. The refrigeration system according to claim 1, characterized in that, There is a gap between the E interface and the S interface, and between the S interface and the C interface; Along the axial direction of the electromagnetic switching valve, the size of the second projection is greater than the size of the spacing, but less than the sum of the spacing size and the diameter of the E interface.

3. The electromagnetic switching valve according to claim 1, characterized in that, There is a gap between the E interface and the S interface, and between the S interface and the C interface; Along the axial direction of the electromagnetic switching valve, the size of the second projection is the same as the size of the spacing.

4. The electromagnetic switching valve according to claim 1, characterized in that, The electromagnetic switching valve further includes a first pilot valve component, a second pilot valve component, and a sliding component; The slider is located in the valve cavity and is able to slide within the valve cavity to approach or move away from the valve seat; The valve chamber includes a first chamber, a second chamber, and a third chamber. The first pilot valve component and the second pilot valve component can change the pressure difference between the second chamber and the third chamber, as well as the pressure difference between the first chamber and the second chamber, to switch the sliding direction of the slider and the sliding direction of the slide block, so that the slide block switches between the first working position, the second working position, and the third working position.

5. The electromagnetic switching valve according to claim 4, characterized in that, The electromagnetic switching valve also includes a connecting rod assembly, which can drive the slider to slide along the valve seat; The valve body also includes a stop for limiting the sliding position of the sliding member. Under the pressure difference between the cavities at both ends of the sliding member, the sliding member can switch between two positions. The slider is in a first position, and the linkage assembly can abut against the slider so that the slider is in the first working position; The slider is in the second position, the slider abuts against the stop, and the linkage assembly can slide to the slider being in the second working position or the third working position, and the slider is in the second working position, and the linkage assembly abuts against the slider.

6. The electromagnetic switching valve according to claim 5, characterized in that, The connecting rod assembly includes a connecting rod and a first piston component and a second piston component fixed at both ends of the connecting rod; The valve chamber further includes a main valve chamber, which is formed between the first piston component and the second piston component. The D interface is connected to the main valve chamber, and the valve seat is located in the main valve chamber.

7. The electromagnetic switching valve according to claim 5, characterized in that, The valve body further includes a first valve body and a second valve body, the first valve body and the second valve body are fixedly connected to form the valve cavity, and the through diameter of the first valve body is larger than the through diameter of the second valve body; The valve body further includes a first end cap and a second end cap, the first end cap sealing one end of the first valve body, the stop portion being located at the other end of the first valve body, and the second end cap sealing one end of the second valve body. The sliding member is in the first position, and the sliding member abuts against the first end cap; The slider is in the third working position, and the connecting rod assembly abuts against the second end cap.

8. The electromagnetic switching valve according to claim 7, characterized in that, The first pilot valve component is in a de-energized state, the second pilot valve component is in a energized state, the pressure in the third chamber is greater than the pressure in the first chamber and the pressure in the second chamber, the sliding member slides to abut against the first end cover, and the connecting rod assembly slides to abut against the sliding member, so that the slider is in the first working position; The first pilot valve component is energized, the second pilot valve component is de-energized, the pressure in the first chamber and the pressure in the second chamber are greater than the pressure in the third chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the second end cover, so that the slider is in the second working position; The first pilot valve component is in a de-energized state, the second pilot valve component is in a de-energized state, the pressure in the first chamber and the pressure in the third chamber are greater than the pressure in the second chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the sliding member, so that the slider is in the third working position.

9. A refrigeration system, characterized in that, The refrigeration system includes: An electromagnetic switching valve includes a valve body, a valve seat, and a slider. The valve body has a valve cavity and a D-port, and the valve cavity is connected to the D-port. The valve seat is located in the valve cavity and has an E-port, an S-port, and a C-port. The slider can slide along the valve seat, so that the electromagnetic switching valve has three working positions. The slider has a slider cavity and a blocking part. The slider cavity has a first projection on the plane where the upper surface of the valve seat is located, and the blocking part has a second projection on the plane where the upper surface of the valve seat is located. In the first working position, the first projection covers the E interface and the S interface, the inner cavity of the slider is connected to the E interface and the S interface, and the valve cavity is connected to the C interface and the D interface; In the second working position, the first projection covers the S interface and the C interface, the inner cavity of the slider is connected to the S interface and the C interface, and the valve cavity is connected to the E interface and the D interface; In the third working position, the first projection covers the S interface, the second projection covers the E interface, the S interface and the E interface are not connected, the S interface and the E interface respectively form separate flow channels, and the valve cavity is connected to the C interface and the D interface; The compressor has its outlet connected to the D port of the electromagnetic switching valve and its inlet connected to the S port of the electromagnetic switching valve. A first solenoid valve, the first solenoid valve having port A and port B; A second solenoid valve, the second solenoid valve having an M port and an N port; An outdoor heat exchanger, one end of which is connected to the C port of the electromagnetic switching valve, and the other end of which is connected to the B port of the first electromagnetic valve or the N port of the second electromagnetic valve. An indoor heat exchanger, one end of which is connected to the E port of the electromagnetic switching valve, and the other end of which is connected to the A port of the first electromagnetic valve. In the first operating position, the M and N ports of the second solenoid valve are cut off, and the refrigerant flows through the compressor outlet, the D port of the solenoid switching valve, the C port of the solenoid switching valve, the outdoor heat exchanger, the B port of the first solenoid valve, the A port of the first solenoid valve, the indoor heat exchanger, the E port of the solenoid switching valve, the S port of the solenoid switching valve, and the compressor inlet. In the second operating position, the M and N ports of the second solenoid valve are cut off, and the refrigerant flows through the compressor outlet, the D port of the solenoid switching valve, the E port of the solenoid switching valve, the indoor heat exchanger, the A port of the first solenoid valve, the B port of the first solenoid valve, the indoor heat exchanger, the C port of the solenoid switching valve, the S port of the solenoid switching valve, and the compressor inlet. In the third working position, the refrigerant flows through the compressor outlet, the D port of the electromagnetic switching valve, the C port of the electromagnetic switching valve, the outdoor heat exchanger, the N port of the second electromagnetic valve, the M port of the second electromagnetic valve, the S port of the electromagnetic switching valve, and the compressor inlet. In the third working position, the A and B ports of the first solenoid valve and the E port of the solenoid switching valve are cut off to seal the refrigerant of the indoor heat exchanger.

10. The refrigeration system according to claim 9, characterized in that, There is a gap between the E interface and the S interface, and between the S interface and the C interface; Along the axial direction of the electromagnetic switching valve, the size of the second projection is greater than the size of the spacing, but less than the sum of the spacing size and the diameter of the E interface.

11. The refrigeration system according to claim 9, characterized in that, There is a gap between the E interface and the S interface, and between the S interface and the C interface; Along the axial direction of the electromagnetic switching valve, the size of the second projection is the same as the size of the spacing.

12. The refrigeration system according to claim 9, characterized in that, The electromagnetic switching valve further includes a first pilot valve component, a second pilot valve component, and a sliding component; The slider is located in the valve cavity and is able to slide within the valve cavity to approach or move away from the valve seat; The valve chamber includes a first chamber, a second chamber, and a third chamber. The first pilot valve component and the second pilot valve component can change the pressure difference between the second chamber and the third chamber, as well as the pressure difference between the first chamber and the second chamber, to switch the sliding direction of the slider and the sliding direction of the slide block, so that the slide block switches between the first working position, the second working position, and the third working position.

13. The refrigeration system according to claim 12, characterized in that, The electromagnetic switching valve also includes a connecting rod assembly, which can drive the slider to slide along the valve seat; The valve body also includes a stop for limiting the sliding position of the sliding member. Under the pressure difference between the cavities at both ends of the sliding member, the sliding member can switch between two positions. The slider is in a first position, and the linkage assembly can abut against the slider so that the slider is in the first working position; The slider is in the second position, the slider abuts against the stop, and the linkage assembly can slide to the slider being in the second working position or the third working position, and the slider is in the second working position, and the linkage assembly abuts against the slider.

14. The refrigeration system according to claim 13, characterized in that, The connecting rod assembly includes a connecting rod and a first piston component and a second piston component fixed at both ends of the connecting rod; The valve chamber further includes a main valve chamber, which is formed between the first piston component and the second piston component. The D interface is connected to the main valve chamber, and the valve seat is located in the main valve chamber.

15. The refrigeration system according to claim 13, characterized in that, The valve body further includes a first valve body and a second valve body, the first valve body and the second valve body are fixedly connected to form the valve cavity, and the through diameter of the first valve body is larger than the through diameter of the second valve body; The valve body further includes a first end cap and a second end cap, the first end cap sealing one end of the first valve body, the stop portion being located at the other end of the first valve body, and the second end cap sealing one end of the second valve body. The sliding member is in the first position, and the sliding member abuts against the first end cap; The slider is in the third working position, and the connecting rod assembly abuts against the second end cap.

16. The refrigeration system according to claim 15, characterized in that, The first pilot valve component is in a de-energized state, the second pilot valve component is in a energized state, the pressure in the third chamber is greater than the pressure in the first chamber and the pressure in the second chamber, the sliding member slides to abut against the first end cover, and the connecting rod assembly slides to abut against the sliding member, so that the slider is in the first working position; The first pilot valve component is energized, the second pilot valve component is de-energized, the pressure in the first chamber and the pressure in the second chamber are greater than the pressure in the third chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the second end cover, so that the slider is in the second working position; The first pilot valve component is in a de-energized state, the second pilot valve component is in a de-energized state, the pressure in the first chamber and the pressure in the third chamber are greater than the pressure in the second chamber, the sliding member abuts against the stop portion, and the connecting rod assembly slides to abut against the sliding member, so that the slider is in the third working position.

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