A new electromagnetic four-way reversing valve structure

Abstract

The present invention discloses a novel electromagnetic four-way reversing valve structure, comprising a pilot valve and a main valve. The pilot valve comprises a pilot valve core tube and a piston assembly. The left end of the pilot valve core tube is provided with an electromagnetic coil. The piston assembly is disposed in the inner cavity of the pilot valve core tube and elastically connected to the left end of the inner cavity of the pilot valve core tube via an elastic member. The surface of the piston assembly defines a piston outer cavity, which is axially penetrated by the piston inner cavity. The inner cavity of the pilot valve core tube is connected to D, C, S, and E capillaries. The main valve comprises a main valve body and a piston assembly. The piston assembly is disposed in the inner cavity of the main valve body. The surface of the piston assembly defines a piston outer cavity, which is axially penetrated by the piston inner cavity. The inner cavity of the main valve body is connected to D, C, S, and E pipes and end pipes 1 and 2. When the electromagnetic coil is de-energized, the air conditioner enters a refrigeration cycle. When the electromagnetic coil is energized, the air conditioner enters a heating cycle. This optimizes the electromagnetic four-way reversing valve structure and improves the cooling and heating effects of the air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of reversing valves, and in particular to a novel electromagnetic four-way reversing valve structure. Background Art

[0002] Solenoid four-way reversing valves are primarily used in heat pump air conditioners. They are categorized by structure into three types: RANCO, Pacific, and Saginomiya. Saginomiya-made solenoid four-way reversing valves offer greater reliability. Over the past two decades, the structure of solenoid four-way reversing valves has remained largely unchanged, and air conditioning manufacturers have largely relied on Saginomiya-made valves.

[0003] Heat pump type heating and cooling air conditioners are generally composed of compressor, evaporator, condenser, and electromagnetic four-way reversing valve. Figure 1 、 2 As shown in , 3 , the existing electromagnetic four-way reversing valve includes a pilot valve 10 ′, a main valve 20 ′, and an electromagnetic coil 30 ′. Among them, the pilot valve 10′ includes a pilot valve core tube 101′, a pilot slide valve 102′, a pilot valve seat 103′, an attractor 104′, a valve core 105′, and a compression spring 106′. The pilot valve seat 103′ is installed on the inner wall of the pilot valve core tube 101′ and corresponds to the D, C, S, and E capillaries connected to the pilot valve core tube 101′. The pilot slide valve 102′ covers the through hole of the pilot valve seat 103′; the attractor 104′ is arranged on the inner wall of the left end of the pilot valve core tube 101′, the valve core 105′ is arranged in the pilot valve core tube 101′ and is connected to the attractor 104′ through the compression spring 106′, the left end of the pilot slide valve 102′ is connected to the valve core 105′ through a connecting rod 107′, and the electromagnetic coil 30′ is sleeved on the outer wall of the pilot valve core tube 101′ at one end where the attractor 104′ is arranged.

[0004] The main valve 20′ includes a main valve body 201′, a main sliding valve 202′, a main valve seat 203′, and a piston head 204′. The main valve seat 203′ is installed on the inner wall of the main valve body 201′ and corresponds to the D, C, S, and E connecting pipes connected to the main valve body 201′. The main sliding valve 202′ is configured to be bowl-shaped and covers the through hole of the main valve seat 203′. The main sliding valve 202′ is also connected to the piston head 204′ through a bracket seat 205′.

[0005] In this way, Figure 2As shown, when the electromagnetic coil 30' is in the de-energized state, the pilot slide valve 102' moves rightward on the pilot slide seat 103' under the elastic force of the compression spring 106'; at this time, the pilot slide valve 102' covers the E and S capillaries, connecting the E and S capillaries, and connecting the D and C capillaries. The high-pressure refrigerant flows out from the compressor outlet, flows through the D pipe to the D capillary and enters the pilot valve core tube 101' through the D capillary, and then enters the left end of the main valve body 201' through the C capillary, so that the left end of the main valve body 201' forms the high-pressure side. The main valve body 201' The right end of the main valve body 201′ is the low-pressure side; in addition, the pilot slide valve 102′ moves right on the pilot valve seat 103′, and the S capillary tube is also connected to the S pipe, which is connected to the inlet of the compressor; due to the pressure difference between the two ends of the main valve body 201′, the main slide valve 202′ and the piston head 204′ move right synchronously in the main valve body 201′, so that the D and C pipes are connected, and the E and S pipes are connected; the high-pressure refrigerant of the compressor flows to the outdoor unit through the D and C pipes, and then flows from the outdoor unit into the indoor unit, and then flows back to the compressor through the E and S pipes, thereby forming a refrigeration cycle.

[0006] like Figure 3 As shown, when the electromagnetic coil 30' is in the energized state, the electromagnetic coil 30' generates electromagnetic force, causing the attractor 104' to generate magnetism. Under the magnetic attraction of the attractor 104', the valve core 105' overcomes the elastic force of the compression spring 106' and moves leftward in the pilot valve core tube 101'. The valve core 105' drives the pilot slide valve 102' to move leftward on the pilot valve seat 103' through the connecting rod 107'. At this time, the pilot slide valve 102' covers the C and S capillaries, connecting the C and S capillaries, and connecting the D and E capillaries. The high-pressure refrigerant flows out from the compressor outlet, flows to the D capillary through the D pipe, and enters the pilot valve core tube 101' through the D capillary, and then passes through the E The capillary tube enters the right end of the main valve body 201′, so that the right end of the main valve body 201′ forms a high-pressure side, and the left end of the main valve body 201′ is a low-pressure side; in addition, the pilot slide valve 102′ moves left on the pilot valve seat 103′, and the S capillary tube is also connected to the S pipe, and the S pipe is connected to the inlet of the compressor; due to the pressure difference between the two ends of the main valve body 201′, the main slide valve 202′ and the piston head 204′ move left synchronously in the main valve body 201′, so that the D and E pipes are connected, and the C and S pipes are connected; the high-pressure refrigerant of the compressor flows to the indoor unit through the D and E pipes, and then flows from the indoor unit into the outdoor unit, and then flows back to the compressor through the C and S pipes, thereby forming a heating cycle.

[0007] However, in the process of implementing the existing technical solution, the applicant discovered that the above technology has at least the following technical problems:

[0008] 1) The pilot valve 10′ of the electromagnetic four-way reversing valve on the existing market changes the communication relationship between the D, C, S, and E capillaries by sliding the pilot slide valve 102′ and the pilot valve seat 103′ relative to each other. The main valve 20′ changes the communication relationship between the D, C, S, and E pipes by sliding the main slide valve 202′ and the main valve seat 203′ relative to each other. Then, the cooling and heating cycles of the heat pump type heating and cooling air conditioner are realized through the coordinated connection between the pilot valve 10′ and the main valve 20′. However, the pilot slide valve 102′, the pilot valve seat 103′, the main slide valve 202′, and the main valve seat 203′ all need to be independently processed and require high processing precision. Therefore, the processing difficulty and processing cost of the electromagnetic four-way reversing valve are relatively high.

[0009] 2) The main slide valve 202' used in the main valve 20' is made of nylon material. Therefore, the main slide valve 202' is easily affected by the temperature and humidity of the operating environment and deformed. The main valve seat 203' is also prone to uneven processing, which in turn affects the sealing between the main slide valve 202' and the main valve seat 203', resulting in increased internal leakage of the main valve and reduced cooling and heating effects of the heat pump type air conditioner;

[0010] 3) When assembling the main valve seat 203' of the main valve 20', in order to ensure the flatness of the main valve seat 203', a higher machining accuracy requirement is required for the roundness and straightness of the inner cavity of the main valve body 201'. Therefore, the machining difficulty and cost of the main valve body 201' are increased.

[0011] 4) Since the main slide valve 202' of the Saginomiya company is designed in a bowl shape, the inner cavity of the main slide valve 202' is curved. During cooling and heating operations, the refrigerant flows through the curved inner cavity of the main slide valve 202', which affects the refrigerant flow coefficient of the electromagnetic four-way reversing valve;

[0012] 5) The D-connecting pipe of the main valve 20′ is arranged on one side of the main valve body 201′, and the C, S, and E-connecting pipes are arranged on the other side of the main valve body 201′. Therefore, in order to make the orientation of the D-connecting pipe consistent with that of the C, S, and E-connecting pipes, the D-connecting pipe needs to be bent, thereby increasing the processing difficulty and processing cost of the D-connecting pipe. Summary of the Invention

[0013] In view of this, the embodiment of the present application provides a new electromagnetic four-way reversing valve structure, which solves the technical problems of the electromagnetic four-way reversing valve in the prior art, such as the difficulty in processing, high processing cost, and increased internal leakage of refrigerant in the main valve.

[0014] The embodiment of the present application provides a novel electromagnetic four-way reversing valve structure, comprising:

[0015] The pilot valve comprises a pilot valve core tube and a piston assembly. The left end of the pilot valve core tube is provided with an electromagnetic coil. The piston assembly is arranged in the inner cavity of the pilot valve core tube and is elastically connected to the inner cavity end of the pilot valve core tube through an elastic member.

[0016] A piston outer cavity is formed on the surface of the piston assembly, and a piston inner cavity is formed along the axial direction of the piston assembly. The inner cavity of the pilot valve core tube is connected to the D, C, S, and E capillaries.

[0017] The main valve comprises a main valve body and a second piston assembly. The second piston assembly is disposed in the inner cavity of the main valve body. A second piston outer cavity is formed on the surface of the second piston assembly. A second piston inner cavity is axially penetrated along the second piston assembly. The inner cavity of the main valve body is connected to the D, C, S, and E pipes and the first and second end pipes.

[0018] The piston assembly 1 slides back and forth along the length direction of the inner cavity of the pilot valve core tube under the action of electromagnetic force or the elastic force of the elastic member, so that the S capillary tube and the E capillary tube are connected through the piston outer cavity 1 on the piston assembly 1, and the D capillary tube and the C capillary tube are connected through the inner cavity of the pilot valve core tube, or the S capillary tube and the C capillary tube are connected through the piston outer cavity 1 on the piston assembly 1, and the D capillary tube and the E capillary tube are connected through the piston inner cavity 1 on the piston assembly 1;

[0019] After the D capillary is connected to the C capillary or the D capillary is connected to the E capillary, the piston assembly 2 moves back and forth along the length direction of the inner cavity of the main valve body under the action of the introduced high-pressure refrigerant, so that the D pipe and the C pipe are connected through the inner cavity of the main valve body, and the S pipe and the E pipe are connected through the second outer cavity of the piston, or the D pipe and the E pipe are connected through the second inner cavity of the piston, and the S pipe and the C pipe are connected through the second outer cavity of the piston.

[0020] Furthermore, the second piston assembly includes a piston body, a first piston head, and a second piston head. The first piston head and the second piston head are integrally formed at both ends of the piston body, or the first piston head and the second piston head are fixedly connected to both ends of the piston body through a second connecting rod.

[0021] The second piston outer cavity is provided on the surface of the piston body, and the second piston inner cavity penetrates the piston body axially; the piston body, the first piston head, and the second piston head slide back and forth along the length direction of the inner cavity of the main valve body.

[0022] Furthermore, the piston body is provided with at least one piston inner cavity 2 in the axial direction, and two connecting rods 2 are provided, and the two connecting rods 2 are symmetrically arranged with the piston inner cavity 2 as the center.

[0023] Furthermore, the piston outer cavity is arranged along the circumference of the piston assembly.

[0024] Furthermore, the second piston outer cavity is arranged along the circumference of the piston assembly.

[0025] Furthermore, the D, C, S, and E capillaries are arranged along the surface of the pilot valve core tube and in sequence from the left end to the right end of the pilot valve core tube, and are arranged on the same side of the surface of the pilot valve core tube.

[0026] Furthermore, the D, C, S, and E connecting pipes are arranged along the surface of the main valve body and in sequence from the left end to the right end of the main valve body, and are arranged on the same side of the surface of the main valve body.

[0027] Furthermore, an attractor is provided on the inner wall of the left end of the pilot valve core tube, the attractor is connected to the valve core through the elastic member, and the valve core is fixedly connected to the piston assembly one through a connecting rod one.

[0028] Furthermore, the piston assembly 1 axially passes through more than one piston inner cavity 1, and the connecting rod 1 is connected to the end surface of the piston assembly 1 where the piston inner cavity 1 is opened.

[0029] Furthermore, the inner cavity of the pilot valve core tube and the inner cavity of the main valve body are both cylindrical holes, and the piston assembly 1 and the piston assembly 2 are both cylindrical;

[0030] The outer diameter of the piston assembly 1 is adapted to the inner diameter of the inner cavity of the pilot valve core tube, and the surface of the piston assembly 1 is in contact with the inner cavity of the pilot valve core tube;

[0031] The outer diameter of the second piston assembly is adapted to the inner diameter of the inner cavity of the main valve body, and the surface of the second piston assembly fits the inner cavity of the main valve body.

[0032] The novel electromagnetic four-way reversing valve structure provided in the embodiments of the present application has at least the following technical effects or advantages:

[0033] 1. Compared with the previous pilot valve with a pilot slide valve and a pilot valve seat, and the main valve with a main slide valve and a main valve seat, the pilot valve of the present application realizes the cooling and heating cycle of the heat pump type air conditioner. The pilot valve of the present application is equipped with a piston assembly in the inner cavity of the pilot valve core tube, and the piston assembly replaces the previous pilot valve seat and pilot slide valve. The piston assembly is provided with a piston outer cavity on the surface and a piston inner cavity axially extending therethrough, thereby cooperating with the D, C, S, and E capillary tubes connected to the pilot valve core tube to control the flow direction of the refrigerant in the D, C, S, and E capillary tubes. The structure of the pilot valve is optimized, and the processing accuracy requirements and processing costs of the pilot valve are reduced.

[0034] The main valve is assembled with a piston assembly 2 in the inner cavity of the main valve body, and the piston assembly 2 replaces the previous main valve seat and main sliding valve; the piston assembly 2 is provided with a piston outer cavity 2 on the surface and axially penetrated by a piston inner cavity 2, so as to cooperate with the D, C, S, and E pipes connected to the main valve body to control the flow direction of the refrigerant in the D, C, S, and E pipes; the structure of the main valve is optimized, and the processing accuracy requirements and processing costs of the main valve are reduced; the main sliding valve made of nylon material in the past is avoided, which is easily deformed by the temperature and humidity of the use environment, the main valve seat is unevenly processed, which affects the sealing performance of the main sliding valve and the main valve seat, increases the internal leakage of the main valve, and reduces the cooling and heating effects of the heat pump type air conditioner;

[0035] Compared with the previous main valve provided with a main sliding valve and a main valve seat, the main valve seat is installed in the main valve body cavity when the flatness of the main valve seat needs to be ensured; the piston assembly 2 used in the main valve of the embodiment of the present application has its own elastic and retractable characteristics. When it is assembled in the main valve body cavity, the processing requirements for the roundness and straightness of the main valve body cavity are relatively low. When the piston assembly 2 slides in the main valve body cavity, the piston assembly 2 still fits tightly to the main valve body cavity, and the sealing performance is better, and the processing difficulty and processing cost of the main valve body are reduced;

[0036] Compared with the previous implementation method in which the main sliding valve needs to be set in a bowl shape, the piston assembly 2 of the embodiment of the present application only needs to set a piston outer cavity 2 on the surface and a piston inner cavity 2 axially penetrating therethrough, so as to increase the refrigerant flow coefficient of the electromagnetic four-way reversing valve.

[0037] 2. Compared with the previous implementation method in which the main sliding valve is installed on a larger bracket seat and connected to the piston head through the bracket seat, so that the bracket seat and the piston head slide in the inner cavity of the main valve body and drive the main sliding valve to slide on the main valve seat, the piston assembly 2 of the main valve in the embodiment of the present application is simplified into an interconnected piston body, piston head 1, and piston head 2, and the piston body, piston head 1, and piston head 2 are all sealed and connected to the inner cavity of the main valve body; the main sliding valve and the main valve seat are replaced by the piston body, and the previous bracket seat is replaced by connecting rod 2, and the piston head 1 and piston head 2 are connected to the piston body through connecting rod 2; therefore, there is no need for the main sliding valve and main valve seat with high processing precision, and the bracket seat with large size and complex structure, which further reduces the processing difficulty and processing cost of the main valve.

[0038] 3. Compared to the conventional implementation of the main valve 20' where the D-connecting pipe is located on one side of the main valve body 201' and the C, S, and E-connecting pipes are located on the other side of the main valve body 201', the D, C, S, and E-connecting pipes of the main valve in this embodiment are sequentially arranged on the same side of the main valve body surface from the left end to the right end, making the piping structure design of the main valve more compact. At the same time, the bending process of the D-connecting pipe is eliminated, thereby reducing the manufacturing difficulty and cost of the main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of an electromagnetic four-way reversing valve in the prior art;

[0040] Figure 2 A schematic diagram of a heat pump type air conditioner in the prior art realizing a refrigeration cycle through an electromagnetic four-way reversing valve;

[0041] Figure 3 Schematic diagram of a heat pump type heating and cooling air conditioner in the prior art realizing a heating cycle through an electromagnetic four-way reversing valve;

[0042] Figure 4 This is a schematic diagram of the refrigeration cycle connection principle between the pilot valve and the main valve in the embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of the heating cycle connection principle between the pilot valve and the main valve in the embodiment of the present application;

[0044] Figure 6 This is a structural schematic diagram of the piston assembly of the pilot valve moving toward the right end of the inner cavity of the pilot valve core tube during the refrigeration cycle in the embodiment of the present application;

[0045] Figure 7 This is a front view of a piston assembly 1 of a pilot valve in an embodiment of the present application;

[0046] Figure 8 for Figure 7 AA direction cross-sectional view;

[0047] Figure 9 This is a structural schematic diagram of the piston assembly 2 of the main valve moving toward the right end of the inner cavity of the main valve body during the refrigeration cycle in the embodiment of the present application;

[0048] Figure 10 This is a front view of the piston body of the main valve in the embodiment of the present application;

[0049] Figure 11 for Figure 10 BB direction cross-sectional view;

[0050] Figure 12 This is a structural schematic diagram of the piston assembly of the pilot valve moving toward the left end of the inner cavity of the pilot valve core tube during the heating cycle in the embodiment of the present application;

[0051] Figure 13 This is a structural schematic diagram of the piston assembly 2 of the main valve moving toward the left end of the inner cavity of the main valve body during the heating cycle in an embodiment of the present application.

[0052] In the picture:

[0053] 10′, pilot valve; 101′, pilot valve core tube; 102′, pilot spool valve; 103′, pilot valve seat; 104′, attractor; 105′, valve core; 106′, compression spring; 107′, connecting rod;

[0054] 20′, main valve; 201′, main valve body; 202′, main slide valve; 203′, main valve seat; 204′, piston head; 205′, bracket seat;

[0055] 30′, electromagnetic coil;

[0056] 10. Pilot valve; 101. Pilot valve core tube; 102. Piston assembly 1; 1021. Piston outer chamber 1; 1022. Piston inner chamber 1; 103. Elastic member; 104. Valve core; 105. Connecting rod 1; 106. Attractor;

[0057] 20. Main valve; 201. Main valve body; 202. Piston assembly 2; 203. Piston body; 2031. Piston outer chamber 2; 2032. Piston inner chamber 2; 204. Piston head 1; 205. Piston head 2; 206. Connecting rod 2; 207. End pipe 1; 208. End pipe 2;

[0058] 30. Electromagnetic coil. DETAILED DESCRIPTION

[0059] In order to better understand the present technical solution, the present technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0060] like Figures 4 to 13 As shown, a new electromagnetic four-way reversing valve structure is provided for controlling the flow direction of the refrigerant to achieve cooling and heating operations of a heat pump type air conditioner. The new electromagnetic four-way reversing valve structure includes a pilot valve 10 and a main valve 20, wherein the pilot valve 10 has a pilot valve core tube 101 and a piston assembly 102. An electromagnetic coil 30 is sleeved on the left end surface of the pilot valve core tube 101. When the electromagnetic coil 30 is energized, a magnetic field is formed at the left end of the pilot valve core tube 101, generating an electromagnetic force. The piston assembly 102 is installed in the inner cavity of the pilot valve core tube 101. The piston assembly 102 has a certain elastic expansion function, so that the piston assembly 102 can fit tightly with the inner cavity of the pilot valve core tube 101. The piston assembly 102 can divide the inner cavity of the pilot valve core tube 101 into several sealed spaces. The piston assembly 102 is elastically connected to the left end of the inner cavity of the pilot valve core tube 101 through an elastic member 103. The elastic member 103 used is a compression spring or other elastic objects that can be plastically deformed.

[0061] Therefore, when the electromagnetic coil 30 is energized, an electromagnetic force is generated in the inner cavity of the pilot valve core tube 101. The electromagnetic force overcomes the elastic force of the elastic member 103 and the piston assembly 102 is driven to slide toward the left end of the pilot valve core tube 101. When the electromagnetic coil 30 is de-energized, the electromagnetic force on the left end of the inner cavity of the pilot valve core tube 101 is lost. Under the elastic force of the elastic member 103, the piston assembly 102 slides toward the right end of the pilot valve core tube 101. Therefore, the electromagnetic force generated by the electromagnetic coil 30 and the elastic force of the elastic member 103 cause the piston assembly 102 to move back and forth in the inner cavity of the pilot valve core tube 101.

[0062] Preferably, a piston outer cavity 1021 is formed around the surface of the piston assembly 102 to a certain depth. Of course, as long as the piston outer cavity 1021 on the piston assembly 102 can fit the capillary tube on the pilot valve core tube 101, the piston outer cavity 1021 can also be formed at any position on the surface of the piston assembly 102 to a certain depth. A piston inner cavity 1022 extends axially through the piston assembly 102, completely extending through both ends of the piston assembly 102. The piston inner cavity 1022 can be cylindrical or square, and its specific shape can be designed based on the shape of the pilot valve core tube 101.

[0063] The capillaries connected to the surface of the pilot valve core tube 101 are connected to its inner cavity. The capillaries connected to the surface of the pilot valve core tube 101 include D, C, S, and E capillaries to facilitate the connection between the pilot valve core tube 101 and the main valve 20, compressor, indoor unit, and outdoor unit.

[0064] When piston assembly 102 is installed in the inner cavity of pilot valve core tube 101, piston outer cavity 1021 of piston assembly 102 corresponds to capillary tubes D, C, S, and E. Furthermore, as piston assembly 102 reciprocates within the inner cavity of pilot valve core tube 101, the connection or cutoff relationship between capillary tubes D, C, S, and E is changed through piston outer cavity 1021 and piston inner cavity 1022, thereby controlling the flow direction of the refrigerant.

[0065] For example, under the action of electromagnetic force or the elastic force of the elastic member 103, the piston assembly 102 slides back and forth along the length direction of the inner cavity of the pilot valve core tube 101, so that the S capillary and the E capillary are connected through the piston outer cavity 1021 on the piston assembly 102, and the D capillary and the C capillary are connected through the inner cavity of the pilot valve core tube 101; or, the S capillary and the C capillary are connected through the piston outer cavity 1021 on the piston assembly 102, and the D capillary and the E capillary are connected through the piston inner cavity 1022 on the piston assembly 102.

[0066] The main valve 20 comprises a main valve body 201 and a second piston assembly 202. The second piston assembly 202 is mounted within the inner cavity of the main valve body 201. Preferably, a second piston outer cavity 2031 of a certain depth is formed around the surface of the second piston assembly 202. However, as long as the second piston outer cavity 2031 on the second piston assembly 202 can fit within the connecting pipe on the main valve body 201, the second piston outer cavity 2031 may be formed within the inner cavity 2031 at any position on the surface of the second piston assembly 202. A second piston inner cavity 2032 extends axially through the second piston assembly 202, completely extending through both ends of the second piston assembly 202. The second piston inner cavity 2032 can be cylindrical or square, and its specific shape can be designed based on the shape of the inner cavity of the main valve body 201.

[0067] The connecting pipes connected to the surface of the main valve body 201 are connected to its inner cavity. The connecting pipes connected to the surface of the main valve body 201 include D, C, S, and E connecting pipes. An end pipe 1 207 connected to the inner cavity of the main valve body 201 is provided at the left end of the main valve body 201, and an end pipe 208 connected to the inner cavity of the main valve body 201 is provided at the right end of the main valve body 201, so as to facilitate the connection between the inner cavity of the main valve body 201 and the pilot valve 10, the indoor unit, the outdoor unit, and the compressor.

[0068] When the piston assembly 202 is installed in the inner cavity of the main valve body 201, the piston outer cavity 2031 of the piston assembly 202 is set corresponding to the D, C, S, and E pipes, and moves back and forth in the inner cavity of the main valve body 201 with the piston assembly 202. The connection or cut-off relationship between the D, C, S, and E pipes can be changed through the piston outer cavity 2031 and the piston inner cavity 2032, thereby controlling the flow direction of the refrigerant.

[0069] For example, after the D capillary is connected to the C capillary or the D capillary is connected to the E capillary, the piston assembly 202 moves back and forth along the length direction of the inner cavity of the main valve body 201 under the action of the high-pressure refrigerant introduced, so that the D pipe and the C pipe are connected through the inner cavity of the main valve body 201, and the S pipe and the E pipe are connected through the piston outer cavity 2031; or, the D pipe and the E pipe are connected through the piston inner cavity 2032, and the S pipe and the C pipe are connected through the piston outer cavity 2031.

[0070] More specifically, taking the example of using electromagnetic four-way reversing valve to control the refrigerant flow direction of heat pump type cooling and heating air conditioner to perform cooling work, combined with the attached Figure 4 、 6 As shown in FIG. 9 , the refrigeration cycle of the embodiment of the present application works as follows:

[0071] When the electromagnetic coil 30 is de-energized, it generates no electromagnetic force. The piston assembly 102 of the pilot valve 10 slides toward the right end of the pilot valve core tube 101 under the elastic force of the elastic member 103, leaving space at the left end of the pilot valve core tube 101. This allows capillary tube D to communicate with capillary tube C through the space at the left end of the pilot valve core tube 101. Capillary tube S communicates with capillary tube E through outer piston chamber 1021 defined on the surface of piston assembly 102. Capillary tube S then communicates with connecting pipe S, which is connected to the compressor inlet. The high-pressure refrigerant flowing out of the compressor outlet flows through the D pipe and into the D capillary tube. From there, it flows into the left end of the pilot valve core tube 101. The high-pressure refrigerant in the pilot valve core tube 101 then flows through the C capillary tube and end tube 1 207 in sequence into the left end of the main valve body 201. This creates a high-pressure side at the left end of the main valve body 201, while the right end of the main valve body 201 becomes the low-pressure side. Due to the pressure difference between the two ends of the main valve body 201, piston assembly 2 202 slides toward the right end of the main valve body 201 under the push of the high-pressure refrigerant.

[0072] The high-pressure refrigerant from the compressor then flows through pipe D, the left end of the inner cavity of main valve body 201, and pipe C to the outdoor heat exchanger of the outdoor unit for heat exchange, causing the outdoor unit to release heat outdoors. The high-pressure refrigerant from the outdoor unit then flows into the indoor heat exchanger of the indoor unit for heat exchange, causing the indoor unit to absorb heat indoors. The low-pressure refrigerant discharged from the indoor unit after heat exchange then flows through pipe E, the piston outer cavity 2031 of piston assembly 202, and pipe S back to the compressor for further compression, thus completing the refrigeration cycle of the heat pump air conditioner.

[0073] More specifically, taking the example of using electromagnetic four-way reversing valve to control the refrigerant flow direction of heat pump type heating and cooling air conditioner for heating, combined with the attached Figure 5 、 12 As shown in FIG. 13 , the heating cycle of the embodiment of the present application works as follows:

[0074] When the electromagnetic coil 30 is in the energized state, the electromagnetic coil 30 generates electromagnetic force, and the piston assembly 102 of the pilot valve 10 overcomes the elastic force of the elastic member 103 under the action of the electromagnetic force and slides toward the left end of the inner cavity of the pilot valve core tube 101, leaving space at the right end of the inner cavity of the pilot valve core tube 101.

[0075] At this point, capillary tube D connects to capillary tube E through the space left in piston inner cavity 1022 of piston assembly 102 and the right end of the pilot valve core tube 101. Capillary tube C connects to capillary tube S through piston outer cavity 1021 of piston assembly 102. Capillary tube S connects to pipe S, which is connected to the compressor inlet. High-pressure refrigerant flowing out of the compressor outlet flows through pipe D into capillary tube D, then from capillary tube D into the pilot valve core tube 101, through piston inner cavity 1022 to capillary tube E, and then through capillary tube E and end tube 2 208 into the right end of the main valve body 201. This forms the high-pressure side of the main valve body 201's inner cavity, while the left end of the main valve body 201's inner cavity becomes the low-pressure side. Due to the pressure difference between the two ends of the inner cavity of the main valve body 201 , the second piston assembly 202 slides toward the left end of the inner cavity of the main valve body 201 under the push of the high-pressure refrigerant.

[0076] The high-pressure refrigerant from the compressor then flows through pipe D, piston cavity 2032, and pipe E, entering the indoor heat exchanger of the indoor unit for heat exchange, causing the indoor unit to release heat indoors. The high-pressure refrigerant then flows from the indoor unit to the outdoor heat exchanger of the outdoor unit for heat exchange, causing the outdoor unit to absorb heat outdoors. The low-pressure refrigerant discharged from the outdoor unit then flows through pipe C, piston cavity 2031, and pipe S, returning to the compressor for further compression, completing the heating cycle of the heat pump air conditioner.

[0077] In practical applications, the pilot valve 10 provided in the embodiment of the present application can be used in conjunction with a conventional main valve 20 manufactured by a Japanese company called Saginomiya to form a new electromagnetic four-way reversing valve. Of course, the main valve 20 provided in the embodiment of the present application can also be used in conjunction with a conventional pilot valve 10 manufactured by a Japanese company called Saginomiya to form a new electromagnetic four-way reversing valve. Both of these electromagnetic four-way reversing valve combinations can achieve the basic refrigerant flow control function of heat pump-type heating and cooling air conditioners.

[0078] Furthermore, in the application of heat pump type heating and cooling air conditioning systems with special requirements, the positions of the D pipe and the S pipe connected to the main valve body 201 of the embodiment of the present application can be interchanged, and the positions of the E pipe and the C pipe can also be interchanged, and the working principle of the electromagnetic four-way reversing valve can be ensured to remain unchanged.

[0079] The novel electromagnetic four-way reversing valve structure provided in the embodiments of the present application has at least the following technical effects or advantages:

[0080] Compared with the previous pilot valve 10 provided with a pilot slide valve and a pilot valve seat, and the main valve provided with a main slide valve and a main valve seat, the pilot valve 10 of the present application realizes the cooling and heating cycle of the heat pump type air conditioner. The pilot valve 10 of the present application is provided with a piston assembly 102 in the inner cavity of the pilot valve core tube 101, and the piston assembly 102 replaces the previous pilot valve seat and pilot slide valve. The piston assembly 102 is provided with a piston outer cavity 1021 on the surface and a piston inner cavity 1022 axially extending therethrough, thereby cooperating with the D, C, S, and E capillaries connected to the pilot valve core tube 101 to control the flow direction of the refrigerant in the D, C, S, and E capillaries. The structure of the pilot valve 10 is optimized, and the processing accuracy requirements and processing costs of the pilot valve 10 are reduced.

[0081] The main valve 20 is assembled with a piston assembly 202 in the inner cavity of the main valve body 201, and the piston assembly 202 replaces the previous main valve seat and main sliding valve; the piston assembly 202 is provided with a piston outer cavity 2031 on the surface and a piston inner cavity 2032 axially passing through, so as to cooperate with the D, C, S, and E connecting pipes connected to the main valve body 201 to control the flow direction of the refrigerant in the D, C, S, and E connecting pipes; the structure of the main valve 20 is optimized, and the processing accuracy requirements and processing costs of the main valve 20 are reduced; it avoids the problem that the main sliding valve made of nylon material in the past is easily affected by the temperature and humidity of the use environment and deformed, the main valve seat is not processed smoothly, the sealing performance of the main sliding valve and the main valve seat is affected, the internal leakage of the main valve 20 is increased, and the cooling and heating effects of the heat pump type air conditioner are reduced.

[0082] Compared with the previous main valve that is provided with a main sliding valve and a main valve seat, when it is necessary to ensure the flatness of the main valve seat, the main valve seat is installed in the inner cavity of the main valve body 201; the piston assembly 202 used in the main valve 20 of the embodiment of the present application has its own elastic and telescopic characteristics. When it is assembled in the inner cavity of the main valve body 201, the processing requirements for the roundness and straightness of the inner cavity of the main valve body 201 are relatively low. When the piston assembly 202 slides in the inner cavity of the main valve body 201, the piston assembly 202 still fits tightly to the inner cavity of the main valve body 201, and has better sealing performance, and also reduces the processing difficulty and processing cost of the main valve body 201.

[0083] Compared with the previous implementation method in which the main sliding valve needs to be set in a bowl shape, the piston assembly 202 of the embodiment of the present application only needs to set a piston outer cavity 2031 on the surface and an axially penetrating piston inner cavity 2032 to increase the refrigerant flow coefficient of the electromagnetic four-way reversing valve.

[0084] like Figure 6 、 7As shown in Figures 8 and 9, the inner cavity of the pilot valve core tube 101 is configured as a cylindrical hole, and the piston assembly 102 is configured as a cylindrical shape. The outer diameter of the piston assembly 102 is adapted to the inner diameter of the inner cavity of the pilot valve core tube 101. Therefore, the piston assembly 102 can be installed in the inner cavity of the pilot valve core tube 101, with the outer diameter of the piston assembly 102 fitting closely to the inner wall of the inner cavity of the pilot valve core tube 101. The piston assembly 102 can also reciprocate left and right within the inner cavity of the pilot valve core tube 101. This ensures that the piston assembly 102 can accurately adjust the connection relationship between the D, C, S, and E capillaries, thereby correspondingly connecting and disconnecting them.

[0085] The design requirements for the piston outer chamber 1021 of the piston assembly 102 on the pilot valve 10 are that the piston outer chamber 1021 is formed by a recessed portion of the piston assembly 102 surface toward the center, and is formed along the circumference of the piston assembly 102. The depth of the recessed portion of the piston outer chamber 1021 can be determined based on the diameter of the piston assembly 102. The size and angle of the piston outer chamber 1021 along the circumference of the piston assembly 102 surface can be adjusted based on the refrigerant flow coefficient.

[0086] The pipeline design requirements on the pilot valve core tube 101 are that the D, C, S, and E capillaries are arranged along the surface of the pilot valve core tube 101 and in sequence from the left end to the right end of the pilot valve core tube 101; after the D, C, S, and E capillaries are arranged on the surface of the pilot valve core tube 101, the D, C, S, and E capillaries are located on the same side of the pilot valve core tube 101.

[0087] Thus, compared to the previous implementation method in which the D capillary tube of the pilot valve 10 is arranged on one side of the surface of the pilot valve core tube 101 and the C, S, and E capillary tubes are arranged on the other side of the surface of the pilot valve core tube 101, in the embodiment of the present application, the D capillary tube and the C, S, and E capillary tubes of the pilot valve 10 are all arranged on the same side of the surface of the pilot valve core tube 101, thereby making the structural design of each pipe more compact and reducing the processing difficulty and cost of each pipe on the pilot valve 10.

[0088] According to the above technical solution, the piston assembly 102 is elastically connected to the left end of the inner cavity of the pilot valve core tube 101 via the elastic member 103. Specifically, an attractor 106 is provided at the left end of the inner cavity of the pilot valve core tube 101, and a valve core 104 that can slide left and right is provided in the inner cavity of the pilot valve core tube 101. The valve core 104 is elastically connected to the attractor 106 via the elastic member 103. The end of the valve core 104 away from the attractor 106 is fixedly connected to the piston assembly 102 via the connecting rod 105, thereby completing the elastic connection relationship between the piston assembly 102 and the left end of the inner cavity of the pilot valve core tube 101.

[0089] Thus, when the electromagnetic coil 30 is energized, it generates a magnetic field at the left end of the inner cavity of the pilot valve core tube 101. Based on the principle of electromagnetic induction, the attractor 106 generates an electromagnetic force, so that the valve core 104 is attracted by the electromagnetic force of the attractor 106. Furthermore, under the action of overcoming the elastic force of the elastic member 103, the valve core 104 drives the piston assembly 102 to slide toward the left end of the inner cavity of the pilot valve core tube 101 through the connecting rod 105. When the electromagnetic coil 30 is de-energized, the electromagnetic coil 30 does not generate a magnetic field. Therefore, the valve core 104 is acted upon by the elastic force of the elastic member 103 and pushes the piston assembly 102 to slide toward the right end of the inner cavity of the pilot valve core tube 101 through the connecting rod 105.

[0090] It should be noted that when piston assembly 102 moves left and right within the inner cavity of pilot valve core tube 101, the lengths of connecting rod 105 and piston assembly 102 are adjusted so that piston assembly 102 can be arranged correspondingly with capillaries D, C, S, and E. The required lengths of piston assembly 102 and connecting rod 105 are not limited herein and can be specifically set based on the shape of the inner cavity of pilot valve core tube 101.

[0091] In order to achieve a better refrigerant flow direction adjustment effect for the piston assembly 102, one, or more than two, axially penetrating piston inner cavities 1022 are provided in the piston assembly 102 to meet the flow coefficient of the refrigerant.

[0092] In addition, in order to ensure a stable connection between the piston assembly 102 and the valve core 104, several branches can be set at one end of the connecting rod 105 connected to the end face of the piston assembly 102, so that the connecting rod 105 is connected to the end face of the piston assembly 102, and the force applied to the piston assembly 102 through the connecting rod 105 is more uniform.

[0093] like Figure 9 、 10 As shown in Figures 11 and 2, the inner cavity of the main valve body 201 is designed as a cylindrical hole, and the second piston assembly 202 is designed as a cylindrical shape. The outer diameter of the second piston assembly 202 matches the inner diameter of the inner cavity of the main valve body 201. Therefore, the second piston assembly 202 can be installed in the inner cavity of the main valve body 201, with the outer diameter of the second piston assembly 202 fitting closely to the inner wall of the inner cavity of the main valve body 201. The second piston assembly 202 can also move back and forth within the inner cavity of the main valve body 201. This ensures that the second piston assembly 202 can accurately adjust the corresponding connection and disconnection between the D, C, S, and E pipes.

[0094] The structural design of the piston assembly 202 is further described. The piston assembly 202 includes a piston body 203, a piston head 1 204, and a piston head 2 205. The piston head 1 204 is connected to one end of the piston body 203 (the one end is the left end of the piston body 203) through a connecting rod 206, and the piston head 2 205 is connected to the other end of the piston body 203 away from the piston head 1 204 (the other end is the right end of the piston body 203) through a connecting rod 206, so that the piston body 203 forms a stable connection with the piston head 1 204 and the piston head 2 205.

[0095] When the piston body 203, piston head 1 204, and piston head 205 are installed within the inner cavity of the main valve body 201, the inner cavity of the main valve body 201 can be divided into multiple spaces. Therefore, according to the structural design of the second piston assembly 202, the surface of the piston body 203 is concave to form the second piston outer cavity 2031. It penetrates the piston body 203 axially to form the second piston inner cavity 2032, which also extends to both end surfaces of the piston body 203.

[0096] According to the structural connection relationship among the piston body 203 , the piston head 1 204 and the piston head 2 205 , the piston body 203 , the piston head 1 204 and the piston head 2 205 can slide back and forth along the length direction of the inner cavity of the main valve body 201 .

[0097] More specifically, after the piston body 203, piston head 1 204, and piston head 2 205 are synchronously moved toward the right end of the inner cavity of the main valve body 201 by the thrust of the high-pressure refrigerant, the D pipe is connected to the C pipe through the gap between the piston head 1 204 and the piston body 203, and the S pipe is connected to the E pipe through the piston outer cavity 2 2031.

[0098] After the piston body 203, piston head 1 204, and piston head 2 205 are synchronously moved toward the left end of the inner cavity of the main valve body 201 by the thrust of the high-pressure refrigerant, the D pipe is connected to the E pipe through the piston inner cavity 2032, and the C pipe is connected to the S pipe through the piston outer cavity 2031.

[0099] It should be noted that when the piston body 203, piston head 1 204, and piston head 2 205 move within the inner cavity of the main valve body 201, the lengths of the piston body 203, piston head 1 204, piston head 2 205, and connecting rod 2 206 are adjusted so that the piston body 203, piston head 1 204, and piston head 2 205 can be arranged correspondingly with the D, C, S, and E pipes. The required lengths of the piston body 203, piston head 1 204, piston head 205, and connecting rod 2 206 are not limited herein and can be specifically set with reference to the shape of the inner cavity of the main valve body 201.

[0100] In this way, compared with the previous implementation method in which the main slide valve is installed on a larger support seat and connected to the piston head through the support seat, so that the support seat and the piston head drive the main slide valve to slide on the main valve seat when the support seat and the piston head slide in the inner cavity of the main valve body 201, the piston assembly 2 202 of the main valve 20 in the embodiment of the present application is simplified to an interconnected piston body 203, a piston head 1 204, and a piston head 2 205, and the piston body 203, the piston head 1 204, and the piston head 2 205 are all sealed to the inner cavity of the main valve body 201; the main slide valve and the main valve seat are replaced by the piston body 203, and the previous support seat is replaced by the connecting rod 206, and the piston head 1 204 and the piston head 205 are connected to the piston body 203 through the connecting rod 206; therefore, there is no need for the main slide valve and the main valve seat with high processing precision, and the support seat with a large body and complex structure, which further reduces the processing difficulty and processing cost of the main valve 20.

[0101] In accordance with the design requirements for the second piston outer chamber 2031 of the piston body 203, the second piston outer chamber 2031 is specifically formed by a central recess of the piston body 203 surface to a certain depth and a circumferential opening along the surface of the piston body 203. The depth of the central recess of the second piston outer chamber 2031 can be determined based on the diameter of the piston body 203 itself, and the size and angle of the second piston outer chamber 2031 along the circumference of the piston body 203 can be adjusted based on the required refrigerant flow coefficient.

[0102] In order to achieve a better refrigerant flow direction adjustment effect for the piston body 203 , the piston body 203 is axially penetrated by one or more piston inner cavities 2032 to meet the refrigerant flow coefficient circulating in the piston body 203 .

[0103] In addition, in order to ensure a stable connection between the piston body 203 and the piston head 1 204 and the piston head 2 205, the piston body 203 and the piston head 1 204 and the piston head 2 205 are preferably fixedly connected to each other through two or more connecting rods 206, and the two connecting rods 206 are symmetrically arranged with the piston inner cavity 2032 as the center.

[0104] The pipeline design requirement on the main valve body 201 is to arrange the D, C, S, and E pipes in sequence along the surface of the main valve body 201 and from the left end to the right end of the main valve body 201, so that the D, C, S, and E pipes are arranged on the same side of the surface of the main valve body 201.

[0105] Thus, compared to the conventional implementation method in which the D pipe of the main valve is arranged on one side of the main valve body and the C, S, and E pipes are arranged on the other side of the main valve body, the D, C, S, and E pipes of the main valve 20 in the embodiment of the present application are arranged sequentially on the same side of the surface of the main valve body 201 from the left end to the right end of the main valve body 201, thereby making the pipeline structure design of the main valve 20 more compact, eliminating the processing step of bending the D pipe, reducing the processing difficulty of the main valve 20, and saving production and processing costs.

[0106] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A new electromagnetic four-way reversing valve structure, characterized in that: include: The pilot valve comprises a pilot valve core tube and a piston assembly. The left end of the pilot valve core tube is provided with an electromagnetic coil. The piston assembly is arranged in the inner cavity of the pilot valve core tube and is elastically connected to the inner cavity end of the pilot valve core tube through an elastic member. A piston outer cavity is formed on the surface of the piston assembly, and a piston inner cavity is formed along the axial direction of the piston assembly. The inner cavity of the pilot valve core tube is connected to the D, C, S, and E capillaries. The main valve comprises a main valve body and a second piston assembly. The inner cavity of the main valve body is configured as a cylindrical hole, and the second piston assembly is configured as a cylindrical shape. The second piston assembly is disposed in the inner cavity of the main valve body, and the outer diameter of the second piston assembly matches the inner diameter of the inner cavity of the main valve body. The surface of the second piston assembly is provided with a second piston outer cavity, and the second piston inner cavity axially penetrates the second piston assembly. The inner cavity of the main valve body is connected to D, C, S, and E pipes and end pipes 1 and 2. The second piston assembly includes a piston body, and the second piston outer cavity is provided on the surface of the piston body, and the second piston inner cavity axially penetrates the piston body. The piston assembly 1 slides back and forth along the length direction of the inner cavity of the pilot valve core tube under the action of electromagnetic force or the elastic force of the elastic member, so that the S capillary tube and the E capillary tube are connected through the piston outer cavity 1 on the piston assembly 1, and the D capillary tube and the C capillary tube are connected through the inner cavity of the pilot valve core tube, or the S capillary tube and the C capillary tube are connected through the piston outer cavity 1 on the piston assembly 1, and the D capillary tube and the E capillary tube are connected through the piston inner cavity 1 on the piston assembly 1; After the D capillary is connected to the C capillary or the D capillary is connected to the E capillary, the piston assembly 2 moves back and forth along the length direction of the inner cavity of the main valve body under the action of the introduced high-pressure refrigerant, so that the D pipe and the C pipe are connected through the inner cavity of the main valve body, and the S pipe and the E pipe are connected through the second outer cavity of the piston, or the D pipe and the E pipe are connected through the second inner cavity of the piston, and the S pipe and the C pipe are connected through the second outer cavity of the piston.

2. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: The second piston assembly includes a first piston head and a second piston head, wherein the first piston head and the second piston head are integrally formed at both ends of the piston body, or the first piston head and the second piston head are fixedly connected to both ends of the piston body through a second connecting rod; The piston body, the first piston head and the second piston head slide back and forth together along the length direction of the inner cavity of the main valve body.

3. The novel electromagnetic four-way reversing valve structure according to claim 2 is characterized in that: The piston body is provided with at least one piston inner cavity 2 in the axial direction, and two connecting rods 2 are provided, and the two connecting rods 2 are symmetrically arranged with the piston inner cavity 2 as the center.

4. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: The piston outer chamber is arranged along the circumference of the piston assembly.

5. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: The second piston outer cavity is arranged along the circumference of the piston assembly.

6. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: The D, C, S, and E capillaries are arranged along the surface of the pilot valve core tube and in sequence from the left end to the right end of the pilot valve core tube, and are arranged on the same side of the surface of the pilot valve core tube.

7. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: The D, C, S, and E connecting pipes are arranged along the surface of the main valve body and in sequence from the left end to the right end of the main valve body, and are arranged on the same side of the surface of the main valve body.

8. The novel electromagnetic four-way reversing valve structure according to claim 1 is characterized in that: An attractor is provided on the inner wall of the left end of the pilot valve core tube. The attractor is connected to the valve core through the elastic member. The valve core is fixedly connected to the piston assembly through a connecting rod.

9. The novel electromagnetic four-way reversing valve structure according to claim 8 is characterized in that: The piston assembly 1 axially passes through more than one piston inner cavity 1, and the connecting rod 1 is connected to the end surface of the piston assembly 1 where the piston inner cavity 1 is opened.

10. The novel electromagnetic four-way reversing valve structure according to any one of claims 1 to 9, characterized in that: The inner cavity of the pilot valve core tube and the inner cavity of the main valve body are both cylindrical holes, and the piston assembly 1 and the piston assembly 2 are both cylindrical; The outer diameter of the piston assembly 1 is adapted to the inner diameter of the inner cavity of the pilot valve core tube, and the surface of the piston assembly 1 is in contact with the inner cavity of the pilot valve core tube; The outer diameter of the second piston assembly is adapted to the inner diameter of the inner cavity of the main valve body, and the surface of the second piston assembly fits the inner cavity of the main valve body.

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