Four-way valve reversing method and linkage four-way valve

Abstract

The invention discloses a four-way valve reversing method and a linkage four-way valve, and belongs to the technical field of heating ventilation air conditioning system accessories. The method mainly comprises the steps that two relatively independent closed spaces are designed in a valve body of a main valve of the four-way valve, two relatively independent pressure balance air chambers are designed in one closed space, a control element is used for enabling the two pressure balance air chambers to form an air pressure difference, and the air pressure difference is used for pushing a rotating shaft to rotate; a reversing valve element is installed in the other closed space, and a ventilation pipe D, a ventilation pipe C, a ventilation pipe S and a ventilation pipe E which are communicated with the main valve body in a closed mode are arranged in the circumferential direction of the reversing valve element. The flow direction of a refrigerant is changed in a rotary linkage mode, so that efficient switching of an air conditioning system among different working modes is achieved, and the four-way valve is stable in performance, compact, small, small in occupied space, flexible to install and capable of being integrated to various heating ventilation air conditioning systems and has important significance in the technical field of four-way valves.

Description

Technical Field

[0001] The present invention belongs to the technical field of HVAC system accessories, and more specifically, particularly relates to a four-way valve reversing method with a unique and ingenious structural design, which utilizes a rotary linkage method to change the flow direction of a refrigerant, has a fast switching response speed, high switching accuracy, effectively isolates different gas paths through a simple and reasonable internal structure, has no traditional internal leakage, cross-flow, and slider "stuck" phenomena, has stable performance, high reliability, compact structural design, flexible installation, and can be integrated into various HVAC systems, and a linkage four-way valve using the method. Background Art

[0002] The four-way valve is a key component in the heating, ventilation and air conditioning (HVAC) system. It is mainly used to control the flow direction of refrigerant in heat pump systems, air conditioning systems and similar equipment with cooling and heating functions. The reversing of the four-way valve means that the air conditioning system and other systems can switch between different working modes by changing the flow direction of the refrigerant.

[0003] The four-way valve disclosed in the Chinese patent document with application publication number CN117090963A is a traditional four-way valve. The four-way valve consists of two parts, one is a pilot valve and the other is a main valve. The main valve is controlled by the pilot valve, and the two are connected by four guide capillaries. The pilot valve is specifically composed of a valve bowl, a spring, an iron core and an electromagnetic coil, and the pilot valve body is provided with four valve holes connected to the guide capillaries. The main valve consists of a main valve body and four vent pipes (D vent pipe, C vent pipe, E vent pipe, S vent pipe). Among them, the E vent pipe, the S vent pipe and the C vent pipe are on the same side, the S vent pipe is connected to the low-pressure air inlet pipe of the compressor, and the E vent pipe and the C vent pipe are connected to the indoor and outdoor heat exchangers; the D vent pipe is on the other side and is connected to the high-pressure air outlet pipe of the compressor. A semicircular slider and two pistons with small holes are provided in the main valve body. The slider acts as a valve and can move left and right on the inner valve seat in the main valve body, so that the two connecting pipes on the lower side are connected through the two valve holes covered by the slider, and the other connecting pipe on the lower side is connected to the main valve body through another valve hole. The piston and the slider are connected together through the valve frame and can move synchronously. When the refrigeration is running, the guide valve coil is not energized, and the thrust of the spring causes the iron core and the valve bowl to move to the left together. At this time, the D capillary is connected to the C capillary (high pressure), and the E capillary is connected to the S capillary (low pressure), thereby pushing the main valve slider to move to the left, and the E vent pipe of the four-way valve is connected to the S vent pipe, and the D vent pipe is connected to the C vent pipe. When the heating is running, the pilot valve coil is energized, the electromagnetic field attracts the armature to move right, the spring is compressed, and the iron core pulls the valve bowl to move right together, so that the E capillary is connected to the D capillary (high pressure), and the S capillary is connected to the C capillary (low pressure), thereby pushing the slider of the main valve to move to the right. At this time, the D vent pipe is connected to the E vent pipe, and the C vent pipe is connected to the S vent pipe.

[0004] However, the traditional main valve structure design is not reasonable. The E vent pipe, C vent pipe, and S vent pipe are in a row, and are connected by a slider that moves left and right on the inner valve seat to cover two of the valve holes. This structural design makes the tightness between the slider and the inner valve seat completely dependent on the high-pressure gas in the main valve. The pressure stability of the high-pressure gas directly affects the tightness between the slider and the inner valve seat. Therefore, in actual practical use, the traditional main valve is prone to the following faults: 1. Internal leakage: Since the tightness between the slider and the inner valve seat is affected by the stability of the high-pressure gas pressure, if the high-pressure gas pressure is unstable or insufficient, the slider will not fit tightly against the inner valve seat. This will cause internal leakage, which will lead to poor switching accuracy and slow switching speed of the four-way valve.

[0005] 2. Air cross-talk: In the design of the traditional main valve, the E vent pipe, C vent pipe and S vent pipe are arranged side by side, and two of the valve holes are covered by a slider that moves left and right on the inner valve seat to achieve communication. This design easily leads to air cross-talk between the high-pressure cavity, E vent pipe, C vent pipe and S vent pipe. Air cross-talk is another factor that causes poor switching accuracy and slow switching speed of the four-way valve.

[0006] 3. The phenomenon of "sliding block" of the slider: The cross-flow and internal leakage of the four-way valve will not only affect the switching efficiency of the system's hot and cold modes, but also may cause the pressure on both ends of the slider to be unbalanced, making it impossible to push the slider to change direction, thus causing the slider to "slide block". Once the slider is stuck, the entire system will not work properly and needs to be shut down for maintenance, which will have a great impact on the stable operation of the entire heating, ventilation and air conditioning (HVAC) system.

[0007] 4. The traditional main valve has a complex structure design, large size and occupies a large space. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies in the prior art and to provide a four-way valve reversing method with a unique and ingenious structural design, which utilizes a rotary linkage method to change the flow direction of the refrigerant, has a fast switching response speed, high switching accuracy, effectively isolates different gas paths through a simple and reasonable internal structure, is free of traditional internal leakage, air cross-talk, and slider "stuck" phenomena, has stable performance, high reliability, compact structural design, flexible installation, and can be integrated into various HVAC systems, as well as a linkage four-way valve using the method.

[0009] The present invention is achieved through the following technical solutions: A four-way valve reversing method, the method comprising: Two relatively independent closed spaces are designed inside the main valve body of the four-way valve; Two relatively independent pressure-balancing air chambers are designed in one of the confined spaces, and a control element is used to form a pressure difference between the two pressure-balancing air chambers, and the pressure difference is used to drive the rotating shaft that passes through the two confined spaces to rotate; A reversing valve core is installed in another closed space, and a D vent pipe, a C vent pipe, an S vent pipe, and an E vent pipe which are in closed communication with the main valve body are arranged along the circumferential direction of the reversing valve core; Two relatively independent valve core air chambers are designed on the reversing valve core. The rotation of the rotating shaft drives the reversing valve core to rotate, thereby changing the positions of the two valve core air chambers, so that the D ventilation pipe, C ventilation pipe / E ventilation pipe are connected to one of the valve core air chambers, and at the same time, the S ventilation pipe, E ventilation pipe / C ventilation pipe are connected to the other valve core air chamber.

[0010] A linkage four-way valve for a four-way valve reversing method, comprising a control element and a main valve, wherein the main valve comprises a main valve body of a closed structure; a rotating air chamber closed space and a valve core closed space are arranged inside the main valve body; The enclosed space of the rotating air chamber includes an air chamber partition chamber with a stroke opening and a hollow structure; the air chamber partition chamber is located between two air chamber partitions that are oppositely arranged and tightly connected to the inner wall of the main valve body, and the air chamber partition chamber and the two air chamber partitions are relatively stationary; a rotating shaft that penetrates the enclosed space of the rotating air chamber and extends to the enclosed space of the valve core is provided in the air chamber partition chamber, and a stroke limit block with limiting and sealing functions is fixedly installed on the rotating shaft; the stroke limit block can swing back and forth in the stroke opening, and in a natural state without external pressure interference, the stroke limit block is in the middle position of the stroke opening; a dividing fixed seal that is in tight contact with the rotating shaft is provided in the middle position of the air chamber partition chamber along the axial direction; the dividing fixed seal and the stroke limit block divide the space in the air chamber partition chamber into two independent pressure-balancing air chambers with pressure difference provided by a control element; A reversing valve core is arranged in the closed space of the valve core, and two symmetrical valve core air chambers are opened along the surface of the reversing valve core, and the valve core spine between the two valve core air chambers is tightly connected to the inner wall of the main valve body; when the stroke limit block contacts one end surface of the stroke opening, the D vent pipe, C vent pipe / E vent pipe of the main valve body is connected to one of the valve core air chambers, and at the same time, the S vent pipe, E vent pipe / C vent pipe of the main valve body is connected to the other valve core air chamber; The reversing valve core is linked to the rotating shaft.

[0011] Preferably, the control element is a pilot valve; The D capillary of the pilot valve is connected to the D vent pipe, the S capillary of the pilot valve is connected to the S vent pipe, the E capillary of the pilot valve is connected to one of the pressure balance air chambers, and the C capillary of the pilot valve is connected to the other pressure balance air chamber.

[0012] Preferably, the rotating shaft is sealedly connected to the two air chamber partition bearings; the end of the rotating shaft has a D-shaped cross-section, and the reversing valve core is provided with a D-shaped groove adapted thereto.

[0013] Preferably, the stroke limit block includes a rotating shaft blade fixed integrally with the rotating shaft, and the surface of the rotating shaft blade is covered with a sealing layer; contact reducing grooves are provided on the two end faces of the air chamber dividing bin to reduce the contact area between the air chamber dividing bin and the two air chamber partition end faces; the dividing fixed seal also maintains a closed contact with the inner wall of the main valve body.

[0014] Preferably, a spine sealing strip is fixedly mounted on the spine of the valve core.

[0015] Preferably, the reversing valve core has valve core sealing rings installed at both ends so that the valve core sealed space forms an independent sealed space; the valve core sealing ring and the spine sealing strip are integrated into an integrated structure.

[0016] Preferably, both end surfaces of the air chamber partition compartment are provided with raised heads protruding from the end surfaces, and countersunk holes matching the raised heads are opened on the inner walls of the two air chamber partitions.

[0017] Preferably, the pilot valve is fixed to the main valve by using a mounting bracket.

[0018] Preferably, the main valve body comprises a valve housing and end covers sealed at both ends of the valve housing; A valve core base is also provided between the reversing valve core and the adjacent end cover, two hollow grooves are provided on the side of the valve core base, the area between the two hollow grooves constitutes a guide block, and a guide groove adapted to the guide block is provided on the inner wall of the main valve body.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is ingeniously conceived, and utilizes a rotary linkage method to change the flow direction of the refrigerant, thereby realizing efficient switching of the air-conditioning system between different working modes; that is, two relatively independent enclosed spaces are designed in the main valve body, and the two enclosed spaces are connected by a rotating shaft. When a pressure difference is generated in the enclosed space for receiving the high-pressure and low-pressure gases of the pilot valve, the direction of the reversing valve core in the other enclosed space will be changed through the rotating shaft, so that the pressure difference is utilized to quickly realize the reversing action of the four-way valve, with fast response speed and high reversing accuracy.

[0020] 2. The present invention is a pioneering new design. The enclosed space of the rotating air chamber, the enclosed space of the valve core and its internal structure effectively isolate different gas paths, without the traditional fault defects such as internal leakage, gas cross-talk and slider "stuck".

[0021] 3. The structural design of the present invention is ingenious. The air pressure difference drives the rotation of the reversing valve core in the valve core enclosed space, while ensuring that the air chamber partition in the rotating air chamber enclosed space is not affected by the air pressure difference and maintains a self-balanced state. This advantage is achieved through the rotating air chamber enclosed space, the valve core enclosed space and its internal structure, without the need for additional design structures to overcome the circumferential force acting on the air chamber partition; the structural design is unique and simple, compact and small, occupies little space, and is flexible to install, and can be integrated into various heating, ventilation and air conditioning (HVAC) systems.

[0022] 4. The present invention has stable performance, high reliability, economy and durability, provides a strong guarantee for the stable operation of the entire heating, ventilation and air conditioning (HVAC) system, is easy to produce and has low manufacturing cost, and is of great significance in the field of four-way valve technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional directional structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the present invention when viewed from above.

[0025] Figure 3 This is a schematic diagram of the explosion structure of the main valve of the present invention. Figure 1 .

[0026] Figure 4 This is a schematic diagram of the explosion structure of the main valve of the present invention. Figure 2 .

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the main valve of the present invention.

[0028] Figure 6 It is a schematic diagram of the assembly structure of the air chamber partition compartment, the rotating shaft, the travel limit block, etc. of the present invention.

[0029] Figure 7 The present invention Figure 6 Schematic diagram of the structure from top view.

[0030] Figure 8 The structure of the reversing valve core of the present invention is shown in FIG. Figure 1 .

[0031] Fig. 9 The structure of the reversing valve core of the present invention is shown in FIG. Figure 2 .

[0032] Fig.10 It is a structural schematic diagram of the force condition of the air chamber partition compartment in the closed space of the rotating air chamber of the present invention.

[0033] In the figure: 1, control element; 11, E capillary; 12, C capillary; 13, D capillary; 14, S capillary; 2, main valve; 22, main valve body; 221, valve shell; 222, end cover; 223, guide groove; 231, air chamber partition; 2311, countersunk hole; 232, air chamber partition; 2321, stroke opening; 2322, raised head; 2323, contact reduction groove; 233, rotating shaft; 234, stroke limit block; 2341, seal Component layer; 235, split fixed seal; 236, pressure balance air chamber; 237, bearing; 241, reversing valve core; 2411, valve core air chamber; 2412, valve core spine; 2413, spine sealing strip; 2414, valve core sealing ring; 2415, valve core base; 2416, hollow groove; 2417, guide block; 2418, D-type groove; 25, D vent pipe; 26, C vent pipe; 27, E vent pipe; 28, S vent pipe; 3, installation bracket. DETAILED DESCRIPTION

[0034] In order to enable readers to better understand the design purpose of the present invention, the technical solution of the present invention is further described in combination with the embodiments below. It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back", etc., are based on the visual directions shown in the corresponding drawings of the specification, which should not and should not be regarded as limiting the protection scope or technical solution of the present invention. Its purpose is only to facilitate those skilled in the art to better understand the technical solution created by the present invention.

[0035] In the description of this specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example 1

[0037] A four-way valve reversing method, the method specifically comprising: Two relatively independent closed spaces are designed inside the main valve body 22 of the four-way valve; Two relatively independent pressure-balancing air chambers 236 are designed in one of the closed spaces, and a pressure difference is formed between the two pressure-balancing air chambers 236 by using the control element 1, and the pressure difference is used to drive the rotating shaft 233 passing through the two closed spaces to rotate; A reversing valve core 241 is installed in another closed space, and a D vent pipe 25, a C vent pipe 26, an S vent pipe 28, and an E vent pipe 27 are provided along the circumferential direction of the reversing valve core 241, which are in closed communication with the main valve body 22; two relatively independent valve core air chambers 2411 are designed on the reversing valve core 241. The valve core air chamber 2411 in this embodiment specifically refers to two independent grooves provided on the reversing valve core 241, and the closed space formed by the groove space and the inner wall of the main valve body 22 is the valve core air chamber 2411. The rotation of the rotating shaft 233 drives the reversing valve core 241 to rotate, thereby changing the positions of the two valve core air chambers 2411, so that the D vent pipe 25, the C vent pipe 26 / the E vent pipe 27 are connected to one of the valve core air chambers 2411, and the S vent pipe 28, the E vent pipe 27 / the C vent pipe 26 are connected to the other valve core air chamber 2411.

[0038] The four-way valve is a key component in HVAC systems, especially in systems that require switching between cooling and heating modes. It is mainly used to control the flow of refrigerant in heat pump systems, air conditioning systems, and similar equipment with cooling and heating functions.

[0039] The working principle of the method of this embodiment is as follows: the control element 1 (such as a pilot valve, etc.) will deliver high and low pressure gases to the two pressure balance air chambers 236 respectively. Under the action of the control element 1, a pressure difference will be generated between the two pressure balance air chambers 236. The pressure difference drives the rotating shaft 233 to rotate. The rotation of the rotating shaft 233 drives the rotation of the reversing valve core 241. The rotation of the reversing valve core 241 changes the position of the valve core air chamber 2411, so that the D vent pipe 25, the C vent pipe 26 / the E vent pipe 27 are connected to one of the valve core air chambers 2411, and the S vent pipe 28, the E vent pipe 27 / the C vent pipe 26 are connected to the other valve core air chamber 2411. The direction of the pressure difference determines the rotation direction of the rotating shaft 233. By changing the direction of the pressure difference, the rotation direction of the rotating shaft 233 can be changed accordingly. Assume that under the action of air pressure difference, at this time "D vent pipe 25 is connected with C vent pipe 26, and S vent pipe 28 is connected with E vent pipe 27"; change the direction of air pressure difference, and the rotating shaft 233 rotates in the opposite direction, at this time "D vent pipe 25 is connected with E vent pipe 27, and S vent pipe 28 is connected with C vent pipe 26".

[0040] The present embodiment is ingeniously conceived, and utilizes a rotary linkage method to change the flow direction of the refrigerant, thereby realizing efficient switching of the air-conditioning system between different working modes; that is, two relatively independent enclosed spaces are designed in the main valve body, and the two enclosed spaces are connected by a rotating shaft. When a pressure difference is generated in the enclosed space used to receive the high-pressure and low-pressure gases of the pilot valve, the direction of the reversing valve core in the other enclosed space will be changed through the rotating shaft, so that the pressure difference is utilized to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0041] This embodiment is a pioneering new design. The enclosed space of the rotating air chamber, the enclosed space of the valve core and their internal structure effectively isolate different gas paths, without traditional fault defects such as internal leakage, gas cross-talk and slider "stuck" and so on.

[0042] Example 2

[0043] Based on Example 1, this example continues to describe in detail the technical features involved therein and the functions and roles played by the technical features in the present invention, so as to help technicians in this field fully understand the technical solution of the present invention and reproduce it.

[0044] like Figures 1 to 9 As shown, a linkage four-way valve using the above-mentioned four-way valve reversing method includes a control element 1 and a main valve 2, wherein the main valve 2 includes a main valve body 22 of a closed structure; the main valve body 22 is provided with a rotating air chamber closed space and a valve core closed space inside. Among them, the rotating air chamber closed space includes an air chamber partition chamber 232 with a stroke opening 2321 and a hollow structure; the air chamber partition chamber 232 is located between two oppositely arranged air chamber partitions 231 that are tightly connected to the inner wall of the main valve body 22, and the air chamber partition chamber 232 is relatively stationary with the two air chamber partitions 231; a rotating shaft 233 that penetrates the rotating air chamber closed space and extends to the valve core closed space is provided in the air chamber partition chamber 232, and of course the rotating shaft 233 that penetrates horizontally is connected to the bearings of the two air chamber partitions 231 and is tightly connected. A stroke limit block 234 with limiting and sealing functions is fixedly installed on the rotating shaft 233; the sealing function here means that the stroke limit block 234 must maintain a sealed contact with the inner wall of the valve housing 221 and the end face of the air chamber partition 231. The stroke limit block 234 can swing back and forth in the stroke opening 2321, and in a natural state without external pressure interference (that is, when the control element 1 is not working), the stroke limit block 234 is in the middle position of the stroke opening 2321. A dividing fixed seal 235 in a sealed contact with the rotating shaft 233 is provided in the middle position of the air chamber partition chamber 232 along the axial direction; the dividing fixed seal 235 and the stroke limit block 234 divide the space in the air chamber partition chamber 232 into two independent pressure balancing air chambers 236 with a pressure difference provided by the control element 1.

[0045] A reversing valve core 241 is provided in the valve core sealed space, and the reversing valve core 241 is linked to the rotating shaft 233. The reversing valve core 241 has two symmetrical valve core air chambers 2411 along its body surface, and the valve core back 2412 between the two valve core air chambers 2411 is sealed and connected to the inner wall of the main valve body 22; when the stroke limit block 234 contacts one end surface of the stroke opening 2321, the D vent pipe 25, C vent pipe 26 / E vent pipe 27 of the main valve body 22 is connected to one of the valve core air chambers 2411, and at the same time, the S vent pipe 28, E vent pipe 27 / C vent pipe 26 of the main valve body 22 is connected to the other valve core air chamber 2411.

[0046] The specific action process of this embodiment is: under the action of the control element 1, a pressure difference will be generated between the two pressure balance air chambers 236. Under the action of the pressure difference, the rotating shaft 233 will rotate toward the pressure balance air chamber 236 with low pressure until the stroke limit block 234 is limited by one end face of the stroke opening 2321. The rotation of the rotating shaft 233 links the reversing valve core 241. It is assumed that at this time, the D vent pipe 25 and the C vent pipe 26 of the main valve body 22 are connected to the No. 1 valve core air chamber 2411, and the S vent pipe 28 and the E vent pipe 27 of the main valve body 22 are connected to the No. 2 valve core air chamber 2411. When the control element 1 gives the two pressure balance air chambers 236 opposite pressure differences, the rotating shaft 233 will rotate in the opposite direction until the travel limit block 234 is limited by the other end face of the travel opening 2321. The rotation of the rotating shaft 233 links the reversing valve core 241. At this time, the D vent pipe 25 and the E vent pipe 27 of the main valve body 22 are connected to the No. 1 valve core air chamber 2411. At the same time, the S vent pipe 28 and the C vent pipe 26 of the main valve body 22 are connected to the No. 2 valve core air chamber 2411. In this way, the switching between the refrigeration cycle and the heating cycle is realized quickly.

[0047] The present embodiment is ingeniously conceived, and utilizes a rotary linkage method to change the flow direction of the refrigerant, thereby realizing efficient switching of the air-conditioning system between different working modes; that is, two relatively independent enclosed spaces are designed in the main valve body, and the two enclosed spaces are connected by a rotating shaft. When a pressure difference is generated in the enclosed space used to receive the high-pressure and low-pressure gases of the pilot valve, the direction of the reversing valve core in the other enclosed space will be changed through the rotating shaft, so that the pressure difference is utilized to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0048] This embodiment is a pioneering new design. The enclosed space of the rotating air chamber, the enclosed space of the valve core and their internal structure effectively isolate different gas paths, without traditional fault defects such as internal leakage, gas cross-talk and slider "stuck" and so on.

[0049] The structural design of this embodiment is ingenious. The air pressure difference drives the rotation of the reversing valve core in the valve core closed space, while ensuring that the air chamber partition in the rotating air chamber closed space is not affected by the air pressure difference and maintains a self-balanced state. This advantage is achieved by the rotating air chamber closed space, the valve core closed space and its internal structure, without the need for additional design structures to overcome the circumferential force acting on the air chamber partition. Specifically, Fig.10 As shown, one of the two pressure-balancing air chambers 236 inputs high-pressure gas, and the other inputs low-pressure gas. The pressure difference between the two pressure-balancing air chambers 236 pushes the travel limit block 234 until it is limited by one end face of the travel opening 2321. At this time, both end faces of the travel opening 2321 are exerted with force by the high-pressure gas, so the air chamber partition chamber 232 can reach a self-balancing state without generating circumferential force due to the high-pressure gas. If the air chamber partition chamber 232 cannot reach a self-balancing state, a circumferential rotation force will be generated under the action of the high-pressure gas. Obviously, the air chamber partition chamber 232 cannot rotate circumferentially. Therefore, if the self-balancing state cannot be achieved, an additional structure needs to be designed to overcome the circumferential force acting on the air chamber partition chamber. The structural design of this embodiment does not require this process, laying a solid foundation for the compact and low-cost manufacturing of the entire product.

[0050] The structural design of this embodiment is unique and simple, compact and small, occupies little space, and is flexible to install. It can be integrated into various heating, ventilation and air conditioning (HVAC) systems, such as household air conditioners.

[0051] This embodiment has stable performance, high reliability, economy and durability, provides a strong guarantee for the stable operation of the entire heating, ventilation and air conditioning (HVAC) system, is easy to produce and has a low manufacturing cost, and is of great significance in the field of four-way valve technology.

[0052] Example 3

[0053] Based on Example 2, this example continues to describe in detail the technical features involved and the functions and roles played by the technical features in the present invention, so as to help technicians in this field fully understand the technical solution of the present invention and reproduce it.

[0054] like Figures 1 to 10As shown, a linkage four-way valve using the above-mentioned four-way valve reversing method includes a control element 1 and a main valve 2. In this embodiment, the control element 1 is a pilot valve, which is an existing mature product. In order to avoid cumbersome writing, its working principle is not repeated here. The D capillary 13 of the pilot valve is connected to the D vent pipe 25, the S capillary 14 of the pilot valve is connected to the S vent pipe 28, the E capillary 11 of the pilot valve is connected to one of the pressure balancing air chambers 236, and the C capillary 12 of the pilot valve is connected to the other pressure balancing air chamber 236. According to the requirements of the cooling or heating mode, the pilot valve causes the two pressure balancing air chambers 236 to produce an air pressure difference. The pilot valve is fixed to the main valve 2 using a mounting bracket 3.

[0055] The main valve 2 includes a main valve body 22 of a closed structure; the main valve body 22 is provided with a rotating air chamber closed space and a valve core closed space inside. Among them, the rotating air chamber closed space includes an air chamber partition chamber 232 with a stroke opening 2321 and a hollow structure. The air chamber partition chamber 232 is located between two oppositely arranged air chamber partitions 231 that are tightly connected to the inner wall of the main valve body 22, and the air chamber partition chamber 232 is relatively stationary with the two air chamber partitions 231. The two end surfaces of the air chamber partition chamber 232 are provided with a raised head 2322 protruding from the end surface, and the inner walls of the two air chamber partitions 231 are provided with a countersunk hole 2311 that matches the raised head 2322. Through a simple countersunk design, the air chamber partition chamber 232 maintains a relatively static position relationship with the two air chamber partitions 231 in the main valve body 22. The structural design is simple and does not occupy space. A rotating shaft 233 is provided in the air chamber partition chamber 232, which penetrates the enclosed space of the rotating air chamber and extends to the enclosed space of the valve core. A travel limit block 234 with limiting and sealing functions is fixedly installed on the rotating shaft 233. The sealing function here means that the travel limit block 234 must maintain a closed contact with the inner wall of the valve housing 221 and the end face of the air chamber partition 231. The travel limit block 234 can swing back and forth in the stroke opening 2321, and in a natural state without external pressure intervention (that is, when the control element 1 is not working), the travel limit block 234 is in the middle position of the stroke opening 2321; a dividing fixed seal 235 in a closed contact with the rotating shaft 233 is provided in the middle position of the air chamber partition chamber 232 along the axial direction; the dividing fixed seal 235 and the travel limit block 234 divide the space in the air chamber partition chamber 232 into two independent pressure balancing air chambers 236 with a pressure difference provided by the control element 1. The mutual coordination of the air chamber dividing chamber 232, the stroke limit block 234, the dividing fixed seal 235 and other structures prevents the high and low pressure gases filled in the two pressure balance air chambers 236 from mixing and leaking, thereby ensuring the speed and accuracy of the rotation response of the rotating shaft 233 and the reversing valve core 241, thereby ensuring the speed and accuracy of the reversing of the four-way valve.

[0056] The stroke limit block 234 of this embodiment specifically includes a rotating shaft blade (not shown in the figure) fixed to the rotating shaft 233, the surface of the rotating shaft blade is coated with a sealing layer 2341, and the two end surfaces of the air chamber partition 232 are provided with a contact reduction groove 2323. The contact reduction groove 2323 is to reduce the contact area between the air chamber partition 232 and the end surface of the two air chamber partitions 231, so as to save raw materials and reduce the manufacturing cost of the product. Due to the design of the above-mentioned related structure, a good independent closed space will be formed between the two pressure balance air chambers 236, and the contact reduction treatment will not affect the airtightness between the two pressure balance air chambers 236, and the raw materials can be reasonably saved without reducing the product quality. The split fixed seal 235 of this embodiment also maintains a closed contact with the inner wall of the main valve body 22, further ensuring the airtightness between the two pressure balance air chambers 236. The split fixed seal 235, the back seal strip 2413, the valve core seal ring 2414, the sealing layer 2341, etc. are all rubber parts.

[0057] A reversing valve core 241 is provided in the closed space of the valve core, and the reversing valve core 241 is linked to the rotating shaft 233. The rotating shaft 233 is bearing-sealed and connected to the two air chamber partitions 231, that is, the two ends of the rotating shaft 233 are connected to the two air chamber partitions 231 through bearings 237, which ensures the flexibility of the rotation of the rotating shaft 233; at the same time, the rotating shaft 233 and the air chamber partition 231 are sealed by rubber parts, which further ensures the sealing of the pressure balance air chamber 236. The rubber parts between the rotating shaft 233 and the air chamber partition 231 can be designed as an integral part with the sealing layer 2341 to reduce the number of parts and facilitate production and assembly. The end of the rotating shaft 233 has a D-shaped cross-section, and the reversing valve core 241 is provided with a D-shaped groove 2418 adapted thereto; the D-hole connection structure is simple in design, simple in assembly, low in manufacturing cost, and flexible in action connection.

[0058] The reversing valve core 241 of this embodiment is provided with two symmetrical valve core air chambers 2411 along its body surface, and the valve core ridge 2412 between the two valve core air chambers 2411 is tightly connected to the inner wall of the main valve body 22. Specifically, a ridge seal strip 2413 is fixedly installed on the valve core ridge 2412, and a tight connection is achieved through the ridge seal strip 2413; the reversing valve core 241 forms an independent tight space by installing valve core sealing rings 2414 at both ends; the valve core sealing ring 2414 and the ridge seal strip 2413 are integrated into an integrated structure. The specific structural design of the reversing valve core 241 of this embodiment prevents air from flowing or leaking between the two valve core air chambers 2411, further ensuring the speed and accuracy of the reversing of the four-way valve.

[0059] When the stroke limit block 234 contacts one of the end faces of the stroke opening 2321, the D vent pipe 25, C vent pipe 26 / E vent pipe 27 of the main valve body 22 are connected to one of the valve core air chambers 2411, and at the same time, the S vent pipe 28, E vent pipe 27 / C vent pipe 26 of the main valve body 22 are connected to the other valve core air chamber 2411.

[0060] The main valve body 22 of this embodiment includes a valve housing 221 and end covers 222 sealed at both ends of the valve housing 221; a valve core base 2415 is further provided between the reversing valve core 241 and the adjacent end covers 222, two hollow grooves 2416 are provided on the side of the valve core base 2415, and the area between the two hollow grooves 2416 constitutes a guide block 2417, and a guide groove 223 adapted to the guide block 2417 is provided on the inner wall of the main valve body 22. This structural design facilitates product assembly, has high assembly precision, strong product stability, high reliability, and high product quality.

[0061] The present embodiment is ingeniously conceived, and utilizes a rotary linkage method to change the flow direction of the refrigerant, thereby realizing efficient switching of the air-conditioning system between different working modes; that is, two relatively independent enclosed spaces are designed in the main valve body, and the two enclosed spaces are connected by a rotating shaft. When a pressure difference is generated in the enclosed space used to receive the high-pressure and low-pressure gases of the pilot valve, the direction of the reversing valve core in the other enclosed space will be changed through the rotating shaft, so that the pressure difference is utilized to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0062] This embodiment is a pioneering new design. The enclosed space of the rotating air chamber, the enclosed space of the valve core and their internal structure effectively isolate different gas paths, without traditional fault defects such as internal leakage, gas cross-talk and slider "stuck" and so on.

[0063] The structural design of this embodiment is ingenious. The air pressure difference is used to drive the rotation of the reversing valve core in the valve core enclosed space, while ensuring that the air chamber partition compartment in the rotating air chamber enclosed space is not affected by the air pressure difference and maintains a self-balanced state. This advantage is achieved through the rotating air chamber enclosed space, the valve core enclosed space and its internal structure, without the need for additional design structures to overcome the circumferential force acting on the air chamber partition compartment. The structural design of the present invention is unique and simple, compact and small, occupies little space, and is flexible to install. It can be integrated into various heating, ventilation and air conditioning (HVAC) systems.

[0064] This embodiment has stable performance, high reliability, economy and durability, provides a strong guarantee for the stable operation of the entire heating, ventilation and air conditioning (HVAC) system, is easy to produce and has a low manufacturing cost, and is of great significance in the field of four-way valve technology.

[0065] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in the shape, structure, characteristics and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A four-way valve reversing method, characterized in that: The method comprises: Two relatively independent closed spaces are designed inside the main valve body (22) of the four-way valve; Two relatively independent pressure-balancing air chambers (236) are designed in one of the enclosed spaces, and a control element (1) is used to form an air pressure difference between the two pressure-balancing air chambers (236), and the air pressure difference is used to drive a rotating shaft (233) that passes through the two enclosed spaces to rotate; A reversing valve core (241) is installed in another closed space, and a D vent pipe (25), a C vent pipe (26), an S vent pipe (28), and an E vent pipe (27) which are in closed communication with the main valve body (22) are provided along the circumferential direction of the reversing valve core (241); Two relatively independent valve core air chambers (2411) are designed on the reversing valve core (241). The rotation of the rotating shaft (233) drives the reversing valve core (241) to rotate, thereby changing the positions of the two valve core air chambers (2411), so that the D ventilation pipe (25), the C ventilation pipe (26) / the E ventilation pipe (27) are connected to one of the valve core air chambers (2411), and at the same time, the S ventilation pipe (28), the E ventilation pipe (27) / the C ventilation pipe (26) are connected to the other valve core air chamber (2411).

2. A linkage four-way valve using the four-way valve reversing method according to claim 1, comprising a control element (1) and a main valve (2), characterized in that: The main valve (2) comprises a main valve body (22) of a closed structure; a rotating air chamber sealed space and a valve core sealed space are provided inside the main valve body (22); The closed space of the rotating air chamber comprises an air chamber partition chamber (232) having a stroke opening (2321) and a hollow structure; the air chamber partition chamber (232) is located between two air chamber partitions (231) that are arranged opposite to each other and are sealed and connected to the inner wall of the main valve body (22), and the air chamber partition chamber (232) and the two air chamber partitions (231) are relatively stationary; a rotating shaft (233) that passes through the closed space of the rotating air chamber and extends to the closed space of the valve core is provided in the air chamber partition chamber (232), and a stroke limit block (234) having limit and sealing functions is fixedly installed on the rotating shaft (233); The stroke limit block (234) can swing back and forth in the stroke opening (2321), and in a natural state without external pressure interference, the stroke limit block (234) is in the middle position of the stroke opening (2321); a dividing fixed seal (235) in airtight contact with the rotating shaft (233) is provided in the middle position of the air chamber dividing chamber (232) along the axial direction; the dividing fixed seal (235) and the stroke limit block (234) divide the space in the air chamber dividing chamber (232) into two independent pressure balancing air chambers (236) with a pressure difference provided by the control element (1); A reversing valve core (241) is provided in the valve core sealed space. The reversing valve core (241) is provided with two symmetrical valve core air chambers (2411) along its body surface. The valve core spine (2412) between the two valve core air chambers (2411) is sealed and connected to the inner wall of the main valve body (22). When the stroke limit block (234) contacts one end surface of the stroke opening (2321), the D vent pipe (25), C vent pipe (26) / E vent pipe (27) of the main valve body (22) is connected to one of the valve core air chambers (2411). At the same time, the S vent pipe (28), E vent pipe (27) / C vent pipe (26) of the main valve body (22) is connected to the other valve core air chamber (2411). The reversing valve core (241) is linked to the rotating shaft (233).

3. The linkage four-way valve according to claim 2, characterized in that: The control element (1) is a pilot valve; The D capillary tube of the pilot valve is connected to the D vent tube (25), the S capillary tube of the pilot valve is connected to the S vent tube (28), the E capillary tube (11) of the pilot valve is connected to one of the pressure balancing air chambers (236), and the C capillary tube (12) of the pilot valve is connected to the other pressure balancing air chamber (236).

4. The linkage four-way valve according to claim 2, characterized in that: The rotating shaft (233) is hermetically connected to the bearings of the two air chamber partitions (231); the end of the rotating shaft (233) is in a D-shaped cross section, and the reversing valve core (241) is provided with a D-shaped groove (2418) adapted thereto.

5. The linkage four-way valve according to claim 2, characterized in that: The travel limit block (234) comprises a rotating shaft blade fixed integrally with the rotating shaft (233), and the surface of the rotating shaft blade is coated with a sealing layer (2341); the two end surfaces of the air chamber partition chamber (232) are provided with contact reduction grooves (2323) to reduce the contact area between the air chamber partition chamber (232) and the end surfaces of the two air chamber partitions (231); the partition seal (235) also maintains a closed contact with the inner wall of the main valve body (22).

6. The linkage four-way valve according to claim 2, characterized in that: A back sealing strip (2413) is fixedly mounted on the valve core back (2412).

7. The linkage four-way valve according to claim 6, characterized in that: The reversing valve core (241) forms an independent enclosed space by installing valve core sealing rings (2414) at both ends of the valve core enclosed space; the valve core sealing ring (2414) and the spine sealing strip (2413) are integrated into an integrated structure.

8. The linkage four-way valve according to claim 2, characterized in that: The two end surfaces of the air chamber partition (232) are provided with raised heads (2322) protruding from the end surfaces, and the inner walls of the two air chamber partitions (231) are provided with countersunk holes (2311) matching the raised heads (2322).

9. The linkage four-way valve according to claim 3, characterized in that: The pilot valve is fixed on the main valve (2) by means of a mounting bracket (3).

10. The linkage four-way valve according to claim 9, characterized in that: The main valve body (22) comprises a valve housing (221) and end covers (222) sealed at both ends of the valve housing (221); A valve core base (2415) is further provided between the reversing valve core (241) and the adjacent end cover (222), two hollow grooves (2416) are provided on the side of the valve core base (2415), and the area between the two hollow grooves (2416) constitutes a guide block (2417), and a guide groove (223) adapted to the guide block (2417) is provided on the inner wall of the main valve body (22).

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