Linkage four-way valve

Abstract

The utility model discloses a linkage four-way valve, and belongs to the technical field of heating ventilation air conditioning system accessories. The main valve mainly comprises a rotary air chamber closed space and a valve element closed space which are formed in a main valve body, two relatively independent pressure balance air chambers are arranged in the rotary air chamber 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 rotary shaft to rotate; a reversing valve core linked with the rotating shaft is mounted in the valve core closed space; two relatively independent valve core air chambers are arranged on the reversing valve core; the rotating shaft rotates to drive the reversing valve element to rotate, and therefore the positions of the two valve element air chambers are changed. The flow direction of refrigerants 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 utility model belongs to the technical field of HVAC system accessories. Specifically, it relates to a linkage four-way valve with a unique and ingenious structural design, which uses a rotary linkage method to change the flow direction of the refrigerant, has a fast switching response speed, high reversing accuracy, effectively isolates different gas paths through a simple and reasonable internal structure, and has no traditional internal leakage, air cross-talk, and slider "stuck" phenomena. It has stable performance, high reliability, a compact structural design, flexible installation, and can be integrated into various HVAC systems. Background Art

[0002] A four-way valve is a key component in heating, ventilation, and air conditioning (HVAC) systems. It controls the flow of refrigerant in heat pumps, air conditioning systems, and similar equipment with both cooling and heating functions. Reversing a four-way valve involves changing the direction of refrigerant flow to switch between different operating modes in air conditioning systems.

[0003] The four-way valve disclosed in Chinese patent application publication number CN117090963A is a conventional four-way valve. The four-way valve consists of two parts: a pilot valve and a main valve. The main valve is controlled by the pilot valve, and the two are connected by four pilot capillaries. The pilot valve comprises a valve bowl, a spring, an iron core, and a solenoid coil. The pilot valve body has four valve holes connected to the pilot capillaries. The main valve consists of the main valve body and four vent pipes (D, C, E, and S). The E, S, and C vent pipes are located on the same side. The S vent pipe is connected to the compressor's low-pressure inlet pipe, while the E and C vent pipes are connected to the indoor and outdoor heat exchangers. The D vent pipe is located on the other side and is connected to the compressor's high-pressure outlet pipe. The main valve body is equipped with a semicircular slider and two pistons with small holes. The slider acts as a valve, moving left and right on the inner valve seat within the main valve body. This allows the two connecting pipes on the lower side to connect through the two valve holes covered by the slider. The other connecting pipe on the lower side communicates with the main valve body through another valve hole. The piston and slider are connected together by the valve frame and can move synchronously. During cooling operation, the pilot valve coil is de-energized, and the thrust of the spring causes the iron core and valve bowl to move left together. At this time, capillary tube D connects with capillary tube C (high pressure), and capillary tube E connects with capillary tube S (low pressure), thereby pushing the main valve slider to the left. The four-way valve vent pipe E connects with vent pipe S, and vent pipe D connects with vent pipe C. 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 is not rationally designed. The E, C, and S vent pipes are arranged in a row, connected by a slider that moves left and right on the inner valve seat, covering 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 within the main valve. The pressure stability of the high-pressure gas directly affects the tightness between the slider and the inner valve seat. As a result, in actual use, traditional main valves are prone to the following failures:

[0005] 1. Internal leakage: 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, resulting in poor switching accuracy and slow switching speed of the four-way valve.

[0006] 2. Air cross-flow: In traditional main valve designs, the E, C, and S vent pipes are arranged side by side. A slider that moves left and right on the inner valve seat covers two of the valve holes to achieve communication. This design can easily lead to air cross-flow between the high-pressure chamber, the E, C, and S vent pipes. Air cross-flow is another factor that contributes to poor switching accuracy and slow switching speed in four-way valves.

[0007] 3. Slider "stuck" phenomenon: Cross-flow and internal leakage of the four-way valve not only affect the system's switching efficiency between 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 reverse direction, thus causing the slider to "stuck". Once the slider is stuck, the entire system will not function properly, requiring shutdown and maintenance, which will have a significant impact on the stable operation of the entire heating, ventilation and air conditioning (HVAC) system.

[0008] 4. The traditional main valve has a complex structure design, large size and occupies a large space. Utility Model Content

[0009] The purpose of the utility model is to address the deficiencies in the existing technology and provide a linkage four-way valve with a unique and ingenious structural design, which uses a rotary linkage method to change the flow direction of the refrigerant, has a fast switching response speed, high reversing accuracy, effectively isolates different gas paths through a simple and reasonable internal structure, and has no traditional internal leakage, cross-flow, and slider "stuck" phenomena, has stable performance, high reliability, a compact structural design, flexible installation, and can be integrated into various HVAC systems.

[0010] The utility model is realized through the following technical solutions:

[0011] A linked four-way valve, comprising a control element and a main valve, is characterized in that:

[0012] The main valve includes a main valve body which is in sealed communication with the D vent pipe, the C vent pipe, the S vent pipe and the E vent pipe; a rotating air chamber sealed space and a valve core sealed space are provided inside the main valve body;

[0013] Two relatively independent pressure-balancing air chambers are provided in the enclosed space of the rotating air chamber, and a control element is used to form an air pressure difference between the two pressure-balancing air chambers, and the air pressure difference is used to drive the rotating shaft to rotate;

[0014] A reversing valve core linked to the rotating shaft is installed inside the valve core enclosed space, and two relatively independent valve core air chambers are provided on the reversing valve core;

[0015] 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 vent pipe, C vent pipe / E vent pipe 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 is connected to the other valve core air chamber.

[0016] Preferably, the D vent pipe, the C vent pipe, the S vent pipe, and the E vent pipe are in sealed communication with the main valve body along the circumferential direction of the reversing valve core.

[0017] Preferably, the enclosed space of the rotating air chamber includes an air chamber dividing chamber with a stroke opening and a hollow structure; the air chamber dividing chamber is located between two oppositely arranged air chamber partitions that are tightly connected to the inner wall of the main valve body, and the air chamber dividing chamber 232 is relatively stationary with the two air chamber partitions 231; the air chamber dividing chamber is provided with the rotating shaft that passes through the enclosed space of the rotating air chamber and extends to the enclosed space of the valve core, and a stroke limit block with limiting and sealing functions is fixedly installed on the rotating shaft; in a natural state without external pressure interference, the stroke limit block is located between the two end surfaces 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 dividing chamber along the axial direction; the dividing fixed seal and the stroke limit block divide the space in the air chamber dividing chamber into two independent pressure-balancing air chambers with a pressure difference provided by a control element.

[0018] 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 both 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 airtight contact with the inner wall of the main valve body.

[0019] Preferably, both end surfaces of the air chamber partition compartment are provided with raised heads protruding from the end surfaces, and countersunk holes adapted to the raised heads are opened on the inner walls of the two air chamber partitions.

[0020] Preferably, a reversing valve core is provided in the enclosed space of the valve core, and the reversing valve core is provided with two symmetrical valve core air chambers along its body surface, 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 of the end faces 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.

[0021] Preferably, a back sealing strip is fixedly installed on the back of the valve core; and the valve core sealing rings are installed at both ends of the reversing valve core so that the valve core closed space forms an independent closed space.

[0022] Preferably, the main valve body includes a valve housing and end covers sealed at both ends of the valve housing;

[0023] A valve core base is further 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.

[0024] 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 balancing air chambers, and the C capillary of the pilot valve is connected to the other pressure balancing air chamber.

[0025] 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.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The utility model is ingeniously conceived and uses 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. In this way, the pressure difference is used to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0028] 2. This utility model 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, air cross-contamination and slider "stuck".

[0029] 3. This utility model features an ingenious structural design. It utilizes air pressure differentials to drive the rotation of the reversing valve core within the valve core's enclosed space, while simultaneously ensuring that the air chamber compartment within the rotating air chamber's enclosed space remains self-balanced, unaffected by the pressure differential. This advantage is achieved through the rotating air chamber's enclosed space, the valve core's enclosed space, and their internal structure, eliminating the need for additional design to overcome circumferential forces acting on the air chamber compartment. This unique and simple structural design is compact, space-saving, and flexible, allowing for integration into various heating, ventilation, and air conditioning (HVAC) systems.

[0030] 4. The utility model has stable performance, high reliability, economy and durability, providing a strong guarantee for the stable operation of the entire heating, ventilation and air conditioning (HVAC) system. It 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

[0031] Figure 1 It is a schematic diagram of the three-dimensional directional structure of the utility model.

[0032] Figure 2 It is a schematic diagram of the structure of the utility model when viewed from above.

[0033] Figure 3 This is a schematic diagram of the explosion structure of the main valve of this utility model Figure 1 .

[0034] Figure 4 This is a schematic diagram of the explosion structure of the main valve of this utility model Figure 2 .

[0035] Figure 5 It is a schematic diagram of the cross-sectional structure of the main valve of the utility model.

[0036] Figure 6 It is a schematic diagram of the assembly structure of the air chamber partition, rotating shaft, travel limit block, etc. of the utility model.

[0037] Figure 7 This utility model Figure 6 Schematic diagram of the structure from a top-down perspective.

[0038] Figure 8 This is a schematic diagram of the reversing valve core structure of the utility model Figure 1 .

[0039] Figure 9 This is a schematic diagram of the reversing valve core structure of the utility model Figure 2 .

[0040] Figure 10 It is a structural schematic diagram of the force situation of the air chamber partition compartment in the closed space of the rotating air chamber of the utility model.

[0041] In the figure: 1. Control element; 11. Capillary E; 12. Capillary C; 13. Capillary D; 14. Capillary S; 2. Main valve; 22. Main valve body; 221. Valve housing; 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

[0042] 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 below in conjunction with the embodiments. 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, and should not be regarded as limiting the scope of protection 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.

[0043] In the description of this specification, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] Example 1

[0045] A linkage four-way valve comprises a control element 1 and a main valve 2, wherein the main valve 2 comprises a main valve body 22 which is in sealed communication with a D vent pipe 25, a C vent pipe 26, an S vent pipe 28, and an E vent pipe 27; a rotating air chamber sealed space and a valve core sealed space are provided inside the main valve body 22; two relatively independent pressure balancing air chambers 236 are provided in the rotating air chamber sealed space, 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 to rotate; the valve core sealed space is provided. A reversing valve core 241 linked to the rotating shaft 233 is installed inside the closed space, and two relatively independent valve core air chambers 2411 are provided 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 vent pipe 25, C vent pipe 26 / E vent pipe 27 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 are connected to the other valve core air chamber 2411.

[0046] The method for reversing a linked four-way valve in this embodiment specifically includes:

[0047] Two relatively independent closed spaces are designed inside the main valve body 22 of the four-way valve, one is the closed space of the rotating air chamber, and the other is the closed space of the valve core.

[0048] Two relatively independent pressure-balancing air chambers 236 are designed in the enclosed space of the rotating air chamber. The 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 the rotating shaft 233 to rotate.

[0049] A reversing valve core 241 is installed within the enclosed space of the valve core. Along the circumference of the reversing valve core 241, there are provided a D vent pipe 25, a C vent pipe 26, an S vent pipe 28, and an E vent pipe 27, all in sealed communication with the main valve body 22. Two relatively independent valve core air chambers 2411 are designed within the reversing valve core 241. In this embodiment, the valve core air chambers 2411 specifically refer to two independent grooves formed within the reversing valve core 241. The grooves and the inner wall of the main valve body 22 form a sealed space that serves as the valve core air chamber 2411. Rotation of the rotary shaft 233 drives the reversing valve core 241, thereby changing the positions of the two valve core air chambers 2411. This allows the D vent pipe 25, C vent pipe 26, and E vent pipe 27 to communicate with one of the valve core air chambers 2411, while allowing the S vent pipe 28, E vent pipe 27, and C vent pipe 26 to communicate with the other valve core air chamber 2411.

[0050] A four-way valve is a key component in HVAC systems, particularly those that require switching between cooling and heating modes. It is primarily used to control the flow of refrigerant in heat pump systems, air conditioning systems, and similar equipment with both cooling and heating functions.

[0051] The method of this embodiment works as follows: a control element 1 (such as a pilot valve) delivers high- and low-pressure gases to two pressure-balancing chambers 236, respectively. This pressure differential creates a pressure difference between the two pressure-balancing chambers 236, driving the rotating shaft 233 to rotate. This rotation of the rotating shaft 233 drives the reversing valve core 241 to rotate. This rotation of the reversing valve core 241 changes the position of the valve core chambers 2411, connecting the D vent pipe 25, C vent pipe 26, and E vent pipe 27 to one of the valve core chambers 2411 and simultaneously connecting the S vent pipe 28, E vent pipe 27, and C vent pipe 26 to the other valve core chamber 2411. The direction of the pressure differential determines the direction of rotation of the rotating shaft 233. By changing the direction of the pressure differential, the rotation direction of the rotating shaft 233 can be changed accordingly. Assume that under the action of the 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"; if the direction of the air pressure difference is changed, 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".

[0052] This embodiment is ingeniously conceived, and uses a rotary linkage method to change the flow direction of the refrigerant, thereby achieving 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. In this way, the pressure difference is used to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0053] This embodiment 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 traditional fault defects such as internal leakage, air cross-talk and slider "stuck".

[0054] Example 2

[0055] Based on Example 1, this example continues to describe in detail the technical features involved and the functions and roles played by the technical features in the present utility model, so as to help technicians in this field fully understand the technical solution of the present utility model and reproduce it.

[0056] like Figures 1 to 9As shown, a linkage four-way valve includes a control element 1 and a main valve 2. The main valve 2 includes a main valve body 22 that is sealed and connected to a D vent pipe 25, a C vent pipe 26, an S vent pipe 28, and an E vent pipe 27. A rotating air chamber sealed space and a valve core sealed space are provided inside the main valve body 22. Two relatively independent pressure-balancing air chambers 236 are provided in the rotating air chamber sealed space. The control element 1 is used to form a pressure difference between the two pressure-balancing air chambers 236, and the pressure difference is used to drive the rotating shaft 233 to rotate. The valve core A reversing valve core 241 linked to the rotating shaft 233 is installed inside the enclosed space, and two relatively independent valve core air chambers 2411 are provided 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 vent pipe 25, C vent pipe 26 / E vent pipe 27 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 are connected to the other valve core air chamber 2411.

[0057] The main valve 2 of this embodiment includes a main valve body 22 of a closed structure; the interior of the main valve body 22 is provided with a rotating air chamber enclosed space and a valve core enclosed space. Among them, the rotating air chamber enclosed space includes an air chamber partition 232 with a stroke opening 2321 and a hollow structure; the air chamber partition 232 is located between two air chamber partitions 231 that are oppositely arranged and tightly connected to the inner wall of the main valve body 22, and the air chamber partition 232 is relatively stationary with the two air chamber partitions 231; a rotating shaft 233 is provided in the air chamber partition 232, which passes through the rotating air chamber enclosed space and extends to the valve core enclosed space. Of course, the rotating shaft 233 that passes through the horizontally extending rotating shaft 233 is tightly connected to the bearings of the two air chamber partitions 231. A stroke limit block 234 with a limiting and sealing function is fixedly installed on the rotating shaft 233; the sealing function here means that the stroke limit block 234 must maintain a tight contact with the inner wall of the valve housing 221 and the end face of the air chamber partition 231. In a natural state without external pressure interference, the travel limit block 234 is located between the two end faces of the travel opening 2321. Driven by the air pressure difference, the travel limit block 234 can swing back and forth within the travel opening 2321. In a natural state without external pressure interference (i.e., when the control element 1 is not operating), the travel limit block 234 is preferably located in the middle of the travel opening 2321. A partition seal 235 is provided in the middle of the air chamber partition 232 along the axial direction, in airtight contact with the rotating shaft 233. The partition seal 235 and the travel limit block 234 divide the space within the air chamber partition 232 into two independent pressure-balancing air chambers 236, each with a pressure differential provided by the control element 1.

[0058] A reversing valve core 241 is housed within the enclosed space of the valve core, which is operatively connected to the rotating shaft 233. Two symmetrical valve core air chambers 2411 are defined along the surface of the reversing valve core 241. A valve core spine 2412 between the two valve core air chambers 2411 is tightly connected to the inner wall of the main valve body 22. When the travel limit block 234 contacts one end surface of the travel opening 2321, the D vent pipe 25, C vent pipe 26, and E vent pipe 27 of the main valve body 22 communicate with one of the valve core air chambers 2411. Simultaneously, the S vent pipe 28, E vent pipe 27, and C vent pipe 26 of the main valve body 22 communicate with the other valve core air chamber 2411.

[0059] 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-balancing air chambers 236. Under the action of the pressure difference, the rotating shaft 233 will rotate toward the pressure-balancing 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 applies opposite pressure differentials to the two pressure-balancing chambers 236, the rotating shaft 233 rotates 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 then actuates the reversing valve core 241. At this point, the D and E vent pipes 25 and 27 of the main valve body 22 connect to the No. 1 valve core chamber 2411. Simultaneously, the S and C vent pipes 28 and 26 of the main valve body 22 connect to the No. 2 valve core chamber 2411. This allows for rapid switching between the cooling and heating cycles.

[0060] This embodiment is ingeniously conceived, and uses a rotary linkage method to change the flow direction of the refrigerant, thereby achieving 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. In this way, the pressure difference is used to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0061] This embodiment 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 traditional fault defects such as internal leakage, air cross-talk and slider "stuck".

[0062] This embodiment has an ingenious structural design. It drives the rotation of the reversing valve core in the valve core enclosed space by the air pressure difference, while ensuring that the air chamber 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 by the rotating air chamber enclosed space, the valve core enclosed space and their internal structure, without the need for additional design structures to overcome the circumferential force acting on the air chamber compartment. Specifically, Figure 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 stroke limit block 234 until it is limited by one end face of the stroke opening 2321. At this time, both end faces of the stroke opening 2321 are exerted with force by the high-pressure gas, so the air chamber segmentation compartment 232 is able to reach a self-balancing state without generating a circumferential force due to the high-pressure gas. If the air chamber segmentation compartment 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 segmentation compartment 232 cannot rotate circumferentially. Therefore, if the self-balancing state cannot be achieved, an additional design structure is required to overcome the circumferential force acting on the air chamber segmentation compartment. The structural design of this embodiment does not require this process, laying a solid foundation for the compactness and low-cost manufacturing of the entire product.

[0063] The structural design of this embodiment is unique and concise, 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.

[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 low manufacturing cost, and is of great significance in the field of four-way valve technology.

[0065] Example 3

[0066] 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 utility model, so as to help technicians in this field fully understand the technical solution of the present utility model and reproduce it.

[0067] like Figures 1 to 10As shown, the travel limit block 234 of this embodiment specifically includes a rotating shaft blade (not shown) fixed to the rotating shaft 233. The surface of the rotating shaft blade is coated with a sealing layer 2341. The two end surfaces of the air chamber partition 232 are provided with contact reduction grooves 2323. The contact reduction grooves 2323 are designed to reduce the contact area between the air chamber partition 232 and the end surfaces of the two air chamber partitions 231, thereby saving raw materials and reducing product manufacturing costs. Because the above-mentioned related structural design forms a well-established independent and sealed space between the two pressure-balancing air chambers 236, the contact reduction treatment does not affect the airtightness between the two pressure-balancing air chambers 236, thus reasonably saving raw materials without compromising product quality. In this embodiment, the split fixed seal 235 also maintains airtight contact with the inner wall of the main valve body 22, further ensuring the airtightness between the two pressure-balancing air chambers 236. The split fixed seal 235, the back sealing strip 2413, the valve core seal 2414, and the sealing layer 2341 are all rubber components.

[0068] In this embodiment, both end faces of the air chamber partition 232 are provided with raised heads 2322 protruding from the end faces, and the inner walls of the two air chamber partitions 231 are provided with countersunk holes 2311 that are compatible with the raised heads 2322. Through the simple countersunk design, the air chamber partition 232 maintains a relatively static positional relationship with the two air chamber partitions 231 in the main valve body 22. The structural design is simple and does not take up space. A rotating shaft 233 is provided in the air chamber partition 232, which passes through the enclosed space of the rotating air chamber and extends to the enclosed space of the valve core. A stroke limit block 234 with a limiting and sealing function is fixedly installed on the rotating shaft 233. The sealing function here means that the stroke 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 stroke limit block 234 swings back and forth within the stroke opening 2321, and in a natural state without external pressure interference (i.e., when the control element 1 is not operating), the stroke limit block 234 is located in the middle of the stroke opening 2321. A split fixed seal 235 is provided in the middle of the air chamber partition 232 along the axial direction, which is in airtight contact with the rotating shaft 233. The split fixed seal 235 and the stroke limit block 234 divide the space within the air chamber partition 232 into two independent pressure balancing air chambers 236, each of which has a pressure difference provided by the control element 1. The mutual coordination of the air chamber partition 232, the stroke limit block 234, the split fixed seal 235 and other structures prevents the high and low pressure gases filled in the two pressure balancing 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.

[0069] In this embodiment, a back sealing strip 2413 is fixedly mounted on the valve core spine 2412, creating a sealed connection. The reversing valve core 241 is equipped with valve core sealing rings 2414 at both ends, creating an independent, sealed space within the valve core. The valve core sealing rings 2414 and back sealing strip 2413 are integrated into a single, integrated structure. The specific structural design of the reversing valve core 241 in this embodiment prevents cross-flow and leakage between the two valve core air chambers 2411, further ensuring the speed and accuracy of the four-way valve's switching. When the travel limit block 234 contacts one end surface of the travel opening 2321, the D vent pipe 25, C vent pipe 26, and E vent pipe 27 of the main valve body 22 communicate with one of the valve core air chambers 2411. Simultaneously, the S vent pipe 28, E vent pipe 27, and C vent pipe 26 of the main valve body 22 communicate with the other valve core air chamber 2411.

[0070] In this embodiment, the main valve body 22 includes a valve housing 221 and end caps 222 sealing both ends of the valve housing 221. A valve core base 2415 is provided between the reversing valve core 241 and the adjacent end caps 222. Two hollow grooves 2416 are defined on the side of the valve core base 2415. The area between the two hollow grooves 2416 forms a guide block 2417. A guide groove 223 is defined on the inner wall of the main valve body 22 to mate with the guide block 2417. This structural design facilitates product assembly and provides high assembly precision, strong product stability, high reliability, and high product quality.

[0071] In this embodiment, the control element 1 is a pilot valve. This pilot valve is a mature, existing product. To avoid tedious explanation, its operating principle is not detailed here. The pilot valve's D capillary tube 13 is connected to the D vent tube 25, its S capillary tube 14 is connected to the S vent tube 28, its E capillary tube 11 is connected to one pressure-balancing chamber 236, and its C capillary tube 12 is connected to the other pressure-balancing chamber 236. Depending on the desired cooling or heating mode, the pilot valve creates a pressure differential between the two pressure-balancing chambers 236. The pilot valve is secured to the main valve 2 using a mounting bracket 3.

[0072] In this embodiment, 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 and tightly 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 rubber parts between the rotating shaft 233 and the air chamber partition 231 also achieve a sealed effect, further ensuring the tightness 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 that is compatible with it; the D-hole connection structure is simple in design, simple in assembly, low in manufacturing cost, and flexible in movement connection.

[0073] This embodiment is ingeniously conceived, and uses a rotary linkage method to change the flow direction of the refrigerant, thereby achieving 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. In this way, the pressure difference is used to quickly realize the reversing action of the four-way valve, with fast response speed and high switching accuracy.

[0074] This embodiment 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 traditional fault defects such as internal leakage, air cross-talk and slider "stuck".

[0075] This embodiment features an ingenious structural design, using air pressure differentials to drive the rotation of the reversing valve core within the valve core's enclosed space while ensuring that the air chamber compartment within the rotating air chamber's enclosed space remains self-balanced, unaffected by the pressure differential. This advantage is achieved through the rotating air chamber's enclosed space, the valve core's enclosed space, and their internal structure, eliminating the need for additional design to overcome circumferential forces acting on the air chamber compartment. This unique and concise structural design makes it compact, space-saving, and flexible to install, allowing for integration into various heating, ventilation, and air conditioning (HVAC) systems.

[0076] 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 low manufacturing cost, and is of great significance in the field of four-way valve technology.

[0077] In summary, the above are merely 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, features 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 linked four-way valve, comprising a control element (1) and a main valve (2), characterized in that: The main valve (2) includes a main valve body (22) that is in sealed communication with the D vent pipe (25), the C vent pipe (26), the S vent pipe (28), and the E vent pipe (27); a rotating air chamber sealed space (23) and a valve core sealed space (24) are provided inside the main valve body (22); Two relatively independent pressure-balancing air chambers (236) are provided in the closed space (23) of the rotating air chamber. 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 the rotating shaft (233) to rotate. A reversing valve core (241) linked to the rotating shaft (233) is installed inside the valve core closed space (24), and two relatively independent valve core air chambers (2411) are provided 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 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 at the same time, 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).

2. A linkage four-way valve according to claim 1, characterized in that: The D vent pipe (25), the C vent pipe (26), the S vent pipe (28), and the E vent pipe (27) are in sealed communication with the main valve body (22) along the circumferential direction of the reversing valve core (241).

3. The linkage four-way valve according to claim 1, characterized in that: The closed space of the rotating air chamber includes an air chamber partition (232) with a stroke opening (2321) and a hollow structure; the air chamber partition (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 (232) and the two air chamber partitions (231) are relatively stationary; the rotating shaft (233) is provided in the air chamber partition (232) and extends through the closed space of the rotating air chamber and to the closed space of the valve core, and a start limit and a sealing member are fixedly installed on the rotating shaft (233). A travel limit block (234) with a function of the travel limit block (234); in a natural state without external pressure interference, the travel limit block (234) is located between the two end surfaces of the travel 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 compartment (232) along the axial direction; the dividing fixed seal (235) and the travel limit block (234) divide the space in the air chamber dividing compartment (232) into two independent pressure balancing air chambers (236) with a pressure difference provided by the control element (1).

4. A linkage four-way valve according to claim 3, characterized in that: The stroke limit block (234) includes a rotating shaft blade fixed integrally with the rotating shaft (233), and the surface of the rotating shaft blade is covered with a sealing layer (2341); the two end surfaces of the air chamber partition (232) are provided with contact reduction grooves (2323) to reduce the contact area between the air chamber partition (232) and the end surfaces of the two air chamber partitions (231); the dividing seal (235) also maintains a sealed contact with the inner wall of the main valve body (22).

5. The linkage four-way valve according to claim 3, characterized in that: Both 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) adapted to the raised heads (2322).

6. The linkage four-way valve according to claim 1, characterized in that: 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 ridge (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 face 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); the reversing valve core (241) is linked to the rotating shaft (233).

7. The linkage four-way valve according to claim 6, characterized in that: A back sealing strip (2413) is fixedly mounted on the valve core spine (2412); the reversing valve core (241) forms an independent closed space by mounting valve core sealing rings (2414) at both ends of the valve core closed space.

8. The linkage four-way valve according to claim 1, 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).

9. The linkage four-way valve according to claim 1, characterized in that: The control element (1) is a pilot valve; 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).

10. The linkage four-way valve according to claim 1, 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) has a D-shaped cross section, and the reversing valve core (241) is provided with a D-shaped groove (2418) adapted thereto.

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