Three-way valve and its valve body components

Abstract

The present invention discloses a three-way valve and its valve body component. The valve body component includes an upper valve body and a lower valve body which are separately arranged and fixedly connected. The lower valve body has a refrigerant inlet and a first balance hole communicating with the refrigerant inlet. The upper valve body has a second balance hole communicating with the first balance hole and a third balance hole communicating with the second balance hole. The third balance hole is located at the upper end of the upper valve body and communicates with the piston chamber of the upper valve body. The refrigerant inlet, the first balance hole, the second balance hole and the third balance hole are located on the same side of the valve body component. The upper valve body also has a condensation interface, a pressure relief chamber, a first communication hole and a second communication hole located on the same side. The first communication hole communicates with the pressure relief chamber through a pressure relief valve port, the first communication hole directly communicates with the condensation interface, the second communication hole is located at the upper end of the upper valve body and communicates with the pressure relief chamber and the piston chamber of the upper valve body. The condensation interface and the refrigerant inlet are located on different sides of the valve body component. The structure of the valve body component is simple and the processing difficulty is low, so that the processing cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a three-way valve and its valve body components. Background Art

[0002] In a refrigeration system, the switching between the refrigeration mode and the defrosting mode mostly relies on a three-way valve for switching, and the three-way valve is also frequently used for the switching of other similar modes.

[0003] The valve body components of the three-way valve are provided with a refrigerant inlet, a condensation interface, and an evaporation interface. A first valve port and a second valve port are formed in the inner cavity of the valve body components. Among them, the refrigerant inlet is communicated with the condensation interface through the first valve port, and the refrigerant inlet is communicated with the evaporation interface through the second valve port; the valve core components of the three-way valve can axially move along the inner cavity of the valve body components under the drive of the piston components to open the first valve port and close the second valve port, or close the first valve port and open the second valve port, so as to realize the switching between the refrigeration mode and the defrosting mode of the system.

[0004] Among them, a balance hole group is provided on the valve body components to communicate the refrigerant inlet and the piston cavity above the piston components, so as to adjust the pressure at the upper and lower ends of the piston components, thereby driving the piston components to axially move along the valve body components.

[0005] When the three-way valve switches from the refrigeration mode to the defrosting mode, there will still be some high-pressure media in the condensation interface. The three-way valve is also provided with a pressure relief component, which can discharge the high-pressure media in the condensation interface in this case to reduce the pressure in the condensation interface, so as to facilitate the three-way valve to switch back to the refrigeration mode when needed.

[0006] Among them, the pressure relief component is mainly a one-way valve structure, including a valve rod, a spring, and a valve core. The valve body components form a pressure relief cavity and hole structures for accommodating each component. Specifically, the pressure relief cavity is communicated with the first hole structure through a pressure relief valve port. The first hole structure is communicated with the condensation interface through the main cavity of the valve body components. The pressure relief cavity is also communicated with the balance hole group through the second hole structure. The valve core is pressed against and closes the pressure relief valve port under the action of the spring; when there is high-pressure media at the condensation interface, the high-pressure media pushes the valve core to act to open the pressure relief valve port, so that the high-pressure media in the condensation interface is discharged through the first hole structure, the pressure relief valve port, the pressure relief cavity, the second hole structure, and the balance hole group.

[0007] As can be seen from the above, the first hole structure, the second hole structure, and the balance hole group are concentrated on the same side of the valve body components and cross each other. Due to the communication relationship of each hole, some hole structures need to be arranged obliquely, increasing the processing difficulty; at the same time, these structural designs and for facilitating the assembly of the valve core components make the valve body components mainly composed of an upper valve body, a middle valve body, and a lower valve body. Corresponding hole structures are provided on each valve body, and there is a position corresponding relationship between the relevant hole structures that are communicated, and the structure is relatively complex. Summary of the Invention

[0008] The present invention provides a valve body component of a three-way valve, which includes an upper valve body and a lower valve body that are separately arranged and fixedly connected to each other; the lower valve body has a refrigerant inlet and a first balance hole communicating with the refrigerant inlet, the upper valve body has a second balance hole communicating with the first balance hole and a third balance hole communicating with the second balance hole, and the third balance hole is located at the upper end of the upper valve body and communicates with the piston chamber of the upper valve body; the refrigerant inlet, the first balance hole, the second balance hole, and the third balance hole are located on the same side of the valve body component;

[0009] The upper valve body further has a condensation interface, a pressure relief chamber, a first communication hole, and a second communication hole on the same side. The first communication hole communicates with the pressure relief chamber through a pressure relief valve port, the first communication hole directly communicates with the condensation interface, and the second communication hole is located at the upper end of the upper valve body and communicates with the pressure relief chamber and the piston chamber of the upper valve body;

[0010] The condensation interface and the refrigerant inlet are located on different sides of the valve body component.

[0011] For the valve body component of the three-way valve provided by the present invention, the balance holes communicating the piston chamber and the refrigerant inlet are opened on one side of the valve body component, and the pressure relief chamber communicating with the condensation interface and the related communication hole structures are opened on the other side of the valve body component. In this way, the concentration of the balance hole structure and the pressure relief structure at the same part of the valve body component is avoided, and the cross design of the related hole structures is circumvented. Therefore, only two main structures, namely the upper valve body and the lower valve body, are required for the valve body component to realize the processing of the related hole structures, which simplifies the structure of the valve body component, reduces the processing difficulty, and thus can reduce the production cost.

[0012] The present invention further provides a three-way valve, which includes a valve body component and a piston component. The valve body component is the valve body component described in any one of the above, and the piston component is located in the inner cavity of the upper valve body and divides its inner cavity into a piston chamber located above and a main chamber located below.

[0013] Due to the above technical effects of the above valve body component, the three-way valve including this valve body component also has the same technical effects, and will not be repeated here. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the three-way valve provided by the present invention;

[0015] Figure 2 It is Figure 1 a partial enlarged view of part I in

[0016] Figure 3 It is Figure 1 a partial enlarged view of part II in

[0017] Figure 4 is Figure 1 a schematic structural diagram of the spool component in

[0018] Figure 5 is Figure 4 a partial enlarged view of part A in

[0019] Figure 6 is Figure 4 a partial enlarged view of part B in

[0020] Figure 7 a schematic structural diagram of another embodiment of the spool component provided by the present invention;

[0021] Figure 8 is Figure 7 a partial enlarged view of part C in

[0022] Figure 9 is Figure 7 a partial enlarged view of part D in

[0023] Description of reference numerals:

[0024] Valve body component 100, upper valve body 110, pilot port 111, condensation interface 112, piston chamber 113, second balance hole 114, third balance hole 115, first plug 116, lower valve body 120, second valve port 121, refrigerant inlet 122, evaporation interface 123, first balance hole 124, sealing seat 130, first valve port 131, sealing ring 132, gasket 140;

[0025] Piston component 200, piston body 210, elastic component 220, spring seat 230;

[0026] Spool components 300, 300′, connecting shaft 310, first annular step surface 311, second annular step surface 312;

[0027] Sealing assemblies 320a, 320b, seal 321, first sealing protrusion 3211, second sealing protrusion 3212, spacer 322, first sealing groove 3221, pressing block 323, second sealing groove 3231, limiting protrusion 3232;

[0028] Sealing assemblies 320a′, 320b′, seal 321′, spacer 322′, first sealing protrusion 3221′, axial boss 3222′, pressing block 323′, second sealing protrusion 3231′, limiting protrusion 3232′;

[0029] Pressure relief component 400, pressure relief chamber 410, first communication hole 420, second communication hole 430, pressure relief valve port 440, ejector rod 450, pressure relief spool 460, elastic element 470, second plug 480. Detailed implementation manners

[0030] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0031] For the convenience of understanding and concise description, the three-way valve and its valve body components will be described together below, and the beneficial effects will not be repeated.

[0032] It should be noted that the orientation terms such as up, down, left, and right involved in this article are defined based on the positions of the components in the accompanying drawings and the positions of the components relative to each other. Among them, the axial direction refers to the axis direction of the three-way valve, that is, the vertical direction from top to bottom or from bottom to top on the plane of the accompanying drawings; it can be understood that the use of the orientation terms is only for the clarity and convenience of describing the technical solution, and should not constitute a limitation to the protection scope.

[0033] Please refer to Figures 1 to 3 , Figure 1 , which is a schematic structural diagram of an embodiment of the three-way valve provided by the present invention; Figure 2 is Figure 1 a partial enlarged view of part I in Figure 3 is Figure 1 a partial enlarged view of part II in

[0034] As shown in the figure, the three-way valve provided in this embodiment includes a valve body component 100, a piston component 200, a valve core component 300, and a pressure relief component 400.

[0035] The piston component 200 is arranged in the inner cavity of the valve body component 100, and divides the inner cavity of the valve body component 100 into a piston cavity 113 above the piston component 200 and a main cavity below the piston component 200.

[0036] The top end of the valve body component 100 has a pilot port 111 communicating with the piston cavity 113.

[0037] The piston component 200 specifically includes a piston body 210, an elastic component 220, and a spring seat 230; specifically, the piston body 210 divides the inner cavity of the valve body component 100, and the outer peripheral wall of the piston body 210 fits with the inner peripheral wall of the valve body component 100. To ensure the sealing between the separated piston cavity 113 and the main cavity, a sealing member is also provided between the piston body 210 and the valve body component 100; the two ends of the elastic component 220 are respectively abutted against the top end of the valve body component 100 and the piston body 210. To position the elastic component 220 and prevent the elastic component 220 from skewing, a spring seat 230 is fixedly provided on the piston body 210, and the lower end of the elastic component 220 is inserted into the spring seat 230.

[0038] The valve body component 100 further has a condensation interface 112, a refrigerant inlet 122, and an evaporation interface 123 that communicate with the main chamber. Among them, the refrigerant inlet 122 communicates with the condensation interface 112 through a first valve port 131, and the refrigerant inlet 122 communicates with the evaporation interface 123 through a second valve port 121; as Figure 1 shown, along the axial direction of the valve body component 100, the condensation interface 112, the refrigerant inlet 122, and the evaporation interface 123 are arranged from top to bottom. Correspondingly, the first valve port 131 is located above the second valve port 121.

[0039] The valve core component 300 is located in the main chamber of the valve body component 100 and is connected to the piston body 210. When the pressures at the upper and lower ends of the piston body 210 change, the piston body 210 can move up and down along the axial direction of the valve body component 100, driving the valve core component 300 to move up and down along the axial direction together, so as to close the first valve port 131, open the second valve port 121, or open the first valve port 131 and close the second valve port 121.

[0040] Refer to Figure 1 , the valve body component 100 is also provided with a balance hole group that communicates the refrigerant inlet 122 with the piston chamber 113.

[0041] During operation, when the pilot port 111 is closed, a part of the high-pressure refrigerant entering from the refrigerant inlet 122 can enter the piston chamber 113 through the balance hole group. In this way, the pressures at the upper and lower ends of the piston body 210 are balanced. Under the action of the elastic component 220, the piston body 210 keeps the valve core component 300 in the state of closing the second valve port 121 and opening the first valve port 131, that is, Figure 1 the state shown. At this time, the refrigerant inlet 122 communicates with the condensation interface 112 through the first valve port 131, and the high-pressure refrigerant flows out from the condensation interface 112 to realize the refrigeration function.

[0042] During operation, when the pilot port 111 is opened, a part of the high-pressure refrigerant entering from the refrigerant inlet 122 still enters the piston chamber 113 through the balance hole group. Since the pilot port 111 is in the open state at this time, this part of the refrigerant will be discharged through the pilot port 111 after entering the piston chamber 113. In this way, the pressure in the piston chamber 113 decreases, and the pressure at the lower end of the piston body 210 is greater than the pressure at its upper end. Under the action of the pressure difference, the piston body 210 moves upward against the elastic force of the elastic component 220, and the valve core component 300 moves upward accordingly to open the second valve port 121 and close the first valve port 131. At this time, the refrigerant inlet 122 communicates with the evaporation interface 123 through the second valve port 121, and the high-pressure refrigerant flows out from the evaporation interface 123 to realize the heating function.

[0043] In actual work, after the three-way valve is switched from the refrigeration mode to the heating mode, there will inevitably be some high-pressure refrigerant in the condensation interface 112. To facilitate switching back to the refrigeration mode when needed later, it is necessary to discharge this part of the high-pressure refrigerant in the condensation interface 112. Therefore, the three-way valve is also provided with a pressure relief component 400.

[0044] Reference Figure 1 and Figure 2 In this embodiment, the pressure relief component 400 includes a pressure relief chamber 410, a first communication hole 420, and a second communication hole 430 formed in the valve body component 100; wherein, the first communication hole 420 communicates with the pressure relief chamber 410 through a pressure relief valve port 440, the pressure relief chamber 410 communicates with the piston chamber 113 through the second communication hole 430, and the first communication hole 420 communicates with the condensation interface 112.

[0045] The pressure relief component 400 further includes a push rod 450, an elastic element 470, and a pressure relief valve core 460. Among them, the push rod 450 is fixedly arranged in the pressure relief chamber 410, and the elastic element 470 is arranged between the push rod 450 and the pressure relief valve core 460 to press the pressure relief valve core 460 against the pressure relief valve port 440, and the pressure relief valve core 460 and the pressure relief valve port 440 form a sealing pair.

[0046] It can be understood that in order to facilitate the assembly of the push rod 450, the elastic element 470, and the pressure relief valve core 460, the pressure relief chamber 410 formed in the valve body component 100 has an open structure.

[0047] Similarly, it can be understood that under normal conditions, the elastic element 470 presses the pressure relief valve core 460 against the pressure relief valve port 440 to enable it to close the pressure relief valve port 440 and cut off the passage between the first communication hole 420 and the pressure relief chamber 410.

[0048] When the three-way valve is switched from the refrigeration mode to the heating mode, if there is high-pressure refrigerant in the condensation interface 112, since the condensation interface is connected to the first communication hole 420, this high-pressure refrigerant will act on the pressure relief valve core 460 through the first communication hole 420, push up the pressure relief valve core 460 against the elastic force of the elastic element 470 to open the pressure relief valve port 440, so that the high-pressure refrigerant can enter the pressure relief chamber 410 through the first communication hole 420 and the pressure relief valve port 440, and then enter the piston chamber 113 through the pressure relief chamber 410 and the second communication hole 430 and be discharged from the pilot port 111, reducing the pressure in the condensation interface 112 and facilitating switching back to the refrigeration mode when needed later.

[0049] In a specific solution, the first communication hole 420 of the pressure relief component 400 is directly connected to the condensation interface 112, and the second communication hole 430 is directly connected to the piston chamber 113. After such a setting, it is equivalent to arranging the pressure relief chamber 410, the first communication hole 420, and the second communication hole 430 on the wall of the valve body component 100 close to the condensation interface 112 and the piston chamber 113, such asFigure 1 and Figure 2 As shown, obviously, the pressure relief cavity 410, the first communication hole 420, and the second communication hole 430 are on the same side as the condensation interface 112 and are located in the upper part of the valve body component 100.

[0050] In addition, since the first communication hole 420 of the pressure relief component 400 is directly communicated with the condensation interface 112 and the second communication hole 430 is directly communicated with the piston cavity 113, the relevant hole structures of the pressure relief component 400 do not need to be associated with the aforementioned balance hole group in terms of position, avoiding the problem of intersection of the relevant hole structures caused by setting the relevant structures of the pressure relief component 400 and the balance hole group at the same position in the background art, enabling each hole structure to be flexibly arranged as needed and reducing the processing difficulty.

[0051] In a specific solution, the refrigerant inlet 122 and the condensation interface 112 are on different sides of the valve body component 100. Since the aforementioned balance hole group communicates the refrigerant inlet 122 and the piston cavity 113, for the convenience of processing, the balance hole group is arranged on the same side as the refrigerant inlet 122. In this way, the relevant structures of the pressure relief component 400 and the balance hole group are prevented from interfering with each other, making the processing more convenient.

[0052] In the illustrated solution, the refrigerant inlet 122 and the balance hole group are on the right side of the valve body component 100 in the illustration, and the condensation interface 112 and the pressure relief component 400 are on the left side of the valve body component 100 in the illustration. That is to say, the two are on opposite sides of the valve body component 100. It can be understood that during actual processing, as long as the two are staggered in the circumferential direction of the valve body component 100, and specifically can be set according to actual requirements.

[0053] In this embodiment, as Figure 1 shown, the valve body component 100 includes an upper valve body 110 and a lower valve body 120 that are separately arranged and fixedly connected; the aforementioned piston cavity 113 and the condensation interface 112 are both formed in the upper valve body 110, and the pressure relief component 400 is also provided in the upper valve body 110; the aforementioned refrigerant inlet 122, the evaporation interface 123, and the second valve port 121 are all formed in the lower valve body 120. Specifically, the evaporation interface 123 and the condensation interface 112 are on the same side of the valve body component 100.

[0054] The aforementioned balance hole group is formed in the upper valve body 110 and the lower valve body 120. Specifically, the balance hole group includes a first balance hole 124 opened in the lower valve body 120, a second balance hole 114 opened in the upper valve body 110, and a third balance hole 115; among them, the first balance hole 124 communicates the refrigerant inlet 122 and the second balance hole 114, and the third balance hole 115 communicates the second balance hole 114 and the piston cavity 113.

[0055] In a specific solution, the first balance hole 124 is obliquely arranged, the second balance hole 114 extends upward from the bottom of the upper valve body 110 to the position of the piston chamber 113, and the third balance hole 115 is arranged substantially horizontally to communicate the second balance hole 114 with the piston chamber 113.

[0056] For the convenience of machining, the third balance hole 115 penetrates the wall surface of the upper valve body 110. At the same time, to ensure the sealing performance, the opening of the third balance hole 115 can be sealed by the first plug 116.

[0057] Specifically, the center line of the third balance hole 115 can be arranged perpendicular to the axis of the valve body component 100, which is convenient for machining and can also shorten the flow path of the balance hole group.

[0058] As described above, since the pressure relief chamber 410 of the pressure relief component 400 and the related communication hole structures and the balance hole group are arranged on different sides of the valve body component 100, the concentration of the balance hole group and the pressure relief structure at the same part of the valve body component 100 is avoided, and the cross design of the related hole structures is also avoided. Therefore, only two main structures, namely the upper valve body 110 and the lower valve body 120, need to be provided for the valve body component 100 to realize the machining of the related hole structures, which simplifies the structure of the valve body component 100, reduces the machining difficulty, and correspondingly can reduce the production cost.

[0059] In a specific solution, the valve body component 100 further includes a sealing seat 130, the sealing seat 130 is clamped and fixed by the upper valve body 110 and the lower valve body 120, and the aforementioned first valve port 131 is formed on the sealing seat 130.

[0060] Reference Figure 1 , it can be understood that the inner cavities of the upper valve body 110 and the lower valve body 120 are connected to form a valve cavity. The aforementioned piston component 200 is arranged in the upper valve body 110, and the inner cavity of the upper valve body 110 is divided into a piston chamber 113 and a lower chamber. The lower chamber of the upper valve body 110 is connected to the inner cavity of the lower valve body 120 to form the aforementioned main chamber. The first valve port 131 of the sealing seat 130 divides the main chamber, and the inner cavity of the lower valve body 120 is communicated with the lower chamber of the upper valve body 110 through the first valve port 131.

[0061] Specifically, as Figure 3 shown, a groove-shaped structure is formed at the connection between the upper valve body 110 and the lower valve body 120. The outer periphery of the sealing seat 130 is matched with the groove-shaped structure, and the sealing seat 130 is clamped and fixed after the upper valve body 110 and the lower valve body 120 are fixedly connected. Usually, the upper valve body 110 and the lower valve body 120 are detachably fixed by fasteners such as bolts.

[0062] To ensure the sealing performance, a sealing ring 132 is provided at the circumferential wall of the sealing seat 130 and the upper valve body 110 or the lower valve body 120. In the illustrated figure, the sealing ring 132 is disposed between the sealing seat 130 and the lower valve body 120. Similarly, to ensure the sealing performance, a gasket 140 is also provided between the upper valve body 110 and the lower valve body 120. It can be understood that the gasket 140 also has a through hole at the position corresponding to the first balance hole 124, so that the first balance hole 124 is communicated with the second balance hole 114.

[0063] In a specific solution, the central axes of the pressure relief cavity 410 and the first communication hole 420 of the pressure relief component 400 are parallel to the axial direction of the valve body component 100. In this way, the spatial structure of the upper valve body 110 can be reasonably utilized to reduce the volume of the upper valve body 110 and save materials.

[0064] Specifically, the central axis of the condensation interface 112 is perpendicular to the central axis of the first communication hole 420. When pressure relief is required, the high-pressure refrigerant at the condensation interface 112 facilitates the movement of the pressure relief valve core 460.

[0065] More specifically, the central axis of the second communication hole 430 is perpendicular to the central axis of the first communication hole 420. That is to say, the second communication hole 430 is vertically arranged with respect to the pressure relief cavity 410. In this way, the communication path between the pressure relief cavity 410 and the piston cavity 113 can be effectively shortened, which is beneficial to the discharge of the high-pressure refrigerant in the condensation interface 112.

[0066] Specifically, the second communication hole 430 penetrates the wall surface of the valve body component 100. As Figure 2 shown, it can be understood that the second communication hole 430 and the pressure relief cavity 410 are in a cross-shaped structure, which is convenient for the processing of the second communication hole 430. At the same time, to ensure the sealing performance, the opening of the second communication hole 430 is sealed by a second plug 480.

[0067] Please refer to Figures 4 to 6 together with Figure 4 for Figure 1 the structural schematic diagram of the valve core component in Figure 5 for Figure 4 the partial enlarged view of part A in Figure 6 for Figure 4 the partial enlarged view of part B in

[0068] In this embodiment, the valve core component 300 includes a connecting shaft 310, and also includes two sealing components 320a and 320b sleeved on the connecting shaft 310. The two sealing components 320a and 320b are arranged at a preset distance interval and correspond to the first valve port 131 and the second valve port 121 respectively.

[0069] Combined with Figure 1, it can be understood that the upper sealing assembly 320a is used to open and close the first valve port 131, and the lower sealing assembly 320b is used to open and close the second valve port 121.

[0070] The two sealing assemblies 320a and 320b have the same composition structure, both including a seal 321, and a spacer 322 and a pressure block 323 located on both sides of the seal 321. The spacer 322 and the pressure block 323 are both fixedly sleeved on the connecting shaft 310 and squeeze and fix the seal 321.

[0071] Among them, the pressure blocks 323 of the sealing assembly 320a are arranged opposite to the pressure blocks 323 of the sealing assembly 320b. That is to say, the pressure block 323 of the sealing assembly 320a faces the pressure block 323 of the sealing assembly 320b; as Figure 4 shown, for the upper sealing assembly 320a, its pressure block 323 is located below the seal 321. Correspondingly, the spacer 322 is located above the seal 321. For the lower sealing assembly 320b, its pressure block 323 is located above the seal 321. Correspondingly, the spacer 322 is located below the seal 321.

[0072] A first sealing structure is formed between the seal 321 and the spacer 322, and a second sealing structure is formed between the seal 321 and the pressure block 323.

[0073] As described above, the valve core component 300 is provided with two sealing assemblies 320a and 320b on its connecting shaft 310. The seal 321 of each sealing assembly is clamped by the pressure block 323 and the spacer 322 fixedly sleeved on the connecting shaft 310, so as to squeeze and fix the seal 321. This structure is simple and reliable and not easy to fail.

[0074] In a specific solution, the aforementioned first sealing structure is formed between the seal 321 and the spacer 322, and the second sealing structure is formed between the seal 321 and the pressure block 323.

[0075] Specifically, the first sealing structure includes a first sealing groove 3221 formed on the spacer 322 and a first sealing protrusion 3211 formed on the seal 321. The first sealing protrusion 3211 is clamped in the first sealing groove 3221; the second sealing structure includes a second sealing groove 3231 formed on the pressure block 323 and a second sealing protrusion 3212 formed on the seal 321. The second sealing protrusion 3212 is clamped in the second sealing groove 3231.

[0076] In practice, the seal 321 is mostly a component with certain elasticity such as a rubber part. At this time, the first sealing protrusion 3211 and the second sealing protrusion 3212 of the seal 321 can be formed during the process of the spacer 322 and the pressing block 323 clamping and squeezing the seal 321. That is to say, during normal processing, the surfaces of the seal 321 in contact with the pressing block 323 and the spacer 322 are not separately processed with sealing protrusions. During the process of the spacer 322 and the pressing block 323 clamping the seal 321, the seal 321 is formed with sealing protrusions that are clamped in the first sealing groove 3221 and the second sealing groove 3231 through extrusion, realizing sealing.

[0077] Of course, in practice, before assembly, that is, it is also feasible to process the corresponding first sealing protrusion 3211 and second sealing protrusion 3212 on the seal 321. Relatively speaking, the above method is simpler and more reliable.

[0078] As above, the sealing structure is formed by the seal 321, the pressing block 323 and the spacer 322 themselves, without the need to separately set additional sealing components, which can simplify the structure of the valve core component 300.

[0079] In a specific solution, a limiting convex portion 3232 extends axially from the outer periphery of the pressing block 323 towards the spacer 322, and the limiting convex portion 3232 abuts against the outer periphery of the seal 321; the setting of the limiting convex portion 3232 can limit the radial position of the seal 321.

[0080] In a specific solution, both the pressing block 323 and the spacer 322 can be fixed to the connecting shaft 310 by interference fit or welding. This fixing method is simple, reliable and easy to implement.

[0081] In a specific solution, the connecting shaft 310 has an upward first annular step surface 311, and the pressing block 323 of the sealing assembly 320a located above abuts against the first annular step surface 311. It can be understood that the setting of the first annular step surface 311 can limit the axial position of the sealing assembly 320a on the connecting shaft 310 and ensure the opening and closing cooperation between the sealing assembly 320a and the first valve port 131.

[0082] The connecting shaft 310 also has a downward second annular step surface 312, and the pressing block 323 of the sealing assembly 320b located below abuts against the second annular step surface 312. It can be understood that the setting of the second annular step surface 312 can limit the axial position of the sealing assembly 320a on the connecting shaft 310 and ensure the opening and closing cooperation between the sealing assembly 320b and the second valve port 121.

[0083] In addition to the above structure, the valve core component can also have other structural forms. Please refer to them together Figures 7 to 9 , Figure 7Schematic structural diagram of another embodiment of the spool component provided by the present invention; Figure 8 is Figure 7 a partial enlarged view of part C in; Figure 9 is Figure 7 a partial enlarged view of part D in.

[0084] In this embodiment, the spool component 300' also includes a connecting shaft 310 and two sealing components 320a', 320b' sleeved on the connecting shaft 310. The two sealing components 320a', 320b' are arranged at a preset distance apart and correspond to the first valve port 131 and the second valve port 121 respectively.

[0085] The basic structure of this spool component 300' is similar to the previous embodiment, except that the structure of the sealing component is slightly different. The different part will be described in detail below.

[0086] In this embodiment, the sealing components 320a', 320b' also include a sealing member 321' and spacer blocks 322' and pressing blocks 323' located on both sides of the sealing member 321'. The spacer blocks 322' and the pressing blocks 323' are also fixedly sleeved on the connecting shaft 310 and squeeze and fix the sealing member 321'.

[0087] In this embodiment, the first sealing structure formed between the spacer block 322' and the sealing member 321' includes a first sealing convex portion 3221' formed on the spacer block 322'. The first sealing convex portion 3221' is embedded in the sealing member 321' to seal between the two; the second sealing structure formed between the pressing block 323' and the sealing member 321' includes a second sealing convex portion 3231' formed on the pressing block 323'. The second sealing convex portion 3231' is embedded in the sealing member 321' to seal between the two.

[0088] It can be understood that in this embodiment, a first sealing convex portion 3221' structure is provided on the surface of the spacer block 322' in contact with the sealing member 321', and a second sealing convex portion 3231' structure is provided on the surface of the pressing block 323' in contact with the sealing member 321'. When the two clamp the sealing member 321', the first sealing convex portion 3221' and the second sealing convex portion 3231' are respectively squeezed and embedded into the sealing member 321' to form a seal.

[0089] This sealing method has a simple structure and high reliability.

[0090] In this embodiment, the connecting shaft 310 is also provided with an upward first annular step surface 311 and a downward second annular step surface 312 to limit the axial positions of the two sealing components 310a', 310b' on the connecting shaft 310.

[0091] Specifically, in this embodiment, the pressing block 323' also has a limiting convex portion 3232' facing the cushion block 322' to limit the radial position of the seal 321'.

[0092] In a specific solution, the cushion block 322' includes an annular body and an axial boss 3222' extending axially from the inner edge of the annular body towards the pressing block 323'. The axial boss 3222' is inserted into the inner hole of the seal 321'. It can be understood that after such a setting, it is equivalent to forming a receiving portion for the seal 321' between the outer periphery of the axial boss 3222' of the cushion block 322', the annular body of the cushion block 322', and the pressing block 323'.

[0093] It can be understood that when the seal assemblies 320a' and 320b' are assembled to the connecting shaft 310, first, the pressing block 323' is fixedly sleeved on the connecting shaft 310 and abutted against the corresponding annular step surface 311, then the seal 321' is sleeved, and finally the cushion block 322' is sleeved, so that the cushion block 322' is extruded towards the pressing block 323'. The design of the axial boss 3222' of the cushion block 322' can control the extrusion degree of the cushion block 322' on the seal 321' and avoid excessive compression of the seal 321'.

[0094] Of course, in the foregoing Figures 4 to 6 shown embodiment, a similar axial boss can also be provided on the cushion block 322 to limit the compression amount of the seal 321.

[0095] Similarly, in other solutions, the sealing structures in the two embodiments of the above spool components can be combined with each other to form a new structure of the spool component. For example, the sealing structure between the cushion block and the seal adopts the Figures 4 to 6 shown solution, and the sealing structure between the pressing block and the seal adopts the Figures 7 to 9 shown solution.

[0096] The three-way valve and its valve body components provided by the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. The valve body component of a three-way valve, characterized in that, The valve body component has a refrigerant inlet (122), an evaporation interface (123), and a condensation interface (112). The three-way valve includes a refrigeration mode in which the refrigerant inlet (122) communicates with the condensation interface 112, and a heating mode in which the refrigerant inlet (122) communicates with the evaporation interface (123); the valve body component includes an upper valve body (110) and a lower valve body (120) that are separately arranged and fixedly connected; the lower valve body (120) has a refrigerant inlet (122) and a first balance hole (124) that communicates with the refrigerant inlet (122), the upper valve body (110) has a second balance hole (114) that communicates with the first balance hole (124) and a third balance hole (115) that communicates with the second balance hole (114), and the third balance hole (115) is located at the upper end of the upper valve body (110) and communicates with the piston chamber (113) of the upper valve body (110); the refrigerant inlet (122), the first balance hole (124), the second balance hole (114), and the third balance hole (115) are located on the same side of the valve body component (100); The upper valve body (110) also has a condensation interface (112), a pressure relief chamber (410), a first communication hole (420), and a second communication hole (430) that are located on the same side. The first communication hole (420) communicates with the pressure relief chamber (410) through a pressure relief valve port (440), the first communication hole (420) directly communicates with the condensation interface (112), and the second communication hole (430) is located at the upper end of the upper valve body (110) and communicates with the pressure relief chamber (410) and the piston chamber (113) of the upper valve body (110); The condensation interface (112) and the refrigerant inlet (122) are located on different sides of the valve body component (100); The first communication hole (420), the pressure relief valve port (440), the pressure relief chamber (410), and the second communication hole (430) are used to discharge the high-pressure refrigerant at the condensation interface (112) to reduce the pressure at the condensation interface (112) after switching from the refrigeration mode to the heating mode.

2. The valve body component according to claim 1, characterized in that, The centerlines of the pressure relief chamber (410) and the first communication hole (420) are parallel to the axis of the valve body component (100).

3. The valve body component according to claim 2, characterized in that, The centerline of the condensation interface (112) is perpendicular to the centerline of the first communication hole (420).

4. The valve body component according to claim 2, characterized in that, The centerline of the second communication hole (430) is perpendicular to the centerline of the pressure relief chamber (410).

5. The valve body component according to claim 4, characterized in that, The second communication hole (430) penetrates the wall surface of the upper valve body (110), and the opening of the second communication hole (430) is sealed by a plug.

6. The valve body component according to claim 1, characterized in that, The centerline of the third balance hole (115) is perpendicular to the axis of the valve body component (100).

7. The valve body component according to claim 6, characterized in that, The third balance hole (115) penetrates the wall surface of the upper valve body (110), and the opening of the third balance hole (115) is sealed by a plug.

8. The valve body component according to any one of claims 1-7, characterized in that, It further includes a sealing seat (130), the upper valve body (110) and the lower valve body (120) clamp the sealing seat (130), and a sealing ring (132) is provided between the outer peripheral wall of the sealing seat (130) and the inner peripheral wall of the upper valve body (110) or the lower valve body (120); the sealing seat (130) has a first valve port (131), and the inner cavity of the upper valve body (110) is communicated with the inner cavity of the lower valve body (120) through the first valve port (131).

9. The valve body component according to any one of claims 1-7, characterized in that, It further includes a gasket (140) provided between the upper valve body (110) and the lower valve body (120).

10. A three-way valve, comprising a valve body component (100) and a piston component (200), characterized in that, The valve body component (100) is the valve body component according to any one of claims 1-9, and the piston component (200) is located in the inner cavity of the upper valve body (110) and divides its inner cavity into a piston cavity (113) located above and a lower cavity located below.

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