Valve seat assembly and production method of reversing valve

Abstract

The invention relates to the technical field of valves, in particular to a valve seat assembly and a production method of a reversing valve. The production method of the valve seat assembly comprises the following steps that the valve seat is provided; a sealing seat is formed on the valve seat through injection molding. According to the production method of the valve seat assembly, the sealing seat is formed on the valve seat through injection molding, so that the sealing seat and the valve seat form a whole, the process is simple and easy to implement, and due to the fact that the sealing seat is made of plastic, high surface flatness is easy to obtain, and the sealing requirement is met. When the valve seat assembly is used, the valve seat assembly produced through the production method of the valve seat assembly is installed on a valve body of a reversing valve, when sealing is formed between the sealing seat and the opening end face of the sliding block in the valve body, the sliding block can stably and smoothly slide on the surface of the sealing seat, shaking or abnormal sound is not prone to occurring, and the abrasion degree is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of valve technology, and in particular to a production method of a valve seat assembly and a reversing valve. Background Art

[0002] Reversing valves, such as four-way valves, are commonly used in refrigeration systems to change the flow direction of the refrigerant and switch between the cooling mode and the heating mode. In the related art, the reversing valve includes a valve body, a valve seat and a slider. The slider moves back and forth in the valve cavity of the valve body, and a seal needs to be formed between the open end face of the slider and the valve seat. The existing valve seat is made of metal, and it is difficult to improve the flatness and difficult to process. As a result, the flatness of the metal surface where the valve seat and the slider contact is difficult to meet the sealing requirements, which causes the slider to shake or make abnormal noises during movement, increasing the degree of wear. Summary of the invention

[0003] The purpose of the present disclosure is to provide a valve seat assembly, a reversing valve and a production method of the valve seat assembly and the reversing valve, so as to alleviate the technical problem in the prior art that the flatness of the metal surface where the existing valve seat contacts the slider is difficult to meet the sealing requirements, which causes the slider to shake or make abnormal noises during movement, thereby increasing the degree of wear.

[0004] Based on the above purpose, the present disclosure provides a valve seat assembly, including a valve seat and a sealing seat, wherein the valve seat is used to be connected to the valve body, the sealing seat is made of plastic, the sealing seat is integrated with the valve seat by injection molding, and the sealing seat is used to form a seal with the open end face of the slider.

[0005] In one embodiment of the present disclosure, the valve seat assembly further includes an inlet and outlet pipe; the valve seat is provided with a through hole, and the inlet and outlet pipes are fixedly mounted on the valve seat and communicated with the through hole.

[0006] In one embodiment of the present disclosure, the outer surfaces of the valve seat and the sealing seat include an upper surface, a lower surface and a circumferential outer surface arranged around the upper surface and the lower surface, the upper surface is the surface of the sealing seat away from the valve seat, and the upper surface is a plane; the lower surface is the surface of the valve seat away from the sealing seat; the through hole passes through the upper surface and the lower surface.

[0007] In one embodiment of the present disclosure, the upper surface is parallel to the lower surface.

[0008] In one embodiment of the present disclosure, the valve seat is provided with a reinforcement portion, and a surface of the reinforcement portion is in contact with the sealing seat.

[0009] In one embodiment of the present disclosure, the valve seat has a first surface and a second surface that are relatively arranged, and a circumferential surface that is arranged around the first surface and the second surface, and the reinforcement portion includes a first reinforcement portion arranged on the first surface of the valve seat, and / or the reinforcement portion includes a second reinforcement portion arranged on the circumferential surface of the valve seat.

[0010] In one embodiment of the present disclosure, the reinforcement portion includes at least one of a blind hole, a through groove, an annular groove and a protrusion.

[0011] Based on the above purpose, the present disclosure also provides a reversing valve, including a valve body assembly, a slider and the valve seat assembly; the valve body assembly includes a valve body, the valve body has a valve cavity, and the slider is slidably installed in the valve cavity; the valve seat is fixedly connected to the valve body, and a seal is formed between the sealing seat and the open end face of the slider.

[0012] In one embodiment of the present disclosure, the valve body assembly also includes an inlet connecting pipe, the valve body has a mounting hole connected to the valve cavity, the inlet connecting pipe is fixedly connected to the valve body, and the inlet connecting pipe is connected to the valve cavity; the valve seat is inserted into the mounting hole, and the circumferential surface of the valve seat is fixedly connected to the hole wall of the mounting hole.

[0013] In one embodiment of the present disclosure, the circumferential surface of the valve seat is welded to the hole wall of the mounting hole.

[0014] In one embodiment of the present disclosure, the projection shape of the mounting hole in a plane perpendicular to the depth direction of the mounting hole is a rectangle, a rounded rectangle or an oblong, and the valve seat has at least one cross-sectional contour shape that matches the projection shape of the mounting hole, wherein the cross-section of the valve seat is parallel to the surface of the sealing seat away from the valve seat.

[0015] In one embodiment of the present disclosure, the slider is made of metal or alloy.

[0016] Based on the above purpose, the present disclosure also provides a method for producing a valve seat assembly, comprising the following steps:

[0017] Provide valve seats;

[0018] The sealing seat is formed by injection molding on the valve seat.

[0019] In one embodiment of the present disclosure, in the step of providing a valve seat, the valve seat is formed with a through hole;

[0020] Before the step of injection molding a sealing seat on the valve seat, the method further comprises:

[0021] Provide import and export control;

[0022] The inlet and outlet pipes are fixedly connected to the valve seat, wherein the inlet and outlet pipes are communicated with the through hole.

[0023] In one embodiment of the present disclosure, in the step of fixedly connecting the inlet and outlet pipes and the valve seat, furnace brazing is used to braze the inlet and outlet pipes and the valve seat.

[0024] In one embodiment of the present disclosure, in the step of providing the valve seat, the valve seat is formed with a reinforcement portion, and the reinforcement portion includes at least one of a blind hole, a through groove, an annular groove and a protrusion.

[0025] Based on the above purpose, the present disclosure also provides a production method of a reversing valve, comprising the following steps:

[0026] A valve body assembly, a valve seat assembly and a slider are provided; wherein the valve body assembly provided comprises a valve body, and the valve body has a valve cavity; the valve seat assembly provided is prepared by adopting the production method of the valve seat assembly;

[0027] The slider is slidably installed in the valve cavity of the valve body assembly;

[0028] The valve seat assembly is fixedly mounted on the valve body, wherein a seal is formed between the sealing seat and the open end surface of the slider.

[0029] In one embodiment of the present disclosure, in the step of providing the valve body assembly, a mounting hole is formed on the valve body, and the mounting hole is communicated with the valve cavity;

[0030] The step of fixedly installing the valve seat assembly on the valve body includes: inserting the valve seat in the valve seat assembly into the mounting hole, and fixedly connecting the circumferential surface of the valve seat to the hole wall of the mounting hole.

[0031] In one embodiment of the present disclosure, in the step of fixedly connecting the circumferential surface of the valve seat and the hole wall of the mounting hole, the circumferential surface of the valve seat and the hole wall of the mounting hole are welded by laser welding.

[0032] In one embodiment of the present disclosure, the provided valve body assembly further includes an inlet pipe, which is fixedly connected to the valve body, wherein the inlet pipe is in communication with the valve cavity.

[0033] In one embodiment of the present disclosure, in the step of fixedly connecting the inlet pipe to the valve body, furnace brazing is used to braze the inlet pipe to the valve body.

[0034] In one embodiment of the present disclosure, in the step of providing a slider, the slider is made of metal or alloy.

[0035] The beneficial effects of the present disclosure are mainly:

[0036] The production method of the valve seat assembly provided by the present disclosure forms a sealing seat by injection molding on the valve seat, so that the sealing seat and the valve seat form an integral whole. The process is simple and easy to implement. Since the material of the sealing seat is plastic, it is easy to obtain a high surface flatness, thereby meeting the sealing requirements. When in use, the valve seat assembly produced by the production method of the valve seat assembly provided by the present disclosure is installed on the valve body of the reversing valve. When a seal is formed between the sealing seat and the open end face of the slider in the valve body, the slider can slide smoothly and steadily on the surface of the sealing seat, and is not prone to shaking or abnormal noise, thereby reducing the degree of wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of the structure of a valve seat assembly provided in an embodiment of the present disclosure;

[0039] Figure 2 Another structural schematic diagram of a valve seat assembly provided in an embodiment of the present disclosure;

[0040] Figure 3 A schematic diagram of the structure of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure;

[0041] Figure 4 Another structural schematic diagram of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure;

[0042] Figure 5 A third structural schematic diagram of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure;

[0043] Figure 6 for Figure 5 A front view of the valve seat is shown;

[0044] Figure 7 A fourth structural schematic diagram of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure;

[0045] Figure 8 for Figure 7 A front view of the valve seat is shown;

[0046] Fig. 9 for Figure 8 A partial enlarged view of the middle A;

[0047] Fig.10 A schematic diagram of the valve seat assembly and the slider provided in the embodiment of the present disclosure cooperating with each other;

[0048] Fig.11 A schematic diagram of the structure of a reversing valve provided in an embodiment of the present disclosure;

[0049] Fig.12 A schematic diagram of the internal structure of a reversing valve provided in an embodiment of the present disclosure;

[0050] Fig.13 A schematic structural diagram of a valve body assembly in a reversing valve provided in an embodiment of the present disclosure;

[0051] Fig.14 It is a structural schematic diagram of the valve body in the embodiment of the present disclosure;

[0052] Fig.15 is a schematic structural diagram of a slider in an embodiment of the present disclosure;

[0053] Fig.16 A flow chart of a method for producing a valve seat assembly provided by an embodiment of the present disclosure;

[0054] Fig.17 Another flow chart of a method for producing a valve seat assembly provided by an embodiment of the present disclosure;

[0055] Fig.18 Based on Fig.17 A schematic structural diagram of the valve seat assembly prepared in step S1038 in the state where the sealing seat is not formed by injection molding;

[0056] Fig.19 For Fig.18 A schematic diagram of a sealing seat formed by injection molding based on the structure shown;

[0057] Fig. 20 A flow chart of a method for producing a reversing valve provided in an embodiment of the present disclosure.

[0058] The following are the descriptions of the reference numerals:

[0059] 1-valve seat assembly; 1a-upper surface; 11-valve seat; 11b-first surface; 111-through hole; 112-first reinforcement portion; 113-second reinforcement portion; 12-sealing seat; 13-S pipe; 14-E pipe; 15-C pipe; 16-S short pipe; 17-copper sleeve; 2-slider; 21-flange; 3-valve body assembly; 31-valve body; 311-mounting hole; 312-interface; 32-D pipe; 33-D short pipe; 34-E short pipe; 35-C short pipe. DETAILED DESCRIPTION

[0060] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0061] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0063] In a first aspect, this embodiment provides a valve seat assembly 1. Figure 1 As shown, the valve seat assembly 1 provided in this embodiment includes a valve seat 11 and a sealing seat 12. The valve seat 11 is used to be connected to the valve body 31. The sealing seat 12 is made of plastic. The sealing seat 12 is integrated with the valve seat 11 by injection molding. The sealing seat 12 is used to form a seal with the open end face of the slider 2.

[0064] The valve seat assembly provided in this embodiment integrates the sealing seat 12 and the valve seat 11 into one body by injection molding. The injection molding process is simple and easy. Since the sealing seat 12 is made of plastic, it is easy to obtain a high surface flatness, thereby meeting the sealing requirements. When in use, the valve seat assembly provided in this embodiment is installed on the valve body 31 of the reversing valve. When a seal is formed between the sealing seat 12 and the open end face of the slider 2 in the valve body 31, the slider 2 can slide smoothly and steadily on the surface of the sealing seat 12, and is not prone to shaking or abnormal noise, thereby reducing the degree of wear.

[0065] In one embodiment, the valve seat assembly 1 further includes an inlet and outlet pipe; see Figure 3As shown, the valve seat 11 is provided with a through hole 111 , and the inlet and outlet pipes are fixedly mounted on the valve seat 11 and communicated with the through hole 111 .

[0066] The inlet and outlet pipes include pipes of different numbers. When the valve seat assembly is applied to different types of reversing valves, the composition of the inlet and outlet pipes is also different. In this embodiment, the reversing valve is a four-way valve as an example, that is, the valve seat assembly is applied to the four-way valve as an example, and the technical solution of this embodiment is described in detail.

[0067] See also Figure 2 As shown, the inlet and outlet pipes include an S pipe 13, an E pipe 14 and a C pipe 15. The S pipe 13 is located between the E pipe 14 and the C pipe 15, and the S pipe 13 corresponds to the inlet pipe of the four-way valve.

[0068] The valve seat 11 is provided with three through holes 111 , which are spaced apart along the length direction of the valve seat 11 , one end of the S pipe 13 is welded to the middle through hole 111 , and the E pipe 14 and the C pipe 15 are respectively welded to the through holes 111 at both ends.

[0069] In one embodiment, the valve seat assembly includes an S short pipe 16 for connecting to a capillary tube of a pilot valve of a four-way valve. Exemplarily, the S short pipe 16 is welded and fixed to the S pipe 13 and communicates with each other.

[0070] In one embodiment, see Figure 2 As shown, the valve seat assembly further includes a copper sleeve 17 connected to the S pipe 13, the E pipe 14 and the C pipe 15 respectively.

[0071] In one embodiment, the outer surfaces of the valve seat 11 and the sealing seat 12 include an upper surface 1a, a lower surface, and a circumferential outer surface arranged around the upper surface 1a and the lower surface, the upper surface 1a is the surface of the sealing seat 12 away from the valve seat 11, and the upper surface 1a is a smooth plane; the lower surface is the surface of the valve seat 11 away from the sealing seat 12; the through hole 111 runs through the upper surface 1a and the lower surface.

[0072] Exemplarily, the integrated valve seat 11 and the sealing seat 12 are plate-shaped or block-shaped as a whole, and their outer surfaces include an upper surface 1a, a lower surface and a circumferential outer surface arranged around the upper surface 1a and the lower surface. The upper surface 1a is the surface of the sealing seat 12 away from the valve seat 11, and the upper surface 1a is a smooth plane. After the valve seat assembly is installed in the valve body, the upper surface 1a faces the valve body, and a seal is formed between the upper surface 1a and the open end face of the slider 2; the lower surface is the surface of the valve seat 11 away from the sealing seat 12; the circumferential outer surface includes the circumferential surface of the valve seat 11 and the circumferential surface of the sealing seat 12.

[0073] In order to ensure the corresponding communication relationship between the S pipe 13, the E pipe 14, the C pipe 15 and the valve cavity, the through hole 111 passes through the upper surface 1a and the lower surface, that is, when the sealing seat 12 is injection molded, the through hole 111 will not be blocked by the injection molding material.

[0074] For example, see Figure 3 As shown, before the sealing seat is formed by injection molding, a through hole 111 has been formed on the valve seat 11, so as to avoid damage to the sealing seat structure caused by machining the through hole after injection molding.

[0075] During the movement of slider 2, see Fig.10 As shown, a seal is formed between the open end surface of the slider 2 and the sealing seat 12. In order to enhance the sealing effect, the upper surface 1a is a smooth plane.

[0076] In one embodiment, the upper surface 1a is parallel to the lower surface, which ensures that the thickness of the edge and the middle of the valve seat 11 are substantially equal, thereby improving the anti-deformation ability of the valve seat 11. At the same time, the lower surface is a plane, which is easy to process and does not need to be processed into a circular arc surface that matches the inner wall of the valve cavity.

[0077] It should be noted that, in this embodiment, “the upper surface 1 a is parallel to the lower surface” means that the upper surface 1 a is substantially parallel to the lower surface within an allowable error range.

[0078] Exemplarily, the valve seat 11 and the sealing seat 12 integrated into one body are in the shape of a rectangular plate or block with equal thickness, and the circumferential outer surface is perpendicular to the lower surface.

[0079] It should be understood that the shape of the projection of the circumferential outer surface in the plane where the lower surface is located in this embodiment can be, but is not limited to, a rectangle, a rounded rectangle, or an oblong.

[0080] In one embodiment, the valve seat 11 is provided with a reinforcement portion, and a surface of the reinforcement portion is in contact with the sealing seat 12 .

[0081] By providing the reinforcement part, the injection connection strength between the sealing seat 12 and the valve seat 11 can be enhanced to prevent the sealing seat 12 from being separated from the valve seat 11. Exemplarily, the reinforcement part includes at least one of a blind hole, a through groove, an annular groove and a protrusion.

[0082] In one embodiment, see Figures 4 to 9 As shown, the valve seat 11 has a first surface 11b and a second surface arranged opposite to each other, and a circumferential surface arranged around the first surface 11b and the second surface. The reinforcement portion includes a first reinforcement portion 112 arranged on the first surface 11b of the valve seat 11, and / or the reinforcement portion includes a second reinforcement portion 113 arranged on the circumferential surface of the valve seat 11.

[0083] Specifically, the first surface 11b is the surface of the valve seat 11 close to the sealing seat 12. After injection molding, the first surface 11b is covered by the sealing seat 12. The second surface is the surface of the valve seat 11 away from the sealing seat 12, that is, the second surface is the lower surface.

[0084] In a possible design, the reinforcement portion includes a first reinforcement portion 112 disposed on the first surface 11b of the valve seat 11. The number of the first reinforcement portion 112 may be one or more.

[0085] For example, see Figure 4 As shown, the first reinforcement portion 112 may be a blind hole. It should be understood that the blind hole may be provided at a portion other than the edge of the first surface 11b, for example, the outline of the blind hole may be circular, rectangular, or elliptical; the blind hole may also be provided at the edge of the first surface 11b to form a notch, for example, the blind hole is a semicircular notch.

[0086] For example, the first reinforcement portion 112 may also be a through groove, for example, see Figure 5 As shown, a through groove is provided between each of two adjacent through holes 111, the length direction of the through groove is perpendicular to the line connecting the centers of the two adjacent through holes 111, and both ends of the through groove in the length direction penetrate the circumferential surface of the valve seat 11. For example, see Figure 6 As shown, the through slot is a T-shaped slot. Of course, the through slot can also be a straight slot or a dovetail slot.

[0087] Exemplarily, the first reinforcement portion 112 may also be an annular groove or a protrusion.

[0088] It should be noted that the first reinforcement portion 112 may include a blind hole, a through groove, an annular groove and a protrusion.

[0089] In another possible design, the reinforcement portion includes a first reinforcement portion 112 disposed on the first surface 11 b of the valve seat 11 and a second reinforcement portion 113 disposed on the circumferential surface of the valve seat 11 .

[0090] For example, see Figures 7 to 9 As shown, the first reinforcement portion 112 is a first annular groove disposed on the edge of the first surface 11 b , and the second reinforcement portion 113 is a second annular groove disposed on the circumferential surface, and the first annular groove is connected to the second annular groove.

[0091] In a third possible design, the reinforcement portion may also be only the second reinforcement portion 113 provided on the circumferential surface of the valve seat 11 .

[0092] In a second aspect, this embodiment also provides a reversing valve, see Fig.11 and Fig.12As shown, the reversing valve includes a valve body assembly 3, a slider 2 and a valve seat assembly 1 provided in this embodiment; the valve body assembly 3 includes a valve body 31, the valve body 31 has a valve cavity, and the slider 2 is slidably installed in the valve cavity; the valve seat 11 is fixedly connected to the valve body 31, and a seal is formed between the sealing seat 12 and the open end face of the slider 2.

[0093] The reversing valve provided in this embodiment uses the valve seat assembly provided in this embodiment, and the sealing seat 12 is made of plastic, which can easily obtain a high surface flatness, thereby meeting the sealing requirements. When in use, the slider 2 can slide smoothly on the surface of the sealing seat 12, and is not prone to shaking or abnormal noise, thereby reducing the degree of wear and tear and increasing the service life of the reversing valve.

[0094] The technical solution of this embodiment is described in detail below by taking the reversing valve being a four-way valve as an example.

[0095] In one embodiment, the valve body assembly also includes an inlet pipe, the valve body 31 has a mounting hole 311 connected to the valve cavity, the inlet pipe is fixedly connected to the valve body 31, and the inlet pipe is connected to the valve cavity; the valve seat 11 is inserted into the mounting hole 311, and the circumferential surface of the valve seat 11 is fixedly connected to the hole wall of the mounting hole 311.

[0096] Exemplarily, the inlet pipe is fixedly connected to the valve body 31, the inlet and outlet pipes are fixedly mounted on the valve seat 11 and connected to the through hole 111, a sealing seat 12 is injection molded on the valve seat 11 on which the inlet and outlet pipes are fixedly mounted, the valve seat 11 is inserted into the mounting hole 311, and the circumferential surface of the valve seat 11 is fixedly connected to the hole wall of the mounting hole 311.

[0097] For the four-way valve, the inlet pipe is a D pipe 32 , which is installed on the interface 312 of the valve body 31 on the side away from the mounting hole 311 , and the position of the D pipe 32 corresponds to that of the S pipe 13 .

[0098] The slider 2 can move in the valve cavity to switch between different flow paths. Fig.12 When the end of the valve body 31 is close to the E pipe 14, the D pipe 32 is connected to the C pipe 15, and the E pipe 14 is connected to the S pipe 13. Fig.12 In the position shown, the D pipe 32 is connected to the E pipe 14 , and the C pipe 15 is connected to the S pipe 13 .

[0099] In one embodiment, the four-way valve further includes a pilot valve (not shown in the figure), see Fig.13As shown, the valve body assembly includes a D short pipe 33, an E short pipe 34 and a C short pipe 35 for connecting to the capillary of the pilot valve, wherein the D short pipe 33 is welded and fixed to the D pipe 32 and connected, the E short pipe 34 is welded and fixed to the end of the valve body 31 close to the E pipe 14 and connected, and the C short pipe 35 is welded and fixed to the end of the valve body 31 close to the C pipe 15 and connected.

[0100] In one embodiment, see Fig.13 As shown, the valve body assembly further includes a copper sleeve 17 connected to one end of the D-type pipe 32 .

[0101] In one embodiment, the circumferential surface of the valve seat 11 is welded to the hole wall of the mounting hole 311 .

[0102] In some embodiments, laser welding is used to weld the circumferential surface of the valve seat 11 and the hole wall of the mounting hole 311 .

[0103] In one embodiment, see Fig.14 As shown, the valve body 31 is a tubular structure, the projection shape of the mounting hole 311 in a plane perpendicular to the depth direction of the mounting hole 311 is a rectangle, a rounded rectangle or an oblong, and the valve seat 11 has at least one cross-sectional contour shape that matches the projection shape of the mounting hole 311, wherein the cross-section of the valve seat 11 is parallel to the surface of the sealing seat 12 away from the valve seat 11.

[0104] In this embodiment, see Figure 1 and Figure 3 As shown, the valve seat 11 is a rectangular plate or block structure of equal thickness, and the circumferential surface of the valve seat 11 is perpendicular to the second surface of the valve seat 11, and the cross section of the valve seat 11 is parallel to the upper surface 1a. Therefore, the contour shape of each cross section of the valve seat 11 is adapted to the projection shape of the mounting hole 311.

[0105] Exemplarily, the cross section of the valve seat 11 is perpendicular to the depth direction of the through hole 111 .

[0106] It should be understood that the contour shapes of the cross sections at different positions of the valve seat 11 may also be different. When the valve seat 11 is aligned with the mounting hole 311 and inserted at a certain position in the mounting hole 311, it is sufficient as long as the contour shape of the cross section at the position corresponding to the mounting hole 311 is compatible with the projected shape of the mounting hole 311, so as to facilitate the welding and sealing of the valve seat 11 and the valve body 31.

[0107] It should be noted that the shape of the valve seat 11 may be determined according to the shape of the mounting hole 311 , or the shape of the mounting hole 311 may be determined according to the shape of the valve seat 11 .

[0108] In one embodiment, see Fig.15As shown, the slider 2 is a shell with an opening, and the edge of the opening is provided with a flange 21, and the flange 21 contacts the sealing seat 12 to form a sliding seal.

[0109] In one embodiment, the slider 2 is made of metal or alloy. Since the sealing seat 12 is made of plastic, the slider 2 can be made of metal or alloy. Compared with the slider 2 made of plastic, the slider 2 made of metal or alloy in this embodiment has stronger structural strength and is not easy to break.

[0110] Exemplarily, the material of the slider 2 may be stainless steel, aluminum, copper or brass.

[0111] It should be noted that the material of the slider 2 is not limited to metal or alloy, as long as it can meet the strength requirements.

[0112] In a third aspect, this embodiment further provides a method for producing a valve seat assembly, comprising the following steps:

[0113] Providing a valve seat 11;

[0114] A sealing seat 12 is formed on the valve seat 11 by injection molding.

[0115] The production method of the valve seat assembly provided in this embodiment forms the sealing seat 12 by injection molding on the valve seat 11, so that the sealing seat 12 and the valve seat 11 form an integral body. The process is simple and easy to implement. Since the material of the sealing seat 12 is plastic, it is easy to obtain a high surface flatness, thereby meeting the sealing requirements. When in use, the valve seat assembly produced by the production method of the valve seat assembly provided in this embodiment is installed on the valve body 31 of the reversing valve. When a seal is formed between the sealing seat 12 and the open end face of the slider 2 in the valve body 31, the slider 2 can slide smoothly and steadily on the surface of the sealing seat 12, and is not prone to shaking or abnormal noise, thereby reducing the degree of wear.

[0116] Illustratively, the method for producing the valve seat assembly provided in this embodiment is used to produce the valve seat assembly provided in this embodiment.

[0117] The production method of the valve seat assembly provided in this embodiment is described in detail below by taking a valve seat assembly of a four-way valve as an example.

[0118] See also Fig.16 As shown, the production method of the valve seat assembly provided in this embodiment includes the following steps:

[0119] Step S102, providing a valve seat 11.

[0120] Step S104 , forming a sealing seat 12 on the valve seat 11 by injection molding.

[0121] In step S104, an injection molding device is used to injection-mold the valve seat 11 to form a sealing seat 12. The injection molding device is a prior art, and a suitable injection molding cavity can be selected according to actual production and processing requirements.

[0122] according to Fig.16 The structure of the valve seat assembly prepared in step S104 is as follows: Figure 1 shown.

[0123] In one embodiment, in step S102 , a through hole 111 is formed on the valve seat 11 . Exemplarily, the through hole 111 is processed on the plate-shaped or block-shaped valve seat 11 , and the processing technology is prior art.

[0124] For example, see Figure 3 As shown, three through holes 111 are processed on the valve seat 11 , and the three through holes 111 are arranged at intervals along the length direction of the valve seat 11 .

[0125] Before performing step S104, the method further includes:

[0126] Step S1032 , providing import and export pipes. Exemplarily, the import and export pipes include an S pipe 13 , an E pipe 14 and a C pipe 15 .

[0127] Step S1034, the inlet and outlet pipes are fixedly connected to the valve seat 11, wherein the inlet and outlet pipes are connected to the through hole 111. Specifically, the S pipe 13 is located between the E pipe 14 and the C pipe 15, one end of the S pipe 13 is welded to the middle through hole 111, and the E pipe 14 and the C pipe 15 are respectively welded to the through holes 111 at both ends.

[0128] In one embodiment, in the step of fixing the inlet and outlet pipes and the valve seat 11 , furnace brazing is used to braze the inlet and outlet pipes and the valve seat 11 .

[0129] Specifically, in step S1034 , the S pipe 13 , the E pipe 14 , and the C pipe 15 are brazed to their corresponding through holes 111 by furnace brazing.

[0130] In one embodiment, before performing step S104, the method further includes:

[0131] Step S1036 , providing a short pipe; illustratively, the short pipe in the valve seat assembly includes an S short pipe 16 .

[0132] Step S1038, brazing the short pipe, the inlet and outlet pipes and the valve seat 11 by furnace brazing.

[0133] Specifically, the S pipe 13, the E pipe 14 and the C pipe 15 are respectively installed in the corresponding through holes 111, the S short pipe 16 is installed in the corresponding position of the S pipe 13, and then put into the brazing furnace together for brazing, which can improve production efficiency.

[0134] It should be noted that the ends of the S pipe 13, the E pipe 14 and the C pipe 15 of the four-way valve are also connected with copper sleeves 17 respectively. Each copper sleeve 17 can be installed on one end of the S pipe 13, the E pipe 14 and the C pipe 15 respectively, and then put into the brazing furnace together for brazing, which can further improve production efficiency.

[0135] Of course, the short pipe and the copper sleeve 17 can also be welded separately.

[0136] Fig.18 Based on Fig.17 A schematic diagram of the structure of the valve seat assembly prepared in step S1038 in the state where the sealing seat is not formed by injection molding. Fig.18 As shown, the valve seat 11 has not yet been injection molded to form a sealing seat, that is, Fig.17 In step S104 of Fig.18 The structure shown is based on injection molding. Fig.19 As shown, Fig.18 The structure shown is placed in an injection molding device, and a sealing seat 12 is formed by injection molding on the valve seat 11. After injection molding, the valve seat assembly obtained is as follows: Figure 2 shown.

[0137] After the valve seat 11, the S pipe 13, the E pipe 14, the C pipe 15, the S short pipe 16 and the copper sleeve 17 are brazed, the sealing seat 12 is injection molded on the valve seat 11 to prevent the sealing seat 12 from being melted by the high temperature in the brazing furnace.

[0138] In one embodiment, in step S102, a reinforcement portion is formed on the valve seat 11. Exemplarily, the reinforcement portion includes a first reinforcement portion 112 formed on the first surface 11b of the valve seat 11, and / or a second reinforcement portion 113 formed on the circumferential surface of the valve seat 11. Exemplarily, the reinforcement portion includes at least one of a blind hole, a through groove, an annular groove, and a protrusion.

[0139] Please refer to the structure and layout of the reinforcement again. Figures 4 to 9 , I will not go into details here.

[0140] It should be noted that the processing sequence of the through hole 111 and the reinforcement portion on the valve seat 11 can be selected according to actual production and processing requirements.

[0141] In a fourth aspect, this embodiment further provides a method for producing a reversing valve, comprising the following steps:

[0142] A valve body assembly 3, a valve seat assembly 1 and a slider 2 are provided; wherein the valve body assembly 3 provided includes a valve body 31, and the valve body 31 has a valve cavity; the valve seat assembly 1 provided is prepared by the production method of the valve seat assembly provided in this embodiment;

[0143] The slider 2 is slidably installed in the valve cavity of the valve body assembly;

[0144] The valve seat assembly is fixedly mounted on the valve body 31 , wherein a seal is formed between the sealing seat 12 and the open end surface of the slider 2 .

[0145] The production method of the reversing valve provided in this embodiment is simple and easy to implement because the valve seat assembly provided is prepared by the production method of the valve seat assembly provided in this embodiment, so that the sealing seat 12 and the valve seat 11 are injection molded into a whole, and the material of the sealing seat 12 is plastic, and a high surface flatness is easily obtained, thereby meeting the sealing requirements. When in use, the slider 2 can slide smoothly and steadily on the surface of the sealing seat 12, and is not prone to shaking or abnormal noise, thereby reducing the degree of wear and tear and increasing the service life of the reversing valve.

[0146] Illustratively, the method for producing the reversing valve provided in this embodiment is used to produce the reversing valve provided in this embodiment.

[0147] The following takes a four-way valve as an example to describe in detail the production method of the reversing valve provided in this embodiment.

[0148] See also Fig. 20 As shown, the production method of the reversing valve provided in this embodiment includes the following steps:

[0149] Step S202, providing a valve body assembly 3, a valve seat assembly 1 and a slider 2; wherein the provided valve body assembly 3 includes a valve body 31, and the valve body 31 has a valve cavity; the provided valve seat assembly 1 is prepared by the production method of the valve seat assembly provided in this embodiment.

[0150] Exemplarily, the valve body 31 is a circular tubular structure with covers (not shown in the figure) at both ends, and the inner cavity of the circular tubular structure is a valve cavity.

[0151] Exemplarily, the valve seat assembly provided is provided using Fig.17 The valve seat assembly is prepared by the production method shown.

[0152] Step S204, slidably installing the slider 2 in the valve cavity of the valve body assembly.

[0153] Exemplarily, the slider 2 is rotated into the valve cavity from one end of the valve body 31. Since the sealing seat 12 is made of plastic, such as nylon or polyphenylene sulfide (PPS), the slider 2 provided in this embodiment can be made of metal or alloy. The slider 2 made of metal or alloy has a strong structural strength and is not easy to break during use.

[0154] Step S206 , fixing the valve seat assembly to the valve body 31 , wherein a seal is formed between the sealing seat 12 and the open end surface of the slider 2 .

[0155] For example, see Fig.15 As shown, the edge of the opening of the slider 2 is provided with a flange 21 , and the flange 21 contacts the sealing seat 12 to form a sliding seal.

[0156] In one embodiment, in the step of providing a valve body assembly, referring to Fig.14 As shown, a mounting hole 311 is formed on the valve body 31, and the mounting hole 311 is communicated with the valve cavity; the provided valve body assembly also includes an inlet pipe, which is fixedly connected to the valve body 31, wherein the inlet pipe is communicated with the valve cavity.

[0157] Specifically, the shape of the projection of the mounting hole 311 in a plane perpendicular to the depth direction of the mounting hole 311 can be a rectangle, a rounded rectangle, or an oblong. Fig.14 As shown, the valve body 31 is processed with an interface 312, which is illustratively opposite to the mounting hole 311 and communicates with the valve cavity. The inlet pipe is a D pipe 32, which is fixedly installed at the interface 312.

[0158] In one embodiment, in the step of fixing the inlet pipe to the valve body 31 , furnace brazing is used to braze the inlet pipe to the valve body 31 .

[0159] Specifically, the D-type pipe 32 and the interface 312 on the valve body 31 are brazed by furnace brazing.

[0160] In one embodiment, in the step of providing the valve body assembly, the provided valve body assembly further includes a short pipe; the short pipe, the inlet pipe and the valve body 31 are brazed by furnace brazing.

[0161] Specifically, the four-way valve also includes a pilot valve (not shown in the figure), see Fig.13 As shown, the short pipes in the valve body assembly include a D short pipe 33 , an E short pipe 34 and a C short pipe 35 .

[0162] Specifically, the D pipe 32 is installed at the interface 312 of the valve body 31, the D short pipe 33 is installed at the corresponding position of the D pipe 32, the E short pipe 34 is installed at the end of the valve body 31 close to the E pipe 14, and the C short pipe 35 is installed at the end of the valve body 31 close to the C pipe 15, and then they are put into the brazing furnace together for brazing, which can improve production efficiency.

[0163] It should be noted that see Fig.13 As shown, the end of the D-type pipe 32 of the four-way valve is also connected to a copper sleeve 17. The copper sleeve 17 can be installed on one end of the D-type pipe 32, and then put into a brazing furnace for brazing together, which can further improve production efficiency.

[0164] In one embodiment, the step of fixing the valve seat assembly to the valve body 31 includes: inserting the valve seat 11 in the valve seat assembly into the mounting hole 311 , and fixing the circumferential surface of the valve seat 11 to the hole wall of the mounting hole 311 .

[0165] For example, we will use Fig.17 The valve seat 11 in the valve seat assembly prepared by the production method of the valve seat assembly shown is inserted into the mounting hole 311 , and the circumferential surface of the valve seat 11 is fixedly connected to the hole wall of the mounting hole 311 .

[0166] In this embodiment, the valve seat assembly and the valve body assembly are brazed in a furnace respectively, so a brazing furnace with a smaller furnace opening can be selected.

[0167] In one embodiment, in the step of fixedly connecting the circumferential surface of the valve seat 11 and the hole wall of the mounting hole 311 , the circumferential surface of the valve seat 11 and the hole wall of the mounting hole 311 are welded by laser welding.

[0168] Specifically, the brazed valve seat assembly and valve body assembly are taken out from the brazing furnace, the valve seat 11 in the valve seat assembly is inserted into the mounting hole 311, and the circumferential surface of the valve seat 11 and the hole wall of the mounting hole 311 are welded by laser welding.

[0169] In actual production, after the brazing-finished valve seat assembly and valve body assembly are taken out of the brazing furnace, the valve seat assembly and the valve body assembly can be inspected first. If there is a problem with the welding quality, since the flow welding position of each pipe is generally the joint between the pipe and the valve seat 11, there is a large space for grinding and easy rework; if the surface of the valve seat 11 is deformed, it can also be measured by tools such as a knife edge ruler, and the surface solder can be ground off with a grinding wheel, electric grinder or file to achieve the purpose of rework and repair.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for producing a valve seat assembly, characterized in that: The following steps are involved: Provide valve seats; The sealing seat is formed by injection molding on the valve seat.

2. The method for producing a valve seat assembly according to claim 1, characterized in that: In the step of providing a valve seat, the valve seat is formed with a through hole; Before the step of injection molding a sealing seat on the valve seat, the method further comprises: Provide import and export control; The inlet and outlet pipes are fixedly connected to the valve seat, wherein the inlet and outlet pipes are communicated with the through hole.

3. The method for producing a valve seat assembly according to claim 2, characterized in that: In the step of fixedly connecting the inlet and outlet pipes and the valve seat, the inlet and outlet pipes and the valve seat are brazed by furnace brazing.

4. The method for producing a valve seat assembly according to any one of claims 1 to 3, characterized in that: In the step of providing a valve seat, a reinforcement portion is formed on the valve seat, and the reinforcement portion includes at least one of a blind hole, a through groove, an annular groove and a protrusion.

5. A method for producing a reversing valve, characterized in that: The following steps are involved: A valve body assembly, a valve seat assembly and a slider are provided; wherein the valve body assembly provided comprises a valve body, and the valve body has a valve cavity; the valve seat assembly provided is prepared by the production method of the valve seat assembly according to any one of claims 1 to 4; The slider is slidably installed in the valve cavity of the valve body assembly; The valve seat assembly is fixedly mounted on the valve body, wherein a seal is formed between the sealing seat and the open end surface of the slider.

6. The method for producing a reversing valve according to claim 5, characterized in that: In the step of providing the valve body assembly, a mounting hole is formed on the valve body, and the mounting hole is communicated with the valve cavity; The step of fixedly installing the valve seat assembly on the valve body includes: inserting the valve seat in the valve seat assembly into the mounting hole, and fixedly connecting the circumferential surface of the valve seat to the hole wall of the mounting hole.

7. The method for producing a reversing valve according to claim 6, characterized in that: In the step of fixedly connecting the circumferential surface of the valve seat and the hole wall of the mounting hole, the circumferential surface of the valve seat and the hole wall of the mounting hole are welded by laser welding.

8. The method for producing a reversing valve according to claim 5, characterized in that: The provided valve body assembly further comprises an inlet pipe which is fixedly connected to the valve body, wherein the inlet pipe is in communication with the valve cavity.

9. The method for producing a reversing valve according to claim 8, characterized in that: In the step of fixedly connecting the inlet connecting pipe to the valve body, furnace brazing is used to braze the inlet connecting pipe to the valve body.

10. The method for producing a reversing valve according to claim 5, characterized in that: In the step of providing a slider, the slider is made of metal or alloy.

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