Directional control valve and method for manufacturing a directional control valve

Abstract

A directional control valve comprising a valve body assembly (10a) and a valve seat assembly (20a), wherein the valve body assembly (10a) includes a valve body (11a) and an inlet connecting pipe, the valve body (11a) has a valve chamber and a mounting hole (111a) communicating with the valve chamber, the inlet connecting pipe is fixedly connected to the valve body (11a) and communicates with the valve chamber, the valve seat assembly (20a) includes a valve seat (21a) and an inlet / outlet connecting pipe, the valve seat (21a) has a through hole (211a), the inlet / outlet connecting pipe is fixedly attached to the valve seat (21a) and communicates with the through hole (211a), the valve seat (21a) is inserted into the mounting hole (111a), and the circumferential surface (214a) of the valve seat (21a) is fixedly connected to the wall of the mounting hole (111a), and a method for manufacturing a directional control valve.

Description

Technical Field

[0001] This disclosure claims the priority of Chinese Patent Applications filed on June 21, 2023, with Application No. 202310750396.0 and title "Direction Switching Valve and Manufacturing Method of Direction Switching Valve", and filed on June 21, 2023, with Application No. 202310748608.1 and title "Valve Seat Assembly, Direction Switching Valve, and Manufacturing Methods of Valve Seat Assembly and Direction Switching Valve", and all the contents of this Chinese Patent Application are incorporated herein by reference.

[0002] The present invention relates to a direction switching valve and a manufacturing method of the direction switching valve.

Background Art

[0003] In a cooling system, a direction switching valve that changes the flow direction of a refrigerant, such as a four-way valve, to realize switching between a cooling mode and a heating mode, is generally used. In related technologies, the direction switching valve includes a valve body and a valve seat. The valve body has a valve chamber, and an inlet for attaching an inlet connection pipe is provided on the valve body. The cross-sectional shape of the valve seat is D-shaped, and a plurality of through holes for attaching an inlet / outlet connection pipe are provided on the valve seat. During assembly, the valve seat is incorporated into the valve chamber from one end of the valve body, the arc surface of the valve seat is brought into close contact with the chamber wall of the valve chamber, the sealing surface (the surface facing the arc surface) of the valve seat is directed toward the inlet side. At the same time, the inlet connection pipe is abutted against the inlet, the inlet / outlet connection pipe is abutted against the corresponding through hole, and finally, all components such as the assembled valve body, valve seat, inlet connection pipe, and inlet / outlet connection pipe are put into a brazing furnace together for in-furnace brazing. In such a method, the number of components in one assembly is large, the operation process is complex, and the risk of component dropout is high.

Summary of the Invention

[0004] The purpose of this disclosure is to provide a directional control valve and a method for manufacturing a directional control valve that alleviates the technical problems of the conventional technology, which include the need to assemble a conventional directional control valve by first incorporating the valve seat into the valve chamber from one end of the valve body, and then placing all the assembled parts such as the valve body, valve seat, inlet connecting pipe, and inlet / outlet connecting pipe together in a brazing furnace for furnace brazing, resulting in a large number of parts in a single assembly, a complex operating process, and a high risk of parts falling off.

[0005] According to one aspect of the present invention, this disclosure is, A directional control valve is provided, comprising a valve body assembly including a valve body and an inlet connecting pipe, the valve body having a valve chamber and a mounting hole communicating with the valve chamber, the inlet connecting pipe being fixedly connected to the valve body and communicating with the valve chamber, and a valve seat assembly including a valve seat and an inlet / outlet connecting pipe, the valve seat having a through hole, the inlet / outlet connecting pipe being fixedly attached to the valve seat and communicating with the through hole, the valve seat being inserted into the mounting hole, and the circumferential surface of the valve seat being fixedly connected to the wall of the mounting hole.

[0006] In one embodiment of the present disclosure, the valve seat has an upper surface and a lower surface, the upper surface and the lower surface being located on opposite sides of the circumferential surface of the valve seat, the lower surface facing the inside of the valve body, and the upper surface being parallel to the lower surface.

[0007] In one embodiment of the present disclosure, at least a portion of the edge to which the circumferential surface and the lower surface of the valve seat are connected is welded to the hole wall of the mounting hole.

[0008] In one embodiment of the present disclosure, the lower surface is a smooth plane.

[0009] In one embodiment of the present disclosure, the mounting hole has a projected shape in a plane perpendicular to the depth direction of the mounting hole that is rectangular, rounded rectangular, or oval, and the valve seat has a contour shape of at least one cross-section that matches the projected shape of the mounting hole, and the cross-section of the valve seat is perpendicular to the depth direction of the through hole.

[0010] In one embodiment of the present disclosure, a sealing seat and a slider are included, wherein the sealing seat is made of plastic and is integrated with the valve seat by injection molding, the slider is slidably mounted within the valve chamber, and the sealing seat is used to form a seal between itself and the open end face of the slider.

[0011] 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 an outer peripheral surface surrounding the upper surface and the lower surface, the upper surface being a flat surface of the sealing seat away from the valve seat, the lower surface being a surface of the valve seat away from the sealing seat, and the through hole penetrating the upper surface and the lower surface.

[0012] In one embodiment of this disclosure, the upper surface is parallel to the lower surface.

[0013] In one embodiment of the present disclosure, the valve seat is provided with a reinforcing portion, the surface of which contacts the sealing seat.

[0014] In one embodiment of the present disclosure, the valve seat has a first surface and a second surface provided opposite to each other, and a circumferential surface provided between the first surface and the second surface, and the reinforcing portion includes a first reinforcing portion provided on the first surface of the valve seat. and / or the reinforcing portion includes a second reinforcing portion provided on the circumferential surface of the valve seat.

[0015] In one embodiment of the present disclosure, the reinforcing portion includes at least one of a blind via hole, a through groove, an annular groove, and a projection.

[0016] In one embodiment of the present disclosure, the material of the slider is metal or an alloy.

[0017] Based on the purposes described above, this disclosure is intended to Steps for manufacturing a valve assembly, Steps for manufacturing a valve seat assembly, A method for manufacturing a directional control valve, comprising the step of fixing and attaching a valve seat assembly to a valve body assembly, The steps for manufacturing the valve assembly are: The valve body and inlet connecting pipe are provided, the valve body having a valve chamber, the valve body having a mounting hole machined into it, the mounting hole communicating with the valve chamber, This includes fixing and connecting the inlet connecting pipe to the valve body, and the inlet connecting pipe communicating with the valve chamber. The steps for manufacturing the valve seat assembly are: The valve seat and inlet / outlet connecting pipe are provided, and the valve seat has a through hole machined into it. This includes fixing and connecting the inlet / outlet connecting pipe to the valve seat, and ensuring that the inlet / outlet connecting pipe communicates with the through hole, The step of fixing and attaching the valve seat assembly to the valve body assembly is, The present invention further provides a method for manufacturing a directional control valve, which includes inserting the valve seat in the valve seat assembly into a mounting hole and fixing the circumferential surface of the valve seat to the wall of the mounting hole.

[0018] In one embodiment of the present disclosure, in the step of fixing and connecting the inlet connecting pipe to the valve body to form a valve body assembly, the inlet connecting pipe is brazed to the valve body using furnace brazing.

[0019] In one embodiment of the present disclosure, in the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat to form a valve seat assembly, the inlet / outlet connecting pipe is brazed to the valve seat using furnace brazing.

[0020] In one embodiment of the present disclosure, in the step of fixing and connecting the circumferential surface of the valve seat to the hole wall of the mounting hole, the circumferential surface of the valve seat is welded to the hole wall of the mounting hole using a laser welding method.

[0021] In one embodiment of the present disclosure, the step of manufacturing a valve assembly is: To provide a short connecting pipe, The method further includes brazing the short connecting pipe and the inlet connecting pipe to the valve body using furnace brazing.

[0022] In one embodiment of the present disclosure, the step of manufacturing a valve seat assembly is: Providing a short connection pipe, Further including brazing the short connection pipe and the inlet / outlet connection pipe to the valve seat using in-furnace brazing.

[0023] In an embodiment of the present disclosure, after the step of fixing and connecting the inlet / outlet connection pipe to the valve seat, Further including the step of injection molding a sealing seat on the valve seat.

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

[0025] In an embodiment of the present disclosure, further including the step of providing a slider and the step of slidably mounting the slider in the valve chamber of the valve body assembly, A seal is formed between the sealing seat and the open end face of the slider.

[0026] The beneficial effects of the present disclosure are mainly as follows. The direction switching valve provided by the present disclosure, after separately assembling the valve body assembly and the valve seat assembly, inserts the valve seat into the mounting hole and fixes and connects the circumferential surface of the valve seat to the hole wall of the mounting hole, reducing the number of parts in one assembly, simplifying the operation process, and reducing the risk of part dropout. Specifically, fix and connect the inlet connection pipe to the valve body, fix and mount the inlet / outlet connection pipe to the valve seat and communicate it with the through hole, insert the valve seat to which the inlet / outlet connection pipe is fixedly mounted into the mounting hole, and fix and connect the circumferential surface of the valve seat to the hole wall of the mounting hole.

Brief Description of the Drawings

[0027] The above and other features and advantages of the present invention will become more apparent by describing exemplary embodiments of the present invention in detail with reference to the accompanying drawings.

[0028] [Figure 1]This is a left side view of a conventional directional control valve. [Figure 2] This is a schematic diagram of the structure of a directional control valve provided in the embodiments of this disclosure. [Figure 3] This is a left side view of a directional control valve provided in an embodiment of the present disclosure. [Figure 4] This is a schematic diagram of the valve body structure in an embodiment of the present disclosure. [Figure 5] This is a schematic diagram of the structure of the valve assembly in an embodiment of the present disclosure. [Figure 6] This is a schematic diagram of the valve seat structure in an embodiment of the present disclosure. [Figure 7] This is a schematic diagram of the structure of a valve seat assembly in an embodiment of the present disclosure. [Figure 8] This is a flowchart of the method for manufacturing a directional control valve provided in the embodiments of this disclosure. [Figure 9] This is a schematic diagram of the structure of a valve seat assembly provided in the embodiments of this disclosure. [Figure 10] This is another schematic diagram of the valve seat assembly provided in the embodiments of the present disclosure. [Figure 11] This is a schematic diagram of the structure of a valve seat in a valve seat assembly provided in the embodiments of this disclosure. [Figure 12] This is another schematic diagram of the structure of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure. [Figure 13] This is a schematic diagram of the third structure of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure. [Figure 14] Figure 13 is a front view of the valve seat. [Figure 15] This is a fourth schematic diagram of the structure of a valve seat in a valve seat assembly provided in an embodiment of the present disclosure. [Figure 16] Figure 15 is a front view of the valve seat. [Figure 17] This is a magnified view of part A in Figure 16. [Figure 18] This is a schematic diagram illustrating the cooperation between the valve seat assembly and slider provided in the embodiments of this disclosure. [Figure 19]This is a schematic diagram of the structure of a directional control valve provided in the embodiments of this disclosure. [Figure 20] This is a schematic diagram of the internal structure of a directional control valve provided in the embodiments of this disclosure. [Figure 21] This is a schematic diagram of the structure of the valve body assembly in a directional control valve provided in the embodiments of this disclosure. [Figure 22] This is a schematic diagram of the valve body structure in an embodiment of the present disclosure. [Figure 23] This is a schematic diagram of the slider structure in an embodiment of the present disclosure. [Figure 24] This is a flowchart of the method for manufacturing a valve seat assembly provided in the embodiments of this disclosure. [Figure 25] This is another flowchart of the method for manufacturing a valve seat assembly provided in the embodiments of this disclosure. [Figure 26] This is a schematic diagram of the structure of a valve seat assembly manufactured according to step S1038 in Figure 25, in a state where the sealing seat has not been injection molded. [Figure 27] This is a schematic diagram illustrating the injection molding of a sealing seat based on the structure shown in Figure 26. [Figure 28] This is a flowchart of the method for manufacturing a directional control valve provided in the embodiments of this disclosure.

[0029] The explanation of the reference numbers is as follows: 1' Valve body, 2' D-type valve seat, 3' Slider, 10a Valve body assembly, 11a Valve body, 111a Mounting hole, 112a Connection port, 12a D-type connection pipe, 13a D-type short connection pipe, 14a E-type short connection pipe, 15a C-type short connection pipe, 16a Copper sleeve, 20a Valve seat assembly, 21a Valve seat, 211a Through hole, 212a Top surface, 213a Bottom surface, 214a Circumferential surface, 2141a Edge, 22a S-type connection pipe, 23a E-type connection pipe, 24a C-type connection pipe, 25a S-type short connection pipe, 30a Slider, 1b Valve seat assembly, 1ab Top surface, 11b Valve seat, 11bb First surface, 111b Through hole, 112b First reinforcement, 113b Second reinforcement, 12b Sealing seat, 13b S connecting pipe, 14b E connecting pipe, 15b C connecting pipe, 16b S short connecting pipe, 17b Copper sleeve, 2b Slider, 21b Flange, 3b Valve body assembly, 31b Valve body, 311b Mounting hole, 312b Connection port, 32b D short connecting pipe, 33b D short connecting pipe, 34b E short connecting pipe, 35b C short connecting pipe. [Modes for carrying out the invention]

[0030] Illustrative embodiments will be described in more detail below with reference to the drawings. However, the illustrative embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. In this specification, relative terms such as “top” and “bottom” are used to describe the relative relationship of one illustrated assembly to another, but these terms are used herein for convenience only, as are the illustrative directions shown in the drawings. If the illustrated device is inverted, it will be understood that the “top” assembly described becomes the “bottom” assembly. Other relative terms such as “top” and “bottom” have similar meanings. When one structure is “top” another structure, it may mean that the structure is formed integrally on top of the other structure, that the structure is “directly” mounted on top of the other structure, or that the structure is “indirectly” mounted on top of the other structure via the other structure.

[0031] The terms "one," "one," "this," and "the aforementioned" are used to indicate the existence of one or more elements / components / etc. The terms "includes" and "possess" are used to indicate unrestricted inclusion, meaning that there may be other elements / components / etc. besides those listed. Terms such as "first," "second," etc., are used for notation only and do not limit the number of objects they refer to.

[0032] Referring to Figures 1 to 8, this embodiment provides a directional control valve including a valve body assembly 10a and a valve seat assembly 20a, wherein the valve body assembly 10a includes a valve body 11a and an inlet connecting pipe, the valve body 11a has a valve chamber and a mounting hole 111a communicating with the valve chamber, the inlet connecting pipe is fixedly connected to the valve body 11a and communicates with the valve chamber, the valve seat assembly 20a includes a valve seat 21a and an inlet / outlet connecting pipe, the valve seat 21a is provided with a through hole 211a, the inlet / outlet connecting pipe is fixedly attached to the valve seat 21a and communicates with the through hole 211a, the valve seat 21a is inserted into the mounting hole 111a and the circumferential surface 214a of the valve seat 21a is fixedly connected to the hole wall of the mounting hole 111a.

[0033] The directional control valve provided in this embodiment is assembled by first assembling the valve body assembly 10a and the valve seat assembly 20a separately, then inserting the valve seat 21a into the mounting hole 111a, and fixing the circumferential surface 214a of the valve seat 21a to the wall of the mounting hole 111a. This configuration reduces the number of parts required for a single assembly, simplifying the operation process and reducing the risk of parts falling off. Specifically, the inlet connection pipe is fixed to the valve body 11a, the inlet / outlet connection pipes are fixed to the valve seat 21a and connected to the through hole 211a, and then the valve seat 21a, with the inlet / outlet connection pipes fixed to it, is inserted into the mounting hole 111a, and the circumferential surface 214a of the valve seat 21a is fixed to the wall of the mounting hole 111a.

[0034] In one embodiment, the valve seat assembly 20a and the valve body assembly 10a are brazed in a furnace. Compared to the conventional method of brazing all components, such as the valve body, valve seat, and connecting pipes, in a single step, the occupied space is reduced, allowing for the selection of a brazing furnace with a smaller opening.

[0035] The technical aspects of this embodiment will be described in detail below, using an example where the directional control valve is a four-way valve.

[0036] Referring to Figure 4, the valve body 11a has a cylindrical structure, the mounting hole 111a has a projected shape in a preset plane that is rectangular, rounded rectangular, or oval, the preset plane is perpendicular to the depth direction of the mounting hole 111a, the valve seat 21a has a contour shape of at least one cross-section that matches the projected shape of the mounting hole 111a, the cross-section of the valve seat 21a is perpendicular to the depth direction of the through hole 211a and parallel to the preset plane.

[0037] In this embodiment, referring to Figure 6, the valve seat 21a is a rectangular plate or block-shaped structure of equal thickness, and the circumferential surface 214a of the valve seat 21a is perpendicular to the lower surface 213a of the valve seat 21a (as shown in Figure 3). Therefore, the contour shape of each cross-section of the valve seat 21a conforms to the projected shape of the mounting hole 111a.

[0038] It should be understood that the cross-sectional contour shapes at different positions of the valve seat 21a do not necessarily have to be identical. When aligning the valve seat 21a with the mounting hole 111a and inserting it into a predetermined position within the mounting hole 111a, it is sufficient that the cross-sectional contour shape at the position corresponding to the mounting hole 111a matches the projected shape of the mounting hole 111a. This facilitates welding and sealing of the valve seat 21a and the valve body 11a.

[0039] Furthermore, the shape of the valve seat 21a can be determined based on the shape of the mounting hole 111a, and the shape of the mounting hole 111a can be determined based on the shape of the valve seat 21a.

[0040] In one embodiment, as shown in Figure 2, the inlet / outlet connecting pipes include an S connecting pipe 22a, an E connecting pipe 23a, and a C connecting pipe 24a, where the S connecting pipe 22a is located between the E connecting pipe 23a and the C connecting pipe 24a, and the S connecting pipe 22a corresponds to the inlet connecting pipe. As shown in Figure 3, the directional control valve further includes a slider 30a, which is movable within the valve chamber, thereby connecting the inlet connecting pipe to the E connecting pipe 23a, or the inlet connecting pipe to the C connecting pipe 24a.

[0041] As shown in Figures 5 and 6, the valve seat 21a is provided with three through holes 211a, which are spaced apart along the longitudinal direction of the valve seat 21a. One end of the S connecting pipe 22a is welded to the intermediate through hole 211a, and the E connecting pipe 23a and C connecting pipe 24a are welded to the through holes 211a located at both ends. In the four-way valve, the inlet connecting pipe is the D connecting pipe 12a, which is attached to the connection port 112a located on the opposite side of the mounting hole 111a of the valve body 11a, and the D connecting pipe 12a corresponds to the position of the S connecting pipe 22a.

[0042] The slider 30a can move within the valve chamber, thereby enabling switching between different flow paths. For example, when the slider is moved to one end of the E connecting pipe 23a of the valve body 11a shown in Figure 2, the D connecting pipe 12a communicates with the C connecting pipe 24a, and the E connecting pipe 23a communicates with the S connecting pipe 22a. When the slider 30a is moved to the other end of the valve body shown in Figure 2, the D connecting pipe 12a communicates with the E connecting pipe 23a, and the C connecting pipe 24a communicates with the S connecting pipe 22a.

[0043] Since slider 30a is based on conventional technology, its structure will not be explained in detail.

[0044] In one embodiment, the four-way valve further includes a pilot valve (not shown), and the valve body assembly 10a and the valve seat assembly 20a each include a short connecting pipe for connecting to the capillary of the pilot valve.

[0045] As illustrated in Figure 2, the short connecting pipes include a D short connecting pipe 13a, an S short connecting pipe 25a, an E short connecting pipe 14a, and a C short connecting pipe 15a. The D short connecting pipe 13a is welded to and connected to the D connecting pipe 12a, the S short connecting pipe 25a is welded to and connected to the S connecting pipe 22a, the E short connecting pipe 14a is welded to and connected to one end of the valve body 11a adjacent to the E connecting pipe 23a, and the C short connecting pipe 15a is welded to and connected to one end of the valve body 11a adjacent to the C connecting pipe 24a.

[0046] In one embodiment, referring to Figure 5, the valve body assembly 10a further includes a copper sleeve 16a connected to one end of the D connecting pipe 12a, and referring to Figure 7, the valve seat assembly 20a further includes copper sleeves 16a connected to the S connecting pipe 22a, the E connecting pipe 23a, and the C connecting pipe 24a, respectively.

[0047] In one embodiment, referring to Figure 6, the valve seat 21a has an upper surface 212a and a lower surface 213a, the upper surface 212a and the lower surface 213a are located on both sides of the circumferential surface 214a of the valve seat 21a, the lower surface 213a faces the inside of the valve body 11a, and the upper surface 212a is parallel to the lower surface 213a.

[0048] Exemplary, the valve seat 21a is plate-shaped or block-shaped and has an upper surface 212a, a lower surface 213a, and a circumferential surface 214a surrounding the upper surface 212a and the lower surface 213a. The upper surface 212a is parallel to the lower surface 213a, which ensures that the thickness of the edge and the middle part of the valve seat 21a are substantially equal, and further improves the deformation resistance of the valve seat 21a. At the same time, the upper surface 212a is flat, making it easy to process and eliminating the need to process it into an arc shape as in the prior art.

[0049] In this embodiment, "the upper surface 212a is parallel to the lower surface 213a" means that the upper surface 212a is approximately parallel to the lower surface 213a within the allowable error range.

[0050] It should be understood that the shape of the projection of the lower surface 213a of the circumferential surface 214a in this embodiment within the plane in which it is located may be a rectangle, a rounded rectangle, or an oval, and is not limited to these.

[0051] Referring to Figure 3, during the movement of the slider 30a, a seal is formed between the open end face of the slider 30a and the lower surface 213a of the valve seat 21a, and the lower surface 213a of the valve seat 21a is a smooth plane in order to enhance the sealing effect.

[0052] For example, after the welding of the valve seat assembly 20a is completed, the lower surface 213a can be ground to form a smooth flat surface.

[0053] In the conventional technology, since the D-shaped valve seat 2' is located inside the valve chamber, the space in the valve chamber occupied by the D-shaped valve seat 2' for the valve body 1' is relatively large. For example, referring to Figure 1, the height of the conventional D-shaped valve seat 2' is h, and the height of the edge of the D-shaped valve seat 2' is h0. That is, the shortest distance between the surface of the D-shaped valve seat 2' in close contact with the slider 3' and the chamber wall of the valve chamber is h0, and h0 is usually in the range of 1 mm to 6 mm. The height of the slider 3' is H1.

[0054] In one embodiment, at least a portion of the edge of the valve seat 21a, where the circumferential surface 214a and the lower surface 213a are connected, is welded to the wall of the mounting hole 111a.

[0055] In some embodiments, the edge connecting the circumferential surface 214a and the lower surface 213a of the valve seat 21a is welded to the wall of the mounting hole 111a using a laser welding method. Referring to Figure 2, the edge 2141a connecting the circumferential surface 214a and the long side of the lower surface 213a of the valve seat 21a overlaps with the wall of the mounting hole 111a that extends along the axial direction of the valve body 11a. That is, the distance between the lower surface 213a of the valve seat 21a and the wall of the mounting hole 111a that extends along the axial direction of the valve body 11a is 0. In other words, the valve seat 21a does not occupy space in the valve chamber, and if the inner diameter of the valve body 11a remains constant and the inner diameter of the D connecting pipe 12a remains constant (i.e., the flow area of ​​the high-pressure side fluid remains constant), the height of the slider 30a can be increased, increasing the flow area of ​​the low-pressure side fluid and improving the flow capacity of the four-way valve.

[0056] Furthermore, the shorter side (the side adjacent to the longer side) of the lower surface of the valve seat 21a is offset from the hole wall of the mounting hole 111a that extends along the circumferential direction of the valve body 11a, and the circumferential surface where the shorter side of the lower surface of the valve seat 21a is located is welded to the hole wall of the mounting hole 111a that extends along the circumferential direction of the valve body 11a.

[0057] For example, compared to slider 3' in Figure 1, the height H2 of slider 30a in this embodiment can be increased by h0 relative to H1.

[0058] It should be understood that when the height of the slider 30a remains constant and the inner diameter of the D-connection pipe 12a remains constant, the diameter of the valve body 11a can be appropriately reduced, thereby reducing costs.

[0059] Furthermore, a portion of the circumferential surface 214a of the valve seat 21a can also be positioned within the valve chamber.

[0060] Furthermore, the directional control valve may be a multi-way valve other than a four-way valve.

[0061] This embodiment is, Steps include manufacturing the valve assembly 10a, Steps include manufacturing a valve seat assembly 20a, A method for manufacturing a directional control valve, comprising the step of fixing and attaching a valve seat assembly 20a to a valve body assembly 10a, The steps for manufacturing the valve assembly 10a are: The valve body 11a and inlet connecting pipe are provided, the valve body 11a having a valve chamber, the valve body 11a having a mounting hole 111a machined into it, the mounting hole 111a communicating with the valve chamber, The inlet connecting pipe is fixed and connected to the valve body 11a, and the inlet connecting pipe communicates with the valve chamber, The step of manufacturing the valve seat assembly 20a is: A valve seat 21a and an inlet / outlet connecting pipe are provided, and the valve seat 21a has a through hole 211a machined into it. The inlet / outlet connecting pipe is fixed and connected to the valve seat 21a, and the inlet / outlet connecting pipe communicates with the through hole 211a, The step of fixing and attaching the valve seat assembly 20a to the valve body assembly 10a is: The present invention further provides a method for manufacturing a directional control valve, which includes inserting the valve seat 21a in the valve seat assembly 20a into the mounting hole 111a and fixing the circumferential surface 214a of the valve seat 21a to the wall of the mounting hole 111a.

[0062] The method for manufacturing a directional control valve provided in this embodiment involves first assembling the valve body assembly 10a and the valve seat assembly 20a separately, then inserting the valve seat 21a into the mounting hole 111a, and fixing the circumferential surface 214a of the valve seat 21a to the wall of the mounting hole 111a. This reduces the number of parts in a single assembly, simplifying the operation process and reducing the risk of parts falling off. Specifically, the inlet connection pipe is fixed and connected to the valve body 21, the inlet and outlet connection pipes are fixed and attached to the valve seat 21a and communicate with the through hole 211a, the valve seat 21a with the inlet and outlet connection pipes fixed and attached is inserted into the mounting hole 111a, and the circumferential surface 214a of the valve seat 21a is fixed and connected to the wall of the mounting hole 111a.

[0063] Exemplary, the method for manufacturing a directional control valve provided in this embodiment is used to manufacture the directional control valve provided in this embodiment.

[0064] The method for manufacturing the directional control valve provided in this embodiment will be described in detail below, using an example where the directional control valve is a four-way valve.

[0065] Referring to Figure 8, the method for manufacturing the directional control valve provided in this embodiment includes the following steps.

[0066] Step S102: Manufacture the valve body assembly 10a. In step S102, the step of manufacturing the valve assembly 10a includes the following: A valve body 11a and an inlet connecting pipe are provided, the valve body 11a having a valve chamber, and the valve body 11a has a mounting hole 111a which communicates with the valve chamber. Referring to Figure 4 as an example, the valve body 11a has a cylindrical structure, and the shape of the mounting hole 111a may be rectangular, rounded rectangular, or oval. The valve body 11a has a connection port 112a which, as an example, faces the mounting hole 111a and communicates with the valve chamber. The inlet connecting pipe is fixed and connected to the valve body 11a, and the inlet connecting pipe communicates with the valve chamber. Specifically, the inlet connecting pipe is the D connecting pipe 12a, and the D connecting pipe 12a is fixed and attached to the connection port 112a.

[0067] Step S104: Manufacture the valve seat assembly 20a. In step S104, the step of manufacturing the valve seat assembly 20a includes the following: A valve seat 21a and inlet / outlet connecting pipes are provided, with through holes 211a machined into the valve seat 21a. Referring to Figure 6 as an example, three through holes 211a are machined into the valve seat 21a, and the three through holes 211a are spaced apart along the longitudinal direction of the valve seat 21a, and the inlet / outlet connecting pipes include an S connecting pipe 22a, an E connecting pipe 23a, and a C connecting pipe 24a. The inlet / outlet connecting pipe is fixed and connected to the valve seat 21a, and the inlet / outlet connecting pipe communicates with the through hole 211a. Specifically, the S connecting pipe 22a is located between the E connecting pipe 23a and the C connecting pipe 24a, the S connecting pipe 22a corresponds to the inlet connecting pipe, one end of the S connecting pipe 22a is welded to the intermediate through hole 211a, the position of the S connecting pipe 22a corresponds to the position of the D connecting pipe 12a, and the E connecting pipe 23a and the C connecting pipe 24a are welded to the through holes 211a located at both ends.

[0068] Step S106: Securely attach the valve seat assembly 20a to the valve body assembly 10a. Step S106, the step of fixing and attaching the valve seat assembly 20a to the valve body assembly 10a, includes the following: The valve seat 21a of the valve seat assembly 20a is inserted into the mounting hole 111a, and the circumferential surface 214a of the valve seat 21a is fixed to the wall of the mounting hole 111a for connection. Exemplarily, the valve seat 21a of the valve seat assembly 20a obtained in step S104 is inserted into the mounting hole 111a, and the circumferential surface 214a of the valve seat 21a is fixed to the wall of the mounting hole 111a for connection.

[0069] In actual manufacturing steps, the order of steps S102 and S104 can be reversed, or they can be performed simultaneously.

[0070] In one embodiment, in the step of fixing and connecting the inlet connecting pipe to the valve body 11a, the inlet connecting pipe is brazed to the valve body 11a using furnace brazing.

[0071] Specifically, the D connecting pipe 12a is brazed to the connection port 112a of the valve body 11a using furnace brazing.

[0072] In one embodiment, the four-way valve further includes a pilot valve, and the valve body assembly 10a and the valve seat assembly 20a each include a short connecting pipe for connecting to the capillary of the pilot valve.

[0073] Therefore, in step S102, the step of manufacturing the valve body assembly 10a is, The invention further includes providing short connecting pipes, and exemplary, the short connecting pipes in the valve body assembly 10a include D short connecting pipe 13a, E short connecting pipe 14a, and C short connecting pipe 15a.

[0074] In the step of fixing and connecting the inlet connection pipe to the valve body 11a, the short connection pipe and the inlet connection pipe are brazed to the valve body 11a using furnace brazing.

[0075] Specifically, by attaching the D connecting pipe 12a to the connection port 112a of the valve body 11a, attaching the D short connecting pipe 13a to the corresponding position of the D connecting pipe 12a, attaching the E short connecting pipe 14a to the end of the valve body 11a adjacent to the E connecting pipe 23a, and attaching the C short connecting pipe 15a to the end of the valve body 11a adjacent to the C connecting pipe 24a, and then placing them together in a brazing furnace and brazing them, manufacturing efficiency can be improved.

[0076] Furthermore, a copper sleeve 16a is connected to the end of the D-connection pipe 12a of the four-way valve. By attaching the copper sleeve 16a to one end of the D-connection pipe 12a and then placing them together in a brazing furnace for brazing, manufacturing efficiency can be further improved.

[0077] In one embodiment, in the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat 21a, the inlet / outlet connecting pipe is brazed to the valve seat 21a using furnace brazing.

[0078] Specifically, using furnace brazing, the S connecting pipe 22a, E connecting pipe 23a, and C connecting pipe 24a are brazed into their respective through holes 211a.

[0079] In one embodiment, the step of manufacturing the valve seat assembly 20a is: The invention further includes providing short connecting pipes, and exemplary, the short connecting pipe in the valve seat assembly 20a includes a short connecting pipe 25a.

[0080] In the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat 21a to form the valve seat assembly 20a, the short connecting pipe and the inlet / outlet connecting pipe are brazed to the valve seat 21a using furnace brazing.

[0081] Specifically, by separately attaching the S connecting pipe 22a, E connecting pipe 23a, and C connecting pipe 24a to their respective through holes 211a, attaching the S short connecting pipe 25a to the corresponding position on the S connecting pipe 22a, and then brazing them together in a brazing furnace, manufacturing efficiency can be improved.

[0082] Furthermore, copper sleeves 16a are connected to the ends of the S-connection pipe 22a, E-connection pipe 23a, and C-connection pipe 24a of the four-way valve. By attaching each copper sleeve 16a to one end of the S-connection pipe 22a, E-connection pipe 23a, and C-connection pipe 24a, and then placing them together in a brazing furnace for brazing, manufacturing efficiency can be further improved.

[0083] Of course, the short connecting pipe and the copper sleeve 16a can also be welded individually.

[0084] In one embodiment, in the step of fixing and connecting the circumferential surface 214a of the valve seat 21a to the wall of the mounting hole 111a, the circumferential surface 214a of the valve seat 21a is welded to the wall of the mounting hole 111a using a laser welding method.

[0085] Specifically, the brazed valve seat assembly 20a and valve body assembly 10a are removed from the brazing furnace, the valve seat 21a of the valve seat assembly 20a is then inserted into the mounting hole 111a, and the circumferential surface 214a of the valve seat is welded to the wall of the mounting hole 111a using a laser welding method.

[0086] In actual manufacturing, after removing the brazed valve seat assembly 20a and valve body assembly 10a from the brazing furnace, the valve seat assembly 20a and valve body assembly 10a can be inspected. If there are problems with the welding quality, the brazing flow in each connecting pipe is generally at the joint between the connecting pipe and the valve seat 21a, and in serious cases, it may appear on the lower surface 213a of the valve seat 21a. There is sufficient space for correction work, and rework is easy. Furthermore, if deformation occurs on the surface of the valve seat 21a, it can be detected by measuring with a tool such as a cutting edge gauge, and can be repaired by reworking by grinding off the welding material on the surface using a grinder, electric polishing tool, or file.

[0087] This embodiment provides a valve seat assembly 1b. Referring to Figure 9, the valve seat assembly 1b provided in this embodiment includes a valve seat 11b and a sealing seat 12b, the valve seat 11b being for connection to the valve body 31b, the sealing seat 12b being made of plastic and integrated with the valve seat 11b by injection molding, and the sealing seat 12b being used to form a seal between itself and the open end face of the slider 2b (see Figure 18).

[0088] The valve seat assembly provided in this embodiment integrates the sealing seat 12b with the valve seat 11b by injection molding. The injection molding step is simple and easy to perform, and because the sealing seat 12b is made of plastic, it is easy to obtain a high degree of surface flatness, thereby satisfying the sealing requirements. When in use, the valve seat assembly 1b provided in this embodiment is attached to the valve body 31b of the directional control valve, and a seal is formed between the sealing seat 12b and the open end face of the slider 2b inside the valve body 31b. This allows the slider 2b to slide smoothly on the surface of the sealing seat 12b, reducing rattling and noise, and minimizing wear.

[0089] In one embodiment, the valve seat assembly 1b further includes an inlet / outlet connecting pipe, and referring to Figure 3, the valve seat 11b is provided with a through hole 111b, the inlet / outlet connecting pipe is fixedly attached to the valve seat 11b and communicates with the through hole 111b.

[0090] The inlet and outlet connecting pipes include different numbers of connecting pipes, and the configuration of the inlet and outlet connecting pipes also differs when the valve seat assembly 1b is applied to different types of directional control valves. In this embodiment, the technical aspects of this embodiment will be described in detail with respect to an example where the directional control valve is a four-way valve, that is, an example where the valve seat assembly is applied to a four-way valve.

[0091] Referring to Figure 10, the inlet / outlet connecting pipes include S connecting pipe 13b, E connecting pipe 14b, and C connecting pipe 15b, with S connecting pipe 13b located between E connecting pipe 14b and C connecting pipe 15b, and S connecting pipe 13b corresponding to the inlet connecting pipe of the four-way valve.

[0092] The valve seat 11b is provided with three through holes 111b, which are spaced apart along the longitudinal direction of the valve seat 11b. One end of the S connecting pipe 13b is welded to the intermediate through hole 111b, and the E connecting pipe 14b and the C connecting pipe 15b are welded to the through holes 111b located at both ends.

[0093] In one embodiment, the valve seat assembly 1b includes an S-short connecting pipe 16b for connection to the capillary of the pilot valve of the four-way valve. Exemplarily, the S-short connecting pipe 16b is welded to and in communication with the S-connecting pipe 13b.

[0094] In one embodiment, referring to Figure 10, the valve seat assembly 1b further includes copper sleeves 17b connected to the S connecting pipe 13b, the E connecting pipe 14b, and the C connecting pipe 15b, respectively.

[0095] In one embodiment of the present disclosure, the outer surfaces of the valve seat 11b and the sealing seat 12b include an upper surface 1ab, a lower surface, and an outer peripheral surface surrounding the space between the upper surface 1ab and the lower surface, wherein the upper surface 1ab is a smooth plane that is the surface of the sealing seat 12b away from the valve seat 11b, the lower surface is a surface of the valve seat 11b away from the sealing seat 12b, and the through hole 111b penetrates the upper surface 1ab and the lower surface.

[0096] Exemplary, the integrated valve seat 11b and sealing seat 12b are plate-like or block-like as a whole, and the outer surface of this integrated structure includes an upper surface 1ab, a lower surface, and an outer peripheral surface surrounding the upper surface 1ab and the lower surface, the upper surface 1ab being the surface of the sealing seat 12b away from the valve seat 11b and being a smooth plane, and after the valve seat assembly 1b is attached to the valve body, the upper surface 1ab faces inward to the valve body 31b and forms a seal between the upper surface 1ab and the open end surface of the slider 2b, the lower surface being the surface of the valve seat 11b away from the sealing seat 12b, and the outer peripheral surface including the circumferential surface of the valve seat 11b and the circumferential surface of the sealing seat 12b.

[0097] In order to ensure communication between the S connecting pipe 13b, E connecting pipe 14b, and C connecting pipe 15b and the valve chamber, the through hole 111b penetrates both the upper surface 1ab and the lower surface. That is, when the sealing seat 12b is injection molded, the through hole 111b is not blocked by the injection molded material.

[0098] Referring to Figure 11 as an example, the valve seat 11b already has a through hole 111b formed in it before the sealing seat is injection molded, which prevents damage to the structure of the sealing seat when the through hole is machined after injection molding.

[0099] Referring to Figure 18, during the movement of the slider 2b, a seal is formed between the open end face of the slider 2b and the sealing seat 12b, and the upper surface 1ab is a smooth plane to enhance the sealing effect.

[0100] In one embodiment, the upper surface 1ab is parallel to the lower surface, and this configuration allows the edge and central portions of the valve seat 11b to be substantially equal in thickness, thereby improving the valve seat 11b's resistance to deformation. At the same time, the lower surface is flat, making it easy to machine and eliminating the need to machine it into an arc shape to fit the inner wall of the valve chamber.

[0101] In this embodiment, "the upper surface 1ab is parallel to the lower surface" means that the upper surface 1ab is approximately parallel to the lower surface within the tolerance range.

[0102] For example, the integrated valve seat 11b and sealing seat 12b are, as a whole, rectangular plate-like or block-like structure of equal thickness, and their outer surfaces are perpendicular to the lower surface.

[0103] It should be understood that the outer circumferential surface in this embodiment may include, but is not limited to, a rectangle, a rounded rectangle, or an oval shape as its projected shape within the plane in which the lower surface is located.

[0104] In one embodiment, the valve seat 11b is provided with a reinforcing portion, and the surface of the reinforcing portion is in contact with the sealing seat 12b.

[0105] By providing a reinforcing portion, the injection connection strength between the sealing seat 12b and the valve seat 11b can be strengthened, preventing separation of the sealing seat 12b and the valve seat 11b. Exemplarily, the reinforcing portion includes at least one of a blind via hole, a through groove, an annular groove, and a projection.

[0106] In one embodiment of the present disclosure, referring to Figures 12 to 17, the valve seat 11b has a first surface 11bb and a second surface provided opposite to each other, and a circumferential surface provided surrounding the first surface 11bb and the second surface, and the reinforcing portion includes a first reinforcing portion 112b provided on the first surface 11bb of the valve seat 11b, and / or the reinforcing portion includes a second reinforcing portion 113b provided on the circumferential surface of the valve seat 11b.

[0107] Specifically, the first surface 11bb is the surface of the valve seat 11b that is close to the sealing seat 12b, and after injection molding, the first surface 11bb is covered by the sealing seat 12b. The second surface is the surface of the valve seat 11b that is away from the sealing seat 12b, i.e., the second surface is the bottom surface.

[0108] In one possible design, the reinforcing portion includes a first reinforcing portion 112b provided on the first surface 11bb of the valve seat 11b. The number of first reinforcing portions 112b may be one or more.

[0109] Referring to Figure 12 as an example, the first reinforcing portion 112b may be a blind via hole. It should be understood that the blind via hole may be provided in a portion other than the edge of the first surface 11bb, and for example the contour shape of the blind via hole may be circular, rectangular, or elliptical, and the blind via hole may be provided at the edge of the first surface 11bb to form a notch, for example the blind via hole may be a semicircular notch.

[0110] For example, the first reinforcing portion 112b may be a through groove. Referring to Figure 13, for instance, one through groove is provided between two adjacent through holes 111b, the longitudinal direction of the through groove is perpendicular to the line connecting the centers of the two adjacent through holes 111b, and both ends of the longitudinal direction of the through groove penetrate the circumferential surface of the valve seat 11b. Referring to Figure 6 for example, the through groove is a T-groove, but of course, the through groove may also be a straight groove or a dovetail groove.

[0111] For example, the first reinforcing portion 112b may be an annular groove or projection.

[0112] The first reinforcing portion 112b may include at least one of a blind via hole, a through groove, an annular groove, and a projection.

[0113] In another possible design, the reinforcement includes a first reinforcement 112b provided on the first surface 11bb of the valve seat 11b and a second reinforcement 113b provided on the circumferential surface of the valve seat 11b.

[0114] For illustrative purposes, referring to Figures 15 to 17, the first reinforcing portion 112b is a first annular groove provided on the edge of the first surface 11bb, and the second reinforcing portion 113b is a second annular groove provided on the circumferential surface, with the first annular groove communicating with the second annular groove.

[0115] In a third possible design, the reinforcing portion may consist only of the second reinforcing portion 113b provided on the circumferential surface of the valve seat 11b.

[0116] Referring to Figures 19 and 20, this embodiment further provides a directional control valve comprising a valve body assembly 3b, a slider 2b, and a valve seat assembly 1b provided in this embodiment, wherein the valve body assembly 3b comprises a valve body 31b, the valve body 31b having a valve chamber, the slider 2b being slidably mounted within the valve chamber, and the valve seat 11b being fixedly connected to the valve body 31b, forming a seal between the sealing seat 12b and the open end face of the slider 2b.

[0117] The directional control valve provided in this embodiment uses the valve seat assembly 1b provided in this embodiment, and since the material of the sealing seat 12b is plastic, it is easy to obtain a high degree of surface flatness, thereby satisfying the sealing requirements. During use, the slider 2b can slide smoothly and smoothly on the surface of the sealing seat 12b, making it less likely to generate rattle or abnormal noise, reducing wear, and improving the service life of the directional control valve.

[0118] The technical aspects of this embodiment will be described in detail below, using an example where the directional control valve is a four-way valve.

[0119] In one embodiment, the valve body assembly 1b further includes an inlet connecting pipe, the valve body 31b has a mounting hole 311b that communicates with the valve chamber, the inlet connecting pipe is fixedly connected to the valve body 31b and communicates with the valve chamber, the valve seat 11b is inserted into the mounting hole 311b, and the circumferential surface of the valve seat 11b is fixedly connected to the hole wall of the mounting hole 311b.

[0120] For example, the inlet connecting pipe is fixed and connected to the valve body 31b, the inlet and outlet connecting pipe is fixed and attached to the valve seat 11b and communicates with the through hole 111b, the sealing seat 12b is injection molded onto the valve seat 11b to which the inlet and outlet connecting pipe is fixed and attached, the valve seat 11b is inserted into the mounting hole 311b and the circumferential surface of the valve seat 11b is fixed and connected to the hole wall of the mounting hole 311b.

[0121] In the four-way valve, the inlet connecting pipe is the D connecting pipe 32b, which is attached to the connection port 312b (see Figure 21) on the side away from the mounting hole 311b of the valve body 31b, and the D connecting pipe 32b corresponds to the position of the S connecting pipe 13b.

[0122] The slider 2b can move within the valve chamber, thereby enabling switching between different flow paths. For example, when the slider 2b is moved to one end of the valve body 31b shown in Figure 12, the D connecting pipe 32b communicates with the C connecting pipe 15b, and the E connecting pipe 14b communicates with the S connecting pipe 13b. When the slider 2b is moved to the position shown in Figure 20, the D connecting pipe 32b communicates with the E connecting pipe 14b, and the C connecting pipe 15b communicates with the S connecting pipe 13b.

[0123] In one embodiment, the four-way valve further includes a pilot valve (not shown), referring to Figure 21, the valve body assembly 1b includes a D short connecting pipe 33b, an E short connecting pipe 34b, and a C short connecting pipe 35b for connection to the capillary of the pilot valve, wherein the D short connecting pipe 33b is welded to and communicates with the D connecting pipe 32b, the E short connecting pipe 34b is welded to and communicates with one end of the valve body 31b adjacent to the E connecting pipe 14b, and the C short connecting pipe 35b is welded to and communicates with one end of the valve body 31b adjacent to the C connecting pipe 15b.

[0124] In one embodiment, referring to Figure 21, the valve assembly 1b further includes a copper sleeve 17b connected to one end of the D connecting pipe 32b.

[0125] In one embodiment, the circumferential surface of the valve seat 11b is welded to the wall of the mounting hole 311b.

[0126] In some embodiments, the circumferential surface of the valve seat 11b is welded to the wall of the mounting hole 311b using a laser welding method.

[0127] In one embodiment, referring to Figure 22, the valve body 31b has a cylindrical structure, and the mounting hole 311b has a projected shape on a reference plane that is rectangular, rounded rectangular, or oval, and the reference plane is a plane perpendicular to the depth direction of the mounting hole 311b. The valve seat 11b has a contour shape of at least one cross-section that matches the projected shape of the mounting hole 311b, and the cross-section of the valve seat 11b is parallel to the surface of the sealing seat 12b on the side away from the valve seat 11b.

[0128] In this embodiment, referring to Figures 9 and 11, the valve seat 11b is a rectangular plate or block-shaped structure of equal thickness, the circumferential surface of the valve seat 11b is perpendicular to the first surface of the valve seat 11b, and the cross-section of the valve seat 11b is parallel to the upper surface 1ab. Therefore, the contour shape of each cross-section of the valve seat 11b all conforms to the projected shape of the mounting hole 311b.

[0129] For example, the cross-section of the valve seat 11b is perpendicular to the depth direction of the through hole 111b.

[0130] It should be understood that the cross-sectional contour shapes at different positions of the valve seat 11b do not necessarily have to be identical. When the valve seat 11b is aligned with the mounting hole 311b and inserted into a predetermined position in the mounting hole 311b, it is sufficient that the cross-sectional contour shape at the position corresponding to the mounting hole 311b matches the projected shape of the mounting hole 311b. This facilitates welding and sealing of the valve seat 11b and the valve body 31b.

[0131] Furthermore, the shape of the valve seat 11b can be determined based on the shape of the mounting hole 311b, and the shape of the mounting hole 311b can also be determined based on the shape of the valve seat 11b.

[0132] In one embodiment, referring to Figure 23, the slider 2b is a housing having an opening, and a flange 21b is provided on the edge of the opening, and the flange 21b contacts the sealing seat 12b to form a sliding seal.

[0133] In one embodiment, the material of the slider 2b is metal or an alloy. Since the material of the sealing seat 12b is plastic, the material of the slider 2b may be metal or an alloy, and compared to a slider made of plastic, the slider 2b made of metal or an alloy in this embodiment has higher structural strength and is less prone to breakage.

[0134] For example, the material of slider 2b can be stainless steel, aluminum, copper, or brass.

[0135] Furthermore, the material of slider 2b is not limited to metal or alloy; any material that meets the strength requirements is acceptable.

[0136] This embodiment is, The steps include providing the valve seat 11b, The present invention further provides a method for manufacturing a valve seat assembly, which includes the step of injection molding a sealing seat 12b onto a valve seat 11b.

[0137] The manufacturing method for the valve seat assembly provided in this embodiment involves injecting a sealing seat 12b onto the valve seat 11b, thereby integrally forming the sealing seat 12b and the valve seat 11b. The process is simple and easy to implement, and because the material of the sealing seat 12b is plastic, it is easy to obtain a high degree of surface flatness, thereby satisfying the sealing requirements. When in use, the valve seat assembly manufactured by the manufacturing method for the valve seat assembly provided in this embodiment is attached to the valve body 31b of the directional control valve, and when the sealing seat 12b forms a seal with the open end face of the slider 2b inside the valve body 31b, the slider 2b can slide smoothly on the surface of the sealing seat 12b, reducing rattling and noise, and minimizing wear.

[0138] Exemplary, the method for manufacturing a valve seat assembly provided in this embodiment is used to manufacture the valve seat assembly provided in this embodiment.

[0139] The method for manufacturing the valve seat assembly provided in this embodiment will be described in detail below, using an example where the valve seat assembly is that of a four-way valve.

[0140] Referring to Figure 24, the method for manufacturing the valve seat assembly provided in this embodiment includes the following steps: Step S102: Provide the valve seat 11b. Step S104: The sealing seat 12b is injection molded onto the valve seat 11b. In step S104, the sealing seat 12b is injected into the valve seat 11b using an injection molding apparatus. The injection molding apparatus is conventional, and an appropriate injection molding chamber can be selected according to the requirements of the actual manufacturing process.

[0141] Figure 9 shows the structure of the valve seat assembly fabricated based on step S104 in Figure 24.

[0142] In one embodiment, in step S102, a through hole 111b is formed in the valve seat 11b. For example, the through hole 111b is machined into a plate-shaped or block-shaped valve seat 11b, and this machining step is in accordance with the prior art.

[0143] Referring to Figure 11 as an example, three through holes 111b are machined into the valve seat 11b, and the three through holes 111b are spaced apart along the longitudinal direction of the valve seat 11b.

[0144] Before performing step S104, the following steps are also included. Step S1032: Provide a valve seat assembly. Exemplarily, the inlet and outlet connecting pipes in the valve seat assembly include an S connecting pipe 13b, an E connecting pipe 14b, and a C connecting pipe 15b. Step S1034: The inlet / outlet connecting pipe is fixed and connected to the valve seat 11b, and the inlet / outlet connecting pipe communicates with the through hole 111b. Specifically, the S connecting pipe 13b is located between the E connecting pipe 14b and the C connecting pipe 15b, one end of the S connecting pipe 13b is welded to the intermediate through hole 111b, and the E connecting pipe 14b and the C connecting pipe 15b are welded to the through holes 111b located at both ends, respectively.

[0145] In one embodiment, in the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat 11b, the inlet / outlet connecting pipe is brazed to the valve seat 11b using furnace brazing.

[0146] Specifically, in step S1034, the S connecting pipe 13b, E connecting pipe 14b, and C connecting pipe 15b are brazed into their respective through holes 111b using furnace brazing.

[0147] In one embodiment, the following steps are further included before performing step S104. Step S1036: Provide a short connecting pipe. Exemplarily, the short connecting pipe in the valve seat assembly includes a short connecting pipe 16b. Step S1038: Using furnace brazing, the short connecting pipe and the inlet / outlet connecting pipe are brazed to the valve seat 11b.

[0148] Specifically, by attaching the S connecting pipe 13b, E connecting pipe 14b, and C connecting pipe 15b to their respective through holes 111b, attaching the S short connecting pipe 16b to the corresponding position on the S connecting pipe 13b, and then brazing them together in a brazing furnace, manufacturing efficiency can be improved.

[0149] Furthermore, copper sleeves 17b are connected to the ends of the S-connection pipe 13b, E-connection pipe 14b, and C-connection pipe 15b of the four-way valve. By attaching each copper sleeve 17b to one end of the S-connection pipe 13b, E-connection pipe 14b, and C-connection pipe 15b, and then brazing them together in a brazing furnace, manufacturing efficiency can be further improved.

[0150] Of course, the short connecting pipe and the copper sleeve 17b can also be welded individually.

[0151] Figure 26 is a schematic diagram of the valve seat assembly manufactured according to step S1038 in Figure 25, before the sealing seat 12b has been injection molded. Referring to Figure 26, the sealing seat 12b has not yet been injection molded onto the valve seat 11b; that is, when step S104 in Figure 25 is performed, injection molding is carried out based on the structure shown in Figure 26. Referring to Figure 27, the structure shown in Figure 26 is placed in an injection molding apparatus, and the sealing seat 12b is injection molded onto the valve seat 11b. After injection molding, the resulting valve seat assembly is shown in Figure 10.

[0152] After brazing the valve seat 11b, S connecting pipe 13b, E connecting pipe 14b, C connecting pipe 15b, and S short connecting pipe 16b with the copper sleeve 17b, the sealing seat 12b is further injection molded onto the valve seat 11b to prevent the sealing seat 12b from melting in the high-temperature brazing furnace.

[0153] In one embodiment, in step S102, a reinforcing portion is formed on the valve seat 11b. Exemplarily, the reinforcing portion includes a first reinforcing portion 112b machined onto the first surface 11bb of the valve seat 11b and / or a second reinforcing portion 113b machined onto the circumferential surface of the valve seat 11b, and exemplarily, the reinforcing portion includes at least one of a blind via hole, a through groove, an annular groove and a projection.

[0154] The structure and arrangement of the reinforcement parts will not be described in detail here, so please refer to Figures 12 to 17 again.

[0155] The processing order of the through-hole 111b and the reinforcing portion on the valve seat 11b can be selected according to the requirements of the actual manufacturing process.

[0156] This embodiment is, The steps include providing a valve body assembly 3b including a valve body 31b having a valve chamber, a valve seat assembly 1b manufactured by the method for manufacturing a valve seat assembly provided in this embodiment, and a slider 2b. The steps include: mounting the slider 2b slidably within the valve chamber of the valve body assembly 1b; The present invention further provides a method for manufacturing a directional control valve, which includes the step of fixing and attaching the valve seat assembly 1b to the valve body 31b to form a seal between the sealing seat 12b and the open end face of the slider 2b.

[0157] In the method for manufacturing a directional control valve provided in this embodiment, the valve seat assembly provided is manufactured by the method for manufacturing a valve seat assembly provided in this embodiment. As a result, the sealing seat 12b is injection molded integrally with the valve seat 11b, the steps are simple and easy to implement, and furthermore, since the material of the sealing seat 12b is plastic, it is easy to obtain a high degree of surface flatness, thereby satisfying the sealing requirements. During use, the slider 2b can slide smoothly and easily on the surface of the sealing seat 12b, making it less likely to generate rattle or abnormal noise, reducing wear, and improving the service life of the directional control valve.

[0158] Exemplary, the method for manufacturing a directional control valve provided in this embodiment is used to manufacture the directional control valve provided in this embodiment.

[0159] The method for manufacturing the directional control valve provided in this embodiment will be described in detail below, using an example where the directional control valve is a four-way valve.

[0160] Referring to Figure 28, the method for manufacturing a directional control valve provided in this embodiment includes the following steps:

[0161] Step S202: Provide a valve body assembly 3b, a valve seat assembly 1b, and a slider 2b. The provided valve body assembly 3b includes a valve body 31b, the valve body 31b having a valve chamber, and the provided valve seat assembly 1b is manufactured by a method for manufacturing a valve seat assembly according to this embodiment. Exemplary, the valve body 31b has a cylindrical structure with seal covers (not shown) at both ends, and the internal cavity of the cylindrical structure is a valve chamber. Exemplary, the valve seat assembly provided is manufactured using the manufacturing method for valve seat assemblies shown in Figure 25.

[0162] Step S204: Slider 2b is slidably mounted inside the valve chamber of the valve body assembly. Exemplary, the slider 2b is inserted into the valve chamber from one end of the valve body 31b. Since the sealing seat 12b is made of plastic, for example, nylon or polyphenylene sulfide (PPS), the slider 2b provided in this embodiment can be made of metal or an alloy. A slider 2b made of metal or an alloy has high structural strength and is less likely to break during use.

[0163] Step S206: The valve seat assembly is fixed and mounted to the valve body 31b, and a seal is formed between the sealing seat 12b and the open end face of the slider 2b. Referring to Figure 23 as an example, a flange 21b is provided on the edge of the opening of the slider 2b, and the flange 21b contacts the sealing seat 12b to form a sliding seal.

[0164] In one embodiment, in the step of providing a valve body assembly, referring to Figure 22, a mounting hole 311b is formed on the valve body 31b, the mounting hole 311b communicates with the valve chamber, and the provided valve body assembly further includes an inlet connecting pipe, the inlet connecting pipe is fixedly connected to the valve body 31b, and the inlet connecting pipe communicates with the valve chamber.

[0165] Specifically, the mounting hole 311b may have a rectangular, rounded rectangular, or oval projection shape in a plane perpendicular to the depth direction of the mounting hole 311b. Referring to Figure 22, the valve body 31b has a connection port 312b machined into it. Exemplarily, the connection port 312b faces the mounting hole 311b and communicates with the valve chamber. The inlet connection pipe is a D connection pipe 32b, which is fixed and attached to the connection port 312b.

[0166] In one embodiment, in the step of fixing and connecting the inlet connecting pipe to the valve body 31b, the inlet connecting pipe is brazed to the valve body 31b using furnace brazing.

[0167] Specifically, the D connecting pipe 32b is brazed to the connection port 312b of the valve body 31b using furnace brazing.

[0168] In one embodiment, in the step of providing the valve body assembly 3b, the provided valve body assembly 3b further includes a short connecting pipe, and the short connecting pipe and the inlet connecting pipe are brazed to the valve body 31b using furnace brazing.

[0169] Specifically, the four-way valve further includes a pilot valve (not shown), and referring to Figure 21, the short connecting pipes in the valve body assembly 3b include D short connecting pipe 33b, E short connecting pipe 34b, and C short connecting pipe 35b.

[0170] Specifically, by attaching the D connecting pipe 32b to the connection port 312b of the valve body 31b, attaching the D short connecting pipe 33b to the corresponding position of the D connecting pipe 32b, attaching the E short connecting pipe 34b to the end of the valve body 31b closest to the E connecting pipe 14b, attaching the C short connecting pipe 35b to the end of the valve body 31b closest to the C connecting pipe 15b, and then placing these together in a brazing furnace and brazing them, manufacturing efficiency can be improved.

[0171] Furthermore, referring to Figure 21, a copper sleeve 17b is connected to the end of the D-connection pipe 32b of the four-way valve. By attaching the copper sleeve 17b to one end of the D-connection pipe 32b and then placing them together in a brazing furnace for brazing, manufacturing efficiency can be further improved.

[0172] In one embodiment, the step of fixing and attaching the valve seat assembly 1b to the valve body 31b includes inserting the valve seat 11b of the valve seat assembly 1b into the mounting hole 311b and fixing and connecting the circumferential surface of the valve seat 11b to the hole wall of the mounting hole 311b.

[0173] As an example, the valve seat 11b in the valve seat assembly 1b manufactured by the manufacturing method of the valve seat assembly 1b shown in Figure 25 is inserted into the mounting hole 311b, and the circumferential surface of the valve seat 11b is fixed to the wall of the mounting hole 311b and connected.

[0174] In this embodiment, since the valve seat assembly 1b and the valve body assembly 3b are brazed in a furnace, a brazing furnace with a small opening can be selected.

[0175] In one embodiment, in the step of fixing and connecting the circumferential surface of the valve seat 11b to the wall of the mounting hole 311b, the circumferential surface of the valve seat 11b is welded to the wall of the mounting hole 311b using a laser welding method.

[0176] Specifically, the brazed valve seat assembly 1b and valve body assembly 3b are removed from the brazing furnace, the valve seat 11b of the valve seat assembly 1b is inserted into the mounting hole 311b, and the circumferential surface of the valve seat 11b is welded to the wall of the mounting hole 311b using a laser welding method.

[0177] In actual manufacturing, after removing the brazed valve seat assembly 1b and valve body assembly 3b from the brazing furnace, the valve seat assembly 1b and valve body assembly 3b can be inspected. If there are problems with the welding quality, the brazing position on each connecting pipe is generally at the joint between the connecting pipe and the valve seat 11b, providing ample space for correction work and making rework easy. Furthermore, if deformation occurs on the surface of the valve seat 11b, it can be detected by measuring with a tool such as a cutting edge gauge, and can be repaired by reworking by grinding off the welding material on the surface using a grinder, electric polishing tool, or file.

[0178] It should be understood that the present invention is not limited to the detailed structure and arrangement of the components shown herein. The present invention may have other embodiments and can be realized and performed in various forms. The aforementioned variations and modifications fall within the scope of the invention. It should be understood that this disclosure, as disclosed and limited herein, covers all substitutable combinations of two or more individual features referred to or evident herein and / or in the drawings. These different combinations constitute several substitutable aspects of the invention. The embodiments described herein illustrate the best known modes for realizing the invention and make it possible to utilize the invention.

Claims

1. A valve assembly comprising a valve body and an inlet connecting pipe, wherein the valve body has a valve chamber and a mounting hole communicating with the valve chamber, and the inlet connecting pipe is fixedly connected to the valve body and communicates with the valve chamber. A directional control valve comprising a valve seat assembly including a valve seat and an inlet / outlet connecting pipe, wherein the valve seat is provided with a through hole, the inlet / outlet connecting pipe is fixedly attached to the valve seat and communicates with the through hole, 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.

2. The directional control valve according to claim 1, wherein the valve seat has an upper surface and a lower surface, the upper surface and the lower surface are located on both sides of the circumferential surface of the valve seat, the lower surface faces the inside of the valve body, and the upper surface is parallel to the lower surface.

3. The directional control valve according to claim 2, wherein at least a portion of the edge to which the circumferential surface of the valve seat and the lower surface are connected is welded to the wall of the mounting hole.

4. The directional control valve according to any one of claims 1 to 3, wherein the mounting hole has a projected shape in a plane perpendicular to the depth direction of the mounting hole that is rectangular, rounded rectangular, or oval, and the valve seat has a contour shape of at least one cross-section that matches the projected shape of the mounting hole, and the cross-section of the valve seat is perpendicular to the depth direction of the through hole.

5. A directional control valve according to claim 1, comprising a sealing seat and a slider, wherein the sealing seat is made of plastic, the sealing seat is integrated with the valve seat by injection molding, the slider is slidably mounted within the valve chamber, and the sealing seat is used to form a seal between itself and the open end face of the slider.

6. The directional control valve according to claim 5, wherein the outer surfaces of the valve seat and the sealing seat include an upper surface, a lower surface, and an outer peripheral surface surrounding the upper surface and the lower surface, the upper surface being a flat surface of the sealing seat away from the valve seat, the lower surface being a surface of the valve seat away from the sealing seat, and the through hole penetrating the upper surface and the lower surface.

7. The directional control valve according to claim 6, wherein the upper surface is parallel to the lower surface.

8. The directional control valve according to claim 5, wherein the valve seat is provided with a reinforcing portion, and the surface of the reinforcing portion is in contact with the sealing seat.

9. The valve seat has a first surface and a second surface provided opposite to each other, and a circumferential surface provided surrounding the space between the first surface and the second surface, and the reinforcing portion includes a first reinforcing portion provided on the first surface of the valve seat. and / or the reinforcing portion includes a second reinforcing portion provided on the circumferential surface of the valve seat, according to claim 8.

10. The directional control valve according to claim 8, wherein the reinforcing portion includes at least one of a blind via hole, a through groove, an annular groove, and a projection.

11. The directional control valve according to claim 5, wherein the material of the slider is metal or an alloy.

12. Steps for manufacturing a valve assembly, Steps for manufacturing a valve seat assembly, A method for manufacturing a directional control valve, comprising the step of fixing and attaching the valve seat assembly to the valve body assembly, The step of manufacturing the valve assembly is: A valve body and an inlet connecting pipe are provided, the valve body having a valve chamber, the valve body having a mounting hole, and the mounting hole communicating with the valve chamber. The inlet connecting pipe is fixed and connected to the valve body, and the inlet connecting pipe communicates with the valve chamber, The step of manufacturing the valve seat assembly is: A valve seat and an inlet / outlet connecting pipe are provided, and the valve seat has a through hole machined into it. The inlet / outlet connecting pipe is fixed and connected to the valve seat, and the inlet / outlet connecting pipe is in communication with the through hole, The step of fixing and attaching the valve seat assembly to the valve body assembly is: A method for manufacturing a directional control valve, comprising inserting the valve seat in the valve seat assembly into the mounting hole and fixing the circumferential surface of the valve seat to the wall of the mounting hole.

13. A method for manufacturing a directional control valve according to claim 12, wherein in the step of fixing and connecting the inlet connecting pipe to the valve body to form a valve body assembly, the inlet connecting pipe is brazed to the valve body using furnace brazing.

14. A method for manufacturing a directional control valve according to claim 12, wherein in the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat to form a valve seat assembly, the inlet / outlet connecting pipe is brazed to the valve seat using furnace brazing.

15. A method for manufacturing a directional control valve according to claim 12, wherein in the step of fixing and connecting the circumferential surface of the valve seat to the wall of the mounting hole, the circumferential surface of the valve seat is welded to the wall of the mounting hole using a laser welding method.

16. The step of manufacturing the valve assembly is: To provide a short connecting pipe, A method for manufacturing a directional control valve according to claim 13, further comprising brazing the short connecting pipe and the inlet connecting pipe to the valve body using furnace brazing.

17. The step of manufacturing the valve seat assembly is: To provide a short connecting pipe, A method for manufacturing a directional control valve according to claim 14, further comprising brazing the short connecting pipe and the inlet / outlet connecting pipe to the valve seat using furnace brazing.

18. After the step of fixing and connecting the inlet / outlet connecting pipe to the valve seat, A method for manufacturing a directional control valve according to claim 12, further comprising the step of injection molding a sealing seat onto a valve seat.

19. A method for manufacturing a directional control valve according to claim 18, wherein in the step of providing the valve seat, a reinforcing portion is formed on the valve seat, and the reinforcing portion includes at least one of a blind via hole, a through groove, an annular groove, and a projection.

20. The method further includes the steps of providing a slider and slidably mounting the slider within the valve chamber of the valve body assembly, A method for manufacturing a directional control valve according to claim 18 or 19, wherein a seal is formed between the sealing seat and the open end face of the slider.

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