Slide valve device and manufacturing method thereof

Abstract

The invention provides a slide valve device, and relates to the technical field of railway vehicle air braking. Comprising a sliding valve seat and a valve sleeve, the sliding valve seat comprises a first sealing piece and a seat body, and the first sealing piece is in sealing connection with one side of the seat body; a sliding groove is formed in the inner hole wall of the valve sleeve, a second sealing piece is arranged on the bottom face of the sliding groove in a sealed mode, the side, away from the base body, of the first sealing piece can be attached to the side face of the second sealing piece, a first valve port set is arranged on the first sealing piece, and a second valve port set corresponding to the first valve port set is arranged on the second sealing piece in a penetrating mode. A gas path group is arranged in the seat body in a penetrating manner; the first valve port group is communicated with the gas path group; the first sealing piece and the second sealing piece are made of high-strength wear-resistant materials. Due to the fact that the first sealing piece and the second sealing piece are large in hardness and excellent in abrasion resistance, foreign matter is not prone to abrading the first sealing piece and the second sealing piece, the sealing performance between the first sealing piece and the second sealing piece is guaranteed, and the service life of the sliding valve device is prolonged by more than ten times.

Description

[0001] This is a divisional application. The original patent application number is 202411455272.0, the invention title is "A slide valve device and its manufacturing method", and the application date is October 18, 2024. Technical Field

[0002] This invention relates to the field of air braking technology for railway vehicles, and more specifically, to a slide valve device and its manufacturing method. Background Technology

[0003] Air control valves are an important component of railway vehicle air brake systems, playing crucial roles in inflation, release, partial reduction, braking, and pressure maintenance. Typical air control valves in railway vehicle air brake systems (such as the Type 104 and Type 120 air control valves) mainly consist of an intermediate body, a main valve, and an emergency valve. The main valve primarily includes a main piston, a slide valve assembly, a control valve, and a main valve body. The main piston, installed within the main valve body, includes a pressure plate, a main piston diaphragm, seals, and a main piston rod.

[0004] The spool valve assembly includes a spool valve seat, a spool valve spring, and a spool valve. The spool valve is pressed against the spool valve seat by the spool valve spring and is integrally fitted between the upper and lower shoulders on the main piston rod. Three rows of valve ports are arranged along the left-right direction on one side of the spool valve seat. The right row of valve ports, from top to bottom, consists of a valve seat inflation port and a valve seat partial reduction chamber inlet. The middle row of valve ports, from top to bottom, consists of a valve seat vent and a valve seat brake port. The left row of valve ports, from top to bottom, consists of a valve seat partial reduction valve inlet and a valve seat partial reduction port. Correspondingly, three rows of valve ports are arranged on the bottom surface of the spool valve (i.e., the plane that mates with the spool valve seat). The right row of valve ports, from top to bottom, consists of an inflation port and a partial reduction chamber inlet. The middle row of valve ports, from top to bottom, consists of a release connection groove and a brake port. The left row of valve ports, from top to bottom, consists of a partial reduction valve inlet, a partial reduction port, and a partial reduction valve port. In use, by inflating or deflating the brake pipe at a certain rate and amount, the main piston moves downward or upward due to the pressure difference on both sides. This causes the control valve to move relative to the spool valve, connecting or disconnecting the relevant passages between the control valve and the back of the spool valve. It also causes the spool valve to move relative to the spool valve seat, connecting or disconnecting the relevant passages between the bottom surface of the spool valve and the spool valve seat. This produces functions such as inflation, relief, partial reduction, braking, and pressure holding.

[0005] Based on the working principle of the spool valve device, the tight seal between the spool valve seat and the bottom surface of the spool valve plays a decisive role in the performance of the spool valve device. Once wear occurs on the mating surfaces, it will lead to uncontrolled communication between different valve ports on the bottom surface of the spool valve and the spool valve seat, as well as between the valve ports on the spool valve seat and the spool valve chamber. The consensus in the art regarding the most important cause of wear on the mating surfaces is the intrusion of foreign objects. Although existing technologies use air filters to prevent the intrusion of foreign objects and avoid wear on the mating surfaces between the spool valve seat and the bottom surface of the spool valve, the intrusion of grease from the air compressor, which expands and cools to form grease deposits, combined with dust in the air, rust in the brake pipe and brake container, etc., can also enter the mating surfaces between the bottom surface of the spool valve and the spool valve seat, and wear down the mating surfaces after repeated relative sliding between the bottom surface of the spool valve and the spool valve seat.

[0006] In addition, the existing slide valve seat is a one-piece molded design. The traditional one-piece design makes its manufacturing process complicated and requires high precision, resulting in high production costs and time costs. Summary of the Invention

[0007] The purpose of this invention is to provide a spool valve device that can solve the technical problems mentioned in the background section.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A spool valve device includes a spool valve seat and a valve sleeve. The spool valve seat includes a first sealing element and a seat body. The first sealing element is sealed to one side of the seat body. A groove is formed on the inner wall of the valve sleeve. A second sealing element is sealed on the bottom surface of the groove. The side of the first sealing element away from the seat body can fit against the side of the second sealing element. A first valve port group is provided on the first sealing element. A second valve port group corresponding to the first valve port group is passed through the second sealing element. The first sealing element and the second sealing element are slidably connected.

[0010] An air passage assembly is provided on the seat body, and the first valve port assembly is connected to the air passage assembly; the air passage assembly includes a groove assembly opened on the side of the seat body connected to the first seal and a through hole assembly opened along the height of the seat body.

[0011] Furthermore, the first valve port group includes a train control reduction port, an air vent, a resistance adjustment groove, a first through port, a relief connection groove, a counterflow port, a first air inlet, a second air inlet, a second through port, and a third through port;

[0012] The depth of the resistance adjustment groove and the relief connection groove is less than the thickness of the first seal. The train control reduction hole, air duct hole, first through hole, counterflow hole, first inflation hole, second inflation hole, second through hole and third through hole all penetrate the first seal.

[0013] Furthermore, the groove group includes a first groove, a second groove, a third groove, a fourth groove, a fifth groove, and a sixth groove;

[0014] The through-hole group includes a first through-hole, a second through-hole, a third through-hole, a fourth through-hole, and a fifth through-hole;

[0015] The second groove is connected to the second through hole, the third groove is connected to the first through hole, the fourth groove is connected to the third through hole, the fifth groove is connected to the fourth through hole, and the sixth groove is connected to the fifth through hole.

[0016] Furthermore, when the first seal is installed in place on the seat, the train control reduction hole and the air vent hole are connected through the first groove, the first through hole is connected to the third groove, the counterflow hole and the third through hole are both connected to the sixth groove, the first air inlet and the second air inlet are connected to the fourth groove, and the second through hole is connected to the fifth groove.

[0017] Furthermore, a third seal is provided on the side of the seat away from the first seal, and the third seal is provided with a clearance hole that communicates with the air passage assembly.

[0018] Furthermore, the first, second, and third seals are made of ceramic, titanium alloy, or diamond.

[0019] Furthermore, both the first and second seals are made of high-strength wear-resistant materials to adapt to the sealing and sliding connection between the first and second seals; the contact surfaces of the first and second seals are formed by high-strength wear-resistant materials.

[0020] The present invention also provides a method for manufacturing a slide valve device, comprising:

[0021] Cut the metal block to obtain the seat body; groove the side of the seat body that connects to the first seal to obtain the groove assembly;

[0022] Drill holes along the height of the base to obtain a through hole group. The groove group and the through hole group together form the air passage group.

[0023] A first and a second sealing element are obtained by cutting solid high-strength wear-resistant material, and a first valve port group is opened on the first sealing element and a second valve port group is opened on the second sealing element; the surfaces of the first and second sealing elements are polished and metallized.

[0024] The first sealing element is installed on the side of the seat body where the groove assembly is located to obtain the slide valve seat; the second sealing element is installed on the bottom of the slide groove.

[0025] Furthermore, the surface roughness parameter value of the two sides where the first seal and the second seal are in contact is 0.05-0.1um; the surface roughness parameter value of the side where the first seal is connected to the seat and the side where the second seal is connected to the slide groove is 0.3-0.5um.

[0026] Furthermore, the thickness of the surface metallization of the first and second seals is 1-2 μm.

[0027] Furthermore, the width of the first seal is 26-27mm, the length is 80-82mm, and the thickness is 4-5mm.

[0028] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0029] 1. The present invention provides a slide valve device, which comprises a first sealing element at the bottom of the seat and a second sealing element at the bottom of the slide groove, both the first and second sealing elements being made of high-strength wear-resistant materials. During use, due to the high hardness and excellent wear resistance of the first and second sealing elements, even if foreign objects intrude between them, it is not easy to cause wear, thus ensuring the sealing performance between the first and second sealing elements and increasing the service life of the slide valve device by more than ten times.

[0030] 2. The present invention provides a method for manufacturing a slide valve device, which divides the existing one-piece slide valve seat into two parts: a seat body and a first sealing element, which are sealed together by welding. This structure allows for the transformation of internal hole machining into planar slotting when creating the air passage assembly. It enables the application of existing mature planar slotting technology for machining and inspection, reduces the precision requirements and manufacturing difficulty of the air passage assembly, improves the yield of the slide valve seat, and reduces production costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of a slide valve device provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the slide valve seat provided by the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the base provided by the present invention;

[0035] Figure 4 A schematic diagram of the structure of the first sealing element provided by the present invention;

[0036] Figure 5 This is a schematic diagram of the valve sleeve provided by the present invention;

[0037] Figure 6 This is a schematic diagram of the internal structure of a slide valve device according to another embodiment of the present invention.

[0038] Icons: 100-Slide valve seat; 110-First seal; 111-Train control reduction hole; 112-Air priming hole; 113-Resistance adjustment groove; 114-First through hole; 115-Relief connecting groove; 116-Reverse flow hole; 117-First air inlet; 118-Second air inlet; 119-Second through hole; 121-Third through hole; 130-Seat body; 131-First groove; 132-Second groove; 133-Third groove; 134-Fourth groove; 135-Fifth groove; 136-Sixth groove; 137-First through hole; 138-Second through hole; 139-Third through hole; 140-Fourth through hole; 141-Fifth through hole; 142-Third seal; 143-First connector; 145-Second connector; 200-Valve sleeve; 201-Slide groove; 210-Second seal. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] Please refer to Figures 1 to 5As shown, a slide valve device includes a slide valve seat 100 and a valve sleeve 200, which is suitable for existing 120-type air control units. The slide valve seat 100 includes a first sealing element 110 and a seat body 130. The first sealing element 110 is sealed to one side of the seat body 130. In this embodiment, the connection is achieved by brazing, thereby ensuring the connection strength and sealing performance between the first sealing element 110 and the seat body 130. A first valve port assembly is provided on the first sealing element 110, and an air passage assembly passes through the interior of the seat body 130, with the first valve port assembly and the air passage assembly communicating with each other.

[0042] A groove 201 is formed on the inner wall of the valve sleeve 200. A conveying pipe is located inside the valve sleeve 200, with one end extending to the bottom surface of the groove 201. A second sealing element 210 is sealed on the bottom surface of the groove 201, and the second sealing element 210 and the groove surface of the groove 201 are connected by brazing. A second valve port assembly is threaded through the second sealing element 210, communicating with the conveying pipe, and corresponding to the first valve port assembly.

[0043] When the valve seat 100 is installed on the valve sleeve 200, the bottom of the valve seat 100 is located within the slide groove 201. The slide groove 201 limits the movement of the valve seat 100, which can only move along the length of the slide groove 201. At this time, the first seal 110 and the second seal 210 are in contact. By sliding the valve seat 100, the first valve port group and the second valve port group can be aligned or misaligned, thereby controlling the gas circuit connection through the relative positional relationship of the two different valve port groups. It should be noted that it is only necessary to ensure that the first seal 110 and the second seal 210 are in contact; the contact surface can be a plane or a curved surface.

[0044] Both the first sealing element 110 and the second sealing element 210 are made of high-strength, wear-resistant materials, such as ceramics, titanium alloys, and diamond. In this embodiment, the first sealing element 110 and the second sealing element 210 are made of ceramics. The physical properties of ceramics meet the manufacturing requirements of the first sealing element 110 and the second sealing element 210. Moreover, ceramics are cheaper than titanium alloys and diamonds, which greatly reduces the manufacturing cost of the slide valve device. On the other hand, it provides better convenience for the cooperation between the first valve port group and the second valve port group.

[0045] The slide valve is a key component of the main valve system in freight trains. Due to its self-sealing requirement and ease of machining during maintenance, the industry generally chooses brass as the main material for manufacturing. While brass possesses good self-sealing properties and is easy to process, fine particles from the outside air can easily enter the friction surface of the slide valve, severely damaging the brass surface. During the relative movement of dust and the friction surface of the slide valve, scratches can form on the brass surface, ultimately leading to slide valve damage, leakage, and brake failure. This patent uses ceramic as the sealing and wear-resistant working surface of the slide valve. The reason is that ceramic's strength is second only to diamond; even if dust enters the friction surface, it cannot damage it. Instead, the ceramic will grind the dust into finer particles, which will eventually be carried out of the slide valve by the air.

[0046] Furthermore, freight trains are often left outdoors for extended periods, experiencing wide temperature variations across the country, with temperatures dropping as low as -50°C. Additionally, cargo requires thawing, which raises the operating temperature to as high as 180°C. Brass has a thermal expansion coefficient of 19.8*10. -6 At temperatures below a certain temperature (°C), the high coefficient of thermal expansion can cause deformation of the sealing surface, leading to leakage. Therefore, when selecting the materials for the first sealing element 110 and the second sealing element 210, it is necessary to pay attention to the coefficient of thermal expansion and contraction. Materials with a low coefficient of thermal expansion and contraction are preferred. The lower the coefficient of thermal expansion and contraction of the first sealing element 110 and the second sealing element 210, the wider their applicability, allowing them to be used regardless of the time of day, even in extremely cold regions such as western and northern my country. The ceramic used in this patent has a coefficient of thermal expansion of approximately 6.5*10. -6 / ℃, which is one-third that of brass, thus effectively improving leakage caused by temperature changes.

[0047] In this embodiment, the first valve port assembly includes a train control reduction port 111, an air vent 112, a resistance adjustment groove 113, a first through hole 114, a relief connection groove 115, a counterflow hole 116, a first inflation hole 117, a second inflation hole 118, a second through hole 119, and a third through hole 121. The depths of the resistance adjustment groove 113 and the relief connection groove 115 are less than the thickness of the first seal 110. The train control reduction port 111, the air vent 112, the first through hole 114, the counterflow hole 116, the first inflation hole 117, the second inflation hole 118, the second through hole 119, and the third through hole 121 all penetrate the first seal 110. The position of the first valve port group is the same as that of the first valve port group on the existing 120-type slide valve device, and the structure is the same; the structure of the seat 130 is the same as that of the existing slide valve seat. Therefore, as long as the overall height of the seat 130 and the first sealing member 110 is equal to the height of the existing slide valve seat, the slide valve seat 100 provided in this embodiment can be applied to the existing air control valve.

[0048] In another embodiment, the location of the air passage assembly has also been optimized. The air passage assembly includes a group of grooves on the side where the seat 130 connects to the first seal 110 and a group of through holes along the height of the seat 130. The group of grooves includes a first groove 131, a second groove 132, a third groove 133, a fourth groove 134, a fifth groove 135, and a sixth groove 136.

[0049] The through hole group includes a first through hole 137, a second through hole 138, a third through hole 139, a fourth through hole 140, and a fifth through hole 141.

[0050] When the first seal 110 is installed on the seat 130, the first seal 110 and the seat 130 together seal the first groove 131, the second groove 132, the third groove 133, the fourth groove 134, the fifth groove 135, and the sixth groove 136, forming a pipeline. At this time, the train control reduction hole 111 and the air vent hole 112 are connected through the first groove 131. The first through hole 114 is connected to the third groove 133 and, through the third groove 133, to the first through hole 137. The counterflow hole 116 and the third through hole 121 are both connected to the sixth groove 136 and, through the sixth groove 136, to the fifth through hole 141. The first inflation hole 117 and the second inflation hole 118 are both connected to the fourth groove 134 and, through the fourth groove 134, to the third through hole 139. The second through hole 119 is connected to the fifth groove 135 and, through the fifth groove 135, to the fourth through hole 140.

[0051] In this embodiment, by setting the opening position of the air passage assembly at the bottom of the seat 130, the inner hole machining is changed to slotting on the plane. Existing mature plane slotting technology can be used for machining and inspection, which reduces the precision requirements and manufacturing difficulty of the air passage assembly opening, making the manufacturing process of the slide valve device simpler and reducing the manufacturing cost.

[0052] Furthermore, since the side of the seat 130 furthest from the first seal 110 needs to be in close contact with the control valve during operation, a third seal 142 is provided on the side of the seat 130 furthest from the first seal 110 to prevent foreign objects from entering between the control valve and the seat 130 during sliding, thus causing seal failure. Specifically, a mounting groove is formed on the side of the seat 130 furthest from the first seal 110, the third seal 142 is placed in the mounting groove, and it is connected to the seat 130 by brazing. The material of the third seal 142 is the same as that of the first seal 110. By sealing the third seal 142 with the control valve, seal failure caused by wear of the seat 130 is avoided. Of course, the control valve can also be made of a high-strength, wear-resistant material.

[0053] In another embodiment, please refer to Figure 6 The slide valve device provided in this application further includes a first connecting member 143 and a second connecting member 145. Both the first connecting member 143 and the second connecting member 145 are plate-shaped structures and are made of oxygen-free copper. The structure of the first connecting member 143 is the same as that of the third sealing member 142. The first connecting member 143 is located between the third sealing member 142 and the seat 130, and the first connecting member 143, the third sealing member 142, and the seat 130 are all sealed together by brazing. The second connecting member 145 is located between the first sealing member 110 and the seat 130, and the second connecting member 145, the first sealing member 110, and the seat 130 are also sealed together by brazing. The second connecting member 145 also has a first valve port group, which corresponds to the first valve port group on the first sealing member 110.

[0054] Because the first seal 110 and the third seal 142 have small coefficients of thermal expansion, the material of the seat 130 should also be a metal with a small coefficient of thermal expansion, such as Kovar alloy. However, Kovar alloy is relatively expensive, which increases the cost of the slide valve. Therefore, the material of the seat 130 in this application is stainless steel. By adding the first connecting member 143 and the second connecting member 145, the stress problem of brazing the first seal 110 and the third seal 142 to the seat 130 can be solved.

[0055] Furthermore, due to the special nature of the slide valve, the diameter of the connection between the backflow hole 116 and the sixth groove 136 needs to be 0.2mm. When drilling the hole, high precision is required, often using high-speed drilling. However, due to the high hardness of ceramics, diamond tools are generally used. Directly machining a 0.2mm diameter hole on the first sealing element 110 would be costly. The existing solution is to machine a 1mm hole in the ceramic, which can be achieved through die casting, resulting in negligible cost. Alternatively, conventional high-speed drilling can be used to create a 0.2mm diameter hole on the second connecting element 145, effectively reducing costs.

[0056] The present invention also provides a method for manufacturing a slide valve device, comprising:

[0057] S100. Use a laser cutter or milling machine to cut the metal block according to the preset shape to obtain the seat. Then use a milling machine to groove the side of the seat that connects to the first seal to obtain a groove group; then drill holes at specified positions along the height direction of the seat to obtain a through hole group. The groove group and the through hole group together form the air passage group.

[0058] The groove group includes a first groove, a second groove, a third groove, a fourth groove, a fifth groove, and a sixth groove. The depth of each of the above grooves is 2.5-3.5 mm, and the width is 2-3 mm.

[0059] The through-hole group includes a first through-hole, a second through-hole, a third through-hole, a fourth through-hole, and a fifth through-hole. The first through-hole is an oblong hole with a semicircular diameter of 3.5-4 mm and a center distance of 6-7 mm. The second, third, and fourth through-holes are all round holes with a diameter of 1.8-2.2 mm; the fifth through-hole is also a round hole with a diameter of 0.7-0.9 mm.

[0060] S200. A first sealing element and a second sealing element are obtained by laser cutting solid high-strength wear-resistant materials such as ceramics and diamonds, and a first valve port group is opened on the first sealing element and a second valve port group is opened on the second sealing element.

[0061] The width of the first seal is 26-27mm, the length is 80-82mm, and the thickness is 4-5mm. The specifications of the second seal are the same as those of the first seal.

[0062] The first valve assembly includes a train control reduction port, an air vent, a resistance adjustment groove, a first through-hole, a relief connection groove, a counterflow port, a first inflation port, a second inflation port, a second through-hole, and a third through-hole. The train control reduction port, air vent, counterflow port, first inflation port, second through-hole, and third through-hole are each divided into large and small sections, with the depth of the large sections ranging from 2.8 to 3.2 mm. The train control reduction port includes two small sections, one with a diameter of 1-1.2 mm and the other with a diameter of 2-2.5 mm; the air vent has a small section diameter of 1-1.2 mm; the counterflow port has a small section diameter of 0.2-0.25 mm; and the small sections of the first inflation port, second through-hole, and third through-hole all have a small section diameter of 2-2.5 mm.

[0063] The dimensions of the second valve port assembly are the same as those of the second valve port assembly on the existing valve sleeve.

[0064] S300. Polish the surfaces of the first seal and the second seal using a polishing machine. The surface roughness parameter value of the two sides where the first seal and the second seal are in contact is 0.05-0.1um; the surface roughness parameter value of the side where the first seal is connected to the seat and the side where the second seal is connected to the slide groove is 0.3-0.5um.

[0065] After polishing, the surfaces of the first and second seals are metallized. This involves using metallization processes such as molybdenum-manganese plating, gold plating, copper plating, tin plating, nickel plating, and LAP plating to adhere a thin metal film to the surfaces of both seals. The thickness of this metal film is approximately 1-2 μm. This facilitates the connection between the first seal and the seat, and the connection between the second seal and the bottom of the groove.

[0066] S400. Braze the first sealing element to the side of the seat body where the groove assembly is located to obtain the spool valve seat. Braze the second sealing element to the bottom of the spool groove. During welding, ensure that the first valve port assembly is connected to the corresponding groove assembly. The second valve port assembly should correspond one-to-one with the valve ports on the bottom surface of the existing valve sleeve's spool groove.

[0067] In other embodiments, a third sealing element may be provided on the slide seat. The manufacturing and installation method of the third sealing element is as follows:

[0068] S500. A third seal is obtained by laser cutting solid high-strength wear-resistant materials such as ceramics and diamonds, and multiple clearance holes are opened on the third seal. The multiple clearance holes correspond one-to-one with the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole, and the shape and size of the clearance holes are the same as the shape and size of the corresponding through holes.

[0069] The third seal is polished and metallized, and the processing requirements are the same as those for the first seal.

[0070] The third seal is installed on the side of the seat away from the first seal by brazing. During installation, it is important to ensure that the position of the clearance hole corresponds to the position of the through hole group.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A slide valve device, characterized in that, The valve includes a spool valve seat and a valve sleeve. The spool valve seat includes a first sealing element and a seat body. The first sealing element is sealed to one side of the seat body. A groove is provided on the inner wall of the valve sleeve, and a second sealing element is sealed on the bottom surface of the groove. The side of the first sealing element away from the seat can fit against the side of the second sealing element. A first valve port group is provided on the first sealing element, and a second valve port group corresponding to the first valve port group is passed through the second sealing element. The first sealing element and the second sealing element are slidably connected. An air passage assembly is provided on the seat body, and the first valve port assembly is connected to the air passage assembly; the air passage assembly includes a groove assembly formed on the side of the seat body that connects to the first sealing element and a through hole assembly formed along the height of the seat body.

2. The slide valve device according to claim 1, characterized in that, The first valve port group includes a train control reduction port, an air duct port, a resistance adjustment groove, a first through port, a relief connection groove, a counterflow port, a first air inlet port, a second air inlet port, a second through port, and a third through port; The depth of the resistance adjustment groove and the relief connection groove is less than the thickness of the first seal. The train control reduction hole, air duct hole, first through hole, counterflow hole, first inflation hole, second inflation hole, second through hole and third through hole all penetrate the first seal.

3. The slide valve device according to claim 2, characterized in that, The groove group includes a first groove, a second groove, a third groove, a fourth groove, a fifth groove, and a sixth groove; The through hole group includes a first through hole, a second through hole, a third through hole, a fourth through hole, and a fifth through hole; The second groove is connected to the second through hole, the third groove is connected to the first through hole, the fourth groove is connected to the third through hole, the fifth groove is connected to the fourth through hole, and the sixth groove is connected to the fifth through hole.

4. A slide valve device according to claim 3, characterized in that, When the first seal is installed in place on the seat, the train control reduction hole and the air duct hole are connected through the first groove, the first through hole is connected to the third groove, the counterflow hole and the third through hole are both connected to the sixth groove, the first inflation hole and the second inflation hole are connected to the fourth groove, and the second through hole is connected to the fifth groove.

5. A slide valve device according to claim 1, characterized in that, A third sealing element is provided on the side of the seat away from the first sealing element, and the third sealing element is provided with an avoidance hole that communicates with the air passage assembly.

6. A slide valve device according to claim 5, characterized in that, The first seal, the second seal, and the third seal are made of ceramic, titanium alloy, or diamond.

7. A slide valve device according to claim 1 or 2, characterized in that, Both the first and second seals are made of high-strength wear-resistant material to fit and slide together; the contact surfaces of the first and second seals are formed of high-strength wear-resistant material.

8. A method for manufacturing a slide valve device as described in any one of claims 1-7, characterized in that, include: Cut the metal block to obtain the base; Grooving is made on the side where the seat body connects to the first seal to obtain a groove group; holes are drilled along the height direction of the seat body to obtain a through hole group; the groove group and the through hole group together form an air passage group. A first and a second sealing element are obtained by cutting solid high-strength wear-resistant material, and a first valve port group is opened on the first sealing element and a second valve port group is opened on the second sealing element; the surfaces of the first and second sealing elements are polished and metallized. The first sealing element is sealed and installed on one side of the seat body where the groove assembly is located to obtain the slide valve seat; The second seal is installed at the bottom of the chute.

9. The method for manufacturing the slide valve device according to claim 8, characterized in that, The surface roughness parameters of the two sides where the first and second seals are in contact are 0.05-0.1 μm; the surface roughness parameters of the side where the first seal is connected to the seat and the side where the second seal is connected to the slide are 0.3-0.5 μm.

10. The method for manufacturing the slide valve device according to claim 8, characterized in that, The thickness of the surface metallization of the first and second seals is 1-2 μm.

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