Slide valve device and air control valve

Abstract

The utility model 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

Technical Field

[0001] The utility model relates to the technical field of railway vehicle air braking, and more particularly to a slide valve device. Background Art

[0002] The air control valve is an important component of the railway vehicle air brake and plays important roles such as charging, releasing, local reduction, braking, and pressure maintaining in the railway vehicle air brake. The main components of a typical air control valve (such as the 120-type air control valve) in the railway vehicle air brake include an intermediate body, a main valve, and an emergency valve. Among them, the main valve mainly includes a main piston, a slide valve device, a throttle valve, and a main valve body, etc. The main piston is installed in the main valve body and includes a pressing plate, a main piston diaphragm, a seal, a main piston rod, etc.

[0003] The slide valve device includes a slide valve seat, a slide valve spring, and a slide valve. The slide valve is pressed against the slide valve seat by the slide valve spring and is integrally installed between the upper and lower shoulders provided on the main piston rod. On one side surface of the slide valve seat, three rows of valve ports are arranged in the left-right direction. Among them, the right row of valve ports from top to bottom are the valve seat charging hole and the valve seat local reduction chamber inlet hole, the middle row of valve ports from top to bottom are the valve seat atmosphere hole and the valve seat braking hole, and the left row of valve ports from top to bottom are the valve seat local reduction valve inlet hole and the valve seat local reduction hole. Corresponding to the three rows of valve ports are provided on the bottom surface of the slide valve (i.e., the plane that fits with the slide valve seat). Among them, the right row of valve ports from top to bottom are the charging hole and the local reduction chamber inlet hole, the middle row of valve ports from top to bottom are the release connection groove and the braking hole, and the left row of valve ports from top to bottom are the local reduction valve inlet hole, the local reduction hole, and the local reduction valve hole. During use, by charging or exhausting the brake pipe at a certain rate and amount, the main piston moves downward or upward due to the pressure difference on both sides, and drives the throttle valve to move relative to the slide valve to connect or cut off the relevant passages on the back of the slide valve, and drives the slide valve to move relative to the slide valve seat to connect or cut off the passages between the bottom surface of the slide valve and the slide valve seat, thereby generating functions such as charging, releasing, local reduction, braking, and pressure maintaining.

[0004] Based on the working principle of the slide valve device, the fitting seal between the slide valve seat and the bottom surface of the slide valve plays a decisive role in the performance of the slide valve device. Once the mating surface wears, it will cause uncontrolled communication between the bottom surface of the slide valve, different valve ports on the slide valve seat, and between the valve ports on the slide valve seat and the slide valve bottom surface and the slide valve chamber (the cavity where the slide valve is located, often called the "slide valve chamber", and the slide valve chamber is always connected to the working air cylinder). Regarding the main reason for the wear of the mating surface, the current consensus in the art is the intrusion of foreign objects. Although, in the prior art, in order to avoid the wear of the mating surface between the slide valve seat and the bottom surface of the slide valve, the method of adding an air filtering device to block the entry of foreign objects is adopted. However, affected by different regional climate conditions, etc., and the intrusion of air compressor grease and the formation of scale after expansion and cooling, the combination of scale and dust in the air, rust in the brake pipe and brake container, etc. will also enter the mating surface between the bottom surface of the slide valve and the slide valve seat, and then wear the mating surface of the two after multiple relative slides between the bottom surface of the slide valve and the slide valve seat. Summary of the Invention

[0005] The purpose of the present invention is to provide a slide valve device, which can solve the technical problems mentioned in the above background art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A slide valve device includes a slide valve seat and a valve sleeve. The slide valve seat includes a first seal and a seat body, and the first seal is sealingly connected to one side of the seat body;

[0008] A chute is provided on the inner hole wall of the valve sleeve, and a second seal is sealingly arranged on the bottom surface of the chute. The side of the first seal away from the seat body can fit with the side surface of the second seal. A first valve port group is provided on the first seal, and a second valve port group corresponding to the first valve port group is provided through the second seal;

[0009] An air path group is provided through the seat body, and the first valve port group is communicated with the air path group;

[0010] Both the first seal and the second seal are made of high-strength wear-resistant materials.

[0011] Further, the first valve port group includes a train administration reduction hole, an air guiding hole, a resistance adjustment groove, a first through hole, a release connection groove, a backflow hole, a first inflation hole, a second inflation hole, a second through hole, and a third through hole;

[0012] The depth of the resistance adjustment groove and the release connection groove is less than the thickness of the first seal, and the train administration reduction hole, the air guiding hole, the first through hole, the backflow hole, the first inflation hole, the second inflation hole, the second through hole, and the third through hole all penetrate the first seal.

[0013] Further, the air passage group includes a groove group formed on the side surface where the seat body is connected to the first seal and a through-hole group formed along the height of the seat body;

[0014] The groove group includes a first groove, a second groove, a third groove, a fourth groove, a fifth groove, and a sixth groove;

[0015] 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;

[0016] The second groove communicates with the second through-hole, the third groove communicates with the first through-hole, the fourth groove communicates with the third through-hole, the fifth groove communicates with the fourth through-hole, and the sixth groove communicates with the fifth through-hole.

[0017] Further, when the first seal is installed in place on the seat body, the train administration reduction hole and the air guiding hole communicate through the first groove, the first through-hole communicates with the third groove, the backflow hole and the third through-hole both communicate with the sixth groove, the first inflation hole and the second inflation hole communicate with the fourth groove, and the second through-hole communicates with the fifth groove.

[0018] Preferably, a third seal is provided on the side of the seat body away from the first seal, and an avoidance hole communicating with the air passage group is provided through the third seal;

[0019] The third seal is also made of a high-strength wear-resistant material.

[0020] Further, the first seal, the second seal, and the third seal are made of ceramics, titanium alloy, or diamond.

[0021] The present utility model also provides an air control valve, and the above-mentioned spool device is installed inside the air control valve.

[0022] Compared with the prior art, the embodiments of the present utility model have at least the following advantages or beneficial effects:

[0023] A spool device provided by the present utility model, by providing a first seal at the bottom of the seat body and a second seal at the bottom of the chute, both the first seal and the second seal are made of high-strength wear-resistant materials. During use, due to the high hardness and excellent wear resistance of the first seal and the second seal, even if foreign matters invade between the first seal and the second seal, it is not easy to cause wear to the first seal and the second seal, thereby ensuring the sealing performance between the first seal and the second seal and increasing the service life of the spool device by more than ten times. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for use in the embodiments. It should be understood that the following attached drawings only show certain embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant attached drawings can also be obtained based on these attached drawings.

[0025] Figure 1 Structural schematic diagram of a slide valve device provided by the present utility model;

[0026] Figure 2 Structural schematic diagram of a slide valve seat provided by the present utility model;

[0027] Figure 3 Structural schematic diagram of a seat body provided by the present utility model;

[0028] Figure 4 Structural schematic diagram of a first seal provided by the present utility model;

[0029] Figure 5 Structural schematic diagram of a valve sleeve provided by the present utility model;

[0030] Figure 6 Internal structural schematic diagram of a slide valve device provided by another embodiment of the present invention.

[0031] Icon: 100 - slide valve seat; 110 - first seal; 111 - reduction hole for train administration; 112 - air guiding hole; 113 - resistance adjustment groove; 114 - first through hole; 115 - release connection groove; 116 - backflow hole; 117 - first inflation hole; 118 - second inflation hole; 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 connection piece; 145 - second connection piece; 200 - valve sleeve; 201 - sliding groove; 210 - second seal. Specific embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the attached drawings here can be arranged and designed in various different configurations.

[0033] Accordingly, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0034] Please refer to Figures 1 to 5 As shown, a slide valve device includes a slide valve seat 100 and a valve sleeve 200, which is applicable to the existing 120-type air control machine. The slide valve seat 100 includes a first seal 110 and a seat body 130. The first seal 110 is sealingly connected to one side of the seat body 130. In this embodiment, a brazing process is used for the connection to ensure the connection strength and sealing performance between the first seal 110 and the seat body 130. A first valve port group is provided on the first seal 110, and an air passage group is disposed through the seat body 130. The first valve port group is in communication with the air passage group.

[0035] A chute 201 is formed on the inner hole wall of the valve sleeve 200, and a conveying pipeline is provided inside the valve sleeve 200. One end of the conveying pipeline extends to the bottom surface of the chute 201. A second seal 210 is sealingly disposed on the bottom surface of the chute 201, and the second seal 210 and the groove surface of the chute 201 are also connected by a brazing process. A second valve port group is disposed through the second seal 210. The second valve port group is in communication with the conveying pipeline and is correspondingly disposed with the first valve port group.

[0036] When the slide valve seat 100 is installed in place on the valve sleeve 200, the bottom of the slide valve seat 100 is located in the chute 201. The chute 201 limits the slide valve seat 100, and the slide valve seat 100 can only move along the length direction of the chute 201. At this time, the first seal 110 is in contact with the second seal 210. By sliding the slide valve seat 100, the first valve port group and the second valve port group can be aligned or misaligned, so as to control the air passage connection through the relative position relationship of the two different valve port groups. It should be noted that only the contact between the first seal 110 and the second seal 210 needs to be ensured, and the contact surface between the two can be a plane or a curved surface.

[0037] Both the first seal 110 and the second seal 210 are made of high-strength wear-resistant materials, such as: ceramics, titanium alloys, diamonds, etc. In this embodiment, the materials of the first seal 110 and the second seal 210 are ceramics. The physical properties of the ceramics meet the manufacturing requirements of the first seal 110 and the second seal 210, and compared with titanium alloys and diamonds, the cost of ceramics is low, which greatly reduces the manufacturing cost of the slide valve device.

[0038] The slide valve belongs to the key component of the main valve of a freight train. Since it needs to be self-sealing and is easy to process during maintenance, the industry generally chooses brass as the main material for manufacturing at present. Although brass has good self-sealing performance and is easy to process, because the external air filtration is not clean and fine particles will enter the friction surface of the slide valve with the air, it will seriously damage the surface of the brass. During the relative movement between the dust and the friction surface of the slide valve, a scratched surface will be formed on the brass surface, ultimately leading to safety accidents such as slide valve damage and slide valve leakage, resulting in brake failure. In this patent, two friction surfaces use ceramics as the working surfaces for slide valve sealing and wear. The reason is that the strength of ceramics is second only to that of diamond. Even if dust enters the friction surface, it cannot damage the friction surface. Instead, it will be ground into finer dust by the ceramics and finally carried out of the slide valve by air.

[0039] In addition, since the freight train is placed outdoors for a long time, the temperature difference across the country is large, with the low temperature reaching as low as -50°C. At the same time, due to the need for cargo thawing, the working temperature can be as high as 180°C. The thermal expansion coefficient of brass is 19.8×10⁻⁶ / °C. At this time, due to the high expansion coefficient, the sealing surface will deform and cause leakage. Therefore, when selecting the manufacturing materials for the first seal 110 and the second seal 210, attention should also be paid to the coefficient of thermal expansion and contraction of the materials. It is preferable to select materials with a small coefficient of thermal expansion and contraction. The smaller the coefficient of thermal expansion and contraction of the first seal 110 and the second seal 210, the wider their applicable range. Even in extremely cold regions such as the western and northern parts of our country, they can be used at any time. The ceramic used in this patent has a thermal expansion coefficient of about 6.5×10⁻⁶ / °C, which is one-third of that of brass. Therefore, it can well improve the leakage caused by temperature changes.

[0040] In this embodiment, the first valve port group includes the train administration reduction orifice 111, the air guiding orifice 112, the resistance adjustment groove 113, the first through hole 114, the release connection groove 115, the backflow orifice 116, the first inflation orifice 117, the second inflation orifice 118, the second through hole 119, and the third through hole 121. The depth of the resistance adjustment groove 113 and the release connection groove 115 is less than the thickness of the first seal 110. The train administration reduction orifice 111, the air guiding orifice 112, the first through hole 114, the backflow orifice 116, the first inflation orifice 117, the second inflation orifice 118, the second through hole 119, and the third through hole 121 all penetrate the first seal 110. The positions of the above first valve port group are the same as those of the first valve port group provided on the existing 120-type slide valve device, and the structures are the same; the structure of the seat body 130 is the same as that of the existing slide valve seat. Therefore, as long as the overall height of the seat body 130 and the first seal 110 is equal to the height of the existing slide valve seat, the slide valve seat 100 provided in this embodiment can be applicable to the existing air control valve.

[0041] In another embodiment, the opening position of the air circuit group is also optimized. The air circuit group includes a groove group formed on the side surface where the seat body 130 is connected to the first seal 110 and a through-hole group formed along the height of the seat body 130.

[0042] Among them, the groove group 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.

[0043] 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.

[0044] When the first seal 110 is installed in place on the seat body 130, the first seal 110 and the seat body 130 jointly block 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, so that the above-mentioned multiple grooves form pipelines. At this time, the train administration reduction hole 111 and the air guiding hole 112 are communicated through the first groove 131. The first through-hole 114 is communicated with the third groove 133 and is communicated with the first through-hole 137 through the third groove 133. The backflow hole 116 and the third through-hole 121 are both communicated with the sixth groove 136 and are communicated with the fifth through-hole 141 through the sixth groove 136. The first inflation hole 117 and the second inflation hole 118 are both communicated with the fourth groove 134 and are communicated with the third through-hole 139 through the fourth groove 134. The second through-hole 119 is communicated with the fifth groove 135 and is communicated with the fourth through-hole 140 through the fifth groove 135.

[0045] In this embodiment, by setting the opening position of the air circuit group at the bottom of the seat body 130 and changing the inner hole processing to slotting on a plane, existing mature plane slotting technology can be applied for processing and detection, reducing the precision requirements and manufacturing difficulty for the opening of the air circuit group, making the manufacturing process of the slide valve device more convenient, and reducing the manufacturing cost. Although the opening position of the air circuit group is changed in this embodiment, the connection position between the first valve port group and the air circuit group and the working principle of the slide valve device are the same as those of the existing slide valve device. Therefore, the functions realized by the connection between the first valve port group and the air circuit group will not be described in detail here.

[0046] In addition, since the side of the seat body 130 away from the first seal 110 needs to be in close contact and sealed with the throttle valve during operation, in order to prevent the seal between the throttle valve and the seat body 130 from failing due to foreign objects entering between the throttle valve and the seat body 130 when the seat body 130 slides. Therefore, a third seal 142 is provided on the side of the seat body 130 away from the first seal 110, and an avoidance hole communicating with the gas path group is provided through the third seal 142. Specifically, an installation groove is formed on the side of the seat body 130 away from the first seal 110, the third seal 142 is placed in the installation groove, and is connected to the seat body 130 by brazing. The material of the third seal 142 is the same as that of the first seal 110. By fitting and sealing the third seal 142 with the throttle valve, the seal failure caused by the wear of the seat body 130 is avoided. Of course, the throttle valve can also be made of high-strength wear-resistant material.

[0047] In another embodiment, please refer to Figure 6 , a slide valve device provided by the present 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 seal 142. The first connecting member 143 is located between the third seal 142 and the seat body 130. The first connecting member 143, the third seal 142 and the seat body 130 are all hermetically connected by a brazing process. The second connecting member 145 is located between the first seal 110 and the base 130. The second connecting member 145, the first seal 110 and the base 130 are also hermetically connected by a brazing process. A first valve port group is also provided on the second connecting member 145 and corresponds to the first valve port group provided on the first seal 110.

[0048] Since the expansion coefficients of the first seal 110 and the third seal 142 are small, therefore, the material of the seat body 130 should also be selected as a metal with a small expansion coefficient, such as kovar alloy. However, kovar alloy is relatively expensive, resulting in a high cost of the slide valve. Therefore, the material of the base 130 of the present 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 with the seat body 130 can be solved.

[0049] In addition, due to the particularity of the slide valve, the diameter of the communication part between the countercurrent hole 116 and the sixth groove 136 needs to be 0.2 mm. When drilling the hole, high-precision requirements often use high-speed drilling. Since the hardness of ceramics is high, diamond tools are generally used. If a hole with a diameter of 0.2 mm is directly machined on the first seal 110, the cost is relatively high. The existing solution is to machine a 1 mm hole in ceramics. At this time, die casting sintering can be used and the cost is almost negligible. A hole with a diameter of 0.2 mm can be drilled on the second connecting member 145 by conventional high-speed drilling, effectively reducing the cost.

[0050] The present utility model also provides an air control valve, and the above-mentioned slide valve device is installed inside the air control valve, thereby prolonging the service life of the air control valve and weakening the influence of temperature factors on the air control valve.

[0051] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A spool valve device, characterized in that, It includes a spool seat and a valve sleeve. The spool seat includes a first seal and a seat body, and the first seal is sealingly connected to one side of the seat body; A chute is provided on the inner hole wall of the valve sleeve, and a second seal is sealingly provided on the bottom surface of the chute. The side of the first seal away from the seat body can be attached to the side surface of the second seal. A first valve port group is provided on the first seal, and a second valve port group corresponding to the first valve port group is provided through the second seal; The first seal and the second seal are slidably connected; An air circuit group is provided through the seat body, and the first valve port group is communicated with the air circuit group; Both the first seal and the second seal are made of high-strength wear-resistant materials.

2. The spool valve device according to claim 1, characterized in that, The first valve port group includes a train administration reduction use hole, an air guiding hole, a resistance adjustment groove, a first through hole, a release connection groove, a backflow hole, a first inflation hole, a second inflation hole, a second through hole and a third through hole; The depth of the resistance adjustment groove and the release connection groove is less than the thickness of the first seal, and the train administration reduction use hole, the air guiding hole, the first through hole, the backflow hole, the first inflation hole, the second inflation hole, the second through hole and the third through hole all penetrate through the first seal.

3. The spool valve device according to claim 2, characterized in that, The air circuit group includes a groove group provided on the side surface of the seat body connected to the first seal and a through hole group provided along the height of the seat body; 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 communicated with the second through hole, the third groove is communicated with the first through hole, the fourth groove is communicated with the third through hole, the fifth groove is communicated with the fourth through hole, and the sixth groove is communicated with the fifth through hole.

4. A spool valve device according to claim 3, characterized in that, When the first seal is installed in place on the seat body, the train administration reduction use hole and the air guiding hole are communicated through the first groove, the first through hole is communicated with the third groove, the backflow hole and the third through hole are both communicated with the sixth groove, the first inflation hole and the second inflation hole are communicated with the fourth groove, and the second through hole is communicated with the fifth groove.

5. A spool valve device according to claim 1, characterized in that, A third seal is provided on the side of the seat body away from the first seal, and an avoidance hole communicated with the air circuit group is provided through the third seal; The third seal is also made of high-strength wear-resistant materials.

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

7. Air control valve, characterized in that, The spool device according to any one of claims 1-6 is installed inside the air control valve.

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