Pressure reducing valve with filtering function

Abstract

The utility model discloses a pressure reducing valve with a filtering function. The pressure reducing valve comprises a valve body, a filtering device in the valve body and a pressure regulating device in the valve body, the valve body is integrally designed, an air inlet and an air outlet are formed in the valve body, and an exhaust port is formed in the lower side of the valve body; the air inlet is connected with a whole vehicle air source, and the air outlet is connected with a transmission shifting air channel. The filtering device comprises a first filter, a second filter, a third filter and a fine filter; a first filter and a fine filter are arranged at the air inlet, a second filter is arranged at the air outlet, and a third filter is arranged at the exhaust port; the pressure regulating device comprises a return spring, a pressure regulating spring, a valve, a valve core, a pressure regulating nut and a piston; after the pressure regulating nut sets pressure, a lock pin is inserted into one end of the pressure regulating nut; the pressure regulating nut, the piston and the valve core are all injection molded parts; the problems that the service life of the pressure reducing valve is shortened due to the fact that dust and water vapor in air enter a valve body, and an existing pressure reducing valve is low in assembling efficiency and unstable in output pressure are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heavy-duty vehicle speed change and relates to a pressure reducing valve with a filtering function. Background Art

[0002] At present, heavy-duty trucks all use a dual intermediate shaft transmission with a main and auxiliary gearbox structure. The auxiliary gearbox relies on the air valve to realize the on-off control of the air circuit, the switching of high and low gears, and the protection of the auxiliary gearbox synchronizer. Since the working pressure of the vehicle input to the transmission is much higher than the normal air pressure required by the transmission shift lever, a special pressure reducing valve is designed at the starting end of the vehicle and transmission air circuit connection to adjust the high air pressure input by the vehicle to the working air pressure of the transmission.

[0003] The existing pressure reducing valve has a relatively simple design structure and single function, which poses design risks. In the existing structure, there is only one filtration, and dust and water vapor in the air can easily enter the valve body through the air inlet and outlet and the exhaust port of the pressure reducing valve, which affects the service life of the pressure reducing valve and causes frequent jamming and air leakage during the use of the pressure reducing valve, causing great inconvenience to the driver. On the other hand, the overall structure adopts a design in which the upper and lower valve bodies are assembled after being processed separately, and the assembly efficiency is low; the pressure regulating nut uses thread locking glue to fix the thread, and the thread locking glue is greatly affected by temperature, gluing process, and vibration, and is easy to fall off, resulting in unstable output pressure. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that dust and water vapor in the air easily enter the valve body through the air inlet and outlet and the exhaust port of the pressure reducing valve in the prior art, which affects the service life of the pressure reducing valve, causes frequent jamming and air leakage during the use of the pressure reducing valve, and brings great inconvenience to the driver, and provides a pressure reducing valve with a filtering function. The pressure reducing valve has a reasonable design, good sealing, long service life, and relatively stable output pressure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pressure reducing valve with filtering function, comprising a valve body 1, a filtering device inside the valve body 1 and a pressure regulating device inside the valve body 1;

[0007] The valve body 1 is provided with an air inlet and an air outlet, and the lower side of the valve body 1 is provided with an exhaust port;

[0008] The filtering device comprises a first filter 14, a second filter 13, a third filter 10 and a fine filter 2; the first filter 14 and the fine filter 2 are arranged at the air inlet, the second filter 13 is arranged at the air outlet, and the third filter 10 is arranged at the exhaust port;

[0009] The pressure regulating device comprises a return spring 3, a pressure regulating spring 15, a valve 4, a valve core 7, a pressure regulating nut 11, and a piston 6; the pressure regulating spring 15 is located inside the valve body 1 near the exhaust port; one end of the pressure regulating spring 15 acts on the valve body 1, and the other end acts on the valve core 7; the return spring 3 is located inside the valve body 1 near the air inlet; one end of the return spring 3 acts on the valve body 1, and the other end acts on the valve 4; in a free state, the pressure regulating spring 15 and the return spring 3 act together, and the valve 4 and the valve core 7 end face seal are in a balanced state;

[0010] The valve body 1 is of one-piece design;

[0011] The pressure regulating device further comprises a locking pin 12; after the pressure regulating nut 11 is set to a pressure, mechanical locking is used, that is, the locking pin 12 is inserted into one end of the pressure regulating nut 11;

[0012] The pressure regulating nut 11, the piston 6 and the valve core 7 are all injection molded parts; the valve 4 is a rubber part.

[0013] The first filter 14 is installed at a position close to the inside of the valve body 1 perpendicular to the air inlet direction; the second filter 13 is installed at a position close to the inside of the valve body 1 perpendicular to the air outlet direction; the third filter 10 is installed to fill the entire exhaust port; the fine filter 2 is arranged in the valve body 1 near the air inlet, and is located on the outer periphery of the upper part of the valve body 1.

[0014] The filtering devices are all filter screen structures, which are sintered with copper powder and have a space cotton layer added inside.

[0015] The air inlet is connected to the vehicle air source, and the air outlet is connected to the transmission shift air path; in the pressure regulating state, the air inlet is connected to the air outlet, the vehicle air source is coarsely filtered by the first filter 14, and then finely filtered by the fine filter 2 before entering the valve body 1, and then filtered by the second filter 13 after pressure regulation by the pressure regulating device before being output.

[0016] The piston 6 is provided with a vent hole which is connected with the gas outlet.

[0017] The valve core 7 is provided with a hollow small hole which is communicated with the exhaust port through a pressure regulating spring 15 .

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses a pressure reducing valve with a filtering function; the pressure reducing valve is designed with a multi-stage filtering function, that is, a filter is respectively arranged at the exhaust port and the air outlet, and two filters are arranged at the air inlet; this design makes it difficult for dust and water vapor in the air to enter the interior of the valve body, thereby reducing the adhesion of various impurities to the internal parts of the valve body, improving the service life of the valve body, and increasing the product's maximum service life by 3 times, from 500,000 times to 2 million times; this multi-stage filtering function also effectively reduces the sticking and air leakage phenomena that often occur during the use of the pressure reducing valve, reduces the failure rate of the pressure reducing valve, and reduces the claim for the transmission gas circuit system by 10% after the whole box is used, about 1 million yuan / year.

[0020] Furthermore, the utility model adopts an integrated design of the valve body, which has higher precision and higher assembly efficiency than the existing products in which the upper and lower valve bodies are assembled separately.

[0021] Furthermore, the utility model uses mechanical locking, that is, inserting a lock pin into one end of the pressure regulating nut. This design is less affected by temperature and vibration, making it difficult for the pressure regulating nut to loosen or even fall off, thereby improving the stability of the output pressure;

[0022] Furthermore, the internal parts of the utility model, such as the pressure regulating nut, the piston and the valve core, are made of injection molded parts instead of metal, so that the overall weight of the product is reduced by 20% and the cost is reduced by 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the structure of a pressure reducing valve with filtering function according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the pressure regulating state of the pressure reducing valve with filtering function according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the pressure regulating completion state of the pressure reducing valve with filtering function according to the embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the exhaust state of the pressure reducing valve with filtering function according to an embodiment of the utility model;

[0028] Among them: 1-valve body; 2-fine filter; 3-return spring; 4-valve; 5-sealing ring 1; 6-piston; 7-valve core; 8-gasket; 9-sealing ring 2; 10-third filter; 11-pressure regulating nut; 12-locking pin; 13-second filter; 14-first filter; 15-pressure regulating spring; 1 hole-air inlet; 2 holes-air outlet; 3 holes-exhaust port. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The utility model is further described in detail below with reference to the accompanying drawings:

[0036] See also Figure 1 The utility model discloses a pressure reducing valve with filtering function, including a valve body 1, a filtering device in the valve body 1 and a pressure regulating device in the valve body. The valve body 1 is provided with an air inlet 1 hole and an air outlet 2 holes, and the lower side of the valve body is provided with an exhaust port 3 holes; the air inlet 1 hole is connected to the air source of the whole vehicle, and the air outlet 2 holes are connected to the gear shifting air path of the transmission; the filtering device comprises a first filter 14, a second filter 13, a third filter 10 and a fine filter 2; the air inlet 1 hole is provided with a first filter 14 and a fine filter 2, the air outlet 2 hole is provided with a second filter 13, and the exhaust port 3 hole is provided with a third filter 10. The air source of the whole vehicle enters the air inlet 1 hole, is coarsely filtered by the first filter 14, and finely filtered by the fine filter 2, and then enters the valve body, is pressure-regulated by the pressure regulating device, filtered by the second filter 13, and then output from the air outlet; the filtering devices are all filter screen structures, which are sintered with copper powder, and a space cotton layer is added inside during processing to achieve water absorption.

[0037] The first filter 14 is installed at a position close to the inside of the valve body 1 perpendicular to the air inlet 1 hole in the air inlet direction; the second filter 13 is installed at a position close to the inside of the valve body 1 perpendicular to the air outlet 2 hole in the air outlet direction; the third filter 10 fills the entire exhaust port 3 holes; the fine filter 2 is arranged in the valve body 1 near the air inlet 1 hole, located on the outer periphery of the upper part of the valve body 1.

[0038] The valve body 1 adopts an integrated design, which has higher precision and higher assembly efficiency than the existing products in which the upper and lower valve bodies are assembled separately.

[0039] The pressure regulating device comprises a return spring 3, a pressure regulating spring 15, a valve 4, a valve core 7, a piston 6, and a pressure regulating nut 11; after the pressure regulating nut 11 is set, a mechanical lock is used, that is, a lock pin 12 is inserted into one end of the pressure regulating nut to be better relaxed; the pressure regulating nut 11 is arranged at the bottom of the valve body 1; the pressure regulating nut 11, the piston 6, and the valve core 7 are all injection molded parts, and the valve 4 is a rubber part; the pressure regulating spring 15 is located at the lower part of the interior of the valve body 1, and the return spring 3 is located at the upper part of the interior of the valve body 1; a hollow valve core 7 is provided on the upper part of the pressure regulating spring 15, and a valve 4 is provided on the lower part of the return spring 3, and the valve 4 is sealed with the end face of the valve core 7 in the free state; the piston 6 is located in the middle part of the valve body 1, and the upper end is sealed with the valve body 1 and is sealed with the end face of the valve 4; a vent hole is provided on the piston 6 to communicate with the air outlet 2 holes.

[0040] The working process of the utility model is as follows:

[0041] In the free state, the pressure regulating spring 15 and the return spring 3 work together, so that the valve core 7 pushes the valve 4 away from the piston 6 and is in a balanced state.

[0042] When the pressure reducing valve is regulating pressure: Figure 2 As shown, at this time, the inlet hole 1 is connected with the outlet hole 2. After the compressed air passes through the inlet hole 1, the first filter 14 coarse filtration, and the fine filter 2, it enters the valve body 1, passes through the gap between the valve 4 and the piston 6, and the vent hole on the piston 6 to the outlet hole 2. The upper end surface of the valve core 7 is subjected to the downward force of the compressed air from the outlet hole 2, which overcomes the upward thrust of the pressure regulating spring 15, pushes the valve core 7 downward, and realizes the reduction of the output pressure.

[0043] When the voltage regulation is completed: Figure 3 As shown, at this time, the inlet 1 hole and the outlet 2 hole are closed. Since the upper end surface of the valve core 7 is subjected to the downward force of the compressed air from the outlet 2 hole during pressure regulation, this force overcomes the upward thrust of the pressure regulating spring 15 and pushes the valve core 7 downward; at the same time, the valve 4 moves downward under the action of the return spring force 3 until it fits with the piston 6. At this time, the valve 4 and the piston 6 form an end face seal, the valve core 7 and the valve 4 fit together to form an end face seal, the inlet 1 hole and the outlet 2 hole are closed, and the pressure regulation work is completed.

[0044] When the pressure at the outlet 2 hole is higher than the set pressure, the pressure reducing valve starts to exhaust: Figure 4 As shown, at this time, the inlet 1 hole and the outlet 2 hole are closed, and the outlet 2 hole is connected with the exhaust port 3 hole. Since the pressure at the outlet 2 hole is higher than the set pressure, the valve core 7 leaves the valve 4 and continues to move downward. At this time, the valve 4 fits with the piston 6 to form an end face seal. After the valve core 7 leaves the valve 4, the exhaust channel opens, and the compressed air at the outlet 2 hole passes through the vent hole on the piston 6 and the hollow small hole of the valve core 7 to the lower side of the valve body 1, and is discharged from the exhaust port 3 hole, completing the exhaust and releasing the excess pressure.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure reducing valve with filtering function, characterized in that: It comprises a valve body (1), a filtering device inside the valve body (1) and a pressure regulating device inside the valve body (1); The valve body (1) is provided with an air inlet and an air outlet, and the lower side of the valve body (1) is provided with an exhaust port; The filtering device comprises a first filter (14), a second filter (13), a third filter (10) and a fine filter (2); the first filter (14) and the fine filter (2) are arranged at the air inlet, the second filter (13) is arranged at the air outlet, and the third filter (10) is arranged at the exhaust port; The pressure regulating device comprises a return spring (3), a pressure regulating spring (15), a valve (4), a valve core (7), a pressure regulating nut (11), and a piston (6); the pressure regulating spring (15) is located inside the valve body (1) near the exhaust port; one end of the pressure regulating spring (15) acts on the valve body (1), and the other end acts on the valve core (7); the return spring (3) is located inside the valve body (1) near the air inlet; one end of the return spring (3) acts on the valve body (1), and the other end acts on the valve (4); in a free state, the pressure regulating spring (15) and the return spring (3) act together, and the valve (4) and the valve core (7) end face seal are in a balanced state.

2. The pressure reducing valve with filtering function according to claim 1, characterized in that: The valve body (1) is of one-piece design.

3. The pressure reducing valve with filtering function according to claim 1, characterized in that: The pressure regulating device also includes a locking pin (12); after the pressure regulating nut (11) is set to a certain pressure, mechanical locking is used, that is, the locking pin (12) is inserted into one end of the pressure regulating nut (11).

4. The pressure reducing valve with filtering function according to claim 1, characterized in that: The pressure regulating nut (11), the piston (6) and the valve core (7) are all injection molded parts.

5. The pressure reducing valve with filtering function according to claim 1, characterized in that: The first filter (14) is installed at a position close to the inside of the valve body (1) perpendicular to the air inlet direction; the second filter (13) is installed at a position close to the inside of the valve body (1) perpendicular to the air outlet direction; the third filter (10) is installed to fill the entire exhaust port; the fine filter (2) is arranged inside the valve body (1) near the air inlet, and is located on the periphery of the upper part of the valve body (1).

6. The pressure reducing valve with filtering function according to claim 1, characterized in that: The filtering devices are all filter screen structures, which are sintered with copper powder and have a space cotton layer added inside.

7. The pressure reducing valve with filtering function according to claim 1, characterized in that: The air inlet is connected to the air source of the whole vehicle, and the air outlet is connected to the gear shift air path of the transmission; in the pressure regulating state, the air inlet is connected to the air outlet, the air source of the whole vehicle is coarsely filtered by the first filter (14), finely filtered by the fine filter (2), and then enters the valve body (1), is pressure-regulated by the pressure regulating device, and is filtered by the second filter (13) before being output.

8. The pressure reducing valve with filtering function according to claim 1, characterized in that: The piston (6) is provided with a vent hole which is in communication with the gas outlet.

9. The pressure reducing valve with filtering function according to claim 1, characterized in that: The valve core (7) is provided with a hollow small hole which is communicated with the exhaust port via a pressure regulating spring (15).

10. The pressure reducing valve with filtering function according to claim 1 or 4, characterized in that: The valve (4) is a rubber part.

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