Proportional control valve for adjusting air pressure

Abstract

The utility model relates to a proportional control valve for adjusting air pressure. According to the scheme, a valve cavity is divided into a guide cavity for limiting and guiding a valve element, a transmission cavity close to a driving assembly and an adjusting cavity communicated with an air outlet channel. The guide cavity is defined by a sealing ring protrusion on the inner wall of the valve cavity, the position where the sealing ring protrusion is located is connected with the air inlet channel, the valve element is provided with an air guide groove communicated with the air inlet channel, and the driving assembly drives the valve element to move in the valve cavity in the axial direction so as to switch the air blocking position and the air guide position. When the valve element is located at the air blocking position, the valve element sealing gasket is in sealing fit with the sealing ring protrusion, the guiding cavity is not communicated with the adjusting cavity, and when the valve element is located at the air guiding position, the valve element sealing gasket is separated from the sealing ring protrusion so that the guiding cavity and the adjusting cavity can be communicated. In the process that the driving assembly drives the valve element to move axially, the sliding sealing assembly is always in sealing fit with the inner wall of the guide cavity, and inlet air is prevented from leaking to the transmission cavity. Compared with a corrugated pipe, the sliding sealing structure and the valve element sealing gasket are good in durability and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to control valve technical field, concretely relates to a proportion control valve for air pressure regulation. BACKGROUND

[0002] The hydraulic retarder is an auxiliary brake unit for heavy trucks, buses, light and medium trucks, and special vehicles. Its biggest advantage is that it can provide continuous braking torque during long downhill driving, reducing the wear and tear and thermal recession risk of traditional mechanical brake systems.

[0003] The braking torque of the retarder is related to the amount and pressure of the working oil entering, and also changes with the rotational speed of the transmission shaft. The amount and pressure of the oil are adjusted by controlling the flow and pressure of the gas through the proportion control valve.

[0004] The existing proportion control valve on the market has a complex structure and poor control precision and durability. For example, the Chinese utility model patent with publication number CN210014029U, named "Hydraulic Retarder Control Valve", seals the valve core through a corrugated pipe sealing structure. However, the welded part of the corrugated pipe sealing structure is prone to cracking, which can cause poor durability and reliability, making it difficult to ensure sealing precision and leading to poor control effect of the control valve. SUMMARY

[0005] The utility model aims to develop a proportion control valve for air pressure regulation to solve the problem of poor durability and reliability of the proportion control valve sealing structure of the automobile retarder in the prior art.

[0006] The utility model is implemented through the following technical solutions:

[0007] A proportion control valve for air pressure regulation, comprising a drive assembly and a valve body, the valve body having an air inlet channel, an air outlet channel, and a valve cavity for accommodating a valve core, the inner wall of the valve cavity having a sealing ring protrusion at the air inlet channel communication position, the valve cavity including a guide cavity radially limiting the valve core formed by the sealing ring protrusion, and an adjustment cavity and a transmission cavity respectively located on both sides of the guide cavity;

[0008] The middle section of the valve core has a gas guide groove communicating with the air inlet channel, and the two ends of the valve core are respectively an adjustment end extending into the adjustment cavity and a transmission end extending into the transmission cavity;

[0009] The adjustment end is sleeved with a valve core sealing gasket, and a sliding sealing assembly is sleeved on the valve core between the transmission end and the gas guide groove, the sliding sealing assembly includes at least one sealing ring, and the sliding sealing assembly and the inner wall of the sealing ring protrusion are in sliding sealing cooperation;

[0010] The driving assembly is in transmission cooperation with the transmission end of the valve core to drive the valve core to axially displace in the valve cavity, so that the valve core has a gas blocking position in which the valve core sealing gasket is in convex sealing cooperation with the sealing ring to block the guide cavity and the adjusting cavity, and has a gas guiding position in which the valve core sealing gasket is separated from the sealing ring to guide the gas through the gas guiding groove to the guide cavity and the adjusting cavity.

[0011] The beneficial effects of the above technical solution are as follows: the valve cavity is divided into the guide cavity for limiting and guiding the valve core, the transmission cavity for cooperating with the driving assembly, and the adjusting cavity for communicating with the gas outlet passage; the valve core has the gas guiding groove, and the driving assembly drives the valve core to axially displace in the valve cavity to switch between the gas blocking position and the gas guiding position; when the valve core is in the gas blocking position, the valve core sealing gasket is in sealing cooperation with the sealing ring to block the guide cavity from the adjusting cavity; when the valve core is in the gas guiding position, the valve core sealing gasket is separated from the sealing ring to guide the gas through the guide cavity and the adjusting cavity; during the axial displacement of the valve core driven by the driving assembly (towards the adjusting cavity), the sliding sealing assembly is always in sealing cooperation with the inner wall of the guide cavity to avoid the leakage of the inlet gas to the transmission cavity; when the valve core is in the gas guiding position, the adjusting end of the valve core drives the valve core sealing gasket away from the sealing ring, the gas guiding groove guides the inlet gas passage and the adjusting cavity, and the gas can be further delivered to the execution cavity and discharged through the gas outlet passage; the above structure forms dynamic sealing through the sliding sealing assembly, and the valve core sealing gasket forms static sealing, so that the two sealing structures seal the valve cavity in two directions, and the sealing ring and the sealing gasket do not need to be welded, have good durability, high reliability, and are easy to replace; appropriate sealing rings or sealing gaskets can be selected according to the sealing precision requirement, so as to improve the sealing precision.

[0012] In a possible implementation, at least two groups of sliding sealing assemblies are arranged on the valve core in intervals, and the at least two groups of sliding sealing assemblies are distributed between the transmission end of the valve core and the gas guiding groove and are in sliding sealing cooperation with the inner wall of the sealing ring.

[0013] In a possible implementation, the sliding sealing assembly is embedded in the outer periphery of the valve core, and the sliding sealing assembly includes a first sealing ring and a second sealing ring located outside the first sealing ring, and the second sealing ring is in sliding sealing cooperation with the inner wall of the sealing ring.

[0014] Specifically, the first sealing ring and the second sealing ring are independent of each other, the cross section of the first sealing ring is circular, the outer periphery of the second sealing ring is adapted to the inner wall of the sealing ring to form face-to-face contact cooperation, and the second sealing ring has a gap for the immersion of lubricating ester to meet the friction property requirement in the design range while ensuring sealing.

[0015] In a possible implementation, the adjusting cavity is provided with a current value calibration assembly, the current value calibration assembly comprises a valve core adjusting nut connected to the adjusting end of the valve core, a spring adjusting pressure plate connected to the adjusting cavity, a second valve core spring limited between the valve core adjusting nut and the spring adjusting pressure plate, and the relative position of the spring adjusting pressure plate and the adjusting cavity is adjustable to adjust the initial compression amount of the second valve core spring to calibrate the opening (pressure building) current value according to the functional requirements.

[0016] For example, the adjusting cavity has a connecting portion with internal threads, the spring adjusting pressure plate is threadedly connected to the connecting portion of the adjusting cavity, the compression amount of the second valve core spring is adjusted by adjusting the threaded engagement length, and after the initial compression amount of the second valve core spring is limited, the driving assembly needs to reach a certain pushing force to push the valve core, and the driving assembly driven by the power source needs to reach a preset current value (calibration value) to be able to push the valve core to displace, and the effect of reaching the calibration current value is achieved.

[0017] In a possible implementation, the valve core sealing gasket is sleeved on the valve core and located on the side of the valve core adjusting nut close to the guide cavity, the valve core sealing gasket is in contact with the convex side wall of the sealing ring when the air guide groove is located at the air blocking position, and a valve core sealing ring is arranged between the end of the valve core adjusting nut close to the guide cavity and the valve core to ensure the sealing performance when the air guide groove is located at the air blocking position.

[0018] In a possible implementation, the exhaust passage and the guide cavity have a first sealing opening, the pressure relief assembly comprises a piston arranged between the first sealing opening and the guide cavity, the piston has an elastic peripheral wing, and the elastic peripheral wing is opened or blocked to the first sealing opening under the action of the air pressure.

[0019] In a possible implementation, the valve body comprises a front valve body and a rear valve plate arranged separately and connected, the exhaust passage is arranged on the rear valve plate, the connecting surface of the front valve body and the rear valve plate has a first sealing opening, and the exhaust passage is provided with a poppet valve, the poppet valve is raised or lowered under the action of the air pressure to control the conduction or blockage of the adjusting cavity and the exhaust passage, the connecting portion of the front valve body and the rear valve plate is provided with a front valve body sealing ring to ensure the sealing connection of the front valve body and the rear valve plate, the front valve body and the rear valve plate are arranged separately, which is easy to assemble and replace the internal parts of the valve cavity, and the poppet valve further controls the air pressure balance as the pressure relief structure in the exhaust passage.

[0020] In a possible implementation, the driving assembly comprises a motor assembly and a slider driven by the motor assembly, a first valve core spring is arranged between the transmission end of the valve core and the slider, the motor assembly drives the slider to compress the first valve core spring to drive the transmission end of the valve core, and the first valve core spring is installed between the valve core and the slider to ensure the relative position of the two when initially installed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The overall structure appearance schematic view of the proportional control valve provided by the utility model is shown in the figure.

[0022] Figure 2 The proportional control valve shown in the figure is shown in the figure. Figure 1 The cross-sectional view of the proportional control valve shown in the figure is shown in the figure.

[0023] Figure 3 The enlarged view of A in the figure is shown in the figure. Figure 2 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure.

[0024] Figure 4 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure. Figure 1 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure.

[0025] Figure 5 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure. Figure 2 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure.

[0026] Figure 6 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure. Figure 1 The cross-sectional view of the front valve body of the proportional control valve shown in the figure is shown in the figure.

[0027] In the figure, 101, motor end cover; 102, front valve body; 1021, air inlet channel; 1023, front valve body sealing ring; 1024, sealing ring convex; 10241, guide cavity; 1025, adjusting cavity; 1026, transmission cavity; 103, rear valve plate; 1031, poppet valve; 1032, pressure relief port; 1033, execution cavity; 1034, first sealing port; 1035, exhaust channel;

[0028] 1, spring adjusting pressure plate; 2, valve core adjusting nut; 3, valve core sealing gasket; 31, valve core sealing ring; 4, sliding sealing assembly; 41, first sealing ring; 42, second sealing ring; 5, valve core; 501, air guide groove; 51, first valve core spring; 52, second valve core spring; 6, sliding block; 7, motor assembly; 8, end cover sealing ring; 9, piston; 91, elastic peripheral wing. DETAILED DESCRIPTION

[0029] Firstly, those skilled in the art should understand that the following embodiments are only used to explain the technical principles of the embodiments of the application, and are not intended to limit the protection scope of the embodiments of the application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0030] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0031] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] To make the objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 6 As shown, this embodiment provides a proportional control valve for air pressure regulation, including a drive assembly, a valve body, and a valve cavity. A pressure relief assembly is provided between the valve cavity and the exhaust channel 1035. The inner wall of the valve cavity of the front valve body 102 has a sealing ring protrusion 1024 communicating with the air intake channel 1021. The valve cavity includes a guide cavity 10241 formed by the sealing ring protrusion 1024 to radially limit the valve core 5, and an adjustment cavity 1025 and a transmission cavity 1026 located on both sides of the guide cavity 10241, respectively. The pressure relief assembly connects the adjustment cavity 1025 and the exhaust channel 1035 under air pressure. The valve core 5 has an air guide groove 501 in the middle section, and the two ends of the valve core 5 are the adjustment end extending into the adjustment cavity 1025 and the transmission end extending into the transmission cavity 1026, respectively.

[0034] The regulating end is sealed with a valve core sealing gasket 3, and a sliding sealing assembly is fitted on the valve core 5 between the transmission end and the air guide groove 501. The sliding sealing assembly includes a first sealing ring 41, and the sliding sealing assembly is in sliding sealing cooperation with the inner wall of the sealing ring protrusion 1024.

[0035] The drive assembly engages with the transmission end of the valve core 5 to drive the valve core 5 to move axially within the valve cavity, thereby enabling the valve core 5 to have a position that seals the valve core sealing gasket 3 with the sealing ring protrusion 1024, thus blocking the air flow of the guide cavity 10241 and the adjustment cavity 1025. Additionally, the valve core 5 has a position that separates the valve core sealing gasket 3 from the sealing ring protrusion 1024, thereby enabling the air guide groove 501 to open the air flow of the guide cavity 10241 and the adjustment cavity 1025.

[0036] When in use, when the valve core is in the air-blocking position, the valve core sealing gasket and the sealing ring convex seal to ensure the sealing of the guide cavity; during the process of the drive assembly driving the valve core to move axially (towards the adjustment cavity), the sliding sealing assembly always seals with the inner wall of the guide cavity to prevent air leakage into the transmission cavity. The adjustment end of the valve core drives the valve core sealing gasket away from the sealing ring convex (releasing the seal). At this time, the valve core is in the air-guiding position and guides the air intake channel, guide cavity and adjustment cavity through the air-guiding groove.

[0037] In one embodiment, at least two sets of sliding sealing components 4 are provided on the valve core 5 at intervals, and the at least two sets of sliding sealing components 4 are distributed between the transmission end of the valve core 5 and the air guide groove 501 and slide and seal with the inner wall of the sealing ring protrusion 1024, which can form a double or multiple seal.

[0038] In one embodiment, the valve core 5 is provided with an annular groove for installing the sliding sealing assembly 4. The sliding sealing assembly 4 further includes a second sealing ring 42 embedded in the outer periphery of the valve core 5 and located on the outer periphery of the first sealing ring 41. The second sealing ring 42 slides and seals with the inner wall of the sealing ring protrusion 1024.

[0039] Furthermore, the first sealing ring 41 and the second sealing ring 42 are independent of each other. The first sealing ring 41 has a circular cross-section, and the outer circumference of the second sealing ring 42 is adapted to the inner wall of the sealing ring protrusion 1024 to form a surface-to-surface contact fit. Specifically, the outer circumference of the valve core 5 is provided with an annular groove, and both the first sealing ring 41 and the second sealing ring 42 are embedded in the annular groove. The outer circumference of the second sealing ring 42 is an annular surface, which is adapted to the inner wall of the sealing ring protrusion 1024 to form a surface-to-surface contact fit. The second sealing ring 42 and the vicinity of the annular groove have a gap (very small) for lubricating grease to be immersed, so that the sliding sealing assembly meets the friction characteristics requirements within the design range while ensuring sealing.

[0040] In one embodiment, the adjustment cavity 1025 is provided with a current value calibration component. The current value calibration component includes a valve core adjusting nut 2 connected to the adjustment end of the valve core 5, a spring adjusting plate 1 connected to the adjustment cavity 1025 (the spring adjusting plate 1 is a frame structure, only used for limiting and not closing the adjustment cavity 1025), and a second valve core spring 52 limited between the valve core adjusting nut 2 and the spring adjusting plate 1. The relative position of the spring adjusting plate 1 and the adjustment cavity 1025 is adjustable, thereby adjusting the initial compression of the second valve core spring 52. After limiting the initial compression of the second valve core spring 52, the drive component needs to reach a certain pushing force before it can push the valve core 5. The drive component driven by the power supply needs to reach a preset current value (calibration value) before it can push the valve core 5 to move.

[0041] Specifically, the adjusting cavity 1025 has a connecting part with an internal thread. The spring adjusting plate 1 is threadedly connected to the connecting part of the adjusting cavity 1025. The spring adjusting plate 1 can be a simple frame or plate structure, or a cylindrical structure with a vent. The spring adjusting plate 1 is only used to limit the second valve core spring 52.

[0042] Furthermore, the valve core sealing gasket 3 is sleeved on the valve core 5 and located on the side of the valve core adjusting nut 2 near the guide cavity 10241. When the air guide groove 501 is in the air-blocking position, the valve core sealing gasket 3 contacts and cooperates with the side wall of the sealing ring protrusion 1024 to seal the guide cavity 10241. A valve core sealing ring 31 is provided between the end of the valve core adjusting nut 2 near the guide cavity 10241 and the valve core 5 to ensure the sealing between the valve core adjusting nut 2 and the valve core 5 when the air guide groove 501 is in the air-blocking position.

[0043] In one embodiment, a first sealing port 1034 is provided between the pressure relief port 1032 and the guide cavity 10241. The pressure relief assembly includes a piston 9 disposed between the first sealing port 1034 and the pressure relief port 1032. The piston 9 has an elastic fin 91, which opens or seals the first sealing port 1034 under air pressure. (Refer to...) Figure 2 and Figure 3As shown, the piston 9 has a pressure relief port in the middle. When the air pressure below the piston 9 is greater than the air pressure above the piston 9, the gas below the piston 9 pushes against the elastic fin 91 to open the first sealing port 1034. At the same time, the sealing surface of the piston 9 is in close contact with the pressure relief port 1032 to seal, allowing the execution chamber 1033 to be pressurized. When the air pressure below the piston 9 is less than or equal to the air pressure above the piston 9, the gas above the piston 9 pushes against the elastic fin 91 to block the first sealing port 1034. At the same time, the sealing surface of the piston 9 separates from the pressure relief port 1032, opening the pressure relief port 1032, and the execution chamber 1033 exhausts and depressurizes through the pressure relief port 1032. The above-described method of opening or blocking the first sealing port 1034 is only one feasible embodiment. The opening and closing of the gas flow channel by cooperating with the piston through air pressure is existing technology. Those skilled in the art can design their own or refer to the piston structure of other valves.

[0044] In one embodiment, the valve body includes a detachably connected front valve body 102 and a rear valve plate 103. The air intake channel 1021 is disposed on the front valve body 102, and the exhaust channel 1035 is disposed on the rear valve plate 103. The front valve body 102 has a valve cavity for accommodating the valve core 5, and the connection surface between the front valve body 102 and the rear valve plate 103 has a first sealing port 1034 (exposing the valve cavity). The exhaust channel 1035 is provided with a lift valve 1031, which rises or falls under the action of air pressure to control the connection or blockage between the regulating cavity 1025 and the exhaust channel 1035. A front valve body sealing ring 1023 is provided at the connection between the front valve body 102 and the rear valve plate 103 to ensure a sealed connection between the two. The front valve body 102 and the rear valve plate 103 are separately disposed, which facilitates the replacement or adjustment of the valve core and related parts in the valve cavity.

[0045] In one embodiment, the drive assembly includes a motor end cap 101 connected to the front valve body 102, a motor assembly 7, and a slider 6 driven by the motor assembly 7. An end cap sealing ring 8 is provided at the connection between the motor end cap 101 and the front valve body 102. A first valve core spring 51 is provided between the transmission end of the valve core 5 and the slider 6 for limiting. The motor assembly 7 drives the slider 6 to compress the first valve core spring 51 and then drives the transmission end of the valve core 5. The first valve core spring 51 can ensure the relative position of the valve core and the drive assembly during initial installation, as well as the reset of the slider 6.

[0046] The control principle of existing proportional control valves is well known to those skilled in the art. Those skilled in the art can also refer to Chinese utility model patent with publication number CN210014029U (titled "A hydraulic retarder control valve"), or other published documents or patents; the following is only a brief description based on the accompanying drawings and the sealing structure in this technical solution, and does not limit the technical solution of this invention.

[0047] After the motor assembly 7 is energized, it adjusts the stroke according to the current magnitude (the pre-compression of the second valve core spring is used to preset the calibration current value, and the current magnitude controls the thrust of the motor push rod; the greater the thrust, the longer the movement of the valve core driven by the motor assembly 7). The motor push rod drives the slider 6 to move. As the current increases, it gradually overcomes the elasticity of the first valve core spring 51, causing the sealing surface of the slider 6 to contact the valve core 5, sealing the transmission end of the hollow valve core 5. Then, as the current continues to increase, it gradually pushes the valve core 5 to move axially, causing the sealing surface of the valve core sealing gasket 3 and the sealing ring protrusion 1024 to separate, forming a gap. The gas from the air supply source enters from the air intake channel 1021, passes through the air guide groove and this gap, and enters the regulating chamber, entering the side of the piston 9 facing the regulating chamber. As the air volume in the intake channel 1021 increases, the piston 9 is compressed to further block the pressure relief port 1032 on the rear valve plate 103. The elastic fins 91 of the piston 9 deform due to air pressure, opening the first sealing port 1034, allowing gas to enter the execution chamber 1033 to control the actuator's action. As the current continues to increase, the valve core sealing gasket 3 moves further away from the side of the sealing ring protrusion 1024, increasing the flow channel between the intake channel 1021 and the regulating chamber 1025 connected by the air guide groove 501, thereby increasing the air pressure in the execution chamber 1033. At the same time, the lift valve 1031 is connected to the execution chamber 1033 through an air circuit. After the air pressure in the execution chamber 1033 exceeds the threshold, the lift valve 1031 will be pushed open, and the gas will be discharged from the exhaust channel 1035, balancing the pressure in the execution chamber 1031.

[0048] As the current of motor assembly 7 gradually decreases, the thrust of the motor push rod gradually decreases. The air pressure on the side of the slider 6 that is against the valve core 5 (the valve core is hollow, and the air pressure inside the valve core is the same as the air pressure inside the regulating chamber) and the first valve core spring 51 will push the slider 6 towards the motor assembly 7, causing the sealing surface of the slider 6 to separate from the transmission end of the hollow valve core 5. This allows the gas inside the valve core 5 and the regulating chamber to be quickly discharged from the transmission chamber to the outside of the valve body (the transmission chamber is connected to the outside of the valve body through a gas channel). At the same time, the second valve core spring 52 will also push the valve core adjusting nut. 2 (Valve core adjusting nut 2 is threadedly connected to valve core 5) moves towards the direction of the sealing ring protrusion 1024, causing the valve core 5 to move, thereby sealing the valve core sealing gasket 3 and the sealing ring protrusion 1024; at this time, due to the rapid decrease in pressure on the side of piston 9 near the valve core (i.e., the air pressure in the regulating chamber), the air pressure in the actuating chamber 1033 will push piston 9 to move slightly or deform towards the regulating chamber to open the pressure relief port 1032. In this way, the actuating chamber 1033 is connected to the pressure relief port 1032, and the pressure relief port 1032 is connected to the exhaust passage 1035, completing the exhaust pressure relief.

[0049] For the operating principle of similar proportional control valves with hollow valve cores, please refer to the utility model patent with application number 202321350661.8 (title: A proportional solenoid valve for a hydraulic retarder). Regarding the design of the actuation chamber, pressure relief component and exhaust channel, there are already mature technical solutions in this field. Those skilled in the art can select appropriate gas flow channels and pressure relief components. This technical solution will not be described in detail or have specific limitations.

[0050] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0051] In the description of this application, the reference to terms such as "this embodiment," "an embodiment," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A proportional control valve for air pressure regulation, comprising a driving assembly, a valve body having an air inlet channel (1021), an air outlet channel (1035) and a valve cavity for accommodating a valve core (5), characterized in that: the inner wall of the valve cavity is provided with a sealing ring protrusion (1024) at the position communicating with the air inlet channel (1021), the valve cavity comprises a guide cavity (10241) for limiting the radial position of the valve core (5) and formed by the sealing ring protrusion (1024), and an adjusting cavity (1025) and a transmission cavity (1026) respectively located on both sides of the guide cavity (10241); the middle section of the valve core (5) is provided with a gas guide groove (501) communicating with the air inlet channel (1021), and both ends of the valve core (5) are respectively an adjusting end extending into the adjusting cavity (1025) and a transmission end extending into the transmission cavity (1026); the adjusting end is sleeved with a valve core sealing gasket (3), and a sliding sealing assembly is sleeved on the valve core (5) between the transmission end and the gas guide groove (501), the sliding sealing assembly comprises at least one sealing ring, and the sliding sealing assembly is in sliding sealing cooperation with the inner wall of the sealing ring protrusion (1024); the driving assembly is in transmission cooperation with the transmission end of the valve core (5), the valve core (5) has a gas blocking position at which the valve core sealing gasket (3) is in sealing cooperation with the sealing ring protrusion (1024) to block the guide cavity (10241) and the adjusting cavity (1025), and the valve core (5) has a gas guiding position at which the valve core sealing gasket (3) is separated from the sealing ring protrusion (1024) to guide the gas guide groove (501) to communicate with the guide cavity (10241) and the adjusting cavity (1025). At least two groups of sliding sealing assemblies (4) are arranged on the valve core (5) at intervals, and the at least two groups of sliding sealing assemblies (4) are distributed between the transmission end of the valve core (5) and the gas guide groove (501) and are in sliding sealing cooperation with the inner wall of the sealing ring protrusion (1024). The sliding sealing assembly (4) is embedded in the outer periphery of the valve core (5), the sliding sealing assembly (4) comprises a first sealing ring (41) and a second sealing ring (42) located in the outer periphery of the first sealing ring (41), and the second sealing ring (42) is in sliding sealing cooperation with the inner wall of the sealing ring protrusion (1024). The first sealing ring (41) and the second sealing ring (42) are independent of each other, the cross section of the first sealing ring (41) is circular, and the outer periphery of the second sealing ring (42) is adapted to the inner wall of the sealing ring protrusion (1024) to form a face-to-face contact cooperation. An electric current value calibration assembly is arranged in the adjusting cavity (1025), the electric current value calibration assembly comprises a valve core adjusting nut (2) connected to the adjusting end of the valve core (5), a spring adjusting pressure plate (1) connected with the adjusting cavity (1025), a second valve core spring (52) limited between the valve core adjusting nut (2) and the spring adjusting pressure plate (1), and the relative position between the spring adjusting pressure plate (1) and the adjusting cavity (1025) is adjustable to adjust the initial compression amount of the second valve core spring (52).

2. The proportional control valve for air pressure regulation according to claim 1, characterized in that: ​ 3. Proportional control valve for air pressure regulation according to claim 1 or 2, characterized in that: ​ 4. The proportional control valve for air pressure regulation according to claim 3, characterized in that: ​ 5. The proportional control valve for air pressure regulation of claim 1, wherein: ​ 6. The proportional control valve for air pressure regulation according to claim 5, characterized in that: The adjusting cavity (1025) has a connecting part provided with a thread, and the spring adjusting pressure plate (1) is screwed on the connecting part of the adjusting cavity (1025).

7. The proportional control valve for air pressure regulation of claim 5, wherein: The valve core sealing gasket (3) is sleeved on the valve core (5) and located on the side of the valve core adjusting nut (2) close to the guide cavity (10241), and the valve core sealing gasket (3) is in contact with the side wall of the sealing ring convex (1024) when the air guide groove (501) is located at the air blocking position. A valve core sealing ring (31) is arranged between the end of the valve core adjusting nut (2) close to the guide cavity (10241) and the valve core (5).

8. The proportional control valve for air pressure regulation of claim 1, wherein: A pressure relief assembly is arranged between the valve cavity and the exhaust passage (1035), the exhaust passage (1035) and the adjusting cavity (1025) have a first sealing opening (1034), the pressure relief assembly comprises a piston (9) arranged between the first sealing opening (1034) and the guide cavity (10241), the piston (9) has an elastic peripheral wing (91), and the elastic peripheral wing (91) is opened or blocked to the first sealing opening (1034) under the action of air pressure.

9. The proportional control valve for air pressure regulation of claim 1, wherein: The valve body comprises a front valve body (102) and a rear valve plate (103) arranged separately and connected, the valve cavity is located in the front valve body (102), the exhaust passage (1035) is arranged on the rear valve plate (103), and the exhaust passage (1035) is provided with a poppet valve (1031), the poppet valve (1031) is raised or lowered under the action of air pressure to control the conduction or blockage of the exhaust passage (1035).

10. The proportional control valve for air pressure regulation of claim 1, wherein: The driving assembly comprises a motor assembly (7) and a sliding block (6) driven by the motor assembly (7), a first valve core spring (51) is arranged in position between the transmission end of the valve core (5) and the sliding block (6), the motor assembly (7) drives the sliding block (6) to compress the first valve core spring (51), and the transmission end of the valve core (5) is driven.

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