A sliding two-position three-way valve

Abstract

This invention discloses a sliding two-position three-way valve, relating to the field of pneumatic valve technology. It includes a valve body and a valve core. The valve body has an internal receiving cavity, in which the valve core is axially movable. A partition is formed within the valve body, dividing the receiving cavity into two flow chambers. A through-hole is formed on the partition connecting the two flow chambers. The valve core passes through the through-hole, with a gap between the valve core and the inner wall of the through-hole. A flow channel is formed on the partition. Two sealing discs extend radially from the portion of the valve core outside the through-hole, located on opposite sides of the partition. A gap exists between the sealing discs and the inner wall of the valve body. When the sealing discs abut against the partition, they seal the through-hole. The beneficial effect of this invention is that the valve core only needs to abut against the partition to seal the through-hole during movement, preventing a decrease in sealing performance due to friction during long-term use.

Description

Technical Field

[0001] This invention relates to the field of air valve technology, and in particular to a sliding two-position three-way valve. Background Technology

[0002] In the field of pneumatic control, slide valves are commonly used. A slide valve includes a valve body and a valve core located inside the valve body and capable of moving within the valve body. The valve body has multiple air holes spaced apart along the axial direction. The valve core has a protrusion that abuts against the inner wall of the valve body. The protrusion divides the space inside the valve body into multiple spaces, and each space is connected to at least two air holes. The different air holes are connected by the movement of the valve core within the valve body.

[0003] In this method, the sealing between the multiple spaces separated by the protrusion of the valve core in the valve body is achieved by the protrusion abutting against the inner wall of the valve body. Usually, a sealing ring is fitted on the protrusion and fits tightly against the inner wall of the valve body to ensure the sealing between different spaces.

[0004] However, since the valve core moves continuously within the valve body during operation, the protruding part of the valve core will rub against the inner wall of the valve body. After prolonged use, the wear of the sealing ring will lead to insufficient sealing performance, making it prone to internal gas leakage, cross-contamination, and insufficient sealing reliability. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a sliding two-position three-way valve to solve the above-mentioned technical problems.

[0006] This invention provides a sliding two-position three-way valve, including a valve body and a valve core. The valve body has a receiving cavity inside, and the valve core is movably installed in the receiving cavity along the axial direction of the valve body. A partition is formed inside the valve body, which divides the receiving cavity into two flow guiding cavities distributed along the axial direction of the valve body. A through hole is provided on the partition to connect the two flow guiding cavities. A flow guiding channel is formed on the valve body to connect the receiving cavity and the outside of the valve body. The flow guiding cavity is connected to at least one of the flow guiding channels. The valve core is inserted into the perforation, and there is a gap between the valve core and the inner wall of the perforation. A flow guiding channel is formed on the partition. Two sealing discs extend radially on the part of the valve core outside the perforation. The distance between the two sealing discs is greater than the length of the partition in the axial direction of the valve body, and they are located on opposite sides of the partition. There is a gap between the sealing discs and the inner wall of the valve body. When the sealing discs abut against the partition, they block the perforation.

[0007] Optionally, the size of the perforation is smaller than the size of the sealing disc, and the sealing disc abuts against the partition to block the perforation.

[0008] Optionally, a flange extends on the side of the partition toward the direction of the sealing disc, the flange surrounds the perforation, and the partition blocks the perforation by abutting against the sealing disc through the flange.

[0009] Optionally, a rubber pad is provided on the sealing disc of the valve core, and the sealing disc abuts against the flange through the rubber pad.

[0010] Optionally, one end face of the valve body in the axial direction is an unclosed end face, and the unclosed end face of the valve body constitutes one of the flow guiding channels.

[0011] Optionally, sealing grooves are formed on the outer wall of the valve body at the locations on opposite sides of the partition.

[0012] Optionally, the valve body may also include a drive assembly, wherein a connection hole is provided at one axial end of the valve body, the drive assembly is connected to the valve core through the connection hole, and the drive assembly drives the valve core to move axially within the valve body.

[0013] Optionally, the drive assembly includes a moving iron, a stationary iron, an elastic reset member, and an electromagnetic coil. The elastic reset member is connected between the moving iron and the stationary iron, and the electromagnetic coil is used to magnetize the moving iron and the stationary iron. An assembly portion extends from the moving iron and is movably inserted into the connecting hole. An assembly hole is provided on the assembly portion, and the end of the valve core is inserted into the assembly hole and kept relatively fixed to the moving iron.

[0014] Optionally, the assembly part is provided with a sealing ring, and the assembly part abuts against the inner wall of the connecting hole through the sealing ring.

[0015] Optionally, the moving iron has two opposite ends, the mounting part is located at one end of the moving iron, and the other end of the moving iron is formed with a mounting groove for mounting the elastic reset member, and the mounting groove communicates with the mounting hole.

[0016] The beneficial effects of the present invention are as follows: by forming a perforated partition in the valve body, and connecting the flow guide cavities on both sides of the partition through the perforation, the sealing method between different flow guide cavities is to seal the perforation of the partition by the sealing disc on the valve core, without having to seal by having the sealing disc on the valve core adhere to the inner wall of the valve body. During the movement of the valve core, it only needs to abut against the partition to seal the perforation, and there will be no problem of decreased sealing performance due to friction during long-term use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a sliding two-position three-way valve according to the present invention.

[0019] Figure 2 This is a schematic diagram of another state of a sliding two-position three-way valve according to the present invention.

[0020] In the picture: Valve body 10, first end face 11, second end face 12, partition 13, through hole 131, flange 132, guide cavity 14, sealing groove 15, guide hole 16; Valve core 20, sealing disc 21; Moving iron 30, assembly part 31, assembly hole 311, assembly slot 312; Static iron 40; 50. Elastic reset element. Detailed Implementation

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0022] Unless otherwise explicitly specified and limited, the terms "setup," "installation," and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms based on the specific circumstances.

[0023] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0025] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides a sliding two-position three-way valve, including a valve body 10, a valve core 20, and a drive assembly. The two axially opposite end faces of the valve body 10 are a first end face 11 and a second end face 12, respectively. The first end face 11 of the valve body 10 is a closed end face, and the second end face 12 of the valve body 10 is an unclosed end face. The valve body 10 has a receiving cavity between the first end face 11 and the second end face 12 for accommodating the valve core 20.

[0027] The valve core 20 is generally rod-shaped and is movably mounted in the receiving cavity along the axial direction of the valve body 10. The drive assembly is used to drive the valve core 20 to move within the valve body 10. A partition 13 is formed on the inner wall of the valve body 10, dividing the receiving cavity into two flow guide chambers 14 distributed along the axial direction of the valve body 10. The partition 13 has a through hole 131 connecting the two flow guide chambers 14. A flow guide channel is formed on the valve body 10, connecting the flow guide chambers 14 and the outside of the valve body 10. The flow guide chambers 14 are connected to at least one flow guide channel. The flow guide channel of the lower flow guide chamber 14 in the figure is a flow guide hole 16 opened on the side wall of the valve body 10. The flow guide chamber 14 located at the upper end of the figure is formed by the second end face 12 of the valve body 10, and the gas in the flow guide chamber 14 can flow out from the unsealed second end face 12 of the valve body 10.

[0028] The valve core 20 is movably inserted into the perforation 131, and there is a gap between the valve core 20 and the inner wall of the perforation 131, allowing airflow to pass between the valve core 20 and the inner wall of the perforation 131. A flow guide channel is formed on the side wall of the valve body 10 corresponding to the partition 13. The flow guide channel on the partition 13 is a flow guide hole 16, which connects the outside of the valve body 10 and the gap between the valve core 20 and the inner wall of the perforation 131. Furthermore, two sealing discs 21 extend radially on the portion of the valve core 20 outside the perforation 131. The two sealing discs 21 are spaced apart along the axial direction of the valve core 20, and the distance between the two sealing discs 21 is greater than the length of the partition 13 in the axial direction of the valve body 10. The two sealing discs 21 are located on opposite sides of the partition 13. After the drive assembly drives the valve core 20 to move, one sealing disc 21 always abuts against the partition 13. There is a gap between the sealing disc 21 and the inner wall of the valve body 10, so that the airflow can flow between the sealing disc 21 and the inner wall of the valve body 10 to the perforation 131 of the partition 13. When the sealing disc 21 moves with the valve core 20 and abuts against the partition 13, the sealing disc 21 blocks the perforation 131, thereby blocking the airflow between the two guide chambers 14.

[0029] Figure 1 and Figure 2 These are schematic diagrams showing the state of the valve core 20 in two working positions. In the diagram, the guide hole 16 at P is the air inlet, and the guide hole 16 at A is located on the partition 13, which serves as the working port to connect with the actuator. T is the gap between the sealing disc 21 and the valve body 10, which connects with the second end face 12 of the valve body 10 and serves as the exhaust port.

[0030] Figure 1 Driven by the drive assembly, the lower sealing disc 21 abuts against the partition 13. At this time, the lower guide cavity 14 cannot communicate with the upper guide cavity 14 because the sealing disc 21 blocks the partition 13. At this time, the air inlet P is isolated from the working port A and the exhaust port T. There is a gap between the upper sealing disc 21 and the partition 13. At this time, the working port A on the partition 13 is connected to the exhaust port T. The airflow flows into the valve from the working port A and is stably output from the exhaust port T, realizing the exhaust pressure relief state.

[0031] Figure 2 Driven by the drive assembly, there is a gap between the lower sealing disc 21 and the partition 13, and the upper sealing disc 21 abuts against the partition 13. At this time, the air inlet P is connected to the working port A, and the air inlet P and the working port A are isolated from the exhaust port T, thus completing the air supply and pressurization action.

[0032] In the sliding two-position three-way valve provided in this embodiment, a partition 13 is formed inside the valve body 10 to divide the accommodating space inside the valve body 10 into two guide chambers 14, and the two guide chambers 14 are connected by a perforation 131 in the partition 13. An air passage is formed in the gap between the sealing disc 21 and the inner wall of the valve body 10, and in the gap between the valve core 20 and the inner wall of the perforation 131, allowing airflow to flow between the two guide chambers 14. When the sealing disc 21 of the valve core 20 blocks the perforation 131 on the partition 13, it can block the airflow between the two guide chambers 14, thereby controlling the flow of airflow by moving the valve core 20. In the sliding two-position three-way valve provided in this embodiment, the valve core 20 is not sealed by adhering to the inner wall of the valve body 10, so there is no problem of decreased sealing performance due to friction wear during long-term use.

[0033] Furthermore, in this embodiment, the size of the perforation 131 of the partition 13 is smaller than the size of the sealing disc 21, and the sealing disc 21 abuts against the partition 13 to seal the perforation 131. That is, the valve core 20 does not move into the perforation 131 of the partition 13 to seal the perforation 131 during its movement, but rather the sealing disc 21 seals the perforation 131 by abutting against the side of the partition 13. This sealing method also does not require the sealing disc 21 to be in contact with the inner wall of the perforation 131, but only requires the sealing disc 21 to abut against the partition 13. There is no friction between the valve core 20 and the valve body 10 during its movement, thereby ensuring the sealing performance.

[0034] Furthermore, a flange 132 extends from the side of the partition 13 toward the sealing disc 21, surrounding the through hole 131. The partition 13 abuts against the sealing disc 21 through the flange 132, thus sealing the through hole 131. By configuring the flange 132, the surface contact between the sealing disc 21 and the partition 13 is changed to a line contact, which improves the sealing effect on the through hole 131 of the partition 13. Moreover, to further improve the sealing effect, a rubber gasket is provided on the sealing disc 21 of the valve core 20. The sealing disc 21 abuts against the flange 132 through the rubber gasket. When the flange 132 abuts against the rubber gasket, the rubber gasket can deform to fit the flange 132, and the flange 132 is squeezed into the rubber gasket, further ensuring the sealing effect.

[0035] Meanwhile, two sealing grooves 15 are formed on the outer side wall of the valve body 10 at the opposite sides of the partition 13. A sealing ring can be installed in the sealing groove 15. When the valve body 10 is installed in an external device, the sealing ring abuts against the external device to ensure sealing.

[0036] Typically, in a spool valve, the movement of the valve core is achieved by a moving iron on the valve core, stationary irons on both sides of the valve body, and an electromagnetic coil. A spring is placed between each end of the valve core and the stationary irons. When the electromagnetic coil is not energized, the spring's elastic force holds the moving iron in its initial position. To move the valve core, one side of the electromagnetic coil is energized to magnetize both the moving and stationary irons. The magnetized irons attract each other, driving the moving iron to move, which in turn moves the valve core. However, in this method, the moving and stationary irons are relatively far apart, and the movement response of the moving iron after magnetization is not rapid enough.

[0037] Therefore, in this embodiment, the driving component drives the valve core 20 to move, such as... Figure 1 As shown, a connecting hole is provided on the first end face 11 of the valve body 10. The drive assembly is connected to the valve core 20 through the connecting hole, and the drive assembly drives the valve core 20 to move axially within the valve body 10. The drive assembly includes a moving iron 30, a stationary iron 40, an elastic reset member 50, and an electromagnetic coil (not shown). The moving iron 30 is slidably disposed in the connecting hole and fixedly connected to the valve core 20. The stationary iron 40 is disposed outside the valve body 10. The elastic reset member 50 is connected between the moving iron 30 and the stationary iron 40. The elastic reset member 50 is a spring, and its elasticity maintains a certain distance between the moving iron 30 and the stationary iron 40. In the initial state, the elastic reset member 50 keeps the valve core 20 in a closed position below. The sealing plate 21 remains against the partition 13. The electromagnetic coil is used to magnetize the moving iron 30 and the stationary iron 40. After the electromagnetic coil is energized and magnetizes the moving iron 30 and the stationary iron 40, the moving iron 30 and the stationary iron 40 are attracted by magnetism, driving the moving iron 30 to overcome the elastic force of the elastic reset member 50 and move towards the stationary iron 40. This causes the moving iron 30 to drive the valve core 20 to move, so that the sealing plate 21 located at the bottom of the valve core 20 is disengaged from the partition 13, while the sealing plate 21 located at the top is against the partition 13.

[0038] By connecting the moving iron 30 to the end of the valve core 20, and then connecting the elastic reset member 50 between the moving iron 30 and the stationary iron 40 located outside the valve body 10, the distance between the moving iron 30 and the stationary iron 40 can be reduced. For example, in the initial state, the moving iron 30 and the stationary iron 40 maintain a distance of 1 mm. After the electromagnetic coil magnetizes the moving iron 30 and the stationary iron 40, the moving iron 30 can quickly respond and overcome the elastic force of the elastic reset member 50 to move towards the stationary iron 40. Since the moving iron 30 is fixedly connected to the valve core 20, the movement of the moving iron 30 will also drive the valve core 20 to move together. During the movement of the valve core 20, the sealing disc 21 on the valve core 20 also moves together, causing the lower sealing disc 21 to disengage from the partition 13, while the upper sealing disc 21 abuts against the partition 13 (see reference). Figure 2After the electromagnetic coil is de-energized, the elastic reset member 50, under its elastic restoring action, drives the moving iron 30 to move away from the stationary iron 40. During the movement of the moving iron 30, it also drives the sealing disc 21 of the valve core 20 to move together, so that the lower sealing disc 21 abuts against the partition 13, and the upper sealing disc 21 disengages from the partition 13 (see reference). Figure 1 This method allows the valve core 20 to respond quickly to the electromagnetic coil, and only requires one moving iron 30, one stationary iron 40, and one elastic reset element 50, instead of having stationary irons 40 and elastic reset elements 50 on opposite sides of the valve core 20 in the axial direction, thus simplifying the structure.

[0039] Because there is a gap between the sealing disc 21 of the valve core 20 and the inner wall of the valve body 10, and a gap between the valve core 20 and the inner wall of the through hole 131 of the partition 13, the valve core 20 cannot guarantee that its movement path is always on the same axis when it moves within the valve body 10. Therefore, in this embodiment, the moving iron 30 has two opposing ends. An assembly part 31 extends from the end of the moving iron 30 closest to the partition 13. The assembly part 31 is movably inserted into the connecting hole of the first end face 11 of the valve body 10. A sealing ring is provided on the outer surface of the assembly part 31. The assembly part 31 abuts against the inner wall of the connecting hole through the sealing ring to ensure sealing. An assembly hole 311 is provided on the assembly part 31. The end of the valve core 20 passes through the assembly hole 311 and remains relatively fixed to the moving iron 30. In this embodiment, the end of the valve core 20 and the assembly hole 311 of the assembly part 31 are press-fitted into the assembly hole 311. The end of the valve core 20 is fixedly connected to the assembly part 31 of the moving iron 30 by an interference fit, and the assembly part 31 of the moving iron 30 slides through the connecting hole. This ensures that the valve core 20 is always on a single axis during movement. That is, during movement, the sealing disc 21 on the valve core 20 will not contact the inner wall of the valve body 10, and the valve body 10 will not contact the inner wall of the through hole 131 in the partition part 13.

[0040] Furthermore, the other end of the moving iron 30 has a mounting groove 312 for mounting the elastic reset member 50, and the surface of the stationary iron 40 facing the moving iron 30 also has a groove. The two ends of the elastic reset member 50 are respectively connected to the mounting groove 312 of the moving iron 30 and the groove of the stationary iron 40, and the mounting groove 312 of the moving iron 30 is connected to the mounting hole 311. This allows the air in the mounting hole 311 to flow out through the mounting groove 312 when the valve core 20 is pressed into the mounting hole 311 of the moving iron 30, thus avoiding the difficulty in pressing the valve core 20 into the mounting hole 311 of the moving iron 30 due to the compression of air in the mounting hole 311.

[0041] In summary, the sliding two-position three-way valve provided in this embodiment seals the through hole 131 connecting the adjacent guide chamber 14 by having the sealing disc 21 of the valve core 20 abut against the partition 13. During the process of the valve core 20 moving to connect the working port A with the inlet port P and the exhaust port T, there is no friction between the valve core 20 and the valve body 10, resulting in a longer service life. Furthermore, by fixing the moving iron 30 to the end of the valve core 20 and setting the stationary iron 40 outside the valve body 10, the moving iron 30 and the stationary iron 40 are kept at a close distance. After the electromagnetic coil magnetizes the moving iron 30 and the stationary iron 40, they can quickly attract each other, thereby driving the valve core 20 to respond quickly. Moreover, this method only requires one stationary iron 40 and one electromagnetic coil, simplifying the structure. The extended mounting part 31 on the moving iron 30 is slidably disposed in the connecting hole of the valve body 10, ensuring that the valve core 20 remains on the same axis during movement, avoiding friction between the valve core 20 and the valve body 10.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A sliding two-position three-way valve, characterized in that: The valve includes a valve body (10) and a valve core (20). The valve body (10) has a receiving cavity inside. The valve core (20) is movably installed in the receiving cavity along the axial direction of the valve body (10). A partition (13) is formed inside the valve body (10). The partition (13) divides the receiving cavity into two flow guide cavities (14) distributed along the axial direction of the valve body (10). A through hole (131) is provided on the partition (13) to connect the two flow guide cavities (14). A flow guide channel P is formed on the valve body (10) to connect the receiving cavity and the outside of the valve body (10). The flow guide cavity (14) is connected to at least one of the flow guide channels P. The valve core (20) is inserted into the perforation (131). There is a gap between the valve core (20) and the inner wall of the perforation (131). A flow channel A is formed on the partition (13). Two sealing discs (21) extend radially on the part of the valve core (20) outside the perforation (131). The distance between the two sealing discs (21) is greater than the length of the partition (13) in the axial direction of the valve body (10). They are located on opposite sides of the partition (13). There is a gap between the sealing discs (21) and the inner wall of the valve body (10). When the sealing discs (21) abut against the partition (13), the sealing discs (21) block the perforation (131). The size of the perforation (131) is smaller than the size of the sealing disc (21). The sealing disc (21) abuts against the partition (13) to block the perforation (131). A flange (132) extends from the side of the partition (13) toward the sealing disc (21). The flange (132) surrounds the perforation (131). The partition (13) abuts against the sealing disc (21) through the flange (132) to block the perforation (131). A rubber gasket is provided on the sealing disc (21) of the valve core (20). The rubber pad abuts against the flange (132), and the end face of one end of the valve body (10) in the axial direction is an unclosed end face. The unclosed end face of the valve body (10) forms a flow channel T. Sealing grooves (15) are formed on the outer side wall of the valve body (10) on the opposite sides of the partition (13). The valve body (10) also includes a drive assembly. A connection hole is provided at one end of the valve body (10) in the axial direction. The drive assembly is connected to the valve core (20) through the connection hole. The drive assembly drives the valve core (20) to move in the valve body (10) along the axial direction.

2. The sliding two-position three-way valve according to claim 1, characterized in that: The drive assembly includes a moving iron (30), a stationary iron (40), an elastic reset member (50), and an electromagnetic coil. The elastic reset member (50) is connected between the moving iron (30) and the stationary iron (40). The electromagnetic coil is used to magnetize the moving iron (30) and the stationary iron (40). An assembly part (31) extends from the moving iron (30). The assembly part (31) is movably inserted into the connecting hole. An assembly hole (311) is provided on the assembly part (31). The end of the valve core (20) is inserted into the assembly hole (311) and remains relatively fixed to the moving iron (30).

3. The sliding two-position three-way valve according to claim 2, characterized in that: The assembly part (31) is provided with a sealing ring, and the assembly part (31) abuts against the inner wall of the connecting hole through the sealing ring.

4. The sliding two-position three-way valve according to claim 2, characterized in that: The moving iron (30) has two opposite ends. The mounting part (31) is located at one end of the moving iron (30). The other end of the moving iron (30) is formed with a mounting groove (312) for mounting the elastic reset member (50), and the mounting groove (312) is connected to the mounting hole (311).

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