Pilot valve assembly

Abstract

The utility model discloses a pilot valve assembly which comprises a pilot valve body, and the pilot valve body is provided with a pressure maintaining chamber and a pressure relief chamber which are communicated with each other. The pilot valve body is further provided with a pressure maintaining channel communicating with the pressure maintaining chamber and a pressure relief channel communicating with the pressure relief chamber. The pilot valve further comprises a valve element, the valve element is provided with a working end and a driving end, the valve element penetrates through the pilot valve body from bottom to top in the vertical direction, so that the working end is located in the air chamber, the driving end is located outside the air chamber, and the working end is driven by the driving end to reciprocate in the air chamber in the vertical direction. The pilot valve further comprises a sealing ring arranged between the valve element and the pilot valve body. The sealing ring is used for sealing a radial gap between the valve element and the pilot valve body. The working end is connected with a sealing gasket, and the sealing gasket communicates or blocks the pressure maintaining chamber and the pressure relief chamber through movement of the working end; the use of pilot valve parts can be reduced, so that the use of sealing elements is reduced, the service life of the pilot valve is prolonged, and the use reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a pilot valve assembly. Background Art

[0002] The pilot valve is an important component that assists the pneumatic sprayer motor reversing mechanism in reversing. Its sealing performance and service life have a great impact on the pneumatic motor. Currently, the pilot valve has many parts, which are difficult to disassemble and maintain, and are prone to component damage and failure. In addition, in order to ensure strict sealing, a corresponding multi-sealing structure is required, which makes the structure of the pilot valve complex and seal failures often occur.

[0003] Therefore, in order to solve the above problems, a pilot valve assembly is needed that can reduce the use of pilot valve components, thereby reducing the use of seals and improving the service life and reliability of the pilot valve. Utility Model Content

[0004] In view of this, the purpose of the utility model is to overcome the defects in the prior art and provide a pilot valve assembly that can reduce the use of pilot valve components, thereby reducing the use of seals and improving the service life and reliability of the pilot valve.

[0005] The pilot valve assembly of the utility model comprises a pilot valve body, wherein the pilot valve body has an air chamber, wherein the air chamber comprises a pressure-maintaining chamber and a pressure-releasing chamber connected to each other; the pilot valve body also has a pressure-maintaining channel connected to the pressure-maintaining chamber and a pressure-releasing channel connected to the pressure-releasing chamber;

[0006] It also includes a valve core, the valve core having a working end and a driving end, the valve core is vertically arranged in the pilot valve body from bottom to top, so that the working end is located inside the air chamber, the driving end is located outside the air chamber, and the working end is driven by the driving end to reciprocate in the air chamber in the vertical direction;

[0007] It also includes a sealing ring disposed between the valve core and the pilot valve body, the sealing ring being used to seal a radial gap between the valve core and the pilot valve body;

[0008] The working end is connected with a sealing gasket, and the sealing gasket connects or blocks the pressure-maintaining chamber and the pressure-releasing chamber through the movement of the working end.

[0009] Furthermore, the pressure-maintaining channel is opened in the pilot valve body obliquely inward from bottom to top, the bottom air port of the pressure-maintaining channel is located on the bottom surface of the pilot valve body, and the top air port of the pressure-maintaining channel is located on the radial inner wall of the pressure-maintaining chamber.

[0010] Furthermore, the pressure relief channels are a plurality of channels evenly distributed in the circumferential direction of the pressure relief chamber.

[0011] Furthermore, the bottom of the pilot valve body extends radially to form a valve seat, the bottom end of the pressure relief chamber is located in the valve seat, the pressure relief channel is opened at the valve seat and communicates with the pressure relief chamber, and in the vertical direction, the bottom end of the pressure relief chamber is located at the bottom of the bottom end of the pressure relief channel.

[0012] Furthermore, the sealing gasket is arranged at the working end of the valve core through an elastic member, and the elastic member has an elastic force that enables the sealing gasket to block the pressure-maintaining channel and the pressure-releasing channel.

[0013] Furthermore, the air chamber penetrates the pilot valve body in the vertical direction, and the truncated shape of the air chamber in the vertical direction is a stepped shaft shape with a larger upper end and a smaller lower end;

[0014] The large diameter section of the stepped shaft-shaped air chamber forms a pressure-maintaining chamber, and the small diameter section of the stepped shaft-shaped air chamber forms a pressure-releasing chamber;

[0015] The top end of the pressure-maintaining chamber is closed by an upper cover, and the bottom end of the pressure-releasing chamber is closed by a valve core.

[0016] Furthermore, the sealing gasket is limited in the pressure-maintaining chamber by an elastic member, and the elastic force direction of the elastic member is parallel to the vertical direction;

[0017] A barrier ring protruding from the bottom surface of the pressure-maintaining chamber is formed on the shoulder of the stepped shaft-shaped air chamber, and the barrier ring is in a ring shape connected end to end in a radial direction;

[0018] The sealing gasket is engaged with or disconnected from the blocking ring through the movement of the working end; more specifically, the sealing gasket is engaged with the blocking ring through the movement of the working end to block the pressure holding chamber and the pressure relief chamber, or the sealing gasket is disconnected from the blocking ring through the movement of the working end to connect the pressure holding chamber and the pressure relief chamber.

[0019] Further, the bottom surface of the upper cover is recessed upward to form a receiving groove, the radial outer wall of the valve core extends outward to form a limit seat, the limit seat is upward close to the working end, the sealing gasket is limited on the limit seat by the upper fastener, and the top of the upper fastener protrudes upward to form a guide column;

[0020] The elastic member is a spring sleeved on the guide column, and the spring is supported on the bottom of the accommodating groove and the top surface of the upper fastener in the vertical direction.

[0021] Furthermore, the bottom of the pilot valve body protrudes downward to form a functional seat, the bottom of the functional seat is recessed upward to form a functional cavity, and the sealing ring is limited in the functional cavity by a lower fastener.

[0022] Furthermore, the lower fastener has a guide channel for guiding the valve core, the radial dimension of the guide channel is not less than the radial dimension of the valve core, and the radial dimension of the guide channel is substantially consistent with the radial dimension of the valve core;

[0023] The valve core is sequentially inserted through the lower fastener, the sealing ring and the pilot valve body from bottom to top, the working end extends upward into the air chamber, and the driving end extends downward from the lower fastener.

[0024] The beneficial effects of the utility model are as follows: a pilot valve assembly disclosed by the utility model, through the specific structure of the pilot valve, makes the components with the sealing function only include a sealing ring for sealing the radial gap between the valve core and the pilot valve body, and a sealing member for adjusting the connection or blocking between the pressure holding chamber and the pressure relief chamber, and the overall structure of the pilot valve is simple and compact, which can reduce the use of pilot valve components, thereby reducing the use of sealing members, and is more conducive to the disassembly and replacement of parts, thereby improving the service life and reliability of the pilot valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 This is a schematic diagram of the structure of the utility model in which the sealing gasket blocks the pressure-maintaining chamber and the pressure-releasing chamber;

[0027] Figure 2 This is a schematic diagram of the structure of the utility model in which the sealing gasket connects the pressure-maintaining chamber and the pressure-releasing chamber;

[0028] Figure 3 It is a structural schematic diagram of the pressure relief channel of the utility model;

[0029] Figure 4 For this utility model Figure 2 Schematic diagram of the structure at point A. DETAILED DESCRIPTION

[0030] Figure 1 The schematic diagram of the structure of the utility model is shown in the figure. The pilot valve assembly in the present embodiment includes a pilot valve body 1, the pilot valve body 1 is assembled on the cylinder 2, the pilot valve body 1 has an air chamber, and the air chamber includes a pressure-maintaining chamber 3 and a pressure-releasing chamber 4 connected to each other; more specifically, the air chamber penetrates the pilot valve body 1 in the vertical direction, and as shown in FIG. Figure 3 As shown, the air chamber is located at the center of the cross-section of the pilot valve body, and the section of the air chamber in the vertical direction is in the shape of a stepped shaft with a large upper end and a small lower end. The large diameter section of the stepped shaft-shaped air chamber forms a pressure holding chamber 3, and the small diameter section of the stepped shaft-shaped air chamber forms a pressure relief chamber 4; the stepped shaft-shaped air chamber structure is more conducive to machining, the quality of the pilot valve is better, the service life is longer, and the production cost is controllable; of course, the air chamber can also be formed by casting or 3D printing and other technologies, which is suitable for meeting the use function of the pilot valve, and will not be repeated here.

[0031] The pilot valve body 1 also has a pressure maintaining channel 5 connected to the pressure maintaining chamber 3 and a pressure relief channel 6 connected to the pressure relief chamber 4; the pressure maintaining channel 5 is connected to one of the air chambers of the reversing piston in the cylinder 2; the cylinder 2 used in the pneumatic sprayer motor and having a reversing piston connected to the pilot valve can be selected from any one of the existing technologies.

[0032] It also includes a valve core 7, which has a working end and a driving end. More specifically, the valve core 7 is a cylindrical structure arranged parallel to the vertical direction, and the central axis of the valve core 7 coincides with the central axis of the stepped shaft-shaped air chamber, so as to improve the reliability of the operation of the pilot valve. The top end of the valve core 7 forms the working end, and the bottom end of the valve core 7 forms the driving end. The valve core 7 is vertically penetrated from bottom to top in the pilot valve body 1, so that the working end is located in the air chamber, and the driving end is located outside the air chamber. The working end is driven by the driving end to reciprocate in the air chamber in the vertical direction; the method of driving the valve core 7 can be a structure of lifting and resetting by a mechanical arm or a cylinder 2, or lifting or resetting the valve core 7 by an elastic member 13 cooperating with a driving member, etc., so as to realize the movement of the valve core 7 in the vertical direction, which will not be repeated here;

[0033] It also includes a sealing ring disposed between the valve core 7 and the pilot valve body 1, the sealing ring is used to seal the radial gap between the valve core 7 and the pilot valve body 1; ensure the movement sealing of the valve core 7, and improve the movement stability of the valve core 7;

[0034] The working end is connected with a sealing gasket 9, and the sealing gasket 9 connects or blocks the pressure-maintaining chamber 3 and the pressure-releasing chamber 4 through the movement of the working end.

[0035] The components that perform the sealing function in this solution only include a sealing ring for sealing the radial gap between the valve core 7 and the pilot valve body 1, and a sealing gasket 9 for adjusting the connection or blocking between the pressure holding chamber 3 and the pressure relief chamber 4. The overall structure of the pilot valve is simple and compact, which can reduce the use of pilot valve components, thereby reducing the use of seals, and is more conducive to disassembly and replacement of parts, thereby improving the service life and reliability of the pilot valve.

[0036] In this embodiment, the pilot valve body 1 is in a frustum shape with gradually increasing radial dimensions from top to bottom, and the central axis of the frustum-shaped pilot valve body 1 coincides with the central axis of the air chamber, further ensuring the performance, reliability and service life of the pilot valve.

[0037] The pressure-maintaining channel 5 is opened in the pilot valve body 1 obliquely inward from bottom to top, which is convenient for processing and manufacturing. The bottom air port of the pressure-maintaining channel 5 is located on the bottom surface of the pilot valve body 1, and the top air port of the pressure-maintaining channel 5 is located on the radial inner wall of the pressure-maintaining chamber 3; the air port of the pressure-maintaining channel 5 located on the bottom surface of the pilot valve body 1 is sealed by the sealing ring Ⅰ11 and the sealing ring Ⅱ12 and is connected to the reversing piston air chamber of the cylinder 2.

[0038] In this embodiment, the bottom of the pilot valve body 1 extends radially to form a disc-shaped valve seat 10, the central axis of the valve seat 10 coincides with the central axis of the pilot valve body 1, the pilot valve body 1 is bolted to the cylinder 2 through the valve seat 10, the bottom air port of the pressure-maintaining channel 5 is located on the bottom surface of the valve seat 10, the sealing ring I11 is an O-ring, the sealing ring I11 is fastened between the valve seat 10 and the cylinder 2, and the sealing ring I11 is located radially outside the bottom air port of the pressure-maintaining channel 5 to seal it;

[0039] The bottom end of the pressure relief chamber 4 is located in the valve seat 10, and the pressure relief channel 6 is opened on the valve seat 10 and communicates with the pressure relief chamber 4. The structural layout of the valve seat 10 is not only more conducive to the sealing of the pressure holding channel 5, but also conducive to providing a longer pressure relief channel 6, and can provide a good sealing environment under the premise of non-active air intake, thereby preventing external gas and impurities from entering the pressure relief chamber 4 and affecting the operation of the valve core 7; and in the vertical direction, the bottom end of the pressure relief chamber 4 is located at the bottom of the bottom end of the pressure relief channel 6, so that the intake has more ample buffer space, reducing the guidance of the inner wall of the pressure relief chamber 4 on the intake of the pressure relief channel 6, and ensuring the stability of the intake.

[0040] The pressure relief channels 6 are a plurality of channels evenly distributed around the pressure relief chamber 4, which can reduce the exhaust time, thereby reducing the time required for switching, thereby improving the overall performance of the pneumatic sprayer motor, especially the stability is greatly improved; Figure 3 As shown, in the present scheme, the pressure relief channels 6 are three evenly distributed around the pressure relief chamber 4, and the pressure relief channels 6 are perpendicular to the vertical direction, so as to break up the intake air beam as much as possible, reduce the gas flow rate entering the pressure stabilizing chamber, ensure the intake stability, reduce the influence of the intake angle on the intake flow rate, and ensure the use stability of the pneumatic sprayer motor under the preset parameters.

[0041] In this embodiment, the sealing gasket 9 is arranged at the working end of the valve core 7 through the elastic member 13, and the elastic member 13 has an elastic force that enables the sealing gasket 9 to block the pressure-maintaining channel 5 and the pressure-relief channel 6. Thus, the pressure-maintaining channel 5 and the pressure-relief channel 6 are in a normally closed state, improving the sealing performance of the structure in a non-working state and improving the reliability of the pilot valve. The elastic member 13 can be made of porous elastic rubber or a spring or a component or assembly with its own elastic force, which will not be described in detail here.

[0042] In this embodiment, the top of the pressure-maintaining chamber 3 is closed by an upper cover 14. More specifically, the upper cover 14 has an external thread, and the pilot valve body 1 has an internal thread that matches the external thread of the upper cover 14. The upper cover 14 is threadedly connected to the pilot valve body 1 to close the top of the pressure-maintaining chamber 3, wherein the upper cover 14 and the pilot valve body 1 are sealed by an O-ring 15, and the sealing gasket 9 is limited in the pressure-maintaining chamber 3 by an elastic member 13, and the elastic force direction of the elastic member 13 is parallel to the vertical direction;

[0043] More specifically, the bottom surface of the upper cover 14 is recessed upward to form a receiving groove 16, and the sealing gasket 9 is limited on the limiting seat 18 by the upper fastener 17, and the upper fastener 17 is disc-shaped and sleeved and fixed to the valve core 7, wherein the upper fastener 17 is fixed to the top of the valve core 7 by a threaded connection to form a whole, and the radial outer wall of the valve core 7 extends outward to form the limiting seat 18, and the limiting seat 18 is upwardly close to the working end, and the sealing gasket 9 is fastened between the bottom surface of the upper fastener 17 and the top surface of the limiting seat 18 in the vertical direction. The radial dimension of the limit seat 18 is smaller than the radial dimension of the pressure relief chamber 4, and the sealing gasket 9 is a disc-shaped rubber gasket, and the radial dimension of the sealing gasket 9 is between the radial dimension of the pressure relief chamber 4 and the radial dimension of the pressure holding chamber 3, so that the movement of the valve core 7 is stable and reliable, and the sealing gasket 9 can reliably seal the pressure relief chamber 4 and the pressure holding chamber 3; the radial outer edge of the upper fastener 17 protrudes downward to form a protective wall 19 covering the radial outer facade of the sealing gasket 9, further improving the reliability of the use of the sealing gasket 9 and improving the service life of the sealing gasket 9;

[0044] The top of the upper fastener 17 protrudes upward to form a guide column 20. The elastic member 13 is a spring sleeved on the guide column 20. The spring is built into the accommodating groove 16. The spring is vertically abutted against the bottom of the accommodating groove 16 and the top surface of the upper fastener 17. The inner diameter of the spring is roughly consistent with the outer diameter of the guide column 20. The outer diameter of the spring is roughly consistent with the inner diameter of the accommodating groove 16, which improves the reliability of the limit of the lifting spring through the inner wall of the accommodating groove 16 and the outer wall of the guide column 20, further ensures the axial stability of the movement of the valve core 7, ensures the consistency of the pressure at the connecting port of the pressure relief chamber 4 and the pressure holding chamber 3, and improves the structural reliability.

[0045] In this embodiment, Figure 4 As shown, a barrier ring 21 protruding from the bottom surface of the pressure-maintaining chamber 3 is formed on the shoulder of the stepped shaft-shaped air chamber, and the barrier ring 21 is in the shape of a circular ring connected end to end in the radial direction, and the barrier ring 21 is close to the inner wall surface of the pressure relief chamber 4; the sealing gasket 9 is engaged with or disconnected from the barrier ring 21 through the movement of the working end; more specifically, the sealing gasket 9 is engaged with the barrier ring 21 through the movement of the working end to block the pressure-maintaining chamber 3 and the pressure relief chamber 4, or the sealing gasket 9 is disconnected from the barrier ring 21 through the movement of the working end to connect the pressure-maintaining chamber 3 and the pressure relief chamber 4. The sealing gasket 9 seals the pressure-maintaining chamber 3 and the pressure relief chamber 4 through a point-to-surface seal, which is more reliable and has better sealing performance than the traditional pilot valve surface-to-surface seal. Even if the sealing gasket 9 is slightly damaged, its sealing performance will not be affected. The service life of the pilot valve is significantly improved, and the use of consumables is greatly reduced.

[0046] In this embodiment, the bottom end of the pressure relief chamber 4 is closed by the valve core 7; the bottom of the pilot valve body 1 protrudes downward to form a functional seat 22, and the functional seat 22 is inserted into the mounting hole reserved in the cylinder body, so that the driving end of the valve core 7 extends into the inner cavity of the cylinder 2 and is driven upward or downward by the piston that reciprocates in the cylinder 2; the sealing ring II12 is an O-ring, and the sealing ring II12 is fastened between the functional seat 22 and the mounting hole reserved in the cylinder 2, and the sealing ring II12 is located on the radial inner side of the bottom air port of the pressure-maintaining channel 5 to seal it;

[0047] The bottom of the functional seat 22 is recessed upward to form a functional cavity, and the sealing ring is limited in the functional cavity by the lower fastener 23; more specifically, the lower fastener 23 is disc-shaped and sleeved on the valve core 7, wherein the lower fastener 23 is fixed to the functional seat 22 by a threaded connection to form a whole, and the sealing ring is a star-shaped sealing ring 8, which is pressed between the bottom of the functional cavity and the top surface of the lower fastener 23, and the sealing ring forms a pre-tightening hold on the valve core 7. The star-shaped sealing ring 8 isolates the compressed gas inside the cylinder 2 from the pressure relief chamber 4, and at the same time can prevent external gas and impurities from entering the cylinder 2 through the pressure relief chamber 4, thereby improving the reliability of the structure.

[0048] In this embodiment, the lower fastener 23 has a guide channel for guiding the valve core 7, and the radial dimension of the guide channel is not less than the radial dimension of the valve core 7, and the radial dimension of the guide channel is substantially consistent with the radial dimension of the valve core 7, thereby further ensuring the stability of the operation of the valve core 7;

[0049] The valve core 7 is sequentially inserted through the lower fastener 23, the sealing ring and the pilot valve body 1 from bottom to top, the working end extends upward into the air chamber, and the driving end extends downward from the lower fastener 23. The lower fastener 23 can ensure the coaxiality of the up and down reciprocating motion of the valve core 7, thereby extending the service life of the star-shaped sealing ring 8, the sealing gasket 9 and the spring.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pilot valve assembly, characterized in that: The pilot valve body comprises a pilot valve body having an air chamber, wherein the air chamber comprises a pressure-maintaining chamber and a pressure-releasing chamber connected to each other; the pilot valve body also comprises a pressure-maintaining channel connected to the pressure-maintaining chamber and a pressure-releasing channel connected to the pressure-releasing chamber; It also includes a valve core, the valve core having a working end and a driving end, the valve core is vertically arranged in the pilot valve body from bottom to top, so that the working end is located inside the air chamber, the driving end is located outside the air chamber, and the working end is driven by the driving end to reciprocate in the air chamber in the vertical direction; It also includes a sealing ring disposed between the valve core and the pilot valve body, the sealing ring being used to seal a radial gap between the valve core and the pilot valve body; The working end is connected with a sealing gasket, and the sealing gasket connects or blocks the pressure-maintaining chamber and the pressure-releasing chamber through the movement of the working end.

2. The pilot valve assembly according to claim 1, characterized in that: The pressure-maintaining channel is opened in the pilot valve body obliquely inward from bottom to top, the bottom air port of the pressure-maintaining channel is located on the bottom surface of the pilot valve body, and the top air port of the pressure-maintaining channel is located on the radial inner wall of the pressure-maintaining chamber.

3. The pilot valve assembly according to claim 1, characterized in that: The pressure relief channels are a plurality of channels evenly distributed in the circumferential direction of the pressure relief chamber.

4. The pilot valve assembly according to claim 1, characterized in that: The bottom of the pilot valve body extends radially to form a valve seat, the bottom end of the pressure relief chamber is located in the valve seat, the pressure relief channel is opened at the valve seat and communicates with the pressure relief chamber, and the bottom end of the pressure relief chamber is located at the bottom of the bottom end of the pressure relief channel in the vertical direction.

5. The pilot valve assembly according to claim 1, characterized in that: The sealing pad is arranged at the working end of the valve core through an elastic member, and the elastic member has an elastic force that enables the sealing pad to block the pressure-maintaining channel and the pressure-releasing channel.

6. The pilot valve assembly according to claim 5, characterized in that: The air chamber penetrates the pilot valve body in the vertical direction, and the truncated shape of the air chamber in the vertical direction is a stepped shaft shape with a larger upper end and a smaller lower end; The large diameter section of the stepped shaft-shaped air chamber forms a pressure-maintaining chamber, and the small diameter section of the stepped shaft-shaped air chamber forms a pressure-releasing chamber; The top end of the pressure-maintaining chamber is closed by an upper cover, and the bottom end of the pressure-releasing chamber is closed by a valve core.

7. The pilot valve assembly according to claim 6, characterized in that: The sealing gasket is limited in the pressure-maintaining chamber by an elastic member, and the elastic force direction of the elastic member is parallel to the vertical direction; A barrier ring protruding from the bottom surface of the pressure-maintaining chamber is formed on the shoulder of the stepped shaft-shaped air chamber, and the barrier ring is in a ring shape connected end to end in a radial direction; The sealing gasket is engaged or disengaged with the barrier ring by movement of the working end.

8. The pilot valve assembly according to claim 7, characterized in that: The bottom surface of the upper cover is recessed upward to form a receiving groove, the radial outer wall of the valve core extends outward to form a limit seat, the limit seat is upward close to the working end, the sealing gasket is limited on the limit seat by the upper fastener, and the top of the upper fastener protrudes upward to form a guide column; The elastic member is a spring sleeved on the guide column, and the spring is supported on the bottom of the accommodating groove and the top surface of the upper fastener in the vertical direction.

9. The pilot valve assembly according to claim 1, characterized in that: The bottom of the pilot valve body protrudes downward to form a functional seat, and the bottom of the functional seat is recessed upward to form a functional cavity. The sealing ring is limited in the functional cavity by a lower fastener.

10. The pilot valve assembly according to claim 9, characterized in that: The lower fastener has a guide channel for guiding the valve core, the radial dimension of the guide channel is not less than the radial dimension of the valve core, and the radial dimension of the guide channel is substantially consistent with the radial dimension of the valve core; The valve core is sequentially inserted through the lower fastener, the sealing ring and the pilot valve body from bottom to top, the working end extends upward into the air chamber, and the driving end extends downward from the lower fastener.

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