Pneumatic control valve

Abstract

The pneumatic control valve comprises a valve body, a valve cover, a valve rod, a valve element, a sleeve and a pressing sleeve, the valve element is connected with the valve rod through a quick-release assembly, the quick-release assembly comprises a locking marble and a reset spring, a sliding cavity is formed in the side portion of the valve rod, the reset spring is arranged in the sliding cavity, the locking marble comprises a sliding portion and a locking portion, and the locking portion is arranged in the sliding cavity. The outer diameter of the sliding part is larger than that of the locking part, the sliding part is arranged in the sliding cavity in a sliding mode, the valve rod is further provided with a limiting structure used for limiting the sliding part in the sliding cavity, and the reset spring acts on the inner end of the sliding part to promote the locking part to stretch out of the sliding cavity. A butt joint protruding part is arranged at the upper end of the valve element, an inserting groove used for allowing the valve rod to be inserted is formed in the upper end of the butt joint protruding part, and a locking hole communicated with the inserting groove and used for allowing the locking part to be inserted is formed in the side portion of the butt joint protruding part. The valve element and the valve rod are convenient to disassemble and assemble, axial deviation cannot occur after the valve element is installed, the structural stability is good, and accurate adjustment of flow of the adjusting valve can be guaranteed.

Description

Technical Field

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

[0002] The regulating valve, also known as the control valve, is a device that uses power to change the flow of fluid in the process control system. At the same time, the regulating valve is also a control device in the combination instrument, and is an important device in the automatic control system of the production process. It is widely used in chemical, petroleum, metallurgy, electric power, textile and other industries.

[0003] Under long-term use conditions, the existing regulating valve will wear out the valve core inside the valve body, causing the seal between it and the valve body to deteriorate, and then a gap will be generated between the valve core and the valve body, causing the regulating valve to fail and unable to be used normally. Therefore, the valve core needs to be replaced regularly to ensure the normal use of the regulating valve. In order to facilitate the replacement of the valve core, the valve core and the valve stem are usually connected by threaded matching. However, this connection method has poor stability. During the axial movement of the valve core driven by the valve stem and under the scouring effect of the long-term medium, the valve core is prone to loosening, thereby changing the axial position of the valve core on the valve stem, resulting in poor regulation accuracy of the regulating valve. Therefore, it is necessary to improve this structure. Utility Model Content

[0004] The utility model aims to provide a pneumatic regulating valve, which is not only convenient for disassembly and assembly of the valve core and the valve stem, but also prevents axial deviation of the valve core after installation, has good structural stability, and can ensure accurate regulation of the flow of the regulating valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic regulating valve, comprising a valve body, a valve cover, a valve stem, a valve core, a sleeve and a pressing sleeve, wherein the valve body is provided with an inlet flow channel, a port and an outlet flow channel which are connected in sequence, the valve cover is mounted on the upper end of the valve body, a bracket is arranged on the upper end of the valve cover, a pneumatic actuator is mounted on the bracket, the valve cover penetrates the valve cover, and the outer end of the valve stem is linked to the output end of the pneumatic actuator, the inner end of the valve stem is linked to the valve core, the pressing sleeve and the sleeve are pressed from top to bottom by the valve cover at the position of the port corresponding to the inner wall of the valve body, the inner wall of the sleeve is tightly fitted with the outer wall of the valve core, and a plurality of adjustment windows are arranged on the sleeve; the valve core and the valve stem are connected by a quick-release assembly Connected together, the quick-release assembly includes a locking pin and a return spring, a sliding cavity is provided on the side of the valve stem in a direction perpendicular to the central axis, the return spring is arranged in the sliding cavity, the locking pin includes a sliding part and a locking part which are coaxially arranged, the outer diameter of the sliding part is larger than the outer diameter of the locking part, the sliding part is slidably arranged in the sliding cavity, and the valve stem is also provided with a limiting structure for limiting the sliding part in the sliding cavity, the return spring acts on the inner end of the sliding part to cause the locking part to extend out of the sliding cavity; a docking protrusion is provided at the upper end of the valve core, a slot is provided at the upper end of the docking protrusion for the valve stem to be inserted, and a locking hole which is connected to the slot and for the locking part to be inserted is provided on the side of the docking protrusion.

[0006] By adopting the above technical solution, when installing the valve stem and the valve core, it is only necessary to first press the locking pin into the sliding cavity of the valve stem, and then insert the lower end of the valve stem into the slot of the docking protrusion of the valve core. After the locking hole of the docking protrusion is aligned with the sliding cavity, the locking pin is pushed outward by the spring force of the reset spring, so that the locking part of the locking pin extends into the locking hole of the docking protrusion, thereby realizing the linkage connection between the valve core and the valve stem; when disassembling, it is only necessary to push the locking pin inward and disengage from the locking hole of the docking protrusion, and then pull the valve stem out of the slot of the docking protrusion to complete the separation of the valve stem and the valve core. This structure is not only convenient for the disassembly and assembly of the valve core and the valve stem, but also after the valve core is installed, there will be no axial deviation, the structural stability is good, and the precise regulation of the flow of the regulating valve can be ensured.

[0007] The utility model is further configured as follows: the limiting structure includes a screw sleeve, a threaded section is provided at the lower end of the valve stem, the screw sleeve is threadedly connected to the threaded section, the sliding cavity is arranged on the side of the threaded section, a guide through hole is opened on the side of the screw sleeve, the inner diameter of the guide through hole is equivalent to the outer diameter of the locking part, and when the screw sleeve is tightened on the threaded section, the guide through hole is coaxial with the sliding cavity.

[0008] By adopting the above technical solution, the sleeve is threadedly connected to the threaded section of the valve stem, and a guide hole is opened on the sleeve. The inner diameter of the guide hole is smaller than the inner diameter of the sliding cavity to form a travel limit for the sliding part of the locking pin. This limit structure is not only convenient for disassembly and assembly itself, but also facilitates the disassembly and assembly of the locking pin and the return spring.

[0009] The utility model is further configured that a guide groove is provided on the upper edge of the inner wall of the docking protrusion, and the guide groove extends from the upper end of the docking protrusion to the locking hole.

[0010] By adopting the above technical solution and providing a guide groove, when the valve stem is connected to the valve core, the locking pin can be slidably guided so that it can slide accurately into the locking hole, which is beneficial to the early assembly operation.

[0011] The utility model is further configured that a guide flare is provided at a position of the butt protrusion corresponding to the upper end of the guide groove, and the outer end of the locking portion is in a dome shape.

[0012] The adoption of the technical solution is conducive to the locking pin sliding into the guide groove.

[0013] The utility model is further configured such that the locking pin is provided with a first pressure-stabilizing hole along the axial direction, and the valve core is provided with a second pressure-stabilizing hole at a position corresponding to the inner end of the slot.

[0014] By adopting the above technical solution, the first pressure-stabilizing hole can ensure the smooth axial sliding of the locking pin, and the second pressure-stabilizing hole can ensure that the valve stem can be smoothly inserted into the slot of the docking protrusion.

[0015] The utility model is further configured that the valve core is provided with a plurality of third pressure-stabilizing holes communicating with the upper and lower ends.

[0016] By adopting the above technical solution, the third pressure-stabilizing hole can ensure the pressure balance in the space above and below the valve core, ensuring that it can move up and down smoothly.

[0017] The utility model is further configured that a limit step is provided on the inner side of the sleeve at a position below the regulating window, and when the valve core abuts against the limit step, the regulating valve is completely closed, and a plurality of pressure relief holes are provided inside and outside the valve core at a position between the regulating window and the limit step.

[0018] By adopting the above technical solution, a pressure relief hole is set on the valve core. When the valve is opened, the pressure relief hole releases pressure first, which can avoid the high-pressure medium impacting the inner wall of the valve body due to opening too quickly and causing damage to the valve, while reducing the generation of noise.

[0019] The utility model is further configured as follows: a sealing groove is provided at the lower end of the pressing sleeve, a first sealing ring and a second sealing ring are embedded in the sealing groove, the cross-sections of the first sealing ring and the second sealing ring are both right-angled trapezoidal shapes, and a sealing protrusion is provided at the upper end of the sleeve for pressing the first sealing ring and the second sealing ring in the sealing groove; sealing gaskets are clamped between the valve cover and the valve body, between the valve cover and the pressing sleeve, and between the sleeve and the inner wall of the valve body.

[0020] By adopting the above technical solution, the sealing between the valve cover and the pressing sleeve, between the pressing sleeve and the sleeve, and between the sleeve and the inner wall of the valve body can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the valve stem and valve core of the utility model;

[0023] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0024] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0025] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. valve core; 5. sleeve; 6. pressing sleeve; 7. inlet flow channel; 8. through port; 9. outlet flow channel; 10. bracket; 11. pneumatic actuator; 12. adjustment window; 13. quick release assembly; 14. locking pin; 15. reset spring; 16. sliding cavity; 17. sliding part; 18. locking part; 19. limiting structure; 20. docking protrusion; 21. slot; 22. locking hole; 23. screw sleeve; 24. threaded section; 25. guide through hole; 26. guide groove; 27. guide expansion; 28. first pressure-stabilizing hole; 29. ​​second pressure-stabilizing hole; 30. third pressure-stabilizing hole; 31. limiting step; 32. pressure relief hole; 33. sealing groove; 34. first sealing ring; 35. second sealing ring; 36. sealing protrusion; 37. sealing gasket. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example: As attached Figures 1 to 4A pneumatic regulating valve shown in the figure comprises a valve body 1, a valve cover 2, a valve stem 3, a valve core 4, a sleeve 5 and a pressing sleeve 6, wherein the valve body 1 is provided with an inlet flow channel 7, a port 8 and an outlet flow channel 9 which are connected in sequence, the valve cover 2 is mounted on the upper end of the valve body 1, a bracket 10 is arranged on the upper end of the valve cover 2, a pneumatic actuator 11 is mounted on the bracket 10, the valve cover 2 penetrates the valve cover 2, and the outer end of the valve stem 3 is linked to the output end of the pneumatic actuator 11, the inner end of the valve stem 3 is linked to the valve core 4, the pressing sleeve 6 and the sleeve 5 are pressed from top to bottom by the valve cover 2 at the position of the port 8 on the inner wall of the valve body 1, the inner wall of the sleeve 5 is tightly fitted with the outer wall of the valve core 4, and a plurality of adjustment windows 12 are arranged on the sleeve 5; the valve core 4 and the valve stem 3 are connected together by a quick release assembly 13, the quick release assembly 13 comprises a locking pin 14 and a return spring 15, and the valve stem 3 side The valve stem 3 is provided with a sliding cavity 16 in a direction perpendicular to the central axis, and the sliding cavity 16 is a cylindrical cavity. The reset spring 15 is arranged in the sliding cavity 16. The locking pin 14 includes a sliding portion 17 and a locking portion 18 which are coaxially arranged. The outer diameter of the sliding portion 17 is larger than the outer diameter of the locking portion 18. The sliding portion 17 is slidably arranged in the sliding cavity 16. The valve stem 3 is also provided with a limiting structure 19 for limiting the sliding portion 17 in the sliding cavity 16. The reset spring 15 acts on the inner end of the sliding portion 17 to cause the locking portion 18 to extend out of the sliding cavity 16. The upper end of the valve core 4 is provided with a docking protrusion 20, and the upper end of the docking protrusion 20 is provided with a slot 21 for inserting the valve stem 3, and the side of the docking protrusion 20 is provided with a locking hole 22 which is connected with the slot 21 and for inserting the locking portion 18, and the inner diameter of the locking hole 22 is equivalent to the outer diameter of the locking portion 18. When installing the valve stem 3 and the valve core 4, it is only necessary to first press the locking pin 14 into the sliding cavity 16 of the valve stem 3, and then insert the lower end of the valve stem 3 into the slot 21 of the docking protrusion 20 of the valve core 4. After the locking hole 22 of the docking protrusion 20 is aligned with the sliding cavity 16, the locking pin 14 is pushed outward by the spring force of the return spring 15, so that the locking part 18 of the locking pin 14 extends into the locking hole 22 of the docking protrusion 20, thereby realizing the linkage connection between the valve core 4 and the valve stem 3; when disassembling, it is only necessary to push the locking pin 14 inward and disengage the locking hole 22 of the docking protrusion 20, and then pull the valve stem 3 out of the slot 21 of the docking protrusion 20 to complete the separation of the valve stem 3 and the valve core 4. This structure is not only convenient for the disassembly and assembly of the valve core 4 and the valve stem 3, but also after the valve core 4 is installed, there will be no axial deviation, the structural stability is good, and the precise regulation of the flow of the regulating valve can be ensured.

[0028] As attached Figure 2As shown, the limiting structure 19 includes a screw sleeve 23, a threaded section 24 is provided at the lower end of the valve stem 3, the screw sleeve 23 is threadedly connected to the threaded section 24, specifically, the inner circumference of the screw sleeve 23 is provided with an internal thread, and the outer circumference of the threaded section 24 is provided with an external thread matching the internal thread, the sliding chamber 16 is provided on the side of the threaded section 24, and a guide through hole 25 is provided on the side of the screw sleeve 23, the inner diameter of the guide through hole 25 is equivalent to the outer diameter of the locking portion 18, when the screw sleeve 23 is tightened on the threaded section 24, the guide through hole 25 is coaxial with the sliding chamber 16. The screw sleeve 23 is threadedly connected to the threaded section 24 of the valve stem 3, and a guide through hole 25 is provided on the screw sleeve 23, the inner diameter of the guide through hole 25 is smaller than the inner diameter of the sliding chamber 16 to form a travel limit for the sliding portion 17 of the locking pin 14, and the limiting structure 19 is not only convenient for disassembly and assembly itself, but also conducive to the disassembly and assembly of the locking pin 14 and the reset spring 15.

[0029] As attached Figure 2 As shown, a guide groove 26 is provided on the inner wall of the docking protrusion 20, and the guide groove 26 extends from the upper end of the docking protrusion 20 to the locking hole 22. By providing the guide groove 26, when the valve stem 3 is connected to the valve core 4, the locking pin 14 can be slidably guided so that it can slide accurately into the locking hole 22, which is beneficial to the early assembly operation.

[0030] As attached Figure 2 As shown, the position of the butt protrusion 20 corresponding to the upper end of the guide groove 26 is provided with a guide flare 27, i.e. a conical surface with a larger outer surface and a smaller inner surface, and the outer end of the locking portion 18 is in a dome shape. This design facilitates the locking pin 14 to slide into the guide groove 26.

[0031] As attached Figure 2 As shown, the locking pin 14 is provided with a first pressure-stabilizing hole 28 in the axial direction, and the valve core 4 is provided with a second pressure-stabilizing hole 29 at the position corresponding to the inner end of the slot 21. The first pressure-stabilizing hole 28 can ensure that the locking pin 14 can slide smoothly in the axial direction, and the second pressure-stabilizing hole 29 can ensure that the valve stem 3 can be smoothly inserted into the slot 21 of the docking protrusion 20.

[0032] As attached Figure 2 As shown, the valve core 4 is provided with a plurality of third pressure-stabilizing holes 30 communicating with the upper and lower ends. The third pressure-stabilizing holes 30 can ensure the pressure balance of the space above and below the valve core 4, and ensure that it can move up and down smoothly.

[0033] As attached Figure 1 and attached Figure 3As shown, a position below the regulating window 12 is provided with a limit step 31 on the inner side of the sleeve 5. When the valve core 4 abuts against the limit step 31, the regulating valve is completely closed. The valve core 4 is provided with a plurality of pressure relief holes 32 in and out of the position between the regulating window 12 and the limit step 31. The pressure relief holes 32 are provided on the valve core 4. When the valve is opened, the pressure relief holes 32 are released first, which can avoid damage to the valve caused by the high-pressure medium impacting the inner wall of the valve body 1 due to too fast opening, and reduce the generation of noise.

[0034] As attached Figure 1 and attached Figure 4 As shown, the lower end of the pressing sleeve 6 is provided with a sealing groove 33, and the sealing groove 33 is embedded with a first sealing ring 34 and a second sealing ring 35. The cross-sections of the first sealing ring 34 and the second sealing ring 35 are both right-angled trapezoidal shapes, and the combination of the two forms a structure with a rectangular cross-section, and the upper end of the sleeve 5 is provided with a sealing protrusion 36 for pressing the first sealing ring 34 and the second sealing ring 35 in the sealing groove 33; a sealing gasket 37 is sandwiched between the valve cover 2 and the valve body 1, between the valve cover 2 and the pressing sleeve 6, and between the sleeve 5 and the inner wall of the valve body 1. This design can ensure the sealing between the valve cover 2 and the pressing sleeve 6, between the pressing sleeve 6 and the sleeve 5, and between the sleeve 5 and the inner wall of the valve body 1.

Claims

1. A pneumatic regulating valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve core (4), a sleeve (5) and a compression sleeve (6), wherein the valve body (1) is provided with an inlet flow channel (7), a port (8) and an outlet flow channel (9) which are connected in sequence, the valve cover (2) is mounted on the upper end of the valve body (1), a bracket (10) is arranged on the upper end of the valve cover (2), a pneumatic actuator (11) is mounted on the bracket (10), and the valve cover (2) is provided with a pneumatic actuator (11) The valve cover (2) is passed through, and the outer end of the valve stem (3) is linked to the output end of the pneumatic actuator (11), the inner end of the valve stem (3) is linked to the valve core (4), the pressing sleeve (6) and the sleeve (5) are pressed from top to bottom by the valve cover (2) on the inner wall of the valve body (1) corresponding to the position of the port (8), the inner wall of the sleeve (5) is tightly fitted with the outer wall of the valve core (4), and a plurality of adjustment windows (12) are provided on the sleeve (5); the characteristics are: The valve core (4) and the valve stem (3) are connected together through a quick-release assembly (13). The quick-release assembly (13) includes a locking pin (14) and a return spring (15). A sliding cavity (16) is provided on the side of the valve stem (3) in a direction perpendicular to the central axis. The return spring (15) is arranged in the sliding cavity (16). The locking pin (14) includes a coaxially arranged sliding portion (17) and a locking portion (18). The outer diameter of the sliding portion (17) is larger than the outer diameter of the locking portion (18). The sliding portion (17) is slidably arranged in the sliding cavity (16). The valve stem (3) is also provided with a limiting structure (19) for limiting the sliding portion (17) in the sliding cavity (16), and the return spring (15) acts on the inner end of the sliding portion (17) to cause the locking portion (18) to extend out of the sliding cavity (16); the upper end of the valve core (4) is provided with a docking protrusion (20), and the upper end of the docking protrusion (20) is provided with a slot (21) for inserting the valve stem (3), and the side of the docking protrusion (20) is provided with a locking hole (22) that is connected to the slot (21) and for inserting the locking portion (18).

2. A pneumatic regulating valve according to claim 1, characterized in that: The limiting structure (19) includes a screw sleeve (23), a threaded section (24) is provided at the lower end of the valve stem (3), the screw sleeve (23) is threadedly connected to the threaded section (24), the sliding cavity (16) is arranged on the side of the threaded section (24), and a guide hole (25) is opened on the side of the screw sleeve (23), the inner diameter of the guide hole (25) is equivalent to the outer diameter of the locking portion (18), when the screw sleeve (23) is tightened on the threaded section (24), the guide hole (25) is coaxial with the sliding cavity (16).

3. The pneumatic regulating valve according to claim 1, characterized in that: A guide groove (26) is provided on the inner wall upper edge of the docking protrusion (20), and the guide groove (26) extends from the upper end of the docking protrusion (20) to the locking hole (22).

4. A pneumatic regulating valve according to claim 3, characterized in that: The docking protrusion (20) is provided with a guide expansion opening (27) at a position corresponding to the upper end of the guide groove (26), and the outer end of the locking portion (18) is in a dome shape.

5. The pneumatic regulating valve according to claim 1, characterized in that: The locking pin (14) is provided with a first pressure-stabilizing hole (28) extending axially therethrough, and the valve core (4) is provided with a second pressure-stabilizing hole (29) extending therethrough at a position corresponding to the inner end of the slot (21).

6. The pneumatic regulating valve according to claim 1, characterized in that: The valve core (4) is provided with a plurality of third pressure-stabilizing holes (30) communicating with the upper and lower ends.

7. The pneumatic regulating valve according to claim 1, characterized in that: A limiting step (31) is provided on the inner side of the sleeve (5) at a position below the regulating window (12); when the valve core (4) abuts against the limiting step (31), the regulating valve is completely closed; and a plurality of pressure relief holes (32) are provided on the valve core (4) at a position between the regulating window (12) and the limiting step (31) and extending through the valve core (4).

8. The pneumatic regulating valve according to claim 1, characterized in that: The lower end of the pressing sleeve (6) is provided with a sealing groove (33), in which a first sealing ring (34) and a second sealing ring (35) are embedded, and the cross-sections of the first sealing ring (34) and the second sealing ring (35) are both in the shape of a right-angled trapezoid, and the upper end of the sleeve (5) is provided with a sealing protrusion (36) for pressing the first sealing ring (34) and the second sealing ring (35) into the sealing groove (33); sealing gaskets (37) are sandwiched between the valve cover (2) and the valve body (1), between the valve cover (2) and the pressing sleeve (6), and between the sleeve (5) and the inner wall of the valve body (1).

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