Pneumatic high-precision three-way regulating valve

Abstract

The pneumatic high-precision three-way regulating valve comprises a pneumatic actuator, a valve cover, a valve body, a valve rod and two valve seats, an inlet flow channel and two outlet flow channels are arranged in the valve body, an overflowing opening is formed between the inlet flow channel and each outlet flow channel, the two valve seats are installed on the corresponding overflowing openings respectively, and the two valve seats are arranged on the valve rod. The valve cover is installed at the upper end of the valve body, the valve rod is arranged on the valve cover in a penetrating mode, the outer end of the valve rod is connected with the output end of the pneumatic actuator, and valve elements used for being matched with the two valve seats respectively are arranged at the inner end of the valve rod. A floating sealing mechanism is arranged on the valve element and comprises a sealing ring and an elastic compensation assembly, an annular guide groove extending in the axial direction is formed in the periphery of the valve element, and when the valve element is matched with the corresponding valve seat in a sealing mode, the sealing ring is pressed on the corresponding valve seat through the corresponding elastic compensation assembly. The sealing part of the valve core adopts a floating type detachable structure, so that the sealing performance is better, the service life is longer, and the maintenance cost is lower.

Description

Technical Field

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

[0002] A pneumatic three-way regulating valve is an industrial valve that uses a pneumatic actuator to control the flow direction, volume, or pressure of media in a pipeline. It is suitable for fluid diversion (one inlet, two outlets) or merging (two inlets, one outlet). Its core function is to achieve precise proportioning, temperature mixing, or flow direction switching of multiple fluids. It is widely used in the chemical, energy, and pharmaceutical industries.

[0003] The Chinese utility model patent with application number CN202321921871.8 discloses a pneumatic three-way regulating valve including a pneumatic actuator, a valve body, a valve stem and a valve cover connected to the valve body. A valve core is provided in the valve body, one end of the valve stem is connected to the pneumatic actuator and the other end passes through the valve cover and extends into the interior of the valve body to be connected to the valve core. Two valve seats adapted to the valve core are provided in the valve body. The two valve seats have the same structure and are symmetrically arranged on the upper and lower sides of the valve core. The interior of the valve body is divided into three channels by the valve core cooperating with the two valve seats respectively. A plurality of grooves are provided on the valve seat, and a plurality of protrusions corresponding to the grooves are provided on the valve body. The valve seat is connected to the valve body through the protrusions cooperating with the grooves.

[0004] During actual use of the above structure, since the stroke of the pneumatic actuator is certain, the sealing surface of the valve core and the valve seat will be worn to a certain extent after frequent cooperation, which can easily deteriorate the sealing performance and cause leakage, resulting in a short service life. The valve core and the valve stem are usually welded together. Therefore, the entire valve stem with the valve core needs to be replaced together, which results in high maintenance costs.

[0005] Therefore, it is necessary to improve the existing pneumatic high-precision three-way regulating valve. Utility Model Content

[0006] The purpose of the utility model is to provide a pneumatic high-precision three-way regulating valve. The valve core sealing part of the utility model adopts a floating detachable structure, which not only has better sealing performance and longer service life, but also greatly reduces subsequent maintenance costs.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a pneumatic high-precision three-way regulating valve, comprising a pneumatic actuator, a valve cover, a valve body, a valve stem, and two valve seats, wherein the valve body is provided with an inlet flow channel and two outlet flow channels, a flow port is respectively provided between the inlet flow channel and each outlet flow channel, and the two valve seats are respectively mounted on the corresponding flow ports, the valve cover is mounted on the upper end of the valve body, the valve stem is provided through the valve cover, and the outer end of the valve stem is connected to the output end of the pneumatic actuator, and the inner end of the valve stem is provided with a valve core for respectively cooperating with the two valve seats; the valve core is provided with a floating sealing mechanism, which includes a sealing ring and an elastic compensation component, an annular guide groove extending in the axial direction is provided on the outer periphery of the valve core, and the end of the annular guide groove adjacent to the corresponding valve seat serves as a limit end, and the sealing ring is axially slidably disposed in the annular guide groove under the action of the elastic compensation component, and when the valve core is in sealing engagement with the corresponding valve seat, the sealing ring is pressed against the corresponding valve seat by the corresponding elastic compensation component.

[0008] By adopting the above technical solution, the sealing ring adopts a detachable floating structure. Even if the sealing surface of the sealing ring is worn, resulting in a larger gap between it and the corresponding valve seat when the gap between the two becomes larger, the gap can be compensated by the elastic compensation component, so that the sealing ring is pressed against the valve seat under the action of elastic force, thereby achieving a reliable seal between the two and greatly increasing the service life of the regulating valve. When the sealing ring needs to be replaced, it is only necessary to remove the elastic compensation component first, and then the sealing ring can be removed and replaced, without replacing the entire valve stem and valve core, which greatly reduces the subsequent maintenance costs.

[0009] The utility model is further configured as follows: the elastic compensation component includes a limit ring and multiple springs, the limit ring is installed on the valve core at a position corresponding to the annular guide groove away from one end of the valve seat, the end of the valve core close to the limit ring is provided with multiple positioning grooves corresponding to the number of the springs, one end of the spring is embedded in the corresponding positioning groove, and the other end of the spring is in contact with the limit ring.

[0010] By adopting the above technical solution, multiple springs are used to perform elastic compensation on the sealing ring, the structure is simple and reliable, and the production cost is lower.

[0011] The present invention is further configured such that the elastic compensation component further includes a washer, and the washer is arranged between the limiting ring and the spring.

[0012] By adopting the above technical solution, the limit ring is separated from the spring by the washer, and the spring can be protected when the limit ring is installed to avoid damage to the spring.

[0013] The utility model is further configured such that an O-ring is installed on the inner circular surface of the sealing ring for forming a sealing fit with the circumferential surface of the annular guide groove.

[0014] By adopting the above technical solution, the sealing between the sealing ring and the valve core can be ensured, and the medium can be prevented from leaking from the gap between the sealing ring and the valve core when the valve core is matched with the corresponding valve seat.

[0015] The utility model is further configured such that the outer circumferential surface of the sealing ring is provided with a conical sealing surface for forming a sealing fit with the valve seat when the sealing surface abuts against the valve seat.

[0016] By adopting the above technical solution and using a conical sealing structure, the sealing performance of the sealing ring and the valve seat when they abut against each other can be improved.

[0017] The utility model is further configured such that a thread groove is provided at one end of the valve core corresponding to the annular guide groove away from the valve seat, and the limiting ring is threadedly connected to the thread groove.

[0018] By adopting the above technical solution, which is the first installation method of the limit ring, the connection structure is simple and reliable, and the disassembly and assembly are very convenient.

[0019] The utility model is further configured as follows: an annular mounting groove is provided at one end of the valve core corresponding to the annular guide groove away from the valve seat, the limiting ring is arranged in the annular mounting groove, and a plurality of locking blocks are provided on the inner circumference of the limiting ring, and a plurality of card grooves for the locking blocks to be clamped into are provided on the circumferential surface of the annular mounting groove, the card groove includes inlet and outlet grooves extending axially from one end of the valve core away from the corresponding valve seat and a locking groove extending circumferentially from the inner end of the inlet and outlet grooves along the circumferential surface of the annular mounting groove, and the locking groove includes a closing portion with a gradually decreasing height for guiding the locking block and a locking portion located at the inner end of the closing portion for interference fit with the locking block.

[0020] By adopting the above technical solution, which is the second installation method of the limit ring, the installation of the limit ring can be completed with only "one push and one turn", which is also very convenient to operate.

[0021] The utility model is further configured as follows: the valve stem includes an upper shaft rod and a connecting rod, the outer end and the inner end of the valve core are respectively provided with a first positioning groove and a second positioning groove, the two ends of the connecting rod are respectively embedded in the first positioning grooves of the two valve cores and welded and fixed, the upper shaft rod is embedded in the second positioning groove located at the upper end valve core and welded and fixed, and the upper shaft rod and the connecting rod are coaxially arranged.

[0022] By adopting the above technical solution, not only is the connection operation convenient, but also the assembly accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0024] Figure 2 for Figure 1A schematic diagram of the enlarged structure of the middle part A;

[0025] Figure 3 This is a structural diagram of the valve core in Example 1;

[0026] Figure 4 This is an exploded view of the valve core of Example 1;

[0027] Figure 5 This is a schematic diagram of the overall structure of Example 2;

[0028] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of the middle part B;

[0029] Figure 7 This is a structural diagram of the valve core in Example 2;

[0030] Figure 8 This is an exploded view of the valve core of Example 2;

[0031] Figure 9 for Figure 8 Schematic diagram of the enlarged structure.

[0032] In the figure: 1. Pneumatic actuator; 2. Valve cover; 3. Valve body; 4. Valve stem; 5. Valve seat; 6. Inlet flow channel; 7. Outlet flow channel; 8. Flow port; 9. Valve core; 10. Floating sealing mechanism; 11. Sealing ring; 12. Elastic compensation component; 13. Annular guide groove; 14. Limit end; 15. Limiting ring; 16. Spring; 17. Positioning groove; 18. Gasket; 19. O-ring; 20. Conical sealing surface; 21. Threaded groove; 22. Annular mounting groove; 23. Locking block; 24. Slot; 25. Inlet and outlet grooves; 26. Locking groove; 27. Closing part; 28. Locking part; 29. ​​Upper shaft; 30. Connecting rod; 31. First positioning groove; 32. Second positioning groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1: As shown in the attached Figures 1 to 4The pneumatic high-precision three-way regulating valve shown in the figure includes a pneumatic actuator 1, a valve cover 2, a valve body 3, a valve stem 4 and two valve seats 5. The valve body 3 is provided with an inlet flow channel 6 and two outlet flow channels 7. A flow port 8 is provided between the inlet flow channel 6 and each outlet flow channel 7. The two valve seats 5 are respectively installed on the corresponding flow ports 8. More specifically, the valve seat 5 at the upper end can be threadedly connected to the upper flow port 8, and a sealing gasket is sandwiched between the two. The valve seat 5 at the lower end is pressed against the lower flow port 8 through the base, and the base is connected to the valve body 3 by bolts. Sealing gaskets are provided between the valve seat 5 and the valve body 3, and between the valve seat 5 and the base. The valve cover 2 is installed on the upper end of the valve body 3, the valve stem 4 is arranged on the valve cover 2, and the outer end of the valve stem 4 is connected to the output end of the pneumatic actuator 1. The inner end of the valve stem 4 is provided with a valve core 9 for cooperating with the two valve seats 5 respectively, and the valve core 9 is provided with a plurality of windows circumferentially When the medium passes through, the valve stem 4 moves upward to seal the upper valve core 9 with the upper valve seat 5, and the medium in the inlet flow channel 6 flows out from the lower outlet flow channel 7. When the valve stem 4 moves downward to seal the lower valve core 9 with the lower valve seat 5, the medium in the inlet flow channel 6 flows out from the upper outlet flow channel 7. A floating sealing mechanism 10 is provided on the valve core 9, and the floating sealing mechanism 10 includes a sealing ring 11 and an elastic compensation component 12. The sealing ring 11 can be made of metal. An annular guide groove 13 extending axially is provided on the outer periphery of the valve core 9. One end of the annular guide groove 13 close to the corresponding valve seat 5 serves as a limit end 14. The sealing ring 11 can be axially slidable in the annular guide groove 13 under the action of the elastic compensation component 12, that is, the elastic compensation component 12 applies a stable axial pre-tightening force to the sealing ring 11. When the valve core 9 is sealed with the corresponding valve seat 5, the sealing ring 11 is pressed against the corresponding valve seat 5 by the corresponding elastic compensation component 12. The sealing ring 11 adopts a detachable floating structure. Even if the sealing surface of the sealing ring 11 is worn, resulting in a larger gap between the two when it cooperates with the corresponding valve seat 5, the gap can be compensated by the elastic compensation component 12, so that the sealing ring 11 is pressed against the valve seat 5 under the action of elastic force, thereby achieving a reliable seal between the two and greatly increasing the service life of the regulating valve. When the sealing ring 11 needs to be replaced, it is only necessary to remove the elastic compensation component 12 first, and then the sealing ring 11 can be removed and replaced, without replacing the entire valve stem 4 and valve core 9, which greatly reduces the subsequent maintenance costs.

[0035] As attached Figures 2-4As shown, the elastic compensation assembly 12 includes a retaining ring 15 and multiple springs 16. The retaining ring 15 is installed on the valve core 9 at a position corresponding to the annular guide groove 13 at one end away from the valve seat 5. The end of the valve core 9 near the retaining ring 15 is provided with multiple positioning grooves 17, the number of which is equal to the number of the springs 16. One end of the spring 16 is embedded in the corresponding positioning groove 17, and the other end of the spring 16 abuts the retaining ring 15. The use of multiple springs 16 to elastically compensate the sealing ring 11 has a simple and reliable structure and lower production costs.

[0036] As attached Figures 2-4 As shown, the elastic compensation assembly 12 further includes a washer 18, which is made of metal and is disposed between the stop ring 15 and the spring 16. The washer 18 separates the stop ring 15 from the spring 16, and when the stop ring 15 is installed, the spring 16 can be protected from damage.

[0037] As attached Figures 2-4 As shown, the inner surface of the sealing ring 11 is mounted with an O-ring 19 for sealing engagement with the circumferential surface of the annular guide groove 13. Specifically, the inner surface of the sealing ring 11 has an annular groove within which the O-ring 19 is embedded. This design ensures a tight seal between the sealing ring 11 and the valve core 9, preventing leakage of the medium through the gap between the sealing ring 11 and the valve core 9 when the valve core 9 engages with the corresponding valve seat 5.

[0038] As attached Figures 2-4 As shown, the outer circumference of the sealing ring 11 is provided with a conical sealing surface 20 for forming a sealing fit when abutting against the valve seat 5. The conical sealing structure can improve the sealing performance of the sealing ring 11 and the valve seat 5 when they abut.

[0039] As attached Figures 2-4 As shown, the valve core 9 is provided with a threaded groove 21 at the end thereof corresponding to the annular guide groove 13 away from the valve seat 5. The retaining ring 15 is threadedly connected to the threaded groove 21. That is, the inner surface of the retaining ring 15 has an internal thread that mates with the threaded groove 21. This is the first installation method of the retaining ring 15, and the connection structure is simple and reliable, and it is very convenient to assemble and disassemble.

[0040] As attached Figure 1 As shown, the valve stem 4 includes an upper shaft 29 and a connecting rod 30. The outer and inner ends of the valve core 9 are respectively provided with a first positioning groove 31 and a second positioning groove 32. The first positioning groove 31 and the second positioning groove 32 are both circular grooves. The ends of the connecting rod 30 are respectively embedded in the first positioning grooves 31 of the two valve cores 9 and fixed by welding. The upper shaft 29 is embedded in the second positioning groove 32 of the upper valve core 9 and fixed by welding. The upper shaft 29 and the connecting rod 30 are coaxially arranged. This design not only facilitates the connection operation but also achieves high assembly precision.

[0041] Example 2: Different from the example, the installation method of the limit ring 15 in this example is different from that in the example.

[0042] As attached Figures 5 to 9 As shown, an annular mounting groove 22 is provided at the end of the valve core 9 corresponding to the annular guide groove 13 away from the valve seat 5. The limiting ring 15 is disposed in the annular mounting groove 22, and a plurality of locking blocks 23 are provided on the inner circumference of the limiting ring 15. The circumferential surface of the annular mounting groove 22 is provided with a plurality of slots 24 for receiving the locking blocks 23. The slots 24 include inlet and outlet slots 25 extending axially from the end of the valve core 9 away from the corresponding valve seat 5, and locking slots 26 extending circumferentially along the circumferential surface of the annular mounting groove 22 from the inner ends of the inlet and outlet slots 25. The locking slots 26 include a gradually decreasing height closing portion 27 for guiding the locking blocks 23, and a locking portion 28 at the inner end of the closing portion 27 for interference fit with the locking blocks 23. This is the second installation method of the limiting ring 15. The limiting ring 15 can be installed with just "one push and one turn", which is also very convenient to operate.

Claims

1. A pneumatic high-precision three-way regulating valve, comprising a pneumatic actuator (1), a valve cover (2), a valve body (3), a valve stem (4) and two valve seats (5), wherein the valve body (3) is provided with an inlet flow channel (6) and two outlet flow channels (7), a flow port (8) is provided between the inlet flow channel (6) and each outlet flow channel (7), and the two valve seats (5) are respectively mounted on the corresponding flow ports (8), the valve cover (2) is mounted on the upper end of the valve body (3), the valve stem (4) is provided through the valve cover (2), and the outer end of the valve stem (4) is connected to the output end of the pneumatic actuator (1), and the inner end of the valve stem (4) is provided with a valve core (9) for respectively cooperating with the two valve seats (5); characterized in that: The valve core (9) is provided with a floating sealing mechanism (10), and the floating sealing mechanism (10) includes a sealing ring (11) and an elastic compensation component (12). The outer periphery of the valve core (9) is provided with an annular guide groove (13) extending in the axial direction, and one end of the annular guide groove (13) close to the corresponding valve seat (5) serves as a limiting end (14). The sealing ring (11) can be axially slidably arranged in the annular guide groove (13) under the action of the elastic compensation component (12). When the valve core (9) is sealed with the corresponding valve seat (5), the sealing ring (11) is pressed against the corresponding valve seat (5) by the corresponding elastic compensation component (12).

2. The pneumatic high-precision three-way regulating valve according to claim 1 is characterized in that: The elastic compensation component (12) includes a limiting ring (15) and a plurality of springs (16). The limiting ring (15) is installed on the valve core (9) at a position corresponding to the annular guide groove (13) away from one end of the valve seat (5). The end of the valve core (9) close to the limiting ring (15) is provided with a plurality of positioning grooves (17) whose number is equivalent to the number of the springs (16). One end of the spring (16) is embedded in the corresponding positioning groove (17), and the other end of the spring (16) is in contact with the limiting ring (15).

3. The pneumatic high-precision three-way regulating valve according to claim 2 is characterized in that: The elastic compensation component (12) further includes a washer (18), and the washer (18) is arranged between the limiting ring (15) and the spring (16).

4. The pneumatic high-precision three-way regulating valve according to claim 2 is characterized in that: The inner circumferential surface of the sealing ring (11) is provided with an O-ring (19) for forming a sealing fit with the circumferential surface of the annular guide groove (13).

5. The pneumatic high-precision three-way regulating valve according to claim 2 is characterized in that: The outer circumferential surface of the sealing ring (11) is provided with a conical sealing surface (20) for forming a sealing fit with the valve seat (5) when abutting against the valve seat (5).

6. The pneumatic high-precision three-way regulating valve according to claim 2, characterized in that: A thread groove (21) is provided at one end of the valve core (9) corresponding to the annular guide groove (13) and away from the valve seat (5), and the limiting ring (15) is threadedly connected to the thread groove (21).

7. The pneumatic high-precision three-way regulating valve according to claim 2, characterized in that: An annular mounting groove (22) is provided at one end of the valve core (9) corresponding to the annular guide groove (13) away from the valve seat (5); the limiting ring (15) is provided in the annular mounting groove (22); and a plurality of locking blocks (23) are provided on the inner circumference of the limiting ring (15); a plurality of card grooves (24) for the locking blocks (23) to be clamped are provided on the circumferential surface of the annular mounting groove (22); the card groove (24) includes an inlet and outlet groove (25) extending axially from one end of the valve core (9) away from the corresponding valve seat (5) and a locking groove (26) extending circumferentially from the inner end of the inlet and outlet groove (25) along the circumferential surface of the annular mounting groove (22); and the locking groove (26) includes a closing portion (27) with a gradually decreasing height for guiding the locking block (23) and a locking portion (28) located at the inner end of the closing portion (27) for interference fit with the locking block (23).

8. The pneumatic high-precision three-way regulating valve according to claim 1 is characterized in that: The valve stem (4) includes an upper shaft rod (29) and a connecting rod (30), and the outer end and the inner end of the valve core (9) are respectively provided with a first positioning groove (31) and a second positioning groove (32), and the two ends of the connecting rod (30) are respectively embedded in the first positioning grooves (31) of the two valve cores (9) and welded and fixed, and the upper shaft rod (29) is embedded in the second positioning groove (32) located at the upper end of the valve core (9) and welded and fixed, and the upper shaft rod (29) and the connecting rod (30) are coaxially arranged.

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