A regulating valve

Abstract

The present invention belongs to the technical field of pipeline valves, and discloses a regulating valve, including a valve body, a valve sleeve, a rotating shaft, two hemispherical valve cores and a replacement rod; the valve body is provided with an inlet and an outlet, the valve sleeve is movably connected to the valve body, and one end is located between the inlet and the outlet inside the valve body as a sealing end; the rotating shaft is located at the sealing end and is rotatably connected to the valve sleeve in the horizontal direction, and one end of the rotating shaft extends out of the valve sleeve; the replacement rod is movably connected to the valve body, and one end extends into the interior of the valve body and can be connected to one end of the rotating shaft extending out of the valve sleeve to drive the rotating shaft to rotate relative to the valve sleeve; the two hemispherical valve cores are of the same shape and are respectively located on both sides of the rotating shaft and form a complete spherical body, which can rotate with the rotating shaft and reciprocate with the valve sleeve, wherein the hemispherical valve core located near the sealing end forms a contact seal with the sealing end, and the extended sealing end can form a contact seal with the valve body. The regulating valve of the present invention can perform online and simple rapid replacement of the valve core.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline valves, and in particular relates to a regulating valve. Background Art

[0002] A regulating valve is a device that controls the flow of fluid in a conveying pipeline. It is an executive unit in an industrial automation control system and an indispensable component in the regulation system. It is an important part of the industrial automation system and can be divided into two types according to its function: cut-off and regulation.

[0003] At present, when regulating valves are used to regulate the medium flow in the system, there are generally the following problems:

[0004] 1. When the regulating valve is regulating the flow of the medium, its valve core is eroded by the medium for a long time, which causes the valve core to be eroded and often damaged. In order to avoid the failure of the regulating valve, the regulating valve needs to be maintained frequently. When the valve core is damaged, the valve core needs to be replaced. However, to replace the valve core, the regulating valve needs to be removed from the pipeline, and then the regulating valve is disassembled, and the valve core is taken out for replacement. This replacement method is not only cumbersome and labor-intensive, but also requires stopping the system, which delays the system's working process;

[0005] 2. When the valve core of the regulating valve is replaced, the distance between the valve core and the valve seat cannot be guaranteed, so the regulating valve needs to be readjusted after the replacement. This process is troublesome, not only time-consuming, but also requires the staff to have certain experience;

[0006] 3. Currently, there are some control valves that can be repaired online. However, when performing online repair, the valve body does not need to be disassembled, but the pipelines on both sides of the control valve need to be closed. The control valve cannot work during the repair process, and true online repair cannot be achieved. There is still a problem of delaying the system working process. Summary of the invention

[0007] In view of the above problems, the present invention discloses a regulating valve to overcome the above problems or at least partially solve the above problems.

[0008] The regulating valve comprises a valve body, a valve sleeve, a rotating shaft, two hemispherical valve cores and a replacement rod; the valve body is provided with an inlet and an outlet, the valve sleeve is movably connected to the valve body, and one end of the valve sleeve is located between the inlet and the outlet inside the valve body as a sealing end; the rotating shaft is located at the sealing end and is rotatably connected to the valve sleeve in a horizontal direction, and one end of the rotating shaft extends out of the valve sleeve; the replacement rod is movably connected to the valve body, and one end of the replacement rod extends into the interior of the valve body and can be connected to one end of the rotating shaft extending out of the valve sleeve to drive the rotating shaft to rotate relative to the valve sleeve; the two hemispherical valve cores have the same shape and are respectively located on both sides of the rotating shaft and form a complete spherical body, which can rotate with the rotating shaft and reciprocate with the valve sleeve, wherein the hemispherical valve core located close to the sealing end forms a contact seal with the sealing end, and extends out of the sealing end to form a contact seal with the valve body.

[0009] Preferably, the sealing end of the valve sleeve adopts a closed-end design, and the part of the rotating shaft located at the valve sleeve is provided with two guide rods and two pre-tightening springs; the two guide rods are arranged on both sides of the rotating shaft along the axial direction of the valve sleeve, and respectively form a sliding connection with two hemispherical valve cores, and the pre-tightening springs are located between the guide rods and the hemispherical valve cores to drive the hemispherical valve cores to move in a direction away from the rotating shaft; a push rod is provided inside the valve sleeve, one end of the push rod is connected to the valve sleeve, and the other end forms a sliding abutment with the hemispherical valve core away from the sealing end, so that the hemispherical valve core moves in a direction close to the rotating shaft.

[0010] Preferably, the push rod is connected to the valve sleeve by threads.

[0011] Preferably, a magnet is provided at one end of the push rod in contact with the hemispherical valve core, and the hemispherical valve core is made of magnetic metal.

[0012] Preferably, the guide rod is a square rod, and the hemispherical valve core is provided with a square hole corresponding to the guide rod.

[0013] Preferably, the regulating valve further comprises a regulating rod, which is arranged along the axial direction of the valve sleeve, with one end connected to the valve body and the other end connected to the valve sleeve to drive the valve sleeve to perform reciprocating linear movement relative to the valve body.

[0014] Preferably, the adjusting rod is a screw rod; one end of the adjusting rod is in sliding connection with the valve body for relative rotation, and the other end is threadedly connected with the valve sleeve.

[0015] Preferably, a rotating wheel is provided at one end of the rotating shaft located outside the valve sleeve, and the replacement rod can be connected to the rotating wheel to drive the rotating wheel to rotate.

[0016] Preferably, a ratchet is provided on the rotating wheel, and a one-way push plate and a push plate spring are provided at the end of the changing rod; the one-way push plate is rotatably connected to the changing rod, and the push plate spring is located between the changing rod and the one-way push plate to drive the one-way push plate to rotate upward until it maintains a fixed position with the changing rod; when the changing rod moves downward, the push plate spring drives the one-way push plate to be located in a fixed position to form contact with the ratchet and drive the ratchet to rotate; when the changing rod moves upward, the one-way push plate overcomes the push plate spring to rotate and slides over the ratchet, and the ratchet remains fixed.

[0017] Preferably, the regulating valve is also provided with a spring sheet, the rotating wheel is also provided with a limiting section, and the outer circumferential surface of the limiting section is provided with a limiting straight edge; the spring sheet is arranged on the valve sleeve along the vertical direction and can be in contact with the limiting straight edge of the limiting section to limit the rotation of the rotating wheel.

[0018] The regulating valve of the present invention has the following beneficial technical effects:

[0019] 1. In the present invention, a valve sleeve is arranged inside the valve body, a rotating shaft and two hemispherical valve cores on the rotating shaft that can form a complete sphere are arranged inside the valve sleeve, and the rotating shaft is used to drive the two hemispherical valve cores to rotate and switch positions. The positions of the two hemispherical valve cores inside the valve sleeve can be switched while keeping the position of the valve sleeve in the valve body unchanged and the two hemispherical valve cores remaining in a complete sphere, thereby replacing the hemispherical valve core that controls the fluid channel inside the valve body, and realizing online replacement of the valve core without affecting the flow control or changing the flow, and the replacement operation is simple and fast.

[0020] 2. In the present invention, the hemispherical valve core at the sealing end of the valve sleeve is brought into contact and sealed with the valve sleeve, so that the position of the valve sleeve inside the valve body can be changed by using the adjusting rod between the valve body and the valve sleeve, thereby driving the hemispherical valve core to move synchronously to change the flow area of ​​the fluid channel between the inlet and the outlet, thereby realizing the regulation of the flow by the regulating valve.

[0021] 3. In the present invention, a square rod-shaped guide rod is arranged on the rotating shaft and a corresponding square hole is arranged on the hemispherical valve core, so that the hemispherical valve core can be prevented from rotating relative to the rotating shaft, which facilitates installation and avoids relative rotation around the guide rod between the hemispherical valve core and the valve sleeve, thereby improving the sealing effect and connection stability.

[0022] 4. In the present invention, a ratchet and a limit section are arranged at the end of the rotating shaft, a one-way push plate and a push half spring are arranged at the end of the changing rod, and a spring sheet is arranged at the limit section. Thus, by reciprocating the changing rod in the vertical direction, the ratchet can be driven to rotate in one direction, thereby driving the rotating shaft to realize the switching of the positions of the two hemispherical valve cores, thereby achieving a simple and fast replacement operation of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional structure diagram of the regulating valve of this embodiment;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure in the AA direction;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure in the middle BB direction;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure in the CC direction;

[0027] Figure 5 It is a schematic diagram of the structure of the valve sleeve in the regulating valve of this embodiment. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Combination Figures 1 to 5 As shown, the regulating valve in this embodiment includes a valve body 1 , a valve sleeve 2 , a rotating shaft 3 , a first hemispherical valve core 41 , a second hemispherical valve core 42 and a replacement rod 5 .

[0030] The valve body 1 adopts a split structure, consisting of a body and a valve cover, and an inlet 6 and an outlet 7 are provided in the body. The valve sleeve 2 forms a movable connection with the valve cover part of the valve body 1 that can slide relative to each other in the vertical direction, and the lower end of the valve sleeve 2 serves as a sealing end and is located between the inlet 6 and the outlet 7 inside the body of the valve body 1. The rotating shaft 3 is located at the sealing end and is rotatably connected with the valve sleeve 2 in the horizontal direction, and one end of the rotating shaft 3 extends out of the valve sleeve 2. The replacement rod 5 forms a movable connection with the valve body 1 that slides relative to each other in the vertical direction, and the lower end extends into the interior of the valve body 1 and can be connected with the end of the rotating shaft 3 that extends out of the valve sleeve 2 to drive the rotating shaft 3 to rotate relative to the valve sleeve 2. The first hemispherical valve core 41 and the second hemispherical valve core 42 have the same shape and are located on both sides of the rotating shaft 3 and form a complete spherical body, which can rotate inside the valve sleeve 2 with the rotation of the rotating shaft 3, and can reciprocate relative to the valve body 1 with the valve sleeve 2. The second hemispherical valve core 42 located near the sealing end forms a contact seal with the sealing end of the valve sleeve 2 through the sealing member 8, and the protruding sealing end can form a contact seal with the valve body 1 to cut off and control the flow area of ​​the fluid channel between the inlet 6 and the outlet 7.

[0031] Preferably, in this embodiment, the sealing end of the valve sleeve 2 adopts a closing design to form a supporting seal for the second hemispherical valve core 42. At the same time, the portion of the rotating shaft 3 located at the valve sleeve 2 is provided along a first guide rod 91 and a second guide rod 92. The two guide rods are arranged on both sides of the rotating shaft 3 along the axial direction of the valve sleeve 2, and respectively form a sliding connection with the two hemispherical valve cores, that is, the two hemispherical valve cores are respectively sleeved on the two guide rods. A first preload spring 101 is provided between the first guide rod 91 and the first hemispherical valve core 41, and a second preload spring 102 is provided between the second guide rod 92 and the second hemispherical valve core 42, wherein the second preload spring 102 can drive the second hemispherical valve core 42 to move in a direction away from the rotating shaft 3, that is, Figure 1 The valve sleeve 2 is shown to move downward, so that the second hemispherical valve core 42 is kept in a contact and sealing state with the sealing member 8. A push rod 11 is also provided inside the valve sleeve 2, the upper end of the push rod 11 is connected to the valve sleeve 2, and the lower end forms a sliding contact with the first hemispherical valve core 41, so that the first hemispherical valve core 41 overcomes the force of the first preload spring 101 and moves toward the direction close to the rotating shaft 3, so that the first hemispherical valve core 41 and the second hemispherical valve core 42 form a complete sphere.

[0032] Preferably, in this embodiment, a threaded connection is adopted between the push rod 11 and the valve sleeve 2. In this way, the push rod and the valve sleeve can be connected in a detachable manner, so as to facilitate the disassembly and assembly of the hemispherical valve core located above the rotating shaft.

[0033] Furthermore, in this embodiment, the lower end of the push rod 11 adopts an arc structure to increase the contact area with the first hemispherical valve core 41. A magnet 12 is provided at the lower end of the push rod 11, and both the first hemispherical valve core 41 and the second hemispherical valve core 42 are made of magnetic metal, such as an iron hemispherical valve core. At this time, by utilizing the magnetic adsorption force formed by the magnet on the first hemispherical valve core, the first hemispherical valve core can be easily removed from the valve sleeve and accurately placed in the valve sleeve, thereby improving the convenience of replacing the hemispherical valve core.

[0034] In addition, in this embodiment, the first guide rod 91 and the second guide rod 92 are both square rods, that is, rod-shaped structures with square cross sections, and corresponding square holes are also respectively provided in the first hemispherical valve core 41 and the second hemispherical valve core 42. In this way, by utilizing the sliding fit between the square rod and the square hole, it is possible to prevent the hemispherical valve core from rotating around the guide rod, that is, to prevent the second hemispherical valve core from rotating relative to the sealing member and the valve body, thereby improving the contact sealing effect between the hemispherical valve core and the valve body and the sealing effect between the hemispherical valve core and the valve sleeve.

[0035] Combination Figure 1 As shown, in the regulating valve of this embodiment, an adjusting rod 13 is further provided. The adjusting rod 13 is arranged along the axial direction of the valve sleeve 2, one end of which is connected to the valve body 1, and the other end is connected to the valve sleeve 2, so as to drive the valve sleeve 2 to move back and forth linearly relative to the valve body 1. In this way, the second hemispherical valve core can be driven by the valve sleeve to move back and forth inside the valve body to change the blocking of the passage between the inlet and the outlet by the second hemispherical valve core, so as to achieve the flow regulation of the medium flowing through the regulating valve.

[0036] Preferably, in this embodiment, the adjusting rod is a screw rod, and the lower end of the adjusting rod forms a sliding connection with the valve body that can rotate relatively, and the upper end forms a threaded connection with the valve sleeve. In this way, by reciprocating the adjusting rod, the reciprocating movement of the valve sleeve relative to the valve body can be adjusted, and the flow rate can be accurately adjusted.

[0037] Combination Figure 1 and Figure 3 As shown, in the present embodiment, a rotating wheel 14 is provided at one end of the rotating shaft 3 located outside the valve sleeve 2, and the lower end of the replacement rod 5 extends into the interior of the valve body 1 and can be connected with the rotating wheel 14 to drive the rotating wheel 14 to rotate, thereby driving the rotating shaft 3 to rotate, and then the first hemispherical valve core 41 and the second hemispherical valve core 42 rotate with the rotating shaft 3 inside the valve sleeve 2 to switch positions, that is, the first hemispherical valve core 41 is switched to form a contact seal with the sealing element 8 at the sealing end, and the second hemispherical valve core 42 is rotated to a position in contact with the push rod 11, and then the replaced second hemispherical valve core 42 can be removed through the push rod 11 without affecting the normal operation of the first hemispherical valve core 41, thereby completing the online replacement of the valve core of the regulating valve.

[0038] In this embodiment, a ratchet 141 is provided at one end of the rotating wheel 14, and a one-way push plate 15 and a push plate spring 16 are provided at the lower end of the changing rod 5. The one-way push plate 15 is rotatably connected to the changing rod 5, and the push plate spring 16 is located between the changing rod 5 and the one-way push plate 15 to drive the one-way push plate 15 to rotate upward to maintain a fixed position with the changing rod 5, that is, Figure 3 Position shown.

[0039] At this time, when the changing rod 5 moves downward, the push plate spring 16 drives the one-way push plate 15 to be located in a fixed position, so as to form contact with the ratchet 141 and drive the ratchet 141 to rotate, thereby driving the rotating shaft 3 to rotate; when the changing rod 5 moves upward, the one-way push plate 15 forms contact with the ratchet 141 and overcomes the force of the push plate spring 16 to rotate, thereby sliding over the ratchet 141 and keeping the ratchet 141 fixed, so that by reciprocating the changing rod 5 in the vertical direction, the one-way rotation of the rotating shaft 3 can be realized, thereby realizing the position switching of the two hemispherical valve cores.

[0040] Further, combined with Figure 4 As shown, in the regulating valve of this embodiment, two spring sheets 17 are also provided, and a limiting section 142 is provided at the other end of the rotating wheel 14. Four limiting straight edges are provided along the circumferential direction on the outer circumferential surface of the limiting section 142, that is, the limiting section 142 is a square structure. The two spring sheets 17 are arranged on the valve sleeve 2 in the vertical direction and can form a close contact with the two opposite limiting straight edges in the limiting section 142. At this time, the contact and cooperation between the spring sheets and the limiting sections can form a rotation restriction on the rotating wheel. In this way, when the replacement rod moves downward, the one-way push plate drives the ratchet to drive the limiting section to overcome the spring sheet to realize the rotation of the rotating shaft. When the replacement rod moves upward, the one-way push plate compresses the rotation of the push plate spring and the spring sheet and the limiting straight edge in the limiting section are in close contact, so that the ratchet can be kept in a static state, thereby further ensuring the one-way rotation control of the rotating shaft by the replacement rod.

[0041] In addition, combined Figure 1 and Figure 3 As shown, a replacement spring 18 is also provided between the replacement rod 5 and the valve body 1 to drive the replacement rod 5 to move upward. In this way, the replacement spring can form an upward driving force for the replacement rod, increase the speed of the replacement rod moving upward and resetting, and improve the efficiency of replacing the valve core.

[0042] Among them, in this embodiment, the rotating wheel adopts a combination structure of a ratchet wheel with four ratchet teeth evenly distributed and a limiting segment with four limiting straight edges evenly distributed, so that the replacement rod can drive the rotating shaft to rotate 90° in a single time, and the position replacement of the two hemispherical valve cores can be completed by driving twice. Of course, in other embodiments, the rotating wheel can also adopt an external gear structure, and the replacement rod can adopt a rack structure. By meshing the rack with the external gear, the rack drives the external gear to reciprocate. In this case, the position replacement of the two hemispherical valve cores can be completed in a one-way movement process of the rack.

[0043] Combination Figures 1 to 5 As shown, the working process of the regulating valve in this embodiment is as follows:

[0044] Figure 1 As shown, the regulating valve of this embodiment is in a closed state, that is, the regulating rod 13 drives the valve sleeve 2 to move to a position where the second hemispherical valve core 42 is in contact with the valve body 1. At this time, the inlet 6 and the outlet 7 are in a disconnected state, and the replacement rod 5 is maintained at a position away from the rotor 14 under the action of the replacement spring 18, and the rotating shaft 3 is maintained in a fixed position under the cooperation of the two spring leaves 17 and the limit section 142, and the push rod 11 is in a position of sliding abutment against the first hemispherical valve core 41, so that the first hemispherical valve core 41 and the second hemispherical valve core 42 are maintained in a state of forming a complete sphere.

[0045] When it is necessary to adjust the flow rate through the regulating valve, the regulating rod 13 is rotated to drive the valve sleeve 2 to move vertically relative to the valve body 1, thereby driving the second hemispherical valve core 42 to move relative to the valve body 1 to change the flow area of ​​the channel between the inlet 6 and the outlet 7, thereby realizing the flow rate regulation through the regulating valve.

[0046] When the valve core needs to be replaced, that is, when the positions of the first hemispherical valve core 41 and the second hemispherical valve core 42 are switched, first, the replacement rod 5 is pressed to overcome the replacement spring 18 and drive the one-way push plate 15 to move in the direction close to the ratchet 141. When the one-way push plate 15 contacts the ratchet 141 and continues to move downward, the limit section 142 overcomes the force of the spring sheet 17 to make the ratchet 141 rotate 90°, that is, the driving shaft 3 drives the two hemispherical valve cores to rotate 90°; then, the pressure on the replacement rod 5 is released, and the replacement rod 5 is driven to move upward under the restoring force of the replacement spring 18. When the one-way push plate 15 contacts the ratchet 141, on the one hand, the one-way push plate 15 overcomes the push plate spring 17, and on the other hand, the one-way push plate 15 overcomes the push plate spring 17. The spring 16 rotates, and on the other hand, the spring sheet 17 is in contact with the limiting straight edge in the limiting section 142 to form a rotation limit for the ratchet 141, so that the one-way push plate 15 slides over the ratchet 141 while the ratchet 141 remains stationary; then, the replacement rod 5 is pressed again to make the ratchet 141 rotate 90° again, that is, the shaft 3 drives the two hemispherical valve cores to rotate 90° again, thereby completing the position replacement of the first hemispherical valve core 41 and the second hemispherical valve core 42, switching the first hemispherical valve core 41 to form a contact seal with the sealing element 8 and controlling the flow area of ​​the fluid channel between the inlet 6 and the outlet 7. During this process, the valve sleeve 2 keeps its position unchanged and has no effect on the flow through the regulating valve.

[0047] Afterwards, by utilizing the magnetic adsorption connection between the magnet 12 in the push rod 11 and the second hemispherical valve core 42, the second hemispherical valve core 42 can be taken out from the valve sleeve 2 through the push rod 11, and after the second hemispherical valve core 42 is replaced and maintained, it can be put back into the valve sleeve 2 to prepare for subsequent replacement with the first hemispherical valve core 41.

Claims

1. A regulating valve, characterized in that: The utility model comprises a valve body, a valve sleeve, a rotating shaft, two hemispherical valve cores and a replacement rod; the valve body is provided with an inlet and an outlet, the valve sleeve is movably connected with the valve body, and one end of the valve sleeve is located between the inlet and the outlet inside the valve body as a sealing end; the rotating shaft is located at the sealing end and is rotatably connected with the valve sleeve in a horizontal direction, and one end of the rotating shaft extends out of the valve sleeve; the replacement rod is movably connected with the valve body, and one end of the replacing rod extends into the interior of the valve body and can be connected with one end of the rotating shaft extending out of the valve sleeve to drive the rotating shaft to rotate relative to the valve sleeve; the two hemispherical valve cores have the same shape and are respectively located on both sides of the rotating shaft and form a complete spherical body, which can rotate with the rotating shaft and reciprocate with the valve sleeve, wherein the hemispherical valve core located close to the sealing end forms a contact seal with the sealing end, and extends out of the sealing end to form a contact seal with the valve body; The sealing end of the valve sleeve adopts a closed-end design, and the part of the rotating shaft located at the valve sleeve is provided with two guide rods and two pre-tightening springs; the two guide rods are arranged on both sides of the rotating shaft along the axial direction of the valve sleeve, and respectively form a sliding connection with two hemispherical valve cores, and the pre-tightening springs are located between the guide rods and the hemispherical valve cores to drive the hemispherical valve cores to move in the direction away from the rotating shaft; a push rod is provided inside the valve sleeve, one end of the push rod is connected to the valve sleeve, and the other end forms a sliding abutment with the hemispherical valve core away from the sealing end, so that the hemispherical valve core moves in the direction close to the rotating shaft.

2. The regulating valve according to claim 1, characterized in that: The push rod is connected to the valve sleeve by threads.

3. The regulating valve according to claim 2, characterized in that: A magnet is arranged at one end of the push rod in contact with the hemispherical valve core, and the hemispherical valve core is made of magnetic metal.

4. The regulating valve according to claim 3, characterized in that: The guide rod is a square rod, and the hemispherical valve core is provided with a square hole corresponding to the guide rod.

5. The regulating valve according to claim 1, characterized in that: The regulating valve also includes a regulating rod, which is arranged along the axial direction of the valve sleeve, one end of which is connected to the valve body, and the other end of which is connected to the valve sleeve, so as to drive the valve sleeve to perform reciprocating linear movement relative to the valve body.

6. The regulating valve according to claim 5, characterized in that: The regulating rod is a screw rod; one end of the regulating rod is in sliding connection with the valve body for relative rotation, and the other end is in threaded connection with the valve sleeve.

7. The regulating valve according to claim 1, characterized in that: A rotating wheel is provided at one end of the rotating shaft located outside the valve sleeve, and the replacement rod can be connected to the rotating wheel to drive the rotating wheel to rotate.

8. The regulating valve according to claim 7, characterized in that: The rotating wheel is provided with a ratchet wheel, and the end of the changing rod is provided with a one-way push plate and a push plate spring; the one-way push plate is rotatably connected with the changing rod, and the push plate spring is located between the changing rod and the one-way push plate to drive the one-way push plate to rotate upward to maintain a fixed position with the changing rod; When the changing rod moves downward, the push plate spring drives the one-way push plate to be located at a fixed position, so as to form contact with the ratchet wheel and drive the ratchet wheel to rotate; When the changing rod moves upward, the one-way push plate overcomes the push plate spring to rotate and slide over the ratchet, and the ratchet remains fixed.

9. The regulating valve according to claim 8, characterized in that: The regulating valve is also provided with a spring sheet, and the rotating wheel is also provided with a limiting section, and the outer circumferential surface of the limiting section is provided with a limiting straight edge; the spring sheet is arranged on the valve sleeve along the vertical direction and can be in contact with the limiting straight edge of the limiting section to limit the rotation of the rotating wheel.

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