Gas valve

Abstract

The utility model provides a gas valve which comprises a pressure regulating device and a valve seat, the pressure regulating device comprises a rotating shaft, a pressure regulating nut and a limiting piece, the limiting piece is in fixed connection or limiting connection with the rotating shaft and located above the pressure regulating nut, the pressure regulating nut is in threaded fit with the rotating shaft, and the valve seat is in threaded fit with the rotating shaft. The pressure regulating nut can perform axial displacement relative to the valve seat; the pressure regulating nut is provided with a first cambered surface part protruding towards the limiting piece and / or the limiting piece is provided with a second cambered surface part protruding towards the pressure regulating nut, and the first cambered surface part can abut against the second cambered surface part. When the pressure regulating nut axially moves to the upper limit position, the contact area between the pressure regulating nut and the limiting piece is relatively reduced, the locking pre-tightening force between the pressure regulating nut and the limiting piece can be relatively reduced, and the initial starting voltage requirement of a stepping motor for driving the rotating shaft to rotate is relatively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of gas control, and in particular to a gas valve. Background Art

[0002] The gas valves currently on the market include a valve body and an electromagnetic drive device. The valve body is provided with a valve outlet. The electromagnetic drive device includes a threaded part, a gasket, a rotating shaft and an elastic part. When the threaded part moves up and down, a locking pre-tightening force is generated when the displacement top collides with the gasket, which can easily affect the initial starting voltage of the stepper motor. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a gas valve, the gas valve comprising a pressure regulating device and a valve seat, the pressure regulating device comprising a rotating shaft, a pressure regulating nut, and a limiter, the limiter is fixedly connected or limit-connected to the rotating shaft, the limiter is located above the pressure regulating nut, the pressure regulating nut is threadably matched with the rotating shaft, and the pressure regulating nut can be axially displaced relative to the valve seat;

[0004] The pressure-adjusting nut is provided with a first arcuate surface portion protruding toward the limiting member and / or the limiting member is provided with a second arcuate surface portion protruding toward the pressure-adjusting nut, and the first arcuate surface portion can abut against the second arcuate surface portion.

[0005] The gas valve provided in the present application, when the pressure-regulating nut is axially displaced to the upper limit position, because the pressure-regulating nut is provided with a first arc surface portion convex toward the limiting member and / or the limiting member is provided with a second arc surface portion convex toward the pressure-regulating nut, the first arc surface portion can be offset against the second arc surface portion, and the contact area between the pressure-regulating nut and the limiting member is relatively reduced, which can relatively reduce the locking pre-tightening force between the pressure-regulating nut and the limiting member, and relatively reduce the initial starting voltage requirement of the stepping motor that drives the rotating shaft to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A cross-sectional view of a partial structure of an embodiment of a gas valve provided in the present application;

[0007] Figure 2 for Figure 1 An enlarged view of the pressure regulating nut and valve seat in the figure;

[0008] Figure 3 for Figure 1 Enlarged view of the middle pressure regulating nut;

[0009] Figure 4 for Figure 1 A three-dimensional view of the middle pressure regulating nut;

[0010] Figure 5 It is a cross-sectional view of a state in which the first arc surface portion of the pressure regulating nut abuts against the lower end surface of the limiting member;

[0011] Figure 6 A cross-sectional view of an embodiment of a stopper;

[0012] Figure 7 for Figure 2 A top view of

[0013] The following are the descriptions of the reference numerals:

[0014] 1 rotating shaft, 2 pressure regulating nut, 21 sleeve body, 211 outer sleeve portion, 212 inner sleeve portion, 213 annular groove portion, 22 anti-rotation protrusion, A first arc portion, A1 first straight area, C avoidance recess, 3 limiting member, B second arc portion, B1 second straight area, 4 elastic member, 5 diaphragm assembly, 6 stepping motor, 7 valve seat, 71 anti-rotation groove portion, 72 limiting boss. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] like Figure 1 and Figure 2 As shown, the gas valve provided in the present application includes a pressure regulating device and a valve seat 7. The pressure regulating device includes a rotating shaft 1, a pressure regulating nut 2 and a stopper 3. The stopper 3 can be a gasket or other blocking structure.

[0017] The limiting member 3 is fixedly connected or position-limitingly connected to the rotating shaft 1, and the limiting member 3 is located above the pressure regulating nut 2. In the figure, the limiting member 3 is position-limitingly connected to the step surface on the rotating shaft 1.

[0018] The pressure regulating nut 2 is threadedly matched with the rotating shaft 1. The pressure regulating nut 2 can be axially displaced relative to the valve seat 7, that is, it can move upward relative to the valve seat 7 to approach the limiter 3, and can also move downward relative to the valve seat 7 to move away from the limiter 3. When the pressure regulating nut 3 is displaced to the upper limit position relative to the valve seat 7, it abuts against the limiter 3, and the limiter 3 limits the upper limit position of the pressure regulating nut 3 relative to the valve seat 7.

[0019] like Figure 3 and Figure 4 As shown, the pressure regulating nut 2 is provided with a first arc surface A convex toward the stopper 3. More specifically, the first arc surface A can be provided with a first straight area A1, which is approximately located inside the first arc surface A (close to the side of the rotating shaft 1).

[0020] like Figure 5 As shown, when the pressure regulating nut 2 is displaced to the upper limit position, the first arc surface A abuts against the limiter 3. More specifically, when the first arc surface A abuts against the limiter 3, the first straight area A1 is in surface contact with the limiter 3.

[0021] like Figure 6 As shown, the stopper 3 is provided with a second arc portion B convex to the pressure regulating nut 2. More specifically, the second arc portion B can be provided with a second straight region B1, and the second straight region B1 is approximately located inside the second arc portion B (the side close to the rotating shaft 1). More specifically, the lower end surface of the stopper 3 is at least partially tilted downward and / or bent to form the second arc portion B.

[0022] When the pressure regulating nut 2 is displaced to the upper limit position, the pressure regulating nut 2 abuts against the second arc surface B. More specifically, when the pressure regulating nut 2 abuts against the second arc surface B, the pressure regulating nut 2 is in surface contact with the second straight area B1.

[0023] When the pressure-adjusting nut 2 is provided with the first arc surface A, the limiting member 3 may be provided with the second arc surface B or may not be provided with the second arc surface B.

[0024] When the limiting member 3 is provided with the second arc portion B, the pressure regulating nut 2 may be provided with the first arc portion A or may not be provided with the first arc portion A.

[0025] When the pressure regulating nut 2 is provided with a first arc surface A and the limiting member 3 is provided with a second arc surface B, when the pressure regulating nut 2 is displaced to the upper limit position, the first arc surface A abuts against the second arc surface B. More specifically, the first straight area A1 of the first arc surface A and the second straight area B1 of the second arc surface B are in surface contact.

[0026] The pressure-adjusting nut 2 is provided with the above-mentioned first arc surface portion A and / or the limiting member 3 is provided with the above-mentioned second arc surface portion B, so that when the pressure-adjusting nut 2 is displaced to the upper limit position, the contact area between the pressure-adjusting nut 2 and the limiting member 3 is relatively reduced, which can relatively reduce the locking preload force between the pressure-adjusting nut 2 and the limiting member 3, and relatively reduce the initial starting voltage requirement of the stepping motor 6 used to drive the rotating shaft 1 to rotate.

[0027] More specifically, Figure 1 As shown, the pressure regulating device also includes an elastic member 4 and a diaphragm assembly 5. The elastic member 4 can be a spiral spring or a reed structure. The upper end of the elastic member 4 is located in the annular groove portion 213 and is sleeved outside the inner sleeve portion 212, and the lower end of the elastic member 4 is against the diaphragm assembly 5. The gas valve also includes a valve body (not shown in the figure). The valve seat 7 is fixedly connected to the valve body. The valve body is provided with a valve outlet.

[0028] As the pressure regulating nut 2 moves upward, the compression of the elastic member 4 gradually decreases, and the elastic force applied by the elastic member 4 to the diaphragm assembly 5 gradually decreases. At this time, the diaphragm assembly 5 gradually moves away from the valve outlet. As the pressure regulating nut 2 moves downward, the compression of the elastic member 4 gradually increases, and the elastic force applied by the elastic member 4 to the diaphragm assembly 5 gradually increases. At this time, the diaphragm assembly 5 gradually approaches the valve outlet. In this way, the pressure regulation of the valve outlet is achieved.

[0029] like Figure 1 As shown, the valve seat 7 is provided with a limiting boss 72, which protrudes from the inner wall of the valve seat 7 toward the inside of the valve seat 7. When the pressure regulating nut 2 moves to the lower limit position, it abuts against the limiting boss 72, and the lower limit position of the pressure regulating nut 2 is limited by the limiting boss 72.

[0030] like Figure 1 As shown, the gas valve further includes a driving component, which drives the rotating shaft 1 to rotate. The driving component may be a stepper motor 6, and the output shaft of the stepper motor 6 is fixedly connected to or integrated with the rotating shaft 1. By using the stepper motor 6, stepless or multi-stage gas pressure regulation can be achieved. Of course, the driving component is not limited to the motor, and for example, an electromagnetic driving structure including a moving iron core and a stationary iron core may also be used.

[0031] More specifically, Figure 3 As shown, the pressure regulating nut 2 includes a sleeve 21, and the upper end surface of the sleeve 21 is at least partially inclined and / or bent upward to form the above-mentioned first arc surface A. The sleeve 21 includes an outer sleeve 211 and an inner sleeve 212. The upper end of the outer sleeve 211 and the upper end of the inner sleeve 212 are integrally formed. The lower end of the inner sleeve 212 extends out of the outer sleeve 211 to enhance the support and guiding effect on the elastic member 4. An annular groove 213 is provided between the outer sleeve 211 and the inner sleeve 212. When the pressure regulating nut 2 is displaced to the lower limit position, the outer sleeve 211 abuts against the limiting boss 72.

[0032] like Figure 4 As shown, the pressure regulating nut 2 further includes an anti-rotation protrusion 22 arranged on the outer periphery of the sleeve 21. The connection position between the anti-rotation protrusion 22 and the sleeve 21 is concave to form an avoidance recess C. The avoidance recess C can adopt a rounded structure, and the anti-rotation protrusion 22 and the sleeve 21 have a smooth transition through the rounded structure.

[0033] like Figure 7 As shown, the sleeve 21 is sleeved on the outer periphery of the rotating shaft 1 and is threadedly matched with the rotating shaft 1. An anti-rotation groove 71 is provided inside the valve seat 7. The anti-rotation protrusion 22 is at least partially located in the anti-rotation groove 71, so as to realize the limiting connection between the pressure regulating nut 2 and the valve seat 7. When the rotating shaft 1 rotates, the anti-rotation protrusion 22 abuts against the side wall of the anti-rotation groove 71, so that the pressure regulating nut 2 cannot rotate with the rotating shaft 1, but will move axially along the rotating shaft 1 as the rotating shaft 1 rotates. Of course, the limiting connection method between the pressure regulating nut 2 and the valve seat 7 is not limited to this, as long as the structure can limit the rotation of the pressure regulating nut 2 without affecting the axial movement of the pressure regulating nut 2, for example, the positions of the anti-rotation protrusion 22 and the anti-rotation groove can be swapped, and a limiting pin can also be used to realize the limiting connection between the pressure regulating nut 2 and the valve seat 7.

[0034] like Figure 7As shown, there is a gap between the avoidance recess C and the anti-rotation groove 71. This arrangement can reduce the friction resistance of the adjusting nut during axial movement, so that on the one hand, the axial movement smoothness of the pressure regulating nut 2 can be improved, making the pressure regulating response faster and more accurate, and on the other hand, the damage probability of the driving components can be further reduced, thereby improving the reliability of the pressure regulating device.

[0035] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A gas valve, characterized in that: The gas valve comprises a pressure regulating device and a valve seat (7), the pressure regulating device comprises a rotating shaft (1), a pressure regulating nut (2), and a limiting member (3), the limiting member (3) being fixedly connected or limitatively connected to the rotating shaft (1), the limiting member (3) being located above the pressure regulating nut (2), the pressure regulating nut (2) being threadably matched with the rotating shaft (1), and the pressure regulating nut (2) being capable of axial displacement relative to the valve seat (7); The pressure-adjusting nut (2) is provided with a first arcuate portion (A) protruding toward the limiting member (3) and / or the limiting member (3) is provided with a second arcuate portion (B) protruding toward the pressure-adjusting nut (2), and the first arcuate portion (A) can abut against the second arcuate portion (B).

2. The gas valve according to claim 1, characterized in that: The upper end surface of the pressure-adjusting nut (2) is at least partially inclined and / or bent upward to form the first arc surface (A); the lower end surface of the limiting member (3) is at least partially inclined and / or bent downward to form the second arc surface (B).

3. The gas valve according to claim 1, characterized in that: The first arcuate surface (A) is provided with a first straight area (A1) and / or the second arcuate surface (B) is provided with a second straight area (B1), and the first straight area (A1) can be in surface contact with the second straight area (B1).

4. The gas valve according to any one of claims 1 to 3, characterized in that: The pressure regulating nut (2) comprises a sleeve body (21) sleeved on the outer periphery of the rotating shaft (1) and an anti-rotation protrusion (22) arranged on the outer periphery of the sleeve body (21); an anti-rotation groove portion (71) is provided inside the valve seat (7); and the anti-rotation protrusion (22) is at least partially located in the anti-rotation groove portion (71), thereby realizing a limited connection between the pressure regulating nut (2) and the valve seat (7).

5. The gas valve according to claim 4, characterized in that: The connection position between the anti-rotation protrusion (22) and the sleeve body (21) is concave to form an avoidance recess (C), and a gap exists between the avoidance recess (C) and the side wall of the anti-rotation groove (71).

6. The gas valve according to claim 5, characterized in that: The avoidance recess (C) is a rounded structure, and the anti-rotation protrusion (22) and the sleeve body (21) are smoothly transitioned through the rounded structure.

7. The gas valve according to claim 4, characterized in that: The sleeve body (21) comprises an outer sleeve portion (211) and an inner sleeve portion (212); the upper ends of the outer sleeve portion (211) and the inner sleeve portion (212) are integrally formed, the lower end of the inner sleeve portion (212) extends out of the outer sleeve portion (211), and an annular groove portion (213) is provided between the outer sleeve portion (211) and the inner sleeve portion (212).

8. The gas valve according to claim 7, characterized in that: The pressure regulating device comprises an elastic member (4) and a diaphragm assembly (5); the upper end of the elastic member (4) is located in the annular groove portion (213) and is sleeved outside the inner sleeve portion (212); the lower end of the elastic member (4) is in contact with the diaphragm assembly (5); the gas valve comprises a valve body; the valve seat (7) is fixedly connected to the valve body; the valve body is provided with a valve outlet portion; and the diaphragm assembly (5) can approach and move away from the valve outlet portion.

9. The gas valve according to any one of claims 1 to 3, characterized in that: The valve seat (7) is provided with a limiting boss (72), and the limiting boss (72) protrudes from the inner side wall of the valve seat (7) toward the inside of the valve seat (7). When the pressure regulating nut (2) moves to the lower limit position, the pressure regulating nut (2) abuts against the limiting boss (72).

10. The gas valve according to any one of claims 1 to 3, characterized in that: The gas valve comprises a driving component for driving the rotating shaft (1) to rotate, wherein the driving component is a stepping motor (6), and the output shaft of the stepping motor (6) is fixedly connected to or integrally formed with the rotating shaft (1).

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