Gas pressure reducing valve

Abstract

The utility model provides a gas pressure reducing valve, and belongs to the technical field of valve manufacturing. The problem that an existing gas pressure reducing valve is poor in use safety is solved. The gas pressure reducing valve comprises a valve cover and a valve body, the valve cover is fixedly connected to the top of the valve body, a pressure reducing valve element is arranged in the valve body and comprises a diaphragm, a valve rod and a spring, the periphery of the diaphragm is in sealed compression joint through the valve cover and the valve body, the valve rod is vertically and fixedly connected to the diaphragm, the spring is arranged in the valve cover, the lower end of the spring acts on the diaphragm, and the upper end of the spring abuts against a blocking cover. The valve cover is in threaded connection with an adjusting rod, the lower end of the adjusting rod acts on the blocking cover, the adjusting rod is fixedly connected with a hand wheel, a limiting mechanism for limiting the rotation amount of the hand wheel is arranged between the hand wheel and the valve cover, and when the rotation amount of the hand wheel reaches the maximum value, the compression amount of the spring reaches the set maximum value so as to limit the ultimate pressure of the air outlet end. The utility model has the advantages of good use safety and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve manufacturing and relates to a pressure reducing valve, in particular to a gas pressure reducing valve. Background Art

[0002] The gas pressure reducing valve is used to reduce high-pressure gas to low-pressure gas and maintain the stability of the outlet pressure and flow rate. It is used in equipment that requires gas supply, such as beer machines and cola machines.

[0003] For example, Chinese patent literature discloses a novel high-cleanliness gas pressure reducing valve [application number: 202321997322.9; authorization announcement number: CN220505908U], which includes a valve body, the valve body is provided with an air outlet cavity, an air inlet and an air outlet connected to the air outlet cavity, an inlet cavity and a valve core cavity are provided between the air inlet and the air outlet cavity in sequence, and a diaphragm sealing surface is provided on the top of the air outlet cavity; a valve stem, the valve stem is placed in the air inlet cavity, and the two ears of the valve stem are engaged with the double concave ear grooves in the air inlet cavity; a valve seat assembly screwed into the valve core cavity; a diaphragm assembly; a valve cover, which is butt-connected to the air outlet cavity of the valve body through a nut, a reset spring is provided in the inner cavity of the valve cover, a flange edge cover of the cup mouth of the diaphragm stop sleeve is mounted on the reset spring, and a limit nut in the diaphragm stop sleeve is connected to a lifting screw; an upper cover threadedly connected to the valve cover, an adjusting spring is provided in the diaphragm stop sleeve, a spring cover is mounted on the top of the adjusting spring, and an adjusting device is connected to the spring cover at the top of the upper cover.

[0004] The above-mentioned new type of high-cleanliness gas pressure reducing valve moves the return spring to the outside of the flow channel to reduce its impact on cleanliness. It pushes the spring cover through the adjusting device to compress the adjusting spring, and then opens the valve stem through the diaphragm stop sleeve and the diaphragm assembly to set the output pressure. However, it cannot limit the maximum value of the output air pressure. When a novice or an incorrect operator occurs, the adjusting device will be turned too much, causing the output air pressure to exceed the limit air pressure set by the equipment or system, which will cause the pipes and accessories at the front end of the air outlet to crack and be damaged, and the safety of use is not ideal. Summary of the invention

[0005] The utility model aims to provide a gas pressure reducing valve with good use safety in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a gas pressure reducing valve, comprising a valve cover, a valve body with an air inlet end and an air outlet end, the valve cover is fixedly connected to the top of the valve body, a pressure reducing valve core is arranged in the valve body, the pressure reducing valve core comprises a diaphragm, a valve stem and a spring, the periphery of the diaphragm is sealed and crimped by the valve cover and the valve body, the valve stem is vertically fixedly connected to the diaphragm, a spring is arranged in the valve cover, the lower end of the spring acts on the diaphragm, the upper end of the spring touches a stop cover, the valve cover is threadedly connected with an adjusting rod, the lower end of the adjusting rod acts on the stop cover, and it is characterized in that the adjusting rod is fixedly connected with a hand wheel, and a limiting mechanism for limiting the rotation amount of the hand wheel is arranged between the hand wheel and the valve cover, when the rotation amount of the hand wheel reaches the maximum, the compression amount of the spring reaches the set maximum value to limit the limit pressure of the air outlet end.

[0007] In the above-mentioned gas pressure reducing valve, the limiting mechanism includes a limiting block 1 fixedly connected to the inner wall of the handwheel, and a limiting block 2 is provided on the top of the valve cover. When the limiting block 1 abuts against one side of the limiting block 2, the handwheel rotation amount is the smallest, and when the limiting block 1 abuts against the other side of the limiting block 2, the handwheel rotation amount is the largest.

[0008] As another case, in the above-mentioned gas pressure reducing valve, the limit mechanism includes a blocking block fixedly connected to the inner wall of the hand wheel, and the top of the valve cover is threadedly connected with a blocking screw, and when one side of the blocking block abuts against the blocking screw, the hand wheel rotates the least, and when the other side of the blocking block abuts against the blocking screw, the hand wheel rotates the most. This has a simple structure and is easy to manufacture.

[0009] In the above-mentioned gas pressure reducing valve, the lower end of the regulating rod is threadedly connected to the stop cover, the threaded sections of the regulating rod connecting the valve cover and the stop cover are in opposite directions, and the stop cover and the valve cover are circumferentially fixedly connected and axially displaced.

[0010] In the above-mentioned gas pressure reducing valve, the inner wall of the valve cover has a guide groove, and the outer wall of the blocking cover has a guide surface matched with the guide groove.

[0011] As another example, in the above-mentioned gas pressure reducing valve, the inner wall of the valve cover has a plurality of axially extending ribs, and the stop cover has a slide groove for the ribs to be embedded in and extend axially. Through the cooperation of the ribs and the slide groove, the stop cover is circumferentially fixedly connected to the valve cover and can be axially displaced, and the structure is simple.

[0012] In the above-mentioned gas pressure reducing valve, the regulating rod has a convex ring which protrudes radially outward and is used to abut against the inner wall of the top end of the valve cover.

[0013] In the above-mentioned gas pressure reducing valve, the valve body is connected to a pressure gauge 1 connected to the gas outlet end, and the valve body is also connected to a pressure gauge 2 connected to the gas inlet end.

[0014] In the above-mentioned gas pressure reducing valve, a vent hole is opened on the side of the valve body, the vent hole is threadedly connected with a plug, a pressure relief rod is arranged through the plug, the inner end portion of the pressure relief rod is conical and embedded with a sealing ring, the pressure relief rod sleeve is provided with a compression spring, one end of the compression spring abuts against the plug, and the other end of the compression spring abuts against the inner end portion of the pressure relief rod, the compression spring provides elastic force so that the inner end of the pressure relief rod and the sealing ring maintain a tendency to seal in the vent hole, the valve body has an exhaust hole 1 connected to the bottom of the vent hole, and the valve body also has an exhaust hole 2 connected to the middle of the vent hole.

[0015] In the above-mentioned gas pressure reducing valve, the valve cover and the valve body are fixedly connected by a plurality of screws.

[0016] Compared with the prior art, the gas pressure reducing valve has a compact structure, is easy to operate and is safe to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the gas pressure reducing valve.

[0018] Figure 2 It is a structural sectional view of the gas pressure reducing valve.

[0019] Figure 3 It is a three-dimensional structural diagram of the gas pressure reducing valve without the hand wheel.

[0020] Figure 4 It is a three-dimensional structural diagram of the hand wheel in the gas pressure reducing valve.

[0021] Figure 5 It is a three-dimensional structural diagram of the valve cover in the gas pressure reducing valve.

[0022] Figure 6 It is a three-dimensional structural diagram of the blocking cover, spring and adjusting rod in the gas pressure reducing valve.

[0023] In the figure, 1, valve cover; 2, air inlet end; 3, air outlet end; 4, valve body; 5, pressure reducing valve core; 6, diaphragm; 7, valve stem; 8, spring; 9, adjusting rod; 10, hand wheel; 11, limit block 1; 12, limit block 2; 13, guide groove; 14, guide surface; 15, convex ring; 16, pressure gauge 1; 17, pressure gauge 2; 18, vent hole; 19, plug; 20, pressure relief rod; 21, sealing ring; 22, compression spring; 23, exhaust hole 1; 24, exhaust hole 2; 25, screw; 26, cover; 27, upper chamber; 28, lower chamber; 29, valve seat. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1, Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the gas pressure reducing valve comprises a valve cover 1, a valve body 4 having an air inlet end 2 and an air outlet end 3, the valve cover 1 is fixedly connected to the top of the valve body 4, a pressure reducing valve core 5 is arranged in the valve body 4, the pressure reducing valve core 5 comprises a diaphragm 6, a valve stem 7 and a spring 8, the periphery of the diaphragm 6 is sealed and crimped by the valve cover 1 and the valve body 4, the valve stem 7 is vertically fixedly connected to the diaphragm 6, a spring 8 is arranged in the valve cover 1, the lower end of the spring 8 acts on the diaphragm 6, the upper end of the spring 8 touches a stop cover 26, an adjusting rod 9 is threadedly connected to the valve cover 1, the lower end of the adjusting rod 9 acts on the stop cover 26, the adjusting rod 9 is fixedly connected to a hand wheel 10, a limiting mechanism for limiting the rotation amount of the hand wheel 10 is arranged between the hand wheel 10 and the valve cover 1, when the rotation amount of the hand wheel 10 reaches the maximum, the compression amount of the spring 8 reaches the set maximum value to limit the limit pressure of the air outlet end 3.

[0026] When the gas pressure reducing valve is in use, the hand wheel 10 is used to drive the adjusting rod 9 to rotate, and the adjusting rod 9 drives the blocking cover 26 to act on the spring 8, thereby changing the compression amount of the spring 8 and adjusting the force of the spring 8 on the diaphragm 6. When the pressure at the air inlet end 2 exceeds the elastic force of the spring 8, the lower end of the valve stem 7 separates from the sealing surface to intake air to the air outlet end 3. Because the limit mechanism limits the rotation amount of the hand wheel 10, when the rotation amount of the hand wheel 10 reaches the maximum, the compression amount of the spring 8 reaches the set maximum value, and the pressure at the air inlet end 2 overcomes the elastic force of the spring 8 to provide gas with a limit pressure to the air outlet end 3. This can avoid novices or misoperation, and avoid excessive rotation of the hand wheel 10, so that the outlet pressure of the air outlet end 3 exceeds the set mechanical pressure, avoids the pipeline connected to the air outlet end 3 from rupturing, and improves the safety of use.

[0027] To further elaborate, the limiting mechanism in this embodiment includes a limiting block 11 fixedly connected to the inner wall of the hand wheel 10, and a limiting block 12 provided on the top of the valve cover 1. When the limiting block 11 abuts against one side of the limiting block 12, the rotation amount of the hand wheel 10 is the smallest, and when the limiting block 11 abuts against the other side of the limiting block 12, the rotation amount of the hand wheel 10 is the largest. The rotation amount of the hand wheel 10 is limited by the limiting block 11 and the limiting block 12, and the structure is simple and the manufacturing is convenient.

[0028] The lower end of the adjusting rod 9 is threadedly connected to the stop cover 26. The threaded directions of the threaded sections connecting the adjusting rod 9, the valve cover 1 and the stop cover 26 are opposite. The stop cover 26 and the valve cover 1 are circumferentially fixed and axially displaced. When the hand wheel 10 drives the adjusting rod 9 to rotate to increase the pressure at the outlet end 3, the adjusting rod 9 rotates relative to the valve cover 1 and moves axially downward. Because the stop cover 26 and the valve cover 1 are circumferentially fixed, the lower end of the adjusting rod 9 drives the stop cover 26 to move axially downward, so that the compression of the spring 8 increases to increase the pressure at the outlet end 3; conversely, the hand wheel 10 drives the adjusting rod 9 to move axially upward, and the bottom end of the adjusting rod 9 drives the stop cover 26 to move axially upward, so that the compression of the spring 8 decreases to reduce the pressure at the outlet end 3; through the above-mentioned settings, the stop cover 26 is accurately displaced, and the compression of the spring 8 is easy to control, so that the pressure regulation of the outlet end 3 is highly accurate.

[0029] The inner wall of the valve cover 1 has a guide groove 13, and the outer wall of the stop cover 26 has a guide surface 14 that matches the guide groove 13. Through the arrangement of the guide groove 13 and the guide surface 14, the stop cover 26 and the valve cover 1 are circumferentially fixed and can be axially displaced. In this embodiment, the number of the guide grooves 13 is six, and the outer wall of the stop cover 26 has six guide surfaces 14.

[0030] The regulating rod 9 has a convex ring 15 which protrudes radially outward and is used to abut against the inner wall of the top end of the valve cover 1. The provision of the convex ring 15 prevents the regulating rod 9 from being separated from the valve cover 1, thereby improving the safety of use.

[0031] The valve body 4 is connected to a pressure gauge 16 connected to the gas outlet 3, and the valve body 4 is also connected to a pressure gauge 2 17 connected to the gas inlet 2. The pressure reducing valve core 5 also includes a valve seat 29 that divides the inner cavity of the valve body 4 into an upper chamber 27 and a lower chamber 28. The upper chamber 27 is connected to the gas outlet 3, and the lower chamber 28 is connected to the gas inlet 2. The valve body 4 is provided with a connecting hole 1 connected to the upper chamber 27, and the pressure gauge 1 16 is connected to the connecting hole 1 to detect the pressure of the gas outlet 3. The valve body 4 is provided with a connecting hole 2 connected to the lower chamber 28, and the pressure gauge 2 17 is connected to the connecting hole 2 to detect the pressure of the gas inlet 2. Through the arrangement of the pressure gauge 1 16 and the pressure gauge 2 17, the pressure of the gas outlet 3 and the gas inlet 2 can be intuitively known, and the observation is convenient.

[0032] A vent hole 18 is provided on the side of the valve body 4, and a plug 19 is threadedly connected to the vent hole 18. A pressure relief rod 20 is arranged through the plug 19. The inner end of the pressure relief rod 20 is conical and embedded with a sealing ring 21. The pressure relief rod 20 is sleeved with a compression spring 22. One end of the compression spring 22 abuts against the plug 19, and the other end of the compression spring 22 abuts against the inner end of the pressure relief rod 20. The compression spring 22 provides elastic force so that the inner end of the pressure relief rod 20 and the sealing ring 21 maintain a tendency to seal in the vent hole 18. The valve body 4 has an exhaust hole 23 connected to the bottom of the vent hole 18, and the valve body 4 also has an exhaust hole 24 connected to the middle of the vent hole 18.

[0033] When the gas pressure reducing valve is in normal use, the air pressure in the inner chamber of the valve body 4 will not exceed the elastic force of the compression spring 22. The elastic force provided by the compression spring 22 makes the inner end of the pressure relief rod 20 and the sealing ring 21 sealed at the vent 18. When a fault occurs, the air pressure in the inner chamber of the valve body 4 exceeds the elastic force of the compression spring 22, and the gas passes through the exhaust hole 1 23, overcomes the elastic force of the compression spring 22, and pushes the pressure relief rod 20 so that its inner end and the sealing ring 21 are separated from the seal. The gas passes through the inner end of the vent 18 and is discharged from the exhaust hole 2 24, further avoiding the pressure rupture of the pipeline connected to the gas pressure reducing valve, thereby improving the safety of use. During actual manufacturing, a pull ring is connected to the outer end of the pressure relief rod 20 to facilitate manual exhaust.

[0034] The valve cover 1 and the valve body 4 are fixedly connected by a plurality of screws 25. This has a simple structure, and the valve cover 1 is easy to locate, easy to assemble and disassemble, and has good connection stability.

[0035] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The specific embodiments described in this article are only used to illustrate the spirit of the utility model. The technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar way, but they will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A gas pressure reducing valve, comprising a valve cover (1), a valve body (4) having an air inlet end (2) and an air outlet end (3), the valve cover (1) being fixedly connected to the top of the valve body (4), a pressure reducing valve core (5) being arranged in the valve body (4), the pressure reducing valve core (5) comprising a diaphragm (6), a valve stem (7) and a spring (8), the periphery of the diaphragm (6) being sealed and crimped by the valve cover (1) and the valve body (4), the valve stem (7) being vertically fixedly connected to the diaphragm (6), a spring (8) being arranged in the valve cover (1), the lower end of the spring (8) acting on the diaphragm (6), the upper end of the spring (8) contacting a stop cover (26), the valve cover (1) being threadedly connected to an adjusting rod (9), the lower end of the adjusting rod (9) acting on the stop cover (26), characterized in that: The adjusting rod (9) is fixedly connected to a hand wheel (10), and a limit mechanism for limiting the rotation amount of the hand wheel (10) is provided between the hand wheel (10) and the valve cover (1). When the rotation amount of the hand wheel (10) reaches a maximum, the compression amount of the spring (8) reaches a set maximum value to limit the limit pressure of the air outlet end (3).

2. The gas pressure reducing valve according to claim 1, characterized in that: The limiting mechanism comprises a limiting block 1 (11) fixedly connected to the inner wall of the hand wheel (10), and a limiting block 2 (12) provided on the top of the valve cover (1); when the limiting block 1 (11) abuts against one side of the limiting block 2 (12), the rotation amount of the hand wheel (10) is the smallest; and when the limiting block 1 (11) abuts against the other side of the limiting block 2 (12), the rotation amount of the hand wheel (10) is the largest.

3. The gas pressure reducing valve according to claim 1, characterized in that: The limiting mechanism comprises a blocking block fixedly connected to the inner wall of the handwheel (10), and a blocking screw (25) is threadedly connected to the top of the valve cover (1). When one side of the blocking block abuts against the blocking screw (25), the rotation amount of the handwheel (10) is the smallest, and when the other side of the blocking block abuts against the blocking screw (25), the rotation amount of the handwheel (10) is the largest.

4. The gas pressure reducing valve according to claim 1, 2 or 3, characterized in that: The lower end of the adjusting rod (9) is threadedly connected to the stop cover (26); the threaded sections of the adjusting rod (9) connecting the valve cover (1) and the stop cover (26) are in opposite directions; the stop cover (26) and the valve cover (1) are circumferentially fixedly connected and axially displaceable.

5. The gas pressure reducing valve according to claim 4, characterized in that: The inner wall of the valve cover (1) has a guide groove (13), and the outer wall of the stop cover (26) has a guide surface (14) that matches the guide groove (13).

6. The gas pressure reducing valve according to claim 5, characterized in that: The inner wall of the valve cover (1) has a plurality of axially extending convex ribs, and the stop cover (26) has an axially extending sliding groove into which the convex ribs are embedded.

7. The gas pressure reducing valve according to claim 6, characterized in that: The regulating rod (9) has a convex ring (15) which protrudes radially outward and is used to abut against the inner wall of the top end of the valve cover (1).

8. The gas pressure reducing valve according to claim 7, characterized in that: The valve body (4) is connected to a pressure gauge 1 (16) connected to the air outlet end (3), and the valve body (4) is also connected to a pressure gauge 2 (17) connected to the air inlet end (2).

9. The gas pressure reducing valve according to claim 8, characterized in that: A vent hole (18) is provided on the side of the valve body (4), and a plug (19) is threadedly connected to the vent hole (18). A pressure relief rod (20) is arranged through the plug (19). The inner end of the pressure relief rod (20) is conical and embedded with a sealing ring (21). The pressure relief rod (20) is sleeved with a compression spring (22). One end of the compression spring (22) abuts against the plug (19), and the other end of the compression spring (22) abuts against the inner end of the pressure relief rod (20). The compression spring (22) provides elastic force so that the inner end of the pressure relief rod (20) and the sealing ring (21) maintain a tendency to be sealed in the vent hole (18). The valve body (4) has an exhaust hole (23) connected to the bottom of the vent hole (18), and the valve body (4) also has an exhaust hole (24) connected to the middle of the vent hole (18).

10. The gas pressure reducing valve according to claim 9, characterized in that: The valve cover (1) and the valve body (4) are fixedly connected by a plurality of screws (25).

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