High-pressure-resistant pressure reducing valve

Abstract

The utility model relates to the technical field of pressure reducing valves, in particular to a high-pressure-resistant pressure reducing valve which comprises a valve body, a first-stage pressure reducing structure, a second-stage pressure reducing structure, a circulation cavity, a first-stage pressure reducing cavity, a second-stage pressure reducing cavity and an exhaust pipe. The circulation cavity, the first-stage pressure reducing cavity and the second-stage pressure reducing cavity are sequentially arranged in the valve body from bottom to top, and the exhaust pipe is arranged on one side of the first-stage pressure reducing cavity and one side of the second-stage pressure reducing cavity. One end of the air inlet pipe is communicated with the circulation cavity, the air outlet channel is communicated with the circulation cavity and the exhaust pipe, the pressure relief channel is communicated with the first-stage pressure reduction cavity and the exhaust pipe, one end of the pressure relief pipe extends into the valve body and is communicated with the second-stage pressure reduction cavity, and the first-stage pressure reduction cavity is communicated with the second-stage pressure reduction cavity through a first-stage pressure reduction structure. The second-stage pressure reduction cavity is communicated with the first-stage pressure reduction cavity through a connecting channel, and the second-stage pressure reduction structure is used for controlling connection and disconnection of the second-stage pressure reduction cavity and the connecting channel; by means of the two-stage pressure reduction structure, the pressure reduction valve is suitable for pressure reduction of pipelines with different pressures, and the applicability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve resistant to high pressure. Background Technique

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically maintain the outlet pressure stable. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. For example, a pressure reducing valve disclosed in a Chinese patent with the authorized announcement number CN211423484U includes: a valve seat provided with a gas inlet, a gas outlet and an inner cavity, wherein the gas inlet is communicated with the gas outlet through the inner cavity; a valve core movably accommodated in the inner cavity, and the outer surface of the valve core is in airtight contact with the inner surface of the inner cavity; a spring accommodated in the inner cavity and applying an elastic force to the valve core; wherein, the valve core is a hollow cylinder with one end open and the other end closed, and the open end of the valve core is configured to be able to communicate with the gas inlet; and an opening is provided on the side wall of the valve core, and the opening is configured such that when the valve core moves in the inner cavity, the effective flow area of the opening communicating with the gas outlet increases or decreases correspondingly as the pressure of the gas inlet increases or decreases. The pressure reducing valve of the present application can achieve pressure stability faster.

[0003] However, in practical applications, the above pressure reducing valve still has the following problems: only a primary pressure reducing structure is provided in the above pressure reducing valve. When using the primary pressure reducing structure, during the process of increasing air pressure, the valve core gradually slides downward in the inner cavity until the top end of the valve core, the inside of the valve core and the opening communicate with the second recess and the first recess, and the pressure reducing effect reaches the maximum. If the air pressure continues to rise at this time, it is impossible to produce a pressure reducing effect on the air pressure in the pipeline. Therefore, the above pressure reducing valve can only be applied to pipelines with relatively small air pressure, and the applicability is poor. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pressure reducing valve resistant to high pressure in view of the above deficiencies, so that it is applicable to pipelines with different pressure levels for pressure reduction through a secondary pressure reducing structure, and the applicability is better.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pressure reducing valve resistant to high pressure, comprising a valve body, a flow cavity, a primary pressure reducing cavity and a secondary pressure reducing cavity which are sequentially arranged in the valve body from bottom to top, a primary pressure reducing structure arranged in the primary pressure reducing cavity, a secondary pressure reducing structure arranged in the secondary pressure reducing cavity, an exhaust pipe arranged on one side of the primary pressure reducing cavity and the secondary pressure reducing cavity, an air inlet pipe with one end communicating with the flow cavity, an air outlet channel communicating the flow cavity and the exhaust pipe, a pressure relief channel communicating the primary pressure reducing cavity and the exhaust pipe, and a pressure relief pipe with one end extending into the interior of the valve body and communicating with the secondary pressure reducing cavity. The primary pressure reducing cavity and the secondary pressure reducing cavity are communicated through the primary pressure reducing structure. The secondary pressure reducing cavity and the primary pressure reducing cavity are communicated through a connection channel. The secondary pressure reducing structure is used to control the on-off of the secondary pressure reducing cavity and the connection channel.

[0007] Further, the flow cavity and the primary pressure reducing cavity are communicated through a connection port. The primary pressure reducing structure includes a valve core slidably connected up and down in the primary pressure reducing cavity, a first telescopic rod coaxially arranged with the valve core, and a first spring sleeved on the first telescopic rod. The starting end and the ending end of the first spring are respectively communicated with the top wall of the primary pressure reducing cavity and the top end of the valve core. When the first spring is in an unloaded state, the bottom end of the valve core abuts into the connection port to block the connection port.

[0008] Further, the connection port is conical, the small end of the connection port is arranged downward, and the bottom end of the valve core is adapted to the shape of the connection port.

[0009] Further, the top end of the connection channel communicates with the leftmost end of the secondary pressure reducing cavity. The secondary pressure reducing structure includes a valve ball slidably connected left and right in the secondary pressure reducing cavity, a second telescopic rod connected to the left end of the valve ball, and a second spring sleeved on the second telescopic rod. The starting end and the ending end of the second spring are respectively connected to the valve ball and the rightmost end of the secondary pressure reducing cavity. When the second spring is in an unloaded state, the valve ball blocks the air outlet end of the connection channel.

[0010] Further, a pressure relief channel is connected between the secondary pressure reducing cavity and the pressure relief pipe.

[0011] The beneficial effects of the present utility model are as follows:

[0012] In practical applications, under normal air pressure, air is introduced into the flow cavity through the air inlet pipe, and the air flow is discharged from the air outlet channel through the exhaust pipe. When the air pressure is on the high side, the air flow pushes the primary pressure reducing structure to connect the primary pressure reducing cavity and the flow cavity, so that the air flow can also be discharged from the air outlet channel through the primary pressure reducing cavity and the pressure relief channel. When the air pressure continues to rise, the high-pressure air flow pushes the secondary pressure reducing structure through the connection channel into the secondary pressure reducing cavity and then is discharged through the pressure relief pipe for pressure relief. The present utility model is applicable to pressure reduction of pipelines with different pressure magnitudes through the secondary pressure reducing structure, and has better applicability. Description of the Drawings

[0013] Figure 1 is the overall structural schematic diagram of the present utility model;

[0014] Figure 2 is the top view of the present utility model;

[0015] Figure 3 is Figure 2 the sectional view at A - A in

[0016] Reference numerals: valve body 1; air outlet passage 111; primary decompression chamber 12; pressure relief passage 121; secondary decompression chamber 13; pressure relief pipe 131; air release passage 132; exhaust pipe 14; intake pipe 15; connection passage 16; connection port 17; valve core 21; first telescopic rod 22; first spring 23; valve ball 31; second telescopic rod 32; second spring 33. Specific embodiments

[0017] As Figure 1 、 Figure 2 and Figure 3 shown, a pressure reducing valve resistant to high pressure includes a valve body 1, a flow chamber 11, a primary decompression chamber 12, and a secondary decompression chamber 13 which are sequentially arranged in the valve body 1 from bottom to top, a primary decompression structure arranged in the primary decompression chamber 12, a secondary decompression structure arranged in the secondary decompression chamber 13, an exhaust pipe 14 arranged on one side of the primary decompression chamber 12 and the secondary decompression chamber 13, an intake pipe 15 with one end communicating with the flow chamber 11, an air outlet passage 111 communicating the flow chamber 11 and the exhaust pipe 14, a pressure relief passage 121 communicating the primary decompression chamber 12 and the exhaust pipe 14, and a pressure relief pipe 131 with one end extending into the interior of the valve body 1 and communicating with the secondary decompression chamber 13. The primary decompression chamber 12 and the secondary decompression chamber 13 are communicated through the primary decompression structure, the secondary decompression chamber 13 and the primary decompression chamber 12 are communicated through a connection passage 16, and the secondary decompression structure is used to control the on - off of the secondary decompression chamber 13 and the connection passage 16.

[0018] Under normal air pressure, air is introduced into the flow chamber 11 through the intake pipe 15, and the air flow is discharged from the air outlet passage 111 through the exhaust pipe 14; when the air pressure is on the high side, the air flow pushes the primary decompression structure, making the primary decompression chamber 12 communicate with the flow chamber 11, so that the air flow can also be discharged from the air outlet passage 111 through the primary decompression chamber 12 and the pressure relief passage 121; when the air pressure continues to rise, the high - pressure air flow pushes the secondary decompression structure through the connection passage 16 into the secondary decompression chamber 13 and then is discharged for pressure relief through the pressure relief pipe 131. The present utility model is applicable to pipeline pressure reduction with different pressure magnitudes through the secondary decompression structure, and has better applicability.

[0019] As Figure 1 、 Figure 2 and Figure 3As shown, the flow cavity 11 communicates with the first-stage pressure reduction cavity 12 through a connection port 17; the first-stage pressure reduction structure includes a valve core 21 slidably connected up and down in the first-stage pressure reduction cavity 12, a first telescopic rod 22 coaxially arranged with the valve core 21, and a first spring 23 sleeved on the first telescopic rod 22. The starting end and the ending end of the first spring 23 communicate with the top wall of the first-stage pressure reduction cavity 12 and the top end of the valve core 21 respectively. When the first spring 23 is in an unloaded state, the bottom end of the valve core 21 abuts into the connection port 17 to block the connection port 17; in this embodiment, under normal air pressure, air is introduced into the flow cavity 11 through the air inlet pipe 15, and the air flow is discharged from the air outlet channel 111 through the exhaust pipe 14; when the air pressure is on the high side, the gas pushes the valve core 21 to slide upward, the first spring 23 is compressed, the connection port 17 connects the first-stage pressure reduction cavity 12 with the flow cavity 11, and the air flow can also be discharged from the air outlet channel 111 through the first-stage pressure reduction cavity 12 and the pressure relief channel 121.

[0020] As Figure 1 , Figure 2 and Figure 3 shown, the connection port 17 is conical, the small-end of the connection port 17 is arranged downward, and the bottom end of the valve core 21 is adapted to the shape of the connection port 17; in this embodiment, when the connection port 17 is conical, the force-bearing area that the gas can push is smaller.

[0021] As Figure 1 , Figure 2 and Figure 3 shown, the top end of the connection channel 16 communicates with the leftmost end of the second-stage pressure reduction cavity 13; the second-stage pressure reduction structure includes a valve ball 31 slidably connected left and right in the second-stage pressure reduction cavity 13, a second telescopic rod 32 connected to the left end of the valve ball 31, and a second spring 33 sleeved on the second telescopic rod 32. The starting end and the ending end of the second spring 33 are connected to the valve ball 31 and the rightmost end of the second-stage pressure reduction cavity 13 respectively. When the second spring 33 is in an unloaded state, the valve ball 31 blocks the air outlet end of the connection channel 16; in this embodiment, the high-pressure air flow in the connection channel 16 pushes the valve ball 31 to move rightward along the second-stage pressure reduction cavity 13, and the high-pressure air flow is discharged from the pressure relief pipe 131 through the second-stage pressure reduction cavity 13 at the left end of the valve ball 31.

[0022] As Figure 1 , Figure 2 and Figure 3 shown, a pressure relief channel 132 is connected between the second-stage pressure reduction cavity 13 and the pressure relief pipe 131; in this embodiment, during the process of the valve ball 31 moving rightward along the second-stage pressure reduction cavity 13, the second-stage pressure reduction cavity 13 at the right end of the valve ball 31 is exhausted through the pressure relief channel 132.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the scope defined by the spirit of the present utility model.

Claims

1. A high pressure resistant pressure reducing valve, characterized in that: The invention comprises a valve body (1), a circulation chamber (11), a primary pressure-reducing chamber (12) and a secondary pressure-reducing chamber (13) arranged in sequence from bottom to top in the valve body (1), a primary pressure-reducing structure arranged in the primary pressure-reducing chamber (12), a secondary pressure-reducing structure arranged in the secondary pressure-reducing chamber (13), an exhaust pipe (14) arranged on one side of the primary pressure-reducing chamber (12) and the secondary pressure-reducing chamber (13), an air inlet pipe (15) having one end connected to the circulation chamber (11), an air outlet pipe (15) connecting the circulation chamber (11) and the exhaust pipe (14), and a secondary pressure-reducing chamber (13) arranged on one side of the primary pressure-reducing chamber (12) and the secondary pressure-reducing chamber (13). The valve body (1) is provided with a pressure relief passage (111) connecting the first pressure relief chamber (12) and the exhaust pipe (14), and a pressure relief pipe (131) having one end extending into the interior of the valve body (1) and connecting the second pressure relief chamber (13). The first pressure relief chamber (12) and the second pressure relief chamber (13) are connected via a first pressure relief structure, and the second pressure relief chamber (13) and the first pressure relief chamber (12) are connected via a connecting passage (16). The second pressure relief structure is used to control the opening and closing of the second pressure relief chamber (13) and the connecting passage (16).

2. A high pressure resistant pressure reducing valve according to claim 1, characterized in that: The circulation chamber (11) is connected to the primary decompression chamber (12) via a connecting port (17); the primary decompression structure comprises a valve core (21) slidably connected to the primary decompression chamber (12), a telescopic rod (22) coaxially arranged with the valve core (21), and a spring (23) sleeved on the telescopic rod (22); the starting end and the end of the spring (23) are respectively connected to the top wall of the primary decompression chamber (12) and the top of the valve core (21); when the spring (23) is in a stress-free state, the bottom end of the valve core (21) presses into the connecting port (17) to block the connecting port (17).

3. A high pressure resistant pressure reducing valve according to claim 2, characterized in that: The connecting port (17) is conical, the small end of the connecting port (17) is arranged downward, and the bottom end of the valve core (21) is adapted to the shape of the connecting port (17).

4. A high pressure resistant pressure reducing valve according to claim 2, characterized in that: The top end of the connecting passage (16) is connected to the leftmost end of the secondary decompression chamber (13); the secondary decompression structure comprises a valve ball (31) slidably connected to the secondary decompression chamber (13) from left to right, a telescopic rod (32) connected to the valve ball (31) at the left end, a spring (33) sleeved on the telescopic rod (32), the starting end and the end end of the spring (33) being respectively connected to the valve ball (31) and the rightmost end of the secondary decompression chamber (13); when the spring (33) is in a state of being unstressed, the valve ball (31) blocks the air outlet end of the connecting passage (16).

5. A high pressure resistant pressure reducing valve according to claim 2, characterized in that: A gas relief passage (132) is connected between the secondary decompression chamber (13) and the pressure relief pipe (131).

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