Pressure stabilizing valve

Abstract

A pressure regulating valve is disclosed, comprising a pipe body, a filter screen, and a valve assembly. The pipe body includes an inlet, an outlet, and an internal space. A radial flange divides the internal space into a first part and a second part. The filter screen is located in the first part and spaced apart from the radial flange. The valve assembly includes a valve seat, a valve plug, a first elastic element, and a piston tube. The valve seat is located in the first part and between the radial flange and the filter screen. The valve seat includes a body and a sealing body. The body has a first flow channel, and the sealing body has a second flow channel. The first elastic element is a conical spring that springs against the valve plug and the filter screen to normally block the second flow channel. The piston tube is located in the second part and moves relative to the valve seat between a connecting position and a blocking position. The piston tube also has a third flow channel corresponding to the second flow channel. Therefore, the gas flow rate can be stably controlled, and the valve assembly is easy and structurally stable.

Description

Technical Field

[0001] This utility model relates to gas control, and in particular to a pressure regulating valve. Background Technology

[0002] In existing technologies, pressure regulating valves are widely used in pneumatic systems, such as pneumatic tools, pneumatic control equipment, and industrial automation devices, to regulate and maintain stable output air pressure. However, traditional pressure regulating valve designs often rely solely on a single valve body and spring to control gas flow and pressure. If the pressure fluctuation at the air source is too large, it can easily lead to unstable output pressure, resulting in insufficient kinetic energy or momentary overload of the pneumatic tool, affecting operational stability and service life. Furthermore, some designs only have one-way blocking or single pressure limiting functions, lacking the synergistic effect of dynamic regulation and automatic pressure relief, which can easily cause wear or damage to parts when pressure accumulates.

[0003] Furthermore, existing pressure regulating valves often suffer from structural problems such as unreliable connection between the seal and the valve seat, misalignment or wear of elastic components, and unreasonable flow channel design. These issues result in insufficient gas flow control accuracy, limited pressure regulation range, and slow response speed. When used in high-pressure or frequently opened / closed applications, gas leakage, seal failure, or component deformation due to stress often occur, reducing overall reliability.

[0004] Therefore, it is necessary to provide a novel and advanced pressure regulating valve to solve the above problems. Utility Model Content

[0005] The main purpose of this utility model is to provide a pressure regulating valve that can stably control gas flow, and is easy to assemble and has good structural stability.

[0006] To achieve the above objectives, this utility model provides a pressure regulating valve, comprising: a pipe body, a filter screen, and a valve assembly. The pipe body includes an inlet, an outlet, and an internal space connecting the inlet and the outlet. A radial flange protrudes inwardly from the inner circumferential surface of the pipe body, dividing the internal space into a first portion adjacent to the inlet and a second portion adjacent to the outlet. The filter screen is disposed in the first portion, spaced apart from the radial flange. The valve assembly includes a valve seat, a valve plug, a first elastic element, a piston tube, and a second elastic element. The valve seat is disposed in the first portion and between the radial flange and the filter screen. The valve seat includes a body and a sealing body, which are integrally formed by encapsulation injection molding. The body has a first flow channel, and the sealing body has a second flow channel with a single radial dimension. The valve plug is disposed on the valve seat corresponding to the second flow channel. On one side, the first elastic element is a conical spring that springs against the valve plug and the filter screen to normally block the second flow channel; the piston tube is located in the second part and moves relative to the valve seat between a connecting position and a blocking position; the piston tube passes through a third flow channel corresponding to the second flow channel; the second elastic element springs against the piston tube and the radial flange; wherein, when the piston tube is in the connecting position, the first flow channel and the third flow channel are connected, and gas can flow from the air inlet through the first flow channel and the third flow channel to the exhaust port; when the piston tube is pushed by a gas pressure from the exhaust port and moves to the blocking position, the first flow channel and the third flow channel are not connected, and the gas pressure drives the valve plug to move away from the second flow channel via the second flow channel.

[0007] Preferably, it further includes a positioning ring connected to the outer periphery of the filter screen, wherein the width of the positioning ring is greater than the thickness of the filter screen, and the first elastic element is located in the positioning ring.

[0008] Preferably, the positioning ring has a C-shaped cross-section and includes a first edge surrounding the first elastic member and a second edge relative to the first edge, wherein the radial dimension of the first edge is greater than a radial dimension of the first elastic member, and the radial dimension of the second edge is smaller than the radial dimension of the first elastic member.

[0009] Preferably, the seat and the sealing body are made of different materials, and the hardness of the seat is greater than that of the sealing body.

[0010] Preferably, the ratio of the cross-sectional area of ​​the third flow channel to the cross-sectional area of ​​the second flow channel is between 8 and 12.

[0011] Preferably, the valve seat is movably disposed in the first part along one axis of the pipe body, and the valve seat does not contact the filter screen.

[0012] Preferably, the seat includes a first ring portion, a second ring portion, and a plurality of support portions connected between the first ring portion and the second ring portion. The second ring portion is located radially inside the first ring portion and forms a through hole. The sealing body passes through the through hole and includes a first abutting portion and a second abutting portion. The second ring portion is sandwiched between the first abutting portion and the second abutting portion.

[0013] Preferably, the outer diameter of the first abutment portion is larger than the outer diameter of the piston tube, and the first abutment portion can abut against the piston tube; the outer diameter of the second abutment portion is not smaller than the outer diameter of the valve plug, and the second abutment portion can abut against the valve plug.

[0014] Preferably, the second ring portion further includes at least one recess, and the second abutment portion engages with the at least one recess and is flush with or protrudes from one end face of the second ring portion.

[0015] Preferably, the height of the first edge protruding from the filter screen is greater than the wire diameter of the first elastic element; the seat and the sealing body are made of different materials, and the hardness of the seat is greater than the hardness of the sealing body; the seat is made of nylon material, and the sealing body is made of thermoplastic elastomer; the cross-sectional profile of the sealing body is generally I-shaped; the ratio of the cross-sectional area of ​​the third flow channel to the cross-sectional area of ​​the second flow channel is between 8 and 12; the valve seat is movably disposed in the first part along an axial direction of the pipe body, and the valve seat is not in contact with the filter screen. The seat includes a first ring portion, a second ring portion, and a plurality of support portions connected between the first ring portion and the second ring portion. The second ring portion is located radially inside the first ring portion and forms a through hole. The sealing body passes through the through hole and includes a first abutment portion and a second abutment portion. The second ring portion abuts against the first abutment portion and the second abutment portion. The outer diameter of the first abutment portion is larger than the outer diameter of the piston tube, and the first abutment portion can abut against the piston tube. The outer diameter of the second abutment portion is smaller than... The second abutment portion is smaller than the outer diameter of the valve plug, and can abut against the valve plug; the second ring portion further includes at least one recess, and the second abutment portion engages with the at least one recess and is flush with or protrudes from one end face of the second ring portion; the thickness of the second abutment portion is less than the thickness of the first abutment portion; the tube body includes a tube body, a first connector and a second connector, the first connector and the second connector are detachably screwed to opposite sides of the tube body, and the radial flange is provided on the tube body and abuts against one end face of the first connector; the first The connector further includes an annular step portion, which encloses the first part between the annular step portion and the radial flange, and the positioning ring abuts against the annular step portion in the axial direction; one end face of the second connector encloses the second part between the radial flange and the second connector, and a pressure-bearing surface of the piston tube abuts against the second connector in the axial direction; a sealing element is provided between the radial flange and the piston tube; a connecting hole is radially provided in the tube body, which connects the second part to an external space; and the elastic constant of the first elastic element is smaller than the elastic constant of the second elastic element.

[0016] The advantages of this utility model are:

[0017] The pressure regulating valve provided by this utility model can stably control the gas flow rate, and is easy to assemble with good structural stability. Attached Figure Description

[0018] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0019] Figure 2 This is an exploded view of a preferred embodiment of the present invention.

[0020] Figure 3 and Figure 4 This is a schematic diagram illustrating the operation of a preferred embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional view of a valve seat according to a preferred embodiment of the present invention.

[0022] Figure 6 This is a perspective view of another preferred embodiment of the present invention. Detailed Implementation

[0023] The following examples illustrate possible implementations of this utility model, but are not intended to limit the scope of protection of this utility model. The prefixes "a" or "at least one" before the terms mentioned herein are not intended to limit the quantity. Depending on the requirements, there may also be "multiple" items. This variation in quantity is also within the scope of protection, as will be stated in advance.

[0024] Please refer to Figures 1 to 5 The present invention shows a preferred embodiment of the present invention, wherein the pressure regulating valve 1 of the present invention includes a pipe body 10, a filter screen 20 and a valve assembly 30.

[0025] The pipe body 10 includes an air inlet 11, an exhaust outlet 12, and an internal space 13 communicating between the air inlet 11 and the exhaust outlet 12. A radial flange 14 protrudes inward from the inner circumferential surface of the pipe body 10, dividing the internal space 13 into a first portion 131 adjacent to the air inlet 11 and a second portion 132 adjacent to the exhaust outlet 12. The filter screen 20 is disposed in the first portion 131 at a distance from the radial flange 14. The valve assembly 30 includes a valve seat 31, a valve plug 32, a first elastic element 33, a piston tube 34, and a second elastic element 35. The valve seat 31 is disposed in the first portion 131 and located between the radial flange 14 and the filter screen 20. The valve seat 31 includes a body 311 and a sealing body 31. 2. The seat 311 and the sealing body 312 are integrally formed by encapsulation injection molding. The seat 311 is provided with a first flow channel 313, and the sealing body 312 is provided with a second flow channel 314 having a single radial dimension. The valve plug 32 is disposed on one side of the valve seat 31 corresponding to the second flow channel 314. The first elastic member 33 is a conical spring that springs against the valve plug 32 and the filter screen 20 to drive the valve plug 32 to normally block the second flow channel 314. The piston tube 34 is disposed in the second part 132 and moves relative to the valve seat 31 between a connecting position and a blocking position. The piston tube 34 passes through a third flow channel 341 corresponding to the second flow channel 314. The second elastic member 35 springs against the piston tube 34 and the radial flange 14.

[0026] The air inlet 11 is, for example, connected to a high-pressure air source, and the exhaust port 12 is, for example, connected to a pneumatic tool. A seal 40 is provided between the radial flange 14 and the piston tube 34 to prevent direct gas flow. When the piston tube 34 is in the connected position, the first flow channel 313 and the third flow channel 341 are connected, and gas can flow from the air inlet 11 through the first flow channel 313 and the third flow channel 341 towards the exhaust port 12. Figure 3 As shown. At this time, the gas pressure from the inlet 11 is greater than the gas pressure from the outlet 12. The piston tube 34 and the sealing body 312 maintain a distance, thus limiting the gas flow and achieving a flow restriction effect. When the piston tube 34 is pushed by the gas pressure from the outlet 12 and moves to the blocking position, the first flow channel 313 and the third flow channel 341 are not connected. The gas pressure drives the valve plug 32 to move away from the second flow channel 314 via the second flow channel 314, such as... Figure 4 As shown. At this time, the gas pressure from the exhaust port 12 overcomes the elastic force of the second elastic element 35, thereby driving the piston tube 34 to move and abut against the sealing body 312. This prevents the gas from the air inlet 11 from entering the third flow channel 341, and the gas pressure in the third flow channel 341 also cannot flow through the first flow channel 313. Instead, it flows to the second flow channel 314 and pushes against the valve plug 32 to release pressure. After the gas pressure at the exhaust end decreases, the first elastic element 33 and the second elastic element 35 respectively drive the piston tube 34 and the valve plug 32 to reset. This reciprocating action achieves a pressure stabilization effect, avoiding instability in the operation of pneumatic tools due to fluctuations in the air source, further extending the tool life and improving safety.

[0027] The valve seat 31 is movably disposed on the first portion 131 along one axial direction of the pipe body 10, and the valve seat 31 does not contact the filter screen 20. Therefore, when the piston tube 34 moves towards the blocking position and pushes against the valve seat 31, the valve seat 31 can move moderately to provide a buffering effect, preventing component displacement and damage. The elastic constant of the first elastic element 33 is smaller than that of the second elastic element 35, providing better sensitivity during pressure relief and a buffering effect when the valve seat 31 is under pressure. In this embodiment, the ratio of the cross-sectional area of ​​the third flow channel 341 to the cross-sectional area of ​​the second flow channel 314 is between 8 and 12. Through the matching design of the flow channel cross-sectional areas, the gas flow control accuracy can be optimized, resulting in a wider pressure stabilization range and faster response speed. For example, when the preset gas pressure entering the third flow channel 341 is 3 kgf / cm³, 2 In this case, the wire diameter of the second elastic element 35 can be 1.4 mm, the diameter of the third flow channel 341 can be 4.5 mm, and the diameter of the second flow channel 314 can be 1.5 mm; or, when the preset gas pressure entering the third flow channel 341 is 6.5 kgf / cm³, 2At this time, the wire diameter of the second elastic element 35 can be 1.6 mm, the diameter of the third flow channel 341 can be 6.5 mm, and the diameter of the second flow channel 314 can be 2 mm. They can be adjusted and matched separately, and other parameters such as spring material and spring coil can also be changed to achieve different air pressure control requirements.

[0028] The seat 311 and the seal 312 are made of different materials, and the hardness of the seat 311 is greater than that of the seal 312. This ensures structural strength, while the seal 312 provides better gas flow control. For example, the seat 311 is made of nylon, and the seal 312 is made of thermoplastic elastomer (TPE), nitrile rubber (NBR), or PPT plastic. In detail, the seat 311 includes a first ring portion 3111, a second ring portion 3112, and a plurality of support portions 3113 connected between the first ring portion 3111 and the second ring portion 3112. The second ring portion 3112 is located radially inside the first ring portion 3111 and surrounds a through hole 3114. The sealing body 312 passes through the through hole 3114 and includes a first abutting portion 3121 and a second abutting portion 3122. The second ring portion 3112 is sandwiched between the first abutting portion 3121 and the second abutting portion 3122 to ensure that the sealing body 312 can be stably attached to the seat 311 and is not easily deformed or displaced by force.

[0029] In this embodiment, the cross-sectional profile of the sealing body 312 is generally I-shaped; the outer diameter of the first abutment portion 3121 is larger than the outer diameter of the piston tube 34, and the first abutment portion 3121 can abut against the piston tube 34; the outer diameter of the second abutment portion 3122 is not smaller than the outer diameter of the valve plug 32, and the second abutment portion 3122 can abut against the valve plug 32, ensuring a sealing effect and preventing deformation. The second ring portion 3112 further includes at least one recess 3115, and the second abutment portion 3122 engages with the at least one recess 3115 and is flush with or protrudes from one end face of the second ring portion 3112, ensuring stable assembly and a sealing effect. The thickness of the second abutment portion 3122 is less than the thickness of the first abutment portion 3121, which can distribute the force as needed and provide a better sealing effect. The design of the seal 312 being integrally injection molded with the seat 311 can effectively improve assembly convenience and structural stability, prevent the seal 312 from shifting, and provide a good sealing effect when needed.

[0030] The pressure regulating valve 1 further includes a positioning ring 50 connected to the outer periphery of the filter screen 20. The width of the positioning ring 50 is greater than the thickness of the filter screen 20, and the first elastic member 33 is partially located within the positioning ring 50. More specifically, the positioning ring 50 has a C-shaped cross-section and includes a first edge 51 surrounding the first elastic member 33 and a second edge 52 opposite to the first edge 51. The radial dimension of the first edge 51 is greater than the radial dimension of the first elastic member 33, and the radial dimension of the second edge 52 is smaller than the radial dimension of the first elastic member 33. The height of the first edge 51 protruding from the filter screen 20 is greater than the wire diameter of the first elastic member 33, which effectively restricts the position of the first elastic member 33, preventing displacement or shaking, and ensuring the stability of the spring force direction, thereby maintaining the sensitivity and repeatability of the valve plug 32's operation.

[0031] The tube body 10 includes a tube body 15, a first connector 16, and a second connector 17. The first connector 16 and the second connector 17 are detachably screwed to opposite sides of the tube body 15. A radial flange 14 is provided on the tube body 15 and abuts against one end face of the first connector 16. The first connector 16 further includes an annular step portion 161, which, together with the radial flange 14, forms a first portion 131. A positioning ring 50 abuts against the annular step portion 161 in the axial direction. One end face of the second connector 17, together with the radial flange 14, forms a second portion 132. A pressure-bearing surface 342 of the piston tube 34 can abut against the second connector 17 in the axial direction, facilitating quick assembly, disassembly, and maintenance. A through hole 151 is radially provided in the tube body 15, which connects the second portion 132 to an external space to allow displacement of the piston tube 34. In this embodiment, the second connector 17 has an external thread section 171 for direct connection to a pneumatic tool or air hose. In other embodiments, the second connector 17a can also be a quick connector, with its valve core, spring, and other components accommodated between the tube body 15 and the second connector 17a. The second connector 17a can be integrally connected to the tube body 15, achieving a quick-release effect and good structural stability. Figure 6 As shown, this is to meet different usage needs.

[0032] The above description is a preferred embodiment of the present utility model and the technical principles applied thereto. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solution of the present utility model without departing from the spirit and scope of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A pressure regulating valve, characterized in that, include: A pipe body includes an air inlet, an exhaust outlet, and an internal space connecting the air inlet and the exhaust outlet. A radial flange protrudes inward from the inner circumferential surface of the pipe body, and the radial flange divides the internal space into a first part adjacent to the air inlet and a second part adjacent to the exhaust outlet. A filter screen, spaced apart from the radial flange, is disposed in the first portion; and A valve assembly includes a valve seat, a valve plug, a first elastic element, a piston tube, and a second elastic element. The valve seat is disposed in the first portion and located between the radial flange and the filter screen. The valve seat includes a body and a sealing body. The body and the sealing body are integrally formed by encapsulation injection molding. The body has a first flow channel, and the sealing body has a second flow channel with a single radial dimension. The valve plug is disposed on one side of the valve seat corresponding to the second flow channel. The first elastic element is a conical spring that springs against the valve plug and the filter screen to drive the valve plug to normally block the second flow channel. The piston tube is disposed in the second portion and is movable relative to the valve seat between a connecting position and a blocking position. The piston tube passes through a third flow channel corresponding to the second flow channel. The second elastic element springs against the piston tube and the radial flange. When the piston tube is in the connected position, the first flow channel is connected to the third flow channel, and gas can flow from the inlet to the outlet through the first flow channel and the third flow channel; when the piston tube is pushed by the gas pressure of the outlet and moves to the blocked position, the first flow channel and the third flow channel are not connected, and the gas pressure drives the valve plug to move away from the second flow channel through the second flow channel.

2. The pressure regulating valve as described in claim 1, characterized in that, It also includes a positioning ring connected to the outer periphery of the filter screen, wherein the width of the positioning ring is greater than the thickness of the filter screen, and the first elastic element is located in the positioning ring.

3. The pressure regulating valve as described in claim 2, characterized in that, The positioning ring has a C-shaped cross-section and includes a first edge surrounding the first elastic member and a second edge relative to the first edge. The radial dimension of the first edge is greater than the radial dimension of the first elastic member, and the radial dimension of the second edge is smaller than the radial dimension of the first elastic member.

4. The pressure regulating valve as described in claim 1, characterized in that, The base and the seal are made of different materials, and the hardness of the base is greater than that of the seal.

5. The pressure regulating valve as described in claim 1, characterized in that, The ratio of the cross-sectional area of ​​the third flow channel to the cross-sectional area of ​​the second flow channel is between 8 and 12.

6. The pressure regulating valve as described in claim 1, characterized in that, The valve seat is movably disposed in the first part along one axis of the pipe body, and the valve seat does not contact the filter screen.

7. The pressure regulating valve according to any one of claims 1 to 6, characterized in that, The seat includes a first ring portion, a second ring portion, and a plurality of support portions connected between the first ring portion and the second ring portion. The second ring portion is located radially inside the first ring portion and surrounds a through hole. The sealing body passes through the through hole and includes a first abutting portion and a second abutting portion. The second ring portion is sandwiched between the first abutting portion and the second abutting portion.

8. The pressure regulating valve as described in claim 7, characterized in that, The outer diameter of the first abutting part is larger than the outer diameter of the piston tube, and the first abutting part can abut against the piston tube; the outer diameter of the second abutting part is not smaller than the outer diameter of the valve plug, and the second abutting part can abut against the valve plug.

9. The pressure regulating valve as described in claim 7, characterized in that, The second ring portion further includes at least one recess, and the second abutting portion engages with the at least one recess and is flush with or protrudes from one end face of the second ring portion.

10. The pressure regulating valve as described in claim 3, characterized in that, The height of the first protrusion from the filter screen is greater than the wire diameter of the first elastic element; the seat and the sealing body are made of different materials, and the hardness of the seat is greater than that of the sealing body; the seat is made of nylon, and the sealing body is made of thermoplastic elastomer; the cross-sectional profile of the sealing body is generally I-shaped; the ratio of the cross-sectional area of ​​the third flow channel to the cross-sectional area of ​​the second flow channel is between 8 and 12; the valve seat is movably disposed in the first part along an axial direction of the pipe body, and the valve seat does not contact the filter screen; The seat includes a first ring portion, a second ring portion, and a plurality of support portions connected between the first ring portion and the second ring portion. The second ring portion is located radially inside the first ring portion and forms a through hole. The sealing body passes through the through hole and includes a first abutment portion and a second abutment portion. The second ring portion abuts against the first abutment portion and the second abutment portion. The outer diameter of the first abutment portion is larger than the outer diameter of the piston tube, and the first abutment portion can abut against the piston tube. The outer diameter of the second abutment portion is not smaller than... The valve plug has an outer diameter dimension, and the second abutment portion can abut against the valve plug; the second ring portion further includes at least one recess, and the second abutment portion engages with the at least one recess and is flush with or protrudes from one end face of the second ring portion; the thickness of the second abutment portion is less than the thickness of the first abutment portion; the tube body includes a tube body, a first connector and a second connector, the first connector and the second connector are detachably screwed to opposite sides of the tube body, and the radial flange is provided on the tube body and abuts against one end face of the first connector; the first connector The head also includes an annular step portion, which surrounds the first part with the radial flange, and the positioning ring abuts against the annular step portion in the axial direction; one end face of the second connector surrounds the second part with the radial flange, and a pressure-bearing surface of the piston tube abuts against the second connector in the axial direction; a sealing element is provided between the radial flange and the piston tube; a connecting hole is radially provided in the tube body, which connects the second part with an external space; and the elastic constant of the first elastic element is smaller than the elastic constant of the second elastic element.

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