High-precision medical gas pressure reducing valve

Abstract

The application relates to the field of gas pressure reducing valves, and discloses a high-precision medical gas pressure reducing valve to solve the problem that the sensitivity of a pressure regulating valve changes after the front-rear pressure difference changes. The high-precision medical gas pressure reducing valve comprises a pressure reducing valve body, a pressure reducing valve cover, a valve rod, a diaphragm, and a valve seat, an adjusting flow channel is formed between the valve rod and the valve seat, an air inlet cavity is arranged below the valve seat, an air outlet cavity is arranged above the valve seat, the diaphragm is fixedly connected with the valve rod, a pressure regulating assembly is arranged above the diaphragm, the movement of the diaphragm and the valve rod is controlled through the pressure regulating assembly, and the pressure of the air outlet cavity is adjusted. The movement of the diaphragm and the valve rod is controlled through the adjusting assembly, the pressure of the air outlet cavity is accurately adjusted, the elastic modulus of the first spring is matched with the pressure regulating range and is used for accurate adjustment, the elastic modulus of the second spring is matched with the possible pressure difference and is used for coping with pressure fluctuation, and the pressure regulating precision is further improved.

Description

Technical Field

[0001] This invention relates to the field of gas pressure reducing valves, and more particularly to a high-precision medical gas pressure reducing valve. Background Technology

[0002] A gas pressure regulating valve is a device used to adjust and control the pressure of gas fluids. Its main function is to reduce the high pressure of the input gas (upstream pressure) to a set stable pressure (downstream pressure) to adapt to different application scenarios and equipment requirements. Gas pressure regulating valves are widely used in many industries. Through the coordinated action of elastic elements (such as springs, diaphragms, etc.) and the valve core, the valve automatically regulates pressure fluctuations to maintain a stable downstream pressure.

[0003] However, when the pressure regulating valve faces a large pressure differential, the valve core needs to be adjusted more precisely to maintain a stable downstream pressure. At this time, the valve core's response to pressure changes may become more sensitive, affecting the accuracy of pressure control. In addition, under high pressure differential conditions, the structure and materials of the pressure regulating valve need to withstand greater stress, which may lead to component wear or damage, thus affecting the accuracy of the pressure regulating valve. When the pressure regulating valve faces a small pressure differential, the adjustment range of the valve core is relatively small, which may limit the accuracy of the pressure regulating valve. Under low pressure differential conditions, the valve core's response to pressure changes may become less sensitive, leading to a decrease in the accuracy of the pressure regulating valve. Furthermore, low pressure differentials may result in a smaller flow rate, which limits the regulating capacity of the pressure regulating valve. Summary of the Invention

[0004] The purpose of this invention is to balance the changes in regulation sensitivity caused by pressure difference changes, thereby reducing excessive pressure fluctuations in the rear and improving the pressure regulation effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-precision medical gas pressure reducing valve includes a pressure reducing valve body, a pressure reducing valve cover, a valve stem, a diaphragm, and a valve seat. An adjusting flow channel is formed between the valve stem and the valve seat. An inlet chamber is located below the valve seat, and an outlet chamber is located above the valve seat. The diaphragm is fixedly connected to the valve stem, and a pressure regulating assembly is located above the diaphragm. The pressure regulating assembly controls the movement of the diaphragm and the valve stem to adjust the pressure in the outlet chamber. The pressure regulating assembly includes an adjusting screw, the end of which extends into the pressure reducing valve cover and is fixedly connected to a spring seat. A first spring is fixed below the spring seat, and the end of the first spring is fixedly connected to the diaphragm. The adjusting screw has a hollow cavity, and a slide tube is slidably connected inside the hollow cavity. A reversing wheel is installed on the top of the hollow cavity, and a pull rope is fixed to the top of the slide tube. After the pull rope is reversed by the reversing wheel, it is connected to a counterweight. The counterweight enters the slide tube vertically. A sealing ring is provided on the upper part of the slide tube, and a fixed seat is connected to the lower end of the slide tube. A second spring is fixed below the fixed seat. The slide tube and the sealing ring divide the hollow cavity into an upper cavity and a lower cavity. The upper cavity is connected to the air inlet connector through a pipe, and the lower cavity is connected to the air outlet connector through a pipe.

[0007] As a further improvement to the above scheme,

[0008] Preferably, the pressure reducing valve body, valve seat, sealing seat, and valve stem form an air inlet chamber, which is connected to the air inlet connector; the pressure reducing valve body, diaphragm, valve seat, and valve stem form an air outlet chamber, which is connected to the air outlet connector.

[0009] Preferably, the diaphragm is fixed between the pressure reducing valve body and the pressure reducing valve cover. The diaphragm is fixed to the fixed end by an upper pressure plate, a lower pressure plate and a tightening block. The fixed end is detachably fixed to the upper end of the valve stem.

[0010] Preferably, a high-pressure sealing element, a limiting block, and a retaining ring are arranged sequentially from top to bottom between the pressure reducing valve body and the valve stem. A limiting plate and a tightening block are also provided at the lower end of the retaining ring. The limiting plate and the tightening block are fixed on the valve stem.

[0011] Preferably, an annular gap with a variable opening is formed between the valve stem, the valve seat, and the sealing seat, wherein the upper end of the annular gap is circular and the lower end is flared.

[0012] Preferably, the pressure reducing valve body is provided with an upper limiting member and a lower limiting member, and the valve stem moves up and down within the range of the upper limiting member and the lower limiting member.

[0013] Preferably, the elastic modulus of the first spring is adapted to the pressure adjustment range.

[0014] Preferably, the elastic modulus of the second spring is adapted to the pressure difference that may occur within the pressure adjustment range.

[0015] The beneficial effects of this invention are:

[0016] The pressure in the outlet chamber is precisely adjusted by controlling the movement of the diaphragm and valve stem through the adjustment components. The elastic modulus of the first spring is adapted to the pressure adjustment range for precise adjustment; the elastic modulus of the second spring is adapted to the possible pressure difference to cope with pressure fluctuations, further improving the pressure adjustment accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] In the diagram: 1. Adjusting screw; 2. Reversing wheel; 3. Upper cavity; 4. Pull rope; 5. Counterweight; 6. Slide tube; 7. Lower cavity; 8. Pressure reducing valve cover; 9. Spring seat; 10. First spring; 11. Fixed seat; 12. Second spring; 13. Diaphragm; 14. Upper pressure plate; 15. Lower pressure plate; 16. Air outlet connector; 17. Air outlet chamber; 18. Valve seat; 19. Sealing seat; 20. Pressure reducing valve body; 21. High-pressure seal; 22. Retaining ring; 23. Limiting block; 24. Air inlet chamber; 25. Valve stem. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example

[0021] A high-precision medical gas pressure reducing valve includes a pressure reducing valve body 20, a pressure reducing valve cover 8, a valve stem 25, a diaphragm 13, and a valve seat 18. A regulating flow channel is formed between the valve stem 25 and the valve seat 18. An inlet chamber 24 is located below the valve seat 18, and an outlet chamber 17 is located above the valve seat 18. The diaphragm 13 is fixedly connected to the valve stem 25, and a pressure regulating component is located above the diaphragm 13. The pressure regulating component controls the movement of the diaphragm 13 and the valve stem 25 to regulate the pressure in the outlet chamber 17. The pressure reducing valve body 20... The valve seat 18, the sealing seat 19, and the valve stem 25 form an air inlet chamber 24, which is connected to the air inlet connector. The pressure reducing valve body 20, the diaphragm 13, the valve seat 18, and the valve stem 25 form an air outlet chamber 17, which is connected to the air outlet connector 16. The diaphragm 13 is fixed between the pressure reducing valve body 20 and the pressure reducing valve cover 8. The diaphragm 13 is fixed to the fixed end by the upper pressure plate 14, the lower pressure plate 15, and the tightening block. The fixed end is detachably fixedly connected to the upper end of the valve stem 25.

[0022] A high-pressure sealing element 21, a limiting block 23, and a retaining ring 22 are arranged sequentially from top to bottom between the pressure reducing valve body 20 and the valve stem 25. A limiting plate and a tightening block are also provided at the lower end of the retaining ring 22. The limiting plate and the tightening block are fixed on the valve stem 25. An annular gap with variable opening is formed between the valve stem 25, the valve seat 18, and the sealing seat 19. The upper end of the annular gap is circular and the lower end is flared. An upper limiting element and a lower limiting element are provided inside the pressure reducing valve body 20. The valve stem 25 moves up and down within the range of the upper limiting element and the lower limiting element.

[0023] The pressure regulating assembly includes an adjusting screw 1, the end of which extends into the pressure reducing valve cover 8 and is fixedly connected to the upper spring seat 9. A first spring 10 is fixed below the upper spring seat 9, and the end of the first spring 10 is fixedly connected to the diaphragm 13. The adjusting screw 1 has a hollow cavity, and a slide tube 6 is slidably connected inside the hollow cavity. A reversing wheel 2 is installed on the top of the hollow cavity, and a pull rope 4 is fixed on the top of the slide tube 6. After the pull rope 4 is reversed by the reversing wheel 2, it is connected to a counterweight 5, which enters the slide tube vertically. Inside the slide tube 6, a sealing ring is provided at the upper part of the slide tube 6, and a fixed seat 11 is connected to the lower end of the slide tube 6. A second spring 12 is fixed below the fixed seat 11. The elastic modulus of the first spring 10 is adapted to the pressure adjustment range, and the elastic modulus of the second spring 12 is adapted to the pressure difference that may occur in the pressure adjustment range. The slide tube 6 and the sealing ring divide the hollow cavity into an upper cavity 3 and a lower cavity 7. The upper cavity 3 is connected to the air inlet connector through a pipe, and the lower cavity 7 is connected to the air outlet connector 16 through a pipe.

[0024] The working principle of this application is as follows:

[0025] When gas enters the intake chamber 24 from the intake connector, the gas will pass through the annular gap formed between the valve seat 18 and the valve stem 25. Before passing through the annular gap, the gas is in a high pressure state. After passing through the annular gap, the high pressure gas will play a role in reducing pressure.

[0026] The pressure regulating assembly includes an adjusting screw 1, a reversing wheel 2, a pull rope 4, and a counterweight 5. The counterweight 5 is adapted to the weight of the slide tube 6 and the second spring 12. By adjusting the rotation of the adjusting screw 1, the compression degree of the first spring 10 is changed, thereby adjusting the stress required for the diaphragm 13 to move upward, so as to match the pressure regulating range.

[0027] The movement of valve stem 25 changes the opening of the annular gap, thereby affecting the flow rate of gas. The pressure in outlet chamber 17 acts on diaphragm 13, changing the position of diaphragm 13. After the position of diaphragm 13 changes, it will drive valve stem 25 to move. When the pressure in outlet chamber 17 increases, the opening of the annular gap decreases, thereby adaptively adjusting the pressure and keeping the pressure in the subsequent gas chambers balanced.

[0028] Furthermore, the dual-spring design makes the pressure reducing valve more precise and stable. The elastic modulus of the first spring 10 is adapted to the pressure adjustment range for precise adjustment; the elastic modulus of the second spring 12 is adapted to the possible pressure difference to cope with pressure fluctuations and pressure difference compensation is performed through the second spring 12.

[0029] When the pressure difference between the front and rear is large, the slide tube 6 will move downward, and the second spring 12 will press on the diaphragm 13. The elastic force of the second spring 12 will resist the upward deformation of the diaphragm 13. Therefore, under the same force, the upward displacement of the diaphragm 13 will be reduced accordingly, so as to avoid the pressure fluctuation at the rear caused by the large displacement when the pressure difference is too large.

[0030] When the pressure difference is small, the force exerted by the pressure difference on the slide tube 6 is small, and the force exerted by the second spring 12 on the diaphragm 13 is small. Therefore, when the same force is applied to the diaphragm 13, the upward displacement of the diaphragm 13 will increase, thus improving the sensitivity of the diaphragm 13 when the pressure difference is small.

[0031] The movement of the diaphragm 13 and valve stem 25 is controlled by the adjustment component to achieve precise adjustment of the pressure in the outlet chamber 17. The elastic modulus of the first spring 10 is adapted to the pressure adjustment range for precise adjustment; the elastic modulus of the second spring 12 is adapted to the possible pressure difference to cope with pressure fluctuations, further improving the pressure adjustment accuracy.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-precision medical gas pressure reducing valve, comprising a pressure reducing valve body (20), a pressure reducing valve cover (8), a valve stem (25), a diaphragm (13), and a valve seat (18), wherein an adjusting flow channel is formed between the valve stem (25) and the valve seat (18), an air inlet chamber (24) is provided below the valve seat (18), and an air outlet chamber (17) is provided above the valve seat (18), the diaphragm (13) is fixedly connected to the valve stem (25), and a pressure regulating component is provided above the diaphragm (13), thereby regulating the pressure of the air outlet chamber (17) by controlling the movement of the diaphragm (13) and the valve stem (25) through the pressure regulating component; characterized in that The pressure regulating assembly includes an adjusting screw (1), the end of which extends into the pressure reducing valve cover (8) and is fixedly connected to the upper spring seat (9). A first spring (10) is fixed below the upper spring seat (9), and the end of the first spring (10) is fixedly connected to the diaphragm (13). The adjusting screw (1) has a hollow cavity, and a slide tube (6) is slidably connected inside the hollow cavity. A reversing wheel (2) is installed on the top of the hollow cavity, and a pull rope (4) is fixed on the top of the slide tube (6). The pull rope (4) is connected to a counterweight (5) after being reversed by the reversing wheel (2). The counterweight (5) enters vertically into the slide tube (6). The upper part of the slide tube (6) is provided with a sealing ring. The lower end of the slide tube (6) is connected to a fixed seat (11). A second spring (12) is fixed below the fixed seat (11). The slide tube (6) and the sealing ring divide the hollow cavity into an upper cavity (3) and a lower cavity (7). The upper cavity (3) is connected to the air inlet connector through a pipe. The lower cavity (7) is connected to the air outlet connector (16) through a pipe. The elastic modulus of the second spring (12) is adapted to the pressure difference that may occur in the pressure adjustment range, and is used to cope with pressure fluctuations.

2. The high-precision medical gas pressure reducing valve according to claim 1, characterized in that, The pressure reducing valve body (20), valve seat (18), sealing seat (19) and valve stem (25) form an air inlet chamber (24), which is connected to the air inlet connector. The pressure reducing valve body (20), diaphragm (13), valve seat (18) and valve stem (25) form an air outlet chamber (17), which is connected to the air outlet connector (16).

3. The high-precision medical gas pressure reducing valve according to claim 2, characterized in that, The diaphragm (13) is fixed between the pressure reducing valve body (20) and the pressure reducing valve cover (8). The diaphragm (13) is fixed to the fixed end by the upper pressure plate (14), the lower pressure plate (15) and the tightening block. The fixed end is detachably fixed to the upper end of the valve stem (25).

4. The high-precision medical gas pressure reducing valve according to claim 3, characterized in that, The pressure reducing valve body (20) and valve stem (25) are provided with a high pressure sealing element (21), a limiting block (23) and a retaining ring (22) from top to bottom. The lower end of the retaining ring (22) is also provided with a limiting plate and a tightening block. The limiting plate and the tightening block are fixed on the valve stem (25).

5. The high-precision medical gas pressure reducing valve according to claim 1, characterized in that, A variable-opening annular gap is formed between the valve stem (25), the valve seat (18), and the sealing seat (19). The upper end of the annular gap is circular and the lower end is flared.

6. The high-precision medical gas pressure reducing valve according to claim 5, characterized in that, The pressure reducing valve body (20) is provided with an upper limiting member and a lower limiting member, and the valve stem (25) moves up and down within the range of the upper limiting member and the lower limiting member.

Images