Pressure reducing valve with double filtering structures

Abstract

A pressure reducing valve with a double filtering structure comprises a valve body, a connector arranged on the left side wall of the lower portion of the valve body and a pressure reducing groove in the valve body, a valve element is arranged in the pressure reducing groove, and a fixing hole is formed in the center of the inner wall of the right side of the connector. An air inlet seat matched with the fixing hole is screwed in the fixing hole; a caulking groove is formed in the center of the right end surface of the air inlet seat; a first filtering piece matched with the caulking groove is arranged in the caulking groove; a plurality of uniformly distributed first filtering holes are formed in the first filtering piece; a vent hole is formed in the center of the bottom of the caulking groove; the outer wall of the left end, located in the connector, of the air inlet base is provided with a plurality of air inlet holes communicated with the vent holes. The pressure reducing valve with the double-filtering structure has double filtering functions, even if one filtering function fails, the other filtering function can still filter impurities in gas, and the situation that the impurities enter the pressure reducing valve to cause abrasion and blockage of precise parts such as a valve element and a diaphragm is effectively avoided.

Description

Technical Field

[0001] This utility model relates to a pressure reducing valve, and more particularly to a pressure reducing valve with a dual filtration structure. Background Technology

[0002] Pressure reducing valves are used to reduce high-pressure gas to low-pressure gas and maintain stable outlet pressure and flow rate. They are used in equipment that requires gas supply, such as beer machines and soda machines.

[0003] Pressure regulating valves achieve pressure regulation through the dynamic balance of springs, diaphragms, and valve cores. However, during actual use, the flowing gas contains impurities. If these impurities are not filtered, they will come into contact with precision components such as the valve core and diaphragm during the pressure reduction process, easily leading to wear or blockage of these components. Therefore, to prevent this problem, a filter structure is installed at the bottom of the valve core. However, traditional pressure regulating valves are limited by their structure and can only have this one filter structure, making it impossible to install another filter structure in other parts. This results in an overly simplistic filter structure. Once damaged, the pressure regulating valve cannot filter impurities in the gas, and the risk of wear and blockage of precision components such as the valve core and diaphragm remains. Summary of the Invention

[0004] The present invention aims to solve the existing technical problem by providing a pressure reducing valve with a dual filtration structure. It has dual filtration, so even if one filtration fails, the other filtration can still filter impurities in the gas, effectively preventing impurities from entering the pressure reducing valve and causing wear and blockage of precision components such as valve core and diaphragm.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] This utility model discloses a pressure reducing valve with a dual filtration structure, including a valve body, an interface located on the lower left side wall of the valve body, and a pressure reducing groove inside the valve body. A valve core is disposed within the pressure reducing groove. A fixing hole is located at the center of the right inner wall of the interface. A matching air inlet seat is screwed into the fixing hole. A groove is located at the center of the right end face of the air inlet seat. A matching first filter element is disposed within the groove. The first filter element has several evenly distributed first filter holes. A vent hole is located at the center of the bottom of the groove. The air inlet seat is located at the interface. The valve body has several air inlets on its left outer wall that communicate with the vent holes; a second flow channel is provided on the right side of the valve body; a first flow channel communicating with the second flow channel is provided at the center of the bottom of the fixing hole; the upper end of the second flow channel communicates with the pressure reducing groove through a third flow channel; the valve core includes a valve core body, and a second filter element is provided at the lower end of the valve core body; the second filter element has several evenly distributed second filter holes; the upper part of the valve body has a pressure regulating hole, the upper end of the valve core body is located in the pressure regulating hole, and an air outlet connector communicating with the pressure regulating hole is provided on the front side wall of the valve body.

[0007] The outer edge of the inner wall on the right side of the interface is provided with an annular groove; a matching sealing sleeve is screwed into the interface; the inner wall of the right end of the sealing sleeve is provided with an annular pressure groove; the groove wall and the groove wall together form an annular sealing groove, and a matching sealing ring is provided in the sealing groove.

[0008] The diameter of the second filter hole is smaller than that of the first filter hole.

[0009] The lower end port of the second flow channel is located on the lower surface of the valve body, and a matching lower plug is screwed into the lower end port of the second flow channel; the right end port of the third flow channel is located on the outer right side wall of the valve body, and a matching side plug is screwed into the right end port of the third flow channel.

[0010] The valve core also includes a limiting hole located at the center of the lower end face of the valve core body, a second filter element located within the limiting hole, and a limiting flange formed by punching the outer edge of the lower end of the valve core body inward to fit against the lower surface of the second filter element; a matching valve core head is screwed into the upper end slot of the pressure reducing groove; a screw hole is located at the center of the lower end face of the valve core head; a pressure reducing hole communicating with the screw hole is located at the center of the upper end face of the valve core head, and the diameter of the pressure reducing hole is smaller than the diameter of the screw hole; the upper part of the valve core body is screwed into the screw hole, and a diaphragm is located between the upper end face of the valve core body and the bottom of the screw hole, with an opening and closing hole coaxial with the pressure reducing hole at the center of the diaphragm; The valve core body has a telescopic hole at the center of its upper end face that communicates with the limiting hole; a matching valve core rod is provided in the telescopic hole; a pressure-reducing spring is provided between the lower end face of the valve core rod and the upper surface of the second filter element; a sealing cone surface with a narrow upper end and a wide lower end is provided on the outer wall of the upper end of the valve core rod, which blocks and seals the lower end of the opening and closing hole; a central rod is provided at the center of the upper end face of the valve core rod, and the upper end of the central rod passes through the opening and closing hole and the pressure-reducing hole in sequence; a mounting hole is provided on the outer wall of the right side of the valve body, and the left end of the air outlet connector is screwed into the mounting hole; a fourth flow channel is provided on one side of the outer edge of the bottom of the pressure regulating hole, which communicates with the left end of the mounting hole.

[0011] A positioning hole is provided at the center of the upper surface of the valve body, and a pressure regulating hole is provided at the center of the bottom of the positioning hole; a matching positioning component is screwed into the positioning hole; a pressure hole is provided at the center of the positioning component; a matching pressure screw is screwed into the pressure hole; a pressure plate is provided in the upper part of the pressure regulating hole; an adjusting seat is provided in the lower part of the pressure regulating hole, located above the central rod; a groove is provided at the center of the upper surface of the adjusting seat; an adjusting spring is provided between the bottom of the groove and the lower surface of the pressure plate; when the pressure screw moves down along the threaded trajectory of the inner wall of the pressure hole, the lower end of the pressure screw can push the pressure plate downward; an auxiliary hole is provided on the outer wall of the valve body, communicating with the pressure regulating hole; the inner end of the auxiliary hole is located between the pressure plate and the adjusting seat.

[0012] The outer wall of the adjusting seat is provided with an annular groove; an O-ring that matches it is provided in the annular groove.

[0013] The upper end of the positioning hole has an annular end cap groove on its inner wall; a matching end cap is provided in the end cap groove.

[0014] The beneficial effects of this utility model are:

[0015] Compared with the prior art, the pressure reducing valve with a dual filtration structure of this utility model forms a first filtration when the gas enters the valve body, and a second filtration before the gas enters the valve core body. This not only effectively filters impurities in the gas, but also effectively prevents impurities from entering the valve core body and coming into contact with precision components such as the valve core rod and diaphragm, which could lead to wear or blockage. Furthermore, even if one filtration fails, the other filtration can still effectively filter impurities in the gas, ensuring that the pressure reducing effect can be achieved to the greatest extent. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the pressure reducing valve with a dual filtration structure according to this utility model from one angle.

[0017] Figure 2 yes Figure 1 An enlarged view of part A;

[0018] Figure 3 This is a cross-sectional view of the pressure reducing valve with a dual filtration structure according to this utility model from another angle;

[0019] Figure 4 This is a schematic diagram of the pressure reducing valve with a dual filtration structure according to this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] Please see Figures 1 to 4This utility model provides a pressure reducing valve with a dual filtration structure, including a valve body 1, an interface 2 located on the lower left side wall of the valve body 1, and a pressure reducing groove 3 inside the valve body 1. A valve core 4 is provided inside the pressure reducing groove 3. A fixing hole 5 is provided at the center of the right inner wall of the interface 2. A matching air inlet seat 6 is screwed into the fixing hole 5. A groove 7 is provided at the center of the right end face of the air inlet seat 6. A matching first filter element 8 is provided inside the groove 7. The first filter element 8 has several evenly distributed first filter holes 9. A vent hole 10 is provided at the center of the bottom of the groove 7. The outer left end of the air inlet seat 6 located inside the interface has several vent holes 10. An air inlet 11 is connected to the air vent 10; a second flow channel 12 is provided inside the right part of the valve body 1; a first flow channel 13 is provided at the center of the bottom of the fixing hole 5, which is connected to the second flow channel 12; the upper end of the second flow channel 12 is connected to the pressure reducing groove 3 through a third flow channel 14; the valve core 4 includes a valve core body 401, and a second filter element 402 is provided at the lower end of the valve core body 401; the second filter element 402 is provided with a plurality of evenly distributed second filter holes 403; a pressure regulating hole 15 is provided inside the upper part of the valve body 1, the upper end of the valve core body 401 is located inside the pressure regulating hole 15, and an air outlet connector 16 is provided on the front side wall of the valve body 1, which is connected to the pressure regulating hole 15.

[0022] The outer edge of the inner wall on the right side of the interface 2 is provided with an annular groove 17; a matching sealing sleeve 18 is screwed into the interface 2; the inner wall of the right end of the sealing sleeve 18 is provided with an annular pressure groove 19; the groove wall of the pressure groove 19 and the groove wall of the groove 17 form an annular sealing groove, and a matching sealing ring 21 is provided in the sealing groove.

[0023] The diameter of the second filter hole 403 is smaller than the diameter of the first filter hole 9.

[0024] The lower end port of the second flow channel 12 is located on the lower surface of the valve body 1, and a matching lower plug 22 is screwed into the lower end port of the second flow channel 12; the right end port of the third flow channel 14 is located on the outer right side wall of the valve body 1, and a matching side plug 23 is screwed into the right end port of the third flow channel 14.

[0025] The valve core 4 also includes a limiting hole 404 located at the center of the lower end face of the valve core body 401. The second filter element 402 is disposed within the limiting hole 404. The outer edge of the lower end of the valve core body 401 is punched inward to form a limiting flange 405 that fits against the lower surface of the second filter element 402. A matching valve core head 406 is screwed into the upper end slot of the pressure reducing groove 3. A screw hole 407 is located at the center of the lower end face of the valve core head 406. A pressure reducing hole 408 communicating with the screw hole 407 is located at the center of the upper end face of the valve core head 406. The diameter of the pressure reducing hole 408 is smaller than the diameter of the screw hole 407. The upper part of the valve core body 401 is screwed into the screw hole 407. A diaphragm 409 is disposed between the upper end face of the valve core body 401 and the bottom of the screw hole 407. An opening and closing hole 409 coaxial with the pressure reducing hole 408 is located at the center of the diaphragm 409. 10; The upper end face of the valve core body 401 is provided with a telescopic hole 411 that communicates with the limiting hole 404; The telescopic hole 411 is provided with a matching valve core rod 412; A pressure reducing spring 413 is provided between the lower end face of the valve core rod 412 and the upper surface of the second filter element 402; The upper end outer wall of the valve core rod 412 is provided with a sealing cone surface 414 that is narrower at the top and wider at the bottom, and the sealing cone surface 414 blocks and seals the lower end of the opening and closing hole 410; A central rod 415 is provided at the center of the upper end face of the valve core rod 412, and the upper end of the central rod 415 passes through the opening and closing hole 410 and the pressure reducing hole 408 in sequence; The right side outer wall of the valve body 1 is provided with a mounting hole 24, and the left end of the air outlet connector 16 is screwed into the mounting hole 24; A fourth flow channel 25 that communicates with the left end of the mounting hole 24 is provided on one side of the bottom outer edge of the pressure regulating hole 15.

[0026] A positioning hole 26 is provided at the center of the upper surface of the valve body 1, and a pressure regulating hole 15 is provided at the center of the bottom of the positioning hole 26. A matching positioning component 27 is screwed into the positioning hole 26. A pressure hole 28 is provided at the center of the positioning component 27. A matching pressure screw 29 is screwed into the pressure hole 28. A pressure plate 30 is provided in the upper part of the pressure regulating hole 15. An adjusting seat 31 located above the center rod 415 is provided in the lower part of the pressure regulating hole 15. A slot 32 is provided at the center of the upper surface of the adjusting seat 31. An adjusting spring 33 is provided between the bottom of the slot 32 and the lower surface of the pressure plate 30. When the pressure screw 29 moves down along the threaded trajectory of the inner wall of the pressure hole 28, the lower end of the pressure screw 29 can push the pressure plate 30 downward. An auxiliary hole 34 communicating with the pressure regulating hole 15 is provided on the outer wall of the valve body 1. The inner end of the auxiliary hole 34 is located between the pressure plate 30 and the adjusting seat 31.

[0027] The outer wall of the adjusting seat 31 is provided with an annular groove 35; an O-ring 36 matching it is provided in the annular groove 35.

[0028] The upper end of the positioning hole 26 has an annular end cap groove 37 on its inner wall; the end cap groove 37 is provided with a matching end cap 38.

[0029] The method of using this utility model is as follows:

[0030] The interface 2 on the valve body 1 can be installed on a beer machine. When pressure reduction is required, the gas in the beer machine will enter the vent 10 through the air inlet 11, and then enter the first flow channel 13 through the groove 7. When the gas flows through the groove 7, it can only flow through the first filter hole 9 on the first filter element 8. At this time, the first filter hole 9 on the first filter element 8 will trap impurities in the airflow on the left side of the first filter element 8 through its own aperture, thus filtering the gas. This ensures that the filtered gas flows into the pressure reducing groove 3 through the first flow channel 13, the second flow channel 12, and the third flow channel 14 in sequence. Then, it flows to the bottom of the valve core body 401 through the gap between the outer wall of the valve core body 401 and the inner wall of the pressure reducing groove 3, and then through the second filter hole 4 on the second filter element 402. 03 flows into the expansion hole 411 and through the gap between the outer wall of the valve core rod 412 and the inner wall of the expansion hole 411 to the diaphragm 409. When the lower end of the opening and closing hole 410 is blocked and sealed by the sealing cone surface 414, when the gas flows to the upper end of the expansion hole 411, the gas will push the sealing cone surface 414 downward, thereby realizing the downward movement of the valve core rod 412. At this time, the pressure reducing spring 413 is compressed and generates elastic force, which plays a buffering role. At the same time, the lower end of the opening and closing hole 410 is opened, and the gas can flow into the gas outlet connector 16 in sequence through the opening and closing hole 410, the pressure reducing hole 408, the pressure regulating hole 15, and the fourth flow channel 25. Finally, it is delivered outward through the gas outlet connector 16 or the pipeline connected to the gas outlet connector 16 to realize the release of gas pressure, thereby achieving the effect of pressure reduction.

[0031] In summary, the first filter element 8 of this utility model forms a first filtration at the moment the gas enters the valve body 1, and the second filter element 402 forms a second filtration before the gas enters the valve core body. This not only effectively filters impurities in the gas, but also effectively prevents impurities from entering the valve core body 401 and coming into contact with precision components such as the valve core rod 412 and the diaphragm 409, which could lead to wear or blockage. With the existence of two filters, even if one filter fails, the other filter can still effectively filter impurities in the gas, ensuring that the pressure reduction effect can be achieved normally to the greatest extent.

[0032] An annular groove 17 is provided on the outer edge of the inner wall on the right side of the interface 2. A matching sealing sleeve 18 is screwed into the interface 2. An annular pressure groove 19 is provided on the inner wall of the right end of the sealing sleeve 18. The groove wall of the pressure groove 19 and the groove wall of the groove 17 form an annular sealing groove. A matching sealing ring 21 is provided in the sealing groove. The presence of the sealing ring 21 can ensure the sealing of the connection between the valve body 1 and the beer machine after the valve body 1 is installed on the beer machine through the interface, and prevent air leakage.

[0033] The diameter of the second filter hole 403 is smaller than that of the first filter hole 9. In this case, the first filter hole 9 can filter large particulate impurities in the gas, while the second filter hole 403 can further filter smaller particulate impurities in the gas, thus minimizing the possibility of impurities entering the valve core body 401 and coming into contact with its internal precision components.

[0034] The lower end port of the second flow channel 12 is located on the lower surface of the valve body 1. A matching lower plug 22 is screwed into the lower end port of the second flow channel 12. The right end port of the third flow channel 14 is located on the outer right side wall of the valve body 1. A matching side plug 23 is screwed into the right end port of the third flow channel 14. This design facilitates the processing of the second flow channel 12 and the third flow channel 14.

[0035] When gas flows into the pressure regulating hole 15 through the pressure reducing hole, and flows to the outlet joint 16 through the fourth flow channel 25, the gas simultaneously pushes the regulating seat 31 upward. As the regulating seat 31 moves upward, the regulating spring 33 between the regulating seat 31 and the pressure plate 30 is compressed and generates elastic force. This elastic force can further reduce pressure. The initial state of the compressed regulating spring 33 determines its pressure reduction effect. The greater the degree of compression of the regulating spring 33, the greater the elastic force generated and the greater the pressure reduction effect. When it is necessary to compress the regulating spring 33, the end cover 38 can be opened, and then the pressure screw 29 can be rotated to move the pressure screw 29 downward, thereby pushing the pressure plate 30 downward, which can achieve the compression of the regulating spring 33.

[0036] The outer wall of the adjusting seat 31 is provided with an annular groove 35, and an O-ring 36 matching it is provided in the annular groove 35. The presence of the O-ring 36 can effectively ensure the sealing between the outer wall of the adjusting seat 31 and the inner wall of the pressure regulating hole 15. The friction between the rubber material of the O-ring 36 and the inner wall of the pressure regulating hole can make the adjusting seat 31 move up and down with a certain resistance. This resistance can further improve the pressure reduction effect. The auxiliary hole 34 can connect the space between the adjusting seat 31 and the pressure plate 30 with the outside world, ensuring the normal flow of air. Therefore, even if the space between the adjusting seat 31 and the pressure plate 30 is a sealed space, the adjusting seat 31 and the pressure plate 30 can still move up and down normally.

[0037] The upper end of the positioning hole 26 has an annular end cap groove 37 on its inner wall. The end cap 38 is provided in the end cap groove 37. The end cap 38 not only serves a decorative purpose, but also serves to protect the component.

Claims

1. A pressure reducing valve with a dual filtration structure, comprising a valve body, an interface disposed on the lower left side wall of the valve body, and a pressure reducing groove inside the valve body, wherein a valve core is disposed within the pressure reducing groove, characterized in that: A fixing hole is provided at the center of the inner wall on the right side of the interface; a matching air inlet seat is screwed into the fixing hole; a groove is provided at the center of the right end face of the air inlet seat; a matching first filter element is provided in the groove; the first filter element has several evenly distributed first filter holes; a vent hole is provided at the center of the bottom of the groove; several air inlets communicating with the vent holes are provided on the outer wall of the left end of the air inlet seat located inside the interface; a second flow channel is provided inside the right part of the valve body; a first flow channel communicating with the second flow channel is provided at the center of the bottom of the fixing hole; the upper end of the second flow channel communicates with the pressure reducing groove through a third flow channel; the valve core includes a valve core body, and a second filter element is provided at the lower end of the valve core body; a several evenly distributed second filter holes are provided on the second filter element; a pressure regulating hole is provided inside the upper part of the valve body, the upper end of the valve core body is located in the pressure regulating hole, and an air outlet connector communicating with the pressure regulating hole is provided on the front side wall of the valve body.

2. The pressure reducing valve with a dual filtration structure according to claim 1, characterized in that: The outer edge of the inner wall on the right side of the interface is provided with an annular groove; a matching sealing sleeve is screwed into the interface; the inner wall of the right end of the sealing sleeve is provided with an annular pressure groove; the groove wall and the groove wall together form an annular sealing groove, and a matching sealing ring is provided in the sealing groove.

3. A pressure reducing valve with a dual filtration structure according to claim 1, characterized in that: The diameter of the second filter hole is smaller than that of the first filter hole.

4. A pressure reducing valve with a dual filtration structure according to claim 1, characterized in that: The lower end port of the second flow channel is located on the lower surface of the valve body, and a matching lower plug is screwed into the lower end port of the second flow channel; the right end port of the third flow channel is located on the outer right side wall of the valve body, and a matching side plug is screwed into the right end port of the third flow channel.

5. A pressure reducing valve with a dual filtration structure according to claim 1, characterized in that: The valve core also includes a limiting hole located at the center of the lower end face of the valve core body, a second filter element located within the limiting hole, and a limiting flange formed by punching the outer edge of the lower end of the valve core body inward to fit against the lower surface of the second filter element; a matching valve core head is screwed into the upper end slot of the pressure reducing groove; a screw hole is located at the center of the lower end face of the valve core head; a pressure reducing hole communicating with the screw hole is located at the center of the upper end face of the valve core head, and the diameter of the pressure reducing hole is smaller than the diameter of the screw hole; the upper part of the valve core body is screwed into the screw hole, and a diaphragm is located between the upper end face of the valve core body and the bottom of the screw hole, with an opening and closing hole coaxial with the pressure reducing hole at the center of the diaphragm; The valve core body has a telescopic hole at the center of its upper end face that communicates with the limiting hole; a matching valve core rod is provided in the telescopic hole; a pressure-reducing spring is provided between the lower end face of the valve core rod and the upper surface of the second filter element; a sealing cone surface with a narrow upper end and a wide lower end is provided on the outer wall of the upper end of the valve core rod, which blocks and seals the lower end of the opening and closing hole; a central rod is provided at the center of the upper end face of the valve core rod, and the upper end of the central rod passes through the opening and closing hole and the pressure-reducing hole in sequence; a mounting hole is provided on the outer wall of the right side of the valve body, and the left end of the air outlet connector is screwed into the mounting hole; a fourth flow channel is provided on one side of the outer edge of the bottom of the pressure regulating hole, which communicates with the left end of the mounting hole.

6. A pressure reducing valve with a dual filtration structure according to claim 5, characterized in that: A positioning hole is provided at the center of the upper surface of the valve body, and a pressure regulating hole is provided at the center of the bottom of the positioning hole; a matching positioning component is screwed into the positioning hole; a pressure hole is provided at the center of the positioning component; a matching pressure screw is screwed into the pressure hole; a pressure plate is provided in the upper part of the pressure regulating hole; an adjusting seat is provided in the lower part of the pressure regulating hole, located above the central rod; a groove is provided at the center of the upper surface of the adjusting seat; an adjusting spring is provided between the bottom of the groove and the lower surface of the pressure plate; when the pressure screw moves down along the threaded trajectory of the inner wall of the pressure hole, the lower end of the pressure screw can push the pressure plate downward; an auxiliary hole is provided on the outer wall of the valve body, communicating with the pressure regulating hole; the inner end of the auxiliary hole is located between the pressure plate and the adjusting seat.

7. A pressure reducing valve with a dual filtration structure according to claim 6, characterized in that: The outer wall of the adjusting seat is provided with an annular groove; an O-ring that matches it is provided in the annular groove.

8. A pressure reducing valve with a dual filtration structure according to claim 6, characterized in that: The upper end of the positioning hole has an annular end cap groove on its inner wall; a matching end cap is provided in the end cap groove.

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