A diaphragm pressure reducing valve

Abstract

A diaphragm pressure reducing valve belongs to the technical field of pressure reducing valve equipment, and includes a pressure reducing valve body, a valve cover and a handle. An air inlet pipe is welded to one side of the pressure reducing valve body, and an air outlet pipe is welded to the other side of the pressure reducing valve body. A sealing structure is provided on the air inlet pipe. The valve cover is arranged at the top of the pressure reducing valve body, and mounting plates are installed on the contact surfaces between the pressure reducing valve body and the valve cover. The handle is arranged at the top of the valve cover. Convex blocks are connected to both sides of the guide rod, a limiting structure is arranged between the convex blocks and the inner wall of the valve cover, and a pressing column is arranged at the bottom end of the guide rod. A push column is arranged at the top of the pressure reducing valve body, a diaphragm is connected to the push column, a pressure spring is connected between the pressing column and the push column. A cavity is formed inside the pressure reducing valve body, a valve core is arranged at the bottom end of the cavity, a first ventilation hole is formed between the cavity and the air inlet pipe, and a second ventilation hole is formed between the cavity and the air outlet pipe. This valve body replaces the piston structure with a diaphragm structure, improving the adaptability of the valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure reducing valve equipment, and particularly relates to a diaphragm type pressure reducing valve. Background Art

[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 stability of the outlet pressure. 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 rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range. Most of the existing pressure valves are piston structures and require the use of lubricating oil. However, for oil-free compressors, it is obviously very inconvenient during use. Summary of the Invention

[0003] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a diaphragm type pressure reducing valve.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: A diaphragm type pressure reducing valve includes a pressure reducing valve body, a valve cover and a handle. An intake pipe is welded below one side of the pressure reducing valve body, and an outlet pipe is welded below the other side of the pressure reducing valve body. The intake pipe is provided with a sealing structure. The valve cover is arranged at the top of the pressure reducing valve body, and mounting plates are fixedly installed on the contact surfaces of the pressure reducing valve body and the valve cover. A fixing structure is arranged between the two mounting plates. The handle is arranged at the top of the valve cover. A handle groove is opened at the top of the valve cover. A guide rod is inserted into the handle groove. Convex blocks are connected to both sides of the guide rod. A limiting structure is arranged between the convex blocks and the inner wall of the valve cover. A buffer structure is arranged in the handle groove. The bottom end of the guide rod penetrates the bottom end of the handle groove and extends below the valve cover, and a pressing column is arranged at the bottom end of the guide rod. A pushing column is arranged at the top of the pressure reducing valve body. A diaphragm is fixedly connected to the pushing column, and the periphery of the diaphragm is connected to the inner wall of the pressure reducing valve body. A pressure spring is fixedly connected between the pressing column and the pushing column. A cavity is opened below the pushing column inside the pressure reducing valve body. A valve core is arranged at the bottom end of the cavity. A pressing column is arranged on the valve core. A first ventilation hole is opened between the cavity and the intake pipe, and a second ventilation hole is opened between the first ventilation hole and the outlet pipe.

[0005] Preferably, the sealing structure includes a first sealing ring and a second sealing ring. An internal thread is provided on the inner ring of the outer end of the intake pipe. A first step groove is provided around the intake pipe. The first sealing ring is sleeved on the first step groove. A second step groove is provided around the inner diameter opening of the outer ends of the intake pipe and the outlet pipe. The second sealing ring is sleeved on the second step groove.

[0006] Preferably, the fixing structure includes a third sealing ring. The third sealing ring is clamped between two mounting plates. Compression bolts are screwed on the periphery of the two mounting plates at equal intervals in a ring shape.

[0007] Preferably, the limiting structure includes a buffer washer. Limiting grooves are provided on both side walls of the guide rod. A second spring is fixedly connected in the limiting groove. The other end of the second spring is fixedly connected to a convex block. A plurality of equally spaced positioning holes are provided on the inner wall of the valve cover near the convex block in a vertical plane, and the height of the positioning hole is greater than the diameter of the top end of the convex block.

[0008] Preferably, the buffer structure includes a first spring. Four first springs are fixedly installed at the bottom end of the handle groove at equal intervals in a ring shape. The other end of the first spring is fixedly installed at the bottom end of the handle. The guide rod is located between the four first springs. A buffer washer is clamped between the bottom end of the handle groove and the guide rod.

[0009] Preferably, a first groove is provided at the top end of the pressure column. A head is fixedly installed at the bottom end of the guide rod, and the head abuts against the first groove.

[0010] Preferably, the push column is in the shape of a T-shaped platform column. The diaphragm is connected to the bottom end of the larger diameter ring at the top end of the push column. A pressure chamber is provided inside the pressure reducing valve body corresponding to the bottom end of the diaphragm.

[0011] Preferably, a third ventilation hole is provided between the pressure chamber and the outlet pipe, and the second ventilation hole is communicated with the third ventilation hole.

[0012] Preferably, the valve core is in the shape of a convex platform. A gland is clamped on the valve core. A second groove is provided at the top end of the valve core. A third spring is fixedly installed at the bottom end of the second groove, and the other end of the third spring is fixedly connected to the bottom end of the gland.

[0013] Preferably, a fourth sealing ring is clamped at the connection port between the bottom end of the valve core and the first ventilation hole.

[0014] The beneficial effects of the present invention are as follows: Through the setting of the sealing structure, the first sealing ring and the second sealing ring are respectively clamped on the first step groove and the second step groove, and then further fixed by the internal thread, improving the sealing performance of the air inlet pipe connection port and the valve. Moreover, a third sealing ring is clamped between the two mounting plates, a buffer washer is clamped between the guide rod and the handle groove, and a fourth sealing ring is clamped between the bottom end of the valve core and the first ventilation hole. Through multiple sealed connections, the overall sealing performance of the valve is further improved.

[0015] Through the setting of the limiting structure, the deformation of the second spring is utilized to make the convex block move in different positioning holes, so that the downward movement speed of the guide rod is more uniform, reducing the phenomenon that the diaphragm is damaged due to excessive local pressure caused by a large pressure between the diaphragms, and prolonging the service life of the diaphragm.

[0016] By pressing the pressure spring with the pressure column, the push column moves downward to squeeze the gland, thereby squeezing the valve core. Through layer-by-layer extrusion, the traditional piston structure is replaced, so that the valve does not require lubrication with lubricating oil, reducing the weight of the valve body and making it lighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of the sealing structure of the present invention;

[0019] Figure 3 is a schematic structural diagram of the fixing structure of the present invention;

[0020] Figure 4 is a schematic cross-sectional view of the valve cover of the present invention;

[0021] Figure 5 is a schematic structural diagram of the limiting structure of the present invention;

[0022] Figure 6 is a schematic structural diagram of the buffer structure of the present invention;

[0023] Figure 7 is a schematic cross-sectional view of the plane of the present invention;

[0024] Figure 8 is the present invention Figure 7 partial enlarged schematic view of part A in;

[0025] Figure 9 is the present invention Figure 7 partial enlarged schematic view of part B in;

[0026] Figure 10 is the present invention Figure 7 partial enlarged schematic view of part C in.

[0027] In the figure: 1, pressure reducing valve body; 2, valve cover; 3, handle; 4, intake pipe; 5, outlet pipe; 6, internal thread; 7, first stepped groove; 8, first sealing ring; 9, second stepped groove; 10, second sealing ring; 11, diaphragm; 12, cavity; 13, guide rod; 14, end head; 15, handle groove; 16, first spring; 17, buffer washer; 18, limit groove; 19, convex block; 20, positioning hole; 21, second spring; 22, valve core; 23, pressing column; 24, first groove; 25, third spring; 26, pressure spring; 27, push column; 28, pressure chamber; 29, third sealing ring; 30, compression bolt; 31, mounting plate; 32, first vent hole; 33, second vent hole; 34, third vent hole; 35, second groove; 36, fourth sealing ring; 37, gland. Specific embodiments

[0028] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0029] Embodiment: A diaphragm type pressure reducing valve, as Figures 1 - 10 shown, includes a pressure reducing valve body 1, a valve cover 2 and a handle 3. An intake pipe 4 is welded below one side of the pressure reducing valve body 1, and an outlet pipe 5 is welded below the other side of the pressure reducing valve body 1. Sealing structures are provided at the outer ports of the intake pipe 4. The valve cover 2 is arranged at the top of the pressure reducing valve body 1, and mounting plates 31 are fixedly installed on the contact surfaces between the pressure reducing valve body 1 and the valve cover 2. A fixing structure is arranged between the two mounting plates 31. The handle 3 is arranged at the top of the valve cover 2. A handle groove 15 is opened at the top of the valve cover 2. A guide rod 13 is inserted into the handle groove 15. Convex blocks 19 are connected to both sides of the guide rod 13. A limiting structure is arranged between the convex blocks 19 and the inner wall of the valve cover 2. A buffer structure is arranged in the handle groove 15. The bottom end of the guide rod 13 penetrates through the bottom end of the handle groove 15 and extends below the valve cover 2, and a pressing column 23 is arranged at the bottom end of the guide rod 13. A push column 27 is arranged at the top of the pressure reducing valve body 1. A diaphragm 11 is fixedly connected to the push column 27. The diaphragm 11 can use a structure with a curvature to improve the service life of the diaphragm 11, and the periphery of the diaphragm 11 is connected to the inner wall of the pressure reducing valve body 1. A pressure spring 26 is fixedly connected between the pressing column 23 and the push column 27. The end head 14 presses the push column 27, so that the push column 27 presses the pressing column 23 downward, and the pressing column 23 presses the pressure spring 26 to deform. A cavity 12 is opened inside the pressure reducing valve body 1 below the push column 27. A valve core 22 is arranged at the bottom end of the cavity 12. A pressing column 23 is arranged on the valve core 22. A first vent hole 32 is opened between the cavity 12 and the intake pipe 4, and a second vent hole 33 is opened between the first vent hole 32 and the outlet pipe 5. The pressure inside the valve is isolated from the external atmospheric pressure through the diaphragm 11.

[0030] The sealing structure includes a first sealing ring 8 and a second sealing ring 10. An internal thread 6 is provided on the inner circle of the outer end of the air inlet pipe 4. A first step groove 7 is provided on the outer end of the air inlet pipe 4 in a circular shape. The first sealing ring 8 is sleeved on the first step groove 7. A second step groove 9 is provided on the inner diameter of the outer ends of the air inlet pipe 4 and the air outlet pipe 5 in a circular shape. The second sealing ring 10 is sleeved on the second step groove 9. The setting of the first sealing ring 8 and the second sealing ring 10 makes the connection port of the air inlet pipe 4 more sealed.

[0031] The fixing structure includes a third sealing ring 29. The third sealing ring 29 is clamped between two mounting plates 31. Compression bolts 30 are screwed on the outer periphery of the two mounting plates 31 at equal intervals in a circular shape.

[0032] The limiting structure includes a buffer washer 17. Limiting grooves 18 are provided on both side walls of the guide rod 13. A second spring 21 is fixedly connected in the limiting groove 18. The other end of the second spring 21 is fixedly connected to a convex block 19. A plurality of equally spaced positioning holes 20 are provided on the inner wall of the valve cover 2 near the convex block 19 in a vertical plane. The height of the positioning hole 20 is greater than the diameter of the top end of the convex block 19. When the handle 3 presses down the guide rod 13, the bottom ends of the convex blocks 19 on both sides of the guide rod 13 are abutted against the inner wall of the valve cover 2 and retracted into the limiting groove 18. When the convex block 19 passes through the positioning hole 20, the convex block 19 falls into the positioning hole 20 through the rebound of the second spring 21. At this time, through the setting of the limiting structure, the guide rod 13 can move down slowly and evenly.

[0033] The buffer structure includes a first spring 16. Four first springs 16 are fixedly installed at the bottom end of the handle groove 15 at equal intervals in a circular shape. The other end of the first spring 16 is fixedly installed at the bottom end of the handle 3. The guide rod 13 is located between the four first springs 16. A buffer washer 17 is clamped between the bottom end of the handle groove 15 and the guide rod 13.

[0034] A first groove 24 is provided at the top end of the pressure column 23. A head 14 is fixedly installed at the bottom end of the guide rod 13, and the head 14 abuts against the first groove 24.

[0035] The push column 27 is in the shape of a T-shaped platform column. The diaphragm 11 is connected to the bottom end of the larger diameter ring at the top end of the push column 27. A pressure chamber 28 is provided inside the pressure reducing valve body 1 corresponding to the bottom end of the diaphragm 11.

[0036] A third ventilation hole 34 is provided between the pressure chamber 28 and the air outlet pipe 5, and the second ventilation hole 33 is communicated with the third ventilation hole 34. When the upward air pressure on the lower surface of the diaphragm 11 is large enough, the diaphragm 11 will move upward and lift. The air flow enters from the air inlet pipe 4 and is guided into the cavity 12 through the first ventilation hole 32. At this time, the valve core 22 moves upward under pressure, and the guide rod 13 moves upward synchronously. At this time, the entire valve body is in an open state.

[0037] The valve core 22 is in the shape of a boss. A gland 37 is clamped on the valve core 22. A second groove 35 is provided at the top end of the valve core 22. A third spring 25 is fixedly installed at the bottom end of the second groove 35, and the other end of the third spring 25 is fixedly connected to the bottom end of the gland 37.

[0038] A fourth sealing ring 36 is clamped at the connection port between the bottom end of the valve core 22 and the first vent hole 32.

[0039] Principle of the present invention: The pressure inside the valve is isolated from the external atmospheric pressure by the diaphragm 11. When the upward air pressure on the lower surface of the diaphragm 11 is large enough, the diaphragm 11 will move upward and push up. The air flow enters through the intake pipe 4 and is guided into the cavity 12 through the first vent hole 32. At this time, the valve core 22 moves upward under pressure, and the guide rod 13 moves upward synchronously. At this time, the entire valve body is in an open state; when the pressure on the lower surface of the diaphragm 11 is less than the pressure of the pressure spring 26, the handle 3 squeezes the guide rod 13 downward. The bottom ends of the protrusions 19 on both sides of the guide rod 13 abut against the inner wall of the valve cover 2 and contract into the limit groove 18. When the protrusions 19 pass through the positioning holes 20, the protrusions 19 fall into the positioning holes 20 by the rebound of the second spring 21. At this time, due to the setting of the limit structure of the guide rod 13, it can move downward slowly and evenly, preventing the end 14 at the bottom end of the guide rod 13 from squeezing the pressure column 23 too quickly, causing the diaphragm 11 to be suddenly heavily pressed and damaged. The end 14 presses the push column 27, so that the push column 27 squeezes the pressure column 23 downward. The pressure column 23 squeezes the pressure spring 26 to deform. At this time, by pressing the push column 27 to the top end of the pressure column 23, the valve core 22 is pressed downward by the pressure column 23. Through the layer-by-layer squeezing force, the pressure received by the diaphragm 11 can be made uniform. The downward pressure is also buffered by the first spring 16 in the buffer structure. The pressure spring 26 drives the diaphragm 11 to move downward, and finally the valve core 22 is tightly pressed against the bottom end of the cavity 12. At this time, the entire valve body is in a closed state. Sealing rings are provided at multiple connection ports of this valve body, improving the sealing performance of the valve body.

[0040] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A diaphragm pressure reducing valve, comprising a pressure reducing valve body (1), a valve cover (2) and a handle (3), characterized in that, On the lower side of one side of the pressure reducing valve body (1), an air inlet pipe (4) is welded. On the lower side of the other side of the pressure reducing valve body (1), an air outlet pipe (5) is welded. A sealing structure is arranged at the outer port of the air inlet pipe (4). The valve cover (2) is arranged at the top of the pressure reducing valve body (1), and mounting plates (31) are fixedly installed on the contact surfaces of the pressure reducing valve body (1) and the valve cover (2). A fixing structure is arranged between the two mounting plates (31). The handle (3) is arranged at the top of the valve cover (2). A handle groove (15) is opened at the top of the valve cover (2). A guide rod (13) is inserted into the handle groove (15). Convex blocks (19) are connected to both sides of the guide rod (13). A limiting structure is arranged between the convex blocks (19) and the inner wall of the valve cover (2). A buffer structure is arranged in the handle groove (15). The bottom end of the guide rod (13) penetrates through the bottom end of the handle groove (15) and extends below the valve cover (2), and a pressing column (23) is arranged at the bottom end of the guide rod (13). A push column (27) is arranged at the top of the pressure reducing valve body (1). A diaphragm (11) is fixedly connected to the push column (27), and the periphery of the diaphragm (11) is connected to the inner wall of the pressure reducing valve body (1). A pressure spring (26) is fixedly connected between the pressing column (23) and the push column (27). A cavity (12) is opened below the push column (27) inside the pressure reducing valve body (1). A valve core (22) is arranged at the bottom end of the cavity (12). A pressing column (23) is arranged on the valve core (22). A first ventilation hole (32) is opened between the cavity (12) and the air inlet pipe (4). A second ventilation hole (33) is opened between the first ventilation hole (32) and the air outlet pipe (5); The sealing structure includes a first sealing ring (8) and a second sealing ring (10). An internal thread (6) is opened in the inner ring of the outer end of the air inlet pipe (4). A first step groove (7) is opened in a circle at the outer end of the air inlet pipe (4). The first sealing ring (8) is sleeved on the first step groove (7). A second step groove (9) is opened in a circle at the inner diameter opening of the outer ends of the air inlet pipe (4) and the air outlet pipe (5). The second sealing ring (10) is sleeved on the second step groove (9); The buffer structure includes a first spring (16). Four first springs (16) are fixedly installed at equal intervals in a ring at the bottom end of the handle groove (15), and the other ends of the first springs (16) are fixedly installed at the bottom end of the handle (3). The guide rod (13) is located between the four first springs (16). A buffer washer (17) is clamped between the bottom end of the handle groove (15) and the guide rod (13).

2. The diaphragm type pressure reducing valve according to claim 1, characterized in that, The fixing structure includes a third sealing ring (29). The third sealing ring (29) is clamped between the two mounting plates (31). Compression bolts (30) are threadedly connected at equal intervals in a ring on the periphery of the two mounting plates (31).

3. A diaphragm pressure reducing valve according to claim 1, characterized in that, The limiting structure includes a buffer washer (17). Limiting grooves (18) are provided on both side walls of the guide rod (13). A second spring (21) is fixedly connected in the limiting groove (18). The other end of the second spring (21) is fixedly connected to a convex block (19). A plurality of equally spaced positioning holes (20) are provided in a vertical plane at a position on the inner wall of the valve cover (2) close to the convex block (19), and the height of the positioning hole (20) is greater than the diameter of the top end of the convex block (19).

4. A diaphragm type pressure reducing valve according to claim 1, characterized in that, A first groove (24) is provided at the top end of the pressing column (23). A head (14) is fixedly installed at the bottom end of the guide rod (13), and the head (14) abuts against the first groove (24).

5. A diaphragm type pressure reducing valve according to claim 1, characterized in that, The push column (27) is in the shape of a T-shaped platform column. The diaphragm (11) is connected to the bottom end of the larger-diameter ring at the top end of the push column (27). A pressure chamber (28) is provided inside the pressure reducing valve body (1) corresponding to the bottom end of the diaphragm (11).

6. The diaphragm type pressure reducing valve according to claim 5, characterized in that, A third vent hole (34) is provided between the pressure chamber (28) and the air outlet pipe (5), and the second vent hole (33) is communicated with the third vent hole (34).

7. A diaphragm type pressure reducing valve according to claim 1, characterized in that, The valve core (22) is in the shape of a boss. A gland (37) is clamped on the valve core (22). A second groove (35) is provided at the top end of the valve core (22). A third spring (25) is fixedly installed at the bottom end of the second groove (35), and the other end of the third spring (25) is fixedly connected to the bottom end of the gland (37).

8. A diaphragm type pressure reducing valve according to claim 1, characterized in that, A fourth sealing ring (36) is clamped at the connection port between the bottom end of the valve core (22) and the first vent hole (32).

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