Differential pressure adjustable self-operated differential pressure control valve

Abstract

The utility model discloses a pressure difference adjustable type self-operated pressure difference control valve which comprises a valve body and a connecting flange, an extension pipe is fixedly arranged at the upper end of the valve body, a mounting groove is formed in the bottom end of the inner wall of the extension pipe, a diaphragm is fixedly mounted in the mounting groove, an adjusting plate is arranged over the diaphragm, and the adjusting plate is connected with the valve body. Symmetrical mounting seats are fixedly mounted at the lower end of the adjusting plate and the upper end of the diaphragm, springs are mounted in the mounting seats, a push rod is vertically connected to the middle of a plate body of the adjusting plate, a threaded groove is formed in the lower end of the push rod and is in threaded connection with the adjusting plate, and a diaphragm cover is fixedly arranged at the upper end of the extension pipe. A sealing pipe is fixedly embedded in the middle of the upper end face of the membrane cover, filler is arranged in the sealing pipe, the push rod penetrates through the filler and extends upwards, and an adjusting block is fixedly arranged at the upper end of the push rod. Therefore, the pressure generated by the flowing of the medium in the valve body is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of a pressure differential adjustable self-operated pressure differential control valve, in particular to a pressure differential adjustable self-operated pressure differential control valve. Background Art

[0002] The self-operated differential pressure control valve does not require external energy and relies on the pressure change of the controlled medium to automatically adjust. It automatically eliminates the flow deviation caused by the residual pressure head and pressure fluctuation of the pipe network. It maintains a constant user inlet and outlet pressure difference, which helps to stabilize the system operation. It is particularly suitable for household metering or automatic control systems. The self-operated differential pressure control valve is divided into three types: water supply type, return type and bypass type. It is generally installed on the return pipe. The pressure guide pipe on the valve is connected to the water supply pipe. The water supply pipe installation type can also be selected, but they are not interchangeable. The bypass type self-operated differential pressure control valve is closed within the rated pressure differential range;

[0003] For example, a self-operated adjustable pressure differential control valve disclosed in the authorization announcement number CN218971922U includes a self-operated pressure differential control valve body, an inner cavity of the self-operated pressure differential control valve body is provided with a liquid inlet cavity, the upper end of the inner cavity of the liquid inlet cavity is movably connected with a pressure plate, the bottom of the pressure plate is fixedly connected with a spring, and the bottom of the spring is fixedly connected with a floating block. The device can change the squeezing distance of the floating block on the spring by adjusting the distance between the pressure plate and the liquid inlet cavity, thereby changing the force applied to the floating block to achieve a change in the flow rate of liquid entering the liquid outlet pipe. When the pressure at one end of the liquid outlet pipe is greater than the pressure at one end of the liquid inlet pipe, the device cannot be adjusted and the connecting rod moves up and down to drive the floating block to move up and down. No corresponding sealing structure is provided in the device, which may affect the overall sealing effect of the device. Utility Model Content

[0004] The purpose of the utility model is to provide a self-operated pressure differential control valve with adjustable pressure differential, so as to solve the problem that the device cannot be reversely adjusted and the connecting rod moves up and down to drive the floating block to move up and down, and no corresponding sealing structure is provided in the device, which may affect the overall sealing effect of the device.

[0005] The cam is fixedly provided with an adjusting screw mandrel and is secured on a flat plate with a top end and a bottom end of which is secured on a level track with respect to the control wheel.

[0006] Preferably, the adjustment plate is symmetrically provided with a clamping plate on the side, and the upper end of the extension tube is provided with a clamping groove matching the clamping plate, so that the adjustment plate is ensured to be stable when the push rod rotates and the adjustment plate is prevented from rotating.

[0007] Preferably, the regulating plate body is provided with a plurality of through holes for the flow medium to pass through, the push rod extends downward through the regulating plate and the lower end thereof does not contact the diaphragm, thereby preventing the push rod from contacting the valve stem and affecting the upward movement of the valve stem.

[0008] Preferably, connecting flanges are fixedly welded at both ends of the valve body, a valve cavity is formed inside the valve body, a pressure-guiding tube is provided at the upper end of the valve body, and the other end of the pressure-guiding tube extends into the interior of the membrane cover, passing the flowing medium into the membrane cover to provide pressure to the diaphragm from above.

[0009] Preferably, a valve seat is fixedly provided in the valve cavity, a through hole is opened in the valve seat, and a sealing ring is provided on the upper edge of the through hole to ensure the sealing effect when the valve core and the valve seat cooperate.

[0010] Preferably, a valve stem is fixedly mounted on the lower end of the diaphragm, and a valve core matching the through hole is fixedly mounted on the valve stem body, forming a diaphragm and valve core linkage structure, and the position of the valve core is changed by the up and down deformation of the diaphragm.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] By designing that the rotation of the adjusting block drives the push rod to rotate and screw it into the adjusting plate, the upper and lower positions of the adjusting plate are changed, thereby causing the spring to deform, thereby providing upward pulling force or downward pressure on the diaphragm, thereby limiting the movable distance of the valve stem and valve core, and realizing control of the medium flow through the through hole, thereby adapting to the pressure exerted on the diaphragm by the medium passing through the valve cavity. At the same time, the diaphragm is used to seal the valve body, and the sealing tube and packing are used to complete the sealing of the contact position between the push rod and the diaphragm cover to ensure the overall effect of the device. It is connected to the diaphragm cover through the pressure pipe. When the valve cavity pressure at one end of the outflowing medium is too large, the pressure exerted on the diaphragm from the top by the circulating medium can drive the diaphragm to sink downward, causing the valve stem and valve core to move downward, thereby sealing the through hole and adjusting the pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the valve body of the utility model;

[0015] Figure 3 This is a schematic diagram of the diaphragm structure of the utility model;

[0016] Figure 4 For this utility model Figure 4 A schematic diagram of the partially enlarged structure at center A;

[0017] Figure 5 This is a schematic diagram of the internal structure of the membrane cover of the utility model.

[0018] In the figure: 1. Valve body; 2. Connecting flange; 3. Valve chamber; 4. Valve seat; 5. Through hole; 6. Valve core; 7. Valve stem; 8. Extension tube; 9. Diaphragm cover; 10. Mounting groove; 11. Diaphragm; 12. Mounting seat; 13. Spring; 14. Adjusting plate; 15. Clamping plate; 16. Threaded groove; 17. Clamping groove; 18. Push rod; 19. Sealing tube; 20. Packing; 21. Adjusting block; 22. Pressure guiding tube. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] See also Figure 1-5The utility model provides a self-operated differential pressure control valve with adjustable pressure difference, including a valve body 1 and a connecting flange 2. An extension tube 8 is fixedly provided on the upper end of the valve body 1. A mounting groove 10 is provided on the bottom end of the inner wall of the extension tube 8. A diaphragm 11 is fixedly installed in the mounting groove 10. An adjusting plate 14 is provided just above the diaphragm 11. A symmetrical mounting seat 12 is fixedly installed on the lower end of the adjusting plate 14 and the upper end of the diaphragm 11. A spring 13 is installed in the mounting seat 12. A push rod 18 is vertically connected to the middle of the adjusting plate 14. A threaded groove 16 is provided on the lower end of the push rod 18. The threaded groove 16 is threadedly connected to the adjusting plate 14. A diaphragm cover 9 is fixedly provided on the upper end of the extension tube 8. The upper and lower ends of the diaphragm cover 9 are spliced ​​together. Synthetic sealing structure, a sealing tube 19 is fixedly embedded in the middle of the upper end surface of the membrane cover 9, a packing 20 is arranged inside the sealing tube 19, and the push rod 18 extends upward through the packing 20, and an adjustment block 21 is fixedly provided on the upper end of the push rod 18. A hexagonal hole is opened inside the adjustment block 21 to facilitate adjustment of various tool bodies. The adjustment plate 14 is symmetrically provided with a clamping plate 15 on the side, and a clamping groove 17 matching the clamping plate 15 is opened on the upper end of the extension tube 8. The clamping plate 15 cooperates with the clamping groove 17 to ensure that the adjustment plate 14 remains stable when the push rod 18 rotates. The adjustment plate 14 plate body is provided with a number of through holes for the flow medium to pass through. The push rod 18 extends downward through the adjustment plate 14 and the lower end does not contact the diaphragm 11;

[0021] When positioning the adjusting plate 14, the adjusting block 21 is rotated. The rotation of the adjusting block 21 drives the push rod 18 to rotate. The rotation of the push rod 18 causes the lower end thread groove 16 to screw into the adjusting plate 14, so that the adjusting plate 14 moves up and down along the push rod 18, so that the adjusting plate 14 pulls the spring 13 upward or squeezes the spring 13 downward, so that the spring 13 is stretched or compressed, and the diaphragm 11 is deformed accordingly. At the same time, the deformation of the diaphragm 11 causes the valve stem 7 and the valve core 6 to move up and down relative to the through hole 5, changing the gap between the valve core 6 and the through hole 5, thereby adjusting the passage amount of the flowing medium.

[0022] See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 , connecting flanges 2 are fixedly welded at both ends of the valve body 1, a valve cavity 3 is formed inside the valve body 1, a pressure guide tube 22 is provided at the upper end of the valve body 1, and the other end of the pressure guide tube 22 extends into the interior of the membrane cover 9, a valve seat 4 is fixedly provided in the valve cavity 3, the valve seat 4 is provided with a through hole 5, a sealing ring is provided at the upper edge of the through hole 5, a valve stem 7 is fixedly installed at the lower end of the diaphragm 11, and a valve core 6 matching the through hole 5 is fixedly installed on the valve stem 7;

[0023] Before using the device, the delivery pipeline is connected to the connecting flanges 2 at both ends of the valve body 1. When the flowing medium passes through the valve cavity 3, the pressure on the left side of the valve seat 4 increases, pushing the diaphragm 11 to deform upward, thereby pulling the valve stem 7 and the valve core 6 to move upward. When the valve core 6 moves upward, the through hole 5 can pass the flowing medium, so that the flowing medium flows to the other end, and then the flowing medium enters the membrane cover 9 through the pressure guiding tube 22. The flowing medium contacts the diaphragm 11 through the adjusting plate 14, and applies pressure to the diaphragm 11 from above the diaphragm 11, causing the diaphragm 11 to deform downward.

[0024] When using the embodiment of the present application:

[0025] The delivery pipe is connected to the connecting flanges 2 at both ends of the valve body 1, and the adjusting block 21 is rotated. The rotation of the adjusting block 21 drives the push rod 18 to rotate. The rotation of the push rod 18 makes the lower end thread groove 16 screwed with the adjusting plate 14, so that the adjusting plate 14 moves up and down along the push rod 18, so that the adjusting plate 14 pulls the spring 13 upward or presses the spring 13 downward, so that the spring 13 is stretched or compressed, and the diaphragm 11 is deformed accordingly. At the same time, the deformation of the diaphragm 11 makes the valve stem 7 and the valve core 6 move up and down relative to the through hole 5, changing the valve core 6 and the through hole. 5, thereby adjusting the flow rate of the flowing medium. When the flowing medium passes through the valve chamber 3, the pressure on the left side of the valve seat 4 increases, pushing the diaphragm 11 to deform upward, thereby pulling the valve stem 7 and the valve core 6 to move upward. When the valve core 6 moves upward, the flow medium can pass through the through hole 5, so that the flow medium flows to the other end, and then the flow medium enters the membrane cover 9 through the pressure guiding tube 22. The flow medium contacts the diaphragm 11 through the regulating plate 14, and applies pressure to the diaphragm 11 from above, causing the diaphragm 11 to deform downward.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-operated differential pressure control valve with adjustable differential pressure, comprising a valve body (1) and a connecting flange (2), characterized in that: An extension tube (8) is fixedly provided at the upper end of the valve body (1), a mounting groove (10) is provided at the bottom end of the inner wall of the extension tube (8), a diaphragm (11) is fixedly installed in the mounting groove (10), an adjustment plate (14) is provided just above the diaphragm (11), a symmetrical mounting seat (12) is fixedly provided at the lower end of the adjustment plate (14) and the upper end of the diaphragm (11), a spring (13) is installed in the mounting seat (12), and the middle part of the adjustment plate (14) is vertically connected to the diaphragm (11). A push rod (18) is connected, a thread groove (16) is provided at the lower end of the push rod (18), and the thread groove (16) is threadedly connected to the adjustment plate (14). A membrane cover (9) is fixedly provided at the upper end of the extension tube (8), and a sealing tube (19) is fixedly embedded in the middle of the upper end surface of the membrane cover (9). A filler (20) is provided inside the sealing tube (19), and the push rod (18) extends upward through the filler (20). An adjustment block (21) is fixedly provided at the upper end of the push rod (18).

2. The pressure differential adjustable self-operated pressure differential control valve according to claim 1, characterized in that: A clamping plate (15) is symmetrically arranged on the side of the adjustment plate (14), and a clamping groove (17) matching the clamping plate (15) is opened at the upper end of the extension tube (8).

3. The self-operated differential pressure control valve with adjustable differential pressure according to claim 1, characterized in that: The regulating plate (14) is provided with a plurality of through holes for the flow medium to pass through, and the push rod (18) passes through the regulating plate (14) and extends downward, with the lower end portion not in contact with the diaphragm (11).

4. The self-operated differential pressure control valve with adjustable differential pressure according to claim 1, characterized in that: Connecting flanges (2) are fixedly welded at both ends of the valve body (1), a valve cavity (3) is formed inside the valve body (1), a pressure guide tube (22) is provided at the upper end of the valve body (1), and the other end of the pressure guide tube (22) extends into the interior of the membrane cover (9).

5. The pressure differential adjustable self-operated pressure differential control valve according to claim 4, characterized in that: A valve seat (4) is fixedly arranged in the valve cavity (3), a through hole (5) is opened in the valve seat (4), and a sealing ring is arranged on the upper edge of the through hole (5).

6. The self-operated differential pressure control valve with adjustable differential pressure according to claim 1, characterized in that: A valve stem (7) is fixedly mounted on the lower end of the diaphragm (11), and a valve core (6) matching the through hole (5) is fixedly mounted on the body of the valve stem (7).

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