Differential pressure bypass valve

Abstract

The utility model provides a differential pressure bypass valve, and belongs to the technical field of valves. The problem that the structure is complex is solved. An inlet is formed in the bottom of the valve body, an outlet is formed in the side portion of the valve body, a valve hole for communicating the inlet with the outlet is formed in the valve body, a spring seat, a spring and a valve element are sequentially arranged in the valve body from top to bottom, the lower end of the valve element abuts against an upper end hole opening of the valve hole, and a pressure adjusting cover is sleeved outside the top of the valve body and is in threaded connection with the valve body. An annular blocking piece is fixedly connected into the top of the valve body, the pressure adjusting cover is provided with a connecting column protruding out of the top wall of the inner side of the pressure adjusting cover, the connecting column penetrates through the blocking piece and abuts against the spring seat, the connecting column is provided with an inner hole formed in the vertical direction in a penetrating mode, a connecting screw is arranged in the inner hole, and an annular part protruding out of the hole wall of the inner hole is arranged in the inner hole of the connecting column. The rod portion of the connecting screw penetrates through the center hole of the circular ring portion, and the head portion of the connecting screw abuts against the upper side face of the circular ring portion. The device has the advantages of simple structure, reliable use and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a differential pressure bypass valve. Background Art

[0002] A differential pressure bypass valve is a valve device that does not require any external power and can maintain a relatively constant pressure at both ends of the valve relying on the pressure of the pipe network itself, which can effectively prevent equipment from being damaged. For example, the differential pressure bypass valve disclosed in Patent Application No. 201821671145.4 includes a valve body and a valve core. A valve seat is horizontally arranged in the inner cavity of the valve body. The inlet cavity in the valve cavity communicates with the through hole of the valve seat from the lower end, and the outlet cavity communicates with the through hole of the valve seat from the upper end. The valve core is located in the valve cavity. Above the valve seat, there is a valve core sealing surface that cooperates with the sealing surface of the valve seat. An adjusting spring is also arranged in the valve cavity of the valve body. The adjusting spring is a pre-compressed spring. The lower end of the adjusting spring is connected to the valve core, and the upper end of the adjusting spring is connected to the valve body. Under normal supply pressure, the valve core contacts and seals with the valve seat under the action of the adjusting spring, and the differential pressure bypass valve is in a closed state; when the supply end pressure increases to a certain extent or the use end pressure drops to a certain extent, the pressure difference on both sides of the valve core of the differential pressure bypass valve exceeds the elastic force of the adjusting spring, and the valve core moves upward to open the differential pressure bypass valve, so that part of the medium flows back to the supply end through the bypass, and the flow rate and pressure directly flowing to the use end basically remain unchanged. When the supply pressure returns to normal, the pressure on both sides of the valve core of the differential pressure bypass valve also returns to normal, and the valve core contacts and seals with the valve seat again under the action of the elastic force of the adjusting spring.

[0003] To meet the usage requirements under different working conditions, it is required that the elastic force of the adjusting spring can be adjusted. For this purpose, the above-mentioned differential pressure bypass valve is connected with a vertical extension cylinder at the top of the valve body. A spring limit member is provided at the top of the extension cylinder. The upper end of the adjusting spring abuts against the bottom surface of the spring limit member. The spring limit member is threadedly connected with the extension cylinder. A cup-shaped handle is provided at the top of the extension cylinder. The handle is sleeved on the outside of the top of the extension cylinder and is in clearance fit with the extension cylinder. A horizontal annular mounting groove is provided on the outer surface of the extension cylinder. A horizontal annular protrusion is provided on the inner surface of the cup wall of the handle. The horizontal annular protrusion is inserted into the horizontal annular mounting groove and is in sliding fit with the horizontal annular mounting groove. The spring limit member is tubular with a bottom and is located inside the extension cylinder. The outer side surface of the spring limit member is in clearance fit with the inner wall of the extension cylinder. A vertical chute is provided on the inner side surface of the extension cylinder. A slider extending into the vertical chute is provided on the outer side surface of the spring limit member. A regulating column extending downward is provided at the center of the bottom of the cup of the handle. The regulating column is provided with an external thread. The spring limit member is screwed onto the regulating column through its internal thread. Thus, an indirect screw connection between the spring limit member and the extension cylinder through the handle is realized. When it is necessary to adjust the elastic force of the adjusting spring, only the handle needs to be rotated. The handle and the extension cylinder are fixedly connected vertically. The spring limit member is threadedly connected with the handle and the spring limit member is also circumferentially fixed with the extension cylinder. In this way, when the handle rotates, the spring limit member will be driven by the thread to move vertically to release or further compress the adjusting spring.

[0004] However, in the process of the rotation of the handle finally being converted into the up and down movement of the spring limit member, it involves the axial limit structure of the handle and the extension cylinder with the cooperation of the horizontal annular protrusion and the horizontal annular mounting groove, the circumferential limit structure of the spring limit member and the extension cylinder with the cooperation of the slider and the vertical chute, and the threaded connection structure between the spring limit member and the handle. Such multiple cooperation structures make the structure of the whole differential pressure bypass valve relatively complex. Utility Model Content

[0005] The purpose of the present utility model is to propose a differential pressure bypass valve for the above problems existing in the prior art, and solve the problem of complex structure.

[0006] The purpose of the present utility model can be realized by the following technical solutions:

[0007] Differential pressure bypass valve, comprising a valve body with an inlet at the bottom and an outlet at the side, a valve hole communicating the inlet with the outlet is provided in the valve body, a spring seat, a spring and a valve core are successively arranged in the valve body from top to bottom, two ends of the spring respectively abut against the valve core and the spring seat, the lower end of the valve core abuts against the upper end orifice of the valve hole, a pressure regulating cover is sleeved outside the top of the valve body, and it is characterized in that the pressure regulating cover is threadedly connected with the valve body, an annular blocking member is fixedly connected inside the top of the valve body, the pressure regulating cover has a connecting column protruding from its inner top wall, the connecting column passes through the blocking member and abuts against the spring seat, the connecting column has an inner hole penetrating in the vertical direction, a connecting screw is arranged in the inner hole, a circular ring portion protruding from the inner hole wall is arranged in the inner hole of the connecting column, the rod portion of the connecting screw passes through the central hole of the circular ring portion, and the head of the connecting screw abuts against the upper side surface of the circular ring portion.

[0008] In the working state, the valve core abuts against the upper end orifice of the valve hole under the elastic force of the spring to cut off the passage between the inlet and the outlet. When the pressure at the water supply end increases, the valve core is pushed open to connect the inlet and the outlet of the differential pressure bypass valve, so that a part of water can flow back from the outlet to the pressure supply end to ensure that the pressure and flow rate of the water flowing to the user end remain unchanged. When pressure regulation is required, rotate the pressure regulating cover. Since the pressure regulating cover is threadedly connected with the valve body, it will move up and down. The head of the connecting screw is located in the inner hole of the connecting column and abuts against the upper side surface of the circular ring portion, and the lower end surface of the connecting column abuts against the spring seat, which is equivalent to positioning the pressure regulating cover vertically between the head of the connecting screw and the spring seat. In this way, when the pressure regulating cover moves downward along the thread, the spring seat can be pushed to move downward to compress the spring by the abutment between the connecting column and the spring seat, and when the pressure regulating cover moves upward along the thread, the connecting screw and the spring seat can be pushed to move upward to release the spring by the abutment between the circular ring portion and the head of the connecting screw, so as to realize the adjustment of the elastic force of the spring acting on the valve core.

[0009] This differential pressure bypass valve can obtain a structure capable of realizing the pressure regulating function by directly setting the pressure regulating cover and the valve body in a threaded connection and connecting the pressure regulating cover and the spring seat through connecting screws in the vertical direction, without the need to set up structures such as the cooperation between the horizontal annular protrusion and the horizontal annular installation groove and the cooperation between the slider and the vertical chute. Thus, while ensuring the normal realization of the pressure regulating function, the structure of the differential pressure bypass valve is simplified. Among them, the pressure regulating cover and the spring seat are connected together in the vertical direction by connecting screws. In this way, only by using the annular blocking member fixedly connected inside the top of the valve body, the maximum downward movement distance of the spring seat and the pressure regulating cover can be limited at the same time. Specifically, when the spring seat moves upward to abut against the blocking member, it will no longer move upward, and the pressure regulating cover will also not continue to move upward under the abutting action of the spring seat and the blocking member due to the existence of the connecting screws, preventing the pressure regulating cover from directly detaching from the valve body due to excessive rotation. While simplifying the structure, the reliability of use is ensured. Moreover, the connecting screws only connect the pressure regulating cover and the spring seat in the vertical direction and do not fix them circumferentially. That is to say, the pressure regulating cover will not drive the spring seat to rotate together, thus avoiding the situation where the spring is twisted due to the rotation of the spring seat. In the above differential pressure bypass valve, an annular protrusion is provided outside the top of the valve body, the pressure regulating cover is threadedly connected outside the annular protrusion, and several scale lines are sequentially arranged vertically below the annular protrusion on the valve body.

[0010] Combined with the setting of the scale lines, it enables users to more accurately adjust the pressure of the spring.

[0011] In the above differential pressure bypass valve, an annular installation groove is provided inside the top of the valve body, the blocking member is a shaft retaining ring, the outer edge of the shaft retaining ring is stuck in the annular installation groove, the inner edge of the shaft retaining ring extends outside the annular installation groove, and the inner diameter of the shaft retaining ring is smaller than the outer diameter of the spring seat.

[0012] The inner edge of the shaft retaining ring extends outside the annular installation groove, and the inner diameter of the shaft retaining ring is smaller than the outer diameter of the spring seat. In this way, the inner edge of the shaft retaining ring is located on the upward movement path of the spring seat, so as to be able to limit the maximum upward movement distance of the spring seat and prevent the spring seat from directly detaching from the valve body.

[0013] In the above differential pressure bypass valve, the valve core includes a core and a sealing gasket. The side of the core has an annular sealing groove, the sealing gasket is embedded in the annular sealing groove, the outer edge of the sealing gasket extends outside the annular sealing groove, and the bottom of the core has a guiding portion located in the valve hole and forming a guiding fit with the hole wall of the valve hole.

[0014] By providing a guiding portion at the bottom of the core, the guiding portion is located in the valve hole and forms a guiding fit with the hole wall of the valve hole. In this way, it can play a guiding role when the core moves up and down, preventing the core from being skewed and causing the valve core to be unable to normally close the valve hole when the pressure at the water supply end returns to normal.

[0015] In the differential pressure bypass valve described above, the cross-section of the guiding portion is cross-shaped.

[0016] The cross-shaped configuration not only ensures that the guiding portion can form a good guiding fit with the inner wall of the valve hole, but also does not affect the normal passage of water flow.

[0017] In the differential pressure bypass valve described above, the upper end of the core has an annular fitting portion, and the lower end of the spring is located within the fitting portion.

[0018] Through the above arrangement, the fitting stability between the spring and the valve core is ensured, and it is ensured that the elastic force of the spring can act stably on the valve core.

[0019] Compared with the prior art, the present differential pressure bypass valve has the following advantages:

[0020] 1. By directly providing a threaded connection between the pressure regulating cover and the valve body and connecting the pressure regulating cover and the spring seat through a connecting screw that passes through a connecting column in the vertical direction and is threadedly connected within the spring seat, a structure capable of realizing the pressure regulating function can be obtained, eliminating the need for structures such as the cooperation between a horizontal annular protrusion and a horizontal annular mounting groove and the cooperation between a slider and a vertical sliding groove. Thus, while ensuring the normal realization of the pressure regulating function, the structure of the differential pressure bypass valve is simplified;

[0021] 2. A ring-shaped blocking member is fixedly connected inside the top of the valve body to limit the maximum upward movement distance of the spring seat, preventing the pressure regulating cover from rotating excessively and directly detaching the spring seat from the valve body together, ensuring the reliability of use while simplifying the structure. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the present differential pressure bypass valve.

[0023] Figure 2 is a side view of the present differential pressure bypass valve.

[0024] Figure 3 is a three-dimensional schematic view of the core in the present differential pressure bypass valve.

[0025] In the figures, 1. Valve body; 1a. Inlet; 1b. Outlet; 1c. Valve hole; 1d. Annular mounting groove; 1e. Annular protrusion; 1f. Scale line; 2. Spring seat; 2a. Concave cavity; 2b. Positioning head; 3. Spring; 4. Valve core; 4a. Core; 4a1. Annular sealing groove; 4a2. Guiding portion; 4a3. Fitting portion; 4b. Sealing gasket; 5. Pressure regulating cover; 5a. Connecting column; 5a1. Inner hole; 5a2. Circular ring portion; 6. Connecting screw; 7. Sealing ring; 8. Blocking member. Detailed Embodiments

[0026] The following are specific embodiments of the present utility model, in combination with the accompanying drawings, to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0027] As Figure 1 and Figure 2 shown, the differential pressure bypass valve includes a valve body 1 with an inlet 1a at the bottom and an outlet 1b at the side. There is a valve hole 1c in the valve body 1 that connects the inlet 1a and the outlet 1b. The valve hole 1c is arranged vertically. Inside the valve body 1, a spring seat 2, a spring 3, and a valve core 4 are successively arranged from top to bottom. The two ends of the spring 3 respectively abut against the valve core 4 and the spring seat 2. The lower end of the valve core 4 abuts against the upper orifice of the valve hole 1c to achieve sealing. A pressure regulating cover 5 is sleeved outside the top of the valve body 1. The pressure regulating cover 5 is threadedly connected to the valve body 1. The pressure regulating cover 5 has a connecting column 5a protruding from its inner top wall. The lower end of the connecting column 5a abuts against the spring seat 2. The spring seat 2 and the pressure regulating cover 5 are connected in the vertical direction by a connecting screw 6 whose rod part passes through the connecting column 5a and is threadedly connected inside the spring seat 2. There is an annular convex part 1e outside the top of the valve body 1. The pressure regulating cover 5 is threadedly connected outside the annular convex part 1e. Outside the valve body 1, several graduation lines 1f are successively arranged vertically below the annular convex part 1e.

[0028] Specifically, as Figure 2 shown, the pressure regulating cover 5 is made of ABS material. The connecting column 5a has an inner hole 5a1 arranged vertically through it. In the inner hole 5a1 of the connecting column 5a, there is a circular ring part 5a2 protruding from the inner hole wall of the inner hole 5a1. The rod part of the connecting screw 6 passes through the central hole of the circular ring part 5a2. The head of the connecting screw 6 is located in the inner hole 5a1 of the connecting column 5a and abuts against the upper side of the circular ring part 5a2. The top of the spring seat 2 has a concave cavity 2a. The lower end of the connecting column 5a is located in the concave cavity 2a. A sealing ring 7 is embedded in the side of the spring seat 2. The sealing ring 7 abuts against the inner wall of the valve body 1 to form a seal. The bottom of the spring seat 2 has a positioning head 2b. The upper end of the spring 3 is sleeved outside the positioning head 2b. A ring-shaped blocking part 8 is fixedly connected inside the top of the valve body 1. The connecting column 5a passes through the blocking part 8. The function of the blocking part 8 is to limit the maximum upward movement distance of the spring seat 2 to prevent the pressure regulating cover 5 from rotating excessively and directly taking the spring seat 2 off the valve body 1 together. In this embodiment, an annular installation groove 1d is provided inside the top of the valve body 1. The blocking part 8 is a shaft retaining ring. The outer edge of the shaft retaining ring is stuck in the annular installation groove 1d. The inner edge of the shaft retaining ring extends outside the annular installation groove 1d. The inner diameter of the shaft retaining ring is smaller than the outer diameter of the spring seat 2.

[0029] In the working state, the valve core 4 abuts against the upper orifice of the valve hole 1c under the elastic force of the spring 3, blocking the passage between the inlet 1a and the outlet 1b. When the pressure at the water supply end increases, the valve core 4 is pushed open, causing the inlet 1a and the outlet 1b of the differential pressure bypass valve to communicate. In this way, a part of the water can flow back from the outlet 1b to the pressure supply end to ensure that the pressure and flow rate of the water flowing to the user end remain unchanged. When pressure adjustment is required, rotate the pressure adjustment cover 5. The pressure adjustment cover 5 is threadedly connected to the valve body 1 and will move up and down. The pressure adjustment cover 5 and the spring seat 2 are connected vertically through a rod passing through the connecting column 5a and a connecting screw 6 threadedly connected inside the spring seat 2. In this way, when the pressure adjustment cover 5 moves up and down, it will drive the spring seat 2 to move up and down, thereby realizing the adjustment of the elastic force of the spring 3 acting on the valve core 4.

[0030] By directly setting the pressure adjustment cover 5 and the valve body 1 to be threadedly connected and setting the pressure adjustment cover 5 and the spring seat 2 to be connected vertically through a rod passing through the connecting column 5a and a connecting screw 6 threadedly connected inside the spring seat 2, a structure capable of realizing the pressure adjustment function can be obtained, eliminating the need for structures such as the cooperation of a horizontal annular protrusion and a horizontal annular installation groove and the cooperation of a slider and a vertical chute. Thus, while ensuring the normal realization of the pressure adjustment function, the structure of the differential pressure bypass valve is simplified.

[0031] Furthermore, as Figure 1 and Figure 3 shown, the valve core 4 includes a core 4a and a sealing washer 4b. The side of the core 4a has an annular sealing groove 4a1. The sealing washer 4b is embedded in the annular sealing ring 7, and the outer edge of the sealing washer 4b extends outside the annular sealing groove 4a1. The core 4a is made of PSU material. The bottom of the core 4a has a guiding portion 4a2, which is located in the valve hole 1c and forms a guiding fit with the hole wall of the valve hole 1c. By providing the guiding portion 4a2 at the bottom of the core 4a, which is located in the valve hole 1c and forms a guiding fit with the hole wall of the valve hole 1c, it can play a guiding role when the core 4a moves up and down, preventing the core 4a from being skewed and causing the valve core 4 to be unable to close the valve hole 1c normally when the pressure at the water supply end returns to normal. Specifically, the cross-section of the guiding portion 4a2 is cross-shaped. The cross-shaped shape not only ensures that the guiding portion 4a2 can form a good guiding fit with the hole wall of the valve hole 1c but also does not affect the normal passage of water flow. The upper end of the core 4a has a circular ring-shaped fitting portion 4a3, and the lower end of the spring 3 is located inside the fitting portion 4a3. This setting ensures the cooperation stability between the spring 3 and the valve core 4, ensuring that the elastic force of the spring 3 can act stably on the valve core 4.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar ways for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A pressure differential bypass valve, comprising a valve body (1) having an inlet (1a) at the bottom and an outlet (1b) at the side, wherein the valve body (1) has a valve hole (1c) connecting the inlet (1a) with the outlet (1b), wherein the valve body (1) is provided with a spring seat (2), a spring (3) and a valve core (4) in sequence from top to bottom, wherein both ends of the spring (3) respectively abut against the valve core (4) and the spring seat (2), and the lower end of the valve core (4) abuts against the upper end opening of the valve hole (1c), and a pressure regulating cover (5) is connected to the outer sleeve of the top of the valve body (1), characterized in that: The pressure regulating cover (5) is threadedly connected to the valve body (1), and a ring-shaped blocking member (8) is fixedly connected to the top of the valve body (1). The pressure regulating cover (5) has a connecting column (5a) protruding from the inner top wall thereof, the connecting column (5a) passes through the blocking member (8) and abuts against the spring seat (2), the connecting column (5a) has an inner hole (5a1) extending through the inner hole (5a1) in a vertical direction, a connecting screw (6) is provided in the inner hole (5a1), the inner hole (5a1) of the connecting column (5a) has a circular ring portion (5a2) protruding from the hole wall of the inner hole (5a1), the rod portion of the connecting screw (6) passes through the center hole of the circular ring portion (5a2), and the head portion of the connecting screw (6) abuts against the upper side surface of the circular ring portion (5a2).

2. The pressure differential bypass valve according to claim 1, characterized in that: The valve body (1) has an annular protrusion (1e) on the outside of the top, the pressure regulating cover (5) is threadedly connected to the outside of the annular protrusion (1e), and a plurality of scale lines (1f) are sequentially provided on the outside of the valve body (1) below the annular protrusion (1e) in a vertical direction.

3. The pressure differential bypass valve according to claim 1 or 2, characterized in that: An annular mounting groove (1d) is provided in the top of the valve body (1), and the blocking member (8) is a shaft retaining ring, the outer edge of the shaft retaining ring is clamped in the annular mounting groove (1d), the inner edge of the shaft retaining ring extends out of the annular mounting groove (1d), and the inner diameter of the shaft retaining ring is smaller than the outer diameter of the spring seat (2).

4. The pressure differential bypass valve according to claim 1, characterized in that: The valve core (4) comprises a core (4a) and a sealing gasket (4b), the side of the core (4a) having an annular sealing groove (4a1), the sealing gasket (4b) being embedded in the annular sealing groove (4a1), the outer edge of the sealing gasket (4b) extending out of the annular sealing groove (4a1), and the bottom of the core (4a) having a guide portion (4a2) located in the valve hole (1c) and forming a guide fit with the hole wall of the valve hole (1c).

5. The pressure differential bypass valve according to claim 4, characterized in that: The cross section of the guide portion (4a2) is cross-shaped.

6. The pressure differential bypass valve according to claim 4, characterized in that: The upper end of the core (4a) has a circular matching portion (4a3), and the lower end of the spring (3) is located inside the matching portion (4a3).

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