Differential pressure control valve
By placing the diaphragm on the upper part of the valve sleeve and above the spring seat in the pressure differential control valve, the structure is simplified and the leakage point is reduced, and the problems of complex structure and insufficient sealing in the prior art are solved, and the more Good sealing and assembly ease.
Patent Information
- Application Number
- CN202323568462.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-26
AI Technical Summary
The existing pressure differential adjustment device has problems such as complex structure, cumbersome assembly and insufficient sealing, which leads to prone to water leakage during long-term use.
A pressure differential control valve is designed, which simplifies the structure by placing the diaphragm in the upper part of the valve sleeve and above the spring seat, and only the sleeve and threaded top cover on the top of the sleeve are required to reduce leakage points. , and sealing is ensured through the design of the pressure guide channel and pressure guide cavity.
It realizes the simplification of the structure and the convenience of assembly, while improving the sealing during long-term use, avoiding water leakage problems.
Smart Images
Figure CN222163685U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of machinery and relates to a pressure difference control valve. Background Art
[0002] In the existing flow system, it is required to be able to adjust and stabilize the pressure difference between the pressure of the water supply pipeline and the water pressure in the return pipeline, so as to effectively avoid excessively high or low flow rate and noise in the pipeline. To this end, someone has designed a pressure difference regulating device with patent application number 202320959294.5, which includes a pipe joint and a valve component. The pipe joint has a water inlet and a water outlet. A valve plate is formed inside the pipe joint, and a valve port is opened on the valve plate; the valve component includes a valve core, a pressure comparison chamber, a spring and a pressure comparison interface. The valve core faces the valve port and can control the opening of the valve port by axial movement. A diaphragm is provided in the pressure comparison chamber to separate it into a first chamber and a second chamber. The water inlet is connected to the first chamber, and the spring directly or indirectly applies an elastic force from the first chamber to the second chamber to the diaphragm. The pressure comparison interface is used to provide pressure to the second chamber. External pressure fluid; the valve component also includes a valve sleeve and a valve stem, a pressure comparison chamber is formed in the valve sleeve, the valve stem is inserted into the valve sleeve and the middle part of the diaphragm is connected to the valve stem, the valve core is connected to the head of the valve stem, the spring is arranged in the valve sleeve and is used to apply elastic force to the valve stem, and the end of the valve core is axially provided with a guide channel, which passes through the first chamber; an annular flow chamber is formed in the valve sleeve in the area where the spring is located, and the annular flow chamber is connected to the second chamber, a pressure comparison interface is formed on the valve sleeve and is connected to the annular flow chamber, a guide component is arranged in the annular flow chamber, the valve stem is threadedly connected to the guide component, and the spring is arranged between the guide component and the bottom of the annular flow chamber.
[0003] When in use, the pressurized water from the water supply line enters the second chamber, and the pressurized water from the return line enters the first chamber. The pressure difference between the two is roughly equal to the elastic force of the spring and the resistance of the diaphragm. Since the elastic force of the spring is fixed, the pressure difference is relatively constant. For example, when the water pressure in the water supply line increases, the diaphragm drives the valve stem and the valve core to move downward, the opening of the valve port becomes smaller, and the throttling pressure increases, thereby increasing the pressure in the return line, thereby obtaining a constant pressure difference.
[0004] However, in conjunction with its instruction manual Figure 2 It can be seen that the diaphragm is located at the lower part of the valve stem, the guide component is located at the upper part of the valve stem, the entire valve sleeve is composed of a lower cover, an upper cover threadedly connected to the lower cover, and a component threadedly connected to the upper part of the upper cover, the pressure comparison chamber is surrounded by the upper cover and the lower cover, and the annular flow chamber is surrounded by the upper cover and the component threadedly connected to the upper part of the upper cover, which has many parts and complicated assembly. In addition, a sealing ring is required between the upper cover and the component threadedly connected to the upper part of the upper cover to ensure sealing, but the sealing ring will age and leak after long-term use. Utility Model Content
[0005] The utility model aims to solve the above problems in the prior art and proposes a pressure difference control valve to solve the problems of complex structure and complicated assembly.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] The closure of the valve body is connected with the spring which is fixed to the valve body by the spring which is fixed on the closure of the valve body, and the closure of the valve body is connected with the spring which is fixed on the closure of the valve body.
[0008] The use of the differential pressure control valve is the same as that of the existing one. When in use, the differential pressure control valve is connected to the return water pipeline, and the water pressure of the return water is introduced into the second pressure guiding chamber through the pressure guiding channel, and then the water pressure of the supply water pipeline is introduced into the first pressure guiding chamber through a pressure guiding pipe connected to the pressure guiding port. When the water pressure of the supply water increases, the diaphragm is deformed downward and drives the pressure regulating rod to move downward, so that the opening of the valve port becomes smaller to increase the throttling pressure, so that the pressure in the return water pipeline is also increased so that the pressure difference between the supply water and the return water is kept constant.
[0009] In the differential pressure control valve, the diaphragm is arranged in the upper part of the valve sleeve and above the spring seat. Such arrangement ensures the normal pressure regulating function while making the valve sleeve only need to consist of a sleeve body and a top cover threadedly connected to the top of the sleeve body. That is to say, compared with the valve body in the prior art which must be composed of three parts, the structure of the differential pressure control valve is simpler and more convenient to assemble. At the same time, such a structure also reduces the leakage points at the valve sleeve and ensures the sealing performance in long-term use.
[0010] In the above-mentioned differential pressure control valve, the sleeve is cylindrical, and the outer peripheral side of the upper end of the sleeve has an annular convex portion, the edge of the annular convex portion has an upward annular flange, and the top cover is threadedly connected to the annular flange.
[0011] The diaphragm has a certain area. Through the above arrangement, the top of the cylindrical sleeve can match the shape of the diaphragm, so as to fix the edge of the diaphragm after the top cover is threadedly connected to the annular flange.
[0012] In the above-mentioned differential pressure control valve, there is a gap between the outer wall of the spring seat and the inner wall of the valve sleeve.
[0013] In practice, after a portion of the water in the return water pipeline enters the second pressure-conducting chamber from the pressure-conducting channel, it will flow through the gap between the outer wall of the spring seat and the inner wall of the valve sleeve and act on the lower side of the diaphragm. This arrangement ensures that the spring seat is located below the diaphragm and the return water pressure can still act on the diaphragm normally.
[0014] In the above-mentioned differential pressure control valve, as another technical solution, a plurality of water holes are provided on the spring seat along the axial direction of the pressure regulating rod.
[0015] After a portion of the water in the return water pipeline enters the second pressure-conducting cavity from the pressure-conducting channel, it will flow through the water-passing hole of the spring seat and act on the lower side of the diaphragm. This arrangement ensures that the spring seat is located below the diaphragm and the return water pressure can still act on the diaphragm normally.
[0016] In the above-mentioned differential pressure control valve, the pressure conducting channel includes a pressure conducting hole 1 and a plurality of pressure conducting holes 2. The pressure conducting hole 1 is arranged along the axial direction of the pressure regulating rod and passes through the lower end portion of the pressure regulating rod. Each pressure conducting hole 2 is connected to one side of the pressure conducting hole and each pressure conducting hole 2 is located in the second pressure conducting cavity.
[0017] In the above-mentioned differential pressure control valve, the valve body has a water inlet and a water outlet and the valve port connects the water inlet and the water outlet. The valve body also has a connection port 1 connected to the water inlet and having an internal thread and a connection port 2 connected to the water outlet and having an internal thread.
[0018] The setting of the connection port 1 and the connection port 2 can be used to connect a sewage valve with a motor to perform timed switch sewage discharge, or to connect a pressure display device, etc. Of course, when not in use, the connection port 1 and the connection port 2 are both blocked with a plug.
[0019] Compared with the prior art, the differential pressure control valve of the present invention sets the diaphragm in the upper part of the valve sleeve and above the spring seat. Such a setting ensures the normal pressure regulating function while making the valve sleeve only need to consist of a sleeve body and a top cover threadedly connected to the top of the sleeve body. That is to say, compared with the valve body in the prior art which must be composed of three parts, the structure of the differential pressure control valve of the present invention is simpler and more convenient to assemble. At the same time, such a structure also reduces the leakage points at the valve sleeve and ensures the sealing performance in long-term use. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional schematic diagram of the differential pressure control valve.
[0021] Figure 2 It is a cross-sectional view of the differential pressure control valve.
[0022] Figure 3 It is a top view diagram of the cooperation between the spring seat and the valve sleeve.
[0023] In the figure, 1, valve body; 1a, water inlet; 1b, water outlet; 1c, valve port; 1d, connection port 1; 1e, connection port 2; 2, valve sleeve; 2a, sleeve body; 2a1, annular convex part; 2a2, annular flange; 2b, top cover; 2b1, pressure-conducting port; 2b2, columnar part; 3, pressure-regulating rod; 3a, pressure-conducting channel; 3a1, pressure-conducting hole 1; 3a2, pressure-conducting hole 2; 4, diaphragm; 5, spring seat; 6, spring; 7, first pressure-conducting chamber; 8, second pressure-conducting chamber; 9, control rod; 10, gap. DETAILED DESCRIPTION
[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0025] Embodiment 1
[0026] like Figure 1-Figure 3 As shown, the differential pressure control valve comprises a valve body 1, a valve sleeve 2 and a pressure regulating assembly. The valve body 1 has a water inlet 1a, a water outlet 1b and a valve port 1c connecting the water inlet 1a and the water outlet 1b. The valve body 1 is threadedly connected to the valve body 1 and the pressure regulating assembly can adjust the opening of the valve port 1c. The pressure regulating assembly comprises a pressure regulating rod 3 which is inserted into the valve sleeve 2 and has a lower end located in the valve body 1 and is arranged toward the valve port 1c, a spring seat 5 which is threadedly connected to the pressure regulating rod 3 and is circumferentially fixed to the valve sleeve 2, a diaphragm 4 which is positioned on the pressure regulating rod 3 and a spring 6 which acts upward on the pressure regulating rod 3 with elastic force. In this embodiment, the valve body 1 also has a connection port 1d which is connected to the water inlet 1a and has an internal thread, and a connection port 2 1e which is connected to the water outlet 1b and has an internal thread. The setting of the connection port 1d and the connection port 2 1e can be used to connect a sewage valve with a motor to perform timed switch sewage discharge, or to connect a pressure display device, etc. Of course, when not in use, both the connection port 1 1d and the connection port 2 1e are blocked with plugs.
[0027] Furthermore, the valve sleeve 2 includes a sleeve body 2a and a top cover 2b threadedly connected to the top of the sleeve body 2a, the edge of the diaphragm 4 is fixed between the valve sleeve 2 and the top cover 2b, a first pressure-conducting cavity 7 is formed between the diaphragm 4 and the inner wall of the top cover 2b, a pressure-conducting port 2b1 communicating with the first pressure-conducting cavity 7 is provided on the top cover 2b, a second pressure-conducting cavity 8 is formed between the diaphragm 4 and the inner wall of the valve sleeve 2, and both ends of the spring 6 are respectively against the spring seat 5 and the inner bottom wall of the valve sleeve 2. The sleeve body 2a is cylindrical, and the outer peripheral side of the upper end of the sleeve body 2a has an annular convex portion 2a1, and the edge of the annular convex portion 2a1 has an upward annular flange 2a2, the top cover 2b is threadedly connected to the annular flange 2a2, and the diaphragm 4 is located between the annular flange 2a2 and the top cover 2b. The pressure regulating rod 3 is provided with a pressure-conducting channel 3a, and the two ports of the pressure-conducting channel 3a are respectively communicated with the inner cavity of the valve body 1 and the second pressure-conducting cavity 8. The pressure conducting channel 3a includes a pressure conducting hole 1 3a1 and a plurality of pressure conducting holes 2 3a2. The pressure conducting hole 1 3a1 is arranged along the axial direction of the pressure regulating rod 3 and passes through the lower end of the pressure regulating rod 3. Each pressure conducting hole 2 3a2 is laterally connected to the pressure conducting hole 1 3a1 and each pressure conducting hole 2 3a2 is located in the second pressure conducting cavity 8.
[0028] When in use, the valve body 1 is connected to the return water pipeline. After the water on the return water pipeline enters the valve body 1, part of it will enter the second pressure-conducting chamber 8 through the pressure-conducting channel 3a and act on the lower side of the diaphragm 4. The pressure-conducting port 2b1 is connected to the water supply pipeline through a pressure-conducting pipe, and part of the water on the water supply pipeline enters the first pressure-conducting chamber 7 from the pressure-conducting pipe and acts on the upper side of the diaphragm 4. Under normal conditions, the pressure difference between the water supply pipeline and the return water pipeline is equal to the elastic force of the spring 6. When the water pressure of the water supply increases, the water supply pressure causes the diaphragm 4 to deform downward and drives the pressure regulating rod 3 to move downward. The distance between the lower end of the pressure regulating rod 3 and the valve port 1c becomes smaller, and the opening of the valve port 1c becomes smaller, so that the throttling pressure will increase, and the pressure in the return water pipeline will also increase accordingly, so that the pressure difference between the supply water and the return water can be kept constant. When the water pressure of the supply water decreases, the diaphragm 4 is deformed upward under the combined action of the return water pressure and the spring 6 and drives the pressure regulating rod 3 to move upward. The distance between the lower end of the pressure regulating rod 3 and the valve port 1c becomes larger, thereby increasing the opening of the valve port 1c. In this way, the throttling pressure will decrease, and the pressure in the return water pipeline will also decrease accordingly, so that the pressure difference between the supply water and the return water remains constant.
[0029] In the differential pressure control valve, the diaphragm 4 is arranged in the upper part of the valve sleeve 2 and above the spring seat 5. Such arrangement ensures the normal pressure regulating function while making the valve sleeve 2 only need to consist of the sleeve body 2a and the top cover 2b threadedly connected to the top of the sleeve body 2a. That is to say, compared with the valve body 1 in the prior art which must be composed of three parts, the structure of the differential pressure control valve is simpler and more convenient to assemble. At the same time, such a structure also reduces the leakage points at the valve sleeve 2, ensuring the sealing performance in long-term use.
[0030] Furthermore, the upper side of the top cover 2b has a columnar portion 2b2 protruding upward, and a control rod 9 is inserted into the columnar portion 2b2. The lower end of the control rod 9 has a non-circular matching hole, and the upper end of the pressure regulating rod 3 is inserted into the matching hole and the two are circumferentially fixed. The spring seat 5 is threadedly connected to the pressure regulating rod 3, and the spring seat 5 is circumferentially fixed to the sleeve body 2a, so that when the control rod 9 is rotated, the pressure regulating rod 3 is driven to rotate, thereby driving the spring seat 5 up and down through the thread to change the compression degree of the spring 6, that is, changing the elastic force of the spring 6 acting on the pressure regulating rod 3. There is a gap 10 between the outer wall of the spring seat 5 and the inner wall of the valve sleeve 2. In this embodiment, the outer contour of the spring seat 5 is hexagonal, the inner hole of the valve sleeve 2 is a hexagonal hole, and the outer size of the spring seat 5 is slightly smaller than the inner hole size of the valve sleeve 2. Through such an arrangement, the spring seat 5 and the valve sleeve 2 are circumferentially fixed, and at the same time, there is a gap 10 between the outer wall of the spring seat 5 and the inner wall of the valve sleeve 2. The gap 10 ensures that the water entering the second pressure guiding chamber 8 can smoothly act on the lower side of the diaphragm 4.
[0031] Embodiment 2
[0032] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, a plurality of water holes are provided on the spring seat 5 along the axial direction of the pressure regulating rod 3 .
[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A differential pressure control valve, comprising a valve body (1) having a valve port (1c) therein, a valve sleeve (2) threadedly connected to the valve body (1), and a pressure regulating assembly capable of adjusting the opening of the valve port (1c), wherein the pressure regulating assembly comprises a pressure regulating rod (3) which is inserted into the valve sleeve (2) and has a lower end located in the valve body (1) and arranged toward the valve port (1c), a spring seat (5) threadedly connected to the pressure regulating rod (3) and circumferentially fixed to the valve sleeve (2), a diaphragm (4) positioned on the pressure regulating rod (3), and a spring (6) whose elastic force acts upward on the pressure regulating rod (3), wherein the pressure regulating rod (3) is provided with a pressure guiding channel (3a), characterized in that: The valve sleeve (2) comprises a sleeve body (2a) and a top cover (2b) threadedly connected to the top of the sleeve body (2a); the edge of the diaphragm (4) is fixed between the valve sleeve (2) and the top cover (2b); a first pressure-conducting cavity (7) is formed between the diaphragm (4) and the inner wall of the top cover (2b); a pressure-conducting port (2b1) communicating with the first pressure-conducting cavity (7) is provided on the top cover (2b); a second pressure-conducting cavity (8) is formed between the diaphragm (4) and the inner wall of the valve sleeve (2); the spring seat (5) is located in the second pressure-conducting cavity (8); two ends of the spring (6) are respectively abutted against the spring seat (5) and the inner bottom wall of the valve sleeve (2); and two ends of the pressure-conducting channel (3a) are respectively communicated with the inner cavity of the valve body (1) and the second pressure-conducting cavity (8).
2. The differential pressure control valve according to claim 1, characterized in that: The sleeve (2a) is cylindrical, and has an annular convex portion (2a1) on the outer peripheral side of the upper end of the sleeve (2a). The edge of the annular convex portion (2a1) has an upward annular flange (2a2), and the top cover (2b) is threadedly connected to the annular flange (2a2).
3. The differential pressure control valve according to claim 1 or 2, characterized in that: There is a gap (10) between the outer wall of the spring seat (5) and the inner wall of the valve sleeve (2).
4. The differential pressure control valve according to claim 1 or 2, characterized in that: The spring seat (5) is provided with a plurality of water holes along the axial direction of the pressure regulating rod (3).
5. The differential pressure control valve according to claim 1, characterized in that: The pressure-conducting channel (3a) comprises a pressure-conducting hole 1 (3a1) and a plurality of pressure-conducting holes 2 (3a2); the pressure-conducting hole 1 (3a1) is arranged along the axial direction of the pressure-regulating rod (3) and passes through the lower end of the pressure-regulating rod (3); each of the pressure-conducting holes 2 (3a2) is laterally connected to the pressure-conducting hole 1 (3a1) and each of the pressure-conducting holes 2 (3a2) is located in the second pressure-conducting cavity (8).
6. The differential pressure control valve according to claim 1, characterized in that: The valve body (1) has a water inlet (1a) and a water outlet (1b), and the valve port (1c) connects the water inlet (1a) and the water outlet (1b). The valve body (1) also has a first connection port (1d) connected to the water inlet (1a) and having an internal thread, and a second connection port (1e) connected to the water outlet (1b) and having an internal thread.