Pressure reducing valve

Abstract

This invention provides a pressure reducing valve, including a valve body, a valve core assembly, and a pressure reducing and regulating assembly. The valve body has a valve cavity, and the valve body has an inlet, an outlet, and a pressure reducing port communicating with the valve cavity. The pressure reducing and regulating assembly includes a housing, a pressure-sensing diaphragm, and a regulating component. The pressure-sensing diaphragm divides the internal space of the housing into an upper chamber and a lower chamber. The housing is assembled onto the pressure reducing port, and the lower chamber communicates with the valve cavity. The regulating component is assembled onto the housing and located within the upper chamber. The valve core assembly includes a valve core with a valve stem guiding its linear movement. The regulating component applies force along the axial direction of the valve stem towards the side closest to the valve core assembly to the pressure-sensing diaphragm. The pressure-sensing diaphragm is located outside the pressure reducing port and has a diameter larger than that of the pressure reducing port. This invention improves the adjustment accuracy of the pressure reducing valve.

Description

Technical Field

[0001] This utility model relates to the field of pipeline valve design technology, specifically to a pressure reducing valve. Background Technology

[0002] Patent document CN2013320030514.7 discloses a constant pressure reducing valve. The reducing valve uses a piston as a constant pressure sensing element. In order to ensure a reliable seal between the piston and the valve body and prevent fluid leakage at the mating position, a sealing ring is set between the piston and the valve body in this technical solution. In actual use, the direction and magnitude of the friction force of the sealing ring are inconsistent with the reciprocating movement of the piston, resulting in insufficient adjustment accuracy of the reducing valve. At the same time, the sealing ring will also generate contaminants (wear debris) during the reciprocating movement of the piston, which may contaminate the pressure reducing fluid. Utility Model Content

[0003] The pressure reducing valve designed in this invention can at least partially solve the above problems.

[0004] The purpose of this utility model is to provide a pressure reducing valve, including a valve body, a valve core assembly, and a pressure reducing and regulating assembly. The valve body has a valve cavity, and the valve body has an inlet, an outlet, and a pressure reducing port communicating with the valve cavity. The pressure reducing and regulating assembly includes a housing, a pressure sensing diaphragm, and a regulating component. The pressure sensing diaphragm divides the internal space of the housing into an independent upper cavity and a lower cavity. The housing is assembled onto the pressure reducing port, and the lower cavity communicates with the valve cavity. The regulating component is assembled onto the housing and located within the upper cavity. The valve core assembly includes a valve core with a valve stem guiding its linear movement. The regulating component applies force along the axial direction of the valve stem towards the side closest to the valve core assembly to the pressure sensing diaphragm. The pressure sensing diaphragm is located outside the pressure reducing port and has a diameter larger than the diameter of the pressure reducing port.

[0005] In some embodiments, the housing includes a first cover and a second cover that are snapped together, with the outer edge of the pressure-sensing diaphragm sandwiched between the first cover and the second cover. A first mounting cylinder is formed at the end of the first cover away from the second cover. The housing is threadedly connected to the pressure-reducing port via the first mounting cylinder, and the inner diameter of the first mounting cylinder is smaller than the outer diameter of the pressure-sensing diaphragm; and / or, the valve stem and the valve core are separate structures.

[0006] In some embodiments, a second mounting cylinder is formed at the end of the second cover away from the first cover, and the pressure regulating assembly includes a pressure adjusting nut and a main spring clamped between the pressure adjusting nut and the pressure sensing diaphragm on the side away from the pressure reducing port, and the pressure adjusting nut is threadedly connected to the second mounting cylinder.

[0007] In some embodiments, the pressure adjusting nut has a damping hole that connects the external environment to the upper cavity.

[0008] In some embodiments, the pressure regulating assembly further includes a limiting piece located in the lower cavity. The limiting piece is abutted against the side of the pressure sensing diaphragm under the action of the main spring, and the diameter of the limiting piece is larger than the diameter of the lower end opening of the second mounting cylinder.

[0009] In some embodiments, a spring seat is provided between the main spring and the limiting piece, the bottom end of the main spring is fitted onto the top column of the spring seat, and the bottom end face of the spring seat and the limiting piece form a ball-and-socket fit.

[0010] In some embodiments, the valve core assembly further includes a push plate connected to the end of the valve stem away from the valve core, the outer diameter of the push plate being larger than the inner diameter of the opening of the first mounting cylinder.

[0011] In some embodiments, the pusher plate has a guide cylinder that slides with the inner cylinder of the first mounting cylinder, and the valve stem is connected to the guide cylinder.

[0012] In some embodiments, the valve core assembly further includes a valve core guide support and a secondary spring located within the valve core guide support, the secondary spring being capable of applying force to the valve core along the axial direction of the valve stem and toward the side closer to the pressure-sensing diaphragm.

[0013] In some embodiments, the valve body is further provided with a pressure relief port communicating with the valve cavity, and a safety valve assembly is provided in the pressure relief port.

[0014] The pressure reducing valve of this invention, on the one hand, uses a pressure-sensing diaphragm to seal and isolate the valve chamber and lower chamber where the valve core assembly is located from the upper chamber where the pressure regulating assembly is located. This allows for sensitive response to the outlet pressure by the deformation of the pressure-sensing diaphragm, thereby achieving pressure reduction. It eliminates the need for the piston and sealing ring configuration used in existing technologies, thus improving the adjustment accuracy of the pressure reducing valve and preventing fluid contamination due to sealing ring wear. On the other hand, the pressure-sensing diaphragm is located outside the valve body and its diameter is larger than that of the pressure reducing port. In other words, the outer diameter of the pressure-sensing diaphragm is not limited by the size of the valve body. A larger diaphragm has greater deformation capacity, further improving the adjustment accuracy of the pressure reducing valve. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a pressure reducing valve according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram (cross-section) of the internal structure of the pressure reducing valve in the image from a certain perspective;

[0017] Figure 3 yes Figure 1 A schematic diagram (cross-section) of the internal structure of the pressure reducing valve in the image from another perspective;

[0018] Figure 4 yes Figure 1 An exploded view of the pressure reducing valve in the diagram.

[0019] In the picture:

[0020] 1. Valve body; 11. Inlet; 12. Outlet; 13. Pressure reducing port; 14. Damping connecting hole; 21. Valve core; 22. Valve stem; 23. Push plate; 24. Valve core guide support; 25. Secondary spring; 26. Sealing nut; 31. Outer shell; 311. First cover; 3111. First mounting cylinder; 312. Second cover; 3121. Second mounting cylinder; 32. Pressure sensing diaphragm; 331. Pressure adjusting nut; 3311. Damping hole; 332. Main spring; 333. Limiting plate; 334. Spring seat; 41. Steel ball; 42. Safety valve spring; 43. Safety valve nut; 51. First sealing ring; 52. Second sealing ring. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0022] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0023] The following example describes a pressure-reducing valve of this utility model. This example is only a part of the embodiments of this utility model, but the protection scope of this utility model is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the protection scope of this utility model.

[0024] Please refer to the reference. Figures 1 to 4 As shown, according to an embodiment of the present invention, a pressure reducing valve is provided, including a valve body 1, a valve core assembly (not labeled in the figure), and a pressure reducing and regulating assembly (not labeled in the figure). A valve cavity (not labeled in the figure) is formed within the valve body 1, and an inlet 11, an outlet 12, and a pressure reducing port 13 communicating with the valve cavity are formed on the valve body 1. The pressure reducing and regulating assembly includes a housing 31, a pressure sensing diaphragm 32, and a regulating component (not labeled in the figure). The pressure sensing diaphragm 32 divides the internal space of the housing 31 into an independent upper cavity (not labeled in the figure, i.e., the cavity away from the valve cavity) and a lower cavity (…). (Unlabeled in the figure, i.e., the cavity near the valve chamber), the outer shell 31 is assembled on the pressure reducing port 13 and the lower cavity is connected to the valve chamber via the damping connecting hole 14. The pressure regulating component is assembled on the outer shell 31 and is located in the upper cavity. The valve core assembly includes a valve core 21, the valve core 21 has a valve stem 22 that guides its linear movement. The pressure regulating component can apply force to the pressure sensing diaphragm 32 along the axial direction of the valve stem 22 and toward the side near the valve core assembly. The pressure sensing diaphragm 32 is located outside the pressure reducing port 13 and has a diameter larger than the diameter of the pressure reducing port 13.

[0025] In this technical solution, on the one hand, a pressure-sensing diaphragm 32 is used to seal and isolate the valve chamber and lower chamber where the valve core assembly is located from the upper chamber where the pressure regulating assembly is located. This allows the deformation of the pressure-sensing diaphragm 32 to achieve sensitive response to the outlet pressure, thereby achieving pressure reduction. This eliminates the need for the piston configuration and sealing ring used in existing technologies, improving the adjustment accuracy of the pressure reducing valve and preventing fluid contamination due to sealing ring wear. On the other hand, the pressure-sensing diaphragm 32 is located outside the valve body 1 and has a diameter larger than that of the pressure reducing port 13. In other words, the outer diameter of the pressure-sensing diaphragm 32 is not limited by the size of the valve body 1. A larger diaphragm has greater deformation capacity, further improving the adjustment accuracy of the pressure reducing valve.

[0026] In some embodiments, the outer casing 31 includes a first cover 311 and a second cover 312 that are fastened to each other. The outer edge of the pressure-sensing diaphragm 32 is sandwiched between the first cover 311 and the second cover 312. A first mounting cylinder 3111 is formed at the end of the first cover 311 away from the second cover 312. The outer casing 31 is threadedly connected to the pressure relief port 13 via the first mounting cylinder 3111. The inner diameter of the first mounting cylinder 3111 is smaller than the outer diameter of the pressure-sensing diaphragm 32. In a specific embodiment, the aforementioned first cover 311 and second cover 312 are welded together.

[0027] In this technical solution, the outer shell 31 is composed of a first cover 311 and a second cover 312 that are interlocked with each other. The outer edge of the pressure sensing diaphragm 32 is clamped and fixed by the first cover 311 and the second cover 312 that are interlocked with each other, which simplifies the structure.

[0028] In some embodiments, the valve stem 22 and the valve core 21 can be an integrated structure, while in order to reduce the processing difficulty of the parts, the valve stem 22 and the valve core 21 are separate structures.

[0029] In some embodiments, a second mounting cylinder 3121 is formed at the end of the second cover 312 away from the first cover 311. The pressure regulating assembly includes a pressure adjusting nut 331 and a main spring 332 clamped between the pressure adjusting nut 331 and the pressure sensing diaphragm 32 on the side away from the pressure reducing port 13. The pressure adjusting nut 331 is threadedly connected to the second mounting cylinder 3121.

[0030] In this technical solution, the pressure adjusting nut 331 is threaded onto the second mounting cylinder 3121, which further simplifies the structural design of the pressure reducing valve and improves the structural compactness of the pressure reducing valve.

[0031] In some embodiments, the pressure adjusting nut 331 has a damping hole 3311 that connects the external environment to the upper cavity, which can make the deformation of the main spring 332 more stable and reduce the vibration noise of the main spring 332.

[0032] In some embodiments, the pressure regulating assembly further includes a limiting piece 333 located in the lower cavity. The limiting piece 333 is connected to the side of the pressure sensing diaphragm 32 under the action of the main spring 332, and the diameter of the limiting piece 333 is larger than the diameter of the lower end of the second mounting cylinder 3121.

[0033] In this technical solution, by setting a limiting piece 333 on the side of the pressure sensing diaphragm 32, it is possible to prevent the pressure sensing diaphragm 32 from moving and deforming too much toward the main spring 332, which could lead to rupture.

[0034] In some embodiments, a spring seat 334 is provided between the main spring 332 and the limiting piece 333. The bottom end of the main spring 332 is fitted onto the top column of the spring seat 334, and a ball-and-socket fit is formed between the bottom end face of the spring seat 334 and the limiting piece 333.

[0035] In this technical solution, the spring seat 334 and the limiting piece 333 are connected by a ball head and ball socket to form an axially limited and circumferentially free rotation connection. This ensures that the limiting piece 333 does not rotate when the pressure needs to be adjusted, i.e., when the pressure adjusting nut 331 is turned, thus preventing the pressure sensing diaphragm 32 from being twisted or torn.

[0036] In some embodiments, the valve core assembly further includes a push plate 23 connected to the end of the valve stem 22 away from the valve core 21. The outer diameter of the push plate 23 is larger than the inner diameter of the opening of the first mounting cylinder 3111. In this way, on the one hand, the use of a larger push plate 23 can achieve uniform force on the aforementioned pressure sensing diaphragm 32. On the other hand, since the outer diameter of the push plate 23 is larger than that of the first mounting cylinder 3111, the push plate 23 can be axially limited by the opening of the first mounting cylinder 3111, ensuring the tearing of the larger pressure sensing diaphragm 32.

[0037] In some embodiments, the push plate 23 has a guide cylinder (not labeled in the figure) that slides with the inner cylinder of the first mounting cylinder 3111, and the valve stem 22 is connected to the guide cylinder, thereby enabling the push plate 23 to slide more smoothly and stably.

[0038] In some embodiments, the valve core assembly further includes a valve core guide support 24 and a secondary spring 25 located within the valve core guide support 24. The secondary spring 25 is capable of applying force to the valve core 21 along the axial direction of the valve stem 22 and toward the side closer to the pressure-sensing diaphragm 32. See [link to relevant documentation]. Figure 2 As shown, the end of the aforementioned secondary spring 25 away from the valve core 21 is axially limited by the sealing nut 26, while the other end elastically applies force to the valve core 21. In a specific embodiment, the aforementioned valve core guide support 24 is specifically a ring support frame with three legs.

[0039] In some embodiments, the valve body 1 also has a pressure relief port (not shown in the figure) communicating with the valve cavity, and a safety valve assembly is provided in the pressure relief port, see details below. Figure 3 As shown, the safety valve assembly includes a steel ball 41, a safety valve spring 42, and a safety valve nut 43 (with a pressure relief hole). The safety valve nut 43 is threaded into the pressure relief hole, and the safety valve spring 42 is clamped between the safety valve nut 43 and the steel ball 41. This realizes a one-way valve pressure relief structure. When the fluid pressure is higher than its opening pressure, the fluid will exert force on the steel ball 41 to open the pressure relief hole and release pressure, preventing safety hazards caused by excessive pressure.

[0040] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure reducing valve characterized by comprising: The system includes a valve body (1), a valve core assembly, and a pressure reducing and regulating assembly. The valve body (1) has a valve cavity, and the valve body (1) has an inlet (11), an outlet (12), and a pressure reducing port (13) communicating with the valve cavity. The pressure reducing and regulating assembly includes a housing (31), a pressure sensing diaphragm (32), and a regulating component. The pressure sensing diaphragm (32) divides the internal space of the housing (31) into an independent upper cavity and a lower cavity. The housing (31) is assembled onto the pressure reducing port (13). The lower chamber is connected to the valve chamber. The pressure regulating assembly is assembled on the outer shell (31) and located in the upper chamber. The valve core assembly includes a valve core (21). The valve core (21) has a valve stem (22) that guides its linear movement. The pressure regulating assembly can apply force to the pressure sensing diaphragm (32) along the axial direction of the valve stem (22) and toward the side closer to the valve core assembly. The pressure sensing diaphragm (32) is located outside the pressure reducing port (13) and has a diameter larger than that of the pressure reducing port (13).

2. The pressure reducing valve according to claim 1, characterized by The outer casing (31) includes a first cover (311) and a second cover (312) that are fastened to each other. The outer edge of the pressure-sensing diaphragm (32) is sandwiched between the first cover (311) and the second cover (312). A first mounting cylinder (3111) is formed at the end of the first cover (311) away from the second cover (312). The outer casing (31) is threaded to the pressure-reducing port (13) via the first mounting cylinder (3111). The inner diameter of the first mounting cylinder (3111) is smaller than the outer diameter of the pressure-sensing diaphragm (32). And / or, the valve stem (22) and the valve core (21) are separate structures.

3. The pressure reducing valve according to claim 2, characterized by The second cover (312) has a second mounting cylinder (3121) formed at one end away from the first cover (311). The pressure regulating component includes a pressure adjusting nut (331) and a main spring (332) clamped between the pressure adjusting nut (331) and the pressure sensing diaphragm (32) on the side away from the pressure reducing port (13). The pressure adjusting nut (331) is threaded into the second mounting cylinder (3121).

4. The pressure reducing valve according to claim 3, characterized in that, The pressure adjusting nut (331) has a damping hole (3311) that connects the external environment with the upper cavity.

5. The pressure reducing valve according to claim 3, characterized in that, The pressure regulating assembly also includes a limiting piece (333) located in the lower cavity. The limiting piece (333) is connected to the side of the pressure sensing diaphragm (32) under the action of the main spring (332), and the diameter of the limiting piece (333) is greater than the diameter of the lower end of the second mounting cylinder (3121).

6. The pressure reducing valve according to claim 5, characterized in that, A spring seat (334) is provided between the main spring (332) and the limiting piece (333). The bottom end of the main spring (332) is fitted onto the top column of the spring seat (334). The bottom end face of the spring seat (334) and the limiting piece (333) form a ball-and-socket fit.

7. The pressure reducing valve according to claim 2, characterized in that, The valve core assembly also includes a push plate (23) connected to the end of the valve stem (22) away from the valve core (21), wherein the outer diameter of the push plate (23) is larger than the inner diameter of the opening of the first mounting cylinder (3111).

8. The pressure reducing valve according to claim 7, characterized in that, The push plate (23) has a guide cylinder that slides with the inner cylinder of the first mounting cylinder (3111), and the valve stem (22) is connected to the guide cylinder.

9. The pressure reducing valve according to claim 1, characterized in that, The valve core assembly also includes a valve core guide support (24) and a secondary spring (25) located within the valve core guide support (24), the secondary spring (25) being able to apply force to the valve core (21) along the axial direction of the valve stem (22) and toward the side closer to the pressure sensing diaphragm (32).

10. The pressure reducing valve according to claim 1, characterized in that, The valve body (1) also has a pressure relief port that communicates with the valve cavity, and a safety valve assembly is provided in the pressure relief port.

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