Cavitation-preventing high-sensitivity pressure relief safety valve
By designing the sliding connection and pressure regulating mechanism between the piston head and the sealing cover in the pressure relief safety valve, we ensure that only the bottom surface of the piston head is in contact with the medium, solving the problem of cavitation during the pressure relief process and improving the pressure relief sensitivity and sealing performance , achieving a safer and more reliable pressure relief effect.
Patent Information
- Application Number
- CN202420470575.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-12
AI Technical Summary
During the pressure relief process of existing pressure relief safety valves, large-area contact between the plug and the medium can easily lead to cavitation, affecting the sensitivity and overall sealing.
A high-sensitive pressure relief safety valve for anti-cavitation corrosion is designed. By setting the inlet and pressure relief pipe opening at the bottom of the valve body, and slidingly connecting it between the piston head and the sealing cover, ensuring that only the bottom surface of the piston head is Media contact reduces contact area, and pressure regulating screws and compression springs are used to control pressure relief pressure to ensure sealing and sensitivity.
It effectively reduces the contact area between the piston head and the medium, prevents cavitation, improves pressure relief sensitivity and overall sealing, and makes the safety valve safer and more reliable.
Smart Images
Figure CN222142100U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of pressure relief safety valves, and in particular relates to an anti-cavitation high-sensitivity pressure relief safety valve. Background Art
[0002] Safety valves are special valves whose opening and closing parts are normally closed under the action of external forces. When the medium pressure in the equipment or pipeline exceeds the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. Safety valves belong to automatic valves and are mainly used in boilers, pressure vessels and pipelines to control the pressure not to exceed the specified value, which plays an important protective role in personal safety and equipment operation. Note: Safety valves must undergo pressure tests before use.
[0003] However, in the existing pressure relief safety valve, the plug will come into contact with the conveyed medium over a large area during the pressure relief process, which can easily cause cavitation on the plug, thereby affecting the overall sensitivity.
[0004] Therefore, it is very necessary to invent a high-sensitivity pressure relief safety valve that prevents cavitation. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a technical solution adopted by a cavitation-proof high-sensitivity pressure relief safety valve: an cavitation-proof high-sensitivity pressure relief safety valve, comprising a valve body, wherein: a one-piece pipe inlet is provided at the bottom end of the valve body, and an one-piece pressure relief pipe port is provided on one side of the valve body, and the pipe inlet and the pressure relief pipe port are connected to the inside of the valve body; a sealing cover is fixedly installed on the top end of the valve body by bolts;
[0006] Preferably, a pressure relief chamber is provided inside the top of the valve body, and a piston head for blocking the pipe inlet is slidably installed inside the valve body, the piston head is in the pressure relief chamber and is slidably connected to the pressure relief chamber; the pipe inlet and the pressure relief pipe port are connected to the pressure relief chamber; the piston head is slidably connected to the sealing cover;
[0007] Preferably, the diameter of the piston head matches the diameter of the pressure relief chamber, and the thickness of the piston head is greater than the diameter of the pressure relief pipe port, and the diameter of the piston head is greater than the diameter of the pipe inlet; the depth of the pressure relief chamber is twice the thickness of the piston head;
[0008] Preferably, a core shaft is fixedly installed inside the piston head, and a pressure regulating screw is slidably installed on the top end of the core shaft, and the top end of the pressure regulating screw extends out of the sealing cover and is connected to the sealing cover through a thread;
[0009] Preferably, a compression spring and a ring sleeve are sleeved on the pressure-adjusting screw, and the compression spring and the ring sleeve are slidably connected, and the ring sleeve is at the top end of the compression spring, and the diameter of the ring sleeve is larger than the diameter of the compression spring.
[0010] Preferably, a threaded hole is penetrated through the center of the sealing cover, and a threaded sealing sleeve is fixedly installed in the threaded hole, and a plurality of positioning columns are evenly distributed and fixedly installed inside the sealing cover; the positioning columns are arranged in a circular array with the threaded hole as the center; the threaded sealing sleeve is sleeved on the pressure regulating screw and is threadedly connected to the pressure regulating screw; the positioning column is slidably connected to the piston head.
[0011] Preferably, an axial cavity is opened at the center of the bottom end of the pressure-regulating screw, and a locking nut is fixedly installed on the pressure-regulating screw through a thread, and the locking nut is located outside the sealing cover; the top end of the core shaft is located in the axial cavity and is slidably connected to the axial cavity; the length of the axial cavity is greater than the length of the core shaft.
[0012] Preferably, a plug is fixedly installed at the bottom end of the piston head, and a displacement cavity is opened inside the piston head, and a limiting hole is opened at the top end of the piston head; the limiting hole is connected to the displacement cavity; a plurality of limiting cavities are evenly distributed at one end of the piston head, and the limiting cavities are arranged in a circular array with the displacement cavity as the center; a nut is fixedly installed at the bottom of the displacement cavity inside the piston head; the bottom end of the core shaft is fixedly installed in the nut through the limiting hole; the bottom end of the pressure-regulating screw extends into the displacement cavity through the limiting hole, and the pressure-regulating screw is slidably connected with the limiting hole and the displacement cavity; the bottom end of the positioning column extends into the corresponding limiting cavity and is slidably connected with the corresponding limiting cavity; the plug is sealed in the pipe inlet and is slidably connected with the pipe inlet; the compression spring and the ring sleeve are in the displacement cavity.
[0013] Preferably, a sealing gasket is fixedly installed between the valve body and the sealing cover.
[0014] Compared with the prior art, the advantages of the utility model are:
[0015] The overall arrangement of the utility model can always allow only the bottom surface of the piston head and the plug to contact the conveyed medium during pressure relief. In this way, the contact area with the conveyed medium can be effectively reduced, and the piston head can be prevented from being cavitated, thereby ensuring the overall sealing, improving the pressure relief sensitivity, and making the whole safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall half-section structure of the utility model.
[0017] Figure 2 It is a partial enlarged structural schematic diagram of point A of the utility model.
[0018] Figure 3 It is a schematic diagram of the overall structure of the utility model.
[0019] In the figure:
[0020] Valve body 1, pipe inlet 2, pressure relief pipe outlet 3, sealing cover 4, positioning column 41, pressure regulating screw 5, shaft cavity 51, piston head 6, plug 61, displacement cavity 62, limit hole 63, limit cavity 64, nut 65, core shaft 7, compression spring 8, locking nut 9, threaded sealing sleeve 10, pressure relief cavity 11, and ring sleeve 12. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0022] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.
[0023] The utility model is further described below in conjunction with the accompanying drawings:
[0024] Embodiment 1
[0025] Reference Figure 1-3 , an anti-cavitation high-sensitivity pressure relief safety valve, comprising a valve body 1, wherein: a one-piece pipe inlet 2 is arranged at the bottom end of the valve body 1, and a one-piece pressure relief pipe port 3 is arranged at one side of the valve body 1, and the pipe inlet 2 and the pressure relief pipe port 3 are connected to the inside of the valve body 1; a sealing cover 4 is fixedly installed at the top of the valve body 1 by bolts, and the setting of the sealing cover 4 facilitates the later disassembly and replacement of the parts inside the valve body 1;
[0026] A pressure relief chamber 11 is provided inside the top of the valve body 1. The setting of the pressure relief chamber 11 can provide installation space and activity space for the piston head 6. A piston head 6 for blocking the pipe inlet 2 and the pressure relief pipe port 3 is slidably installed inside the valve body 1. The setting of the piston head 6 can block the pipe inlet 2 and the pressure relief pipe port 3 under normal pressure. The piston head 6 is in the pressure relief chamber 11 and is slidably connected to the pressure relief chamber 11; the pipe inlet 2 and the pressure relief pipe port 3 are connected to the pressure relief chamber 11; the piston head 6 is slidably connected to the sealing cover 4;
[0027] The diameter of the piston head 6 matches the diameter of the pressure relief chamber 11, and the thickness of the piston head 6 is greater than the diameter of the pressure relief pipe port 3, and the diameter of the piston head 6 is greater than the diameter of the pipe inlet 2; the depth of the pressure relief chamber 11 is twice the thickness of the piston head 6; the piston head 6 adopts existing technology, such as stainless steel, copper, aluminum and other materials in the existing technology; through the setting of the structure of the piston head 6, whether the pipe inlet 2 and the pressure relief pipe port 3 are blocked or not, it is possible to prevent the medium entering from the pipe inlet 2 from passing over the piston head 6 and entering the top of the piston head 6, that is, only the bottom surface of the piston head 6 is always in contact with the medium, thereby preventing the piston head 6 from being cavitated;
[0028] A core shaft 7 is fixedly installed inside the piston head 6. By setting the core shaft 7, the piston head 6 can be positioned to ensure the stability between the piston head 6 and the pressure-adjusting screw 5. The top end of the core shaft 7 is slidably installed with the pressure-adjusting screw 5. By setting the pressure-adjusting screw 5, the pressure applied by the compression spring 8 to the piston head 6 can be adjusted. The top end of the pressure-adjusting screw 5 extends out from the sealing cover 4 and is connected to the sealing cover 4 through a thread.
[0029] A compression spring 8 and a ring sleeve 12 are sleeved on the pressure-regulating screw 5, and are slidably connected with the compression spring 8 and the ring sleeve 12, and the ring sleeve 12 is at the top end of the compression spring 8, and the diameter of the ring sleeve 12 is larger than the diameter of the compression spring 8; through the setting of the compression spring 8 and the ring sleeve 12, the pressure value of the pressure relief of the piston head 6 can be controlled.
[0030] A threaded hole is provided through the center of the sealing cover 4, and a threaded sealing sleeve 10 is fixedly installed in the threaded hole. The arrangement of the threaded hole and the threaded sealing sleeve 10 can ensure the stability and sealing between the sealing cover 4 and the pressure regulating screw 5. A number of positioning columns 41 are evenly distributed and fixedly installed inside the sealing cover 4. The arrangement of the positioning columns 41 can limit the moving direction of the piston head 6 so that it can only slide straight up and down, thereby ensuring the stability of the piston head 6 during the pressure relief process; the positioning columns 41 are arranged in a circular array with the threaded hole as the center; the threaded sealing sleeve 10 is sleeved on the pressure regulating screw 5 and is threadedly connected to the pressure regulating screw 5; the positioning columns 41 are slidably connected to the piston head 6.
[0031] An axial cavity 51 is opened at the center of the bottom end of the pressure-regulating screw 5. The setting of the axial cavity 51 can provide displacement space for the core shaft 7 and ensure the stability between the pressure-regulating screw 5 and the core shaft 7. A locking nut 9 is fixedly installed on the pressure-regulating screw 5 by a thread, and the locking nut 9 is located outside the sealing cover 4; the top end of the core shaft 7 is in the axial cavity 51 and is slidably connected to the axial cavity 51; the length of the axial cavity 51 is greater than the length of the core shaft 7, and the inner diameter of the axial cavity 51 matches the diameter of the core shaft 7.
[0032] A plug 61 is fixedly installed at the bottom end of the piston head 6. Through the setting of the plug 61, the inlet 2 can be blocked when the pressure of the conveyed medium is normal, and a displacement chamber 62 is opened inside the piston head 6. Through the setting of the displacement chamber 62, the compression spring 8 and the ring sleeve 12 can be hidden to prevent the compression spring 8 and the ring sleeve 12 from contacting with the conveyed medium, thereby ensuring the safety of the compression spring 8 and the ring sleeve 12 and improving their service life. A limiting hole 63 is opened at the top of the piston head 6. Through the setting of the limiting hole 63, the moving direction of the pressure-regulating screw 5 can be limited, and the sealing between the pressure-regulating screw 5 and the pressure-regulating screw 5 can be ensured to prevent the medium from entering the displacement chamber 62; the limiting hole 63 is connected to the displacement chamber 62; one end of the piston head 6 is evenly provided with a plurality of limiting cavities 64, which are The cavity 64 cooperates with the setting of the positioning column 41 to ensure the stability and smoothness of the movement of the piston head 6, and the limiting cavity 64 is arranged in a ring array with the displacement cavity 62 as the center; a nut 65 is fixedly installed at the bottom of the displacement cavity 62 inside the piston head 6, and the setting of the nut 65 facilitates the disassembly and assembly of the pressure-regulating screw 5 in the later stage; the bottom end of the core shaft 7 is fixedly installed in the nut 65 through the limiting hole 63; the bottom end of the pressure-regulating screw 5 extends into the displacement cavity 62 through the limiting hole 63, and the pressure-regulating screw 5 is slidably connected with the limiting hole 63 and the displacement cavity 62; the bottom end of the positioning column 41 extends into the corresponding limiting cavity 64, and is slidably connected with the corresponding limiting cavity 64; the plug 61 is blocked in the pipe inlet 2, and is slidably connected with the pipe inlet 2; the compression spring 8 and the ring sleeve 12 are in the displacement cavity 62;
[0033] The diameter of the plug 61 matches the inner diameter of the pipe inlet 2 ; the inner diameter of the displacement cavity 62 is larger than the inner diameter of the limiting hole 63 , and the inner diameter of the limiting hole 63 matches the diameter of the core shaft 7 ; the diameter of the ring sleeve 12 is smaller than the inner diameter of the limiting hole 63 .
[0034] A sealing gasket is fixedly installed between the valve body 1 and the sealing cover 4 .
[0035] It should be noted that when the plug 61 is normally sealed in the pipe inlet 2 , the top end of the core shaft 7 is in the shaft cavity 51 , and the bottom end of the positioning column 41 is in the corresponding limiting cavity 64 .
[0036] In this embodiment, when in use, the valve body 1 is installed in the required pipeline through the pipe inlet 2 and the pressure relief pipe outlet 3, and then the pressure relief value is adjusted according to the demand. When adjusting, the pressure regulating screw 5 is rotated clockwise, so that the pressure regulating screw 5 drives the ring sleeve 12 to move down along the core shaft 7, thereby forcing the compression spring 8 to compress, and then pressure is applied to the piston head 6, so that the plug 61 is effectively blocked in the pipe inlet 2, and vice versa, the pressure value of the compression spring 8 is reduced until it is adjusted to the required pressure relief pressure value;
[0037] In this way, when the pressure of the medium transported in the pipeline is greater than the pressure of the compression spring 8, the medium will push up the plug 61 and the piston head 6 through the pipe inlet 2, so that the pressure relief pipe port 3 is opened, and the pressure is relieved through the pressure relief pipe port 3;
[0038] When leakage occurs between the plug 61 and the pipe inlet 2 at a later stage, due to the setting of the piston head 6, the pipe inlet 2 and the pressure relief pipe port 3 can continue to be blocked, or the pipe inlet 2 and the pressure relief pipe port 3 can be opened to relieve pressure, thereby making the whole safer and more reliable.
[0039] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.
Claims
1. An anti-cavitation high-sensitivity pressure relief safety valve, characterized by: The invention comprises a valve body (1), wherein: a pipe inlet (2) is provided at the bottom end of the valve body (1), and a pressure relief pipe outlet (3) is provided at one side of the valve body (1), and the pipe inlet (2) and the pressure relief pipe outlet (3) are connected to the inside of the valve body (1); a sealing cover (4) is fixedly mounted on the top end of the valve body (1) by means of bolts; A pressure relief chamber (11) is provided inside the top end of the valve body (1), and a piston head (6) for sealing the pipe inlet (2) is slidably installed inside the valve body (1), the piston head (6) is in the pressure relief chamber (11) and is slidably connected to the pressure relief chamber (11); the pipe inlet (2) and the pressure relief pipe port (3) are in communication with the pressure relief chamber (11); the piston head (6) is slidably connected to the sealing cover (4); A core shaft (7) is fixedly mounted inside the piston head (6), and a pressure regulating screw (5) is slidably mounted on the top end of the core shaft (7). The top end of the pressure regulating screw (5) extends out of the sealing cover (4) and is connected to the sealing cover (4) via a thread. The pressure regulating screw rod (5) is sleeved with a compression spring (8) and a ring sleeve (12), and is slidably connected between the compression spring (8) and the ring sleeve (12), and the ring sleeve (12) is located at the top end of the compression spring (8).
2. The anti-cavitation high-sensitivity pressure relief safety valve according to claim 1, characterized in that: The sealing cover (4) is provided with a threaded hole through which a threaded sealing sleeve (10) is fixedly installed; a plurality of positioning columns (41) are evenly distributed and fixedly installed inside the sealing cover (4); the threaded sealing sleeve (10) is sleeved on the pressure regulating screw (5) and is threadedly connected to the pressure regulating screw (5); the positioning column (41) is slidably connected to the piston head (6).
3. The anti-cavitation high-sensitivity pressure relief safety valve according to claim 2, characterized in that: The bottom end of the pressure regulating screw (5) is provided with an axial cavity (51), and a locking nut (9) is fixedly mounted on the pressure regulating screw (5) by means of a thread, and the locking nut (9) is located outside the sealing cover (4); the top end of the core shaft (7) is located in the axial cavity (51) and is slidably connected to the axial cavity (51).
4. The anti-cavitation high-sensitivity pressure relief safety valve according to claim 3, characterized in that: A plug (61) is fixedly mounted on the bottom end of the piston head (6), and a displacement cavity (62) is provided inside the piston head (6). A limiting hole (63) is provided on the top end of the piston head (6); the limiting hole (63) is communicated with the displacement cavity (62); a plurality of limiting cavities (64) are evenly distributed on one end of the piston head (6); a nut (65) is fixedly mounted on the bottom of the displacement cavity (62) inside the piston head (6); the bottom end of the core shaft (7) is fixedly mounted on the nut (65) through the limiting hole (63); 5); the bottom end of the pressure regulating screw (5) extends into the displacement cavity (62) through the limiting hole (63), and the pressure regulating screw (5) is slidably connected to the limiting hole (63) and the displacement cavity (62); the bottom end of the positioning column (41) extends into the corresponding limiting cavity (64) and is slidably connected to the corresponding limiting cavity (64); the plug (61) is sealed in the pipe inlet (2) and is slidably connected to the pipe inlet (2); the compression spring (8) and the ring sleeve (12) are in the displacement cavity (62).
5. The anti-cavitation high-sensitivity pressure relief safety valve according to claim 1, characterized in that: A sealing gasket is fixedly installed between the valve body (1) and the sealing cover (4).