Safety valve

Abstract

The utility model provides a safety valve, and belongs to the field of valves. The problem that pressure relief and water seepage are prone to occurring at the joint of an existing safety valve and a pipeline is solved. The safety valve comprises a valve body with a pressure relief opening, the pressure relief opening of the valve body is connected with a pipeline, the pressure relief opening of the valve body is connected with the pipeline in a matched mode through internal threads and external threads, a sealing structure is arranged in front of the connecting position of the pressure relief opening and the pipeline and comprises a connecting piece, a lining and a sealing piece, and a sealing ring groove is formed in the pressure relief opening of the valve body. The lining and the sealing piece are sequentially arranged outside the connecting piece in a sleeving mode, a limiting groove is formed in the groove bottom of the sealing ring groove, the outer portion of the connecting piece and the corresponding side wall of the sealing ring groove are of an inclined structure, the inner portion and the outer portion of the sealing piece both extend outwards in the radial direction to form a plurality of sealing folded edges, and extrusion ring grooves are formed in the outer portion of the lining and the corresponding side wall of the sealing ring groove. The cross sections of the sealing folded edges are matched in an arc structure, and the sealing folded edges and the extrusion ring grooves are mutually extruded and filled to form extrusion sealing. The sealing structure has the advantage of high sealing performance.

Description

Technical Field

[0001] The utility model belongs to the field of valves and relates to a safety valve. Background Art

[0002] The safety valve is applied to safety protection devices of various systems such as heating, refrigeration, and domestic water. When the system pressure increases and exceeds the discharge pressure of the safety valve, the safety valve automatically opens to relieve pressure and release the medium to protect the safety of pipelines and equipment in the system: when the system pressure is lower than the reseating pressure of the safety valve, it automatically closes.

[0003] The structure design of the existing safety valve is relatively simple. Among them, the connection structure between the pressure relief port of the safety valve and the pipeline usually adopts an internal and external thread matching structure, and the sealing strength is relatively low, resulting in problems such as water seepage and leakage at the connection during the pressure relief of the safety valve, seriously affecting the service life of the safety valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mounting valve to solve the above problems for the problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A safety valve includes a valve body with a pressure relief port. The pressure relief port of the valve body is connected with a pipeline, and the pressure relief port of the valve body is connected with the pipeline through internal and external thread matching. It is characterized in that a sealing structure with high strength sealing is arranged before the connection between the pressure relief port and the pipeline;

[0006] The sealing structure includes a connecting piece for sealing connection, a bushing for improving the sealing strength, and a sealing member for sealing;

[0007] A sealing ring groove matched with the connecting piece is arranged inside the pressure relief port of the valve body;

[0008] The connecting piece is fixedly connected to the end of the pipeline and is matched with the sealing ring groove;

[0009] The bushing and the sealing member are sequentially sleeved outside the connecting piece and are located in the sealing ring groove;

[0010] A limiting groove matched with the end of the connecting piece is arranged at the bottom of the sealing ring groove;

[0011] The side wall of the outside of the connecting piece corresponding to the sealing ring groove is arranged in an inclined structure;

[0012] A plurality of sealing flanges for improving sealing extend radially outwards both inside and outside the sealing member, and extrusion ring grooves for extrusion cooperation with the sealing flanges are arranged on the side walls of the outside of the bushing corresponding to the sealing ring groove;

[0013] The cross-section of the sealing flange is in an arc structure for cooperation, and is extruded with the extrusion ring groove to form an extrusion seal.

[0014] In the above-mentioned safety valve, a plurality of the sealing flanges are sequentially arranged at intervals in the axial direction of the side wall of the seal, inside and outside the seal, and are respectively in extrusion fit with the extrusion grooves corresponding to the side walls outside the shaft sleeve and the seal ring groove.

[0015] In the above-mentioned safety valve, the cross-sections of the bushing and the seal are trapezoidal structures, and are consistent with the inclination directions of the outside of the connecting member and the side wall of the seal ring groove.

[0016] In the above-mentioned safety valve, the ends of the connecting member and the bushing are in limit fit with the limit groove for radial limitation of the bushing. The seal is continuously screwed and fitted through the internal and external threads of the pipeline and the pressure relief port of the valve body, so that the sealing flanges on the seal are continuously extruded and deformed, and are extruded and fitted against the corresponding side surfaces of the extrusion groove to form a multi-layer extrusion sealing structure.

[0017] Compared with the prior art, the structure of this safety valve is simply designed. By using the sealing structure design at the connection between the pressure relief port of the valve body and the pipeline, multi-layer extrusion sealing can be formed, effectively improving the sealing strength at the connection between the pressure relief port of the valve body and the pipeline, and preventing situations such as pressure relief and water leakage. Brief Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of this safety valve.

[0019] Figure 2 is a partial sectional structural schematic diagram of this safety valve.

[0020] Figure 3 is Figure 2 an enlarged structural schematic diagram at position A in

[0021] In the figure, 1, valve body; 2, pressure relief port; 3, pipeline; 4, connecting member; 5, bushing; 6, seal; 7, seal ring groove; 8, limit groove; 9, sealing flange; 10, extrusion groove. Detailed Description of the Embodiment

[0022] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0023] Such as Figure 1 , Figure 2 , Figure 3As shown in the figure, this safety valve includes a valve body 1 with a pressure relief port 2. A pipeline 3 is connected to the pressure relief port 2 of the valve body 1. The pressure relief port 2 of the valve body 1 and the pipeline 3 are connected by internal and external thread fitting. Before the connection between the pressure relief port 2 and the pipeline 3, a highly sealed structure is provided. The sealing structure includes a connecting piece 4 for sealed connection, a bushing 5 for improving the sealing strength, and a sealing element 6 for sealing. Inside the pressure relief port 2 of the valve body 1, a sealing ring groove 7 is provided which cooperates with the connecting piece 4. The connecting piece 4 is fixedly connected to the end of the pipeline 3 and cooperates with the sealing ring groove 7. The bushing 5 and the sealing element 6 are sequentially sleeved outside the connecting piece 4 and are located in the sealing ring groove 7. At the bottom of the sealing ring groove 7, a limiting groove 8 is provided which cooperates with the end of the connecting piece 4. The outer part of the connecting piece 4 and the corresponding side walls of the sealing ring groove 7 are arranged in an inclined structure. Radially outwardly extending from both the inside and outside of the sealing element 6 are a number of sealing flanges 9 for improving the seal. On the outer part of the bushing 5 and the corresponding side walls of the sealing ring groove 7, extrusion ring grooves 10 are provided which are in extrusion fit with the sealing flanges 9. The cross-section of the sealing flanges 9 is in an arc structure and forms an extrusion seal by mutual extrusion filling with the extrusion ring grooves 10.

[0024] The structure of this safety valve is simply designed. By using the sealing structure design at the connection between the pressure relief port 2 of the valve body 1 and the pipeline 3, multiple layers of extrusion seals can be formed, effectively improving the sealing strength at the connection between the pressure relief port 2 of the valve body 1 and the pipeline 3 and preventing situations such as pressure relief and water leakage.

[0025] Working principle

[0026] The piston inside the safety valve closes the valve seat under the action of the spring tension. After the system pressure is greater than the spring-set tension, the piston moves upward away from the valve seat, opening the water discharge channel. The set pressure of the safety valve is the maximum working pressure allowed by the system. When the system pressure is lower than the closing pressure of the safety valve, the tension acting on the upper part of the piston by the spring closes the water flow channel, and the system resumes normal operation. The diameter of the pressure relief port of the safety valve is equal to or greater than the diameter of the water inlet, so that rapid pressure relief can be achieved. At the same time, by using the sealing structure design, the situation of pressure relief and water leakage between the pressure relief port 2 and the pipeline 3 during the pressure relief process can be effectively solved.

[0027] To elaborate further, a number of sealing flanges 9 are sequentially arranged at intervals along the axial direction of the side wall of the sealing element 6 inside and outside the sealing element 6 and are respectively in extrusion fit with the extrusion ring grooves 10 on the outer part of the bushing and the corresponding side walls of the sealing ring groove 7.

[0028] To elaborate further, the cross-sections of the bushing 5 and the sealing element 6 are arranged in a trapezoidal structure and are consistent with the inclination direction of the outer part of the connecting piece 4 and the side walls of the sealing ring groove 7.

[0029] Specifically, the end of the connecting member 4 and the end of the bushing 5 are in mutual limiting cooperation with the limiting groove 8 for the radial limiting of the bushing 5. The seal 6 is continuously screwed and fitted through the internal and external threads of the pipeline 3 and the pressure relief port 2 of the valve body 1, so that the sealing flange 9 on the seal 6 is continuously squeezed and deformed, and is squeezed and fitted to the corresponding side of the extrusion ring groove 10 to form a multi-layer extrusion sealing structure.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although this article uses more terms, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A safety valve, comprising a valve body (1) with a pressure relief port (2), a pipe (3) is connected to the pressure relief port (2) of the valve body (1), the pressure relief port (2) of the valve body (1) and the pipe (3) are connected by internal and external thread fitting, characterized in that, Before the connection between the pressure relief port (2) and the pipeline (3), a sealing structure with high-strength sealing is provided; The sealing structure includes a connecting piece (4) for sealing connection, a bushing (5) for improving the sealing strength, and a sealing element (6) for sealing; Inside the pressure relief port (2) of the valve body (1), a sealing ring groove (7) matching with the connecting piece (4) is provided; The connecting piece (4) is fixedly connected to the end of the pipeline (3) and cooperates with the sealing ring groove (7); The bushing (5) and the sealing element (6) are sequentially sleeved outside the connecting piece (4) and are located in the sealing ring groove (7); At the bottom of the sealing ring groove (7), a limiting groove (8) matching with the end of the connecting piece (4) is provided; The outer sidewall of the connecting piece (4) and the corresponding sidewall of the sealing ring groove (7) are arranged in an inclined structure; On both the inner and outer sides of the sealing element (6), a plurality of sealing flanges (9) for improving sealing extend radially outward. On the outer sidewall of the bushing (5) and the corresponding sidewall of the sealing ring groove (7), extrusion ring grooves (10) for extrusion cooperation with the sealing flanges (9) are provided; The cross-section of the sealing flange (9) is in an arc structure and forms an extrusion seal by mutual extrusion filling with the extrusion ring groove (10); 2. The safety valve according to claim 1, characterized in that, A plurality of the sealing flanges (9) are sequentially arranged at intervals along the axial direction of the sidewall of the sealing element (6) inside and outside the sealing element (6), and respectively cooperate with the extrusion ring grooves (10) on the outer side of the bushing and the corresponding sidewall of the sealing ring groove (7) by mutual extrusion; 3. A safety valve according to claim 1, characterized in that, The cross-sections of the bushing (5) and the sealing element (6) are arranged in a trapezoidal structure and are consistent with the inclination direction of the outer side of the connecting piece (4) and the sidewall of the sealing ring groove (7); 4. A safety valve according to claim 1, characterized in that, The end of the connecting piece (4) and the end of the bushing (5) are mutually limited and cooperate for the radial limitation of the bushing (5). The sealing element (6) is continuously screwed and tightened through the internal and external threads of the pipeline (3) and the pressure relief port (2) of the valve body (1), so that the sealing flanges (9) on the sealing element (6) are continuously extruded and deformed, and are extruded and fitted to the corresponding side surfaces of the extrusion ring grooves (10) to form a multi-layer extrusion sealing structure.

Images