Internal and external sealing structure of piston rod of spring type reset safety valve

Abstract

The utility model discloses an internal and external sealing structure of a piston rod of a spring type reset safety valve. The internal and external sealing structure comprises a valve body, a first mounting seat, a first positioning ring, a through hole, a second mounting seat, a second positioning ring, a first V-shaped sealing ring, a first O-shaped sealing ring, a sealing cover, a second O-shaped sealing ring and a recoil disc, a double-sealing structure is designed inside and outside the recoil disc, air tightness of the valve can be improved, the first V-shaped sealing ring is fixed through the sealing cover, the second V-shaped sealing ring is fixed through the gasket and the gland, deformation of the sealing structure can be avoided, safety of the valve is effectively improved, and the service life of the valve is prolonged. Meanwhile, an outer chamfer is designed on the recoil disc, so that the first V-shaped sealing ring cannot be extruded and deformed when the recoil disc is reset; the graphite sleeve is additionally arranged on the piston rod, so that the movement lubricity of the piston rod can be improved, blockage is avoided, and normal work of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to an inner and outer sealing structure of a piston rod of a spring-type reset safety valve. Background Art

[0002] The spring-type reset safety valve uses the force of the compression spring to balance the force acting on the valve disc. The compression of the spiral coil spring can be adjusted by turning the adjusting nut on it. This structure can be used to correct the opening (setting) pressure of the safety valve as needed. The spring micro-opening safety valve has a light and compact structure, high sensitivity, and is not restricted in the installation position. Moreover, because it is less sensitive to vibration, it can be used on mobile pressure vessels. The existing spring-type reset safety valve has the following defects when in use: First, the valve core adopts an internal sealing design, that is, the recoil disc is covered on the flow channel at the input end of the valve body, and the valve disc on the recoil disc is used to close the flow channel. This design has the problem of poor air tightness, and the sealing structure is prone to deformation and failure, resulting in reduced safety and service life of the valve; second, the movement of the piston rod is prone to jamming, which affects the normal operation of the valve. Utility Model Content

[0003] The utility model aims to provide an inner and outer sealing structure of a piston rod of a spring-type reset safety valve to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an inner and outer sealing structure of a spring-type reset safety valve piston rod, comprising a valve body, a first mounting seat being threadedly connected inside the valve body, a first positioning ring being fixedly connected to the upper surface of the first mounting seat, a first V-shaped sealing ring being sleeved on the first positioning ring, a sealing cover being sleeved on the first V-shaped sealing ring, and the sealing cover being fixed in the valve body by pressing the first mounting seat, a second mounting seat being arranged inside the first positioning ring, and the second mounting seat being fixedly connected to the upper surface of the first mounting seat, a second positioning ring being fixedly connected to the upper surface of the second mounting seat, a second positioning ring being sleeved on the second positioning ring, a gasket being arranged on the top of the second V-shaped sealing ring, a pressure cover being sleeved in the gasket, and the pressure cover being threadedly connected to the upper surface of the second mounting seat, a recoil disc being sleeved on the second mounting seat, and the recoil disc being sleeved in the first V-shaped sealing ring.

[0005] Preferably, a first flow channel is opened on the valve body, a second flow channel is opened on an inner wall of one side of the first flow channel, the first mounting seat is threadedly connected in the first flow channel, and the recoil disc is slidably connected in the first flow channel.

[0006] Preferably, the upper surface of the recoil disc is fixedly connected with a piston rod body, a graphite sleeve is sleeved on the piston rod body, a plurality of grooves are provided on the inner wall of the graphite sleeve, a buffer cover is sleeved on the graphite sleeve, and the buffer cover is sleeved in the first flow channel.

[0007] Preferably, a guide sleeve is provided at the top end of the graphite sleeve, a sealing sleeve is sleeved inside the guide sleeve, and the sealing sleeve is sleeved on the piston rod body.

[0008] Preferably, a fourth O-ring is sleeved on the guide sleeve, and the fourth O-ring is sleeved in the first flow channel.

[0009] Preferably, a plurality of through holes are formed on the upper surface of the first mounting seat, and the through holes are distributed on the outer side of the second mounting seat.

[0010] Preferably, a second O-ring is sleeved on the sealing cover, and the second O-ring is sleeved in the first flow channel, a first O-ring is sleeved in the sealing cover, and the first O-ring is sleeved on the first V-ring.

[0011] Preferably, a third O-ring is sleeved inside the second V-ring, and the third O-ring is sleeved on the second mounting seat.

[0012] Preferably, the lower surface of the recoil disc is provided with an outer chamfer, and the upper surface of the first mounting seat is provided with an inner chamfer at a position corresponding to the outer chamfer.

[0013] The utility model provides a spring-type reset safety valve piston rod inner and outer sealing structure, the advantages of which are: the utility model is designed with double sealing structures inside and outside the recoil disk, which can improve the air tightness of the valve; the utility model fixes the first V-shaped sealing ring through a sealing cover, and fixes the second V-shaped sealing ring through a gasket and a pressure cover, which can avoid deformation of the sealing structure, effectively improve the safety of the valve, and extend the service life of the valve; at the same time, by designing an outer chamfer on the recoil disk, the first V-shaped sealing ring will not be squeezed and deformed when it is reset; the utility model can improve the lubricity of the piston rod movement and avoid jamming by adding a graphite sleeve on the piston rod, thereby ensuring the normal operation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is an exploded view of the overall structure of the utility model;

[0016] Figure 2 for Figure 1 A magnified view of the structure in the middle A area;

[0017] Figure 3It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the overall side cutaway structure of the utility model;

[0019] Figure 5 for Figure 4 A magnified view of the structure in the middle B area;

[0020] Figure 6 for Figure 4 A magnified view of the structure of the middle C region.

[0021] In the figure: 1. valve body; 11. first flow channel; 12. second flow channel; 2. first mounting seat; 21. first positioning ring; 22. through hole; 23. second mounting seat; 24. second positioning ring; 25. inner chamfer; 3. first V-shaped sealing ring; 31. first O-shaped sealing ring; 32. sealing cover; 33. second O-shaped sealing ring; 4. second V-shaped sealing ring; 41. third O-shaped sealing ring; 42. gasket; 43. gland; 5. recoil plate; 51. piston rod body; 52. outer chamfer; 6. buffer cover; 7. guide sleeve; 71. sealing sleeve; 72. fourth O-shaped sealing ring; 8. graphite sleeve; 81. groove. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-6The utility model provides an embodiment: a spring-type reset safety valve piston rod internal and external sealing structure, including a valve body 1, a first mounting seat 2 is connected to the valve body 1 through internal threads, a first positioning ring 21 is fixedly connected to the upper surface of the first mounting seat 2, a first V-shaped sealing ring 3 is sleeved on the first positioning ring 21, a sealing cover 32 is sleeved on the first V-shaped sealing ring 3, and the sealing cover 32 is fixed in the valve body 1 through the first mounting seat 2 by pressing, a second mounting seat 23 is arranged in the first positioning ring 21, and the second mounting seat 23 is fixedly connected to the upper surface of the first mounting seat 2, a second positioning ring 24 is fixedly connected to the upper surface of the second mounting seat 23, a second V-shaped sealing ring 4 is sleeved on the second positioning ring 24, and the top of the second V-shaped sealing ring 4 is arranged A gasket 42 is provided, a pressure cap 43 is sleeved inside the gasket 42, and the pressure cap 43 is threadedly connected to the upper surface of the second mounting seat 23, a recoil disc 5 is sleeved on the second mounting seat 23, and the recoil disc 5 is sleeved in the first V-shaped sealing ring 3, the first V-shaped sealing ring 3 is used to seal the outside of the recoil disc 5, the second V-shaped sealing ring 4 is used to seal the inside of the recoil disc 5, the sealing cover 32 is used to cooperate with the first positioning ring 21 to limit the first V-shaped sealing ring 3, the gasket 42 and the pressure cap 43 are used to cooperate with the second positioning ring 24 to limit the second V-shaped sealing ring 4, the internal and external sealing structure can improve the sealing performance and safety, prevent the sealing structure from deformation, and extend the service life; the valve body 1 is provided with a first flow channel 11, the first flow channel A second flow channel 12 is provided on the inner wall of one side of 11, and the first mounting seat 2 is threadedly connected to the first flow channel 11, and the recoil plate 5 is slidably connected to the first flow channel 11, the first flow channel 11 is an inlet flow channel, and the second flow channel 12 is an outlet flow channel; a piston rod body 51 is fixedly connected to the upper surface of the recoil plate 5, a graphite sleeve 8 is sleeved on the piston rod body 51, a plurality of grooves 81 are provided on the inner wall of the graphite sleeve 8, a buffer cover 6 is sleeved on the graphite sleeve 8, and the buffer cover 6 is sleeved in the first flow channel 11, the buffer cover 6 is used to buffer the recoil plate 5, the graphite sleeve 8 can improve the lubricity of the movement with the piston rod body 51, the groove 81 is used to reduce the contact area between the graphite sleeve 8 and the piston rod body 51, so as to reduce the friction, and the activity The plug rod body 51 is used to connect the recoil disc 5 and the elastic device of the safety valve; a guide sleeve 7 is provided at the top of the graphite sleeve 8, a sealing sleeve 71 is sleeved in the guide sleeve 7, and the sealing sleeve 71 is sleeved on the piston rod body 51, the guide sleeve 7 is used to guide the piston rod body 51, and the sealing sleeve 71 is used to improve the sealing between the piston rod body 51 and the guide sleeve 7; a fourth O-type sealing ring 72 is sleeved on the guide sleeve 7, and the fourth O-type sealing ring 72 is sleeved in the first flow channel 11, and the fourth O-type sealing ring 72 is used to improve the sealing between the guide sleeve 7 and the first flow channel 11; a plurality of through holes 22 are opened on the upper surface of the first mounting seat 2, and the through holes 22 are distributed and arranged on the outside of the second mounting seat 23, and the through holes 22 are used for fluid circulation;The sealing cover 32 is sleeved with a second O-ring 33, and the second O-ring 33 is sleeved in the first flow channel 11. The sealing cover 32 is sleeved with a first O-ring 31, and the first O-ring 31 is sleeved on the first V-shaped sealing ring 3. The second O-ring 33 is used to improve the sealing performance between the sealing cover 32 and the first flow channel 11, and the first O-ring 31 is used to improve the sealing performance between the sealing cover 32 and the first V-shaped sealing ring 3; the second V-shaped sealing ring 4 is sleeved with a third O-ring 41, and The third O-ring 41 is sleeved on the second mounting seat 23, and the third O-ring 41 is used to improve the sealing between the second V-ring 4 and the second mounting seat 23; the lower surface of the recoil disc 5 is provided with an outer chamfer 52, and the upper surface of the first mounting seat 2 is provided with an inner chamfer 25 at a position corresponding to the outer chamfer 52. The outer chamfer 52 allows the recoil disc 5 to be accurately inserted into the first V-ring 3 when resetting, avoiding deformation of the first V-ring 3, and the inner chamfer 25 is used to cooperate with the outer chamfer 52 to improve air tightness. ;

[0024] Working principle: When assembling and using the utility model, firstly, the first O-ring 31 is sleeved on the first V-ring 3, the second O-ring 33 is sleeved on the sealing cover 32, and then the first V-ring 3 is installed on the first positioning ring 21, the sealing cover 32 is installed on the first V-ring 3, the third O-ring 41 is sleeved in the second V-ring 4, the second V-ring 4 is sleeved on the second positioning ring 24, the gasket 42 is placed on the second V-ring 4, the pressure cover 43 is installed on the second mounting seat 23, the gasket 42 and the third O-ring 41 are pressed, and then the first mounting seat 2 is installed into the valve body 1 from the bottom end of the first flow channel 11, so that the sealing cover 32 is pressed together. In the first flow channel 11; the recoil disc 5 is installed into the valve body 1 from the top of the first flow channel 11, the graphite sleeve 8 is installed in the buffer cover 6, the buffer cover 6 is sleeved on the piston rod body 51 and installed in the first flow channel 11, the sealing sleeve 71 and the fourth O-ring 72 are installed on the guide sleeve 7, and the guide sleeve 7 is installed on the piston rod body 51; wherein, the second flow channel 12 is used for pressure relief, and the through hole 22 is used for fluid circulation; the outer chamfer 52 can enable the recoil disc 5 to be accurately inserted into the first V-shaped sealing ring 3 when resetting, avoiding deformation of the first V-shaped sealing ring 3, and the inner chamfer 25 is used to cooperate with the outer chamfer 52 to improve air tightness; the graphite sleeve 8 can improve the lubricity of the movement of the piston rod body 51.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A spring-type reset safety valve piston rod inner and outer sealing structure, comprising a valve body (1), characterized in that: The valve body (1) is internally threadedly connected to a first mounting seat (2), a first positioning ring (21) is fixedly connected to the upper surface of the first mounting seat (2), a first V-shaped sealing ring (3) is sleeved on the first positioning ring (21), a sealing cover (32) is sleeved on the first V-shaped sealing ring (3), and the sealing cover (32) is fixed in the valve body (1) by pressing the first mounting seat (2), a second mounting seat (23) is arranged in the first positioning ring (21), and the second mounting seat (23) is fixedly connected to the first mounting seat (21). The upper surface of the mounting seat (2) and the upper surface of the second mounting seat (23) are fixedly connected with a second positioning ring (24), a second V-shaped sealing ring (4) is sleeved on the second positioning ring (24), a gasket (42) is arranged at the top end of the second V-shaped sealing ring (4), a pressure cover (43) is sleeved inside the gasket (42), and the pressure cover (43) is threadedly connected to the upper surface of the second mounting seat (23), a recoil disc (5) is sleeved on the second mounting seat (23), and the recoil disc (5) is sleeved inside the first V-shaped sealing ring (3).

2. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 1 is characterized in that: The valve body (1) is provided with a first flow channel (11), a second flow channel (12) is provided on an inner wall of one side of the first flow channel (11), the first mounting seat (2) is threadedly connected in the first flow channel (11), and the recoil disc (5) is slidably connected in the first flow channel (11).

3. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 2 is characterized in that: The upper surface of the recoil disc (5) is fixedly connected to a piston rod body (51), a graphite sleeve (8) is sleeved on the piston rod body (51), a plurality of grooves (81) are provided on the inner wall of the graphite sleeve (8), a buffer cover (6) is sleeved on the graphite sleeve (8), and the buffer cover (6) is sleeved in the first flow channel (11).

4. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 3 is characterized in that: A guide sleeve (7) is arranged at the top end of the graphite sleeve (8), a sealing sleeve (71) is sleeved inside the guide sleeve (7), and the sealing sleeve (71) is sleeved on the piston rod body (51).

5. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 4 is characterized in that: A fourth O-type sealing ring (72) is sleeved on the guide sleeve (7), and the fourth O-type sealing ring (72) is sleeved in the first flow channel (11).

6. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 1 is characterized in that: A plurality of through holes (22) are provided on the upper surface of the first mounting seat (2), and the through holes (22) are distributed on the outer side of the second mounting seat (23).

7. The inner and outer sealing structure of the piston rod of the spring-type return safety valve according to claim 1 is characterized in that: The sealing cover (32) is sleeved with a second O-type sealing ring (33), and the second O-type sealing ring (33) is sleeved in the first flow channel (11); the sealing cover (32) is sleeved with a first O-type sealing ring (31), and the first O-type sealing ring (31) is sleeved on the first V-shaped sealing ring (3).

8. The inner and outer sealing structure of the piston rod of a spring-type return safety valve according to claim 1, characterized in that: A third O-shaped sealing ring (41) is sleeved inside the second V-shaped sealing ring (4), and the third O-shaped sealing ring (41) is sleeved on the second mounting seat (23).

9. The inner and outer sealing structure of the piston rod of a spring-type return safety valve according to claim 1, characterized in that: The lower surface of the recoil disc (5) is provided with an outer chamfer (52), and the upper surface of the first mounting seat (2) is provided with an inner chamfer (25) at a position corresponding to the outer chamfer (52).

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