Safety valve with set pressure capable of being adjusted in graded mode

Abstract

The utility model relates to a safety valve for setting pressure grading adjustment, which comprises a valve body unit, a valve clack unit, a valve rod and an elastic unit, the elastic unit comprises a spring seat assembly, a spring assembly and an adjusting assembly which are sleeved on the valve rod, and the spring seat assembly comprises a lower spring seat; the spring assembly comprises an outer spring and an inner spring, and the lower ends of the outer spring and the inner spring are supported on the lower spring seat; the adjusting assembly comprises an outer adjusting piece and an inner adjusting piece, the outer adjusting piece is connected to the valve body unit, the upper end of the outer spring abuts against the outer adjusting piece, the inner adjusting piece is connected to the outer adjusting piece, and the upper end of the inner spring abuts against the inner adjusting piece. Mutual influence among the springs is reduced while setting pressure of the valve is improved, and assembly efficiency and stability are improved while adjustment is facilitated. The safety valve meets the higher pressure requirement, and the use pressure range of the safety valve under the special working condition is expanded; and the wire diameter of a single spring is reduced, non-standard structures are reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, relates to a safety valve, and particularly relates to a safety valve with stepwise adjustment of set pressure. Background Technique

[0002] The spring-loaded safety valve is a safety valve that works by relying on the spring force. The performance of the spring determines the performance of the spring-loaded safety valve. Therefore, the spring is also one of the most important parts of the safety valve. Generally, the material, size and other parameters of the spring are selected according to the working conditions of the safety valve. Through the working conditions of the safety valve and the requirements of customers, the material of the spring is first determined; after the material is determined, the wire diameter, height, mean diameter, stiffness and other parameters of the spring are determined through calculation. The existing spring-loaded safety valves generally use a single spring. This structure is relatively simple and mature, which is beneficial to the adjustment of the performance of the safety valve. As Figure 1 shown. The wire diameter of the spring is an important index related to the spring stiffness. Springs made of different materials can produce different maximum wire diameters.

[0003] However, the single-spring structure also has deficiencies. When the structural dimensions of the safety valve are limited and the wire diameter of the spring material cannot meet the requirements, it is impossible to achieve with a single spring. For example, for austenitic stainless steel materials, the maximum wire diameter that the spring can reach generally does not exceed 40 mm. Therefore, for some special materials (such as INCONEL, 316, etc.), it is very difficult to meet the performance requirements of the safety valve through the calculation of a single spring; at this time, the size of the valve cover is generally increased to expand the spring specification to achieve a higher set pressure. Although increasing the size of the valve cover can solve some problems of higher set pressure, it will cause many non-standard structures, and the upper part is too large, affecting the seismic performance of the valve structure, and the safety cannot be guaranteed.

[0004] Referring to the patent with the publication number CN208107249U, it discloses a safety valve with a double-spring structure. A first spring and a second spring are arranged inside and outside between the upper spring seat and the lower spring seat. Through the arrangement of the two springs inside and outside, the internal space of the valve cover is fully utilized. By sharing the medium pressure by the two springs, the force on a single spring is reduced, and the wire diameter of a single spring is reduced while ensuring the original structural dimensions. However, when adjusting the set pressure, the two springs are adjusted simultaneously, and the adjustment accuracy and flexibility are relatively low; at the same time, when assembling, two springs need to be installed simultaneously, with high assembly requirements and low efficiency. Summary of the Invention

[0005] The purpose of the utility model is to provide a safety valve with stepwise adjustment of set pressure.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0007] A safety valve with step - regulated setting pressure, comprising a valve body unit, a valve flap unit, a valve stem and an elastic unit. The lower end of the valve stem is engaged with the valve flap unit, and the elastic unit provides an elastic force for the valve stem to move and drive the valve flap unit to close the valve body unit.

[0008] The elastic unit includes a spring seat assembly, a spring assembly and an adjustment assembly. The spring seat assembly, the spring assembly and the adjustment assembly are sleeved on the valve stem. The spring seat assembly includes a lower spring seat; the spring assembly includes an outer spring and an inner spring. The outer spring is located on the outer periphery of the inner spring, and the lower ends of the outer spring and the inner spring are supported on the lower spring seat; the adjustment assembly includes an outer adjuster and an inner adjuster. The outer adjuster is adjustably connected to the valve body unit, the upper end of the outer spring abuts against the outer adjuster, the inner adjuster is adjustably connected to the outer adjuster, and the upper end of the inner spring abuts against the inner adjuster.

[0009] Preferably in the above - mentioned technical solution, the spring seat assembly further includes an upper spring seat. The upper end of the inner spring abuts against the lower end face of the upper spring seat, and the upper end face of the upper spring seat abuts against the inner adjuster.

[0010] More preferably, the lower end face of the upper spring seat has a protruding upper spring seat protrusion. The upper end of the inner spring is sleeved on the outer periphery of the upper spring seat protrusion, and the upper end of the inner spring can be fixed by the upper spring seat protrusion.

[0011] More preferably, a groove is formed on the lower end face of the outer adjuster, and the upper spring seat is located in the groove of the outer adjuster. Arranging the upper spring seat in the groove of the outer adjuster can reduce the height of the valve, and at the same time make the layout of the outer and inner adjusters more compact.

[0012] Even more preferably, a hole is formed on the outer adjuster, and the inner adjuster passes through the hole and abuts against the upper end face of the upper spring seat in the groove.

[0013] Even more preferably, the outer adjuster is in an inverted U - shape.

[0014] Preferably in the above - mentioned technical solution, the lower end face of the outer adjuster has a protruding outer adjuster protrusion. The upper end of the outer spring is sleeved on the outer periphery of the outer adjuster protrusion, and the upper end of the outer spring can be fixed by the outer adjuster protrusion.

[0015] Preferably in the above - mentioned technical solution, a bearing is arranged between the upper end of the outer spring and the outer adjuster to reduce the friction during adjustment.

[0016] Preferably, in the above technical solution, the adjusting assembly further includes an outer locking member and an inner locking member. The outer locking member is sleeved on the outer adjusting member to lock the outer adjusting member and the valve body unit, and the inner locking member is sleeved on the inner adjusting member to lock the inner adjusting member and the outer adjusting member, so as to maintain the stability after adjustment.

[0017] More preferably, the outer locking member and the inner locking member are locking nuts. The outer locking member is threadedly connected to the outer peripheral surface of the outer adjusting member; the inner locking member is threadedly connected to the outer peripheral surface of the inner adjusting member.

[0018] Preferably, in the above technical solution, the outer adjusting member and the inner adjusting member are adjusting screws. The outer peripheral surface of the outer adjusting member is threadedly connected to the valve body unit; a hole is formed in the outer adjusting member, the inner adjusting member passes through the hole, and the outer peripheral surface of the inner adjusting member is threadedly connected to the hole of the outer adjusting member.

[0019] Preferably, in the above technical solution, the lower end surface of the lower spring seat has a protruding outer protruding portion and an inner protruding portion of the lower spring seat. The lower end of the outer spring is sleeved on the outer periphery of the outer protruding portion of the lower spring seat, and the lower end of the inner spring is sleeved on the outer periphery of the inner protruding portion of the lower spring seat. The lower ends of the outer spring and the inner spring are fixed by the outer protruding portion and the inner protruding portion of the lower spring seat.

[0020] Preferably, in the above technical solution, the valve body includes a valve body, a valve seat, and a valve cover. The valve seat is installed in the valve body. The openings of the valve body and the valve seat coincide to form the inlet of the valve. The outlet of the valve seat is communicated with the outlet of the valve body. The outlet of the valve body forms the outlet of the valve. The valve flap unit is arranged in the valve body to open and close the outlet of the valve seat. The valve cover covers the valve body. The valve stem and the elastic unit are arranged in the valve cover. The outer adjusting member is adjustably connected to the upper end of the valve cover.

[0021] Preferably, in the above technical solution, the materials of the outer spring and the inner spring are Inconel alloy, 316 stainless steel, etc.

[0022] Preferably, in the above technical solution, the maximum wire diameter of the outer spring and the inner spring is not greater than 40 mm.

[0023] Preferably, in the above technical solution, the outer spring is a helical compression spring or a disc spring, which is suitable for the adjustment of higher pressures.

[0024] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0025] 1. Without changing the specifications, the set pressure of the valve can be increased. At the same time, the two adjustment structures are adjusted separately, reducing the mutual influence between the springs, facilitating adjustment, and improving the assembly efficiency and stability.

[0026] 2. Under the same caliber condition, the safety valve can meet higher pressure requirements, expanding the application pressure range of the safety valve under special working conditions.

[0027] 3. While maintaining the original structural dimensions, the wire diameter of a single spring is reduced, reducing the generation of non-standard structures and lowering the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Appendix Figure 1 is a cross-sectional schematic view of a prior art safety valve;

[0029] Appendix Figure 2 is a cross-sectional schematic view of the safety valve of the present invention.

[0030] In the above drawings:

[0031] 10. Valve body; 11. Valve seat; 12. Valve cover; 13. Protective cover;

[0032] 20. Guide sleeve; 21. Reaction disc; 22. Valve disc;

[0033] 3. Valve stem; 30. Spherical sleeve;

[0034] 40. Lower spring seat; 400. Outer protruding part of the lower spring seat; 401. Inner protruding part of the lower spring seat; 41. Upper spring seat; 410. Protruding part of the upper spring seat;

[0035] 5. Spring; 50. Outer spring; 51. Inner spring;

[0036] 6. Adjusting part; 60. Outer adjusting part; 600. Outer protruding part of the outer adjusting part; 601. Groove; 61. Inner adjusting part; 62. Outer locking part; 63. Inner locking part;

[0037] 7. Bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] As Figure 2 shown, a safety valve with a set pressure grading adjustment includes a valve body unit, a valve flap unit, a valve stem 3, an elastic unit, etc. Specifically:

[0041] The valve body unit includes a valve body 10, a valve seat 11, a valve cover 12, and a protective cover 13. The valve seat 11 is installed inside the valve body 10. The openings of the valve body 10 and the valve seat 11 coincide to form the inlet of the valve. The outlet of the valve seat 11 is communicated with the outlet of the valve body 10, and the outlet of the valve body 10 forms the outlet of the valve. The valve cover 12 is covered on the valve body 10, and the protective cover 13 is covered on the top of the valve cover 12.

[0042] The valve flap unit includes a guide sleeve 20, a backwash disc 21, and a valve flap 22. The guide sleeve 20 is fixed between the valve body 10 and the valve cover 12. The backwash disc 21 is arranged inside the guide sleeve 20 and can move under the guiding action of the guide sleeve 20. The valve flap 22 is connected to the backwash disc 21 and closes the outlet of the valve seat 11 during normal operation.

[0043] The valve stem 3 is arranged inside the valve cover 12. The lower end of the valve stem 3 cooperates with the valve flap unit. In the figure, the lower end of the valve stem 3 abuts against the backwash disc 21. The upper end of the valve stem 3 passes through the valve cover 12, and the protective cover 13 covers the upper end of the valve stem 3.

[0044] The elastic unit is arranged inside the valve cover 12. The elastic unit gives the elastic force for the valve stem 3 to move and drive the valve flap unit to close the valve body unit (the outlet of the valve seat 11). In this embodiment: The elastic unit includes a spring seat assembly, a spring assembly, and an adjustment assembly. The spring seat assembly, the spring assembly, and the adjustment assembly are sleeved on the valve stem 3, and the spring seat assembly, the spring assembly, the adjustment assembly sleeve, and the valve stem 3 are all coaxially arranged. The spring seat assembly includes a lower spring seat 40 and an upper spring seat 41; the spring assembly includes an outer spring 50 and an inner spring 51; the adjustment assembly includes an outer adjusting member 60, an inner adjusting member 61, an outer locking member 62, and an inner locking member 63. Specifically:

[0045] The lower spring seat 40 and the upper spring seat 41 are both sleeved on the valve stem 3. The lower end face of the lower spring seat 40 abuts against the spherical seat 30 on the valve stem 3, and the upper end face of the upper spring seat 41 abuts against the inner adjusting member 61. In this embodiment: The lower end face of the lower spring seat 40 has a protruding outer protruding portion 400 and an inner protruding portion 401 of the lower spring seat. In the figure: The inner protruding portion 401 of the lower spring seat protrudes from the outer protruding portion 400 of the lower spring seat, forming a stepped structure. Similarly, the lower end face of the upper spring seat 41 has a protruding upper spring seat protruding portion 410, and each protruding portion is used to fix both ends of the outer spring 50 and the inner spring 51.

[0046] The outer spring 50 is located on the outer periphery of the inner spring 51. The lower ends of the outer spring 50 and the inner spring 51 are supported on the lower spring seat 40. The upper end of the outer spring 50 abuts against the outer adjusting member 60, and the upper end of the inner spring 51 abuts against the lower end face of the upper spring seat 41. A bearing 7, such as a thrust ball bearing, is provided between the upper end of the outer spring 50 and the outer adjusting member 50 to reduce the frictional force during adjustment. In this embodiment: The lower end of the outer spring 50 is sleeved on the outer periphery of the outer protruding portion 400 of the lower spring seat, and the lower end of the inner spring 51 is sleeved on the outer periphery of the inner protruding portion 401 of the lower spring seat. The lower ends of the outer spring 50 and the inner spring 51 are fixed by the outer protruding portion 400 and the inner protruding portion 401 of the lower spring seat. The upper end of the inner spring 51 is sleeved on the outer periphery of the upper spring seat protruding portion 410, and the upper end of the inner spring 41 can be fixed by the upper spring seat protruding portion 410.

[0047] In this embodiment: The materials of the outer spring 50 and the inner spring 51 are Inconel alloy, 316 stainless steel, etc. The maximum wire diameter of the outer spring 50 and the inner spring 51 is not greater than 40 mm. The outer spring 50 is a helical compression spring or a disc spring, which is suitable for the adjustment of higher pressures.

[0048] The outer adjusting member 60 is adjustably connected to the valve body unit, specifically adjustably connected to the upper end of the valve cover 12. The inner adjusting member 61 is adjustably connected to the outer adjusting member 60, and the protective cover 13 covers the upper ends of the outer adjusting member 60 and the inner adjusting member 61. In this embodiment: The outer adjusting member 60 and the inner adjusting member 61 are adjusting screws. The outer peripheral surface of the outer adjusting member 60 is threadedly connected to the valve cover 12. A hole is provided in the outer adjusting member 60, and the inner adjusting member 61 passes through the hole. The outer peripheral surface of the inner adjusting member 61 is threadedly connected to the hole of the outer adjusting member 60. By adjusting the outer adjusting member 60, the compression amount of the outer spring 50 is adjusted, thereby adjusting the pressure of the outer spring 50. By adjusting the inner adjusting member 61, the compression amount of the inner spring 51 is adjusted, thereby adjusting the pressure of the inner spring 51. The lower end face of the outer adjusting member 60 has a protruding outer adjusting member protruding portion 600. The upper end of the outer spring 50 is sleeved on the outer periphery of the outer adjusting member protruding portion 500, and the upper end of the outer spring 50 can be fixed by the outer adjusting member protruding portion 600.

[0049] In a preferred embodiment of the present embodiment: a groove 601 is formed on the lower end surface of the outer adjusting member 60, that is, the entire outer adjusting member 60 is in an inverted U shape. The upper spring seat 41 is located in the groove 601 of the outer adjusting member 60. The inner adjusting member 61 passes through the hole and abuts against the upper end surface of the upper spring seat 41 in the groove 601. Arranging the upper spring seat 41 in the groove 601 of the outer adjusting member 60 can reduce the height of the valve, and at the same time make the layout of the outer adjusting member 60 and the inner adjusting member 61 more compact.

[0050] The outer locking member 62 is sleeved on the outer adjusting member 60 for locking the outer adjusting member 62 and the valve cover 12. The inner locking member 63 is sleeved on the inner adjusting member 61 for locking the inner adjusting member 61 and the outer adjusting member 60 to maintain the stability after adjustment. In this embodiment: the outer locking member 62 and the inner locking member 63 are locking nuts. The outer locking member 62 is threadedly connected to the outer peripheral surface of the outer adjusting member 60; the inner locking member 63 is threadedly connected to the outer peripheral surface of the inner adjusting member 61.

[0051] During adjustment, first adjust the outer spring 50 to the set position (calculated) through the outer adjusting member 60, and lock the outer adjusting member 60 through the outer locking member 62. Then adjust the inner spring 51 through the inner adjusting member 61 to adjust the set pressure of the valve to the set value. Among them, the outer spring 50 bears the main force (generally 80% or more of the set pressure of the valve), and the inner spring 51 bears a smaller force.

[0052] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A safety valve with set pressure and graded regulation, comprising a valve body unit, a valve flap unit, a valve stem and an elastic unit, wherein the lower end of the valve stem cooperates with the valve flap unit, and the elastic unit gives the valve stem an elastic force to drive the valve flap unit to close the valve body unit, characterized in that: The elastic unit includes a spring seat assembly, a spring assembly and an adjusting assembly, wherein the spring seat assembly, the spring assembly and the adjusting assembly are sleeved on the valve stem, and the spring seat assembly includes a lower spring seat; the spring assembly includes an outer spring and an inner spring, wherein the outer spring is located at the outer periphery of the inner spring, and the lower ends of the outer spring and the inner spring are supported on the lower spring seat; the adjusting assembly includes an outer adjusting member and an inner adjusting member, wherein the outer adjusting member is adjustably connected to the valve body unit, the upper end of the outer spring is against the outer adjusting member, and the inner adjusting member is adjustably connected to the outer adjusting member, and the upper end of the inner spring is against the inner adjusting member.

2. The safety valve with set pressure graded regulation according to claim 1 is characterized in that: The spring seat assembly also includes an upper spring seat, the upper end of the inner spring abuts against the lower end surface of the upper spring seat, and the upper end surface of the upper spring seat abuts against the inner adjusting member.

3. The safety valve with set pressure graded regulation according to claim 2 is characterized in that: The lower end surface of the upper spring seat is provided with a protruding upper spring seat protrusion, and the upper end of the inner spring is sleeved on the outer periphery of the upper spring seat protrusion.

4. The safety valve with set pressure graded regulation according to claim 2 is characterized in that: A groove is formed on the lower end surface of the outer adjusting member, and the upper spring seat is located in the groove of the outer adjusting member; The outer adjusting member is provided with a hole, and the inner adjusting member passes through the hole and abuts against the upper end surface of the upper spring seat in the groove.

5. The safety valve with set pressure graded regulation according to claim 1, characterized in that: The lower end surface of the outer adjusting member is provided with a protruding outer adjusting member protruding portion, and the upper end of the outer spring is sleeved on the outer periphery of the outer adjusting member protruding portion.

6. The safety valve with set pressure graded regulation according to claim 1, characterized in that: A bearing is arranged between the upper end of the outer spring and the outer adjusting member.

7. The safety valve with set pressure graded regulation according to claim 1, characterized in that: The adjustment assembly further comprises an outer locking member and an inner locking member, wherein the outer locking member is sleeved on the outer adjustment member for locking the outer adjustment member with the valve body unit, and the inner locking member is sleeved on the inner adjustment member for locking the inner adjustment member with the outer adjustment member; The outer locking piece and the inner locking piece are locking nuts. The outer locking piece is threadedly connected to the outer peripheral surface of the outer adjusting piece; the inner locking piece is threadedly connected to the outer peripheral surface of the inner adjusting piece.

8. The safety valve with set pressure graded regulation according to claim 1, characterized in that: The outer adjusting part and the inner adjusting part are adjusting screws, and the outer peripheral surface of the outer adjusting part is threadedly connected to the valve body unit; a hole is opened on the outer adjusting part, and the inner adjusting part passes through the hole, and the outer peripheral surface of the inner adjusting part is threadedly connected to the hole of the outer adjusting part.

9. The safety valve with set pressure graded regulation according to claim 1, characterized in that: The lower end surface of the lower spring seat has a protruding lower spring seat outer protrusion and a lower spring seat inner protrusion. The lower end of the outer spring is sleeved on the outer periphery of the lower spring seat outer protrusion, and the lower end of the inner spring is sleeved on the outer periphery of the lower spring seat inner protrusion.

10. The safety valve with set pressure graded regulation according to claim 1, characterized in that: The valve body unit includes a valve body, a valve seat, and a valve cover. The valve seat is installed in the valve body. The openings of the valve body and the valve seat overlap to form an inlet of the valve. The outlet of the valve seat is connected to the outlet of the valve body. The outlet of the valve body forms the outlet of the valve. The valve flap unit is arranged in the valve body for opening and closing the outlet of the valve seat. The valve cover is arranged on the valve body. The valve stem and the elastic unit are arranged in the valve cover. The external adjustment member is adjustably connected to the upper end of the valve cover.

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