Anti-seizure safety valve

Abstract

The utility model relates to an anti-seizure safety valve which comprises a guide sleeve and a recoil disc, the periphery of the recoil disc is sleeved with the guide sleeve, the recoil disc can move relative to the guide sleeve, the safety valve further comprises a ring body, the ring body is arranged between the guide sleeve and the recoil disc in a sleeved mode, and the ring body can move relative to the guide sleeve. And the ring body is provided with an opening, so that an unclosed split ring is formed. By arranging the ring body, on one hand, the phenomenon of seizure in the frequent opening and closing process of the valve can be prevented, on the other hand, the phenomenon of strain in the frequent opening and closing process of the guide sleeve and the recoil disc can be avoided, the action performance of the safety valve and the system safety are ensured, and the normal operation of the valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a safety valve that prevents biting. Background Art

[0002] Safety valves are special valves whose opening and closing parts are in a normally closed state 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. Among them: guide sleeve and recoil disc are the main components of the safety valve, such as Figure 1 , 2 As shown: the guide sleeve is set on the outside of the recoil disc, the bottom of the recoil disc cooperates with the valve disc, and an elastic part is set on the top of the recoil disc to give the valve disc an elastic force to close downward. When the medium force is greater than the elastic force, the medium force will push the recoil disc upward, and friction will be generated between the recoil disc and the guide surface of the guide sleeve; when the medium force is less than the elastic force, the elastic force will push the recoil disc downward, and friction will also be generated between the recoil disc and the guide surface of the guide sleeve. During the opening and closing process of the safety valve, friction will be generated between the recoil disc and the guide surface of the guide sleeve. When the number of opening and closing is small, these frictions will only produce some scratches. As the number of opening and closing increases, these frictions will slowly evolve into scratches. Strain on the guide surface will cause the set pressure to increase, so that the safety valve needs overpressure to open, and it cannot play the role of overpressure protection for the pressure system.

[0003] Usually the recoil disc and guide sleeve are made of the same material, mainly stainless steel, such as the material combination 20Cr3 / 20Cr13, 304 / 304, 316 / 316, etc. The materials have no hardness difference and the hardness of austenitic stainless steel is relatively low. For safety valves that are frequently opened and closed, the probability of strain on the guide surfaces of the recoil disc and the guide sleeve will be higher, affecting the performance of the safety valve. Summary of the invention

[0004] The utility model aims to provide a safety valve which can prevent seizure.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A safety valve for preventing seizure comprises: a guide sleeve and a recoil disc, wherein the guide sleeve is sleeved on the outer periphery of the recoil disc and the recoil disc can move relative to the guide sleeve, and the safety valve further comprises a ring body, wherein the ring body is sleeved between the guide sleeve and the recoil disc and the ring body is provided with an opening to form an open open ring.

[0007] Preferably, in the above technical solution, the ring body comprises a substrate layer and a covering layer, and the covering layer is arranged on the periphery of the substrate layer.

[0008] Further preferably, the substrate layer is made of metal; and the covering layer is made of plastic.

[0009] More preferably, the substrate layer is 316 stainless steel; and the covering layer is PTFE.

[0010] Further preferably, the thickness of the substrate layer is smaller than the thickness of the covering layer.

[0011] Preferably, in the above technical solution, a limiting portion is provided between the guide sleeve and the recoil disc, and the limiting portion is used to limit the ring body from being separated from between the guide sleeve and the recoil disc.

[0012] Preferably, in the above technical solution, the lower end of the guide sleeve has a convex portion protruding toward one side of the recoil disk, and the ring body is located between the guide sleeve and the recoil disk and supported on the convex portion.

[0013] Preferably, the above technical solution is such that the safety valve further comprises a valve body, a valve seat, a valve cover, a valve disc and a valve stem; the valve body has a valve body inlet and a valve body outlet; the valve seat has a valve seat inlet and a valve seat outlet; the valve seat is arranged in the valve body; the valve body inlet and the valve seat inlet overlap to form a safety valve inlet; the valve body outlet forms a safety valve outlet; the valve seat outlet is connected to the valve body outlet; the guide sleeve is located in the valve body and fixed between the valve body and the valve cover; the upper part of the guide sleeve is sleeved on the outer periphery of the upper part of the recoil disk; the valve disc is connected to the lower part of the recoil disk for closing and opening the valve seat outlet; the lower end of the valve stem cooperates with the recoil disk.

[0014] Further preferably, the guide sleeve has a hollow sleeve body, the upper end of the sleeve body protrudes outward to form an edge, the guide sleeve is fixed between the valve body and the valve cover through the edge, and the sleeve body is sleeved on the outer periphery of the upper part of the recoil disk.

[0015] Further preferably, the recoil disc comprises a disc body and a column, the lower end of the column is connected to the disc body, the valve flap is connected to the disc body, and the sleeve body is sleeved on the outer periphery of the column;

[0016] A groove is formed at the upper end of the column, and the lower end of the valve stem extends into the groove.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The utility model provides a ring body, which can prevent the valve from being stuck during the frequent opening and closing process, and can also avoid the guide sleeve and the recoil disc from being strained during the frequent opening and closing process, thereby ensuring the action performance of the safety valve and the system safety, and ensuring the normal operation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a cross-sectional schematic diagram of a safety valve in the prior art;

[0020] Attached Figure 2 For attachment Figure 1 A magnified view of part A in FIG.

[0021] Attached Figure 3 It is a cross-sectional schematic diagram of the matching relationship between the guide sleeve, the ring body and the recoil disc in the utility model;

[0022] Attached Figure 4 It is a top view schematic diagram of the ring body in the utility model;

[0023] Attached Figure 5 It is a cross-sectional schematic diagram of the ring body in the utility model.

[0024] In the above attached figure:

[0025] 1. Valve body; 10. Valve body inlet; 11. Valve body outlet; 2. Valve seat; 20. Valve seat inlet; 21. Valve seat outlet; 3. Valve cover; 4. Valve disc; 5. Valve stem; 6. Guide sleeve; 60. Sleeve body; 61. Sleeve body; 62. Protrusion; 7. Recoil disc; 70. Disc body; 71. Cylinder; 72. Groove body; 8. Elastic component; 9. Ring body; 90. Opening; 91. Base layer; 92. Covering layer. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 The anti-seizure safety valve shown mainly includes a valve body 1, a valve seat 2, a valve cover 3, a valve disc 4, a valve stem 5, a guide sleeve 6, a recoil disc 7, an elastic component 8, etc. Among them:

[0029] The valve body 1 has a valve body inlet 10 and a valve body outlet 11, and the valve seat 2 has a valve seat inlet 20 and a valve seat outlet 21. The valve seat 2 is arranged in the valve body 1, and the valve body inlet 10 and the valve seat inlet 20 overlap to form a safety valve inlet, the valve body outlet 11 forms a safety valve outlet, and the valve seat outlet 21 is connected to the valve body outlet 11.

[0030] The guide sleeve 6 is located in the valve body 1 and fixed between the valve body 1 and the valve cover 3. The guide sleeve 6 is sleeved on the outer periphery of the recoil disk 7. The valve disc 4 is connected to the recoil disk 7 and is used to close and open the valve seat outlet 21. The lower end of the valve stem 5 cooperates with the recoil disk 7. The elastic component 8 cooperates with the valve stem 5 to give the valve stem 5 an elastic force to push the recoil disk 7 to drive the valve disc 4 to close the valve seat outlet 21.

[0031] In this embodiment, the guide sleeve 6 has a hollow sleeve body 60 , the upper end of the sleeve body 61 protrudes outward to form an edge 61 , the guide sleeve 50 is fixed between the valve body 1 and the valve cover 3 through the edge 61 , and the sleeve body 61 is sleeved on the outer periphery of the recoil disk 7 .

[0032] In this embodiment, the recoil disc 7 includes a disc body 70 and a column 71. The lower end of the column 71 is connected to the disc body 70. The valve flap 4 is connected to the disc body 70. The sleeve body 60 is sleeved on the outer periphery of the column 71, so that the recoil disc 7 can move relative to the guide sleeve 6. In addition, a groove 72 is formed at the upper end of the column 71, and the lower end of the valve stem 5 extends into the groove 72.

[0033] In one implementation of this embodiment: the safety valve further includes a ring body 9, which is sleeved between the guide sleeve 6 and the recoil disc 7, and the ring body 9 is provided with an opening 90 to form an open ring. Figure 3-5As shown. On the one hand, the ring body 9 can prevent the recoil disc 7 from biting with the guide sleeve 6 when moving, and on the other hand, the ring body 9 can prevent the guide sleeve 6 and the recoil disc 7 from being strained during frequent opening and closing, thereby ensuring the operating performance of the safety valve and the safety of the system. Specifically:

[0034] The ring body 9 includes a substrate layer 91 and a covering layer 92. The covering layer 92 is arranged on the periphery of the substrate layer 91, that is, the substrate layer 91 is an inner layer and the covering layer 92 is an outer layer. The thickness of the substrate layer 91 is less than that of the covering layer 92. The substrate layer 91 is mainly used to ensure the bearing capacity of the ring body 6, and the covering layer 92 is mainly used to reduce the friction between the guide sleeve 6 and the recoil disc 7. Usually, the substrate layer 91 is made of metal, and the covering layer 92 is made of plastic. Preferably, the substrate layer 91 is made of 316 stainless steel and the covering layer 92 is made of PTFE. The 316 stainless steel makes the ring body 9 have good bearing capacity and corrosion resistance as a whole, and the PTFE makes the ring body 9 have good self-lubricating properties as a whole.

[0035] In this embodiment, a limiting portion is provided between the guide sleeve 6 and the recoil disc 7, and the limiting portion is used to limit the ring body 9 from being separated from between the guide sleeve 6 and the recoil disc 7. The limiting portion can be provided on the guide sleeve 6 or on the recoil disc 7. Figure 3 As shown: In the figure, the lower end of the sleeve body 61 of the guide sleeve 6 has a convex portion 62 protruding toward one side of the recoil disk 7, and the ring body 9 is located between the guide sleeve 6 and the recoil disk 7 and supported on the convex portion 62.

[0036] After the fluid pressure increases, it enters the valve seat 2 through the safety valve inlet, opens the valve disc 4, and then enters the valve body 1 through the valve seat outlet 21 and flows out through the safety valve outlet. The valve disc 4 pushes the recoil disc 7 to move upward when it is opened. Because a ring body 9 is provided between the recoil disc 7 and the guide sleeve 6, the recoil disc 7 and the guide sleeve 6 can be prevented from being strained during frequent opening and closing, thereby ensuring the operating performance of the safety valve and the safety of the system.

[0037] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An anti-seizure safety valve, comprising: A guide sleeve and a recoil disc, wherein the guide sleeve is sleeved on the outer periphery of the recoil disc, and the recoil disc can move relative to the guide sleeve, and is characterized in that: the safety valve also includes a ring body, the ring body is sleeved between the guide sleeve and the recoil disc, and the ring body is provided with an opening to form an open open ring.

2. The anti-seizure safety valve according to claim 1, characterized in that: The ring body comprises a substrate layer and a covering layer, and the covering layer is arranged on the periphery of the substrate layer.

3. The anti-seizure safety valve according to claim 2, characterized in that: The substrate layer is made of metal; the covering layer is made of plastic.

4. The anti-seizure safety valve according to claim 3, characterized in that: The substrate layer is 316 stainless steel; the covering layer is PTFE.

5. The anti-seizure safety valve according to claim 2, characterized in that: The thickness of the substrate layer is smaller than the thickness of the covering layer.

6. The anti-seizure safety valve according to claim 1, characterized in that: A limiting portion is arranged between the guide sleeve and the recoil disc, and the limiting portion is used to limit the ring body from being separated from between the guide sleeve and the recoil disc.

7. The anti-seizure safety valve according to claim 1 or 6, characterized in that: The lower end of the guide sleeve has a convex portion protruding toward one side of the recoil disc, and the ring body is located between the guide sleeve and the recoil disc and supported on the convex portion.

8. The anti-seizure safety valve according to claim 1, characterized in that: The safety valve also includes a valve body, a valve seat, a valve cover, a valve disc, and a valve stem. The valve body has a valve body inlet and a valve body outlet. The valve seat has a valve seat inlet and a valve seat outlet. The valve seat is arranged in the valve body. The valve body inlet and the valve seat inlet overlap to form a safety valve inlet. The valve body outlet forms a safety valve outlet. The valve seat outlet is connected to the valve body outlet. The guide sleeve is located in the valve body and fixed between the valve body and the valve cover. The upper part of the guide sleeve is sleeved on the outer periphery of the upper part of the recoil disk. The valve disc is connected to the lower part of the recoil disk and is used to close and open the valve seat outlet. The lower end of the valve stem cooperates with the recoil disk.

9. The anti-seizure safety valve according to claim 8, characterized in that: The guide sleeve has a hollow sleeve body, the upper end of which protrudes outward to form an edge, the guide sleeve is fixed between the valve body and the valve cover through the edge, and the sleeve body is sleeved on the outer periphery of the upper part of the recoil disc.

10. The anti-seizure safety valve according to claim 9, characterized in that: The recoil disc comprises a disc body and a column, the lower end of the column is connected to the disc body, the valve flap is connected to the disc body, and the sleeve body is sleeved on the outer periphery of the column; A groove is formed at the upper end of the column, and the lower end of the valve stem extends into the groove.

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