Plastic safety valve

Abstract

The plastic safety valve comprises a valve body, a valve core, an end cover and a spring, a valve cavity and a safety cavity are arranged in the valve body, the valve cavity and the safety cavity are communicated through a through hole, the safety cavity is provided with a pressure relief opening and an opening part, the end cover is connected to the opening part in a sealing mode, and the spring is arranged on the end cover. The valve element comprises a valve rod, a first disc body and a second disc body, the first disc body and the second disc body are both fixedly connected to the valve rod, the valve element is axially connected to the end cover in a sliding mode, and the outer periphery of the second disc body and the inner periphery of the end cover are sealed in a sliding mode. The first disc body is matched with the through hole, the spring is located on the side, opposite to the safety cavity, of the second disc body, and the spring elastically acts on the valve element and can elastically maintain sealing of the first disc body and the through hole. Waterproof separation can be carried out on the spring, the waterproof problem of the spring of the safety valve is solved, the structure of the safety valve product is simplified, the whole assembly of the safety valve is simpler and more convenient, and the product cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more specifically, to a plastic safety valve. Background Art

[0002] A safety valve refers to an automatic valve that, when the system pressure exceeds the specified value, discharges a part of the gas / fluid in the system into the atmosphere / outside the pipeline, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not have an accident due to excessive pressure. Taking the safety valve of a water system as an example, the valve cavity of the safety valve is connected to the waterway through a pipeline. When the water pressure in the water system is too high, the water pressure will push the valve core in the safety valve to open the safety valve, and the pressure in the water system is discharged through the water leakage port of the safety valve. It is normal for the safety valve to have a water dripping phenomenon during water passing; if there is no water droplet, it means that the water pressure in the pipe is within the rated pressure range set by the safety valve.

[0003] The pressure in the water system is usually resisted by a spring inside the safety valve. The spring is generally made of metal material and will rust when encountering water, thus damaging the product itself and directly affecting the working stability and service life of the safety valve. At present, in order to waterproof and protect the spring inside the safety valve, a diaphragm is usually used to isolate the spring from the valve cavity. However, the installation structure of the diaphragm is relatively complex and the cost also increases slightly.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art, and provide a plastic safety valve with a simple structure, which can waterproof and separate the spring and solve the problem of spring waterproofing of the safety valve.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A plastic safety valve includes a valve body, a valve core, an end cover and a spring. A valve cavity and a safety cavity are arranged inside the valve body. The valve cavity and the safety cavity are connected through a through hole. A pressure relief port is arranged on the safety cavity. An opening part is arranged on the safety cavity. The end cover is sealingly connected to the opening part. The valve core is axially slidably connected to the end cover. The valve core includes a first disc body and a second disc body. The outer periphery of the second disc body is slidably sealed with the inner periphery of the end cover. The first disc body is adapted to the through hole. The spring is located on the side of the second disc body facing away from the safety cavity. The spring elastically acts on the valve core and can elastically maintain the sealing of the first disc body and the through hole.

[0008] The utility model is further provided with an insert. The insert is annular and is integrally connected to the inner periphery of the opening part. The end cover is fixedly connected to the insert.

[0009] The utility model is further configured such that the valve body is made of plastic, the insert is made of metal, and the valve body and the insert are integrally injection-molded.

[0010] The utility model is further configured such that an external thread portion is provided outside the end cap, an internal thread portion is provided inside the insert, and the external thread portion is threadedly connected to the internal thread portion; a first convex ring portion is provided on the inner circumference of the insert, and a part of the end cap extends into the insert and abuts against the first convex ring portion to achieve positioning.

[0011] The utility model is further configured such that a first sealing groove portion is formed at one end of the insert away from the safety chamber, and a first sealing member is provided in the first sealing groove portion; a second convex ring portion is fixedly connected to the outer circumference of the end cap, and sealing between the insert and the second convex ring portion is achieved through the first sealing member.

[0012] The utility model is further configured such that the safety chamber has a sealing surface, and the through hole is opened on the sealing surface; the first disc can abut against the sealing surface and press and seal the through hole.

[0013] The utility model is further configured such that a pressing and sealing member is installed on one side of the first disc facing the sealing surface, and the first disc can be sealed with the through hole through the pressing and sealing member.

[0014] The utility model is further configured such that a second sealing groove portion is formed on the outer circumference of the second disc, and a second sealing member is sleeved at the second sealing groove portion; the end cap includes a cylindrical portion, and the second disc is located inside the cylindrical portion to form a sliding sealing structure;

[0015] The utility model is further configured such that a bottom surface is provided inside the end cap, and two ends of the spring respectively abut against the bottom surface and the second disc.

[0016] The utility model is further configured such that the valve core further includes a valve rod, the first disc and the second disc are both fixedly connected to the valve rod, a sliding sleeve portion is fixedly connected inside the end cap, and a part of the valve rod is axially slidably connected to the sliding sleeve portion.

[0017] In summary, the utility model has the following beneficial effects:

[0018] In this solution, through the mutual cooperation of the valve core and the cover body, sliding sealing can be achieved, the installation space of the spring can be waterproofed, rusting of the spring metal parts due to water can be avoided, the stability of the safety valve can be ensured, the service life of the safety valve can be extended, and the structure of the safety valve product is simplified, making the overall assembly of the safety valve more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of a plastic safety valve in this embodiment;

[0020] Figure 2 A cross-sectional view of a plastic safety valve in this embodiment;

[0021] Figure 3 An exploded view of a plastic safety valve in this embodiment;

[0022] Figure 4 A schematic structural view of the valve core in this embodiment.

[0023] Reference numerals: valve body 1; valve cavity 11; safety cavity 12; pressure relief port 13; through hole 14; sealing surface 15; opening part 16; interface 17; insert 2; internal thread part 21; first convex ring part 22; first sealing groove part 23; valve core 3; first disc body 31; pressure-resistant sealing member 311; second disc body 32; second sealing groove part 321; valve stem 33; spring 4; end cover 5; cylindrical part 51; second convex ring part 52; bottom surface 53; sliding sleeve part 54; external thread part 55; first sealing member 6; second sealing member 7. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] This embodiment discloses a plastic safety valve. Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, it includes a valve body 1, an insert 2, a valve core 3, an end cover 5 and a spring 4. Among them, the valve body 1 serves as the main body of the plastic safety valve, and all other components are installed with the valve body 1 as the support.

[0026] A valve cavity 11 and a safety cavity 12 are arranged inside the valve body 1. The valve body 1 is further provided with an interface 17 for connecting the safety valve to a pipeline. The valve cavity 11 and the safety cavity 12 are communicated through a through hole 14, and the through hole 14 can be sealed by the valve core 3. When the pressure in the valve cavity 11 is too high, the pressure in the valve cavity 11 will push open the valve core 3, open the through hole 14, so that the valve cavity 11 and the safety cavity 12 can be linked, and the pressure in the valve cavity 11 can be relieved to the safety cavity 12 to avoid excessive pressure in the safety valve and the pipeline.

[0027] A pressure relief port 13 is arranged in the safety cavity 12, and the pressure relief port 13 can discharge the liquid in the safety cavity 12 to achieve pressure relief.

[0028] The safety chamber 12 is provided with an opening 16, and the end cover 5 is sealingly connected to the opening 16. Part of the valve core 3 is installed inside the end cover 5, and part of it extends into the safety chamber 12 from the opening 16.

[0029] The valve core 3 includes a valve stem 33, a first disk body 31 and a second disk body 32, and is of an integrally injection-molded structure. Both the first disk body 31 and the second disk body 32 are fixedly connected to the valve stem 33. The first disk body 31 is located at the end of the valve stem 33, and the second disk body 32 is approximately located in the middle of the valve stem 33.

[0030] The valve core 3 is axially slidably connected to the end cover 5. The outer circumference of the second disk body 32 is slidably sealed with the inner circumference of the end cover 5. Through the second disk body 32, the inner cavity of the end cover 5 can be divided into two parts. One part is communicated with the safety chamber 12, and the other part is separated from the safety chamber 12. The spring 4 is located on the side of the second disk body 32 facing away from the safety chamber 12, that is, the spring 4 will not be affected by the water in the safety chamber 12, and will not rust or corrode, ensuring that the spring 4 has a longer service life and improving the reliability of the entire safety valve.

[0031] Specifically, a second sealing groove portion 321 is formed on the outer circumference of the second disk body 32, and a second sealing member 7 is sleeved at the second sealing groove portion 321. The end cover 5 includes a cylindrical portion 51. The inner circumference size of the cylindrical portion 51 is adapted to the outer circumference size of the second disk body 32. The second disk body 32 is located inside the cylindrical portion 51 to form a sliding structure, and sliding sealing is achieved through the second sealing member 7.

[0032] The first disk body 31 is adapted to the through hole 14, and the spring 4 acts on the valve core 3 elastically. Under the action of the spring 4, the first disk body 31 can be elastically maintained in sealing with the through hole 14. By using the spring 4 to counteract the internal pressure of the valve body 1, when the internal pressure of the valve body 1 is too high, the pressure of the spring 4 can be overcome, and the first disk body 31 is pushed to open the through hole 14 to achieve pressure relief. A bottom surface 53 is provided inside the end cover 5. The two ends of the spring 4 are respectively pressed against the bottom surface 53 and the second disk body 32 to transmit the elastic acting force. At the pressing positions of the two ends of the spring 4, metal gaskets can be inserted to increase the force-bearing area between the spring and the pressing contact surface and improve the installation stability of the spring 4.

[0033] The valve core 3 needs to slide inside the safety valve. A sliding sleeve portion 54 can be fixedly connected inside the end cover 5. The sliding sleeve portion 54 is of an annular cylindrical structure, and the inner circumference size is adapted to the end size of the valve stem 33. Part of the end of the valve stem 33 extends into the sliding sleeve portion 54 to form a sliding connection structure, which can play a role in guiding the operation of the valve core 3.

[0034] In this embodiment, the valve body 1 may be made of plastic material. In order to improve the connection strength and precision between the valve body 1 and the end cover 5, an insert 2 may be embedded in the opening 16 of the valve body 1. The insert 2 is annular and integrally connected to the inner periphery of the opening 16. The insert 2 is made of metal material and is pre-processed and formed. During the injection molding process of the valve body 1, the valve body 1 and the insert 2 are integrally injection molded, so that the two form an integrated structure. When the end cover 5 is installed, it is connected to the insert 2, and the valve body 1 and the end cover 5 can also be installed indirectly.

[0035] Specifically, an external threaded portion 55 is provided on the outside of the end cap 5, and an internal threaded portion 21 is provided on the inside of the insert 2. During installation, a portion of the end cap 5 extends into the inner circumference of the insert 2, and the external threaded portion 55 is threadedly connected with the internal threaded portion 21 to achieve the connection and fixation of the end cap 5 and the insert 2. In addition, a convex ring portion 22 is provided on the inner circumference of the insert 2, and a portion of the end cap 5 extends into the insert 2 and abuts against the convex ring portion 22 to achieve position limiting.

[0036] In order to achieve sealing between the end cover 5 and the insert 2, a sealing groove 23 is provided at the end away from the safety cavity 12, and a sealing member 6 is arranged in the sealing groove 23. A convex ring 52 is fixedly connected to the outer periphery of the end cover 5, and the position of the convex ring 52 corresponds to the sealing groove 23. When the end cover 5 is threadedly connected to the insert 2, the convex ring 52 will press the sealing member 6, and the seal 6 is achieved between the insert 2 and the convex ring 52.

[0037] Reference Figure 2 , Figure 3 As shown, a sealing surface 15 is provided in the safety chamber 12, and the sealing surface 15 is a plane, and a through hole 14 is provided at the sealing surface 15, and the through hole 14 connects the valve chamber 11 and the safety chamber 12. The disc body 13 is pressed against the sealing surface 15, and when pressed, the through hole 14 is completely covered to achieve sealing.

[0038] Reference Figure 4 As shown, a pressing seal 311 is installed on the side of the disk body 31 facing the sealing surface 15, and the disk body 31 can be sealed with the through hole 14 through the pressing seal 311.

[0039] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A plastic safety valve, characterized in that, It includes a valve body (1), a valve core (3), an end cover (5) and a spring (4). A valve cavity (11) and a safety cavity (12) are arranged inside the valve body (1). The valve cavity (11) and the safety cavity (12) are communicated through a through hole (14). A pressure relief port (13) is arranged on the safety cavity (12). An opening part (16) is arranged on the safety cavity (12). The end cover (5) is hermetically connected to the opening part (16). The valve core (3) is axially slidably connected to the end cover (5). The valve core (3) includes a first disk body (31) and a second disk body (32). The outer periphery of the second disk body (32) is slidably sealed with the inner periphery of the end cover (5). The first disk body (31) is mutually adapted to the through hole (14). The spring (4) is located on the side of the second disk body (32) facing away from the safety cavity (12). The spring (4) elastically acts on the valve core (3) and can elastically maintain the sealing between the first disk body (31) and the through hole (14).

2. The plastic safety valve according to claim 1, characterized in that, It further includes an insert (2). The insert (2) is annular and is integrally connected to the inner periphery of the opening part (16). The end cover (5) is fixedly connected to the insert (2).

3. The plastic safety valve according to claim 2, characterized in that, The valve body (1) is made of plastic, and the insert (2) is made of metal. The valve body (1) and the insert (2) are integrally injection molded.

4. The plastic safety valve according to claim 3, characterized in that, An external thread part (55) is arranged on the outside of the end cover (5). An internal thread part (21) is arranged inside the insert (2). The external thread part (55) is threadedly connected to the internal thread part (21). A first convex ring part (22) is arranged on the inner periphery of the insert (2). A part of the end cover (5) extends into the insert (2) and abuts against the first convex ring part (22) to achieve position limitation.

5. A plastic safety valve according to claim 2, characterized in that, A first sealing groove part (23) is arranged at one end of the insert (2) facing away from the safety cavity (12). A first sealing member (6) is arranged in the first sealing groove part (23). A second convex ring part (52) is fixedly connected to the outer periphery of the end cover (5). Sealing between the insert (2) and the second convex ring part (52) is achieved through the first sealing member (6).

6. The plastic safety valve according to claim 1, characterized in that, A sealing surface (15) is arranged on the safety cavity (12). The through hole (14) is arranged on the sealing surface (15). The first disk body (31) can abut against the sealing surface (15) and press and seal the through hole (14).

7. A plastic safety valve according to claim 6, characterized in that, A pressing sealing member (311) is installed on the side of the first disk body (31) facing the sealing surface (15). Sealing between the first disk body (31) and the through hole (14) is achieved through the pressing sealing member (311).

8. A plastic safety valve according to claim 1, characterized in that, A second sealing groove part (321) is arranged on the outer periphery of the second disk body (32). A second sealing member (7) is sleeved at the second sealing groove part (321). The end cover (5) includes a cylindrical part (51). The second disk body (32) is located inside the cylindrical part (51) to form a sliding sealing structure.

9. The plastic safety valve according to claim 1, characterized in that, A bottom surface (53) is arranged inside the end cover (5). The two ends of the spring (4) respectively abut against the bottom surface (53) and the second disk body (32).

10. A plastic safety valve according to claim 1, characterized in that, The valve core (3) further includes a valve stem (33). Both the first disk body (31) and the second disk body (32) are fixedly connected to the valve stem (33). A sliding sleeve portion (54) is fixedly connected inside the end cover (5), and a part of the valve stem (33) is axially slidably connected to the sliding sleeve portion (54).

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