Pressure release valve

Abstract

The utility model discloses a pressure release valve, which comprises a valve seat, an inlet end, an outlet end, an inlet end, an outlet end and an outlet end, the section of the sealing piece is in a V shape, and the sealing piece is arranged in the valve seat. A valve body is connected with the valve seat, an ejector rod is connected in the valve body in a sleeved mode, and the ejector rod is provided with a sealing head matched with the sealing piece in shape. The force application piece is used for controlling the ejector rod to move in the valve body, so that the sealing head is close to or far away from the sealing piece; after the ejector rod extends into the sealing piece to be matched, the pressure release valve is in a cut-off state, the basic pressure release function can be achieved through the pressure release valve, meanwhile, due to the fact that the sealing piece with the V-shaped section is arranged in the valve seat, the sealing piece is pressed at the bottom of the valve body through the ejector rod, and the sealing head and the sealing piece are matched and attached more tightly.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure gas pressure relief devices, and in particular relates to a pressure relief valve. Background Art

[0002] The nitrogen spring system (referred to as die nitrogen spring or nitrogen cylinder or nitrogen cylinder) is a new type of elastic component using high-pressure nitrogen as the working medium. It is small in size, large in elasticity, long in stroke, stable in operation, precisely manufactured, long in service life, with a gentle elastic curve, and no need for pre-tightening, etc. It can perform tasks that are difficult to accomplish with conventional elastic components such as metal springs, rubbers, and air cushions, simplify mold design and manufacturing, facilitate mold installation and adjustment, extend mold service life, and ensure stable product quality. It is a new generation of the most ideal elastic component with flexible performance.

[0003] If the nitrogen spring exceeds the specified stroke due to improper operation or other reasons during use, there is a risk that the piston rod of the nitrogen spring will break and fly out due to high pressure, or the nitrogen spring cylinder will rupture and explode, causing damage to the equipment or serious injury to personnel. This kind of situation has occurred many times, causing serious personal injury and loss.

[0004] A Chinese patent with application number CN201710674405.7 discloses a nitrogen spring with automatic pressure relief during overtravel, which mainly includes a cylinder body, an intermediate sleeve, a piston rod and a pressure relief valve. The upper end of the cylinder body is open, and an intermediate sleeve is installed in the upper end opening of the cylinder body. The piston rod passes through the intermediate sleeve and exceeds the upper end surface of the cylinder body. A pressure relief valve is installed at the bottom end surface of the cylinder body; a steel wire retaining ring, an O-ring and a large dust ring are installed between the cylinder body and the intermediate sleeve; an inflation valve is also installed on one side of the pressure relief valve, and one end of the inflation valve is connected to the chamber of the cylinder body through an inflation channel.

[0005] As the applicant conducted further research, it was found that since this technical solution adds a special pressure relief valve at the bottom of the cylinder, although it can trigger the pressure relief valve to instantly release the high-pressure nitrogen inside the nitrogen spring when the nitrogen spring is used in an overstroke, thereby avoiding the adverse effects caused by the overstroke, the pressure relief valve is limited by the internal sealing structure and its reliability is poor. Under high-pressure gas, the impact generated at the moment of pressure relief may cause damage to the seal. Utility Model Content

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

[0007] A pressure relief valve, comprising:

[0008] A valve seat having an outlet end and a joint, wherein the joint is provided with an inlet end;

[0009] A sealing member, which has a V-shaped cross section and is disposed in the valve seat;

[0010] A valve body connected to the valve seat, a push rod sleeved in the valve body, and the push rod has a sealing head conforming to the sealing element; and

[0011] A force-applying member, used for controlling the movement of the push rod in the valve body to make the sealing head approach or move away from the sealing member;

[0012] After the push rod is inserted into the sealing member for engagement, the pressure relief valve is in a cut-off state;

[0013] A support ring is arranged at the bottom of the valve body, and a through hole communicating with the outlet is opened on the support ring.

[0014] Furthermore, a sealing ring is provided at the tail of the sealing head.

[0015] Furthermore, a groove is provided on the inner bottom surface of the valve seat, and the sealing member is placed in the groove.

[0016] Furthermore, the force applying member includes a rotating portion which is threadedly connected to the valve body and sleeved on the outer periphery of the push rod.

[0017] Furthermore, a sliding member sleeved on the outer periphery of the push rod is provided at the upper end of the valve body, and the cross section of the sliding member is I-shaped.

[0018] Furthermore, a threaded hole is provided on the side of the force applying member.

[0019] Furthermore, the inlet end is arranged at the bottom of the valve seat, and the outlet end is arranged at the side of the valve seat.

[0020] Furthermore, the valve body is threadedly connected to the inner wall of the valve seat.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] This pressure relief valve can realize the basic pressure relief function. Because a seal with a V-shaped cross section is set in the valve seat, the seal is pressed against the bottom of the valve body by the push rod, and the seal head and the seal fit more closely. The deformation in the process of matching with the seal head is different from the ordinary seal structure, avoiding the adverse effects caused by irregular distortion, so that the reliability of high-pressure gas pressure sealing is enhanced. At the moment of pressure relief, the sealing accessories are not easily damaged. This design not only has a stable sealing effect, but also is durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a pressure relief valve embodiment of the utility model (viewing angle 1);

[0024] Figure 2It is a three-dimensional structural schematic diagram of a pressure relief valve embodiment of the utility model (viewing angle 2);

[0025] Figure 3 This is a schematic diagram of the main structure of a pressure relief valve embodiment of the utility model;

[0026] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0027] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0028] Figure 6 This is a schematic diagram of the explosion structure of a pressure relief valve embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of a half-section structure of a pressure relief valve embodiment of the utility model (without the valve seat);

[0030] The reference numerals in the drawings of the specification include:

[0031] Valve seat 1, joint 10, inlet end 11, outlet end 12, groove 13, sealing member 2, valve body 3, support ring 30, through hole 300, push rod 4, sealing head 40, sealing ring 400, force applying member 5, threaded hole 50, sliding member 6. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Among them, the drawings are only used for exemplary explanations, and they only show schematic diagrams rather than actual drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar parts; in the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like appear, the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, so the terms describing the positional relationship in the drawings are only used for exemplary explanations, and cannot be understood as limitations on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] like Figure 1 - Figure 7 As shown, a pressure relief valve of the utility model comprises a valve seat 1, a sealing member 2 and a valve body 3;

[0035] The valve seat 1 has an outlet end 12 and a joint 10 , and an inlet end 11 is arranged at the joint 10 . Specifically, the inlet end 11 is arranged at the bottom of the valve seat 1 , and the outlet end 12 is arranged at the side of the valve seat 1 .

[0036] The sealing member 2 has a V-shaped cross section and is disposed in the valve seat 1;

[0037] A groove 13 is formed on the inner bottom surface of the valve seat 1 , and the sealing member 2 is disposed in the groove 13 .

[0038] The valve body 3 is threadedly connected to the inner wall of the valve seat 1, and a push rod 4 is sleeved in the valve body 3. The push rod 4 has a sealing head 40 that conforms to the sealing element 2; and

[0039] A force applying member 5 is provided on the top of the valve body 3 to control the movement of the push rod 4 in the valve body 3 so that the sealing head 40 approaches or moves away from the sealing member 2;

[0040] After the push rod 4 is inserted into the seal 2, the pressure relief valve is in the cut-off state;

[0041] This pressure relief valve can achieve the basic pressure relief function. Since a seal 2 with a V-shaped cross section is arranged in the valve seat 1, the seal 2 is pressed against the bottom position of the valve body 3 by the push rod 4, and the sealing head 40 and the seal 2 fit more closely.

[0042] A support ring 30 is disposed at the bottom of the valve body 3 , and a through hole 300 communicating with the outlet end 12 is formed in the support ring 30 .

[0043] A sealing ring 400 is disposed at the rear end of the sealing head 40 .

[0044] The upper end of the valve body 3 is provided with a sliding member 6 sleeved on the outer periphery of the tail of the push rod 4. The cross section of the sliding member 6 is I-shaped. In order to prevent the sliding member 6 from escaping from the tail of the push rod 4 and driving the push rod 4 to rise, a clamping groove can be provided on the push rod 4, and the sliding member 6 cooperates with the clamping groove through a clamping spring. Specifically, the sliding member 6 is provided at the top of the valve body 3 and sleeved on the outer periphery of the push rod 4.

[0045] The seal 2 in this embodiment is subjected to the outward squeezing force of the inner wall by the sealing head 40, and the deformation that will occur during the fitting process is different from the ordinary sealing structure which adopts a flat form to avoid the adverse effects caused by irregular distortion, so that the reliability of high-pressure air pressure sealing is enhanced. At the moment of pressure relief, the various sealing accessories are not easily damaged. This design not only has a stable sealing effect, but is also durable.

[0046] Among them, a threaded hole 50 is opened on the side of the force-applying member 5, and the sliding member 6 is connected to the force-applying member 5 by means of a threaded pin cooperating with the threaded hole 50. Specifically, the cross-section of the sliding member 6 is I-shaped, and the head of the threaded pin extends into the groove 13 on the side of the sliding member 6. This arrangement makes disassembly and assembly more convenient.

[0047] It should be noted that the force-applying member 5 has various structural types, and can realize the function of moving the push rod 4, such as taking the form of a rotating part that is threadedly connected to the valve body 3 and sleeved on the outer periphery of the push rod 4, or taking the form of a pressure-lifting part that is directly connected to the push rod 4. The specific structural form is not limited.

[0048] Taking the rotating part as an example, a blind hole is provided in the middle for the rear end of the push rod 4 to be inserted, and a thread is provided on the inner wall of the blind hole to match the external thread of the valve body 3. When the force-applying member 5 is turned clockwise or counterclockwise by hand, the force-applying member 5 drives the push rod 4 to move upward or downward through the sliding member 6.

[0049] The above are only embodiments of the utility model. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field to which the utility model belongs before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A pressure relief valve, characterized in that: include: A valve seat having an outlet end and a joint, wherein the joint is provided with an inlet end; A sealing member, which has a V-shaped cross section and is disposed in the valve seat; A valve body connected to the valve seat, a push rod sleeved in the valve body, and the push rod has a sealing head conforming to the sealing element; and A force-applying member, used for controlling the movement of the push rod in the valve body to make the sealing head approach or move away from the sealing member; After the push rod is inserted into the sealing member for engagement, the pressure relief valve is in a cut-off state; A support ring is arranged at the bottom of the valve body, and a through hole communicating with the outlet is opened on the support ring.

2. A pressure relief valve according to claim 1, characterized in that: A sealing ring is arranged at the tail of the sealing head.

3. A pressure relief valve according to claim 1 or 2, characterized in that: The inner bottom surface of the valve seat is provided with a groove, and the sealing member is arranged in the groove.

4. A pressure relief valve according to claim 1 or 2, characterized in that: The force applying member comprises a rotating part which is threadedly connected with the valve body and sleeved on the outer periphery of the push rod.

5. A pressure relief valve according to claim 4, characterized in that: The upper end of the valve body is provided with a sliding member sleeved on the outer periphery of the push rod, and the cross section of the sliding member is in an I-shape.

6. A pressure relief valve according to claim 1, 2 or 5, characterized in that: A threaded hole is provided on the side of the force applying member.

7. A pressure relief valve according to claim 1, 2 or 5, characterized in that: The inlet end is arranged at the bottom of the valve seat, and the outlet end is arranged at the side of the valve seat.

8. A pressure relief valve according to claim 7, characterized in that: The valve body is threadedly connected to the inner wall of the valve seat.

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