Pressure release valve for gas cylinder

Abstract

The pressure release valve for the gas cylinder comprises a valve seat and a valve element, when the pressure of the inner end of the valve seat is lower than a threshold value, the valve element blocks an exhaust channel, and when the pressure of the inner end of the valve seat is larger than the threshold value, an elastic supporting structure is pressed, the valve element moves, and the exhaust channel is opened for exhausting. The elastic supporting structure comprises a cylindrical mounting seat with an air outlet hole and an elastic spring arranged on the mounting seat, the elastic spring exerts elastic force on the valve element to enable the valve element to seal the exhaust channel, the outer side wall of the mounting seat is attached to the side wall of the exhaust channel, and at least one fixing groove is formed in the top of the outer side wall of the mounting seat. An annular boss is arranged at the outer end of the valve seat, and the inner side wall of the annular boss is pressed to form a limiting boss extending into the fixing groove. The fixing groove is formed in the mounting seat, the valve seat is extruded to deform to form the limiting boss extending into the fixing groove so as to tightly press the mounting seat, the fixing mode is stable in fixing, looseness cannot occur, and the pressure relief threshold value is kept stable in the using process.

Description

Technical Field

[0001] The utility model relates to a pressure relief valve, in particular to a pressure relief valve for gas cylinders. Background Art

[0002] The pressure relief valve can automatically open and close according to the working pressure of the system, and is generally installed on the equipment or pipeline of a closed system to protect the safety of the system.

[0003] Patent application No. CN201410033071.1 discloses a throttle seat for a safety valve of a cryogenic insulated gas cylinder, which includes a valve body, a return spring, a valve core, and an air outlet joint. The front end of the valve body is provided with an intake cavity and the rear end is provided with a moving cavity, and the intake cavity and the moving cavity are communicated. The air outlet joint is provided with an air outlet cavity and its front end is connected to the rear end of the valve body. The valve core and the return spring are located in the moving cavity. One end of the return spring abuts against the valve body, and the other end of the return spring abuts against the front end of the valve core. The outer diameter of the tail end of the valve core is larger than the inner diameter of the air outlet cavity, and the valve core is provided with a valve core ventilation channel. One end of the valve core ventilation channel communicates with the moving cavity, and the other end is in close contact with the air outlet joint; the outer wall of the front end of the air outlet joint is provided with an external thread, and the valve body is threadedly connected to the air outlet joint, and a sealing gasket is used for sealing at the connection.

[0004] In the above patent, the air outlet joint is installed by a threaded connection method, and the return spring abuts against the air outlet joint. The threaded connection structure has the disadvantages of difficult control of the tightening degree and easy loosening. Poor control of the tightening degree and loosening will both cause changes in the pressure relief threshold, resulting in problems such as inability to relieve pressure or leakage. Summary of the Utility Model

[0005] Based on the deficiencies in the prior art that the threaded connection structure is prone to loosening and the tightening degree is difficult to control, resulting in changes in the pressure relief threshold, the utility model provides a pressure relief valve for gas cylinders.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0007] Pressure relief valve for gas cylinder, including a valve seat installed at the pressure relief port of the gas cylinder. An exhaust passage is provided in the valve seat, and a valve core supported by an elastic support structure is provided in the exhaust passage. When the pressure at the inner end of the valve seat is lower than the threshold value, the valve core blocks the exhaust passage. When the pressure at the inner end of the valve seat is greater than the threshold value, the elastic support structure is compressed and the valve core moves to open the exhaust passage for exhaust. The elastic support structure includes a cylindrical mounting seat with air holes and a spring provided on the mounting seat. The spring applies an elastic force to the valve core to close the exhaust passage. The outer side wall of the mounting seat abuts against the side wall of the exhaust passage, and at least one fixing groove is provided at the top of the outer side wall of the mounting seat. An annular boss is provided at the outer end of the valve seat, and a limiting boss extending into the fixing groove is formed by pressing the inner side wall of the annular boss. Among them, the air holes include three arc-shaped strip holes and are distributed in an annular array; three groups of fixing grooves and limiting bosses are provided and correspond to each other one by one. In this solution, fixing grooves are provided on the mounting seat, and the valve seat is extruded to deform to form a limiting boss extending into the fixing groove to press the mounting seat tightly. This fixing method is firm and will not loosen, and the pressure relief threshold remains stable during use.

[0008] Preferably, a sliding groove is provided on the inner side wall of the valve seat, and a rib extending into the sliding groove and slidable along the sliding groove is provided on the mounting seat. Three groups of ribs and grooves are provided and correspond to each other one by one. The rib extending into the groove plays a role in positioning and limiting.

[0009] Preferably, a tightening plane for adapting to a tightening tool for tightening installation is provided on the outer side wall of the annular boss. The tightening plane is used for the tightening installation of the entire valve seat. In addition, it is also used for positioning to find the position that needs to be extruded and cooperate with a pressing device to extrude the annular boss to deform and extend into the fixing groove to form a limit.

[0010] Preferably, the inner side wall of the annular boss is a circular arc-shaped curved surface, and the diameter of the curved surface gradually increases from the inner end to the outer end. This structure can not only reduce the extrusion resistance, but also deform towards the thinner inner position during pressing, which is beneficial to extruding a part of the annular boss into the fixing groove.

[0011] Preferably, an external thread for threaded connection with the pressure relief port of the gas cylinder is provided on the valve seat. This external thread is used for threaded connection at the pressure relief port of the gas cylinder.

[0012] Preferably, an annular step is further provided on the valve seat, and a sealing ring is sleeved on the end face at the inner end of the annular step. The outer end of the sealing ring abuts against the step surface of the annular step, and the inner end of the sealing ring abuts against the periphery of the pressure relief port of the steel cylinder to form a seal when the pressure relief valve is connected to the steel cylinder.

[0013] Preferably, an annular groove is provided on the side wall of the end face at the inner end of the annular step, and the sealing ring is installed in the annular groove. In this solution, the annular groove is provided for installing the sealing ring to prevent the sealing ring from sliding.

[0014] Preferably, an annular abutting step is provided on the side wall of the exhaust passage. The inner end of the mounting seat abuts against the annular abutting step. A sleeve column with a jack is provided on the mounting seat. One end of the elastic spring is sleeved on the sleeve column, and an end cover is inserted at the jack.

[0015] Preferably, one end of the valve seat is provided with a sealing table with a pressure relief hole. Both ends of the valve core have cylindrical grooves. A circular sealing gasket is installed in the groove at one end, and an elastic spring is installed in the groove at the other end. Under the action of the elastic spring, the valve core makes the sealing gasket abut against the sealing table to block the pressure relief hole.

[0016] Preferably, the valve core and the valve seat are in clearance fit or the valve seat is provided with an exhaust groove, so that a communicating exhaust passage is formed in the valve seat when the valve core slides.

[0017] Compared with the prior art, the advantages of the present utility model are as follows: In this application, a fixing groove is provided on the mounting seat, and the valve seat is squeezed to deform to form a limiting boss extending into the fixing groove to press the mounting seat tightly. This fixing method is firm and will not loosen, and the pressure relief threshold remains stable during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 is a perspective view of the present application;

[0020] Figure 2 is an exploded view of the present application;

[0021] Figure 3 is an exploded view of the present application;

[0022] Figure 4 is a sectional view of the present application;

[0023] In the figure: 10. Valve seat; 100. Limiting boss; 101. Exhaust passage; 102. Annular boss; 1021. Curved surface; 1022. Tightening plane; 103. Abutting step; 104. Embedded groove; 105. External thread; 106. Annular step; 107. Pressure relief hole; 20. Valve core; 30. Mounting seat; 301. Air outlet; 302. Fixing groove; 303. Sleeve column; 304. Jack; 40. Elastic spring; 50. End cover; 60. Sealing ring; 70. Sealing gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present utility model.

[0025] It should be noted that like reference numerals represent like items in the following drawings. Therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0026] This embodiment mainly elaborates on the title of the pressure relief valve for gas cylinders, which is specifically as follows:

[0027] The pressure relief valve for gas cylinders, as Figures 1-4 shown, includes a copper valve seat 10 installed at the pressure relief port of the gas cylinder. An exhaust passage 101 is provided in the valve seat 10, and a valve core 20 supported by an elastic support structure is provided in the exhaust passage 101. When the pressure at the inner end of the valve seat 10 is lower than the threshold value, the valve core 20 blocks the exhaust passage 101. When the pressure at the inner end of the valve seat 10 is greater than the threshold value, the elastic support structure is compressed and the valve core 20 moves to open the exhaust passage 101 for exhaust. The elastic support structure includes a copper cylindrical mounting seat 30 with air holes 301 and a spring 40 provided on the mounting seat 30. The spring 40 applies an elastic force to the valve core 20 to close the exhaust passage 101. The outer side wall of the mounting seat 30 abuts against the side wall of the exhaust passage 101, and at least one fixing groove 302 is provided at the top of the outer side wall of the mounting seat 30. An annular boss 102 is provided at the outer end of the valve seat 10, and a limiting boss 100 extending into the fixing groove 302 is formed by compression on the inner side wall of the annular boss 102. Among them, the air holes 301 include three arc-shaped strip holes and are distributed in an annular array; three groups of fixing grooves 302 and limiting bosses 100 are provided and correspond to each other one by one. In this solution, the fixing groove 302 is provided on the mounting seat 30, and the valve seat 10 is squeezed to deform to form a limiting boss 100 extending into the fixing groove 302 to press the mounting seat 30 tightly. This fixing method is firm and will not loosen, and the pressure relief threshold remains stable during use.

[0028] Preferably, a sliding groove is provided on the inner side wall of the valve seat 10, and a rib extending into the sliding groove and slidable along the sliding groove is provided on the mounting seat 30. Three groups of ribs and grooves are provided and correspond to each other one by one. The ribs extending into the grooves play a role in positioning and limiting. The structure in this solution is not shown in the drawings.

[0029] Preferably, the outer side wall of the annular boss 102 is provided with a tightening plane 1022 for adapting to a tightening tool for tightening installation. There are three tightening planes 1022 which are distributed in an annular array. They are used for the tightening installation of the entire valve seat 10. In addition, they are also used for positioning to find the position that needs to be extruded and cooperating with a pressing device to extrude the annular boss 102 to deform it and extend into the fixing groove 302 to form a limit. The tightening tool mentioned above can be a wrench or the like.

[0030] Preferably, the inner side wall of the annular boss 102 is a circular arc surface 1021, and the diameter of the arc surface 1021 gradually increases from the inner end to the outer end. This structure can not only reduce the resistance of extrusion, but also deform towards the thinner position on the inner side when being pressed down, which is beneficial to extruding a part of the annular boss 102 into the fixing groove 302.

[0031] Preferably, the valve seat 10 is provided with an external thread 105 for threaded connection with the pressure relief port of the gas cylinder. The external thread 105 is used for threaded connection at the pressure relief port of the gas cylinder.

[0032] Preferably, the valve seat 10 is further provided with an annular step 106, and a sealing ring 60 is sleeved at the inner end face of the annular step 106. The outer end of the sealing ring 60 abuts against the step surface of the annular step 106, and the inner end of the sealing ring 60 abuts against the periphery of the pressure relief port of the steel cylinder to form a seal when the pressure relief valve is connected to the steel cylinder.

[0033] Preferably, an annular groove 104 is provided on the side wall at the inner end face of the annular step 106, and the sealing ring 60 is installed in the annular groove 104. By providing the annular groove 104 for installing the sealing ring 60 in this solution, the sealing ring 60 can be prevented from sliding.

[0034] Preferably, the side wall of the exhaust passage 101 is provided with an annular abutting step 103, the inner end of the mounting seat 30 abuts against the annular abutting step 103, the mounting seat 30 is provided with a sleeve column 303 with a jack 304, one end of the elastic spring 40 is sleeved on the sleeve column 303, and an end cover 50 is inserted at the jack 304.

[0035] Preferably, one end of the valve seat 10 is provided with a sealing platform with a pressure relief hole 107. Both ends of the valve core 20 have cylindrical grooves. A circular sealing gasket 70 is installed in the groove at one end, and an elastic spring 40 is installed in the groove at the other end. Under the action of the elastic spring 40, the valve core 20 makes the sealing gasket 70 abut against the sealing platform to block the pressure relief hole 107.

[0036] Preferably, the valve core 20 and the valve seat 10 are in clearance fit or the valve seat 10 is provided with an exhaust groove, so that a communicating exhaust passage 101 is formed in the valve seat 10 when the valve core 20 slides.

[0037] The above has introduced the title provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the present utility model and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A pressure relief valve for a gas cylinder, comprising a valve seat installed at a pressure relief port of the gas cylinder, an exhaust passage being provided in the valve seat and a valve core supported by an elastic support structure being provided in the exhaust passage, when the pressure at the inner end of the valve seat is lower than a threshold value, the valve core blocks the exhaust passage, and when the pressure at the inner end of the valve seat is higher than the threshold value, the elastic support structure pressurized valve core moves and opens the exhaust passage to exhaust, characterized in that: The elastic support structure includes a cylindrical mounting seat with an air outlet and an elastic spring arranged on the mounting seat. The elastic spring applies elastic force to the valve core so that the valve core closes the exhaust channel. The outer wall of the mounting seat is in contact with the side wall of the exhaust channel and at least one fixing groove is provided at the top of the outer wall of the mounting seat. An annular boss is provided at the outer end of the valve seat, and the inner wall of the annular boss is compressed to form a limiting boss extending into the fixing groove.

2. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: The inner side wall of the valve seat is provided with a sliding groove, and the mounting seat is provided with a convex rib which extends into the sliding groove and can slide along the sliding groove.

3. The pressure relief valve for a gas cylinder according to claim 2, characterized in that: The outer side wall of the annular boss is provided with a tightening plane for adapting a tightening tool for tightening installation.

4. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: The inner side wall of the annular boss is a circular curved surface, and the diameter of the curved surface gradually increases from the inner end to the outer end.

5. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: The valve seat is provided with an external thread for threaded connection with the pressure relief port of the gas cylinder.

6. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: An annular step is also provided on the valve seat, and a sealing ring is sleeved on the inner end surface of the annular step.

7. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: An annular embedding groove is arranged on the side wall at the inner end surface of the annular step, and the sealing ring is installed in the annular embedding groove.

8. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: The exhaust passage side wall is provided with a circular abutting step, the inner end of the mounting seat abuts against the circular abutting step, the mounting seat is provided with a sleeve column with a socket, one end of the elastic spring is sleeved on the sleeve column, and an end cover is inserted at the socket.

9. The pressure relief valve for a gas cylinder according to claim 1, characterized in that: A sealing platform with a pressure relief hole is provided at one end of the valve seat, and cylindrical grooves are provided at both ends of the valve core. A circular sealing gasket is installed in the groove at one end, and an elastic spring is installed in the groove at the other end. Under the action of the elastic spring, the valve core makes the sealing gasket press against the sealing platform to seal the pressure relief hole.

10. The pressure relief valve for a gas cylinder according to claim 9, characterized in that: The valve core and the valve seat are clearance-matched or an exhaust groove is provided on the valve seat, so that a communicating exhaust passage is formed in the valve seat when the valve core slides.

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