Safety valve

Abstract

The utility model discloses a safety valve, belongs to the field of air pressure valves, and aims to solve the problems of how to adjust an opening critical value of the safety valve and how to reduce the risk of triggering adjustment due to accidental factors. The safety valve comprises a valve main body, a valve block, a spring, an adjusting screw rod and a protective cover; the valve body is provided with a valve cavity, an input hole communicated with the valve cavity and a pressure relief hole. The valve block is arranged in the valve cavity in an axial sliding mode and seals the input hole in a normal state. The spring is arranged in the valve cavity and applies pre-tightening force towards the input hole to the valve block; the adjusting screw is in threaded connection with the valve body, one end of the adjusting screw extends into the valve cavity and abuts against the spring, and the other end of the adjusting screw extends out of the valve body and is provided with an adjusting handle. The protective cover is detachably connected with the valve main body and covers the adjusting handle; when pressure applied to the valve block by a medium through the input hole pushes the valve block to open the input hole, the input hole is communicated with the pressure relief hole, and the medium enters the valve cavity through the input hole and is discharged through the pressure relief hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air pressure valves, in particular to a safety valve. BACKGROUND

[0002] The safety valve plays a vital role in the sintering furnace, and its normal state is closed to ensure the sealing of the equipment during normal operation. Once the air pressure inside the equipment or the connected pipeline abnormally rises beyond the preset safety range, the safety valve will automatically open to release the medium fluid to the outside of the system, thereby effectively preventing the pressure from exceeding the limit, which plays an important role in ensuring personnel safety and maintaining stable operation of the equipment.

[0003] In the prior art, the opening pressure threshold of the safety valve is usually designed in a fixed manner, which cannot meet the pressure adjustment requirements under different working conditions. Although some improved safety valves can adjust the threshold value through a threaded adjustment mechanism, the adjustment components lack protective structures, and the set value is easily deviated due to accidental touch or external force impact, causing the safety valve to open prematurely or fail. Therefore, there is an urgent need for a safety valve structure that has both adjustment flexibility and anti-interference performance.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE INVENTION

[0005] (I) Technical problems to be solved

[0006] The embodiments of the present application provide a safety valve, which can solve the problem of how to adjust the opening threshold of the safety valve in the prior art and reduce the risk of triggering adjustment due to accidental factors.

[0007] (II) Technical solutions

[0008] To solve the above technical problems, the present application provides the following technical solutions:

[0009] A safety valve is provided, which comprises a valve body, a valve block, a spring, an adjustment screw and a protective cover.

[0010] The valve body is provided with a valve cavity, an input hole and a pressure relief hole communicating with the valve cavity.

[0011] The spring and the valve block are axially slidably arranged in the valve cavity.

[0012] The adjustment screw is threadedly connected with the valve body, one end of the adjustment screw is screwed into the valve cavity to compress the spring, forcing the spring to apply a pre-tightening force to the valve block towards the input hole, so that the valve block seals the input hole, and the other end of the adjustment screw extends to the outside of the valve body and is provided with an adjustment handle.

[0013] The protective cover is detachably connected with the valve body and covers the adjusting handle;

[0014] Wherein, when the pressure of the medium applied to the valve block through the input hole pushes the valve block to open the input hole, the input hole is in communication with the pressure relief hole, the medium enters the valve cavity through the input hole and is discharged through the pressure relief hole.

[0015] Wherein, when the pressure of the medium applied to the valve block through the input hole is greater than a preset value, the valve block opens the input hole, the medium enters the valve cavity through the input hole and is discharged through the pressure relief hole.

[0016] In some embodiments, the protective cover has a cover body and a connecting plate radially extending from the bottom of the cover body, the cover body covers the adjusting handle, and the connecting plate is connected with the valve body through bolts; the connecting plate is provided with a guide shaft extending along the axis of the adjusting screw, and the valve body is provided with a guide hole in a position corresponding to the guide shaft and in clearance fit with the guide shaft.

[0017] In some embodiments, the safety valve further comprises a pressure block, which is arranged between the spring and the adjusting screw and has a cross-sectional dimension greater than the diameter of the end of the adjusting screw.

[0018] In some embodiments, the opposite end surfaces of the valve block and the pressure block are respectively provided with coaxial limiting grooves, and the two ends of the spring are respectively embedded in the limiting grooves of the valve block and the pressure block.

[0019] In some embodiments, the safety valve further comprises a gasket, which is arranged between the pressure block and the adjusting screw and has a cross-sectional dimension between the cross-sectional dimensions of the adjusting screw and the pressure block.

[0020] In some embodiments, the valve body comprises a valve body and a valve cover, the valve body is provided with a valve cavity and is provided with the pressure relief holes in the circumferential direction of the valve cavity, the valve cover is sealingly connected to the open end of the valve body, the valve cover is provided with the input hole at the center, and the valve cavity, the input hole, the valve block, the spring and the adjusting screw are coaxially arranged.

[0021] In some embodiments, the pressure relief holes are at least three and are uniformly arranged in the circumferential direction of the valve body.

[0022] In some embodiments, the valve block seals the input hole through a sealing ring.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0025] The safety valve of the present application is connected with the medium pressure (such as gas pressure) in the equipment (such as sintering furnace) through the input hole. When the equipment is working normally, the safety valve provides the pre-tightening force for the valve block through the spring, so that the valve block can seal the input hole to prevent the medium from leaking. When the medium pressure is greater than the pre-tightening force of the spring, the medium pressure pushes the valve block to open the input hole, so that the medium can enter the valve cavity from the input hole and then flow out from the pressure relief hole, thereby reducing the internal gas pressure of the equipment. Since the protective cover is detachably connected with the valve body, when the opening critical value of the safety valve is adjusted, the protective cover can be detached, so that the operator can control the rotation of the adjusting screw through the adjusting handle, and then finely adjust the pre-tightening force of the spring. After adjustment, the protective cover is reconnected with the valve body and covers the adjusting handle, thereby reducing the risk of triggering the adjusting handle due to accidental factors such as accidental touch, and improving the stability and reliability of the safety valve in use.

[0026] Further, since the opening critical value can be finely adjusted through the adjusting screw, the safety valve has a low medium leakage rate when working normally in a micro-pressure and vacuum environment, and can quickly respond to the small pressure change in the micro-pressure and vacuum environment, thereby meeting the pressure setting requirements of different micro-pressure or vacuum systems, effectively protecting the system safety, having a high sensitivity, and ensuring the pressure stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a perspective view of the safety valve in the embodiment of the present application;

[0029] Figure 2 is an exploded view of the safety valve in the embodiment of the present application;

[0030] Figure 3 is a bottom view of the safety valve in the embodiment of the present application;

[0031] Figure 4 is a sectional perspective view of section A in Figure 3

[0032] Figure 5 is a front view of the safety valve in the embodiment of the present application;

[0033] Figure 6 is a sectional plan view of section B in Figure 5

[0034] REFERENCE SIGNS: ​​

[0035] Valve body 1, valve cavity 11, input hole 12, pressure relief hole 13, valve body 14, valve cover 15, guide hole 16, rotation stop ring 17, convex shaft 18, moving ring 19;

[0036] Valve block 2, sealing ring 21, limiting groove 22;

[0037] Spring 3;

[0038] Adjusting screw 4, adjusting handle 41, guide bar 42, guide groove 43, positioning hole 44;

[0039] Protective cover 5, cover body 51, connecting plate 52, bolt 53, guide shaft 54;

[0040] Pressing block 6, gasket 7.

[0041] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Most of the safety valves on the market are pre-set with fixed opening critical values, which are difficult to adjust flexibly to adapt to diversified application requirements. Although some safety valve designs allow adjustment of the critical value, these designs often have the problem of being easily triggered by accidental factors to adjust the critical value, thereby affecting the stability and reliability of their use.

[0045] To solve the above technical problems, the present embodiment provides a safety valve. Referring to Figures 1 to 4 shown, Figure 1 is a perspective view of the safety valve in the embodiments of the present application, Figure 2 is an exploded view of the safety valve in the embodiments of the present application, Figure 3 is a bottom view of the safety valve in the embodiments of the present application, Figure 4 is Figure 3 is a sectional perspective view of section A in

[0046] The safety valve comprises a valve body 1, a valve block 2, a spring 3, an adjusting screw 4 and a protective cover 5. The valve body 1 is provided with a valve cavity 11, an input hole 12 and a pressure relief hole 13, the valve block 2 is axially slidably arranged in the valve cavity 11 and seals the input hole 12 in normal state, the spring 3 is axially slidably arranged in the valve cavity 11 and applies a pre-tightening force to the valve block 2 towards the input hole 12, the adjusting screw 4 is threadedly connected with the valve body 1, one end of the adjusting screw 4 extends into the valve cavity 11 and abuts against the spring 3, and the other end of the adjusting screw 4 extends to outside of the valve body 1 and is provided with an adjusting handle 41, and the protective cover 5 is detachably connected with the valve body 1 and covers the adjusting handle 41.

[0047] When the pressure of the medium applied to the valve block 2 through the input hole 12 is greater than a preset value, the medium pushes the valve block 2 to open the input hole 12, the input hole 12 is communicated with the pressure relief hole 13, the medium enters the valve cavity 11 through the input hole 12 and is discharged through the pressure relief hole 13.

[0048] For example, the valve block 2 seals the input hole 12 through a sealing ring 21, and the sealing ring 21 can be embedded in a groove of the valve block 2 or the valve body 1.

[0049] In one embodiment of the detachable connection between the protective cover 5 and the valve body 1, as shown in Figure 1 and Figure 4 the protective cover 5 has a cover body 51 and a connecting plate 52 extending radially from the bottom of the cover body 51, and can be an integral part, the cover body 51 is used to cover the adjusting handle 41, and the connecting plate 52 is connected with the valve body 1 through a bolt 53; the connecting plate 52 is provided with a guide shaft 54 extending along the axis of the adjusting screw 4, and the valve body 1 is provided with a guide hole 16 corresponding in position to the guide shaft 54 in clearance fit. For example, the guide shaft 54 is a stainless steel cylinder, and the guide shaft 54 is connected with the connecting plate 52 in threaded connection or interference fit and is in clearance fit with the guide hole 16 on the valve body. When the protective cover 5 is detached and installed, the guide shaft 54 guides the cover body 51 to translate along the axis of the adjusting screw 4 to be detached or installed, so as to avoid lateral collision with the adjusting handle 41 and accidental triggering of the adjustment of the pre-tightening force of the spring 3.

[0050] In another embodiment of the detachable connection between the protective cover 5 and the valve body 1 (not shown), the protective cover 5 is connected with one side of the valve body 1 through a pin shaft and connected with the other side through a buckle.

[0051] In order to improve the uniformity of the pre-tightening force of the spring 3, as shown in Figure 2 and Figure 4 the safety valve further comprises a pressing block 6, the pressing block 6 is arranged between the spring 3 and the adjusting screw 4, and the cross-sectional dimension of the pressing block 6 is greater than the diameter of the end of the adjusting screw 4, and the adjusting screw 4 changes the pre-tightening force of the spring 3 by axially moving the pressing block 6. The diameter of the pressing block 6 is greater than the diameter of the end of the adjusting screw 4, so as to ensure uniform pressure on the end surface of the spring 3.

[0052] For example, the bottom surface of the pressing block 6 is processed with an annular groove, and an O-shaped rubber ring is embedded in the groove to buffer the impact and vibration between the adjusting screw 4 and the pressing block 6.

[0053] Further, as shown in Figure 2 and Figure 4 , the opposite end surfaces of the valve block 2 and the pressing block 6 are respectively provided with coaxial limiting grooves 22, and the two ends of the spring 3 are respectively embedded in the limiting grooves 22 of the valve block 2 and the pressing block 6. For example, the depths of the limiting grooves 22 of the valve block 2 and the pressing block 6 are set according to requirements, and the coaxiality error is ≤0.05 mm, which ensures that the spring 3 does not deviate laterally.

[0054] In order to further improve the uniformity of the pre-tightening force of the spring 3, as shown in Figure 2 and Figure 4 , the safety valve further comprises a gasket 7, which is arranged between the pressing block 6 and the adjusting screw 4, and the cross-sectional dimension of the gasket 7 is between the cross-sectional dimensions of the adjusting screw 4 and the pressing block 6. For example, the gasket 7 is made of brass and is fixed to the end surface of the adjusting screw 4 by laser welding.

[0055] In one embodiment of the valve body 1, as shown in Figure 2 and Figure 4 , the valve body 1 comprises a valve body 14 and a valve cover 15, the valve body 14 is provided with a valve cavity 11 and a pressure relief hole 13, the valve cover 15 is sealingly connected to the open end of the valve body 14 by a bolt 16, the valve cover 15 is provided with an input hole 12 in the center, and the valve cavity 11, the input hole 12, the valve block 2, the spring 3 and the adjusting screw 4 are coaxially arranged. In this way, the pressure of the medium on the valve block 2, the pre-tightening force of the spring 3 and the force of the screw can act on each other in the same direction, thereby improving the stability of the overall structure of the safety valve.

[0056] Further, as shown in Figure 5 and Figure 6 , Figure 5 is a front view of the safety valve in the embodiment of the application, Figure 6 is a sectional view of the B section in Figure 5 , and the pressure relief hole 13 is provided with at least three and is uniformly arranged around the valve body 14. In this way, the medium pressure can be uniformly released from each pressure relief hole 13, further improving the stability of the safety valve structure and the reliability during the pressure relief process.

[0057] In order to further avoid accidental rotation of the adjusting screw 4, as shown in Figure 4As shown, the valve body 14 is welded or integrally formed with a rotation-stopping ring 17, the rotation-stopping ring 17 is provided with a protruding shaft 18, the exposed part of the screw rod is sleeved with a moving ring 19 in a slidable manner, the screw rod is provided with an axially extending guide strip 42, the moving ring 19 is provided with a guide groove 43 in a clearance fit with the guide strip 42, so that the moving ring 19 can slide up and down relative to the screw rod and cannot rotate, at the same time, the rotation-stopping ring 17 is provided with a positioning hole 44 matched with the protruding shaft 18, in a normal state, the protruding shaft 18 extends into the positioning hole 44, the screw rod and the moving ring 19 cannot rotate, only when the moving ring 19 is moved to make the protruding shaft 18 disengage from the positioning hole 44, the screw rod and the moving ring 19 can rotate, the adjustment of the pre-tightening force of the spring 3 is realized, the risk of accidental rotation of the adjusting screw rod 4 is further reduced, at the same time, the rotation-stopping ring 17 and the moving ring 19 can block the entry of external dust or foreign matter into the valve body 14 from the threaded hole position of the valve body 14, and play a protective role.

[0058] In summary, the safety valve of the above technical scheme is connected with the medium pressure (such as gas pressure) in the equipment (such as a sintering furnace) through the input hole 12, when the equipment is normally working, the safety valve provides a pre-tightening force for the valve block 2 through the spring 3, so that the valve block 2 can seal the input hole 12 to prevent medium leakage; when the medium pressure is large enough to push the valve block 2 to open the input hole 12, the medium can enter the valve cavity 11 from the input hole 12 and then flow out from the pressure relief hole 13, so as to reduce the internal gas pressure of the equipment. Among them, since the protective cover 5 is detachably connected with the valve body 1, when the opening threshold of the safety valve is adjusted, the protective cover 5 can be detached, so that the operator can control the rotation of the adjusting screw rod 4 through the adjusting handle 41, and then finely adjust the pre-tightening force of the spring 3; after adjustment, the protective cover 5 is reconnected with the valve body 1 and covers the adjusting handle 41, reducing the risk of triggering the adjusting handle 41 due to accidental factors such as accidental touch, thereby improving the stability and reliability of the safety valve in use.

[0059] Further, since the opening threshold can be finely adjusted by the adjusting screw rod 4, the safety valve has a low medium leakage rate when normally working in a micro-pressure and vacuum environment, and can quickly respond to small pressure changes in the micro-pressure and vacuum environment, meeting the pressure setting requirements of different micro-pressure or vacuum systems, effectively protecting the system safety, and having the advantages of high sensitivity, ensuring the pressure stability of the equipment.

[0060] The above description is only an optional embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A safety valve, characterized in that, include: Valve body, valve block, spring, adjusting screw, and protective cover; The valve body is provided with a valve cavity, an input port communicating with the valve cavity, and a pressure relief port; The spring and valve block are axially slidably disposed within the valve cavity; The adjusting screw is threadedly connected to the valve body, with one end screwed into the valve cavity to compress the spring, forcing the spring to apply a preload force toward the input hole to the valve block so that the valve block seals the input hole, and the other end extending to the outside of the valve body and having an adjusting handle. The protective cover is detachably connected to the valve body and covers the adjusting handle; When the medium applies pressure to the valve block through the input port, pushing the valve block to open the input port, the input port is connected to the pressure relief port, and the medium enters the valve cavity through the input port and is discharged through the pressure relief port.

2. The safety valve according to claim 1, characterized in that, The protective cover has a cover body and a connecting plate extending radially from the bottom of the cover body. The cover body covers the adjusting handle, and the connecting plate is connected to the valve body by bolts. The connecting plate is provided with a guide shaft extending along the axis of the adjusting screw, and the valve body has a guide hole that is clearance-fitted with the guide shaft at a corresponding position.

3. The safety valve according to claim 1, characterized in that, The safety valve also includes a pressure block, which is disposed between the spring and the adjusting screw, and its cross-sectional dimension is larger than the end diameter of the adjusting screw.

4. The safety valve according to claim 3, characterized in that, The valve block and the pressure block are respectively provided with coaxial limiting grooves on their opposite end faces, and the two ends of the spring are respectively embedded in the limiting grooves of the valve block and the pressure block.

5. The safety valve according to claim 3, characterized in that, The safety valve also includes a gasket, which is disposed between the pressure block and the adjusting screw, and its cross-sectional dimensions are between those of the adjusting screw and the pressure block.

6. The safety valve according to claim 1, characterized in that, The valve body includes a valve body and a valve cover. The valve body has a valve cavity and a pressure relief hole is provided around the valve cavity. The valve cover is sealed to the open end of the valve body. The valve cover has an input hole at its center. The valve cavity, input hole, valve block, spring and adjusting screw are coaxially arranged.

7. The safety valve according to claim 6, characterized in that, The pressure relief holes are provided in at least three locations and are evenly distributed around the circumference of the valve body.

8. The safety valve according to claim 1, characterized in that, The valve block seals the input port with a sealing ring.

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