阅读说明：本技术 一种安全阀 (Safety valve ) 是由 王剑飞 倪建平 张取 于 2021-08-23 设计创作，主要内容包括：本发明提供了一种安全阀,包括阀体、阀帽、设于阀体内的阀杆、密封组件和套接于阀杆上的弹性复位机构,所述阀体设有进气口和泄压口,所述阀体内设有承载台,所述承载台设有外锥形承载面,所述密封组件包括密封垫和导向塞,密封垫设有与承载台配合的卡槽,卡槽内设有与外锥形承载面配合的内锥面,所述阀体内设有环绕承载台的凹槽,所述密封垫的下端可伸入凹槽内,所述弹性复位机构的两端分别抵于阀杆的台阶面和阀帽的台阶面,密封垫和导向塞通过上下运动以开闭泄压口。本发明避免外界物体对阀杆运动造成的干扰；能够进一步提高密封性能,提高安全阀的使用寿命。(The invention provides a safety valve which comprises a valve body, a valve cap, a valve rod arranged in the valve body, a sealing assembly and an elastic reset mechanism sleeved on the valve rod, wherein the valve body is provided with an air inlet and a pressure relief opening, a bearing table is arranged in the valve body, the bearing table is provided with an outer conical bearing surface, the sealing assembly comprises a sealing pad and a guide plug, the sealing pad is provided with a clamping groove matched with the bearing table, an inner conical surface matched with the outer conical bearing surface is arranged in the clamping groove, a groove surrounding the bearing table is arranged in the valve body, the lower end of the sealing pad can extend into the groove, two ends of the elastic reset mechanism respectively abut against a step surface of the valve rod and a step surface of the valve cap, and the sealing pad and the guide plug move up and down to open and close the pressure relief opening. The invention avoids the interference of the external object to the movement of the valve rod; the sealing performance can be further improved, and the service life of the safety valve is prolonged.)

1. The utility model provides a safety valve, includes valve body, valve cap, locates valve rod, seal assembly in the valve body and cup joints the elasticity canceling release mechanical system on the valve rod, the valve body is equipped with air inlet and pressure release mouth, a serial communication port, be equipped with the plummer in the valve body, the plummer is equipped with outer toper loading end, seal assembly including sealed pad and direction stopper, sealed pad be equipped with plummer complex draw-in groove, be equipped with in the draw-in groove with outer toper loading end complex inner conical surface, be equipped with the recess that encircles the plummer in the valve body, sealed lower extreme of filling up can stretch into in the recess, elasticity canceling release mechanical system's both ends support respectively in the step face of valve rod and the step face of valve cap, sealed pad and direction stopper through the up-and-down motion with switching pressure release mouth.

2. The safety valve according to claim 1, wherein a support surface is provided in the valve body in contact with the lower end surface of the pilot plug and around the periphery of the groove, the support surface lying in a plane between the bottom of the groove and the top end of the gasket.

3. The safety valve according to claim 1, wherein the bottom end surface of the guide plug is provided with a first mounting groove for mounting the gasket, and the upper portion of the guide plug is provided with a second mounting groove for mounting the valve stem.

4. The safety valve according to claim 3, wherein the outer side of the packing is provided with an outer tapered surface, and a gap is formed between the inner side surface of the first mounting groove and the outer tapered surface of the lower end of the packing.

5. The safety valve according to claim 1, further comprising a steel ball, wherein a first receiving groove is formed at the bottom of the step surface of the valve rod, a second receiving groove corresponding to the first receiving groove is formed in the guide plug, and the steel ball is arranged in a receiving space defined by the first receiving groove and the second receiving groove.

6. The safety valve according to claim 1, wherein the valve cap comprises a connecting section and a protruding section, the connecting section and the protruding section form a convex structure, a stepped groove is formed in the connecting section, the upper portion of the valve rod can extend into the stepped groove, and the step surface of the stepped groove forms a limit for the elastic return mechanism and the step surface of the valve rod.

7. The safety valve of claim 1, wherein the resilient return mechanism is a return spring.

8. The safety valve of claim 1, wherein the outer side surface of the guide plug comprises a plane surface and an arc surface which are arranged at intervals, and the pressure relief port is arranged on the side wall of the valve body corresponding to the arc surface.

9. The safety valve of claim 1, wherein the pressure relief port is a circular hole.

Technical Field

The invention relates to the technical field of valves, in particular to a safety valve.

Background

The safety valve is a special valve, wherein the opening and closing part is in a normally closed state under the action of external force, and when the pressure of a medium in equipment or a pipeline rises to exceed a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or the equipment from exceeding the specified value. The reliability and performance of the action are directly related to the safety of equipment and personnel.

Safety valves are classified into a hammer type, a lever type, a spring type and a pilot type (pulse type) according to structural forms. The bottom of a valve rod of the spring type safety valve is generally in direct contact with a sealing gasket, and the end part of the valve rod can move out of the valve body and is easily interfered by an external object; moreover, after the spring type safety valve is continuously in a closed and pressure relief switching state, the situation that the sealing effect is poor due to the fact that the valve rod cannot be effectively reset easily occurs. When the mine is used under the complex working condition, the safety performance cannot be guaranteed, and the safety of operators is endangered. Secondly, the pressure relief channel of the safety valve is not designed reasonably and is not easy to relieve pressure quickly. Moreover, the valve rod is easy to break and cut due to long-term reciprocating motion, and the generated broken and cut and other impurities are deposited on the inner sealing surface of the valve body to influence the sealing effect.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art. Therefore, the invention provides a safety valve, which aims to improve the sealing property during closing, realize quick pressure relief and improve the safety.

Based on the above purpose, the invention provides a safety valve, which comprises a valve body, a valve cap, a valve rod arranged in the valve body, a sealing assembly and an elastic reset mechanism sleeved on the valve rod, wherein the valve body is provided with an air inlet and a pressure relief opening, a bearing table is arranged in the valve body, the bearing table is provided with an outer conical bearing surface, the sealing assembly comprises a sealing pad and a guide plug, the sealing pad is provided with a clamping groove matched with the bearing table, an inner conical surface matched with the outer conical bearing surface is arranged in the clamping groove, a groove surrounding the bearing table is arranged in the valve body, the lower end of the sealing pad can extend into the groove, two ends of the elastic reset mechanism respectively abut against a step surface of the valve rod and a step surface of the valve cap, and the sealing pad and the guide plug move up and down to open and close the pressure relief opening.

The valve body is internally provided with a supporting surface which is contacted with the lower end surface of the guide plug and is arranged on the periphery of the groove in a surrounding way, and the plane of the supporting surface is positioned between the bottom of the groove and the top end of the sealing gasket.

The bottom face of direction stopper is equipped with the first mounting groove that is used for the sealed pad of installation, and the upper portion of direction stopper is equipped with the second mounting groove of installation valve rod.

The outer side of the sealing gasket is provided with an outer conical surface, and a gap is formed between the inner side surface of the first mounting groove and the outer conical surface at the lower end of the sealing gasket.

The safety valve further comprises a steel ball, a first accommodating groove is formed in the bottom of the step surface of the valve rod, a second accommodating groove corresponding to the first accommodating groove is formed in the guide plug, and the steel ball is arranged in an accommodating space formed by the first accommodating groove and the second accommodating groove in a surrounding mode.

The valve cap includes linkage segment and protruding section, linkage segment and protruding section form protruding type structure, be equipped with the step groove in the linkage segment, the upper portion of valve rod can stretch into the step inslot, and the step face of the step groove in the face of the step of elastic reset mechanism and valve rod forms spacingly.

The elastic reset mechanism is a reset spring.

The lateral surface of direction stopper includes plane and the cambered surface that the looks interval set up, the pressure release mouth is located on the valve body lateral wall that the cambered surface corresponds.

The pressure relief port is a round hole. Arrange the lateral wall at the valve body, the design of round hole can improve the pressure release speed to a great extent, and is more favorable to the valve body keeps structural strength.

The invention has the beneficial effects that:

1. the valve rod moves in the valve body, so that the interference of an external object on the movement of the valve rod is avoided; the setting of direction stopper, as the structure of transition installation, the assembly of sealed pad and valve rod of being convenient for, the direction stopper forms fine cooperation contact surface in the valve body simultaneously, can further improve sealing performance. When the pressure is overlarge, the sealing gasket and the guide plug synchronously push the valve rod to move towards the direction of the extension section in the valve cap, so that the pressure relief opening is opened, and the rapid pressure relief is facilitated.

2. The groove is arranged in the valve body, so that the broken pieces and other impurities generated when the sealing gasket acts for a long time are effectively collected, and the sealing is prevented from being influenced by the fact that particles on the sealing surface are deposited on the sealing surface and the inner wall of the valve body.

3. The guide plug is provided with a plane and an arc surface, so that the contact area with the inner wall of the valve body is reduced, the movement friction resistance is effectively reduced, and meanwhile, the guide movement of the sealing assembly in the opening and closing process is effectively realized.

4. The contact surfaces of the valve rod and the guide plug adopt acting force to be transmitted through the steel balls, so that the acting force of the spring is ensured to be concentrated and distributed on the guide plug, and the inclination of the spring is prevented and balanced.

5. Effectively prolong the service life of the safety valve.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of the safety valve of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic view of the structure of the gasket of the present invention;

FIG. 4 is a cross-sectional view of a gasket of the present invention;

FIG. 5 is a schematic structural view of a bonnet according to the present invention;

FIG. 6 is a cross-sectional view of the bonnet.

Labeled as:

1. a valve body; 2. a bonnet; 21. a step of the bonnet; 22. a protruding section; 23. a connecting section; 3. a return spring; 4. a valve stem; 41. a step surface of the valve stem; 5. a guide plug; 51. a plane; 52. a cambered surface; 6. a gasket; 61. a card slot; 62. an inner conical surface; 63. a flange; 64. an outer conical surface; 7. a pressure relief port; 8. steel balls; 9. an air inlet; 10. and (4) a groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1 to 6, the present invention relates to a safety valve, which includes a valve body 1, a bonnet 2, a valve rod 4 disposed in the valve body 1, a sealing assembly, and an elastic resetting mechanism sleeved on the valve rod 4, wherein the valve body 1 is provided with an air inlet 9 and a pressure relief opening 7, a bearing table is disposed in the valve body 1, the bearing table is provided with an external conical bearing surface, the sealing assembly includes a sealing gasket 6 and a guide plug 5, the sealing gasket 6 is provided with a clamping groove 61 matched with the bearing table, an internal conical surface 62 matched with the external conical bearing surface is disposed in the clamping groove 61, a groove 10 surrounding the bearing table is disposed in the valve body 1, a lower end of the sealing gasket 6 can extend into the groove 10, two ends of the elastic resetting mechanism respectively abut against a step surface of the valve rod 4 and a step surface of the bonnet 2, and the sealing gasket 6 and the guide plug 5 move up and down to open and close the pressure relief opening 7. According to the safety valve with the structure, the valve rod moves in the valve body, so that the interference of an external object on the movement of the valve rod is avoided; the setting of direction stopper, as the structure of transition installation, the assembly of sealed pad and valve rod of being convenient for, the direction stopper forms fine cooperation contact surface in the valve body simultaneously, can further improve sealing performance. When the pressure is overlarge, the sealing gasket and the guide plug synchronously push the valve rod to move towards the direction of the extension section in the valve cap, so that the pressure relief opening is opened, and the rapid pressure relief is facilitated. Set up the recess in valve body inside, effectively collect the bits of broken glass that sealed pad produced when moving for a long time and cut and other impurity, prevent on the sealed face particulate matter deposit on sealed face and valve body inner wall and influence sealed.

Wherein, the elastic reset mechanism is a reset spring 3. The valve body is of a cavity structure and is provided with the air inlet 9 and the pressure relief opening 7, the bearing platform arranged inside the valve body is in a boss shape and protrudes upwards, and the bearing platform is provided with an outer conical bearing surface so as to be convenient for matching and assembling with the corresponding inner conical surface of the sealing gasket. The pressure relief port 7 is preferably a round hole and is arranged on the side wall of the valve body, the pressure relief speed can be improved to a greater extent by the design of the round hole, and the valve body can keep structural strength.

As shown in fig. 2, a support surface contacting with the lower end surface of the guide plug 5 and surrounding the periphery of the groove 10 is provided in the valve body 1, and the plane 51 of the support surface is located between the bottom of the groove 10 and the top end of the seal gasket 6. This holding surface contacts with the lower extreme bottom surface of direction stopper, plays the effect of supporting the direction stopper, and at direction stopper lift reciprocating motion's in-process, the holding surface has born the weight of the effort of the most of direction stopper to solve the problem that sealed pad excessive pressure leads to plastic deformation.

As shown in fig. 1 and 2, a first mounting groove for mounting the sealing gasket 6 is formed on the bottom end surface of the guide plug 5, and a second mounting groove for mounting the valve rod 4 is formed on the upper portion of the guide plug 5. During the assembly, sealed the pad and install in first mounting groove, the valve rod is installed in the second mounting groove.

As shown in fig. 3 and 4, an outer tapered surface 64 is provided on the outer side of the gasket 6, and a gap is formed between the inner surface of the first mounting groove and the outer tapered surface 64 at the lower end of the gasket 6. Particularly, sealed the pad is provided with draw-in groove 61, encircle the draw-in groove be flange 62, be provided with interior conical surface 63 around the draw-in groove, interior conical surface towards the bottom slope of draw-in groove and with the sealed face cooperation of the outer toper of plummer, the lateral surface of flange 62 is the outer conical surface, after sealed pad installation in the first mounting groove of direction stopper, form the clearance between the inner surface of outer conical surface and direction stopper lower extreme to the sealed face material elastic deformation of cooperation effectively prolongs the life of relief valve.

As shown in fig. 2, the safety valve further comprises a steel ball 8, a first accommodating groove is formed in the bottom of the step surface of the valve rod 4, a second accommodating groove corresponding to the first accommodating groove is formed in the guide plug 5, and the steel ball 8 is arranged in an accommodating space formed by the first accommodating groove and the second accommodating groove in a surrounding mode. The contact surfaces of the valve rod and the guide plug adopt acting force to be transmitted through the steel balls, so that the acting force of the spring is ensured to be concentrated and distributed on the guide plug, and the inclination of the spring is prevented and balanced.

As shown in fig. 5 and 6, the bonnet 2 includes a connecting section 23 and a protruding section 22, the connecting section 23 and the protruding section 22 form a convex structure, a step groove is provided in the connecting section 23, the upper portion of the valve rod 4 can extend into the step groove, and the step surface of the step groove facing the return spring and the valve rod 4 forms a limit. Under the normal pressure state, the sealing gasket and the guide plug close the air inlet under the action of the valve rod and the return spring, so that the safety valve is in a normally closed state; under the overpressure state, media in equipment or a pipeline impact the sealing gasket, the return spring is compressed under the action of the overpressure media, the valve rod moves towards the extending section of the valve cap, and the air inlet is opened and communicated to the pressure relief opening, so that the safety valve is switched to the opening state to relieve pressure.

As a further improvement, as shown in fig. 1, the outer side surface of the guide plug 5 includes a flat surface 51 and an arc surface 52 which are arranged at intervals, and the pressure relief port 7 is arranged on the side wall of the valve body 1 corresponding to the arc surface 52. The guide plug is provided with a plane and an arc surface, so that the contact area with the inner wall of the valve body is reduced, the movement friction resistance is effectively reduced, and meanwhile, the guide movement of the sealing assembly in the opening and closing process is effectively realized.

As shown in figure 2, after the safety valve is assembled, a certain gap is formed between the flange on the sealing gasket and the bottom of the groove, so that the sealing gasket can rebound after action, and the problem of plastic deformation of the sealing gasket caused by overpressure is effectively solved.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.