CN216158390U - Safety valve and grease gun - Google Patents

Abstract

The utility model discloses a safety valve which comprises a valve body, an end cover, an ejector rod and an elastic piece, wherein the valve body is connected with the end cover to form a cavity for arranging the ejector rod, the ejector rod overcomes the elasticity of the elastic piece to move in the cavity during pressure relief, and the ejector rod moves to abut against the inner surface of the end cover before the elastic deformation of the elastic piece reaches the limit during pressure relief. Also discloses a grease gun based on the safety valve. When the pressure relief device is applied, the ejector rod moves to abut against the inner surface of the end cover before the elastic deformation of the elastic part reaches the limit during pressure relief, so that the acting force of the abutment of the ejector rod and the inner surface of the end cover is balanced with the pressure value of the pressure relief of the tool, and the elastic part cannot be excessively deformed to cause failure.

Description

Safety valve and grease gun

Technical Field

The utility model belongs to the field of safety pressure relief tools, and particularly relates to a safety valve and a grease gun.

Background

Some pressure-bearing tools or equipment need to be provided with safety valves for ensuring safe use, and the safety valves are opened to release pressure when the pressure is increased to a threshold value, so that the tools or equipment are prevented from being damaged by explosion due to overlarge pressure, and pressure-bearing electric tools such as grease guns and the like are avoided. The existing safety valve is generally provided with an ejector rod and a pressure spring in a valve body, the ejector rod is abutted to a pressure relief inflow hole of the tightly sealed valve body by the pressure spring, the elasticity of the pressure spring is preset to be smaller than a pressure bearing threshold value of equipment, the ejector rod is driven to overcome the elasticity of the pressure spring to move when the pressure reaches the threshold value, and the pressure relief inflow hole and the pressure relief outflow hole which are arranged on the valve body are communicated to complete pressure relief. Take electronic grease gun as an example, design safe pressure threshold P1 (the biggest safe design pressure of some electronic grease guns can reach 10000 ~ 15000psi at present), can cause instantaneous the pressure boost if the condition that takes place the butter jam, consequently install the relief valve for electronic grease gun, the pressure spring initial condition in general this relief valve is compressed to pressure-bearing value P2, P2< P1, this is because the relief valve pressure release needs certain time process, if design P2 for being equal with P1, because the pressure boost that the butter jam caused takes place in the short time, will lead to the speed of relief valve pressure to not catch up with the speed that the grease gun internal pressure rose, cause the pressure easily and exceed safe pressure threshold and cause the safety valve to damage. And because the reason of electronic grease gun self volume, the spring wire diameter of pressure spring and technological parameters such as effective number of turns are difficult to improve, just lead to the pressure spring that can apply to the grease gun to hardly process great working limit load, this just leads to the grease gun product on the existing market in the use, if take place the butter and block up and arouse to step up, very easily because instantaneous pressure is too big directly excessively compresses the pressure spring to plastic deformation, unable reconversion, cause the relief valve to scrap. Although safety accidents can be avoided, the safety valve needs to be replaced when pressure relief is caused by one-time blockage, so that the cost is increased and the maintenance frequency is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a safety valve and a grease gun, which can effectively solve the problem that an elastic part in the safety valve is easy to lose efficacy when the grease gun is decompressed in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme: the safety valve comprises a valve body, an end cover, an ejector rod and an elastic piece, wherein the valve body is connected with the end cover to form a cavity used for arranging the ejector rod, the ejector rod overcomes the elasticity of the elastic piece to move in the cavity during pressure relief, and before the elastic deformation of the elastic piece reaches the limit during pressure relief, the ejector rod moves to abut against the inner surface of the end cover.

Preferably, the elastic part is a pressure spring, the elastic part is sleeved on the ejector rod, one end of the elastic part is abutted against the inner surface of the end cover, and the other end of the elastic part is abutted against the front end of the ejector rod. The pressure spring is selected for use so as to be convenient for assembling with the valve body, the end cover and the ejector rod.

Preferably, the end cover is provided with an annular step, one end of the elastic part is abutted against the end face of the annular step, and the rear end of the ejector rod extends into a limiting groove formed by the annular step. After setting up like this at initial condition and during the pressure release, the full length of pressure spring all overlaps on the ejector pin, and the pressure spring can receive the spacing supporting role of ejector pin along radial when compressed, avoids the pressure spring to take place radial bending with the one end of end cover internal surface butt, prevents that the pressure spring from damaging. Meanwhile, the limiting groove can also limit the ejector rod, so that the ejector rod is prevented from jumping radially.

Preferably, the end cap is integrally formed with the valve body.

Preferably, the end cap is screwed on the valve body.

Preferably, be equipped with the threaded rod on the end cover, set up the internal thread with threaded rod looks adaptation in the valve body, the cover is equipped with the gasket on the threaded rod replaceably, the gasket is used for adjusting the length that the threaded rod stretched into the inner chamber. Therefore, the distance between the rear end of the ejector rod and the inner bottom surface of the end cover can be adjusted.

Preferably, the valve body is provided with a pressure relief inflow hole and a pressure relief outflow hole, the front end of the ejector rod abuts against and seals the pressure relief inflow hole, and the ejector rod moves to enable the pressure relief inflow hole to be communicated with the pressure relief outflow hole during pressure relief.

Preferably, the front end of the ejector rod is provided with a hemispherical groove, a steel ball is arranged in the hemispherical groove, the wall of the pressure relief inflow hole is provided with an annular groove matched with the surface of the steel ball, and the ejector rod tightly presses and seals the steel ball in the annular groove. This can improve the sealing performance.

Preferably, the front end of the ejector rod is provided with an annular boss, the front end of the annular boss is provided with a conical inclined plane, and the annular boss is further provided with a pressure relief groove. The conical inclined plane is beneficial to the rapid flow of fluid during pressure relief, and the pressure relief efficiency is improved. The annular boss may also be used to interact with the resilient member.

In order to solve the technical problems, the utility model also adopts the following technical scheme: a grease gun comprising a safety valve as claimed in any one of the preceding claims. This grease gun is owing to install above-mentioned relief valve, can avoid excessively compressing to deformation inefficacy with the elastic component in the relief valve when the pressure release to extension relief valve life effectively reduces the number of times of maintenance change relief valve, reduce cost, convenient to use.

Compared with the prior art, the utility model has the following beneficial effects: the ejector pin moving distance and the ejector pin act on the relation between the elastic part deformation degree through calculating when the pressure is released, the moving distance between the ejector pin and the inner surface of the end cover is set, the ejector pin is designed to be in the pressure release state before the elastic deformation of the elastic part reaches the limit, the ejector pin moves to abut against the inner surface of the end cover, the acting force of the ejector pin and the inner surface of the end cover is balanced with the pressure value of the tool pressure release, and the elastic part cannot excessively deform to cause failure.

Drawings

FIG. 1 is a schematic structural diagram of a safety valve provided in the first embodiment;

FIG. 2 is a cross-sectional view of a safety valve provided in an embodiment without venting;

FIG. 3 is a cross-sectional view of the safety valve in a first embodiment with pressure relief;

FIG. 4 is a schematic structural diagram of a lift pin in the first embodiment;

FIG. 5 is a cross-sectional view of the second embodiment of the safety valve when the safety valve is not depressurized;

fig. 6 is an exploded view of a safety valve provided in the third embodiment;

FIG. 7 is a cross-sectional view of the third embodiment of the safety valve when the safety valve is not depressurized;

fig. 8 is a cross-sectional view of the safety valve of the fourth embodiment when not depressurized.

Wherein: 1. the pressure relief valve comprises a valve body, 10 pressure relief inflow holes, 11 pressure relief outflow holes, 2 end covers, 20 annular steps, 200 limiting grooves, 21 threaded rods, 22 gaskets, 3 ejector rods, 30 hemispherical grooves, 31 annular bosses, 32 pressure relief grooves, 4 elastic pieces and 5 steel balls.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; may be directly connected or indirectly connected through an intermediate, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1 to 3, this embodiment provides a safety valve, including valve body 1, end cover 2, ejector pin 3 and elastic component 4, wherein the front end of valve body 1 is threaded for with the pressure-bearing tool fixed connection who has the pressure release demand, seted up pressure release inflow hole 10 at the front end of valve body 1, a plurality of pressure release outflow holes 11 have been seted up along circumference in the middle part of valve body 1, valve body 1 is connected with end cover 2 and is formed the cavity that is used for setting up ejector pin 3, end cover 2 makes with valve body 1 integrated into one piece in this embodiment. When the pressure is not released, the ejector rod 3 tightly abuts against and is sealed on the inner side of the pressure release inflow hole 10 under the elastic force action of the elastic piece 4, so that the pressure release inflow hole 10 and the pressure release outflow hole 11 cannot be communicated, and the pressure-bearing tool normally works at the moment. After the pressure inside the pressure-bearing tool is increased and exceeds the preset working load of the elastic part 4, the ejector rod 3 is pushed and overcomes the elasticity of the elastic part 4 to move backwards in the cavity, the elastic part 4 is further elastically deformed in the process, and the pressure relief inflow hole 10 and the pressure relief outflow hole 11 are communicated to start pressure relief, so that the pressure-bearing tool is prevented from being damaged. In this embodiment, when the safety valve is depressurized, the plunger 3 moves to abut against the inner surface of the cap 2 before the elastic deformation of the elastic member 4 reaches the limit. Also through 3 migration distance of ejector pin and 3 effects on the relation between the 4 deformation degrees of elastic component of ejector pin when calculating the pressure release, set up the removal interval of ejector pin 3 and 2 internal surfaces of end cover, before the elastic deformation of elastic component 4 reaches the limit when designing it as the pressure release, ejector pin 3 removes to 2 internal surface butt with the end cover, the effort that relies on 3 and 2 internal surface butt of end cover of ejector pin is balanced mutually with instrument pressure release value like this, elastic component 4 can not excessively deform and cause the inefficacy.

Specifically, in this embodiment, the elastic member 4 is a compression spring, the elastic member 4 is sleeved on the ejector rod 3, and the annular boss 31 is disposed at the front end of the ejector rod 3, so that the rear end of the elastic member 4 abuts against the inner surface of the end cover 2, and the front end of the elastic member 4 abuts against the annular boss 31. The safety pressure threshold value of the pressure-bearing tool is set to be P1, the distance between the rear end of the ejector rod 3 and the inner bottom surface of the end cover 2 is set to be L1, the pressure value which can be borne by the elastic piece 4 when the elastic piece 4 is compressed in advance to work load is set to be P2, the length of the corresponding elastic piece 4 at the moment is set to be L2, the pressure value which can be borne by the designed work limit load of the elastic piece 4 is set to be P3, the length of the corresponding elastic piece 4 at the moment is set to be L3, and L1 is less than L2-L3, so that the ejector rod 3 moves to be abutted against the inner surface of the end cover 2 before the elastic deformation of the elastic piece 4 reaches the limit during pressure relief, and the elastic piece 4 is prevented from being excessively compressed to cause failure. It should be noted that P2< P1 can ensure that the safety valve has enough pressure relief time to prevent the pressure-bearing tool from being pressurized too fast to cause pressure relief, and if P3 can be larger than P1, the elastic element 4 can ensure that the elastic element 4 can not be compressed excessively to cause failure, but due to the volume limitation of the tool such as a grease gun, the elastic element 4 with the working limit load larger than the safety pressure threshold P1 is difficult to manufacture, or the manufacturing cost is very high. By adopting the safety valve provided by the embodiment, the process parameter requirements of the elastic part 4 can be reduced, namely under the condition that P3 is smaller than P1, the safety can be ensured, and meanwhile, the elastic part 4 can be effectively prevented from being out of work. In addition, if the pressure value that the working load of the elastic element 4 can bear when the rear end of the ejector rod 3 is abutted against the inner bottom surface of the end cover 2 is set as P4, and of course, P4< P3, when the internal pressure of the pressure-bearing tool is relieved to be less than P4, the elastic element 4 pushes the push rod to move and return to the original position, and the pressure relief inflow hole 10 is abutted and sealed again.

It should be noted that, in the embodiment, the elastic member 4 is taken as a pressure spring for the reason that the pressure spring is convenient to assemble with the valve body 1 and the end cap 2, in practical applications, a torsion spring, a tension spring, an elastic sheet, or the like may also be taken as the elastic member 4, and how to utilize the elastic member 4 to tightly seal the ejector rod 3 on the pressure relief inflow hole 10 may be designed according to experience in the field.

As shown in fig. 4, in order to obtain good sealing performance in this embodiment, a hemispherical groove is further formed in the annular boss 31 at the front end of the ejector rod 3, a steel ball 5 is arranged in the hemispherical groove, and an annular groove adapted to the surface of the steel ball 5 is formed in the hole wall on the inner side of the pressure-releasing inflow hole 10, so that the steel ball 5 can be tightly abutted and sealed in the annular groove by using the hemispherical groove 30. Of course, it is preferable to fix the steel ball 5 in the hemispherical groove 30, so that the steel ball 5 is prevented from falling off during the pressure relief. In order to realize rapid and efficient pressure relief when pressure relief is needed, in the embodiment, the front end of the annular boss 31 is provided with the conical inclined surface, the annular boss 31 is further provided with the pressure relief groove 32, and the conical inclined surface is favorable for rapid flow of fluid during pressure relief, so that the pressure relief efficiency is improved.

Example two: as shown in fig. 5, the present embodiment also provides a safety valve, and the present embodiment is different from the above embodiments in that an annular step 20 is further provided on the inner surface of the end cap 2, the annular step 20 forms a limiting groove 200 into which the rear end of the push rod 3 extends, the rear end of the elastic member 4 abuts against the end surface of the annular step 20, and the rear end of the push rod 3 extends into the limiting groove 200 when the pressure is not released.

Based on the above different technical features, as can be seen from comparing fig. 5 and fig. 2, the elastic member 4 in this embodiment is completely sleeved on the ejector rod 3 in two different states of no pressure release and pressure release, so that the elastic member 4 can be compressed instantly and radially limited by the ejector rod 3, and the end of the elastic member 4 abutting against the inner surface of the end cover 2 is prevented from being radially bent, thereby preventing the pressure spring from being damaged. Meanwhile, the limiting groove 200 can also limit the ejector rod 3 to prevent the ejector rod 3 from jumping radially, so that the pressure relief channel can be kept smooth during pressure relief, and the pressure relief efficiency is prevented from being influenced.

Example three: as shown in fig. 6 and 7, the present embodiment also provides a safety valve, and the present embodiment is different from the first embodiment in that the end cap 2 and the valve body 1 are fixed by a threaded connection. Specifically, in this embodiment, the end cap 2 is provided with the threaded rod 21, and the inner surface of the valve body 1 is provided with the internal thread adapted to the threaded rod 21, so that the threaded rod 21 is screwed into the internal thread to realize the threaded fixed connection between the end cap 2 and the valve body 1, and it can be understood that the threaded rod 21 extending into the inner cavity needs to be provided with a groove for accommodating the elastic member 4 and the ejector rod 3 at the central position along the axial direction. By adopting the mode, the valve body 1 and the end cover 2 can be conveniently manufactured, the ejector rod 3 and the elastic piece 4 can be conveniently assembled in the inner cavity, and the residual substances in the inner cavity can be conveniently cleaned after pressure relief.

In this embodiment, the annular step 20 may be provided as in the second embodiment, that is, the threaded rod 21 extending into the inner cavity may be provided with the annular step 20 and form the limit groove 200 into which the rod 3 extends.

Example four: as shown in fig. 8, the difference between the present embodiment and the third embodiment is that in the present embodiment, the threaded rod 21 can be sleeved with the gasket 22 with different thicknesses, so that the length of the threaded rod 21 extending into the inner cavity can be adjusted, and then the distance between the rear end of the ejector rod 3 and the inner bottom surface of the end cover 2 can be adjusted, and accordingly, the size of the pressure value P4 that can be borne by the working load of the elastic member 4 when the rear end of the ejector rod 3 abuts against the inner bottom surface of the end cover 2 can be adjusted, and then the pressure value when the pressure relief is finished can be adjusted according to the design requirement of the pressure-bearing tool.

Example five: this embodiment provides a grease gun fitted with the safety valve provided in any of the above embodiments. This grease gun is owing to install above-mentioned relief valve, can avoid excessively compressing to deformation inefficacy with the elastic component in the relief valve when the pressure release to extension relief valve life effectively reduces the number of times of maintenance change relief valve, reduce cost, convenient to use.

It can be understood that, although the grease gun is taken as an example in the embodiment for description, the safety valve provided by the present invention may also be applied to other pressure-bearing tools with pressure relief requirements, such as boilers or pressure vessels, etc., although the above-mentioned equipment has a large volume, the pressure spring in the safety valve can be completely made to bear a large working limit load, but the requirement on the manufacturing process of the pressure spring is high, which results in high production cost of the safety valve, and the safety valve provided by the present invention can correspondingly reduce the process parameters of the pressure spring, and realize pressure balance on both sides of the ejector rod during pressure relief by means of the abutting action of the ejector rod and the inner bottom surface of the end cover, so that the cost of the safety valve can be effectively reduced, and meanwhile, safety and durability can be ensured.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.

Claims (8)

1. The utility model provides a safety valve, includes valve body (1), end cover (2), ejector pin (3) and elastic component (4), valve body (1) is connected with end cover (2) and is formed the cavity that is used for setting up ejector pin (3), and during the pressure release the elasticity that elastic component (4) were overcome in ejector pin (3) removes its characterized in that in the cavity: when the pressure is released, the ejector rod (3) moves to abut against the inner surface of the end cover (2) before the elastic deformation of the elastic piece (4) reaches the limit;

the pressure relief type water tap is characterized in that the valve body (1) is provided with a pressure relief inflow hole (10) and a pressure relief outflow hole (11), the front end of the ejector rod (3) tightly supports and seals the pressure relief inflow hole (10), and the ejector rod (3) moves to enable the pressure relief inflow hole (10) to be communicated with the pressure relief outflow hole (11) during pressure relief;

the front end of the ejector rod (3) is provided with an annular boss (31), the front end of the annular boss (31) is provided with a conical inclined plane, and the annular boss (31) is further provided with a pressure relief groove (32).

2. A safety valve as claimed in claim 1, wherein: elastic component (4) are the pressure spring, elastic component (4) cover is established on ejector pin (3), elastic component (4) one end and end cover (2) internal surface butt, elastic component (4) other end and ejector pin (3) front end butt.

3. A safety valve as claimed in claim 2, wherein: the end cover (2) is provided with an annular step (20), one end of the elastic piece (4) is abutted to the end face of the annular step (20), and the rear end of the ejector rod (3) extends into a limiting groove (200) formed by the annular step (20).

4. A safety valve as claimed in claim 1, wherein: the end cover (2) and the valve body (1) are integrally formed.

5. A safety valve as claimed in claim 1, wherein: the end cover (2) is in threaded connection with the valve body (1).

6. A safety valve as claimed in claim 5, wherein: be equipped with threaded rod (21) on end cover (2), set up the internal thread with threaded rod (21) looks adaptation in valve body (1), the cover is equipped with gasket (22) on threaded rod (21) replaceably, gasket (22) are used for adjusting threaded rod (21) and stretch into the length of inner chamber.

7. A safety valve as claimed in claim 1, wherein: the front end of the ejector rod (3) is provided with a hemispherical groove (30), a steel ball (5) is arranged in the hemispherical groove (30), the wall of the pressure relief inflow hole (10) is provided with an annular groove matched with the surface of the steel ball (5), and the ejector rod (3) tightly presses and seals the steel ball (5) in the annular groove.

8. A grease gun, its characterized in that: a safety valve comprising a valve as claimed in any one of claims 1 to 7.

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