CN210372178U

CN210372178U - Valve core suitable for pressure release valve

Info

Publication number: CN210372178U
Application number: CN201921081117.1U
Authority: CN
Inventors: 郭庆; 凃士雄; 凃志兴
Original assignee: Jpe Yean Hern Co ltd
Current assignee: Jpe Yean Hern Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-04-21
Anticipated expiration: 2029-07-11
Also published as: TWM605258U

Abstract

The utility model relates to a case suitable for relief valve, it includes core body, push rod, top and leans on piece, regulation plug screw and column spring, wherein, is provided with pressure release chamber, push rod in the inside of core body and holds chamber and discharge orifice. An internal thread matched with the adjusting screw plug is arranged on the side wall of the upper part of the accommodating cavity. The abutting piece is arranged right below the adjusting screw plug, and an insertion hole used for being sleeved on the push rod is formed in the lower end portion of the abutting piece. The lower part of the push rod is provided with a spring abutting flange. The columnar spring is sleeved on the push rod, the lower end part of the columnar spring is always propped against the spring propping flange, and the upper end part of the columnar spring is always propped against the propping piece. The push rod elastically leans against the right above the discharge hole under the action of the abutting force of the columnar spring so as to realize the isolation of the accommodating cavity of the push rod and the pressure discharge cavity. Therefore, the adjustment of the telescopic length of the columnar spring can be realized by rotating the adjusting screw plug, so that the opening pressure value of the valve core is changed, and the aim of adjusting the pressure value of fluid in the pipeline is fulfilled.

Description

Valve core suitable for pressure release valve

Technical Field

The utility model relates to a valve manufacturing technical field especially relates to a case suitable for relief valve.

Background

In the actual construction process, the pressure value of the fluid in the pipeline needs to be adjusted and controlled by means of the pressure relief valve. Generally, the opening/closing of the valve element is achieved by the interaction of the elastic force of a cylindrical spring inside the core body and the pressure of the fluid in the pipe. However, in the related art, the cylindrical spring is normally pressed by means of the gland (as shown in fig. 1), and it is inconvenient to adjust the magnitude of the elastic force. If the magnitude of the elastic force needs to be adjusted, the gland needs to be dismantled, and springs with different rigidity coefficients need to be replaced, so that the operation is very complicated and inconvenient. Thus, a skilled person is urgently needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a structural design is simple, and the pressure release value adjustment is convenient, swift, and has the case that is applicable to the relief valve of higher sensitivity.

In order to solve the technical problem, the utility model relates to a case suitable for relief valve, it includes core body, push rod, pushes up by the piece, adjusts plug screw and column spring, wherein, is provided with pressure release chamber, push rod in the inside of core body and holds chamber and discharge orifice. The pressure relief cavity is communicated with the push rod accommodating cavity through a pressure relief hole. An internal thread matched with the adjusting screw plug is arranged on the side wall of the upper part of the push rod accommodating cavity. The abutting piece is arranged right below the adjusting screw plug, and an insertion hole used for being sleeved on the push rod is formed in the lower end portion of the abutting piece. The lower part of the push rod is provided with a spring abutting flange. The columnar spring is sleeved on the push rod, the lower end part of the columnar spring is always propped against the spring propping flange, and the upper end part of the columnar spring is always propped against the propping piece. The push rod elastically leans against the right above the discharge hole under the action of the abutting force of the columnar spring so as to realize the isolation of the accommodating cavity of the push rod and the pressure discharge cavity.

As a further improvement of the technical scheme, the tail end of the push rod is provided with a taper with a large upper part and a small lower part, and correspondingly, the bottom of the push rod accommodating cavity matched with the tail end of the push rod is also provided with a taper.

As a further improvement of the above technical solution, the valve core adapted to the pressure relief valve further includes a sealing ring, and correspondingly, an annular mounting groove for accommodating the push rod is formed in a side wall of a distal end of the push rod.

As a further improvement of the technical scheme, the push rod is in clearance fit with the insertion hole, and the unilateral clearance value is controlled to be 0.2-0.3 mm.

As a further improvement of the technical scheme, a wear-resistant coating is arranged on the outer side wall of the push rod and in the area matched with the insertion hole.

As a further improvement of the technical scheme, an annular graphite groove is formed in the upper plane of the abutting piece and the area abutting against the adjusting screw plug and used for embedding graphite.

As a further improvement of the technical proposal, the internal thread is a trapezoidal thread, and the thread form angle is 30 degrees.

Compare in the case of traditional project organization the utility model discloses an among the technical scheme, adjust the plug screw through the rotating and can realize the adjustment to the flexible length of column spring to changed its size that acts on the discharge orifice sealing force (case opening pressure promptly), reached the purpose of adjusting to fluid pressure value in the pipeline with convenient, swiftly.

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 these drawings without creative efforts.

Fig. 1 is a schematic diagram of a prior art valve spool suitable for a pressure relief valve.

Fig. 2 is a schematic structural diagram of a first embodiment of the valve element applicable to the pressure relief valve in the present invention.

Fig. 3 is a schematic structural diagram of a second embodiment of the valve element applicable to the pressure relief valve in the present invention.

1-a core body; 11-a pressure relief cavity; 12-a pushrod receiving chamber; 13-a drain hole; 2-a push rod; 21-spring against flange; 3-a leaning piece; 31-an insertion hole; 32-a drainage channel 32; 4-adjusting the screw plug; 5-a cylindrical spring; 6-sealing ring; 7-graphite.

Detailed Description

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The technical solution disclosed in the present invention is explained below with reference to an example, and fig. 2 shows a schematic structural diagram of a first embodiment of a valve element for a pressure relief valve in the present invention, which is mainly composed of a core body 1, a push rod 2, a top leaning piece 3, an adjusting plug screw 4, a cylindrical spring 5, and the like, wherein a pressure relief cavity 11, a push rod accommodating cavity 12, and a pressure relief hole 13 are provided in the core body 1. The pressure relief chamber 11 communicates with the rod accommodating chamber 12 through a vent hole 13. In addition, at least one drainage groove 32 is formed on the peripheral side wall of the abutting member 3 to facilitate the overflow of the fluid. The upper side wall of the push rod accommodating cavity 12 is provided with an internal thread matched with the adjusting screw plug 4. The abutting piece 3 is arranged right below the adjusting screw plug 4, and an insertion hole 31 for sleeving the push rod 2 is formed at the lower end part of the abutting piece. A spring abutting flange 21 is provided at the lower portion of the push rod 2. The columnar spring 5 is sleeved on the push rod 2, the lower end part of the columnar spring always abuts against the spring abutting flange 21, and the upper end part of the columnar spring always abuts against the abutting piece 3. The push rod 2 elastically leans against the right upper part of the discharge hole 13 under the action of the leaning force of the cylindrical spring 5 so as to realize the isolation of the push rod accommodating cavity 12 and the pressure discharge cavity 11. Therefore, the adjustment of the telescopic length of the cylindrical spring 5 can be conveniently realized by rotating the adjusting screw plug 4, so that the elastic force of the cylindrical spring is changed, the sealing force (namely the valve core opening pressure) acting on the drainage hole 13 is changed, and the aim of adjusting the pressure value of the fluid in the pipeline is conveniently and quickly achieved.

In view of reliable sealing of the push rod 2 to the drain hole 13, as a further optimization of the valve core suitable for the pressure relief valve, the end of the push rod 2 is tapered with a large top and a small bottom, and correspondingly, the bottom of the push rod accommodating cavity 12 adapted to the end is also tapered (as shown in fig. 2), so that, on one hand, the fitting precision of the push rod 2 relative to the side wall of the push rod accommodating cavity 12 is effectively ensured, and the push rod accommodating cavity 12 is effectively isolated from the pressure relief cavity 11; on the other hand, when the push rod 2 is worn relative to the side wall of the push rod accommodating cavity 12, the conical matching mode can perform self-compensation in real time, and leakage is prevented.

Fig. 3 shows a schematic structural diagram of a second embodiment of the valve element applicable to the pressure relief valve in the present invention, which is different from the first embodiment in that: offer the annular mounting groove that is used for holding it on the terminal lateral wall of push rod 2 to cooperation installation sealing washer 6 has further prevented that push rod 2 from holding the emergence of the 12 leakage phenomena in chamber for the push rod.

It should be noted that, the gap between the push rod 2 and the insertion hole 31 is particularly important, and when the gap between the push rod 2 and the insertion hole 31 is relatively large, the movement precision of the push rod 2 is inevitably affected, and an oblique phenomenon occurs, so that the abrasion between the push rod and the side wall of the push rod accommodating cavity 12 is aggravated; when the clearance is small, the movement resistance of the push rod 2 is increased, and the difficulty of displacement is increased. Generally, the push rod 2 and the insertion hole 31 are arranged to be in clearance fit, and the value of the single-side clearance is generally controlled to be between 0.2 and 0.3 mm.

In view of reducing the friction coefficient and the displacement smoothness of the push rod 2 relative to the insertion hole 31, a wear-resistant coating (not shown in the figure) can be arranged on the outer side wall of the push rod 2 and the area matched with the insertion hole 31, so that the wear rates of the push rod 2 and the insertion hole 31 are greatly increased, and the service life of the push rod is prolonged.

Known, in the concrete pressure regulating process, there is great frictional force for leaning on piece 3 in the regulation plug screw 4 to increased the degree of difficulty of rotating regulation plug screw 4, can make the cylindrical spring 5 take place the phenomenon of turning round even, influence the regulation precision of pressure relief valve. In addition, the existence of the friction force can cause abrasion to the matching surfaces of the adjusting screw plug 4 and the abutting piece 3, thereby affecting the matching precision of the adjusting screw plug and the abutting piece. For this purpose, an annular graphite groove may be provided in the upper plane of the abutting member 3 in the region abutting against the adjusting screw plug 4, for embedding the graphite 7 (as shown in fig. 3). The graphite has excellent self-lubricating property, can effectively reduce the abrasion rate of the matching surface of the adjusting screw plug 4 and the abutting part 3, and more importantly, ensures the smooth progress of the process of rotating the adjusting screw plug 4.

Finally, the internal thread provided in the plunger accommodating chamber 12 is preferably a trapezoidal thread having a profile angle of 30 °. As known, the trapezoidal thread has high use strength and self-locking property, so that the stability of the relative position of the push rod 2 relative to the push rod accommodating cavity 12 is effectively ensured, and the fluid pressure in the pipeline is further ensured to be constant within a certain time.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A valve core suitable for a pressure relief valve is characterized by comprising a core body, a push rod, a propping piece, an adjusting screw plug and a columnar spring, wherein a pressure relief cavity, a push rod accommodating cavity and a pressure relief hole are formed in the core body; the pressure relief cavity is communicated with the push rod accommodating cavity through the vent hole; an internal thread matched with the adjusting screw plug is formed on the side wall of the upper part of the push rod accommodating cavity; the abutting piece is arranged right below the adjusting screw plug, and an insertion hole for sleeving the push rod is formed in the lower end part of the abutting piece; a spring abutting flange is arranged at the lower part of the push rod; the columnar spring is sleeved on the push rod, the lower end part of the columnar spring is always propped against the spring propping flange, and the upper end part of the columnar spring is always propped against the propping piece; the push rod is in the effect of cylindrical spring top leaning on down the elasticity top lean on in discharge orifice to the realization the push rod hold the chamber with the isolated of decompression chamber.

2. The valve core suitable for the pressure relief valve according to claim 1, wherein the end of the push rod is tapered with a large top and a small bottom, and correspondingly, the bottom of the push rod accommodating cavity matched with the end of the push rod is also tapered.

3. The valve core suitable for the pressure relief valve according to claim 2, further comprising a sealing ring, and correspondingly, an annular mounting groove for accommodating the push rod is formed in the side wall of the tail end of the push rod.

4. The valve core applicable to the pressure relief valve according to any one of claims 1 to 3, wherein the push rod is in clearance fit with the plug hole, and the single-side clearance value is controlled to be 0.2-0.3 mm.

5. The valve core suitable for the pressure relief valve according to claim 4, wherein a wear-resistant coating is arranged on the outer side wall of the push rod and in a region matched with the plug hole.

6. The valve core suitable for the pressure relief valve according to claim 1, wherein an annular graphite groove is formed in an area, abutting against the adjusting screw plug, of the upper plane of the abutting member, and is used for embedding graphite.

7. The valve spool suitable for use in a pressure relief valve according to claim 1 wherein the internal threads are trapezoidal threads having a profile angle of 30 °.