CN209743622U - Piston for safety valve - Google Patents

Abstract

The utility model provides a piston for relief valve belongs to relief valve technical field, include: the plug comprises a plug body, a fixing screw and a ferrule, wherein a pin shaft hole is formed in the plug body, an annular mounting groove is formed in the outer wall of the plug body, a plurality of screw holes are formed in the mounting groove, the ferrule is composed of a plurality of annular pieces, a smooth layer is arranged on the outer surface of each annular piece, each annular piece is arranged in the mounting groove, and the fixing screw penetrates through each annular piece and is connected with the screw holes. The utility model has the advantages that: the production difficulty is low, the surface smoothness is high, and the valve body inner wall can be kept in sealing connection.

Description

Piston for safety valve

Technical Field

The utility model belongs to the technical field of the relief valve, a piston for relief valve is related to.

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 safety valve belongs to the automatic valve class, mainly used on boiler, pressure vessel and pipeline, and the control pressure does not exceed the specified value, plays important protection to personal safety and equipment operation, and the piston is a part in the safety valve, for example chinese patent of an application number 201720761169.8, discloses a safety valve, includes: the valve body comprises two detachably connected shells, namely a first shell and a second shell, and a first through groove and a second through groove are formed in the axial direction of the first shell and the axial direction of the second shell respectively and are arranged in a step shape; an annular groove is formed in the outer side wall of the second shell along the axial direction of the second shell, and an annular sealing ring is embedded in the annular groove; the piston is embedded in a connecting part of the first shell and the second shell; one end of the pin is connected with the piston, the other end of the pin abuts against the groove wall of the stepped second through groove, the spring is located between the piston and the pin, one end of the spring is nested on the piston, and the other end of the spring abuts against the pin.

It can be seen from the above safety valve that the piston is provided inside, and the piston is different from the piston for the cylinder, and is a piston specially applied to the safety valve, while the existing piston applied to the safety valve needs to be kept in sealing connection with the inner wall of the valve body, so that the requirement on the smoothness of the outer wall is high, which results in a high difficulty in production and manufacture, and therefore, a piston which is low in production difficulty, high in surface smoothness and capable of being kept in sealing connection with the inner wall of the valve body is needed at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a piston for relief valve.

The purpose of the utility model can be realized by the following technical proposal: a piston for a safety valve comprising: the plug comprises a plug body, a fixing screw and a ferrule, wherein a pin shaft hole is formed in the plug body, an annular mounting groove is formed in the outer wall of the plug body, a plurality of screw holes are formed in the mounting groove, the ferrule is composed of a plurality of annular pieces, a smooth layer is arranged on the outer surface of each annular piece, each annular piece is arranged in the mounting groove, and the fixing screw penetrates through each annular piece and is connected with the screw holes.

Preferably, the number of the annular sheets is at least two, the plug body is provided with assembling screws, the two sides of each annular sheet are provided with notch parts of a semicircular stepped hole structure, and the heads of the assembling screws abut against the notch parts of the adjacent two annular sheets, so that the annular sheets are assembled into an annular structure.

Preferably, the inner wall of the plug body is provided with an annular groove wall positioned at the end part of the pin shaft hole, and the inner annular surface of the annular groove wall is an arc-shaped surface.

preferably, the annular groove wall is provided with a through hole, and the through hole is communicated with the pin shaft hole.

Preferably, the plug body is provided with an annular boss, and the outer diameter of the annular boss is smaller than that of the plug body.

Preferably, an annular groove is formed in the outer wall of the plug body, and a sealing ring is arranged in the annular groove.

Preferably, the annular sheet is provided with a counter bore, and the head of the fixing screw is located in the counter bore.

Compared with the prior art, the beneficial effects of the utility model are that:

1. The production difficulty is low, the surface smoothness is high, and the valve body inner wall can be kept in sealing connection.

Drawings

Fig. 1 is a schematic structural diagram of the piston of the present invention.

Fig. 2 is a schematic structural diagram of the ferrule of the present invention.

Fig. 3 is a schematic diagram of the position relationship between the safety valve and the piston according to the present invention.

In the figure, 100, the plug body; 110. a pin shaft hole; 120. mounting grooves; 130. a screw hole; 140. an annular groove wall; 150. an arc-shaped surface; 160. a through hole; 170. an annular boss; 180. an annular groove; 190. a seal ring; 200. a set screw; 300. assembling screws; 400. a ferrule; 410. an annular sheet; 420. a notch portion; 430. a counterbore.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, and 3, a piston for a safety valve includes: the plug comprises a plug body 100, a fixing screw 200 and a ferrule 400, wherein a pin shaft hole 110 is arranged in the plug body 100, an annular mounting groove 120 is arranged on the outer wall of the plug body 100, a plurality of screw holes 130 are arranged on the mounting groove 120, the ferrule 400 is composed of a plurality of annular sheets 410, a smooth layer is arranged on the outer surface of each annular sheet 410, each annular sheet 410 is arranged in the mounting groove 120, and the fixing screw 200 penetrates through each annular sheet 410 and is connected with each screw hole 130.

It should be pointed out here that the piston is not a piston applied to the cylinder, but a piston applied to the safety valve, the piston does not move in the safety valve, in the actual structure, the piston and the pin shaft are installed in the safety valve, the pin shaft is installed in the piston in a penetrating manner, and a spring is arranged between the piston and the pin shaft, the pin shaft moves in the piston along the axial direction, the outer surface of the piston needs to have high smoothness, a tight fitting structure is formed between the piston and the inner wall of the installed valve, and in the actual processing process, the outer surface of the piston is processed, which is very troublesome and time-consuming and labor-consuming, resulting in poor assembling effect of the piston and the safety valve shell.

Preferably, in order to realize the smoothness requirement of the outer surface of the plug body 100, the outer surface of the whole plug body 100 does not need to be treated, an annular mounting groove 120 can be firstly formed in the surface of the plug body 100 with low smoothness, then the ferrule 400 is assembled in the mounting groove 120, the outer diameter of the ferrule 400 is slightly larger than that of the plug body 100, the surface smoothness of the ferrule 400 is very high, the ferrule 400 is composed of a plurality of annular sheets 410, the annular sheets 410 are fixed on the plug body 100 through fixing screws 200, in the actual size, the outer diameter of the plug body 100 can be in clearance fit with a safety valve outer shell, and the ferrule 400 can be in interference fit with the safety valve outer shell, so that the processing difficulty can be reduced, the installation difficulty of the plug body 100 can be facilitated, and the plug body 100 is more convenient to assemble into the safety valve.

As shown in fig. 1 and 2, in addition to the above embodiment, the number of the ring-shaped pieces 410 is at least two, the plug body 100 is provided with the assembling screws 300, and both sides of the ring-shaped pieces 410 are provided with the notch parts 420 having a semicircular stepped hole structure, and the heads of the assembling screws 300 are abutted against the notch parts 420 of the two adjacent ring-shaped pieces 410, so that the ring-shaped pieces 410 are assembled into a ring-shaped structure.

Preferably, the number of the ring-shaped pieces 410 may be two, or may be more than two, here, preferably two, the two ring-shaped pieces 410 are semicircular, and not only are the two ring-shaped pieces 410 fixedly connected to the plug body 100 by the fixing screws 200, but also two ends of the ring-shaped pieces 410 need to be fixed in order to prevent the edge of the ring-shaped pieces 410 from tilting and damaging the shape of the ferrule 400, and two ends of the ring-shaped pieces 410 actually have semicircular notch portions 420, and the wall surfaces of the notch portions 420 are stepped or slope-shaped, so that the head of the assembling screw 300 can press the notch portions 420, and the edges of the two necklace ring-shaped pieces 410 are pressed in the mounting groove 120, so that the ring-shaped pieces 410 maintain the shape of the ferrule 400, and the installation of the whole ring-shaped piece 410 only needs two fixing screws 200 and two assembling screws 300 to form the ferrule 400 to be fixed on the.

As shown in fig. 1 and 2, in addition to the above embodiment, an annular groove wall 140 is provided on an inner wall of the plug body 100 at an end of the pin shaft hole 110, and an inner annular surface of the annular groove wall 140 is an arc surface 150.

Preferably, the inner wall of the plug body 100 is provided with an annular groove wall 140, and the annular groove wall 140 corresponds to the end of the pin shaft, so that the pin shaft and the piston can be positioned more easily during operation, specifically, the pin shaft can move in the pin shaft hole 110 in the piston, and when the pin shaft moves, the pin shaft can abut against the annular groove wall 140, and if the end of the pin shaft is not aligned with the annular groove 180, the end of the pin shaft is easily damaged, and when the inner ring of the annular groove wall 140 is set to the convex arc-shaped surface 150, the inner ring can just form point contact with the end of the pin shaft, so that the positioning between the pin shaft and the piston is simpler and more accurate.

As shown in fig. 1, 2 and 3, in the above embodiment, a through hole 160 is formed in the annular groove wall 140, the through hole 160 is communicated with the pin shaft hole 110, and preferably, the through hole 160 can be used for pressure relief.

As shown in fig. 1 and 2, in addition to the above embodiments, the plug body 100 is provided with an annular boss 170, and the outer diameter of the annular boss 170 is smaller than the outer diameter of the plug body 100.

Preferably, the annular boss 170 is actually a structure formed at the end of the plug body 100 extending axially, and the spring can be sleeved on the annular boss 170, so as to achieve the effect of fixing the spring.

As shown in fig. 1 and 2, in addition to the above embodiments, an annular groove 180 is provided on the outer wall of the plug body 100, and a sealing ring 190 is provided in the annular groove 180.

Preferably, a packing 190 may be installed on an outer wall of the plug body 100 so that a sealing state is maintained between the plug body 100 and an inner wall of the safety valve housing.

As shown in fig. 1 and 2, on the basis of the above embodiment, a counterbore 430 is provided on the annular plate 410, and the head of the fixing screw 200 is located in the counterbore 430.

Preferably, the counter bore 430 is provided to hide the head of the fixing screw 200 in the counter bore 430, so that the head of the fixing screw 200 can be prevented from protruding out of the surface of the annular plate 410, and the fitting effect between the annular plate 410 and the inner wall of the safety valve can not be affected.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (7)

1. A piston for a safety valve, comprising: the plug comprises a plug body, a fixing screw and a ferrule, wherein a pin shaft hole is formed in the plug body, an annular mounting groove is formed in the outer wall of the plug body, a plurality of screw holes are formed in the mounting groove, the ferrule is composed of a plurality of annular pieces, a smooth layer is arranged on the outer surface of each annular piece, each annular piece is arranged in the mounting groove, and the fixing screw penetrates through each annular piece and is connected with the screw holes.

2. The piston for a safety valve as claimed in claim 1, wherein: the annular piece's quantity is two at least, be provided with on the cock body and assemble the screw, and be provided with the breach portion of semi-circular stepped hole structure on the both sides of annular piece, the head of assembling the screw is contradicted adjacent two in the breach portion of annular piece, thereby make a plurality of the annular piece pieces piece into the ring shaped structure.

3. The piston for a safety valve as claimed in claim 1, wherein: the inner wall of the plug body is provided with an annular groove wall positioned at the end part of the pin shaft hole, and the inner annular surface of the annular groove wall is an arc-shaped surface.

4. The piston for a safety valve as claimed in claim 3, wherein: and a through hole is formed in the annular groove wall and is communicated with the pin shaft hole.

5. The piston for a safety valve as claimed in claim 1, wherein: the plug body is provided with an annular boss, and the outer diameter of the annular boss is smaller than that of the plug body.

6. The piston for a safety valve as claimed in claim 1, wherein: an annular groove is formed in the outer wall of the plug body, and a sealing ring is arranged in the annular groove.

7. The piston for a safety valve as claimed in claim 2, wherein: the annular sheet is provided with a counter bore, and the head of the fixing screw is positioned in the counter bore.