CN217951337U

CN217951337U - Double-safety valve

Info

Publication number: CN217951337U
Application number: CN202220595502.3U
Authority: CN
Inventors: 石卫民; 欧阳志强; 谭颖; 卢春阳; 田爱民
Original assignee: Hengyang Zhongdi Equipment Prospecting Engineering Machinery Co ltd
Current assignee: Hengyang Zhongdi Equipment Prospecting Engineering Machinery Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-12-02
Anticipated expiration: 2032-03-18

Abstract

The utility model discloses a double-insurance type safety valve, which comprises a piston type safety valve, wherein the piston type safety valve comprises a valve body and a first pressure relief pipe, a first channel and a second channel are arranged in the valve body, and the first channel is respectively communicated with the second channel and the first pressure relief pipe; the valve body is further provided with a second pressure relief pipe communicated with the second channel, a safety diaphragm is arranged in the second pressure relief pipe, and the bursting pressure of the safety diaphragm is greater than the opening pressure of the first pressure relief pipe. Owing to adopted above-mentioned technical scheme, compare with prior art, the utility model discloses both solved the potential safety hazard that piston relief valve probably can not normally open, reduced the number of times of rupture disk blasting formula relief valve dismouting rupture disk simultaneously again by a wide margin.

Description

Double-safety valve

Technical Field

The utility model relates to a slush pump mechanical equipment technical field, concretely relates to dual fail-safe formula relief valve.

Background

In the existing slurry pump industry, the working pressure of a pump is different from a few tenths of megapascals to dozens of megapascals, when the slurry pump works, if the output pressure exceeds the rated pressure and reaches a certain limit value, the slurry pump or accessories thereof can be damaged, and workers can be injured when the output pressure is serious. Therefore, each mud pump has a safety device. The following two structures are commonly used as safety devices for slurry pumps:

1. a pressure-adjustable piston relief valve as shown in fig. 1 and 2. The outlet end of the pressure-adjustable piston type safety valve is connected with an output pipe (not shown in the figure), when the output pipe is blocked, the pressure of slurry in the output pipe and the valve body 1 is gradually increased, when the pressure is increased to the rated pressure of the slurry pump, the upward thrust formed by the pressure on the piston 12 is enough, the thrust pushes the valve rod 13 to move upwards, the channel of the pressure release pipe 14 is opened, and the slurry with the pressure is discharged from the channel of the pressure release pipe 14, so that the equipment safety of the slurry pump and related auxiliary parts and the personal safety of workers are ensured. The disadvantages of this safety valve are: when the slurry pump is idle for a long time, parts in the safety valve are likely to be corroded, or the sensitivity of the spring is reduced, when the slurry pump is operated, rated pressure is likely to be reached, and the safety valve cannot be normally opened; in addition, when the mud pump is in a normal working condition for a long time, namely the pressure adjustable piston type safety valve is not opened for a long time, and internal parts are always in a vibration state, the contact positions of the parts and the parts are likely to be slightly abraded, so that the safety valve is likely not to be normally opened even under the rated pressure.

2. A safety diaphragm burst safety valve as shown in fig. 3 and 4. The outlet end of the safety diaphragm explosion type safety valve is connected with an output pipe (not shown in the figure), when the output pipe is blocked, the pressure of the whole output pipe and the slurry in the valve body 1 is gradually increased, when the pressure is increased to the rated pressure of the slurry pump, the safety diaphragm 202 is exploded, and the slurry with the pressure is discharged from a channel of the pressure relief pipe 203, so that the equipment safety of the slurry pump and related accessories and the personal safety of workers are ensured. The disadvantages of this safety valve are: the safety diaphragm must be installed again every time the safety diaphragm explodes once, and the assembly and disassembly are relatively complicated.

SUMMERY OF THE UTILITY MODEL

For solving the above-mentioned problem that current relief valve exists among the background art, the utility model provides a double insurance formula relief valve, concrete technical scheme is as follows.

A double-insurance type safety valve comprises a piston type safety valve, wherein the piston type safety valve comprises a valve body and a first pressure relief pipe, a first channel and a second channel are arranged in the valve body, and the first channel is respectively communicated with the second channel and the first pressure relief pipe; the valve body is further provided with a second pressure relief pipe communicated with the second channel, a safety diaphragm is arranged in the second pressure relief pipe, and the bursting pressure of the safety diaphragm is greater than the opening pressure of the first pressure relief pipe.

Through above-mentioned structure, break down when the piston relief valve, when having arrived rated pressure and can not normally open, the pressure of mud can continue to rise in valve body and the delivery pipe, has arrived the burst pressure of safety diaphragm very fast just, and the safety diaphragm explodes, and mud releases the pressure smoothly. Under the general condition, the possibility of failure of the piston type safety valve is not high, the safety valve is convenient to reset after being opened, and when the piston type safety valve fails occasionally, the safety diaphragm is exploded, so that the safety is guaranteed.

Preferably, a piston is arranged in the first channel, and the piston opens the first pressure relief pipe when ascending and blocks the first pressure relief pipe when falling.

Preferably, a valve rod and a first spring are further arranged in the first channel, the lower end of the valve rod is connected with the piston, the upper end of the valve rod is connected with one end of the first spring, and the other end of the first spring is abutted to the top of the valve body.

Preferably, the first channel is arranged vertically and the second channel is arranged horizontally; the lower end of the first channel is communicated with the upper portion of the second channel, the lower portion of the first channel is communicated with the first pressure relief pipe, and the lower portion of the second channel is communicated with the second pressure relief pipe.

Preferably, the valve body is further provided with a pressure adjusting mechanism for adjusting the opening pressure of the first pressure relief pipe.

Preferably, the pressure adjusting mechanism comprises a mounting cover, a steel ball, a second spring and an adjusting screw, wherein the steel ball, the second spring and the adjusting screw are arranged in the mounting cover; a mounting hole communicated with the first channel is formed in the side wall of the valve body, one end of the mounting cover is detachably mounted on the mounting hole, and the other end of the mounting cover is in threaded connection with the adjusting screw; the valve rod is provided with a trapezoidal groove, one end of the steel ball is embedded in the trapezoidal groove, the other end of the steel ball is connected with one end of the second spring, and the other end of the second spring is abutted to the adjusting screw.

Preferably, the bursting pressure of the safety diaphragm is P1, and the opening pressure of the first pressure relief pipe is P2; p2 is more than P1 and less than or equal to 1.05P2.

Owing to adopted above technical scheme, compare with prior art, the utility model discloses an above-mentioned structure, when piston relief valve broke down, when first pressure release pipe had arrived rated pressure and can not normally open, the pressure of mud in valve body and the output tube can continue to rise, has arrived safety diaphragm's the pressure of bursting open very fast, and safety diaphragm bursts open, and mud pressure release smoothly. Under the general condition, the possibility that piston relief valve is malfunctioning is not big, and the relief valve resets after being opened conveniently, and when piston relief valve is malfunctioning occasionally, the safety diaphragm bursts, makes safety be ensured. The utility model discloses both solved the potential safety hazard that piston relief valve probably can not normally open, reduced the number of times of rupture disk blasting formula relief valve dismouting rupture disk simultaneously again by a wide margin.

Drawings

FIG. 1 is a schematic structural diagram of a conventional pressure-adjustable piston-type safety valve in a normal state;

FIG. 2 is a schematic structural diagram of a conventional pressure-adjustable piston-type safety valve in an open state;

FIG. 3 is a schematic structural diagram of a conventional safety diaphragm explosion type safety valve in a normal state;

fig. 4 is a schematic structural view of a safety diaphragm of a conventional safety diaphragm explosion type safety valve in an explosion state;

fig. 5 is a schematic structural view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 5, a double safety type safety valve includes a piston type safety valve including a valve body 1 and a first pressure relief pipe 3. A first channel 101 is vertically arranged in the valve body 1, a second channel 102 is transversely arranged, the lower end of the first channel 101 is communicated with the upper portion of the second channel 102, the lower portion of the first channel 101 is communicated with the first pressure relief pipe 3, a second pressure relief pipe 201 communicated with the second channel 102 is further arranged at the lower portion of the second channel 102, a safety diaphragm 202 is arranged in the second pressure relief pipe 201, and the bursting pressure of the safety diaphragm 202 is larger than the opening pressure of the first pressure relief pipe 3.

A first spring 103, a valve rod 104 and a piston 105 are sequentially arranged in the first channel 101 from top to bottom. The lower end of the valve rod 104 is connected with the piston 105, the upper end of the valve rod 104 is connected with one end of the first spring 103, and the other end of the first spring 103 is abutted against the top of the valve body 1. The piston 103 opens the first pressure relief pipe 3 when rising and blocks the first pressure relief pipe 3 when falling.

The valve body 1 is further provided with a pressure adjusting mechanism for adjusting the opening pressure of the first pressure relief pipe 3, and the pressure adjusting mechanism comprises an installation cover 401, and a steel ball 402, a second spring 403 and an adjusting screw 404 which are arranged in the installation cover 401. The side wall of the valve body 1 is provided with a mounting hole communicated with the first channel 101, one end of the mounting cover 401 is detachably mounted on the mounting hole, and the other end of the mounting cover is in threaded connection with the adjusting screw 404. The valve rod 104 is provided with a trapezoidal groove 106, one end of the steel ball 402 is embedded in the trapezoidal groove 106, the other end of the steel ball is connected with one end of the second spring 403, and the other end of the second spring 403 is abutted to the adjusting screw 404.

Typically, the opening pressure of the first pressure relief tube 3 is in the range of 6 to 18 mpa. In this embodiment, the opening pressure of the first pressure relief pipe 3 is 12 mpa, and the bursting pressure of the safety diaphragm 202 is 12.5 mpa, which is slightly higher than the opening pressure of the first pressure relief pipe 3.

In operation, the outlet of the first channel 101 is connected to the output pipe. When the piston type safety valve breaks down, the first pressure relief pipe 3 cannot be normally opened when reaching the rated pressure, the pressure of slurry in the valve body 1 and the output pipe can be continuously increased, the bursting pressure of the safety diaphragm 202 is quickly reached, the safety diaphragm 202 bursts, and the slurry is smoothly decompressed. Under normal conditions, the possibility of failure of the piston type safety valve is not high, the first pressure relief pipe 3 is convenient to reset after being opened, and when the piston type safety valve fails occasionally, the safety diaphragm 202 is exploded, so that the safety is guaranteed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-insurance type safety valve comprises a piston type safety valve, wherein the piston type safety valve comprises a valve body and a first pressure relief pipe; a first channel and a second channel are arranged in the valve body, and the first channel is respectively communicated with the second channel and the first pressure relief pipe; the method is characterized in that: the valve body is further provided with a second pressure relief pipe communicated with the second channel, a safety diaphragm is arranged in the second pressure relief pipe, and the bursting pressure of the safety diaphragm is greater than the opening pressure of the first pressure relief pipe.

2. A safety valve according to claim 1, wherein: and a piston is arranged in the first channel, and the piston opens the first pressure relief pipe when ascending and blocks the first pressure relief pipe when falling.

3. A double safety valve according to claim 1 or 2, wherein: still be equipped with valve rod and first spring in the first passageway, the lower extreme of valve rod with piston connection, the upper end of valve rod with the one end of first spring is connected, the other end of first spring with the top butt of valve body.

4. A double safety valve according to claim 1 or 2, wherein: the first channel is vertically arranged, and the second channel is transversely arranged; the lower end of the first channel is communicated with the upper part of the second channel, the lower part of the first channel is communicated with the first pressure relief pipe, and the lower part of the second channel is communicated with the second pressure relief pipe.

5. A safety valve according to claim 3, wherein: and the valve body is also provided with a pressure adjusting mechanism for adjusting the opening pressure of the first pressure relief pipe.

6. The double safety valve according to claim 5, wherein: the pressure adjusting mechanism comprises a mounting cover, a steel ball, a second spring and an adjusting screw, wherein the steel ball, the second spring and the adjusting screw are arranged in the mounting cover; a mounting hole communicated with the first channel is formed in the side wall of the valve body, one end of the mounting cover is detachably mounted on the mounting hole, and the other end of the mounting cover is in threaded connection with the adjusting screw; the valve rod is provided with a trapezoidal groove, one end of the steel ball is embedded in the trapezoidal groove, the other end of the steel ball is connected with one end of the second spring, and the other end of the second spring is abutted to the adjusting screw.

7. A double safety valve according to claim 1 or 2, wherein: the bursting pressure of the safety diaphragm is P1, and the opening pressure of the first pressure relief pipe is P2; p2 is more than P1 and less than or equal to 1.05P2.