CN108518494B

CN108518494B - piston type flow control valve

Info

Publication number: CN108518494B
Application number: CN201810550805.1A
Authority: CN
Inventors: 刘方圆
Original assignee: Shanghai Mingtong Industrial Development Group Co Ltd
Current assignee: Shanghai Mingtong Industrial Development (Group) Co., Ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2020-01-31
Anticipated expiration: 2038-06-01
Also published as: CN108518494A

Abstract

The invention relates to the field of valves , in particular to a piston type flow control valve which comprises a valve body, a valve core, a valve seat, a valve rod and a piston cylinder, wherein a piston is arranged in the piston cylinder, the end of the valve rod is connected with the piston, the end of the valve rod is connected with the valve core, and the side walls of the upper side cylinder body and the lower side cylinder body of the piston cylinder are respectively provided with an access port.

Description

piston type flow control valve

Technical Field

The invention relates to the field of valves , in particular to a piston type flow control valve with a valve core with good vibration resistance.

Background

The pneumatic control valve is mainly used for controlling a fluid medium conveying pipeline in the petrochemical industry, and is characterized in that high-pressure gas is adopted for control, the energy consumption is high, the provided driving force is small, and the gas compressibility is high, so that when the front and rear medium pressures of the valve are changed rapidly in the using process, the medium pressure is higher than the pressure of gas applied to a valve core through a piston, the vibration of the valve core can be caused, for example, when stop valves at two ends of a regulating valve are switched suddenly and suddenly, the rapidly flowing medium can generate strong reflection shock waves, and the valve core of the control valve is impacted by the reflection shock waves, when the force is higher than the downward pressure of a valve rod on the valve core, the valve core can move upwards to generate vibration, and when the valve is closed, the force applied to the piston by the high-pressure gas is continuously increased forces, when the force is not greatly different from the fluid medium pressure, the valve core and the valve seat can frequently impact, so that the service life of the valve core is influenced.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the main object of the present invention is to provide kinds of piston type flow control valves with good vibration resistance, which uses liquid to drive the piston, and has large driving force, small liquid compressibility, and smaller piston movement amplitude under impact, thereby reducing vibration.

The technical scheme includes that the piston type flow control valve comprises a valve body, a valve core, a valve seat, a valve rod and a piston cylinder, wherein a piston is arranged in the piston cylinder, the end of the valve rod is connected with the piston, the end of the valve rod is connected with the valve core, and the side walls of the upper cylinder body and the lower cylinder body of the piston cylinder are respectively provided with an access port.

And a guide sleeve is arranged between the base of the piston cylinder and the cylinder body at the lower side of the piston cylinder and is used for preventing hydraulic oil from leaking and guiding and restricting the valve rod and preventing the valve rod from inclining.

The upper flange, the upper cover body and the piston cylinder base of the valve body are integrally connected at by the aid of the stud bolts, so that the compactness of the structure is enhanced, the stability of the valve body is enhanced, and the installation space is saved.

fixed distance is reserved between the channel and the upper portion of the piston cylinder, fixed distance is reserved between the second channel and the lower portion of the piston cylinder, when the sliding block slides to the second channel or the second channel, the second channel or the second channel is blocked, hydraulic oil is prevented from continuously entering the auxiliary shock absorption cylinder, and therefore the sliding block is prevented from excessively compressing the spring, and the spring is prevented from failing.

The side wall of the valve body at the upper part of the valve seat is provided with a strengthening arc-shaped plate, and the side wall of the valve body at the lower part of the valve seat is also provided with a strengthening arc-shaped plate so as to strengthen the resistance of the valve body to fluid erosion.

Compared with the prior art, the invention has the advantages that:

1. the hydraulic drive is adopted to replace high-pressure gas drive, the driving force provided is larger, the valve with large flow rate and large valve port can be applied, the liquid compressibility is small, when the valve core is subjected to instant impact force, the upward moving amplitude is smaller, and the flow rate is more stable;

2. the auxiliary buffering cylinder is arranged, when the valve core is subjected to hydraulic fluctuation caused by instant impact force, hydraulic oil can enter the auxiliary buffering cylinder, the sliding block compression spring absorbs fluctuation energy, meanwhile, the size of the space and the size of the space II of the auxiliary buffering cylinder are changed by the movement of the sliding block, the change of the size of the upper side space and the size of the lower side space caused by the movement of the piston in the piston cylinder are compensated, the upper side pressure and the lower side pressure of the piston are basically stable, pressure difference cannot be generated on the upper side and the lower side of the piston due to volume change, the energy transmitted by the instant impact force of the valve core is only stored in the spring, the releasing is.

3. The piston cylinder base is directly connected with the flange at the upper part of the valve body and the upper cover body through the stud bolts at , so that the structure compactness is enhanced, the installation space is saved, and the stability of the valve body is stronger.

Drawings

FIG. 1 is a schematic view of a prior art pneumatic valve configuration;

FIG. 2 is a schematic view of the piston type flow control valve of the present application;

FIG. 3 is a schematic view of a piston cylinder and an auxiliary damping cylinder according to the present application;

in the figure, the shock absorber comprises a valve body 1, a valve body 2, a valve core 3, a valve seat 4, a valve rod 5, a piston cylinder 6, an auxiliary shock absorption cylinder 7, a piston 8, an upper access port 9, a lower access port 10, a slide block 11, springs I and 12, springs II and 13, channels and 14, channels II and 15, a guide sleeve 16, an upper flange 17, an upper cover body 18, a piston cylinder base 19, a stud bolt 20, arc plates I and 21, arc plates II and 22 and a thread seal pin.

Detailed Description

The invention is described in further detail with reference to the following embodiments of the drawings.

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the disclosure herein.

Referring to the drawings, the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. Meanwhile, the positional limitation terms used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship therebetween may be regarded as the scope of the present invention without substantial changes in the technical content.

The technical scheme of the invention is further illustrated in below with reference to fig. 2 and 3:

as shown in fig. 2, the piston type flow control valve comprises a valve body 1, a valve core 2, a valve seat 3, a valve rod 4 and a piston cylinder 5, wherein a piston 7 is arranged in the piston cylinder 5, a end of the valve rod 4 is connected with the piston 7, another end is connected with the valve core 2, and an upper access port 8 and a lower access port 9 are arranged on the side walls of upper and lower side cylinder bodies of the piston cylinder 5.

And a guide sleeve 15 is arranged between a base 18 of the piston cylinder 5 and a cylinder body at the lower side of the piston cylinder 5 and is used for preventing hydraulic oil from leaking, guiding and restricting the valve rod 4 and preventing the valve rod 4 from inclining.

The upper flange 16, the upper cover body 17 and the piston cylinder base 18 of the valve body 1 are integrally connected through the stud bolts 19, so that the structural compactness is enhanced, the stability of the valve body is enhanced, and the installation space is saved.

fixed distance is reserved between the channel 13 and the upper portion of the piston cylinder 5, fixed distance is reserved between the second channel 14 and the lower portion of the piston cylinder 5, when the sliding block 10 slides to the channel 13 or the second channel 14, the channel 13 or the second channel 14 is blocked, hydraulic oil is prevented from continuously entering the auxiliary shock absorption cylinder 6, and therefore the sliding block 10 is prevented from excessively compressing the spring I11 or the spring II12 to cause spring failure, and the upper portion of the auxiliary shock absorption cylinder 6 is further provided with a threaded sealing pin 22 for sealing the auxiliary shock absorption cylinder 6.

The side wall of the valve body 1 at the upper part of the valve seat 3 is provided with a strengthening arc-shaped plate I20, and the side wall of the valve body 1 at the lower part of the valve seat 3 is also provided with a strengthening arc-shaped plate II21 so as to enhance the resistance of the valve body to fluid erosion.

The working principle of the piston type flow control valve is as follows:

when the valve core needs to move downwards, hydraulic oil is added into the piston cylinder 5 through the upper access port 8, the hydraulic oil pushes the piston 7 to move downwards so as to drive the valve core 2 to move downwards, and when the valve core needs to move upwards, the hydraulic oil is added into the piston cylinder 5 through the lower access port 9, and the hydraulic oil pushes the piston 7 to move upwards so as to drive the valve core 2 to move upwards.

When the valve core 2 is subjected to impact force transmitted by instantaneous pressure change of a working fluid medium, the valve core 2 pushes the piston 7 through the valve rod 4 to generate a tendency of moving upwards, hydraulic oil on the upper side of the piston 7 is pressed to enter the auxiliary shock absorption cylinder 6 through the channel 13, and pushes the slider 10 to slide to compress the spring II12, after the instantaneous impact force disappears, energy accumulated by the spring II12 is released to push the slider 10 to move, and the piston 7 is driven to return to the original position through the hydraulic oil, when the valve core 2 is subjected to instantaneous downward acting force, the working principle is the same, only the slider 10 compresses the spring I11, because the movement of the piston 7 can change the volumes on the upper side and the lower side of the piston in the piston cylinder 5, the hydraulic pressure in the volumes can be changed, when the force of the piston 7 is disappeared by the valve core 2, the hydraulic pressure difference on the two sides can be transmitted to the force of the piston 7 to move, the restoring force of the piston 7 is fast and violent vibration, and the movement of the slider 10 can change the volumes on the upper side and the lower side of the piston 6, therefore, the energy can not be compensated by the change of the piston volume in the piston 5, and the energy can be effectively released only when the piston is.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1, piston type flow control valve, have valve body (1), case (2), disk seat (3), valve rod (4), piston cylinder (5), case (2) and disk seat (3) are located valve body (1), piston cylinder (5) are located valve body (1) upper portion, be equipped with piston (7) in piston cylinder (5), end connection piston (7) of valve rod (4), case (2) is connected to another end, be equipped with on the upper and lower side cylinder body lateral wall of piston cylinder (5) and insert mouth (8) and lower connection mouth (9), its characterized in that, piston cylinder (5) side is provided with supplementary bradyseism jar (6), supplementary bradyseism jar (6) internally mounted has slider (10), slider (10) divide supplementary bradyseism jar (6) inside into space and space two, install spring I (11) and spring II (12) in two spaces respectively, space is connected at with the cylinder body of the upside of piston cylinder (5) through passageway (13), the space two pass through the cylinder body (14) and is connected at downside;

the piston cylinder (5) is provided with a piston cylinder base (18), and a guide sleeve (15) is arranged between the piston cylinder base (18) and the piston cylinder (5);

an upper flange (16) and an upper cover body (17) are arranged at the upper part of the valve body (1), and the upper flange (16), the upper cover body (17) and a piston cylinder base (18) are integrally connected together by using a stud bolt (19);

fixed distance is reserved between the channel (13) and the upper part of the piston cylinder (5), fixed distance is reserved between the channel II (14) and the lower part of the piston cylinder (5), and the upper part of the auxiliary shock absorption cylinder (6) is also provided with a thread seal pin (22);

the side wall of the valve body (1) at the upper part of the valve seat (3) is provided with a strengthening arc-shaped plate I (20), and the side wall of the valve body (1) at the lower part of the valve seat (3) is also provided with a strengthening arc-shaped plate II (21).