CN215370983U

CN215370983U - Constant volume valve for high pressure test

Info

Publication number: CN215370983U
Application number: CN202120841167.6U
Authority: CN
Inventors: 洪扁; 徐煦; 周宇仁; 林正皓; 潘征宇
Original assignee: Shanghai Institute of Measurement and Testing Technology
Current assignee: Shanghai Institute of Measurement and Testing Technology
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-12-31
Anticipated expiration: 2031-04-22

Abstract

The utility model provides a constant volume valve for high-pressure test, which comprises a valve body, a valve seat, a valve needle and a valve rod, wherein the valve body is provided with an overflowing channel and an outlet channel, the overflowing channel penetrates through the valve body and is communicated with the outlet channel, the valve seat is detachably arranged in the overflowing channel, the valve seat is provided with a valve seat channel penetrating through the valve seat, the valve needle is arranged in the overflowing channel in a sliding mode and is opposite to the valve seat channel, the valve rod is arranged in the overflowing channel in a rotating mode, the valve needle can be in threaded connection with the valve rod, the valve needle can rotate in the forward direction and the reverse direction along with the valve rod, the valve needle moves in the overflowing channel to open and close the communication between the valve seat channel and the outlet channel, the operation is convenient, and the constant volume effect is effectively ensured.

Description

Constant volume valve for high pressure test

Technical Field

The utility model relates to the field of valves, in particular to a constant volume valve for high-pressure testing.

Background

The pressure range for pressure measurement is from several Pa to 2000 MPa, and is generally classified into a micro pressure (<10kPa), a low pressure (0.01MPa to 0.25MPa), a medium pressure (0.25MPa to 100MPa), a high pressure (>100MPa), and an ultra high pressure (>600 MPa). The pressure-transmitting medium mainly includes gas, liquid and other fluids. The valve is very key in pressure measurement, the safety and the sealing performance of the valve are important factors for ensuring accurate transmission of the pressure value, in the measurement value transmission of a direct comparison method, when a communication node of a pipeline is switched, the volume of fluid in the pipeline is kept unchanged, the original balance of pressure is not damaged, the pressure balance time is favorably shortened, and the operability and the reliability in precision pressure measurement are improved.

At present, pressure valves in industrial application mainly comprise one-way valves, overflow valves, stop valves, check valves and the like, and with the rapid development of the valve industry, the pressure valves have higher requirements on technical parameters, strong corrosion resistance, service life, application structures and the like of the valves.

For example, in the constant volume pressure valve shown in fig. 1, the valve rod and the sealing section adopt a three-section structure, which is an upper valve rod, a sealing middle section and a lower valve rod, which are fixedly connected, and the valve rod is driven by gas to move up and down to drive the sealing middle section to move up and down linearly and to be matched with the valve body to achieve the stop and the isolation of the pipeline. Then, as shown in the attached figure 2, the constant volume valve drives the lifting structure through gas to drive the valve rod and the sealing structure to move up and down, so as to achieve the characteristics of constant volume and valve on-off. Both of the above valves have the following disadvantages:

(1) under the ultrahigh pressure environment, the pressure valve with the structure cannot be used under high pressure (>200MPa), the pressure valve is sealed by adopting a valve ball and an air driving structure, the sectional area of the valve ball is large, so that the valve rod is stressed too much under high pressure, a structural member cannot support large pressure and yield, the valve ball is not sealed tightly, and secondly, the valve rod is stressed greatly, and the air driving structure cannot provide large supporting force, so that the pressure valve is not suitable for being used under high pressure.

(2) The gas filling body drives to control the valve to be opened, the operation is complex, the efficiency is low, and the valve is not suitable for occasions needing frequent opening and closing of the valve.

(3) The upper section and the lower section of the valve rod can not be changed in the same volume completely in the moving process, and the constant volume effect can not be completely realized.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides the constant volume valve for the high-pressure test, which is convenient to operate and can effectively ensure the constant volume effect.

The utility model provides a constant volume valve for high pressure test, includes valve body, disk seat, needle and valve rod, the valve body seted up overflow the passageway with exit channel, overflow the passageway and run through the valve body, and with exit channel intercommunication, disk seat detachably install in overflow in the passageway, the disk seat has been seted up and has been run through the disk seat passageway of disk seat, the needle slide set up in overflow in the passageway, and with the disk seat passageway is relative, the valve rod rotate set up in overflow in the passageway, the needle can with the valve rod spiro union, just the needle can be along with the positive reverse rotation of valve rod overflow and remove in the passageway and open and close the disk seat passageway with intercommunication between the exit channel.

Optionally, the flow passage includes a flow guiding section and a sealing section which are communicated with each other, the outlet passage is communicated with the sealing section, the valve needle is located in the sealing section, a first step is formed between the flow guiding section and the sealing section, and the valve seat is located in the flow guiding section and abuts against the first step.

Optionally, the first locking nut is screwed to the side, away from the sealing section, of the flow guide section, so that the valve seat is detachably mounted between the first step and the first locking nut.

Optionally, the matching surface of the valve seat and the first step is conical; the matching surface of the valve seat and the first locking nut is conical.

Optionally, the valve further comprises a sealing assembly, and the sealing assembly is sleeved between the valve rod and the valve body.

Optionally, the valve further comprises a first locking member and a second locking member, wherein the first locking member and the second locking member are sleeved on the valve rod and abut against the upper side and the lower side of the sealing assembly.

Optionally, the first locking member is provided with a plurality of insertion parts, and the insertion parts penetrate through the sealing assembly.

Optionally, still include second lock nut, the second lock nut cover is established on the valve rod, and with the passageway deviates from overflow first lock nut one end spiro union, in order to lock first retaining member the second retaining member with seal assembly.

Optionally, a roller is included and is disposed between the valve stem and the second retaining nut, and/or the valve stem and the first retaining member.

Optionally, the valve further comprises a handle, and one end of the valve rod extending to the outside of the overflowing channel is connected with the handle.

Compared with the prior art, the technical scheme has the following advantages:

the valve needle is along with linear motion about the rotation of valve rod realizes, and only be in the valve rod with the motion in the sealed cavity that forms between the disk seat has only played the fluid motion in the valve body can not cause the fluid motion in the connecting tube, can not break pressure balance to and can not change sealed cavity's inner volume, can not arouse pressure variation more, effectively guarantee the constant volume effect. The constant volume valve can control the opening and closing of the valve by rotating the valve rod positively and negatively, is convenient to operate, effectively improves the working efficiency and effectively increases the use occasions. In addition, a sealing assembly is arranged between the valve rod and the overflowing channel, and the sealing assembly and the valve seat are positioned on two sides of the sealing section, so that the valve needle moves up and down in the sealing section, and the sealing performance is improved. The valve seat is detachably arranged in the flow guide section, so that the valve seat is convenient to install and replace, the maintenance cost is reduced, and the use efficiency and the value are improved.

The utility model is further described with reference to the following figures and examples.

Drawings

FIG. 1 is a schematic structural diagram of a conventional constant volume pressure valve;

FIG. 2 is a schematic structural diagram of a conventional constant volume valve;

FIG. 3 is a schematic structural view of a constant volume valve for high pressure testing according to the present invention;

FIG. 4 is an enlarged view of A in FIG. 3;

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

In the figure: 100 valve body, 110 flow passage, 111 flow guide section, 112 sealing section, 113 corner, 114 first step, 115 control section, 116 second step, 120 outlet passage, 200 valve seat, 210 valve seat passage, 300 valve needle, 400 valve stem, 410 abutting part, 510 first lock nut, 520 second lock nut, 600 sealing component, 610 first sealing ring, 620 second sealing ring, 710 first locking member, 711 plugging part, 720 second locking member, 800 handle, 810 handle pin, 910 first steel ball, 920 second steel ball.

Detailed Description

The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

As shown in fig. 3, the constant volume valve for high pressure test includes a valve body 100, a valve seat 200, a valve needle 300 and a valve rod 400, the valve body 100 is provided with an overflow channel 110 and an outlet channel 120, the overflow channel 110 penetrates through the valve body 100 and is communicated with the outlet channel 120, the valve seat 200 is detachably installed in the overflow channel 110, the valve seat 200 is provided with a valve seat channel 210 penetrating through the valve seat 200, the valve needle 300 is slidably disposed in the overflow channel 110 and is opposite to the valve seat channel 210, the valve rod 400 is rotatably disposed in the overflow channel 110, the valve needle 300 can be screwed with the valve rod 400, and the valve needle 300 can rotate in the overflow channel 110 in the forward and reverse directions of the valve rod 400 to open and close the communication between the valve seat channel 210 and the outlet channel 120.

With continued reference to fig. 3, the valve seat 200 is located at the lower portion of the valve body 100, the valve rod 400 is located at the upper portion of the valve body 100, the outlet channel 120 is located at the upper portion of the valve seat 200 and is communicated with the transfer channel 110, and the valve needle 300 is located between the valve rod 400 and the valve seat 200 and can move along the transfer channel 110 to open and close the communication between the valve seat channel 210 and the outlet channel 120. Specifically, since the valve rod 400 and the valve needle 300 are screwed, rotating the valve rod 400 can drive the valve needle 300 to move upward, so that the outlet channel 120 and the valve seat channel 210 are opened, and the two are communicated, at this time, the fluid flows in from the lower part of the overflow channel 110, enters the valve seat channel 210, and is discharged along with the outlet channel 120. The valve rod 400 is rotated reversely to move the valve needle 300 away from the valve rod 400, so that the valve needle 300 moves downward and simultaneously blocks the seat channel 210 and the outlet channel 120, thereby closing the communication between the seat channel 210 and the outlet channel 120, wherein the outlet channel 120 and the lower portion of the transfer channel 110 can be correspondingly installed with a connecting pipe for fluid transmission.

Therefore, the constant volume valve can control the opening and closing of the valve by rotating the valve rod 400 positively and negatively, is convenient to operate, effectively improves the working efficiency and effectively increases the use occasions. The valve needle 300 is along with the rotation of the valve rod 400 realizes the up-and-down linear motion, and only the valve rod 400 and the motion in the sealing cavity formed between the valve seats 200 only play the motion of the fluid in the valve body 100, which does not cause the motion of the fluid in the connecting pipeline, does not break the pressure balance, does not change the inner volume of the sealing cavity, does not cause the pressure change, and effectively ensures the constant volume effect.

As shown in fig. 3, the transfer passage 110 includes a guide section 111 and a sealing section 112 which are communicated with each other, the guide section 111 extends from the lower portion of the valve body 100 to the sealing section 112, the sealing section 112 extends from the guide section 111 to the upper portion of the valve body 100, wherein the outlet passage 120 is communicated with the sealing section 112, the valve needle 300 is located in the sealing section 112 and is screwed with the valve stem 400 located at the upper portion of the valve body 100, and the valve seat 200 is located in the guide section 111.

The end of the valve needle 300 facing away from the valve rod 400 is provided with a tip portion with a gradually reduced width, and the tip portion can be inserted into the valve seat passage 210 to block the valve seat passage 210. One end of the valve needle 300, which faces away from the valve seat 200, is provided with a threaded hole to be screwed with the valve rod 400. The valve needle 300 blocks the outlet passage 120 with its sidewall, and when the valve needle 300 moves upward, the outlet passage 120 communicates with the seat passage 210. It is noted that the sealing section 112 is adapted to the cross-sectional shape of the valve needle 300, so as to limit the valve needle 300 to only move up and down, thereby preventing the valve needle 300 from rotating with the valve stem 400. In one example, the valve pin 300 and the sealing section 112 are circular in cross-section.

As shown in fig. 3, the cross-section of the flow guide section 111 is larger than that of the sealing section 112, so that a first step 114 is formed between the flow guide section 111 and the sealing section 112, and a corner 113 is formed between the flow guide section 111 and the sealing section 112. The valve seat 200 is located in the flow guiding section 111 and abuts on the connection between the flow guiding section 111 and the sealing section 112, i.e. the first step 114. Further, the cross section of the valve seat 200 is matched with the cross section of the flow guide section 111, the matching surface of the valve seat 200 and the first step 114 is tapered to abut against a corner 113 formed between the flow guide section 111 and the sealing section 112, and the valve seat 200 deforms under the action of an external force to realize the sealing connection between the valve seat 200 and the valve body 100, so as to prevent the fluid from flowing back between the flow guide section 111 and the valve seat 200.

Optionally, the valve seat 200 is detachably mounted in the flow guide section 111, so that the valve seat 200 is conveniently mounted and replaced, maintenance cost is reduced, and use efficiency and value are improved. Specifically, the constant volume valve further comprises a first locking nut 510, wherein the first locking nut 510 is located on a side of the valve seat 200 facing away from the valve needle 300 and is in threaded connection with the flow guide section 111, so that the valve seat 200 is detachably mounted between the first step 114 and the first locking nut 510. Wherein the first lock nut 510 has a hollow structure such that fluid is transmitted into the seat channel 210 through the first lock nut 510.

Specifically, the mating surfaces of the valve seat 200 and the first lock nut 510 are also tapered, so that the valve seat 200 is deformed to seal the valve seat 200 and the valve body 100 under the pre-tightening pressure of the first lock nut 510.

As shown in fig. 3 and 4, the constant volume valve further comprises a sealing assembly 600, the sealing assembly 600 is sleeved between the valve rod 400 and the valve body 100, so that the sealing performance is improved, and the sealing of the valve rod 400 in the high-pressure environment is facilitated.

The sealing assembly 600 may be a sealing structure formed by combining a plurality of sealing rings, and referring to fig. 5, the sealing assembly 600 includes two first sealing rings 610 and a second sealing ring 620, and the two first sealing rings 610 are located at two sides of the second sealing ring 620.

As shown in fig. 4, the constant volume valve further comprises a first locking member 710 and a second locking member 720, wherein the first locking member 710 and the second locking member 720 are sleeved on the valve rod 400 and abut against the upper side and the lower side of the sealing assembly 600 to lock the sealing assembly 600, so that the sealing failure is prevented and the use effect is influenced.

Specifically, the first locking member 710 is provided with a plurality of insertion parts 711, and the insertion parts 711 penetrate through the sealing assembly 600, so that the sealing assembly 600 is fixed between the first locking member 710 and the second locking member 720. Wherein the second locking member 720 may be a nut. Preferably, the insertion parts 711 are arranged in a circumferential array along the axis of the first locking member 710.

More specifically, referring to fig. 4, the transfer channel 110 further includes a control section 115, the control section 115 is located on a side of the sealing section 112 facing away from the flow guiding section 111, wherein a cross-sectional area of the control section 115 is larger than a cross-sectional area of the sealing section 112, so that a second step 116 is formed between the control section 115 and the sealing section 112. The sealing assembly 600 is located in the control section 115, and the second locking member 720 abuts against the second step 116, so as to fix the sealing assembly 600.

As shown in fig. 3, the constant volume valve further comprises a second locking nut 520, the second locking nut 520 is sleeved on the valve rod 400, and is screwed with one end of the overflowing channel 110 departing from the first locking nut 510, so as to lock the first locking member 710, the second locking member 720 and the sealing assembly 600.

As shown in fig. 3, the constant volume valve further includes a rolling member, and the rolling member is disposed between the valve stem 400 and the second lock nut 520, and/or between the valve stem 400 and the first lock member 710, so that sliding friction between the two is changed into rolling friction, and the valve stem 400 is rotated more easily. The rolling member includes a first steel ball 910 and a second steel ball 920, the first steel ball 900 is located between the second lock nut 520 and the valve stem 400, and the second steel ball 920 is located between the first lock member 710 and the valve stem 400.

Specifically, the valve rod 400 is provided with an abutting portion 410, the first steel ball 910 is located between the abutting portion 410 and the second lock nut 520, and the second steel ball 920 is located between the abutting portion 410 and the first lock member 710. The first and

second steel balls

910, 920 may not be the same size, e.g., the first steel ball 910 is larger than the second steel ball 920. By providing the abutting portion 410, not only the first steel ball 910 and the second steel ball 920 are fixed, but also the valve stem 400 is prevented from moving up and down, and thus the valve stem 400 only rotates.

As shown in fig. 3, the constant volume valve further includes a handle 800, one end of the valve rod 400 extending to the outside of the overflow channel 110 is connected with the handle, and a user rotates the handle 800 to drive the valve rod 400 to rotate. The handle 800 is secured to the valve stem 400 using a handle pin 810.

In summary, the valve needle 300 moves up and down linearly along with the rotation of the valve rod 400 and only moves in the sealing cavity formed between the valve rod 400 and the valve seat 200, so that the fluid in the valve body 100 moves, the fluid in the connecting pipeline does not move, the pressure balance cannot be broken, the inner volume of the sealing cavity cannot be changed, the pressure change cannot be caused, and the constant volume effect is effectively ensured. The constant volume valve can control the opening and closing of the valve by rotating the valve rod 400 positively and negatively, is convenient to operate, effectively improves the working efficiency and effectively increases the use occasions. In addition, a sealing assembly 600 is arranged between the valve rod 400 and the overflowing channel 110, and the sealing assembly 600 and the valve seat 200 are positioned at two sides of the sealing section 112, so that the valve needle 300 moves up and down in the sealing section 112, and the sealing performance is improved. The valve seat 200 is detachably mounted in the flow guide section 111, so that the valve seat 200 is mounted and replaced conveniently, maintenance cost is reduced, and use efficiency and value are improved.

Besides, those skilled in the art can also change the shape, structure and material of the valve body 100 and the valve seat 200 according to the actual situation, and the specific embodiments of the present invention are not limited thereto as long as the technical solution the same as or similar to the present invention is adopted based on the above disclosure of the present invention, the technical problem the same as or similar to the present invention is solved, and the technical effect the same as or similar to the present invention is achieved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are given by way of example only and are not limiting of the utility model. The objects of the utility model have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. The constant volume valve for the high-pressure test is characterized by comprising a valve body (100), a valve seat (200), a valve needle (300) and a valve rod (400), wherein the valve body (100) is provided with an overflowing channel (110) and an outlet channel (120), the overflowing channel (110) penetrates through the valve body (100) and is communicated with the outlet channel (120), the valve seat (200) is detachably installed in the overflowing channel (110), the valve seat (200) is provided with a valve seat channel (210) penetrating through the valve seat (200), the valve needle (300) is slidably arranged in the overflowing channel (110) and is opposite to the valve seat channel (210), the valve rod (400) is rotatably arranged in the overflowing channel (110), the valve needle (300) can be in threaded connection with the valve rod (400), and the valve needle (300) can rotate along with the forward and reverse directions of the valve rod (400), moves within the transfer passage (110) to open and close communication between the seat passage (210) and the outlet passage (120).

2. The constant volume valve for high pressure test according to claim 1, wherein the flow passage (110) comprises a flow guide section (111) and a sealing section (112) which are communicated with each other, the outlet passage (120) is communicated with the sealing section (112), the valve needle (300) is positioned in the sealing section (112), a first step (114) is formed between the flow guide section (111) and the sealing section (112), and the valve seat (200) is positioned in the flow guide section (111) and abuts against the first step (114).

3. The constant volume valve for high pressure test according to claim 2, further comprising a first locking nut (510), wherein the first locking nut (510) is screwed on the side of the flow guide section (111) facing away from the sealing section (112), so that the valve seat (200) is detachably mounted between the first step (114) and the first locking nut (510).

4. The constant volume valve for high pressure test according to claim 3, wherein the mating surface of the valve seat (200) and the first step (114) is tapered; the matching surface of the valve seat (200) and the first locking nut (510) is conical.

5. The constant volume valve for high pressure test according to claim 3, further comprising a sealing assembly (600), wherein the sealing assembly (600) is sleeved between the valve rod (400) and the valve body (100).

6. The constant volume valve for high pressure test according to claim 5, further comprising a first locking member (710) and a second locking member (720), wherein the first locking member (710) and the second locking member (720) are sleeved on the valve rod (400) and abut against the upper side and the lower side of the sealing assembly (600).

7. Constant volume valve for high pressure tests according to claim 6, characterized in that said first retaining member (710) is provided with a plurality of spigots (711), said spigots (711) penetrating said sealing assembly (600).

8. The constant volume valve for high pressure test according to claim 6, further comprising a second locking nut (520), wherein the second locking nut (520) is sleeved on the valve rod (400) and is screwed with one end of the overflowing channel (110) away from the first locking nut (510) to lock the first locking member (710), the second locking member (720) and the sealing assembly (600).

9. The constant volume valve for high pressure testing according to claim 8, further comprising a rolling member disposed between the valve stem (400) and the second lock nut (520), and/or the valve stem (400) and the first lock member (710).

10. The constant volume valve for high pressure test according to claim 1, further comprising a handle (800), wherein the handle (800) is connected to one end of the valve rod (400) extending to the outside of the overflowing channel (110).