CN117189555A

CN117189555A - Double-cavity high-pressure diaphragm buffer

Info

Publication number: CN117189555A
Application number: CN202311218007.6A
Authority: CN
Inventors: 祝雪金; 徐卫华; 周财华; 杨圆; 张钦召
Original assignee: DEPAMU (HANGZHOU) PUMP TECHNOLOGY CO LTD
Current assignee: DEPAMU (HANGZHOU) PUMP TECHNOLOGY CO LTD
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2023-12-08

Abstract

The invention discloses a double-cavity high-pressure diaphragm buffer, which comprises an inlet flange, an outlet flange and a cylinder body, wherein the cylinder body comprises a middle cylinder body, a left end socket and a right end socket which are respectively connected with two ends of the cylinder body, diaphragms are arranged at two ends of the middle cylinder body, a constant pressure device is further arranged on the cylinder body and communicated with the left chamber and the right chamber, so that the left chamber and the right chamber are at the same pressure.

Description

Double-cavity high-pressure diaphragm buffer

Technical Field

The invention relates to the field of buffers, in particular to a double-cavity high-pressure diaphragm buffer.

Background

The pulse damper is a pressure container for eliminating liquid pressure pulsation or flow pulsation in a pipeline, is generally arranged at an outlet of a delivery pump, and has the functions of buffering pulses output by the pump, reducing the influence of the pulses on a system, stabilizing the pressure and flow of fluid, eliminating pipeline vibration, protecting downstream instruments and equipment, increasing the volumetric efficiency of the pump and the like.

The prior pulse damper is a double-diaphragm type pulse damper like the one with the publication number of CN212361234U, and comprises an inlet flange and a middle cavity connected with the inlet flange, wherein the inlet flange is connected with the outer wall of the middle section of the middle cavity, the middle cavity is cylindrical, bowl-shaped partition boards inwards concave towards the middle section of the middle cavity are arranged at two ends of the middle cavity, and damping holes which are formed in opposite directions are formed in the bowl-shaped partition boards.

The prior art solutions described above have the following drawbacks: the whole is a single-air-chamber diaphragm pump, the volume of an internal buffer cavity is small, and the pressure bearing is relatively low.

In the high-flow medium pump, the bearing pressure can be improved by multiple under the premise of reducing the cost, the safety performance of the diaphragm is improved, deformation, damage and replacement are reduced, and the stability is good.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the invention provides a double-cavity high-pressure diaphragm buffer which has the advantages of large volume of an internal buffer cavity, relatively high bearing pressure and low overall transformation cost.

(II) technical scheme

In order to achieve the above purpose, the present invention provides the following technical solutions:

the double-cavity high-pressure diaphragm buffer comprises an inlet and outlet flange and a cylinder body, wherein the cylinder body comprises a middle cylinder body, a left sealing head and a right sealing head which are respectively connected to two ends of the cylinder body, diaphragms are arranged at two ends of the middle cylinder body, two diaphragms at the middle cylinder body and the two ends are enclosed to form a medium cavity, a diaphragm close to the left sealing head and the left sealing head are enclosed to form a left cavity, and a diaphragm close to the right sealing head and the right sealing head are enclosed to form a right cavity;

the cylinder is also provided with a constant pressure device which is communicated with the left chamber and the right chamber, so that the left chamber and the right chamber are at the same pressure.

Preferably, limiting devices are arranged on two sides of each diaphragm, and each limiting device is fixed on the cylinder.

Preferably, at the connection of the left end socket and the middle cylinder: one of the limiting devices is fixed on the left sealing head, the other limiting device is fixed on the middle cylinder body, and the two limiting devices are symmetrically arranged with the diaphragm as a center.

Preferably, each limiting device comprises a limiting plate and a limiting seat, and a spring is arranged between the limiting plate and the limiting seat.

Preferably, the limit seat is a bolt, a spring groove is formed in the left end socket, the bolt penetrates through the spring groove, the spring is sleeved on the bolt, one end of the spring is fixedly connected with the spring groove, the other end of the spring is connected with the limit seat, and the distance between the limit plate and the diaphragm is 50% -80% of the limit expansion distance of the diaphragm.

Preferably, the constant pressure device comprises a connecting pipe, one end of the connecting pipe is communicated with the left cavity, the other end of the connecting pipe is communicated with the right cavity, and sealing rings are arranged at two ends of the connecting pipe.

Preferably, the left end socket and the right end socket are both provided with connecting cavities, the connecting cavities comprise connecting bottom pipes, buffer pipes and connecting jacking pipes which are communicated in sequence, the buffer pipes and the connecting pipes are kept vertical, and sealing blocks are arranged at the tops of the buffer pipes.

Preferably, the connecting pipe is further provided with a pressure detection meter and an inflation device, and the inflation device comprises an inflation pipe and an inflation stop valve.

Preferably, the diaphragm is composed of a PTFE membrane and a rubber membrane, and the middle cylinder and the two PTFE membranes at the two ends are surrounded to form a medium cavity.

Preferably, the two ends of the middle cylinder body are provided with accommodating grooves, the left end socket and the right end socket are respectively clamped in the corresponding accommodating grooves, and the middle cylinder body is used for fixing the left end socket and the right end socket through end socket flanges.

(III) beneficial effects

Compared with the prior art, the invention provides the double-cavity high-pressure diaphragm buffer, which has the following beneficial effects:

1. according to the double-cavity high-pressure diaphragm buffer, the left cavity and the right cavity are arranged, so that the whole volume of buffer gas is doubled, the compressive strength is doubled, and the double-cavity high-pressure diaphragm buffer is suitable for a diaphragm pump of a large-flow medium;

2. the left cavity and the right cavity are communicated through the connecting pipe, so that the air pressure in the two cavities is ensured to be equal, and the problems that the two cavities are controlled independently, the pressure is different, the stress of the diaphragm is different, the whole deformation degree is different, and the service life is different are effectively avoided;

3. according to the double-cavity high-pressure diaphragm buffer, two chambers can be guaranteed to be at the same pressure level only by arranging one constant-pressure device on the connecting pipe, and the left chamber and the right chamber are controlled respectively without arranging two constant-pressure devices;

4. on the basis of doubling the whole volume of the buffer gas, only one pressure detection meter, an inflation tube and an inflation stop valve are needed to be arranged through one set of constant pressure device, when the pressure in the cavity is insufficient, the whole pressure can be adjusted only by operating inflation once, the equipment structure is reduced as a whole, and the equipment cost is also reduced;

5. the buffer tube is arranged in the connecting cavity, the buffer tube and the connecting tube have a certain angle, when the two chambers vibrate under different pressures in the working state, the buffer tube resists the vibration, so that the direct collision of internal gas is avoided, and the pressure of the diaphragm is reduced;

6. limiting devices are arranged on two sides of the diaphragm to limit the position of the diaphragm, so that the diaphragm is prevented from keeping a stretching limit position for a long time under high pressure, the limiting plates and the springs can provide reverse elastic force, the medium pressure borne by the diaphragm is reduced, and the service life of the medium diaphragm is prolonged;

7. the dielectric diaphragm adopts a two-layer structure, and a layer of rubber diaphragm is added on the basis of the traditional single-layer PTFE diaphragm, so that the toughness of the diaphragm is improved, and the service life is longer.

Drawings

FIG. 1 is a perspective view of a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 2 is a front view of a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 3 is a top view of a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 4 is a side exploded view of a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 5 is a schematic cross-sectional view of a cartridge in a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 6 is an enlarged view of portion A of FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic diagram of an assembly of a dual chamber high pressure diaphragm buffer of the present invention;

FIG. 8 is an enlarged view of portion B of FIG. 7;

FIG. 9 is an enlarged view of portion C of FIG. 7;

FIG. 10 is a schematic illustration of a specific construction of a bilayer separator of the present invention;

in the figure: the device comprises an inlet and outlet flange 1, a medium cavity 100, a left cavity 200, a right cavity 300, a cylinder 2, a cylinder 21, a containing groove 210, a seal head flange 211, a left seal head 22, a right seal head 23, a double-layer diaphragm 3, a PTFE membrane 31, a rubber membrane 32, a constant pressure device 4, a connecting pipe 41, a sealing ring 411, a connecting cavity 400, a connecting bottom pipe 410, a buffer pipe 420, a sealing block 421, a connecting jacking pipe 430, a pressure detection meter 42, an inflation stop valve 43, an inflation pipe 44, a limiting device 5, a limiting plate 51, a limiting seat 52, a bolt 521, a spring 53 and a spring groove 530.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to figures 1-10 of the drawings,

example 1

The utility model provides a diaphragm type double-chamber high-pressure buffer, includes import and export flange 1 and barrel 2, and diaphragm type double-chamber high-pressure buffer installs in the exit of diaphragm delivery pump, and import and export flange 1 is being connected pipeline, and the main effect of barrel 2 is buffering the pulse of pump output, reduces the influence of pulse to the system, plays stable fluid pressure and flow, eliminates pipeline vibration, protection low reaches instrument and meter, equipment, increases the effect such as pump volumetric efficiency.

As shown in fig. 2-5: the cylinder 2 comprises a middle cylinder 21 and a left sealing head 22 and a right sealing head 23 which are respectively connected with two ends of the cylinder 21, wherein two double-layer diaphragms 3 are arranged at two ends of the middle cylinder 21, a medium cavity 100 is formed by surrounding the middle cylinder 21 and the two diaphragms at two ends, a left cavity 200 is formed by surrounding the double-layer diaphragms 3 close to the left sealing head 22 and the left sealing head 22, and a right cavity 300 is formed by surrounding the diaphragms close to the right sealing head 23 and the right sealing head 23;

the cylinder body 2 is also provided with a constant pressure device 4, and the constant pressure device 4 is communicated with the left chamber 200 and the right chamber 300, so that the left chamber 200 and the right chamber 300 are under the same pressure.

As a further improvement of the present invention, the constant pressure device 4 includes a connection pipe 41, one end of the connection pipe 41 communicates with the left chamber 200, and the other end of the connection pipe 41 communicates with the right chamber 300. Sealing rings 411 are arranged at both ends of the connecting pipe 41, and in the process of communicating the two left chambers 200 and the right chamber 300, to maintain efficient sealing conditions, the sealing rings 411 are added at the joint of the connecting pipe 41 and the cylinder 2.

As a further improvement of the present invention, the connecting pipe 41 is further provided with a pressure detecting gauge 42 and an inflating device, which includes an inflating pipe 44 and an inflating stop valve 43.

As a further improvement of the invention, two ends of the middle cylinder 21 are provided with accommodating grooves 210, the left end socket 22 and the right end socket 23 are respectively clamped in the corresponding accommodating grooves 210, and the middle cylinder 21 fixes the left end socket 22 and the right end socket 23 through end socket flanges 211. According to the diaphragm type double-cavity high-pressure buffer, the whole volume of buffer gas is doubled by arranging the left cavity and the right cavity, the compression strength is doubled, and the diaphragm type double-cavity high-pressure buffer is suitable for diaphragm pumps with large-flow media.

As a further improvement of the invention, two sides of each double-layer diaphragm 3 are provided with limiting devices 5, and each limiting device 5 is fixed on the cylinder 2.

As a further development of the invention, at the junction of the left head 22 and the intermediate cylinder 21: wherein the first limiting device 5 is fixed on the left sealing head 22, the second limiting device 5 is fixed on the middle cylinder 21, and the two limiting devices 5 are symmetrically arranged by taking the double-layer diaphragm 3 as a center. Through setting up stop device in the both sides of diaphragm, the position of restriction diaphragm prevents that the diaphragm from keeping tensile extreme position for a long time under high pressure, and limiting plate and spring can provide reverse elasticity, reduce the medium pressure that the diaphragm receives, increase the life of medium diaphragm.

As a further improvement of the present invention, each of the limiting devices 5 includes a limiting plate 51 and a limiting seat 52, and a spring 53 is provided between the limiting plate 51 and the limiting seat 52. The spring 53 acts as an elastic member, and after the limiting plate 51 is subjected to pressure movement, the spring 53 is also pressed and provides a reaction force, so that the displacement of the limiting plate 51 is reduced.

As a further improvement of the invention, the limit seat is a bolt 521, the left end socket 22 is provided with a spring groove 530, the bolt 521 penetrates through the spring groove 530, the spring 53 is sleeved on the bolt 521, one end of the spring 53 is fixedly connected with the spring groove 530, and the other end of the spring 53 is connected with the limit seat 52.

The distance between the limiting plate 51 and the double-layer diaphragm 3 is 80% of the limit expansion distance of the diaphragm, and when the double-layer diaphragm 3 is about to reach a mechanical limit position, the limiting plate 51 provides reverse acting force to bear impact pressure in a pipeline, so that the bearing pressure of the double-layer diaphragm 3 is reduced, and deformation is reduced.

As a further improvement of the present invention, the left seal head 22 and the right seal head 23 are respectively provided with a connection cavity 400, the connection cavity 400 comprises a connection bottom tube 410, a buffer tube 420 and a connection top tube 430 which are communicated in sequence, and the buffer tube 420 and the connection tube 41 are vertical. The top of the buffer tube 420 is provided with a sealing block 421.

Buffer tube 420 is typically formed by drilling and then plugged with sealing block 421.

The buffer tube is arranged in the connecting cavity, the buffer tube and the connecting tube have a certain angle, and in the working state of the two chambers, when the two chambers vibrate under different pressure, the buffer tube resists the vibration, so that the direct collision of internal gas is avoided, and the pressure of the diaphragm is reduced.

As shown in fig. 7: as a further improvement of the invention, the double-layer diaphragm 3 consists of a PTFE diaphragm 31 and a rubber diaphragm 32, the middle cylinder 21 and the two PTFE diaphragms at the two ends are surrounded to form a medium cavity 100, and the diaphragm structure is formed by adding a layer of rubber diaphragm on the basis of the traditional single-layer PTFE diaphragm, so that the overall toughness of the diaphragm is improved, and the service life is longer.

Embodiment II,

A diaphragm type double-cavity high-pressure buffer comprises an inlet flange 1 and an outlet flange 2;

the cylinder 2 comprises a middle cylinder 21 and a left sealing head 22 and a right sealing head 23 which are respectively connected with two ends of the cylinder 21, wherein two double-layer diaphragms 3 are arranged at two ends of the middle cylinder 21, a medium cavity 100 is formed by surrounding the middle cylinder 21 and the two diaphragms at two ends, a left cavity 200 is formed by surrounding the double-layer diaphragms 3 close to the left sealing head 22 and the left sealing head 22, and a right cavity 300 is formed by surrounding the diaphragms close to the right sealing head 23 and the right sealing head 23;

The distance between the limiting plate 51 and the double-layer diaphragm 3 is 50% of the limit expansion distance of the diaphragm, and in order to better protect the double-layer diaphragm, the limiting plate 51 is arranged within 50% of the limit expansion stroke of the double-layer diaphragm 3.

When the double-layer diaphragm 3 is about to reach the mechanical limit position, the limiting plate 51 provides reverse acting force to bear the impact pressure in the pipeline, so that the bearing pressure of the double-layer diaphragm 3 is reduced, and the deformation is reduced.

Working principle: according to the diaphragm type double-cavity high-pressure buffer, the whole volume of buffer gas is doubled by arranging the left cavity 200 and the right cavity 300, and the compression strength is doubled, so that the diaphragm type double-cavity high-pressure buffer is suitable for a diaphragm pump of a large-flow medium; moreover, the left chamber 200 and the right chamber 300 are communicated through the connecting pipe 41, so that the air pressure in the two chambers is ensured to be equal, and the problems that the pressure is different, the stress of the double-layer diaphragm 3 is different, the whole deformation degree is different and the service life is different due to the independent control of the two chambers are effectively avoided.

The constant pressure device 4 is arranged on the connecting pipe 41 to ensure that two chambers are at the same pressure level, namely, only one pressure detection meter 42, an air charging pipe 44 and an air charging stop valve 43 are needed, when the pressure inside the chamber is insufficient, the whole pressure can be adjusted only by operating and charging once, the equipment structure is reduced as a whole, the equipment cost is reduced, and the left chamber 200 and the right chamber 300 are not needed to be controlled by two constant pressure devices respectively.

Through setting up stop device 5 in the both sides of diaphragm, the position of restriction bilayer diaphragm prevents that bilayer diaphragm from keeping tensile extreme position for a long time under high pressure, and limiting plate 51 and spring 53 can provide reverse elasticity, reduce the fluid medium pressure that bilayer diaphragm 3 receives, increase the compressive capacity of medium diaphragm.

The dielectric diaphragm adopts a two-layer structure, and a layer of rubber diaphragm 32 is added on the basis of the traditional single-layer PTFE diaphragm 31, so that the toughness of the diaphragm is improved, and the service life is longer.

The whole principle is as follows:

it is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a two-chamber high pressure diaphragm buffer, includes access flange (1) and barrel (2), its characterized in that: the cylinder body (2) comprises a middle cylinder body (21) and a left end socket (22) and a right end socket (23) which are respectively connected to two ends of the cylinder body (21), the two ends of the middle cylinder body (21) are respectively provided with a diaphragm (3), the middle cylinder body (21) and two diaphragms at the two ends are surrounded to form a medium cavity (100), the diaphragm (3) close to the left end socket (22) and the left end socket (22) are surrounded to form a left cavity (200), and the diaphragm close to the right end socket (23) and the right end socket (23) are surrounded to form a right cavity (300);

the cylinder body (2) is also provided with a constant pressure device (4), and the constant pressure device (4) is communicated with the left chamber (200) and the right chamber (300) so that the left chamber (200) and the right chamber (300) are at the same pressure.

2. A dual chamber high pressure diaphragm buffer as defined in claim 1, wherein: limiting devices (5) are arranged on two sides of each diaphragm (3), and each limiting device (5) is fixed on the cylinder body (2).

3. A dual chamber high pressure diaphragm buffer as defined in claim 2, wherein: at the joint of the left end socket (22) and the middle cylinder body (21): one of the limiting devices (5) is fixed on the left sealing head (22), the other limiting device (5) is fixed on the middle cylinder (21), and the two limiting devices (5) are symmetrically arranged with the diaphragm (3) as a center.

4. A dual chamber high pressure diaphragm buffer as defined in claim 3, wherein: each limiting device (5) comprises a limiting plate (51) and a limiting seat (52), and a spring (53) is arranged between the limiting plate (51) and the limiting seat (52).

5. A dual chamber high pressure diaphragm buffer as defined in claim 4, wherein: the limiting seat is a bolt (521), a spring groove (530) is formed in the left sealing head (22), the bolt (521) penetrates through the spring groove (530), the spring (53) is sleeved on the bolt (521), one end of the spring (53) is fixedly connected with the spring groove (530), the other end of the spring (53) is connected with the limiting seat (52), and the distance between the limiting plate (51) and the diaphragm (3) is 50% -80% of the limit expansion distance of the diaphragm.

6. A dual chamber high pressure diaphragm buffer as defined in claim 1, wherein: the constant pressure device (4) comprises a connecting pipe (41), one end of the connecting pipe (41) is communicated with the left cavity (200), the other end of the connecting pipe (41) is communicated with the right cavity (300), and sealing rings (411) are arranged at two ends of the connecting pipe (41).

7. A dual chamber high pressure diaphragm buffer as defined in claim 6, wherein: the left seal head (22) and the right seal head (23) are both provided with a connecting cavity (400), the connecting cavity (400) comprises a connecting bottom tube (410), a buffer tube (420) and a connecting top tube (430) which are communicated in sequence, the buffer tube (420) and the connecting tube (41) are kept vertical, and the top of the buffer tube (420) is provided with a sealing block (421).

8. A dual chamber high pressure diaphragm buffer as defined in claim 6, wherein: the connecting pipe (41) is also provided with a pressure detection meter (42) and an inflation device, and the inflation device comprises an inflation pipe (44) and an inflation stop valve (43).

9. A dual chamber high pressure diaphragm buffer as defined in claim 4, wherein: the diaphragm (3) consists of a PTFE membrane (31) and a rubber membrane (32), and a medium cavity (100) is formed by the middle cylinder (21) and two PTFE membranes at two ends.

10. A dual chamber high pressure diaphragm buffer as defined in claim 9, wherein: the two ends of the middle cylinder body (21) are provided with accommodating grooves (210), the left end socket (22) and the right end socket (23) are respectively clamped in the corresponding accommodating grooves (210), and the middle cylinder body (21) is used for fixing the left end socket (22) and the right end socket (23) through end socket flanges (211).