CN217878131U - Unilateral overvoltage protection structure and double-diaphragm differential pressure gauge - Google Patents

Abstract

The utility model discloses a unilateral overvoltage protection structure, include: a main body; the corrugated diaphragm comprises a first corrugated diaphragm and a second corrugated diaphragm which are respectively arranged on two sides of the main body in a sealing mode, a first filling liquid cavity is formed between the first corrugated diaphragm and the main body, a second filling liquid cavity is formed between the second corrugated diaphragm and the main body, and the main body is provided with a filling liquid communicating cavity which is communicated with the first filling liquid cavity and the second filling liquid cavity; the ejector rod device is used for pushing a transmission shaft of the double-diaphragm differential pressure gauge to rotate and is connected with the first corrugated diaphragm to act along with the first corrugated diaphragm; cutting device sets up on the ejector pin device, and when first ripple diaphragm was excessive pressure, the ejector pin device drove cutting device and blocks filling liquid intercommunication chamber, and first filling liquid chamber communicates with filling liquid intercommunication chamber disconnection, and first ripple diaphragm no longer produces the deformation to form the guard action to first ripple diaphragm, the utility model also discloses a two diaphragm differential pressure meters.

Description

Unilateral overvoltage protection structure and double-diaphragm differential pressure gauge

Technical Field

The utility model relates to a differential pressure table field especially relates to a unilateral overvoltage protection structure and two diaphragm differential pressure tables.

Background

The double-diaphragm differential pressure gauge is a special pressure gauge for indicating a pressure difference value, can bear the static pressure of 40MPa at most on one side, has the indicated pressure difference value range of 16 KPa-2.5 MPa, and is widely applied to a plurality of engineering projects of gas transmission pipelines, oil transmission pipelines, booster pump stations, nuclear power stations and the like in the industries of chemical engineering, machinery, petroleum and the like.

With the continuous development of various domestic large-scale engineering projects and the continuous localization requirements of special instruments, the demand on the differential pressure gauge is more and more increased, and meanwhile, higher requirements are provided for the use of the differential pressure gauge.

The double-diaphragm differential pressure gauge has the condition that improper use or misoperation causes the pipeline pressure to increase suddenly in the use process, so that the gauge is over-pressurized instantly, the pressure of the corrugated diaphragm is too high to exceed the elastic range of the design pressure, the corrugated diaphragm is plastically deformed and cannot be restored to the original shape, and the gauge is damaged and cannot be normally used or even scrapped. In the prior art, the conventional solution is to process the main body opposite to the corrugated diaphragm into a corrugated protection surface matched with the shape of the corrugated diaphragm; another solution is to add an overvoltage protector to the dual diaphragm differential pressure gauge, however both of these approaches have certain drawbacks.

Method of forming the corrugated diaphragm and corrugated protective surface as shown in fig. 1-2, corrugated protective surface 400 conforms to the corrugated shape of the surface of corrugated diaphragm 200. However, this method is very demanding for the machining process, and there is no reliable standard formula for the design of the bellows diaphragm 200 to calculate, and it is mostly determined the geometric size and the pressure range of the bellows diaphragm 200 through rough calculation and trial and error. Therefore, it is difficult to design and measure the outer shape of the corrugated diaphragm 200, especially the outer shape of the corrugated surface thereof, and the inaccuracy of the drawing paper may cause the deviation between the corrugated protection surface 400 and the corrugations of the upper surface of the corrugated diaphragm 200, and the machining accuracy of the corrugated diaphragm 200 may be affected by the thickness of the material, the hardness of the material, the pressure of the oil press, and other factors, thereby further deepening the deviation between the corrugated protection surface 400 and the corrugated diaphragm 200. Thus, the overpressure protection effect on the corrugated membrane 200 is not obvious, and in the case of a large overpressure, the corrugated protection surface 400 does not fit with the corrugated membrane 200, which may cause damage to the local shape of the corrugated membrane 200.

The method using the overvoltage protector is shown in fig. 3, and the method has the following problems: (1) The overvoltage protector is large in size, occupies the space of the instrument, and causes the instrument to be heavy in appearance and inconvenient to install; (2) The range of the instrument is more, the selectable range of the overvoltage protector is limited, and not all instruments can be provided with proper overvoltage protectors for use; (3) the product cost is increased.

Therefore, how to reduce the requirement on the machining process of the double-diaphragm differential pressure gauge on the premise of ensuring the function of unilateral overvoltage and simultaneously avoid the problems caused by using an overvoltage protector is a technical problem to be solved by the technical personnel in the field at present.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a unilateral overvoltage protection structure, which can reduce the requirement for the machining process of the dual-diaphragm differential pressure gauge on the premise of ensuring the unilateral overvoltage function, and avoid the problems caused by using an overvoltage protector;

another object of the present invention is to provide a double-diaphragm differential pressure gauge with the above single-side overvoltage protection structure.

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

a single-sided overvoltage protection structure for a dual diaphragm differential pressure gauge, comprising:

a main body;

the corrugated diaphragm comprises a first corrugated diaphragm and a second corrugated diaphragm which are respectively arranged on two sides of the main body in a sealing manner, a first filling liquid cavity is formed between the first corrugated diaphragm and the main body, a second filling liquid cavity is formed between the second corrugated diaphragm and the main body, and a filling liquid communication cavity communicated with the first filling liquid cavity and the second filling liquid cavity is formed in the main body;

the ejector rod device is used for pushing a transmission shaft of the double-diaphragm differential pressure gauge to rotate and is connected with the first corrugated diaphragm to act along with the first corrugated diaphragm;

and the cutting device is arranged on the ejector rod device, and when the first corrugated membrane is in overpressure, the ejector rod device drives the cutting device to cut off the filling liquid communicating cavity.

Optionally, in the above single-side overvoltage protection structure, an inner sunken groove is provided in the main body, and the inner sunken groove is disposed on a side surface close to the first corrugated diaphragm and is used for communicating the first filling liquid cavity with the filling liquid communication cavity;

and when the cutting device moves along with the ejector rod device to abut against the bottom of the inner sunken groove, the filling liquid communicating cavity is cut off.

Optionally, in the above single-side overvoltage protection structure, the cut-off device is located in an area covered by the inner sunken groove, and when the double-diaphragm differential pressure gauge is not under pressure, the cut-off device and a groove bottom of the inner sunken groove have a preset gap H.

Optionally, in the above unilateral overvoltage protection structure, the ejector device is provided with a positioning step, the cutting device is sleeved on the ejector device, and one side of the cutting device abuts against the positioning step.

Optionally, in the above single-side overvoltage protection structure, the first corrugated diaphragm is provided with a mounting hole, one end of the ejector rod device extends into the mounting hole and is in transmission connection with a transmission shaft of the double-diaphragm differential pressure gauge, and a side wall of the mounting hole is in sealing connection with the ejector rod device.

Optionally, in the above single-side overvoltage protection structure, the ejector rod device includes a screw rod and a nut;

one end of the screw penetrates through the mounting hole of the first corrugated membrane, extends into the filling liquid communicating cavity and is in transmission connection with a transmission shaft of the double-membrane differential pressure gauge, the positioning step is arranged on the screw, the screw is in threaded fit with the nut, and the part, at the mounting hole, of the first corrugated membrane is tightly pressed on the positioning step in a sealing mode.

Optionally, in the above single-side overpressure protection structure, the structure further includes an adjusting gasket, the adjusting gasket is sleeved on the screw rod and is disposed between the positioning step and the nut, and a portion of the first corrugated membrane at the mounting hole is tightly pressed between the adjusting gasket and the nut in a sealing manner.

Optionally, in the above single-side overpressure protection structure, the screw is coaxially arranged with the filling liquid communication cavity.

Optionally, in the above single-side overvoltage protection structure, the cut-off device is a sealing ring.

The utility model provides an unilateral overvoltage protection structure sets up cutting device on the ejector pin device, and when first ripple diaphragm pressurized, first ripple diaphragm removes to filling liquid intercommunication chamber direction under the effect of external medium pressure, and the filling liquid in the first filling liquid intracavity flows to the direction in second filling liquid chamber along filling liquid intercommunication chamber, and the action of first ripple diaphragm can drive ejector pin device synchronous motion simultaneously, and ejector pin device drives the cutting device and removes. The pressure that first ripple diaphragm received is big more, the ejector pin device drives cutting device's displacement volume is big more, when first ripple diaphragm is in overpressure condition, cutting device's displacement volume guarantees that it can block and fill liquid intercommunication chamber, because fill liquid intercommunication chamber is truncated, make first fill liquid chamber and second fill liquid chamber disconnection intercommunication, the unable second that flows into through filling liquid intercommunication chamber of filling liquid in the first fill liquid intracavity fills the liquid chamber, the filling liquid volume in first fill liquid intracavity is unchangeable promptly, first ripple diaphragm both sides outside medium pressure reaches balance with first fill liquid intracavity fill liquid pressure, first ripple diaphragm no longer produces the deformation, thereby form guard action to first ripple diaphragm.

When the pressure of the external medium of the first corrugated diaphragm returns to normal, the first corrugated diaphragm returns to the original state under the action of elasticity, the cutting device opens the filling liquid communicating cavity, the first filling liquid cavity is communicated with the second filling liquid cavity, and the double-diaphragm differential pressure gauge works normally.

Unilateral overvoltage protection structure, overvoltage protection structure part make simply, saved the process step and the cost of mechanical numerical control processing, cut through cutting device and fill liquid intercommunication chamber, utilize and fill the liquid can not play the guard action by compressibility, the ripple diaphragm can not take place to damage because of the contact, does not occupy the instrument space simultaneously, is applicable to the bimembrane differential pressure gauge of all ranges.

A double-diaphragm differential pressure gauge comprises a single-side overvoltage protection structure, wherein the single-side overvoltage protection structure is the single-side overvoltage protection structure.

The utility model discloses a two diaphragm differential pressure meters owing to have above-mentioned unilateral overvoltage protection structure, consequently has all technological effects of above-mentioned unilateral overvoltage protection structure concurrently, and this paper is no longer repeated here.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a prior art method of forming a corrugated protective surface on a body opposite a corrugated diaphragm in a non-pressurized state;

FIG. 2 is a schematic view of a prior art method of forming a corrugated protective surface on a body opposite a corrugated diaphragm under pressure;

FIG. 3 is a schematic diagram of a prior art method of using an overvoltage protector;

FIG. 4 is a schematic view of the whole structure of the double-diaphragm differential pressure gauge of the present invention;

FIG. 5 is a sectional view of the transmission shaft of the double-diaphragm differential pressure gauge of the present invention;

fig. 6 is a schematic structural view of the single-side overvoltage protection structure of the present invention in a non-pressure state;

fig. 7 is the structural schematic diagram of the unilateral overvoltage protection structure of the present invention under the state of pressure.

The meaning of the various reference numerals in figures 1 to 7 is as follows:

the device comprises a diaphragm instrument 1, an overvoltage protector 2, a main body 100, an inner sunken groove 101, a corrugated diaphragm 200, a first corrugated diaphragm 201, a second corrugated diaphragm 202, a push rod device 300, a screw 301, a cutting device 302, an adjusting gasket 303, a nut 304, a corrugated protection surface 400, a transmission shaft 500 and a transmission shaft force arm 501.

Detailed Description

The core of the utility model is to provide a unilateral overvoltage protection structure, which reduces the requirement on the machining process of the double-diaphragm differential pressure gauge on the premise of ensuring the unilateral overvoltage function and simultaneously avoids the problems caused by using an overvoltage protector;

another core of the present invention is to provide a double-diaphragm differential pressure gauge having the above single-side overvoltage protection structure.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 4-7, the present invention discloses a single-side overvoltage protection structure, which comprises a main body 100, a corrugated diaphragm 200, a push rod device 300 and a cutting device 302.

The corrugated diaphragm 200 comprises a first corrugated diaphragm 201 and a second corrugated diaphragm 202 which are hermetically arranged on two sides of the main body 100, a first filling liquid cavity is formed between the first corrugated diaphragm 201 and the main body 100, a second filling liquid cavity is formed between the second corrugated diaphragm 202 and the main body 100, and a filling liquid communicating cavity which communicates the first filling liquid cavity with the second filling liquid cavity is formed in the main body 100, so that filling liquids in the first filling liquid cavity and the second filling liquid cavity can flow through the filling liquid communicating cavity. The corrugated membrane 200 is a conventional corrugated membrane in the prior art, and the detailed structure thereof is not described herein.

The push rod device 300 is used for pushing the transmission shaft 500 of the double-diaphragm differential pressure gauge to rotate. Specifically, a transmission shaft force arm 501 is vertically and fixedly connected to the transmission shaft 500, one end of the push rod device 300 is hinged to the transmission shaft force arm 501, and the other end of the push rod device 300 is connected to the first corrugated diaphragm 201, when the first corrugated diaphragm 201 moves, the push rod device 300 moves along with the first corrugated diaphragm 201 to generate linear displacement, and drives the transmission shaft force arm 501 to rotate, so as to drive the transmission shaft 500 to rotate, and convert the linear displacement generated by the push rod device 300 into the rotary displacement of the transmission shaft 500.

The cutting device 302 is provided on the jack device 300, and moves in accordance with the operation of the first bellows membrane 201. The shut-off device 302 may be similar to a valve cartridge structure, and in particular, the shut-off device 302 may be a sealing ring. The communicating state of the filling liquid communicating chamber is changed by the displacement thereof, and the ejector means 300 drives the cutoff means 302 to intercept the filling liquid communicating chamber when the first bellows membrane 201 is over-pressurized.

The utility model provides an unilateral overvoltage protection structure sets up cutting device 302 on ejector pin device 300, and when first ripple diaphragm 201 pressurized, first ripple diaphragm 201 removes to filling liquid intercommunication chamber direction under the effect of external medium pressure, and the filling liquid in the first filling liquid intracavity flows to the direction that the liquid chamber was filled to the second along filling liquid intercommunication chamber, and the action of first ripple diaphragm 201 can drive ejector pin device 300 synchronous motion simultaneously, and ejector pin device 300 drives cutting device 302 and removes. The larger the pressure that first corrugated diaphragm 201 received, the larger the displacement volume that ejector pin device 300 drove cutting device 302 is, when first corrugated diaphragm 201 was in overpressure condition, cutting device 302's displacement volume was guaranteed it and is able to be intercepted filling liquid intercommunication chamber, because filling liquid intercommunication chamber was intercepted, make first filling liquid chamber and second filling liquid chamber disconnection intercommunication, the unable second filling liquid chamber that flows into through filling liquid intercommunication chamber of filling liquid in the first filling liquid chamber, filling liquid volume in the first filling liquid intracavity is unchangeable promptly, first corrugated diaphragm 201 both sides outside medium pressure reaches the equilibrium with first filling liquid intracavity filling liquid pressure, first corrugated diaphragm 201 no longer produces the deformation, thereby form guard action to first corrugated diaphragm 201.

When the pressure of the medium outside the first corrugated diaphragm 201 returns to normal, the first corrugated diaphragm 201 returns to the original state under the elastic action, the cutting device 302 opens the filling liquid communicating cavity, the first filling liquid communicating cavity is communicated with the second filling liquid communicating cavity, and the double-diaphragm differential pressure gauge works normally.

Unilateral overvoltage protection structure, overvoltage protection structure part manufacturing is simple, has saved the process step and the cost of mechanical numerical control processing, cuts through cutting device 302 and fills liquid intercommunication chamber, utilizes filling liquid can not play the guard action by compressibility, the damage can not take place because of the contact for the ripple diaphragm, does not occupy the instrument space simultaneously, is applicable to the double-diaphragm differential pressure gauge of all ranges.

The existing linear measurement of the double-diaphragm differential pressure gauge is mainly performed by the first corrugated diaphragm 201, if the first corrugated diaphragm 201 is plastically deformed, the double-diaphragm differential pressure gauge is permanently damaged, and the second corrugated diaphragm 202 mainly plays a role in pressure conduction and medium isolation. Therefore, the present invention provides an unilateral overvoltage protection structure to protect the first corrugated diaphragm 201 as an example, and similarly, the second corrugated diaphragm 202 can also be protected from overvoltage damage by the unilateral overvoltage protection structure disclosed in the above embodiment.

As shown in fig. 6-7, in order to facilitate the realization that when the first corrugated diaphragm 201 is over-pressurized, the cutting device 302 can cut off the communicating cavity of the filling liquid, thereby avoiding the occurrence of the failure of cutting off, in the embodiment of the present invention, the main body 100 is provided with the inner sunken groove 101, and the inner sunken groove 101 is disposed on a side surface close to the first corrugated diaphragm 201 and is used for communicating the first filling liquid cavity and the communicating cavity of the filling liquid. The cutting device 302 is located in the area covered by the inner sunken groove 101, and may be located outside the inner sunken groove 101, and may enter the area covered by the inner sunken groove 101 along with the action of the push rod device 300 after the first corrugated diaphragm 201 is pressed.

When the double-diaphragm differential pressure gauge is not under pressure, the cutting device 302 has a preset clearance H with the bottom of the inner sunken groove 101. The preset gap H can be calculated according to the bearing pressure value and the elastic coefficient of the first corrugated diaphragm 201, and different pressure values correspond to different preset gaps H. The maximum value of the preset clearance H is a calculated displacement amount of the maximum bearable pressure value at which the first corrugated diaphragm 201 does not undergo plastic deformation.

As shown in fig. 7, when the first corrugated diaphragm 201 is over-pressurized, the ejector rod device 300 drives the cutting device 302 to move, when the displacement of the first corrugated diaphragm 201 reaches the preset gap H, the cutting device 302 moves to abut against the bottom of the inner sink groove 101, the first filling liquid cavity and the filling liquid communicating cavity are disconnected and communicated, the volume of the first filling liquid cavity is not changed, and at this time, the external medium pressure and the liquid pressure of the first filling liquid cavity reach a balance, so that the function of protecting the first corrugated diaphragm 201 is realized. When the pressure of the medium outside the first corrugated diaphragm 201 returns to normal, as shown in fig. 6, the first corrugated diaphragm 201 returns to its original shape under the elastic action, the cutting device 302 moves along with the first corrugated diaphragm 201 in the direction away from the filling liquid communicating cavity, the cutting device 302 is disconnected from the bottom of the inner submerged groove 101, the first filling liquid communicating cavity is communicated with the filling liquid communicating cavity, and the double-diaphragm differential pressure gauge works normally.

In this embodiment, by designing the inner sunken groove 101, when the first corrugated membrane 201 is over-pressurized, the cutting device 302 moves to abut against the bottom of the inner sunken groove 101, and under the supporting effect of the bottom of the inner sunken groove 101, the cutting device 302 can be ensured to effectively block the communicating cavity of the filling liquid, thereby avoiding the blocking failure.

As shown in fig. 6-7, in an embodiment of the present invention, in order to facilitate positioning and installing the cutting device 302, a positioning step is disposed on the ejector rod device 300, the cutting device 302 is sleeved on the ejector rod device 300, and one side of the cutting device is abutted against the positioning step. When the first corrugated diaphragm 201 is in an overpressure state, the cutting device 302 moves to abut against the bottom of the inner sunken groove 101 and abuts against the bottom of the inner sunken groove 101 under the action of pressure, and due to the fact that one side of the cutting device 302 abuts against the positioning step, under the limiting action of the positioning step, the cutting device 302 can be effectively prevented from sliding along the ejector rod device 300 under the action of the pressure of the bottom of the inner sunken groove 101, and accordingly cutting failure is caused.

As shown in fig. 6-7, in an embodiment of the present invention, the first corrugated diaphragm 201 has a mounting hole, and one end of the push rod device 300 extends into the mounting hole and is hinged to the transmission shaft force arm 501 of the double-diaphragm differential pressure gauge to drive the transmission shaft 500 to rotate, and the side wall of the mounting hole is connected to the push rod device 300 in a sealing manner to prevent the first filling liquid cavity from leaking.

In order to facilitate the assembly between the mandrel device 300 and the first corrugated membrane 201, as shown in fig. 6 to 7, the mandrel device 300 of the present embodiment is modified, and the mandrel device 300 of the present embodiment includes a screw 301 and a nut 304, and one end of the screw 301 passes through the mounting hole of the first corrugated membrane 201, extends into the filling liquid communicating chamber, and is coaxially arranged with the filling liquid communicating chamber. The screw 301 is in transmission connection with a transmission shaft 500 of the double-diaphragm differential pressure gauge, the positioning step is arranged on the screw 301, the screw 301 is in threaded fit with the nut 304, and the part of the first corrugated diaphragm 201 at the mounting hole is tightly pressed on the positioning step in a sealing mode. The utility model discloses location step on accessible nut and the screw rod 301 presss from both sides tightly first ripple diaphragm 201 in the centre, has not only realized being connected of ejector pin device 300 and first ripple diaphragm 201, still more conveniently realizes the sealed to the mounting hole.

It can be understood by those skilled in the art that the preset gap H between the cut-off device 302 and the bottom of the inner sinker 101 is related to the overvoltage protection value of the dual-diaphragm differential pressure gauge, and therefore how to adjust the preset gap H enables the dual-diaphragm differential pressure gauge to set the overvoltage protection value according to the application scenario is an urgent problem to be solved by those skilled in the art.

In order to solve the above technical problem, in this embodiment, the stem bar device 300 may further include an adjusting washer 303, the adjusting washer 303 is sleeved on the screw 301 and disposed between the positioning step and the nut 304, and a portion of the first bellow 201 at the mounting hole is tightly sealed and pressed between the adjusting washer 303 and the nut 304. The utility model discloses can adjust through the quantity of increase and decrease adjusting shim 303 and predetermine clearance H, predetermine clearance H different, the excessive pressure value that the first ripple diaphragm 201 that corresponds can bear is different, and the overvoltage protection value of two diaphragm differential gauges is different promptly.

In an embodiment of the present invention, the adjusting shim 303 and the first corrugated diaphragm 201 may also be an integral structure, and the screw 301 passes through the hole of the adjusting shim 303 and the nut 304 to be screwed, and seals and compresses the portion of the first corrugated diaphragm 201 at the hole of the adjusting shim on the positioning step.

The embodiment of the utility model provides a still disclose a two diaphragm differential pressure meters, including the unilateral overvoltage protection structure as above embodiment is disclosed, consequently have all technological effects of above-mentioned unilateral overvoltage protection structure concurrently, this text is no longer repeated here.

Those matters not described in detail in this specification are well known in the art and will not be described in detail herein.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. An element defined by the phrase "comprising a component of ' 8230 ' \8230; ' does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A single-sided overvoltage protection structure for a dual diaphragm differential pressure gauge, comprising:

a main body (100);

the corrugated membrane (200) comprises a first corrugated membrane (201) and a second corrugated membrane (202) which are respectively arranged on two sides of the main body (100) in a sealing mode, a first filling liquid cavity is formed between the first corrugated membrane (201) and the main body (100), a second filling liquid cavity is formed between the second corrugated membrane (202) and the main body (100), and a filling liquid communication cavity for communicating the first filling liquid cavity with the second filling liquid cavity is formed in the main body (100);

the push rod device (300) is used for pushing a transmission shaft (500) of the double-diaphragm differential pressure gauge to rotate and is connected with the first corrugated diaphragm (201) to act with the first corrugated diaphragm (201);

the cutting device (302) is arranged on the ejector rod device (300), and when the first corrugated membrane (201) is in overpressure, the ejector rod device (300) drives the cutting device (302) to cut off the filling liquid communicating cavity.

2. The single-side overpressure protection architecture of claim 1, wherein said main body (100) is provided with an inner sunken groove (101), said inner sunken groove (101) is disposed on a side surface close to said first corrugated diaphragm (201) and is used for communicating said first filling liquid chamber and said filling liquid communicating chamber;

and when the cutting device (302) moves along with the ejector rod device (300) to abut against the bottom of the inner sunken groove (101), the filling liquid communication cavity is cut off.

3. The single-sided overvoltage protection structure according to claim 2, wherein the cut-off device (302) is located in an area covered by the inner sunken tank (101), and when the double-diaphragm differential pressure gauge is not under pressure, the cut-off device (302) has a preset gap H with a bottom of the inner sunken tank (101).

4. The single-sided overvoltage protection structure according to claim 1, wherein the ejector rod device (300) is provided with a positioning step, the cut-off device (302) is sleeved on the ejector rod device (300), and one side of the cut-off device abuts against the positioning step.

5. The unilateral overvoltage protection structure according to claim 4, wherein the first corrugated diaphragm (201) is provided with a mounting hole, one end of the push rod device (300) extends into the mounting hole and is in transmission connection with a transmission shaft (500) of the double-diaphragm differential pressure gauge, and the side wall of the mounting hole is in sealing connection with the push rod device (300).

6. The single-sided overvoltage protection structure according to claim 5, wherein said ejector means (300) comprises a screw (301) and a nut (304);

one end of the screw rod (301) penetrates through the mounting hole of the first corrugated diaphragm (201), extends into the filling liquid communicating cavity, and is in transmission connection with a transmission shaft (500) of the double-diaphragm differential pressure gauge, the positioning step is arranged on the screw rod (301), the screw rod (301) is in threaded fit with the nut (304), and the first corrugated diaphragm (201) is tightly pressed on the positioning step in a sealing mode at the part of the mounting hole.

7. The single-side overpressure protection structure of claim 6, further comprising an adjusting gasket (303), wherein the adjusting gasket (303) is sleeved on the screw rod (301) and is disposed between the positioning step and the nut (304), and a portion of the first corrugated diaphragm (201) at the mounting hole is tightly and hermetically compressed between the adjusting gasket (303) and the nut (304).

8. The single-sided overpressure protection arrangement of claim 6, wherein said screw (301) is arranged coaxially with said filling liquid communication chamber.

9. Single-sided overvoltage protection arrangement according to any of claims 1-8, wherein said shut-off device (302) is a sealing ring.

10. A double diaphragm differential pressure gauge comprising a single-sided overvoltage protection structure, wherein the single-sided overvoltage protection structure is a single-sided overvoltage protection structure as claimed in any one of claims 1 to 9.

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