CN212131416U

CN212131416U - Pressure adjusting mechanism for on-line checking of density relay

Info

Publication number: CN212131416U
Application number: CN202020685940.XU
Authority: CN
Inventors: 常敏; 黄小泵; 夏铁新; 郭正操; 金海勇
Original assignee: Shanghai Roye Electric Science and Technology Co Ltd
Current assignee: Shanghai Roye Electric Science and Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-12-11
Anticipated expiration: 2030-04-29

Abstract

The application provides a pressure adjusting mechanism for online checking of a density relay, which comprises a valve and a pressure adjusting mechanism body, wherein the pressure adjusting mechanism body comprises a first cavity and a telescopic second cavity which are communicated, and a first interface connected with the density relay and a second interface connected with the valve are arranged on the first cavity; the air inlet of the valve is arranged at a second interface in the first cavity, and the air outlet of the valve is communicated with the first cavity; the driving component drives the middle shaft to move in the first cavity and the second cavity so as to open or close the valve; meanwhile, the moving of the middle shaft drives the volume of the second cavity to change, so that the pressure of the density relay is adjusted to rise and fall, and the online verification of the density relay is realized. The gas density monitoring device has the advantages that the opening and closing of the valve are controlled through the pressure adjusting mechanism body, the density relay is communicated with the electrical equipment on a gas path in a working state, and the gas density of the electrical equipment is monitored safely; when the density relay is checked, the density relay is separated from the electrical equipment on the air path, and the safe operation of the electrical equipment is not influenced.

Description

Pressure adjusting mechanism for on-line checking of density relay

Technical Field

The utility model relates to an electric power tech field, concretely relates to use pressure adjustment mechanism of density relay on-line check-up usefulness on high pressure, middling pressure electrical equipment.

Background

The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties.

With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and therefore, the application of the gas density monitoring system (gas density relay) is developed vigorously. Whereas current gas density monitoring systems (gas density relays) are basically: 1) the remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the work efficiency is greatly improved, and the cost is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pressure adjustment mechanism that density relay that uses on high pressure, middling pressure electrical equipment was used for when monitoring the gas density of the electrical equipment of gas insulation or arc extinguishing, still accomplish the online check-up to gas density relay, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a pressure regulating mechanism for on-line verification of a density relay comprises: a valve and pressure adjustment mechanism body;

the pressure adjusting mechanism body comprises a first cavity with an opening at one end and a telescopic second cavity, a first interface communicated with a gas path of the gas density relay and a second interface connected with electrical equipment are arranged on the side wall of the first cavity, and the relative positions of the first interface and the second interface are arranged in a staggered manner; a middle shaft is arranged in the first cavity, and one end of the middle shaft extends out of the first cavity from the opening and then is connected with the driving part; the second cavity is sleeved on a section of the middle shaft extending out of the first cavity, one end of the second cavity is connected to the opening in a sealing mode, the second cavity is communicated with the first cavity through the opening, and the other end of the second cavity is connected with the driving end of the driving part in a sealing mode;

the valve is arranged at a second interface in the first cavity and comprises a valve body, the valve body is of a through structure, and two ends of the through structure are provided with an air inlet connected with the second interface and an air outlet communicated with the first cavity; a valve core used for plugging the air outlet is arranged in the through structure in a sliding mode, one end of the valve core penetrates through the air outlet and then extends into the first cavity and is arranged opposite to the center shaft, the other end of the valve core is fixedly connected with one end of an elastic piece, and the other end of the elastic piece is fixedly connected with the air inlet;

the driving part drives the middle shaft to move in the first cavity and the second cavity so as to control the valve core to move in the valve body along the directions of the air inlet and the air outlet; the gas pressure in the first cavity and the second cavity changes along with the position change of the middle shaft.

Preferably, the second cavity is a bellows or a balloon.

Preferably, the first cavity and the second cavity are of an integrated design.

Preferably, the second cavity is sealed within a cavity or housing.

More preferably, the drive member is provided within the cavity or housing.

Preferably, the spool has a first position and a second position that move in an axial direction of the valve body; when the valve core is positioned at the first position, the air outlet is blocked, so that an air passage between the first interface and the second interface of the pressure adjusting mechanism body is cut off; and when the valve core is positioned at the second position, the air inlet is communicated with the air outlet, so that an air passage between the first interface and the second interface of the pressure regulating mechanism body is communicated.

Preferably, the valve core comprises a sealing ball and a push rod, one end of the push rod penetrates through the air outlet and then extends into the first cavity, and a gap is reserved between the part of the push rod penetrating through the air outlet and the inner wall of the air outlet; the other end of the ejector rod is fixedly connected with one end of the sealing ball, and the other end of the sealing ball is fixedly connected with the elastic piece.

More preferably, the ejector rod, the sealing ball, the elastic element and the middle shaft are positioned on the same axis.

More preferably, the ejector pin is T type, the tip of the long section of ejector pin runs through extend to in the first cavity behind the gas outlet, the short section one side that the back of long section of ejector pin with the one end fixed connection of ball sealer.

Further, the short section is a sealing disc and used for plugging the air outlet.

Furthermore, the short section of the ejector rod is used for plugging the working surface of the air outlet and is also provided with a gasket made of elastic rubber.

More preferably, the inner diameter of the air outlet decreases progressively from the inside of the valve body to the first cavity along the axis of the ejector rod, and the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the air outlet to block the air outlet of the valve.

Furthermore, a gasket made of elastic rubber is further arranged on the inner wall of the valve body where the gas outlet is located, a sealing hole coaxial with the gas outlet is formed in the middle of the gasket, and the inner diameter of the sealing hole is smaller than the diameter of the sealing ball.

Preferably, the elastic member is a return spring.

Preferably, a fixing member is arranged at the air inlet of the valve, the elastic member is clamped between the valve core and the fixing member, and a through hole for gas to pass through is formed in the fixing member.

Preferably, a fixed guide part is arranged in the first cavity, the fixed guide part is perpendicular to the axial direction of the first cavity, and a guide hole for the middle shaft to pass through is formed in the fixed guide part.

More preferably, the fixed guide is a partition plate, the partition plate divides the first cavity and the second cavity which are connected in a sealing manner into two air chambers, at least one through hole is formed in the partition plate, and the two air chambers are communicated through the through hole.

Preferably, the driving component comprises one of a magnetic force mechanism, a motor, an electric middle shaft motor, a stepping motor, a reciprocating mechanism, a carnot cycle mechanism, an air compressor, a deflation valve, a pressure-generating pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust-generating mechanism, an electric heating thrust-generating mechanism and a chemical reaction thrust-generating mechanism.

Preferably, a connecting pipe for connecting the gas density relay is further arranged on the first interface of the pressure adjusting mechanism body.

Preferably, the pressure adjusting mechanism further includes: and the second interface of the pressure adjusting mechanism body is communicated with the air passage of the electrical equipment through the multi-way joint.

Preferably, a third interface connected with the gas density detection sensor is further arranged on the first cavity of the pressure adjusting mechanism body.

More preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, the gas density detection sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, the gas density detection sensor adopts a density detection sensor of quartz tuning fork technology.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has:

the application provides a pressure regulating mechanism for online checking of a density relay, which comprises a pressure regulating mechanism body and a valve; the pressure adjusting mechanism body comprises a first cavity and a telescopic second cavity which are hermetically connected, a first interface and a second interface are arranged on the first cavity, and an air passage of the pressure adjusting mechanism body is communicated with an air passage of the gas density relay through the first interface and is connected with the electrical equipment through the second interface; the air inlet of the valve is arranged at a second interface in the first cavity, and the air outlet of the valve is communicated with the first cavity; the driving part drives the middle shaft to move in the first cavity and the second cavity so as to open the valve and further communicate the gas circuit of the electrical equipment and the gas density relay, or close the valve and further isolate the gas circuit of the electrical equipment and the gas density relay; meanwhile, the volume of the second cavity changes according to the position change of the middle shaft, so that the pressure rise and fall of the gas density relay are adjusted, the gas density relay is enabled to give an alarm and/or lock a contact signal action, and the online verification of the gas density relay is realized. The gas density relay is communicated with the electrical equipment on a gas path in a working state through the switch of the pressure regulating mechanism body control valve, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably; under the check state, the gas density relay is not communicated with the electrical equipment on the gas path, and the safe operation of the electrical equipment cannot be influenced by the online check of the gas density relay.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

FIG. 1 is a structural diagram illustrating an operating state of a pressure adjustment mechanism according to a first embodiment;

FIG. 2 is a structural diagram illustrating a checking state of the pressure adjustment mechanism according to the first embodiment;

FIG. 3 is a structural diagram illustrating an operating state of a pressure adjustment mechanism according to a second embodiment;

fig. 4 is a structural diagram of a verification state of the pressure adjustment mechanism of the third embodiment.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

as shown in fig. 1 to 2, the pressure adjusting mechanism for the online verification of the density relay comprises a valve 4 and a pressure adjusting mechanism body 5, wherein the valve 4 is embedded in the pressure adjusting mechanism body 5. The valve 4 is closed or opened under the control of the pressure adjusting mechanism body 5, and meanwhile, the pressure adjusting mechanism body 5 adjusts the pressure rise and fall of a gas density relay communicated with a gas path of the pressure adjusting mechanism body, so that the gas density relay generates an alarm and/or unlocks a contact signal action.

Fig. 1 is a schematic structural diagram of a working state of a pressure adjusting mechanism for online verification of a density relay, and fig. 2 is a schematic structural diagram of a verification state of the pressure adjusting mechanism for online verification of the density relay.

Specifically, the pressure adjustment mechanism body 5 includes: the gas density relay comprises a first cavity 501 with an opening at one end and a telescopic second cavity 503, wherein a first interface 506 communicated with a gas path of the gas density relay and a second interface 507 connected with electrical equipment are arranged on the side wall of the first cavity 501, and the relative positions of the first interface 506 and the second interface 507 are staggered. A middle shaft 5S is arranged in the first cavity 501, and one end of the middle shaft 5S extends out of the first cavity 501 from the opening and is connected with the driving part 505; the second cavity 503 is sleeved on a section of the middle shaft 5S extending out of the first cavity 501, one end of the second cavity 503 is connected to the opening in a sealing manner, the second cavity 503 is communicated with the first cavity 501 through the opening, and the other end of the second cavity 503 is connected to the driving end of the driving part 505 in a sealing manner. In this embodiment, the driving component 505 may be one of a magnetic force mechanism, a motor, an electric center shaft motor, a stepping motor, a reciprocating mechanism, a carnot cycle mechanism, an air compressor, a deflation valve, a pressure-generating pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust-generating mechanism, an electric heating thrust-generating mechanism, and a chemical reaction thrust-generating mechanism. The heating produces the thrust mechanism, for example, heats the bimetallic strip, and then produces the thrust mechanism. The first cavity 501 and the second cavity 503 are designed integrally, the second cavity 503 is a corrugated pipe and has the properties of being capable of being stretched, extended and shortened by extrusion, and the second cavity 503 is driven by the middle shaft 5S to perform telescopic motion, so that the gas pressure of a gas density relay communicated with the pressure adjusting mechanism body 5 is changed.

A fixed guide part 5C is arranged in the first cavity 501, the fixed guide part 5C is perpendicular to the axial direction of the first cavity 501, and a guide hole for the middle shaft 5S to pass through is formed in the fixed guide part 5C. The fixed guide part 5C is mainly used for guiding the middle shaft 5S, so that the middle shaft 5S can be stable and reliable in movement. In this embodiment, the fixing guide 5C is a partition plate, the partition plate separates the first cavity 501 and the second cavity 503 which are connected in a sealing manner into two air chambers, and the partition plate is provided with at least one through hole which communicates the two air chambers.

In a preferred embodiment, a third interface 509 connected with a gas density detection sensor is further disposed on a side wall of the first cavity 501. The gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, the gas density detection sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, the gas density detection sensor adopts a density detection sensor of quartz tuning fork technology. The gas density detection sensor is used for acquiring pressure values and temperature values and/or gas density values in the first cavity 501 and the second cavity 503.

The valve 4 is arranged at the second port 507 in the first cavity 501, the valve 4 comprises a valve body, the valve body is of a through structure, and an air inlet 4B connected with the second port 507 and an air outlet 4A communicated with the first cavity 501 are arranged at two ends of the through structure; a valve core used for plugging the air outlet 4A is slidably arranged in the through structure, one end of the valve core extends into the first cavity 501 after penetrating through the air outlet 4A, and is arranged opposite to the middle shaft 5S. And a gap is reserved between the part of the valve core penetrating through the air outlet 4A and the inner wall of the air outlet 4A.

The other end of the valve core is fixedly connected with one end of an elastic member 401 (in this embodiment, a return spring), and the other end of the elastic member 401 is fixedly connected to the air inlet 4B. The driving component 505 drives the central shaft 5S to move in the first cavity 501 and the second cavity 503, so as to control the valve core to move in the valve body along the directions of the air inlet 4B and the air outlet 4A, thereby realizing the opening or closing of the valve.

In this embodiment, the valve core includes a sealing ball 402 and a T-shaped plunger 403, an end of a long section of the plunger 403 extends into the first cavity 501 after penetrating through the air outlet 4A, and one side of a short section of the plunger 403, which is back to the long section, is fixedly connected to one end of the sealing ball 402. The ejector rod 403, the sealing ball 402, the elastic part 401 and the middle shaft 5S are positioned on the same axis. Wherein, the short section can be a sealing disc, and the area of the sealing disc is larger than the air outlet 4A and is used for plugging the air outlet 4A. The reciprocating motion of the central shaft 5S causes intermittent collision between the sealing disc and the end surface of the air outlet 4A facing the inside of the valve body, and the working surface of the sealing disc for sealing the air outlet 4A may be locally damaged, i.e., the sealing performance may be reduced. In a preferred embodiment, can be used for setting up rubber's gasket on the working face of shutoff gas outlet 4A at sealed dish, when sealed dish take place discontinuous reciprocating motion and with gas outlet 4A before the inside end face contact of valve body, the gasket on the sealed dish takes place flexible contact with the inner wall of valve body earlier, make the trend of sealed dish right removal slow down relatively, until the working face of sealed dish and gas outlet 4A contact back, certain extrusion is formed to sealed dish under the effect of the restoring force of elastic component 401 to ball 402, the gasket is through deformation with sealed dish fastening on the inner wall of valve body, and then strengthen sealed dish to gas outlet 4A's sealing performance.

As shown in fig. 1, in a normal working state, the central axis 5S of the pressure adjustment mechanism body 5 pushes the push rod 403 to move in the cavity of the valve body toward the air inlet 4B, the elastic member 401 is in a compressed state, the short section of the push rod 403 is separated from the inner wall of the valve body, the air inlet 4B of the valve 4 is communicated with the air outlet 4A, that is, the valve 4 is in an open state. As shown in fig. 2, during verification, the short section of the push rod 403 is attached to the inner wall of the valve body in a sealing manner to block the air outlet 4A of the valve 4, and the air inlet 4B and the air outlet 4A are sealed, that is, the valve 4 is in a closed state.

The working principle of the pressure adjusting mechanism for the on-line verification of the density relay is as follows:

in a working state, the central shaft 5S of the pressure adjusting mechanism body 5 pushes the sealing ball 402 and the ejector rod 403 to move in the cavity of the valve body towards the air inlet 4B, the elastic member 401 is in a compressed state, the outer edge surface of the short section of the ejector rod 403 is separated from the inner wall of the valve body, the air inlet 4B of the valve 4 is communicated with the air outlet 4A, namely, the valve 4 is in an open state, the first cavity 501 of the pressure adjusting mechanism body 5 is communicated with the gas density relay and the gas path of the electrical equipment, so that the gas density relay is communicated with the electrical equipment on the gas path in the working state, and the gas density relay monitors the gas density of the electrical equipment safely and reliably, and the electrical equipment works.

When the gas density relay needs to be verified, the driving part 505 drives the middle shaft 5S to move to the right (in the direction away from the valve 4), and the second cavity 503 is stretched, as shown in fig. 2. And in the movement, the central shaft 5S is far away from the push rod 403 of the valve 4, the elastic member 401 is restored to the stretching state, the sealing ball 402 moves rightwards under the action of the elastic member 401, the short section of the push rod 403 is in sealing fit with the inner wall of the valve body under the extrusion of the sealing ball 402, and the air outlet 4A of the valve 4 is sealed, namely, the air passage between the air inlet 4B of the valve 4 and the first interface 506 of the pressure regulating mechanism body 5 is blocked.

Along with the movement of the central shaft 5S, the volume of the second cavity 503 is increased, and the pressure of the gas density relay can be adjusted, so that the gas pressure of the gas density relay is slowly reduced, the gas density relay is subjected to contact action, and the checking work of a contact signal action value of the gas density relay is realized. After all the contact action values of the alarm and/or locking signals of the gas density relay are detected, the driving component 505 drives the middle shaft 5S of the pressure adjusting mechanism body 5 to move towards the left direction (namely towards the valve 4), the volume of the second cavity 503 is reduced, the pressure of the gas density relay can be adjusted, the gas pressure of the gas density relay slowly rises, the contact of the gas density relay is reset, the contact signal return value of the gas density relay is detected, and the verification work of the contact signal return value of the gas density relay is completed. Can so check repeatedly many times (for example 2 ~ 3 times), then calculate its average value, just so conveniently accomplish the online check-up work of gas density relay, simultaneously when online check-up gas density relay, gas density relay on the gas way with electrical equipment not communicate to can not influence electrical equipment's safe operation.

After all the contact signal verification work is finished, the central shaft 5S of the pressure adjusting mechanism body 5 moves leftwards under the action of the driving part 505, acting force is applied to the ejector rod 403 of the valve 4, the valve 4 is opened, and the gas circuits of the electrical equipment and the gas density relay are communicated with each other. As shown in fig. 1: at this time, the valve 4 is opened, the first interface 506 is communicated with the second interface 507 on the gas path, the gas density relay is communicated with the electrical equipment on the gas path, and the gas density relay normally monitors the gas density of a gas chamber of the electrical equipment and can monitor the gas density of the electrical equipment on line. The density monitoring circuit of the gas density relay works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably.

Example two:

fig. 3 is a structural diagram illustrating an operating state of the pressure adjustment mechanism according to the second embodiment. As shown in fig. 3, the present embodiment is different from the first embodiment in that:

in this embodiment, the second cavity 503 is a balloon. The second cavity 503 is sealed in a cavity 512, and the driving member 505 is sealed in the cavity 512.

The fixing guide 5C may be provided with a plurality of through holes, so that the gas flow between the two air chambers partitioned by the fixing guide 5C is smoother. The working principle or working process is the same as the embodiment, and the description is not repeated here.

Example three:

fig. 4 is a structural diagram of a verification state of the pressure adjustment mechanism of the third embodiment. As shown in fig. 4, the present embodiment is different from the first embodiment in that:

the inner diameter of the air outlet 4A of the valve 4 decreases progressively from the inside of the valve body to the first cavity 501 along the axis of the ejector rod 403, and the outer edge surface of the sealing ball 402 is in sealing fit with the inclined surface of the air outlet 4A to block the air outlet 4A of the valve 4. The inclined plane of the air outlet 4A is provided to facilitate the improvement of the sealing property.

In a preferred embodiment, a gasket 404 made of elastic rubber is further arranged on the inner wall of the valve body where the air outlet 4B is located, a sealing hole coaxial with the air outlet 4A is formed in the middle of the gasket 404, and the inner diameter of the sealing hole is smaller than the diameter of the sealing ball 402. That is to say, the seal ball 402 takes place discontinuous reciprocating motion and before the terminal surface contact towards the valve body inside with gas outlet 4A, the seal ball 402 takes place flexible contact with gasket 404 earlier, make the trend that the seal ball 402 moved right slow down relatively, until the working face of seal ball 402 and gas outlet 4A contact the back, the internal diameter of seal ball 402 is greater than the internal diameter of seal hole, make the outer wall of seal ball 402 can form certain extrusion to the inner wall of seal hole, gasket 404 is through deformation with seal ball 402 centre gripping fastening, and then strengthen the sealing performance of seal ball 402 to gas outlet 4A.

The valve may be a check valve of various forms. And the valve core comprises a sealing ball and an ejector rod, one end of the ejector rod can extend into the first cavity without penetrating through the air outlet, and the middle shaft 5S extends into the air outlet of the valve body. The sealing ball and the ejector rod can be designed integrally.

In summary, the gas density relay is communicated with the electrical equipment on a gas path in a working state by controlling the opening and closing of the valve through the pressure regulating mechanism, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably; under the check state, the gas density relay is not communicated with the electrical equipment on the gas path, and the safe operation of the electrical equipment cannot be influenced by the online check of the gas density relay.

The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are intended to be within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims

1. The utility model provides a pressure adjustment mechanism that density relay on-line check used which characterized in that: comprises a valve and a pressure regulating mechanism body;

2. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the second cavity is a bellows or an air bag.

3. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the first cavity and the second cavity are designed integrally.

4. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the second cavity is sealed within a cavity or housing.

5. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the valve core is provided with a first position and a second position which move along the axial direction of the valve body; when the valve core is positioned at the first position, the air outlet is blocked, so that an air passage between the first interface and the second interface of the pressure adjusting mechanism body is cut off; and when the valve core is positioned at the second position, the air inlet is communicated with the air outlet, so that an air passage between the first interface and the second interface of the pressure regulating mechanism body is communicated.

6. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the valve core comprises a sealing ball and an ejector rod, one end of the ejector rod penetrates through the air outlet and then extends into the first cavity, and a gap is reserved between the part of the ejector rod penetrating through the air outlet and the inner wall of the air outlet; the other end of the ejector rod is fixedly connected with one end of the sealing ball, and the other end of the sealing ball is fixedly connected with the elastic piece.

7. The pressure regulating mechanism for the density relay online verification according to claim 6, characterized in that: the ejector rod, the sealing ball, the elastic piece and the middle shaft are positioned on the same axis.

8. The pressure regulating mechanism for the density relay online verification according to claim 6, characterized in that: the ejector rod is T-shaped, the end part of the long section of the ejector rod penetrates through the gas outlet and then extends into the first cavity, and one side, back to the long section, of the short section of the ejector rod is fixedly connected with one end of the sealing ball.

9. The pressure regulating mechanism for the density relay online verification according to claim 8, characterized in that: the short section of the ejector rod is used for plugging the working surface of the air outlet and is also provided with a gasket made of elastic rubber.

10. The pressure regulating mechanism for the density relay online verification according to claim 6, characterized in that: the inner diameter of the gas outlet decreases progressively from the inside of the valve body to the first cavity along the axis of the ejector rod, and the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the gas outlet to block the gas outlet of the valve.

11. The pressure regulating mechanism for the density relay online verification according to claim 10, wherein: the inner wall of the valve body where the gas outlet is located is further provided with a gasket made of elastic rubber, the middle of the gasket is provided with a sealing hole coaxial with the gas outlet, and the inner diameter of the sealing hole is smaller than the diameter of the sealing ball.

12. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the driving part comprises one of a magnetic force mechanism, a motor, an electric push rod motor, a stepping motor, a reciprocating motion mechanism, a Carnot cycle mechanism, an air compressor, a vent valve, a pressure making pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism and a chemical reaction thrust generation mechanism.

13. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the elastic piece is a return spring.

14. The pressure regulating mechanism for the density relay online verification according to claim 1, characterized in that: the fixed guide piece is arranged in the first cavity and perpendicular to the axial direction of the first cavity, and a guide hole for the middle shaft to penetrate through is formed in the fixed guide piece.

15. The pressure regulating mechanism for the density relay online verification according to claim 14, wherein: the fixed guide piece is a partition plate, the partition plate divides a first cavity and a second cavity which are connected in a sealing mode into two air chambers, at least one through hole is formed in the partition plate, and the two air chambers are communicated through the through hole.