CN219979437U

CN219979437U - Dual bellows type density relay

Info

Publication number: CN219979437U
Application number: CN202321183582.2U
Authority: CN
Inventors: 马野; 焦宜洪
Original assignee: Shanghai Fengxin Instrument Co ltd
Current assignee: Shanghai Fengxin Instrument Co ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-11-07
Anticipated expiration: 2033-05-16

Abstract

The utility model relates to the technical field of electric power protection devices, in particular to a double-bellows type density relay which comprises a tested gas circuit connecting joint, a lower shell and an upper shell, wherein a double-bellows compensation pressure sensor is arranged at the bottom of an inner cavity; the density and the temperature of the utility model are almost consistent; oil leakage is avoided; is not easy to be blocked; and the misoperation can not occur to enlarge the working temperature range.

Description

Dual bellows type density relay

Technical Field

The utility model relates to the technical field of power protection devices, in particular to a double-bellows type density relay.

Background

The density relay is an important protection and control element in the power system, if the breaker fails, a great economic loss will be caused, and to ensure the operational reliability of the breaker, various top indicators of the breaker, especially SF6 gas, must be monitored frequently, and the specification of relevant standards must be reached, so that the SF6 breaker keeps a good working state for a long time.

The conventional pressure gauge type density relay (with bimetallic strip temperature compensation) can monitor in real time and perform temperature compensation, but has the following defects: 1. the display pressure is compensated to the pressure of 20 ℃ by using the bimetallic strip, so that the influence of temperature is large, and the precision is low; 2. the mechanical transmission parts are more and are easy to be blocked; 3. damping and shock resistance are increased by filling liquid, and oil leakage is easy; 4. the use temperature range is small; 5. the service life is short.

Chinese authorized utility model disclosure (bulletin) number: CN214672379U is a gas density relay based on differential pressure type double-corrugated-pipe structure, including the relay casing, set up in the inside lever of relay casing and micro-gap switch, the both ends below of lever is provided with by pressure sensor and compensation pressure sensor respectively, all be provided with the bellows in by pressure sensor and the compensation pressure sensor, the compensation pressure sensor is connected with gas connecting pipe and strengthening mechanism, strengthening mechanism includes a plurality of connecting rods and at least one elasticity clamping group, elasticity clamping group includes the elasticity arc piece the same with connecting rod quantity, be connected with the pressure spring between connecting rod and the elasticity arc piece, it uses elasticity clamping group to carry out temperature compensation and receives the temperature influence greatly, the precision is lower.

Disclosure of Invention

The utility model aims to provide a dual-bellows type density relay for solving the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a double-bellows type density relay, includes that gas circuit attach fitting, lower part casing, upper portion casing are surveyed, its characterized in that: the utility model discloses a pressure meter, including lower casing, pressure meter core, circuit board support, micro-gap switch, pressure meter core's top is provided with the scale, the top of scale is provided with the pointer, the bottom of dual bellows compensation pressure sensor is connected with by survey gas circuit attach fitting, the top of lower casing is provided with upper portion casing, and the bottom of lower casing inner chamber is provided with circuit board support and core support, the top of circuit board support is provided with the circuit board, the front of circuit board is provided with micro-gap switch, the top of core support is provided with the pressure meter core.

Preferably, the micro-switch is located below the plug, and the action end of the micro-switch is contacted with the plug.

Preferably, the double bellows compensation pressure sensor is connected with the large inner cavity of the lower shell through a connecting bolt, and the bottom of the double bellows compensation pressure sensor is connected with a transmission shaft.

Preferably, the dual bellows compensation pressure sensor is formed by combining two bellows, the inside of each bellows is filled with gas with consistent density, the bottom of each bellows is connected with a transmission shaft, and the top of each transmission shaft penetrates through the large inner cavity wall of the lower shell and extends to the large inner cavity of the lower shell.

Preferably, four plugs can be arranged on the contact arm, and the plug positions are different.

Preferably, the pressure gauge movement is located above the contact arm, and the transmission rod of the pressure gauge movement is contacted with the top of the contact arm.

Compared with the prior art, the utility model has the beneficial effects that:

the pressure chamber to be measured and the compensation pressure chamber are positioned at the same position, so that the density and the temperature of the pressure chamber to be measured are almost consistent. When the ambient temperature changes, the gas expansion conditions of the two different cavities are consistent, the compensation accuracy is higher than that of the bimetallic strip, and a temperature compensation device is not needed. As the vibration resistance of the corrugated pipe in the dual-corrugated pipe compensation pressure sensor is superior to that of the spring pipe, the vibration resistance can be increased without filling liquid, and oil leakage is avoided; the double corrugated pipes compensate the corrugated pipes on the pressure sensor, so that the mechanical transmission parts of the device are few, the clamping stagnation is not easy, the misoperation caused by the vibration and the jump of the pointer is avoided, and the working temperature range is large. The service life of the device is far longer than that of a traditional pressure gauge type density relay through the micro switch.

Drawings

Fig. 1 is a cross-sectional view of the structure of the present utility model.

In the figure: 1. the tested gas circuit is connected with the connector; 2. a dual bellows compensated pressure sensor; 3. a transmission shaft; 4. a connecting bolt; 5. a circuit board bracket; 6. a circuit board; 7. a micro-switch; 8. a lower housing; 9. a contact arm; 10. a plug; 11. an upper housing; 12. a pressure gauge movement; 13. a dial; 14. a pointer; 15. movement support.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, the present utility model provides a technical solution: the utility model provides a double-bellows type density relay, includes that gas circuit attach fitting 1, lower part casing 8, upper portion casing 11 are surveyed, its characterized in that: the inner chamber has been seted up to lower part casing 8, the below fixed mounting of lower part casing 8 has double bellows compensation pressure sensor 2, the centre of double bellows compensation pressure sensor 2 is provided with transmission shaft 3, the top of transmission shaft 3 is provided with and touches arm 9, the top of touching arm 9 is provided with top 10, the bottom of double bellows compensation pressure sensor 2 is connected with by survey gas circuit attach fitting 1, the top of lower part casing 8 is provided with upper portion casing 11, the bottom of lower part casing 8 inner chamber is provided with circuit board support 5 and core support 15, the top of circuit board support 5 is provided with circuit board 6, the front of circuit board 6 is provided with micro-gap switch 7, the top of core support 15 is provided with pressure gauge core 12, the top of pressure gauge core 12 is provided with scale 13, the top of scale 13 is provided with pointer 14.

Further, the micro switch 7 is located below the plug 10, and the actuating end of the micro switch 7 contacts with the plug 10.

Further, the double bellows compensation pressure sensor 2 is connected with a large inner cavity of the lower shell 8 through a connecting bolt 4, and a transmission shaft 3 is connected to the bottom of the double bellows compensation pressure sensor 2.

Further, the dual bellows compensation pressure sensor 2 is formed by combining two bellows, the inside of the bellows is filled with gas with consistent density, the bottom of the dual bellows is connected with the transmission shaft 3, and the top of the transmission shaft 3 penetrates through the large inner cavity wall of the lower shell 8 and extends to the large inner cavity of the lower shell 8.

Furthermore, four plugs 10 can be installed on the contact arm 9, and the positions of the plugs 10 are different.

Further, the pressure gauge movement 12 is located above the contact arm 9, and a transmission rod of the pressure gauge movement 12 is in contact with the top of the contact arm 9.

Working principle: the pressure of the dual bellows compensation pressure sensor 2 is fixed under the constant temperature condition of 20 ℃, the dual bellows compensation pressure sensor 2 is arranged in a measured pressure cavity, the filling gas pressure of the dual bellows compensation pressure sensor 2 and the measured pressure jointly act on a transmission shaft 3, when the gas density in the measured pressure cavity changes, a micro switch 5 is triggered to act, a contact point sends a switching signal so as to achieve the purpose of control (alarm and locking), the dual bellows compensation pressure sensor 2 is filled with gas with the same density as that in the measured pressure cavity, the temperature of the measured pressure cavity is almost the same as that of the compensation cavity, when the ambient temperature changes, the gas expansion conditions of the two different cavities are the same, and when the ambient temperature changes in a certain volume, the change of the generated force is the same, so that the increase and decrease of the concentrated force of the compensation cavity caused by the change of the ambient temperature is consistent with the increase and decrease of the concentrated force generated by the medium in the measured pressure cavity, and the temperature change of the two generated forces are offset, and the compensation effect of the temperature change generated by the medium in the measured pressure cavity is achieved.

Although embodiments of the present utility model 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 spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. The utility model provides a double-bellows type density relay, includes gas circuit attach fitting (1), lower part casing (8), upper portion casing (11), its characterized in that: the utility model discloses a pressure gauge is characterized in that an inner cavity is formed in a lower part shell (8), a double-corrugated pipe compensation pressure sensor (2) is fixedly arranged below the lower part shell (8), a transmission shaft (3) is arranged in the middle of the double-corrugated pipe compensation pressure sensor (2), a contact arm (9) is arranged at the top of the transmission shaft (3), a plug (10) is arranged at the top of the contact arm (9), a tested gas circuit connecting joint (1) is connected to the bottom of the double-corrugated pipe compensation pressure sensor (2), a circuit board support (5) and a core support (15) are arranged at the bottom of the inner cavity of the lower part shell (8), a circuit board (6) is arranged at the top of the circuit board support (5), a micro switch (7) is arranged on the front face of the circuit board (6), a pressure gauge core (12) is arranged at the top of the core support (15), a dial (13) is arranged at the top of the pressure gauge core (12), and a pointer (14) is arranged at the top of the dial (13).

2. A dual bellows density relay according to claim 1, wherein: the micro switch (7) is positioned below the plug (10), and the action end of the micro switch (7) is contacted with the plug (10).

3. A dual bellows density relay according to claim 1, wherein: the double bellows compensation pressure sensor (2) is connected with a large inner cavity of the lower shell (8) through a connecting bolt (4), and a transmission shaft (3) is connected to the bottom of the double bellows compensation pressure sensor (2).

4. A dual bellows density relay according to claim 1, wherein: the double corrugated pipe compensation pressure sensor (2) is formed by combining two corrugated pipes, the inside of each corrugated pipe is filled with gas with consistent density, the bottom of each double corrugated pipe is connected with the transmission shaft (3), and the top of the transmission shaft (3) penetrates through the large inner cavity wall of the lower shell (8) and extends to the large inner cavity of the lower shell (8).

5. A dual bellows density relay according to claim 1, wherein: four plugs (10) can be arranged on the contact arm (9), and the plugs (10) are different in position.

6. A dual bellows density relay according to claim 1, wherein: the pressure instrument movement (12) is positioned above the contact arm (9), and a transmission rod of the pressure instrument movement (12) is contacted with the top of the contact arm (9).