CN-121983463-A - Gas density relay for density meter

CN121983463ACN 121983463 ACN121983463 ACN 121983463ACN-121983463-A

Abstract

The invention discloses a gas density relay for a density meter, which comprises a shell, an indicating mechanism, a thermal bimetallic strip, a reference air bag and a reference air bag, wherein the shell is fixed with a dial plate, the indicating mechanism comprises an arc tube and a pointer, one end of the arc tube is sealed and installed in the shell and can linearly move, the other end of the arc tube is communicated with the density meter, the pointer is rotationally connected to the dial plate, one end of the pointer is in transmission connection with the sealed end of the arc tube, the pointer rotation plane is parallel to the linear movement direction of the arc tube, the slider-crank mechanism is fixed on the outer wall of the shell, and a slider of the slider-crank mechanism is in transmission connection with the sealed end of the arc tube to convert the linear movement of the arc tube into torque and drive the pointer to deflect, the thermal bimetallic strip is in transmission connection with a crank of the slider-crank mechanism to compensate the temperature drift of the arc tube, and the reference air bag is fixed at one end of the shell far away from the dial plate to compensate the temperature of an action point. The invention solves the problems that the conventional density meter cannot realize the equivalent high-precision temperature compensation at the rated point and the action point, and has low qualification rate and poor vibration resistance.

Inventors

DONG XIANGDONG
ZHANG SHUAI
LI LINGBO
Zou Weipu
YANG BINHUI
JIA LEI
PANG YONGPENG
HAN XIANGFENG
WANG ZHIWEI
WANG JINGLI
HE TAO
ZHANG XU
YAN XIAOWEN
ZHANG CHANG

Assignees

河南平高电气股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (5)

1. A gas density relay for a density meter, comprising: A shell (1), wherein one end of the shell (1) is fixed with a dial plate; The indicating mechanism comprises an arc-shaped pipe (2) and a pointer (4), wherein one end of the arc-shaped pipe (2) is closed, the closed end of the arc-shaped pipe is installed in the shell (1) and can move linearly, the arc-shaped convex surface of the arc-shaped pipe (2) is arranged corresponding to the inner wall of the shell (1) and one side end face of the arc-shaped convex surface of the arc-shaped pipe corresponds to the dial plate, the other end of the arc-shaped pipe (2) is communicated with the density meter, the pointer (4) is rotatably connected to the dial plate, one end of the pointer is in transmission connection with the closed end of the arc-shaped pipe (2), and the rotation plane of the pointer (4) is parallel to the linear movement direction of the arc-shaped pipe (2); the crank sliding block mechanism (8) is fixed on the outer wall of the shell (1), and the sliding block of the crank sliding block mechanism is in transmission connection with the closed end of the arc-shaped pipe (2) so as to convert the linear movement of the arc-shaped pipe (2) into torque and drive the pointer (4) to deflect; The thermal bimetallic strip (3) is fixed on the inner wall of the shell (1) and is arranged corresponding to the closed end of the arc-shaped pipe (2), and the thermal bimetallic strip (3) is in transmission connection with a crank of the crank slider mechanism (8) to compensate the temperature drift of the arc-shaped pipe (2); And the reference air bag (7) is fixed at one end of the shell (1) far away from the dial plate so as to compensate the temperature of the action point.
2. A gas density relay for a density meter according to claim 1, characterized in that the inner wall of the housing (1) is fixed with reinforcing ribs (11).
3. A gas density relay for a density meter according to claim 1, characterized in that a joint (6) for connecting the density meter is fixed to the lower end of the housing (1).
4. A gas density relay for a density meter according to claim 1, characterized in that the housing (1) is rotatably connected with a movement (5), one end of the movement (5) is fixed with the closed end of the arc tube (2), and the other end is in transmission connection with the pointer (4).
5. The gas density relay for a density meter according to claim 1, wherein the reference airbag (7) comprises a bag body (701), a large corrugated pipe (702), a small corrugated pipe (703), a micro switch (706) and a pull rod (707), the large corrugated pipe (702) and the small corrugated pipe (703) are coaxially sleeved, the large corrugated pipe (702) is fixed on the inner wall of one end, far away from the shell (1), of the bag body (701), the micro switch (706) is fixed on the inner wall of one end, close to the shell (1), of the bag body (701), one end of the pull rod (707) is fixed with the micro switch (706), and the other end of the pull rod is fixed with the inner wall of the small corrugated pipe (703).

Description

Gas density relay for density meter Technical Field The invention relates to the technical field of relays, in particular to a gas density relay for a density meter. Background At present, the domestic densimeter manufacturers commonly adopt a single compensation system design of a magnetic-assisted electric contact and metal compensation sheet structure, and a few advanced manufacturers in industry such as Langson Ke type instrument and Leyan instrument have a dual compensation structure densimeter with a micro-switch type reference air cavity and a thermal bimetallic sheet structure. The Langson collotype adopts a double-wave air cavity structure to match with the micro switch, so that the anti-seismic performance is good, but the assembly among all components of the reference air cavity is relatively dispersed, the micro switch fine adjustment structure is unstable, the production and debugging difficulties exist, the music research adopts a single-wave air bag structure to match with the micro switch, the structure is simple, the air bag processing is relatively simple, and the anti-seismic performance is low. Foreign manufacturers such as Germany WAKI and Switzerland Trafag are density meter manufacturers which apply micro switches to match with reference air cavity structures at first, but the reference air cavity structure meter of the foreign manufacturers such as Germany WAKI and Switzerland Trafag is matched with a thermal bimetallic strip for use because of different domestic and foreign density meter requirements and standard requirements, and is still a single compensation system in essence, so that the problem of equal high-precision temperature compensation of a rated point and an action point of the density meter is not solved. Therefore, how to provide a relay capable of performing high-precision temperature compensation on a density meter is a problem that needs to be solved by those skilled in the art. Disclosure of Invention In view of the above, the invention provides a gas density relay for a density meter, which solves the problems that the conventional density meter cannot realize equivalent high-precision temperature compensation at the same time with a rated point and an action point, and has low yield and poor vibration resistance. In order to achieve the above purpose, the present invention adopts the following technical scheme: A gas density relay for a density meter, comprising: A dial is fixed at one end of the shell; The indicating mechanism comprises an arc-shaped pipe and a pointer, wherein one end of the arc-shaped pipe is closed, the closed end of the arc-shaped pipe is installed in the shell and can linearly move, the arc-shaped convex surface of the arc-shaped pipe is arranged corresponding to the inner wall of the shell, one side end face of the arc-shaped convex surface of the arc-shaped pipe corresponds to the dial plate, the other end of the arc-shaped pipe is communicated with the density meter, the pointer is rotationally connected to the dial plate, one end of the pointer is in transmission connection with the closed end of the arc-shaped pipe, and the rotating plane of the pointer is parallel to the linear moving direction of the arc pipeline; The crank sliding block mechanism is fixed on the outer wall of the shell, and a sliding block of the crank sliding block mechanism is in transmission connection with the closed end of the arc tube so as to convert the linear movement of the arc tube into torque and drive the pointer to deflect; the thermal bimetallic strip is fixed on the inner wall of the shell and is arranged corresponding to the closed end of the arc-shaped pipe, and the thermal bimetallic strip is in transmission connection with a crank of the crank slider mechanism to compensate the temperature drift of the arc-shaped pipe; The reference air bag is fixed at one end of the shell far away from the dial plate so as to compensate the temperature of the action point. The technical scheme has the advantages that after external air pressure enters the open end of the C-shaped pipe through the air passage, the pressure inside the C-shaped pipe is increased, the closed end is displaced, the pressure is converted into a pointer rotation angle through the crank sliding block mechanism, pressure display is carried out through the dial plate, when the temperature changes, the thermal bimetallic strip drives the crank to displace to offset the displacement of the crank caused by temperature reduction, and the reference air bag integrated reference air cavity structure realizes the action point temperature compensation function. Preferably, the inner wall of the shell is fixed with reinforcing ribs. The structural strength of the shell is improved. Preferably, a connector for connecting the density meter is fixed at the lower end of the shell. And the air path communication between the arc-shaped pipe and the density meter is realized through the meter connector. P