CN107863269B

CN107863269B - Subminiature gas density relay

Info

Publication number: CN107863269B
Application number: CN201711223510.5A
Authority: CN
Inventors: 金海勇; 常敏; 王乐乐; 郝彩侠
Original assignee: Shanghai Roye Electric Science and Technology Co Ltd
Current assignee: Shanghai Roye Electric Science and Technology Co Ltd
Priority date: 2017-11-29
Filing date: 2017-11-29
Publication date: 2021-03-02
Anticipated expiration: 2037-11-29
Also published as: CN107863269A

Abstract

The invention discloses a subminiature gas density relay, comprising: the signal mechanism and the indicating value display mechanism are connected together; a corrugated pipe for detecting the gas density in the sulfur hexafluoride electrical equipment and a microswitch as a contact point are arranged in the signal mechanism; the indicating value display mechanism includes: the display device comprises a display baton pipe, a display temperature compensation element, a display end seat, a machine core, a dial, a pointer and a display base; one end of the display bourdon tube and one end of the display temperature compensation element are both fixed on the display end base, the other end of the display bourdon tube is connected on the display base, the other end of the display temperature compensation element is connected with the movement through the display connecting arm and the display connecting rod in sequence or the other end of the display temperature compensation element is directly connected with the movement, and the pointer is installed on the movement and is arranged in front of the dial. The subminiature sulfur hexafluoride gas density relay provided by the invention can display in a full-scale range, has good vibration resistance and high precision, is particularly easy to realize and popularize and apply.

Description

Subminiature gas density relay

Technical Field

The invention relates to the technical field of electric power, in particular to a subminiature sulfur hexafluoride gas density relay.

Background

At present, a pressure measuring element adopted by a signal mechanism (a signal control part) of a sulfur hexafluoride gas density relay for monitoring the density of sulfur hexafluoride gas in sulfur hexafluoride electrical equipment is a corrugated pipe, a contact point adopted by the signal mechanism is a microswitch, the indicating value display mechanism of the sulfur hexafluoride gas density relay also adopts the corrugated pipe in the signal mechanism as the pressure measuring element, the signal mechanism outputs an electric signal reflecting the density of the sulfur hexafluoride gas through the combined action of the corrugated pipe and the microswitch, and the indicating value display mechanism indicates the indicating value of the sulfur hexafluoride gas density through mechanical deformation of the corrugated pipe caused by pressure and a machine core control pointer. However, for the sulfur hexafluoride gas density relay, the indication value display mechanism based on the corrugated pipe has a small range display range, is difficult to realize full range display, particularly cannot realize display with the initial value of-0.1 MPa, cannot display vacuum degree during vacuum pumping, is very difficult to popularize and apply, has a large volume, is difficult to use on a medium-pressure cabinet, and thus needs to be innovated urgently. In addition, many medium-voltage electrical equipment need to have a holding mechanism and a reset mechanism after signal action, and the arc-burning overpressure alarm holding function of the electrical equipment can be realized. When the electric equipment is arcing and the pressure of the electric equipment is too high, overpressure alarm can be carried out. After the electric equipment is subjected to arc burning, the alarm signal is always kept, so that the electric equipment is easy and convenient to find by operating personnel, the safe operation of electric power is guaranteed, and innovation is also needed. And there is a need for an absolute pressure type subminiature sulfur hexafluoride gas density relay suitable for use in medium voltage electrical applications, and there is a need for innovation.

Disclosure of Invention

The invention provides a subminiature gas density relay, which is used for solving the problems that the range display range of a sulfur hexafluoride gas density relay in the prior art is small and the full-range display is difficult to realize. And the device is provided with a retaining mechanism and a reset mechanism, and can realize the function of keeping arcing overpressure alarm of electrical equipment. When the pressure of the electrical equipment is too high after the arc is burnt, overpressure alarm can be carried out. When the pressure is normal, the alarm signal is always kept, so that the alarm signal is easy to be found by operators, and the safe operation of electric power is guaranteed.

A subminiature gas density relay comprising: the device comprises a shell, a joint, a signal mechanism and a value display mechanism which are connected together;

the signal mechanism is internally provided with a corrugated pipe for detecting the gas density in the electrical equipment and a microswitch used as a contact point;

the indicating value display mechanism includes: the display device comprises a display bourdon tube, a display end seat, a machine core, a dial, a pointer, a display base and a display observation window; one end of the display bourdon tube is hermetically connected with the display end seat, the other end of the display bourdon tube is connected with the display base, the pointer is arranged on the machine core,

the signal mechanism comprises a chassis, a corrugated pipe, a support, a top rod, a fixing frame, a plurality of micro switches, a plurality of adjusting parts, an adjusting part fixing plate, a shell and a wire outlet seat, wherein one end of the corrugated pipe is welded on the chassis in a sealing way, the other end of the corrugated pipe is welded on the support in a sealing way, the fixing frame is fixed on the chassis or the shell, the top rod is fixed on the support, the micro switches are fixed on the fixing frame or the chassis, the adjusting part fixing plate is fixed on the top rod, the adjusting parts are fixed on the adjusting part fixing plate, the wire outlet seat is fixed on the shell or the chassis in a sealing way, one end of the shell is welded on the chassis in a sealing way to form a sealed air chamber, compensation air is sealed in the sealed air chamber, the compensation air has a temperature compensation effect on the signal mechanism, a display, the chassis is provided with an air inlet which is communicated with the joint on an air path through a connecting piece, and the display bourdon tube and the corrugated pipe are communicated with the joint through the air inlet and the connecting piece on the air path.

The push rod guide piece is fixed on the fixed frame.

The micro switches are arranged at the front part and the rear part of the adjusting part fixing plate;

or the micro switch is arranged at the rear part of the adjusting part fixing plate.

The device also comprises a holding mechanism or a holding mechanism and a reset mechanism after signal action;

the holding mechanism is arranged corresponding to the signal contact point needing signal holding, and after the signal acts, no matter the pressure or the density is reduced or increased, the holding mechanism can keep the signal acting state, and the signal can be reset only through the resetting mechanism; by operating the reset mechanism, the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset.

The holding mechanism is an elastic piece, and when the set pressure or density is reached, the adjusting piece pushes the action arm of the micro switch to move, so that the action arm of the micro switch passes over the elastic piece; namely, after the signal acts, no matter the pressure or the density is reduced or increased, the elastic piece can keep the acting arm of the microswitch in a signal acting state;

after the signal acts, no matter the pressure or the density is reduced or increased, the elastic piece can keep the acting arm of the microswitch in a signal acting state, and the signal can be reset through the resetting mechanism.

When the set pressure or density is reached, the regulating part pushes the action arm of the microswitch to move, so that the action arm of the microswitch stretches or compresses the spring, the action arm of the microswitch passes over the retaining element, and the retaining element clamps the action arm of the microswitch, namely after the signal acts, no matter the pressure or the density is reduced or increased, the retaining element can keep the action arm of the microswitch in a signal action state.

The reset mechanism is composed of a rod piece with an operating handle, the rod piece of the reset mechanism is rotated by rotating the operating handle, so that the rod piece of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state to reset a signal;

the reset mechanism moves horizontally or vertically, and is pressed or pulled out, so that the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch returns to a normal state, so that a signal is reset;

or the reset mechanism rotates to enable the reset mechanism to push the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state to enable the signal to reset.

The reset mechanism is composed of an element with an operating handle, the element of the reset mechanism is pushed by pressing or pulling out the operating handle, so that the element of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, the action arm of the microswitch is restored to a normal state, and a signal is reset;

the reset mechanism moves in a vertical curve, and is pressed or pulled out to enable the reset mechanism to push the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state to enable the signal to reset;

or the reset mechanism is composed of an element with an operating handle, the element of the reset mechanism is pushed by pressing or pulling out the operating handle, so that the element of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch returns to the normal state, so that the signal is reset;

or, the reset mechanism still includes the restoring device, and after the operation canceling release mechanical system, the restoring device can make the canceling release mechanical system reconversion, the restoring device is elastic element, and after the operation canceling release mechanical system ended, the elastic force of the elastic element of restoring device can make the canceling release mechanical system reconversion.

The restoring device comprises a spring, and after the restoring mechanism is operated, the restoring mechanism can be restored to the original state by the elastic force or the tensile force of the spring of the restoring device.

The density relay is disconnected with an air chamber inside the electrical equipment on the air path by closing the valve without disassembly, the verification of the density relay is completed through the verification port,

or the valve of the undetachable checking device is connected with the checking port without disassembly, and when the checking connector and the checking port are connected with each other, the valve is automatically closed, so that the density relay is shut off from an air chamber in the electrical equipment on an air path, and the checking of the density relay is completed;

or the non-detachable calibration device can be detached, and the valve is automatically closed when the calibration transition joint is connected with the calibration port, so that the density relay is turned off from the air chamber in the electrical equipment on the air path, and the calibration of the density relay is completed;

or the valve of the non-detachable calibration device is a cut-off valve, so that the density relay can be disconnected with the air chamber in the electrical equipment on the air path without being detached by closing the valve, and the calibration of the density relay is completed through the calibration port;

or the valve of the undetachable checking device is a stop valve, the stop valve is connected with the checking port without disassembly, when the checking connector and the checking port are connected, the stop valve is closed, the density relay is closed on the gas path and the gas chamber in the electrical equipment, the checking of the density relay is completed, the checking port is a self-sealing valve, and the checking of the density relay is completed through the checking port;

or the non-detachable check joint comprises a valve, a check port, a valve seat, a self-sealing valve device and a plugging piece; the valve seat is provided with a relay air passage and a switch device air passage, the self-sealing valve device is provided with a self-sealing valve air passage, and the relay air passage, the switch device air passage and the self-sealing valve air passage are communicated; the valve seat is arranged on one side of a self-sealing valve sleeve of the self-sealing valve device, the plugging piece is detachably arranged on the other side of the self-sealing valve sleeve, and a second interface matched with an inflation transition joint or a verification transition joint is arranged on the other side of the self-sealing valve sleeve; the inner cavity of the self-sealing valve sleeve is provided with a self-sealing valve core which can move along the axial direction to open or close the vent channel of the self-sealing valve, one side of the self-sealing valve sleeve, which is connected with the valve seat, is provided with a valve core guide piece, a first spring is arranged between the valve core guide piece and the self-sealing valve core, and the self-sealing valve core is provided with a stop valve which is arranged opposite to the vent channel of the switch equipment or a ball valve which is matched with the opening part of the vent channel of the switch equipment;

or the non-detachable calibration device further comprises a plugging piece, wherein the plugging piece is detachably arranged on the other side of the self-sealing valve sleeve, and a second interface matched with the inflation transition joint or the calibration transition joint is arranged on the other side of the self-sealing valve sleeve;

or the non-detachable checking device mainly comprises a valve seat and a self-sealing valve device; the valve seat is provided with a relay air passage and a switchgear air passage, the self-sealing valve device is provided with a self-sealing valve air passage, and the relay monitoring air passage, the switchgear air passage and the self-sealing valve air passage are communicated; the valve seat is arranged on one side of a self-sealing valve sleeve of the self-sealing valve device; the inner cavity of the self-sealing valve sleeve is provided with a self-sealing valve core which can move along the axial direction to open or close the self-sealing valve vent channel, one side of the self-sealing valve sleeve connected with the valve seat is provided with a valve core guide piece, a first spring is arranged between the valve core guide piece and the self-sealing valve core, and the self-sealing valve core is provided with a stop valve arranged opposite to the switch equipment vent channel or a ball valve matched with the opening part of the switch equipment vent channel.

The display mechanism also comprises a display temperature compensation element which is a compensation device filled with compensation gas; preferably, the display temperature compensation element is a bimetallic strip, and the bimetallic strip and compensation gas in a sealed gas chamber of the display mechanism play a role in temperature compensation for the display mechanism.

The compensation device filled with compensation gas is a display compensation bucking pipe filled with compensation gas, or the compensation device filled with compensation gas is a display compensation corrugated pipe filled with compensation gas, and the display compensation bucking pipe further comprises a temperature sensing bulb, wherein the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe.

Further comprising: the wire outlet seat is provided with a vibration-avoiding piece, the wire outlet seat is fixed on the vibration-avoiding piece, and the vibration-avoiding piece is fixed on the chassis or the shell; preferably, the vibration-absorbing member is formed by a corrugated pipe or a thin plate with a vibration-absorbing function.

The connecting wire of the wire outlet seat is connected with the microswitch, and the connecting wire of the wire outlet seat is connected to a wire holder or a cable outside the shell.

The indicating value display mechanism is fully sealed in the display observation window, so that the indicating value is displayed as absolute pressure and is not influenced by the altitude, the front surface of the display observation window is made of transparent glass, and the display observation window is fixedly connected with the chassis in a sealing manner through a sealing ring.

Further comprising: the inflation pipe arranged on the chassis or the shell can be filled with corresponding compensation gas through the inflation pipe.

The air inlet is arranged on the chassis or the shell, and the joint is connected with the air inlet through an air pipe or directly connected with the air inlet; preferably, the display device further comprises an air inlet, the air inlet is arranged on the base plate, the joint is connected with the air inlet, the sealed air chamber is filled with compensation air, the display base is fixed on the base plate through a connecting pipe or directly, and the display base is communicated with the joint on an air path.

The microswitch also comprises an action arm, after the signal acts, the retaining mechanism retains the action arm, no matter the pressure or the density is reduced or increased, the retaining mechanism can retain the signal action state, the signal can be reset only through the resetting mechanism, the action arm is an elastic piece, when the set pressure or density is reached, the adjusting piece pushes the action arm of the microswitch to move, the action arm of the microswitch passes over the retaining mechanism, and the action arm of the microswitch is in the signal action state.

The resetting mechanism is sealed with the shell, when the resetting mechanism is operated, the sealed air chamber in the shell is always in a sealed state, and the resetting mechanism is sealed with the shell through the sealing ring.

The holding mechanism is a magnetic element. When the set pressure or density is reached, the adjusting piece pushes the action arm of the micro switch to move, so that the action arm of the micro switch is tightly attached to the magnetic element. Namely, after the signal acts, no matter the pressure or the density is reduced or increased, the magnetic element can keep the acting arm of the microswitch in a signal acting state; alternatively, the holding mechanism comprises a magnetic element. When the set pressure or density is reached, the adjusting piece pushes the action arm of the microswitch to move, so that the action arm of the microswitch passes over the retaining mechanism and is close to the magnetic element, namely, after the signal acts, no matter the pressure or the density is reduced or increased, the magnetic element of the retaining mechanism can better keep the action arm of the microswitch in a signal acting state.

The undetachable checking device and the connecting piece are mutually fused together.

According to the subminiature sulfur hexafluoride gas density relay, the pressure measuring element of the indicating value display mechanism (display part) adopts the Bourdon tube, the pressure measuring element is different from the pressure measuring element of the display part in the prior art which adopts the corrugated tube, the problems that the corrugated tube is small in displacement and difficult to realize full-range display are solved, the full-range display of the gas density relay can be very easily realized, particularly, the display with the initial value of-0.1 MPa is very easy to realize, the vacuum degree can be displayed when the vacuum is pumped, and the subminiature sulfur hexafluoride gas density relay is very easy to popularize and. Meanwhile, a pressure measuring element adopted by a signal mechanism (a signal control part) of the density relay is a corrugated pipe to ensure the high vibration resistance of the density relay, and a contact point adopted is a microswitch to ensure the reliable electrical performance of the density relay. Particularly, the electric arc over-voltage alarm device has a holding mechanism and a reset mechanism through great innovation, and can realize the function of holding the arc over-voltage alarm of the electric equipment. Namely, when the pressure of the electrical equipment is too high after the arc is burnt, the overpressure alarm can be carried out. When the pressure is normal, the alarm signal is always kept, so that operators can find the arcing phenomenon of the electrical equipment, timely process the electrical equipment with the arcing phenomenon and guarantee the safe operation of electric power. The gas density relay with the gas pressure (or gas density) maintaining mechanism and the resetting mechanism can well guarantee the safety of a power grid. Particularly, the electric arc over-voltage alarm device has a holding mechanism and a reset mechanism through great innovation, and can realize the function of holding the arc over-voltage alarm of the electric equipment. Namely, when the electric equipment is in arcing and the pressure of the electric equipment is too high, overpressure alarm can be given. When the pressure of the electrical equipment is normal after the arcing is finished, the alarm signal is always kept, so that operators can find the arcing phenomenon of the electrical equipment, timely process the electrical equipment with the arcing phenomenon and guarantee the safe operation of electric power.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor;

fig. 1 is a schematic partial cross-sectional view of a subminiature sulfur hexafluoride gas density relay in accordance with an embodiment of the present invention;

FIG. 2 is a signal inactive state diagram of a subminiature sulfur hexafluoride gas density relay in accordance with an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a signal operation hold state of a subminiature sulfur hexafluoride gas density relay in accordance with an embodiment of the present invention;

fig. 4 is a schematic illustration of a signal actuation reset process for a subminiature sulfur hexafluoride gas density relay in accordance with an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a signal-operated reset process of a subminiature sulfur hexafluoride gas density relay in accordance with another embodiment of the present invention.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic partial cross-sectional view of a subminiature sulfur hexafluoride gas density relay according to an embodiment of the present invention, and as shown in fig. 1, the embodiment of the present invention discloses a subminiature gas density relay, including: the shell 18, the joint 3, and the signal mechanism and the value display mechanism which are connected together;

the signal mechanism is internally provided with a corrugated pipe 1 for detecting the gas density in the electrical equipment and a microswitch 16 as a contact point;

the indicating value display mechanism includes: the display bourdon tube 4, the display end seat 5, the movement 32, the dial 31, the pointer 33, the display base 7 and the display observation window 30; one end of the display bourdon tube 4 is hermetically connected to the display end seat 5, the other end of the display bourdon tube 4 is connected to the display base 7, and the pointer 33 is installed on the movement 32.

The signal mechanism comprises a chassis 11, a corrugated pipe 1, a support 37, a push rod 13, a fixing frame 17, a plurality of micro switches 16, a plurality of adjusting parts 38, an adjusting part fixing plate 9, a shell 18 and a wire outlet seat 39, wherein one end of the corrugated pipe 1 is hermetically welded on the chassis 11, the other end of the corrugated pipe 1 is hermetically welded on the support 37, the fixing frame 17 is fixed in the chassis 11 or the shell 18, and the push rod 13 is fixed on the support 37. The microswitch 16 is fixed on the fixed frame 17 or the chassis 11, the adjusting part fixing plate 9 is fixed on the mandril 13, the adjusting parts 38 are fixed on the adjusting part fixing plate 9, and the wire outlet seat 39 is fixed on the shell 18 or the chassis 11 in a sealing way. One end of the housing 18 is hermetically welded to the chassis 11 to form a sealed air chamber G. The device is characterized in that compensation gas is sealed in the sealed gas chamber G, and the compensation gas has a temperature compensation effect on the signal mechanism. The display observation window 30 is fixed to the chassis 11, and the indication display mechanism is provided in the display observation window 30. The joint 3 is fixed to the housing 18. The display end seat 5 is fixed on the chassis 11, an air inlet A is arranged on the chassis 11, and the air inlet A is communicated with the connector 3 on an air path through a connecting piece B. On the gas circuit, the display Badon tube 4 and the corrugated tube 1 are communicated with the joint 3 through the gas inlet A and the connecting piece B.

The connector 3 is fixed to the housing 18 and the display means is in the display window 30. The spring 12 is sleeved on the top rod 13, and one end of the spring 12 is abutted with the bracket 37, and the other end is abutted with the top rod guide 39. The ejector rod 13 passes through the ejector rod guide 39, and the ejector rod guide 39 is fixed on the fixed frame 17

Micro switches 16 are provided at the front and rear of the adjuster fixing plate 9.

Referring to fig. 2, 3 and 4, the product of the embodiment of the present invention further includes a holding mechanism 14 and a reset mechanism 40 after the signal action. The holding mechanism 14 is provided corresponding to a signal contact requiring signal holding, and when the signal is operated, the holding mechanism 14 can maintain the signal operation state regardless of decrease or increase in pressure or density, and the signal can be reset only by the reset mechanism 40. The retaining mechanism 14 is an elastic member. When the set pressure or density is reached, the adjustment member 38 pushes the actuating arm 15 of the microswitch 16 to move, causing the actuating arm 15 of the microswitch 16 to pass over the elastic member 14. That is, after the signal is activated, the elastic member 14 keeps the activation arm 15 of the microswitch 16 in the signal activation state regardless of the decrease or increase of the pressure or the density.

With particular reference to fig. 2 and 3, the retaining mechanism is an elastic member 14. When the set pressure or density is reached, the adjustment member 38 pushes the actuating arm 15 of the microswitch 16 to move, causing the actuating arm 15 of the microswitch to pass over the elastic member 14, as shown in fig. 3. Namely, after the signal is activated, the elastic member 14 can keep the activation arm 15 of the microswitch in the signal activation state no matter the pressure or the density is decreased or increased. The retaining mechanism described of course essentially comprises a spring and a retaining element. When the set pressure or density is reached, the adjusting piece pushes the action arm of the micro switch to move, so that the action arm of the micro switch stretches or compresses the spring, the action arm of the micro switch passes over the retaining element, and the retaining element clamps the action arm of the micro switch. Namely, after the signal action, no matter the pressure or the density is reduced or increased, the holding element can keep the action arm of the microswitch in a signal action state. After the signal is activated, no matter the pressure or the density is reduced or increased, the elastic element can keep the activation arm of the microswitch in the signal activation state, and the signal can be reset only through the reset mechanism 40. Referring to fig. 4, as shown by the dotted line in the figure, by operating the reset mechanism 40, the reset mechanism 40 pushes the holding mechanism 14 away from the actuating arm 15 of the microswitch, the actuating arm 15 of the microswitch returns to the normal state, and the signal is reset. The reset mechanism is in rotary motion, the reset mechanism is rotated, the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset. The reset mechanism is composed of a rod piece with an operating handle, the rod piece 40 of the reset mechanism is rotated by rotating the operating handle, so that the rod piece of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the micro switch, and the action arm of the micro switch is restored to a normal state, so that the signal is reset. The reset mechanism moves horizontally or vertically, and is pressed or pulled out, so that the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset. The reset mechanism is composed of an element with an operating handle, the element of the reset mechanism is pushed by pressing or pulling out the operating handle, the element of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset.

Referring to fig. 3 and 4, the resetting mechanism further comprises a restoring device 42, and after the resetting mechanism is operated, the restoring device 42 can restore the resetting mechanism. The restoring device is an elastic element 42, and after the operation of the restoring mechanism is finished, the elastic force of the elastic element of the restoring device can restore the restoring mechanism 40. Or the restoring device comprises a spring, and after the operation of the restoring mechanism is finished, the elastic force or the tensile force of the spring of the restoring device can restore the restoring mechanism to the original state.

In addition, the retaining mechanism specifically described may primarily include a spring and a retaining element. When the set pressure or density is reached, the adjusting member 38 pushes the actuating arm 15 of the microswitch to move, so that the actuating arm 15 of the microswitch stretches or compresses the spring, the actuating arm of the microswitch goes over the retaining element, and the retaining element 14 clamps the actuating arm of the microswitch. Namely, after the signal action, no matter the pressure or the density is reduced or increased, the holding element can keep the action arm of the microswitch in a signal action state. After the signal is activated, no matter the pressure or the density is reduced or increased, the elastic element can keep the activation arm of the microswitch in the signal activation state, and the signal can be reset only through the reset mechanism 40. That is, by operating the reset mechanism 40, the reset mechanism 40 pushes the holding mechanism 14 away from the operating arm 15 of the microswitch 16, and the operating arm 15 of the microswitch 16 returns to the normal state, thereby resetting the signal. The reset mechanism 40 rotates, the reset mechanism 40 pushes the holding mechanism 14 to be far away from the action arm 15 of the microswitch, the action arm 15 of the microswitch returns to a normal state, and the signal is reset. The return mechanism 40 is sealed from the housing, and the seal air chamber G is always in a sealed state when the return mechanism 40 is operated. The reset mechanism 40 is sealed with the housing by a seal ring. The reset mechanism 40 is composed of a rod 401 with an operating handle, and by rotating the operating handle and the rod of the reset mechanism, the rod 401 of the reset mechanism pushes the holding mechanism 14 to be far away from the action arm 15 of the microswitch, and the action arm 15 of the microswitch returns to a normal state, so that the signal is reset. Referring to fig. 5, the reset mechanism may be moved horizontally or vertically, as shown by the dotted lines, and the reset mechanism 40 is pushed or pulled to push the holding mechanism away from the operating arm of the microswitch, so that the operating arm of the microswitch returns to the normal state to reset the signal. Or the reset mechanism is composed of an element with an operating handle, the element of the reset mechanism is pushed by pressing or pulling out the operating handle, so that the element of the reset mechanism pushes the holding mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset. The reset mechanism can move in a vertical curve, for example, the reset mechanism is pressed or pulled out, so that the reset mechanism pushes the holding mechanism to be away from the action arm of the microswitch, the action arm of the microswitch returns to a normal state, and the signal is reset. The reset mechanism is composed of an element with an operating handle, the element of the reset mechanism is pushed by pulling up or pulling down the operating handle, the element of the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state, so that the signal is reset.

The reset mechanism 40 further comprises a restoring device 42, and after the reset mechanism 40 is operated, the restoring device 42 can restore the reset mechanism 40. The restoring device 42 is an elastic element, and after the operation of the restoring mechanism is finished, the elastic force of the elastic element 42 of the restoring device can restore the restoring mechanism 40. In addition, the restoring device comprises a spring, and after the operation of the restoring mechanism is finished, the elastic force or the tensile force of the spring of the restoring device can restore the restoring mechanism to the original state.

The product of the embodiment of the invention also comprises a non-detachable checking device C. The calibration device C and the connecting piece B are fused together without disassembling. The non-detachable checking device C (fused with the connecting piece B) is fixed on the chassis or the shell or the joint. And the undetachable checking device C, an air inlet A of the chassis and a connecting pipe 8 of the connecting piece B are communicated with the joint 3 on an air path.

The non-detachable checking device C mainly comprises a valve 19 and a checking port 26, the density relay can be disconnected with an air chamber inside the electrical equipment on an air path by closing the valve 19 without detaching, and the checking of the density relay is completed through the checking port 26. The valve 19 of the non-detachable checking device is a cut-off valve, such as a ball valve, a butterfly valve, a gate valve, a stop valve, a plug valve, a butterfly valve, a needle valve, a diaphragm valve and the like, can be detached without, and the density relay is turned off from an air chamber inside the electrical equipment on the air path by closing the valve, so that the checking of the density relay is completed through the checking port.

In this embodiment, the valve 19 and the check port 26 of the undetachable check device are connected together without disassembly, and when the check connector and the check port 26 are connected with each other, the valve 19 is automatically closed, so that the density relay is turned off from the air chamber inside the electrical equipment on the air path, and the check of the density relay is completed. The non-detachable calibration device can be detached, and the valve 19 is automatically closed when the calibration transition joint is connected with the calibration port 26, so that the density relay is closed off from the air chamber inside the electrical equipment on the air path, and the calibration of the density relay is completed. Specifically, the valve of the undetachable checking device is the stop valve 19, the stop valve 19 is connected with the checking port, the disassembly is not needed, when the checking connector is well connected with the checking port, the stop valve 19 is closed, the density relay is shut off from the air chamber inside the electrical equipment on the air path, and the checking of the density relay is completed. The check port 26 is a self-sealing valve, and the check of the density relay is completed through the check port.

Referring to fig. 1, the non-detachable check joint comprises a valve 19, a check port 26, a valve seat 23, a self-sealing valve device and a plugging piece 27; the valve seat is provided with a relay air passage and a switch device air passage, the self-sealing valve device is provided with a self-sealing valve air passage, and the relay air passage, the switch device air passage and the self-sealing valve air passage are communicated; the valve seat is arranged on one side of a self-sealing valve sleeve of the self-sealing valve device, the plugging piece is detachably arranged on the other side of the self-sealing valve sleeve, and a second interface matched with an inflation transition joint or a verification transition joint is arranged on the other side of the self-sealing valve sleeve; the inner cavity of the self-sealing valve sleeve is provided with a self-sealing valve core which can move along the axial direction to open or close the self-sealing valve vent channel, one side of the self-sealing valve sleeve connected with the valve seat is provided with a valve core guide piece, a first spring 20 is arranged between the valve core guide piece and the self-sealing valve core, and the self-sealing valve core is provided with a stop valve arranged opposite to the switch equipment vent channel or a ball valve matched with the opening part of the switch equipment vent channel. The non-detachable checking device further comprises a blocking piece, wherein the blocking piece is detachably arranged on the other side of the self-sealing valve sleeve, and a second interface matched with the inflation transition joint or the checking transition joint is arranged on the other side of the self-sealing valve sleeve. In addition, the non-detachable checking device mainly comprises a valve seat and a self-sealing valve device; the valve seat is provided with a relay air passage and a switchgear air passage, the self-sealing valve device is provided with a self-sealing valve air passage, and the relay monitoring air passage, the switchgear air passage and the self-sealing valve air passage are communicated; the valve seat is arranged on one side of a self-sealing valve sleeve of the self-sealing valve device; the inner cavity of the self-sealing valve sleeve is provided with a self-sealing valve core which can move along the axial direction to open or close the self-sealing valve vent channel, one side of the self-sealing valve sleeve connected with the valve seat is provided with a valve core guide piece, a first spring is arranged between the valve core guide piece and the self-sealing valve core, and the self-sealing valve core is provided with a stop valve arranged opposite to the switch equipment vent channel or a ball valve matched with the opening part of the switch equipment vent channel. In order to facilitate air supplement, the air supplement device also comprises an air supplement joint.

The product display mechanism of the embodiment of the invention further comprises a display temperature compensation element which is a bimetallic strip 6. The bimetallic strip 6 and compensation gas in a sealed gas chamber of the display mechanism play a role in temperature compensation for the indication value display mechanism together. Of course, the display mechanism also includes a display temperature compensation element, which is a compensation device filled with a compensation gas. The compensation device filled with the compensation gas is a display compensation bucking pipe filled with the compensation gas, or the compensation device filled with the compensation gas is a display compensation corrugated pipe filled with the compensation gas. Of course the display temperature compensation element may also be a sealing gas. The temperature sensing bulb is characterized by further comprising a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe.

The product of the embodiment of the invention also comprises: spring 12, spring 12 is nested on top bar 13, one end of spring 12 rests against bracket 37 and the other end of spring rests against top bar guide 39. The wire outlet seat is provided with a vibration-proof piece, the wire outlet seat is fixed on the vibration-proof piece, and the vibration-proof piece is fixed on the chassis or the shell. The vibration-proof piece is composed of a corrugated pipe or a thin plate with a vibration-proof function. The connecting wire of the wire outlet seat is connected with the microswitch, and the connecting wire of the wire outlet seat is connected to a wire holder or a cable outside the shell. The indication value display mechanism is fully sealed in the display observation window 30, so that the indication value is displayed as absolute pressure and is not influenced by the altitude, and the front surface of the display observation window is transparent glass. The display observation window 30 is fixedly connected with the chassis 11 in a sealing way through a sealing ring 36. The display viewing window 30 is externally nested with a watch cover 34. An inflation tube arranged on the chassis or the shell. The corresponding compensation gas can be charged through the gas charging pipe. The air inlet is arranged on the chassis or the shell, and the joint is connected with the air inlet through an air pipe or directly connected with the air inlet. The air inlet is arranged on the chassis, the joint is connected with the air inlet, and the sealed air chamber is filled with compensation air. The display base is fixed on the chassis through a connecting pipe or directly, and the display base is communicated with the joint on the gas path. The outgoing line connecting seat is fixedly arranged on the sealed cavity through a wiring seat mounting transition piece, or the outgoing line connecting seat is directly and fixedly arranged on the sealed cavity. And the outside of the sealed cavity is wrapped with a heat-insulating layer. The tray is arranged behind the watchcase, and a vibration-proof pad is arranged between the tray and the watchcase.

The other end of the holding mechanism 14 is bent toward the inside of the switch fixing frame 41; the actuating arm 15 of the micro switch abuts against the adjusting piece 38, and when the pressure is increased, one end of the actuating arm 15 of the micro switch can slide along the retaining mechanism 14 under the driving of the adjusting piece 38 until the retaining mechanism 14 abuts against the retaining mechanism 14.

The microswitch can be arranged outside the corrugated pipe 1, and the microswitch 16 is arranged in front of or behind the regulating part fixing plate. The present embodiment further includes a holding mechanism 14 and a reset mechanism 40, the holding mechanism 14 is provided corresponding to a signal contact requiring signal holding, and when the signal contact is operated, the holding mechanism 14 can maintain a signal operation state regardless of a decrease or an increase in pressure or density, and can reset a signal only by the reset mechanism 40.

The embodiment also comprises a non-detachable check joint which is fixed on the chassis, the shell or the joint. The non-detachable check joint comprises a valve, a check port, a valve seat, a self-sealing valve device and a plugging piece; the valve seat is provided with a relay air passage and a switch device air passage, the self-sealing valve device is provided with a self-sealing valve air passage, and the relay air passage, the switch device air passage and the self-sealing valve air passage are communicated; the valve seat is arranged on one side of a self-sealing valve sleeve of the self-sealing valve device, the plugging piece is detachably arranged on the other side of the self-sealing valve sleeve, and a second interface matched with an inflation transition joint or a verification transition joint is arranged on the other side of the self-sealing valve sleeve; the inner cavity of the self-sealing valve sleeve is provided with a self-sealing valve core which can move along the axial direction to open or close the self-sealing valve vent channel, one side of the self-sealing valve sleeve connected with the valve seat is provided with a valve core guide piece, a first spring is arranged between the valve core guide piece and the self-sealing valve core, and the self-sealing valve core is provided with a stop valve arranged opposite to the switch equipment vent channel or a ball valve matched with the opening part of the switch equipment vent channel. The sealed gas chamber is filled with compensation gas, or the corrugated pipe is filled with compensation gas; the compensation gas is connected with a temperature sensing bulb through a connecting gas pipe; and the compensation gas is supplemented through an inflation pipe, and the inflation pipe is arranged on the chassis or the shell. The compensation device filled with the compensation gas is a display compensation bucking pipe filled with the compensation gas, or the compensation device filled with the compensation gas is a display compensation corrugated pipe filled with the compensation gas. The wire outlet seat is fixed on the chassis or the shell; or the wire outlet seat is provided with a vibration-avoiding piece, the wire outlet seat is fixed on the vibration-avoiding piece, the vibration-avoiding piece is fixed on the chassis or the shell, the vibration-avoiding piece is composed of a corrugated pipe or a thin plate with a vibration-avoiding function, the connecting wire of the wire outlet seat is connected with the microswitch, and the connecting wire of the wire outlet seat is connected to a wire holder or a cable outside the shell. The indicating value display mechanism is totally enclosed in showing the observation window, and the indicating value shows for absolute pressure, it openly is transparent glass to show the observation window, it passes through the sealing washer and is in the same place with chassis seal fixed connection to show the observation window, it has the table lid to show the embedding of observation window outside. The display temperature compensation element includes: a compensation device formed by bimetallic strips or a compensation device filled with a compensation gas. The air inlet is arranged on the chassis or the shell, and the joint is connected with the air inlet through an air pipe or directly connected with the air inlet; or the air inlet is arranged on the chassis, the joint is connected with the air inlet, the sealed air chamber is filled with compensation air, the display base is fixed on the chassis through a connecting pipe or directly, and the display base is communicated with the joint on an air path. The chassis is arranged below or below the corrugated pipe, and gas compensation is carried out through the corrugated pipe or the gas chamber. The outgoing line connecting seat is fixedly arranged on the sealed cavity through a wiring seat mounting transition piece, or the outgoing line connecting seat is directly and fixedly arranged on the sealed cavity. The outside of the sealed cavity is wrapped with a heat-insulating layer; the vibration-proof device further comprises a vibration-proof pad, and the vibration-proof pad is arranged between the chassis and the watchcase.

In addition, the subminiature sulfur hexafluoride gas density relay may further include an actuating arm, and the holding mechanism holds (clamps) the actuating arm after the signal is actuated, and the holding mechanism can maintain the signal actuated state no matter the pressure or the density is reduced or increased, and the signal can be reset only through the reset mechanism. For example, the action arm is an elastic part, when the set pressure or density is reached, the adjusting part pushes the action arm of the micro switch to move, and the action arm of the micro switch can well pass over the retaining mechanism because the action arm is the elastic part, and the retaining mechanism retains (clamps) the action arm. Thus, the holding mechanism can hold the operating arm of the microswitch in the signal operating state regardless of the decrease or increase of the pressure or the density after the signal operation. In addition, the holding mechanism may be a magnetic element. When the set pressure or density is reached, the adjusting piece pushes the action arm of the micro switch to move, so that the action arm of the micro switch is tightly attached to the magnetic element. Namely, after the signal is operated, no matter the pressure or the density is reduced or increased, the magnetic element can keep the operating arm of the microswitch in a signal operating state.

The method for realizing the alarm (locking) signal holding of the subminiature sulfur hexafluoride gas density relay can also comprise the following steps: the microswitch is provided with an action arm, after the signal acts, the retaining mechanism retains the action arm, no matter the pressure or the density is reduced or increased, the retaining mechanism can keep the signal action state, and the signal can be reset only through the resetting mechanism. Specifically, the actuating arm is an elastic member. When the set pressure or density is reached, the regulating piece pushes the action arm of the micro switch to move, and the action arm of the micro switch can conveniently pass over the retaining mechanism because the action arm is an elastic piece, and the retaining mechanism can clamp the action arm. That is, after the signal operation, the holding mechanism can hold the operating arm of the microswitch in the signal operation state no matter the pressure or the density is decreased or increased.

The micro switch can be arranged on the outer side of the corrugated pipe, namely the micro switch can be arranged below and sink, so that the thickness of the density relay is thinned.

The technical scheme of the density relay can be arranged and combined by more than 4 types, for example, compensation gas is filled in a corrugated pipe, and a chassis of the density relay is arranged up or down; or the air chamber is filled with compensation air, and the chassis of the air chamber is arranged up or down. And the display compensation technical scheme can be as follows: bimetallic strips, or bourdon tubes, or bellows; and the measurement principle of the display part may be: absolute pressure or relative pressure.

It is shown that the temperature compensating element may be a sealed gas and the compensating strip may not be a bimetallic strip.

The gas can be sulfur hexafluoride gas, sulfur hexafluoride mixed gas, nitrogen, compressed air and other gases.

The display base is fixed on the chassis, or the display base is fixed on the bottom plate. The holder may also be fixed to or within the housing. The ram guide may also be fixed to or within the housing. The microswitch may also be fixed on or within the housing.

In a word, the density relay can be arranged and combined in 4 ways, the corrugated pipe compensates gas, and a chassis is arranged up or down; the air chamber compensates air, and the chassis is up or down. And (3) display compensation: bimetallic strips, or bourdon tubes, or bellows; displaying: absolute pressure or relative pressure. Can meet various requirements in all directions, and well ensure the safety of the power grid.

The display base is fixed on the chassis. And the sealed gas chamber is filled with compensation gas, or the corrugated pipe is filled with compensation gas. The wire outlet seat is fixed on the chassis or the shell; or the wire outlet seat is provided with a vibration-avoiding piece, the wire outlet seat is fixed on the vibration-avoiding piece, and the vibration-avoiding piece is fixed on the chassis or the shell. The position of the microswitch can be arranged outside the bellows. Below, sink down; the adjusting part fixing plate is U-shaped. The chassis is arranged below or below the corrugated pipe, and gas compensation is carried out through the corrugated pipe or the gas chamber.

The subminiature sulfur hexafluoride gas density relay has a gas pressure (or gas density) maintaining mechanism and a reset mechanism through great innovation, and can realize the arcing overpressure alarm function of electrical equipment. Namely, when the pressure of the electrical equipment is too high after the arc is burnt, the overpressure alarm can be carried out. When the pressure is normal, the alarm signal is always kept, so that operators can find the arcing phenomenon of the electrical equipment, timely process the electrical equipment with the arcing phenomenon and guarantee the safe operation of electric power.

According to the subminiature sulfur hexafluoride gas density relay, the corrugated pipe is adopted as a signal mechanism, and good anti-seismic performance is guaranteed; the indication value display mechanism adopts the Bardon tube, and the problems that the displacement of the corrugated tube is small and full-range display is difficult to realize are solved due to the adoption of the Bardon tube, so that the density relay in the full-range can be very easily realized, particularly, the display with the initial value of-0.1 MPa can be very easily realized, the vacuum degree can be displayed during vacuum pumping, and the popularization and the application are very easy. In addition, a display temperature compensation element is adopted to realize the temperature compensation function of the indicating value display part, so that the precision is improved and ensured. In a word, the subminiature sulfur hexafluoride gas density relay has the advantages of no oil, good vibration resistance, high precision, good electrical performance, long service life and full-range display range. Meanwhile, the microswitch can be arranged in the sealed cavity, sulfur hexafluoride gas is contained in the sealed cavity, and the sulfur hexafluoride gas has strong insulating and arc extinguishing capabilities, so that the electrical contact of the technical density relay has very good electrical performance, is reliable to use, is reliable in contact with the contact, and is long in service life, and the microswitch is a great innovation point and characteristic of the invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A subminiature gas density relay comprising: the device comprises a shell, a joint, a signal mechanism and a value display mechanism which are connected together;

the signal mechanism is internally provided with a corrugated pipe for detecting the gas density in the electrical equipment and a microswitch used as a contact point; the indicating value display mechanism includes: the display device comprises a display bourdon tube, a display end seat, a machine core, a dial, a pointer, a display base and a display observation window; one end of the display bourdon tube is hermetically connected with the display end seat, the other end of the display bourdon tube is connected with the display base, the pointer is installed on the machine core, the signal mechanism comprises a chassis, a corrugated tube, a support, a push rod, a fixing frame, a plurality of micro switches, a plurality of adjusting pieces, an adjusting piece fixing plate, a shell and a wire outlet seat, one end of the corrugated tube is hermetically welded on the chassis, the other end of the corrugated tube is hermetically welded on the support, the fixing frame is fixed on the chassis or the shell, the push rod is fixed on the support, the micro switches are fixed on the fixing frame or the chassis, the adjusting piece fixing plate is fixed on the push rod, the adjusting pieces are fixed on the adjusting piece fixing plate, the wire outlet seat is hermetically fixed on the shell or the chassis, one end of the shell is hermetically welded on the chassis to, the compensation gas has a temperature compensation effect on the signal mechanism, the display observation window is fixed on the chassis, the indication value display mechanism is arranged in the display observation window, the connector is fixed on the shell, the display base is fixed on the chassis, the chassis is provided with an air inlet hole, the air inlet hole is communicated with the connector on an air path through a connecting piece, and the display Bardon tube and the corrugated tube are communicated with the connector through the air inlet hole and the connecting piece on the air path;

the device also comprises a holding mechanism or a holding mechanism and a reset mechanism after signal action; the holding mechanism is arranged corresponding to the signal contact point needing signal holding, and after the signal acts, no matter the pressure or the density is reduced or increased, the holding mechanism can keep the signal acting state, and the signal can be reset only through the resetting mechanism; by operating the reset mechanism, the reset mechanism pushes the retaining mechanism to be far away from the action arm of the microswitch, and the action arm of the microswitch is restored to a normal state to reset the signal;

2. The subminiature gas density relay of claim 1, further comprising a push rod guide, wherein the push rod passes through the push rod guide, and wherein the push rod guide is fixed to the holder.

3. The subminiature gas density relay of claim 1, wherein micro-switches are disposed at the front and rear of the adjuster fixing plate; or the micro switch is arranged at the rear part of the adjusting part fixing plate.

4. A subminiature gas density relay according to claim 1, wherein the holding mechanism comprises a spring and a holding element, wherein when a set pressure or density is reached, the actuator arm of the micro-switch is moved by the actuator to extend or compress the spring and move the actuator arm of the micro-switch over the holding element, and the holding element engages the actuator arm of the micro-switch, i.e., the holding element maintains the actuator arm of the micro-switch in a signal actuation state regardless of a decrease or increase in pressure or density after the signal actuation.

5. The subminiature gas density relay of claim 4, wherein the reset mechanism is a lever with an operating handle, and by rotating the operating handle, the lever of the reset mechanism is rotated, such that the lever of the reset mechanism pushes the holding mechanism away from the actuating arm of the micro switch, and the actuating arm of the micro switch returns to a normal state, such that the signal is reset;

6. The subminiature gas density relay of claim 5, wherein the reset mechanism is a lever-carrying element that is pushed by pressing or pulling the lever to move the holding mechanism away from the microswitch arm, which returns the microswitch arm to normal position to reset the signal;

7. The subminiature gas density relay according to claim 6, wherein the restoring means comprises a spring, and the restoring means is capable of restoring the restoring mechanism by an elastic force or a tensile force of the spring of the restoring means after the restoring mechanism is operated.

8. The subminiature gas density relay of claim 1, further comprising a non-removable verification device, the undetachable checking device is fixed on the chassis or on the shell or on the joint, the undetachable checking device is communicated with the air inlet hole of the chassis and the connector on the air path, the undetachable checking device consists of a valve and a checking port, the density relay can be shut off from the air chamber inside the electrical equipment on the air path by closing the valve without disassembly, the verification of the density relay is completed through the verification port, or, the valve of the non-detachable checking device is connected with the checking port without detaching, when the check joint and the check port are connected, the valve is automatically closed, so that the density relay is disconnected with an air chamber in the electrical equipment on an air path, and the check of the density relay is completed;

9. The subminiature gas density relay of claim 1, wherein the display mechanism further comprises a display temperature compensation element, the display temperature compensation element being a compensation device filled with a compensation gas.

10. The subminiature gas density relay of claim 9, wherein the display temperature compensation element is a bimetal, and the bimetal and a compensation gas in a sealed gas chamber of the display mechanism together provide temperature compensation for the display mechanism.

11. The subminiature gas density relay according to claim 9, wherein the compensating means filled with the compensating gas is a display compensating bourdon tube filled with the compensating gas, or the compensating means filled with the compensating gas is a display compensating bellows filled with the compensating gas, and further comprising a thermal bulb, the compensating gas being connected to the thermal bulb through a connecting gas tube.

12. The subminiature gas density relay of claim 2, further comprising: the wire outlet seat is provided with a vibration-avoiding piece, the wire outlet seat is fixed on the vibration-avoiding piece, and the vibration-avoiding piece is fixed on the chassis or the shell.

13. The subminiature gas density relay of claim 12, wherein the vibration absorbing member is a bellows or a thin plate with vibration absorbing function.

14. The subminiature gas density relay according to claim 1 or 12, wherein the wire outlet of the wire outlet is connected to the micro-switch and the wire outlet of the wire outlet is connected to a wire holder or a cable outside the housing.

15. The subminiature gas density relay according to claim 1, wherein the indication mechanism is fully sealed in the display window, so that the indication is displayed as absolute pressure and is not affected by altitude, the front surface of the display window is made of transparent glass, and the display window is fixedly connected with the chassis through a sealing ring.

16. The subminiature gas density relay of claim 1 or 3, further comprising: the inflation pipe arranged on the chassis or the shell can be filled with corresponding compensation gas through the inflation pipe.

17. The subminiature gas density relay according to claim 1 or 2, further comprising an inlet port disposed on the chassis or housing, wherein the connector is connected to the inlet port via a connector or a gas tube or directly to the inlet port.

18. The subminiature gas density relay according to claim 1 or 2, further comprising a gas inlet disposed on the base plate, wherein the connector is connected to the gas inlet, wherein the sealed gas chamber is filled with a compensation gas, wherein the display base is fixed to the base plate through a connecting pipe or directly, and wherein the display base is in gas communication with the connector.

19. The subminiature gas density relay of claim 1, wherein the micro-switch further comprises an actuating arm, wherein the holding mechanism holds the actuating arm after the signal is actuated, the holding mechanism can maintain the signal actuated state regardless of a decrease or an increase in pressure or density, the signal can be reset only by the reset mechanism, the actuating arm is an elastic member, and when the set pressure or density is reached, the adjusting member pushes the actuating arm of the micro-switch to move, so that the actuating arm of the micro-switch passes over the holding mechanism, and the actuating arm of the micro-switch is in the signal actuated state.

20. The subminiature gas density relay according to claim 1, wherein the reset mechanism is sealed to the housing, wherein the chamber of the housing is always sealed during operation of the reset mechanism, and wherein the reset mechanism is sealed to the housing by a sealing ring.

21. The subminiature gas density relay according to claim 1 or 8, wherein the proof mass is fused to the connector without disassembly.