Dial assembly for gas density relay and gas density relay

Abstract

The present invention discloses a dial assembly for a gas density relay and a gas density relay. The dial assembly includes a pointer, a movement and a dial body. The outer periphery of the dial body has an arc scale. One end of the pointer is rotatably connected to the dial body through a rotating shaft, and the other end of the pointer faces the arc scale. The movement is connected to the rotating shaft. The dial assembly also includes a first electrode and a connected arc resistor, a second electrode and a connected conductive sheet. The arc resistor and the conductive sheet are connected through a conductive component on the pointer. The dial assembly also includes a signal detection component, which is used to monitor the electrical parameters between the first electrode and the second electrode, and send the detected electrical parameters to the remote transmission component of the gas density relay to obtain the corresponding scale number pointed to by the other end of the pointer. The remote transmission gas density value of the gas density relay with such a dial assembly is consistent with the gas density value indicated by the pointer, thereby improving the accuracy of the detection data.

Description

Technical Field

[0001] The invention relates to the technical field of gas density detection, and in particular to a dial assembly for a gas density relay and a gas density relay. Background Art

[0002] The role of gas density relay in high-voltage electrical equipment is arc extinguishing and insulation. In the electrical field, gas density relay is widely used in power departments and industrial and mining enterprises. With the development of science and technology, gas density relay is gradually developing in the direction of digitalization, requiring gas density relay to have remote control and telemetry functions.

[0003] In the prior art, gas density relays generally use mechanical meters and electronic sensors to use gas density signals respectively, and the mechanical part and the electronic part are separated and independent. Therefore, the remote readings are not completely consistent with the readings on the mechanical meter, and there are deviations. In the prior art, there are also gas density relays that directly collect mechanical meter readings. For example, a Chinese patent document (publication number CN202614631U) discloses a pointer density relay that directly detects pointer deflection. This relay is equipped with a magnet at the end of the pointer, and directly detects the pointer deflection angle through a non-contact magnetic angle encoder. However, this method of transmitting data by electromagnetic means is susceptible to electromagnetic interference under complex working conditions, thereby affecting the accuracy of the transmitted data. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that the gas density relay adopts separate mechanical and electronic parts, so that the remote reading is not completely consistent with the reading on the mechanical meter, and there is a deviation, and the electromagnetic transmission of data is easily subject to electromagnetic interference.

[0005] In order to solve the above technical problems, an embodiment of the present invention discloses a dial assembly for a gas density relay, which includes a pointer, a movement and a dial body. The outer periphery of the dial body has an arc-shaped scale. One end of the pointer is rotatably connected to the dial body through a shaft, and the other end of the pointer faces the arc-shaped scale. The movement is transmission-connected to the shaft, so that the shaft drives the pointer to rotate within the scale range of the arc-shaped scale.

[0006] The dial assembly also includes a first electrode, a second electrode, an arc-shaped resistor and a conductive sheet spaced apart from the arc-shaped resistor. One end of the arc-shaped resistor is connected to the first electrode, and one end of the conductive sheet is connected to the second electrode.

[0007] A conductive component is fixedly connected to one side of the pointer close to the arc-shaped scale, and the conductive component has a first contact portion and a second contact portion.

[0008] Among them, the first contact portion is slidingly connected to the arc-shaped resistor, the second contact portion is slidingly connected to the conductive sheet, the first electrode, the access resistance segment of the arc-shaped resistor, the conductive component, the access conductive segment of the conductive sheet and the second electrode are sequentially connected in series and electrically connected, wherein the access resistance segment of the arc-shaped resistor is: the resistance segment in the arc-shaped resistor located between the first electrode and the first contact portion of the conductive component, and the access conductive segment of the conductive sheet is: the conductive segment in the conductive sheet located between the second electrode and the second contact portion of the conductive component.

[0009] In addition, the dial assembly also includes a signal detection component, which is connected to the first electrode and the second electrode. The signal detection component is used to monitor the electrical parameters between the first electrode and the second electrode, and send the detected electrical parameters to the remote transmission component of the gas density relay to confirm the rotation angle of the pointer relative to the initial scale in the arc scale based on the electrical parameters.

[0010] By adopting the above technical solution, when the dial assembly for the gas density relay is in use, the on-site personnel can directly obtain the density value of the gas according to the scale number of the arc scale on the dial body of the pointer. Since the arc resistor is connected to the conductive sheet through the conductive component on the pointer, the access resistance section of the arc resistor corresponds to the rotation angle of the pointer relative to the initial scale. Therefore, the electrical parameters collected by the signal detection component correspond to the rotation angle of the pointer relative to the initial scale, and because the rotation angle of the pointer relative to the initial scale corresponds to the scale value on the arc scale indicated by the other end of the pointer, according to the correspondence between the three, the terminal can obtain the scale number indicated by the other end of the pointer by processing the electrical parameters detected by the signal detection component. Therefore, the remotely transmitted gas density value of the dial assembly of this gas density meter has a high consistency with the gas density value shown by the pointer, thereby improving the accuracy of the detection data.

[0011] In addition, the dial assembly of the gas density relay cleverly sets the arc resistor to correspond to the arc scale of the dial. It only needs to collect the electrical parameters in the circuit composed of the first electrode, the arc resistor, the conductive member, the conductive sheet and the second electrode to obtain the rotation angle of the pointer relative to the initial scale. Compared with the prior art, which transmits data by electromagnetic means, this structure in this embodiment is not affected by external electromagnetic interference, is more stable, and has lower cost.

[0012] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the electrical parameter includes at least one of a voltage signal, a current signal, and a resistance signal.

[0013] The current signal includes the current information between the first electrode and the second electrode; the voltage signal includes the voltage information of the connected resistance section of the arc resistor; and the resistance signal includes the resistance information of the connected resistance section of the arc resistor.

[0014] By adopting the above technical solution, as the pointer rotates, the conductive component slides in a direction parallel to the arc scale, thereby changing the connection position between the first contact portion and the arc resistor, so that the access resistance segment of the arc resistor corresponds to the rotation angle of the pointer relative to the initial scale, that is, the voltage signal, current signal, and resistance signal in the loop formed between the first electrode and the second electrode can change. The signal detection component only needs to collect any one of the signals and compare it with the predetermined corresponding relationship to obtain the rotation angle of the pointer relative to the initial scale in the arc scale.

[0015] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the corresponding relationship between the rotation angle of the pointer relative to the initial scale and the resistance information is:

[0016] α=(2*R*S) / (ρ*D)

[0017] Wherein, α is the rotation angle of the pointer relative to the initial scale, R is the resistance value of the access resistance segment of the arc resistor, S is the cross-sectional area of ​​the arc resistor, ρ is the resistivity of the arc resistor, and D is the diameter of the arc resistor.

[0018] By adopting the above technical solution, since the resistance values ​​of the conductive sheet and the electrode are extremely small and can be ignored, the electrical parameters of the first electrode and the second electrode detected by the signal detection component are the resistance values ​​of the access resistance segment of the arc resistor. The rotation angle of the pointer relative to the initial scale can be obtained more accurately through the above correspondence.

[0019] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the corresponding relationship between the rotation angle of the pointer relative to the initial scale and the scale number of the arc scale indicated by the other end of the pointer on the dial body is:

[0020] N=α / γ*M

[0021] Among them, N is the scale number pointed by the other end of the pointer on the dial body, γ is the angle of the arc scale, and M is the range value of the arc scale.

[0022] By adopting the above technical scheme, when the dial assembly for the gas density relay is in use, the remote transmission component of the gas density relay calculates the rotation angle of the pointer according to the corresponding relationship between the rotation angle of the pointer relative to the initial scale and the scale number of the arc scale indicated by the other end of the pointer on the dial body, and then obtains the scale number indicated by the other end of the pointer, so that a person at a remote end can obtain the scale number on the arc scale of the other end of the pointer.

[0023] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the conductive component comprises a mounting arm and a connecting arm, wherein one end of the mounting arm is connected to a side of a pointer close to an arc scale, and the other end is connected to the connecting arm.

[0024] Two ends of the connecting arm form a first contact portion and a second contact portion respectively.

[0025] By adopting the above technical solution, the conductive fixture is connected to the pointer through the mounting arm, and the two ends of the connecting arm are respectively connected to the arc resistor and the conductive sheet, so that the arc resistor and the conductive sheet are conductive. When the pointer rotates, the contact positions of the two ends of the connecting arm with the arc resistor and the conductive sheet change accordingly, so that the access resistance segment of the arc resistor and the access conductive segment of the conductive sheet change.

[0026] An embodiment of the present invention further discloses a dial assembly for a gas density relay, which also includes an annular fixed disk, on which a first electrode, a second electrode, an arc resistor and a conductive sheet are all arranged, and the arc resistor and the conductive sheet are spaced apart in the radial direction of the fixed disk.

[0027] The first electrode is connected to the end of the arc resistor close to the initial scale of the arc scale, the conductive sheet is set to an arc structure corresponding to the arc resistor, and the second electrode is connected to the end of the conductive sheet close to the initial scale of the arc scale.

[0028] With the above technical solution, the surface of the fixed disk is used to fix various electrical components, and the central space of the annular fixed disk facilitates the connection between the pointer and the movement below the dial body. In addition, the conductive sheet with this arc structure can ensure that no matter how the pointer rotates to any angle, the second contact portion of the connecting arm can be stably connected to the corresponding position on the conductive sheet. Because the first electrode and the second electrode are respectively arranged at one end of the arc resistor and the conductive sheet close to the initial scale of the arc scale, as the pointer rotates along the direction of the arc scale, the access resistance segment of the arc resistor and the access conductive segment of the conductive sheet increase, and the resistance value of the conductive sheet is very small and can be ignored, so the resistance value change of the access resistance segment of the arc resistor is the resistance change in the loop.

[0029] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the fixed disk is fixedly arranged on a side of the dial body away from the pointer.

[0030] An arc-shaped groove is formed on the dial body at a position corresponding to the arc-shaped resistor, and the mounting arm of the conductive component is matched with the arc-shaped groove on the dial body.

[0031] With the above technical solution, one end of the mounting arm of the conductive member is connected to the pointer above the dial body and is mounted in the arc groove on the dial body, so that the other end of the mounting arm extends to the bottom of the dial body and is connected to the connecting arm. In addition, the arc groove on the dial body guides the movement of the mounting arm, ensuring that when the pointer rotates along the arc scale direction, the mounting arm can move along the track of the arc groove with the rotation of the pointer, avoiding the shaking of the mounting arm, thereby ensuring the connection stability between the first contact portion and the second contact portion on the connecting arm and the corresponding arc resistor and the conductive sheet.

[0032] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the movement comprises a driven gear, a sector tooth, an intermediate shaft and a movement disk, wherein the movement disk is arranged on a side of the fixed disk away from the dial body, the driven gear is sleeved on the rotating shaft, the driven gear is meshed with the sector tooth, and one end of the sector tooth away from the rotating shaft is rotatably connected to the movement disk;

[0033] The movement disk is provided with a strip hole matched with the intermediate shaft, and the intermediate shaft is installed on the movement disk through the strip hole. One end of the intermediate shaft has a setting needle extending in the radial direction, and the setting needle abuts against one side of the sector tooth. The other end of the intermediate shaft has a driven part extending in the radial direction, and the driven part and the setting needle are staggered in the radial direction.

[0034] By adopting the above technical solution, the dial assembly for the gas density relay is assembled on the gas density relay, and the driven part is connected to the measuring part in a transmission manner. When the density of the gas changes, the driven part is pushed by the measuring part, thereby causing the intermediate shaft to rotate along its axial direction, and the dial needle on the intermediate shaft drives the sector teeth, and the sector teeth rotate around the end away from the rotating shaft, driving the meshing driven gear, so that the pointer rotates around the rotating shaft in the direction of the arc scale, and the scale number indicated by the other end of the pointer is the density value of the gas.

[0035] The embodiment of the present invention further discloses a dial assembly for a gas density relay, wherein the dial body is extended in radial directions on both sides of the arc-shaped scale to form a connecting portion, and a plurality of connecting holes are provided on the connecting portion.

[0036] By adopting the above technical solution, the dial body is assembled on the housing of the gas density relay through the connecting parts on both sides, thereby ensuring its assembly stability in the gas density relay.

[0037] An embodiment of the present invention also discloses a gas density relay, including an air pressure measuring cavity, a transmission shaft and a remote transmission component. A connecting port is provided at one end of the air pressure measuring cavity, and one end of the transmission shaft extends into the air pressure measuring cavity through the connecting port. The gas density relay also includes any one of the above-mentioned dial assemblies for the gas density relay.

[0038] The other end of the transmission shaft is transmission-connected to the movement, and the remote transmission component is electrically connected to the signal detection component of the dial assembly.

[0039] By adopting the above technical solution, when the gas density relay is in use, the gas to be measured is filled into the air pressure measuring cavity. Under the action of the air pressure in the cavity, the transmission shaft is pushed out of the air pressure measuring cavity and acts on the movement. The movement converts the movement of the transmission shaft into the rotation of the pointer, so that the pointer rotates around the rotating axis along the direction of the arc scale. People on site can directly obtain the density value of the gas based on the scale number of the arc scale on the dial body. The terminal can obtain the scale number indicated by the other end of the pointer by processing the electrical parameters detected by the signal detection component.

[0040] The embodiment of the present invention further discloses a gas density relay, which further includes a transmission block and a micro switch. The transmission block is arranged on the transmission shaft, and the micro switch is arranged on a side of the transmission block away from the dial body.

[0041] When the gas pressure in the air pressure measuring cavity is lower than a preset value, the transmission block abuts against the micro switch.

[0042] With the above technical solution, the transmission shaft moves as the gas pressure in the gas measurement chamber changes, driving the transmission block to move. When the gas pressure in the pressure measurement chamber is lower than the preset value, the density of the gas to be measured no longer meets the use requirements, thus posing a safety hazard. The transmission block abuts against the micro switch, which disconnects after detecting the transmission block, triggering the warning component inside the gas density relay, thereby generating an alarm signal to remind people to take action.

[0043] The beneficial effects of the present invention are:

[0044] The present invention discloses a dial assembly for a gas density relay and a gas density relay. The dial assembly includes a pointer, a movement and a dial body. The outer periphery of the dial body has an arc scale. One end of the pointer is rotatably connected to the dial body through a rotating shaft, and the other end of the pointer faces the arc scale. The movement is connected to the rotating shaft. The dial assembly also includes a first electrode and a connected arc resistor, a second electrode and a connected conductive sheet, and the arc resistor and the conductive sheet are connected through a conductive member on the pointer. The dial assembly also includes a signal detection component, which is connected to the first electrode and the second electrode. The signal detection component is used to monitor the electrical parameters between the first electrode and the second electrode, and send the detected electrical parameters to the remote transmission component of the gas density relay.

[0045] When the dial assembly for the gas density relay is in use, the on-site personnel can directly obtain the gas density value according to the scale number of the arc scale of the pointer on the dial body. Since the electrical parameters collected by the signal detection component correspond to the rotation angle of the pointer relative to the initial scale, and because the rotation angle of the pointer relative to the initial scale corresponds to the scale value on the arc scale indicated by the other end of the pointer, the terminal can obtain the scale number indicated by the other end of the pointer by processing the electrical parameters detected by the signal detection component. Therefore, the remotely transmitted gas density value of the gas density relay with this dial assembly is completely consistent with the gas density value shown by the pointer, ensuring the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the structure of a gas density relay provided by an embodiment of the present invention;

[0047] Figure 2 A schematic structural diagram of a dial body of a dial assembly for a gas density relay provided in an embodiment of the present invention;

[0048] Figure 3 A schematic structural diagram of a first electrode, a second electrode and other electrical components of a dial assembly for a gas density relay provided in an embodiment of the present invention;

[0049] Figure 4 A schematic structural diagram of a movement of a dial assembly for a gas density relay provided in an embodiment of the present invention;

[0050] Figure 5 Another structural schematic diagram of a dial body of a dial assembly for a gas density relay provided in an embodiment of the present invention;

[0051] Figure 6 A working diagram of a dial assembly for a gas density relay provided by an embodiment of the present invention;

[0052] Figure 7 This is a working flow chart of a gas density relay provided in an embodiment of the present invention.

[0053] Description of reference numerals:

[0054] 10. Gas density relay;

[0055] 100. Dial assembly for gas density relay;

[0056] 110. Pointer;

[0057] 111, shaft;

[0058] 120, movement;

[0059] 121, driven gear; 122, sector gear; 123, intermediate shaft; 124, movement plate; 125, needle;

[0060] 126. driven part;

[0061] 130, dial body;

[0062] 131, arc scale; 132, arc groove; 133, connecting part; 134, connecting hole;

[0063] 140, first electrode; 150, second electrode; 160, arc resistor; 170, conductive sheet;

[0064] 180. Conductive member;

[0065] 181, first contact portion; 182, second contact portion; 183, mounting arm; 184, connecting arm;

[0066] 190, fixed plate;

[0067] 200, air pressure measuring cavity; 300, transmission shaft; 400, transmission block; 500, micro switch;

[0068] α, the rotation angle of the pointer relative to the initial scale;

[0069] γ, the angle of the arc scale;

[0070] D. The diameter of the arc resistor. DETAILED DESCRIPTION

[0071] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0072] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0073] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0075] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0076] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0077] like Figure 1-Figure 5 As shown, an embodiment of the present invention discloses a dial assembly 100 for a gas density relay, the dial assembly comprising a pointer 110, a movement 120 and a dial body 130, the outer periphery of the dial body 130 having an arc scale 131, one end of the pointer 110 being rotatably connected to the dial body 130 via a rotating shaft 111, the other end of the pointer 110 facing the arc scale 131, the movement 120 being transmission-connected to the rotating shaft 111, so that the rotating shaft 111 drives the pointer 110 to rotate within the scale range of the arc scale 131.

[0078] More specifically, the angle of the arc scale 131 can be 120°, 160°, 180°, or 240°. Preferably, in this embodiment, the angle of the arc scale 131 is 240°. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make any specific limitations on this.

[0079] Specifically, Figure 3 As shown, the dial assembly also includes a first electrode 140 , a second electrode 150 , an arc resistor 160 , and a conductive sheet 170 spaced apart from the arc resistor 160 , one end of the arc resistor 160 is connected to the first electrode 140 , and one end of the conductive sheet 170 is connected to the second electrode 150 .

[0080] More specifically, the first electrode 140 and the second electrode 150 are connected to an external power supply so that the circuit is energized. The first electrode 140 and the second electrode 150 can be metal sheets with good conductivity such as silver or copper. Those skilled in the art can design according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0081] More specifically, the conductive sheet 170 may be an iron sheet, a copper sheet, or a conductive structure made of a conductive material with low resistance commonly used in the art, which is not specifically limited in this embodiment.

[0082] More specifically, Figure 3 As shown, in one embodiment, the arc resistor 160 includes an arc structure made of a metal material with high resistance, and of course also includes an alloy material formed by mixing multiple metals such as nickel-chromium alloy, nickel-chromium, nickel-chromium-iron or iron-chromium-aluminum in a certain proportion. This embodiment does not make any specific limitations on this.

[0083] In another embodiment, the arc resistor 160 includes a metal rod and a resistance wire wound on the metal rod. The resistance wire can be a nickel-chromium alloy with a high melting point and high resistance, and the metal rod is made of a metal with low resistance. When the cross-sectional area of ​​the resistor is constant, the longer the resistance wire, the greater the resistance, and the shorter the resistance wire, the smaller the resistance. Then, by changing the length of the resistance wire connected to the circuit, the resistance value of the loop changes. The specific structure of the arc resistor 160 can be designed by those skilled in the art according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0084] More specifically, Figure 3 As shown, a conductive component 180 is fixedly connected to one side of the pointer 110 close to the arc-shaped scale 131 , and the conductive component 180 has a first contact portion 181 and a second contact portion 182 .

[0085] Among them, the first contact portion 181 is slidingly connected to the arc resistor 160, the second contact portion 182 is slidingly connected to the conductive sheet 170, the first electrode 140, the access resistance segment of the arc resistor 160, the conductive component 180, the access conductive segment of the conductive sheet 170 and the second electrode 150 are sequentially connected in series and electrically connected, wherein the access resistance segment of the arc resistor 160 is: the resistance segment in the arc resistor 160 located between the first electrode 140 and the first contact portion 181 of the conductive component 180, and the access conductive segment of the conductive sheet 170 is: the conductive segment in the conductive sheet 170 located between the second electrode 150 and the second contact portion 182 of the conductive component 180.

[0086] In addition, the dial assembly 100 for the gas density relay also includes a signal detection component (not shown in the figure), which is connected to the first electrode 140 and the second electrode 150. The signal detection component is used to monitor the electrical parameters between the first electrode 140 and the second electrode 150, and send the detected electrical parameters to the remote transmission component of the gas density relay 10 to confirm the rotation angle of the pointer 110 relative to the initial scale in the arc scale 131 based on the electrical parameters.

[0087] More specifically, Figure 6 As shown, when the dial assembly for the gas density relay is in use, the movement 120 drives the pointer 110 to rotate around the rotating shaft 111 in the direction of the arc scale 131, and the personnel on site can directly obtain the density value of the gas according to the scale number of the arc scale 131 on the dial body 130 of the pointer 110. Since the arc resistor 160 is connected to the conductive sheet 170 through the conductive member 180 on the pointer 110, the first contact portion 181 and the second contact portion 182 of the conductive member 180 on the pointer 110 slide along the arc resistor 160 and the conductive sheet 170 respectively, and the connected resistance section of the arc resistor 160 corresponds to the rotation angle of the pointer 110 relative to the initial scale. Therefore, the electrical parameters collected by the signal detection component correspond to the rotation angle of the pointer 110 relative to the initial scale, and because the rotation angle of the pointer 110 relative to the initial scale corresponds to the scale value on the arc scale 131 indicated by the other end of the pointer 110, according to the correspondence between the three, the terminal can obtain the scale number indicated by the other end of the pointer 110 by processing the electrical parameters detected by the signal detection component. Therefore, the remote gas density value of the dial assembly of this gas density meter is completely consistent with the gas density value shown by the pointer 110, ensuring the accuracy of the data.

[0088] In addition, the dial assembly of the gas density relay cleverly arranges the arc resistor 160 to correspond to the arc scale 131 of the dial, and the rotation angle of the pointer 110 relative to the initial scale can be obtained by only collecting the electrical parameters in the circuit composed of the first electrode 140, the arc resistor 160, the conductive member 180, the conductive sheet 170 and the second electrode 150. Compared with the prior art, which transmits data by electromagnetic means, this structure is not affected by external electromagnetic interference, is more stable, and has lower cost.

[0089] Furthermore, an embodiment of the present invention also discloses a dial assembly 100 for a gas density relay, wherein the electrical parameter includes at least one of a voltage signal, a current signal, and a resistance signal.

[0090] Specifically, the current signal includes current information between the first electrode 140 and the second electrode 150 ; the voltage signal includes voltage information of the connected resistance segment of the arc resistor 160 ; and the resistance signal includes resistance information of the connected resistance segment of the arc resistor 160 .

[0091] More specifically, in one embodiment, the signal detection component includes an ammeter. At this time, the first electrode 140 and the second electrode 150 are connected to an external power supply and the voltage between the two is constant. The current information between the first electrode 140 and the second electrode 150 is collected by the ammeter, and the resistance value in the circuit is calculated according to Ohm's first law.

[0092] In another embodiment, the signal detection component includes a voltmeter. At this time, the first electrode 140 and the second electrode 150 are connected to an external power supply and the current between the two is constant. The current information between the first electrode 140 and the second electrode 150 is collected by the voltmeter, and the resistance value in the circuit is calculated according to Ohm's first law.

[0093] In yet another embodiment, the signal detection component includes an ohmmeter. In this case, the ohmmeter directly collects the resistance value between the first electrode 140 and the second electrode 150 .

[0094] More specifically, as the pointer 110 rotates, the conductive component 180 slides in a direction parallel to the arc scale 131, thereby changing the connection position between the first contact portion 181 and the arc resistor 160, so that the access resistance segment of the arc resistor 160 corresponds to the rotation angle of the pointer 110 relative to the initial scale, that is, the voltage signal, current signal, and resistance signal in the loop formed between the first electrode 140 and the second electrode 150 can change. The signal detection component only needs to collect any one of the signals and compare it with the predetermined corresponding relationship to obtain the rotation angle of the pointer 110 relative to the initial scale in the arc scale 131.

[0095] Furthermore, an embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, wherein the corresponding relationship between the rotation angle of the pointer 110 relative to the initial scale and the resistance information is:

[0096] α=(2*R*S) / (ρ*D)

[0097] Specifically, Figure 5 As shown, α is the rotation angle of the pointer 110 relative to the initial scale, R is the resistance value of the access resistance segment of the arc resistor 160, S is the cross-sectional area of ​​the arc resistor 160, ρ is the resistivity of the arc resistor 160, and D is the diameter of the arc resistor 160.

[0098] More specifically, according to the definition formula of resistance, R=ρ*L / SR′, where L is the length of the arc resistor 160, and the length L of the arc resistor 160 is consistent with the length of the arc scale 131; R′ is the resistance of the conductive sheet 170. Since the resistance values ​​of the conductive sheet 170 and the electrode are extremely small and can be ignored, it can be deduced that L=R*S / ρ, and L=α / 2π*D*π=α*D / 2, so R*S / ρ=α*D / 2, and then the corresponding relationship between the rotation angle of the pointer 110 relative to the initial scale and the resistance information can be obtained.

[0099] Therefore, the electrical parameters detected by the signal detection component of the first electrode 140 and the second electrode 150 are the resistance values ​​of the access resistance segments of the arc resistor 160 . The rotation angle of the pointer 110 relative to the initial scale can be obtained more accurately through the above correspondence.

[0100] More specifically, in this embodiment, the arc resistor 160 is made of nickel-chromium alloy, whose resistivity is 1.0×10 ohm·meter (Ω·m), the diameter D of the arc resistor 160 is 5 centimeters (cm), and the cross-sectional area S of the arc resistor 160 is 0.2 square centimeters (cm 2 Those skilled in the art may determine the corresponding parameters according to the specific structure of the arc-shaped resistor 160, and this embodiment does not limit this.

[0101] Furthermore, an embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, wherein the corresponding relationship between the rotation angle of the pointer 110 relative to the initial scale and the scale number of the arc scale 131 pointed to by the other end of the pointer 110 on the dial body 130 is:

[0102] N=α / γ*M

[0103] Specifically, N is the scale number pointed to by the other end of the pointer 110 on the dial body 130 , γ is the angle of the arc scale 131 , and M is the range value of the arc scale 131 .

[0104] More specifically, in the present embodiment, the angle γ of the arc scale 131 is 240°, and the range value M of the arc scale 131 is 1 MPa (megapascal). Those skilled in the art can design according to actual conditions and specific needs, and the present embodiment does not specifically limit this. It should be noted that density refers to the mass of a specific substance per unit volume under certain conditions. However, for gas, both mass and volume are not easy to measure. Therefore, people derive from the ideal gas state equation and the definition of density to derive a method of characterizing the density of the gas by measuring the gas pressure value. The indication values ​​of density meters currently produced and used at home and abroad are all based on the unit of pressure MPa.

[0105] More specifically, when the dial assembly 100 for the gas density relay is in use, the remote transmission component of the gas density relay 10 calculates the rotation angle of the pointer 110 based on the correspondence between the rotation angle of the pointer 110 relative to the initial scale and the scale number of the arc scale 131 indicated by the other end of the pointer 110 on the dial body 130, and then obtains the scale number indicated by the other end of the pointer 110, so that a person at a remote end can obtain the scale number of the other end of the pointer 110 on the arc scale 131.

[0106] Furthermore, the embodiment of the present invention also discloses a dial assembly 100 for a gas density relay, such as Figure 5 As shown, the conductive component 180 includes a mounting arm 183 and a connecting arm 184 . One end of the mounting arm 183 is connected to a side of the pointer 110 close to the arc scale 131 , and the other end is connected to the connecting arm 184 .

[0107] More specifically, the mounting arm 183 can be a columnar structure made of insulating materials such as plastic, ceramic or wood and extending along the thickness direction of the dial body 130. Such a mounting arm 183 can prevent the current from being transmitted to the pointer 110 through the mounting arm 183, thereby causing a short circuit.

[0108] Specifically, Figure 3 As shown, the connecting arm 184 is a bent sheet structure made of a conductive metal material, and the two ends of the connecting arm 184 respectively form a first contact portion 181 and a second contact portion 182. The first contact portion 181 and the second contact portion 182 are specifically configured as a point-shaped conductive structure formed by copper or silver welding. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0109] More specifically, the conductive fixture is connected to the pointer 110 via the mounting arm 183, and the two ends of the connecting arm 184 are respectively connected to the arc resistor 160 and the conductive sheet 170, so that the arc resistor 160 and the conductive sheet 170 are conductive. When the pointer 110 rotates, the contact positions of the two ends of the connecting arm 184 with the arc resistor 160 and the conductive sheet 170 change, so that the access resistance segment of the arc resistor 160 and the access conductive segment of the conductive sheet 170 change.

[0110] Furthermore, if Figure 3 As shown, an embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, the dial assembly also includes an annular fixed disk 190, the first electrode 140, the second electrode 150, the arc resistor 160 and the conductive sheet 170 are all arranged on the fixed disk 190, and the arc resistor 160 and the conductive sheet 170 are spaced apart in the radial direction of the fixed disk 190.

[0111] Specifically, in this embodiment, the first electrode 140 is connected to one end of the arc resistor 160 close to the initial scale of the arc scale 131, the conductive sheet 170 is set to an arc structure corresponding to the arc resistor 160, and the second electrode 150 is connected to one end of the conductive sheet 170 close to the initial scale of the arc scale 131.

[0112] More specifically, the second electrode 150 may also be connected to an end of the conductive sheet 170 away from the initial scale of the arc scale 131 .

[0113] In another embodiment, the first electrode 140 is connected to the initial end of the arc resistor 160 away from the arc scale 131. When the pointer 110 points to the initial scale of the arc scale 131, the arc resistor 160 is fully connected to the loop. As the pointer 110 rotates around the arc scale 131, the connected resistance segment of the arc resistor 160 gradually decreases, and the resistance value is inversely proportional to the rotation angle of the pointer 110.

[0114] More specifically, the surface of the fixed disk 190 is used to fix various electrical components, and the central space of the annular fixed disk 190 facilitates the connection between the pointer 110 and the movement 120 below the dial body 130. In addition, the conductive sheet 170 of this arc structure can ensure that no matter to which angle the pointer 110 is rotated, the second contact portion 182 of the connecting arm 184 can be stably connected to the corresponding position on the conductive sheet 170. Because the first electrode 140 and the second electrode 150 are respectively arranged at one end of the arc resistor 160 and the conductive sheet 170 close to the initial scale of the arc scale 131, as the pointer 110 rotates along the direction of the arc scale 131, the connected resistance segment of the arc resistor 160 and the connected conductive segment of the conductive sheet 170 increase, and the resistance value of the conductive sheet 170 is very small and can be ignored, so the resistance value change of the connected resistance segment of the arc resistor 160 is the resistance change in the loop.

[0115] Furthermore, if Figure 1 As shown, the embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, wherein a fixed plate 190 is fixedly disposed on a side of the dial body 130 away from the pointer 110 .

[0116] Specifically, Figure 2 As shown, an arc-shaped groove 132 is formed on the dial body 130 at a position corresponding to the arc-shaped resistor 160 , and the mounting arm 183 of the conductive component 180 is matched with the arc-shaped groove 132 on the dial body 130 .

[0117] More specifically, one end of the mounting arm 183 of the conductive member 180 is connected to the pointer 110 above the dial body 130, and is mounted in the arc groove 132 on the dial body 130, so that the other end of the mounting arm 183 extends to the bottom of the dial body 130 and is connected to the connecting arm 184. In addition, the arc groove 132 on the dial body 130 guides the movement of the mounting arm 183, ensuring that when the pointer 110 rotates along the arc scale 131, the mounting arm 183 can move along the track of the arc groove 132 with the rotation of the pointer 110, thereby preventing the mounting arm 183 from shaking, thereby ensuring the connection stability between the first contact portion 181 and the second contact portion 182 on the connecting arm 184 and the corresponding arc resistor 160 and the conductive sheet 170.

[0118] Furthermore, if Figure 4 As shown, an embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, wherein the movement 120 includes a driven gear 121, sector teeth 122, an intermediate shaft 123 and a movement disk 124, wherein the movement disk 124 is disposed on a side of the fixed disk 190 away from the dial body 130, and the driven gear 121 is sleeved on the rotating shaft 111, and the driven gear 121 is meshed with the sector teeth 122, and one end of the sector teeth 122 away from the rotating shaft 111 is rotatably connected to the movement disk 124.

[0119] Specifically, Figure 4 As shown, the movement disk 124 is provided with a strip hole matched with the intermediate shaft 123, and the intermediate shaft 123 is installed on the movement disk 124 through the strip hole. One end of the intermediate shaft 123 has a setting needle 125 extending in the radial direction, and the setting needle 125 abuts against one side of the sector tooth 122. The other end of the intermediate shaft 123 has a driven part 126 extending in the radial direction. The driven part 126 and the setting needle 125 are staggered in the radial direction.

[0120] More specifically, the driven portion 126 may be a rod-shaped structure extending radially along the intermediate shaft 123 . Those skilled in the art may design it according to actual conditions and specific requirements, and this embodiment does not make any specific limitation to this.

[0121] More specifically, the dial assembly 100 for the gas density relay is mounted on the gas density relay 10, and the driven part 126 is connected to the measuring component in a transmission manner. When the density of the gas changes, the driven part 126 is pushed by the measuring component, thereby causing the intermediate shaft 123 to rotate along its axial direction, and the dial pin 125 on the intermediate shaft 123 dials the sector tooth 122, and the sector tooth 122 rotates around its end away from the rotating shaft 111, driving the meshing driven gear 121, so that the pointer 110 rotates around the rotating shaft 111 in the direction of the arc scale 131, and the scale number indicated by the other end of the pointer 110 is the density value of the gas. It should be noted that the transmission ratio between the sector tooth 122 and the driven gear 121 can be designed by those skilled in the art according to actual conditions and specific needs to form different magnifications, so as to facilitate the amplification of the slight rotation of the intermediate shaft 123, thereby causing the pointer 110 to rotate a larger angle.

[0122] Furthermore, if Figure 2 As shown, the embodiment of the present invention further discloses a dial assembly 100 for a gas density relay, wherein the dial body 130 extends radially along both sides of the arc scale 131 to form a connecting portion 133, and the connecting portion 133 is provided with a plurality of connecting holes 134. It should be noted that, in order to facilitate the identification of the drawings, only one of the multiple identical components in the drawings is numbered.

[0123] More specifically, Figure 2 As shown, in this embodiment, two connecting holes 134 are provided on the connecting parts 133 on both sides, and the dial body 130 is fixed by bolts. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make specific limitations on this.

[0124] Specifically, the dial body 130 is assembled on the housing of the gas density relay 10 through the connecting parts 133 on both sides, so as to ensure its assembly stability in the gas density relay 10 .

[0125] The embodiment of the present invention also discloses a gas density relay 10, such as Figure 1 As shown, it includes a pressure measuring cavity 200, a transmission shaft 300 and a remote transmission component (not shown in the figure), one end of the pressure measuring cavity 200 is provided with a connection port, and one end of the transmission shaft 300 extends into the pressure measuring cavity 200 through the connection port. The gas density relay 10 also includes any one of the above-mentioned dial assemblies 100 for gas density relays. Among them, the remote transmission component can send the electrical parameters collected by the signal detection component to the terminal through a wired or wireless signal transmission method. The terminal can be a computer, a tablet or a mobile phone, etc., and this embodiment does not specifically limit this.

[0126] Specifically, the other end of the transmission shaft 300 is transmission-connected to the movement 120 , and the remote transmission component is electrically connected to the signal detection component of the dial assembly.

[0127] More specifically, the gas density relay 10 is mainly used to monitor and display the density of sulfur hexafluoride (SF6) gas in a sealed container, and is generally used in high-voltage circuit breakers, disconnectors, transformers, lightning arresters, gas insulated switchgear (GIS), etc. that use SF6 gas for insulation or arc extinguishing. Those skilled in the art also need to know that the gas density relay 10 is not limited to measuring the above-mentioned gas, but can also be used to detect the density of other gases.

[0128] More specifically, the air pressure measuring cavity 200 of the gas density relay 10 can measure the density of the gas by means of a Bourdon tube, a bellows or a diaphragm box. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make any specific limitations on this.

[0129] More specifically, when the gas density relay 10 is in use, the gas to be measured is filled into the air pressure measuring cavity 200. Under the action of the air pressure in the cavity, the transmission shaft 300 is pushed out of the air pressure measuring cavity 200 and acts on the movement 120. The movement 120 converts the movement of the transmission shaft 300 into the rotation of the pointer 110, so that the pointer 110 rotates around the rotating shaft 111 along the direction of the arc scale 131. People on site can directly obtain the density value of the gas based on the scale number of the arc scale 131 on the dial body 130 of the pointer 110. The terminal can obtain the scale number indicated by the other end of the pointer 110 by processing the electrical parameters detected by the signal detection component.

[0130] Furthermore, an embodiment of the present invention also discloses a gas density relay 10, which also includes a transmission block 400 and a micro switch 500. The transmission block 400 is arranged on the transmission shaft 300, and the micro switch 500 is arranged on a side of the transmission block 400 away from the dial body 130.

[0131] More specifically, Figure 1 As shown, a circuit board (not shown in the figure) is arranged below the micro switch 500, the micro switch 500 is electrically connected to the circuit board, the circuit board receives the position information of the transmission block 400 collected by the micro switch 500, and controls the alarm component to give an alarm. The specific model and specification of the circuit board can be designed by those skilled in the art according to the actual situation and specific needs, and this embodiment does not specifically limit this.

[0132] Specifically, Figure 7As shown, when the gas pressure in the air pressure measurement cavity 200 is lower than the preset value, the transmission block 400 abuts against the micro switch 500, and the gas density relay sends an alarm signal. Among them, those skilled in the art can set the preset value according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0133] More specifically, Figure 7 As shown, the transmission shaft 300 moves with the change of the gas pressure in the air pressure measurement cavity 200, driving the transmission block 400 to move. When the gas pressure in the air pressure measurement cavity 200 is lower than the preset value, at this time, the density of the gas to be measured no longer meets the use requirements, so there is a safety hazard. The transmission block 400 abuts against the micro switch 500. After the micro switch 500 detects the transmission block 400, the position information of the transmission block 400 is sent to the circuit board in the form of an electrical signal. The circuit board controls the alarm component (not shown in the figure) inside the gas density relay 10 to generate an alarm signal to remind people to handle it. Specifically, the alarm component can be a warning light or a buzzer, which is not specifically limited in this embodiment.

[0134] In summary, the present invention discloses a dial assembly for a gas density relay and a gas density relay. When the gas density relay 10 is in use, sulfur hexafluoride, the gas to be measured, is filled into the air pressure measuring cavity 200. Under the action of the air pressure, the transmission shaft 300 pushes the driven portion 126 of the intermediate shaft 123, so that the intermediate shaft 123 rotates axially, and the dial pin 125 on the intermediate shaft 123 dials the sector teeth 122, so that the sector teeth 122 drive the driven gear 121 to rotate, and then drives the pointer 110 to rotate.

[0135] At this time, the people on site can obtain the density value of the gas according to the scale number indicated by the other end of the pointer 110 on the arc scale 131. At the same time, when the pointer 110 rotates along the arc scale 131 around the rotating shaft 111, the position of the conductive member 180 on the pointer 110 changes, so that the contact position of the first contact portion 181 and the second contact portion 182 with the arc resistor 160 and the conductive sheet 170 changes, the access resistance segment of the arc resistor 160 and the access conductive segment of the conductive sheet 170 change, and the electrical parameters between the first electrode 140 and the second electrode 150 collected by the signal detection component change. The signal detection component sends the collected electrical parameters to the remote transmission component of the gas density relay 10. The remote transmission component confirms the rotation angle of the pointer 110 relative to the initial scale in the arc scale 131 according to the electrical parameters of the signal detection component, and then obtains the scale number indicated by the other end of the pointer 110 according to the rotation angle of the pointer 110, so that the terminal can obtain the density value of the gas.

[0136] Furthermore, when this gas density relay 10 is in use, when the gas pressure in the air pressure measuring chamber 200 drops to a preset value, the transmission block 400, driven by the transmission shaft 300, approaches the micro switch 500. After the micro switch detects the transmission block 400, it sends the position information of the transmission block 400 to the circuit board in the form of an electrical signal. The circuit board controls the warning component inside the gas density relay 10, thereby generating an alarm signal to remind people to take action.

[0137] Compared with the gas density relays with independent mechanical and electronic parts in the prior art, the gas density relay 10 can improve the consistency of terminal data and field data, reduce the error between the two, and has good anti-magnetic field interference capability. In addition, the gas density relay 10 has a simple structure and low cost.

[0138] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A dial assembly for a gas density relay, the dial assembly comprising a pointer, a movement and a dial body, the outer periphery of the dial body having an arc scale, one end of the pointer being rotatably connected to the dial body via a rotating shaft, the other end of the pointer facing the arc scale, the movement being transmission-connected to the rotating shaft, so that the rotating shaft drives the pointer to rotate within the scale range of the arc scale; characterized in that: The dial assembly further includes a fixed disk, a first electrode, a second electrode, an arc-shaped resistor and a conductive sheet spaced apart from the arc-shaped resistor, one end of the arc-shaped resistor is connected to the first electrode, and one end of the conductive sheet is connected to the second electrode; The movement comprises a driven gear, sector teeth, an intermediate shaft and a movement plate, wherein the movement plate is arranged on a side of the fixed plate away from the dial body, the driven gear is sleeved on the rotating shaft, the driven gear is meshed with the sector teeth, and one end of the sector teeth away from the rotating shaft is rotatably connected to the movement plate; The movement disk is provided with a strip hole matched with the intermediate shaft, and the intermediate shaft is installed on the movement disk through the strip hole. One end of the intermediate shaft has a setting needle extending in the radial direction, and the setting needle abuts against one side of the sector tooth. The other end of the intermediate shaft has a driven part extending in the radial direction, and the driven part and the setting needle are staggered along the radial direction. A conductive member is fixedly connected to the side of the pointer close to the arc scale, and the conductive member has a first contact part and a second contact part; wherein, The first contact portion is slidably connected to the arc-shaped resistor, the second contact portion is slidably connected to the conductive sheet, the first electrode, the access resistance segment of the arc-shaped resistor, the conductive member, the access conductive segment of the conductive sheet, and the second electrode are sequentially connected in series and electrically connected, wherein the access resistance segment of the arc-shaped resistor is: the resistance segment of the arc-shaped resistor located between the first electrode and the first contact portion of the conductive member, the access conductive segment of the conductive sheet is: the conductive segment of the conductive sheet located between the second electrode and the second contact portion of the conductive member; and, The dial assembly also includes a signal detection component, which is connected to the first electrode and the second electrode. The signal detection component is used to monitor the electrical parameters between the first electrode and the second electrode, and send the detected electrical parameters to the remote transmission component of the gas density relay to confirm the rotation angle of the pointer relative to the initial scale in the arc scale based on the electrical parameters.

2. The dial assembly for a gas density relay according to claim 1, characterized in that: The electrical parameter includes at least one of a voltage signal, a current signal, and a resistance signal; wherein, The current signal includes current information between the first electrode and the second electrode; The voltage signal includes voltage information of the access resistance segment of the arc resistor; The resistance signal includes resistance information of the access resistance segment of the arc resistor.

3. The dial assembly for a gas density relay according to claim 2, characterized in that: The corresponding relationship between the rotation angle of the pointer relative to the initial scale and the resistance information is: α=(2*R*S) / (ρ*D) Wherein, α is the rotation angle of the pointer relative to the initial scale, R is the resistance value of the access resistance segment of the arc resistor, S is the cross-sectional area of ​​the arc resistor, ρ is the resistivity of the arc resistor, and D is the diameter of the arc resistor.

4. The dial assembly for a gas density relay according to claim 3, characterized in that: The corresponding relationship between the rotation angle of the pointer relative to the initial scale and the scale number of the arc scale pointed by the other end of the pointer on the dial body is: N=α / γ*M Wherein, N is the scale number pointed by the other end of the pointer on the dial body, γ is the angle of the arc scale, and M is the range value of the arc scale.

5. The dial assembly for a gas density relay according to claim 1, characterized in that: The conductive component comprises a mounting arm and a connecting arm, one end of the mounting arm is connected to a side of the pointer close to the arc scale, and the other end is connected to the connecting arm; Two ends of the connecting arm form the first contact portion and the second contact portion respectively.

6. The dial assembly for a gas density relay according to claim 5, characterized in that: The dial assembly further includes a ring-shaped fixed disk, and the arc-shaped resistor and the conductive sheet are spaced apart in the radial direction of the fixed disk; wherein, The first electrode is connected to one end of the arc resistor close to the initial scale of the arc scale, the conductive sheet is set to an arc structure corresponding to the arc resistor, and the second electrode is connected to one end of the conductive sheet close to the initial scale of the arc scale.

7. The dial assembly for a gas density relay according to claim 6, characterized in that: The fixed plate is fixedly arranged on a side of the dial body away from the pointer; An arc-shaped groove is formed on the dial body at a position corresponding to the arc-shaped resistor, and the mounting arm of the conductive component is matched with the arc-shaped groove on the dial body.

8. The dial assembly for a gas density relay according to any one of claims 1 to 7, characterized in that: The dial body is extended in radial directions on both sides of the arc-shaped scale to form a connecting portion, and a plurality of connecting holes are provided on the connecting portion.

9. A gas density relay, comprising a pressure measuring cavity, a transmission shaft and a remote transmission component, wherein one end of the pressure measuring cavity is provided with a connection port, and one end of the transmission shaft extends into the pressure measuring cavity through the connection port, characterized in that: The gas density relay further comprises a dial assembly for a gas density relay as claimed in any one of claims 1 to 8; The other end of the transmission shaft is transmission-connected to the movement, and the remote transmission component is electrically connected to the signal detection component of the dial assembly.

10. The gas density relay according to claim 9, characterized in that: The gas density relay further comprises a transmission block and a micro switch, wherein the transmission block is arranged on the transmission shaft, and the micro switch is arranged on a side of the transmission block away from the dial body; When the gas pressure in the air pressure measuring cavity is lower than a preset value, the transmission block abuts against the micro switch.

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