Gas density relay with multiple pairs of contacts

Abstract

The utility model provides a gas density relay with multiple pairs of contacts, each static contact arm is paired with a corresponding movable contact arm to form multiple paths of independent switch contacts, a measuring corrugated pipe can drive a trigger piece to move, so that the trigger piece triggers a corresponding microswitch to act, each microswitch forms an additional switch contact, and the relay is convenient to use. Therefore, through the electric contact switch assembly and the density switch assembly, multiple pairs of contacts can be flexibly configured, and when the density of the gas to be detected changes, the switch signal is output through the electric contact switch assembly or the density switch assembly, so that monitoring of different levels of gas density is met, and the requirements of customers for output of different density signals are met.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a gas density relay with multiple connection points. Background Technology

[0002] In power systems, density relays (or gas density relays) are critical protection devices used to monitor changes in the density of insulating gases (such as SF6) in high-voltage switchgear (such as GIS and circuit breakers). Their core function is to detect changes in gas pressure and temperature to determine if there are leaks or abnormalities in the equipment, and to trigger corresponding contact signals to drive alarm or trip circuits, thereby ensuring the safe operation of power equipment.

[0003] Currently, most density relays on the market employ a mechanical pressure sensing structure, using elastic elements such as bellows and Baden tubes to convert changes in gas pressure into mechanical displacement, thereby driving contact action. However, existing products have the following limitations:

[0004] (1) Insufficient number of contacts: Traditional density relays are generally only configured with 2-3 contacts (such as alarm contacts, interlock contacts, and overpressure contacts), which cannot meet the needs of some users for multiple signal outputs. For example, it is necessary to output low-density first-level alarm, second-level alarm, and interlock signals at the same time; or to add additional function contacts such as pressure abnormality early warning and remote communication trigger.

[0005] (2) Poor expandability: Due to the limited mechanical structure design, the internal space of the existing meter is small, making it difficult to directly add more contact groups. If forced modification is carried out, it may lead to a decrease in the accuracy of the action or a reduction in reliability.

[0006] (3) Diversified customer needs: With the development of smart grid, users have increasingly complex functional requirements for density relays, such as: needing to distinguish different levels of leakage alarms (such as minor leakage warning and severe leakage tripping); needing to support multi-level protection logic (such as linkage with temperature compensation and environmental pressure correction). Utility Model Content

[0007] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a gas density relay with multiple contact points, so as to solve the technical problems such as insufficient number of contact points in the density relay in the prior art.

[0008] To achieve the above objectives, this utility model provides a gas density relay with multiple connection points for installation on the gas chamber of external electrical equipment, comprising:

[0009] A gas piping assembly, wherein the gas piping assembly is connected to the gas chamber of the external electrical equipment;

[0010] A drive assembly, the drive assembly including a Bourdon tube and a movement assembly connected to one end of the Bourdon tube; the other end of the Bourdon tube is connected to the gas pipeline assembly;

[0011] An electrical contact switch assembly includes multiple stationary contact arms and a movable contact arm corresponding to each of the stationary contact arms; the movable contact arm is connected to the mechanism assembly and can be driven by the mechanism assembly to rotate between a non-triggered position and a triggered position, and the stationary contact arm is located on the rotation path corresponding to the movable contact arm; when the movable contact arm is in the triggered position, it contacts the stationary contact arm, causing the electrical contact switch assembly to output a corresponding switching signal;

[0012] A density switch assembly includes a measuring bellows with one open end and two or more microswitches. The open end of the measuring bellows is connected to the gas chamber of an external electrical device through a gas pipeline assembly. The other end of the measuring bellows is provided with a trigger corresponding to the microswitch. The measuring bellows can drive the trigger to move, and the microswitch is located on the movement path of the trigger. The trigger triggers the corresponding microswitch to act, causing the density switch assembly to output a corresponding switching signal.

[0013] As a preferred embodiment, each stationary contact arm is provided with a stationary contact point, and the moving contact arm is provided in correspondence with the stationary contact point, with the stationary contact point located on the rotation path of the corresponding moving contact arm.

[0014] In a preferred embodiment, the density switch assembly further includes a compensation bellows closed at both ends and a connecting rod for connecting the measuring bellows and the compensation bellows; the micro switch is disposed between the measuring bellows and the compensation bellows.

[0015] As a preferred embodiment, the other end of the measuring bellows is provided with a cover plate, and the trigger element is disposed on the cover plate.

[0016] In a preferred embodiment, the electrical contact switch assembly further includes multiple mounting brackets and multiple mounting bases, with the stationary contact arms fixed at intervals on the mounting brackets, the mounting bases fixed on the mounting brackets, and the movable contact arms rotatably mounted on the mounting bases.

[0017] In a preferred embodiment, the drive assembly further includes a pointer connected to the movement assembly, and a drive rod is provided on the pointer, which is connected to each of the movable contact arms respectively; the movement assembly can drive the pointer to rotate, and then drive the movable contact arms to rotate via the drive rod.

[0018] As a preferred embodiment, the drive assembly further includes a dial disposed at the starting end of the electrical contact switch assembly along the H direction.

[0019] In a preferred embodiment, the gas pipeline assembly includes a first connecting pipe, a mounting base, and a second connecting pipe; the mounting base has a first gas passage inside; one end of the first connecting pipe is connected to the first gas passage, and the other end of the first connecting pipe is connected to the gas chamber of the external electrical equipment; one end of the second connecting pipe is connected to the first gas passage, and the other end of the second connecting pipe is connected to the other end of the Bourdon tube; the end of the measuring bellows with an opening is connected to the first gas passage.

[0020] As a preferred embodiment, the other end of the first connecting pipe is provided with an air nozzle, which is used to install on the air chamber of the external electrical equipment.

[0021] As a preferred embodiment, the device also includes a base with a second gas channel formed inside. The other end of the Bourdon tube is connected to the gas pipeline assembly through the second gas channel, so that the gas to be tested in the gas chamber of the external electrical device enters the interior of the Bourdon tube sequentially through the gas pipeline assembly and the second gas channel.

[0022] As described above, the gas density relay with multiple contact points involved in this utility model is used to be installed on the gas chamber of an external electrical device to monitor the density of the gas to be measured in the gas chamber of the external electrical device. It has the following beneficial effects: the gas to be measured in the gas chamber of the external electrical device enters the interior of the Bourdon tube and the interior of the measuring bellows through the gas pipeline assembly. Each of the stationary contact arms is paired with the corresponding moving contact arm to form multiple independent switch contacts. The measuring bellows can drive the trigger element to move, so that the trigger element triggers the corresponding micro switch to act. Each of the micro switches forms additional switch contacts. Thus, multiple contact points can be flexibly configured through the electrical contact switch assembly and the density switch assembly. When the density of the gas to be measured changes, a switch signal is output through the electrical contact switch assembly or the density switch assembly to meet different levels of gas density monitoring and meet the customer's needs for different density signal outputs. Attached Figure Description

[0023] Figure 1 The diagram shown is a structural schematic of the gas density relay with multiple connection points according to this utility model.

[0024] Figure 2 The diagram shown is a structural schematic of the electrical contact switch assembly in the gas density relay with multiple contact points according to this invention.

[0025] Figure 3 The diagram shown is a structural schematic of the density switch assembly in the gas density relay with multiple connection points according to this utility model.

[0026] Figure 4 The diagram shown is an exploded view of the density switching assembly in the gas density relay with multiple docking points of this invention.

[0027] Figure 5 The diagram shown is a partial structural schematic of the gas density relay with multiple connection points according to this utility model.

[0028] Figure 6 The diagram shown is a partial structural schematic of the core assembly in the gas density relay with multiple connection points according to this invention.

[0029] Figure 7 The diagram shown is a schematic representation of the external structure of the gas density relay with multiple connection points according to this invention.

[0030] Figure 8 The image shown is a front view of the gas density relay with multiple docking points according to this invention.

[0031] Component designation explanation

[0032] 1. Gas piping assembly

[0033] 11 First connecting pipe

[0034] 111 Air valve

[0035] 12 Fixtures

[0036] 13 Second connecting pipe

[0037] 2. Driver Components

[0038] 21 Bourdon tube

[0039] 22 Movement components

[0040] 221 Movement pivot

[0041] 222 End seat

[0042] 223 Temperature compensation element

[0043] 224 First plywood

[0044] 225 Second plywood

[0045] 226 sector gears

[0046] 23 pointers

[0047] 231 Drive lever

[0048] 24 dial

[0049] 3 Electrical contact switch assembly

[0050] 31 Static contact arm

[0051] 311 static contact

[0052] 32 moving contact arms

[0053] 321 Hair spring

[0054] 33 Mounting bracket

[0055] 34 mounting brackets

[0056] 35 Insulating sheet

[0057] 36 bases

[0058] 4. Density switch assembly

[0059] 41 Measuring bellows

[0060] 411 Trigger

[0061] 412 Cover Plate

[0062] 42 Micro switch

[0063] 421 Pin 2

[0064] 422 Protective Housing

[0065] 43 Compensating bellows

[0066] 431 Top Cover

[0067] 432 bottom cover

[0068] 44 Connecting rod

[0069] 45 Switch housing

[0070] 5. Switch signal output component

[0071] 6. Base

[0072] 7. Housing assembly

[0073] 71 Upper casing

[0074] 72 Lower housing

[0075] 8 Mounting bolts Detailed Implementation

[0076] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0077] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terminology used herein is for describing specific embodiments only and is not intended to limit this application. Spatial terms such as "upper," "lower," "left," "right," "below," "below," "lower part," "above," "upper part," etc., may be used in the text to illustrate the relationship between one element or feature shown in the figures and another element or feature.

[0078] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "holding" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0079] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, operation, element, component, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, or operations are inherently mutually exclusive in some manner.

[0080] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0081] like Figure 1-8 As shown, this utility model provides a gas density relay with multiple connection points for installation on the gas chamber of external electrical equipment, comprising:

[0082] Gas piping assembly 1, wherein the gas piping assembly 1 is connected to the gas chamber of the external electrical equipment;

[0083] The drive assembly 2 includes a Bourdon tube 21 and a movement assembly 22 rotatably connected to one end of the Bourdon tube 21; the other end of the Bourdon tube 21 is connected to the gas pipeline assembly 1.

[0084] An electrical contact switch assembly 3 includes a plurality of stationary contact arms 31 and a movable contact arm 32 corresponding to each of the stationary contact arms 31. The movable contact arm 32 is connected to the mechanism assembly 22 and can be driven by the mechanism assembly 22 to rotate between a non-triggered position and a triggered position. The stationary contact arms 31 are located on the rotation path of the corresponding movable contact arm 32. When the movable contact arm 32 is in the triggered position, it contacts the stationary contact arm 31, so that the electrical contact switch assembly 3 outputs a corresponding switching signal.

[0085] The density switch assembly 4 includes a measuring bellows 41 with one open end and two or more microswitches 42. One open end of the measuring bellows 41 is connected to the gas chamber of the external electrical equipment through the gas pipeline assembly 1. The other end of the measuring bellows 41 is provided with a trigger 411 corresponding to the microswitch 42. The measuring bellows 41 can drive the trigger 411 to move, and the microswitch 42 is located on the moving path of the trigger 411. The trigger 411 triggers the corresponding microswitch 42 to act, so that the density switch assembly 4 outputs a corresponding switching signal.

[0086] This utility model discloses a gas density relay with multiple contact points, which is installed on the gas chamber of an external electrical device to monitor the density of the gas to be measured in the gas chamber of the external electrical device. The gas to be measured in the gas chamber of the external electrical device enters the interior of the Bourdon tube 21 and the interior of the measuring bellows 41 through the gas pipeline assembly 1. The stationary contact arm 31 is paired with the corresponding moving contact arm 32 to form multiple independent switch contacts. The measuring bellows 41 can drive the trigger element 411 to move, so that the trigger element 411 triggers the corresponding micro switch 42 to act. Each micro switch 42 forms an additional switch contact. Thus, multiple contact points can be flexibly configured through the electrical contact switch assembly 3 and the density switch assembly 4. When the density of the gas to be measured changes, a switch signal is output through the electrical contact switch assembly 3 or the density switch assembly 4 to meet different levels of gas density monitoring and meet the customer's needs for different density signal outputs.

[0087] In this embodiment, as Figure 7 As shown, it also includes a switch signal output component 5, which has multiple first pins. Each pair of stationary contact arms 31 and moving contact arms 32 are electrically connected to the corresponding first pin via a data line. When the density of the gas to be measured changes, one end of the Bourdon tube 21 is displaced, causing the mechanism assembly 22 to move, which in turn causes the moving contact arm 32 to contact the corresponding stationary contact arm 31. The switch signal output by the electrical contact switch assembly 3 is transmitted to the external control device through the switch signal output component 5, causing the external control device to perform corresponding protection actions.

[0088] In this embodiment, as Figure 3 , 4 As shown, each microswitch 42 is provided with multiple second pins 421. The second pins 421 are connected to an external control device via a cable. When the density of the gas to be measured changes, the measuring bellows 41 deforms, causing the trigger 411 to move and trigger the corresponding microswitch 42 to act, so that the microswitch 42 outputs a corresponding switching signal and transmits it to the external control device, so that the external control device performs the corresponding protection action.

[0089] In this embodiment, as Figure 1 , 2As shown in Figure 5, each stationary contact arm 31 is provided with a stationary contact point 311, and the moving contact arm 32 is correspondingly provided with the stationary contact point 311. The stationary contact point 311 is located on the rotation path of the corresponding moving contact arm 32. The stationary contact point 311 includes a magnet. When the moving contact arm 32 rotates to the trigger position, the magnet contacts the moving contact arm 32, causing the electrical contact switch assembly 3 to output a corresponding switching signal. The fact that the stationary contact point 311 is a magnet is merely one embodiment of this utility model and is not intended to limit the scope of protection of this utility model.

[0090] In this embodiment, as Figure 1 , 2 As shown in Figure 5, the electrical contact switch assembly 3 further includes multiple mounting brackets 33 and multiple mounting seats 34. The stationary contact arms 31 are fixed at intervals on the mounting brackets 33, and the mounting seats 34 are fixed on the mounting brackets 33. The moving contact arms 32 are rotatably mounted on the mounting seats 34. Specifically, some of the mounting brackets 33 are used to fix the stationary contact arms 31, with one end of each stationary contact arm 31 fixed to a corresponding mounting bracket 33, and a stationary contact 311 located at the other end of the stationary contact arm 31. Other mounting brackets 33 each have a mounting seat 34, and each mounting seat 34 contains a mounting shaft. One end of the moving contact arm 32 is rotatably connected to the mounting shaft, allowing the moving contact arm 32 to rotate between a triggered position and a non-triggered position via the mounting shaft. The other end of the moving contact arm 32 is used to trigger the corresponding stationary contact 311. Each moving contact arm 32 is provided with a hairspring 321 between one end and the mounting shaft. The hairspring 321 can control the moving contact arm 32 to move from the trigger position to the non-trigger position when it is not driven. Or it can be understood that the hairspring 321 can enable the moving contact arm 32 to reset to the initial position after triggering the stationary contact 311.

[0091] In this embodiment, as Figure 1 , 2 As shown in Figure 5, the electrical contact switch assembly 3 further includes an insulating sheet 35. Multiple stationary contact arms 31 and multiple moving contact arms 32 are spaced apart along the direction H of the electrical contact switch assembly 3. Insulating sheets 35 are provided between adjacent stationary contact arms 31, between adjacent stationary contact arms 31 and moving contact arms 32, and between adjacent moving contact arms 32. The insulating sheet 35 serves as a physical spacing layer to prevent accidental conduction between contact arms, thus avoiding signal interference or short circuits.

[0092] In this embodiment, as Figure 1 , 2As shown in Figure 5, the electrical contact switch assembly 3 also includes a base 36, with insulating sheets 35 and mounting brackets 33 fixed on the base 36. Along the direction H of the electrical contact switch assembly 3, insulating sheets 35 are also provided between the first stationary contact arm 31 and the mounting bracket 33, and between the last moving contact arm 32 and the base 36. Each insulating sheet 35, mounting bracket 33, and base 36 has corresponding bolt holes, and long bolts are passed through the bolt holes in sequence to fix multiple insulating sheets 35 and mounting brackets 33 to the base 36.

[0093] In this embodiment, as Figure 3 , 4 As shown, the density switch assembly 4 also includes a compensation bellows 43 closed at both ends and a connecting rod 44 for connecting the measuring bellows 41 and the compensation bellows 43; the micro switch 42 is disposed between the measuring bellows 41 and the compensation bellows 43. The sealed inner cavity of the compensation bellows 43 is filled with a compensation gas with the same characteristics as the gas to be measured. When the ambient temperature changes, causing a change in the density of the gas to be measured, because the sealed inner cavity of the compensation bellows 43 is filled with a compensation gas with the same characteristics as the gas to be measured, the gas pressure on the sealed inner cavity of the compensation bellows 43 and the measuring inner cavity of the measuring bellows 41 is the same. The deformations of the compensation bellows 43 and the measuring bellows 41 cancel each other out, avoiding the situation where the micro switch 42 malfunctions due to changes in ambient temperature.

[0094] In this embodiment, as Figure 1-8 As shown, to better illustrate the gas density relay with multiple connection points of this utility model, the following embodiments are provided:

[0095] For example, the electrical contact switch assembly 3 includes three stationary contact arms 31 and three moving contact arms 32. Each stationary contact arm 31 has a stationary contact 311. The density switch assembly 4 has two microswitches 42 and two trigger elements 411, forming five contact points. In the initial state, the trigger element 411 is in contact with the microswitches 42. When the density of the gas to be measured decreases to a first preset threshold (e.g., 0.5 MPa), the stationary contact 311 on the first stationary contact arm 31 contacts the first moving contact arm 32 and outputs a low-density warning switch signal. When the density of the gas to be measured decreases to a second preset threshold (e.g., 0.48 MPa), the stationary contact 311 on the second stationary contact arm 31 contacts the second moving contact arm 32 and outputs a medium-density leakage warning switch signal. When the density of the gas to be measured decreases to a third preset threshold (e.g., 0.45 MPa), the stationary contact 311 on the third stationary contact arm 31 contacts the third moving contact arm 32 and outputs an emergency locking warning switch signal. When the density of the gas to be measured decreases to the fourth preset threshold (e.g., 0.43 MPa), the first trigger 411 separates from the first microswitch 42, the first microswitch 42 activates, and outputs a switch signal for a serious leak warning. When the density of the gas to be measured decreases to the fifth preset threshold (e.g., 0.4 MPa), the second trigger 411 separates from the second microswitch 42, the second microswitch 42 activates, and outputs a switch signal for an emergency isolation warning. Thus, by setting multiple pairs of stationary contact arms 31 and moving contact arms 32 and multiple microswitches 42, multiple contact points can be flexibly configured to meet customers' needs for multiple signal outputs, forming multi-level protection. Detection and triggering are performed for different gas density thresholds, with each threshold corresponding to a specific contact point or microswitch 42 activation, to achieve multi-density value alarm and triggering functions, thereby improving the reliability of the entire system.

[0096] In this embodiment, as Figure 3 , 4 As shown, a cover plate 412 is provided at the other end of the measuring bellows 41, and the trigger 411 is disposed on the cover plate 412. The trigger 411 includes trigger bolts, the number of which is the same as the number of micro switches 42. The cover plate 412 is provided with first mounting holes, the same number of which are provided with the trigger bolts. By adjusting the position of the trigger bolts in the first mounting holes, the tightness of contact between the trigger bolts and the micro switches 42 is adjusted to achieve alarm triggering at different thresholds.

[0097] In this embodiment, as Figure 3 , 4 As shown, the two ends of the compensating bellows 43 are provided with an upper cover 431 and a lower cover 432. The upper cover 431 and the lower cover 432 seal the two ends of the compensating bellows 43. One end of the connecting rod 44 is connected to the cover plate 412, and the other end is connected to the upper cover 431, so as to connect the measuring bellows 41 and the compensating bellows 43.

[0098] In this embodiment, as Figure 3 As shown, the micro switch 42 is fitted with a protective housing 422 to isolate external contaminants, prevent oxidation of the second pin 421, prevent external forces from directly impacting the micro switch 42, and improve the reliability of the micro switch 42.

[0099] In this embodiment, as Figure 7 As shown, the density switch assembly 4 also includes a switch housing 45, and the measuring bellows 41, the compensating bellows 43, the micro switch 42, and the connecting rod 44 are all disposed within the switch housing 45. Each micro switch 42 is fixed in the inner cavity of the switch housing 45 by mounting bolts 8. The switch housing 45, the protective housing 422, and the micro switch 42 are all provided with corresponding fixing holes. The mounting bolts 8 pass through the switch housing 45, the protective housing 422, and the micro switch 42 in sequence to fix the micro switch 42 in the inner cavity of the switch housing 45.

[0100] In this embodiment, as Figure 1 , 2 As shown in Figure 5, the drive assembly 2 further includes a pointer 23, which is connected to the mechanism assembly 22. A drive rod 231 is mounted on the pointer 23, and the drive rod 231 is connected to each of the moving contact arms 32. The mechanism assembly 22 can drive the pointer 23 to rotate, which in turn drives the moving contact arms 32 to rotate via the drive rod 231. Specifically, the drive rod 231 can follow the pointer 23 to rotate around a designated axis, causing the moving contact arm 32 to move from a non-triggered position to a triggered position, thereby triggering the stationary contact point 311 on the corresponding stationary contact arm 31. Thus, by utilizing the different gas density values ​​corresponding to each stationary contact point 311, multi-density value alarm and triggering functions can be achieved.

[0101] In this embodiment, as Figure 2 As shown, multiple stationary contact arms 31 are arranged in a stepped manner along the direction L of the electrical contact switch assembly 3, and the stationary contacts 311 are located at the same height. Moving contact arms 32 are connected to the drive rod 231 at intervals along its circumference and protrude from the drive rod 231. The length of the moving contact arm 32 protruding from the drive rod 231 is preferably such that its endpoint can trigger the corresponding stationary contact 311. This arrangement allows the moving contact arm 32 to sequentially trigger multiple stationary contacts 311 according to the rotation angle of the drive rod 231, thereby enabling the electrical contact switch assembly 3 to output different switching signals. It is worth noting that the rotation angle of the drive rod 231 is closely related to the rotation angle of the pointer 23, which in turn is affected by the change in gas volume within the Bourdon tube 21. Therefore, the rotation angle of the drive rod 231 is closely related to the change in gas volume within the Bourdon tube 21.

[0102] In this embodiment, as Figure 1 , 2 As shown in Figure 5, the driving component 2 also includes a dial 24, which is disposed at the starting end of the electrical contact switch component 3 along the H direction. The measured value of the gas to be measured is obtained when the pointer 23 rotates and aligns with the scale marked on the dial 24.

[0103] In this embodiment, as Figure 1 , 5 As shown in Figure 6, the movement assembly 22 includes a movement shaft 221, an end seat 222, a temperature compensation element 223, a first clamping plate 224, a second clamping plate 225 parallel to the first clamping plate 224, a central gear, and a sector gear 226 meshing with the central gear. The central gear is fixed on the movement shaft 221. The movement shaft 221 passes through the first clamping plate 224 and the second clamping plate 225 and is fixedly connected to both. The movement shaft 221 is fixedly connected to the pointer 23. One end of the end seat 222 is connected to one end of the Bourdon tube 21, and the other end of the end seat 222 is connected to one end of the temperature compensation element 223. The other end of the temperature compensation element 223 is rotatably connected to the sector gear 226. The first clamping plate 224 and the second clamping plate 225 support the entire movement assembly 22. When the density of the gas being measured changes, one end of the Bourdon tube 21 shifts, causing the temperature compensation element 223 to rotate via the end seat 222. This, in turn, drives the sector gear 226 to rotate. Through the meshing of the sector gear 226 and the central gear, the movement shaft 221 rotates, pushing the pointer 23 to rotate and display the measured value on the dial 24. During this process, the rotation of the pointer 23 drives the drive rod 231 to rotate, which in turn drives the moving contact arm 32 to rotate. When it rotates to the trigger position, it triggers the stationary contact point 311 on the corresponding stationary contact arm 31. The temperature compensation element 223 is used to correct for changes in pressure and temperature.

[0104] In this embodiment, as Figure 1 , 5 As shown, the Bourdon tube 21, also known as a bellows tube or spring tube, is a metal tube with one end open and closed. During operation, the open end of the Bourdon tube 21 is typically fixed. When the inner cavity of the Bourdon tube 21 is subjected to fluid pressure, the curvature of the tube changes, and the free end undergoes linear displacement. The Bourdon tube 21 converts the gas pressure change into a displacement change, thereby driving the internal mechanism assembly 22 to move and display the gas density.

[0105] In this embodiment, as Figure 1 , 5As shown in Figures 7 and 8, the gas pipeline assembly 1 includes a first connecting pipe 11, a fixing base 12, and a second connecting pipe 13. A first gas channel is provided inside the fixing base 12. One end of the first connecting pipe 11 is connected to the first gas channel, and the other end of the first connecting pipe 11 is connected to the gas chamber of the external electrical equipment. One end of the second connecting pipe 13 is connected to the first gas channel, and the other end of the second connecting pipe 13 is connected to the other end of the Bourdon tube 21. The end of the measuring bellows 41 with an opening is connected to the first gas channel. The first connecting pipe 11 and the second connecting pipe 13 are used to transport the gas to be measured from the gas chamber of the external electrical equipment.

[0106] In this embodiment, as Figure 7 , 8 As shown, the fixed base 12 is provided with a second mounting hole, a third mounting hole, and a fourth mounting hole. The second mounting hole, the third mounting hole, and the fourth mounting hole are respectively connected to the first gas channel. One end of the first connecting pipe 11 is connected to the second mounting hole, one end of the second connecting pipe 13 is connected to the third mounting hole, and one end of the measuring bellows 41 with an opening is connected to the fourth mounting hole, so that the gas to be measured enters the interior of the Bourdon tube 21 and the measuring cavity of the measuring bellows 41 respectively.

[0107] In this embodiment, as Figure 1 , 7 As shown in Figure 8, the other end of the first connecting pipe 11 is provided with an air nozzle 111, which is used to be installed on the air chamber of the external electrical equipment.

[0108] In this embodiment, as Figure 1 , 5 As shown, it also includes a base 6, inside which a second gas channel is formed. The other end of the Bourdon tube 21 is connected to the gas pipeline assembly 1 through the second gas channel, so that the gas to be tested in the gas chamber of the external electrical equipment enters the interior of the Bourdon tube 21 sequentially through the gas pipeline assembly 1 and the second gas channel. The other end of the Bourdon tube 21 is connected to the other end of the second connecting pipeline 13 through the second gas channel.

[0109] In this embodiment, as Figure 1 , 5As shown, the second gas channel extends to one end of the base 6, and one end of the base 6 is connected to the other end of the second connecting pipe 13. The base 6 is provided with a fifth mounting hole, which communicates with the second gas channel. The other end of the Bourdon tube 21 is connected to the second gas channel through the fifth mounting hole. The gas to be tested enters the interior of the Bourdon tube 21 sequentially through the first connecting pipe 11, the first gas channel, the second connecting pipe 13, and the second gas channel.

[0110] In this embodiment, as Figure 7 , 8 As shown, it also includes a housing assembly 7, which includes an upper housing 71 and a lower housing 72. The drive assembly 2 and the electrical contact switch assembly 3 are both disposed in the accommodating cavity formed by the upper housing 71 and the lower housing 72.

[0111] In summary, the gas density relay with multiple connection points of this invention has the following advantages:

[0112] (1) Improved measurement accuracy and reliability: The arrangement of multiple stationary contact arms 31, moving contact arms 32, and multiple microswitches 42 enables detection and triggering for different gas density thresholds. Each threshold corresponds to a specific contact or microswitch 42 action, making the measurement results more accurate and reducing the possibility of misjudgment and missed judgment, thereby improving the reliability of the entire system. For example, different preset thresholds correspond to different degrees of gas density change, which can reflect subtle changes in gas density in a timely and accurate manner, providing a reliable basis for subsequent protection actions.

[0113] (2) Multiple protection mechanisms to improve system reliability: The combination of stationary contact arm 31, moving contact arm 32 and micro switch 42 forms a multi-level protection system.

[0114] (3) Flexible configuration to adapt to various scenarios: Multiple contact points can be flexibly configured through the electrical contact switch assembly 3 and the density switch assembly 4. By adjusting the preset threshold and the number and layout of the static contact arm 31, the moving contact arm 32 and the micro switch 42, the needs of different devices for gas density monitoring can be met.

[0115] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0116] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A gas density relay with multiple mating points, for installation on the gas chamber of external electrical equipment, characterized in that, include: Gas piping assembly (1), the gas piping assembly (1) being connected to the gas chamber of the external electrical equipment; The drive assembly (2) includes a Bourdon tube (21) and a movement assembly (22) connected to one end of the Bourdon tube (21); the other end of the Bourdon tube (21) is connected to the gas pipeline assembly (1). An electrical contact switch assembly (3) includes a plurality of stationary contact arms (31) and a movable contact arm (32) corresponding to each of the stationary contact arms (31); the movable contact arm (32) is connected to the mechanism assembly (22), the movable contact arm (32) can be driven by the mechanism assembly (22) to rotate between a non-trigger position and a trigger position, and the stationary contact arm (31) is located on the rotation path corresponding to the movable contact arm (32), the movable contact arm (32) contacts the stationary contact arm (31) when in the trigger position, so that the electrical contact switch assembly (3) outputs a corresponding switch signal; The density switch assembly (4) includes a measuring bellows (41) with one open end and a micro switch (42). The number of micro switches (42) is two or more. One open end of the measuring bellows (41) is connected to the gas chamber of the external electrical equipment through the gas pipeline assembly (1). The other end of the measuring bellows (41) is provided with a trigger (411) corresponding to the micro switch (42). The measuring bellows (41) can drive the trigger (411) to move, and the micro switch (42) is located on the moving path of the trigger (411). The trigger (411) triggers the corresponding micro switch (42) to act, so that the density switch assembly (4) outputs a corresponding switch signal.

2. The gas density relay with multiple connection points according to claim 1, characterized in that, Each stationary contact arm (31) is provided with a stationary contact point (311), and the moving contact arm (32) is provided in correspondence with the stationary contact point (311). The stationary contact point (311) is located on the rotation path of the corresponding moving contact arm (32).

3. The gas density relay with multiple connection points according to claim 1, characterized in that, The density switch assembly (4) further includes a compensation bellows (43) with both ends closed and a connecting rod (44) for connecting the measuring bellows (41) and the compensation bellows (43); the micro switch (42) is disposed between the measuring bellows (41) and the compensation bellows (43).

4. The gas density relay with multiple connection points according to claim 1, characterized in that, The other end of the measuring bellows (41) is provided with a cover plate (412), and the trigger (411) is provided on the cover plate (412).

5. The gas density relay with multiple connection points according to claim 1, characterized in that, The electrical contact switch assembly (3) also includes multiple mounting brackets (33) and multiple mounting seats (34). The stationary contact arms (31) are fixed at intervals on the mounting brackets (33), the mounting seats (34) are fixed on the mounting brackets (33), and the moving contact arms (32) are rotatably mounted on the mounting seats (34).

6. The gas density relay with multiple connection points according to claim 1, characterized in that, The drive assembly (2) further includes a pointer (23), which is connected to the mechanism assembly (22). The pointer (23) is provided with a drive rod (231), which is connected to each of the moving contact arms (32). The mechanism assembly (22) can drive the pointer (23) to rotate, and then drive the moving contact arms (32) to rotate through the drive rod (231).

7. The gas density relay with multiple connection points according to claim 6, characterized in that, The drive assembly (2) further includes a dial (24) disposed at the starting end of the electrical contact switch assembly (3) along the H direction.

8. The gas density relay with multiple connection points according to claim 1, characterized in that, The gas pipeline assembly (1) includes a first connecting pipe (11), a fixing seat (12), and a second connecting pipe (13); the fixing seat (12) has a first gas channel inside; one end of the first connecting pipe (11) is connected to the first gas channel, and the other end of the first connecting pipe (11) is connected to the gas chamber of the external electrical equipment; one end of the second connecting pipe (13) is connected to the first gas channel, and the other end of the second connecting pipe (13) is connected to the other end of the Bourdon tube (21); the measuring bellows (41) has an open end connected to the first gas channel.

9. The gas density relay with multiple connection points according to claim 8, characterized in that, The other end of the first connecting pipe (11) is provided with an air nozzle (111), which is used to be installed on the air chamber of the external electrical equipment.

10. The gas density relay with multiple connection points according to claim 1, characterized in that, It also includes a base (6), inside which a second gas channel is formed. The other end of the Bourdon tube (21) is connected to the gas pipeline assembly (1) through the second gas channel, so that the gas to be tested in the gas chamber of the external electrical equipment enters the interior of the Bourdon tube (21) in sequence through the gas pipeline assembly (1) and the second gas channel.

Images