Parallel gas density relay

Abstract

The present invention provides a parallel gas density relay for monitoring the pressure of the gas to be measured. One end of the measuring bellows is open and connected to the gas to be measured so that the gas to be measured flows into the measuring chamber. The measuring bellows and the compensating bellows are staggeredly connected. The pneumatic modules are connected in parallel with each other, the pressure-bearing modules are connected in parallel with each other, and the pneumatic modules and the pressure-bearing modules are connected in parallel with each other. When the pressure range of the monitored gas to be measured is large, the shells of the compensating bellows and the second pressure-bearing bellows share the pressure together, so that the compensating bellows and the second pressure-bearing bellows are deformed within the effective stroke; when the compensating gas pressure is large, the shells of the measuring bellows and the first pressure-bearing bellows share the pressure together, so that the measuring bellows and the first pressure-bearing bellows are deformed within the effective stroke, thereby expanding the measurement range of the parallel gas density relay and meeting the gas pressure measurement needs in a wider range.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment status monitoring, in particular to a parallel gas density relay. Background Art

[0002] In power systems, gas density relays are key devices used to monitor and control the density of insulating gases (such as SF6) in power equipment, such as circuit breakers. Because gas density directly impacts the insulation performance and arc-extinguishing capabilities of the equipment, gas density relays play a vital role in power systems. They monitor changes in gas density in real time and issue alarms or trigger protective actions when abnormal gas density is detected, thereby ensuring the safe operation of power equipment.

[0003] Circuit breakers are critical equipment in power transmission and distribution networks. Failures in circuit breakers can not only damage the equipment but also trigger widespread power outages, resulting in significant economic losses and social impact. Therefore, ensuring the long-term, stable, and reliable operation of circuit breakers is a crucial task in power system maintenance and management.

[0004] To achieve this goal, circuit breaker operating indicators must be continuously and closely monitored to ensure they comply with relevant standards. Gas density is a key parameter in circuit breaker operation; changes in gas density can indicate leaks, abnormal temperatures, or other potential issues within the equipment.

[0005] Currently, gas density relays primarily utilize two measurement methods: Bourdon tube and bellows. While Bourdon tube measurement has a long history of application, its accuracy and sensitivity are relatively limited. Bellows measurement, however, has gained widespread application in low-pressure measurement due to its higher accuracy and sensitivity. As a pressure-sensitive element, bellows accurately convert pressure changes into mechanical displacement, which is then output as an electrical signal through a transmission mechanism.

[0006] However, bellows-based measurement methods also have certain limitations. Due to the inherent characteristics of bellows, their measurement range is relatively small, typically no more than 0.3 MPa. Therefore, they are mainly used in low-pressure measurement applications, limiting their application in high-pressure measurement. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a parallel gas density relay for solving the technical problems of the prior art bellows-type gas density relay such as small measurement range and limited measurement range.

[0008] To achieve the above object, the present invention provides a parallel gas density relay for monitoring the pressure of a gas to be measured, comprising:

[0009] A pneumatic structure, the pneumatic structure includes at least one pneumatic module and at least one pressure-bearing module; the pneumatic module and the pressure-bearing module are connected in parallel with each other, and each of the pneumatic modules is connected in parallel with each other, and each of the pressure-bearing modules is connected in parallel with each other; the pneumatic module includes a measuring bellows with an opening at the bottom end and a compensating bellows sealed at both ends; a closed chamber is provided in the compensating bellows, and the closed chamber is filled with a compensating gas with the same characteristics as the gas to be measured; a measuring chamber is provided in the measuring bellows, the bottom end of the measuring bellows is connected to the gas to be measured so that the gas to be measured flows into the measuring chamber, and the measuring bellows and the compensating bellows are staggeredly connected; the pressure-bearing module includes a first pressure-bearing bellows sealed at both ends and a second pressure-bearing bellows sealed at both ends, the first pressure-bearing bellows and the second pressure-bearing bellows are staggeredly connected, the first pressure-bearing bellows and the measuring bellows are connected in parallel, and the second pressure-bearing bellows and the compensating bellows are connected in parallel;

[0010] A driving structure comprising a connecting assembly and a driving assembly disposed on the connecting assembly, wherein the measuring bellows is staggeredly connected to the compensating bellows via the connecting assembly; and the first pressure-bearing bellows is staggeredly connected to the second pressure-bearing bellows via the connecting assembly;

[0011] The indicating structure is connected to the driving assembly. When the pressure of the gas to be measured changes, each of the measuring bellows and each of the first pressure-bearing bellows is deformed, and the driving assembly is driven to move through the connecting assembly to push the indicating structure to rotate and indicate the gas pressure value.

[0012] As a preferred embodiment, the indicating structure includes a freely rotatable movement assembly and an indicating assembly rotatably connected to the movement assembly, wherein the movement assembly is arranged above the driving assembly and contacts the top of the driving assembly; the indicating assembly includes a pointer and a dial arranged between the movement assembly and the pointer, and the pointer is rotatably connected to the movement assembly.

[0013] As a preferred embodiment, it further comprises a pressure signal acquisition module, which is arranged in one of the measurement chambers to acquire the pressure signal of the gas to be measured.

[0014] As a preferred embodiment, the device further includes a circuit board, which is electrically connected to the pressure signal acquisition module to transmit the pressure signal collected by the pressure signal acquisition module to the outside.

[0015] As a preferred embodiment, the connecting assembly includes a first connecting plate and a second connecting plate arranged in parallel, and a support tube for connecting the first connecting plate and the second connecting plate, the bottom end of the compensating bellows is connected to the first connecting plate, the top end of the measuring bellows is connected to the second connecting plate, the top end of the first pressure-bearing bellows is connected to the second connecting plate, and the bottom end of the second pressure-bearing bellows is connected to the first connecting plate, the first connecting plate is set at a higher position than the bottom ends of the measuring bellows and the first pressure-bearing bellows, and the second connecting plate is set at a lower position than the top ends of the compensating bellows and the second pressure-bearing bellows, thereby achieving height misalignment between the measuring bellows and the compensating bellows, and height misalignment between the first pressure-bearing bellows and the second pressure-bearing bellows.

[0016] As a preferred embodiment, it also includes a shell structure, which includes an outer shell, an upper cover arranged on the top of the outer shell and a lower cover arranged on the bottom of the outer shell, and the pneumatic structure and the connecting assembly are all arranged in an accommodating inner cavity formed by the outer shell, the upper cover and the lower cover; the bottom of the lower cover is provided with a gas nozzle for communicating with the gas to be measured; the measuring bellows in each of the pneumatic modules have an open bottom end respectively connected to the gas nozzle, and the bottom end of the first pressure-bearing bellows in each of the pressure-bearing modules is respectively connected to the lower cover; the top end of the compensating bellows in each of the pneumatic modules is respectively fixedly connected to the upper cover, and the top end of the second pressure-bearing bellows in each of the pressure-bearing modules is respectively fixedly connected to the upper cover, so as to connect each of the pneumatic modules in parallel, the pressure-bearing module and the pneumatic module in parallel, and each of the pressure-bearing modules in parallel.

[0017] As a preferred embodiment, the driving assembly includes a linear driving rod and a sliding block, one end of the linear driving rod is connected to the connecting assembly, and the other end is connected to the sliding block; the movement assembly is arranged above the sliding block and contacts the top of the sliding block.

[0018] As a preferred embodiment, a first through hole is provided on the upper cover, one end of the linear drive rod passes through the first through hole and is connected to the connecting assembly and can move up and down in the first through hole, and the other end is connected to the sliding block.

[0019] As a preferred embodiment, it also includes an alarm structure, which is arranged below the sliding block and located on the moving path of the sliding block; when the pressure of the gas to be measured changes, the measuring bellows and the first pressure-bearing bellows are deformed, and the sliding block is driven to move away from or closer to the alarm structure through the connecting component.

[0020] As a preferred embodiment, the driving structure further includes a triggering component for triggering the alarm structure. The triggering component is arranged on the driving component, and the driving component can drive the triggering component to move, thereby triggering the alarm structure to operate.

[0021] As described above, the parallel gas density relay involved in the present invention is used to monitor the pressure of the gas to be measured, and has the following beneficial effects: the bottom end of the measuring bellows is open and connected to the gas to be measured, so that the gas to be measured flows into the measuring chamber. When the pressure of the gas to be measured changes, each measuring bellows and the first pressure-bearing bellows are deformed, driving the connecting component to move up and down, and driving the indicating structure to rotate through the driving component to indicate the gas pressure value. When the pressure range of the monitored gas to be measured is large, the shells of each compensating bellows and each second pressure-bearing bellows share the pressure together, so that each compensating bellows and each second pressure-bearing bellows are deformed within the effective stroke, and when the compensating gas pressure is large, the shells of each measuring bellows and each first pressure-bearing bellows share the pressure together, so that each measuring bellows and each first pressure-bearing bellows are deformed within the effective stroke, thereby expanding the measurement range of the parallel gas density relay and meeting the gas pressure measurement needs in a wider range. In addition, each pneumatic module and pressure-bearing module still adopts a high-precision bellows structure to ensure that high-precision measurement can be maintained within a large range. In addition, when the external ambient temperature changes and causes the pressure of the gas to be measured to change, since the closed chamber is filled with a compensating gas with the same properties as the gas to be measured, the closed chamber and the measuring chamber are subjected to the same gas pressure, and the deformation of the compensating bellows and the measuring bellows is offset, avoiding indication errors caused by changes in ambient temperature, ensuring that the measurement results are not affected by temperature, and allowing the parallel gas density relay to maintain stable measurement performance in an environment with large temperature fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic diagram of the overall structure of the parallel gas density relay of the present invention.

[0023] Figure 2 Shown is a schematic diagram of the pneumatic structure in the parallel gas density relay of the present invention.

[0024] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the parallel gas density relay of the present invention.

[0025] Figure 4 Shown is a schematic structural diagram of the parallel gas density relay of the present invention in remote transmission mode.

[0026] Figure 5Shown is a schematic diagram of the staggered connection of the bellows of the parallel gas density relay of the present invention.

[0027] Figure 6 Shown is a cross-sectional view of a parallel gas density relay according to the present invention.

[0028] Figure 7 Shown is a partial structural schematic diagram of the parallel gas density relay of the present invention.

[0029] Figure 8 Shown is another partial structural schematic diagram of the parallel gas density relay of the present invention.

[0030] Component number description

[0031] 1. Aerodynamic structure

[0032] 11 Pneumatic module

[0033] 111 Measuring bellows

[0034] 112 Compensating bellows

[0035] 12 pressure module

[0036] 121 First pressure-bearing bellows

[0037] 122 Second pressure-bearing bellows

[0038] 2 Drive structure

[0039] 21 Connecting Components

[0040] 211 First connecting plate

[0041] 212 Second connecting plate

[0042] 213 support tube

[0043] 22 drive components

[0044] 221 linear drive rod

[0045] 222 Slider

[0046] 2221 Adjustment hole

[0047] 3 Indicative structure

[0048] 31 Movement components

[0049] 311 movement support plate

[0050] 312 movement shaft

[0051] 3121 movement pins

[0052] 3122 movement push rod

[0053] 313 Gear Structure

[0054] 32 indicator components

[0055] 321 Pointer

[0056] 322 dial

[0057] 4. Pressure signal acquisition module

[0058] 5. Circuit Board

[0059] 6 Shell structure

[0060] 61 housing

[0061] 62 Upper cover

[0062] 63 lower cover

[0063] 631 gas nozzle

[0064] 7 Alarm Structure

[0065] 8 Backstage Computer

[0066] 9 Signal transmission line DETAILED DESCRIPTION

[0067] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0068] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is only limited by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial-related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0069] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," "fixed," and "holding" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0070] 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 "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude 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" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0071] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following embodiments and the accompanying drawings are used to further describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0072] like Figure 1-8 As shown, the present invention provides a parallel gas density relay for monitoring the pressure of a gas to be measured, comprising:

[0073] Pneumatic structure 1, the pneumatic structure 1 includes at least one pneumatic module 11 and at least one pressure-bearing module 12; the pneumatic module 11 and the pressure-bearing module 12 are connected in parallel with each other, and each pneumatic module 11 is connected in parallel with each other, and each pressure-bearing module 12 is connected in parallel with each other; the pneumatic module 11 includes a measuring bellows 111 with an opening at the bottom and a compensating bellows 112 sealed at both ends; a sealed chamber is provided in the compensating bellows 112, and the sealed chamber is filled with a compensating gas with the same characteristics as the gas to be measured; a measuring chamber is provided in the measuring bellows 111 The bottom end of the measuring bellows 111 is connected to the gas to be measured so that the gas to be measured flows into the measuring chamber, and the measuring bellows 111 and the compensating bellows 112 are staggeredly connected; the pressure-bearing module 12 includes a first pressure-bearing bellows 121 sealed at both ends and a second pressure-bearing bellows 122 sealed at both ends, the first pressure-bearing bellows 121 and the second pressure-bearing bellows 122 are staggeredly connected, the first pressure-bearing bellows 121 is connected in parallel with the measuring bellows 111, and the second pressure-bearing bellows 122 is connected in parallel with the compensating bellows 112;

[0074] The drive structure 2 includes a connecting assembly 21 and a driving assembly 22 disposed on the connecting assembly 21. The measuring bellows 111 is staggeredly connected to the compensating bellows 112 via the connecting assembly 21; the first pressure-bearing bellows 121 is staggeredly connected to the second pressure-bearing bellows 122 via the connecting assembly 21.

[0075] The indicating structure 3 is connected to the driving assembly 22. When the pressure of the gas to be measured changes, each of the measuring bellows 111 and each of the first pressure-bearing bellows 121 is deformed, and the driving assembly 22 is driven to move through the connecting assembly 21, so as to push the indicating structure 3 to rotate and indicate the gas pressure value.

[0076] The parallel gas density relay of the present invention is used to monitor the pressure of the gas to be measured. The bottom end of the measuring bellows 111 is open and connected to the gas to be measured so that the gas to be measured flows into the measuring chamber. When the pressure of the gas to be measured changes, each measuring bellows 111 and the first pressure-bearing bellows 121 are deformed, driving the connecting component 21 to move up and down, and driving the indicating structure 3 to rotate through the driving component 22 to indicate the gas pressure value. When the pressure range of the monitored gas to be measured is large, the shells of each compensating bellows 112 and each second pressure-bearing bellows 122 share the pressure together, so that each compensating bellows 112 and each second pressure-bearing bellows 122 are deformed within the effective stroke, and when the compensating gas pressure is large, the shells of each measuring bellows 111 and each first pressure-bearing bellows 121 share the pressure together, so that each measuring bellows 111 and each first pressure-bearing bellows 121 are deformed within the effective stroke, thereby expanding the measurement range of the parallel gas density relay and meeting the gas pressure measurement needs in a wider range. In addition, each pneumatic module 11 and pressure-bearing module 12 still adopts a high-precision bellows structure to ensure that high-precision measurement can be maintained within a large range. In addition, when the external ambient temperature changes and causes the pressure of the gas to be measured to change, since the closed chamber is filled with a compensating gas with the same characteristics as the gas to be measured, the closed chamber and the measuring chamber are subjected to the same gas pressure, and the deformation of the compensating bellows 112 and the measuring bellows 111 are offset, avoiding the occurrence of indication errors due to changes in ambient temperature, ensuring that the measurement results are not affected by temperature, and allowing the parallel gas density relay to maintain stable measurement performance in an environment with large temperature fluctuations.

[0077] It is worth noting that due to the physical properties of the bellows, the air pressure that a single pair of bellows in the prior art can withstand is basically around 0.3Mpa. When the measuring bellows is filled with 0.3Mpa air pressure, the effective stroke of the compensating bellows basically reaches the maximum value; similarly, when the compensating bellows is filled with 0.3Mpa of compensating gas, the effective stroke of the measuring bellows also basically reaches the maximum value. Therefore, the gas pressure range that can be measured by the gas density relay in the prior art is relatively small, usually not exceeding 0.3MPa, and is mainly used in low-pressure measurement occasions, which limits its application in the high-pressure measurement field.

[0078] The parallel gas density relay of the present invention adopts a bellows parallel connection method. When the pressure range of the monitored gas is large, by sharing the pressure, each measuring bellows 111, each first pressure-bearing bellows 121, each compensation bellows 112, and each second pressure-bearing bellows 122 are deformed within the effective stroke, thereby expanding the measurement range of the parallel gas density relay and meeting the gas pressure measurement needs in a wider range.

[0079] In this embodiment, for example, Figure 2 As shown, the pneumatic structure 1 includes two pneumatic modules 11 connected in parallel, and two pressure-bearing modules 12 connected in parallel. The pneumatic modules 11 and the pressure-bearing modules 12 are connected in parallel, that is, two measuring bellows 111 connected in parallel, two compensating bellows 112 connected in parallel, two first pressure-bearing bellows 121 connected in parallel, and two second pressure-bearing bellows 122 connected in parallel. The measuring bellows 111 is connected in parallel with the first pressure-bearing bellows 121, and the compensating bellows 112 is connected in parallel with the second pressure-bearing bellows 122. The measuring bellows 111 is staggeredly connected to the compensating bellows 112 via a connecting assembly 21, and the first pressure-bearing bellows 121 is staggeredly connected to the second pressure-bearing bellows 122 via a connecting assembly 21. In order to better illustrate the working principle of the pneumatic structure 1, it is now explained in conjunction with the following specific applications:

[0080] Assuming that the compensation gas pressure is 0.4 MPa, the closed chambers of the two compensation bellows 112 are each filled with 0.4 MPa of compensation gas. Before the two measuring bellows 111 are connected to the gas to be measured, the compensation gas pressure × 2 = the pressure borne by the shell of the measuring bellows + the pressure borne by the shell of the first pressure-bearing bellows. Then the shell of each measuring bellows 111 and the shell of each first pressure-bearing bellows 121 each bear a pressure of 0.2 MPa.

[0081] (1) When the measuring chambers of the two measuring bellows 111 are filled with the gas to be measured at a pressure of 0.2 MPa, the compensation gas pressure × 2 = the pressure of the gas to be measured × 2 + the pressure borne by the shell of the measuring bellows + the pressure borne by the shell of the first pressure-bearing bellows. Then, the shell of each measuring bellows 111 and the shell of each first pressure-bearing bellows 121 bear a pressure of 0.1 MPa respectively. Each measuring bellows 111 and each first pressure-bearing bellows 121 deforms upward, driving the connecting assembly 21 to move upward, thereby driving the indicating structure 3 to rotate through the driving assembly 22 and indicating the gas pressure value.

[0082] (2) When the pressure of the gas to be measured drops, for example, when the pressure of the gas to be measured in the measuring chambers of the two measuring bellows 111 drops from 0.2 MPa to 0.1 MPa, the shell of each measuring bellows 111 and the shell of each first pressure-bearing bellows 121 each bear a pressure of 0.15 MPa, and each measuring bellows 111 and each first pressure-bearing bellows 121 deforms downward, driving the connecting assembly 21 to move downward, thereby driving the indicating structure 3 to rotate through the driving assembly 22 and indicating the gas pressure value.

[0083] (3) When the measuring chambers of the two measuring bellows 111 are filled with the gas to be measured at a pressure of 1 MPa, the compensation gas pressure × 2 + the pressure on the shell of the compensation bellows + the pressure on the shell of the second pressure-bearing bellows = the pressure of the gas to be measured × 2, the pressure on the shell of the compensation bellows + the pressure on the shell of the second pressure-bearing bellows = the pressure of the gas to be measured × 2 - compensation gas pressure × 2 = 2 MPa - 0.8 MPa = 1.2 MPa, then the shell of each compensation bellows 112 and the shell of each second pressure-bearing bellows 122 each bear a pressure of 0.3 MPa, each measuring bellows 111 and the first pressure-bearing bellows 121 deforms upward, driving the connecting assembly 21 to move upward, thereby driving the indicating structure 3 to rotate through the driving assembly 22 and indicating the gas pressure value.

[0084] (4) The closed chamber of the compensation bellows 112 is filled with a compensation gas with the same characteristics as the gas to be measured. When the gas pressure in the measuring chamber of the measuring bellows 111 is the same as the gas pressure in the closed chamber of the compensation bellows 112, the system is in equilibrium and the indicating structure 3 indicates the current gas pressure value. When the external ambient temperature changes, due to the same gas characteristics, the gas volume and pressure in the measuring chamber and the closed chamber will change in the same way, and the forces generated by the measuring bellows 111 and the compensation bellows 112 will also be the same. The force balance prevents the measuring bellows 111 and the compensation bellows 112 from relative displacement, and the drive assembly 22 will not move, so that the indicating structure 3 remains stationary and the indicated value remains unchanged. In this way, the compensation bellows 112 can automatically offset the influence of ambient temperature changes on the measurement results. Regardless of whether the temperature rises or falls, the compensation bellows 112 can ensure that the measurement results only reflect the actual changes in gas pressure without being affected by temperature, so that the parallel gas density relay can still maintain stable measurement performance in an environment with large temperature fluctuations.

[0085] Furthermore, each pneumatic module 11 is connected in parallel with each other, each pressure-bearing module 12 is connected in parallel with each other, the pneumatic module 11 and the pressure-bearing module 12 are connected in parallel with each other, and the measuring bellows 111 is staggeredly connected to the compensation bellows 112 through the connecting component 21, and the first pressure-bearing bellows 121 is staggeredly connected to the second pressure-bearing bellows 122 through the connecting component 21, so that multiple measuring bellows 111, multiple compensation bellows 112, multiple first pressure-bearing bellows 121, and multiple second pressure-bearing bellows 122 can be arranged compactly to make full use of the space. If the measuring range needs to be further expanded, it is only necessary to increase the number of bellows, which has high scalability.

[0086] In this embodiment, the bellows pressure calculation formula is as follows:

[0087] P=kx / S; Formula (1).

[0088] Among them, P represents the maximum pressure that the bellows can measure, S represents the effective area of ​​the bellows, k represents the single-wave axial stiffness of the bellows, and x represents the single-wave maximum axial displacement of the bellows.

[0089] It is worth noting that when a bellows is used for pressure measurement, its measurement range is determined by its own single-wave axial stiffness, single-wave maximum axial displacement and effective area. According to the numerical calculation in the commonly used specifications of sensitive bellows in JB / T 6169, the P value is less than 0.4Mpa. Therefore, the range of the bellows density meter on the current market is 0.2-0.3Mpa, which has a narrow measurement range. However, the present invention increases the k value by adopting the parallel connection of bellows, and the total stiffness k of the pneumatic structure 1 is increased. 总 =n×k, where n is the number of parallel bellows. As the total stiffness of the pneumatic structure 1 increases, the pneumatic structure 1 can withstand greater gas pressure. In a high-pressure environment, the stiffness and stability of the system are improved, and vibration under high pressure is reduced.

[0090] In this embodiment, the pneumatic structure 1 exemplarily includes two pneumatic modules 11 connected in parallel and two pressure-bearing modules 12 connected in parallel. The pneumatic modules 11 and pressure-bearing modules 12 are connected in parallel. Each pneumatic module 11 includes a measuring bellows 111 and a compensating bellows 112. Each pressure-bearing module 12 includes a first pressure-bearing bellows 121 sealed at both ends and a second pressure-bearing bellows 122 sealed at both ends. By connecting the bellows in parallel, the measurement range is increased. At this point, the overall stiffness of the pneumatic structure 1 is 4k. According to formula (1), the P value can reach 1.6 MPa, thus achieving the expected measurement range of over 1 MPa. This maintains the high-precision characteristics of the bellows while increasing the measurement range.

[0091] In this embodiment, the present invention can adapt to all working conditions from low pressure to ultra-high pressure by adjusting the number of pneumatic modules 11, and the measurement range can reach 0-5Mpa. At the same time, it also maintains the high precision advantage of the bellows itself, and retains the characteristics of gas compensation being better than bimetallic strips, ensuring the accuracy and reliability of the measurement, thereby obtaining better accuracy and stability than the original meter under a large range.

[0092] It should be noted that JB / T 6169 is a standard within the Chinese machinery industry standards, specifically titled "Technical Requirements for Gas Density Relays." This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation, and storage for gas density relays. It applies to relays used to monitor gas density in industries such as power, chemical, petroleum, and natural gas.

[0093] In this embodiment, if Figure 1 、 3As shown in Figures 4 and 8, the indicator structure 3 includes a freely rotatable movement assembly 31 and an indicator assembly 32 rotatably connected to the movement assembly 31. The movement assembly 31 is arranged above the drive assembly 22 and contacts the top of the drive assembly 22. The indicator assembly 32 includes a pointer 321 and a dial 322 arranged between the movement assembly 31 and the pointer 321. The pointer 321 is rotatably connected to the movement assembly 31.

[0094] In this embodiment, if Figure 1 As shown, the movement assembly 31 includes a movement support plate 311, a movement shaft 312 rotatably mounted on one side of the movement support plate 311, a gear structure 313 mounted on the other side of the movement support plate 311, and a pointer shaft connected to the gear structure 313. The movement shaft 312 is provided with a movement pin 3121 and a movement push rod 3122. The gear structure 313 is provided with a hairspring. The movement support plate 311 is provided with a second through-hole, through which the movement push rod 3122 passes to contact the gear structure 313. The movement pin 3121 contacts the top of the drive assembly 22. The pointer 321 is connected to the pointer shaft. The hairspring provides a preload force, ensuring that the movement pin 3121 and the movement push rod 3122 are in constant contact with the top of the drive assembly 22 and the gear structure 313 as the drive assembly 22 moves up and down. When the pressure of the gas to be measured changes, the measuring bellows 111 and the first pressure-bearing bellows 121 are deformed, and the driving assembly 22 is driven to move up and down through the connecting assembly 21. Since the movement pin 3121 and the movement push rod 3122 are acted upon by the elastic force of the hairspring, the movement pin 3121 is always in contact with the top of the driving assembly 22, and the movement push rod 3122 is always in contact with the gear structure 313. When the driving assembly 22 moves up and down, the driving assembly 22 pushes the movement pin 3121 to drive the movement shaft 312 to rotate, and drives the gear structure 313 to rotate through the movement push rod 3122, so as to drive the pointer 321 to rotate around the connection point with the pointer shaft through the pointer shaft. After the pointer 321 rotates, it is aligned with the scale marked on the dial 322, which is the gas pressure value of the gas to be measured.

[0095] In this embodiment, if Figure 4 、 6As shown, the system further includes a pressure signal acquisition module 4, which is disposed within one of the measurement chambers to acquire the pressure signal of the gas to be measured. Since one open end of each measurement bellows 111 is connected to the gas to be measured, the gas to be measured can flow freely within each measurement chamber. Therefore, the pressure within the measurement chamber of each measurement bellows 111 is the same. Therefore, by only disposing the pressure signal acquisition module 4 within one measurement chamber, the pressure signal of the gas to be measured can be acquired, reducing the number of pressure signal acquisition modules 4 used and simplifying system design and cost.

[0096] In this embodiment, if Figure 1-7 As shown, the open end of each measuring bellows 111 is connected to an external air chamber filled with the gas to be measured. According to the principle of pressure transmission, pressure is uniformly transmitted within a fluid (gas or liquid). If the pressure within the external air chamber is 1 MPa, this pressure will be uniformly applied to all parts of the external air chamber, including each measuring bellows 111 connected thereto. Therefore, the gas pressure within each measuring chamber will be 1 MPa. Each measuring bellows 111 is connected in parallel to the same external air chamber and will experience the same gas pressure simultaneously. The pressure is not distributed due to the presence of multiple measuring bellows 111 (i.e., it will not be 0.5 MPa per bellows). Instead, each measuring bellows 111 will independently experience a gas pressure of 1 MPa. Gas pressure is an intensive quantity (independent of area), not an extensive quantity (such as force). Therefore, the gas pressure is not distributed due to the connection of multiple measuring bellows; each measuring bellows will experience the same 1 MPa pressure.

[0097] In this embodiment, the pressure signal acquisition module 4 includes a piezoresistor or pressure sensor. A piezoresistor is a component whose resistance changes with pressure and can convert pressure signals into changes in resistance. The piezoresistor is installed in the measurement chamber. When the gas to be measured flows into the measurement chamber, the gas pressure acts on the piezoresistor, causing the resistance of the piezoresistor to change with the gas pressure. By measuring this change in resistance, the pressure of the gas to be measured can be indirectly calculated.

[0098] In this embodiment, the pressure sensor is a device that directly converts pressure signals into electrical signals, offering high precision and fast response. When the gas to be measured flows into the measurement chamber, the gas pressure acts on the pressure sensor, which then outputs an electrical signal proportional to the pressure, facilitating subsequent signal processing and data acquisition.

[0099] In this embodiment, if Figure 1 、 3As shown in Figures 4 and 8, the device further includes a circuit board 5, which is electrically connected to the pressure signal acquisition module 4 to transmit the pressure signal collected by the pressure signal acquisition module 4 to the outside. The circuit board 5 is electrically connected to the pressure signal acquisition module 4 via a signal transmission line 9. The circuit board 5 calculates the resistance value measured by the piezoresistor to obtain the pressure of the gas to be measured and transmits it to the outside. The circuit board 5 processes the electrical signal output by the pressure sensor to obtain the pressure of the gas to be measured and transmits it to the outside.

[0100] In this embodiment, if Figure 4 As shown, the circuit board 5 is electrically connected to a backend computer 8 via a signal transmission line 9, or alternatively, the circuit board 5 is communicatively connected to the backend computer 8 to transmit the pressure of the gas to be measured to the backend computer 8, thereby enabling remote transmission of the pressure signal. The backend computer 8 can analyze changes in gas pressure to determine whether there are system faults (such as gas leaks or abnormal pressure), allowing operators to remotely monitor gas pressure changes without having to be physically present on-site. Therefore, the parallel gas density relay of the present invention has remote transmission capabilities.

[0101] In this embodiment, if Figure 1-7 As shown, the measuring bellows 111 and the compensating bellows 112 of each pneumatic module 11 are provided with an initial compression amount (pre-compression), which means that when not subjected to external force, both are in a partially contracted state, but have not reached the maximum contraction limit. The initial compression amount makes the measuring bellows 111 and the compensating bellows 112 in a pre-tightened state when not subjected to external force. When the pressure of the gas to be measured changes, even if the range of change is small, the measuring bellows 111 and the compensating bellows 112 can respond, which broadens the application range of the parallel gas density relay and enables it to play a stable measurement role under more diverse working conditions.

[0102] It's worth noting that both measuring bellows 111 and compensating bellows 112 are configured with an initial compression. This allows them to respond to small changes in external pressure (especially negative pressure), as negative pressure typically varies slightly and within a narrow range (e.g., -0.1 MPa to 0 MPa). This initial compression ensures that both bellows 111 and compensating bellows 112 maintain a linear response within their operating range, reducing nonlinear errors and improving system stability and resistance to seismic and shock events.

[0103] In this embodiment, if Figure 1-7As shown, the measuring bellows 111 can sense the pressure changes of the gas to be measured, while the compensating bellows 112 can offset the influence of the ambient temperature, and the initial compression between the two can be achieved by mechanical preload. When the system is in a negative pressure state, the external pressure is higher than the internal pressure, and the measuring bellows 111 will shrink axially. Due to the existence of the initial compression, the measuring bellows 111 is already in a pre-shrinkage state, so the measuring bellows 111 can be displaced immediately without overcoming its own elastic resistance, eliminating the measurement lag and ensuring that the system can respond to negative pressure changes. The compensating bellows 112 is axially elongated by the contraction of the measuring bellows 111, and drives the driving assembly 22 to move through the connecting assembly 21, so as to drive the movement assembly 31 to rotate and drive the indicating assembly 32 to indicate the gas pressure value in real time.

[0104] In this embodiment, if Figure 1-7 As shown, the connecting assembly 21 includes a first connecting plate 211 and a second connecting plate 212 arranged in parallel, and a support tube 213 for connecting the first connecting plate 211 and the second connecting plate 212. The bottom end of the compensating bellows 112 is connected to the first connecting plate 211, the top end of the measuring bellows 111 is connected to the second connecting plate 212, the top end of the first pressure-bearing bellows 121 is connected to the second connecting plate 212, and the bottom end of the second pressure-bearing bellows 122 is connected to the first connecting plate 211. The setting position of the first connecting plate 211 is higher than the bottom ends of the measuring bellows 111 and the first pressure-bearing bellows 121, and the setting position of the second connecting plate 212 is lower than the top ends of the compensating bellows 112 and the second pressure-bearing bellows 122, thereby realizing the misalignment of the measuring bellows 111 and the compensating bellows 112 in the height direction, and the misalignment of the first pressure-bearing bellows 121 and the second pressure-bearing bellows 122 in the height direction.

[0105] In this embodiment, if Figure 1-7 As shown, when the pressure of the gas to be measured rises, each measuring bellows 111 and each first pressure-bearing bellows 121 deform upward, driving the connecting assembly 21 to move upward as a whole, thereby driving the driving assembly 22 to move upward. The driving assembly 22 pushes the movement pin 3121 to rotate the movement shaft 312, and drives the gear structure 313 to rotate through the movement push rod 3122, thereby driving the pointer 321 to rotate through the pointer shaft and indicate the gas pressure value. When the pressure of the gas to be measured drops, each measuring bellows 111 and each first pressure-bearing bellows 121 deform downward, driving the connecting assembly 21 to move downward as a whole, thereby driving the driving assembly 22 to move downward. The driving assembly 22 pushes the movement pin 3121 to rotate the movement shaft 312, and drives the gear structure 313 to rotate through the movement push rod 3122, thereby driving the pointer 321 to rotate through the pointer shaft and indicate the gas pressure value.

[0106] In this embodiment, if Figure 1 、 3 , 4, 6-8, further comprising a housing structure 6, the housing structure 6 comprising a housing 61, an upper cover 62 arranged on the top of the housing 61, and a lower cover 63 arranged at the bottom of the housing 61, the pneumatic structure 1 and the connecting assembly 21 are both arranged in an accommodating cavity formed by the housing 61, the upper cover 62, and the lower cover 63; a gas nozzle 631 for communicating with the gas to be measured is provided at the bottom of the lower cover 63; the measuring bellows 111 in each of the pneumatic modules 11 has an open bottom end They are respectively connected to the air nozzle 631, and the bottom end of the first pressure-bearing bellows 121 in each of the pressure-bearing modules 12 is respectively connected to the lower cover 63; the top end of the compensation bellows 112 in each of the pneumatic modules 11 is respectively fixedly connected to the upper cover 62, and the top end of the second pressure-bearing bellows 122 in each of the pressure-bearing modules 12 is respectively fixedly connected to the upper cover 62, so as to connect each of the pneumatic modules 11 in parallel, the pressure-bearing modules 12 and the pneumatic modules 11 in parallel, and each of the pressure-bearing modules 12 in parallel.

[0107] In this embodiment, an annular gas channel is provided at the bottom of the lower cover 63, and the annular gas channel extends all the way to the gas nozzle 631. The bottom ends of the measuring bellows 111 in each of the pneumatic modules 11 are respectively connected to the annular gas channel, so that the bottom ends of the measuring bellows 111 with openings are respectively connected to the gas nozzle 631.

[0108] In this embodiment, if Figure 1-7As shown, the bottom end of the measuring bellows 111 in each pneumatic module 11 is connected to the air nozzle 631, and the top end is connected to the second connecting plate 212; the bottom end of the first pressure-bearing bellows 121 in each pressure-bearing module 12 is connected to the lower cover 63, and the top end is connected to the second connecting plate 212; the bottom end of the compensating bellows 112 in each pneumatic module 11 is connected to the first connecting plate 211, and the top end is fixedly connected to the upper cover 62; the bottom end of the second pressure-bearing bellows 122 in each pressure-bearing module 12 is connected to the first connecting plate 211, and the top end is fixedly connected to the upper cover 62, thereby realizing the mutual parallel connection of each pneumatic module 11 and the mutual parallel connection of the pressure-bearing module 12 and the pneumatic module 11. By connecting the pneumatic modules 11 in parallel, the pressure-bearing modules 12 in parallel with each other, and thus connecting the pressure-bearing modules 12 and the pneumatic modules 11 in parallel, and connecting the pressure-bearing modules 12 in parallel with each other, when the pressure range of the monitored gas to be measured is large, the shells of the compensation bellows 112 and the second pressure-bearing bellows 122 share the pressure together, so that the compensation bellows 112 and the second pressure-bearing bellows 122 are deformed within the effective stroke, and when the compensating gas pressure is large, the shells of the measuring bellows 111 and the first pressure-bearing bellows 121 share the pressure together, thereby expanding the measuring range of the parallel gas density relay, so that the relay can adapt to various measurement needs.

[0109] In this embodiment, a compensating gas filling port is provided on the upper cover 62 to fill the closed chamber of each compensating bellows 112 with compensating gas.

[0110] In this embodiment, if Figure 1 、 3 -4, 6-8, the driving assembly 22 includes a linear driving rod 221 and a sliding block 222. One end of the linear driving rod 221 is connected to the connecting assembly 21, and the other end is connected to the sliding block 222. The movement assembly 31 is arranged above the sliding block 222 and contacts the top of the sliding block 222. The movement pin 3121 is always in contact with the top of the sliding block 222. When the pressure of the gas to be measured changes, the measuring bellows 111 and the first pressure-bearing bellows 121 are deformed, and the linear driving rod 221 is driven to move up and down by the connecting assembly 21, and the sliding block 222 is driven to push the movement pin 3121 to drive the movement shaft 312 to rotate, and the gear structure 313 is driven to rotate by the movement push rod 3122, thereby driving the pointer 321 to rotate through the pointer shaft and indicating the gas pressure value.

[0111] In this embodiment, if Figure 1 、 3-4, 6-8, a first through hole is provided on the upper cover 62, one end of the linear drive rod 221 passes through the first through hole and is connected to the connecting assembly 21, and is capable of moving up and down in the first through hole, and the other end is connected to the sliding block 222. The sliding block 222, the circuit board 5, the movement assembly 31, and the indicating assembly 32 are all located above the shell structure 6. When the pressure of the gas to be measured changes, the measuring bellows 111 and the first pressure-bearing bellows 121 are deformed, the second connecting plate 212 drives the first connecting plate 211 to move up and down, and drives the sliding block 222 to move up and down through the linear drive rod 221, so that the sliding block 222 drives the movement pin 3121 to drive the movement shaft 312 to rotate, and drives the gear structure 313 to rotate through the movement push rod 3122, thereby driving the pointer 321 to rotate through the pointer shaft and indicating the gas pressure value.

[0112] In this embodiment, if Figure 1 、 3 As shown in Figures 4 and 8, the device further includes an alarm structure 7, which is disposed below the sliding block 222 and in the movement path of the sliding block 222. When the pressure of the gas to be measured changes, the measuring bellows 111 and the first pressure-bearing bellows 121 are deformed, and the sliding block 222 is driven by the connecting assembly 21 to move away from or toward the alarm structure 7.

[0113] In this embodiment, if Figure 1 、 3 -4 and 8, the alarm structure 7 includes a plurality of micro switches, each of which is respectively arranged on the circuit board 5. The circuit board 5 is arranged below the sliding block 222 and is located on the moving path of the sliding block 222. The circuit board 5 is arranged on the top of the upper cover 62. When the pressure of the gas to be measured rises, each measuring bellows 111 and each first pressure-bearing bellows 121 are deformed upward, and the second connecting plate 212 drives the first connecting plate 211 to move upward as a whole, and drives the sliding block 222 to move upward through the linear drive rod 221, and the sliding block 222 moves away from the micro switch, and the sliding block 222 drives the movement assembly 31 to rotate, so as to drive the indicating assembly 32 to rotate and indicate the gas pressure value. When the gas to be measured leaks, that is, the pressure of the gas to be measured drops, each measuring bellows 111 and each first pressure-bearing bellows 121 deforms downward, and the second connecting plate 212 drives the first connecting plate 211 to move downward as a whole, and drives the sliding block 222 to move downward through the linear drive rod 221. The sliding block 222 approaches the micro switch and triggers the micro switch action, and the sliding block 222 drives the movement assembly 31 to rotate, so as to drive the indicating assembly 32 to rotate and indicate the gas pressure value.

[0114] In this embodiment, the driving structure 2 further includes a trigger component for triggering the alarm structure 7. The trigger component is disposed on the driving component 22. The driving component 22 can drive the trigger component to move, thereby triggering the alarm structure 7 to operate.

[0115] In this embodiment, if Figure 3 、 8 As shown, the sliding block 222 is provided with adjustment holes 2221, the same number as the micro switches, and the trigger component is a trigger screw arranged in the adjustment hole 2221. The trigger screw passes through the bottom of the adjustment hole 2221 and is used to trigger the micro switch. By adjusting the position of the trigger screw in the adjustment hole 2221, the distance of the trigger screw relative to the micro switch is adjusted to achieve alarm triggering at different pressure thresholds, thereby realizing the function of multi-level alarm.

[0116] In this embodiment, by way of example, there are four microswitches, namely, a first microswitch, a second microswitch, a third microswitch, and a fourth microswitch. The slider 222 is provided with four adjustment holes 2221, each of which houses a trigger screw, namely, a first trigger screw, a second trigger screw, a third trigger screw, and a fourth trigger screw. Each trigger screw is positioned at a different distance from the microswitch. When the pressure of the gas to be measured drops to a first preset pressure threshold, the first trigger screw moves to a position contacting the first microswitch, triggering the first microswitch and causing it to operate. A switching signal from the first microswitch is transmitted via the circuit board 5 to an external device. When the pressure of the gas to be measured drops to a second preset pressure threshold, the second trigger screw moves to a position contacting the second microswitch, triggering the second microswitch and causing it to operate. A switching signal from the second microswitch is transmitted via the circuit board 5 to an external device. When the pressure of the gas to be measured drops to a third preset pressure threshold, the third trigger screw moves to a position contacting the third microswitch, triggering the third microswitch and causing it to operate. A switching signal from the third microswitch is transmitted via the circuit board 5 to an external device. When the pressure of the gas to be measured drops to the fourth preset pressure threshold, the fourth trigger screw moves to a position in contact with the fourth microswitch, triggering the fourth microswitch to operate. The switch signal emitted by the fourth microswitch is transmitted to the external device through the circuit board 5, thereby achieving the effect of segmented triggering of the parallel gas density relay. It can be used in a variety of occasions or on a variety of electrical equipment and has strong applicability.

[0117] In this embodiment, a meter cover is also included, which is arranged on the upper cover 62. The circuit board 5, the alarm structure 7, the sliding block 222, the movement assembly 31, and the indicator assembly 32 are all arranged in the meter cover to prevent dust, moisture and other pollutants from entering the meter cover, thereby ensuring that the parallel gas density relay can work normally in a clean and dry environment.

[0118] In summary, the parallel gas density relay of the present invention has the following advantages:

[0119] (1) Expanding the measurement range: When the pressure range of the monitored gas to be measured is large, the shells of each compensating bellows 112 and each second pressure-bearing bellows 122 share the pressure together, so that each compensating bellows 112 and each second pressure-bearing bellows 122 are deformed within the effective stroke. Moreover, when the compensating gas pressure is large, the shells of each measuring bellows 111 and each first pressure-bearing bellows 121 share the pressure together, so that each measuring bellows 111 and each first pressure-bearing bellows 121 are deformed within the effective stroke. This can expand the measurement range of the parallel gas density relay and meet the needs of gas pressure measurement in a wider range.

[0120] (2) High-precision measurement: Each pneumatic module 11 still adopts a high-precision bellows structure to ensure high-precision measurement within a large range.

[0121] (3) Temperature compensation: The compensation bellows 112 is filled with a compensation gas with the same characteristics as the gas to be measured, which can automatically offset the impact of ambient temperature changes on the measurement results. When the temperature changes, the deformation of the compensation bellows 112 and the measurement bellows 111 offset each other, ensuring that the measurement results are not affected by temperature interference. Therefore, in an environment with large temperature fluctuations, the parallel gas density relay can still maintain stable measurement performance.

[0122] (4) Realizing a multi-level alarm function: The trigger screw passes through the bottom of the adjusting through hole 2221 and is used to trigger the micro switch. By adjusting the position of the trigger screw in the adjusting through hole 2221, the distance between the trigger screw and the micro switch can be adjusted to realize alarm triggering at different pressure thresholds, thereby realizing a multi-level alarm function to meet the needs of different application scenarios.

[0123] (5) Remote transmission of pressure signals: The circuit board 5 is electrically connected to the back-end computer 8 via the signal transmission line 9 to transmit the pressure signal of the gas to be tested to the back-end computer 8. The back-end computer 8 can determine whether there is a fault in the system (such as gas leakage, pressure abnormality, etc.) by analyzing the changes in the pressure signal. The operator can remotely monitor the changes in the gas pressure.

[0124] (6) Simple structure: The pneumatic modules 11 are connected in parallel with each other, the pressure-bearing modules 12 are connected in parallel with each other, the pneumatic modules and the pressure-bearing modules 12 are connected in parallel with each other, and the measuring bellows 111 and the compensating bellows 112 in each pneumatic module 11 are staggered and connected, and the first pressure-bearing bellows 121 and the second pressure-bearing bellows 122 in each pressure-bearing module 12 are staggered and connected, making full use of space, compact arrangement, simple structure and process, and very suitable for mass production.

[0125] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0126] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A parallel gas density relay for monitoring the pressure of a gas to be measured, characterized in that: include: A pneumatic structure (1), the pneumatic structure (1) comprising at least one pneumatic module (11) and at least one pressure-bearing module (12); the pneumatic module (11) and the pressure-bearing module (12) are connected in parallel with each other, the pneumatic modules (11) are connected in parallel with each other, and the pressure-bearing modules (12) are connected in parallel with each other; the pneumatic module (11) comprises a measuring bellows (111) with an opening at the bottom end and a compensating bellows (112) with sealed ends; a sealed chamber is provided in the compensating bellows (112), and the sealed chamber is filled with a compensating gas having the same characteristics as the gas to be measured; a measuring chamber is provided in the measuring bellows (111) The bottom end of the measuring bellows (111) is in communication with the gas to be measured so that the gas to be measured flows into the measuring chamber, and the measuring bellows (111) and the compensating bellows (112) are connected in a staggered manner; the pressure-bearing module (12) comprises a first pressure-bearing bellows (121) sealed at both ends and a second pressure-bearing bellows (122) sealed at both ends, the first pressure-bearing bellows (121) and the second pressure-bearing bellows (122) are connected in a staggered manner, the first pressure-bearing bellows (121) and the measuring bellows (111) are connected in parallel, and the second pressure-bearing bellows (122) and the compensating bellows (112) are connected in parallel; A drive structure (2), the drive structure (2) comprising a connecting assembly (21) and a drive assembly (22) arranged on the connecting assembly (21), the measuring bellows (111) being staggeredly connected to the compensating bellows (112) via the connecting assembly (21); and the first pressure-bearing bellows (121) being staggeredly connected to the second pressure-bearing bellows (122) via the connecting assembly (21); An indicating structure (3) is connected to the driving assembly (22). When the pressure of the gas to be measured changes, each of the measuring bellows (111) and each of the first pressure-bearing bellows (121) deforms, and drives the driving assembly (22) to move via the connecting assembly (21), thereby pushing the indicating structure (3) to rotate and indicate the gas pressure value.

2. The parallel gas density relay according to claim 1, characterized in that: The indicating structure (3) comprises a freely rotatable movement assembly (31) and an indicating assembly (32) rotatably connected to the movement assembly (31); the movement assembly (31) is arranged above the drive assembly (22) and contacts the top of the drive assembly (22); the indicating assembly (32) comprises a pointer (321) and a dial (322) arranged between the movement assembly (31) and the pointer (321); the pointer (321) is rotatably connected to the movement assembly (31).

3. The parallel gas density relay according to claim 1, characterized in that: It also includes a pressure signal acquisition module (4), which is arranged in one of the measurement chambers to acquire the pressure signal of the gas to be measured.

4. The parallel gas density relay according to claim 3, characterized in that: It also includes a circuit board (5), wherein the circuit board (5) is electrically connected to the pressure signal acquisition module (4) so ​​as to transmit the pressure signal acquired by the pressure signal acquisition module (4) to the outside.

5. The parallel gas density relay according to claim 1, characterized in that: The connecting assembly (21) includes a first connecting plate (211), a second connecting plate (212) and a supporting tube (213) for connecting the first connecting plate (211) and the second connecting plate (212), the bottom end of the compensating bellows (112) is connected to the first connecting plate (211), the top end of the measuring bellows (111) is connected to the second connecting plate (212), the top end of the first pressure-bearing bellows (121) is connected to the second connecting plate (212), and the bottom end of the second pressure-bearing bellows (122) is connected to the measuring bellows (111). The first connecting plate (211) is connected, and the setting position of the first connecting plate (211) is higher than the bottom ends of the measuring bellows (111) and the first pressure-bearing bellows (121), and the setting position of the second connecting plate (212) is lower than the top ends of the compensating bellows (112) and the second pressure-bearing bellows (122), thereby achieving the misalignment of the measuring bellows (111) and the compensating bellows (112) in the height direction, and the misalignment of the first pressure-bearing bellows (121) and the second pressure-bearing bellows (122) in the height direction.

6. The parallel gas density relay according to claim 2, characterized in that: The invention also includes a shell structure (6), wherein the shell structure (6) includes a shell (61), an upper cover (62) arranged on the top of the shell (61), and a lower cover (63) arranged at the bottom of the shell (61); the pneumatic structure (1) and the connecting assembly (21) are both arranged in an accommodating cavity formed by the shell (61), the upper cover (62), and the lower cover (63); the bottom of the lower cover (63) is provided with a gas nozzle (631) for communicating with the gas to be measured; the measuring bellows (111) in each of the pneumatic modules (11) have an open bottom end, respectively. The bottom ends of the first pressure-bearing bellows (121) in each of the pressure-bearing modules (12) are connected to the lower cover (63), and the top ends of the compensating bellows (112) in each of the pneumatic modules (11) are fixedly connected to the upper cover (62), and the top ends of the second pressure-bearing bellows (122) in each of the pressure-bearing modules (12) are fixedly connected to the upper cover (62), so as to connect the pneumatic modules (11) in parallel, the pressure-bearing modules (12) and the pneumatic modules (11) in parallel, and the pressure-bearing modules (12) in parallel.

7. The parallel gas density relay according to claim 6, characterized in that: The driving assembly (22) includes a linear driving rod (221) and a sliding block (222), one end of the linear driving rod (221) is connected to the connecting assembly (21), and the other end is connected to the sliding block (222); the movement assembly (31) is arranged above the sliding block (222) and contacts the top of the sliding block (222).

8. The parallel gas density relay according to claim 7, characterized in that: A first through hole is provided on the upper cover (62), one end of the linear drive rod (221) passes through the first through hole and is connected to the connecting assembly (21), and is capable of moving up and down in the first through hole, and the other end is connected to the sliding block (222).

9. The parallel gas density relay according to claim 7, characterized in that: It also includes an alarm structure (7), which is arranged below the sliding block (222) and located on the moving path of the sliding block (222); when the pressure of the gas to be measured changes, the measuring bellows (111) and the first pressure-bearing bellows (121) are deformed, and the sliding block (222) is driven to move in a direction away from or close to the alarm structure (7) through the connecting component (21).

10. The parallel gas density relay according to claim 9, characterized in that: The driving structure (2) further comprises a trigger component for triggering the alarm structure (7), wherein the trigger component is arranged on the driving component (22), and the driving component (22) can drive the trigger component to move, thereby triggering the alarm structure (7) to operate.

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