A bellows gas density measuring device

Abstract

The application provides a bellows gas density measuring device, which comprises a cylinder and a watchcase detachably connected with the cylinder; one end of the cylinder is provided with a joint for connecting a gas pipeline to be measured; a bellows assembly is coaxially arranged in the cylinder; the bellows assembly comprises a first bellows, one end of the first bellows is connected with the joint, and the other end of the first bellows is sealingly connected with a bottom cover; a second bellows, an end of the second bellows is sealingly connected with the bottom cover; a third bellows, the third bellows is coaxially sleeved in the second bellows, and a closed cavity is formed among the bottom cover, the second bellows and the third bellows; a transmission assembly is tightly matched with the bellows assembly, so that the slight displacement of the bellows is accurately transmitted to a movement and a pointer, the measurement error is significantly reduced, high-precision gas density measurement is realized, and the accuracy of the measurement result is ensured.

Description

Technical Field

[0001] This invention relates to the technical field of sulfur hexafluoride density relays, and in particular to a bellows gas density measuring device. Background Technology

[0002] The bellows-type density relay is a key instrument used to monitor the density of sulfur hexafluoride gas. It is widely used in high-voltage electrical equipment (such as GIS, circuit breakers, instrument transformers, etc.). By sensing changes in the density of sulfur hexafluoride gas, it can determine whether there are problems such as gas leakage or abnormal pressure inside the equipment, thereby ensuring the safe operation of the equipment.

[0003] Existing bellows gas density measuring devices have the following technical problems: 1. Complex structure (the manual states that existing devices are complex, but this one is simpler, including the measuring range, compared to existing ones): Existing bellows gas density measuring devices have a complex structure, are difficult to manufacture, and are challenging to produce. 2. Inability to display the full range: Due to structural design limitations, some existing density relays cannot display the gas density value across the entire range, resulting in a limited range of gas density display and inaccurate measurement results. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a bellows gas density measuring device, which solves the problems of the existing gas density measuring devices having a relatively complex structure and being unable to display the full range.

[0005] To achieve the above objectives, the present invention provides a bellows gas density measuring device, comprising:

[0006] A cylinder, and a watch case detachably connected to the cylinder;

[0007] One end of the cylinder is provided with a connector for connecting to the gas pipeline to be tested, and a corrugated assembly is coaxially arranged inside the cylinder.

[0008] The corrugated assembly includes: a first corrugated pipe, one end of which is connected to the connector, and the other end of which is sealed to the bottom cover; a second corrugated pipe, the end of which is sealed to the bottom cover; and a third corrugated pipe, which is coaxially sleeved inside the second corrugated pipe, and a closed cavity is formed between the bottom cover, the second corrugated pipe, and the third corrugated pipe.

[0009] The watch case contains a transmission component;

[0010] The transmission assembly includes a transmission rod, the first shaft end of the transmission rod is connected to the bottom cover, a transmission block is sleeved on the transmission rod near the second shaft end, and adjusting members are provided on opposite sides of the transmission block, with the ends of the adjusting members connected to a signal transmission assembly.

[0011] The inner wall of the watch case where it connects with the cylinder is provided with a through hole, which simultaneously penetrates the inner wall of the watch case and the inner wall of the cylinder to form a through channel; the transmission rod passes through the through hole and can reciprocate linearly in the horizontal direction within the space defined by the through hole;

[0012] The second shaft end of the transmission rod is connected to a mechanism, and the end of the mechanism is connected to a pointer. A dial is provided between the mechanism and the pointer, and the dial is used to display the gas density value.

[0013] As a more preferred method, when the temperature is constant, gas enters the first bellows through the connector, causing displacement of the first bellows and thus displacement of the bottom cover connected to the first bellows. Simultaneously, the bottom cover pushes the transmission rod to move. The movement of the transmission rod triggers a microswitch in the signal transmission assembly via the transmission block and adjusting component, outputting a corresponding switching signal. The displacement of the transmission rod drives the movement to rotate, thereby driving the pointer to indicate the current gas density value on the dial. The mechanical design of the transmission assembly results in low wear on the mechanical structure between the bellows and the transmission assembly, helping to reduce maintenance frequency and extend the service life of the device. Designing the microswitch and adjusting component as mechanical contacts ensures high sensitivity, allowing for independent replacement of the adjusting component and microswitch without overall disassembly, facilitating device maintenance.

[0014] As a more preferred approach, when the temperature rises, the increased internal pressure of the first bellows causes it to compress and expand, pushing the bottom cover towards the second and third bellows. The pressure of the compensating gas inside the second and third bellows also increases accordingly, pushing the bottom cover towards the first bellows. One end of the bottom cover is pushed by the first bellows, and the other end by the second and third bellows, with both forces increasing synchronously. This keeps the bottom cover relatively stationary, ensuring the stability of the indicator and signal output sections of the mechanism. When the first bellows (in direct contact with the gas being measured) expands due to the increased temperature, the second and third bellows (compensation units within the closed cavity) also expand due to the synchronous heating of their internal gases. The opposing directions and matching amplitudes of the thrust at both ends keep the bottom cover in a stable position. Gas density depends only on the ratio of pressure to temperature (ideal gas law ρ = PM / RT), and this design directly counteracts the effect of temperature on pressure through physical structure, without relying on electronic temperature sensors or software compensation algorithms. Compared to traditional single-bellows systems that produce erroneous outputs when temperatures fluctuate, this design eliminates mechanical displacement caused by temperature, resulting in more accurate and reliable measurement results. Furthermore, during temperature fluctuations, the elastic deformation of the bellows allows for thrust rebalancing in a very short time, enabling rapid response to transient temperature changes and avoiding the delay errors caused by thermal inertia in traditional systems.

[0015] As a preferred approach, when the temperature decreases, the internal gas pressure of the first bellows decreases, causing it to contract and pull the bottom cover towards the first bellows. Simultaneously, the compensating gas pressure inside the second and third bellows decreases accordingly, pulling the bottom cover towards the second and third bellows. One end of the bottom cover is pulled by the first bellows, and the other end by the second and third bellows, with the pulling forces at both ends increasing synchronously. This keeps the bottom cover relatively stationary, ensuring the stability of the movement's indicator and signal output. The multi-bellows combination design allows the first bellows to directly sense changes in the gas pressure, while the second and third bellows form a closed cavity for compensation. This effectively reduces interference from environmental factors (such as temperature and vibration) on the measurement results, making gas density measurements more accurate. This multi-level compensation mechanism significantly reduces measurement errors, improves measurement accuracy, and more precisely reflects the actual changes in gas density. The tension generated by the first bellows due to the decrease in air pressure, and the opposing tension generated by the second and third bellows to compensate for the decrease in air pressure, achieve a state of force equilibrium through bidirectional synchronous tension. This ensures the stability of density measurement from low to high temperatures and eliminates the influence of temperature changes on the measurement results. When the temperature decreases, the synchronous reverse compensation of the multiple bellows keeps the bottom cover in an absolutely static position, and the measured value does not change with temperature.

[0016] As a preferred embodiment, the signal transmission component includes microswitches, a terminal block, and terminals; multiple microswitches are symmetrically mounted on the terminal block, and the microswitches are electrically connected to the terminals. Symmetrically mounting multiple microswitches on the terminal block can counteract the lateral forces or vibrations transmitted when the bellows and transmission rod are displaced, preventing switch contact offset or deformation caused by unilateral force, maintaining stable contact pressure, reducing false triggering caused by mechanical vibration, and extending the service life of the microswitches. Furthermore, the centralized wiring design reduces wire harness crossing and the impact of electromagnetic interference; the symmetrical structure of the microswitches on the terminal block facilitates uniform heat distribution and avoids poor contact problems caused by localized overheating.

[0017] As a more preferred approach, multiple microswitches are provided, each abutting against the end of the adjusting component. Multiple microswitches, linked by the adjusting component, enable multi-point synchronous detection of bellows displacement, reducing detection blind spots caused by mechanical backlash or springback in individual switches, eliminating errors due to mechanical hysteresis, and making gas density measurements more accurate. Furthermore, by having the end of the adjusting component abut against each microswitch, the force on the adjusting component is shared by multiple microswitches, preventing contact deformation or mechanical fatigue caused by concentrated stress and extending the component's service life. Moreover, symmetrically arranging the multiple microswitches can counteract vibrations transmitted to the adjusting component by the transmission rod, reducing the probability of false triggering between the adjusting component and the microswitches, and ensuring accurate and safe response.

[0018] As a preferred approach, the central axis of the transmission rod coincides with the central axis of the transmission block. This coaxial layout ensures that the axial displacement of the transmission rod is converted into linear motion of the transmission block, eliminating frictional losses and motion lag caused by lateral forces in traditional eccentric layouts. The thrust from the corrugated assembly driving the transmission rod is transmitted along the same axis, resulting in uniform pressure distribution on the contact surface of the transmission block and preventing localized stress concentrations. The coaxial design of the transmission rod and transmission block avoids trajectory deviations caused by assembly errors or thermal deformation, reducing measurement errors in gas density. Furthermore, since no additional guiding mechanisms (such as guide rails or bearing assemblies) are required to constrain lateral displacement, this device features a simple and rational structural design compared to traditional complex designs, saving manufacturing materials and reducing material and manufacturing costs.

[0019] As a more preferred embodiment, guide grooves are provided on both sides of the transmission block, and the adjusting member is slidably mounted within the guide grooves to adjust the sliding stroke. The guide grooves provide bidirectional constraints for the adjusting member, ensuring that it slides only in a preset direction, eliminating lateral forces caused by the tilting of the adjusting member in traditional designs. Furthermore, the guide groove structure converts the lateral force on the adjusting member into positive pressure on the groove wall, forming a self-locking guide and preventing displacement drift caused by vibration or impact. The adjusting member can slide freely and lock within the guide groove, supporting range adjustment for different gas density ranges and adapting to the variable range requirements of different bellows.

[0020] As a preferred embodiment, the housing includes a cover mounted on one side of the cylinder, with windows spaced apart inside the cover, and a signal transmission outlet on the side wall of the cover. The spaced windows enable multi-functional integration of density value display, status indicator light, and alarm symbol, avoiding the need for multiple external instruments required in traditional designs. Operators can quickly obtain equipment status without tools, improving measurement efficiency. The output signal outlet on the side wall allows for directional cable routing, avoiding the risk of rainwater infiltration caused by openings on the top of traditional housings. Furthermore, placing the output signal outlet near the transmission components helps reduce internal cable length and minimizes poor contact caused by cable movement.

[0021] As a preferred embodiment, multiple sealing rings are provided between the housing and the viewing window. These sealing rings prevent external gases (such as humid air or corrosive gases) from entering the housing, avoiding oxidation or corrosion of internal components and ensuring long-term stability of measurement accuracy. The sealing ring material (such as silicone) absorbs the difference in thermal expansion between the housing and the viewing window, maintaining a stable seal within the gas density measurement system. Furthermore, the use of sealing rings (such as silicone rubber sealing rings or polyurethane sealing rings) effectively cushions vibrations or impacts to the viewing window, preventing direct collisions between the glass viewing window and the housing, which could lead to breakage. Attached Figure Description

[0022] Figure 1 The diagram shown is a structural schematic of the first embodiment of the bellows gas density measuring device of the present invention.

[0023] Figure 2 This is a schematic diagram of the second structure of the bellows gas density measuring device of the present invention.

[0024] Figure 3 This is a schematic diagram of the first motion state of the bellows gas density measuring device of the present invention.

[0025] Figure 4 This is a schematic diagram of the second motion state of the bellows gas density measuring device of the present invention.

[0026] Figure 5 The diagram shown is a structural schematic of a second embodiment of the bellows gas density measuring device of the present invention.

[0027] Figure 6 The diagram shown is a schematic representation of the adjusting component of the bellows gas density measuring device of the present invention.

[0028] Component designation explanation

[0029] 1. Cylinder

[0030] 2 connectors

[0031] 3 Corrugated Components

[0032] 31 First bellows

[0033] 32 Bottom Cover

[0034] 33 Second Corrugated Pipe

[0035] 34 Third Corrugated Pipe

[0036] 4. Transmission Components

[0037] 41 Transmission rod

[0038] 42 Adjusting components

[0039] 421 baffle

[0040] 422 outer cylinder

[0041] 423 Spring

[0042] 424 push rod

[0043] 43 Transmission Block

[0044] 5. Signal Transmission Components

[0045] 51 micro switch

[0046] 52 Terminal Block

[0047] 53 Terminal blocks

[0048] 6. Movement

[0049] 7 pointers

[0050] 8 dials

[0051] 9. Enclosure

[0052] 10 windows

[0053] 11 Sealing ring

[0054] 12 Case

[0055] 13 Exports Detailed Implementation

[0056] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0057] 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 the invention. 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 the invention, should still fall within the scope of the disclosed technical content. 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 the 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.

[0058] In this invention, 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 invention according to the specific circumstances.

[0059] 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.

[0060] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be 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 present invention and are not intended to limit the invention.

[0061] like Figures 1 to 2 As shown, the present invention provides a bellows gas density measuring device, comprising:

[0062] A cylinder 1, and a watch case 12 detachably connected to the cylinder 1;

[0063] One end of the cylinder 1 is provided with a connector 2 for connecting to the gas pipeline to be tested, and a corrugated assembly 3 is coaxially arranged inside the cylinder 1.

[0064] The corrugated assembly 3 includes: a first corrugated pipe 31, one end of which is connected to the connector 2, and the other end of which is sealed to the bottom cover 32; a second corrugated pipe 33, the end of which is sealed to the bottom cover 32; and a third corrugated pipe 34, which is coaxially sleeved inside the second corrugated pipe 33, and a closed cavity is formed between the bottom cover 32, the second corrugated pipe 33, and the third corrugated pipe 34.

[0065] The watch case 12 is equipped with a transmission component 4;

[0066] The transmission assembly 4 includes a transmission rod 41, the first shaft end of the transmission rod 41 is connected to the bottom cover 32, a transmission block 43 is sleeved on the transmission rod 41 near the second shaft end, and adjusting members 42 are provided on opposite sides of the transmission block 43, with the ends of the adjusting members 42 connected to the signal transmission assembly 5.

[0067] The inner wall of the watch case 12 that connects with the cylinder 1 is provided with a through hole 14, which simultaneously penetrates the inner wall of the watch case 12 and the inner wall of the cylinder 1 to form a through channel; the transmission rod 41 passes through the through hole 14 and can reciprocate linearly in the horizontal direction within the space defined by the through hole 14.

[0068] The second shaft end of the transmission rod 41 is connected to the core 6, and the end of the core 6 is connected to the pointer 7. A dial 8 is provided between the core 6 and the pointer 7, and the dial 8 is used to display the gas density value.

[0069] In some embodiments of the present invention, such as Figures 1 to 2As shown, when the temperature is constant, gas enters the first bellows 31 through the connector 2, causing displacement of the first bellows 31. (Under normal temperature conditions, changes in gas density are usually a slow process with relatively small amplitude. This minute density change does not cause large fluctuations in gas pressure, but rather changes in a gradual and smooth manner. The pointer 7 indicates the gas density value. To accurately display minute changes in gas density, the pointer 7 is usually designed to be quite sensitive. However, to ensure the stability and accuracy of the indication, the swing of the pointer 7...) The amplitude of movement is limited to a small range; after the minute displacement is transmitted to the movement 6, the movement 6 drives the pointer 7 to swing slightly, thus accurately indicating the subtle changes in gas density on the dial 8. This displacement causes the bottom cover 32, connected to the first bellows 31, to move, and the bottom cover 32 simultaneously pushes the transmission rod 41 to move; the movement of the transmission rod 41 triggers the micro switch 51 in the signal transmission assembly 5 through the transmission block 43 and the adjusting component 42, outputting a corresponding switching signal; the displacement of the transmission rod 41 drives the movement 6 to rotate, thereby driving the pointer 7 to indicate the current gas density value on the dial 8. The mechanical design of the transmission assembly 4 results in low wear rate of the mechanical structure between the bellows and the transmission assembly 4, helping to reduce maintenance frequency and extend the service life of the device; the micro switch 51 and the adjusting component 42 are designed as mechanical contacts, which are highly sensitive and can be replaced independently without overall disassembly, facilitating device maintenance.

[0070] In some embodiments of the present invention, such as Figure 3 As shown, when the temperature rises, the internal air pressure of the first bellows 31 increases, causing it to compress and expand, pushing the bottom cover 32 towards the second bellows 33 and the third bellows 34 (e.g., Figure 3 (As indicated by point A); simultaneously, the transmission rod 41 moves in the same direction as the second bellows 33 and the third bellows 34 (e.g., Figure 3 (As indicated by point A in the middle), the transmission rod 41 moves, pushing the movement 6 connected to its shaft end to rotate, thereby driving the pointer 7 to make a slight swing, so as to indicate the current gas density value on the dial 8; as the temperature rises, the compensating gas pressure inside the second bellows 33 and the third bellows 34 rises accordingly, pushing the bottom cover 32 to move towards the first bellows 31 (and...). Figure 3(As indicated at point A in the opposite direction); the bottom cover 32 moves, pulling the transmission rod 41 connected to it in the same direction as the bottom cover 32. The movement of the transmission rod 41 simultaneously pulls the mechanism 6 connected to its shaft end to rotate. The rotation of the mechanism 6 drives the pointer 7 connected to it to swing slightly in the opposite direction, thereby resetting the pointer 7. One end of the bottom cover 32 is pushed by the first bellows 31, and the other end is pushed by the second bellows 33 and the third bellows 34. The pushing forces at both ends increase synchronously, keeping the bottom cover 32 relatively stationary and keeping the indication and signal output parts of the mechanism 6 in a stable state. When the first bellows 31 (directly in contact with the gas to be measured) expands due to the increase in temperature, the second bellows 33 and the third bellows 34 (compensation units in the closed cavity) also expand due to the synchronous increase in temperature of the internal gas. The pushing forces at both ends are opposite in direction and matched in amplitude, keeping the position of the bottom cover 32 unchanged. Gas density depends only on the ratio of pressure to temperature (ideal gas law ρ = PM / RT), and this design directly counteracts the effect of temperature on pressure through physical structure, eliminating the need for electronic temperature sensors or software compensation algorithms. Compared to traditional single-bellows systems that produce erroneous outputs during temperature fluctuations, this design eliminates temperature-induced mechanical displacement, resulting in more accurate and reliable measurements. Furthermore, during temperature fluctuations, the elastic deformation of the bellows allows for thrust rebalancing in a very short time, achieving rapid response to transient temperature changes and avoiding the delay errors caused by thermal inertia in traditional systems.

[0071] In some embodiments of the present invention, such as Figure 4 As shown, when the temperature decreases, the internal air pressure of the first bellows 31 decreases, causing it to contract and pull the bottom cover 32 towards the first bellows 31 (e.g., Figure 4 (As indicated by point B); simultaneously, the compensating gas pressure inside the second bellows 33 and the third bellows 34 decreases accordingly, pulling the bottom cover 32 to move towards the second bellows 33 and the third bellows 34 (in line with...). Figure 4(The direction indicated at point B is opposite to the direction shown); the bottom cover 32 is subjected to the tension of the first bellows 31 at one end and the tension of the second bellows 33 and the third bellows 34 at the other end, and the tension at both ends increases synchronously, so that the bottom cover 32 remains relatively stationary, so that the indication and signal output of the mechanism 6 remains stable. The bellows assembly 3, which uses a multi-bellows combination, is designed so that the first bellows 31 directly senses the pressure change of the gas being measured, while the second bellows 33 and the third bellows 34 form a closed cavity for compensation. This effectively reduces the interference of environmental factors (such as temperature, vibration, etc.) on the measurement results, making the gas density measurement more accurate. This multi-level compensation mechanism can significantly reduce measurement errors, improve measurement accuracy, and more accurately reflect the actual changes in gas density. The tension generated by the first bellows 31 due to the decrease in gas pressure, and the reverse tension generated by the second bellows 33 and the third bellows 34 due to compensating for the decrease in gas pressure, achieve a force balance through bidirectional synchronous tension, realizing density measurement stability from low temperature to high temperature and eliminating the influence of temperature changes on the measurement results. When the temperature drops, the bottom cover 32 position remains absolutely stationary through synchronous reverse compensation of the multi-corrugated pipe, and the measured value does not change with the temperature.

[0072] In some embodiments of the present invention, such as Figures 1 to 2 As shown, the signal transmission component 5 includes micro switches 51, a terminal block 52, and terminals 53. Multiple micro switches 51 are symmetrically mounted on the terminal block 52, and each micro switch 51 is electrically connected to the terminal block 53. The symmetrical mounting of multiple micro switches 51 on the terminal block 52 can counteract the lateral forces or vibrations transmitted when the bellows and transmission rod 41 are displaced, preventing switch contact offset or deformation caused by unilateral force, maintaining stable contact pressure, reducing false triggering caused by mechanical vibration, and extending the service life of the micro switches 51. Furthermore, the centralized wiring design reduces wire harness crossing and the impact of electromagnetic interference. The symmetrical structure of the micro switches 51 on the terminal block 52 facilitates uniform heat distribution and avoids poor contact caused by localized overheating.

[0073] In some embodiments of the present invention, such as Figures 1 to 2As shown, multiple microswitches 51 are provided, each of which abuts against the end of the adjusting member 42. The multiple microswitches 51 are linked through the adjusting member 42, enabling multi-point synchronous detection of bellows displacement. This reduces detection blind spots caused by mechanical backlash or springback in a single switch, eliminates errors caused by mechanical hysteresis, and makes gas density measurement results more accurate. Furthermore, by having the end of the adjusting member 42 abut against each microswitch 51, the force on the adjusting member 42 is shared by multiple microswitches 51, preventing contact deformation or mechanical fatigue caused by concentrated stress in the adjusting member 42 and extending the service life of the component. Moreover, the symmetrical arrangement of the multiple microswitches 51 can counteract vibrations transmitted from the transmission rod 41 to the adjusting member 42, reducing the probability of false triggering between the adjusting member 42 and the microswitches 51, and ensuring the accuracy and safety of the response.

[0074] In some embodiments of the present invention, such as Figures 1 to 2 As shown, the central axis of the transmission rod 41 coincides with the central axis of the transmission block 43. This coaxial layout ensures that the axial displacement of the transmission rod 41 is converted into the linear motion of the transmission block 43, eliminating frictional losses and motion lag caused by lateral forces in traditional eccentric layouts. The thrust of the transmission rod 41, driven by the corrugated assembly 3, is transmitted along the same axis, resulting in uniform pressure distribution on the contact surface of the transmission block 43 and preventing localized stress concentration. The coaxial design of the transmission rod 41 and transmission block 43 avoids trajectory deviations caused by assembly errors or thermal deformation, reducing gas density measurement errors. Furthermore, since no additional guiding mechanism (such as a guide rail or bearing assembly) is required to constrain lateral displacement, compared to traditional complex structural designs, this device has a simple and reasonable structural design, saving manufacturing materials and reducing material and manufacturing costs.

[0075] In some embodiments of the present invention, such as Figures 1 to 2 ,as well as Figure 5 As shown, guide grooves (not shown) are provided on both sides of the transmission block 43. The adjusting member 42 is slidably installed in the guide grooves to adjust the sliding stroke. The guide grooves provide bidirectional constraints for the adjusting member 42, ensuring that it slides only in a preset direction, eliminating the lateral force caused by the tilt of the adjusting member 42 in traditional designs. In addition, the guide groove structure converts the lateral force on the adjusting member 42 into the positive pressure of the groove wall, forming a self-locking guide to avoid displacement drift caused by vibration or impact. The adjusting member 42 can slide freely and lock in the guide groove, supporting range adjustment for different gas density ranges and adapting to the variable range requirements of different bellows. For example, as Figure 6As shown, another embodiment of the adjusting member 42 is as follows: The adjusting member 42 includes: a baffle 421, an outer cylinder 422, a spring 423, and a push rod 424. The spring 423 is located inside the outer cylinder 422, and the push rod 424 passes through the spring 423 and the outer cylinder 422, pressing one end of the spring 423. The baffle 421 is fixed on the push rod 424 to prevent the push rod 424 from coming out of the cylinder 1. When the pressure drops, the push rod 424 presses the micro switch 51 and triggers the micro switch 51 to open. When the pressure continues to drop, due to the limited stroke of the micro switch 51, under a specific set pressure, before the pressure drops to 0, the push rod 424 has completely pressed the micro switch 51. At this time, the stroke of the micro switch 51 is 0, and the push rod 424 can no longer move. At this time, the outer cylinder 422 compresses the spring 423 to continue moving until the pressure drops to 0.

[0076] In some embodiments of the present invention, such as Figures 1 to 2 As shown, the housing 12 includes a cover 9 mounted on one side of the cylinder 1. The cover 9 has windows 10 spaced apart inside, and a signal transmission outlet 13 is provided on its side wall. The spaced windows 10 enable multi-functional integration of density value display, status indicator light, and alarm sign, avoiding the need for multiple external instruments in traditional designs. Operators can quickly obtain equipment status without tools, improving measurement efficiency. The output signal outlet 13 on the side wall allows for directional cable routing, avoiding the risk of rainwater infiltration caused by openings at the top of the traditional housing 12. Furthermore, placing the output signal outlet 13 near the transmission component 4 helps reduce internal cable length and minimizes poor contact caused by cable movement.

[0077] In some embodiments of the present invention, such as Figures 1 to 2 As shown, multiple sealing rings 11 are provided between the housing 9 and the viewing window 10. The sealing rings 11 between the housing 9 and the viewing window 10 can prevent external gases (such as humid air or corrosive gases) from entering the housing 9, avoiding oxidation or corrosion of internal components and ensuring long-term stability of measurement accuracy. The material of the sealing rings 11 (such as silicone) can absorb the difference in thermal expansion between the housing 9 and the viewing window 10, maintaining a stable seal inside the gas density measurement system. Furthermore, the use of sealing rings 11 (such as silicone rubber sealing rings 11 or polyurethane sealing rings 11) can effectively buffer vibrations or impacts to the viewing window 10, preventing the glass viewing window 10 from directly colliding with the housing 9 and causing breakage.

[0078] To better illustrate the bellows gas density measuring device of the present invention, the following specific application will be used as an example: In use, the bellows gas density measuring device of the present invention employs a multi-bellows combination bellows assembly 3 design. The first bellows 31 directly senses the pressure change of the gas to be measured. The second bellows 33 and the third bellows 34 form a closed cavity for compensation, effectively reducing the interference of environmental factors (such as temperature, vibration, etc.) on the measurement results, making the gas density measurement more accurate. This multi-level compensation mechanism can significantly reduce measurement errors, improve measurement accuracy, and more accurately reflect the actual changes in gas density. The close cooperation between the transmission assembly 4 and the bellows assembly 3 accurately transmits the minute displacement of the bellows to the movement 6 and the pointer 7, further ensuring the accuracy of the measurement results and enabling high-resolution gas density measurement.

[0079] The enclosed cavity design isolates the gas pressure changes inside the second and third bellows 33 and 34 from the external environment, reducing interference from external factors on the measurement system. When environmental factors such as temperature change, the gas inside the enclosed cavity provides buffering and compensation, making the movement of the bottom cover 32 and transmission rod 41 more stable, thus ensuring the stability and reliability of the measurement results. The coordinated operation of the multiple bellows makes the entire measurement system respond more smoothly to pressure changes, avoiding problems such as nonlinear deformation that may occur due to a single bellows, further improving the stability of the measurement.

[0080] Adjustable elements 42 connected to the signal transmission component 5 are provided on both sides of the transmission block 43. This design allows for precise adjustment and feedback of the movement of the transmission rod 41, ensuring the accuracy and reliability of signal transmission. When the bottom cover 32 moves due to changes in gas pressure, the transmission rod 41 drives the transmission block 43 to move, and the adjustable elements 42 can promptly transmit the movement information to the signal transmission component 5, achieving stable signal transmission. The stable connection between the signal transmission component 5 and the movement 6 ensures that the measured gas density information is accurately transmitted to the pointer 7 and the dial 8, guaranteeing the reliability of the display results.

[0081] The cylinder 1 and the case 12 are detachably connected, a design that makes assembly and maintenance of the device more convenient. In practical use, if a component malfunctions or needs replacement, the case 12 can be simply removed from the cylinder 1 for inspection or replacement of the internal components, eliminating the need to replace the entire device and significantly reducing maintenance and time costs. The detachable structure also facilitates cleaning and calibration of the device, ensuring its long-term performance and measurement accuracy.

[0082] The corrugated component 3 is coaxially arranged inside the cylinder 1, and the transmission component 4 is located between the watch case 12 and the cylinder 1. This compact structural design makes the whole device small in size and occupies little space.

[0083] In summary, the bellows gas density measuring device of the present invention has the following advantages:

[0084] 1. Multi-level compensation for precise density measurement:

[0085] The design employs a first bellows 31 to directly sense the pressure of the gas being measured, while the second bellows 33 and the third bellows 34 form a closed cavity for compensation. This effectively reduces interference from environmental factors such as temperature and vibration, significantly lowering measurement errors and achieving high-precision gas density measurement. The close cooperation between the transmission assembly 4 and the bellows assembly 3 precisely transmits the minute displacements of the bellows to the movement 6 and the pointer 7, further ensuring the accuracy of the measurement results and enabling high-resolution gas density measurement.

[0086] 2. The measurement results are stable and reliable:

[0087] The enclosed cavity design isolates the gas pressure changes inside the second bellows 33 and the third bellows 34 from the external environment, reducing interference from external factors on the measurement system. When environmental factors such as temperature change, the gas inside the enclosed cavity can provide a certain buffering and compensation effect, making the movement of the bottom cover 32 and the transmission rod 41 more stable, thereby ensuring the stability and reliability of the measurement results.

[0088] 3. Simple structure and small footprint:

[0089] The corrugated component 3 is coaxially arranged inside the cylinder 1, and the transmission component 4 is located between the watch case 12 and the cylinder 1. This compact structural design makes the whole device small in size and occupies little space.

[0090] 4. Easy to use and maintain:

[0091] The mechanical design of the transmission component 4 results in a low wear rate of the mechanical structure between the bellows and the transmission component 4, which helps to reduce the maintenance frequency and extend the service life of the device. The micro switch 51 and the adjusting component 42 are designed as mechanical contacts, which are highly sensitive and can be replaced independently without disassembling the whole device, making it easy to maintain the device.

[0092] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0093] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A bellows gas density measuring device, characterized in that, include: A cylinder, and a watch case detachably connected to the cylinder; One end of the cylinder is provided with a connector for connecting to the gas pipeline to be tested, and a corrugated assembly is coaxially arranged inside the cylinder. The corrugated assembly includes: a first corrugated pipe, one end of which is connected to the connector, and the other end of which is sealed to the bottom cover; a second corrugated pipe, the end of which is sealed to the bottom cover; and a third corrugated pipe, which is coaxially sleeved inside the second corrugated pipe, and a closed cavity is formed between the bottom cover, the second corrugated pipe, and the third corrugated pipe. The watch case contains a transmission component; The transmission assembly includes a transmission rod, the first shaft end of the transmission rod is connected to the bottom cover, a transmission block is sleeved on the transmission rod near the second shaft end, and adjusting members are provided on opposite sides of the transmission block, with the ends of the adjusting members connected to a signal transmission assembly. The inner wall of the watch case where it connects with the cylinder is provided with a through hole, which simultaneously penetrates the inner wall of the watch case and the inner wall of the cylinder to form a through channel; the transmission rod passes through the through hole and can reciprocate linearly in the horizontal direction within the space defined by the through hole; The second shaft end of the transmission rod is connected to a mechanism, and the end of the mechanism is connected to a pointer. A dial is provided between the mechanism and the pointer, and the dial is used to display the gas density value. When the temperature is constant, the gas enters the first bellows through the connector, causing the first bellows to move and the bottom cover connected to the first bellows to move. The bottom cover simultaneously pushes the transmission rod to move. The movement of the transmission rod triggers the micro switch in the signal transmission component through the transmission block and the adjusting component, and outputs the corresponding switching signal. The displacement of the transmission rod drives the movement to rotate, which in turn drives the pointer to indicate the current gas density value on the dial. When the temperature rises, the internal air pressure of the first bellows increases, causing it to compress and expand, pushing the bottom cover towards the second and third bellows. The compensating gas pressure inside the second and third bellows increases accordingly, pushing the bottom cover towards the first bellows. One end of the bottom cover is pushed by the first bellows, and the other end is pushed by the second and third bellows, with the pushing forces at both ends increasing synchronously, keeping the bottom cover relatively stationary and maintaining a stable state for the movement's indicator and signal output sections. When the temperature decreases, the internal air pressure of the first bellows decreases, causing it to contract and pull the bottom cover towards the first bellows. At the same time, the compensating gas pressure inside the second and third bellows decreases accordingly, pulling the bottom cover towards the second and third bellows. One end of the bottom cover is pulled by the first bellows, and the other end is pulled by the second and third bellows, with the pulling forces at both ends increasing synchronously. This keeps the bottom cover relatively stationary, ensuring that the movement indicator and signal output sections remain stable.

2. The bellows gas density measuring device according to claim 1, characterized in that: The signal transmission component includes micro switches, a terminal block, and terminals; a plurality of micro switches are symmetrically mounted on the terminal block, and the micro switches are electrically connected to the terminals.

3. The bellows gas density measuring device according to claim 2, characterized in that: Multiple microswitches are provided, and each microswitch abuts against the end of the adjusting member.

4. The bellows gas density measuring device according to claim 1, characterized in that: The central axis of the transmission rod coincides with the central axis of the transmission block.

5. The bellows gas density measuring device according to claim 1, characterized in that: The transmission block has guide grooves on both sides, and the adjusting member is slidably installed in the guide grooves to adjust the sliding stroke.

6. The bellows gas density measuring device according to claim 1, characterized in that: The watch case includes a cover mounted on one side of the cylinder, with windows spaced apart inside the cover, and a signal transmission outlet opened on the side wall of the cover.

7. The bellows gas density measuring device according to claim 6, characterized in that: Multiple sealing rings are provided between the cover and the viewing window.

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