Self-compensating corrugated pipe and self-compensating gas density measuring device

Abstract

The invention relates to the technical field of gas density measuring devices, and provides a self-compensating corrugated pipe which is characterized in that a plurality of compensating elastic parts are arranged to be attached to a plurality of corrugated elastic parts of a corrugated outer pipe, and the thermal expansion coefficients of the compensating elastic parts and the corrugated elastic parts are not consistent; when the temperature of gas in the self-compensation corrugated pipe changes, deformation of the compensation elastic pieces is different from that of the corrugated elastic pieces, so that the influence of temperature on deformation of the corrugated elastic pieces is overcome, and the self-compensation corrugated pipe can achieve temperature self-compensation. According to the self-compensation type gas density measuring device provided by the invention, the self-compensation corrugated pipe is used as a measuring mechanism, so that the device does not need to be additionally provided with a temperature compensation element such as a compensation gas chamber or a bimetallic strip, the structure is simplified, and the cost is reduced; the technical problems that a temperature compensation mode of existing gas density measuring equipment is complex in structure and high in cost are solved.

Description

Technical Field

[0001] The present application relates to the technical field of gas density measuring devices, and in particular to a self-compensating bellows and a self-compensating gas density measuring device. Background Art

[0002] Circuit breakers are important electrical equipment in power systems. When the power system is operating normally, they can realize the closing and opening operations of the circuit according to the control quality, thereby completing the distribution and control of electricity. When the power system is overloaded, short-circuited, undervoltage and other faults occur, they can automatically and quickly cut off the circuit to prevent the spread and expansion of the fault. If a circuit breaker fails, it will cause great economic losses. In order to ensure the reliability of the circuit breaker operation, a gas density relay can be used to monitor the density of sulfur hexafluoride gas in the circuit breaker in real time to ensure that it meets the requirements of relevant standards and ensure that the circuit breaker maintains a good working condition for a long time; at the same time, the gas density relay can also control the closing and opening operations of the circuit breaker through its node output signal. As a result, the circuit breaker and the gas density relay work together to ensure the safe and stable operation of the power system.

[0003] At present, gas density relays mainly use two methods: Bourdon tube measurement and bellows measurement. Among them, the bellows measurement method has better accuracy and sensitivity, but due to the characteristics of the bellows itself, it needs to compensate for the temperature when the ambient temperature changes.

[0004] The commonly used temperature compensation method is to use a closed compensation air chamber or add a bimetallic strip as a temperature compensation element.

[0005] Specifically, the temperature compensation method using a sealed compensation chamber is: when the ambient temperature changes, the gas pressure in the compensation chamber will also change accordingly, and the pressure change of the compensation chamber is compared and compensated with the pressure change of the measured gas. However, this compensation method requires a matching inflation structure and a sealing structure, as well as related equipment, which is expensive.

[0006] The method of using a bimetallic strip for temperature compensation is: connect one end of the bimetallic strip to a bellows and the other end to the movement; when the bellows senses the pressure of the gas to be measured and produces displacement, it drives the bimetallic strip to move, and uses the elastic deformation and displacement characteristics of the bimetallic strip to compensate for the pressure change of the bellows caused by temperature change, so that the pointer can indicate the gas density more accurately. However, this compensation method adds a bimetallic strip, which increases the structural complexity of the gas density relay and increases the cost. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a self-compensating bellows and a self-compensating gas density measuring device, which are used to solve the technical problems that the temperature compensation method of the existing gas density measuring equipment is complex in structure and high in cost.

[0008] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a self-compensating bellows, which comprises: a bellows outer tube, which is a corrugated shell including a plurality of corrugated elastic parts; a plurality of compensating elastic parts, each of which is connected to the bellows outer tube and fits together with each corrugated elastic part; wherein, when the gas density in the self-compensating bellows changes, each corrugated elastic part deforms under the action of the gas pressure, driving the overall extension or contraction of the corrugated outer tube; the compensating elastic parts and the corrugated elastic parts have inconsistent thermal expansion coefficients, and when the gas temperature in the self-compensating bellows changes, each compensating elastic part undergoes a deformation amount different from that of each corrugated elastic part, so as to overcome the influence of temperature on the deformation of each corrugated elastic part, thereby keeping the corrugated outer tube unchanged as a whole.

[0009] In some embodiments of the first aspect of the present application, the corrugated elastic member includes: a first corrugated connection part, a second corrugated connection part, a third corrugated connection part, a first corrugated bending part and a second corrugated bending part; wherein, the two ends of the first corrugated bending part are respectively connected to one end of the first corrugated connection part and one end of the second corrugated connection part, and the two ends of the second corrugated bending part are respectively connected to the other end of the second corrugated connection part and one end of the third corrugated connection part; under the action of gas pressure, the angle between each corrugated connection part and each corrugated bending part of the self-compensating bellows changes, and the corrugated elastic member expands or contracts, driving the overall extension or contraction of the corrugated outer tube; the compensating elastic member includes: a first compensating connection part, a second compensating connection part and a compensating bending part; wherein, the two ends of the compensating bending part are respectively connected to one end of the first compensating connection part and one end of the second compensating connection part; under the action of gas pressure, the angle between each compensating connection part and each compensating bending part of the self-compensating bellows changes, and the compensating elastic member expands or contracts.

[0010] In some embodiments of the first aspect of the present application, each compensation elastic member is respectively arranged on the inner side of each corrugated elastic member; wherein the first compensation connection portion, the compensation bending portion and the second compensation connection portion of each compensation elastic member are respectively fitted with the first corrugated connection portion, the first corrugated bending portion and the second corrugated connection portion of each corrugated elastic member; the thermal expansion coefficient of the compensation elastic member is smaller than the thermal expansion coefficient of the corrugated elastic member.

[0011] In some embodiments of the first aspect of the present application, each compensation elastic member is respectively arranged on the inner side of each corrugated elastic member; wherein the first compensation connection portion, the compensation bending portion and the second compensation connection portion of each compensation elastic member are respectively fitted with the second corrugated connection portion, the second corrugated bending portion and the third corrugated connection portion of each corrugated elastic member; the thermal expansion coefficient of the compensation elastic member is greater than the thermal expansion coefficient of the corrugated elastic member.

[0012] In some embodiments of the first aspect of the present application, each compensation elastic member is respectively arranged on the outside of each corrugated elastic member; wherein the first compensation connection portion, the compensation bending portion and the second compensation connection portion of each compensation elastic member are respectively fitted with the first corrugated connection portion, the first corrugated bending portion and the second corrugated connection portion of each corrugated elastic member; the thermal expansion coefficient of the compensation elastic member is greater than the thermal expansion coefficient of the corrugated elastic member.

[0013] In some embodiments of the first aspect of the present application, each compensation elastic member is respectively arranged on the outside of each corrugated elastic member; wherein the first compensation connection portion, the compensation bending portion and the second compensation connection portion of each compensation elastic member are respectively fitted with the second corrugated connection portion, the second corrugated bending portion and the third corrugated connection portion of each corrugated elastic member; the thermal expansion coefficient of the compensation elastic member is smaller than the thermal expansion coefficient of the corrugated elastic member.

[0014] To achieve the above-mentioned purpose and other related purposes, the second aspect of the present application provides a self-compensating gas density measuring device, the self-compensating gas density measuring device comprising: a measuring mechanism, comprising: a self-compensating bellows as described in any of the above-mentioned embodiments; a bellows top cover and a bellows bottom cover are respectively provided at both ends of the self-compensating bellows, and the formed closed air cavity is communicated with the gas to be measured through the air inlet hole on the bellows bottom cover, so that the gas to be measured flows into the closed air cavity; the bellows top cover is connected to one end of the driving mechanism, and the other end of the driving mechanism is connected to the indicating mechanism; wherein, when the gas density of the gas to be measured changes, the self-compensating bellows contracts or stretches under the action of the gas pressure, and drives the driving mechanism to move up and down, thereby driving the indicating mechanism to rotate and indicate the corresponding gas density value; when the gas temperature of the gas to be measured changes, the self-compensating bellows undergoes a deformation amount different from that of each corrugated elastic member through each compensating elastic member to overcome the influence of temperature on the deformation of each corrugated elastic member, so that the self-compensating bellows remains unchanged, and thereby the driving mechanism and the indicating mechanism remain unchanged.

[0015] In some embodiments of the second aspect of the present application, the driving mechanism includes: a guide rod, one end of which is connected to the bellows top cover via a cylindrical pin; when the self-compensating bellows contracts or extends, it drives the bellows top cover to move up and down, thereby driving the guide rod to move up and down; a slider, which is fixedly connected to the other end of the guide rod, and when the self-compensating bellows contracts or extends, the slider moves up and down following the guide rod; a first guide groove is provided on the slider, which is connected to the indicating mechanism, and when the slider moves up and down, it drives the indicating mechanism to rotate and indicates the corresponding gas density value.

[0016] In some embodiments of the second aspect of the present application, the indicating mechanism includes: a movement, including: a sector tooth and a pointer shaft meshingly connected to one end of the sector tooth through a gear structure; a second guide groove is provided at the other end of the sector tooth, and a first connecting member passes through the second guide groove and the first guide groove of the slider to connect the sector tooth and the slider; a pointer, one end of the pointer is connected to the pointer shaft; a dial, the dial is arranged between the movement and the pointer, and a side of the dial facing the pointer is marked with a scale of gas density value; when the slider moves up and down, it drives the sector tooth to rotate, and drives the pointer shaft to rotate through the gear structure, and then drives the pointer to rotate with the connection point with the pointer shaft as the center, and the pointer rotates and aligns with the scale marked on the dial, which is the gas density value of the gas to be measured.

[0017] In some embodiments of the second aspect of the present application, the self-compensating gas density measuring device also includes: a supporting mechanism; wherein the supporting mechanism includes: an outer cylinder covered outside the self-compensating bellows; an air inlet portion is provided at the lower end of the outer cylinder, and the air inlet portion is provided with an air inlet channel; the air inlet portion is fixedly connected to the bottom cover of the bellows, and is connected to a measuring air pipe for storing the gas to be measured, so that the air inlet channel is respectively connected to the closed air cavity and the gas to be measured; when the gas density of the gas to be measured changes, the gas pressure in the closed air cavity changes; a cylinder cover is provided at the upper end of the outer cylinder, and one or more support columns are provided on the top of the cylinder cover; an L-shaped support frame, including: a first support portion and a second support portion vertically arranged with the first support portion; the first support portion is fixedly connected to each of the support columns, and the second support portion is fixedly connected to the dial through one or more second connecting members.

[0018] As described above, the present application provides a self-compensating bellows, which is provided with a plurality of compensating elastic parts that fit with the plurality of corrugated elastic parts of the corrugated outer tube, and the thermal expansion coefficients of the compensating elastic parts and the corrugated elastic parts are inconsistent, so that when the temperature of the gas in the self-compensating bellows changes, each compensating elastic part undergoes a deformation amount different from that of each corrugated elastic part, so as to overcome the influence of temperature on the deformation of each corrugated elastic part, thereby enabling the self-compensating bellows to achieve temperature self-compensation. The present application provides a self-compensating gas density measuring device, which uses the self-compensating bellows as a measuring mechanism, so that the device does not need to install additional temperature compensation elements such as a compensating gas chamber or a bimetallic strip, thereby having the following beneficial effects: simplifying the structure of the self-compensating gas density measuring device and reducing costs, solving the technical problems of the complex structure and high cost of the temperature compensation method of the existing gas density measuring equipment; at the same time, the product process is simple and more suitable for mass production operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the cross-sectional structure of a self-compensating bellows in one embodiment of the present application.

[0020] Figure 2 Shown is a schematic structural diagram of a corrugated elastic member and a compensating elastic member in one embodiment of the present application.

[0021] Figure 3 Shown is a schematic structural diagram of a corrugated elastic member and a compensating elastic member in one embodiment of the present application.

[0022] Figure 4 Shown is a schematic structural diagram of a corrugated elastic member and a compensating elastic member in one embodiment of the present application.

[0023] Figure 5 Shown is a schematic structural diagram of a corrugated elastic member and a compensating elastic member in one embodiment of the present application.

[0024] Figure 6 Shown is a schematic structural diagram of a self-compensating gas density measuring device in one embodiment of the present application.

[0025] Figure 7 It shows a connection diagram of a measuring mechanism, a driving mechanism and an indicating mechanism in one embodiment of the present application.

[0026] Figure 8 Shown is a schematic structural diagram of a self-compensating gas density measuring device in one embodiment of the present application.

[0027] Fig. 9 Shown is a schematic diagram of the structure of a movement in one embodiment of the present application.

[0028] Component number description

[0029] 1. Measuring mechanism

[0030] 11 Self-compensating bellows

[0031] 111 Corrugated elastic parts

[0032] 111a First corrugated connecting portion

[0033] 111b Second corrugated connection portion

[0034] 111c Third corrugated connection part

[0035] 111d First corrugated bending part

[0036] 111e Second corrugated bending part

[0037] 112 Compensating elastic parts

[0038] 112a First compensation connection portion

[0039] 112b Second compensation connection portion

[0040] 112c Compensation bending section

[0041] 12 Bellows cover

[0042] 13 Bellows bottom cover

[0043] 131 Air Inlet

[0044] 14 Sealed air cavity

[0045] 2. Driving mechanism

[0046] 21 Guide rod

[0047] 22 Cylindrical pin

[0048] 23 Sliders

[0049] 231 First guide groove

[0050] 3 Indicating agency

[0051] 31 Movement

[0052] 311 Sector teeth

[0053] 312 Gear Structure

[0054] 313 Pointer axis

[0055] 314 Second guide groove

[0056] 315 First support plate

[0057] 316 Second support plate

[0058] 317 First fixed column

[0059] 318 Second fixed column

[0060] 319 Balance Spring

[0061] 32 Pointers

[0062] 33 Dial

[0063] 34 First connecting piece

[0064] 4 Support mechanism

[0065] 41 outer cylinder

[0066] 42 Air intake

[0067] 421 Intake channel

[0068] 43 cylinder cover

[0069] 431 Support Column

[0070] 44 L-shaped support frame

[0071] 441 First support part

[0072] 442 Second support part

[0073] 45 Second connecting piece DETAILED DESCRIPTION

[0074] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0075] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first connector and the second connector are only used to distinguish different connectors, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0076] In order to solve the problems in the above-mentioned background technology, the present invention provides a self-compensating bellows and a self-compensating gas density measuring device, aiming to solve the technical problems that the temperature compensation method of the existing gas density measuring equipment is complex in structure and has a high cost.

[0077] In order to make the purpose, technical solution and advantages of the present application more clear, the technical solution in the embodiments of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0078] like Figure 1 As shown, a schematic diagram of the structure of a self-compensating bellows 11 in an embodiment of the present application is shown. The self-compensating bellows 11 in this embodiment includes: a bellows outer tube and a plurality of compensating elastic members 112 connected to the bellows outer tube. The bellows outer tube is a pleated shell including a plurality of bellows elastic members 111, and each bellows elastic member 111 is respectively attached to each compensating elastic member 112.

[0079] It should be understood that the bellows can expand and contract under the action of external pressure. Based on this, it can be used as the main measuring element of the gas density measuring device. When the gas density of the gas to be measured changes, it can expand and contract under the action of gas pressure, thereby monitoring the gas density changes of the gas to be measured in real time.

[0080] According to the ideal gas state equation And the formula for calculating the amount of substance , the calculation formula for gas density can be obtained as .in, is the gas pressure, is the gas volume, is the amount of substance, is the molar gas constant, is the gas temperature, is the gas density, is the mass of the gas, is the molar mass of the gas.

[0081] It can be seen that for the same type of gas, its molar mass Fixed, when the gas temperature remains unchanged, the gas density is proportional to the gas pressure. That is, when the gas density of the gas to be measured increases, the gas pressure on the bellows also increases, and the bellows stretches and deforms; when the gas density of the gas to be measured decreases, the gas pressure on the bellows also decreases, and the bellows shrinks and deforms.

[0082] However, when the gas temperature changes, the gas pressure also changes. That is, when the gas temperature of the gas to be measured rises, the gas expands, and the gas pressure increases, the gas pressure on the bellows increases, which will cause the bellows to stretch and deform; similarly, when the gas temperature of the gas to be measured decreases, the gas pressure decreases, and the gas pressure on the bellows decreases, causing the bellows to shrink and deform. At this time, the deformation of the bellows due to temperature changes will seriously affect the accuracy of the monitored gas density.

[0083] In this embodiment, when the gas density in the self-compensating bellows changes, each bellows elastic member 111 is deformed under the action of the gas pressure, driving the overall extension or contraction of the bellows outer tube, thereby supporting the measurement of gas density.

[0084] More importantly, each compensation elastic member 112 is respectively fitted with each corrugated elastic member 111 , and the thermal expansion coefficients of the compensation elastic member 112 and the corrugated elastic member 111 are inconsistent, thereby forming a bimetallic structure.

[0085] It should be understood that a bimetallic structure refers to a composite structure composed of two different metals or alloy materials, and is composed of an active layer and a passive layer of metals with different thermal expansion coefficients. Among them, the thermal expansion coefficient of the active layer is greater than the thermal expansion coefficient of the passive layer. When the bimetallic structure is heated, the active layer expands a large distance, the passive layer expands a small distance, and the bimetallic structure bends toward the passive layer.

[0086] When the temperature of the gas in the self-compensating bellows changes, based on the bimetallic structure, each compensating elastic member 112 can undergo a deformation different from that of each corrugated elastic member 111, so as to overcome the influence of temperature on the deformation of each corrugated elastic member 111, thereby keeping the overall corrugated outer tube unchanged, thereby ensuring that the self-compensating bellows can achieve temperature self-compensation when used in a gas density measuring device, always indicating the gas density value at a specified temperature, and ensuring the accuracy of gas density measurement.

[0087] In one embodiment, if Figures 2 to 5 As shown, the corrugated elastic member 111 includes: a first corrugated connection portion 111a, a second corrugated connection portion 111b, a third corrugated connection portion 111c, a first corrugated bending portion 111d and a second corrugated bending portion 111e. The two ends of the first corrugated bending portion 111d are respectively connected to one end of the first corrugated connection portion 111a and one end of the second corrugated connection portion 111b; the two ends of the second corrugated bending portion 111e are respectively connected to the other end of the second corrugated connection portion 111b and one end of the third corrugated connection portion 111c. In a preferred embodiment, the first corrugated bending portion 111d and the second corrugated bending portion 111e are semicircular.

[0088] In this embodiment, under the action of gas pressure, the angle between each corrugated connecting portion and each corrugated bending portion of the self-compensating bellows changes, and the corrugated elastic member 111 expands or contracts, driving the overall extension or contraction of the corrugated outer tube.

[0089] like Figures 2 to 5 As shown, the compensation elastic member 112 is U-shaped, including: a first compensation connection portion 112a, a second compensation connection portion 112b and a compensation bend portion 112c. The two ends of the compensation bend portion 112c are respectively connected to one end of the first compensation connection portion 112a and one end of the second compensation connection portion 112b; when the gas density in the self-compensating bellows changes, the angle between each compensation connection portion and each compensation bend portion changes, and the compensation elastic member 112 expands or contracts. In a preferred embodiment, the compensation bend portion 112c is semicircular.

[0090] In this embodiment, under the action of gas pressure, the angle between each compensation connection portion and each compensation bending portion of the self-compensating bellows changes, and the compensation elastic member 112 expands or contracts.

[0091] In a specific embodiment, if Figure 2 As shown, each compensation elastic member 112 is respectively arranged inside each corrugated elastic member 111. The first compensation connection portion 112a, the compensation bending portion 112c and the second compensation connection portion 112b of each compensation elastic member 112 are respectively attached to the first corrugated connection portion 111a, the first corrugated bending portion 111d and the second corrugated connection portion 111b of each corrugated elastic member 111.

[0092] At this time, the thermal expansion coefficient of the compensation elastic member 112 is smaller than the thermal expansion coefficient of the corrugated elastic member 111 .

[0093] It should be understood that the thermal expansion coefficient is a physical quantity that characterizes the dimensional change characteristics of an object when heated. The calculation formula for the thermal expansion coefficient is: ;in, is the coefficient of thermal expansion, is the expansion deformation, is the initial amount, is the temperature change. When the material is constant, the greater the thermal expansion coefficient, the greater the expansion deformation.

[0094] When the gas temperature of the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensating elastic member 112 attached thereto increases, and under the action of the gas pressure, the corrugated elastic member 111 and the compensating elastic member 112 undergo elongation deformation, but due to the inconsistency of the thermal expansion coefficients, the compensating elastic member 112 undergoes an elongation deformation amount different from that of the corrugated elastic member 111. Specifically, the thermal expansion coefficient of the compensating elastic member 112 is smaller than that of the corrugated elastic member 111, and therefore, for the same temperature change, the elongation deformation amount of the compensating elastic member 112 is smaller than that of the corrugated elastic member 111. The compensating elastic member 112 fits with the corrugated elastic member 111, and the smaller elongation deformation of the compensating elastic member 112 causes the corrugated elastic member 111 to contract, thereby overcoming the elongation deformation of the corrugated elastic member 111, so that the corrugated elastic member 111 does not expand and contract due to temperature changes, thereby allowing the corrugated outer tube to remain unchanged as a whole when the temperature changes.

[0095] Similarly, when the gas temperature of the gas to be measured decreases, the gas pressure on the corrugated elastic member 111 and the compensating elastic member 112 fitted thereto decreases, and the corrugated elastic member 111 and the compensating elastic member 112 shrink and deform under the action of the gas pressure. However, since the thermal expansion coefficient of the compensating elastic member 112 is smaller than the thermal expansion coefficient of the corrugated elastic member 111, the shrinkage deformation of the compensating elastic member 112 is smaller than the shrinkage deformation of the corrugated elastic member 111. The compensating elastic member 112 and the corrugated elastic member 111 are fitted with each other, and the smaller shrinkage deformation of the compensating elastic member 112 causes the corrugated elastic member 111 to expand, overcome the shrinkage deformation of the corrugated elastic member 111, and prevent the corrugated elastic member 111 from expanding and deforming due to temperature changes, thereby keeping the corrugated outer tube unchanged as a whole when the temperature changes.

[0096] It should be noted that the material of the corrugated elastic member 111, the dimensions of each corrugated connecting portion and each corrugated bending portion, and the material of the compensation elastic member 112, the dimensions of each compensation connecting portion and each compensation bending portion can be set by the user according to needs, and this application does not limit them, but it must be satisfied that: the compensation elastic member 112 is adapted to the corrugated elastic member 111, and when the temperature changes by the same amount, the expansion and deformation between the two can be exactly offset, thereby achieving temperature self-compensation.

[0097] In a preferred embodiment, the corrugated elastic member 111 and the compensating elastic member 112 can be made of one of manganese-nickel-copper alloy, nickel-chromium-iron alloy, nickel-iron alloy, brass, stainless steel and aluminum alloy.

[0098] In a specific embodiment, if Figure 3As shown, each compensation elastic member 112 is respectively arranged inside each corrugated elastic member 111. The first compensation connection portion 112a, the compensation bending portion 112c and the second compensation connection portion 112b of each compensation elastic member 112 are respectively attached to the second corrugated connection portion 111b, the second corrugated bending portion 111e and the third corrugated connection portion 111c of each corrugated elastic member 111. At this time, the thermal expansion coefficient of the compensation elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111.

[0099] In this embodiment, the method of realizing temperature self-compensation by the compensation elastic member 112 and the corrugated elastic member 111 includes: when the gas temperature of the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensation elastic member 112 attached thereto increases, and the corrugated elastic member 111 and the compensation elastic member 112 are elongated and deformed, but because the thermal expansion coefficient of the compensation elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111, the elongation deformation amount of the compensation elastic member 112 is greater than the elongation deformation amount of the corrugated elastic member 111, and the larger elongation deformation amount of the compensation elastic member 112 causes the corrugated elastic member 111 to contract, thereby overcoming the elongation deformation amount of the corrugated elastic member 111; when The gas temperature of the gas to be measured decreases, and the gas pressure on the corrugated elastic member 111 and the compensating elastic member 112 fitted thereto decreases, and the corrugated elastic member 111 and the compensating elastic member 112 shrink and deform. However, since the thermal expansion coefficient of the compensating elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111, the shrinkage deformation of the compensating elastic member 112 is greater than the shrinkage deformation of the corrugated elastic member 111. The larger shrinkage deformation of the compensating elastic member 112 causes the corrugated elastic member 111 to expand, thereby overcoming the shrinkage deformation of the corrugated elastic member 111. Therefore, the corrugated elastic member 111 does not expand and contract due to temperature changes, and the corrugated outer tube remains unchanged as a whole when the temperature changes.

[0100] In a specific embodiment, if Figure 4 As shown, each compensation elastic member 112 is respectively arranged on the outside of each corrugated elastic member 111. The first compensation connection portion 112a, the compensation bending portion 112c and the second compensation connection portion 112b of each compensation elastic member 112 are respectively attached to the first corrugated connection portion 111a, the first corrugated bending portion 111d and the second corrugated connection portion 111b of each corrugated elastic member 111. At this time, the thermal expansion coefficient of the compensation elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111.

[0101] In this embodiment, the method of realizing temperature self-compensation by the compensation elastic member 112 and the corrugated elastic member 111 includes: when the gas temperature of the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensation elastic member 112 attached thereto increases, and the corrugated elastic member 111 and the compensation elastic member 112 are elongated and deformed, but because the thermal expansion coefficient of the compensation elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111, the elongation deformation amount of the compensation elastic member 112 is greater than the elongation deformation amount of the corrugated elastic member 111, and the larger elongation deformation amount of the compensation elastic member 112 causes the corrugated elastic member 111 to contract, thereby overcoming the elongation deformation amount of the corrugated elastic member 111; when the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensation elastic member 112 attached thereto increases, and the corrugated elastic member 111 and the compensation elastic member 112 are elongated and deformed. As the gas temperature of the measured gas decreases, the gas pressure on the corrugated elastic member 111 and the compensating elastic member 112 fitted thereto decreases, and the corrugated elastic member 111 and the compensating elastic member 112 shrink and deform. However, since the thermal expansion coefficient of the compensating elastic member 112 is greater than the thermal expansion coefficient of the corrugated elastic member 111, the shrinkage deformation of the compensating elastic member 112 is greater than the shrinkage deformation of the corrugated elastic member 111. The larger shrinkage deformation of the compensating elastic member 112 causes the corrugated elastic member 111 to expand, thereby overcoming the shrinkage deformation of the corrugated elastic member 111. Therefore, the corrugated elastic member 111 does not expand and contract due to temperature changes, and the corrugated outer tube remains unchanged as a whole when the temperature changes.

[0102] In a specific embodiment, if Figure 5 As shown, each compensation elastic member 112 is respectively arranged on the outside of each corrugated elastic member 111. The first compensation connection portion 112a, the compensation bending portion 112c and the second compensation connection portion 112b of each compensation elastic member 112 are respectively attached to the second corrugated connection portion 111b, the second corrugated bending portion 111e and the third corrugated connection portion 111c of each corrugated elastic member 111. At this time, the thermal expansion coefficient of the compensation elastic member 112 is smaller than the thermal expansion coefficient of the corrugated elastic member 111.

[0103] In this embodiment, the method of realizing temperature self-compensation by the compensation elastic member 112 and the corrugated elastic member 111 includes: when the gas temperature of the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensation elastic member 112 attached thereto increases, and the corrugated elastic member 111 and the compensation elastic member 112 are elongated and deformed, but because the thermal expansion coefficient of the compensation elastic member 112 is smaller than the thermal expansion coefficient of the corrugated elastic member 111, the elongation deformation amount of the compensation elastic member 112 is smaller than the elongation deformation amount of the corrugated elastic member 111, and the smaller elongation deformation amount of the compensation elastic member 112 causes the corrugated elastic member 111 to contract, thereby overcoming the elongation deformation amount of the corrugated elastic member 111; when the gas to be measured rises, the gas pressure on the corrugated elastic member 111 and the compensation elastic member 112 attached thereto increases, and the corrugated elastic member 111 and the compensation elastic member 112 are elongated and deformed. As the gas temperature of the measured gas decreases, the gas pressure on the corrugated elastic member 111 and the compensating elastic member 112 fitted thereto decreases, and the corrugated elastic member 111 and the compensating elastic member 112 shrink and deform. However, since the thermal expansion coefficient of the compensating elastic member 112 is smaller than that of the corrugated elastic member 111, the shrinkage deformation of the compensating elastic member 112 is smaller than that of the corrugated elastic member 111. The smaller shrinkage deformation of the compensating elastic member 112 causes the corrugated elastic member 111 to expand, thereby overcoming the shrinkage deformation of the corrugated elastic member 111. Therefore, the corrugated elastic member 111 does not expand and contract due to temperature changes, thereby allowing the corrugated outer tube to remain unchanged as a whole when the temperature changes.

[0104] It should be noted that, in other embodiments, each of the corrugated elastic members 111 can be fitted with two of the compensation elastic members 112 to form a bimetallic structure, wherein the two compensation elastic members 112 can be respectively arranged on the inner side and the outer side of the corrugated elastic member 111, or the compensation bending portions 112c of the two compensation elastic members 112 are respectively fitted with the first corrugated bending portion 111d and the second corrugated bending portion 111e. The two compensation elastic members 112 need to satisfy the following requirements: the two compensation elastic members 112 are adapted to the corrugated elastic member 111, and when the temperature changes by the same amount, the expansion deformation between the two compensation elastic members 112 and the corrugated elastic member 111 can be exactly offset, thereby achieving temperature self-compensation.

[0105] like Figure 6 FIG. 2 is a schematic diagram showing the structure of a self-compensating gas density measuring device in an embodiment of the present invention. The self-compensating gas density measuring device comprises: a measuring mechanism 1 , a driving mechanism 2 and an indicating mechanism 3 .

[0106] The measuring mechanism 1 comprises: the self-compensating bellows 11 as described in any of the above embodiments. It should be understood that the specific structure and working principle of the self-compensating bellows 11 have been described in detail in the above embodiments, and will not be repeated here for the sake of brevity.

[0107] like Figure 6 as well as Figure 7 As shown, the two ends of the self-compensating bellows 11 are respectively provided with a bellows top cover 12 and a bellows bottom cover 13. Figure 6 As shown, the formed closed air cavity 14 is communicated with the gas to be measured through the air inlet hole 131 on the bellows bottom cover 13 , so that the gas to be measured flows into the closed air cavity 14 .

[0108] And, if Figures 6 to 8 As shown, the bellows top cover 12 is connected to one end of the driving mechanism 2 , and the other end of the driving mechanism 2 is connected to the indicating mechanism 3 .

[0109] In this embodiment, the self-compensating gas density measuring device performs gas density measurement in the following manner: when the gas density of the gas to be measured changes, the self-compensating bellows 11 contracts or stretches under the action of the gas pressure, and drives the driving mechanism 2 to move up and down, thereby driving the indicating mechanism 3 to rotate and indicate the corresponding gas density value; at the same time, when the gas temperature of the gas to be measured changes, the self-compensating bellows 11 undergoes a deformation amount different from that of each corrugated elastic member 111 through each compensating elastic member 112 to overcome the influence of temperature on the deformation of each corrugated elastic member 111, so that the self-compensating bellows 11 remains unchanged, thereby keeping the driving mechanism 2 and the indicating mechanism 3 unchanged.

[0110] In one embodiment, if Figures 6 to 8 As shown, the driving mechanism 2 includes: a guide rod 21 and a slider 23. Among them, one end of the guide rod 21 is connected to the bellows top cover 12 through a cylindrical pin 22; when the self-compensating bellows 11 contracts or extends, it drives the bellows top cover 12 to move up and down, thereby driving the guide rod 21 to move up and down. The slider 23 is fixedly connected to the other end of the guide rod 21. When the self-compensating bellows 11 contracts or extends, the slider 23 moves up and down following the guide rod 21. The slider 23 is provided with a first guide groove 231, which is connected to the indicating mechanism 3. When the slider 23 moves up and down, it drives the indicating mechanism 3 to rotate and indicate the corresponding gas density value.

[0111] In one embodiment, if Figure 6 As shown, the indicating mechanism 3 includes: a movement 31 , a pointer 32 and a dial 33 .

[0112] like Figure 7As shown, the movement 31 includes: a sector tooth 311 and a pointer shaft 313 meshingly connected with one end of the sector tooth 311 through a gear structure 312. A second guide groove 314 is provided at the other end of the sector tooth 311, and a first connecting member 34 passes through the second guide groove 314 and the first guide groove 231 of the slider 23 to connect the sector tooth 311 and the slider 23.

[0113] like Figure 7 As shown, one end of the pointer 32 is connected to the pointer shaft 313. Figure 6 As shown, the dial 33 is arranged between the movement 31 and the pointer 32, and the dial 33 is marked with a scale of gas density values ​​on a side facing the pointer 32.

[0114] In this embodiment, when the slider 23 moves up and down, it drives the sector teeth 311 to rotate, and drives the pointer shaft 313 to rotate through the gear structure 312, thereby driving the pointer 32 to rotate around the connection point with the pointer shaft 313. After the pointer 32 rotates, it aligns with the scale marked on the dial 33, which indicates the gas density value of the gas to be measured.

[0115] In a specific embodiment, if Fig. 9 As shown, the movement 31 further includes: a first support plate 315 and a second support plate 316 respectively arranged on both sides of the sector tooth 311. The first support plate 315 and the second support plate 316 are connected by one or more first fixing columns 317, and are connected to the sector tooth 311 by a second fixing column 318, so as to support the sector tooth 311. The movement 31 further includes: a hairspring 319. The hairspring 319 is arranged on the gear structure 312, and is connected to the pointer shaft 313 through the gear structure 312. When the sector tooth 311 rotates, the gear structure 312, the pointer shaft 313 and the pointer 32 will be driven to rotate. The hairspring 319 can generate a reaction torque to eliminate the meshing clearance between the gear structure 312 and the sector tooth 311, the unstable state of the pointer caused by the clearance at the junction of the driving mechanism 2 and the indicating mechanism 3, etc., to ensure that the indication of the pointer 32 is accurate and stable, and help the pointer 32 to quickly return to zero after the gas pressure is eliminated.

[0116] In one embodiment, if Figure 6 as well as Figure 8 As shown, the self-compensating gas density measuring device further includes a supporting mechanism 4. The supporting mechanism 4 is used to fix and support various mechanism components in the self-compensating gas density measuring device. Specifically, the supporting mechanism 4 includes an outer cylinder 41, a cylinder cover 43 and an L-shaped supporting frame 44.

[0117] like Figure 6 as well as Figure 8 As shown, the outer tube 41 is covered outside the self-compensating bellows 11, and an air inlet 42 is provided at its lower end. The air inlet 42 is provided with an air inlet channel 421, and the air inlet 42 is fixedly connected to the bottom cover 13 of the bellows, and is connected to the measuring air pipe for storing the gas to be measured, so that the air inlet channel 421 is respectively connected to the closed air cavity 14 and the gas to be measured. As a result, the gas to be measured in the measuring air pipe enters the closed air cavity 14 through the air inlet channel 421 and the air inlet hole 131, so that the closed air cavity 14 is filled with the gas to be measured, and then when the gas density of the gas to be measured changes, the gas pressure in the closed air cavity 14 changes synchronously, and the self-compensating gas density measuring device can measure and monitor the change of the gas density of the gas to be measured based on the change of the gas density in the closed air cavity 14.

[0118] like Figure 8 As shown, the cylinder cover 43 is arranged at the upper end of the outer cylinder 41, and one or more support columns 431 are arranged on the top of the cylinder cover 43. The L-shaped support frame 44 includes: a first support portion 441 and a second support portion 442 arranged perpendicular to the first support portion 441. The first support portion 441 is fixedly connected to each of the support columns 431, and the second support portion 442 is fixedly connected to the dial 33 through one or more second connecting members 45.

[0119] In a specific embodiment, the self-compensating gas density measuring device performs gas density measurement in the following manner: when the gas density of the gas to be measured changes, the self-compensating bellows 11 contracts or stretches under the action of the gas pressure, and drives the bellows top cover 12, the cylindrical pin 22, the guide rod 21 and the slider 23 to move up and down in turn, thereby driving the sector teeth 311 to rotate, and driving the pointer shaft 313 to rotate through the gear structure 312, thereby driving the pointer 32 to rotate around the connection point with the pointer shaft 313, and after the pointer 32 rotates and aligns with the scale marked on the dial 33, it indicates the gas density value of the gas to be measured. Since the self-compensating bellows 11 has a temperature self-compensation function, even when the gas temperature changes, the multiple compensating elastic members 112 therein undergo deformation amounts different from those of the corrugated elastic members 111, which can overcome the influence of temperature on the deformation of the corrugated elastic members 111, so that the self-compensating bellows 11 does not expand and contract due to temperature changes, thereby causing the pointer 32 to always indicate the gas density value at a specified temperature, thereby ensuring the accuracy of the gas density measurement performed by the self-compensating gas density measuring device.

[0120] The purpose of the design of the present application in this embodiment is that the present application improves the structure of the bellows itself and adds a compensating elastic member to the bellows so that the bellows itself has a bimetallic structure and can self-compensate for temperature changes. Therefore, the self-compensating gas density measuring device does not need to install additional gas compensation or bimetallic compensation devices, saving a lot of structure, and the product process is simple, the cost is greatly reduced, and it is more suitable for mass production operations.

[0121] It should be noted that, in one embodiment, the self-compensating gas density measuring device may also be provided with a micro switch and a remote transmission mechanism.

[0122] The micro switch is a switch with a small contact interval and a quick-action mechanism. In the self-compensating gas density measuring device, when the expansion and contraction deformation of the self-compensating bellows 11 due to the change in gas density reaches a preset value, the micro switch will be pushed, so that the normally open node or the normally closed node of the micro switch will act quickly to realize the on and off of the circuit, thereby providing a node signal to feedback the working status of the self-compensating gas density measuring device and transmit the gas density change of the gas to be measured to an external monitoring system or other related equipment.

[0123] Specifically, under normal circumstances, the normally open node of the micro switch is in an open state, and the normally closed node is in a closed state; when the self-compensating gas density measuring device detects that the gas density is lower than or higher than the preset normal working range, the micro switch is actuated, and an alarm signal is sent to an external monitoring system or other related equipment by closing the normally open node or disconnecting the normally closed node; when the gas density is seriously abnormal, the gas density is detected to be lower than or higher than the preset alarm range, and a serious abnormal node signal is sent to cut off the power supply of the self-compensating gas density measuring device through the relevant control device, so that the self-compensating gas density measuring device stops running and realizes the locking function. This prevents equipment failure or accidents caused by gas density problems and protects the safety of equipment and personnel.

[0124] The remote transmission mechanism includes various types of sensors to provide remote transmission signals, so that the staff can timely grasp the operating status of the self-compensating gas density measuring device. The sensors include but are not limited to: temperature sensors, humidity sensors and pressure sensors, etc., which are respectively used to monitor the gas parameters such as gas temperature, humidity and pressure in the self-compensating gas density measuring device in real time. When each sensor detects that the gas parameters deviate from the normal range, the remote transmission mechanism sends a remote transmission signal to the external monitoring system or other related equipment to timely warn the staff and remind them to check and handle as soon as possible to avoid equipment failure or accidents due to abnormal gas parameters. In addition, the external monitoring system can also store, analyze and count the gas parameters obtained by remote transmission. By analyzing the changing trend of gas parameters, the health status of the equipment can be evaluated, providing a basis for the maintenance and overhaul of the equipment, and realizing the refined management of the equipment.

[0125] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0126] In summary, the present application provides a self-compensating bellows, which is provided with a plurality of compensating elastic parts that fit with the plurality of corrugated elastic parts of the corrugated outer tube, and the thermal expansion coefficients of the compensating elastic parts and the corrugated elastic parts are inconsistent, so that when the temperature of the gas in the self-compensating bellows changes, each compensating elastic part undergoes a deformation amount different from that of each corrugated elastic part, so as to overcome the influence of temperature on the deformation of each corrugated elastic part, thereby enabling the self-compensating bellows to achieve temperature self-compensation. The present application provides a self-compensating gas density measuring device, which uses the self-compensating bellows as a measuring mechanism, so that the device does not need to install additional temperature compensation elements such as a compensating gas chamber or a bimetallic strip, thereby having the following beneficial effects: simplifying the structure of the self-compensating gas density measuring device and reducing costs, solving the technical problems of the complex structure and high cost of the temperature compensation method of the existing gas density measuring equipment; at the same time, the product process is simple and more suitable for mass production operations.

[0127] Therefore, the present application effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0128] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A self-compensating bellows, characterized in that: include: A corrugated outer tube, the corrugated outer tube being a corrugated shell including a plurality of corrugated elastic members (111); A plurality of compensation elastic members (112), each compensation elastic member (112) being connected to the corrugated outer tube and being mutually fitted with each corrugated elastic member (111); When the gas density in the self-compensating bellows changes, each bellows elastic member (111) is deformed under the action of the gas pressure, driving the overall bellows outer tube to extend or contract; The thermal expansion coefficients of the compensating elastic member (112) and the corrugated elastic member (111) are inconsistent, and when the temperature of the gas in the self-compensating bellows changes, each compensating elastic member (112) undergoes a deformation amount different from that of each corrugated elastic member (111), so as to overcome the influence of temperature on the deformation of each corrugated elastic member (111), thereby keeping the overall corrugated outer tube unchanged.

2. The self-compensating bellows according to claim 1, characterized in that: The corrugated elastic member (111) comprises: a first corrugated connection portion (111a), a second corrugated connection portion (111b), a third corrugated connection portion (111c), a first corrugated bending portion (111d), and a second corrugated bending portion (111e); wherein two ends of the first corrugated bending portion (111d) are respectively connected to one end of the first corrugated connection portion (111a) and one end of the second corrugated connection portion (111b), and two ends of the second corrugated bending portion (111e) are respectively connected to the other end of the second corrugated connection portion (111b) and one end of the third corrugated connection portion (111c); under the action of gas pressure, the angle between each corrugated connection portion and each corrugated bending portion of the self-compensating bellows changes, and the corrugated elastic member (111) expands or contracts, driving the overall extension or contraction of the corrugated outer tube; The compensating elastic member (112) comprises: a first compensating connection portion (112a), a second compensating connection portion (112b) and a compensating bent portion (112c); wherein two ends of the compensating bent portion (112c) are respectively connected to one end of the first compensating connection portion (112a) and one end of the second compensating connection portion (112b); and under the action of gas pressure, the angle between each compensating connection portion and each compensating bent portion of the self-compensating bellows changes, and the compensating elastic member (112) expands or contracts.

3. The self-compensating bellows according to claim 2, characterized in that: Each compensation elastic member (112) is respectively arranged on the inner side of each corrugated elastic member (111); wherein the first compensation connection portion (112a), the compensation bending portion (112c) and the second compensation connection portion (112b) of each compensation elastic member (112) are respectively fitted with the first corrugated connection portion (111a), the first corrugated bending portion (111d) and the second corrugated connection portion (111b) of each corrugated elastic member (111); and the thermal expansion coefficient of the compensation elastic member (112) is smaller than the thermal expansion coefficient of the corrugated elastic member (111).

4. The self-compensating bellows according to claim 2, characterized in that: Each compensation elastic member (112) is respectively arranged on the inner side of each corrugated elastic member (111); wherein the first compensation connection portion (112a), the compensation bending portion (112c) and the second compensation connection portion (112b) of each compensation elastic member (112) are respectively fitted with the second corrugated connection portion (111b), the second corrugated bending portion (111e) and the third corrugated connection portion (111c) of each corrugated elastic member (111); and the thermal expansion coefficient of the compensation elastic member (112) is greater than the thermal expansion coefficient of the corrugated elastic member (111).

5. The self-compensating bellows according to claim 2, characterized in that: Each compensation elastic member (112) is respectively arranged on the outside of each corrugated elastic member (111); wherein the first compensation connection portion (112a), the compensation bending portion (112c), and the second compensation connection portion (112b) of each compensation elastic member (112) are respectively fitted with the first corrugated connection portion (111a), the first corrugated bending portion (111d), and the second corrugated connection portion (111b) of each corrugated elastic member (111); and the thermal expansion coefficient of the compensation elastic member (112) is greater than the thermal expansion coefficient of the corrugated elastic member (111).

6. The self-compensating bellows according to claim 2, characterized in that: Each compensation elastic member (112) is respectively arranged on the outside of each corrugated elastic member (111); wherein the first compensation connection portion (112a), the compensation bending portion (112c) and the second compensation connection portion (112b) of each compensation elastic member (112) are respectively fitted with the second corrugated connection portion (111b), the second corrugated bending portion (111e) and the third corrugated connection portion (111c) of each corrugated elastic member (111); and the thermal expansion coefficient of the compensation elastic member (112) is smaller than the thermal expansion coefficient of the corrugated elastic member (111).

7. A self-compensating gas density measuring device, characterized in that: include: A measuring mechanism (1), comprising: a self-compensating bellows (11) according to any one of claims 1 to 6; a bellows top cover (12) and a bellows bottom cover (13) are respectively provided at two ends of the self-compensating bellows (11), and a closed air cavity (14) formed therein is communicated with a gas to be measured via an air inlet hole (131) on the bellows bottom cover (13), so that the gas to be measured flows into the closed air cavity (14); the bellows top cover (12) is connected to one end of a driving mechanism (2), and the other end of the driving mechanism (2) is connected to an indicating mechanism (3); When the gas density of the gas to be measured changes, the self-compensating bellows (11) contracts or stretches under the action of the gas pressure, and drives the driving mechanism (2) to move up and down, thereby driving the indicating mechanism (3) to rotate and indicate the corresponding gas density value; When the temperature of the gas to be measured changes, the self-compensating bellows (11) causes each compensation elastic member (112) to deform differently from each corrugated elastic member (111) to overcome the effect of temperature on the deformation of each corrugated elastic member (111), thereby keeping the self-compensating bellows (11) unchanged, and further keeping the driving mechanism (2) and the indicating mechanism (3) unchanged.

8. The self-compensating gas density measuring device according to claim 7, characterized in that: The driving mechanism (2) comprises: A guide rod (21), one end of the guide rod (21) being connected to the bellows top cover (12) via a cylindrical pin (22); when the self-compensating bellows (11) contracts or extends, the bellows top cover (12) is driven to move up and down, thereby driving the guide rod (21) to move up and down; A slider (23), the slider (23) being fixedly connected to the other end of the guide rod (21), and when the self-compensating bellows (11) contracts or extends, the slider (23) moves up and down following the guide rod (21); a first guide groove (231) is provided on the slider (23), and is connected to the indicating mechanism (3); when the slider (23) moves up and down, it drives the indicating mechanism (3) to rotate and indicates a corresponding gas density value.

9. The self-compensating gas density measuring device according to claim 8, characterized in that: The indicating mechanism (3) comprises: The movement (31) comprises: a sector tooth (311) and a pointer shaft (313) meshingly connected to one end of the sector tooth (311) via a gear structure (312); a second guide groove (314) is provided at the other end of the sector tooth (311); a first connecting member (34) passes through the second guide groove (314) and the first guide groove (231) of the slider (23) to connect the sector tooth (311) and the slider (23); A pointer (32), one end of the pointer (32) being connected to the pointer shaft (313); A dial (33), the dial (33) being arranged between the movement (31) and the pointer (32), and having a scale indicating a gas density value on a side thereof facing the pointer (32); When the slider (23) moves up and down, it drives the sector teeth (311) to rotate, and drives the pointer shaft (313) to rotate through the gear structure (312), thereby driving the pointer (32) to rotate around the connection point with the pointer shaft (313). After the pointer (32) rotates and aligns with the scale marked on the dial (33), it indicates the gas density value of the gas to be measured.

10. The self-compensating gas density measuring device according to claim 9, characterized in that: Also includes: Support mechanism (4); Wherein, the supporting mechanism (4) comprises: An outer cylinder (41) is arranged outside the self-compensating bellows (11); an air inlet portion (42) is arranged at the lower end of the outer cylinder (41), and the air inlet portion (42) is provided with an air inlet passage (421); the air inlet portion (42) is fixedly connected to the bottom cover (13) of the bellows, and is connected to a measuring air pipe for storing the gas to be measured, so that the air inlet passage (421) is respectively connected to the closed air cavity (14) and the gas to be measured; when the gas density of the gas to be measured changes, the gas pressure in the closed air cavity (14) changes; A cylinder cover (43) is arranged at the upper end of the outer cylinder (41), and one or more support columns (431) are arranged on the top of the cylinder cover (43); The L-shaped support frame (44) comprises: a first support portion (441) and a second support portion (442) arranged perpendicular to the first support portion (441); the first support portion (441) is fixedly connected to each of the support columns (431), and the second support portion (442) is fixedly connected to the dial (33) via one or more second connecting members (45).

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