Sub-control type density monitoring equipment and method with stroke increment

Abstract

The invention discloses sub-control type density monitoring equipment with stroke increment and a method. The sub-control type density monitoring equipment comprises an electric control valve, a mechanism shell, and a sampling control device, a signal triggering device, a stroke increment mechanism, a first corrugated pipe and a deformation compensation device which are positioned in the mechanism shell, an elastic deformation transmission device is arranged on a signal switch contact of the signal triggering device, one end of a first corrugated pipe is connected with an air inlet of a mechanism shell through an air pipe, the air inlet is communicated with an electric control valve, and the other end of the first corrugated pipe is in transmission connection with a first deformation quantity input end of a stroke increment mechanism. The deformation compensation device is in transmission connection with the second deformation input end of the stroke increment mechanism, and the deformation output end of the stroke increment mechanism is in transmission connection with the elastic deformation transmission device. According to the invention, gas density monitoring accuracy and early warning reliability are improved, and normal operation of high-voltage electrical equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a separate control type density monitoring device and method with stroke increment. Background Art

[0002] In the electrical equipment of the power industry, the operation and normal work of high-voltage power electrical equipment are inseparable from the sulfur hexafluoride gas medium used for arc extinguishing and insulation. Therefore, in sulfur hexafluoride electrical products equipped with a sealed sulfur hexafluoride gas chamber, it is a very important basic requirement to ensure that the gas chamber does not leak. If the gas leaks, the reduction in gas density will seriously affect the electrical performance of the equipment and will pose a serious hidden danger to the safe operation of the equipment.

[0003] At present, with the development of unmanned substations towards networking and digitalization, online monitoring of the gas density status of SF6 electrical equipment has been widely used, and online monitoring of the gas density value in SF6 high-voltage electrical equipment has also become more common.

[0004] The operating environment of high-voltage substations is harsh. Especially during system operation, high vibrations will be generated, which will lead to a decrease in the detection accuracy of the density relay and even damage the mechanical structure or electronic components of the density relay. At the same time, changes in the temperature inside the shell will also affect the detection accuracy and other functions of the SF6 gas density relay, making it difficult to provide reliable early warning or timely detection of abnormal sulfur hexafluoride gas density conditions. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a sub-control density monitoring device and method with stroke increment, overcome the influence of some external factors, improve the accuracy of gas density monitoring and early warning reliability, and ensure the normal operation of high-voltage power electrical equipment.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A sub-control type density monitoring device with stroke increments, comprising a density detection mechanism and an electrically controlled valve for connecting a gas chamber where the gas to be measured is located;

[0008] The density detection mechanism comprises a mechanism housing and a sampling control device, a signal trigger device, a stroke increment mechanism, a first bellows and a deformation compensation device located in the mechanism housing. The signal switch contact of the signal trigger device is provided with an elastic deformation transmission device. The sampling control device is used for sampling the gas pressure value in the mechanism housing and the internal temperature of the housing.

[0009] One end of the first bellows is connected to the air inlet of the mechanism housing through an air pipe, the air inlet is communicated with the electric control valve, the other end of the first bellows is transmission-connected to the first deformation input end of the stroke increment mechanism, the deformation compensation device is transmission-connected to the second deformation input end of the stroke increment mechanism, and the deformation output end of the stroke increment mechanism is transmission-connected to the elastic deformation transmission device;

[0010] The sampling control device is electrically connected to the signal trigger device and the electric control valve respectively, and the deformation compensation device can provide a corresponding deformation amount according to the change of the internal temperature of the shell;

[0011] The stroke increment mechanism is used to adjust the output of the deformation variable output end according to the input of the first deformation variable input end and the second deformation variable input end, and the elastic deformation transmission device is used to trigger the signal triggering device after completing the preset total deformation amount.

[0012] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0013] A method for density monitoring with a separate control type and a stroke increment is applied to the above-mentioned separate control type density monitoring device with a stroke increment, and comprises the following steps:

[0014] S1. Install the electric control valve and density detection mechanism on the air chamber of the device under test, start the device and adjust the preset total deformation of the elastic deformation transmission device;

[0015] S2, determining whether a trigger signal from a signal trigger device is received, if so, it indicates that the output of the deformation variable output end obtained by adjusting the input of the first deformation variable input end and the second deformation variable input end by the stroke increment mechanism has caused the elastic deformation transmission device to complete a preset total deformation amount, and executing step S3;

[0016] S3. Trigger an alarm, and obtain the real-time gas density value of the measured gas according to the current air pressure in the mechanism shell and the current internal temperature of the shell obtained by the sampling control device.

[0017] The beneficial effects of the present invention are as follows: providing a sub-control density monitoring device and method with stroke increment, an electric control valve and a density detection mechanism are arranged on the gas chamber of the device to be measured, the measured gas is connected to the first bellows, the current air pressure in the sampling mechanism shell of the sampling control device and the current internal temperature of the shell are used, the gas density change of the measured gas is sensed by the first bellows to generate a deformation variable, and then the deformation variable is transmitted to the elastic deformation transmission device through the stroke increment mechanism, causing the elastic deformation transmission device to deform, and the elastic deformation is used to reduce the influence of vibration, and at the same time, a deformation compensation device is introduced to correct the deformation variable finally applied to the elastic deformation transmission device by the stroke increment mechanism, and the error generated by the measurement of the gas pressure by the temperature is fed back to the elastic deformation transmission device. When the signal trigger device is triggered, it indicates that the actual gas density has reached the warning condition corresponding to the preset total deformation amount, and the real-time gas density value of the measured gas is obtained according to the current air pressure and the current internal temperature of the shell, thereby improving the accuracy of gas density monitoring and the reliability of warning, and ensuring the normal operation of high-voltage electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a sub-control density monitoring device with stroke increment of the present invention;

[0019] Figure 2 It is a circuit diagram of a non-self-checking circuit of a sub-control density monitoring device with stroke increment of the present invention;

[0020] Figure 3 It is a circuit diagram of a self-calibration of a separate control type density monitoring device with stroke increment according to the present invention;

[0021] Figure 4 It is a side view of the internal structure of a density detection mechanism of a separate control type density monitoring device with stroke increment of the present invention;

[0022] Figure 5 It is a simplified diagram of the internal structure of a density detection mechanism of a separate control type density monitoring device with stroke increment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of an hour hand display device of a density detection mechanism of a separate control type density monitoring device with stroke increment according to the present invention;

[0024] Figure 7 It is a schematic diagram of the cooperation between the stroke increasing mechanism and the elastic deformation transmission device of a separate control type density monitoring device with stroke increment of the present invention;

[0025] Figure 8 It is a structural schematic diagram of a stroke increasing mechanism of a separate control type density monitoring device with stroke increment according to the present invention;

[0026] Fig. 9 It is a schematic diagram of the steps of a separate control type density monitoring method with stroke increment of the present invention.

[0027] Description of labels:

[0028] 1. Mechanism housing; 2. Air pressure sensor; 3. Temperature sensor; 4. Electric control valve; 5. Air pressure regulating device; 6. Contact signal acquisition unit; 7. Main controller; 8. Adapter; 9. Multi-way connector; 10. Equipment under test;

[0029] 101, mechanical housing; 102, base; 103, Baden tube; 104, temperature compensation sheet; 105, movement; 106, pointer; 107, dial; 108, end seat; 109, signal trigger device; 110, elastic deformation transmission device; 111, trigger arm gear shaft; 112, limiter; 113, third stroke incremental swing rod; 114A, second stroke incremental swing rod; 114B, first stroke incremental swing rod; 115B, first transmission gear shaft; 115A, second transmission gear shaft; 116B, first bellows; 116A, second bellows; 117, upper cover; 118, base; 119, fixed support rod; 120, side plate; 121, lever; 122, fixing nut; 123, air pipe; 124, electronic housing; 125, junction box;

[0030] 501, heating chamber; 502, heating component; 503, protective housing;

[0031] 1101, trigger rod; 1102, cover; 1103, spring; 1104, adjustment member; 1105, adjustment nut; 1106, adjustment screw;

[0032] 114B1, first fixing member; 114B2, first sector tooth member; 114B3, first connecting member;

[0033] 114A1, second fixing member; 114A2, second sector tooth member; 114A3, second connecting member;

[0034] 1131. A third sector tooth member; 1132. A third fixing member; 1133. A third connecting member. DETAILED DESCRIPTION

[0035] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0036] Please refer to Figures 1 to 8 , a sub-control type density monitoring device with stroke increment, comprising a density detection mechanism and an electrically controlled valve 4 for connecting a gas chamber where the gas to be measured is located;

[0037] The density detection mechanism comprises a mechanism housing 1 and a sampling control device, a signal trigger device 109, a stroke increment mechanism, a first bellows 116B and a deformation compensation device located in the mechanism housing 1. The signal switch contact of the signal trigger device 109 is provided with an elastic deformation transmission device 110. The sampling control device is used for sampling the gas pressure value in the mechanism housing 1 and the internal temperature of the housing;

[0038] One end of the first bellows 116B is connected to the air inlet of the mechanism housing 1 through the air pipe 123, and the air inlet is communicated with the electric control valve 4. The other end of the first bellows 116B is transmission-connected to the first deformation input end of the stroke increment mechanism, the deformation compensation device is transmission-connected to the second deformation input end of the stroke increment mechanism, and the deformation output end of the stroke increment mechanism is transmission-connected to the elastic deformation transmission device 110.

[0039] The sampling control device is electrically connected to the signal trigger device 109 and the electric control valve 4 respectively, and the deformation compensation device can provide a corresponding deformation amount according to the change of the internal temperature of the shell;

[0040] The stroke increment mechanism is used to adjust the output of the deformation output terminal according to the input of the first deformation input terminal and the second deformation input terminal, and the elastic deformation transmission device 110 is used to trigger the signal triggering device 109 after completing the preset total deformation amount.

[0041] From the above description, it can be seen that the effect of the present invention lies in: an electric control valve 4 and a density detection mechanism are arranged on the gas chamber of the device under test 10, the gas under test is connected to the first bellows 116B, the current air pressure in the sampling mechanism housing 1 of the sampling control device and the current temperature inside the housing are used, and the gas density change of the gas under test is sensed by the first bellows 116B to generate a deformation variable, and then the deformation variable is transmitted to the elastic deformation transmission device 110 through the stroke increment mechanism, causing the elastic deformation transmission device 110 to deform, and the elastic deformation is used to reduce the influence of vibration. At the same time, a deformation compensation device is introduced to correct the deformation variable finally applied to the elastic deformation transmission device 110 by the stroke increment mechanism, and the error generated by the measurement of the gas pressure due to the temperature is fed back to the elastic deformation transmission device 110. When the signal trigger device 109 is triggered, it means that the actual gas density has reached the warning condition corresponding to the preset total deformation amount. According to the current air pressure and the current temperature inside the housing, the real-time gas density value of the gas under test is obtained, thereby improving the accuracy of gas density monitoring and the reliability of warning, and ensuring the normal operation of high-voltage electrical equipment.

[0042] Furthermore, it also includes a multi-way connector 9 and a gas pressure regulating device 5;

[0043] The output end of the air pressure regulating device 5 is communicated with the interior of the mechanism housing 1 through the multi-way connector 9 , and the sampling control device is electrically connected to the air pressure regulating device 5 .

[0044] From the above description, it can be seen that the air pressure regulating device 5 is introduced. Before the equipment is put into operation, the air pressure regulating device 5 can be used to adjust the air pressure in the mechanism housing 1 to make it change slowly until the signal triggering device 109 is triggered, and the real-time gas density value at this time is recorded to complete the calibration of the equipment, or the air pressure regulating device 5 is started according to the preset gas density value for early warning, so as to confirm the preset total deformation that the elastic deformation transmission device 110 should have, to ensure accurate early warning during the monitoring process.

[0045] Further, the deformation compensation device includes a second bellows 116A;

[0046] The second bellows 116A is in transmission connection with the second deformation input end of the stroke increment mechanism, and a compensating gas is sealed in the second bellows 116A;

[0047] The gas pressure of the compensating gas can be changed according to the change of the temperature inside the housing.

[0048] From the above description, it can be seen that the deformation compensation device uses the deformation characteristics of the second bellows 116A as a medium and seals the compensation gas inside it, so that the compensation gas is only affected by the temperature inside the shell and the pressure changes. It should be noted that in the initial state, the first bellows 116B and the second bellows 116A have zero deformation input, and the deformation input of the second bellows 116A is a reverse correction of the deformation input of the first bellows 116B.

[0049] Further, the stroke increment mechanism includes a limit assembly, a first transmission gear shaft 115B, a second transmission gear shaft 115A, a lever 121, a fixed support rod 119, a trigger arm gear shaft 111, a limit member 112, a first stroke increment swing rod 114B, a second stroke increment swing rod 114A and a third stroke increment swing rod 113;

[0050] The position limiting assembly is disposed in the mechanism housing 1, and the first bellows 116B and the second bellows 116A are both located in the position limiting assembly;

[0051] One end of the first bellows 116B away from the air pipe 123 is sealed and connected to one end of the first transmission gear shaft 115B, one end of the second bellows 116A is sealed and connected to one end of the first transmission gear shaft 115B, one end of the fixed support rod 119 is connected to the limit assembly, and the other end of the fixed support rod 119 is rotatably connected to a position on the lever 121 corresponding to the midpoint of the lever 121;

[0052] One end of the lever 121 is connected to the other end of the first transmission gear shaft 115B through the first stroke incremental swing rod 114B, one end of the lever 121 is connected to one end of the third stroke incremental swing rod 113 through the side facing the limit assembly, and the other end of the lever 121 is connected to the other end of the second transmission gear shaft 115A through the second stroke incremental swing rod 114A.

[0053] The limiter 112 is disposed in the mechanism housing 1 , the trigger arm gear shaft 111 is movably disposed on the limiter 112 , and the other end of the third stroke increment rocker 113 is transmission-connected to the elastic deformation transmission device 110 via the trigger arm gear shaft 111 .

[0054] From the above description, it can be seen that the stroke increment mechanism realizes the transmission of deformation according to the principle of the lever 121, and the first bellows 116B and the second bellows 116A are respectively connected to the two ends of the lever 121, so that the deformations generated by the two have opposite effects, thereby realizing reverse correction; specifically, the deformation is transmitted by using the gear shaft and the stroke increment rocker, and the matching structure of the gear shaft and the stroke increment rocker is also adopted at the deformation output end of the stroke increment mechanism, so that the deformation of the first bellows 116B and the second bellows 116A themselves is converted into the deformation influence on the elastic deformation transmission device 110.

[0055] Furthermore, the elastic deformation transmission device 110 includes a limit cover 1102, a trigger rod 1101, a spring 1103 and a connecting assembly;

[0056] The limit cover 1102 is disposed in the mechanism housing 1, one end of the connecting component located in the limit cover 1102 is connected to one end of the trigger rod 1101 located in the limit cover 1102, and the other end of the trigger rod 1101 passes through the limit cover 1102 and is disposed opposite to the signal switch contact of the signal trigger device 109;

[0057] The spring 1103 is sleeved on the trigger rod 1101, and the two ends of the spring 1103 are respectively connected to the inner wall of the limit cover 1102 and the connecting component. The other end of the connecting component passes through the limit cover 1102 and is connected to one end of the trigger arm gear shaft 111 away from the third stroke incremental rocker 113. The length of the connecting component is adjustable.

[0058] From the above description, it can be seen that the elastic deformation transmission device 110 relies on the trigger rod 1101, the spring 1103 and the connecting component to form a basic transmission link, and the spring 1103 is used to reduce the impact of vibration on the transmission process; and the length of the connecting component is adjustable, which can be adjusted according to the actual alarm conditions, that is, the preset total deformation amount that the elastic deformation transmission device 110 should have is changed accordingly.

[0059] Further, the connection assembly includes an adjustment member 1104, an adjustment screw 1106 and an adjustment nut 1105;

[0060] One end of the adjusting member 1104 is connected to one end of the trigger rod 1101 located in the limiting cover 1102, the other end of the adjusting member 1104 passes through the limiting cover 1102 and is provided with a threaded hole, one end of the adjusting screw 1106 is threadedly connected to the threaded hole, the other end of the adjusting screw 1106 is connected to one end of the trigger arm gear shaft 111 away from the third stroke incremental rocker 113, and the adjusting nut 1105 is sleeved on the adjusting screw 1106.

[0061] From the above description, it can be seen that the connecting assembly uses an adjusting member 1104, an adjusting screw 1106 and an adjusting nut 1105 to form a length-adjustable connecting structure. The adjustment is achieved by rotating the adjusting nut 1105 to change the depth of the adjusting screw 1106 entering the threaded hole. It is not only stable but also capable of more precise fine-tuning and is flexible to use.

[0062] Furthermore, it also includes a pointer 106 display device, a Baden tube 103, a base 102 and a temperature compensation sheet 104;

[0063] The base 102 is disposed in the mechanism housing 1, one end of the Baden tube 103 is sealedly connected to the air pipe 123 through the base 102, and the other end of the Baden tube 103 is transmission-connected to the movement 105 of the pointer 106 display device through the temperature compensation sheet 104;

[0064] The deformation amount of the temperature compensation sheet 104 can be changed according to the change of the temperature inside the housing.

[0065] From the above description, it can be known that the Baden tube 103 is an elastic element, that is, under the pressure of the measured gas, the end of the Baden tube 103 is forced to produce corresponding elastic deformation and displacement, and then the corrected displacement is transmitted to the movement 105 through the reverse correction of the temperature compensation sheet 104, and the movement 105 transmits it to the pointer 106 of the pointer display device, and the measured gas density value is indicated on the dial 107. In this way, the density relay has the function of eliminating the influence of temperature on pressure, thereby displaying the density value of the gas.

[0066] Further, the pointer 106 display device includes an end base 108, a dial 107 and a pointer 106;

[0067] The scale plate 107 is disposed in the mechanism housing 1 , the Baden tube 103 is connected to the temperature compensation sheet 104 via the end seat 108 , and the pointer 106 is disposed on the scale plate 107 via the movement 105 .

[0068] As can be seen from the above description, the gas density is displayed by combining the pointer 106 and the dial 107, which facilitates intuitive understanding of the change in gas density and can improve the degree of refinement.

[0069] Furthermore, the sampling control device includes a main controller 7, an air pressure sensor 2 and a temperature sensor 3;

[0070] The air pressure sensor 2 is arranged on the air pipe 123, and the main controller 7 and the temperature sensor 3 are both arranged in the mechanism housing 1;

[0071] The main controller 7 is electrically connected to the air pressure sensor 2 , the temperature sensor 3 , the signal trigger device 109 , the electric control valve 4 and the air pressure regulating device 5 respectively.

[0072] From the above description, it can be seen that the sampling control part adopts the main controller 7 as the control core, and samples the internal air pressure of the mechanism housing 1 and the internal temperature of the housing through the air pressure sensor 2 and the temperature sensor 3 respectively.

[0073] Please refer to Fig. 9 A method for density monitoring with a stroke increment is applied to the above-mentioned density monitoring device with a stroke increment, and comprises the following steps:

[0074] S1. Install the electric control valve 4 and the density detection mechanism on the air chamber of the device under test 10, start the device and adjust the preset total deformation of the elastic deformation transmission device 110;

[0075] S2, determining whether a trigger signal from the signal trigger device 109 is received, if so, it indicates that the output of the deformation variable output end obtained by adjusting the input of the first deformation variable input end and the second deformation variable input end by the stroke increment mechanism has caused the elastic deformation transmission device 110 to complete the preset total deformation amount, and executing step S3;

[0076] S3. Trigger an alarm, and obtain the real-time gas density value of the measured gas according to the current air pressure in the mechanism housing 1 and the current internal temperature of the housing obtained by the sampling control device.

[0077] From the above description, it can be seen that the effect of the present invention lies in: an electric control valve 4 and a density detection mechanism are arranged on the gas chamber of the device under test 10, the gas under test is connected to the first bellows 116B, the current air pressure in the sampling mechanism housing 1 of the sampling control device and the current temperature inside the housing are used, and the gas density change of the gas under test is sensed by the first bellows 116B to generate a deformation variable, and then the deformation variable is transmitted to the elastic deformation transmission device 110 through the stroke increment mechanism, causing the elastic deformation transmission device 110 to deform, and the elastic deformation is used to reduce the influence of vibration. At the same time, a deformation compensation device is introduced to correct the deformation variable finally applied to the elastic deformation transmission device 110 by the stroke increment mechanism, and the error generated by the measurement of the gas pressure due to the temperature is fed back to the elastic deformation transmission device 110. When the signal trigger device 109 is triggered, it means that the actual gas density has reached the warning condition corresponding to the preset total deformation amount. According to the current air pressure and the current temperature inside the housing, the real-time gas density value of the gas under test is obtained, thereby improving the accuracy of gas density monitoring and the reliability of warning, and ensuring the normal operation of high-voltage electrical equipment.

[0078] Please refer to Figures 1 to 9 , Embodiment 1 of the present invention is:

[0079] A sub-control density monitoring device with stroke increment includes an electric control valve 4, an air pressure regulating device 5, a contact signal acquisition unit 6, a density detection mechanism and a multi-way connector 9. The density detection mechanism includes a mechanism housing 1 and a main controller 7, an air pressure sensor 2, a temperature sensor 3, a signal trigger device 109, a stroke increment mechanism, a first bellows 116B and a deformation compensation device located in the mechanism housing 1. The signal switch contact of the signal trigger device 109 is provided with an elastic deformation transmission device 110, and the sampling control device is used to sample the gas pressure value in the mechanism housing 1 and the internal temperature of the housing;

[0080] like Figure 1 As shown, one end of the electric control valve 4 is fixed on the air inlet of the device under test 10, and the other end of the electric control valve 4 is fixed on the lower end of the multi-way connector 9. The air inlet of the mechanism housing 1 is connected through the multi-way connector 9 and the adapter 8. The electric control valve 44 is also connected to the main controller 7 and is opened or closed under the control of the main controller 7.

[0081] In the mechanism housing 1, one end of the first bellows 116B is connected to the air inlet of the mechanism housing 1 through the air pipe 123, and the air inlet is connected to the electric control valve 4. The other end of the first bellows 116B is connected to the first deformation input end of the stroke increment mechanism, the deformation compensation device is connected to the second deformation input end of the stroke increment mechanism, and the deformation output end of the stroke increment mechanism is connected to the elastic deformation transmission device 110; the deformation compensation device can provide a corresponding deformation according to the change of the internal temperature of the housing; the stroke increment mechanism is used to adjust the output of the deformation output end according to the input of the first deformation input end and the second deformation input end, and the elastic deformation transmission device 110 is used to trigger the signal trigger device 109 after completing the preset total deformation. The main controller 7 is electrically connected to the air pressure sensor 2, the temperature sensor 3, the signal trigger device 109, the electric control valve 4 and the air pressure regulating device 5 respectively.

[0082] The air pressure regulating device 5 is connected to the mechanism housing 1 through a multi-way connector 9. For example, the air pressure regulating device 5 is fixed on the right port of the multi-way connector 9, and the air pressure regulating device 5 is connected to the mechanism housing 1 in the air path. The air pressure regulating device 5 is configured to adjust the gas pressure rise and fall of the mechanism housing 1 so that the signal trigger device 109 is triggered. Specifically, the air pressure regulating device 5 includes a protective housing 503 and a heating chamber 501 and a heating component 502 located in the protective housing 503. The heating chamber 501 is connected to the air pipe 123, and the gas pressure value of the heating chamber 501 is adjusted by heating the heating component 502. Among them, the mechanism housing 1 includes a mechanical housing 101 and an electronic housing 124, and the mechanical housing 101 and the electronic housing 124 are independent or separated from each other. The main controller 7, the air pressure sensor 2 and the temperature sensor 3 are all located in the electronic housing 124. The mechanism housing 1 can also be provided with a junction box 125 to facilitate wiring of the device with other external devices.

[0083] The signal trigger device 109 is configured as a contact signal of the density detection mechanism. The main controller 7 can be an embedded system based on a microprocessor with an embedded algorithm and control program to automatically control the entire monitoring process, including all peripherals, logic and input and output. Figure 2 For example, the main controller 7 shown can be implemented by a general-purpose computer, an industrial computer, a CPU, a single-chip microcomputer, an ARM chip, an AI chip, a quantum chip, a photonic chip, an MCU, an FPGA, a PLC, an industrial control mainboard, an embedded main control board, etc. The main controller 7 also has a human-computer interaction function: it has a data display interface that can refresh the current data value in real time; it has a data input function that can input parameter setting values. The electrical interface of the density detection mechanism can have a protection function, and misconnection will not cause damage to the interface. The main controller 7 realizes long-distance transmission of information through a communication module, and the communication module is arranged on the electronic housing 124 or the mechanical housing 101.

[0084] In this embodiment, the main controller 7 controls the opening and closing of the electric control valve 4, ensuring that the density detection mechanism is connected to the device under test 10 on the gas path when in the working state. The density detection mechanism can safely monitor the gas density of the electrical equipment, so that the electrical equipment can work safely and reliably.

[0085] At the same time, combined Figure 2 and Figure 3 As shown, a contact signal acquisition unit 6 is provided on the density detection mechanism; in the calibration state, the density detection mechanism is not connected to the device under test 10 in the gas path, and the online calibration of the gas density relay will not affect the safe operation of the electrical equipment. This embodiment can realize the online calibration of the density detection mechanism, improve the efficiency, reduce the operation and maintenance cost, and at the same time, the whole calibration process realizes zero emission of SF6 gas, meets the requirements of environmental protection regulations, and is conducive to promotion and application.

[0086] In this embodiment, a sub-control density monitoring device with stroke increment is used. The measured gas is connected to the first bellows 116B, and the current air pressure in the sampling mechanism shell 1 of the sampling control device and the current internal temperature of the shell are used to sense the change in gas density of the measured gas through the first bellows 116B to generate a deformation variable, and then the deformation variable is transmitted to the elastic deformation transmission device 110 through the stroke increment mechanism, causing the elastic deformation transmission device 110 to deform, and the elastic deformation is used to reduce the influence of vibration. At the same time, a deformation compensation device is introduced to correct the deformation variable finally applied to the elastic deformation transmission device 110 by the stroke increment mechanism, and the error caused by the temperature measurement of the gas pressure is fed back to the elastic deformation transmission device 110. When the signal trigger device 109 is triggered, it indicates that the actual gas density has reached the warning condition corresponding to the preset total deformation amount, and the real-time gas density value of the measured gas is obtained according to the current air pressure and the current internal temperature of the shell.

[0087] Among them, Figure 4 and Figure 5 As shown, the deformation compensation device includes a second bellows 116A; the second bellows 116A is transmission-connected to the second deformation input end of the stroke increment mechanism, and a compensation gas is enclosed in the second bellows 116A; the gas pressure of the compensation gas can change according to the change of the temperature inside the shell. In addition, the density detection mechanism also includes a temperature sensing bag, and the compensation gas set in the second bellows 116A is connected to the temperature sensing bag through the connecting gas pipe 123, which can increase the amount of compensation gas and facilitate the setting of the temperature measurement position of the temperature sensing bag.

[0088] Please refer to Figures 4 to 8 , Embodiment 2 of the present invention is:

[0089] A density monitoring device with a stroke increment is provided. Based on the above embodiment 1, Figure 7 and Figure 8 As shown, the stroke increment mechanism includes a limit assembly, a first transmission gear shaft 115B, a second transmission gear shaft 115A, a lever 121, a fixed support rod 119, a trigger arm gear shaft 111, a limit piece 112, a first stroke increment swing rod 114B, a second stroke increment swing rod 114A and a third stroke increment swing rod 113; the limit assembly is arranged in the mechanism housing 1, and the first bellows 116B and the second bellows 116A are both located in the limit assembly; one end of the first bellows 116B away from the air pipe 123 is sealed and connected to one end of the first transmission gear shaft 115B, one end of the second bellows 116A is sealed and connected to one end of the first transmission gear shaft 115B, one end of the fixed support rod 119 is connected to the limit assembly, and the fixed support rod 119 The other end of the lever 121 is rotatably connected to the position on the lever 121 corresponding to the midpoint of the lever 121; one end of the lever 121 is transmission-connected to the other end of the first transmission gear shaft 115B through the first stroke incremental rocker 114B on the side facing the limit assembly, and one end of the lever 121 is connected to one end of the third stroke incremental rocker 113 on the side away from the limit assembly, and the other end of the lever 121 is transmission-connected to the other end of the second transmission gear shaft 115A through the second stroke incremental rocker 114A on the side facing the limit assembly; the limit member 112 is arranged in the mechanism housing 1, the trigger arm gear shaft 111 is movably arranged on the limit member 112, and the other end of the third stroke incremental rocker 113 is transmission-connected to the elastic deformation transmission device 110 through the trigger arm gear shaft 111.

[0090] Combination Figure 4 and Figure 5It can be seen that the first bellows 116B is connected to the measured gas on the gas path as a pressure measuring element; when the gas density value changes and reaches the set value, the first bellows 116B is compressed or expanded to generate axial displacement, and the displacement stroke increment is amplified through the transmission of the first transmission gear shaft 115B and the first stroke increment rocker 114B, and the lever 121 is driven to swing with the fixed support rod 119 as the force fulcrum, and then the third stroke increment rocker 113 is driven to secondary amplify the displacement stroke increment and transmit it to the trigger arm gear shaft 111; the trigger arm gear shaft 111 generates axial displacement under the limiting action of the limit member 112, and then drives the elastic deformation transmission device 110 to trigger the signal switch contacts on the signal trigger device 109 to generate a corresponding signal. At the same time, the second bellows 116A is sealed as a gas compensation element and filled with a certain amount of compensation gas. The pressure of the compensation gas will change with the change of temperature. The pressure change causes the second bellows 116A to produce corresponding axial displacement, which is transmitted to the second stroke incremental rocker 114A through the second transmission gear shaft 115A. Since the axial displacement of the second bellows 116A and the displacement produced by the first bellows 116B are in a linear relationship of reaction, the pressure of the gas caused by the temperature change is offset, and the change relationship between the pressure and temperature of the measured gas is reversely corrected, eliminating the influence of temperature on pressure, thereby realizing gas density monitoring of the contact signal.

[0091] Among them, the first stroke incremental rocker 114B is composed of a first sector tooth 114B2, a first connecting member 114B3 and a first fixed member 114B1, the first fixed member 114B1 is arranged at one end of the lever 121, and the first sector tooth 114B2 is rotatably arranged on the limit assembly through the first connecting member 114B3, one end of the first sector tooth 114B2 is hinged or connected to the first fixed member 114B1 with a movable chain shaft, and the other end of the first sector tooth 114B2 is meshed and connected with the first transmission gear shaft 115B; the second stroke incremental rocker 114A is composed of a second sector tooth 114A2, a second connecting member 114A3 and a second fixed member 114A1, the second fixed member 114A1 is arranged at the other end of the lever 121, and the second sector tooth 114A2 is rotatably arranged on the first transmission gear shaft 115B through the second connecting member 114A3. On the limiting assembly, one end of the second sector tooth 114A2 is hinged or connected to the second fixed member 114A1 by a movable chain shaft, and the other end of the second sector tooth 114A2 is meshed and transmission-connected with the second movable gear shaft; the third stroke incremental rocker 113 is composed of a third sector tooth 1131, a third connecting member 1133 and a third fixed member 1132, the third fixed member 1132 is arranged at the end of the lever 121, and the third sector tooth 1131 is rotatably arranged in the mechanism housing 1 through the third connecting member 1133, one end of the third sector tooth 1131 is hinged or connected to the third fixed member 1132 by a movable chain shaft, and the other end of the third sector tooth 1131 is meshed and transmission-connected with the third transmission gear shaft; the composition structure of each stroke incremental rocker is similar, and all adopt a movable hinge or shaft connection to ensure free rotation and maintain a minimum gap.

[0092] Among them, the limiting assembly includes a base 118, an upper cover plate 117, a side plate 120 and a fixing nut 122. The upper cover plate 117, the side plate 120 and the base 118 form a fixed support frame, which is fixed in the mechanism housing 1 by the fixing nut 122. The first bellows 116B and the second bellows 116A are both located in the fixed support frame, and the first transmission gear shaft 115B and the second transmission gear shaft 115A are arranged through the upper cover plate 117, and the fixed support member is arranged on the surface of the upper cover plate 117.

[0093] In this embodiment, if Figure 7As shown, the elastic deformation transmission device 110 includes a limit cover 1102, a trigger rod 1101, a spring 1103 and a connecting component; the limit cover 1102 is arranged in the mechanism housing 1, one end of the connecting component located in the limit cover 1102 is connected to the end of the trigger rod 1101 located in the limit cover 1102, and the other end of the trigger rod 1101 passes through the limit cover 1102 and is arranged opposite to the signal switch contact of the signal trigger device 109; the spring 1103 is sleeved on the trigger rod 1101, and the two ends of the spring 1103 are respectively connected to the inner side wall of the limit cover 1102 and the connecting component, and the other end of the connecting component passes through the limit cover 1102 and It is connected to one end of the trigger arm gear shaft 111 away from the third stroke incremental rocker 113, and the length of the connecting assembly is adjustable; as a preferred design, the connecting assembly includes an adjusting member 1104, an adjusting screw 1106 and an adjusting nut 1105; one end of the adjusting member 1104 is connected to one end of the trigger rod 1101 located in the limiting cover 1102, the other end of the adjusting member 1104 passes through the limiting cover 1102 and is provided with a threaded hole, one end of the adjusting screw 1106 is threadedly connected to the threaded hole, the other end of the adjusting screw 1106 is connected to one end of the trigger arm gear shaft 111 away from the third stroke incremental rocker 113, and the adjusting nut 1105 is sleeved on the adjusting screw 1106.

[0094] Combination Figure 7 As shown, the length of the adjusting screw 1106 is adjustable and remains unchanged after being locked and fixed. By setting different initial lengths, the corresponding displacement required for the signal trigger device 109 to issue an alarm and trigger the locking contact can be adjusted, and then the action value of the action signal output by the trigger rod 1101 can be adjusted to achieve the purpose of adjusting the alarm and locking contact density action value. Specifically, by adjusting the different lengths of the adjusting screw 1106, the setting of the air pressure value corresponding to the different displacements can be met. The transmission stroke displacement of the transmission part of the equipment is in a one-to-one correspondence with the size of the air pressure value. By adjusting the length of the adjusting screw 1106, the relative displacement between it and the signal switch contact of the signal trigger device 109 can be changed, that is, the preset total deformation amount, thereby changing the air pressure value required to trigger the signal switch contact of the signal trigger device 109, and then achieving the purpose of setting the initial pressure value.

[0095] As the measured air pressure increases or decreases, it is eventually converted into the corresponding displacement of the trigger rod 1101, and moves up and down with the change of air pressure. Under the action of the lever 121 and the stroke increment mechanism, since the stroke displacement of the trigger rod 1101 is in a one-to-one correspondence with the air pressure value, the stroke displacement required by the signal switch contact of the trigger signal generator (109) is amplified, that is, a larger displacement is required for a unit air pressure value change; this is conducive to improving the setting accuracy of the alarm pressure value or the locking pressure value, and also improves the vibration resistance, so that the adverse effect of the stroke displacement caused by environmental vibration on the accuracy is minimized, and the occurrence of false alarms is avoided. At the same time, under the action of the spring 1103, a dynamic balance is achieved between the gas pressure, the signal switch contact of the signal generator (109) and the spring 1103 force, eliminating the influence of the mechanical structure matching clearance on the accuracy, and improving the stability and vibration resistance.

[0096] In this embodiment, if Figure 7 As shown, the signal contact switches of the signal trigger device 109 and the elastic deformation transmission device 110 are both more than two and correspond one to one, so they can be set into any number of switch groups, 1 group, 2 groups, 3 groups or 4 groups according to different needs, and each group of switches sends signals together or individually.

[0097] Please refer to Figure 1 and Figure 6 , Embodiment 3 of the present invention is:

[0098] A sub-control density monitoring device with stroke increments, based on the above-mentioned embodiment 1 or 2, an hour hand display device is located in a mechanical housing 101; a pointer 106 display device includes an end seat 108, a dial 107 and a pointer 106, and the mechanical housing 101 also has a Baden tube 103, a base 102 and a temperature compensation sheet 104; one end of the Baden tube 103 is sealed and connected to the air pipe 123 through the base 102, and the other end of the Baden tube 103 is connected to the temperature compensation sheet 104 through the end seat 108, and the temperature compensation sheet 104 is transmission-connected to the movement 105 of the pointer 106 display device, and the pointer 106 is arranged on the dial 107 through the movement 105; the deformation amount of the temperature compensation sheet 104 can be changed according to the change of the temperature inside the housing.

[0099] The temperature compensation sheet 104 is a temperature-sensitive "U"-shaped element, and the size of the opening and closing of the "U"-shaped opening end changes with the temperature. This characteristic of the temperature compensation sheet 104 is used to reversely correct the change relationship between the pressure and temperature of the measured gas to eliminate the influence of temperature on the pressure, thereby reflecting the change in gas density. The Baden tube 103 is an elastic element, that is, under the pressure of the measured gas, the end of the Baden tube 103 is forced to produce corresponding elastic deformation and displacement, and then the reverse correction of the temperature compensation sheet 104 is used to transfer the corrected displacement to the movement 105, and the movement 105 is transferred to the pointer 106, and the measured gas density value is indicated on the dial 107.

[0100] At the same time, the equipment can also include a clock to record the test time; it has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; when online monitoring finds that the gas pressure has an increasing trend, an abnormal notice can be issued in time; it also has the function of protecting the internal temperature of the electronic component housing to prevent it from working at too low or too high a temperature, so that it works within the allowable temperature range; a heater and / or a radiator (such as a fan) can also be provided, the heater is turned on at low temperature, and the radiator is turned on at high temperature, so as to ensure that electronic components such as pressure sensors and / or integrated circuits can work reliably in low or high temperature environments; it can also have data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on electrical equipment and the density relay itself thereon.

[0101] Please refer to Fig. 9 , Embodiment 4 of the present invention is:

[0102] A separate control type density monitoring method with stroke increment is applied to a separate control type density monitoring device with stroke increment in the first, second or third embodiment, comprising the following steps:

[0103] S1. Install the electric control valve 4 and the density detection mechanism on the air chamber of the device under test 10, start the device and adjust the preset total deformation of the elastic deformation transmission device 110;

[0104] See also Figure 2 and Figure 3 As shown, the gas density relay of this embodiment has a self-checking function, and the working principle of the self-checking is as follows:

[0105] According to the set verification time and / or verification instruction, the gas density value obtained according to the collected pressure value and temperature value, and the corresponding collected contact signal value are analyzed. Under the condition that the density detection mechanism is allowed to be verified, the signal trigger device 109 is directly or indirectly adjusted to the verification state through the main controller 7. Figure 3As shown, in the verification state, the signal trigger device 109 cuts off the control loop of the contact signal of the contact signal acquisition unit 6, that is, the signal trigger device 109 is controlled by the main controller 7 to de-energize the intermediate relay J1 control coil of the signal trigger device 109, and its contacts J11 and J12 are disconnected, so that the contact signal of the density detection mechanism is disconnected from the control loop of the contact signal. At the same time, the contact PJ of the density detection structure is connected to the main controller 7.

[0106] Then, the main controller 7 controls the air pressure regulating device 5, and the temperature and pressure of the air pressure regulating device 5 increase under the action of the heating component 502; then, the main controller 7 controls the electric control valve 4 to close, thereby cutting off the air path between the density detection mechanism and the electrical equipment.

[0107] The main controller 7 controls the heating component 502 of the gas pressure regulating device 5 to stop heating, the temperature drops, the pressure decreases, and the pressure of the heating gas chamber 501 changes. The gas pressure of the density detection mechanism can be adjusted to slowly drop, so that the density detection mechanism generates an alarm and a locking signal contact action. The contact action is transmitted to the main controller 7 through the signal trigger device 109. The main controller 7 obtains the gas density value P20 according to the pressure value P and temperature value T when the alarm and locking signal contacts are actuated, or directly obtains the gas density value P20, detects the alarm and locking contact signal action values ​​of the gas density relay, and completes the verification of the contact signal action value of the gas density relay.

[0108] Next, combine Figure 1 As shown, the main controller 7 drives the heating component 502 of the gas pressure regulating device 5 to heat, so that the gas pressure rises slowly, causing the gas density relay to alarm and reset the lockout signal contacts. The alarm and lockout signal contact resets are transmitted to the main controller 7 through the signal trigger device 109. The main controller 7 obtains the gas density value P20 according to the pressure value P and temperature value T when the contacts are reset, or directly obtains the gas density value P20, detects the alarm and lockout contact signal return values ​​of the density detection mechanism, and completes the verification of the contact signal return values ​​of the density detection mechanism.

[0109] When all the contact signal verification work is completed, the main controller 7 controls the electric control valve 4 to open, so that the density detection mechanism and the gas path of the electrical equipment are connected to each other, and the signal trigger device 109 is adjusted to the working state. At this time, Figure 2 As shown, the signal trigger device 109 is controlled by the main controller 7, so that the intermediate relay J1 control coil of the signal trigger device 109 is energized, and its contacts J11 and J12 are closed, so that the contact signal of the density detection mechanism is connected to the control circuit of the contact signal, and the control circuit of the contact signal of the density detection mechanism resumes normal working state.

[0110] S2, determining whether a trigger signal from the signal trigger device 109 is received, if so, it indicates that the output of the deformation variable output end obtained by adjusting the input of the first deformation variable input end and the second deformation variable input end by the stroke increment mechanism has caused the elastic deformation transmission device 110 to complete the preset total deformation amount, and executing step S3;

[0111] S3. Trigger an alarm, and obtain the real-time gas density value of the measured gas according to the current gas pressure in the mechanism housing 1 and the current internal temperature T of the housing obtained by the sampling control device.

[0112] In this embodiment, a sub-control type self-checking density monitoring device with a stroke increment mechanism can convert the current air pressure and the current temperature inside the shell measured by the pressure sensor and the temperature sensor 3 into a pressure value P20 corresponding to 20°C according to the gas characteristics through the main controller 7, that is, the main controller 7 has the pressure and temperature measurement and software conversion functions. The main controller 7 can measure relative pressure and absolute pressure type gas density relays. The main controller 7 also has an interface that can complete test data storage, and / or test data export, and / or test data can be printed, and / or data communication with the host computer can be carried out, and / or analog and digital information can be input.

[0113] In this embodiment, the main controller 7 uploads the above-mentioned current gas pressure, current shell internal temperature T and / or pressure value P. For example, it is connected to the substation integrated automation online monitoring system through RS-485 and other data communication methods, and is remotely transmitted to the unmanned station central monitoring station, and real-time monitoring is performed at the local and remote central monitoring stations of the substation, thereby realizing online monitoring of SF6 gas density in SF6 electrical equipment.

[0114] In summary, the present invention provides a sub-control density monitoring device and method with stroke increment, wherein an electric control valve and a density detection mechanism are arranged on the gas chamber of the device to be tested, the gas to be tested is connected to the first bellows, and the current air pressure in the sampling mechanism shell of the sampling control device and the current temperature inside the shell are used to sense the change in gas density of the gas to be tested through the first bellows to generate a deformation variable, and then the deformation variable is transmitted to the elastic deformation transmission device through the stroke increment mechanism, causing the elastic deformation transmission device to deform, and the elastic deformation is used to reduce the influence of vibration. At the same time, a deformation compensation device is introduced to correct the deformation variable finally applied to the elastic deformation transmission device by the stroke increment mechanism, and the error generated by the measurement of the gas pressure due to the temperature is fed back to the elastic deformation transmission device. When the signal trigger device is triggered, it indicates that the actual gas density has reached the warning condition corresponding to the preset total deformation amount, and the real-time gas density value of the gas to be tested is obtained according to the current air pressure and the current temperature inside the shell, thereby improving the accuracy of gas density monitoring and the reliability of warning, and ensuring the normal operation of high-voltage electrical equipment.

[0115] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A density monitoring device with a stroke increment, characterized in that: It includes a density detection mechanism and an electric control valve for connecting to a gas chamber where the gas to be measured is located; The density detection mechanism comprises a mechanism housing and a sampling control device, a signal trigger device, a stroke increment mechanism, a first bellows and a deformation compensation device located in the mechanism housing. The signal switch contact of the signal trigger device is provided with an elastic deformation transmission device. The sampling control device is used for sampling the gas pressure value in the mechanism housing and the internal temperature of the housing. One end of the first bellows is connected to the air inlet of the mechanism housing through an air pipe, the air inlet is communicated with the electric control valve, the other end of the first bellows is transmission-connected to the first deformation input end of the stroke increment mechanism, the deformation compensation device is transmission-connected to the second deformation input end of the stroke increment mechanism, and the deformation output end of the stroke increment mechanism is transmission-connected to the elastic deformation transmission device; The sampling control device is electrically connected to the signal trigger device and the electric control valve respectively, and the deformation compensation device can provide a corresponding deformation amount according to the change of the internal temperature of the shell; The stroke increment mechanism is used to adjust the output of the deformation variable output end according to the input of the first deformation variable input end and the second deformation variable input end, and the elastic deformation transmission device is used to trigger the signal triggering device after completing the preset total deformation amount.

2. A density monitoring device with a stroke increment according to claim 1, characterized in that: Also included are a multi-way connector and a gas pressure regulating device; The output end of the air pressure regulating device is communicated with the interior of the mechanism housing through the multi-way connector, and the sampling control device is electrically connected to the air pressure regulating device.

3. The density monitoring device with a stroke increment according to claim 1, characterized in that: The deformation compensation device includes a second bellows; The second bellows is in transmission connection with the second deformation input end of the stroke increment mechanism, and a compensating gas is sealed in the second bellows; The gas pressure of the compensating gas can be changed according to the change of the temperature inside the housing.

4. A density monitoring device with a stroke increment according to claim 3, characterized in that: The stroke increment mechanism includes a limiter assembly, a first transmission gear shaft, a second transmission gear shaft, a lever, a fixed support rod, a trigger arm gear shaft, a limiter, a first stroke increment swing rod, a second stroke increment swing rod and a third stroke increment swing rod; The limiting assembly is arranged in the mechanism housing, and the first bellows and the second bellows are both located in the limiting assembly; One end of the first bellows away from the air pipe is sealed and connected to one end of the first transmission gear shaft, one end of the second bellows is sealed and connected to one end of the first transmission gear shaft, one end of the fixed support rod is connected to the limit assembly, and the other end of the fixed support rod is rotatably connected to a position on the lever corresponding to the midpoint of the lever; One end of the lever is connected to the other end of the first transmission gear shaft through the first stroke incremental swing rod at one side facing the limit assembly, one end of the lever is connected to one end of the third stroke incremental swing rod at one side away from the limit assembly, and the other end of the lever is connected to the other end of the second transmission gear shaft through the second stroke incremental swing rod at one side facing the limit assembly; The limiter is arranged in the mechanism housing, the trigger arm gear shaft is movably arranged on the limiter, and the other end of the third stroke increment rocker is transmission-connected to the elastic deformation transmission device through the trigger arm gear shaft.

5. The density monitoring device with a stroke increment according to claim 4, characterized in that: The elastic deformation transmission device comprises a limit cover, a trigger rod, a spring and a connecting assembly; The limit cover is arranged in the mechanism housing, one end of the connecting component located in the limit cover is connected to one end of the trigger rod located in the limit cover, and the other end of the trigger rod passes through the limit cover and is arranged opposite to the signal switch contact of the signal trigger device; The spring is sleeved on the trigger rod, and the two ends of the spring are respectively connected with the inner wall of the limit cover and the connecting component. The other end of the connecting component passes through the limit cover and is connected to one end of the trigger arm gear shaft away from the third stroke incremental rocker arm. The length of the connecting component is adjustable.

6. A density monitoring device with a stroke increment according to claim 5, characterized in that: The connecting assembly comprises an adjusting member, an adjusting screw and an adjusting nut; One end of the adjusting member is connected to one end of the trigger rod located in the limit cover, the other end of the adjusting member passes through the limit cover and is provided with a threaded hole, one end of the adjusting screw is threadedly connected to the threaded hole, the other end of the adjusting screw is connected to one end of the trigger arm gear shaft away from the third stroke incremental rocker, and the adjusting nut is sleeved on the adjusting screw.

7. The density monitoring device with a stroke increment according to claim 1, characterized in that: It also includes a pointer display device, a Baden tube, a base and a temperature compensation sheet; The base is arranged in the mechanism housing, one end of the Baden tube is sealed and connected to the air pipe through the base, and the other end of the Baden tube is transmission-connected to the movement of the pointer display device through the temperature compensation sheet; The deformation amount of the temperature compensation sheet can be changed according to the change of the internal temperature of the housing.

8. The density monitoring device with a stroke increment according to claim 7, characterized in that: The pointer display device comprises an end seat, a dial and a pointer; The scale plate is arranged in the mechanism housing, the Baden tube is connected to the temperature compensation sheet through the end seat, and the pointer is arranged on the scale plate through the movement.

9. The density monitoring device with a stroke increment according to claim 2, characterized in that: The sampling control device includes a main controller, an air pressure sensor and a temperature sensor; The air pressure sensor, the main controller and the temperature sensor are all arranged in the mechanism housing; The main controller is electrically connected to the air pressure sensor, the temperature sensor, the signal triggering device, the electric control valve and the air pressure regulating device respectively.

10. A method for density monitoring with a stroke increment, applied to a density monitoring device with a stroke increment as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. Install the electric control valve and density detection mechanism on the air chamber of the device under test, start the device and adjust the preset total deformation of the elastic deformation transmission device; S2, determining whether a trigger signal from a signal trigger device is received, if so, it indicates that the output of the deformation variable output end obtained by adjusting the input of the first deformation variable input end and the second deformation variable input end by the stroke increment mechanism has caused the elastic deformation transmission device to complete a preset total deformation amount, and executing step S3; S3. Trigger an alarm, and obtain the real-time gas density value of the measured gas according to the current air pressure in the mechanism shell and the current internal temperature of the shell obtained by the sampling control device.

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