A differential pressure type wind speed transmitter

Abstract

The present invention belongs to the technical field of wind speed transmitters, and particularly relates to a differential pressure type wind speed transmitter, which includes a transmitter main body. Two pressure measuring tubes are symmetrically installed at the lower end of the transmitter main body. An air guide pipe is hermetically sleeved outside the pressure measuring tube, and a temperature measuring valve is installed outside the air guide pipe. A plurality of sealing rubber rings are fixedly sleeved on the pipe wall of the pressure measuring tube. The sealing rubber ring is of a hollow structure, and a compensation air film is installed at the middle position. It also includes: a compensation air adding mechanism, a maintenance prompt mechanism, and a synchronous air supply mechanism. The present invention has a temperature compensation function, making the measurement result of the differential pressure type wind speed transmitter more accurate. It can automatically adjust the sealed connection between the pressure measuring tube and the air guide pipe based on the gas temperature, avoiding the problem that inaccurate differential pressure measurement may be caused by gas leakage. When performing seal compensation between the pressure measuring tube and the air guide pipe, the redundant air can be used to dissipate heat from the wind speed transmitter, assisting the wind speed transmitter to work better.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind speed transmitters, and in particular relates to a differential pressure type wind speed transmitter. Background Art

[0002] A differential pressure type wind speed transmitter is an instrument for measuring wind speed. Its working principle is based on the relationship between the differential pressure generated when a fluid passes through a pipeline or air duct and the wind speed for measurement. The differential pressure transmitter calculates the flow velocity or flow rate by measuring the static pressure difference on both sides of the pipeline through which the fluid passes. The flow of the fluid will cause different static pressure differences on both sides of the pipeline. The differential pressure transmitter measures this pressure difference and then calculates the flow velocity or flow rate based on the physical properties of the fluid and the geometric parameters of the pipeline.

[0003] In different seasons, there are significant differences in temperature. For example, the ambient temperature difference between winter and summer can reach dozens of degrees Celsius. If there is heat exchange between the environment where the gas to be detected is located and the outside world, then the change in ambient temperature will cause the temperature of the gas to be detected to change. When the gas temperature changes with the seasons, since the physical properties such as the density and viscosity of the gas will change accordingly, it will affect the measurement accuracy of the wind speed transmitter based on the differential pressure principle. According to the ideal gas state equation: PV = nRT (where P is the gas pressure, V is the gas volume, n is the amount of substance of the gas, R is the ideal gas constant, and T is the gas temperature), at constant pressure and amount of substance, the volume of the gas is proportional to the temperature. And the density formula is ρ = m / V (where ρ is the density and m is the gas mass). When the mass is constant, the volume is inversely proportional to the density. Therefore, when the temperature rises, the gas volume increases and the density decreases; when the temperature drops, the gas volume decreases and the density increases. For a differential pressure type gas transmitter, its measurement principle is based on Bernoulli's equation, that is, the sum of the kinetic energy and pressure energy of the fluid is a constant. During the gas flow process, the pressure difference at different positions is related to factors such as the flow velocity and density of the gas;

[0004] Assume that in a horizontal pipeline, there are two measurement points A and B. According to Bernoulli's equation:

[0005] P A +1 / 2ρV 2 A =P B +1 / 2ρV 2 B

[0006] where P A and P B are the pressures at points A and B respectively, ρ is the gas density, V A and V BThey are the flow velocities at points A and B respectively. When the temperature increases and the gas density decreases, if other conditions remain unchanged, according to the above equation, the pressure difference between the two points will decrease; conversely, when the temperature decreases and the gas density increases, the pressure difference will increase, which will have a greater impact on the measurement accuracy of the differential pressure wind speed transmitter. Summary of the invention

[0007] The object of the present invention is to provide a differential pressure wind speed transmitter in view of the above problems.

[0008] To achieve the above object, the present invention adopts the following technical scheme: a differential pressure wind speed transmitter, including a transmitter body, two pressure measuring tubes are symmetrically arranged at the lower end of the transmitter body, an air duct is arranged outside the sealing sleeve of the pressure measuring tube, a temperature measuring valve is arranged outside the air duct, a plurality of sealing rubber rings are arranged on the pipe wall fixing sleeve of the pressure measuring tube, the sealing rubber ring is a hollow structure, and a compensating air film is arranged in the middle position, and also includes:

[0009] A compensating gas filling mechanism is fixedly mounted at the lower end of the transmitter body and is connected to the compensating gas film;

[0010] A maintenance reminder mechanism is fixedly mounted on the outer wall of the transmitter body;

[0011] A synchronous air supply mechanism is fixedly mounted on the outer wall of the transmitter body and is transmission-connected to the maintenance prompt mechanism. The synchronous air supply mechanism is also connected to the compensation air filling mechanism.

[0012] A temperature sensing and regulating mechanism is fixedly mounted on the outer wall of the transmitter body;

[0013] An auxiliary heat dissipation mechanism is installed on the rear side of the transmitter body and is connected to the compensation gas filling mechanism;

[0014] The PLC controller is fixedly mounted on the outer wall of the transmitter body and is electrically connected to the compensating gas filling mechanism, the maintenance prompting mechanism, the synchronous gas supply mechanism, the temperature sensing and regulating mechanism and the auxiliary heat dissipation mechanism respectively.

[0015] In the above-mentioned differential pressure wind speed transmitter, the compensating air-filling mechanism includes two annular air-filling square tubes symmetrically fixedly installed at the lower end of the transmitter body, the upper end of the air guide tube abuts against the lower end of the annular air-filling square tube, and the inner side of the pressure measuring tube is provided with an air-filling cavity connected to the annular air-filling square tube and the compensating air membrane. The two annular air-filling square tubes are fixedly connected with the same ventilation pipe, two first one-way valves are symmetrically installed on the ventilation pipe, and two sets of pressurization control mechanisms are symmetrically fixedly connected on the ventilation pipe.

[0016] In the above-mentioned differential pressure type wind speed transmitter, the maintenance prompt mechanism includes a prompt shell fixedly installed outside the transmitter main body. A transmission screw is rotatably connected to the inner wall of the prompt shell. A servo motor for driving the transmission screw to rotate self is fixedly installed on the outer wall of the prompt shell. A trigger plate is threadedly sleeved on the rod wall of the transmission screw. A trigger switch opposite to the trigger plate is fixedly installed on one side of the inner wall of the prompt shell. A warning device is fixedly installed on the outer wall of the prompt shell.

[0017] In the above-mentioned differential pressure type wind speed transmitter, the synchronous air supply mechanism includes an air supply shell and a speed increasing gear box fixedly installed outside the transmitter main body. An air supply piston is hermetically sleeved in the air supply shell. The upper end of the air supply piston is fixedly connected with a plurality of lifting rods. The upper ends of the plurality of lifting rods penetrate through the upper end of the air supply shell and are fixedly connected with the same lifting plate. A plurality of return springs sleeved outside the lifting rods are fixedly installed between the lower end of the lifting plate and the upper end of the air supply shell. The output end of the speed increasing gear box is fixedly connected with a cam. The cam is arranged at the upper end of the lifting plate. One end of the transmission screw penetrates out of the prompt shell and is fixedly connected with the input end of the speed increasing gear box. The lower end of the air supply shell is also fixedly communicated with an air supply pipe and a supplementary air pipe. Second one-way valves are installed on both the air supply pipe and the supplementary air pipe. The lower end of the air supply pipe is fixedly communicated with the pipe wall of the ventilation pipe.

[0018] In the above-mentioned differential pressure type wind speed transmitter, the temperature sensing and regulating mechanism includes a regulating shell. A plurality of limiting sliding rods arranged side by side are fixedly connected to the inner wall of the regulating shell. The same sliding plate is slidably sleeved outside the plurality of limiting sliding rods. A plurality of return springs sleeved outside the limiting sliding rods are fixedly connected between the lower end of the sliding plate and the bottom of the inner wall of the regulating shell. A regulating permanent magnet plate is fixedly connected to the side of the sliding plate away from the return spring. A regulating electromagnetic plate opposite to the regulating permanent magnet plate is fixedly installed on the inner wall of the regulating shell. A regulating resistance rod parallel to the limiting sliding rods is fixedly installed on the inner wall of the regulating shell. A regulating conductive contact piece in electrical contact with the regulating resistance rod is fixedly installed on one side of the sliding plate.

[0019] In the above-mentioned differential pressure type wind speed transmitter, the auxiliary heat dissipation mechanism includes a plurality of heat dissipation fins fixedly installed on the rear side of the transmitter main body. A buffer pipe is fixedly installed at the lower end of the rear side of the transmitter main body. The upper end of the buffer pipe is fixedly communicated with a plurality of heat dissipation air heads located between adjacent two heat dissipation fins. The lower end of the buffer pipe is communicated with the pressure boosting control mechanism.

[0020] In the above-mentioned differential pressure type wind speed transmitter, the pressurization control mechanism includes a pressure shell fixedly communicated with the ventilation pipe. A plurality of jacks are symmetrically opened at the bottom end of the pressure shell, and guide rods are movably inserted into the corresponding jacks. The upper ends of the plurality of guide rods are fixedly connected to the same pressure piston. Two stoppers abutting against the upper end of the pressure piston are symmetrically and fixedly connected to the inner wall of the upper end of the pressure shell. The lower outer sides of the plurality of guide rods are movably sleeved with the same pressurization plate. A plurality of pressurization springs sleeved on the guide rods are fixedly arranged between the upper end of the pressurization plate and the lower end of the pressure piston. A force-receiving permanent magnet plate is fixedly arranged at the lower end of the pressurization plate. A force-applying electromagnetic plate opposite to the force-receiving permanent magnet plate is fixedly arranged at the bottom of the inner wall of the pressure shell. The upper side wall of the pressure shell is fixedly communicated with a pressure relief pipe, and the upper end of the pressure relief pipe is fixedly communicated with the buffer pipe.

[0021] In the above-mentioned differential pressure type wind speed transmitter, a limit slider is fixedly arranged on the outer wall of the trigger plate, and a limit sliding groove matched with the limit slider is opened on the inner wall of the prompt shell.

[0022] Compared with the existing technology, the beneficial effects of the present invention are as follows:

[0023] 1. By setting the transmitter main body, the temperature measuring valve, and the temperature sensing and regulating mechanism, the temperature of the gas to be detected can be monitored, and the temperature signal can be converted into a resistance signal. Based on the resistance signal, the measurement result of the differential pressure type wind speed transmitter is corrected. When the gas temperature is on the high side, the measurement result of the compensated and enlarged pressure difference is obtained, and when the gas temperature is on the low side, the measurement result of the pressure difference is reduced, avoiding the problem that when the temperature rises and the gas density decreases, the pressure difference between two points will decrease, and conversely, when the temperature drops and the gas density increases, the pressure difference will increase, thereby affecting the measurement result of the gas wind speed. It has a temperature compensation function, making the measurement result of the differential pressure type wind speed transmitter more accurate.

[0024] 2. By setting the pressure measuring pipe, the air guide pipe, the sealing rubber ring, the compensation air film, the compensation air adding mechanism, the synchronous air supply mechanism, and the pressurization control mechanism, the sealed connection between the pressure measuring pipe and the air guide pipe can be automatically adjusted based on the gas temperature, ensuring that the pressure measuring pipe and the air guide pipe can always be stably and sealedly connected together, avoiding the problem that gas leakage will cause inaccurate differential pressure measurement, and the sealed compensation intensity can be automatically adjusted based on the specific magnitude of the gas temperature. The higher the temperature, the greater the sealed compensation intensity, because when the temperature rises, the materials of the air guide pipe and the pressure measuring pipe will undergo thermal expansion, and the different thermal expansion coefficients of the air guide pipe and the pressure measuring pipe will cause stress at the connection part, thereby affecting the sealing performance. The higher the temperature, the greater the deformation amount of the air guide pipe and the pressure measuring pipe due to the different thermal expansion coefficients.

[0025] 3. Through the provided maintenance reminder mechanism, when the wind speed transmitter is working, since the influence of the gas temperature on the wind speed transmitter varies, it can automatically calculate the maintenance frequency required for the wind speed transmitter. When the gas temperature is high, the high temperature will cause the performance of the electronic components inside the transmitter to decline. Semiconductor devices in the integrated circuit will have problems such as increased leakage current and reduced carrier mobility at high temperatures, thereby affecting the accuracy and stability of the transmitter. If it is in a high-temperature environment for a long time, the lifespan of the electronic components will be shortened, and passive components such as capacitors and resistors will also be affected by the high temperature. The resistance value of the resistor may drift, all of which will affect the performance of the transmitter. Furthermore, the higher the temperature, the higher the reminder frequency for maintaining the wind speed transmitter, avoiding excessive influence of high temperature on the wind speed transmitter and thus affecting the measurement accuracy.

[0026] 4. Through the provided auxiliary heat dissipation mechanism, when sealing compensation is carried out between the pressure measuring pipe and the air guide pipe, the excess air can be used to dissipate heat from the wind speed transmitter, assisting the wind speed transmitter to work better. Brief Description of the Drawings

[0027] Figure 1 is the front view structural schematic diagram of the present invention;

[0028] Figure 2 is the rear view structural schematic diagram of the present invention;

[0029] Figure 3 is the three-dimensional sectional structural schematic diagram of the installation of the pressure measuring pipe and the air guide pipe of the present invention;

[0030] Figure 4 is the sectional structural schematic diagram of the compensation gas adding mechanism of the present invention;

[0031] Figure 5 is the sectional structural schematic diagram of the maintenance reminder mechanism of the present invention;

[0032] Figure 6 is the sectional structural schematic diagram of the synchronous gas supply mechanism of the present invention;

[0033] Figure 7 is the sectional structural schematic diagram of the temperature sensing and regulation mechanism of the present invention;

[0034] Figure 8 is the sectional structural schematic diagram of the pressure boosting control mechanism of the present invention;

[0035] Figure 9 is Figure 6 the three-dimensional structural schematic diagram of the cam in

[0036] In the figure: 1 transmitter main body, 2 compensation gas filling mechanism, 21 annular gas filling square pipe, 22 gas filling cavity, 23 ventilation pipe, 24 first one-way valve, 3 maintenance prompt mechanism, 31 prompt shell, 32 transmission screw rod, 33 servo motor, 34 trigger plate, 35 trigger switch, 36 warning device, 4 synchronous gas supply mechanism, 41 gas supply shell, 42 speed increasing gearbox, 43 gas supply piston, 44 lifting rod, 45 lifting plate, 46 return spring, 47 cam, 48 gas supply pipe, 49 supplementary gas pipe, 410 second one-way valve, 5 temperature sensing and regulation mechanism, 51 regulation shell, 52 limit sliding rod, 53 sliding plate, 54 push-back spring, 55 regulation permanent magnet plate, 56 regulation electromagnetic plate, 57 regulation resistance rod, 58 regulation conductive connecting piece, 6 auxiliary heat dissipation mechanism, 61 heat dissipation fins, 62 buffer pipe, 63 heat dissipation air head, 7 pressure control mechanism, 71 pressure shell, 72 guide rod, 73 pressure piston, 74 stop block, 75 pressure plate, 76 pressure spring, 77 force-bearing permanent magnet plate, 78 force-applying electromagnetic plate, 79 pressure relief pipe, 8 pressure measuring pipe, 9 air duct, 10 temperature measuring valve, 11 sealing rubber ring, 12 compensation air film, 13 PLC controller. Embodiment

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0038] As Figures 1-9 shown, a differential pressure type wind speed transmitter includes a transmitter main body 1. Two pressure measuring pipes 8 are symmetrically arranged at the lower end of the transmitter main body 1. An air duct 9 is hermetically sleeved outside the pressure measuring pipe 8. A temperature measuring valve 10 is arranged outside the air duct 9. A plurality of sealing rubber rings 11 are fixedly sleeved on the pipe wall of the pressure measuring pipe 8. The sealing rubber ring 11 is of a hollow structure, and a compensation air film 12 is arranged at the middle position. It further includes:

[0039] A compensation gas filling mechanism 2 is fixedly arranged at the lower end of the transmitter main body 1 and is communicated with the compensation air film 12. The compensation gas filling mechanism 2 includes two annular gas filling square pipes 21 symmetrically and fixedly arranged at the lower end of the transmitter main body 1. The upper end of the air duct 9 abuts against the lower end of the annular gas filling square pipe 21. An air filling cavity 22 communicated with the annular gas filling square pipe 21 and the compensation air film 12 is opened inside the pressure measuring pipe 8. The same ventilation pipe 23 is fixedly communicated between the two annular gas filling square pipes 21. Two first one-way valves 24 are symmetrically arranged on the ventilation pipe 23. Two groups of pressure control mechanisms 7 are symmetrically and fixedly communicated with the ventilation pipe 23. It can actively perform sealing compensation based on the difference in gas temperature and the difference in the thermal expansion coefficients of the pressure measuring pipe 8 and the air duct 9, so as to avoid the problem of air leakage affecting the accuracy of wind speed measurement.

[0040] The maintenance prompt mechanism 3 is fixedly mounted on the outer wall of the transmitter body 1. The maintenance prompt mechanism 3 includes a prompt shell 31 fixedly mounted outside the transmitter body 1. The inner wall of the prompt shell 31 is rotatably connected with a transmission screw 32. A servo motor 33 for driving the transmission screw 32 to rotate is fixedly mounted on the outer wall of the prompt shell 31. A trigger plate 34 is threadedly sleeved on the rod wall of the transmission screw 32. A trigger switch 35 arranged opposite to the trigger plate 34 is fixedly mounted on one side of the inner wall of the prompt shell 31. An alarm 36 is fixedly mounted on the outer wall of the prompt shell 31. A limit slider is fixedly mounted on the outer wall of the trigger plate 34. A limit slide groove matching the limit slider is provided on the inner wall of the prompt shell 31. The use of the transmitter body 1 can be calculated and judged, and the staff can be reminded in time to calibrate and repair the transmitter body 1 to avoid the problem that the performance change of the transmitter body 1 affects the measurement accuracy.

[0041] The synchronous air supply mechanism 4 is fixedly mounted on the outer wall of the transmitter body 1 and is transmission-connected with the maintenance prompt mechanism 3. The synchronous air supply mechanism 4 is also connected with the compensation air filling mechanism 2. The synchronous air supply mechanism 4 includes an air supply shell 41 and a speed increasing gear box 42 fixedly mounted outside the transmitter body 1. The air supply shell 41 has an air supply piston 43 in a sealing sleeve. The upper end of the air supply piston 43 is fixedly connected with a plurality of lifting rods 44. The upper ends of the plurality of lifting rods 44 penetrate the upper end of the air supply shell 41 and are fixedly connected with the same lifting plate 45. The lower end of the lifting plate 45 and the upper end of the air supply shell 41 are fixedly provided with a plurality of sleeves. A return spring 46 outside the lifting rod 44 and a cam 47 are fixedly connected to the output end of the speed increasing gear box 42. The cam 47 is arranged at the upper end of the lifting plate 45. One end of the transmission screw 32 extends through the prompt shell 31 and is fixedly connected to the input end of the speed increasing gear box 42. The lower end of the air supply shell 41 is also fixedly connected with an air supply pipe 48 and an air supply pipe 49. A second one-way valve 410 is installed on the air supply pipe 48 and the air supply pipe 49. The lower end of the air supply pipe 48 is fixedly connected to the pipe wall of the ventilation pipe 23, and the power of the maintenance prompt mechanism 3 can be used to provide air supply for the sealing compensation work, which saves energy and is easy to operate.

[0042] The temperature-sensing control mechanism 5 is fixedly installed on the outer wall of the transmitter main body 1. The temperature-sensing control mechanism 5 includes a control housing 51. A plurality of limiting slide rods 52 arranged side by side are fixedly connected to the inner wall of the control housing 51. The outer sides of the plurality of limiting slide rods 52 are slidably sleeved with the same sliding plate 53. A plurality of return springs 54 sleeved on the limiting slide rods 52 are fixedly connected between the lower end of the sliding plate 53 and the bottom of the inner wall of the control housing 51. A control permanent magnet plate 55 is fixedly connected to one side of the sliding plate 53 away from the return spring 54. A control electromagnetic plate 56 is fixedly installed on the inner wall of the control housing 51 opposite to the control permanent magnet plate 55. A control resistance rod 57 parallel to the limiting slide rods 52 is fixedly installed on the inner wall of the control housing 51. A control conductive contact piece 58 in electrical contact with the control resistance rod 57 is fixedly installed on one side of the sliding plate 53. It can monitor the gas temperature in real time and feedback the temperature information into control information, enabling various mechanisms to achieve automatic control based on temperature changes.

[0043] The auxiliary heat dissipation mechanism 6 is installed at the rear side of the transmitter main body 1 and is connected to the compensation gas adding mechanism 2 in a communicating manner. The auxiliary heat dissipation mechanism 6 includes a plurality of heat dissipation fins 61 fixedly installed at the rear side of the transmitter main body 1. A buffer tube 62 is fixedly installed at the lower end of the rear side of the transmitter main body 1. The upper end of the buffer tube 62 is fixedly communicated with a plurality of heat dissipation air heads 63 located between adjacent two heat dissipation fins 61. The lower end of the buffer tube 62 is connected to the pressure control mechanism 7 in a communicating manner. It can use the excess air for heat dissipation of the transmitter main body 1 to assist the transmitter main body 1 to work better.

[0044] The pressure control mechanism 7 includes a pressure housing 71 fixedly communicated with the ventilation pipe 23. A plurality of jacks are symmetrically opened at the bottom end of the pressure housing 71, and corresponding guide rods 72 are movably inserted into the jacks. The upper ends of the plurality of guide rods 72 are fixedly connected to the same pressure piston 73. Two stoppers 74 abutting against the upper end of the pressure piston 73 are symmetrically fixedly connected to the upper inner wall of the pressure housing 71. The outer sides of the lower ends of the plurality of guide rods 72 are movably sleeved with the same pressure plate 75. A plurality of pressure springs 76 sleeved on the guide rods 72 are fixedly installed between the upper end of the pressure plate 75 and the lower end of the pressure piston 73. A force-receiving permanent magnet plate 77 is fixedly installed at the lower end of the pressure plate 75. A force-applying electromagnetic plate 78 opposite to the force-receiving permanent magnet plate 77 is fixedly installed at the bottom of the inner wall of the pressure housing 71. The upper side wall of the pressure housing 71 is fixedly communicated with a pressure relief pipe 79, and the upper end of the pressure relief pipe 79 is fixedly communicated with the buffer tube 62.

[0045] The PLC controller 13 is fixedly installed on the outer wall of the transmitter main body 1 and is electrically connected to the compensation gas adding mechanism 2, the maintenance prompt mechanism 3, the synchronous gas supply mechanism 4, the temperature-sensing control mechanism 5, and the auxiliary heat dissipation mechanism 6 respectively.

[0046] The operating principle of the present invention is described as follows: The piezometric tube 8 and the air duct 9 are sleeved together in a sealed manner. Through the action of the sealing rubber ring 11, the sealing connection between the piezometric tube 8 and the air duct 9 is good. The air duct 9 conveys the gas in the pipeline to be measured into the piezometric tube 8. The transmitter main body 1 senses the pressure difference of the gas through the two piezometric tubes 8 on both sides, and converts it into an electrical signal based on the differential pressure value to measure the wind speed;

[0047] When the gas flows in the air duct 9, the temperature measuring valve 10 can measure the gas temperature and feedback the temperature signal to the PLC controller 13. The PLC controller 13 controls the power supply device to supply power to the regulating electromagnetic plate 56 based on the magnitude of the temperature signal. The higher the temperature, the greater the supply current of the regulating electromagnetic plate 56. As a result, the regulating electromagnetic plate 56 is energized to generate the same and greater magnetism as the regulating permanent magnet plate 55, thereby driving the sliding plate 53 to slide a greater distance along the limiting slide bar 52 against the elastic force of the return spring 54, causing the regulating conductive contact piece 58 to slide a greater distance on the regulating resistance rod 57, and further making the resistance value of the regulating resistance rod 57 smaller. The resistance value signal feedback of the regulating resistance rod 57 should determine the magnitude of the correction value for the measurement result of the transmitter main body 1. When the resistance value signal of the regulating resistance rod 57 is smaller at a higher temperature, the measurement result of the transmitter main body 1 is compensated and enlarged more. On the contrary, when the resistance value signal of the regulating resistance rod 57 is larger at a lower temperature, the measured pressure difference result is reduced. When the gas temperature is on the high side, the measurement result of the compensated and enlarged pressure difference is obtained, while when the gas temperature is on the low side, the measurement result of the pressure difference is reduced, avoiding the problem that when the temperature rises and the gas density decreases, the pressure difference between two points will decrease, and conversely, when the temperature drops and the gas density increases, the pressure difference will increase, thereby affecting the measurement result of the gas wind speed. It has a temperature compensation function, making the measurement result of the differential pressure type wind speed transmitter more accurate;

[0048] When the transmitter main body 1 is working, the PLC controller 13 synchronously controls the operation of the servo motor 33. The servo motor 33 drives the transmission screw 32 to rotate. Through the threaded socket connection between the transmission screw 32 and the trigger plate 34, the trigger plate 34 moves within the prompt housing 31 until the trigger plate 34 presses on the trigger switch 35, indicating that the transmitter main body 1 should be repaired. This can avoid the problem that the performance of the transmitter main body 1 generates errors due to long-term use, thereby affecting the measurement accuracy. Moreover, the regulating conductive tab 58 and the regulating resistance rod 57 are connected in series in the power supply circuit of the servo motor 33. When the gas temperature is higher, the resistance value of the regulating resistance rod 57 connected is smaller, the supply current of the servo motor 33 is larger, and since the servo motor 33 is a DC motor, the rotation speed of the servo motor 33 increases, thereby shortening the interval time when the trigger plate 34 presses on the trigger switch 35 and increasing the frequency of the repair prompt for the transmitter main body 1, avoiding the problem that high temperature will have a greater impact on the performance of the transmitter main body 1 and that untimely repair will affect the measurement accuracy of the transmitter main body 1;

[0049] When the transmission screw 32 rotates, it drives the input end of the speed increasing gearbox 42 to rotate. Through the speed increasing gearbox 42, the cam 47 is driven to rotate. When the protruding part of the cam 47 squeezes and pushes on the lifting plate 45, the lifting plate 45 cooperates with the lifting rod 44 to overcome the elastic force of the return spring 46 and push the air supply piston 43 to move downward within the air supply housing 41. Then, the air in the air supply housing 41 is conveyed through the air supply pipe 48 into the ventilation pipe 23. The ventilation pipe 23 further conveys the air into the annular air adding square pipe 21 and through the air adding cavity 22 into the compensation air film 12, causing the compensation air film 12 to bulge, making the connection seal between the pressure measuring pipe 8 and the air guiding pipe 9 better. The continuous rotation of the cam 47 causes the air in the air supply housing 41 to be continuously conveyed into the compensation air film 12. When the air pressure in the compensation air film 12 reaches the threshold value, the air pressure in the ventilation pipe 23 increases, which will cause the pressure piston 73 to move backward against the elastic force of the pressurizing spring 76, opening the pressure relief pipe 79. Then, the excess air is conveyed through the pressure relief pipe 79 into the buffer pipe 62 and ejected as a high-speed air flow through the heat dissipation air head 63 to dissipate heat from the heat dissipation fins 61, which can provide further auxiliary heat dissipation for the transmitter main body 1 and improve the use stability of the transmitter main body 1;

[0050] Moreover, the regulating conductive tab 58 and the regulating resistance rod 57 are also connected in series in the power supply circuit of the boosting electromagnetic plate 78. When the gas temperature is high and the access resistance value of the regulating resistance rod 57 is small, the supply current of the boosting electromagnetic plate 78 increases, thereby generating a magnetic force that is the same as and greater than that of the stressed permanent magnet plate 77. Then, it pushes the pressure plate 75 towards the pressure piston 73, compressing the pressure spring 76, so that the pressure spring 76 generates a greater extrusion force on the pressure piston 73. Then, after a greater compensation air pressure is generated in the compensation air film 12, the pressure piston 73 will be pushed open, enabling the air release pipe 79 to conduct air, avoiding the problem that the higher the temperature, the greater the thermal deformation of the pressure measuring pipe 8 and the air guide pipe 9, which is likely to cause a greater displacement variable and thus insufficient sealing. Moreover, when the temperature rises, the speed of the servo motor 33 driving the transmission screw 32 increases, causing the rotation speed of the cam 47 to increase. More air in the air supply housing 41 is sent in per unit time, so that the heat dissipation air head 63 can eject more heat dissipation air per unit time, assisting the transmitter main body 1 to dissipate heat better and having better adaptability.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A differential pressure type wind speed transmitter, comprising a transmitter main body, two pressure measuring tubes are symmetrically arranged at the lower end of the transmitter main body, a wind guide pipe is hermetically sleeved outside the pressure measuring tube, a temperature measuring valve is arranged outside the wind guide pipe, a plurality of sealing rubber rings are fixedly sleeved on the pipe wall of the pressure measuring tube, the sealing rubber ring is of a hollow structure, and a compensation air film is arranged at the middle position, characterized in that, Also includes: A compensating gas filling mechanism is fixedly mounted at the lower end of the transmitter body and is connected to the compensating gas film; A maintenance reminder mechanism is fixedly mounted on the outer wall of the transmitter body; A synchronous air supply mechanism is fixedly mounted on the outer wall of the transmitter body and is transmission-connected to the maintenance prompt mechanism. The synchronous air supply mechanism is also connected to the compensation air filling mechanism. A temperature sensing and regulating mechanism is fixedly mounted on the outer wall of the transmitter body; An auxiliary heat dissipation mechanism is installed on the rear side of the transmitter body and is connected to the compensation gas filling mechanism; A PLC controller is fixedly mounted on the outer wall of the transmitter body and is electrically connected to the compensation gas filling mechanism, the maintenance prompt mechanism, the synchronous gas supply mechanism, the temperature sensing and regulating mechanism and the auxiliary heat dissipation mechanism respectively; The compensation gas filling mechanism includes two annular gas filling square tubes symmetrically fixedly installed at the lower end of the transmitter body, the upper end of the air guide tube abuts against the lower end of the annular gas filling square tube, the inner side of the pressure measuring tube is provided with a gas filling cavity connected to the annular gas filling square tube and the compensation gas membrane, the two annular gas filling square tubes are fixedly connected with the same ventilation pipe, two first one-way valves are symmetrically installed on the ventilation pipe, and two sets of pressurization control mechanisms are symmetrically fixedly connected on the ventilation pipe; The temperature sensing and control mechanism includes a control shell, the inner wall of the control shell is fixedly connected to a plurality of limit sliding rods arranged side by side, the plurality of limit sliding rods are slidably sleeved with the same sliding plate, the lower end of the sliding plate and the bottom of the inner wall of the control shell are fixedly connected to a plurality of push-back springs sleeved outside the limit sliding rods, the side of the sliding plate away from the push-back springs is fixedly connected to a control permanent magnetic plate, the inner wall of the control shell is fixedly provided with a control electromagnetic plate arranged opposite to the control permanent magnetic plate, the inner wall of the control shell is fixedly provided with a control resistor rod arranged parallel to the limit sliding rod, and one side of the sliding plate is fixedly provided with a control conductive contact piece electrically in contact with the control resistor rod.

2. The differential pressure type wind speed transmitter according to claim 1, wherein, The maintenance reminder mechanism includes a reminder shell fixedly mounted outside the transmitter body, the inner wall of the reminder shell is rotatably connected to a transmission screw, the outer wall of the reminder shell is fixedly mounted with a servo motor for driving the transmission screw to rotate, the rod wall of the transmission screw is threadedly sleeved with a trigger plate, a trigger switch arranged opposite to the trigger plate is fixedly mounted on one side of the inner wall of the reminder shell, and a warning device is fixedly mounted on the outer wall of the reminder shell.

3. The differential pressure type wind speed transmitter according to claim 2, characterized in that, The synchronous gas supply mechanism includes a gas supply shell and a speed increasing gear box fixedly installed outside the transmitter main body. A gas supply piston is sealingly sleeved in the gas supply shell. The upper end of the gas supply piston is fixedly connected with a plurality of lifting rods. The upper ends of the plurality of lifting rods penetrate through the upper end of the gas supply shell and are fixedly connected with the same lifting plate. A plurality of return springs sleeved outside the lifting rods are fixedly installed between the lower end of the lifting plate and the upper end of the gas supply shell. The output end of the speed increasing gear box is fixedly connected with a cam. The cam is arranged on the upper end of the lifting plate. One end of the transmission screw rod penetrates out of the prompt shell and is fixedly connected with the input end of the speed increasing gear box. The lower end of the gas supply shell is also fixedly communicated with a gas supply pipe and a supplementary gas pipe. Second one-way valves are installed on both the gas supply pipe and the supplementary gas pipe. The lower end of the gas supply pipe is fixedly communicated with the pipe wall of the ventilation pipe.

4. The differential pressure type wind speed transmitter according to claim 1, characterized in that, The auxiliary heat dissipation mechanism includes a plurality of heat dissipation fins fixedly installed on the rear side of the transmitter main body. A buffer pipe is fixedly installed at the lower end of the rear side of the transmitter main body. The upper end of the buffer pipe is fixedly communicated with a plurality of heat dissipation air heads located between two adjacent heat dissipation fins. The lower end of the buffer pipe is communicated with the pressure control mechanism.

5. The differential pressure type wind speed transmitter according to claim 4, characterized in that, The pressure control mechanism includes a pressure shell fixedly communicated with the ventilation pipe. A plurality of jacks are symmetrically opened at the bottom end of the pressure shell, and guide rods are movably inserted into the corresponding jacks. The upper ends of the plurality of guide rods are fixedly connected with the same pressure piston. Two stoppers abutting against the upper end of the pressure piston are symmetrically and fixedly connected to the inner wall of the upper end of the pressure shell. The same pressure plate is movably sleeved outside the lower ends of the plurality of guide rods. A plurality of pressure springs sleeved outside the guide rods are fixedly installed between the upper end of the pressure plate and the lower end of the pressure piston. A force receiving permanent magnet plate is fixedly installed at the lower end of the pressure plate. A force adding electromagnetic plate opposite to the force receiving permanent magnet plate is fixedly installed at the bottom of the inner wall of the pressure shell. A pressure relief pipe is fixedly communicated with the side wall of the upper end of the pressure shell. The upper end of the pressure relief pipe is fixedly communicated with the buffer pipe.

6. The differential pressure type wind speed transmitter according to claim 2, characterized in that, A limit slider is fixedly installed on the outer wall of the trigger plate. A limit sliding groove matched with the limit slider is opened on the inner wall of the prompt shell.

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