Differential pressure type wind speed transmitter

Abstract

The invention belongs to the technical field of wind speed transmitters, and particularly relates to a differential pressure type wind speed transmitter which comprises a transmitter main body, two pressure measuring pipes are symmetrically arranged at the lower end of the transmitter main body, air guide pipes are arranged outside the pressure measuring pipes in a sealing and sleeving mode, temperature measuring valves are arranged outside the air guide pipes, and the temperature measuring valves are communicated with the pressure measuring pipes. The pipe wall of the pressure measuring pipe is fixedly sleeved with a plurality of sealing rubber rings, each sealing rubber ring is of a hollow structure, a compensation gas film is arranged in the middle of each sealing rubber ring, and the pressure measuring device further comprises a compensation gas filling mechanism, a maintenance prompting mechanism and a synchronous gas supply mechanism. The differential pressure type wind speed transmitter has a temperature compensation function, so that the measurement result of the differential pressure type wind speed transmitter is more accurate, the sealing connection part of the pressure measuring pipe and the wind guide pipe can be automatically adjusted based on the gas temperature, the problem of inaccurate pressure difference measurement caused by gas leakage is avoided, and the pressure difference can be accurately measured when sealing compensation is performed between the pressure measuring pipe and the wind guide pipe. And redundant air is used for cooling the wind speed transmitter, so that the wind speed transmitter is assisted to work better.

Description

Technical Field

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

[0002] The differential pressure anemometer is an instrument used to measure wind speed. Its working principle is based on the relationship between the differential pressure and wind speed generated when the fluid passes through a pipe or air duct. The differential pressure transmitter calculates the flow rate or flow by measuring the static pressure difference on both sides of the pipe. The flow of the fluid will cause different static pressures on both sides of the pipe. The differential pressure transmitter measures this pressure difference and then calculates the flow rate or flow based on the physical properties of the fluid and the geometric parameters of the pipe.

[0003] The temperature can vary greatly in different seasons. For example, the ambient temperature in winter and summer may differ by tens of degrees Celsius. If the environment in which the gas to be detected is located has heat exchange with the outside world, then changes in ambient temperature will cause changes in the temperature of the gas to be detected. When the gas temperature changes with the seasons, the physical properties of the gas, such as density and viscosity, will change accordingly, thereby affecting the measurement accuracy of the wind speed transmitter based on the pressure difference 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 gas, R is the ideal gas constant, and T is the gas temperature), when the pressure and the amount of substance remain unchanged, the volume of the gas is proportional to the temperature. The density formula is ρ=m / V (where ρ is the density and m is the gas mass). When the mass remains unchanged, the volume is inversely proportional to the density. Therefore, when the temperature rises, the gas volume increases and the density decreases; when the temperature decreases, the gas volume decreases and the density increases. For differential pressure gas transmitters, the measurement principle is based on the Bernoulli 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 gas flow rate and density. Assume that there are two measuring points A and B in a horizontal pipe. According to the Bernoulli equation: P A +1 / 2ρV 2 A =P B +1 / 2ρV 2 B Where P A and P B are the pressures at points A and B, 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

[0004] The object of the present invention is to provide a differential pressure wind speed transmitter in view of the above problems.

[0005] 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: 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; 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.

[0006] 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.

[0007] In the above-mentioned differential pressure wind speed transmitter, 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.

[0008] The cam is arranged on the upper end of the air supply pipe, and one end of the air supply pipe is connected with the air filter housing, and the other end of the air supply pipe is connected with the air filter housing, and the air filter housing ...

[0009] In the above-mentioned differential pressure wind speed transmitter, 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 slide rods arranged side by side, the plurality of limit slide 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 slide rod, the side of the sliding plate away from the push-back spring 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 slide 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.

[0010] In the above-mentioned differential pressure wind speed transmitter, the auxiliary heat dissipation mechanism includes a plurality of heat dissipation fins fixedly mounted on the rear side of the transmitter body, a buffer tube is fixedly mounted on the lower end of the rear side of the transmitter body, the upper end of the buffer tube is fixedly connected to a plurality of heat dissipation heads located between two adjacent heat dissipation fins, and the lower end of the buffer tube is connected to the pressurization control mechanism.

[0011] In the above-mentioned differential pressure wind speed transmitter, the pressurization control mechanism includes a pressure shell fixedly connected to the ventilation pipe, a plurality of holes are symmetrically opened at the bottom end of the pressure shell, and guide rods are movably inserted in the corresponding holes, and the upper ends of the plurality of guide rods are fixedly connected to the same pressure piston, and the upper inner wall of the pressure shell is symmetrically fixedly connected to two blocks that abut against the upper end of the pressure piston, and the lower outer sides of the plurality of guide rods are movably sleeved with the same pressure plate, and the upper end of the pressure plate and the lower end of the pressure piston are fixedly provided with a plurality of pressure springs sleeved outside the guide rods, and the lower end of the pressure plate is fixedly provided with a force-bearing permanent magnet plate, and the bottom of the inner wall of the pressure shell is fixedly provided with a force-bearing electromagnetic plate arranged opposite to the force-bearing permanent magnet plate, and the upper side wall of the pressure shell is fixedly connected to a pressure relief pipe, and the upper end of the pressure relief pipe is fixedly connected to a buffer pipe.

[0012] In the above-mentioned differential pressure wind speed transmitter, a limit slider is fixedly mounted on the outer wall of the trigger plate, and a limit sliding groove matching and slidingly connected with the limit slider is opened on the inner wall of the prompt shell.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the transmitter body, temperature measuring valve and temperature sensing control mechanism, the temperature of the gas to be detected can be monitored, and the temperature signal can be converted into a resistance signal. The measurement result of the differential pressure wind speed transmitter can be corrected based on the resistance signal. When the gas temperature is high, the measurement result of the pressure difference is compensated and enlarged, and when the gas temperature is low, the measurement result of the pressure difference is reduced. This avoids the problem that when the temperature increases and the gas density decreases, the pressure difference between the two points will decrease, and when the temperature decreases and the gas density increases, the pressure difference will increase, thereby affecting the measurement result of the gas wind speed. The transmitter has a temperature compensation function, which makes the measurement result of the differential pressure wind speed transmitter more accurate.

[0014] 2. By setting up the pressure measuring tube, air duct, sealing rubber ring, compensating air film, compensating air filling mechanism, synchronous air supply mechanism and pressurization control mechanism, the sealing connection between the pressure measuring tube and the air duct can be automatically adjusted based on the gas temperature to ensure that the pressure measuring tube and the air duct can always be stably sealed and connected together to avoid gas leakage causing inaccurate pressure difference measurement. The sealing compensation strength can be automatically adjusted based on the specific size of the gas temperature. The higher the temperature, the greater the sealing compensation strength. This is because when the temperature rises, the materials of the air duct and the pressure measuring tube will undergo thermal expansion. The different thermal expansion coefficients of the air duct and the pressure measuring tube will cause stress in the connection part, thereby affecting the sealing performance. The higher the temperature, the different thermal expansion coefficients will cause the air duct and the pressure measuring tube to deform more.

[0015] 3. Through the maintenance reminder mechanism set up, the frequency of maintenance of the wind speed transmitter can be automatically calculated based on the different effects of different gas temperatures on the wind speed transmitter when the wind speed transmitter is working. When the gas temperature is high, the high temperature will cause the performance of the electronic components inside the transmitter to decline. The semiconductor devices in the integrated circuit will have problems such as increased leakage and reduced carrier mobility at high temperatures, thereby affecting the accuracy and stability of the transmitter. The life of electronic components will be shortened in a high temperature environment for a long time. Passive components such as capacitors and resistors will also be affected by high temperatures, and the resistance value of resistors may drift. These will affect the performance of the transmitter. The higher the temperature, the higher the frequency of reminders for maintenance of the wind speed transmitter, avoiding the problem that high temperature has too much impact on the wind speed transmitter, thereby affecting the measurement accuracy.

[0016] 4. By setting up the auxiliary heat dissipation mechanism, when sealing compensation is performed between the pressure measuring tube and the air duct, the excess air can be used to dissipate the heat of the wind speed transmitter, thereby assisting the wind speed transmitter to work better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the structure of the three-dimensional cross-section of the installation of the pressure measuring tube and the air guide tube of the present invention; Figure 4 It is a schematic cross-sectional view of the compensating gas filling mechanism of the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the maintenance prompt mechanism of the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the synchronous air supply mechanism of the present invention; Figure 7 It is a schematic cross-sectional view of the temperature sensing and regulating mechanism of the present invention; Figure 8 is a schematic cross-sectional structural diagram of the pressurization control mechanism of the present invention; Fig. 9 yes Figure 6 Schematic diagram of the three-dimensional structure of the middle cam.

[0018] In the figure: 1 transmitter body, 2 compensation gas filling mechanism, 21 annular gas filling square tube, 22 gas filling chamber, 23 ventilation pipe, 24 first one-way valve, 3 maintenance reminder mechanism, 31 reminder shell, 32 transmission screw, 33 servo motor, 34 trigger plate, 35 trigger switch, 36 alarm, 4 synchronous gas supply mechanism, 41 gas supply shell, 42 speed increasing gear box, 43 gas supply piston, 44 lifting rod, 45 lifting plate, 46 reset spring, 47 cam, 48 gas supply pipe, 49 gas filling pipe, 410 second one-way valve, 5 temperature sensing control mechanism, 51 control shell, 52 limit Position slide bar, 53 sliding plate, 54 push-back spring, 55 regulating permanent magnet plate, 56 regulating electromagnetic plate, 57 regulating resistor rod, 58 regulating conductive contact, 6 auxiliary heat dissipation mechanism, 61 heat dissipation fins, 62 buffer tube, 63 heat dissipation head, 7 pressurization control mechanism, 71 pressure shell, 72 guide rod, 73 pressure piston, 74 block, 75 pressurization plate, 76 pressurization spring, 77 force permanent magnet plate, 78 force electromagnetic plate, 79 pressure relief pipe, 8 pressure measuring pipe, 9 air guide pipe, 10 temperature measuring valve, 11 sealing rubber ring, 12 compensation air film, 13 PLC controller. Implementation

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figure 1-Figure 9 As shown, a differential pressure wind speed transmitter comprises a transmitter body 1, two pressure measuring tubes 8 are symmetrically arranged at the lower end of the transmitter body 1, an air guide tube 9 is arranged outside the pressure measuring tube 8, a temperature measuring valve 10 is arranged outside the air guide tube 9, a plurality of sealing rubber rings 11 are arranged on the pipe wall fixing sleeve of the pressure measuring tube 8, the sealing rubber ring 11 is a hollow structure, and a compensating air film 12 is arranged in the middle position, and further comprises: The compensating gas filling mechanism 2 is fixedly installed at the lower end of the transmitter body 1 and is connected to the compensating gas membrane 12. The compensating gas filling mechanism 2 includes two annular gas filling square tubes 21 symmetrically fixedly installed at the lower end of the transmitter body 1. The upper end of the air duct 9 abuts against the lower end of the annular gas filling square tube 21. The inner side of the pressure measuring tube 8 is provided with a gas filling cavity 22 connected to the annular gas filling square tube 21 and the compensating gas membrane 12. The two annular gas filling square tubes 21 are fixedly connected with the same ventilation tube 23. Two first one-way valves 24 are symmetrically installed on the ventilation tube 23. Two groups of pressurization control mechanisms 7 are symmetrically fixedly connected on the ventilation tube 23. Based on the different gas temperatures and the different thermal expansion coefficients of the pressure measuring tube 8 and the air duct 9, which affect the pressure measuring tube 8 and the air duct 9, active sealing compensation can be performed to avoid leakage that affects the accuracy of wind speed measurement.

[0021] 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.

[0022] 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.

[0023] The temperature sensing and regulating mechanism 5 is fixedly mounted on the outer wall of the transmitter body 1, and comprises a regulating shell 51, the inner wall of the regulating shell 51 is fixedly connected with a plurality of limit slide bars 52 arranged side by side, a same sliding plate 53 is slidably sleeved on the outer side of the plurality of limit slide bars 52, a plurality of push-back springs 54 sleeved on the outer side of the limit slide bars 52 are fixedly connected to the lower end of the sliding plate 53 and the bottom of the inner wall of the regulating shell 51, a regulating permanent magnetic plate 55 is fixedly connected to the side of the sliding plate 53 away from the push-back spring 54, a regulating electromagnetic plate 56 arranged opposite to the regulating permanent magnetic plate 55 is fixedly mounted on the inner wall of the regulating shell 51, a regulating resistor rod 57 arranged parallel to the limit slide bar 52 is fixedly mounted on the inner wall of the regulating shell 51, a regulating conductive contact piece 58 in electrical contact with the regulating resistor rod 57 is fixedly mounted on one side of the sliding plate 53, the gas temperature can be monitored in real time, and the temperature information can be fed back into regulating information, so that various mechanisms can be automatically regulated based on temperature changes.

[0024] The auxiliary heat dissipation mechanism 6 is installed on the rear side of the transmitter body 1 and is connected to the compensating gas filling mechanism 2. The auxiliary heat dissipation mechanism 6 includes a plurality of heat dissipation fins 61 fixedly installed on the rear side of the transmitter body 1. A buffer tube 62 is fixedly installed on the lower end of the rear side of the transmitter body 1. The upper end of the buffer tube 62 is fixedly connected to a plurality of heat dissipation heads 63 located between two adjacent heat dissipation fins 61. The lower end of the buffer tube 62 is connected to the pressurization control mechanism 7, which can use excess air to dissipate heat from the transmitter body 1 and assist the transmitter body 1 to work better.

[0025] The pressurization control mechanism 7 includes a pressure shell 71 fixedly connected to the ventilation pipe 23, a plurality of insertion holes are symmetrically opened at the bottom end of the pressure shell 71, and guide rods 72 are movably inserted in the corresponding insertion holes, the upper ends of the plurality of guide rods 72 are fixedly connected to the same pressure piston 73, the upper end inner wall of the pressure shell 71 is symmetrically fixedly connected to two blocks 74 abutting against the upper end of the pressure piston 73, the lower ends of the plurality of guide rods 72 are movably sleeved with the same pressure plate 75, the upper end of the pressure plate 75 and the lower end of the pressure piston 73 are fixedly provided with a plurality of pressure springs 76 sleeved on the outside of the guide rods 72, the lower end of the pressure plate 75 is fixedly provided with a force-bearing permanent magnet plate 77, the inner wall bottom of the pressure shell 71 is fixedly provided with a force-bearing electromagnetic plate 78 arranged opposite to the force-bearing permanent magnet plate 77, the upper end side wall of the pressure shell 71 is fixedly connected to a pressure relief pipe 79, and the upper end of the pressure relief pipe 79 is fixedly connected to the buffer pipe 62.

[0026] The PLC controller 13 is fixedly mounted on the outer wall of the transmitter body 1 and is electrically connected to the compensating gas filling mechanism 2, the maintenance prompting mechanism 3, the synchronous gas supply mechanism 4, the temperature sensing and regulating mechanism 5 and the auxiliary heat dissipation mechanism 6 respectively.

[0027] The operating principle of the present invention is described as follows: the pressure measuring tube 8 and the air duct 9 are sealed together, and the sealing rubber ring 11 makes the pressure measuring tube 8 and the air duct 9 have good sealing connection. The air duct 9 transports the gas in the pipeline to be measured into the pressure measuring tube 8. The transmitter body 1 senses the pressure difference of the gas through the pressure measuring tubes 8 on both sides, converts it into an electrical signal based on the differential pressure value, and measures the wind speed; When the gas flows in the air duct 9, the temperature measuring valve 10 can measure the gas temperature and feed back 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 size of the temperature signal. The higher the temperature, the greater the power supply current of the regulating electromagnetic plate 56, so that 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 sliding rod 52 to overcome the elastic force of the push-back spring 54, so that the regulating conductive contact 58 slides a greater distance on the regulating resistor rod 57, thereby making the access resistance of the regulating resistor rod 57 smaller. The resistance signal feedback of the regulating resistor rod 57 should determine the change of The correction value of the measurement result of the transmitter body 1 is as follows: the higher the temperature, the smaller the resistance signal of the regulating resistor rod 57 is, and the more the measurement result of the transmitter body 1 is expanded and compensated. On the contrary, the lower the temperature, the larger the resistance signal of the regulating resistor rod 57 is, and the pressure difference measurement result is reduced. When the gas temperature is high, the pressure difference measurement result is compensated and expanded, and when the gas temperature is low, the pressure difference measurement result is reduced. This avoids the problem that when the temperature increases and the gas density decreases, the pressure difference between the two points will decrease, and when the temperature decreases and the gas density increases, the pressure difference will increase, thereby affecting the measurement result of the gas wind speed. The transmitter has a temperature compensation function, so that the measurement result of the differential pressure wind speed transmitter is more accurate. When the transmitter body 1 is working, the PLC controller 13 synchronously controls the servo motor 33 to move, and the servo motor 33 drives the transmission screw 32 to rotate. The threaded sleeve of the transmission screw 32 and the trigger plate 34 allows the trigger plate 34 to move in the prompt shell 31 until the trigger plate 34 presses on the trigger switch 35. This indicates that the transmitter body 1 should be repaired to avoid long-term use causing errors in the performance of the transmitter body 1, thereby affecting the measurement accuracy. The regulating conductive contact 58 and the regulating resistor rod 57 are connected in series to the power supply circuit of the servo motor 33. When the gas temperature is higher, the access resistance of the regulating resistor rod 57 is smaller, and the power supply current of the servo motor 33 is larger. The servo motor 33 is a DC motor, which increases the speed of the servo motor 33, thereby shortening the interval time of the trigger plate 34 pressing on the trigger switch 35, and increasing the frequency of the maintenance prompt for the transmitter body 1. This avoids the problem that high temperature will have a greater impact on the performance of the transmitter body 1. Untimely maintenance will affect the measurement accuracy of the transmitter body 1. When the transmission screw 32 rotates, it drives the input end of the speed increasing gear box 42 to rotate, and the cam 47 is driven to rotate through the speed increasing gear box 42. When the protruding part of the cam 47 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 to push the air supply piston 43 downward in the air supply shell 41, and then the air in the air supply shell 41 is transported to the ventilation pipe 23 through the air supply pipe 48. The ventilation pipe 23 further transports the air to the annular air-filling square tube 21, and then transports it to the compensation air film 12 through the air-filling cavity 22, so that the compensation air film 12 bulges, making the pressure measuring tube 8 and the air guide The connection between the tubes 9 has better sealing performance. The continuous rotation of the cam 47 causes the air in the air supply shell 41 to be continuously transported to the compensation air film 12. When the air pressure in the compensation air film 12 reaches the threshold, the air pressure in the vent pipe 23 increases, which causes the pressure piston 73 to overcome the elastic force of the pressure spring 76 and move backward, so that the pressure relief pipe 79 is opened, and the excess air is transported to the buffer pipe 62 through the pressure relief pipe 79, and a high-speed airflow is ejected through the heat dissipation head 63 to dissipate heat to the heat dissipation fins 61, which can provide further auxiliary heat dissipation for the transmitter body 1 and improve the use stability of the transmitter body 1. The regulating conductive contact 58 and the regulating resistor rod 57 are also connected in series to the power supply circuit of the force-adding electromagnetic plate 78. When the gas temperature is high and the access resistance of the regulating resistor rod 57 is small, the power supply current of the force-adding electromagnetic plate 78 increases, thereby generating a magnetic force that is the same as or greater than that of the force-bearing permanent magnet plate 77, thereby pushing the pressure plate 75 toward the pressure piston 73, compressing the pressure spring 76, so that the pressure spring 76 generates a greater squeezing force on the pressure piston 73, and then generating a greater compensation air pressure in the compensation air film 12 before the pressure piston 73 is pushed. Open, so that the pressure relief pipe 79 is open for air conduction, to avoid that the higher the temperature, the greater the thermal deformation of the pressure measuring tube 8 and the air duct 9, which is easy to cause a larger displacement variable, and then the problem of insufficient sealing, and when the temperature rises, the servo motor 33 drives the transmission screw 32 to rotate faster, so that the speed of the cam 47 is accelerated, and more air in the air supply shell 41 is delivered per unit time, so that the heat dissipation head 63 can spray more heat dissipation air per unit time, assisting the transmitter body 1 to better dissipate heat and have better adaptability.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential pressure wind speed transmitter, comprising a transmitter body (1), wherein two pressure measuring tubes (8) are symmetrically arranged at the lower end of the transmitter body (1), an air guide tube (9) is arranged outside the sealing sleeve of the pressure measuring tube (8), a temperature measuring valve (10) is arranged outside the air guide tube (9), a tube wall fixing sleeve of the pressure measuring tube (8) is provided with a plurality of sealing rubber rings (11), the sealing rubber ring (11) is a hollow structure, and a compensating air film (12) is arranged in the middle, characterized in that: Also includes: A compensating gas filling mechanism (2) is fixedly mounted on the lower end of the transmitter body (1) and is connected to the compensating gas film (12); a maintenance prompting mechanism (3) is fixedly mounted on the outer wall of the transmitter body (1); a synchronous gas supply mechanism (4) is fixedly mounted on the outer wall of the transmitter body (1) and is transmission-connected to the maintenance prompting mechanism (3), and the synchronous gas supply mechanism (4) is also connected to the compensating gas filling mechanism (2); a temperature sensing and regulating mechanism (5) is fixedly mounted on the outer wall of the transmitter body (1); an auxiliary heat dissipation mechanism (6) is mounted on the rear side of the transmitter body (1) and is connected to the compensating gas filling mechanism (2); and a PLC controller (13) is fixedly mounted on the outer wall of the transmitter body (1) and is electrically connected to the compensating gas filling mechanism (2), the maintenance prompting mechanism (3), the synchronous gas supply mechanism (4), the temperature sensing and regulating mechanism (5) and the auxiliary heat dissipation mechanism (6).

2. A differential pressure wind speed transmitter according to claim 1, characterized in that: The compensating air filling mechanism (2) comprises two annular air filling square tubes (21) symmetrically fixedly mounted at the lower end of the transmitter body (1); the upper end of the air guide tube (9) abuts against the lower end of the annular air filling square tube (21); the inner side of the pressure measuring tube (8) is provided with an air filling cavity (22) connected to the annular air filling square tube (21) and the compensating air membrane (12); the two annular air filling square tubes (21) are fixedly connected to the same ventilation tube (23); two first one-way valves (24) are symmetrically mounted on the ventilation tube (23); and two sets of pressurization control mechanisms (7) are symmetrically fixedly connected to the ventilation tube (23).

3. A differential pressure wind speed transmitter according to claim 2, characterized in that: The maintenance prompt mechanism (3) comprises a prompt housing (31) fixedly mounted outside the transmitter body (1); the inner wall of the prompt housing (31) is rotatably connected to a transmission screw (32); the outer wall of the prompt housing (31) is fixedly mounted with a servo motor (33) for driving the transmission screw (32) to rotate; the rod wall of the transmission screw (32) is threadedly sleeved with a trigger plate (34); a trigger switch (35) arranged opposite to the trigger plate (34) is fixedly mounted on one side of the inner wall of the prompt housing (31); and a warning device (36) is fixedly mounted on the outer wall of the prompt housing (31).

4. A differential pressure wind speed transmitter according to claim 3, characterized in that: The synchronous air supply mechanism (4) comprises an air supply shell (41) and a speed increasing gear box (42) fixedly mounted outside the transmitter body (1); an air supply piston (43) is provided in a sealing sleeve inside the air supply shell (41); a plurality of lifting rods (44) are fixedly connected to the upper end of the air supply piston (43); the upper ends of the plurality of lifting rods (44) penetrate the upper end of the air supply shell (41) and are fixedly connected to the same lifting plate (45); a plurality of return springs (46) sleeved outside the lifting rods (44) are fixedly mounted at the lower end of the lifting plate (45) and the upper end of the air supply shell (41). The output end of the speed increasing gearbox (42) is fixedly connected to a cam (47), and 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 gearbox (42). The lower end of the air supply shell (41) is also fixedly connected to an air supply pipe (48) and an air supply pipe (49). The air supply pipe (48) and the air supply pipe (49) are both provided with a second one-way valve (410). The lower end of the air supply pipe (48) is fixedly connected to the pipe wall of the ventilation pipe (23).

5. The differential pressure wind speed transmitter according to claim 1, characterized in that: The temperature sensing control mechanism (5) comprises a control shell (51), the inner wall of the control shell (51) is fixedly connected to a plurality of limit slide bars (52) arranged in parallel, the plurality of limit slide bars (52) are slidably sleeved with a same sliding plate (53) outside, the lower end of the sliding plate (53) and the bottom of the inner wall of the control shell (51) are fixedly connected to a plurality of push-back springs (54) sleeved outside the limit slide bars (52), the side of the sliding plate (53) away from the push-back springs (54) is fixedly connected to a control permanent magnetic plate (55), the inner wall of the control shell (51) is fixedly provided with a control electromagnetic plate (56) arranged opposite to the control permanent magnetic plate (55), the inner wall of the control shell (51) is fixedly provided with a control resistor rod (57) arranged parallel to the limit slide bar (52), and one side of the sliding plate (53) is fixedly provided with a control conductive contact piece (58) in electrical contact with the control resistor rod (57).

6. A differential pressure wind speed transmitter according to claim 2, characterized in that: The auxiliary heat dissipation mechanism (6) comprises a plurality of heat dissipation fins (61) fixedly mounted on the rear side of the transmitter body (1); a buffer tube (62) is fixedly mounted on the lower end of the rear side of the transmitter body (1); the upper end of the buffer tube (62) is fixedly connected to a plurality of heat dissipation heads (63) located between two adjacent heat dissipation fins (61); and the lower end of the buffer tube (62) is connected to the pressurization control mechanism (7).

7. A differential pressure wind speed transmitter according to claim 6, characterized in that: The pressurization control mechanism (7) comprises a pressure shell (71) fixedly connected to the ventilation pipe (23), a plurality of plug holes are symmetrically opened at the bottom end of the pressure shell (71), and a guide rod (72) is movably inserted into the corresponding plug holes, and the upper ends of the plurality of guide rods (72) are fixedly connected to the same pressure piston (73), and the inner wall of the upper end of the pressure shell (71) is symmetrically fixedly connected to two stoppers (74) that abut against the upper end of the pressure piston (73), and 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 outside the guide rod (72) are fixedly mounted on the upper end of the pressure plate (75) and the lower end of the pressure piston (73), a force-bearing permanent magnet plate (77) is fixedly mounted on the lower end of the pressure plate (75), a force-bearing electromagnetic plate (78) arranged opposite to the force-bearing permanent magnet plate (77) is fixedly mounted on the bottom of the inner wall of the pressure shell (71), and a pressure relief pipe (79) is fixedly connected to the upper side wall of the pressure shell (71), and the upper end of the pressure relief pipe (79) is fixedly connected to the buffer pipe (62).

8. A differential pressure wind speed transmitter according to claim 3, characterized in that: A limit sliding block is fixedly mounted on the outer wall of the trigger plate (34), and a limit sliding groove matching and slidingly connected with the limit sliding block is provided on the inner wall of the prompt shell (31).

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