A piezoresistive pressure transmitter

Abstract

The present invention discloses a piezoresistive pressure transmitter, belonging to the technical field of pressure transmitters, including a pressure transmitter main body. An installation pipe is fixedly installed on the outer circumferential wall surface of the pressure transmitter main body, and a measuring diaphragm is fixedly sleeved on the inner circumferential wall surface of the installation pipe. By the mutual cooperation of the pressure transmitter main body, the guiding pipe, the temperature measurer, the measuring diaphragm, the second valve, the first valve, the cooling pipe, the heat dissipation cylinder, the heat dissipation pipe and the heat dissipation fins, the temperature of the hot water can be reduced. By the mutual cooperation of the guiding pipe, the cooling pipe, the second valve, the first valve, the cross plate, the movable column, the limiting block, the limiting hole, the support box, the connecting rod, the baffle plate, the support block, the movable rod, the first electric push rod, the water inlet pipe and the push plate, the cleaner can be mixed with water and the guiding pipe and the cooling pipe can be flushed reversely, so as to accurately measure the water pressure, which is convenient for the staff to use the pressure transmitter main body in the pipeline.

Description

Technical Field

[0001] The present invention relates to the field of pressure transmitters, and specifically to a piezoresistive pressure transmitter. Background Art

[0002] A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by a pressure-measuring element sensor into a standard electric signal. A piezoresistive pressure transmitter is a type of pressure transmitter. Inside a piezoresistive pressure transmitter, there is a piezoresistive element. When an external pressure acts on the piezoresistive element, its resistance value will change accordingly. This change is based on the piezoresistive effect, that is, when a material is subjected to an external force, its resistance value will change. High precision: The piezoresistive pressure transmitter can accurately measure the change in pressure and has a high measurement accuracy. Stable and reliable: Since it works based on the physical properties of the material, it has high stability and reliability. Widely used: It has a wide range of applications in industrial automation, petroleum, chemical industry, machinery, aviation and other fields.

[0003] After retrieval, it is found that there are problems with the existing piezoresistive pressure transmitters. The piezoresistive pressure transmitter measures pressure by measuring the deformation of a diaphragm after being subjected to pressure and cooperating with a corresponding sensor. When using a piezoresistive pressure transmitter to measure the pressure of hot water, due to the characteristic that the resistance value of the diaphragm on the piezoresistive pressure transmitter changes with temperature, when the hot water pressure acts on the single-crystal silicon diaphragm, the diaphragm will generate strain. This strain will cause the resistance value of the strain resistors directly diffused on the diaphragm to change, and the temperature of the hot water will also cause the change in the resistance value of the strain resistors on the diaphragm to interfere with the measurement of the piezoresistive pressure transmitter, resulting in inaccurate measurement results of the piezoresistive pressure transmitter for the hot water pressure and affecting the measurement accuracy. At the same time, after long-term use of the guide tube, the scale of the hot water may adhere to the inner wall of the guide tube. The scale causes the inner diameter of the inner wall of the guide tube to change. And for hot water at the same flow rate, the smaller the inner diameter of the pipe, the greater the pressure. The change in the inner diameter of the guide tube will inevitably cause the measurement results of the piezoresistive pressure transmitter for the hot water pressure to change, and will also reduce the measurement accuracy, affecting the use of the piezoresistive pressure transmitter by the staff. Therefore, based on the above retrieval and combined with the existing technology, the present invention provides a piezoresistive pressure transmitter to solve the problems existing in the background art. Summary of the Invention

[0004] The purpose of the present invention is to provide a piezoresistive pressure transmitter, which has the advantages of high precision and little influence by temperature, and solves the problem that the change in the resistance value of the strain resistors on the diaphragm caused by the temperature of the hot water also interferes with the measurement of the piezoresistive pressure transmitter, resulting in inaccurate measurement results of the piezoresistive pressure transmitter for the hot water pressure.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A piezoresistive pressure transmitter, comprising a pressure transmitter main body, an installation pipe is fixedly installed on the outer circumferential wall surface of the pressure transmitter main body, a measuring diaphragm is fixedly sleeved on the inner circumferential wall surface of the installation pipe, a connection cover is threadedly connected to the outer circumferential wall surface of the installation pipe, a guiding pipe for connecting with a pipeline is fixedly installed on the bottom surface of the connection cover, a sealing ring is fixedly installed on the inner circumferential wall surface of the connection cover, a temperature measuring device for measuring the temperature of hot water is fixedly installed on the outer circumferential wall surface of the guiding pipe, an accurate measuring mechanism for improving the measuring accuracy of the pressure transmitter main body is arranged on the outer circumferential wall surface of the guiding pipe, and a shock-absorbing mechanism for damping the pressure transmitter main body is arranged at one end of the pressure transmitter main body.

[0007] Further, the accurate measuring mechanism includes a cooling pipe, the cooling pipe is fixedly installed on the outer circumferential wall surface of the guiding pipe, the lower half of the cooling pipe bends downward, a heat dissipation cylinder is fixedly sleeved on the outer circumferential wall surface of the cooling pipe, two first valves are fixedly sleeved on the inner circumferential wall surface of the guiding pipe, cooling oil is filled in the interior of the heat dissipation cylinder, two heat dissipation pipes for allowing the cooling oil to flow are fixedly installed on the outer circumferential wall surface of the heat dissipation cylinder, a plurality of heat dissipation fins are fixedly sleeved on the outer circumferential wall surface of the heat dissipation pipe, a connecting pipe is fixedly installed on the outer circumferential wall surface of the guiding pipe, a support box is fixedly installed at one end of the connecting pipe, a water inlet pipe for water inlet is fixedly installed on the outer circumferential wall surface of the support box, a baffle is slidably connected in the interior of the support box, limiting holes are opened on both sides of the support box, limiting blocks are slidably connected in the limiting holes, a placing block is fixedly installed on one side of the baffle, a connecting rod is rotatably connected to one side of the limiting block, the other end of the connecting rod is rotatably connected to the placing block, movable rods are rotatably connected to both sides in the interior of the support box, a support block is fixedly installed on one side of the baffle, one end of the movable rod is rotatably connected to one side of the support block, a movable column is fixedly installed on the bottom surface of the limiting block, a cross plate is fixedly installed at the bottom end of the movable column, a second electric push rod for driving the movable column to move is installed on the bottom surface of the support box, a push plate for pushing the cleaning agent to move forward is arranged on one side in the interior of the support box, and a first electric push rod for driving the push plate to move is installed on one side of the support box.

[0008] Further, a storage box for storing the cleaning agent is fixedly installed on the top surface of the support box, a blanking valve for discharging the cleaning agent is fixedly installed on the bottom surface of the storage box, and an electronic scale for weighing the cleaning agent is fixedly installed on the bottom surface of the support box.

[0009] Further, limiting grooves for the sliding of the baffle are formed on both inner sides of the support box, limiting posts are fixedly installed on both sides of the baffle, and the limiting posts are slidably connected to the limiting grooves.

[0010] Further, a sewage discharge valve is fixedly installed on the outer circumferential wall surface of the guiding pipe, a sewage discharge pipe for sewage discharge is fixedly sleeved on the inner circumferential wall surface of the sewage discharge valve, and the sewage discharge valve is electrically connected to the PLC controller.

[0011] Further, the shock absorption mechanism includes a support pipe fixedly installed at one end of the pressure transmitter main body. A connecting plate is slidably connected inside the support pipe. Two positioning rods are slidably connected to the inner bottom surface of the support pipe. The positioning rods penetrate through the connecting plate. An active ring is elastically connected to the outer circumferential wall surface of the positioning rod through an elastic member. Two clamping columns are fixedly installed on the top surface of the connecting plate. The clamping columns are movably clamped with the support pipe. A rubber shock absorption pipe is fixedly installed on the bottom surface of the guiding pipe. A top plate is fixedly installed on one side of the connecting plate. Two fixing holes are formed on one side of the top plate.

[0012] Further, two sliding grooves for the sliding of the positioning rods are formed on the bottom surface of the support pipe. A sliding block is fixedly installed on the bottom surface of the positioning rod. The sliding block is slidably connected to the sliding groove.

[0013] Further, a support ring is fixedly sleeved on the outer circumferential wall surface of the cooling pipe. A connecting column is fixedly installed on the outer circumferential wall surface of the support ring. One side of the connecting column is fixedly connected to the outer circumferential wall surface of the guiding pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. Through the mutual cooperation of the pressure transmitter main body, the guiding pipe, the temperature measuring device, the measuring diaphragm, the second valve, the first valve, the cooling pipe, the heat dissipation cylinder, the heat dissipation pipe and the heat dissipation fins, the temperature can be reduced when the temperature of the hot water exceeds the threshold value, avoiding the inaccuracy of the measuring diaphragm caused by the temperature of the hot water exceeding the threshold value of the measuring diaphragm. Through the mutual cooperation of the guiding pipe, the cooling pipe, the second valve, the first valve, the cross plate, the movable column, the limiting block, the limiting hole, the support box, the connecting rod, the baffle, the support block, the movable rod, the first electric push rod, the water inlet pipe and the push plate, the cleaning agent can be mixed with water and the guiding pipe and the cooling pipe can be reversely flushed to clean the scale therein. During this process, the staff can not only reduce the influence of the hot water temperature on the hot water pressure measurement but also clean the scale on the inner walls of the guiding pipe and the cooling pipe, improving the accuracy of the measurement result, achieving the accurate measurement of the water pressure, and facilitating the staff to use the pressure transmitter main body in the pipeline.

[0016] 2. Through the provided storage box, the staff stores the cleaning agent inside the support box. By the mutual cooperation of the provided blanking valve, electronic scale, storage box, and support box, the cleaning agent can enter the support box quantitatively, thus enabling the quantitative dispensing of the cleaning agent.

[0017] 3. Through the provided rubber shock-absorbing tube, the staff connects the rubber shock-absorbing tube to the pipeline. By the mutual cooperation of the provided push column, connecting plate, positioning rod, movable ring, spring, clamping column, support tube, clamping hole, movable hole, and top plate, the pressure transmitter main body can be fixed. When the pipeline vibrates, the rubber shock-absorbing tube will weaken the vibration, and the pressure transmitter main body is fixed on the wall, preventing the vibration from being transmitted to the pressure transmitter main body and the measuring diaphragm through the guiding tube, and preventing the measurement result of the measuring diaphragm from being affected by the vibration, achieving the shock-absorbing effect on the pressure transmitter main body and further improving the measurement accuracy of the pressure transmitter main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 is a structural schematic diagram of the support tube of the present invention;

[0020] Figure 3 is a structural schematic diagram of the connection cover of the present invention;

[0021] Figure 4 is a structural schematic diagram of the storage box of the present invention;

[0022] Figure 5 is a left-view schematic diagram of the connection tube structure of the present invention;

[0023] Figure 6 is a structural schematic diagram of the push plate of the present invention;

[0024] Figure 7 is Figure 6 a partial structural schematic diagram of A in;

[0025] Figure 8 is a structural schematic diagram of the limit post of the present invention

[0026] Figure 9 is a rear-view schematic diagram of the top plate structure of the present invention;

[0027] Figure 10 is a structural schematic diagram of the fixing hole of the present invention;

[0028] Figure 11 is Figure 10 a partial structural schematic diagram of B in.

[0029] In the figure: 1. Pressure transmitter main body; 2. Installation pipe; 3. Measuring diaphragm; 4. Connection cover; 5. Guide pipe; 6. Accurate measurement mechanism; 7. Shock absorption mechanism; 8. Drain valve; 9. Drain pipe; 10. Rubber shock absorption pipe; 11. Temperature measurer; 12. Support pipe; 13. Cooling pipe; 14. Connection pipe; 15. Water inlet pipe; 16. Support box; 17. Storage tank; 18. Sealing ring; 19. Heat dissipation cylinder; 20. Heat dissipation pipe; 21. Heat dissipation fin; 22. Connection column; 23. Support ring; 24. First valve; 25. Second valve; 26. Connecting rod; 27. Protection box; 28. First electric push rod; 29. Feeding valve; 30. Second electric push rod; 31. Horizontal plate; 32. Moving column; 33. Cover plate; 34. Baffle plate; 35. Limiting hole; 36. Electronic scale; 37. Pushing plate; 38. Limiting block; 39. Support rod; 40. Support block; 41. Moving rod; 42. Limiting groove; 43. Limiting column; 44. Connection plate; 45. Top plate; 46. Fixing hole; 47. Moving hole; 48. Pushing column; 49. Clamping hole; 50. Clamping column; 51. Positioning rod; 52. Sliding groove; 53. Slider; 54. Moving ring; 55. Spring; 56. Check valve; 57. Placing block. Specific embodiments

[0030] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1: Please refer to Figures 1 to 9 , a piezoresistive pressure transmitter, including a pressure transmitter main body 1, an installation pipe 2 is fixedly installed on the outer circumferential wall surface of the pressure transmitter main body 1, a measuring diaphragm 3 is fixedly sleeved on the inner circumferential wall surface of the installation pipe 2, a pressure sensor for cooperating with the measuring diaphragm 3 is fixedly installed on the inner circumferential wall surface of the installation pipe 2, threads are provided on the outer circumferential wall surface of the installation pipe 2, a connection cover 4 is threadedly connected to the outer circumferential wall surface of the installation pipe 2, a guide pipe 5 for connecting with a pipeline is fixedly installed on the bottom surface of the connection cover 4, a sealing ring 18 is fixedly installed on the inner circumferential wall surface of the connection cover 4, the sealing ring 18 can reduce the gap between the measuring diaphragm 3 and the connection cover 4 and improve the sealing performance of the connection cover 4, a temperature measurer 11 for measuring the temperature of hot water is fixedly installed on the outer circumferential wall surface of the guide pipe 5, an accurate measurement mechanism 6 for improving the measurement accuracy of the pressure transmitter main body 1 is arranged on the outer circumferential wall surface of the guide pipe 5; a shock absorption mechanism 7 for damping the pressure transmitter main body 1 is arranged at one end of the pressure transmitter main body 1;

[0032] The accurate measurement mechanism 6 includes a cooling pipe 13, which is fixedly installed on the outer circumferential wall surface of the guiding pipe 5. The lower half of the cooling pipe 13 bends downward. The cooling pipe 13 has the same inner diameter as the guiding pipe 5. By increasing the bending of the cooling pipe 13, the length of the cooling pipe 13 is increased, thereby enhancing the path of the hot water movement and helping the hot water cool down. A heat dissipation cylinder 19 is fixedly sleeved on the outer circumferential wall surface of the cooling pipe 13. Two first valves 24 are fixedly sleeved on the inner circumferential wall surface of the guiding pipe 5. The first valves 24 open and close to switch the path of the hot water. The inside of the heat dissipation cylinder 19 is filled with cooling oil. Two heat dissipation pipes 20 for allowing the cooling oil to flow are fixedly installed on the outer circumferential wall surface of the heat dissipation cylinder 19. Both ends of the heat dissipation pipe 20 penetrate through the heat dissipation cylinder 19. A plurality of heat dissipation fins 21 are fixedly sleeved on the outer circumferential wall surface of the heat dissipation pipe 20. When the hot water enters the inside of the cooling pipe 13, it will pass through the heat dissipation cylinder 19 from left to right. When initially entering, the cooling oil at the left end of the heat dissipation cylinder 19 is heated. The cooling oil absorbs the heat in the hot water to reduce the temperature of the hot water. The heated cooling oil makes the cooling oil enter the inside of the heat dissipation pipe 20. The heat of the cooling oil entering the inside of the heat dissipation pipe 20 will be transferred to the plurality of heat dissipation fins 21. The contact between the air and the heat dissipation fins 21 causes the heat on the heat dissipation fins 21 to dissipate into the air, thereby cooling the cooling oil. A connecting pipe 14 is fixedly installed on the outer circumferential wall surface of the guiding pipe 5. One end of the connecting pipe 14 is fixedly installed with a support box 16. One end of the connecting pipe 14 penetrates through the support box 16. A water inlet pipe 15 for water inlet is fixedly installed on the outer circumferential wall surface of the support box 16. A flange is fixedly sleeved on the outer circumferential wall surface of the water inlet pipe 15. Through the flange, an external pipe can be connected to the water inlet pipe 15. A one-way valve 56 is fixedly sleeved inside the connecting pipe 14. The water entering through the water inlet pipe 15 by the one-way valve 56 can only enter the guiding pipe 5 and the cooling pipe 13 through the connecting pipe 14, preventing the hot water inside the guiding pipe 5 and the cooling pipe 13 from entering the connecting pipe 14;

[0033] A baffle plate 34 is slidably connected inside the support box 16. A cover plate 33 is fixedly installed on the inner top surface of the support box 16. The cover plate 33 can block the gap between the top surface of the baffle plate 34 and the support box 16. Limiting holes 35 are opened on both sides of the support box 16. A limiting block 38 is slidably connected inside the limiting holes 35. A support rod 39 is fixedly installed inside the limiting holes 35. The support rod 39 penetrates through the limiting block 38, and the limiting block 38 moves along the support rod 39. The support rod 39 can limit the movement of the limiting block 38. A placing block 57 is fixedly installed on one side of the baffle plate 34. One side of the limiting block 38 is rotatably connected to a connecting rod 26 through a pin. The other end of the connecting rod 26 is rotatably connected to the placing block 57 through a pin. Activity rods 41 are rotatably connected to both sides inside the support box 16 through pins. A support block 40 is fixedly installed on one side of the baffle plate 34. One end of the activity rod 41 is rotatably connected to one side of the support block 40 through a pin. An activity column 32 is fixedly installed on the bottom surface of the limiting block 38. Protection boxes 27 are fixedly installed on both sides of the support box 16. The protection boxes 27 can prevent the cleaning agent inside the support box 16 from leaking through the limiting holes 35. The bottom end of the activity column 32 penetrates through the protection box 27 and is fixedly installed with a cross plate 31. A second electric push rod 30 for driving the activity column 32 to move is installed on the bottom surface of the support box 16. The bottom surface of the telescopic shaft of the second electric push rod 30 is fixedly connected to the top surface of the cross plate 31. A push plate 37 for pushing the cleaning agent to move forward is arranged on one side inside the support box 16. The height of the push plate 37 is the same as that of the baffle plate 34. The movement of the push plate 37 inside the support box 16 drives the cleaning agent to move forward. A first electric push rod 28 for driving the push plate 37 to move is installed on one side of the support box 16. The telescopic shaft of the first electric push rod 28 penetrates through the support box 16 and is fixedly connected to one side of the push plate 37. One end of the pressure transmitter main body 1 is fixedly installed with a PLC controller. The first valve 24, the second valve 25, the first electric push rod 28 and the cross plate 31 are all electrically connected to the PLC controller;

[0034] Through the above technical features, by setting the pressure transmitter main body 1, the staff installs the pressure transmitter main body 1 on the pipeline for use. The temperature measuring device 11 on the inner wall of the guiding pipe 5 can measure the temperature of the hot water. The staff sets a threshold value for the temperature measuring device 11. This threshold value is the maximum temperature that the measuring diaphragm 3 can withstand when accurately measuring the temperature of the hot water. When the temperature exceeds this threshold value, the resistance of the measuring diaphragm 3 will change due to the temperature of the hot water, affecting the measurement result. And the threshold value is determined by the material and size of the measuring diaphragm 3;

[0035] When the temperature of the hot water is lower than the threshold value, the two second valves 25 are in the closed state while the first valve 24 is open. The hot water is conveyed upward through the two first valves 24 in the guiding pipe 5 to contact the measuring diaphragm 3. The measuring diaphragm 3 deforms under the action of the hot water pressure. In cooperation with the pressure sensor through the deformation of the measuring diaphragm 3, it is finally converted into a signal and displayed on the display screen of the pressure transmitter main body 1;

[0036] When the temperature measuring device 11 detects that the temperature of the hot water entering the inside of the guiding pipe 5 is higher than the threshold value, the temperature measuring device 11 will transmit a signal to the PLC controller. After receiving the signal, the PLC controller will close the upper first valve 24 to prevent the hot water from continuing to move upward along the guiding pipe 5, while the lower first valve 24 remains open. At the same time, the two second valves 25 are opened.

[0037] The hot water passes through the lower first valve 24 and then enters the cooling pipe 13 through the lower second valve 25. The lower half of the cooling pipe 13 bends downward with a longer path. When the hot water passes through, its heat dissipates into the air through the cooling pipe 13 and the temperature decreases. The hot water continues to move forward inside the cooling pipe 13 and passes through the heat dissipation cylinder 19 from left to right. When the hot water enters the left end of the heat dissipation cylinder 19, the cooling oil inside the heat dissipation cylinder 19 will absorb the heat of the hot water. After the cooling oil inside the heat dissipation cylinder 19 absorbs the heat of the hot water, it will enter the inside of the heat dissipation pipe 20. The heat of the cooling oil entering the inside of the heat dissipation pipe 20 will be transferred to multiple heat dissipation fins 21. The heat on the heat dissipation fins 21 will dissipate into the air, thereby reducing the temperature of the cooling oil. The cooled cooling oil is continuously conveyed forward through the heat dissipation pipe 20 and returns to the inside of the heat dissipation cylinder 19 to realize the circulation of the cooling oil. After the hot water passes through the heat dissipation cylinder 19, the temperature further decreases. The hot water with decreased temperature will contact the measuring diaphragm 3, preventing the resistance of the measuring diaphragm 3 from changing due to the influence of the hot water temperature exceeding the threshold value of the measuring diaphragm 3, avoiding the influence of the hot water temperature on the measurement result during the measurement of the hot water pressure, and improving the measurement accuracy;

[0038] Meanwhile, after long-term use, scale may form on the inner walls of the guide pipe 5 and the cooling pipe 13. The scale causes the inner diameters of the guide pipe 5 and the cooling pipe 13 to become smaller (at the same flow rate, the smaller the inner diameter, the greater the pressure), which may cause changes in the water pressure of the hot water and affect the accuracy. When cleaning the scale, the PLC controller will open two second valves 25 and at the same time open the upper first valve 24, while the lower first valve 24 is closed. The staff connects water to the water inlet pipe 15. The PLC controller starts the second electric push rod 30. The telescopic shaft of the second electric push rod 30 moves upward to drive the cross plate 31 to move upward. The upward movement of the cross plate 31 drives the movable column 32 to move upward. The inside of the limiting hole 35 on the movable box 16 moves upward along the support rod 39. The support rod 39 can limit the movement of the limiting block 38. The upward movement of the limiting block 38 drives the connecting rod 26 to rotate upward. One end of the connecting rod 26 rotates upward to drive the lower half of the baffle 34 to rotate upward and at the same time causes the upper half of the baffle 34 to rotate downward. The downward rotation of the upper half of the baffle 34 drives the support block 40 to rotate downward. The downward rotation of the support block 40 drives the movable rod 41 to rotate downward, so that the baffle 34 flips outward;

[0039] Then the PLC controller starts the first electric push rod 28. The telescopic shaft of the first electric push rod 28 moves outward to drive the push plate 37 to move outward, pushing the cleaning agent inside the support box 16 into the connecting pipe 14. At this time, the water in the external pipeline enters the connecting pipe 14 through the water inlet pipe 15. The water is mixed with the cleaning agent and enters the inside of the guide pipe 5 and the cooling pipe 13 through the one-way valve 56. The mixture of the cleaning agent and water flushes the guide pipe 5 and the cooling pipe 13 in the reverse direction, causing the scale on the inner walls of the guide pipe 5 and the cooling pipe 13 to fall off, avoiding the influence of the scale on the inner diameters of the guide pipe 5 and the cooling pipe 13, and preventing inaccurate measurement results caused by the reduction of the inner diameters of the guide pipe 5 and the cooling pipe 13, further improving the measurement accuracy;

[0040] During this process, the staff can not only avoid the influence of the hot water temperature on the measurement of the hot water pressure, but also clean the scale on the inner walls of the guide pipe 5 and the cooling pipe 13, improve the accuracy of the measurement results, achieve accurate measurement of the water pressure, and facilitate the staff to use the pressure transmitter main body 1 in the pipeline;

[0041] The top surface of the support box 16 is fixedly installed with a storage tank 17 for storing a cleaning agent, which is used to clean the scale on the inner walls of the guiding pipe 5 and the cooling pipe 13. The bottom surface of the storage tank 17 is fixedly installed with a feeding valve 29 for discharging the cleaning agent. The feeding valve 29 penetrates through the support box 16 and extends into the interior of the support box 16. The staff stores the cleaning agent inside the storage tank 17, and the cleaning agent inside the storage tank 17 enters the interior of the support box 16 through the feeding valve 29. The bottom surface of the support box 16 is fixedly installed with an electronic scale 36 for weighing the cleaning agent. By presetting the weight on the electronic scale 36, the amount of cleaning agent used for flushing the guiding pipe 5 and the cooling pipe 13 is determined. The top surface of the storage tank 17 is installed with a feeding pipe for supplementing the cleaning agent;

[0042] Specifically, through the arranged storage tank 17, the staff stores the cleaning agent inside the support box 16. The staff sets the starting time for the feeding valve 29 and sets a suitable weight for the electronic scale 36. The specific data is determined according to the actual situation. The cleaning agent inside the storage tank 17 falls on the electronic scale 36 inside the support box 16 through the feeding valve 29. The electronic scale 36 can weigh the cleaning agent. When the weight reaches the set value, it will transmit a signal to the PLC controller. After receiving the signal, the PLC controller will close the feeding valve 29, so as to achieve quantitative feeding of the cleaning agent;

[0043] On both sides inside the support box 16, limiting grooves 42 for the sliding of the baffle 34 are provided. On both sides of the baffle 34, limiting posts 43 are fixedly installed. The limiting posts 43 are slidably connected with the limiting grooves 42. The limiting posts 43 are cylindrical. When the baffle 34 flips upward, it drives the limiting posts 43 to rotate inside the limiting grooves 42;

[0044] Specifically, through the arranged baffle 34, when the baffle 34 moves upward, it drives the limiting posts 43 to move inside the limiting grooves 42 on the inner side of the support box 16. The limiting posts 43 can limit the movement of the baffle 34, achieving the limiting effect on the baffle 34;

[0045] A sewage discharge valve 8 is fixedly installed on the outer circumferential wall surface of the guiding pipe 5. A sewage discharge pipe 9 for sewage discharge is fixedly sleeved on the inner circumferential wall surface of the sewage discharge valve 8. The sewage discharge valve 8 is electrically connected to the PLC controller;

[0046] Specifically, through the arranged guiding pipe 5, when using the cleaning agent to clean the scale inside the guiding pipe 5 and the cooling pipe 13, the two second valves 25 in the cooling pipe 13 and the upper first valve 24 are in the open state, while the lower first valve 24 is closed. At this time, the PLC controller will also open the sewage discharge valve 8. The water, cleaning agent and scale flushed in the reverse direction of the guiding pipe 5 and the cooling pipe 13 are discharged to the outside through the sewage discharge valve 8 and the sewage discharge pipe 9, achieving the sewage discharge effect on the guiding pipe 5 and the cooling pipe 13;

[0047] Embodiment 2: Please refer to Figures 1 to 11, a piezoresistive pressure transmitter, different from that of Embodiment 1 in that the shock absorption mechanism 7 includes a support pipe 12 fixedly installed at one end of the pressure transmitter body 1. A connecting plate 44 is slidably connected inside the support pipe 12. Two positioning rods 51 are slidably connected to the inner bottom surface of the support pipe 12. The positioning rods 51 penetrate through the connecting plate 44. An active ring 54 is elastically connected to the outer wall surface of the positioning rod 51 through an elastic member. When the connecting plate 44 moves along the positioning rod 51, it drives the active ring 54 to move downward along the positioning rod 51. Two clamping columns 50 are fixedly installed on the top surface of the connecting plate 44. The clamping columns 50 are movably clamped with the support pipe 12. A number of clamping holes 49 are formed on the top surface of the support pipe 12. The inner wall surface of the clamping column 50 is movably clamped with the outer wall surface of the clamping hole 49. A rubber shock-absorbing pipe 10 is fixedly installed on the bottom surface of the guiding pipe 5. A flange is fixedly sleeved on the outer wall surface of the rubber shock-absorbing pipe 10. The staff installs the guiding pipe 5 together with the rubber shock-absorbing pipe 10 on the pipeline through the flange. The vibration of the pipeline will be transmitted to the rubber shock-absorbing pipe 10. The rubber shock-absorbing pipe 10 can weaken the vibration and prevent the vibration of the pipeline from driving the vibration of the pressure transmitter body 1 and the measuring diaphragm 3 inside the installation pipe 2, avoiding the influence of the vibration on the measurement of the subsequent water pressure by the measuring diaphragm 3. A top plate 45 is fixedly installed on one side of the connecting plate 44. Two fixing holes 46 are formed on one side of the top plate 45. An activity hole 47 is formed on the top surface of the support pipe 12. A push column 48 is fixedly installed on the top surface of the connecting plate 44. The push column 48 is slidably connected with the activity hole 47;

[0048] Specifically, through the provided rubber shock-absorbing pipe 10, the staff connects the rubber shock-absorbing pipe 10 to the pipeline. The staff moves the push column 48 downward. The downward movement of the push column 48 drives the connecting plate 44 to move downward along the positioning rod 51. The downward movement of the connecting plate 44 along the positioning rod 51 drives the active ring 54 to move downward and at the same time compresses the spring 55. The downward movement of the connecting plate 44 also drives the clamping column 50 to move downward. The downward movement of the clamping column 50 will separate from the clamping hole 49 on the support pipe 12. Without the restriction of the clamping column 50, the staff moves the push column 48 outward. The push column 48 moves outward inside the activity hole 47 on the support pipe 12 and drives the connecting plate 44 to move outward. The outward movement of the connecting plate 44 drives the two positioning rods 51 to move outward. The outward movement of the connecting plate 44 also makes the top plate 45 move outward. The staff makes the top plate 45 abut against the side wall of the wall by moving the push column 48 outward;

[0049] The staff loosens the push column 48, and the acting force of the spring 55 causes the movable ring 54 to drive the connecting plate 44 to move upward along the positioning rod 51. The upward movement of the connecting plate 44 drives the clamping column 50 into the inside of the clamping hole 49 on the support pipe 12, thereby determining the positions of the connecting plate 44 and the top plate 45. The staff puts the bolt into the fixing hole 46 on the top plate 45 to fix the pressure transmitter body 1. When the pipeline vibrates, the rubber shock-absorbing pipe 10 will weaken the vibration and the pressure transmitter body 1 is fixed on the wall, preventing the vibration from being transmitted to the pressure transmitter body 1 and the measuring diaphragm 3 through the guiding pipe 5, and preventing the measurement result of the measuring diaphragm 3 from being affected by the vibration, achieving the shock-absorbing effect on the pressure transmitter body 1 and further improving the measurement accuracy of the pressure transmitter body 1;

[0050] Two sliding grooves 52 for the positioning rod 51 to slide are formed on the bottom surface of the support pipe 12. A slider 53 is fixedly installed on the bottom surface of the positioning rod 51, and the slider 53 is slidably connected with the sliding groove 52. Both the sliding groove 52 and the slider 53 are T-shaped structures, preventing the slider 53 from falling off the sliding groove 52 when the slider 53 slides inside the sliding groove 52. The elastic member is the spring 55. One end of the spring 55 is fixedly connected to the bottom surface of the movable ring 54, and the other end of the spring 55 is fixedly connected to the top surface of the slider 53. The spring 55 can provide a reset acting force for the connecting plate 44;

[0051] Specifically, through the arranged connecting plate 44, the outward movement of the connecting plate 44 inside the support pipe 12 drives the positioning rod 51 to move outward. The outward movement of the positioning rod 51 drives the slider 53 to slide outward inside the sliding groove 52. The cooperation of the sliding groove 52 and the slider 53 can limit the movement of the positioning rod 51, achieving the limiting effect on the positioning rod 51;

[0052] A support ring 23 is fixedly sleeved on the outer circumferential wall surface of the cooling pipe 13. A connecting column 22 is fixedly installed on the outer circumferential wall surface of the support ring 23. One side of the connecting column 22 is fixedly connected to the outer circumferential wall surface of the guiding pipe 5. Through the arranged support ring 23 and the first valve 24, the support ring 23 and the first valve 24 can support the cooling pipe 13 and improve the stability of the cooling pipe 13.

[0053] Working principle: Through the rubber shock-absorbing pipe 10 provided, the staff installs the rubber shock-absorbing pipe 10 on the pipeline by using a flange. The staff moves the push column 48 downward. When the push column 48 moves downward, the connecting plate 44 moves downward under the cooperation of the positioning rod 51, the movable ring 54 and the spring 55, and at the same time, the clamping column 50 is separated from the clamping hole 49. The staff drives the connecting plate 44 to move outward by moving the push column 48 outward until the top plate 45 abuts against the wall. The staff puts the bolt into the fixing hole 46 on the top plate 45, so as to fix the pressure transmitter main body 1 on the wall. The vibration of the pipeline will be weakened by the rubber shock-absorbing pipe 10 and will not be transmitted to the pressure transmitter main body 1 and the measuring diaphragm 3, reducing the influence of vibration on the measuring diaphragm 3;

[0054] Secondly, the temperature measurer 11 on the guiding pipe 5 can measure the temperature of the hot water. When the temperature of the hot water is lower than the threshold value, the hot water contacts the measuring diaphragm 3 through the guiding pipe 5. When the temperature of the hot water exceeds the threshold value, the hot water enters the inside of the cooling pipe 13 through the guiding pipe 5. The path of the cooling pipe 13 is relatively long to reduce the temperature of the hot water. Then, with the cooperation of the cooling oil inside the heat dissipation cylinder 19, the heat dissipation pipe 20 and the heat dissipation fins 21, the temperature of the hot water is reduced again, preventing the measuring diaphragm 3 from contacting the hot water with too high temperature and avoiding damage to the measuring diaphragm 3 due to too high temperature of the hot water, ensuring the accuracy of subsequent measurement;

[0055] Finally, after the guiding pipe 5 and the cooling pipe 13 are used for a long time, there will be scale on their inner walls, resulting in a smaller inner diameter of the guiding pipe 5 and the cooling pipe 13. The cleaning agent in the storage box 17 enters the inside of the support box 16 through the blanking valve 29. The staff makes the baffle 34 turn upward by the second electric push rod 30. The first electric push rod 28 starts to drive the push plate 37 to move forward to push the cleaning agent into the inside of the connecting pipe 14. The water in the external pipeline enters the connecting pipe 14 through the water inlet pipe 15 and is mixed with the cleaning agent. The water and the cleaning agent are mixed to wash the guiding pipe 5 and the cooling pipe 13 from opposite directions, cleaning the scale on the inner walls of the guiding pipe 5 and the cooling pipe 13 and preventing the scale from affecting the measurement accuracy.

[0056] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A piezoresistive pressure transmitter, characterized in that, Including: A pressure transmitter body, on the outer circumferential wall surface of the pressure transmitter body, there is an installation pipe fixedly installed. On the inner circumferential wall surface of the installation pipe, there is a measuring diaphragm fixedly sleeved. On the outer circumferential wall surface of the installation pipe, there is a connection cover threadedly connected. On the bottom surface of the connection cover, there is a guiding pipe fixedly installed for connecting with a pipeline. On the inner circumferential wall surface of the connection cover, there is a sealing ring fixedly installed. On the outer circumferential wall surface of the guiding pipe, there is a temperature measuring device fixedly installed for measuring the temperature of hot water. On the outer circumferential wall surface of the guiding pipe, there is an accurate measuring mechanism for improving the measuring accuracy of the pressure transmitter body. At one end of the pressure transmitter body, there is a shock absorption mechanism for shock-absorbing the pressure transmitter body; The accurate measuring mechanism includes a cooling pipe, the cooling pipe is fixedly installed on the outer circumferential wall surface of the guiding pipe. The lower half of the cooling pipe bends downward. On the outer circumferential wall surface of the cooling pipe, there is a heat dissipation cylinder fixedly sleeved. On the inner circumferential wall surface of the guiding pipe, there are two first valves fixedly sleeved. Inside the heat dissipation cylinder, there is cooling oil filled. On the outer circumferential wall surface of the heat dissipation cylinder, there are two heat dissipation pipes fixedly installed for allowing the cooling oil to flow. On the outer circumferential wall surface of the heat dissipation pipe, there are several heat dissipation fins fixedly sleeved. On the outer circumferential wall surface of the guiding pipe, there is a connecting pipe fixedly installed. At one end of the connecting pipe, there is a support box fixedly installed. On the outer circumferential wall surface of the support box, there is a water inlet pipe fixedly installed for water inlet. Inside the support box, there is a baffle slidably connected. On both sides of the support box, there are limiting holes opened. Inside the limiting holes, there are limiting blocks slidably connected. On one side of the baffle, there is a placing block fixedly installed. On one side of the limiting block, there is a connecting rod rotatably connected. The other end of the connecting rod is rotatably connected with the placing block. On both sides inside the support box, there are movable rods rotatably connected. On one side of the baffle, there is a support block fixedly installed. One end of the movable rod is rotatably connected with one side of the support block. On the bottom surface of the limiting block, there is a movable column fixedly installed. At the bottom end of the movable column, there is a cross plate fixedly installed. On the bottom surface of the support box, there is a second electric push rod installed for driving the movable column to move. On one side inside the support box, there is a push plate for pushing the cleaning agent to move forward. On one side of the support box, there is a first electric push rod installed for driving the push plate to move.

2. A piezoresistive pressure transmitter according to claim 1, characterized in that: On the top surface of the support box, there is a storage box fixedly installed for storing the cleaning agent. On the bottom surface of the storage box, there is a blanking valve fixedly installed for discharging the cleaning agent. On the bottom surface of the support box, there is an electronic scale fixedly installed for weighing the cleaning agent.

3. A piezoresistive pressure transmitter according to claim 2, characterized in that: On both sides inside the support box, there are limiting grooves provided for the baffle to slide. On both sides of the baffle, there are limiting columns fixedly installed. The limiting columns are slidably connected with the limiting grooves.

4. A piezoresistive pressure transmitter according to claim 1, characterized in that: On the outer circumferential wall surface of the guiding pipe, there is a sewage discharge valve fixedly installed. On the inner circumferential wall surface of the sewage discharge valve, there is a sewage discharge pipe fixedly sleeved for sewage discharge. The sewage discharge valve is electrically connected with a PLC controller.

5. A piezoresistive pressure transmitter according to claim 1, characterized in that: The shock absorption mechanism includes a support pipe, the support pipe is fixedly installed at one end of the pressure transmitter body. Inside the support pipe, there is a connecting plate slidably connected. On the inner bottom surface of the support pipe, there are two positioning rods slidably connected. The positioning rods penetrate through the connecting plate. On the outer circumferential wall surface of the positioning rods, there is a movable ring elastically connected through an elastic member. On the top surface of the connecting plate, there are two clamping columns fixedly installed. The clamping columns are movably clamped with the support pipe. On the bottom surface of the guiding pipe, there is a rubber shock absorption pipe fixedly installed. On one side of the connecting plate, there is a top plate fixedly installed. On one side of the top plate, there are two fixing holes opened.

6. A piezoresistive pressure transmitter according to claim 5, characterized in that: Two sliding grooves for the positioning rod to slide are provided on the bottom surface of the support pipe. A slider is fixedly installed on the bottom surface of the positioning rod, and the slider is slidably connected to the sliding groove.

7. A piezoresistive pressure transmitter according to claim 2, characterized in that: A support ring is fixedly sleeved on the outer circumferential wall surface of the cooling pipe. A connecting column is fixedly installed on the outer circumferential wall surface of the support ring, and one side of the connecting column is fixedly connected to the outer circumferential wall surface of the guiding pipe.

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