Piezoresistive pressure transmitter

Abstract

The invention discloses a piezoresistive pressure transmitter, which belongs to the technical field of pressure transmitters, and comprises a pressure transmitter main body, a mounting tube is fixedly mounted on the outer circular wall surface of the pressure transmitter main body, and a measuring diaphragm is fixedly sleeved on the inner circular wall surface of the mounting tube. Through mutual cooperation of the pressure transmitter main body, the guide 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 hot water can be reduced; through mutual cooperation of a guide pipe, a cooling pipe, a second valve, a first valve, a transverse plate, a movable column, a limiting block, a limiting hole, a supporting box, a connecting rod, a baffle, a supporting block, a movable rod, a first electric push rod, a water inlet pipe and a push plate, a cleaning agent can be mixed with water, and the guide pipe and the cooling pipe are subjected to reverse flushing, so that accurate measurement of water pressure is achieved; and a worker can conveniently use the pressure transmitter main body in a pipeline.

Description

Technical Field

[0001] The invention relates to the field of pressure transmitters, in particular to a piezoresistive pressure transmitter. Background Art

[0002] A pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into standard electrical signals. Piezoresistive pressure transmitter is a type of pressure transmitter. A piezoresistive element is installed inside the piezoresistive pressure transmitter. When external pressure acts on the piezoresistive element, its resistance value will change accordingly. This change is based on the piezoresistive effect, that is, the phenomenon that the resistance value of a material changes when it is subjected to external force. It has high precision: the piezoresistive pressure transmitter can accurately measure the change of pressure, has high measurement accuracy, is stable and reliable: because it works based on the physical properties of the material, it has high stability and reliability, and is widely used: it is widely used in industrial automation, petroleum, chemical industry, machinery, aviation and other fields.

[0003] After searching, it was found that there were problems with the piezoresistive pressure transmitter in the prior art. The piezoresistive pressure transmitter measures the pressure by measuring the deformation of the diaphragm after being subjected to pressure and cooperating with the corresponding sensor. When the piezoresistive pressure transmitter is used to measure the pressure of hot water, since the resistance value of the diaphragm on the piezoresistive pressure transmitter has the characteristic of changing with temperature, when the hot water pressure acts on the single crystal silicon diaphragm, the diaphragm will produce strain. This strain will cause the strain resistance value directly diffused on the diaphragm to change, and the temperature of the hot water will also cause the strain resistance on the diaphragm to change. The value change interferes with the measurement of the piezoresistive pressure transmitter, causing the piezoresistive pressure transmitter to measure the hot water pressure inaccurately, affecting the accuracy of the measurement. At the same time, after long-term use of the guide pipe, the scale of the hot water may adhere to the inner wall of the guide pipe, and the scale changes the inner diameter of the inner wall of the guide pipe. At the same flow rate of hot water, the smaller the inner diameter of the pipe, the greater the pressure. The change in the inner diameter of the guide pipe is bound to cause the piezoresistive pressure transmitter to measure the hot water pressure. The change will also reduce the accuracy of the measurement and affect the staff's use of the piezoresistive pressure transmitter. Therefore, based on the above search and combined with the prior art, the present invention provides a piezoresistive pressure transmitter to solve the problems existing in the background technology. Summary of the invention

[0004] The purpose of the present invention is to provide a piezoresistive pressure transmitter having the advantages of high accuracy and little influence by temperature, and solves the problem that the temperature of hot water will also cause the change of the strain resistance value on the diaphragm to interfere with the measurement of the piezoresistive pressure transmitter, resulting in inaccurate measurement results of the hot water pressure by the piezoresistive pressure transmitter.

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

[0006] A piezoresistive pressure transmitter comprises a pressure transmitter body, a mounting tube is fixedly mounted on the outer circumferential wall of the pressure transmitter body, a measuring diaphragm is fixedly sleeved on the inner circumferential wall of the mounting tube, a connecting cover is threadedly connected to the outer circumferential wall of the mounting tube, a guide tube for connecting to a pipeline is fixedly mounted on the bottom surface of the connecting cover, a sealing ring is fixedly mounted on the inner circumferential wall of the connecting cover, a temperature measuring device for measuring the temperature of hot water is fixedly mounted on the outer circumferential wall of the guide tube, an accurate measuring mechanism for improving the measurement accuracy of the pressure transmitter body is provided on the outer circumferential wall of the guide tube, and a shock absorbing mechanism for shock absorbing the pressure transmitter body is provided at one end of the pressure transmitter body.

[0007] Furthermore, the accurate measuring mechanism includes a cooling tube, which is fixedly mounted on the outer circular wall of the guide tube, the lower half of the cooling tube is bent downward, the outer circular wall of the cooling tube is fixedly sleeved with a heat dissipation tube, the inner circular wall of the guide tube is fixedly sleeved with two first valves, the interior of the heat dissipation tube is filled with cooling oil, the outer circular wall of the heat dissipation tube is fixedly mounted with two heat dissipation tubes for allowing the cooling oil to flow, the outer circular wall of the heat dissipation tube is fixedly sleeved with a plurality of heat dissipation fins, the outer circular wall of the guide tube is fixedly mounted with a connecting tube, one end of the connecting tube is fixedly mounted with a support box, the outer circular wall of the support box is fixedly mounted with a water inlet pipe for water inlet, the interior of the support box is slidably connected with a baffle, and both sides of the support box are open A limiting hole is provided, the limiting hole is slidably connected to the inside of the limiting hole, 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, and the other end of the connecting rod is rotatably connected to the placing block, movable rods are rotatably connected to both sides of the interior of the support box, a supporting 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 on 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 detergent forward is provided on one side of 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] Furthermore, a storage box for storing detergent is fixedly mounted on the top surface of the support box, a discharge valve for feeding detergent is fixedly mounted on the bottom surface of the storage box, and an electronic scale for weighing detergent is fixedly mounted on the bottom surface of the support box.

[0009] Furthermore, both sides of the interior of the support box are provided with limiting grooves for the baffle to slide, and both sides of the baffle are fixedly installed with limiting columns, and the limiting columns are slidably connected to the limiting grooves.

[0010] Furthermore, a drain valve is fixedly mounted on the outer circumferential wall of the guide pipe, a drain pipe for draining sewage is fixedly sleeved on the inner circumferential wall of the drain valve, and the drain valve is electrically connected to the PLC controller.

[0011] Furthermore, the shock absorbing mechanism includes a support tube, which is fixedly installed at one end of the pressure transmitter body, and a connecting plate is slidably connected to the interior of the support tube. Two positioning rods are slidably connected to the inner bottom surface of the support tube, and the positioning rods penetrate the connecting plate. The outer circular wall surface of the positioning rods is elastically connected to a movable ring through an elastic member, and two clamping columns are fixedly installed on the top surface of the connecting plate, and the clamping columns are movably clamped with the support tube, a rubber shock-absorbing tube is fixedly installed on the bottom surface of the guide tube, and a top plate is fixedly installed on one side of the connecting plate, and two fixing holes are provided on one side of the top plate.

[0012] Furthermore, two sliding grooves are provided on the bottom surface of the support tube for sliding the positioning rod, and a sliding block is fixedly mounted on the bottom surface of the positioning rod, and the sliding block is slidably connected to the sliding grooves.

[0013] Furthermore, a support ring is fixedly sleeved on the outer circular wall of the cooling tube, a connecting column is fixedly installed on the outer circular wall of the support ring, and one side of the connecting column is fixedly connected to the outer circular wall of the guide tube.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the cooperation of the set pressure transmitter body, guide pipe, temperature measuring device, measuring diaphragm, second valve, first valve, cooling pipe, heat dissipation tube, heat dissipation pipe and heat sink, the temperature can be lowered when the hot water temperature exceeds the threshold value, so as to avoid the inaccuracy of the measuring diaphragm caused by the hot water temperature exceeding the threshold value of the measuring diaphragm. Through the cooperation of the set guide pipe, cooling pipe, second valve, first valve, cross plate, movable column, limiting block, limiting hole, support box, connecting rod, baffle, support block, movable rod, first electric push rod, water inlet pipe and push plate, the detergent can be mixed with water and the guide pipe and cooling pipe can be reversely flushed to clean the scale therein. In this process, the staff can not only reduce the influence of hot water temperature on the hot water pressure measurement, but also clean the scale on the inner wall of the guide pipe and cooling pipe, so as to improve the accuracy of the measurement result, achieve accurate measurement of water pressure, and facilitate the staff to use the pressure transmitter body in the pipeline.

[0016] 2. Through the provided storage box, the staff stores the cleaning agent inside the support box. Through the cooperation of the provided discharge valve, electronic scale, storage box and support box, the cleaning agent can be quantitatively introduced into the support box, thereby allowing the cleaning agent to be quantitatively delivered.

[0017] 3. Through the rubber shock-absorbing tube, the staff connects the rubber shock-absorbing tube to the pipeline, and through the push column, connecting plate, positioning rod, movable ring, spring, clamping column, support tube, clamping hole, movable hole and top plate, the pressure transmitter body can be fixed. When the pipeline vibrates, the rubber shock-absorbing tube will weaken the vibration and the pressure transmitter body will be fixed on the wall to prevent the vibration from being transmitted to the pressure transmitter body and the measuring diaphragm through the guide tube, and prevent the measurement result of the measuring diaphragm from being affected by the vibration, so as to achieve the shock-absorbing effect on the pressure transmitter body and further improve the accuracy of the pressure transmitter body measurement. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0022] Figure 5 It is a left schematic diagram of the connecting pipe structure of the present invention;

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

[0024] Figure 7 for Figure 6 Schematic diagram of the local structure of A;

[0025] Figure 8 Schematic diagram of the limiting column structure of the present invention

[0026] Fig. 9 It is a rear view schematic diagram of the top plate structure of the present invention;

[0027] Fig.10 It is a schematic diagram of the fixing hole structure of the present invention;

[0028] Fig.11 for Fig.10 Schematic diagram of the local structure of B.

[0029] In the figure: 1. Pressure transmitter body; 2. Mounting pipe; 3. Measuring diaphragm; 4. Connecting cover; 5. Guide pipe; 6. Accurate measuring mechanism; 7. Shock absorbing mechanism; 8. Drain valve; 9. Drain pipe; 10. Rubber shock absorbing pipe; 11. Temperature measuring device; 12. Support pipe; 13. Cooling pipe; 14. Connecting pipe; 15. Water inlet pipe; 16. Support box; 17. Storage box; 18. Sealing ring; 19. Heat dissipation tube; 20. Heat dissipation pipe; 21. Heat sink; 22. Connecting column; 23. Support ring; 24. First valve; 25. Second valve; 26. Connecting rod; 27. Protective box; 28. First An electric push rod; 29, a discharge valve; 30, a second electric push rod; 31, a horizontal plate; 32, a movable column; 33, a cover plate; 34, a baffle; 35, a limiting hole; 36, an electronic scale; 37, a push plate; 38, a limiting block; 39, a support rod; 40, a support block; 41, a movable rod; 42, a limiting groove; 43, a limiting column; 44, a connecting plate; 45, a top plate; 46, a fixing hole; 47, a movable hole; 48, a push column; 49, a snap-in hole; 50, a snap-in column; 51, a positioning rod; 52, a slide groove; 53, a slider; 54, a movable ring; 55, a spring; 56, a one-way valve; 57, a placement block. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1 to 9 A piezoresistive pressure transmitter comprises a pressure transmitter body 1, a mounting tube 2 is fixedly mounted on the outer circumferential wall of the pressure transmitter body 1, a measuring diaphragm 3 is fixedly sleeved on the inner circumferential wall of the mounting tube 2, a pressure sensor for use with the measuring diaphragm 3 is fixedly mounted on the inner circumferential wall of the mounting tube 2, a thread is provided on the outer circumferential wall of the mounting tube 2, a connecting cover 4 is threadedly connected to the outer circumferential wall of the mounting tube 2, a guide tube 5 for connecting with a pipeline is fixedly mounted on the bottom surface of the connecting cover 4, a sealing ring 18 is fixedly mounted on the inner circumferential wall of the connecting cover 4, the sealing ring 18 can reduce the gap between the measuring diaphragm 3 and the connecting cover 4, and improve the sealing performance of the connecting cover 4, a temperature measuring device 11 for measuring the temperature of hot water is fixedly mounted on the outer circumferential wall of the guide tube 5, an accurate measuring mechanism 6 for improving the measurement accuracy of the pressure transmitter body 1 is provided on the outer circumferential wall of the guide tube 5, and a shock absorbing mechanism 7 for shock absorbing the pressure transmitter body 1 is provided at one end of the pressure transmitter body 1;

[0032] The accurate measuring mechanism 6 includes a cooling tube 13, which is fixedly mounted on the outer circumferential wall of the guide tube 5. The lower half of the cooling tube 13 is bent downward. The cooling tube 13 has the same inner diameter as the guide tube 5. The length of the cooling tube 13 is increased by increasing the bending of the cooling tube 13, thereby improving the path for the hot water to move and helping the hot water to cool down. A heat sink 19 is fixedly sleeved on the outer circumferential wall of the cooling tube 13. Two first valves 24 are fixedly sleeved on the inner circumferential wall of the guide tube 5. The first valve 24 opens and closes to switch the path of the hot water. The interior of the heat sink 19 is filled with cooling oil. Two heat sinks 20 for allowing the cooling oil to flow are fixedly mounted on the outer circumferential wall of the heat sink 19. Both ends of the heat sink 20 penetrate the heat sink 19. A plurality of heat sinks 21 are fixedly sleeved on the outer circumferential wall of the heat sink 20. When hot water enters the cooling tube 13, it passes through the heat sink 19 from left to right. When it initially enters, the cooling oil at the left end of the heat sink 19 is heated. The cooling oil absorbs the heat in the hot water to lower the temperature of the hot water. The cooling oil is heated so that the cooling oil enters the interior of the heat dissipation pipe 20. The heat of the cooling oil entering the interior of the heat dissipation pipe 20 is transferred to the multiple heat sinks 21. The air contacts the heat sink 21 so that the heat on the heat sink 21 escapes into the air, thereby cooling the cooling oil. A connecting pipe 14 is fixedly installed on the outer circumferential wall of the guide pipe 5. A supporting box 16 is fixedly installed on one end of the connecting pipe 14. One end of the connecting pipe 14 passes through the supporting box 16. A water inlet pipe 15 for water inlet is fixedly installed on the outer circumferential wall of the supporting box 16. A flange is fixedly sleeved on the outer circumferential wall of the water inlet pipe 15. The external pipeline can be connected to the water inlet pipe 15 through the flange. A one-way valve 56 is fixedly sleeved inside the connecting pipe 14. The water entering through the water inlet pipe 15 can only enter the guide pipe 5 and the cooling pipe 13 through the connecting pipe 14, thereby preventing the hot water inside the guide pipe 5 and the cooling pipe 13 from entering the connecting pipe 14.

[0033] The support box 16 is slidably connected with a baffle plate 34 inside, and 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. Both sides of the support box 16 are provided with limiting holes 35, and the limiting holes 35 are slidably connected with limiting blocks 38. The limiting holes 35 are fixedly installed with support rods 39 inside the limiting holes. The support rods 39 penetrate the limiting blocks 38, and the limiting blocks 38 move along the support rods 39. The support rods 39 can limit the movement of the limiting blocks 38. A placement block 57 is fixedly installed on one side of the baffle plate 34. A connecting rod 26 is rotatably connected to one side of the limiting block 38 through a pin, and the other end of the connecting rod 26 is rotatably connected to the placement block 57 through a pin. Both sides of the interior of the support box 16 are rotatably connected with movable rods 41 through pins. A support block 40 is fixedly installed on one side of the baffle plate 34, and one end of the movable rod 41 is rotatably connected to one side of the support block 40 through a pin. A movable column 32 is fixedly installed on the bottom surface of the limiting block 38. A protective box 27 is fixedly installed on both sides, and the protective box 27 can prevent the detergent inside the support box 16 from leaking through the limiting hole 35. The bottom end of the movable column 32 passes through the protective box 27 and is fixedly installed with a cross plate 31. A second electric push rod 30 for driving the movable column 32 to move is installed on the bottom surface of the support box 16. The bottom surface of the telescopic axis 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 detergent forward is arranged on one side of the inner part of the support box 16. The height of the push plate 37 is the same as the height of the baffle 34. The push plate 37 moves inside the support box 16 to drive the detergent 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 axis of the first electric push rod 28 passes through the support box 16 and is fixedly connected to one side of the push plate 37. A PLC controller is fixedly installed on one end of the pressure transmitter body 1. 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 body 1, the staff installs the pressure transmitter body 1 on the pipeline for use, and the temperature measuring device 11 on the inner wall of the guide tube 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 ensuring accurate measurement of the hot water temperature. When the temperature exceeds this threshold value, the resistance of the measuring diaphragm 3 will change due to the hot water temperature, 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, the two second valves 25 are in a closed state and the first valve 24 is opened, and the hot water is transported upward through the two first valves 24 in the guide pipe 5 to contact the measuring diaphragm 3. The measuring diaphragm 3 is deformed under the action of the hot water pressure, and the deformation of the measuring diaphragm 3 cooperates with the pressure sensor and is finally converted into a signal and displayed on the display screen of the pressure transmitter body 1;

[0036] When the temperature measuring device 11 detects that the temperature of the hot water entering the guide pipe 5 is higher than the threshold value, the temperature measuring device 11 transmits a signal to the PLC controller. After receiving the signal, the PLC controller closes the first valve 24 at the top to prevent the hot water from continuing to move upward along the guide pipe 5, while the first valve 24 at the bottom is still open, and at the same time, the two second valves 25 are opened.

[0037] After passing through the first valve 24 at the bottom, the hot water enters the cooling pipe 13 through the second valve 25 at the bottom. The lower half of the cooling pipe 13 is bent downward and has a longer path. When the hot water passes through, its heat is dissipated into the air through the cooling pipe 13 and its temperature is lowered. The hot water continues to move forward inside the cooling pipe 13 and passes through the heat sink 19 from left to right. When the hot water enters the left end of the heat sink 19, the cooling oil inside the heat sink 19 absorbs the heat of the hot water. After absorbing the heat of the hot water, the cooling oil inside the heat sink 19 enters the inside of the heat sink 20. The heat of the cooling oil inside the heat sink 20 is reduced. The amount will be transferred to the multiple heat sinks 21, and the heat on the heat sink 21 will dissipate in the air, thereby reducing the temperature of the cooling oil. The cooled cooling oil is continuously transported forward to the inside of the heat sink 19 through the heat pipe 20, so as to realize the circulation of the cooling oil. The temperature of the hot water is further reduced after passing through the heat sink 19. The hot water with reduced temperature will contact the measuring diaphragm 3, so as to avoid the resistance of the measuring diaphragm 3 changing due to the hot water temperature exceeding the threshold of the measuring diaphragm 3, so as to avoid the hot water temperature affecting the measurement result during the measurement of the hot water pressure, thereby improving the measurement accuracy.

[0038] At the same time, scale may form on the inner wall of the guide pipe 5 and the cooling pipe 13 after long-term use. The scale causes the inner diameter of the guide pipe 5 and the cooling pipe 13 to become smaller (the flow rate is the same, the smaller the inner diameter, the greater the pressure), which may cause the water pressure of the hot water to change, affecting the accuracy. When cleaning the scale, the PLC controller will open the two second valves 25 and open the upper first valve 24 at the same time, while the lower first valve 24 is closed. The staff connects water to the water inlet pipe 15, and the PLC controller starts the second electric push rod 30. The telescopic axis of the second electric push rod 30 moves upward to drive the horizontal plate 31 to move upward. The horizontal plate 31 moves upward to drive the movable column 32 to move upward, the inner part of the limiting hole 35 on the movable box 16 moves upward along the support rod 39, and the support rod 39 can limit the movement of the limiting block 38. The limiting block 38 moves upward to drive the connecting rod 26 to rotate upward, and one end of the connecting rod 26 rotates upward to drive the lower half of the baffle 34 to rotate upward and the upper half of the baffle 34 to rotate downward. The upper half of the baffle 34 rotates downward to drive the supporting block 40 to rotate downward, and the supporting block 40 rotates downward to drive 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, and the telescopic shaft of the first electric push rod 28 moves outward to drive the push plate 37 to move outward to push the detergent inside the support box 16 to the inside of the connecting pipe 14. At this time, the water in the external pipeline enters the connecting pipe 14 through the water inlet pipe 15, and the water and the detergent are mixed and enter the inside of the guide pipe 5 and the cooling pipe 13 through the one-way valve 56. The detergent and water are mixed to flush the guide pipe 5 and the cooling pipe 13 in reverse, so that the scale on the inner wall of the guide pipe 5 and the cooling pipe 13 falls off, so as to prevent the scale from affecting the inner diameter of the guide pipe 5 and the cooling pipe 13, and prevent the measurement result from being inaccurate due to the reduction of the inner diameter of the guide pipe 5 and the cooling pipe 13, thereby further improving the measurement accuracy;

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

[0041] A storage box 17 for storing detergent is fixedly installed on the top surface of the support box 16. The detergent is used to clean the scale on the inner wall of the guide pipe 5 and the cooling pipe 13. A discharge valve 29 for feeding the detergent is fixedly installed on the bottom surface of the storage box 17. The discharge valve 29 penetrates the support box 16 and extends to the inside of the support box 16. The staff stores the detergent in the storage box 17. The detergent in the storage box 17 enters the inside of the support box 16 through the discharge valve 29. An electronic scale 36 for weighing the detergent is fixedly installed on the bottom surface of the support box 16. The amount of detergent used for flushing the guide pipe 5 and the cooling pipe 13 is determined by presetting the weight of the electronic scale 36. A feeding pipe for replenishing the detergent is installed on the top surface of the storage box 17.

[0042] Specifically, through the storage box 17, the staff stores the cleaning agent inside the support box 16, and the staff sets the start time for the discharge valve 29 and sets the appropriate weight for the electronic scale 36. The specific data is determined according to the actual situation. The cleaning agent inside the storage box 17 falls on the electronic scale 36 inside the support box 16 through the discharge valve 29. The electronic scale 36 can weigh the cleaning agent. When the weight is reached, the signal will be transmitted to the PLC controller. The PLC controller will close the discharge valve 29 after receiving the signal, so that the cleaning agent can be quantitatively discharged;

[0043] The inner sides of the support box 16 are provided with limit grooves 42 for the baffle 34 to slide. The baffle 34 is fixedly installed with limit posts 43 on both sides. The limit posts 43 are slidably connected with the limit grooves 42. The limit posts 43 are cylindrical. When the baffle 34 is turned upward, the limit posts 43 are driven to rotate inside the limit grooves 42.

[0044] Specifically, by setting the baffle 34, the baffle 34 moves upward to drive the limiting column 43 to move inside the limiting groove 42 inside the support box 16, and the limiting column 43 can limit the movement of the baffle 34 to achieve the limiting effect of the baffle 34;

[0045] A drain valve 8 is fixedly mounted on the outer circumferential wall of the guide pipe 5, a drain pipe 9 for draining sewage is fixedly sleeved on the inner circumferential wall of the drain valve 8, and the drain valve 8 is electrically connected to the PLC controller;

[0046] Specifically, through the guide pipe 5, when the scale inside the guide pipe 5 and the cooling pipe 13 is cleaned with a detergent, the two second valves 25 in the cooling pipe 13 and the first valve 24 located at the top are opened, while the first valve 24 located at the bottom is closed. At this time, the PLC controller will also open the drain valve 8, and the water and detergent used for reverse flushing the guide pipe 5 and the cooling pipe 13 together with the scale are discharged to the outside through the drain valve 8 and the drain pipe 9, thereby achieving the drainage effect on the guide pipe 5 and the cooling pipe 13;

[0047] Example 2: Please refer to Figures 1 to 11, a piezoresistive pressure transmitter, which differs from the embodiment 1 in that the shock absorbing mechanism 7 includes a support tube 12, which is fixedly mounted on one end of the pressure transmitter body 1, and the support tube 12 is slidably connected to a connecting plate 44 inside the support tube 12, and two positioning rods 51 are slidably connected to the inner bottom surface of the support tube 12, and the positioning rods 51 penetrate the connecting plate 44, and the outer circumferential wall surface of the positioning rod 51 is elastically connected to a movable ring 54 through an elastic member, and the connecting plate 44 moves along the positioning rod 51 to drive the movable ring 54 to move downward along the positioning rod 51, and two clamping columns 50 are fixedly mounted on the top surface of the connecting plate 44, and the clamping columns 50 are movably clamped with the support tube 12, and a plurality of clamping holes 49 are opened on the top surface of the support tube 12, and the inner circumferential wall surface of the clamping column 50 and the outer circumferential wall surface of the clamping hole 49 are connected to each other. The circular wall is movably connected, and a rubber shock-absorbing tube 10 is fixedly installed on the bottom surface of the guide tube 5. The outer circular wall of the rubber shock-absorbing tube 10 is fixedly sleeved with a flange. The staff installs the guide tube 5 together with the rubber shock-absorbing tube 10 on the pipeline through the flange. The vibration of the pipeline will be transmitted to the rubber shock-absorbing tube 10. The rubber shock-absorbing tube 10 can weaken the vibration, prevent the pipeline vibration from driving the pressure transmitter body 1 and the measuring diaphragm 3 inside the installation tube 2 to vibrate, and avoid the vibration affecting the measuring diaphragm 3 on the subsequent water pressure measurement. A top plate 45 is fixedly installed on one side of the connecting plate 44, and two fixing holes 46 are provided on one side of the top plate 45. A movable hole 47 is provided on the top surface of the support tube 12, and a push column 48 is fixedly installed on the top surface of the connecting plate 44, and the push column 48 is slidably connected with the movable hole 47;

[0048] Specifically, through the rubber shock-absorbing tube 10, the staff connects the rubber shock-absorbing tube 10 to the pipeline, and the staff moves the push column 48 downward. The push column 48 moves downward and drives the connecting plate 44 to move downward along the positioning rod 51. The connecting plate 44 moves downward along the positioning rod 51, drives the movable ring 54 to move downward, and at the same time, the spring 55 is compressed. The connection plate 44 moves downward and also drives the clamping column 50 to move downward. The clamping column 50 moves downward and separates from the clamping hole 49 on the support tube 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 movable hole 47 on the support tube 12 and drives the connecting plate 44 to move outward. The connecting plate 44 moves outward and drives the two positioning rods 51 to move outward. The connecting plate 44 moves outward and also causes the top plate 45 to move outward. The staff makes the top plate 45 abut against the side of the wall by moving the push column 48 outward.

[0049] The staff releases the push column 48, and the 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 to enter the inside of the clamping hole 49 on the support tube 12, thereby determining the position of the connecting plate 44 and the top plate 45. The staff puts the bolts into the inside of the fixing holes 46 on the top plate 45 to fix the pressure transmitter body 1. When the pipeline vibrates, the rubber shock-absorbing tube 10 will weaken the vibration and the pressure transmitter body 1 is fixed to the wall to prevent the vibration from being transmitted to the pressure transmitter body 1 and the measuring diaphragm 3 through the guide tube 5, and prevent the measurement result of the measuring diaphragm 3 from being affected by the vibration, thereby achieving the shock-absorbing effect on the pressure transmitter body 1 and further improving the measurement accuracy of the pressure transmitter body 1.

[0050] The bottom surface of the support tube 12 is provided with two slide grooves 52 for the positioning rod 51 to slide. A slider 53 is fixedly installed on the bottom surface of the positioning rod 51. The slider 53 is slidably connected with the slide groove 52. Both the slide groove 52 and the slider 53 are T-shaped structures to prevent the slider 53 from falling off from the slide groove 52 when the slider 53 slides inside the slide groove 52. The elastic member is a 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 force for the connecting plate 44.

[0051] Specifically, by means of the connecting plate 44, the connecting plate 44 moves outward inside the support tube 12 to drive the positioning rod 51 to move outward, and the positioning rod 51 moves outward to drive the slider 53 to slide outward inside the slide groove 52, and the slide groove 52 and the slider 53 cooperate to limit the movement of the positioning rod 51, thereby achieving a limiting effect on the positioning rod 51;

[0052] A support ring 23 is fixedly sleeved on the outer circular wall of the cooling tube 13, and a connecting column 22 is fixedly installed on the outer circular wall of the support ring 23. One side of the connecting column 22 is fixedly connected to the outer circular wall of the guide tube 5. The support ring 23 and the first valve 24 are arranged, and the support ring 23 and the first valve 24 can support the cooling tube 13 to improve the stability of the cooling tube 13.

[0053] Working principle: through the rubber shock-absorbing tube 10, the staff uses the flange to install the rubber shock-absorbing tube 10 on the pipeline, and the staff moves the push column 48 downward, and the push column 48 moves downward so that the connecting plate 44 moves downward in cooperation with the positioning rod 51, the movable ring 54 and the spring 55, and at the same time separates the clamping column 50 from the clamping hole 49. The staff drives the connecting plate 44 to move outward by moving the push column 48 until the top plate 45 abuts against the wall. The staff puts the bolts into the fixing holes 46 on the top plate 45, thereby fixing the pressure transmitter body 1 on the wall. The vibration of the pipeline will be weakened by the rubber shock-absorbing tube 10 and will not be transmitted to the pressure transmitter body 1 and the measuring diaphragm 3, reducing the impact of the vibration on the measuring diaphragm 3;

[0054] Secondly, the temperature measuring device 11 on the guide pipe 5 can measure the temperature of the hot water. When the temperature of the hot water is lower than the threshold, the hot water contacts the measuring diaphragm 3 through the guide pipe 5. When the temperature of the hot water exceeds the threshold, the hot water enters the cooling pipe 13 through the guide pipe 5. The cooling pipe 13 has a long path to reduce the temperature of the hot water. Then, the cooling oil in the heat dissipation tube 19 and the heat dissipation pipe 20 and the heat dissipation fin 21 cooperate to reduce the temperature of the hot water again, thereby preventing the measuring diaphragm 3 from contacting with the hot water with too high a temperature, and preventing the measuring diaphragm 3 from being damaged due to the overly high temperature of the hot water, thereby ensuring the accuracy of subsequent measurements.

[0055] Finally, after long-term use, scale will be formed on the inner walls of the guide pipe 5 and the cooling pipe 13, causing the inner diameters of the guide pipe 5 and the cooling pipe 13 to become smaller. The detergent inside the storage box 17 enters the interior of the support box 16 through the discharge valve 29. The staff uses the second electric push rod 30 to flip the baffle 34 upward, and the first electric push rod 28 starts to drive the push plate 37 to move forward to push the detergent into the connecting pipe 14. The water in the external pipeline enters the connecting pipe 14 through the water inlet pipe 15 and mixes with the detergent. The water and detergent are mixed to flush the guide pipe 5 and the cooling pipe 13 from the opposite direction to clean the scale on the inner walls of the guide pipe 5 and the cooling pipe 13 to prevent the scale from affecting the accuracy of the measurement.

[0056] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A piezoresistive pressure transmitter, characterized in that: include: A pressure transmitter body (1), wherein a mounting tube (2) is fixedly mounted on the outer circular wall surface of the pressure transmitter body (1), a measuring diaphragm (3) is fixedly sleeved on the inner circular wall surface of the mounting tube (2), a connecting cover (4) is threadedly connected to the outer circular wall surface of the mounting tube (2), a guide tube (5) for connecting to a pipeline is fixedly mounted on the bottom surface of the connecting cover (4), a sealing ring (18) is fixedly mounted on the inner circular wall surface of the connecting cover (4), a temperature measuring device (11) for measuring the temperature of hot water is fixedly mounted on the outer circular wall surface of the guide tube (5), an accurate measuring mechanism (6) for improving the measurement accuracy of the pressure transmitter body (1) is provided on the outer circular wall surface of the guide tube (5), and a shock absorbing mechanism (7) for absorbing the shock of the pressure transmitter body (1) is provided at one end of the pressure transmitter body (1).

2. A piezoresistive pressure transmitter according to claim 1, characterized in that: The accurate measuring mechanism (6) comprises a cooling tube (13), the cooling tube (13) being fixedly mounted on the outer circumferential wall surface of the guide tube (5), the lower half of the cooling tube (13) being bent downward, the outer circumferential wall surface of the cooling tube (13) being fixedly sleeved with a heat dissipation tube (19), the inner circumferential wall surface of the guide tube (5) being fixedly sleeved with two first valves (24), the interior of the heat dissipation tube (19) being filled with cooling oil, and the outer circumferential wall surface of the heat dissipation tube (19) being fixedly mounted with two valves for allowing the cooling oil to flow A movable heat dissipation pipe (20), the outer circular wall surface of the heat dissipation pipe (20) is fixedly sleeved with a plurality of heat dissipation fins (21), the outer circular wall surface of the guide pipe (5) is fixedly mounted with a connecting pipe (14), one end of the connecting pipe (14) is fixedly mounted with a supporting box (16), the outer circular wall surface of the supporting box (16) is fixedly mounted with a water inlet pipe (15) for water inlet, the interior of the supporting box (16) is slidably connected with a baffle (34), both sides of the supporting box (16) are provided with limiting holes (35), the limiting holes (35) A limiting block (38) is slidably connected inside the hole (35); a placement block (57) is fixedly installed on one side of the baffle (34); a connecting rod (26) is rotatably connected to one side of the limiting block (38); the other end of the connecting rod (26) is rotatably connected to the placement block (57); both sides of the inside of the support box (16) are rotatably connected to movable rods (41); a support block (40) is fixedly installed on one side of the baffle (34); one end of the movable rod (41) is rotatably connected to one side of the support block (40); The limiting block (38) is rotatably connected, a movable column (32) is fixedly mounted on the bottom surface of the limiting block (38), a transverse plate (31) is fixedly mounted on the bottom end of the movable column (32), a second electric push rod (30) for driving the movable column (32) to move is mounted on the bottom surface of the supporting box (16), a push plate (37) for pushing the cleaning agent forward is arranged on one side of the interior of the supporting box (16), and a first electric push rod (28) for driving the push plate (37) to move is mounted on one side of the supporting box (16).

3. A piezoresistive pressure transmitter according to claim 2, characterized in that: A storage box (17) for storing detergent is fixedly mounted on the top surface of the support box (16), a discharge valve (29) for dispensing detergent is fixedly mounted on the bottom surface of the storage box (17), and an electronic scale (36) for weighing detergent is fixedly mounted on the bottom surface of the support box (16).

4. A piezoresistive pressure transmitter according to claim 3, characterized in that: Both sides of the interior of the support box (16) are provided with limiting grooves (42) for the baffle (34) to slide, and both sides of the baffle (34) are fixedly installed with limiting columns (43), and the limiting columns (43) are slidably connected to the limiting grooves (42).

5. The piezoresistive pressure transmitter according to claim 2, characterized in that: A sewage valve (8) is fixedly mounted on the outer circular wall surface of the guide pipe (5), a sewage pipe (9) for sewage discharge is fixedly sleeved on the inner circular wall surface of the sewage valve (8), and the sewage valve (8) is electrically connected to the PLC controller.

6. The piezoresistive pressure transmitter according to claim 1, characterized in that: The shock absorbing mechanism (7) comprises a support tube (12), wherein the support tube (12) is fixedly mounted on one end of the pressure transmitter body (1), the support tube (12) is slidably connected to a connecting plate (44) inside, the inner bottom surface of the support tube (12) is slidably connected to two positioning rods (51), the positioning rods (51) penetrate the connecting plate (44), the outer circular wall surface of the positioning rods (51) is elastically connected to a movable ring (54) via an elastic member, two clamping columns (50) are fixedly mounted on the top surface of the connecting plate (44), the clamping columns (50) are movably clamped with the support tube (12), a rubber shock absorbing tube (10) is fixedly mounted on the bottom surface of the guide tube (5), a top plate (45) is fixedly mounted on one side of the connecting plate (44), and two fixing holes (46) are provided on one side of the top plate (45).

7. The piezoresistive pressure transmitter according to claim 6, characterized in that: The bottom surface of the support tube (12) is provided with two slide grooves (52) for the positioning rod (51) to slide, and a sliding block (53) is fixedly installed on the bottom surface of the positioning rod (51), and the sliding block (53) is slidably connected to the slide groove (52).

8. The piezoresistive pressure transmitter according to claim 2, characterized in that: A support ring (23) is fixedly sleeved on the outer circular wall surface of the cooling tube (13), a connecting column (22) is fixedly mounted on the outer circular wall surface of the support ring (23), and one side of the connecting column (22) is fixedly connected to the outer circular wall surface of the guide tube (5).

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