Pressure transmitter convenient to clean

Abstract

The invention belongs to the technical field of pressure measuring instruments, and particularly relates to a pressure transmitter convenient to clean, which comprises a pressure measuring tube and a control gauge outfit arranged above the pressure measuring tube, and further comprises a mounting seat, the mounting seat is detachably connected with the upper tube wall of the pressure measuring tube in an inserted manner, the mounting seat is provided with two detection heads, and the control gauge outfit is arranged on the pressure measuring tube. Pressure measuring holes are formed in the ends of the two detection heads, and pressure measuring mechanisms are installed at the positions, above the two pressure measuring holes, in the installation base. According to the invention, the self-cleaning work of the detection end of the pressure transmitter can be completed without shutdown, continuous monitoring of the medium pressure is not influenced, the starting time of the self-cleaning work can be adaptively regulated and controlled based on the resistance of medium conveying, the timeliness of the cleaning work is ensured, and meanwhile, the self-cleaning work can be continuously carried out during each cleaning. Performance detection is carried out on the pressure measuring element of the pressure transmitter, and personnel are reminded to maintain or replace the damaged pressure measuring element in time.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure measuring instruments, and in particular relates to a pressure transmitter that is easy to clean. Background Art

[0002] A pressure transmitter is an instrument that converts pressure signals into standard electrical signal outputs. It consists of a sensor, circuit, and housing. Pressure transmitters are crucial in industrial production. They can convert pressure signals into standard electrical signal outputs and are widely used in petrochemical, electric power, metallurgy and other fields. By accurately measuring pressure, they provide reliable data for monitoring and control of the production process, ensuring stable operation of the system.

[0003] At present, when the detection end of the pressure transmitter monitors the medium pressure, since the isolation diaphragm needs to be in direct contact with the medium, some of the medium may adhere to the isolation diaphragm, such as oil, pulp, etc., and these media may also block the pressure measuring hole. If it is not cleaned in time, it may affect the normal use of the pressure transmitter and cause a large deviation in the monitoring result. Therefore, it is necessary to clean the detection end of the pressure transmitter in time, such as a pressure transmitter that is easy to clean disclosed in patent announcement number CN215492155U; However, the cleaning component disclosed in the above patent only cleans the outer wall of the detection end of the pressure transmitter, and cannot clean the medium that may be blocked at the isolation diaphragm and the pressure measuring hole. The cleaning effect is poor, which may still cause the pressure transmitter to fail to work normally. Secondly, when cleaning the inside of the detection end of the pressure transmitter, it is necessary to suspend pressure monitoring, which affects the continuous monitoring of the medium pressure and has a poor use effect. Summary of the invention

[0004] The object of the present invention is to provide a pressure transmitter which is easy to clean in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solution: a pressure transmitter that is easy to clean, comprising a pressure measuring tube and a control meter head arranged above the pressure measuring tube, and further comprising: A mounting seat is detachably plugged with the upper tube wall of the pressure measuring tube, the mounting seat is provided with two detection heads, and the ends of the two detection heads are provided with pressure measuring holes, and the positions above the two pressure measuring holes in the interior of the mounting seat are provided with pressure measuring mechanisms; Two normally open solenoid valves are respectively installed inside the two pressure measuring holes, and the two normally open solenoid valves are electrically connected to the control meter head; A top seat is arranged above the mounting seat, a mounting hole matching the control meter head is opened on the side wall of the top seat, and the control meter head is installed inside the mounting hole, a liquid cavity is opened inside the top seat, and a flushing and cleaning unit is installed together with the liquid cavity and the mounting seat, and the liquid cavity is filled with a flushing agent; A liquid discharge unit is installed at the bottom of the pressure measuring tube, and the liquid discharge unit is connected with two pressure measuring holes; The starting unit is installed on the side wall of the top seat. After receiving the electrical signal output by the starting unit, the control meter controls the flushing and cleaning unit, the normally open solenoid valve and the drainage unit to work.

[0006] Preferably, the two pressure measuring mechanisms each include a pressure measuring cavity opened inside the mounting seat, and the pressure measuring cavity is connected to the pressure measuring hole on the same side, an isolation diaphragm is installed inside the pressure measuring cavity near one side of the pressure measuring hole, a detachable mounting block is installed on the top of the mounting seat, and a mounting groove is opened at the bottom of the mounting block, a pressure measuring assembly is installed inside the mounting groove, the interior of the pressure measuring cavity between the isolation diaphragm and the pressure measuring assembly is filled with silicone oil, the isolation diaphragm transmits the pressure on one side of the pressure measuring hole to the pressure measuring assembly through the silicone oil, and the pressure measuring assembly is electrically connected to the control meter head.

[0007] Preferably, the flushing and cleaning unit includes a T-shaped cavity opened inside the mounting seat, a liquid inlet pipe is fixedly inserted at the upper end of the side wall of the T-shaped cavity, and the liquid inlet pipe is connected with the interior of the liquid cavity, the T-shaped cavity and the two pressure measuring cavities are jointly provided with a flushing hole, and a first normally closed solenoid valve is installed inside the T-shaped cavity near the two flushing holes, the two first normally closed solenoid valves are electrically connected to the control head, and a push-pressure flushing assembly is installed inside the liquid cavity.

[0008] Preferably, the drainage unit includes a sealing cover fixedly installed on the lower tube wall of the pressure measuring tube, the hole walls of the two pressure measuring holes are provided with drainage holes at positions above the normally open solenoid valve on the same side, and a second normally closed solenoid valve is installed inside the two drainage holes, the side walls of the two detection heads are fixedly installed with drainage pipes connected to the drainage holes on the same side, and the two drainage pipes are connected to the sealing cover, and a drainage port is provided at the bottom of the sealing cover.

[0009] Preferably, the starting unit includes a mounting cover installed on the side wall of the top seat, a fan is installed inside the mounting cover, a spotlight is fixedly installed on the inner wall of the mounting cover, a photoelectric switch corresponding to the position of the spotlight is fixedly installed on the side wall of the top seat, and a pulse counter is installed on the side wall of the top seat, the blades of the fan are arranged between the spotlight and the photoelectric switch, and the light emitted by the spotlight passes through the gaps between the blades of the fan to irradiate the photosensitive end of the photoelectric switch, the photoelectric switch is electrically connected to the pulse counter, and the pulse counter, the spotlight and the fan are all electrically connected to the control meter head, a plurality of air inlet holes are opened on the side wall of the mounting cover, a heat dissipation assembly connected to the mounting cover is provided inside the top seat, and a resistance adjustment assembly is installed at the bottom of the mounting seat between the two detection heads.

[0010] Preferably, the push-flushing assembly includes a piston plate slidably arranged inside the liquid cavity, the top seat is equipped with a motor drive assembly, and the motor drive assembly is used to drive the piston plate to move up and down, a first flexible sealing sleeve is fixedly installed between the upper and lower ends of the piston plate and the liquid cavity, and the driving end of the motor drive assembly is arranged on the inner side of the two first flexible sealing sleeves, the motor drive assembly is electrically connected to the control head, a pressure switch is installed on the lower cavity wall of the liquid cavity at a position located inside the first flexible sealing sleeve, and the moving contact of the pressure switch is equipped with a touch plate, and the pressure switch is electrically connected to the control head.

[0011] Preferably, the heat dissipation assembly includes an air inlet cavity and an air outlet cavity opened inside the top seat, and the air inlet cavity and the air outlet cavity are respectively arranged on both sides of the mounting hole, the cavity walls on the opposite sides of the air inlet cavity and the air outlet cavity are provided with ventilation holes, and the mounting cover is connected to the ventilation holes on the same side, the upper cavity walls of the air inlet cavity and the air outlet cavity are fixedly connected with a plurality of heat dissipation pipes, and the lower cavity wall of the liquid cavity is fixedly connected with an arc-shaped heat-conducting aluminum plate.

[0012] Preferably, the resistance adjustment assembly includes an arc-shaped groove opened at the bottom of the mounting seat, an insulating baffle is hinged inside the arc-shaped groove, a square hole is opened on the side wall of the insulating baffle, and a removable mesh plate is installed inside the square hole, a conductive rod is installed on the top of the insulating baffle, an arc-shaped insulating pad is fixedly installed on the groove wall of the arc-shaped groove, and an arc-shaped resistor bar is fixedly installed on the inner wall of the arc-shaped insulating pad, the conductive rod is in sliding contact with the inner wall of the arc-shaped resistor bar, and the conductive rod and the arc-shaped resistor bar are electrically connected to the fan, a second flexible sealing sleeve is fixedly provided between the side wall of the insulating baffle and the bottom of the mounting seat, and the arc-shaped groove is arranged on the inner side of the second flexible sealing sleeve.

[0013] Preferably, a low-position electromagnetic switch and a high-position electromagnetic switch are fixedly mounted on the upper cavity wall of the liquid cavity, and the low-position electromagnetic switch and the high-position electromagnetic switch are electrically connected to the two pressure measuring components through a control meter.

[0014] Compared with the existing technology, the advantages of an easy-to-clean pressure transmitter are: 1. Through the cooperation of the pressure measuring tube, control gauge, mounting seat, detection head, pressure measuring hole and pressure measuring mechanism, the pressure of the medium in the pipeline can be monitored online, and the pressure can be converted into a standard electrical signal output. The redundant design of the double detection head can perform pressure measurement alternately. In conjunction with the top seat, liquid cavity, flushing and cleaning unit and drainage unit, the isolation diaphragm and the inside of the pressure measuring hole can be cleaned without stopping the machine, ensuring continuous monitoring of the medium pressure.

[0015] 2. Through the setting of the starting unit, the cleaning work of the detection heads can be automatically started based on the working time of the two detection heads, without manual control. In addition, in conjunction with the setting of the resistance adjustment component, the starting timing of the detection head cleaning work can be adaptively adjusted based on the resistance of the medium conveying, thereby ensuring the timeliness of the detection head cleaning.

[0016] 3. Through the heat dissipation component, the fan of the starting unit can be used in conjunction with the flushing agent inside the liquid cavity to assist in heat dissipation and cooling at the control head to maintain the stability of the control head. Through the low-position electromagnetic switch and high-position electromagnetic switch, it can automatically determine whether the pressure measurement performance at the detection head is stable each time cleaning is performed, and remind personnel to repair the damaged pressure measurement structure in time to ensure the accuracy of the pressure measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a pressure transmitter that is easy to clean provided by the present invention; Figure 2 It is a schematic diagram of the internal structure of a pressure measuring tube of a pressure transmitter that is easy to clean provided by the present invention; Figure 3 It is a schematic diagram of the internal structure of a top seat of a pressure transmitter that is easy to clean provided by the present invention; Figure 4 The present invention provides a pressure transmitter that is easy to clean. Figure 2 A magnified view of the structure of part A; Figure 5 The present invention provides a pressure transmitter that is easy to clean. Figure 3 A magnified view of the structure of part B; Figure 6 The present invention is a schematic diagram of the three-dimensional structure of an insulating baffle of a pressure transmitter that is easy to clean.

[0018] In the figure: 1 pressure measuring tube, 2 control meter head, 3 mounting seat, 4 detection head, 5 pressure measuring hole, 6 pressure measuring mechanism, 61 pressure measuring cavity, 62 isolation diaphragm, 63 mounting block, 64 mounting groove, 65 pressure measuring assembly, 7 normally open solenoid valve, 8 top seat, 9 mounting hole, 10 liquid cavity, 11 flushing and cleaning unit, 111 T-shaped cavity, 112 liquid inlet pipe, 113 flushing hole, 114 first normally closed solenoid valve, 12 drainage unit, 121 sealing cover, 122 drainage hole, 123 second normally closed solenoid valve, 124 drainage pipe, 125 drainage port, 13 starting unit, 131 mounting cover, 132 fan, 133 spotlight, 134 Photoelectric switch, 135 pulse counter, 136 air inlet, 14 push-and-wash assembly, 141 piston plate, 142 motor drive assembly, 143 first flexible sealing sleeve, 144 pressure switch, 145 touch-pressure plate, 15 heat dissipation assembly, 151 air inlet cavity, 152 air outlet cavity, 153 ventilation hole, 154 heat dissipation pipe, 155 arc-shaped heat-conducting aluminum plate, 16 resistance adjustment assembly, 161 arc-shaped groove, 162 insulating baffle, 163 square hole, 164 mesh plate, 165 conductive rod, 166 arc-shaped insulating pad, 167 arc-shaped resistor strip, 168 second flexible sealing sleeve, 17 low-position electromagnetic switch, 18 high-position electromagnetic switch. Implementation

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

[0020] like Figure 1-Figure 6 As shown, a pressure transmitter that is easy to clean includes a pressure measuring tube 1 and a control meter head 2 arranged above the pressure measuring tube 1, and also includes: a mounting seat 3, the mounting seat 3 is detachably plugged with the upper tube wall of the pressure measuring tube 1, the mounting seat 3 is provided with two detection heads 4, and the ends of the two detection heads 4 are both provided with pressure measuring holes 5, and the inside of the mounting seat 3 is provided with pressure measuring mechanisms 6 located above the two pressure measuring holes 5, and the two pressure measuring mechanisms 6 include pressure measuring cavities 61 opened in the mounting seat 3, and the pressure measuring cavities 61 are opposite to the pressure measuring holes 5 on the same side. The pressure measuring chamber 61 is connected, an isolating diaphragm 62 is installed at a position near the pressure measuring hole 5 on one side, a detachable mounting block 63 is installed on the top of the mounting seat 3, and a mounting groove 64 is provided at the bottom of the mounting block 63, a pressure measuring assembly 65 is installed inside the mounting groove 64, and the interior of the pressure measuring chamber 61 between the isolating diaphragm 62 and the pressure measuring assembly 65 is filled with silicone oil, the isolating diaphragm 62 transmits the pressure on one side of the pressure measuring hole 5 to the pressure measuring assembly 65 through the silicone oil, and the pressure measuring assembly 65 is electrically connected to the control meter head 2.

[0021] Two normally open solenoid valves 7 are respectively installed inside the two pressure measuring holes 5, and the two normally open solenoid valves 7 are electrically connected to the control head 2. The top seat 8 is arranged above the mounting seat 3. The side wall of the top seat 8 is provided with a mounting hole 9 matching the control head 2, and the control head 2 is installed inside the mounting hole 9. A liquid cavity 10 is opened inside the top seat 8, and the liquid cavity 10 and the mounting seat 3 are jointly installed with a flushing cleaning unit 11. The interior of the liquid cavity 10 is filled with a flushing agent. The flushing cleaning unit 11 includes a flushing agent opened at A T-shaped cavity 111 is mounted inside the seat 3, a liquid inlet pipe 112 is fixedly inserted at the upper end of the side wall of the T-shaped cavity 111, and the liquid inlet pipe 112 is communicated with the interior of the liquid cavity 10, the T-shaped cavity 111 and the two pressure measuring cavities 61 are both provided with a flushing hole 113, and a first normally closed solenoid valve 114 is installed inside the T-shaped cavity 111 near the two flushing holes 113, the two first normally closed solenoid valves 114 are electrically connected to the control meter head 2, and a push-flushing assembly 14 is installed inside the liquid cavity 10.

[0022] The drainage unit 12 is installed at the bottom of the pressure measuring tube 1, and the drainage unit 12 is connected to the two pressure measuring holes 5. The drainage unit 12 includes a sealing cover 121 fixedly installed on the lower tube wall of the pressure measuring tube 1. The hole walls of the two pressure measuring holes 5 are located above the normally open solenoid valve 7 on the same side and are provided with drainage holes 122, and the interiors of the two drainage holes 122 are both installed with second normally closed solenoid valves 123. The side walls of the two detection heads 4 are fixedly installed with drainage pipes 124 connected to the drainage holes 122 on the same side, and the two drainage pipes 124 are both connected to the sealing cover 121. A drainage port 125 is provided at the bottom of the sealing cover 121, and a container for receiving liquid can be installed at the end of the drainage port 125 to prevent waste liquid from polluting the ground.

[0023] The starting unit 13 is installed on the side wall of the top seat 8. After the control meter head 2 receives the electrical signal output by the starting unit 13, it controls the flushing and cleaning unit 11, the normally open solenoid valve 7 and the drain unit 12 to work. The starting unit 13 includes a mounting cover 131 installed on the side wall of the top seat 8. A fan 132 is installed inside the mounting cover 131. A spotlight 133 is fixedly installed on the inner wall of the mounting cover 131. A photoelectric switch 134 corresponding to the position of the spotlight 133 is fixedly installed on the side wall of the top seat 8. A pulse counter 135 is installed on the side wall of the top seat 8. The blades of the fan 132 are arranged between the spotlight 133 and the photoelectric switch 134. The spotlight 133 emits a pulse. The emitted light passes through the gaps between the blades of the fan 132 and irradiates the photosensitive end of the photoelectric switch 134. The photoelectric switch 134 is electrically connected to the pulse counter 135. The pulse counter 135, the spotlight 133 and the fan 132 are all electrically connected to the control head 2. A plurality of air inlet holes 136 are provided on the side wall of the mounting cover 131. A heat dissipation component 15 connected to the mounting cover 131 is provided inside the top seat 8. A resistance adjustment component 16 is installed at the bottom of the mounting seat 3 between the two detection heads 4. The pulse counter 135 can count based on the received pulse electrical signal and output an electrical signal to the control head 2 after the count reaches a set value.

[0024] The push-flushing assembly 14 includes a piston plate 141 slidably arranged inside the liquid chamber 10, a motor drive assembly 142 is installed on the top seat 8, and the motor drive assembly 142 is used to drive the piston plate 141 to move up and down, and a first flexible sealing sleeve 143 is fixedly installed between the upper and lower ends of the piston plate 141 and the liquid chamber 10, and the driving end of the motor drive assembly 142 is arranged on the inner side of the two first flexible sealing sleeves 143, and the motor drive assembly 142 is electrically connected to the control head 2, and a pressure is installed at the position of the lower cavity wall of the liquid chamber 10 located inside the first flexible sealing sleeve 143. The pressure switch 144 is electrically connected to the control meter 2. The motor drive assembly 142 includes a guide rod, a screw, a nut, a motor, a bearing and other components. The motor drives the screw to rotate, and cooperates with the nut to drive the piston plate 141 to move up and down. When the piston plate 141 squeezes and closes the moving contact of the pressure switch 144, the control meter 2 will remind the personnel to add cleaning agent to the liquid chamber 10 through its own alarm module. A liquid replenishing port is left on the side wall of the liquid chamber 10, and a sealing cover is provided at the liquid replenishing port.

[0025] The heat dissipation assembly 15 includes an air inlet cavity 151 and an air outlet cavity 152 opened inside the top seat 8, and the air inlet cavity 151 and the air outlet cavity 152 are respectively arranged on both sides of the mounting hole 9, and the cavity walls on the opposite sides of the air inlet cavity 151 and the air outlet cavity 152 are provided with ventilation holes 153, and the mounting cover 131 is connected to the ventilation holes 153 on the same side, and the upper cavity walls of the air inlet cavity 151 and the air outlet cavity 152 are fixedly connected with a plurality of heat dissipation pipes 154, and the lower cavity wall of the liquid cavity 10 is fixedly connected with an arc-shaped heat-conducting aluminum plate 155, through which the heat of the control head 2 during operation can be transferred to the flushing agent.

[0026] The resistance adjustment component 16 includes an arc-shaped groove 161 opened at the bottom of the mounting seat 3, an insulating baffle 162 is hinged inside the arc-shaped groove 161, a square hole 163 is opened on the side wall of the insulating baffle 162, and a detachable mesh plate 164 is installed inside the square hole 163, a conductive rod 165 is installed on the top of the insulating baffle 162, an arc-shaped insulating pad 166 is fixedly installed on the groove wall of the arc-shaped groove 161, and an arc-shaped resistor bar 167 is fixedly installed on the inner wall of the arc-shaped insulating pad 166, the conductive rod 165 is in sliding contact with the inner wall of the arc-shaped resistor bar 167, and the conductive rod 165 and the arc-shaped resistor bar 167 are electrically connected to the fan 132, a second flexible sealing sleeve 168 is fixedly provided between the side wall of the insulating baffle 162 and the bottom of the mounting seat 3, the arc-shaped groove 161 is arranged on the inner side of the second flexible sealing sleeve 168, and the second flexible sealing sleeve 168 can prevent the medium from contacting the conductive rod 165 and the arc-shaped resistor bar 167.

[0027] A low-position electromagnetic switch 17 and a high-position electromagnetic switch 18 are fixedly installed on the upper cavity wall of the liquid cavity 10. The low-position electromagnetic switch 17 and the high-position electromagnetic switch 18 are electrically connected to the two pressure measuring components 65 through the control header 2. When the control header 2 only receives the electrical signal of the low-position electromagnetic switch 17 being closed, it means that the pressure measuring component 65 and the isolation diaphragm 62 do not need maintenance or replacement. Otherwise, the pressure measuring component 65 and the isolation diaphragm 62 need to be replaced.

[0028] The operating principle of the present invention is described as follows: Install the pressure measuring tube 1 into the pipeline to be measured (refer to Figure 2 , Figure 2 The dotted line in the middle is the medium flow direction), connect the control meter head 2 to the external power supply circuit, and then start the control meter head 2; After the control meter 2 is started, the control meter 2 will immediately control the normally open solenoid valve 7 in the pressure measuring hole 5 on the right to be energized and closed. When the medium enters the pressure measuring tube 1 through the external pipeline, the medium pressure will be transmitted to the isolation diaphragm 62 on the same side (that is, the isolation diaphragm 62 at the normally open solenoid valve 7 on the left side that is not energized) through the pressure measuring hole 5. The isolation diaphragm 62 will be deformed by the pressure, thereby squeezing the silicone oil. The silicone oil will transmit the pressure to the pressure measuring component 65. The pressure measuring component 65 will output an electric signal of corresponding strength to the control meter 2. The control meter 2 will process and amplify the electric signal, and convert it into a standard electric signal (for example, a 4-20mA current signal) and output it to the corresponding terminal device. The terminal device will perform corresponding actions according to the strength of the electric signal (for example, when the electric signal is lower than the threshold set by the terminal device, it indicates that the medium may leak. At this time, the terminal device immediately executes corresponding measures). At the same time, the control meter 2 converts the electric signal into an analog value and displays it through its own display screen. On-site personnel can view the pressure of the medium in real time through the display screen of the control meter 2. After the control meter 2 is started, the fan 132 will be controlled to work synchronously. The fan 132 can inhale the external airflow through the air inlet 136, and discharge the airflow through the ventilation hole 153, the air inlet cavity 151, the air outlet cavity 152 and the heat dissipation pipe 154. The heat generated by the control meter 2 during operation will be heat-exchanged with the flushing agent inside the liquid cavity 10 through the arc-shaped heat-conducting aluminum plate 155. When the hot air flows through the heat dissipation pipe 154, the excess heat in the flushing agent can be taken away, thereby assisting the control meter 2 in heat dissipation and cooling, and assisting in improving the working stability of the control meter 2. Secondly, when the fan 132 rotates, each blade of the fan 132 will successively block the light from the spotlight 133 to the photoelectric switch 134 during the rotation process, and when the gap between each blade passes through the spotlight 133, the light emitted by the spotlight 133 will irradiate the photoelectric switch 134. At this time, the photoelectric switch 134 will convert the optical signal into an electrical signal and output it to the pulse counter 135. The pulse counter 135 will immediately increase the count once. When the count reaches the set value (the set value can be set according to the medium being transported. For example, when the medium being transported is oil, since oil is relatively viscous and is easy to contaminate the isolation diaphragm 62 and block the pressure measuring hole 5, the set value should be smaller, for example, the set value is 1000. On the contrary, when transporting relatively pure gas, the set value can be increased), the pulse counter 135 will output an electrical signal to the control header 2, and the control header 2 will immediately start the self-cleaning work; Among them, if there are more impurities in the medium, or the medium is relatively viscous (such as oil and other media), when the medium flows through the mesh plate 164, the flow resistance imposed by the medium on the mesh plate 164 is greater, and at this time, the deflection angle of the insulating baffle 162 also becomes larger synchronously. On the contrary, if there are fewer impurities in the medium, or the viscosity of the medium is relatively low (such as natural gas), when the medium passes through the mesh plate 164, the deflection angle of the insulating baffle 162 is smaller. When the deflection angle of the insulating baffle 162 is smaller, the length of the arc-shaped resistor bar 167 connected to the connection loop between the conductive rod 165 and the fan 132 is longer. At this time, the fan 132 is connected to the conductive rod 165. The internal current is small, so the fan 132 rotates slowly. At this time, the frequency of the photoelectric switch 134 receiving the irradiation of the spotlight 133 is slow. When the insulating baffle 162 is deflected at a large angle, the frequency of the photoelectric switch 134 receiving the irradiation of the spotlight 133 is high. Therefore, when the impurities of the transported medium are small or the viscosity of the medium is low (the possibility of the medium contaminating the isolation diaphragm 62 or clogging the pressure measuring hole 5 is reduced), the counting speed of the pulse counter 135 increases slowly, thereby extending the interval time of starting the self-cleaning work. On the contrary, the interval time of starting the self-cleaning work is shortened to ensure the timeliness of starting the self-cleaning work. When the self-cleaning operation is started, the control meter head 2 will control the normally open solenoid valve 7 (i.e. the normally open solenoid valve 7 on the right side mentioned above) that is energized to be immediately de-energized, and synchronously control the normally open solenoid valve 7 that is not energized to be immediately energized. At this time, the medium pressure can continue to be monitored through another pressure measuring hole 5, the isolation diaphragm 62, the silicone oil and the pressure measuring component 65 to ensure continuous monitoring of the medium pressure. At the same time, the control meter head 2 will control the first normally closed solenoid valve 114 on the same side of the normally open solenoid valve 7 that is energized at this time to be energized and opened, and control the second normally closed solenoid valve 123 on this side to be energized and opened. Then, the control meter head 2 controls the motor drive component 142 to work regularly for 10 seconds, and the motor drive component 142 can drive the piston The plate 141 moves down a certain distance, and when the piston plate 141 moves down, it will squeeze the flushing agent inside the liquid chamber 10. At this time, the flushing agent will enter the T-shaped cavity 111 through the liquid inlet pipe 112, and enter the pressure measuring cavity 61 on this side through the flushing hole 113 at the first normally closed solenoid valve 114 that is powered on. When the flushing agent flows through the isolation diaphragm 62 and the pressure measuring hole 5, it can discharge the impurities that may be attached to the surface of the isolation diaphragm 62 and the impurities inside the pressure measuring hole 5 into the drain pipe 124, and finally discharge through the drain port 125 at the bottom of the sealing cover 121 (a container for receiving liquid can be installed at the drain port 125 to prevent the discharged liquid from contaminating the ground). When the motor drive component 142 works regularly 9.5 seconds, the control meter head 2 will control the second normally closed solenoid valve 123 to shut off and close, and keep the first normally closed solenoid valve 114 and the normally open solenoid valve 7 on this side powered on. At this time, the flushing agent squeezed by the piston plate 141 cannot be discharged through the drain hole 122, so the hydraulic pressure inside the pressure measuring hole 5 increases, which will cause the isolation diaphragm 62 on this side to deform, and then the pressure measuring component 65 on this side will detect the pressure. After the timing work of the motor drive component 142 is completed, the control meter head 2 will process and amplify the electrical signal output by the pressure measuring component 65 on this side and pass it to the low-level electromagnetic switch 17 and the high-level electromagnetic switch 18. When the isolation diaphragm 62 or the pressure measuring component 65 is damaged, the pressure detection accuracy of the pressure measuring component 65 decreases. At this time, the current passed to the low-level electromagnetic switch 17 and the high-level electromagnetic switch 18 will be less than or greater than the preset value (for example, 10-15mA). For example, when the electrical signal output by the pressure measuring component 65 to the control meter head 2 is too small compared to the preset value, it is passed The current in the low electromagnetic switch 17 and the high electromagnetic switch 18 is small. At this time, the moving contacts of the low electromagnetic switch 17 and the high electromagnetic switch 18 will not be closed, so the control head 2 cannot receive the closing electrical signal of the low electromagnetic switch 17 and the high electromagnetic switch 18. On the contrary, when the electrical signal output by the pressure measuring component 65 to the control head 2 is too large compared with the preset value, the current passed into the low electromagnetic switch 17 and the high electromagnetic switch 18 is too large. At this time, the low electromagnetic switch 17 and the high electromagnetic switch 18 will output electrical signals to the control head 2 at the same time. When the control head 2 does not receive the electrical signals of the low electromagnetic switch 17 and the high electromagnetic switch 18, or when the control head 2 receives the electrical signals of the low electromagnetic switch 17 and the high electromagnetic switch 18 at the same time, the control head 2 will immediately issue an alarm prompt through its own alarm module (such as a buzzer) to remind personnel that the pressure measuring component 65 or the isolation diaphragm 62 on this side is damaged and needs maintenance or replacement;. When the motor drive component 142 finishes its timing work, the control head 2 only receives the closing electrical signal of the low-position electromagnetic switch 17, but does not receive the closing electrical signal of the high-position electromagnetic switch 18. This indicates that the pressure measuring performance of the pressure measuring component 65 and the isolation diaphragm 62 on this side is normal and no maintenance or replacement is required and they can continue to be used. At this time, the control head 2 will control the first normally closed solenoid valve 114 on this side to cut off the power, and control the normally open solenoid valve 7 on this side to remain energized until the control head 2 receives the electrical signal output by the pulse counter 135 again (each time the pulse counter 135 outputs an electrical signal to the control head 2, the control head 2 will control the counting information of the pulse counter 135 to be reset to zero and count again).

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure transmitter that is easy to clean, comprising a pressure measuring tube (1) and a control meter head (2) arranged above the pressure measuring tube (1), characterized in that: Also includes: The mounting seat (3) is detachably plugged into the upper tube wall of the pressure measuring tube (1); the mounting seat (3) is provided with two detection heads (4), and the ends of the two detection heads (4) are provided with pressure measuring holes (5); the interior of the mounting seat (3) is provided with a pressure measuring mechanism (6) located above the two pressure measuring holes (5); two normally open solenoid valves (7) are respectively installed inside the two pressure measuring holes (5), and the two normally open solenoid valves (7) are electrically connected to the control meter head (2); a top seat (8) is arranged above the mounting seat (3), and a side wall of the top seat (8) is provided with a mounting hole (9) matching the control meter head (2), and the control meter head (2) is electrically connected to the control meter head (2). The meter head (2) is installed inside the mounting hole (9); a liquid cavity (10) is provided inside the top seat (8); and a flushing and cleaning unit (11) is installed together with the liquid cavity (10) and the mounting seat (3); the liquid cavity (10) is filled with a flushing agent; a liquid discharge unit (12) is installed at the bottom of the pressure measuring tube (1), and the liquid discharge unit (12) is connected to the two pressure measuring holes (5); and a starting unit (13) is installed on the side wall of the top seat (8); after the control meter head (2) receives the electrical signal output by the starting unit (13), it controls the flushing and cleaning unit (11), the normally open solenoid valve (7) and the liquid discharge unit (12) to work.

2. The easy-to-clean pressure transmitter according to claim 1, characterized in that: The two pressure measuring mechanisms (6) each comprise a pressure measuring cavity (61) provided inside the mounting seat (3), and the pressure measuring cavity (61) is connected to the pressure measuring hole (5) on the same side; an isolation diaphragm (62) is installed inside the pressure measuring cavity (61) at a position close to one side of the pressure measuring hole (5); a detachable mounting block (63) is installed on the top of the mounting seat (3), and a mounting groove (64) is provided at the bottom of the mounting block (63); a pressure measuring assembly (65) is installed inside the mounting groove (64); a position inside the pressure measuring cavity (61) located between the isolation diaphragm (62) and the pressure measuring assembly (65) is filled with silicone oil; the isolation diaphragm (62) transmits the pressure on one side of the pressure measuring hole (5) to the pressure measuring assembly (65) through the silicone oil; and the pressure measuring assembly (65) is electrically connected to the control meter head (2).

3. The easy-to-clean pressure transmitter according to claim 2, characterized in that: The flushing and cleaning unit (11) comprises a T-shaped cavity (111) provided inside the mounting seat (3); a liquid inlet pipe (112) is fixedly plugged into the upper end of the side wall of the T-shaped cavity (111), and the liquid inlet pipe (112) is connected to the interior of the liquid cavity (10); the T-shaped cavity (111) and the two pressure measuring cavities (61) are both provided with a flushing hole (113); a first normally closed solenoid valve (114) is installed in the interior of the T-shaped cavity (111) near the two flushing holes (113); the two first normally closed solenoid valves (114) are both electrically connected to the control meter head (2); and a push flushing assembly (14) is installed in the interior of the liquid cavity (10).

4. The easy-to-clean pressure transmitter according to claim 1, characterized in that: The drainage unit (12) comprises a sealing cover (121) fixedly mounted on the lower tube wall of the pressure measuring tube (1); drainage holes (122) are provided on the hole walls of the two pressure measuring holes (5) at positions above the normally open solenoid valve (7) on the same side, and a second normally closed solenoid valve (123) is installed inside the two drainage holes (122); drainage pipes (124) connected to the drainage holes (122) on the same side are fixedly mounted on the side walls of the two detection heads (4), and the two drainage pipes (124) are connected to the sealing cover (121); and a drainage port (125) is provided at the bottom of the sealing cover (121).

5. The easy-to-clean pressure transmitter according to claim 1, characterized in that: The starting unit (13) comprises a mounting cover (131) mounted on a side wall of a top seat (8), a fan (132) being mounted inside the mounting cover (131), a spotlight (133) being fixedly mounted on the inner wall of the mounting cover (131), a photoelectric switch (134) corresponding to the position of the spotlight (133) being fixedly mounted on the side wall of the top seat (8), and a pulse counter (135) being mounted on the side wall of the top seat (8), the blades of the fan (132) being arranged between the spotlight (133) and the photoelectric switch (134), and the light emitted by the spotlight (133) passing through the fan ( The gaps between the fan blades of the fan (132) are irradiated to the photosensitive end of the photoelectric switch (134), the photoelectric switch (134) is electrically connected to the pulse counter (135), the pulse counter (135), the spotlight (133) and the fan (132) are all electrically connected to the control meter (2), the side wall of the mounting cover (131) is provided with a plurality of air inlet holes (136), the interior of the top seat (8) is provided with a heat dissipation component (15) connected to the mounting cover (131), and the bottom of the mounting seat (3) is located between the two detection heads (4) and is provided with a resistance adjustment component (16).

6. The easy-to-clean pressure transmitter according to claim 3, characterized in that: The push-flushing assembly (14) comprises a piston plate (141) slidably arranged inside the liquid chamber (10); the top seat (8) is equipped with a motor drive assembly (142), and the motor drive assembly (142) is used to drive the piston plate (141) to move up and down; first flexible sealing sleeves (143) are fixedly installed between the upper and lower ends of the piston plate (141) and the liquid chamber (10), and the driving end of the motor drive assembly (142) is arranged on the inner sides of the two first flexible sealing sleeves (143); the motor drive assembly (142) is electrically connected to the control meter head (2); a pressure switch (144) is installed at a position on the lower cavity wall of the liquid chamber (10) located inside the first flexible sealing sleeve (143), and a moving contact of the pressure switch (144) is equipped with a touch plate (145); and the pressure switch (144) is electrically connected to the control meter head (2).

7. The easy-to-clean pressure transmitter according to claim 5, characterized in that: The heat dissipation assembly (15) comprises an air inlet cavity (151) and an air outlet cavity (152) which are opened inside the top seat (8), and the air inlet cavity (151) and the air outlet cavity (152) are respectively arranged on both sides of the mounting hole (9), the cavity walls on the opposite sides of the air inlet cavity (151) and the air outlet cavity (152) are both provided with ventilation holes (153), and the mounting cover (131) is connected to the ventilation holes (153) on the same side, the upper cavity walls of the air inlet cavity (151) and the air outlet cavity (152) are fixedly connected with a plurality of heat dissipation pipes (154), and the lower cavity wall of the liquid cavity (10) is fixedly plugged with an arc-shaped heat-conducting aluminum plate (155).

8. The easy-to-clean pressure transmitter according to claim 5, characterized in that: The resistance adjustment component (16) comprises an arc-shaped groove (161) formed at the bottom of the mounting seat (3); an insulating baffle (162) is hingedly connected to the inside of the arc-shaped groove (161); a square hole (163) is formed on the side wall of the insulating baffle (162); a detachable mesh plate (164) is installed inside the square hole (163); a conductive rod (165) is installed on the top of the insulating baffle (162); and an arc-shaped insulating pad (166) is fixedly installed on the groove wall of the arc-shaped groove (161). , and an arc-shaped resistor bar (167) is fixedly mounted on the inner wall of the arc-shaped insulating pad (166), the conductive rod (165) is in sliding contact with the inner wall of the arc-shaped resistor bar (167), and the conductive rod (165) and the arc-shaped resistor bar (167) are electrically connected to the fan (132), a second flexible sealing sleeve (168) is fixedly mounted between the side wall of the insulating baffle (162) and the bottom of the mounting seat (3), and the arc-shaped groove (161) is arranged on the inner side of the second flexible sealing sleeve (168).

9. The easy-to-clean pressure transmitter according to claim 2, characterized in that: A low-position electromagnetic switch (17) and a high-position electromagnetic switch (18) are fixedly mounted on the upper cavity wall of the liquid cavity (10), and the low-position electromagnetic switch (17) and the high-position electromagnetic switch (18) are both electrically connected to two pressure measuring assemblies (65) via a control meter (2).

Images