Anti-blocking pressure transmitter

Abstract

The invention belongs to the technical field of pressure transmitters, and particularly relates to an anti-blocking pressure transmitter, which comprises a pressure transmitter main body, the detection end of the pressure transmitter main body is in sealed threaded connection with a hollow round shell, and the center of the upper surface of the hollow round shell is provided with a connecting thread matched with the bottom end of the pressure transmitter main body. The inner wall of the hollow round shell is fixedly connected with a sealing rubber layer. The pressure transmitter has the functions of preventing accumulation and blockage of medium impurities and freezing and blockage, meanwhile, the protection capability of the pressure transmitter can be effectively improved, the display screen of the pressure transmitter has the dustproof and anti-freezing functions, the pressure transmitter further has the function of automatically cleaning the accumulated medium impurities, and the pressure transmitter is convenient to use. The working continuity and reliability of the pressure transmitter can be effectively improved, the accuracy of the pressure transmitter for detecting the pressure of the fluid medium is improved, and the maintenance convenience of the pressure transmitter can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure transmitters, and in particular relates to an anti-blocking type pressure transmitter. Background Art

[0002] A pressure transmitter is an instrument that can convert pressure signals into standard electrical signals for output. It senses pressure changes through a pressure sensor and outputs a stable electrical signal after processing. For example, the patent authorization announcement number is CN211626790U, which discloses a pressure transmitter. Pressure transmitters are widely used in many fields, such as in industrial production, such as petrochemicals, electric power and other industries, to monitor the pressure in pipelines and containers to ensure production safety and stable operation.

[0003] The pressure transmitter may be clogged during use due to excessive medium impurities, harsh environment or improper installation. Medium impurities such as solid particles, sediments or viscous substances will accumulate at the pressure tapping port. These medium impurities will cause adverse consequences after clogging, not only causing measurement errors of the pressure transmitter, but also damaging the internal sensor and circuit of the transmitter, causing system failures and affecting the reliability of the pressure transmitter. In addition, during the use of the pressure transmitter, if it is in a low-temperature environment and the fluid medium in contact with the pressure contains water, the water will condense into ice at low temperatures. As the amount of ice in the pressure transmitter gradually increases, the pressure transmitter will become blocked, which will further affect the accuracy of the pressure detection data of the pressure transmitter and also reduce the reliability of the use of the pressure transmitter.

[0004] To this end, we propose an anti-blocking pressure transmitter to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an anti-blocking pressure transmitter in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an anti-blocking pressure transmitter, comprising a pressure transmitter body, the detection end of the pressure transmitter body is sealedly threadedly connected with a hollow round shell, the center of the upper surface of the hollow round shell is provided with a connecting thread matched with the bottom end of the pressure transmitter body, the inner wall of the hollow round shell is fixedly connected with a sealing rubber layer, the inner wall of the sealing rubber layer is sealedly connected with a rotating block, the side wall of the rotating block is provided with a medium through hole, the upper surface of the rotating block is provided with a detection through hole matched with the bottom end of the pressure transmitter body, and the hole wall of the detection through hole is fixedly embedded with a sealing ring, the outer wall of the detection end of the pressure transmitter body is provided with a sealing groove matched with the sealing ring, the detection through hole is vertically connected with the cavity of the medium through hole, and the lower surface of the hollow round shell is fixedly connected with an anti-blocking mechanism; The outer walls on both sides of the hollow circular shell are fixedly connected with connecting pipes with the same aperture as the medium through hole, the connecting pipe is fixedly connected with a fixing flange on the side away from the hollow circular shell, and the opposite sides of the two fixing flanges are commonly fixedly connected with a heat-insulating sealing cover, and the inner wall of the heat-insulating sealing cover is fixedly connected with an anti-freezing mechanism.

[0007] In the above-mentioned anti-blocking pressure transmitter, the anti-blocking mechanism includes a connecting frame fixedly connected to the lower surface of the hollow circular shell, the bottom end of the connecting frame is fixedly connected to a micro servo motor, the lower surface of the rotating block is fixedly connected to a connecting cylinder, the bottom end of the connecting cylinder passes through the lower surface of the circular shell, the inner wall of the connecting cylinder is clamped with the output end of the micro servo motor, the lower surface of the hollow circular shell is provided with a circular hole matching the outer wall of the connecting cylinder, the bottom end of the rotating block is provided with a cavity, the cavity wall of the cavity is fixedly connected to an arc-shaped guide tube, the inlet of the arc-shaped guide tube passes through the hole wall of the medium through hole, the top cavity wall of the cavity is fixedly connected to a nozzle, and the top end of the nozzle is located directly below the detection end of the pressure transmitter body.

[0008] In the above-mentioned anti-blocking pressure transmitter, the hole wall of the medium through hole is provided with an annular compensation groove for compensating the space occupied by the nozzle and the arc-shaped flow guide tube.

[0009] In the above-mentioned anti-blocking pressure transmitter, the anti-freezing mechanism includes an insulating inner ring fixedly connected to the inner wall of the insulating sealing cover, two micro electric heating tubes are fixedly embedded in the bottom end of the insulating inner ring, a plurality of air intake check valves are fixedly embedded in the upper surface of the top of the insulating sealing cover located on the outside of the insulating inner ring, the bottom end of the insulating sealing cover is fixedly connected with an exhaust check valve, the inner wall of the insulating inner ring is fixedly connected with a micro air pump and a PLC controller, the air inlet end of the micro air pump is fixedly connected with a bent pipe, the air inlet end of the bent pipe passes through the inner wall of the insulating inner ring, the output end of the micro air pump is fixedly connected with an injection pipe, the air outlet end of the injection pipe is fixedly connected with a protective mechanism for protecting the screen of the pressure transmitter body, the outer wall of the insulating sealing cover is fixedly embedded with a connecting pipe, and the inner wall of the connecting pipe is fixedly connected with a temperature sensor.

[0010] In the above-mentioned anti-blocking pressure transmitter, the protective mechanism includes a hollow block fixedly connected to the air outlet end of the injection pipe, the bottom end of the hollow block is fixedly connected to the outer wall of the hollow circular shell, the top end of the hollow block is fixedly connected to a normally closed solenoid valve and a delivery pipe, the air outlet end of the delivery pipe is fixedly connected to a hollow ring, the outer wall of the hollow ring is fixedly connected to the outer wall of the pressure transmitter body, and the inner outer wall of the hollow ring is fixedly connected to a plurality of injection holes.

[0011] In the above-mentioned anti-blocking pressure transmitter, a reinforcing plate is fixedly connected to the inner wall of the heat-insulating inner ring, and a through hole for the detection end of the pressure transmitter body to pass through is opened at the center of the reinforcing plate.

[0012] In the above-mentioned anti-blocking pressure transmitter, a connecting through hole matching with the outer wall of the pressure transmitter body is provided at the top of the heat-insulating sealing cover, and a rubber ring for sealing the connecting through hole is fixedly sleeved on the outer wall of the pressure transmitter body.

[0013] In the above-mentioned anti-blocking pressure transmitter, a square groove is formed at one end of the connecting tube close to the micro servo motor, and a rectangular connecting end matching the square groove is formed at the output end of the micro servo motor.

[0014] Compared with the existing technology, the advantages of an anti-blocking pressure transmitter are: 1. Through the anti-blocking mechanism, hollow shell, rotating block and medium through-hole, when the pressure transmitter is in use, firstly, the automatic program for controlling the anti-blocking mechanism is preset in the PLC controller to prevent the pressure transmitter from being blocked by medium impurities. Specifically, the PLC controller controls the anti-blocking mechanism to work for two minutes every five hours and fifty-eight minutes. During these two minutes, the PLC controller first controls the output end of the micro servo motor to rotate 180 degrees, and at the same time, the inlet and outlet positions of the medium through-hole in the rotating block are reversed, and the original outlet end of the medium through-hole is converted into the inlet end. At this time, the flowing After the medium enters the medium through hole of the rotating block, it is equivalent to backwashing and cleaning the medium through hole that has not been adjusted in orientation, and the impurities attached to the detection end of the pressure transmitter can be cleaned in cooperation with the nozzle and the arc-shaped guide tube to avoid excessive accumulation of medium impurities inside the pressure transmitter and cause blockage. This mechanism enables the pressure transmitter to have the function of preventing medium impurities from accumulating and clogging, and also has the function of automatic cleaning of accumulated medium impurities, which can not only improve the continuity and reliability of the pressure transmitter, but also improve the accuracy of the pressure transmitter in detecting fluid medium pressure, and can improve the convenience of pressure transmitter maintenance.

[0015] 2. Through the anti-freezing mechanism and the heat-insulating sealing cover, when the pressure transmitter encounters a low-temperature environment during use, the temperature sensor detects the ambient temperature and sends an electrical signal to the PLC controller. If the temperature detected by the temperature sensor is lower than the temperature threshold preset in degrees Celsius by the PLC controller, the PLC controller controls the anti-freezing mechanism to generate hot air, which is transported to the hollow block. Part of the hot air enters the delivery pipe, and the other part of the hot air enters the heat-insulating sealing cover through the opened normally closed solenoid valve. The heat carried in the hot air is used to increase the temperature of the fluid medium in the connecting pipe, the hollow shell and the medium through hole to prevent the moisture in the fluid medium from condensing into ice due to the low-temperature environment, so that the fluid medium can pass through the pressure transmitter smoothly, avoiding ice blockage in the pressure transmitter. This mechanism enables the pressure transmitter to have the function of anti-freezing and blockage in a low-temperature environment, thereby not only improving the continuity and reliability of the pressure transmitter, but also improving the accuracy of the pressure transmitter in detecting the pressure of the fluid medium.

[0016] 3. Through the protection mechanism set up, when the anti-blocking mechanism is activated, the air delivered to the protection mechanism by the micro air pump is sprayed to the display screen of the pressure transmitter body through the jet hole, and a dust purge air layer is formed on the outside of the display screen of the pressure transmitter body. The dust purge air layer can avoid dust accumulation and affect the clarity of the observation of the pressure transmitter body detection data. When the anti-freezing mechanism is controlled and started by the PLC controller, the hot air entering the protection mechanism at this time can not only purge the dust at the display screen of the pressure transmitter body, but also use the heat carried by the hot air to prevent the moisture in the outside air from condensing into an ice layer at the display screen of the pressure transmitter body. This mechanism can effectively improve the protection capability of the pressure transmitter, and make the display screen of the pressure transmitter have dustproof and anti-freezing functions, which can not only improve the clarity of the observation of the detection data on the display screen of the pressure transmitter, but also improve the reliability of the use of the pressure transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an anti-blocking pressure transmitter provided by the present invention; Figure 2 It is a structural schematic diagram of a rotating block in an anti-blocking pressure transmitter provided by the present invention; Figure 3 It is a structural schematic diagram of an arc-shaped flow guide tube in an anti-blocking pressure transmitter provided by the present invention; Figure 4 It is a structural schematic diagram of a sealing ring part in an anti-blocking pressure transmitter provided by the present invention; Figure 5 It is a structural schematic diagram of an anti-blocking mechanism in an anti-blocking pressure transmitter provided by the present invention; Figure 6It is a structural schematic diagram of an anti-freezing mechanism in an anti-blocking pressure transmitter provided by the present invention; Figure 7 It is a structural schematic diagram of a hollow block portion in an anti-blocking pressure transmitter provided by the present invention; Figure 8 It is a structural schematic diagram of a hollow ring part in an anti-blocking pressure transmitter provided by the present invention; Fig. 9 It is a structural schematic diagram of a connecting tube part in an anti-blocking pressure transmitter provided by the present invention.

[0018] In the figure: 1 pressure transmitter body, 2 hollow round shell, 3 sealing rubber layer, 4 rotating block, 5 medium through hole, 6 sealing ring, 7 anti-blocking mechanism, 71 connecting frame, 72 micro servo motor, 73 connecting cylinder, 74 cavity, 75 arc guide pipe, 76 nozzle, 8 anti-freezing mechanism, 81 thermal insulation inner ring, 82 micro electric heating tube, 83 intake check valve, 84 exhaust check valve, 85 micro air pump, 86 PLC controller, 87 elbow, 88 jet pipe, 89 connecting pipe, 810 temperature sensor, 9 protection mechanism, 91 hollow block, 92 normally closed solenoid valve, 93 delivery pipe, 94 hollow ring, 95 jet hole, 10 connecting pipe, 11 fixing flange, 12 thermal insulation sealing cover, 13 annular compensation groove, 14 reinforcement plate, 15 rubber ring, 16 square groove, 17 detection through hole. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figure 1-Figure 9 As shown, a blockage-proof pressure transmitter comprises a pressure transmitter body 1, a detection end of the pressure transmitter body 1 is sealedly connected with a hollow circular shell 2, a connecting thread matching with the bottom end of the pressure transmitter body 1 is provided at the center of the upper surface of the hollow circular shell 2, a sealing rubber layer 3 is fixedly connected to the inner wall of the hollow circular shell 2, a rotating block 4 is sealedly connected to the inner wall of the sealing rubber layer 3, a medium through hole 5 is provided on the side wall of the rotating block 4, a detection through hole 17 matching with the bottom end of the pressure transmitter body 1 is provided on the upper surface of the rotating block 4, and a sealing ring 6 is fixedly embedded in the hole wall of the detection through hole 17, a sealing groove matching with the sealing ring 6 is provided on the outer wall of the detection end of the pressure transmitter body 1, and the detection through hole 17 is vertically connected with the cavity of the medium through hole 5.

[0021] The lower surface of the hollow circular shell 2 is fixedly connected with an anti-blocking mechanism 7, and the anti-blocking mechanism 7 includes a connecting frame 71 fixedly connected to the lower surface of the hollow circular shell 2, and the bottom end of the connecting frame 71 is fixedly connected to a micro servo motor 72, and the lower surface of the rotating block 4 is fixedly connected with a connecting cylinder 73, and the end of the connecting cylinder 73 close to the micro servo motor 72 is provided with a square groove 16, and the output end of the micro servo motor 72 is provided with a rectangular connecting end that matches the square groove 16, and the square groove 16 can ensure the reliability of the transmission between the connecting cylinder 73 and the micro servo motor 72, and the bottom end of the connecting cylinder 73 passes through the lower surface of the circular shell, and the inner wall of the connecting cylinder 73 is clamped with the output end of the micro servo motor 72, and the lower surface of the hollow circular shell 2 is provided with a circular hole that matches the outer wall of the connecting cylinder 73, and the bottom end of the rotating block 4 is provided with a cavity 74, and the cavity wall of the cavity 74 is fixedly connected There is an arc-shaped flow guide tube 75, the inlet of which passes through the hole wall of the medium through hole 5. The top wall of the cavity 74 is fixedly connected with a nozzle 76. The top of the nozzle 76 is located directly below the detection end of the pressure transmitter body 1. The hole wall of the medium through hole 5 is provided with an annular compensation groove 13 for compensating the space occupied by the nozzle 76 and the arc-shaped flow guide tube 75. The annular compensation groove 13 can ensure that the efficiency of the medium through hole 5 and the connecting pipe 10 in conveying the fluid medium is consistent, thereby ensuring that the pressure transmitter detects the medium pressure inaccurately. This mechanism enables the pressure transmitter to have the function of preventing the accumulation and blockage of medium impurities, and also has the function of automatically cleaning the accumulated medium impurities, which can not only improve the continuity and reliability of the pressure transmitter, but also improve the accuracy of the pressure transmitter in detecting the fluid medium pressure, and can improve the convenience of pressure transmitter maintenance.

[0022] The outer walls on both sides of the hollow shell 2 are fixedly connected with connecting pipes 10 with the same aperture as the medium through hole 5. The side of the connecting pipe 10 away from the hollow shell 2 is fixedly connected with a fixing flange 11. The opposite sides of the two fixing flanges 11 are commonly fixedly connected with a heat-insulating sealing cover 12. The top of the heat-insulating sealing cover 12 is provided with a connecting through hole that matches the outer wall of the pressure transmitter body 1. The outer wall of the pressure transmitter body 1 is fixedly sleeved with a rubber ring 15 for connecting the through hole sealing. The rubber ring 15 can improve the sealing performance of the connection between the heat-insulating sealing cover 12 and the pressure transmitter body 1.

[0023] The inner wall of the heat-insulating sealing cover 12 is fixedly connected with an anti-freezing mechanism 8, and the anti-freezing mechanism 8 includes a heat-insulating inner ring 81 fixedly connected to the inner wall of the heat-insulating sealing cover 12, and the inner wall of the heat-insulating inner ring 81 is fixedly connected with a reinforcing plate 14, and a through hole for the detection end of the pressure transmitter body 1 to pass through is opened at the center of the reinforcing plate 14, and the reinforcing plate 14 can improve the structural strength of the heat-insulating inner ring 81, and two micro electric heating tubes 82 are fixedly embedded in the bottom end of the heat-insulating inner ring 81, and a plurality of air intake check valves 83 are fixedly embedded on the upper surface of the top of the heat-insulating sealing cover 12 located at the outside of the heat-insulating inner ring 81, and the bottom end of the heat-insulating sealing cover 12 is fixedly connected with an exhaust check valve 84, and the inner wall of the heat-insulating inner ring 81 is fixedly connected with a micro air pump 85 and a PLC controller 86. The air inlet end of the pump 85 is fixedly connected to a bend pipe 87, and the air inlet end of the bend pipe 87 passes through the inner wall of the heat-insulating inner ring 81. The output end of the micro air pump 85 is fixedly connected to an injection pipe 88. A connecting pipe 89 is fixedly embedded in the outer wall of the heat-insulating sealing cover 12. A temperature sensor 810 is fixedly connected to the inner wall of the connecting pipe 89. The temperature measuring end of the temperature sensor 810 is located inside the connecting pipe 89 and can detect the external ambient temperature. The connecting pipe 89 can protect the temperature sensor 810 to avoid damage by foreign objects. This mechanism enables the pressure transmitter to have the function of preventing freezing and blockage in low-temperature environments, thereby not only improving the continuity and reliability of the pressure transmitter, but also improving the accuracy of the pressure transmitter in detecting the pressure of the fluid medium.

[0024] The air outlet end of the jet pipe 88 is fixedly connected to a protective mechanism 9 for protecting the screen of the pressure transmitter body 1. The protective mechanism 9 includes a hollow block 91 fixedly connected to the air outlet end of the jet pipe 88. The bottom end of the hollow block 91 is fixedly connected to the outer wall of the hollow circular shell 2. The top of the hollow block 91 is fixedly connected to a normally closed solenoid valve 92 and a delivery pipe 93. The air outlet end of the delivery pipe 93 is fixedly connected to a hollow ring 94. The outer wall of the hollow ring 94 is fixedly connected to the outer wall of the pressure transmitter body 1. The inner outer wall of the hollow ring 94 is fixedly connected to a plurality of jet holes 95. This mechanism can effectively improve the protection capability of the pressure transmitter and enable the pressure transmitter display screen to have dust and anti-freezing functions, which can not only improve the clarity of the observation of the detection data on the pressure transmitter display screen, but also improve the reliability of the use of the pressure transmitter.

[0025] The micro servo motor 72, micro electric heating tube 82, micro air pump 85 and normally closed solenoid valve 92 are all electrically connected to the output end of the PLC controller 86 through wires, and the temperature sensor 810 is electrically connected to the input end of the PLC controller 86 through wires. The temperature sensor 810 can convert the temperature into an electrical signal and transmit the electrical signal to the PLC controller 86. The PLC controller 86 controls the operation of the corresponding powered device at the output end according to the input electrical signal. The above-mentioned powered devices and electrical connections are all existing technologies and will not be repeated here.

[0026] The operating principle of the present invention is described as follows: When the pressure transmitter is in use, firstly, an automatic program for controlling the anti-blocking mechanism 7 to work is preset in the PLC controller 86 to prevent the pressure transmitter from being blocked by medium impurities. Specifically, the PLC controller 86 controls the anti-blocking mechanism 7 to work for two minutes every five hours and fifty-eight minutes. During these two minutes, the PLC controller 86 first controls the micro servo motor 72 to rotate 180 degrees, and then the micro servo motor 72 is controlled by the PLC controller 86 to maintain the rotated state. At the same time, the PLC controller 86 also controls the micro air pump 85 to pump air for two minutes. At 1:00 p.m., the micro servo motor 72 rotates 180 degrees, and at the same time, drives the rotating block 4 to rotate 180 degrees in the hollow shell 2 through the square groove 16 and the connecting tube 73, and then the inlet and outlet positions of the medium through hole 5 in the rotating block 4 are reversed, and the original outlet end of the medium through hole 5 is converted into the inlet end. At this time, after the flowing medium enters the medium through hole 5 of the rotating block 4, it is equivalent to performing a backwash cleaning process on the medium through hole 5 that has not been adjusted in position, so as to avoid the situation where too much medium impurities accumulate in the pressure transmitter and cause blockage. Moreover, after the medium through hole 5 is reversed in position, the position of the inlet of the arc-shaped guide tube 75 rotates 18 degrees accordingly. 0 degrees, more fluid medium can enter the cavity 74 through the arc-shaped flow guide tube 75, and finally be sprayed to the detection end of the pressure transmitter body 1 through the nozzle 76. Since the inner diameter of the nozzle 76 is smaller than the inner diameter of the cavity 74, the fluid medium in the cavity 74 will be accelerated after entering the nozzle 76. The high-speed fluid medium can further clean the medium impurities attached to the bottom of the detection end of the pressure transmitter body 1, avoid the accumulation of medium impurities at the detection end of the pressure transmitter body 1 and cause blockage, and avoid the pressure transmitter body 1 from being damaged due to blockage, and ensure the accuracy of the pressure transmitter body 1 in detecting the fluid medium pressure. , and there is no need to manually clean up the accumulated medium impurities, saving time and effort. After the two-minute countdown is completed, the PLC controller 86 controls the micro servo motor 72 to rotate 180 degrees, so that the medium through hole 5 in the rotating block 4 returns to the initial position, and the medium pressure is detected through the pressure transmitter body 1. This mechanism enables the pressure transmitter to have the function of preventing medium impurities from accumulating and clogging, and also has the function of automatically cleaning the accumulated medium impurities, which can not only improve the continuity and reliability of the pressure transmitter, but also improve the accuracy of the pressure transmitter in detecting the fluid medium pressure, and can improve the convenience of pressure transmitter maintenance; When the pressure transmitter encounters a low temperature environment during use, the temperature sensor 810 detects the ambient temperature and sends it to the PLC controller 86 in the form of an electrical signal. If the temperature detected by the temperature sensor 810 is lower than the temperature threshold of 5 degrees Celsius preset by the PLC controller 86, the PLC controller 86 not only controls the micro electric heating tube 82 to be powered on and started, but also controls the normally closed solenoid valve 92 to be powered on and opened. The PLC controller 86 controls the heating temperature of the micro electric heating tube 82 to be 30 degrees Celsius. After the micro air pump 85 is started, it draws air from the micro electric heating tube 82 through the curved pipe 87, and places the area near the micro electric heating tube 82 in a negative pressure environment. The negative pressure environment is then supplemented by the outside air through the air intake check valve 83. The outside air is heated after passing through the micro electric heating tube 82, and forms hot air at 23 degrees Celsius. The hot air is then sprayed onto the hollow block 91 through the jet pipe 88. At the same time, part of the hot air in the hollow block 91 enters the delivery pipe 93, and the other part of the hot air enters the heat-insulating seal through the opened normally closed solenoid valve 92. The heat carried in the hot air is used to increase the temperature of the fluid medium in the connecting pipe 10, the hollow shell 2 and the medium through hole 5, so as to prevent the moisture in the fluid medium from condensing into ice due to the low temperature environment, so that the fluid medium can pass through the pressure transmitter smoothly, avoid ice blockage in the pressure transmitter, prevent the detection end of the pressure transmitter body 1 from being damaged due to blockage, and ensure the accuracy of the pressure transmitter body 1 in detecting the pressure of the fluid medium. Finally, the air is discharged through the exhaust check valve 84, and while the anti-freezing mechanism 8 is working, the anti-blocking mechanism 7 is started by the PLC controller 86 for two minutes every five hours and fifty-eight minutes, and the control is still executed. However, at this time, the working time of the micro air pump 85 is not limited by the two-minute countdown, but will continue with the operation of the anti-freezing mechanism 8. This mechanism enables the pressure transmitter to have the function of anti-freezing blockage in a low temperature environment, thereby not only improving the continuity and reliability of the pressure transmitter, but also improving the accuracy of the pressure transmitter in detecting the pressure of the fluid medium. When the anti-clogging mechanism 7 is controlled by the PLC controller 86 to work for two minutes, the micro air pump 85 draws outside air through the bend 87 and the air inlet check valve 83, and the air is transported to the hollow ring 94 through the jet pipe 88, the hollow block 91 and the delivery pipe 93. Then the air is sprayed to the display screen of the pressure transmitter body 1 through the multiple jet holes 95 in the hollow ring 94, and a dust purge air layer is formed on the outside of the display screen of the pressure transmitter body 1. The dust purge air layer can prevent dust accumulation from affecting the clarity of the pressure transmitter detection data observation. When the anti-freezing mechanism 8 is controlled to start by the PLC controller 86, part of the hot air transported to the hollow block 91 by the micro air pump 85 is transported to the hollow ring 94 through the delivery pipe 93. Finally, the hot air is sprayed to the hollow block 91 through the delivery pipe 93. The air hole 95 sprays onto the display screen of the pressure transmitter body 1. At this time, the hot air sprayed from the air hole 95 can not only blow away the dust on the display screen of the pressure transmitter body 1, but also use the heat carried by the hot air to prevent moisture in the outside air from condensing into an ice layer on the display screen of the pressure transmitter body 1, thereby preventing the pressure transmitter display screen from being covered by an ice layer and making it impossible to clearly observe the detection data, and can prevent the electronic components in the pressure transmitter body 1 from being damaged by the low temperature. This mechanism can effectively improve the protection capability of the pressure transmitter, and make the pressure transmitter display screen have dust and anti-freezing functions, which can not only improve the clarity of the observation of the detection data on the pressure transmitter display screen, but also improve the reliability of the use of the pressure transmitter.

[0027] 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 blockage-proof pressure transmitter, comprising a pressure transmitter body (1), characterized in that: The detection end of the pressure transmitter body (1) is sealedly connected to a hollow circular shell (2), a connection thread matching the bottom end of the pressure transmitter body (1) is provided at the center of the upper surface of the hollow circular shell (2), a sealing rubber layer (3) is fixedly connected to the inner wall of the hollow circular shell (2), the inner wall of the sealing rubber layer (3) is sealedly connected to a rotating block (4), a medium through hole (5) is provided on the side wall of the rotating block (4), a detection through hole (17) matching the bottom end of the pressure transmitter body (1) is provided on the upper surface of the rotating block (4), and a sealing ring (6) is fixedly embedded in the hole wall of the detection through hole (17), and the pressure transmitter body (1) is provided with a sealing ring (6) fixedly embedded in the hole wall of the detection through hole (17). The outer wall of the detection end of the body (1) is provided with a sealing groove matched with the sealing ring (6); the detection through hole (17) is vertically connected to the cavity of the medium through hole (5); the lower surface of the hollow circular shell (2) is fixedly connected with an anti-blocking mechanism (7); the outer walls on both sides of the hollow circular shell (2) are fixedly connected with connecting pipes (10) with the same aperture as the medium through hole (5); the side of the connecting pipe (10) away from the hollow circular shell (2) is fixedly connected with a fixing flange (11); the opposite sides of the two fixing flanges (11) are fixedly connected with a heat insulation sealing cover (12); the inner wall of the heat insulation sealing cover (12) is fixedly connected with an anti-freezing mechanism (8).

2. The anti-blocking pressure transmitter according to claim 1, characterized in that: The anti-blocking mechanism (7) comprises a connecting frame (71) fixedly connected to the lower surface of the hollow circular shell (2), the bottom end of the connecting frame (71) is fixedly connected to a micro servo motor (72), the lower surface of the rotating block (4) is fixedly connected to a connecting tube (73), the bottom end of the connecting tube (73) passes through the lower surface of the circular shell, the inner wall of the connecting tube (73) is clamped with the output end of the micro servo motor (72), the lower surface of the hollow circular shell (2) is provided with a circular hole matching the outer wall of the connecting tube (73), the bottom end of the rotating block (4) is provided with a cavity (74), the cavity wall of the cavity (74) is fixedly connected to an arc-shaped flow guide tube (75), the inlet of the arc-shaped flow guide tube (75) passes through the hole wall of the medium through hole (5), the top cavity wall of the cavity (74) is fixedly connected to a nozzle (76), and the top end of the nozzle (76) is located directly below the detection end of the pressure transmitter body (1).

3. The anti-blocking pressure transmitter according to claim 2, characterized in that: The hole wall of the medium through hole (5) is provided with an annular compensation groove (13) for compensating the space occupied by the nozzle (76) and the arc-shaped flow guide tube (75).

4. The anti-blocking pressure transmitter according to claim 1, characterized in that: The anti-freezing mechanism (8) comprises a heat-insulating inner ring (81) fixedly connected to the inner wall of the heat-insulating sealing cover (12); two micro electric heating tubes (82) are fixedly embedded in the bottom end of the heat-insulating inner ring (81); a plurality of air intake check valves (83) are fixedly embedded in the upper surface of the top end of the heat-insulating sealing cover (12) located outside the heat-insulating inner ring (81); an exhaust check valve (84) is fixedly connected to the bottom end of the heat-insulating sealing cover (12); and a micro air pump (85) and a PLC controller (86) are fixedly connected to the inner wall of the heat-insulating inner ring (81). 86), the air inlet end of the micro air pump (85) is fixedly connected to a bent pipe (87), the air inlet end of the bent pipe (87) passes through the inner wall of the heat-insulating inner ring (81), the output end of the micro air pump (85) is fixedly connected to an injection pipe (88), the air outlet end of the injection pipe (88) is fixedly connected to a protection mechanism (9) for screen protection of the pressure transmitter body (1), the outer wall of the heat-insulating sealing cover (12) is fixedly embedded with a connecting pipe (89), and the inner wall of the connecting pipe (89) is fixedly connected to a temperature sensor (810).

5. The anti-blocking pressure transmitter according to claim 4, characterized in that: The protection mechanism (9) comprises a hollow block (91) fixedly connected to the air outlet end of the air jet pipe (88), the bottom end of the hollow block (91) is fixedly connected to the outer wall of the hollow circular shell (2), the top end of the hollow block (91) is fixedly connected to a normally closed electromagnetic valve (92) and a delivery pipe (93), the air outlet end of the delivery pipe (93) is fixedly connected to a hollow ring (94), the outer wall of the hollow ring (94) is fixedly connected to the outer wall of the pressure transmitter body (1), and the inner outer wall of the hollow ring (94) is fixedly connected to a plurality of air jet holes (95).

6. The anti-blocking pressure transmitter according to claim 4, characterized in that: A reinforcing plate (14) is fixedly connected to the inner wall of the heat-insulating inner ring (81), and a through hole for the detection end of the pressure transmitter body (1) to pass through is provided at the center of the reinforcing plate (14).

7. The anti-blocking pressure transmitter according to claim 1, characterized in that: A connecting through hole matching the outer wall of the pressure transmitter body (1) is provided at the top end of the heat-insulating sealing cover (12), and a rubber ring (15) for sealing the connecting through hole is fixedly sleeved on the outer wall of the pressure transmitter body (1).

8. The anti-blocking pressure transmitter according to claim 2, characterized in that: A square groove (16) is formed at one end of the connection cylinder (73) close to the micro servo motor (72), and a rectangular connection end matching the square groove (16) is formed at the output end of the micro servo motor (72).

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