Plug-in backflushing differential pressure transmitter

Abstract

The application relates to the technical field of differential pressure transmitters, and discloses an inserted backwashing differential pressure transmitter which comprises an inserted pipe, the inserted pipe is embedded with an inner pipe, a flushing pipe is arranged at the top of the inner pipe, a control valve is arranged in the flushing pipe, two outer clamps are sealingly inserted on the outside of the inserted pipe, a pressure analyzer is arranged at the top of the two outer clamps, a measuring mechanism is arranged in the inner part of the outer clamp and the pressure analyzer, the control valve comprises a valve body, a top plug, a driving plug and a transmission part, and two pressure boosting channels are arranged in the inner part of the valve body. The transmission part comprises two fixed piles which are fixedly connected to the bottom of the valve body, a rotating shaft is rotationally connected to the side of each fixed pile, a cut-off plate is fixedly connected to the outside of the rotating shaft, and a cam is fixedly connected to the other end of the rotating shaft. In the application, the pressure measurement and the flushing are automatically switched through the linkage of the mechanical, magnetic and buoyancy, manual operation is not needed, the measurement precision is improved, the anti-clogging capacity is enhanced, the maintenance cost is reduced, and stable operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of differential pressure transmitters, in particular to an insertion type backwashing differential pressure transmitter. BACKGROUND

[0002] The backwashing differential pressure transmitter is a core instrument in the field of industrial automation for differential pressure measurement and device self-cleaning. Its core function is to collect the pressure difference of the medium in the industrial pipeline or container through the sensing element, and then indirectly monitor the process parameters such as medium level, flow rate, and density. At the same time, relying on the backwashing system, the impurities (such as particles, crystalline substances, and sticky attachments) attached to the sensing element and flow passage are periodically removed to avoid blockage and ensure long-term stable operation of the device. This type of instrument is widely used in industries such as chemical, petrochemical, power, and water treatment, and is particularly suitable for scenarios with high solid content, easy crystallization, or strong viscosity (such as desulfurization absorption tower slurry level measurement, polypropylene reactor level monitoring, sewage treatment plant sludge interface detection, etc.). It is one of the key devices to ensure precise control and safe operation of industrial production processes.

[0003] Currently, the mainstream backwashing differential pressure transmitter in the industrial field adopts the design mode of "separation of pressure measurement unit and flushing unit" in terms of structure and control logic. Its typical structure usually includes an insertion type pressure taking pipe, an independent pressure measurement module (containing a fixed installed sensing diaphragm and a pressure sensor), an external backwashing pipeline (containing a stop valve and a solenoid valve), and an independent control unit (such as a manual operation panel or a simple timer). In the working process, the pressure measurement module needs to be turned on by manual confirmation of the medium state during the pressure measurement stage, and the pressure is sensed by the sensing diaphragm and converted into an electrical signal. In the backwashing stage, the stop valve needs to be manually opened by manual judgment of the blockage condition, or the solenoid valve is triggered by a fixed period timer to introduce external cleaning medium into the flushing pipeline to flush the sensing diaphragm and pressure taking flow passage.

[0004] However, in the prior art, the switching between pressure measurement and backwashing lacks a self-adaptive linkage mechanism based on the medium state, and an integrated control structure is not provided through mechanical, magnetic, or buoyancy cooperation. Therefore, the function switching is mainly realized by independent manual operation or a single timing instruction, which makes it difficult to automatically control the pressure measurement and flushing modes according to the medium state, and may cause problems such as blockage due to lack of timely flushing when the medium exists or waste of cleaning medium due to excessive flushing when the medium disappears.

[0005] Therefore, in view of the above problems, an insertion type backwashing differential pressure transmitter is proposed to solve the above problems. SUMMARY

[0006] In order to make up for the above shortcomings, the application provides an insertion type backwashing differential pressure transmitter, aiming at improving the problem that the differential pressure transmitter in the prior art is difficult to automatically regulate and control the pressure measurement and flushing mode according to the existing state of the medium.

[0007] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0008] An insertion type backwashing differential pressure transmitter, comprising an insertion pipe, an inner pipe is embedded in the insertion pipe, and a flushing pipe is arranged at the top of the inner pipe, a control valve is arranged in the inner part of the flushing pipe, two outer clamps are sealingly inserted on the outer part of the insertion pipe, a pressure analyzer is arranged at the top of the two outer clamps, and a measuring mechanism is arranged in the inner part of the outer clamp and the pressure analyzer;

[0009] The control valve comprises a valve body, a top plug, a driving plug and a transmission part, and two pressure boosting channels are arranged in the inner part of the valve body;

[0010] The transmission part comprises two fixed piles which are fixedly connected to the bottom of the valve body, a rotating shaft is rotatably connected to the side of the fixed pile, a cut-off plate is fixedly connected to the outer side of the rotating shaft, and a cam is fixedly connected to the other end of the rotating shaft;

[0011] The transmission part further comprises two clamping plates, the two ends of the clamping plate are slidingly connected to the inner side of the two fixed piles, two reset springs are arranged between the two clamping plates, a magnetic counterweight ring is magnetically connected to the inner side of the bottom of the clamping plate, and a connecting spring is arranged between the magnetic counterweight ring and the bottom of the clamping plate;

[0012] Further description of the above technical scheme:

[0013] The top plug comprises a plurality of telescopic sleeve columns with springs arranged in the inner part, the bottom of the telescopic sleeve column is fixedly connected to the top of the valve body, the top of the telescopic sleeve column is fixedly connected to a plugging plug which is matched with the shape of the opening at the top of the valve body, two sealing rings are arranged on the outer side of the bottom of the plugging plug, and a magnetic block one is arranged on the bottom of the plugging plug;

[0014] Further description of the above technical scheme:

[0015] The driving plug comprises a buoyancy ball, a connecting rod is fixedly connected to the top of the buoyancy ball, a sliding plug is arranged on the top of the connecting rod and slidingly connected to the bottom of the valve body, a magnetic block two is arranged on the top of the sliding plug, and a butt joint ring which is matched with the shape of the inner side of the magnetic counterweight ring is fixedly connected to the outer side of the connecting rod;

[0016] Further description of the above technical scheme:

[0017] A correction plate is arranged on the outer side of the joint between the bottom of the clamping plate and the magnetic counterweight ring, which is used to correct the butt joint direction of the magnetic counterweight ring;

[0018] Further description of the above technical scheme:

[0019] The outer part of the flushing pipe is provided with an external connecting pipe, and the outer end of the external connecting pipe is connected with a conveying device for conveying backwashing medium;

[0020] As a further description of the above technical solution:

[0021] The measuring mechanism comprises a supporting ring mounted at the bottom of the outer cover, the inner side of the supporting ring is slidably connected with a sensing film, the top of the sensing film is provided with a sliding arc plate, the inner part of the connecting part of the outer cover and the supporting ring is provided with a plurality of sliding rods, the inner side of the sliding arc plate is slidably connected with the outer side of the sliding rods, the outer side of the sliding rods is sleeved with a reset spring I fixed with one side of the sliding arc plate, and the connecting part of the outer cover and the supporting ring is provided with a flexible sealing plate flush with the sliding arc plate;

[0022] As a further description of the above technical solution:

[0023] The measuring mechanism further comprises a pressure introduction channel opened in the inner part of the outer cover and the bottom of the pressure analyzer, the inner part of the pressure analyzer is provided with a sensing cavity, the inner part of the sensing cavity is provided with a separation diaphragm, and the top of the separation diaphragm is provided with a sensitive element connected with the internal circuit element of the pressure analyzer;

[0024] As a further description of the above technical solution:

[0025] The pressure introduction channel is in communication with the sensing cavity and is filled with filling liquid.

[0026] The present application has the following beneficial effects:

[0027] In the present application, when the fluid exists, the buoyancy ball drives the driving plug to move upwards, the magnetic attraction block cooperates to block the opening of the valve body of the plug, and the linkage of the structure such as the flow interception plate ensures that the flushing pipe is closed with the inner pipe, avoids the interference of the backwashing medium, and provides a stable environment for pressure measurement; after the fluid disappears, the buoyancy disappears, the flow interception plate resets to drive the clamping plate to move, the magnetic counterweight ring is clamped with the butt joint ring to make the driving plug move downwards, the plug is opened, the pressure increasing channel is opened, the backwashing medium flushes the sensing film, and the impurities are efficiently removed and the blockage is reduced. The whole realizes automatic switching of pressure measurement and flushing through linkage of mechanics, magnetism and buoyancy, without manual operation, which improves the measurement accuracy, enhances the anti-clogging ability, reduces the maintenance cost, and guarantees stable operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A perspective view of an insertion type backwashing differential pressure transmitter is provided for the present application;

[0029] Figure 2 A structural view of an inner pipe of an insertion type backwashing differential pressure transmitter is provided for the present application;

[0030] Figure 3This is a schematic diagram of the measuring mechanism of an insertion-type backflushing differential pressure transmitter proposed in this invention;

[0031] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0032] Figure 5 This is a schematic diagram of the pressure analyzer of an insertion-type backflushing differential pressure transmitter proposed in this invention;

[0033] Figure 6 This is a schematic diagram of the flushing pipe of an insertion-type backflushing differential pressure transmitter proposed in this invention;

[0034] Figure 7 This is a schematic diagram of the control valve of an insertion-type backflushing differential pressure transmitter proposed in this invention;

[0035] Figure 8 This is a schematic diagram of the drive plug of an insertion-type backflushing differential pressure transmitter proposed in this invention;

[0036] Figure 9 This is a schematic diagram of the transmission component of an insertion-type backflushing differential pressure transmitter proposed in this invention.

[0037] Legend:

[0038] 1. Insertion tube; 2. Inner tube; 3. Flushing tube; 4. Outer tube; 5. Outer frame; 6. Pressure analyzer; 7. Measuring mechanism; 701. Support ring; 702. Sensing diaphragm; 703. Sliding arc plate; 704. Slide rod; 705. Return spring 1; 706. Flexible sealing plate; 707. Pressure channel; 708. Sensing chamber; 709. Isolation diaphragm; 710. Sensitive element; 8. Control valve; 81. Valve body; 82. Top plug; 821. Telescopic sleeve 822. Column; 823. Sealing plug; 824. Magnetic block one; 83. Drive plug; 831. Buoyancy ball; 832. Connecting rod; 833. Docking ring; 834. Sliding plug; 835. Magnetic block two; 84. Transmission component; 841. Fixed pile; 842. Rotating shaft; 843. Cut-off plate; 844. Cam; 845. Clamping plate; 846. Return spring two; 847. Connecting spring; 848. Magnetic counterweight ring; 85. Pressure boosting channel. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] With reference to Figures 1 to 9 An embodiment of the present application provides an insertion type backwashing differential pressure transmitter, which comprises an insertion pipe 1, the insertion pipe 1 provides a channel for fluid entering devices and is a connecting part of the devices and external pipelines, an inner pipe 2 is embedded in the insertion pipe 1, the inner pipe 2 is nested in the inside of the insertion pipe 1 and is a main fluid circulation path in the devices, so that the stable fluid transmission is guaranteed, and a flushing pipe 3 is arranged at the top of the inner pipe 2, the flushing pipe 3 is a channel for backwashing medium entering the devices and carries the medium conveying in the backwashing process, an external connecting pipe 4 is arranged outside the flushing pipe 3, and the outer end of the external connecting pipe 4 is connected with a conveying device for conveying the backwashing medium, and the external connecting pipe 4 realizes the external access of the backwashing medium. The inside of the flushing pipe 3 is provided with a control valve 8, the control valve 8 integrally controls the switching of the pressure measurement and the backwashing state, the opening and closing of the control channel are realized through the cooperation of the internal components, two outer clamps 5 are sealingly inserted outside the insertion pipe 1, the top of the two outer clamps 5 is provided with a pressure analyzer 6, and the inside of the outer clamps 5 and the pressure analyzer 6 is provided with a measuring mechanism 7, the measuring mechanism 7 realizes the detection and analysis of the pressure, and converts the fluid pressure into an electric signal for subsequent processing.

[0041] The control valve 8 comprises a valve body 81, a top plug 82, a drive plug 83 and a transmission member 84. The valve body 81 serves as the main body of the control valve 8, provides mounting space for internal supercharging channels 85 and other components, is the key cavity for medium flow, and is internally provided with two supercharging channels 85. The supercharging channels 85 are used for passing backwashing medium and achieving supercharging, thereby enhancing the washing effect on the sensing film 702. The transmission member 84 comprises two fixed piles 841 fixedly connected to the bottom of the valve body 81. The fixed piles 841 provide a fixed mounting base for the rotation shaft 842, the clamping plate 845 and other components, thereby ensuring the structural stability of the transmission member 84. The proximal side of each fixed pile 841 is rotationally connected to a rotation shaft 842. The rotation shaft 842 serves as a rotation core component, realizes the synchronous rotation of the shut-off plate 843 and the cam 844, and transmits rotary motion. The outer side of the rotation shaft 842 is fixedly connected to the shut-off plate 843. The shut-off plate 843 changes the flow state of the fluid or backwashing medium by changing the swing state, participates in the control of the passage, and is fixedly connected to the other end of the rotation shaft 842. The cam 844 rotates with the rotation shaft 842, moves the clamping plate 845 by the contour of the cam 844, regulates the position of the clamping plate 845, and further comprises two clamping plates 845. The two ends of each clamping plate 845 are slidably connected to the inner side of the two fixed piles 841. The clamping plate 845 slides under the action of the cam 844 and the reset spring two 846, cooperates with the magnetic counterweight ring 848 to complete the linkage with the drive plug 83, and is provided with two reset spring twos 846 between the two clamping plates 845. The reset spring two 846 provides a reset elastic force for the clamping plate 845, thereby ensuring that the clamping plate 845 returns to the initial position without external force. The bottom inner side of the clamping plate 845 is magnetically connected to the magnetic counterweight ring 848. The magnetic counterweight ring 848 is connected or disconnected with the clamping plate 845 and the drive plug 83 by magnetic adsorption, participates in state switching, and is provided with a connecting spring 847 between the bottom of the clamping plate 845 and the magnetic counterweight ring 848. The connecting spring 847 provides an elastic force for the reset of the magnetic counterweight ring 848, thereby ensuring the movement reset property thereof. The bottom of the clamping plate 845 is provided with a correction plate outside the joint with the magnetic counterweight ring 848, which is used for correcting the butt joint direction of the magnetic counterweight ring 848.

[0042] The top plug 82 comprises a plurality of spring-equipped telescopic sleeves 821, the bottom of which is fixedly connected to the top of the valve body 81, and the telescopic sleeves 821 provide elastic support for the up-and-down movement of the plugging plug 822, assisting the opening and closing of the plugging plug 822. The top of the telescopic sleeve 821 is fixedly connected with the plugging plug 822 which is shaped to match the opening at the top of the valve body 81, directly closing or opening the opening at the top of the valve body 81 to control the passage. The bottom of the plugging plug 822 is provided with two sealing rings 823 which enhance the sealing between the plugging plug 822 and the valve body 81 to prevent leakage of the medium. The bottom of the plugging plug 822 is provided with a magnetic block one 824 which cooperates with the magnetic block two 835 to drive the plugging plug 822 to move by magnetic adsorption, thereby controlling the opening of the valve body.

[0043] The drive plug 83 comprises a buoyancy ball 831 which senses the presence or absence of fluid and uses buoyancy to drive the whole drive plug 83 to move, which is a sensing element for state switching. The top of the buoyancy ball 831 is fixedly provided with a connecting rod 832 which connects the buoyancy ball 831 with a sliding plug 834 to transmit the movement of the buoyancy ball 831 so that the sliding plug 834 moves synchronously. The top of the connecting rod 832 is provided with the sliding plug 834 which is slidingly connected to the bottom of the valve body 81. The sliding plug 834 moves with the connecting rod 832 to control the state of the inlet of the booster passage 85 by changing the position. The top of the sliding plug 834 is provided with a magnetic block two 835 which cooperates with the magnetic block one 824 to participate in the opening and closing control of the plugging plug 822 by magnetic adsorption or separation. The outer side of the connecting rod 832 is fixedly connected with a butt joint ring 833 which is shaped to match the inner side of the magnetic counterweight ring 848 to realize the clamping adsorption with the magnetic counterweight ring 848 to drive the drive plug 83 to move.

[0044] The measuring mechanism 7 comprises a support ring 701 mounted at the bottom of the outer cover 5, which provides a mounting and sliding base structure for the sensing film 702, ensures that the sensing film 702 stably senses the pressure, and the inner side of the support ring 701 is slidingly connected with the sensing film 702, the sensing film 702 is directly in contact with the fluid, senses the fluid pressure and deforms, which is the initial sensing component of pressure measurement, the top of the sensing film 702 is provided with a sliding arc plate 703, which slides along the slide rod 704 with the deformation of the sensing film 702, converts the deformation of the sensing film 702 into sliding displacement, a plurality of slide rods 704 are arranged inside the connection between the outer cover 5 and the support ring 701, and the inner side of the sliding arc plate 703 is slidingly connected outside the slide rod 704, the slide rod 704 provides sliding guide for the sliding arc plate 703, ensures the linearity and stability of its movement, and the outer side of the slide rod 704 is sleeved with a reset spring I 705 fixed on one side of the sliding arc plate 703, the reset spring I 705 feeds back the displacement of the sliding arc plate 703 through the elastic force, assists the transmission of pressure signal, and the connection between the outer cover 5 and the support ring 701 is provided with a flexible sealing plate 706 flush with the sliding arc plate 703, which ensures the sealing of the connection, prevents medium leakage from affecting measurement, and the measuring mechanism 7 further comprises a pressure introduction channel 707 opened in the inner part of the outer cover 5 and the bottom of the pressure analyzer 6, which communicates the measuring mechanism 7 with the pressure analyzer 6, and the inside is filled with liquid to transmit the pressure change generated by the displacement of the sliding arc plate 703, the inside of the pressure analyzer 6 is provided with a sensing cavity 708, which provides a deformation space for the isolation diaphragm 709 and is an intermediate cavity for pressure signal transmission, the inside of the sensing cavity 708 is provided with the isolation diaphragm 709, and the top of the isolation diaphragm 709 is provided with a sensitive element 710 connected with the internal circuit elements of the pressure analyzer 6, the isolation diaphragm 709 deforms under the action of the pressure transmitted by the pressure introduction channel 707, and transmits the pressure change of the filling liquid to the sensitive element 710, the sensitive element 710 captures the deformation of the isolation diaphragm 709 and converts it into an electric signal, realizes quantitative analysis of pressure, and the pressure introduction channel 707 is in communication with the sensing cavity 708 and is filled with filling liquid, which serves as a pressure transmission medium to ensure stable transmission of pressure change.

[0045] Working principle: when the pressure measurement is carried out, first of all, the fluid is introduced into the pipeline system in which the insertion tube 1 and the inner tube 2 embedded therein are located. During this process, the control valve 8 is in the initial closed state: the intercepting plate 843 is in the outward swinging state, and then the two camshafts 844 are in the transverse expansion state through the rotating shaft 842, so that the two clamping plates 845 are in the farthest distance state, and the two magnetic counterweight rings 848 are attracted to the bottom of the clamping plate 845, so that the whole driving plug 83 is in the unlocked state, and the driving plug 83 is lifted under the action of buoyancy, and the sealing plug 822 is attracted to the magnetic block 824 through the magnetic attraction of the magnetic block 2 835, so that the sealing plug 822 overcomes the spring force of the telescopic sleeve column 821 and blocks the opening at the top of the valve body 81, so that the flushing pipe 3 and the inner tube 2 are in the independent closed state.

[0046] At this time, the fluid pressure acts on the two sensing membranes 702 of the measuring mechanism 7, the sensing membranes 702 are deformed under pressure, pushing the sliding arc plate 703 at the top to slide along the slide rod 704, so that the sliding arc plate 703 on the low pressure side compresses the reset spring 1 705, while the high pressure side stretches the reset spring 1 705. The displacement of the sliding arc plate 703 transmits the pressure to the sensing cavity 708 inside the pressure analyzer 6 through the filling liquid in the pressure channel 707, pushing the isolation diaphragm 709 to deform, and the sensitive element 710 at the top of the isolation diaphragm 709 captures the deformation and converts it into an electric signal, completing the pressure detection and analysis.

[0047] After the pressure measurement is completed, the fluid conveying is stopped, the fluid in the pipeline disappears, the buoyancy of the buoyancy ball 831 disappears, the intercepting plate 843 is reset under the action of gravity and is in a natural vertical state, so that the convex edge of the cam 844 is in a vertical state through the rotation of the rotating shaft 842, the outward pressure of the cam 844 on the two clamping plates 845 is reduced, and the two clamping plates 845 are moved to the center through the action of the reset spring two 846, so that the two magnetic counterweight rings 848 are just clamped outside the docking ring 833 and are mutually adsorbed, so that the magnetic connection between the magnetic counterweight ring 848 and the bottom of the clamping plate 845 is disconnected, the magnetic counterweight ring 848 and the entire drive plug 83 form an integral whole, and under the gravity of the magnetic counterweight ring 848, the entire drive plug 83 moves downward and stretches the connecting spring 847, the connecting spring 847 is in a stretched state to facilitate the reset of the magnetic counterweight ring 848 during the plugging process, the downward movement of the drive plug 83 causes the magnetic attraction block two 835 at the top of the sliding plug 834 to separate from the magnetic attraction block one 824, and then the entire plugging plug 822 is lifted through the action of the spring inside the telescopic sleeve column 821, so that the opening at the top of the valve body 81 is opened, and because the sliding plug 834 moves downward to expose the inlet of the pressure boosting channel 85, the valve between the external connecting pipe 4 and the external conveying device is opened, so that after the backwashing medium enters the inside of the flushing pipe 3, it enters the two pressure boosting channels 85 through the valve body 81, and is backwashed to the two sensing membranes 702 through the pressure boosting effect, after the flushing is completed, the valve between the external connecting pipe 4 and the external conveying device is closed, so that the entire differential pressure transmitter can wait for the next pressure measurement and backwashing cycle.

[0048] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the foregoing embodiments of the present application are described in detail, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A plug-and-play backflushing differential pressure transmitter comprising a plug-in tube (1), characterized in that: The insertion pipe (1) is embedded with an inner pipe (2), and the top of the inner pipe (2) is provided with a flushing pipe (3), the inside of the flushing pipe (3) is provided with a control valve (8), the outside of the insertion pipe (1) is sealed and plugged with two outer cladding frames (5), the top of the two outer cladding frames (5) is provided with a pressure analyzer (6), and the inside of the outer cladding frame (5) and the pressure analyzer is provided with a measuring mechanism (7); The control valve (8) comprises a valve body (81), a top plug (82), a driving plug (83) and a transmission member (84), and two booster channels (85) are formed in the inside of the valve body (81); The transmission member (84) comprises two fixed piles (841) fixedly connected to the bottom of the valve body (81), and the proximal sides of the fixed piles (841) are rotatably connected with shafts (842), the outer sides of the shafts (842) are fixedly connected with intercepting plates (843), and the other ends of the shafts (842) are fixedly connected with cams (844); The transmission member (84) further comprises two clamping plates (845) slidably connected to the inner sides of the two fixed piles (841), two reset springs two (846) are arranged between the two clamping plates (845), a magnetic counterweight ring (848) is magnetically connected to the bottom inner side of the clamping plate (845), and a connecting spring (847) is arranged between the magnetic counterweight ring (848) and the bottom of the clamping plate (845); The measuring mechanism (7) comprises a supporting ring (701) mounted at the bottom of the outer cladding frame (5), and an induction film (702) is slidably connected to the inner side of the supporting ring (701), a sliding arc plate (703) is arranged at the top of the induction film (702), a plurality of slide rods (704) are arranged in the inside of the connecting portion of the outer cladding frame (5) and the supporting ring (701), the inner side of the sliding arc plate (703) is slidably connected to the outer side of the slide rod (704), a reset spring one (705) is arranged on the outer side of the slide rod (704) and fixed to one side of the sliding arc plate (703), and a flexible sealing plate (706) flush with the sliding arc plate (703) is arranged at the connecting portion of the outer cladding frame (5) and the supporting ring (701); The measuring mechanism (7) further comprises a pressure lead channel (707) formed in the inside of the outer cladding frame (5) and the bottom of the pressure analyzer (6), an induction cavity (708) is formed in the inside of the pressure analyzer (6), an isolation diaphragm (709) is arranged in the inside of the induction cavity (708), and a sensitive element (710) connected to the internal circuit elements of the pressure analyzer (6) is arranged at the top of the isolation diaphragm (709).

2. The plug-in backflushing differential pressure transmitter of claim 1, wherein: The top plug (82) comprises a plurality of telescopic sleeve columns (821) provided with springs in the inside, the bottom of the telescopic sleeve column (821) is fixedly connected to the top of the valve body (81), the top of the telescopic sleeve column (821) is fixedly connected with a plugging plug (822) matched with the opening shape of the top of the valve body (81), two sealing rings (823) are arranged at the bottom outer side of the plugging plug (822), and a magnetic block one (824) is mounted at the bottom of the plugging plug (822).

3. The plug-in backflushing differential pressure transmitter of claim 1, wherein: The driving plug (83) comprises a buoyancy ball (831), the top of the buoyancy ball (831) is fixed with a connecting rod (832), the top of the connecting rod (832) is provided with a sliding plug (834) which is slidingly connected to the bottom of the valve body (81), the top of the sliding plug (834) is installed with a magnetic block two (835), the outer side of the connecting rod (832) is fixedly connected with a butt joint ring (833) which is matched with the inner side shape of the magnetic counterweight ring (848).

4. The plug-in backflushing differential pressure transmitter of claim 1, wherein: The bottom of the clamping plate (845) is provided with a correction plate outside the joint with the magnetic counterweight ring (848) for correcting the butt joint direction of the magnetic counterweight ring (848).

5. The plug-in backflushing differential pressure transmitter of claim 1, wherein: The outside of the flushing pipe (3) is provided with an external connecting pipe (4), and the outer end of the external connecting pipe (4) is connected with a conveying device for conveying backwashing medium.

6. The plug-in backflushing differential pressure transmitter of claim 1, wherein: The pressure lead channel (707) is connected with the induction cavity (708) and filled with filling liquid.

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