CN204612579U - A kind of thermal power plant condenser ultrasonic for scale prevention and removal device - Google Patents

Abstract

The utility model provides an ultrasonic anti-scaling and descaling device for a condenser in a thermal power plant, which comprises an ultrasonic transducer group installed in the water chamber of the condenser and an ultrasonic generator connected with the ultrasonic generator group; the ultrasonic transducer group includes High-power ultrasonic transducers and mounting brackets; at least one high-power ultrasonic transducer is installed on the cooling tube plate in the water chamber with a mounting bracket, and the high-power ultrasonic transducers are all connected to the ultrasonic generator with transmission cables. Compared with the prior art, the device provided by the utility model realizes synchronous on-line scale prevention and descaling of the condenser, can clean the scale at any position in the condenser, and meets the requirements of different powers at the same time, greatly saving It reduces the maintenance cost of the power plant, improves the operating efficiency of the generating set, saves coal consumption, saves energy, and is non-polluting. The device occupies a small area and is easy to install, operate and maintain.

Description

An ultrasonic anti-scaling and descaling device for a thermal power plant condenser

technical field

The utility model relates to an ultrasonic anti-scaling and descaling device, in particular to an ultrasonic anti-scaling and descaling device for a condenser in a thermal power plant.

Background technique

Condenser is one of the important equipment of thermal power plant. It is a kind of heat exchange equipment that condenses the exhaust steam generated by steam turbine into water. The performance of condenser directly affects the power generation efficiency and coal consumption of power plant. Rate. There are thousands of cooling tubes in the condenser, and the cooling tubes are mainly made of materials with good heat transfer performance such as copper, titanium or stainless steel. Steam is passed through the outside of the cooling pipe, and circulating cooling water is passed through the pipe for heat exchange to achieve cooling. Calcium, magnesium ions and salts in the circulating cooling water are continuously precipitated during continuous heating, forming a large amount of scale and adhering to the wall of the cooling pipe. , due to the poor thermal conductivity of the scale, the heat transfer efficiency of the cooling pipe gradually decreases significantly with the running time, resulting in a decrease in the vacuum inside the condenser, an increase in the coal consumption rate of power generation, and an increase in power generation costs. In addition, serious fouling of cooling pipes can lead to leakage, corrosion, fouling of boilers, and even pipe bursts.

At present, the treatment method for the fouling of the cooling pipe of the condenser is shutdown cleaning, and the cooling pipe of the condenser is cleaned by pickling. In this way, the inorganic acid and corrosion inhibitor will inevitably corrode the equipment while removing the scale; at the same time, shut down Cleaning requires a lot of manpower, material and financial resources, and the economic loss caused by stopping power generation due to shutdown cleaning is also very large. Taking a 300MW unit operating at full load as an example, one hour of shutdown will reduce the power generation by 300,000 kWh. ; Although the descaling treatment method for low-power condensers can not be shut down, this existing method cannot meet the descaling requirements of high-power condensers in thermal power plants.

In view of the fact that the condenser is an indispensable equipment in a thermal power plant, the requirements for anti-scaling and descaling inside the condenser are getting higher and higher. Therefore, it is necessary to provide a method that can accurately, reliably and High-efficiency high-power online anti-scaling device.

Utility model content

In view of this, the utility model provides an ultrasonic anti-scaling and descaling device for the condenser of a thermal power plant. The device realizes the simultaneous online anti-scaling and descaling of the condenser, and can clean the scale at any position in the condenser. At the same time, it meets the requirements of different powers, greatly saves the maintenance cost of the power plant, improves the operating efficiency of the generating set, saves coal consumption, saves energy, and is non-polluting. The device occupies a small area and is easy to install, operate and maintain.

An ultrasonic anti-scaling and descaling device for a thermal power plant condenser, the anti-scaling and descaling device includes an ultrasonic transducer group installed at the water inlet end of the condenser water chamber and an ultrasonic generator located outside the condenser;

The ultrasonic transducer group is connected with the ultrasonic generator.

Preferably, the condenser is a single-flow condenser, and the ultrasonic transducer group is installed at the water inlet end of the water chamber of the single-flow condenser.

Preferably, the condenser is a double-flow condenser, and the water inlet end of the front water chamber and the water inlet end of the rear water chamber of the double-flow condenser are installed with the ultrasonic transducer group.

Preferably, the ultrasonic transducer set includes a mounting bracket and at least one high-power ultrasonic transducer;

The ultrasonic transducer group is installed on the cooling tube plate in the water chamber by the installation bracket.

Preferably, each of the high-power ultrasonic transducers is connected to the ultrasonic generator by a transmission cable.

Preferably, the high-power transducer includes a transducer unit, a sealed cylinder, and a cover for sealing the sealed cylinder, and the transducer units connected in sequence are packaged in the sealed cylinder and connected to the sealed cylinder. The axial direction of the sealing cylinder is vertical;

The axial directions of the two adjacent transducer units are vertical; the sealing cylinder is one or several connected in sequence.

Preferably, a mounting ring is sheathed on the outer wall of the sealing cylinder, and a mounting pin is provided on the outer side of the mounting ring;

The joints of the adjacent sealing cylinders are socketed by the installation ring.

Preferably, the transducer unit takes a screw as an axis, and the screw passes through two ring-shaped clamping plates, a plurality of ring-shaped piezoelectric ceramic elements arranged between the two clamping plates, and arranged at each of the two clamping plates. An annular electrode piece between the electric ceramic elements, the two ends of the screw rod are fixed by nuts; the axial length of the transducer unit is 0.1 mm to 0.5 mm larger than the inner diameter of the sealing cylinder.

Preferably, the contact surface between the splint and the inner wall of the sealing cylinder is a curved surface, and the curved surface is completely attached to the inner wall of the sealing cylinder.

It can be seen from the above technical scheme that the utility model provides an ultrasonic anti-scaling and descaling device for a thermal power plant condenser, which includes an ultrasonic transducer group installed in the water chamber of the condenser and an ultrasonic generator group connected Ultrasonic generator; the ultrasonic transducer group includes a high-power ultrasonic transducer and a mounting bracket; at least one high-power ultrasonic transducer is installed on the cooling tube plate in the water chamber with a mounting bracket, and the high-power ultrasonic transducer Both are connected with the ultrasonic generator with transmission cables. The device realizes online scale prevention and descaling for the condenser synchronously, can clean the scale at any position in the condenser, and at the same time meet the requirements of different powers, greatly saving the maintenance cost of the power plant and improving the efficiency of the generator set. High operating efficiency, saving coal consumption, saving energy, and no pollution, the device occupies a small area, and is easy to install, operate, and maintain.

Compared with the closest prior art, the technical solution provided by the utility model has the following excellent effects:

1. In the technical solution provided by the utility model, the on-line anti-scaling and descaling of the condenser are realized synchronously, and the scale at any position in the condenser can be cleaned, and the use requirements of different powers are met at the same time, which greatly saves power generation The maintenance cost of the plant can be improved, the operating efficiency of the generator set can be improved, coal consumption can be saved, energy can be saved, and there is no pollution. The device occupies a small area and is easy to install, operate and maintain.

2. In the technical solution provided by the utility model, the ultrasonic transducer group is installed in the water chamber of the condenser, which reduces the energy loss of the ultrasonic transducer when in contact with the air, thereby reducing the loss of ultrasonic energy; at the same time, The transducer can be installed in any position of the water chamber, and the treatment is more uniform, greatly reducing the processing blind area; in addition, since the heat generated by the transducer is taken away by water, the transducer can work at room temperature. At the same time, the number of ultrasonic transducers of the same type can be increased or decreased according to the processing requirements, which is convenient for replacement and maintenance, and improves the processing efficiency of the anti-scaling and descaling device.

3. In the technical solution provided by the utility model, the anti-scaling and descaling device can be applied to a single-flow condenser or a double-flow condenser, which meets the anti-scaling and descaling requirements of different types and structures of condensers, so that The applicability of the anti-scaling and descaling device is better.

4. In the technical solution provided by the utility model, the installed bracket is more convenient for the disassembly and maintenance of the ultrasonic transducer. At the same time, the condensers with different power and descaling and anti-scaling requirements can be installed on the Different numbers of ultrasonic transducers, thereby improving the operating efficiency of the anti-scaling and descaling device, ensuring the reliability of power generation in thermal power plants

5. In the technical solution provided by the utility model, the adjacent transducer units are arranged vertically in the axial direction, and the transducer units extended to four sides increase the radiation range of the transducer and improve the operation of the high-power transducer Efficiency, more uniform treatment, reduced treatment blind spots, thus improving the operating efficiency of the anti-scaling and descaling device.

6. In the technical solution provided by the utility model, the sealing cylinder is set as one or multiple connected in sequence, so that the high-power transducer in the ultrasonic transducer group can be adjusted according to the width of the cooling tube plate in the condenser. It can be set to different lengths without re-changing the model of a single high-power transducer, only through the connection of multiple sealing cylinders; it improves the adaptability of the anti-scaling and descaling device, saves time and money costs and The operating efficiency of the anti-scaling and descaling device is improved.

7. In the technical solution provided by the utility model, by setting the mounting ring on the outer wall of the sealing cylinder, the outside of the mounting ring is provided with mounting pins and the joints of adjacent sealing cylinders are socketed with the mounting ring; so that the sealing cylinders The connection is tighter and more reliable. The setting of the mounting pin allows the sealing cylinder to be installed at any position on the mounting frame, which facilitates the disassembly and installation of a single high-power transducer, and improves the sealing reliability of a single high-power transducer. ; And then improve the operational reliability of the anti-scaling and descaling device.

8. In the technical solution provided by the utility model, the axial length of the transducer unit is 0.1mm to 0.5mm greater than the inner diameter of the sealing cylinder; after the transducer unit is added into the sealing cylinder, the sealing cylinder can be stretched, Therefore, the connection between the sealing cylinder and the transducer unit is more tightly and effectively, thereby improving the sealing performance and reliability of the anti-scaling and descaling device.

9. In the technical solution provided by the utility model, the contact surface between the splint and the inner wall of the sealing cylinder is a curved surface, so that the curved surface and the inner wall of the sealing cylinder can be completely attached, so that the connection between the sealing cylinder and the transducer unit is more tightly and effectively, and then The sealing performance and reliability of the anti-scaling and descaling device are improved.

10. Among the technical solutions provided by the utility model, they are widely used and have remarkable social and economic benefits.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of installation of an ultrasonic anti-scaling and descaling device for a thermal power plant condenser of the present invention in a single-flow condenser.

Fig. 2 is a flow chart of the anti-scaling and descaling device of the present invention in the circulating cooling water of the single-flow condenser.

Fig. 3 is a schematic front view of the anti-scaling and descaling device of the present invention in the front water chamber of the single-flow condenser.

Fig. 4 is a schematic diagram of the installation of the anti-scaling and descaling device of the present invention in a double-flow condenser.

Figure 5 is a flow chart of the dual-flow condenser circulating cooling water.

Fig. 6 is a structural schematic diagram of a high-power transducer of a sealed cylinder in the anti-scaling and descaling device of the present invention.

Fig. 7 is a structural schematic diagram of a plurality of high-power transducers of sealed cylinders connected in sequence in the anti-scaling and descaling device of the present invention.

Fig. 8 is a schematic cross-sectional structure diagram of the ultrasonic transducer in the anti-scaling and descaling device of the present invention.

Fig. 9 is a structural schematic diagram of the transducer unit of the ultrasonic transducer in the anti-scaling and descaling device of the present invention.

Fig. 10 is a schematic diagram of the ultrasonic generator of the present invention.

Among them, 1—ultrasonic generator, 2—high-power ultrasonic transducer, 201—piezoelectric ceramic element, 202—electrode sheet, 203—cover plate, 204—splint, 205—screw, 206—nut, 3—transmission cable , 4—installation bracket, 5—water chamber, 501—front water chamber, 502—rear water chamber, 6—cooling tube plate, 7—cooling pipe, 8—water inlet pipe, 9—water outlet pipe, 10—transducer unit , 11—sealing cylinder, 12—explosion-proof joint, 13—connection of adjacent sealing cylinders, 14—installation ring, 15—installation pin.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

As shown in Figures 1 to 3, taking the anti-scaling and descaling device in the single-flow condenser as an example, the utility model provides an ultrasonic anti-scaling and descaling device for the condenser of a thermal power plant, including The ultrasonic transducer group at the water inlet end in the water chamber of the condenser and the ultrasonic generator 1 connected with the ultrasonic generator 1 group and located outside the condenser.

Among them, in the water chamber 5 of the single-flow condenser, the water extends into the water pipe 8, enters the cooling pipe 7 from the water inlet end, and flows out through the water outlet pipe 9; the inlet end of the water chamber 5 of the condenser is equipped with an ultrasonic transducer The ultrasonic transducer group includes two high-power ultrasonic transducers 2; the mounting bracket 4 is installed on the cooling tube plate 6 of the condenser; the ultrasonic transducer 2 is installed and fixed on the mounting bracket 4, each The high-power ultrasonic transducers 2 are connected with a transmission cable 3, one end of the transmission cable 3 is connected to the high-power ultrasonic transducer 2, and the other end of the transmission cable 3 passes through the condenser and is connected to the ultrasonic generator 1.

Wherein, the number of high-power ultrasonic transducers 2 can be set to one or more as required, and the ultrasonic transducer group can also be installed at the inlet port in the water chamber 5 or at the same time in the water chamber 5 as required. The inlet port and the outlet port in the water chamber 5, that is, the high-power ultrasonic transducer 2 can be respectively installed on the cooling tube plate 6 at both ends of the cooling tube 7 through two mounting brackets 4 .

The ultrasonic generator 1 converts the input AC 380V or 220V AC into an ultrasonic electric power signal that is consistent with the operating frequency of the high-power ultrasonic transducer 2, and the electric power signal is connected to a large Power ultrasonic transducer 2, high-power ultrasonic transducer 2 converts the ultrasonic electric power signal into ultrasonic mechanical energy and radiates it to the circulating cooling water in the condenser. The ultrasonic anti-scaling and descaling device works continuously on-line and utilizes , activation, shearing, inhibition and other effects enable the condenser to achieve the purpose of scale prevention and descaling.

As shown in Figures 4 to 5, taking the anti-scaling and descaling device in the double-flow condenser as an example, the utility model provides an ultrasonic anti-scaling and descaling device for the condenser of a thermal power plant, including The water inlet end of the front water chamber 501 and the ultrasonic transducer group of the water inlet end in the rear water chamber 502 and the ultrasonic generator 1 connected with the ultrasonic generator 1 group and located outside the condenser.

Among them, in the front water chamber 501 of the double-flow condenser, the water extends into the water pipe 8, enters the cooling pipe 7 from the water inlet end, and reaches the water outlet end of the back water chamber 502 of the double-flow condenser. The water inlet end of 502 enters in the cooling pipe 7, and after reaching the water outlet end of the front water chamber 501, it flows out through the water outlet pipe 9; The ultrasonic transducer group, the ultrasonic transducer group includes 3 high-power ultrasonic transducers 2; the mounting bracket 4 is installed on the cooling tube plate 6 of the condenser; the ultrasonic transducer 2 is installed and fixed on the mounting bracket 4, Each high-power ultrasonic transducer 2 is connected with a transmission cable 3, one end of the transmission cable 3 is connected to the high-power ultrasonic transducer 2, and the other end of the transmission cable 3 passes through the condenser and is connected to the ultrasonic generator 1 .

Wherein, the number of high-power ultrasonic transducers 2 can be set to 1 or more as required, generally within 6, and the transducer unit in each high-power ultrasonic transducer 2 can be set to 2 or multiples of 2, generally no more than 10. Ultrasonic transducer group also can be installed in the water inlet end in the front water chamber 501 and the water inlet end in the front water chamber 502 as required, or be installed in the water inlet end and the water outlet end in the front water chamber 501, in the rear water chamber 502 at the same time The water inlet end and the water outlet end, that is, the high-power ultrasonic transducer 2 can be respectively installed on the cooling tube plate 6 at the two ends of the cooling tube 7 through 2 to 4 mounting brackets 4 .

The ultrasonic generator 1 converts the input AC 380V or 220V AC into an ultrasonic electric power signal that is consistent with the operating frequency of the high-power ultrasonic transducer 2, and the electric power signal is connected to a large Power ultrasonic transducer 2, high-power ultrasonic transducer 2 converts the ultrasonic electric power signal into ultrasonic mechanical energy and radiates it to the circulating cooling water in the condenser. The ultrasonic anti-scaling and descaling device works continuously on-line and utilizes , activation, shearing, inhibition and other effects enable the condenser to achieve the purpose of scale prevention and descaling.

As shown in Figures 6 to 7, the high-power transducer 2 of the present invention includes a plurality of transducer units 10 connected in sequence, a sealing cylinder 11 for encapsulating the transducer units 10 and perpendicular to its axial direction, and a radius and Sealing caps with equal inner radii of the sealing cylinder 11;

The axial directions of two adjacent transducer units 10 are vertical;

There is one sealing cylinder 11 or a plurality of sequentially connected ones. Wherein, the number of connections of the sealing cylinder 11 can be set to more than one as required.

A mounting ring 14 is sheathed on the outer wall of the sealing cylinder 11, and a mounting pin 15 is provided on the outside of the mounting ring 14;

The joints 13 of the adjacent sealing cylinders 11 are socketed by the mounting ring 14 .

As shown in Figures 8 to 9, the transducer unit 10 takes the screw rod 205 as the axis, and the screw rod 205 passes through two ring-shaped clamping plates 204, a plurality of ring-shaped piezoelectric ceramic elements 201 arranged between the two clamping plates 204, and the setting The two ends of the ring electrode piece 202 between every two piezoelectric ceramic elements 201 and the screw rod 205 are fixed with nuts 206 .

Wherein, the contact surface between the splint 204 and the inner wall of the sealing cylinder 11 is a curved surface, and the curved surface is completely attached to the inner wall of the sealing cylinder 11 .

The axial length of the transducer unit 10 is 0.1 mm to 0.5 mm larger than the inner diameter of the sealing cylinder 11 .

The sealing cylinder 11 and the mounting ring 14 are made of alloy.

The cover includes two circular cover plates 203, one of which is provided with a through hole at the center of the circle of the cover plate 203 to allow the transmission cable 3 to pass through, and an explosion-proof joint 12 is provided between the through hole and the transmission cable 3;

The two cover plates 203 are respectively installed at both ends of one or more sealing cylinders 11 connected in sequence.

The electrode sheets 202 are all connected to one end of the transmission cable 3 , and the other end of the transmission cable 3 is connected to the ultrasonic generator 1 .

As shown in Figure 10, the maximum continuous power of a single high-power ultrasonic generator 1 can reach 10KW. The main control circuit is designed with a high-performance, low-power ARM Cortex-M core micro-control chip, uses multi-sensors to detect various data of the system, and uses digital signal processing technology to analyze the changes of the transducer 2 and the acoustic load. The transducer can achieve the ideal working condition in the continuously changing load environment. The output frequency and power are controlled by the digital system for its frequency setting, tracking compensation, amplitude setting, amplification matching output, and signal detection and analysis. The ultrasonic generator 1 in this case has the characteristics of high precision, intuitive display, high degree of intelligence, flexible control, good reliability and stability, and small size.

The main principle of ultrasonic scale prevention and descaling in power plant condensers is as follows:

1. Cavitation effect

The ultrasonic energy of the ultrasonic transducer 2 radiates into the cooling circulating water, causing a large number of cavities and bubbles in the water. When these cavities and bubbles burst or squeeze each other, a strong pressure peak will be generated, causing the scale-forming substances to be pulverized and suspended. In the water, it breaks the formed scale layer and makes it easy to fall off.

2. Activation effect

Ultrasonic waves split water molecules into H free radicals and HO free radicals, even H+ and OH- through the cavitation effect in cooling circulating water, while OH and scale-forming substance ions can form such as Ca(OH)2, Mg(OH) 2 and other complexes, so as to increase the solubility of water, so that its scale dissolution ability is relatively improved, and it has an activation effect. That is to say, ultrasonic waves can increase the activity of flowing liquid and scaling substances, increase the release of microcrystalline nuclei of scaling substances wrapped in water molecules, destroy the conditions for the survival of scales and adhere to the pipe wall, and make the scaling substances Dispersed deposits are formed in the water without forming hard scale on the pipe wall, thus playing the role of scale prevention.

3. Shearing effect

The ultrasonic vibration acting on the metal surface generates mechanical energy, which makes the metal, scale, and water vibrate accordingly. Due to the different frequency responses among the three, asynchronous vibration is generated. Because the properties and elastic impedance of the scale are different from those of metal, Therefore, a high-speed relative movement is generated, forming a relative shear force on the interface between the scale layer and the pipe wall, that is, a shear effect is formed, which destroys the bond between the scale and the metal, and causes the scale layer to fatigue, crack, loose, break and fall off , so as to play a role in descaling.

4. Inhibition effect

Through the action of ultrasonic waves, the physical and chemical properties of the liquid body are changed, the nucleation induction period of the fouling substances is shortened, and the generation of tiny crystal nuclei is stimulated. These newly generated tiny crystal nuclei, due to their small size, light weight, and large specific surface area, are suspended in the liquid and form an interface much larger than the wall surface. Nucleation and growth allow the grains of a given structure to grow, thereby reducing the number of scaling ions adhering to the heat transfer surface, thereby reducing the deposition rate of scaling.

5. High-speed micro-vortex effect

When the ultrasonic wave propagates in the metal tube and plate wall, a highly accelerated shock wave is generated, which causes the liquid in contact with the interface to generate a high-speed micro-vortex, which hinders the adhesion of scaling, crystallization, fouling and other substances, and at the same time cleans the metal interface to play a role It has the dual function of anti-scale and descale.

The above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit it. Although the utility model has been described in detail with reference to the above examples, those of ordinary skill in the art can still modify the specific implementation of the present utility model Or equivalent replacements, and any modification or equivalent replacements that do not depart from the spirit and scope of the present invention are all within the protection scope of the claims of the pending application of the present invention.

Claims (9)

1. a thermal power plant condenser ultrasonic anti-scaling and descaling device is characterized in that, said anti-scaling and descaling device comprises an ultrasonic transducer group installed at the water inlet end of the condenser water chamber and an ultrasonic transducer group positioned at the outside of the condenser ultrasonic generator; The ultrasonic transducer group is connected with the ultrasonic generator. 2. The anti-scaling and descaling device according to claim 1, wherein the condenser is a single-flow condenser, and the water inlet end of the water chamber of the single-flow condenser is equipped with the ultrasonic transducer device group. 3. anti-scaling and descaling device as claimed in claim 1, is characterized in that, described condenser is double flow condenser, and the water inlet end of the front water chamber of described double flow condenser and the water inlet in back water chamber The ultrasonic transducer group is installed at the water inlet end. 4. The anti-scaling and descaling device according to any one of claims 1 to 3, wherein the ultrasonic transducer group includes a mounting bracket and at least one high-power ultrasonic transducer; The ultrasonic transducer group is installed on the cooling tube plate in the water chamber by the installation bracket. 5. The anti-scaling and descaling device according to claim 4, characterized in that, each of the high-power ultrasonic transducers is connected to the ultrasonic generator with a transmission cable. 6. anti-scaling and descaling device as claimed in claim 4, is characterized in that, described high-power transducer comprises transducer unit, seal cylinder and the cover that is used to seal described seal cylinder, all connected successively The transducer unit is packaged in the sealed cylinder and is perpendicular to the axial direction of the sealed cylinder; The axial directions of the two adjacent transducer units are vertical; the sealing cylinder is one or several connected in sequence. 7. The anti-scaling and descaling device according to claim 6, wherein an installation ring is set on the outer wall of the sealing cylinder, and an installation pin is arranged on the outside of the installation ring; The joints of the adjacent sealing cylinders are socketed by the installation ring. 8. The anti-scaling and descaling device according to claim 6 or 7, wherein the transducer unit takes a screw as an axis, and the screw passes through two annular splints and is arranged between the two splints A plurality of ring-shaped piezoelectric ceramic elements and ring-shaped electrode sheets arranged between every two piezoelectric ceramic elements, the two ends of the screw rod are fixed with nuts; the axial length of the transducer unit is greater than The inner diameter of the sealing cylinder is 0.1 mm to 0.5 mm. 9. The anti-scaling and descaling device according to claim 8, characterized in that, the contact surface between the splint and the inner wall of the sealing cylinder is a curved surface, and the curved surface is completely attached to the inner wall of the sealing cylinder.