A device for cleaning the inlet of the heating element of a voltage regulator electric heater.

Abstract

The present invention belongs to the field of nuclear power plant maintenance technology, and specifically relates to a device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, the device comprising: an alloy cutter head and a fixture, the alloy cutter head comprising: a blade surface, a chip removal groove and a cutter seat, the fixture comprising: a bayonet seat, a connecting rod and a chuck; the alloy cutter head is located above the fixture, multiple groups of spiral chip removal grooves are evenly arranged on the outer edge of the alloy cutter head, multiple groups of blade surfaces are evenly arranged on the upper end face of the alloy cutter head, the cutter seat is connected to the lower end face of the alloy cutter head; the bayonet seat is connected to the upper end of the connecting rod, the chuck is connected to the lower end of the connecting rod; the cutter seat and the bayonet seat are detachably connected. The device of the present invention can quickly clean the sealing material in the pipe opening of the electric heating element without damaging the terminal or other obstacles welded at the end of the lead rod, saving time and effort.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power station maintenance, and in particular relates to a device for cleaning a pipe opening of an electric heating element of a voltage stabilizer electric heater. Background Art

[0002] During the operation of a nuclear power plant, the pressurizer electric heater is installed on the pressurizer in the reactor coolant system to heat the coolant in the pressurizer to meet the saturation temperature of the operating pressure, thereby controlling and regulating the pressure fluctuations of the reactor coolant system.

[0003] Due to the different reactor types, the structure of the pressurizer electric heater is also different. In the VVER reactor type, the pressurizer electric heater is a flange immersion electric heater, which is mainly composed of multiple U-shaped electric heating elements and metal flanges. The U-shaped electric heating elements pass through the mounting holes on the metal flange, are welded and sealed at the connection position, and the ends of the elements are sealed with high-temperature resistant resin glue. When the unit is running, the ambient temperature of the pressurizer heater is high. Under high temperature conditions, the resin sealant is prone to aging and failure, and loses its sealing performance, resulting in a decrease in the insulation performance of the pressurizer electric heater. In order to restore the insulation performance of the pressurizer electric heater, the aged resin sealant needs to be removed. However, the operating space of the pipe mouth of the pressurizer electric heater element is extremely small, and the end of the lead rod is welded with a terminal, which cannot be cleaned using a conventional electric powder digging device. Secondly, the resin sealant has a high adhesion, and it is extremely difficult to clean it using a traditional probe, which is time-consuming and labor-intensive. At the same time, the cleaning effect is poor, which affects the insulation recovery effect.

[0004] Therefore, there is an urgent need for an electric heating element pipe opening cleaning device that is convenient and quick to install and use, has a compact and reasonable structure, is efficient, safe and reliable. Summary of the invention

[0005] The purpose of the present invention is to provide a device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, which can quickly clean the sealing material in the pipe opening of the electric heating element without damaging the wiring terminals welded at the end of the lead rod or other obstacles, thus saving time and effort.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, the device comprising: an alloy cutter head and a fixture, the alloy cutter head comprising: a blade surface, a chip removal groove and a cutter seat, the fixture comprising: a bayonet seat, a connecting rod and a chuck; the alloy cutter head is located above the fixture, a plurality of groups of spiral chip removal grooves are evenly arranged on the outer edge of the alloy cutter head, a plurality of groups of blade surfaces are evenly arranged on the upper end surface of the alloy cutter head, the cutter seat is connected to the lower end surface of the alloy cutter head; the bayonet seat is connected to the upper end of the connecting rod, and the chuck is connected to the lower end of the connecting rod; the cutter seat and the bayonet seat are detachably connected.

[0008] The knife seat is provided with a mounting hole, the upper end surface of the bayonet pin seat is connected with a bayonet pin, the mounting hole matches the bayonet pin, and the mounting hole and the bayonet pin are detachably connected.

[0009] The outer side of the alloy cutter head is provided with a mounting groove which penetrates the alloy cutter head.

[0010] The connecting rod is in an arcuate shape.

[0011] A protection pad is installed on the side of the bayonet pin on the bayonet pin seat.

[0012] The protective pad is made of polytetrafluoroethylene.

[0013] The chuck is provided with parallel horizontal grooves, which match the jaws of the electric rotary tool.

[0014] The connecting rod is evenly provided with counterweight and weight-reducing holes.

[0015] The alloy cutter head and the fixture are made of alloy steel and stainless steel.

[0016] The blade surface is inlaid with an alloy with extremely high hardness.

[0017] The beneficial technical effects of the present invention are:

[0018] 1. The present invention provides a device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, which is mainly made of alloy material, has stable performance, is durable, has a long service life, and is maintenance-free.

[0019] 2. The present invention provides a device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, which is convenient and quick to install and use, has a compact and reasonable structure, and is safe and reliable.

[0020] 3. The device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater provided by the present invention solves the problem of difficulty in cleaning the sealing material of the pipe opening of the electric heating element and poor cleaning effect.

[0021] 4. The device for cleaning the pipe opening of the electric heating element of the voltage stabilizer electric heater provided by the present invention can quickly clean the sealing material of the pipe opening of the electric heating element, thereby improving the maintenance efficiency and saving a lot of labor costs.

[0022] 5. The device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater provided by the present invention has multiple protection functions, which can prevent damage to the pipe opening welding and sealing position during the cleaning operation of the element pipe opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a device for cleaning a pipe opening of an electric heating element of a voltage stabilizer electric heater provided by the present invention;

[0024] Figure 2A left view of a device for cleaning a pipe opening of an electric heating element of a voltage stabilizer electric heater provided by the present invention;

[0025] Figure 3 The present invention provides a top view of a device for cleaning a pipe opening of an electric heating element of a voltage stabilizer electric heater.

[0026] In the figure: 1-alloy cutter head; 2-clamp; 3-blade surface; 4-chip groove; 5-tool holder; 6-protection pad; 7-pin; 8-pin seat; 9-connecting rod; 10-chuck; 11-installation slot; 12-counterweight and weight-reducing hole. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1-3 As shown, the present invention provides a device for cleaning the pipe orifice of an electric heating element of a voltage stabilizer electric heater, comprising: an alloy cutter head 1 and a fixture 2, the alloy cutter head 1 comprising: a blade surface 3, a chip removal groove 4, a cutter seat 5, and a mounting groove 11, the fixture 2 comprising: a protective pad 6, a bayonet pin 7, a bayonet pin seat 8, a connecting rod 9, a chuck 10 and a counterweight and weight-reducing hole 12.

[0029] like Figure 1-3 As shown, the alloy cutter head 1 and the fixture 2 are made of alloy steel and stainless steel, and the alloy cutter head 1 is located above the fixture 2. The alloy cutter head 1 is cylindrical in shape, and multiple groups of spiral chip grooves 4 are evenly arranged on the outer edge of the alloy cutter head 1; multiple groups of blade faces 3 are evenly arranged on the upper end face of the alloy cutter head 1, and the blade face 3 takes the center of the circle as the midpoint. The blade face 3 is inlaid with an alloy with extremely high hardness, such as tungsten-cobalt cemented carbide, tungsten-titanium-cobalt cemented carbide, and nickel-molybdenum-titanium alloy to prevent the blade from collapsing during rotary cutting; the cutter seat 5 is connected to the lower end face of the alloy cutter head 1, and a mounting circular hole is opened on the cutter seat 5; a through mounting groove 11 is opened on the outer side of the alloy cutter head 1, which is convenient for the alloy cutter head to pass through the lead-out rod of the electric heating element and be inserted into the pipe mouth.

[0030] like Figure 1-2 As shown, the fixture 2 is in the shape of an arch, and the bayonet seat 8 and the chuck 10 are connected by the arch connecting rod 9. The bayonet seat 8 is connected to the upper end of the arch connecting rod 9, and the upper end surface of the bayonet seat 8 is connected with the bayonet 7, and the mounting hole matches the bayonet 7. The diameter of the mounting hole is slightly larger than the diameter of the bayonet 7. The mounting hole of the tool holder 5 is matched with the bayonet 7 and installed to transmit torque, so that the tool holder 5 of the alloy tool head 1 and the bayonet seat 8 of the fixture 2 can be detachably connected. A polytetrafluoroethylene protective pad 6 is installed on the side of the bayonet 7 on the bayonet seat 8 to prevent the nozzle of the electric heating element from being damaged when the fixture 2 rotates at high speed. The chuck 10 is connected to the lower end of the arch connecting rod 9, and two horizontal grooves are opened on the chuck 10, which match the claws of the electric rotary tool to facilitate the grip of the electric tool chuck. A plurality of weight-reducing holes 12 for weight reduction and balancing are evenly opened on the arch connecting rod 9.

[0031] A through circular hole is reserved in the spiral middle of the alloy cutter head 1 for the lead-out rod of the electric heating element to pass through.

[0032] The multiple groups of spiral chip removal grooves 4 on the outside of the alloy cutter head 1 have smooth transitions, which can easily and quickly dig out the sealant in the electric heating element tube without damaging the metal shell of the electric heating element;

[0033] The spiral outer side of the alloy cutter head 1 has been polished for many times, and the surface is smooth and flat, so it will not cause damage to the metal shell of the electric heating element when rotating at high speed.

[0034] The connecting rod 9 in the middle of the clamp 2 is bow-shaped, and the cleaning device can avoid the connecting terminals on the lead-out rod of the electric heating element when it rotates as a whole; a plurality of counterweight holes 12 are opened on the bow-shaped connecting rod 9, so that alloy cutter heads 1 of different specifications can be matched with the clamp 2 to offset the jitter of the irregularly shaped alloy cutter head 1 when it rotates at high speed.

[0035] The working steps of the device for cleaning the pipe opening of the electric heating element of the voltage stabilizer electric heater provided by the present invention are as follows:

[0036] Step 1: Insert the chuck 10 of the clamp 2 into the jaws of the electric rotary tool and tighten it.

[0037] Step 2: snap the mounting groove 11 of the alloy cutter head 1 into the connecting terminal on the lead-out rod of the electric heating element and push it forward.

[0038] Step 3: Insert the bayonet pin 7 of the fixture 2 into the mounting hole on the cutter head seat 5.

[0039] Step 4: Turn on the electric rotary tool and push it forward to complete the pipe opening cleaning.

[0040] Step 5: Use compressed air to blow out the dust in the pipe.

[0041] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater, characterized in that: The device comprises: an alloy cutter head (1) and a fixture (2); the alloy cutter head (1) comprises: a cutting edge (3), a chip removal groove (4) and a cutter seat (5); the fixture (2) comprises: a bayonet seat (8), a connecting rod (9) and a chuck (10); the alloy cutter head (1) is located above the fixture (2); a plurality of groups of spiral chip removal grooves (4) are evenly arranged on the outer edge of the alloy cutter head (1); a plurality of groups of cutting edges (3) are evenly arranged on the upper end surface of the alloy cutter head (1); the cutter seat (5) is connected to the lower end surface of the alloy cutter head (1); the bayonet seat (8) is connected to the upper end of the connecting rod (9); the chuck (10) is connected to the lower end of the connecting rod (9); the cutter seat (5) and the bayonet seat (8) are detachably connected; The knife seat (5) is provided with a mounting hole, the upper end surface of the bayonet seat (8) is connected with a bayonet (7), the mounting hole matches the bayonet (7), the bayonet (7) is inserted into the mounting hole on the knife head seat (5), and the mounting hole and the bayonet (7) are detachably connected; A protective pad (6) is installed on the side of the bayonet pin (7) on the bayonet pin seat (8); The connecting rod (9) is in an arched shape, and the cleaning device can avoid the connection terminal on the lead-out rod of the electric heating element when the cleaning device rotates as a whole; The alloy cutter head (1) is provided with a through installation groove (11) on the outside, so that the alloy cutter head can pass through the electric heating element lead-out rod and be inserted into the pipe mouth. When cleaning, the installation groove (11) of the alloy cutter head (1) is buckled with the connection terminal on the electric heating element lead-out rod; The spiral middle of the alloy cutter head (1) is provided with a through circular hole for the lead-out rod of the electric heating element to pass through; The chuck (10) is provided with parallel horizontal grooves, which match the jaws of the electric rotary tool.

2. A device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater according to claim 1, characterized in that: The protective pad (6) is made of polytetrafluoroethylene.

3. The device for cleaning the pipe opening of the electric heating element of the voltage stabilizer electric heater according to claim 1, characterized in that: The connecting rod (9) is evenly provided with counterweight holes (12).

4. The device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater according to claim 1, characterized in that: The alloy cutter head (1) is made of alloy steel, and the clamp (2) is made of stainless steel.

5. The device for cleaning the pipe opening of an electric heating element of a voltage stabilizer electric heater according to claim 1, characterized in that: The blade surface (3) is inlaid with a high-hardness alloy.

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