Pump casing flow channel coating device

Abstract

The utility model discloses a pump casing flow channel coating device, which includes a vehicle body, a coating unit and a traction member for driving the vehicle body; the traction member is connected to the vehicle body, the coating unit is arranged on the vehicle body and moves with the vehicle body; the coating unit includes a rotating drum and a paint delivery unit, the paint delivery unit includes an input end for inputting paint and an output end for outputting paint, and the rotating drum is arranged at the periphery of the output end of the paint delivery unit. The coating unit is driven by the vehicle body to move in the curved outer flow channel inside the pump casing, and the paint outputted by the paint delivery unit can be evenly coated on the outer flow channel wall surface inside the pump casing under the centrifugal force generated by the self-rotation of the rotating drum, thereby completing the internal coating of the double-flow channel pump casing.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid delivery pumps, in particular to a pump housing flow channel coating device. Background Art

[0002] The nuclear power plant's important plant water system (SEC) uses a double-channel seawater delivery pump, which is used to deliver seawater to the downstream heat exchanger to cool the nuclear island equipment. It is a nuclear safety-related system. However, the pump casing of the double-channel seawater delivery pump is cast, and there is a large inaccessible area on the inner surface during the casting process. Comprehensive non-destructive inspection cannot be performed during the manufacturing process, and casting defects such as slag inclusions, pores, and looseness are inevitable. During the service of the pump casing, pitting corrosion occurs due to the interaction between seawater and the casting defects on the pump casing surface. As the service time increases, the pitting corrosion further intensifies, eventually forming a penetrating channel and leaking on the outer surface of the pump casing.

[0003] Due to the special structure of the double-channel seawater delivery pump, there is no repair method suitable for the double-channel pump casing of a nuclear power plant in the prior art. After the pump casing leaks, it is usually directly replaced with a new pump casing. However, the replacement cost is high, the replacement and manufacturing cost of a single pump casing is high, and the manufacturing cycle is long. In addition, due to the limitations of the casting process, replacing a new pump casing cannot completely solve the problems of casting defects such as slag inclusions, air holes, and looseness. In order to reduce the risk of pump casing leakage and extend the service life of the pump casing, one solution is to spray an anti-corrosion coating on the inside of the pump casing. However, because the internal flow channel of the double-channel seawater delivery pump is curved and irregular, there are many blind spots that conventional pipeline spraying tools cannot reach. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pump casing flow channel coating device in view of at least one defect of the above-mentioned prior art.

[0005] The utility model solves the technical problem by adopting a technical solution: providing a pump housing flow channel coating device, which comprises a vehicle body, a coating unit and a traction member for driving the vehicle body;

[0006] The traction member is connected to the vehicle body, and the coating unit is arranged on the vehicle body and moves with the vehicle body;

[0007] The spin coating unit comprises a rotating drum and a paint conveying unit, wherein the paint conveying unit comprises an input end for inputting paint and an output end for outputting paint, and the rotating drum is arranged at the periphery of the output end of the paint conveying unit.

[0008] Preferably, a magnet is provided on the vehicle body.

[0009] Preferably, the vehicle body comprises a first part and a second part which are rotatably connected, the coating unit is connected to the first part, and the traction member is connected to the second part.

[0010] Preferably, the first part includes a first base and a first connecting part connected to each other, the second part includes a second base and a second connecting part connected to each other, the spin-coating unit is connected to the first base, and the traction member is connected to the second base; one of the first connecting part and the second connecting part includes a rotating shaft, and the other includes an axial hole adapted to the rotating shaft.

[0011] Preferably, the spin-coating unit further comprises a driving motor, and the driving motor is drivingly connected to the rotating drum.

[0012] Preferably, the spin coating unit further comprises a bearing, a support seat is provided on the vehicle body, and the bearing is fixedly connected to the support seat;

[0013] The driving motor comprises a motor body and an output shaft connected to each other, wherein the motor body and the rotating drum are respectively located on opposite sides of the supporting seat; the output shaft is coaxially connected to the bearing, and one end of the output shaft away from the motor body is drivingly connected to the rotating drum.

[0014] Preferably, a first through hole is provided on the support seat, and the output end of the coating material conveying unit is passed through the first through hole.

[0015] Preferably, the traction member is a flexible rod.

[0016] Preferably, the traction member is a glass fiber rod.

[0017] Preferably, the paint delivery unit is tubular;

[0018] And / or, the rotating drum is provided with a plurality of second through holes along its circumference.

[0019] The utility model has at least the following beneficial effects: the coating unit is driven by the vehicle body to move in the curved outer flow channel inside the pump casing, and the paint output through the paint delivery unit can be evenly coated on the wall surface of the outer flow channel inside the pump casing under the action of the centrifugal force generated by the rotation of the drum, thereby completing the internal coating of the double-channel pump casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of a double-channel pump casing;

[0022] Figure 2It is a three-dimensional structural schematic diagram of a pump casing flow channel coating device in some embodiments of the utility model;

[0023] Figure 3 yes Figure 2 The schematic diagram of the three-dimensional structure of the pump casing flow channel coating device after partial decomposition is shown;

[0024] Figure 4 yes Figure 3 The three-dimensional structural schematic diagram of the pump casing flow channel coating device from another perspective is shown. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the pump casing of the seawater delivery pump with a dual-channel structure adopted by SEC is an integrally cast duplex stainless steel pump casing, the interior of which is defined by an outer channel 41 and an inner channel 42 through a middle partition 40. The inlet 401 of the outer channel 41 is square, and the outlet 402 of the outer channel 41 is similar to a D-shape. The total length of the outer channel 41 is about 1.7m. Conventional pipeline spraying tools are difficult to pass through curved channels, so it is necessary to develop a new device to achieve the coating of anti-corrosion paint on the inside of the dual-channel pump casing, thereby extending the service life of the pump casing. The pump casing flow channel coating device of the utility model can be used for internal coating of dual-channel pump casings, and can also be used for internal coating of pump casings of other structural forms.

[0027] like Figures 2 to 4 As shown, a pump casing flow channel coating device (hereinafter referred to as coating device) of an embodiment of the utility model includes a vehicle body 1, a coating unit and a traction member 3 for driving the vehicle body 1. The vehicle body 1 has wheels 13, which can move in the flow channel of the pump casing. The wheels 13 can be rubber wheels. The traction member 3 is connected to the vehicle body 1, and the coating unit is arranged on the vehicle body 1 and moves with the vehicle body 1. That is, the operator can control the vehicle body 1 to move in the pump casing flow channel by manipulating the traction member 3, and the coating unit on the vehicle body 1 moves in the pump casing flow channel together with the vehicle body 1.

[0028] The spin coating unit includes a rotating drum 21 and a paint delivery unit 22. The paint delivery unit 22 includes an input end for inputting paint and an output end 220 for outputting paint. The input end of the paint delivery unit 22 can be used to input coating paint, for example, high-viscosity ceramic paint, and the paint is output via the output end 220 of the paint delivery unit 22.

[0029] The drum 21 can rotate relative to the vehicle body 1. The drum 21 is arranged at the periphery of the output end 220 of the paint delivery unit 22, and is arranged near the output end 220 of the paint delivery unit 22. Therefore, when the vehicle body 1 is placed in the flow channel of the pump housing, the paint output from the output end 220 of the paint delivery unit 22 is thrown outward under the centrifugal force generated by the rotation of the drum 21, thereby the paint can be evenly coated on the flow channel wall of the pump housing, and the coating treatment of the blind area or inaccessible area inside the pump housing is realized. When in use, the operator controls the traction member 3 to push the coating device into the pump housing and reach the inlet 401 of the outer flow channel 41. Then the paint delivery unit 22 is used to transport the paint to the vicinity of the drum 21 and start coating. The operator controls the traction member 3 to uniformly pull the coating device to the position of the outlet 402 of the outer flow channel 41, so that the paint coating inside the pump housing can be completed. The paint can achieve a semi-atomized effect of the paint through the high-speed rotating drum 21, and a uniform paint film is attached to the inner wall of the pump housing.

[0030] To sum up, the utility model has at least the following beneficial effects: the coating unit is driven by the vehicle body 1 to move in the curved outer flow channel 41 inside the pump casing, and the paint output through the paint delivery unit 22 can be evenly coated on the wall surface of the outer flow channel 41 inside the pump casing under the action of the centrifugal force generated by the rotation of the drum 21, thereby completing the internal coating of the double-channel pump casing.

[0031] like Figures 2 to 4 As shown, in some embodiments, the drum 21 is provided with a plurality of second through holes 211 along its circumference. The paint can be evenly thrown out onto the wall surface of the outer flow channel 41 inside the pump housing through these second through holes 211. The drum 21 can be made of PVC with a diameter of 100 mm. The aperture of the second through hole 211 can be 1.25 mm.

[0032] like Figures 2 to 4 As shown, in some embodiments, a magnet 80 is provided on the vehicle body 1. Specifically, a magnet 80 is provided at the bottom of the vehicle body 1, and the vehicle body 1 can be adsorbed inside the pump housing through the magnet 80. When in use, the bottom of the vehicle body 1 can be directed toward the middle partition 40, so that the wheels 13 can be attached to the middle partition 40 for walking, and the vehicle body 1 can be adsorbed on the middle partition 40 through the magnet 80 at its bottom. Because the middle partition 40 has a relatively flatter surface, the vehicle body 1 can have better movement stability, and the uniformity of the paint on the inner wall of the pump housing is also increased.

[0033] like Figures 2 to 4 As shown, in some embodiments, in order to improve the flexibility of the vehicle body 1 and make the vehicle body 1 move more smoothly in the curved flow channel, the vehicle body 1 may include a first part 11 and a second part 12 that are rotatably connected, the coating unit is connected to the first part 11, and the traction member 3 is connected to the second part 12.

[0034] The first part 11 and the second part 12 can rotate relative to each other at a certain angle, so as to better adapt to the curved flow channel. The body 1 can be made of aluminum alloy, and the overall length can be 180 mm.

[0035] like Figures 2 to 4 As shown, in some embodiments, the first part 11 includes a first base 111 and a first connecting part 112 connected to each other, the second part 12 includes a second base 121 and a second connecting part 122 connected to each other, the coating unit is connected to the first base 111, and the traction member 3 is connected to the second base 121. One of the first connecting part 112 and the second connecting part 122 includes a rotating shaft, and the other includes an axial hole adapted to the rotating shaft. That is, the first connecting part 112 may include a rotating shaft, and the second connecting part 122 may include an axial hole adapted to the rotating shaft; or the second connecting part 122 may include a rotating shaft, and the first connecting part 112 may include an axial hole adapted to the rotating shaft. Thus, the first connecting part 112 and the second connecting part 122 may be rotatably connected together through the rotating shaft and the axial hole. The axial direction of the rotating shaft is perpendicular to the axial direction of the drum 21, so that the first part 11 and the second part 12 of the vehicle body 1 can form an angle adapted to the curved flow channel inside the pump housing, so that the vehicle body 1 can better adapt to the curved flow channel.

[0036] like Figures 2 to 4 As shown, in some embodiments, the coating unit further comprises a driving motor 7, which is transmission-connected to the drum 21 to provide a rotational driving force for the drum 21. Specifically, the driving motor 7 comprises a motor body 70 and an output shaft 71 connected to each other, and the axial direction of the output shaft 71 is consistent with the axial direction of the drum 21. When the driving motor 7 is started, the drum 21 is driven to rotate coaxially, and the coating is coated on the inner wall surface of the pump housing. When high-viscosity ceramic coating is selected, the rotation speed of the driving motor 7 is required to be at least 8000rpm or more.

[0037] like Figure 3 As shown, in some embodiments, the coating unit further comprises a bearing 50, a support seat 60 is provided on the vehicle body 1, and the bearing 50 is fixedly connected to the support seat 60. Specifically, that is, the support seat 60 is arranged on the first substrate 111 of the first part 11 of the vehicle body 1, and is arranged at one end of the vehicle body 1 away from the traction member 3. A bearing hole 61 is provided on the support seat 60, and the bearing 50 is fixed at the bearing hole 61. The motor body 70 and the rotating drum 21 are respectively located on opposite sides of the support seat 60. The output shaft 71 passes through the bearing hole 61 and is coaxially connected with the bearing 50, and its end away from the motor body 70 is transmission-connected with the rotating drum 21. Thus, the output shaft 71 of the drive motor 7 can be effectively supported for rotation by the bearing 50, and the stable output torque provides driving force for the rotating drum 21.

[0038] like Figure 4As shown, in some embodiments, a columnar boss 210 is provided at the center of the drum 21. The boss 210 is provided with a connecting hole 212, and the connecting hole 212 is engaged with an end of the output shaft 71 away from the motor body 70.

[0039] like Figure 3 and Figure 4 As shown, in some embodiments, the paint delivery unit 22 is tubular. When the coating device is in use, the output end 220 of the paint delivery unit 22 is located inside the pump housing, and the input end of the paint delivery unit 22 can be placed outside the pump housing. That is, when the vehicle body 1 reaches the inlet 401 of the outer flow channel 41 inside the pump housing, the input end of the paint delivery unit 22 can be arranged outside the pump housing and connected to the paint source outside the pump housing. In some other embodiments not shown in the figure, the paint delivery unit 22 can also be completely arranged on the vehicle body 1. At this time, the paint delivery unit 22 can include a storage member for storing paint and a fluid delivery pump connected to the storage member, thereby the paint in the storage member can be output from the output end 220 of the storage member to the vicinity of the rotating drum 21 through the driving force provided by the fluid delivery pump.

[0040] like Figure 3 As shown, in some embodiments, the support seat 60 is further provided with a first through hole (not shown), and the output end 220 of the paint delivery unit 22 is passed through the first through hole to obtain positioning. Figure 3 and Figure 4 As shown, the coating device may further include a first fixing member 81 disposed on the second base 121 of the second portion 12 of the vehicle body 1 and a second fixing member 82 disposed on the second base 121 of the first portion 11 of the vehicle body 1. Since the tubular paint delivery unit 22 needs to pass through the second portion 12 and the first portion 11 of the vehicle body 1 in sequence, the area of ​​the paint delivery unit 22 located on the second portion 12 can be connected to the fixing member 81 to be positioned, and the output end 220 of the paint delivery unit 22 is connected and positioned through the second fixing member 82 and the first through hole on the support seat 60, respectively. As a result, the paint delivery unit 22 has three fixed points on the vehicle body 1, can be effectively supported on the vehicle body 1, and ensures the stability of paint delivery.

[0041] In some embodiments, the traction member 3 is a flexible rod. For example, the traction member 3 can be a glass fiber rod. Specifically, the traction member 3 can be a glass fiber rod with a diameter of 4 mm. That is, the traction member 3 has a certain bendability, so that it can have a certain deformation and bending ability inside the pump housing, and pull the vehicle body 1 to a specified position. The traction member 3 mainly serves as a driving medium for the vehicle body 1 to move inside the pump housing. The vehicle body 1 can be adsorbed inside the pump housing through the magnet 80 at the bottom, and the magnetic force of the magnet 80 does not affect the normal movement of the vehicle body 1.

[0042] The use process of the coating device of one embodiment of the utility model is as follows: the coating device is pushed into the inlet 401 of the outer flow channel 41 inside the pump casing by the traction member 3, and the rubber wheel is completely attached to the middle partition 40 inside the pump casing. Under the action of the magnetic adsorption force, the coating device will fit the middle partition 40 inside the pump casing. First, turn on the drive motor 7, and modulate the speed to 8000rpm, and then use the paint delivery pipe to deliver the high-viscosity ceramic paint to the drum 21, and use the fiberglass rod to pull the coating device to the outlet 402 of the outer flow channel at a uniform speed, so that the coating inside the pump casing can be completed. After the paint is solidified, the thickness of the paint is measured. If the thickness is insufficient, repeat the above coating process until the thickness of the paint on the inner wall of the pump casing meets the requirements. The coating device of the utility model can realize the coating of the anti-corrosion coating on the inner wall of the pump casing, and the tooling structure is simple, the skill requirements for the operator are low, and no special tools such as high-pressure spraying are required.

[0043] The above embodiments only express the preferred implementation methods of the utility model, and the descriptions are relatively specific, but they cannot be understood as limiting the patent scope of the utility model; for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined or deformed and improved, all of which belong to the protection scope of the utility model; therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A pump casing flow channel coating device, characterized in that: It comprises a vehicle body (1), a coating unit and a traction member (3) for driving the vehicle body (1); The traction member (3) is connected to the vehicle body (1), and the coating unit is arranged on the vehicle body (1) and moves with the vehicle body (1); The spin coating unit comprises a rotating drum (21) and a paint delivery unit (22), wherein the paint delivery unit (22) comprises an input end for inputting paint and an output end (220) for outputting paint, and the rotating drum (21) is arranged at the periphery of the output end (220) of the paint delivery unit (22).

2. The pump housing flow channel coating device according to claim 1, characterized in that: The vehicle body (1) is provided with a magnet (80).

3. The pump housing flow channel coating device according to claim 1, characterized in that: The vehicle body (1) comprises a first part (11) and a second part (12) which are rotatably connected, the coating unit is connected to the first part (11), and the traction member (3) is connected to the second part (12).

4. The pump housing flow channel coating device according to claim 3, characterized in that: The first part (11) comprises a first base (111) and a first connecting part (112) connected to each other, the second part (12) comprises a second base (121) and a second connecting part (122) connected to each other, the coating unit is connected to the first base (111), and the traction member (3) is connected to the second base (121); one of the first connecting part (112) and the second connecting part (122) comprises a rotating shaft, and the other comprises an axial hole adapted to the rotating shaft.

5. The pump casing flow channel coating device according to claim 1, characterized in that: The spin coating unit further comprises a driving motor (7), and the driving motor (7) is drivingly connected to the rotating drum (21).

6. The pump housing flow channel coating device according to claim 5, characterized in that: The coating unit further comprises a bearing (50), a support seat (60) is provided on the vehicle body (1), and the bearing (50) is fixedly connected to the support seat (60); The driving motor (7) comprises a motor body (70) and an output shaft (71) connected to each other, and the motor body (70) and the rotating drum (21) are respectively located on opposite sides of the support seat (60); the output shaft (71) is coaxially connected to the bearing (50), and one end of the output shaft (71) away from the motor body (70) is drivingly connected to the rotating drum (21).

7. The pump housing flow channel coating device according to claim 6, characterized in that: The support seat (60) is provided with a first through hole, and the output end (220) of the paint delivery unit (22) is passed through the first through hole.

8. The pump casing flow channel coating device according to claim 1, characterized in that: The traction member (3) is a flexible rod.

9. The pump casing flow channel coating device according to claim 8, characterized in that: The traction member (3) is a glass fiber rod.

10. The pump housing flow channel coating device according to claim 1, characterized in that: The coating material conveying unit (22) is in a tubular shape; And / or, the rotating drum (21) is provided with a plurality of second through holes (211) along its circumference.

Images