JPH05187794A - Automatic cleaner for outer surface of heat exchanger - Google Patents

Abstract

PURPOSE:To efficiently remove scale, etc., deposited on a heat transfer panel and to automatically clean by providing a plurality of expansion arms at a traveling truck, providing a nozzle at an end of the one arm, and connecting a high pressure pump unit and a control unit to the nozzle. CONSTITUTION:A truck 16 which travels along a horizontal track 12 on a ground surface by a driver 14 is provided at an apparatus body 10. A base end is mounted at the truck 16, and a first arm 20 which is extensible in a Y-axis direction is provided at its end 18. The base end is mounted at the truck 16, and the arm 20 which is expandable in the Y-axis direction is provided at the end 18. The base end is mounted at the end 18 of the arm 20, and an end 22 is provided at a second arm 24 which is extensible in a Z-axis direction. Further, both the first and second arms 20, 24 are driven. Motor-driven first and second actuators 25, 26 are provided. On the other hand, a nozzle is mounted at the end of the arm 24 through a mount, and a high pressure pump unit 32 is connected thereto. Thus, the body 10 is set to a water flow-down type heat exchanger 100, and an outer surface 104 of a heat transfer panel 102 is cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer surface of a heat exchanger for automatically cleaning the outer surface of a heat exchanger, particularly the outer surface of a large number of vertically extending heat transfer panels of a water-flow heat exchanger. The present invention relates to an automatic surface cleaning device.

[0002]

2. Description of the Related Art A number of thin flat plates or corrugated plates are faced to each other so that a large number of hollow panels each having a thin hollow portion extending in a plane are formed so as to stand upright. A heat transfer panel of a type in which water from a river or seawater is allowed to flow down, and a fluid flowing inside the panel is cooled by water or seawater flowing down the outer surface, and conversely, a low temperature fluid flowing inside the panel is heated or vaporized. A large number of heat exchangers provided with are conventionally used. In this specification, this type of heat exchanger is hereinafter referred to as a water-flow-type heat exchanger. Water or seawater in rivers contains various inorganic substances such as shellfish, algae and other organic substances and sand, and dissolves or corrodes various metals. Organic substances such as shellfish and algae adhere to the outer surface of the heat transfer panel of the vessel,
Scales composed of deposits of inorganic substances such as metals and sand are deposited. The adhered substances and the accumulated scale significantly reduce the heat exchange efficiency of the water flow type heat exchanger, and if left to stand, they corrode the outer surface of the heat transfer panel. Therefore, conventionally, the operation of the water flow-down heat exchanger is periodically stopped and the worker manually cleans the outer surface of the panel with a brush or a water jet.

[0003]

However, the above-mentioned manual cleaning of the outer surface of the heat exchanger requires the harsh labor between the heat transfer panels standing upright at a narrow interval under the hot weather or the agar to give off the strange odor of the scale. However, there was a limit to increasing the pressure of the water jet manually, and it was very inefficient. Attempts were also made to use machines to improve work efficiency, but were unable to produce satisfactory results. This is because the dimensions of the heat transfer panels in a downflow heat exchanger are generally quite large and the spacing between the panels is narrow, which requires precise positioning of the machine, but none of the conventional machines can do this satisfactorily. This is because the. In view of such a situation, an object of the present invention is to remove the scale almost completely on the outer surface of the heat exchanger, particularly the outer surface of the heat transfer panel extending in the vertical direction of the water-flow heat exchanger with high work efficiency. The present invention provides an automatic cleaning device for the outer surface of a heat exchanger that automatically and mechanically cleans the outer surface of the heat exchanger.

[0004]

The object of the present invention is achieved by an automatic cleaning device for an outer surface of a heat exchanger having the following features according to the present invention. The features are a trolley driven by a drive device to travel forward and backward freely on the track, and one end is attached to the trolley, and the other end freely expands and contracts in a horizontal direction orthogonal to the track. A first arm and a second arm having one end (first end) attached to the other end of the first arm and the other end (second end) freely extending and contracting in the vertical direction , An actuator that operates expansion and contraction movements of the first arm and the second arm, a nozzle that is attached to the second end of the second arm and injects water outward at an appropriate angle, and supplies high-pressure water to the nozzle. A high pressure pump unit,
And a control unit that controls the operation of the drive unit and the actuator to position the nozzle at a preset position and further controls the operation of the high-pressure pump unit.

Preferably, in order to increase the cleaning speed, a drive device for reciprocating the nozzle mounting portion in a horizontal direction orthogonal to the track is provided at the other end of the second arm. As a result, the nozzle reciprocates with respect to the cleaning surface, for example, the outer surface of the heat exchanger, thereby increasing the cleaning speed and eliminating the uncleaned portion. When the automatic cleaning device according to the present invention requires explosion-proof specifications, the drive device is a water turbine type drive machine driven by a part of the high pressure water supplied to the nozzle, and the rotation of the water turbine type drive machine. And a crank mechanism for converting motion into reciprocating motion, so as to constitute a rotating part that does not generate electric sparks.

More specifically, the second end of the second arm is driven by high-pressure water supplied from the high-pressure pump unit to cause the shaft to have a rotational motion, and the rotational motion of the shaft of the hydraulic turbine drive device. Is provided with a driving device including a crank mechanism for converting the reciprocating motion into a reciprocating motion in a horizontal direction orthogonal to the orbit, and the nozzle mounting portion is driven by the crank mechanism to move horizontally on the second end of the second arm orthogonal to the orbit. The nozzle disposed in the nozzle mounting portion is reciprocated in various directions, and is oriented in a direction intersecting a vertical plane orthogonal to the trajectory. Desirably, in order to smoothly reciprocate the nozzle mounting portion, the nozzle mounting portion slides on a rail provided on the second end, or a wheel is attached to the nozzle mounting portion to run on the rail. To let

In order to improve the positioning accuracy of the nozzle for jetting water to always maintain the accurate positional relationship between the nozzle and the heat transfer panel, or to prevent the outer surface of the heat transfer panel from having an uncleaned portion. In order to accurately position the nozzle at the preset position, there must be no play in the gear mechanism of the cart and the orthogonal system rotary shaft drive unit for transmitting power to the first arm and the second arm by the drive unit and the actuator. is necessary. Since a commercially available gear mechanism generally has play, a backlashless-nemoto drive system (registered trademark NEMODRIVE) is preferably used for the above-mentioned orthogonal system rotary shaft drive unit. less than,
The invention will be described in more detail on the basis of exemplary embodiments with reference to the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a heat transfer panel 1 in which a number of apparatus 10 of an outer surface automatic cleaning apparatus for a heat exchanger according to the present invention are upright.
2 is a schematic plan view of the apparatus 10 and the water-flow-type heat exchanger 100 when applied to a water-flow-type heat exchanger 100 including 02 (only two heat transfer panels are shown for simplicity). FIG.
2A and 2B are schematic side views of the device 10. FIG. 2A shows the device 10 in an operation standby state, and FIG. 2B shows the device 10 in a state where the operation is started and the first arm is extended. Indicates. Figure 3
FIG. 4 is a schematic partial cross-sectional side view showing details of an end portion of a second arm on which a nozzle is attached.

As shown in FIGS. 1, 2 and 3, the device 1
0 is a horizontal orbit 12 (orbit 12
Is the X-axis direction, the direction orthogonal to the orbit 12 is the Y-axis direction, and the direction orthogonal to the plane formed by the direction of the orbit 12 and the direction orthogonal to the orbit 12 is the Z-axis direction. ) A dolly 16 that is driven by a drive device 14 to travel above, a first arm 20 that has one end attached to the dolly 16 and the other end portion 18 that extends and contracts freely in the Y-axis direction, and one end that is the first arm. A second arm 24 attached to the tip end portion 18 of the second arm 20, and the other opposite end portion 22 of which freely extends and contracts in the Z-axis direction
An electric first actuator 25 that operates the extension / contraction motion of the first arm, an electric second actuator 26 that operates the extension / contraction motion of the second arm, and a tip portion 22 of the second arm 24.
A nozzle 3 that is attached to a nozzle attachment portion 28 provided in the nozzle 3 and injects water outward from the tip portion 22 in a non-vertical direction.
0 and a high pressure pump unit 32 for supplying high pressure water to the nozzle 30. In this embodiment, separate actuators are used to operate the first arm and the second arm, but the first actuator and the second arm can be moved by the same actuator by using an appropriate means commonly used. It can also be activated. Furthermore, in this embodiment, the first
Although an electric actuator is used as the second actuator, a hydraulic actuator such as a hydraulic actuator or a pneumatic actuator can be used as an alternative.

Further, the apparatus 10 controls the operation of the drive unit 14 and the actuators 25 and 26 to position the nozzle 30 at a preset position, then starts the high pressure pump unit 32, and after a lapse of a fixed time, Then, the nozzle 30 is positioned at the next set position, and the control unit 34 is provided to control each component to repeat the same operation.

The carriage 16 is driven by a drive unit 14 so that it can move forward and backward along the track 12 in the X-axis direction at a maximum speed of about 3 m.
Moves at a speed of / min. Although the track 12 is shown as a straight line in FIG. 1, it is not necessarily a straight line and may be a curved track according to the shape of the heat exchanger to be cleaned. The first arm 20 is composed of a plurality of so-called core-type concentric cylinders used in a telescope or the like, four hollow shafts in this embodiment, and is driven by the first actuator 25 to have a small inner hollow shaft. And the distal end portion 18 of the first arm 20 extends in the Y-axis direction. The reverse is true when the first arm 20 contracts. The maximum speed of expansion and contraction of the first arm 20 is about 4 m / min at the tip portion 18. Preferably, the carriage 16 is provided with an elevating device 36 as in the present embodiment shown in FIG. 2A, whereby the first arm 20 is allowed to elevate in the Z-axis direction, whereby the positioning of the nozzle 30 is further enhanced. Can be done quickly. The elevating device 36 provided in the present embodiment can freely elevate and lower the first arm 20 in the Z-axis direction, and further, the first arm support portion of the first arm 20 can freely rotate in the XY plane. The first arm 20 is supported so that it can move. Thereby, the first arm 20
Can move freely according to the unevenness of the outer surface 104 of the heat transfer panel of the heat exchanger, so that it is possible to prevent an excessive force from acting on the arm due to the surface shape of the outer surface 104 of the heat transfer panel. ..

Further, preferably, as in this embodiment, an inclinometer 38 is provided near the tip end portion 18 of the first arm 20, and another actuator (not shown) is further provided at the center portion of the first arm 20.
First arm support columns 40, which are freely driven to expand and contract in the vertical direction, are provided, and the arm supports 40 are automatically adjusted based on the measurement result of the inclinometer 38 to automatically adjust the first arm 20.
Be sure to maintain the horizontal level of.

The second arm 24 is composed of a plurality of so-called core type concentric cylinders, which are used in a telescope or the like, like the first arm 20, and four hollow shafts in this embodiment.
Driven by the actuator 26, the distal end portion 22 of the second arm extends in the Z-axis direction by sequentially protruding from the inner small-diameter hollow shaft. The expansion and contraction speed of the second arm 24 depends on the tip 2
2 is about 4 m / min. In the present embodiment, the second arm 2
For convenience of holding and supporting, 4 is driven by another actuator provided in the vicinity of the tip end portion 18 of the first arm 20, that is, a second arm rotation actuator 42 to rotate in the plane of the Y axis and the Z axis. Then, as shown in FIG. 2A, when the apparatus 10 is in the standby state, it is positioned in a direction parallel to the longitudinal axis direction of the first arm 20, that is, in the Y-axis direction, and is rotated in the Z-axis direction during operation. ing.

The nozzle 30 is attached to a nozzle attaching portion 28 provided on the tip portion 22 of the second arm as shown in FIG. The nozzle mounting portion 28 is the nozzle 3
0 is attached and two manifolds are provided in the Y-axis direction along both edges of the tip 22 in order to evenly distribute high-pressure water to the nozzle 30. Three nozzles 10 are provided for each of the two manifolds of the nozzle mounting portion 28.
It is composed of 6 water jet nozzles symmetrically arranged at intervals of 0 mm, and the line of intersection of the vertical plane and the nozzle is about 10 ° with the nozzle mouth facing downward from the outer edge of the nozzle mounting portion 28 to the outside.
Water is jetted toward the panel outer surface 104 of the heat transfer panel 102 of the water flow-type heat exchanger 100 by inclining to form a front-back direction. The inclination angle of the nozzle 30 varies depending on the pressure of water to be sprayed, the shape of the heat transfer panel 102, the scale of the outer surface 104 of the heat transfer panel 102, and the like. The water injection nozzle 30 is provided symmetrically on the nozzle mounting portion 28 in order to cancel the reaction force of the water jet injection on the outer surface of the panel of the heat exchanger. The water injection nozzle has a mechanism that reciprocates in the Y-axis direction along the outer surface of the panel.
The dead zone can be eliminated when cleaning the outer surface of the panel of the heat exchanger.

In this embodiment, as shown in detail in FIG. 4 as a mechanism for reciprocating the water jet nozzle in the Y-axis direction along the outer surface of the panel, the tip portion 22 is the nozzle mounting portion 2.
A drive device 44 for reciprocating the Y 8 in the Y-axis direction is provided. The drive device 44 includes a water turbine type drive device 46 and the gear mechanism 4.
A crank mechanism 48 which is connected to the water turbine type drive machine 46 via 5 and which converts the rotational power generated by the water wheel type drive machine 46 into a reciprocating motion in the Y-axis direction, and a crank arm 49 of the crank mechanism 48. The moving table 50 reciprocates horizontally in the Y-axis direction.

The water turbine type drive machine 46 applies a rotational force to the shaft of the drive machine by the high pressure water partially flown from a high pressure water path (not shown) for supplying high pressure water from a high pressure pump unit 32 described later to a water injection nozzle. This is generated, and a commercially available water turbine type drive machine can be used. The rotary motion of the shaft of the water turbine type drive machine 46 is converted into a reciprocating motion in the Y-axis direction by a crank mechanism 48 using a commonly used crank means, and the movable table 50 is horizontally moved in the Y-axis direction via a crank arm 49 ( Reciprocating motion (in the direction of double arrow W in FIG. 4). The water turbine type drive machine 46 is mounted on the tip portion 22, and the crankcase of the crank mechanism 48 is supported by a column fixed to the tip portion 48. The nozzle mounting portion 28 is provided on the moving table 5
0, and a rail (not shown) provided on the tip portion 22 is slidably reciprocated together with the movable table 50. In this embodiment, the moving table 50, and hence the nozzle mounting portion 28, reciprocates once per second with a stroke of 150 mm.

Generally, in the case of the water flow-down heat exchanger 100 as shown in FIG. 1, two troughs 106 for flowing water are provided at the upper part of the heat exchanger as shown in FIG. It is provided between the heat transfer panels 102 along the longitudinal direction (Y-axis direction) of the panels. Since the gap between the panel outer surface 104 and the trough 106 of the water downflow heat exchanger 100 is narrow, the nozzle mount may be used to clean the portion 108 of the heat exchanger panel outer surface 104 that faces the trough 106. 28 of 2
The manifold of the book is provided with another upwardly directed water jet nozzle 52 which is arranged to face the outer surface portion 108 described above.

Preferably, when the first arm 20 and the second arm 24 are extended and contracted, the distal end portion 22 of the second arm 24 that moves together is stably guided, and the positions thereof are stably maintained during operation. Therefore, a cylindrical guide roller 54 that guides in the Z-axis direction is provided on the side surface of the tip portion 22 along the Y-axis direction. In this embodiment, two guide rollers 54 are provided on each side of the tip 22 and are supported by a roller support shaft 58 via a universal joint 56.
The tip portion 2 is provided by a pressing means such as a coil spring arranged in the inside 8.
The outer panel surfaces 104 of the heat exchangers located on both sides of 2 are pressed in opposite X-axis directions.

As shown in FIG. 1, the high pressure pump unit 3
2 and a control unit 34 are provided separately from the above-mentioned movable parts of the outer surface automatic cleaning device 10 of the heat exchanger. The high-pressure pump unit 32 is composed of a high-pressure pump having a discharge pressure of approximately 150 to 200 kg / cm ² and a drive motor for supplying water for water injection to the nozzle 30 at high pressure. In this embodiment, the high pressure pump has a design discharge pressure of 200 kg.
It is a plunger pump with a design flow rate of 110 liter / min / cm ² . The water is trolley 16, first arm 20, and second
In order to follow the movement of the arm 24 or the like, the nozzle 30 is moved from the high pressure pump unit 32 through a flexible high pressure hose 60.
Sent to.

The control unit 34 controls the track 12 of the truck 16.
The drive device 14 for driving the above reciprocating motion, the first actuator 25 for operating the expansion / contraction motion of the first arm 20, and the second actuator 26 for operating the expansion / contraction motion of the second arm 24, and in the present embodiment, the first arm 20. The elevation device 36 for elevating and lowering the second arm 24 and the second arm rotation actuator 42 for rotating the second arm 24 in the YZ axis plane are controlled, and the nozzle 30 is set at a position which is input and set in advance in a computing device such as a microcomputer. And 52 to be accurately positioned. The method of setting the position is not special to this apparatus, but is a method that has been conventionally used. In this embodiment, a reference point is provided on the outer surface of the panel of the heat exchanger to be cleaned, and the coordinates of the X-axis-Y-axis-Z-axis with the reference point as the origin are set. Then
The positions where the nozzles 30 should be positioned with respect to the outer surface 104 of the panel to be cleaned are determined by the coordinates and stored in advance in an arithmetic unit such as a microcomputer of the control unit 34, and the positions of the nozzles 30, 52 are positioned accordingly. The control signal from the control unit 34 is transmitted by a signal cable (not shown) where it is needed. More preferably, as in this embodiment, the position sensor 62
Is provided at the tip end portion 18 of the first arm 20 and another position sensor 64 is provided at the tip end portion 22 to confirm a preset target point on the panel outer surface 104 and transmit the deviation to the control unit 34 for control. If the control command of the unit 34 is corrected, more accurate positioning can be performed.

When the nozzle 30 is set to the set position, the control unit 34 starts the high pressure pump unit 32 to send high pressure water to the nozzle 30. Then the drive device 14,
At least one of the actuators 25, 26 and the lifting device 36 is commanded to operate at least one of the carriage 16, the first arm and the second arm, and the nozzles 30, 52 are moved to the next set position. Again, the high pressure pump unit 32 is started in the same manner. By repeating this operation, the nozzles 30 and 52 are positioned at all preset positions that have been input in advance to completely clean the outer surface of the panel.

In the present apparatus 10, in order to cause the carriage 16 to reciprocate and the first arm 20 and the second arm 24 to extend and retract, for example, the drive shaft extending in the X-axis direction is rotated to extend in the Y-axis direction. It is necessary to convert the rotation of the shaft to transmit power. Therefore, an orthogonal system rotary shaft drive unit is used in each place, for example, in the drive device 14, the lifting device 36, the actuators 25 and 26, and the like. Generally, there is backlash in the gear mechanism of the commercially available orthogonal system rotary shaft drive unit, and therefore the nozzles 30 and 52 cannot be accurately positioned. Preferably, as used in this embodiment, a backlash-less orthogonal rotary shaft drive mechanism, for example, a Nemoto drive system manufactured and sold by Nemoto Planning Industry Co., Ltd. (Yachiyo City, Chiba Prefecture). (Trademark registration NEMODRI
VE) is used.

The test results of the method of operating the apparatus 10 and the cleaning of the outer surface of the panel of the heat exchanger according to this embodiment will be described below. When the present apparatus 10 is used, first, as shown in FIG. 1, a vertical direction is orthogonal to the longitudinal axis of a plurality of heat transfer panels 102 that are arranged upright and in parallel with a water-flow heat exchanger 100 to be cleaned. The apparatus 10 is placed so that the track 12 is positioned in the direction. The water flow-down heat exchanger 100 shown in FIG. 1 includes 24 panels 102 having a length of 9 m and a height of 4 m, which are arranged upright and in parallel at intervals of 0.6 m. The overall dimensions of the vessel 100 are approximately 19 m long, 9 m wide and 4 m high. The panel 102 is repeatedly provided with corrugations in the Y-axis direction of the panel in order to increase the heat transfer area of the panel. The water flow-down heat exchanger 100 uses seawater as a panel 10
It has been continuously used for about 1.5 months as an LNG vaporizer that evaporates LNG inside the panel by flowing it down to both outer surface sides of 2, and shells, algae, and other scales are considerably attached to the panel surface. It was

Next, a reference point is provided on one of the panels 102, and the coordinates of the X-axis-Y-axis-Z-axis with the reference point as the origin are set. Next, the position where the nozzle 30 should be located with respect to the panel outer surface 104 to be cleaned is determined by the coordinates and stored in advance in the arithmetic unit of the control unit 34. In this embodiment, the water jet cleaning device 24 is set to move at a pitch of 300 mm in the Y-axis direction.

Next, the apparatus 10 was started up, and the outer panel surface 104 of the water-flow heat exchanger 100 was automatically cleaned one after another without any omission of cleaning to clean the scale. Outer surface of both sides of one panel, that is, 4 × 9 × 2 = 72 m ² for 1 hour, 24 panels in total for one water-flow heat exchanger is continuous for 24 hours, which is not comparable to manual cleaning. The scale could be removed completely and cleaned. In the cleaning experiment using the apparatus 10 of the present embodiment, the water flow-down heat exchanger 100 is used.
Although the outer surface of the heat transfer panel 102 was cleaned during the suspension of operation, the automatic cleaning device for the outer surface of the heat exchanger according to the present invention can be basically used even while the water flow heat exchanger is in operation. Is.

[0026]

According to the present invention, the high-pressure water jet nozzle is provided on the X-axis and Y-axis.
A mechanism that moves freely in the axial and Z-axis directions, preferably a mechanism that uses a backlashless-nemoto-drive-system for the orthogonal system rotary shaft drive part of the mechanism to improve positioning accuracy, and a nozzle at a set position. By providing an automatic cleaning device for the outer surface of the heat exchanger, which has a control unit for controlling the mechanism so as to accurately position the heat exchanger, the outer surface of the heat exchanger, especially the water-down heat It makes it possible to automatically mechanically clean the outer surface of a large number of upright heat transfer panels of the exchanger. Thereby, the worker can be released from the hard work. Further, the automatic cleaning device for the outer surface of the heat exchanger according to the present invention can completely remove the scale on the outer surface of the heat transfer panel with high work efficiency, and can be used while the heat exchanger is in operation if necessary. The effect of significantly improving the operation efficiency of a device using a water-flow-type heat exchanger, such as an LNG plant, is obtained. Furthermore,
The present invention provides a drive device for reciprocating the nozzle mounting portion in a horizontal direction orthogonal to the track at the other end of the second arm, so that the nozzle can be cleaned with respect to the cleaning surface, for example, the outer surface of the heat exchanger. Reciprocate to increase the cleaning speed and eliminate unwashed parts. Further, the drive device is composed of a water turbine type drive device driven by a part of the high pressure water supplied to the nozzle and a crank mechanism for converting the rotational motion of the water turbine type drive device into a reciprocating motion, and generation of electric sparks. The present invention realizes an automatic cleaning device that can be used in a place where explosion-proof specifications are required, by using a rotating unit that does not have the above-mentioned structure.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an automatic cleaning device for an outer surface of a heat exchanger according to the present invention and a water flow-down heat exchanger including a large number of upright heat transfer panels for cleaning using the automatic cleaning device.

2 (a) is a schematic side view in a standby state of the automatic cleaning device for cleaning the outer surface of the heat exchanger shown in FIG.
(B) is a typical side view of the 1st arm of the extended state.

3 is a partial cross-sectional side view of the distal end portion of the second arm taken along the line AA in FIG.

FIG. 4 is a schematic plan view of a drive device that reciprocates in a nozzle mounting portion.

[Explanation of symbols]

10 Automatic Cleaning Device for External Surface of Heat Exchanger According to the Present Invention 12 Orbit 14 Drive Device 16 Carriage 18 Tip of First Arm 20 First Arm 22 Tip of Second Arm 24 Second Arm 25 First Actuator 26 Second Actuator 28 Nozzle attachment part 30 Nozzle 32 High pressure pump unit 34 Control unit 36 Elevating device 38 Inclinometer 40 First arm support pillar 42 Second arm rotation actuator 44 Drive device for reciprocating the nozzle attachment part in the Y-axis direction 46 Water turbine type Drive unit 48 Crank mechanism 50 Moving table 52 Upward nozzle 54 Guide roller 56 Universal joint 58 Roller support shaft 60 High pressure hose 62 Position sensor 64 Another position sensor 100 Water flow down heat exchanger 102 Heat transfer panel 104 Outer surface of heat transfer panel 106 trough 10 The outer surface of the heat transfer panels facing the trough

Claims (3)

[Claims] 1. A trolley driven by a drive device to travel forward and backward on a track, and one end of which is attached to the trolley and the other end of which is freely movable in a horizontal direction orthogonal to the track. A first arm that expands and contracts, and one end (first end) is attached to the other end of the first arm, and the other end (second end) freely expands and contracts in the vertical direction. No. 2 arm, an actuator for actuating the expansion and contraction movement of the first arm and the second arm, and a nozzle attached to the nozzle mounting portion of the second end of the second arm for injecting water outward at an appropriate angle. A high pressure pump unit for supplying high pressure water to the nozzle,
And a control unit that controls the operation of the drive unit and the actuator to position the nozzle at a preset position and further controls the operation of the high-pressure pump unit. Automatic cleaning device for outer surface. 2. The automatic cleaning device for an outer surface of a heat exchanger according to claim 1, wherein the second end portion of the second arm is driven by high-pressure water supplied from the high-pressure pump unit to move to a shaft. The nozzle mounting portion is provided with a driving device including a water turbine type driving machine that causes a rotational movement and a crank mechanism that converts the rotational movement of the shaft of the water turbine type driving machine into a reciprocating movement in a horizontal direction orthogonal to the orbit. Driven by the crank mechanism to reciprocate in a horizontal direction on the second end of the second arm in a horizontal direction orthogonal to the orbit, and the nozzle disposed in the nozzle mounting portion is attached to the orbit. An automatic cleaning device for an outer surface of a heat exchanger, characterized in that it is oriented in a direction intersecting perpendicular vertical planes. 3. A backlashless-nemoto drive system for an orthogonal system rotary shaft drive section for transmitting power for operating the carriage and the first arm and the second arm by the drive unit and the actuator. The automatic cleaning device for the outer surface of the heat exchanger according to claim 1 or 2, characterized in that a trademark registered NEMODRIVE) is used.