JPH0631691B2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger, and in particular, it is possible to clean a heat transfer surface and move a heat transfer fluid simultaneously or individually,
The present invention relates to a heat exchanger having a simple structure that enables easy maintenance.

<Prior Art> Conventionally, in a heat exchanger used for continuously exchanging heat for a plurality of fluids, in order to increase temperature efficiency, in addition to increasing the heat transfer area, both fluids are set to countercurrent flow. It is required to have a long heat transfer passage.

By the way, conventionally, in order to make this heat exchanger small in size, in the gas-gas heat exchanger, each gas was made to flow through the fixed double scroll cylinder, and the heat was moved through the solid wall to cope with it.

However, the dissolved components in the heat transfer fluid may crystallize or the suspended matter in the heat transfer fluid may be deposited, so that they adhere to the heat transfer surface and reduce the heat transfer coefficient. In addition, cleaning of the heat transfer surface must be performed by separating or disassembling the casing and the cover plate and taking out the heat transfer tube from the inside of the container, which makes the cleaning operation complicated and increases the maintenance cost. was there.

Therefore, as one method for simplifying the cleaning work of the heat transfer surface, a method of mixing a heat transfer fluid with a cleaning material and cleaning the heat transfer surface with the cleaning material has been proposed, but the cleaning effect is In addition to being insufficient, the heat transfer efficiency is lowered, the cost of maintenance is increased, and when the heat transfer fluid is a gas, it is difficult to carry out the method.

<Problems to be Solved by the Invention> In view of the above-mentioned problems of the prior art, a main object of the present invention is to make a sliding scroll on a surface of a heat transfer scroll tube which is a passage for a heat transfer fluid in the tube. The heat transfer surface can be cleaned by moving the pipes so that it can be installed in a narrow space and has a space-saving structure, while at the same time reducing equipment costs and simplifying maintenance. To provide.

<Means for Solving Problems> According to the present invention, a heat transfer tube is provided inside a container including a casing and a cover plate, and both ends of the heat transfer tube are connected to the container. In a heat exchanger that is connected to each of the inlet pipe and the outlet pipe provided and exchanges heat between the heat transfer fluid inside the pipe and the heat transfer fluid outside the pipe, the heat transfer fluid inside the pipe is in the form of a scroll pipe. The heat scroll tube and the heat transfer fluid outside the tube flow through the path outside the tube, and are moved by the rotation of the eccentric shaft provided in the container to slide on the surface of the heat transfer scroll tube and adhere to the surface. Scraped off impurities such as dust and deposits,
This is achieved by providing a heat exchanger characterized by comprising a sliding scroll tube in the form of a scroll pipe having a structure for cleaning by peeling or the like.

<Operation> As described above, according to the present invention, it is necessary to prevent impurities such as dust and deposits from adhering to the heat transfer surface and lowering the heat transfer coefficient by separating or disassembling the casing and the cover plate. A heat transfer scroll tube in the form of a scroll pipe in which the heat transfer fluid inside the tube flows inside, with the heat transfer surface being cleaned by cleaning the heat transfer surface without removing the heat transfer surface from the inside of the container formed of the casing and the cover plate. The external heat transfer fluid is rotated through a scroll pipe-shaped sliding scroll tube that circulates in the external passage so that the surface of the sliding scroll tube slides on the surface of the heat transfer scroll tube and Impurities such as dust and precipitates adhering to the surface can be forcibly cleaned by scraping or peeling off, so that the surface of the heat transfer tube can be automatically cleaned.

<Embodiment> Next, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show a first embodiment of the heat exchanger according to the present invention.

The heat exchanger A includes a scroll-pipe-shaped heat transfer scroll tube B, which is a heat transfer tube in which a heat transfer fluid in the tube flows, and a heat transfer scroll tube B which slides on the surface of the heat transfer scroll tube B. Sliding scroll, which has a structure to clean the heat transfer surface by scraping and peeling off impurities such as dust and precipitates adhering to the surface, and a heat transfer tube in which the heat transfer fluid outside the pipe flows through the passage outside the pipe. Pipe C and container D containing both scroll pipes
It consists of and.

The container D includes a bottomed cylindrical casing 1 in which both scroll pipes are installed, and a cover plate 2 that covers the upper surface of the casing 1, and the two are coupled via fastening members such as bolts and nuts. ing.

At the bottom of the casing 1, the heat transfer scroll tube B is provided.
An inlet pipe 3, an outlet pipe 4 and a trunk side outlet 5 are provided respectively.

In addition, the cover plate 2 is provided with a trunk side inlet 6 eccentrically provided, and a rotary shaft 7 is pivotally mounted at substantially the center.

On the other hand, the heat transfer scroll tube B and the sliding scroll tube C are made of a material such as steel or copper that is hard to deform, and are formed in a scroll shape in which the scroll direction and the scroll interval are substantially the same. .

The heat transfer scroll tube B is formed in a vertically long flat tube through which the heat transfer fluid a in the tube can flow.

Further, the sliding scroll pipe C is moved by the rotation of the eccentric shaft 8 connected to the rotating shaft 7 provided in the container D while the external heat transfer fluid b flows through the external passage. The heat transfer scroll tube B is formed in a vertically long flat tube having a structure that slides on the surface of the heat transfer scroll tube B.

Further, the sliding scroll tube C is moved by the rotation of the eccentric shaft 8 so that the surface of the heat transfer scroll tube B can be slidably cleaned so that the heat transfer scroll tube B is housed between its spirals. Moreover, the external heat transfer fluid b is formed so as to be able to flow through the external passage between the scroll pipes B and C in the container D.

Further, a brush 9 as a cleaning member is provided outside the sliding scroll pipe C so that the inner and outer surfaces of the crawl pipe B can be cleaned more efficiently.

Further, the sliding scroll pipe C is provided with a core 11 made of a material having a small deformation such as steel or stainless steel in order to reduce deformation during sliding cleaning as much as possible. The core 11 is provided over the entire length of the central portion in the vertical direction so as to divide the inside of the sliding scroll tube C into two in the horizontal direction.

Further, in the sliding scroll pipe C, a connecting member 12 is horizontally installed on the upper surface of an inner end in the winding direction, and an eccentric shaft 8 formed in a crank shape at the center of the connecting member 12.
Are connected via a pivot bearing 14. And
The eccentric shaft 8 is eccentrically provided so as to have a predetermined crank width and is connected to the rotary shaft 7 in a crank shape.

Further, the sliding scroll tube C is rotatably provided on the inner bottom portion of the casing 1 via a bearing 15.

Further, between the sliding scroll pipe C and the inner bottom portion of the casing 1, leakage of the heat transfer fluid b outside the pipe is reduced, and
A sealing material 16 such as packing is interposed so that the pressure can be adjusted so that the contact frictional resistance due to the movement of the sliding scroll tube C is reduced.

The scroll tubes B and C are formed so that the vertical and horizontal positioning can be performed by the bearing 15 and the pivot bearing 14.

The anti-rotation stopper 17 is formed to project outward so that the sliding scroll tube C can rotate only in one direction (eg, counterclockwise direction) and cannot rotate in the opposite direction (eg, clockwise direction). It engages with a stopper receiver 18 formed inwardly of the casing 1.

Next, the operation of the above embodiment will be described.

According to the heat exchanger A, the heat transfer fluid a in the tube is passed through the heat transfer scroll tube B, so that the heat transfer fluid b outside the tube that has been heat-exchanged to the target temperature is efficiently obtained.

That is, first, when the rotary shaft 7 rotates counterclockwise,
The external heat transfer fluid b flows in from the body side inlet 6, enters the inter-tube passage of the outer terminal in the winding direction of the sliding scroll pipe C, and flows toward the inter-tube passage of the inner terminal in the winding direction. Then, through the inter-tube portion, through the inter-tube passage (center portion) of the inner terminal in the winding direction, the heat is exchanged with the heat transfer fluid a in the tube, and the temperature is changed, and the water is discharged from the body side outlet 5. It

Further, the heat transfer fluid a in the pipe flows from the inlet pipe 3 into the inner end of the heat transfer scroll pipe B in the winding direction, flows through the inside of the pipe toward the outer end of the winding direction, and is transferred to the outer end in the winding direction. It is discharged from the outlet pipe 4 through the one end.

At this time, the heat transfer fluid a inside the tube and the heat transfer fluid b outside the tube exchange heat with each other, and their respective temperatures change.

Further, by moving the eccentric shaft 8 by the rotation of the rotating shaft 7 provided in the container D, the heat transfer scroll pipe B in the form of a scroll pipe in which the heat transfer fluid a in the pipe flows inside, and the heat transfer outside the pipe The fluid b is caused to rotate the sliding scroll tube C in the form of a scroll pipe which circulates in the passage outside the tube, and the surface of the sliding scroll tube C slides on the surface of the heat transfer scroll tube B to make the heat transfer scroll tube C. Since the heat transfer surface can be forcibly cleaned by scraping or peeling off impurities such as dust and precipitates attached to the surface of B, the surface of the heat transfer scroll tube B can be automatically cleaned. it can.

FIG. 3 shows a second embodiment of the heat exchanger according to the present invention, wherein a heat transfer scroll tube B and a sliding scroll tube C are shown.
A plurality of containers D in which are internally stacked are vertically stacked,
The heat transfer fluids a and b respectively flow in countercurrent.

Further, the plurality of heat transfer scroll tubes B are connected to each other through a connecting tube 21 so that the heat transfer fluid a in the tube can communicate and flow.

Further, the plurality of containers D are connected to each other via the connecting pipe 22 so that the heat transfer fluid b in the pipe can communicate with each other and flow.

Further, the moving mechanism such as the rotating shaft 7 and the eccentric shaft 8 for displacing the sliding scroll pipe C is formed so that a plurality of sliding scroll pipes C can be synchronously moved by the rotation of the rotating shaft 7. Therefore, although a long heat transfer passage in which both fluids flow countercurrently can be obtained, the increase in volume can be suppressed as much as possible, so that a compact heat exchanger with high temperature efficiency can be obtained.

FIG. 4 shows a third embodiment of the heat exchanger according to the present invention, in which crystallization of dissolved components in the heat transfer fluid and sedimentation of suspended matter in the heat transfer fluid are small, A movement blocking member that has a suitable configuration when a clean heat transfer fluid that adheres to the heat transfer surface as little as possible is used and that restricts the mutual movement of the heat transfer scroll tube B and the sliding scroll tube C. 23 is interposed between the scroll tubes B and C in the container D.

Therefore, the chances of mutual sliding contact between the heat transfer scroll tube B and the sliding scroll tube C are reduced, so that the decrease in the heat transfer coefficient at the time of sliding contact can be reduced as much as possible.

FIG. 5 shows a fourth embodiment of the heat exchanger according to the present invention, in which the brush 9 as a cleaning member is intermittently spaced at a predetermined interval without being densely packed on the surface of the sliding scroll pipe C. Have been planted.

Therefore, since the area where the brush 9 contacts the heat transfer scroll tube B is significantly reduced, it becomes difficult for the brush 9 to prevent convection of the heat transfer fluid on the surface of the heat transfer scroll tube B, and the heat transfer coefficient at the time of contact is reduced. The decrease can be reduced as much as possible.

The heat transfer scroll tube B and the sliding scroll tube C are not limited to the flat tube shape as in the above-described embodiment, but can be an elliptic tube or a circular tube, which is easy to manufacture. There is.

In addition, the heat exchanger is formed by vertically stacking a plurality of containers D in which the heat transfer scroll tubes B and the sliding scroll tubes C are installed as in the above embodiment, and the scroll tubes B are provided in the containers D. It is also possible to stack and form a plurality of sliding scroll tubes C and.

Further, the sliding cleaning of the heat transfer scroll tube B is performed by moving the scroll tube C as in the above embodiment, and by moving both the heat transfer scroll tube B and the sliding scroll tube C mutually. Therefore, there is an advantage that sliding cleaning can be performed more efficiently.

<Effects of the Invention> As described above, according to the present invention, the heat transfer surface can be cleaned by moving the sliding scroll tube on the surface of the heat transfer scroll tube which is the passage of the heat transfer fluid in the tube. Because of the configuration, there is an advantage that a heat exchanger having a small volume can be obtained despite the long heat transfer passage, the device is downsized, and a space-saving type that can be installed even in a narrow place can be obtained.

Further, by moving the sliding scroll tube by the rotation of the eccentric shaft, the surface of the sliding scroll tube slides on the surface of the heat transfer scroll tube and dust or deposits attached to the surface of the heat transfer scroll tube. Since the heat transfer surface can be forcibly cleaned by scraping off or removing impurities such as substances, the heat transfer surface can be cleaned and the flow of the heat transfer fluid outside the pipe can be promoted. There is an advantage that the heat transfer coefficient with the fluid can be increased.

Furthermore, it is necessary to prevent dust and the like from adhering to the heat transfer surface and lowering the heat transfer coefficient without separating or disassembling the casing and the cover plate to clean the heat transfer surface. With the plate still attached to the inside of the container, move the sliding scroll tube and slide the surface of the heat transfer scroll tube on the surface of the sliding scroll tube to adhere to the surface of the heat transfer scroll tube. Since the heat transfer surface can be forcibly cleaned by scraping off and removing impurities such as dust and precipitates, it is possible not only to increase the heat transfer coefficient with the heat transfer fluid in the pipe, but also to maintain and manage it. There is an advantage that it becomes easy.

Therefore, the heat transfer coefficient increases, and the facility cost and maintenance cost can be made extremely low, so that the effect is extremely large.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of an essential part showing a first embodiment of the heat exchanger according to the present invention. FIG. 2 is a vertical sectional front view showing a first embodiment of the heat exchanger according to the present invention. FIG. 3 is a vertical sectional front view showing a second embodiment of the heat exchanger according to the present invention. FIG. 4 is a cross-sectional front view of essential parts showing a third embodiment of the heat exchanger according to the present invention. FIG. 5 is a front view of a main portion of a sliding scroll tube showing a fourth embodiment of the heat exchanger according to the present invention. A ... Heat exchanger, B ... Heat transfer scroll tube C ... Sliding scroll tube, D ... Container a ... Heat transfer fluid in tube, b ... Heat transfer fluid outside tube, 1 ... Casing, 2 ... Cover plate 3, Inlet tube, 4 ... Outlet pipe 5 ... Cylinder side outlet, 6 ... Cylinder side inlet 7 ... Rotating shaft, 8 ... Eccentric shaft 9 ... Cleaning member, 11 ... Core 12 ... Connecting member, 14 ... Pivot bearing 15 ... Bearing, 16 ... Sealing material 17 ... Anti-rotation stopper 18 ... Stopper receiver, 21 ... Connection pipe 22 ... Connection pipe, 23 ... Movement prevention member

Claims (6)

[Claims] 1. A heat transfer tube is provided inside a container comprising a casing and a cover plate, and both ends of the heat transfer tube are connected to an inlet pipe and an outlet pipe provided in the container. In a heat exchanger that exchanges heat between the heat transfer fluid and the external heat transfer fluid, a scroll pipe-shaped heat transfer scroll tube in which the internal heat transfer fluid flows, and an external heat transfer fluid flow in the external passage. An eccentric shaft provided in the container is rotated to slide the surface of the heat transfer scroll tube to scrape off impurities such as dust and precipitates attached to the surface,
A heat exchanger characterized by comprising a sliding scroll pipe in the form of a scroll pipe having a structure for peeling and cleaning. 2. A brush is provided on the outer surface of the sliding scroll tube as a structure for sliding the surface of the heat transfer scroll tube to remove impurities such as dust and deposits adhering to the surface by scraping or peeling. The heat exchanger according to claim 1, further comprising a cleaning member such as. 3. The heat exchanger according to claim 1, wherein the heat transfer scroll tube and the sliding scroll tube are formed in a flat tubular shape. 4. A plurality of containers in which a heat transfer scroll tube and a sliding scroll tube are installed are vertically stacked, and
A plurality of heat transfer scroll tubes are connected to each other so that the heat transfer fluid in the tubes can communicate with each other, and a plurality of sliding scroll tubes are formed in an interlocking manner so as to be synchronously movable by rotation of an eccentric shaft. The heat exchanger according to any one of claims 1 to 3. 5. The heat exchanger according to claim 1, wherein the heat transfer scroll pipe and the sliding scroll pipe move together to perform the cleaning operation. 6. The eccentric shaft is provided on the container via a rotary shaft and is connected to the sliding scroll pipe via a connecting rod and a pivot bearing. The heat exchanger described.