JPH0229562A - Plate-type heat exchanger - Google Patents

Abstract

PURPOSE:To make the best use of the heat of liquid including muck by allowing a heat medium to flow through inside a plate and a muck-including liquid to flow down on the surface of said plate at the same time, exchanging heat between both the heating medium and the liquid, and removing the stain with a brush when it is detected that the stain has reached a specified value. CONSTITUTION:Refrigerant gas sent from a compressor is adapted to enter a plate 1 from an upper head 2 and exchange heat with sewage flowing through the surface of the plate 1 by way of the plate 1 in the process of passing through inside. The refrigerant gas, after condensed and liquefied as a result the aforesaid heat exchange enters a lower head 3 and circulates in the compressor by way of a liquid receiver and an evaporator. When the stain adheres to the surface of the plate 1, the heat transfer performance of the plate 1 drops while the condensation temperature of the refrigerant or its pressure rises. A drive shaft 14 rotates periodically and reciprocally on signals transmitted from a temperature sensor or a pressure sensor which has detected the drop or the rise. A brush 10 is designed to remove the stain adhered to the surface by performing vertical and reciprocation motion between the upper end and the lower end of the plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a plate-type heat exchanger suitable for a heat source side heat exchanger of a heat pump using raw sewage as a heat source.

(Conventional technology and its problems) Raw sewage from urban wastewater has a temperature of about 12℃ in winter and about 25℃ in summer.
Since it maintains a stable temperature of ℃ and is present in large quantities in urban areas, it is being considered to use it as a heat source for heat pumps.

However, raw sewage contains various filth,
When this raw sewage is introduced into the heat exchanger on the heat source side of the heat pump, the filth contained in the raw sewage may block the raw sewage flow path of the heat exchanger on the heat source side or adhere to the heat transfer surface, preventing the heat pump from operating smoothly. There was a problem that I couldn't do it.

(Means for Solving the Problems) The present invention was invented to solve the above problems, and its gist is to provide a device that is installed substantially vertically and through which a heat medium flows. means for causing a liquid containing dirt to flow down onto the surface of the plate, a brush that contacts the surface of the plate, a brush moving mechanism that moves the brush along the surface of the plate, and a surface of the plate. The plate heat exchanger is characterized by comprising: a detection means for detecting the degree of contamination of the plate; and a drive means for operating the brush moving mechanism in response to a signal from the detection means.

(Function) Since the present invention has the above-mentioned configuration, a heat medium is caused to flow inside the plate, and at the same time, a liquid containing dirt is made to flow down on the surface of the plate, thereby causing heat exchange between the two. When the detection means detects that the amount of dirt adhering to the plate surface has reached a specified value, the drive means receives a signal from the detection means to operate the brush moving mechanism, thereby moving the brush along the surface of the plate. The brush removes dirt adhering to the surface of the plate.

(Example) One embodiment of the invention is shown in FIGS. 1 and 2.

In Figures 1 and 2, 1 is a flat plate;
They are substantially vertically erected so as to be parallel to each other with a minute interval between them. The upper ends of these plates 1 are connected to the upper lid 2, the lower ends are connected to the lower header 3, and both side edges are closed by end plates 4.

A trough 5 extending throughout the plate 1 is disposed horizontally close to the top of the plate 1, and sewage is supplied into the trough 5 from a sewage header 6 through a plurality of branch pipes 7. It has become.

lO is a brush that contacts the surface of plate 1, and bar 11
is fixed. Both ends of the bar 11 are fitted into guides 12 that extend vertically, and both ends are secured to endless bands 13 such as chains or belts. These endless belts 13 are connected to the pulley 1 fixed to the drive shaft 14.
5 and a pulley 17 fixed to a driven shaft 16.

The drive shaft 14 extends horizontally close to and parallel to the upper part of the plate 1, is rotatably supported by a bearing 18, and is interlocked with a motor 19 capable of forward and reverse rotation. Further, the driven shaft 16 extends horizontally in parallel to the lower part of the plate l, and is rotatably supported by a bearing 20.

Further, a sewage reservoir 21 is provided below the lower header 3.

Therefore, when the heat pump is operating, the waste water flows into the waste water header 6.
The water enters the trough 5 through a plurality of branch pipes 7, overflows from the upper end of the wall on the plate l side, and flows down from the upper end of the plate l along its surface in the form of a thin film of uniform thickness.

On the other hand, the gas refrigerant sent from the compressor enters the plate 1 from the upper header 2, and in the process of flowing inside the plate 1, it condenses and liquefies by exchanging heat with the waste water flowing on the surface of the plate 1 via the plate 1. The liquid enters the lower bender 3, and from there it is circulated to the compressor via a liquid receiver, an evaporator, etc. (not shown).

The sewage heated by flowing on the surface of the plate 1 falls into the sewage pool 21 and is discharged through a flow path (not shown).

If the contaminants contained in the wastewater adhere to the surface of the plate 1 due to continued operation, the heat transfer performance of the plate 1 will decrease and the condensation temperature or pressure of the refrigerant will increase. If the condensation temperature or pressure of the refrigerant rises above the specified value,
The motor 19 is automatically activated by a signal from the temperature sensor or pressure sensor that detects this, and the drive shaft 14 periodically rotates in forward and reverse directions.

Then, the driven shaft 16 rotates via the pulley 15, the endless band 13, and the pulley 17, and the rod 11, which is locked to the endless band 13, is guided by the guide 12 and moves up and down. Thus, the brush 10 fixed to the rod 11 moves back and forth up and down between the upper and lower ends of the plate 1 while contacting the surface of the plate 1, mechanically removing dirt adhering to the surface of the plate 1. Clean the surface of plate l.

When the detected value of the temperature sensor or pressure sensor returns to a normal value, or after the brush 10 has reciprocated a predetermined number of times, the motor 19 stops.

In the above embodiment, the waste water is allowed to flow down only on one surface of the plate 1, but it is also possible to make the waste water flow down on both surfaces, and in this case, it is necessary to provide a brush that contacts the other surface. There is.

Further, in the above embodiment, the refrigerant is condensed within the plate 1, but the refrigerant can be evaporated within the plate 1.

Further, in the above embodiment, contamination on the surface of the plate 1 is detected by detecting the condensation temperature or pressure of the refrigerant, but contamination can also be detected by optical or mechanical means.

Further, in the above embodiment, the brush reciprocates up and down, but it may also reciprocate horizontally, or the entire surface of the plate 1 may be wiped while the brush rotates.

In the above embodiment, heat is exchanged between a refrigerant and waste water, but it goes without saying that the present invention can also be applied to a plate-type heat exchanger that exchanges heat between a heat medium and a liquid containing waste.

(Effects of the Invention) The present invention includes a plate that is substantially vertically erected through which a heating medium flows, a means for causing a liquid containing dirt to flow down onto the surface of the plate, and a means for causing a liquid containing dirt to flow down onto the surface of the plate. A brush in contact with the brush, a brush moving mechanism for moving the brush along the surface of the plate, a detecting means for detecting the degree of dirt on the surface of the plate, and a brush moving mechanism in response to a signal from the detecting means. Since it is provided with a drive means for actuation, heat exchange is performed between the heat medium by flowing the heat medium into the inside of the plate and at the same time causing the liquid containing dirt to flow down on the surface of the plate. and,
When the detection means detects that the amount of dirt adhering to the plate surface has reached a specified value, the drive means that receives a signal from the detection means operates the brush hand multi-shift mechanism to move the brush along the surface of the plate. The brush can be used to remove dirt adhering to the surface of the plate.

Therefore, it is possible to automatically prevent a decrease in heat transfer performance due to dirt on the plates, allowing continuous operation of the heat exchanger, and making it possible to effectively utilize the heat of the liquid containing dirt.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, with FIG. 1 being a perspective view of the main parts, and FIG. 2 being a schematic side view. Plate--1, liquid flowing means-5, 6, 7, brush 10, brush moving mechanism--11.12.13.14
．． 15.16.17, Drive means...19

Claims (1)

[Claims] a plate that stands substantially vertically through which a heating medium flows; a means for causing a liquid containing dirt to flow down onto the surface of the plate; and a brush that contacts the surface of the plate;
A brush moving mechanism for moving the brush along the surface of the plate, a detecting means for detecting the degree of dirt on the surface of the plate, and a driving means for operating the brush moving mechanism in response to a signal from the detecting means. A plate type heat exchanger characterized by: