JP3164882B2 - Heat transfer tube automatic cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically cleaning the inside of a heat transfer tube in a batch system by periodically passing a washing body through a heat transfer tube by a water flow.

[0002]

2. Description of the Related Art Conventionally, the following devices have been known as devices for cleaning the inside of a heat transfer tube of a heat exchanger. (1) A brush is inserted into the heat transfer tube, the direction of the water flow is reversed using a four-way switching valve, and the brush moves while rotating by the water flow, so that dirt attached to the inner wall of the heat transfer tube is automatically removed. apparatus. (2) Inject sponge balls into the cooling water of the refrigerator condenser, use the cooling water flow to push the balls into the heat transfer tubes, and always automatically clean the scale adhering to the heat transfer tube inner surface during operation. A device designed to do so.

[0003]

However, in the above method (2), a plurality of automatic switching valves and a partition valve in a ball vessel are required, and the structure becomes complicated, and a large space for installation is required. That is, there is a problem that an expensive and large-sized device is required. In addition, the method (1) requires a large four-way switching valve and has a problem that the chiller / heater must be stopped during cleaning. The present invention has been made in view of the above points,
Automatic cleaning can be performed with a simple configuration without an automatic valve or with a single automatic valve, and it can be incorporated into equipment having a heat transfer tube such as a heat exchanger. It is an object of the present invention to provide a heat transfer tube automatic cleaning device that does not need to be provided.

[0004]

In order to achieve the above object, an automatic heat transfer tube cleaning apparatus according to the present invention, as shown in the drawings, comprises a heat transfer tube of a shell and tube type heat exchanger.
In the heat transfer tube cleaning device for cleaning the inside of the tube 12 using a cleaning body 30 containing water and having a specific gravity of greater than 1 , a heat exchanger is provided below the outlet header 14 of the heat transfer tube 12 .
Closed by supply of cooling water to
Cleaning body reservoir 16 connected via a check valve C which opens
To connect the cleaning body reservoir 16 and the inlet header 18 of the heat transfer tube, and open when the cooling water is supplied to the heat exchanger.
Cleaning body transfer pipe 2 provided with check valve B through which 30 can pass
0, a water supply pipe 28 connecting the washing body reservoir 16 and the water inlet 26 of the inlet header, and water in the washing body reservoir 16.
The cleaning body 30 provided near the connection with the supply pipe 28 is
A porous body 36 for preventing passage , a porous body 32 for cleaning body recovery provided near the water outlet 22 of the outlet header,
The pressure difference between the water inlet 26 and the inlet header 18 provided near the connection between the water inlet 26 and the inlet header 18 is reduced.
An orifice plate 34 to produce, is characterized in that it consists of. The water supply pipe 28 may be provided with an automatic switching valve A.

[0005]

As shown in FIG. 1, when the cooling water is supplied to the heat exchanger 10, the washing body 30 flows out of the washing body reservoir 16, passes through the check valve B, and becomes a heat exchanger (for example, an absorption refrigerator).・ Supplied to the absorber or condenser of the chiller / heater. At this time, the check valve C is closed. While the cleaning body 30 passes through the heat transfer tube, the inside of the heat transfer tube is brushed. The cleaning body 30 that has flowed out of the heat transfer tube accumulates below the outlet header 14. The specific gravity of the cleaning body 30 is set to be slightly larger than 1 in a state where the cleaning body 30 contains water . Then, as shown in FIG.
When the supply of the cooling water to the heat exchanger 10 is stopped, the pressure in the washing body reservoir 16 becomes equal to the pressure at the bottom of the outlet header 14, so that the check valve C is opened and the pressure is accumulated at the bottom of the outlet header 14. The cleaning body 30 moves to the cleaning body reservoir 16 by its own weight.

As shown in FIG. 3, when the automatic switching valve A is opened while the cooling water is supplied to the heat exchanger 10,
The washing body 30 flows out of the washing body reservoir 16, passes through the check valve B, and is supplied to a heat exchanger (for example, an absorber or a condenser of an absorption refrigerator / cooled / hot water machine). At this time, the check valve C is closed. While the cleaning body 30 passes through the heat transfer tube, the inside of the heat transfer tube is brushed. The cleaning body 30 that has flowed out of the heat transfer tube accumulates below the outlet header 14. In addition,
The specific gravity of the cleaning body 30 is set to be slightly larger than 1 in a state where the cleaning body 30 contains water . Next, as shown in FIG. 4, when the automatic switching valve A is closed, the pressure in the washing body reservoir 16 becomes equal to the pressure at the bottom of the outlet header 14, so that the check valve B is closed and the check valve C is closed. Open. When the operation of the heat exchanger 10 is further stopped and the supply of the cooling water to the heat exchanger 10 is stopped, the cleaning body 30 stored at the bottom of the outlet header 14 moves to the cleaning body reservoir 16 by its own weight. Perform the above operations as needed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to them, unless otherwise specified. This is just an example. Embodiment 1 In FIGS. 1 and 2, reference numeral 10 denotes a heat exchanger, for example, an absorber or condenser of an absorption refrigerator or a chiller / heater, and an outlet header 14 of a heat transfer pipe (cooling water pipe) 12 of the heat exchanger 10. The washing body reservoir 16 is connected to the lower portion of the washing machine via a check valve C.
The side of the cleaning body reservoir 16 and the inlet header 18 of the heat transfer tube are connected via a cleaning body transfer pipe 20 having a check valve B. Further, the washing body reservoir 16 and the water inlet 26 of the inlet header 18 are connected via a water supply pipe 28. In the vicinity of the water outlet 22 of the outlet header 14 and at the bottom of the cleaning body reservoir 16, porous bodies 32 and 36 for preventing the cleaning body 30 from passing therethrough are provided. The porous body 32 is a filter for collecting the cleaning body. An orifice plate 34 for generating a pressure difference is provided near the water inlet 26 of the inlet header 18. 38
Is a fluid inlet and 40 is a fluid outlet.

As the cleaning body 30, a sphere, a triangular body, a polygonal body, a spiral body, or the like, which contains water and has a specific gravity larger than 1 is used. When a sphere is used, it is particularly preferable to use a sponge ball or rubber ball having a diameter slightly larger than the inner diameter of the heat transfer tube. Further, in order to facilitate the transfer of the cleaning body 30, the inner diameter of the cleaning body transfer pipe 20 is set to be larger than the inner diameter of the heat transfer pipe.

Embodiment 2 In this embodiment, as shown in FIG. 3 and FIG.
Provided with an automatic switching valve A. Other configurations are the same as those in the first embodiment.

[0010]

As described above, the present invention has the following effects. (1) With a simple configuration, the inside of the heat transfer tube can be automatically cleaned. (2) Since it can be configured compactly, the installation space may be small, it can be easily incorporated into the device, and the operation is simple.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a heat transfer tube automatic cleaning device of the present invention, in which cooling water is supplied to clean the inside of a heat transfer tube.

FIG. 2 is an explanatory diagram showing a state in which supply of cooling water is stopped in FIG.

FIG. 3 is a view showing another embodiment of the apparatus of the present invention, in a state where cooling water is supplied to clean the inside of the heat transfer tube (the automatic switching valve is opened).

FIG. 4 is an explanatory diagram showing a state in which the supply of cooling water is stopped (the automatic switching valve is closed) in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat exchanger 12 Heat transfer tube 14 Outlet header 16 Wash body reservoir 18 Inlet header 20 Wash body transfer pipe 22 Water outlet 26 Water inlet 28 Water supply pipe 30 Wash body 32 Porous body 34 Orifice plate 36 Porous body 38 Fluid inlet 40 Fluid outlet A Automatic switching valve B Check valve C Check valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28G 9/00 F28G 1/12

Claims (2)

(57) [Claims] The specific gravity of the heat transfer tube (12) of the shell-and-tube heat exchanger is greater than 1 in a water-containing state.
In a heat transfer tube cleaning apparatus for cleaning using a cleaning body (30) , heat exchange is provided below an outlet header (14) of a heat transfer tube (12).
Closed by supply of cooling water to the vessel and supply of cooling water is stopped
Then, the washing body reservoir (16) connected via the check valve (C) which is opened, and the washing body reservoir (16) and the inlet header (18) of the heat transfer tube are connected to the heat exchanger. Opened and washed when supplying cooling water
A cleaning body transfer pipe (20) having a check valve (B) through which the cleaning body (30) can pass, and a water supply pipe connecting the cleaning body reservoir (16) and a water inlet (26) of an inlet header. (28) and the water supply pipe (28) in the washing body reservoir (16).
Do not pass through the cleaning body (30) provided near the connecting portion.
(36) for cleaning, a porous body (32) for cleaning body provided near the water outlet (22) of the outlet header, and near the connection between the water inlet (26) and the inlet header (18). , Water inlet (26) and inlet header (18)
Orifice plate that creates a pressure difference between
4) An automatic heat transfer tube cleaning device comprising: 2. The automatic heat transfer tube cleaning apparatus according to claim 1, wherein an automatic switching valve (A) is provided in the water supply pipe (28).