JPH07180990A - Plate fin and tube type heat-exchanger - Google Patents

Abstract

PURPOSE:To perform easy and effective washing and removal of corrosion products accumulated on the surface of a plate fin. CONSTITUTION:At least one tube of a tube group 2 forms a tube 5-1 for washing. A number of washing liquid injection nozzles are formed in the outer periphery thereof and a hose connection part (a hose connection pipe 5-2) for washing is formed at the one end of the tube 5-1, and washing liquid is injected against the tube group 2 through the washing injection nozzles of the tube 5-to effect washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate fin-and-tube heat exchanger for air conditioning or freezing of a vehicle which is composed of a plate fin and a tube group.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional general plate fin-and-tube heat exchanger. This plate fin-and-tube heat exchanger has a configuration in which a large number of plate fins 1 each having a surface in a direction orthogonal to a group of tubes (tubes) 2 arranged in parallel are arranged in parallel. To the respective tubes 2, and after heat exchange with air, they are joined to the outlet header 4 and discharged, and have a function of flowing the refrigerant to all the tubes.

[0003]

In the conventional plate fin-and-tube heat exchanger described above, when it is used for vehicles, it runs on unpaved roads during rain and expressways during the winter season when anti-freezing agents are sprayed. As a result of running, corrosion products (sodium chloride, calcium chloride, sulfur oxides, etc.) are deposited between plate fins of the heat exchanger while repeating alternate dry and wet conditions. These are the number of rows of tube groups (thickness)
If the amount is small, it can be easily discharged and washed by pouring tap water from the outer surface, but in the multi-row plate fin-and-tube heat exchanger, the corrosion products accumulated on the inner surface are removed by the same method. Is difficult. Another method using high-pressure washing water has a drawback that the fins are tilted by the water pressure and the smooth flow of air is impeded, thereby impairing the original heat exchange performance. In addition, the corrosion products that are not eliminated accelerate the corrosion of the plate fin material and the tube material, resulting in a shortcoming of impairing the original function.

The present invention is intended to provide a plate fin and tube heat exchanger which can solve the above drawbacks.

[0005]

The present invention has taken the following means. (1) In a plate fin-and-tube type heat exchanger, at least one tube of a tube group is used as a cleaning tube, and a large number of cleaning solution ejection holes are formed on the outer periphery of the tube, and a cleaning hose is provided at one end of the tube. It is characterized in that a connection portion is formed. (2) In the plate fin-and-tube heat exchanger of (1) above, a plurality of the cleaning tubes are provided, one end of each tube is connected by a header, and the cleaning hose connection portion is formed in the header. It is characterized by (3) In the plate fin-and-tube heat exchanger according to (1) or (2), the cleaning hose connection part is provided with a removable plug.

[0006]

In the present invention of the above (1), when the cleaning hose is connected to the cleaning hose connection portion and a cleaning liquid such as tap water is supplied from the cleaning hose, the cleaning liquid is supplied to the cleaning tubes in the tube group. Corrosion products ejected from the cleaning liquid ejection holes and accumulated between the surface of the plate fin and the plate fin are easily removed.

According to the present invention of (2) above, in addition to the operation of the present invention of (1) above, a cleaning hose can be easily connected to the cleaning hose connection portion of the header, and a plurality of cleaning hoses can be cleaned. The cleaning liquid is ejected from the cleaning tube to effectively remove the corrosion products.

According to the present invention of (3) above, in addition to the functions of the present invention of (1) and (2) above, the cleaning tube and the header are attached to the cleaning hose connection portion when cleaning is not performed. Since it is closed by the stopper, it is not contaminated and clogging does not occur in these parts.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention relating to a plate fin and tube heat exchanger in a vehicle air conditioner / refrigerator will be described with reference to FIGS. In the figure, the plate fin 1, the tube group 2, the inlet header 3 and the outlet header 4 are the same as those in the conventional plate fin and tube heat exchanger shown in FIG. A cleaning pipe assembly 5 is shown in detail in FIG.

The cleaning pipe assembly 5 includes a header 5-5 and a plurality of cleaning tubes 5-1 each having one end connected to the header 5-5 and arranged in parallel with each other, and the outer circumference of each cleaning tube 5-1. A large number of cleaning liquid ejection holes 5-4 are formed over the entire length of the. A hose connecting pipe 5-2 as a connecting portion of a flexible hose for cleaning is provided at a substantially central portion of the header 5-5.
2 is provided with a removable plug 5-3.

Cleaning tube 5 of the cleaning pipe assembly 5
1 is mounted in a heat exchanger, arranged parallel to the tubes of the tube group 2 and forming a part of the tube group 2, and is closely attached to the plate fin 1 similarly to the tube group 2. Will be placed. Further, the header 5-5 and the hose connection pipe 5-2 are arranged so as to be located outside the heat exchanger as shown in FIG.

In this embodiment, when cleaning the plate fins 1 and 1, the plug 5-3 is removed from the hose connecting pipe 5-2, and the hose connecting portion 5-2 is used as a cleaning hose. Connect and supply cleaning liquid such as tap water from the cleaning hose. The cleaning liquid enters from the header 5-5 into the plurality of cleaning tubes 5-1 in the heat exchanger, and the cleaning liquid ejection holes 5
Eject from -4. Thus, the cleaning liquid ejected into the heat exchanger can easily and effectively remove the corrosion product accumulated between the surface of the plate fin 1 and the plate fin 1.

Further, the hose connecting pipe 5-2 provided on the header 5-5 is outside the heat exchanger so that the cleaning hose can be easily connected, and the cleaning pipe assembly 5 is
When the cleaning is not performed, the hose connection pipe 5-2 is closed by the plug 5-3, which prevents the inside of the cleaning pipe assembly 5 from being contaminated and causing clogging.

In the above embodiment, the cleaning tube 5 is used.
Although a plurality of -1 are provided, the number can be one, and in this case, the header is omitted and the end of one cleaning tube is used as a hose connection pipe.

[0015]

As described above in detail, according to the present invention, in the plate fin-and-tube heat exchanger, the entire surface of the plate fin can be easily cleaned without impairing the basic structure of the heat exchanger. It can be performed. Therefore, it is possible to prevent the deterioration of the basic heat dissipation characteristics due to the clogging caused by the adhesion of deposits and the corrosion / deterioration of the constituent materials due to the corrosion products, and to improve the performance of the plate fin-and-tube heat exchanger for a long time. -The life can be secured.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a cleaning pipe assembly of the embodiment.

FIG. 3 is a perspective view of a conventional general plate fin-and-tube heat exchanger.

[Explanation of symbols]

 1 Plate Fin 2 Tube Group 3 Inlet Header 4 Outlet Header 5 Cleaning Piping Assembly 5-1 Cleaning Tube 5-2 Hose Connection 5-3 Plug 5-4 Cleaning Solution Jet Hole 5-5 Header

Claims (3)

[Claims] 1. In a plate fin-and-tube heat exchanger, at least one tube of a tube group is used as a cleaning tube, and a large number of cleaning liquid ejection holes are formed on the outer periphery of the tube, and cleaning is performed at one end of the tube. A plate fin-and-tube heat exchanger, characterized in that a hose connection portion is formed. 2. The plate according to claim 1, further comprising a plurality of the cleaning tubes, one end of each tube being connected by a header, and the cleaning hose connection portion being formed on the header. Fin-and-tube heat exchanger. 3. The plate fin and tube heat exchanger according to claim 1, wherein the cleaning hose connection part is provided with a removable plug.