JP3275158B2 - Heat exchanger for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for an air conditioner which is most suitable when the refrigerant passing through a heat exchange coil is water or brine mixed with fine ice.

[0002]

2. Description of the Related Art Generally, a heat exchanger used in an air conditioner is formed by inserting a pipe constituting a plurality of heat exchange coils common to a group of fins in which a plurality of fins are arranged in parallel at regular intervals. An inlet header that can supply the refrigerant to all the heat exchange coils in common is provided below the refrigerant inlet side of the heat exchange coil, and all the heat exchange coils pass through the refrigerant outlet side of the heat exchange coil. In this structure, an outlet header for collecting the refrigerant is provided above, and both the inlet header and the outlet header are mounted horizontally.

[0003]

In the heat exchanger having such a structure, there is no problem when the refrigerant passing through the heat exchange coil is water, but the heat transfer capacity is not limited to sensible heat but also to latent heat. If the refrigerant is water or brine mixed with micro ice to efficiently cool the fins, the specific gravity of the ice is lighter than water or brine, so the ice is sent from the refrigerator and enters the header on the inlet side. The micro ice in the refrigerant rises to the top of the header tube, and the header itself is horizontal, so when the refrigerant has a normal flow rate, it is dispersed so as to form a layer of the same thickness on the upper wall surface of the header tube, Approximately the same amount of micro ice enters each heat exchange coil from the refrigerant inlet of each heat exchange coil, and is melted into water by heat exchange between the fins and air while passing through the heat exchange coil. Returned to the refrigerator from the outlet header Become of it.

The air passing through the gap between the fin groups has the highest temperature on the inlet side and heat exchange is performed quickly. Therefore, the fine ice in the refrigerant passing through the heat exchange coil located closest to the air inlet is formed. It is robbed of latent heat and melts in a short time,
As the temperature of the air decreases as you approach the exit,
Heat exchange is slowed down, and some of the micro ice in the refrigerant passing through the heat exchange coil near the outlet flows into the outlet side header without melting.

[0005] As described above, the fact that the amount of micro ice contained in the refrigerant passing through the heat exchange coils of all rows is the same amount means that the latent heat of the micro ice is completely at the inlet side of the air having a large heat load. It can be used, but at the exit side of the air with a small heat load, it is not possible to use the latent heat of the micro ice completely, so that it is not only wasted, but also the heat exchange efficiency with the air is poor and the cooling capacity is low. There was a problem that it was low.

Further, when the flow rate of the refrigerant is low or when the cooling operation is stopped, the flow of the refrigerant is slowed or stopped. Therefore, the amount of the minute ice remaining in the heat exchange coil having the smallest heat load is large. There was a problem that the fine ices gathered and solidified in the horizontal portion of the pipe to form a lump, which blocked the pipe and prevented the refrigerant from flowing smoothly.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention supplies a large amount of fine ice to a heat exchange coil on the inlet side of the air having a large heat load, and supplies the fine ice toward the outlet side. To provide a heat exchanger for an air conditioner capable of distributing the heat in a small amount to achieve the full utilization of latent heat and preventing blockage of the pipe due to solidification of micro ice remaining in the pipe of the heat exchange coil. It is intended to do so.

[0008]

DISCLOSURE OF THE INVENTION A heat exchanger for an air conditioner according to the present invention comprises:
A plurality of fins are inserted through a pipe constituting a plurality of heat exchange coils in common to a group of fins arranged in parallel at regular intervals, and all are inserted into a refrigerant inlet, which is an end of a lowermost pipe of the heat exchange coil. The inlet side header that can supply the refrigerant commonly to the heat exchange coil is provided below, and the outlet side header that collects the refrigerant that has passed through all the heat exchange coils is provided above the refrigerant outlet side of the heat exchange coil. In the heat exchanger for an air conditioner, the inlet side header is inclined with respect to a horizontal line such that the inlet side of the refrigerant of the inlet side header is located above the refrigerant inlet of the heat exchange coil. Is what you do.

[0009]

The micro-ice contained in the refrigerant entering from the inlet of the inlet side header rises upward due to its buoyancy, and is dispersed along the upper wall surface of the inclined header tube toward the end of the header. Since the refrigerant intake of the heat exchange coil closest to the group air inlet is in the highest density area of the micro ice in the header tube, the amount of micro ice contained in the refrigerant passing through the heat exchange coil is It is maximum, and the amount of micro ice decreases as approaching the outlet, and the amount of micro ice contained in the refrigerant passing through the heat exchange coil closest to the outlet becomes minimum.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat exchanger of the present invention will be specifically described with reference to the drawings. FIG. 1 is a front view of the heat exchanger of the present invention, and FIG.
FIG. 1 is a side view of the heat exchanger, wherein 1 is a fin for heat exchange, and a plurality of fins are arranged in parallel at regular intervals to form a fin group 1A. Reference numeral 2 denotes a pipe constituting a plurality of heat exchange coils, which is commonly inserted through the fin group 1A, and ends of the pipes in the same row are connected by a U-shaped tube so as to be in a continuous state. . Reference numeral 3 denotes an inlet header for supplying the refrigerant from the refrigerant inlet, which is the end of the pipe 2 at the lowermost end of the heat exchange coils in all the rows, and the refrigerant is supplied to the outlet side of the air passing through the fin group 1A. Inlet 3
1, the header 3 is connected to a refrigerant inlet, which is an end of the lowermost pipe 2, on a line segment having an inclination angle α when the header 3 is placed horizontally as shown in FIG. Holes 32 are formed. Therefore, when the holes 32... 32 are fitted to the respective refrigerant inlets, the header 3
Is attached to the fin group 1A in a state of being inclined by an angle of α. The inclination angle of the header 3 was set by an experiment. As a result of the experiment, when the flow rate of the refrigerant was 1 m / sec, the inclination angle was optimally set to about 2 degrees.

Reference numeral 4 denotes an outlet header for returning the refrigerant passing through the heat exchange coils from the ends of the pipes 2 at the uppermost end of all the rows to a refrigerant supply source such as a refrigerator. Is provided with a refrigerant outlet 41, and the header 4 is mounted horizontally unlike the header 3 on the inlet side, but may be mounted to be inclined so as to be symmetrical with the header 3 on the inlet side. is there. In the drawing, reference numerals 5 and 5 denote side plates that also serve to reinforce the fin group.

When a coolant composed of water or brine mixed with micro-ice is sent into the header from the inlet 31 of the inlet-side header 3, the micro-ice in the refrigerant rises due to its buoyancy and moves along the upper wall surface of the pipe of the header 3. However, since the density of the micro ice is higher near the upper wall of the tube, it passes through the heat exchange coil closest to the inlet of the air to which the refrigerant is supplied from the portion closest to the upper wall of the tube. The amount of micro ice contained in the refrigerant is the largest, the amount of micro ice decreases as approaching the outlet, and the amount of micro ice contained in the refrigerant passing through the heat exchange coil closest to the outlet becomes the minimum . The refrigerant that has passed through each heat exchange coil is collected by the outlet header 4 and returned from the outlet 41 to the supply source of the refrigerant.

When the flow rate of the refrigerant is very low, the portion of the inlet header 3 close to the inlet 31 is high, and fine ice may collect at this portion and not flow to the end. In order to make the header 3 horizontal and improve the flow, as shown in FIG.
It may be used by inclining only.

[0014]

According to the heat exchanger for an air conditioner according to the present invention, a large amount of fine ice is supplied to the heat exchange coil on the inlet side of the air having a large heat load, and the minute ice is supplied toward the outlet side. Is distributed so as to reduce the supply amount of micro ice, so that the latent heat of the micro ice is completely utilized, so that the micro ice passes through the heat exchange coil in a state in which the micro ice does not melt as in a conventionally known heat exchanger. There is no waste as it is returned to the supply source of the refrigerant as it is, heat exchange efficiency with air is good, cooling efficiency is increased, and micro ice does not remain in the pipe of the heat exchange coil Therefore, when the operation is stopped, there is no blockage of the pipe due to solidification of the fine ice.

[Brief description of the drawings]

FIG. 1 is a front view of the heat exchanger of the present invention.

FIG. 2 is a side view of the heat exchanger of the present invention.

FIG. 3 is an enlarged front view showing an inclined state of a header.

FIG. 4 is a side view showing another embodiment of the heat exchanger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fin 1A Fin group 2 Pipe 3 Inlet header 4 Outlet header

Claims (2)

(57) [Claims] 1. A plurality of fins in which a plurality of fins are arranged in parallel at regular intervals, a pipe constituting a plurality of heat exchange coils is inserted in common, and an end of the lowermost pipe of the heat exchange coils is provided. An inlet side header that can supply the refrigerant commonly to all the heat exchange coils is provided below the refrigerant inlet, and an outlet side that collects the refrigerant that has passed through all the heat exchange coils to the refrigerant outlet side of the heat exchange coil. In the heat exchanger for an air conditioner provided with the header above, the inlet header is inclined with respect to the horizontal line such that the refrigerant inlet side of the inlet side header is located above the refrigerant inlet of the heat exchange coil. A heat exchanger for an air conditioner. 2. The heat exchanger for an air conditioner according to claim 1, wherein the heat exchanger for the air conditioner according to claim 1 is inclined so that an inlet header is horizontal.