JPH03105181A - Antifreezing device for heat exchanger - Google Patents

Abstract

PURPOSE:To effect stabilized heat pump operation by a method wherein a discharging pipe is provided with an expanded pipe, which becomes a heat exchanging part, and one end of a heat pipe is connected to the expanded pipe while the other end of the same is connected to a cooling unit below the heat exchanger to melt frost or ice, frosting on the heat exchanger, by the heat of high-temperature high-pressure refrigerant in the discharging pipe through the heat pipe. CONSTITUTION:The discharging pipe 24 of a compressor 23 is provided with a heat exchanging part 25 while the heat exchanging part 25 is equipped with an expanded pipe 29, to which one ends of heat pipes 27, 28 are connected. When room heating operation is effected, a heat exchanger 21 functions as an evaporator and the lower part of the heat exchanger 21 is frosted, however, the frost is heated by high- temperature high-pressure refrigerant, which flows thereinto from the discharging pipe 24, through fins 33 whereby medium in the heat pipes 27, 28 is evaporated and flows into the cooling part 32 of the heat exchanger 21 to effect heat exchange and melt frost and ice. The medium in the heat pipes 27, 28 is liquefied and returned into the expanded pipe 29 again while being guided by a wick 25, then, is heated to eliminate the frosting or freezing, generated on the lower part of the heat exchanger 21, whereby stabilized heat pump operation may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an antifreeze device for a heat exchanger of an air conditioner.

BACKGROUND OF THE INVENTION Conventionally, in this type of outdoor unit of an air conditioner, a heat exchanger 5 is mounted on a metal frame 1 supported by two metal legs 13, as shown in FIG. , the frame 1 has a lower part of the heat exchanger 6? Hole 2 is provided at the barrel location. Hairpin tubes 8 constituting a refrigerant circuit are incorporated into the heat exchanger 6, and each hairpin tube 8
The U-bend tube 9 connects one refrigerant circuit. The heat exchanger 6 is guarded by the hairpin tube 8 and the aluminum fins 1o that are in close contact with the hairpin tube 8. Output 08 of the hairpin tube 8
A and an inlet 8b are connected to a copper pipe 6 and a copper pipe 7, the copper pipe 7 is connected to a three-way valve (not shown), and the copper pipe 6 is connected to a four-way valve 4 for switching the refrigerant circuit. There is. A compressor 3 is fixed on the frame 1, and a discharge pipe 11 of the compressor 3
The kayak and suction pipe 12 were connected to the four-way valve 4.

Problems to be Solved by the Invention In such a conventional configuration, during heating operation, a low-pressure, low-temperature refrigerant whose pressure is reduced by a pressure reducing device such as an expansion valve (not shown) flows through the copper pipe 7, and heat is released. It passes through the inlet part 8b' of the exchanger 6, evaporates in the heat exchanger 6, flows out to the outlet part 8b,
It passes through the four-way valve 4 and returns to the compressor 3. When this refrigerant evaporates in the heat exchanger 6, if the temperature of the refrigerant is above zero degrees, the condensed water droplets will be drained to the outside through the holes 2 of the frame 1, but if the temperature of the refrigerant exceeds zero degrees In this case, the water droplets condensed on the fins 10 of the heat exchanger 5 will freeze.

For this reason, the refrigerant circuit is temporarily switched using the four-way valve 4 as a defrost, and the already frozen ice is melted by the high-pressure, high-temperature refrigerant flowing into the heat exchanger 6. At this time, the thawed water is drained into a reservoir at the bottom of the frame 1 and is gradually drained through the hole 2, but when the four-way valve 4 is switched again and heating operation is resumed, the refrigerant that flows into the heat exchanger 6 again is Due to the low pressure and low temperature, the water droplets adhering to the fins 10 of the heat exchanger 6 freeze, and the water collected at the bottom of the frame 1 freezes due to the temperature of the heat exchanger 6, blocking the drainage hole 2. Deshi1u. For this reason, each time the defrost is performed, the thawed water accumulates at the bottom of the frame and freezes, so as this ice develops, heat exchange in the heat exchanger 5 becomes insufficient. 77 (not shown) provided in front of the heat exchanger 6,
The problem was that the fans were destroyed.

The present invention is intended to solve the above-mentioned problems, and aims to prevent the water accumulated in the lower part of the heat exchanger and the bottom of the frame from freezing.

Means for Solving the Problem In order to solve this problem, the present invention provides an expansion tube forming a heat exchanger in the discharge pipe of the compressor, and one end of a heat pipe equipped with a fin is arranged in the expansion tube. At the same time, the other end is connected to the lower part of the heat exchanger on the outdoor side, and is equipped with a cooling part in which a heat pipe is inserted into the insertion hole. This is an antifreeze device for heat exchangers that is designed to melt ice and ice.

Function: With this configuration, the high-temperature refrigerant discharged from the discharge pipe heats the heat pipe within the expansion tube, and this heated vapor is sent to the cooling section in the lower part of the heat exchanger, which acts as an evaporator. This prevents frost formation and icing on the lower part of the heat exchanger and facilitates smooth drainage.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 2, a heat exchanger 21 on the outdoor unit side is provided on a frame 20, and holes 22 are provided for draining condensed water generated from the heat exchanger 21. On the other hand, a discharge pipe 24 from the compressor 23 is provided with a heat exchange section 25 formed in the shape of a container, and this heat exchange section 25 is connected to a four-way valve 26. The heat exchange section 26 includes a heat pipe 27. The heat pipe 27 . The other end of the heat pipe 27.28 is inserted into the insertion hole 30.31 provided below the heat exchanger 21, and is inserted to a length that is approximately the full width of the heat exchanger 21.
A cooling portion 32 is formed.

In FIG. 1, a sectional view of the expansion tube 29 will be shown and explained. That is, a plurality of heat pipes 27 and 28 are inserted and one end is placed inside the expansion tube 29, but the high temperature refrigerant heat flowing through the discharge pipe 24 is passed through the fins 33. The heating effect is increased by increasing heat transfer to the heat vibrator 27 and 28. In other words, the fins 33 fitted on the heat vibes 27 and 28
This causes the high-temperature refrigerant flowing through the discharge pipe 24 to flow turbulently so that it does not flow directly toward the outlet side 34. 35 is Wick.

When the above precautions are pressed and the heating operation is started, the heat exchanger 21 acts as an evaporator, and the refrigerant is constantly in an evaporated state. Depending on the conditions of this heating operation, the lower part of the heat exchanger 21 becomes close to freezing, or at least frosting, but this frosting and freezing is caused by the high temperature and high pressure refrigerant flowing from the discharge pipe 24 into the fins. 33, the medium in the heat pipes 27, 28 is evaporated and flows into the cooling section 32 of the heat exchanger 21 where it is heat exchanged and melts frost and ice. The cooled medium in the heat vibrators 27 and 28 is liquefied, guided to the wick 36, returned to the expansion tube 29, and heated again, resulting in a repeated flow, which reduces the adhesion generated in the heat exchanger 21, especially in the lower part. Eliminate frost and ice,
This allows stable heat bomb operation.

Effects of the Invention As is clear from the description of the embodiments described above, the present invention provides an expansion tube serving as a heat exchange section in the discharge tube, one end of the heat vibrator is connected to the expansion tube, and the other end is connected to the bottom of the heat exchanger. The high-temperature, high-pressure refrigerant heat from the discharge pipe is used to melt the frost and ice that forms on the heat exchanger through the heat pipe, thereby reducing the temperature at the bottom of the heat exchanger. The temperature is always maintained above zero, and even if there is a large amount of condensate due to melting by heat pipes or defrost operation (cooling operation) to melt frost and ice, it flows down to the frame that also serves as a drain pan, and drains smoothly through the holes. Ru. This has the advantage that the heat bomb can be operated stably without the accident of the fan contacting and destroying the fan due to the ice forming in large quantities as in the conventional case.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the heat exchange part of a heat exchanger antifreeze device according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the heat exchanger antifreeze device, and FIG. 3 is a conventional air conditioner. FIG. 2 is a partial perspective view of the outdoor unit of FIG. 21... Heat exchanger, 23... Compressor,
24...Discharge pipe, 25...Heat exchange section,
27. 28...Heat pipe, 29...
...Enlargement tube, 30.31...Insertion hole, 32...
...cooling part, 33...fin.

Claims (1)

[Claims] An expansion tube that forms a heat exchange section is provided in the discharge pipe of the compressor, and one end of a heat pipe with fins attached to this expansion tube is provided, and the other end is formed in the lower part of the heat exchanger on the outdoor side. A freezing prevention device for a heat exchanger, comprising: a cooling portion having a heat pipe inserted into an insertion hole, and configured to melt frost and ice on a lower portion of the heat exchanger using heat of a high temperature refrigerant from a discharge pipe.