JPS62288428A - Outdoor device of heat pump - Google Patents

Abstract

PURPOSE:To make uniform a frost layer distribution on the heat transfer surface of a finned heat exchanger to largely increase the operating time of the heat pump by providing the outdoor of the heat pump with a plurality of vent ports on the upper and lower surfaces of the finned heat pump part of a casing encircling the finned heat exchanger, a blower and the like thereby to form a three-side suction system. CONSTITUTION:A casing 8 encircles a finned heat exchanger 6, a blower 7 and the like to form a ventilation path, and a plurality of vent ports 9, 10 and 11 are provided on the upper and lower surfaces of the parts of the finned heat exchanger 6 of the casing 8. Further, in the finned heat exchanger 6 external air flowing in the directions of arrows 14, 15 and 16 between fins aligned in parallel at predetermined intervals is heat-exchanged with a coolant flowing within a heat transfer pipe perpendicularly inserted in to the fins 12. The finned heat exchanger 6 realizes a threeside suction system installed on the windside of the blower 7, and further the sizes of the vent ports 9, 10 and 11 are made larger successively from the windside to the leeward side. External air flows uniformly onto the heat transfer surface of the finned heat exchanger and the frost layer becomes uniform, and thus the operation time of the heat exchanger can be increased.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an outdoor unit of a heat pump using air as a heat source, such as a room air conditioner or a water heater.

Conventional technology Conventionally, the outdoor unit of an air heat source heat pump is
As shown in the figure, an outdoor heat exchanger 1. Blower 2. Compressor (
(not shown) are installed in the casing 3, and the outdoor heat exchanger 1 is installed on the windward side of the blower 2 to reduce noise, which is a so-called negative side intake type.

In the outdoor heat exchanger 1, the outside air flowing in the direction of arrow 4 between the fins arranged in parallel at regular intervals exchanges heat with the refrigerant flowing in the heat transfer tubes inserted perpendicularly to the fins.

Problems to be Solved by the Invention In such an outdoor unit, when heating operation is performed at a low outside temperature, the outdoor heat exchanger 1 functions as an evaporator, so water vapor in the outside air forms frost on the heat transfer surface. Attach and grow in the frost layer.

Since the amount of frost is proportional to the difference between the absolute humidity of the incoming air and the absolute humidity of the saturated humid air corresponding to the fin surface temperature, a large amount of frost adheres to the windward fins of the outdoor heat exchanger 1, and the leeward fins are exposed to a large amount of frost. There is almost no frost.

If the space between the fins is blocked by a layer of frost, the outdoor heat exchanger 1 will no longer be able to function as an evaporator, so defrosting operation will be required.

The conventional outdoor heat exchanger 1 uses a -plane intake system, and as mentioned above, the frost layer distribution on the outdoor heat exchanger 1 is extremely uneven, thicker on the windward side and thinner on the leeward side. When the upper fins are blocked by a layer of frost, defrosting operation must be started.
The drawback was that the heat pump operating time was very short.

Means for Solving the Problems The outdoor unit of the heat pump of the present invention is provided with a plurality of ventilation holes on the upper and lower surfaces of the finned heat exchanger portion of the casing surrounding the finned heat exchanger, the blower, etc. It has a three-sided intake system.

Function: With this configuration, the frost layer distribution on the heat transfer surface of the finned heat exchanger is uniform, and the operation time of the υ heat pump can be significantly extended.

Embodiment An embodiment of the present invention will be explained with reference to an overall view shown in FIG. 1 and a detailed view of a finned heat exchanger shown in FIG.

The outdoor unit 5 includes a finned heat exchanger 6. Blower7. It is composed of a compressor (not shown), a casing 8, etc., and the casing 8 has a finned heat exchanger 6. The blower 7 and the like are surrounded to form an air passage.

A plurality of ventilation holes 9, 10, 11 are provided on the upper and lower surfaces of the finned heat exchanger 6 portion of the casing 8.

In the finned heat exchanger 6, the outside air flows in the directions of arrows 14, 15, and 16 between the fins 12 arranged in parallel at regular intervals, and the refrigerant flows in the heat transfer tubes 13 inserted perpendicularly to the fins 12. and performs heat exchange.

Next, the heat exchanger 6 with fins is installed on the windward side of the blower 7, realizing a three-sided intake system.
The size of 10.11 increases in the order of 9 and 10.11 from the windward side to the leeward side of the airflow 14, that is, from the finned heat exchanger 6 to the blower 7.

The functions and effects of such a configuration will be described below. Outside air flows into the finned heat exchanger 6 from three sides. That is,
As shown by arrow 14, outside air flows in horizontally from a portion on the leeward side, as shown by arrow 15.

Moreover, the inflow amount of outside air indicated by the arrow 15 is the same as that of the ventilation holes 9 and 10.
No. 11 is larger on the leeward side, so the culm between the fins on the leeward side is longer.

Therefore, since fresh outside air flows almost uniformly into the heat transfer surface of the finned heat exchanger 6, the frost layer distribution becomes uniform, and the heat pump operating time until the fins become clogged with a frost layer is significantly reduced. can be extended to

Moreover, the ventilation holes 9, 10.11 on the lower surface also have the effect of quickly discharging the drain water that has melted during defrosting to the outside of the unit.

Effects of the Invention In the outdoor unit of the heat pump of the present invention, a plurality of ventilation holes are provided on the upper and lower surfaces of the finned heat exchanger portion of the casing surrounding the finned heat exchanger, the blower, etc., and the front surface is aligned with the finned heat exchanger portion. Since it is a three-sided intake system, a frost layer can be uniformly formed over the entire heat transfer surface of the finned heat exchanger, and the heat pump operating time can be significantly extended.

[Brief explanation of drawings]

FIG. 1 is a schematic view of an outdoor unit according to an embodiment of the present invention, FIG. 2 is a detailed view of essential parts of the same unit, and FIG. 3 is a schematic view of a conventional outdoor unit. 6...- Outdoor unit, 6... Heat exchanger with fins, 7... Blower, 8... Casing, 9, 10, 11...・Ventilation. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2: Six with fins and Saioyu

Claims (2)

[Claims] (1) Heat pump components such as a finned heat exchanger and a blower are surrounded by a casing, and multiple ventilation holes are provided on the front, top, and bottom surfaces of the casing relative to the finned heat exchanger, creating a three-sided intake system. Heat pump outdoor unit. (2) The outdoor unit of the heat pump according to claim 1, wherein the size of the ventilation opening is increased in order from the windward side to the leeward side.