JP5845925B2 - Heat pump outdoor unit - Google Patents

Description

  The present invention relates to a heat pump outdoor unit.

  2. Description of the Related Art A heat pump type hot water heater excellent in energy efficiency that can boil hot water by absorbing the heat of air is widely used. The heat pump outdoor unit provided in the heat pump water heater is equipped with an air heat exchanger that absorbs the heat of the air into the refrigerant, a blower that blows air to the air heat exchanger, a water heat exchanger that heats the water using the heat of the refrigerant, etc. Is done. As a general configuration, an air heat exchanger is installed at the back of the heat pump outdoor unit, a blower is arranged in front of the air heat exchanger, and a water refrigerant is placed in the lower part of the air passage through which the air blown by the blower passes. A heat exchanger is arranged. The water heat exchanger is housed in a case made of a foam material and is further covered with a metal water heat exchanger cover.

  In Patent Document 1, in order to prevent rainwater from staying on the water heat exchanger cover (gas cooler cover), the upper surface of the water heat exchanger cover is inclined so as to become higher as the air heat exchanger is approached. A heat pump outdoor unit provided with the inclined surface is disclosed.

JP 2011-158202 A

  In a conventional heat pump outdoor unit, since the water refrigerant heat exchanger is arranged in the lower part of the air passage through which the air blown by the blower passes, the lower part of the air heat exchanger is equal to the height of the water heat exchanger cover. There is a problem that the air flow path is obstructed and the heat exchange performance at the lower part of the air heat exchanger deteriorates. In particular, in the heat pump outdoor unit disclosed in Patent Document 1, the upper surface of the water heat exchanger cover is inclined so as to increase as it approaches the air heat exchanger, and the water heat exchange in a portion close to the air heat exchanger is performed. Since the height of the heat exchanger cover is high, the area where the airflow that has passed through the lower portion of the air heat exchanger collides with the water heat exchanger cover is large, and the air blowing path at the lower portion of the air heat exchanger is likely to be hindered.

  The present invention has been made to solve the above-described problems, and a first object is to improve the heat exchange performance of an air heat exchanger that performs heat exchange between air and refrigerant in a heat pump outdoor unit. There is. A second object is to prevent rainwater from staying on the liquid heat exchanger cover that covers the liquid heat exchanger that performs heat exchange between the refrigerant and the liquid heat medium.

The heat pump outdoor unit according to the present invention is disposed at a lower portion in an air passage through which an air heat exchanger that performs heat exchange between a refrigerant and air, a blower that blows air to the air heat exchanger, and a wind that is blown by the blower pass. A liquid heat exchanger that performs heat exchange between the refrigerant and the liquid heat medium, and a liquid heat exchanger cover that covers the liquid heat exchanger, and the air heat exchanger is provided on the air inflow side to the air passage. An inclined surface is formed on the upper surface of the liquid heat exchanger cover so as to become lower as it approaches the air heat exchanger. The liquid heat exchanger includes the first heat exchanger and the air heat. The second heat exchanger is disposed between the exchanger and the first heat exchanger, and the height of the second heat exchanger is lower than the height of the first heat exchanger. It is what.
Further, the heat pump outdoor unit according to the present invention includes an air heat exchanger that performs heat exchange between the refrigerant and air, a blower that blows air to the air heat exchanger, and a lower portion in the air passage through which the air blown by the blower passes. A liquid heat exchanger that is arranged to exchange heat between the refrigerant and the liquid heat medium, and a liquid heat exchanger cover that covers the liquid heat exchanger, and the air heat exchanger has an inflow of wind into the air passage An inclined surface is formed on the upper surface of the liquid heat exchanger cover so as to become lower toward the air heat exchanger, and the inclined surface becomes closer to the air heat exchanger. The angle increases stepwise or continuously.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the heat exchange performance of the air heat exchanger which performs heat exchange with air and a refrigerant | coolant in a heat pump outdoor unit. Moreover, it becomes possible to prevent rainwater from staying on the liquid heat exchanger cover that covers the liquid heat exchanger that performs heat exchange between the refrigerant and the liquid heat medium.

It is sectional drawing which looked at the heat pump outdoor unit of Embodiment 1 of this invention from the side. It is sectional drawing which looked at the heat pump outdoor unit of Embodiment 1 of this invention from the side. It is sectional drawing which looked at the heat pump outdoor unit of Embodiment 2 of this invention from the side.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
1 and 2 are cross-sectional views of the heat pump outdoor unit according to Embodiment 1 of the present invention as viewed from the side. The left side in the figure is the front (front side), and the right side in the figure is the back (back side). The heat pump outdoor unit 1 shown in these drawings includes a base 2 that functions as a base, an air heat exchanger 3, a compressor (not shown), a water heat exchanger 5, and an expansion valve (not shown). Water passing through a refrigerant pipe connected to the air, a blower fan 4 and a fan motor 15 constituting a blower for blowing air to the air heat exchanger 3, and water passing through a water heat exchanger 5 (liquid heat exchanger) Circuit. During the operation of the heat pump outdoor unit 1, the high-temperature and high-pressure refrigerant compressed by the compressor heats the water in the water circuit in the water heat exchanger 5. Thereby, water is boiled to hot water. The low-temperature and medium-pressure refrigerant exiting the water heat exchanger 5 passes through the expansion valve and becomes a low-temperature and low-pressure refrigerant. This low-temperature and low-pressure refrigerant absorbs the heat of the air in the air heat exchanger 3 and evaporates, and returns to the compressor again.

  The front surface of the heat pump outdoor unit is covered with a front panel 11. The front panel 11 is provided with a grill 12 through which air (airflow) blown by the blower fan 4 can pass. The air heat exchanger 3 is disposed on the back surface of the heat pump outdoor unit 1. In the space (wind path) between the front panel 11 (grill 12) and the air heat exchanger 3, a blower fan 4 and a fan motor 15 that rotationally drives the fan 4 are installed. The fan motor 15 is supported by a motor support 13. When the blower fan 4 rotates, air is blown from the back side of the heat pump outdoor unit 1 toward the front side. That is, air passes from the back surface of the heat pump outdoor unit 1 through the air heat exchanger 3, flows into the air passage in the heat pump outdoor unit 1, passes through the grill 12, and is discharged to the front side of the heat pump outdoor unit 1.

  The water heat exchanger 5 is disposed in the lower part of the air path in the heat pump outdoor unit 1. The water heat exchanger 5 is housed in a foam case 6 made of a foam material such as expanded polystyrene having heat insulation, and the foam case 6 is made of a water heat exchanger cover 7 (liquid heat) made of metal or the like. It is further covered by an exchanger cover). The blower fan 4 and the fan motor 15 are disposed above the water heat exchanger cover 7. An inclined surface 71 is formed on the upper surface of the water heat exchanger cover 7 so as to become lower as the air heat exchanger 3 is approached. A space is provided between the back surface portion 72 of the water heat exchanger cover 7 and the air heat exchanger 3. The back surface portion 72 of the water heat exchanger cover 7 faces the lower portion of the air heat exchanger 3. The angle formed between the inclined surface 71 and the back surface portion 72 is an obtuse angle larger than 90 °.

  The broken-line arrows in FIG. 1 indicate the flow of air that passes through the lower part of the air heat exchanger 3 when the blower fan 4 rotates. The airflow that has passed through the lower portion of the air heat exchanger 3 collides with the back surface portion 72 of the water heat exchanger cover 7, moves upward, and flows forward along the inclined surface 71. In the present embodiment, since the inclined surface 71 is formed on the upper surface of the water heat exchanger cover 7, the height dimension A of the back surface portion 72 is reduced, so that the resistance of the airflow that has passed through the lower portion of the air heat exchanger 3 is reduced. Thus, the area of the back portion 72 can be reduced. Further, the airflow can flow smoothly along the inclined surface 71. For this reason, the air flow path of the airflow passing through the lower part of the air heat exchanger 3 is improved, and the air path resistance is reduced. As a result, a decrease in heat exchange performance at the lower part of the air heat exchanger 3 can be suppressed, and the heat exchange performance of the air heat exchanger 3 can be improved.

  The broken-line arrows in FIG. 2 indicate the drainage path of rainwater that has entered the air path of the heat pump outdoor unit 1. Rainwater that has entered from the grill 12 of the front panel 11 falls on the inclined surface 71 of the water heat exchanger cover 7, flows down the inclined surface 71, and the rear portion 72 of the water heat exchanger cover 7 and the air heat exchanger 3. Gather between the bottom. The rainwater collected in this way is drained to the outside from a drainage port 8 provided in the base 2. Thus, in this embodiment, by providing the inclined surface 71, it is possible to reliably prevent rainwater from staying on the upper surface of the water heat exchanger cover 7. Moreover, rainwater does not stay in the heat pump outdoor unit 1, and rainwater can be reliably discharged to the outside from the drain port 8.

  In the present embodiment, the heat pump outdoor unit 1 for hot water supply in which the refrigerant heats water in the water heat exchanger 5 to generate hot water has been described as an example. However, the present invention describes a liquid heat medium other than water ( For example, the present invention can be applied to a heat pump outdoor unit for heating or the like in which a refrigerant heats a brine, an antifreeze liquid, or the like) with a liquid heat exchanger.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 3. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 3 is a cross-sectional view of the heat pump outdoor unit according to Embodiment 2 of the present invention as viewed from the side.

  As shown in FIG. 3, the water heat exchanger 5 included in the heat pump outdoor unit 1 according to the second embodiment is separated into a first heat exchanger 9 and a second heat exchanger 10. Yes. The first heat exchanger 9 is disposed on the side close to the front panel 11, and the second heat exchanger 10 is disposed on the side close to the air heat exchanger 3. That is, the second heat exchanger 10 is disposed between the air heat exchanger 3 and the first heat exchanger 9. The height of the second heat exchanger 10 is lower than the height of the first heat exchanger 9. Thus, in the water heat exchanger 5 of the present embodiment, the height of the portion close to the air heat exchanger 3 (second heat exchanger 10) is a portion far from the air heat exchanger 3 (first heat). It is lower than the height of the exchanger 9). The second heat exchanger 10 may have a smaller capacity than the first heat exchanger 9.

  On the upper surface of the water heat exchanger cover 7, inclined surfaces 73 and 74 are formed so as to become lower as the air heat exchanger 3 is approached. In the second embodiment, the water heat exchanger 5 is inclined such that the height of the portion close to the air heat exchanger 3 is lower than the height of the portion far from the air heat exchanger 3. The inclination angles of the surfaces 73 and 74 can be made larger than those in the first embodiment. For this reason, since the height dimension A of the back surface portion 72 of the water heat exchanger cover 7 can be further reduced, the air flow path of the airflow passing through the lower portion of the air heat exchanger 3 is further improved and the air path resistance is reduced. Smaller. As a result, the lowering of the heat exchange performance at the lower part of the air heat exchanger 3 can be more reliably suppressed, and the heat exchange performance of the air heat exchanger 3 can be further improved.

  In the second embodiment, the inclination angle of the inclined surface 74 located closer to the air heat exchanger 3 is larger than the inclination angle of the inclined surface 73 located away from the air heat exchanger 3. . Thus, it is preferable that the inclination angle formed on the upper surface of the water heat exchanger cover 7 increases stepwise or continuously as the inclination becomes closer to the air heat exchanger 3. Thereby, since the airflow which passed the lower part of the air heat exchanger 3 flows more smoothly along the inclined surface 71, the heat exchange performance of the air heat exchanger 3 can further be improved.

1 Heat Pump Outdoor Unit 2 Base 3 Air Heat Exchanger 4 Blower Fan 5 Water Heat Exchanger 6 Foaming Case 7 Water Heat Exchanger Cover 8 Drainage Port 9 First Heat Exchanger 10 Second Heat Exchanger 11 Front Panel 12 Grill 13 Motor support 15 Fan motor 71, 73, 74 Inclined surface 72 Rear surface

Claims (4)

An air heat exchanger for exchanging heat between the refrigerant and air;
A blower for blowing air to the air heat exchanger;
A liquid heat exchanger that is disposed in a lower portion in an air passage through which air blown by the blower passes, and performs heat exchange between the refrigerant and the liquid heat medium;
A liquid heat exchanger cover covering the liquid heat exchanger;
With
The air heat exchanger is located on the air inflow side to the air passage, and an inclined surface is formed on the upper surface of the liquid heat exchanger cover so as to become lower as the air heat exchanger is approached. and,
The liquid heat exchanger is separated into a first heat exchanger and a second heat exchanger disposed between the air heat exchanger and the first heat exchanger, The heat pump outdoor unit in which the height of the heat exchanger 2 is lower than the height of the first heat exchanger . An air heat exchanger for exchanging heat between the refrigerant and air;
A blower for blowing air to the air heat exchanger;
A liquid heat exchanger that is disposed in a lower portion in an air passage through which air blown by the blower passes, and performs heat exchange between the refrigerant and the liquid heat medium;
A liquid heat exchanger cover covering the liquid heat exchanger;
With
The air heat exchanger is located on the air inflow side to the air passage, and an inclined surface is formed on the upper surface of the liquid heat exchanger cover so as to become lower as the air heat exchanger is approached. and,
The inclined surface is closer to the air heat exchanger, the inclination angle stepwise or continuously increased Na Ru heat pump outdoor unit. 3. The heat pump outdoor unit according to claim 2, wherein the liquid heat exchanger has a height of a portion near the air heat exchanger that is lower than a height of a portion far from the air heat exchanger.   The heat pump outdoor unit according to any one of claims 1 to 3, further comprising a drain outlet for draining rainwater collected between the liquid heat exchanger cover and the air heat exchanger by flowing down the inclined surface.

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