JPWO2020136825A1 - Heat pump device - Google Patents

Abstract

The heat pump device is a compressor that compresses the refrigerant, a liquid heat exchanger that exchanges heat between the refrigerant and a liquid heat medium, a box that houses the liquid heat exchanger, and heat between the refrigerant and air. It is provided with an air heat exchanger for exchanging the air heat exchanger and a fan rotor for generating an air flow passing through the air heat exchanger. The air heat exchanger has a rear surface portion located on the rear surface. The fan rotor is located in front of the rear surface of the air heat exchanger. The box has a front surface, a rear surface, and an upper surface connecting between the front upper end, which is the upper end of the front surface, and the rear upper end, which is the upper end of the rear surface. The rear upper end is higher than the front upper end. The upper surface of the box is divided into a front upper surface and a rear upper surface behind the front upper surface. The front upper surface is lower than the rear upper surface. At least a portion of the fan rotor is located above the top surface of the front position.

Description

The present invention relates to a heat pump device.

Patent Document 1 below discloses an outdoor unit applied to a heat pump type hot water supply system. This outdoor unit is arranged between the compressor arranged inside the housing, the blower fan connected to the fan motor, the fan motor mounting base for mounting the fan motor, and the compressor and the blower fan inside the housing. It is equipped with a partition plate.

Japanese Patent Application Laid-Open No. 2010-014368

In the technique of Patent Document 1, if the box for accommodating the water heat exchanger that exchanges heat between water and the refrigerant is enlarged, it comes into contact with the bell mouth provided on the front panel. Therefore, in order to mount a large water heat exchanger, it is necessary to move the position of the bell mouth upward. As a result, the heat exchange efficiency of the air heat exchanger is lowered.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a heat pump device which is advantageous in improving the heat exchange efficiency of an air heat exchanger.

The heat pump device of the present invention includes a compressor that compresses a refrigerant, a liquid heat exchanger that exchanges heat between the refrigerant and a liquid heat medium, a box that houses the liquid heat exchanger, and a refrigerant and air. In a heat pump device comprising an air heat exchanger that exchanges heat between them and a fan rotor that generates an air flow that passes through the air heat exchanger, the air heat exchanger has a rear surface portion located on the rear surface and is a fan. The rotor is located in front of the rear surface of the air heat exchanger, and the box has a front surface, a rear surface, and an upper surface connecting between the front upper end, which is the upper end of the front surface, and the rear upper end, which is the upper end of the rear surface. However, the rear upper end is higher than the front upper end, the upper surface of the box is divided into a front upper surface and a rear upper surface behind the front upper surface, and the front upper surface is lower than the rear upper surface. It is in position and at least part of the fan rotor is located above the upper surface of the anterior position.

According to the present invention, it is possible to provide a heat pump device that is advantageous in improving the heat exchange efficiency of an air heat exchanger.

It is a front view which shows the heat pump apparatus by Embodiment 1. FIG. It is a front view which shows the heat pump apparatus by Embodiment 1. FIG. It is a side sectional view which shows the heat pump apparatus by Embodiment 1. FIG. It is a top view which shows the liquid heat exchanger provided in the heat pump apparatus according to Embodiment 1. FIG.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate description.

Embodiment 1.
1 and 2 are front views showing a heat pump device according to the first embodiment. FIG. 3 is a side sectional view showing the heat pump device according to the first embodiment. FIG. 3 corresponds to a cross-sectional view cut along the line AA in FIG.

As shown in these figures, the heat pump device 100 according to the first embodiment includes a compressor 1, an air heat exchanger 2, a box 3, a fan rotor 4, a bottom plate 5, a liquid heat exchanger 7, and a fan motor 9. .. The heat pump device 100 is installed outdoors. In the following description, the direction is specified with reference to the state in which the heat pump device 100 is installed on a horizontal plane. In the present embodiment, the vertical direction and the horizontal direction are defined as indicated by the arrows in FIGS. 1 and 2. Further, as shown by the arrows in FIG. 3, the vertical direction and the front-back direction are defined. The vertical direction corresponds to the vertical direction. Further, the vertical direction corresponds to the height direction.

As shown in FIG. 1, the bottom plate 5 forms the bottom portion of the heat pump device 100. The bottom plate 5 is typically made of metal.

The compressor 1 compresses the refrigerant gas. In this embodiment, it is desirable to use carbon dioxide as a refrigerant. However, a refrigerant other than carbon dioxide may be used. The compressor 1, the liquid heat exchanger 7, the decompression device for reducing the pressure of the refrigerant (not shown), and the air heat exchanger 2 are connected in an annular shape by a refrigerant pipe to form a refrigerant circuit. When the compressor 1 is operated, the refrigerant in the refrigerant circuit circulates.

The liquid heat exchanger 7 exchanges heat between the refrigerant and the liquid heat medium. The liquid heat medium in this embodiment may be, for example, water. Further, the liquid heat medium in the present embodiment may be a liquid other than water such as an aqueous solution of calcium chloride, an aqueous solution of ethylene glycol, and alcohol. The heat medium can be heated by exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor 1 and the heat medium by the liquid heat exchanger 7. The heated heat medium is supplied to the outside of the heat pump device 100. The supplied heat medium may be used for hot water supply or heating, for example.

As shown in FIG. 3, the liquid heat exchanger 7 is housed in the box 3. Box 3 is typically made of metal. A heat insulating material 10 that covers the liquid heat exchanger 7 is provided in the box 3.

The decompression device decompresses and expands the high-pressure refrigerant that has passed through the liquid heat exchanger 7. The decompressor reduces the temperature and pressure of the refrigerant. The pressure reducing device may be an expansion valve whose opening degree can be adjusted.

The low-pressure refrigerant that has passed through the decompression device flows into the air heat exchanger 2. The air heat exchanger 2 exchanges heat between the refrigerant and air. In the air heat exchanger 2, the refrigerant absorbs the heat of air.

The air heat exchanger 2 has a rear surface portion 2A located on the rear surface of the heat pump device 100. The rear surface portion 2A has an outer shape extending perpendicular to the horizontal plane. Further, the rear surface portion 2A has an outer shape extending along a plane perpendicular to the front-rear direction.

The air heat exchanger 2 in the present embodiment further has a left side surface portion 2B located on the left side surface of the heat pump device 100. The left side surface portion 2B has an outer shape extending perpendicular to the horizontal plane. Further, the left side surface portion 2B has an outer shape extending along a plane perpendicular to the left-right direction. In a plan view, the rear surface portion 2A and the left surface portion 2B are connected in an L shape.

As shown in FIG. 3, the fan rotor 4 is located in front of the rear surface portion 2A of the air heat exchanger 2. The fan motor 9 rotates the fan rotor 4. When the fan rotor 4 rotates, an air flow passing through the air heat exchanger 2 is generated. The fan rotor 4 in the illustrated example corresponds to a propeller fan having three blades.

As shown in FIG. 2, a front panel 6 is attached to the front surface of the heat pump device 100. A bell mouth 8 is attached to the front panel 6. The bell mouth 8 is provided so as to surround the fan rotor 4. That is, the bell mouth 8 is around the fan rotor 4. The area on the front surface of the heat pump device 100 except the inside of the bell mouth 8 is covered by the front panel 6. FIG. 1 shows a state in which the front panel 6 and the bell mouth 8 are removed.

The internal space of the heat pump device 100 is divided into a blower chamber 14 on the left side and a machine room 15 on the right side by a partition plate 16. The fan rotor 4, the liquid heat exchanger 7, and the box 3 are installed in the blower chamber 14. The compressor 1 is installed in the machine room 15. The compressor 1, the air heat exchanger 2, the liquid heat exchanger 7, and the box 3 are arranged on the bottom plate 5.

When the fan rotor 4 rotates, the outside air passes through the air heat exchanger 2 and is sucked into the blower chamber 14. The sucked air passes through the inside of the bell mouth 8 and is discharged to the outside of the heat pump device 100. In the present embodiment, by providing the bell mouth 8, the air passing through the air blowing chamber 14 can flow more smoothly. The direction of the airflow passing through the blower chamber 14 may be opposite to the above. That is, the airflow may flow so as to pass through the inside of the bell mouth 8 and be sucked into the blower chamber 14, then pass through the air heat exchanger 2 and be discharged to the outside of the heat pump device 100.

As shown in FIG. 3, the fan rotor 4 is located in front of the fan motor 9. The fan rotor 4 faces the rear surface portion 2A of the air heat exchanger 2. The fan rotor 4 is connected to the output shaft of the fan motor 9. The line of the rotation center RC of the fan rotor 4 is parallel to the front-rear direction. That is, the line of the rotation center RC is horizontal. The fan motor 9 is supported by a support column 11. FIG. 3 corresponds to a view cut by a plane including the line of the rotation center RC.

The box 3 has a front surface 3A and a rear surface 3B. The front surface 3A is a surface facing forward. The rear surface 3B is a surface facing backward. In the illustrated example, the front surface 3A and the rear surface 3B are perpendicular to the horizontal plane. A space 12 is formed between the rear surface 3B and the rear surface portion 2A of the air heat exchanger 2.

The front upper end 3C corresponds to the upper end of the front surface 3A. The rear upper end 3D corresponds to the upper end of the rear surface 3B. The rear upper end 3D is located higher than the front upper end 3C.

The upper surface of the box 3 is a surface that connects the front upper end 3C and the rear upper end 3D. The upper surface is divided into a front upper surface 3E and a rear upper surface 3F with a boundary 3G as a boundary. The rear upper surface 3F is behind the front upper surface 3E. The front upper surface 3E is a surface connecting from the front upper end 3C to the boundary 3G. The rear upper surface 3F is a surface connecting from the boundary 3G to the rear upper end 3D.

The front upper surface 3E is located lower than the rear upper surface 3F. At least a part of the fan rotor 4 is located above the front upper surface 3E. That is, at least a part of the fan rotor 4 is located vertically above the front upper surface 3E. In the illustrated example, the lower end 4A of the fan rotor 4 is located vertically above the front upper surface 3E.

The larger the radius of the fan rotor 4, the larger the air volume, which is advantageous in improving the heat exchange efficiency of the air heat exchanger 2. In general, if the radius of the fan rotor 4 is increased, a trade-off relationship arises in which the liquid heat exchanger 7 has to be miniaturized. The reason is as follows. In order to install the fan rotor 4 having a large radius, it is necessary to increase the distance between the rotation center RC and the upper surface of the box 3. Therefore, if the positions of the rotation center RCs are the same, it is necessary to lower the position of the upper surface of the box 3. When the position of the upper surface of the box 3 is lowered, the volume of the box 3 is reduced, so that the liquid heat exchanger 7 has to be miniaturized.

In contrast, in the present embodiment, the following effects can be obtained. The distance between the rotation center RC and the front upper surface 3E is larger than the distance between the rotation center RC and the rear upper surface 3F. As a result, it is easy to install the fan rotor 4 having a large radius, which is advantageous in improving the heat exchange efficiency of the air heat exchanger 2. Further, since the rear upper surface 3F is located higher than the front upper surface 3E, it is possible to prevent a decrease in the volume of the box 3. Therefore, it is easy to install the liquid heat exchanger 7 having a relatively large size.

In the following description, the dimension of the internal space of the box 3 in the vertical direction is referred to as "internal space height". In the present embodiment, the height of the internal space under the rear upper surface 3F is larger than the height of the internal space under the front upper surface 3E. This is more advantageous in increasing the volume of the box 3, so that it is easy to install a liquid heat exchanger 7 having a larger size.

In the present embodiment, the front upper surface 3E is inclined so that the position is continuously lowered from the back to the front. That is, the front upper surface 3E is inclined so as to descend from the boundary 3G toward the front upper end 3C. This is more advantageous in achieving both lowering the position of the front upper surface 3E near the front upper end 3C and increasing the volume of the box 3.

In the present embodiment, the rear upper surface 3F is horizontal. The boundary 3G is at the same height as the rear upper end 3D. The lower end of the support column 11 is fixed to the rear upper surface 3F. In the present embodiment, the horizontal upper surface 3F of the rear position is more advantageous in increasing the volume of the box 3.

The air heat exchanger height H1 in FIG. 3 is the vertical distance between the lower end of the air heat exchanger 2 and the upper end of the air heat exchanger 2. Further, the rotation center height H2 is a vertical distance between the lower end of the air heat exchanger 2 and the rotation center RC of the fan rotor 4. In the present embodiment, the rotation center height H2 is equal to 1/2 of the air heat exchanger height H1. That is, with respect to the position in the vertical direction, the rotation center RC of the fan rotor 4 is located at the center of the height of the air heat exchanger 2. This is advantageous in evenly applying the airflow to the entire air heat exchanger 2, so that the heat exchange efficiency of the air heat exchanger 2 can be further improved. As a result, the operation of the heat pump cycle can be performed more efficiently. If the height of the center of rotation H2 is 0.45 times or more the height of the air heat exchanger H1 and 0.54 times or less of the height H1 of the air heat exchanger, an effect similar to the above effect is obtained. Is obtained.

In the present embodiment, the line of the rotation center RC of the fan rotor 4 is horizontal. As a modification, the line of the rotation center RC of the fan rotor 4 may be inclined with respect to the horizontal plane. When the line of the rotation center RC is inclined with respect to the horizontal plane, the vertical distance between the lower end of the air heat exchanger 2 and the position of the center of gravity of the fan rotor 4 corresponds to the rotation center height H2. And.

At least a portion of the bell mouth 8 is located above the front upper surface 3E of the box 3. That is, at least a part of the bell mouth 8 is located vertically above the front upper surface 3E. In the present embodiment, since the front upper surface 3E is lower than the rear upper surface 3F, the position of the bell mouth 8 can be lowered. Therefore, it is advantageous to bring the position of the rotation center RC of the fan rotor 4 closer to the position of the center of the air heat exchanger height H1.

Assuming that the front upper surface 3E is at the same height as the rear upper surface 3F, it is necessary to raise the positions of the fan rotor 4 and the bell mouth 8. As a result, the position of the rotation center RC of the fan rotor 4 deviates significantly above the center position of the air heat exchanger height H1. Therefore, it may be difficult to improve the heat exchange efficiency of the air heat exchanger 2.

The bell mouth 8 in this embodiment has a first lower end 8A and a second lower end 8B. The first lower end 8A is located before the second lower end 8B. The first lower end 8A is lower than the second lower end 8B. The second lower end 8B is located vertically above the front upper surface 3E. The first lower end 8A is in front of the front surface 3A of the box 3 with respect to the position in the front-rear direction. The bell mouth 8 is not in contact with the box 3.

In the present embodiment, the first lower end 8A of the bell mouth 8 is located lower than the rear upper end 3D of the box 3. This is more advantageous in lowering the position of the bell mouth 8. As a result, it becomes more advantageous to bring the position of the rotation center RC of the fan rotor 4 closer to the position of the center of the air heat exchanger height H1. In the illustrated example, the first lower end 8A of the bell mouth 8 is located lower than the rear upper surface 3F of the box 3. Further, the first lower end 8A is at a position substantially the same height as the front upper end 3C of the box 3.

Further, in the present embodiment, the second lower end 8B of the bell mouth 8 is located at a position lower than the rear upper end 3D of the box 3. This is more advantageous in lowering the position of the bell mouth 8. As a result, it becomes more advantageous to bring the position of the rotation center RC of the fan rotor 4 closer to the position of the center of the air heat exchanger height H1. In the illustrated example, the second lower end 8B of the bell mouth 8 is located lower than the rear upper surface 3F of the box 3.

This embodiment is advantageous in increasing the size of the fan rotor 4 and the bell mouth 8. As a result, the amount of heat exchanged by the air heat exchanger 2 can be increased, and high-performance operation becomes possible.

FIG. 4 is a plan view showing a liquid heat exchanger 7 included in the heat pump device 100 according to the first embodiment. The liquid heat exchanger 7 in the present embodiment has a composite pipe structure 7C in which a refrigerant pipe through which a refrigerant passes is wound in a spiral shape around a liquid pipe through which a heat medium passes. The liquid heat exchanger 7 includes an upper portion 7A in which the composite pipe structure 7C is wound in a coil shape, and a lower stage portion 7B in which the composite pipe structure 7C is wound in a coil shape. The upper portion 7A is located above the lower portion 7B. In a plan view, the upper portion 7A has a length L1 in the front-rear direction and a length L2 in the left-right direction. The lower portion 7B has a length L3 in the front-rear direction and a length L4 in the left-right direction. In the illustrated example, L1 <L3 and L2 <L4. In a plan view, the area of the region surrounded by the outer edge of the upper portion 7A is smaller than the area of the region surrounded by the outer edge of the lower portion 7B.

As shown in FIG. 3, when the internal space of the box 3 is divided into the lower space 3H and the upper space 3I, the cross-sectional area of the upper space 3I cut in the horizontal plane is larger than the cross-sectional area of the lower space 3H cut in the horizontal plane. It becomes smaller. The horizontal cross-sectional area of the upper space 3I is smaller than the horizontal cross-sectional area of the lower space 3H due to the formation of the inclined front upper surface 3E. The entire lower portion 7B of the liquid heat exchanger 7 is located in the lower space 3H. At least a part of the upper portion 7A is located in the upper space 3I. In the present embodiment, the liquid heat exchanger 7 is provided with the upper portion 7A having an area smaller than that of the lower portion 7B in a plan view, so that the following effects can be obtained. Not only the lower space 3H but also the upper space 3I having a relatively small horizontal cross-sectional area can be effectively utilized to arrange the upper portion 7A of the liquid heat exchanger 7. Therefore, it is advantageous to store the large liquid heat exchanger 7 in the box 3.

In the present embodiment, the front upper surface 3E is longer than the rear upper surface 3F in terms of length in the front-rear direction. That is, with respect to the position in the front-rear direction, the boundary 3G is located behind the center of the box 3.

As a modification, the rear upper surface 3F may be inclined so that the position is continuously lowered from the back to the front. For example, the rear upper surface 3F may be inclined at the same inclination angle as the front upper surface 3E. In that case, the central position of the box 3 with respect to the position in the front-rear direction may be regarded as the boundary 3G between the front upper surface 3E and the rear upper surface 3F.

As another modification, at least a part of the front upper surface 3E may be horizontal. For example, the front upper surface 3E may be horizontal at a position lower than the rear upper surface 3F, and a step may be formed at the position of the boundary 3G.

In the present embodiment, the maximum length of the box 3 in the front-rear direction is larger than the maximum length of the box 3 in the vertical direction. Further, the maximum length of the box 3 in the left-right direction is larger than the maximum length of the box 3 in the front-rear direction.

As shown in FIG. 1, in the present embodiment, the outer shape of the box 3 has a substantially constant shape along the left-right direction. As a modification, the outer shape of the box 3 may change along the left-right direction.

1 Compressor, 2 Air heat exchanger, 2A rear surface, 2B left side surface, 3 boxes, 3A front surface, 3B rear surface, 3C front upper end, 3D rear upper end, 3E front upper surface, 3F rear upper surface, 3G boundary, 4 fans Rotor, 4A lower end, 5 bottom plate, 6 front panel, 7 liquid heat exchanger, 7A upper part, 7B lower part, 7C composite tube structure, 8 bell mouth, 8A first lower end, 8B second lower end, 9 fan motor, 10 Insulation material, 11 columns, 12 spaces, 14 air blower room, 15 machine room, 16 partition plate, 100 heat pump device

The heat pump device of the present invention includes a compressor that compresses a refrigerant, a liquid heat exchanger that exchanges heat between the refrigerant and a liquid heat medium, a box that houses the liquid heat exchanger, and a refrigerant and air. In a heat pump device comprising an air heat exchanger that exchanges heat between them and a fan rotor that generates airflow through the air heat exchanger, the air heat exchanger has a rear surface portion located on the rear surface and is a fan. The rotor is located in front of the rear surface of the air heat exchanger, and the box has a front surface and an upper surface connecting the rear surface and between the front upper end, which is the upper end of the front surface, and the rear upper end, which is the upper end of the rear surface. However, the rear upper end is higher than the front upper end, the upper surface of the box is divided into a front upper surface and a rear upper surface behind the front upper surface, and the front upper surface is lower than the rear upper surface. In position, at least part of the fan rotor is located above the front upper surface, and the vertical distance between the lower end of the air heat exchanger and the upper end of the air heat exchanger is the air heat exchanger height. The vertical distance between the lower end of the air heat exchanger and the center of rotation of the fan rotor is the height of the center of rotation, and the height of the center of rotation is 0.45 times or more the height of the air heat exchanger. Moreover, it is 0.54 times or less the height of the air heat exchanger .

Claims (8)

A compressor that compresses the refrigerant and
A liquid heat exchanger that exchanges heat between the refrigerant and a liquid heat medium,
A box for storing the liquid heat exchanger and
An air heat exchanger that exchanges heat between the refrigerant and air,
A fan rotor that generates an air flow that passes through the air heat exchanger,
In a heat pump device equipped with
The air heat exchanger has a rear surface portion located on the rear surface and has a rear surface portion.
The fan rotor is located in front of the rear surface portion of the air heat exchanger.
The box has a front surface, a rear surface, and an upper surface connecting between the front upper end, which is the upper end of the front surface, and the rear upper end, which is the upper end of the rear surface.
The rear upper end is located higher than the front upper end.
The upper surface of the box is divided into a front upper surface and a rear upper surface behind the front upper surface.
The front upper surface is located lower than the rear upper surface.
At least a part of the fan rotor is a heat pump device located on the front upper surface. The heat pump device according to claim 1, wherein the front upper surface is inclined so that the position is continuously lowered from the back to the front. The vertical distance between the lower end of the air heat exchanger and the upper end of the air heat exchanger is the air heat exchanger height.
The vertical distance between the lower end of the air heat exchanger and the rotation center of the fan rotor is the height of the rotation center.
The heat pump device according to claim 1 or 2, wherein the height of the center of rotation is 0.45 times or more the height of the air heat exchanger and 0.54 times or less the height of the air heat exchanger. .. The liquid heat exchanger has a coiled lower portion and a coiled upper portion located above the lower portion.
The heat pump device according to any one of claims 1 to 3, wherein in a plan view, the area of the region surrounded by the outer edge of the upper portion is smaller than the area of the region surrounded by the outer edge of the lower portion. With a bell mouth around the fan rotor
The heat pump device according to any one of claims 1 to 4, wherein at least a part of the bell mouth is located on the upper surface of the front position. The heat pump device according to claim 5, wherein the lower end of the bell mouth is located lower than the rear upper end of the box. The vertical dimension of the internal space of the box is the height of the internal space.
The heat pump device according to any one of claims 1 to 6, wherein the height of the internal space under the upper surface of the rear position is larger than the height of the internal space under the upper surface of the front position. The heat pump device according to any one of claims 1 to 7, wherein the rear upper surface is horizontal.

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