JP2945914B2 - Outdoor unit of engine driven heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit of an engine-driven heat pump, and more particularly to an outdoor unit of an engine-driven heat pump that has a plurality of units that can be installed compactly and has improved maintenance.

[0002]

2. Description of the Related Art Some air conditioners use a heat pump as a cooling / heating device. In some cases, a compressor for compressing refrigerant of the heat pump is driven by an engine (internal combustion engine). In such an engine-driven heat pump, the heat exchanger connected to the refrigerant circulation system is housed in a single box together with the engine and auxiliary equipment and installed as an outdoor unit from the viewpoint of equipment management. Are maintained on a regular basis.

For this reason, the outdoor unit is provided with an opening for maintenance on the outer peripheral surface, and can be opened and closed by a cover plate. However, since the maintenance opening may not be able to see all parts of the engine and auxiliary equipment at all on one side, or may not be able to access it, conventional outdoor units have multiple front and side surfaces. And a cover plate that can be opened and closed.

Generally, the outdoor unit is installed close to the roof of a building or the outer wall of a house. Further, depending on the required cooling and heating capacity, a plurality of engine-driven heat pumps are installed, and a plurality of outdoor units are arranged side by side. However, since the conventional outdoor units are provided with the maintenance opening on the front and side surfaces as described above, when a plurality of outdoor units M are arranged adjacent to the wall surface W as shown in FIG. A maintenance space S must be interposed between matching outdoor units. That is, as shown in FIG. 8, it is impossible to install the outdoor unit M so that the side surfaces of the outdoor unit M are in close contact with each other.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an outdoor unit of an engine-driven heat pump capable of improving the maintenance performance while enabling a compact installation even when a plurality of units are installed. It is in.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an engine driven heat pump for driving a compressor by an engine and forcibly circulating a refrigerant compressed by the compressor to a refrigerant circuit having a heat exchanger. , An engine room accommodating the engine and its accessories is arranged at a lower portion, and the heat exchanger is arranged above the engine room so as to open an upper surface of the engine room, and at least an upper surface of the engine room is arranged. The front and the front are openable and closable as maintenance openings.

As described above, since the maintenance opening is provided at least on the upper surface and the front surface of the engine room, the maintenance operation can be performed from only one direction on the front surface side of the outdoor unit. As a result, even when a plurality of units are provided side by side, the side surfaces can be arranged in close contact with each other. Further, since the maintenance opening is provided not only on the front surface but also on the upper surface, maintenance work can be sufficiently improved by enabling work from two surfaces.

In the above configuration, when the engine is arranged to be inclined forward with the front end in the longitudinal direction facing upward, the engine and accessories can face the opening for maintenance, and maintenance work can be performed. It will be easier to do. Further, the height of the engine room and the outdoor unit can be reduced.

[0009]

1 and 2 show an outdoor unit of an engine driven heat pump according to an embodiment of the present invention. Outdoor unit M
Has a box-shaped outer frame 20, and the engine room 1
Is provided. Further, on the side of the engine room 1, an electric component box 21 for a heat pump drive system, a valve unit 22 for a refrigerant circulation system, an accumulator 23, an oil tank 2
4 and the like are arranged.

[0010] Inside the engine room 1, the engine 2 and auxiliary components of the engine are stored together.
The engine 2 is a four-cycle water-cooled gas engine that is operated using city gas, propane gas, or the like as a fuel, and is inclined forward with its front end in the engine longitudinal direction (cylinder axial direction) obliquely upward. Around the main body of the engine 2, an ignition plug 3, an air cleaner 4, an oil filter 5, a starting motor 6, an exhaust gas heat exchanger 7, and the like are provided.
Further, a compressor (not shown) for compressing the refrigerant is connected.
Refrigerant is compressed by the compressor, and the compressed refrigerant is forcibly circulated through a refrigerant circuit constituting a heat pump.

A radiator 8 for radiating heat of the engine 2 and a fan 9 are arranged above and below the outer frame 20. Further, a heat exchanger 10 constituting the refrigerant circuit is provided at an intermediate portion of the outer frame 20. The heat exchanger 10 is formed in a plate shape, is inclined forward, and has its lower end positioned behind the outer frame 20. The fan 9 sucks the outside air and crosses the cooling air to the heat exchanger 10 and the upper heat radiation radiator 8 which are obliquely inclined forward, thereby exchanging heat.

On the upper surface of the engine room 1, the heat exchanger 10 is inclined forward and the lower end is disposed rearward as described above, so that the upper surface of the engine room is open forward. I have. The upper surface of the engine room thus opened is configured such that the lid plate 1a can be freely opened and closed by attaching and detaching bolts 11, and at the same time, the front surface of the engine room is also covered with the lid plate 1b
Can be opened and closed by attaching and detaching the bolt 11. Therefore, these two lid plates 1a and 1b are formed to form a maintenance opening of the engine room 1 by removing them. FIG. 2 shows a state in which only the front cover plate 1b is removed.

FIG. 4 shows another embodiment of the present invention. This embodiment is different from the above-described embodiment in that the two heat exchangers 10 and 10 'are arranged in a front-rear V-shape, and the engine room 1 and the refrigerant piping system 30 arranged in the lower part are front-rear. This is the point that is arranged. 5 and 6 show still another embodiment.
This embodiment is different from the first embodiment in that two heat exchangers 10 and 10 'are similarly arranged in a front-rear V-shape, and the upper fan 9 is provided obliquely forward with this. .

In each of the above embodiments, the front and upper surfaces of the engine room are not particularly limited in shape, and may be a curved surface, a flat surface, or a combination thereof. That is, the longitudinal sectional shape of the engine room is not limited to a square, but may be various shapes such as a circle and an ellipse. The cover plates 1a and 1b may be configured so that they can be individually opened and closed as in this embodiment, or may be configured such that both can be opened and closed simultaneously. Further, each surface may be further divided so as to be opened and closed by two or more lid plates.

As described above, in the outdoor unit M, at least two surfaces, the upper surface and the front surface, of the engine room 1 are configured to be openable and closable, and the maintenance opening is provided. Maintenance work can be performed from only one direction. Therefore, even when a plurality of outdoor units M are arranged side by side, as shown in FIG. 8, the side units can be arranged in close contact with each other, and extremely compact installation is enabled.

Further, since the maintenance opening is provided not only on the front surface of the engine room 1 but also on the upper surface, maintenance work can be performed from two surfaces. For this reason, there is no problem such as a part of the engine and accessories becoming invisible or inaccessible, and maintenance work is greatly facilitated. Further, as in the above-described embodiment, if the front end of the engine 2 in the longitudinal direction is inclined and disposed so as to face obliquely upward,
Since the engine 2 and accessories can be exposed to the maintenance opening, maintenance work can be further facilitated.

Further, in the case where the engine 2 is inclined as described above, the engine room 1 can be lowered, and accordingly, the height of the outdoor unit can be reduced. That is, as shown in FIG. 3, when the engine 2 is erected in the vertical direction, only the hatched portion protrudes upward, so that the engine room 1 has to be raised, but this is not the case. .
Further, when the engine 2 is set up in the vertical direction, it is impossible to reach the rear side area B of the engine 2, and even if auxiliary equipment is arranged in this area B, maintenance becomes impossible. You have to be.

[0018]

As described above, in the outdoor unit of the engine driven heat pump according to the present invention, the maintenance opening is provided at least on the upper surface and the front surface of the engine room. It becomes possible to do. Therefore, even when a plurality of outdoor units are provided side by side, the side units can be compactly arranged by closely contacting the side surfaces. Further, since the maintenance opening is provided not only on the front surface but also on the upper surface, it is possible to further improve the maintenance workability by enabling work from two surfaces.

When the longitudinal direction of the engine is arranged obliquely, the engine and accessories can be directed toward the maintenance opening, making the maintenance work easier. it can.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view schematically showing an outdoor unit of an engine-driven heat pump according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the outdoor unit with a front cover plate removed.

FIG. 3 is a schematic explanatory view of an outdoor unit when an engine is installed upright.

FIG. 4 is a vertical sectional side view schematically showing an outdoor unit of an engine-driven heat pump according to another embodiment of the present invention.

FIG. 5 is a longitudinal sectional side view schematically showing an outdoor unit of an engine driven heat pump according to still another embodiment of the present invention.

FIG. 6 is a front view schematically showing the outdoor unit shown in FIG.

FIG. 7 is a plan view showing an arrangement example of a plurality of outdoor units.

FIG. 8 is a plan view illustrating another arrangement example of the plurality of outdoor units.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine room 2 ... Engine 1a, 1b Cover plate (opening for maintenance) 10, 10 '(for refrigerant circulation circuit) Heat exchanger 20
Outer frame 30 Refrigerant piping system M Outdoor unit

Claims (2)

(57) [Claims] An engine driven heat pump for driving a compressor by an engine and forcibly circulating a refrigerant compressed by the compressor through a refrigerant circulation circuit having a heat exchanger, wherein the engine and its accessories are housed. An engine in which a room is arranged at a lower portion, the heat exchanger is arranged above the engine room so as to open an upper surface of the engine room, and at least an upper surface and a front surface of the engine room can be freely opened and closed as maintenance openings. The outdoor unit of the drive heat pump. 2. An outdoor unit for an engine-driven heat pump according to claim 1, wherein the engine is disposed with the longitudinal front end thereof inclined forward.