JP2001141331A - Engine room structure of engine driven heat transferring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modified engine room with advantages such that a main body of a casing comprising an engine room is designed to be as compact as possible, maintainability is improved, and a compressor and a generator are prevented from heating up. SOLUTION: An engine 22 and a compressor 21 are accommodated within an engine room 20 wherein a cylinder 81 of the engine 22 protrudes toward one side from a crankcase 85 and a compressor 21 is disposed outwardly of the crankcase 85 on the side opposite to the cylinder 81, with the driving force to be transmitted from a pulley 24 on the front end of a crankshaft to a pulley of the compressor 26 via a belt 25. Further, a generator 23 is dispoded behind the crankcase 85 on the side opposite to the cylinder 81, with the driving force to be transmitted from a pulley 27 on the rear end of the crankshaft to a pulley of the generator via belt 28. Wherein, a casing body 2 is formed for accommodating the engine 22 and the compressor 21 with the generator 23 disposed behind the back portion of the casing body 2, allowing the generator 23 to be supported by a cover 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an engine room equipped with a compressor, an engine, and the like in an engine-driven heat transfer device applied to an air conditioner, a refrigeration system, and the like.

[0002]

2. Description of the Related Art Conventionally, an engine-driven heat transfer apparatus having a compressor for circulating a refrigerant through an outdoor heat exchanger, an indoor heat exchanger, and the like in a refrigerant circuit and driving the compressor by an engine is air-conditioned. It is generally known in devices and the like. When applied to an air conditioner, the engine-driven heat transfer device includes an indoor unit disposed in one or a plurality of rooms and an outdoor unit disposed outside the room. The outdoor unit includes an engine room. For example, an engine room is provided below a casing of the outdoor unit, and a power unit including the compressor and the engine is housed in the engine room. An outdoor unit is composed of the engine room, an outdoor heat exchange chamber disposed above and for housing an outdoor heat exchanger, and a piping room disposed on the side (for example, Japanese Patent Application Laid-Open No. 7-1995). 239136).

[0003]

By the way, in this type of heat transfer device, in addition to the compressor, the engine, etc., a generator is provided in a power section for supplying electric power to various electric devices. There is one in which a generator is driven in addition to a compressor.

When a generator is provided in addition to a compressor, an engine, and the like, the compressor and the generator are connected to the crankshaft of the engine via transmission means, and the engine and the compressor are connected to these components. The power unit including the generator and the generator is arranged in the engine room, but if the entire power unit including the generator is housed in the box-shaped casing main body constituting the engine room, the casing main unit becomes large. Therefore, the size and weight of the outdoor unit are likely to be increased. Further, when the engine, the compressor, the generator, and the like are densely housed inside the box-shaped casing main body in this manner, it is difficult to perform work during inspection and maintenance.

[0005] Further, if the compressor and the generator are arranged at positions which are susceptible to heat radiated from the engine,
During operation, there is also a problem that the temperature of the compressor and the generator excessively rises due to radiant heat from the engine in addition to the heat generated by the engine itself, and as a result, abrasion of the sliding portion tends to occur.

In view of the above circumstances, the present invention makes it possible to reduce the size and weight of the outdoor unit by making the casing body constituting the engine room as compact as possible, and to improve the maintainability. It is an object of the present invention to provide a structure of an engine room of an engine-driven heat transfer device which can suppress a rise in temperature of a compressor and a generator due to radiant heat from the engine.

[0007]

According to the present invention, a compressor of a heat pump device and an engine for driving the compressor are arranged in a casing forming an engine room, and a power generator driven by the engine is provided. In the engine-driven heat transfer device provided with the engine, the crankshaft of the engine is disposed in the front-rear direction of the engine room, and a first drive vehicle is provided at a front end of the crankshaft, and a second drive vehicle is provided at a rear end of the crankshaft. An engine cylinder extends from the crankcase that houses the crankshaft to one side in the left-right direction, and is located outside the crankcase and in the left-right direction on the opposite side to the cylinder. A compressor provided with a first driven vehicle to which a driving force is transmitted from the first driving vehicle via a wrapping transmission member at a front end portion, and at the rear of the crankcase and in the left-right direction In a position opposite to the cylinder, a generator provided at a front end of a second driven vehicle to which driving force is transmitted from the second driving vehicle via a winding transmission member, A casing main body is formed so as to house the engine and the compressor, and a generator is positioned behind the rear part of the casing main body, and a cover that covers the generator and is detachably fixed to the casing main body is provided. The above-mentioned generator is supported by this cover.

According to this structure, the compressor is disposed outside the crankcase of the engine on the side opposite to the cylinder of the engine, and the generator is positioned behind the crankcase on the side opposite to the cylinder. Radiated heat from the cylinder of the engine to the compressor and the generator as much as possible, and the temperature rise of the compressor and the generator is suppressed.

Further, the casing body is formed so as to house the engine and the compressor, and the generator is disposed so as to be located outside the rear of the casing body, so that the entire power unit including the generator is provided. The casing body is more compact than when the casing body is formed so as to be accommodated. In addition, the generator is protected by being covered with the cover, and if the cover is removed, the generator is exposed, which facilitates inspection, maintenance, and the like.

In the present invention, a ring member having a gear for interlocking with a starter is mounted on the rear end of the crankshaft, and the second drive wheel is mounted on the ring member radially outward of the crankshaft. Is preferred.

[0011] In this case, the mounting position of the second driving vehicle by bolts or the like is radially outward, as compared with the case where the second driving vehicle is formed so as to be directly mounted on the crankshaft. Since the second moment of area of the vehicle is increased, it is possible to reduce the weight of the second drive vehicle while securing the required rigidity.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an outdoor unit and its internal structure in an air conditioner as an example of an engine driven heat transfer device, and FIG. 2 shows an exploded upper and lower casing of the outdoor unit. In FIG. 1, the inside is shown with the covers and panels of the upper and lower casings removed for convenience.

As shown in these figures, the outdoor unit has a frame composed of a lower casing 1 as a casing forming an engine room and an upper casing 10 arranged above the casing. The structure incorporates the components of the outdoor unit.

The lower casing 1 is formed in a substantially rectangular parallelepiped box shape, and a frame 2 (casing main body) constituting a main part of the casing 1 is formed of a cast product in which walls such as upper and lower surfaces, side surfaces, and a back surface are integrally formed. Have been.

In this embodiment, as shown in FIG. 2, the frame 2 has an opening 3 substantially entirely on the front side and partially on one side (in the example shown, the right side as viewed from the front). , An opening 4, an upper surface 2 a, a bottom surface 2
b, each wall of the back part 2c and the left side part 2d, a column 2e provided at a corner part between the front side and the right side, and a horizontal bar part 2f provided between the openings 4 on the right side. The inside that is integrally molded with aluminum die casting and surrounded by each of the above walls,
The engine room 20 houses the power unit. The bottom surface portion 2b projects outward from the left side surface portion 2d of the frame 2, and a small chamber for mounting a refrigerant circulation system pipe or the like is formed above the projecting portion 2g.

An opening 3 on the front side of the frame 2 is a front cover 5 and an opening 4 on the right side is a right side cover 6.
And the overhanging portion 2g outside the left side surface portion 2d.
Are covered by a left side cover 7, and these covers are detachably attached to the frame 2 by bolts or the like. A first rear cover 101, a second rear cover 102, and a generator housing cover (not shown in FIG. 2) are attached to the rear side of the frame 2.
These will be described later in detail.

On the other hand, the upper casing 10 has a main body portion 11 made of a synthetic resin having a cavity 12 for disposing a fan at substantially the center, and a front cover 13 and a ceiling cover 14 are provided on the main body portion 11. , A side cover 15 and the like are detachably attached with bolts and the like, and a fan guard 16 is detachably attached to the front cover 13.

An outdoor heat exchanger 17 and a radiator 56 are mounted on the back side of the upper casing body 11, and the upper casing body 11 and the outdoor heat exchanger 17 are installed on the frame 2. It is fixed. Further, a rear upper cover 18 is attached by bolts or the like to the left side on the rear side extending between the frame 2 and the upper casing body 11, and electrical components are accommodated on the left side of the upper casing body 11. The electrical component box 19 is to be assembled.

An engine room 20 formed by the frame 2 of the lower casing 1 has a compressor 21 of a heat pump device,
An engine 22 for driving the compressor 21 and the like are housed, and a generator 23 driven by the engine 22 is provided.
(See FIGS. 3 to 5). The upper casing 10 has a blower fan 30
Is arranged. The intake system, the fuel system, the exhaust system, the lubrication system, and the cooling system of the engine and a part of the refrigerant circulation system connected to the compressor 21 are connected to the casings 1 and 10.
It is arranged over.

FIG. 3 shows the internal structure of the outdoor unit. As shown in FIG. 3 and FIG. 1, the driving force of the engine 22 is controlled by a first crank pulley 24 (first driving wheel) and a belt 25 (winding). The power is transmitted to the compressor 21 via a first transmission mechanism including a hanging transmission member) and a compressor pulley 26 (first driven vehicle), and a second crank pulley 27 (second driving vehicle) and a belt 28 ( Winding transmission member) and generator pulley 2
9 (second driven vehicle) to the generator 23 via a second transmission mechanism. 23 in FIG.
a is an output terminal of the generator 23.

The engine 22 is a water-cooled gas engine.
And an intake pipe 32 for introducing outside air to the air cleaner 31 and an intake pipe 33 for guiding the air passing through the air cleaner 31 to the engine. The air cleaner 31 and the intake pipe 32 are arranged in the upper casing 10. The intake pipe 33 extends downward from the air cleaner 31, extends through the window hole (not shown) provided in the upper surface 2 a of the frame 2, into the engine room 20, and extends above the head 22 b of the engine 22. Mixer 34 installed in
It is connected to the. The air and the fuel are mixed by the mixer 34, and the air-fuel mixture is supplied to the engine 22. In addition, below the air cleaner 31, an oil separator 35 connected to the blow-by gas passage is arranged.

The fuel system of the engine includes a fuel supply pipe 36 connected to the mixer 34.
The upstream side extends through the left side surface portion 2d of the frame 2 and extends outward, and is connected to an external fuel gas supply source (not shown). 38 and a zero governor 39 are interposed.

The exhaust system of the engine includes an exhaust pipe 4 derived from an exhaust gas heat exchanger 42 connected to the side of the engine 22.
The exhaust pipe 41 extends upward, reaches the inside of the upper casing 10 through a hole (not shown) provided on the upper surface of the frame 2, and is connected to an exhaust silencer 43 disposed above the air cleaner 31. It is connected. Reference numeral 44 denotes a drain filter for filtering drain water from the exhaust gas heat exchanger 42, the exhaust silencer 43, and the like.

The engine lubrication system has an oil tank 45. The oil tank 45 is disposed on the side of the engine 22 and horizontally on the cylinder block 22c.
And the oil flow pipe 4 disposed below the head portion 22b.
6 is connected to the oil pan of the engine 22.

The cooling system of the water-cooled engine is provided with a cooling water pipe 50a for guiding cooling water discharged from a water pump 51 to the engine 22, and the cooling water pipe 50a is supplied from the exhaust gas heat exchanger 42 via the water pump 52 to the engine 22. Is connected to the cooling water inlet of the water jacket 53, and the thermostat 5 is connected to the cooling water outlet of the water jacket 53.
The cooling water pipe 50b led out through the line 4 is a linear three-way valve 5
5 is connected. Further, two cooling water pipes 50c and 50d are led out from the linear three-way valve 55, and the cooling water pipes 50c and 50d are connected to the radiator 56 and the double pipe heat exchanger 57, respectively. The cooling water pipes 50 e and 50 f respectively derived from the heat exchanger 57 join and are connected to the cooling water pump 51. Also, the recovery tank 5 is connected to the cooling water pipe 50f.
8 and the pressure cap 59 are connected.

The radiator 56 is provided on the front side of the outdoor heat exchanger 17 and is arranged behind the blower fan 30. Further, the double-pipe heat exchanger 57, the recovery tank 58, and the pressure cap 59 are disposed above the upper casing 10.

On the other hand, the refrigerant circulation system connected to the compressor 21 has a flexible tube 6 at the discharge port of the compressor 21.
1a, the discharge side refrigerant pipe 60a connected to the upstream end side
And a flexible tube 61b at the suction port of the compressor 21.
And a downstream end of the discharge side refrigerant pipe 60a and a downstream side of the discharge side refrigerant pipe 60a.
The upstream end of Ob is connected to the four-way valve 62. An oil separator 63 is interposed in the discharge-side refrigerant pipe 60a,
An accumulator 64 is interposed in the suction side refrigerant pipe 60b. The oil separator 63 and the accumulator 64 are arranged on the left side of the upper casing 10.

From the four-way valve 62, the refrigerant pipes 60c, 60e
Is derived. The refrigerant pipe 60c extends downward to reach a small chamber outside the left side surface portion 2d of the frame 2, and branches into a plurality of parts at the tip of the small chamber via a packed valve 65 and a strainer 66. A flange 67 is provided at the tip.

The refrigerant pipe 60e is connected to the double pipe heat exchanger 5
7, the refrigerant reaches the outdoor heat exchanger 17, and the refrigerant pipe 60f led out of the outdoor heat exchanger 17 reaches the small chamber outside the left side surface portion 2d of the frame 2, where the filter dryer 68 and the sight glass are placed. 69, packed valve 7
The electronic expansion valve 72 and the strainer 73 are interposed in the branch pipe 60g led out from the branch section 71 through the branch pipe 71, and a flange 7 is provided at the tip of each branch pipe 60g.
4 are provided.

The piping for connection to a plurality of indoor heat exchangers (not shown) is detachably connected to the flanges 67, 74 at the ends of the branch pipes 60d and 60g.

The details of the structure of the engine room in such an outdoor unit will be described with reference to FIGS.

The engine 22 disposed in the engine room 20
Includes a cylinder 81, a crankshaft 84 connected to a piston 82 in the cylinder 81 via a connecting rod 83,
A crankcase 85 for accommodating a crankshaft is provided in series with the cylinder 81. The crankshaft 84 is disposed in the front-rear direction of the engine room casing 1, and the cylinder 81 is moved from the crankcase 85 in one of the left and right directions. (Right side in FIG. 4).

The first crank pulley 24 is attached to the front end of the crankshaft 84 with bolts 86. Further, a position outside the crankcase 85 and opposite to the cylinder 81 in the left-right direction, that is, FIG.
At the left side of the crankcase 85, the compressor 21
Is arranged. A compressor pulley 26 is attached to the front end of the rotating shaft of the compressor 21, and a belt 25 is wound around the compressor pulley 26 and the first crank pulley 24. In the illustrated engine, the cylinder 81 is connected to the crankshaft 84 in the crankcase 85.
A balancer 86 is provided on the side part opposite to the side,
The compressor 21 is disposed outside the portion where the balancer 86 is provided.

The housing of the compressor 21 is the engine 2
The engine 22 and the compressor 21 are mounted on the bottom surface of the frame 2 via the mount 87 and the mount bracket 88 in this state (see FIG. 1).

The second crank pulley 27 is attached to the rear end of the crankshaft 84. In the illustrated embodiment, a ring member 90 having a gear 91 for interlocking with the starter is fitted around the rear end of the crankshaft 84 so that the engine can be started by a starter (not shown). A ring member 90 is fixed to the crankshaft 84, and a pulley component member 93 is attached to the ring member 90. The pulley component 93 is formed by forming the second crank pulley 27 at the tip of a cylindrical portion 94 having a diameter larger than that of the crankshaft 84.
The above-mentioned cylindrical portion 94 is formed radially outward of the ring member 9.
It is fixed to 0 with bolts 95.

Behind the crankcase 85 and
The generator 23 is disposed at a position opposite to the cylinder 81 in the left-right direction, that is, at a left side portion behind the crankcase 85 in FIG. Therefore, the compressor 21
The generator 23 is located substantially behind. A generator pulley 29 is attached to the front end of the rotating shaft 23 a of the generator 23, and a belt 28 is wound around the generator pulley 29 and the second crank pulley 27.

The frame 2 is formed to house the engine 22 and the compressor 21. That is, the frame 2 is formed to be relatively compact enough to accommodate a portion of the power unit including the engine 22, the compressor 21, and the generator 23 except for the generator 23. 2 is located behind the rear portion 2c.

The rear portion 2c of the frame 2 has a predetermined range extending from a portion located behind the crankcase 85 of the engine 22 to a portion located forward of the generator 23. An indented concave portion 96 is provided, and a space 97 for disposing a transmission mechanism is formed in the concave portion 96. A through-hole 98 is formed in the wall plate 96a inside the concave portion 96 at a position corresponding to the crankshaft 84, and the cylindrical portion 94 attached to the end of the crankshaft 84 via a ring member 90 is provided with the above-described cylindrical portion 94. The distal end portion is inserted into the through hole 98 and protrudes into the transmission mechanism arrangement space 97. The second crank pulley 27 at the end of the tubular portion 94, the belt 28 and the pulley 29 linked to the second crank pulley 27 are arranged in the transmission mechanism arrangement space 97.
In addition, the exhaust gas heat exchanger 42 is disposed in the back of the engine room 20 on the side of the portion where the concave portion 96 is provided.

A cover 100 is provided behind the rear portion 2c. In the illustrated embodiment, the cover 10 on the rear side is provided.
Reference numeral 0 denotes three members, a first rear cover 101, a second rear cover 102, and a generator housing cover 103, which are detachably fixed to the frame 2.

The structure of these covers will be described in detail. The first rear cover 101 is formed in a flat plate having a size corresponding to the rear surface, and the first rear cover 101 covers the power transmission mechanism space 97 so as to cover the rear surface 2c. It is located on the rear side. The front portion of the generator 23 is fixed to the first rear cover 101 with bolts 104, and the rotating shaft 2 of the generator 23
3b penetrates the first rear cover 101 and protrudes into the transmission mechanism arrangement space 97.

The second rear cover 102 is located on the rear side of the first rear cover 101 and faces a flat plate portion 102a facing the first rear cover 101, a portion 102b protruding forward from the periphery thereof, and a peripheral edge connected to this portion. Part 102c
And its peripheral edge 102c is the first rear cover 1
01 in the state where they are superimposed,
At 05, it is fixed to the rear portion 2c of the frame 2. Second
The rear cover 102 has a cutout hole 1 corresponding to the generator 23.
06 is provided, and the generator 23 projects rearward through the cutout hole 106.

The generator housing cover 103 is located on the rear side of the second rear cover 102,
It is formed in a box shape that covers the upper, lower, left, right, and rear portions of a portion protruding from the rear cover 102, and a front end peripheral edge portion is fixed to the second rear cover 102 with bolts 107. The lower surface of the generator housing cover 103 is supported via a first stay 111 on a base rail 110 for mounting the outdoor unit. Reference numeral 121 denotes a bolt for fixing the first stay 111 to the base rail.

A second stay 11 is provided at a lower rear portion of the generator 23.
2 is attached, and the first stay is aligned with the second stay 112.
The position of the stay 111 is determined.
The generator housing cover 103 that covers the generator 23 from behind is fastened together with the second stay 112 by bolts 120. Therefore, the rear portion of the generator 23 is supported by the base rail 110 via the second stay 112, the generator housing cover 103, and the first stay 111.

Note that legs 115 extending in the front-rear direction are provided on both left and right sides of the lower end of the lower casing, and these legs 115 are fixed to the base rail 110.

According to the structure of this embodiment as described above,
When the compressor 21 and the generator 23 are located outside and behind the crankcase 85 of the engine 22, the cylinder 8
1, the radiant heat of the cylinder 81 is blocked by the crankcase 85 and hardly reaches the compressor 21 or the generator 23. Therefore, during driving,
A situation in which the compressor 21 and the generator 23 excessively increase in temperature due to the radiant heat from the cylinder 81 of the engine 22 in addition to the heat generated by the compressor 21 and the generator 23 is prevented. Can be

The frame 2 of the lower casing 1 constituting the engine room 20 is formed so as to be capable of accommodating the engine 22 and the compressor 21, and the generator 23 is disposed behind the back of the frame 2. Therefore, as compared with the case where the frame 2 is formed so as to accommodate the entire power unit including the generator 23, the frame 2 is downsized, which is advantageous in reducing the size and weight of the outdoor unit.

The generator 2 located behind the frame 2
3 is covered and protected by the generator housing cover 103, is fixed to the first rear cover 101 with bolts 104, and is connected to the generator housing cover 10 via a stay 112.
3, and further supported by the base rail 110 via the stay 111, the mounting strength of the generator 23 is sufficiently ensured.

Then, the bolts 107, 120 and 121
By removing the generator housing cover 103 and the stay 111, the rear portion of the generator 23 is exposed to the outside, so that simple inspection and maintenance of the generator 23 can be performed in this state. The front end of the generator 23 is the first rear cover 1.
01, and the first rear cover 101 and the second rear cover 102 are detachable from the frame 2. Therefore, when performing relatively large-scale maintenance or repair of the generator 23, Second rear cover 101, 1
By removing 02, the generator 23 can be separated from the outdoor unit. Therefore, the maintainability of the generator 23 is improved.

In the state where the engine 22, the compressor 21, and the generator 23 are arranged as described above,
The first and second crank pulleys 24 and 27 are attached to the front and rear ends of the crankshaft 84 so that the driving force of the crankshaft 84 is transmitted to the compressor 21 and the generator 23. A ring member 90 having an interlocking gear 91 is attached. In this embodiment, in particular, a member 93 constituting the second crank pulley 27 is attached to the crankshaft 84 via the ring member 90, whereby a pulley constituting member is provided. The structure is advantageous for ensuring the rigidity of the 93 and reducing the weight.

That is, the pulley component 93 is attached to the ring member 90 radially outward of the crankshaft 84 by the bolt 9.
5, the mounting position by the bolt 95 is radially outward as compared with the case where the member constituting the second crank pulley is formed so as to be directly mounted on the crankshaft. As the diameter of the cylindrical portion 94 increases, the second moment of area increases.
The pulley component 93 can be formed of a lighter member than the crankshaft 84 while securing the required rigidity.

[0052]

As described above, according to the present invention, the engine is disposed in the engine room such that the cylinder extends from the crankcase to one side in the left-right direction. The compressor is arranged at a position opposite to the cylinder, and the generator is arranged at a position opposite to the cylinder in the left and right direction behind the crankcase. Temperature rise of the compressor and the generator due to radiant heat from the fuel cell can be suppressed, and reliability can be improved.

Further, a casing main body is formed so as to accommodate the engine and the compressor, and a generator is positioned behind the rear portion of the casing main body, and covers the generator and is detachably fixed to the casing main body. Since the cover is provided and the generator is supported by the cover, the casing body can be made compact, which is advantageous for reducing the size and weight of the device, and furthermore, the cover protects and supports the generator. When the cover is removed, the generator is exposed, so that inspection and maintenance can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of an outdoor unit of an air conditioner according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a casing of the outdoor unit.

FIG. 3 is an explanatory diagram showing an internal configuration of the outdoor unit.

FIG. 4 is a horizontal sectional view showing a structure of an engine room and an engine, a compressor, a generator, and the like arranged in the engine room.

FIG. 5 is a partial sectional side view showing a structure of the engine room.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower casing 2 Frame 2c Back part 20 Engine room 21 Compressor 22 Engine 23 Generator 24 First crank pulley 25 Belt 26 Compressor pulley 27 Second crank pulley 28 Belt 29 Generator pulley 81 Cylinder 84 Crankshaft 85 Crankcase 100 cover

Claims (2)

[Claims] An engine-driven heat transfer device including a compressor of a heat pump device and an engine for driving the compressor in a casing forming an engine room, and a generator driven by the engine. In the apparatus, the crankshaft of the engine is disposed in the front-rear direction of the engine room, a first drive vehicle is provided at a front end of the crankshaft, and a second drive vehicle is provided at a rear end of the crankshaft. An engine cylinder is extended from the case to one side in the left-right direction, and wound from the first driving wheel at a position outside the crankcase and opposite to the cylinder in the left-right direction. A first driven vehicle to which a driving force is transmitted via a hook transmission member is provided with a compressor provided at a front end thereof, while a compressor is provided at the rear of the crankcase and in the left-right direction with respect to the cylinder. A generator provided at a front end of a second driven vehicle to which a driving force is transmitted from the second driven vehicle via a winding transmission member is disposed at a position on the opposite side, and accommodates the engine and the compressor. The casing body is formed so that the power generator is located behind the rear surface of the casing body, and a cover that covers the generator and is detachably fixed to the casing body is provided. The structure of the engine room of the engine-driven heat transfer device, wherein the engine is supported. 2. A ring member having a gear for interlocking with a starter is attached to a rear end of the crankshaft, and a second drive wheel is attached to the ring member radially outward of the crankshaft. The structure of the engine room of the engine-driven heat transfer device according to claim 1.