JP2694902B2 - Equipment room ventilation structure for engine driven heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention drives a compressor by an engine such as a gas combustion internal combustion engine, and cools it by a refrigerant pressurized by the compressor.
In an engine-driven heat pump device for heating and the like, regarding a structure for ventilating a device room in which the engine or the like is housed, particularly, an air that can improve ventilation capacity while suppressing external leakage of noise. Regarding improvement of introduction passage.

[Conventional technology]

In an engine-driven heat pump device, the engine, the compressor, etc. are noise sources. Therefore, it is necessary to make sure that the noise is not leaked to the outside by configuring the equipment room that accommodates these as airtight as possible. is necessary.

On the other hand, the higher the degree of airtightness inside the equipment room, the higher the room temperature, especially in the case of an engine using gas fuel,
There is a problem that the mixing ratio of gas fuel and air fluctuates, and the startability of the engine deteriorates. To prevent this, it is necessary to adequately ventilate the equipment room. In addition, the ventilation is necessary because it is necessary to purge the gas inside the equipment chamber before starting the engine.

[Problems to be solved by the invention]

As described above, in the engine-driven heat pump device, it is necessary to seal the equipment room from the viewpoint of noise reduction, and it is necessary to provide as large an opening as possible from the viewpoint of ensuring ventilation, and there are conflicting requirements. .

The present invention has been made to realize the above-mentioned two conventional requirements, and is an engine drive type that can ensure sufficient ventilation to suppress an increase in room temperature and can suppress external leakage of noise from the equipment room. An object is to provide an equipment room ventilation structure for a heat pump device.

[Means for solving the problem]

According to the present invention, the unit case 2 having a substantially closed box shape is divided into a radiator chamber 7 and a device chamber 8 by a partition wall 6, and an outdoor heat exchanger equipped with a blower fan 7a is accommodated and arranged in the radiator chamber 7. The engine 12 in the equipment chamber 8, the exhaust gas heat exchanger provided in the exhaust system of the engine 12, the compressor 14 driven by the engine 12, and the engine cooling water are used as the outdoor heat exchanger and the exhaust gas heat. In a device room ventilation structure of an engine-driven heat pump device 1 in which a cooling water pump 16 that circulates through an exchanger and an engine cooling jacket is housed and arranged, a refrigerant that heats the engine cooling water when the temperature is below a predetermined temperature. The engine 12 is provided with a thermostat valve 18 capable of supplying heat to the heat exchanger and capable of supplying the outdoor heat exchanger when the temperature is equal to or higher than a predetermined temperature. Water pump 16, to position the drive transmission belt 15 for coupling the output shaft 12c and the compressor 14 of the engine 12, the unit case 2 legs 3a
And the first outside air introduction ducts 23, 25 and the second outside air introduction ducts 24, 26 are arranged in parallel in the space between the bottom surface and the installation surface of the unit case 2 formed by the legs 3a.
The first and second outside air introducing ducts 23 and 24 are connected to the outside air
The second starting end openings 9a, 9a are provided so as to be located on the back side at the time of installation, and the throttles (communication ports) 23a, 24a are provided in the middle of the first and second outside air introducing ducts. First and second end openings 25a, 26a for communicating the outside air introducing duct with the inside of the equipment chamber 8 are located near the cooling water pump 16 and the transmission belt 15, respectively, and a blower fan 27 is provided near the first end opening 25a. And a guide duct 25b for guiding the air flow from the blower fan 27 to the cooling water pump 16, an exhaust port 21a is provided at the upper rear side of the equipment chamber 8, and an exhaust fan 21 is provided at the exhaust port 21a. The exhaust duct 22 is provided on the back surface of the equipment chamber 8, and the exhaust port 21a is provided at the upper end of the exhaust duct 22.
And the ventilation outlet 22a is provided at the lower end so as to communicate with the outside air.

[Action]

According to the equipment room ventilation structure according to the present invention, the engine cooling water is provided with the thermostat valve 18 that can be supplied to the refrigerant heat exchanger when the temperature is equal to or lower than the predetermined temperature and can be supplied to the outdoor heat exchanger when the temperature is equal to or higher than the predetermined temperature. Therefore, the coolant can be heated using the cooling water heated by the exhaust gas heat exchanger and the engine cooling jacket, and when the cooling water temperature rises abnormally, it is separated from the equipment room 8 and the outside air is introduced by the blower fan 7a. Since the cooling water is sent to the outdoor heat exchanger arranged in the radiator chamber 7, the abnormal temperature rise of the cooling water can be reliably prevented, and the overheating of the cooling water pump 16 can be avoided.

Since the first and second outside air introducing ducts 23 and 24 are arranged by utilizing the bottom space formed by supporting the unit case 2 through the leg portions 3a, the outside space is effectively utilized by using the dead space. It can be arranged and the problem that the height of the device becomes high can be avoided by providing the outside air introduction duct.

Since the throttles 23a and 24a are provided in the middle of the first and second outside air introducing ducts, the first and second introducing ducts function as expansion chambers, and external leakage of engine sound and the like in the equipment room can be suppressed.

The cooling water pump 16 and the transmission belt 15 are located at the separated positions of the equipment chamber, and the end openings 25a and 26a of the first and second outside air introduction ducts are located near the cooling water pump 16 and the transmission belt 15, respectively. Further, since the exhaust fan 21 is arranged above the equipment chamber 8, the air from the first and second outside air introduction ducts hits the equipment such as the cooling water pump 16 and the transmission belt 15 which require cooling, and Since the air can be efficiently cooled and the air enters the device room 8 through the first and second terminal openings 25a and 26a which are separated from each other in the device room, the air flow from the lower part of the device room to the upper part of the device room 8 in a wide range. Can be formed, and the equipment room 8 can be reliably ventilated.

Further, since the blower fan 27 is provided in the vicinity of the first terminal opening 25a and the guide duct 25b for flowing the air toward the cooling water pump 16 is provided, a large amount of air reliably hits the cooling water pump 16 and the cooling water is The pump 16 can be cooled more reliably.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 are views for explaining a device room ventilation structure of an engine-driven heat pump device according to an embodiment of the present invention.

First, in FIGS. 1 and 2 showing the heat pump device of the present embodiment, reference numeral 1 denotes an engine-driven heat pump device of the present embodiment, in which a unit case 2 accommodates various devices described later. Is configured. This unit case 2
Is a rectangular parallelepiped having a back wall 4a, a front wall 4b, and left and right walls 4c, 4d standing on a bottom wall 3, and a top wall 5 arranged at the upper end of the side wall 4. The interior is divided by a partition wall 6 into a radiator chamber 7 and a device chamber 8. The front wall 4b located on the front side when the side wall 4 is installed is divided into left and right sizes corresponding to the radiator chamber 7 and the equipment chamber 8,
And it is removable. And the radiator chamber 7
An outdoor heat exchanger having a blower fan 7a is housed and arranged therein. Further, leg portions 3a are fixed to four lower surfaces of the bottom wall 3, and when the apparatus 1 is transported by a four lift or the like, the outer portion of the leg portion 3a of the bottom wall 3 is lifted by a support pawl of a forklift. Will be done.

Further, a lower layer duct 9 and an upper layer duct 10 constituting an air introducing duct, which will be described later, are provided on the lower surface and the upper surface of the equipment chamber 8 portion of the bottom wall 3, respectively. This upper duct
A base bracket 11 is fixed to the upper surface of the 10, and a 4-cycle engine 12 is mounted on the bracket 11. A thermostat valve 18 is arranged on the side opposite to the radiator chamber of the cylinder body of the engine 12, and a cooling water hose 12e from the cylinder head is connected to the inlet side of the thermostat valve 18. Although not shown, the first port 18a of the thermostat valve 18 that opens when the temperature is 70 ° C. or lower is a refrigerant heat exchanger that heats the refrigerant of the compressor, and the second port 18b that opens when the temperature is 70 ° C. or higher is outdoor. It is connected to the heat exchanger.

A silencer 13 is mounted above the engine 12 via a bracket, and the silencer 13 and the engine 12 are connected by an exhaust pipe 12a. An air cleaner 17 is arranged above the silencer 13 and is fixed to the right wall 4d of the unit case 2. Although not shown, the air cleaner 17 is connected to a gas mixer attached to the engine 12 via an intake hose, and a gas source is connected to the gas mixer via a solenoid valve and a zero governor. .

Further, an electric equipment box 19 for accommodating electric equipment is arranged above the air cleaner 17, and this is fixed to the ceiling wall 5 via a bracket. This electrical box
A guide duct 20 is arranged between 19 and the right wall 4d, and this duct 20 is for guiding the outside air from the opening 4e of the right wall 4d to the intake port 19a of the electrical equipment box 19. Two exhaust fans 21 are arranged on the upper part of the back wall 4a of the unit case 2, and the exhaust ports of the exhaust fans 21 are arranged.
An exhaust duct 22 is connected to 21a. This duct 22
Extends downward and has a ventilation outlet 22a formed at the lower end.

Furthermore, a compressor 14 is attached to the side wall of the radiator chamber of the cylinder body of the engine 12, and the rotary shaft 14a of the compressor 14 is parallel to the crankshaft 12c of the engine 12. The driven pulley 14b mounted on the rotary shaft 14a and the drive pulley 12d mounted on the outward protruding end of the crankshaft 12c of the engine 12 are connected by a transmission belt 15.

A cooling water pump 16 is arranged below the compressor 14 in the same direction as the compressor 14. A return hose 16a from the outdoor heat exchanger arranged in the radiator chamber 7 is connected to the suction port of the cooling water pump 16,
The supply hose 16b connected to the discharge port is the silencer 1
It is connected to the inlet pipe 13a of the exhaust gas heat exchanger provided in the inside of the pipe 3. The outlet pipe 13b of this heat exchanger is connected to the cylinder head of the engine 12 by a cooling water hose 12b.

The lower duct 9 is a box-shaped member formed by welding and fixing a steel plate to the lower surface of the bottom wall 3. As shown in the sectional plan view of FIG. There are two systems. The first lower layer duct 23 extends from the rear surface A side to the front surface B side, and has an L-shape in plan view bent at a right angle. The second lower layer duct 24 is formed in a U-shape whose bottom is on the front side B side. And the above first and second
At the rear side A side end of the lower layer ducts 23, 24, an opening 9 for outside air introduction
Many a are formed, and the first and second lower layer ducts 23, 24
On the top wall of the tip of the upper duct, that is, the bottom wall portions of the first and second upper ducts 25 and 26 of the upper duct 10, the first and second upper ducts 25,
A communication port 23a that communicates with the inside of 26 and functions as a diaphragm.
24a are formed.

In addition, the upper duct 10 also has the same bottom wall 3 as the lower duct 9.
And have a box shape, and the upper surface thereof serves as the base of the engine 12 and the cooling water pump 16 as described above. The upper duct 10 is divided into first and second upper ducts 25 and 26, as shown in the sectional plane view of FIG. 4, and the communication port is formed on the front side B of the first upper duct 25. twenty three
a is located. A communication opening 25a that connects the first upper layer duct 25 and the equipment chamber 8 is formed near the rear surface A side of the first upper layer duct 25, and a blower fan 27 is arranged in the opening 25a. . Further, a guide duct 25b is attached so as to cover the blower fan 27, and the duct 25b surrounds the rear portion of the cooling water pump 16 (see FIG. 5), whereby the air from the blower fan 27 is guided. The cooling water pump 16 is made to flow in the axial direction.

Further, the communication port 24a is located near the rear surface A side of the second upper layer duct 26, and a communication opening 26a for communicating the duct 26 with the equipment chamber 8 is formed near the front surface B side. . This communication opening 26a is the transmission belt 1 of the engine 12 described above.
It is located near 5 (see Fig. 5).
The sound absorbing material is attached to the inner surfaces of the first and second upper ducts 25 and 26.

 Next, the operation and effect of this embodiment will be described.

In the ventilation structure of this embodiment, the exhaust fan 2 in the equipment room 8
1. By operating the blower fan 27, outside air is introduced into the equipment room 8 in two systems. First, as indicated by a black arrow C in each figure, the outside air introduced into the first lower layer duct 23 through the outside air inlet 9a flows into the first upper layer duct 25 through the communication port 23a and the blower fan 27 Is blown into the equipment chamber 8 and guided along the cooling water pump 16 by the guide duct 25b. In addition, as shown by the white arrow D, the outside air introduced into the second lower layer duct 24 from the outside air introduction port 9a is connected to the communication port 24a.
To the second upper layer duct 26 from the communication port 26a to the equipment chamber 8 and, at this time, the compressor 14 driving transmission belt 15
Will be cooled. Furthermore, as indicated by the thin arrow E, the outside air introduced from the outside air introduction port 4e formed in the upper portion of the right wall 4d of the unit case 2 is guided by the guide duct 20.
Through the electrical equipment case 19 into the equipment room 8. Then, the air C, D, E that has flowed into the equipment chamber 8 is sent to the exhaust duct 22 by the exhaust fan 21,
22 is discharged to the outside (see arrow F).

As described above, in this embodiment, since the introduction duct for positively introducing the outside air into the equipment room 8 is provided, the outside air is sufficiently introduced into the equipment room 8 and the air stays in the equipment room 8. Is reliably ventilated. As a result, the temperature rise in the equipment room 8 is suppressed, and even when gas fuel is used, for example, the fluctuation of the mixing ratio is at a level where there is no practical problem, and the problem of deterioration in startability does not occur. Moreover, in the present embodiment, the inflow port of the outside air into the equipment chamber is located at a portion requiring cooling, for example, in the vicinity of the cooling water pump 16 and the transmission belt 15, so that efficient cooling can be achieved.

Further, when the opening for communicating the equipment chamber to the outside is provided as described above, noise from the engine, the compressor, etc. leaks to the outside from the opening. On the other hand, in this embodiment, since the air introduction duct has a two-layer structure of the upper layer duct 10 and the lower layer duct 9, the distance from the sound source to the external opening becomes long, the folded portion is formed, and the throttle of the communication port is further formed. Expands in the duct via. This promotes absorption of sound waves and attenuation by reflection. Further, since the external opening 9a of the air introducing duct and the exhaust duct 22 are provided in the portion which is on the back side at the time of installation, as a result of these, the same noise level as when the above-mentioned opening is not provided can be secured.

Further, in this embodiment, the upper and lower ducts 9, 9 are formed by using the lower and upper surfaces of the bottom wall 3 of the equipment chamber 8 in the multi-layered passage.
Since this is realized by configuring 10 and providing the lower duct 9 between the bottom wall 3 and the floor surface, it is possible to prevent an increase in size of the entire apparatus while ensuring a sufficient passage length.

Further, in the present embodiment, since the lower layer duct 9 is provided between the leg portions 3a, 3a of the bottom wall 3, it is possible to prevent the device 1 from tipping over due to a lift operation error during transportation by a forklift. That is, since the lower layer duct 9 is located between the leg portions 3a, 3a, one of the lift pawls 3b is connected to the leg portions 3a, 3a.
There is no mistaken insertion between them, and it is inevitably inserted on both outsides of the leg portions 3a, so a stable lift is possible.

Further, since the engine cooling water can be supplied to the refrigerant heat exchanger when the temperature is equal to or lower than the predetermined temperature, and the thermostat valve 18 that can supply the engine cooling water to the outdoor heat exchanger when the temperature is equal to or higher than the predetermined temperature, the exhaust gas heat exchanger and the engine cooling are provided. When the coolant can be heated using the cooling water whose temperature has been raised by the jacket and the cooling water temperature rises abnormally, the radiator chamber 7 is separated from the equipment chamber 8 and the outside air is introduced by the blower fan 7a.
Since the cooling water is sent to the outdoor heat exchanger arranged at, it is possible to reliably prevent abnormal temperature rise of the cooling water and avoid overheating of the cooling water pump 16.

Since the first and second outside air introducing ducts 23 and 24 are arranged by utilizing the bottom space formed by supporting the unit case 2 through the leg portions 3a, the outside space is effectively utilized by using the dead space. It can be arranged and the problem that the height of the device becomes high can be avoided by providing the outside air introduction duct.

First and second start end openings 9 of the first and second outside air introduction ducts 23 and 24
The opening areas of the a, 9a and the first and second terminal opening portions 25a, 26a are set to be smaller than the passage area of the outside air introducing duct, and
Since the throttles (communication ports) 23a, 24a are provided in the middle of the second outside air introducing duct, the first and second introducing ducts function as expansion chambers, and external leakage of engine sound and the like in the equipment room can be suppressed.

The cooling water pump 16 and the transmission belt 15 are located at the separated positions of the equipment chamber, and the end openings 25a and 26a of the first and second outside air introduction ducts are located near the cooling water pump 16 and the transmission belt 15, respectively. Further, since the exhaust fan 21 is arranged above the equipment chamber 8, the air from the first and second outside air introduction ducts hits the equipment such as the cooling water pump 16 and the transmission belt 15 which require cooling, and Since the air can be efficiently cooled and the air enters the device room 8 through the first and second terminal openings 25a and 26a which are separated from each other in the device room, the air flow from the lower part of the device room to the upper part of the device room 8 in a wide range. Can be formed, and the equipment room 8 can be reliably ventilated.

Further, since the blower fan 27 is provided in the vicinity of the first terminal opening 25a and the guide duct 25b for flowing the air toward the cooling water pump 16 is provided, a large amount of air reliably hits the cooling water pump 16 and the cooling water is The pump 16 can be cooled more reliably.

〔The invention's effect〕

As described above, according to the equipment room ventilation structure of the engine-driven heat pump device according to the present invention, the engine cooling water is provided with the thermostat valve that can supply the refrigerant heat exchanger or the outdoor heat exchanger, so that the engine cooling can be performed. There is an effect that the coolant can be heated by the engine cooling water (warm water) while reliably preventing the abnormal temperature rise of water by the outdoor heat exchanger.

Further, since the outside air introducing duct is arranged by utilizing the bottom space formed by the legs, the outside air introducing duct can be arranged by effectively utilizing the dead space, and the height of the device is increased by providing the outside air introducing duct. Can be avoided and is effective.

Since the throttle is provided in the middle of the outside air introducing duct, the outside air introducing duct can be made to function as an expansion chamber, and there is an effect that the outside leakage of noise in the equipment room can be suppressed.

The cooling water pump and the power transmission belt are located in separate parts of the equipment room, and two external air introduction ducts are provided.
Since the end openings of the first and second outside air introduction ducts are positioned near the cooling water pump and the transmission belt, respectively, it is possible to reliably cool the equipment that requires cooling, and to blow air near the end opening of the first outside air introduction duct. Since the fan and the guide duct for allowing the air to flow toward the cooling water pump are provided, the cooling water pump can be cooled more reliably.

[Brief description of the drawings]

1 to 5 are views for explaining an equipment room ventilation structure according to an embodiment of the present invention. FIG. 1 is a front view thereof, FIG. 2 is a sectional side view thereof, FIG. 3, FIG. 4 and 5 are sectional views taken along the lines III-III and IV-IV of FIG. 1, respectively.
It is a VV line sectional view. In the figure, 1 is an engine-driven heat pump device, 8 is an equipment room, 9 and 10 are lower and upper ducts (air introduction passages), 9a is an outside air introduction opening (starting end opening), 12 is an engine, and 14 is a compressor. , 25a, 26a are equipment chamber openings (end openings).

Claims (1)

(57) [Claims] 1. A unit case having a substantially closed box shape is divided into a radiator chamber and a device chamber by a partition wall, and an outdoor heat exchanger having a blower fan is accommodated and arranged in the radiator chamber, and the engine is installed in the device chamber. An exhaust gas heat exchanger provided in the exhaust system of the engine, a compressor driven by the engine, and engine cooling water are circulated through the outdoor heat exchanger, the exhaust gas heat exchanger, and an engine cooling jacket. In an equipment room ventilation structure of an engine-driven heat pump device accommodating and arranging a cooling water pump, the engine cooling water can be supplied to a refrigerant heat exchanger that heats a refrigerant when the temperature is equal to or lower than a predetermined temperature, and when the temperature is equal to or higher than a predetermined temperature. A thermostat valve capable of supplying to the outdoor heat exchanger is provided in the engine, and the cooling water pump and the engine are provided at separate positions in the equipment chamber. A drive transmission belt for connecting the output shaft of the compressor and the compressor is positioned to support the unit case by the leg portions, and the first case is formed in the space between the bottom surface of the unit case and the arrangement surface formed by the leg portions. The outside air introduction duct and the second outside air introduction duct are arranged in parallel, and the first and second
The first and second outside air introducing ducts are provided so as to be located on the back side at the time of installation, and the first and second outside air introducing ducts are connected to the outside air introducing duct to communicate with the outside air. First and second terminal openings that connect the introduction duct to the equipment chamber are respectively located near the cooling water pump and the power transmission belt, and a blower fan is provided near the first terminal opening and an air flow from the blower fan is provided. Is provided to the cooling water pump, an exhaust port is provided at the upper rear side of the equipment chamber, an exhaust fan is provided at the exhaust port, and an exhaust duct is provided at the back surface of the equipment chamber. An equipment room ventilation structure for an engine-driven heat pump device, characterized in that the above-mentioned discharge port is located at the upper end portion and a ventilation outlet is provided at the lower end portion so as to communicate with the outside air.