JP5305781B2 - Air conditioner exhaust system - Google Patents

Description

  The present invention relates to an exhaust device used in an air conditioner that performs a cooling / heating operation by driving a compressor using a gas engine.

Conventionally, an air conditioner in which an outdoor unit includes a compressor and a gas engine and the compressor is driven by the gas engine is known. This gas engine is for obtaining power by burning gas. When an outdoor unit is installed indoors due to the installation location, an exhaust device for exhausting the exhaust gas after combustion to the outside is required. Become.
As a general exhaust device, there is an exhaust device in which an exhaust duct is connected to the outside of a casing of an outdoor unit to guide exhaust gas to the outdoors (for example, see Patent Document 1).
In addition, when the duct length of the exhaust duct must be increased, an exhaust fan (such as a sirocco fan, a turbo fan, or a line fan) may be installed inside the exhaust duct.
JP 2002-250224 A

  When installing the exhaust fan at a low cost, it is preferable to use a line fan. However, the exhaust gas of the gas engine described above contains a lot of acidic components. If this exhaust gas is sucked by the line fan, the line fan will corrode in a short period of time and the replacement frequency will increase. . On the other hand, although it is conceivable to use a line fan using a material having high corrosion resistance, such a line fan is expensive and poorly available.

  Accordingly, an object of the present invention is to provide an exhaust device for an air conditioner that can be configured at low cost and can reduce the frequency of maintenance.

In order to solve the above-described problems, the present invention is directed to an air in which a heat exchanger and a gas engine that drives a compressor are housed in a housing of an outdoor unit, and heat is exchanged by the heat exchanger at the top of the housing. In the exhaust device of the air conditioner, wherein a blower fan that sucks in and discharges the exhaust gas from the casing to the outside of the casing is connected to an exhaust duct for discharging the exhaust gas of the gas engine to the outside of the casing. Above the blower fan, has an opening disposed to face the blower fan, and includes a nozzle that takes in the blown air discharged from the blower fan and guides it to the exhaust gas flow path of the exhaust duct, by releasing the blowing of the blowing fan along the flow path, characterized by comprising an ejector for sucking the exhaust gas negative pressure is generated in said exhaust duct.
According to this configuration, there is no need to provide a part that may corrode in a portion that comes into contact with the exhaust gas.

Further, the ejector may be disposed at a bent portion of the exhaust duct.
According to this structure, it becomes easy to install an ejector in an exhaust duct.

Furthermore, the ejector may be attached in the vicinity of the exhaust port of the exhaust duct.
According to this configuration, the negative pressure can be effectively generated by the ejector.

Further, it is possible to provide control means for controlling the rotational speed of the line fan or the blower fan in a manner proportional to the increase / decrease of the rotational speed of the engine.
According to this configuration, the exhaust gas generated substantially in proportion to the engine speed can be efficiently discharged from the outdoor unit.

  The present invention includes a line fan at a position avoiding the exhaust gas flow path in the exhaust duct, and a nozzle for guiding the air sent from the line fan to the flow path, along the flow path. By supplying air, an ejector that sucks the exhaust gas by generating a negative pressure in the exhaust duct is provided, so that the exhaust gas and the line fan are not in contact with each other, and the line fan is corroded. The fear can be prevented. As a result, it is not necessary to use an expensive line fan having corrosion resistance, and the exhaust device can be configured at a low cost. Further, since the line fan does not corrode in a short period of time, maintenance frequency such as replacement of the line fan is reduced, and the maintainability is improved.

  Further, the present invention includes a nozzle that guides the air blown by the blower fan to a flow path of the exhaust gas in the exhaust duct, and discharges the blown air of the blower fan along the flow path, thereby Since the ejector that generates the negative pressure and sucks the exhaust gas is provided, it is not necessary to provide a blower such as a line fan in a portion where the exhaust gas contacts. Therefore, it is not necessary to provide a part that may be corroded in a portion in contact with the exhaust gas, and maintenance such as replacement of the line fan becomes unnecessary. Moreover, since a line fan is unnecessary, the cost of the exhaust device itself can be further reduced.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram of a refrigerant circuit in an outdoor unit 100 used in a gas heat pump (GHP) type air conditioner according to a first embodiment of the present invention. In this circuit diagram, the refrigerant circuit is indicated by a solid line, and the cooling water circuit is indicated by a solid thick line.
Here, GHP means what drives a compressor with a gas engine.

  A refrigerant circuit 110 in the outdoor unit 100 shown in FIG. 1 includes a gas engine 1, a compressor 3 connected to the gas engine 1 by a V-belt 2, and a counterclockwise order from the compressor 3 via a refrigerant pipe. The accumulator includes an oil separator 4 to be connected, a four-way valve 5, an outdoor heat exchanger 6 that is cooled by air sucked by fans 17 and 17, a motor-operated valve 7, a plate heat exchanging unit 36, and an accumulator 11. 11 is connected to the compressor 3 so that the refrigerant circulates. Further, an indoor unit (not shown) is provided on the left side of FIG. 1, and a refrigerant pipe is connected to the indoor unit via an on-off valve 9, 10.

Further, in FIG. 1, an arrow indicated by a solid line indicates the flow of the refrigerant in the case of the refrigeration cycle, and an arrow indicated by a dotted line indicates the flow of the refrigerant in the case of the heating cycle. Can be switched.
As shown in FIG. 1, the refrigerant circuit 110 includes a bypass valve 12 that is an electric valve, a liquid valve 13 that is an electric valve, a pressure switch 14, a pressure sensor 15 on a high pressure side, a pressure sensor 16 on a low pressure side, A check valve 18 and a subcooler 19 are provided.

  On the other hand, the cooling water circuit 120 in the outdoor unit 100 includes a hot water three-way valve 37 (also referred to as an electric cooler three-way valve), a cooling water three-way valve 20 and a radiator 39 which are sequentially connected from the gas engine 1 via a cooling water pipe. And an electric valve 40, a reservoir tank 22, and a cooling water pump 21. The cooling water pump 21 is connected to the exhaust gas heat exchanger 23 of the gas engine 1 so that the cooling water circulates. . An exhaust muffler 24 is connected to the exhaust gas heat exchanger 23, and an exhaust top 25 and a drain filter 26 are connected to the exhaust muffler 24.

  Further, as shown in FIG. 1, the gas engine 1 includes combustion gas cutoff valves 27 and 27, a zero governor 28, a fuel adjustment valve 29 that is an electric valve, an air cleaner 30, a stepping motor 31, and an oil level switch 33. A sub oil pan 32, an oil pump 34, and an oil catcher 35 are connected to each other. By opening / closing the combustion gas cutoff valve 27 and the movement of the stepping motor 31, gas as fuel is supplied to the gas engine 1.

  In the cooling water circuit 120, an arrow indicated by a thick solid line in FIG. 1 indicates a flow of the cooling water in the case of the refrigeration cycle. In the case of this refrigeration cycle, the cooling water flowing out from the gas engine 1 flows to the hot water three-way valve 37 and the cooling water three-way valve 20, and further flows to the radiator 39 to cool the cooling water. Then, it passes through the electric valve 40 and is drawn back to the cooling water pump 21.

  Moreover, the arrow shown with the thick dotted line in FIG. 1 has shown the flow of the cooling water in the case of a heating cycle. In the case of this heating cycle, a flow rate of 90% or more of the cooling water flowing out from the gas engine 1 is drawn back to the cooling water pump 21 from the hot water three-way valve 37.

FIG. 2 is a perspective view of the outdoor unit 100 as viewed from the upper right side.
The outdoor unit 100 has a substantially rectangular parallelepiped casing, and the casing has a two-stage configuration in the vertical direction. That is, the upper side of the casing is configured as a heat exchange chamber 50 and the lower side is configured as a machine chamber 52.

  The outdoor heat exchanger 6 is attached to the heat exchange chamber 50 so as to be exposed to the outside of the heat exchange chamber 50. Two fans 17, 17 are arranged inside the outdoor heat exchanger 6, and the fans 17, 17 are attached so as to be exposed from the upper surface of the heat exchange chamber 50. Thereby, the outside air W1 taken into the inside from the outside of the outdoor unit 100 by the fans 17 and 17 passes through the outdoor heat exchanger 6 and the exhaust air W2 is discharged upward of the outdoor unit 100. become.

  In the machine room 52, the gas engine 1 and the compressor 3 are arranged. The gas engine 1 is provided with the exhaust muffler 24 described above. As shown in FIG. 2, the exhaust muffler 24 extends to the upper surface 100a of the outdoor unit 100, and is connected to a connection port 54 provided on the upper surface 100a.

  FIG. 3 is a plan view of the outdoor unit 100 as viewed from above, and is a schematic view showing a state where the ejector 70 is attached. FIG. 4 is an enlarged cross-sectional view showing a portion of the ejector 70 shown in FIG.

  The exhaust device 200 is attached to the connection port 54 of the outdoor unit 100 described above. As shown in FIG. 3, the exhaust device 200 includes an exhaust duct 60 attached to the connection port 54, an extension exhaust duct 61 for extending the exhaust duct 60, and the exhaust ducts 60, 61 at substantially right angles. And an ejector 70 for generating a negative pressure at the connecting portion. Further, the exhaust top 25 described above is provided at the tip of the exhaust duct 61. The exhaust ducts 60 and 61 and the ejector 70 are attached in such a manner that they are suspended from the ceiling inside the room.

  One end of the exhaust duct 60 is connected to the connection port 54, and the exhaust gas W <b> 5 flowing upward through the inside of the exhaust muffler 24 (see FIG. 2) flows to the exhaust duct 60 through the connection port 54. The exhaust duct 60 is formed in such a manner that it is bent in the lateral direction after being routed upward from the connection port 54. As shown in FIG. 4, the other end of the exhaust duct 60 is connected to an ejector 70, and the exhaust gas W <b> 5 flows from the exhaust duct 60 to the exhaust duct 61 through the ejector 70.

As shown in FIG. 4, the ejector 70 includes a line fan 71, a nozzle 72 that houses the line fan 71, and an elbow part 73 into which the tip of the nozzle 72 enters and connects the exhaust ducts 60 and 61. It is configured.
The line fan 71 is a general fan in which the extending direction of a rotating shaft (not shown) coincides with the air flow direction, and is rotated by being connected to a power supply wiring (not shown).
The nozzle 72 is formed in a substantially cylindrical shape having openings 71 a and 71 b at both ends of the line fan 71 in the air flow direction. This one opening 71a is located outside the elbow part 73, and takes in the air W3 by the line fan 71 from the outside of the ejector 70. The other opening 71 b is located inside the elbow part 73. The opening 71b is narrowed at the tip 72a of the nozzle 72 so as to be smaller than the opening 71a, so that the flow rate of the air W4 discharged from the opening 71b is faster than the flow rate of the air W3. It has become.

  The elbow part 73 is formed in a substantially rectangular parallelepiped shape. As shown in FIG. 4, the exhaust duct 61 is connected in such a manner that the flow path of the exhaust duct 61 (the direction in which the exhaust gas flows) and the discharge direction of the air W <b> 4 from the ejector 70 are the same. Further, the exhaust duct 60 is connected in a manner that is substantially orthogonal to the flow path of the exhaust duct 61, and the elbow portion 73 is configured to bend the exhaust ducts 60 and 61 (bent portion). Further, as shown in FIG. 4, the line fan 71 is located outside the elbow part 73, and from the exhaust gas flow path in the exhaust duct constituted by the exhaust ducts 60, 61 and the elbow part 73. Is also arranged outside (position avoiding the flow path).

  Thus, when the air W4 is blown out by the ejector 70, a flow of the air W4 having a high flow velocity is generated in the elbow part 73 and the exhaust duct 61, and a negative pressure is generated in the vicinity of this flow. Exhaust gas W5 from the exhaust duct 60 is sucked into the negative pressure portion, and exhaust of the exhaust gas W5 is promoted.

  According to the exhaust device of the air conditioner according to the first embodiment of the present invention, the line is provided at a position avoiding the flow path of the exhaust gas W5 in the exhaust duct constituted by the exhaust ducts 60 and 61 and the elbow part 73. An exhaust duct that includes a fan 71 and a nozzle 72 that guides air from the line fan 71 to the flow path and sends the air along the flow path, which is downstream of the flow path of the exhaust gas W4. Since the ejector 70 for generating the negative pressure in 61 to suck the exhaust gas W5 is provided, the exhaust gas W5 does not hit the line fan 71, and the line fan 71 does not corrode in a short period of time. Therefore, even when the duct length of the exhaust duct is long and it is necessary to install an exhaust fan for promoting exhaust, it is not necessary to use an expensive line fan having corrosion resistance, and at a low cost. The exhaust device 200 can be configured. Further, since the line fan 71 does not corrode in a short period of time, maintenance frequency such as replacement of the line fan 71 is reduced, and the maintainability is improved.

  Further, since the ejector 70 is disposed at the bent portion where the exhaust ducts 60 and 61 are substantially orthogonal, the line fan 71 of the ejector 70 can be disposed on the opposite side of the exhaust duct 61. Therefore, the ejector 70 can be easily installed between the exhaust ducts 60 and 61 while the line fan 71 is disposed at a position avoiding the exhaust gas W5 flow path of the exhaust ducts 60 and 61 and the elbow part 73. .

The best mode for carrying out the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .
In the first embodiment, the ejector 70 is disposed at a connection portion (bent portion) that connects the exhaust ducts 60 and 61 in a substantially orthogonal manner, but the ejector 70 is disposed even if it is not a portion that connects the two ducts. can do. For example, the nozzle 72 of the ejector 70 may be inserted into the exhaust duct and the air W4 may be discharged directly into the duct.

Moreover, since it is preferable to attach the ejector 70 at a position where negative pressure is likely to be generated, the ejector 70 may be disposed near the exhaust port of the exhaust device 200. That is, since the exhaust gas W5 is diffused and discharged from the exhaust port to the atmosphere side, the flow rate of the exhaust gas W5 increases. Since the negative pressure is more likely to be generated when the flow rate of the exhaust gas W5 is faster, the negative pressure can be efficiently generated by attaching the ejector 70 to the exhaust port.
Since the exhaust port is located outdoors, the upper end of the exhaust duct extending upward is bent downward and directed downward. The above-mentioned “near the exhaust port” refers to a range from the exhaust port to a bent portion bent to direct the exhaust port downward.

  Furthermore, the inner diameter of the exhaust duct 61 may be larger than the inner diameter of the exhaust duct 60 in order to easily generate a negative pressure.

  Further, in the present embodiment, the exhaust ducts 60 and 61 are connected as a bent portion in a substantially orthogonal manner, but the ejector 70 can be easily attached even at an angle of about 45 degrees, for example. That is, any angle may be used as long as the flow path of the exhaust duct 61 can coincide with the discharge direction of the air W4 of the ejector 70 and a space for attaching the ejector 70 to the opposite side of the exhaust duct 61 can be secured.

  Furthermore, an increase / decrease in the rotational speed of the gas engine 1 may be detected, and the rotational speed of the line fan 71 may be controlled in proportion to the increase / decrease in the rotational speed. For example, as shown in FIG. 4, a rotation speed sensor (not shown) for detecting the rotation speed of the gas engine 1 and a line fan 71 are connected via a control device 80 (control means). The line fan 71 can freely change the rotation speed by inverter control, and the control device 80 controls the rotation speed of the line fan 71 based on the signal of the rotation speed sensor described above. The control device 80 may be accommodated in the outdoor unit 100 or may be disposed in the vicinity of the attachment position of the ejector 70. According to this, since the line fan 71 can be rotationally driven in accordance with the amount of exhaust gas W5 exhausted substantially in proportion to the rotational speed of the gas engine 1, the line fan 71 can be rotated more than necessary. Therefore, the probability of equipment failure can be reduced. Further, energy saving operation can be performed.

  On the other hand, instead of the fine fan 71, naturally, an exhaust fan such as a sirocco fan or a turbo fan can be applied.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a schematic view of an ejector portion according to the second embodiment of the present invention. In the exhaust device 400 (ejector) in the second embodiment, the exhaust air W2 exhausted by the fan 17 is used instead of the air blow W4 of the ejector 70 in the first embodiment by the line fan 71. Therefore, the description of the same configuration as that of the first embodiment is omitted.

  The ejector 400 in the second embodiment includes an air supply port 370. As shown in FIG. 5, the air supply port 370 includes a nozzle 372 formed in a substantially L shape to guide the exhaust air W <b> 2 flowing in the vertical direction to the exhaust duct 361 extending in the horizontal direction. The opening 371a on the fan 17 side of the nozzle 372 is disposed so as to face the fan 17, and is expanded in a trumpet shape to collect the exhaust air W2. Further, the discharge side of the nozzle 372 has a narrowed tip 372a so that the flow rate of the air W6 discharged from the opening 371b is faster than the flow rate of the exhaust air W2.

  In addition, the ejector 400 in 2nd Embodiment is comprised in the aspect which does not provide the elbow part 73 like 1st Embodiment as an example. Therefore, the exhaust duct 60 is attached so as to be directly fitted into the exhaust duct 361 as shown in FIG. Moreover, the front-end | tip part 372a of the nozzle 372 is attached in the aspect inserted in the inside of the exhaust duct 361, as shown in FIG. Of course, it is also possible to configure in such a manner that the elbow part 73 is provided as in the first embodiment.

  Similarly to the first embodiment, the exhaust duct 60 is positioned adjacent to the fan 17 and extends upward from the connection port 54 on the upper surface 100a (see FIG. 2). An ejector 400 is attached to the upper end of the exhaust duct 60. As a result, the ejector 400 is arranged above the fan 17, and the exhaust air W <b> 2 of the fan 17 is easily collected through the opening 371 a.

  Furthermore, the exhaust ducts 60 and 361 are connected so as to be substantially orthogonal, as in the first embodiment, and the ejector 400 is provided at the bent portion. Further, as shown in FIG. 5, a reduced diameter member 380 for reducing the inner diameter of the exhaust duct 361 is provided in the exhaust duct 361 on the downstream side of the nozzle opening 371b and in the vicinity of the opening 371b. It has been. The diameter-reducing member 380 is for making it easy for a negative pressure to be generated by the air W6 released by the ejector 400.

  Thus, when the air W6 is blown out by the ejector 400, a flow of the air W6 having a high flow velocity is generated in the exhaust duct 361, and a negative pressure is generated in the vicinity of this flow. Exhaust gas W5 from the exhaust duct 60 is sucked into the negative pressure portion, and exhaust of the exhaust gas W5 is promoted.

  According to the exhaust device of the air conditioner according to the second embodiment of the present invention, the exhaust air W2 discharged from the fans 17 and 17 is taken in, and the discharge air W6 of the ejector 400 is generated using the exhaust air W2. Therefore, it is not necessary to provide the line fan 71 in the first embodiment. As a result, problems such as corrosion of the line fan 71 can be solved, and maintenance is not required because the line fan 71 is not used. Further, the manufacturing cost can be reduced by the amount that the line fan 71 is not provided.

  Further, since the ejector 400 is disposed at a bent portion where the exhaust ducts 60 and 361 are substantially orthogonal to each other, the trumpet-shaped opening 371a of the ejector 400 can be disposed on the opposite side of the exhaust duct 361. Therefore, the ejector 400 can be easily installed based on the positional relationship between the exhaust ducts 60 and 361 and the fan 17.

The best mode for carrying out the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .
In the first embodiment, as shown by a one-dot chain line in FIG. 2, a suction port and a heat exchanger (not shown) are provided also on the side surface of the heat exchange chamber 50 of the outdoor unit 100, and the fan 17 is further connected to 1 It is also possible to increase the capacity by adding more (three in total). In the second embodiment, particularly when the outdoor unit 100 (see FIG. 2) is installed in a veranda of a high-rise building such as a condominium in the city center and exhaust gas from the outdoor unit 100 is to be forcibly discharged, the duct 61 The exhaust gas can be efficiently discharged even if the length of the gas becomes longer. Therefore, the exhaust gas can be discharged more efficiently by adding the fan 17 and the like.

  Further, in the second embodiment, the exhaust ducts 60 and 361 are connected as bent portions in a substantially orthogonal manner, but the ejector 400 can be easily attached even at an angle of about 45 degrees, for example. That is, any angle may be used as long as the flow path of the exhaust duct 361 can coincide with the discharge direction of the air W6 of the ejector 400 and a space for mounting the ejector 400 on the opposite side of the exhaust duct 361 can be secured.

  Furthermore, an increase / decrease in the rotation speed of the gas engine 1 may be detected, and the rotation speed of the drive motor 17a of the fan 17 may be controlled so as to be proportional to the increase / decrease in the rotation speed. For example, as shown in FIG. 5, a rotational speed sensor (not shown) for detecting the rotational speed of the gas engine 1 and a drive motor 17a are connected via a control device 380 (control means). The drive motor 17a can freely change the rotation speed by inverter control, and the control device 380 controls the rotation speed of the drive motor 17a based on the signal of the rotation speed sensor described above. The control device 380 may be accommodated in the outdoor unit 100, or may be disposed in the vicinity of the attachment position of the ejector 400. According to this, since the fan 17 can be rotationally driven in accordance with the amount of exhaust gas W5 exhausted substantially in proportion to the rotational speed of the gas engine 1, the fan 17 is not rotated more than necessary. The probability that the equipment will fail can be reduced. Further, energy saving operation can be performed.

It is a schematic diagram of the refrigerant circuit in the outdoor unit which concerns on 1st Embodiment of this invention. It is a perspective view of an outdoor unit. It is a top view of an outdoor unit. It is an expanded sectional view of the part of the ejector of FIG. It is a schematic diagram of the ejector part which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas engine 2 V belt 3 Compressor 6 Outdoor heat exchanger 17 Fan 17a Drive motor 24 Exhaust muffler 25 Exhaust top 50 Heat exchange chamber 52 Machine room 54 Connection port 60, 61, 361 Exhaust duct 70, 370 Ejector 71 Line fan 71a , 71b, 371a, 371b Opening 72, 372 Nozzle 72a Tip 73 Elbow 80, 380 Control device (control means)
100 Outdoor unit 100a Upper surface 110 Refrigerant circuit 120 Cooling water circuit 200, 400 Exhaust device 380 Reduced diameter member W1 Outside air W2 Exhaust air W3, W4, W6 Air W5 Exhaust gas

Claims (4)

A heat exchanger and a gas engine that drives the compressor are housed in a casing of the outdoor unit, and a blower fan that sucks the air heat-exchanged by the heat exchanger and discharges it to the outside of the casing at the top of the casing. In an exhaust device of an air conditioner, wherein an exhaust duct for exhausting the exhaust gas of the gas engine to the outside of the housing is connected to an outer portion of the housing,
Above the blower fan, has an opening disposed to face the blower fan, and includes a nozzle that takes in the blown air discharged from the blower fan and guides it to the exhaust gas flow path of the exhaust duct, by releasing the blowing of the blowing fan along the flow path, an exhaust system of an air conditioning apparatus is characterized by providing an ejector for sucking the exhaust gas negative pressure is generated in said exhaust duct. The exhaust device for an air conditioner according to claim 1, wherein the ejector is disposed at a bent portion of the exhaust duct. The exhaust device for an air conditioner according to claim 1 or 2 , wherein the ejector is attached in the vicinity of an exhaust port of the exhaust duct. The air according to any one of claims 1 to 3 , further comprising control means for controlling the rotational speed of the line fan or the blower fan in proportion to an increase or decrease in the rotational speed of the engine. The exhaust device of the harmony device.

Images