JP2003113712A - Outdoor unit for engine-driven air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit for an engine-driven air conditioner that prevents transmission of a vibration of an engine to an exhaust gas heat exchanger, is inexpensive, is easy to assemble, is sufficiently reliable and is safe owing to non-exposure of a high temperature part. SOLUTION: The outdoor unit for an engine-driven air conditioner comprises the water-cooled engine 1 for driving a compressor 11, the exhaust gas heat exchanger 2 for cooling exhaust gas of the engine 1, a coolant circulating pump 17 for circulating coolant Y, and an exhaust gas flow through pipe 20 interposed between the engine 1 and the exhaust gas heat exchanger 2 to lead the exhaust gas of the engine 1 to the exhaust gas heat exchanger 2. The exhaust gas flow through pipe 20 comprises a flexible tube 21.

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 air conditioner having a compressor driven by a water-cooled engine.

[0002]

2. Description of the Related Art Conventionally, for example, an outdoor unit 10 of a water-cooled engine-driven air conditioner has a machine room 12 and a heat exchange room 15 above the machine room 12, as shown in FIG. In the machine room 12, a compressor 11, an engine 1 that drives the compressor 11, a tubular exhaust gas heat exchanger 2 that is closed at both ends to lower the temperature of exhaust gas from the engine 1,
A cooling liquid circulation pump 17 that circulates a cooling liquid that cools the engine 1 and the like is mounted, and a hydrocarbon fuel such as gas and petroleum is burned by the engine 1 that is a driving force source. For this reason,
When the fuel burns in the engine 1, high-temperature exhaust gas is generated, and since the outdoor unit 10 is generally installed near a building, the exhaust gas is released into the atmosphere after its temperature is lowered.

In order to lower the temperature of the exhaust gas as quickly as possible, the engine 1 is provided with an exhaust gas heat exchanger 2 in the vicinity thereof in substantially parallel to the floor. This exhaust gas heat exchanger 2 has a cylindrical exhaust gas flow pipe 18 on the side circumferential surface.
Has one end welded, and the other end of the exhaust gas flow pipe 18 is provided with a flange (not shown). The flange (not shown) is fixed to the engine 1 with a bolt (not shown) to allow the exhaust gas to flow. Is configured as follows. The exhaust gas that has passed through the exhaust gas heat exchanger 2 is exhausted from the first exhaust pipe 3 and the exhaust muffler 4.
And passes through the second exhaust pipe 5 and is discharged from the exhaust port 8 into the atmosphere.

Here, in the exhaust gas heat exchanger 2, it is necessary to increase the heat exchange area in order to improve the heat exchange performance with the exhaust gas. Therefore, the exhaust gas heat exchanger 2 is upsized. . And, the fixing of this large-sized exhaust gas heat exchanger 2 is performed by a plurality of dedicated fixing tools (A, B, C, D, E, F).
And a flange portion (not shown) are attached to the outer shell of the engine 1. Therefore, in order to prevent breakage or cracks in the welded portion of the exhaust gas flow pipe 18 due to the vibration of the engine 1, dedicated fixtures (A, B, C, D, E,
F) requires a high-strength fixture, so that the cost is high, the assembling work is complicated, and the reliability is not sufficient.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, prevents the vibration of the engine from being transmitted to the exhaust gas heat exchanger, is low in cost, and is assembled. It is an object of the present invention to provide an outdoor unit for an engine-driven air conditioner that is easy to work, has sufficient reliability, and has no exposed high temperature part and is safe.

[0006]

In order to achieve the above object, the present invention provides a water-cooled engine for driving a compressor and an exhaust gas for cooling the exhaust gas of the engine. Exhaust gas flow pipe, which is interposed between the heat exchanger, a coolant circulation pump for circulating a coolant, and the engine and the exhaust gas heat exchanger, and which guides exhaust gas of the engine to the exhaust gas heat exchanger. And the exhaust gas flow pipe is a flexible pipe.

According to a second aspect of the invention, in the outdoor unit of the engine-driven air conditioner according to the first aspect, the exhaust gas heat exchanger is installed in a vertical direction.

According to a third aspect of the present invention, a water-cooled engine for driving a compressor, an exhaust gas heat exchanger for cooling exhaust gas of the engine, and a cooling liquid circulation pump for circulating a cooling liquid are provided. An exhaust gas flow pipe that is interposed between the engine and the exhaust gas heat exchanger and that guides the exhaust gas of the engine to the exhaust gas heat exchanger, and the exhaust gas flow pipe is a flexible pipe, and A liquid chamber to which a cooling liquid is supplied is provided on the outer circumference of the exhaust gas flow pipe.

According to a fourth aspect of the present invention, in the outdoor unit of the engine-driven air conditioner according to the third aspect, the liquid chamber has an exhaust gas flow pipe and an outer pipe that covers the outer periphery of the exhaust gas flow pipe. It is characterized in that the cooling liquid is circulated between these two pipes.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) An embodiment of the present invention will be described in detail below with reference to the drawings. Note that FIG.
The same components as those of the above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numeral 10 denotes an outdoor unit of an engine-driven air conditioner. In the lower part of the outdoor unit 10, an engine 1, an exhaust gas heat exchanger 2, and the exhaust gas heat exchanger 2 are cylindrical with both end surfaces closed, and a flange portion (not shown) is formed on a part of the upper surface. And a plurality of legs 2A supporting the exhaust gas heat exchanger 2 are provided in the lower part, and are installed substantially vertically to the floor.

The exhaust gas flow pipe 20 for guiding the exhaust gas from the engine 1 to the exhaust gas heat exchanger 2, the compressor 11 driven by the engine 1, the cooling liquid circulation pump 17 for circulating the cooling liquid, etc. are housed. A machine room 12
An outdoor blower 13 and an outdoor heat exchanger 1 are provided on the machine room 12.
A heat exchange chamber 15 accommodating 4 and 4 is provided. The outdoor heat exchanger 14 constitutes a part of the refrigeration cycle together with the compressor 11.

Exhaust gas of the engine 1 includes an engine 1, an exhaust gas flow pipe 20, an exhaust gas heat exchanger 2, a first exhaust pipe 3,
It is guided to the exhaust top 8 provided above the heat exchange chamber 15 via the exhaust muffler 4 and the second exhaust pipe 5. Further, the drain generated in the exhaust muffler 4, the second exhaust pipe 5 and the exhaust top 8 is dropped and discharged to the outside through the drain pipe 6. Reference numeral 16 is a freezing prevention heater provided near the drain filter 7.

Further, the engine 1 has an exhaust gas flow pipe 2
0, the exhaust gas heat exchanger 2, the first exhaust pipe 3, the exhaust muffler 4, the second exhaust pipe 5 and the exhaust top 8 are sequentially connected, and the exhaust gas exhausted from the engine 1 through these is discharged to the outside. Is discharged.

Next, the exhaust gas flow pipe 20 will be described in detail with reference to FIG.

As shown in FIG. 2, the exhaust gas flow pipe 20 has a length for connecting the engine 1 and the exhaust gas heat exchanger 2 of about 300 to 400 mm, and substantially the entire heat-resistant stainless steel tube has a bellows-shaped bellows portion. Approximately 30-40mm diameter molded into 21A
A flexible pipe 21 and an engine side flange EF provided at one end of the flexible pipe 21 on the engine 1 side,
It is configured with an exhaust gas heat exchanger side flange HF provided on the exhaust gas heat exchanger 2 side at the other end of the flexible pipe 21. Plural holes N through which bolts (not shown) penetrate are formed in the flanges EF and HF at both ends.

The engine side flange EF is fixed to the engine 1 by passing a bolt (not shown) through the hole N, and the exhaust gas heat exchanger side flange HF is also passed through a hole (not shown) by the hole N through the exhaust gas heat. The engine 1 is fixed to a flange portion (not shown) provided on the upper surface of the exchanger 2.
The exhaust gas from is introduced into the exhaust gas heat exchanger 2.

The exhaust gas introduced into the exhaust gas heat exchanger 2 is heat-exchanged inside the exhaust gas heat exchanger 2, the temperature of the exhaust gas is lowered, and the exhaust gas is sent to the downstream first exhaust pipe 3.

The base end of the first exhaust pipe 3 is connected to the exhaust gas heat exchanger 2, and the end thereof is connected to the exhaust muffler 4. The exhaust gas that has passed through the first exhaust pipe 3 and is guided to the exhaust muffler 4 is silenced by the exhaust muffler 4 and sent to the second exhaust pipe 5.

The second exhaust pipe 5 is arranged in the heat exchange chamber 15, and has an upper end connected to the exhaust top 8 and a lower end connected to the exhaust muffler 4. At the lower end of the second exhaust pipe 5, 10
Since exhaust gas at around 0 ° C. flows in and passes through, a material that can withstand this heat and has high chemical resistance, for example, a heat-resistant or chemical-resistant rubber tube is used. When the exhaust gas passes through the second exhaust pipe 5, the second exhaust pipe 5 is cooled by the outside air flowing into the heat exchange chamber 15 and the heat of the exhaust gas is reduced, so that the moisture in the exhaust gas is condensed. Drain water is generated.

Further, 28 is a drain recovery pipe, the upper end of this drain recovery pipe 28 is connected to a drain port (not shown) of the bottom plate of the exhaust top 8, and the lower end is connected to the drain pipe 6 for communication. . Then, the drain water generated in the exhaust top 8 is discharged through the drain recovery pipe 28.

In the outdoor unit 10 configured as described above, the engine 1 is operated when the outdoor unit 10 is operating, and the compressor 11 is driven by the engine 1 to circulate the refrigerant in the refrigeration cycle. The exhaust gas of the engine 1 is exhaust gas flow pipe 20, exhaust gas heat exchanger 2, first exhaust pipe 3,
It is discharged from the exhaust top 8 through the exhaust muffler 4 and the second exhaust pipe 5.

At this time, the exhaust gas heat exchanger 2 and the engine 1 are connected to each other such that the exhaust gas heat exchanger 2 is installed substantially perpendicular to the floor and the flanges EF and HF provided at both ends of the flexible pipe 21. Are fixed to the exhaust gas heat exchanger 2 side and the engine 1 side by bolts (not shown). Therefore, the vibration of the engine 1 is almost absorbed by the bellows portion 21A, and a large vibration is not transmitted to the exhaust gas heat exchanger 2. Therefore, the welded portion is hardly cracked or damaged.

Since the above-described first embodiment is configured as described above, it is possible to prevent the vibration of the engine from being transmitted to the exhaust gas heat exchanger, which is low in cost, easy to assemble, and reliable. It is also possible to obtain sufficient sex.

(Second Embodiment) Next, a second embodiment of the present invention.
3 will be described with reference to FIGS. 3 to 4. The same components as those in the first embodiment will be designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, FIG. 3 to FIG.
As shown in, the diameter covering the outer periphery of the bellows portion 21A of the exhaust gas flow pipe 20 is about 100 to 120 mm, and the wall thickness is 3 to 5 m.
The outer tube 32 is a rubber hose having a heat resistance, pressure resistance, and weather resistance of m, and lids F1 and F2 that close both sides of the outer tube 32. Part of the lids F1 and F2 has a diameter L of about 8 to 10 mm. Character-shaped pipes P1 and P2 are provided, and a liquid chamber T in which the cooling liquid Y circulates is formed between the exhaust gas flow pipe 20 and the outer pipe 32 of the rubber hose. I am configuring.

The pipe P1 is connected to the cooling liquid inflow pipe Pin from the outdoor heat exchanger 14, the pipe P2 is connected to the cooling liquid outflow pipe Pout, and the exhaust gas flow pipe 20 and the rubber hose outer pipe 32 are connected to each other. The cooling liquid Y is circulated in the liquid chamber T between them by the cooling liquid circulation pump 17.

The temperature of the exhaust gas passing through the inside of the exhaust gas flow pipe 20 is about 500 to 550 ° C., and the temperature of the bellows portion 21A is lowered by the cooling liquid Y. At this time, the outer tube 32
Since the temperature of the outer peripheral wall is about 90 to 100 ° C,
The heat resistance of No. 2 is sufficient to withstand this.

In the outdoor unit 10 configured as described above, the engine 1 is operated when the outdoor unit 10 is operating, and the compressor 11 is driven by the engine 1 to circulate the refrigerant in the refrigeration cycle. Then, the exhaust gas of the engine 1 passes through an exhaust gas flow pipe assembly 30, an exhaust gas heat exchanger 2, a first exhaust pipe 3, an exhaust muffler 4 and a second exhaust pipe 5, and an exhaust top 8
Is discharged from the outside.

At this time, the exhaust gas heat exchanger 2 and the engine 1 are connected to each other by the exhaust gas heat exchanger 2 installed substantially perpendicular to the floor, and the flanges EF and HF provided at both ends of the flexible pipe 21. Are fixed to the exhaust gas heat exchanger 2 side and the engine 1 side by bolts (not shown). Therefore, the vibration of the engine 1 is almost absorbed by the bellows portion 21A, and a large vibration is not transmitted to the exhaust gas heat exchanger 2. Therefore, the welded portion is hardly cracked or damaged.

Furthermore, the exhaust gas flow pipe assembly 30 is
Heat resistance covering the outer periphery of the bellows portion 21A of the exhaust gas flow pipe 20,
It is composed of an outer tube 32 of a pressure-proof rubber hose and lids F1 and F2 that close both sides of the outer tube 32. Pipes P1 and P2 are provided in a part of the lids F1 and F2, and these exhaust gas flow tubes 20 A liquid chamber T in which the cooling liquid Y circulates is formed between the rubber hose and the outer pipe 32, and constitutes an exhaust gas flow pipe assembly 30.

A cooling liquid circulating pump 17 circulates the cooling liquid Y in the liquid chamber T between the exhaust gas flow pipe 20 and the outer pipe 32 of the rubber hose.

The temperature of the exhaust gas passing through the inside of the exhaust gas flow pipe 20 is about 500 to 550 ° C., and the temperature of the exhaust gas flow pipe assembly 30 is lowered by the cooling liquid Y. At this time, since the temperature of the outer peripheral wall of the outer tube 32 is about 90 to 100 ° C., the heat resistance of the outer tube 32 is sufficiently high.

In the outdoor unit 10 configured as described above, the engine 1 is operated when the outdoor unit 10 is operating, and the compressor 11 is driven by the engine 1 to circulate the refrigerant in the refrigeration cycle. Then, the exhaust gas of the engine 1 passes through an exhaust gas flow pipe assembly 30, an exhaust gas heat exchanger 2, a first exhaust pipe 3, an exhaust muffler 4 and a second exhaust pipe 5, and an exhaust top 8
Is discharged from the outside.

At this time, the exhaust gas heat exchanger 2 and the engine 1 are connected by connecting the flanges EF and HF provided at both ends of the flexible pipe 21 to the exhaust gas heat exchanger 2 side and the engine 1 side by bolts (see FIG. (Not shown) is fixed and connected and fixed.
Therefore, the vibration of the engine 1 is almost absorbed by the bellows portion 21A, and a large vibration is not transmitted to the exhaust gas heat exchanger 2. Therefore, the welded portion is hardly cracked or damaged.

Furthermore, the exhaust gas flow pipe assembly 30 is
Heat resistance covering the outer periphery of the bellows portion 21A of the exhaust gas flow pipe 20,
Outer tube 32 of a rubber hose having pressure resistance and weather resistance, and this outer tube 32
And lids F1 and F2 that close both sides of the
Pipes P1 and P2 are provided in a part of the exhaust gas flow pipe 20, and a liquid chamber T in which the cooling liquid Y circulates is formed between the exhaust gas flow pipe 20 and the outer pipe 32 of the rubber hose. The cooling liquid Y is circulated in the liquid chamber T between the rubber hose and the outer pipe 32 of the rubber hose by the cooling liquid circulation pump 17, so that the high temperature portion is not directly exposed and is safe during service or inspection. is there.

Since the second embodiment described above is constructed as described above, it is possible to prevent the vibration of the engine from being transmitted to the exhaust gas heat exchanger, the cost is low, the assembling work is simple, and the reliability is high. It is possible to obtain sufficient safety and high safety because the high temperature part is not directly exposed.

Although the present invention has been described based on the two embodiments, the present invention is not limited to this.

[0039]

As described above, according to the present invention as set forth in claim 1, a water-cooled engine for driving a compressor, an exhaust gas heat exchanger for cooling the exhaust gas of the engine, and a cooling A cooling liquid circulation pump for circulating a liquid; and an exhaust gas flow pipe that is interposed between the engine and the exhaust gas heat exchanger and that guides exhaust gas of the engine to the exhaust gas heat exchanger. Since the gas flow pipe is made of a flexible pipe, it is possible to prevent the vibration of the engine from being transmitted to the exhaust gas heat exchanger.

According to the present invention as defined in claim 2,
Since the exhaust gas heat exchanger is installed vertically,
The cost is low, the assembly work is easy, and the reliability is sufficient.

Further, according to the present invention as set forth in claims 3 to 4, a water-cooled engine for driving the compressor, an exhaust gas heat exchanger for cooling the exhaust gas of the engine, and a coolant are circulated. A cooling liquid circulation pump, and an exhaust gas flow pipe that is interposed between the engine and the exhaust gas heat exchanger and that guides the exhaust gas of the engine to the exhaust gas heat exchanger,
The exhaust gas flow pipe is configured with a flexible pipe, and
Since the liquid chamber to which the cooling liquid is supplied is provided on the outer circumference of the exhaust gas flow pipe, the vibration of the engine is prevented from being transmitted to the exhaust gas heat exchanger, the cost is low, and the assembly work is easy. It is simple and reliable, and it is safe because the high temperature part is not exposed.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of an outdoor unit of an engine-driven air conditioner showing a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view of an exhaust gas flow pipe showing the first embodiment of the present invention.

FIG. 3 is a schematic configuration explanatory diagram of an outdoor unit of an engine-driven air conditioner showing a second embodiment of the present invention.

FIG. 4 is a schematic explanatory view of an exhaust gas flow pipe assembly showing a second embodiment of the present invention.

FIG. 5 is a schematic configuration explanatory view showing an outdoor unit of a conventional engine-driven air conditioner.

[Explanation of symbols]

1 engine 2 Exhaust gas heat exchanger 10 Engine driven air conditioner outdoor unit 11 compressor 17 Coolant circulation pump 20 Exhaust gas distribution pipe 21 flexible tube 21A bellows 30 Exhaust gas distribution pipe assembly 32 outer tube T chamber Y cooling liquid

Claims (4)

[Claims] 1. A water-cooled engine for driving a compressor,
The exhaust gas heat exchanger for cooling the exhaust gas of the engine, the cooling liquid circulation pump for circulating the cooling liquid, and the exhaust gas heat exchanger mounted between the engine and the exhaust gas heat exchanger An outdoor unit for an engine-driven air conditioner, comprising: an exhaust gas flow pipe leading to a gas heat exchanger, wherein the exhaust gas flow pipe is a flexible pipe. 2. The outdoor unit of an engine-driven air conditioner according to claim 1, wherein the exhaust gas heat exchanger is installed in a vertical direction. 3. A water-cooled engine for driving a compressor,
The exhaust gas heat exchanger for cooling the exhaust gas of the engine, the cooling liquid circulation pump for circulating the cooling liquid, and the exhaust gas heat exchanger mounted between the engine and the exhaust gas heat exchanger An exhaust gas flow pipe leading to a gas heat exchanger, wherein the exhaust gas flow pipe is a flexible pipe, and
An outdoor unit for an engine-driven air conditioner, characterized in that a liquid chamber to which a cooling liquid is supplied is provided on the outer circumference of the exhaust gas flow pipe. 4. The liquid chamber comprises an exhaust gas flow pipe and an outer pipe covering the outer periphery of the exhaust gas flow pipe, and a cooling liquid is circulated between the both pipes. The outdoor unit of the engine-driven air conditioner according to [1].