JP4165998B2 - Exhaust system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust device for a combustor or an internal combustion engine, and more particularly to an exhaust muffler structure through which exhaust gas passes.
[0002]
[Prior art]
Conventionally, for example, an engine-driven air conditioner including an exhaust device is known. In this engine-driven air conditioner, a compressor and an engine that drives the compressor are mounted in an outdoor unit, and hydrocarbon fuel such as gas and oil is burned by the engine that is a driving force source. Therefore, when fuel burns in the engine, high-temperature exhaust gas is generated, and since the outdoor unit is generally installed near the building, the exhaust gas is released into the atmosphere at a reduced temperature. . When the temperature of the exhaust gas is lowered, the heat energy of the exhaust gas is recovered using the exhaust heat recovery device.
[0003]
The exhaust gas contains sulfur-based components, depending on the type of fuel, place of production, and combustion conditions, and also generates a large amount of water vapor because it burns hydrocarbon fuel. Part of this large amount of water vapor condenses during heat recovery in the exhaust heat recovery device, and generates condensed water (hereinafter referred to as drain water). Since this drain water contains a sulfur component and exhibits acidity, the drain water is neutralized and discharged using a neutralizer.
[0004]
FIG. 4 is an explanatory view showing an example of a conventional discharge device for discharging exhaust gas and condensed water. In FIG. 4, an exhaust heat recovery device 2 is provided in the engine 1, and a first exhaust pipe 3 is connected to the exhaust heat recovery device 2, and the first exhaust pipe 3 is connected to an exhaust muffler 4. Connected to the exhaust muffler 4 are a second exhaust pipe 5 for discharging exhaust gas and a drain pipe 6 for discharging drain water generated by condensation of moisture in the exhaust gas.
[0005]
In the middle of the drain pipe 6, a drain filter 7 that houses an alkaline neutralizing agent such as calcium carbonate or magnesium carbonate and neutralizes the drain water is provided. The drain filter 7 is provided with a heater 8 so that drain water does not freeze in winter. The outlet of the drain pipe 6 is usually connected to a drainage groove or the like outside the machine.
[0006]
An exhaust port 12 that discharges exhaust gas into the atmosphere is formed at the upper end of the second exhaust pipe 5, and an exhaust top 13 is provided at the exhaust port 12. The exhaust hole 16 is formed. A drain recovery pipe 14 connected to the drain filter 7 is disposed below the exhaust top 13.
[0007]
In the outdoor unit 15 configured as described above, the high-temperature exhaust gas exhausted from the engine 1 is heat-exchanged by the exhaust heat recovery device 2 and the temperature is lowered, and then flows into the exhaust muffler 4, It is discharged from the exhaust top 13 through the exhaust pipe 5. A part of the exhaust gas is condensed in the exhaust muffler 4 and further condensed in the second exhaust pipe 5 to become drain water. This drain water drops and accumulates in the exhaust muffler 4. Also in the exhaust top 13, the exhaust gas is condensed and drain water is generated. These drain waters are led to the drain filter 7 through the drain pipe 6 and the drain recovery pipe 14, neutralized, and then discharged outside the apparatus.
[0008]
[Problems to be solved by the invention]
By the way, since the pressure by the exhaust gas is relatively large in the exhaust muffler 4, a part of the exhaust gas containing a low concentration but harmful component immediately after being discharged from the engine 1 is neutralized through the drain pipe 6. May flow out of the plane without being able to. For this reason, this exhaust gas fills the drainage groove and the like, which may cause deterioration of the surrounding environment, and it is necessary to prevent the exhaust gas from flowing out from the viewpoint of security.
[0009]
In order to prevent this exhaust gas from flowing out, it is conceivable to provide a new device for sealing the exhaust gas in the middle of the drain pipe 6, but if a new water sealing device is provided, the drain system will be closed due to freezing in the winter season. There is a problem that a heat retention device is required to prevent this, resulting in an increase in cost.
[0010]
The present invention eliminates the above-described conventional problems, and includes an exhaust muffler that introduces exhaust gas from a combustor or an internal combustion engine and exhausts the exhaust gas outside, and a drain pipe that discharges drain water from the exhaust muffler. It is an object of the present invention to provide an exhaust device that prevents exhaust gas flowing into the exhaust muffler from flowing out of the machine through a drain pipe.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an exhaust muffler that introduces exhaust gas of a combustor or an internal combustion engine through a first exhaust pipe and exhausts the exhaust gas to the outside through a second exhaust pipe. The exhaust muffler is vertically long and is partitioned into an upper silencing chamber and a lower silencing chamber by a partition plate that is substantially horizontal and provided with a silencing pipe, and the first exhaust is placed in the lower silencing chamber. An upper end is opened with the pipe standing, and the second exhaust pipe is suspended in the upper silencing chamber to open the lower end, and a reservoir for accumulating drain water is provided at the bottom of the lower silencing chamber. The drain pipe for draining the drain water collected in the exhaust muffler is an inverted U-shaped strip having an opening downward in the reservoir, and has a head height that seals the exhaust gas in the lower silencing chamber. The top opening of the first exhaust pipe is the top of the drain pipe Exhaust device being characterized in that is positioned in Rimoue.
[0013]
The invention according to claim 2 is characterized in that the water head height of the drain pipe is a height that allows the exhaust gas to be sealed against the maximum exhaust pressure of the combustor or the internal combustion engine in the exhaust muffler. To do.
[0014]
The invention of claim 3 is characterized in that the drain pipe is attached to the first exhaust pipe.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings of FIGS. The same components as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0016]
In FIG. 1, reference numeral 21 denotes an outdoor unit of an engine-driven air conditioner. A machine room 23 that houses the engine 1, the exhaust heat recovery device 2 of the engine 1, and a compressor 22 that is driven by the engine 1 is provided below the outdoor unit 21. Is provided with a heat exchange chamber 26 in which an outdoor blower 24 and an outdoor heat exchanger 25 are accommodated. The outdoor heat exchanger 25 constitutes a part of the refrigeration cycle together with the compressor 22.
[0017]
An exhaust heat recovery device 2, a first exhaust pipe 3, an exhaust muffler 27, a second exhaust pipe 5 made of a flexible material, and an exhaust top 13 are connected to the engine 1 in this order, and exhaust gas discharged from the engine 1 is exhausted. It is discharged from the exhaust hole 16 of the exhaust top 13.
[0018]
Further, a drain hose 28 and a drain filter 7 are sequentially connected to the exhaust muffler 27, and after the drain generated in the exhaust muffler 27 and the second exhaust pipe 5 drops on the exhaust muffler 27, the drain hose 28 and the drain filter 7 are connected. After that, it is discharged to the outside.
[0019]
Reference numeral 14 denotes a drain recovery pipe. The drain recovery pipe 14 has an upper end connected to the exhaust top 13 and a lower end connected to the drain filter 7. The drain generated at the exhaust top 13 is dropped and discharged to the outside through the drain recovery pipe 14, the drain filter 7, and the drain hose 28. The drain filter 7 is provided with a heater 8 for preventing freezing of drain water.
[0020]
Next, the exhaust muffler 27 of the present invention will be described with reference to FIG. The exhaust muffler 27 is provided in the machine chamber 23 in the vertical direction, and a partition plate 30 is provided at a substantially intermediate position in the exhaust muffler 27, and sound deadening chambers 31 and 33 are formed vertically by the partition plate 30. A silencer pipe 34 that communicates with the upper and lower silencer chambers 31 and 33 of the partition plate 30 is provided in the approximate center of the partition plate 30.
[0021]
In the upper silencing chamber 31, a second exhaust pipe opening 5 a is formed in the upper plate 31 a, and this opening 5 a and a vent (not shown) formed in the bottom plate of the exhaust top 13 are connected by the second exhaust pipe 5. It is connected.
[0022]
A first exhaust pipe 3 and a drain hose 28 are inserted into the lower silencing chamber 33, and a reservoir 35 for drain water generated in the engine 1, the exhaust muffler 27 and the second exhaust pipe 5 is provided.
[0023]
The first exhaust pipe 3 has an opening 3 a that rises upward from a first exhaust pipe hole 33 b formed substantially at the center of the bottom plate 33 a of the lower silencing chamber 33 and opens upward at the tip.
[0024]
The drain hose 28 is inserted into a drain hose hole 33c formed on the side surface of the lower muffler chamber 33, and is bent in an inverted U shape. This curved portion is the uppermost portion 28 a of the entire drain hose 28, and the drain hose 28 opens downward in the lower silencing chamber 33. The height between the inner end opening 28b and the uppermost portion 28a of the drain hose 28 is a water head height H required for sealing the exhaust gas in the lower silencing chamber 33, and the inside of the lower silencing chamber 33 Even when the maximum exhaust pressure of the engine 1 acts on the drain 1 and the drain stored in the exhaust muffler 27 is pushed down, the inner end opening 28b of the drain hose 28 is positioned below the drain level. . The inner end opening 28b and the bottom plate 33a have a minimum gap that allows water to pass therethrough. Thereby, even when the exhaust gas pressure is the highest, the exhaust gas in the lower muffler chamber 33 is sealed with water so that the exhaust gas is not discharged to the outside through the drain hose 28. Further, a part of the drain hose 28 is disposed in contact with the first exhaust pipe 3 in the lower muffler chamber 33.
[0025]
The storage part 35 is provided in the lower silencing chamber 33 and can store drain water from the bottom plate 33 a to the position of the uppermost part 28 a of the drain hose 28.
[0026]
In the engine-driven air conditioner configured as described above, when the outdoor unit 21 is operated, the engine 1 is operated, and the compressor 22 is driven by the engine 1 so that the refrigerant circulates in the refrigeration cycle. The exhaust gas of the engine 1 flows into the exhaust muffler 27 through the exhaust heat recovery device 2. The exhaust gas rises in the exhaust muffler 27 and is discharged from the exhaust top 13 to the outside through the second exhaust pipe 5.
[0027]
On the other hand, the condensed drain water generated when the exhaust gas passes through the exhaust muffler 27 and the second exhaust pipe 5 flows into the lower silencing chamber 33 and is stored in the storage portion 35. When the drain water stored in the storage part 35 reaches the uppermost part 28 a in the drain hose 28, it is gradually pushed out and flows out of the exhaust muffler 27. The drain water that has flowed out of the exhaust muffler 27 passes through the drain filter 7 and is discharged outside the apparatus.
[0028]
Further, the condensed drain water generated when the exhaust gas passes through the exhaust top 13 is discharged from the drain of the bottom plate of the exhaust top 13 through the drain recovery pipe 14 and the drain filter 7 to the outside of the apparatus.
[0029]
According to the above embodiment, the exhaust gas of the engine 1 is exhausted to the outside from the exhaust top 13 through the exhaust heat recovery device 2 and the exhaust muffler 27. At this time, the exhaust gas contains a low concentration but harmful component. The exhaust gas is condensed and dropped in the upper and lower silencing chambers 31 and 33, the second exhaust pipe 5 and the exhaust top 13 of the exhaust muffler 27. Among these, drain water condensed in the upper and lower silencing chambers 31 and 33 of the exhaust muffler 27 and the second exhaust pipe 5 is dripped into the lower silencing chamber 33. This drain water is stored up to the height of the uppermost portion 28a of the drain hose 28 inserted into the exhaust muffler 27, and the exhaust gas is sealed with the stored drain water. Thereby, even when the exhaust gas flowing into the lower silencing chamber 33 has the maximum exhaust pressure, it does not press the water surface and push the water level below the inner end opening 28b of the drain hose 28. Therefore, the drain water stored in the exhaust muffler 27 can prevent the exhaust gas from being discharged to the outside of the apparatus via the drain hose 28, thereby preventing the environment surrounding the outdoor unit 21 from deteriorating.
[0030]
Further, since the drain hose 28 is disposed in contact with the first exhaust pipe 3 through which the high-temperature exhaust gas passes during the outdoor unit 21 operation, the drain water in the drain hose 28 can be prevented from freezing during the winter operation. Can do.
[0031]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this.
[0032]
Further, in an area where there is no risk of winter drain water freezing, the uppermost portion 28a of the drain hose 28 may be provided outside the exhaust muffler 27 as shown in FIG.
[0033]
In the present embodiment, the engine-driven air conditioner is described. However, the present invention can be implemented in another combustor or an internal combustion engine without departing from the gist of the claims.
[0034]
【The invention's effect】
As described above, the exhaust device of the present invention exhausts exhaust gas from the combustor or the internal combustion engine through the exhaust muffler and the second exhaust pipe, and at this time, it is generated by the exhaust muffler and the second exhaust pipe. By storing the drain water in the exhaust muffler and sealing the exhaust muffler with this drain water, it is possible to prevent the exhaust gas from being discharged directly to the outside through the drain pipe of the exhaust muffler. Therefore, the environment around the outdoor unit can be maintained so as not to deteriorate.
[0035]
Further, since the drain hose is disposed in contact with the first exhaust pipe through which the high-temperature exhaust gas passes, it is possible to prevent freezing of drain water accumulated in the drain pipe during the winter operation.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a schematic configuration of an outdoor unit of an engine-driven air conditioner.
FIG. 2 is a longitudinal sectional view of a main part of an exhaust muffler showing an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of a main part of an exhaust muffler showing another embodiment different from FIG. 2;
FIG. 4 is a main part explanatory view showing an example of a conventional exhaust device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Waste heat recovery apparatus 3 1st exhaust pipe 3a 1st exhaust pipe opening part 5 2nd exhaust pipe 5a 2nd exhaust pipe opening part 7 Drain filter 8 Heater 13 Exhaust top 14 Drain recovery pipe 21 Outdoor unit 22 Compression Machine 23 Machine room 24 Outdoor fan 25 Outdoor heat exchanger 26 Heat exchange room 27 Exhaust muffler 28 Drain hose (drain pipe)
28a Top 28b Drain hose inner end opening 30 Partition plate 31 Upper muffler chamber 31a Upper plate 33 Lower muffler chamber 33a Bottom plate 33b First exhaust pipe hole 33c Drain hose hole 35 Reservoir part H Head height

Claims (3)

In an exhaust system including an exhaust muffler that introduces exhaust gas of a combustor or an internal combustion engine through a first exhaust pipe and exhausts the exhaust gas to the outside through a second exhaust pipe, the exhaust muffler is vertically long and has an inside A partition plate, which is substantially horizontal and provided with a silencer pipe, is divided into an upper silencer chamber and a lower silencer chamber. The first exhaust pipe is raised in the lower silencer chamber and an upper end is opened, and the second exhaust is placed in the upper silencer chamber. A pipe is suspended to open the lower end, and a reservoir for storing drain water is provided at the bottom of the lower noise reduction chamber. An inverted U-shaped strip having an opening in the lower part, having a head height that seals the exhaust gas in the lower silencing chamber, and the upper end opening of the first exhaust pipe is above the uppermost part of the drain pipe An exhaust device characterized by being positioned . 2. The exhaust gas according to claim 1, wherein a water head height of the drain pipe is a height that allows the exhaust gas to be sealed against a maximum exhaust pressure of a combustor or an internal combustion engine in the exhaust muffler. apparatus. The exhaust device according to claim 2, wherein the drain pipe is attached to the first exhaust pipe.

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