JP2006291810A - Intake air silencer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter integrated intake air silencer having simple construction. <P>SOLUTION: The inlet air silencer is connected to an air intake of an engine for silencing the intake noises of air sucked into the engine. It comprises a first pipe having one end as an air scoop, a silencing chamber communicated with the other end of the first pipe, a second pipe having one end communicated with the silencing chamber, a filter chamber communicated with the other end of the second pipe, and a clean chamber communicated with the filter chamber via a filter. The silencing chamber, the filter chamber and the clean chamber are formed in one unit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a silencer (silencer), and more particularly to an intake silencer that is connected to an intake port of an engine and silences an intake sound of outside air.

  GHP (gas heat pump) is a kind of air conditioner, and performs air conditioning using a gas engine. Specifically, the compressor (compressor) connected to the refrigerant passage by the gas engine is driven to circulate the refrigerant in the refrigerant passage, and the indoor heat exchanger and the outdoor heat exchanger interposed in the refrigerant passage Thus, the refrigerant is condensed and evaporated, and the air is conditioned by the movement of heat associated with the action.

  In such a GHP, when the gas engine takes in air taken from outside, intake noise is generated. In order to prevent this intake noise, an intake silencer is often installed on the intake side of the gas engine. In addition, if foreign matter is mixed in the air supplied to the gas engine, the intake efficiency is impaired. Therefore, a filter (air cleaner) is often attached to the intake side of the gas engine.

  Conventionally, an intake silencer and a filter are separately provided on the intake side of a gas engine, and a configuration in which these are connected by a hose or the like has been employed. Therefore, it is necessary to connect each unit (silencer unit, filter unit), and there is a problem in terms of space and cost due to the fact that each unit is configured separately.

In order to solve the above-described problem, the air intake silencer described in Patent Document 1 shows an air cleaner device in which a sound deadening chamber is integrally provided.
JP 2001-041123 A

  However, the air cleaner device described in Patent Document 1 has a structure in which a side branch is provided from the intake flow path, and realizes silencing by a resonance effect by such a branch. For this reason, there exists a problem that the shape of the housing will become very complicated because the intake flow path branches into a plurality due to the presence of the branch. In addition, when this type of device is manufactured, there is a problem that the flow rate of outside air to be introduced cannot be changed. In particular, GHP gas engines with various outputs are used depending on the application, and the amount of outside air to be sucked in varies depending on the output. It is necessary to use a dedicated intake silencer every time or to separately provide a flow rate adjusting means in the intake passage. For this reason, there was a problem of further cost increase.

 Therefore, it is a technical object of the present invention to solve the above problems.

The invention of claim 1 devised to solve the technical problem is:
In the intake silencer that is connected to the intake port of the engine and silences the intake sound of the air that is drawn into the engine,
A first pipe having one end as an air intake port, a silencer chamber communicated with the other end of the first pipe, a second pipe communicated with the other end of the first pipe, and a second pipe communicated with the other end of the second pipe An intake silencer comprising: a filter chamber; and a clean chamber communicating with the filter chamber via a filter, wherein the silencer chamber, the filter chamber, and the clean chamber are integrally formed. That is.

Further, the invention of claim 2 taken in order to solve the technical problem,
A filter chamber is defined in the interior, and a filter chamber forming wall portion in which a filter mounting opening and a muffled air introduction hole penetrating from the inside to the outside are formed, and extending from the filter chamber forming wall portion and introducing outside air A base member integrally formed with an outside air intake wall portion in which a hole is formed;
The filter chamber forming wall and the outside air inlet wall are fixed so as to cover the silencer air introduction hole and the outside air introduction hole, and a silencer chamber is formed in an internal space covering the silencer air introduction hole and the outside air introduction hole. A muffler cover member for forming a compartment;
A clean chamber is formed in an internal space that is fixed to the filter chamber forming wall so as to cover the filter mounting hole and covers the filter mounting opening, and an exhaust port that communicates the internal space with an intake port of the engine. A formed filter cover member;
A first pipe that is inserted into the outside air introduction hole and introduces outside air into the muffler chamber;
A second pipe inserted through the silencer air introduction hole and communicating the silencer chamber and the filter chamber;
A filter attached to the filter mounting opening;
An intake silencer is provided.

The invention of claim 3 is the invention of claim 2,
After the base member is molded, a desired number of the filter mounting openings are formed in the base member by post-processing.

The invention of claim 4 is the invention according to any one of claims 2 and 3,
At least one of the first pipe and the second pipe is configured to be replaced with a desired inner diameter or a desired shape.

 According to the present invention, in the intake silencer in which the filter and the silencer are integrated, a silencing chamber is provided, and a method of silencing by inflating the intake air in the silencing chamber is adopted. Therefore, it is necessary to provide a side branch or the like. Without it, the structure can be simplified.

 Further, since the silencer chamber and the filter chamber are connected by a pipe (silenced air introduction pipe), the amount of intake air can be adjusted by changing the diameter of the pipe. Therefore, even for engines with different outputs, the same intake silencer can be applied by changing only the diameter and shape of the pipe, so there is no need to prepare a dedicated intake silencer for each engine. Can be suppressed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

 FIG. 1 is a front view of the intake silencer in this example, and FIG. 2 is a longitudinal sectional view in FIG. In the figure, the outer surface of the intake silencer 100 in this example is constituted by a base member 10, a muffler cover member 20, and a filter cover member 30.

 The base member 10, the muffler cover member 20, and the filter cover member 30 are each made of resin, the base member 10 can be molded by blow molding, and the muffler cover member 20 and the filter cover member 30 can be molded by injection molding.

 As shown in FIG. 2, the base member 10 is formed to have a filter chamber forming wall portion 12, an outside air intake wall portion 13, a first bracket portion 14, and a second bracket portion 15.

 The filter chamber forming wall portion 12 is formed at the position facing the bottom surface portion 12a while continuing to the bottom surface portion 12a, the side surface portion 12b extending from the periphery of the bottom surface portion 12a, and the side surface portion 12b. It has an opening surface portion 12c and is formed in a bag shape so that the filter chamber 11 is formed in a region surrounded by these surface portions. Further, a filter mounting opening 16 and a muffled air introduction hole 17 are formed in the opening surface portion 12c. The filter mounting opening 16 is formed so as to have a recess having the same shape as the cross-sectional shape of the filter described later. The silencing air introduction hole 17 is formed so as to have a recess having the same shape as the outer shape of the second pipe described later.

 Further, two filter mounting openings 16 formed in the opening surface portion 12c can be formed as shown by a dotted line in FIG. 1, but only one of them may be formed. In manufacturing, when the base member 10 is formed by blow molding, the filter mounting opening 16 is not formed. Then, after blow molding, a desired number (one or two in this example) of filter mounting openings 16 are formed in the base member 10 by post-processing. As described above, the number of the filter mounting openings 16 to be formed by post-processing can be selected, so that a common base member having a different number of filter mountings can be manufactured.

 As shown in FIG. 2, an outside air intake wall portion 13 is connected to a joining side between the side surface portion 12 b on the lower side in the drawing and the opening surface portion 12 c among the side surface portions 12 b of the filter chamber forming wall portion 12. The outside air intake wall portion 13 has a flat plate shape, is flush with a portion of the opening surface portion 12c formed by the silenced air introduction hole 17, and is formed with an outside air introduction hole 18.

 A first bracket portion 14 is formed continuously on the outside air intake wall portion 13. Further, the second bracket portion 15 is continuously formed on the side surface portion 12b on the upper side in the drawing of the side surface portion 12b of the filter chamber forming wall portion 12. These bracket portions 14 and 15 are formed so as to extend toward the bottom surface portion 12 a side of the filter chamber forming wall portion 12. Moreover, both brackets 14 and 15 are bent so that the front end portions thereof are along the housing 200 of the outdoor unit of the GHP, and the front end portions are attached to the housing 200 by fastening means such as bolts (not shown). In addition, when the intake silencer 100 of this example is attached to the housing 200, it is attached so that the air introduction port 201 formed in the housing 200 and the outside air introduction hole 18 formed in the outside air intake wall portion 13 face each other. As a result of such attachment, as shown in the figure, a space surrounded by the side surface portion 12b of the filter chamber forming wall portion 12, the outside air intake wall portion 13, the first bracket 14 and the housing 200 is formed. The outside air intake space 51 is used.

 As shown in FIG. 2, the silencer cover portion 20 is formed in a cup shape with one surface opened, and the opening edge is formed in a flange shape. And it attaches to base member 10 in the state where this cup shape was thinned. At this time, the filter chamber is formed so that the silencer cover portion 20 covers both the outside air introduction hole 18 formed in the outside air intake wall portion 13 and the silence air introduction hole 17 formed in the opening surface portion 12a of the filter chamber forming wall portion 12. It is attached to the opening surface part 12 c of the wall part 12 and the outer surface of the outside air intake wall part 13. Then, the silencer cover portion 20 is fixed to these wall portions by hermetically welding the flange-like portions to the opening surface portion 12c and the outside air intake wall portion 13 (vibration welding, hot plate welding, etc.). By fixing the silencing cover portion 20 in this way, the internal space of the silencing cover portion 20 is partitioned as the silencing chamber 21, and the outside air intake space 51 and the silencing chamber 21 communicate with each other via the outside air introduction hole 18. In addition, the muffler chamber 21 and the filter chamber 11 communicate with each other through the muffler air introduction hole 17.

 The filter cover portion 30 is formed in a cup shape with one surface opened similarly to the sound deadening cover portion 20, and the opening edge is formed in a flange shape. And it attaches to the base member 10 in the state which thinned this cup shape. At this time, the filter cover portion 30 is attached to the opening surface portion 12 c of the filter chamber forming wall portion 12 so as to cover the filter attachment opening 16 formed in the opening surface portion 12 c of the filter chamber forming wall portion 12. Further, as can be seen from the figure, the filter cover 30 is formed with a discharge port 32 at the bottom of the cup shape. The discharge port 32 communicates with an intake side of an engine (not shown).

 A filter 41 is attached to the filter attachment opening 16 of the filter chamber forming wall 12. As can be seen from the figure, the filter 41 is provided with a filter part 41a and a grip part 41b formed on the outer periphery of the filter part 41a, and the filter part 41a removes dust and the like mixed in the outside air. Is done. Further, the grip portion 41b is formed of an elastic body. The filter chamber forming wall 12 is fastened by a fastening means such as a screw in a state where the gripping portion 41b is sandwiched between the opening surface portion 12c of the filter chamber forming wall 12 and the flange-shaped portion of the filter cover portion 30, and the filter cover is attached to the filter chamber forming wall portion 11 The part 30 is fixed. By fixing the filter cover portion 30 in this way, the internal space of the filter cover portion 30 is partitioned as a clean chamber 31, and the filter 41 is interposed between the filter cover portion 30 and the filter chamber forming wall portion 12. It is pinched and fixed.

 Further, the first pipe 42 is inserted into the outside air introduction hole 18. Further, the second pipe 43 is inserted into the silence air introduction hole 17. Accordingly, the outside air in the outside air intake space 51 enters the silencer chamber 21 through the first pipe 42, and the air in the silencer chamber 21 enters the filter chamber 11 through the second pipe 43.

 In the intake silencer 100 having the above-described configuration, when an engine (not shown) is driven, negative pressure is applied to the intake side so that outside air is sucked into the intake side of the engine. In response to this negative pressure, air is taken into the intake silencer 100 from the outside. The air to be taken in first enters the outside air intake space 51 through the air inlet 201 formed in the housing 200 of the outdoor unit. Then, the sound enters the silencer chamber 21 from the outside air intake space 51 through the first pipe 42. When the outside air is discharged from the first pipe 42 to the muffler chamber 21, the space is expanded and muffled.

 The outside air silenced in the silencer chamber 21 enters the filter chamber 11 through the second pipe 43. When the outside air is discharged from the second pipe 43 to the filter chamber 11, the sound is silenced by the expansion of the space. The outside air enters the clean chamber 31 from the filter chamber 11, but since the filter 41 is interposed between the filter chamber 11 and the clean chamber 31, the outside air is cleaned by the filter 41 and then cleaned. Enter the chamber 31. Then, the air is drawn into the intake side of the engine from the clean chamber 31 through the discharge port.

 The intake silencer 100 of the present example silences and cleans the outside air as described above. At this time, by changing the shape and the inner diameter of the first pipe 42 or the second pipe 43, the outside air sucked in The amount can be adjusted. For this reason, when the intake silencer 100 of the present example is applied to an engine with different output, only the specifications of the first pipe and / or the second pipe are changed, and common parts can be used for other parts. It can be an intake silencer. For example, an engine with an output of 20 hp requires more outside air than an engine with an output of 10 hp. In such a case, the first pipe 42 is based on the engine with an output of 20 hp. When the inner diameter of the second pipe 43 is set and the intake silencer is applied to an engine with an output of 10 horsepower, the first pipe 42 has the same outer diameter and a smaller inner diameter. The inner diameter is the same, and the intake end is reduced by narrowing the inlet end or the outlet end of the pipe, so that an intake silencer that supplies an intake amount corresponding to an engine with an output of 10 horsepower can be obtained. Moreover, the same means may be given to the 2nd pipe 42, and you may devise so that such an effect | action may be implement | achieved by both pipes.

 Furthermore, when producing the base member 10, the intake silencer 100 of this example first produces the base member 10 by blow molding in a state where the filter attachment opening 16 is not formed, and then attaches a desired number of filters. The opening 16 can be formed by post-processing. For this reason, when the intake silencer 100 of the present example is applied to an engine with different outputs, it is possible to cope with engines with various outputs only by changing the number of filter mounting openings 16 to be formed and the number of filters fitted therein. Therefore, the intake silencer can be made versatile. For example, when manufacturing an intake silencer to be applied to an engine with an output of 10 horsepower, only one filter mounting opening 16 is formed by post-processing on a base member manufactured by blow molding, and the filter mounting opening 16 thus formed is formed. Only one filter needs to be fitted. On the other hand, when manufacturing an intake silencer to be applied to an engine with an output of 20 horsepower, two filter mounting openings 16 are formed by post-processing on a base member made by blow molding. Two filters may be inserted into the two filter mounting openings 16 formed. In this way, the common base member 10 can be applied to engines having different outputs.

It is a front view of an intake silencer in an embodiment of the present invention. It is sectional drawing of the intake silencer shown in FIG.

Explanation of symbols

10: base member, 11: filter chamber, 12: filter chamber forming wall portion, 13: outside air intake wall portion, 14: first bracket portion, 15: second bracket portion, 16: filter mounting opening, 17: silence air Introduction hole 18, Outside air introduction hole 20: Silencer cover member 21: Silencer chamber 30: Filter cover member 31: Clean chamber 32: Exhaust port 41: Filter 42: First pipe 43: Second pipe , 100: intake silencer, 200: housing

Claims (4)

In the intake silencer that is connected to the intake port of the engine and silences the intake sound of the air that is drawn into the engine,
A first pipe having one end as an air intake port, a silencer chamber communicated with the other end of the first pipe, a second pipe communicated with the other end of the first pipe, and a second pipe communicated with the other end of the second pipe An intake silencer comprising: a filter chamber; and a clean chamber communicating with the filter chamber via a filter, wherein the silencer chamber, the filter chamber, and the clean chamber are integrally formed. A filter chamber is defined in the interior, and a filter chamber forming wall portion in which a filter mounting opening and a muffled air introduction hole penetrating from the inside to the outside are formed, and extending from the filter chamber forming wall portion and introducing outside air A base member integrally formed with an outside air intake wall portion in which a hole is formed;
The filter chamber forming wall and the outside air inlet wall are fixed so as to cover the silencer air introduction hole and the outside air introduction hole, and a silencer chamber is formed in an internal space covering the silencer air introduction hole and the outside air introduction hole. A muffler cover member for forming a compartment;
A clean chamber is formed in an internal space that is fixed to the filter chamber forming wall so as to cover the filter mounting hole and covers the filter mounting opening, and an exhaust port that communicates the internal space with an intake port of the engine. A formed filter cover member;
A first pipe that is inserted into the outside air introduction hole and introduces outside air into the muffler chamber;
A second pipe inserted through the silencer air introduction hole and communicating the silencer chamber and the filter chamber;
A filter attached to the filter mounting opening;
An intake silencer characterized by comprising: In claim 2,
The intake silencer according to claim 1, wherein a desired number of the filter mounting openings are formed in the base member by post-processing after the base member is molded. In any one of Claim 2 or 3,
An intake silencer, wherein at least one of the first pipe and the second pipe is configured to be replaced with a desired inner diameter or a desired shape.

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