JP2511497Y2 - Waste heat recovery type exhaust muffler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a waste heat recovery type exhaust muffler having a heat exchange function of recovering exhaust heat discarded in an engine to heat a liquid.

<Prior Art> Generally, an exhaust muffler is provided in an exhaust passage of an engine to muffle engine exhaust sound.

Conventional exhaust mufflers generally only have a muffling function, and exhaust heat is usually discarded.
There are also known ones, such as the techniques disclosed in JP-A-56-85515 and JP-A-63-112121, in which exhaust heat is recovered and the recovered heat is effectively used for heating a vehicle or the like. There is.

In the former conventional example, a hot water boiler is used as a heat recovery device and is attached to the silencer body itself.

In the latter conventional example, the heat absorbing portion of the heat pipe whose heat radiating portion is arranged at a required heating portion such as a heating unit is arranged in the exhaust muffler body.

<Problems to be Solved by the Invention> However, each of the conventional exhaust heat recovery devices has the following problems.

That is, in the former one, since the hot water boiler, which is a device different from the exhaust muffler, is provided, the shape of the exhaust muffler body does not change, but the weight is heavy, and the existing exhaust muffler body is unchanged. It cannot be used and is disadvantageous in terms of cost.

The latter uses an expensive device called a heat pipe, which is disadvantageous in cost and is not practical.

Further, as a technique for effectively utilizing the exhaust heat, there is known a structure in which a heat exchanger for guiding the exhaust from the exhaust pipe on the upstream side of the exhaust muffler and exchanging heat between the exhaust and the liquid is configured around the exhaust pipe. (See Subaru Technical Report, 1986, No. 14, p. 52) However, in this one, since a heat exchanger having a large and complicated exhaust passage and a liquid passage is built around the exhaust pipe, it is upsized. Since it causes an increase in weight, an increase in cost, and the like, and the mounting size of the exhaust system is changed, it has drawbacks such as difficulty in retrofitting to an existing vehicle, and is not practical.

Therefore, in view of the above conventional problems, the present invention has
There is no problem of changing the shape of the exhaust muffler body, weight increase, cost etc., it can be easily applied to the existing exhaust muffler body,
It is an object of the present invention to provide a practical waste recovery type exhaust muffler that can be easily retrofitted to a vehicle or the like.

<Means for Solving the Problems> Therefore, the waste heat recovery type waste muffler of the present invention is an exhaust muffler interposed in the exhaust passage of the engine, and has two expansion chambers formed by partitioning in the muffler body. An inlet pipe having one end opened to the outside and connected to the exhaust passage, passing through one expansion chamber, the other end opening into the other expansion chamber, and one end opened into the other expansion chamber, An exhaust flow pipe having an outlet pipe having the other end opened to the outside and connected to an exhaust passage is provided, and the inside of the inlet pipe is partitioned into a side communicating with the exhaust passage and a side communicating with the other expansion chamber. At the same time, a large number of through holes are formed in the outer peripheral wall of the inlet pipe located on the inner side of the one expansion chamber, and the through holes are arranged on the outer peripheral portion of the inlet pipe on the inner side of the one expansion chamber to exchange heat with exhaust heat. The liquid flow passage through which the liquid A heat exchanger composed of the above is provided.

<Operation> In this configuration, the exhaust gas flowing through the exhaust muffler is
The explosion noise is silenced by the principles of sequential expansion, sound wave resonance, interference, and absorption.

On the other hand, the liquid is heated by exchanging heat with the exhaust heat while flowing through the liquid flow passage.

In the above configuration, the heat of the exhaust gas that has been conventionally discarded is recovered and is effectively used as the heat source for heating the liquid. Therefore, the hot water for the heating system for the vehicle, the hot water used for the shower, etc. It is possible to obtain hot water for accelerating engine warm-up without using a separate heating device, simplify the facility, reduce energy consumption, and be economically advantageous.

Further, according to such a configuration, the heat exchanger is provided which is arranged on the outer peripheral portion of one of the inlet pipes on the inner side of the expansion chamber and which is configured by the liquid flow passage through which the liquid that exchanges heat with the exhaust heat flows. By the integrated structure of the exhaust flow pipe and the heat exchanger, the shape of the exhaust muffler body does not change at all.
It does not add weight. Further, the existing exhaust muffler body can be used almost as it is, which is advantageous in terms of cost.

Further, there is no need to use an expensive device called a conventional heat pipe, which is advantageous in terms of cost and is practical.

Further, as described above, since the heat exchanger is incorporated in the exhaust muffler, the size around the exhaust pipe does not become large, downsizing, weight reduction, cost reduction, etc. can be achieved, and the exhaust system mounting dimensions can also be increased. Since it does not need to be changed, there is an advantage that retrofitting to an existing vehicle can be easily performed.

Further, since heat is exchanged within the exhaust muffler body, heat does not escape to the outside, and heat exchangability is excellent.

In particular, in such a configuration, the heat exchanger is positioned at a portion where the exhaust gas blows out from the through hole of the inlet pipe into the expansion chamber and a portion where the exhaust gas flows into the through hole from the expansion chamber. Since it is in contact with the outer peripheral surface, the heat exchange efficiency between the exhaust gas and the liquid in the heat exchanger can be increased, and the exhaust heat can be recovered easily.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

Referring to FIG. 1 showing a first embodiment of the present invention, an exhaust muffler 1 installed in an exhaust passage of an engine for a vehicle has a cylindrical muffler main body 2 with both ends closed, and inside the muffler main body 2. It is composed of an inlet pipe 3 as an exhaust flow pipe and an outlet pipe 4 as the exhaust flow pipe, which are provided so as to penetrate through the outside.

The muffler main body 2 includes a tubular member 5 and end wall plates 6A and 6B that are fixedly attached to both ends of the tubular member 5 to close the tubular member 5 and the tubular member 5 substantially in the axial direction of the member 5. It is composed of a partition plate 7 fixed at an intermediate position.

In the muffler body 2, two expansion chambers A and B partitioned by the partition plate 7 are formed.

On the other hand, the inlet pipe 3 includes the end wall plate 6A and the partition plate 7
Most of them are located inside the muffler body 2 and are supported so as to penetrate through the through holes 6a and 7a formed respectively in the and, and one end of the muffler main body 2 is arranged to project outward from the end wall plate 6A by a short length. . A flange portion 3a for connecting to an exhaust pipe (not shown) is formed at the protruding end portion of the inlet pipe 3.

A partition plate 8 is fixed to the inside of the inlet pipe 3 at a substantially intermediate position in the central axis direction of the pipe.
The inside is partitioned into a side communicating with the exhaust pipe and a side communicating with the expansion chamber B. A large number of through holes 9 are formed in the outer peripheral wall of the inlet pipe 3 located inside the expansion chamber A.

The outlet pipe 4 has a through hole 6b formed in the end wall plate 6B.
Most of them are located in the expansion chamber B, and one end portion of the end wall plate 6B is projected to the outside by a short length. A flange portion 4a for connection with an exhaust pipe (not shown) is formed at the protruding end portion of the outlet pipe 4.

Here, a water pipe 10 as a heat exchanger, which is constituted by a liquid flow passage through which a liquid that exchanges heat with exhaust heat flows, is arranged on the outer peripheral portion of the inlet pipe 3 inside the expansion chamber A.

The water pipe 10 is made of a copper pipe and is spirally wound in contact with the outer peripheral surface of the inlet pipe 3. Both ends of the water pipe 10 are led out to the outside from the peripheral wall of the muffler body 2 as a water inlet 11 and a water outlet 12, respectively.

In the above water pipe 10, for example, hot water for a heating system for a vehicle,
Hot water used for showers, etc., hot water for accelerating engine warm-up, etc. are distributed.

 Next, the operation of such a configuration will be described.

Exhaust gas flowing through the exhaust pipe flows into the inlet pipe 3, and first, from the upstream side portion of the partition plate 8 of the inlet pipe 3 to the through hole 9
To the expansion chamber A, and from the expansion chamber A to the downstream side of the partition plate 8 of the inlet pipe 3 again into the inlet pipe 3 through the communication hole 9, and from the inlet pipe 3 to the expansion chamber B. Flow into. The exhaust gas that has flowed into the expansion chamber B flows into the outlet pipe 4 and flows out from the outlet pipe 4 to the exhaust pipe.

The exhaust gas flowing through the exhaust muffler 1 as described above is
The explosion noise is silenced by the principles of sequential expansion, sound wave resonance, interference, and absorption.

Then, the hot water of the heating system, etc., while flowing through the water pipe 10,
It is heated by exchanging heat with exhaust heat.

Exhaust heat of the hot water flowing through the water pipe 10 is thermally conducted through the wall of the inlet pipe 3 and the wall of the water pipe 10, and the exhaust gas flowing out from the through hole 9 and flowing into the through hole 9 directly contacts the water pipe 10. Is exchanged with exhaust heat.

In this case, the flow velocity of the exhaust gas depends on the expansion chamber of the exhaust muffler body 2.
Although it is slow in A and B, the flow velocity when passing through the through hole 9 of the inlet pipe 3 is fast. Therefore, by wrapping the water pipe 10 around the portion where the exhaust gas blows out from the through hole 9 to the expansion chamber A and the portion where the exhaust gas flows into the through hole 9 from the expansion chamber A, the exhaust gas having a high flow velocity can be discharged.
Since it is in contact with the outer peripheral surface, it is possible to increase the efficiency of heat exchange between the exhaust gas and the hot water in the water pipe 10.

 Next, a second embodiment of the present invention is shown in FIG.

In this embodiment, the following configuration is adopted as the heat exchanger arranged on the outer peripheral portion of the inlet pipe 3 inside the expansion chamber A.

That is, in the figure, the heat exchanger 13 includes a pair of left and right annular headers 14 and 15 formed of an annular hollow body, and both annular headers 14 and 15.
It is composed of a plurality of thin tubes (16) that communicate with each other and a plurality of heat transfer fins (17) connected to each thin tube (16).

A water inlet pipe 18 is connected to the peripheral wall of one annular header 15, and a water outlet pipe 19 is connected to the peripheral wall of the other annular header 14. Connected to the inlet pipe 18 and the outlet pipe 19 are connectors 18a and 19a for connecting to a circulation pipe of hot water of a heating system.

The plurality of thin tubes 16 are arranged so as to form an annular shape between the annular headers 14 and 15, and both ends of each thin tube 16 are annular headers 14 and 15.
It is connected to each inner end wall.

The heat transfer fin 17 is composed of an annular plate member and has a plurality of through holes 17a at predetermined intervals along the circumferential direction. The heat transfer fins 17 are connected to the thin tubes 16 by supporting the thin tubes 16 through the through holes 17a.

The heat exchanger 13 is arranged around the inlet pipes 3 so that the inlet pipes 3 pass through the space surrounded by the inner tubes of both annular headers 14 and 15 and the thin tubes 16 annularly arranged. It In this case, the heat transfer fins 17 are brought into contact with the outer peripheral surface of the inlet pipe 3.

In this embodiment, the hot water for the heating system or the like is supplied to the inlet pipe 18
From the annular header 15 to the respective thin pipes 16, flows into the other annular header 14, and flows out from the outlet pipe 19.

As described above, in the hot water flowing through the heat exchanger 13, the exhaust heat is thermally conducted through the wall of the inlet pipe 3, the heat transfer fins 17 and the narrow tubes 16, and flows out from the through holes 9 and the through holes 9. The exhaust gas flowing into the exhaust gas directly contacts the heat transfer fins 17 and the thin tubes 16 to exchange heat with the exhaust heat.

Also in the case of this embodiment, since the heat transfer fins 17 and the thin tubes 16 are located at the portion where the exhaust gas blows from the through hole 9 to the expansion chamber A and the portion where the exhaust gas flows into the through hole 9 from the expansion chamber A, the exhaust gas having a high flow rate is discharged. Is in contact with the heat transfer fin 17 and the outer peripheral surface of the thin tube 16,
It is possible to diversify the heat exchange efficiency between the exhaust gas and the hot water in the thin tube 16.

According to the waste heat recovery type exhaust muffler 1 described above, the heat of exhaust gas that has been conventionally discarded is recovered and is effectively used as a heat source for heating water. Therefore, hot water for a vehicle heating system and a shower are provided. It is possible to obtain hot water to be used for, etc., hot water for accelerating engine warm-up, etc. without using a separate heating device (for example, a combustion burner, etc.), simplifying equipment, reducing energy consumption, and economic. It can be made to be advantageous.

Further, according to this structure, the heat exchanger is provided at the outer peripheral portion inside the muffler main body 2 of the inlet pipe 3 of the exhaust muffler, and is constituted by the water flow passage through which the water that exchanges heat with the exhaust heat flows. Since the muffler body 2 is provided, the shape of the muffler body 2 does not change at all and the weight does not increase due to the integrated structure of the inlet pipe 3 and the heat exchanger.

Furthermore, the existing muffler body 2 can be used almost as it is,
It is also advantageous in terms of cost.

Further, there is no need to use an expensive device called a conventional heat pipe, which is advantageous in terms of cost and is practical.

Further, as described above, since the heat exchanger is incorporated in the exhaust muffler 1, the size around the exhaust pipe does not become large, and it is possible to achieve size reduction, weight reduction, cost reduction, etc. Since it does not need to be changed, there is an advantage that retrofitting to an existing vehicle can be easily performed.

Further, since heat is exchanged in the exhaust muffler main body 2, heat does not escape to the outside, and the heat exchanging property is excellent. Particularly, in such a configuration, as described above, from the through hole 9 of the inlet pipe 3. Since the heat exchanger is located at a portion where the exhaust gas blows into the expansion chamber A and a portion where the exhaust gas flows into the through hole 9 from the expansion chamber A, the exhaust gas having a high flow velocity comes into contact with the outer peripheral surface of the heat exchanger. It is possible to increase the efficiency of heat exchange with the internal water, and there is an advantage that the exhaust heat recovery is excellent.

In the above embodiment, the heat exchanger for exchanging heat with the exhaust heat is configured to obtain hot water for a vehicle heating system, hot water used for a shower or the like, hot water for accelerating engine warm-up, etc. Alternatively, it may be configured to heat other liquids.

<Effects of the Invention> As described above, according to the exhaust heat recovery type exhaust muffler of the present invention, the liquid that is disposed in the outer peripheral portion of the inlet pipe on the inner side of the expansion chamber and through which the liquid that exchanges heat with the exhaust heat flows Since the heat exchanger constituted by the flow passage is provided, the heat of the exhaust gas which has been conventionally discarded can be effectively used, the facility can be simplified and the energy consumption can be reduced, which is economically advantageous.
In addition, the shape of the exhaust muffler body does not change at all, the size and weight can be reduced, the existing exhaust muffler body can be used almost as it is, and it can be easily retrofitted to the existing vehicle. It is excellent in practicality, such as being advantageous in terms of cost, and in particular, heat exchangers are provided at a portion where exhaust gas is blown from the through hole of the inlet pipe to the expansion chamber and a portion where the exhaust gas flows from the expansion chamber to the through hole. Since the high-velocity exhaust gas comes into contact with the outer peripheral surface of the heat exchanger, the heat exchange efficiency between the exhaust gas and the liquid in the heat exchanger can be increased, and the exhaust heat recovery is excellent. ing.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of a waste heat recovery type exhaust muffler according to the present invention, and FIG. 2 is a view showing a second embodiment.
(A) is a front sectional view and (b) is a perspective view of a heat exchanger. 1 ... Exhaust muffler, 2 ... Muffler body, 3 ... Inlet pipe, 4 ... Outlet pipe, 10 ... Water pipe, 11 ... Inlet part, 12
...... Outlet, 13 …… Heat exchanger, 14,15 …… Ring header, 1
6 …… Narrow tube, 17 …… Heat transfer fin, 18 …… Inlet tube, 19 ……
Outlet pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Niimura, 1-chome, Daiji Icho, Ageo City, Saitama Prefecture, Nissan Nissan Diesel Industry Co., Ltd. Incorporated (56) References Actually open 63-112121 (JP, U) Actually open 63-52915 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. An exhaust muffler provided in an exhaust passage of an engine, wherein two expansion chambers are formed as partitions in a muffler body, one end of which is opened to the outside and connected to the exhaust passage, and one of the expansion chambers is expanded. An inlet pipe that passes through the chamber, the other end of which opens into the other expansion chamber, and an outlet pipe whose one end opens into the other expansion chamber and whose other end opens outside and is connected to the exhaust passage. An exhaust flow pipe consisting of, and partitioning the inside of the inlet pipe into a side communicating with the exhaust passage and a side communicating with the other expansion chamber, and on the outer peripheral wall positioned inside the one expansion chamber of the inlet pipe. A large number of through-holes were provided, and a heat exchanger was provided on the outer peripheral portion of the inlet pipe on the inner side of the one expansion chamber and constituted by a liquid flow passage through which a liquid that exchanges heat with exhaust heat flows. Waste heat recovery type exhaust characterized by Muffler.