JPH0556514U - Exhaust heat recovery device - Google Patents

Abstract

(57) [Summary] [Purpose] Not only for indoor heating but also for use in warm-up operation of the engine so that it can be used to broaden its utilization and improve its heat exchange efficiency. In addition, the recovery device can be manufactured at a low cost, and its function can be made safe and reliable for security. [Structure] A plurality of heat transfer bodies are provided inside a hermetically sealed container that encloses a bypass passage and penetrates the hermetically sealed container and the bypass passage. A switching valve provided in the middle of an exhaust pipe with a heat exchanger formed by sealingly superposing an outer container in which an inflow pipe and an outflow pipe connected to a circulation path of engine cooling water are projecting outside the closed container. It is configured to be installed by interposing it in the bypass passage portion extending between the two.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention generally relates to an improvement of an exhaust heat recovery device as a heat source by cooling water for indoor heating of an automobile and for warming up an engine in a winter or cold region.

[0002]

[Prior Art]

 Conventionally, as a recovery device of this type, generally, exhaust heat recovered by a heat pipe provided inside an exhaust pipe is guided to a condenser provided in a duct through which heating air flows and flows through the condenser. It was configured to use the exhaust heat of the engine as a heat source for indoor heating by releasing it into the air.

[0003]

[Problems to be solved by the device]

 However, in such a conventional technique, the exhaust heat is merely used as a heat source for indoor heating, and thus the utilization is poor, and the exhaust heat recovered due to its function is used for heating air. In general, a large number of components are required due to the mechanism for discharging the heat to the device, and the heat recovery efficiency cannot be sufficient for that reason, and the use of the condenser makes the production of the product as the entire recovery device expensive. There was a problem such as.

The present invention has been made in view of the above problems of the prior art, and can be used not only for indoor heating but also for warming up an engine. In addition to increasing the degree of efficiency, the efficiency of heat exchange will be improved to make it more effective, and the cost of the recovery device will be low, and an exhaust heat recovery device that can perform its function safely and securely will be proposed for safety. The purpose is to do.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is provided with a plurality of heat transfer members inside a hermetically sealed container provided in a bypass passage so as to enclose the bypass passage, and through the hermetically sealed container and the bypass passage. A switching valve provided in the middle of the exhaust pipe with a heat exchanger formed by sealingly sealing an outer container in which an inflow pipe and an outflow pipe connected to the engine cooling water circulation passage are provided outside the closed container. The exhaust heat recovery device is configured so as to be installed by interposing it in the bypass passage section that is connected between the heat exchanger and the heat exchanger. A heat insulating layer is formed between the outer container and the frame, and the heat exchanger is formed by mounting a gas detector with its tip positioned between the bypass passage and the closed container. Further, the heat transfer body is formed by a heat pipe.

[0006]

[Action]

 Since the present invention is configured in this way, when operating, the exhaust gas is circulated to the bypass passage side by operating the switching valve, so that the exhaust heat causes the heat transfer body to transfer heat to the engine cooling water directly. As a result, the indoor heating function by circulating the engine cooling water and the warm-up operation after engine start can be performed extremely efficiently, and the cost of the entire recovery system is reduced by eliminating the need for expensive condensers as in the conventional example. It can be manufactured, and if necessary, a gas detector provided can detect an accidental leak of exhaust gas or the like to ensure its function safely and reliably for safety.

[0007]

【Example】

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of an exhaust heat recovery apparatus of the present invention, and FIG. 2 is an enlarged vertical sectional view of the heat exchanger of FIG. Reference numeral (1) is an engine, and an exhaust pipe (2) having a muffler (11) on the tip side is attached to a manifold (1 ') of the engine. (3) is a heat exchanger, which is installed in the middle of the exhaust pipe (2) and interposed in the bypass passage (4) provided between the switching valves (V ₁ ) (V ₂ ). . The heat exchanger (3) is composed of a plurality of heat pipes, etc. that penetrate the sealed container and the bypass passage (4) inside the sealed container (5) that is provided to enclose the bypass passage (4). An outer container (7) equipped with a heat transfer body (8) and further provided with an inflow pipe (6) and an outflow pipe (6 ') connected to the circulation path of the engine cooling water on the outside of the closed container (5). It is formed by polymerizing in a closed state.

Incidentally, (9) is a frame body which surrounds the outer container (7) and is further hermetically sealed if necessary, and a vacuum is provided between the outer container and the frame body (9), etc. The heat insulating layer (11) promotes the heat insulating effect. (10) is a gas detector, and its tip is located between the bypass passage (4) and the closed container (5) to detect the presence or absence of leakage of exhaust gas or engine cooling water. This makes it easier to confirm safety for security.

Further, solid line arrows indicate the flow directions of the exhaust gas and the cooling water as a heat source, respectively.

[0010]

[Effect of the device]

 As described above, the exhaust heat recovery device according to the present invention is particularly suitable for direct engine cooling water by cooling water of the engine, and also by a plurality of heat transfer bodies (8) protruding through the bypass passage (4). Due to the heat transfer of the switching valve (V ₁ ) (V_TwoBy circulating the exhaust gas to the bypass (4) side by the operation of), it can be used for indoor heating and warm-up operation after engine start, and its utilization can be widened and can be performed extremely efficiently. The entire recovery device can be manufactured at low cost, and if necessary, the gas detector (10) can be installed together to detect any leaks of exhaust gas, etc., and ensure its function safely and reliably for safety. It is an extremely useful exhaust heat recovery device that can be used.

[Brief description of drawings]

FIG. 1 is an overall view of an exhaust heat recovery device.

2 is a longitudinal sectional view showing the heat exchanger of FIG. 1 in an enlarged manner. FIG.

[Explanation of symbols]

2 Exhaust pipe 3 Heat exchanger 4 Bypass passage 5 Closed container 6 Inflow pipe 6'Outflow pipe 7 Outer container 8 Heat transfer body 9 Frame body 10 Gas detector 11 Thermal insulation layer V ₁ , V ₂ switching valve

Claims (4)

[Scope of utility model registration request] 1. A plurality of heat transfer members are provided inside a closed container (5) provided in the bypass passage (4) so as to enclose the bypass passage, and penetrate the closed container and the bypass passage (4). The outer container (7), which is equipped with (8) and further has an inflow pipe (6) and an outflow pipe (6 ') connected to the circulation path of the engine cooling water on the outside of the closed container (5), is sealed. The heat exchanger (3) formed by polymerizing the
The exhaust heat recovery device is characterized in that the exhaust heat recovery device is installed by being interposed in the bypass passage (4) portion connected between the switching valves (V ₁ ) (V ₂ ) provided in the middle of the. 2. The heat exchanger according to claim 1,
(3) is characterized in that a frame body (9) which surrounds the outer container (7) and is further sealed is provided, and a heat insulating layer (11) is formed between the outer container and the frame body (9). Exhaust heat recovery device. 3. The heat exchanger according to claim 1,
An exhaust heat recovery device characterized in that (3) is formed by mounting a gas detector (10) with its tip positioned between the bypass passage (4) and the closed container (5). 4. The heat transfer body (8) according to claim 1.
An exhaust heat recovery device, characterized in that it is formed by a heat pipe.