JP2011106424A - Actuator installing structure of exhaust system heat-exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator installing structure of an exhaust system heat-exchanger capable of protecting an actuator from the heat of the exhaust system by suppressing a temperature rise of the actuator with a refrigerant of the heat-exchanger. <P>SOLUTION: The actuator installing structure of the exhaust gas system heat-exchanger is equipped with heat-exchanger 1 installed in an exhaust gas path to perform heat exchange between the exhaust gas and the refrigerant, a valve 2 to change the proportion of the exhaust gas passing through the heat-exchanger 1, the actuator 3 to control the valve 2, an inlet pipe part 41 to keep the refrigerant flows into the heat-exchanger 1, and a heat conducting plate 51 which is installed at the inlet pipe part 41 and whereto the actuator 3 fixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an actuator arrangement structure used in an exhaust system heat exchanger.

  JP, 2007-239595, A is an arrangement structure of an actuator that drives a valve that is used in an exhaust heat recovery device and switches an exhaust gas flow path to a heat exchanger or a bypass. In the present invention, since the actuator 58 is adjacent to the outside of the exhaust heat recovery heat exchanger 18, the actuator 58 is adjacent to the upstream or downstream portion of the exhaust heat recovery heat exchanger 18 in which only the exhaust gas in the exhaust system flows. Compared with the case, the temperature rise is suppressed and the actuator 58 can be protected from the heat of the exhaust system.

JP2007-239595

  In the case of a structure in which the actuator is arranged adjacent to the outside of the exhaust heat recovery heat exchanger, depending on the position where the actuator is attached, the temperature rise of the actuator is suppressed by the refrigerant heated by the heat of the exhaust gas. The problem that cannot be done arises.

  The present invention has been made in view of such technical problems of the prior art, and an object of the present invention is to suppress an increase in the temperature of the actuator by the refrigerant of the heat exchanger and protect the actuator from the heat of the exhaust system.

  A heat exchanger disposed in the exhaust gas path for exchanging heat between the exhaust gas and the refrigerant, a valve for changing a ratio of the exhaust gas passing through the heat exchanger, and an actuator for controlling the valve; And an inlet pipe portion into which the refrigerant flows into the heat exchanger, and a heat transfer plate attached to the inlet pipe portion and fixing the actuator.

  According to the present invention, an increase in the temperature of the actuator can be suppressed by the refrigerant having a low temperature in the inlet pipe portion before heat exchange is performed by the heat exchanger, and thus there is an effect that the actuator can be protected from the heat of the exhaust system.

Side view of the exhaust heat recovery apparatus of the first embodiment Side view of the heat exchanger of the first embodiment Side view of the heat exchanger of the second embodiment It is a figure which is a 3rd Example and shows the attachment structure of the input pipe part which changed the shape, and a heat exchanger plate, Comprising: (A) is a top view, (B) is a side view. It is a figure which is a 3rd Example and shows the attachment structure of an input pipe part and the heat exchanger plate which changed the shape, Comprising: (A) is a top view, (B) is a side view.

  An actuator arrangement structure for an exhaust gas heat exchanger according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an exhaust heat recovery device. Exhaust gas discharged from an internal combustion engine (not shown) flows into the heat exchanger side passage 9 or the bypass passage 10 by the rotation of the valve 2. The valve 2 is connected to the actuator 3 via a link 7 and a link 8. The actuator 3 is a vacuum type actuator that rotates the valve 2 in response to a command from a control device (not shown). However, the actuator 3 may be one using a motor or a solenoid. The heat exchanger 1 is connected to the heat exchanger side passage 9.

  FIG. 2 shows an arrangement structure of the actuator 3. The actuator 3 is fixed to the heat transfer plate 51, and one end of the heat transfer plate 51 is fixed through by an inlet pipe portion 41 for flowing the refrigerant into the heat exchanger 1. The heat exchanger 1 has a cylindrical shape, and the refrigerant pipe portion 11 following the inlet pipe portion 41 is housed in a folded shape, and the outlet portion from the heat exchanger 1 is the outlet pipe portion 6. The outlet pipe portion 6 is connected to an internal combustion engine (not shown).

  Next, the operation of the first embodiment will be described.

  When there is a request for warming up when the cooling water temperature of the internal combustion engine is low, such as immediately after the start of the internal combustion engine, the exhaust heat recovery mode is selected, and a control device (not shown) issues a command to the actuator 3 to exchange heat with the valve 2. The container side passage 9 rotates in the opening direction. Since the exhaust gas flows into the heat exchanger side passage 9, the refrigerant in the refrigerant pipe portion 11 is heated, and since this refrigerant flows in the internal combustion engine, the internal combustion engine can be warmed up. After the internal combustion engine is sufficiently warmed up, the control device rotates the valve 2 by the actuator 3 to switch to the normal mode in which the exhaust gas flows through the bypass passage 10.

  As shown in FIG. 2, the actuator 3 that rotates the valve 2 is fixed to a heat transfer plate 51, and one end of the heat transfer plate 51 is fixed through by an inlet pipe portion 41. The rise in temperature of the actuator 3 is suppressed via the heat transfer plate 51 by the refrigerant having a low temperature in the inlet pipe portion 41 before being performed. As a result, the actuator 3 can be protected from the heat of the exhaust system. Further, since the heat transfer plate 51 is interposed between the heat exchanger 1 and the actuator 3, the heat transfer plate 51 serves as a heat shield plate that blocks the radiant heat from the heat exchanger 1, so that the temperature of the actuator 3 Contributes to restraining the rise.

  FIG. 3 shows a second embodiment. The difference from the first embodiment is the heat transfer plate mounting structure. In the second embodiment, the heat transfer plate 52 is extended and fixed to the heat exchanger 1. In this case, since the heat transfer plate 52 is fixed to the heat exchanger 1, there is an effect of protecting the inlet pipe portion 41 and the actuator 3 from the vibration of the vehicle.

  Further, the fixing position of the heat transfer plate 52 to the heat exchanger 1 may be on the actuator 3 side or the inlet pipe portion 41 side when FIG. 3 is viewed from the front, but as shown in FIG. However, since the heat of the heat exchanger 1 is relaxed by the inlet pipe portion 41 and transmitted to the actuator 3, it can be said to be a desirable structure. Moreover, you may provide the fixing position to the heat exchanger 1 of the heat exchanger plate 52 in both the actuator 3 side and the inlet pipe part 41 side.

  FIG. 4 shows a third embodiment. Like the inlet pipe portion 42 shown in FIG. 4, the contact surface with the heat transfer plate 52 is expanded concentrically to enhance the heat conduction effect. The structure of FIG. 4 may be a structure in which the heat transfer plate 51 is not fixed to the heat exchanger 1 as in the first embodiment.

FIG. 5 shows a fourth embodiment. Like the heat transfer plate 53 shown in FIG. 5, the portion in contact with the side surface of the inlet pipe portion 41 is expanded to enhance the heat conduction effect. The structure of FIG. 5 may be a structure in which the heat transfer plate 51 is not fixed to the heat exchanger 1 as in the first embodiment.

1 Heat Exchanger 2 Valve 3 Actuator 41 Inlet Pipe Part 42 Inlet Pipe Part 51 Heat Transfer Plate 52 Heat Transfer Plate 6 Outlet Pipe Part 9 Heat Exchanger Side Passage 10 Bypass Passage 11 Refrigerant Pipe Part

Claims (3)

A heat exchanger disposed in the exhaust gas path for performing heat exchange between the exhaust gas and the refrigerant;
A valve for changing the proportion of exhaust gas passing through the heat exchanger;
An actuator for controlling the valve;
An inlet pipe part into which a refrigerant flows into the heat exchanger;
A heat transfer plate attached to the inlet pipe portion and fixing the actuator;
Exhaust gas heat exchanger actuator arrangement structure comprising The actuator arrangement structure for an exhaust gas heat exchanger according to claim 1, wherein the heat transfer plate is fixed to the heat exchanger. The fixing position of the heat transfer plate to the heat exchanger is on the opposite side of the fixing position of the actuator to the heat transfer plate across the attachment position of the inlet pipe portion to the heat transfer plate. The actuator arrangement structure for an exhaust gas heat exchanger according to claim 2.

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