KR20170141580A - Exhaust gas valve - Google Patents

Abstract

In the present invention, an exhaust gas valve (10) includes one inlet (12) and two outlets (14, 16), in which one outlet of the two outlets is guided to a heat exchanger (18). In this case, an angle () between the two outlets (14, 16) is less than 90, a valve member (24) is rotatably supported between end portions thereof along an extension portion thereof in a movement direction, and the outlets (14, 16) can be both completely closed. An object of the present invention is to provide the exhaust gas valve which can be adjusted with less force.

Description

Exhaust gas valve {EXHAUST GAS VALVE}

The present invention relates to an exhaust gas valve that can be provided in an exhaust gas line to selectively route the exhaust gas through a heat exchanger or a bypass. In this case, typically any intermediate positions are feasible, which can control the heat quantity lost from the exhaust gas. Such heat transfer to the heating or cooling system of the vehicle occurs in the heat exchanger mentioned.

In this connection, for example, JP 200484959 A discloses an arrangement in which a throttle flap is arranged at a bypass inlet. However, such an arrangement exhibits disadvantages associated with flow losses, because at least the throttle flap disposed at the start of bypass only increases the flow resistance if the exhaust gas flows in the bypass direction.

US 2011/0099989 A1 also shows a similar arrangement in which the exhaust flow is deflected to some extent in two open states of the flaps hingedly connected to the ends, and this deflection likewise raises the flow resistance. Further, the flap having one side hingedly connected as described above requires a considerable driving force.

Finally, US 2013/0061584 A1 relates to an exhaust gas valve with a valve member in which a hinged connection is made centrally, wherein the valve member is always in contact with the flow direction only when the exhaust gas is to be guided through the heat exchanger Is set to a position of at least 90 [deg.] So that the exhaust gas flow can be deflected to the heat exchanger. This situation again again significantly increases the flow resistance at least where the exhaust gas is guided through the heat exchanger. The above-mentioned document also suggests that by setting the flap to an angle of less than 90 degrees with respect to the flow direction, the exhaust gas flow is directed to the heat exchanger at a nearly acute angle. This enhances the flow resistance synergistic effect described above.

Therefore, a basic problem of the present invention is to provide an exhaust gas valve that has a flow resistance as small as possible and, furthermore, preferably can be adjusted with as little force as possible.

The solution of the above problem is solved by the exhaust gas valve described in patent claim 1.

Thus, the exhaust gas valve has one inlet and two outlets, in which case one of the two outlets is guided to a heat exchanger, and the angle between the two outlets is less than 90 degrees. For this reason, a nearly Y-shaped valve is formed, and no outlet of the two outlets is disposed at an angle of 90 DEG or more relative to the inlet 12. Therefore, in any case, the exhaust gas flow can not be deflected at an angle of 90 DEG or more, and consequently very small flow resistance can be achieved. In this case, the inlet means a line in which the valve member is disposed and is guided to the movable region. The outlets are lines guided from the mentioned (move-) region. In particular, in the case of the Y-shaped valve, the deflection of the exhaust gas flow required for at least one outlet in the case of the Y-shaped valve can be ended and the main flow direction at each outlet can be fixedly installed so that the main flow direction of the individual outlet and / The above-described angular relationship is applied to the central axis. The valve member described below is preferably provided as a single valve member. Such a valve member may also be referred to as a butterfly valve or a butterfly valve.

The valve member, which can completely close both of the other two outlets, is rotatably supported between its ends when viewed along the extension and in the flow direction. In other words, the pivot bearing is not located at one end of the flap valve member but is supported along the extension of the valve member. Therefore, due to the exhaust gas pressure, the force acts on both sides of the pivot bearing, more precisely in opposite directions, on both side sections of the valve member. For this reason, in certain cases a fully balanced valve member may be provided, which reduces the driving force to a minimum. Low driving forces enable the use of relatively small and cost-effective actuators.

In addition, even when the area for both sides of the pivot bearing is different, the required driving force can be kept to an allowable limit, and in this case particularly preferably, the exhaust gas pressure is applied to the valve member by closing one of the outlets The arrangement capable of being pressed to a specific position can be realized. This position can be chosen, for example, to be set for safety reasons, i.e., when the actuator of the valve member, which may be designed to be electrically, mechanically or pneumatically, fails. As will be described in more detail below, the valve member according to the present invention can preferably be designed such that its rotational axis is out of the flow range, resulting in very small flow resistance. Thus, heat can be obtained from the exhaust gas in an effective manner, and thus the heat can be used, for example, for indoor heating. However, the heat obtained from the exhaust gas may also be supplied to the engine cooling system to achieve faster engine heating.

Preferred improvements are described in the appended claims.

For example, the valve member may be located in the same plane as the at least one inner wall of the inlet and / or the outlet opening in at least one fully closed position. In other words, the valve member forms an open flow channel wall between the wall of the inlet and the wall of the open outlet. As described, in this case it appears that the axis of rotation of the valve member is preferably located outside the flow range, i.e., almost in its own wall area, so that negative flow effects can be avoided. In other words, this situation is achieved when the valve member is designed in a plane, and the rotational axis of the valve member is located in the plane region. In this connection, the exhaust gas valve according to the present invention can be formed in particular such that the inlet is located in the same plane as the outlet of one of the two outlets, so that when the outlet in the same plane is opened, .

As already outlined above, very little driving force can be realized by the valve member extending approximately the same distance to both sides of the pivot bearing. In particular, it is desirable that the valve member has approximately the same area with respect to both sides of the pivot bearing.

Alternatively, in certain applications it is desirable that the valve member has an area that is not the same for both sides of the pivot bearing, so that the inflow of exhaust gas presses the valve member to a position where one of the outlets is closed You may. This situation on the one hand advantageously reduces the driving force for setting the valve member to the position to press the exhaust gas flow in any case. On the other hand, this position can be used as a "Fail Safe" position when an electrical, mechanical or pneumatic actuator fails. Unlike the case where the valve member is balanced, the valve member reaches a prescribed position, and this prescribed position can be an open position where the outlet to be guided toward the heat exchanger continues to provide heat recovery have. However, if there is a risk that the exhaust gas flow that continues through the heat exchanger due to the particular case can damage or destroy the heat exchanger, an alternative position, preferably closed with the outlet to be guided to the heat exchanger, is "fail safe" Position.

Depending on the application, the valve may be located upstream or downstream of the heat exchanger as viewed in the flow direction. When disposed upstream in the flow direction, a relatively smaller flow resistance appears. When the valve is positioned downstream of the heat exchanger as viewed in the direction of flow, the valve is preferably thermally less loaded.

Although the "fail safe" position as described above can be ensured by the shape of the valve member, in certain cases it is advantageous to ensure, or at least support, such a "fail safe" to provide. Accordingly, the valve member is preferably connected to the spring, which applies a prestress to the valve member to the position at which the outlet is closed. In this case correspondingly the advantages of the two alternative "fail safe" positions mentioned above can be used.

Because the exhaust gas valve according to the present invention is located in a relatively high temperature environment, for the lifetime of the actuator, which can be designed electrically, mechanically or pneumatically or in other suitable manner, as mentioned, the actuator is protected from heat . For example, since a DC motor of an electric actuator is particularly sensitive to temperature, a design scheme for protecting such an actuator from heat provides a special advantage.

In order to further improve the heat management as well as the adjustment accuracy through the exhaust gas valve according to the present invention, the valve member is preferably connected to a position sensor. As a result, the precise position of the valve member can be monitored very easily, and as a result, the precise position of the valve member can be set. With respect to the position sensor, it is also desirable to protect the position sensor from heat, due to the temperature sensitivity of the position sensor.

As already mentioned, the thermal management that can be achieved by the exhaust gas valve according to the invention is achieved in a particularly different way if the valve member can be set to any intermediate position between the two closed positions .

Furthermore, for the closed positions, it is advantageous if a sealing stopper is present. This, on the other hand, can reduce leakage to a minimum. Also, "locking" of the valve member at the closed position can be prevented. Finally, in the closed position, the valve member is preferably stabilized against impact when the valve member is directed toward the stopper.

With regard to the operation of the valve member, it may be desirable to change the force provided to the valve member during the opening stroke. For example, it may be desirable to provide a very high opening force at the beginning of the opening motion, so that, for example, subsequent engagement can be separated. In this case, a cam element disposed between the actuator and the valve member has been shown to be desirable in order to set an appropriate force path.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the drawing:
1 shows a first embodiment of an exhaust gas valve according to the invention in a first position;
Figure 2 shows a first embodiment of an exhaust gas valve according to the invention in a second position;
Figure 3 shows a second embodiment of an exhaust gas valve according to the invention in a first position; And
Figure 4 shows a second embodiment of the exhaust gas valve according to the invention in a second position.

1, an exhaust gas valve 10 according to the present invention is positioned between one inlet 12 and two outlets 14, 16, wherein one outlet 16 of the two outlets is connected to the outlet 16, Is guided to the heat exchanger (18), and the other outlet (14) is guided to the bypass (20). The line 22 guided from the heat exchanger and the bypass 20 are joined again downstream in the flow direction. Therefore, depending on the position of the valve member 24, the exhaust gas may be at least partially deprived of heat by the heat exchanger 18 perfusion. As shown in Fig. 1, alternatively, the valve member 24 may be set such that the exhaust gas flow is entirely passed through the bypass 20. Fig.

1, the valve member 24 defines a portion of the flow channel and the rotational axis 26 of the flow channel is located in the region where the flat valve member 24 is located, . This results in the least flow effects, and the flow resistance can be kept at a low level. This is also achieved by forming angles? Between the central axes of the two outlets 14 and 16 at an acute angle, i.e. less than 90 degrees, and consequently at the position shown in Figure 1, With a relatively small angle of resistance and with it.

In the alternative position shown in Figure 2, where the bypass is closed and the outlet 16 guided to the heat exchanger 18 is fully open, the flow effect is very small because the inlet 12 is open Because it lies on the same plane as the outlet 16. Therefore, a minimum pressure drop also occurs in the region of the valve 10. As can be seen in Fig. 2, in this case, the flat valve member lies flush with the left sidewall of the inlet 12 in Fig. 2, as well as the sidewall of the outlet 16, corresponding thereto. This fact is similarly applied to the rotary shaft 26 disposed outside the flow range again. 2, the valve member 24 extends approximately the same distance to the two sides of the rotary shaft 26, so that the above-described balanced arrangement can be achieved and the driving force can be maintained at a very low level .

This applies equally to the second embodiment shown in Fig. 3, in which the second embodiment merely places the outlet 14 through the inlet 12 and the bypass 20 in the same plane, 2 < / RTI > On the other hand, as shown in FIG. 3, when the flow is guided through the outlet 16 which is guided by the heat exchanger 18, the flow is still biased in an acceptable range.

In addition, FIG. 4 illustrates a situation where the flow experiences a very small resistance when the flow is guided through the bypass 20. FIG. Additionally, the two embodiments described above also allow the bypass 20 to flow downstream of the heat exchanger 18, as viewed in the flow direction, and in addition to that, basically, the bypass 20 leads from the heat exchanger 18 to the line 22 (See FIG. 1). In the embodiment of FIGS. 3 and 4, the position where the line 22 originating from the heat exchanger leads to the bypass 20 is addressed. As mentioned above, the corresponding advantages may optionally be beneficial to the flow through the two outlets, provided that one of the two valve positions is suitably provided to the "fail-safe" -position. When the position shown in Figure 1 is a "fail-safe" position, overheating of the heat exchanger can be prevented, while when the position shown in Figure 2 is the "fail-safe" Heat recovery can be assured. On the other hand, the very small flow resistance as described above is achieved without the risk of overheating of the heat exchanger 18 when the "fail safe" -position is the position shown in FIG. Finally, when the "fail safe" -position is addressed in the configuration according to FIG. 3, heat recovery is ensured with permissible flow resistance.

10: Exhaust gas valve
12: inlet
14: Outlet
16: Outlet
18: Heat exchanger
20: Bypass
22: line
24: valve member
26:

Claims (11)

An exhaust gas valve (10) having one inlet (12) and two outlets (14, 16)
Wherein one outlet of the two outlets is guided by a heat exchanger 18 and the angle a between the two outlets 14 and 16 is less than 90 degrees and the valve member 24 extends along its extension and Is rotatably supported between its ends as viewed in the flow direction and is capable of fully closing both of said outlets (14, 16). The method according to claim 1,
Characterized in that the valve member (24) is located in the same plane as the inlet and at least one inner wall of the open outlet (14, 16) in at least one position in which it is fully closed and the rotational axis (26) Is outside the range of the exhaust gas flow. 3. The method of claim 2,
Characterized in that the valve member (24) extends the same distance to both sides of the pivot bearing and has the same area with respect to both sides. The method of claim 3,
Characterized in that the valve member (24) has an unequal area with respect to both sides of the pivot bearing so that the inflow of exhaust gas presses the valve member (24) to a position where the outlet is closed. The method according to claim 1,
And the exhaust gas valve is disposed upstream or downstream of the heat exchanger when viewed in the flow direction. The method according to claim 1,
Characterized in that the valve member (24) is connected to a spring and the spring applies an initial prestress to the valve member (24) to a position where the exhaust ports (14, 16) are closed. The method according to claim 1,
Wherein the actuator is protected from heat. The method according to claim 1,
Characterized in that the valve member (24) is connected to a position sensor. The method according to claim 1,
Characterized in that the valve member (24) can be set to any intermediate position between the two closed positions. The method according to claim 1,
Characterized in that in at least one closed position there is a sealing stopper. The method according to claim 1,
Characterized in that the valve member (24) is connected to the actuator via at least one cam element (cam element).

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