KR20200013402A - Exhaust heat recovery system having dual valve - Google Patents

Abstract

The present invention relates to an exhaust heat recovery apparatus having a dual valve. According to one embodiment of the present invention, provided is the exhaust heat recovery apparatus comprising: a heat exchanger for increasing the temperature of cooling water by exchanging heat with the exhaust heat of an exhaust gas; a housing having an inner flow path formed therein so as to receive the exhaust gas from the outside such that the exhaust gas flows therethrough; a valve assembly including a first valve unit for selectively blocking one from among a heat exchange path of the heat exchanger and the inner flow path of the housing, and a second valve unit independently rotating with respect to the first valve unit so as to open and close the inner flow path of the housing; and a push rod for moving the first valve unit in the direction in which the first valve unit blocks the flow of the heat exchange path according to the transmission of an external force to the first valve unit. According to the present invention, noise generated by the flow of exhaust gas can be greatly reduced.

Description

EXHAUST HEAT RECOVERY SYSTEM HAVING DUAL VALVE

The present invention relates to an exhaust heat recovery apparatus having a double valve, and more particularly, to an exhaust heat recovery apparatus to which a double valve is applied to reduce noise caused by the flow of exhaust gas.

In general, the exhaust heat recovery apparatus of a vehicle refers to a device that recovers exhaust heat that is discarded after engine combustion and is used for warming up an engine or a transmission, or transferred to an air conditioning device such as a heater to be used for heating the vehicle.

The exhaust heat recovery apparatus can heat the coolant before warming up by using high temperature exhaust gas at the initial start-up of the vehicle. Accordingly, the preheating time of the engine can be shortened, thereby improving fuel efficiency and reducing exhaust gas.

It is known that the pollutants emitted from the vehicle are most discharged at idling before the engine is warmed up. By using the exhaust heat recovery device, the pollutants emitted from the vehicle can be significantly reduced by shortening the warm-up time. .

In addition, the coolant heated by the exhaust heat recovery device can quickly increase the temperature of the engine and the transmission to an appropriate temperature to reduce the internal friction of the engine and the transmission required for each drive system, it is possible to make the indoor heating in the winter quickly.

Conventional exhaust heat recovery apparatus has a structure that rotates the bypass valve by separately provided with a valve actuator on the outside of the bypass passage and the heat exchanger through the bypass valve.

At this time, the valve actuator is generally configured to open and close the bypass valve according to the temperature of the coolant. That is, since the valve actuator applied to the conventional exhaust heat recovery device is configured to increase or decrease the rotation amount of the bypass valve according to the temperature of the cooling water, when the temperature of the cooling water is overheated above the reference value, the bypass valve is rotated excessively. There is a problem that can cause damage to the pass valve.

Korean Patent Registration No. 10-1499221

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to provide an additional displacement section in the valve that can absorb the coolant even if it is overheated above the reference value so that excessive force is not applied to the valve. To prevent damage to the components.

In addition, another object of the present invention is to reduce the noise that may be caused by the flow of the exhaust gas by applying a double valve that moves independently in the exhaust heat recovery process.

According to an embodiment of the present invention, a heat exchanger having an inlet and an outlet is formed inside, a heat exchanger having a cooling water inlet pipe and a cooling water outlet pipe, and heat exchange with the exhaust heat of the exhaust gas to increase the temperature of the cooling water; A housing provided on one side of the heat exchanger to receive the exhaust gas from the outside and to form an internal flow path inside the exhaust gas, and to communicate with the inlet and the outlet; A first valve unit rotatably provided in the housing and selectively blocking one of a heat exchange flow path of the heat exchanger and an internal flow path of the housing, and the same rotation center as the first valve unit; A valve assembly including a second valve unit that rotates independently of the valve unit to open and close an internal flow path of the housing; And a direction in which the first valve unit blocks the flow of the heat exchange path as the wax provided therein and the protrusion amount to the outside is increased by the wax when the temperature of the cooling water rises to transmit external force to the first valve unit. An actuator having a push rod configured to move to a second position, wherein the first valve unit is configured to self absorb an additional displacement (over stroke) of the push rod that protrudes above a reference value when the coolant is overheated, 2 the valve unit is configured to open and close the internal flow path in conjunction with the flow rate of the exhaust gas flowing through the internal flow path of the housing independently of the first valve unit in a state in which the first valve unit is blocking the heat exchange flow path. Characterized in that, an exhaust heat recovery apparatus having a double valve can be provided.

The housing may include a baffle formed at a position between the inlet and the outlet in the inner flow passage of the housing to close the inner flow passage of the housing but have an opening formed at the center portion thereof so that the exhaust gas can partially pass. Can be.

In addition, the first valve unit may be rotated to cover the opening of the baffle when blocking the flow of the internal flow path of the housing, and to cover the outlet when blocking the flow of the heat exchange passage of the heat exchanger.

The first valve unit may include: a first rotating shaft rotatably installed in the housing and having one side in a longitudinal direction protruding out of the housing; A first valve coupled to one side of the first rotary shaft and selectively blocking one of the heat exchange passage and the internal passage according to a rotation direction of the first rotary shaft; A shaft bracket fixedly coupled to one longitudinal side of the first rotary shaft and integrally rotated with the first rotary shaft; A valve return spring for applying an elastic force to the shaft bracket in a direction in which the first valve blocks the internal flow path of the housing; A rotary cam inserted into the end of the first rotary shaft to penetrate the central portion, the rotary cam being rotatable separately from the first rotary shaft; The first valve may include a cam return spring applying an elastic force to the rotary cam in a direction of blocking the internal flow path of the housing, but having a spring constant greater than that of the valve return spring.

In addition, the second valve unit has a first rotational shaft inside the first rotary shaft and the first rotational shaft is embedded in the first rotary shaft via a bearing so as to be rotated independently of the first rotary shaft 2 rotating shafts; One side is coupled to the second rotation shaft, and the internal flow path of the housing is opened and closed independently of the first valve along the rotational direction of the second rotation shaft while the first valve blocks the heat exchange flow path. A second valve; And a shaft return spring configured to apply an elastic force to the second rotation shaft in a direction in which the second valve closes the internal flow path.

In addition, a pulsation preventing hole may be formed in a central portion of the second valve to prevent the second valve from vibrating by pulsation of exhaust gas when the second valve closes the internal flow path of the housing. .

In addition, the first valve may be characterized in that the elastic mat is installed on the surface facing the second valve to prevent a collision or contact noise with the second valve.

In addition, the rotary cam, the insertion hole formed on the rotation center so that one end in the longitudinal direction of the first rotary shaft; And a pressurizing protrusion protruding to extend in a tangential direction of the outer circumferential surface on the outer circumferential surface spaced a predetermined distance from the insertion hole and pressed by the push rod.

In addition, the wax is configured to adjust the amount of the inflow into the actuator according to the temperature of the coolant, and when the coolant temperature rises, the inflow of the wax in the actuator is increased to increase the external protrusion of the push rod You can do

On the other hand, the wax is configured to thermally expand according to the temperature of the cooling water in the state encapsulated inside the actuator to increase the volume, and when the cooling water temperature rises, the thermally expanded wax pushes the push rod, the amount of external protrusion of the push rod It may be characterized by increasing.

According to the present invention, by additionally providing an additional displacement section in the valve to absorb the coolant even if it is overheated above the reference value, it is possible to prevent damage to the valve and other components by preventing excessive force is applied to the valve.

In addition, according to an embodiment of the present invention by applying a double valve to move independently of each other in the exhaust heat recovery process there is an effect that the noise generated by the flow of the exhaust gas is largely reduced.

1 is a perspective view showing an exhaust heat recovery apparatus according to an embodiment of the present invention in one direction.
FIG. 2 is an external perspective view of FIG. 1 shown in another direction. FIG.
3 is a partially exploded perspective view illustrating an exploded portion of FIG. 1.
Figure 4 is a plan cross-sectional view showing the configuration and structure of the exhaust heat recovery apparatus according to an embodiment of the present invention.
5 is a plan view from above of an exhaust heat recovery apparatus according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating line AA of FIG. 5.
FIG. 7 is an operational state diagram illustrating a state in which the first valve unit blocks the heat exchange path of the heat exchanger by a push rod in which the coolant is warmed up and protrudes in the state of FIG. 4.
FIG. 8 is an operational state diagram illustrating a state in which the first valve unit self-absorbs an overstroke of a push rod that protrudes beyond a reference value when the coolant is overheated in the state of FIG. 7.
9 to 12 illustrate a state in which the second valve unit opens and closes the internal flow path of the housing independently of the first valve unit while the first valve unit blocks the heat exchange flow path of the heat exchanger. It is a state diagram showing the operation.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the embodiment of the present invention. The following description is one of several aspects of the patentable invention and the following description may form part of the detailed description of the invention.

However, in the description of the present invention, a detailed description of known configurations or functions may be omitted for clarity of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only used to distinguish one component from another.

When a component is said to be 'connected' or 'connected' to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between Should be.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Hereinafter, an exhaust heat recovery apparatus 10 having a double valve according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, referring to FIGS. 1 to 4, an exhaust heat recovery apparatus 10 having a double valve according to an embodiment of the present invention may be classified into a heat exchanger 100, a housing 200, and a first valve unit 300. A valve assembly 500 including the second valve unit 400 and an actuator 600, wherein the first valve unit 300 further displaces the push rod 610 that protrudes above a reference value when the coolant is overheated. (Overstroke) is configured to self-absorb, and the second valve unit 400 houses the housing independently of the first valve unit 300 while the first valve unit 300 is blocking the heat exchange flow path 101. It is characterized in that it is configured to open and close the inner passage 201 in conjunction with the flow rate of the exhaust gas flowing through the inner passage (201) of (200).

The fact that an embodiment of the present invention includes the above-listed components does not mean that they consist only of these components, but basically includes these components, and in addition to other components (for example, well-known technology well known in the exhaust heat recovery apparatus 10). ) May be included, but a detailed description thereof will be omitted since it may obscure the subject matter of the present invention.

Exhaust heat recovery apparatus 10 according to an embodiment of the present invention is to heat the cooling water of the vehicle by using the high temperature exhaust gas heat discharged from the vehicle engine, the heat exchange between the exhaust gas and the cooling water according to the temperature of the cooling water is It can be done selectively.

The heat exchanger 100 has a predetermined heat exchange passage 101 formed therein so that exhaust gas can pass therethrough, and a coolant core 102 capable of exchanging heat with the exhaust gas is disposed on the heat exchange passage 101. The cooling water core 102 is formed with a flow path through which cooling water flows.

In addition, the inlet 110 for allowing exhaust gas to flow into the heat exchanger 100 and the outlet 120 for exhaust gas to go out of the heat exchanger 100 are respectively provided at one side and the other side of the heat exchange passage 101. The inlet 110 and the outlet 120 may be formed to protrude outwardly from the heat exchanger 100 (that is, inside of the housing 200).

In addition, the heat exchanger 100 is a coolant inlet tube 130 for allowing the coolant to flow into the coolant core 102 and a coolant outlet tube for allowing the coolant of the coolant core 102 to flow out of the coolant core 102. It is provided with a 140 so that the cooling water of the elevated temperature through heat exchange with the exhaust heat of the exhaust gas can be used elsewhere. Therefore, the coolant inlet tube 130 and the coolant outlet tube 140 may be connected to one side and the other side of the coolant core 102, respectively.

The housing 200 receives an exhaust gas from an outside (for example, an engine of a vehicle), and has a predetermined internal flow path 201 formed therein so that the exhaust gas flows, and the inlet 110 and the outlet 120 are It is provided on one side of the heat exchanger 100 to communicate with the inside of the housing 200.

The housing 200 may be formed with an inlet 210 through which an external exhaust gas is introduced into the housing 200, and an outlet 220 through which the internal exhaust gas is discharged to the outside of the housing 200. The inlet 210 and the outlet 220 may be formed in a straight line to face each other as shown in FIGS. 1 and 3.

In addition, the housing 200 may include a baffle 230 having an opening 231 formed at a center portion thereof to partially pass the exhaust gas while having a function of closing the inner passage 201. The baffle 230 may block the flow of the exhaust gas by blocking the internal passage 201 in the internal passage 201 of the housing 200, and the baffle 230 may partially pass through the predetermined portion of the exhaust gas. The opening 231 having a structure open to allow the exhaust gas to pass through may be formed.

Here, the baffle 230 may be disposed at a position corresponding to the inlet 110 and the outlet 120 in the inner passage 201 of the housing 200 as shown in FIGS. 3 and 4.

Meanwhile, the valve assembly 500 may largely include a first valve unit 300 and a second valve unit 400.

The first valve unit 300 is provided in the housing 200 to be rotatable in place, and selectively selects any one of the heat exchange passage 101 of the heat exchanger 100 and the internal passage 201 of the housing 200. Can block function.

Here, when the first valve unit 300 blocks the flow of the internal flow path 201 of the housing 200, the first valve unit 300 covers the opening 231 of the baffle 230 so that the exhaust gas is baffle. May not pass through 230.

In addition, when the first valve unit 300 blocks the flow of the heat exchange passage 101 of the heat exchanger 100, the first valve unit 300 is rotated to cover the outlet 120, and thus the heat exchange passage ( Since the flow of the 101 is blocked, the exhaust gas does not flow into the heat exchange passage 101 so that the heat exchange action with the cooling water does not occur in the heat exchanger 100.

In addition, the second valve unit 400 is rotated with the same center of rotation as the first valve unit 300, but is rotated independently with respect to the first valve unit 300 so as to have an internal flow path of the housing 200 ( 201) can be opened and closed.

That is, the first valve unit 300 may open or close any one of the heat exchange passage 101 of the heat exchanger 100 and the internal passage 201 of the housing 200 by rotation, and the second valve unit 400. ) May open or close only the internal flow path 201 of the housing 200 by the rotation, and the first valve unit 300 and the second valve unit 400 have the same center of rotation but may be operated separately from each other. It is configured to be.

Hereinafter, the valve assembly 500 including the first valve unit 300 and the second valve unit 400 will be described in more detail with reference to FIGS. 5 and 6.

First, the first valve 320 unit 300 includes a first rotation shaft 310, a first valve 320, a shaft bracket 330, a valve return spring 340, a rotation cam 350, and a cam return spring ( 360).

First, the first rotary shaft 310 is installed in the housing 200 to be rotatable (rotating) in place, and is configured such that one side (upper end) in the longitudinal direction protrudes out of the housing 200.

In addition, one side of the first valve 320 is coupled to the first rotary shaft 310 to selectively select any one of the heat exchange passage 101 and the internal passage 201 according to the rotation direction of the first rotary shaft 310. Can be blocked.

That is, the first valve 320 is integrally rotated with the first rotation shaft 310 and covers the opening 231 of the baffle 230 to block the internal flow path 201 of the housing 200 when rotated to one side. When it is rotated to the other side, the outlet 120 may be covered to block the heat exchange passage 101 of the heat exchanger 100.

Specifically, the first valve 320 is rotated to block the outlet opening 120 when the push rod 610 pressurizes the rotary cam 350, and then the push rod 610 enters the actuator 600. It returns to its original state by the elastic force of the return spring 340 to cover the opening 231 of the baffle 230.

In addition, the shaft bracket 330 is fixedly coupled to one side in the longitudinal direction of the first rotary shaft 310 may be integrally rotated with the first rotary shaft 310. The valve return spring 340 may apply an elastic force to the shaft bracket 330 in a direction in which the first valve 320 blocks the internal flow path 201 of the housing 200.

The shaft bracket 330 has a cylindrical side wall surrounding one longitudinal side of the first rotary shaft 310 so that the shaft bracket 330 is always balanced regardless of the rotation angle when the shaft bracket 330 is rotated about the first rotary shaft 310. It may be formed in a shape having. In this case, the valve return spring 340 may be applied as a torsion spring which surrounds the outer side surface of the side wall of the shaft bracket 330 and has both ends in the longitudinal direction mounted to one side of the shaft bracket 330 and the housing 200.

In addition, the rotary cam 350 is configured to be inserted into the first rotary shaft 310 so that the end of the first rotary shaft 310 penetrates the center portion, and may be configured to rotate separately from the first rotary shaft 310. have.

Here, the rotary cam 350 is inserted into the insertion hole 351 formed on the center of rotation so that one end in the longitudinal direction of the first rotary shaft 310, as shown in Figure 3, and the constant from the insertion hole 351 It may include a pressing protrusion 352 formed to protrude in a tangential direction of the outer circumferential surface of the outer circumferential surface spaced apart from each other to be pressed by the push rod 610.

In addition, the cam return spring 360 is a configuration for applying an elastic force to the rotary cam 350 in a direction in which the first valve 320 blocks the internal flow path 201 of the housing 200, and the cam return spring 360. ) May be applied as a torsion spring which surrounds one side of the first rotary shaft 310 and has both ends in the longitudinal direction mounted to the rotary cam 350 and the shaft bracket 330.

Here, the cam return spring 360 is provided so as to absorb the additional displacement (overstroke) of the push rod 610 that the coolant is overheated and protrudes outward beyond the reference value, and the cam return spring 360 is the above. It is set to have a spring constant that is greater than the valve return spring 340. In addition, a cam cover 370 may be mounted at the end of the first rotary shaft 310 penetrating the rotary cam 350.

As such, when both the shaft bracket 330, the valve return spring 340, and the cam return spring 360 are formed in a cylindrical shape, the shaft bracket 330 and the valve return spring are independent of the rotation angle of the first rotation shaft 310. The 340 and the cam return spring 360 can always be in a stable state.

Hereinafter, the operation and action of the first valve unit 300 will be described with reference to FIGS. 4, 7, and 8.

First, as shown in FIG. 4, when the temperature of the cooling water is low and the first valve 320 blocks the opening 231 of the baffle 230, the exhaust gas introduced into the inside of the housing 200 is an inlet ( It enters into the heat exchanger 100 through the 110 to pass through the heat exchange passage 101, and passes through the heat exchange passage 101, the coolant core 102 inside the heat exchanger 100 through the coolant inlet pipe 130 After heating the cooling water introduced into the) and exits the heat exchange passage 101 through the outlet 120 is discharged to the outside of the housing 200.

In addition, as shown in FIG. 7, when the temperature of the cooling water rises, the push rod 610 of the actuator 600 protrudes to the outside to push and rotate the rotary cam 350, and a cam return elastically installed on the rotary cam 350. The spring 360 rotates the shaft bracket 330 while rotating without being elastically deformed.

At this time, since the cam return spring 360 has a larger spring constant than the cam return spring 360, when the rotary cam 350 is rotated, the cam return spring 360 does not elastically deform and the valve return spring 340. As a result of only elastic deformation, the shaft bracket 330 is rotated at the same angle as the rotary cam 350.

Since the shaft bracket 330 is integrally connected to the first rotation shaft 310 and the first valve 320, the first valve 320 is rotated by the rotation angle of the shaft bracket 330 so that The outlet 120 may be closed while the opening 231 is opened. When the outlet 120 is closed, since the flow of the heat exchange passage 101 is blocked and the exhaust gas cannot flow along the heat exchange passage 101, the exhaust gas flows along the internal passage 201 of the housing 200. Accordingly, since the exhaust gas passes through the opening 231 of the baffle 230 and is discharged to the outside of the housing 200 as it is, the exhaust gas does not pass through the heat exchange passage 101, and thus the cooling water is no longer heated.

Meanwhile, as shown in FIG. 8, the first valve 320, the first rotation shaft 310, and the shaft bracket are rotated to close the outlet 120 of the heat exchange flow path 101. 330 can no longer be rotated, in which case the coolant is further heated so that the push rod 610 further protrudes beyond the reference value (state of FIG. 7) (overstroke; d) ), The rotation cam 350 is further rotated by the protrusion amount d of the push rod 610, but the additional rotation amount r of the rotation cam 350 is absorbed by the cam return spring 360. do. That is, the cam return spring 360 is elastically deformed by the amount of rotation r of the rotary cam 350 according to the additional displacement d of the push rod 610.

Therefore, even if the coolant is further heated to further rotate the cam 350, the rotational force applied to the cam 350 is absorbed by the cam return spring 360 without being transmitted to the first valve 320. Parts such as the valve 320, the first rotating shaft 310, the shaft bracket 330, the push rod 610, and the like may be prevented from being damaged.

For reference, FIGS. 7 and 8 are for easily explaining the operating state of the first valve unit 300. It is assumed that this state is a high speed rotation section of the engine having a large flow rate of exhaust gas. Thus, in FIGS. 7 and 8, the second valve unit 400 is shown with the opening 231 of the baffle 230 open.

Meanwhile, referring back to FIG. 6, the second valve 420 unit 400 may include a second rotating shaft 410, a second valve 420, and a shaft return spring 430.

The second rotation shaft 410 is installed to have the same rotation center as the first rotation shaft 310 inside the first rotation shaft 310. However, the second rotary shaft 410 is embedded in the first rotary shaft 310 via the bearing 411 so as to be rotated independently without being affected by the rotation of the first rotary shaft 310.

Accordingly, the center of rotation of the second rotary shaft 410 coincides with the center of rotation of the first rotary shaft 310, but the second rotary shaft 410 is independent of the rotation of the first rotary shaft 310. ) Can be freely rotated independently and individually with respect to the first rotary shaft 310.

In addition, one side of the second valve 420 is coupled to the second rotation shaft 410, and the first valve 320 is blocked as shown in FIGS. 9 to 12 while the first valve 320 blocks the heat exchange passage 101. The inner flow path 201 of the housing 200 may be opened and closed independently of the first valve 320 along the rotation direction of the second rotation shaft 410.

That is, the second valve 420 is spaced apart from the first valve 320 only while the first valve 320 is blocking the outlet 120 to block the heat exchange passage 101 of the heat exchanger 100. Since the free state, the internal passage 201 of the housing 200 can be opened and closed in conjunction with the flow rate of the exhaust gas.

For example, in the high-speed rotation section in which the flow rate of the exhaust gas is large while the warming-up of the cooling water is not necessary and no further cooling water is required, as shown in FIG. 8, the second valve 420 opens the opening 231 of the baffle 230. 9 may overcome the restoring force of the shaft return spring 430 by the flow rate of the exhaust gas passing through) and may be in close contact with the first valve 320, but in a medium speed rotation section in which the flow rate of the exhaust gas is gradually reduced, FIGS. As shown, the second valve 420 may be located between the baffle 230 and the first valve 320 by the restoring force of the shaft return spring 430, and in a low speed rotation section where the flow rate of the exhaust gas is small. As shown in FIGS. 11 and 12, a second valve 420 may be positioned to block the opening 231 of the baffle 230.

When the first valve 320 is rotated toward the baffle 230 to block the internal flow path 201 of the housing 200, the first valve 320 pressurizes the second valve 420. Accordingly, the first valve 320 may be implemented to block the opening 231 of the baffle 230 indirectly through the second valve 420.

In addition, the shaft return spring 430 is configured to apply an elastic force to the second rotation shaft 410 in the direction in which the second valve 420 closes the internal flow path 201 of the housing 200, and the shaft return spring When the flow rate of the exhaust gas is smaller than the preset value (reference value), the spring constant may be set so that the second valve 420 may block the opening 231 of the baffle 230. In addition, when the flow rate of the exhaust gas is greater than the reference value, such as a high speed section, the spring constant may be set so that the second valve 420 may open the opening 231 of the baffle 230 to increase the noise reduction effect. As such, the spring constant of the shaft return spring 430 is set to allow the second valve 420 to properly open and close the opening 231 of the baffle 230 in consideration of the flow rate of the exhaust gas.

Meanwhile, referring to FIG. 12, a pulsation preventing hole 421 may be formed at the center of the second valve 420.

The pulsation preventing hole 421 is formed along the inner passage 201 when the second valve 420 closes the inner passage 201 (specifically, the opening 231 of the baffle 230) of the housing 200. Due to the pulsation of the flowing exhaust gas, the second valve 420 may not be completely closed or completely opened in the opening 231 of the baffle 230, and continuously vibrates with the edge of the opening 231 of the baffle 230, thereby generating vibration and noise. It is a structure to prevent that.

For reference, the exhaust gas continues to be discharged after the engine has been started, but the flow rate of the exhaust gas is not large in the idle or low speed rotation range, and the exhaust stroke is performed in a series of continuous combustion strokes, especially intake-compression-explosion-exhaust. Since only the exhaust gas is emitted, the exhaust gas has structural pulsation. Therefore, when the second valve 420 is configured to completely block the opening 231 of the baffle 230, the second valve 420 continues to open and close by the pulsation of the exhaust gas, thereby generating noise and vibration. When the pulsation preventing hole 421 is formed in the second valve 420, a small amount of exhaust gas such as an idle or low speed rotation section passes through the second valve 420 through the pulsation preventing hole 421 and thus the second valve 420. ) Can be prevented from vibrating.

In addition, referring to FIG. 12, an elastic mat 321 is installed on the first valve 320 to prevent noise during collision or contact with the second valve 420 on a surface facing the second valve 420. Can be.

The elastic mat 321 may be in direct contact with or contact with the first valve 320 when the second valve 420 is strongly rotated toward the first valve 320 as shown in FIG. 7. It is possible to prevent the damage to the first valve 320 and the second valve 420 and thereby prevent the noise.

Meanwhile, the actuator 600 may include a wax (not shown) and a push rod 610.

Here, the wax may be configured to adjust the amount introduced into the actuator 600 according to the temperature of the cooling water. Therefore, when the temperature of the cooling water rises, the amount of the wax flowing into the actuator 600 increases. Accordingly, the wax pushes the push rod 610 so that the push rod 610 protrudes out of the actuator 600. The amount is increased.

When the external protrusion amount of the push rod 610 is increased, as shown in FIG. 7, the rotary cam 350 is rotated by the push rod 610, and the rotational force of the rotary cam 350 is the cam return spring 360. The first valve 320 closes the outlet 120 of the heat exchanger 100 through the shaft bracket 330 and is transmitted to the first rotation shaft 310.

At this time, since the linear feed force of the push rod 610 is transmitted to the first rotating shaft 310 through the cam return spring 360 and the shaft bracket 330, rather than directly rotating the first rotating shaft 310. Even if the first valve 320 receives excessive pressing force from the push rod 610, it may be prevented from being damaged.

On the other hand, the wax may be configured in a state in which a predetermined amount is sealed in the actuator 600. Accordingly, the wax encapsulated in the actuator 600 is thermally expanded according to the temperature of the coolant to increase its volume. Accordingly, when the coolant temperature rises, the thermally expanded wax pushes the push rod 610 to push the push rod 610. ) The amount of external protrusions may increase.

As mentioned above, although this invention was demonstrated using the preferable embodiment, the scope of the present invention is not limited to the specific embodiment described, and the person of ordinary skill in the art is not limited within the scope of this invention. Substitution and modification of the components are possible, which also belongs to the rights of the present invention.

10: exhaust heat recovery device with double valve
100: heat exchanger 101: heat exchange path
102: coolant core 110: inlet
120: outlet 130: cooling water inlet pipe
140: coolant outflow pipe 200: housing
201: Inside Euro 210: Inlet
220: outlet 230: baffle
231: opening 300: first valve unit
310: first rotating shaft 320: first valve
321: elastic mat 330: shaft bracket
340: valve return spring 350: rotary cam
351: insertion hole 352: pressing projection
360: Cam return spring 400: Second valve unit
410: second rotary shaft 420: second valve
421: pulsation prevention hole 430: shaft return spring
500: valve assembly 600: actuator
610: push rod

Claims (10)

A heat exchanger having an inlet port and an outlet port formed therein, the heat exchanger having a coolant inlet tube and a coolant outlet tube, and heat exchanged with the exhaust heat of the exhaust gas to increase the temperature of the coolant;
A housing provided on one side of the heat exchanger to receive the exhaust gas from the outside and to form an internal flow path inside the exhaust gas, and to communicate with the inlet and the outlet;
A first valve unit rotatably provided in the housing and selectively blocking one of a heat exchange flow path of the heat exchanger and an internal flow path of the housing, and the same rotation center as the first valve unit; A valve assembly including a second valve unit that rotates independently of the valve unit to open and close an internal flow path of the housing; And
In the direction in which the first valve unit blocks the flow of the heat exchange passage as the wax provided therein and the protrusion amount to the outside is increased by the wax when the temperature of the cooling water rises to transmit the external force to the first valve unit. An actuator having a push rod to be moved,
The first valve unit is configured to self absorb an additional displacement (over stroke) of the push rod that protrudes above a reference value when the coolant is overheated,
The second valve unit is configured to open and close the internal flow path in association with the flow rate of the exhaust gas flowing through the internal flow path of the housing independently of the first valve unit while the first valve unit is blocking the heat exchange flow path. The exhaust heat recovery apparatus provided with the double valve characterized by the above-mentioned. The method according to claim 1,
The housing is
And a baffle disposed at a position between the inlet and the outlet in the inner passage of the housing and closing the inner passage of the housing, the baffle having an opening formed at a central portion thereof to allow the exhaust gas to pass partially. One exhaust heat recovery device. The method according to claim 2,
The first valve unit,
And an opening of the baffle to block the flow of the internal flow path of the housing, and to cover the outlet when the flow of the heat exchange flow path of the heat exchanger is blocked, the exhaust heat recovery device having a double valve. The method according to claim 1 or 2,
The first valve unit,
A first rotatable shaft rotatably installed in the housing and having one longitudinal direction protruding out of the housing;
A first valve coupled to one side of the first rotary shaft and selectively blocking one of the heat exchange passage and the internal passage according to a rotation direction of the first rotary shaft;
A shaft bracket fixedly coupled to one longitudinal side of the first rotary shaft and integrally rotated with the first rotary shaft;
A valve return spring for applying an elastic force to the shaft bracket in a direction in which the first valve blocks the internal flow path of the housing;
A rotary cam inserted into the end of the first rotary shaft to penetrate the central portion, the rotary cam being rotatable separately from the first rotary shaft; And
A cam return spring applying elastic force to the rotary cam in a direction in which the first valve blocks the internal flow path of the housing, but having a spring constant greater than that of the valve return spring;
Exhaust heat recovery apparatus having a double valve comprising a. The method according to claim 4,
The second valve unit,
A second rotating shaft having a same center of rotation as the first rotating shaft in the first rotating shaft but embedded in the first rotating shaft via a bearing to rotate independently of the first rotating shaft;
One side is coupled to the second rotation shaft, and the internal flow path of the housing is opened and closed independently of the first valve along the rotational direction of the second rotation shaft while the first valve blocks the heat exchange flow path. A second valve; And
A shaft return spring for applying an elastic force to the second rotating shaft in a direction in which the second valve closes the internal flow path;
Exhaust heat recovery apparatus having a double valve comprising a. The method according to claim 5,
The central valve of the second valve is characterized in that the pulsation prevention hole for preventing the second valve from vibrating by the pulsation of the exhaust gas when the second valve closes the internal flow path of the housing, double valve Exhaust heat recovery apparatus provided with. The method according to claim 5,
The first valve has an exhaust heat recovery device having a double valve, characterized in that the elastic mat for preventing the collision or contact noise with the second valve on the surface facing the second valve. The method according to claim 1,
The rotary cam,
An insertion hole formed on a rotation center such that one end in a longitudinal direction of the first rotation shaft passes; And
A pressurizing protrusion projecting to extend in the tangential direction of the outer circumferential surface on the outer circumferential surface spaced from the insertion hole by the push rod;
Exhaust heat recovery apparatus having a double valve comprising a. The method according to claim 1,
The wax is configured to adjust the amount introduced into the actuator according to the temperature of the coolant, and when the coolant temperature rises, the inflow of the wax inside the actuator is increased to increase the external protrusion of the push rod. An exhaust heat recovery device provided with a double valve. The method according to claim 1,
The wax is thermally expanded according to the temperature of the cooling water in the state of being sealed inside the actuator to increase the volume, and when the cooling water temperature rises, the thermally expanded wax pushes the push rod to increase the external protrusion of the push rod. An exhaust heat recovery apparatus having a double valve, characterized in that.

Images