A heat exchanger collects exhaust heat of high temperature so as to warm up an engine and to heat a cabin and a battery and reduces noise of an exhaust gas. The heat exchanger may include a case provided with an exhaust inlet at one side and an exhaust outlet at the other side, an exhaust gas flowin
A heat exchanger collects exhaust heat of high temperature so as to warm up an engine and to heat a cabin and a battery and reduces noise of an exhaust gas. The heat exchanger may include a case provided with an exhaust inlet at one side and an exhaust outlet at the other side, an exhaust gas flowing in through the exhaust inlet and flowing out through the exhaust outlet, a coolant pathway formed in the case and fluidly communicating with a coolant inlet and a coolant outlet so as to pass coolant, an exhaust pathway formed in a pipe shape, disposed close to the coolant pathway in the case, and provided with one end connected to the exhaust inlet and the other end connected to the exhaust outlet so as to pass the exhaust gas, a bypass pathway formed in a pipe shape, disposed at a middle portion of the exhaust pathway along a length direction thereof, provided with one end selectively connected to the exhaust inlet through a valve and the other end always connected to the exhaust outlet so as to pass the exhaust gas selectively, and a connecting pipe radially extending from an exterior circumference of the bypass pathway to the exhaust pathway so as to send a portion of the exhaust gas passing through the bypass pathway to the exhaust pathway.
대표청구항▼
1. A heat exchanger comprising: a case provided with an exhaust inlet at one side and an exhaust outlet at another side, an exhaust gas flowing in through the exhaust inlet and flowing out through the exhaust outlet;a coolant pathway formed in the case and fluidly communicating with a coolant inlet
1. A heat exchanger comprising: a case provided with an exhaust inlet at one side and an exhaust outlet at another side, an exhaust gas flowing in through the exhaust inlet and flowing out through the exhaust outlet;a coolant pathway formed in the case and fluidly communicating with a coolant inlet and a coolant outlet so as to pass coolant therethrough;an exhaust pathway having a tubular shape, disposed close to the coolant pathway within the case, and provided with one end connected to the exhaust inlet and the other end connected to the exhaust outlet so as to pass the exhaust gas, wherein the exhaust gas passing through the exhaust pathway exchanges heat with the coolant passing through the coolant pathway;a bypass pathway having a tubular shape, disposed at a middle portion of the exhaust pathway along a length direction thereof, provided with one end selectively connected to the exhaust inlet and the other end always connected to the exhaust outlet, wherein the exhaust gas passing through the bypass pathway exchanges heat with the coolant passing through the coolant pathway; anda connecting pipe radially extending from an exterior circumference of the bypass pathway to the exhaust pathway so as to send a portion of the exhaust gas passing through the bypass pathway to the exhaust pathway; anda valve mounted at a front end portion of the bypass pathway and selectively connecting the exhaust inlet to the bypass pathway through the connecting pipe;wherein the exhaust gas enters the bypass pathway and flows into the exhaust pathway through the connecting pipe so as to reduce noise of the exhaust gas when the valve is open, and the exhaust gas enters the exhaust pathway directly when the valve is closed; andwherein the valve is closed so as for the exhaust gas to pass through the exhaust pathway when speed of the exhaust gas is lower than a predetermined speed, and the valve is open such that the exhaust gas passes through the bypass pathway and a portion of the exhaust gas is flowed into the exhaust pathway through the connecting pipe when the speed of the exhaust gas is higher than the predetermined speed. 2. The heat exchanger of claim 1, wherein the coolant pathway comprises: a first coolant pathway disposed between the case and the exhaust pathway causing the coolant to exchange heat with the exhaust gas passing through the exhaust pathway; anda second coolant pathway disposed between the exhaust pathway and the bypass pathway causing the coolant exchange heat with the exhaust gas passing through the exhaust pathway and the bypass pathway;wherein the first and second coolant pathways communicate with each other through a coolant connecting pipe. 3. The heat exchanger of claim 2, wherein the connecting pipe penetrates the second coolant pathway and fluidly communicates the bypass pathway with the exhaust pathway. 4. The heat exchanger of claim 2, wherein an air gap is formed between the bypass pathway and the second coolant pathway. 5. The heat exchanger of claim 2, wherein an exterior circumference of the exhaust pathway and an exterior circumference of the second coolant pathway are corrugated along a circumferential direction thereof so as to increase heat exchanging area. 6. The heat exchanger of claim 1, wherein volume of the exhaust pathway is larger than that of the bypass pathway. 7. A heat exchanger comprising: a case provided with an exhaust inlet at one side and an exhaust outlet at the other side, an exhaust gas flowing in through the exhaust inlet and flowing out through the exhaust outlet;a first coolant pathway formed along an interior circumference of the case and fluidly communicating with a coolant inlet and a coolant outlet so as to pass coolant therethrough;an exhaust pathway having a tubular shape, inserted in the first coolant pathway, and provided with one end connected to the exhaust inlet and another end connected to the exhaust outlet so as to pass the exhaust gas therethrough;a second coolant pathway having a tubular shape, inserted in the exhaust pathway, and fluidly communicating with the first coolant pathway so as to pass the coolant therethrough, wherein the first and second coolant pathways communicate with each other through a coolant connecting pipe;a bypass pathway having a tubular shape, inserted in the second coolant pathway, and provided with one end selectively connected to the exhaust inlet and another end always fluidly connected to the exhaust outlet so as to selectively pass the exhaust gas therethrough;a connecting pipe fluidly communicating the bypass pathway with the exhaust pathway; anda valve mounted at a front end portion of the bypass pathway and selectively connecting the exhaust inlet to the bypass pathway through the connecting pipe;wherein the exhaust gas passing through the exhaust pathway exchanges heat with the coolant passing through the first and second coolant pathways;wherein the exhaust gas passing through the bypass pathway exchanges heat with the coolant passing through the second coolant pathway;wherein the exhaust gas enters the bypass pathway and flows into the exhaust pathway through the connecting pipe so as to reduce noise of the exhaust gas when the valve is open, and the exhaust gas enters the exhaust pathway directly when the valve is closed; andwherein the valve is closed so as for the exhaust gas to pass through the exhaust pathway when speed of the exhaust gas is lower than a predetermined speed, and the valve is open such that the exhaust gas passes through the bypass pathway and a portion of the exhaust gas is flowed into the exhaust pathway through the connecting pipe when the speed of the exhaust gas is higher than the predetermined speed. 8. The heat exchanger of claim 7, wherein the valve is open when the engine operates above a predetermined speed and the valve is closed in a case that the engine operates below a predetermined speed. 9. The heat exchanger of claim 7, wherein an air gap is formed between the bypass pathway and the second coolant pathway. 10. The heat exchanger of claim 7, wherein an exterior circumference of the exhaust pathway and an exterior circumference of the second coolant pathway are corrugated along a circumferential direction thereof so as to increase heat exchanging area. 11. The heat exchanger of claim 7, wherein volume of the exhaust pathway is larger than that of the bypass pathway.
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이 특허에 인용된 특허 (3)
Goldstein Vladimir L. (Woodbridge CAX), Corrugated plate heat exchanger.
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