JP4665824B2 - Heat storage tank - Google Patents

Description

  The present invention relates to a heat storage tank that keeps a fluid warm.

  Conventionally, as a system using waste heat of a water-cooled internal combustion engine, high-temperature cooling water flowing through a cooling water circuit during operation of the internal combustion engine is stored in a heat storage tank, and the hot water stored in the heat storage tank is electrically pumped Therefore, there has been proposed a system that supplies the internal combustion engine immediately before starting the next internal combustion engine to promote warm-up of the internal combustion engine.

  The present applicant has proposed a heat storage tank suitable for the waste heat utilization system as described above in Japanese Patent Application No. 2006-24288 (hereinafter referred to as a prior application). The heat storage tank includes a check valve that is disposed in a fluid passage through which cooling water flows and allows only the flow of cooling water in one direction, and an open / close valve that opens and closes the fluid passage according to the temperature of the cooling water. I have. Further, in order to always flow the temperature-sensitive cooling water to the temperature sensing portion of the on-off valve, a temperature-sensing hole through which the cooling water always flows is provided by bypassing the check valve and the on-off valve. When the water temperature rises, the on-off valve opens the fluid passage so that the hot water flows into the heat storage tank.

  However, since the heat storage tank of the prior application increases the flow rate of the cooling water flowing through the temperature sensing hole, it affects the performance of the waste heat utilization system, so that only a very small flow rate can flow. For this reason, the passage area of the temperature sensing hole is small, and the temperature sensing hole is clogged by foreign matter mixed in and generated in the cooling water, and the on-off valve may not be able to operate according to the temperature.

  In consideration of the influence on the performance of the waste heat utilization system, the cooling water flowing into the heat storage tank when the water temperature rises may have to be made a minute flow rate. In that case, the passage area of the recovery hole through which the cooling water flows when the on-off valve is opened becomes small, the foreign material in the cooling water tends to clog the recovery hole, and the cooling water flows even if the on-off valve opens. The problem of not occurring.

  The present invention has been made in view of the above points, and it is an object of the present invention to automatically remove foreign matter even when the foreign matter is clogged in a passage for constantly flowing a temperature sensing fluid to the temperature sensing portion of the on-off valve. And

  The present invention relates to a check tank (13) that opens and closes a fluid passage (1222, 1223) in contact with and away from a seat surface (1232), and a fluid passage (1222) according to the temperature of the fluid in a heat storage tank that retains and stores fluid. , 1223), and a temperature sensing groove (1233) formed on the seat surface (1232) and bypassing the check valve (13) and the on-off valve (14) and allowing fluid to flow constantly. It is characterized by providing.

  In this way, even if the temperature sensing groove (1233) is clogged with foreign matter clogged while the check valve (13) is closed, when the check valve (13) is opened, the vicinity of the temperature sensing groove (1233) is maintained. Since the foreign matter is pushed away by the flowing fluid, the foreign matter is automatically removed.

  In this case, a recovery groove (1234) through which a fluid flows when the on-off valve (14) is opened can be formed in the seat surface (1232).

  In this way, even if the collecting groove (1234) is clogged with the check valve (13) closed, the fluid flowing in the vicinity of the collecting groove (1234) when the check valve (13) is opened. As a result, the foreign matter is pushed away, so that the foreign matter is automatically removed.

  Further, the on-off valve (14) can be configured to open and close the fluid passages (1222, 1223) by contacting and separating from the check valve (13).

  By doing so, the on-off valve (14) opens and closes the fluid passages (1222, 1223) without sliding with the check valve (13), so that durability can be improved.

  In addition, the valve body (130) may include two lips (1302, 1303) that are concentrically arranged and contact and separate from the seat surface (1232).

  In this way, since the two lips (1302, 1303) are in contact with the seat surface (1232) when the check valve (13) is closed, the posture of the valve body (130) with respect to the seat surface (1232) is stabilized. Good sealing properties can be obtained.

  Further, a recovery hole (1235) through which a fluid flows when the on-off valve (14) is opened may be configured such that the opening area of the recovery hole (1235) is adjusted by the check valve (13). it can.

  In this way, even if the recovery hole (1235) is clogged with foreign matter when the opening area of the recovery hole (1235) is small, the foreign matter is pushed away when the opening area of the recovery hole (1235) becomes large. Foreign matter is automatically removed.

  Further, the opening area of the recovery hole (1235) can be adjusted to the minimum when the check valve (13) closes the fluid passages (1222, 1223).

  In this way, when the check valve (13) is closed and the on-off valve (14) is open, the fluid flowing into the heat storage tank can be set to a minute flow rate.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a diagram showing an overall configuration of a waste heat utilization system for an internal combustion engine using a heat storage tank according to a first embodiment of the present invention.

  In FIG. 1, a vehicle (not shown) includes an internal combustion engine 1 as a travel drive source. The internal combustion engine 1 is water-cooled, and a water jacket (not shown) for circulating cooling water is formed in the cylinder block 1a and the cylinder head 1b.

  Cooling water that has become a high temperature by cooling the internal combustion engine 1 is cooled by the radiator 2. As is well known, the radiator 2 cools the cooling water by exchanging heat between the cooling water and the outside air. The internal combustion engine 1 and the radiator 2 are connected by a main cooling water circuit 3 that forms a closed circuit between the internal combustion engine 1 and the radiator 2.

  The main coolant circuit 3 is provided with a first pump 4 that is mechanically driven by the power of the internal combustion engine 1 and circulates coolant in the main coolant circuit 3 and the like. In the main cooling water circuit 3, the cooling water is circulated from the cylinder head 1 b to the cylinder block 1 a via the radiator 2.

  In the middle of the main cooling water circuit 3, a bypass circuit 5 that bypasses the radiator 2 and distributes the cooling water is connected in parallel to the main cooling water circuit 3. The thermostat 6 provided at the connection between the main cooling water circuit 3 and the bypass circuit 5 performs switching control between the case where the cooling water is circulated through the bypass circuit 5 and the case where the cooling water is circulated through the radiator 2. Incidentally, switching between the circuits 3 and 5 is normally controlled to flow to the radiator 2 when the cooling water temperature is about 80 ° C. or higher, and to flow to the bypass circuit 5 when the cooling water temperature is lower than about 80 ° C. Is done.

  The vehicle is equipped with an air conditioner 7 that air-conditions the passenger compartment. The air conditioner 7 includes an air conditioning casing 7a that forms a passage of air blown into the room, and a blower 7b that blows air into the room is disposed on the upstream side of the air flow in the air conditioning casing 7a.

  An evaporator 7c for cooling the air blown from the blower 7b is disposed on the downstream side of the air flow of the blower 7b in the air conditioning casing 7a. The evaporator 7c is a refrigerant evaporator of a known vapor compression refrigerator.

  A heater core 7d that heats the air blown from the blower 7b by using cooling water (hot water) of the internal combustion engine 1 as a heat source is disposed on the downstream side of the air flow of the evaporator 7c in the air conditioning casing 7a.

  In the air conditioning casing 7a, air is blown into the air inlet side of the heater core 7d by adjusting the amount of air passing through the heater core 7d and the amount of air flowing around the heater core 7d to the indoor side (downstream side). An air mix door 7e for adjusting the temperature of the air is provided. The air mix door 7e is driven by an electric motor.

  The internal combustion engine 1 and the heater core 7d are connected by a heating coolant circuit 8 that forms a closed circuit between the internal combustion engine 1 and the heater core 7d. More specifically, one end of the heating coolant circuit 8 is connected to the water jacket of the cylinder head 1 b, and the other end of the heating coolant circuit 8 is between the first pump 4 and the thermostat 6. 3, and is connected to the water jacket of the cylinder block 1 a via the first pump 4.

  A two-way valve 9 that is driven by an electric motor to open and close the heating coolant circuit 8 is disposed in the middle of the heating coolant circuit 8, more specifically, between the water jacket of the cylinder head 1 b and the heater core 7 d. Has been. In the cooling water circuit 8 for heating, the cooling water flows into the heater core 7d after passing through the two-way valve 9 from the cylinder head 1b.

  In the cooling water circuit 8 for heating, between the water jacket of the cylinder head 1b and the two-way valve 9, a water temperature sensor Sw that outputs an electric signal corresponding to the cooling water temperature is disposed.

  A heat storage coolant circuit 10 is branched from the middle of the heating coolant circuit 8. The heat storage cooling water circuit 10 branches from the cooling water flow downstream of the heater core 7d in the heating cooling water circuit 8 and is connected to the water jacket of the cylinder block 1a.

  The heat storage coolant circuit 10 is provided with a second pump 11 constituted by an electric motor and a pump driven by the electric motor, in other words, a second pump 11 that operates using electricity as an energy source. And by the action | operation of the 2nd pump 11, a cooling water is pumped toward the water jacket of the cylinder block 1a.

  In the heat storage cooling water circuit 10, a heat storage tank 12 that retains and stores the cooling water is disposed downstream of the second pump 11 in the cooling water flow. In the heat storage tank 12, a check valve 13 that allows only the flow in the cooling water pumping direction of the second pump 11 and the check valve 13 are arranged in parallel, and heat storage is performed according to the temperature of the cooling water. An opening / closing valve 14 for opening and closing the cooling water passage in the tank 12 is provided.

  The electronic control unit 15 includes a well-known microcomputer including a CPU, ROM, RAM, and the like (not shown), and performs arithmetic processing according to a program stored in the microcomputer. Specifically, an output signal of the water temperature sensor Sw, An operation position signal of a key switch (not shown) and various information for determining a stop condition and a restart condition of the internal combustion engine 1 are input. Based on these input signals, the internal combustion engine 1 and the air mix door 7e, the two-way valve 9, the second pump 11 and the like are controlled.

  2 is a cross-sectional view showing a specific configuration of the heat storage tank 12 of FIG. 1, and FIG. 3 is a cross-sectional view showing operating states of the check valve 13 and the on-off valve 14 in the heat storage tank 12 of FIG.

  As shown in FIG. 2, the heat storage tank 12 includes a tank body 121 that retains and stores the cooling water. The tank body 121 includes an inner cylinder 1211 and an outer cylinder 1212 that are formed in a bottomed cylindrical shape with a material having excellent corrosion resistance such as stainless steel, and is in a substantially vacuum state between the inner cylinder 1211 and the outer cylinder 1212. A heat insulating space 1213 is formed, and a storage portion 1214 for storing cooling water is formed inside the inner cylinder 1211.

  A resin-made first housing 122 is inserted into the tank body 121 so as to close the opening of the tank body 121. An O-ring 1221 that seals between the inner cylinder 1211 and the first housing 122 is disposed between the inner cylinder 1211 and the first housing 122.

  A resin-made second housing 123 is inserted into an end of the first housing 122 on the storage portion 1214 side. The first housing 122 is formed with a cooling water inflow passage 1222 that allows the heat storage cooling water circuit 10 (see FIG. 1) on the second pump 11 (see FIG. 1) side and the storage portion 1214 to communicate with each other. The housing 122 and the second housing 123 are formed with a cooling water outflow passage 1223 that allows the heat storage cooling water circuit 10 on the cylinder block 1a (see FIG. 1) side and the reservoir 1214 to communicate with each other. The cooling water inflow passage 1222 and the cooling water outflow passage 1223 correspond to the fluid passage of the present invention.

  A pipe 124 is attached to the end of the second housing 123 on the storage portion 1214 side. The cooling water outflow passage 1223 and the reservoir 1214 are communicated with each other by the pipe 124.

  Further, a substantially cup-shaped mixing prevention plate 125 is attached to the end of the first housing 122 on the storage portion 1214 side so as to surround the end of the cooling water inflow passage 1222 on the storage portion 1214 side. A plurality of outflow holes 1251 are formed in the mixing prevention plate 125, and the cooling water flowing in from the cooling water inflow passage 1222 flows into the storage portion 1214 side through the outflow holes 1251.

  As shown in FIG. 3, the cooling water outflow passage 1223 is branched into two cooling water outflow passages 1223 a and 1223 b in parallel in the second housing 123. The two cooling water outflow passages 1223a and 1223b are separated by a case 140 of the on-off valve 14, which will be described later, and are arranged coaxially. A cylindrical second cooling water is provided inside the cylindrical first cooling water outflow passage 1223a. A water outflow passage 1223b is located.

  The first cooling water outflow passage 1223a is provided with a check valve 13 that allows only the flow of cooling water from the cooling water inflow passage 1222 side to the cooling water outflow passage 1223 side. The check valve 13 is a rubber (for example, EPDM) annular check valve body that opens and closes the first cooling water outflow passage 1223a by contacting and separating from the check valve seat surface 1232 formed in the second housing 123. 130 and a conical coil spring 131 that urges the check valve body 130 in the valve closing direction. Further, the check valve body 130 is integrated with the case 140 of the on-off valve 14.

  The second cooling water outflow passage 1223b is provided with an on-off valve 14 that opens and closes the second cooling water outflow passage 1223b according to the temperature of the cooling water. The on-off valve 14 has a cylindrical case 140 made of resin that is slidably supported by a rib 1231 formed in the second housing 123, and the volume increases as the temperature increases, and the temperature becomes a threshold value. And a rod 142 that is fixed to the case 140 and moves in and out of the temperature sensing portion 141 in response to the volume change of the thermowax. And an opening / closing valve body 143 that is fixed to the outer periphery of the temperature sensing portion 141 with a washer and that opens and closes the second cooling water outflow passage 1223b by contacting and separating from the opening / closing valve seat surface 1401 formed in the case 140. It comprises a conical coil spring 144 that urges the valve body 143 in the valve closing direction.

  One normally open temperature-sensitive groove 1233 is formed in a portion of the check valve seat surface 1232 of the second housing 123 where the outer peripheral side end face of the check valve valve body 130 comes in contact with and separates from. The temperature sensing groove 1233 is disposed in series with the first cooling water outflow passage 1223a, and the cooling water always flows by bypassing the check valve 13 and the on-off valve 14. Incidentally, the temperature-sensitive groove 1233 can have, for example, a rectangular shape, a triangular shape, a semicircle, or the like as a cross-sectional shape of a surface orthogonal to the cooling water flow direction at the temperature-sensitive groove 1233 portion.

  One recovery groove 1234 is formed in a portion of the check valve seat surface 1232 of the second housing 123 where the inner peripheral side end surface of the check valve valve body 130 comes into contact with and separates from. The recovery groove 1234 is arranged in series with the second cooling water outflow passage 1223b, and the cooling water flows by bypassing the check valve 13 when the on-off valve 14 is opened. Incidentally, the cross-sectional shape of the surface of the recovery groove 1234 perpendicular to the coolant flow direction at the recovery groove 1234 can be set to, for example, a rectangle, a triangle, a semicircle, or the like.

  Next, the operation of the waste heat utilization system according to this embodiment will be described. First, the preheat mode is executed immediately before the internal combustion engine 1 is started. That is, the electronic control unit 15 opens the two-way valve 9 for a predetermined time when the key switch is operated to the start position when the internal combustion engine 1 is stopped and the cooling water temperature is equal to or lower than the set temperature. In the valve state, the heating coolant circuit 8 is opened and the second pump 11 is operated to execute the preheat mode.

  At this time, as shown in FIG. 3A, the check valve 13 is opened away from the check valve seat surface 1232 by the discharge pressure of the second pump 11. Therefore, as indicated by arrows in FIG. 1, the cooling water circulates in the order of the heat storage tank 12 → the cylinder block 1a → the cylinder head 1b → the two-way valve 9 → the heater core 7d → the second pump 11 → the heat storage tank 12, and the heat storage Cooling water circulates in the order of the tank 12 → the cylinder block 1 a → the first pump 4 → the second pump 11 → the heat storage tank 12, whereby the internal combustion engine 1 is heated by the high-temperature cooling water stored in the heat storage tank 12. Is done. Therefore, warm-up of the internal combustion engine 1 can be promoted, and vehicle fuel consumption and exhaust performance can be improved. Incidentally, the internal combustion engine 1 is started after completion of the preheat mode.

  Next, during the warming-up operation of the internal combustion engine 1, the first pump 4 is activated and the second pump 11 is stopped. The first pump 4 → the cylinder block 1a → the cylinder head 1b → the bypass circuit 5 → the thermostat 6 → the second Cooling water circulates in the order of 1 pump 4.

  Further, in the heat storage tank 12, since the discharge pressure of the first pump 4 acts via the cylinder block 1a and the heat storage cooling water circuit 10, the check valve 13 is closed and the cooling water temperature is low. Therefore, the on-off valve 14 is also closed. However, as indicated by arrows in FIG. 3B, the cooling water flows from the cooling water outflow passage 1223 side through the temperature sensing groove 1233 toward the storage portion 1214. The cooling water flow rate at this time is adjusted by the passage area of the temperature sensing groove 1233. Specifically, the cooling water flow rate is set to a minute flow rate so that the thermo wax of the temperature sensing unit 141 can sense the temperature and does not affect the heater performance or the like. Has been.

  Thereafter, when the warm-up of the internal combustion engine 1 proceeds and the coolant temperature reaches a threshold value, as shown in FIG. Is moved away from the on-off valve seat surface 1401 to open the second cooling water outflow passage 1223b.

  For this reason, a part of the high-temperature cooling water sent from the first pump 4 is stored in the cylinder block 1a → the heat storage cooling water circuit 10 → the cooling water outflow passage 1223 → the second cooling water outflow passage 1223b → the recovery groove 1234 → storage. It flows in the order of the part 1214. Therefore, the low-temperature cooling water that has flowed into the heat storage tank 12 during the preheat mode is replaced with the high-temperature cooling water, and the high-temperature cooling water is stored in the heat storage tank 12. The cooling water flow rate at this time is adjusted by the passage area of the recovery groove 1234 and set to a minute flow rate that does not affect the heater performance or the like.

  By the way, since the temperature sensitive groove 1233 and the recovery groove 1234 have a small passage area, there is a possibility that the temperature sensitive groove 1233 and the recovery groove 1234 may be clogged with the cooling water when the cooling water flows when the on-off valve 14 is closed. In this case, in the preheat mode, as shown in FIG. 3A, the check valve body 130 moves away from the check valve seat surface 1232 and a large amount of cooling water flows, so foreign matter is pushed away by the cooling water. .

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 4 is a cross-sectional view showing a main part of the heat storage tank 12 according to the second embodiment, and FIG. 5 is a cross-sectional view showing operating states of the check valve 13 and the on-off valve 14 in the heat storage tank 12 of FIG.

  This embodiment is different from the first embodiment in the configuration of the check valve 13 and the on-off valve 14. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the present embodiment, a cylindrical case 140 of the on-off valve 14 is slidably inserted into the annular check valve valve body 130. One recovery groove 1401 is formed on the outer peripheral surface of the case 140, and the recovery groove 1401 and the cooling water outflow passage 1223 are slid on the inner peripheral surface of the check valve body 130 by sliding the outer peripheral surface of the case 140. An inner peripheral lip 1301 that opens and closes the gap is formed.

  A temperature sensing part 141 is disposed inside the case 140, and the case 140 and the temperature sensing part 141 are sealed with a rubber packing 145. The case 140 and the temperature sensing part 141 are urged by a coil spring 144 toward the check valve seat surface 1232 side of the second housing 123, and one end of the rod 142 is in contact with the second housing 123.

  In the above configuration, in the preheat mode, as shown in FIG. 5A, the check valve 13 is moved from the check valve seat surface 1232 by the discharge pressure of the second pump 11 (see FIG. 1). Open away. Then, the high-temperature coolant stored in the heat storage tank 12 (see FIG. 1) is sent to the internal combustion engine 1 (see FIG. 1) side.

  During the warm-up operation of the internal combustion engine 1, as shown in FIG. 5B, the check valve 13 is closed and from the cooling water outflow passage 1223 side to the storage portion 1214 through the temperature sensing groove 1233. Cooling water flows.

  Thereafter, when the warm-up of the internal combustion engine 1 proceeds and the coolant temperature reaches a threshold value, as shown in FIG. 5 (c), the opening / closing valve 14 causes the case 140 and the temperature sensing part 141 to be non-returned by the expansion of the thermowax. It is moved in a direction away from the valve seat surface 1232. Thereby, the case 140 and the check valve valve body 130 are relatively displaced, and the recovery groove 1401 and the cooling water outflow passage 1223 communicate with each other. Therefore, the cooling water flows from the cooling water outflow passage 1223 side toward the storage portion 1214 through the recovery groove 1401.

  If the temperature sensing groove 1233 or the collection groove 1234 is clogged with foreign matter, the cooling water flowing in the vicinity of the temperature sensing groove 1233 or the collection groove 1234 when the check valve 13 is opened as shown in FIG. The foreign matter in the temperature sensitive groove 1233 and the recovery groove 1234 is pushed away.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 6 is a cross-sectional view showing the operating states of the check valve 13 and the on-off valve 14 in the heat storage tank according to the third embodiment, and FIG. 7 is an enlarged cross-sectional view of part A in FIG.

  This embodiment is different from the second embodiment in the configuration of the check valve 13. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 2nd Embodiment, and the description is abbreviate | omitted.

  In this embodiment, two end surface lips 1302 and 1303 that are in contact with and away from the check valve seat surface 1232 are provided concentrically on the end surface of the annular check valve valve body 130. In addition, one recovery groove 1234 is formed in a portion of the check valve seat surface 1232 of the second housing 123 where the inner end face lip 1302 comes into contact with and separates from.

  In the above configuration, in the preheat mode, as shown in FIG. 6A, the check valve 13 is moved from the check valve seat surface 1232 by the discharge pressure of the second pump 11 (see FIG. 1). Open away. Then, the high-temperature coolant stored in the heat storage tank 12 (see FIG. 1) is sent to the internal combustion engine 1 (see FIG. 1) side.

  During the warm-up operation of the internal combustion engine 1, as shown in FIG. 6B, the check valve 13 is closed, and from the cooling water outflow passage 1223 side through the temperature sensing groove 1233 (FIG. 1B). Cooling water flows toward (see). When the check valve 13 is closed in this way, the two concentric end face lips 1302 and 1303 are in contact with the check valve seat surface 1232, so that the check valve valve body 130 is not in contact with the check valve seat surface 1232. The posture is stable and good sealability can be obtained.

  Thereafter, when the warm-up of the internal combustion engine 1 proceeds and the cooling water temperature reaches a threshold value, as shown in FIG. 6C, the opening / closing valve 14 causes the case 140 and the temperature sensing part 141 to be non-returned by the expansion of the thermowax. It is moved in a direction away from the valve seat surface 1232. Thereby, the case 140 and the check valve valve body 130 are relatively displaced, and the recovery groove 1401 of the case 140 and the cooling water outflow passage 1223 communicate with each other. Therefore, the cooling water from the cooling water outflow passage 1223 side flows into the storage portion 1214 through the recovery groove 1401 of the case 140 and the recovery groove 1234 of the check valve seat surface 1232.

  If the temperature sensing groove 1233 or both recovery grooves 1234, 1401 are clogged with foreign matter, the temperature sensing groove 1233 or both recovery grooves 1234, 1401 when the check valve 13 is opened as shown in FIG. The foreign material in the temperature sensitive groove 1233 and the two collecting grooves 1234 and 1401 is pushed away by the cooling water flowing in the vicinity.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. FIG. 8 is a cross-sectional view showing a main part of the heat storage tank 12 according to the fourth embodiment, and FIG. 9 is a cross-sectional view showing operating states of the check valve 13 and the on-off valve 14 in the heat storage tank 12 of FIG.

  This embodiment is different from the first embodiment in the configuration of the check valve 13 and the on-off valve 14. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the present embodiment, a recovery hole 1235 for bypassing the check valve 13 and flowing cooling water when the on-off valve 14 is opened is provided. The recovery hole 1235 is formed by the second housing 123 and the third housing 126 made of resin.

  The check valve body 130 of the check valve 13 can adjust the opening area of the disk-shaped flange 1304 that opens and closes the cooling water outflow passage 1223 by contacting and separating from the check valve seat surface 1232 and the recovery hole 1235. It consists of a cylindrical tube portion 1305.

  The on-off valve body 143 of the on-off valve 14 is fixed to the outer peripheral part of the temperature sensing part 141, and opens and closes the collection hole 1235 by contacting and separating from the on-off valve seat surface 1236 formed in the second housing 123. ing. The temperature sensing portion 141 and the on-off valve body 143 of the on-off valve 14 are urged toward the valve closing direction by a coil spring 144, and one end of the rod 142 is in contact with the second housing 123.

  FIG. 10 is a view taken in the direction of the arrow B in FIG. 9B. As shown in FIG. 10, when the check valve 13 is closed, a part of the recovery hole 1235 is blocked by the cylindrical portion 1305. It is supposed to be. When the check valve 13 is closed, the opening area of the recovery hole 1235 is adjusted to the minimum.

  In the above-described configuration, in the preheat mode, as shown in FIG. 9A, the check valve 13 is configured so that the flange 1304 of the check valve valve body 130 is caused by the discharge pressure of the second pump 11 (see FIG. 1). The valve is opened away from the seat surface 1232. Then, the high-temperature coolant stored in the heat storage tank 12 (see FIG. 1) is sent to the internal combustion engine 1 (see FIG. 1) side. At this time, the cylindrical portion 1305 of the check valve body 130 does not block the recovery hole 1235, and the opening area of the recovery hole 1235 is maximized.

  During the warm-up operation of the internal combustion engine 1, as shown in FIG. 9B, the check valve 13 and the on-off valve 14 are closed, and from the cooling water outflow passage 1223 side through the temperature sensing groove 1233, Cooling water flows toward 1214.

  Thereafter, when the warm-up of the internal combustion engine 1 proceeds and the coolant temperature reaches a threshold value, as shown in FIG. 9C, the on-off valve 14 has a temperature sensing part 141 and an on-off valve body 143 due to the expansion of the thermowax. Is moved away from the on-off valve seat surface 1236, and the recovery hole 1235 is opened. Therefore, the cooling water from the cooling water outflow passage 1223 side flows through the recovery hole 1235 to the storage unit 1214. At this time, since the opening area of the collection hole 1235 is adjusted to the minimum, the cooling water flow rate can be set to a minute flow rate that does not affect the heater performance or the like.

  When the temperature sensing groove 1233 is clogged with foreign matter, or when foreign matter is clogged at the opening end of the recovery hole 1235 on the check valve valve body 130 side, as shown in FIG. When the valve is opened, the foreign material in the temperature sensing groove 1233 and the recovery hole 1235 is pushed away by the cooling water flowing in the vicinity of the opening end of the temperature sensing groove 1233 and the recovery hole 1235 on the check valve valve body 130 side.

It is a figure showing the whole waste heat utilization system of an internal-combustion engine using the heat storage tank concerning a 1st embodiment of the present invention. It is sectional drawing which shows the specific structure of the thermal storage tank 12 of FIG. It is sectional drawing which shows the operating state of the non-return valve 13 and the on-off valve 14 in the thermal storage tank 12 of FIG. It is sectional drawing which shows the principal part of the thermal storage tank 12 which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the operating state of the non-return valve 13 and the on-off valve 14 in the thermal storage tank 12 of FIG. It is sectional drawing which shows the operating state of the non-return valve 13 and the on-off valve 14 in the thermal storage tank which concerns on 3rd Embodiment of this invention. It is an expanded sectional view of the A section of FIG. It is sectional drawing which shows the principal part of the thermal storage tank 12 which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the operating state of the non-return valve 13 and the on-off valve 14 in the thermal storage tank 12 of FIG. It is a B arrow view of FIG.9 (b).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 13 ... Check valve, 14 ... On-off valve, 121 ... Tank main body, 122, 123 ... Housing, 1222 ... Cooling water inflow passage (fluid passage), 1223 ... Cooling water outflow passage (fluid passage), 1232 ... Seat surface, 1233 ... temperature sensing groove.

Claims (8)

In a heat storage tank comprising a tank main body (121) for storing and storing fluid and a housing (122, 123) in which fluid passages (1222, 1223) communicating with the tank main body (121) are formed.
A check valve (13) that opens and closes the fluid passages (1222, 1223) in contact with and separates from the seat surface (1232) formed in the housing (122, 123) and permits only the flow of fluid in one direction. )When,
An on-off valve (14) for opening and closing the fluid passages (1222, 1223) according to the temperature of the fluid;
A heat storage tank, comprising: a temperature sensing groove (1233) formed on the seat surface (1232), through which the check valve (13) and the on-off valve (14) bypass and the fluid always flows. The heat storage tank according to claim 1, wherein a recovery groove (1234) through which a fluid flows when the on-off valve (14) is opened is formed in the seat surface (1232). 3. The heat storage tank according to claim 1, wherein the on-off valve (14) is configured to open and close the fluid passage (1222, 1223) by contacting and separating from the check valve (13). The heat storage tank according to claim 1, wherein a recovery groove (1401) through which fluid flows when the on-off valve (14) is opened is formed on the on-off valve (14). The check valve (13) includes an annular valve body (130),
The on-off valve (14) is disposed inside the valve body (130),
The collection groove (1401) is formed on the outer peripheral surface of the on-off valve (14),
The valve body (130) and the on-off valve (14) are relatively displaced while the inner peripheral surface of the valve body (130) and the outer peripheral surface of the on-off valve (14) slide, so that the The heat storage tank according to claim 4, wherein the fluid passage (1222, 1223) including the recovery groove (1401) is opened and closed. The heat storage tank according to claim 5, wherein the valve body (130) includes two lips (1302, 1303) arranged concentrically and contacting and separating from the seat surface (1232). A recovery hole (1235) through which fluid flows when the on-off valve (14) is opened is configured such that the opening area of the recovery hole (1235) is adjusted by the check valve (13). The heat storage tank according to claim 1, wherein The heat storage according to claim 7, wherein the opening area of the recovery hole (1235) is adjusted to a minimum when the check valve (13) closes the fluid passage (1222, 1223). tank.

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