JP6844518B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger having a plurality of tubes through which a fluid flows inside and a tank for distributing and collecting the fluid in the plurality of tubes.

A heater core is known in which a pair of tanks are provided at both ends of a plurality of tubes, and the hot water inlet of the inlet tank and the hot water outlet of the outlet tank are arranged at the same end. In the heater core having such a configuration, the pressure loss of hot water increases at a portion away from the inlet of the inlet tank and the flow rate of hot water decreases, so that the flow rate of hot water in each tube tends to be uneven. As a result, a temperature distribution is generated in the heater core, which may lead to deterioration of the air conditioning feeling.

On the other hand, Patent Document 1 proposes that a plate-shaped member is arranged inside the inlet tank, and the plate-shaped member closes a part of the opening area of a predetermined number of tubes from the inflow port side. As a result, the flow rate of hot water can be secured even at a portion away from the inlet of the inlet tank.

Japanese Patent No. 4830918

In recent years, the demand for improving the fuel efficiency of vehicles has been increasing, and it is expected that the need for early engine warm-up by reducing the flow rate of cooling water will increase. When the cooling water flowing into the heater core has an extremely low flow rate, the cooling water flow rate of several tubes near the inlet of the inlet tank becomes extremely large. Therefore, in the configuration of Patent Document 1, most of the cooling water flowing into the inlet tank flows in from the portion of the tube near the inlet that is not blocked by the plate-shaped member, and as a result, a temperature distribution occurs in the heater core.

In view of the above points, it is an object of the present invention to suppress the occurrence of temperature distribution in a region where the fluid flow rate is low in a heat exchanger provided with a pair of tanks at both ends of a plurality of tubes.

In order to achieve the above object, in the invention according to claim 1, a core portion (23) having a flat cross section and a plurality of tubes (22) through which a fluid flows inside are laminated, and both ends of the plurality of tubes. A pair of tanks (25, 26) connected to the open end (22a) and a closing member (34) disposed inside at least one of the pair of tanks.
The pair of tanks are provided with fluid passage ports (27, 28) at the ends on the same side in the stacking direction of the tubes, respectively, and the tubes have a length in the longitudinal direction of the open ends. Is longer than the inner diameter of the fluid passage port, and the closing member closes at least a part of the opening end portion of a predetermined number of tubes arranged on the side close to the fluid passing port, and the closing member opens. A movable part (36) capable of changing the widthwise length of the closing member along the longitudinal direction of the end portion into a first state longer than the inner diameter of the fluid passage port and a second state shorter than the inner diameter of the fluid passage port. ).

According to the present invention, the area of the closing member is expanded at the portion where the movable portion is provided, and the closing rate of the opening end portion of the tube is increased. As a result, when the fluid flow rate is extremely low, the inflow of the fluid into the tube can be greatly restricted by the moving portion, and the fluid flow rate of each tube can be made uniform. As a result, it is possible to suppress the generation of a temperature distribution in the air after heat exchange in the heat exchanger.

Further, by changing the movable portion to the second state, the closing member can be inserted into the tank through the fluid passage port and installed. Further, after the closing member is installed in the tank, the movable portion is in the first state, so that the closing rate of the opening end portion of the tube corresponding to the movable portion can be increased.

The reference numerals in parentheses of each of the above components indicate the correspondence with the specific means described in the embodiments described later.

It is sectional drawing of the air-conditioning unit of the vehicle air-conditioning apparatus of 1st Embodiment. It is a front view of a heater core. It is an enlarged sectional view of a part of a heater core. FIG. 3 is a sectional view taken along line IV-IV of FIG. It is a perspective view which shows the inside of the inlet side of an inlet tank. It is a top view which shows the state which the movable part of a closing member is exposed. FIG. 6 is a sectional view taken along line VII-VII of FIG. It is a top view which shows the state which the movable part of a closing member is housed. FIG. 8 is a cross-sectional view taken along the line IX-IX of FIG. It is a top view which shows the closing member and a tube in the state which the closing member is assembled in the inlet tank, and when the hot water flow rate is an extremely low flow rate. FIG. 10 is a cross-sectional view taken along the line XI-XI of FIG. It is a top view which shows the closing member and a tube when the hot water flow rate is a normal flow rate. FIG. 12 is a cross-sectional view taken along the line XIII-XIII of FIG. It is a graph which shows the hot water flow rate of each tube when the hot water flowing into an inlet tank has an extremely low flow rate. It is a graph which shows the hot water flow rate of each tube when the hot water flowing into an inlet tank is a normal flow rate. It is a top view which shows the closing member of 2nd Embodiment. 16 is a cross-sectional view taken along the line XVII-XVII of FIG. It is sectional drawing which shows the state which the movable part of the closing member of 2nd Embodiment is folded. It is sectional drawing which shows the state which the opening of the closing member of 2nd Embodiment is closed. It is sectional drawing which shows the state which the opening of the closing member of 2nd Embodiment is open. It is sectional drawing which shows the state which the opening of the closing member of 3rd Embodiment is closed. It is sectional drawing which shows the state which the opening of the closing member of 3rd Embodiment is open.

(First Embodiment)
In this embodiment, the heat exchanger of the present invention is applied to the heater core of the air conditioning unit 10 of the vehicle air conditioner. The arrows in the up, down, front, and back directions of FIG. 1 indicate the direction in which the air conditioning unit 10 is mounted on the vehicle.

The vehicle air conditioner of the present embodiment has a so-called semi-centered layout, and the air conditioner unit 10 is arranged in a substantially central portion in the left-right direction of the vehicle inside the instrument panel in front of the vehicle interior.

A blower unit (not shown) that blows air to the air conditioning unit 10 is offset-arranged on the side of the air conditioning unit 10 (that is, on the front side of the paper). The blower unit includes an inside / outside air switching box that switches between inside and outside air, and a centrifugal electric blower fan that blows air (inside air or outside air) sucked from the inside / outside air switching box toward the air conditioning unit 10. ..

The air conditioning unit 10 includes an air conditioning case 11. The evaporator 12 and the heater core 13 are integrally built in the air conditioning case 11. The air-conditioning case 11 is made of a resin molded product having elasticity like polypropylene and excellent in strength. The air conditioning case 11 is composed of a plurality of divided cases. These split cases are integrally connected by fastening members such as metal spring clips and screws.

In the air conditioning case 11, the air inlet 14 is formed on the side surface of the most front side portion of the vehicle. The air blown from the blower unit described above flows into the air inlet 14.

The evaporator 12 is arranged in the air conditioning case 11 immediately after the air inlet 14. The entire amount of blown air flowing in from the air inlet 14 passes through the evaporator 12. The evaporator 12 is a cooling heat exchanger that cools the blown air by the latent heat of vaporization of the refrigerant in the refrigeration cycle.

A heater core 13 is arranged on the downstream side of the air flow of the evaporator 12 (that is, the rear side of the vehicle). The heater core 13 is a heating heat exchanger that heats the air that has passed through the evaporator 12. High-temperature hot water (engine cooling water) flows inside the heater core 13, and the hot water is used as a heat source to heat the air. In this embodiment, LLC (antifreeze) is used as the engine cooling water.

In the air conditioning case 11, a cold air bypass passage 15 is formed above the heater core 13. An air mix door 16 is rotatably arranged on the downstream side (rear side of the vehicle) of the evaporator 12. The air mix door 16 adjusts the air volume ratio between the air passing through the cold air bypass passage 15 and the air passing through the heater core 13, and adjusts the temperature of the blown air into the vehicle interior to a desired temperature.

Inside the air conditioning case 11, there are a face opening / closing door 17a that opens and closes a passage that communicates with the face outlet 17 that blows air toward the upper body of the occupant, and a passage that communicates with the defroster outlet 19 that blows air toward the front window glass. A defroster opening / closing door 19a that opens / closes and a foot opening / closing door 21a that opens / closes a passage communicating with a foot outlet 21 that blows air toward the feet of an occupant are provided.

Next, the heater core 13 will be described in detail with reference to FIGS. 2 to 4. In FIGS. 2 and 3, the left-right direction in the figure is the tube stacking direction, and the vertical direction in the figure is the tube longitudinal direction. In FIG. 4, the left-right direction in the figure is the tube stacking direction, and the vertical direction in the figure is the tube width direction. The tube width direction is the cross-sectional major axis direction of the tube 22.

As shown in FIG. 2, the heater core 13 includes a core portion 24 having a plurality of tubes 22 through which cooling water (hot water) flows and fins 23 provided between the tubes 22. The tube 22 has a flat cross section, and a plurality of tubes 22 are laminated and arranged. The fins 23 are formed in a wavy shape to promote heat exchange between air and hot water flowing inside the tube 22. The heater core 13 corresponds to the heat exchanger of the present invention, and the hot water corresponds to the fluid of the present invention.

Both ends of the tube 22 in the longitudinal direction of the tube are open end portions 22a. The tube opening end 22a has an oval shape, and the longitudinal direction of the tube opening end 22a coincides with the tube width direction. Hereinafter, the opening end portion 22a of the tube 22 is also referred to as a tube opening end portion 22a.

The tube opening end 22a is provided with header tanks 25 and 26 communicating with each tube 22. The header tanks 25 and 26 include an inlet tank 25 that distributes hot water to each tube 22 and an outlet tank 26 that collects hot water that has passed through each tube 22. In this embodiment, the inlet tank 25 is arranged below and the outlet tank 26 is arranged above. Therefore, inside the tube 22, hot water flows from the lower side to the upper side. The inlet tank 25 and the outlet tank 26 correspond to the pair of tanks of the present invention.

The inlet tank 25 is provided with an inflow port 27 for allowing hot water to flow into the heater core 13. The outlet tank 26 is provided with an outlet 28 that allows hot water that has undergone heat exchange to flow out of the heater core 13. The inflow port 27 and the outflow port 28 are provided at the same side (that is, the left side in FIG. 2) ends of the tanks 25 and 26, respectively. As shown in FIG. 4, the inner diameter B of the inflow port 27 is shorter than the longitudinal length A of the tube opening end portion 22a. The inflow port 27 and the outflow port 28 correspond to the fluid passage port of the present invention.

An insert 29 is provided at the end of the core portion 24 in parallel with the longitudinal direction of the tube. The insert 29 is joined to both tanks 25 and 26 to reinforce the core portion 24.

The inlet tank 25 and the outlet tank 26 have a core plate 30 in which a tube insertion hole 30a into which the tube 22 is inserted is formed, and a tank main body 31 that is joined to the core plate 30 to form a space inside the tank. ..

The core plate 30 has a rectangular flat plate shape. The tube 22 is inserted into the core plate 30 so that the tube opening end 22a slightly protrudes from the tube insertion hole 30a. Insert insertion holes 30b into which the insert 29 is inserted are formed at both ends of the core plate 30 in the longitudinal direction (that is, the tube stacking direction).

A cap 32 is provided on one end side of the inlet tank 25 and the outlet tank 26. The inflow port 27 is formed in the cap 32 provided in the inlet tank 25, and the outflow port 28 is formed in the cap 32 provided in the outlet tank 26. The inflow port 27 and the outflow port 28 are formed in a cylindrical shape. Of the longitudinal end portions of the tanks 25 and 26, the side opposite to the side where the inflow port 27 and the outflow port 28 are provided (on the right side in FIG. 1) is closed by bending a part of the tank main body 31. There is.

The tube 22, fins 23, insert 29, core plate 30, tank body 31, and cap 32 are made of metal (made of aluminum in this embodiment) and are integrally joined by brazing.

As shown in FIG. 4, an inlet-side pipe 33 through which hot water supplied to the heater core 13 flows is inserted into the inflow port 27. An outlet-side pipe (not shown) through which hot water flowing out of the heater core 13 has completed heat exchange at the core portion 24 is inserted into the outlet 28. The inlet side pipe 33 and the outlet side pipe are caulked and fixed by the cap portion 32.

As shown in FIGS. 2 to 4, a closing member 34 is arranged inside the inlet tank 25. The closing member 34 is a plate-shaped member, and is arranged in the longitudinal direction along the stacking direction of the tubes 22. The width direction of the closing member 34 is a direction along the longitudinal direction of the tube opening end portion 22a.

The closing member 34 is arranged so that the plate surface closes the tube opening end portion 22a. The closing member 34 is assembled by being inserted into the inlet tank 25 from the inflow port 27 in the tube stacking direction after the components of the heater core 13 are integrally joined by brazing.

The closing member 34 is arranged inside the inlet tank 25 on the side closer to the inflow port 27. Therefore, the closing member 34 closes the opening end portions 22a of a predetermined number of tubes 22 arranged on the side closer to the inflow port 27 among the plurality of tubes 22. In the present embodiment, the opening end portion 22a is closed by the closing member 34 in the tube 22 which is about half of the tubes 22 constituting the core portion 24. That is, the opening area of the tube opening end portion 22a is reduced by being closed by the closing member 34.

In the tube 22 on the side close to the inflow port 27 provided with the closing member 34, the inflow of hot water is restricted by the closing member 34. As a result, the hot water can flow to the inner side of the inlet tank 25 away from the inflow port 27, and the flow rate of the hot water flowing into each tube 22 can be made uniform.

Here, the closing member 34 will be described in detail with reference to FIGS. 4 to 9. In FIGS. 5 to 9, the left-right direction in the figure is the tube width direction. In FIGS. 6 and 8, the vertical direction in the figure is the tube stacking direction. In FIGS. 6 and 8, the lower part in the figure is the side closer to the inflow port 27, and the direction from the lower part to the upper part in the figure is the flow direction of the hot water flowing in from the inflow port 27.

For the closing member 34, it is desirable to use a material having characteristics such as high LLC resistance, flexibility and heat resistance, and a small amount of creep deformation. A resin material can be preferably used as the closing member 34. In this embodiment, the closing member 34 is formed of polyacetal (POM). The closing member 34 may be molded of polypropylene (PP), 66 nylon (PA66), polyphenylene sulfide (PPS), or the like.

The closing member 34 has a main body portion 35 and a movable portion 36. As shown in FIGS. 7 and 9, the main body 35 is formed by laminating a plurality of plate-shaped members. The movable portion 36 is arranged between the plurality of plate-shaped members constituting the main body portion 35. The movable portion 36 is a plate-shaped member separate from the main body portion 35. In this embodiment, two movable portions 36 are provided. In the closing member 34, the area is expanded at the portion where the movable portion 36 is provided, and the closing rate of the tube opening end portion 22a is increased. The blockage rate is the ratio of the area closed by the closing member 34 to the opening area of the tube opening end 22a.

As shown in FIG. 4, the main body portion 35 has a shorter width direction length D on the side farther from the inflow port 27 than a width direction length C on the side closer to the inflow port 27. That is, the main body 35 is formed in a tapered shape in which the length in the width direction decreases from the side near the inflow port 27 toward the side far from the inflow port 27. Therefore, the area of the main body 35 of the closing member 34 that closes the tube opening end 22a gradually decreases from the side near the inflow port to the side far from the inflow port 27.

The movable portion 36 is provided corresponding to a part of the tubes 22 on the side closer to the inflow port 27 among a predetermined number of tubes 22 that are blocked by the closing member 34. In the example shown in FIG. 4, the movable portion 36 is provided corresponding to the three tubes 22 on the side close to the inflow port 27.

The tube opening end 22a closed by the main body 35 and the movable portion 36 has a smaller opening area and a higher closing rate than the tube opening end 22a closed only by the main body 35.

The movable portion 36 is displaceable. The movable portion 36 can be moved between a state in which it protrudes from the main body portion 35 shown in FIGS. 6 and 7 and a state in which it is housed in the main body portion 35 shown in FIGS. 8 and 9. The movable portion 36 of the present embodiment slides and moves in a direction orthogonal to the longitudinal direction of the main body portion 35. It is desirable that the closing member 34 is provided with a guide portion that guides the movable portion 36 along a direction orthogonal to the longitudinal direction of the main body portion 35. The guide portion can be formed in the shape of a rail, for example.

When the movable portion 36 is displaced, the width direction length E (hereinafter, also referred to as “variable width direction length E”) of the portion of the closing member 34 where the movable portion 36 is provided changes. The closing member 34 has a first state in which the length E in the variable width direction is longer than the inner diameter B of the inflow port 27 due to the displacement of the movable portion 36, and a first state in which the length E in the variable width direction is shorter than the inner diameter B of the inflow port 27. It is possible to change to two states.

As shown in FIGS. 7 and 9, the closing member 34 is provided with an elastic member 37 for displacing the movable portion 36. The elastic member 37 is arranged so as to come into contact with the movable portion 36 inside the main body portion 35. The elastic member 37 exerts an elastic force in the direction of pushing the movable portion 36 from the main body portion 35. In this embodiment, a compression coil spring is used as the elastic member 37.

When no external force acts on the movable portion 36, the movable portion 36 is pushed out from the main body portion 35 by the elastic member 37, and is in the first state shown in FIGS. 6 and 7. At this time, as shown in FIG. 7, the length E in the displacement width direction is longer than the inner diameter B of the inflow port 27.

An external force acts on the movable portion 36 in a direction of moving it inside the main body 35, and when this external force is stronger than the elastic force of the elastic member 37, the movable portion 36 is stored inside the main body 35. Move to. When the movable portion 36 is completely housed in the main body portion 35, the second state shown in FIGS. 8 and 9 is obtained. At this time, as shown in FIG. 9, the length E in the displacement width direction is shorter than the inner diameter B of the inflow port 27.

Therefore, by applying an external force to the movable portion 36 to make the length E of the closing member 34 in the variable width direction shorter than the inner diameter B of the inflow port 27, the closing member 34 is placed in the inlet tank 25 via the inflow port 27. Can be assembled inside. For example, by manually compressing the movable portion 36, the length E in the variable width direction can be made shorter than the inner diameter B of the inflow port 27. Since no external force acts on the movable portion 36 of the closing member 34 inserted inside the inlet tank 27, the movable portion 36 expands due to the elastic force of the elastic member 37, and the length E in the variable width direction becomes longer.

The movable portion 36 is provided with a groove portion 36a. In this embodiment, a plurality of groove portions 36a are provided. The groove portion 36a is an elongated recess formed on the surface of the movable portion 36. The groove portion 36a extends in a direction away from the main body portion 35 from the lower side to the upper side in FIG. That is, the groove portion 36a extends in a direction away from the main body portion 35 as the distance from the inflow port 27 increases.

The movable portion 36 is provided with an inclined portion 36b. The inclined portion 36 is formed at the widthwise end portion of the movable portion 36. The inclined portion 36b is formed so that the thickness decreases toward the tip end.

When the groove portion 36a and the inclined portion 36b receive the flow of hot water flowing in from the inflow port 27, the movable portion 36 moves in the direction toward the inside of the main body portion 35. That is, the kinetic energy of the hot water becomes an external force for moving the movable portion 36 by the groove portion 36a and the inclined portion 36b.

Here, the displacement of the movable portion 36 due to the flow of hot water will be described. 10 and 11 show the closing member 34 and the tube 22 in a state where the closing member 34 is assembled inside the inlet tank 25 and when the flow rate of hot water is an extremely low flow rate (for example, 3 L / min). 12 and 13 show the closing member 34 and the tube 22 when the flow rate of hot water is a normal flow rate (for example, 6 L / min).

As shown in FIG. 11, a gap is formed between the movable portion 36 and the tube opening end portion 22a. This gap can prevent the movable portion 36 from coming into contact with the tube opening end portion 22a and becoming a resistance when the movable portion 36 is displaced. In order to enhance the effect of closing the tube opening end 22a with the movable portion 36, it is desirable that the gap between the movable portion 36 and the tube opening end 22a is as small as possible.

As shown in FIGS. 10 and 11, when the closing member 34 is assembled inside the inlet tank 25, the movable portion 36 protrudes maximum from the main body portion 35 by the elastic force of the elastic member 37. That is, the area where the movable portion 36 closes the tube opening end portion 22a is in the maximum state.

When the flow rate of hot water flowing into the inlet tank 25 is extremely low (for example, 3 L / min), the external force acting on the movable portion 36 by the hot water is smaller than the elastic force of the elastic member 37, so that the movable portion 36 is shown in FIG. It does not displace from the state shown in FIG. Therefore, when the hot water flow rate is extremely low, the inflow of hot water into the tube 22 is greatly restricted by the movable portion 36 in some tubes 22 located on the side close to the inflow port 27.

When the flow rate of the hot water flowing into the inlet tank 25 increases to a normal flow rate (for example, 6 L / min), the external force acting on the movable portion 36 by the hot water becomes larger than the elastic force of the elastic member 37, and the variable portion 36 acts on the main body portion 35. Displace in the stowed direction. As a result, as shown in FIGS. 12 and 13, the area of the movable portion 36 becomes smaller, the opening area of the opening end portion 22a of the tube 22 becomes larger than that in the states shown in FIGS. .. Therefore, when the hot water flow rate is a normal flow rate, the inflow of hot water into the tube 22 increases in some tubes 22 located near the inflow port 27 as compared with the case where the hot water flow rate is extremely low. ..

Here, the relationship between the flow rate of the hot water flowing into the inlet tank 25 and the flow rate of the hot water flowing through each tube 22 will be described with reference to FIGS. 14 and 15. In FIGS. 14 and 15, the vertical axis represents the hot water flow rate of the tube 22, and the horizontal axis represents the position of each tube 22 with respect to the inflow port 27. The left side in the figure shows the hot water flow rate of the tube 22 on the front side near the inflow port 27, and the right side in the figure shows the hot water flow rate of the tube 22 on the back side far from the inflow port 27.

In FIGS. 14 and 15, the hot water flow rate of each tube 22 when the closing member 34 of the present embodiment is used is shown by a solid line, and Comparative Example 1 without the closing member is shown by a broken line. Comparative Example 2 using the closing member consisting of only the portion 35 is shown by a two-dot chain line.

As shown in FIG. 14, when the hot water flow rate is extremely low (for example, 3 L / min), in Comparative Example 1 in which the closing member is not used, the hot water flow rate is high in several tubes 22 on the side close to the inflow port 27. It is extremely large, and the hot water flow rate of the tube 22 on the side far from the inflow port 27 is extremely small. In Comparative Example 2 using the closing member in which the movable portion 36 is not provided, although the bias of the hot water flow rate is slightly eliminated as compared with Comparative Example 1, the hot water flow rate is formed by several tubes 22 on the side closer to the inflow port 27. Is extremely large. On the other hand, when the closing member 34 of the present embodiment is used, the hot water flow rate of the tube 22 closer to the inflow port 27 than that of Comparative Examples 1 and 2 is significantly reduced, and the hot water flow rate of each tube 22 is increased. It is uniform.

As shown in FIG. 15, when the hot water flow rate is a normal flow rate (for example, 6 L / min), in Comparative Example 1 in which the closing member is not used, the hot water flow rate is large in several tubes 22 on the side close to the inflow port 27. , The hot water flow rate of the tube 22 on the side far from the inflow port 27 is reduced. In Comparative Example 2 using the closing member not provided with the movable portion 36, the hot water flow rate is reduced in several tubes 22 on the side close to the inflow port 27, and the hot water flow rate of each tube 22 is made uniform. When the closing member 34 of the present embodiment is used, the hot water flow rate of each tube 22 is more uniform than that of Comparative Example 2.

When the movable portion 36 of the closing member 34 is configured so as not to be displaced according to the hot water flow rate, the hot water flow rate of each tube 22 can be made uniform if the hot water flow rate is extremely low. On the other hand, in the configuration in which the movable portion 34 does not displace according to the hot water flow rate, when the hot water flow rate increases, the hot water flow rate becomes too small in the tube 22 on the side close to the inflow port 27, and the hot water flow rate of each tube 22 becomes uniform. It may not be possible.

On the other hand, in the closing member 34 of the present embodiment, since the movable portion 36 is displaced according to the hot water flow rate, the open end portion 22a of the tube 22 corresponding to the movable portion 36 as the hot water flow rate increases. The opening area of is large. As a result, even when the hot water flow rate increases, it is possible to prevent the hot water flow rate of the tube 22 on the side close to the inflow port 27 from becoming too small, and the hot water flow rate of each tube 22 can be made uniform.

According to the present embodiment described above, the closing member 34 that closes the tube opening end 22a inside the inlet tank 25 is provided with a movable portion 36 that expands the area, and the tube opening end 22a on the side close to the inflow port 27 is provided. Increasing the blockage rate of. As a result, when the hot water flow rate is extremely low, the tube 22 located near the inflow port 27 can greatly restrict the inflow of hot water into the tube 22 by the movable portion 36, and the hot water in each tube 22 can be significantly restricted. The flow rate can be made uniform. As a result, it is possible to suppress the generation of a temperature distribution in the air after the heat exchange in the heater core 13, and it is possible to suppress the deterioration of the air conditioning feeling.

Further, the movable portion 36 can be displaced by an external force, and the length E in the width direction of the portion of the closing member 34 where the movable portion 36 is provided can be made shorter than the inner diameter B of the inflow port 27. As a result, the closing member 34 can be inserted into the inlet tank 25 from the inflow port 27 and installed after the components of the heater core 13 are integrally joined by brazing.

Further, the closing member 34 includes an elastic member 37 that exerts an elastic force in the direction of pushing the movable portion 36 from the main body portion 35. As a result, after the closing member 34 is inserted into the inlet tank 25 and assembled, the movable portion 36 can be projected from the main body portion 35, and the closing rate of the tube opening end portion 22a corresponding to the movable portion 36 can be increased. Can be done.

Further, the movable portion 36 is provided with a groove portion 36a and an inclined portion 36b that receive the flow of hot water, and can be displaced by the flow of hot water. As a result, even when the flow rate of the hot water flowing into the inlet tank 25 increases from the extremely low flow rate, it is possible to prevent the hot water flow rate of the tube 22 near the inflow port 27 from becoming too small, and it is possible to prevent the hot water flow rate of each tube 22 from becoming too small. The hot water flow rate can be made uniform.

Further, in the closing member 34 of the present embodiment, the main body portion 35 is formed in a tapered shape in which the length in the width direction decreases from the side near the inflow port 27 to the side far from the inflow port 27. As a result, in the tube 22 closed by the main body 35, the closing rate of the tube opening end 22a decreases as the distance from the inflow port 27 increases. As a result, the effect of suppressing the flow rate of hot water by the main body 35 decreases from the side closer to the inflow port 27 having a small pressure loss toward the side farther from the inflow port 27 having a large pressure loss. Therefore, the flow rate of hot water can be made more uniform with respect to the tube 22 closed by the main body 35.

(Second Embodiment)
Next, the second embodiment of the present invention will be described. In the second embodiment, the configuration of the closing member 34 is different from that in the first embodiment. Hereinafter, parts different from the first embodiment will be described.

As shown in FIG. 16, in the closing member 34 of the second embodiment, the main body portion 35 and the movable portion 36 are connected by a bent portion 38. The movable portion 36 can be bent with respect to the main body portion 35 by the bent portion 38. Specifically, the movable portion 36 has a first state in which it is flush with the main body portion 35 (that is, the state shown in FIG. 17) and a second state in which the movable portion 36 is bent at a right angle to the main body portion 35 (that is, FIG. 18). It can be displaced to the state shown in). In the first state, the variable width direction length E of the closing member 34 is shorter than the inner diameter B of the inflow port 27, and in the second state, the variable width direction length E of the closing member 34 is longer than the inner diameter B of the inflow port 27. Become.

The bent portion 38 is an elastic member that exerts an elastic force on the movable portion 36. The bent portion 38 of the second embodiment uses a spring hinge using a torsion coil spring. The bent portion 38 exerts an elastic force in the direction in which the movable portion 36 is brought into the first state. Therefore, when no external force is applied to the movable portion 36, the first state shown in FIG. 17 is obtained.

The movable portion 36 of the second embodiment is formed with an opening 36c opened on the plate surface. The movable portion 36 is provided with an opening / closing member 39 that opens / closes the opening 36c.

The opening / closing member 39 is a rotation shaft provided at a portion connecting the lid portion 39a capable of covering the opening portion 36c, the protrusion portion 39b forming a predetermined angle with respect to the lid portion 39a, and the lid portion 39a and the protrusion portion 39b. It has 39c.

The opening / closing member 39 is rotatably held by the movable portion 36 about the rotation shaft 39c. By rotating the opening / closing member 39, the lid 39a is displaced to the state where the lid 39a is in contact with the opening 36c to close the opening 36c, and the lid 39a is displaced from the opening 36c to the state where the opening 36c is opened. Can be done.

The rotating shaft 39c is provided with an elastic member that causes the opening / closing member 39 to exert an elastic force in the direction in which the lid portion 39a closes the opening 36c. As such an elastic member, for example, a torsion coil spring can be used. When no external force acts on the opening / closing member 39, the lid 39a closes the opening 36c.

The protrusion 39b can receive the flow of hot water flowing into the inlet tank 25. When the protrusion 39b receives the flow of hot water, the opening / closing member 39 rotates in the direction in which the lid 39a separates from the opening 36c. That is, the kinetic energy of the hot water becomes an external force for rotating the opening / closing member 39 by the protrusion 39b.

The closing member 34 of the second embodiment inserts the closing member 34 into the inlet tank 25 via the inflow port 27 by, for example, bending the movable portion 36 by hand to bring it into the second state shown in FIG. be able to. The closing member 34 inserted into the inlet tank 27 has the movable portion 36 flush with the main body portion 35 due to the elastic force of the bent portion 38, and is in the first state shown in FIG.

As shown in FIG. 19, when the closing member 34 is assembled to the inlet tank 25, the opening 36c is closed by the opening / closing member 39, and the area where the movable portion 36 closes the tube opening end 22a is the maximum. It is in a state. When the flow rate of hot water flowing into the inlet tank 25 is extremely low (for example, 3 L / min), the external force acting on the protrusion 39b by the hot water is smaller than the elastic force acting on the opening / closing member 39. It does not displace from the state shown in 19. Therefore, when the hot water flow rate is extremely low, the inflow of hot water into the tube 22 is greatly restricted by the movable portion 36 in some tubes 22 located on the side close to the inflow port 27.

When the flow rate of the hot water flowing into the inlet tank 25 increases to a normal flow rate (for example, 6 L / min), the external force acting on the protrusion 39b by the hot water becomes larger than the elastic force acting on the opening / closing member 39, and the lid 39a opens. The opening / closing member 39 rotates in the direction away from 36c. As a result, as shown in FIG. 20, the opening 36c is opened, the opening area of the opening end 22a of the tube 22 is increased, and the blockage rate is lowered. Therefore, when the hot water flow rate is a normal flow rate, the inflow of hot water into the tube 22 increases in some tubes 22 located near the inflow port 27 as compared with the case where the hot water flow rate is extremely low. ..

In the second embodiment described above, by making the movable portion 36 of the closing member 34 foldable with respect to the main body portion 35, each component of the heater core 13 is integrally joined by brazing, and then the inflow port. It can be inserted into the inlet tank 25 from 27.

Further, the closing member 34 includes a bending portion 38 that exerts an elastic force on the movable portion 36. As a result, after the closing member 34 is inserted into the inlet tank 25 and assembled, the movable portion 36 can be made flush with the main body portion 35, and the closing rate of the tube opening end portion 22a corresponding to the movable portion 36 is increased. Can be made to.

Further, the movable portion 36 includes an opening / closing member 39 that opens / closes the opening 36c in response to the flow of hot water. As a result, even when the flow rate of the hot water flowing into the inlet tank 25 increases from the extremely low flow rate, it is possible to prevent the hot water flow rate of the tube 22 near the inflow port 27 from becoming too small, and it is possible to prevent the hot water flow rate of each tube 22 from becoming too small. The hot water flow rate can be made uniform.

(Third Embodiment)
Next, a third embodiment of the present invention will be described. In the third embodiment, the opening / closing member provided in the movable portion 36 of the closing member 34 is different from that in the second embodiment. Hereinafter, parts different from each of the above embodiments will be described.

As shown in FIGS. 21 and 22, in the third embodiment, an opening / closing member 40 made of a temperature-sensitive member that is displaced based on a temperature change is used in the opening 36c of the movable portion 36. As the temperature-sensitive member constituting the opening / closing member 40, for example, a bimetal, a shape memory alloy, or the like can be used. The opening / closing member 40 of the third embodiment is flat at a temperature lower than a predetermined temperature, and is curved at a temperature higher than the predetermined temperature.

As shown in FIG. 21, when the temperature of the hot water flowing into the inlet tank 25 is lower than the predetermined temperature, the opening 36c of the movable portion 36 is closed by the flat plate-shaped opening / closing member 40, and the tube opening end 22a The blockage rate is high. Therefore, when the hot water temperature is lower than the predetermined temperature, the inflow of hot water into the tube 22 is greatly restricted by the movable portion 36 in some tubes 22 located on the side closer to the inflow port 27.

Then, as shown in FIG. 22, when the temperature of the hot water flowing into the inlet tank 25 becomes higher than the predetermined temperature, the opening / closing member 40 is curved, the opening 36c of the movable portion 36 is opened, and the tube opening end 22a is closed. The rate is low. Therefore, as the hot water temperature becomes higher than the predetermined temperature, the inflow of hot water into the tube 22 increases in some tubes 22 located closer to the inflow port 27.

In the third embodiment described above, the movable portion 36 of the closing member 34 is provided with an opening / closing member 40 that opens / closes the opening 36c in response to a temperature change of hot water. As a result, the closing rate of the tube opening end 22a by the closing member 34 can be changed according to the temperature of the hot water flowing into the inlet tank 25. As a result, in some tubes 22 located on the side closer to the inflow port 27 corresponding to the movable portion 36, the inflow amount of hot water can be reduced as the hot water temperature is lower, and the hot water temperature is higher as the predetermined temperature is higher. The inflow of water can be increased.

Temperature When the temperature is lower than the predetermined temperature, it is assumed that the hot water flow rate is extremely low in order to warm up the engine at an early stage. Therefore, when the hot water temperature is low, the hot water flow rate of each tube 22 can be made uniform by reducing the inflow amount of the hot water in some of the tubes 22 located on the side close to the inflow port 27.

When the hot water temperature is high, it is assumed that the engine warm-up is completed and the hot water flow rate becomes the normal flow rate. Therefore, when the hot water temperature is high, the hot water flow rate of each tube 22 can be made uniform by increasing the inflow amount of the hot water in some of the tubes 22 located on the side close to the inflow port 27.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows without departing from the spirit of the present invention. Moreover, the means disclosed in each of the above-described embodiments may be appropriately combined to the extent feasible.

(1) In each of the above embodiments, the present invention is applied to the heater core of the vehicle air conditioner, but the present invention is not limited to this, and the radiator for cooling the vehicle engine, the refrigerant condenser of the vehicle air conditioner, etc. It can be applied to heat exchangers, and further, the present invention can be widely applied to various heat exchangers other than those for vehicles.

(2) In each of the above embodiments, the closing member 34 is arranged in the inlet tank 25, but the closing member 34 may be arranged in the outlet tank 26, and the closing member 34 is placed in the inlet tank 25 and in the inlet tank 25. It may be arranged in both of the outlet tanks 26.

(3) In the second embodiment, an elastic member made of a spring hinge is used as the bent portion 38, but the present invention is not limited to this, and the bent portion 38 may have a different configuration. For example, the main body portion 35 and the movable portion 36 can be used as one resin member, and the portion where one resin member bends due to elastic deformation can be used as the bent portion 38. According to such a configuration, the closing member 34 can pass through the inflow port 27 by bending the movable portion 36 with respect to the main body portion 35 by hand or the like. Further, after the closing member 34 is installed in the tank 25, the elastically deformed resin returns to the original state, so that the movable portion 36 becomes the same plane as the main body portion 35.

(4) In the second embodiment, the opening / closing member 39 uses the elastic force of the spring to open / close the opening 36c of the movable portion 36, but the present invention is not limited to this, and for example, elastic deformation of the resin is used. The opening 36c of the movable portion 36 may be opened and closed.

13 Heater core (heat exchanger)
22 Tube 22a Open end 25 Inlet tank (tank)
26 Outlet tank (tank)
27 Inflow port (fluid passage port)
28 Outlet (fluid passage)
34 Closing member 35 Main body 36 Moving part 37 Elastic member 38 Bending part (elastic member)
40 Opening and closing member (temperature sensitive member)

Claims (7)

A core portion (23) having a flat cross section and a plurality of tubes (22) through which a fluid flows inside are laminated.
A pair of tanks (25, 26) connected to the open ends (22a) at both ends of the plurality of tubes.
A closing member (34) arranged inside at least one of the pair of tanks is provided.
The pair of tanks are provided with fluid passage ports (27, 28) for inflowing or outflowing the fluid at ends on the same side in the stacking direction of the tubes, respectively.
The length of the opening end portion of the tube in the longitudinal direction is longer than the inner diameter of the fluid passage port.
The closing member closes at least a part of the opening end portion in a predetermined number of the tubes arranged on the side close to the fluid passage port.
The closing member has a first state in which the width direction of the closing member along the longitudinal direction of the opening end is longer than the inner diameter of the fluid passage port and a second state in which the length in the width direction is shorter than the inner diameter of the fluid passage port. A heat exchanger having a moving part (36) to be changed. The heat exchanger according to claim 1, further comprising an elastic member (37, 38) that exerts an elastic force on the movable portion in a direction of changing from the second state to the first state. The movable portion can change the blockage rate of the open end portion according to the flow rate of the fluid, and the smaller the flow rate of the fluid, the higher the blockage rate of the open end portion, and the flow rate of the fluid increases. The heat exchanger according to claim 1 or 2, wherein the larger the number, the lower the blockage rate of the open end portion. The movable portion can change the occlusion rate of the opening end portion according to the temperature of the fluid, and the higher the temperature of the fluid, the lower the occlusion rate of the opening end portion, and the temperature of the fluid becomes higher. The heat exchanger according to claim 1, wherein the lower the value, the higher the blockage rate of the open end portion. The heat exchanger according to claim 4, wherein the movable portion includes a temperature sensitive member (40) that can be deformed according to the temperature of the fluid. The heat exchanger according to any one of claims 1 to 5, wherein a gap is provided between the movable portion and the open end portion of the tube. The heat exchanger according to any one of claims 1 to 6, wherein the closing member has a shorter length in the width direction on a side farther from the fluid passage port than on a side closer to the fluid passage port. ..

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