JP4289238B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that has a rotary heating heat exchanger as an air heating means and adjusts the blown air temperature by adjusting the rotational position of the rotary heating heat exchanger. Is suitable.

  Conventionally, as a temperature adjustment method for a vehicle air conditioner, an air mix type in which the air volume ratio between cold air and hot air is adjusted by an air mix door to adjust the temperature of air blown into the vehicle interior is typical.

  In this air mix type vehicle air conditioner, the hot water heating heat exchanger itself is configured to be rotatable so that the hot water heating heat exchanger also serves as an air mix door. The door can be abolished, and at the time of maximum cooling, the hot water heating heat exchanger can be rotated to a position that does not provide resistance to the flow of cold air, that is, to the side of the cold air flow passage so that the amount of cold air can be increased. Has been proposed (see, for example, Patent Document 1 and Patent Document 2).

  By the way, even if the hot water heating heat exchanger is rotated to the side position of the cold air flow passage during maximum cooling, if the hot water still flows through the hot water heating heat exchanger, the hot water heating heat exchanger Since the cold air temperature rises due to heat dissipation from the air, the maximum cooling performance is reduced.

Therefore, in Patent Document 1 and Patent Document 2, a rotating-side hot water flow path unit integrated with a hot water heating heat exchanger and a fixed-side hot water flow path in which the rotating-side hot water flow path unit is rotatably fitted. A hot water flow blocking mechanism configured to block the hot water flow channel when the hot water heating heat exchanger is rotated to the maximum cooling position is provided in the hot water flow channel mechanism including the unit.
JP 2001-47845 A Japanese Patent Laid-Open No. 2001-246922

  However, in the prior art, the hot water flow to the heat exchanger for heating is stopped during the maximum cooling, so that the hot water pressure increases. For this reason, it is necessary to increase the pressure resistance of the hot water flow path mechanism, which increases the product cost.

  In view of the above points, the present invention is based on the heat radiation of a rotary heating heat exchanger in an air conditioner that adjusts the blown air temperature using a rotary heating heat exchanger without interrupting the hot water flow during maximum cooling. The purpose is to prevent an increase in cold air temperature.

The present invention has been devised to achieve the above object. In the invention according to claim 1, the heat exchanger (15) for heating is changed by changing the rotational position of the heat exchanger (15) for heating. In the air conditioner for adjusting the blown air temperature by adjusting the air volume ratio between the hot air passing through the air and the cold air bypassing the heating heat exchanger (15),
An inlet flow channel for allowing the heat source fluid to flow into the heating heat exchanger (15) and an outlet flow channel for allowing the heat source fluid to flow from the heating heat exchanger (15) are configured by the coaxial double pipe structure (16),
The heating heat exchanger (15) is configured to be rotatable about the central axis (A) of the coaxial double pipe structure (16), and
When the heating heat exchanger (15) is rotated to the maximum cooling position, the bypass passage mechanism (30) directly connects the inlet portion (25) and the outlet portion (22) of the coaxial double pipe structure (16). Is configured in a coaxial double pipe structure (16),
When the heating heat exchanger (15) is rotated from the maximum cooling position to the maximum heating position, the bypass passage mechanism (30) changes in the passage blocking direction.

  According to this, since the inlet portion (25) and the outlet portion (22) of the coaxial double pipe structure (16) are directly communicated by the bypass passage mechanism (30) at the time of maximum cooling, the heating heat exchanger (15) side The passage of the bypass passage mechanism (30) can be formed in parallel with the heat source fluid passage. In addition, since the passage of the bypass passage mechanism (30) is significantly shorter than the heat source fluid passage on the heating heat exchanger (15) side, the flow resistance can be designed to be very small.

  For this reason, the heat source fluid flows substantially only through the bypass passage mechanism (30) side, and does not flow through the heating heat exchanger (15) side passage. Thereby, even if the air flow in the air conditioning case (11) contacts the heat exchanger for heating (15) at the time of maximum cooling, the temperature of the air flow does not increase, and the maximum cooling performance can be effectively exhibited.

  In addition, the bypass passage mechanism (30) merely forms a bypass flow of the heat source fluid to the heat exchanger (15) for heating, and does not block the flow of the heat source fluid, so the pressure of the heat source fluid such as hot water increases. Never do. Accordingly, there is no need to increase the pressure resistance of the coaxial double pipe structure (16), and the product cost can be reduced accordingly.

  In addition, when the heating heat exchanger (15) is rotated from the maximum cooling position to the maximum heating position, the bypass passage mechanism (30) changes in the passage blocking direction, so that the heating heat exchanger (15) In the maximum heating position, the bypass passage mechanism (30) is shut off and the entire amount of the heat source fluid flowing into the inlet portion (25) of the coaxial double pipe structure (16) is caused to flow to the heating heat exchanger (15). Can do. Therefore, even if the bypass passage mechanism (30) is provided, there is no hindrance to the maximum heating performance.

As in the invention according to claim 2, in the air conditioner according to claim 1, the coaxial double pipe structure (16) has a rotating side pipe (26) that rotates integrally with the heating heat exchanger (15). A fixed side pipe (22) in which the rotary side pipe (26) is rotatably fitted, a rotary side opening (31) provided in the rotary side pipe (26), and a fixed side pipe (22). A fixed-side opening (32) formed,
What is necessary is just to comprise a bypass channel | path mechanism (30) by the rotation side opening part (31) and the fixed side opening part (32).

As in the invention according to claim 3, in the air conditioner according to claim 2, more specifically, the fixed side pipe is the inner side fixed pipe (22),
The rotation side pipe is an inner rotation pipe (26) that is rotatably fitted to the inner fixed pipe (22),
The outlet portion is constituted by an inner fixed pipe (22),
The outer fixed pipe (23) is arranged at a predetermined interval on the outer peripheral side of the inner rotary pipe (26),
The inlet portion (25) is formed in the outer fixed pipe (23).

  According to a fourth aspect of the present invention, in the air conditioner according to any one of the first to third aspects, the heating heat exchanger (15) is rotated from the maximum cooling position to the maximum heating position by a predetermined angle. In the meantime, the air conditioning case (11) is provided with a heat exchanger housing (11a) for preventing air from flowing into the heating heat exchanger (15).

  According to this, at the time of maximum cooling, the heating heat exchanger (15) is housed in the heat exchanger housing portion (11a), and it is possible to prevent the ventilation resistance from being generated by the heating heat exchanger (15). The maximum cooling performance can be improved by increasing the amount of cool air blown at the time of maximum cooling.

  Moreover, by storing the heating heat exchanger (15) in the heat exchanger storage section (11a) during maximum cooling, the heating heat exchanger (15) is predetermined from the maximum cooling position to the maximum heating position. It is possible to prevent air from flowing into the heating heat exchanger (15) until the angle is rotated.

  As a result, at the time when the heating heat exchanger (15) escapes from the heat exchanger housing (11a) and air inflow into the heating heat exchanger (15) is started, the bypass passage mechanism (30 ) Can be shifted to a small opening state or a shut-off state.

  For this reason, when the inflow of air into the heat exchanger (15) for heating is started, the flow rate of the heat source fluid (warm water) passing through the bypass passage mechanism (30) is limited to a small amount or zero, and heat exchange for heating is performed. A sufficient amount of heat source fluid can be passed through the passage on the side of the vessel (15). Accordingly, the presence of the bypass passage mechanism (30) can suppress the heat source fluid flow rate on the heating heat exchanger (15) side from decreasing and the adjustment of the blown air temperature from becoming unfavorable.

In invention of Claim 5, the air conditioner as described in any one of Claim 1 thru | or 4 is comprised for vehicles,
In the heating heat exchanger (15), the hot water heated by the on-vehicle heat source device is circulated as the heat source fluid,
The air whose temperature is adjusted by the rotational position of the heat exchanger for heating (15) is blown out into the passenger compartment.

  According to this, the above-mentioned effect can be exhibited in the vehicle air conditioner.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a schematic sectional view of an indoor air conditioning unit of a vehicle air conditioner equipped with a rotary heating heat exchanger according to the present invention, showing a maximum cooling state, and FIG. 2A is a temperature control of the indoor air conditioning unit. FIG. 3A is a schematic sectional view showing the maximum heating state of the indoor air conditioning unit.

  FIG. 4 is a cross-sectional view of the principal part showing the maximum cooling state of the rotary heating heat exchanger and the hot water inlet / outlet coaxial double pipe portion, and FIG. 5 is the rotary heating heat exchanger and the hot water inlet / outlet coaxial double pipe portion. It is principal part sectional drawing which shows the temperature control state or maximum heating state of this. 1 (b), 2 (b), and 3 (b) are cross-sectional views of the main part showing the maximum cooling state, the temperature control state, and the maximum heating state of the coaxial water double pipe for hot water in / out.

  First, the outline of the indoor air conditioning unit 10 of the vehicle air conditioner will be described with reference to FIGS. 1 (a), 2 (a), and 3 (a). Inside the panel (instrument panel), it is arranged at a substantially central portion in the vehicle left-right direction. In addition, each arrow before and after up and down in FIGS. 1A to 3A indicates a direction in a vehicle-mounted state. The direction perpendicular to the plane of FIG. 1A to FIG. 3A is the vehicle left-right (width) direction.

  The indoor air-conditioning unit 10 includes a resin air-conditioning case 11 that forms a passage for air flowing toward the passenger compartment. The air-conditioning case 11 is actually formed as a plurality of divided case bodies for convenience in resin molding, assembly of built-in parts, and the like, and the plurality of divided case bodies are integrated by fastening means such as screws and clips. The air-conditioning case 11 is configured by fastening to.

  And in this embodiment, the air inlet 12 is provided in the lower part of the vehicle front side among the air-conditioning cases 11, and air flows into this air inlet 12 from the air blower part which is not shown in figure as the arrow a. As is well known, the blower unit rotates a centrifugal blower fan by a motor (not shown). An inside / outside air switching box (not shown) is connected to the suction port of the blower fan, and the inside or outside air is sucked from the inside / outside air switching box.

  An evaporator 13 that forms a heat exchanger for cooling is disposed at a lower portion inside the air conditioning case 11. Here, the evaporator 13 has a rectangular thin shape, and the entire amount of blown air from the blower section passes from the lower side to the upper side as shown by the arrows in the drawing. The evaporator 13 is a low pressure side heat exchanger of a vapor compression refrigeration cycle as is well known, and cools the blown air by absorbing the low pressure refrigerant from the blown air and evaporating it.

  And in the air-conditioning case 11, the heater core 15 is arrange | positioned in the upper part of the evaporator 13, ie, the air flow downstream. The heater core 15 is a heating heat exchanger that heats air with warm water (engine cooling water) from a vehicle engine (not shown).

  The heater core 15 has a coaxial double pipe portion 16 for entering and exiting hot water, which will be described later, and is configured to be rotatable around the coaxial double pipe portion 16.

  More specifically, the coaxial double pipe portion 16 is coupled to the upper end portion of the heater core 15 in the present embodiment, and the coaxial double pipe portion 16 is connected to the vehicle left-right direction (see FIGS. 1A to 3A). The coaxial double pipe portion 16 is disposed in close contact with the upper side wall surface of the air conditioning case 11 on the vehicle front side. Thereby, the heater core 15 is rotatable in the vehicle front-rear direction around the coaxial double pipe portion 16.

  Further, in the air conditioning case 11, a housing portion 11a that houses the heater core 15 when the heater core 15 is rotated to the maximum cooling position shown in FIG. The storage portion 11a has a concave shape having a depth equivalent to the thickness of the heater core 15 (dimension in the air passage direction).

  Accordingly, when the heater core 15 is rotated to the maximum cooling position shown in FIG. 1A and the entire heater core 15 is stored in the storage portion 11a, the heater core 15 is moved from the maximum cooling position shown in FIG. The air flow into the heater core 15 is prevented within a predetermined angular range until the lower end portion (rotating tip portion) of the heater core 15 is rotated counterclockwise and escapes from the storage portion 11a.

  For this reason, the accommodating part 11a comprises the run-up path 17 from the maximum cooling position (air inflow blocking position) of the heater core 15 to the air inflow start position to the heater core 15. The runway 17 is specifically about 20 mm in size.

  At the time of maximum cooling, the heater core 15 is housed in the housing portion 11a on the vehicle front side wall surface of the air conditioning case 11 as shown in FIG. 1A, and is arranged so as to extend substantially vertically along the vehicle front side wall surface. . As a result, in the air conditioning case 11, the entire passage on the upper side portion (downstream side of the air flow) of the evaporator 13 acts as the bypass passage 18 of the heater core 15. Thereby, at the time of the maximum cooling, the entire amount of the air passing through the evaporator (cold air) flows by bypassing the heater core 15 as indicated by the arrow b in FIG. 1A, so that the maximum cooling performance can be exhibited.

  On the other hand, the solid line position of the heater core 15 shown in FIG. 2 (a) is an example of an intermediate opening position at the time of temperature control. Since the flow on the front side passes through the heater core 15 and is heated as indicated by arrows c and d, it becomes warm air. On the other hand, in the evaporator passing air (cold air), the flow on the rear side of the vehicle flows through the bypass passage 18 of the heater core 15 as cold air as indicated by the arrow e.

  Therefore, by adjusting the rotation position of the heater core 15, the air volume ratio between the cold air that bypasses the heater core 15 and the hot air that passes through the heater core 15 can be adjusted to continuously adjust the temperature of the air blown into the vehicle interior.

  Note that the cold air that bypasses the heater core 15 and the warm air that passes through the heater core 15 are mixed in the upper region of the heater core 15 to be conditioned air at a desired temperature and flow into the outlet openings 19, 20, and 21, respectively. .

  Further, the solid line position of the heater core 15 shown in FIG. 3A is the maximum heating position, and the heater core 15 is further rotated counterclockwise from the solid line position of FIG. Are in contact with the vehicle rear side wall surface of the air conditioning case 11. In this operation position, the bypass passage 18 is fully closed by the heater core 15, and the entire amount of air passing through the evaporator (cold air) is heated through the heater core 15 as indicated by the arrow f, so that the maximum heating performance can be exhibited.

  In the present embodiment, the blowout openings 19, 20, and 21 for blowing air to each part of the vehicle compartment are arranged side by side in the vehicle front-rear direction on the upper surface of the air conditioning case 11. The defroster opening 19 is disposed at the front portion of the vehicle on the upper surface of the air conditioning case 11 and is connected to a defroster outlet on the upper surface of the vehicle instrument panel via a defroster duct (not shown). Blows air toward the inside.

  The face opening 20 is disposed at the rear side portion of the vehicle on the upper surface of the air conditioning case 11 and is connected to a face outlet disposed at an upper portion of the vehicle instrument panel via a face duct (not shown). Air is blown out from the exit to the occupant's face.

  The foot opening 21 is disposed between the defroster opening 19 and the face opening 20 on the upper surface of the air conditioning case 11 and blows air out to the occupant's feet via a foot duct (not shown). The defroster opening 19, the face opening 20, and the foot opening 21 are each opened and closed by a blowing mode door (not shown).

  Next, a specific configuration of the heater core 15 will be described with reference to FIGS. 4 and 5. A hot water inlet tank 15 a is disposed on one end side of the heater core 15, and a hot water outlet tank 15 b is disposed on the other end side of the heater core 15. In FIG. 1A to FIG. 3A, the hot water inlet tank 15 a is located at the lower end portion of the heater core 15, and the hot water outlet tank 15 is located at the upper end portion of the heater core 15. Accordingly, the coaxial double pipe portion 16 is disposed on the hot water outlet tank 15b side.

  And between these both tanks 15a and 15b, the heat exchange core part 15e of the all-path type (one-way flow type) is comprised by the laminated structure of the some flat tube 15c and the corrugated heat transfer fin 15d.

  Here, the plurality of flat tubes 15c are arranged in parallel in a line in the left-right direction of the vehicle, and one end portion (lower end portion) of all the flat tubes 15c communicates with the hot water inlet tank 15a and the other end portion (upper end portion). Communicates with the hot water outlet tank 15b. For this reason, the warm water flows in one direction from the warm water inlet tank 15a through all the flat tubes 15c in parallel to the warm water outlet tank 15b.

  Both tanks 15a and 15b are elongated in the direction in which the flat tubes 15c are arranged (the vehicle left-right direction). The blown air in the air conditioning case 10 is heated by passing through the gaps between the flat tubes 15c and the corrugated heat transfer fins 15d.

  Here, hot water flows into the hot water inlet tank 15a from the communication pipe 15f. 4 and 5, the heater core 15 portion constituted by the hot water inlet tank 15 a, the hot water outlet tank 15 b, the flat tube 15 c, the corrugated heat transfer fin 15 d, and the connecting pipe 15 f is illustrated by a two-dot chain line.

  In the present embodiment, the coaxial double pipe section 16 for entering and exiting hot water is disposed on the side of the hot water outlet tank 15b located on the upper end side of the heater core 15 (extending direction in the tank longitudinal direction). The coaxial double pipe portion 16 is roughly divided into a fixed portion 16a and a rotating portion 16b.

  Here, the fixing | fixed part 16a is a fixing member fixed to the air-conditioning case 11 side by attachment means, such as screwing which is not shown in figure. On the other hand, the rotating portion 16 b is a rotating member that is joined to the heater core 15 and rotates together with the heater core 15.

  The fixed portion 16a includes an inner pipe 22 that forms a minimum diameter portion, an outer pipe 23 that has a larger diameter than the inner pipe 22, and a maximum diameter portion that has a larger diameter than the outer pipe 23. And an annular portion 24 formed.

  The inner pipe 22, the outer pipe 23, and the annular part 24 of the fixed part 16 a are formed concentrically around the rotation center axis A of the heater core 15, and the inner pipe 22 → the outer pipe 23 → the annular part 24. The diameter dimension increases in the order of.

  An inlet pipe 25 that allows warm water to flow inside the outer pipe 23 is coupled in a direction orthogonal to the outer pipe 23. The fixed portion 16a of the present embodiment is integrally formed of a resin material with the entire shape including the inlet pipe 25.

  Hot water flows into the inlet pipe 25 from the discharge side of the hot water circuit of the vehicle engine through the hose 25a.

  On the other hand, the rotating portion 16b includes an inner pipe 26, an outer pipe 27 positioned at a predetermined interval on the outer peripheral side of the inner pipe 26, and a connecting pipe 28 coupled in a direction orthogonal to the outer pipe 27. have.

  The inner pipe 26 of the rotating portion 16b is rotatably fitted to the outer peripheral side of the inner pipe 22 of the fixed portion 16a and is watertightly fitted so as not to leak water, and communicates with the inner pipe 22 of the fixed portion 16a in a straight line. . Of this inner pipe 26, the end opposite to the fixed inner pipe 22 (the left end in FIGS. 4 and 5) communicates with one end in the longitudinal direction of the hot water outlet tank 15 b.

  An arrow W in FIG. 5 indicates a hot water flow channel, and the inlet pipe 25 of the fixed portion 16a passes through the inner space of the outer pipe 23 on the fixed side, and the outer peripheral side of the inner pipe 26 and the outer pipe 27 of the rotating portion 16b. It communicates with the space 29 between the inner peripheral side. Further, the space 29 communicates with the inlet portion of the communication pipe 15f on the heater core 15 side through the communication pipe 28, and the outlet portion of the communication pipe 15f communicates with one end in the longitudinal direction of the hot water inlet tank 15a.

  As a result, the hot water flowing into the inlet pipe 25 of the fixed portion 16a flows into the hot water inlet tank 15a through the outer pipe 23 → the space 29 → the communication pipe 28 → the communication pipe 15f of the fixed portion 16a. This hot water is distributed to the plurality of flat tubes 15c in the hot water inlet tank 15a, and flows through the plurality of flat tubes 15c from below to above.

  The warm water from the plurality of flat tubes 15c flows into the warm water outlet tank 15b and collects, passes through the inner pipe 26 of the rotating part 16b, and flows out to the inner pipe 22 of the fixed part 16a. The warm water in the inner pipe 22 passes through the return hose 22a and returns to the warm water circuit of the vehicle engine.

  By the way, in the fitting part between the inner pipe 26 of the rotating part 16b and the inner pipe 22 of the fixed part 16a, an inlet pipe 25 that is an inlet part of the coaxial double pipe structure 16 and an inner pipe on the fixed side that is an outlet part. A bypass passage mechanism 30 that directly communicates with 22 is provided.

  The bypass passage mechanism 30 includes a rotation-side opening 31 that opens to the rotation-side inner pipe 26 and a fixed-side opening 32 that opens to the fixed-side inner pipe 22. Both the openings 31 and 32 are arranged at the same position in the axial direction of the coaxial double pipe section 16, and the circumferential position of the rotation side opening 31 is set as follows.

  That is, only when the heater core 15 is rotated to the maximum cooling position, as shown in FIG. 1B, the rotation side opening 31 is superposed on the fixed side opening 32 in a fully opened state, and the bypass passage mechanism 30 is Fully open communication.

  On the other hand, when the heater core 15 is rotated to a temperature control state (intermediate rotation position) of a predetermined rotation angle or more, and when the heater core 15 is rotated to the maximum heating position, FIGS. As shown in (b), the circumferential direction position of the rotation side opening 31 is set so that the rotation side opening 31 moves to a position away from the fixed side opening 32 and the bypass passage mechanism 30 is in a blocked state. It is set.

  On the other hand, the outer peripheral surface of the outer pipe 27 of the rotating portion 16b is rotatably fitted to the inner peripheral surface of the annular portion 24 that forms the maximum diameter portion of the fixed portion 16a. An external leakage seal mechanism 33 using an O-ring is provided at a fitting portion between the outer peripheral surface of the outer pipe 27 on the rotation side and the inner peripheral surface of the annular portion 24 on the fixed side.

  In this external leak seal mechanism 33, the hot water that has flowed into the outer pipe 23 of the fixed portion 16a has a fitting gap between the inner peripheral surface of the annular portion 24 of the fixed portion 16a and the outer peripheral surface of the outer pipe 27 of the rotating portion 16b. And leaking directly to the outside of the coaxial double pipe section 16.

  In this embodiment, each member 15a, 15b, 15c, 15d, 15f of the heater core 15 is formed of a metal such as aluminum and assembled by integral brazing. Therefore, the rotating portion 16b is also formed of a metal such as aluminum, and the rotating portion 16b is integrally brazed to the heater core 15 when the heater core 15 is brazed. Thereby, the rotation part 16b can be integrated with the heater core 15 efficiently.

  In addition, since the rotation part 16b is shape | molded with the metal as mentioned above, it is preferable to actually divide | segment and shape the rotation part 16b into a some member, and join the some member integrally by brazing. .

  Next, the assembly structure of the heater core 15 to the air conditioning case 11 and the rotation drive mechanism of the heater core 15 will be described. The wall surface of the air conditioning case 11 shown in FIGS. 4 and 5 is a wall surface on one side in the vehicle left-right direction, and the wall surface of the air conditioning case 11 has a circular shape having an inner diameter that is a predetermined amount larger than the outer diameter of the annular portion 24 of the fixed portion 16a. The through hole 34 is opened.

  Since the rotary part 16b of the coaxial double pipe part 16 is integrated with the heater core 15 in advance, the heater core 15 is assembled into the air conditioning case 11 together with the rotary part 16b. Specifically, a shaft portion is provided at the other end portion in the longitudinal direction of the hot water outlet tank 15b of the heater core 15 (the left end portion in FIGS. 4 and 5, not shown), and a bearing in which the shaft portion is rotatably fitted. Since a fitting recess (not shown) is provided on a wall surface (not shown) of the air conditioning case 11, the shaft portion at the other end in the longitudinal direction of the hot water outlet tank 15 b of the heater core 15 is fitted to the bearing for the air conditioning case 11. Insert into the recess to be rotatable.

  In addition, a double pipe portion including the inner pipe 26 and the outer pipe 27 of the rotating portion 16 b located on one end side in the longitudinal direction of the hot water outlet tank 15 b of the heater core 15 is inserted into the through hole 34 of the air conditioning case 11.

  Thereafter, the annular portion 24 portion of the fixed portion 16a of the coaxial double pipe portion 16 is inserted into the through hole 34 from the outside of the air conditioning case 11 (right side in FIGS. 4 and 5), and the outer periphery of the inner pipe 22 of the fixed portion 16a. The surface is fitted to the inner peripheral surface of the inner pipe 26 of the rotating portion 16b, and the inner peripheral surface of the fixed-side annular portion 24 is fitted to the outer peripheral surface of the outer pipe 27 of the rotating portion 16b. Here, a sealing packing material 37 is interposed between the through hole 34 of the air conditioning case 11 and the annular portion 24 of the fixing portion 16a.

  As described above, both end portions in the longitudinal direction of the hot water outlet tank 15b of the heater core 15 can be rotatably supported by the air conditioning case 11, and a sealing property between the annular portion 24 and the through hole 34 of the fixed portion 16a can be secured.

  The rotation drive mechanism of the heater core 15 is provided on the side of the hot water inlet tank 15a located on the opposite side of the rotation center axis A of the heater core 15 as shown in FIGS. That is, a motor 35 that serves as a driving actuator is disposed outside the air conditioning case 11, and the rotation transmission speed reduction mechanism 36 that transmits the rotational output of the motor 35 to one end portion of the hot water inlet tank 15 a of the heater core 15 is provided in the air conditioning case. 11 through the wall surface of the air conditioning case 11 from the outside to the inside.

  The rotation transmission speed reduction mechanism 36 includes, for example, a male screw member that rotates by the rotation output of the motor 35, and a female screw member (nut) that meshes with the male screw member and moves in the axial direction of the male screw member by rotation of the male screw member. A mechanism that applies a rotational force to the end of the hot water inlet tank 15a of the heater core 15 based on the axial displacement of the female screw member can be used.

  The motor 35 is electrically connected to the output side of an air conditioning control device (not shown), and the rotation direction and the rotation amount (operation angle) of the motor 35 are controlled by the output of the air conditioning control device.

  Next, the operation of this embodiment will be described. When the motor 35 is operated, a rotational force is applied to the end of the heater core 15 on the side of the hot water inlet tank 15 a via the rotation transmission speed reduction mechanism 36 due to the rotation output of the motor 35.

  Here, in the heater core 15, the hot water outlet tank 15b located on the opposite side of the hot water inlet tank 15a is rotatable around the rotation center axis A, so that the rotational direction applied to the end of the hot water inlet tank 15a is increased. The heater core 15 is rotationally displaced by the force.

  Thus, since the heater core 15 rotates about the rotation center axis A by the rotation of the motor 35, the rotation position of the heater core 15 can be arbitrarily controlled by controlling the rotation direction and the rotation amount (operation angle) of the motor 35. As a result, the temperature of the air blown into the vehicle interior can be adjusted.

  Moreover, at the time of maximum cooling, the entire passage area in the air conditioning case 11 can be configured as a passage 18 through which cool air flows as shown in FIG. 1 (b), and at the time of maximum heating, the air conditioning case as shown in FIG. 3 (b). 11 can be configured as a passage through which warm air flows.

  Therefore, compared with a normal indoor air-conditioning unit with an air mix door, the maximum cooling performance and maximum heating performance can be achieved by increasing the amount of cool air blown air and hot air blown air by reducing the ventilation resistance during maximum cooling and maximum heating. Can be improved.

  In addition to this, in this embodiment, the coaxial double pipe portion 16 for warm water in / out is configured at one end of the heater core 15 (the end on the hot water outlet tank 15b side), and the central axis A of the coaxial double pipe portion 16 is The heater core 15 is rotated as the center, and the bypass passage mechanism 30 that directly communicates between the hot water inlet / outlet portions of the coaxial double pipe structure 16 is provided by effectively utilizing the configuration of the coaxial double pipe section 16. It is possible to demonstrate the effects.

  That is, when the heater core 15 is rotated to the maximum cooling position, as shown in FIG. 1B, the rotation side opening 31 overlaps with the fixed side opening 32 in the fully opened state, and the bypass passage mechanism 30 is fully opened. It becomes the communication state of.

  Therefore, the inlet pipe 25 that is the inlet of the coaxial double pipe structure 16 and the inner pipe 22 on the fixed side that is the outlet are in direct communication with each other by the bypass passage mechanism 30. Here, since the water passage resistance when the bypass passage mechanism 30 is fully opened is significantly smaller than the water passage resistance of the heater core 15 side hot water passage, the hot water flowing into the inlet pipe 25 is heated by the heater core 15 side hot water passage. As shown by an arrow Z in FIG. 4, the gas passes through the bypass passage mechanism 30 and flows to the inner pipe 22 side in a short circuit.

  Thereby, since the heat of the hot water is not released into the air flow from the heater core 15 at the maximum cooling, the temperature rise of the air flow h (see FIG. 1A) contacting the heater core 15 can be avoided, and the maximum cooling performance is more effective. Can demonstrate.

  In addition, the bypass passage mechanism 30 forms a bypass flow of warm water for the heater core 15 and does not block the warm water flow. Therefore, it is possible to prevent the warm water pressure from increasing during maximum cooling. For this reason, it is not necessary to increase the pressure strength of the coaxial double piping structure 16 as in the prior art, and the product cost can be reduced accordingly.

  On the other hand, at the time of temperature control and maximum heating when the rotation angle of the heater core 15 is equal to or greater than a predetermined value, the rotation side opening 31 is fixed to the fixed side opening 32 as shown in FIGS. 2 (b) and 3 (b). The bypass passage mechanism 30 enters a shut-off state by moving to a position away from the position. For this reason, since the total amount of hot water flowing into the inlet pipe 25 flows through the heater core 15 side hot water passage shown by an arrow W in FIG. 5, the air heating action by the heater core 15 can be exhibited without any trouble.

  By the way, immediately after the heater core 15 rotates from the maximum cooling position to the maximum heating side, the rotation-side opening 31 maintains the communication state with the fixed-side opening 32, so that the hot water bypass flow rate is large and the heater core 15 The hot water flow rate is low. When such a heater core low flow rate state occurs, the blowout temperature (warm air temperature) of the heater core 15 is greatly affected by disturbance conditions (air volume, engine-side hot water flow rate, etc.), and therefore based on the rotational position of the heater core 15. The temperature in the passenger compartment cannot be controlled well.

  Therefore, in the present embodiment, when the heater core 15 is rotated to the maximum cooling position, a storage portion 11a having a concave shape for storing the heater core 15 is formed in the air conditioning case 11 so that the heater core 15 can be fully cooled. A runway 17 that prevents air from flowing into the heater core 15 is formed while rotating a predetermined angle from the position.

  According to this, while the heater core 15 rotates by a predetermined angle from the maximum cooling position until it escapes from the storage portion 11a (running path 17), the rotation side opening 31 is moved to a small opening position where the rotation side opening 31 communicates with the fixed side opening 32. It can be rotationally displaced.

  As a result, when the heater core 15 escapes from the storage portion 11a (running path 17) and air inflow into the heater core 15 is started, the bypass flow rate of the hot water can be limited to a small amount. Thereby, since the flow rate of warm water to the heater core 15 can be increased to a sufficient amount from the start of air inflow to the heater core 15, it is possible to suppress the blowing temperature (warm air temperature) of the heater core 15 from being affected by disturbance conditions. .

  That is, in this embodiment, as understood from the above description, the maximum cooling position in the temperature control region of the heater core 15, i.e., the rotation region immediately after the heater core 15 escapes the storage portion 11 a (the runway 17). In the region adjacent to the rotation side opening 31, the communication state between the rotation side opening 31 and the fixed side opening 32 is maintained, but the rotation side opening 31 and the fixed side are set according to the setting of the storage portion 11 a (running path 17). Since the communication with the opening 32 is in a small opening state and the bypass flow rate of the hot water can be limited to a sufficiently small amount, the temperature control function is not hindered.

(Other embodiments)
(1) In the above-mentioned embodiment, since the rotation angle of the heater core 15 (rotating part 16b) cannot be sufficiently taken with respect to the circumferential lengths of the rotating side opening 31 and the fixed side opening 32, the temperature control region is unavoidable. Among them, on the side adjacent to the maximum cooling position, the rotation side opening 31 and the fixed side opening 32 are partially overlapped so that the bypass passage mechanism 30 communicates with a small opening degree. At this time, when the rotation angle of the heater core 15 is sufficient, it is preferable that the bypass passage mechanism 30 is shut off not only during maximum heating but also over the entire temperature control region.

  (2) In the above-described embodiment, in the coaxial double pipe section 16 for hot water in / out, the outer pipes 23 and 27 constitute a hot water inlet side flow path, and the inner pipes 26 and 22 constitute a hot water outlet side flow path. However, on the contrary, the outer pipes 23 and 27 may constitute a hot water outlet side flow path, and the inner pipes 26 and 22 may constitute a hot water inlet side flow path. In other words, the hot water flow direction W may be reversed in FIG.

  4 and 5, the hot water outlet tank 15b in the upper part of FIGS. 4 and 5 becomes a hot water inlet tank, the lower hot water inlet tank 15a in FIGS. 4 and 5 becomes a hot water outlet tank, and the hot water inlet pipe 25 It becomes a hot water outlet pipe. Accordingly, the coaxial double pipe portion 16 is disposed on the hot water inlet tank side.

  Also in this other example, the bypass passage mechanism 30 constituted by the rotation side opening 31 and the fixed side opening 32 can be similarly configured. However, the flow direction of the bypass hot water passing through the bypass passage mechanism 30 flows in the direction opposite to the arrow Z.

  (3) In the above-described embodiment, the rotation-side inner pipe 26 is fitted to the outer peripheral side of the fixed-side inner pipe 22 of the coaxial double pipe portion 16. The inner pipe 26 on the rotation side may be fitted to the inner peripheral side of the pipe 22.

  (4) In the above-described embodiment, the coaxial double pipe portion 16 for warm water in / out is arranged on one end side (on the warm water outlet tank 15b side) of the heater core 15, and the rotation center axis A of the heater core 15 is on one end side of the heater core 15. Although it is set on the (hot water outlet tank 15b side), the coaxial double pipe portion 16 for hot water in / out is arranged at the intermediate portion in the longitudinal direction of the connecting pipe 15f of the heater core 15, and the rotation center axis A of the heater core 15 is You may make it set to the intermediate position of the warm water inlet tank 15a and the warm water outlet tank 15b.

  (5) In the above-described embodiment, the rotating portion 16b of the coaxial double pipe portion 16 is integrated with the heater core 15 by brazing, but mechanical connecting means such as caulking the rotating portion 16b of the coaxial double pipe portion 16 is used. Thus, the seal may be fixed to the heater core 15 side with a sealing material interposed therebetween.

  (6) In the above-described embodiment, a so-called all-pass type (one-way flow type) is used as the heater core 15 in which hot water passes from the hot water inlet tank 15a through all the tubes 15c to the hot water outlet tank 15b. However, as the heater core 15, a front / rear U-turn type that makes a U-turn of the hot water flow in the front / rear direction of the air flow direction may be used, and the present invention may be applied to the front / rear U-turn type heater core 15.

  Similarly, as the heater core 15, a left / right U-turn type that makes a U-turn of the hot water flow in the left / right direction of the heater core (the left / right direction in FIGS. 4 and 5) is used. May be.

  (7) In the above-described embodiment, the fixing portion 16a of the coaxial double pipe portion 16 is formed separately from the air conditioning case 11, but both the fixing portion 16a and the air conditioning case 11 are resin members. The fixing portion 16a may be integrally formed with the air conditioning case 11 with resin.

  (8) In the above-described embodiment, the example in which the hot water of the vehicle engine is circulated to the heater core 15 has been described. However, the hot water heated by the in-vehicle heat source device such as a combustion heater or a fuel cell is supplied to the heater core 15. You may make it circulate.

  Further, hydraulic oil for hydraulic equipment or the like may be used as the heat source fluid to be circulated through the heater core 15 instead of hot water.

(A) is a schematic sectional drawing which shows the maximum cooling state of the indoor air-conditioning unit by one Embodiment of this invention, (b) is principal part sectional drawing which shows the maximum cooling state of the bypass passage mechanism of a coaxial double piping part. (A) is a schematic sectional drawing which shows the temperature control state of the indoor air-conditioning unit by one Embodiment of this invention, (b) is principal part sectional drawing which shows the temperature control state of the bypass passage mechanism of a coaxial double piping part. (A) is a schematic sectional drawing which shows the maximum heating state of the indoor air-conditioning unit by one Embodiment of this invention, (b) is principal part sectional drawing which shows the maximum heating state of the bypass passage mechanism of a coaxial double piping part. It is sectional drawing which shows the hot water flow path in the maximum cooling state of the heat exchanger for rotary heating by one Embodiment of this invention, and a coaxial double piping part. It is sectional drawing which shows the warm water flow path | route in the temperature control state of the rotary heating heat exchanger and coaxial double piping part by one Embodiment of this invention, and a maximum heating state.

Explanation of symbols

11 ... air conditioning case, 15 ... rotary heater core (heat exchanger for heating),
16 ... Coaxial double pipe part, 30 ... Bypass passage mechanism, 31 ... Rotation side opening part,
32: Fixed side opening.

Claims (5)

An air conditioning case (11) through which air flows;
A heating heat exchanger (15) that is rotatably arranged in the air conditioning case (11) and heats the air in the air conditioning case (11);
By changing the rotational position of the heating heat exchanger (15), the air volume ratio between the hot air passing through the heating heat exchanger (15) and the cold air bypassing the heating heat exchanger (15) is changed. In the air conditioner that adjusts the blown air temperature by adjusting,
An inlet channel for allowing a heat source fluid to flow into the heating heat exchanger (15) and an outlet channel for allowing the heat source fluid to flow out from the heating heat exchanger (15) are configured by a coaxial double pipe structure (16). And
The heating heat exchanger (15) is configured to be rotatable about the central axis (A) of the coaxial double pipe structure (16), and
When the heating heat exchanger (15) is rotated to the maximum cooling position, a bypass passage mechanism (direct communication between the inlet portion (25) and the outlet portion (22) of the coaxial double pipe structure (16)) 30) is configured in the coaxial double pipe structure (16),
An air conditioner characterized in that when the heating heat exchanger (15) is rotated from the maximum cooling position to the maximum heating position, the bypass passage mechanism (30) changes in a passage blocking direction. The coaxial double pipe structure (16) includes a rotating side pipe (26) that rotates integrally with the heating heat exchanger (15), and a fixed side pipe in which the rotating side pipe (26) is rotatably fitted. (22), a rotation side opening (31) provided in the rotation side pipe (26), and a fixed side opening (32) provided in the fixed side pipe (22),
The air conditioner according to claim 1, wherein the bypass passage mechanism (30) is constituted by the rotation side opening (31) and the fixed side opening (32). The fixed side pipe is an inner side fixed pipe (22),
The rotation side pipe is an inner rotation pipe (26) that is rotatably fitted to the inner fixed pipe (22),
The outlet portion is constituted by the inner fixed pipe (22),
An outer fixed pipe (23) is arranged at a predetermined interval on the outer peripheral side of the inner rotary pipe (26),
The air conditioner according to claim 2, wherein the inlet portion (25) is formed in the outer fixed pipe (23). A heat exchanger housing (15) that prevents air from flowing into the heating heat exchanger (15) until the heating heat exchanger (15) is rotated from the maximum cooling position to the maximum heating position by a predetermined angle. The air conditioner according to any one of claims 1 to 3, wherein 11a) is provided in the air conditioning case (11). The air conditioner according to any one of claims 1 to 4 is configured for a vehicle,
In the heating heat exchanger (15), hot water heated by an in-vehicle heat source device is circulated as the heat source fluid,
A vehicle air conditioner characterized in that air whose temperature has been adjusted by the rotational position of the heat exchanger (15) blows out into the passenger compartment.

Images