JP4650274B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner including a rotating portion in which a seal member is disposed between a rotating member and a fixed member.

  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 representative.

  In this air mix type vehicle air conditioner, the heater core itself, which is a heat exchanger for hot water heating, is configured to be rotatable so that the heater core also serves as an air mix door, thereby eliminating the air mix door. In addition, it has been proposed to increase the amount of cold air by rotating the heater core to a position where it does not provide resistance to the flow of cold air during maximum cooling.

  The present applicant proposed in Japanese Patent Application No. 2005-128275, an air conditioner that achieved a miniaturization of a heat source fluid input / output pipe connection structure such as hot water while ensuring a heater core rotating function. FIG. 7 shows the configuration of the air conditioner proposed in the prior application, and a coaxial having a fixing member 16a fixed to the air conditioning case 11 side and a rotating member 16b joined to the heater core 15 and rotated together with the heater core 15. A double pipe portion 16 is provided. Then, an O-ring 35 is disposed as a sealing member between the fixed member 16a and the rotating member 16b to prevent external leakage of the heat source fluid. The seal structure is a so-called circumferential seal structure in which the O-ring is in contact with the outer peripheral surface or the inner peripheral surface of the fixed member 16a and the rotating member 16b.

  However, in the circumferential seal structure, since the weight of the heater core 15 and the heat source fluid is applied to the lower portion of the O-ring 35 as a load F perpendicular to the direction of the rotation axis A, the following two problems arise. First, since the rotating member 16b comes into contact with the lower part of the O-ring 35, the crushing amount of the upper part of the O-ring 35 cannot be secured, and the possibility of external leakage of the heat source fluid occurs in the upper part of the O-ring 35. To do. Further, in order to prevent external leakage, when the diameter of the O-ring 35 is increased and the amount of crushing is increased (that is, the compression rate of the O-ring 35 is increased), the sliding resistance between the O-ring 35 and the rotating member 16b is increased. And the problem that the operation force at the time of rotating the heater core 15 will generate | occur | produce will occur.

  An object of the present invention is to provide a seal structure capable of preventing or suppressing fluid leakage and avoiding an increase in operating force, and to provide an air conditioner using the seal structure. To do.

In the first feature of the present invention, the heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are configured as a coaxial double pipe structure, and the rotating shaft (A) of the coaxial double pipe structure is provided. And the heat exchanger (15) is configured to be rotatable with respect to the air conditioning case (11), and is disposed on the outer peripheral side of the heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30). The outer side piping (31) integral with the heat exchanger (15), the stationary side outer piping (26) fixed to the air conditioning case (11) and communicating with the rotating side outer piping (31). The rotation axis (A) of the coaxial double pipe structure is formed in a direction perpendicular to the vertical direction, and is elastic between the rotation side outer pipe (31) and the fixed side outer pipe (26). An annular sealing member (35) made of a body is arranged, and the rotation side outside The pipe (31) includes a flange (34) extending outward in the vertical direction with respect to the rotation axis (A), and a seal surface (34a) in contact with the seal member (35) in the rotation side outer pipe (31) is provided. , A flat surface provided on one end surface of the flange part (34) in the direction of the rotation axis (A) and perpendicular to the rotation axis (A), and out of the space around the flange part (34) The seal member (35) is disposed only in the space between the portion (26e) facing the seal surface (34a) in (26) and the seal surface (34a), and the fastening side outer pipe (26) is fastened by fastening means. The flange (34) is sandwiched from both sides in the direction of the rotation axis (A) by the combined plate (27) and the fixed-side outer pipe (26).

In such a configuration, the load (F) in the direction perpendicular to the rotation axis (A) acting on the rotation side outer pipe (31) does not act on the seal member (35) via the seal surface (34a). . Therefore, even if a load (F) in a direction perpendicular to the rotation axis (A) acts on the rotation side outer pipe (31), the one-side contact of the seal member (35) is prevented or suppressed. Can be prevented or suppressed. In addition, since it is not necessary to increase the amount of crushing of the seal member (35), an increase in operating force when rotating the heat exchanger (15) can be avoided. Furthermore, since the minimum compression rate of the sealing member (35) can be managed, the heat source fluid leakage can be reliably prevented or suppressed.

  Further, a sliding resistance reducing member (37) for reducing sliding resistance can be disposed between the flange portion (34) and the plate (27).

  If it does in this way, the sliding between a plate (27) and a collar part (34) at the time of employ | adopting the structure which pinches | interposes a collar part (34) with a plate (27) and a fixed side outer side piping (26). Resistance can be reduced.

  In addition, the plate (27) can be provided with a protrusion (36) that protrudes toward the flange (34) and whose tip is formed in an arc shape.

  In this case, since the contact area between the plate (27) and the flange portion (34) is reduced, a configuration in which the flange portion (34) is sandwiched between the plate (27) and the fixed-side outer pipe (26) is adopted. The sliding resistance between the plate (27) and the flange (34) can be reduced.

  In addition, the seal member (35) can have an X-shaped cross section. In this way, since the so-called X-ring has a smaller reaction force than the O-ring generally used as the seal member (35), the operating force when rotating the heat exchanger (15) can be reduced. it can. In addition, since the X-ring has a structure that seals in two places, even if its own weight is applied, the X-ring is more flexible than the O-ring and seal reliability is improved.

  Further, the heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are arranged on one end side in the direction of the rotation axis (A) in the heat exchanger (15), and the heat exchanger (15) rotates. A shaft portion (15f) that is rotatably supported by the air conditioning case (11) can be integrally provided on the other end side in the shaft (A) direction.

  If it does in this way, a heat exchanger (15) will be by shaft part (15f) provided in the heat exchanger (15), heat source fluid inlet piping (26, 31), and heat source fluid outlet piping (25, 30). The air-conditioning case (11) is rotatably supported.

  The shaft portion (41a) includes a resin frame (41) that covers the outer peripheral portion of the heat exchanger (15) and holds the heat exchanger (15), and is rotatably supported by the air conditioning case (11). ) Are integrally provided on the frame (41), and the heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are arranged on one end side in the direction of the rotation axis (A) in the heat exchanger (15). And a shaft part (41a) can be arranged in the other end side of the axis of rotation (A) in a heat exchanger (15).

  In this way, the heat exchanger (15) includes the shaft portion (41a) provided in the frame (41), the heat source fluid inlet pipe (26, 31), and the heat source fluid outlet pipe (25, 30). The air conditioning case (11) is rotatably supported.

  The air conditioning case (11) includes an opening (20a) through which air can pass and a case-side sealing surface (20) formed around the opening (20a). Can be provided with a frame side seal member (42) that contacts the case side seal surface (20) when the heat exchanger (15) rotates to one side.

  In this way, at the time of so-called maximum heating, contact between the case-side sealing surface (20) and the frame-side sealing member (42) prevents air leakage from the outer peripheral portion of the heat exchanger (15), thereby increasing the maximum heating. The heating performance at the time can be improved.

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

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a schematic sectional view of an indoor air conditioning unit 10 of a vehicle air conditioner according to a first embodiment of the present invention.

  The indoor air conditioning unit 10 is disposed at a substantially central portion in the left-right direction of the vehicle inside an instrument panel (not shown) at the front of the vehicle interior. In addition, each arrow before and behind in FIG. 1 shows the direction in a vehicle mounting state. Further, the vertical direction in FIG. 1 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, it is the structure which has arrange | positioned the air blower part 12 integrally in the upper part of the vehicle front side among the air-conditioning cases 11. FIG. The blower unit 12 is configured to rotationally drive a centrifugal blower fan 12a by an electric motor (not shown). An inside / outside air switching box (not shown) is connected to the suction port of the blower fan 12a, and the introduced air (inside air or outside air) from the inside / outside air switching box is sent from the top to the bottom as indicated by the arrow a by the blower fan 12a. It is designed to blow air toward you.

  An evaporator 13 serving as a heat exchanger for cooling is disposed in a lower portion of the air conditioning case 11 on the front side of the vehicle. Here, the outer shape of the evaporator 13 is a rectangular parallelepiped thin shape, and the entire amount of air blown from the blower unit 12 passes as shown by an arrow b. As is well known, the evaporator 13 is a low pressure side heat exchanger of the vapor compression refrigeration cycle, and cools the passing air by absorbing heat from the passing air indicated by the arrow b and evaporating the low pressure refrigerant.

  A drain port 14 is provided at the lowest part of the bottom surface of the air conditioning case 11, and condensed water generated in the evaporator 13 is drained from the drain port 14 to the outside of the passenger compartment.

  In the air conditioning case 11, a heater core 15 is disposed on the leeward side of the evaporator 13. More specifically, the heater core 15 is disposed on the vehicle rear side of the evaporator 13 and in an upper portion. Here, the heater core 15 is a heating heat exchanger that heats air using hot water (engine cooling water) from a vehicle engine (not shown) as a heat source fluid.

  The heater core 15 is connected to a coaxial double pipe portion 16 for hot water entering / exiting to be described later, and the heater core 15 rotates relative to the air conditioning case 11 around the rotation axis A of the coaxial double pipe portion 16. ing. The coaxial double pipe portion 16 is disposed adjacent to the rear side of the upper end portion of the evaporator 13.

  A windshield wall 17 for maximum cooling is integrally formed in the air conditioning case 11 between the evaporator 13 and the heater core 15. The wind shielding wall 17 is formed in a plate shape that hangs vertically from a portion between the upper end portion of the evaporator 13 and the hot water outlet tank 15 a at the upper end portion of the heater core 15.

  The plate-shaped wind shielding wall 17 is formed in the entire area inside the air conditioning case 11 with respect to the vehicle left-right direction (the direction perpendicular to the plane of FIG. 1). Coupled to the side wall.

  The plate-shaped wind shielding wall 17 is formed in substantially the same area as the heater core 15 so as to cover the entire windward surface (left side surface in FIG. 1) of the heater core 15. A predetermined gap is set between the lower end portion of the wind shielding wall 17 and the hot water inlet tank 15b at the lower end portion of the heater core 15 and the bottom surface portion of the air conditioning case 11, and the air passage 18 on the upper side of the heater core is defined by the predetermined gap. Is formed. That is, the air passage 18 is formed in a region on the windward side with respect to the rotation operation region of the heater core 15.

  The heater core 15 is rotated to a broken line position MC along the leeward side surface (the right side surface in FIG. 1) of the wind shielding wall 17 during maximum cooling. In the maximum cooling position MC, the wind shielding wall 17 fully closes the windward surface of the heater core 15 and prevents the air on the leeward side of the evaporator 13 from passing through the core portion of the heater core 15.

  Accordingly, since the entire amount of the air passing through the evaporator (cold air) flows by bypassing the heater core 15 as indicated by the arrow c, the maximum cooling performance can be exhibited. For this reason, the air passage 18 on the upper side of the heater core acts as a heater core bypass passage during maximum cooling.

  Seal ribs 20 are formed on the leeward side of the heater core 15 on the inner wall surface of the air conditioning case 11. The seal rib 20 is integrally formed on the inner wall surface of the air conditioning case 11 and constitutes a case-side seal surface during maximum heating.

  Specifically, the seal rib 20 projects in a frame shape from the inner wall surface of the air conditioning case 11 toward the inside of the air conditioning case 11. An opening 20a through which air can pass is opened at the center of the frame-like protruding shape.

  During maximum heating, the heater core 15 is rotated to the alternate long and short dash line position MH, and the rectangular peripheral edge of the heater core 15 is pressed against the frame-like protruding shape of the seal rib 20. Thereby, the heater core bypass passage in which the air passage 18 and the opening portion 20a directly communicate with each other is blocked during maximum heating, and the opening portion 20a is formed between the hot water inlet tank 15b at the lower end portion of the heater core 15 and the inner wall surface of the bottom surface portion of the air conditioning case 11. The bypass air flow (cold air flow) c which goes directly to is cut off.

  For this reason, since the whole quantity of blowing air in the air conditioning case 11 passes through the core part of the heater core 15 and is heated, the maximum heating performance can be exhibited. The warm air d that has passed through the core portion of the heater core 15 passes through the opening 20a of the seal rib 20 and flows to the leeward side.

  Moreover, the solid line position in FIG. 1 of the heater core 15 is an example of an intermediate opening (intermediate rotation position) at the time of temperature control. Since the flow on the side bypasses the heater core 15 as indicated by the arrow c, and the upper flow of the evaporator passing air (cold air) passes through the heater core 15 and is heated as indicated by the arrow d ′, It becomes hot air d.

  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.

  After the cold air that bypasses the heater core 15 and the warm air that passes through the heater core 15 pass through the opening 20a of the seal rib 20 and are mixed in the upper region 21 of the seal rib 20, the air is conditioned at a desired temperature. , Flows into the blowout openings 22, 23, 24.

  Next, the arrangement of the blowout openings 22, 23, and 24 for blowing air to each part of the vehicle interior will be described. The blowout openings 22, 23, and 24 are arranged in the vehicle rear side portion of the blower unit 12 in the air conditioning case 11.

  The defroster opening 22 is disposed 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). Blow out.

  The face opening 23 is disposed at a rear side of the vehicle with respect to the defroster opening 22. The face opening 23 is divided into a center face opening (not shown) and a side face opening (not shown).

  A center face duct (not shown) is connected to the center face opening, and a front end outlet (center face outlet) of the center face duct is disposed at the center in the left-right direction of the vehicle instrument panel, from which the passenger face side Blow air into

  A side face duct (not shown) is connected to the side face opening, and a tip outlet (side face outlet) of the side face duct is arranged at both ends in the left-right direction of the vehicle instrument panel, from which the passenger face side Or air is blown out to the vehicle side window glass side.

  The foot opening 24 is disposed on the left and right side walls of the air conditioning case 11 and blows air to the feet of the occupant through a foot duct (not shown). The defroster opening 22, the face opening 23, and the foot opening 24 are opened and closed by a blowing mode door (not shown).

  Next, the heater core 15 and the hot / cold double pipe section 16 will be described. FIG. 2 is a cross-sectional view showing the heater core 15 and the coaxial double pipe portion 16 of FIG. 1, in which a hot water inlet tank 15 b is arranged at the lower end portion of the heater core 15 and a hot water inlet tank 15 a is arranged at the upper end portion of the heater core 15. Yes. And between these tanks 15a and 15b, the core part 15e of the all-pass type (namely, 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, the lower ends of all the flat tubes 15c communicate with the hot water inlet tank 15b, and the upper ends communicate with the hot water inlet tank 15a. . For this reason, the warm water flows in one direction from the warm water inlet tank 15b through all the flat tubes 15c in parallel to the warm water inlet tank 15a.

  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 11 is heated by passing through the gaps between the flat tubes 15c and the corrugated heat transfer fins 15d.

  A coaxial double pipe portion 16 is disposed on one end side of the hot water inlet tank 15a (extending direction in the tank longitudinal direction), and a coaxial double pipe portion is disposed on the other end side of the hot water inlet tank 15a. A cylindrical shaft portion 15 f is integrally provided coaxially with the 16 rotation axes A. The shaft portion 15 f is inserted into the hole of the air conditioning case 11 and is rotatably supported by the air conditioning case 11.

  Further, one end of the shaft portion 15 f is connected to a rotation drive mechanism (not shown) outside the air conditioning case 11. The rotational drive mechanism includes, for example, a power transmission mechanism such as a link mechanism and a gear mechanism coupled to the shaft portion 15f, and a drive mechanism such as a servo motor that applies a rotational driving force to the shaft portion 15f via the power transmission mechanism. Consists of. The rotation drive mechanism may be a manual mechanism that is operated by the manual operation force of the occupant.

  The coaxial double pipe section 16 is roughly divided into a fixing member 16a fixed to the air conditioning case 11 side by an unillustrated attachment means such as screwing and a rotating member 16b that is joined to the heater core 15 and rotates together with the heater core 15. . And most of the fixing member 16 a is located outside the air conditioning case 11, and the rotating member 16 b is located inside the air conditioning case 11.

  The fixed member 16a includes a cylindrical fixed side inner pipe 25 having a minimum diameter portion, a cylindrical fixed side outer pipe 26 positioned at a predetermined interval on the outer peripheral side of the fixed side inner pipe 25, and a thin disc shape. Plate 27. The fixed side inner pipe 25, the fixed side outer pipe 26, and the plate 27 of the fixing member 16a are coaxial with the rotation axis A as the center.

  An inlet pipe 28 that allows hot water from the vehicle engine to flow into the internal passage of the fixed side outer pipe 26 is coupled to the fixed side outer pipe 26. The inlet pipe 28 extends in a direction orthogonal to the rotation axis A.

  Further, the fixed side inner pipe 25 is coupled to an outlet pipe 29 that allows hot water to flow out from the internal passage of the fixed side inner pipe 25 to the vehicle engine. The outlet pipe 29 extends in a direction orthogonal to the rotation axis A. More specifically, the outlet pipe 29 extends to the outside of the fixed side outer pipe 26 across the internal passage of the fixed side outer pipe 26.

  In the fixing member 16a, a fixed side inner pipe 25, a fixed side outer pipe 26, an inlet pipe 28, and an outlet pipe 29 are integrally formed of a resin material.

  On the other hand, the rotating member 16b includes a cylindrical rotation-side inner pipe 30, a cylindrical rotation-side outer pipe 31 that is positioned on the outer peripheral side of the rotation-side inner pipe 30, and a rotation-side outer pipe 31. And a communication pipe 32 extending in a direction orthogonal to the rotation axis A from the outer peripheral portion of the rotation-side outer pipe 31. As for the rotation member 16b, the rotation side inner side piping 30, the rotation side outer side piping 31, and the connection piping 32 are integrally molded with the resin material.

  One end of the rotation side inner pipe 30 is fitted in a watertight manner so as to be rotatable on the inner peripheral side of the fixed side inner pipe 25 and so as not to leak water. The rotation side inner pipe 30 and the fixed side inner pipe 25 are Communicate. Of this rotating side inner pipe 30, the end opposite to the fixed side inner pipe 25 communicates with one end in the longitudinal direction of the hot water inlet tank 15a.

  The end of the rotation side outer pipe 31 is rotatably fitted to the inner peripheral side of the fixed side outer pipe 26, and the rotation side outer pipe 31 and the fixed side outer pipe 26 communicate with each other. Further, the communication pipe 32 communicates with one end in the longitudinal direction of the hot water inlet tank 15b through a hose or the like (not shown).

  In addition, the rotation side inner side piping 30 and the fixed side inner side piping 25 comprise the heat source fluid outlet piping of this invention. Further, the rotation side outer pipe 31 and the fixed side outer pipe 26 constitute a heat source fluid inlet pipe of the present invention.

  An arrow W in FIG. 2 indicates a hot water flow channel, and the hot water flowing into the inlet pipe 28 from the hot water circuit of the vehicle engine is the internal passage of the fixed outer pipe 26 → the inner passage of the rotary outer pipe 31 → the connecting pipe. It flows into the warm water inlet tank 15b through 32 internal passages. The hot water is distributed to the plurality of flat tubes 15c in the hot water inlet tank 15b, and flows in the plurality of flat tubes 15c from the bottom to the top.

  Hot water from the plurality of flat tubes 15 c flows into the hot water inlet tank 15 a and gathers, passes through the internal passage of the rotation-side inner pipe 30 → the internal passage of the fixed-side inner pipe 25, and flows out to the outlet pipe 29. Then, the warm water is returned to the warm water circuit of the vehicle engine.

  Next, the seal part 33 in the coaxial double pipe part 16 will be described. FIG. 3 is an enlarged cross-sectional view of the seal portion 33 in the coaxial double pipe portion 16 of FIG.

  As shown in FIG. 3, a disc-shaped flange 34 extending integrally outward in the direction perpendicular to the rotation axis A is integrally provided on the outer peripheral portion of the rotation side outer pipe 31.

  The fixed-side outer pipe 26 includes a cylindrical pipe part 26a that forms a passage through which hot water flows, and a bowl-like bowl-shaped circle that extends outward from the end of the pipe part 26a in the direction perpendicular to the rotation axis A. It has the ring part 26b and the cylindrical cylindrical ring part 26c extended in the rotating shaft A direction from the outer peripheral part of the bowl-shaped ring part 26b. The flange-shaped annular portion 26b is opposed to one end surface 34a of the flange portion 34 in the direction of the rotation axis A, and the cylindrical annular portion 26c is positioned on the outer peripheral side of the flange portion 34 so that the flange portion 34 is disposed. Covering.

  An annular groove 26c is formed on a surface of the flange-shaped annular portion 26b facing the one end surface 34a of the flange 34, and an annular seal member 35 made of an elastic body such as rubber is inserted into the groove 26d. Has been. As the seal member 35, a so-called O-ring having a circular cross-sectional shape is used. The seal member 35 is compressed in the direction of the rotation axis A and is in close contact with the bottom portion 26e of the groove 26d and the one end surface 34a of the flange portion 34. The bottom portion 26e and the one end surface 34a function as a seal surface. The hot water is prevented from leaking to the outside of the heavy piping portion 16.

  Here, the bottom portion 26e of the groove 26d and the one end surface 34a of the flange portion 34 are planes perpendicular to the rotation axis A. For this reason, even if a load F in the direction perpendicular to the rotation axis A (for example, the weight of the heater core 15) acts on the rotation-side outer pipe 31, the load F passes through the one end surface 34 a of the flange portion 34. It does not act on 35, and the contact of the seal member 35 is prevented or suppressed.

  Incidentally, the present embodiment adopting the prior application air conditioner (see FIG. 7) adopting a so-called circumferential seal structure and the above-described seal structure in which the load F in the direction perpendicular to the rotation axis A does not act on the seal member 35. When the operating torque when rotating the heater core 15 was evaluated, the operating torque of the air conditioner of this embodiment was reduced to 2/3 of the operating torque of the prior application air conditioner.

  A thin disc-like plate 27 is coupled to the end of the cylindrical annular portion 26c by fastening means such as screws (not shown). The plate 27 faces the other end surface 34 b of the flange portion 34 in the direction of the rotation axis A. More specifically, the flange portion 34 is sandwiched from both sides in the direction of the rotation axis A by the plate 27 and the flange-shaped annular portion 26b. In this case, when the flange 34 is in contact with the plate 27, the compression rate of the seal member 35 is minimized. That is, the minimum compression rate of the seal member 35 can be managed by sandwiching the collar portion 34 between the plate 27 and the collar-shaped annular portion 26b.

  On the surface of the plate 27 that faces the other end surface 34b of the flange portion 34, a projection portion 36 that protrudes toward the other end surface 34b of the flange portion 34 and has a tip formed in an arc shape is formed. By providing the projection 36, the contact area between the plate 27 and the flange 34 is reduced, so that the sliding resistance between the plate 27 and the flange 34 can be reduced.

  Of the surface of the plate 27 that faces the other end surface 34b of the flange 34, at least the surface of the projection 36 is coated with a sliding resistance reducing member 37 such as Teflon (registered trademark). Thereby, the friction coefficient between the plate 27 and the collar part 34 becomes small, and the sliding resistance between the plate 27 and the collar part 34 can be reduced.

  Note that the sliding resistance reducing member 37 may be coated on the other end surface 34 b of the flange portion 34. Alternatively, instead of forming the sliding resistance reducing member 37 by coating, a thin disk-shaped sliding resistance reducing member formed of Teflon (registered trademark) or the like is opposed to the other end surface 34 b of the flange portion 34 of the plate 27. You may attach to the surface to perform, or the other end surface 34b of the collar part 34. FIG.

(Second Embodiment)
A second embodiment of the present invention will be described. 4 is a perspective view of the heater core 15 and the coaxial double pipe portion 16 of the vehicle air conditioner according to the second embodiment, and FIG. 5 is a perspective view of the heater core 15 and the coaxial double pipe portion 16 of FIG. 4 viewed from different directions. It is. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the present embodiment, a joint pipe 38 is coupled to one end of the hot water inlet tank 15b on the side (extending direction in the tank longitudinal direction). The joint pipe 38 and the connection pipe 32 are connected by a hose 39. The hose 39 is fixed to the joint pipe 38 and the communication pipe 32 by a clamp 40.

  The heater core 15 is sandwiched between resin frame bodies 41. Specifically, the outer peripheral portions of the hot water inlet tank 15b and the hot water inlet tank 15a and both end surfaces of the core portion 15e in the tube stacking direction are covered with the frame body 41.

  The frame body 41 is integrally provided with a cylindrical shaft portion 41 a coaxially with the rotation axis A of the coaxial double pipe portion 16 at a position opposite to the coaxial double pipe portion 16. The shaft portion 41a is inserted into a hole of the air conditioning case 11 (see FIG. 2) and is rotatably supported by the air conditioning case 11. By providing this shaft portion 41a, the shaft portion 15f of the hot water inlet tank 15a in the first embodiment is abolished.

  A plate-like baffle plate 41 b extending toward the side wall portion of the air conditioning case 11 is integrally provided on the end surface of the frame body 41 on the coaxial double pipe portion 16 side. The baffle plate 41 b extends to a position where its tip is close to the side wall of the air conditioning case 11. And the baffle plate 41b prevents the air leakage from the space where the connecting pipe 32, the joint pipe 38, the hose 39 and the clamp 40 are arranged.

  On the leeward side surface of the frame body 41, a seal packing 42 is mounted as a square-shaped frame body side sealing member having an open central portion. When the heater core 15 is rotated to the maximum heating position, the seal packing 42 comes into contact with the seal rib 20 (see FIG. 2) of the air conditioning case 11, thereby preventing air leakage from the outer peripheral portion of the heater core 15. I have to.

  The frame body 41 is actually formed as a plurality of divided frame bodies for the convenience of resin molding, assembly, etc., and the plurality of divided frame bodies are fastened together by fastening means such as screws and clips. Thus, the frame body 41 is configured.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 6 is a cross-sectional view of the seal portion 33 of the vehicle air conditioner according to the third embodiment. The same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the first embodiment, an O-ring is used as the seal member 35, but in this embodiment, a so-called X-ring having an X-shaped cross section is used as the seal member 35. Since the X ring has a smaller reaction force than an O-ring generally used as a seal member, it is possible to reduce an operating force when the heater core 15 is rotated.

  Incidentally, the X-ring is used in a so-called circumferential seal structure using an O-ring with an O-ring (see FIG. 7) and a seal structure in which a load F in the direction perpendicular to the rotation axis A does not act on the seal member 35. When the operating torque when rotating the heater core 15 was evaluated for the air conditioner of this embodiment, the operating torque of the air conditioner of this embodiment was reduced to ½ of the operating torque of the prior application air conditioner.

  In addition, since the X-ring has a structure that seals in two places, even if its own weight is applied, the X-ring is more flexible than the O-ring and seal reliability is improved.

(Other embodiments)
In each of the above embodiments, hot water is introduced from the inlet pipe 28 and flows into the heater core 15, but hot water may be introduced from the outlet pipe 29 and flowed to the heater core 15. That is, the hot water flow direction W may be reversed in FIG.

  In each of the above embodiments, the rotation side inner pipe 30 is fitted to the inner peripheral side of the fixed side inner pipe 25, but on the contrary, the rotation side inner pipe 30 is connected to the outer peripheral side of the fixed side inner pipe 25. You may make it fit.

  In each of the above-described embodiments, the coaxial double pipe portion 16 and the shaft portions 15f and 41a for entering and exiting hot water are disposed on one end side (the hot water inlet tank 15a side) of the heater core 15, but the coaxial double pipe portion 16 and the shaft portion 15f are disposed. , 41a may be disposed at an intermediate portion of the heater core 15, that is, at an intermediate position between the hot water inlet tank 15b and the hot water inlet tank 15a.

  In each of the above embodiments, as the heater core 15, a so-called all-pass type (that is, a one-way flow type) is used in which hot water passes from the hot water inlet tank 15b through all the tubes 15c to the hot water inlet tank 15a. As the heater core 15, a front / rear U-turn type that makes a U-turn of the hot water flow before and after 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 and right U-turn type that makes a U-turn of the hot water flow in the left-right direction of the heater core (left-right direction in FIG. 2) is used, and the present invention is applied to the left-right U-turn type heater core 15. Good.

  In each of the above embodiments, the fixing member 16a of the coaxial double pipe portion 16 is formed separately from the air conditioning case 11. However, since the fixing member 16a and the air conditioning case 11 are both made of resin, the fixing member 16a is fixed. The member 16a may be integrally formed with the air conditioning case 11 with resin.

  In each of the above embodiments, 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 circulated to the heater core 15. It may be. 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.

It is a schematic sectional drawing of the indoor air-conditioning unit part 10 of the vehicle air conditioner which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the heater core 15 and the coaxial double piping part 16 of FIG. It is an expanded sectional view of the seal part 33 in the coaxial double piping part 16 of FIG. It is a perspective view of the heater core 15 and the coaxial double piping part 16 of the vehicle air conditioner which concerns on 2nd Embodiment of this invention. It is the perspective view which looked at the heater core 15 and the coaxial double piping part 16 of FIG. 4 from a different direction. It is sectional drawing of the seal part 33 of the vehicle air conditioner which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the principal part structure of the air conditioner proposed by the prior application.

Explanation of symbols

  Reference numeral 16a: a fixing member, 16b: a rotating member, 34a: one end face (seal surface), 35: a sealing member, A: a rotating shaft, F: a load.

Claims (8)

An air conditioning case (11) through which air flows;
A heat exchanger (15) rotatably disposed in the air conditioning case (11) and exchanging heat between the air and the heat source fluid;
A heat source fluid inlet pipe (26, 31) for allowing the heat source fluid to flow into the heat exchanger (15);
A heat source fluid outlet pipe (25, 30) for allowing the heat source fluid to flow out of the heat exchanger (15),
The heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are configured as a coaxial double pipe structure,
The rotation axis (A) of the coaxial double pipe structure is formed in a direction perpendicular to the vertical direction, and the heat exchanger (15) is arranged around the rotation axis (A) of the coaxial double pipe structure. It is configured to be rotatable with respect to the air conditioning case (11),
Of the heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30), the pipe arranged on the outer peripheral side is a rotary side outer pipe (31) integrated with the heat exchanger (15). The stationary-side outer pipe (26) that communicates with the rotating-side outer pipe (31) and is fixed to the air conditioning case (11).
An annular seal member (35) made of an elastic body is disposed between the rotation side outer pipe (31) and the fixed side outer pipe (26),
The rotation side outer pipe (31) includes a flange portion (34) extending outward in the vertical direction with respect to the rotation axis (A),
A seal surface (34a) in contact with the seal member (35) in the rotation side outer pipe (31) is provided on one end surface of the flange portion (34) in the direction of the rotation axis (A), and the rotation shaft (A ) Plane perpendicular to
Of the space around the flange (34), only in the space between the portion (26e) facing the seal surface (34a) and the seal surface (34a) in the fixed-side outer pipe (26), The sealing member (35) is disposed;
A configuration in which the flange portion (34) is sandwiched from both sides in the direction of the rotation axis (A) by a plate (27) coupled to the fixed-side outer pipe (26) by fastening means and the fixed-side outer pipe (26). The air conditioner characterized by being. The air conditioner according to claim 1 , wherein a sliding resistance reducing member (37) for reducing sliding resistance is disposed between the flange portion (34) and the plate (27). The air conditioning apparatus according to claim 2 , wherein the sliding resistance reducing member (37) is coated on one of the flange (34) and the plate (27). 4. The projection according to claim 1, wherein the plate is provided with a protrusion that projects toward the flange and has a tip formed in an arc shape. The air conditioner described in 1. The air conditioner according to any one of claims 1 to 4 , wherein the seal member (35) has an X-shaped cross section. The heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are arranged on one end side in the direction of the rotation axis (A) in the heat exchanger (15),
A shaft portion (15f) rotatably supported by the air conditioning case (11) is integrally provided on the other end side in the direction of the rotation shaft (A) in the heat exchanger (15). The air conditioner according to any one of claims 1 to 5 . A resin frame (41) that covers the outer periphery of the heat exchanger (15) and holds the heat exchanger (15);
A shaft portion (41a) rotatably supported by the air conditioning case (11) is provided integrally with the frame body (41).
The heat source fluid inlet pipe (26, 31) and the heat source fluid outlet pipe (25, 30) are arranged on one end side in the direction of the rotation axis (A) in the heat exchanger (15),
The air conditioning according to any one of claims 1 to 5 , wherein the shaft portion (41a) is disposed on the other end side in the direction of the rotation axis (A) in the heat exchanger (15). apparatus. The air conditioning case (11) includes an opening (20a) through which air can pass, and a case-side sealing surface (20) formed around the opening (20a).
The frame (41) is provided with a frame-side seal member (42) that contacts the case-side seal surface (20) when the heat exchanger (15) rotates to one side. The air conditioner according to claim 7 .

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