JP2007001328A - Fixing device for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a fin due to a coming-off stopping piece when mounting a heater by inserting it into an opening formed in an air conditioning case. <P>SOLUTION: This coming-off stopping piece 21 is provided in the opening 20 of the air conditioning case 2. The length of the coming-off stopping piece 21 is made longer than pitch between tubes 24 of a heater core 5 inserted into the air conditioning case 2 from the opening 20. As a result, the coming-off stopping piece 21 is made to abut on only the tubes 24 to prevent the fin 24 from being damaged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of a fixing device for a heat exchanger such as a heater core.

    Conventionally, a heater such as a heater core is inserted through an opening of an air conditioning case and then fixed and assembled by a bracket or a clamp. In order to fix these with screws, parts such as screws and assembly man-hours were required. Therefore, it has been difficult to reduce the manufacturing cost of the air conditioner.

Therefore, the techniques shown in Patent Documents 1 and 2 have been proposed in order to reduce the number of parts and simplify the work man-hours. That is, as shown in Patent Document 1 and Patent Document 2, an opening 6 (insertion port 44) for attaching the heater core 5 (heat exchanger 2) is provided in the air duct 1 (casing 4), and the periphery of the opening 6 is elastic. The locking piece 2 (locking protrusion 45) is provided and is attached only by inserting the heater core, and the effect of not only reducing the number of components but also simplifying the mounting of the heater core 5 is achieved.
Japanese Utility Model Sho 62-167713 JP 2004-17941 A

  However, in the examples shown in Patent Documents 1 and 2, the length of the locking piece is smaller than the tube pitch of the heater core, and in that case, it may contact and crush the intervening fins between the tubes, and heat exchange It was also a cause of performance degradation.

  Then, this invention is providing the fixing device of the heat exchanger which can insert smoothly, without crushing the fin between tubes at the time of attachment in the air-conditioning case of a heater.

  In order to achieve the above object, an apparatus for fixing a heat exchanger according to the present invention is provided in an air conditioning case in which an air conditioner such as a cooler or a heater is accommodated. A retaining piece for locking the heater is provided at the opening end of the opening, and the length of the retaining piece is made larger than the tube pitch of the heater.

  As a result, when the heater is inserted into the opening of the air conditioning case, the length of the retaining piece is longer than the tube pitch of the heater, so the retaining piece only touches the end of the tube and does not contact the fin. Without crushing. The length of the retaining piece is preferably about twice the tube pitch of the heater (claim 2).

  Further, the retaining pieces are provided at two locations on the upper and lower ends of the opening (claim 3). Furthermore, it has an elastic action (claim 4).

  As described above, according to the present invention, since the length of the retaining piece is made larger than the tube pitch of the heater, the retaining piece is attached to the tube when inserted from the opening into the air conditioning case of the heater. Abuts but does not touch the fins and no longer crushes the fins. As a result, the cause of lowering the heat exchange performance could be removed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a side view of an automotive air conditioner 1 in which the present invention is implemented. This automotive air conditioner 1 adjusts the introduced air to a desired temperature and blows it out into the passenger compartment. The air conditioning case 2 includes an evaporator 4 that constitutes a cooling cycle, and engine cooling. A heater core (heater) 5 to which water is supplied, an air mix door (not shown) for determining the mixing ratio of cold air and hot air obtained from these, and a vehicle according to a blow-out mode in which temperature-controlled air is desired. A blowing mode door (not shown) that blows into the room is accommodated.

  The air conditioning case 2 is supplied with blown air from a blower unit (not shown) arranged on a side not shown, and blown from a connection port (not shown). Then, this air is cooled by the evaporator 4 and cooled to cool air, and then the heater core 5 is heated by a predetermined amount as compared to the air mix door opening to be warmed and cooled on the downstream side. And adjusted to the desired temperature. Then, according to the selected blowing mode, the air is blown into the vehicle interior from the vent air outlet 6, the defrost air outlet 7, and the foot air outlet 8, and air conditioning of the vehicle interior is performed.

Further, a blowout mode switching link mechanism 10 is provided on the outer surface of the air conditioning case 2, and the link mechanism 10 is provided with a large main link plate 11 and levers 12, 13, and 14 that are driven by the main link plate 11, respectively. Although not shown, the air-conditioning case 2 is rotatably attached to the attachment boss.

  In addition, 9 is a rotation shaft of the main link plate 11, 16 is a shaft for opening / closing control of the foot outlet 8, 17 is a shaft for opening / closing control of the vent outlet 6, and 18 is for opening / closing control of the defrost outlet 7. Although not shown, a control door is fixed to each shaft.

  Next, the configuration according to the present invention will be described. An opening 20 is formed in the air conditioning case 2 and a pair of retaining pieces 21 and 21 are provided above and below the end of the opening 20. The retaining pieces 21 and 21 are bent inward, and the tip is a contact end 21a.

  Therefore, the heater core 5 is inserted from the opening 20, and the retaining cores 21, 21 are locked to the tank 22 and fixed to the heater core 5. That is, as shown in FIG. 2, it is arranged in the air conditioning case 2, and its tip is inserted into the recess 23 of the air conditioning case 2.

  3 and 4, an example is shown in which the heater core 5 is inserted and attached to the opening 20 formed in the air conditioning case 2, and in FIG. 3, the heater core 5 is approximately half inserted into the opening 20. Thus, the pair of retaining pieces 21 and 21 provided at the top and bottom at the end of the opening 20 are spread outward by their own elastic action. That is, the contact ends 21 a of the retaining pieces 21, 21 are in contact with three of the tubes 24 of the heater core 5 and are expanded by receiving a reaction force from the tubes 24.

  The length (lateral length) D of the retaining piece 21 is about twice the pitch P between the tubes 24 of the heater core 5. Therefore, when the heater core 5 is inserted into the opening 20, the contact end 21 a of the retaining piece 21 does not come into contact with the fin 25, and damage such as crushing is not caused.

It is a side view of the air-conditioner for motor vehicles in which this invention is used. It is sectional drawing which shows the state by which the heater core is inserted in the air conditioning case. It is a perspective view which shows the state by which about half the heater core was inserted in opening formed in an air-conditioning case. It is explanatory drawing of the expansion which shows the relationship between a retaining piece and a tank in the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automotive air conditioner 2 Air conditioning case 4 Evaporator 5 Heater core 20 Opening 21 Retaining piece 21a Contact end 22 Tank 24 Tube 25 Fin

Claims (4)

In an air-conditioning case in which air-conditioning equipment such as a cooler and a heater is stored, an opening is provided in the air-conditioning case and a retaining piece for locking the heater at the opening end of the opening in order to store the heater. As
A fixing device for a heat exchanger, characterized in that the length of the retaining piece is larger than the tube pitch of the heater.   The fixing device for a heat exchanger according to claim 1, wherein the length of the retaining piece is about twice the tube pitch of the heater.   The fixing device for a heat exchanger according to claim 1, wherein the retaining pieces are provided at two positions above and below the opening end of the opening.   4. The heat exchanger fixing device according to claim 1, wherein the retaining piece has an elastic action.

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