JP4779858B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchange device that seals a case forming an air passage and a heat exchanger with a packing material, and is suitable as a seal structure for an evaporator in a vehicle air conditioner.

  Conventionally, as this type of seal structure, for example, as shown in Patent Document 1, among the outer parts of a rectangular heat exchanger, a first packing material located on the upper surface part and a second packing located on both side parts It is known that the material is formed separately and the first packing material and the second packing material are independently attached to the upper surface portion and both side surface portions of the heat exchanger, respectively.

By the way, in the said patent document 1, the temperature sensor for detecting the air temperature heat-exchanged in the air flow downstream vicinity of an evaporator is provided by the structure which can be replaced | exchanged from the outside of a case. That is, this temperature sensor is a sensor for detecting the frost state of the evaporator, and it is desired that the temperature sensor be easily arranged at a position where the accurate air temperature is blown out.
JP 2001-233047 A

  However, in the evaporator configured as described above, one of the fins arranged closest to the side surface is joined to the tube and the other is joined to the side plate. As a result, the fins arranged closest to the side surface tend to be relatively hot compared to the fins arranged on the inner side.

  In other words, since the fins on the inner side of the fins closest to the side face have tubes joined to both ends thereof, the fins closest to the side face with respect to the air temperature blown from the fins on the inner side than the fins closest to the side face. Generally, the temperature of air blown out from the fins is high.

  Therefore, in order to detect the optimum frost state of the evaporator, it is necessary to dispose a temperature sensor outside the case for inserting the sensor unit at a position deeper than the vicinity of the side wall of the case. Thereby, there exists a problem which the external shape of a temperature sensor becomes large and manufacturing cost rises.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchange device that can reduce the size of a temperature sensor.

In order to achieve the above object, the technical means described in claims 1 to 4 are employed. That is, in the first aspect of the invention, the case (1) that forms the air passage, the heat exchanger (3) that is disposed in the case and exchanges heat between the air and the heat exchange fluid, and the heat exchanger The first packing material (4, 5) located on the tank surface of (3) and the fin (34) arranged closest to the side surface among the inlet surface or outlet surface of the heat exchanger (3) are covered. The second packing material (6) pasted , and the heat exchanger is an evaporator (3) that cools the blown air when the low-pressure refrigerant of the refrigeration cycle absorbs heat from the blown air and evaporates. Has left and right side inner walls (40, 41) and rail-like accommodation portions that can receive the vicinity thereof, and the accommodation portion is formed between the two rib portions (2). The housing portion supports the evaporator via the second packing material, and the rib When the evaporator is disposed in the case, the protrusion height of the rib is formed so that the end of the rib portion substantially coincides with the same line of the tubes (35) arranged closest to the side surface of the evaporator. A temperature sensor (8) used for determining frost formation on the evaporator is arranged downstream of the air flow of the engine, and the temperature sensor is located closer to the inner wall surface of the case than the center of the evaporator. placed temperature sensing portion Rukoto which have a (8a) are characterized.

  According to the present invention, it is possible to prevent the relatively hot air from being blown out from the fins (34) arranged closest to the side surface of the heat exchanger (3), so that the vicinity of the side wall of the case (1) Even if a temperature sensor is arranged, the optimum frosted air temperature can be detected. Therefore, it is not necessary to use a temperature sensor in which the sensor unit is inserted deep from the case (1), so that the temperature sensor can be downsized.

  In the invention described in claim 2, the side plates (36) for fixing the fins (34) arranged closest to the side surface are provided on both side surfaces of the heat exchanger (3), and the second packing material is provided. (6) seals the gap between the case (1) and the side plate (36), and the fins (34) arranged closest to the side faces by the second packing material (6) extended on the extension. It is characterized by covering.

  According to the present invention, the second packing material (6) can seal between the heat exchanger (3) arranged in the case (1) and the air passage of the fin (34) closest to the side surface. Can be sealed. Therefore, it is possible to prevent the relatively hot air from being blown out from the fins (34) arranged closest to the side surface without increasing the number of parts.

  In the invention according to claim 3, the second packing material (6) covers more than half of the air passages of the ventilation passages of the fins (34) arranged closest to the side surface of the heat exchanger (3). It is characterized by.

  According to this invention, it is possible to prevent the relatively hot air from being blown out from the fins (34) arranged closest to the side surface. Note that the increase in ventilation resistance can be suppressed by covering at least about half of the air passage.

  The invention according to claim 4 is characterized in that the second packing material (6) is attached to at least the inlet surface of the heat exchanger (3). According to this invention, it is not necessary to cover the downstream side of the air flow of the heat exchanger (3), but the relatively hot air from the fins (34) arranged closest to the side surface by covering the upstream side of the air flow. Blowing out can be prevented.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a heat exchange device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan sectional view showing a seal structure between the case 1 and the evaporator 3 in the first embodiment. FIG. 2 is a perspective view showing the attachment positions of the packing materials 4, 5, 6 in the evaporator 3. FIG. 3 is a front view showing the overall configuration of the evaporator 3 of the vehicle air conditioner.

  In the present embodiment, the present invention is applied to a vehicle air conditioner. As shown in FIG. 3, the evaporator 3 that is a heat exchanger includes an upper and lower header tank 31 and a core portion 33. The core portion 33 includes a plurality of tubes 35 through which a refrigerant flows, a plurality of fins 34 formed in a waveform, and a tank plate 32.

  The fins 34 and the tubes 35 are alternately stacked in the longitudinal direction of the header tank 31, and are side plates as strength members that open in a U-shaped cross section further outward from the fins 34 arranged from the left and right side surfaces. 36 is arranged.

  The tank plate 32 is disposed so as to extend in the stacking direction of the plurality of tubes 35, and a plurality of insertion holes 37 serving as tube insertion portions are provided at positions corresponding to the ends of the tubes 35 in the longitudinal direction. The core portion 33 is formed by joining the end portion of the tube 35 to the insertion hole 37.

  Further, an insertion hole (not shown) is formed on the outermost side of the insertion hole 37 at a corresponding position in the longitudinal direction of the side plate 36, and the end of the side plate 36 is joined to the insertion hole to form the core portion. 33 is formed.

  An upper header tank 31 is connected to the upper tank plate 32 in the drawing, and a lower header tank 31 is connected to the lower tank plate 32 in the drawing by bonding. Each component of the evaporator 3 is formed of an aluminum-based material and is integrally joined by brazing.

  And the refrigerant | coolant decompressed by the expansion valve (not shown) provided in the upstream is flowed into the upper header tank 31, the gas which the refrigerant | coolant evaporated by flowing through the several tubes 35 and heat-exchanged with air. And flows into the lower header tank 31 and flows out from the lower header tank 31 to the downstream side of the external refrigeration cycle. The evaporator 3 having the above configuration is a cooling heat exchanger, and cools the blown air when the low-pressure refrigerant in the refrigeration cycle absorbs heat from the blown air and evaporates.

  Next, the case 1 that houses the evaporator 3 configured as described above will be described. Case 1 is a resin air-conditioning case, and an air passage is formed in the case. This air-conditioning case 1 is mounted in the center part inside a vehicle instrument panel. An air inlet portion (not shown) is provided on the side surface portion on the passenger seat side of the air conditioning case 1, and the evaporator 3 is disposed on the air flow downstream side of the air inlet portion in the air conditioning case 1. Blowing air from the unit flows into the evaporator 3 via the air inlet.

  Further, in the air conditioning case 1, a heating heat exchanger (not shown) is disposed on the downstream side of the air flow of the evaporator 3, and the cold air cooled by the evaporator 3 and the heating heat exchanger (see FIG. The temperature of the blown air is adjusted by adjusting the air volume ratio with the warm air heated by (not shown).

  Next, a seal structure between the evaporator 3 and the inner wall surface of the case 1 will be described with reference to FIGS. As shown in FIG. 2, the heat exchanger 3 includes a first tank surface 38, a second tank surface 39, a first side surface 40, a second side surface 41, an inlet surface 42 serving as an air flow upstream side, and an air flow downstream side. There are six exit surfaces 43.

  Among the six surfaces, a band-shaped packing material 5 extending along the tank longitudinal direction is attached to the central portion of the first tank surface 38. Further, a strip-shaped packing material 4 extending along the boundary with the first side surface 40, that is, along the short side direction of the tank is attached to one end of the first tank surface 38 in the longitudinal direction.

  Further, a band-shaped packing material 4 extending along the boundary with the second side surface 41, that is, along the short side direction of the tank is attached to the other end portion in the longitudinal direction of the first tank surface 38. . As a result, H-shaped packing materials 4 and 5 are arranged on the first tank surface 38 so as to provide an H-shaped sealing surface. Here, the packing materials 4 and 5 disposed on the first tank surface 38 are referred to as first packing materials 4 and 5.

  A belt-like packing material 6 is attached to the entrance surface 42 along the boundary with the first side surface 40. Further, a strip-shaped packing material 6 is attached to the entrance surface 42 along the boundary with the second side surface 41. As a result, a band-like range extending along the boundary between the side surfaces 40 and 41 of the inlet surface 42 is covered with the packing material 6, and a sealing surface is provided on both sides of the inlet surface 42.

  On the other hand, a strip-shaped packing material 6 is attached to the exit surface 43 along the boundary with the first side surface 40. Further, a strip-shaped packing material 6 is attached to the outlet surface 43 along the boundary with the second side surface 41. As a result, a band-like range extending along the boundary between the side surfaces 40 and 41 in the outlet surface 43 is covered with the packing material 6, and a sealing surface is provided on both sides of the outlet surface 43.

  A plurality of tubes 35 are arranged side by side on the inlet surface 42 and the outlet surface 43. An air passage is formed adjacent to each tube 35. As a result, a plurality of air passages are opened in the inlet surface 42 and the outlet surface 43. In each air passage, a heat exchange promoting member such as a wavy fin 34 can be arranged.

  Further, each of the plurality of packing materials 6 is pasted so as to close the air passage located at the extreme end of the inlet surface 42 and the outlet surface 43. In this shape, the packing material 6 is arranged so as to cover the fins 34 positioned at the extreme ends of the inlet surface 42 and the outlet surface 43. Here, the packing material 6 disposed on the first side surface 40 and the second side surface 41 is referred to as a second packing material 6.

  The heat exchange device having the above configuration includes the heat exchanger 3 and the packing materials 4, 5, and 6 attached to the heat exchanger 3. The packing material is arranged on the first tank surface 38 located on the upper side of the two tank portions of the heat exchanger 3, and the first packing materials 4, 5 that block the gap along the first tank surface 38. Prepare.

  The packing material further includes a second packing material that at least partially covers an end air passage extending along the boundary between the side surfaces 40 and 41 of at least one of the inlet surface 42 and the outlet surface 43 of the heat exchanger 3. 6 is provided. A dish-shaped packing material (not shown) is fitted into the second tank surface 39 of the evaporator 3.

  On the other hand, as shown in FIG. 1, the case 1 that houses the heat exchanger 3 has at least rail-like housing portions that can receive both side surfaces 40 and 41 of the heat exchanger 3 and the vicinity thereof. This accommodating portion can be formed between the two rib portions 2. Further, the accommodating portion has a depth enough to cover the packing material 6.

  The accommodating portion supports the heat exchanger 3 only through the packing materials 4, 5, 6, and makes direct contact between the heat exchanger 3 and the case 1, for example, direct contact between the side plate 36 and the case 1. It is formed to avoid.

  Furthermore, a temperature sensor 8 is disposed downstream of the air flow of the evaporator 3. This temperature sensor 8 detects the temperature of the evaporator 3 directly or indirectly. The temperature detected by the temperature sensor 8 is used to determine frost formation on the evaporator 3. The temperature sensor 8 has a temperature sensing unit 8 a at a position relatively close to the wall surface of the case 1 in the downstream region of the evaporator 3. The temperature sensing unit 8 a of the temperature sensor 8 is disposed at a position closer to the wall surface of the case 1 than the center of the evaporator 3.

  Next, the sizes of the packing materials 4, 5, 6 will be described. The size of the second packing material 6 in the width direction is preferably formed to a length connecting at least the end portion of the side plate 36 and the tubes 35 arranged closest to the side surface (W1 shown in FIG. 1). According to this, it can affix so that the air passage of the fin 34 arranged in the side surface 36 sidemost along the longitudinal direction of the side plate 36 may be covered.

  Furthermore, also in the protrusion height of the rib part 2 which forms an accommodating part, when the evaporator 3 is arrange | positioned in the case 1, the front-end | tip of the rib part 2 is substantially on the same line of the tube 35 arranged near the side surface. What is necessary is just to form so that it may correspond.

  Thus, the second packing material 6 can seal the gap between the inner wall surface on the left and right sides of the case 1 and the both side surfaces 40 and 41 of the evaporator 3, and the entire air passage of the fin 34 closest to the side surface. The second packing material 6 can be sealed. Therefore, it is possible to prevent the relatively hot air from being blown out from the fins 34 arranged closest to the side surface without increasing the number of parts.

  And the 1st packing materials 4 and 5 should just be formed so that it may become the same width dimension and the same board thickness among the sizes of the 2nd packing material 6 mentioned above. In other words, both the first packing materials 4 and 5 and the second packing material 6 can be obtained by changing the cutting length from the same elastic plate material. As a specific elastic material, a resin foam is optimal, and for example, cross-linked highly foamed polyethylene (polyethylene) is used.

  Further, the packing materials 4, 5, and 6 have an adhesive layer on one side of both the front and back surfaces, and a release paper (back paper) is attached to the surface of the adhesive layer. Thereby, after peeling the release paper, the packing material 4, 5, 6 can be bonded and fixed to each part of the evaporator 3 by sticking the adhesive layer to the pasting surface of each part of the evaporator 3.

  As a result, the packing materials 4, 5, 6 have the same width dimensions and the same plate thickness, and for example, the plate-like elastic material wound in a roll shape is pulled out from the rotating body and cut into a predetermined length. The packing materials 4, 5, 6 can be attached to each part of the evaporator 3 at a predetermined position relatively easily by using an automatic machine that can peel the release paper.

  According to the seal structure of the evaporator according to the first embodiment described above, the packing materials 4, 5, 6 are the first packing materials 4, 5 located on the first tank surface 38 of the evaporator 3, and the evaporator 3. The second packing material 6 is formed separately from the second packing material 6 positioned on the inlet surface 42 and the outlet surface 43, and the second packing material 6 is pasted so as to cover the fins 34 arranged closest to the side surface of the evaporator 3. ing.

  According to this, since it is possible to prevent the relatively high temperature air from being blown out from the fins 34 arranged closest to the side surface of the evaporator 3, the temperature sensor 8 is disposed in the vicinity of the side wall of the case 1. Can also detect the optimum frost air temperature. Therefore, since it is not necessary to use the temperature sensor 8 in which the sensor part is inserted deeply from the case 1, the temperature sensor 8 can be downsized.

  Further, a gap between the inner wall surface on the side of the case 1 and the side surface of the evaporator 3 is sealed by a second packing material 6 that seals between the case 1 and the side plate 36 of the evaporator 3 and extends over the extension. And the air passages of the fins 34 arranged closest to the side surface can be sealed. Therefore, it is possible to prevent the relatively hot air from being blown out from the fins 34 arranged closest to the side surface without increasing the number of parts.

(Second Embodiment)
In the first embodiment described above, the second packing material 6 is configured to be affixed at four locations on the inlet surface 42 and the outlet surface 43 before and after the air flow. However, the present invention is not limited to this, and the outlet surface 43 on the downstream side of the air flow. The 2nd packing material 6 arrange | positioned by (2) does not need to be formed so that the fin 34 arranged closest to the side surface may be covered.

  Specifically, as shown in FIG. 4, the tip of the rib portion 2 formed on the downstream side of the air flow is formed so as to be on the same line in the vicinity of the inside of the side plate 36, and the tip of the rib portion 2 is on the same line. The side plate 36 is attached to one end of the second packing material 6 so that According to this, by covering the air passages of the fins 34 arranged closest to the side surface with only the inlet surface 42, it is possible to prevent the relatively high temperature air from being blown out from the fins 34 arranged closest to the side surface. can do. Further, the side surface of the evaporator 3 on the downstream side of the air flow can be stably supported on the inner wall surface of the case 1 without play.

It is a plane sectional view showing the seal structure of case 1 and evaporator 3 in a 1st embodiment of the present invention. It is a perspective view which shows the sticking position of the packing materials 4,5,6 in the evaporator 3 in 1st Embodiment of this invention. It is a front view which shows the whole structure of the evaporator 3 of the vehicle air conditioner in 1st Embodiment of this invention. It is a plane sectional view showing the seal structure of case 1 and evaporator 3 in a 2nd embodiment of the present invention .

Explanation of symbols

1 ... Case, air conditioning case 3 ... Evaporator (heat exchanger)
4, 5 ... 1st packing material, packing material 6 ... 2nd packing material, packing material 34 ... Fin 36 ... Side plate

Claims (4)

A case (1) forming an air passage ;
A heat exchanger (3) disposed in the case for exchanging heat between the air and the heat exchange fluid;
A first packing material (4, 5) located on the tank surface of the heat exchanger (3);
A second packing material (6) affixed so as to cover the fins (34) arranged closest to the side surface of the heat exchanger (3) at the inlet surface or outlet surface ;
The heat exchanger is an evaporator (3) that cools the blown air by the low-pressure refrigerant of the refrigeration cycle absorbing heat from the blown air and evaporating.
The case has rail-shaped accommodation portions that can receive both side surfaces (40, 41) of the evaporator and the vicinity thereof on inner wall surfaces on the left and right sides, and the accommodation portion has two rib portions (2). Formed between
The housing portion supports the evaporator via the second packing material,
The protruding height of the rib portion substantially coincides with the same line of the tube (35) in which the tip of the rib portion is arranged closest to the side surface of the evaporator when the evaporator is disposed in the case. Formed as
A temperature sensor (8) used for determining frost formation on the evaporator is disposed downstream of the air flow of the evaporator, and the temperature sensor is located in the case more than the center of the evaporator. heat exchanger, characterized in Rukoto that Yusuke said temperature sensor located closer to the wall of the (8a). Side plates (36) for fixing the fins (34) arranged closest to the side surface are provided on both side surfaces of the heat exchanger (3),
The second packing material (6) seals between the case (1) and the side plate (36), and is closest to the side surface by the second packing material (6) extended on the extension. The heat exchange device according to claim 1, characterized in that it covers the fins (34) arranged.   The second packing material (6) covers more than half of the air passages of the ventilation passages of the fins (34) arranged closest to the side surface of the heat exchanger (3). The heat exchange apparatus of Claim 1 or Claim 2.   The heat exchange device according to any one of claims 1 to 3, wherein the second packing material (6) is attached to at least an inlet surface of the heat exchanger (3).

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