JP2003254691A - Multiple heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deterioration of a life of a core part caused by accumulation of foreign matters such as dusts, in a multiple heat exchanger. <P>SOLUTION: Side plates 11d, 12d are arranged on the lower side of a core part 11' of a first heat exchanger 11 and the lower side of a core part 12' of a second heat exchanger 12. Top wall parts 11e, 12e constituting a joint face of fins 11b, 12b of the core parts 11', 12' are installed to the side plates 11d, 12d. A bottom wall part 11h positioned at a portion lower than the top wall parts (11e, 12e) by a predetermined dimension is installed to the side plates 11d, 12d. A foreign matter accumulation part 15 is configured to the side plates 11d, 12d at a core lower part between the first heat exchanger 11 and the second heat exchanger 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple heat exchanger in which a plurality of heat exchangers are integrally formed, and a condenser of a vehicle air conditioner and a radiator for cooling engine cooling water are integrated. It is effective when applied to the new dual heat exchanger for vehicles.

[0002]

2. Description of the Related Art In recent years, various types of vehicular double heat exchangers of this type have been proposed for the purpose of, for example, reducing the vehicular mounting space to improve vehicular mounting performance (for example, Japanese Unexamined Patent Application Publication No. H11 (1999) -111945).
No. 3,114,96).

According to this type of vehicle dual heat exchanger, the condenser and the radiator are integrated by integrating the condenser and the radiator, as compared with the case where the condenser and the radiator are separately mounted on the vehicle. The space between the condenser and the radiator can be reduced to reduce the total vehicle mounting space.

Here, since the engine cooling water temperature of the radiator is much higher than the refrigerant temperature of the condenser (high-pressure side refrigerant temperature of the refrigeration cycle), the cooling air (outside air) blown by the cooling fan is A condenser is arranged on the upstream side of the flow and a radiator is arranged on the downstream side.

[0005]

As described above, since the condenser and the radiator are arranged in series in the air flow direction, foreign matter such as dust in the air flow passes through the condenser after the air flow passes through the condenser. There is a phenomenon of falling downward due to collision with tubes or fins of the core part. When such foreign matter falls, foreign matter accumulates on the side plates of the condenser and the radiator and contacts the tubes and fins of the cores of the condenser and the radiator, promoting corrosion of the tubes and fins. Since the tubes and fins of the core part are very thin members, the promotion of corrosion due to the accumulation of foreign matter has a great influence on the shortening of the life of the heat exchanger.

In view of the above points, an object of the present invention is to prevent the life of the core portion from being shortened due to the accumulation of foreign matter such as dust in the duplex heat exchanger.

[0007]

In order to achieve the above object, in the invention described in claim 1, a core portion (11) composed of a tube (11a) and a fin (11b) for exchanging heat with air is used. ') Having a first heat exchanger (11) and an air flow downstream side of the first heat exchanger (11),
Tubes (12a) and fins (1) that exchange heat with air
A second having a core portion (12 ') composed of
A heat exchanger (12), and a side below the core portion (11 ') of the first heat exchanger (11) and below the core portion (12') of the second heat exchanger (12). Plate (11d, 1
2d) is arranged, and the fins (11b, 12b) of the core portions (11 ', 12') are arranged on the side plates (11d, 12d).
While providing the upper surface wall portions (11e, 12e) that form the joint surface with the side plates (11d, 12d),
A lower surface wall portion (11h) located at a position lower than the upper surface wall portions (11e, 12e) by a predetermined dimension is provided.
1h) constitutes a foreign matter accumulating portion (15) located at a lower portion of the core between the first heat exchanger (11) and the second heat exchanger (12).

According to this, the foreign matter accumulating portion (15) can be set at a position sufficiently lower than the upper surface wall portions (11e, 12e) constituting the fin joint surface by the lower surface wall portion (11h).
Therefore, even if foreign matter such as dust drops downward between the first and second heat exchangers (11, 12) and accumulates on the lower surface wall portion (11h), the accumulated foreign matter is generated in the core portion (11 '). , 12 ') fins (11b, 12b) and tubes (11a, 12)
It is possible to avoid contact with a). As a result, the corrosion of tubes and fins due to the accumulation of foreign matter such as dust is prevented,
The life of the duplex heat exchanger can be secured.

Moreover, the lower surface wall portion (11h) of the side plates (11d, 12d) constituting the foreign matter accumulation portion (15).
As a result, the lower part between the first and second heat exchangers (11, 12) can be closed. Therefore, as will be described later, the high temperature hot air is circulated by the arrow B in FIG. 1 and the first by the arrow C in FIG. The bypass air flow of the heat exchanger (11) can be prevented. Therefore, it is possible to prevent the performance deterioration of the first and second heat exchangers (11, 12) due to the high temperature hot air wraparound and the bypass air flow.

According to the invention described in claim 2, claim 1
In the second heat exchange between the upstream end of the lower surface wall portion (11h) and the upper surface wall portion (11e) on the first heat exchanger (11) side and the downstream end portion of the lower surface wall portion (11h). Vertical wall portions (11g, 12f) extending in the vertical direction are provided between the upper surface wall portion (12e) on the container (12) side and the lower surface wall portion (11).
h) and the vertical wall portion (11g) on the first heat exchanger (11) side
And the vertical wall portion (12f) on the side of the second heat exchanger (12), the foreign matter accumulating portion (15) may be formed in a substantially U-shape having an upper opening.

By constructing the substantially U-shaped foreign matter accumulating portion (15) having an opening at the upper side in the side plates (11d, 12d) as described above, the action and effect of claim 1 can be effectively exhibited.

According to the invention described in claim 3, claim 1
Or 2, the side plate (11d) on the side of the first heat exchanger (11) and the side plate (12d) on the side of the second heat exchanger (12) are separately configured, and the lower surface wall portion (11h) May be integrally formed on either one of the both side plates (11d).

According to the invention described in claim 4, claim 3
In the case where a bracket (16) integrally connecting the side plate (11d) on the first heat exchanger (11) side and the side plate (12d) on the second heat exchanger (12) side is provided, First and second via bracket (16)
The heat exchangers (11, 12) can be integrated (modularized).

According to the invention of claim 5, claim 1
1 to 4, the first heat exchanger (1
1) is specifically a condenser of a refrigeration cycle for vehicle air conditioning, and the second heat exchanger (12) is specifically a radiator of a vehicle engine.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a main part of a vehicle dual heat exchanger 10 according to the present embodiment. The dual heat exchanger 10 according to the present embodiment is a condenser 11 that cools high-pressure refrigerant in a refrigeration cycle of a vehicle air conditioner. And a radiator 12 for cooling the cooling water of the vehicle engine are integrally configured.

Since the temperature of the high pressure refrigerant in the refrigeration cycle of the vehicle air conditioner is usually lower than the temperature of the engine cooling water,
In the multiple heat exchanger 10, the condenser 11 is the radiator 12
On the other hand, it is arranged so as to be located on the upstream side in the air flow A direction. The condenser 11 constitutes the first heat exchanger of the present invention, and the radiator 12 constitutes the second heat exchanger of the present invention.

In order to cool the condenser 11 and the radiator 12 by using the vehicle running wind, the duplex heat exchanger 10 is mounted on the front side (front grill side) of the engine room of the vehicle. An axial flow type electric cooling fan 13 driven by an electric motor (not shown) is arranged downstream of the radiator 12.

The condenser 11 and the radiator 12 have basically the same structure, and tubes 11a and 12a having a flat cross section extending in the horizontal direction and fins 11b and 12b formed in a corrugated shape are alternately formed. The heat exchange core portions 11 'and 12' are formed by stacking a large number of layers in the vertical direction. Each fin 11b, 12b has a well-known louver 11c,
A plurality of 12c are obliquely cut and formed.

The tube 11a of the condenser 11 constitutes a fluid passage through which the high-pressure refrigerant of the refrigeration cycle flows, and the radiator 1
The second tube 12a constitutes a fluid passage through which engine cooling water flows. A header tank (not shown) is joined to both ends of each tube 11a, 12a in the longitudinal direction (direction perpendicular to the plane of FIG. 1) to distribute or collect fluid (refrigerant and cooling water) to each tube 11a, 12a. Has become. The fins 11b and 12b are each tube 11a,
The heat exchanging core portions 11 'and 12' of the condenser 11 and the radiator 12 are arranged between the tubes 11a and 12a and the fins. The heat exchange core part 1 is formed in a rectangular shape by a laminated structure of 11b and 12b.
Tubes 11a, 12a are provided at the upper and lower ends of 1 ', 12'.
And side plates 11d and 12 as reinforcing members made of a thick plate material that is sufficiently thicker than the fins 11b and 12b.
By disposing d, the condenser 11 and the radiator 12 are reinforced.

In FIG. 1, the lower side plate 11 is shown.
Only the d and 12d are shown, and the upper side plate 11
Illustration of d and 12d is omitted. Each member of the condenser 11 and the radiator 12 is made of an aluminum alloy, and the respective contact portions are joined by integral brazing.

By the way, the side plates 11d and 12d
Are arranged so as to extend over the entire area in the width direction (the direction perpendicular to the paper surface of FIG. 1) of the heat exchange core portions 11 ', 12'.
In other words, the side plates 11d and 12d are shaped to extend over the entire length of the tubes 11a and 12a in the longitudinal direction. And the side plates 11d, 12
The d basically has a U-shaped (inverted U-shaped) cross-sectional shape.

More specifically, the lower side plate 11
Describing the shapes of d and 12d, the lower side plates 11d and 12d are the lowermost fins 11b and 12b.
And upper wall portions 11e and 12e that are joint surfaces of the vertical wall portion 11 that hangs from both front and rear end portions of the upper wall portions 11e and 12e.
f, 11g, 12f, and 12g form a U-shaped basic cross-sectional shape with an opening at the bottom.

Further, in the lower side plate 11d of the condenser 11, of the front and rear vertical wall portions 11f and 11g, the vertical wall portion 11g on the air flow downstream side (radiator 12 side).
The lower surface wall portion 11h is added to the lower end portion of the. The lower surface wall portion 11h horizontally projects from the lower end portion of the vertical wall portion 11g toward the vertical wall portion 12f of the lower side plate 12d of the radiator 12, and the lower surface wall portion 11h includes the upper surface wall portion 11e. Predetermined dimension than 12e, eg mm
It is located in the lower part. And this lower surface wall portion 1
A minute gap 14 of about 3 mm is formed between the tip portion of 1 h and the vertical wall portion 12 f.

In this embodiment, the vertical wall portion 1 on the condenser 11 side.
1g, the lower wall portion 11h, and the vertical wall portion 12 on the radiator 12 side
With f, the foreign matter accumulating portion 15 having a U-shaped (U-shaped) cross-sectional shape with an open top is formed.

A bracket 16 for attachment to the vehicle body is assembled by means of fastening means such as bolts over both the condenser 11 and the side plates 11d, 12d below the radiator 12. A bracket for mounting on the vehicle body is similarly attached to the upper side plate (not shown) of the condenser 11 and the radiator 12. By attaching the brackets to the side plates 11d and 12d on both the upper and lower sides, the condenser 11 and the radiator 12 are integrated (modularized) as one double heat exchanger 10. The bracket 16 is the core part 1 for heat exchange.
1 ', 12' width direction (lower side plate 11d,
It is arranged at a plurality of locations (for example, two locations) in the longitudinal direction of 12d.

The lower cylindrical portion 16a of the bracket 16 is fitted into a fitting hole portion of an elastic member such as rubber provided in a fixing member of a vehicle body (not shown), and the bracket 16 is elastically supported by the fixing member of the vehicle body. It is about to be done.

The minute gap 14 absorbs a dimensional tolerance when the condenser 11 and the radiator 12 are integrally assembled (assembled into a module) via the bracket 16 and also collects water on the bottom surface of the foreign matter accumulating portion 15. Play a role in discharging.

Next, the operation and effect of this embodiment will be described. When the vehicle is at a standstill (when the engine is idle), the cooling air volume due to the running air is exhausted, so that the electric cooling fan 13 is put into operation and cooled by the fan 13. Air passes through the condenser 11 and the radiator 12 as shown by arrow A. In this case, since there is no running wind, the high-temperature hot air exhausted to the downstream side (the vehicle rear side) of the electric cooling fan 13 tries to go around to the fan intake side. Specifically, as shown by arrow B, high-temperature hot air tries to wrap around between the condenser 11 and the radiator 12, but the vertical wall portion 11 that constitutes the foreign matter accumulating portion 15
The g and 12f and the lower surface wall portion 11h can reliably prevent the hot air from flowing in the direction of the arrow B.

Further, since the running wind is small when the vehicle is running at a low speed, the electric cooling fan 13 is also activated.
When the vehicle is running at a low speed or when the vehicle is stopped, the electric cooling fan 13 operates to suck air, so that the condenser 11 may be bypassed as shown by an arrow C to form an air flow that is sucked into the radiator 12. Bypass airflow can also be reliably prevented by the vertical wall portions 11g and 12f and the lower surface wall portion 11h.

Therefore, it is possible to reliably prevent the above-mentioned hot air wraparound and the formation of the condenser bypass air flow by the vertical wall portions 11g and 12f and the lower surface wall portion 11h, and it is possible to ensure the good heat dissipation performance of the condenser 11 and the radiator 12.

Further, foreign matter such as dust in the air flow passing through the condenser 11 collides with the tubes 12a and the fins 12b of the core portion 12 'of the radiator 12, so that the front surface of the core portion 12' of the radiator 12 is prevented. The phenomenon that the side falls downward as shown by arrow D occurs.

Here, in the present embodiment, the lower surface wall portion 11h is arranged at a predetermined lower position with respect to the upper surface wall portion 11e forming the fin joint surface of the side plate 11d on the side of the condenser 11, and this surface wall portion 11h. The vertical wall portions 11g and 12f constitute the foreign matter accumulation portion 15. Therefore, the height of the bottom surface portion (that is, the lower surface wall portion 11h) of the foreign matter accumulating portion 15 becomes lower than the upper surface wall portion (fin joint surface) 11e by a predetermined amount. Therefore, the foreign matter 1 such as dust is collected on the bottom surface of the foreign matter accumulation section 15.
Even if 7 falls and accumulates, the accumulated foreign matter 17 does not come into contact with the tubes 11a and 12a of the core portions 11 'and 12' and the fins 11b and 12b in a short period of time.

As a result, the condenser 11 and the radiator 1
It is possible to prevent foreign matter such as dust from contacting the tubes 11a and 12a and the fins 11b and 12b of No. 2 to promote the corrosion of the tubes 11a and 12a and the fins 11b and 12b, thereby improving the durable life of the heat exchanger 10. Can be improved.

(Other Embodiments) The method of forming the foreign substance accumulating portion 15 is not limited to the above-described embodiment, but can be variously modified.

For example, in the above-mentioned embodiment, the vertical side wall 12f on the upstream side is formed on the lower side plate 12d on the radiator 12 side. However, the vertical side wall 12f on the upstream side is connected to the condenser 11 side. Alternatively, the lower side plate 11d may be integrally formed with the tip of the lower surface wall 11h.

Further, in the above-described embodiment, the lower surface wall 11h is formed integrally with the lower side plate 11d on the condenser 11 side, but this lower surface wall 11h is formed in the radiator 12.
It may be integrally formed with the lower end of the upstream side vertical wall portion 12f of the lower side plate 12d on the side. Furthermore, condenser 1
The vertical wall portion 11 on the lower side plate 11d on the first side
f may also be integrally formed with the lower side plate 12d on the radiator 12 side.

Further, in the above embodiment, the lower side plate 11d on the condenser 11 side and the lower side plate 12d on the radiator 12 side are separate bodies, but the condenser 11 side and the radiator 12 side are separated. Side plate 11d,
12d and 12d may be configured as an integral part having the foreign substance accumulating portion 15.

Further, in the above-mentioned embodiment, the present invention has been described by taking the double heat exchanger for vehicle 10 having the condenser 11 and the radiator 12 as an example, but the present invention is not limited to this and various embodiments are possible. It can be widely applied to multiple heat exchangers for various purposes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a vehicle dual heat exchanger according to an embodiment of the present invention.

[Explanation of symbols]

11 ... Condenser (1st heat exchanger), 12 ... Radiator (1st heat exchanger), 11 ', 12' ... Core part, 11a, 12a ... Tube, 11b, 12b ... Fin, 11d, 12d ... Side plate , 11e, 12e ... Upper surface wall portion, 11h ... Lower surface wall portion, 15 ...
Foreign matter accumulation section.

Claims (5)

[Claims] 1. A tube (11a) for exchanging heat with air.
(11 ') consisting of a core and fins (11b)
A first heat exchanger (11) having: and a tube (12a) and a fin (12b), which are arranged downstream of the first heat exchanger (11) in the air flow direction and exchange heat with air. A second heat exchanger (12) having a configured core portion (12 '), below the core portion (11') of the first heat exchanger (11), and the second heat exchanger. The core part (1) of the container (12)
The side plates (11d, 12d) are arranged on the lower side of 2 '), and the side plate (11d, 12d) has a joint surface with the fins (11b, 12b) of the core portion (11', 12 '). While providing the upper surface wall portion (11e, 12e) constituting the side plate (11d, 12d), between the first heat exchanger (11) and the second heat exchanger (12),
A lower surface wall portion (11h) located at a position lower than the upper surface wall portions (11e, 12e) by a predetermined dimension is provided, and the lower surface wall portion (11h) allows the first heat exchanger (1
A duplex heat exchanger, characterized in that it comprises a foreign matter accumulating portion (15) located below the core between the first heat exchanger (1) and the second heat exchanger (12). 2. The upstream end of the lower wall (11h) and the upper wall (11e) on the side of the first heat exchanger (11).
And a vertical wall portion (11g) extending in the vertical direction between the downstream side end portion of the lower surface wall portion (11h) and the upper surface wall portion (12e) on the second heat exchanger (12) side, respectively. 12
f) is provided, the lower surface wall portion (11h) and the first heat exchanger (11)
Side vertical wall portion (11 g) and the second heat exchanger (1
The double heat exchanger according to claim 1, characterized in that the foreign matter accumulating portion (15) is formed in a substantially U shape with an upper opening by the vertical wall portion (12f) on the 2) side. 3. The side plate (11d) on the side of the first heat exchanger (11) and the side plate (12d) on the side of the second heat exchanger (12) are configured separately from each other, and The lower wall portion (11h) is formed on both side plates (11h).
The double heat exchanger according to claim 1 or 2, wherein the double heat exchanger is integrally formed with either one of d and 12d). 4. A bracket (16) integrally connecting the side plate (11d) on the side of the first heat exchanger (11) and the side plate (12d) on the side of the second heat exchanger (12). ) Is provided, The dual heat exchanger of Claim 3 characterized by the above-mentioned. 5. The first heat exchanger (11) is a condenser of a refrigeration cycle for vehicle air conditioning, and the second heat exchanger (1).
2. The double heat exchanger according to claim 1, wherein 2) is a radiator of a vehicle engine.