JP2002195784A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger having superior heat exchanging performance, in which pressure loss is small and the generation of vibration incident to flow of heat exchanging medium is suppressed. SOLUTION: A part of an end plate 1 is jointed to a flat tube 2. A channel plate 6 produced by drawing a planar body is integrated with the end plate 1. A channel, having a prescribed cross-sectional area suitable for flowing heat exchanging medium from one tank 23a or 23b via an opening 4 or 5 is formed of a part of joint of the channel plate 6 and the end plate 1. A block 7, having other channel for flowing heat exchanging medium from the other tank 23b or 23a, is fixed to the channel plate 6, and the other opening 5 or 4 is bonded to the end plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heat exchanger,
The present invention relates to a vehicle heat exchanger.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger generally has a structure in which flat tubes 100 and radiation fins 101 are alternately stacked as shown in FIG. 7, and end plates 102 are provided at both ends. . An inflow tank 103 and an outflow tank (not shown) are formed at one end of the flat tube 100. A flow path plate 104 is integrated with the end plate 102, and an inflow path 105 and an outflow path 106 are formed by the two. And the inflow path 105
The heat exchange medium that has flowed into the inflow tank 103 flows into the flat tubes 100 by being diverted and flows therethrough.
After being heat-exchanged with the air passing through the outside through the outlet tank, the air flows out of the outflow tank through the outflow passage 106.

[0003]

In the above-mentioned conventional heat exchanger, the inflow path 105 and the outflow path 106 are formed by the flow path plate 10.
4 obtained by drawing. However, the inflow channel 105 and the outflow channel 106 are adjacent to each other, and
4 is thin for the purpose of weight reduction and the like. For this reason, the throttle depth, that is, the inflow path 105 and the outflow path 106
If the cross-sectional area of the flow path is large, there is a problem that material breakage occurs. On the other hand, if the cross-sectional area of the flow path is reduced, there is a problem that the pressure loss increases and the sound passing through the heat exchange medium increases.

Further, an end plate 102, each tank 1
03 and the respective members such as the flow path plate 104 are independent of each other, so that it is difficult to perform positioning at the time of assembly with high accuracy. In addition, when the heat exchange medium flows into the inflow tank 103 from the inflow path 105, the flow direction is changed to a substantially right angle, so that a turbulent flow occurs. For this reason, the heat exchange medium flowing out of the inflow tank 103 is
In this case, it is difficult to divide the flow evenly to 00, and the heat exchange performance is deteriorated. Moreover, this adjustment is very difficult.

Accordingly, an object of the present invention is to provide a heat exchanger which has a small pressure loss, is excellent in heat exchange performance, and can suppress the generation of vibrations accompanying the flow of the heat exchange medium.

[0006]

According to the present invention, as a means for solving the above-mentioned problems, flat tubes and heat radiation fins are alternately laminated between two end plates and flow into an end of the flat tube. A tank and an outflow tank are formed, and the heat exchange medium flowing into the inflow tank through the opening formed in the end plate is caused to flow in the flat tube,
In the heat exchanger, after exchanging heat with the air passing through the outside through the radiation fins, and then flowing out from the outflow tank through another opening formed in the end plate, a part of the end plate is transferred to the flat tube. By joining, drawing the plate-shaped body, and integrating the end plate with the end plate, the heat exchange medium flowing out and in from one of the tanks through the opening with a part of the joint portion of the end plate is provided. A flow path plate that forms a flow path having a predetermined flow path cross-sectional area suitable for flowing, and attached to the flow path plate, joined to another opening of the end plate, and flows into and out of the other tank. And a block having another flow path through which the heat exchange medium flows.

[0007] According to this configuration, since one flow path to each tank is provided in the block, drawing of the flow path plate can be performed only for forming the other flow path. . Therefore, even if the squeezing depth is increased, the material other than the portion serving as the flow path is drawn in, and the material is not broken. In particular, the end plate
Since the portion that forms the flow channel with the flow channel plate is joined to the flat tube, the rigidity is increased, and it is possible to appropriately suppress the generation of vibration.

When a groove that forms a flow path with the flow path plate is formed in a part of the end plate, and a part of the wall surface that forms the groove is joined to the flat tube, the flow path cross-sectional area is further increased. Is large, and the flow of the heat exchange medium can be made smooth.

The end plate can be easily formed by press working if an opening portion to be joined to one of the tanks is formed by a throttle portion, and allows the heat exchange medium to flow in a desired state in the inflow tank. Can be. Therefore, the flow from the inflow tank to each of the flat tubes can be set to be evenly distributed, and the heat exchange performance can be improved. In addition, for the evaporators having different sizes, the equalization of the branch flow can be achieved only by changing to an end plate having a throttle portion having a different throttle ratio.

In the end plate, when the opening to be joined to one of the tanks is constituted by a plurality of through holes and a guide piece extending from an edge of the through hole, the heat exchange medium is brought into a desired flow state. It is preferable in that it becomes possible.

When the flow path formed by the end plate and the flow path plate is formed on a concentric circle centered on the opening to which the block is joined, a communication hole is formed at a desired position of the flow path plate. It is preferable in that it can be installed.

[0012]

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

FIG. 1 shows an evaporator which is an example of the heat exchanger according to the present embodiment. This evaporator has a configuration in which flat tubes 2 and heat radiation fins 3 are alternately stacked between two end plates 1.

As shown in FIG. 2, one end plate 1 is formed at one end thereof with a first arc-shaped groove 30 bulging toward the flat tube 2 side. Since the end plate 1 is made of a metal plate, the first circular groove 30 can be easily formed by press working. Further, a part of the wall surface forming the first circular arc groove 30 is joined to the flat tube 2 to increase the rigidity, and the outflow opening 5 (FIG.
See). An inflow opening 4 is formed at the center of the arc of the first arc groove 30 of the end plate 1 by press working (see FIG. 2).

The inflow opening 4 can be constituted by a throttle 31 shown in FIG. 5A or a guide piece 33 shown in FIG. 5B or 5C. First
It can be easily obtained by pressing simultaneously with the arc groove 30. The throttle portion 31 shown in FIG. 5A protrudes in a cylindrical shape so that the cross-sectional area of the flow path decreases toward a tank 23a described later. In this case, the squeezing rate has an appropriate value according to the size of the evaporator in the cross-sectional area of the flow path. Thereby, it is possible to set the heat exchange medium flowing from the throttle unit 31 to flow evenly into each flat tube 2. In FIG. 5B, the through-hole 3 is divided into four in a substantially elliptical area.
2 and a guide piece 3 from a part of the inner edge of each through hole 32.
3, the flow of the heat exchange medium is a swirling flow. Thereby, the heat exchange medium is transferred to each flat tube 2.
It is possible to make the fluid flow evenly. FIG.
In (c), a plurality of rectangular holes 34 and guide pieces 35 are formed by cutting and raising. The size and shape of the rectangular holes 34, the cut-and-raised positions and angles of the guide pieces 35 can be freely set so that the heat exchange medium can flow evenly into each flat tube 2.

At one end of the end plate, a flow path plate 6, a connection block 7, and a block expansion valve 8 (hereinafter abbreviated as block exhaust).
Are sequentially provided.

The flow path plate 6 is formed by pressing a metal plate material as shown in FIGS. 2 and 3.
A first opening 9 and a second opening 10 are formed. A cylindrical projection 11 is formed on the inner edge of the first opening 9.
The cylindrical projection 11 is in a state where the connection block 7 is fitted.
The end plate 1 is fitted into the inflow opening 4. Second
The opening 10 communicates with a second arc groove 12 formed on the same circumference around the first opening 9. The second circular groove 12 can be easily obtained by drawing a metal plate material. In this case, since the so-called material is drawn into the second arc groove 12 from a wide range around the region to be the second arc groove 12, the drawing depth can be increased. Therefore, it is possible to increase the cross-sectional area of the discharge flow path formed by the second circular groove 12 and the first circular groove 30 of the end plate 1, and it is possible to greatly reduce the pressure loss in this portion. Become.

As shown in FIG. 2, the connection block 7 has a substantially rectangular parallelepiped shape, and has an inflow path 13 and an outflow path 14 formed therein. The outlet of the inflow channel 13 is connected to the communication portion 15, and the inlet of the outflow channel 14 is connected to the second opening 10 of the flow path plate 6.

As shown in FIG. 2, the block exhaust 8 has a lead-out passage 16 and a first introduction passage 18 and a second introduction passage 19 which are connected by a communication hole 17.
The inlet of the outlet passage 16 is connected to the outlet of the connection block 7. The outlet of the second introduction passage 19 is connected to the inlet of the inflow passage 13 of the connection block 7.
The communication hole 17 is opened and closed by a ball 21 urged by a spring 20. The ball 21 opens and closes the communication hole 17 by the balance of the internal pressure acting by the action of the diaphragm 22 provided on the upper part, the urging force of the spring 20, and the internal pressure of the lead-out passage 16. Thus, the block exhaust 8 functions as a temperature expansion valve, and maintains the degree of superheat of the heat exchange medium in the evaporator at a constant value.

As shown in FIG. 4, the flat tube 2 is provided with two independent tank portions 23a and 23b at the upper end, and a flow passage communicating with both tank portions 23a and 23b is formed therein. Openings 24 are respectively formed in opposing surfaces constituting the tank portions 23a and 23b. When the flat tubes 2 and the radiation fins 3 are alternately stacked, the tank portions 23a and 23b communicate with each other through the opening 24,
Inflow tank 25 (see FIG. 2) and outflow tank (not shown)
Are formed.

The heat radiation fins 3 are formed by cutting and raising a plurality of louvers (not shown) in a belt-like thin plate made of aluminum or the like having excellent thermal conductivity, and deforming them so as to meander.

The evaporator having the above configuration is assembled as follows.

First, the flat tubes 2 and the radiation fins 3 are alternately laminated, and end plates 1 are provided at both ends.
The number of stacked flat tubes 2 and radiating fins 3 depends on the size of the evaporator depending on the type of vehicle. At this time, the inflow tank 25 and the outflow tank (not shown) are formed by the respective tank portions 23 of the flat tube 2 communicating with each other via the opening 24. Further, the fin 3 is not provided in a portion corresponding to the first arc groove 30 formed on one end side of the one end plate 1, and the wall surface constituting the first arc groove 30 is brought into contact with the flat tube 2.

Subsequently, the flow path plate 6, the connection block 7, and the block exhaust 8 are sequentially attached to one end of the one end plate 1 (the portion where the first arc groove 30 is formed). The flow path plate 6 has the cylindrical projection 11 of the first opening 9 fitted into the inflow opening 4 of the end plate 1, and the second arc groove 12 and the first arc formed in the end plate 1.
The outflow passage is temporarily fixed with the arc groove 30. In addition, the connection block 7 fits the communication portion 15 provided in the inflow passage 13 into the first opening 9 of the flow path plate 6 fitted in the inflow opening 4 of the end plate 1 and the outflow passage. The inlet 14 is temporarily fixed in a state of being connected to the second opening 10 of the flow path plate 6.

Thereafter, each temporarily fixed component is carried into the furnace, and each joint is brazed. Then, by screwing the block exhaust 8 to the connection block 7,
The evaporator is completed. The completed evaporator is connected to the heat exchange cycle of the vehicle and disposed in the air conditioning unit inside the vehicle.

As described above, when the flow path plate 6, the connection block 7, and the block exhaust 8 are mounted, they are fitted into the inflow opening 4 of the end plate 1 together with the cylindrical projection 11 of the flow path plate 6. The connection block 7 and the flow path plate 6 can be connected to the end plate 1 simply and accurately. Also, if the second opening 10 formed in the flow path plate 6 communicates with the second arc groove 12 formed on the same circumference centering on the first opening 9, the position where the second opening 10 is formed can be freely determined. Can be changed. Therefore, if the formation position of the second opening 10 is sufficiently considered, when the evaporator is installed in a vehicle after completion of the evaporator, the block exhaust 8
Of the diaphragm 22 can be reliably directed upward. Thereby, the diaphragm 22 is located on the lower side, and the oil leaked from the compressor contained in the heat exchange medium stays in the diaphragm 22 and the operation control is not difficult.

Next, the operation of the heat exchanger having the above configuration will be described.

A heat exchange medium flowing by driving a compressor (not shown) is first guided to a first introduction passage 18 of a block exhaust 8 by an evaporator, and a predetermined amount is passed through a second introduction passage 19 by the action of a diaphragm 22. Then, it flows into the inflow tank 25 from the first opening 9 of the end plate 1. The heat exchange medium is stored in the inflow tank 25 as shown in FIG.
Alternatively, it is possible to directly inflow at a predetermined injection angle through the first opening 9 having the configuration shown in FIG. Therefore,
The flow is equally divided into the flow paths of the flat tubes 2. And
While flowing through the flow path of the flat tube 2, the heat is exchanged with the air passing through the outside through the radiating fins 3, and then flows out to the discharge flow path through an outflow tank (not shown). As described above, the discharge flow path is formed to have a large flow path cross section by the first circular groove 30 and the second circular groove 12. Therefore,
Pressure loss in this part is suppressed, and turbulence due to a sudden change in the flow direction of the heat exchange medium can be reduced.
The generated passing sound is also reduced. End plate 1
Since a part of the wall surface constituting the first arc groove 30 formed in the above is directly joined to the flat tube 2 and the rigidity is improved,
It is possible to suppress the vibration generated due to the flow of the heat exchange medium.

In the above embodiment, the evaporator has been described as the heat exchanger. However, another heat exchanger, for example, a condenser which is a vehicle-side heat exchanger, may have the above-described configuration.

In the above embodiment, the space formed by the end plate 1 and the second circular groove 12 of the flow path plate 6 is used as the discharge flow path. However, this space can be used as the inflow flow path. It is.

Further, in the above embodiment, the first circular groove 30 is formed in the end plate 1, but the first circular groove 30 is not always required. That is, as shown in FIG. 6, one end side of the end plate 1 may be bent in a step shape and joined to the flat tube.

[0032]

As is apparent from the above description, according to the present invention, since the drawing process is performed so that only one flow path can be formed by the flow path plate, the material is broken even if the drawing depth is increased. This does not occur, and a desired flow path cross section can be secured. Therefore, it is possible to reduce the pressure loss and suppress the generation of the passing sound of the heat exchange medium. Further, since a part of the end plate is directly joined to the flat tube, the rigidity is increased, and it is possible to suppress the generation of vibrations due to the flow of the heat exchange medium.

[Brief description of the drawings]

FIG. 1 is a front view of an evaporator according to an embodiment.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a sectional view taken along line II of FIG. 2;

FIG. 4 is a plan view (a) and a side sectional view (b) of the flat tube shown in FIG.

FIG. 5 is a cross-sectional view showing an example (a) in which the inflow opening shown in FIG. 2 is configured by a throttle, an example (b) in which a guide piece is provided, and another example (c) in which a guide piece is provided. is there.

FIG. 6 is a partially enlarged sectional view showing another example of the evaporator.

FIG. 7 is a partial front view (a) and a side view (b) of a heat exchanger according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... End plate 2 ... Flat tube 3 ... Radiation fin 4 ... Inflow opening 5 ... Outflow opening 6 ... Flow path plate 7 ... Connection block 8 ... Block / Expan 11 ... Cylindrical projection 12 ... 1st circular arc groove 13 ... inflow passage 14 ... outflow passage 15 ... communication part 16 ... outflow passage 17 ... communication passage 18 ... first introduction passage 19 ... second introduction passage 23a, 23b ... tank part 30 ... second circular arc groove

Claims (5)

[Claims] 1. A flat tube and a heat radiating fin are alternately laminated between two end plates, and an inflow tank and an outflow tank are formed at ends of the flat tube. After flowing the heat exchange medium flowing into the inflow tank through the flat tube and exchanging heat with the air passing outside through the radiation fins, the heat exchange medium flows from the outflow tank through another opening formed in the end plate. In the heat exchanger, a part of the end plate is joined to the flat tube, a plate-like body is drawn, and integrated with the end plate to form a part of a joint part of the end plate. so,
A flow path plate forming a flow path having a predetermined flow path cross-sectional area suitable for the heat exchange medium flowing out and in from one of the tanks through the opening; A block having another flow path through which the heat exchange medium flowing into and out of the other tank is joined to the other opening of the plate. 2. A groove that forms a flow path with the flow path plate is formed in a part of the end plate, and a part of a wall surface that forms the groove is joined to the flat tube. The heat exchanger according to claim 1. 3. The heat exchanger according to claim 1, wherein the end plate has an opening that is joined to one of the tanks, and the opening is formed by a throttle. 4. The end plate according to claim 1, wherein an opening to be connected to one of the tanks includes a plurality of through holes and a guide piece extending from an edge of the through hole. 3. The heat exchanger according to 1 or 2. 5. A flow path formed by said end plate and said flow path plate is formed on a concentric circle centered on an opening to which said block is joined. A heat exchanger according to any one of the preceding claims.