JP3499211B2 - Heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to heat exchangers, and in particular to
The present invention relates to a heat exchanger for a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a heat exchanger, as shown in FIG. 7, a flat tube 100 and a radiation fin 101 are alternately laminated, and end plates 102 are arranged at both ends. . An inflow tank 103 and an outflow tank (not shown) are formed at one end of the flat tube 100. A channel plate 104 is integrated with the end plate 102, and an inflow path 105 and an outflow path 106 are formed by both. Then, the inflow path 105
The heat exchange medium flowing from the inflow tank 103 into the inflow tank 103 is divided into the flat tubes 100 and flows, and the heat radiating fins 101
After heat exchange with the air passing through the outside through the outflow tank, the air is discharged from the outflow tank through the outflow passage 106.

[0003]

In the above conventional heat exchanger, the inflow passage 105 and the outflow passage 106 are connected to the flow passage plate 10.
It is obtained by the drawing process of No. 4. However, the inflow path 105 and the outflow path 106 are adjacent to each other, and moreover, the flow path plate 10
4 is thin for the purpose of weight reduction and the like. Therefore, the throttle depth, that is, the inflow path 105 and the outflow path 106.
There is a problem that material breakage occurs when the cross-sectional area of the channel is increased. On the other hand, if the cross-sectional area of the flow path is suppressed to be small, there is a problem that the pressure loss becomes large and the passing sound of the heat exchange medium becomes large.

Further, the end plate 102 and each tank 1
Since the members such as 03 and the flow path plate 104 are independent of each other, it is difficult to perform positioning with high accuracy during assembly. In addition, when the heat exchange medium flows into the inflow tank 103 from the inflow passage 105, the flow direction is changed to a substantially right angle, so that it becomes a turbulent flow. Therefore, the heat exchange medium flowing out from the inflow tank 103 is
It becomes difficult to evenly split the heat transfer fluid to 00, resulting in deterioration of heat exchange performance. Moreover, this adjustment is very difficult.

Therefore, an object of the present invention is to provide a heat exchanger having a small pressure loss and excellent heat exchange performance, and capable of suppressing the occurrence of vibrations accompanying the flow of the heat exchange medium.

[0006]

According to the present invention, as means for solving the above-mentioned problems, flat tubes and heat radiation fins are alternately laminated between two end plates, and the flat tubes and the radiation fins flow into the ends of the flat tubes. A tank and an outflow tank are formed, and the heat exchange medium that has flowed into the inflow tank through the opening formed in the end plate is caused to flow in the flat tube,
In a heat exchanger in which heat is exchanged with the air passing through the outside through the radiation fins, and then flows out from the outflow tank through another opening formed in the end plate, a part of the end plate is exchanged with the tank. By joining to the flat tube at a position other than the joining part, drawing the plate-like body, and integrating the end plate, the joining part at a position other than the joining part of the end plate with the tank And a part of the flow path plate forming a flow path having a predetermined flow path cross-sectional area suitable for flowing the heat exchange medium flowing in and out from one tank through the opening, and the flow path plate Attached to the other end of the end plate and having another flow path through which the heat exchange medium flowing in and out of the other tank flows.

According to this structure, since one flow path to each tank is provided in the block, the drawing process to the flow path plate can be performed only for forming the other flow path. . Therefore, even if the throttle depth is increased, the material other than the portion to be the flow path is drawn in, and the material does not break. In particular, the end plate
Since the portion forming the flow path together with the flow path plate is joined to the flat tube, the rigidity is increased and it is possible to appropriately suppress the occurrence of vibration.

If a groove portion which 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 forming the groove portion 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, which is preferable.

In the end plate, if the opening portion joined to the opening of one tank is located in the opening of the tank and is constituted by the throttle portion whose flow passage cross-sectional area can be freely set, it is easy to perform the press working. The heat exchange medium can be made to flow in a desired state in the inflow tank. Therefore, the split flow from the inflow tank to each flat tube can be set so as to be performed uniformly, and the heat exchange performance can be improved. Further, equalization of the diversion can be achieved by changing the evaporators having different sizes to the end plates having the throttle portions having different throttle ratios.

[0010]

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 because it can be provided.

[0012]

DETAILED DESCRIPTION OF THE INVENTION 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 a heat exchanger according to this embodiment. This evaporator has a configuration in which flat tubes 2 and heat radiation fins 3 that are alternately laminated are arranged between two end plates 1.

As shown in FIG. 2, one end plate 1 is provided with a first arc groove 30 bulging toward the flat tube 2 side at one end side. Since the end plate 1 is made of a metal plate material, the first arc groove 30 can be easily formed by press working. Further, a part of the wall surface forming the first arc groove 30 is joined to the flat tube 2 in order to enhance the rigidity, and there is the outflow opening 5 (see FIG. 3).
(See) has been drilled. Further, an inflow opening 4 is formed by pressing at the center of the arc of the first arc groove 30 of the end plate 1 (see FIG. 2).

The inflow opening 4 can be constituted by the throttle portion 31 shown in FIG. 5 (a) or the guide piece 33 shown in FIG. 5 (b) or (c). First
It can be easily obtained by pressing at the same time as the arc groove 30. The throttle portion 31 shown in FIG. 5A projects in a tubular shape so that the flow passage cross-sectional area becomes smaller toward the tank 23a side described later. In this case, the throttling ratio is an appropriate value depending on the size of the evaporator in the cross-sectional area of the flow path. This makes it possible to set the heat exchange medium that flows in from the narrowed portion 31 so as 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 is provided, and the guide piece 3 is formed from a part of the inner edge of each through hole 32.
With the configuration in which 3 is extended, the flow of the heat exchange medium is a swirl flow. As a result, the heat exchange medium is transferred to each flat tube 2
It is possible to make it flow evenly. Figure 5
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 hole 34, the cut-and-raised position and the angle of the guide piece 35 can be freely set so that the heat exchange medium can be evenly flowed to each flat tube 2.

Further, on one end side of the end plate, the flow path plate 6, the connection block 7, and the block expansion valve 8 (hereinafter, abbreviated as block / expan).
Are provided in sequence.

As shown in FIGS. 2 and 3, the flow path plate 6 is formed by pressing a metal plate material.
A first opening 9 and a second opening 10 are provided. A cylindrical projection 11 is formed on the inner edge of the first opening 9.
The cylindrical projection 11 is in a state in which the connection block 7 is fitted,
It is fitted into the inflow opening 4 of the end plate 1. Second
The opening 10 communicates with a second arc groove 12 formed on the same circumference with the first opening 9 as the center. The second arc groove 12 can be easily obtained by drawing a metal plate material. In this case, a so-called material is drawn into the second arc groove 12 from a wide range around the area to be the second arc groove 12, so that the drawing depth can be increased. Therefore, the flow passage cross-sectional area of the discharge flow passage formed by the second circular arc groove 12 and the first circular arc groove 30 of the end plate 1 can be made large, and the pressure loss at this portion can be significantly suppressed. 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. The outlet of the inflow passage 13 is connected to the communication portion 15, and the inlet of the outflow passage 14 is connected to the second opening 10 of the passage plate 6.

As shown in FIG. 2, the block / exhaust pan 8 is provided with a lead-out passage 16 and a first introduction passage 18 and a second introduction passage 19 which are communicated with each other by a communication hole 17.
The inlet of the outlet passage 16 is connected to the outlet of the connection block 7. Further, 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 biasing force of the spring 20, and the internal pressure of the outlet passage 16. As a result, the block / expan 8 plays the role of a temperature expansion valve and maintains the superheat degree of the heat exchange medium in the evaporator at a constant value.

As shown in FIG. 4, the flat tube 2 has two independent tank portions 23a and 23b at the upper end thereof, and a flow path communicating with both tank portions 23a and 23b is formed inside. An opening 24 is formed in each of the facing surfaces forming the tank portions 23a and 23b. Then, when the flat tubes 2 and the radiation fins 3 are alternately laminated, the tank portions 23a and 23b communicate with each other through the openings 24,
Inflow tank 25 (see FIG. 2) and outflow tank (not shown)
And are formed.

The radiating fin 3 is formed by cutting and raising a strip-shaped thin plate made of aluminum or the like having excellent thermal conductivity to form a plurality of louvers (not shown) and deformed so as to meander as in the prior art.

The evaporator having the above construction is assembled as follows.

First, the flat tubes 2 and the radiation fins 3 are alternately laminated, and the end plates 1 are arranged at both ends.
The number of the flat tubes 2 and the heat radiation fins 3 stacked depends on the size of the evaporator depending on the vehicle type. At this time, the tank portions 23 of the flat tube 2 communicate with each other through the openings 24, so that an inflow tank 25 and an outflow tank (not shown) are formed. Further, the fin 3 is not provided in the portion corresponding to the first circular arc groove 30 formed on the one end side of the one end plate 1, and the wall surface forming the first circular 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 expander 8 are sequentially attached to one end side of the one end plate 1 (the portion where the first arc groove 30 is formed). In the flow path plate 6, the cylindrical projection 11 of the first opening 9 is fitted into the inflow opening 4 of the end plate 1 to form the second arc groove 12 and the first plate formed in the end plate 1.
The arc groove 30 is temporarily fixed so that an outflow passage can be formed. In addition, the connection block 7 fits the communication part 15 provided in the inflow path 13 into the first opening 9 of the flow path plate 6 fitted into the inflow opening 4 of the end plate 1, and the outflow path. The inlet 14 is temporarily fixed while being connected to the second opening 10 of the flow path plate 6.

Then, the temporarily fixed components are carried into the furnace, and the joints are brazed. Then, by screwing the block / expan 8 to the connection block 7,
The evaporator is completed. The completed evaporator is connected to the heat exchange cycle of the vehicle and is arranged in the vehicle interior air conditioning unit.

As described above, when the flow path plate 6, the connection block 7 and the block expander 8 are attached, the tubular projection 11 of the flow path plate 6 and the inflow opening 4 of the end plate 1 are fitted together. The connection block 7 and the flow path plate 6 can be easily and accurately connected to the end plate 1. Further, if the second opening 10 formed in the flow path plate 6 communicates with the second circular arc groove 12 formed on the same circumference with the first opening 9 as the center, the position where the second opening 10 is formed can be freely set. It can be changed. Therefore, if the formation position of the second opening 10 is sufficiently studied, the block / evaporator 8 can be installed in the vehicle after the evaporator is completed.
The diaphragm 22 can be reliably directed upward. As a result, 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 does not become difficult.

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

The heat exchange medium which is made to flow by driving a compressor (not shown) is first introduced into the first introduction passage 18 of the block / expan 8 by the evaporator, and a predetermined amount is passed through the second introduction passage 19 by the action of the diaphragm 22. Through the first opening 9 of the end plate 1 into the inflow tank 25. The heat exchange medium is stored in the inflow tank 25 as shown in FIG.
Alternatively, it is possible to directly inject at a predetermined injection angle through the first opening 9 having the configuration shown in FIG. Therefore,
The flow is evenly divided into the flow paths of the flat tubes 2. And
While flowing through the flow path of the flat tube 2, heat is exchanged with the air passing through the outside through the radiation fins 3, and then flows out to the discharge flow path through the outflow tank (not shown). As described above, the discharge flow channel is formed to have a large flow channel cross section by the first circular arc groove 30 and the second circular arc groove 12. Therefore,
The pressure loss in this portion is suppressed, and the turbulence due to the abrupt change in the flow direction of the heat exchange medium can be alleviated.
The generated passing sound is also reduced. Also, the end plate 1
Since a part of the wall surface forming the first arc groove 30 formed in the above is directly joined to the flat tube 2 to improve the rigidity,
It is possible to suppress the vibration that occurs with the flow of the heat exchange medium.

Although the evaporator has been described as the heat exchanger in the above embodiment, another heat exchanger, for example, a condenser which is a heat exchanger on the outside of the vehicle may be configured as described above.

Further, in the above embodiment, the space formed by the end plate 1 and the second arcuate groove 12 of the flow path plate 6 was used as the discharge flow path, but it can also be used as the inflow flow path. Is.

Furthermore, in the above embodiment, the first arc groove 30 is formed in the end plate 1, but the first arc groove 30 is not always necessary. That is, as shown in FIG. 6, one end of the end plate 1 may be bent in a stepped shape to be joined to the flat tube.

[0032]

As is apparent from the above description, according to the present invention, the drawing is performed so that only one flow path can be formed by the flow path plate. Therefore, even if the drawing depth is large, the material is not broken. It does not occur, and it becomes possible to secure a desired flow path cross section. Therefore, it is possible to reduce the pressure loss and suppress the generation of the passing sound of the heat exchange medium. Moreover, 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 occurrence of vibration accompanying the flow of the heat exchange medium.

[Brief description of drawings]

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

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

3 is a cross-sectional view taken along line I-I of FIG.

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

5 is a cross-sectional view showing an example (a) in which the inflow opening shown in FIG. 2 is composed of a throttle part, 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 cross-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]

1 ... End plate 2 ... Flat tube 3 ... Radiating fin 4 ... Inflow opening 5 ... Outflow opening 6 ... Flow path plate 7 ... Connection block 8 ... Block Ekipan 11 ... Cylindrical protrusion 12 ... First arc groove 13 ... Inflow path 14 ... Outflow path 15 ... Communication part 16 ... Outlet passage 17 ... Communication passage 18 ... 1st introduction passage 19 ... Second introduction passage 23a, 23b ... Tank section 30 ... Second arc groove

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F28F 9/02 301

Claims (4)

(57) [Claims] 1. A flat tube and heat radiation fins are alternately laminated between two end plates, an inflow tank and an outflow tank are formed at an end of the flat tube, and an opening formed in the end plate is used. The heat exchange medium that has flowed into the inflow tank is made to flow in the flat tube and exchanges heat with the air passing through the outside through the radiating fins, and then through the other opening formed in the end plate from the outflow tank. In the heat exchanger to be discharged by joining, a part of the end plate is joined to the flat tube at a position other than the joining portion with the tank, a plate-shaped body is drawn, and integrated with the end plate. The heat exchange medium flowing in and out from one of the tanks through the opening flows at a part of the joining portion of the end plate other than the joining portion with the tank. A flow path plate having a predetermined flow path cross-sectional area suitable for the above, and heat attached to the flow path plate, joined to another opening of the end plate, and flowing into and out of the other tank. And a block having another flow path through which the exchange medium flows. 2. A groove part which 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 which forms the groove part is joined to the flat tube. The heat exchanger according to claim 1. 3. The end plate is characterized in that an opening joined to an opening of one tank is located inside the opening of the tank, and is constituted by a throttle portion capable of freely setting a flow passage cross-sectional area. The heat exchanger according to claim 1 or 2. 4. The flow path formed by the end plate and the flow path plate is formed on a concentric circle centered on an opening to which the block is joined. The heat exchanger according to claim 1.