JPH0531418Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a heat exchanger such as an oil cooler for a car cooler.

Prior art and its problems FIG. 5 shows a conventional oil cooler for a car cooler. In this oil cooler 100, a plurality of flat units 103 each consisting of a pair of upper and lower annular plates 101 and 102 are stacked in multiple stages on a base plate 104.
An oil passage forming space 105 is formed therein,
A cooling water passage forming space 106 is formed between adjacent flat units 103, and each flat unit 10
a core 108 in which a multi-entry type inner fin 107 is disposed within an oil passage forming space 105 in 3; and a cover 10 that covers the core 108.
9. Adjacent flat units 103
The oil passage forming spaces 105 communicate with each other via two communication holes 110 and 111 located symmetrically with respect to the center of the flat unit 103.
A pipe 112 passes through a hole in the center of the core 108.

Cooling water is led into the cover 109 from a water inlet 113 provided in the cover 109, passes through a cooling water passage forming space 106 between the flat units 103, and flows out from a water outlet 114. Oil sent from the engine side flows from the oil inlet 115 of the base plate 104 through one of the communication holes 110 into the oil passage forming space 105 in each flat unit 103, and then flows into the oil passage forming space 105 in each flat unit 103. 105 and the other communicating hole 11
1 and through the oil outflow hole 116 provided in the cover 109 to the oil filter 117,
After being filtered here, it is returned to the engine side through a pipe 112.

In the conventional oil cooler 100 described above, the oil passage forming space 105 in each flat unit 103 is
Since a multi-entry type inner fin 107 is disposed inside the oil pump, there is a problem in that the oil pressure loss due to the fin 107 is high and a large load is placed on the oil pump.

The purpose of this invention is to provide a heat exchanger that solves the above problems.

Means for Solving the Problems The heat exchanger according to this invention consists of a pair of upper and lower annular plates and flat units each having a space for forming a first fluid passage therein, which are stacked in multiple stages. A plurality of hollow downwardly projecting spacers are formed at least on the lower annular plate at intervals in the circumferential direction, and a space for forming a second fluid passage is formed between two adjacent flat units. An inner fin made of an annular plate having a plurality of upper protrusions and a plurality of lower protrusions facing the recess in the spacer of the lower annular plate is arranged in the first fluid passage forming space in each flat unit. It is characterized by being

Embodiment Hereinafter, an embodiment in which this invention is applied to an oil cooler will be described with reference to FIGS. 1 to 4. In the following description, left refers to the left side of FIG. 1, and right refers to the right side of FIG. 1, respectively.

The oil cooler 1 is made of aluminum, and includes a tank 2, a core 4 having a plurality of flat units 3 housed in the tank 2 and stacked in multiple stages.
The upper unit 5 is provided on the core 4. The tank 2 is mounted on a crankcase 6 via an annular base plate 7. The crankcase 6 has a vertical oil outflow hole 8 in the center and a vertical oil inflow hole 9 on one side thereof. Further, on the upper surface of the crankcase 6, an annular groove 10 is formed around the opening of the oil outflow hole 8 and communicates with the oil inflow hole 9.
The base plate 7 is arranged so that its center hole 7a matches the oil outflow hole 8 of the crankcase 6 and closes the opening of the annular groove 10 of the crankcase 6. The base plate 7 is provided with an oil introduction hole 7b that communicates with the annular groove 10 of the crankcase 6.

A bolt insertion hole 2a communicating with the center hole 7a of the base plate 7 and an oil introduction hole 2b communicating with the oil introduction hole 7b of the base plate 7 are bored in the bottom wall of the tank 2. The lower surface of the bottom wall of the tank 2 is joined to the upper surface of the base plate 7. A cooling water inlet 11 and a cooling water outlet 12 are provided on the peripheral wall of the tank 2 .

Each flat unit 3 has an annular upper plate 13
and an annular lower plate 14. A downwardly projecting annular hanging wall 13a is formed on the peripheral edge of the upper plate 13, and an outwardly projecting edge 13b is formed at the lower end of this hanging wall 13a. An annular rising wall 14a projecting upward is formed on the peripheral edge of the lower plate 14, and an outwardly projecting edge 14b is formed at the upper end of this rising wall 14a. Both plates 13 and 14 of each flat unit 3 have their outwardly protruding edges 13 and 14b overlapped with each other, and a first ring 15 having a substantially C shape and a partially cut out portion is interposed between the inner peripheral edges. It is joined.

Both plates 13 and 14 of each flat unit 3 are formed with a first outward bulging portion 17 extending rightward from the periphery of the center hole 16 and the right side thereof, and a circular shaped portion 17 is formed on the left side of the center hole 16. A second outward bulge 18 is formed. A first communication hole 19 is formed on the right side of the first outwardly bulging portion 17 of both plates 13 and 14 of each flat unit 3. Second communication holes 20 are formed in the second outwardly bulging portions 18 of all the plates 13 and 14 except for the lower plates 13 and 14 of the flat unit 3 at the lowest stage. Both plates 13 of each flat unit 3,
An annular inner protruding edge 21 is formed at the edge of the first communication hole 19 of 14, and an annular inner protruding edge 21 is formed on the outer surface of both inner protruding edges 21 so as to span both inner protruding edges 21 within each flat unit 3. A second ring 22 is fitted.

Where the first and second outwardly bulging portions 17 and 18 of both plates 13 and 14 of each flat unit 3 are not provided, a plurality of hollow holes are formed at intervals in the circumferential direction from the outside and inside of the outer peripheral edge. Outwardly protruding spacer 2
3 is formed. The protruding length of these spacers 23 is the same as that of the first and second outward bulges 17 and 18.
It is the same as the length of the bulge.

Among the spaces (first fluid passage forming spaces) in each flat unit 3, the space surrounded by the second ring 22 is the oil circulation outward path forming space 24, and the other spaces are for oil flow. This is a space 25 for forming a return path for circulation.

An inner fin 26 is arranged in the space 25 for forming an oil circulation return path in each flat unit 3. The inner fin 26 is made of an annular plate. The inner fin 26 has an oil distribution hole 2 at a position corresponding to the second communication hole 20 of the flat unit 3.
7 is open. The right side of the center hole 28 of the inner fin 26 is connected to the second communication hole 2 of the flat unit 3.
It extends to the position corresponding to 0.

In the areas of the inner fin 26 where the central hole 28 and the oil distribution hole 27 are not provided, a plurality of upper protrusions 29 and lower protrusions 30 are formed alternately at intervals in the circumferential direction from the inner circumferential edge, from the outer circumferential edge, and in between. has been done. Among the lower protrusions 30 formed between the inner periphery, the outer periphery, and the middle of the inner fin 26, the lower protrusion 30 is formed between the inner periphery and the outer periphery, and from the outer periphery.
They face the recesses in each spacer 23 of the lower plate 14 of the flat unit 3, respectively. A turbulent flow generating hole 31 is formed on the outer peripheral edge of the inner fin 26 at a position between the upper protrusion 29 and the lower protrusion 30. The inner fin 26 has an upper protrusion and a lower protrusion 30 formed on the upper plate 1 of the flat unit 3.
3 and the lower plate 14, thereby being fixed to the flat unit 3.

Adjacent flat units 3 include the first outward bulging part 17, the second outward bulging part 18 and the spacer 2 of the lower plate 14 in the upper flat unit 3.
3 is the first outward bulging part 17 and the second outward bulging part 1 of the upper plate 13 in the lower flat unit 3.
8 and spacer 23, respectively,
The first communicating holes 19 and the second communicating holes 20 are connected to each other. The space 24 for forming an outward oil flow path of each flat unit 3 is communicated with the first communication hole 19, and the space 24 for forming a return path for oil flow of each flat unit 3 is communicated with the second communication hole 20.
communicated via. In the core 4, the center hole 16 of the lower plate 14 of the lowest flat unit 3 matches the bolt insertion hole 2a of the tank 2, and the first communication hole 19 of the lower plate 14 matches the oil introduction hole 2b of the tank 2. It is housed in the tank 2 and connected to the tank 2 so as to be connected to the tank 2. Space between adjacent flat units 3, tank 2 and core 4
The space between is the cooling water passage forming space 32.
(Second fluid passage forming space).

The upper unit 5 includes an annular top plate 41 joined to the upper surface of the core 4 , a rhombic block 42 joined to the upper surface of the ring-shaped top plate 41 , a block opening closing plate 43 joined to the upper surface of the ring-shaped top plate 41 , and a top plate 4 connected to the upper surface of the ring-shaped top plate 41 .
1 and a cover 44 placed over the block 42.

The top plate 41 has an oil outflow hole 45 connected to the first communication hole 19 of the uppermost flat unit 3.
An oil inflow hole 46 connected to the second communication hole 40 is formed. The outer peripheral edge of the top plate 41 is joined to the inner peripheral surface of the tank 2.

The block 42 has an oil outflow hole 48 that communicates with the oil outflow hole 45 of the top plate 41, and an oil inflow/bolt insertion hole 49 that communicates with both the central hole 47 and the oil inflow hole 46 of the top plate 41. There is.

The block opening closing plate 43 has an oil outlet hole 50 communicating with the oil outlet hole 48 of the block 42 and a bolt insertion hole 51 corresponding to the center hole 47 of the top plate 41.

A bolt insertion hole 52 is formed in the center of the cover 44, and an oil outflow hole 53 is formed around the bolt insertion hole 52. An oil filter 60 is attached on top of this cover 44. The peripheral edge of the bolt insertion hole 52 on the lower surface of the cover 44 is joined to the peripheral edge of the bolt insertion hole 51 on the upper surface of the block opening closing plate 43.

The center hole of the core 4 has male threaded portions 61 at both ends.
A cooler tightening bolt 63 having a diameter of 62 passes through it. The upper part of the bolt 63 passes through the center hole 47 of the top plate 41, the oil inflow/bolt insertion hole 49 of the block 42, the bolt insertion hole 51 of the block opening closing plate 43, and the bolt insertion hole 52 of the cover 44, and extends above the cover 44. It stands out. At the lower position of the male threaded portion 61 on the upper side of the bolt 63,
A flange 64 is formed, and this flange 6
The lower surface of the cover 4 is in contact with the edge of the bolt insertion hole 52 on the upper surface of the cover 44. The lower end of the bolt 63 connects to the bolt insertion hole 2a of the tank 2 and the base plate 7.
The cooler 1 is screwed into the oil outflow hole 8 of the crankcase 6 through the central hole 7a of the cooler 1, thereby fixing the cooler 1 to the crankcase 6.

The periphery of the center hole 7a of the base plate 7, the periphery of the center hole 47 of the top plate 41, and the cover 4
The peripheries of the four bolt insertion holes 52 are joined to the outer circumferential surfaces of the bolts 63, respectively. And bolt 6
A sealed space 65 is formed between the bolt 63 and the first ring 15, and a sealed space 65 is formed between the bolt 63 and the peripheral wall of the oil inflow/bolt insertion hole 49 of the block 42.
6 is formed. The oil filter 60 is attached to the cooler 1 by being screwed into the male threaded portion 61 on the upper side of the bolt 63.

A vertical upper oil circulation hole 67 is formed in the upper part of the bolt 63 and is open on the upper surface of the bolt 63. A horizontal communication hole 68 that communicates the upper oil circulation hole 67 with the space 66 in the block 42 is bored in the peripheral wall of the upper oil circulation hole 67 of the bolt 63. In addition, the upper oil circulation hole 6 of the bolt 63
A vertical lower oil circulation hole 69 is provided below the bolt 63 and is opened on the lower surface of the bolt 63 . A space 65 between the bolt 63 and the first ring 15 is provided on the peripheral wall of the lower oil flow hole 69 of the bolt 63;
A plurality of communication holes 70 are formed to communicate with the lower oil circulation hole 69.

In the above configuration, the cooling water is led into the tank 2 from the cooling water inlet 11, passes through the cooling water passage forming space 32 in the tank 2, and is led out of the tank 2 from the cooling water outlet.

The oil sent from the engine side by the oil pump through the oil inlet hole 9 of the crankcase 6 passes through the annular groove 10, the oil inlet hole 7b of the base plate 7, and the oil inlet hole 2b of the tank 2, and enters the core 4. The oil is guided to a space 24 for forming an outward oil flow path. Space section 2 for forming oil flow path
4, the oil flows through this space 24, the oil outflow hole 45 of the top plate 41, and the block 42.
The cover 44 passes through the oil outflow hole 48 of the
The oil flows into the oil filter 60 through the oil outflow hole 53 of the cover 44. After the oil is filtered by the oil filter 60, the tightening bolt 6
The oil enters the space 66 in the block 42 through the upper oil distribution hole 67 and the communication hole 68 of the top plate 41, and passes through the oil inflow hole 46 of the top plate 41 and the second communication hole 20 to form an oil flow return path in the core 4. It is guided to the space section 25. The oil guided to the space 25 for forming an oil circulation return path travels halfway around this space 25 and flows from the cutout 15a of the first ring 15 to the space 65 between the tightening bolt 63 and the first ring 15.
The oil enters the crankcase 6 through the communication hole 70 and is guided to the lower oil circulation hole 69 of the tightening bolt 63.
The oil is sent to the engine side through the oil outflow hole 8.

Effects of the invention The heat exchanger according to this invention consists of a pair of upper and lower annular plates and flat units each having a space for forming a first fluid passage therein, which are stacked in multiple stages. A plurality of hollow downwardly protruding spacers are formed at least on the lower annular plate at intervals in the circumferential direction, and a second fluid passage forming space is formed between two adjacent flat units. An inner fin made of an annular plate having a plurality of upper protrusions and a plurality of lower protrusions facing the recess in the spacer of the lower annular plate is arranged in the first fluid passage forming space in the flat unit. . Since the inner fin is made of an annular plate, the pressure loss of the first fluid due to the inner fin is small, and the load on the second fluid pump is reduced. Furthermore, the structure of the inner fin is simple, and its manufacture is also simple.

Furthermore, since a plurality of hollow downwardly protruding spacers are formed on at least the lower annular plate of the upper annular plate and the lower annular plate of the flat unit, it is possible to easily create a second spacer between adjacent flat units. A space for forming a fluid passage can be formed.

In addition, since the inner fin has a plurality of downward protrusions facing the recess in the spacer of the lower annular plate, the inner fin has a plurality of downward protrusions that face the recess in the spacer of the lower annular plate. The flow of the first fluid is improved, and there is no chance that the first fluid will stagnate and stagnate in the recess in the spacer.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is a longitudinal sectional view of the oil cooler, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a sectional view of the oil cooler in Figure 1. −
4 is a sectional view taken along the line - in FIG. 3, and FIG. 5 is a longitudinal sectional view showing a conventional example. 1...Oil cooler, 3...Flat unit, 1
3... Upper plate, 14... Lower plate, 2
3... Spacer, 24... Space for forming an outward oil circulation path, 25... Space for forming a return path for oil circulation,
26...Inner fin, 29...Upper protrusion, 3
0...Downward protrusion, 32...Cooling water passage forming space.

Claims (1)

[Scope of utility model registration request] A flat unit consisting of a pair of upper and lower annular plates and having a first fluid passage forming space inside is stacked in multiple stages, and at least the lower annular plate of the upper annular plate and the lower annular plate has a A plurality of hollow downward protruding spacers are formed at intervals in the circumferential direction, a second fluid passage forming space is formed between two adjacent flat units, and a first fluid passage forming space in each flat unit is formed. A heat exchanger in which an inner fin made of an annular plate having a plurality of upper protrusions and a plurality of lower protrusions facing a recess in a space of a lower annular plate is disposed within the section.