JP2000292077A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger provided with tanks for collecting and distributing fluid at the opposite ends of a tube in which abnormal noise based on breakup or deformation of bubble is reduced. SOLUTION: A regulation pipe 17 extends from an inlet pipe 15 into a tank 13 and a passage 172 in the regulation pipe 17 communicates with the tank 13 through many holes 171 made in the regulation pipe 17. When fluid flows through the passage 172, it flows sequentially into the inlet tank 13 through the hole 171 and since the flow rate decreases gradually toward the forward end side of flow A, current velocity of fluid decreases gradually in the passage 172. Generation of sound wave is suppressed by making gentle the variation of current velocity thereby reducing breakup or deformation of bubble.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat of a fluid passing inside and outside a tube, and is suitable for, for example, a heater core and a refrigerant evaporator of a vehicle air conditioner.

[0002]

2. Description of the Related Art As shown in FIG. 16, a heater core (heat exchanger) of a conventional vehicle air conditioner has a large number of flat tubes 101 having a hot water passage therein arranged in parallel.
Corrugated outer fin 1 between adjacent tubes 101
In addition, an inlet tank 103 and an outlet tank 104 serving as hot water collecting portions are arranged on both sides of the tube 101.

[0003] Cooling water (hot water) of a vehicle engine (not shown) flows into the inlet tank 103 from the inlet pipe 105, and further reaches the outlet pipe 106 via the tube 101 and the outlet tank 104. Heat exchange is performed between warm water (fluid) flowing inside 101 and air-conditioning air (fluid) flowing outside tube 101.

[0004]

However, in the above-mentioned heater core, hot water flows from the inlet pipe 105 to the inlet tank 1.
At the time of inflow to 03, the flow velocity sharply decreases due to a sudden increase in the passage area. Further, when the hot water flows from the outlet tank 104 into the outlet pipe 106, the flow velocity sharply rises due to a sudden decrease in the passage area.

When the bubble 107 in the warm water undergoes a sudden change in pressure where the flow velocity changes abruptly, the bubble 107 is split or deformed to generate an impulse-like sound wave. Upon reaching 104, the tanks 103 and 104 are vibrated. Here, the tanks 103 and 104 are made of thin aluminum of about 1 mm for weight reduction and the like, and generally have many flat surfaces, and therefore have low rigidity, so that they can be easily vibrated. There is a problem that a radiated sound (abnormal sound) is generated by propagating to the whole.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to reduce abnormal noise due to bubble splitting and deformation in a heat exchanger having a tank for collecting and distributing fluid at both ends of a tube.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a tank (13) for collecting and distributing a fluid is provided at both ends of a plurality of tubes (11) through which a fluid flows. , 14) and tanks (13, 14)
In the heat exchanger in which the connecting portions (15, 16) for communicating the air and the external pipe are provided in the tanks (13, 14), the connecting portions (1
5, 16) are arranged along the direction of fluid flow in the flow rate adjusting pipes (17-19, 30) on cylindrical flow rate adjusting pipes (17-19, 30) extending into the tanks (13, 14). And a number of holes (17) communicating between the inside of the tanks (13, 14) and the flow rate control pipes (17-19, 30).
1, 181, 191 and 304).

According to this, for example, a flow rate adjusting pipe (18,
19, 30) on the outlet tank (14) side,
Fluid flows into the flow rate control tubes (18, 19, 30) sequentially through a number of holes (181, 191, 304) arranged along the fluid flow direction in the flow rate control tubes (18, 19, 30). Therefore, the flow rate of the fluid flowing in the flow rate control pipes (18, 19, 30) gradually increases toward the connection portion (16), and accordingly, the flow rate of the fluid in the flow rate control pipes (18, 19, 30) increases. The flow rate also increases gradually. On the other hand, the flow rate adjusting pipe (1
7, 30) on the inlet tank (13) side,
The flow velocity of the fluid in the flow velocity control pipes (17, 30) gradually decreases.

As described above, the flow rate adjusting pipes (17 to 19, 3
0) and the connections (15, 16) and the tanks (13, 1).
By slowing the change of the flow velocity of the fluid between the inside and the inside of 4), the splitting and deformation of bubbles in the fluid can be reduced, and the generation of impulse sound waves can be suppressed. Therefore, it is possible to reduce the vibration of the tanks (13, 14) due to the sound waves and the generation of the abnormal noise accompanying the vibration.

According to the second aspect of the present invention, a collection of fluids is provided at both ends of a number of tubes (11) through which the fluid flows.
Distributing tanks (13, 14) are provided.
3, 14) and the connecting portions (15, 1) for communicating with the external piping.
In the heat exchanger provided with 6) in the tanks (13, 14), a cylindrical flow rate adjusting pipe (20) extending from the connection portion (15, 16) to the inside of the tank (13, 14) is provided. The opening (201) at the end of the pipe (20) is characterized in that it is cut obliquely to the direction of fluid flow in the flow velocity adjusting pipe (20).

According to this, for example, the flow rate adjusting pipe (20)
Is arranged on the side of the outlet tank (14), since the opening (201) of the flow velocity adjusting pipe (20) is cut obliquely to the fluid flow direction, The fluid sequentially flows into the flow rate control pipe (20), and the flow rate of the fluid flowing in the flow rate control pipe (20) gradually increases toward the connection portion (16), and accordingly, the flow rate in the flow rate control pipe (20) increases. Also gradually increases.

Therefore, similarly to the first aspect of the present invention, the change in the flow velocity of the fluid is moderated by the flow velocity control pipe (20).
Vibration of the tanks (13, 14) due to sound waves and the occurrence of abnormal noise associated with the vibration can be reduced. Further, the structure of the flow rate adjusting pipe (20) is simple (the hole 171 of the invention of claim 1).
181 and 191 are unnecessary), and can be implemented at low cost.

According to the third aspect of the present invention, the flow rate adjusting pipe (30) is formed separately from the connecting portions (15, 16).
By inserting and fixing in the connecting portions (15, 16), the flow rate adjusting pipe (30) can be made of resin and molded by a mold, and can be implemented at low cost.

According to a fourth aspect of the present invention, the first positioning portion (303) abutting on the inner wall surface of the throttle portion (151, 161) of the connection portion (15, 16);
16), the end (15) on the tank (13, 14) side.
By providing the second positioning portion (305) engaging with the second flow passage (2, 162) on the flow speed control tube (30), the flow speed control tube (30) is easily and securely fixed in the connection portion (15, 16). can do.

According to the fifth aspect of the present invention, a plurality of tubes (11) having a fluid passage (111) are provided at both ends thereof.
In a heat exchanger including tanks (13, 14) for collecting and distributing fluids, a sound absorbing material (26) for absorbing the energy of acoustic waves generated inside the tanks (13, 14) is provided in the tanks (13, 14). Are arranged so as to cover the inner wall of the.

According to this, the energy of the sound wave generated by the splitting and deformation of the bubbles is absorbed (attenuated) by the sound absorbing material (26), and the vibration of the tanks (13, 14) by the sound wave can be suppressed. Therefore, the tank (13,
14) It is possible to reduce the vibration and the generation of the abnormal noise accompanying the vibration.

According to the present invention, the heat exchanger has tanks (13, 14) for collecting and distributing the fluid at both ends of the multiple tubes (11) having the fluid passage (111). In the above, sound insulating materials (21 to 24) for reflecting sound waves generated inside the tanks (13, 14)
It is characterized by being arranged so as to cover the inner wall of the tank (13, 14).

According to this, the sound wave generated by the division or deformation of the bubbles is reflected by the sound insulation material (21 to 24) before reaching the tank (13, 14), and the reflected sound wave is reflected by the tank (13, 14). Gradually attenuated within. Therefore, it is possible to reduce the vibration of the tanks (13, 14) due to the sound waves and the generation of the abnormal noise accompanying the vibration.

According to the seventh aspect of the present invention, the sound insulating material (2
3) is characterized by having a large number of projections (231) projecting toward the inside of the tanks (13, 14).

According to this, the sound wave collides with the projection (231) and is scattered and reflected in various directions, and the reflected waves interfere with each other or the reflected wave and the next arrived sound wave and are attenuated. Therefore, abnormal noise can be further reduced.

According to the invention described in claim 8, the sound insulation material (2
An elastic member (25) for reducing the transmission of vibration between the sound insulating material (24) and the tank (13, 14) is provided between 4) and the inner wall of the tank (13, 14). .

According to this, the vibration of the sound insulating material (24) excited by the sound wave is absorbed by the elastic deformation of the elastic member (25), and the tank (13,
Vibration transmission to 14) is prevented. Therefore, it is possible to reliably prevent the tanks (13, 14) from being vibrated by the sound waves, and it is possible to further reduce abnormal noise.

According to the ninth aspect of the present invention, the sound insulating material (2
The sound absorbing material (26) for absorbing the energy of the sound waves generated inside the tanks (13, 14) is provided on the inner surface side of 4).

According to this, the energy of the sound wave is absorbed by the sound absorbing material (26), and the sound wave passing through the sound absorbing material (26) is reflected by the sound insulating material (24), and is again returned to the sound absorbing material (26).
At which the energy of the sound waves is absorbed. Therefore, the vibration of the tanks (13, 14) by the sound waves can be greatly reduced, and the generation of abnormal noise can be greatly reduced.

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

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. (First Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention, in which the present invention is applied to a heater core (heating heat exchanger) 1 used in a hot water heating device of a vehicle air conditioner. An example is shown below.

In FIG. 1, an engine 2 is driven by a water pump 3 driven by a water-cooled engine 2 for running a vehicle.
Is circulated through the heater core 1 and the radiator 4. A water valve 5 for adjusting the amount of warm water flowing into the heater core 1 is provided in a warm water circuit for flowing warm water to the heater core 1. The heater core 1 exchanges heat between hot water and blast air to heat the blast air, and the radiator 4 exchanges heat with air to cool the engine cooling water.

2 and 3, the heater core 1 is
A number of flat tubes 11 having a hot water (fluid) passage 111 therein are arranged in parallel, and adjacent tubes 1
The corrugated outer fins 12 are joined between the tubes 1 to exchange heat between hot water flowing through the passage 111 in the tube 11 and air-conditioning air flowing outside the tube 11.

At one end of the tube 11 (below in FIG. 2),
A rectangular inlet tank 13 for distributing hot water to a number of tubes 11 is provided, and the other end of the tubes 11 (upper part in FIG. 2)
Is provided with a rectangular outlet tank 14 for collecting warm water from a large number of tubes 11.

On the side wall 131 at one end of the inlet tank 13,
A cylindrical inlet pipe (connecting portion) 15 to which a pipe (not shown) for leading hot water from the water valve 5 is connected is arranged, and the inlet pipe 15 is joined to the inlet tank 13 by a throttle section 151 having a reduced passage area. I have. On the other hand, on a side wall 141 at one end of the outlet tank 14, a cylindrical outlet pipe (connection portion) 1 to which a pipe (not shown) for guiding hot water to the water pump 3 is connected.
6 is arranged, and the outlet pipe 16 is joined to the outlet tank 14 by a throttle portion 161 having a reduced passage area.

Inside the inlet tank 13, a cylindrical inlet adjusting pipe (flow rate adjusting pipe) 17 integrated with the inlet pipe 15 is installed. Extending to the side wall 132 of In the inlet adjustment pipe 17, the longitudinal direction of the adjustment pipe 17 (left-right direction in FIG. 3)
A large number of holes 171 having a diameter of about 1 mm are formed over almost the entire area of the substrate. Flow passage 172 inside the inlet adjustment pipe 17
Has a constant passage area, and the flow passage 172 communicates with the inside of the inlet tank 13 through the hole 171.

A cylindrical outlet adjusting pipe (flow rate adjusting pipe) 18 integral with the outlet pipe 16 is installed inside the outlet tank 14, and the outlet adjusting pipe 18 is connected to a side wall 141 at one end of the outlet tank 14. It extends to the side wall 142 at the other end. The outlet adjustment pipe 18 has a hole 181 having a diameter of about 1 mm over almost the entire area in the longitudinal direction (the left-right direction in FIG. 3) of the adjustment pipe 18.
Are formed in large numbers. The flow passage 182 inside the outlet adjustment pipe 18 has a constant passage area, and the flow passage 182 communicates with the inside of the outlet tank 14 through the hole 181.

The parts constituting the heater core 1 are all made of aluminum, and a part of the parts is made of a clad material in which a brazing material layer is clad on an aluminum core material layer. They are integrally joined. The thickness of the component parts is about 0.
25 mm, the outer fin 12 is about 0.05 mm, the tanks 13 and 14 are about 1 mm, and the entrance and exit pipes 15 and 16 and the entrance and exit adjustment pipes 17 and 18 are about 1 mm.

Next, the operation of the heater core 1 having the above configuration will be described.

The cooling water (warm water) of the engine 2 circulated by the water pump 3 reaches the inlet pipe 15 of the heater core 1 via the water valve 5. In the heater core 1, hot water flows from the inlet pipe 15 to the flow path 17 of the inlet adjusting pipe 17.
2 and flows into the inlet tank 13 through the hole 171. The hot water flowing into the inlet tank 13 flows to the outlet tank 14 through a number of passages 111 in the tubes 11, and when passing through the tubes 11, exchanges heat with blast air passing outside the tubes 11 to blow the hot water. Heat the air.
The hot water that has flowed into the outlet tank 14 flows into the flow passage 182 through the hole 181 of the outlet adjustment pipe 18 and reaches the outlet pipe 16. Then, the water is returned from the outlet pipe 16 to the suction side of the water pump 3.

Next, the change in the flow rate of the hot water from the inlet pipe 15 to the inlet tank 13 will be described. The flow rate of the hot water becomes maximum at the narrowed portion 151 having the smallest passage area on the hot water inlet side. Then, the hot water flows into the flow passage 1 of the inlet adjustment pipe 17.
When the hot water flows through the flow passage 72, the hot water flows out into the inlet tank 13 sequentially through the holes 171 formed along the hot water flow A in the flow passage 172. The flow A gradually decreases toward the front end side (the left side in FIG. 3), and accordingly, the flow velocity of the hot water in the flow passage 172 also gradually decreases.

As described above, the inlet tank 1 is connected to the inlet pipe 15.
By gently reducing the flow rate of the hot water until reaching 3, the splitting and deformation of bubbles in the hot water can be reduced, and the generation of impulse sound waves can be suppressed. Therefore, it is possible to reduce the vibration of the inlet tank 13 due to the sound wave and the generation of the abnormal noise accompanying the vibration.

On the other hand, the change of the flow rate of the hot water from the outlet tank 14 to the outlet pipe 16 will be described. The hot water flow B in the outlet passage 182 of the outlet adjusting pipe 18 is formed through a large number of holes 181 formed along the hot water flow B. Since the hot water sequentially flows from the outlet tank 14 into the flow passage 182, the flow rate of the hot water flowing through the flow passage 182 gradually increases toward the front end side (the right side in FIG. 3) of the hot water flow B, and accordingly, the flow passage The flow rate of the hot water in 182 also gradually increases, and the flow rate of the hot water at the throttle unit 161 becomes maximum.

As described above, the outlet pipe 1
By gently increasing the flow rate of the hot water up to 6, the splitting and deformation of bubbles in the hot water can be reduced, and the generation of impulse sound waves can be suppressed. Therefore, it is possible to reduce the vibration of the outlet tank 14 due to the sound wave and the generation of the abnormal noise accompanying the vibration.

Here, the size and number of the holes 171 and 181
By appropriately changing the arrangement and the like, the flow paths 172, 18
2 can be set to desired characteristics.

In the above embodiment, the inlet tank 13
The adjusting pipes 17 and 18 are provided in both the outlet tank 14 and the outlet tank 14. However, since there is a difference in how abnormal noise is generated depending on the shape and volume of the tank and other conditions, the necessity of the inlet tank 13 and the outlet tank 14 Adjustment tube 17 only for the higher one,
18 may be provided.

The inlet tank 13 and the outlet tank 1
4, when the vertical dimension in FIG. 3 is small, the adjusting tubes 17 and 18 may be formed in a flat shape that is thin in the vertical direction in FIG. 3 and wide in the direction perpendicular to the paper of FIG. (Second Embodiment) Next, a second embodiment shown in FIG. 4 will be described. In the first embodiment described above, the adjusting tubes 17 and 1
While the length of the tank 8 and the tanks 13 and 14 are substantially the same, the adjusting pipe 19 is shortened in the present embodiment.

The adjusting pipe 19 is formed integrally with the outlet pipe 16, and the length of the adjusting pipe 19 is set to about 50 mm while the length of the outlet tank 14 is set to about 250 mm. A plurality of holes 191 having a diameter of about 8 mm are formed in the adjustment pipe 19, and the holes 191 are formed in the flow passages 192 inside the adjustment pipe 19.
Are formed in two rows along the flow of warm water flowing through. The hole 191 connects the flow passage 192 to the inside of the outlet tank 14, and the opening 193 at the tip of the adjusting pipe 19 also connects the flow passage 192 to the inside of the outlet tank 14.

A description will be given of a change in the flow rate of hot water from the outlet tank 14 to the outlet pipe 16 in the above configuration.
First, part of the warm water flowing into the outlet tank 14 is
3 flows into the flow passage 192 and flows toward the outlet pipe 16.
Since the hot water flowing in from 1 merges sequentially, the flow path 192
The flow rate of the hot water flowing in the inside gradually increases from the opening 193 toward the outlet pipe 16, and accordingly, the flow rate of the hot water in the flow passage 192 gradually increases, and the flow rate of the hot water in the throttle portion 161 becomes maximum.

Therefore, also in the present embodiment, similar to the first embodiment, breakage and deformation of bubbles can be reduced, and abnormal noise can be reduced. Also, compared to the first embodiment,
Since the adjusting tube 19 is short, it is advantageous in terms of assembly.

In this embodiment, the adjusting pipe 19 is provided only in the outlet tank 14, but the adjusting pipe 19 is provided in the inlet tank 1 only.
3 may be provided, or may be provided in both the inlet tank 13 and the outlet tank 14. Further, the adjusting pipe 19
May have a cylindrical shape or a flat shape that is thin in the vertical direction in FIG. 4 and that is wide in the direction perpendicular to the plane of FIG. Also,
The hole 191 is formed along the hot water flow flowing through the flow passage 192 for three times.
You may form more than a line. (Third Embodiment) Next, a third embodiment shown in FIG. 5 will be described. In each of the above embodiments, the adjusting pipes 17, 1
8 and 19, holes 171, 181 and 191 are formed to adjust the flow rate of hot water.
The opening 201 at the end of the zero is cut obliquely so that the flow rate of hot water can be adjusted.

The adjusting pipe 20 is formed integrally with the outlet pipe 16. The length of the adjusting pipe 20 is about 50 mm while the length of the outlet tank 14 is about 250 mm. Further, the tip of the adjustment tube 20 is cut obliquely to the longitudinal direction of the adjustment tube 20 so that the opening 201 is elongated, and the opening 201 is opened toward the tube 11 side. Reference numeral 202 denotes a flow passage formed inside the adjustment pipe 20.

A description will be given of a change in the flow rate of hot water from the outlet tank 14 to the outlet pipe 16 in the above configuration.
First, part of the warm water flowing into the outlet tank 14
1 flows into the flow passage 202 and flows toward the outlet pipe 16 as a hot water flow B. Here, since the opening 201 has a shape elongated in the direction of the hot water flow B, the hot water sequentially merges with the hot water flow B from the opening 201, and the flow rate of the hot water flowing in the flow passage 202 gradually increases toward the outlet pipe 16. As a result, the flow velocity of the hot water in the flow passage 202 gradually increases, and the flow velocity of the hot water in the throttle portion 161 becomes maximum.

Therefore, also in the present embodiment, as in the first embodiment, breakage and deformation of bubbles can be reduced to reduce abnormal noise. In addition, the structure of the adjusting tube 20 is simple, and the holes 171 and 181, as in the first and second embodiments, are provided.
The processing of Step 191 is unnecessary, and can be performed at low cost.

In the present embodiment, the adjusting pipe 20 is provided only in the outlet tank 14, but the adjusting pipe 20 is connected to the inlet tank 1.
3 may be provided, or may be provided in both the inlet tank 13 and the outlet tank 14. Further, the adjusting pipe 20
May have a cylindrical shape, or may have a flat shape that is thin in the vertical direction in FIG. 5 and wide in the direction perpendicular to the plane of FIG. Also,
The opening 201 was opened toward the tube 11 side,
The same effect can be obtained even if the direction of the opening 201 is upward in FIG. 5 or perpendicular to the paper surface of FIG. (Fourth Embodiment) Next, a fourth embodiment shown in FIGS. In each of the above embodiments, the adjustment pipes 17 to
20 is formed integrally with the inlet pipe 15 and the outlet pipe 16, whereas in the present embodiment, the adjusting pipe 30 is formed separately.

As shown in FIG. 6, the inlet pipe 1 of this embodiment
The tank side cylindrical portions 152 and 162 of the 5 and the outlet pipe 16 are fitted into the mounting holes of the side walls 131 and 141 of the tanks 13 and 14, and are joined to the tanks 13 and 14 by brazing or the like.

As shown in FIGS. 6 to 9, the adjusting pipe (flow rate adjusting pipe) 30 has a tubular portion 301 having a flat cross section, and a bottom portion 302 is formed at one end of the tubular portion 301. A substantially conical enlarged portion (positioning portion) 303 is formed at the other end of the. A large number of holes 304 having a diameter of about 1 to 2 mm are formed in the cylindrical portion 301 and the bottom portion 302 to communicate between the inside of the tank and the inside of the cylindrical portion 301. The cylindrical portion 30
7, the tank-side tubular portions 152, 16 of the inlet pipe 15 and the outlet pipe 16 are provided at four locations, up, down, left, and right in FIG.
A protrusion (positioning portion) 305 that engages with the end of the second member 2 is formed. Here, the protrusion 305 is easily deformed when a force is applied from the outside to the inside, and returns to the original position when no external force is applied.

The adjusting tube 30 is made of a resin having high heat resistance, water resistance and flexibility. The cross-sectional shape of the cylindrical portion 301 is determined by the tank-side cylindrical portion 15 of the inlet pipe 15 and the outlet pipe 16.
2, 162, and their dimensions are such that the adjusting pipe 30 can be assembled into the inlet pipe 15 and the outlet pipe 16, and the cylindrical portion 301 and the tank-side cylindrical portion 152, 1
62 is set so as to be as small as possible.

The adjusting pipe 30 is inserted from the ends of the inlet pipe 15 and the outlet pipe 16 (right side in FIG. 6),
Is pushed until it comes into contact with the inner wall surfaces of the throttle portions 151, 161.
Is adapted to be engaged with the end portion. Thereby, the adjusting pipe 30 is positioned and fixed with respect to the inlet pipe 15 and the outlet pipe 16, and the cylindrical portion 301 and the bottom 302 project from the inlet pipe 15 and the outlet pipe 16 into the tanks 13 and 14. I have.

According to the present embodiment, the hot water from the inlet pipe 15 is supplied to the inlet tank 13 through the plurality of holes 304.
From the inlet pipe 15 to the inlet tank 13
, The flow rate of the hot water can be gradually reduced. On the other hand, the hot water in the outlet tank 14 flows into the adjusting pipe 30 sequentially through the holes 304 formed in a large number, so that the flow rate of the hot water flowing in the adjusting pipe 30 becomes closer to the front end of the hot water flow B (the right side in FIG. 6). It gradually increases, and the flow rate of warm water from the outlet tank 14 to the outlet pipe 16 can be gradually increased. Therefore, also in the present embodiment, similar to the first embodiment, the splitting and deformation of the bubbles can be reduced, and the abnormal noise can be reduced.

FIG. 10 shows a cylindrical portion 301 in this embodiment.
3 shows the result of comparing sound pressure levels by setting three types of length L. The dimensions of the main part of the heat exchanger used in this test are as follows: the protruding length L1 of the tank side tubular parts 152, 162 is 2 mm, and the internal length L2 of the tanks 13, 14 is 2
50 mm, width B of the cylindrical portion 301 of the adjustment tube 30 is 16.3 m
m, the height H of the cylindrical portion 301 is 7.7 mm, and the diameter d of the hole 304 of the cylindrical portion 301 is 1 mm.

In FIG. 10, the solid line a indicates the cylindrical portion 3.
01 has a length L of 14 mm, a dashed line b has L = 45 mm,
The two-dot chain line c shows the characteristics when L = 248 mm, and the broken line d shows the characteristics of the conventional heat exchanger without the adjusting tube 30. As is clear from FIG. 10, the sound pressure level can be reduced by installing the adjustment pipe 30,
As the length L of the cylindrical portion 301 is increased, the sound pressure level is significantly reduced.

Incidentally, since the inlet pipe 15 and the outlet pipe 16 are connected to external pipes, they must be made of metal from the viewpoint of strength, and the adjusting pipes 17 to 20 are connected to the inlet pipe 15 as in the above-described embodiment. When it is formed integrally with the outlet pipe 16, the cutting process of the adjusting pipe increases, and the cost tends to increase. On the other hand, by forming the adjusting pipe 30 separately from the inlet pipe 15 and the outlet pipe 16 as in the present embodiment, the adjusting pipe 30 is formed.
Can be made of resin and molded by a mold, and can be implemented at low cost.

It is to be noted that the number of holes 304 in the cylindrical portion 301 is defined as n, and the opening area of the hole 304 in the cylindrical portion 301 is defined as A, where nA> the passage area of the throttle portions 151 and 161. An increase in pipe pressure loss can be avoided.

The adjusting tube 30 may be made of metal. Furthermore, the adjustment pipe 30 may be provided only in the more necessary one of the inlet tank 13 and the outlet tank 14. Further, the adjusting pipes 17 to 20 of the first to third embodiments may be formed separately from the inlet pipe 15 and the outlet pipe 16 as in the present embodiment. (Fifth Embodiment) Next, a fifth embodiment shown in FIGS. In each of the above embodiments, the adjusting tube 1
By reducing the splitting and deformation of bubbles in warm water by 7 to 20, 30 to suppress the generation of impulse-like sound waves and reduce abnormal noise, in the present embodiment,
The sound insulating materials 21 and 22 that reflect the sound waves suppress the sound waves from reaching the tanks 13 and 14 and reduce abnormal sounds.

The sound insulating members 21 and 22 are made of a relatively soft rubber (for example, silicon rubber) having a high acoustic wave reflectance and a high heat and water resistance. The tank 13 is arranged so as to cover the inner wall of the bottom surface 133 and the inner walls of both side surfaces 134 and 135 extending in the longitudinal direction of the tank 13. On the other hand, the sound insulating material 22 in the outlet tank 14 is also formed in a U-shaped cross section,
It is arranged so as to cover the inner wall of the upper surface 143 and the inner walls of both side surfaces 144 and 145 extending in the longitudinal direction of the tank 14.

A method of manufacturing the heater core will be briefly described. First, the plate 13 which constitutes a part of the tank
6, 146, the tube 11, and the fin 12 are integrally brazed. On the other hand, each of the tanks 13, 14 and the entrance / exit pipes 15, 1
The sound insulating members 21 and 22 are fixed to the brazed member 6 by bonding or positioning means (not shown). Then, with the O-rings 137 and 147 interposed, the plate 1
36, 146 and each of the tanks 13, 14 are integrated by squeezing.

In the above configuration, when the hot water flows from the inlet pipe 15 into the inlet tank 13 and when the hot water flows from the outlet tank 14 into the outlet pipe 16, the flow velocity changes suddenly and bubbles 107 in the hot water rapidly change. By receiving a large pressure change, the bubble 107 is split or deformed, and an impulse-like sound wave is generated.

However, the sound waves are reflected by the sound insulating materials 21 and 22 before reaching the tanks 13 and 14, and the reflected sound waves are gradually attenuated in the tanks 13 and 14. Therefore, it is possible to prevent the tanks 13 and 14 from being vibrated by sound waves, and to reduce abnormal noise. (Sixth Embodiment) Next, a sixth embodiment shown in FIG. 13 will be described. In this embodiment, the projection 231 is provided on the sound insulating material 23.
Is different from the above-described fifth embodiment. The protrusion 231 has a cylindrical shape with a diameter of 1.5 mm and a height of 2 mm.
The protrusion 23 extends toward the inside of the inlet tank 13.
A large number are provided over the entire inner surface of the sound insulating material 23 at a pitch of 2.5 mm between them. According to the above configuration, similarly to the fifth embodiment, the sound wave is applied to the sound insulating material 2 before reaching the inlet tank 13.
3, the entrance tank 1 by sound waves
3 can be suppressed from being excited.

Further, in the present embodiment, the sound wave collides with the projection 231 and is scattered and reflected in various directions, and the reflected waves interfere with each other or the reflected wave and the next arrived sound wave and are attenuated. Therefore, abnormal noise can be further reduced. Note that the shape of the projection 231 may be other than a column, for example, a prism. Further, the sound insulating material 23 may be provided only in the inlet tank 13, or may be provided in the inlet tank 13 and the outlet tank 14.
May be provided in both. (Seventh Embodiment) Next, a seventh embodiment shown in FIG. 14 will be described. In this embodiment, the sound insulating material 24 is made of a high-density resin (for example, nylon 66) or metal (for example, lead) in order to enhance the sound insulating effect. This is different from the fifth embodiment in that the elastic member 25 is provided.

The elastic member 25 is made of, for example, metal cotton or soft rubber, which can be easily deformed and returned to the original shape, made of thin metal fibers. Are joined. The elastic member 25 extends in the longitudinal direction of the inlet tank 13, and two elastic members 25 are provided on the bottom surface 133 side of the inlet tank 13, and one elastic member 25 is provided on each of the side surfaces 134 and 135 of the tank 13.

In the above configuration, sound waves generated by the division or deformation of bubbles are reflected by the sound insulating material 24 before reaching the inlet tank 13, and the reflected sound waves are gradually attenuated in the inlet tank 13. At this time, the sound insulating material 24 is vibrated by the sound wave.
5 by the elastic deformation of the sound insulating material 2
The transmission of vibrations from the nozzle 4 to the inlet tank 13 is prevented, so that the inlet tank 13 can be reliably prevented from being vibrated by sound waves, and the noise caused by the division and deformation of the bubbles can be further reduced.

The sound insulating material 24 and the elastic member 25 are
It may be provided only in the inlet tank 13 or the inlet tank 13
And the outlet tank 14 may be provided. (Eighth Embodiment) Next, an eighth embodiment shown in FIG. 15 will be described. This embodiment is different from the above-described seventh embodiment in that a sound absorbing material 26 that converts sound energy into heat energy and absorbs sound is provided. The sound absorbing material 26 is made of foamed rubber or foamed resin having open cells, and is bonded to the inner surface side of the resin or metal sound insulating material 24 by bonding or the like.

In the above configuration, the sound wave generated by the division or deformation of the bubble first collides with the sound absorbing material 26. Then, the sound waves enter the open cells of the sound absorbing material 26, and the sound energy is converted into heat energy by vibration or friction of the fibers of the sound absorbing material 26, whereby the sound energy is absorbed. A part of the sound wave that has passed through the sound absorbing material 26 is reflected by the sound insulating material 24, and the sound absorbing material 26 absorbs the energy of the sound wave again. Accordingly, it is possible to prevent the inlet tank 13 from being vibrated by the sound waves.

Further, the light sound absorbing material 26 is vibrated by sound waves, but the vibration of the sound absorbing material 26 is reduced by the heavy sound insulating material 24, and the transmission of vibration to the inlet tank 13 is prevented by the elastic member 25. In addition, it is possible to more reliably prevent the inlet tank 13 from being vibrated by sound waves, and to further reduce abnormal noise due to the division and deformation of bubbles.

The sound insulating material 24, the elastic member 25 and the sound absorbing material 26 may be provided only in the inlet tank 13, or may be provided in both the inlet tank 13 and the outlet tank 14.

It is also possible to omit the sound insulating material 24 and the elastic member 25 and to prevent the generation of abnormal noise by using only the sound absorbing material 26. In that case, the sound absorbing material 26 is adhered to the tanks 13 and 14 or fixed by an appropriate positioning means. (Other Embodiments) The present invention is applicable not only to the above-described heater core but also to various heat exchangers such as a refrigerant evaporator of a vehicle air conditioner.

In the above embodiment, a one-way flow type heater core in which hot water flows in only one direction in all the tubes 11 is shown. However, two sets of cores are arranged in parallel, and The present invention is also applicable to a heater core of a type in which warm water that has passed through a tube makes a U-turn and flows into the tube of the other core portion.

Further, the above embodiments are combined and implemented by one heat exchanger (for example, the first tank is installed in the inlet tank).
It is also possible to provide the adjusting tube of the embodiment and provide the outlet tank with the adjusting tube of the second embodiment).

In the fifth to seventh embodiments, the sound insulators 21 to 24 for reflecting sound waves are used. Instead of the sound insulators 21 to 24, sound energy is converted into heat energy to convert the sound energy into heat energy. Sound absorbing material that absorbs
4 may be used in the same shape and arrangement.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioner to which a heat exchanger according to a first embodiment of the present invention is applied.

FIG. 2 is a perspective view showing a specific structure of the heater core of FIG.

FIG. 3 is a sectional view of the heater core of FIG. 2;

FIG. 4 is a sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a third embodiment of the present invention.

FIG. 6 is a sectional view of a heater core according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of the adjustment tube of FIG. 6;

FIG. 8 is a front view of the adjusting pipe of FIG. 6;

FIG. 9 is a side view of the adjustment pipe of FIG. 6;

FIG. 10 is a characteristic diagram showing sound pressure levels of the heater core of FIG. 6 and a conventional heater core.

FIG. 11 is a sectional view of a heater core according to a fifth embodiment of the present invention.

FIG. 12 is an enlarged sectional view taken along the line CC of FIG. 11;

FIG. 13 is a sectional view of a main part showing a sixth embodiment of the present invention.

FIG. 14 is a sectional view of a main part showing a seventh embodiment of the present invention.

FIG. 15 is a sectional view of a main part showing an eighth embodiment of the present invention.

FIG. 16 is a sectional view of a conventional heater core.

[Explanation of symbols]

11 ... tube, 13, 14 ... tank, 15, 16 ... connection part, 17-20, 30 ... flow rate adjusting pipe, 21-24 ... sound insulation material, 25 ... elastic member, 26 ... sound absorption material, 171,18
1, 191, 304 ... holes, 201 ... openings, 231 ... projections.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Nobuaki Ando 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Prefecture Inside Japan Automotive Parts Research Institute Co., Ltd. (72) Takuji Taki 1-1-1, Showacho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Mitsuru Kizen 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Inside Denso Corporation (72) Inventor Tomomi Nagayoshi 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Inside Denso Corporation F term (reference) 3L065 DA12 DA13 3L103 AA29 BB38 CC18 DD08 DD17 DD34 DD43

Claims (9)

[Claims] A plurality of tubes (1) through which a fluid flows.
1), tanks (13, 14) for collecting and distributing the fluid at both ends of the tube (11), and external piping provided in the tanks (13, 14) and leading the fluid are connected. A heat exchanger for exchanging heat between the fluid and an external fluid passing through the outside of the tube (11), comprising a connecting portion (15, 16) for communicating the tank (13, 14) with the external pipe; In the above, the connection portion (15, 16) is connected to the tank (13, 1).
4) A cylindrical flow rate adjusting tube (17 to 19, 3
0), and the flow rate adjusting pipes (17 to 19, 30) are arranged along the fluid flow direction in the flow rate adjusting pipes (17 to 19, 30), and are provided inside the tanks (13, 14). A heat exchanger, wherein a number of holes (171, 181, 191 and 304) are formed to communicate between the inside of the flow rate adjusting pipes (17 to 19 and 30). 2. A number of tubes (1) through which a fluid flows.
1), tanks (13, 14) for collecting and distributing the fluid at both ends of the tube (11), and external piping provided in the tanks (13, 14) and leading the fluid are connected. A heat exchanger for exchanging heat between the fluid and an external fluid passing through the outside of the tube (11), comprising a connecting portion (15, 16) for communicating the tank (13, 14) with the external pipe; In the above, the connection portion (15, 16) is connected to the tank (13, 1).
4) a cylindrical flow rate adjusting pipe (20) extending inside;
A heat exchanger characterized in that an opening (201) at an end of the flow rate adjusting pipe (20) is cut obliquely to a fluid flow direction in the flow rate adjusting pipe (20). 3. The flow rate adjusting pipe (30) is formed separately from the connecting portions (15, 16), and is connected to the connecting portions (15, 16).
The heat exchanger according to claim 1, wherein the heat exchanger is inserted into and fixed to the heat exchanger. 4. The connection part (15, 16) has a throttle part (151, 161) whose passage area decreases from the external pipe toward the tank (13, 14), and the flow rate adjusting pipe (15, 161). 30) is the throttle section (151, 16).
1) a first positioning portion (303) abutting on the inner wall surface;
The tank (13, 13) at the connection portion (15, 16)
A second positioning portion (305) engaging with the end (152, 162) on the side of the (14) side.
A heat exchanger according to item 1. 5. A number of tubes (1) through which a fluid flows.
1) and tanks (13, 14) for collecting and distributing the fluid at both ends of the tube (11), and perform heat exchange between the fluid and an external fluid passing outside the tube (11). In the heat exchanger, the sound absorbing material (26) for absorbing the energy of the sound wave generated inside the tank (13, 14) is provided in the tank (1).
3. A heat exchanger, wherein the heat exchanger is arranged so as to cover an inner wall of the heat exchanger. 6. A number of tubes (1) through which a fluid flows.
1) and tanks (13, 14) for collecting and distributing the fluid at both ends of the tube (11), and perform heat exchange between the fluid and an external fluid passing outside the tube (11). In the heat exchanger to be performed, sound insulating materials (21 to 24) for reflecting sound waves generated inside the tanks (13, 14) are provided in the tanks (13, 1).
4) The heat exchanger, wherein the heat exchanger is arranged so as to cover the inner wall. 7. The tank (1), wherein the sound insulating material (23) is provided.
3 and 14), a large number of projections (2
31. The heat exchanger according to claim 6, comprising: 8. The sound insulation material (24) and the tank (1).
7. An elastic member (25) for reducing the transmission of vibration between the sound insulating material (24) and the tank (13, 14) is provided between the inner wall of the tank and the inner wall of the tank. Or the heat exchanger according to 7. 9. A sound absorbing material (26) for absorbing energy of a sound wave generated inside the tank (13, 14) is provided on an inner surface side of the sound insulating material (24). Or the heat exchanger according to 8.