JP2003254639A - Evaporator and refrigerating cycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent generation of noises, by structure of an evaporator itself, in the evaporator associated with flowing of refrigerant in a refrigerant cycle such as a car air conditioner without using an additional silencer. <P>SOLUTION: The evaporator 1 comprises an evaporator core 2 having a refrigerant inlet 2A and a refrigerant outlet 2B on one side and a communication member 3 connected with one side of the evaporator core 2 internally having a refrigerant guide passage 3A and a refrigerant discharge passage 3B. The communication member 3 is formed by a first plate 31 and a second plate 32. The second plate 32 has a recessed part 32A for forming the refrigerant guide passage and a recessed part 32B for forming the refrigerant discharge passage with a refrigerant guide tube connection port 321 and a refrigerant discharge tube connection port 322 on bottom walls of the recessed parts. A protrusion 310A for straightening refrigerant protruding toward the refrigerant guide tube connection port 321 is formed on outside face of the first plate 31. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator used as an evaporator for a car air conditioner, and a refrigeration cycle for a car air conditioner equipped with the evaporator.

[0002]

2. Description of the Related Art In a refrigeration cycle such as a car air conditioner, noise such as "shoes" or "hues" accompanying the flow of refrigerant is mainly generated in a condenser or an expansion valve. However, in some cases, the above noise is generated in the evaporator depending on the conditions under which the refrigerant flows. Particularly in the case of a car air conditioner, if noise is generated in the evaporator arranged relatively close to the passenger compartment, passengers may feel uncomfortable.

As a means for solving the above noise problem, a refrigerant distributor having a sound absorbing material is disposed on the upstream side of the evaporator (see JP-A-10-185363).
Alternatively, a silencer is arranged on the upstream side of the evaporator (Japanese Patent Laid-Open No. HEI-1
1-325655) and the like have been proposed.

[0004]

However, these means use a sound absorbing material and a silencer in addition to the components of a normal refrigeration cycle, resulting in an increase in cost and an extra installation space. May be required.

An object of the present invention is to effectively generate noise in the evaporator due to the flow of the refrigerant in the refrigeration cycle of a car air conditioner or the like by the structure of the evaporator itself without using a silencer or the like. To prevent it.

[0006]

Means for Solving the Problems and Effects of the Invention An evaporator according to the present invention includes an evaporator core having a refrigerant inlet and a refrigerant outlet at one side, and an evaporator core joined to the one side. A communication member having therein a refrigerant introduction path that connects the refrigerant inlet and the refrigerant introduction pipe and a refrigerant discharge path that connects the refrigerant outlet and the refrigerant discharge pipe are provided. The communication member has an inlet-side communication hole and an outlet-side communication hole, and a first plate joined to one side of the evaporator core so that these communication holes communicate with the refrigerant inlet and the refrigerant outlet; A second plate having a passage-forming recess and a refrigerant discharge passage-forming recess and joined to the outer surface of the first plate so that one end of these recesses faces the inlet-side communication hole and the outlet-side communication hole; Consists of. A coolant introducing pipe connecting hole is provided on the bottom wall of the other end of the coolant introducing passage forming recess, and a coolant discharge pipe connecting hole is provided on the other end bottom wall of the coolant discharging passage forming recess. The refrigerant introduction pipe and the refrigerant discharge pipe are connected via a pipe connecting member joined to the outer surface of the plate. Then, on the outer surface of the first plate, there is formed a refrigerant rectifying protrusion protruding toward the refrigerant introduction pipe connection hole of the second plate.

The gas-liquid two-phase state refrigerant decompressed by the expansion valve flows through the refrigerant introducing pipe and the pipe connecting member into the refrigerant introducing passage of the connecting member of the evaporator from the refrigerant introducing pipe connecting hole.
The refrigerant that has flowed in collides with the outer surface of the first plate that faces the refrigerant introduction pipe connection hole, changes its direction substantially at a right angle, flows through the refrigerant introduction passage, and then flows into the evaporator core from the refrigerant inlet. Here, if the outer surface of the second plate facing the refrigerant introduction pipe connection hole is flat, the resistance when the flowing-in refrigerant changes the direction of the flow increases, and the flow becomes turbulent. It is considered to be a factor that causes noise during the operation of the refrigeration cycle of a car air conditioner or the like. Therefore, as described above, if the refrigerant rectifying projections protruding toward the refrigerant introduction pipe connection hole of the second plate are formed on the outer surface of the first plate, the refrigerant flowing into the refrigerant introduction passage is By flowing along the surface of the protrusion, the direction of the flow changes smoothly, and turbulence is less likely to occur. Therefore, according to the evaporator of the present invention, generation of noise due to the inflow of the refrigerant is prevented.

In the evaporator according to the present invention, it is preferable that the center of the refrigerant rectifying protrusion is aligned with the center of the refrigerant introducing pipe connecting hole.

If the projections for rectifying the refrigerant are arranged as described above, the refrigerant rectifying effect by the projections is further enhanced in the refrigerant introducing portion, and the generation of noise is surely prevented.

Further, in the evaporator according to the present invention, instead of or in addition to the protrusion provided in the refrigerant introduction portion, the evaporator protrudes toward the refrigerant discharge pipe connection hole on the outer surface of the first plate. The refrigerant rectification protrusion may be formed.

As described above, the noise accompanying the circulation of the refrigerant in the evaporator is generally apt to occur in the refrigerant introduction portion. However, depending on the conditions under which the refrigerant flows, turbulence may occur in the refrigerant flow at the refrigerant discharge portion, causing noise. Therefore, as described above, the first
If a refrigerant rectifying protrusion protruding toward the refrigerant discharge pipe connection hole is formed on the outer surface of the plate, the refrigerant flowing through the refrigerant discharge passage smoothly flows by flowing along the surface of the protrusion. In addition to the direction of flow changing to the refrigerant discharge pipe connection hole, turbulence is less likely to occur. This prevents the generation of noise due to the outflow of the refrigerant.

Also in this evaporator, it is preferable that the center of the refrigerant rectifying projection is aligned with the center of the refrigerant discharge pipe connecting hole.

If the projections for rectifying the refrigerant are arranged as described above, the refrigerant rectifying effect by the projections is further enhanced in the refrigerant discharge portion, and the generation of noise is surely prevented.

In the evaporator according to the present invention, the shape of the refrigerant rectifying projection is not particularly limited as long as it can prevent unrectification of the refrigerant flowing into the refrigerant introducing passage or the refrigerant flowing out of the refrigerant discharging passage. , For example, approximately conical,
It has a substantially truncated cone shape or a substantially hemispherical shape.

When the projection for rectifying the refrigerant has a substantially conical shape, a substantially truncated cone shape, or a substantially hemispherical shape, the refrigerant can smoothly change its direction by flowing along the surface of the projection, and also causes turbulence. It will be difficult.

In the evaporator according to the present invention, the structure of the evaporator core is not particularly limited as long as the refrigerant inlet and the refrigerant outlet are provided on one side of the evaporator core. . That is, the evaporator core is 2
One horizontal header and a plurality of vertical heat exchange pipes which are arranged at intervals in the left-right direction and whose both ends are connected to the upper and lower headers, and the refrigerant inlet is provided at one of the one ends of the upper and lower headers. The refrigerant outlet may be provided on the other side.

The evaporator core described above comprises a large number of core plates each having a recess for upper and lower headers and a recess for heat exchange tube formation, both ends of which are continuous with the recesses for upper and lower headers and shallower than these recesses. There is a case where the core plates are so-called laminated type in which the concave portions are joined to each other so that the concave portions face each other.

Next, a refrigeration cycle according to the present invention comprises the above-mentioned evaporator according to the present invention.

According to the above refrigeration cycle, the generation of noise accompanying the circulation of the refrigerant in the evaporator is prevented by the cold flow rectifying protrusion provided in the evaporator itself. Therefore, unlike the prior art, it is not necessary to install a special device on the upstream side of the evaporator, so that quiet operation can be realized without requiring extra cost and installation space, which is particularly advantageous for car air conditioners. Can be applied.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described with reference to FIGS. In the following description, the upper, lower, left and right sides of FIG. 1 are referred to as “upper, lower, left and right”, the upper portion of FIG. 2 is referred to as “front”, and the lower portion of FIG. 2 is referred to as “rear”.

In this embodiment, the present invention is applied to a laminated evaporator for a car air conditioner. As shown in FIGS. 1 and 2, the evaporator (1) according to the present invention comprises an evaporator core (2)
And a connecting member (3) joined to the right side of the evaporator core (2). A pipe connecting member (4) is joined to the right side of the connecting member (3). The evaporator (1) of this embodiment is made of aluminum (including aluminum alloy).
It is made, and the joining of the evaporator components described below is
Usually done by brazing.

The evaporator core (2) consists of two horizontal headers on the top and bottom.
(21) (22) and a plurality of vertical heat exchange tubes (2) which are arranged at a distance in the left-right direction and whose both ends are connected to the upper and lower headers (21) (22).
3) and are provided. Refrigerant inlet (2A) at right end of lower header (22)
Is provided, and the refrigerant outlet (2B) is provided at the right end of the upper header (21).

The evaporator core (2) has upper and lower header forming recesses (201) (202) and upper and lower header forming recesses (201).
A large number of core plates (20) continuous with (202) and having a recess (203) for heat exchange tube formation shallower than these recesses (201) (202) are recessed by two core plates (20). (201) (20
2) (203) It is formed by joining them so that they face each other. Further, as shown in FIG. 2, the lower header (22) is provided with an inner pipe for forming a multi-pass from its refrigerant inlet (2A).
(5) is inserted.

As shown in FIGS. 1 and 2, the evaporator core
A side plate (6) is arranged at the left end of (2). The side plate (6) has recesses (61) (62) of the same shape and size as the upper and lower header forming recesses (201) (202) at the upper and lower ends thereof, and these recesses (61) ( The bottom wall of 62) is joined to the bottom walls of the upper and lower header forming recesses (201) (202) of the core plate (20) located at the left end.

As shown in FIG. 1, adjacent heat exchange tubes (23)
The outer fins (in the gaps between the heat exchange pipes (23) and the side plates (6) located at the left end, the heat exchange pipes (23) located at the right end, and the connecting member (3), respectively. 7) is placed and fixed. The outer fin (7) is formed of, for example, a corrugated fin as shown in FIG. Figure 2
As shown in, the cooled air (A) is allowed to pass through the gap from the rear to the front.

FIG. 3 shows the heat exchange tube (23) of the evaporator core (2). The heat exchange tube forming concave portion (203) of the core plate (20) is divided into two front and rear portions by a partition convex ridge (204) formed in the width center thereof. Therefore, the inside of the heat exchange pipe (23) is also divided into two in the front and rear. The refrigerant flows in parallel in the same direction in the front and rear sections in the heat exchange pipe (23), but they join together in the upper header (21) or the lower header (22). Inner fins (8) are interposed in the front and rear sections of the heat exchange tube (23). Inner fin
(8) is formed by a corrugated fin as shown in FIG. 3, for example. Of course, the heat exchange pipe (23) may not be divided into front and rear as shown in FIG.

4 and 5 show the connecting member (3) together with the pipe connecting member (4) and the inner pipe (5). The communication member (3) has therein a refrigerant introduction path (3A) that connects the refrigerant inlet (2A) and a refrigerant introduction pipe (not shown), and a refrigerant outlet (2B) and a refrigerant discharge pipe (not shown). It has a refrigerant discharge path (3B) for communicating with. The connecting member (3) includes a first plate (31) and a second plate (32).

The first plate (31) has an inlet-side communication hole (31A) at its lower end and an outlet-side communication hole (31B) at its upper end, and these communication holes (31A) (31B). ) Is the refrigerant inlet (2A)
Also, it is joined to the right side of the evaporator core (2) so as to communicate with the refrigerant outlet (2B). In the first plate (31), a portion corresponding to the refrigerant inlet (2A), that is, the lower end is provided with an inlet-side concave portion (311), and a portion corresponding to the refrigerant outlet (2B), that is, the upper end. The section is provided with an outlet side recess (312). These recesses (311) (312) are the core plates (20).
It has the same shape and size as the upper and lower header forming recesses (201) and (202). The bottom walls of these recesses (311) (312) are the recesses (2) for forming the upper and lower headers of the core plate (20) located at the right end.
It is joined to the bottom wall of 01) (202). Inlet side communication hole (31A)
Is provided in the center of the bottom wall of the inlet-side concave portion (311) and has a circular shape having a hole diameter that substantially matches the outer diameter of the inner pipe (5). The outlet-side communication hole (31B) is provided in the bottom wall of the outlet-side recess (312) and has a long shape in the front-rear direction that is substantially similar to the shape of the bottom wall. At the middle of the front and rear edges of the first plate (31), a vertically elongated notch (31
3) is provided.

The second plate (32) has a recess (32A) for forming a refrigerant introduction path at a lower part thereof and a recess (32) for forming a refrigerant discharge path at an upper part thereof.
Have B). In the second plate (32), the lower end of the refrigerant introduction path forming recess (32A) is the inlet side communication hole (31A), and the upper end of the refrigerant discharge path forming recess (32B) is the outlet side communication hole (31B). ) Is joined to the outer side surface (right side surface) of the first plate (31). A refrigerant introduction pipe connection hole (321) is provided on the bottom wall of the upper end portion of the refrigerant introduction passage forming recess (32A). A coolant discharge pipe connection hole (322) is provided in the bottom wall of the lower end of the coolant discharge passage forming recess (32B). These connection holes (321) (322) are circular. The peripheral portions of the connection holes (321) (322) are projected outward (to the right).
A bent portion (323) bent inward (leftward) is provided at an intermediate height portion of the front and rear edges of the second plate (32). The bent portion (323) includes the first plate (31) and the second plate.
The (32) and the (32) are overlapped with each other, and are fitted into the notches (313) (see FIG. 1).

On the outer side surface (right side surface) of the first plate (31), a refrigerant introduction pipe connection hole (321) and a refrigerant discharge pipe connection hole (32
2) Two upper and lower refrigerant rectifying protrusions (310A) (310B) protruding toward each are formed.

The center of the lower refrigerant straightening protrusion (310A) coincides with the center of the refrigerant introduction pipe connecting hole (321). The center of the upper refrigerant rectifying protrusion (310B) is located at the refrigerant discharge pipe connection hole.
Consistent with the center of (322).

As shown in FIG. 4, the refrigerant rectifying projections (310A) and (310B) are of a substantially conical shape. These protrusions are
It may have a substantially conical shape or a substantially hemispherical shape.

The refrigerant introducing passage (3A) in the connecting member (3) is provided with two parallel refrigerant introducing branch passages near the refrigerant introducing pipe connecting hole (321).
The refrigerant introduction branch passage (30A) is formed so as to branch into (30A) and join near the inlet side communication hole (31A). In addition, the refrigerant discharge path (3B) is also connected to the outlet side communication hole (3
1B) is branched into two parallel refrigerant discharge branch passages (30B), and these refrigerant discharge branch passages (30B) are formed so as to join near the refrigerant discharge pipe connection hole (322). As described above, the refrigerant introduction path (3A) and the refrigerant discharge path (3B)
When each of them is branched into two branch passages (30A) and (30B), the width of the recesses (32A) and (32B) provided in the second plate (32) for forming these can also be reduced. In addition, the second plate (32) joined to the first plate (31)
The area of the flat part (324) is also increased. Therefore, the second
Even if the plate (32) is made of a thin material, sufficient pressure resistance against the flow of the refrigerant can be obtained.

The pipe connecting member (4) is a block-shaped member having two upper and lower holes (41) (42) penetrating in the thickness direction on the left and right. In this pipe connection member (4), the inner end of the lower hole (41) is the refrigerant introduction pipe connection hole (321), and the inner end of the upper hole (42) is the refrigerant discharge pipe connection hole.
It is joined to the outer side surface (right side surface) of the second plate (32) so as to respectively match with (322). At the outer end of the lower hole (41), a connection port (4A) into which the refrigerant introduction pipe is inserted and connected is formed so as to project outward. Further, at the outer end of the upper hole (42),
The connection port (4B) into which the refrigerant discharge pipe is inserted and connected is formed in an outwardly protruding shape. O-rings (9) are fitted on the base ends of these connection ports (4A) and (4B).

The inner pipe (5) for multi-pass formation is
An annular flange portion (51) is integrally provided at the base end (left end) thereof. And the flange part of the inner pipe (5)
(51) is the inlet side communication hole (31A) in the first plate (31)
Is joined to the peripheral edge of the. The joining of the flange portion (51) to the peripheral portion of the inlet-side communication hole (31A) is usually performed by brazing after temporarily fixing both by caulking.

As shown in FIG. 4, a part of the flange portion (51) of the inner pipe (5) is a flat portion (324) of the second plate (32), more specifically, a refrigerant introduction path ( In order to branch 3A) into two branch passages, a coolant introduction passage forming recess (32
It faces the lower end of the strip-shaped flat portion (324) provided at the center of the width of (A), and the remaining portion faces the lower end of the coolant introducing passage forming recess (32A) of the second plate (32). As described above, the flange portion (51) is brazed to the first plate.
It is firmly joined to the peripheral part of the inlet side communication hole (31A) of (31), but the flange part (51) of the inner pipe (5) comes off from the peripheral part of the inlet side communication hole (31A) due to force majeure. May happen. When such a situation occurs, the inner pipe removed from the first plate (31)
(5) is displaced to the right, and the entire flange (51) is in the second position.
If it comes into contact with the bottom wall of the lower end portion of the refrigerant introduction passage forming recess (32A) of the plate (32), the flow of the refrigerant into the inner pipe (5) is hindered or becomes intermittent, resulting in an evaporator. (1)
The function of is damaged, and eventually the car air conditioner itself does not function. On the other hand, FIG.
If the flange portion (51) partially faces the flat portion (324) of the second plate (32), the inner pipe (5) will come out of the first plate (31) due to force majeure. And the right side of the flange part (51) part and the second
Although in contact with the flat portion (324) of the plate (32), the refrigerant is present between the remaining portion of the flange portion (51) and the bottom wall of the lower end portion of the refrigerant introduction passage forming recess (32A) of the second plate (32). There is enough clearance for the water to flow into the inner pipe (5). Therefore, even if the above situation occurs, the function as the evaporator (1) is not significantly impaired, and the car air conditioner can be continuously used.

FIG. 6 shows the vicinity of the lower header (22) of the evaporator core (2). The inner pipe (5) is inserted into the lower header (22) of the evaporator core (2) through the inlet side communication hole (31A) and the refrigerant inlet (2A). Inner pipe (5)
2, the tip (left end) of the lower header (22) extends from the right end of the lower header (22) to about two-thirds of the length of the header (22).

As shown in FIG. 6, a through hole (202A) is formed in the bottom wall of the lower header forming recess (202) of the core plate (20). The through hole (202A) is substantially similar to the bottom wall of the recess (202) and is long in the front-rear direction. Therefore, there is a gap between the inner pipe (5) and the through hole (202A) around the inner pipe (5), through which the refrigerant can flow (FIG. 6).
(See (a)). However, the through hole (202X) formed in the bottom wall of the lower header forming recess (202) in the two core plates (20) located near the tip of the inner pipe (5) is It is a small circular shape having a hole diameter that substantially matches the outer diameter so that no gap is created between it and the inner pipe (5). That is, the bottom wall of the lower header forming recess (202) having these through holes (202X) constitutes a partition wall (221) that divides the lower header (22) into left and right (FIGS. 6 and 7). reference). Although not shown, the upper header forming recess (201) of the core plate (20) is formed.
Also on the bottom wall of the through hole (202A) of the lower header forming recess (202)
A through hole similar to is drilled. However, the evaporator core
The upper header forming recess (2) of the core plate (20) located approximately one third of the entire length of the evaporator core (2) from the right end of (2)
No through holes are made in the bottom wall of 01). The bottom wall constitutes a partition wall (221) that divides the upper header (21) into left and right parts (see FIG. 7). The two partition walls (211) and (221) and the inner pipe (5) are connected to the evaporator core (2).
The plurality of paths are formed in the evaporator core (2) by being arranged therein. Specifically, the evaporator core
A plurality of heat exchange tubes located on the left side of (2), with the lower end connected to the left section (22L) of the lower header (22) and the upper end connected to the left section (21L) of the upper header (21). By (23), the first pass (P1)
Are formed. Also, located in the center of the evaporator core (2), and the upper end in the left section (21L) of the upper header (21),
The second path (P2) is formed by the plurality of heat exchange tubes (23) whose lower ends are connected to the right section (21R) of the upper header (21). Further, it was located on the right part of the evaporator core (2), and the lower end was connected to the right section (22R) of the lower header (22), and the upper end was connected to the right section (21R) of the upper header (21). Multiple heat exchange tubes
The third path (P3) is formed by (23).

In FIG. 6, the distance (X) between the tip (left end) of the inner pipe (5) and the partition wall (221) of the lower header (22).
Is longer than the distance (Y) between the flange portion (51) provided at the base end (right end) of the inner pipe (5) and the flat portion (324) of the second plate (32). When the inner pipe (5) is dislocated from the first plate (31) to the right as described above, the tip of the inner pipe (5) naturally moves to the right. Where the inner pipe (5)
If the distance (X) between the tip and the partition wall (221) is shorter than the distance (Y) between the flange part (51) and the flat part (324), the inner pipe (5) should be directed toward the tip. Since the refrigerant that has flowed through is introduced into the compartment (22R) on the right side of the partition wall (221) in the lower header (22), the refrigerant flows inside the evaporator core (2) as it originally did. Therefore, there is a possibility that a sufficient air cooling effect cannot be obtained. On the other hand, as shown in FIG. 6, the distance (X) between the tip of the inner pipe (5) and the partition wall (221) is the distance (Y) between the flange portion (51) and the flat portion (324). )
If it is longer than this, even if the inner pipe (5) comes off and shifts to the right, the refrigerant that has flowed in the inner pipe (5) is in a partition (221) on the left side of the partition wall (221) in the lower header (22). Since it is introduced into the evaporator core (2), the flow of the refrigerant in the evaporator core (2) becomes normal and the desired air cooling effect is obtained.

FIG. 7 shows the flow of the refrigerant in the evaporator (1). Although not shown, the car air conditioner is composed of a refrigeration cycle including a compressor, a condenser, and an expansion valve in addition to the evaporator (1).

First, the gas-liquid two-phase state refrigerant decompressed by the expansion valve is cooled by the pilot hole (41) of the refrigerant introducing pipe and the pipe connecting member (4).
Through the refrigerant introduction pipe connection hole (321) to flow into the refrigerant introduction path (3A) of the communication member (3).

The refrigerant that has flowed in is connected to the refrigerant introduction pipe connection hole (321).
It collides with the outer side surface (right side surface) of the second plate (32) that faces the second plate (32), and thereby changes the direction substantially at a right angle to the refrigerant introduction path (3
After flowing through A), it flows into the evaporator core (2) through the refrigerant inlet (2A). At this time, the refrigerant that has flowed into the refrigerant introduction path (3A) is formed on the outer surface of the second plate (32) so as to face the refrigerant introduction pipe connection hole (321) and the lower refrigerant rectification protrusion (310A).
By flowing along the surface of, the flow direction changes smoothly, and turbulence is less likely to occur. Therefore, the protrusion (310A) prevents generation of noise due to the inflow of the refrigerant.

Next, the refrigerant is divided into two refrigerant introduction branch passages (30
Divide into A) and flow downward through these forks (30A),
After merging again near the inlet-side communication hole (31A), it flows into the inner pipe (5) from the base end (right end) side. Here, the refrigerant introduction path (3A) branches into two branch paths (30A) near the refrigerant introduction pipe connection hole (321), and these branch paths (30A)
Since they are re-merged near the inlet side communication hole (31A), the pressure loss of the refrigerant when flowing into the inner pipe (5) is smaller than that when the refrigerant introduction path (3A) is not branched. The refrigerant smoothly flows into the inner pipe (5). Therefore, the refrigerant flows into the evaporator core (2) efficiently, and the heat exchange efficiency is improved.

The refrigerant flowing in the inner pipe (5) flows into the left section (22L) of the lower header (22) in the evaporator core (2), from which the heat forming the first path (P1) is formed. Exchange Tube (23)
It flows upward inside and reaches the left side section (21L) of the upper header (21). Next, the refrigerant is the heat exchange tube that constitutes the second pass (P2).
Flows downward in (23) and is in the right compartment (22R) of the lower header (22).
Leading to. Further, the refrigerant flows upward in the heat exchange pipe (23) forming the third pass (P3), and the refrigerant flows to the right side section (2) of the upper header (21).
1R).

The refrigerant flowing through the right section (21R) of the upper header (21) flows into the refrigerant discharge passage (3B) of the communication member (3) through the refrigerant outlet (2B). The refrigerant that has flowed in is divided into two refrigerant discharge branch paths (30B), flows downward in these branch paths (30B), and merges again near the refrigerant discharge pipe connection hole (322).
From the refrigerant discharge pipe connection hole (322), the upper hole (42) of the pipe connection member (4)
And flows out to the refrigerant discharge pipe. Here, the refrigerant discharge path (3
The refrigerant flowing out of B) flows along the surface of the upper refrigerant rectification protrusion (310B) formed on the outer surface of the second plate (32) so as to face the refrigerant discharge pipe connection hole (322). , The flow direction changes smoothly and turbulence is less likely to occur. Therefore, the protrusion (310B) prevents the generation of noise accompanying the outflow of the refrigerant.

The above-described embodiment is merely an example, and it is needless to say that the present invention can be carried out with appropriate modifications within the scope not departing from the gist of the present invention described in the claims. is there.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of an evaporator.

FIG. 2 is a bottom view of the evaporator.

FIG. 3 is a horizontal sectional view showing one heat exchange tube of the evaporator core in the evaporator.

4A and 4B show a connecting member of an evaporator, a pipe connecting member, and an inner pipe for forming a multipass, wherein FIG. 4A is a side view and FIG. 4B is a vertical sectional view.

FIG. 5 is a perspective view showing an exploded view of a connecting member of the evaporator, a pipe connecting member, and an inner pipe for forming a multi-pass.

6A and 6B are views showing the vicinity of a lower header of an evaporator core in an evaporator, wherein FIG. 6A is a horizontal sectional view and FIG. 6B is a vertical sectional view.

FIG. 7 is a diagram showing the flow of refrigerant in the evaporator.

[Explanation of symbols]

(1) ... Evaporator (2)… Evaporator core (2A) ... Refrigerant inlet (2B) ... Refrigerant outlet (20)… Core plate (201) ... Recess for forming upper header (202) ... Lower header forming recess (203) ... Heat exchange tube forming recess (21)… Top header (22)… Lower header (23)… Heat exchange tubes (3) ... Contact member (3A) ... Refrigerant introduction path (3B) ... Refrigerant discharge path (31)… First plate (31A) ... Inlet side communication hole (31B) ... Communication hole on the outlet side (310A) (310B) ... Protrusion for refrigerant rectification (32)… Second plate (32A) ... Refrigerant introduction passage forming recess (32B) ... Refrigerant discharge passage forming recess (321)… Refrigerant introduction pipe connection hole (322) ... Refrigerant discharge pipe connection hole (4) ... Pipe connection member

Claims (12)

[Claims] 1. An evaporator core having a refrigerant inlet and a refrigerant outlet on one side thereof, and a refrigerant introducing passage which is joined to one side of the evaporator core and internally connects the refrigerant inlet and the refrigerant introducing pipe. And a communication member provided with a refrigerant discharge path for connecting the refrigerant outlet and the refrigerant discharge pipe, wherein the communication member has an inlet-side communication hole and an outlet-side communication hole, and these communication holes have a refrigerant inlet and It has a first plate joined to one side of the evaporator core so as to communicate with the refrigerant outlet, a refrigerant introduction passage forming concave portion and a refrigerant discharge passage forming concave portion, and one end portion of these concave portions communicates with the inlet side. The second plate is joined to the outer surface of the first plate so as to face the hole and the outlet-side communication hole, and the refrigerant introduction pipe connection hole is formed in the bottom wall of the other end of the refrigerant introduction passage forming recess to discharge the refrigerant. Refrigerant discharge to the bottom wall of the other end of the channel forming recess Connection holes are provided, and the refrigerant introduction pipe and the refrigerant discharge pipe are connected to these connection holes via a pipe connection member joined to the outer surface of the second plate. The evaporator in which the refrigerant rectification projections protruding toward the refrigerant introduction pipe connection hole of the second plate are formed on the outer surface. 2. The evaporator according to claim 1, wherein the center of the refrigerant rectifying protrusion coincides with the center of the refrigerant introducing pipe connection hole. 3. An evaporator core having a refrigerant inlet and a refrigerant outlet on one side, and a refrigerant introduction path joined to one side of the evaporator core and internally connecting the refrigerant inlet and the refrigerant introduction pipe. And a communication member provided with a refrigerant discharge path for connecting the refrigerant outlet and the refrigerant discharge pipe, wherein the communication member has an inlet-side communication hole and an outlet-side communication hole, and these communication holes have a refrigerant inlet and It has a first plate joined to one side of the evaporator core so as to communicate with the refrigerant outlet, a refrigerant introduction passage forming concave portion and a refrigerant discharge passage forming concave portion, and one end portion of these concave portions communicates with the inlet side. The second plate is joined to the outer surface of the first plate so as to face the hole and the outlet-side communication hole, and the refrigerant introduction pipe connection hole is formed in the bottom wall of the other end of the refrigerant introduction passage forming recess to discharge the refrigerant. Refrigerant discharge to the bottom wall of the other end of the channel forming recess Connection holes are provided, and the refrigerant introduction pipe and the refrigerant discharge pipe are connected to these connection holes via a pipe connection member joined to the outer surface of the second plate. An evaporator having a refrigerant rectifying protrusion protruding toward the refrigerant discharge pipe connection hole of the second plate on the outer surface. 4. The evaporator according to claim 3, wherein the center of the refrigerant rectifying protrusion is aligned with the center of the refrigerant discharge pipe connecting hole. 5. An evaporator core having a refrigerant inlet and a refrigerant outlet provided on one side, and a refrigerant introduction path joined to one side of the evaporator core and internally connecting the refrigerant inlet and the refrigerant introduction pipe. And a communication member provided with a refrigerant discharge path for connecting the refrigerant outlet and the refrigerant discharge pipe, wherein the communication member has an inlet-side communication hole and an outlet-side communication hole, and these communication holes have a refrigerant inlet and It has a first plate joined to one side of the evaporator core so as to communicate with the refrigerant outlet, a refrigerant introduction passage forming concave portion and a refrigerant discharge passage forming concave portion, and one end portion of these concave portions communicates with the inlet side. The second plate is joined to the outer surface of the first plate so as to face the hole and the outlet-side communication hole, and the refrigerant introduction pipe connection hole is formed in the bottom wall of the other end of the refrigerant introduction passage forming recess to discharge the refrigerant. Refrigerant discharge to the bottom wall of the other end of the channel forming recess Connection holes are provided, and the refrigerant introduction pipe and the refrigerant discharge pipe are connected to these connection holes via a pipe connection member joined to the outer surface of the second plate. An evaporator in which two refrigerant rectifying projections are formed on the outer side surface and project toward the refrigerant introduction pipe connection hole and the refrigerant discharge pipe connection hole of the second plate, respectively. 6. The evaporator according to claim 5, wherein the centers of the two refrigerant rectification projections are aligned with the centers of the refrigerant introduction pipe connection hole and the refrigerant discharge pipe connection hole, respectively. 7. The evaporator according to claim 4, wherein the refrigerant rectifying projection has a substantially conical shape. 8. The evaporator according to claim 1, wherein the refrigerant rectifying protrusion has a substantially truncated cone shape. 9. The evaporator according to claim 1, wherein each of the refrigerant rectifying protrusions has a substantially hemispherical shape. 10. The evaporator core comprises two horizontal headers, an upper and a lower horizontal header, and a plurality of vertical heat exchange tubes which are arranged at intervals in the left and right directions and whose both ends are connected to the upper and lower headers, and a refrigerant inlet is provided. The evaporator according to any one of claims 1 to 9, wherein the evaporator is provided on one of the one ends of the upper and lower headers, and the refrigerant outlet is provided on the other end. 11. An evaporator core is provided with a plurality of core plates each having two upper and lower header forming recesses and two heat exchanging tube forming recesses, both ends of which are continuous with the upper and lower header forming recesses and shallower than these recesses. 11. The core plates are joined together such that the recesses face each other.
Evaporator as described. 12. A refrigeration cycle comprising the evaporator according to any one of claims 1 to 11.