JPH06194001A - Refrigerant evaporator - Google Patents

Abstract

PURPOSE:To make it possible to make uniform the temperature distribution of air let out from a multilayer type refrigerant evaporator. CONSTITUTION:A multilayer type refrigerant evaporator 1 is so constructed that a refrigerant flowing from an inlet piping 3 into a flow channel pipe 2a provided adjacently thereto in approximately a central part is led to outermost flow channel pipes 2c and 2d on the opposite sides through a central tank 20, distributed equally to each of a plurality of refrigerant evaporating flow channels 10 from these outermost flow channel pipes 2c and 2d through an inlet tank 19 and then made to flow out to an outlet piping 4 through an outlet tank 21 from a flow channel pipe 2b provided adjacently thereto in about the central part. Thereby a course difference between refrigerant channels from the inlet piping 3 to the outlet piping 4 is eliminated, even when any of the refrigerant evaporating channels 10 is taken, and a difference in a loss of pressure of the refrigerant between the refrigerant channels is also eliminated. Accordingly, the cooling capacity of air passing outside the flow channel pipes 2a and 2b provided adjacently in the part being central virtually and that of the air passing outside the outermost flow channel pipes 2c and 2d become equal substantially.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant evaporator formed by stacking a plurality of flat flow passage tubes for exchanging heat between a refrigerant and air.

[0002]

2. Description of the Related Art Conventionally, in Japanese Laid-Open Patent Publication No. 63-267868, two tank portions at one end and a flat flow passage tube having a refrigerant evaporation flow passage formed at the other end and corrugated fins are alternated. In order to standardize the shape by using a box-type expansion valve, the inlet pipe and the outlet pipe are arranged next to each other in the approximate center of the stacking direction of the plurality of flow pipes. Type refrigerant evaporators have been proposed. In such a conventional laminated refrigerant evaporator, as shown in FIG. 13, an inlet pipe a → an inlet tank b → a plurality of inlet side refrigerant evaporation passages c → an intermediate tank d → a plurality of outlet side refrigerant evaporation flows. The refrigerant flows along the path e → the outlet tank f → the outlet pipe g (a so-called front / rear / left / right turn type refrigerant evaporator).

[0003]

However, in the conventional laminated refrigerant evaporator, as shown in FIG.
Refrigerant flow path of b → c1 → d → e1 → f → g and a → b → c
2 → d → e2 → f → g Refrigerant flow paths cause passage differences.
As a result, the pressure loss of the refrigerant varies depending on the path of the refrigerant flow path, so that the flow of the refrigerant is short circuit (a
→ b → c2 → d → e2 → f → g) may occur. As a result, by reducing the refrigerant passing through the outermost flow path tube arranged on the outermost side of the plurality of flow path tubes,
Since the cooling capacity of the air passing outside the outermost flow passage pipe is reduced, the temperature of the blown air passing near the outermost flow passage pipe becomes high, and there is a problem that the blown air temperature distribution deteriorates.

According to the present invention, a refrigerant evaporator capable of making the temperature distribution of blown air uniform by eliminating the passage difference of the refrigerant flow path from the inlet pipe to each of the plurality of refrigerant evaporation flow paths to the outlet pipe. For the purpose of providing.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a plurality of flow passage pipes are provided which are arranged in the width direction and through which a refrigerant flows, and flow passages which are adjacent to each other at a substantially central portion of the flow passage pipes in the arrangement direction. In the refrigerant evaporator, the inlet pipe sandwiched between the passage pipes and the outlet pipe sandwiched between the flow passage pipes provided adjacent to the inlet pipe and adjacent to each other at the substantially central portion are provided. Refrigerant evaporation passages for heat-exchanging the refrigerant to evaporate the refrigerant are respectively formed in the passage tubes of, and one end portion of these refrigerant evaporation passages is arranged in the direction in which the plurality of passage tubes are arranged. Extend 3
Two tanks are provided. The three tanks communicate with the inlet pipe through the flow passage pipes adjacent to each other at the substantially central portion, and the outermost flow disposed on the outermost side of the flow passage pipes adjacent to each other at the substantially central portion. A first tank for guiding the refrigerant to the passage pipe; and a first tank communicating with the first tank at the outermost flow passage pipe and distributing the refrigerant from the outermost flow passage pipe to each of the plurality of refrigerant evaporation flow passages. A flow passage pipe that communicates with two tanks by a flow passage pipe that is adjacent to the outlet pipe at the substantially central portion, and that refrigerant that has flowed in from each of the plurality of refrigerant evaporation flow passages is provided adjacent to the substantially central portion. The technical means consisting of a third tank leading to

[0006]

In the present invention, the refrigerant flows from the inlet pipe into the first tank through the flow passage pipes adjacent to each other in the central portion of the plurality of flow passage pipes in the row direction. The refrigerant flowing into the first tank is guided to the outermost flow passage pipe through the first tank, and then flows into the second tank through the outermost flow passage pipe. The refrigerant flowing into the second tank is distributed to each of the plurality of refrigerant evaporation passages when passing through the second tank. The refrigerant flowing into the plurality of refrigerant evaporation passages exchanges heat with the air passing through the outside of the plurality of passage tubes to be evaporated and vaporized, and then flows into the third tank. The refrigerant flowing into the third tank flows out into the outlet pipe through the adjacent flow passage pipes at the central portion of the plurality of flow passage pipes in the row direction.
With this, the refrigerant flowing from the inlet pipe into the plurality of flow passage pipes has a small passage difference of the refrigerant flow passages regardless of which flow pipe is distributed to the outlet pipe. There is no difference in pressure loss between the refrigerants. As a result,
The refrigerant is evenly distributed to each of the plurality of flow path tubes without causing a short circuit when the refrigerant flows through the plurality of flow path tubes. Therefore, it is possible to evenly flow the refrigerant to the refrigerant evaporation flow path of the flow path tube and the refrigerant evaporation flow path of the outermost flow path tube that are adjacent to each other at the substantially central portion in the row direction of the plurality of flow path tubes.

[0007]

EXAMPLES Next, a refrigerant evaporator of the present invention will be described based on a plurality of examples shown in FIGS. [Structure of First Embodiment] FIGS. 1 to 11 show a first embodiment of the present invention.
An example is shown. 1 and 2 are diagrams showing the flow of the refrigerant in the laminated refrigerant evaporator, and FIG. 3 is a diagram showing the laminated refrigerant evaporator. The laminated refrigerant evaporator 1 includes a plurality of flow passage tubes 2a to 2d stacked in the width direction and a pair of flow passage tubes 2a and 2b adjacent to each other at a substantially central portion of the flow passage tubes in the stacking direction. An inlet pipe 3 and an outlet pipe 4 are provided. A corrugated fin 5 for improving the heat exchange efficiency between the refrigerant and the air is joined to the adjacent passage pipe 2 by means such as brazing. The side plate 6 is joined to the outside of the outermost flow passage pipes 2c and 2d arranged on the outermost side of the plurality of flow passage pipes 2 by means such as brazing.

The flow path tubes 2, 2a, 2b are formed by joining a pair of molding plates 7. As shown in FIGS. 4 and 5, the molding plate 7 is formed into a predetermined shape by pressing a thin plate-shaped aluminum alloy. On the outer peripheral edge of the forming plate 7, a joint wall 8 is formed which is joined to the outer peripheral edge of the other opposing forming plate 7 by means such as brazing. A partition wall 9 is formed at the center of the molding plate 7 so as to be joined to the center of the other molding plate 7 that faces the molding plate 7 by means such as brazing.

Between the joint wall 8 and the partition wall 9,
A substantially U-shaped refrigerant evaporation flow path 10 in which the refrigerant flows so that the refrigerant and the air are heat-exchanged to evaporate the refrigerant and the refrigerant flows in a counterflow with respect to the flow direction of the air in order to improve the heat exchange performance. It is shaped like a shallow dish. A large number of ribs 11 are formed in the refrigerant evaporation flow passage 10 so as to spread the refrigerant widely, and intersect with the ribs 11 of the other molding plate 7 facing each other. In this embodiment, the partition wall 9 is formed obliquely so that the refrigerant evaporation passage 10 is formed so that the passage area increases from the inlet toward the outlet.

Further, three bowl-shaped projections 12 to 14 projecting in a direction orthogonal to the plane direction are formed at the upper end of the refrigerant evaporation passage 10. Bowl-shaped protrusions 1 on both sides
The two and 14 communicate with each other through the refrigerant evaporation passage 10.
Further, circular bowl-shaped communication holes 15 to 17 for communicating with the pair of molding plates 7 of the flow path pipe 2 adjacent to each other are formed in the three bowl-shaped protrusions 12 to 14, respectively. In addition,
As shown in FIGS. 6 and 7, the outermost flow path pipes 2c, 2
bowl-shaped protrusions 12 and 13 of the molding plate 7a forming d
Only are directly communicated with each other via a communication passage 18 formed at the upper end of the molding plate 7b forming the outermost flow passage tubes 2c, 2d.

Further, as shown in FIGS. 3 and 8, in the flow path pipes 2a and 2b adjacent to each other at the substantially central portion, two molding plates 7 on the side in contact with the inlet pipe 3 and the outlet pipe 4 are provided. The amount of protrusion of the bowl-shaped protrusions 13 and 14 is smaller than that of the bowl-shaped protrusion 12 so that the rear ends of the inlet pipe 3 and the outlet pipe 4 can be easily sandwiched. And the flow path pipes 2, 2a-2
By stacking a plurality of d, that is, by stacking a plurality of the pair of molding plates 7 having the three bowl-shaped protrusions 12 to 14, as shown in FIG. Inlet tank 1 at the top of ~ 2d
9, the central tank 20, and the outlet tank 21 are formed so as to extend in the width direction of the laminated refrigerant evaporator 1.

The inlet tank 19 is the second tank of the present invention and is provided on the most leeward side in the air flow direction among the three tanks, and the upstream side is the outermost flow path pipes 2c, 2d on both sides.
And communicates with the central tank 20 via the communication passage 18, and the downstream side communicates with the respective inlets of the plurality of refrigerant evaporation flow paths 10. The inlet tank 19 is a channel that evenly distributes the refrigerant flowing inward toward the substantially central portion to each of the plurality of refrigerant evaporation channels 10.

The central tank 20 is the first tank of the present invention, and the flow path pipes 2a, 2b adjacent to each other on the upstream side are substantially central portions.
And communicates with the refrigerant inlet flow path 30 of the inlet pipe 3 via the communication hole 16. The central tank 20 directs the refrigerant flowing from the refrigerant inlet passage 30 of the inlet pipe 3 to both sides (left and right direction) from the substantially central portion of the plurality of passage pipes 2. That is,
The central tank 20 includes the flow path pipes 2a and
It is a flow path for guiding the refrigerant from b to the outermost flow path pipes 2c, 2d on both sides.

The outlet tank 21 is the third tank of the present invention, is provided on the most windward side in the air flow direction of the three tanks, and the upstream side communicates with the outlets of the plurality of refrigerant evaporation flow paths 10. However, the flow path pipe 2 where the downstream side is adjacent to the substantially central part
The refrigerant outlet channel 39 of the outlet pipe 4 via the communication hole 17
Is in communication with. The outlet tank 21 collects the refrigerant that has flowed in from the outlets of the plurality of refrigerant evaporation passages 10 and directs it toward the adjacent passage pipe 2c at the substantially central portion and flows out to the refrigerant outlet passage 39 of the outlet pipe 4. This is a flow path.

As shown in FIGS. 8 to 10, the inlet pipe 3 is connected at its tip end to a block 22 for mounting a box type expansion valve (not shown) of the refrigeration cycle. Further, the inlet pipe 3 is formed by joining a pair of molding plates 23 so that the cross-sectional shape is a flat elliptical shape. As shown in FIG. 10, the molding plate 23 is formed into a predetermined shape by pressing a thin plate-shaped aluminum alloy. At the rear end of the molding plate 23, a sandwiched portion 24 is formed which is sandwiched between the two bowl-shaped protrusions 13 and 14 of the molding plate 7 of the flow path tubes 2a and 2b adjacent to each other at the substantially central portion. There is. The sandwiched portion 24 is provided with two bowl-shaped projecting portions 25 and 26 so as to come into contact with the adjacent flow path pipes 2a and 2b at the substantially central portion.

Further, the two bowl-shaped protrusions 25 and 26 are
Circular communication holes 27, 28 for communicating with the central tank 20 and the outlet tank 21 are formed at the upper ends of the plurality of flow path pipes 2, 2a to 2d, respectively. Also,
On the outer peripheral edge of the forming plate 23, a joint wall 29 is formed which is joined to the outer peripheral edge of the other opposing forming plate 23 by means such as brazing. Then, inside the joint wall 29, the low-temperature low-pressure mist-like refrigerant flowing in from the box-type expansion valve bypasses the bowl-shaped protrusion 26 and then the bowl-shaped protrusion 25.
A substantially S-shaped coolant inlet flow path 30 is formed for leading to. In addition, the refrigerant inlet channel 30 and the bowl-shaped protruding portion 26 are
It is partitioned by a partition wall 31 that is joined to the corresponding portion of the other molding plate 23 by means such as brazing.

As shown in FIGS. 8, 9 and 11, the outlet pipe 4 is connected at its tip to the block 22. Further, the outlet pipe 4 is formed by joining a pair of molding plates 32 so as to have a flat elliptical cross section. As shown in FIGS. 8 and 11, the molding plate 32 is formed into a predetermined shape by pressing a thin plate-shaped aluminum alloy. At the rear end of the molding plate 32, a sandwiched portion 33 is formed which is sandwiched between the two bowl-shaped protrusions 13 and 14 of the molding plate 7 of the flow path tube 2b adjacent to each other at the substantially central portion. The sandwiched portion 33 is provided with two bowl-shaped projecting portions 34 and 35 so as to come into contact with the adjacent flow path pipes 2b at the substantially central portion.

The two bowl-shaped protrusions 34 and 35 are
Circular communication holes 36 and 37 for communicating with the central tank 20 and the outlet tank 21 are formed at the upper ends of the plurality of flow path pipes 2, 2a to 2d, respectively. Also,
On the outer peripheral edge of the forming plate 32, a joint wall 38 is formed to be joined to the outer peripheral edge of the other opposing forming plate 32 by means such as brazing. Then, inside the joint wall 38, the bowl-shaped protrusions 35 are formed from the plurality of refrigerant evaporation flow paths 10.
A substantially C-shaped refrigerant outlet passage 39 is formed for guiding the gas-phase refrigerant flowing therein into a refrigerant compressor (not shown) through a refrigerant passage formed in the box-type expansion valve. In addition,
The coolant outlet channel 39 and the bowl-shaped protrusion 35 are partitioned by a partition wall 40 that is joined to the corresponding portion of the other molding plate 23 by means such as brazing.

[Operation of First Embodiment] Next, the operation of the laminated refrigerant evaporator 1 will be briefly described with reference to FIGS. 1 to 11. The low-temperature low-pressure atomized refrigerant that has been adiabatically expanded when passing through the box-type expansion valve passes through the refrigerant inlet passage 30 of the inlet pipe 3. At this time, the atomized refrigerant bypasses the lower portion of the outlet tank 21 formed at the upper ends of the plurality of flow path pipes 2, 2a to 2d, and passes through the communication holes 28 and 15 to the central tank 2.
Guided within 0.

The mist-like refrigerant introduced into the central tank 20 is directed toward the outermost flow passage pipes 2c and 2d on both sides of the flow passage pipes 2a and 2b adjacent to each other in the substantially central portion of the laminated refrigerant evaporator. 1 in the left-right direction, and flows into the inlet tank 19 through the communication passage 18 of the outermost flow passage pipes 2c and 2d. The atomized refrigerant flowing into the inlet tank 19 is the outermost flow path pipe 2 on both sides.
The refrigerant vaporization flow passages 10 are evenly distributed from the c and 2d toward the flow passage pipes 2a and 2b adjacent to each other at the substantially central portion. Then, the atomized refrigerant evenly distributed to each of the plurality of refrigerant evaporation passages 10 exchanges heat with the air passing through the outside of the plurality of passage tubes 2, 2a to 2d toward the vehicle interior to cool the air. To do.

The mist-like refrigerant evaporates and vaporizes by exchanging heat with the air while flowing in a U-shape in the plurality of refrigerant evaporating flow paths 10 so as to face the air flow, and the plurality of refrigerant evaporating streams are formed. It becomes a vapor-phase refrigerant near the outlet of the passage 10 and flows into the outlet tank 21. The gas-phase refrigerant that has flowed into the outlet tank 21 is directed to the adjacent flow passage pipe 2c at the substantially central portion,
It flows into the outlet pipe 4 through the communication holes 17 and 37. The vapor-phase refrigerant flowing into the outlet pipe 4 is sucked into the refrigerant compressor through the refrigerant passage formed in the box type expansion valve.

[Effects of First Embodiment] As described above, the laminated refrigerant evaporator 1 has the plurality of flow path pipes 2 and 2 from the inlet pipe 3.
The atomized refrigerant that has flowed into each of the refrigerant evaporation passages 10 a to 2 d is distributed to any of the passage tubes 2 and 2 a to 2 d of the refrigerant evaporation passage 10 from the inlet pipe 3 to the outlet pipe 4. Since the passage lengths of the flow passages are uniform, the plurality of flow passage pipes 2, 2
There is no difference in refrigerant pressure loss between each of the a to 2d refrigerant evaporation passages 10. Thereby, the plurality of flow path pipes 2, 2a
A short circuit of the flow of the refrigerant does not occur when the refrigerant flows through each of the refrigerant evaporation passages 10 of 2d. Therefore, the refrigerant can be evenly distributed to each of the refrigerant evaporation flow paths 10 of the plurality of flow path tubes 2, 2a to 2d.

Therefore, the flow passage tube 2 adjacently provided in the substantially central portion
a, 2b Cooling capacity of air passing outside and outermost flow passage tube 2
Since the cooling capacity of the air passing outside c and 2d can be made substantially equal, the temperature of the blown air passing near the outermost flow passage pipes 2c and 2d and the flow passage pipe 2a that is adjacent in the substantially central portion,
The temperature of the blown air passing near 2b can be made substantially the same. Therefore, the plurality of flow path pipes 2, 2a-
The blown air temperature distribution can be made substantially uniform over 2d.

[Second Embodiment] FIG. 12 shows a second embodiment of the present invention and is a view showing the vicinity of the inlet pipe and the outlet pipe of the laminated refrigerant evaporator 1. A pair of straightening plates 41 are arranged between the bowl-shaped protruding portions 25 of the pair of molding plates 23 of the inlet pipe 3 of this embodiment. These straightening plates 41 are
From the refrigerant inlet flow passage 30, the refrigerant flows uniformly through the central tank 20 to the outermost flow passage pipes 2c and 2d on both sides.

[Modification] In this embodiment, the refrigerant evaporation passage 1
Although the refrigerant is allowed to flow counter to the air flow direction in 0, the refrigerant may be allowed to flow parallel to the air flow direction in the refrigerant evaporation passage.
In this embodiment, three tanks are provided along the air flow direction, an outlet tank (third tank) 21, a central tank 20 (first tank).
Tank) and the inlet tank 19 (second tank) are formed in this order, but the three tanks may be formed in the order of the first tank, the second tank, and the third tank in the air flow direction, and the design may be freely changed. Is also good. In the present embodiment, the present invention is used for the laminated refrigerant evaporator 1, but the present invention may be used for a plate fin tube refrigerant evaporator, a corrugated fin tube refrigerant evaporator, and the like.

[0026]

As described above, according to the present invention, the cooling capacity of the air passing through the outside of the flow passage pipe adjacent to it in the substantially central portion and the cooling capacity of the air passing through the outside of the outermost flow passage pipe are substantially equal. As a result, the temperature of the blown air passing near the outermost flow passage pipe becomes close to the temperature of the blown air passing near the adjacent flow passage pipe at the substantially central portion.
The blown air temperature distribution can be made substantially uniform over the plurality of flow path pipes.

[Brief description of drawings]

FIG. 1 is a perspective view showing a refrigerant flow of a laminated refrigerant evaporator according to a first embodiment of the present invention.

2 is a plan view showing a refrigerant flow in the laminated refrigerant evaporator of FIG. 1. FIG.

FIG. 3 is a front view showing the laminated refrigerant evaporator according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of the laminated refrigerant evaporator of FIG.

FIG. 5 is a front view showing a molded plate of a flow channel tube.

6 is a cross-sectional view showing the vicinity of the outermost flow path pipe of the laminated refrigerant evaporator of FIG.

FIG. 7 is a front view showing a molded plate of the outermost flow channel tube.

8 is a cross-sectional view showing the vicinity of an inlet pipe and an outlet pipe of the laminated refrigerant evaporator of FIG.

9 is a perspective view showing the vicinity of an inlet pipe and an outlet pipe of the laminated refrigerant evaporator of FIG.

FIG. 10 is a side view showing a molded plate of a flow path pipe and an inlet pipe adjacent to each other at a substantially central portion.

11 is a perspective view showing the vicinity of the outlet pipe of the laminated refrigerant evaporator of FIG.

FIG. 12 is a cross-sectional view showing the vicinity of an inlet pipe and an outlet pipe of a laminated refrigerant evaporator according to a second embodiment of the present invention.

FIG. 13 is a perspective view showing a refrigerant flow in a conventional laminated refrigerant evaporator.

FIG. 14 is a plan view showing a refrigerant flow in a conventional laminated refrigerant evaporator.

[Explanation of symbols]

 1 Laminated Refrigerator Evaporator 2 Flow Pipe 2a Flow Pipe 2a Adjacent to the Central Part 2b Flow Pipe 2a Adjacent to the Central Region 2c Outermost Flow Pipe 2d Outermost Flow Pipe 3 Inlet Pipe 4 Outlet Pipe 10 Refrigerant Evaporation Flow Path 19 Inlet Tank (Second Tank) 20 Central Tank (First Tank) 21 Outlet Tank (Third Tank)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Elbow ▼ Kasutan 1-1-1, Showa-cho, Kariya city, Aichi Prefecture Nihondenso Co., Ltd.

Claims (1)

[Claims] 1. A plurality of flow passage pipes which are arranged in the width direction and through which a refrigerant flows, and an inlet which is sandwiched between adjacent flow passage pipes at substantially central portions of the flow passage pipes in the arrangement direction. In a refrigerant evaporator comprising a pipe and an outlet pipe provided adjacent to the inlet pipe and sandwiched between adjacent flow pipes in the substantially central portion, the plurality of flow pipes include a refrigerant. Are formed to form a refrigerant evaporation flow path for evaporating the refrigerant by heat exchange with, and at one end of each of the refrigerant evaporation flow paths, three tanks extending in the direction in which the plurality of flow path tubes are arranged are provided. The three tanks are connected to the inlet pipe by flow passage pipes adjacent to each other in the substantially central portion, and are outermost flow passage pipes arranged on the outermost side of the flow passage pipes adjacent to each other in the substantially central portion. A first tank for guiding the refrigerant to the first tank, and the first tank communicates with the outermost flow path pipe, and A second tank that distributes a refrigerant from the outer flow path pipe to each of the plurality of refrigerant evaporation flow paths communicates with the outlet pipe through a flow path tube that is adjacent to the outlet pipe at the substantially central portion, and the plurality of refrigerant evaporation A refrigerant evaporator, comprising: a third tank for guiding the refrigerant flowing in from each of the flow paths to the flow path pipe adjacent in the substantially central portion.