JP2687593B2 - Refrigerant condenser - Google Patents

Description

TECHNICAL FIELD The present invention relates to a refrigerant condenser.

[Prior Art] As shown in FIG. 6, a conventional refrigerant condenser is one in which a hollow flat tube 101 formed by extrusion is bent in a meandering shape, and corrugated fins 102 are arranged between the tubes 101. there were.

[Problems to be Solved by the Invention] In the above-described conventional refrigerant condenser, since the tube 101 is formed by extrusion, the cross-sectional shape of the tube 101 is always constant. For this reason, the refrigerant passage area of the tube 101 from the inlet to the outlet of the gas refrigerant of the refrigerant condenser is always constant.

The gas refrigerant flowing into the refrigerant condenser is liquefied and condensed by flowing through the tube 101, so that the dryness of the refrigerant gradually decreases as shown by the broken line (a) in FIG.
As the dryness decreases, the flow rate of the refrigerant in the tube 101 decreases. As a result, as shown by the broken line (b) in FIG. 4, as it goes toward the outlet of the refrigerant condenser,
The heat transfer rate will decrease. As a result, the average heat transfer coefficient of the refrigerant condenser is lowered, and the refrigerant condensing ability of the refrigerant condenser is deteriorated.

Further, in the conventional refrigerant condenser, since the refrigerant flow rate on the refrigerant inlet side is large, the pressure loss on the refrigerant inlet side of the refrigerant condenser increases as shown by the broken line (c) in FIG. The refrigerant condensing capacity was deteriorated.

An object of the present invention is to provide a refrigerant condenser having a high refrigerant condensing capacity.

[Means for Solving the Problems] To achieve the above object, the refrigerant condenser of the present invention employs the following technical means.

The refrigerant condenser includes a plurality of tubes and headers connected to both ends of the plurality of tubes. In addition, the inside of the header is provided with an inlet chamber that distributes and supplies the inflowing gas refrigerant to a plurality of tubes, and a return chamber that guides the refrigerant that has passed through the tubes to other tubes. Further, the inlet chamber and the return chamber communicate with each other by a bypass means that bypasses the tube.

[Operation] The gas refrigerant flows into the inlet chamber of the refrigerant condenser. A part of the gas refrigerant flowing into the inlet chamber is directly guided to the tube, and the other refrigerant flows into one or a plurality of return chambers via the bypass means. The gas refrigerant flowing into the return chamber via the bypass means is mixed with the condensed refrigerant flowing into the return chamber through the tube. As a result, the degree of dryness of the refrigerant guided from the return chamber to the tube increases. That is, during the flow of the refrigerant in the refrigerant condenser,
The dryness of the refrigerant increases.

Further, among the gas refrigerant flowing into the inlet chamber of the refrigerant condenser, a part of the gas refrigerant is guided as it is to the tube communicating with the inlet chamber, while the other gas refrigerant bypasses the tube on the inlet side and Guided to the return room. For this reason,
The refrigerant flow rate on the inlet side of the refrigerant condenser becomes smaller than that in the conventional case.

[Effects of the Invention] As described in the above operation, the present invention increases the dryness of the refrigerant during the flow of the refrigerant in the refrigerant condenser, so that the average heat transfer coefficient of the refrigerant condenser improves and the refrigerant The refrigerant condensing ability of the condenser is improved.

Further, since the flow rate of the refrigerant on the inlet side of the refrigerant condenser is smaller than that in the conventional case, the pressure loss on the refrigerant inlet side is reduced and the refrigerant condensing capacity of the refrigerant condenser is improved.

[Embodiment] Next, a refrigerant condenser of the present invention will be described based on an embodiment shown in the drawings.

(Structure of Embodiment) FIG. 1 is a sectional view of a refrigerant condenser.

The refrigerant condenser 1 is a component of a refrigeration cycle (not shown), and liquefies and condenses a high-temperature, high-pressure gas refrigerant sent from a refrigerant compressor (not shown). Refrigerant condenser 1
Is brazed with a metal material (for example, aluminum) having excellent corrosion resistance and high heat transfer coefficient, and is roughly divided into a tube 2, a corrugated fin 3, a first header 4, and a second header 5.

Next, the tube 2, the corrugated fin 3, the first header 4 and the second header 5 will be described.

a) Description of the tube 2.

The tube 2 is a flat tube and has a large number of refrigerant passages formed therein. In this embodiment, 14 tubes 2 are used.

The plurality of tubes 2 of the present embodiment include four first going tubes 6 and two first returning tubes 7 from above in the drawing.
Are divided into three second going tubes 8, two second returning tubes 9 and three third going tubes 10.
It should be noted that these classifications are made by the chambers defined in the first header 4 and the second header 5, and each chamber will be described later.

b) Description of the corrugated fin 3.

The corrugated fins 3 are sandwiched between the tubes 2 to improve the heat exchange efficiency between the air flowing between the tubes 2 and the refrigerant flowing in the tubes 2. The corrugated fins 3 are formed by bending an extremely thin plate material in a wavy shape. It was provided by.

c) Description of the first header 4.

The first header 4 is a tank that is connected to one end of the 14 tubes 2, and includes a tubular body 11, a separator 12, a bypass pipe 13, a cap 14, and an inflow pipe 15.

The tubular body 11 is a tubular container, and has 14 tube insertion holes for inserting the ends of the tube 2 in the side wall.

The separator 12 is arranged inside the first header 4 from above.
The partition wall divides the inlet chamber 16, the second return chamber 17, and the fourth return chamber 18. The inlet chamber 16 is a space that communicates with the first going tube 6. Also, the second return chamber 17
It is a space that communicates with the first return tube 7 and the second going tube 8. Further, the fourth return chamber 18 is a space that communicates with the second return tube 9 and the third going tube 10.

As shown in FIG. 2, the separator 12 of this embodiment is inserted into the tubular body 11 through a slit portion 19 formed on the side wall of the tubular body 11. The round hole 20 formed in the separator 12 is a hole into which the bypass pipe 13 is inserted after the separator 12 is inserted into the tubular body 11.

The bypass pipe 13 is the bypass means of the present invention, and is the inlet chamber 16
The gas refrigerant that has flowed into the first going tube 6 and the first return tube 7 is guided to the second return chamber 17, and the gas refrigerant that has flowed into the inlet chamber 16 can be taken into the first going tube 6 and the first return tube 17. Tube 7, second bound tube 8, second
It bypasses the return tube 9 and guides it to the fourth return chamber 18. Therefore, the bypass pipe 13 is provided so that both ends thereof are open and the intermediate portion is opened in the second return chamber 17.

The caps 14 are lids attached to both ends of the tubular body 11. An inflow pipe 15 is inserted through the upper cap 14.

The inflow pipe 15 is a pipe for supplying the high-temperature high-pressure gas refrigerant discharged from the refrigerant compressor into the inlet chamber 16, and is connected to the discharge side of the refrigerant compressor via a refrigerant pipe (not shown).

d) Description of the second header 5.

The second header 5 is a tank connected to the other end of the tube 2, and includes a tubular body 21, a separator 22, a cap 23, and an outflow pipe 24.

The tubular body 21 is the same as the tubular body 11 of the first header 4, and has 14 tube insertion holes for inserting the ends of the tubes 2 into the side walls,
Also, two slit portions 25 into which the separator 22 is inserted are formed.

The separator 22 is arranged inside the second header 5 from above.
The partition wall divides the first return chamber 26, the third return chamber 27, and the outlet chamber 28. The first return chamber 26 is a space that communicates with the first going tube 6 and the first returning tube 7. The third return chamber 27 is a space that communicates with the second going tube 8 and the second returning tube 9. Further, the outlet chamber 28 is a space communicating with the third going tube 10.

Like the separator 12 of the first header 4, the separator 22 is inserted into the inside of the tubular body 21 through two slits 25 formed on the side wall of the tubular body 21. The round hole 20 is not formed in the separator 22 used for the second header 5.

The caps 23 are lids attached to both ends of the tubular body 21,
The outflow pipe 24 is inserted through the lower cap 23.

The outflow pipe 24 is a pipe for flowing out the condensed liquefied refrigerant that has passed through the 14 tubes 2, and the liquefied refrigerant that has flowed out of the outflow pipe 24 is passed through a refrigerant pipe (not shown) to a receiver, a decompression device,
Guided to the refrigerant evaporator.

(Operation of Example) Next, the relationship between the flow of the refrigerant in the refrigerant condenser 1 and the dryness will be briefly described with reference to FIG. The solid line A in FIG. 3 is a graph showing the relationship between the dryness and the length of the refrigerant passage from the refrigerant inlet to the refrigerant outlet of the refrigerant condenser 1 of this embodiment.

The high-temperature, high-pressure gas refrigerant discharged from the refrigerant compressor is
It flows into the inlet chamber 16 through the inflow pipe 15 (state where the refrigerant passage length is 0 in FIG. 3).

The gas refrigerant flowing into the inlet chamber 16 and the gas refrigerant flowing into the first going tube 6 pass through the bypass pipe 13 to the second refrigerant.
It is divided into a gas refrigerant flowing into the return chamber 17 and a gas refrigerant flowing into the fourth return chamber 18 via the bypass pipe 13.

The refrigerant introduced from the inlet chamber 16 into the first going tube 6 passes through the first going tube 6, the first return chamber 26, and the first return tube 7 and is introduced to the second return chamber 17. The refrigerant passing through the first going tube 6 and the first returning tube 7 exchanges heat with the air passing through the corrugated fins 3 and is cooled. That is, it is liquefied and condensed, and the dryness is lowered (state of refrigerant passage length 0 to a1 in FIG. 3).

The refrigerant that has passed through the first return tube 7 is mixed with the gas refrigerant supplied by the bypass pipe 13 in the second return chamber 17, and the dryness increases (state of refrigerant passage length a1 in FIG. 3).

The refrigerant in the second return chamber 17 passes through the second going tube 8, the third return chamber 27, and the second return tube 9 and is guided to the fourth return chamber 18. Second going tube 8 and second
The refrigerant passing through the return tube 9 is the corrugated fin 3
The heat is exchanged with the air passing through and is cooled, and the dryness is lowered (state of refrigerant passage lengths a1 to a2 in FIG. 3).

The refrigerant passing through the second return tube 9 is mixed with the gas refrigerant supplied by the bypass pipe 13 in the fourth return chamber 18, and the dryness is increased (state of refrigerant passage length a2 in FIG. 3).

The refrigerant in the fourth return chamber 18 passes through the third going tube 10 and is guided to the outlet chamber 28. The refrigerant passing through the third going tube 10 exchanges heat with the air passing through the corrugated fins 3 and is cooled, so that the dryness is lowered (state of refrigerant passage length a2-1 in FIG. 3).

(Effects of Embodiment) As shown in the graph of FIG. 3, the dryness of the refrigerant increases in the refrigerant passage lengths a1 and a2. Therefore, as indicated by the solid line B in FIG. 4 (graph showing the relationship between the refrigerant passage length and the refrigerant heat transfer coefficient), the refrigerant heat transfer rate increases in the refrigerant path lengths a1 and a2. This means that the average heat transfer coefficient of the refrigerant condenser 1 is improved as compared with the broken line (b). As a result, the refrigerant condensing capacity of the refrigerant condenser 1 is improved.

Further, since the gas refrigerant flowing into the inlet chamber 16 of the refrigerant condenser 1 is distributed to the second return chamber 17 and the fourth return chamber 18 by the bypass pipe 13, the refrigerant flow rate on the inlet side of the refrigerant passage length is small. Become. As a result, as shown by the solid line C in FIG. 5 (a graph showing the relationship between the refrigerant passage length and the internal pressure), the pressure on the inlet side of the refrigerant passage length is larger than that on the refrigerant inlet side as compared with the broken line (c). Pressure loss is reduced. This result also improves the refrigerant condensing capacity of the refrigerant condenser 1.

(Modification) Although the gas refrigerant is bypassed by the bypass pipe in the present embodiment, the gas refrigerant may be bypassed by providing a bypass hole in the separator.

Refrigerant condenser of the present invention, household, industrial cooling device,
It can be used as a refrigerant condenser for various purposes such as a cooling device for automobiles and a cooling device for ships.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of a refrigerant condenser, FIG. 2 is an assembly view of essential parts of the refrigerant condenser, and FIG. 3 is a refrigerant passage length. FIG. 4 is a graph showing the relationship between dryness, FIG. 4 is a graph showing the relationship between the refrigerant passage length and the heat transfer coefficient on the refrigerant side, and FIG. 5 is a graph showing the relationship between the refrigerant passage length and the internal pressure. FIG. 6 is a perspective view of a conventional refrigerant condenser. In the drawing, 1 ... Refrigerant condenser, 2 ... Tube 4 ... First header, 5 ... Second header 13 ... Bypass pipe (bypass means) 16 ... Inlet chamber, 17 ... Second return chamber 18 ... Fourth return chamber

Claims (1)

(57) [Claims] 1. A refrigerant condenser comprising a plurality of tubes and headers connected to both ends of the plurality of tubes, wherein an inlet chamber for guiding inflowing gas refrigerant into the plurality of tubes is provided in the header. And a return chamber that guides the refrigerant that has passed through the tube to another tube, wherein the inlet chamber and the return chamber are connected by bypass means that bypasses the tube.