JPH1130495A - Integrated piping device for refrigerating cycle and air conditioner having integrated piping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and to properly distribute a refrigerant, by a method wherein a plate having a groove in which a refrigerant flows and a hole having a central part in which a refrigerant flows are formed, a refrigerant distributing plate having grooves radially running from this hole is arranged, and the refrigerant distributing plate nipped between plates is integrally fixed. SOLUTION: An integrated piping device distributes a refrigerant in a given ratio to a plurality of the refrigerant flow passages of a heat exchanger. Grooves 24a forming flow passages for distributed refrigerants, a groove 24b forming a header to join together refrigerants discharged from heat exchangers, a hole 24c to connect an inflow pipe 25 for a refrigerant, and a hole to connect an outflow pipe 26 for a refrigerant are formed in a plate 24. A hole 27a communicated with a hole 24c and in which a refrigerant flows, a plurality of grooves 27b radially extending from the hole 27a in a manner to be communicated with the ends on one side of the grooves 24a, and a plurality of notches 27c for positioning on an outer periphery are formed in a refrigerant distributing plate 27. The width of the groove 27b is set based on (a), a flow rate regulating part 27d is formed according to the distribution ratio of a refrigerant, and the sizes thereof are set to (b), (c), and (d).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated piping device used in a refrigeration cycle such as an air conditioner and an air conditioner using the same.

[0002]

2. Description of the Related Art In heat exchangers such as refrigerators and air conditioners, measures such as reducing the diameter of heat transfer tubes and adopting a gas-liquid two-phase refrigerant have been taken in order to reduce the size and weight and reduce the amount of refrigerant used. Is being done. At the same time as these countermeasures, while reducing the flow resistance of the refrigerant flowing through the heat transfer tube having a reduced diameter, and for the purpose of improving the heat exchange efficiency, the flow path of the refrigerant in the heat exchanger is divided into a plurality of flow paths. It has been proposed to supply an appropriate amount of refrigerant to the flow path.

As shown in FIG. 7, for example, this heat exchanger has first heat transfer tubes 12a... 12d penetrating through fins 11 arranged at predetermined intervals and connected by a vent tube 12e.
Heat transfer tubes 13a penetrating the fins 11
A second refrigerant flow passage 13d connected by a vent pipe 13e, a third refrigerant flow passage connected to the heat transfer tubes 14a...
The heat transfer tubes 15a.
e) and a fourth refrigerant flow path connected by e.

[0004] Each of the refrigerant passages is provided with a heat transfer tube 12a, 1
The refrigerant flowing from the heat transfer tubes 12a, 3a, 14a, 15a
While flowing out of d, 13d, 14d, and 15d, heat exchange is performed with the air flowing between the fins 11.

At this time, the air flowing into the heat exchanger 1 includes:
The heat exchanger 1 usually has a non-uniform flow velocity distribution on the front surface thereof due to the characteristics of the blower, the air flow path resistance, and the like. Therefore, when the two-phase refrigerant having the same gas-liquid ratio is evenly distributed to each refrigerant flow path, heat exchange between the refrigerant and the air is sufficiently performed in the region where the air having the high flow velocity flows, and the liquid refrigerant is discharged. Completely evaporates and becomes overheated gas state, heat exchanger 1
Outflow. On the other hand, in a region where air having a low flow velocity flows, heat exchange between the refrigerant and the air becomes insufficient, and the refrigerant flows out of the heat exchanger 1 in a state where the liquid refrigerant remains.

As described above, when the refrigerant flowing out of the heat exchanger is in an unbalanced state, the performance as the heat exchanger is not sufficiently exhibited. Therefore, in order to sufficiently exhibit the performance of the heat exchanger, it is necessary to flow an amount of refrigerant corresponding to the amount of air flowing through each region in each refrigerant channel.

In order to cope with such a problem, for example, a refrigerant flow divider disclosed in Japanese Patent Application Laid-Open No. 8-86538 has been proposed. As shown in FIG. 8, the refrigerant flow divider 3 is formed by brazing a pair of plates 4, 4 on which concaves and convexes (grooves) forming the refrigerant flow path 5 and the flow distribution chamber 6 are formed. Then, the refrigerant connected to the heat exchanger 1 via the pipe 2 and supplied to the inlet pipe section 7 via the pipe 8 is divided into two and supplied to each refrigerant flow path of the heat exchanger 1. It has become.

The amount of the refrigerant supplied to each refrigerant flow path of the heat exchanger 1 is adjusted as shown in FIG.
Or by forming an enlarged diameter portion and mounting an orifice.

[0009]

In such a refrigerant flow divider, the structure of the heat exchanger (the number of divided refrigerant passages, the distribution ratio of the refrigerant, the characteristics of the blower, the resistance of the air passage, etc.) changes. In addition, the plate and orifice must be remade,
When manufacturing a plurality of types of heat exchangers, their management becomes complicated.

[0010] In view of the above circumstances, an object of the present invention is to provide an integrated piping device for a refrigeration cycle and an air conditioner using the same, which can simplify the configuration and optimize the distribution of the refrigerant. is there.

[0011]

In order to achieve the above object, a first invention of the present application is directed to a method of forming a header, comprising: a plurality of grooves for forming a refrigerant flow passage; A formed plate, a plurality of grooves, one end of which faces the inflow portion, and a plurality of grooves serving as a refrigerant flow path having the other end serving as a pipe connection portion; a plate formed with a groove into which a refrigerant flows, and an inflow portion of the refrigerant And a refrigerant distribution plate in which a plurality of radial grooves are formed at the center of the hole, into which a refrigerant flows, and a plurality of radial grooves facing one end of the plurality of grooves forming the refrigerant flow path from the hole. , A refrigerant distribution plate is sandwiched between the plates to be integrally fixed.

According to a second aspect of the present invention, there is provided a refrigerant distribution plate in which the width of a radially formed groove is set in accordance with the distribution ratio of the refrigerant required in the heat exchanger.

According to a third aspect of the present invention, there is provided an integrated piping device for a refrigeration cycle according to the first and second aspects, and a compressor and a heat exchanger are connected via the integrated piping device.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an air conditioner according to the present invention. In FIG. 1, reference numeral 1 denotes a heat exchanger having a plurality of divided refrigerant channels. 21 is a compressor,
Performs compression of the refrigerant. Reference numeral 22 denotes a four-way valve which is connected to the compressor 21 and switches the flow direction of the refrigerant. An outdoor heat exchanger 23 is connected to the compressor 21 via a four-way valve 22. Reference numeral 24 denotes an integrated piping device, which is connected to each refrigerant flow path of the heat exchanger 1 and the outdoor heat exchanger 23 and the four-way valve 22. A strainer 25 is connected between the compressor 21 and the four-way valve 22.

In such a configuration, for example, during a cooling operation, the high-temperature and high-pressure gas refrigerant compressed by the compressor 21 is sent from the four-way valve 22 to the outdoor heat exchanger 23,
The heat is exchanged with the outside air at 3 and becomes a low-temperature and high-pressure liquid refrigerant, which is sent to the integrated piping device 24. Heat exchanger 1 in integrated piping device 24
Of the heat exchanger 1
The refrigerant circulates through the inside, becomes a low-temperature and low-pressure gas refrigerant by heat exchange with room air, returns to the integrated piping device 24, merges again, and is sucked from the four-way valve 22 through the strainer 25 to the compressor 21.

FIG. 2 is an exploded perspective view of the integrated piping device.
FIG. 3 is an enlarged view of the refrigerant distribution plate in FIG. 2, and FIG. 4 is a sectional view taken along line BB of FIG.

In FIG. 1, reference numeral 24 denotes a plate, which connects a groove 24a serving as a flow path for the divided refrigerant, a groove 24b serving as a header for joining the refrigerant discharged from the heat exchanger, and an inlet pipe 25 for the refrigerant. Hole 24c and a hole (not shown) for connecting the outflow pipe 26 of the refrigerant.

Reference numeral 27 denotes a refrigerant distribution plate, as shown in FIG.
A hole 27a that communicates with the hole 24c and into which the refrigerant flows, a plurality of grooves 27b extending radially from the hole 27a so as to communicate with one end of the groove 24a, and a plurality of notches 27c for positioning are formed on the outer periphery. Have been. The width of the groove 27b is based on a, and a flow rate adjusting portion 27d is formed in accordance with the refrigerant flow ratio, and the dimensions thereof are formed as b, c, and d. The length of the flow rate adjusting section is e (for example, 2 m
m).

Reference numeral 28 denotes a plate. A groove 28a in which the refrigerant distribution plate 27 is fitted, a groove 28b facing the groove 24a and serving as a flow path for the divided refrigerant, and a groove 28b facing the groove 24b to exchange heat. 2 serving as a header for joining the refrigerant discharged from the vessel
8c and a hole 28d for connecting a pipe 29 for connecting to a heat exchanger are formed.

Reference numeral 30 denotes a brazing material, which is disposed between the plate 24 and the refrigerant distribution plates 27 and 28. Reference numeral 31 denotes a brazing material, which is disposed between the refrigerant distribution plates 27 and 28.

With such a configuration, the refrigerant inflow pipe 25 is
And a pipe 29 in which an outlet pipe 26 and an outflow pipe 26 are joined by brazing.
, A refrigerant distribution plate 27 and brazing materials 30 and 31 are overlapped in a predetermined order, and put in a heating furnace to heat and join.

In the integrated piping device formed in this manner, for example, as shown in FIG. 3, the flow rate of the refrigerant flowing through some of the eight branches is reduced by the flow rate of the refrigerant flowing through the other paths. When the flow rate is 1, 0.81, 0.6
When the width is set to 8, 0.38, the width of the other groove 27b is 3.7 mm, and the width of the flow rate adjusting portion 27d of the groove 27b for reducing the flow rate of the refrigerant is 3.0 mm, 2.5 m, respectively.
m and 1.4 mm.

That is, the flow rate adjusting portion 27d of the groove 27b
Of the refrigerant can be set in proportion to the width of the refrigerant.

FIG. 5 shows another embodiment of the refrigerant distribution plate according to the present invention. In the drawing, reference numeral 32 denotes a refrigerant distribution plate, which communicates with the hole 24c, and a hole 32a into which the refrigerant flows.
And a plurality of grooves 32b extending radially from the hole 32a so as to communicate with one end of the groove 24a, and a projection (or recess) 32c for positioning. The groove 3
The width of 2b is based on a, and the flow rate adjusting portion 32d is formed in accordance with the flow ratio of the refrigerant, and its size is formed as b, c, d. Note that the length of the flow rate adjusting section is e (for example, 5 mm). 32e is a sealing piece which is arranged in the groove 32b and seals the flow of the refrigerant.

As shown in the drawing, of the eight grooves 32b of the refrigerant distribution plate 32 formed for eight branches, sealing pieces 32e are arranged in three of the grooves 32b by brazing, and the five branches are integrated. It can be a piping device. In addition, the flow rate of the refrigerant for each branch is determined by the widths a, b,
By setting c and d, it can be set arbitrarily.

FIG. 6 is a characteristic diagram showing the flow dividing performance of the integrated piping device according to the present invention. In this figure, the dryness of the refrigerant in each of the flow paths after the split is xi, the average dryness after the split is xm, the number of splits is N, and the dryness deviation σ is calculated by Equation 1.

[0027]

(Equation 1)

As shown in FIG. 6, regardless of the number of branches, as the refrigerant mass flow rate G increases, the dryness deviation σ of the refrigerant tends to decrease. Therefore, for example, as shown in FIG. 3, a part of the groove of the refrigerant distribution plate 27 for eight branches is
Even if it is used as the refrigerant distribution plate 32 for five branches by sealing with the sealing piece 32e shown in FIG.

Therefore, various air conditioners can be accommodated only by changing the shape of the refrigerant distribution plate 27 (32) without changing the shape of the plate constituting the integrated piping device.

[0030]

As described above, according to the present invention, at least a plate having a refrigerant inflow portion and a bulging portion forming a header portion is formed, and at least one end is opposed to the inflow portion. A plate on which a plurality of bulging portions forming a refrigerant flow path having an end as a pipe connection portion is fitted to an inlet portion of the refrigerant,
A hole is formed at the center of the coolant, and a coolant distribution plate is provided with a plurality of radial grooves facing one end of the plurality of bulging portions forming the coolant flow path from the hole. Since the refrigerant distribution plate is interposed and fixed integrally, the number of refrigerant distributions can be arbitrarily set by the refrigerant distribution plate,
Even if the number of shunts is changed, stable shunt performance can be exhibited. Further, it is possible to cope with various air conditioners simply by changing the shape of the refrigerant distribution plate without changing the shape of the plate constituting the integrated piping device.

Further, since the width of the radially formed grooves is set in the refrigerant distribution plate according to the distribution ratio of the refrigerant required in the heat exchanger, the distribution ratio of the refrigerant is arbitrarily set. be able to.

Further, since the change of the integrated piping device can be dealt with by the necessary minimum change of only the refrigerant distribution plate, the equipment, power and resources required for industrial use can be saved, and the air conditioner can be saved. Cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an air conditioner according to the present invention.

FIG. 2 is an exploded perspective view of the integrated piping device.

FIG. 3 is an enlarged view of a refrigerant distribution plate in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is an enlarged view showing another embodiment of the refrigerant distribution plate.

FIG. 6 is a characteristic diagram showing a flow dividing performance of the integrated piping device according to the present invention.

FIG. 7 is a perspective view of a heat exchanger in a refrigeration cycle.

FIG. 8 is a perspective view of a conventional integrated piping device.

[Explanation of symbols]

1: heat exchanger, 24: plate, 24a, 24b: groove, 24c
... holes, 27 ... refrigerant distribution plate, 27a ... holes, 27b ... grooves, 2
7d: flow rate adjusting unit, 28: plate, 28a, 28b, 28c
... holes, 28d ... holes.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yasuda 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Air Conditioning Systems Division, Hitachi, Ltd.

Claims (3)

[Claims] 1. A plate in which a coolant inflow hole, a plurality of grooves serving as a coolant flow path, and a groove forming a header portion are formed, and one end is opposed to the inflow portion, and the other end is connected to a pipe connection portion. A plurality of grooves serving as refrigerant channels to be formed, a plate formed with grooves into which the refrigerant flows, and a hole that fits into the inflow portion of the refrigerant, and a hole through which the refrigerant flows is formed at the center. A refrigerant distribution plate having a plurality of radial grooves opposed to one end of the plurality of grooves constituting the flow path; and a refrigerant distribution plate sandwiched between the plates to be integrally fixed. Integrated refrigeration cycle piping system. 2. The refrigeration cycle according to claim 1, wherein the refrigerant distribution plate has a width of grooves formed radially in accordance with a distribution ratio of the refrigerant required in the heat exchanger. Integrated piping equipment. 3. The heat exchanger according to claim 1 or claim 2.
An air conditioner comprising the integrated piping device for a refrigeration cycle according to item 1.