JPH07174438A - Refrigerant flow divider - Google Patents

Abstract

PURPOSE:To perform a refrigerant split flow optimum to various heat- exchangers by a method wherein the inside diameter ratio between the upper and lower stage pass sides is changed within a specified diameter ratio, the tip part of a branch straight pipe forms a cylindrical nozzle part, and the cylindrical nozzle part is located in a position situated facing the opening part of the branch part of a branch pipe. CONSTITUTION:A refrigerant flow divider has a pipe inside diameter set to a value within a range of 0.66<D2/D1<0.89 when 0 deg.<=theta2<40 deg., where the pipe inside diameter on the upper pass side is D1, the pipe inside diameter on the lower stage pass side is D2, the angle, at which a branch flow pipe is inserted in a heat-exchanger, with the vertical line is theta2. Further, when the angle of a line for interconnecting the centers of the pipe inside diameters D1 and D2 on the upper and lower stage pass sides with the center line of a straight pipe is theta1, the pipe inside diameter is set to a value within a range of 60 deg.<theta1<120 deg.. A cylindrical nozzle part is arranged facing the opening part of the branch part of the branch pipe. This constitution causes a flow of a refrigerant to be branched in optimum to various heat-exchangers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant flow divider for dividing a refrigerant in a refrigerating cycle such as an air conditioner or a refrigerating machine.

[0002]

2. Description of the Related Art In recent years, refrigeration systems for air conditioners have been diversified, and along with this, heat exchangers have multiple circuits due to improved heat transfer efficiency, and the frequency of use of a refrigerant shunt is also increased in order to cope with these various heat exchangers. It is increasing and its importance is increasing.

The above-mentioned conventional example will be described below with reference to FIG. Prior art example The refrigerant distributor 11 of FIG. 7 is composed of a straight pipe 12 for a distribution pipe and a flow dividing part 13 for a flow dividing pipe, and the straight pipe for the flow dividing pipe has a tubular nozzle shape. The jet flow is changed to a right-angled direction and divided into an upper pass side 14 and a lower pass side 15 with respect to the heat exchanger. Further, in the branch pipe dividing portion, the pipe inner diameter on the upper pass side and the pipe inner diameter on the lower pass side have the same shape and have the same inner diameter.

[0004]

In recent years, high performance and low power input have been demanded, and various heat exchangers have been developed accordingly, and in order to exert the maximum heat exchanger capacity in each heat exchanger. There is a need for a technology for diverting the refrigerant at an optimal diversion ratio.

In this refrigerant distributor 11, the inner diameter of the pipe on the upper pass side and the inner diameter of the pipe on the lower pass side have the same shape and the same inner diameter. Therefore, in the case of a heat exchanger having 10 pass stages as shown in FIG. 4, since the flow dividing pipe is provided at the center of the front surface on the right side of the heat exchanger, the refrigerant is optimally divided on the upper pass side and the lower pass side. It is divided by the ratio. However, the number of pass stages is 1 as shown in FIG.
In the case of a two-stage heat exchanger, since the flow dividing pipe is provided on the right front surface of the heat exchanger as shown in FIG. 5,
The refrigerant that has flowed into the straight pipe part of the diversion pipe in the gas-liquid two-phase state during the cooling operation is divided into the upper pass side and the lower pass side by the diversion pipe diversion part. The influence of centrifugal force and gravity due to the flow velocity of the refrigerant. Due to this, a large amount of refrigerant with a high mass flow rate and a large amount of liquid component flows into the lower path side, and the refrigerant distribution ratio between the upper path side and the lower path side is not optimal, and the heat exchanger capacity cannot be maximized. The problem arises.

[0006]

In order to solve the above-mentioned problems, the present invention inserts the pipe inner diameters D1 and D2 of the upper pass side and the lower pass side into the heat exchanger of the vertical line and the flow dividing pipe in the flow dividing pipe dividing portion. When the angle to be made at the time is set to θ2, the pipe inner diameter is changed according to the angle of θ2 to divide the refrigerant so that the various heat exchangers are made to perform the optimum refrigerant distribution.

[0007]

With the development of various high-performance heat exchangers having the above-described structure, the present invention can be used in various ways even if the number of pass stages of the heat exchanger, the length of the heat exchanger, and the heat exchanger angle are varied. By changing the inner diameter ratio of the inner diameters of the upper pass side and the lower pass side in the diversion pipe diversion section according to the specifications, the refrigerant is diverted so that the maximum heat exchanger capacity can be exerted in various heat exchangers. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An evaporator equipped with a refrigerant distributor according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 6, the shape and configuration of a refrigerant flow divider according to an embodiment of the present invention will be described. First, FIG. 6 shows the configuration of an air conditioner that is also used as a cooling and heating system and is connected with a refrigerant flow divider. 7
Reference numeral 1 denotes a compressor, in which a four-way valve 72, an outdoor heat exchanger 73, a pressure reducer 74, and an indoor heat exchanger 75 are annularly connected as a refrigeration cycle, and a refrigerant shunt 76 is provided between the pressure reducer 74 and the indoor heat exchanger 75. The air conditioner for both air conditioning and heating is constructed by connecting.

Next, the structure of the refrigerant flow divider will be described with reference to FIGS. 1 and 2. FIG. 1 shows a refrigerant shunt in which the inner diameter of the lower-pass side is narrowed to make it a compressed tube so that a refrigerant having a large mass flow ratio and having a large amount of liquid components does not easily flow to the lower-pass side. Assuming that D1 is the inner diameter of the pipe on the lower pass side and D2 is the angle between the vertical line and the diversion pipe inserted into the heat exchanger as shown in FIG. 5, θ2 is 0 ° ≦ θ
In the case of 2 <40 °, if the inner diameter of the pipe is designed within the range of 0.66 <D2 / D1 <0.89, there are many liquid components on the lower pass side under the influence of centrifugal force and gravity due to the flow velocity of the refrigerant. It is possible to prevent the refrigerant from flowing in, and it is possible to optimally divide the refrigerant into the upper path side and the lower path side.

When 40 ° ≦ θ2, 0.66 <D2 /
Even if the inner diameter of the pipe is designed within the range of D1 <0.89, if the refrigerant with a large amount of liquid component still flows into the lower pass side, the center of the inner diameter of the upper and lower pass sides is connected as shown in FIG. If the angle between the line and the center line of the straight pipe is θ1, then 60 <θ1 <
When θ1 is designed within the range of 120 °, the refrigerant can be optimally divided into the upper pass side and the lower pass side. As an example, when θ2 = 50 °, D2 / D1 = 0.735
Even if it is designed with, the upper-pass-side refrigerant flow rate: the lower-pass-side refrigerant flow rate = 45:55, so a large amount of refrigerant flows into the lower-pass side, so it was designed to θ1 = 100 °, and due to the centrifugal force due to the flow velocity of the refrigerant, the upper-pass side would A large amount of refrigerant is poured in to achieve the optimum refrigerant splitting.

Further, FIG. 2 shows the structure of the contraction pipe portion in the refrigerant flow divider, and 31 is a stopper provided in the flow dividing pipe of the flow dividing portion, and this stopper prevents the flow dividing pipe from being connected to the heat exchanger. The insertion allowance is regulated to prevent variations when the diversion pipe is inserted into the heat exchanger. Reference numeral 32 is an orifice provided in the inner diameter of the diversion pipe on the side of the contraction pipe, which reduces the inner diameter of the pipe on the side of the lower path and at the same time prevents the refrigerant noise and the vibration of the diversion pipe during normal operation. is doing.

[0013]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in various heat exchangers, the pipe inner diameter ratio of the diversion pipe of the refrigerant diversion device and the angle formed by the diversion pipe diversion portion and the straight pipe are changed according to the heat exchanger. Thus, there is an effect that the refrigerant can be optimally diverted to the heat exchangers of various specifications.

Further, since there is a restriction when inserting the refrigerant distributor into the heat exchanger, there is an effect of preventing variations in manufacturing.

[Brief description of drawings]

FIG. 1 is a front sectional view of a refrigerant flow divider according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 (a) is a side view of a heat exchanger to which the refrigerant flow divider is connected, and FIG. 3 (b) is a perspective view of the heat exchanger.

FIG. 4A is a side view of a heat exchanger to which the refrigerant flow divider is connected, and FIG. 4B is a perspective view of the heat exchanger.

FIG. 5 is a side view of a heat exchanger to which the refrigerant flow divider is connected.

FIG. 6 is a refrigeration cycle diagram of an air conditioner to which the refrigerant flow divider is connected.

FIG. 7A is a perspective view of a conventional refrigerant flow divider, and FIG. 7B is a front sectional view of the same.

[Explanation of symbols]

11 Refrigerant flow diverter of the conventional example 12 Straight pipe part of the diversion pipe 13 Dividing pipe part of the diversion pipe 14 Inner diameter of the upper pass side pipe 15 Inner diameter of the lower pass side D1 Upper inner diameter of the pass side D2 Lower inner diameter of the pass side θ1 Upper and lower inner diameter of the pass side pipe Angle formed by the line connecting the centers of the straight pipe and the center line of the straight pipe 31 Stopper 32 Orifice θ2 The angle formed between the perpendicular line and the diversion pipe when it is inserted into the heat exchanger 71 Compressor 72 Four-way valve 73 Outdoor heat exchanger 74 Pressure reducer 75 Indoor heat exchanger 76 Refrigerant flow divider

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sadami Masahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Yoshiaki Uchida 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. In the company

Claims (6)

[Claims] 1. A flow dividing portion comprising a straight pipe and a flow dividing pipe dividing portion, and the flow dividing pipe is provided at a refrigerant inlet portion of an evaporator (heat exchanger), and the flow dividing pipe dividing portion is provided in a heat exchanger. It has the feature that the ratio of the inner diameter ratio of the upper pass side and the lower pass side is changed within a certain diameter ratio so that the optimal refrigerant distribution is achieved according to the shape. Part, and the cylindrical nozzle part is located at a position facing the opening of the flow dividing pipe diversion part. 2. In the branch pipe branching portion, if the inner diameter on the upper pass side is D1 and the inner diameter on the lower pass side is D2, then 0.66 <
The refrigerant shunt according to claim 1, wherein D2 / D1 <0.89. 3. In the flow dividing portion of the flow dividing pipe, when the angle formed by the line connecting the centers of the inner diameters of the upper and lower paths and the center line of the straight pipe of the flow dividing pipe is θ1, 60 ° <θ1 <120 °. Item 2. The refrigerant flow divider according to item 1. 4. The refrigerant shunt according to claim 1, wherein a stopper is provided at an insertion portion of the diverter pipe in the heat exchanger on the upper and lower path sides to restrict an insertion allowance of the diverter pipe to the heat exchanger. . 5. A feature of preventing the noise of the refrigerant and the vibration of the diverter pipe during normal operation by inserting an orifice into the inside of the diverter pipe in the diverter part of the diverter pipe at the upper and lower pass sides. The refrigerant flow divider according to claim 1, further comprising: 6. A compressor, a four-way valve, an indoor heat exchanger, a pressure reducer,
An air conditioner configured by connecting an outdoor heat exchanger in a ring as a refrigeration cycle, and connecting the refrigerant flow divider according to claim 1 between a pressure reducer and an indoor heat exchanger that functions as an evaporator in the heat exchanger. Combined air conditioner.