JPH07269992A - Receiver tank for heat pump - Google Patents

Abstract

PURPOSE:To improve a gas-liquid separating function by a method wherein a structure of a bidirectimal refrigerant receiver tank is improved, its structure is simple and a mixing of refrigerant gas flowing from an inlet side pipe (a second flowing-in flowing-out pipe 10) to an outlet pipe (a first flowing-in flowing-out pipe 9) is prevented. CONSTITUTION:A first flowing-in flowing-out pipe 9 and a second flowing-in flowing-out pipe 10 are fed into a receive tank main body 11 from its lower side. Each of opening ends 9A and 10A of the flowing-in flowing-out pipes 9 and 10 is positioned above a liquid surface of inner refrigerant C and at the same time flowing-out openings 21 and 22 are formed at each of the locations where they are immersed in the refrigerant C while their relative opening directions are made different from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver tank for a heat pump system, and more particularly to a receiver tank for a heat pump system having a bidirectional refrigerant receiver structure and an improved gas-liquid separation function. is there.

[0002]

2. Description of the Related Art A conventional heat pump system and its receiver tank will be outlined with reference to FIGS. FIG. 6 is a schematic view of a conventional general heat pump system 1.
Includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, and a first
Expansion valve 5, a receiver tank (refrigerant liquid receiver or liquid tank) 6, a second expansion valve 7, an indoor heat exchanger 8, and a refrigerant pipe connecting these in an annular shape (particularly connected to the receiver tank 6). The first inflow / outflow pipe 9 between the outdoor heat exchanger 4 and the second inflow / outflow pipe 10) between the indoor heat exchanger 8).

FIG. 7 is a schematic cross-sectional view of the receiver tank 6. The receiver tank 6 has a receiver tank main body 11 and functions as either the inlet side pipe or the outlet side pipe. The inflow / outflow pipe 9 and the second inflow / outflow pipe 10 are connected from above,
The refrigerant C can be contained in the inside thereof and can be separated into a liquid layer L and a gas layer G.

The first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 have open end portions 9A and 10A, respectively.
A is exposed in the liquid layer L. In addition, these opening end portions 9A
And 10A facilitates gas-liquid separation by cutting this diagonally.

In the heat pump system 1, the four-way valve 3 is switched so that the refrigerant C circulates in the direction shown by the dotted line in FIG. 6 during the cooling operation. Outdoor heat exchanger 4
Functions as a condenser and radiates heat by changing the vapor phase refrigerant C into a liquid phase. The first expansion valve 5 does not reduce the pressure in this flow direction of the refrigerant C, and the refrigerant C in the gas-liquid mixed state reaches the receiver tank 6, and from the opening end 9A of the first inflow / outflow pipe 9 to the receiver tank main body 11 Flows into the inside of the chamber, releases gas to the liquid layer L and the gas layer G, and
And the gas layer G is separated.

The open end 10 of the second inflow / outflow pipe 10.
Refrigerant C in a liquid phase flowing out of the receiver tank 6 from A
Is decompressed in the second expansion valve 7 and absorbed in the indoor heat exchanger 8 functioning as an evaporator by being in a gas phase.

During the heating operation, the four-way valve 3 is switched so as to circulate the refrigerant C in the direction shown by the solid line in FIG. The outdoor heat exchanger 4 functions as an evaporator and absorbs heat by turning the liquid phase refrigerant C into a gas phase. Refrigerant C is a four-way valve 3
And is compressed by the compressor 2. The indoor heat exchanger 8 functions as a condenser, and radiates heat by turning the vapor-phase refrigerant C into a liquid phase. The second expansion valve 7 does not reduce the pressure in this flow direction of the refrigerant C, and the refrigerant C in the gas-liquid mixed state reaches the receiver tank 6 and the opening end 10A of the second inflow / outflow pipe 10 to the receiver tank main body 11 Flowing in,
The gas is released into the liquid layer L and the gas layer G, and is separated into the liquid layer L and the gas layer G.

The liquid state refrigerant C flowing out of the receiver tank 6 from the opening end 9A of the first inflow / outflow pipe 9 is decompressed in the first expansion valve 5 and reaches the outdoor heat exchanger 4.

When such a receiver tank 6 is used, the receiver tank 6 vaporizes the refrigerant C condensed by the condenser (the outdoor heat exchanger 4 during the cooling operation or the indoor heat exchanger 8 during the heating operation). It has a function of separating the liquid and removing water and impurities, and sending only the liquid phase refrigerant C to the expansion valve (the first expansion valve 5 or the second expansion valve 7) to form a stable heat pump cycle. ing.

In the heat pump system 1, however, the four-way valve 3 is switched to cool and heat the room. Therefore, in the receiver tank 6, the direction of the flow of the refrigerant C during the cooling operation and the heating operation ( The entrances and exits are different and are required to have so-called interactivity.

In the receiver tank 6 shown in FIG. 7, when the condensed refrigerant C is in a gas-liquid mixed state, all the refrigerant C on the inlet side (for example, the opening end 9A) flows into the liquid layer L, and the refrigerant C in the liquid layer L. There is a problem that the gas swirls and mixes into the outlet side (for example, the opening end portion 10A) before the gas is completely separated.

In order to solve the problem of the deterioration of the gas-liquid separation function, the intermediate plate 12 shown by the phantom line in FIG.
A means for preventing the swirling of the refrigerant gas between the first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 may be adopted, but there is a problem in that it is not sufficiently effective. .

As a refrigerating cycle using a one-way receiver tank, there is Japanese Utility Model Publication No. 61-41006.
As a heat pump system using a bidirectional receiver tank, there is Jikoku Sho 63-2858. In Japanese Utility Model Publication No. 63-2858, one of the inflow and outflow pipes (the first refrigerant pipe 12 and the second refrigerant pipe 13) has its open end facing the liquid layer of the refrigerant. The problem of the mixing of the refrigerant gas into the outlet side pipe is less than that of the conventional receiver tank 6 of FIG. 7, but it is not completely solved.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to improve the structure of a bidirectional refrigerant receiver tank in a heat pump system.

Further, the present invention provides a receiver tank for a heat pump system having a simple structure and having an improved gas-liquid separation function by preventing the mixture of the refrigerant gas from the inlet side pipe to the outlet side pipe. Is an issue.

[0016]

That is, according to the present invention, a first inflow / outflow pipe and a second inflow / outflow pipe to be an inlet side pipe or an outlet side pipe are made to face the inside of a receiver tank body from below. I focused on
A compressor for the refrigerant, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger, which is arranged between the outdoor heat exchanger and the indoor heat exchanger of a heat pump system having a receiver tank body, A receiver tank for a heat pump system, comprising a first inflow / outflow pipe connected to the outdoor heat exchanger and a second inflow / outflow pipe connected to the indoor heat exchanger, the first inflow / outflow pipe And the second inflow / outflow pipe are introduced into the receiver tank body from below, and the opening end portions of the first and second inflow / outflow pipes are respectively located above the refrigerant liquid level in the interior. And the first and second
Is a receiver tank for a heat pump system, characterized in that the inflow / outflow pipes are formed in the portions soaked in the refrigerant by forming outflow openings in different opening directions.

The first and second inflow / outflow pipes are
They can be arranged vertically so that they are parallel to each other.

The first and second inflow / outflow pipes are
The opening direction of the outflow opening can be different by 180 degrees.

The opening area of the outflow opening is equal to that of the first opening.
The opening area of the second inflow / outflow pipe is smaller than the opening area of the second inflow / outflow pipe.

Refrigerant outflow suppressing means may be provided in the outflow openings of the first and second inflow / outflow pipes, respectively.

The refrigerant outflow suppressing means uses the first refrigerant
Further, it may be an inwardly bent piece of the second inflow / outflow pipe, or a suppression valve provided in the outflow opening.

[0022]

In the receiver tank for a heat pump system according to the present invention, both the first inflow / outflow pipe and the second inflow / outflow pipe are introduced into the inside of the receiver tank from below, and the first and second inflow / outflow pipes are introduced. Since the open end portions of the pipes are respectively positioned above the liquid surface of the refrigerant inside the pipe, most of the refrigerant will be discharged even if either the first inflow / outflow pipe or the second inflow / outflow pipe becomes the inlet side pipe. First, it goes out to the gas layer part in the receiver tank body and then moves to the liquid layer part, and gas-liquid separation is performed.Therefore, gas should be mixed from the inlet side pipe to the outlet side pipe before gas-liquid separation is performed. It can be prevented.

Further, since the first and second inflow / outflow pipes are provided with the outflow openings at the portions immersed in the refrigerant, the refrigerant can flow out from the outflow openings, and functions as an outlet side pipe. Can also maintain this.

Further, the outflow openings of the first and second inflow / outflow pipes are provided with refrigerant outflow restraint means such as bent pieces or restraint valves, respectively, so that the inside of the receiver tank body passes through these outflow openings. The amount of refrigerant flowing in can be reduced as much as possible.

Further, the outflow openings of the first and second inflow / outflow pipes may be opened in a maximum of 180 degrees, for example.
By forming the opening area of the outflow opening smaller than the opening areas of the opening end portions of the first and second inflow / outflow pipes.
It is possible to prevent the refrigerant in the gas-liquid mixed state from entering the outlet side pipe from the inlet side pipe as much as possible.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A receiver tank 20 for a heat pump system according to a first embodiment of the present invention will be described with reference to FIG. However, the same parts as those in FIGS. 6 and 7 are designated by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 1 is a schematic cross-sectional view of a receiver tank 20 for a heat pump system, in which both the first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 are directed from below the receiver tank body 11 to above. And it is exposed to the inside.

In particular, as shown in the drawing, the first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 are parallel to each other and are vertically erected, and the open end portions 9A cut in parallel and The open end 10A is located in the gas layer G in the receiver tank body 11.

The first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 are located at positions in the liquid layer L, back to back, that is, a maximum of 180 opening directions.
The outflow openings 21 and 22 are formed laterally (horizontally) at different degrees.

The opening area of the outflow openings 21 and 22 can be designed arbitrarily, but it is desirable to make it smaller than that of the opening end 9A and the opening end 10A.

Further, regarding the opening shapes of the outflow openings 21 and 22, the receiver tank main body 11 is viewed from the inlet pipe side.
The refrigerant C in a gas-liquid mixed state that flows into the inside does not leak,
In order to exert the necessary function of allowing the refrigerant C after gas-liquid separation to flow out from the outlet side pipe,
The horizontal direction shown in the drawing, which is perpendicular to the flow direction of the refrigerant C, is the simplest, but it is also possible to open it obliquely from below to above.

FIG. 1 illustrates the heat pump system during heating operation. At this time, in the first inflow / outflow pipe 9 serving as the outlet side pipe, the liquid level inside the receiver tank body 11 and the outlet side pipe ( The liquid level in the first inflow / outflow pipe 9) is constantly the same, and the refrigerant C gas is not mixed from above the first inflow / outflow pipe 9 so that only the liquid phase refrigerant C can be sent. It has become.

In the receiver tank 20 for a heat pump system having such a structure, most of the condensed refrigerant C is the first inflow / outflow pipe 9 or the second inflow / outflow pipe 1.
Even if the refrigerant C is in a gas-liquid mixed state, it is included in the gas layer G after it first flows into the gas layer G from the opening end 9A or the opening end 10A above 0. The gas is contained in the gas layer G without swirling in the liquid layer L.

In the case shown in FIG. 1, part of the refrigerant C flowing in from the second inflow / outflow pipe 10 is part of the outflow opening 2.
2 flows into the liquid layer L, but the amount is small,
The phenomenon that the refrigerant gas swirls in the liquid layer L as in the conventional case is small, and the mixture of the refrigerant gas into the opening end portion 9A of the outlet side pipe can be reduced.

FIG. 2 is a schematic sectional view of a receiver tank 30 for a heat pump system according to the second embodiment of the present invention. The receiver tank 3 for the heat pump system is shown in FIG.
In No. 0, the first inflow / outflow pipe 9 and the second inflow / outflow pipe 10 are provided with a plurality of outflow openings 21 and 22 to improve the flow of the refrigerant C into the outlet side pipe.

3 is a sectional view of a modification of the first inflow / outflow pipe 9 or the second inflow / outflow pipe 10, FIG.
FIG. 3 is a perspective view thereof, and by forming a bent piece 31 which is formed by bending or folding the wall surface of the pipe as a refrigerant outflow suppressing means in a portion corresponding to the outflow openings 21 and 22, the outflow opening is provided above the bent piece 31. By forming the portion 32, the amount of the condensed refrigerant C from the inlet side pipe flowing out from the outflow opening portion 32 is further reduced, and the gas swirling phenomenon in the liquid is further reduced.

FIG. 5 is a cross-sectional view of another modification of the first inflow / outflow pipe 9 or the second inflow / outflow pipe 10, in which the suppression valve 3 is provided inside the outflow openings 21 and 22.
3 has the same function as that of FIGS. 3 and 4, but the opening area thereof can be automatically adjusted as appropriate in accordance with the flow rate of the refrigerant C flowing.

[0038]

As described above, according to the present invention, both the first inflow / outflow pipe and the second inflow / outflow pipe which are the inlet side pipe or the outlet side pipe are made to face from below the receiver tank body. Therefore, a receiver tank having an excellent gas-liquid separation function, a simple structure without cutting the opening end of the pipe obliquely and an intermediate plate is required, and a reliable receiver tank can be obtained.

[0039]

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a receiver tank 20 for a heat pump system according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a receiver tank 30 for a heat pump system according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a modification of the first inflow / outflow pipe 9 or the second inflow / outflow pipe 10 of the same.

FIG. 4 is a perspective view of the same.

FIG. 5 is a sectional view of another modified example of the first inflow / outflow pipe 9 or the second inflow / outflow pipe 10 of the same.

FIG. 6 is a schematic view of a conventional general heat pump system 1.

FIG. 7 is a schematic sectional view of the receiver tank 6 of the same.

[Explanation of symbols]

1 heat pump system 2 compressor 3 four-way valve 4 outdoor heat exchanger (condenser or evaporator) 5 first expansion valve 6 receiver tank (refrigerant receiver or liquid tank) 7 second expansion valve 8 indoor heat exchanger (evaporator) Or condenser) 9 1st inflow / outflow pipe (inlet side pipe or outlet side pipe) 9A 1st inflow / outflow pipe 9 opening end 10 2nd inflow / outflow pipe (outlet side pipe or inlet side pipe) 10A 2nd Inflow / outflow end of the pipe 10 11 Receiver tank main body 12 Intermediate plate 20 Heat pump system receiver tank 21 Outflow opening 22 Outflow opening 30 Heat pump system receiver tank 31 Bent piece 32 Outflow opening 33 Suppression valve C Refrigerant G Gas layer L Liquid layer

Claims (7)

[Claims] 1. A heat pump system having a refrigerant compressor, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger, the heat pump system being arranged between the outdoor heat exchanger and the indoor heat exchanger, and The receiver tank body is provided with a first unit between the outdoor heat exchanger and the first unit.
Second between the inflow and outflow pipes of the room and the indoor heat exchanger
A receiver tank for a heat pump system, wherein the first inflow / outflow pipe and the second inflow / outflow pipe are both introduced from below the receiver tank body into the inside thereof, The opening end portions of the second inflow / outflow pipes are respectively positioned above the refrigerant liquid level inside the second inflow / outflow pipes, and the outflow opening portions are provided at the portions where the first and second inflow / outflow pipes are immersed in the refrigerant. A receiver tank for a heat pump system, characterized in that the opening directions thereof are different from each other. 2. The receiver tank for a heat pump system according to claim 1, wherein the first and second inflow / outflow pipes are vertically arranged so as to be parallel to each other. 3. The receiver tank for a heat pump system according to claim 1, wherein the first and second inflow / outflow pipes differ in opening directions of the outflow openings by 180 degrees. 4. The heat pump system according to claim 1, wherein the opening area of the outflow opening is smaller than the opening areas of the open end portions of the first and second inflow / outflow pipes. Receiver tank. 5. The receiver tank for a heat pump system according to claim 1, wherein the outflow openings of the first and second inflow / outflow pipes are provided with refrigerant outflow suppression means, respectively. 6. The receiver tank for a heat pump system according to claim 5, wherein the refrigerant outflow suppressing means is a bent piece inwardly of the first and second inflow / outflow pipes. 7. The receiver tank for a heat pump system according to claim 5, wherein the refrigerant outflow suppression means is a suppression valve provided in the outflow opening.