JPH083887Y2 - Heat pump equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat pump device, and more particularly to a heat pump device using a non-azeotropic mixed refrigerant as a working medium.

(Prior Art) A heat pump device using a conventional non-azeotropic mixed refrigerant is shown in FIG.

In FIG. 2, 1 is a compressor, 2 is a condenser, 3 is a throttle device, 4 is an evaporator, and the compressor 1, the condenser 2, the throttle device 3 and the evaporator 4 constitute a main cycle. There is. Then, the outlet of the condenser 2 and the top of the rectification tower 11 are connected by a pipe 12, and the top of the rectification tower 11 and the inlet of the evaporator 4 are also connected by a pipe 13 via a sub-throttler 14. The column bottom reservoir 15 is annularly connected to the column bottom of the rectification column 11.

In addition, the pipe 17 includes a bottom reservoir 15, a two-way valve 16, and a sub-throttle device 14.
The heating source 18 is connected to the inlet side of the evaporator 4 via the, and a heating source 18 is provided near the bottom reservoir 15.

In such a configuration, when the two-way valve 16 is closed, the refrigerant liquefied in the condenser 2 remains at a high pressure and passes through the pipe 12 to the rectification column 11
On the other hand, the liquid refrigerant flowing down from the tower top part of the column bottom reservoir 15 is heated by the heating source 18 and vaporized, and rises in the rectification column 11. At this time, the gas component rising inside the rectification column 11 due to the rectification action with the liquid component flowing down is richer in the low boiling point refrigerant as it goes upward. The gas refrigerant reaching the tower top is mixed with the refrigerant flowing in the main cycle circuit via the sub expansion device 14 because the pipe 13 is always open, and the refrigerant itself circulating in the main cycle circuit is rich in low boiling point refrigerant. It becomes a state.

Further, when the two-way valve 16 is opened, the rectification column 11 is present at the inlets of the high-pressure condenser 2 and the low-pressure evaporator 4 which are communicated with each other through the pipe 17. The flow velocity of the liquid refrigerant flowing down from the top is increased, the rectification action is stopped by suppressing the rise of gas components generated at the bottom of the rectification column 11, and the main cycle circuit remains the enclosed non-azeotropic mixed refrigerant. (See, for example, Japanese Patent Laid-Open No. 62-245053).

(Problems to be solved by the invention) However, in this conventional heat pump device,
Since the inflow port of the non-azeotropic mixed refrigerant in 11 is provided only at one place on the tower top, there is a problem that it takes a long time to separate the non-azeotropic mixed refrigerant until the desired composition ratio is reached. there were.

That is, when operating the heat pump cycle by mixing the non-azeotropic mixed refrigerant, because it has the same composition in the main cycle and the reservoir 15, if only the inlet of the rectification column upper part,
This is because at the beginning of the separation operation, the column bottom and top of the rectification column 11 have the same liquid composition, and the mixed refrigerant returns to the main cycle with almost no rectification.

The present invention has been devised in view of such problems of the conventional apparatus, and shortens the separation time of the non-azeotropic mixed refrigerant by changing the inflow position of the non-azeotropic mixed refrigerant to the rectification column. Therefore, it is an object of the present invention to provide a heat pump device that improves the efficiency of the entire device.

(Means for Solving the Problems) According to the present invention, the compressor, the condenser, the expansion device, and the evaporator are sequentially connected in an annular shape, and the outlet of the condenser and the inlet of the evaporator are connected. In a heat pump device provided with a rectification tower for separating a non-azeotropic mixed refrigerant, a plurality of inlet sections having height differences are provided in the rectification tower, and the plurality of inlet sections and the condenser are provided. A control valve is provided between the control valve and at the beginning of the separation operation of the non-azeotropic mixed refrigerant with the control valve, the low inlet portion is selected as an inlet for introducing the non-azeotropic mixed refrigerant into the rectification column, Provided is a heat pump device characterized in that, after a lapse of time, the inlet is sequentially switched to the inlet at a high place in accordance with the progress of separation of the non-azeotropic mixed refrigerant.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of a heat pump device according to the present invention, in which 1 to 4 are the same constituent elements as in the conventional example, and a compressor 1, a condenser 2, a throttle device 3 and an evaporator are shown. The device 4 constitutes the main cycle.

The main difference of the configuration of the present invention is that a plurality of, for example, two inlet portions with different heights are provided so that the inflow height of the non-azeotropic mixed refrigerant into the rectification column 11 can be made different. That is. That is, the lower part of the rectification tower 11 is provided with an inlet part 5a in the middle thereof, and the top part of the rectification column 11 is provided with an entrance part of the high place.
5b is provided.

The plurality of inlet portions 5a, 5b and the outlet portion of the condenser 2 are connected via a control valve 6, and the control valve 6 and the plurality of inlet portions 5a, 5b of the rectification column 11 are connected by piping. Connected by 7a and 7b.

As the control valve 6, for example, the inlet of the rectification tower 11 is
When providing three, a three-way valve or the like is used, and when providing three inlets of the rectification column 11, a four-way valve or the like is used.

In this heat pump cycle, for example, a low boiling point refrigerant R22 that can obtain a high refrigerating capacity in a low temperature range, a non-azeotropic mixed refrigerant in which a high boiling point refrigerant R114 is mixed in order to reduce the pressure of the refrigerant in a high temperature range, and the like are used.

In FIG. 1, 16 is a two-way valve for selectively performing a mixed refrigerant separation operation and a mixing operation, and 18 flows down from the rectification column 11 during the mixed refrigerant separation operation. It is a heating source for heating the non-azeotropic mixed refrigerant.

Next, the operation of this heat pump cycle will be described.

First, when the two-way valve 16 is opened, the high boiling point component (for example, R114) stored in the reservoir 15 flows into the main cycle via the pipe 17, and the high boiling point refrigerant ( For example, R114) and a low boiling point refrigerant (for example, R22) are circulated in a mixed state.

On the other hand, when the two-way valve 16 is closed, the refrigerant discharged from the condenser 2 passes through the control valve 6 and enters the rectification column 11, where the high boiling point component (eg R114) is liquefied. The low boiling point component (for example, R22) passes through the rectification column 11 as a gas and flows into the pipe 13, and passes through the sub-throttle portion 14 into the main cycle. Return. Therefore, in the main cycle, the refrigerant circulates in a state rich in low boiling point components (for example, R22).

In this case, at the beginning of the separation operation of the non-azeotropic mixed refrigerant, the control valve 6 is made to flow the non-azeotropic mixed refrigerant through the low inlet 5a of the plurality of inlets 5a, 5b of the rectification tower 11. Therefore, the rectification column is effectively used, and the non-azeotropic mixed refrigerant is strongly subjected to the rectification action, and the refrigerant rich in the lower boiling point component (for example, R22) is mainly passed through the pipe 13 and the sub expansion device 14. Flow into the cycle. That is, at the beginning of the separation operation, since there is a large difference between the composition of the refrigerant in the main cycle and the composition of the refrigerant gas generated from the top of the rectification column 11, there is a refrigerant close to the composition of the refrigerant in the main cycle. By causing the refrigerant to flow into a low place in the rectification column 11, the rectification can be performed more efficiently. Since the composition of the refrigerant in the main cycle gradually becomes rich in low-boiling components, the position in the rectification column where low-boiling components and high-boiling components exist in the same ratio gradually increases as the separation proceeds. Move to another place. For this reason, by moving the inflow position of the non-azeotropic mixed refrigerant to a higher place as the separation proceeds, rectification can be proceeded more efficiently. Therefore, the high-boiling refrigerant and the low-boiling refrigerant are surely separated in a short time, and after a certain period of time, the refrigerant in the main cycle becomes rich in low-boiling components (for example, R22) to some extent, Since the non-azeotropic mixed refrigerant is caused to flow in from the inlet portion 5b at a high place, a more accurate rectification action is performed, and a low boiling point refrigerant is remarkably rich in the main cycle.

In addition, in the above-mentioned embodiment, the two parts of the middle part and the top part of the rectification tower 11 are used.
Although it has been described that the inlet portion for the non-azeotropic mixed refrigerant is provided at each of the three places, the present invention is not limited to this embodiment. For example, the inlet portion is provided at three places of the bottom, middle, and top of the rectification column 11. May be provided to allow the non-azeotropic mixed refrigerant to sequentially flow into the rectification column 11 from the inlet at a low place, or more inlets may be provided. That is, the more inlets of the rectification tower 11 are provided, the more the inlet can be selected according to the inflow composition, and the rectification tower can be used more effectively, so that the non-azeotropic mixed refrigerant can be reliably separated in a short time. It will be possible.

(Effects of the Invention) As described above, according to the heat pump device of the present invention, the rectification tower is provided with a plurality of inlets having different heights, and between the plurality of inlets and the condenser. A control valve is provided to allow the non-azeotropic mixed refrigerant to flow from the inlet at a low place at the beginning of the separation operation of the non-azeotropic mixed refrigerant with the control valve, and to non-azeotrope from the inlet at a high place after a certain period of time. Since the mixed refrigerant is allowed to flow into the rectification column, the separation time of the non-azeotropic mixed refrigerant can be shortened and the non-azeotropic mixed refrigerant can be separated with high accuracy, thereby improving the efficiency of the entire device. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a heat pump device according to the present invention, and FIG. 2 is a schematic configuration diagram showing a conventional heat pump device. 1 ... Compressor, 2 ... Condenser 3 ... Throttling device, 4 ... Evaporator 5a, 5b ... Inlet, 6 ... Control valve 11 ... Fractionation tower

Claims (1)

[Scope of utility model registration request] 1. A compressor, a condenser, a throttle device, and an evaporator are sequentially connected in an annular shape, and a non-azeotropic mixed refrigerant is separated between an outlet of the condenser and an inlet of the evaporator. In the heat pump device provided with the rectification tower, the rectification tower is provided with a plurality of inlet portions having height differences, and a control valve is provided between the plurality of inlet portions and the condenser, and the control valve is provided. At the beginning of the separation operation of the non-azeotropic mixed refrigerant, at the beginning of the operation to select the non-azeotropic mixed refrigerant, the low inlet is selected as the inlet for introducing the non-azeotropic mixed refrigerant, and after a certain period of time, the non-azeotropic mixed refrigerant is separated. The heat pump device is characterized in that the inlet is sequentially switched to the inlet of a high place according to the progress of the heat pump.