JP2759367B2 - Refrigerant system in absorption heat pump air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant system in an absorption heat pump cooling and heating device.

(Prior Art) Absorption-type cycles are widely used in various types of cooling / heating water devices, but are hardly practically used as heat pump cooling / heating devices, particularly air-cooling heat pump cooling / heating devices. When an air-cooled heat pump air conditioner is configured using this absorption cycle, heat is absorbed from the evaporator during the cooling operation, so that the indoor heat exchanger may be operated as an evaporator. The refrigerant pipe to the inner heat exchanger may be two pipes. However, in the heating operation, heat generated in both the condenser and the absorber is radiated. Requires two heat exchangers to perform these operations, and therefore requires four pipes for the refrigerant pipe to the indoor heat exchanger, and eventually the refrigerant pipe to the indoor heat exchanger becomes a four-pipe type. .

(Problems to be Solved by the Invention) In a four-tube refrigerant pipe, there is a problem that piping and construction become complicated and a required space becomes large.

An object of the present invention is to solve the above problems.

(Means for Solving the Problems) The structure of the present invention for solving the above problems will be described with reference to the drawings showing the embodiments. The refrigerant system in the absorption heat pump cooling and heating apparatus of the present invention is an indoor type. A heat exchanger 1 and an outdoor heat exchanger 2 are provided, and one end of each of the indoor heat exchanger 1 and the outdoor heat exchanger 2 is connected to each of the selection ports 3a and 3b of the four-way valve 3.
And an expansion valve 4a at the other end of the indoor heat exchanger 1.
And one end of the parallel path 6a of the check valve 5a, and one end of the parallel path 6b of the expansion valve 4b and the on-off valve 5b to the other end of the outdoor heat exchanger 2. These parallel paths 6a, 6b Are connected to each other, and the high-pressure refrigerant vapor path 8 from the regenerator 7 and the low-pressure refrigerant vapor path 10 to the absorber 9 constituting the absorption cycle are connected to the common ports 3i, 3o, an absorber heat-dissipating path 12 provided with a heat exchange section 11 with the absorber 9 is connected, the upstream side is connected to the other end of the parallel path 6b, and the downstream side is a three-way valve. 13, the one-way selection port 13a of the three-way valve 13 is connected to one end of the outdoor heat exchanger 2, and the other selection port 13b is connected to the indoor heat exchange through a check valve 14. Connected to one end of the absorber 1, and a heat exchange section 11 with the absorber 9 in the absorber radiation path 12.
A refrigerant tank 15 and a three-way valve 16 having a path from the refrigerant tank 15 connected to a common port 16c are provided upstream of the three-way valve 1.
6, one selection port 16a is connected to the heat exchange unit 11 side, and the other wire port 16b is connected to a solution tank 17 constituting an absorption cycle via a check valve 18 to control the refrigerant amount. 19
It is what constituted.

(Operation and Example) Next, the operation of the present invention described above will be described with reference to the first example corresponding to the example.
This will be described with reference to FIGS. FIG. 2 is a system diagram showing an embodiment corresponding to the entire configuration of the present invention, and FIG. 1 is a diagram showing a cooling amount adjusting mechanism 19 for explaining cooling, heating and defrosting operations. It is the system diagram which omitted the structure for convenience.

First, when performing cooling, as shown in FIG. 1 (a), the four-way valve 3 allows the common port 3i to communicate with the outdoor heat exchanger 2 via the selection port 3b, and connects the common port 3o to the selection port. It communicates with the indoor heat exchanger 1 via 3a. On the other hand, as indicated by hatching in the figure, the three-way valve 13 of the absorber heat release path 12 has a common port.
The selection port 13a communicates with the selection port 13c, and the on-off valve 5b is operated to be opened.

Thus, the high-temperature and high-pressure refrigerant vapor generated by being heated by an appropriate heating source in the regenerator 7 passes through the high-pressure refrigerant vapor path 8, reaches the outdoor heat exchanger 2 through the four-way valve 3, and is converted to outside air. Radiates and condenses. Next, the refrigerant flows through the path 20b to the indoor side via the on-off valve 5b, is decompressed via the expansion valve 4a in the indoor unit R, and reaches the indoor heat exchanger 1. Then, the refrigerant evaporates in the indoor heat exchanger 1 to remove indoor heat and cool the room. In this way, the low-pressure refrigerant vapor that robbed the indoor heat flows through the path 20a with the indoor side,
After returning to the low-pressure steam path 10 through the four-way valve 3, the concentrated solution in the concentrated solution path 21 from the regenerator 7 to the absorber 9 merges with the concentrated solution to reach the absorber 9, where the solution is absorbed by the concentrated solution, 17
And then return to the regenerator 7 via the dilute solution path 22.

On the other hand, the refrigerant flowing through the absorber radiation path 12 takes away the absorption heat generated in the absorber 9 and evaporates in the heat exchange section 11, and passes through the three-way valve 13 through the path 24 to the refrigerant vapor from the regenerator 7. It merges and reaches the outdoor heat exchanger 2, where it is condensed and radiated. In this manner, the refrigerant that has reached the other end of the parallel path 6b from the outdoor heat exchanger 2 via the on-off valve 5b is partially branched into the absorber radiation path 12, flows in, and circulates.

As described above, the indoor heat exchanger 1 is operated as an evaporator, and the refrigerant vapor from the regenerator 7 and the refrigerant vapor deprived of heat generated in the absorber 9 are combined with the outdoor heat exchanger 2. Since the outdoor heat exchanger 2 flows and operates as a condenser, the outdoor heat exchanger 2 also serves as a cooling radiator for the absorber 9, and thus can perform cooling using an absorption cycle.

Next, when heating is performed, as shown in FIG. 1 (b), the four-way valve 3 connects the common port 3o to the outdoor heat exchanger 2 through the selection port 3b, and connects the common port 3i to the selection port. It communicates with the internal combustion exchanger 1 via 3a. On the other hand, as indicated by hatching in the figure, the three-way valve
13 communicates the common port 13c with the selection port 13b, and also includes an on-off valve 5b.
Is operated to be closed.

Thus, the high-temperature and high-pressure refrigerant vapor generated in the regenerator 7 passes through the high-pressure refrigerant vapor path 8, flows through the four-way valve 3 and the path 20a with the indoor side, and reaches the indoor heat exchanger 1, where the indoor heat exchanger 1 The heat is released and condensed, and is provided for heating. Next, the refrigerant flows through the path 20b to the indoor side via the check valve 5a, a part of the refrigerant flows into the absorber radiation path 12, and the rest is decompressed through the expansion valve 4b and reaches the outdoor heat exchanger 2. Then, the refrigerant evaporates in the outdoor heat exchanger 2 and takes heat of the outside air. The low-pressure refrigerant vapor from which the heat of the outside air has been removed passes through the low-pressure steam path 10 via the four-way valve 3 as in the above-described cooling operation, and the concentrated solution path 21 from the regenerator 7 to the absorber 9 as in the cooling operation. And flows into the solution tank 17 after being absorbed by the concentrated solution, and then returns to the regenerator 7 via the dilute solution path 22.

On the other hand, as described above, the refrigerant flowing into the absorber radiation path 12 from the path 20b to the indoor side takes away the heat of absorption generated in the absorber 9 and evaporates in the heat exchange section 11, and passes through the three-way valve 13. Flowing through the heat radiation path 25, and passing through the check valve 14 to the indoor side 20a
, And merges with the high-temperature and high-pressure refrigerant vapor flowing in from the high-pressure vapor path 8 via the four-way valve 3 to reach the indoor heat exchanger 1 where heat is released and used for heating the room.

As described above, the refrigerant vapor from the regenerator 7 and the refrigerant vapor deprived of heat generated in the absorber 9 are combined and supplied to the indoor heat exchanger 1 to operate as a condenser, and to operate as a condenser. By operating as an evaporator, heat pump heating using an absorption cycle can be performed.

As is clear from the above description, in the present invention, the indoor heat exchanger 1 is used not only in the cooling operation but also in the heating operation.
Path, that is, the path 20a, 20b with the indoor side may be a pair,
Therefore, the pipe to the indoor heat exchanger 1 can be configured as a two-pipe type.

In the above heating operation, when frost occurs in the outdoor heat exchanger 2, the on-off valve 5 is opened. Thus, the refrigerant vapor reaching the indoor heat exchanger 1 via the path 20a to the indoor side is partially radiated here, and condensed while passing through the path 20a to the indoor side.
After b, a part of it flows into the outdoor heat exchanger 2 via the on-off valve 5b. The refrigerant vapor is condensed here, and the heat released at this time can melt and remove the frost of the outdoor heat exchanger 2 which has been operating as an evaporator. The refrigerant condensed in the outdoor heat exchanger 2 then returns from the four-way valve 3 through the low-pressure steam path 10 to the absorption cycle. On the other hand, as described above, the refrigerant that has flowed into the absorber radiation path 12 from the path 20b to the indoor side takes away the absorption heat generated in the absorber 9 and evaporates in the heat exchange unit 11 in the same manner as in the above-described heating operation. Then, it flows through the heat radiation path 25 through the three-way valve 13, reaches the path 20 a with the indoor side through the check valve 14, and merges with the high-temperature and high-pressure refrigerant vapor flowing from the high-pressure vapor path 8 through the four-way valve 3. The heat reaches the indoor heat exchanger 1, where the heat is released and the indoor heat exchanger 1 is heated.

In the above cooling, heating or defrosting operation, the ratio of the amount of the refrigerant flowing through the absorber radiation path 12 to the total amount is:
It can be adjusted and maintained appropriately by the refrigerant amount adjusting mechanism 19 according to the present invention.

That is, in the state of FIG. 2A showing the heating operation, when the amount of the refrigerant flowing into the absorber radiation path 12 becomes excessive, the refrigerant in the refrigerant tank 15 corresponding to the excessive amount of the refrigerant. The three-way valve 16 is controlled by detecting the rise of the liquid level by the liquid level gauge 26, and the common port 16c and the selection port 16b are controlled as shown in FIG.
And the refrigerant flowing into the absorber heat radiation path 12 is returned to the solution tank 17 via the return path 27 provided with the check valve 18, and if the excess is eliminated in this way, a three-way By controlling the valve 16 again to return to the state shown in FIG. 2 (a) and controlling the liquid level of the refrigerant tank 15 to a constant level in this manner, the total amount of refrigerant flowing through the absorber radiation path 12 is reduced. The ratio to the amount can be appropriately maintained.

The present invention described in detail above can be applied to an appropriate refrigerant, an absorption cycle using an absorbent, and the dilute solution in the above description is a solution containing a large amount of refrigerant, A concentrated solution refers to a solution containing less refrigerant.

In the figure, reference numeral 28 denotes a pressure reducing means, 23 and 29 denote pumps, and 30 denotes a solution heat exchanger.

(Effect of the Invention) As described above, the present invention provides an indoor heat exchanger that operates as an evaporator in the cooling operation, and a refrigerant vapor from the regenerator and the heat generated in the absorber in the heating operation. Since the taken refrigerant is combined and supplied and operated as a condenser, the path to the indoor heat exchanger in the heating operation as well as the cooling operation, that is, the path to the indoor side may be a pair, Therefore, there is an effect that the pipe to the indoor heat exchanger can be configured as a two-pipe type, and a defrosting operation while heating is also possible. Further, in the present invention, in each of the above operations, there is an effect that the ratio of the amount of the refrigerant flowing through the absorber radiation path to the total amount can be appropriately maintained by the refrigerant amount adjusting mechanism.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) show an embodiment of the entire configuration of the present invention, in which the configuration of the entire configuration is omitted for convenience of the refrigerant amount adjusting mechanism, and the operation is a cooling operation and a heating operation. 2 (a) and 2 (b) are system diagrams illustrating an embodiment of the overall configuration of the present invention in the operation of adjusting the amount of refrigerant. Symbol 1 ... indoor heat exchanger, 2 ... outdoor heat exchanger, 3 ...
Four-way valve, 4a, 4b …… Expansion valve, 5a, 14, 18 …… Check valve, 5b…
... On-off valve, 6a, 6b ... Parallel path, 7 ... Regenerator, 8 ...
High-pressure refrigerant vapor path, 9: absorber, 10: low-pressure refrigerant vapor path, 11: heat exchange unit, 12: absorber radiation path, 13, 16
... three-way valve, 15 ... refrigerant tank, 17 ... solution tank, 19
…… Refrigerant amount adjustment mechanism, 20a, 20b …… Route to indoor side, 21
… Concentrated solution route, 22… dilute solution route, 24… route, 25…
… Radiation path, 23,29… pump, 26 …… level gauge, 27 ……
Return path, 28 ... decompression means, 30 ... solution heat exchanger.

Claims (1)

(57) [Claims] An indoor heat exchanger and an outdoor heat exchanger are provided. One end of each of the indoor heat exchanger and the outdoor heat exchanger is connected to each selection port of a four-way valve. One end of the parallel path of the expansion valve and the check valve is connected to one end, and one end of the parallel path of the expansion valve and the on-off valve is connected to the other end of the outdoor heat exchanger. And a high-pressure refrigerant vapor path from the regenerator constituting the absorption cycle and a low-pressure refrigerant vapor path leading to the absorber are connected to respective common ports of the four-way valve, and heat exchange with the absorber is performed. A part of the absorber radiation path is configured, the upstream side is connected to the other end side of the parallel path, the downstream side is connected to a common port of the three-way valve, and one selection port of the three-way valve is connected. One end of the outdoor heat exchanger is connected to the other end of the indoor heat exchanger via a check valve. A refrigerant tank upstream of a heat exchange part with the absorber in the heat radiation path of the absorber, and a three-way valve connected to a common port from the refrigerant tank; One selection port of the valve is connected to the heat exchange section side, and the other selection port is connected to a solution tank constituting an absorption cycle via a check valve to constitute a refrigerant amount adjusting mechanism. System in absorption type heat pump air conditioner