JP2017036860A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device including a flow diverter that can maintain a state where a flow rate is high immediately before flow diverting to inhibit generation of a drift current.SOLUTION: The air conditioning device 10 circulates a refrigerant compressed by a compressor 3 to a condenser 4, a decompression device 6, a flow diverter inflow pipe 7, the flow diverter 8 and an evaporator 9 in series and returns the refrigerant to the compressor 3. An inner diameter 7A of the flow diverter inflow pipe 7 and an inner diameter 14A of flow diverter inner piping 14 provided inside the flow diverter are smaller than an inner diameter of a heat transfer pipe 11 provided inside the evaporator 9.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner including a flow divider that diverts a refrigerant.

Conventionally, in an air conditioner, a refrigerant that particularly flows into a heat exchanger on the evaporator side is branched by a flow divider and flows into each refrigerant flow path. When the flow rate of the refrigerant is slow, the refrigerant is biased between the liquid and the gas, and a drift occurs.
For example, the technology described in Patent Document 1 is a technology related to the structure of a flow divider, and by providing a throttle shape at the inlet of the flow divider, increasing the flow velocity, and mixing the liquid and gas uniformly. We are solving the problem of drift current.

Japanese Patent Laid-Open No. 7-294061

However, in the conventional configuration described above, since the inlet of the flow divider has a throttle shape, the flow velocity is slow immediately after passing through the throttle, and there is a problem that the liquid and the gas are biased before the flow is divided.
This invention is made in view of the situation mentioned above, and it aims at providing the air conditioning apparatus provided with the flow divider which can maintain the state where the flow velocity is quick until just before a diversion, and can suppress generation | occurrence | production of a drift. To do.

  In order to achieve the above object, the present invention provides an air conditioner that circulates refrigerant compressed by a compressor through a condenser, a decompression device, a flow divider inlet pipe, a flow divider, and an evaporator and returns the refrigerant to the compressor. The inner diameter of the flow divider inflow pipe and the inner diameter of the pipe in the flow divider provided in the flow divider are smaller than the inner diameter of the heat transfer pipe provided in the evaporator.

  Further, the present invention is characterized in that an inner diameter of the flow divider inlet pipe and an inner diameter of the pipe in the flow divider are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe.

  Further, the present invention is characterized in that a freeze prevention pipe is provided at a position upstream of the flow divider inflow pipe and downstream of the decompression device, and the freeze prevention pipe is provided in the evaporator.

  According to the present invention, the inner diameter of the flow-divider inflow pipe and the inner diameter of the flow-divider internal pipe are configured to be smaller than the inner diameter of the heat transfer pipe. The flow velocity becomes faster, and it is possible to keep the flow velocity high until just before the diversion. Since the flow can be divided in a relatively uniformly mixed state without being biased to the liquid and the gas until just before the flow is divided, the occurrence of the drift can be suppressed.

It is a block diagram of the refrigerating circuit which concerns on embodiment of this invention. It is a block diagram of an outdoor side heat exchanger and an outdoor side shunt. It is a schematic diagram of an outdoor shunt. It is a block diagram of the freeze prevention pipe | tube, outdoor shunt, and outdoor heat exchanger which concern on another embodiment. It is the Mollier diagram of the refrigerant | coolant which concerns on another embodiment.

A first aspect of the present invention is an air conditioner in which a refrigerant compressed by a compressor is circulated through a condenser, a decompression device, a flow divider inlet pipe, a flow divider, and an evaporator and returned to the compressor. In the air conditioner, the inner diameter of the pipe in the flow divider provided in the flow divider is smaller than the inner diameter of the heat transfer tube provided in the evaporator.
In the present invention, the refrigerant flow velocity at the same refrigerant flow rate is increased by making the inner diameter of the flow divider inflow pipe and the inner diameter of the flow divider inner pipe smaller than the heat transfer pipe inner diameter of the evaporator.
For example, even under conditions where the refrigerant flow rate is small, such as during intermediate operation, the refrigerant flow rate is maintained at a higher speed until just before the diversion than in the prior art in which the inner diameter of the flow-divider inlet pipe and the flow path in the flow divider is larger than the inner diameter of the heat transfer pipe. As a result, the liquid and gas can be diverted in a relatively uniformly mixed state, and deterioration of the diversion to each refrigerant flow path in the diverter can be suppressed.

A second invention is characterized in that, in the first invention, the inner diameter of the flow divider inflow pipe and the inner diameter of the pipe in the flow divider are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe. It is an air conditioner.
In the present invention, for example, when the refrigerant R32 is used and the inner diameter of the flow-divider inlet pipe and the inner diameter of the pipe in the flow-divider are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe, Compared to the same capacity air conditioner using R410A, which is designed so that the inner diameter of the flow divider inlet pipe and the inner diameter of the pipe inside the flow divider are larger than the inner diameter of the heat transfer pipe, the flow divider inlet pipe and the flow divider inside The pressure loss in the piping is + 40% or less. That is, when the inner diameter of the flow-divider inlet pipe and the inner diameter of the pipe in the flow-divider are in the range of 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe, a significant increase in pressure loss in the pipe is suppressed. However, similarly to the first invention, it is possible to suppress the deterioration of the diversion to each refrigerant flow path in the diversion device.

A third aspect of the present invention is the air conditioner according to any one of the first to second aspects, further comprising an anti-freezing pipe upstream of the flow divider inflow pipe, and the anti-freezing pipe is provided in the evaporator. is there.
In this invention, by reducing the inner diameter of the shunt inlet pipe and the inner diameter of the shunt pipe, the pressure loss in the shunt inlet pipe and the shunt pipe increases, but the pressure reduction width in the decompressor can be reduced. For this reason, the pressure of the refrigerant in the anti-freezing pipe increases. Since the pressure and temperature in the anti-freezing pipe are increased, the anti-freezing ability in the evaporator can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a refrigerant circuit in an air conditioner 10 according to an embodiment of the present invention. FIG. 2 is a configuration diagram of the outdoor heat exchanger 9 and the outdoor shunt 8 when it functions as an evaporator during heating operation. FIG. 3 is a schematic diagram of the outdoor shunt 8. In the present embodiment, the case where the air-conditioning apparatus 10 is operated for heating will be described.
The air conditioner 10 includes an outdoor unit 1 and an indoor unit 2. The outdoor unit 1 includes a compressor 3, a four-way valve 15, an outdoor heat exchanger 9 as an evaporator, an outdoor flow divider 8 as a flow divider, a pressure reducing device 6, an outdoor flow divider 8 and a pressure reducing device 6. A shunt inlet pipe 7 to be connected is provided. The indoor unit 2 includes an indoor shunt 5 and an indoor heat exchanger 4 as a condenser.

  The compressor 3 provided in the outdoor unit 1 is connected to one end of the indoor side heat exchanger 4 provided in the indoor unit 2 through a four-way valve 15 by a refrigerant pipe 12. The indoor side flow divider 5 is connected to the other end side of the indoor side heat exchanger 4, and the indoor side flow divider 5 is connected to a decompression device 6 provided in the outdoor unit 1 by a refrigerant pipe 12. The decompression device 6 is connected to the outdoor flow divider 8 by a flow divider inlet pipe 7.

As shown in FIG. 2, the flow divider inflow pipe 7 becomes a flow divider internal pipe 14 inside the outdoor flow divider 8. This in-divider pipe 14 branches into a plurality of diverter outflow pipes 13 a to 13 d inside the outdoor diverter 8. The number of branches of the flow divider outflow pipes 13a to 13d corresponds to the number of paths of the heat transfer pipe 11 provided in parallel with the outdoor heat exchanger 9 being four.
In addition, the number of paths of the heat transfer pipes 11 provided in parallel to the outdoor heat exchanger 9 and the number of branches of the flow divider outlet pipes 13 corresponding to the number of paths can be changed as appropriate.

As shown in FIG. 3, in the present embodiment, the flow divider inflow pipe 7 is connected to the inlet opening of the flow divider inner pipe 14, and the inner diameter 7 </ b> A of the flow divider inflow pipe 7 and the inner diameter of the flow divider inner pipe 14. 14A is formed substantially equally. The inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are configured to be smaller than the inner diameter of the heat transfer pipe 11 provided in the outdoor heat exchanger 9.
The inner diameter of the heat transfer tube 11 is 7 mm. The inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe 11.
In FIG. 3, the flow divider outlet pipes 13a to 13c are omitted.

  The flow divider outflow pipes 13a to 13d branched from the flow divider inner pipe 14 are connected to one end of the heat transfer pipe 11 provided in the outdoor heat exchanger 9, and the other end of the heat transfer pipe 11 is connected to the four-way valve 15 by the refrigerant pipe 12. Is connected to the compressor 3.

The operation and action of the outdoor shunt 8 and the outdoor heat exchanger 9 configured as described above will be described below.
During the heating operation, the four-way valve 15 shown in FIG. 1 is switched as indicated by the dotted line. The refrigerant discharged from the compressor 3 flows through the refrigerant pipe 12 via the four-way valve 15 and flows into the indoor heat exchanger 4. The refrigerant radiated by the indoor heat exchanger 4 is supplied to the outdoor unit 1 through the indoor flow divider 5. The refrigerant depressurized by the decompression device 6 flows to the outdoor flow divider 8 through the flow divider inflow pipe 7, is branched by the flow divider outflow pipes 13 a to 13 d, and is supplied to the outdoor heat exchanger 9. The refrigerant having absorbed heat by the outdoor heat exchanger 9 flows through the four-way valve 15 to the compressor 3 and circulates through the refrigerant circuit.

  The flow of the refrigerant flowing into the flow divider inlet pipe 7 will be described. The inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are smaller than the inner diameter of the heat transfer pipe 11, and the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are transferred. Compared with a general configuration that is larger than the inner diameter of the heat pipe 11, the flow velocity of the refrigerant flowing through the flow divider inflow pipe 7 and the flow divider inner pipe 14 becomes faster. This is because of the relationship of refrigerant flow rate = cross-sectional area A × refrigerant flow velocity v × refrigerant density ρ. By increasing the flow velocity of the refrigerant flowing through the flow divider inflow pipe 7 and the flow divider inner pipe 14, the refrigerant flowing through these pipes can be made into an annular flow, and the occurrence of drift can be suppressed.

In the cooling operation, the four-way valve 15 shown in FIG. 1 is switched as shown by the solid line. The refrigerant discharged from the compressor 3 flows through the refrigerant pipe 12 via the four-way valve 15 and flows to the outdoor heat exchanger 9. The refrigerant radiated by the outdoor heat exchanger 9 is supplied to the indoor unit 2 through the outdoor flow divider 8 and the decompression device 6. The refrigerant that has passed through the indoor shunt 5 is supplied to the indoor heat exchanger 4. The refrigerant that has absorbed heat by the indoor heat exchanger 4 flows through the four-way valve 15 to the compressor 3 and circulates in the refrigerant circuit.
During the cooling operation, the refrigerant flowing from the flow divider outflow pipes 13a to 13d to the flow divider inflow pipe 7 and the flow divider inner pipe 14 has a high pressure, so that the pressure loss does not greatly affect the performance. Even if the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are made smaller than the inner diameter of the heat transfer pipe 11, the cooling operation is not greatly affected.

As described above, according to the present embodiment, the flow velocity of the refrigerant flowing through the flow divider inflow pipe 7 and the flow divider inner pipe 14 is increased, so that the refrigerant is immediately divided by the flow divider outflow pipes 13a to 13d. Since the refrigerant can be diverted in a relatively uniformly mixed state without being unevenly distributed between the liquid and the gas, the occurrence of uneven flow can be suppressed. The liquid and gas can be flowed through the flow divider inlet pipe 7 and the flow divider internal pipe 14 as an annular flow.
For example, when R32 is used as the refrigerant, the refrigerant refrigeration effect is larger than that of the refrigerant R410A and the refrigerant circulation amount is small, so that the refrigerant flow rate is slowed. Therefore, the inner diameter 7A of the flow divider inflow pipe 7 and the pipe in the flow divider The suppression of the diversion of the diversion by making the inner diameter 14A of 14 smaller than the inner diameter of the heat transfer tube 11 is more effective.

  Further, according to the present embodiment, the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 can be made smaller than the inner diameter of the heat transfer pipe 11, and the occurrence of drift can be suppressed and stabilized. Since the diversion can be provided, it is possible to easily estimate the adjustment of the small-diameter pipe, and the man-hours for designing the thin-diameter pipes of the diverter outflow pipes 13a to 13d can be reduced.

Further, according to the present embodiment, the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe 11. Configured.
Therefore, for example, when R32 is used as the refrigerant in the present embodiment, the inner diameter 7A of the flow-divider inflow pipe 7 and the inner diameter 14A of the flow-divider inner pipe 14 are made larger than the inner diameter of the heat transfer pipe 11 using the refrigerant R410A. The pressure loss in the flow divider inflow pipe 7 and the flow divider internal pipe 14 can be suppressed to + 40% or less as compared with the conventional technology that is increasing.
Normally, the pressure loss is proportional to the square of the flow velocity, so if the diameter is too small, the pressure loss becomes excessive and the performance as an air conditioner deteriorates. However, according to this embodiment, the pressure loss is kept within a certain range. On the other hand, the refrigerant can be allowed to flow in a uniformly mixed state without being biased to liquid and gas until immediately before being shunted by the shunt flow-out pipes 13a to 13d, and the occurrence of drift can be suppressed and a stable shunt can be provided. .
Further, it is possible to easily estimate the adjustment of the small diameter pipes of the flow divider outflow pipes 13a to 13d, and to reduce the man-hours for designing the small diameter pipes of the flow divider outflow pipes 13a to 13d.

As mentioned above, although this invention was demonstrated based on this Embodiment, this invention is not limited to this embodiment. Since the embodiments of the present invention are merely illustrated, modifications and applications can be arbitrarily made without departing from the spirit of the present invention.
For example, in the present embodiment, the outdoor shunt 8 provided upstream of the outdoor heat exchanger 9 that functions as an evaporator when the heating operation is used as a reference has been described, but the cooling operation is used as a reference. In this case, the present invention can be applied to an indoor shunt 5 provided upstream of the indoor heat exchanger 4 that functions as an evaporator. In this case, it is desirable to provide the decompression device 6 in the indoor unit 2 upstream of the indoor shunt 5 with reference to the cooling operation.

(Embodiment 2)
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, the case where the air-conditioning apparatus 10 is operated for heating will be described.
FIG. 4 is a configuration diagram of an antifreezing tube 16, an outdoor shunt 8, and an outdoor heat exchanger 9 according to another embodiment. FIG. 5 is a Mollier diagram of the refrigerant according to the second embodiment.

In the second embodiment, as shown in FIG. 4, an antifreeze pipe 16 is provided at a lower position inside the outdoor heat exchanger 9 that functions as an evaporator. The antifreezing pipe 16 is provided between the decompression device 6 and the flow divider inflow pipe 7 in the refrigerant circuit. That is, on the basis of the refrigerant flow during the heating operation, the freeze prevention pipe 16 is provided at a position upstream of the flow divider inflow pipe 7 and downstream of the decompression device 6.
The inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are configured to be smaller than the inner diameter of the heat transfer pipe 11 and the inner diameter of the freeze prevention pipe 16, and the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter of the flow divider The inner diameter 14A of the pipe 14 is 0.8 times or more the inner diameter of the heat transfer tube 11 and the inner diameter of the freeze prevention tube 16, and is configured to be less than 1.0 times.

The operation and action of the antifreezing tube 16, the outdoor flow divider 8 and the outdoor heat exchanger 9 configured as described above will be described below.
During the heating operation, the four-way valve 15 shown in FIG. 1 is switched as indicated by the dotted line, and the refrigerant discharged from the compressor 3 flows through the refrigerant pipe 12 through the four-way valve and flows into the indoor heat exchanger 4. . The refrigerant radiated by the indoor heat exchanger 4 is supplied to the outdoor unit 1 through the indoor flow divider 5. The refrigerant depressurized by the decompression device 6 passes through the antifreezing pipe 16, that is, passes through the lower inner side of the outdoor heat exchanger 9, flows through the flow divider inflow pipe 7, and is divided in the outdoor flow divider 8. Branched by the outflow pipes 13a to 13d, supplied to the heat transfer pipe 11 of the outdoor heat exchanger 9, flows through the four-way valve 15 to the compressor 3, and circulates in the refrigerant circuit.

  By making the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 smaller than the inner diameter of the heat transfer pipe 11 and the inner diameter of the antifreeze pipe 16, the flow divider inflow pipe 7 and the flow divider inner pipe 14 Pressure loss increases. Normally, as shown in FIG. 5A, the refrigerant 19 at the outlet of the indoor heat exchanger (condenser) 4 has a pressure drop at the decompression device 6 and a pressure at the outdoor flow divider (divider) 8. The pressure is reduced due to the loss, and the refrigerant 20 at the inlet of the outdoor heat exchanger (evaporator) 9 is obtained. In the present embodiment, by reducing the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider internal pipe 14, as shown in FIG. 5B, the flow divider inflow pipe 7 and the flow divider internal pipe 14 are provided. The pressure loss at the pressure reducing device 6 can be reduced. Therefore, the refrigerant 18b having a higher pressure and temperature than the conventional one can be passed through the freeze prevention pipe 16, and the freeze prevention ability in the freeze prevention pipe 16 can be improved.

As described above, according to the present embodiment, the inner diameter 7A of the flow divider inflow pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are reduced, so that the flow distribution in the flow divider inflow pipe 7 and the flow divider inner pipe 14 is reduced. The pressure loss increases, and the pressure reduction width in the pressure reducing device 6 can be reduced.
Therefore, the pressure and temperature of the refrigerant 18b flowing into the antifreezing pipe 16 are set according to the prior art freezing in which the inner diameter 7A of the flow divider inlet pipe 7 and the inner diameter 14A of the flow divider inner pipe 14 are larger than the inner diameter of the heat transfer pipe 11. The pressure and temperature of the refrigerant 18a in the prevention pipe 16 can be increased. Since the refrigerant 18b having a higher pressure and temperature than the conventional one can flow through the antifreezing pipe 16, the antifreezing ability of the antifreezing pipe 16 is improved, and the outdoor heat exchanger 9 functioning as an evaporator during heating operation. Can be prevented from freezing.

  As mentioned above, although this invention was demonstrated based on this Embodiment, this invention is not limited to these embodiment. Since the embodiments of the present invention are merely illustrated, modifications and applications can be arbitrarily made without departing from the spirit of the present invention.

  As described above, the present invention can be used as an air conditioner that can suppress the deterioration of refrigerant diversion.

1 Outdoor Unit 2 Indoor Unit 3 Compressor 4 Indoor Heat Exchanger (Condenser)
5 indoor side flow divider 6 decompressor 7 flow divider inflow pipe 7A inner diameter 8 outdoor flow divider (flow divider)
9 Outdoor heat exchanger (evaporator)
DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus 11 Heat transfer pipe 12 Refrigerant piping 13a, 13b, 13c, 13d Divider outflow pipe 14 Divider inner pipe 14A Inner diameter 15 Four-way valve 16 Freezing prevention pipe 18 Refrigerant in freezing prevention pipe 19 Refrigerant 20 in condenser outlet Refrigerant at the evaporator inlet

Claims (3)

In the air conditioner that circulates the refrigerant compressed by the compressor, the condenser, the decompression device, the flow divider inlet pipe, the flow divider, the evaporator, and returns it to the compressor,
An air conditioner characterized in that an inner diameter of the flow divider inlet pipe and an inner diameter of a pipe in the flow divider provided in the flow divider are smaller than an inner diameter of a heat transfer pipe provided in the evaporator.   2. The air conditioner according to claim 1, wherein an inner diameter of the flow divider inlet pipe and an inner diameter of the pipe in the flow divider are 0.8 times or more and less than 1.0 times the inner diameter of the heat transfer pipe. apparatus. An anti-freezing pipe upstream of the flow divider inlet pipe and downstream of the pressure reducing device;
The air conditioning apparatus according to claim 1 or 2, wherein the anti-freezing pipe is provided in the evaporator.

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