JPH1019409A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of obtaining the comfortable air-conditioning by reducing the heating start-up time and the defrosting completion time on the assumption that a two-cylinder rotary type compressor is employed and a heat storage tank is provided in a bypass passage. SOLUTION: In a rotary type compressor provided with a first cylinder 1a and a second cylinder 1b, a refrigerant outlet part of an outdoor heat exchanger 5 is communicated with a first cylinder suction part of the compressor through a first suction pipe Pa, a bypass passage Sa is branched between a refrigerant outlet part of an indoor heat exchanger and an expansion valve 4, a control valve 6, a pressure reducing mechanism 7 and a heat absorbing heat exchanger 9 stored in a heat storage tank 8 are provided in the bypass passage, the heat absorbing heat exchanger of the heat storage tank is communicated with a second cylinder suction pad of the rotary type compressor through a second suction pipe Pb, and the second suction pipe is communicated with the first suction pipe through an auxiliary bypass passage Sb provided with a non-return valve 13 in a middle part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type refrigeration cycle which includes a two-cylinder rotary compressor as a compressor, and a refrigeration cycle provided with a bypass passage having a heat storage tank to perform heating operation. The present invention relates to an air conditioner with an improved defrosting operation system.

[0002]

2. Description of the Related Art A heat pump type refrigeration cycle is provided.
In an air conditioner that facilitates switching between cooling and heating operations,
By using a two-cylinder rotary compressor as a compressor constituting a refrigeration cycle, compression efficiency and heat exchange performance are improved.

[0003] This type of air conditioner has a refrigeration cycle configuration as shown in FIG. That is, A is a two-cylinder rotary compressor having a first cylinder a1 and a second cylinder a2.

A four-way valve B, an indoor heat exchanger C, an expansion valve D as a pressure reducing device, and an outdoor heat exchanger E are sequentially connected to a discharge portion of the compressor A via a refrigerant pipe P. The outdoor heat exchanger E is connected to the suction portions of the cylinders a1 and a2 of the compressor A via another port of the four-way valve B.

[0005] Switching between the cooling operation and the heating operation can be performed by switching the four-way valve B. In particular, during the heating operation, the outdoor heat exchanger E absorbs heat from the outside air, and the heat is radiated by the indoor heat exchanger C to perform the heating action.

[0006]

By the way, at the time of heating start under the condition of low outside air temperature, in order to raise the room temperature in a short time, larger capacity is required than at the time of stable heating. Is not sufficient, and it takes a long time (about 20 minutes) for the room temperature to reach the set temperature.

In the heating operation, since the outdoor heat exchanger E acts as an evaporator, drain water is generated, and when the outside air temperature is low, the drain water is frozen and easily replaced by frost. If the frost remains fixed, the heat exchange efficiency is naturally lowered, so it is necessary to defrost at an appropriate timing.

To switch from the heating operation to the defrosting operation, normally, the operation is switched from the heating cycle to the cooling cycle, the refrigerant is condensed in the outdoor heat exchanger E, and the condensed heat is used to melt and defrost the frost. ing.

However, a disadvantage of this defrosting method is that it takes a long time as in the heating start. And
During the defrosting operation, the heating operation is interrupted, so that comfortable air conditioning is impaired.

Therefore, conventionally, a bypass having a heat storage tank is added to the refrigeration cycle, and at the time of defrosting, the refrigerant is guided to the bypass to absorb heat from the heat storage tank, and the heat is radiated by the outdoor heat exchanger E. A defrosting method is considered.

In this case, since the heat storage tank is used as a single evaporator, switching means including many parts for the outdoor heat exchanger and the heat storage tank is required, which adversely affects the cost.

Further, as the heat storage agent stored in the heat storage tank,
In order to increase the heat storage density, latent heat of vaporization such as paraffin is used. However, the vaporization temperature must be lower than the melting point (solidification temperature) of paraffin, that is, 45 ° C. Can not.

As a result, the compression ratio is increased due to the low evaporation temperature, and naturally the compressor work is also increased. Therefore, it is difficult to increase the capacity of a general refrigeration cycle of an air conditioner which is limited in current as a whole.

Further, in order to secure the necessary capacity as a heat source during defrosting or the like, it is necessary to flow a large amount of refrigerant into the heat storage tank to absorb a large amount of heat, and to store such a large amount of heat. In addition, the heat storage tank must be enlarged, which is inefficient as an air conditioner.

In addition, since paraffin is a combustible material,
It is desirable to store heat in a cycle in order to minimize the use of a heater or the like, resulting in poor efficiency and a complicated circuit. The present invention has been made in view of the above circumstances, and a purpose thereof is to use a two-cylinder rotary compressor and to provide a heat storage tank in a bypass path efficiently, and efficiently store heat in the heat storage tank. An object of the present invention is to provide an air conditioner capable of obtaining comfortable air conditioning by storing heat and shortening a heating start-up time and a defrosting completion time by using the stored heat amount.

[0016]

An air conditioner according to the present invention that satisfies the above objects has the following features.
A four-way valve, an indoor heat exchanger, an air conditioner provided with a refrigeration cycle circuit that communicates an expansion valve and an outdoor heat exchanger via a refrigerant pipe so as to constitute a heat pump type refrigeration cycle, wherein the compressor is , A rotary compressor having a first cylinder and a second cylinder, a refrigerant outlet of an outdoor heat exchanger which is an evaporator during a heating operation, and a first cylinder suction of the rotary compressor. And a first suction pipe, and a bypass is branched and connected between the refrigerant outlet of the indoor heat exchanger, which is a condenser during the heating operation, and the expansion valve. A heat absorbing heat exchanger accommodated in the decompression mechanism and the heat storage tank, and the heat absorbing tank heat absorbing heat exchanger of the bypass and the suction part of the second cylinder of the rotary compressor are connected by a second suction pipe. Communication,
The second suction pipe and the first suction pipe are communicated with each other via an auxiliary bypass provided with a check valve in the middle.

According to a second aspect of the present invention, the heat storage tank according to the first aspect is communicated with a discharge part of the rotary compressor and guides a high-temperature and high-pressure gas discharged from the discharge part to be stored in the heat storage tank. A heat radiation heat exchanger for radiating heat to the heat storage medium.

The third aspect is the first and second aspects.
The heat storage medium accommodated in the heat storage tank described above is water and a partial air layer and / or a partial steam layer. The heat storage tank includes a heating unit connected to a control unit and a sensor for detecting a water temperature. The control means is provided so as to perform a heating operation of the heating means so that the water temperature detected by the water temperature detecting sensor becomes a saturated water temperature equal to or higher than the atmospheric pressure.

According to a fourth aspect, the control means according to the third aspect is configured such that when the water temperature detected by the water temperature detection sensor is equal to or lower than a set water temperature and the rotation speed of the rotary compressor is equal to or lower than a predetermined rotation speed, It is characterized in that control for performing the heating action of the heating means is performed.

According to a fifth aspect of the present invention, the control means of the third aspect controls the heating means to perform a heating operation when the room temperature is equal to or lower than the set temperature and / or when the outside air temperature is equal to or lower than the set temperature. It is characterized by.

According to a sixth aspect of the present invention, the control means according to the third aspect is arranged such that, during the heating operation, the room temperature is equal to or less than the set value;
Alternatively, when the outside air temperature is equal to or less than the set value, the control for opening the on-off valve of the bypass passage is performed.

According to a seventh aspect of the present invention, the control means switches between the heating operation and the defrosting operation, opens the on-off valve of the bypass passage while continuing the heating cycle, and expands the main circuit. It is characterized in that control for fully opening the valve is performed.

[0023] Claim 8 claims 1 and 2
The above described rotary compressor is characterized in that the displacement capacity of the second cylinder is set smaller than the displacement capacity of the first cylinder.

According to a ninth aspect, a first cylinder and a second cylinder are provided on a refrigerant suction side of the rotary compressor according to the third aspect.
And a suction cup common to the cylinders is connected, and the check valve is housed in the suction cup.

According to the air conditioner of the present invention, the heat amount is efficiently stored in the heat storage tank, and the stored heat amount is provided. And high heating can be obtained,
Heating rise time is shortened and defrosting time is shortened for comfortable air conditioning.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a refrigeration cycle of the air conditioner. In the drawing, reference numeral 1 denotes a rotary compressor provided with a first cylinder 1a and a second cylinder 1b having the same discharge capacity. The compressor 1 shares a discharge portion for the compressed refrigerant gas, and a refrigerant pipe P is connected to the discharge portion.

The refrigerant pipe P is connected to the indoor heat exchanger 3 via the first port b1 and the second port b2 of the four-way valve 2.
An automatic electronic expansion valve 4 and an outdoor heat exchanger 5 are sequentially provided. The outdoor heat exchanger 5 is connected to the suction part of the rotary compressor 1 via the third port b3 of the four-way valve 2 and the fourth port b4. These constitute a main circuit S of the refrigeration cycle.

The first cylinder 1a and the second cylinder 1b provided in the rotary compressor 1 each have a suction portion, and a refrigerant extending from a fourth port b4 of the four-way valve 2 is provided. The pipe P is a first cylinder 1a
Connected to the suction part of This refrigerant pipe is connected to the first
Is called a suction pipe Pa.

On the other hand, a bypass passage Sa is added to the main circuit S of the refrigeration cycle. To be more specific, one end of the bypass passage Sa is connected to an intermediate portion of the refrigerant pipe P that connects the indoor heat exchanger 3 and the electronic automatic expansion valve 4.

In the bypass passage Sa, an electromagnetic on-off valve 6, an expansion valve 7 as a pressure reducing mechanism, and a heat storage tank 8 are sequentially arranged from the refrigerant pipe P communicating the indoor heat exchanger 3 and the expansion valve 4. Provided.

The heat storage tank 8 is filled with a heat storage agent W, has an endothermic heat exchanger 9, an electric heater 10 as a heating means, and a temperature sensor (water temperature sensor) 11 as a heat storage agent temperature detecting means. Is arranged.

FIG. 5 shows the details of the heat storage tank 8.
A heat insulating material 12 is adhered to the entire outer peripheral surface of the heat storage tank 8 which is a closed container having a pressure resistance (3 to 4 kg / cm ² ), thereby forming a heat insulating structure. In the heat storage agent W in the tank, water is stored for about 9 minutes, and an air layer is formed in the remaining space on the water surface. That is, the heat storage agent W is mostly water and the remaining part is air.

The water is filled in the heat storage tank 8 after filling the evacuated heat storage tank 8 with water for about 9 minutes and then sealing the heat storage tank 8. Even
It may be an air layer and a water vapor layer, or a mixed layer of an air layer and a water vapor layer.

The heat-absorbing heat exchanger 9 has a heat-exchange pipe helically bent, and is mostly immersed in water as the heat storage agent W. The electric heater 10 is disposed near the bottom of the tank to achieve effective heating of water.

As shown in FIG. 1 again, the bypass S
a communicates with the endothermic heat exchanger 9 of the heat storage tank 8, where the refrigerant is guided and exchanges heat with the heat storage agent W stored in the tank.

The refrigerant pipe P extending from the endothermic heat exchanger 9 is communicated with the suction part of the second cylinder 1b of the rotary compressor 1. Here, this refrigerant pipe is
Called the second suction pipe Pb.

The first suction pipe Pa and the second suction pipe Pb are connected to each other by an auxiliary bypass passage Sb provided with a check valve 13 in the middle. The check valve 13 is
The flow of the refrigerant from the first suction pipe Pa to the second suction pipe Pb is allowed, and the flow of the refrigerant from the second suction pipe Pb to the first suction pipe Pb is prevented.

The control unit 15, which is an air conditioner having such a refrigeration cycle and is provided separately as control means, includes the rotary compressor 1, the four-way valve 2, and the electronic automatic expansion valve 4. In addition, the electromagnetic on-off valve 6, the expansion valve 7, the electric heater 10 in the heat storage tank 8, the temperature sensor 11, and the like provided in the bypass passage Sa are electrically connected.
Control is performed as described below.

For example, to perform the heating operation, the heat storage tank 8 is previously heated. That is, the control unit 15
Sends a heating signal to the electric heater 10 to heat the heat storage agent W. The temperature sensor 11 detects the temperature rise of the heat storage agent W and sends a detection signal to the control unit one by one.

The controller 15 controls the energization of the electric heater 10 so that the water temperature detected by the temperature sensor 11 becomes a saturated water temperature higher than the atmospheric pressure (set water temperature: for example, 120 ° C.).

The temperature of 120 ° C. is a temperature at which water boils in an atmosphere having a pressure of 0.2 MPa. The pressure in the heat storage tank 8, which is a closed container, becomes about 0.4 MPa due to a rise in the temperature of the heat storage agent W. Therefore, at the above set temperature of 120 ° C., the water in the container does not boil, and the safety of the heat storage tank 8 is ensured.

When it is confirmed that the temperature of the heat storage agent W has reached the set temperature, the heating operation is started. At this time, the solenoid on-off valve 6 of the bypass passage Sa is opened. That is, as shown by a solid line arrow in the figure, the high-temperature and high-pressure refrigerant gas discharged from the rotary compressor 1 is guided to the indoor heat exchanger 3 via the four-way valve 2 and condenses heat into the room to be air-conditioned. The heat is released to increase the temperature, and the refrigerant itself liquefies.

This liquid refrigerant is partially guided to the outdoor heat exchanger 5 via the electronic automatic expansion valve 4 and evaporates. Then, it is sucked into the first cylinder 1a of the rotary compressor 1 from the first suction pipe Pa via the four-way valve 2 and is compressed.

The remaining liquid refrigerant derived from the indoor heat exchanger 3 is diverted from the main circuit S to the bypass Sa. That is, the heat is guided to the endothermic heat exchanger 9 of the heat storage tank 8 via the electromagnetic switching valve 6 and the expansion valve 7. Here, the heat storage agent W in the heat storage tank 8
Endothermic from and evaporates.

The evaporative refrigerant discharged from the endothermic heat exchanger 9 is sucked into the second cylinder 1b of the compressor 1 via the second suction pipe Pb and is compressed. The refrigerant gas compressed by the second cylinder 1b and the first cylinder 1a is once discharged into the compressor, and circulates through the above-described path.

The above-mentioned control unit operates the S of the outdoor heat exchanger 5.
The degree of opening of the electronic automatic expansion valve 4 is adjusted so that the H (superheat) amount becomes optimal, and the bypass passage S is formed so that the SH amount in the endothermic heat exchanger 9 becomes a sufficiently large optimal amount.
Of the expansion valve 7 is adjusted. Therefore, the evaporation pressure in the endothermic heat exchanger 9 becomes larger than the evaporation pressure in the outdoor heat exchanger 5.

As described above, during the heating start-up operation, while the outdoor heat exchanger 5 of the main circuit S absorbs heat from the outside air,
Since the endothermic heat exchanger 9 of the bypass passage Sa absorbs heat from the heat storage tank heat storage agent W, the room temperature reaches the set temperature in a relatively short time.

FIG. 12 shows this heating start-up operation state.
Expressed as a Mollier diagram. The line segment ef is heat absorption from the outside air of the outdoor heat exchanger 5, and the line segment fb is compression in the first cylinder 1A. The line segment dg is heat absorption from the heat storage agent W of the heat absorption heat exchanger 9, and the line segment ga is compression in the second cylinder 1B.

The enthalpy of condensation (rise of heating) becomes the sum of these, and in addition to absorbing heat in the outdoor heat exchanger 5 on the air side, the heat storage agent W in the heat storage tank 8 maintained at a higher temperature than in the past. By absorbing heat from the endothermic heat exchanger 9, the evaporation temperature of the refrigerant in the endothermic heat exchanger can be increased as compared with the conventional case, and the compression ratio can be reduced. The heating capacity can be significantly increased.

The control unit 1 notifies that the room temperature has reached the set temperature.
When 5 is confirmed, the control unit sends a control signal for switching to the normal heating operation to the electromagnetic on-off valve 6, the expansion valve 7, and the electric heater 10 of the bypass passage Sa.

That is, a closing signal is sent to the electromagnetic switching valve 6, and a disconnection signal is sent to the electric heater 10. In addition, the compressor 1, the four-way valve 2, and the electronic automatic expansion valve 4
The same state as the heating start-up operation is maintained.

As shown by the solid arrows in FIG. 2, the refrigerant is sequentially sent to the rotary compressor 1-four-way valve 2-indoor heat exchanger 3-electronic automatic expansion valve 4-outdoor heat exchanger 5-four-way valve 2. And
From here, the refrigerant sucked into the first cylinder 1a of the compressor 1 from the first suction pipe Pa and the second suction pipe Pb through the check valve 13 of the auxiliary bypass passage Sb are led to the compressor 1 Is diverted into the refrigerant sucked into the second cylinder 1b.

After all, in the first and second cylinders 1A and 1B, the same compression action is performed as before, and the normal heating operation mode is set. The heat storage operation is performed not only prior to the heating operation but also during the heating operation if there is a temperature decrease due to heat release.

In this case, the control conditions of the control unit 15 are as follows.
When the energization signal to the electric heater 10 is set to a value equal to or lower than the set water temperature,
This is sent when the rotation speed of the compressor 1 is equal to or lower than a predetermined rotation speed (for example, 1/4 or less of the maximum rotation speed: about 30 Hz).

According to this, the electric heater 10 is energized when the input current of the compressor 1 is small, so that the current consumption of the entire apparatus does not exceed the current limit value, and an efficient heat storage operation can be performed. .

Alternatively, the controller 15 sends an energization signal to the electric heater 10 when the room temperature is a set value (10 ° C. or less) and / or when the outside air temperature is a set value (5 ° C. or less). Perform heat storage operation.

According to this, the heating operation using the heat storage can be continued at the time of the high load of the heating operation in which the room temperature or the outside air temperature is low, and the efficient heating operation can be performed. In addition, during the heating operation, the heat storage operation can be performed. That is, when the room temperature is equal to or lower than the set temperature (10 ° C. or lower) during the heating operation and / or when the outside air temperature is equal to or lower than the set value (5 ° C. or lower), the electromagnetic opening and closing of the bypass path Sa is performed. The valve 6 is opened to control the refrigerant to be guided to the endothermic heat exchanger 9 of the heat storage tank 8. The endothermic heat exchanger 9 absorbs a sufficient amount of heat from the heat storage agent W, keeps the condensation temperature high, and reaches the set temperature.

On the other hand, when the outside air temperature decreases, the outdoor heat exchanger 5
When the frost attached to the surface becomes thick, the heat exchange efficiency decreases. At this time, the control unit 15 performs control for switching to the defrosting operation. As shown in FIG. 3, the control unit 15 controls the opening and closing of the electromagnetic on-off valve 6 of the bypass circuit Sa and sends a fully open signal to the electronic automatic expansion valve 4 of the main circuit S. That is, the defrosting operation is performed by the heat storage operation.

In this defrosting operation, the refrigerant is guided as shown by the solid arrow. That is, the refrigerant is guided in the same state as in the heating start-up operation, but since the electronic automatic expansion valve 4 is fully opened, the liquid refrigerant derived from the indoor heat exchanger 3 passes through the electronic automatic expansion valve 4. It conducts as it is and is led to the outdoor heat exchanger 5, where it also releases the heat of condensation. Therefore, the frost adhering to the outdoor heat exchanger 5 absorbs the heat of condensation and is quickly melted and removed.

The refrigerant guided to the bypass circuit Sa is decompressed by the expansion valve 7 and then guided to the heat absorption heat exchanger 10 in the heat storage tank 8 where it absorbs heat from the heat storage agent W. The refrigerant evaporates, is sucked into the second cylinder 1b, and is compressed.

That is, the temperature of the refrigerant guided to the second cylinder 1b is higher than that of the outdoor heat exchanger 5 where it absorbs heat from the heat storage agent W and absorbs heat from the outside air. After all,
High-temperature refrigerant is guided by the outdoor heat exchanger 5, and a large amount of heat of condensation is released, so that defrosting can be completed in a relatively short time.

Since most of the heat for defrosting and heating is absorbed from the heat storage agent W in the heat storage tank 8, the defrosting operation can be performed without interrupting the heating operation. In other words, the defrosting operation starts and ends without being noticed, so that comfortable air conditioning is maintained.

FIG. 13 shows a Mollier chart during the defrosting operation. Heating is performed at line h-j. Defrosting is performed on the outdoor heat exchanger 5 by the line segment k-l, and the first heat is removed by the line segment l-i.
The compression of the cylinder 1a is performed. Thermal storage tank 8 with line segment mn
And the second cylinder 1b is compressed at the line segment no. That is, a sufficient enthalpy for defrosting is obtained.

If the heating operation during the defrosting operation is unnecessary, a general reverse defrosting control as shown in FIG. 4 may be performed. That is, the four-way valve 2 is switched from the heating operation mode to the cooling operation mode. No other control is required.

The high-temperature refrigerant discharged from the rotary compressor 1 is directly guided to the outdoor heat exchanger 5, where the heat of condensation is released to quickly melt and remove the attached frost. The liquid refrigerant derived from the outdoor heat exchanger 5 is decompressed by the electronic automatic expansion valve 4 and then partially guided to the indoor heat exchanger 3 to evaporate.
It is sucked into the first cylinder 1a of the compressor 1 via the four-way valve 2.

The remaining refrigerant flows from the main circuit S to the bypass passage Sa.
And the endothermic heat exchanger 9 in the heat storage tank 8
Endothermic from. Then, it is compressed by the second cylinder 1b. Also in this case, heat can be absorbed from the heat storage agent W to maintain a high evaporation temperature, and the defrosting time can be further reduced.

In the above embodiment, the displacement volume of the first cylinder 1a in the rotary compressor 1
Although the excluded volume of the cylinder 1b is the same, the present invention is not limited to this.

As shown in FIG. 6, the second cylinder 1b1
May be smaller than the excluded volume of the first cylinder 1a1. That is, as shown in FIG.
When the displacement volume of the second cylinder 1b is equal to that of the second cylinder 1b, the evaporation temperature and pressure of the refrigerant flowing through the bypass passage Sa are set to be high, so that more refrigerant flows into the bypass passage Sa than the outdoor heat exchanger 5. Will flow in.

Then, the outdoor heat exchanger 5 is not effectively used, and the heat amount of the heat storage agent W in the heat storage tank 8 is consumed more than necessary, so that the heat storage use time is shortened, and the heat storage use efficiency is reduced. May decrease.

In this case, it is possible to restrict the amount of the refrigerant flowing into the bypass passage Sa by restricting the expansion valve 7. However, restricting the expansion valve 7 lowers the evaporation temperature and pressure of the refrigerant. Therefore, the effect described in the above embodiment cannot be sufficiently utilized.

Therefore, the excluded volume of the second cylinder 1b1 communicating with the endothermic heat exchanger 9 of the heat storage tank 8 is made smaller than the excluded volume of the first cylinder 1a1 communicating with the outdoor heat exchanger 5.

According to this, since the refrigerant flowing through the bypass passage Sa is a high-density refrigerant while the evaporation temperature and the pressure remain high, even if the excluded volume of the second cylinder 1b1 is small, the amount of the circulated refrigerant is small. The amount of refrigerant circulating can be substantially equal to that of the first cylinder 1a1 having a large excluded volume, the flow rate of the refrigerant flowing through the endothermic heat exchanger 9 and the outdoor heat exchanger 5 is balanced, and the outdoor heat The heat exchanger 1 is effectively used, the heat storage utilization time is extended, and the electric heater 1 is used.
The running cost of 0 can be suppressed, and the efficiency of heat storage utilization can be prevented from lowering.

In the above embodiment, the first suction pipe 1a and the second suction pipe 1b communicate with each other via the auxiliary bypass passage Sb, and the check valve 13 is provided in the middle of the auxiliary bypass passage. However, the present invention is not limited to this.

As shown in FIG. 7, the first cylinder 1a
And each suction pipe P connected to the second cylinder 1b
a and Pb may be connected to a single suction cup 20. A check valve 13 is provided at the end of the first suction pipe Pa.

Originally, the suction cup was provided in the middle of the pipe connected to the suction part of the compressor, and introduced evaporative refrigerant immediately before being sucked into the compressor, where gas-liquid separation and pressure regulation were performed. , And has a sound deadening function.

Although not shown in the above-described embodiment, even if each of the first and second suction pipes Pa and Pb is provided with a dedicated suction cup, the size of each suction cup is as shown in FIG. It is necessary to provide the above-mentioned auxiliary bypass passage Sb on the suction side of these suction cups, and to provide the check valve 13 in the middle of the suction cup. You have to take up a lot of space.

In the embodiment shown in FIG. 7, the suction cup 20 is made common, and the check valve 13 is housed in the suction cup 20, so that the size can be reduced. Then, the number of brazing portions is reduced, and the productivity can be improved.

The second suction pipe Pb connected to the heat absorption heat exchanger 9 of the heat storage tank 8 is connected to the auxiliary suction cup 21.
Is provided. Further, in each of the above embodiments, only the endothermic heat exchanger 9 is housed as the heat exchanger housed in the heat storage tank 8, but the present invention is not limited to this, and the heat storage tank shown in FIGS. 8A.

As the heat storage tank 8A, an electric heater 10,
The temperature sensor 11 and the heat storage agent W are the same, and further include an endothermic heat exchanger 9A and a heat radiation heat exchanger 30, which will be described later, which are immersed in the heat storage agent W.

That is, the heat absorbing heat exchanger 9A and the heat radiating heat exchanger 30 are heat exchangers having the same form. However, the heat absorbing heat exchanger 9A has a much larger heat exchange capacity than the heat radiating heat exchanger 30. Has a large heat exchange capacity.

The heat absorbing heat exchanger 9A communicates with the second cylinder 1b via the second suction pipe Pb in the same manner in this embodiment. (In the figure, the positions of the first and second cylinders 1a and 1b are left and right opposite to those of the embodiment described so far for drawing reasons,
Substantially the same. On the other hand, one end of the heat radiation heat exchanger 30 is communicated with the discharge part of the rotary compressor 1. The other end is the first port b of the four-way valve 2
Communicated with 1. That is, the heat radiation heat exchanger 30 is provided between the discharge part of the rotary compressor 1 and the four-way valve 2.

In this case, also in the electric heater 10, the water temperature sensor 11 detects the water temperature and the control unit 1 not shown here.
The energization control is performed so that 5 becomes a saturated water temperature higher than the atmospheric pressure.
Furthermore, power is supplied also when the water temperature of the heat storage tank 8A is equal to or lower than the set water temperature and the rotation speed of the rotary compressor 1 is equal to or lower than a predetermined rotation speed.

In any of the operation modes, the refrigerant gas discharged from the rotary compressor 1 is first guided to the radiating heat exchanger 30 of the heat storage tank 8A, where it is radiated to water as the heat storage agent W.

Since the heating start-up operation, the normal heating operation, the heating operation using the heat storage, the defrosting operation using the heat storage, and the defrosting operation in the cooling mode are all the same as the refrigeration cycle described above, here, Description is omitted.

The water temperature of the heat storage tank 8A is controlled by the electric heater 10
And the heat radiation of the heat radiation heat exchanger 30 causes the temperature to rise quickly. In the state where the temperature reaches the predetermined water temperature, even if there is a heat absorbing action from the heat storage agent W by the heat absorbing heat exchanger 9A, the heat is replenished by the heat radiating heat exchanger 30 and the effect of the decrease in the heat storing agent temperature. Less is. Therefore, the electric heater 1
The time for energizing to 0 can be reduced, which contributes to a reduction in running cost.

As shown in FIG. 10, on the premise that the heat storage tank 8A is provided with an endothermic heat exchanger 9A and a heat radiating heat exchanger 30, the rotary compressor 1A has a displacement capacity of the second cylinder 1b1 equal to the second cylinder 1b1. It may be smaller than the displacement volume of one cylinder 1a1.

That is, the first cylinder 1a1 communicates with the outdoor heat exchanger 5 via the four-way valve 2 and the heat storage tank 8A
Performs larger compression work than the second cylinder 1b1 communicating with the endothermic heat exchanger 9A.

In other words, sufficient heat absorption can be performed in the outdoor heat exchanger 5, and the heat absorption in the heat storage tank 8A can be suppressed.
The heat storage agent W in the heat storage tank 8A is less likely to lose heat, and the running cost of the electric heater 10 can be suppressed.

As shown in FIG. 11, the first cylinder 1a
And each suction pipe P connected to the second cylinder 1b
a, Pb may be connected to a single suction cup 20, and a check valve 13 may be provided at the end of the first suction pipe Pa in the suction cup 20.

Therefore, the suction cup 20 is made common and compact, and the check valve 13 is housed in the suction cup 20 to reduce the number of brazing points.
Manufacturability can be improved. Further, the second suction pipe Pb connected to the heat absorption heat exchanger 9 of the heat storage tank 8 is provided with an auxiliary suction cup 21.

[0091]

As described above, according to the first aspect of the present invention, the rotary compressor of two cylinders is provided, and the refrigerant outlet of the outdoor heat exchanger and the first cylinder suction part are communicated by the first suction pipe. Then, a bypass is branched and connected between the refrigerant outlet of the indoor heat exchanger and the expansion valve, and an on-off valve, an endothermic heat exchanger accommodated in a pressure reducing mechanism and a heat storage tank are provided in the bypass, The heat exchanger and the second cylinder suction section were communicated by a second suction pipe, and the second suction pipe and the first suction pipe were communicated by an auxiliary bypass having a check valve in the middle.

Therefore, particularly during the heating start-up operation and the normal heating operation under the condition of low outside air temperature,
In addition to heat absorption from the outside air, there is heat absorption from the heat storage tank, and the refrigerant can be kept at a high evaporation temperature, so that it can be started up in a short time and high heating performance can be obtained. In the defrosting operation, similarly, there is an effect that the defrosting is completed in a short time from the place where heat is absorbed from the heat storage tank, and the comfortable air conditioning can be maintained.

According to the second aspect of the present invention, the heat storage tank communicates with the discharge part of the rotary compressor, guides the high-temperature and high-pressure gas discharged from the discharge part, and radiates heat to the heat storage medium accommodated in the heat storage tank. Radiating heat exchanger.

Therefore, the heat absorption from the heat storage tank can be suppressed, and the heating running cost of the heating means can be reduced. In the invention of claim 3, the heat storage medium accommodated in the heat storage tank is water and a partial air layer and / or a partial steam layer,
The heat storage tank is provided with a heating means connected to the control means and a sensor for detecting a water temperature, and the control means heats the heating means so that the temperature of the heat storage agent becomes a saturated water temperature equal to or higher than the atmospheric pressure.

According to the fourth aspect of the present invention, the control means heats the heating means when the water temperature detected by the water temperature detecting sensor is equal to or lower than the set water temperature and the rotational speed of the rotary compressor is equal to or lower than a predetermined rotational speed.

According to the fifth aspect of the present invention, the control means heats the heating means when the room temperature is lower than the set temperature and / or when the outside air temperature is lower than the set temperature. In the invention according to claim 6, the control means is configured such that the room temperature is equal to or less than the set value during the heating operation,
And / or when the outside air temperature is equal to or lower than the set value, the on-off valve of the bypass is opened.

Therefore, according to the third to sixth aspects of the present invention, efficient temperature control is performed by the control means. In the invention of claim 7, the control means switches the operation from the heating operation to the defrosting operation, continues the heating cycle, opens the on-off valve of the bypass passage, and fully opens the expansion valve of the main circuit.

[0098] Therefore, defrosting is possible while continuing the heating cycle, so that comfortable air conditioning can be improved. According to the eighth aspect of the present invention, there is provided the rotary compressor in which the displacement of the second cylinder is set smaller than the displacement of the first cylinder.

Therefore, the second heat generated by heat absorption from the heat storage tank
Compression work of the first cylinder can be suppressed more than the compression work of the first cylinder, the amount of refrigerant circulated by the first and second cylinders can be made substantially equal, and heat absorption from the heat storage tank is suppressed. , High heating capacity is continuously obtained. In addition, the heat absorption from the heat storage tank can be suppressed and a high heating capacity can be obtained.

According to the ninth aspect of the invention, a suction cup common to the first cylinder and the second cylinder is connected to the refrigerant suction side of the rotary compressor, and a check valve is housed in the suction cup. Therefore, the space occupied by the suction cup can be reduced, and the labor for brazing work and the like can be reduced, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle and an electric circuit diagram of an air conditioner, showing an embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram during normal heating operation of the embodiment.

FIG. 3 is a refrigeration cycle diagram during defrosting operation using heat storage according to the embodiment.

FIG. 4 is a refrigeration cycle diagram during a defrosting operation according to the embodiment in which the operation mode is changed.

FIG. 5 is a schematic longitudinal sectional view of the heat storage tank of the embodiment.

FIG. 6 is a refrigeration cycle diagram including a compressor having a different structure according to another embodiment.

FIG. 7 is a refrigeration cycle diagram of a different configuration according to still another embodiment.

FIG. 8 is a refrigeration cycle diagram of a different configuration according to still another embodiment.

FIG. 9 is a schematic longitudinal sectional view of the heat storage tank of the embodiment.

FIG. 10 is a refrigeration cycle diagram including a compressor having a different structure according to another embodiment.

FIG. 11 is a refrigeration cycle diagram of a different configuration according to still another embodiment.

FIG. 12 is a Mollier chart during a heating operation.

FIG. 13 is a Mollier chart during a defrosting operation.

FIG. 14 is a conventional refrigeration cycle diagram.

[Explanation of symbols]

1, 1A: rotary compressor, 2: four-way valve, 3: indoor heat exchanger, 4: automatic electronic expansion valve, 5: outdoor heat exchanger, P:
Refrigerant pipe, S: main circuit, 1a, 1a1: first cylinder,
1b, 1b1 ... second cylinder, Pa ... first suction pipe, Sa ... bypass passage, 6 ... electromagnetic on-off valve, 7 ... pressure reducing mechanism (expansion valve), 8, 8A ... heat storage tank, 9, 9A ... endothermic heat Exchanger, 13: check valve, Sb: auxiliary bypass path, 30: heat radiation heat exchanger, 10: heating means (electric heater), 11: water temperature detection sensor, 20: suction cup, 21: auxiliary suction cup.

Claims (9)

[Claims] 1. A refrigeration cycle circuit for communicating a compressor, a four-way valve, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger via a refrigerant pipe so as to constitute a heat pump type refrigeration cycle. In the air conditioner, the compressor is a rotary compressor including a first cylinder and a second cylinder, and a refrigerant outlet of an outdoor heat exchanger that is an evaporator during a heating operation; A first cylinder suction portion of the compressor is communicated with a first suction pipe, and a bypass passage is branched and connected between a refrigerant outlet portion of an indoor heat exchanger, which is a condenser during a heating operation, and the expansion valve. An on-off valve, a pressure reducing mechanism, and an endothermic heat exchanger housed in a heat storage tank are provided in the bypass passage; and the heat storage tank endothermic heat exchanger in the bypass passage is connected to a second cylinder of the rotary compressor. The suction part is a second suction pipe Communicating, the second suction tube and the first suction pipe, an air conditioner, characterized in that communicating the auxiliary bypass passage provided with a check valve in the middle part. 2. The heat storage tank according to claim 1, wherein the heat storage tank communicates with a discharge part of the rotary compressor, guides a high-temperature and high-pressure gas discharged from the discharge part, and is stored in the heat storage tank. An air conditioner characterized by comprising a radiating heat exchanger for radiating heat to the air conditioner. 3. The heat storage medium stored in the heat storage tank according to claim 1 or 2 is a water and partial air layer and / or
Alternatively, the heat storage tank is provided with a heating unit connected to a control unit and a sensor for detecting a water temperature, and the control unit includes a control unit configured to control the water temperature detected by the water temperature detection sensor to be equal to or higher than the atmospheric pressure. An air conditioner characterized by performing control for performing a heating operation of the heating means so as to obtain a saturated water temperature. 4. The control means according to claim 3, wherein when the water temperature detected by the water temperature detecting sensor is equal to or lower than a set water temperature and the rotational speed of the rotary compressor is equal to or lower than a predetermined rotational speed, An air conditioner characterized by performing control for performing a heating action. 5. The control means according to claim 3, wherein the control means performs a heating operation of the heating means when the room temperature is equal to or lower than a set temperature and / or when the outside air temperature is equal to or lower than the set temperature. And air conditioner. 6. The control means according to claim 3, wherein the control means opens the on-off valve of the bypass passage when the room temperature is equal to or less than a set value and / or the outside air temperature is equal to or less than the set value during the heating operation. An air conditioner characterized by what it does. 7. The control means according to claim 3, wherein the switching from the heating operation to the defrosting operation is performed while the heating cycle is continued.
An air conditioner characterized by performing control to open the on-off valve of the bypass passage and fully open the expansion valve of the main circuit. 8. The air conditioner according to claim 1, wherein the displacement of the second cylinder is set smaller than the displacement of the first cylinder. . 9. A suction cup common to the first cylinder and the second cylinder is connected to a refrigerant suction side of the rotary compressor according to claim 3, and the check valve is housed in the suction cup. An air conditioner characterized by that: