JP2003013867A - Driving device for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device of a compressor capable of varying the quantity of a circulating refrigerant from compressors 1a, 1b in multiple stages in response to capacity of required compressor. SOLUTION: A large diameter part 11a and a small diameter part 11b are provided in a pulley 11. A belt 13a for a large diameter which transmits torque of the large diameter part 11a and a belt 13b for a small diameter which transmits torque of the small diameter part 11b are stretched around a first compressor 1a and a second compressor 1b. Electromagnetic clutches 12a, 12c are provided in the first compressor 1a. Electromagnetic clutches 12b, 12d are provided in the second compressor 1b. The electromagnetic clutches 12a, 12b for a large diameter and the electromagnetic clutches 12c, 12d for a small diameter transmits or shut off the torque transmitted from the belts 13a, 13b. Therefore the quantity of a circulating refrigerant from the compressors 1a, 1b can be variably controlled in multiple stages by the combination in response to capacity of required compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for driving two compressors by an engine, and particularly in a heat pump type air conditioner or the like, the capacity of the compressor is adjusted according to the required cooling / heating capacity. The present invention relates to a variable drive device.

[0002]

2. Description of the Related Art FIG. 5 shows a compressor drive device in a conventional heat pump type air conditioner or the like. Rotational force is transmitted from the pulley 11 directly connected to the crankshaft of the engine 10 to the compressors 1a and 1b arranged on both sides of the engine 10 by the belt 13. The compressors 1a and 1b are provided with electromagnetic clutches 12a and 12b, respectively, and transmit or interrupt the rotational force transmitted by the belt 13 to the compressors 1a and 1b.

When it is desired to reduce the capacity of the compressor in accordance with the required cooling / heating capacity, the capacity can be halved by disengaging the clutch of one of the compressors to operate. Other adjustments to the compressor capacity are made by adjusting the engine speed.

[0004]

In the heat pump type air conditioner, when the temperature of the outside air decreases, heat cannot be absorbed from the outside air and the heating capacity decreases, so the pulley ratio between the engine and the compressor is reduced. It is necessary to increase the rotation speed of the engine to increase the refrigerant circulation amount from the compressor to secure the heating capacity.

However, if the pulley ratio is kept as it is, the rotation speed of the compressor becomes high during the cooling operation, and the load factor of the engine may be exceeded. In addition, in situations where the capacity of the compressor is not required due to heating overload, or when the room temperature is stable, there is a desire to reduce the capacity of the compressor as much as possible and use energy-saving operation without using extra power. There is also. However, if the capacity of the compressor is reduced or the pulley ratio is reduced for that reason, there is a trade-off that the heating capacity becomes insufficient at the low outside temperature.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to compress the refrigerant circulation amount from the compressor in multiple stages in accordance with the required capacity of the compressor. To provide a drive device for a machine.

[0007]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the present invention, the first and second compressors (1a, 1a, 1a, 1b) for compressing and discharging the refrigerant according to the rotation of the rotary shaft
1b) and the first and second compressors (1a, 1b) respectively, which are connected in parallel to each other and transmit or block the rotational force to or from each compressor (1a, 1b). Clutch (12a, 12b) and electromagnetic clutch for small diameter (12
c, 12d), an engine (10) for driving the first and second compressors (1a, 1b), a large diameter portion (11a) having a different diameter for transmitting the rotational force of the engine (10), and A pulley (11) having a small diameter portion (11b) and a large diameter electromagnetic clutch (12) are provided to rotate torque from the large diameter portion (11a).
a, 12b) to the first and second compressors (1a, 1b), respectively, and a plurality of large diameter belts (13a), and rotational force from the small diameter portion (11b) is applied to the small diameter electromagnetic clutch (12).
c, 12d) through the first and second compressors (1a, 1b)
And a plurality of small-diameter belts (13b) that are transmitted to each,
It is characterized in that the operations of the large-diameter electromagnetic clutches (12a, 12b) and the small-diameter electromagnetic clutches (12c, 12d) are controlled as necessary.

Conventionally, this is because one compressor is operated or two
Although the refrigerant circulation amount was variable in two stages depending on the operation of the stand, selection of whether to drive each compressor with a large diameter pulley or a small diameter pulley was added. As shown in the table, it is possible to change the refrigerant circulation amount in five stages by the combination. As a result, the refrigerant circulation amount from the compressor can be changed in multiple stages in accordance with the required compressor capacity.

The invention according to claim 2 is characterized in that the capacities of the first and second compressors (1a, 1b) are different from each other.

As a result, a compressor having a larger capacity and a compressor having a smaller capacity are added to the above combination, and the refrigerant circulation amount can be changed in eight stages by the combination as shown in the table of FIG. 4, for example. It becomes possible. As a result, the refrigerant circulation amount from the compressor can be varied in multiple stages in accordance with the required compressor capacity.

By adjusting the number of rotations of the engine to these, it is possible to finely change the refrigerant circulation amount in a wide range. Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the corresponding relationship with the concrete means described in the embodiments described later.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 2 is a block diagram of a heat pump type air conditioner in one embodiment of the present invention, showing a state of a refrigeration cycle during heating. The engine 10 drives the compressor 1 by rotating the electromagnetic clutch 12 via the pulley 11 and the belt 13. Then, the compressed high-temperature and high-pressure gas refrigerant is supplied to the indoor unit A through the four-way valve 2, radiates heat (indoor heating) in the indoor heat exchanger 3 and is liquefied, and passes through the solenoid valve 4 in a fully opened state. Return to the outdoor unit B and receive the receiver 5
Accumulate in.

The high-pressure liquid refrigerant in the receiver 5 is decompressed by the solenoid valve 6 to become a low-pressure liquid refrigerant, evaporated in the outdoor heat exchanger 7, absorbed from the outside air to be partially gasified, and passed through the four-way valve 2 again. It is stored in the accumulator 8. Then, only the gas refrigerant inside is sucked into the compressor 1 and the refrigeration cycle is circulated. Incidentally, during cooling, the four-way valve 2 is switched, and the refrigerant radiated by the outdoor heat exchanger 7 is evaporated (indoor cooling) in the indoor heat exchanger 3 and returns to the four-way valve 2 for circulation.

Next, the portion of the engine 10 that drives the compressor 1 will be described in detail.

FIG. 1 shows the structure of a compressor drive unit according to an embodiment of the present invention. FIG. 1 (a) is a front view and FIG. 1 (b) is a plan view. Similar to the conventional compressor drive device shown in FIG. 5, two compressors 1 a and 1 b having the same capacity are actually driven by the engine 10.

From the pulley 11 directly connected to the crankshaft of the engine 10, the rotational force is transmitted by the belt 13 to the compressors 1a and 1b arranged on both sides of the engine 10, and the electromagnetic clutch 12a is respectively applied to the compressors 1a and 1b. 1
2b is attached, and the basic structure for transmitting and blocking the rotational force transmitted by the belt 13 to the compressors 1a, 1b is the same as the conventional one, but in the present invention, the pulley 11 is further provided with a large diameter portion 11a. A small diameter portion 11b is provided, and both 11a and 11
Both b and b have the same structure.

Further, a large-diameter belt 13a for transmitting the rotational force from the large-diameter portion 11a and a small-diameter belt 13b for transmitting the rotational force from the small-diameter portion 11b are respectively applied to the two compressors 1a and 1b. The compressors 1a and 1b are provided with large-diameter electromagnetic clutches 12a and 12b and small-diameter electromagnetic clutches 12c and 12d that transmit or block the rotational force transmitted from the belts 13a and 13b.

Both electromagnetic clutches 12a, 12b,
12c and 12d are connected in parallel to each other with respect to the rotary shafts of the compressors 1a and 1b, and they are controlled so that both of them are shut off or only one of them is connected to transmit the rotational force.

In the prior art, the refrigerant circulation amount can be changed in two stages depending on whether one compressor 1a or 1b is operated or two compressors are operated. It is possible to change the refrigerant circulation amount in five stages in combination with the selection of whether to drive with the large-diameter pulley 11a or the small-diameter pulley 11b, as shown in the table of FIG. As a result, the refrigerant circulation amount from the compressors 1a and 1b can be varied in multiple stages in accordance with the required compressor capacity according to the air conditioning state on the air conditioner side. If the adjustment based on the number of revolutions of the engine 10 is added to this, it is possible to finely change the refrigerant circulation amount in a wide range.

(Second Embodiment) The structure of the compressor drive unit in the second embodiment is the same as the structure of the compressor drive unit in the first embodiment of FIG. 2 is different
The two compressors 1a and 1b have different capacities.

This is because a compressor with a larger capacity and a compressor with a smaller capacity are added to the combination of the first embodiment, and the refrigerant circulation amount is divided into eight stages by the combination as shown in the table of FIG. It is possible to change. As a result, the refrigerant circulation amount from the compressor can be varied in multiple stages in accordance with the required compressor capacity.

Further, if the engine speed is adjusted, the refrigerant circulation amount can be varied more finely in a wide range.

(Other Embodiments) The present invention is not limited to the above-described embodiments, but can be modified or expanded as follows. In the above embodiment,
Although the heat pump type air conditioner installed outside / inside the house is shown, it may be a heat pump type air conditioner for a vehicle placed inside / outside the passenger compartment of the vehicle, or even a heat pump type air conditioner. Instead, it may be a vapor compression type refrigeration system or the like.

[Brief description of drawings]

FIG. 1A is a front view and FIG. 1B is a plan view showing a configuration of a drive device for a compressor according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a heat pump type air conditioner according to an embodiment of the present invention.

FIG. 3 is a table summarizing a combination for changing the refrigerant circulation amount in the first embodiment of the present invention as compared with a conventional one.

FIG. 4 is a table summarizing combinations for changing the refrigerant circulation amount in the second embodiment of the present invention as compared with the related art.

5 (a) is a front view and FIG. 5 (b) is a plan view showing a configuration of a conventional compressor drive device.

[Explanation of symbols]

1a first compressor 1b Second compressor 10 engine 11 pulley 11a pulley large diameter part 11b Pulley small diameter part 12a, 12b Large diameter electromagnetic clutch 12c, 12d Small diameter electromagnetic clutch 13a Large diameter belt 13b Small diameter belt

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Claims (2)

[Claims] 1. A first and a second compressor (1a, 1b) for compressing and discharging a refrigerant according to the rotation of a rotating shaft, and a first and a second compressor (1a, 1b) respectively provided. And a large-diameter electromagnetic clutch (12a, 12b) and a small-diameter electromagnetic clutch (12c, 12c, 12c, 12b, 12b, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c, 12c being connected in parallel with each other for transmitting or interrupting rotational force to each compressor 1a, 1b.
12d), an engine (10) for driving the first and second compressors (1a, 1b), and large diameter portions (11a) having different diameters for transmitting the rotational force of the engine (10) and A pulley (11) having a small diameter portion (11b), and rotational force from the large diameter portion (11a) are passed through the large diameter electromagnetic clutches (12a, 12b) to the first and second compressors (1a, 1b) Multiple large diameter belts (1
3a) and a plurality of small diameter belts for transmitting the rotational force from the small diameter portion (11b) to the first and second compressors (1a, 1b) via the small diameter electromagnetic clutches (12c, 12d), respectively. (1
3b), and the operation of the large diameter electromagnetic clutches (12a, 12b) and the small diameter electromagnetic clutches (12c, 12d) is controlled as necessary. . 2. The drive device for the compressor according to claim 1, wherein the capacities of the first and second compressors (1a, 1b) are different from each other.