KR920008772Y1 - Rotary compressor - Google Patents

Abstract

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Description

Rotary compressor

1 to 3 show an embodiment of the present invention, and FIG. 1 is a block diagram showing a structure for switching the capability of a rotary compressor, which is a main part, with a refrigeration cycle.

2 is a cross-sectional view showing the structure of a rotary compressor.

3 is a diagram showing the various levels of capability mode.

Figure 4 is a block diagram showing another embodiment of the present invention.

5 is a diagram showing the mode of capability in heating.

6 is a diagram showing the ability mode during cooling.

7 is a cross-sectional view of a rotary compressor, such as a refrigeration cycle, that uses a conventional inverter circuit to switch capabilities.

8 is a diagram showing the noise characteristics accompanying the capacity change.

* Explanation of symbols for the main parts of the drawings

1: rotary compressor 3: motor part (drive source)

4: first compressor part 5: second compressor part

20, 21, 28, 28: Lilly spout, release valve selector valve, release passage (release device)

25, 26: switching valve (suction passage opening and closing device) 33: control circuit (control unit)

The present invention relates to a rotary compressor for driving a refrigeration cycle.

In the air conditioner, a four-way valve (b), an indoor side heat exchanger (c), a capillary tube (d) (decompression device), and an outdoor side exchanger (e) are connected to a rotary cylinder (a) of one cylinder type as shown in FIG. ) Is used in order to form a heating cycle and a cooling cycle by switching the flow path by the four-way valve (b).

By the way, the air conditioner has a rotary compressor (a) capable of varying the capacity to cope with the load.

In the conventional rotary compressor (a), as shown in FIG. 7, the structure in which the inverter circuit (h) is connected to the motor portion (g) provided on the upper end of the sealed case (f) is used to change the power frequency. The rotation speed of the electric motor part g is greatly changed, and the ability of the rotary compressor part i driven by this electric motor part g is changed linearly as shown in FIG.

However, in the inverter circuit (h), the rotary compressor (a) whose capacity is variable as shown in FIG. There is a difficulty.

Therefore, it is very expensive to soundproof or improve the quality of the sliding parts.

In addition, the conversion of the inverter circuit h involves a loss (more than 10%), and the cost of the control part including the inverter circuit h is very expensive.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotary compressor capable of varying the capacity of several stages linearly without using an inverter circuit.

Such a rotary compressor is provided with a rotary first compressor unit 4 having a large-capacity cylinder 8 driven by a drive source 3, and a small capacity driven by the drive source 3 together with the first compressor unit 4. A rotary second compressor part 5 having a cylinder 13 of the first and second compressor parts, respectively, on the suction side of the cylinders 8 and 13 of the first and second compressor parts, respectively. And the release devices 20, 21, 28, 29 are installed in the cylinder 8 of the first compressor section 4, and these release devices 20, 21, 28, 29 are provided. And a control unit 33 for controlling the suction passage opening and closing devices 25 and 26, and the normal operation, the release operation, and the operation of the second compressor part 5 of the first compressor part 4 are provided. To form a multilevel mode of ability.

Hereinafter, the present invention will be described based on one embodiment shown in FIGS. 1 and 2.

1 shows an air conditioner to which the present invention is applied, and "1" is a rotary compressor.

As shown in FIG. 2, the rotary compressor 1 is provided with an electric motor part 3 (corresponding to a driving source) at the upper end of the sealed case 2, and the rotary first compressor part 4 and the second compressor part ( 5) is installed in series.

In detail, the electric motor part 3 is comprised by combining the stator 6 and the rotor 7.

In addition, the first compressor 4 is provided with a cylinder 8 having a large capacity (greater than a cylinder seal) between the main bearing 9 and the intermediate bearing 10, and at the same time the cylinder 8 and the bearing 9 The structure which installs the roller 11 with the blade 12 which enables eccentric rotation in the space enclosed by (10) is used.

The lily port 20 is installed together with the release valve 21 on the circumferential wall of the middle portion of such a large-capacity cylinder 8 compressor, and the release port 20 can discharge the refrigerant during compression. To make it work.

In addition, the second compressor part 5 overlaps the intermediate bearing 10 to install a cylinder 13 of a small capacity (small cylinder chamber) so as to fit the cylinder 13 to install the sub bearing 14. At the same time, a structure in which a roller 15 is provided together with the blades 16 capable of eccentric rotation in a space surrounded by the cylinder 13 and the bearings 10 and 14 is used.

Each of the rollers 11 and 15 of the first and second compressor parts 4 and 5 is connected to the rotor 7 of the motor part 3 through the shift 17 to the motor part 3. Of the angular compressor (4) and (5) by the excitation of the

In addition, the suction pipes 4a and 5a of the angular compressor portions 4 and 5 each independently protrude out of the sealed case 2 and are connected in parallel so that each discharge port 4b and 5b is, for example, It is opened in the sealed case 2 and communicates with the discharge pipe 18 provided on the upper part of the copper sealed case 2. (The discharge paths of the compressor parts 4 and 5 are in parallel.)

In each suction section 4a, 5a of the rotary compressor 1, a switching valve 25, 26 (all composed of an electromagnetic two-way valve and corresponding to a suction passage opening and closing device) is incorporated.

The confluence of the suction pipes 4a and 5a is connected to the four-way valve 27 together with the discharge pipe 18 so as to perform independent compression or parallel discharge by opening / closing operation (switching) of each of the switching valves 25 and 26. I am doing it.

In addition, between the release pot 20 and the upstream portions of the suction pipes 4a and 5a, a release furnace 29 having a switching valve 28 as an electromagnetic two-way valve (release port 20, lily) And a release device together with the isol valve 21) are installed to compress the first compressor unit 4 using the entire cylinder 8 only by the opening / closing operation (switching) of the selector valve 28. It has a structure that can perform normal operation (rated) and a release operation (capacity reduction rate; about 0% -30% of normal operation) to release a part of the refrigerant under compression to the suction side.

The outdoor side heat exchanger 30, the capillary tube 31 (decompression device), and the indoor side heat exchanger 32 are sequentially connected to the four-way valve 27 to which the rotary compressor 1 is connected. It constitutes a refrigeration cycle of the pump.

In addition, "33" is a control circuit (corresponding to a control unit).

Each switching valve 25, 26, 28 is connected to the output side of the control circuit 33 so that the switching control of each switching valve 25, 26, 28 is performed with the first compressor 4 and the first compressor. Combination of two compressor parts 5 "normal operation of the first compressor part 4 + normal operation of the second compressor part 5" "release operation of the first compressor part 4 + second compression Normal operation of the base 5 "," normal operation of the first compressor part 4 "," release operation of the first compressor part 4 "and" normal operation of the second compressor part 5 " It is possible to change the ability in five stages.

Specifically, for example, the second compressor section 5 is set to a suitable small capacity of the mode where the cylinder capacity is the highest in operation rate, and furthermore, the normal of the first and second compressor sections 4 and 5 The sum is set to be a large capacity that satisfies many tasks such as the start of low external temperature, and the release operation is set to the ability to reduce 20% to 30% with respect to normal operation. To form.

Of course, this capability mode allows the control circuit 33 to continuously vary.

However, the capacity mode is provided with a release mechanism on the large-capacity cylinder 8 side, resulting in a capacity variation close to the dull linearity.

Although not shown, the control circuit 33 is provided with a sensor for monitoring room temperature, and has a structure of selecting an operation mode of five stages depending on the load.

When heating with such an air conditioner, the operation part (not shown) is operated by "heating" first.

Then, the four-way valve 27 is switched to the heating side and the room temperature is lowered, so the maximum output is required. Therefore, the selector valves 25 and 26 are turned "ON", and the selector valve 28 is turned "OFF" ( Lungs).

Thereafter, the electric motor unit 3 is excited to drive the first and second compressor units 4 and 5.

As a result, in the rotary compressor 1, operation of the highest capability indicated by " A " is shown in FIG. 3 using all the cylinder volumes of both the first compressor portion 4 and the second compressor portion 5. As shown in FIG.

The refrigerant discharged from the rotary compressor (1) circulates through the four-way valve (27), the indoor side heat exchanger (32), the capillary tube (31), and the outdoor side heat exchanger (30). Configure the heating cycle.

(Normal operation of the first compression base 4 + normal operation of the second compressor unit 5)

Thus, when the heating operation is started and the room temperature rises and the load decreases, the switching valve 28 is turned "ON", and a driving mode with a small capacity as indicated by "B" in FIG. Release operation + normal operation of the second compressor (5) ".

In addition, as the load decreases, the selector valve 28 in the "normal operation of the first compressor part 4" indicated by "C" in FIG. 3 formed by the selector valves 26 and 28 being "OFF". 3 is formed to be "ON", the operation of the release of the first compressor (4) shown in "D" in FIG. 3, only the second compressor (4) shown in "E" in FIG. It becomes the low ability driving to do.

And the ability to vary linearly in multiple stages without the use of inverter circuits.

In addition, "X" in FIG. 3 shows the change characteristic of a capability.

This change in capacity does not significantly increase (change) the number of revolutions of the motor unit 3, and as shown by "Y" in FIG. 3, the noise level is constant regardless of the capacity characteristic, and thus, when the inverter circuit is used. Likewise, noise is not increased.

In addition, the vibration is not increased for the same reason, so that the cost of sound insulation and quality improvement of the sliding parts can be eliminated, and the cost can be drastically reduced while not using an inverter circuit.

In addition, since there is no loss in converting the inverter circuit, and the operation mode with the longest operation time is used as the single operation using the small-capacity cylinder 13, high efficiency operation can be realized, and a significant energy saving operation can be realized.

This is of course the same in the cooling operation.

In addition, about the cooling operation, since the flow path is switched by the four-way valve 27 and the cooling cycle is configured, the description thereof will be omitted.

4 to 6 show another embodiment.

This is a change in the capacity ratio between cooling and heating.

That is, the cylinder capacity of the first compressor unit 4 is set to "100", the cylinder capacity of the second compressor unit 5 is set to "40", and the cylinder capacity of the release of the first compressor unit 4 is set to "40". When it is set to "75", at the time of heating operation, "normal operation of the first compressor part 4 + normal operation of the second compressor part 5" "normal operation of the first compressor part 4", As in "Normal operation of the extruder unit 5," three stages of capacity change (capacity ratio%; 100: 40: 40) are carried out, and during cooling operation, the "release operation of the first compressor unit 4 + Capacity change in each of three stages of normal operation of the second compressor part 5, release operation of the first compressor part 4, and normal operation of the second compressor part 5 (capacity ratio% ), 115: 75: 40).

Specifically, the outlet side of the release furnace 29 (there is no switching valve 28) is connected between the four-way valve 27 and the indoor side heat exchanger 32 to include the release furnace 29. The lily isoport 20 is opened automatically only during the cooling operation to become the low pressure side.

In addition, since the high pressure is applied to the release port 20 during the heating operation, the normal operation is performed.

Of course, as in the above-described embodiment, the switching control of the capability is performed in the control circuit 33.

This structure has the advantage that it is possible to set the rated capacity according to the load of cooling and heating by changing the capacity ratio by heating and cooling while changing the capacity without using an inverter circuit.

As shown by the dashed-dotted line only, when the three-way valve 40 is provided at the connection portion of the release furnace 29, five stages of capacity change are possible.

In FIG. 4, the same components and parts as those described in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

As described so far, according to the present invention, a combination of the normal operation of the first compressor unit, the same release operation, and the operation of the second compressor unit can perform linear multi-stage capacity change without using an inverter circuit.

Therefore, it does not increase the number of revolutions greatly when the capacity is changed, so it can reduce the cost of sound insulation, improve the quality of sliding parts, and can significantly reduce the cost as well as not using the inverter circuit. .

In addition, since there is no loss associated with the conversion of the inverter circuit, it is possible to achieve high efficiency operation and improve energy saving operation.

Claims (2)

In the variable rotation rotary compressor having a drive unit (3) and a compression unit driven by the drive unit to release the refrigerant gas in the cylinder, the first rotary compressor unit (4) having a cylinder of a first capacity and the first A compression section composed of a second rotary compressor section 5 having a cylinder of a second capacity smaller than one capacity, and provided on the suction side of each cylinder of the first and second rotary voltage accumulator sections 4 and 5; Suction passage opening and closing device (25) (26) for opening and closing the suction passage and the release device (20) (21) for releasing the refrigerant gas in the compression process in the cylinder of the first rotary compressor (4) ( 28. A rotary compressor comprising: (29), and a control unit (33) for controlling the release device and the suction passage opening and closing device to variably control the capabilities of the first and second compressor sections. The rotary compressor according to claim 1, wherein the first and second compressor parts (4) (5) are installed in the same sealed case (2) and driven by a common driving part (3).