KR20060013223A - Capacity variable type rotary compressor and driving method thereof and driving method for airconditioner with this - Google Patents

Abstract

The present invention relates to a variable volume rotary compressor, a method of operating the same, and a method of operating an air conditioner using the same. By connecting to the bypass hole opening and closing, by increasing the refrigeration capacity reduction rate during the variable volume operation of the compressor to enable a variety of control of the air conditioning, it is possible to reduce the unnecessary power consumption of the compressor and the air conditioning employing it.

In addition, by using the low-cost and reliable pilot valve, the back pressure of the sliding valve can be changed quickly and accurately, which can be widely applied to compressors or air conditioners having frequent refrigeration capacity control functions, as well as compressors or air conditioners employing the same. The whole efficiency fall can be prevented beforehand.

Description

Variable volume rotary compressor and its operation method and method of operating air conditioner using it {CAPACITY VARIABLE TYPE ROTARY COMPRESSOR AND DRIVING METHOD THEREOF AND DRIVING METHOD FOR AIRCONDITIONER WITH THIS}

1 is a system diagram of an air conditioner having a variable displacement rotary compressor of the present invention;

Figure 2 is a "II-II" cross-sectional view of Figure 3 showing an example of the present invention variable displacement rotary compressor;

3 is a cross-sectional view taken along line "I-I" of FIG.

Figure 4a is an operation diagram showing a power operation process in the variable displacement rotary compressor of the present invention,

Figure 4b is an operation showing a saving operation process in the variable displacement rotary compressor of the present invention,

5 and 6 are a schematic view and a flow chart showing an operation of the air conditioner employing the variable displacement rotary compressor of the present invention;

7 is a sectional view taken along line “I-I” of FIG. 2 showing another embodiment of the variable displacement rotary compressor of the present invention;

8a is an operation diagram showing a power operation process in another embodiment of the variable displacement rotary compressor of the present invention;

8b is an operation diagram showing a middle operation process in another embodiment of the variable displacement rotary compressor of the present invention;

9 and 10 are a schematic view and a flowchart showing a driving mode of the air conditioner employing the present invention variable displacement rotary compressor,

11 is a partial cross-sectional view showing a modification of the bypass hole in the variable displacement rotary compressor of the present invention.

** Description of symbols for the main parts of the drawing **

1: casing 2: condenser

3: expansion mechanism 4: evaporator

5: accumulator 10: cylinder

11: vaneslit 12: suction port

13: gas guide groove 14: communication hole

20: main bearing plate 21: bearing hole

22: first discharge port 23: first muffler

30: sub bearing 31: bearing hole

32: second discharge port 33: second muffler

34: bypass hole 35: valve hole

35a: back pressure through hole 40: rotating shaft

41: eccentric 50: rolling piston

60: vane 71, 72: first and second discharge valve

80: volume change unit 81: sliding valve

81a: first compression unit 81b: second compression unit

81c: communicating part 82: valve spring

90: back pressure switching unit 91: switching valve assembly

92: first connector 93: second connector

94: switching valve housing 94a: high-pressure side inlet

94b: low-pressure side inlet 94c: first outlet

94d: second outlet 95: switching valve

96: electromagnet 97: switching valve spring

SP: Gas suction pipe DP: Gasoline discharge pipe

The present invention relates to a variable displacement rotary compressor, and more particularly, to a variable displacement rotary compressor, a method of operating the same, and a method of operating an air conditioner using the same to exhaust the refrigerant gas in a compression chamber to adjust cooling power.

In general, a rotary compressor is mainly applied to an air conditioner such as an air conditioner. Recently, as the function of the air conditioner is diversified, the rotary compressor also requires a product that can vary in capacity.

As a technique for varying the capacity of a rotary compressor, a so-called inverter method that controls the number of revolutions of the compressor by using an inverter motor is mainly known, but this technique is expensive because the inverter motor itself is expensive, and most of the air conditioners are statistically Considering that it is used as a cooler, it is difficult to increase the refrigerating capacity under heating conditions, which is more difficult in the cooling conditions, which is more important in the air conditioner compressor.

Accordingly, in recent years, the so-called "refrigeration capacity change technology" by changing the volume of the compression chamber by bypassing part of the refrigerant gas compressed in the cylinder to the outside of the cylinder (hereinafter referred to as "exchange volume switching"). Abbreviated as technology) is widely known.

However, most of the capacity-variable compressors based on the exclusion-volume switching technology known up to now allow refrigerant gas to be bypassed through the valve to increase the resistance of the bypass circuit, resulting in a decrease in the freezing capacity during the volume exclusion operation. There was a problem of only ~ 85%.

In addition, there was a limitation in applying to a compressor or an air conditioner that requires frequent refrigeration capacity control function because it could not switch the operation mode quickly.

The present invention has been made in view of the problems of the conventional rotary compressor as described above, to increase the refrigeration capacity reduction rate during volume exclusion operation to enable various control of the air conditioner, as well as the capacity to prevent unnecessary power consumption in advance. An object of the present invention is to provide a variable rotary compressor, a method of driving the same, and a method of operating an air conditioner using the same.

Another object of the present invention is to provide a variable capacity rotary compressor, a method of operating the same, and a method of operating the air conditioner, which can be applied to a compressor or an air conditioner having a frequent refrigeration capacity control function so that the operation mode can be switched quickly. There is this.

In order to achieve the object of the present invention, a casing having a gas suction pipe communicating with the evaporator and a gaseous discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder which forms vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber and is fixedly installed in the casing; The upper and lower sides of the cylinder are covered to form an inner space together, and the discharge ports for discharging the compressed refrigerant by communicating with the inner space of the cylinder are formed on the same axis line, and are connected to one discharge port to communicate with the suction port of the cylinder. A plurality of bearing plates forming a pass hole; A plurality of discharge valves provided on the front end surface of each discharge port to open and close the discharge ports of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; It provides a variable displacement rotary compressor comprising a; back pressure switching unit for differentially supplying back pressure to the volume variable unit to open and close the bypass hole according to the operation mode of the compressor.

A casing further includes a gas suction pipe communicating with the evaporator and a gas discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder which forms vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber and is fixedly installed in the casing; The upper and lower sides of the cylinder are covered together to form an inner space, and the discharge ports for discharging the compressed refrigerant by communicating with the inner space of the cylinder are formed on different axes, and are connected to one discharge port to communicate with the suction port of the cylinder. A plurality of bearing plates forming a pass hole; A plurality of discharge valves provided on the front end surface of each discharge port to open and close the discharge ports of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; It provides a variable displacement rotary compressor comprising a; back pressure switching unit for differentially supplying back pressure to the volume variable unit to open and close the bypass hole in accordance with the operation mode of the compressor.

Such a compressor includes: a power operation mode in which the volume variable unit operates in a state in which the bypass hole blocks the bypass hole at the start of the compressor, thereby producing maximum capacity; When the power operation mode is in progress, the control unit calculates the proper freezing capacity of the compressor, and when the freezing capacity needs to be lowered, the back pressure switching unit is operated so that the volume-variable unit opens the bypass hole so that the entire compressed refrigerant of the cylinder is removed from the inlet port. Shaving operation mode to ensure that; Provided is a method of operating the variable displacement rotary compressor of claim 1 or 3, characterized in that it performs crossover.

Or a middle operation mode in which a bypass hole is opened by the volume variable unit when the compressor is started so that a part of the compressed refrigerant of the cylinder is excluded as an intake port; A power operation mode in which the back pressure switching unit is operated after the middle operation mode has been performed for a predetermined time to operate in a state in which the volume variable unit blocks the bypass hole to achieve maximum capability; While the power operation mode is in progress, the control unit calculates the proper freezing capacity of the compressor, and when the freezing capacity needs to be lowered, the back pressure switching unit is operated in reverse, so that the volume variable unit opens the bypass hole so that a part of the compressed refrigerant of the cylinder goes to the intake port. The middle driving mode to be excluded; Provided is a method of operating the variable displacement rotary compressor of claim 2 or 4, characterized in that the crossover is performed.

In the air conditioner having such a rotary compressor, when the power is applied, the room temperature is compared with the set temperature (A). When the room temperature is higher than the set temperature (A), the volume change unit of the compressor is in communication with the inner space of the cylinder. A maximum cooling mode for operating at a state in which the bypass hole is blocked to produce maximum capacity; During the maximum cold power mode, the indoor temperature and the set temperature (A) are compared, and if the room temperature is higher than the set temperature (A), the maximum cold power mode is continuously performed while the lower temperature is lower than the set temperature (A). A minimum cooling mode in which the bypass hole is opened so that the entire compressed refrigerant in the cylinder internal space is excluded as the suction port; Comparing the indoor temperature and the set temperature (B) while the minimum cold power mode is in progress, and if the room temperature is lower than the set temperature (B), the power is turned off (OFF) to stop the compressor; It provides a method of operating an air conditioner having a variable displacement rotary compressor of claim 1 and claim 3.

Alternatively, if the room temperature is higher than the set temperature (A) while the power is applied and the room temperature is higher than the set temperature (A), the volume change unit of the compressor opens the bypass hole communicating with the inner space of the cylinder. An intermediate cold force mode for excluding a part of the compressed refrigerant therein into the suction port; While operating in the medium cold power mode, when the room temperature is higher than the set temperature (A) by comparing the room temperature with the set temperature (A), the volume variable unit blocks the bypass hole communicating with the inner space of the cylinder. The maximum cold power mode for driving at maximum capacity; An intermediate cold mode in which the indoor temperature is lower than the set temperature A while the maximum cold power mode is performed, and when the indoor temperature is lower than the set temperature A, the bypass hole is opened to operate while excluding a part of the compressed gas; Comparing the room temperature and the set temperature (B) while the intermediate cold mode is in progress, and when the room temperature is lower than the set temperature (B), the power is turned off (OFF) to stop the compressor; It provides a method of operating an air conditioner having a variable displacement rotary compressor of claim 1 and claim 3 or claim 2 and claim 4.

Hereinafter, a variable displacement rotary compressor according to the present invention, a driving method thereof, and a driving method of the air conditioner using the same will be described in detail with reference to an embodiment shown in the accompanying drawings.

1 is a system diagram of an air conditioner having a variable displacement rotary compressor of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 3 showing an example of the variable displacement rotary compressor of the present invention, and FIG. I "is a sectional view, and FIGS. 4A and 4B are operation diagrams showing a power operation and a saving operation process in the variable displacement rotary compressor of the present invention, and FIG. 5 and FIG. 6 are operational aspects of an air conditioner employing the variable displacement rotary compressor of the present invention. 7 is a sectional view taken along line “I-I” of FIG. 2 showing another embodiment of the present invention of a variable displacement rotary compressor, and FIGS. 8A and 8B are another embodiment of the present invention. 9 is a schematic view showing a driving mode of the air conditioner employing the variable displacement rotary compressor of the present invention.

As shown in FIGS. 1 to 3, the rotary compressor according to the present invention includes a casing 1 for communicating gas suction pipes SP and gas discharge pipes DP, and an upper side of the casing 1 for rotational force. And a compressor mechanism for compressing the refrigerant with the rotational force generated in the power mechanism and installed at the lower side of the casing 1.

The electric drive unit rotates while interacting with the stator Ms by fixing the inside of the casing 1 to stator Ms for applying power from the outside, and having a predetermined gap inside the stator Ms. It consists of electrons (Mr).

The compression mechanism is formed in an annular shape and the cylinder 10 installed in the casing 1 and the main bearing plate (hereinafter, abbreviated as main bearing) which cover the upper and lower sides of the cylinder 10 to form an inner space V together. 20) and the sub-bearing plate (hereinafter abbreviated as sub-bearing) 30, the rotating shaft is pressed into the rotor (Mr) and supported by the main bearing 20 and the sub-bearing 30 to transmit the rotational force 40 and a rolling piston 50 rotatably coupled to the eccentric portion 41 of the rotating shaft 40 to compress the refrigerant while turning in the inner space of the cylinder 10, and on the outer circumferential surface of the rolling piston 50. The vane 60 and the main bearing 20 and the sub-bearing are respectively provided in the main bearing 20 and the sub-bearing to be coupled to the cylinder 10 so as to be squeezed in a radially movable manner to partition the inner space V of the cylinder 10 into the suction chamber and the compression chamber. Coupled to the ends of the first discharge port 22 and the second discharge port 32 so as to be opened and closed It comprises a first discharge valve 71 and the second discharge valve (72).

In addition, the compression mechanism is provided on one side of the sub-bearing 10 and connected to the volume variable unit 80 and the volume variable unit 80 for varying the compression chamber capacity, and the pressure difference according to the operation mode of the compressor described above. It further comprises a back pressure switching unit 90 for operating the volume variable unit (80).

The cylinder 10 is formed in an annular shape so that the rolling piston 50 can perform a relative movement, as shown in Figures 1 to 3, the vane (60) can be linearly moved in a radial direction on one side thereof. The vane slit 11 is formed in a linear manner, and one side of the vane slit 11 radially penetrates the inlet 12 communicating with the gas suction pipe SP, while the other side of the vane slit 11 is formed as described above. The first gas guide groove 13 and the second gas guide groove communicate with the first discharge port 22 and the second discharge port 32 of the main bearing 20 and the sub bearing 30 to guide the discharge of the refrigerant gas. 13b), and to communicate with the suction port 12 downward in the axial direction of the suction port 12 to guide the refrigerant passing through the bypass hole 34 to be described later into the internal space V of the cylinder 10. The communication hole 14 formed through is formed.

The main bearing 20 is formed in the shape of a disk having a bearing hole 22 supporting the rotating shaft 40 radially in the center thereof, and the one side of the vane slit 11 of the cylinder 10, that is, the maximum pressure angle. The first muffler 22 is formed at a point approximately 345 ° in the rotational direction of the rolling piston 50 with respect to the vane slit 11 and has a resonance chamber to accommodate the first outlet 22. (23) is fixedly installed on the upper surface of the main bearing (20).

The sub-bearing 30 is formed in the shape of a disc having a bearing hole 32 radially supporting the rotating shaft 40 at the center thereof, and the one side of the vane slit 11 of the cylinder 10, that is, the maximum pressure angle. The second discharge port 32 is formed at a point approximately 345 ° in the rotational direction of the rolling piston 50 with respect to the vane slit 11, and the communication hole 14 of the second discharge port 32 and the cylinder 10 is formed. A second muffler 33 having a resonance chamber is fixedly installed on the bottom surface of the sub bearing 30 so as to accommodate the space. Here, the second discharge port 32 and the communication hole 14 of the cylinder 10 are connected to the bottom of the sub-bearing 30, and the predetermined hole is formed to form the bypass hole 34 together with the second muffler 33. It is preferable to form a gas flow path (mixed with the bypass hole) at a depth.

The second discharge port 32 may be formed in a straight line to axially coincide with the first discharge port 22 as shown in FIG. 3, but in some cases, the cylinder pressure at the inlet end thereof may be cascaded as shown in FIG. 4. 1) Approximately 170-200 ° (more precisely, 180-190 °) in a position where the pressure is lower than the internal pressure, that is, in the direction of the suction port 12 (ie, the rotational direction of the rolling piston) with respect to the vaneslit 11 It is preferable to form the inside, because the freezing capacity can be varied by about 50% during the saving operation.

The second discharge port 32 may be formed to have the same diameter as the first discharge port 22, but in some cases, the second discharge port 32 may be wider than the first discharge port 22 so that the second discharge valve 71 may be easily opened. Do.

In addition, at one side of the sub-bearing 30, that is, at a position perpendicular to the inlet 12 of the cylinder 10, the valve hole 35 is inserted so as to slide the sliding valve 81 of the volume variable unit 80 to be described later. In the plane projection it is formed in a direction orthogonal to the above-mentioned suction port 12.

The valve hole 35 is formed with a groove at a predetermined depth on one side outer circumferential surface of the sub bearing 30, and supports one end of the valve spring 82 to be described later on the side surface, or the first pressure portion 81a of the sliding valve 81. It is formed as a wall surface to support the rear surface, and the other end is opened, and the valve stopper 83 is press-fitted to support the rear surface of the second pressure part 81b of the sliding valve 81 to be described later.

Here, the first sliding pipe 92 and the second connecting pipe 93 of the back pressure switching unit 90, which will be described later, are connected to the center of the wall surface of the valve hole 35 and the valve stopper 83, respectively. A first back pressure through hole 35a and a second back pressure through hole 83a for supplying a high pressure or low pressure atmosphere to the valve 81 are respectively formed.

Although the first discharge valve 71 and the second discharge valve 72 may have the same elastic modulus, in some cases, the elastic modulus of the second discharge valve 72 may be the elastic modulus of the first discharge valve 71. It is preferable to form smaller so that the second discharge valve 72 can be easily opened to quickly bypass the compressed refrigerant.

The volume variable unit 80 slides into the valve hole 35 as shown in FIGS. 3 to 4 b and moves in the valve hole 35 according to the pressure difference by the back pressure switching unit 90. At least the sliding valve 81 for opening and closing the bypass hole 34 and the sliding valve 81 are elastically supported so that the sliding valve 81 moves to a close position when the pressure difference between both ends is the same. One valve spring 82 and a valve stopper 83 for shielding the valve hole 35 to prevent the sliding valve 82 from being separated.

The sliding valve 81 is formed to be in sliding contact with the inner circumferential surface of the valve hole 35 and is located on the wall surface side of the valve hole 35 to receive pressure from the back pressure switching unit 90 to receive the bypass hole 35. The second pressure part 81a which is opened and closed to be in sliding contact with the inner circumferential surface of the valve hole 35 and positioned on the valve stopper 83 side and receives the pressure from the back pressure switching unit 90 described above ( 81b and a communicating portion 81c which connects the two pressure portions 81a and 81b and forms a gas passage so as to communicate with the bypass hole 34 between the outer circumferential surface and the valve hole 35.

The first pressure portion 81a is formed to be longer than the diameter of the bypass hole 34, and the spring fixing groove 81d is formed to insert and fix the valve spring 82 inward from the rear end thereof. It is desirable to minimize the length of.

The back pressure switching unit 90 communicates with the gas suction pipe SP and the gas discharge pipe DP, respectively, and connects the gas suction pipe SP and the gas discharge pipe DP to both sides of the volume variable unit 80 so as to cross each other. A first connecting pipe 92 connecting the pressure switching valve assembly 91 and the first outlet 94c of the pressure switching valve assembly 91 to the first pressure part 81a of the volume change unit 80; It consists of a 2nd connection pipe 93 which connects the 2nd outlet 94d of the pressure switching valve assembly 91 to the 2nd pressure part 81b side of the volume changeable unit 80. As shown in FIG.

The switching valve assembly 91 has a low pressure side inlet 94a for connecting the gas suction pipe SP, a high pressure side inlet 94b for connecting the gas discharge pipe DP, and a first connecting pipe 92 for connecting the gas suction pipe SP. The low-pressure side inlet described above by slidingly coupling the switching valve housing 94 that forms the second outlet 94d connecting the outlet 94c and the second connecting pipe 93 to the inside of the switching valve housing 94. 94a and the first outlet 94c and the high pressure side inlet 94b and the second outlet 94d or the low pressure side inlet 94a and the second outlet 94d and the high pressure side inlet 94b and the first outlet ( A switching valve 95 for selectively connecting 94c, an electromagnet 96 for moving the switching valve 95 by an applied power source by being installed on one side of the switching valve housing 94, and an electromagnet 96 When switching off the power applied to the switch valve (97) made of a compression spring to restore the above-mentioned switching valve (95).

The electromagnet 96 is preferably as small as possible, and it is desirable to select a specification with a power consumption of approximately 15 Watt / Hour or less, because it can increase the reliability, reduce the cost, and reduce the electric consumption.

In the drawings, reference numeral 2 denotes a condenser, 3 an expansion mechanism, 4 an evaporator, 5 an accumulator, 6 a condenser blower fan, 7 an evaporator blower fan, 113 a valve stopper, and 114 a plug.

The present invention variable capacity rotary compressor as described above has the following effects.

That is, when the power is applied to the power mechanism, the rotating shaft 40 rotates, and the rolling piston 50 forms a volume between the vanes 60 while rotating in the inner space V of the cylinder 10. The refrigerant is sucked and compressed, and then discharged into the casing (1). The refrigerant gas is blown into the condenser (2) of the refrigeration cycle apparatus by blowing the gas discharge pipe (DP) into the expansion mechanism (3) and the evaporator (4). After passing through in sequence and repeats a series of processes to be sucked back into the inner space (V) of the cylinder 10 through the gas suction pipe (SP).

Here, the variable volume compressor performs a saving operation or a power operation according to the operating state of the air conditioner employing the same, which will be described in more detail as follows.

First, in the power operation, as shown in FIG. 4A, the power is turned on to the electromagnet 96 of the back pressure switching unit 90, which is a pilot valve, so that the switching valve 95 overcomes the elastic force of the switching valve spring 97 and moves. The high pressure side inlet 94a and the first connection tube 93 communicate with each other while the low pressure side inlet 94b and the second connection tube 93 communicate with each other. Thus, the high-pressure refrigerant gas discharged from the gas discharge pipe DP is introduced into the first pressure part 81a of the sliding valve 81 through the first connection pipe 92 while being sucked into the gas suction pipe SP. The low pressure refrigerant gas is introduced into the second pressure part 81b of the sliding valve 81 through the second connecting pipe 93 so that the sliding valve 81 moves toward the second pressure part 81b. The pressure portion 81a blocks the bypass hole 34.

At this time, the compressed gas compressed in the inner space V of the cylinder 10 overcomes the first discharge valve 71 and the second discharge valve 72 and respectively opens the first discharge port 22 and the second discharge port 32. Passed through the first muffler 23 and the second muffler 33 is discharged, the compressed gas discharged to the second muffler 33 of the bypass valve 34 is blocked by the sliding valve 81 Accordingly, only a short time is discharged only at the beginning of operation, and no longer discharged, so all the compressed gas is discharged into the casing 1 through the first discharge port 22 and moved to the condenser 2.

The operation of the valve spring 82 is performed even when the back pressure switching unit 90 is not operated in consideration of the fact that the pressure in the first connection pipe 92 and the second connection pipe 93 forms an equilibrium pressure when the operation is started. Only the elastic force of the first pressure portion 81a of the sliding valve 81 can block the bypass hole 34 so that the above-described power operation mode can be achieved.

Next, in the saving operation, the power is turned off to the electromagnet 96 of the back pressure switching unit 90, which is a pilot valve, so that the switching valve 95 is moved by the restoring force of the switching valve spring 97. The high pressure side inlet 94a and the second connection tube 93 communicate with each other while the low pressure side inlet 94b and the first connection tube 92 communicate with each other. Thus, the high-pressure refrigerant gas discharged from the gas discharge pipe DP is introduced into the second pressure part 81b of the sliding valve 81 through the second connecting pipe 93 while being sucked into the gas suction pipe SP. The low pressure refrigerant gas is introduced into the first pressure part 81a of the sliding valve 81 through the first connecting pipe 92 so that the sliding valve 81 overcomes the elastic force of the valve spring 82 and the first pressure part. The bypass hole 34 meets and communicates with the communication portion 81c of the sliding valve 81 while moving toward 81a.

At this time, the compressed gas discharged to the second muffler 33 passes through the bypass hole 34 and communicates with the suction port 12 so that the second muffler 33 has a relatively low pressure than the first muffler 23. As a result, the refrigerant gas discharged from the cylinder 10 is discharged only toward the second discharge port 32 having a relatively low pressure, and thus the compressor hardly compresses.

The rotary compressor including the variable volume device of the present invention as described above operates as shown in FIG.

That is, at the time of starting the compressor, the sliding valve 81 of the volume variable unit 80 operates in a state in which the bypass hole 34 of the sub bearing 30 is blocked by the valve spring 82 to achieve the maximum capacity. Perform the power operation mode.

Next, when it is necessary to lower the freezing capacity by calculating the proper freezing capacity of the compressor while the power operation mode is in progress, the back pressure switching unit 90 is operated to operate the high pressure side inlet 94a and the first connection pipe 92. The high pressure refrigerant gas is supplied to the low pressure side inlet 94b and the second connecting pipe 93 to supply the low pressure refrigerant gas to the bypass valve 81 of the volume variable unit 80. A saving operation mode is performed in which the hole 34 is opened so that the entire compressed refrigerant of the cylinder 10 is removed to the inlet 12.

Here, if the shaving operation is continued for a long time (usually 1 minute or more), there is no difference between the high and low pressures in the system, so that the sliding valve 81 is switched and intentionally power operation cannot be performed. In other words, since the minimum pressure difference required between the high pressure side and the low pressure side is eliminated, switching from the saving operation to the power operation is not made, so the saving operation is determined according to the operating conditions, or the longest time is determined or the condenser 2 and the evaporator 4 Although it is preferable to determine by temperature or a temperature difference, or using the method of detecting a high and low pressure, it is usually most economical to determine using the temperature and temperature difference of the condenser 2 and the evaporator 4.

The air conditioner to which the variable volume rotary compressor according to the present invention is applied may operate as shown in FIG. 7.

First, a maximum cold power operation (power operation) is performed in which the compressor exhibits the maximum capability by comparing the room temperature with the set temperature A while applying power. That is, when the indoor temperature is detected and compared with the set temperature (A), and when the indoor temperature is higher than the set temperature (A), the back pressure switching unit (90) is adjusted so that the volume variable unit (80) has a bypass hole (34). Let the compressor run with the) off.

At this time, compare the indoor temperature and the set temperature (A) before starting with the maximum cooling operation, determine the total refrigeration capacity of the compressor according to the temperature difference and operate accordingly, thereby variously adjusting the cooling capacity of the air conditioner It can increase the power consumption and prevent unnecessary power waste.

Next, the maximum cold power operation is performed while the indoor temperature is compared with the set temperature (A). If the room temperature is higher than the set temperature (A), the maximum cold power operation is continuously performed while the lower pressure is lower than the set temperature (A). By adjusting the switching unit 90 to allow the variable volume unit 80 to open the bypass hole 34, through which the entire refrigerant gas compressed in the cylinder 10 is excluded to the inlet 12, the refrigeration capacity of the compressor To perform the minimum cold power operation (saving operation) to the zero (zero) state.

Here, the air conditioner controls the refrigerating capacity by feeding back the room temperature in a relatively short time, for example, in the range of 3 minutes. The minimum cold power operation is generally performed for more than 1 minute, so that the high and low pressure difference of the system disappears, and the sliding valve 81 of the compressor It is not possible to intentionally switch to maximum cold power operation by switching. Therefore, as in the operation method of the compressor, the minimum cold power operation time is determined by the maximum time according to the operating conditions, the temperature or the temperature difference between the condenser and the evaporator, or the proper time is determined by means of detecting the high and low pressure. Preferably, in the saving operation of the compressor having the minimum minimum cold power operation, it is preferable to limit the operation time to 30-40% or less of the power operation time so that the required minimum pressure difference exists between the high pressure side and the low pressure side.

For example, in the rotary compressor equipped with the variable capacity device of this embodiment, since the freezing capacity is zero, if the total refrigeration capacity of the compressor is 40%, the power operation is performed by 0.4 x time (t) for 3 minutes. Drive and save for 0.6x time (t). At this time, the shaving operation can not be more than 1 minute, so the power operation is 0.4 minutes and the shaving operation is performed for 1 minute to frequently change the series of operations controlling the compressor's ability to optimize the operation of the air conditioner. It is possible to minimize the power consumption by stopping the compressor during this saving operation.

On the other hand, if there is another embodiment according to the present invention.

That is, in the above-described embodiment, the plurality of discharge ports 22 and 32 are arranged on the same axis line so that the operation of the compressor is performed in the power operation mode (cold power; 100% operation) and the saving operation mode (cold power; 0% operation). Operation is divided into two stages, and the air conditioner is also divided into maximum cold power operation (compressor power operation) and minimum cold operation (compressor saving operation). In order to obtain the optimum air conditioning effect while adjusting the operation time of the operation, the present embodiment, as shown in Fig. 7, the first discharge port 22 and the second discharge port 32 at predetermined intervals on different axes To form.

In this case, the power operation mode in which the bypass hole 34 is closed is operated similarly to the case where the bypass hole 34 is on the same axis. However, when the bypass hole 34 is opened, a part of the refrigerant gas is excluded through the second discharge port 32 and the remaining refrigerant gas is still moved toward the first discharge port 22 by the rolling piston 50. Since the compressor is further compressed and discharged, the compressor operates at a capacity of about 50% of the maximum operation (that is, the power operation mode). This can simplify the compressor structure in the same configuration while lowering the capacity of the compressor by approximately 50%, thereby performing various operating modes as well as increasing the compressor efficiency.

When the plurality of discharge ports are arranged on different axis lines as described above, the operation of the compressor can be started in the middle operation mode which can lower the starting load.

For example, as shown in FIG. 8A, a valve spring 82 supporting the sliding valve 81 is disposed on the rear surface of the second compression unit 81b so that the high pressure side and the low pressure side are balanced when the compressor is stopped. By allowing the 81 to move to the right side of the drawing by the elastic force of the valve spring 82, the communication portion 81c of the sliding valve 81 is placed at a position overlapping the bypass hole 34. will be. When the compressor is started in this state, part of the compressed refrigerant leaks into the bypass hole 34 through the second outlet 32, and the rest is compressed as it is and discharged into the casing 1 through the first outlet 22. The compressor will then start in middle operating mode.

Next, by operating the back pressure switching unit 90 in reverse as shown in Figure 8b so that the high-pressure refrigerant gas is supplied to the back of the first compression unit 81a of the sliding valve 81 through the first connecting pipe 92, As the sliding valve 81 moves to the left side of the drawing, the first compression section 81a closes the bypass hole 34 so that all the compressed refrigerant of the cylinder 10 passes through the first discharge port 22 and the casing 1 Is discharged to) to operate in power operation mode.

Next, the compressor operation as shown in FIG. 9 is continued while repeating the process of switching to the middle operation mode and then switching to the power operation mode after a predetermined time (within 1 minute) as described above.

As described above, the air conditioner employing the variable volume rotary compressor that arranges the plurality of discharge ports at different positions is operated as follows.

That is, the middle operation mode in which the driving is performed while the power is applied and the part of the compressed gas inside the cylinder is excluded as the bypass hole 34 for a predetermined time is performed.

Next, when the indoor temperature is compared with the set temperature (A) and the indoor temperature is higher than the set temperature (A), the sliding valve 81 of the volume variable unit 80 blocked the bypass hole 34. Perform maximum cold power operation (power operation) to operate at maximum.

Next, when the indoor temperature is lower than the set temperature (A) while the maximum operating mode is performed, if the room temperature is lower than the set temperature (A), the bypass hole 34 is opened to operate while excluding a part of the compressed gas. Perform middle cold power operation. At this time, if the indoor temperature is lower than the set temperature (A) during the middle operation, the indoor temperature is higher than the set temperature (B). If it is less than), stop the compressor.

Next, while the middle operation mode is in progress, the room temperature is compared with the set temperature (B), and if the room temperature is lower than the set temperature (B), the power is turned off (OFF) to stop the compressor.

Here, before performing the power operation or the middle operation, by comparing the room temperature and the set temperature (A) and determining the total refrigeration capacity of the required compressor according to the temperature difference and operating accordingly, the air-conditioning capacity of the air conditioner is varied. By adjusting the air conditioner efficiency can be increased and unnecessary power consumption can be prevented in advance. For example, if the total refrigeration capacity of the compressor is to be 20%, the power operation may be performed for 0.2 x time (t) and the middle operation for 0.8 x time (t) for a time t three minutes.

In addition, as the middle cold power operation is performed along with starting, the compressor can be easily started by lowering the pressure load, and the compressor can be operated even when the pressure balance between the high pressure side and the low pressure side is less than that. can do.

In addition, it is possible not only to reduce the compressor vibration generated at the start, but also to prevent the reverse rotation of the rotating shaft caused by the backflow of the compressed gas, thereby increasing the reliability of the compressor.

Also, in the present embodiment, when the refrigeration capacity of the compressor is excessively large in the middle operation, the air conditioning can be optimized while stopping the compressor and frequently switching the stop and the middle operation.

On the other hand, in the variable volume rotary compressor according to the present invention, the second discharge port 32 may be formed in the second sub-bearing 30, but in some cases, may penetrate from the inner circumferential surface of the cylinder 110 to the outer circumferential surface.

That is, as shown in FIG. 11, the second discharge port 111 is formed to bypass a part of the refrigerant gas on one main surface of the cylinder 110, and the main bearing 120 covering the upper surface of the cylinder 110 is formed on the second bearing port 111. A first discharge port (not shown) is formed, and the sub bearing 130 covering the bottom surface of the cylinder 110 communicates with the above-described second discharge port 111 so that the second discharge port 111 is the suction port of the cylinder 110. Bypass holes 132 are formed to communicate with each other (not shown).

In this case, the diameter of the second discharge port 111 or the elastic modulus of the second discharge valve 112 preferably applies the above-described embodiment.

In addition, while the discharge valve (not shown) for opening and closing the first discharge port is a lead-type valve fixed at one end, the second discharge valve 112 is formed as a plate-shaped valve to be opened and closed while sliding, but the cylinder 110 for this purpose The other valve hole 110a is formed to penetrate in the radial direction so as to communicate with the second discharge port 111.

In this way, it is provided with a plurality of discharge ports and discharge valves, one of which is configured to change the position angle freely, by setting the refrigeration capacity in the capacity reduction mode between 0% to 100% arbitrarily to meet various conditions Air conditioning can be performed.

In addition, by installing a small, low power consumption and highly reliable pilot valve, the operation mode is changed actively while operating the capacity changer in the compressor, thereby increasing the comfort of the machine and optimal air conditioning according to the seasonal load. Therefore, annual electricity consumption can be improved.

In addition, the cost can be significantly lowered compared to the inverter capability control method, and the system can be simplified, thereby increasing the reliability.

According to the present invention, a variable volume rotary compressor, a method of operating the same, and a method of operating an air conditioner using the same include a plurality of discharge ports, and one of the discharge ports is opened and closed by a sliding valve according to a pressure difference so as to selectively connect to a suction port. By connecting to the pass hole, it is possible to adjust the air conditioner by varying the refrigeration capacity reduction rate during the variable volume operation of the compressor, and to reduce unnecessary power consumption of the compressor and the air conditioner employing the same.

In addition, by using the low-cost and reliable pilot valve, the back pressure of the sliding valve can be changed quickly and accurately, which can be widely applied to compressors or air conditioners having frequent refrigeration capacity control functions, as well as compressors or air conditioners employing the same. The whole efficiency fall can be prevented beforehand.

Claims (29)

A casing having a gas suction pipe communicating with the evaporator and a gas discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder which forms vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber and is fixedly installed in the casing; The upper and lower sides of the cylinder are covered to form an inner space together, and the discharge ports for discharging the compressed refrigerant by communicating with the inner space of the cylinder are formed on the same axis line, and are connected to one discharge port to communicate with the suction port of the cylinder. A plurality of bearing plates forming a pass hole; A plurality of discharge valves provided on the front end surface of each discharge port to open and close the discharge ports of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; And a back pressure switching unit for differentially supplying back pressure to the volume variable unit so that the volume variable unit opens and closes the bypass hole according to the operation mode of the compressor. A casing having a gas suction pipe communicating with the evaporator and a gas discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder which forms vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber and is fixedly installed in the casing; The upper and lower sides of the cylinder are covered together to form an inner space, and the discharge ports for discharging the compressed refrigerant by communicating with the inner space of the cylinder are formed on different axes, and are connected to one discharge port to communicate with the suction port of the cylinder. A plurality of bearing plates forming a pass hole; A plurality of discharge valves provided on the front end surface of each discharge port to open and close the discharge ports of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; And a back pressure switching unit for differentially supplying back pressure to the volume variable unit so that the volume variable unit opens and closes the bypass hole according to the operation mode of the compressor. A casing having a gas suction pipe communicating with the evaporator and a gas discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder for forming vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber, and a discharge port formed on the main surface to bypass a portion of the refrigerant gas, the cylinder being fixedly installed in the casing; The upper and lower sides of the cylinder are covered together to form an inner space, and one bearing plate is formed such that another discharge hole communicating with the inner space of the cylinder and discharging compressed gas into the casing is perpendicular to the discharge hole of the cylinder. The other bearing plate includes: a plurality of bearing plates forming a bypass hole so that the discharge port of the cylinder communicates with the suction port; A plurality of discharge valves provided on the front end surface of the discharge port to open and close the discharge port of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; And a back pressure switching unit for differentially supplying back pressure to the volume variable unit so that the volume variable unit opens and closes the bypass hole according to the operation mode of the compressor. A casing having a gas suction pipe communicating with the evaporator and a gas discharge pipe communicating with the condenser; As the rolling piston rotates, the inner space is formed at the center to compress the refrigerant, and the inner space is formed at the inner space to radially penetrate the gas suction pipe so as to communicate with the rolling piston. A cylinder for forming vanes slit in a radial direction to support the vanes partitioned into the compression chamber and the suction chamber, and a discharge port formed on the main surface to bypass a portion of the refrigerant gas, the cylinder being fixedly installed in the casing; The upper and lower sides of the cylinder are covered together to form an inner space, and one bearing plate is formed so that another discharge hole communicating with the inner space of the cylinder and discharging the compressed gas into the casing is inconsistent with the discharge hole of the cylinder. The other bearing plate includes: a plurality of bearing plates forming a bypass hole so that the discharge port of the cylinder communicates with the suction port; A plurality of discharge valves provided on the front end surface of the discharge port to open and close the discharge port of each bearing plate; A variable volume unit coupled to the bearing plate to selectively open and close the bypass hole of the bearing plate to exclude a portion of the compressed refrigerant to the inlet; And a back pressure switching unit for differentially supplying back pressure to the volume variable unit so that the volume variable unit opens and closes the bypass hole according to the operation mode of the compressor. The method according to claim 1 or 3, A variable displacement rotary compressor, characterized in that the plurality of discharge ports are all formed at the maximum compression angle. The method according to claim 2 or 4, The discharge port communicating with the inside of the casing is formed at the maximum compression angle, while the discharge port communicating with the bypass hole is formed such that its center is located in the range of 170 to 200 ° in the rotational direction of the rolling piston from the vane. Rotary compressor. The method according to any one of claims 1 to 6, A variable displacement rotary compressor, characterized in that the plurality of discharge port is formed to the same diameter. The method according to any one of claims 1 to 6, A variable displacement rotary compressor, characterized in that the diameter of the discharge port communicating with the bypass hole is formed relatively wider than the other discharge ports among the plurality of discharge ports. The method according to any one of claims 1 to 6, A variable displacement rotary compressor, characterized in that the plurality of discharge valve is formed to have the same elastic modulus. The method according to any one of claims 1 to 6, A variable displacement rotary compressor, characterized in that the valve elastic modulus on the discharge port side communicating with the bypass hole is made relatively small among the plurality of discharge valves. The method according to any one of claims 1 to 4, The bearing plate has a valve hole formed so as to be orthogonal to the bypass hole therein, and the volume variable unit is provided in the valve hole. The method of claim 11, The volume variable unit slides in the valve hole to slide the valve opening and closing the bypass hole while moving in the valve hole according to the pressure difference by the back pressure switching unit, and the pressure in both ends by elastically supporting the moving direction of the sliding valve. A variable displacement rotary compressor comprising at least one valve spring for moving the sliding valve to a closed position when the difference is the same, and a valve stopper for shielding the valve hole to prevent the sliding valve from being separated. The method of claim 12, Sliding valves are formed on both sides of the bypass hole to be in sliding contact with the inner circumferential surface of the valve hole, and a plurality of pressure parts are formed so that at least one can open and close the bypass hole while moving under pressure through the back pressure switching unit; And a communication part connecting a plurality of pressure parts and having a gas passage formed between the outer circumferential surface and the valve hole. The method of claim 13, The valve spring is variable displacement rotary compressor, characterized in that the one pressure portion is installed so as to close the bypass hole when the pressure at both ends of the sliding valve is the same. The method of claim 12, The valve spring is variable capacity rotary compressor, characterized in that the communication portion is installed so as to overlap the bypass hole to open the bypass hole when the pressure of both ends of the sliding valve is the same. The method according to claim 14 and 15, The variable pressure type rotary compressor, characterized in that for forming the spring fixing groove to insert the elastic member in the pressure portion of the sliding valve. The method of claim 11, The valve hole is variable capacity apparatus of the rotary compressor, characterized in that the first and second back pressure through-holes which communicate with the outlet of the above-mentioned back pressure switching unit, respectively on both sides thereof. The method according to any one of claims 1 to 4, The back pressure switching unit communicates with the gas suction pipe and the gas discharge pipe, respectively, and connects the pressure suction valve assembly and the first outlet of the pressure switching valve assembly so as to cross the gas suction pipe and the gas discharge pipe to both sides of the volume change unit. A variable capacity rotary compressor comprising: a first connecting pipe connected to one side of the second connecting pipe, and a second connecting pipe connecting the second outlet of the pressure switching valve assembly to the other side of the variable volume unit. The method of claim 17, The switching valve assembly has a switching valve housing which forms a low pressure side inlet connecting the gas suction pipe, a high pressure side inlet connecting the gas discharge pipe, and a second outlet connecting the first connection pipe and the second connection pipe connecting the first connection pipe. and, A switching valve which is slidably coupled to the inside of the switching valve housing and selectively connects the low pressure side inlet and the first outlet and the high pressure side inlet and the second outlet or the low pressure side inlet and the second outlet and the high pressure side inlet and the first outlet. Wow, An electromagnet installed at one side of the switching valve housing and moving the switching valve by an applied power source; A variable capacity device of a rotary compressor, characterized in that the elastic member for restoring the switching valve when the power applied to the electromagnet is cut off. A power operation mode in which the volume variable unit operates in a state in which the bypass hole is blocked at the start of the compressor, thereby producing maximum capacity; When the power operation mode is in progress, the control unit calculates the proper freezing capacity of the compressor, and when the freezing capacity needs to be lowered, the back pressure switching unit is operated so that the volume-variable unit opens the bypass hole so that the entire compressed refrigerant of the cylinder is removed from the inlet port. Shaving operation mode to ensure that; A method of operating the variable displacement rotary compressor of claim 1 or 3, characterized in that the crossover is performed. The method of claim 20, The saving operation mode is a method of operating a variable displacement rotary compressor, characterized in that it detects whether there is a pressure difference between the high pressure side and the low pressure side. The method of claim 21, The pressure difference between the high pressure side and the low pressure side detects the temperature of the condenser and the evaporator and judges that there is a valid high and low pressure difference if it is within the specified temperature range, and extends the saving operation. Operation method of a variable displacement rotary compressor, characterized in that for switching to. A middle operating mode in which a bypass hole is opened by the volume variable unit at the start of the compressor so that a part of the compressed refrigerant of the cylinder is excluded as the inlet; A power operation mode in which the back pressure switching unit is operated after the middle operation mode has been performed for a predetermined time to operate in a state in which the volume variable unit blocks the bypass hole to achieve maximum capability; While the power operation mode is in progress, the control unit calculates the proper freezing capacity of the compressor, and when the freezing capacity needs to be lowered, the back pressure switching unit is operated in reverse, so that the volume variable unit opens the bypass hole so that a part of the compressed refrigerant of the cylinder goes to the intake port. The middle driving mode to be excluded; A method of operating the variable displacement rotary compressor of claim 2 or 4, characterized in that the crossover is performed. The method of claim 23, The middle operation mode is a method of operating a variable displacement rotary compressor, characterized in that it detects whether there is a pressure difference between the high pressure side and the low pressure side to continue. The method of claim 24, The pressure difference between the high pressure side and the low pressure side detects the temperature of the condenser and the evaporator and judges that there is a valid high and low pressure difference in the prescribed temperature range, and extends the middle operation mode and operates the back pressure switching unit immediately after the temperature range is exceeded. A method of operating a variable displacement rotary compressor, characterized by switching to the mode. The method of claim 23, In the middle operation mode, the control unit calculates the proper freezing capacity of the compressor, and when it is necessary to lower the freezing capacity (zero), the power supply is turned off (OFF) further comprises a stop mode for stopping the compressor. Operation method of variable displacement rotary compressor. When the room temperature is higher than the set temperature (A) with the power applied, if the room temperature is higher than the set temperature (A), the compressor's volume variable unit operates with the bypass hole in communication with the inner space of the cylinder. And the maximum cold power mode to give the maximum capacity; During the maximum cold power mode, the indoor temperature and the set temperature (A) are compared, and if the room temperature is higher than the set temperature (A), the maximum cold power mode is continuously performed while the lower temperature is lower than the set temperature (A). A minimum cooling mode in which the bypass hole is opened so that the entire compressed refrigerant in the cylinder internal space is excluded as the suction port; Comparing the indoor temperature and the set temperature (B) while the minimum cold power mode is in progress, and if the room temperature is lower than the set temperature (B), turn off the power (OFF) to stop the compressor; A method of operating an air conditioner comprising the variable displacement rotary compressor of claim 1 and claim 3. When the room temperature is higher than the set temperature (A) with the power on, the volume variable unit of the compressor opens the bypass hole communicating with the inner space of the cylinder to An intermediate cold force mode for excluding a part of the compressed refrigerant into the suction port; While operating in the medium cold power mode, when the room temperature is higher than the set temperature (A) by comparing the room temperature with the set temperature (A), the volume variable unit blocks the bypass hole communicating with the inner space of the cylinder. The maximum cold power mode for driving at maximum capacity; An intermediate cold mode in which the indoor temperature is lower than the set temperature A while the maximum cold power mode is performed, and when the indoor temperature is lower than the set temperature A, the bypass hole is opened to operate while excluding a part of the compressed gas; Comparing the room temperature and the set temperature (B) while the intermediate cold mode is in progress, and when the room temperature is lower than the set temperature (B), the power is turned off (OFF) to stop the compressor; A method of operating an air conditioner comprising the variable displacement rotary compressor of claim 1 and 3 or 2 and 4. The method of claim 27 or 28, A method of operating an air conditioner having a variable displacement rotary compressor, characterized in that the first step of determining the total refrigeration capacity of the compressor required to switch modes and the corresponding operation time between the modes according to the total refrigeration capacity.

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