JPS58202390A - Rotary compressor - Google Patents

Abstract

PURPOSE:To permit suspension of operation of a vane in the held state and permit start from the non-compressed state by intercepting the conduction of a coil of a power source for controlling the movement of a movable iron core, when the supply voltage is lower than a standard voltage. CONSTITUTION:When an electric outlet is pulled-out during the operation of a rotary compressor 27A, the supply voltage of a compressor motor 42 is detected by a voltmeter 31, and the voltage monitoring part 32 of a microcomputer 43 judges whether the supply voltage is lower or not than a standard voltage set beforehand, and if the detected voltage is lower than the set standard voltage, a signal 44 for cutting-off the current to a coil 37 for holding the vane 2 through which said holding operation can be released from a power source 16 is transmitted to the power source which controls the movement of a movable iron core 38 for holding the vane 2 by inserting a pin 33. As a result of this, the movable iron core 38 immediately acts to hold the vane 2 and continues the above operation during the time in which a compressor motor 42 is in revolution, and the compressor 27A is stopped in the state of holding the vane 2. Start from the non-compressed state is permitted, and the starting torque can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary compressor, and more particularly to a rotary compressor that implements a capacity control method using vane control and is intended to reduce starting torque.

Rotary compressors are widely used as refrigerant compressors in refrigeration cycles, such as air conditioners.
Recently, there has been a strong demand for reducing the power consumption of air conditioners throughout the year.

In order to meet this demand, a method has been implemented in which the capacity of a rotary pressure machine is controlled according to the load to save power.

Conventionally, a method of controlling vanes has been known as one method for increasing the capacity of a rotary compressor.

Figure 1 is for explaining a capacity control method using vane control for a conventional rotary compressor.
FIG. 1A is a sectional view of a main part showing a state in which the holding operation of the vane is released, and FIG. 1(b) is a sectional view of a main part showing a state in which the vane is held.

In FIG. 1, 1 is a cylinder of a rotary compressor 27, 3 is a roller that rotates inside the cylinder 1, and 4 is a crank that rotates the roller 3 (this crank 4 is a compressor motor (not shown). ), 2 is driven by
It is a vane that partitions the inside of the cylinder 1 into a high pressure side 11t123 and a low pressure side 24, and slides vertically while contacting the roller 3. A groove 26 is provided on the side surface of the vane 2. 5 is a vane spring that applies force to the upper end of the vane 2 and presses the vane 2 against the roller 3; 8 is a suction port provided in the cylinder 1; and 7 is a discharge port provided in the discharge port 6 of the cylinder 1. The valve 9 is a solenoid (details will be described later) that can hold the vane 2 by energizing its coil 11 and moving the movable iron core 13;
This is a chamber that houses a rotary compressor 27.

Reference numeral 16 denotes a power source that energizes the coil 11 of the solenoid 9 to control the movement of the movable iron core 13. This power source 16 is connected to a rectifier circuit 17 that energizes the coil 11 with direct current, and an indoor temperature setting device 18. It is comprised of a switching circuit 22 for applying signals obtained from an indoor temperature detector 19 and an outdoor temperature detector 20 to the coil 11 of the solenoid 9 in a pulse form according to the capacity control rate.

To explain the details of the solenoid 9 described above, 10
is the frame of the solenoid 9, 11 is housed in the frame 10, and both ends thereof are connected to the switching circuit 2 of the power supply 16.
Coil connected to 2, 12 is a fixed iron core, 13 is,
A movable iron core with pins 15 scattered at its tip, 1
4 is a spring inserted between the frame 10 and a spring seat 13a provided on the movable iron core 13.

In the conventional rotary compressor configured as described above, during compression operation, as shown in FIG. 1(a),
The vane 2 is pushed into contact with the roller 3 by a vane spring 5, and partitions the inside of the cylinder 1 into a high pressure side 23 and a low pressure side 24. When the crank 4 rotates in the direction of the arrow, the vane 2 is able to reciprocate, that is, slide vertically, the volume of the low pressure side 24 increases, and gas is sucked from the suction port 8. On the other hand, the high pressure side 23
Since the volume decreases as the crank 4 rotates,
The gas therein is compressed and when the pressure exceeds the pressure inside the chamber 25, it passes through the discharge port 6 and pushes the discharge valve 7 up into the chamber 2.
It flows out within 5.

During capacity control operation, the base 7
Hold 2.

The method of holding the vane 2 is that when the coil 11 of the solenoid 9 is energized (the energization method related to the capacity control method will be described later), the movable iron core 13 is attracted to the fixed iron core 12,
It moves leftward from the state shown in FIG. 1(a) to the state shown in FIG. 1(b), and the pin 15 attached to the tip of the movable iron core 13 enters the groove 26 of the base 72. Pin 15 is in groove 26
Once inside, even if the vane 2 is pushed by the vane spring 5, it will not return downward, and since the inside of the cylinder 1 is not partitioned by the vane 2, the volume inside the cylinder 1 will not change even if the roller 3 rotates. There will be no compression effect.

The capacity control method will be explained using FIGS. 2 and 3.

Fig. 2 is a time chart showing the control pattern of the solenoid in Fig. 1, and Fig. 3 shows the movement of the movable iron core as the solenoid is energized in Fig. 1, and the positions of the pin, vane, and groove of the vane. FIG. 3 is a cross-sectional view of main parts showing the relationship.

First, indoor temperature setting device 18. A capacity control rate calculation circuit 21 calculates a total capacity control rate from signals obtained from the indoor temperature detector 19 and the outdoor temperature detector 20. When the capacity control rate obtained in this way is α, the switching circuit 2
2, the DC voltage obtained from the rectifier circuit 17 is switched to a pulsed voltage having the relationship α=τ1/(τl+2), where τl: uncompressed period τ2: compressed period, as shown in FIG. , this pulsed voltage is applied to the coil 11 of the solenoid 9.

By the way, pin 154 base 722. The positional relationship of the grooves 26 is as follows.

That is, even when the vane 2 is at the lowest position, the pin 15 is in a position where it can come into contact with the vane 2, as shown in FIG. At this time, the upper end of the groove 26 is located above the upper end of the tip of the pin 15, as shown in FIG. 3(C). At this time, the lower end of the groove 26 is located below the lower end of the tip of the pin 15 by ε2.

Here, when a voltage is applied to the coil 11 of the solenoid 9 at an arbitrary time, the movable iron core 13 of the solenoid 9 moves to the left as shown in FIG.
5 comes into contact with the vane 2. When the roller 3 rotates further and reaches the top dead center (point P in FIG. 3(a)), the vane 2 is lifted by the roller 3, and the tip of the pin 15 fits into the groove 26 of the vane 2. Furthermore, roller 3 rotates,
When the vane 2 reaches the position shown in FIG. 3(d), since the vane 2 is held by the pin 15, the inside of the cylinder 1 is not partitioned by the vane 72 and no compression action is performed.

Meanwhile, the voltage to the coil 11 of the solenoid 9 is cut off, and the second
When entering the compression period τ2 in the figure, the force Fl of the spring 14 of the solenoid 9 becomes the sum F2 of the back pressure of the vane 2 and the force of the vane spring 5.
and the coefficient of friction μ between the groove 26 of vane 2 and the contact surface of pin/15.
If the product is larger than μF2, that is, Fl > μF2
In this case, the pin 15 immediately moves to the right due to the force of the spring 14, the vane 2 is released from its holding state, and the vane spring
The compressor is pressed by the roller 3 and comes into contact with the roller 3, thereby enabling compression operation. In the case of Fl<μF2, the pin 15 moves to the right when the state shown in FIG. compression operation becomes possible.

As described above, compression is achieved by applying the pulsed voltage shown in FIG. 2 to the solenoid 9.

The capacity of the rotary compressor can be controlled by repeating the non-compressing operation.

A rotary compressor that implements the capacity control method using vane control described above has two vanes, as shown in FIG. 1(b).
When a compressor motor (not shown) is started from a non-compressed state where the compressor is lifted, the starting torque is smaller than when started from a compressed state as shown in FIG. 1(a). The rate of this reduction is
Although it varies depending on the model, it is about 40-50%.

In order to start the compressor motor from a non-compressing state, the first
As shown in Figure Φ), it is necessary to stop the rotary compressor 27 while holding the vane 2.

The present inventors have previously developed a rotary compressor that can stop a rotary compressor using a capacity control method using vane control while holding the vanes, and then start from an uncompressed state when starting up. developed a machine (patent application 1982)
-202460).

The characteristics of the rotary compressor that the present inventors developed earlier include at least a cylinder, a roller that rotates within the cylinder, and a partition that partitions the inside of the cylinder into a high-pressure side and a low-pressure side that comes into contact with the roller. a movable iron core that can hold the vane by fitting a pin provided at its tip into the groove of the vane, and the movable iron core. In a rotary compression mode, which is equipped with a solenoid having a fixed iron core that attracts the movable iron core, and a power source that controls the movement of the movable iron core, the movable iron core is attracted to the fixed iron core when the vane is held in the solenoid. This rotary compressor is equipped with a permanent magnet that creates a magnetic field that generates an attractive force.

An example of this rotary compressor will be explained using FIG. 4.

FIG. 4 is a cross-sectional view of the main part showing an example of a rotary compressor that the present inventors developed earlier, and FIG. Figure, 4th
Figure (b) is a sectional view of a main part showing a state in which the vane is held.

In FIG. 4, the same parts as in FIG. 1 are denoted by the same numbers. The solenoid 30 has a movable iron core 38 with a pin 33 attached to its tip. A laminated iron core 41 with a hole 41a through which the movable iron core 38 passes. Permanent magnets 40 are placed above and below this laminated iron core 41. Magnetic metal frame 36. Coil 37. Fixed iron core 39. and a spring seat 34 provided on the cylinder 1 and the movable iron core 38.
A compressed spring 35 is inserted between the movable iron core 38 and the fixed iron core 39 and provides a repulsive force between the movable iron core 38 and the fixed iron core 39. The permanent magnet 40 includes a movable iron core 38, a laminated iron core 41.
Permanent magnet40. It creates a magnetic field that circulates between the frame 36 and the fixed iron core 39, and the movable iron core 38 is attracted to the fixed iron core 39 by the attractive force generated by this magnetic field.

The above-mentioned coil 37 can be turned into a permanent magnet 4 by being energized.
This is a degaussing coil that can generate a magnetic field that cancels out the magnetic field generated by zero.

In the rotary compressor configured as described above, when the coil 37 is energized when changing from the non-compression state to the compression state, the coil 37 generates a magnetic field that cancels the magnetic field of the permanent magnet 40, so that the attractive force by the permanent magnet 40 is reduced. gone,
The only force acting on the movable iron core 38 is the spring force to the right of the spring 35.

Therefore, the movable iron core 38 moves to the right, the pin 33 comes out of the groove 26 of the vane 2, and the vane 2 becomes able to reciprocate. On the other hand, the current to the coil 37 is turned off.
', the magnetic field from the coil 37 disappears, and the attractive force from the magnetic field from the permanent magnet 40 acts, causing the movable iron core 38 to move to the left unconditionally.

The roller 3 is connected to the crank 4. Since it is connected to the rotor of the compressor motor (not shown) through the crankshaft, it has a large inertial force, so even if the power to the compressor motor stops due to a power outage, the inertial force can be stored. Don't stop immediately-3
-7-4 rotations and then stop.

For this reason, when the power to the compressor motor is turned off, the power to the coil 37 is turned off.If you strain the coil 37, the vane 2 will be held for several rotations until the compressor motor stops rotating. The rotary compressor will stop. Therefore, when the rotary compressor stops due to a power outage, it stops with the vanes 2 held.

By the way, the rotary compressor previously developed by the present inventors as described above had the following problems that should be improved.

That is, when assuming a power outage or a corresponding case where the outlet is unplugged, the coil voltage of the coil 37 of the solenoid 30 may not immediately become zero.

FIG. 5 is a coil voltage drop characteristic diagram showing an example of the change in coil voltage of the solenoid coil when the outlet is unplugged.

As shown in FIG. 5, the coil voltage drops after a certain period of time (for example, it becomes 0 at 100 m1JlIli). This can be done by unplugging the outlet or coil 37.
It is also related to the characteristics of the power supply that supplies electricity.

On the other hand, after the outlet is unplugged, the compressor and motor rotate 3 to 4 times due to inertia, which is about 100 m5ec or less.

Therefore, when the coil voltage of the coil 37 drops as shown in FIG. 5, when the coil voltage becomes O, the attractive force of the permanent magnet 40 is restored, and the movable iron core 38 starts moving, the compressor motor has already started to move. Rotation may stop due to inertia, and in this case, the rotary compression @ 27 stops without holding the vane 2, which is a problem that should be further improved.

By improving the above-mentioned problems, the present invention makes it possible to always stop the vane in a state where the vane is held when the vehicle is stopped, and to start from an uncompressed state at the time of startup. The purpose is to provide a rotary compressor with low starting torque.

The features of the present invention include at least a cylinder, a roller that rotates within the cylinder, a crank that rotates the roller, a compressor motor that drives the crank, and a cylinder that has an interior that is divided into a high-pressure side and a low-pressure side. A vane that reciprocates while in contact with the partition roller and has a groove on its side surface, and a movable iron core that can hold the vane by fitting a pin provided at its tip into the groove of the vane. In a rotary compressor equipped with a solenoid having a fixed iron core that attracts the movable iron core, and a power source that controls the movement of the movable iron core, the movable iron core is fixed in the lunoid when the vane is held. A permanent magnet that forms a magnetic field that generates an attractive force that attracts the core, and a magnetic field that cancels the magnetic field generated by the permanent magnet by energization to release the holding operation of the vane. On the other hand, a voltage detector is provided to detect the power supply voltage of the compressor motor, and when the power supply voltage detected by the voltage detector is lower than a preset reference voltage, the movement of the movable iron core is controlled. The rotary compressor is provided with a microcomputer having a voltage monitoring section that issues a signal to the power supply to cut off the power supply to the coil.

The present invention will be explained below with reference to Examples.

FIG. 6 is a circuit diagram for explaining a capacity control method using vane control for a rotary compressor according to an embodiment of the present invention.

In FIG. 6, the same parts as in FIG. 4 are denoted by the same numbers, and the parts shown in FIG. 4 are the same in this embodiment.

To explain the outline of this embodiment, a permanent magnet 40 that forms a magnetic field in the solenoid 30 that generates an attractive force that attracts the movable iron core 38 to the fixed iron core 39 when the vane 2 is held;
A coil 37 is provided which, when energized, generates a magnetic field that cancels the magnetic field generated by the permanent magnet 40 and releases the holding operation of the vane 2. On the other hand, the power supply voltage of the compressor motor 42 is When the voltage detector 31 detects and the power supply voltage detected by the voltage detector 31 is lower than a preset reference voltage, the power supply 16 that controls the movement of the movable iron core 38 stops the coil 37 from being energized. This rotary compressor 27A is provided with a microcomputer 43 having a voltage monitoring section 32 that emits a signal 44 to shut off.

A more detailed explanation is as follows.

27A is a rotary compressor, in which a compressor motor 42 and a solenoid 30 having a coil 37 are attached. The compressor motor 42 has a main coil 2
8 and an auxiliary coil 29, this compressor motor 4
The power supply voltage No. 2 can be monitored by a voltage monitoring unit 32 of a microcomputer 43 using a voltage detector 31.

The configuration of the power source 16 that energizes the coil 37 of the solenoid 30 and controls the movement of the movable iron core 38 is the same as that of the prior art shown in FIG. Setting device 18. , indoor temperature detector 1
9. Capacity control rate calculation circuit 21° rectifier circuit 17 that calculates the capacity control rate based on the signal obtained from the outdoor temperature detector 20
The switching circuit 22 is configured to apply the obtained DC voltage to the coil 37 in the form of a pulse according to the volume control rate.

The operation of this embodiment configured as described above will be explained.

During operation of the rotary compressor 27A, when the outlet is unplugged, the power supply voltage of the compressor motor 42 decreases, and this power supply b1 voltage is detected by the voltage detector 31. Microcomputer 4
The voltage monitoring unit 32 of No. 3 is configured such that the power supply voltage is a preset reference voltage (for example, 70V when the power supply voltage is 100
v) Determine whether the voltage is lower than the reference voltage, and if it is below the reference voltage, send a signal 44 to the power source 16 that controls the movement of the movable iron core 38 to cut off the power supply from the power source 16 to the coil 37, and forcefully Power to the coil 37 is cut off.

FIG. 7 shows the change in coil voltage when the current to the coil 37 is forcibly cut off using this method.

FIG. 7 is a voltage drop characteristic diagram showing a change in the coil voltage of the solenoid coil when the rotary compressor according to FIG. 6 is unplugged.

As is clear from FIG. 7, the coil voltage becomes 0 immediately after the outlet is unplugged.

As a result, after the outlet is unplugged, the movable iron core 38 immediately turns to hold the vane 2, holds the vane 72 while the compressor motor 42 is rotating, and holds the rotary compressor 27.
A stops while holding the vane 2.

The above describes the operation when the outlet is unplugged, but the operation in the case of a power outage is also exactly the same.

In this embodiment, the microcomputer 43 and the capacity control rate calculation circuit 21 are provided separately, but it goes without saying that the function of the capacity control rate calculation circuit may also be processed within the microcomputer.

According to the embodiment described above, when the power goes out or the outlet is unplugged, the movable iron core 38 immediately moves to hold the vane 2, so when the rotary compressor 27A is stopped, the vane 72 is surely held and stopped. I can do it.

That is, the power supply voltage of the compressor motor 42 when cutting off the current to the coil 37 is 70V in this embodiment.
(=reference voltage), and the torque of the compressor motor 42 at this time is about 50% of that when the voltage is 1 oov. Therefore, immediately after the coil 37 is forcibly de-energized, not only the inertial force but also the above torque is acting on the compressor motor 42. Therefore, before holding the bay 72, the compressor motor 42
The rotation of the vane 2 does not stop, and the vane 2 can be reliably held and stopped.

As explained in detail above, according to the present invention, at least a cylinder, a roller rotating in the cylinder, a crank for rotating the roller, a compressor motor for driving the crank, and a cylinder for rotating the cylinder. The inside is divided into a high pressure side and a low pressure side, and the roller moves back and forth while coming into contact with the roller,
A vane with a groove on its side, a movable iron core that can hold the vane by fitting a bottle provided at its tip into the groove of the vane, and a fixed iron core that attracts the movable iron core. In a rotary compressor comprising a solenoid and a power source for controlling the movement of the movable iron core, a magnetic field is formed in the solenoid to generate an attractive force that attracts the movable iron core to the fixed iron core when the vane is held. and a coil capable of releasing the holding operation of the vane by generating a magnetic field that cancels the magnetic field generated by the permanent magnet when energized. a voltage detector that detects the voltage, and when the power supply voltage detected by the voltage detector is lower than a preset reference voltage, a power supply that controls the movement of the movable iron core;
Since a microcomputer is provided that has a voltage monitoring unit that issues a signal to cut off the current to the coil, the vane is always held in place when stopped, and when started it can be started from a non-compressed state, with low starting torque. A rotary compressor can be provided.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional rotary compressor to explain the capacity control method using vane control, Fig. 2 is a time chart showing the control pattern of the solenoid in Fig. 1, and Fig. 3 is a , the movement of the movable iron core due to energization of the solenoid in Figure 1, and the movement of the bottle, vane, and he-7
Figure 4 is a sectional view of the main part showing the positional relationship of the grooves, Figure 4 is a sectional view of the main part showing an example of the rotary compressor that the present inventors developed earlier, and Figure 5 is the main part sectional view showing the positional relationship of the grooves. , a coil voltage drop characteristic diagram showing an example of a change in coil voltage of a solenoid coil, and FIG. 6 is a circuit for explaining a capacity control method using vane control for a rotary compressor according to an embodiment of the present invention. 7 are voltage drop characteristic diagrams showing changes in the coil voltage of the solenoid coil when the rotary compressor according to FIG. 6 is unplugged. 1...Cylinder, 2...Vane, 3...Roller,
4... Crank, 16... Power supply, 23... High pressure side, 24... Low pressure side, 26... Groove, 27A... Rotary compressor, 30... Solenoid, 31...・Voltage detector, 32... Voltage monitoring section, 33... Bin, 37
...Coil, 38...Movable iron core, 39...Fixed iron core, 40...Permanent magnet, 42...Pressure (and 1 other name)
hi'knee, i, 1 ≠ 10 (su #2 Mekicho 3A 40 (a-) 3θ 4r eyes > 1)! & ga made power ＼umef fall Tk'l<* Mc nosu raguchi 1ic (oOV

Claims (1)

[Claims] 1. At least a cylinder, a roller that rotates in the cylinder, a crank that rotates the roller, a clamping machine motor that drives the crank, and a system that partitions the inside of the cylinder into a high pressure side and a low pressure side. A movable iron core that reciprocates while in contact with a roller and has a groove on its side surface, a movable iron core that can hold the vane by fitting a pin provided at its tip into the groove of the vane, and the movable iron core. In a rotary compressor equipped with a solenoid having a fixed iron core that attracts the iron core and a power source that controls the movement of the movable iron core, the movable iron core is attracted to the fixed iron core when the vane is held in the solenoid. a permanent magnet that forms a magnetic field that generates an attractive force; and a coil that can release the holding operation of the vane by generating a magnetic field that cancels the magnetic field generated by the permanent magnet when energized. On the other hand, a voltage detector detects the power supply voltage of the compressor motor, and when the power supply voltage detected by this voltage detector is lower than a preset reference voltage, the power supply for controlling the movement of the movable iron core is connected to the power supply. A rotary compressor comprising: a microcomputer having a voltage monitoring section that issues a signal to cut off energization to a coil.