JPS58155291A - Rotary compressor - Google Patents

Abstract

PURPOSE:To enable a rotary compressor provided with a solenoid holding a vane to be activated by an activator for non-compressive activation by providing a micro-computer for inhibiting energization of a coil releasing an holding operation of a vane to stop the compressor always with the vane being held in the stoppage of the compressor. CONSTITUTION:When a power switch 45 is turned on to activate a rotary compressor 27A, a counter 32 counts a certain time, after an operation commanding signal is generated, to send a signal 44 for inhibiting energization of a coil 37 to a power supply switching circuit 22 until the counting of a certain film is completed. Thus, while the inhibiting signal 44 is sent, a vane is under the held condition and then the rotary compressor is rotated under the noncompressive condition. Hence, the rotary compressor 27A is stopped with a vane being held even if interruption of service takes place or a plug socket is withdrawn for a certain time.

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 aimed at cost reduction.

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 to control the capacity of a rotary compressor according to the load to save power.

Conventionally, a method of controlling vanes has been known as a capacity control method for 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
The inside of the cylinder 1 is partitioned into a high pressure side 23 and a low pressure side 24,
It is a vane that slides in the vertical direction while contacting the roller 3, and a groove 26 is provided in the side surface of the plate 72. 5 applies force to the upper end of the vane 72 and
A vane spring 8 presses the cylinder 1 against the roller 3.
7 is a discharge valve provided at the discharge port 6 of the cylinder 1; 9 is a discharge valve provided at the discharge port 6 of the cylinder 1; 9 is a coil 11 of which is energized to move the movable iron core 13, thereby holding the bay 72; A solenoid (details will be described later) 25 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. A capacity control rate calculation circuit 21 calculates a capacity control rate based on signals obtained from the indoor temperature detector 19 and the outdoor temperature detector 20, and a DC voltage obtained by the rectifier circuit 17 is pulsed in accordance with the capacity control rate. Then, the switching circuit 22 which applies the voltage to the coil 11 of the solenoid 9
It is composed of.

To explain the details of the solenoid 9 described above, the IO
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 a pin 15 attached to its tip, 1
4 is a spring inserted between the frame IO 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 by a vane spring 5 so as to come into contact with the roller 3, and the inside of the cylinder 1 is partitioned into a high pressure side 23 and a low pressure side 24. When the crank 4 rotates in the direction of the arrow, the bay 72 can reciprocate, that is, slide in the vertical direction, 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 vane 2 is held as shown in FIG. 1(b).

The method for holding the base 72 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 vane 2. Pin 15 is in groove 26
Once inside, the vane 2 will not return downward even when pushed by the vane/spring 5, 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 the 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/(τ1+τ2), where τI: uncompressed period τ2: compressed period, as shown in FIG. A nohalus-like voltage is applied to the coil 11 of the solenoid 9.

By the way, pin 15. Vane 2. The position fR relationship of the groove 26 is as follows.

That is, even when the vane 72 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 at a position ε1 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 62 points below the lower end of the tip of the pin 15.

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 72. . 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 friction coefficient μ of the contact surface between the groove 26 of the vane 2 and the pin 15
When the product is larger than μF2, that is, when F+>μF2, the pin 15 immediately moves to the right by the force of the spring 14, the vane 2 is released from its holding state, is pushed by the vane spring 5, and the roller 3, compression operation becomes possible. In the case of F+, <μF2, when the state shown in FIG. Compressing operation becomes possible when they come into contact with each other.

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 a vane 72 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
It varies depending on the model, but it is about 40 to 50 inches.

In order to start the compressor motor from a non-compressing state, the first
As shown in Figure (b), it is necessary to stop the rotary compressor 27 while holding the bay 72.

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 the tip of the vane into the groove of the vane, and a movable iron core that can slide vertically and have a groove on its side surface. In a rotary compressor equipped with a solenoid having a fixed iron core that attracts suction and a power source that controls the movement of the movable iron core, the solenoid has a suction force that attracts the movable iron core to the fixed iron core when the pen is held. This is a rotary compressor equipped with a permanent magnet that creates a magnetic field that generates .

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

FIG. 4 is a cross-sectional view of a 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 3° 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.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 is activated by the permanent magnet 40 in order to generate a magnetic field that cancels the magnetic field (11) of the permanent magnet 40. The suction force disappears, and the only force acting on the movable iron core 38 is the rightward spring force 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 bee 72 becomes capable of reciprocating movement. On the other hand, energization to the coil 37 is OIi
” When the temperature reaches F, the magnetic field from the coil 37 disappears, and the magnetic field from the permanent magnet 40 acts to attract the movable iron core 3.
8 moves 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 power to the compressor motor stops due to a power outage, etc., the inertial force immediately does not stop 3~
Rotate 4 times and then stop.

Therefore, if the coil 37 is energized to OIi''F when the compressor motor is de-energized, the coil 37 will be turned off during several rotations until the compressor motor stops rotating. The rotary compressor stops while holding the rotor (12).Therefore, when the rotary compressor stops due to a power outage, it stops while holding the base 72.

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

In other words, in order for the rotary compressor that we developed earlier to stop while holding the vane 2 when it stops, the compressor motor does not stop immediately even if the power to the compressor motor stops. The premise was that it would rotate three to four times due to inertia and then stop. ' Therefore, if the coil 37 is energized immediately after the rotary compressor is started and the compressor enters the compression state, there is a possibility that a power outage or the outlet may be unplugged before the rotary compressor reaches full rotation speed. Inertial force cannot be obtained,
There are cases in which the above three to four rotations due to inertial force cannot be expected. In such a case, the vane 2 cannot be stopped while being held.

(13) If the compressor stops in such a state, it becomes impossible to start the Rochley compressor with a simplified non-compression starting device that has only a running capacitor.

Therefore, since a starting device including a starting capacitor and a capacitor switching relay is required, the rotary compressor becomes expensive, which is a problem that should be further improved.

The purpose of the present invention is to provide an inexpensive rotary compressor which, by improving the above-mentioned problems, always stops with the vanes held when stopped and can be started with a starting device for non-compression starting. That is.

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 connects the inside of the cylinder to a high pressure side and a low pressure side. A movable vane that can be moved back and forth while in contact with the roller and that can hold the vane by fitting a pin provided at the tip of the vane into the groove of the vane (14). In a rotary compressor, the rotary compressor includes a solenoid having an iron core and a fixed iron core that attracts the movable iron core, and a power source that controls the movement of the movable iron core. A permanent magnet that forms a magnetic field that generates an attractive force that attracts the fixed iron core, and a magnetic field that cancels the magnetic field generated by the permanent magnet when energized is released, thereby releasing the holding operation of the vane. On the other hand, an operation command part that generates an operation command to the compressor motor, and a control unit that measures a certain period of time after issuing the operation command, and at 1, when the certain period of time has elapsed, transmits a signal from the power source to the coil. The rotary compressor is provided with a microcomputer having a counter that issues a signal to the power source to prohibit energization.

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

FIG. 5 is a circuit diagram illustrating a capacity control method using vane control for a rotary compressor according to an embodiment of the present invention.

In FIG. 5, the same parts are given the same numbers as in FIG. 4, 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 bay 72 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 to release the holding operation of the vane 2, and on the other hand, an operation in which a driving command is issued to the compressor motor 42. A microcomputer having a command unit 31 and a counter 32 that measures a certain period of time after issuing the operation command and issues a signal 44 to the power source 16 that prohibits energization from the power source 16 to the coil 37 until the certain period of time has elapsed. 43 is a rotary compressor 27A.

A more detailed explanation is as follows.

27A is a rotor type compressor, in which a compressor motor 42. A solenoid 30 with a coil 37 is shown. The compressor motor 42 has a main coil 28 and an auxiliary coil 29 (16), and the power to the compressor motor 42 is turned on and off by a power switch 45. The power switch 45 is turned on and off by a signal from the operation command section 31 of the microcomputer 43.

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. Indoor temperature setting device 18. Indoor temperature detector 19
．． A capacity control rate calculation circuit 21 that calculates a capacity control rate based on the signal obtained from the outdoor temperature detector 20. It is comprised of a switching circuit 22 for applying the DC voltage obtained by the rectifier circuit 17 to the coil 37 in a pulse form according to the capacity control rate.

In addition to the above-mentioned operation command section 31, the microcomputer 43 clocks a certain period of time from the operation command and generates a signal 44 that prohibits energization from the power source 16 to the coil 37 until the certain period of time has elapsed.
It also has a counter 32 that outputs to the power supply 16.

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

When attempting to start operation manually (for example, when the rotary compressor of this embodiment is incorporated into an air conditioner, when the operation switch is turned ON), the operation is automatically started (for example, when the operation switch is turned ON). When the timer of the harmonizer is activated and the operation is to be started automatically, a signal is output from the operation command section 31 of the microcomputer 43 and the power switch 45 is turned on.
By doing so, the rotary compressor 27A is started.

At the same time, the counter 32 measures a certain period of time after the driving command signal is issued. A signal 44 is sent to the switching circuit 22 of the power source 16 to prohibit energization of the coil 37 until the predetermined period of time is counted. Therefore, while the prohibition signal 44 is being output, the vane 2 is held, and during that time the rotary compressor 27A is rotating in a non-compressing state.

Therefore, even if there is a power outage or the outlet is unplugged within the above-mentioned certain period of time, the rotary compressor 27A will stop while holding the vane 2.

” - For a certain period of time, the rotary compressor 27A is started (1
8) Sufficient time to reach full speed rotation (e.g.
2 to 3 seconds).

When the prohibition of energization is lifted after a certain period of time has elapsed, the switching circuit 22 energizes the coil 37 in accordance with the command from the capacity control calculation circuit 21 and performs capacity control, as in the conventional case. In this case, since the rotary compressor 27A has reached full rotation speed, it has accumulated sufficient inertia and will continue to rotate 3 to 4 times even if a power outage occurs, so it will hold the bay 72 and stop. can.

In this way, the rotary compressor 2 is always kept in an uncompressed state.
Since 7A can be stopped, uncompressed startup can be performed.
As the starting torque is reduced, restarting becomes possible even if the starting device is simplified.

Most of the recent air conditioners incorporating rotary compressors are equipped with microcomputers, so even if commands from Microcomputer 43 are adopted as in this example, the above control can be performed without cost increase. be.

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 (19) rate calculation circuit may also be processed within the microcomputer.

Furthermore, in this embodiment, the microcomputer 4
3, but it goes without saying that an electric circuit other than the microcomputer may be used.

According to the embodiment described above, the rotary compressor 27A
By prohibiting the rotary compressor 27A from shifting to the compressed state for a certain period of time after being started, the vane 2 is always held and the rotary compressor 27A is stopped in the non-compressed state when the rotary compressor 27A is stopped. As a result, the starting device can be simplified and an inexpensive air conditioner (air conditioner incorporating a rotary compressor) can be provided.

As described in detail above, according to the present invention, at least a cylinder, a roller that rotates in the cylinder, a crank that rotates the roller, a compressor motor that drives the crank, and the The inside of the cylinder is divided into a high pressure side and a low pressure side, and the cylinder is operated back and forth while in contact with the roller,
A vane with a groove on its side surface, a movable iron core that can hold the vane by fitting a pin provided at its tip (20) into the groove of the vane, and a fixed iron that attracts the movable iron core. In a rotary compressor equipped with a solenoid having a core and a power source that controls the movement of the movable iron core, a magnetic field is provided in the solenoid that generates an attractive force that attracts the movable iron core to the fixed iron core when the vane is held. a permanent magnet forming a
A driving command unit is provided with a coil capable of releasing a holding operation of the vane by generating a magnetic field that cancels the magnetic field generated by the permanent magnet when energized, and a driving command unit that issues a driving command to the compressor motor. A microcomputer is provided that has a counter that measures a certain period of time after issuing the operation command and issues a signal to the power source that prohibits energization from the power source to the coil until the certain period of time has elapsed. It is possible to provide an inexpensive rotary compressor that always stops with the vanes held when stopped and can be started using a non-compression starting device.

[Brief explanation of drawings]

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 , Fig. 1 is a cross-sectional view of the main parts showing the movement of the movable iron core as the solenoid is energized, and the positional relationship of the pin, vane, and groove of the vane. FIG. 5 is a sectional view of a main part of an example of a rotary compressor, and is a circuit diagram for explaining a capacity control method using vane control of a rotary compressor according to an embodiment of the present invention. 1...Cylinder, 2...Vane, 3...Roller,
4... Crank, 16... Power supply, 23... High pressure side, 24... Low pressure side, 26... Groove, 27A... Rotary compressor, 3°... Solenoid, 31... ...Operation command section, 32...Counter, 33...Pin, 37.
... Coil, 38 ... Movable iron core, 39 ... Fixed iron core, 40 ... Permanent magnet, 42 ... Compressor motor, 43
...Microcomputer, 44...Signal. Agent Patent attorney Kosaku Fukuda (and 1 other person) Kaya 4 (Ln)

Claims (1)

[Claims] 1. 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 roller that partitions the inside of the cylinder into a high pressure side and a low pressure side. A vane that reciprocates while in contact with each other 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 this movable iron core. In a rotary compressor comprising a solenoid having a fixed iron core for suction and a power source for controlling the movement of the movable iron core, the movable iron core is attracted to the fixed iron core in the solenoid when the hone is held. 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. an operation command unit that issues an operation command to the compressor motor; and a signal that measures a certain period of time after issuing the operation command, and prohibits energization from the power source to the coil at 1 when the certain period of time has elapsed. A rotary compressor, characterized in that it is provided with a microcomputer having a counter that outputs the power to the power source.