JPH0524750B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is used in place of a rotating mechanism provided in a motor, pump, etc., and is partially distorted due to a piezoelectric phenomenon, and this distortion continuously moves to reduce the apparent This relates to a distorted rotating ring that rotates upward.

(Prior Art) Generally, due to its operating principle, a motor for driving a driven object has a rotor having a drive shaft at its center.
It is equipped with a field, an armature, etc. to rotate it. Further, when the fluid supply pump is used, its drive shaft is connected to and driven by the motor as described above.

(Problems to be solved by the invention) However, in the drive motor as described above,
Since it requires a field magnet, an armature, etc., it is unfortunately large and heavy. Furthermore, a fluid circuit equipped with a fluid supply pump has the drawback that it requires a separate pump drive motor, resulting in high costs. Moreover, the refrigerant discharge direction of the compressor installed in the refrigeration system is determined in advance, so when this is installed in an air-conditioner, a four-way switching valve is required in the refrigerant circulation circuit, making the circuit complicated. However, it also has the disadvantage of increasing the cost of the device. Moreover, the presence of sliding surfaces and moving parts reduces control response and energy saving, causes resonance, and requires lubrication.

(Purpose of the Invention) Therefore, in order to eliminate the above-mentioned drawbacks of motors and pumps, the present inventor investigated various simple configurations to replace the rotation mechanism of motors and pumps, and as a result, developed a bimorph, etc. The present invention was completed by focusing on piezoelectric elements. That is,
A piezoelectric element such as a bimorph is made by stacking two piezoelectric plates on top of each other, and when a voltage is applied, one piezoelectric plate expands and the other piezoelectric plate contracts, causing the whole to bend and distort. If a flexible piezoelectric element is formed into a ring shape, the piezoelectric element is bent into an elliptical shape, and the elliptical distortion is rotated, this distorted rotation ring can also be used for motors and pumps. It was discovered that the main part of the rotation mechanism can be configured, and thereby, the object of the present invention is to
By providing a distorted rotation ring as described above,
In addition to eliminating the need for a motor field or armature, the pump is compact and lightweight.The pump itself has a built-in drive source, eliminating the need for an additional drive motor when the pump is in use. The purpose of the present invention is to eliminate the need for a four-way switching valve in an air conditioner/heater by allowing reverse rotation.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention, as shown in FIGS. 1 and 3, is a piezoelectric element 2 such as a flexible bimorph. The rotary ring body 1 is formed by forming the rotary ring body 1 into a shape. The rotating ring main body 1 is provided with three or more opposing parts across the center O, and a set of electrodes _3A , _3A ', _3B , _3B ', inside and outside each pair of parts. 3 _C , 3 _C ′ are respectively arranged, and the respective electrodes 3 _A , 3 _A ′, 3 _B , 3 _B ′, 3 _C ,
Strain generating means 5A, 5B, and 5C are provided for distorting each portion outward by applying current to 3C _' . Furthermore, electrodes _3A ,
Strain rotation means 6 for distributing power in the order of positions in the circumferential direction of the rotating ring main body 1 of 3 _A ', 3 _B , 3 _B ', 3 _C , 3 _C '
The configuration is such that the following is provided.

(Function) With the above configuration, in the present invention, the strain rotation means is used to connect the electrodes _3A , 3 of each strain generation means _5A , _5B , _5C .
Power is sequentially distributed to _A ′, 3 _B , 3 _B ′, 3 _C , and 3 _C ′, and the parts facing each other across the center O of the rotating ring main body 1 are simultaneously bent outward, and accordingly, the corresponding parts are bent outward at the same time. Each part on a straight line perpendicular to the straight line passing through each part is distorted inward, and the rotating ring main body 1 is distorted and deformed into an elliptical shape, and this distortion and deformation is repeated while moving in the circumferential direction over time, causing rotation The ring body 1 will apparently rotate. As a result, this distorted rotation ring can be used as the main part of the rotation mechanism of a motor or pump, eliminating the need for a field or armature, making the motor smaller and lighter, and driving the pump itself. Built-in power source eliminates the need for a pump drive motor. Furthermore, when applied to the rotating mechanism of a compressor, the refrigerant discharge direction can be reversed by reversing the order of power distribution to each strain generating means, eliminating the need for a four-way switching valve when installed in an air conditioner. can. Furthermore, when applied to a motor rotation mechanism, since the amount of bending distortion of the rotary ring body is small, the accuracy of the rotation speed and rotation angle becomes high, and it can be used as a stepping motor.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows the main part configuration of a distorted rotation ring R according to the present invention. In the figure, reference numeral 1 denotes a rotating ring body formed in a ring shape, and as shown in enlarged detail in FIG. It consists of a piezoelectric element 2 such as a bimorph, in which two flexible polymer composite piezoelectric plates 2a, 2a without in-plane anisotropy, which are dispersed in Each piezoelectric plate 2a, 2a has its polarization direction facing in the opposite direction to the bonding surface as shown by the arrow in the figure, and the + side of the DC power supply Z is connected to the inner piezoelectric plate 2a, and the outer piezoelectric plate 2a is connected to the positive side of the DC power supply Z. When one side of the piezoelectric element 2 is connected to each other, the outer piezoelectric plate 2a expands and the inner piezoelectric plate 2a contracts, causing the entire bimorph piezoelectric element 2 shown in the figure to bend outward (downward in the figure). It has the property of

In FIG. 1, around the rotating ring body 1, there are six pairs of electrodes 3 _A , 3 _A ′, 3 _B , 3 _B , which face each other and sandwich the rotating ring body 1 from the inside and outside in the radial direction.
3 _B ', 3 _C , and 3 _C ' are arranged, and the electrode 3 _A and the electrode 3 _A ' are provided at opposing positions with the center O of the rotating ring main body 1 in between, and the electrode 3 _B and the electrode 3 _B ', the electrode _3C , and the electrode _3C ' are respectively provided at opposing positions with the center O of the rotating ring main body 1 in between, similarly to the above. Therefore, each of the above electrodes 3
As shown in FIG. 3, _A to 3 _C ' are connected to one side of the DC power supply 4 through the negative terminals (A-) to (C-), and the inner power supplies are connected to the positive terminal (A+). )~
(C+) to the + side of the DC power source 4 (the wiring of electrodes 3 _B - 3 _B ′, 3 _C - 3 _C ′ is omitted), and the opposing electrodes 3 _A - 3 _A ′,
By applying the voltage of the DC power supply 4 to 3 _B - 3 _B ′ and 3 _C - 3 _C ′ and energizing them, a pair of energized electrodes 3 _A - 3 _A ′ and 3 _B of the rotating ring body 1 are energized. -3
Three strain generating means each strain outwardly the portion where _B ' or 3 _C -3 _C ' (electrodes 3 _A -3 _A ' in Fig. 3) are located, as shown by imaginary lines in the figure. 5 _A ,
It consists of 5 _B and 5 _C.

Further, a control circuit 6 is interposed between each of the electrodes _3A to _3C ' and the DC power supply 4 as a distortion rotation means for controlling the order of power distribution to each of the electrodes _3A to _3C '. . As shown in FIG. 4, the control circuit 6 connects one terminal ( _A- ), (A- _' ) and a + terminal (A+), ( A+'
)
a pair of first contacts 7 _A interposed in the power supply line to the
Another set of opposing electrodes 3 _B -3 from the DC power source 4
- terminal ( _B- ), (B-') and + terminal (B
+), (B+'), a pair of second contacts 7 _B interposed in the feeder line to (B+'), and the - terminal of the remaining pair of opposing electrodes 3 _C -3 _C ' from the DC power source 4 C-), (C
-') and + terminals (C+) and a pair of third contacts _7C interposed in the feeder line to (C+'), and the opening/closing timing of each contact _7A to _7C is the fifth As shown in the figure, they are set in the order of first → second → third, and the opening and closing operations of the respective contacts 7 _A to 7 _C distribute power to the three strain generating means 5 _A to 5 _C from the electrodes 3 _A → 3 _B → 3 _C (or electrodes 3 _A ' → 3 _B ' → 3 _C '), that is, in the order of the positions of the electrodes in the circumferential direction of the rotating ring body 1.

Therefore, in the above embodiment, the control circuit 6 controls the order of power distribution to the three strain generating means _5A to _5C , and the order of power supply to a pair of opposing electrodes is _3A to _3A . ′→3 _B −3 _B ′→3 _C −3 _{C ′} Therefore, as shown _by the imaginary line in FIG. This causes a bending strain in the direction, and due to this distortion, the parts P and P' on the straight line _l2 perpendicular to the straight line _l1 passing through each part contract inward, and the rotating ring body 1 extends the straight line _l1 . After being distorted into an elliptical shape having an axis, this elliptical shape sequentially rotates as shown in FIG.

Next, FIG. 7 shows an application example in which the distorted rotating ring R as described above is utilized in a small compressor of a refrigeration system. In the compressor 10 shown in the figure, a distorted rotating ring R is disposed in an internal space 12 having a circular cross section of a casing 11, and the elliptical distortion of the distorted rotating ring R,
With the blade 13 appearing in and out of the internal space 12,
The inside of the internal space 12 is divided into a suction chamber 14 and a compression chamber 15, and the refrigerant from the suction port 16 is sucked into the suction chamber 14 by clockwise rotation of the elliptical strain of the strain rotation ring R, and then the refrigerant is drawn into the compression chamber 15. The compressed air is compressed and discharged from the discharge port 17. Therefore, since this small compressor 10 has a built-in drive source using the distorted rotation ring R in its rotation mechanism, there is no need to attach a compressor drive motor when it is installed in a refrigeration system. It is possible to reduce the price.

Moreover, if the rotation direction of the elliptical distortion of the distortion rotation ring R is changed to counterclockwise by the control circuit 6, the refrigerant suction and discharge directions are reversed.
When installed in an air-conditioner, as shown in FIG. 9, a refrigerant circulation circuit 21 that can perform a cooling/heating cycle with a compressor 10, an air conditioning load-side heat exchanger 18, a heat source-side heat exchanger 19, and an expansion mechanism 20. Therefore, there is no need to provide a four-way switching valve j for a compressor i whose discharge direction is constant, as in the conventional refrigerant circulation circuit h shown in FIG.

Moreover, since the number of sliding surfaces and moving parts is reduced, control responsiveness is improved and resonance vibration is reduced.
Further, as this resonance vibration is reduced, energy consumption is reduced, making it possible to save energy, as well as extending the service life and eliminating the need for lubrication.

To give a specific example of the capacity of the above-mentioned small extruder 10, the amount of displacement due to elliptical distortion of the distorted rotary ring R is 0.1 m/m, and the width of the distorted rotary ring R is 5 m/m.
m, and its average circumference is 10 m/m, and when the strain frequency is 1 KHz, the capacity is 400 kcal/hr (capacity equivalent to 300 c.c./min for a pump).

Moreover, FIG. 8 shows an example of application in which the distorted rotation ring R is used in a small motor. In the small motor 24 shown in the figure, a large number of leaves 8 are provided on the outer peripheral surface of the distorted rotation ring R.
a, 8a... are formed, and teeth 8a of the strained rotation ring R are formed on the outside of the strained rotation ring R.
A coaxial outer ring 25 having a large number of teeth 25a, 25a, . is rotated in the counterclockwise direction in the figure by the difference in the number of teeth with respect to the distorted rotation ring R, and the driven body is driven using this outer ring 25 as a drive shaft. Therefore, by using the distorted rotation ring R in the rotation mechanism of the motor, it is possible to eliminate the need for a field, an armature, etc., and it is possible to effectively reduce the size and weight of the motor.

When the distorted rotation ring R is used in the small motor 24 in this way, the amount of displacement of the elliptical distortion is small, and the control accuracy of the rotation speed and rotation angle becomes significantly high. For example, if the outer diameter of the distorted rotating ring R is 50 m/mφ and the displacement amount of the elliptical distortion is 0.1 m/m, then the distorted rotating ring R
The average diameter difference between the outer ring 25 and the outer ring 25, that is, the amount of movement of the outer ring 25 per rotation of the elliptic distortion is 0.1 m/m,
When the distortion frequency is set to 1KHz/sec, the outer ring 25
The rotation speed will be 120rpm. In this case, since the rotation angle of the outer ring 25 per 1 Hz of elliptical distortion is 0.72°, the control precision of the rotation speed and rotation angle becomes high. Therefore, this small motor can be used as a stepping motor for a robot arm, an electric expansion valve, a floppy disk unit of a personal computer, etc.

In the above embodiment, three strain generating means 5 _A to 5 _C of the strain rotating ring R are provided, but the number is not limited to three, and in order to rotate the elliptical strain, three or more may be used. Bye.

(Effects of the Invention) As explained above, according to the present invention, the rotating ring main body made of a piezoelectric element such as a flexible bimorph is deformed into an elliptical shape, and the elliptical distortion is rotated to improve the appearance. Since we have provided a rotating distortion rotation ring, it is possible to reduce the size and weight by eliminating the need for a motor field or armature, and when using a pump, it is possible to eliminate the need for a pump drive motor, resulting in a low price. It is possible to aim for Moreover, a compressor capable of forward and reverse rotation can be manufactured, and various secondary effects can be achieved, such as eliminating the need for a four-way switching valve in an air-conditioner or heating device, and simplifying a refrigerant circuit. Furthermore, since the rotational speed and rotational speed of the strain rotation ring are controlled with high accuracy, a coilless stepping motor with high reliability can be manufactured. Furthermore, by reducing the number of sliding surfaces and moving parts, it is possible to improve control responsiveness, energy saving, and quietness, and it is also possible to eliminate the need for lubrication.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention,
Fig. 1 is a diagram showing the main parts of the strain rotating ring, Fig. 2 is a structural diagram of the bimorph piezoelectric element, Fig. 3 is a diagram showing the connection status of DC current to the electrodes of the strain generating means, and Fig. 4 is a diagram of the control circuit. FIG. 5 is an electric circuit diagram showing the internal configuration, FIG. 5 is a time chart showing the opening/closing order of each contact of the control circuit, and FIGS. 6 a to 6 c are explanatory diagrams showing the rotation of the elliptical distortion. Figures 7 and 8 are main part configuration diagrams when applied to a small compressor and a small motor, respectively. Figure 9 is a refrigerant circulation system diagram when the small compressor shown in Figure 7 is installed in an air conditioner. FIG. 10 is a refrigerant circulation system diagram of a conventional air conditioner. R...distortion rotating ring, 1...rotating ring body,
2... Bimorph piezoelectric element, 2a... Piezoelectric plate, 3
_A , 3 _A ', 3 _B , 3 _B ', 3 _C , 3 _C '...electrode, 4...
DC power supply, 5 _A to 5 _C ... Distortion generating means, 6 ... Control circuit, 7 _A ... First contact, 7 _B ... Second contact, 7 _C
...Third contact, 10...Compressor, 24...Small motor.

Claims (1)

[Claims] 1 A rotary ring main body 1 formed of a ring-shaped piezoelectric element 2 such as a flexible bimorph, and a rotary ring main body 1 provided at three or more opposing parts across the center O of the rotary ring main body 1, A pair of electrodes 3 _A , 3 _A ′, 3 _B , 3 _B ′, 3 _C , 3 _C ′ are provided inside and outside each part of the electrode 3 _A , 3 _A ′, 3 _B , 3 _B ′, 3 _C ,
Strain generating means 5A, 5B, and 5C that distort each part outward by applying current to 3C _' ; and each strain generating means 5;
Electrodes 3 _A , 3 _A ', 3 _B , 3 for A, 5B, 5C
A strained rotating ring characterized by comprising strained rotating means 6 that distributes power in the order of circumferential positions of the rotating ring main body 1 of _B ', _3c , and _3c '.