JPS59192873A - Vibration type compressing device - Google Patents

Abstract

PURPOSE:To obtain the most efficient discharging amount in accordance with a discharging pressure by a method wherein a vibration frequency and the rest time rate of an alternate signal, adapted to the detected discharging pressure of the compressor, are read out to generate an alternate current corresponding thereto. CONSTITUTION:A piston 21 effects a reciprocal vibrating motion by supplying an alternate execiting current to movable coils 31, 32. Accoding to this motion, external air is sucked through a suction pipe 27 and the compressed air is discharged out of a discharging pipe 26. The operation of the compressor 10 may be controlled most efficiently by controlling three parameters of the frequency of rectangular wave, generated from a constant voltage electric source through an inverter, and the reset time rates t1/T1, t2/T2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vibratory compressor equipped with a 1b control device for efficiently driving a vibratory compressor that sucks in, compresses and discharges gas by a piston mechanism driven by an alternating current. Regarding.

As the above-mentioned vibrating compressor (for example,
6- '574 publication or JP-A-56-1297
The one shown in Japanese Patent No. 80 is known. Such a compressor is basically used under a substantially constant discharge pressure, and is used, for example, as a refrigerant compressor for a small refrigerator, and its structure is simple. Since it can be used in various ways, various application ranges can be considered.

For example, air pressure is used to adjust the height of a car! 2!
It is possible to use it as a structure.

However, when used for vehicle height adjustment in this way, the discharge pressure at which the air compressor operates is not always constant, and the means for controlling the air compressor at variable discharge pressure becomes a problem.

This invention was made in view of the above points, and the piston mechanism that sucks in gas, compresses and discharges gas is controlled to vibrate and drive so as to obtain the most efficient discharge amount according to the discharge pressure. The present invention aims to provide a vibratory compression device.

That is, the vibratory compressor according to the present invention detects the discharge pressure from the vibratory compressor, reads the vibration frequency that matches the detected discharge pressure, and also the pause time ratio of the alternating signal, and determines the frequency and pause time. An alternating current corresponding to the ratio is generated, and this alternating current is used to drive the piston mechanism of the compressor back and forth.

An embodiment of this invention will be described below with reference to the drawings. 1
First, FIG. 1 shows the configuration of a vibratory compressor 10 that sucks in air, compresses it, and then discharges it.The upper and casings 12 and 13 are provided in a sealed state with respect to a cylindrical sleeve 1. A pressure accumulator container 14 is configured. A pressurizer main body 15 is provided in the pressure accumulator container 11ij5, and the main body 15 is supported within the container 14 by support brackets 16 and 17.

The compression fitting KJ5 is completely equipped with a sleeve 18 made of a ferromagnetic material arranged coaxially with the sleeve 11.
An upper cylinder 19 and a lower cylinder 20 are fixedly set to the inner side ILc of both ends of the cylinder 8, respectively. The upper and lower parts 81 (the cylinders 19 and 20 are arranged coaxially and the piston 21 is inserted and set, and this piston 2)
The cylinders 19 and 20 are communicated with each other by an air passage 22 formed in the central shaft portion of the cylinder.

A discharge valve 23 is provided inside the upper cylinder 19, and this valve 23 is normally connected to the 10 facing the piston 21 by a spring 25 interposed between it and a retainer 24 provided at the outer opening of the cylinder 19. A compressed air chamber is formed between the valve 23 and the retainer 24, and this air chamber is communicated with the retainer 24 and is connected to the upper casing 12. A discharge pipe 26 that passes through the pressure accumulator container 14 and is drawn out to the outside of the pressure accumulator container 14.
It will be communicated to.

Further, the lower cylinder 20 is provided with a check valve mechanism 28 that communicates with an intake pipe 27 that penetrates the lower casing 13 and is drawn out to the outside, so that only intake air is introduced into the lower cylinder 20. +11i is achieved.

A flange-shaped flange 29 is provided in a portion of the piston 21 located between the upper cylinder 19 and the lower cylinder 20. This flange 29 is integrally connected to a cylindrical stay 30 set on the outside of the upper cylinder 19, and moving coils 31, 32 are arranged parallel to the axis on the outside of this stay 30. ′! il - attach. Where is this moving coil? A stator core 33 is provided on the outer peripheral surface of the upper cylinder nozzle 9 corresponding to positions 2 and 32, and annular permanent magnets 34 and 35 are provided on the inner surface of the ferromagnetic sleeve 18 so as to face the stator core 33. The permanent magnets 34 and 35 are magnetized in the radial direction, and their 7 and 1 magnetic directions are opposite to each other. In fact, the winding directions of the movable coils 31 and 32 are reversed, and they are connected to each other.

The piston 21 is supported between the upper and lower cylinders 19, 2.0 using a Franz 29 section by a spring 36, 37 so as to be able to vibrate in the axial direction.

The excitation current for the moving coils 31, 32 is supplied to the terminal 38a.
, 38b, and the terminal 38a is connected to the conductor 39.
, conductive plate material 40. A coil 3 is connected via a spring 37 and a conductive plate 41.

32, and the terminal 38b is connected to the coil 31 and 32 through the conductor 42, conductive plate 43, spring 36, and isoelectric plate 44.

In the figure, 45 is a communication pipe formed through the upper casing 12, and 47 is a pressure sensor that detects the pressure inside the pressure accumulator container 14.

That is, in the compression+MlO configured in this way, by supplying an alternating excitation current to the movable coils 31 and 32, the piston 21 is caused to undergo reciprocating vibrational movement, and external air is sucked through the suction pipe 27. Compressed air is discharged from the discharge pipe 26.

In such a compressor 10, when considering the drive in response to changes in discharge pressure, the required stroke of the piston 21 is obtained by utilizing the resonance phenomenon of the vibration system. Therefore, as shown in the second factor (A), the discharge amount at a constant discharge pressure when constant power is supplied is a function of the vibration frequency. Also, the frequency f at the maximum discharge amount point A, ~A4
I-f4 is a function of discharge pressure. In this figure, Q,
~Q is the discharge amount immediately before the top of the piston 21 and the discharge valve 23 collide at the discharge pressures P and ~P4, respectively. Therefore, from this relationship, as shown in FIG. 2(B), the allowable applied voltages v1 to v4 at this time also become a function of the discharge pressure.

Therefore, in order for the compressor 10 to operate most efficiently in the range of discharge pressures P1 to P4 and to avoid collision of the discharge valve 23 with the top of the piston 21 and to operate stably, the maximum discharge at each discharge pressure must be maintained. Apply so as to satisfy the quantity Ql-Q4; , yo. , □ Rai. 8,3. . 8yo1,. 1□6o.

Is it necessary?

(-) in FIG. 3 shows the waveform of the main current supplied as the excitation current for driving to the movable coils 31 and 32 of compression (10). This waveform is a rectangular wave frequency waveform of one round ill T 6, The shape is such that it protrudes in the positive direction after the rest time 1tj t H in the period Tl, and in the negative direction after the rest time t2 in the period T2.

Now, when the compressor 10 is driven with the power supply voltage constant at V4, the discharge pressure PI=P shown in (A) and (B) in FIG.
In the region a, the drive frequency continuously varies the frequencies f1 to f4 at which the maximum discharge amount is obtained at each discharge pressure. Furthermore, by increasing or decreasing the pause period of the waveform shown in FIG. 3(A), even if the power supply voltage is constant at v4,
As shown in FIG. 3(B), the downtime ratio can be apparently lowered to v1 to v3 depending on the busyness.

Here, the pause period ratio α in FIG. 3(i) is determined as follows.

However, 0 times <1, and O<, -7≦1.

In other words, the frequency of the rectangular wave generated from a constant voltage power source such as a battery through an inverter and the rest time ratio t+/
By controlling the three noclameters T+ and t2/T2 in accordance with the specific force pressure, the compressor 10 can be driven and controlled most efficiently.

In addition, when performing apparent voltage control using the down time ratio as described above, for example, when the power supply voltage V4'tV3~V
When the pause time is determined to lower the discharge rate to 1, it is confirmed that a change in the distribution of this pause time to 11 and tz causes a large difference in the discharge amount, as shown in FIG.

This seems to be due to the increase/decrease in power loss depending on the timing of application to the moving coils 31 and 32. Therefore, the rest time t! required for voltage control at each discharge pressure! and tz
The compressor 10 can be driven with maximum efficiency at each discharge pressure by controlling the distribution ratio between the pressure and the pressure so as to obtain the optimum application timing.

FIG. 5 shows the optimal rest time for efficiently driving the compressor 1θ according to the discharge pressure, that is, the voltage application rest time ratio β and β, (where β1 is a function of t I / T ( β2 is a function of t2/T2), and the driving frequency f
shows the relationship between That is, βl, β2, and f with the discharge pressure shown in FIG. ) The compressor 10 can be controlled most efficiently by obtaining an excitation drive current having a waveform as shown in FIG.

FIG. 6 shows a drive circuit that supplies excitation current to the moving coils 31 and 32 of the compressor 10.
A detection signal from a pressure sensor 47 that detects a discharge pressure of 0 is given to a control circuit 48 as a command signal. and,
This control circuit 48 includes transistors 49, 50 and 5.
1°52, the polarity of the moving coils 31 and 32 connected in series is reversed at a specified period.・
Flowing.

Figure 7 is 1iill? The ai1 circuit 48 section is shown in more detail, and the detection signal from the sensor 47 is as follows:
1.1'i and the raw circuit 480, and this circuit 480
outputs a constant frequency pulse number 13 to the binary counter 481 and outputs an address signal to the pause time setting circuit 482.

That is, this No. 18 46 raw circuit 480, for example, CI
) U, memory, IO port, etc. In the memory, the address of the frequency f and rest time for operating the compressor 10 at maximum efficiency at each discharge pressure as shown in Fig. 5 is stored. (described later) is stored. Then, depending on the number 1g from the pressure sensor 47, one of them
The i° signal is output as a pulse signal to the q initial counter 481 and the pause time setting circuit 482.

Here, the binary counter 481 outputs an n-bit generation circuit 480 to the binary counter 48. This Guinari Kaunk 48no has sent an address to ■eO■1483 (
This ROM 483 contains an initial signal corresponding to a rectangular wave V. That is, in response to No. 71711g from the nominal counter 480, 1
1>1, the input signal stored at that address, specifically, the j corresponding to the detected pressure of the pressure sensor 47
The unused signal that forms a rectangular wave signal with a closed wave number is also extracted and outputted, and converted into an analog signal by a D/A converter 484 to form a rectangular signal. Then, this analog-converted rectangular wave No. 16 is set to a level by an amplifier 485 with a width of θ", and this signal is sent to a NOR circuit 486, and then inverted overnight and supplied to a NOR circuit 487. 0 Here, the relationship between the address signal output from the binary counter 481 and the output waveform output from the multiplier 485 is as shown in the eighth section 1.

At rest, the 1141 setting circuit 482 is the Hakugou beef circuit 480.
For example, from address 0 to address (0≦
■(≦N), and from address N+1 to address P (NguP≦Z
) is defined as a voltage application suspension period, the address corresponding to this suspension period and the address signal output from the binary counter 481? Always compare with the number. When the address signal corresponding to the voltage pause 1υ''1iflVζ is detected, the pause time setting circuit 482 provides a dart signal to the NOR circuits 486 and 487.

- In the Noah turning tower 486, the Noah logic output of the A1-7 bow output from the 1911 width switch and the output address No. 6 from the pause time setting circuit 482 is obtained, and the Jz, l mandatory transnoster 488 is controlled. The transistors 49, . 50 on, off: li! I control. Well, the NOR circuit 487 performs a NOR logic between the signal output from the r1 amplifier 485 and inverted by the inverter and No. 16 output from the pause time setting circuit 482, and turns the 1 and 3 small b transistors 489 into lB11. The transistors 51 and 52 are turned on and off.

That is, the moving coil 31.32VC is (A) in Fig. 3.
As shown in FIG. 2, an excitation alternating current with a specifically set pause time tl+t2 is supplied.

As described above, according to the present invention, a vibratory compressor that causes a piston to reciprocate vibrating motion using an alternating excitation current, sucks in air, compresses it and discharges it, can be operated at the most efficient frequency and rest time corresponding to the discharge pressure. It is designed to supply a ratio of excitation current for driving, and it becomes possible to control and drive the compressor of this pile particularly efficiently when the discharge pressure changes.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional diagram illustrating a compressor applied to a vibratory compression device according to a one-off embodiment of the present invention, and Fig. 2 (A) and (B) are respectively the above-mentioned compressor 6. A diagram showing the relationship between the discharge amount and the vibration frequency with respect to the discharge pressure in the compressor, as well as the relationship between the voltage applied to the ♂♂ volume, and (A) in Figure 3 is a diagram showing the waveform of the drive excitation 7) 1 flow for the compressor. (B) in the same ward
is a diagram showing the relationship between the pause M amount ratio and the applied voltage in the above waveform, Figure 4 is the same (Fig. FIG. 6 is a diagram showing the drive circuit of the compression circuit, FIG. 7 is a diagram showing the control circuit section of the 11-speed quadruple circuit in more detail, and FIG. is a diagram showing the relationship between the rectangular wave analog signal and the address corresponding to binary counting in the control circuit. 10... Compressor, 14... Pressure accumulator container, 21... Piston, 26... Discharge. Tube, 27... Suction tube, 3). 32... Moving coil, 47... Pressure sensor, 48...
...Control circuit, 480...Signal generation circuit, 48...
・Binary counter, 482... Pausing time setting circuit,
483...ROM.

Claims (1)

[Claims] A vibratory compressor uses a piston mechanism that reciprocates with an alternating current to suck in air from outside the pressure accumulator container and sends out compressed gas from a discharge port formed in the container. Means for storing the frequency of the alternating current and the turn of the rest time ratio for obtaining the discharge amount, and means for detecting the discharge pressure and reading out the frequency and rest time ratio corresponding to the detected discharge pressure from the memory means. and means for forming an alternating waveform corresponding to the frequency and rest time ratio read by the means, and supplying an excitation current corresponding to the alternating waveform to the piston drive coil of the compressor. Equipped with a vibrating compression device.