JPS6112440A - Resonance reciprocating device - Google Patents

Abstract

PURPOSE:To improve mechanical efficiency through resonation of a reciprocating device such as engines, by a method wherein the spring constant of a spring resiliently supporting a vibrating body is varied by a current applied on an electromagnet, and the natural frequency of a vibrating system is controllable. CONSTITUTION:A vibrating body 1, having a proper weight, is secured to the central part, located in a casing 2, of a slide shaft 4 which is emerged from the upper and the lower end of the casing 2 through a slide bearing 3, and coil springs 5 having a specified spring constant are resiliently mounted between each of the two ends of the vibrating body 1 and each of the end plates of the casing 2. Slide rods 6 of non-magnetic material are connected to both ends of the slide shaft 4. 4 slide branches 6a, branched from the slide rod 6 and extended in parallel to the slide shaft 4, are guided in V-slide grooves 8 axially formed in surfaces of a square slide member 7 of a non-magnetic material. Each of electromagnets 9 is secured outside each slide groove 8, and an outside part 10, surrounded with each electromagnet 9, the slide groove 8, and the slide branch 6a, of the slide groove 8 is filled with a magnetic fluid 11.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a resonant reciprocating device, which is attached to an engine of an automobile, etc., and is used to improve mechanical efficiency in reciprocating devices such as generators, compressors, and pumps. The purpose is to save energy.

[Conventional technology]

Various types of resonance devices using springs have been used in the past, but since the spring constant of the spring cannot be changed,
This device can only resonate at its natural frequency, and cannot be used as a resonant reciprocating device for devices whose frequency constantly fluctuates, such as automobile engines.

[Problem that the invention seeks to solve]

The present invention constantly corresponds to the vibration frequency of reciprocating engines, etc.
The purpose is to maximize the kinetic energy of the engine.

[Means for solving problems]

The present invention constitutes a follow-up type resonant reciprocating device by making the spring constant of a spring variable, and in which a non-magnetic movable end of the spring is slidably contacted with a non-magnetic sliding member, The sliding contact pressure is applied by a magnetic fluid that is excited and aggregated by an electromagnet, and the apparent spring constant of the spring is changed by a current applied to the electromagnet, so that the natural frequency of the entire vibration system including the spring is varied. It is.

[For production]

The spring constant changes depending on the current applied to the electromagnet, and the natural frequency of the vibration system can be freely controlled, so it can be connected to various reciprocating devices such as automobile engines that fluctuate in frequency to cause resonance. It is.

[Embodiment 1] Hereinafter, a first embodiment of the resonant reciprocating device of the present invention will be described with reference to FIGS. 1 to 5.

(1) slides from the lower end of the machine casing (2) to the sliding bearing (3) (3).
) is a vibrating body of appropriate weight fixed in the center of the machine housing (2) of 0, and both ends of the vibrating body (1) and the end plate of the machine housing (2) Coil springs (5) (5) each having a constant spring constant are elastically mounted between them to stably hold the vibrating body (1) in a neutral position.

(El) (6) is a non-magnetic sliding rod connected to both ends of the sliding shaft (4), and extends parallel to the sliding shaft (4) branched from the sliding rod (6). 4 wooden sliding branches (6a) (
6a) - Fist - is a square prism-shaped non-magnetic sliding member (7) V-shaped sliding groove (Ill) configured in the axial direction of each surface (8)
It is located along... (8) is a magnetic pole on the outside of each of the above-mentioned sliding grooves (8).
), and a magnetic fluid is attached to the outer side (10) of the sliding groove surrounded by each electromagnet (9), the sliding groove (8), and the sliding branch (6a). (11) is filled. Note that (12) is a frequency detection sensor.

The resonant reciprocating device having the above configuration is defined as = 4π2 Mll f2 However, since the viscosity of the magnetic fluid (11) changes depending on the magnetic susceptibility and adds sliding resistance to the sliding arm (6a), the spring constant of the above vibration system and the magnetic fluid (11)
The relationship when current (i) is passed through the coil (13) of the electromagnet (8) is determined in advance from experimental values as shown in FIG. The current adding circuit that flows through the coil (I3) of the electromagnet (8) consists of multiple resistors (R1, R2e...R...@) connected in parallel and series with the resistors, as shown in Figure 4. Connected transistors (Trl, Tr2...Tr
) form a switching circuit, and the switching signals (El, E2...Ej...) from the control circuit shown in FIG. 5 are sent to the coil (13).
) is applied an appropriate current (i) selected by
When one transistor (T r j) of the switching signal (Ej) is turned on by the control circuit, the other transistors are turned off.
kept in condition.

That is, when the external vibration frequency is detected by the sensor (12) and input to the control circuit, it is internally processed as shown in the flowchart of FIG. Therefore, when the excitation current (i) calculated from the detected frequency exceeds the station of the digitally divided Δi value (the smaller the divided value, the vibration is closer to the true resonance frequency), The transistor (TrJ) corresponding to the current (i) is selected in the current addition circuit (Fig. 4) and output from the control circuit to apply the base voltage (EJ), and at the same time as switching, the frequency is detected again. . Further, if the frequency does not exceed % of the Δi value, the frequency is detected again, and the vibration system including the vibrating body (1) can be caused to resonate by the above control.

[Embodiment 2] FIG. 6 shows another embodiment of the present invention, in which a vibrating body (1
) in place of the permanent magnet (14), and a coil (
15).

That is, when the generator vibrates the vibration system with external power, the permanent magnet (
The vibration system including 14) resonates and can efficiently generate electricity.

〔Effect of the invention〕

According to the resonant reciprocating device of the present invention, the resonance follows the frequency applied from the outside, so it is useful as a resonant reciprocating device for a device whose external drive source constantly fluctuates in frequency, such as an automobile engine. Vibration energy can be extracted effectively.

In addition, the present invention can provide a structure that can increase the mechanical efficiency of not only the generator disclosed in the embodiments but also a resonant drive system of various devices such as reciprocating compressors and pumps. The effects of the present invention are extremely large.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a vibration system showing a first embodiment of the device of the present invention, Fig. 2 is a cross-sectional view of a sliding member, and Fig. 3 is a diagram showing the spring constant and current (i) of the vibration system. 4 is a circuit diagram of a current adding circuit, FIG. 5 is a block diagram of a control circuit, and FIG. 6 is a front sectional view of a main part showing a second embodiment of the present invention. (1) Vibrating body (0 sliding shaft (5) coil spring (θ) sliding rod (7) sliding member (8) sliding groove (8) electromagnet (12) frequency detection sensor (14) permanent magnet (15) Coil JP-A-Sho G1-12440 (4) Figure 3

Claims (1)

[Claims] A movable end protruding in the vibration direction from a vibrating body elastically supported in the vibration direction by a spring is brought into sliding contact with a sliding member made of a non-magnetic material, and the sliding contact pressure is applied via a magnetic fluid excited and aggregated by an electromagnet, A resonant reciprocating device characterized in that the electric current of the electromagnet is adjusted to vary the apparent spring constant of the vibrating system including the vibrating body, so that it constantly resonates with externally applied vibrations.