JP4451688B2 - Damping device for electromagnetic pump - Google Patents

Description

  The present invention relates to a vibration damping device for an electromagnetic vibration pump. More specifically, the present invention relates to a vibration damping device for an electromagnetic vibration pump that can significantly reduce the transmission of vibration generated by driving the pump to the outside.

  Conventionally, electromagnetic vibration pumps have been used for the intake and exhaust of air into indoor air mats and air beds, the supply of oxygen in fish tanks and domestic septic tanks, and the sampling of inspection gases in pollution monitoring.

  As such an electromagnetic vibration pump, the present applicant has proposed a pump in which the casing of the electromagnet portion is formed of a resin mold as a pump capable of reducing the size of the pump, reducing the noise, and reducing the production cost ( Patent Document 1).

  As shown in FIG. 18, the pump described in Patent Document 1 includes an electromagnet (not shown) and a vibrator provided with a magnet in a housing portion 50 whose resin is molded on the outer surface. And the pump casing 51 provided with the suction chamber and discharge chamber which suck | inhale and discharge air is being fixed to the both ends of the housing part 50. As shown in FIG.

  In such a pump, a side cover 53 is fixed to a side surface of the pump casing 51 with a packing 52 interposed therebetween, and an attachment leg 54 is attached to the side cover 53 so that the pump body can be easily attached to an attachment site. Are integrated. A rubber stepped cushion 55 that absorbs vibration of the pump portion is attached to the mounting leg 54. In FIG. 18, reference numerals 56 and 57 denote an air suction portion and a discharge portion, respectively.

  In the electromagnetic vibration pump described in Patent Document 1, the diaphragms disposed at both ends of the vibrator are driven by the thrust of the vibrator, that is, the attractive repulsive force between the iron core of the electromagnet and the permanent magnet fixed to the vibrator. It vibrates in response to the pumping action. This vibration causes the pump body itself to vibrate in the X, Y, and Z directions, and the vibration is transmitted to the outside. In order to prevent or reduce such vibration, in the pump described in Patent Document 1, a stepped cushion having elasticity is attached between the pump body and the external mounting base.

  Further, as another example of the vibration isolator for the pump, there is a vibration isolating component 62 interposed between the outer periphery of the pump 60 and the inner periphery of the case 61 that accommodates the pump 60 as shown in FIG. It has been proposed (see Patent Document 2).

  The anti-vibration component 62 described in Patent Document 2 supports the pump 60 in the case 61, and fits the inner ring portion 63 having an inner peripheral shape that fits the outer surface of the pump 60 and the inner surface of the case 61. And an outer ring portion 64 having the circumferential shape. The inner ring portion 63 and the outer ring portion 64 are connected to each other by a plurality of bridges 65 including non-linear bridge elements, and the inner ring portion 63, the outer ring portion 64, and the bridge 65 are formed by integral molding of rubber. Have been made.

JP 2000-42072 A JP 2003-269333 A

  However, in the stepped cushion (vibration control device) of the electromagnetic vibration type pump described in Patent Document 1, vibrations in the X, Y, and Z directions generated from the pump main body are sufficiently prevented according to the increase in thrust and weight of the pump. Or there is a problem that it cannot be alleviated. If the spring constant of the stepped cushion is k and the weight of the pump body is m, the frequency f of the elastic body is

However, in order to increase the damping effect, the spring constant (k) of the stepped cushion must be reduced, so that the weight (m) of the pump body can be normally supported and maintained by the stepped cushion. It cannot be done and becomes a buckled state, which is counterproductive. This vibration is transmitted to the outside through the stepped cushion, and there is a problem that the pump hits the casing due to vibration, sound, and vibration at the time of transportation.

  Moreover, since the vibration-proof component described in Patent Document 2 supports the outer peripheral portion of the pump with a plurality of bridges, the spring constant can be reduced and the pump outer periphery can be supported, but the length of the bridge is structurally limited. (The case tends to increase in size when the bridge is lengthened), so there is a problem that the damping effect is small.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a vibration damping device for an electromagnetic vibration type pump that can greatly reduce the transmission of vibration generated by driving the pump to the outside. And

The vibration damping device for an electromagnetic vibration pump according to the present invention is based on a magnetic interaction between an electromagnet and a permanent magnet, and is used for an electromagnetic vibration pump that is driven by a vibrator having the permanent magnet at a power supply frequency. An apparatus, wherein two frames are arranged outside the pump along the drive shaft direction of the pump , and at least a part of the frame is engaged, and the pump is suspended from the frame. It comprises one of a string-shaped elastic body made of annularly formed natural or synthetic rubber for the frequency of the elastic body of the string-like is rather smaller than the drive frequency of the pump, the string-like elastic The body is engaged through a slit provided in the frame .

The string-like elastic body is preferably a tube .

  It is preferable that the frame is made of a strip-shaped plate material.

  It is preferable that the frame has a swing prevention tool.

According to the present invention, the pump main body is suspended from the upper part of the frame by the elastic body, and the length of the elastic body can be secured, whereby the frequency f ₁ of the elastic body can be easily reduced. it can.

As a result, the power drive frequency When f ₂ can be easily satisfied the relationship of f ₁ << f _2, it is possible to increase the damping effect of the pump.

  Further, the vibration damping condition can be easily adjusted by changing the length of the elastic body and the spring constant.

  Next, a vibration damping device for an electromagnetic vibration pump according to the present invention (hereinafter simply referred to as a vibration damping device) will be described in detail with reference to the drawings.

  1 is a perspective explanatory view of an embodiment of the vibration damping device of the present invention, FIG. 2 is a perspective explanatory view of a state where a pump is removed from the state shown in FIG. 1, and FIG. 3 is a vibration damping device shown in FIG. 4 is a partially broken front view, and FIG. 4 is a side view of the vibration damping device shown in FIG.

  As shown in FIGS. 1 to 4, the vibration damping device of the present invention includes a frame 1 disposed outside the pump P, and an elastic body 10 for suspending the pump P from the frame 1. Yes.

  The pump P is a pump of a type in which a vibrator provided with the permanent magnet is driven at a power supply frequency based on a magnetic interaction between an electromagnet and a permanent magnet. In this embodiment, both ends of the vibrator are used. However, the present invention is not limited to this, and as long as the diaphragm pump is driven in synchronization with the power frequency, other types such as a piston pump and a bellows pump are used. It is possible to apply to a type of pump.

  The frame 1 is made of a strip-shaped plate material made of a synthetic resin or a metal such as iron or aluminum. In the present embodiment, the frame 1 is 2 along the drive shaft direction of the pump P (see A in FIG. 1). One is provided. As shown in FIG. 4, the frame 1 has a substantially rectangular cross section (cross section perpendicular to the drive axis direction of the pump P), and the bottom surface 1a is fixed to the external mounting base 2 with screws, welding, adhesion, or the like. Has been. In FIG. 1, reference numerals 3 and 4 denote an air discharge port and a suction port, respectively, and a tube (not shown) is connected to the discharge port 3 so that air is supplied to parts such as an air mat and a fish tank. The The frame 1 can be made of, for example, a bar-like member (round bar, square bar, etc.) other than the plate material as shown in the figure.

  The width and thickness of the plate material constituting the frame 1 can be selected according to the size and weight of the suspended pump P. For example, a pump having a size of 18 cm × 7 cm × 7 cm and a weight of 2 kg is made of metal. In the case of suspending with two made frames, generally, the width is about 1 to 3 cm and the thickness is about 1 to 3 mm.

  The elastic body 10 may be made of any material as long as the pump P can be suspended. For example, natural or synthetic rubber, a metal spring such as a coil spring, or a synthetic resin spring. Etc. can be used.

  Further, the shape is not particularly limited, and a band or elongated body, a string, a tube, a coil, a waveform (see FIG. 8), and the like can be used.

  The frame 1 is formed with an engaging portion 1 b for fixing or locking the elastic body 10 to the frame 1. As the engaging portion 1b, those having various shapes can be used. As in the embodiment shown in FIGS. 1 to 4, the upper and lower slits (the portion connected to the edge of the frame 1 is narrow). There may be a substantially L-shaped slit having a wide back part), a hole as shown in FIG. 8, or an ellipse as shown in FIG. It may be a notch having a partial shape. Further, it may be a slit having a substantially constant width as shown in FIG. In the frame 1 shown in FIG. 8, an elastic body 10 made of, for example, a leaf spring can be used, and in the frame 1 shown in FIG. 9, the elastic body 10 made of, for example, a tube can be used. For example, an elastic body 10 made of a rubber band can be used in the frame 1 shown in FIG. Further, an elastic body made of a coil spring can be used in a frame having an engaging portion made of a hole as in FIG. 8 (see FIG. 11).

  The leg 5 provided on the bottom surface of the pump P is placed on the elastic body 10 (see FIG. 2) in a state where a part of the frame 1 is engaged and suspended. .

The vibration damping conditions (conditions for reducing vibration) in the vibration damping device using the elastic body of the present invention are f ₁ <<, where the frequency of the elastic body is f ₁ and the power supply driving frequency of the pump is f _2. it is f _2. That is that f ₁ is sufficiently small compared to f _2, usually, since f ₂ is 50 or 60 (Hz), as the f _1, so that the degree 1 to 5 (Hz) f ₁ Is preferably set. As described above, f ₁ can be adjusted by changing the length of the elastic body, the spring constant, and the like.

The vibration damping effect in the Z direction (vertical direction in FIG. 1) of the pump can be obtained by expansion and contraction of the elastic body. If the spring constant of the elastic body is k and the weight of the pump body is m, the frequency f _{1 of the} elastic body Is

It can be expressed as Further, the vibration damping effect in the X and Y directions of the pump can be obtained by vibration suppression by the elastic pendulum and the elasticity of the frame, where acceleration is g (980 cm / s ² ) and the elastic body length is l. The frequency f ₁ of the elastic body is

It can be expressed as

  In the present embodiment, the elastic body is prevented from coming off (displaced from the frame) or deforming due to shaking or collision during transportation, the pump body is missing, the air tube is detached, or the power supply lead wire is damaged. Therefore, a shake prevention tool 20 is provided on the external mounting base.

  The anti-sway tool shown in FIGS.

[Outside 1]

It can be produced by bending a metallic plate. As for the said shake prevention tool 20, one bending part 20a is inserted in the hole 6 of a pump main body with a space | gap, and the other bending part 20a is being fixed to the external mounting base 2 with the adhesive agent. Instead of using an adhesive, it can be fixed by welding or fixing means such as screws.

  2 to 4 prevent abnormal shaking of the pump P in the X, Y, and Z directions. Excessive abnormal shaking in the Y direction and Z direction can be prevented by the shock absorber 21 provided in the frame 1. As a material of the shock absorber 21, for example, urethane foam or a gel substance can be used. The shock absorber 21 can be fixed to the inner peripheral surface of the frame 1 with, for example, an adhesive.

  In the embodiment shown in FIGS. 1 to 4, the shake prevention tool 20 is a separate member from the frame 1, but a part of the frame 1 is cut and bent as shown in FIG. 5. Accordingly, the shake prevention tool 20 can be formed.

  FIG. 6 shows another embodiment of the vibration damping device of the present invention, which differs from the vibration damping device shown in FIGS. 1 to 4 through a pump mounting base 22 for mounting the pump P. Thus, a configuration in which the pump P is suspended is employed. Further, near the center of the pump mounting base 22, a shake preventing tool 30 is formed by cutting the pump mounting base 22 into a U shape and standing (see FIG. 7). The shake preventing tool 30 has a predetermined gap (for example, about 3 to 5 mm) and an inner peripheral edge of the through hole 31 in the through hole 31 formed in the external mounting base 2 facing the shake preventing tool 30. Has been inserted. The vibration preventing tool 30 and the through hole 31 prevent the pump P from abnormally shaking in the X direction and the Y direction. Then, abnormal shaking in the Z direction can be prevented by an impact absorber (not shown) provided on the inner peripheral surface of the upper frame 1 as in the embodiment shown in FIGS.

  For example, when a tube-like or string-like elastic body 10 is used, a slip prevention groove is provided in the leg portion 5 of the pump P with which the elastic body 10 abuts, the pump mounting base 22, and the like, and the elastic body 10 may be provided.

  12 to 14 show still another embodiment of the vibration damping device of the present invention, which is different from the vibration damping device shown in FIGS. 1 to 4 and uses a coil spring as the elastic body 10. ing. As the coil spring, in addition to the part in which the spring part 11 is partially formed as in the examples shown in FIGS. The length of the spring portion can be selected in consideration of the weight and necessary spring constant.

  The hook portion 12a formed at the upper end of the elastic body 10 is locked to the engagement portion 1b formed of a hole formed in the frame 1, while the hook portion 12b formed at the lower end is the bottom surface of the pump P. It is latched by the hole formed in the leg part 5 provided in this.

  In the present embodiment, a wall 1c is erected on the bottom surface 1a of the frame 1, and an impact absorber 21 is fixed to the inner surface of the wall 1c and the bottom surface 1a. As the shock absorber 21, one made of the same material as that shown in FIG. 4 can be used. These shock absorbers 21 can prevent excessive abnormal shaking of the pump P in the X, Y, and Z directions.

  Next, the vibration damping effect of the vibration damping device of the present invention and the conventional stepped cushion will be described based on experiments.

Example The pump was suspended using the vibration control device (suspending balancer) shown in FIGS. A silicone tube having an outer diameter of 6 mm and an inner diameter of 4 mm was used as the elastic body. The suspension length (the distance from the lower engaging portion to the bottom surface of the pump among the two upper and lower engaging portions, see L in FIG. 4) was 90 mm, and the weight of the pump was 2 kg.

Comparative Example The pump was supported using the stepped cushion described in relation to FIG. The material of the stepped cushion was EPDM, and its hardness was 50 Hs. The diameter of the support part (thickest part) at both ends was 12 mm, the diameter of the narrowed part at the center was 3 mm, and the mounting height was 14 mm. The weight of the pump was 2 kg.

  About the said Example and comparative example, the power supply frequency was changed in 2 Hz increments between 30-70 (Hz), and the vibration (G) of the X, Y, and Z direction was measured with the acceleration vibrometer. The pump was driven at the rated load (normal use load state).

  The results are shown in Table 1. Moreover, what plotted the result of Table 1 about the X direction, the Y direction, and the Z direction, respectively is shown in FIGS.

  In addition to the rated load, the magnitude of vibration when driven in a no-load state was determined. The results are shown in Table 2.

  As is clear from Tables 1 and 2 and FIGS. 15 to 17, it can be seen that the vibration damping device of the present invention by the suspension method can obtain a superior vibration damping effect as compared with the conventional stepped cushion.

  In the above-described embodiment, the frame disposed on the outer side of the pump is a frame that surrounds substantially the four circumferences of the pump. However, the present invention is not limited to these, for example, the four corners of the pump. A rod-like or plate-like frame is erected in the vicinity, and an engaging portion near the top of one side of the frame, and an engaging portion near the top of the other side of the frame that stands opposite to each other across the pump It is also possible to suspend an elastic body by using and to suspend the elastic body by disposing a pump on the elastic body.

It is a perspective explanatory view of an embodiment of a vibration damping device of the present invention. It is a perspective explanatory view of the state where the pump was removed from the state shown in FIG. It is a partially broken front view of the vibration damping device shown in FIG. It is side surface explanatory drawing of the damping device shown by FIG. It is a perspective explanatory view of a modification of the vibration damping device shown in FIG. It is a perspective explanatory view of other embodiments of the vibration damping device of the present invention. It is explanatory drawing which looked at the damping device shown by FIG. 6 from the bottom face side. It is explanatory drawing of the example of the frame in the damping device of this invention. It is explanatory drawing of the other example of the frame in the damping device of this invention. It is explanatory drawing of the further another example of the frame in the damping device of this invention. It is explanatory drawing of the other example of the elastic body in the damping device of this invention. It is a perspective explanatory view of further another embodiment of the vibration damping device of the present invention. FIG. 13 is a front view of the vibration damping device shown in FIG. 12. It is side surface explanatory drawing of the damping device shown by FIG. It is the graph which compared the damping effect of the damping device of this invention and the conventional stepped cushion about the X direction. It is the graph which compared the damping effect of the damping device of this invention and the conventional stepped cushion about the Y direction. It is the graph which compared the damping effect of the damping device of this invention and the conventional stepped cushion about the Z direction. It is a perspective view of a conventional electromagnetic vibration pump. It is sectional explanatory drawing of the damping component in the other conventional pump.

Explanation of symbols

P pump 1 frame 10 elastic body

Claims (4)

Based on the magnetic interaction between an electromagnet and a permanent magnet, a vibration damping device used in an electromagnetic vibration pump in which a vibrator provided with the permanent magnet is driven at a power supply frequency,
A frame disposed outside the pump along the direction of the drive shaft of the pump ;
The frame and at least partially engaged, and a string-shaped elastic member made of natural or synthetic rubber are formed into one ring for hanging from the frame of the pump, the cord frequency shaped for resilient body is rather smaller than the drive frequency of the pump,
A braking device for an electromagnetic vibration type pump, wherein the string-like elastic body is engaged with the frame via a slit provided in the frame . The braking device according to claim 1, wherein the string-like elastic body is a tube. The vibration damping device according to claim 1 or 2, wherein the frame is made of a strip-shaped plate material. The vibration damping device according to any one of claims 1 to 3, wherein the frame has a vibration preventing tool.

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