JP2012036789A - Electromagnetic vibration type pump - Google Patents

Abstract

A compact electromagnetic vibration pump capable of preventing vibration and noise due to air pulsation with a simple configuration.
An electromagnet 21 and a vibrator 22 to which a permanent magnet 22a is fixed are made to face each other, and the polarity of the electromagnet 21 is changed by an AC power supply to vibrate the vibrator 22 to send out air. A tank 3 for temporarily storing the sent air is connected. An air discharge pipe 33 is provided on one wall surface of the tank chamber 31. In this tank chamber 31, the rectifying pipe 1 is provided so as to be directly connected to the discharge pipe 33. The rectifying pipe 1 is provided so that a plurality of small holes are arranged in parallel in the cylindrical body 11 or the plate-like body and penetrates toward the discharge pipe 33.
[Selection] Figure 1

Description

  The present invention relates to an electromagnetic vibration type pump, such as a diaphragm pump or a piston pump, that drives an electromagnet with an alternating voltage to change the polarity of the electromagnet to vibrate a diaphragm or a bellows to send air. More specifically, the present invention relates to an electromagnetic vibration pump that can suppress vibration and noise associated with air pulsation due to electromagnetic vibration and can quietly supply air to an ornamental water tank, a fish tank, a domestic septic tank, and the like.

  As shown in FIG. 9 which is a schematic diagram of an electromagnetic vibration pump assuming a diaphragm pump having diaphragms on both sides, for example, the electromagnetic vibration pump has a discharge port for supplying the pump 51 and air discharged from both sides of the pump 51. A merging chamber 52 that merges through 51 a and a tank 53 that temporarily stores air via a discharge port 53 a are provided, and a discharge pipe 54 is provided on one side wall of the tank 53. A hose or the like is connected to the discharge pipe 54 so that air is supplied to a water tank (not shown), for example, for viewing (for example, see Patent Document 1).

  As described above, this electromagnetic vibration type pump vibrates a diaphragm or the like by vibration of a permanent magnet provided facing the electromagnet based on a change in polarity due to an alternating electric field of 50 Hz or 60 Hz of the electromagnet, and accompanies the vibration of the diaphragm. The air is sent out by air compression and expansion. Therefore, the vibration of the diaphragm vibrates along the sine waveform of the AC voltage, and the air that is sent out is strong along the sine waveform at the peak portion, and weak at the portion where the voltage is zero (the portion where the polarity of the voltage changes). Sending out. The air sent out in this way is temporarily stored in the tank through the merge chamber 52 and is subjected to a certain amount of pressure. However, the fact that the air is discharged from the discharge pipe 54 means that the pump 51 When air is discharged, air is pushed out from the tank 53 to the discharge pipe 54 by the pressure. Therefore, the air stored in the tank 53 becomes a kind of elastic body, and the strength of the pressure transmitted to the discharge port 53a is directly transmitted to the discharge pipe 54 with the entire air in the tank 53 as one elastic body. 54, air is discharged in accordance with the discharge timing from the pump 51. As a result, as shown in FIG. 10, for example, the discharge pressure of the discharge pipe 54 has a strong and weak waveform according to the waveform of the electromagnet voltage, and pulsates without a constant pressure.

  As a method for preventing such pulsation, for example, in the case of a pump of 40 liters / min, the tank capacity is increased to 500 ml (milliliter) or a perspective view excluding the upper surface of an example of the tank 53 is shown in FIG. As shown in the drawing, it is conceivable to divide the inside of the tank 53 into small chambers 533 by a partition plate 531, and to form notches 532 in the partition plate 531 so that air sequentially advances through the small chambers 533.

  Results of measurement of pressure fluctuation values when the capacity of the tank is varied, when the normal pressure (average pressure of the air discharged by the pump load) is 12.8 kPa with the configuration of FIG. Table 1 shows mV: pressure difference converted at 40 mV = 1 kPa). In Table 1, in the case of C, a vinyl chloride pipe having an inner diameter of 50 mm and a length of 250 mm was used as a tank, the nozzle diameter of the connection was an inner diameter of 13 mm and an outer diameter of 18 mm, and in the case of D, the inner diameter was 80 mm and the length was 400 mm. Nozzle diameter is used and the nozzle diameter is 13 mm inside diameter and 18 mm outside diameter.

  Thus, if the capacity of the tank is increased, the difference in the discharge pressure from the pump 51 is absorbed by the compressed air in the tank 53, and the pulsation is reduced in the discharge pipe 54. No effect. Further, if the inside of the tank 53 is partitioned into small chambers by the partition plate 531, even if there is a difference in the discharge pressure by passing through the small chambers 533, the time when the discharge pressure is different and reaches the discharge pipe 54, The pressure difference is reduced, the pressure difference as shown in FIG. 10 is reduced, and pulsation can be suppressed.

Utility Model Registration No. 3161068

  As described above, when the capacity of the tank is increased to, for example, about 500 ml, the pulsation can be suppressed considerably. However, the electromagnetic vibration type pump itself is increased in size, and it is desired to reduce the volume of the pump in recent years. It will go against the request of the conversion. Further, if the tank is divided into small rooms by the partition plate described above, the pulsation can be suppressed with a relatively small size, but it is difficult to form the partition plate if, for example, the capacity of the tank is reduced to about 1/2. Thus, not only the cost is increased, but also the suppression of pulsation is not sufficient, and there is a problem that vibration and noise are generated when air is supplied to an ornamental water tank, a domestic septic tank, and the like, resulting in discomfort.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a small electromagnetic vibration type pump that can suppress vibration and noise due to air pulsation with a simple configuration.

  The electromagnetic vibration type pump of the present invention includes an electromagnet and a pump that sends out air by vibrating the vibrator by changing the polarity of the electromagnet with an alternating current power source, with the vibrator fixed to the permanent magnet, and the pump An electromagnetic vibration type pump having a tank for temporarily storing air sent from the tank and a discharge pipe for discharging air provided on one wall surface of the tank, and is directly connected to the discharge pipe in the tank As described above, a rectifying pipe is provided, and the rectifying pipe is provided so that a plurality of small holes pass in parallel toward the discharge pipe.

  The small hole provided in the rectifying pipe is formed so as to satisfy 10 ≦ L / D ≦ 30 in relation to the diameter D of the small hole and the length L of the small hole, thereby suppressing pulsation. Especially convenient.

  The tank comprises an external tank connected to the pump via a hose, or a small tank formed integrally with the pump and an external tank connected to the small tank by a hose. The rectifier tube may be provided in the case.

  According to the present invention, since the rectifying pipe provided with a plurality of small holes in parallel is provided in front of the discharge pipe so that the air discharged into the tank passes, it is pushed out by the pressure of the pump. Even if it is transmitted to the air stored in the tank by the air whose pressure is large or small, the air having large or small pressure is separated into each small hole of the rectifying pipe, By separately moving toward the discharge pipe, the air that has passed through each small hole of the rectifying pipe changes its pressing force. As a result, the pressure change is compressed and the pulsation of the entire air reaching the discharge pipe is reduced. Get smaller.

  Further, the larger the hole diameter D (L / D) with respect to the length L of this small hole is, the more preferable for averaging the pressing force. However, if this value becomes too large, the pressure loss increases and the flow rate of discharged air decreases. To do. At this time, for example, in an electromagnetic vibration type pump that discharges a flow rate of 40 liters / min, it is generally assumed that the flow rate should not decrease by 10% or more, and L / D is 10 to 30. Is preferred.

It is a schematic sectional explanatory drawing which shows an example of the diaphragm type pump which is one Embodiment of the electromagnetic vibration type pump of this invention. It is explanatory drawing which shows the example of the rectifying pipe of the electromagnetic vibration type pump of this invention. It is explanatory drawing which shows the other example of the rectifier pipe of the electromagnetic vibration type pump of this invention. It is a block diagram which shows the outline of the measuring apparatus of the fluid pressure in a fixed distance from a discharge pipe. It is a figure explaining the principle by which the pulsation at the time of using the rectifier tube of this invention is suppressed. It is a figure which shows the outline | summary of the apparatus which measures the noise at the time of using the rectifier pipe of this invention. It is a figure which shows the noise of the electromagnetic pump of this invention shown by FIG. 1 in contrast with the noise of the electromagnetic vibration type pump of the structure which attached the tank which does not have a partition plate with the conventional 280 ml. It is a figure which shows the change of a pressure fluctuation ((DELTA) p) and an airflow fall when changing the length of a rectifier pipe. It is explanatory drawing which shows the outline of the conventional electromagnetic vibration type pump. It is a figure explaining the pulsation which arises with the conventional electromagnetic vibration type pump. It is explanatory drawing of the example which suppresses a pulsation with the conventional electromagnetic vibration type pump.

  Next, the electromagnetic vibration pump of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory diagram of a diaphragm type electromagnetic pump which is an embodiment of an electromagnetic vibration type pump according to the present invention. In FIG. 1, an electromagnet 21 and a vibrator 22 fixed with a permanent magnet 22a are opposed to each other, and the polarity of the electromagnet 21 is changed by an AC power supply to vibrate the vibrator 22 and send air to the pump 2 A tank 3 for temporarily storing the sent air is connected. A discharge pipe 33 that discharges air is provided on one wall surface of the tank 3. The present invention is characterized in that the rectifying pipe 1 is provided in the tank 3 so as to be directly connected to the discharge pipe 33. As shown in FIGS. 2 to 3, the rectifying pipe 1 is provided such that a plurality of small holes 12 are arranged in parallel with the cylindrical body 11 or the plate-like body so as to penetrate toward the discharge pipe 33.

  As shown in FIG. 2A, the rectifying pipe 1 is a honeycomb pipe in which a plurality of small holes 11a are formed in a recessed portion 12a of a pedestal portion 12 having a recessed portion when the tank 3 is manufactured by casting or the like. By inserting the cylindrical body 11 or the plate-like body such as, the small hole 11a is formed so as to coincide with the position of the discharge pipe 33. Therefore, the pedestal portion 12 is formed of aluminum die casting or plastic, but the cylindrical body 11 and the plate-like body are made of plastic such as silicone tube or elastomer, or metal material such as aluminum or stainless steel. it can. Any material can be used as long as it is a material that is easy to process the small holes 11a and hardly corrodes.

  The shape of the small hole 11a may be any shape as shown in FIGS. 2 to 3, whether the cross-sectional shape is circular, oval, quadrilateral, hexagonal honeycomb, or the like. . The plurality of small holes 11a can be the same size. In the example shown in FIG. 2B, a small hole 11a is formed in the outer peripheral portion of the metal pipe 11 having a slightly elliptical cross section along the circumferential direction, and a small hole 11a is formed in a plastic such as an elastomer at the center. , 11b is inserted into the plastic body 11c. Since the small hole 11a provided in such a metal pipe and the small hole 11a provided in the plastic at the center part are slightly different in the air flow method, pulsation can be suppressed. In addition, as shown in this example, by mixing the small hole 11a and the small hole 11b slightly larger than that, the air flow method differs depending on the size of the hole, and the pulsation is further suppressed. Can do. In this example, when the size of the tank is about 280 ml, the horizontal diameter (short diameter) D1 is about 6 to 8 mm, and the vertical diameter (long diameter) D2 is about φ8 to 10 mm. L is about 10 to 30 mm, the diameter of the small hole 11a is about φ1 to 1.2 mm, and the diameter of the small hole 11b is about the same as the small hole 11a of about φ1 to 1.2 mm. It can also be a different size.

  The example shown in FIG. 2C is an example in which a small hole 11a is formed in a plate-like body 11d made of, for example, an elastomer and having a thickness of about t = 3 mm. Although such a plate-like body 11d is shorter than the length L of the cylindrical body 11 described above, there is an insertion effect as will be described later, and a plurality of such plate-like bodies 11d are arranged at intervals. Alternatively, the same effect as that of the cylindrical body 11 can be obtained while being easily manufactured by being inserted into the recess 12a of the pedestal portion 12 continuously.

  The example shown in FIG. 2D is an example in which a small hole 11a having the same size is provided in a cylindrical body 11 made of, for example, a silicone resin. In the figure, a portion surrounded by two lines is made of resin. It is a part, and other parts are holes. That is, circular small holes 11a are formed densely at regular intervals, and there are ring-shaped resin portions 11e with a constant width around them, and a gap 11f between adjacent resin portions 11e is also a through hole. . However, only the circular small hole 11a may be a through hole, and the adjacent small holes 11a may be all resin portions. From the viewpoint of the manufacturing process, a structure in which a large number of tube through holes are formed in a cylindrical column body is simpler, but the same effect was obtained with such a structure.

  3 (e) to 3 (h) have the same configuration as that of FIG. 2 (d), and only the shape of the small hole 11a is different. In addition, 11g is also a through-hole. Thus, the size and shape of the small hole 11a can be arbitrarily selected.

  As shown in FIG. 1, the pump 2 is provided so that an electromagnet 21 is opposed in a casing (abbreviated and indicated by a line in the drawing) 20 a, and vibration is generated between the opposed electromagnets 21. In the example shown in FIG. 1, two sets of plate-like permanent magnets 22a are fixed to the vibrator 22 so as to face the electromagnets. A diaphragm 24 is fixed to both ends of the vibrator 22, and an outer periphery of the diaphragm 24 is fixed to the casing 20 a so that the diaphragm 24 swings to the left and right as the vibrator 22 vibrates left and right. . A pump casing 20b is provided outside the diaphragm 24 in the same manner as the casing 20a, but is omitted in the figure. A pump chamber 25, an intake chamber 26, a discharge chamber are provided in the pump casing 20b. 27 is formed, and the suction chamber 26 is provided with a suction valve 26a for feeding air into the pump chamber 25 and a suction port 26b for sucking air from the outside, and air is fed into the discharge chamber 27 from the pump chamber 25. A discharge port 27 b for discharging air is formed in the discharge valve 27 a and the merge chamber 28. In FIG. 1, the air discharged from the discharge ports 27a of the left and right pump chambers 25 is sent to the merge chamber 28 and merges. The merge chamber 28 communicates with a tank 31 that stores air via a communication port 32, and has a structure capable of discharging air from a discharge pipe 33 in accordance with the pressure in the tank 31.

  Although it is discharged through the tank 31 as described above, the air in the tank 31 is pushed out by the discharge accompanying the vibration of the diaphragm 24, so that the air is discharged along with the vibration of the diaphragm 24 as described above. If the rectifying tube 1 is not inserted, pulsation cannot be suppressed. In this example, air from the right and left discharge chambers 27 is collected in the merge chamber 28 and sent to the tank 31. However, such a merge chamber 28 is not intentionally provided, and the tank is directly separated from the left and right discharge chambers 27 separately. It is also possible to adopt a structure for feeding to 31. In addition, the tank 31 is not necessarily configured integrally with the pump 2 but can be connected by a hose or the like and provided with an external tank.

  In the example shown in FIG. 1, the electromagnet 21 has an exciting coil 21b wound around the central portion 21c of the E-type iron core 21a, and the tip of the central portion 21c of the E-type iron core 21a corresponds to the current direction of the exciting coil 21b. Thus, the polarity of the N pole or the S pole appears, and the S pole or the N pole having the opposite polarity to the tip of the center portion 21c appears at the tips of the both ends 21d of the E-type iron core 21a. On the other hand, the vibrator 22 is formed by fixing a permanent magnet 22a in the vicinity of a position facing a coil winding portion of a rod or plate-like vibration shaft 22b made of, for example, plastic or aluminum. As shown in FIG. 1, the two permanent magnets are fixed so that the polarities are in different directions. With this configuration, when an alternating voltage is applied to the exciting coil 21b, the direction of the current flowing through the exciting coil 21b changes depending on the positive and negative AC voltages. Therefore, the magnetic poles appearing at the tip of the central portion 21c of the E-type iron core 21a appear alternately in the N pole and the S pole in accordance with the phase of the AC voltage. As a result, for example, as shown in FIG. 1, if the magnetic pole appearing at the central portion 21c of the E-type iron core 21a has an N-pole phase, the S-pole of the permanent magnet 22a of the vibrator 22 is attracted to the center side. The vibrator 22 moves so that the pole moves away from the center. If the phase of the AC voltage is reversed, the direction of the current is reversed and the S pole appears at the center portion 21c. Therefore, the vibrator 22 moves so that the north pole of the permanent magnet of the vibrator 22 is attracted and the south pole is away. As shown in FIG. 1, the polarities of the electromagnet 21 and the permanent magnet 22a are configured so that the polarities are reversed between the upper part and the lower part of the drawing with the vibration shaft 22b interposed therebetween.

  As a result, the vibrator 22 vibrates in accordance with the phase of the AC voltage. For example, when the vibrator 22 moves to the right side in FIG. 1, the right pump chamber 25 is compressed, and air opens the discharge valve 27a to open the discharge chamber. Move to the 27th side. When the phase of the AC voltage changes and the vibrator 22 moves to the left side, the right pump chamber 25 expands and the pressure decreases, so that air flows from the intake chamber 26 by opening the intake valve 26a. The air intake chamber 26 maintains normal atmospheric pressure because air is supplied from the outside through the air intake port 26b. In order to repeat this operation with an alternating voltage, air is successively sent out from the left and right pump chambers 25 and supplied to the tank 31 via the junction chamber 28. As a result, air is sent out from the discharge pipe 33 when a pressure controlled by a valve (not shown) connected to the discharge pipe 33 of the tank chamber 31 is exceeded. The present invention is characterized in that when air is discharged from the tank 3, it is sent to the discharge pipe 33 through the rectifying pipe 1 as described above.

  The pump shown in FIG. 1 is a diaphragm type electromagnetic pump having pump chambers 25 on both the left and right sides. However, even if it is a diaphragm type, a diaphragm is provided only on one of the left and right sides, and no diaphragm is used. Even in a piston-type pump using a bellows or the like, pulsation is inevitable, and the present invention can be similarly applied.

  When the rectifying pipe 1 shown in FIGS. 2B and 2C is used in the electromagnetic vibration pump having the structure shown in FIG. 1, the case of (b) is I and the case of (c) is II. By examining the air pressure difference Δp (the difference between the maximum pressure and the minimum pressure, the unit is mV), the pulsation in the discharge pipe 33 is not provided with a partition plate in the conventional tank. It was compared with the degree of pulsation of the one that did not take the above measures (referred to as III). Note that the honeycomb tube of FIG. 2B is a case where D1 is φ8 mm, the diameter of the small hole 11a is φ1 mm, and the length L is 20 mm, and FIG. 2C is a case where the thickness t is 3 mm. . Further, not the structure of FIG. 2B but the structure similar to that of FIG. 2D and having a structure in which a large number of through-holes are formed in a cylindrical body gave almost the same result. The results are shown in Table 2 (50 Hz) and Table 3 (60 Hz). In addition, this measurement was investigated by the structure as shown in FIG. That is, in FIG. 4, the valve 41 and the mass flow 42 are connected to the discharge pipe 33 of the electromagnetic vibration type pump through a vinyl chloride pipe having an inner diameter of φ14 mm, and the position is about 50 mm from the discharge pipe 33 in front of the valve 41. The pressure sensor 43 was connected by forming a measurement hole, and the output of the pressure sensor 43 was measured with an oscilloscope 44. The oscilloscope 44 is a digital oscilloscope DL-1640 manufactured by Yokogawa Electric Corporation and connected via a stabilized power supply PCR-1000LA (KIKUSUI). The pressure sensor 43 is an AP-C30 (manufactured by Keyence Corporation). 1 kPa / 40 mVDC) was used. At this time, the electromagnetic vibration type pump was driven at 100 V AC and at a frequency of 50 Hz (Table 2) and 60 Hz (Table 3). In the table, H (kPa) indicates the air pressure controlled by the valve 41, and Q indicates the flow rate at that time measured by mass flow.

  The reason why the pulsation can be suppressed in this way is as follows. For example, when air A having a difference in discharge pressure is sent as shown in the schematic diagram of FIG. Since the air is divided and sent into the small holes as it passes through the small holes, the flow proceeds in each small hole with its own pressure, and then merges again after passing through the small holes. This is considered to be C. On the other hand, in the case shown in FIG. 5B where there is no rectifying pipe, the air sent out by diaphragm vibration is directly applied as pressure to the air stored in the tank, so that the air in the tank acts as one elastic body. It is considered that the strong and strong pressing force applied to the communication port 32 is transmitted to the discharge pipe 33 through the air in the tank chamber 31 as it is.

  As is clear from Tables 2 and 3, not only when the discharge pressure (discharge air pressure) is 12.8 kPa, which is the normal specification, but also when the conventional measures are not taken, even when sending at a high pressure of 20 kPa (III) The pressure difference becomes much smaller and pulsation can be suppressed. As a result, even if the size of the tank 31 is as small as about 280 ml, vibration and noise due to pulsation can be suppressed.

  The actual noise in this state was measured. That is, as shown in FIG. 6, a microphone 47 is installed at a distance of 1 m from the outlet 45 of the pipe behind the valve 41 connected to the discharge pipe 33 of the electromagnetic vibration pump, and the volume detected by the microphone 47 is set. The noise level (dBA) represented by the correction value A that matches the sense of the human ear was measured by the sound level meter 48. In this measurement, when no measures are taken only with the conventional tank, the length is 40 mm (other dimensions are the same as the 20 mm length described above) in the honeycomb tube shown in FIG. This is measured in the case of using the rectifying tube 1 of (structure) and is shown in comparison with FIG. In addition, NL-32 manufactured by Rion Co., Ltd. was used as a sound level meter, and in this case as well, by adjusting the valve 41, measurement was performed for each case where the air pressure during normal use was 12.8 kPa and when the valve was open.

  As is clear from FIG. 7, the noise level is reduced when the measures of the present invention are clearly performed at the time of opening, at 12.8 kPa, and at 50 Hz and 60 Hz.

  Further, the pressure fluctuation (Δp) due to the length of the rectifying tube 1 was examined. In this case, the honeycomb tube used in Tables 2 to 3 was used as it was, and only the length was 10 mm, 20 mm, and 40 mm. The data in the case of L = 20 mm is the same as in Tables 2 and 3, but Table 4 (50 Hz) and L = 10 mm, L = 20 mm, and L = 40 mm are compared with each other. It shows in Table 5 (60 Hz).

  As is apparent from Tables 4 and 5, the pressure difference due to pulsation decreases as the length increases, but the flow rate Q decreases accordingly. From these tables, FIG. 8A shows the relationship when the length of L is changed for the pressure difference Δp (mV) when the normal pressure of the discharged air is 12.8 kPa. As is clear from FIG. 8A, the longer the length L of the rectifying tube, the greater the rectifying action, but as apparent from Tables 4 and 5, the flow rate Q decreases. This is because if the rectifying tube 1 becomes too long, the resistance of the air flow increases and the loss increases. However, if this loss increases, power loss occurs. Therefore, it is not preferable that it becomes larger than about 10% of the case where the rectifying pipe is not attached (Tables 2 to 3). FIG. 8B shows the rate (%) of the decrease in air volume when L = 10 mm, 20 mm, and 40 mm with respect to the flow rate Q in Tables 2 and 3 when the normal pressure is 12.8 kPa. If this air volume drop is limited to about 10%, it is necessary to make L = 30 mm or less after all.

  As a result, it was found that 10 ≦ L / D ≦ 30 was preferable. That is, the pulsation can be suppressed as the length of the rectifying tube is made longer than that in FIG. However, if the length L of the rectifying tube 1 is too long, there is a problem that the resistance increases and a flow loss occurs. Therefore, 30 mm or less is preferable from FIG.

  In each of the above examples, the pump and the tank are integrated with each other. However, as described above, the tank can be externally attached. For example, an external tank may be directly connected to the discharge port 32 shown in FIG. By incorporating the rectifying pipe of the present invention in such an external tank as well, the tank capacity can be reduced without causing noise and vibration due to pulsation. Also, even when a tank is built in the pump, the tank may be made very small (for example, about 100 ml) and an external tank may be provided in the same manner. By providing the rectifying pipe, noise and vibration due to pulsation can be suppressed while reducing the size of the external tank. As a material for the external tank, plastic or metal is used.

DESCRIPTION OF SYMBOLS 1 Rectification pipe 2 Pump 3 Tank 21 Electromagnet 21a E type iron core 21b Exciting coil 22 Vibrator 22a Permanent magnet 22b Mandrel 24 Diaphragm 25 Pump chamber 26 Intake chamber 27 Discharge chamber 31 Tank chamber 33 Discharge tube

Claims (3)

An electromagnet and a pump that sends out air by vibrating the vibrator by changing the polarity of the electromagnet with an AC power source facing the vibrator fixed with a permanent magnet;
A tank for temporarily storing the air sent from the pump;
An electromagnetic vibration type pump provided on one wall surface of the tank and having a discharge pipe for discharging air,
A rectifying pipe is provided in the tank so as to be directly connected to the discharge pipe, and the rectifying pipe is provided with a plurality of small holes arranged in parallel so as to pass through the discharge pipe. Type pump. The electromagnetic vibration according to claim 1, wherein the small hole provided in the rectifying pipe is formed so as to satisfy 10 ≦ L / D ≦ 30 in relation to a diameter D of the small hole and a length L of the small hole. Type pump. The tank comprises an external tank connected to the pump via a hose, or a small tank formed integrally with the pump and an external tank connected to the small tank by a hose. The electromagnetic vibration type pump according to claim 1, wherein the rectifying pipe is provided on the electromagnetic vibration pump.

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