JP2003056466A - Electromagnetic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic pump reducing operation sound, damping exhaust sound and reducing the number of part items and assembling man-hours. SOLUTION: Head cover parts 30, 31 of this electromagnetic pump 1 are composed of a head cover 30a and a head cap 30b, and a head cover 31a and a head cap 31b respectively. The head caps 30b, 31b are both formed of metal (such as Al die-cast). The head cover 30a and head cap 30b, and the head cover 31a and head cap 31b are respectively joint-fastened by four screws. Further, a rib and a boss for damping exhaust sound are provided in a chamber tank 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump,
In particular, the present invention relates to an electromagnetic pump that reduces noise and reduces the number of assembly steps.

[0002]

2. Description of the Related Art An example of a conventional electromagnetic pump is disclosed in Japanese Patent Laid-Open No. 2001-132647. This conventional device will be briefly described with reference to FIG. FIG. 4 is a plan sectional view of the electromagnetic pump.

The electromagnetic pump 50 has a housing 51 in which four side surfaces and a bottom surface are integrally molded of synthetic resin or the like.
have. Diaphragm inner walls 52a and 52b extending inward in a trumpet shape are formed on the left and right side surfaces of the housing 51. A rectangular hole, for example, through which the vibrator 63 passes is formed in the central bottom portion of the diaphragm inner walls 52a and 52b. The head cover portion 7 is provided on both left and right sides of the housing 51.
0 and 71 are fixed using screws, hooks and the like.

In the housing 51, an E-shaped core 57 and an E-shaped back core 58 are housed with a predetermined interval, and a central winding core portion of the E-shaped core and both sides thereof are opposed to each other. . The coil 59 is wound around the central winding core of the E-shaped core 57, but the coil is not wound around the back core 58.

A vibrator 63 having a rectangular cross section is arranged between the E-shaped core 57 and the E-shaped back core 58, and two permanent magnets 61 and 62 are fixed and a window is formed therebetween. Has been done. A pair of two first and second center plates 64a, 64b; 65a, 6 are provided at both ends of the vibrator 63.
5b is fixed, and the diaphragm 66a is sandwiched between the first and second center plates 64a and 64b, and the diaphragm 66b is sandwiched between the first and second center plates 65a and 65b. Diaphragm 66a, 66
Reference numeral b denotes a disk shape, and its outer periphery, that is, a rim portion is sandwiched between the outer peripheral annular portions of the diaphragm inner walls 52a and 52b and the head cover portions 70 and 71.

The diaphragm 6 is provided at both ends of the vibrator 63.
6a and head cover portion 70, compression chambers 72a and 72 surrounded by diaphragm 66b and head cover portion 71.
b is formed. Air is compressed on the wall surfaces of the compression chambers 72a and 72b, that is, the head covers 70b and 71b.
2a, 72b a set of two suction ports 73a for taking in,
73b is provided, and valves 74a and 74b that are bent toward the compression chambers 72a and 72b and open the suction ports 73a and 73b are provided at the suction ports 73a and 73b. Also, the compression chamber 7
Wall surfaces of 2a and 72b, that is, head covers 70b and 71
b is provided with a set of two discharge ports 75a, 75b for discharging compressed air from the compression chamber, and the valve 76 bends to the outside of the compression chambers 72a, 72b to open the discharge port.
a and 76b are provided.

Two fluid suction ports (not shown) for taking in a fluid (for example, air) are formed at the bottom of the housing 51, and the fluid sucked from the fluid suction port is It is guided to the suction ports 73a, 73b through the guides 60a, 60b formed integrally with the housing 51 and the suction chamber. On the other hand, the fluid discharged from the discharge ports 75a and 75b passes through the discharge nipples 77a and 77b provided on the head cover portions 70 and 71, the gaskets 78a and 78b inserted into the discharge nipples 77a and 77b, and the chamber tank 90. Be led to. The chamber tank 90 smoothes the pulsation of the compressed fluid that has entered from the discharge nipples 77 a and 77 b and discharges it from the discharge port 91.

A power supply lead wire 100 is attached to the coil 59.
An alternating current is supplied from an alternating current power source (not shown). The power lead wire 100 is a lead wire protection tube 101.
Is introduced into the pump 50 and connected to the coil 59 in the pump 50.

The operation of the pump is started when a commercial frequency current is supplied to the coil 59 through the power supply lead wire 100, and by the supply of this current, the vibration is generated at the opposing portions on both sides of the E-shaped core 57 and the back core 58. Magnetic poles of a polarity that attracts and repels the permanent magnets 61 and 62 fixed to the child 63 are alternately generated, and the vibrator 63 vibrates left and right at the commercial frequency. In response to this vibration, the diaphragms 66a, 6a
6b compresses the fluid in the compression chambers 72a and 72b, and the compressed fluid is discharged into the discharge ports 75a and 75b and the discharge nipple 77.
It is discharged to the chamber tank 90 via a and 77b.

In the conventional electromagnetic pump, the head cover portions 70 and 71 include head caps 70a and 71a made of rubber or resin, and head cover 70b made of resin.
71b and head caps 70a, 71a
Were fixed to the head covers 70b and 71b, respectively, by ultrasonic welding or adhesion using an adhesive.
Further, the head caps 70a and 71a are fixed to the head covers 70b and 71b with four screws, and the head covers 70b and 71b are fixed to the housing 51 with four screws. That is, the head cover portions 70 and 71 were fixed to the housing 51 with eight screws, respectively.

[0011]

The above-described conventional electromagnetic pump has a problem that noise of about 42 to 43 dB is generated during operation. To fix the head cover portions 70 and 71 to the housing 51, 16 screws are used. Therefore, there is a problem that the number of parts is large and the number of assembling steps is large.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to reduce operating noise.
An object is to provide an electromagnetic pump that attenuates exhaust noise.
Another object is to provide an electromagnetic pump in which the number of parts and the number of assembling steps are reduced.

[0013]

In order to achieve the above-mentioned object, the present invention provides an electromagnetic system including a head cover portion that forms a fluid compression chamber and a passage that guides the compressed fluid into a chamber tank. The first feature of the pump is that the head cover portion is composed of a head cap made of metal and a head cover made of resin.

The present invention has a second feature in that the first feature is provided with a rib or / and a boss protruding inward of the chamber tank.

According to the first and second characteristics, the noise of the electromagnetic pump and / or the exhaust noise leaking to the outside can be greatly reduced.

Further, the present invention has a third feature in that the head cap and the head cover are fastened together to the housing with screws. According to this feature, it is possible to reduce the number of screws to be used by half and contribute to a reduction in the number of assembly steps of the electromagnetic pump.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1A is a plan sectional view of an electromagnetic diaphragm pump (hereinafter referred to as an electromagnetic pump) according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along the line AA of FIG. ,
FIG. 2 is a left side view of FIGS. 1 (a) and 1 (b).

The electromagnetic pump 1 has a housing 10 in which four peripheral side surfaces and a bottom surface are integrally molded of synthetic resin or the like. In this housing 10, an E-shaped core 11 and an E-shaped back core 12 are arranged at a predetermined interval, and a central winding core portion of the E-shaped core and both sides thereof are arranged to face each of the back cores 12. It is stored in. The coil 13 is wound around the central winding core of the E-shaped core 11, but the coil is not wound around the back core 12.

Between the E-shaped core 11 and the E-shaped back core 12, two permanent magnets 14 and 15 are fixed, and a window 16 is formed between them. A vibrator 17 having a rectangular cross section, for example. Are arranged. A pair of first and second center plates 18a, 18b;
9a and 19b are fixed, a diaphragm 20 is sandwiched between the first and second center plates 18a and 18b, and a diaphragm 21 is sandwiched between the first and second center plates 19a and 19b.

The diaphragms 20 and 21 are disc-shaped, and the outer circumferences thereof, that is, the rim portions, are annular portions 22 and 23 formed on the left and right sides of the housing 10, and the annular portions 22 and 23.
It is sandwiched by head cover portions 30 and 31 which are arranged on the outer sides of the head cover portion 23 so as to oppose thereto. The outer appearance of the head cover portion 30 has a shape as shown in FIG.

The diaphragm 2 is provided at both ends of the vibrator 17.
0, 21 and the head cover 3 of the head cover parts 30, 31
The compression chambers 32 and 33 surrounded by 0a and 31a are formed. On the wall surfaces of the compression chambers 32 and 33, a pair of suction ports 34 for taking air into the compression chambers 32 and 33,
35 are provided, and the suction chambers 34, 35 are provided with compression chambers 32,
A valve that bends to the side of 33 and opens the suction ports 34 and 35 is provided. Further, on the wall surfaces of the compression chambers 32, 33, a set of two discharge ports 36, 3 for discharging compressed air from the compression chambers.
7 is provided, and the discharge ports 36, 37 are provided with compression chambers 32, 3
A valve that bends to the outside of 3 to open the discharge port is provided.

The housing 1 contains a fluid (eg, air).
A fluid suction port 38 for taking in is formed, and the fluid sucked from the fluid suction port 38 passes through guides 39 and 40 integrally formed with the housing 1 and a suction chamber, and the suction port 34. , 35. On the other hand, the fluid discharged from the discharge ports 36 and 37 is the head cover 3
It is guided to the chamber tank 42 via the discharge nipples 41 provided at 0 and 31. The chamber tank 42 smoothes the pulsation of the compressed fluid coming from the discharge nipple 41,
Discharge from the discharge port 43. The discharge nipple provided on the head cover portion 30 is not shown.

The coil 13 has a power supply lead wire 100.
An alternating current is supplied from an alternating current power source (not shown). The power supply lead wire 100 is introduced into the housing 1 through the power supply bush 101, and the coil 1 is installed in the electromagnetic pump 1.
Connected with 3.

The operation of the pump is started when a commercial frequency current is supplied to the coil 13 through the power supply lead wire 100, and the supply of this current causes the vibrators to be provided on the opposite sides of the E-shaped core 11 and the back core 12. Magnetic poles of a polarity that attracts and repels the permanent magnets 14 and 15 fixed to 17 are alternately generated, and the vibrator 17 vibrates left and right at the commercial frequency. In response to this vibration, the diaphragms 20 and 21 compress the fluid in the compression chambers 32 and 33, and the compressed fluid is discharged to the chamber tank 42 via the discharge ports 36 and 37 and the discharge nipple 41.

The head cover portions 30 and 31 are respectively made of resin such as PBT (polybutylene terephthalate), and head caps 30b and 3 made of metal such as Al die cast.
1b, and as is clear from FIGS. 1 (a) and 2, the head cover 30a and the head cap 30b have four parts.
The screws are jointly fastened to the housing 10 with screws 44a to 44d. The head cover 31a and the head cap 31b are also fastened together with the housing 10 by four screws. That is, the head cover and the head cap have a sandwich structure. In addition, the head covers 30a and 31 formed of the resin
The thickness of the head caps 30b and 31b made of a and metal is preferably 2 mm or more.

As described above, in this embodiment, since the head caps 30b and 31b are made of the metal having the above-mentioned thickness, the noise during the operation of the electromagnetic pump can be reduced to 39 to 40 dB. The reason for this is that the metal head cap does not vibrate due to the operating noise (air vibration) inside the electromagnetic pump, unlike the resin head cap, and it also reflects the operating noise, so the operating noise is emitted to the outside. It is considered that the propagation of vibration can be suppressed.

Since the head cover and the head cap are fastened together to be fixed to the housing 10,
The number of screws for fixing the head cover portions 30 and 31 to the housing 10 can be reduced to four each. Also, the number of man-hours was reduced.

Although not shown in the figure, the chamber tank 42 of the electromagnetic pump 1 has a plurality of rod-shaped ribs extending inward from the bottom or ceiling of the chamber tank 42 and plates arranged alternately. -Shaped ribs are provided, and a hollow boss extending inside the chamber tank 42 is formed in the discharge port 43 continuously with the discharge port 43.

When the head caps 30b and 31b are made of metal, the ribs are provided in the chamber tank 42, and the boss is provided at the discharge port 43, exhaust noise from the discharge port 43 is generated. It has been found that the noise of the electromagnetic pump can be further reduced since it can be attenuated. It should be noted that, if the length of the hollow boss is increased, the effect of damping exhaust noise is further increased.

FIG. 3 shows the noise value A when the conventional electromagnetic pump operates, the noise value B when the head caps 30b and 31b according to the present invention are made of metal (Al), and the head cap 3
0b and 31b are made of metal (Al) and the chamber tank 4
2 is a diagram showing a measured value with a noise value C when a rib is provided in 2 and a boss is provided at the discharge port 43. FIG. The head covers 30a and 31a, the head caps 30b and 31b
Both had a thickness of about 3 mm.

As is apparent from FIG. 3, the noise (operating noise) value A of the conventional electromagnetic pump is 42 to 43 dB, whereas the head caps 30b and 31b of this embodiment are made of metal. The noise value B was reduced to 39 to 40 dB, and the noise value C obtained by adding ribs and bosses in the chamber tank 42 was reduced to 36 to 37 dB.

[0032]

As is apparent from the above description, according to the present invention, since the head cap is made of metal, the noise (operating noise) generated when the electromagnetic pump operates.
Can be greatly reduced, and a quiet electromagnetic pump can be provided.

Further, in addition to forming the head cap from metal, ribs and / or bosses protruding inward are provided in the chamber tank, so that exhaust noise can be attenuated. The noise generated during the operation of the electromagnetic pump can be further reduced, and a quieter electromagnetic pump can be provided.

The head cap and head cover are
By tightening the screws together with the housing, the number of screw parts can be reduced and the number of assembly steps of the electromagnetic pump can be reduced.

[Brief description of drawings]

1 is a plan sectional view of an embodiment of the present invention, and FIG.
FIG.

FIG. 2 is a left side view of FIG.

FIG. 3 is a diagram comparing noise values of a conventional device and a device of the present invention.

FIG. 4 is a plan sectional view of a conventional device.

[Explanation of symbols]

1 ... Electromagnetic pump, 10 ... Housing, 30, 31 ...
Head cover part, 30a, 31a ... Head cover, 3
0b, 31b ... Head cap, 32, 33 ... Compression chamber, 34, 35 ... Suction port, 36, 37 ... Discharge port, 42
... Chamber tank, 43 ... Discharge port, 44a to 44d ...
·screw.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H003 AA02 AC02 AD01 AD02 BA00                       CD01 CD02                 3H076 AA03 AA13 BB01 BB40 BB41                       CC03 CC35                 3H077 AA12 CC02 CC09 CC17 DD05                       DD17 EE24 EE35 EE37 FF02                       FF32

Claims (5)

[Claims] 1. An electromagnetic pump comprising a head cover part forming a fluid compression chamber and a passage for guiding the compressed fluid into a chamber tank, wherein the head cover part comprises a head cap made of metal. An electromagnetic pump comprising a head cover made of resin. 2. The electromagnetic pump according to claim 1, wherein the head cap is formed by aluminum die casting. 3. The electromagnetic pump according to claim 1, wherein the head cap and the head cover are fastened to the housing together with screws. 4. The electromagnetic pump according to claim 1, wherein a rib protruding inward of the chamber tank is provided in the chamber tank. 5. The electromagnetic pump according to claim 1, wherein the discharge port of the chamber tank is provided with a hollow boss projecting inward of the chamber tank.