JP2001329955A - Air pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive air pump device capable of further reducing noise. SOLUTION: This device is provided with: an intermediate plate for fixing an air pump body through a fixing elastic body so as to mount it; a lower casing having an air passage for receiving the discharged air from the air pump body and an exhaust pipe for exhausting the discharged air; an upper casing fixed coincidentally with the lower casing and formed so as to cover the air pump body; and a box-like sound isolation case fixed to the intermediate plate so as to cover the air pump body inside the upper casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an air pump device.

[0002]

2. Description of the Related Art An air pump for supplying air to a sewage treatment tank includes:
There are a diaphragm air pump, an electromagnetic air pump, a rotary air pump, and the like. The diaphragm type air pump includes a vibrator connected to the diaphragm and having a permanent magnet, and an electromagnetic coil provided on an outer peripheral portion of the vibrator, and the electromagnetic coil is driven by an AC power supply to vibrate by magnetic interaction. Reciprocates the vibrator to reciprocate the diaphragm connected to the vibrator to suck air,
This is a configuration for discharging.

An air pump having a structure of sucking and discharging air by such a reciprocating motion has a high vibration and noise level, and the air pump is fixed by a rubber component having a vibration proof structure as a measure for preventing vibration. As a noise reduction measure, the air pump section is completely surrounded by a soundproof wall with high transmission loss to prevent sound transmission to the outside. A commonly used soundproof wall with high transmission loss is an aluminum diecast soundproof wall, which also serves as the casing of an air pump.

[0004]

The soundproof wall provided to prevent the transmission of noise from the air pump section as described above is as follows.
Although the effect of preventing noise from transmitting to the outside is high, most of them are made of aluminum die-casting, and thus are expensive. Also, if measures must be taken to increase the sound insulation effect of the sound barrier and further reduce the noise value leaking to the outside, a method of increasing the mass of the sound barrier to increase transmission loss can be considered. For example, with the same material, even if the wall thickness is doubled, the transmission loss increases only by 5 to 6 dB. In addition, the increase in the thickness causes the coincidence frequency to be in a low frequency range. It is difficult to expect noise reduction.

An object of the present invention is to provide an air pump device which is inexpensive and can further reduce the noise value.

[0006]

SUMMARY OF THE INVENTION The present invention provides an air pump body for discharging air, an intermediate plate fixed via a fixing elastic body so as to mount the air pump body, and air for receiving air discharged from the air pump body. In an air pump device including a lower casing having a passage and a discharge pipe for discharging discharge air, and an upper casing fixed to the lower casing and formed so as to cover the air pump body, a lower side is opened and an upper side is closed. The sound insulation case in the form of a box is fixed to the middle plate or the lower casing so as to cover the air pump main body inside the upper casing.

[0007]

1 to 3 show an air pump device according to an embodiment of the present invention. FIG. 1 is a longitudinal side view, FIG. 2 is a plan view, and FIG. 3 is a plan view of a lower casing. FIG.

A partition 2 is provided inside the box-shaped upper casing 1 to partition the inside of the upper casing 1 into two chambers. An air inlet 3 is provided in the upper part of the upper casing 1, and air is introduced into the upper casing 1 through an air filter 4 provided in an upper chamber partitioned by a partition 2 above the upper casing 1. Further, a control board 5 is provided in the upper chamber of the upper casing 1 together with the air filter 4. The partition 2 of the upper casing 1 is provided with an air inlet 6 as an air passage from the air inlet 3 on the upper part of the upper casing 1, and the intake air accompanying the operation of the air pump body 7 is supplied to the upper part of the upper casing 1. The air is introduced from the air inlet 3 through the air inlet 6 into the lower chamber partitioned by the partition 2 into the upper casing 1.

The air pump body 7 is elastically fixed to the middle plate 9 by a fixing elastic body 8 which is a vibration isolating rubber for elastically supporting the air pump body 7, and the surroundings thereof are sound-insulating cases 19.
Besieged by. The middle plate 9 is provided between the upper casing 1 and the lower casing 10 and has a structure for making the inside of the lower casing 10 a closed chamber, and a sheet packing 11 for sealing is provided with the lower casing 10 and the middle plate. 9 so as to be sandwiched between them.

Connecting pipe 12 connected to air pump body 7
The air pump 13 supplies compressed air from the air pump body 7 to the air passage 13 in the lower casing 10 through the connecting pipe 12 during operation. A switching valve 14 is provided in the lower casing 10 and connected to the air passage 13.

The switching valve 14 controls the mechanical or electrical mechanism by the control board 5 so that the compressed air introduced through the air passage 13 is supplied to one of the pipes 15 and 16 at a certain time interval. To the lower casing 10
Is discharged from one of the discharge pipes 17 and 18 provided on the side surface of. The discharge pipes 15 and 16 are connected to a sewage treatment tank (not shown) to supply air to the sewage treatment tank.

FIGS. 4A and 4B show the structure of the sound insulation case 19, wherein FIG. 4A is a plan view and FIG. 4B is a side view.

The sound insulation case 19 in this embodiment
Is made of sheet metal and has a box-like structure with an open lower side, an air inlet 20 for taking in air at the upper part, and an air passage to the air pump body 7 is secured. Further, since the sound insulation case 19 is assumed to have a high internal sound pressure level, it has a polyhedral shape as a means for reducing vibration and reverberation sound.

As described above, this sound insulation case 19
The air pump body 7 is covered so as to cover it, and is fixed to the middle plate 9. At this time, the vibration isolating packing 21 is interposed between the middle plate 9 and the sound insulating case 19 to block the transmission of vibration between the sound insulating case 19 and the middle plate 9. By adopting this structure, the air pump main body 7 in this embodiment is configured to be covered with a double sound insulating wall formed by the sound insulating case 19 and the upper casing 1, and a completely independent sound insulating wall is doubled. Therefore, the sound that is interrupted by one wall (the sound insulating case 19) is further interrupted by the next wall (the upper casing 1). According to such a sound insulation configuration, since the transmission loss becomes the sum of the respective sound insulation walls, it is possible to provide an air pump device that can greatly reduce the sound.

By the way, in this embodiment, the sound insulation case 19 is made of sheet metal, but may be made of a cheaper resin material or a material that is more expensive but different from an aluminum die-cast product. And this sound insulation case 1
9 may be fixed to the lower casing 10 in the same manner. Furthermore, although the switching valve 14 for two-way switching is installed in the lower casing 10, the exhaust pipe has only one direction and the switching valve 14 is not necessary, or the switching valve 14 for three-way switching or more is installed to discharge the exhaust pipe. Similarly, three or more tubes may be provided.

According to the sewage treatment tank supplied by using such an air pump device, quiet sewage treatment can be realized.

[0017]

According to the present invention, the transmission loss of noise from the air pump body can be increased by providing an upper casing which is a sound insulating wall and additionally providing a sound insulating case in the upper casing. It is possible to reduce the noise level. Further, by using a double sound insulation wall, even if one or both materials are inexpensive, it is also possible to secure a noise level equivalent to the conventional one by reducing the noise level by the double sound insulation wall structure.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an air pump device showing one embodiment of the present invention.

FIG. 2 is a plan view of the air pump device shown in FIG.

FIG. 3 is a plan view of a lower casing in the air pump device shown in FIG.

FIG. 4 is a plan view (a) and a side view (b) of a sound insulation case in the air pump device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper casing, 2 ... Partition wall, 3 ... Air intake, 4:
Air filter, 5 ... control board, 6 ... air inlet, 7 ...
Air pump body, 8: elastic body for fixing, 9: middle plate, 10 ...
Lower casing, 11: sheet packing, 12: connecting pipe,
13 ... air passage, 14 ... switching valve, 15, 16 ... conduit, 17, 18 ... discharge pipe, 19 ... sound insulation case, 20 ... air inlet, 21 ... anti-vibration packing.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeo Watanabe 1250 Shimoe-ren, Shimodate-shi, Ibaraki Pref.

Claims (1)

[Claims] An air pump body for discharging air, an intermediate plate fixed via an elastic body for fixing the air pump body on the air pump body, an air passage for receiving air discharged from the air pump body, and a discharge for discharging the discharged air. An air pump device including a lower casing having a pipe and an upper casing fixed to the lower casing and formed so as to cover the air pump body, wherein a box-shaped sound insulating case having an open lower side and a closed upper side. The air pump device is fixed to the middle plate or the lower casing so as to cover the air pump main body inside the upper casing.