JPH04358713A - Air supplying device - Google Patents

Abstract

PURPOSE:To manufacture a noise reduction tank easily and form the tank in a compact size. CONSTITUTION:An air supplying device is provided with the air pump 1 of a reciprocating motion type which has a discharging port 1a for discharging compressed air, and an bag 2 having a leading port 2a for leading the compressed air. Also, the device is provided with a noise reduction tank 3 formed in a prescribed inner volume, wherein a leading port 3a is provided for leading the compressed air, and a flow passage 4 connected to the air bag 2 branching in nearly right direction from the leading port 3a of the noise reduction tank 3, wherein the air pump 1 is connected to the noise reduction tank 3. Since the noise reduction tank 3 having one inlet/outlet of air is used for suppressing pulsation noise of the compressed air supplied intermittently from the air pump 1 of the reciprocating motion type into the air bag 2, it is possible to manufacture the noise reduction tank 3 easily, and also economize space for piping to the noise reduction tank 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply device having a muffling tank that suppresses pulsation of compressed air supplied from a reciprocating air pump.

0002

2. Description of the Related Art As shown in FIGS. 7 to 9, a conventional air supply device includes a reciprocating air pump 1, an air bag 2 such as a mat for preventing bedsores, and a sound deadening tank 8 interposed between the two. ,have. The air pump 1 has a discharge port 1a
It consists of an electromagnetic diaphragm pump, etc., which has a diaphragm pump and discharges compressed air intermittently from a discharge port 1a. The air bag 2 is a sealed bag having an inlet 2a and a small exhaust hole, and holds the compressed air supplied from the air pump 1. The muffling tank 8 is shaped like a container and has a predetermined volume, and has an inlet 8a connected to the discharge port 1a and an outlet 8b connected to the inlet 2a of the air bag 2. This muffling tank 8 is obtained by blow molding polypropylene, polyethylene, or the like, and has a volume that is sized to suppress pulsating noise caused by intermittent supply of compressed air to a predetermined level. For example, a mat used for preventing bedsores has a size of about 150 to 200 cc. In addition, the inlet 8a and the outlet 8b are on the same surface (
They are provided on opposing surfaces (in directions in which air flows are mutually opposite directions) or on opposing surfaces (in directions in which air flows are in mutually sequential directions).

0003

SUMMARY OF THE INVENTION In the air supply device as described above, the inlet and the outlet protrude from the silencing tank, making it complicated to manufacture the silencing tank. In addition, the piping to the sound deadening tank takes up space.

The present invention was made in view of the above-mentioned circumstances, and its object is to provide an air supply device in which a muffling tank can be easily manufactured and miniaturized.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the air supply device of the present invention includes a reciprocating air pump having a discharge port for discharging compressed air, and an inlet for introducing the compressed air. a sound deadening tank having a predetermined internal volume and having an inlet for introducing compressed air; and a sound deadening tank that connects the air pump and the sound deadening tank and branches in a substantially right angle direction from the inlet of the sound deadening tank, and the air bag and The structure includes a connecting flow path.

[0006]

[Function] According to this configuration, the discharge port of the air pump is directly connected to the muffling tank which has only an inlet, and the air pump is branched from the inlet of the muffling tank in a substantially right angle direction and connected to the air bag, so that the reciprocating movement The pulsating sound of the compressed air that is intermittently supplied to the air bag from the air pump of the type is suppressed to the almost perpendicular component of the pulsating sound that travels straight from the air pump to the muffling tank, and the reflected component of the pulsating sound that is alleviated by the muffling tank. .

[0007]

Embodiment A first embodiment of the present invention will be described below with reference to FIG. This thing includes a reciprocating air pump 1,
Air bags such as mats to prevent bedsores 2 and sound deadening tank 3
The main parts of the present invention are the silencing tank 3 and the flow path 4. Parts other than this main part are
Since this is the same as the conventional example described above, substantially the same members are given the same reference numerals and detailed explanations will be omitted.

The muffling tank 3 consists of a box-shaped container 3b which is sealed and has a predetermined volume and has one inlet 3a. This muffling tank 3 is obtained by blow molding polypropylene, polyethylene, or the like, and its volume is sized to suppress pulsating noise caused by intermittent supply of compressed air to a predetermined level. For example, a mat used for preventing bedsores has a size of about 150 to 200 cc.

The flow path 4 is connected by press-fitting hoses into the three ports of a substantially T-shaped pipe joint, and the other ends of each hose are connected to the discharge port 1a of the air pump 1 and the silencer tank 3.
The inlet 3a of the air bag 2 is press-fitted and connected to the inlet 2a of the air bag 2, and the part that directly connects the outlet 1a of the air pump 1 and the inlet 3a of the muffling tank 3 is connected to the inlet 3a of the muffling tank 3, which is used for example as a mat for preventing bedsores. is branched in a substantially right angle direction from within 40 mm to form a portion connected to the inlet 2a of the air bag 2.

In this case, compressed air is simultaneously supplied to the air bag 2 and the muffler tank 3, but the pulsating noise caused by the intermittent supply of compressed air is caused by the muffler tank 3 being directly connected to the discharge port 1a of the air pump 1. , which branches off from near the inlet 3a of the muffling tank 3 in a substantially perpendicular direction and is connected to the air bag 2, so that it does not directly affect the air bag 2.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 to 5.
The explanation will be based on. The main part of the present invention is the muffling tank 5. Members other than this essential part are the same as those in the first embodiment described above, so substantially the same members are given the same reference numerals and detailed explanations will be omitted.

The muffling tank 5 shown in FIG. 2 has an inlet port 5a.
A hard plastic pipe portion 5b forming a tube, and two flexible sheets 5c of vinyl chloride, urethane, etc.
5c and a bag portion 5d formed by high-frequency welding the outer periphery of the bag portion 5c to a predetermined size. The tube portion 5b is attached during high frequency welding between the two sheets 5c, 5c so as to communicate with the inside of the bag portion 5d. Alternatively, as shown in FIG. 3, it is joined at a position opposite to an opening 5e formed in the sheet surface. The bag portion 5d expands to a predetermined volume when compressed air flows into the bag portion 5d. Since the bag portion 5d of the silencer tank 5 can expand and contract, it absorbs the energy of pulsating noise caused by the intermittent supply of compressed air as the vibrational energy of the expansion and contraction of the bag portion 5d, thereby alleviating the pulsating noise. As a result, the predetermined volume can be reduced to less than half that of the blow-molded one shown in the first embodiment, provided that the effect of alleviating pulsating noise is the same. In addition, two sheets 5c, 5c
Since it is formed by joining together, it is possible to manufacture a thin tank, which is difficult to do with blow molding.

The muffler tank 5 shown in FIGS. 4 and 5 is a modification of the muffler tank 5 shown in FIGS. 2 and 3, and has a bag portion 5d.
Tongue pieces 5f, 5f, 5f, 5f extending from the four corners of
have. The tongue portion 5f is made by punching out one or both of the two flexible sheets 5c, 5c forming the bag portion 5d, and has an engaging portion 5g at each end for incorporation into the device. have. This muffling tank 5 is suspended and installed in a predetermined space of the device via the tongue portion 5f. As a result, the vibrations generated in the muffling tank 5 due to the intermittent inflow of compressed air are absorbed by the tongue portion 5f, so that the influence on vibrations and noise of the device can be suppressed.

Next, a third embodiment of the present invention will be explained based on FIG. 6. The main parts of the present invention are the muffling tank 6 and the flow path 7.
It is in. Members other than this essential part are the same as those in the first embodiment described above, so substantially the same members are given the same reference numerals and detailed explanations will be omitted.

The sound deadening tank 6 and the flow path 7 are formed by high-frequency welding the outer periphery of two flexible sheets 6a, 6a of vinyl chloride, urethane, etc. into a predetermined shape and size. 6b, and an inlet 6c communicating with the flow path 7.

The flow path 7 is formed together with the muffling tank 6 and is connected to a second bag portion 7b having a hard plastic pipe portion 7a connected to the discharge port 1a of the air pump 1, and an inlet port 2a of the air bag 2. A third bag portion 7c having a tube portion 7a made of hard plastic and perpendicular to the second bag portion 7b.
It consists of and.

[0017] This thing includes a sound deadening tank 6 and a flow path 7.
is integrally formed between two sheets 6a, 6a. As a result, the number of parts can be reduced, and the space including the silencing tank 6 and the flow path 7 can be kept small.

The second and third embodiments described above have an excellent effect of alleviating pulsating noise, so that together with the muffling tank, the device can be downsized.

Note that the opening area or diameter of each of the inlet 2a of the air bag 2 and the inlet 3a of the silencing tank 3 is as follows:
The inlet port 3a side of the muffling tank 3 may be made larger to further suppress the pulsating noise generated in the air bag 2. These opening areas or diameters vary depending on the flow rate of compressed air flowing through the flow path 4, but for example, when the flow rate is 1600
If it is about 0cc/min, the inlet port 2 of the air bag 2
It is preferable that the diameter of a is 4.5 mm, and the diameter of the inlet 3a of the muffling tank 3 is 5 mm or more. Inlet port 2a of this air bag 2
The smaller is, the more the pulsating noise generated in the air bag 2 is suppressed, but it is set to such an extent that the pressure loss of the compressed air supplied to the air bag 2 does not exceed the allowable limit. Furthermore, the larger the inlet port 3a of the muffling tank 3 is, the more the pulsating noise is alleviated. In addition, a flexible sheet 5c is attached to the sound deadening tank 5 in the second embodiment.
Although it is shown that it is used almost entirely, the same effect can be obtained even if it is used partially.

[0020]

[Effects of the Invention] The air supply device of the present invention, with the above-described configuration, has a single air inlet and outlet in order to suppress the pulsating noise of the compressed air that is intermittently supplied to the air bag from the reciprocating air pump. Since the muffler tank is used, the muffler tank can be easily manufactured, and the space for piping to the muffler tank can be saved, so that the device can be made smaller.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the present invention, in which (a) is a configuration diagram of an apparatus, and (b) is an enlarged view of main parts.

FIG. 2 shows a silencer tank according to a second embodiment of the present invention, in which (a) is a plan view and (b) is a cross-sectional view.

FIG. 3 similarly shows a modified example, in which (a) is a plan view and (b) is a sectional view.

4A and 4B also show a modification, in which (a) is a plan view, (b) is a perspective view, and (c) is a side view when installed.

[Fig. 5] Similarly, a modified example is shown, (a) is a plan view, (b) is a sectional view, (c) is a perspective view when installed, (
d) is a front view when installed.

FIG. 6 is a plan view showing a muffling tank according to a third embodiment of the present invention.

FIG. 7 shows a conventional example, in which (a) is a configuration diagram of the device;
(b) is a layout diagram of an air pump and a muffling tank.

FIG. 8 is a cross-sectional view showing a sound deadening tank.

FIG. 9 is a cross-sectional view showing the muffling tank.

[Explanation of symbols]

1 Air pump 1a Discharge port 2 Air bag 2a Inlet 3. Sound deadening tank 3a　Introduction port 4 Distribution path 5. Sound deadening tank 5a　Introduction port 6. Sound deadening tank 6c Inlet 7 Distribution path

Claims (1)

[Claims] Claim 1: A reciprocating air pump having a discharge port for discharging compressed air, an air bag having an inlet for introducing the compressed air, and an air bag having an inlet for introducing the compressed air and formed to have a predetermined internal volume. An air supply device comprising: a muffling tank; and a flow path that connects the air pump and the muffler tank, branches in a substantially right angle direction from an inlet of the muffler tank, and connects to an air bag.