JPH07255851A - Oxygen concentrator - Google Patents

Abstract

PURPOSE:To obtain a sufficient sound eliminating effect, and downsize the whole device without lengthening a passage length by arranging sound insulating plates in inflow discharge passages of the atmosphere, or installing an underfloor sound insulating duct by using a dead space of a device under surface. CONSTITUTION:Sound insulating plates 10 and 11 which are formed by sticking a sound absorbing material to a sound insulating material and have plural through holes, are arranged in one or both of an atmosphere inflow side passage and an atmosphere discharge side passage of a pressure variation absorbable oxygen concentrator. Or an underfloor sound insulating duct 2 having sound insulating plates 13 in the passages is installed on an outside under surface of an outer shell bottom plate of a device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical oxygen concentrator, and more particularly to an improvement for reducing operating noise of a pressure fluctuation adsorption type oxygen concentrator.

[0002]

2. Description of the Related Art A medical oxygen concentrator is used near the bedside of a patient regardless of whether it is day or night. Therefore, it is strongly required that the patient and his / her family have low noise. . The pressure fluctuation adsorption type oxygen concentrator generally produces a large amount of noise. To reduce the noise, double soundproof casings are used. It is housed in a soundproof housing, for example, vibration of the electric motor and compressed air supply means, which is the source of noise and vibration, is prevented by using anti-vibration rubber and springs, and the sound wave from the sound source uses double sound insulation walls. There is known a method in which a noise is reduced by hermetically sealing the sound-insulating wall to increase the sound-insulating property, increasing the mass, and attaching a sound absorbing material to the inner wall surface to absorb sound energy.

These are methods of reducing the vibration of the housing and reducing the transmitted sound from the wall surface. However, since these sound sources include those that consume electric power and generate heat, they are used for cooling. Cooling air is required. For this reason, an air intake and a heated exhaust air outlet are indispensable for the soundproof housing, but noise is emitted from the intake and the outlet,
Preventing this is also very important.

When the sound emitted from the air inlet and the air outlet becomes louder than the sound transmitted through the wall, it becomes more important to lower the noise level of the entire apparatus. Regarding the reduction of noise in the air flow passage, Japanese Patent Publication No. 2-29601 discloses a method shown in FIGS. 7B and 7C, and Japanese Patent Publication No. 3-3.
No. 24 publication, the method shown in FIG.
No. 4007 discloses a similar method, that is, by giving a large number of bendings to the atmosphere inflow passage and the atmosphere outflow passage, lengthening the passage, and providing a sound absorbing material on the inner surface of the bend, noise is reduced. A method of reducing is shown.

On the other hand, it goes without saying that the smaller and lighter the device, the easier it is for the patient, hospital, or people who carry or install the device. However, as described in Japanese Patent Publication No. 29601/1990, the length of the air inflow passage and the air outflow passage are increased by the above-described method of increasing the number of bends in the air passage and increasing the passage length. It is necessary to make each of the lengths equal to or more than the minimum value of the length between the opposite ends on the surface forming the outer shell of the device, and the passage volume for the constituent equipment accommodating portion of the device becomes large. As constituent equipment of the oxygen concentrator, in addition to equipment that needs to be placed in a soundproof box inside the double box, there is no sound or quiet equipment or parts with small sound (hereinafter,
There is also a need for a place to store this inside the housing, the size of the device becomes large, the weight of the device also becomes large, and there is a possibility that it will be far from the previous request for small size and light weight. .

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to correct the above-mentioned drawbacks and to reduce the size of the device without long air intake / exhaust passages and without reducing the function of the oxygen concentrator. It is an object of the present invention to provide an oxygen concentrator that can be made small and has a noise level equal to or lower than the conventional noise level.

[0007]

Means for Solving the Problems That is, the present invention has been completed as a result of earnest research to achieve such an object, and (1) a portion of a device constituting an oxygen concentrator for accommodating a silent device. Constructing and utilizing the muffler as a muffling room, (2)
An underfloor sound insulation duct for exclusive use of exhaust is installed in the space under the outer shell of the device, and (3) a sound insulation air passage with a short sound passage and a high sound insulation effect is provided in the air passage.
By organically combining the above three points, the effect of noise reduction is enhanced.

Specifically, an adsorption column filled with an adsorbent that selectively adsorbs moisture and nitrogen gas in the atmosphere, a buffer tank for storing oxygen-enriched air discharged from the adsorption column,
A compressed air supply means comprising an electric motor for supplying compressed air to the adsorption cylinder and an air compressor driven by the electric motor, conduits connecting the compressed air supply means and the adsorption cylinder,
A motor as a noise source in a pressure fluctuation type oxygen concentrating device including automatic valves provided in the conduits, an electric control device for controlling the operation of the automatic valves and compressed air supply means, and wirings thereof. , Noise compressors such as air compressors, automatic valves, etc. are housed in a soundproof box with soundproof walls, and noiseless suction cylinders, buffer tanks, conduits, electrical control devices, wiring, etc. The equipment is basically housed in a sound deadening room.

The first aspect of the present invention is characterized in that an atmosphere inflow passage between an atmosphere intake port provided in an outer shell housing made of a soundproof wall and an atmosphere inflow opening portion of the soundproof box is provided with a silence chamber for storing silent equipment. The air inflow passage, and the air outflow passage between the air outflow opening of the soundproof box and the air outflow port provided in the outer casing, either or both,
The oxygen concentrator is provided with a sound-insulating ventilation path provided with one or more sound-insulating plates.

In a second aspect of the present invention, one or a plurality of sound insulating plates are provided in the atmosphere inflow passage between the air intake provided in the outer shell casing made of a soundproof wall and the air inflow opening of the soundproof box. It is composed of an attached sound-insulating air passage and the following silent chamber for storing silent equipment, and the air outflow opening of the soundproof box is provided in close contact with the air outlet on the bottom of the outer shell housing, and the lower surface of the outer shell housing. Is an oxygen concentrating device which is connected to an underfloor sound insulation duct provided with one or more sound insulation plates and used as an air discharge passage.

According to a third aspect of the present invention, one or a plurality of sound insulating plates are provided in the atmosphere inflow passage between the air intake provided in the outer shell housing made of a soundproof wall and the air inflow opening of the soundproof box. A sound-insulating ventilation path attached, and a silent chamber for accommodating the silent device that follows it, and between the atmosphere outflow opening of the soundproof box and the atmosphere discharge port provided in the outer shell casing,
An atmosphere discharge passage provided with one or a plurality of sound insulating plates is provided, and an atmosphere discharge port of the atmosphere discharge passage is provided on the bottom surface of the outer shell casing, and one or a plurality of sound insulators are provided on the lower surface of the outer shell casing. This is an oxygen concentrating device that is connected to an underfloor sound insulation duct with a plate attached to it and forms a part of the air discharge passage.

Further, the fourth invention is based on the second and third aspects.
In the invention, the silent device storage and muffler chamber that constitutes the atmosphere inflow passage includes a silent device storage and muffler chamber that houses a silent device group of electric systems such as electric control devices and wiring, and an adsorption cylinder, a buffer tank, conduits, etc. Is an oxygen concentrating device including two silent device-accommodating and noise-reducing chambers accommodating a silent device group of the air system.

Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 to 3 are cross-sectional views showing the internal structure of an oxygen concentrator according to an embodiment of the present invention, and FIG. 4 is a diagram showing an example of the structure of a soundproof box housed in an outer shell housing of the oxygen concentrator. FIG. 5 is a view showing the structure of the sound insulation plate, and FIG. 6 is a view showing the structure of the underfloor sound insulation duct.

In order to reduce the noise of the oxygen concentrating device, among the devices constituting the device, compressed air supply means 19 including an electric motor and an air compressor, which are noise sources, automatic valves 21, etc. Is stored in a first soundproof box 16 that is housed and installed in the outer shell 1 housing having a soundproof structure to prevent noise from passing through the wall surface. Then, in order to prevent the propagation of vibration between the outer shell housing and the soundproof box, the first soundproof box is moved three-dimensionally inside the outer shell housing without making a strong connection (for example, fixing with screws). Is suppressed by, for example, a wall surface, a floor surface, a ceiling surface, or the like in close contact with the surface to suppress movement, thereby reducing sound propagation. Needless to say, devices such as an electric motor and an air compressor that are housed and mounted in the first soundproof box and that generate vibration during operation are mounted via a means for softening the vibration, such as the spring 20 and a vibration-proof rubber.

Of these, the devices housed in the first soundproof box 16 include those that generate heat, such as an electric motor and an air compressor, so that air for cooling the device is introduced and heat is exchanged. It is necessary to discharge warm air. It is necessary to prevent noise from leaking out through the inflow / outflow passage of the cooling atmosphere. Of the devices that make up the oxygen concentrator, a silent device that does not emit noise is placed in a part of the air inflow passage.Since these are a collection of various shapes and most of them are solid shapes, the scattering of sound waves Wake up. Then, a sound absorbing material is attached to the wall of the chamber that stores these to absorb the scattered sound waves, and the inlet and outlet of the passage for the cooling air are arranged at positions as far as possible from the storage chamber. When the storage room is large and wide with respect to the inlet, this silent device storage room acts as a silencer, including the effect of noise reduction due to expansion.

The quiet equipment corresponds to the suction cylinders 4 and 4 ', the buffer tank 5, the electronic control equipment 36, the piping and the like. These are to be arranged between the outer shell housing 1 and the soundproof boxes 14 and 16, but the arrangement space is positively utilized as a means for silencing. In other words, divide these into several groups to create a room for storage.
This grouping method is a grouping method that is convenient for maintaining the oxygen concentrator, or a grouping method that requires similar functions and piping and wiring, and a group that requires electronic components and electrical wiring. There are methods such as dividing. It may be divided into groups in consideration of factors such as maintainability, assemblability, and dispositionability. In any case, since these constituent devices or parts are hard solid-shaped objects, they become scattering objects of sound waves. Sound absorbing material is attached to some of the six surfaces of the storage chamber so that the scattered sound waves are absorbed and reduced by the sound absorbing material, and an inlet and outlet for the atmosphere are provided to allow the cooling air to flow in and out. By using it as part of the exhaust passage, the noise passing through this room is reduced. In addition, when entering this room from the inlet, it also has an effect of expanding and muffling, so compared to the conventional method of providing a long air inflow and exhaust passage with many bends Can be effectively utilized.

Next, when the oxygen concentrator is used in a hospital or at the patient's home, it is preferable that the volume of the device is small in the housing situation in Japan where the living space is small. The device has casters 3 on the bottom for its movement, and the space between the bottom of the device and the floor has been wasted until now. On the other hand, a filter 35 for purifying dirty air or removing suspended dust is provided at the inlet of the cooling air. Due to ergonomics, it is preferable to install the filter on the front upper part because it is easy to clean the dirt and is easy to see. Then, the discharged hot air is usually configured to be discharged to the opposite side, that is, the lower rear part in order to prevent the hot air from flowing around the inlet.

In the present invention, the space under the floor which is wasted in the past, which is formed between the bottom surface and the floor surface of the apparatus, is used to install the underfloor sound insulation duct 2 for exhaust, thereby reducing the volume of the apparatus. , It is configured to enhance the sound deadening effect while effectively utilizing the occupied space. The underfloor sound insulation duct 2
It is a part for discharging warm air after cooling mainly for the purpose of noise reduction, which effectively utilizes the space between the bottom surface of the device and the floor surface created by the casters 3 attached to the bottom surface of the device. There are structural restrictions on the size. That is, when moving the device, in order to move the device over the sill or the ginger without rubbing the bottom, at least 2 above the floor.
A space of 0 mm or more, preferably 30 to 50 mm is required.
On the other hand, the height of the oxygen concentrator is mostly in the range of 500 to 900 mm, and the weight is also in the range of 30 to 70 kg, so the height of the caster 3 used is also 50 to 120 mm.
Under these circumstances, the thickness of the underfloor sound insulation duct 2 is in the range of 30 to 90 mm, and has a plane smaller than the plane dimension of the device.

The underfloor sound insulation duct 2 in the present invention has a size that fits within this dimension, and as shown in FIG. 6, a tray-like housing made of sound insulation material, which has a structure as shown in FIG. By installing one or a plurality of sound insulation plates 13), an excellent sound deadening effect is obtained. And
A sound absorbing material is attached to the inner surface of the housing, and it may be attached and fixed to the lower surface of the bottom plate of the device as it is, but a sound absorbing material or a sound insulating material lined with sound absorbing material is attached to the upper surface of the housing as a lid, and The device may be attached directly to the lower surface of the bottom plate of the apparatus or with a space provided. When the lid is attached to the top surface, an exhaust gas inlet is provided at a position corresponding to the atmospheric air outlet 9 on the bottom surface of the device. The shape of the passage in the housing is not particularly limited, but as shown in FIG. 6 (a), an exhaust port 28 is provided at a position on the opposite side of the exhaust gas inlet port to linearize the exhaust gas passage 26. Alternatively, as shown in FIG. 6B, it is also effective to provide the exhaust passage 26 with a spiral partition by providing a spiral partition wall around the exhaust inlet.

The sound insulation plate 11 (10,
13), as shown in FIG. 5, a sound absorbing material 24 is attached to one or both sides of the sound insulating material 23, and a plurality of through holes 2
It has a structure provided with 2. Sound absorbing material 24 is sound insulating material 23
It is preferable to attach it to both sides of the sheet, but it may be attached to one side, and in that case, it is preferable to attach it to the windward side of the air flow. The number of the through holes 22 is one or more, and the shape is not limited, but it is preferably circular or quadrangular in view of manufacturing. The sound absorbing material used in the present invention is, for example, a polyurethane continuous foam material, and may be glass wool or felt. The sound absorbing material is provided with an opening of substantially the same shape as the opening of the sound insulating material 23,
It is constructed by joining the openings of the sound insulation material so that they can be ventilated. Further, the thicker the sound absorbing material, the greater the sound deadening effect, and the larger the number of sound insulating plates installed, the greater the sound deadening effect.

However, depending on the sound deadening function or the size limitation, it may not be possible to obtain a sufficient sound deadening effect, whether it is a silent room for storing silent equipment or an underfloor sound insulation duct. In order to compensate for this, sound insulation ventilation paths 25 and 27 are provided. The sound-insulating ventilation paths 25, 27 are mainly intended to muffle sound in the passages for passing the cooling air, and in addition to attaching a sound absorbing material to the walls of the ventilation passages, one or more sound-insulating plates 10, 11 are provided in the passages. Is provided to reduce (silence) leakage of sound waves from the ventilation passage.

The sound waves that have propagated are weakened by the sound absorbing material on each wall, and part of them propagates through the through holes 22 of the sound insulating plate. Then, the space up to the next sound insulation plate has an effect as an expansion and silencing chamber for sound waves. The ratio of the through-holes 22 to the total area of the sound insulation plate is appropriately in the range of 0.7 to 0.07, and it is better that the ratio is small from the viewpoint of noise reduction, but the total area of the through-holes is such that the cooling air passes through. Since it becomes a mouth, it is necessary to have an area that does not increase the pressure loss of the fan means. The wind speed of the cooling air in the opening area is 10 m / sec or less,
It was experimentally found that it is preferable from the relationship between the fan power ratio and the pressure loss. If it is faster than this, the wind switching sound will be loud. Further, a centrifugal blower type fan means capable of obtaining a wind pressure from a propeller fan is preferable, but in the case of using a centrifugal blower type fan, usually 2 to 6 m / sec is most suitable, and an opening area satisfying this condition is set. preferable. Moreover, the silencing effect is greater when a plurality of small through holes are provided than when a single large through hole is provided.

The sound-insulating air passages 25, 27 provided with one or a plurality of the sound-insulating plates 10, 11 have a passage length of 1/2 to 1/2 as compared with the conventional method in which many bends are provided to increase the passage length.
It can be reduced to 1/5. However, increasing the number of sound insulation plates installed will increase ventilation resistance, so the total area of the through holes of the sound insulation plate and other inflow / outflow passages for cooling air,
It is important to determine the number of installations considering the target noise reduction target, fan capacity, housing volume, etc.

[0024]

EXAMPLES Next, the medical oxygen concentrator of the present invention will be specifically described by way of examples. However, it goes without saying that the present invention is not limited to this.

[Embodiment 1] FIG. 1 is a view showing a preferred embodiment of the present invention. (A) shows a cross section as seen from the lateral direction, and (b) is a cross-sectional view as seen from the rear side so that the atmosphere inflow passage and the atmosphere discharge passage can be clearly seen.

The atmosphere for cooling taken in through the filter 35 from the air intake 30 provided on the front surface of the outer shell 1 serving as the housing of the oxygen concentrator is provided with two sound insulating plates 10. From the inlet 12 through the ventilation passage 25, it enters the elongated chamber 31 in which the adsorption cylinders 4 and 4 ′ of the pressure fluctuation adsorption type oxygen concentrator and the buffer tank 5 are accommodated side by side. This room 31
Includes pipes for connecting the adsorption cylinders 4 and 4 ′, the buffer tank 5 and the like, and functions as the above-described silent device-accommodating and silencing chamber. A sound absorbing material is attached to the four surfaces of the chamber 31, and the atmosphere that has entered from the sound insulation ventilation passage 25 on the left side flows through the chamber 31 accommodating this silent device from the outlet 7 to the side opposite the chamber 31. .

A soundproof box as shown in FIG. 4 is housed on the opposite side of the chamber 31. That is, the first contains the compressed air supply means 19 including an electric motor and an air compressor which are sound sources, and the automatic valves 21 for sending / cutting off the compressed air to / from the adsorption cylinder or for decompressing exhaust from the adsorption cylinder. The soundproof box 16 and the second soundproof box 14 connected to the soundproof box 16 through the communication opening 29 and housing the fan 15 are housed. Then, the second soundproof box 14 is provided with an air intake 17 at a position facing the outlet 7 of FIG. 1, the cooling air is taken in by the fan 15, and passes through the communication opening 29, It flows out from the air outflow opening 18 of the first soundproof box 16.

Compressed air supply means 19 in the soundproof box
Has a mounting structure that is supported by a spring 20 so that vibration is not transmitted to the soundproof boxes 14 and 16 and the outer shell 1. On the other hand, the noise emitted from the noise devices in the soundproof box is first blocked by the walls of the first and second soundproof boxes, but the noise leaking from the air intake 17 of the soundproof box against the air flowing in is: From the outlet 7, it enters the chamber 31 accommodating silent equipment, and is first muted by expansion, and at the same time it hits the adsorption cylinder and the buffer tank, it is further muted by the sound absorbing material provided on the wall surface of the room every time it is scattered. The noise enters the ventilation passage 25, is muffled by the sound insulation plate 10, and leaks out through the filter 35 from the atmosphere intake 30, but when reaching the human ear, the noise is sufficiently low.

Next, the air that has been warmed by heat exchange in the soundproof box is discharged from the air outflow opening 18, which is the air exhaust port 9 provided on the bottom surface of the outer shell 1 shown in FIG.
The air outlet 9 is connected to an underfloor sound insulation duct 2 provided under the floor of the apparatus. The underfloor sound insulation duct 2 has a cross-sectional structure as shown in FIG. 6A, three sound insulation plates 13 are installed in a linear passage, and exhaust air passes through the exhaust passage 26 and is indicated by an arrow. It is discharged from the discharge port 28 to the outside of the machine in the direction shown. The noise generated in the soundproof box is transmitted from the air outflow opening 18 to the air outlet 9
Underfloor sound insulation duct 2 installed under the floor of the outer shell housing
Then, the sound is absorbed by the expansion muffler and the sound insulation plate 13, and a part of the sound is absorbed by the sound absorbing material stretched on the inner wall surface to be weakened. Although part of the noise that has passed through the exhaust passage 26 of the underfloor sound insulation duct 2 while being muted in this way exits into the atmosphere through the exhaust port 28 and reaches the human ear,
The noise level is sufficiently low as at the entrance of the atmosphere.

It is preferable that the number of sound insulation plates is as small as possible if the required sound insulation effect is obtained, because air resistance of ventilation is reduced, and the range of 1 to 6 sheets for each of the air inflow passage and the air exhaust passage is preferable. A suitable and conventionally known means may be combined with a sound deadening means by bending, and one of the inflow or discharge passage may be formed by a bending means and one by a sound insulating plate means. Meanwhile, the sound insulating plate means has an advantage that the passage length can be shortened as compared with the bending means. That is, although depending on the size structure of the sound insulating plate, in the pressure fluctuation adsorption type oxygen concentrator of this embodiment, the sound deadening effect is exhibited by arranging the sound insulating plates having the structure shown in FIG. 5 at a pitch of 30 to 100 mm. By shortening the passage length, the device can be made smaller and lighter. Further, although the sound insulation plate may be attached to the passage at a right angle, it may be better to provide some angle. The angle is preferably in the range of 90 ° ± 60 ° with respect to the air flow direction.

[Embodiment 2] FIG. 2 is a view showing another preferred embodiment of the present invention, in which (a) is a sectional view as seen from the side and (b) is a sectional view.
FIG. 4 is a cross-sectional view seen from the rear. This is the same as the first embodiment of FIG. 1 on the inflow side of the cooling air, but is different on the outflow side of the air warmed in the soundproof box. That is, in the first embodiment, the atmosphere discharge opening 18 of the second soundproof box 16 is
The outer shell 1 is provided in contact with the atmospheric air outlet 9 on the bottom surface of the housing, and the discharged air directly enters the underfloor sound insulation duct 2 installed under the floor of the outer shell housing. In Example 2, a sound insulating ventilation path 27 provided with three sound insulating plates 11 is provided between the air discharging opening 18 and the air discharging port 9 on the bottom surface of the casing of the outer shell 1. The air discharge opening 18 of the second soundproof box 16 is located on the front lower side surface, which is in contact with the air discharge port 8 of the sound insulation ventilation passage 27, and the exhaust air enters the sound insulation ventilation passage 27 from the air discharge opening 8 and The underfloor sound insulation duct 2 is adapted to enter from the air outlet 9 on the bottom surface of the outer casing 1. By adopting such a structure, the noise that leaks to the surroundings and reaches the human ear is sufficiently small, and it is not a problem as a device used indoors.

[Embodiment 3] FIG. 3 is a view showing still another preferred embodiment of the present invention, in which (a) is a sectional view seen from the side,
(B) is a sectional view seen from the rear. The discharge side of the air warmed in the soundproof box is the same as that of the first embodiment in FIG. 1, but the cooling air inflow side is different. That is, in the first embodiment, the cooling air taken in through the air intake 30 provided on the front surface of the outer shell 1 serving as the housing passes through the sound-insulating ventilation passage 25 provided with the two sound-insulating plates 10. , Adsorption cylinder 4,
4'and a buffer tank 5 are arranged side by side in an elongated chamber 3
In contrast to the first embodiment, in the third embodiment,
The atmosphere entering through the air intake 30 proceeds downwards through the sound insulation ventilation passage 25 in which the two sound insulation plates 10 are obliquely attached, and then passes through another sound insulation plate 10 which is horizontally attached and the sound deadening chamber 34. Then, from the inlet 12 provided at the lower part of the muffling chamber 34, the suction chambers 4 and 4'and the buffer tank 5 enter the elongated chamber 31 accommodating side by side.

The silencer chamber 34 has an IC, a condenser, and an IC for controlling the operation of an automatic valve, an electric motor, and an air compressor.
The electrical control device 36 including a resistor, a relay, and the like, which is a printed circuit board, and a connector and a wiring for connecting them are housed to form the silent device housing silencing chamber. A sound absorbing material is attached to the wall of the muffling chamber 34, and absorbs sound waves reflected by the components of the electric control device 36 to muffle the sound. By taking such a structure,
The noise leaking to the surroundings was sufficiently low, and it was not a problem as a medical device used indoors.

Next, test data for confirming the sound deadening effect of the sound insulation plate and the underfloor sound insulation duct according to the present invention will be shown. The noise level changes greatly due to reflected sound, background noise, etc., depending on the conditions of the room to be measured.
(A) In the following noise measurement room, measurement was performed 1 m in front of the center of the device, and comparison was made under the same conditions. However, in all the devices to be measured, the sound absorbing effect was perfected by using six sound insulating plates on the air inflow passage side, and the conditions were changed only on the air exhaust passage side for comparison. The exhaust passage cross-sectional area was the same.

Example 4 Three sound insulating plates with a porosity of 35% were attached to the atmosphere discharge passage (passage length 300 mm) provided in the lower portion of the outer shell casing. [Embodiment 5] A sound insulation plate is not provided in the atmosphere discharge passage (bending number 2) in the lower part of the outer shell housing, and an underfloor sound insulation duct having a structure shown in FIG. 6A is attached to the outer lower surface of the outer shell housing bottom plate of the device. It was In the duct, three sound insulating plates with a porosity of 35% were installed. [Comparative Example 1] Two protrusion plates were provided alternately in the upper and lower portions inside the atmosphere discharge passage in the lower portion of the outer shell casing to bend the passage. [Comparative Example 2] Measurement was made without a sound insulating plate in the air discharge passage in the lower part inside the outer shell case, and this was set as a comparative example.

The results of these measurements are summarized in Table 1. By using the sound insulation plate or the underfloor sound insulation duct according to the present invention, a sound deadening effect equivalent to or more than the conventional method of bending the air passage can be obtained. I understand.

[0037]

[Table 1]

[0038]

EFFECTS OF THE INVENTION A sound insulating plate is provided in the air inflow passage and the air exhaust passage of the oxygen concentrator, or an underfloor sound insulating duct is attached to the outer lower surface of the bottom plate of the outer shell of the device without increasing the passage length. As a result, it is possible to obtain a sufficient silencing effect, and as a result, the atmosphere inflow / exhaust passage can be simplified, the space inside the outer shell housing can be effectively utilized, and the entire device can be downsized.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a medical oxygen concentrator according to an embodiment of the present invention.

FIG. 2 is a view showing the structure of a medical oxygen concentrator according to another embodiment of the present invention.

FIG. 3 is a view showing the structure of a medical oxygen concentrator according to another embodiment of the present invention.

FIG. 4 is a diagram showing an example of the structure of a soundproof box housed in the outer shell of the oxygen concentrator.

FIG. 5 is a diagram showing a configuration of a sound insulation plate in the present invention.

FIG. 6 is a diagram showing an example of the structure of an underfloor sound insulation duct according to the present invention.

FIG. 7 is a diagram showing an example of a bent atmospheric passage of a conventional oxygen concentrator.

[Explanation of symbols]

 1 Outer Shell 2 Underfloor Sound Insulation Duct 7 Outlet 8,9 Air Outlet 10, 11, 13 Sound Insulation Plate 12 Inlet 14 Second Soundproof Box 16 First Soundproof Box 17 Air Inlet 18 Air Outflow Opening 22 Through Hole 23 Sound Insulation Material 24 Sound Absorption Material 25, 27 Sound Insulation Ventilation Path 26 Exhaust Passage 28 Exhaust Port 30 Atmosphere Inlet 34 Silencer Room

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Sato 7-17-8 Hatigasaki, Yonago City, Tottori Prefecture

Claims (5)

[Claims] 1. An adsorption cylinder filled with an adsorbent that selectively adsorbs moisture and nitrogen gas in the atmosphere, a buffer tank for storing oxygen-enriched air discharged from the adsorption cylinder, and compressed air supplied to the adsorption cylinder. For controlling the compressed air supply means including an electric motor and an air compressor driven by the electric motor, conduits connecting the compressed air supply means and the adsorption cylinder, automatic valves provided in the conduits, and the automatic It consists of electrical control equipment for controlling the operation of valves and compressed air supply means and its wiring, and noise equipment such as electric motors, air compressors, automatic valves, etc. that are noise sources are in a soundproof box with soundproof walls. In the pressure fluctuation type oxygen concentrator installed in the silence chamber, the noise absorbing equipment such as the adsorption cylinder, the buffer tank, the conduits, the electric control equipment, and the wiring that are housed in The atmosphere inflow passage between the air intake provided in the shell casing and the air inflow opening of the soundproof box constitutes a silent chamber for accommodating silent equipment as a part thereof. One or both of the air discharge passages between the outflow opening and the air discharge port provided in the outer shell housing are provided with a sound insulation ventilation path provided with one or more sound insulation plates. Oxygen concentrator. 2. The atmosphere exhaust port of the atmosphere exhaust passage is provided on the bottom surface of the outer shell casing, and an underfloor sound insulation duct provided with one or more sound insulation plates is connected to the lower surface of the outer shell housing to discharge to the atmosphere. The oxygen concentrating device according to claim 1, wherein the oxygen concentrating device is part of a passage. 3. The pressure fluctuation type oxygen concentrating device according to claim 1, wherein an atmosphere inflow passage is provided between an atmosphere intake port provided in an outer shell casing made of a soundproof wall and an atmosphere inflow opening portion of the soundproof box. It is composed of a sound-insulating air passage provided with one or more sound-insulating plates, and the silent chamber for accommodating the silent equipment following it, and the atmosphere outflow opening of the soundproof box is in close contact with the air outlet on the bottom surface of the outer casing. The oxygen concentrating device is characterized in that an underfloor sound insulation duct having one or a plurality of sound insulation plates attached to the lower surface of the outer casing is connected to serve as an air discharge passage. 4. The pressure fluctuation type oxygen concentrator according to claim 1, wherein an atmosphere inflow passage is provided between an atmosphere intake provided in an outer shell casing made of a soundproof wall and an atmosphere inflow opening of the soundproof box, A sound insulating ventilation passage provided with one or more sound insulating plates, and a silent chamber for storing the silent equipment following the sound insulating ventilation passage, and an air outflow opening of the soundproof box and an air outlet provided in the outer shell housing. An air discharge passage provided with one or a plurality of sound insulation plates is provided between them, and the air discharge port of the air discharge passage is provided on the bottom surface of the outer shell casing, and one is provided on the lower surface of the outer shell casing. Alternatively, an oxygen concentrating device characterized in that an underfloor sound insulation duct provided with a plurality of sound insulation plates is connected to form a part of an atmosphere discharge passage. 5. A silent device storage / silence room which constitutes an atmosphere inflow passage, and a silent device storage / silence room which houses a silent device group of an electric system such as an electric control device, wirings, etc., an adsorption cylinder, a buffer tank, and a conduit. 5. The oxygen concentrating device according to claim 3 or 4, wherein the oxygen concentrating device comprises two silencer-equipment silencing chambers accommodating a silent equipment group such as an air system.