JPS60118603A - Oxygen enriching device - Google Patents

Abstract

PURPOSE:To silence sound of pulsatory motion of piping and noise caused by vibration, and to reduce noise of the whole oxygen enriching device, by setting an orificial muffler at a discharge opening of a vacuum pump arranged in a pump chamber. CONSTITUTION:The vacuum pump 5 is started, atmosphere is introduced through the selective permeable membrane 3 having high permeability velocity of oxygen than that of nitrogen into the collecting pipe 4, sent from the feed passage 5a for oxygen enriched air through the pump 5, the piping 8 at the discharge opening side, the orificial muffler 7, the feed passage 5b for oxygen enriched air, the cooling pipe 12, the separating pipe 13, the flow rate regulator 17, the active carbon filter 15, the membrane filter 16 to the flowmeter 18, and oxygen enriched air obtained from the feed opening 6. Since about 1.5kg/cm<2> back pressure is applied to the interior of the piping 8 at the discharge opening at the starting of the pump, and considerable load is applied to the pump 5, the safety valve 10 is set between the discharge opening side of the pump 5 and the muffler 7. When the back pressure at the discharge opening of the pump 5 reaches >=a given pressure, the pressure is liberated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a muffler for a medical oxygen enricher.

Conventional Structure and Problems Due to the nature of the device, oxygen enrichers are used in hospitals or homes where patients are present. Therefore, low noise is desired. Therefore, in conventional oxygen enrichers, a vacuum pump such as a diaphragm vacuum pump that sucks air is installed in a pump chamber, and the inside of this pump chamber is soundproofed with sound insulating materials such as lead sheets or sound absorbing materials such as urethane. was giving. However, when a vacuum pump operates, it generates a considerable amount of heat and must be cooled. Since cooling is normally performed by a cooling fan, a hole is required to ventilate the pump chamber. For this reason, even if soundproofing is done, sound leaks from the holes, and the vacuum pump, which has a high noise value, generates considerable vibration and pulsating flow from the discharge port. This pulsating flow was transmitted through the gully pipes and was one of the causes of noise.

OBJECT OF THE INVENTION Therefore, the present invention solves the drawbacks of the above-mentioned conventional example.
The purpose is to lower the noise level of the entire oxygen enricher by lowering the noise level of the vacuum pump itself, eliminating pulsating flow, and eliminating piping vibration or pulsating noise caused by the pulsating flow. Another object is to prevent a large burden from being placed on the vacuum pump by preventing the back pressure at the discharge port of the vacuum pump from becoming higher than a certain pressure.

Structure of the Invention The present invention provides an orifice-shaped muffler at the discharge port of a vacuum pump, and this vacuum pump is installed in the pump chamber, thereby reducing the noise level of the vacuum pump itself, eliminating pulsating flow, and eliminating noise generated from pulsating flow. This is to stop the vibration or pulsating noise of pipes. 1. If a silencer is installed at the discharge port of the vacuum pump, the back pressure will be high at startup and the load on the vacuum pump will be heavy. Therefore, a safety valve such as a relief valve is installed, and when the pressure exceeds a certain level, the pressure is released from the safety valve. It is something.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is the main body of the oxygen enricher, and an atmospheric air inlet 2 is provided on the side of 1. 3 is a selectively permeable membrane having a higher permeation rate for oxygen than nitrogen; 4 is a collecting pipe provided to collect the oxygen-enriched air obtained by passing through this selectively permeable membrane 3; An oxygen-enriched air supply path 6b connects an inlet-side pipe 68 to the collecting pipe 4 so as to pass through the selective permeable membrane 3, and supplies an oxygen-enriched air supply port 6 provided on the main body 1 at the outlet side. A vacuum pump 7 connected to the vacuum pump 6 is an orifice-shaped muffler installed in the discharge port side pipe 8 of the vacuum pump 6, and has a small diameter hole 9 therein for muffling pulsating sound. 1o is a safety valve provided in a branch pipe 8a branched from the discharge port side piping 8 between the discharge port of the vacuum pump 6 and the muffler 7; -1 is a safety valve provided on both sides of the vacuum pump 5, and 12 is a cooling pipe that cools the oxygen-enriched air, 13 is a separation tube that separates water and air from the oxygen-enriched air, 14 is an evaporator, and 16 is a device that removes pollutants from the oxygen-enriched air. Activated carbon filter, 16 is membrane filter, 1
7 is a flow rate regulator for oxygen-enriched air, and 18 is its flow meter. 19 is a vacuum gauge, and 20 is a power switch. 21
This pump room is soundproofed by pasting a sound insulating material 22 such as lead and a sound absorbing material 23 such as urethane inside, and is equipped with a vacuum pump 5, a silencer γ, and a safety valve 10.

In the above configuration, when the vacuum pump 6 is activated by the power switch 2o, the air flows in from the suction port 2 and is sucked in through the selectively permeable membrane 3, and the air is sucked into the collecting pipe 4-→oxygen-enriched air supply path 5a→vacuum pump 5. →Discharge side piping 8→Silencer 7→
Oxygen-enriched air supply path 6b → cooling pipe 12 → separation pipe 13 → flow rate regulator 17 → activated carbon filter 15 → membrane filter 16 → air flow 18 → all passages, oxygen-enriched air supply port 6
More oxygen-enriched air can be obtained. The vacuum pump 5 is stabilized at a vacuum level of 260 torr by the selectively permeable membrane 3.
By using an orifice with an inner diameter of 1.0 mm and a body length of 16 mm in the discharge port piping 8, the back pressure is normally 0.2 to 4/crA. However, at startup, the pressure becomes about 1.5 Kg/crl, which places a considerable burden on the vacuum pump 6. Therefore, a safety valve 10'z was installed, and 0.6 and 9. /CI! The vacuum pump can be protected by setting it to release pressure. The pump chamber 21 is soundproofed as shown above, and the cooling fan 1 is installed to cool the vacuum pump 5.
There is an opening through which air from the vacuum pump 6 enters, and this causes noise to leak from the vacuum pump 6.

However, since a muffler 7 is provided on the piping on the discharge port side of the vacuum pump 1 to eliminate the noise, the pulsating flow noise and vibrations caused by the pulsating flow can be eliminated by rectifying the pulsating flow. Further, by installing the muffler 7 inside the pump chamber 21, pulsating noise and vibrations are prevented from coming out of the pump chamber 21, and the noise of the oxygen enricher can be lowered as a whole.

Effects of the Invention As described above, according to the present invention, by providing a muffler having an orifice at the discharge port of the vacuum pump, noise caused by pulsation and vibration of the piping can be eliminated, and the noise of the oxygen enricher as a whole can be reduced. can be lowered to eliminate the unique harsh sound of pulsating flow. Furthermore, by providing a safety valve on the discharge port side of the vacuum pump in front of the muffler, the burden on the vacuum pump during startup can be reduced and protected.

[Brief explanation of drawings]

4 is a sectional view of the same muffler. 3... Selective permeable membrane, 5... Vacuum pump, 8... Discharge port side piping, 7... Silencer, 1o... ·safety valve. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A selective permeable membrane that has a higher permeation rate for oxygen than nitrogen, a vacuum pump that takes in all of the atmosphere through the selective permeable membrane, and an orifice-like structure installed in the piping on the outlet side of the vacuum pump to eliminate the pulsating sound of the piping. An oxygen enricher consisting of a silencer and a safety valve that is installed between the discharge port side of the vacuum pump and the silencer and releases pressure when the back pressure at the discharge port of the vacuum pump exceeds a predetermined pressure.