JPH0744362U - Solenoid valve for adsorption-type oxygen concentrator - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the adsorption type oxygen concentrator solenoid valve is to reduce the operating noise emitted to the surroundings. [Structure] A pair of valve seats 24 provided in the valve chamber 23 so as to face each other, and a common port 26 communicating between the valve seats 24 and the valve chamber 23.
And a pair of select ports 27 and 28 communicating with the valve chamber 23 outside both valve seats 24, and a valve 25 that selectively closes both valve seats 24 by the electromagnetic actuator 22. In the valve, when the valve element 25 is displaced from the center between the valve seats 24 toward any one valve seat 24 side by a predetermined amount or more, the other valve seat 24 is opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve for an adsorption-type oxygen concentrator, and more particularly to a solenoid valve for an adsorption-type oxygen concentrator capable of reducing operating noise emitted to the surroundings.

[0002]

[Prior art]

 An adsorption-type oxygen concentrator is a device that raises the oxygen concentration by adsorbing nitrogen in the air to a nitrogen adsorbent. Used when supplying. In this adsorption type oxygen concentrator, for example, as shown in the configuration diagram of FIG. 4, room air is compressed by an air compressor 1 and sent to an adsorption tank 3, and nitrogen is adsorbed in the adsorption tank 3 with nitrogen. It is configured to be adsorbed and thereby send out the air having an increased oxygen concentration to the outside.

The nitrogen adsorption capacity of the adsorbent can be recovered by setting the internal pressure of the adsorption tank 3 to a negative pressure and releasing nitrogen. Therefore, if the compressed air is supplied to the intake tank 3 and the high oxygen concentration air is discharged to the outside, and the suction of nitrogen from the intake tank 3 is repeated alternately, the oxygen concentration is increased above a certain level. The supplied air can be continued for a long time.

Therefore, in a general adsorption-type oxygen concentrator, as shown in each equivalent circuit diagram of FIG. 4, FIG. 5 or FIG. 6, a 5-port solenoid valve is provided between the air compressor 1 and the adsorption tank. 2 (100, 200) are interposed to switch the intake passage 1a of the air compressor 1 to the atmosphere in the room and to the adsorption tank 3 and to connect the discharge passage 1a of the air compressor 1 to the adsorption tank 3 and the interior of the room. It is configured to switch and connect to the atmosphere so that the internal pressure of the adsorption tank 3 is periodically switched between positive pressure and negative pressure as shown in the pressure characteristic diagram of FIG. It

Examples of such a 5-port solenoid valve 2 include a metal spool type solenoid valve 100 as shown in the sectional views of FIGS. 5 and 8, and a poppet as shown in the sectional views of FIGS. 6 and 9. There is a seal type solenoid valve 200. In this metal spool type solenoid valve 100, as shown in FIG. 8, a spool 102 having two reduced diameter portions is inserted into a cylindrical valve chamber 101 so as to be able to move forward and backward, and a groove-shaped groove is formed on the circumferential surface of the valve chamber 101. The five ports 103 to 107, which are open to the outside, are selectively connected to each other via the reduced diameter portion of the spool 102.

In this metal spool type solenoid valve 100, foreign matter is caught between the peripheral surface of the valve chamber 101 and the land portion 108 of the spool 102 to damage the peripheral surface of the valve chamber 101 or the spool 102, or to operate. A defect may occur. As shown in FIG. 9, a poppet seal type solenoid valve 200 includes two valve chambers 202 formed in a body 201, a pair of valve seats 203 facing each other in each valve chamber 202, and a pair of valve seats 203. It has a valve element 204 that moves back and forth between valve seats 203.

A common port 205 that connects the portion of the valve chamber 202 between the two valve seats 203 and the intake passage 1 a or the discharge passage 1 b of the air compressor 1, and the valve chamber 202 outside one of the two valve seats 203. Is connected to the atmosphere in the room, and a selection port 207 is connected to the adsorption tank 3 at the part of the valve chamber 202 outside the other of the valve seats 202. Further, in order to guide the valve element 204 forward and backward, the stems 208 are extended on both sides in the forward and backward direction of the valve element 204, and these stems 208 are slidably inserted into the guide holes 209.

A seal ring 210 that seals between the stem 208 and the guide hole 209 and a guard ring 211 that is arranged closer to the valve chamber 202 than the seal ring 210 are fitted on the stem 208. Also, by reducing the diameter of the stem 208 between the seal ring 210 and the guard ring 211, pockets 212 for collecting foreign matter are formed. The valve elements 204 are turned on and off with a phase difference of 180 °. Are driven forward and backward by two solenoids 213 and return springs 214 that oppose each solenoid 213, whereby one valve element 204 makes the selection port 207 and the common port 205 communicate with each other and the adsorption tank 3 compresses air. When connected to the suction passage 1a or the discharge passage 1b of the machine 1, the other valve 204 makes the discharge passage 1b or the suction passage 1a of the air compressor 1 communicate with the selection port 206.

This poppet seal type solenoid valve 200 is advantageous over the metal spool type solenoid valve 100 in that there is no risk of foreign matter in the air getting caught between the valve element 204 and the valve seat 203. . Further, by providing the guard ring 211 and the pocket 212, foreign matter wiped from the inner peripheral surface of the guide hole 209 by the seal ring 210 is stored in the pocket 212, and when a predetermined amount or more of foreign matter is stored in the pocket 212, the guard ring 211 is removed. It is elastically deformed and foreign matter is discharged to the valve chamber 202 side. This prevents foreign matter from accumulating on the inner surface of the guide hole 209, eliminating the risk of foreign matter being caught between the seal ring 211 and the guide hole 209, and eliminating the risk of malfunction due to this foreign matter.

In the adsorption-type acid concentrator, the malfunction of the solenoid valve is a fatal problem, and it is a fatal problem. It is required to prevent malfunction even under the following conditions. To be Therefore, it can be said that the poppet seal type solenoid valve 200, which is less likely to cause malfunction, is more suitable for the adsorption type acid concentrator than the metal spool type solenoid valve 100, which is likely to malfunction.

[0011]

[Problems to be solved by the device]

 By the way, in the poppet seal type solenoid valve 200, when supplying high oxygen concentration air (hereinafter referred to as adsorption mode), as shown in FIG. 9, it is connected to the suction passage 1a of the pneumatic compressor 1. The selected common port 205 is communicated with the selection port 206 communicating with the room, and the common port 205 connected with the discharge passage 1b of the air compressor 1 is communicated with the selection boat 207 communicating with the adsorption tank 3.

Further, when the nitrogen in the adsorption tank 3 is discharged (hereinafter, referred to as an exhaust mode), as shown in FIG. 10, the common port 205 connected to the suction passage 1 a of the air compressor 1 is adsorbed. The common port 205 connected to the selection boat 207 communicating with the tank 3 and connected to the discharge passage 1b of the air compressor 1 is communicated with the selection port 206 communicating with the room. At the time of switching between the adsorption mode and the exhaust mode, as shown in FIG. 11, both valve elements 204 are transiently separated from the valve seats 203 on both sides at the same time to be in an all-open state, and the air compressor in the valve chamber 202 is opened. Since the pressurized air suddenly flows into the selection port 206 side communicating with the room from the common port 205 on the first side and the selection port 207 on the adsorption tank 3 side, in the vicinity of the valve seat 203 on the selection port 206 side. There is a problem that an impact sound is generated in the room and is dissipated into the room through the selection port 206 communicating with the room.

This adsorption-type oxygen concentration concentrator is installed on the bedside of a person who needs to supply oxygen from the outside due to a disorder of the respiratory system. Needs to be small. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electromagnetic valve for an adsorption type oxygen concentrator capable of reducing operating noise emitted to the surroundings.

[0014]

[Means for Solving the Problems]

 The present invention is directed to a pair of valve seats provided in a valve chamber so as to face each other, a common port communicating with the valve chamber between the valve seats, and a pair of selection ports communicating with the valve chamber outside the valve seats. In order to achieve the above object, the adsorbing type oxygen concentrator electromagnetic valve having a valve element that selectively contacts both valve seats by an electromagnetic actuator has taken the following means.

That is, when the valve element is displaced from the center between the valve seats to one of the valve seat sides by a predetermined amount or more, the other valve seat is opened.

[0016]

[Action]

 If the valve is moved from the state in which one valve seat is closed to the direction in which the other valve seat is closed, and if the center between both valve seats is approached by more than a predetermined amount, one valve seat will remain closed and the other valve seat will remain closed. The valve seat is closed, and when the valve element passes through the center between the valve seats and comes close to the other valve seat for a certain amount or more, one valve seat is opened.

That is, there is a time when both valve seats are closed at the same time, the flow of air sent from the air compressor to the adsorption tank 3 side is once dammed in the valve chamber, and then the air is communicated with the inside of the chamber. Since it is switched to the selected port side, the impact noise at the time of switching is reduced.

[0018]

【Example】

 Hereinafter, a solenoid valve for an adsorption type oxygen concentrator according to an embodiment of the present invention will be specifically described with reference to the drawings. As shown in the sectional views of FIGS. 2 and 3, the solenoid valve 2 includes a body 21 and two solenoids 22. Inside the body 21, the solenoids 22 are arranged coaxially with the solenoids 22. Two valve chambers 23 are formed.

A pair of valve seats 24 opposed to each other in the axial direction are provided in each valve chamber 23, and a valve element 25 that advances and retracts between the valve seats 24 is inserted. Further, in the body 21, a common port 26 (26a / 26b) communicating with the portion 23a of each valve chamber 23 between the valve seats 24 and portions 23b, 23c of each valve chamber 23 outside the valve seats 24 are provided. And a pair of selection ports 27, 28 communicating with each other are formed.

As shown in FIG. 2, one of the selection ports 27 and 28 (here, the selection port 27) is individually communicated with the room, and the other (here, the selection port 28) is assembled with each other. It is connected to the adsorption tank 3. The common port 26a of the one valve chamber 23 is connected to the suction passage 1a of the air compressor 1, and the common port 26b of the other valve chamber 23 is connected to the discharge passage 1b of the air compressor 1.

Guide holes 29 coaxially arranged with the valve chamber 23 are formed on both sides of the valve chamber 23 in the axial direction, and a stem 30 extending from both ends of the valve element 25 is formed in the guide hole 29. By slidingly fitting the valve, the valve element 23 is guided to move forward and backward. The solenoid 22 is fixed to one end surface of the body 21, and its output shaft 31 is inserted into one end of the stem 30 in the body 21 so as to be able to advance and retract, and the stem 30 is arranged on the opposite side of the stem 30 to the solenoid 22 side. A return spring 32 for urging is arranged. A pressing spring 33 that transmits the operation of the output shaft 31 to the stem 30 is inserted between the stem 30 and the output shaft 31 of the solenoid 22.

As shown in the enlarged cross-sectional view of FIG. 1, on both sides of the valve element 25, poppet valve seats 34 received by the respective valve seats 24, and projecting from the outer end surface of the poppet valve seat 34, A spool portion 36 that is inserted into and removed from the valve hole 35 in the valve seat 24 is provided. The poppet valve seat 34 and the spool portion 36 are made as an integrated body made of an elastic body such as rubber. Both spool portions 36 are formed so as to project into the valve holes 35 in a sealing manner over a predetermined overlapping dimension when the valve element is positioned in the center between the valve seats.

In the adsorption mode, as shown in FIG. 2, this solenoid valve 2 is connected to the common port 26a connected to the suction passage 1a of the air compressor 1 to the selection port 27 that communicates with the inside of the room, and the air compression is performed. The common port 25b connected to the discharge passage 1b of the machine 1 is connected to the suction tank 3 via the selection port 28. In the exhaust mode, as shown in FIG. 3, the common port 26a connected to the suction passage 1a of the air compressor 1 is connected to the adsorption tank 3 via the selection port 28, and the discharge passage 1b of the air compressor 1 is connected. The common port 25b connected to is connected to the selection port 27 that communicates with the room.

During the transition period from the adsorption mode to the exhaust mode, as shown in FIG. 1, the valve element 25 is configured such that one valve seat 24 receives the poppet valve seat 34 and closes the valve seat 24. From the state, the other valve seat 34 is moved in the closing direction. In this transitional period, in the valve chamber 23 to which the discharge passage 1b of the air compressor 1 is connected, when the valve element 25 approaches the center of both valve seats 24 from the valve seat 24 on the selection port 27 side by a predetermined amount or more, selection is made. While the valve hole 35 of the valve seat 24 on the port 27 side is closed by the spool portion 36, the spool portion 36 on the opposite side protrudes into the other valve seat 24, that is, the valve hole 35 on the selection port 28 side. Close this. Then, when the valve element 25 further passes through the center between the valve seats 24 and approaches the valve seat 24 on the selected port 28 side by a predetermined amount or more, the spool portion 36 on the selected port 27 side causes the valve portion on the hull port 27 side to move. It comes out of the valve hole 35 of the seat 24 and opens the valve seat 24.

That is, there is a time when both valve seats 24 are closed at the same time, and the flow of air sent from the air compressor 1 to the adsorption tank 3 side in the valve chamber 23 is once blocked and then Since it can be switched to the side of the selection port 27 that communicates with the room, the impact noise at the time of switching can be reduced by about 10 dB, and the maximum operating noise can be suppressed to 72 dB or less, and the average value is also suppressed to about 24 dB. I was able to.

In addition, in the measurement of the operation noise of this conventional example and the above-mentioned one example, a dummy tank having an internal pressure of 0.2 MPa and a capacity of 7 liters was connected instead of the adsorption tank 3, and a location 50 cm away from the solenoid valve 2 was used. Measured using an ordinary sound level meter according to JIS C1502 standard

[0027]

[Effect of device]

 As explained above, in the present invention, in the poppet seal type adsorption type oxygen concentrator solenoid valve, when the valve element is displaced from the center between the valve seats to any one valve seat side by a predetermined amount or more, Since it is formed to open the valve seat, when the selected port connected to the discharge path of the air compressor is switched by the movement of the valve, the discharge path is temporarily cut off from both select ports to release high pressure air. Since it can be dammed in the valve chamber, the impact noise caused by switching the valve can be reduced, and the operating noise can be reduced.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part of the present invention during a transition period.

FIG. 2 is a sectional view of the present invention in a suction mode.

FIG. 3 is a cross-sectional view of an exhaust mode of the present invention.

FIG. 4 is a configuration diagram of an adsorption type oxygen concentrator.

FIG. 5 is an equivalent circuit of an adsorption type oxygen concentrator.

FIG. 6 is another equivalent circuit of the adsorption type oxygen concentrator.

FIG. 7 is a pressure characteristic diagram of the internal pressure of the adsorption tank.

FIG. 8 is a cross-sectional view of a conventional example of a metal spool type.

FIG. 9 is a cross-sectional view of a poppet seal type conventional example in a suction mode.

FIG. 10 is a sectional view of a poppet seal type conventional example in an exhaust mode.

FIG. 11 is a cross-sectional view of a poppet seal type conventional example in a transition period.

[Explanation of symbols]

 22 ... Electromagnetic actuator 23 ... Valve chamber 24 ... Valve seat 25 ... Valve 26 ... Common port 27 ... Selection port 28 ... Selection port 34 ... Poppet valve seat 35 ... Valve hole 36 ... Spool section

Claims (2)

[Scope of utility model registration request] 1. A pair of valve seats that are provided in the valve chamber so as to face each other, a common port that communicates with the valve chamber between both valve seats, and a pair that communicates with the valve chamber outside both valve seats. In a solenoid valve for an adsorption type oxygen concentrator having a port and a valve element that is selectively brought into contact with both valve seats by an electromagnetic actuator, the valve element has a predetermined amount from the center between the valve seats to any one valve seat side. An electromagnetic valve for an adsorption type oxygen concentrator, which is formed so as to open the other valve seat when displaced. 2. A poppet valve seat that is received by each valve seat, and a spool portion that projects from an outer end surface of the poppet valve seat and is inserted into and removed from a valve hole in the valve seat are provided on both sides of the valve element. 2. The suction device according to claim 1, wherein both spool portions are formed so as to project into the valve hole in a sealing manner over a predetermined overlapping dimension when the valve element is positioned in the center between the valve seats. Type solenoid valve for oxygen concentrator.