JP2594442Y2 - Solenoid valve for adsorption type oxygen concentrator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for an adsorption-type oxygen concentrator, and more particularly to a solenoid-type valve for an adsorption-type oxygen concentrator capable of reducing operating noise radiated to the surroundings.

[0002]

2. Description of the Related Art An adsorption-type oxygen concentrator is a device for increasing the oxygen concentration by adsorbing nitrogen in the air with a nitrogen adsorbent. For example, a person who needs an external supply of oxygen due to a trouble in the respiratory system. Used to supply oxygen to
This adsorption-type oxygen concentrator compresses indoor air with an air compressor 1 and sends it to an adsorption tank 3 as shown in the configuration diagram of FIG. 4, for example, and converts nitrogen into a nitrogen adsorbent filled in the adsorption tank 3. It is configured to adsorb and thereby deliver air having an increased oxygen concentration to the outside.

[0003] The nitrogen adsorption capacity of the adsorbent can be restored by releasing the nitrogen by setting the internal pressure of the adsorption tank 3 to a negative pressure. Therefore, by alternately repeating supplying the compressed air to the intake tank 3 and discharging the high oxygen concentration air to the outside and sucking nitrogen from the intake tank 3, the air having the oxygen concentration increased to a certain level or more can be obtained. Supply 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.
5 port solenoid valve 2 between air compressor 1 and adsorption tank
(100, 200), the suction passage 1a of the air compressor 1 is switched and connected to the indoor atmosphere and the suction tank 3, and the discharge passage 1a of the air compressor 1 is connected to the suction tank 3 and the indoor air. The internal pressure of the suction tank 3 is periodically switched between the positive pressure and the negative pressure as shown in the pressure characteristic diagram of FIG. 7 in accordance with, for example, the cycle of human breathing.

The five-port solenoid valve 2 includes, for example, 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. There is a seal type solenoid valve 200. As shown in FIG. 8, a metal spool type solenoid valve 100 has a cylindrical valve chamber 101 in which a spool 102 having two reduced diameter portions is inserted so as to be able to advance and retreat, and a groove is formed on the peripheral surface of the valve chamber 101. The five ports 103 to 107 that open to the spool 102
Are configured to be selectively communicated via the reduced diameter portion.

This metal spool type solenoid valve 100
In some cases, foreign matter may be caught between the peripheral surface of the valve chamber 101 and the land portion 108 of the spool 102, thereby damaging the peripheral surface of the valve chamber 101 and the spool 102, or causing malfunction. As shown in FIG. 9, the poppet seal type solenoid valve 200
Two valve chambers 202 formed in the body 201 and each valve chamber 20
2, a pair of valve seats 203 facing each other,
And a valve 204 that moves back and forth between the levers 203.

[0007] A common port 205 for communicating a portion of the valve chamber 202 between the two valve seats 203 with the suction passage 1a or the discharge passage 1b of the air compressor 1, and a valve on the outside of one of the two valve seats 203. And a selection port 206 for communicating the portion with the atmosphere inside the room, and a portion of the valve chamber 202 outside the other of the two valve seats 202 is connected to the adsorption tank 3.
And a selection port 207 that communicates with the In addition, valve 20
4 are guided on both sides of the valve 204 in the reciprocating direction, and the stems 208 are inserted into the guide holes 209.
Is slidably inserted into

The stem 208 has a seal ring 210 for sealing between the stem 208 and the guide hole 209, and the seal ring 210.
A guard ring 211 arranged closer to the valve chamber 202 than the outside is fitted to the outside. Also, this seal ring 210 and guard ring
By reducing the diameter of the stem 208 between itself and the valve 211, each valve element 204 is formed with a pocket 212 for capturing foreign matter.
213 and each return spring 214 opposing each solenoid 213 are driven forward and backward, whereby one valve 204 communicates the selection port 207 with the common port 205 and the suction tank 3 sucks the air compressor 1. When connected to the passage 1a or the discharge passage 1b, the other valve 204 connects the discharge passage 1b or the suction passage 1a of the air compressor 1 to the selection port 206.

The poppet seal type solenoid valve 200 is more advantageous than the metal spool type solenoid valve 100 in that foreign matter in the air is less likely to bite between the valve element 204 and the valve seat 203. . Further, by providing the guard ring 211 and the pocket 212, foreign matter that the seal ring 210 wipes from the inner peripheral surface of the guide hole 209 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 formed. Foreign matter is released to the valve chamber 202 by elastic deformation. This prevents foreign matter from accumulating on the inner surface of the guide hole 209.
There is no danger that a foreign matter will bite between the 209 and 209, and there is no possibility that a malfunction may occur due to the foreign matter.

[0010] In the adsorption-type acid concentrator, the malfunction of the solenoid valve is related to human life, which is a serious problem, and it is required to prevent the malfunction under the following conditions. Therefore, the poppet seal type solenoid valve 200 which is less likely to malfunction than the metal spool type solenoid valve 100 which is likely to malfunction.
Can be said to be more suitable for the adsorption type acid concentrator.

[0011]

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

When the nitrogen in the adsorption tank 3 is discharged (hereinafter, referred to as an exhaust mode), a common port connected to the suction passage 1a of the air compressor 1 as shown in FIG.
A common port 205 is connected to the selection boat 207 communicating with the adsorption tank 3 and connected to the discharge path 1b of the air compressor 1.
205 is connected to a selection port 206 communicating with the room. At the time of switching between the adsorption mode and the exhaust mode, as shown in FIG.
From the common port 205 on the air compressor 1 side and the selection port 207 on the adsorption tank 3 side into the selection port 206 communicating with the room in the valve chamber 202. Since the flow suddenly flows, there is a problem that an impact sound is generated in the vicinity of the valve seat 203 on the side of the selection port 206, and the noise is radiated into the room through the selection port 206 communicating with the room.

[0013] Since the adsorption type oxygen concentration concentrator is installed at the bedside of a person who needs oxygen supply from the outside due to a trouble in the respiratory system, the operation sound is radiated as much as possible to the surroundings. Needs to be smaller. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a solenoid valve for an adsorption-type oxygen concentrator capable of reducing operating noise radiated to the surroundings.

[0014]

According to the present invention, a pair of valve seats provided opposite each other in a valve chamber, a common port communicating with the valve chamber between the two valve seats, and a valve outside the both valve seats are provided. In order to achieve the above object, in a solenoid valve for an adsorption-type oxygen concentrator having a pair of selection ports communicating with a chamber and a valve element selectively contacting both valve seats with an electromagnetic actuator, the following is provided. Take steps.

That is, a means is provided such that when the valve is displaced by a predetermined amount or more from the center between the two valve seats to any one of the valve seats, the other valve seat is opened.

[0016]

When 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, if the center between the two valve seats is approached by a predetermined amount or more, one valve seat remains closed. The other valve seat is closed, and when the valve passes through the center between the two valve seats and approaches the other valve seat by a predetermined amount or more, one valve seat is opened.

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

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A solenoid valve for an adsorption-type oxygen concentrator according to one embodiment of the present invention will be specifically described with reference to the drawings. This solenoid valve 2 is, as shown in each sectional view of FIGS. 2 and 3,
A body 21 and two solenoids 22 are provided. Two valve chambers 23 are formed in the body 21 so as to be coaxial with the respective solenoids 22.

In each of the valve chambers 23, a pair of valve seats 24 which are opposed to each other in the axial direction are provided, and a valve 25 which advances and retreats between the two valve seats 24 is inserted. Also, in the body 21,
A common port communicating with the portion 23a of each valve chamber 23 between both valve seats 24
26 (26a, 26b) and a part of each valve chamber 23 outside both valve seats 24
A pair of selection ports 27, 28 communicating with 23b, 23c are formed.

As shown in FIG. 2, one of the selection ports 27 and 28 (here, the selection port 27) is individually connected to the room, and the other (here, the selection port 28) is assembled with each other. Connected to the adsorption tank 3. The common port 26a of 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.

On both sides of the valve chamber 23 in the axial direction, the valve chamber 23
A guide hole 29 is formed coaxially with the guide hole 29, and a stem 30 extending from both ends of the valve 25 is slidably fitted in the guide hole 29, whereby the advance / retreat of the valve 23 is guided. You. The solenoid 22 is fixed to one end surface of the body 21, and its output shaft 31 protrudes into one end of the stem 30 in the body 21 so as to be able to advance and retreat. A biasing return spring 32 is provided. An output shaft 31 is provided between the stem 30 and the output shaft 31 of the solenoid 22.
A pressing spring 33 for transmitting the above operation to the stem 30 is inserted.

As shown in the enlarged sectional view of FIG. 1, on both sides of the valve 25, a poppet valve seat 34 which is received by each valve seat 24, and protrudes from the outer end face of the poppet valve seat 34, and Spool 36 inserted into and removed from valve hole 35 inside 24
Are provided. The poppet valve seat 34 and the spool portion 36 are formed as an integral body made of an elastic body such as rubber. The two spool portions 36 are formed so as to protrude into the valve hole 35 in a sealing manner over a predetermined overlapping dimension when the valve element is positioned at the center between the two valve seats.

In the adsorption mode, as shown in FIG. 2, the solenoid valve 2 is connected to a common port 26a connected to a suction passage 1a of the air compressor 1 to a selection port 27 which communicates with a room. The common port 26b connected to the first discharge path 1b is connected to the suction tank 3 via the selection port 28. In the exhaust mode, as shown in FIG. 3, a common port 26a connected to the suction passage 1a of the air compressor 1 is provided.
Are connected to the adsorption tank 3 through the selection port 28, and are connected to the common port 25b connected to the discharge path 1b of the air compressor 1.
Is connected to a selection port 27 communicating with the room.

In the transition period from the adsorption mode to the exhaust mode, as shown in FIG.
When the poppet valve seat 34 is received, the poppet valve seat 34 is moved from the state where the valve seat 24 is closed to the direction where the other valve seat 34 is closed. In this transition period, in the valve chamber 23 to which the discharge passage 1b of the air compressor 1 is connected, when the valve 25 approaches the center of the two valve seats 24 from the valve seat 24 on the selection port 27 side by a predetermined amount or more,
The valve hole 35 of the valve seat 24 on the selection port 27 side is
6, the spool portion 36 on the opposite side is connected to the other valve seat 24, that is, the valve hole 3 on the selection port 28 side.
Enter 5 and close it. When the valve element 25 further passes through the center between the two valve seats 24 and approaches the valve seat 24 on the selection port 28 side by a predetermined amount or more, the spool portion 36 on the selection port 27 side rotates the valve seat on the selection port 27 side. 24 valve holes 35
And the valve seat 24 is opened.

That is, there is provided a timing 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 thereafter, , Since it is switched to the selection port 27 side communicating with the room, the impact sound at the time of switching is, for example, about 10 dB.
And the maximum value of the operating noise could be suppressed to 72 dB or less, and the average value could be suppressed to about 24 dB.

The measurement of the operating noise in the conventional example and the above-described embodiment is performed by using an internal pressure of 0.2 MPa instead of the adsorption tank 3.
a, Connect a 7-liter dummy tank,
Measured using a normal sound level meter according to JISC1502 standard at a distance of 50 cm from

[0027]

As described above, the present invention relates to a poppet seal type solenoid valve for an adsorption-type oxygen concentrator.
When the valve is displaced by a predetermined amount or more from the center between the two valve seats to an arbitrary one of the valve seats, the other valve seat is opened. When the selection port connected to is switched, the high pressure air can be blocked in the valve chamber by once blocking the discharge path from both the selection ports, thereby reducing the impact sound accompanying the switching of the valve, Driving noise can be reduced.

[Brief description of the drawings]

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

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

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

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 sectional view of a conventional example of a metal spool type.

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

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

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-246366 (JP, A) JP-A-61-228172 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 11/07 A61M 16/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of valve seats provided in a valve chamber facing each other, a common port communicating between the two valve seats with the valve chamber, and a pair forming a pair communicating with the valve chamber outside the both valve seats. In a solenoid valve for an adsorption-type oxygen concentrator having a port and a valve selectively contacting both valve seats by an electromagnetic actuator, a poppet valve seat received by each valve seat is provided on both sides of the valve. A spool portion protruding from the outer end surface of the poppet valve seat and inserted into and removed from a valve hole in the valve seat is provided.
When the valve is positioned at the center between the two valve seats, the valve is formed so as to protrude into the valve hole in a sealing manner over a predetermined overlapping dimension. A solenoid valve for an adsorption-type oxygen concentrator, characterized in that the other valve seat is opened when displaced by a predetermined amount or more.