JP2012085956A - Suction/discharge switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a device by enabling suction/discharge to be switched by one operation.SOLUTION: This suction/discharge switching valve switches suction/discharge by a pump driven by a motor and includes a suction section being one side of a body and a discharge section being the other side. The suction section includes a suction path connecting the pump and a suction port together and an invalid suction path to be used corresponding the time of suction. The suction path is divided into a first suction path 4a being the pump side and a second suction path being the suction port side via a suction side switching chamber. The first and second suction paths and the invalid path open to the suction side switching chamber and a switching plate 10 is abutted on the opening ends. The discharge section includes a discharge path connecting the discharge path and the pump together and the invalid discharge path to be used corresponding the time of suction. The discharge path is divided into a first discharge path 7a being the pump side and a second discharge path being the discharge port side via the discharge side switching chamber. The first and second paths and the invalid discharge path are opened to the discharge side switching chamber and the switching plate 10 is abutted on the opening end.

Description

    The present invention relates to a switching valve for switching suction and discharge by a pump driven by a single motor, and is particularly suitable for use in a medical suction / discharge (nebulizer) combined machine. .

In a suction / discharge combination machine for medical use, there is a possibility that various germs may be mixed in by suction, and since it is necessary to completely eliminate germs in the discharge, an air circuit for suction and an air circuit for discharge Must be completely separated.
To solve this problem, the invention of Japanese Patent No. 4049420 has been proposed.
Japanese Patent No. 4049420

The invention disclosed in Patent Document 1 is for switching a circuit between a switching valve unit that selectively opens either a positive pressure connection port or a negative pressure connection port for switching between suction and discharge, and a pump therefor. These two pipe line switching units are configured to switch between suction and discharge by interlocking them.
In the present invention, two units of a switching valve unit and a pipeline switching unit are provided, and the configuration is complicated.

  It is an object of the present invention to simplify the apparatus by switching between suction and discharge by a single operation.

The switching valve of the present invention is a switching valve for switching suction and discharge by a pump driven by a single motor, and has one side as a suction section and the other side as a discharge section.
The pump is provided with a suction pump and a discharge pump in one motor, and both the suction pump and the discharge pump are in operation when the motor is driven.

The suction section includes a suction path connecting the pump and the suction port, and an invalid suction path corresponding to the time of suction. The suction path is divided into a first suction path on the pump side and a second suction path on the suction port side through a suction side switching chamber, and the first and second suction paths and the invalid suction path are the suction side switching chamber. The switching plate is disposed in contact with the opening ends of the three suction paths.
The suction port is a connection port to a suction bottle or the like, and is open to the outer surface of the body. Since the suction pump is operated even during the discharge operation as described above, the invalid suction path is for supplying air necessary for the pump to the pump, and is invalid because it does not contribute to the suction function. This is called the suction path.

The discharge section includes a discharge path connecting the discharge port and the pump, and an invalid discharge path corresponding to suction, and the discharge path is connected to the first discharge path and the discharge port side on the pump side via a discharge side switching chamber. The first and second discharge paths and the ineffective discharge path are opened in the same plane in the discharge side switching chamber, and a switching plate is brought into contact with the opening ends of the three discharge paths. Are arranged.
The discharge port is a connection port to a nebulizer or the like, and is open to the outer surface of the body. Since the discharge pump is operating even during the suction operation as described above, the invalid discharge path is for evacuating air in order to cope with it, so it is called an invalid discharge path because it does not contribute to the discharge function. Yes.

The two switching chambers on the suction side and the discharge side are gaps between the outer surface of the switching plate and the inner wall of the body end surface. The switching plate is rotatable and is provided with two through holes. The positional relationship between the through hole position of each section switching plate and each open end is as follows.
In the suction section, at the time of suction operation, a through hole of the switching plate is located at the opening end of the first and second suction passages, and the two suction passages communicate with each other via the suction side switching chamber, and the discharge operation is performed. Sometimes a through hole of the switching plate is located at the opening end of the first suction path and the ineffective suction path so that the two suction paths communicate with each other through the switching chamber.
In the discharge section, at the time of the discharge operation, a through hole of the switching plate is located at the opening end of the first and second discharge passages, and the two discharge passages communicate with each other via the discharge side switching chamber. Sometimes a through hole of the switching plate is positioned at the opening end of the first discharge path and the invalid discharge path so that the two discharge paths communicate with each other through the gap.

  At the time of the suction, the rotation of the two switching plates corresponding to the discharge is interlocked. As an interlocking method, an electrical method can be adopted.

  The invention according to claim 2 is such that the switching plate of the suction section and the switching plate of the discharge section are connected by a single shaft, and a switching operation handle is attached to one end thereof. An O-ring is attached to the shaft, and the space between the shaft and the shaft passage hole formed in the partition is kept airtight.

According to the present invention, the suction-side flow path and the discharge-side flow path are completely separated by using one side of the body as a suction section and the other side as a discharge section. There is no risk of contamination on the discharge side. In particular, in the invention of claim 3, although the shaft communicates with the suction side and the discharge side, an O-ring is attached to the shaft connecting the two switching plates, so that the air on the suction side passes through the shaft insertion hole. There is no risk of mixing with air on the discharge side.
According to this invention, the flow path switching on each of the suction side and the discharge side is performed by the rotation of the switching plate. Since both switching plates are interlocked, the operation of the two switching plates can be performed by a single operation. As a result, switching between suction and discharge can be performed only by rotating the switching plate.
In addition, the main constituent members of the present invention are only a body having a predetermined flow path and a switching plate incorporated therein, and the structure is very simple.

FIG. 1 is a circuit diagram showing a use state of a device in which a valve of the present invention is incorporated.
The valve A of the present invention is a portion surrounded by an alternate long and short dash line, and the medical suction / discharge device B into which the valve of the present invention is incorporated is a portion surrounded by a dotted line. Reference numeral C is a suction bottle, D is a suction object, and E is a nebulizer.
At the time of suction, the motor 50 is driven and both the suction pump 51 and the discharge pump 52 are operated. The air flow necessary for suction is indicated by arrows a1 and a2. On the other hand, the flow of air necessary for discharge is the flow of arrows b1 and b2.
Therefore, in the valve A, it is necessary to block the flow of the arrows b1 and b2 during suction and to block the flow of the arrows a1 and a2 during discharge. In addition, the discharge flow a3 generated from the discharge pump 52 during suction must be released, and the suction flow b3 generated from the suction pump 51 must be ensured during discharge.
That is, in the valve, it is necessary to form a flow path so as to ensure the airflow indicated by arrows a1, a2, and a3 during suction and to ensure the airflow indicated by arrows b1, b2, and b3 during discharge.

In the suction section formed on one side of the body, the suction side switching chamber 3 includes a first suction path (arrow a1) connected to the pump during suction operation and a second suction path (arrow a2) connected to the suction port. The suction hole is located at the opening end, and the two suction passages communicate with each other via the suction-side switching chamber 3. During the discharge operation, the first suction passage a1 and the invalid suction passage (arrow a3) The through hole of the switching plate is positioned at the open end of the two) so that the two suction paths communicate with each other through the suction side switching chamber 3.
On the other hand, the discharge section separated from the suction section discharges the first discharge path (arrow b1) connected to the pump during discharge operation and the second discharge path (arrow b2) connected to the discharge port. The opening is opened in the side switching chamber 3a, the through hole of the switching plate is positioned at the opening end, and the two discharge passages communicate with each other through the discharge side switching chamber 3a. During the suction operation, the first discharge passage b1 and the invalid discharge passage A through hole of the switching plate is located at the opening end of b3 so that the two discharge paths communicate with each other through the discharge side switching chamber 3a.
By linking the rotation of the two switching plates, an optimum flow path can be obtained in one operation for both suction and discharge.
Examples of the present invention will be described below.

The body 1 has a cylindrical shape, and gaps are formed at both end portions and caps 2 are attached. The body 1 has a suction section on one side and a discharge section on the other side, and a gap is a switching chamber 3.3a.
The suction section includes a first suction path 4a connecting the suction pump 51 and the suction side switching chamber 3 and a second suction path connecting the suction port 5 and the suction side switching chamber 3 in the solid portion 1a of the cylindrical body. 4b and an invalid suction path 6 corresponding to the time of inhalation, and the first suction path 4a and the second suction path 4b constitute the suction path 4.
The first and second suction paths 4a, 4b and the invalid suction path 6 are opened at the end face of the solid portion 1a, and the openings are clockwise in order of the invalid suction path 6, the first suction path 4a, and the second suction path 4b. They are arranged at intervals of 90 degrees.

The discharge section includes a first discharge path 7a connecting the discharge pump 52 and the discharge side switching chamber 3a, and a second discharge connecting the discharge port 8 and the discharge side switching chamber 3a in the solid portion 1a of the cylindrical body. A path 7b and an invalid suction path 9 corresponding to the time of inhalation are provided, and the first discharge path 7a and the second discharge path 7b constitute the suction path 7.
The first and second discharge passages 7a and 7b and the invalid discharge passage 9 are opened at the end face of the solid portion 1a, and the openings are clockwise in order of the invalid discharge passage 9, the first discharge passage 7a, and the second discharge passage 7b. They are arranged at intervals of 90 degrees.

The switching plates 10 and 10a are rotatably disposed in contact with the outer surface of the solid portion 1a of the body 1, and two through holes 11 and 12 are provided in the switching plates 10 and 10a, respectively.
In the suction section, the through holes 11 and 12 of the switching plate 10 are positioned at the opening ends of the first and second suction paths 4a and 4b in the suction section, so that the suction side switching chamber 3 is located in the suction section. The through holes 11 and 12 of the switching plate 10 are located at the opening ends of the first suction path 4a and the invalid suction path 6 during the discharge operation, and the suction side switching chamber is interposed through the suction side switching chamber. The two suction paths communicate with each other.
In the discharge section, at the time of discharge operation, the through holes 11 and 12 of the switching plate 10a are located at the opening ends of the first and second discharge passages 7a and 7b, and two holes are disposed via the discharge side switching chamber 3a. The discharge passages communicate with each other, and the through holes 11 and 12 of the switching plate 10a are located at the opening ends of the first discharge passage 7a and the invalid discharge passage 9 during the suction operation, and two discharges are made via the discharge-side switching chamber 3a. Make sure the road is in communication.

Then, the two switching plates 10 and 10a are connected by a shaft 13, and an O-ring 14 for fitting an airtight space between the shaft 13 and a through hole for inserting the shaft formed in the solid portion 1a is fitted. is there.
An operating handle 15 is attached to the shaft, and an indication that the operation is switched is displayed near the handle.

According to this embodiment, when the handle is set to the suction side, the switching plate is in the state shown in FIGS. Accordingly, since the through holes 11 and 12 of the switching plate 10 are located at the positions corresponding to the open ends of the suction path 4a and the suction path 4b, the suction path 4a and the suction path 4b communicate with each other via the switching chamber 3, and the suction pump The intake air from the air reaches the suction port 5 through the suction path 4a and the suction path 4b, and can apply a negative pressure to the suction bottle C.
At this time, since the circuit connected to the discharge port 8 is closed in the discharge section, the discharge action is not performed. On the other hand, the positive pressure generated in the discharge pump 52 is such that the switching plate 10a of the discharge section aligns the through holes only in the flow path 7a and the invalid discharge path 9 from the discharge pump. Then, it is discharged through the invalid discharge path 9.

At the time of discharge operation, when the handle is set to discharge, the switching plate is in the state shown in FIGS. Accordingly, since the through holes 11 and 12 of the switching plate 10a are in a position aligned with the open ends of the discharge path 7a and the discharge path 7b, the discharge path 7a and the discharge path 7b communicate with each other via the switching chamber 3a. The gas discharged from the gas reaches the discharge port 8 via the first discharge path 7a and the second discharge path 7b, and is supplied to the nebulizer.
At this time, since the circuit connected to the suction port is closed in the suction section, no suction action is performed. On the other hand, the negative pressure generated by the suction pump 51 is such that the switching plate of the suction section is aligned with the through holes only in the first suction path 4a and the invalid suction path 6 from the suction pump. It is discharged through an ineffective suction path.

According to this invention, since the two switching plates arranged in the suction section and the discharge section are interlocked, suction and discharge can be switched with one operation. Since the suction flow path and the discharge flow path are completely separated, the sanitary problem is also solved.
Therefore, the present invention is industrially effective as a switching valve incorporated in a suction / discharge combined machine having a simple structure.

Working principle diagram showing the outline of the present invention The perspective view of the state which removed the cap of the Example Example of longitudinal section Cross-sectional view of the embodiment Explanatory drawing which shows the state of the suction section at the time of suction Explanatory drawing which shows the state of the discharge section at the time of suction Explanatory drawing which shows the state of the suction section at the time of discharge Explanatory drawing which shows the state of the discharge section at the time of discharge

1 Body
2 Cap 3, 3a Switching chamber 4 Suction path 5 Suction port 6 Invalid suction path 7 Discharge path 8 Discharge port 9 Invalid discharge path 10, 10a Switching plate 11, 12 Through hole 13 Shaft 14 O-ring

Claims (3)

In a switching valve for switching suction and discharge by a pump driven by one motor,
One side of the body is the suction section and the other side is the discharge section.
The suction section includes a suction path connecting the pump and the suction port, and an invalid suction path corresponding to the time of suction, and the suction path is provided between the first suction path on the pump side and the suction port side via the suction side switching chamber. Divided into second suction paths, the first and second suction paths and the invalid suction path are opened in the same plane in the suction side switching chamber, and a switching plate is disposed in contact with the open ends of the three suction paths. Established,
The discharge section includes a discharge path connecting a pump and a discharge port, and an invalid discharge path corresponding to suction, and the discharge path is connected to a first discharge path on the pump side and a discharge port side via a discharge side switching chamber. The first and second discharge paths and the invalid discharge path are opened in the same plane in the discharge-side switching chamber, and a switching plate is disposed in contact with the opening ends of the three discharge paths. Established,
The two switching chambers are gaps between the outer surface of the switching plate and the inner wall of the end surface of the body,
Both the switching plates are rotatable, each provided with two through holes, and the positional relationship between the through holes and the respective open ends is
In the suction section, at the time of suction operation, a through hole of the switching plate is located at the opening end of the first and second suction passages, and the two suction passages communicate with each other via the suction side switching chamber, and the discharge operation is performed. Sometimes the opening of the first suction path and the invalid suction path has a through hole in the switching plate, and the two suction paths communicate with each other via the suction side switching chamber,
In the discharge section, at the time of the discharge operation, a through hole of the switching plate is located at the opening end of the first and second discharge passages, and the two discharge passages communicate with each other via the discharge side switching chamber. Sometimes the through hole of the switching plate is located at the opening end of the first discharge path and the invalid discharge path, and the two discharge paths communicate with each other through the discharge side switching chamber,
A suction / discharge switching valve adapted to interlock the rotation of the two switching plates. The suction / discharge switching valve according to claim 1, wherein the switching plate of the suction section and the switching plate of the discharge section are connected by a single shaft so that the rotation of the two switching plates is interlocked. The suction / discharge switching valve according to claim 2, wherein an O-ring is attached to the shaft, and the space between the shaft and a shaft passage hole formed in the partition wall is kept airtight.

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