JP2022074857A - Flow path switching mechanism and air pump - Google Patents

Abstract

To provide a flow path switching mechanism enabling simple switching operation, and capable of suppressing intrusion of foreign matter.SOLUTION: A flow path switching mechanism 10 has an operating member 11 comprising a valve body 11a, and a housing 12 comprising a valve chamber 12a that houses the valve body 11a so that it can move forward and backward between a pressurizing position and a depressurizing position. The valve chamber 12a has an exhaust port 12b, an outflow port 12c, a connection port 12d, an inflow port 12e, and an intake port 12f. The valve body 11a is configured to communicate the intake port 12f with the inflow port 12e and the outflow port 12c with the connection port 12d at the pressurizing position, while communicating the connection port 12d with the inflow port 12e and the outflow port 12c with the exhaust port 12b at the depressurizing position. A filter member is provided upstream of the intake port 12f or at the intake port 12f.SELECTED DRAWING: Figure 9

Description

The present disclosure relates to a flow path switching mechanism and an air pump.

A flow path switching mechanism of an air pump used for calibration of a pressure device or the like is known (see, for example, Non-Patent Document 1). The flow path switching mechanism includes an operating member including a valve body and a housing including a valve chamber for accommodating the valve body so as to be able to advance and retreat between a pressurizing position and a depressurizing position. The valve chamber has an exhaust port, an outlet arranged in front of the exhaust port in the direction from the pressurizing position to the depressurizing position, a connection port arranged in front of the outlet, and a front of the connection port. It has an inlet arranged in and an intake port arranged in front of the inlet. The valve body is configured so that the intake port communicates with the inlet and the outlet communicates with the connection port at the pressurization position, while the connection port communicates with the inlet and the outlet communicates with the exhaust port at the decompression position. Will be done.

Druck PV211 --Pneumatic pressure and vacuum pump, GE Industrial Sensing

In the conventional flow path switching mechanism, a rod-shaped tool is inserted into the exhaust passage forming the exhaust port and the operating member is pushed forward to move the operating member from the pressurizing position to the depressurizing position, while forming an intake port. By inserting a rod-shaped tool into the intake passage and pushing the operating member backward, the operating member is configured to move from the decompression position to the pressurization position. Therefore, the operating member unintentionally moves from the pressurized position to the depressurized position due to an erroneous operation or the like, and as a result, the occurrence of problems such as the generation of the exhaust sound of the pressurized air and the surprise of the user is suppressed. ing.

However, since a tool is required to switch the flow path, the switching operation is troublesome. In addition, there is a risk that foreign matter may enter the valve chamber through the intake port.

An object of the present disclosure is to provide a flow path switching mechanism and an air pump capable of a simple switching operation and suppressing the intrusion of foreign matter.

The flow path switching mechanism according to some embodiments includes an actuating member comprising a valve body and a housing including a valve chamber for accommodating the valve body so as to be able to advance and retreat between a pressurizing position and a depressurizing position. , The valve chamber is an exhaust port, an outlet arranged in front of the exhaust port in the direction from the pressurizing position to the depressurizing position, and a connection port arranged in front of the outlet. The valve body has an inlet arranged in front of the connection port and an intake port arranged in front of the inlet, and the valve body holds the intake port in the pressurizing position. It is configured to communicate with the inlet and the outlet with the connection port, while at the decompression position the connection port communicates with the inlet and the outlet communicates with the exhaust port. The actuating member has a screwed portion screwed into the housing at least at the pressurized position, and an operated portion connected to the rear end of the valve body and exposed from the housing, upstream of the intake port or upstream of the intake port. A filter member is provided at the intake port. According to such a configuration, by operating the operated portion, the screwed portion is rotated in the first rotation direction with respect to the housing, whereby the operating member can be moved from the pressurizing position to the depressurizing position. In addition, by operating the operated portion, the screwed portion is rotated in the second rotation direction, which is the opposite direction of the first rotation direction with respect to the housing, whereby the operating member is moved from the decompression position to the pressurization position. Can be made to. Therefore, it is possible to prevent the operating member from unintentionally moving from the pressurizing position to the depressurizing position due to an erroneous operation or the like. Further, it is not necessary to use a tool for switching the flow path, which enables a simple switching operation. Further, the filter member can prevent foreign matter from entering the valve chamber through the intake port.

In one embodiment, the filter member is arranged in an intake passage having the intake port as a downstream end. According to such a configuration, damage to the filter member due to contact with the outside can be suppressed.

In one embodiment, the screwed portion is screwed into the housing over the entire stroke between the pressurized position and the depressurized position. According to such a configuration, it is possible to prevent the operating member from unintentionally moving between the pressurizing position and the depressurizing position due to an erroneous operation or the like.

In one embodiment, the threaded portion is screwed into the housing only in the pressurized position. According to such a configuration, the switching operation can be easily performed with a small amount of rotation operation.

In one embodiment, the operated portion is a knob. With such a configuration, it is possible to easily operate the operated portion.

The air pump according to some embodiments has the flow path switching mechanism and a pressure chamber that communicates with the inlet and outlet, respectively, and is driven to increase or decrease the volume. With such a configuration, a simple switching operation can be performed and the intrusion of foreign matter can be suppressed.

In one embodiment, the pressure chamber is manually driven. According to such a configuration, the pressure chamber can be easily driven.

In one embodiment, the pressure chamber is driven by gripping the handgrip against the urging force of the spring. According to such a configuration, the driving operation for driving the pressure chamber can be easily performed.

In one embodiment, the air pump opens and closes a vent port and a vent port that communicates with the connection port of the flow path switching mechanism regardless of whether the operating member is in the pressurizing position or the depressurizing position. It has a possible opening / closing member. According to such a configuration, the positive pressure or the negative pressure applied to the internal space of the object by the air pump can be weakened and eliminated by opening the vent port by the opening / closing member.

According to the present disclosure, it is possible to provide a flow path switching mechanism and an air pump capable of a simple switching operation and suppressing the intrusion of foreign matter.

It is an external view which shows the air pump which has the flow path switching mechanism which concerns on a comparative example. It is a partially enlarged view of FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2, showing a state when the operating member is in the pressurized position. It is sectional drawing which shows the state when the actuating member moves from the state shown in FIG. 3 to the decompression position. It is a partial cross-sectional plan view of the drive mechanism shown in FIG. 1, and shows the state before the pressing operation. It is a partial sectional plan view which shows the state when the pressing operation is completed from the state shown in FIG. It is sectional drawing of the vent mechanism shown in FIG. 1, and shows the state when the vent opening is opened. It is sectional drawing which shows the state when the vent opening is closed from the state shown in FIG. 7. It is sectional drawing which shows the flow path switching mechanism which concerns on 1st Embodiment, and shows the state when the operating member is in a pressurizing position. It is sectional drawing which shows the state when the actuating member moves from the state shown in FIG. 9 to the decompression position. It is sectional drawing which shows the flow path switching mechanism which concerns on 2nd Embodiment, and shows the state when the operating member is in a pressurizing position. FIG. 11 is a cross-sectional view showing a state when the operating member moves toward the decompression position from the state shown in FIG. 11 and the screwed portion is screwed out from the housing. It is sectional drawing which shows the state when the actuating member moves from the state shown in FIG. 12 to the decompression position.

Hereinafter, embodiments according to the present disclosure will be illustrated in detail with reference to the drawings. In each figure, the corresponding elements are designated by the same reference numerals.

First, a comparative example will be illustrated. The flow path switching mechanism 10 according to the comparative example shown in FIG. 1 is a mechanism for switching the flow path of the manual air pump 1. The air pump 1 has a flow path switching mechanism 10, a drive mechanism 20, and a vent mechanism 30.

As shown in FIGS. 1 to 4, the flow path switching mechanism 10 places the valve body 11a between the pressurizing position (see FIG. 3) and the depressurizing position (see FIG. 4) between the operating member 11 including the valve body 11a. It has a housing 12 and a valve chamber 12a for accommodating the valve chamber 12a so as to be able to move forward and backward. The valve chamber 12a has an exhaust port 12b and a flow path switching mechanism in the direction from the pressurizing position to the depressurizing position in front of the exhaust port 12b (that is, for convenience of explanation, the direction from the pressurizing position to the depressurizing position). From the inflow port 12c arranged in front of the outlet 12c, the connection port 12d arranged in front of the outflow port 12c, the inflow port 12e arranged in front of the connection port 12d, and the inflow port 12e. Also has an intake port 12f, which is arranged forward. In the valve body 11a, the intake port 12f is communicated with the inlet 12e and the outlet 12c is communicated with the connection port 12d at the pressurized position, while the connection port 12d is communicated with the inlet 12e and the outlet 12c is communicated at the depressurized position. It is configured to communicate with the exhaust port 12b.

The housing 12 has a valve chamber 12a having a cylindrical inner peripheral surface centered on a first central axis O1 extending in the front-rear direction. An intake port 12f is provided at the front end of the valve chamber 12a. The intake port 12f is a rear end (downstream end) of the intake passage 12g extending in the front-rear direction. The front end (upstream end) of the intake passage 12g is open to the external space S. An exhaust port 12b is provided at the rear end of the valve chamber 12a. The exhaust port 12b is a front end (upstream end) of the exhaust passage 12h extending in the front-rear direction. The rear end (downstream end) of the exhaust passage 12h is open to the external space S. An inflow port 12e, a connection port 12d, and an outflow port 12c are provided on the inner peripheral surface of the valve chamber 12a. The inflow port 12e is a radial inner end of the inflow path 12i extending in the radial direction. The connection port 12d is a radial inner end of the connection path 12j extending in the radial direction. The outlet 12c is the radial inner end of the outflow path 12k extending radially.

The housing 12 has a housing body 12l, a first end member 12m, and a second end member 12n. The housing body 12l has an intermediate portion in the front-rear direction of the valve chamber 12a, an inflow path 12i, a connection path 12j, and an outflow path 12k. The first end member 12m has a front end of the valve chamber 12a and an intake passage 12g. The second end member 12n has a rear end of the valve chamber 12a and an exhaust passage 12h. The first end member 12m and the second end member 12n are each integrally connected to the housing body 12l by means such as fitting, screw coupling, or welding.

The valve body 11a is provided with an annular first sealing portion 11b in close contact with the inner peripheral surface of the valve chamber 12a and a second sealing portion 11b provided behind the first sealing portion 11b and in close contact with the inner peripheral surface of the valve chamber 12a. It has a sealing portion 11c and. The first sealing portion 11b and the second sealing portion 11c are each formed of an annular elastic member integrally connected to the valve body 11d.

The actuating member 11 has a front shaft member 11e integrally connected to the front end of the valve body 11a, and a rear shaft member 11f integrally connected to the rear end of the valve body 11a. The front shaft member 11e and the rear shaft member 11f each extend in the front-rear direction. The front shaft member 11e can move forward and backward within the intake passage 12g by moving forward and backward of the operating member 11. The rear shaft member 11f can move forward and backward in the exhaust passage 12h by moving forward and backward of the operating member 11.

When the actuating member 11 is in the pressurizing position (see FIG. 3), the first sealing portion 11b is arranged behind the inflow port 12e and in front of the connecting port 12d, and the second sealing portion 11c is at the flow position. It is arranged at a position behind the outlet 12c and ahead of the exhaust passage 12h. When the actuating member 11 is in the decompression position (see FIG. 4), the first sealing portion 11b is arranged behind the intake port 12f and in front of the inflow port 12e, and the second sealing portion 11c is a connecting port. It is located behind 12d and in front of the outlet 12c.

By inserting a rod-shaped tool into the exhaust passage 12h and pushing the rear shaft member 11f of the operating member 11 forward, the operating member 11 can be moved from the pressurizing position to the depressurizing position. Further, by inserting a rod-shaped tool into the intake passage 12g and pushing the front shaft member 11e of the operating member 11 backward, the operating member 11 can be moved from the decompression position to the pressurization position.

By moving the operating member 11 to the pressurizing position, the operating specifications of the air pump 1 can be set to the pressurizing specifications. Further, by moving the operating member 11 to the decompression position, the operation specification of the air pump 1 can be set to the decompression specification.

As shown in FIGS. 5 to 6, the drive mechanism 20 includes a handgrip mechanism 20a. The handgrip mechanism 20a is a spring 23 (that is, a spring 23) that gives a first member 21, a second member 22 that is vertically connected to the first member 21, and a urging force that lowers the second member 22 to the first member 21. , The direction of the urging force applied by the spring 23 is defined as downward in the hand grip mechanism 20a), and the hand grip 24 composed of two grip links 24a. Each grip link 24a includes a grip 24b rotatably connected to the first member 21 and a link 24d rotatably connected to the second member 22 below the connecting portion 24c between the first member 21 and the grip 24b. , A connecting shaft 24f that rotatably connects the grip 24b and the link 24d below the connecting portion 24e between the second member 22 and the link 24d. The drive mechanism 20 has a pressure chamber 25 that communicates with the inlet 12e and the outlet 12c and is driven so as to increase or decrease the volume. The pressure chamber 25 is formed by the first member 21 and the second member 22.

The first member 21 is composed of a cylinder 21a and a bottom member 21b. In each grip link 24a, the upper end of the grip 24b is rotatably connected to the bottom member 21b via the connecting portion 24c.

The second member 22 is composed of a piston 22a and a central shaft member 22b. The central axis member 22b has a second central axis line O2 extending along the vertical direction. The second central axis O2 is perpendicular to the first central axis O1. A piston 22a is integrally connected to the upper end of the central shaft member 22b. In each grip link 24a, the upper end of the link 24d is rotatably connected to the lower end of the central shaft member 22b via the connecting portion 24e.

The cylinder 21a has a top wall 21e having an inlet hole 21c communicating with the inflow port 12e and an outlet hole 21d communicating with the outlet 12c, and a peripheral wall 21f hanging from the top wall 21e. A bottom member 21b is integrally connected to the lower end of the peripheral wall 21f. The bottom member 21b has a through hole through which the central shaft member 22b penetrates. The lower portion of the central shaft member 22b has a stepped portion 22c whose diameter expands downward, and a coiled spring 23 is arranged coaxially with the second central shaft line O2 between the stepped portion 22c and the bottom member 21b. To.

The piston 22a can slide in the vertical direction on the inner peripheral surface of the peripheral wall 21f of the cylinder 21a. The pressure chamber 25 is formed by a cylinder 21a (a lower surface of the top wall 21e and an inner peripheral surface of the peripheral wall 21f) and a piston 22a. Therefore, the pressure chamber 25 communicates with the inflow port 12e and the outflow port 12c, respectively, and is driven by the handgrip mechanism 20a so as to increase or decrease the volume.

The two grip links 24a face each other with the second central axis O2 interposed therebetween, and have a substantially symmetrical structure with the second central axis O2 interposed therebetween. That is, the second central axis O2 is also the central axis of the handgrip 24. Each connecting portion 24c rotatably connects the grip 24b and the first member 21 around the rotation axis P. Each connecting portion 24e rotatably connects the second member 22 and the link 24d around the rotation axis Q. Each connecting shaft 24f rotatably connects the grip 24b and the link 24d around the rotation axis R. The rotation axis P, the rotation axis Q, and the rotation axis R are parallel to each other. Each rotation axis Q intersects the second central axis O2.

In each grip link 24a, the connecting portion 24c between the grip 24b and the first member 21 is composed of, for example, a rotating shaft fixed to the grip 24b, and the connecting portion 24e between the second member 22 and the link 24d is, for example. The connecting shaft 24f of the grip 24b and the link 24d is fixed to, for example, the grip 24b.

Therefore, by the pressing operation of gripping the hand grip 24 against the urging force of the spring 23, in each grip link 24a, the connecting shaft 24f (rotating axis R) at the lower end of the link 24d to the connecting portion 24e at the upper end of the link 24d. A pressing force Fa in the direction toward (rotation axis Q) is applied to the connecting portion 24e, and as a result, an upward resultant force F of these pressing forces Fa is applied to the second member 22, whereby the second member 22 is first. The volume of the pressure chamber 25 can be reduced by raising it with respect to the member 21. Further, by releasing the pressing operation, the urging force of the spring 23 can lower the second member 22 with respect to the first member 21 to increase the volume of the pressure chamber 25.

In this way, the pressure chamber 25 manually, more specifically, by gripping the hand grip 24 against the urging force of the spring 23, and more specifically, by resisting the urging force of the spring 23. By performing a driving operation including a pressing operation for grasping the hand grip 24 and a release of the pressing operation, the hand grip 24 is driven so as to increase or decrease the volume.

The air pump 1 allows air to flow in from the inflow port 12e into the pressure chamber 25, while the air is provided with a first check valve (not shown) that prevents air from flowing out from the pressure chamber 25 to the inflow port 12e. It has a second check valve (not shown) that allows air to flow out of the pressure chamber 25 to the outlet 12c while preventing air from flowing into the pressure chamber 25 from the outlet 12c. The first check valve is provided, for example, between the inflow path 12i and the inlet hole 21c. The second check valve is provided, for example, between the outflow passage 12k and the outlet hole 21d.

As shown in FIGS. 7 to 8, the vent mechanism 30 communicates with the connection port 12d of the flow path switching mechanism 10 regardless of whether the operating member 11 is in the pressurizing position or the depressurizing position, and the vent. It has an opening / closing member 32 that can open / close the mouth 31.

The vent port 31 is formed by a sealing member 34 held by the block 33. The opening / closing member 32 opens / closes the vent port 31 by being close to / separated from the sealing member 34.

The opening / closing member 32 can move forward and backward between the open position where the vent opening 31 is opened (see FIG. 7) and the closed position where the vent opening 31 is closed (see FIG. 8). Further, the opening / closing member 32 is from the first screwed portion 32a, which is a screwed portion screwed to the block 33 over the entire stroke between the open position and the closed position, and the open position of the first screwed portion 32a. The end of the front (that is, the direction from the open to the closed position is defined as the front in the vent mechanism 30) in the direction toward the closed position (that is, the front end of the first screwed portion 32a). It has a shaft body 32b that can move forward and backward together with the first screwed portion 32a. The first screwed portion 32a has a third central axis O3, and can move forward and backward along the third central axis O3 by rotating around the third central axis O3. The shaft body 32b opens the vent port 31 away from the sealing member 34 in the open position, and closes the vent port 31 in close contact with the sealing member 34 in the closed position.

The shaft body 32b is integrally connected to the first screwed portion 32a. The shaft body 32b may be configured to be connected to the first screwed portion 32a so as to be relatively rotatable around the third central axis O3.

The shaft body 32b has an equal-diameter portion 32c having a constant outer diameter, and a reduced-diameter portion 32d connected to the front end of the equal-diameter portion 32c and whose outer diameter decreases toward the front. The reduced diameter portion 32d constitutes the front end of the shaft body 32b. The sealing member 34 has an annular shape and is elastic. The shaft body 32b is brought into close contact with the sealing member 34 at the reduced diameter portion 32d by advancing the opening / closing member 32 from the open position to the closed position, thereby closing the vent port 31.

The opening / closing member 32 has a first operated portion 32e which is connected to the rear end of the first screwed portion 32a and is a rotatable operated portion together with the first screwed portion 32a. The first operated portion 32e is composed of a first knob 32f, which is a rotatable knob together with the first screwed portion 32a. The first operated portion 32e is connected to the rear end of the first screwed portion 32a via a shaft portion 32g having a diameter smaller than that of the first operated portion 32e.

The first operated portion 32e is integrally connected to the first screwed portion 32a. The first operated portion 32e may be connected to the first screwed portion 32a so as to be relatively movable in the front-rear direction.

The block 33 includes a holding cylinder 33b including a first screwed portion 33a to which the first screwed portion 32a is screwed, a first set screw 33c, a base member 33d, and a lid member 33e. , A cover member 33f and a washer 33g. The holding cylinder 33b has a cylindrical shape coaxial with the third central axis O3, and is provided with a first screwed portion 33a on the inner peripheral surface. The first set screw 33c has a cylindrical shape coaxial with the third central axis O3. The outer peripheral surface of the first set screw 33c is screwed to the tip of the inner peripheral surface of the holding cylinder 33b. A step portion 33h whose diameter is expanded toward the front is provided on the inner peripheral surface of the holding cylinder 33b, and the sealing member 34 is sandwiched between the step portion 33h and the rear end of the first set screw 33c.

The base member 33d has a storage recess 33i that accommodates the front end of the holding cylinder 33b, and a communication path 33j for communicating the vent port 31 with the connection port 12d of the flow path switching mechanism 10. The accommodating recess 33i is closed by an annular lid member 33e provided with a first through hole 33k, which is a through hole through which the holding cylinder 33b penetrates. The cover member 33f includes a second through hole 33l which is a through hole through which the holding cylinder 33b penetrates, and covers most of the base member 33d and the lid member 33e. The washer 33g has an annular shape including a third through hole 33m, which is a through hole through which the shaft portion 32g of the opening / closing member 32 penetrates, and is attached to the rear end surface of the holding cylinder 33b. The washer 33 g is made of, for example, a synthetic resin and has elasticity that can be compressed in the front-rear direction. The washer 33g is sandwiched between the front end surface of the first operated portion 32e and the rear end surface of the holding cylinder 33b in the closed position and compressed. The outer peripheral surface of the holding cylinder 33b is provided with a third sealing portion 33n, which is a sealing portion in close contact with the inner peripheral surface of the accommodating recess 33i. The third sealing portion 33n is composed of an annular elastic member integrally connected to the holding member main body 33o.

The first screwed portion 32a and the first screwed portion 33a are right-handed threads. However, the first screwed portion 32a and the first screwed portion 33a may be left-handed. The first screwed portion 32a is a male screw, and the first screwed portion 33a is a female screw. The thread shape of the male and female threads can be set as appropriate. The first screwed portion 32a and the first screwed portion 33a may be intermittent screws provided with threads intermittently.

When the opening / closing member 32 is in the open position, the vent port 31 is a gap between the opening / closing member 32 and the holding cylinder 33b including a gap (not shown) between the first screwed portion 32a and the first screwed portion 33a. It communicates with the external space S through the ventilation passage 35 composed of the above. A ventilation path for communicating the vent port 31 with the external space S when the opening / closing member 32 is in the open position may be provided in place of or in addition to the ventilation path 35.

The air pump 1 is used by connecting the connection path 12j to the end of the internal space of the object in order to pressurize or depressurize the internal space of the object (not shown).

In the pressurization specification setting state in which the operation specification is set to the pressurization specification, the air pump 1 drives the pressure chamber 25 by driving the drive mechanism 20 to drive the pressure chamber 25 from the external space S to the intake port 12f. Air can be sent to the internal space of the object through the inflow path 12i, the inlet hole 21c, the pressure chamber 25, the outlet hole 21d, the outflow path 12k and the connection path 12j in this order to pressurize the internal space of the object. .. Further, the air pump 1 is connected from the internal space of the object by driving the pressure chamber 25 by driving the drive mechanism 20 in the decompression specification setting state in which the operation specification is set to the decompression specification. Air can be sent to the external space S through the passage 12j, the inflow passage 12i, the inlet hole 21c, the pressure chamber 25, the outlet hole 21d, the outflow passage 12k and the exhaust port 12b in this order to reduce the pressure in the internal space of the object. ..

The positive pressure or negative pressure applied to the internal space of the object by the air pump 1 can be weakened and eliminated by operating the opening / closing member 32 of the vent mechanism 30 to open the vent port 31.

Further, the air pump 1 has an end portion of the internal space of the second pressure device, which is a pressure device such as a pressure gauge, which is a reference for calibrating the first pressure device, which is a pressure device such as a pressure gauge as an object. It has a calibration flow path (not shown) which is a flow path for connecting. The calibration flow path is provided so as to communicate with the connection port 12d of the flow path switching mechanism 10 regardless of whether the operating member 11 is in the pressurizing position or the depressurizing position.

When calibrating the first pressure device, the end of the internal space of the first pressure device is connected to the connection path 12j, and the end of the internal space of the second pressure device is connected to the calibration flow path. Therefore, the same positive pressure or negative pressure can be applied to the first pressure device and the second pressure device by the air pump 1 to calibrate the first pressure device.

As described above, in this comparative example, the flow path switching mechanism 10 pushes the rear shaft member 11f of the operating member 11 forward by inserting a rod-shaped tool into the exhaust passage 12h to press the operating member 11 into a pressure position. On the other hand, by inserting a rod-shaped tool into the intake passage 12g and pushing the front shaft member 11e of the operating member 11 backward, the operating member 11 is configured to move from the depressurizing position to the pressurized position. Has been done.

According to such a configuration, the operating member 11 unintentionally moves from the pressurized position to the depressurized position due to an erroneous operation or the like, and as a result, the exhaust sound of the pressurized air is generated to surprise the user. It is possible to suppress the occurrence of the problem. However, since a tool is required to switch the flow path, the switching operation is troublesome. In addition, foreign matter such as dust may enter the valve chamber 12a through the intake port 12f.

The embodiment of the present disclosure exemplified below can solve such a problem, enable a simple switching operation, and suppress the intrusion of foreign matter.

In the flow path switching mechanism 10 according to the first embodiment shown in FIGS. 9 to 10, the operating member 11 has a second screwed portion 11 g, which is a screwed portion screwed to the housing 12 at least in a pressurized position, and a valve. The present invention relates to a comparative example, except that the second operated portion 11h, which is an operated portion connected to the rear end of the body 11a and exposed from the housing 12, is provided, and the filter member 13 is provided upstream of the intake port 12f. It has the same configuration as the flow path switching mechanism 10. The air pump 1 according to the present embodiment has the same configuration as the air pump 1 according to the comparative example in other respects.

In the first embodiment, the second screwed portion 11g is screwed into the second screwed portion 12o, which is the screwed portion of the housing 12, over the entire stroke between the pressurizing position and the depressurizing position. The second screwed portion 12o is provided on the second end member 12n.

The valve body 11a is integrally connected to the second screwed portion 11g. The valve body 11a may be configured to be connected to the second screwed portion 11g so as to be relatively rotatable around the first central axis O1.

The second operated portion 11h can rotate together with the second screwed portion 11g. The second operated portion 11h is composed of a second knob 11i which is a rotatable knob together with the second screwed portion 11g. The second operated portion 11h has a connecting shaft portion 11j whose diameter is smaller than that of the second operated portion 11h and a second screwed portion 11g whose diameter is smaller than that of the connecting shaft portion 11j at the rear end of the valve body 11a. It is connected through. The front end of the second operated portion 11h is connected to the rear end of the connecting shaft portion 11j, and the front end of the connecting shaft portion 11j is connected to the rear end of the valve body 11a.

The second operated portion 11h is integrally connected to the second screwed portion 11g. The second operated portion 11h is rotatably held by the housing 12, the relative rotation is restricted with respect to the second screwed portion 11g, and the second screwed portion 11h moves relative to the second screwed portion 11g in the front-rear direction. It may be a possible configuration.

The second screwed portion 11g and the second screwed portion 12o are right-handed threads. However, the second screwed portion 11g and the second screwed portion 12o may be left-handed. The second screwed portion 11g is a male screw, and the second screwed portion 12o is a female screw. The thread shape of the male and female threads can be set as appropriate. The second screwed portion 11g and the second screwed portion 12o may be intermittent screws in which threads are provided intermittently.

The exhaust port 12b includes an exhaust passage 12h including a gap (not shown) between the second screwed portion 11g and the second screwed portion 12o, and a gap between the front end surface of the connecting shaft portion 11j and the housing 12. It communicates with the external space S through. An exhaust passage including an exhaust port for communicating the rear end of the valve chamber 12a with the external space S may be provided in place of or in addition to the exhaust passage 12h.

The filter member 13 filters foreign substances such as dust in the air. The filter member 13 may be, for example, fibrous, net-like, porous, or the like. The material of the filter member 13 is not particularly limited, and may be, for example, cloth, metal, synthetic resin, ceramic, or the like.

The filter member 13 is arranged in the intake passage 12g having the intake port 12f as the downstream end. The housing 12 has a second set screw 12p forming a cylindrical shape coaxial with the first center axis O1. The outer peripheral surface of the second set screw 12p is screwed to the tip of the inner peripheral surface of the first end member 12m. A step portion 12q whose diameter is expanded toward the front is provided on the inner peripheral surface of the first end member 12 m, and a plate-shaped filter member 13 is sandwiched between the step portion 12q and the rear end of the second set screw 12p. To.

However, the filter member 13 does not need to be arranged in the intake passage 12g, and may be arranged outside the intake passage 12g so as to cover the upstream end of the intake passage 12g, for example. Further, the filter member 13 does not need to be provided upstream of the intake port 12f, and may be provided at the intake port 12f.

According to the first embodiment, the operating member 11 can be moved from the pressurizing position to the depressurizing position only by rotating the second operated portion 11h clockwise, and the second operated portion 11h is counterclockwise. The operating member 11 can be moved from the depressurized position to the pressurized position simply by rotating it clockwise. Therefore, it is not necessary to use a tool for switching the flow path, which enables a simple switching operation. Further, the filter member 13 can prevent foreign matter from entering the valve chamber 12a through the intake port 12f. Further, the second screwed portion 11g can prevent the operating member 11 from unintentionally moving from the pressurizing position to the depressurizing position.

In particular, in the first embodiment, since the second screwed portion 11g is screwed to the housing 12 over the entire stroke between the pressurizing position and the depressurizing position, the operating member 11 is unintentionally added. It is possible to suppress the movement between the pressure position and the depressurization position.

Next, the second embodiment will be illustrated and described. The flow path switching mechanism 10 according to the second embodiment shown in FIGS. 11 to 13 has a flow according to the first embodiment except that the second screw portion 11g is screwed to the housing 12 only at the pressurizing position. It has the same configuration as the road switching mechanism 10.

In the second embodiment, the second screwed portion 11g is configured to have a width equivalent to the width in the front-rear direction of the second screwed portion 12o, and the rear end of the second screwed portion 11g is connected. It is connected to the front end of the shaft portion 11j via a shaft member 11k whose diameter is smaller than that of the second screwed portion 11g.

According to the second embodiment, the second operated portion 11h is rotated clockwise to disengage the second screwed portion 11g from the second screwed portion 12o (see FIG. 12), and the second operated portion is operated. The operating member 11 can be moved from the pressurizing position (see FIG. 11) to the depressurizing position (see FIG. 13) simply by pressing the portion 11h forward. Further, the operating member 11 can be moved from the decompression position to the pressurization position only by pulling the second operated portion 11h backward and rotating the second operated portion 11h counterclockwise. Therefore, the same effect as in the case of the first embodiment can be obtained, and the switching operation can be easily performed with a small amount of rotation operation.

In the first and second embodiments described above, the drive mechanism 20 has various pressure chambers 25 that communicate with the inlet 12e and the outlet 12c and are driven to increase or decrease the volume. It can be changed. Further, in the first embodiment and the second embodiment described above, the vent mechanism 30 communicates with the connection port 12d of the flow path switching mechanism 10 when the operating member 11 is in the pressurizing position or in the depressurizing position. Various changes can be made as long as the opening 31 and the opening / closing member 32 that can open and close the vent opening 31 are provided.

It goes without saying that the above-described embodiment is an example of the present disclosure and can be changed in various ways.

For example, the flow path switching mechanism 10 and the air pump 1 according to the above-described embodiment can be changed in various ways as described below.

The flow path switching mechanism 10 according to the above-described embodiment includes an operating member 11 including a valve body 11a and a housing 12 including a valve chamber 12a for accommodating the valve body 11a so as to be able to move forward and backward between the pressurizing position and the depressurizing position. , And the valve chamber 12a is arranged in front of the exhaust port 12b, the outlet 12c arranged in front of the exhaust port 12b in the direction from the pressurizing position to the depressurizing position, and the outlet 12c. It has a connection port 12d, an inflow port 12e arranged in front of the connection port 12d, and an intake port 12f arranged in front of the inflow port 12e, and the valve body 11a takes in air at the pressurizing position. It is configured so that the port 12f is communicated with the inlet 12e and the outlet 12c is communicated with the connection port 12d, while the connection port 12d is communicated with the inlet 12e and the outlet 12c is communicated with the exhaust port 12b at the decompression position. The operating member 11 is connected to the rear end of the valve body 11a and is exposed from the housing 12 with the screwed portion (second screwed portion 11g) screwed to the housing 12 at least in the pressurized position (second screwed portion 11g). As long as it has the operated portion 11h) and the filter member 13 is provided upstream of the intake port 12f or the intake port 12f, various changes can be made.

However, in the flow path switching mechanism 10, it is preferable that the filter member 13 is arranged in the intake passage 12g having the intake port 12f as the downstream end.

Further, it is preferable that the screwed portion (second screwed portion 11 g) is screwed into the housing 12 over the entire stroke between the pressurizing position and the depressurizing position.

Further, it is preferable that the screwed portion (second screwed portion 11 g) is screwed to the housing 12 only at the pressurizing position.

Further, the operated portion (second operated portion 11h) is preferably a knob (second knob 11i).

The air pump 1 according to the above-described embodiment has various types as long as it has a flow path switching mechanism 10 and a pressure chamber 25 that communicates with the inlet 12e and the outlet 12c and is driven to increase or decrease the volume. It can be changed.

However, it is preferable that the pressure chamber 25 is manually driven.

Further, it is preferable that the pressure chamber 25 is driven by gripping the hand grip 24 against the urging force of the spring 23.

Further, the air pump 1 has a vent port 31 that communicates with the connection port 12d of the flow path switching mechanism 10 regardless of whether the operating member 11 is in the pressurizing position or the depressurizing position, and an opening / closing member that can open and close the vent port 31. It is preferable to have 32 and.

1 Air pump 10 Flow path switching mechanism 11 Actuating member 11a Valve body 11b First sealing part 11c Second sealing part 11d Valve body 11e Front shaft member 11f Rear shaft member 11g Second screwed part 11h Second operated part 11i 2nd knob 11j Connection shaft 11k Shaft member 12 Housing 12a Valve chamber 12b Exhaust port 12c Outlet 12d Connection port 12e Inflow port 12f Intake port 12g Intake passage 12h Exhaust passage 12i Inflow passage 12j Connection passage 12k Outflow passage 12l Housing body 12m 1st end member 12n 2nd end member 12o 2nd screwed part 12p 2nd set screw 12q Step part 13 Filter member 20 Drive mechanism 20a Hand grip mechanism 21 1st member 21a Cylinder 21b Bottom member 21c Inlet hole 21d Outlet hole 21e Top wall 21f Peripheral wall 22 Second member 22a Piston 22b Central shaft member 22c Step 23 Spring 24 Hand grip 24a Grip link 24b Grip 24c Connecting part between first member and grip 24d Link 24e Connecting part between second member and link 24f Connecting shaft 25 Pressure chamber 30 Vent mechanism 31 Vent port 32 Opening / closing member 32a First screwed part 32b Shaft body 32c Equal diameter part 32d Reduced diameter part 32e First operated part 32f First knob 32g Shaft part 33 Block 33a First Screwed part 33b Holding cylinder 33c 1st set screw 33d Base member 33e Lid member 33f Cover member 33g Washer 33h Step part 33i Accommodating recess 33j Communication path 33k 1st through hole 33l 2nd through hole 33m 3rd through hole 33n 3rd Sealing part 33o Holding member Main body 34 Sealing member 35 Ventilation passage F Pushing pressure F1 1st pushing pressure F2 2nd pushing pressure O1 1st central axis O2 2nd central axis O3 3rd central axis P1 Upper 1st axis P2 Upper 1st 2-axis line Q1 Lower 1st axis Q2 Lower 2nd axis R Central axis S External space

Claims (7)

An actuating member with a valve body and
It has a housing provided with a valve chamber for accommodating the valve body so as to be able to move forward and backward between the pressurizing position and the depressurizing position.
The valve chamber has an exhaust port, an outlet arranged in front of the exhaust port in the direction from the pressurizing position to the depressurizing position, and a connection port arranged in front of the outlet. It has an inlet arranged in front of the connection port and an intake port arranged in front of the inlet.
The valve body communicates the intake port to the inlet and the outlet to the connection port at the pressurization position, while communicating the connection port to the inlet and the flow at the decompression position. It is configured to allow the outlet to communicate with the exhaust port.
The actuating member has a screwed portion that is screwed into the housing at least at the pressurized position, and an operated portion that is connected to the rear end of the valve body and is exposed from the housing.
A filter member is provided upstream of the intake port or at the intake port.
Channel switching mechanism. The flow path switching mechanism according to claim 1, wherein the filter member is arranged in an intake passage having the intake port as a downstream end. The flow path switching mechanism according to claim 1 or 2, wherein the screw portion is screwed into the housing over the entire stroke between the pressurizing position and the depressurizing position. The flow path switching mechanism according to any one of claims 1 to 3,
It has a pressure chamber that communicates with the inlet and the outlet, respectively, and is driven to increase or decrease the volume.
Air pump. The air pump according to claim 4, wherein the pressure chamber is manually driven. The air pump according to claim 5, wherein the pressure chamber is driven by gripping the hand grip against the urging force of the spring. A vent port that communicates with the connection port of the flow path switching mechanism regardless of whether the operating member is in the pressurizing position or the depressurizing position.
It has an opening / closing member that can open / close the vent port.
The air pump according to any one of claims 4 to 6.

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