JP2009250419A - Air supply plug and electric motor for valve drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air supply plug for an airtight inspection of a casing of an electric motor. <P>SOLUTION: A plug body 4 is projected inside a casing 3. An outer hole 12 extending from an air supply port 10 to a first opening and closing port 11 on a peripheral surface and an inner hole 15 extending from a second opening and closing port 13 on the peripheral surface to a blowout port 14 are formed on the plug body 4. The peripheral surface of the plug body 4 is covered by a rubber sleeve 6. The rubber sleeve 6 is expanded by supplying air to the air supply port 10. An air supply hole 5 is formed by interconnecting the outer hole 12 and the inner hole 15 in order to raise internal atmospheric pressure of the casing 3. An airtight inspection is carried out by checking existence of bubbles while the casing 3 is submerged. Flooding is prevented by making the rubber sleeve 6 close the air supply hole 5 after the airtight inspection. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air supply plug for performing an airtight inspection of a casing of an electric motor and a valve driving electric motor provided with the plug.

  Generally, a cargo ship is provided with a plurality of ballast tanks for supplying and draining ballast water and adjusting buoyancy. Each ballast tank is supplied with ballast water when no cargo such as crude oil is loaded, and when cargo is loaded. The hull is stabilized by draining ballast water.

  Ballast water is used by taking seawater at a port, etc., and is supplied or drained to each ballast tank from a seawater intake through a trunk pipe and a branch pipe branched from the seawater, and a valve provided on the branch pipe is used. By individually opening and closing, each ballast tank is supplied or drained.

  The drive unit for opening and closing the valve provided in the branch pipe is often hydraulically driven by a hydraulic cylinder, but the valve drive is used for the purpose of preventing the oil from leaking and improving efficiency. Adoption of electric motors is required.

  In order to employ this motor for driving a valve, it is necessary to prevent water from entering into electric parts such as a motor. On the other hand, for example, Patent Document 1 includes the motor in a casing and into the casing. Discloses an electric motor for driving a valve which prevents water from entering.

The motor for driving a valve (driving unit) of Patent Document 1 has its motor mounted in a casing composed of a base and a cover, and seals the portion of the base through which the valve plate drive shaft and cable penetrate, The partition plate is assembled and a pressurized air chamber is formed between the base and the partition plate to prevent water from entering the casing.
JP-A-6-288484 (paragraph numbers 0005 and 0006)

  However, even if the structure in which the casing is sealed is adopted, in order to adjust the electrical wiring and the valve opening, it is necessary to remove the cover and open the inside of the casing. Therefore, in order to reliably prevent water from entering the motor, it is required to check that the casing is securely sealed by performing an airtight inspection after the cover is attached.

  An object of the present invention is to provide an air supply plug for performing an airtight inspection of a casing of an electric motor and a valve driving electric motor provided with the plug.

  In order to achieve the above object, an air supply plug according to the present invention includes a plug main body provided in a casing of an electric motor, an air supply hole formed in the plug main body to supply air to the casing from the outside, and the air supply hole. And a valve body that opens and closes.

  According to the above configuration, since the air supply hole can be opened and air can be supplied to the casing from the outside, the casing can be submerged in the water tank and the presence or absence of air bubbles can be checked, thereby performing an airtight inspection of the casing. In addition, after the airtight inspection, the air supply hole can be closed by the valve body to prevent water from entering from the air supply hole. Accordingly, the electric motor is not used while the casing is not sufficiently sealed, and it is possible to prevent water from entering the electric parts of the electric motor.

  As a specific configuration, for example, a plug body is provided so as to protrude to the inside of the casing, and an air supply hole is connected to an outer hole extending from the air supply opening that opens to the outside of the casing to the first opening / closing port on the peripheral surface of the plug body, and the plug It is comprised with the inner side hole from the 2nd opening-and-closing port of a main body peripheral surface to the blower outlet opened inside a casing. Furthermore, the valve body normally covers the peripheral surface of the plug body, closes the first opening and closing opening and the second opening and closing, and when supplying air, opens the first opening and closing opening and opening by the supply air pressure. A rubber sleeve that communicates the hole and the inner hole.

  According to this configuration, by supplying air to the air supply port with sufficient supply air pressure, the gas pushes back the rubber sleeve as the valve body to open the first opening / closing port, and between the plug body and the rubber sleeve. It is blown out and the rubber sleeve is expanded. Accordingly, the second opening / closing port is also opened, and the outer hole and the inner hole communicate with each other through the space between the plug main body and the bulging rubber sleeve, so that the casing can be supplied with air from the outside.

  In addition, after the airtight inspection, the gas inside the casing whose air pressure has been increased by the supply air is naturally discharged while inflating the rubber sleeve through a path opposite to that during the supply. Further, after the gas inside the casing is sufficiently discharged, the rubber sleeve closes the first opening and the second opening by its elastic force, so that the air supply hole is securely closed to prevent water from entering from the air supply hole. be able to.

  Further, a cylindrical sleeve guide may be provided on the outer peripheral side of the plug main body, and a pressing portion for pressing the rubber sleeve may be provided between the sleeve guide and the plug main body. By doing so, it is possible to restrict the rubber sleeve from being excessively expanded by the sleeve guide, and to prevent the displacement due to the rubber sleeve being squeezed and inflated during supply. Further, since the gap between the sleeve guide pressing portion and the plug body is sealed with the rubber sleeve, even if the plug body is submerged, it can be prevented from entering the casing.

  In addition, the valve body is composed of a valve main body that opens and closes the outlet of the air supply hole that opens to the inside of the casing, and a protruding rod that protrudes from the valve main body and is inserted into the air supply hole, and further protrudes into the air supply hole. A guide is provided for guiding the valve body in the direction of contacting and separating the valve body from the outlet through contact with the rod, and the valve body is urged between the guide and the valve body in a direction in which the valve body contacts the outlet. A spring may be provided.

  According to this configuration, by supplying air to the air supply hole with sufficient supply air pressure, the gas pushes back the valve body against the urging force of the spring and opens the air outlet, so that air is supplied to the casing from the outside. be able to. In addition, after the airtight inspection, the valve body closes the air outlet by the urging force of the spring, so that the air supply hole can be reliably closed to prevent water from entering from the air supply hole. Further, since the protruding rod and the guide for guiding the valve main body are accommodated in the air supply hole, another member for holding them is unnecessary, and the air supply plug can be made a simple structure.

  In addition, the air supply hole that opens to the outside of the casing is set to a size that can accommodate the valve body, and a valve seat that receives the valve body is formed inside the air supply hole. You may attach to the inner side of the cap which covers an opening | mouth via a spring.

  According to this configuration, it is possible to open the air supply hole and supply air to the casing from the outside simply by removing the cap. By simply attaching the cap, the valve body is pressed against the valve seat by the biasing force of the spring. Can be securely closed and sealed to prevent water from entering through the air supply holes.

  Further, a valve driving motor having a motor that supplies a driving force for opening and closing a valve, a casing that houses the motor, and an output shaft that outputs the driving force of the motor to the outside of the casing, the output shaft has a casing. Since it penetrates inside and outside, sealing of the casing tends to be insufficient, and confirmation of the airtight state of the casing is particularly required. Therefore, it is preferable to attach the above-mentioned air supply plug to the casing.

  As is apparent from the above description, according to the present invention, the casing of the electric motor is submerged and air is supplied from the supply hole of the supply plug, whereby the casing can be checked for airtightness. By closing the air supply hole with the body, it is possible to prevent water from entering from the air supply hole. Thereby, after removing the cover of the casing and adjusting the electrical wiring and the valve opening, the electric motor is not used while the casing is not sufficiently sealed, and the electric parts of the electric motor can be prevented from being flooded.

  Hereinafter, first to third embodiments of an air supply plug and a valve drive motor according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, the configuration of the air supply plug 1 will be described. FIG. 1 is a longitudinal sectional view of an air supply plug according to a first embodiment of the present invention.

  The air supply plug 1 includes a cylindrical plug body 4 that is attached to the casing 3 of the valve drive motor 2 so as to protrude inward thereof, and a supply air that is formed on the plug body 4 and supplies air to the casing 3 from the outside. A rubber sleeve 6 as a valve body that is attached so as to be in close contact with the peripheral surface of the plug body 4 and opens and closes the air supply hole 5, and is attached to the casing 3 so as to protrude inward, and on the outer peripheral side of the plug body 4 And a cylindrical sleeve guide 7 positioned at a distance from each other.

  The plug body 4 is made of, for example, metal, and a flange 8 is formed at a base end portion thereof, and a large diameter portion 9 having a larger diameter than other portions is formed in the vicinity of the flange 8. The plug body 4 is formed by screwing the large diameter portion 9 into the sleeve guide 7 from the outside of the casing 3 until the flange 8 comes into contact with the outer surface of the casing 3. Are attached to the casing 3 via the sleeve guide 7 with a gap between them.

  The air supply hole 5 includes an outer hole 12 extending from the air supply port 10 recessed in the proximal end surface of the plug main body 4 to the first opening / closing port 11 on the peripheral surface of the plug main body 4, and the first of the peripheral surface of the plug main body 4. The inner opening 15 extends from the two opening / closing ports 13 to the blowout port 14 on the end surface of the plug body 4. The air supply opening 10 is open to the outside of the casing 3 and can be fitted with an air supply hose fitting 16 to supply air to the air supply opening 10 and to communicate the outer hole 12 and the inner hole 15. Thus, air is blown out from the air outlet 14 that opens inside the casing 3.

  The rubber sleeve 6 is a sleeve made of a stretchable rubber-like elastic body, and the inner diameter in a free state is set smaller than the outer diameter of the plug body 4 so as to be in close contact with the peripheral surface of the plug body 4 in a normal state. .

  Of the peripheral surface of the plug body 4 to which the rubber sleeve 6 is brought into close contact, a bulging portion 17 bulging radially outward from the first opening / closing port 11 to the proximal end side and from the second opening / closing port 13 to the distal end side. The rubber sleeve 6 is more closely attached to the bulging portion 17. Thereby, when supplying or exhausting air from the air supply hole 5, only the portion of the rubber sleeve 6 that covers the first opening / closing port 11 and the second opening / closing port 13 between the bulging portions 17 is plugged by the supply air pressure or the exhaust pressure. The outer hole 12 and the inner hole 15 are communicated with each other at a distance from the peripheral surface of the main body 4.

  The sleeve guide 7 is made of, for example, metal, and is attached by screwing a base end portion thereof into an attachment hole of the casing 3. The periphery of the attachment hole is covered with the flange 8 of the plug body 4, and It is surrounded and sealed by an O-ring 18 disposed on the back side.

  A pinching portion 19 bulging radially inward is formed at the distal end portion of the sleeve guide 7. By attaching the plug body 4 to the sleeve guide 7, the tip portion of the plug body 4 and the pinching portion 19 are connected. The tip of the rubber sleeve 6 is sandwiched between them. Thereby, the displacement of the rubber sleeve 6 is prevented, and the penetration of the water immersed in the casing 3 from the gap between the sleeve guide 7 and the plug body 4 screwed to the sleeve guide 7 is prevented.

  Next, how the air supply plug 1 is supplied to the casing 3 to check the airtightness of the valve drive motor 2 will be described. FIG. 2 is a longitudinal sectional view showing an air supply state of the air supply plug.

  First, an air supply hose fitting 16 is attached to the air supply port 10 of the air supply plug 1 to supply air, thereby increasing the air pressure in the outer hole 12, and the plug body 4 and rubber from the first opening / closing port 11. Air is blown out between the sleeve 6 and the rubber sleeve 6 is expanded. Thereby, the first opening / closing port 11 and the second opening / closing port 13 closed by the rubber sleeve 6 are opened, and the outer hole 12 and the inner hole 15 are formed through the space between the plug body 4 and the rubber sleeve 6. The air is blown out from the outlet 14 of the inner hole 15 to increase the pressure inside the casing 3.

  Here, since the excessive swelling of the rubber sleeve 6 is regulated by the sleeve guide 7 and the plug body 4 and the clamping portion 19 of the sleeve guide 7 are clamped to prevent displacement, the plug body 4 is kept in close contact with the bulging portion 17, and air does not leak from portions other than the air supply holes 5.

  Next, the valve-driving motor 2 in which the atmospheric pressure inside the casing 3 is increased is submerged in the water tank, and an airtight inspection is performed by visually confirming whether or not bubbles are generated. At this time, if the sealed state of the casing 3 is insufficient, bubbles are generated, so that the sealed state of the casing 3 can be easily determined.

  After the airtight inspection is completed, the valve drive motor 2 is taken out of the water tank, and the air supply hose fitting 16 is removed from the air supply port 10. At this time, the air pressure inside the casing 3 remains increased, and the rubber sleeve 6 expands to connect the outer hole 12 and the inner hole 15, so that the air inside the casing 3 flows from the outlet 14 to the inner hole. 15 and the outer hole 12 are exhausted from the air supply port 10.

  When the air pressure inside the casing 3 is sufficiently reduced, the rubber sleeve 6 is deflated and tightly attached to the peripheral surface of the plug body 4, and the first opening / closing port 11 and the second opening / closing port 13 are closed, so that water from the air supply hole 5 is submerged. Is blocked.

  Next, the valve drive motor 2 provided with the air supply plug 1 will be described. 3 is a front view of the motor for driving a valve according to the present invention, FIG. 4 is a sectional view taken along the line AA, and FIG. 5 is a sectional view taken along the line BB.

  The valve drive motor 2 is for opening and closing a valve provided in, for example, a water supply / drainage pipe of a ballast tank of a cargo ship and supplies a casing 3 and a driving force housed in the casing 3 to open and close the valve. And an output shaft 21 that outputs the driving force of the motor 20 to the outside of the casing 3, and the air supply plug 1 is attached to the casing 3.

  The casing 3 is formed by covering the upper opening of the container-like base 22 whose upper side is opened with a cover-like container-like cover 23, in which spaces such as a gear chamber 24, an electrical component chamber 25, and a motor chamber 26 are provided. A bearing 27 that receives the output shaft 21 is formed so as to penetrate the bottom. The base 22 and the cover 23 are attached with bolts 28, and the boundary surfaces thereof are sealed with a sealing material 29.

  The motor 20 is housed in the motor chamber 26, and the rotary shaft 30 is disposed so as to pass through the partition wall that partitions the gear chamber 24 and the motor chamber 26 toward the gear chamber 24, and the rotation of the rotary shaft 30 is rotated in the gear chamber. The gear 31 accommodated in 24 is rotated. Thereby, the driving force of the motor 20 is transmitted to the output shaft 21 through the gear 31 to drive the valve to open and close.

[Second Embodiment]
First, the configuration of the air supply plug 32 will be described. FIG. 6 is a longitudinal sectional view of an air supply plug according to a second embodiment of the present invention, and FIG. 7 is a front view of a guide plate.

  The air supply plug 32 includes a plug main body 33 attached to the casing 3 of the valve drive motor 2, an air supply hole 34 formed in the plug main body 33 for supplying air to the casing 3 from the outside, and opening and closing the air supply hole 34. And a guide plate 36 that guides the valve body 35 in the opening and closing direction, and a tension spring 37 that biases the valve body 35 in the closing direction.

  The plug body 33 is made of, for example, metal and has a cylindrical shape with a central hole as an air supply hole 34, and from the outside to a mounting hole 38 that penetrates the casing 3 inward and outward so that the base end portion protrudes to the outside of the casing 3. It is attached by screwing.

  The base end opening of the plug main body 33 is widened in the radial direction to be an air supply port 39 and is closed from the outside with a cap 40 to prevent water from entering the air supply hole 34. Inside, a disc-shaped guide plate 36 is attached by screwing the periphery. A guide hole 41 for guiding the valve body 35 is formed at the center of the guide plate 36, and a vent hole 42 for allowing air passing through the air supply hole 34 to pass therethrough is formed around the guide hole 41.

  Of the mounting hole 38, a positioning portion 43 is formed in the vicinity of the inner surface of the casing 3 so as to be positioned by bringing the tip of the plug main body 33 into contact with the central hole. The outlet 44 is set to the same size and blows air into the casing 3. Further, an O-ring 45 that seals between the inner peripheral surface of the mounting hole 38 and the plug body 33 is provided in the mounting hole 38 near the outer surface of the casing 3.

  The valve body 35 is made of, for example, metal, a disk-shaped valve body 46 that covers the air outlet 44 of the air supply hole 34 from the inside of the casing 3 so as to be openable and closable, and a protrusion that protrudes from the valve body 46 and is inserted into the air supply hole 34. The tip of the protruding bar 47 penetrates the guide hole 41 of the guide plate 36 so that it can be inserted and removed. Further, a stopper 48 for restricting the movement of the valve body 35 is provided outside the guide plate 36 at the distal end portion of the protruding rod 47.

  Thus, the valve body 35 is guided in a direction in which the protruding rod 47 is inserted into and removed from the guide hole 41 within a range from the position where the valve body 46 contacts the outlet 44 to the position where the stopper 48 contacts the guide plate 36. The valve body 35 comes into contact with and separates from the outlet 40.

  The tension spring 37 is provided so as to surround the protruding rod 47 in a spiral shape, and both ends of the tension spring 37 are attached to the valve body 46 and the guide plate 36 to urge the valve body 35 in the closing direction. ing. Thereby, normally, the valve body 46 contacts the inner surface of the casing 3 to close the outlet 40, and further, the O-ring 49 on the back side of the valve body 46 surrounds and seals the outlet 44, Water is prevented from entering the casing 3 from the air supply hole 34.

  Next, a state in which air is supplied to the casing 3 using the air supply plug 32 and the valve drive motor 2 is inspected for airtightness will be described. FIG. 8 is a longitudinal sectional view showing an air supply state of the air supply plug.

  First, the cap 40 is removed from the air supply port 39 of the air supply plug 32, and the air supply hose port fitting 50 is attached to supply air, thereby increasing the air pressure of the air supply hole 34 and the valve body 35 to the tension spring 37. It pushes out toward the inside of the casing 3 against the urging force. Here, the movement of the valve body 35 is limited to a range until the stopper 48 contacts the guide plate 36.

  As a result, the valve body 46 is separated from the inner surface of the casing 3 to open the air outlet 40, and the air supplied from the air inlet 39 to the air inlet 34 passes through the vent hole 42 of the guide plate 36 from the air outlet 40. The air pressure inside the casing 3 is increased by blowing it out.

  Next, as in the first embodiment, the valve drive motor 2 is submerged in the water tank to perform an airtight inspection, and then the air supply hose fitting 50 is removed from the air supply port 39. As a result, the air pressure in the air supply hole 34 decreases, the valve body 35 is pulled out toward the outside of the casing 3 by the urging force of the tension spring 37, and the valve main body 46 comes into contact with the inner surface of the casing 3 to open the air outlet 40. It closes to prevent water from entering through the air supply hole 34 into the casing 3. Further, a cap 40 is attached to the air supply port 39 to prevent water from entering the air supply hole 34. The configuration of the valve drive motor 2 is the same as that of the first embodiment.

[Third Embodiment]
First, the configuration of the air supply plug 51 will be described. FIG. 9 is a longitudinal sectional view of an air supply plug according to a third embodiment of the present invention.

  The air supply plug 51 includes a plug main body 52 attached to the casing 3 of the valve drive motor 2, an air supply hole 53 formed in the plug main body 52 for supplying air to the casing 2 from the outside, and an air supply hole 53 outside. , A spherical valve body 55 that opens and closes the air supply hole 53, and a compression spring 56 that urges the valve body 55 in the closing direction.

  The plug main body 52 is made of, for example, metal and has a cylindrical shape with a central hole serving as an air supply hole 53. The plug main body 52 has an attachment hole 57 that penetrates the casing 3 from the outside to the outside so as to project the base end portion to the outside of the casing 3. It is attached by screwing. Here, the mounting hole 57 is provided with an O-ring 58 that seals between the inner peripheral surface of the mounting hole 57 and the plug body 52.

  The base end opening of the plug body 52 is an air supply port 59 that opens to the outside of the casing 3. The air supply port 59 is covered with a metal cap 54 from the outside to prevent water from entering the air supply hole 53. Has been. The air supply port 59 has an inner diameter that is wider than the tip of the plug body 52 and can accommodate the valve body 55, and a curved surface portion that gradually decreases from the air supply port 59 toward the tip. Is the valve seat 60 that receives the valve body 55.

  A valve body 55 made of, for example, a polymer material is attached to the inside of the cap 54 via a compression spring 56, and the valve body 55 is attached to the air supply port 59 by attaching the cap 54 to the air supply port 59. And is pressed against the valve seat 60 by the urging force of the compression spring 56. As a result, the air supply hole 53 is closed and water intrusion from the air supply hole 53 into the casing 3 is prevented. In addition, the valve body 55 can also be formed from non-metal other than a polymer material, or a metal.

  Next, a state in which the casing 3 is supplied with the air supply plug 51 and the valve drive motor 2 is inspected for airtightness will be described. FIG. 10 is a longitudinal sectional view showing an air supply state of the air supply plug.

  First, by removing the cap 54 from the air supply port 59 of the air supply plug 51, the air supply port 59 is opened, and the valve body 55 is removed from the valve seat 60 to open the air supply hole 53. Furthermore, the air pressure inside the casing 3 is increased by attaching the fitting 61 of the air supply hose to the air supply port 59 and supplying air to the air supply hole 53.

  Next, similarly to the first embodiment and the second embodiment, the valve drive motor 2 is submerged in the water tank and airtightness inspection is performed, and then the fitting 61 of the supply hose is removed from the supply port 59, and the supply hole Air is discharged from 53, and the atmospheric pressure inside the casing 3 is reduced to atmospheric pressure. Further, by attaching the cap 54 to the air supply port 59, the air supply port 59 is closed with the cap 54, and the valve body 55 on the back side of the cap 54 is pressed against the valve seat 60 by the urging force of the compression spring 56 to supply the air supply hole. 34 is closed to prevent water from entering the casing 3. The configuration of the valve drive motor 2 is the same as that of the first embodiment.

The longitudinal cross-sectional view of the plug for air supply of 1st Embodiment of this invention Longitudinal sectional view showing an air supply state of an air supply plug (first embodiment) Front view of the valve drive motor of the present invention A-A cross section BB cross section Longitudinal sectional view of the air supply plug of the second embodiment of the present invention Front view of guide plate Longitudinal sectional view showing an air supply state of an air supply plug (second embodiment) Longitudinal sectional view of the air supply plug of the third embodiment of the present invention Longitudinal sectional view showing an air supply state of an air supply plug (third embodiment)

Explanation of symbols

1 Air supply plug (first embodiment)
2 Valve drive motor 3 Casing 4 Plug body 5 Air supply hole 6 Rubber sleeve 7 Sleeve guide 10 Air supply port 11 First open / close port 12 Outer hole 13 Second open / close port 14 Air outlet 15 Inner hole 19 Clamping portion 20 Motor 21 Output Shaft 32 Air supply plug (second embodiment)
33 Plug body 34 Air supply hole 35 Valve body 36 Guide plate 37 Tension spring 39 Air supply port 41 Guide hole 44 Air outlet 46 Valve body 47 Projection rod 51 Air supply plug (third embodiment)
52 Plug body 53 Air supply hole 54 Cap 55 Valve body 56 Compression spring 59 Air supply port 60 Valve seat

Claims (6)

  An air supply comprising: a plug main body provided in a casing of the electric motor; an air supply hole formed in the plug main body for supplying air to the casing from the outside; and a valve body for opening and closing the air supply hole Plug.   The plug body is provided so as to protrude to the inside of the casing, and the air supply hole includes an outer hole extending from the air supply opening that opens to the outside of the casing to the first opening / closing port of the plug body circumferential surface, and a first hole on the plug body circumferential surface. The valve body normally covers the peripheral surface of the plug body, closes the first opening and closing opening and the second opening and closing, and when supplying air 2. The air supply plug according to claim 1, wherein the air supply plug is a rubber sleeve that opens the first opening and the second opening by the supply air pressure so as to communicate the outer hole and the inner hole.   A cylindrical sleeve guide is provided on the outer peripheral side of the plug body with a space therebetween, and a clamping portion for clamping a rubber sleeve is provided between the sleeve guide and the plug body. 2. The air supply plug according to 2.   The valve body includes a valve body that covers the air outlet opening that opens to the inside of the casing so as to be openable and closable, and a protruding rod that protrudes from the valve body and is inserted into the air supply hole. A guide that contacts and guides the valve body in a direction to contact and separate from the air outlet is provided, and the valve body is urged between the guide and the valve body in a direction in which the valve body contacts the air outlet. The air supply plug according to claim 1, further comprising a spring.   The air supply hole is set to a size that allows the air supply opening that opens to the outside of the casing to accommodate the valve body, and a valve seat that receives the valve body is formed inside the air supply hole. The air supply plug according to claim 1, wherein the air supply plug is attached to the inside of the cap covering the mouth via a spring.   A motor that supplies a driving force for opening and closing the valve, a casing that houses the motor, and an output shaft that outputs the driving force of the motor to the outside of the casing, the casing having any one of claims 1 to 5. A motor for driving a valve, characterized in that the air supply plug described in 1 is mounted.

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