JP2000054963A - Portable electric air pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability without executing an operation exceeding an allowable time by automatically off-switching a switch with a cage, when discharge pressure of a pump part is increased by executing a continuous operation. SOLUTION: A switch hole and a cage display part are formed on a ceiling plate of a portable electric air pump, and an operating knob 9a provided on a switch 9 is arranged in the switch hole. In a cage display part, a memory is displayed on a transparent part arranged on a center part. When pressure in a discharge nozzle 28 exceeds a value which is set beforehand by operating a pump part 3, a tip end part of a rod 8e abuts on a side part of a rotating direction of the operating knob 9a in a switch case 9c. The operating knob 9a is push-pressed in the rotating direction, and is forcibly rotated in an anticlockwise direction so as to execute off-switch. The switch 9 is automatically off-switched, an operation of the pump part 3 is stopped, arid pressure in a discharge nozzle 28 does not exceed a value which is set beforehand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric air pump used to inflate tires, boats, and the like.

[0002]

2. Description of the Related Art As a portable electric air pump for injecting air into tires, boats, etc., a pump unit is connected to a motor unit, and when the motor unit is energized by turning on a switch, the air is pumped from the pump unit. Is known.

[0003]

In the portable electric air pump described above, as long as the switch is turned on, the pump section continues to move. If it cannot be stopped and is used continuously beyond the permissible time, there is a risk of failure.

[0004]

SUMMARY OF THE INVENTION A portable electric air pump according to the present invention is a portable electric air pump which does not operate continuously for more than an allowable time by automatically turning off a switch when a desired pressure is reached. It is intended to provide.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a portable electric air pump, comprising: a case; an air inlet disposed on one side of the case; and an air exhaust disposed on the other side of the case. An outlet, a pump housing portion formed in the case, a motor portion disposed in the pump housing portion, and generating a rotational force when energized, a switch electrically connected between the motor portion and a power supply, and a fluid A pump section formed with a suction section and a fluid discharge section and arranged on the air discharge port side in the pump housing section, and for discharging a fluid sucked from the fluid suction section from the fluid discharge section by a rotational force given by a motor section; A gauge connected to the fluid discharge section of the pump section to display the discharge pressure of the pump section and to switch off when the discharge pressure of the pump section exceeds a predetermined value; Disposed air inlet side parts coupled to the motor unit, and the air sucked from the air intake by the rotation of the motor unit and characterized in that a configuration in which a rotary blade for discharging from the air outlet.

In a portable electric air pump according to a second aspect of the present invention, the gauge has a holder connected to a fluid discharge portion of the pump portion and a predetermined length,
A plunger that is movably supported in the holder and protrudes from the holder toward the switch when the discharge pressure of the pump unit increases, and a rod coupled to the plunger is provided.
The switch is provided with an operation knob that is turned off by being pressed by a rod.

In the portable electric air pump according to a third aspect of the present invention, the gauge has a holder connected to a fluid discharge portion of the pump portion, and a movable portion of the pump portion which is movably supported in the holder. A plunger projecting from the holder to the switch side when the discharge pressure increases, a rod connected to the plunger, and a discharge pressure adjusting member capable of changing the length of the rod by being gradually switched and connected in the axial direction of the rod. The switch is provided with an operation knob that is turned off by being pressed by the discharge pressure adjusting member.

In the portable electric air pump according to a fourth aspect of the present invention, the first external connection member connected to the fluid discharge portion of the pump portion and drawn out of the case from the air inlet, and the motor portion include: A second external connection member that is electrically connected and drawn out of the case from the air intake; a partition formed at a position recessed from the air intake of the case; and a communication from the air intake into the pump housing. And a slit formed in the partition plate.

[0010]

According to the portable electric air pump according to the first aspect of the present invention, as a result of continuous operation,
When the discharge pressure of the pump section increases, the gauge automatically switches off the switch. Therefore, it does not operate beyond the allowable time.

In the portable electric air pump according to the second aspect of the present invention, when the pump section operates, the pressure in the holder increases, and the rod connected to the plunger protrudes toward the switch. Then, when the discharge pressure of the pump unit increases due to the continuous operation of the pump unit, the rod presses the operation knob of the switch to switch off the switch. Therefore, in addition to the function of claim 1, the means for switching off the switch is constituted only by the plunger and the rod.

In the portable electric air pump according to the third aspect of the present invention, when the discharge pressure adjusting member is coupled to a predetermined position in the axial direction of the plunger and the pump section operates, the pressure in the holder increases, The discharge pressure adjusting member projects to the switch side together with the rod of the plunger. Then, when the discharge pressure of the pump section increases due to the continuous operation of the pump section, the discharge pressure adjusting member presses the operation knob of the switch to switch off the switch. Therefore, in addition to the effect of the first aspect, the pressure at which the switch is turned off is appropriately changed depending on the coupling position of the discharge pressure adjusting member to the plunger.

In the portable electric air pump according to claim 4 of the present invention, since the space is formed between the air intake and the partition plate, the first and second external connection members are not used when not in use. It is stored in space. In addition, when the rotating blades are rotated by the rotation of the motor unit, a greater negative pressure is generated on the slit side of the partition plate, so that air is efficiently taken from the air intake into the pump housing in the case, and It is discharged from the outlet. Therefore, Claim 1,
In addition to the effects of the above two and three, the accommodating place of the first and second external connection members is secured, and the motor and the pump are forcibly cooled to withstand continuous operation.

[0014]

1 to 6 show a first embodiment of a portable electric air pump according to the present invention.

The illustrated portable electric air pump 1 mainly includes a case 2, a pump unit 3, a motor unit 4, a fan 5, a hose 6, a power cord 7, a gauge 8, and a switch 9.

As shown in FIG. 3, case 2
And a pair of second cases 2b formed on the first case 2a. The first case 2a is integrally connected by screwing a screw 40 into the second case 2b.

The case 2 includes a front plate 2c, a rear plate 2d, a first side plate 2e disposed on one side of the front plate 2c, a second side plate 2f disposed on the other side of the front plate 2c, and a top plate. 2g, bottom plate 2
h are provided respectively.

A handle 14 is formed substantially at the center of each of the front plate 2c and the rear plate 2d. The handle 14
As shown in FIG. 5, the front plate 2c and the rear plate 2d are formed in a substantially cylindrical shape by being divided from the lower side of the front plate 2c and the rear plate 2d. ing. The handle 14 is used to hold the portable electric air pump 1 when carrying it.

On the front plate 2c and the rear plate 2d, air outlets 10 and 11 are formed near the upper side where the handle 14 is formed.

As shown in FIG. 3, each of the air outlets 10 and 11 is formed in the shape of eight slots and arranged in two horizontal rows, and communicates from inside the case 2 to the outside. I have. The air discharge ports 10 and 11 have a function of discharging air guided through a space 35 described later to the outside of the case 2.

An air inlet 12 is formed in the first side plate 2e. As shown in FIG. 4, the air inlet 12 is formed as a substantially trapezoidal opening substantially at the center of the first side plate 2 e, and communicates from the outside of the case 2 to the inside. The air intake 12 has a function of taking in air from the outside of the case 2 to the inside. The opening area of the air inlet 12 is sufficiently larger than the size of a nozzle provided at an end of the hose 6 described later and a plug provided at an end of the power cord 7 described later.

A round hole 13 is formed in the second side plate 2f of the case 2 near the upper side. The suction nozzle 27 provided in the pump unit 3 is inserted through the round hole 13.

As shown in FIG. 3, a switch hole 15 and a gauge display section 16 are formed in the top plate 2g.

In the switch hole 15, an operation knob 9a provided on the switch 9 is arranged, and the gauge display section 16 has a blind 16a in a transparent portion arranged in the center. The burrs 16a are used for displaying a gauge 8 described later.

The switch 9 is of a snap type, and has an operation knob 9a, as shown in FIG.
A push rod 9b, a switch case 9c, a first terminal 9d, a second terminal 9e, and a movable contact piece 9f are provided. The first terminal 9d is electrically connected to one side of the power cord 7, and the second terminal 9e is electrically connected to a first brush terminal (not shown) provided in the motor unit 4. A second brush terminal (not shown) provided in the motor unit 4 is electrically connected to the other end of the power cord 7. The movable contact piece 9f is always electrically connected to the second terminal 9e.

In the switch 9, when the operation knob 9a is at an off position indicated by a virtual line in FIG. 6, the push rod 9b mounted on the operation knob 9a connects the movable contact piece 9f to the first terminal 9a.
d so that the first terminal 9d is
The power cord 7 is switched to the non-conducting state by being disconnected from the terminal 9e of the motor unit 4, and the first and second brush terminals of the motor unit 4 are not energized. When the operation knob 9a is rotated from the off position to the on position in a seesaw manner in a counterclockwise direction in FIG. 6 by pushing one side, the push rod 9b pushes the movable contact piece 9f toward the first terminal 9d. As a result, the first terminal 9d is electrically connected to the second terminal 9e to switch the power cord 7 to the conductive state, and the first and second brush terminals of the motor unit 4 are energized.

The switch 9 includes a switch case 9.
A rod insertion hole 9c1 is formed on the side of c. A rod 8e provided on a gauge 8 described later is inserted into the rod insertion hole 9c1, and the rod 8e comes into contact with a side in the rotation direction of the operation knob 9a in the switch case 9c. When the switch 9 is turned on, the discharge pressure of the pump unit 3 increases when the switch 9 is turned on.
When the rod 8e disposed in the rod insertion hole 9c1 presses the operation knob 9a in the rotating direction, the operation knob 9a is forcibly rotated counterclockwise in FIG. 1. The current supply to the second brush terminal is cut off.

The bottom plate 2h has four cushion portions 2h.
1, 2h1, 2h1, and 2h1 are formed. The lower surfaces of the cushion portions 2h1, 2h1, 2h1, 2h1 form the same plane, and the cushion portions 2h1, 2h1, 2h
h1 and 2h1 allow the portable electric air pump 1 to be stably stood.

[0029]

As shown in FIG. 1, a partition plate 17 is formed inside the first side plate 2e.
A member accommodating portion 18 is formed between the member 17 and the partition 17.

The partition plate 17 is arranged at a position away from the first side plate 2e in parallel with the first side plate 2e, and a slit 19 is formed substantially at the center of the partition plate 17.
As shown in FIG. 4, the slit 19 is divided into four parts, has a circular shape as a whole, and has a function of connecting the member accommodating part 18 to the air discharge ports 10 and 11. Slit 19
Has an opening area of the air inlet 1 formed in the first side plate 2e.
2 is smaller than the opening area. Since the opening area of the slit 19 is smaller than the opening area of the air inlet 12, the slit 19 has a function of generating a larger negative pressure on the partition plate 17 side of the pump accommodating section 20 described later when the fan 5 rotates. .

The member accommodating portion 18 is formed in a space from the first side plate 2e to the partition plate 17. The capacity of the member accommodating portion 18 is large enough to accommodate a hose 6 described later, a nozzle provided at an end of the hose 6, a power cord 7 also described later, and a plug provided at an end of the power cord 7. Therefore, the member accommodating portion 18 has a function of accommodating the hose 6 and the power cord 7 when not in use.

A pump housing 20 is arranged between the partition plate 17 and the air outlets 10 and 11. The pump unit 3 and the motor unit 4 are housed in the pump housing unit 20. The pump accommodating portion 20 passes through the lower side of the handle 14 from the left side in FIG.
Up to an L-shaped space. In the pump housing 20, motor supports 20a and 20b are formed substantially at the center of the handle 14, respectively.
In the vicinity of the air outlets 10 and 11, the pump support portions 20c and 2c
0d are respectively formed.

The motor support portions 20a and 20b are provided with motor yoke contact protrusions 20a1 and 20b1, respectively. The motor yoke contact protrusions 20a1 and 20b1
As shown in FIG. 5, the motor yoke 4a has a rectangular projection substantially at the center of a motor yoke 4a to be described later.
a, a pair of protrusions are formed on the upper side and the lower side of
The distance between 0a1 and 20b1 is slightly larger than the outer dimension of motor yoke 4a. Motor yoke contact protrusion 20
The motor yoke 4a is arranged in the radial direction of the motor yoke 4a in FIG. 1 by disposing the motor yoke 4a between the two protrusions 20a1 and 20b1.
The motor yoke 4a is movably supported on the left and right in FIG. 1, which is the cylinder direction of the motor yoke 4a. This is because the vibration generated from the pump unit 3 described later is small in the radial direction of the motor yoke 4a and is relatively large in the cylinder direction of the motor yoke 4a. This is to prevent a large vibration in the cylinder direction from being directly received. Between the motor yoke contact protrusions 20a1 and 20b1, a ventilation flow path 3 for providing a space around the motor yoke 4a.
5 are formed. The pump support portions 20c and 20d are provided with first and second damper holders 20c1 and 20d1, respectively. First and second damper holders 20
The c1 and 20d1 support first and second dampers 21 and 22 provided in the pump unit 3 described later, respectively.

The motor section 4 accommodates an armature (not shown) and a magnet (not shown) in a motor yoke 4a. The other end of the armature shaft 4 b is connected to the pump section 3. A fan 5 is fixed to an armature shaft 4b protruding from one end of the motor yoke 4a. The motor unit 4 includes a handle 14
, The weight of the motor portion 4 is applied to the center of the case 2 when the handle 14 is held by hand, so that the motor portion 4 is stabilized.

In the motor section 4, one end of the power cord 7 is electrically connected to a brush (not shown) for supplying electricity to the armature, and the power cord 7 is drawn out of the motor yoke 4a. In the motor unit 4, when a power supply current is supplied to the power supply cord 7, the armature rotates to apply a rotational force to the pump unit 3.

In the pump section 3, as shown in FIG.
A cylinder 23, a cylinder head 24, a suction valve 25, a discharge valve 26, a suction nozzle 27, a discharge nozzle 28, a piston body 29, an eccentric member 30, a first damper 21, and a second damper 22 are provided.

One end of the cylinder 23 is screwed to the motor yoke 4a of the motor unit 4. The other end of the cylinder 23 is provided with a suction port 23a and a discharge port 23b, and a cylinder head 24 is provided. Are combined. The cylinder head 24 is provided with a suction valve 25 connected to the suction port 23a and a discharge valve 26 connected to the discharge port 23b independently of each other, and a suction nozzle connected to the suction valve 25. 27,
Discharge nozzles 28 connected to the discharge valves 26 are independently provided. A liner 31 is mounted inside the other end of the cylinder 23.

In the pump section 3, the suction nozzle 27 inserted into the round hole 13 protrudes out of the case 2, and one end of the hose 6 is connected to the discharge nozzle 28. A first damper 21 is fitted outside the suction nozzle 27, and a second damper 22 is fitted outside the discharge nozzle 28, and the first damper 21 and the second damper 21 are fitted together. The damper 22 is the first and second damper holders 20 of the case 2
Supported by c1 and 20d1, respectively.

The eccentric member 30 has a disk-shaped main body 30a.
Further, an eccentric shaft portion 30b is formed with a predetermined amount of eccentricity with respect to the rotation center of the main body 30a. In the eccentric member 30, the main body 30a is screwed to the armature shaft 4b at the concentric position of the armature shaft 4b of the motor portion 4, and the eccentric shaft portion 30b is
And is rotatably fixed to a connecting rod 29a provided on the piston body 29 through the shaft.

The piston body 29 is integrally formed from a connecting rod 29a and a piston 29b. Connecting rod 2
As shown in FIG. 6, a big end 29a1 is formed at the tip end of the big end 29a.
1, the bearing 32 described above is fixed. A piston 29b is directly connected to the connecting rod 29 at a base end 29a2.

The piston 29b is substantially disc-shaped, and has a ring groove 29b1 formed substantially at the center thereof. An O-ring (O-ring) 33 is mounted in the ring groove 29b1. The piston ring 34 is mounted on the outside of the.

In the pump section 3, the rotation of the armature shaft 4b of the motor section 4 causes the piston body 2 to rotate.
When the big end 29a1 of the connecting rod 29a provided in the cylinder 9 rotates eccentrically with respect to the armature shaft 4b, the connecting rod 29a inclines with respect to the cylinder direction of the liner 31 so that the piston 29b swings and the bottom dead center and the top dead center. Move back and forth between points. Then, in a suction stroke in which the piston 29b moves from the top dead center to the bottom dead center, the suction valve 25 is opened due to the generation of a negative pressure inside the liner 31 to suck air from the suction nozzle 27, while the piston 29b In the exhaust stroke that moves from the bottom dead center to the top dead center, a positive pressure is generated inside the liner 31 to open the discharge valve 26 to supply air from the discharge nozzle 28 into the hose 6.

At this time, since the eccentric member 30 has a balance weight for counteracting the reaction force when the connecting rod 29a performs the oscillating movement, the vibration generated when the piston body 29 moves in the liner 31 is provided. Among them, the vibration component in the radial direction of the motor yoke 4a corresponding to the cylinder direction of the liner 31 is attenuated by the above-described balance weight, but the vibration component in the cylinder direction of the motor yoke 4a corresponding to the radial direction of the liner 31 is as described above. It is transmitted to the motor unit 4 side without being attenuated by the balance weight. The vibration transmitted to the motor yoke 4a is not transmitted to the case 2 because the motor yoke contact protrusions 20a1 and 20b1 of the case 2 support the motor yoke 4a so as to be movable in the cylinder direction. Does not receive the vibration generated by the pump unit 3.

The gauge 8 is attached to the discharge nozzle 28 of the pump section 3. The gauge 8 is housed in a cylindrical portion of the handle 14, and includes a plunger 8a, a holder 8b, a communication member 8c, a first return spring 8d, a rod 8e, Two return springs 8f are provided, respectively.

The communication member 8c has a discharge nozzle 28 on one side.
And the other side is connected to the inside of the holder 8b. The holder 8b is provided with the discharge nozzle 28
The plunger 8a to which the O-ring (O-ring) 8g is attached is held via a first return spring 8d housed inside so as to be movable in the cylinder direction. I have. The plunger 8a has a holder 8b
Similarly, a rod housing portion 8a1 formed in a cylindrical shape from the discharge nozzle 28 side toward the switch 9 is formed, and a rod 8e is housed in the rod housing portion 8a1 via a second return spring 8f. I have.

In the gauge 8, a mark written on the plunger 8 a and a gauge 15 a of the gauge display section 15 of the case 2 are displayed.
The discharge pressure of the pump section 3 can be recognized by looking at. In the gauge 8, when the switch 9 is turned on to increase the pressure in the discharge nozzle 28, the plunger 8a moves in the holder 8b toward the switch 9 against the first return spring 8d. And plunger 8
The rod 8e also protrudes toward the switch 9 together with a, and the rod 8e is inserted into the rod insertion hole 9c1 of the switch 9. When the pressure in the discharge nozzle 28 exceeds a predetermined value, the tip of the rod 8e is
6C, the operation knob 9a is pressed against the side of the operation knob 9a in the rotation direction by contacting the side of the operation knob 9a in the rotation direction.
It has the function of forcibly turning in the counter-clockwise direction to switch off. In this gauge 8, since only the rod 8e, which is a means for automatically turning off the switch 9, is connected to the plunger 8a, which is means for confirming the discharge pressure, the switch 9 is automatically turned off. Means are obtained in a very simple manner.

In the pump section 3 and the motor section 4 housed in the pump accommodating section 20, the motor yoke 4a of the motor section 4 is disposed closer to the partition plate 17, and the cylinder 23 of the pump section 3 is closer to the air discharge ports 10 and 11. Are located in for that reason,
In the pump housing section 20, as shown in FIG.
7 through the ventilation passage 35 between the motor yoke abutment projections 20a1 and 20b1 outside the motor yoke 4a, through the outside of the cylinder 23 of the pump unit 3, and to the air discharge ports 10 and 11. A space 36 is formed. This space 36 is formed by the rotation of the armature shaft 4b of the motor unit 4 and the rotation of the fan 5
A negative pressure is generated in the pump housing 20, and the air introduced into the pump housing 20 through the slit 19 of the partition plate 17 is directed from the motor yoke 4 a side of the motor unit 4 to the cylinder 23 of the pump unit. And has a function of forcibly cooling the cylinder 23 of the pump unit 3 by flowing the air. Since the cylinder 23 of the pump unit 3 is forcibly cooled by the rotation of the fan 5, it can be used for a long time.

The power cord 7 has a part drawn from the switch 9 and a part drawn from the motor yoke 4a inserted into the member accommodating portion 18. The other end of the power cord 7 has a cigar lighter of the vehicle. A plug (not shown) inserted into the socket is electrically connected.

The hose 6 is fastened to the discharge nozzle 28 by a clamp 37, and is drawn out through the cylindrical portion of the handle 14 into the member accommodating portion 18. A nozzle (not shown) is attached to the other end of the hose 6. Nozzles for car tires, bicycle tires,
Plastic boats, air mats, and balls are available, and can be appropriately changed according to the application.

When the portable electric air pump 1 having such a structure is not used, the power cord 7 and the hose 6 are accommodated in the member accommodating portion 18 and are carried by holding the handle 14 by hand. Then, at the time of use, the power cord 7 and the hose 6 are pulled out from the member accommodating portion 18, the plug of the power cord 7 is inserted into the cigarette lighter socket of the vehicle, and the nozzle of the hose 6 is connected to the air-filled object.

When the operation knob 9a of the switch 9 is turned on, the power cord 7 is switched to the conductive state.
The armature shaft 4b of the motor unit 4 starts rotating, and the rotational force of the armature shaft 4b is applied to the eccentric member 30 of the pump unit 3 to rotate the eccentric member 30. When the eccentric member 30 rotates, the eccentric shaft 30b rotates eccentrically to the armature shaft 4b.
The rotation of b is converted into a reciprocating movement of the piston body 29 in the liner 31. When the piston body 29 reciprocates in the liner 31, air is sucked from the suction nozzle 27 through the suction valve 25, while the discharge valve 2
Air is supplied into the hose 6 from the discharge nozzle 28 through the nozzle 6, and air is supplied from the nozzle of the hose 6 to an object to be filled with air. While the air is being supplied to the object, the position of the mark of the plunger 8a on the gauge display unit 15 of the case 2 corresponding to the burrs 15a is recognized as the value of the discharge pressure.

When the armature shaft 4b of the motor section 4 rotates, the fan 5 rotates, so that a negative pressure is generated in the pump housing section 20. At this time, since the power cord 7 and the hose 6 have already been taken out, the member accommodating portion 18 is a space, so the member accommodating portion 18 is separated from the air accommodating portion 12 through the air inlet 12 of the first side plate 2e. 1
The slits 19 of the partition plate 17 that are arranged deeply through 8
The air outside the case 2 is introduced into the pump housing portion 20 through the inside, and the air introduced into the pump housing portion 20 through the slit 19 of the partition plate 17 is supplied to the motor yoke contact protrusion 2.
After flowing through the space 36 from the motor yoke 4a side of the motor section 4 toward the cylinder 23 of the pump section 3 through the ventilation flow path 35 between 0a1 and 20b1, air is discharged outside the cylinder 23 of the pump section 3. Case 2 from exits 10 and 11
Is discharged outside.

During the reciprocation of the piston body 29 in the liner 31, the vibration component of the eccentric member 30 in the radial direction of the motor yoke 4 a corresponding to the cylinder direction of the liner 31 is included in the vibration generated by the pump unit 3. The vibration component of the motor yoke 4a in the cylinder direction, which is attenuated by the balance weight and corresponds to the radial direction of the liner 31, is
a, but the motor yoke contact protrusion 20a of the case 2
The vibration components are not transmitted to the case 2 because the motor yokes 4a and 1b support the motor yoke 4a in the cylinder direction.

When the pressure in the discharge nozzle 28 exceeds a predetermined value due to the operation of the pump section 3, the distal end of the rod 8e moves in the switch case 9c in the direction of rotation of the operation knob 9a. 6, the operation knob 9a is pressed in the turning direction, and the operation knob 9a is forcibly turned counterclockwise in FIG.
Is automatically switched off, so that the pump unit 3
Does not stop, and the pressure in the discharge nozzle 28 does not increase beyond a predetermined value.

FIG. 7 shows a second embodiment of the portable electric air pump according to the present invention, in which only a sectional view around the gauge 8 is shown, and other portions are the same as in the first embodiment. Has become.

In this case, the gauge 8 includes a plunger 8
a, holder 8b, communication member 8c, first return spring 8d,
Rod 8e, second return spring 8f, discharge pressure adjusting member 8
h are provided respectively.

The communicating member 8c has a discharge nozzle 28 on one side.
And the other side is connected to the inside of the holder 8b. The holder 8b is provided with the discharge nozzle 28
The plunger 8a to which the O-ring (O-ring) 8g is attached is held via a first return spring 8d housed inside so as to be movable in the cylinder direction. I have. The plunger 8a has a holder 8b
Similarly, a rod housing portion 8a1 formed in a cylindrical shape from the discharge nozzle 28 side toward the switch 9 is formed, and a rod 8e is housed in the rod housing portion 8a1 via a second return spring 8f. I have. The discharge pressure adjusting member 8h is connected to the tip of the rod 8e.

In the gauge 8 in this case, four recessed locking holes 8e1, 8e2, 8 are formed at the tip of the rod 8e.
e3 and 8e4 are formed apart from each other along the length direction, and the gauge display section 16 of the case 2 is formed in a hole shape. Locking holes 8e1, 8e2, 8e of rod 8e
3, 8e4 is not limited to four places.

The discharge pressure adjusting member 8h is formed of an elastic resin material, and the tip of the discharge pressure adjusting member 8h has a rod insertion hole 9c1 of the switch 9.
A rod extension 8h1 inserted into the rod extension 8h1, a rod fitting 8h2 formed in a cylindrical shape at the base end of the rod extension 8h1 and fitted to the distal end of the rod 8e, and above the rod fitting 8h2. A gauge knob 8h3 which is formed in a tongue shape on the side so as to be separable from the rod fitting portion and which is inserted into the gauge display portion 16 of the case 2 and protrudes to the outside, and a projection formed on the opposite side of the gauge knob 8h3. The formed hook 8h4 is provided.

In the gauge 8 in this case, the gauge knob 8h3 projecting outward from the gauge display portion 16 of the case 2
And lock holes 8e1, 8e2, 8e of rod 8e.
By selecting one of 3, 8e4 and inserting the hook 8h4, the entire length of the rod 8e including the length of the rod extension 8h1 is appropriately changed. When the locking hole 8e4 near the distal end of the rod 8e is selected, the overall length of the rod 8e becomes longer. On the contrary, when the locking hole 8e1 opposite to the distal end of the rod 8e is selected, the rod 8e is set. Becomes shorter.

In this case, when the pressure in the discharge nozzle 28 increases due to the switch 9 being turned on, the plunger 8a moves the inside of the holder 8b toward the switch 9 against the first return spring 8d. The rod 8e projects to the switch 9 side together with the plunger 8a, and the discharge pressure adjusting member 8h moves together with the rod 8e to the switch 9 side.
And the rod extension portion 8 of the discharge pressure adjusting member 8h.
h1 is inserted into the rod insertion hole 9c1 of the switch 9. When the pressure in the discharge nozzle 28 exceeds a predetermined value, the distal end of the rod extension 8h1 contacts the side of the operation knob 9a in the rotation direction in the switch case 9c and turns the operation knob 9a. Operation knob 9 for pressing in the moving direction
a forcibly turning counterclockwise in FIG. 6 to switch off. In the gauge 8 in this case, the pressure at which the switch 9 is turned off is appropriately changed by the discharge pressure adjusting member 8h in accordance with the applied pressure of the object into which the air is put.

[0062]

As described above, according to the portable electric air pump according to the first aspect of the present invention, when the discharge pressure of the pump section is increased as a result of continuous operation, the gauge is operated. Automatically switches off the switch. Therefore, since the operation is not performed beyond the allowable time, there is an excellent effect that the durability is improved.

According to the portable electric air pump according to the second aspect of the present invention, when the pump section is operated, the pressure in the holder increases, and the rod connected to the plunger projects toward the switch. Then, when the discharge pressure of the pump unit increases due to the continuous operation of the pump unit, the rod presses the operation knob of the switch to switch off the switch. Therefore, in addition to the effect of the first aspect, since the means for switching off the switch need only be the plunger and the rod, an excellent effect that the structure becomes extremely simple is obtained.

According to the portable electric air pump according to the third aspect of the present invention, when the discharge pressure adjusting member is connected to a predetermined position in the axial direction of the plunger and the pump section operates, the pressure in the holder is reduced. As a result, the member for adjusting the discharge pressure projects together with the rod of the plunger toward the switch. Then, when the discharge pressure of the pump section increases due to the continuous operation of the pump section, the discharge pressure adjusting member presses the operation knob of the switch to switch off the switch. Therefore, in addition to the effect of the first aspect, the pressure at which the switch is turned off is appropriately changed depending on the coupling position of the discharge pressure adjusting member to the plunger.

According to the portable electric air pump according to the fourth aspect of the present invention, since the space is formed between the air intake and the partition plate, the first and second external connection members are not used. Sometimes it is contained in that space. In addition, when the rotating blades are rotated by the rotation of the motor unit, a greater negative pressure is generated on the slit side of the partition plate, so that air is efficiently taken from the air intake into the pump housing in the case, and It is discharged from the outlet. Therefore, Claim 1,
In addition to the effects of the above two and three, excellent accommodation that the accommodation space for the first and second external connection members is ensured, and the motor part and the pump part are forcibly cooled and can withstand continuous operation. It works.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an internal mechanism of a first embodiment of a portable electric air pump according to the present invention.

FIG. 2 is a front view of the portable electric air pump shown in FIG.

FIG. 3 is a plan view of the portable electric air pump shown in FIG.

FIG. 4 is a right side view of the portable electric air pump shown in FIG.

FIG. 5 is a longitudinal sectional view of the portable electric air pump shown in FIG.

6 is a cross-sectional view illustrating a gauge in the portable electric air pump shown in FIG.

FIG. 7 is a sectional view illustrating a gauge of a second embodiment of the portable electric air pump according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable electric air pump 2 Case 3 Pump part 4 Motor part 5 Rotor blade 6 (1st external connection member) Hose 7 (2nd external connection member) Power cord 8 Gauge 8a Plunger 8b Holder 8e Rod 8h Discharge pressure adjustment Member 9 Switch 9a Operating knob 10 Air outlet 11 Air outlet 12 Air inlet 17 Separator 19 Slit 20 Pump housing 27 (Fluid suction unit) Suction nozzle 28 (Fluid discharge unit) Discharge nozzle

Claims (4)

[Claims] 1. A case, an air inlet disposed on one side of the case, an air outlet disposed on the other side of the case, a pump housing formed in the case, and the pump A motor unit that is disposed in the housing unit and generates a rotational force when energized; a switch electrically connected between the motor unit and a power supply; a fluid suction unit and a fluid discharge unit formed to form the pump housing A pump unit disposed on an air discharge port side of the unit and configured to discharge fluid sucked from the fluid suction unit from the fluid discharge unit by a rotational force applied from the motor unit, and to a fluid discharge unit of the pump unit A gauge connected to display the discharge pressure of the pump unit, and capable of switching off the switch when the discharge pressure of the pump unit exceeds a predetermined value; and an air intake side of the pump housing unit. It is arranged, coupled to said motor unit, a portable electric air pump in the air sucked from the inlet the air by the rotation of the motor unit, characterized in that it comprises a rotary blade for discharging from the air discharge port. 2. The gauge has a holder connected to a fluid discharge portion of the pump portion, a holder having a predetermined length, movably supported in the holder, and a discharge pressure of the pump portion. A plunger protruding from the holder toward the switch when it becomes larger is provided with a rod coupled to the plunger. The switch is pressed by the rod,
The portable electric air pump according to claim 1, further comprising an operation knob that is turned off. 3. A holder connected to the fluid discharge portion of the pump portion, the holder being movably supported in the holder, and protruding from the holder toward the switch when the discharge pressure of the pump portion increases. A plunger, a rod connected to the plunger, and a discharge pressure adjusting member capable of changing the length of the rod by being gradually switched in the axial direction of the rod. The portable electric air pump according to claim 1, further comprising an operation knob that is turned off by being pressed by the discharge pressure adjusting member. 4. A fluid discharge part of the pump part is connected to the fluid discharge part,
A first external connection member drawn out of the case from the air intake; a second external connection member electrically connected to the motor unit and drawn out of the case from the air intake; an air intake of the case; The partition plate formed at a position recessed from the air inlet, and a slit formed in the partition plate so as to communicate with the inside of the pump housing from the air intake port. Portable electric air pump.