JPS6246703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a small reciprocating pump used in an automobile headlamp cleaning device or an air pump for filling air into tires.

Conventionally, this type of fluid pressure pump has
A vane pump or a small single-cylinder reciprocating pump such as that disclosed in Japanese Utility Model Publication No. 51-49269 is used. FIG. 1 is an explanatory diagram of a conventional reciprocating pump. When a motor 2 is rotated by electric power from a battery 1, a crank 4, which is attached to a rotating shaft 3 and has a balance weight 6 fixed thereto, rotates. A connecting rod 8 is rotatably connected to a crank pin 5 fixed at a position apart from the center of rotation of the crank 4 via a bearing 7, so that when the motor 2 rotates, the connecting rod 8 is moved up and down. The upper end of this connecting rod 8 is connected to the lower end of the piston 10 via a rotatable pin 9, so when the connecting rod 8 goes up and down, the piston 1
0 reciprocates within the cylinder 12. At this time, the piston ring 11 of the piston 10 slides on the inner surface of the cylinder 12 to maintain airtightness. piston 10
When the piston 10 rises, the suction valve 13 is closed and the discharge valve 14 is opened to send the fluid in the cylinder 12 to the discharge pipe 16. When the piston 10 is lowered, the suction valve 13 is opened and the discharge valve 14 is closed, and the fluid inside the suction pipe 15 is sent. of fluid is sucked into the cylinder 12. Therefore, every time the motor 2 rotates, fluid is sucked in and discharged, and the discharge pipe 1 is intermittently
6.

In conventional reciprocating pumps that operate in this manner, the rotational motion of the motor 2 is converted into linear reciprocating motion of the piston 10, so the connecting parts are prone to wear and generate noise and vibration, causing discomfort to the user. was giving.
Furthermore, since the moving member repeatedly moves at high speed and then stops and moves backwards, the overall durability is poor, and the number of parts is large, resulting in high costs.

The object of the present invention is to provide a reciprocating pump with a small and inexpensive configuration and low vibration and noise.The present invention is characterized by a reciprocating rod having a piston fixed to its tip, and a reciprocating rod that crosses this reciprocating rod. A worm wheel has a groove-like body firmly fixed in place, a worm wheel has a pin fitted into the groove of this groove-like body fixed at a position away from the center of rotation, and the reciprocating rod engages with the worm wheel to rotate the motor in parallel. It is equipped with a worm gear attached to a shaft, and is configured so that the motor rotates in one direction, causing the piston to reciprocate.

FIG. 2 is a perspective view of a reciprocating pump that is an embodiment of the present invention. A motor 2 is rotated by electric power from a battery 1, and the rotation is transmitted to a gear mechanism in a case 17 and converted into reciprocating linear motion of a reciprocating rod 20. The reciprocating rod 20 is supported by a groove 19 in a lid 18 attached to the case 17, and a piston 10 fixed to the tip thereof reciprocates within the cylinder 12 to forcefully feed fluid sucked in from the suction pipe 15 to the discharge pipe 16. . Note that an automatic return switch 21 is provided in the circuit connecting the battery 1 and the motor 2, and when this switch is pressed momentarily, the piston 10
makes one round trip and then stops.

3 is a perspective view of the piston moving mechanism inside the case of FIG. 2. FIG. When the worm gear 25 attached to the rotating shaft of the motor 2 rotates, the worm wheel 23 meshed with it rotates at a reduced speed. A pin 24 protruding and fixed at a position away from the center of rotation on the upper surface of the worm wheel 23 fits into a groove in the groove-shaped body 22, and since this groove-shaped body 22 is fixed at right angles to the reciprocating rod 20, the worm wheel The reciprocating rod 20 is reciprocated once every time 23 rotates once. That is,
The rotational force of the motor 2 is decelerated through a toothed wheel mechanism.
The piston 10 is reciprocated with strong force.

FIG. 4 is a vertical sectional view of the case including the cylinder and reciprocating rod shown in FIG. 2, and the same parts as in FIGS. 2 and 3 are given the same reference numerals. When the worm gear 25 attached to the rotating shaft of the motor 2 rotates the worm wheel 23, the pin 24 fixed to the worm wheel 23 with a rivet 26 moves the grooved body 22 from side to side, causing the piston 10 to reciprocate together with the grooved body 22. make it move. The bottom of the cylinder 12 facing the piston 10 has a hole that communicates with the suction pipe 15 and the discharge pipe 16, and the suction valve 13 and the discharge valve 14 are installed in these holes, respectively, so that the worm wheel 23 rotates once. The fluid in the cylinder 12 is discharged every time. A conductive disc 27 is attached to the lower surface of the worm wheel 23 via an insulating plate 28, and the conductive disc 27 is connected to the power circuit of the motor 2.

FIG. 5 is a motor power supply circuit diagram. Conductive disk 2
7 is provided on one surface of the worm wheel 23 and rotates together with the worm wheel 23.
In other words, the conductive disk 27 rotates in conjunction with the motor 2. This conductive disk 27 has an annular conductive portion 30 formed on an insulating plate 28 , and a portion of the conductive portion 30 is cut out to form a ground portion 29 . A contact piece 32 is attached to the grounding part 29, and a contact piece 31 is attached to the conductive part 30.
are in contact with each other, and the contact piece 31 is connected to the battery 1 and the terminal 34 of the automatic return type switch 21.

Further, the contact piece 32 is connected to a terminal 35 of the automatic return type switch 21. Automatic return type switch 2
1 has a moving element 33, and the driving state of the motor 2 changes depending on the connection state of this moving element 33.

When the mover 33 of the automatic return type switch 21 is connected to the terminal 35 as shown in the figure and the contact pieces 31 and 32 are not in a conductive state, the motor 2 does not rotate. If the switch is pressed and the slider 33 is kept in contact with the terminal 34, the motor 2 will continue to rotate many times, but when the slider 33 is separated from the terminal 34 and comes into contact with the terminal 35, the conductive disc 27 will turn as shown in the figure. It rotates until it reaches the desired condition and then stops. That is, the motor 2 rotates while the contact pieces 31 and 32 are in contact with the conductive part 30, but when the contact piece 32 comes into contact with the grounding part 29, the motor 2 stops. Therefore, when the automatic return type switch 21 is pressed momentarily, the conductive disc 27 rotates once and then stops. Note that one terminal 2a of the motor 2 is connected to the movable piece 3.
3, and the other terminal 2b is grounded.

The reciprocating pump configured in this manner, for example, sprays out a fixed amount of cleaning liquid and automatically stops at the reference position simply by momentarily pressing the automatic return switch 21, so that it does not interfere with the next operation. Also,
To operate the reciprocating pump for a long time, it is sufficient to keep pressing the automatic return switch 21, but if you stop pressing it, it will automatically stop at the reference position. This stop position can be made to coincide with the dead center position of the piston 10 by selecting the attachment positional relationship between the pin 24 and the conductive disc 27.

As mentioned in the explanation of FIGS. 2 to 4, the gear mechanism that transmits the rotational force of the motor 2 to the piston 10 uses the worm wheel 23 and the worm gear 25, so it can be housed in the small case 17. Since the direction of the rotation axis of the motor 2 and the reciprocating rod 20 are parallel to each other, the entire reciprocating pump is constructed to be compact. Further, since the rotational force of the motor 2 only causes the worm wheel 23 to rotate at a reduced speed in one direction, the rotation is smooth with little noise. Further, since the oil-impregnated alloy surface of the pin 24 is in contact with the groove of the grooved body 22, the mechanism that converts rotational motion into linear reciprocating motion operates smoothly, and noise and vibration are significantly reduced. Therefore, these mechanisms are durable and the fluid output remains constant over long periods of time.

As described above, the reciprocating pump of this embodiment uses a mechanism that converts the rotational force of the motor into reciprocating motion of the piston in the same direction as the motor rotation axis, so it can be constructed compactly and has the effect of reducing vibration and noise. There is.

The motor 2 used in the above embodiment is a DC motor that rotates at high speed, and is relatively small and inexpensive. However, since the rotation of the motor is decelerated by the worm gear and worm wheel mechanism, a large piston driving force is generated, and since the piston moves at a slow speed, its inertia is small and the reciprocating motion is smooth and powerful. It has

The reciprocating pump of the present invention has the advantage of being small and inexpensive, operating smoothly and with high precision with little vibration and noise, and uses dynamic braking to maintain the piston stroke at a predetermined position, either top dead center or bottom dead center. Since it stops, it becomes possible to inhale and dispense a fixed amount of liquid.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional reciprocating pump, FIG. 2 is a perspective view of a reciprocating pump that is an embodiment of the present invention, and FIG. 3 is a perspective view of a piston moving mechanism in the case of FIG. FIG. 4 is a vertical sectional view of the case including the cylinder and reciprocating rod shown in FIG. 2, and FIG. 5 is a power supply circuit diagram of the motor. 1...Battery, 2...Motor, 10...Piston,
11... Piston ring, 12... Cylinder, 13...
Suction valve, 14...Discharge valve, 17...Case,
18... Lid, 20... Reciprocating rod, 21... Automatic return type switch, 22... Groove-shaped body, 23... Worm wheel, 24... Pin, 25... Worm gear, 26... Rivet, 27... Conductive disk, 28... Insulating plate , 29...
Grounding part, 30... Conductive part, 31, 32... Contact piece, 33
...Mover, 34, 35...Terminal.

Claims (1)

[Claims] 1. A pump part consisting of a cylinder with a suction valve and a discharge valve attached to the bottom, a piston inserted into the cylinder and reciprocating, a reciprocating rod with the piston fixed to its tip, and a reciprocating rod that intersects with the reciprocating rod. A worm wheel having a groove-like body firmly fixed thereto, a worm wheel having a pin fitted in the groove of the groove-like body installed at a position apart from the center of rotation, and the worm wheel meshing with the worm wheel through a worm gear. In the reciprocating pump, the reciprocating pump is composed of a drive mechanism section consisting of a motor that provides rotational force to the worm wheel, and that rotates the motor in one direction to reciprocate the piston. A pair of grounding part and a conductive part are fixed through an object, and the grounding part and the conductive part are electrically disconnected near the top dead center or bottom dead center of the stroke of the piston, and the conductive part is connected to the grounding part and the conductive part by other means. A reciprocating pump characterized by comprising a pair of contact pieces electrically connected through the contact piece, and a normally open automatic return switch connected between the contact piece and a motor terminal and automatically reset.