JPH0417814Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a starting device for a reciprocating pump directly connected to a motor, which is used, for example, in a power sprayer for spraying chemicals.

[Prior Art] In order to reduce the load on the motor at the time of starting a direct-coupled reciprocating pump, a conventional device is provided with a clutch device between the output shaft of the motor and the drive shaft of the reciprocating pump. However, the clutch device has the disadvantage that compactness is hindered.

``Problems to be solved by the invention'' Therefore, in the earlier Japanese Patent Application No. 60-194822 (Japanese Unexamined Patent Publication No. 62-55473) (filed on September 5, 1985), the applicant proposed The present invention provides a device that can be made more compact by switching the position of the piston rod closer to the cam so that power is transmitted to the base end or is cut off.

However, this is inconvenient because it is necessary to separately change the position of the piston rod and the operation of the motor.

The purpose of this invention is to start a reciprocating pump directly connected to a motor, which can be made compact, operate the motor continuously with the intermittent transmission of power from the cam to the piston rod, and thereby perform light-load starting. The purpose is to provide equipment.

[Means for Solving the Problem] According to this invention, in a motor-directly connected reciprocating pump in which a reciprocating piston rod is connected to the output shaft of a motor via a cam, the piston rod is urged toward the cam. A spring, a guide member connected to the piston rod via a connecting arm, a convex member that can come into contact with the end face of the guide member and limit movement of the piston rod toward the cam, and a convex member that restricts movement of the piston rod toward the cam. It consists of a switch to control, a contact to operate the switch, a handle that rotates integrally with the convex member, and a raised part arranged on the side edge of the handle so that the contact can be operated. When the rotation angle of the handle exceeds the first rotation angle due to the operation on the contactor, the motor becomes activated, and when the rotation angle exceeds the first rotation angle, the motor becomes in a position where it can follow the movement of the piston rod cam. ing.

[Effect]

The handle is manually operated by the operator, and the operating state of the motor is determined by the handle's operation of a contactor, and power transmission from the cam to the piston rod is interrupted or interrupted by the operation of a guide member by a convex member that rotates integrally with the handle. It's decided.

When the handle is above the first rotation angle and below the second rotation angle, the piston rod is restricted from moving toward the cam, so power transmission is cut off, and the load on the motor is reduced. The motor switch is operated via the contacts, and the motor is activated. This results in the motor operating at a light load.

When the handle is rotated beyond the second rotation angle, power is transmitted from the cam to the piston rod, causing the piston rod to reciprocate.

〔Example〕

An embodiment of this invention will be described below based on the accompanying drawings.

1 and 2 are overall sectional views of the reciprocating pump in different states of this devised device. A cylindrical cylinder 2 is attached to the tip of the crankcase 1, and a discharge valve is attached to the tip of the cylinder 2. A cylinder head 5 having a cylinder head 3 and a discharge port 4 is mounted, and a reciprocating piston 6 and a suction valve 7 are arranged within the cylinder 2. Crankcase 1 and cylinder 2
A suction port 8 is formed at the connection portion with the suction port 8.
communicates with the suction valve 7. A contact member 18 is integrally fixed to the base end of the piston rod 12, and the piston 6 is attached to the tip with a nut 13, and is slid onto the tip of the crankcase 1 via seal members 14, 14. Ru. Output shaft 1 of motor (not shown)
5 is pivotally supported by the crankcase 1, and an eccentric cam 16
is attached and fixed to the outer periphery of the output shaft 15. The metal member 17 has a regular hexagonal outer ring portion, is fitted to the outer periphery of the eccentric cam 16 so as to be relatively rotatable, and is capable of moving toward and away from the contact member 18 at the base end of the piston rod 12 . The connecting arm 22 is fixed to the base end of the piston rod 12, extends around the metal member 17, and is connected to the piston rod 12 and the guide member 23 at both ends, respectively. The compression coil spring 24 is compressed between the inner wall of the crankcase 1 and the connecting arm 22, and biases the piston rod 12 toward the eccentric cam 16. The guide member 23 is guided in the axial direction of the piston rod 12 by the guide part 25 of the crankcase 1, and the convex member 26 is guided by the guide part 25 of the crankcase 1.
5 and is fitted.

To explain the relationship between the metal member 17 and the connecting arm 22, the connecting arm 22 is integrated with the piston rod 12, the abutment member 18, and the guide member 23, and the spring 2
4, it is constantly pushed in the direction of the output shaft 15. The metal member 17 is in contact with the abutting member 18 and the cam 1
As shown in FIG. 2, vertical sliding contact is made by the displacement caused by the rotation of 6.

Next, regarding the installation mode of the metal member 17, the cam 16 is fixed to the output shaft 15 with a key, and
, the cam 16 is rotated eccentrically by the displacement of the cam 16. The outer periphery of the cam 16 and the inner periphery of the metal member 17 form a sliding bearing structure. This metal member 17 is simply inserted into the cam 16 in the axial direction, and a stopper (not shown) is attached to the side surface to prevent it from coming off the cam 16. Further, the metal member 1
7 is in a free state, the outer periphery of the metal member 17 is made into a polygonal shape, and the flat surface of the metal member 17 is brought into surface contact with the abutting member 18 to prevent rotation of the metal member 17 and to reduce the amount of eccentricity of the cam 16. Slide it.

The state in which the high flat part of the guide member 23 and the protrusion 30 of the convex member 26 are in contact is the clutch ON state, and the integrated piston rod 12 has a length equal to or greater than 1/2 of the cam stroke. is moved toward the top dead center against the compression coil spring 24. At this time, the abutting member 18 and the metal member 17 are separated, and the cam stroke is not transmitted to the piston rod 12 even if the motor rotates.

Note that FIG. 9 is an explanatory diagram showing the relationship of each part when the clutch is ON, and FIG. 10 is an explanatory diagram showing the relationship of each part when the clutch is moved over a full stroke.

3 and 4 show the shapes of the contact portions of the guide member 23 and the convex member 26, respectively. The contact end surface of the guide member 23 has a high flat part 27, a low flat part 28, and an inclined part 29 at the periphery, and the convex member 26 has a protrusion 30.

Returning to FIGS. 1 and 2, an O-ring 34 is provided on the shaft of the convex member 26, and the handle 35 is
The nut 36 is disposed outside the crankcase 1.
is fixed to the end of the shaft portion of the convex member 26, and rotates integrally with the convex member 26. Micro switch 37
is the crankcase 1 near the handle 35.
It has terminals 38 and 39 connected to a motor (not shown) and a power source, and has a contact 45 protruding toward the handle 35 for switching on and off. Handle 35 is micro switch 3
It has a raised portion 46 that can come into contact with the contactor 45 on the surface on the 7 side.

5a and 5b are a front view and a sectional view from the side of the assembly consisting of the convex member 26 and the handle 35. FIG. The raised portion 46 of a constant height is formed at an appropriate angle considering the operation of the motor and the operation of the pump, here approximately.
It extends circumferentially over a range of 260°, and the protrusion 3
0 is formed in such a position that the pump is still in a stopped state when the motor starts to start due to the contact between the raised portion 46 and the contact 45 of the micro switch 37. When the tip of the contact 45 is in contact with the raised portion 46, the contact 45 is pushed toward the micro switch 37 to turn on the micro switch 37, thereby putting the motor into operation.
Further, when the protrusion 30 is in contact with the high flat part 27 of the guide member 23, the guide member 23 is in contact with the eccentric cam 16.
The contact member 18 moves away from the metal member 17 and the eccentric cam 1
6 to the piston rod 12 is suddenly cut off.

6 and 7 show the guide member 23 and the convex member 26.
and a raised part 46 on the back side of the handle 35 and a contact 45 of the micro switch 37 for the raised part 46.
FIG.

FIG. 6 shows a side view during operation, in which the contactor 45 is in contact with the protrusion 46, the motor is turned on, the guide member 23 and the convex member 26 are not in contact, and therefore the guide The contact member 18, which is movable integrally with the member 23, is pressed against the metal member 17 by the compression coil spring 24 and is in contact with the metal member 17, and the power from the output shaft 15 of the motor is transmitted via the eccentric cam 16, the metal member 17, etc. It is transmitted to the piston rod 12 and the reciprocating pump is in operation.

FIG. 7 shows a view taken along the arrow in FIG. 6, and shows the operating states of the motor and pump at each rotational position of the handle 35.

The handle 35 is operated clockwise, and Fig. 7 a, b, c, d, and e are respectively when the pump is running (motor on, the contact member 18 and metal member 17 are in contact) and when the pump is stopped. (Motor off,
The abutting member 18 and the metal member 17 are separated, the motor and pump stop at almost the same time), the pump operation is stopped (the motor is off, the abutting member 18 and the metal member 17
When the motor starts (motor on, contact member 18 and metal member 17 are separated, pump stops) and pump operation starts (motor on, contact member 18 and metal member 17 complete contact) ) is shown.

Now, if the rotation angle is 0° in the state shown in FIG. is pressed and abutted against the metal member 17 by the compression coil spring 24, so the piston rod 1
The force is transmitted to 2 and the pump operates. Rotation angle approx.
At 90°, the protrusion 30 of the convex member 26 is on the inclined part 29 toward the high flat part 27, and the abutment member 18, which is movable integrally with the guide member 23, resists the pressing force of the compression coil spring 24. The pump is separated from the metal member 17 to stop the pump, and the raised part 46 on the back of the handle 35 and the micro switch 37 are
The contact with the contact 45 is released, and the motor is turned off (FIG. 7b). At the position further rotated by 90 degrees, the protrusion 30 of the convex member 26 and the high flat part 27 of the guide member 23 are in contact with each other, and both the motor and the pump are stopped, and this is the first rotation described above. It corresponds to the corner (Fig. 7c).

Next, the handle 35 is rotated by an appropriate angle, and when the rotation angle corresponds to the above-mentioned first rotation angle or more, the protrusion 30 of the convex member 26 comes into contact near the high flat part of the guide member 23,
The protrusion 46 on the back surface of the handle 35 and the contact 45 of the micro switch 37 come into contact with each other while maintaining the separation between the contact member 18 and the metal member 17, and the motor is turned on and the no-load operating state of the motor is achieved. (Figure 7d).

Further, when the protrusion 30 of the convex member 26 abuts the inclined portion 29 of the guide member 23 toward the lower flat portion 28, the abutting member 18, which is movable in the axial direction integrally with the guide member 23, is moved by the compression coil. While being pressed by the spring 24, the gap between the metal member 17 and the metal member 17 is reduced, and the contact is eventually completed. At this time, the motor remains on and the pump is in operation, and this time corresponds to the second rotation angle described above (FIG. 7e).

As described above, by rotating the handle, the pump operating state (0°) → pump stopped state (approximately 90°) → pump stopped state (180°) → motor no-load operating state (180°)
+α) → Pump operating state (approximately 270°) can be repeatedly created.

FIG. 8 shows the operational relationship between the motor and the pump with respect to the rotation angle of the handle 35. Here the rotation angle
The no-load state of the motor is shown in which only the motor is turned on from 180°+α to approximately 270°.

As mentioned above, since the no-load operation state of the motor is ensured, even if the voltage drops due to a location with low voltage or a long power cord, for example,
This has the effect of making it easier to start up the motor-directly connected reciprocating pump.

[Effect of idea]

By restricting the movement of the piston rod toward the cam, power transmission to the piston rod can be switched on and off, so that a large-scale clutch device can be omitted and the starter device can be made more compact.

Operation of the motor and on/off of power transmission to the piston rod are controlled simply by operating the handle, making the operation extremely simple. Even under low voltage, the motor can be started easily because it is in a no-load operating state.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the entire pump device in a state where the motor is operating and the pump is stopped, and a state where the piston rod of the pump in operation is at the top dead center, respectively, and Figures 3a and b are a front view and a side view of the end of the guide member on the convex member side, FIGS. 4a, b,
c is a front view, side view, and bottom view of the end of the convex member on the guide member side; FIG. 5 is a front view and a sectional view seen from the side of the assembly consisting of the convex member and the handle;
Fig. 7 is a schematic diagram showing the relationship between the guide member, the convex member, the raised part on the back of the handle, and the contact, Fig. 7a
is when the pump is running, b and c are when the pump is stopped, and d
Fig. 8 shows the relationship between the rotation angle of the handle and each parameter. Fig. 9 and Fig. 10 show the graph when the clutch is ON and the full stroke. FIG. 6... Piston, 15... Output shaft, 16... Eccentric cam, 22... Connecting arm, 23... Guide member, 2
4... Compression coil spring, 26... Convex member, 35...
...Handle, 37...Micro switch, 45...
...Contactor, 46...Protuberance.

Claims (1)

[Scope of utility model registration request] In a motor-directly connected reciprocating pump in which a reciprocating piston rod is connected to the output shaft of a motor via a cam, a spring 24 biases the piston rod 12 toward the cam 16, and a spring 24 biases the piston rod 12 toward the cam 16; a guide member 23 connected to the piston rod 12; a convex member 26 that can come into contact with the end surface of the guide member 23 and restricts movement of the piston rod 12 toward the cam 16; and an operation of the motor. a switch 37 for controlling the switch 37, a contact 45 for operating the switch 37, a handle 35 that rotates integrally with the convex member 26, and a handle 35 arranged on the side edge of the handle 35 so that the contact 45 can be operated. When the contactor 45 of the raised part 46 is operated, the motor becomes activated when the rotation angle of the handle 35 exceeds the first rotation angle, and a second rotation angle larger than the first rotation angle is activated. The guide member 23 and the convex member 2 are arranged so that the piston rod 12 is in a position where it can follow the movement of the cam 16 when the rotation angle is exceeded.
6. A starting device for a reciprocating pump directly connected to a motor, characterized in that the shape of the contact portion with the motor is defined.