JPH0612767U - Reciprocating pump drive - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a drive device that does not require an air switching valve that is prone to failure. [Structure] The drive magnet plate 5 fixed to the output rotary shaft 4 of the motor 3 rotates, and each magnetic pole S, N thereof is prevented from rotating at the projecting end of the operating rod 7 of the plunger pump 1 to move only in the axial direction. The magnetic poles S, N of the driven magnet plate 8 fixed freely
When the same poles are used as shown in (A) and (A), both magnet plates 5,
A magnetic repulsive force is generated between the moving magnet plate 8 and the driven magnet plate 8 to move away from the driving magnet plate 5. Next, as shown in (B), the magnetic poles S and N of the drive magnet plate 5 are the magnetic poles S and N of the driven magnet plate 8, respectively.
If the poles opposite to N correspond, a magnetic attraction force is generated between the magnet plates 5 and 8, and the driven magnet plate 8 moves in a direction approaching the driving magnet plate 5. This operation is repeated with the rotation of the drive magnet plate 5, and the plunger of the plunger pump 1 is reciprocally driven via the operating rod 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive device for a reciprocating pump such as a plunger pump or a diaphragm pump.

[0002]

[Prior art]

 Conventionally, reciprocating pumps such as plunger pumps and diaphragm pumps have been widely used as pumps for pumping paint.Plunger pumps use an air cylinder to reciprocate the plunger, and diaphragm pumps pump air to the back pressure chamber. It is general that the diaphragm is reciprocated by switching the supply to suck and discharge the paint.

[0003]

[Problems to be solved by the device]

 There is a need for an air switching valve, whether it drives the air cylinder of the plunger pump or switches the supply of air to the back pressure chamber of the diaphragm pump. In particular, the valve is prone to early failure due to frequent switching operations, so that the pump has a short operating life to operate correctly.

[0004]

[Means for Solving the Problems]

 The reciprocating pump driving device of the present invention has been devised in view of the above-mentioned points, and the driving device of the reciprocating pump is opposite to each other at symmetrical positions in the radial direction about the output rotating shaft of the motor. Drive magnet plate with magnetic poles connected to it, and at the same position coaxially with the drive magnet plate, a driven magnet plate with opposite magnetic poles provided at symmetrical positions in the radial direction about the same axis. The device is configured so that it cannot rotate around the axis and is free to move in the axial direction along the guide, and its driven magnet plate is connected to the operating rod that is projected from the moving body of the reciprocating pump.

[0005]

[Action]

 When the output rotation shaft of the motor rotates, the drive magnet plate rotates integrally with it, and when each magnetic pole of the drive magnet plate corresponds to each magnetic pole of the driven magnet plate with the same pole, a magnetic repulsive force is generated between both magnet plates and the driven magnet plate is driven. Since the magnet plate is locked, it moves along the guide in the direction away from the drive magnet plate, and then each magnetic pole of the drive magnet plate corresponds to each magnet pole of the driven magnet plate. Then, a magnetic attraction force is generated between the two magnet plates, and the driven magnet plate moves in a direction approaching the driving magnet plate.

This operation is repeated with the rotation of the drive magnet plate, and the moving body of the reciprocating pump is reciprocally driven through the operating rod.

[0007]

[Effect of device]

 That is, in the present invention, the magnetic repulsion force and the magnetic attraction force alternately generated between the drive magnet plate that is rotated by the motor drive and the corresponding driven magnet plate that is axially movable are utilized. By reciprocating the driven magnet plate, the moving body of the reciprocating pump coupled to it is reciprocally driven, and the structure that does not require the air switching valve, which is indispensable in the conventional device, which is prone to failure. The effect is that the pump can be operated accurately for a long time without failure.

[0008]

【Example】

 An embodiment in which the present invention is applied to a plunger pump will be described below with reference to FIG.

In the drawings, reference numeral 1 is a known plunger pump that sucks and discharges paint by reciprocating a plunger (not shown) in a cylinder 2, and is coaxial with the plunger pump 1. A drive motor 3 with a built-in speed reducer is provided.

At the tip of the output rotary shaft 4 of the drive motor 3, the center of a disk-shaped drive magnet plate 5 provided with opposite magnetic poles S and N at symmetrical positions sandwiching the center is fixed.

At the projecting end of the operating rod 7 projecting from the plunger of the plunger pump 1, the center of the driven magnet plate 8 provided with the opposite magnetic poles S and N at symmetrical positions with respect to the center is also the above-mentioned drive magnet. It is fixed so as to correspond to the plate 5.

A notch 9 is formed on the outer periphery of the driven magnet plate 8, and the notch 9 is fitted to a guide bar 10 arranged along the axial direction on the outer side of the driven magnet plate 8. As a result, the driven magnet plate 8 is prevented from rotating, and only the axial movement along the guide bar 10 is allowed.

Next, the operation of this embodiment will be described. When the output rotation shaft 4 of the drive motor 3 rotates, the drive magnet plate 5 fixed to it rotates together. As a result of the rotation, as shown in FIG. 1A, when the magnetic poles S and N of the drive magnet plate 5 correspond to the magnetic poles S and N of the driven magnet plate 8 with the same poles, the two magnetic plates 5 and 8 are Since a magnetic repulsive force is generated between the driven magnet plate 8 and the driven magnet plate 8 which is prevented from rotating, the driven magnet plate 8 moves along the guide bar 10 in a direction away from the drive magnet plate 5. Next, as shown in FIG. 7B, when the magnetic poles S and N of the drive magnet plate 5 correspond to the magnetic poles S and N of the driven magnet plate 8 with the opposite poles, respectively, A magnetic attraction force is generated between them, and the driven magnet plate 8 moves in a direction approaching the driving magnet plate 5.

This operation is repeated with the rotation of the drive magnet plate 5, and the plunger of the plunger pump 1 is reciprocally driven via the operating rod 7 fixed to the driven magnet plate 8.

As described above, according to the present embodiment, the linear motion of the operating rod 7 is achieved by utilizing the magnetic repulsive force and the magnetic attractive force that alternately generate the rotational movement of the drive motor 3 between the magnet plates 5 and 8. Since the plunger is reciprocally driven instead of the reciprocating motion, and the structure which does not require the air switching valve which is likely to cause a failure is adopted, the accurate operation of the plunger pump 1 for a long time is secured.

The present invention can be widely applied as a drive device for general forward and backward pumps including a diaphragm pump as well as a plunger pump.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the structure and operation of an embodiment of the present invention.

[Explanation of symbols]

1: Plunger pump 2: Cylinder 3: Drive motor 4: Output rotary shaft 5: Drive magnet plate 7: Actuating rod 8:
Driven magnet plate 9: Notch 10: Guide bar S, N: Magnetic pole

Claims (1)

[Scope of utility model registration request] 1. A drive device of a reciprocating pump that reciprocates a moving body such as a plunger or a diaphragm in a cylinder to suck and discharge a fluid, wherein an output rotary shaft of a motor is provided with the output rotary shaft. A drive magnet plate provided with magnetic poles opposite to each other is coupled to a radial symmetric position around the center, and at a position corresponding to the drive magnet plate coaxially therewith, also at a radial symmetric position around the axis. An operation in which a driven magnet plate provided with magnetic poles opposite to each other is provided so as not to be rotatable about an axis and free to move in an axial direction along a guide, and the driven magnet plate is projectingly provided on the moving body of the reciprocating pump. A reciprocating pump driving device characterized by being connected to a rod.