JPH01257775A - Device for driving plunger of plunger pump - Google Patents

Abstract

PURPOSE:To improve productivity and durability by specifying the facing distance in a plunger sliding direction of the peripheral face configuration of a rotation/slide converting space and the length in the direction perpendicularly intersecting to the plunger sliding direction thereof. CONSTITUTION:A disk like rotary member 25 is eccentrically fixed to a rotation driving shaft 19. Then, this rotary member 25 is housed in the rotation/slide converting space 22 of a sliding member 21 which is slidably supported by a pump casing 3. The facing distance on the peripheral-face configuration of the rotation/slide converting space 22 is nearly equal to the diameter of the rotary member 25 in the sliding direction of plungers 15, while forming the length in the direction perpendicularly intersecting thereto to be on the outside of the maximum rotation locus of the rotary member 25. Thereby, the sliding member 21 can reciprocate along the peripheral face of the rotary member 25, in between the maximum rotation locus A and the minimum rotation locus B thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a driving device for a plunger that slides back and forth within a cylinder.

<Prior art> This type of plunger drive device is constructed by rotatably supporting a crankshaft on a pump casing, and connecting the crankshaft and plunger with a connecting rod. The rod converts it into reciprocating sliding motion and transmits it to the plant.

<Problems to be Solved by the Invention> - In the single-runcier drive device with the conventional structure, the crankshaft is formed by forging, and it takes time and effort to carve each journal part, and it also takes time to carve each journal part. Since the connecting structure is divided into two and there are many parts, there is a problem of low productivity and high cost.

In addition, side pressure is always applied to the plunger that is slid back and forth by the crank motion, and the plunger and cylinder in that area wear out quickly, which poses a problem in the durability of the pump.

The present invention has been proposed in view of such problems, and one object thereof is to provide a plunger drive device with high productivity and excellent durability.

In order to achieve the above object, a plunger drive device for a plunger pump according to the present invention includes a cylinder in which a plunger is slidably reciprocated, and a pump casing in which the cylinder is fixed. , a drive device that reciprocates the plunger, and the drive device includes a rotary drive shaft driven by the drive means, a disc-shaped rotating member eccentrically fixed to the rotary drive shaft, The rotary member is housed in a rotation-sliding conversion space and a sliding member is slidably supported by the pump casing, and the circumferential shape of the rotation-sliding conversion space is set so that the facing distance is equal to the sliding distance of the plunger. In the direction of movement, the length is the same as the diameter of the rotatable member, and the length in the direction perpendicular to the sliding direction of the plunger is formed to be located outward from the maximum rotation locus of the rotatable member. This is a characteristic feature.

Function> First, a disc-shaped rotating part is fixed to the rotational drive shaft in an eccentric manner.

Next, this rotary member is housed in the co-rotating and sliding conversion space of the sliding portion, which is slidably supported by the pump casing, and a plunger drive device is constructed.

In the plunger drive device configured as shown in Fig. 1-7, when the rotating part 10 is driven together with the rotating drive shaft by the lower rotating drive stage, the sliding member slidably supported by the pump casing moves into the rotating member. It takes turns to slide back and forth between its maximum rotation locus and minimum rotation locus along the circumferential surface of the rotor.

Here, since the sliding part is slidable on the pump casing, a large amount of reciprocating driving force acts on the plunger.

<Example> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view schematically showing a horizontally opposed six cylinder type plunger bomb, and FIG. 2 is a partially cutaway front view thereof.

In the figure, numeral 1 indicates the plunger pump as a whole;
This plunger pump 1 is constructed by fixing a pump portion 4 and a pump head 5 to both left and right ends of a pump casing 3 housing a drive device 2 therein.

] - The bomb head 5 has a discharge hole 6 opened on the upper end surface 1.
A suction hole 7 is opened on the lower end surface, and a discharge hole 6 is opened on the lower end surface.
and the suction hole 7 are communicated with each other through a passage 8, and a ball valve body 10 is connected to a portion of the passage 8 near the discharge hole 6 with a closing spring 9.
A discharge valve 11 is provided in which a ball valve body 13 is biased to close by a closing spring 12, and a suction valve 14 is provided in a portion of the passage 8 near the suction hole 7, in which a ball valve body 13 is biased to close by a closing spring 12. It is being

The pump section 4 branches out a partition wall forming space 17 from the passage 8 between the suction valve 11 and the discharge valve 14, which communicates with a cylinder 16 in which a plunger 15 is movably slidable in a reciprocating manner. A bellows-shaped partition wall 18 is provided in the storage space 17 to partition the cylinder side and the passage side.

-1- The drive device 2 installed inside the pump gauging 3 is rotated in a circle with its center 02 eccentric from its axis 01 on a rotary drive shaft 19 rotatably supported on the front and rear side walls of the pump casing 3. A rotating member 25 is formed by fixing a plate-shaped rotating plate 20 and fitting a ring 23 to the ball around its outer periphery. It is configured to be housed in a rotation-sliding conversion space 22.

As shown in FIG. 3, the circumferential shape of the rotation-sliding conversion space 22 is determined by determining the distance between the opposing circumferential surfaces and the diameter of the rotating member 25 in the sliding direction of the plunger 15. The length of the plunger 15 in the direction orthogonal to the sliding direction is set to be located outward from the maximum rotation locus of the rotating member 25.

The operation of the plunger drive device 2 of the plunger pump configured as described above will now be described.

First, place the center o2 of the rotating part +J'25 on the part of the rotational drive shaft 19 facing the cylinder 16, and place the center o2 of the rotational drive shaft 19 on the axis 0 of the rotational drive shaft.
Fix it in an eccentric state from 1.

Next, the rotation-sliding conversion space 22 of the sliding member 21, which is slidably supported by the pump casing 3, rotates the rotating member 25.
When the plunger drive device 2 is housed in the plunger drive device 2, the plunger drive device 2 is constructed.

In the plunger drive device 2 thus configured, when the rotational member 25 is rotationally driven together with the rotational drive shaft 19 by the rotational drive means, the circumferential shape of the rotation-sliding conversion space 22 changes to the opposing circumferential surface. The sliding member 21 pushes the plunger 15 as the rotating member 25 changes from the minimum rotation trajectory B to the minimum rotation trajectory 8. Advance in the direction of pushing out.

As a result, the plunger 15 is slid back and forth with the distance S between the maximum rotation trajectory A and the minimum rotation trajectory B of the rotating member 25 being one stroke and one loaf.

Here, the sliding member 21 slides on the pump casing 3.
Since the plunger 15 is supported by the cylinder 15, only a reciprocating driving force acts on the plunger 15.

Further, as illustrated in the above embodiment, if the plungers 15 are provided at both left and right ends of the sliding member 21, the left and right plungers 15 can be provided concentrically in a plan view, and the plunger pump 1 can be Although it has the advantage of being able to reduce the width, it goes without saying that the present invention is not limited to horizontally opposing type cylinder pumps, but can also be applied to single cylinder plunger pumps. .

<Effects of the Invention> As explained above, according to the plunger drive device of the plunger pump of the present invention, the plunger drive device fixes the disc-shaped rotating member eccentrically to the rotational drive shaft, and The structure is simple enough to be housed in the rotation-sliding conversion space of the moving member, the number of parts is extremely small, productivity can be increased, and manufacturing costs can be reduced.

Moreover, the sliding member that reciprocates the plunger is slidably supported by the pump casing, and when the sliding member is reciprocated by the rotation of the rotating member, only the reciprocating sliding component is applied to the plunger. Since no lateral pressure is applied, uneven wear of the plunger and cylinder due to lateral pressure is prevented, and the durability of the pump can be greatly improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic perspective view of a horizontally opposed multi-cylinder plunger pump, Fig. 2 is a partially cutaway front view thereof, and Fig. 3 is a schematic perspective view of a horizontally opposed multi-cylinder plunger pump. is an explanatory diagram of the operation of main parts. 1... Plunger pump, 2... Drive device, 3...
・Pump casing, 15...Plunger, 16...
- Cylinder, 19...Rotation drive shaft, 21...Sliding member, 22...Rotation-sliding conversion space, 25...Rotation member, A.1 maximum rotation locus.

Claims (1)

[Claims] (1) Consisting of a cylinder in which a plunger is slidably reciprocated, a pump casing to which the cylinder is fixed, and a drive device that drives the plunger back and forth, the drive device has a rotary drive shaft driven by a drive means. a disc-shaped rotating member eccentrically fixed to the rotational drive shaft; and a sliding member that accommodates the rotating member in a rotation-sliding conversion space and is slidably supported by the pump casing. The circumferential shape of the rotation-sliding conversion space is approximately the same length as the diameter of the rotatable member in the sliding direction of the plunger, and 1. A plunger drive device for a plunger pump, characterized in that the length of the plunger drive device is formed to be located outward from the maximum rotation locus of a rotatable member.