JPS5840666B2 - Reciprocating pump drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the discharge volume per unit stroke is variable, and the position of the top dead center in the pump chamber of the tip of the plunger changes as the discharge volume per unit stroke changes. This invention relates to a drive device for a reciprocating pump that is always kept in a constant position.

Changing the discharge capacity per unit stroke of a plunger-type reciprocating pump is usually done by changing the stroke length of the plunger. When the position of the top dead center in moves, the minimum gap between the tip surface of the plunger and the head wall surface of the pump chamber changes accordingly.

In general, if the minimum gap between the tip of the plunger and the head wall of the pump chamber is large, there will be a large amount of fluid remaining in the pump chamber at the end of the discharge stroke, and the plunger will need to be Even if the remaining fluid is a liquid, unnecessary effects such as expansion and compression on air and other gaseous components mixed in the liquid occur, resulting in a decrease in fluid discharge accuracy and a decrease in pump efficiency. decreases.

In order to eliminate this inconvenience, the top dead center of the plunger tip in the pump chamber at the maximum stroke is adjusted so that the minimum gap between the plunger tip surface and the head wall surface of the pump chamber is as small as possible. However, as long as the position of the top dead center of the tip of the plunger in the pump chamber changes as the stroke length of the plunger changes, the stroke length of the plunger can be shortened to increase the per unit stroke. If an attempt is made to reduce the discharge capacity of the pump, the minimum gap between the tip of the plunger and the head wall of the pump chamber increases, resulting in a decrease in fluid discharge accuracy and pump efficiency.

Therefore, as an effective way to obtain a reciprocating pump that can always maintain the highest fluid discharge accuracy and pump efficiency even if the stroke length of the plunger is changed, when changing the discharge volume per unit stroke, It is conceivable to configure a reciprocating pump so that the position of the top dead center of the plunger tip in the pump chamber is always maintained at a constant position as the stroke length of the plunger changes, but in the past, There is no single drive device for a reciprocating pump that is simple in construction and can effectively perform such a function.]
Ta.

In view of the above circumstances, the present invention has a simple configuration, and is capable of keeping the top dead center of the plunger tip at a constant position in the pump chamber as the discharge volume per unit stroke changes. The main object of the present invention is to provide a reciprocating pump drive device that can extremely easily change the discharge volume per unit stroke.

Hereinafter, one embodiment of the present invention will be described according to the drawings. First, in FIGS. 1 and 2, an input shaft 2 rotatably driven by a prime mover M is attached to a casing 1 and rotates via a pair of bearings 3 and 3'. The input shaft 2 is rotatably supported, and a square shaft portion 5 having a quadrilateral shape in the transverse direction is formed between a pair of bearing holding flanges 4 and 4' on the input shaft 2.

Each side surface of the square shaft portion 5 forms a plane parallel to the center line of the input shaft 2, and at least one pair of these side surfaces are parallel to each other, and one of the side surfaces has a plane parallel to the center line of the input shaft 2. Guide key 6 in a direction inclined to the center line of 2.
is installed.

An eccentric wheel 7 having a synovial fluid groove 8 opened in the radial direction is provided on the square shaft portion 5, and the synovial fluid groove 8 is formed by engaging with the guide key 6.
The connecting rod 10 is guided by the guide key 6 in the direction of the eccentric ring 1 and is fitted in a tight manner so as to be able to synchronize, and the proximal end side of the connecting rod 10 is further fitted onto the outer circumferential surface of the eccentric ring 1 via a bearing 9. ing.

A synovial hole 12 is formed in the distal end 11 of the connecting rod 10, and a bearing 13 having an inner circumferential surface inclined in the axial direction is provided in the synovial hole 12. This bearing 13 is sealed by the casing 1. A constant inclination angle with respect to the centerline of the plunger support 15 is formed between a pair of legs 17 and 17' that protrude toward the proximal end of the plunger support 15 that is synovably supported in the axial direction via the member 16. Tilt axis 1 supported at θ
8 is freely penetrated by synovial fluid.

The pair of legs 17 and 17' slide along shoulders 19 and 19' formed in the casing 1, so that the tilt axis 18 is always kept in the same plane as the center line of the input shaft 2. It is configured as follows.

The plunger 14 supported by the plunger support 15 on the center line of the plunger support 15 is connected to the seal member 20.
extends into the pump chamber 21, and extends into the pump chamber 21.
By reciprocating in the axial direction within 1, the fluid sucked from the suction pipe 22 side through the check valves 23 and 24 is transferred to the check valve 2.
5.26 to the discharge pipe 27 side.

A pair of arms 29, 29' are provided on both side surfaces of the eccentric ring 1 and the connecting rod 10, and protrude from the distal end side of the shifter 28, which is screwed onto an adjustment screw 30 parallel to the input shaft 2 at the proximal end side. extends in an arc concentrically with the input shaft 2, and a synovial fluid groove 3 formed at the proximal end of the chic 28
1 is fitted into a guide member 32 protruding from the inner surface of the casing 1 in parallel with the input shaft 2 in a synovial manner.

As shown in FIG. 3, the adjusting screw 30 is supported by the casing 1 via a pair of bearings 33 and 33', and is rotated from the outside of the casing 1 using a handle 34 attached to one end of the adjusting screw 30. It can be rotated from

The eccentric wheel 1 is guided between a first position closest to the bearing 3' as shown in FIG. 1 and a second position closest to the bearing 3 as shown in FIG. 6, and when it is in the first position as shown in FIG. 1, the center of the eccentric wheel 7 is on the center line of the input shaft 2 as shown in FIG. is not eccentric at all, but the third
When the eccentric wheel 1 is in the second position as shown in the figure, the center of the eccentric wheel 1 is farthest from the center line of the input @2 as shown in FIG. 4, and the eccentricity E of the eccentric wheel T at this time is the maximum. It is set as follows.

When the eccentric wheel 1 is eccentric from the center line of the input shaft 2, the eccentric wheel 7 rotates integrally with the input shaft 2 as the input shaft 2 rotates, causing a cranking motion in the connecting rod 10.

The crank motion of the connecting rod 10 is transmitted to the plunger support 15 and the plunger 14 via the inclined shaft 18 as a linear reciprocating motion.

The inclination angle θ of the inclination shaft 18 with respect to the plunger 14 is such that when the eccentric wheel 1 is at any position between the first position and the second position on the input shaft 2, the pump chamber at the tip of the plunger 14 The position of the top dead center within 21 is set to always be a constant position.

That is, when the side surface of the square shaft portion 5 provided with the guide key 6 faces toward the chic 28 and is parallel to the center line of the plunger 14 as shown in FIGS. 1 to 4, the connecting rod 10 is at its maximum eccentricity toward the plunger 14. Therefore, if the tilt angle θ of the tilt shaft 18 is set in advance so that the tilt shaft 18 and the guide key 6 are parallel to each other in such a state, When the eccentric ring 7 is at any position on the guide key 6, the top dead center position of the tip of the plunger 14 within the pump chamber 21 is always maintained at a constant position.

With the above structure, when the adjustment screw 30 is rotated using the handle 34, the shifter 28 is guided by the guide member 32 and moves in the axial direction of the input shaft 2, and the connecting rod 10 and The eccentric ring 7 is pressed in the axial direction of the input shaft 2.

At this time, the eccentric wheel 7 moves along the guide key 6 in FIGS.
Between the first position, which is not offset from the center line of the input shaft 2 at all as shown in the figure, and the second position, which is the most eccentric from the center line of the input shaft 2, as shown in FIGS. 3 and 4. Moving.

During this time, the position of the top dead center of the tip of the plunger 14 within the pump chamber 21 is always maintained at a constant position.

When the eccentricity of the eccentric wheel 7 is set to an appropriate value, when the input shaft 2 is rotated by the prime mover M, the rotation is transmitted to the connecting rod 10 via the eccentric wheel 7, and the connecting rod 10 responds to the eccentric rotation of the eccentric wheel 1. is converted into a reciprocating linear motion, and the motion is transmitted to the plunger 14 via the tilting shaft 18 and the plunger support 15.

During operation, the Schick 2B has an eccentric wheel T and a hun rod 10.
The displacement of the input shaft 2 in the axial direction is restricted, and even during operation, by operating the handle 34, the eccentricity of the eccentric wheel 1 can be changed at any time to adjust the discharge amount per unit stroke. can be adjusted freely.

As described above, the present invention includes an eccentric wheel whose eccentricity from the center line of the input shaft gradually changes as the input shaft is moved from the first position to the second position when viewed in the axial direction. Therefore, the amount of eccentricity of the eccentric wheel can be controlled extremely easily.
Therefore, it is easier to adjust the stroke length of the plunger, and since Schick is used to adjust the eccentricity of the eccentric wheel, it is possible to remotely control the eccentricity of the eccentric wheel, and the eccentricity of the eccentric wheel can be controlled remotely. The shifter restricts the movement of the eccentric wheel in the axial direction, allowing it to operate stably, and the eccentric rotation of the eccentric wheel is converted into reciprocating linear motion by the connecting rod, which is transmitted through the plunger. The mechanism of the motion converter is extremely simple and can operate stably, and the tip of the connecting rod is pivoted on an inclined shaft supported at a constant angle of inclination with respect to the plunger at the base end of the plunger support. Therefore, the inclination angle of this inclination shaft with respect to the plunger must be set so that the position of the top dead center of the tip of the plunger in the pump chamber is always a constant position, regardless of the amount of eccentricity of the eccentric wheel. By setting the inclination angle of the inclination axis in this way, the position of the top dead center of the tip of the plunger in the pump chamber is always at a constant position, regardless of the amount of eccentricity of the eccentric wheel and therefore the stroke length of the plunger. Because it is configured so that As a result, a drive device for a variable displacement reciprocating pump with extremely high fluid discharge accuracy and pump efficiency can be obtained.

Further, according to the present invention, a plurality of drive devices having the configuration of the present invention are connected in the direction of the input shaft, and a plurality of reciprocating pumps arranged in parallel can be simultaneously driven by a common input shaft. is possible.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional plan view taken along line II in FIG. 2 of a reciprocating pump drive device based on an embodiment of the present invention, and FIG. 2 is a cross-sectional side view taken along line ■-■ in FIG. 1. , FIG. 3 is a vertical cross-sectional plan view taken along line 1-I [1] of FIG. 4 in a state different from that of FIG. 1, and FIG. 4 is a cross-sectional side view taken along line ■■ of FIG. 2... Input shaft, 6... Guide key 7.
... Eccentric wheel, 10 ... Conrod, 11
...Tip of connecting rod 10, 12...
・Synovial fluid drop, 13... Bush, relative torsion force absorbing member, 14... Plunger, 15...
・Plunger support body, 18... Inclined shaft, 21.
...Pump room, 28...Sick, θ...
...Inclination angle.

Claims (1)

[Scope of Claims] 1 The input shaft 2 is fitted onto the input shaft 2 so as to move synovial fluid in the radial and axial directions with respect to the human power shaft 2 and hang.
an eccentric ring 7 that is guided and circuits together with the input shaft 2 so that the amount of eccentricity from the center line of the input shaft 2 gradually changes as the input shaft 2 is moved from a first position to a second position as viewed in the axial direction; The eccentric wheel 7 can be moved in the axial direction of the input shaft 2 between the first position and the second position, and the eccentric ring 7 can be moved between the first position and the second position. A shifter 28 that can restrict the axial movement of the eccentric wheel 7 with respect to the input shaft 2 at any position; A connecting rod 10 is connected to a plunger support 15 which is integrally reciprocated with the plunger 14 on the part 11 side, and the plunger 14 is connected to the plunger support 15 on the base end side of the plunger support 15.
The inclined shaft 18 is supported at a constant angle of inclination θ with respect to the connecting rod 10 and freely passes through the synovial fluid hole 12 formed in the distal end portion 11 of the connecting rod 10.
8 with respect to the plunger 14 is the inclination angle θ of the tip of the plunger 14 when the eccentric ring 7 is at any position between the first position and the second position on the input shaft 2. A reciprocating pump drive device that is set so that the top dead center position in the pump chamber 21 is always at a constant position. 2. In the reciprocating pump drive device according to claim 1, the outer peripheral surface of the input shaft 2 at least between the first position and the second position is aligned with the center line of the input shaft 2. It has a parallel plane part, and a guide key 6 is disposed on this plane part in a direction inclined with respect to the center line of the input shaft 2,
The eccentric wheel 1 is fitted onto the input shaft 2 so as to slide along the guide key 6. This is a reciprocating pump drive device.