JPH0512669U - Stroke adjustment mechanism of reciprocating pump - Google Patents

Abstract

(57) [Summary] [Purpose] The object is to enable adjustment of the discharge amount over a wide range without affecting the pump operation. A crank is provided so that the amount of eccentricity with respect to the rotating body 13 can be adjusted, and a connecting position between the crank and the connecting rod 22 is adjusted in accordance with the adjustment of the amount of eccentricity so as to maintain a constant bottom dead center of the piston or the plunger 7. Is characterized in that it can be changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stroke adjusting mechanism for a reciprocating pump, and more particularly, to a stroke adjusting mechanism for a reciprocating pump that reciprocates a piston or a plunger via a link mechanism to a rotating body that is rotationally driven to perform pump operation.

[0002]

[Prior Art]

 Conventionally, as means for adjusting the discharge amount of this type of reciprocating pump, there has been, for example, a means for increasing / decreasing the number of revolutions of a motor serving as a drive source or changing a gear ratio by replacing a reduction gear of the motor. .

[0003]

[Problems to be solved by the device]

 However, the means for increasing / decreasing the number of rotations of the motor has a disadvantage that the adjustment range is extremely narrow because the increase / decrease width has a certain limit.

In the means for replacing the reducer of the motor, for example, if the gear ratio is increased and the number of strokes is decreased, the intermittent operation of the discharge operation is promoted, so that the concentration of the circulating fluid changes. However, if the gear ratio is reduced and the number of strokes is increased, the permissible torque will decrease, which may cause a torque shortage.

That is, all of the above-mentioned conventional means are not optimal as means for controlling the discharge amount because they adversely affect the pump operation.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and it is possible to adjust the discharge amount over a wide range without affecting the pump operation. It is an issue.

[0007]

[Means for Solving the Problems]

 That is, in order to solve the above problem, the present invention provides a crank rotatably provided at an eccentric position of a rotary body 13 which is driven to rotate, and a connecting rod 22 rotatably connected to the other end of the crank. A stroke adjusting mechanism of a reciprocating pump configured such that the piston or the plunger 7 reciprocates. The crank is provided to adjust the eccentric amount with respect to the rotating body 13, and A stroke adjusting mechanism for a reciprocating pump having a configuration in which a connecting position between a crank and the connecting rod 22 can be changed in accordance with adjustment of the eccentric amount so as to maintain a constant dead point.

[0008]

[Action]

 Therefore, in the stroke adjusting mechanism having the above-described structure, the rotating rotor 13 causes the plunger 7 and the like to reciprocate through the crank and the connecting rod 22 to perform pump operation. By increasing or decreasing the eccentricity of the crank with respect to 13, the stroke length of the plunger 7 or the like can be adjusted.

If the connecting position of the connecting rod 22 with the crank is appropriately changed by the amount corresponding to the increase or decrease of the eccentricity, the plunger 7 and the like can reach the bottom dead center of the reciprocating stroke. All the fluid that has flowed into the pump chamber can be discharged to the outside.

Therefore, even if gas such as bubbles is contained in the fluid, the gas is discharged together with the fluid and does not remain in the pump chamber, so that a fixed amount of fluid is discharged without affecting the pump operation. It will be possible.

[0011]

【Example】

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

In FIG. 1, reference numeral 1 denotes a reciprocating pump including a pump unit 2, a driving unit 3, and a drive transmitting unit 4, and the pump unit 2 reciprocates in a pump chamber 6 in a pump head 5. The fluid is sucked from the inflow hole 8 communicating with the pump chamber 6 by the nozzle 7 and can be discharged to the outside from the outflow hole 9.

Reference numeral 10 denotes a motor that constitutes the drive unit 3, and is fixed to the upper surface of the flange 12 by the frame 11. Reference numeral 13 is a substantially disk-shaped rotating body fixed to the rotating shaft 14 of the motor 10. As shown in FIG. 2, two through holes 15a and 15b are bored along the radial direction at the eccentric position on the side surface thereof. Become. Reference numeral 16 denotes an el ball having a pin 17 that can be inserted into the through hole 15a or 15b of the rotating body 13, and a pair of sides facing an arm 18 that is rotatably projected on the peripheral surface of the el ball 16. A joint 20 having pieces 19 and 19 is connected to each other, and a pair of through holes 21a and 21b are arranged in the longitudinal direction of the side pieces 19 and 19 so as to face each other.

Reference numeral 22 denotes a connecting rod rotatably connected to the joint 20 via a pin 23 inserted into the through hole 21a or 21b of the side piece 19, 19, and the plunger 7 is attached to the tip thereof. The pin 17 of the elbow 16 is inserted into the through hole 15a of the rotary body 13, and the pin 23 of the joint 20 side is inserted into the through holes 21a and 21a of the side pieces 19 and 19, respectively. The plunger 7 is set so as to reach the bottom dead center A in the pump chamber 6 at the time of the maximum forward movement. The distance L between the through holes 15a and 15b of the rotating body 13 is set to be the same as the distance L'between the through holes 21a and 21b of the joint 20. Reference numeral 24 is a drive unit cover attached to protect the drive transmission unit 4.

The present embodiment is configured as described above, and the case of using this will be described next.

First, when the pump unit 2 is caused to perform a pumping operation, the motor 10 is driven to rotate the rotating body 13, and then the elbow 16, the joint 20, the connecting rod 22 and the like are used to drive the motor shown in FIG. ) To (C), the plunger 7 reciprocates in the pump chamber 6 and the fluid sucked into the pump chamber 6 from the suction hole 8 is discharged from the outflow hole 9.

Then, when the stroke length of the plunger 7 is adjusted to change the discharge amount, the pin 17 of the elbow 16 is inserted into the other through hole 15b as shown in FIG. 23 may be inserted in the other through hole 21a of the side pieces 19, 19.

That is, the distance L between the through holes 15a and 15b of the rotating body 13 is set to the same dimension as the distance L ′ between the through holes 21a and 21b of the joint 20, and therefore, FIG. As shown in (f), the plunger 7 reaches the bottom dead center A in the pump chamber 6, and the stroke of the plunger 7 can be reduced by the amount of increase in the eccentric amount L of the pin 17 of the elbow 16. As a result, the discharge amount of fluid can be reduced.

With such an extremely simple operation, the stroke length of the plunger 7 can be adjusted to easily change the discharge amount of the fluid.

Further, since the plunger 7 can reach the bottom dead center A in the pump chamber 6 as described above, all the fluid sucked into the pump chamber 6 can be discharged, so that even bubbles or the like in the fluid can be discharged. Even if the gas is included, the gas is discharged together with the fluid and does not remain in the pump chamber 6, so that a certain amount of the fluid can be discharged without affecting the pump operation.

Further, if the distance L between the rotating body 13 and the through holes 15a and 15b is increased, there is an advantage that the stroke adjustment range of the plunger 7 can be easily widened.

In the above embodiment, the stroke of the plunger 7 can be adjusted in two steps. However, the through holes 15a and 15b and the through holes 21a and 21b are changed to long holes and each pin is changed. By configuring 17 and 23 so that they can be fixed to the predetermined positions of the elongated holes, it is possible to adjust the stroke infinitely.

There is no particular limitation on the specific connecting means and means for adjusting the connecting position of the rotating body 13, the elbow 16, the joint 20, and the connecting rod 22.

Furthermore, it goes without saying that the pump unit 2 is not limited to the specific embodiment in the specific configuration, and can be widely applied to this type of reciprocating pump.

[0025]

[Effect of the device]

 As described above, according to the present invention, the eccentric amount of the crank with respect to the rotating body can be adjusted, and the connecting position of the crank and the connecting rod can be adjusted according to the adjustment of the eccentric amount. , The number of strokes is adjusted by changing the number of revolutions of the motor that drives the pump, etc. There is no adverse effect on the pump operation as in the past and there is no inconvenience that the adjustment range is limited, and the desired discharge amount It has come to obtain a special effect of being able to discharge.

Further, since the connecting position of the crank and the connecting rod can be changed according to the adjustment of the eccentricity between the rotating body and the crank as described above, the bottom dead center of the plunger or the like can be fixed without changing. As a result, all of the fluid that has flowed into the pump can be discharged to the outside in the discharge stroke, so even if the fluid contains gas such as bubbles, the gas is discharged together with the fluid and is discharged inside the pump chamber. Since it does not remain in the pump, it has the unique effect of being able to discharge a certain amount of fluid without affecting the pump operation.

[Brief description of drawings]

FIG. 1 is a sectional view of a reciprocating pump having a stroke adjusting mechanism for the reciprocating pump according to the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a stroke adjusting mechanism of a reciprocating pump.

FIG. 3 is an enlarged sectional view of an essential part showing a stroke adjusting mechanism of a reciprocating pump.

4 (a) to (c) are explanatory diagrams showing a series of pump operations of the reciprocating pump, and (d) to (f) showing a series of pump operations of the reciprocating pump when stroke adjustment is performed. FIG.

[Explanation of symbols]

 7 ... Plunger 13 ... Rotating body 15 ... Through hole 21 ... Through hole 22 ... Continuous rod

Claims (2)

[Scope of utility model registration request] 1. A crank is rotatably provided at an eccentric position of a rotationally driven rotating body, and a piston or a plunger 7 reciprocates through a connecting rod 22 rotatably connected to the other end of the crank. Is a stroke adjusting mechanism of a reciprocating pump, wherein the crank is provided so as to adjust the amount of eccentricity with respect to the rotating body 13, and the eccentricity is maintained in order to maintain a constant bottom dead center of the piston or the plunger 7. A stroke adjusting mechanism for a reciprocating pump, characterized in that the connecting position of the crank and the connecting rod 22 can be changed according to the adjustment of the amount. 2. A plurality of through holes 15 ... Is provided in the radial direction of the rotating body 13, one end of the crank is pin-connectable to any of the through holes 15 ,. The stroke adjusting mechanism for a reciprocating pump according to claim 1, wherein a plurality of through holes (21) are provided at the other end, and one end of the connecting rod (22) can be pin-connected to any of the through holes (21). .