CN204200502U - A kind of plunger pump - Google Patents

Abstract

A plunger pump includes a pump casing, a crankshaft installed in the pump casing, and a direct drive motor. At least one end of the crankshaft extends out of the pump casing, and the end of the crankshaft extending out of the pump casing is connected with a direct drive motor. The plunger pump has simple structure and good connection reliability, and is suitable for pumping mud, acid liquid, drilling fluid, sulfur-containing crude oil and other oil well operating fluids.

Description

a plunger pump

technical field

The utility model relates to the technical field of plunger pumps, in particular to a plunger pump driven by a direct drive motor and used for pumping liquids such as mud and sulfur-containing crude oil.

Background technique

The plunger pump makes the fluid medium work through the pressure difference caused by the pressure difference caused by the change of the sealing volume in the plunger cylinder of the plunger cylinder when the plunger performs reciprocating motion in the plunger cylinder. The traditional plunger pump needs to be connected with an independent electric motor or internal combustion engine through an outstretched pump shaft to form a motor-hydraulic pump unit to work, and the coupling, pump frame and other components are essential for connection. The connection and installation in the above manner makes the whole motor-hydraulic power unit bulky, heavy, costly and noisy.

The utility model patent with the application number of 2006220079625.2 discloses a hydraulic motor axial piston pump. An electronic stator is installed in the pump casing, and a motor winding is installed in the motor stator. There is a motor rotor inside the motor stator, and the rotor guide bars are evenly distributed in the motor rotor. , there is an end ring on both sides of the end face, the cylinder block is installed in the inner hole of the motor rotor, a number of axial grooves are uniformly distributed on the inner surface of the right pump cover, and there is a flow plate between the end faces of the left pump cover and the cylinder block , a plurality of plungers are evenly distributed in the cylinder body, and the plungers are closely attached to the slope on the right pump cover through the sliding shoe, the return plate, the ball joint, and the return spring. The plunger pump simplifies the power transmission chain, the hydraulic motor plunger pump does not need to extend the shaft, the seal is reliable, and there is no external leakage; the use of the oil cooling method eliminates the fan in the motor, which reduces the wind noise to a limited extent. However, the structure of the plunger pump is relatively complex, and it cannot bear the heavy load tasks of pumping mud, acid liquid, drilling fluid, sulfur-containing crude oil and other oil well operating fluids.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings in the prior art and provide a plunger pump directly driven by a direct drive motor. The technical solution adopted is: a plunger pump, including a pump casing and a The crankshaft inside the casing is characterized in that at least one end of the crankshaft protrudes outside the pump casing, and a direct drive motor is connected to the end of the crankshaft protruding outside the pump casing.

The technical feature of the utility model is that the crankshaft is inserted into the rotor of the direct drive motor, and the crankshaft and the rotor are connected by expansion sleeves.

The technical feature of the utility model is that there is a flange connection plate between the casing of the direct drive motor and the pump casing.

The technical feature of the utility model is that the plunger pump also includes a plunger and a slider crank mechanism, and the direct drive motor drives the plunger through the slider crank mechanism to realize the reciprocating motion of the plunger.

In order to increase the driving power required by the pump, the utility model sets both ends of the crankshaft as driving ends, and direct-drive motors are arranged at both driving ends. Correspondingly, both ends of the crankshaft extend out of the pump casing.

The beneficial effect of the utility model is that: the improvement point of the utility model lies in further simplifying the structure of the large-scale plunger pump, eliminating the coupling and the mechanical transmission mechanism between the motor and the motion execution part in the traditional plunger pump, Therefore, the investment and maintenance cost of the plunger pump are effectively saved, and the transmission energy loss is reduced; the plunger pump has a compact shape and requires a small installation space; the expansion sleeve connection between the direct drive motor and the crankshaft is applied between the rotor and the crankshaft The large positive pressure ensures the transmission of large loads; the plunger pump has a simple structure and good connection reliability, and is suitable for pumping mud, acid liquid, drilling fluid, sulfur-containing crude oil and other oil well operating fluids.

Description of drawings

Accompanying drawing 1 is a schematic structural diagram of the utility model, and accompanying drawing 2 is a three-dimensional schematic diagram of the utility model, wherein, 1 is a pump casing, 2 is a rotor, 3 is an expansion sleeve, 4 is a flange connection plate, 5 is a slider, 6 It is connecting rod, and 7 is the casing of direct drive motor, and 8 is a direct drive motor, and 9 is a crankshaft.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the utility model is described. The utility model discloses a plunger pump, which comprises a pump casing 1 and a crankshaft 9 installed in the pump casing 1. At least one end of the crankshaft 9 protrudes outside the pump casing 1, and the end of the crankshaft extending outside the pump casing 1 is connected directly Drive motor 8. A flange connection plate 4 is provided between the casing 7 of the direct drive motor 8 and the pump casing 1 . The direct drive motor 8 drives the plunger through the slider crank mechanism to realize the reciprocating motion of the plunger.

In this embodiment, the crankshaft 9 is inserted into the rotor 2 of the direct drive motor 8 , and the expansion sleeve 3 for connection is between the crankshaft 9 and the rotor 2 . The crankshaft 9 and the rotor 2 jointly constitute the driving part of the direct drive motor 8 .

In order to achieve the purpose of high-power pumping, both ends of the crankshaft 9 protrude out of the pump housing 1 in this embodiment.

The crankshaft end of the plunger pump closely cooperates with the rotor 2 of the direct drive motor 8 through the expansion sleeve 3, and together constitute the driving part of the direct drive motor 8. When the direct drive motor 8 is powered on, the rotor rotates and transmits power to the crankshaft 9, thereby completely It changes the complex drive form in which the motor power is transmitted to the crankshaft through the mechanical transmission parts in the traditional plunger pump, simplifies the power transmission mechanism, and improves the controllability of the plunger pump.

Of course, the above descriptions are not limitations of the present utility model, and the present utility model is not limited to the above-mentioned examples. Changes, modifications, additions or replacements made by those of ordinary skill in the art within the essential scope of the present utility model also belong to Protection scope of the present utility model.

Claims (5)

1. A plunger pump, comprising a pump casing, a crankshaft installed in the pump casing, and a direct-drive motor; it is characterized in that: at least one end of the crankshaft stretches out of the pump casing, and stretches out of the pump casing. The crankshaft end is connected to a direct drive motor. 2 . The plunger pump according to claim 1 , wherein the crankshaft is inserted into the rotor of the direct drive motor, and the crankshaft and the rotor are connected by expansion sleeves. 3 . 3. The plunger pump according to claim 2, wherein a flange connection plate is provided between the casing of the direct drive motor and the pump casing. 4. The plunger pump according to claim 2, characterized in that: the plunger pump also includes a plunger and a slider crank mechanism, and the direct drive motor drives the plunger through the slider crank mechanism to realize the plunger. reciprocating motion. 5. The plunger pump according to claim 2, wherein both ends of the crankshaft extend out of the pump casing.