An electric screw self-priming high-pressure plunger pump device

Abstract

The present invention discloses an electric screw self-priming high-pressure plunger pump device, which solves the problem of electric multi-point pumps being unable to refill oil and requiring an external filling system for refilling, and also solves the problem of single-screw pumps being unable to produce high pressure. The device is constructed by connecting an electric multi-point pump with a single-screw pump rod, creating a dual-pump system. The electric multi-point pump plunger unit is responsible for precisely metered, high-pressure fluid delivery, while the single-screw pump rod is responsible for delivering fluid to the electric multi-point pump plunger unit. This simplifies the fluid delivery process from start to finish, making the structure more compact and simpler. In particular, the cost of fluid delivery is significantly reduced, with the cost of using the equipment reduced by at least 40%.

Description

Technical Field

[0001] The present invention belongs to the technical field of centralized automatic lubrication systems, and in particular relates to a novel electric screw self-priming high-pressure plunger pump device. Background Art

[0002] With the increasing sophistication of industrialization, the maintenance and upkeep of large-scale machinery, such as manufacturing equipment and construction machinery, is becoming increasingly important. A key aspect of this maintenance and upkeep is the lubrication of operating parts. Traditionally, lubrication was performed manually with oil, a method with numerous drawbacks: difficulty in management, environmental pollution, and high labor costs. Centralized automatic lubrication systems overcome these shortcomings and have gained widespread adoption. A key component of centralized automatic lubrication systems is the grease pump. Grease pumps come in a variety of configurations, including electric, pneumatic, and hydraulic. Electric multi-point pumps are the most widely used. Traditionally, electric multi-point pumps utilize an electric reducer unit to provide power, driving the eccentric shaft assembly for rotational motion. The eccentric shaft assembly, in turn, drives the plunger unit for reciprocating motion. During this reciprocating motion, the plunger unit completes a precise, quantitative oil suction and discharge cycle. The plunger unit is immersed in a custom grease barrel, which is refilled by an external filling system. Electric multi-point pumps lack self-refilling capabilities. The external filling system generally requires another set of barrel pumps to extract the grease from the standard barrel and add it to the customized oil barrel of the electric multi-point pump. The barrel pump has the function of fluid transportation, but does not have the multi-point quantitative and high-pressure output functions. Summary of the Invention

[0003] The present invention combines a traditional electric multi-point pump with a single screw pump rod to invent a new type of electric screw self-priming high-pressure plunger pump device. A single mechanism has dual pump functions, which solves the problem that the electric multi-point pump cannot replenish oil and requires an external filling system to replenish oil, and solves the problem that the single screw pump cannot produce high pressure.

[0004] The technical solution adopted by the present invention is as follows: the electric reducer provides power to drive the eccentric shaft assembly and the screw rotor to perform rotary motion synchronously. The upper eccentric shaft assembly drives the plunger unit to perform reciprocating motion. During the reciprocating motion, the plunger unit completes the precise quantitative high-pressure oil suction and discharge cycle. The lower screw mechanism consists of a screw rotor with an eccentric spiral body and a screw stator with a double-line helical surface on the inner surface. On the one hand, the screw rotates around its own axis, and on the other hand, it rolls along the inner surface of the bushing, thus forming a sealed chamber of the pump. With each rotation of the screw, the liquid in the sealed chamber advances one pitch. As the screw continues to rotate, the fluid is pressed from one sealed chamber to another in a spiral manner, and finally squeezed out of the pump body and transported to the upper part for use by the electric multi-point pump plunger unit.

[0005] Compared with the existing technology, the beneficial effect of the present invention is that a single structure realizes the dual pump function. The screw part of the screw pump can be directly inserted into the standard grease barrel to be responsible for the initial fluid delivery, and then the electric multi-point pump plunger unit is responsible for multi-point quantitative and high-pressure delivery of the fluid to each distribution unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a diagram of the invented new structure (Appendix 1).

[0007] surface Structural Diagram Name Table

[0008] Serial number name Serial number name Serial number name ① screw rotor ⑨ Deep groove ball bearings ⑰ coat ② Double-wire helical screw stator ⑩ Eccentric shaft ⑱ One-way valve core ③ Parallel Sales ⑪ Cylindrical roller bearings ⑲ Round wire compression spring ④ connecting rod ⑫ Plunger seat ⑳ Round wire compression spring ⑤ Deep groove ball bearings ⑬ reducer ㉑ Displacement adjusting nut ⑥ Plunger pull disc ⑭ Three-phase motor ㉒ Pin joint ⑦ Parallel Sales ⑮ plunger ㉓ Oil return flange ⑧ Flat key shaft ⑯ valve core ㉔ cover DETAILED DESCRIPTION

[0009] The following is the implementation method of the new structure.

[0010] 1) ⑭ three-phase motor and ⑬ reducer form a unit, providing power for rotary motion. ⑩ eccentric shaft is connected to ⑬ reducer shaft through a flat key, driving ⑩ eccentric shaft and ⑥ plunger pull plate on the eccentric shaft to rotate.

[0011] 2) The head boss of the plunger (⑮) fits into the groove of the plunger pull plate (⑥). Driven by the eccentric shaft, the plunger reciprocates. When the plunger (⑮) moves away from the valve core (⑯), the valve port of the one-way valve core (⑱) is closed by the pressure of the circular compression spring (⑲). The volume of the sealed cavity formed by the plunger (⑮) and the valve core (⑯) gradually increases, creating a vacuum and sucking in the oil.

[0012] 3) When the ⑮ plunger moves back, the plunger squeezes the closed cavity composed of the ⑮ plunger and the ⑯ valve core. The fluid in the cavity forms high pressure and drives the ⑯ valve core to move backward. During the movement, the oil port of the closed cavity opens, and the high-pressure fluid pushes open the ⑱ one-way valve core, squeezing out the grease, and then the cycle continues.

[0013] 4) The ⑧ flat key shaft is connected to the ⑩ eccentric shaft via a flat key, and rotates synchronously with the eccentric shaft. One end of the ④ connecting rod is connected to the ⑧ flat key shaft via the ⑦ parallel pin and the ㉒ pin socket, and the other end is connected to the ① screw rotor via the ③ parallel pin. Both ends of the connecting rod are spherical universal joints.

[0014] 5) Driven by the connecting rod (④) and the keyed shaft (⑧), the screw rotor (①) rotates around its own axis while rolling along the inner surface of the double-helical screw stator (②), thus forming the pump's sealed chamber. With each revolution of the screw rotor (①), the fluid in the sealed chamber is pushed forward by one pitch. As the screw rotor (①) continues to rotate, the fluid is pressed spirally from one sealed chamber to the other, ultimately squeezing out of the pump rod and transported to the upper electric multi-point pump plunger unit.

[0015] Figure 2 This is an example of a new structural application.

[0016] The new structure can directly extract grease from a standard grease barrel and distribute it quantitatively at multiple points.

[0017] Figure 3 This is an example of the current structure (for comparison with the new structure).

[0018] Through comparison, it was found that the new structure has the characteristics of multi-function in one machine and compact structure, and greatly reduces the cost of equipment use.

Claims

1. An electric screw self-priming high-pressure plunger pump device, characterized in that: It is composed of an electric multi-point pump and a single screw pump rod connected to form a dual-pump function. The electric multi-point pump plunger unit is responsible for accurately quantitative and high-pressure fluid delivery, and the single screw pump rod is responsible for delivering fluid to the electric multi-point pump plunger unit. It also includes a flat key shaft for connecting the multi-point pump and the screw pump rod to transmit power; It also includes an oil return flange for locking and fixing the screw pump rod and the multi-point pump cover together to form an integrated structure; It also includes a universal connection method in which the connecting rod in the screw pump rod, the screw stator and the flat key shaft adopt a pin and a pin sleeve; Specifically, a three-phase motor and a reducer form a unit, which provides power for the rotary motion. The eccentric shaft is connected to the reducer shaft through a flat key, driving the eccentric shaft and the plunger pull plate on the eccentric shaft to rotate. The head boss of the plunger is embedded in the groove of the plunger pull plate. Driven by the eccentric shaft, the plunger makes reciprocating motion. When the plunger moves away from the valve core, the valve port of the one-way valve core is closed under the pressure of the circular compression spring. The volume of the closed cavity formed by the plunger and the valve core gradually increases, forming a vacuum and sucking up the oil. When the plunger moves back, the plunger squeezes the closed cavity formed by the plunger and the valve core. The fluid in the cavity forms high pressure and drives the valve core to move backward. During the movement, the oil port of the closed cavity opens, and the high-pressure fluid pushes the one-way valve core open, squeezing out the grease, and then the cycle continues; The flat key shaft is connected to the eccentric shaft through a flat key and rotates synchronously under the drive of the eccentric shaft; one end of the connecting rod is connected to the flat key shaft through a parallel pin and a pin sleeve, and the other end is connected to the screw rotor through a parallel pin. Both ends of the connecting rod are spherical universal joints. Driven by the connecting rod and the flat key shaft, the screw rotor rotates around its own axis on the one hand, and rolls along the inner surface of the double-helical screw stator on the other hand, thus forming a sealed chamber of the pump; every time the screw rotor rotates one circle, the fluid in the sealed chamber advances one pitch. As the screw rotor continues to rotate, the fluid is pressed from one sealed chamber to another in a spiral manner, and finally squeezed out of the pump rod and transported to the upper electric multi-point pump plunger unit.

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