An energy-saving and explosion-proof servo CNC piston pump

Abstract

This utility model discloses an energy-saving and explosion-proof servo CNC plunger pump, relating to the field of oilfield injection pump technology. It includes a base, with a reciprocating pumping mechanism on the top of the base for continuous reciprocating pumping. The reciprocating pumping mechanism includes a drive unit and a reciprocating unit. An explosion-proof servo hollow screw motor directly drives the ball screw nut, causing the screw to perform precise reciprocating motion. This eliminates the need for traditional belt drives and crank mechanisms, thus eliminating friction loss and energy waste caused by intermediate transmissions. Both directions of the screw's motion are used for effective work, completely eliminating the problem of energy loss during idle strokes, significantly improving overall efficiency—more than 10% higher than traditional asynchronous motors under the same conditions. The direct-drive connection effectively reduces vibration loss; the extended plunger design reduces the reciprocating speed, significantly reducing friction loss between the plunger and the sealing and guide sleeve components, extending the equipment's service life.

Description

Technical Field

[0001] This utility model relates to the field of oilfield injection pump technology, specifically an energy-saving and explosion-proof servo CNC plunger pump. Background Technology

[0002] A plunger pump relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working cavity, thereby achieving the functions of pumping liquid and pressing water.

[0003] According to the patent titled "A Plunger Pump" (patent publication number: CN213711253U, patent publication date: 2021-07-16), it includes a split frame and a hydraulic cylinder mounted on one side of the split frame. Multiple independent power systems are installed within the split frame. Each power system includes a crank-connecting rod mechanism connected to a plunger assembly mechanism via a tappet. A set of suction and discharge valve assemblies, cooperating with the plunger assembly mechanism, is installed within the hydraulic cylinder cavity and located on the upper and lower sides of the plunger assembly mechanism's end, respectively connected to the cylinder's suction and discharge pipes. By installing a sealing, dustproof, and oil emulsification-preventing device at the slide port of the split frame, dust, sand, and other impurities in the environment cannot enter the frame along with the tappet during linear reciprocating motion, ensuring the reliability of the lubricating oil and increasing the device's service life.

[0004] Based on the aforementioned existing technology, the current energy-saving and explosion-proof servo CNC piston pump still has the following problems: the existing piston pump usually pumps liquid (water, oil or other liquids) through a crank piston. The principle of the crank piston is to compress forward and pump backward. However, the pressure is large, while the pumping pressure is only one percent of the pressure pressure, resulting in half of the crank movement not doing work to pump liquid. Therefore, this utility model provides an energy-saving and explosion-proof servo CNC piston pump. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an energy-saving and explosion-proof servo CNC piston pump, which solves the following problems that existing energy-saving and explosion-proof servo CNC piston pumps still have: Existing piston pumps usually pump liquid (water, oil or other liquids) through a crank piston. The principle of the crank piston is to compress forward and pump backward. However, the pressure is large, while the pumping pressure is only one percent of the pressure pressure, resulting in half of the crank movement not doing work to pump liquid.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving and explosion-proof servo CNC plunger pump, comprising a base, wherein a reciprocating pumping mechanism is provided on the top of the base for continuous reciprocating pumping of liquid, the reciprocating pumping mechanism comprising:

[0007] The drive unit is located on the top of the base and is used to drive the reciprocating unit;

[0008] A reciprocating unit is disposed above the base and includes a lead screw. A first plunger is rotatably mounted on the right end of the lead screw, and a second plunger is rotatably mounted on the left end of the lead screw. The reciprocating movement of the first plunger and the second plunger is achieved by moving the lead screw left and right.

[0009] Preferably, the drive unit includes a fixed frame fixedly installed on the top of a fixed frame on the top of the base, a right mounting frame fixedly installed on the upper right side of the base, and a left mounting frame fixedly installed on the upper left side of the base, and two sets of connecting rods fixedly installed between the fixed frame and the right and left mounting frames.

[0010] Preferably, an explosion-proof servo hollow screw motor is fixedly installed on the left side of the fixing frame, and a ball screw nut is rotatably installed inside the fixing frame. The output end of the explosion-proof servo hollow screw motor is fixedly connected to the ball screw nut, and the screw thread is rotatably installed inside the ball screw nut.

[0011] Preferably, a first pump head is fixedly installed inside the right mounting bracket, and a second pump head is fixedly installed inside the left mounting bracket. The first plunger slides inside the first pump head, and the second plunger slides inside the second pump head.

[0012] Preferably, the first pump head and the second pump head are respectively provided with an inlet and an outlet, and the inlet is provided with a one-way inlet valve and the outlet is provided with a one-way outlet valve to realize the one-way pumping and pressing functions.

[0013] Preferably, the plunger pump adopts a modular design, and multiple reciprocating pumping mechanisms can be used in parallel. The segmented start-up and shutdown and flow fine-tuning are achieved through electrical control to adapt to different working conditions.

[0014] This invention provides an energy-saving and explosion-proof servo CNC piston pump. Compared with the prior art, it has the following advantages:

[0015] 1. This energy-saving, explosion-proof servo CNC plunger pump directly drives the ball screw nut via an explosion-proof servo hollow screw motor, causing the screw to perform precise reciprocating motion. This eliminates the need for traditional belt drives and crank mechanisms, thus eliminating frictional losses and energy waste caused by intermediate transmissions. Both directions of the screw's motion are used for effective work, completely eliminating the problem of energy loss during idle strokes, significantly improving overall efficiency—more than 10% higher than traditional asynchronous motors under the same conditions. The direct-acting connection effectively reduces vibration losses; the extended plunger design lowers the reciprocating speed, significantly reducing frictional losses between the plunger and the sealing and guide sleeve components, extending the equipment's service life. Simultaneously, during the screw's forward and backward movement, one end presses liquid while the other pumps liquid, achieving continuous and uninterrupted work, further improving energy utilization and output stability.

[0016] 2. This energy-saving and explosion-proof servo CNC plunger pump adopts a modular design, supporting the parallel combination of multiple reciprocating pumping mechanisms. Through electrical control, it achieves flow segmentation, start / stop adjustment, and remote management, enabling modular installation and flexible expansion to meet different working conditions. The lightweight modular design requires only a 1-ton hoist for lifting, eliminating the need for large cranes and significantly reducing installation and maintenance costs. The unified structure of each functional unit and standardized parts allow for interchangeability of components with the same function, greatly reducing inventory types and maintenance difficulty, and improving on-site maintenance efficiency. Combined with an intelligent control system, it supports remote monitoring and management via a big data cloud platform, reducing the frequency of manual inspections and labor costs. Employing a double-layer mechanical seal and hydraulic self-balancing structure, it connects the high-pressure outlet end to the plunger sealing end via a connecting pipe, achieving automatic isobaric sealing, significantly improving sealing reliability and service life, and reducing the frequency of periodic maintenance. Attached Figure Description

[0017] Figure 1 This is a right-side perspective view of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional perspective view of the present invention.

[0019] Figure 3 This is a partial three-dimensional structural view of the right side of this utility model;

[0020] Figure 4 This is a partial three-dimensional structural view of the left side of this utility model.

[0021] In the figure: 1-base, 2-reciprocating pumping mechanism, 21-drive unit, 211-fixed frame, 212-explosion-proof servo hollow screw motor, 213-right mounting bracket, 214-left mounting bracket, 215-connecting rod, 216-ball screw nut, 22-reciprocating unit, 221-screw, 222-first plunger, 223-first pump head, 224-second plunger, 225-second pump head. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 This utility model provides a technical solution:

[0024] An energy-saving and explosion-proof servo CNC plunger pump includes a base 1, and a reciprocating pumping mechanism 2 is provided on the top of the base 1 for continuous reciprocating pumping of liquid. The reciprocating pumping mechanism 2 includes:

[0025] The drive unit 21 is disposed on the top of the base 1 and is used to drive the reciprocating unit 22;

[0026] The reciprocating unit 22 is located above the base 1 and includes a lead screw 221. A first plunger 222 is rotatably mounted on the right end of the lead screw 221, and a second plunger 224 is rotatably mounted on the left end of the lead screw 221. The first plunger 222 and the second plunger 224 reciprocate by moving the lead screw 221 left and right.

[0027] In this embodiment, the drive unit 21 includes a fixed frame 211 fixedly installed on the top of the base 1, a right mounting frame 213 fixedly installed on the upper right side of the base 1, and a left mounting frame 214 fixedly installed on the upper left side of the base 1. Two sets of connecting rods 215 are fixedly installed between the fixed frame 211 and the right mounting frame 213 and the left mounting frame 214.

[0028] It provides a precise and stable mounting base for the drive unit 21 and the reciprocating unit 22, effectively resisting various stresses and vibrations generated during operation, ensuring the long-term alignment and smooth operation of core moving components such as the explosion-proof servo hollow screw motor 212, ball screw nut 216, screw 221 and plunger, thereby ensuring the reliability and durability of the entire pump body structure.

[0029] In this embodiment, an explosion-proof servo hollow screw motor 212 is fixedly installed on the left side of the fixing frame 211, and a ball screw nut 216 is rotatably installed inside the fixing frame 211. The output end of the explosion-proof servo hollow screw motor 212 is fixedly connected to the ball screw nut 216, and the screw 221 is threadedly rotatably installed inside the ball screw nut 216.

[0030] The output shaft of the explosion-proof servo hollow screw motor 212 is directly connected to the ball screw nut 216, eliminating intermediate transmission links such as belts and gears, thus eliminating the efficiency loss, slippage, wear, and maintenance problems they cause. The result is high-precision CNC control of the linear reciprocating motion of the screw 221. The high efficiency and fast response characteristics of the servo motor itself, combined with the high transmission efficiency of the ball screw pair, significantly improve the energy utilization and motion control accuracy of the entire drive system, laying a solid foundation for energy saving and digital control of the pump.

[0031] In this embodiment, a first pump head 223 is fixedly installed inside the right mounting bracket 213, and a second pump head 225 is fixedly installed inside the left mounting bracket 214. A first plunger 222 slides inside the first pump head 223, and a second plunger 224 slides inside the second pump head 225.

[0032] Mechanical energy is converted into hydraulic energy. The first pump head 223 and the second pump head 225 serve as sealed pressure vessels, forming independent sealed working cavities with the first plunger 222 and the second plunger 224, respectively. This arrangement ensures that the first pump head 223, the second pump head 225, and their plungers, the first plunger 222 and the second plunger 224, are symmetrically distributed around the screw 221, resulting in a compact structure. The effect is to achieve synchronous operation of the two cylinders; the compression stroke of one plunger 222 or 224 occurs simultaneously with the suction stroke of the other plunger 224 or 222, providing a core structural guarantee for subsequent continuous, stable, and pulsation-free fluid output.

[0033] In this embodiment, the first pump head 223 and the second pump head 225 are respectively provided with an inlet and an outlet, and a one-way inlet valve is provided at the inlet and a one-way outlet valve is provided at the outlet to realize the one-way pumping and pressing functions.

[0034] The directional delivery of fluid is achieved through a valve control system. The one-way inlet valve and one-way outlet valve are key components controlling the unidirectional flow of fluid, effectively defining the working cycle of the first pump head 223 and the second pump head 225: when the first plunger 222 or the second plunger 224 performs a return stroke to draw in fluid, a negative pressure is created in the pump chamber, the inlet one-way valve opens to draw in fluid, and the outlet one-way valve closes to prevent backflow; when the first plunger 222 or the second plunger 224 performs a forward compression stroke, the pressure in the pump chamber increases, forcing the outlet one-way valve to open to discharge fluid, while the inlet one-way valve closes to prevent backflow. This design ensures that the pumping and compression processes are carried out efficiently and orderly, a necessary condition for realizing the pumping function.

[0035] In this embodiment, the plunger pump adopts a modular design, and multiple reciprocating pumping mechanisms 2 can be used in parallel. The segmented start-up and shutdown and flow fine adjustment are realized through electrical control to adapt to different working conditions.

[0036] Integrating the complete reciprocating pumping mechanism 2 as a standard functional unit significantly enhances the product's flexibility, scalability, and ease of maintenance. Users can combine multiple modules in parallel, like building blocks, according to actual flow and pressure requirements. A central controller allows for independent and precise start / stop and speed adjustment of the explosion-proof servo hollow screw motor 212 in each module, achieving stepless fine-tuning and efficient matching of the total flow rate. Furthermore, this design supports standby and rotational operation; a single module failure does not affect the overall system operation, significantly improving system reliability, maintainability, and overall lifecycle economic benefits.

[0037] The base 1 is made of QT450 lost foam casting, with a length of 1200mm and a width of 500mm. The positioning surface is machined by a milling machine to ensure a flatness of ≤0.03mm.

[0038] The explosion-proof servo hollow screw motor 212, model YBX3-160M, has a power of 15kW and an explosion-proof rating of Ex dⅡCT4.

[0039] The lead screw 221 model is 8020, with a length of 830mm and a lead of 20mm;

[0040] The first and second plungers are 75mm in diameter and 600mm in length, made of 316L stainless steel, with a 5μm thick DLC coating on the surface.

[0041] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0042] During operation, the explosion-proof servo hollow screw motor 212 starts and drives the ball screw nut 216 to rotate, thereby driving the screw 221 to perform precise left and right reciprocating motion inside the ball screw nut 216. The right end of the screw 221 is rotatably mounted with a first plunger 222, and the left end is rotatably mounted with a second plunger 224. The left and right movement of the screw 221 causes the first plunger 222 and the second plunger 224 to reciprocate and slide in the first pump head 223 fixed in the right mounting bracket 213 and the second pump head 225 fixed in the left mounting bracket 214, respectively.

[0043] When the lead screw 221 moves to the right, the first plunger 222 performs a compression stroke within the first pump head 223. At this time, the one-way outlet valve of the first pump head 223 opens, and the one-way inlet valve closes, achieving liquid compression. Simultaneously, the second plunger 224 performs a suction stroke within the second pump head 225. The one-way inlet valve of the second pump head 225 opens, and the one-way outlet valve closes, achieving liquid extraction. Conversely, when the lead screw 221 moves to the left, the first plunger 222 performs suction, and the second plunger 224 performs compression, thus achieving alternating suction and compression by the two pump heads, ensuring continuous fluid output.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving explosion-proof servo numerical control plunger pump comprising a base (1), characterized in that: The top of the base (1) is provided with a reciprocating pumping mechanism (2) for continuous reciprocating pumping of liquid. The reciprocating pumping mechanism (2) includes: A drive unit (21) is disposed on the top of the base (1) and is used to drive the reciprocating unit (22); The reciprocating unit (22) is located above the base (1) and includes a lead screw (221). A first plunger (222) is rotatably mounted on the right end of the lead screw (221), and a second plunger (224) is rotatably mounted on the left end of the lead screw (221). The first plunger (222) and the second plunger (224) reciprocate by moving the lead screw (221) left and right.

2. The energy-saving explosion-proof servo numerical control plunger pump according to claim 1, characterized in that: The drive unit (21) includes a fixed frame (211) fixedly installed on the top of the base (1), a right mounting frame (213) fixedly installed on the upper right side of the base (1), and a left mounting frame (214) fixedly installed on the upper left side of the base (1). Two sets of connecting rods (215) are fixedly installed between the fixed frame (211) and the right mounting frame (213) and the left mounting frame (214).

3. The energy-saving and explosion-proof servo numerical control plunger pump according to claim 2, characterized in that: An explosion-proof servo hollow screw motor (212) is fixedly installed on the left side of the fixed frame (211). A ball screw nut (216) is rotatably installed inside the fixed frame (211). The output end of the explosion-proof servo hollow screw motor (212) is fixedly connected to the ball screw nut (216). The screw (221) is threadedly rotatably installed inside the ball screw nut (216).

4. The energy-saving and explosion-proof servo numerical control plunger pump according to claim 2, characterized in that: The right mounting bracket (213) has a first pump head (223) fixedly installed inside, and the left mounting bracket (214) has a second pump head (225) fixedly installed inside. The first plunger (222) slides inside the first pump head (223), and the second plunger (224) slides inside the second pump head (225).

5. The energy-saving anti-explosion servo numerical control plunger pump according to claim 4, characterized in that: The first pump head (223) and the second pump head (225) are respectively provided with an inlet and an outlet. The inlet is provided with a one-way inlet valve and the outlet is provided with a one-way outlet valve to realize the one-way pumping and pressing functions.

6. The energy-saving and explosion-proof servo CNC piston pump according to claim 1, characterized in that: The plunger pump adopts a modular design, and multiple reciprocating pumping mechanisms (2) can be used in parallel. The segmented start-up and stop and flow fine adjustment are achieved through electrical control to adapt to different working conditions.

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