Direct-drive servo pump device

Abstract

The invention discloses a direct-drive servo pump device which comprises a stator shell, a motor stator is fixedly connected to the interior of the stator shell, stator end covers are fixedly connected to the two ends of the stator shell, fixing cylinders are fixedly connected to one ends of the two stator end covers, a water seal head is fixedly connected to one end of each fixing cylinder, and a water pump is fixedly connected to the other end of each fixing cylinder. One side of each water seal head is fixedly connected with a high-pressure water chamber shell, one end of each high-pressure water chamber shell is fixedly connected with a water guide head, and a high-pressure water flow output device is arranged in each water guide head. The servo motor composed of the motor stator, the nut positioning seat and the nut drives the lead screw to repeatedly and rapidly move, the lead screw repeatedly and rapidly moves to drive the piston rod to repeatedly move, then continuous high-pressure water is generated, the control precision is high, and the output pressure of the generated high-pressure water is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure water generators, and in particular to a direct-drive servo pump device. Background Art

[0002] At present, in the field of high-pressure water generation, using an oil-driven water booster to generate high-pressure water is a common method. Based on the difference in the area of ​​the oil cylinder piston, the large piston drives the small piston of the high-pressure water to generate high pressure. That is, low-pressure hydraulic oil drives the oil cylinder piston to drive the small piston rod of the booster water chamber to reciprocate and generate high-pressure water.

[0003] In the above hydraulic system, factors such as oil temperature, oil leakage, valve switching hysteresis, etc. will have a significant impact on the stable pressure of high-pressure water. In order to make the generated high-pressure water output pressure stable, a direct-drive servo pump device is proposed. Summary of the invention

[0004] The present invention provides a direct-drive servo pump device to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A direct-drive servo pump device comprises a stator shell, wherein a motor stator is fixedly connected inside the stator shell, stator end covers are fixedly connected to both ends of the stator shell, one end of each of the two stator end covers is fixedly connected to a fixing cylinder, one end of each of the fixing cylinders is fixedly connected to a water seal head, one side of each of the water seal heads is fixedly connected to a high-pressure water chamber shell, one end of each of the high-pressure water chamber shells is fixedly connected to a water guide head, and each of the water guide heads is provided with a high-pressure water flow output device;

[0007] The two stator end covers are rotatably connected to rotor supports, a nut positioning seat is fixedly connected between the two rotor supports, a nut is fixedly connected to the nut positioning seat, the nut positioning seat is rotatably connected to the motor stator, the central thread of the nut is connected to a screw rod, both ends of the screw rod are fixedly connected to connecting rods, the connecting rods penetrate the rotor support and extend into the fixed cylinder, one end of each connecting rod is fixedly connected to a limiting plate, the limiting plate is slidably connected in the fixed cylinder, each limiting plate penetrates two limiting rods, each limiting rod is fixedly connected to the inner side wall of the fixed cylinder, one side of the limiting plate is fixedly connected to a piston rod, the piston rod penetrates the water seal head and extends into the high-pressure water chamber housing.

[0008] Preferably, the high-pressure water flow output device includes a high-pressure water outlet and a low-pressure water inlet, and the high-pressure water outlet and the low-pressure water inlet are provided on the outer wall of the water guide head. A water outlet channel and a water inlet channel are provided in the water guide head. One end of the water outlet channel is connected to the high-pressure water outlet, and the other end of the water outlet channel is connected to the internal through hole of the low-pressure water inlet. One end of the water inlet channel is connected to the low-pressure water inlet, and the other end of the water inlet channel is connected to the water outlet channel. A first one-way valve is provided on the water outlet channel, and a second one-way valve is provided on the water inlet channel.

[0009] Preferably, a cooling water inlet and a cooling water outlet are provided on the outer side wall of the stator case, and a cold water channel is provided inside the side wall of the stator case, and two ends of the cold water channel are respectively connected to the cooling water inlet and the cooling water outlet.

[0010] Preferably, the diameter of the through hole in the high-pressure water chamber housing is the same as the diameter of the piston rod.

[0011] Preferably, the nut positioning seat is a motor rotor, and the motor stator winding will generate a rotating magnetic field when alternating current is passed through it. The rotating magnetic field can drive the nut positioning seat to rotate forward and reversely, and the forward and reverse rotation of the nut positioning seat can drive the nut to rotate, and the forward and reverse rotation of the nut can drive the screw rod to move left and right.

[0012] Preferably, the two high-pressure water outlets are connected to the high-pressure water accumulator through pipes, a pressure sensor is provided in the output end of the high-pressure water accumulator, the output end of the high-pressure water accumulator is connected to the nozzle through a pipe, and a high-pressure water switch is provided on the nozzle.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention drives the screw rod to move repeatedly and rapidly through a servo motor composed of a motor stator, a nut positioning seat and a nut. The repeated rapid movement of the screw rod drives the piston rod to move repeatedly, thereby generating continuous high-pressure water. The control accuracy is high and the output pressure of the generated high-pressure water is stable.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1This is a schematic diagram of the overall structure of a direct-drive servo pump device proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of the connection between the inside of the stator shell and the inside of the fixing cylinder proposed by the present invention;

[0019] Figure 3 It is a schematic diagram of a front cross-sectional structure of a direct-drive servo pump device proposed by the present invention;

[0020] Figure 4 This is a schematic diagram of the front cross-sectional structure of the stator housing proposed by the present invention;

[0021] Figure 5 for Figure 3 A is a schematic diagram of the partially enlarged structure of the middle part;

[0022] Figure 6 This is a schematic diagram of the rotor support structure proposed by the present invention;

[0023] Figure 7 This is a schematic diagram of the filament structure proposed by the present invention;

[0024] Figure 8 Schematic diagram of the direct-drive servo pump device and system application proposed in the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. High-pressure water outlet; 2. Low-pressure water inlet; 3. High-pressure water chamber housing; 4. Fixing cylinder; 5. Stator end cover; 6. Cooling water inlet; 7. Cooling water outlet; 8. Water guide head; 9. Stator housing; 10. Water seal head; 11. Motor stator; 12. Limit plate; 13. Rotor bracket; 14. Nut positioning seat; 15. Nut; 16. Screw rod; 17. Water outlet channel; 18. First one-way valve; 19. Second one-way valve; 20. Water inlet channel; 21. Connecting rod; 22. Piston rod; 23. Limit rod; 24. Direct-drive servo pump device; 25. Pressure sensor; 26. High-pressure water accumulator; 27. High-pressure water switch. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0028] Embodiment 1

[0029] See also Figures 1 to 7In an embodiment of the present invention, a direct-drive servo pump device includes a stator housing 9, a motor stator 11 is fixedly connected inside the stator housing 9, stator end covers 5 are fixedly connected to both ends of the stator housing 9, one end of the two stator end covers 5 is fixedly connected to a fixing cylinder 4, one end of each fixing cylinder 4 is fixedly connected to a water seal head 10, one side of each water seal head 10 is fixedly connected to a high-pressure water chamber housing 3, one end of each high-pressure water chamber housing 3 is fixedly connected to a water guide head 8, and each water guide head 8 is provided with a high-pressure water flow output device;

[0030] The two stator end covers 5 are rotatably connected with rotor brackets 13, a nut positioning seat 14 is fixedly connected between the two rotor brackets 13, a nut 15 is fixedly connected in the nut positioning seat 14, the nut positioning seat 14 is rotatably connected in the motor stator 11, the central thread of the nut 15 is connected with a screw rod 16, both ends of the screw rod 16 are fixedly connected with connecting rods 21, the connecting rod 21 penetrates the rotor bracket 13 and extends into the fixed cylinder 4, one end of each connecting rod 21 is fixedly connected to the limiting disk 12, the limiting disk 12 is slidably connected in the fixed cylinder 4, each limiting disk 12 penetrates two limiting rods 23, each limiting rod 23 is fixedly connected to the inner side wall of the fixed cylinder 4, one side of the limiting disk 12 is fixedly connected with a piston rod 22, the piston rod 22 penetrates the water seal head 10 and extends into the high-pressure water chamber housing 3, and the diameter of the through hole in the high-pressure water chamber housing 3 is the same as the diameter of the piston rod 22.

[0031] Specifically, the high-pressure water flow output device includes a high-pressure water outlet 1 and a low-pressure water inlet 2, which are arranged on the outer wall of the water guide head 8, and a water outlet channel 17 and a water inlet channel 20 are arranged in the water guide head 8, one end of the water outlet channel 17 is connected to the high-pressure water outlet 1, and the other end of the water outlet channel 17 is connected to the internal through hole of the low-pressure water inlet 2, one end of the water inlet channel 20 is connected to the low-pressure water inlet 2, and the other end of the water inlet channel 20 is connected to the water outlet channel 17, a first one-way valve 18 is arranged on the water outlet channel 17, and a second one-way valve 19 is arranged on the water inlet channel 20, the second one-way valve 19 only allows water to flow from the low-pressure water inlet 2 to the high-pressure water chamber housing 3, and the first one-way valve 18 only allows water to flow from the high-pressure water chamber housing 3 to the high-pressure water outlet 1.

[0032] Specifically, a cooling water inlet 6 and a cooling water outlet 7 are provided on the outer wall of the stator shell 9, and a cold water channel (not shown) is provided in the side wall of the stator shell 9. The two ends of the cold water channel are respectively connected to the cooling water inlet 6 and the cooling water outlet 7. To ensure that the motor stator 11 works continuously for a long time, the motor stator 11 can be cooled when cold water continuously flows through the cold water channel.

[0033] The working principle of the present invention is:

[0034] The nut positioning seat 14 is the motor rotor. When alternating current is passed through the winding of the motor stator 11, a rotating magnetic field will be generated. The rotating magnetic field can drive the nut positioning seat 14 to rotate forward and backward. The forward and reverse rotation of the nut positioning seat 14 can drive the nut 15 to rotate. The forward and reverse rotation of the nut 15 can drive the screw rod 16 to move left and right. The left and right movement of the screw rod 16 can drive the piston rod 22 to move left and right in the high-pressure water chamber housing 3 through the connecting rod 21. After that, low-pressure water can be input through the low-pressure water inlet 2. After the low-pressure water is input into the high-pressure water chamber housing 3 from the water inlet channel 20, the piston rod 22 moves left and right repeatedly in the high-pressure water chamber housing 3 to squeeze the water flow and spray water out from the high-pressure water outlet 1 after passing through the water outlet channel 17, thereby generating continuous high-pressure water.

[0035] Embodiment 2

[0036] See also Figure 7 Specifically, the two high-pressure water outlets 1 are connected to the high-pressure water accumulator 26 through a pipeline. A pressure sensor 25 is provided in the output end of the high-pressure water accumulator 26. The output end of the high-pressure water accumulator 26 is connected to the nozzle through a pipeline. A high-pressure water switch 27 is provided on the nozzle. The nozzle can be used in combination with various types of water cutting machines. The pressure sensor 25 can detect the pressure of high-pressure water. By controlling the current intensity of the input motor stator 11, the rotation speed of the nut positioning seat 14 can be controlled to set different output pressures of high-pressure water to meet various working conditions.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A direct drive servo pump device, comprising a stator housing (9), characterized in that: The stator shell (9) is fixedly connected to the inside of the motor stator (11), and both ends of the stator shell (9) are fixedly connected to the stator end covers (5), one end of each of the two stator end covers (5) is fixedly connected to a fixing cylinder (4), one end of each of the fixing cylinders (4) is fixedly connected to a water seal head (10), one side of each of the water seal heads (10) is fixedly connected to a high-pressure water chamber shell (3), one end of each of the high-pressure water chamber shells (3) is fixedly connected to a water guide head (8), and each of the water guide heads (8) is provided with a high-pressure water flow output device; The two stator end covers (5) are both rotatably connected with a rotor support (13), a nut positioning seat (14) is fixedly connected between the two rotor supports (13), a nut (15) is fixedly connected inside the nut positioning seat (14), the nut positioning seat (14) is rotatably connected in the motor stator (11), a screw rod (16) is threadedly connected to the center of the screw rod (15), both ends of the screw rod (16) are fixedly connected with a connecting rod (21), the connecting rod (21) passes through the rotor support (13) and The connecting rod (21) extends into the fixed cylinder (4), one end of each connecting rod (21) is fixedly connected to a limiting plate (12), the limiting plate (12) is slidably connected in the fixed cylinder (4), each limiting plate (12) is penetrated by two limiting rods (23), each limiting rod (23) is fixedly connected to the inner wall of the fixed cylinder (4), one side of the limiting plate (12) is fixedly connected to a piston rod (22), the piston rod (22) penetrates the water seal head (10) and extends into the high-pressure water chamber housing (3).

2. A direct drive servo pump device according to claim 1, characterized in that: The high-pressure water flow output device comprises a high-pressure water outlet (1) and a low-pressure water inlet (2). The high-pressure water outlet (1) and the low-pressure water inlet (2) are arranged on the outer wall of a water guide head (8). A water outlet channel (17) and a water inlet channel (20) are arranged in the water guide head (8). One end of the water outlet channel (17) is in communication with the high-pressure water outlet (1), and the other end of the water outlet channel (17) is in communication with an internal through hole of the low-pressure water inlet (2). One end of the water inlet channel (20) is in communication with the low-pressure water inlet (2), and the other end of the water inlet channel (20) is in communication with the water outlet channel (17). A first one-way valve (18) is arranged on the water outlet channel (17), and a second one-way valve (19) is arranged on the water inlet channel (20).

3. A direct drive servo pump device according to claim 2, characterized in that: The outer wall of the stator case (9) is provided with a cooling water inlet (6) and a cooling water outlet (7), and the side wall of the stator case (9) is provided with a cold water channel, and the two ends of the cold water channel are respectively connected to the cooling water inlet (6) and the cooling water outlet (7).

4. A direct drive servo pump device according to claim 3, characterized in that: The diameter of the through hole in the high-pressure water chamber housing (3) is the same as the diameter of the piston rod (22).

5. A direct drive servo pump device according to claim 4, characterized in that: The nut positioning seat (14) is a motor rotor. When alternating current is passed through the motor stator (11) winding, a rotating magnetic field is generated. The rotating magnetic field can drive the nut positioning seat (14) to rotate forward and reversely. The forward and reverse rotation of the nut positioning seat (14) can drive the nut (15) to rotate. The forward and reverse rotation of the nut (15) can drive the screw rod (16) to move left and right.

6. A direct drive servo pump device according to claim 5, characterized in that: The two high-pressure water outlets (1) are connected to a high-pressure water accumulator (26) through a pipeline, a pressure sensor (25) is provided in the output end of the high-pressure water accumulator (26), and the output end of the high-pressure water accumulator (26) is connected to a nozzle through a pipeline, and a high-pressure water switch (27) is provided on the nozzle.

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