Stator and screw pump

Abstract

This invention belongs to the field of screw pumps, specifically relating to a screw pump including a pump body housing, a stator housing, a main shaft, a quick-release rotor, and a connecting mechanism. The main shaft is disposed within the pump body housing, with one end connected to a drive unit and the other end connected to the quick-release rotor via the connecting mechanism. The quick-release rotor is disposed within the stator housing. The connecting mechanism is used to rotate and connect the main shaft and the quick-release rotor. Compared to existing technologies, this invention improves the installation and maintenance efficiency of screw pumps, saving time and labor costs. The stator housing is designed with a wave-shaped structure of uniform wall thickness, resulting in greater reliability and longer service life. Replacement is convenient and maintenance is easy. The uniform wall thickness and reliable rotor dynamic balance ensure stable pump operation.

Description

Technical Field

[0001] This invention belongs to the field of screw pumps, specifically relating to a stator and a screw pump. Background Technology

[0002] A screw pump, also known as a "screw pump" or "Archimedes screw pump," is a type of pump that uses the rotation of helical blades to propel water upwards in a spiral motion along the axis. It consists of a shaft, helical blades, and a casing. During pumping, the pump is placed at an angle in the water, with the angle of the pump shaft smaller than the angle of the helical blades, and the lower end of the helical blades in contact with the water. When the prime mover drives the screw pump shaft to rotate via a speed-changing device, water enters the blades and rises along the spiral flow path until it exits. It has a simple structure, is easy to manufacture, has a large flow rate, low head loss, and high efficiency. It is also easy to maintain and repair. However, it has a low head and low speed, requiring a speed-changing device. It is widely used for irrigation, drainage, and lifting sewage and sludge.

[0003] Existing screw pumps consist of a stator and a rotor. If the rotor is connected by welding or other methods, it leads to difficulties in installation and maintenance. Using screws or other methods results in low efficiency during installation and disassembly. Therefore, a quick-assembly structure for the rotor is designed to enable rapid disassembly and assembly, facilitating maintenance and cleaning. Furthermore, the stator housing in existing technologies is typically a cylindrical structure, and its uneven wall thickness leads to unstable rotor dynamic balance. Summary of the Invention

[0004] The purpose of this invention is to provide a stator and a screw pump to solve the problems existing in the prior art. To achieve the above-mentioned objective, the technical solution adopted by this invention is as follows:

[0005] A screw pump includes a pump body housing, a stator housing, a main shaft, a quick-release rotor, and a connecting mechanism;

[0006] The main shaft is installed inside the pump body housing. One end of the main shaft is connected to the drive unit, and the other end is connected to the quick-release rotor through the connecting mechanism. The quick-release rotor is installed inside the stator housing.

[0007] The connecting mechanism is used to rotate and connect the main shaft and the quick-release rotor.

[0008] Furthermore, the connecting mechanism includes a connecting sleeve, a limiting ring sleeve, and a fixing protrusion;

[0009] The connecting sleeve is provided with an open mounting cavity, one end of the main shaft is inserted into the mounting cavity, the fixing protrusion is fixedly connected to the outer side of the main shaft, and the limiting ring is connected to the inner wall of the connecting sleeve.

[0010] Furthermore, the limiting ring sleeve is provided with a notch that matches the fixing protrusion. The fixing protrusion passes through the notch and is offset from the notch. The fixing protrusion abuts against the end face of the limiting ring sleeve, thereby forming an axial constraint.

[0011] Furthermore, the outer ring of the limiting ring sleeve is fixedly connected to a fixing ring, and the fixing ring is detachably connected to the mounting cavity.

[0012] Furthermore, the outer side of the connecting sleeve is fixedly connected to a first ring plate, and the main shaft is fixedly connected to a second ring plate. The second ring plate is provided with a limiting pin, and the first ring plate is provided with a limiting hole. The limiting pin is inserted into the limiting hole to form a circumferential limiting structure.

[0013] Furthermore, the limiting hole has an arc-shaped structure, which includes an arc-shaped segment, a large hole segment, and a radial segment;

[0014] The arc-shaped segment is provided with a large hole segment and a radial segment at both ends, the inner diameter of the large hole segment is greater than the width of the arc-shaped segment and the radial segment, the radial segment is located in the radial direction of the first ring plate, and the arc-shaped segment is located in the circumferential direction of the first ring plate;

[0015] One end of the limiting pin passes through the limiting hole and is provided with a limiting part. The width of the limiting part is greater than the diameter of the limiting pin. The limiting pin is used to pass through the large hole section, and when the second ring plate rotates, the limiting part abuts against the first ring plate.

[0016] When the limiting pin is located in the radial section, the fixing protrusion is offset from the notch. When the limiting pin is located in the large hole section, the fixing protrusion is located in the direction of the notch.

[0017] Furthermore, the second ring plate is provided with an oblong hole and a sliding hole in the radial direction. One end of the oblong hole is connected to one end of the sliding hole, and the other end of the sliding hole is provided with an opening on the circumferential surface of the second ring plate. The limiting pin passes through the oblong hole, and one end of the sliding rod is fixedly connected to the side of the limiting pin. The other end of the sliding rod slidably passes through the sliding hole. A spring is sleeved on the sliding rod to push the limiting pin to move toward the radial segment.

[0018] A stator, wherein the stator housing has a wave-shaped structure.

[0019] The present invention has the following advantages: compared with the prior art, the present invention improves the installation and maintenance efficiency of screw pumps, and saves time and labor costs; the present invention designs the stator shell as a wave-shaped structure with uniform wall thickness, which is more reliable and has a longer service life; replacement is convenient and maintenance is easy; the uniform wall thickness and reliable rotor dynamic balance ensure stable pump operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the connecting mechanism;

[0022] Figure 3 Schematic diagram for fixing the protrusion and notch;

[0023] Figure 4 This is a schematic diagram of the limiting hole;

[0024] Figure 5 This is a schematic diagram of the second ring plate. Detailed Implementation

[0025] The following will refer to the appendices in the embodiments of the present invention. Figures 1-5 The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0026] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] like Figure 1 A screw pump includes a pump body housing 1, a stator housing 4, a main shaft 2, a quick-release rotor 5, and a connecting mechanism 3;

[0028] The main shaft 2 is installed inside the pump body housing 1. One end of the main shaft 2 is connected to the drive part, and the other end is connected to the quick-release rotor 5 through the connecting mechanism 3. The quick-release rotor 5 is installed inside the stator housing 4.

[0029] The connecting mechanism 3 is used to rotate to connect the main shaft 2 and the quick-release rotor 5.

[0030] Specifically, the drive unit is based on existing technology, such as an electric motor, which is installed at the tail end of the pump housing 1. The purpose of the connecting mechanism 3 and the quick-release rotor 5 is to enable the quick disassembly and installation of the quick-release rotor 5, allowing for rapid connection between the quick-release rotor 5 and the main shaft 2, facilitating installation and maintenance. Compared with existing technologies, this invention improves the installation and maintenance efficiency of the screw pump, saving time and labor costs.

[0031] like Figures 1-3 The connecting mechanism 3 includes a connecting sleeve 301, a limiting ring sleeve 303, and a fixing protrusion 304;

[0032] The connecting sleeve 301 is provided with an open mounting cavity. One end of the main shaft 2 is inserted into the mounting cavity. The fixing protrusion 304 is fixedly connected to the outer side of the main shaft 2. The limiting ring 303 is connected to the inner wall of the connecting sleeve 301.

[0033] The connecting sleeve 301 has an overall cylindrical structure, with one end open and the other end closed and fixedly connected to one end of the quick-release rotor 5. The limiting ring sleeve 303 is sleeved on the main shaft 2 and is distributed coaxially with the main shaft 2.

[0034] Furthermore, the limiting ring sleeve 303 is provided with a notch that matches the fixing protrusion 304. The fixing protrusion 304 passes through the notch and is offset from the notch. The fixing protrusion 304 abuts against the end face of the limiting ring sleeve 303, thereby forming an axial constraint.

[0035] Specifically, the notch is located on the circumferential surface of the limiting ring 303. When the spindle 2 is inserted into the mounting cavity of the connecting sleeve 301, the notch is first aligned with the fixed protrusion 304, causing the fixed protrusion 304 to move inward along the notch, thereby moving the fixed protrusion 304 into the space between the end of the limiting ring 303 and the end of the mounting cavity. Then, the connecting sleeve 301 is rotated to displace the fixed protrusion 304 from the notch, thereby achieving axial constraint between the connecting sleeve 301 and the spindle 2.

[0036] Furthermore, the outer ring of the limiting ring sleeve 303 is fixedly connected to the fixing ring 305, and the fixing ring 305 is detachably connected to the mounting cavity.

[0037] Specifically, the fixing ring 305 is sleeved on the limiting ring sleeve 303. The mounting cavity has a stepped structure, including three steps. The first step has the smallest inner diameter and the main shaft 2 is located therein. The limiting ring sleeve 303 and the fixing protrusion 304 are set in the second step. The third step has the largest inner diameter and the fixing ring 305 is located therein. The end face of the fixing ring 305 is connected to the connecting sleeve 301 by multiple bolts 306, so that the limiting ring sleeve 303 is firmly connected in the mounting cavity.

[0038] like Figure 2 , Figure 4 The outer side of the connecting sleeve 301 is fixedly connected to the first ring plate 311, and the second ring plate 302 is fixedly connected to the main shaft 2. The second ring plate 302 is provided with a limiting pin 307, and the first ring plate 311 is provided with a limiting hole. The limiting pin 307 is inserted into the limiting hole and forms a circumferential limiting structure.

[0039] Both the first and second ring plates are annular in structure and coaxial with the main shaft 2. The function of the limiting pin 307 is to constrain the main shaft 2 and the connecting sleeve 301 in the axial direction of the main shaft 2, thereby enabling the main shaft 2 to drive the connecting sleeve 301 to move.

[0040] Furthermore, the limiting hole has an arc-shaped hole structure, which includes an arc-shaped segment 313, a large hole segment 314, and a radial segment 312;

[0041] The arc segment 313 is provided with a large hole segment 314 and a radial segment 312 at both ends, respectively. The inner diameter of the large hole segment 314 is greater than the width of the arc segment 313 and the radial segment 312. The radial segment 312 is located in the radial direction of the first ring plate 311, and the arc segment 313 is located in the circumferential direction of the first ring plate 311.

[0042] One end of the limiting pin 307 passes through the limiting hole and is provided with a limiting part 3071. The width of the limiting part 3071 is greater than the diameter of the limiting pin 307. The limiting pin 307 is used to pass through the large hole section 314, and when the second ring plate 302 rotates, the limiting part 3071 abuts against the first ring plate 311.

[0043] When the limiting pin 307 is located in the radial section 312, the fixing protrusion 304 is offset from the notch. When the limiting pin 307 is located in the large hole section 314, the fixing protrusion 304 is located in the direction of the notch.

[0044] Specifically, the arc-shaped segment 313 is located in the middle, while the large-hole segment 314 and the radial segment 312 are located at both ends, forming an integral waist-shaped hole structure. In practical implementation, when the spindle 2 is inserted into the mounting cavity, the limiting pin 307 and the limiting part 3071 are inserted into the large-hole segment 314, and then the connecting sleeve 301 rotates until the limiting pin 307 is located in the radial segment 312. At this time, the fixing protrusion 304 is misaligned with the notch.

[0045] Furthermore, the second ring plate 302 is provided with an oblong hole and a sliding hole in the radial direction. One end of the oblong hole is connected to one end of the sliding hole, and the other end of the sliding hole is provided with an opening on the circumferential surface of the second ring plate 302. The limiting pin 307 passes through the oblong hole, and one end of the sliding rod 308 is fixedly connected to the side of the limiting pin 307. The other end of the sliding rod 308 slidably passes through the sliding hole. A spring 309 is sleeved on the sliding rod 308 to push the limiting pin 307 toward the radial segment 312.

[0046] Specifically, the end of the slide rod 308 furthest from the second ring plate 302 is fixedly connected to the baffle 310, and the spring 309 is located between the baffle 310 and the outer surface of the second ring plate 302. The two ends of the spring 309 are respectively fixedly connected to the baffle 310 and the second ring plate 302. When the limiting pin 307 is located within the arc-shaped segment 313, the spring 309 is in a stretched state. Therefore, when the limiting pin 307 is located within the radial segment 312, the spring 309 drives the limiting pin 307 to move towards the radial segment 312, forming... Figure 4 The position in the middle.

[0047] During the rotation of the main shaft 2 and the second ring plate 302, the spring 309 can also eliminate the influence of centrifugal force on the limiting pin 307, so that it is stably placed in the radial section 312, and the radial section 312 simultaneously generates circumferential constraint on the limiting pin 307, thereby driving the connecting sleeve 301 to move.

[0048] Therefore, in this invention, axial constraint is formed by the fixing protrusion 304 and the notch, while circumferential constraint is formed by the limiting pin 307 and the radial section 312. When disassembly is required, the sliding rod 308 needs to be pulled outward to remove the limiting pin 307 from the large hole section 314.

[0049] In addition, multiple limit pins 307 can be provided around the main shaft 2 circumferentially, and multiple corresponding limit holes can also be provided. Multiple fixing protrusions 304 and notches can be provided around the main shaft 2 circumferentially.

[0050] The present invention also relates to a stator, wherein the stator housing 4 has a wave-shaped structure.

[0051] Specifically, the outer wall of the stator housing 4 in the prior art is a uniform cylindrical structure, while its inner wall is a wavy structure, resulting in inconsistent wall thickness.

[0052] This invention designs the stator housing 4 as a wave-shaped structure with uniform wall thickness, resulting in greater reliability and longer service life; easier replacement and maintenance; and more uniform wall thickness ensures reliable rotor dynamic balance and stable pump operation. During manufacturing, steel parts are used, with hollow steel extruded using a special mold; the internal components are formed by die casting using a rubber mold.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, substitutions, or variations made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A screw pump, characterized in that, It includes a pump body housing (1), a stator housing (4), a main shaft (2), a quick-release rotor (5), and a connecting mechanism (3); The main shaft (2) is installed inside the pump body housing (1). One end of the main shaft (2) is connected to the drive part, and the other end is connected to the quick-mount rotor (5) through the connecting mechanism (3). The quick-mount rotor (5) is installed inside the stator housing (4). The connecting mechanism (3) is used to rotate to connect the main shaft (2) and the quick-release rotor (5). The connecting mechanism (3) includes a connecting sleeve (301), a limiting ring sleeve (303), and a fixing protrusion (304). The connecting sleeve (301) is provided with an open mounting cavity, one end of the main shaft (2) is inserted into the mounting cavity, the fixing protrusion (304) is fixedly connected to the outer side of the main shaft (2), and the limiting ring sleeve (303) is connected to the inner wall of the connecting sleeve (301). The limiting ring (303) is provided with a notch that matches the fixing protrusion (304). The fixing protrusion (304) passes through the notch and is offset from the notch. The fixing protrusion (304) abuts against the end face of the limiting ring (303), thereby forming an axial constraint. The outer side of the connecting sleeve (301) is fixedly connected to the first ring plate (311), and the second ring plate (302) is fixedly connected to the main shaft (2). The second ring plate (302) is provided with a limiting pin (307), and the first ring plate (311) is provided with a limiting hole. The limiting pin (307) is inserted into the limiting hole and forms a circumferential limiting structure. The limiting hole has an arc-shaped structure, which includes an arc-shaped section (313), a large hole section (314), and a radial section (312). The arc segment (313) is provided with a large hole segment (314) and a radial segment (312) at both ends, respectively. The inner diameter of the large hole segment (314) is greater than the width of the arc segment (313) and the radial segment (312). The radial segment (312) is located in the radial direction of the first ring plate (311), and the arc segment (313) is located in the circumferential direction of the first ring plate (311). One end of the limiting pin (307) passes through the limiting hole and is provided with a limiting part (3071). The width of the limiting part (3071) is greater than the diameter of the limiting pin (307). The limiting pin (307) is used to pass through the large hole section (314). When the second ring plate (302) rotates, the limiting part (3071) abuts against the first ring plate (311). When the limiting pin (307) is located in the radial section (312), the fixing protrusion (304) is offset from the notch. When the limiting pin (307) is located in the large hole section (314), the fixing protrusion (304) is located in the direction of the notch. The second ring plate (302) is provided with a waist-shaped hole and a sliding hole in the radial direction. One end of the waist-shaped hole is connected to one end of the sliding hole. The other end of the sliding hole is provided with an opening on the circumferential surface of the second ring plate (302). The limiting pin (307) passes through the waist-shaped hole. The side of the limiting pin (307) is fixedly connected to one end of the sliding rod (308). The other end of the sliding rod (308) can slide through the sliding hole. A spring (309) is sleeved on the sliding rod (308) to push the limiting pin (307) toward the radial segment (312).

2. A screw pump according to claim 1, characterized in that, The outer ring of the limiting ring sleeve (303) is fixedly connected to the fixing ring (305), and the fixing ring (305) is detachably connected to the mounting cavity.

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