Screw pump shaft connecting structure

Abstract

The utility model discloses a screw pump shaft connecting structure, the screw pump shaft connecting structure comprises a pump body, a pump shaft and a driving motor for driving the pump shaft to rotate, the pump shaft comprises a connecting shaft and a screw shaft, the connecting shaft is connected with a motor shaft of the driving motor through a first connecting piece, and the screw shaft is telescopically fixed on the connecting shaft through a second connecting piece. The concentricity between the screw shaft and the connecting shaft is ensured through a sliding fit structure, and the sealing cover is designed to prevent materials from entering a screw shaft channel. The structure meets the requirements of pump shafts with different lengths, the manufacturing process is simplified, the production cost is reduced, the universality and the working stability of equipment are improved, and the screw pump is convenient to maintain, disassemble and assemble and suitable for being applied to screw pumps under various working conditions.

Description

Technical Field

[0001] The utility model relates to the field of pump mechanical equipment, in particular to a screw pump shaft connection structure. Background Art

[0002] Screw pumps, a typical rotor-type positive displacement pump, are widely used in a variety of industries, including the petroleum, chemical, food, and pharmaceutical industries. Through the rotation of the screw and the meshing of the bushing, screw pumps create volume changes within the suction and discharge chambers, enabling continuous liquid delivery. Compared to traditional centrifugal and reciprocating pumps, screw pumps offer advantages such as stable flow, minimal pressure fluctuations, strong self-priming capabilities, and the ability to handle high-viscosity or particulate media. Consequently, they are widely used.

[0003] However, existing screw pumps have several drawbacks. This is particularly true regarding the pump shaft connection, which typically requires designing shafts of varying lengths based on the application scenario to accommodate varying delivery distances. A direct fixed connection between the screw shaft and the motor is typically employed, requiring a screw shaft of a corresponding length for each pump's delivery distance. This design complicates manufacturing, as each pump shaft length must be individually designed and manufactured, even requiring different molds for each model. This not only increases production costs but also reduces the versatility and adjustability of the equipment.

[0004] Therefore, it is urgent to design a screw pump shaft connection structure to meet actual usage requirements. Utility Model Content

[0005] The purpose of the utility model is to provide a screw pump shaft connection structure, which can realize flexible connection between the pump shaft and the motor shaft, simplify the design and production of pump shafts of different lengths, improve the versatility and adjustability of the pump shaft connection, reduce production costs, and facilitate maintenance and disassembly.

[0006] The technical solution adopted by the present invention to solve the above problems is: a screw pump shaft connection structure, including a pump body, a pump shaft and a drive motor for driving the pump shaft to rotate, the pump shaft includes a connecting shaft and a screw shaft, the connecting shaft is connected to the motor shaft of the drive motor through a first connecting member, and the screw shaft is telescopically fixed to the connecting shaft through a second connecting member.

[0007] Preferably, the screw shaft is provided with a channel slidably matched with the connecting shaft, a plurality of guide bars are circumferentially provided on the inner wall of the channel, and a guide groove slidably matched with the convex bar is provided on the outer circumference of the connecting shaft.

[0008] Preferably, the first connecting member includes a first sleeve sleeved on the motor shaft and a second sleeve sleeved on the connecting shaft, and the first sleeve and the second sleeve are both provided with through holes, and pins are passed through the through holes to be fixed to the motor shaft and the connecting shaft respectively.

[0009] Preferably, the first connecting member is composed of two sets of half sets interlaced and embedded with each other.

[0010] Preferably, the second connecting member includes a third sleeve sleeved on the connecting shaft and a fourth sleeve sleeved on the screw shaft, the third sleeve is circumferentially threadedly connected with a fixing bolt, and the fourth sleeve is threadedly connected and adapted to the screw shaft.

[0011] Preferably, the third sleeve is provided with a groove in the circumferential direction, and the groove is provided with two groups of threaded holes adapted to be threadedly connected with the fixing bolts.

[0012] Preferably, the groove is adapted to be equipped with a mounting plate, the mounting plate is provided with a countersunk hole, and the nut of the fixing bolt is arranged in the countersunk hole.

[0013] Preferably, the groove is rectangular, with two groups of positioning columns on its diagonals, and the mounting plate is provided with positioning grooves adapted thereto.

[0014] Preferably, the end of the screw shaft away from the second connecting member is threadedly connected to a sealing cover.

[0015] Compared with the prior art, the present invention has the following advantages and effects:

[0016] The present invention effectively adapts to pump bodies of varying lengths by employing a retractable structural design between the screw shaft and the connecting shaft, avoiding the need for separate design and manufacture of screw shafts of varying lengths. This simplifies the production process and reduces manufacturing costs. Furthermore, the screw shaft utilizes a sliding fit structure between the guide bars and the guide grooves to ensure concentricity between the screw shaft and the connecting shaft, preventing jamming during operation and improving transmission stability and efficiency. Furthermore, the structural design of the first and second connecting members not only enhances overall torsional rigidity and strength but also simplifies the assembly and disassembly process for easier maintenance. The sealing cover design effectively prevents material from entering the screw shaft channel, reducing the effects of scaling and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a screw pump shaft connection structure according to an embodiment of the present utility model.

[0018] Figure 2 It is a schematic diagram of the sliding sleeve connection between the connecting shaft and the screw shaft in an embodiment of the utility model.

[0019] Figure 3 It is a structural diagram of the first connecting member of an embodiment of the present utility model.

[0020] Figure 4 It is a connection diagram of the second connecting member of an embodiment of the present utility model.

[0021] Figure 5 It is a structural schematic diagram of the second connecting member of an embodiment of the present utility model.

[0022] Figure 6 It is a structural schematic diagram of the sealing cover at the end of the screw shaft in an embodiment of the present utility model.

[0023] Figure numbers: pump body 11, pump shaft 12, drive motor 13, connecting shaft 14, screw shaft 15, first connecting part 16, motor shaft 17, second connecting part 18, bushing 21, feed chamber 22, feed port 23, discharge port 24, channel 31, guide bar 32, guide groove 33, first shaft sleeve 41, second shaft sleeve 42, through hole 43, half sleeve 44, pin 45, mating surface 46, third shaft sleeve 51, fourth shaft sleeve 52, fixing bolt 53, groove 54, threaded hole 55, mounting plate 56, countersunk hole 57, positioning groove 57, positioning column 58, positioning groove 59, sealing cover 61, external thread 62, internal thread 63. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0025] Example: See Figure 1 and Figure 2 In this embodiment, a screw pump shaft 12 connection structure is involved, which is specifically used for the transmission device of the screw pump, and specifically includes: a pump body 11, a pump shaft 12 and a drive motor 13 that drives the pump shaft 12 to rotate. The pump shaft 12 includes a connecting shaft 14 and a screw shaft 15. The connecting shaft 14 is axially connected to the motor shaft 17 of the drive motor 13 through a first connecting member 16, and the screw shaft 15 is telescopically fixed to the connecting shaft 14 through a second connecting member 18.

[0026] Specifically, in this embodiment, the pump body 11 includes a bushing 21 that meshes with the screw shaft 15. A feed chamber 22 is provided at one end of the bushing 21, and the connecting shaft 14 is rotatably provided in the feed chamber 22. A feed port 23 is provided on the feed chamber 22 for the transportation and entry of materials, and a discharge port 24 is provided at the other end of the bushing 21 for the output of the transported liquid or material. The drive motor 13 is provided at one end of the feed chamber 22, and power transmission is achieved through the motor shaft 17 and the first connecting member 16 of the connecting shaft 14. In order to meet different material delivery requirements, such as different delivery distances, viscosity or flow rate differences of the conveying medium, bushings 21 or feed bins of different lengths need to be provided in actual applications to adapt to various working conditions, and therefore different pump bodies 11 need to be produced. Traditional screw pumps require the purchase and installation of a new pump shaft 12 of the corresponding length after its pump shaft 12 is damaged. A single pump shaft 12 cannot accommodate pump bodies 11 of varying lengths. The screw shaft 15 of the present invention is retractably fixed to the connecting shaft 14 via a second connector 18, allowing for adjustable length adjustment of the screw pump shaft 12 to accommodate pump bodies 11 of varying lengths. Compared to existing technologies, this structure not only improves the versatility of the screw pump shaft 12 but also reduces the number of molds required to manufacture pump shafts 12 of varying lengths, thereby reducing costs.

[0027] See also Figure 2 In this embodiment, the screw shaft 15 defines a channel 31 that slidably engages the connecting shaft 14. Several guide bars 32 are circumferentially arranged along the inner wall of the channel 31, and guide grooves 33 are circumferentially arranged along the outer circumference of the connecting shaft 14, slidably engaging the protruding bars. Both the guide bars 32 and the channel 31 are axially arranged along the pump shaft 12, allowing the screw shaft 15 to slide relative to the connecting shaft 14 without rotating, maintaining their axial relative position. This design not only transmits torque but also ensures the concentricity of the screw shaft 15 and the connecting shaft 14, preventing deviation and jamming during operation, thereby ensuring smooth transmission.

[0028] The first connecting member 16 includes a first sleeve 41 sleeved on the motor shaft 17 and a second sleeve 42 sleeved on the connecting shaft 14. Both the first sleeve 41 and the second sleeve 42 have through-holes 43 formed therein. Pins 45 are inserted through the through-holes 43 and are fixedly connected to the motor shaft 17 and the connecting shaft 14, respectively. The insertion and fixation of the pins 45 achieve a stable connection between the motor shaft 17 and the connecting shaft 14, ensuring that the rotational motion of the drive motor 13 can be effectively transmitted to the connecting shaft 14, thereby driving the screw shaft 15 to operate.

[0029] See also Figure 3The first connecting member 16 is composed of two sets of interlaced half-sleeves 44. The two sets of half-sleeves 44 have the same structure, each including a first sleeve (half of the first sleeve 41) and a second sleeve (half of the second sleeve 42). The mating surfaces 46 between the first and second sleeves are perpendicular, and the through-holes 43 are opened perpendicular to the mating surfaces 46. Torque is transmitted through the contact between the mating surfaces 46. In addition, after the two sets of half-sleeves 44 are connected to the connecting shaft 14 and the motor shaft 17 via two pins 45, the two pins 45 are vertically distributed in space, which can improve the overall torsional rigidity and strength of the first connecting member 16 and ensure that the transmission torque between the motor shaft 17 and the connecting shaft 14 can be more evenly transmitted.

[0030] See also Figure 4 and Figure 5 The second connecting member 18 includes a third sleeve 51 sleeved on the connecting shaft 14 and a fourth sleeve 52 sleeved on the screw shaft 15. The third sleeve 51 is circumferentially threaded with a fixing bolt 53, and the fourth sleeve 52 is threadedly connected to the screw shaft 15. Specifically, when installing the fixing bolt 53, the fixing bolt 53 faces the slide groove of the connecting shaft 14. After being tightened, the fixing bolt 53 contacts and presses against the bottom surface of the slide groove, thereby securing the second connecting member 18 to the connecting shaft 14.

[0031] Specifically, the third sleeve 51 is circumferentially provided with a groove 54, which defines two sets of threaded holes 55 for threading with the fixing bolts 53. During installation, the groove 54 is adapted to accommodate a mounting plate 56, which is provided with countersunk holes 57. This allows the nuts of the fixing bolts 53 to be seated within the countersunk holes 57, preventing the nuts from being exposed and, to a certain extent, reducing the possibility of loosening or wear caused by impact on the nuts during material conveying.

[0032] The recess 54 is rectangular, with two sets of locating posts 58 on opposite corners. The mounting plate 56 is provided with locating slots 57 that match these. When the mounting plate 56 is mated with the third sleeve 51, the locating slots 57 on the mounting plate 56 are aligned with the locating posts 58 on the recess 54. This aligns the countersunk holes 57 on the mounting plate 56 with the centers of the threaded holes 55 in the recess 54, facilitating the installation of the fixing bolts 53.

[0033] See also Figure 5 The end of the screw shaft 15 away from the second connecting member 18 is threadedly connected to a sealing cover 61, and the sealing cover 61 is provided with an external thread 62. The inner wall of the channel 31 is provided with an internal thread 63 that cooperates with it. The channel 31 in the screw shaft 15 is sealed by the design of the sealing cover 61, which can prevent the material from pouring into the channel 31 of the screw shaft 15 from the discharge port 24 of the pump body 11 during material transportation, causing scaling in the channel 31 and affecting the matching connection between the screw shaft 15 and the connecting shaft 14.

[0034] The above contents described in this specification are merely examples of the present invention. Those skilled in the art of the present invention may make various modifications, additions, or substitute similar methods to the specific embodiments described, as long as they do not deviate from the contents of this specification or exceed the scope defined by the claims, and shall fall within the scope of protection of the present invention.

Claims

1. A screw pump shaft connection structure, comprising a pump body, a pump shaft and a drive motor for driving the pump shaft to rotate, characterized in that: The pump shaft includes a connecting shaft and a screw shaft. The connecting shaft is connected to the motor shaft of the driving motor through a first connecting member, and the screw shaft is telescopically fixed to the connecting shaft through a second connecting member.

2. A screw pump shaft connection structure according to claim 1, characterized in that: The screw shaft is provided with a channel which is slidably matched with the connecting shaft. The inner wall of the channel is circumferentially provided with a plurality of guide bars, and the outer circumference of the connecting shaft is provided with a guide groove which is slidably matched with the convex bar.

3. The screw pump shaft connection structure according to claim 1, characterized in that: The first connecting member includes a first sleeve sleeved on the motor shaft and a second sleeve sleeved on the connecting shaft. The first sleeve and the second sleeve are both provided with through holes, and pins are passed through the through holes to be fixed to the motor shaft and the connecting shaft respectively.

4. A screw pump shaft connection structure according to claim 3, characterized in that: The first connecting piece is composed of two sets of half sleeves that are staggered and embedded with each other.

5. The screw pump shaft connection structure according to claim 1, characterized in that: The second connecting member includes a third sleeve sleeved on the connecting shaft and a fourth sleeve sleeved on the screw shaft. The third sleeve is circumferentially threadedly connected with a fixing bolt, and the fourth sleeve is threadedly connected and adapted to the screw shaft.

6. The screw pump shaft connection structure according to claim 5, characterized in that: The third sleeve is provided with a groove in the circumferential direction, and two groups of threaded holes adapted to be threadedly connected with the fixing bolts are provided in the groove.

7. The screw pump shaft connection structure according to claim 6, characterized in that: The groove is adapted to be equipped with a mounting plate, the mounting plate is provided with a countersunk hole, and the nut of the fixing bolt is arranged in the countersunk hole.

8. The screw pump shaft connection structure according to claim 7, characterized in that: The groove is rectangular, with two groups of positioning columns on its diagonal corners, and the mounting plate is provided with positioning grooves adapted thereto.

9. The screw pump shaft connection structure according to claim 1, characterized in that: The end of the screw shaft away from the second connecting piece is threadedly connected with a sealing cover.

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