A screw pump

Abstract

This invention specifically relates to screw pumps and belongs to the field of screw pumps. The screw pump includes a housing, a stator cavity, a rotor, a drive component, and a self-aligning component. The housing has an intake chamber and an exhaust chamber spaced apart, and the stator cavity connects the intake and exhaust chambers. The stator cavity is made of steel and is formed by extrusion molding. The rotor is rotatably connected to the housing and is at least partially housed in the stator cavity. The rotor is also made of steel, is hollow, and is formed by extrusion molding. The drive component includes a drive shaft for driving the rotor to rotate. The self-aligning component connects the rotor and the drive shaft and is used to adjust the concentricity of the rotor and the drive shaft, reducing the risk of malfunction due to excessive concentricity error between the rotor and the drive shaft.

Description

Technical Field

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

[0002] A screw pump, also known as a progressive displacement pump, consists of a stator and a rotor. Their helical interference fit forms a continuously sealed cavity, and the rotation of the rotor enables the transfer of the medium. It has advantages such as simple structure, uniform flow rate, low disturbance, and strong carrying capacity.

[0003] The inventors discovered that in existing screw pumps, the rotor is mostly driven by a motor. If there is an error in the concentricity of the rotor and the motor drive shaft, it will lead to errors in the fit between the rotor and the stator, resulting in increased wear on both the rotor and the stator and a reduced service life of the screw pump. Furthermore, errors in the concentricity of the rotor and the motor drive shaft may also cause abnormal vibrations during the operation of the screw pump. Summary of the Invention

[0004] The purpose of this invention is to provide a screw pump that has a self-aligning component, which can adjust the concentricity of the rotor and the drive shaft to ensure the normal operation of the screw pump.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this invention is as follows: a screw pump, comprising a housing, a stator cavity, a rotor, a drive component, and a self-aligning component. The housing has an intake chamber and an exhaust chamber spaced apart, the stator cavity connects the intake and exhaust chambers, the stator cavity is made of steel, and the stator cavity is formed by extrusion molding. The rotor is rotatably connected to the housing, and the rotor is at least partially housed within the stator cavity. The rotor is also made of steel, is hollow, and is formed by extrusion molding. The drive component includes a drive shaft for driving the rotor to rotate, and the self-aligning component connects the rotor and the drive shaft for adjusting the concentricity of the rotor and the drive shaft.

[0006] In some embodiments, a flexible pad is provided on the inner wall of the stator cavity.

[0007] In some embodiments, the flexible pad is rubber.

[0008] In some embodiments, the self-aligning component includes a connecting housing, a connecting gear, and a closing portion. The connecting housing is connected to the drive shaft and has a receiving cavity with an opening. The connecting gear is received in the receiving cavity, and its axis is parallel to the drive shaft. The connecting gear has an eccentrically positioned connecting portion for connecting to the rotor. The closing portion is detachably connected to the connecting housing and is used to close the receiving cavity. The closing portion has a limiting track, the normal of which is perpendicular to the axial direction of the connecting gear. The closing portion includes a first side facing the connecting gear and a second side facing away from the first side. The closing portion has two connecting holes connecting the first and second sides. The limiting track passes through the connecting holes so that it is partially positioned on the first side and partially on the second side. The portion of the limiting track on the first side has limiting teeth for meshing with the connecting gear. The second side has a torsion portion for torsion the portion of the limiting track on the second side.

[0009] In some embodiments, the torsion part includes a torsion block with a through hole, a limiting track passing through the through hole, the torsion block being rotatably connected to the enclosure, and the rotation axis of the torsion block being perpendicular to the axial direction of the connecting gear.

[0010] In some embodiments, a locking component is also included for locking the torsion block.

[0011] In some embodiments, the inner wall of the connecting hole and the limiting track slide together.

[0012] In some embodiments, the limiting track includes a plurality of belt segments connected in sequence.

[0013] In some embodiments, the connecting shell and the closing part are respectively provided with mating parts, and the mating parts are provided with limit holes.

[0014] The present invention has the following beneficial effects:

[0015] 1. Traditional locking mechanisms for connecting gears often require the connecting gear to be in a specific position to achieve locking. For example, a pin may be installed on the connecting gear, and a pin hole may be provided in the receiving cavity. The pin is inserted into the pin hole to lock the connecting gear. This locking method requires the pin and pin hole to be aligned. If the connecting gear is in a position where the drive shaft and rotor are relatively concentric, but the pin and pin hole are misaligned, locking cannot be achieved, reducing the effectiveness of adjusting the concentricity of the drive shaft and rotor. In the embodiments of this application, when the connecting gear rotates to any position, the position of the limiting track can be adjusted so that the limiting teeth correspond to the position of the connecting gear, thereby locking the connecting gear. This ensures the effectiveness of adjusting the concentricity of the drive shaft and rotor and reduces the risk of abnormal operation of the screw pump due to excessive concentricity error between the rotor and drive shaft. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the screw pump structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the self-aligning component of the present invention;

[0018] Figure 3 This is a schematic diagram illustrating the fit between the rotor and the output cycle of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the actuating component of the present invention;

[0020] Figure 5 for Figure 3 Enlarged view of point A.

[0021] Reference numerals: 1-Housing, 2-Stator cavity, 3-Rotor, 4-Body, 5-Connecting sleeve, 6-Connecting shaft, 7-Drive shaft, 8-Self-aligning component, 9-Drive component, 10-Connecting shell, 11-Enclosure, 12-Connecting gear, 13-Limiting track, 14-Torsion block, 15-Limiting tooth, 16-Connecting part, 17-Receiving cavity, 18-Mating part, 19-Drive sleeve, 20-Bolt, 21-Fixing hole, 22-Threaded hole, 23-Cylindrical bladder, 24-Helical blade, 25-Actuating head, 26-Rotating shaft, 27-Abutting component, 28-Main arm, 29-Secondary arm, 30-Insertion hole, 31-Limiting hole, 32-Allowing part, 33-Reference surface. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention / utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention / utility model, 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.

[0023] In the description of this invention / utility model, 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 / utility model, and do not 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 / utility model.

[0024] like Figure 1The screw pump shown includes a housing 1, a stator cavity 2, a rotor 3, a drive component 9, and a self-aligning component 8. The housing 1 has a suction chamber and a discharge chamber spaced apart. The stator cavity 2 connects the suction chamber and the discharge chamber. The stator cavity 2 is made of steel and is formed by extrusion molding. The rotor 3 is rotatably connected to the housing 1 and is at least partially housed in the stator cavity 2. The rotor 3 is also made of steel and is hollow, formed by extrusion molding. The drive component 9 includes a drive shaft 7 for driving the rotor 3 to rotate. The self-aligning component 8 connects the rotor 3 and the drive shaft 7 and is used to adjust the concentricity of the rotor 3 and the drive shaft 7.

[0025] The stator cavity 2 connects the suction cavity and the discharge cavity. When the screw pump is working, the rotor 3 rotates in the stator cavity 2, allowing the medium to be drawn from the suction cavity into the discharge cavity. The screw pump in this embodiment can be a single screw pump, and the rotor 3 can be helical, with the stator cavity 2 and the rotor 3 having matching shapes.

[0026] The working principle of the rotor 3 and stator cavity 2 in cooperating to transport the medium is well known to those skilled in the art and will not be described in detail here.

[0027] The stator cavity 2 is formed by extrusion molding, which on the one hand allows the stator cavity 2 to form a more complex structure, and on the other hand makes the surface of the stator cavity 2 smooth.

[0028] The rotor 3 is formed by extrusion molding through a mold, which on the one hand allows the rotor 3 to form a more complex structure, and on the other hand makes the surface of the rotor 3 smooth.

[0029] The rotor 3 can be a hollow structure, which saves manufacturing materials and reduces the weight of the rotor 3.

[0030] The drive component 9 can be a motor, or a combination of a motor and a reducer. The drive shaft 7 can be the output shaft of the motor, or the output shaft of the reducer.

[0031] The self-aligning component 8 is used to adjust the concentricity of the rotor 3 and the drive shaft 7, reducing the risk of abnormal operation of the screw pump caused by excessive concentricity error between the rotor 3 and the drive shaft 7.

[0032] The rotor 3 and the drive shaft 7 can be directly connected via the self-aligning component 8, or the rotor 3 can be provided with a connecting shaft 6, which is connected to the drive shaft 7 via the self-aligning component 8, and the rotor 3 and the connecting shaft 6 are detachably connected.

[0033] In some embodiments, the inner wall of the stator cavity 2 is provided with a flexible pad.

[0034] The flexible padding layer increases the sealing effect between the rotor 3 and the stator cavity 2 on the one hand, and increases the heat dissipation effect of the stator cavity 2 on the other hand.

[0035] In some embodiments, the flexible pad is rubber.

[0036] The rubber material has good wear resistance and good elasticity. It can recover its original shape after being squeezed by rotor 3, which increases the service life of the flexible pad.

[0037] See Figure 2 In some embodiments, the self-aligning component 8 includes a connecting housing 10, a connecting gear 12, and a closing portion 11. The connecting housing 10 is connected to the drive shaft 7 and has a receiving cavity 17 with an opening. The connecting gear 12 is received in the receiving cavity 17, and the axis of the connecting gear 12 is parallel to the drive shaft 7. The connecting gear 12 is eccentrically provided with a connecting portion 16 for connecting the rotor 3. The sealing part 11 is detachably connected to the connecting shell 10 and is used to seal the receiving cavity 17. The sealing part 11 is provided with a limiting track 13. The normal of the track surface of the limiting track 13 is perpendicular to the axial direction of the connecting gear 12. The sealing part 11 includes a first side facing the connecting gear 12 and a second side facing away from the first side. The sealing part 11 is provided with two connecting holes that connect the first side and the second side. The limiting track 13 passes through the connecting holes so that the limiting track 13 is partially disposed on the first side and partially disposed on the second side. The portion of the limiting track 13 located on the first side is provided with limiting teeth 15, which are used to mesh with the connecting gear 12. The second side is provided with a torsion part, which is used to torsion the portion of the limiting track 13 located on the second side.

[0038] The connecting gear 12 is housed in the receiving cavity 17, allowing the connecting gear 12 to rotate within the receiving cavity 17. Since the connecting part 16 is eccentrically provided on the connecting gear 12, the axial position of the drive shaft 7 and the rotor 3 can be adjusted after the connecting gear 12 rotates, thereby achieving the purpose of adjusting the concentricity of the rotor 3 and the drive shaft 7.

[0039] The opening of the receiving cavity 17 is used to allow the connecting gear 12 to be taken out of and placed in the receiving cavity 17.

[0040] The sealing part 11 seals the receiving cavity 17, preventing the connecting gear 12 from dislodging from the receiving cavity 17. It also allows the limiting teeth 15 of the limiting track 13 to engage between the teeth of the connecting gear 12, enabling the limiting track 13 to control the rotation of the connecting gear 12.

[0041] The connecting gear 12 may be provided only in the receiving cavity 17, or the connecting gear 12 may be rotatably connected to the inner wall of the receiving cavity 17.

[0042] The limiting track 13 passes through the connecting hole, allowing the limiting track 13 to rotate relative to the closed part 11, thereby allowing the position of the limiting tooth 15 on the first side to change.

[0043] The torsion section is used to torsion the limiting track 13, preventing the portion of the limiting track 13 located on the second side from entering the connecting hole, thereby fixing the position of the limiting tooth 15. At this time, the limiting track 13 can lock the connecting gear 12. Conversely, if the limiting track 13 is twisted in the opposite direction, its surface will return to an untwisted state, allowing the limiting track 13 to enter the connecting hole. At this time, the locking effect of the limiting track 13 on the connecting gear 12 is released.

[0044] When it is necessary to adjust the concentricity of rotor 3 and drive shaft 7, connecting gear 12 needs to rotate. After the connecting gear 12 rotates, the limiting tooth 15 may need to be adjusted to fully mesh with the connecting gear 12. At this time, the limiting track 13 is in an untwisted state, so that the limiting track 13 can rotate to allow the limiting tooth 15 and the connecting gear 12 to mesh. Conversely, after the adjustment is completed, it is necessary to lock the connecting gear 12. At this time, the limiting track 13 is twisted by the torsion part, so that the limiting track 13 cannot move along the connecting hole, and thus the position of the limiting tooth 15 is limited, and the connecting gear 12 is locked.

[0045] Traditional locking mechanisms for the connecting gear 12 often require the connecting gear 12 to be in a specific position to achieve locking. For example, the connecting gear 12 may have a pin, and the receiving cavity 17 may have a pin hole. The pin is inserted into the pin hole to lock the connecting gear 12. This locking method requires the pin and pin hole to be aligned. If the drive shaft 7 and rotor 3 are in a position where the connecting gear 12 is misaligned with the pin and pin hole, locking cannot be achieved, reducing the effectiveness of adjusting the concentricity of the drive shaft 7 and rotor 3. In this embodiment, when the connecting gear 12 rotates to any position, the position of the limiting track 13 can be adjusted so that the limiting tooth 15 corresponds to the position of the connecting gear 12, thereby locking the connecting gear 12 and ensuring the effectiveness of adjusting the concentricity of the drive shaft 7 and rotor 3.

[0046] See Figure 2 In some embodiments, the torsion part includes a torsion block 14, which is provided with a through hole. The limiting track 13 passes through the through hole. The torsion block 14 is rotatably connected to the closed part 11. The rotation axis 26 of the torsion block 14 is perpendicular to the axial direction of the connecting gear 12.

[0047] The limiting track 13 is inserted through the perforation, so that when the torsion block 14 rotates, it can torsion the limiting track 13.

[0048] In some embodiments, a locking component is also included for locking the torsion block 14.

[0049] The locking component may include a pin disposed on the torsion block 14. The closing part 11 may be provided with a pin hole. The pin is inserted into the pin hole to achieve the purpose of locking the torsion block 14. Conversely, the pin is pulled out from the pin hole so that the torsion block 14 can rotate.

[0050] In this embodiment, two pin holes can be provided. One is to lock the torsion block 14 when the limiting track 13 is in a torsion state, and the other is to lock the torsion block 14 when the limiting track 13 is in an untwisted state.

[0051] In some embodiments, the inner wall of the connecting hole and the limiting track 13 slide together.

[0052] The connecting hole and the limiting track 13 slide together, so that the size of the connecting hole can correspond to the cross-sectional size of the limiting track 13. On the one hand, this improves the rotation accuracy of the limiting track 13, and on the other hand, it prevents the limiting track 13 from passing through the connecting hole after it is twisted.

[0053] In some embodiments, the limiting track 13 includes a plurality of belt segments connected in sequence.

[0054] The limiting track 13 includes multiple links, which cause misalignment between two adjacent links after the limiting track 13 is twisted. This allows the link outside the connecting hole to abut against the outer edge of the connecting hole, preventing it from entering the connecting hole.

[0055] In some embodiments, the connecting shell 10 and the closing part 11 are respectively provided with a mating part 18, and the mating part 18 is provided with a limiting hole 31.

[0056] The mating part 18 is used to allow the connecting shell 10 and the closing part 11 to be detachably connected. For example, when the mating part 18 of the connecting shell 10 and the closing part 11 is mated, the limiting holes 31 of the two are coaxial. After the bolt 20 passes through the limiting holes 31 of the two and is connected with the nut, the connecting shell 10 and the closing part 11 can be connected.

[0057] See Figure 1 and Figure 3This invention also provides a rotor 3, including a body 4 and a quick-connect assembly. The body 4 is configured to be extruded, and a connecting sleeve 5 is provided at one end of the body 4. In an embodiment where the rotor 3 is provided with a connecting shaft 6, the connecting sleeve 5 is sleeved on the connecting shaft 6. The quick-connect assembly includes a drive sleeve 19, a stop member 27, and a toggle member. The drive sleeve 19 is movably connected to the connecting shaft 6 along the axial direction of the connecting shaft 6. The drive sleeve 19 is located on the side of the connecting sleeve 5 away from the body 4. The drive sleeve 19 is rotatably provided with a rotating shaft 26. The rotation axis 26 of the rotating shaft 26 is perpendicular to the axial direction of the connecting shaft 6. Divided by a reference plane 33, the rotating shaft 26 includes a third side away from the body 4 and a fourth side close to the body 4. The axis of the rotating shaft 26 is located on the reference plane 33. The stop member 27 includes a bent first side. The first arm is connected to the rotating shaft 26, and the second arm is used to abut against the drive sleeve 19 when the abutting component 27 is located on the third side. The drive sleeve 19 is provided with a relief part 32 on the side near the fourth side, which is used to accommodate the abutting component 27 when it is located on the fourth side. The connecting sleeve 5 is provided with a mating part 18, which is located on the third side and is used to abut against the second arm when the abutting component 27 is located on the third side. The actuating component is connected to the drive sleeve 19 and is used to actuate the rotating shaft 26.

[0058] Body 4 is used to cooperate with stator cavity 2.

[0059] The quick-connect component is used to enable the body 4 to be quickly connected to the connecting shaft 6.

[0060] The drive sleeve 19 is used on the one hand to drive the actuating part to move along the axial direction of the connecting shaft 6, and on the other hand to abut against the connecting sleeve 5 to limit the connection sleeve 5.

[0061] The limiting structure of the drive sleeve 19 can be rotated in the existing structure. For example, the drive sleeve 19 can be limited to the connecting shaft 6 by setting a pin in the drive sleeve 19 and a pin hole in the connecting shaft 6, with the pin inserted into the pin hole.

[0062] The abutment component 27 includes a first arm and a second arm. Due to the bending arrangement of the first and second arms, the rotating shaft 26 rotates, so that when the abutment component 27 is located on the third side, the second arm can abut against the connecting shaft 6. The first arm, the second arm, and the connecting shaft 6 can form a triangular structure. The mating part 18 is located on the third side and abuts against the second arm, so that the second arm can limit the mating part 18. Therefore, the drive sleeve 19 abuts against the connecting sleeve 5, and the second arm abuts against the connecting part 16, so that the position of the connecting sleeve 5 in the axial direction of the connecting shaft 6 can be limited.

[0063] The triangular structure formed by the first arm, the second arm, and the connecting shaft 6 makes the abutment 27 located on the third side. When the mating part 18 abuts against the second arm, the mating part 18 cannot push the abutment 27 to rotate to the fourth side.

[0064] When disassembling the connecting sleeve 5, the drive sleeve 19 can be moved first, so that the drive sleeve 19 moves away from the connecting sleeve 5, so that the connecting sleeve 5 has an axial movement gap in the connecting shaft 6. Moving the connecting sleeve 5 makes a gap form between the mating part 18 and the second arm. At this time, the drive sleeve 19 is moved further, so that the actuating part can actuate the abutting part 27 to rotate.

[0065] To further reduce the risk that the mating part 18 will push the abutting part 27 from the third side to the fourth side, when the second arm abuts against the connecting shaft 6, the included angle between the axis of the second arm and the axis of the connecting shaft 6 is less than °, the included angle between the axis of the first arm and the output circle is less than °, and the included angle between the first arm and the second arm is ≥ °.

[0066] The clearance portion 32 can be formed by recessing the connecting shaft 6 portion towards the axis, or the clearance portion 32 can be formed by removing the connecting shaft 6 portion. Under the action of the clearance portion 32, the abutment member 27 can include a limiting state and a retracted state. When the abutment member 27 is located on the third side, the abutment member 27 can be in the limiting state, at which time the mating part 18 abuts against the second arm. When the abutment member 27 is located on the fourth side, the abutment member 27 is screwed into the clearance portion 32, at which time the mating part 18 can pass through the abutment member 27, that is, the connecting sleeve 5 can be removed from the connecting shaft 6.

[0067] The drive sleeve 19 moves the actuating component, which in turn moves the rotating shaft 26 and the abutment component 27 to the third side, thus limiting the position of the connecting sleeve 5. Simultaneously, the drive sleeve 19 abuts against the connecting sleeve 5, restricting its axial position on the connecting shaft 6. Conversely, moving the drive sleeve 19 in the opposite direction causes the actuating component to reverse the rotation of the rotating shaft 26, and the abutment component 27 to rotate into the clearance part 32. At this point, the connecting sleeve 5 can be removed from the connecting shaft 6. Compared to the traditional bolt-connected method, the quick-connect assembly allows for rapid disassembly and assembly of the rotor 3, improving the efficiency of screw pump maintenance.

[0068] The inner wall of the connecting sleeve 5 can be provided with a keyway, and the connecting shaft 6 can be provided with a key. When the connecting sleeve 5 is fitted onto the connecting shaft 6, the key is accommodated in the keyway, which reduces the risk of relative rotation between the connecting sleeve 5 and the connecting shaft 6.

[0069] See Figure 3 In some embodiments, the mating part 18 abuts against the side of the second arm facing away from the connecting shaft 6.

[0070] The mating part 18 abuts against the side of the second arm facing away from the connecting shaft 6, reducing the risk that the abutting part 27 will rotate from the third side to the fourth side when the screw pump is working.

[0071] See Figure 3 and Figure 4In some embodiments, the actuating component includes a cylindrical capsule 23 and an actuating head 25. The axis of the cylindrical capsule 23 is parallel to the axis of the connecting shaft 6. The cylindrical capsule 23 is rotatably connected to the drive sleeve 19. Along the axial direction of the cylindrical capsule 23, a spiral blade 24 is provided on the outer periphery of the cylindrical capsule 23. The drive sleeve 19 is provided with a pressing part that abuts against the blade surface of the spiral blade 24 away from the drive sleeve 19. The actuating head 25 is connected to the cylindrical capsule 23 and is used to actuate the rotating shaft 26.

[0072] The cylindrical capsule 23 has an inflation / deflation channel, through which gas can be inflated or deflated.

[0073] By inflating the cylindrical bladder 23, the cylindrical bladder 23 can drive the actuating head 25 to move, thereby actuating the connecting shaft 6 to rotate.

[0074] The cylindrical bladder 23 can play a protective role. That is, if the abutment part 27 cannot rotate, the cylindrical bladder 23 can deform when the moving drive sleeve 19 moves the actuating part, reducing the risk of damage to the abutment part 27 or the actuating part.

[0075] The spiral blade 24 can be made of stainless steel.

[0076] The spiral blade 24 can provide axial support for the cylindrical capsule 23. On the other hand, when the cylindrical capsule 23 is rotated, the pressing part can compress the spiral blade 24, so that the axial length of the cylindrical capsule 23 can be adjusted.

[0077] See Figure 5 In some embodiments, the second arm includes a main arm 28 and a secondary arm 29. The main arm 28 is connected to the first arm and is provided with a socket 30. The secondary arm 29 is inserted into the socket 30. The secondary arm 29 is used to abut against the drive sleeve 19 when the abutment component 27 is located on the third side. The bottom wall of the socket 30 near the rotating shaft 26 is stepped. The bottom wall includes a transition surface connecting the stepped surface. The transition surface faces the opening of the socket 30. The transition surface is provided with a limiting hole 31. The secondary arm 29 is selectively inserted into the limiting hole 31.

[0078] The secondary arm 29 is inserted into the socket 30, allowing the secondary arm 29 to move relative to the main arm 28 to adjust the length of the second arm.

[0079] Because the bottom wall of the insertion hole 30 is stepped, the auxiliary arm 29 can mate with different stepped transition surfaces. That is, when the auxiliary arm 29 abuts against the connecting shaft 6, the auxiliary arm 29 can be selectively inserted into the limiting hole 31 of the transition surface, thereby limiting the relative position between the main arm 28 and the auxiliary arm 29. By adjusting the length of the second arm, the abutting part 27 can adapt to connecting sleeves 5 with different axial lengths, and the abutting part 27 can be positioned appropriately, making the mating part 18 and the second arm fit more tightly, thus improving the positioning effect of the connecting sleeve 5.

[0080] See Figure 3 In some embodiments, the connecting shaft 6 is provided with a support portion, which is used to abut against the second arm when the second arm abuts against the connecting shaft 6.

[0081] The support abuts against the second arm, which limits the rotation angle of the abutting part 27 when it is located on the third side, improving the fitting accuracy of the mating part 18 and the second arm. At the same time, the support and the mating part 18 can abut against different sides of the second arm respectively, reducing the risk of deformation of the second arm under the action of the mating part 18.

[0082] In some embodiments, the support portion is movably connected to the connecting shaft 6 along the axial direction of the connecting shaft 6.

[0083] The support is movably connected to the connecting shaft 6, so that the position of the support is adjustable, and thus the rotation angle of the abutment component 27 is adjustable.

[0084] The mating structure between the support and the connecting shaft 6 can be selected from existing structures. For example, the output circumference can be equipped with a slide rail, and the support can be slidably connected to the slide rail.

[0085] See Figure 3 and Figure 5 In some embodiments, the rotating shaft 26 is an incomplete columnar structure with open ends and notches on its peripheral walls, and the connecting shaft 6 is provided with shaft holes, into which the rotating shaft 26 is accommodated.

[0086] The pivot 26 can be formed by bending a metal plate.

[0087] The circumferential wall of the rotating shaft 26 has a notch. On the one hand, by closing the notch, the radius of the rotating shaft 26 can be reduced, making it easier to remove the rotating shaft 26 from the shaft hole. On the other hand, by pre-separating the notch, the circumferential wall surface of the rotating shaft 26 and the inner wall surface of the shaft hole can fit more tightly after the rotating shaft 26 is inserted into the shaft hole, thereby improving the fitting accuracy between the rotating shaft 26 and the shaft hole.

[0088] In some embodiments, along the axial direction of the connecting shaft 6, the connecting shaft 6 is provided with a plurality of threaded holes 22 at intervals, the driving sleeve 19 is provided with a fixing hole 21, the driving sleeve 19 is provided with a bolt 20, the bolt 20 passes through the fixing hole 21, and is selectively threaded to the threaded hole 22.

[0089] The bolt 20 and the fixing hole 21 are engaged to fix the drive sleeve 19 in the axial position of the connecting shaft 6. By engaging the bolt 20 with different threaded holes 22, the position of the drive sleeve 19 relative to the connecting shaft 6 can be adjusted.

[0090] The above embodiments are merely preferred embodiments of the present invention / utility model and are not intended to limit the scope of the present invention / utility model. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present invention / utility model without departing from the spirit of the present invention / utility model shall fall within the protection scope defined by the claims of the present invention / utility model.

Claims

1. A screw pump, characterized in that, include: The housing (1) is provided with an intake chamber and an exhaust chamber at intervals; The stator cavity (2) connects the suction cavity and the discharge cavity. The stator cavity (2) is made of steel and is formed by extrusion molding. The rotor (3) is rotatably connected to the housing (1), and the rotor (3) is at least partially housed in the stator cavity (2). The rotor (3) is made of steel and is hollow, formed by extrusion molding. The drive component (9) includes a drive shaft (7) for driving the rotor (3) to rotate; A self-aligning component (8) connects the rotor (3) and the drive shaft (7) and is used to adjust the concentricity of the rotor (3) and the drive shaft (7). The self-aligning component (8) includes: A connecting shell (10) is connected to the drive shaft (7). The connecting shell (10) is provided with a receiving cavity (17), and the receiving cavity (17) is provided with an opening. A connecting gear (12) is housed in the receiving cavity (17). The axis of the connecting gear (12) is parallel to the drive shaft (7). The connecting gear (12) is eccentrically provided with a connecting part (16), which is used for connecting the rotor (3). A closing part (11) is detachably connected to the connecting shell (10) for closing the receiving cavity (17). The closing part (11) is provided with a limiting track (13). The normal of the track surface of the limiting track (13) is perpendicular to the axial direction of the connecting gear (12). The closing part (11) includes a first side facing the connecting gear (12) and a second side away from the first side. The closing part (11) is provided with two connecting holes connecting the first side and the second side. The limiting track (13) passes through the connecting holes so that the limiting track (13) is partially located on the first side and partially located on the second side. The portion of the limiting track (13) located on the first side is provided with limiting teeth (15). The limiting teeth (15) are used to mesh with the connecting gear (12). The second side is provided with a torsion part, which is used to torsion the portion of the limiting track (13) located on the second side.

2. The screw pump according to claim 1, characterized in that, The inner wall of the stator cavity (2) is provided with a flexible pad.

3. The screw pump according to claim 2, characterized in that, The flexible pad is made of rubber.

4. The screw pump according to claim 1, characterized in that, The torsion part includes a torsion block (14), the torsion block (14) is provided with a through hole, the limiting track (13) passes through the through hole, the torsion block (14) is rotatably connected to the closed part (11), and the rotation axis (26) of the torsion block (14) is perpendicular to the axial direction of the connecting gear (12).

5. The screw pump according to claim 4, characterized in that, It also includes a locking component for locking the torsion block (14).

6. The screw pump according to claim 1, characterized in that, The inner wall of the connecting hole and the limiting track (13) slide together.

7. The screw pump according to claim 1, characterized in that, The limiting track (13) includes multiple belt segments connected in sequence.

8. The screw pump according to claim 1, characterized in that, The connecting shell (10) and the closing part (11) are respectively provided with a mating part (18), and the mating part (18) is provided with a limiting hole (31).

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