A waterproof screw pump direct drive permanent magnet motor

Abstract

The invention discloses a waterproof screw pump direct-drive permanent magnet motor, which relates to the technical field of permanent magnet motors. The overall structure is based on a downhole screw pump, and a coupling structure between the motor and the screw pump is proposed, which is mainly used to isolate rainwater and prevent rainwater from entering the thrust bearing to pollute the lubricating oil therein. Specifically, a sealing ring is used as a sealing structure as a basis, and a fixed cap sleeve and a movable cap sleeve that cooperate with each other are added. The fixed cap sleeve rotates synchronously in the process of normal rotation of the transmission shaft. When the fan blade group is matched with the technical structure, the fixed cap sleeve always generates a guiding airflow in the downward direction, and the guiding airflow corresponds to the through-flow channel. The movable cap sleeve can be directional and slightly moved in the vertical direction, so that the fluctuating flow bin at the upper or lower position is in an open state, which is specifically used for directional drainage of rainwater that has penetrated into the lower sleeve, so that the rainwater will not penetrate into the thrust bearing along the junction of the fixed sleeve and the transmission shaft.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors, and in particular to a waterproof screw pump direct-drive permanent magnet motor. Background Art

[0002] For downhole screw pumps, the motor structure drives the screw pump in essence. Considering the requirements for on-site (outdoor) use, the downhole screw pump rod passes through the motor hollow shaft and is fixed with a clip. The motor structure drives the rod to rotate to drive the downhole screw pump. Combined with the conventional structure, it is explained that the original screw pump hollow shaft needs to be used in conjunction with the lower sealing cover. There is a gap between the hollow shaft and the sealing cover. During on-site operation, rainwater may enter the thrust bearing chamber at the bottom of the motor through the gap, causing the lubricating oil to be contaminated and deteriorated, greatly shortening the service life of the bearing, and even eventually causing damage to the motor.

[0003] This application proposes a solution to this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a waterproof screw pump direct-drive permanent magnet motor. For downhole screw pumps used on site, based on the conventional sealing structure, liquids such as rainwater will penetrate along the gaps of the sealing structure, specifically affecting the thrust bearing chamber in the motor, causing the lubricating oil to be contaminated and deteriorated, thereby damaging the motor.

[0005] The object of the present invention can be achieved by the following technical scheme: a waterproof screw pump direct-drive permanent magnet motor, comprising a motor structure, a thrust bearing and a screw pump group, a coupling sleeve group is arranged between the output shaft of the motor structure and the thrust bearing, the coupling sleeve group comprises an upper sleeve, a transmission shaft, a lower sleeve, a fixed sleeve, a movable cap sleeve and a fixed cap sleeve, the transmission shaft is connected to the output end position of the thrust bearing, the fixed cap sleeve is installed on the transmission shaft, and the movable cap sleeve is arranged on the upper side position of the fixed cap sleeve;

[0006] A directional flow chamber is arranged between the lower surface of the fixed cap sleeve and the upper position of the fixed shaft sleeve, and a fluctuating flow chamber is arranged between the upper surface of the movable cap sleeve and the inside of the lower shaft sleeve, and between the lower surface of the movable cap sleeve and the upper surface of the fixed cap sleeve. An inner flow channel is opened at the upper inner wall of the movable cap sleeve, and a vertically arranged through flow channel is opened on the movable cap sleeve. The through flow channel is arranged in a circular array along the center point of the movable cap sleeve, and the two fluctuating flow chambers are connected through the through flow channel.

[0007] It is further configured as follows: the upper sleeve, the lower sleeve and the fixed sleeve are arranged in sequence from top to bottom, the transmission shaft is rotationally connected to the fixed sleeve and the upper sleeve, and the fixed sleeve is installed on a thrust bearing.

[0008] It is further configured as follows: a sealing ring and a ball bearing are respectively arranged inside the lower sleeve along the direction from top to bottom, a connecting spring is installed at the lower side of the ball bearing, and the lower end of the connecting spring is connected to the movable cap sleeve.

[0009] It is further configured as follows: the cross-section of the lower end of the lower sleeve and the cross-section of the upper end of the fixed sleeve are both truncated cone-shaped, the cross-section of the lower end position of the fixed cap sleeve is truncated cone-shaped and matches the surface of the upper end position of the fixed sleeve, and the upper end of the fixed cap sleeve is annular, the inner wall of the upper end of the movable cap sleeve matches the outer wall of the upper end of the fixed cap sleeve, and the outer surface of the movable cap sleeve matches the inner wall of the lower side of the lower sleeve.

[0010] It is further configured as follows: the upper surface of the sealing ring is higher than the upper surface of the lower sleeve, the inner wall diameter of the sealing ring is larger than the outer diameter of the transmission shaft, and a threaded protrusion is arranged on the inner wall of the sealing ring.

[0011] It is further configured as follows: a fan blade group is installed on the inclined position of the fixed cap sleeve, the through flow channel is located above the fan blade group, the length of the inner flow channel is smaller than the height of the circular ring position at the upper end of the fixed cap sleeve, and the upper end position of the inner flow channel extends to the upper surface position of the movable cap sleeve.

[0012] The present invention has the following beneficial effects:

[0013] The overall structure is based on the downhole screw pump, and a coupling structure between the motor structure and the screw pump is specifically proposed, which is mainly used to isolate rainwater that penetrates into the lower sleeve along the gap between the upper sleeve and the lower sleeve, and prevents rainwater from further penetrating into the thrust bearing and contaminating the lubricating oil therein. Specifically, the sealing ring is used as the sealing structure as the basis, and a fixed cap sleeve and a movable cap sleeve are added synchronously, wherein the fixed cap sleeve can rotate synchronously with the transmission shaft, and the movable cap sleeve can be understood as being independent of the fixed cap sleeve and the lower sleeve, and further restricts the structural shape of the upper end part of the fixed sleeve, the fixed cap sleeve and the movable cap sleeve, which is specifically manifested as an inclined surface in the downward direction, so that rainwater that penetrates into the lower sleeve can be directed along the above-mentioned inclined surface, and the directional flow chamber will not cause rainwater to violate the direction of gravity and penetrate into the connection between the fixed sleeve and the transmission shaft;

[0014] In combination with the above content, it is explained again that the movable cap sleeve will not rotate synchronously with the fixed cap sleeve, but will move slightly in the vertical direction under the action of gravity. This process mainly changes the linkage state of the wave flow bins at the upper and lower sides, and the fixed cap sleeve rotates synchronously with the transmission shaft. The purpose is to make the fan blade group generate a vertical downward guiding airflow. The purpose is to "force" the vertical movement process of the movable cap sleeve. In addition, it can also guide rainwater that may exist inside the lower sleeve, and finally it can only flow out along the inclined surface at the upper end of the fixed sleeve, and will not seep back into the thrust bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0017] Figure 2 This is a schematic structural diagram of a coupling sleeve assembly in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0018] Figure 3 This is a disassembled diagram of a coupling sleeve assembly in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0019] Figure 4 A cross-sectional view of a coupling sleeve assembly in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0020] Figure 5 A schematic diagram of the working position of a coupling sleeve in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0021] Figure 6 A cross-sectional view of a movable cap sleeve in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention;

[0022] Figure 7 This is a schematic structural diagram of a sealing ring in a waterproof screw pump direct-drive permanent magnet motor proposed by the present invention.

[0023] In the figure: 1. Motor structure; 2. Upper sleeve; 3. Lower sleeve; 4. Fixed sleeve; 5. Thrust bearing; 6. Screw pump group; 7. Sealing ring; 8. Ball bearing; 9. Transmission shaft; 10. Movable cap sleeve; 11. Fluctuating flow chamber; 12. Fixed cap sleeve; 13. Directional flow chamber; 14. Connecting spring; 15. Sector group; 16. Inner flow channel; 17. Through flow channel. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1: For downhole screw pumps used on site, based on conventional sealing structures, liquids such as rainwater will penetrate along the gaps of the sealing structure, specifically affecting the thrust bearing chamber in the motor, causing the lubricating oil to be contaminated and deteriorated, thereby damaging the motor. The following related technical structures are proposed:

[0026] Reference Figures 1 to 7 In this embodiment, a waterproof screw pump direct-drive permanent magnet motor includes a motor structure 1, a thrust bearing 5 and a screw pump group 6. A coupling sleeve group is arranged between the output shaft of the motor structure 1 and the thrust bearing 5. The coupling sleeve group includes an upper sleeve 2, a transmission shaft 9, a lower sleeve 3, a fixed sleeve 4, a movable cap sleeve 10 and a fixed cap sleeve 12. The transmission shaft 9 is connected to the output end position of the thrust bearing 5, the fixed cap sleeve 12 is installed on the transmission shaft 9, and the movable cap sleeve 10 is arranged on the upper side of the fixed cap sleeve 12;

[0027] A directional flow chamber 13 is arranged between the lower surface of the fixed cap sleeve 12 and the upper position of the fixed shaft sleeve 4, and a fluctuating flow chamber 11 is arranged between the upper surface of the movable cap sleeve 10 and the inside of the lower shaft sleeve 3, and between the lower surface of the movable cap sleeve 10 and the upper surface of the fixed cap sleeve 12. An inner flow channel 16 is opened at the upper inner wall position of the movable cap sleeve 10, and a vertically arranged through flow channel 17 is opened on the movable cap sleeve 10. The through flow channel 17 is arranged in a circular array along the center point of the movable cap sleeve 10. The two fluctuating flow chambers 11 are connected through the through flow channel 17. The upper shaft sleeve 2, the lower shaft sleeve 3, and the fixed shaft sleeve 4 are arranged in sequence from top to bottom. The transmission shaft 9 is rotatably connected to the fixed shaft sleeve 4 and the upper shaft sleeve 2, and the fixed shaft sleeve 4 is installed on the thrust bearing 5.

[0028] Working principle: The overall structure is based on the structure of a conventional downhole screw pump. Figure 1 As shown, the motor structure 1 provides power and transmits it to the thrust bearing 5 and the screw pump group 6 along the transmission shaft 9. The specific operation process is not described in the present invention.

[0029] It should be noted that the coupling sleeve used to fix the transmission shaft 9 is specifically referred to Figure 2 The conventional coupling method is based on the upper sleeve 2 and the lower sleeve 3, and includes conventional structures such as a sealing ring 7 and a ball bearing 8. After the upper sleeve 2 and the lower sleeve 3 are connected and fixed to each other, the sealing ring 7 is mainly used to seal the gap between the upper sleeve 2 and the lower sleeve 3. However, during long-term operation, because the operating environment of the overall structure is mainly outdoors, rainwater in the external environment still penetrates into the lower sleeve 3 through the gap between the upper sleeve 2 and the lower sleeve 3. Figure 4 It is explained that rainwater that penetrates into the lower sleeve 3 may slowly penetrate into the thrust bearing 5 along the transmission shaft 9 and contaminate the lubricating oil medium in the thrust bearing 5. This is the problem that the present invention needs to solve.

[0030] Therefore, in this embodiment, a fixed cap sleeve 12 and a movable cap sleeve 10 are added again in a conventional coupling manner, and the structural appearance of the lower sleeve 3, the fixed cap sleeve 12 and the movable cap sleeve 10 are further restricted, wherein the upper end position of the fixed cap sleeve 12 is fixed to the transmission shaft 9, so that it can be understood that: if there is only the fixed cap sleeve 12 but no movable cap sleeve 10, the rainwater infiltrated into the lower sleeve 3 can only flow downward along the outer wall slope of the fixed cap sleeve 12, thereby having the function of rainwater drainage, which is the basic principle of the present invention;

[0031] However, the fixed cap sleeve 12 needs to be used synchronously with the movable cap sleeve 10. In theory, the movable cap sleeve 10 is provided with a wave flow bin 11 on the upper and lower sides corresponding to the lower sleeve 3 and the fixed cap sleeve 12, but the wave flow bin 11 is in a wave-connected state. It should be noted that the transmission shaft 9 and the fixed sleeve 4 still maintain a rotation state, so it can be understood that the intersection between the transmission shaft 9 and the fixed sleeve 4 is the only channel for rainwater to penetrate into the thrust bearing 5, and as shown above, under the action of gravity, rainwater will not flow upward along the inclined surface of the upper part of the fixed sleeve 4, and then it can play a role in initially isolating rainwater.

[0032] Embodiment 2: This embodiment is to explain the relevant structure in the coupling sleeve assembly:

[0033] The cross-sections of the lower end of the lower sleeve 3 and the upper end of the fixed sleeve 4 are both truncated cone-shaped. The cross-section of the lower end position of the fixed cap sleeve 12 is truncated cone-shaped and matches the surface of the upper end position of the fixed sleeve 4, and the upper end of the fixed cap sleeve 12 is annular. The inner wall of the upper end of the movable cap sleeve 10 matches the outer wall of the upper end of the fixed cap sleeve 12. The outer surface of the movable cap sleeve 10 matches the inner wall of the lower side of the lower sleeve 3. The upper surface of the sealing ring 7 is higher than the upper surface of the lower sleeve 3, and the inner wall diameter of the sealing ring 7 is larger than the outer diameter of the transmission shaft 9. A threaded protrusion is provided on the inner wall of the sealing ring 7. A fan blade group 15 is installed on the inclined position of the fixed cap sleeve 12, and the through flow channel 17 is located above the fan blade group 15. The length of the inner flow channel 16 is less than the height of the upper end ring position of the fixed cap sleeve 12, and the upper end position of the inner flow channel 16 extends to the upper surface position of the movable cap sleeve 10.

[0034] Solution description: As described in the relevant content of Example 1, and refer to Figure 3 and Figure 4, in the initial state, it means that all technical structures in the coupling sleeve group are in the initial state. What needs to be indicated is that: under the traction of the connecting spring 14, the upper surface of the movable cap sleeve 10 is always completely matched with the lower inner wall of the lower sleeve 3, so that it can be understood that the wave flow bin 11 at the upper position is in a fully distributed state, so it can be understood that the through flow channel 17 in the movable cap sleeve 10 is in a useless state, and the wave flow bin 11 at the lower position is in a completely open state, and then the rainwater that may penetrate into the lower sleeve 3 cannot flow out through the wave flow bin 11 at the upper position, so it is always "stored" in the middle position between the ball bearing 8 and the movable cap sleeve 10. What needs to be said is: refer to Figure 6 Explanation: Rainwater can enter the inner flow channel 16, because the movable cap cover 12 and the fixed cap cover 12 are in a state of relative rotation, and the fixed cap cover 12 rotates synchronously with the transmission shaft 9, so that the rainwater falling into the large inner flow channel 16 can serve as a "lubricating medium" when the movable cap cover 12 and the fixed cap cover 12 rotate relative to each other.

[0035] Embodiment 3: This embodiment combines Embodiment 1 and Embodiment 2, and provides the following description of the operation process of the overall structure:

[0036] S1: As shown in the second embodiment, because the wave flow chamber 11 at the upper position is in a fully distributed state, the rainwater is always "stored" in the inner flow channel 16, and as shown in the first embodiment, because the fixed cap sleeve 12 and the transmission shaft 9 are kept fixed, the directional flow chamber 13 therein is always kept in a stable open state, the purpose of which is to avoid reducing the friction loss between the fixed cap sleeve 12 and the fixed shaft sleeve 4;

[0037] S2: Reference Figure 5 To illustrate, the inner wall position of the upper end of the movable cap cover 10 matches the upper end position of the fixed cap cover 12, that is, the upper end portion of the movable cap cover 10 is also annular, thereby ensuring that the movable cap cover 10 and the fixed cap cover 12 only slide in the vertical direction, and limiting the total length of the inner flow channel 16, and referring to Figure 6 For explanation, a threaded inner flow channel 16 is also provided on the inner wall of the movable cap cover 10 corresponding to the inner flow channel 16, and the purpose of this is to use rainwater as a "lubricating medium" to reduce the friction loss between the fixed cap cover 12 and the movable cap cover 10;

[0038] S3: The fixed cap sleeve 12 rotates synchronously with the transmission shaft 9, see Figure 3The fixed cap sleeve 12 in the embodiment further includes a blade group 15, which is specifically used to generate airflow in the corresponding direction by using the synchronously rotating blade group 15. In this embodiment, when the rotation direction of the transmission shaft 9 remains stable, the installation angle of the blade group 15 is limited so that the airflow generated by the blade group 15 is in the direction from top to bottom. The second embodiment is described again as follows: on the one hand, as the amount of rainwater infiltrating into the lower sleeve 3 increases, and under the action of guiding the airflow, the movable cap sleeve 10 is in a downward moving state. This part refers to Figure 5 It can be found that: the inner wall position of the upper end of the movable cap cover 10 is always in contact with the upper end position of the fixed cap cover 12, and the wave flow bin 11 at the upper side of the movable cap cover 10 is switched from a completely closed state to an open state, and the wave flow bin 11 at the lower side of the movable cap cover 10 is switched from a completely open state to a state of reduced regional space, and then the rainwater has a discharge method:

[0039] A1: Rainwater that penetrates into the lower sleeve 3 mainly flows out along the wave flow chamber 11 at the upper side;

[0040] A2: Rainwater can also flow into the wave flow chamber 11 at the lower position through the through flow channel 17, and be discharged from the wave flow chamber 11 at the lower position;

[0041] A3: Based on A2, a portion of the rainwater can also flow out from the directional flow chamber 13.

[0042] In combination with the above content, it is explained that: in the initial state, rainwater that has penetrated into the lower shaft sleeve 3 may penetrate into the fluctuating flow bin 11 at the lower position through the intersection of the fixed cap sleeve 12 and the upper end of the movable cap sleeve 10 and be discharged. However, in the present invention, the key point is that the fixed cap sleeve 12 continuously generates a downward guiding airflow during synchronous rotation. The purpose is to ensure that the interior of the directional flow bin 13 is always in a relatively dry and rain-free state, and the guiding airflow also plays a role in "accelerating" the rainwater discharge process when guiding the rainwater to discharge. However, the discharge process not only includes the liquid state, but the guiding airflow can also be used to volatilize and discharge the rainwater, thereby also having the function of guiding and discharging gaseous rainwater.

[0043] To sum up: based on the downhole screw pump, a coupling structure between the motor and the screw pump is proposed, which is mainly used to isolate rainwater and prevent rainwater from entering the thrust bearing and contaminating the lubricating oil therein. Specifically, with the sealing ring as the sealing structure, a fixed cap sleeve and a movable cap sleeve that cooperate with each other are added, and the fixed cap sleeve rotates synchronously with the normal rotation of the transmission shaft. When combined with the technical structure of the fan blade group, the fixed cap sleeve always generates a guiding airflow in the downward direction, and the guiding airflow corresponds to the through-flow channel, and the movable cap sleeve can be directed in a small amplitude in the vertical direction, so that the fluctuating flow bin at the upper or lower position is in an open state, which is specifically used for directed drainage of rainwater that has penetrated into the lower sleeve, so that rainwater will not penetrate into the thrust bearing along the junction of the fixed sleeve and the transmission shaft.

[0044] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A waterproof screw pump direct-drive permanent magnet motor, comprising a motor structure (1), a thrust bearing (5) and a screw pump assembly (6), It is characterized in that A coupling sleeve group is arranged between the output shaft of the motor structure (1) and the thrust bearing (5), the coupling sleeve group comprising an upper sleeve (2), a transmission shaft (9), a lower sleeve (3), a fixed sleeve (4), a movable cap sleeve (10) and a fixed cap sleeve (12), the transmission shaft (9) being connected to the output end of the thrust bearing (5), the fixed cap sleeve (12) being mounted on the transmission shaft (9), and the movable cap sleeve (10) being arranged at an upper side of the fixed cap sleeve (12); A directional flow chamber (13) is arranged between the lower surface of the fixed cap sleeve (12) and the upper position of the fixed shaft sleeve (4); a fluctuating flow chamber (11) is arranged between the upper surface of the movable cap sleeve (10) and the interior of the lower shaft sleeve (3), and between the lower surface of the movable cap sleeve (10) and the upper surface of the fixed cap sleeve (12); an inner flow channel (16) is provided at the upper inner wall position of the movable cap sleeve (10), and a vertically arranged through-flow channel (17) is provided on the movable cap sleeve (10); the through-flow channel (17) is arranged in a ring array along the center point of the movable cap sleeve (10), and the two fluctuating flow chambers (11) are connected via the through-flow channel (17); The cross-section of the lower end of the lower sleeve (3) and the cross-section of the upper end of the fixed sleeve (4) are both truncated cone-shaped; the cross-section of the lower end of the fixed sleeve (12) is truncated cone-shaped and matches the surface of the upper end of the fixed sleeve (4); the upper end of the fixed sleeve (12) is annular; the inner wall of the upper end of the movable sleeve (10) matches the outer wall of the upper end of the fixed sleeve (12); the outer surface of the movable sleeve (10) matches the inner wall of the lower side of the lower sleeve (3); a blade group (15) is installed on the inclined surface of the fixed sleeve (12); the through flow channel (17) is located above the blade group (15); the length of the inner flow channel (16) is less than the height of the upper end of the fixed sleeve (12) and the upper end of the inner flow channel (16) extends to the upper surface of the movable sleeve (10).

2. A waterproof screw pump direct drive permanent magnet motor according to claim 1, It is characterized in that The upper shaft sleeve (2), the lower shaft sleeve (3) and the fixed shaft sleeve (4) are arranged in sequence from top to bottom, the transmission shaft (9) is rotatably connected to the fixed shaft sleeve (4) and the upper shaft sleeve (2), and the fixed shaft sleeve (4) is mounted on a thrust bearing (5).

3. A waterproof screw pump direct drive permanent magnet motor according to claim 2, It is characterized in that A sealing ring (7) and a ball bearing (8) are respectively arranged inside the lower shaft sleeve (3) in a direction from top to bottom. A connecting spring (14) is installed at a position below the ball bearing (8). The lower end of the connecting spring (14) is connected to the movable cap sleeve (10).

4. A waterproof screw pump direct-drive permanent magnet motor according to claim 3, It is characterized in that The upper surface of the sealing ring (7) is higher than the upper surface of the lower shaft sleeve (3), and the inner wall diameter of the sealing ring (7) is larger than the outer diameter of the transmission shaft (9). A threaded protrusion is provided on the inner wall of the sealing ring (7).

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