Axial force automatic compensation mechanism of low-temperature immersed pump bearing

Abstract

The utility model discloses an axial force automatic compensation mechanism of a low-temperature immersed pump bearing, the automatic compensation mechanism comprises a mounting disc and an elastic piece, the mounting disc is mounted at the outer end of the low-temperature immersed pump bearing, the elastic piece is connected between the inner wall of the low-temperature immersed pump and the mounting disc, and the elastic piece is connected with the mounting disc. And the bearing can linearly move in the low-temperature immersed pump through the elastic piece. According to the automatic compensation mechanism, the elastic piece and the mounting disc are arranged between the bearing and the shell of the immersed pump, so that the rotating shaft and the bearing can linearly move in the shell due to liquid impact force and temperature difference when the immersed pump works under liquid, and therefore, the situation that an inner ring and an outer ring of the bearing are staggered due to movement of the bearing when the bearing is connected with the shell is prevented; the service life of the bearing is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of pumping devices, in particular to an automatic axial force compensation mechanism for a low-temperature submersible pump bearing. Background Art

[0002] A cryogenic submersible pump is a device used to pump liquids, usually comprising a pump casing, a rotating shaft and an impeller. The rotating shaft is coaxially inserted in the pump casing and can be rotatably mounted. The impeller is mounted at the bottom end of the rotating shaft and immersed in the liquid cargo. During the operation of the cryogenic submersible pump, the impeller is driven to rotate by the rotating shaft to pump out the liquid cargo.

[0003] However, when low-pressure liquid enters the water inlet of the impeller, it is converted into high-pressure liquid under the action of centrifugal force and pumped out from the water outlet. The high-pressure liquid will exert a force on the impeller along the axis of the shaft and pointing to the water inlet. This force will be transmitted to the shaft through the impeller and further to the bearings installed on the shaft, causing the bearings to wear more severely under the influence of the axial force.

[0004] In order to increase the service life of the bearing connecting the housing and the rotating shaft, some submersible pumps are equipped with a spring sheet on the side of the bearing, one end of the spring sheet is pressed against the outer ring of the bearing, and the other end is pressed against the end of the housing, while the inner ring of the bearing is sleeved on the rotating shaft. The bearing and the housing are separated by the setting of the spring sheet, which can ensure that the rotating shaft and the bearing will move a certain distance compared to the housing when subjected to axial force. However, the spring sheet cannot guarantee the length of movement, that is, the moving distance of the rotating shaft and the bearing is very short. When the submersible pump draws liquid in the liquid, due to changes in the pressure and temperature of the liquid, it is very likely that the displacement of the rotating shaft and the bearing will exceed the maximum movement allowed by the spring sheet, thereby causing the spring sheet to break. Utility Model Content

[0005] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides an automatic axial force compensation mechanism for the bearing of a low-temperature submersible pump. The mechanism is to set a mounting plate between the bearing and the housing, and to set an elastic member between the mounting plate and the housing, which can effectively increase the moving distance between the bearing and the rotating shaft and ensure the service life of the bearing.

[0006] The utility model is implemented in this way: an automatic axial force compensation mechanism for a low-temperature submersible pump bearing is constructed, and the automatic compensation mechanism includes a mounting plate and an elastic member, wherein the mounting plate is mounted on the outer end of the bearing of the low-temperature submersible pump, and the elastic member is connected between the inner wall of the low-temperature submersible pump and the mounting plate, and the bearing is kept linearly movable in the low-temperature submersible pump by the elastic member.

[0007] Furthermore, the cryogenic submersible pump comprises a housing with openings on both sides and provided with a connecting disc;

[0008] The rotating shaft passes through the connecting disc and is coaxially arranged with the shell;

[0009] The bearing is sleeved on the outer end of the rotating shaft.

[0010] Furthermore, a mounting groove for installing a bearing and a mounting plate is opened on the inner side of the connecting disc. The bearing is placed in the mounting groove and sleeved on the outer end of the rotating shaft. One end of the mounting plate is inserted into the mounting groove and sleeved on the outer ring of the bearing. The other end of the mounting plate corresponds to the side surface of the connecting disc and is connected together by fasteners.

[0011] Through the above arrangement, the installation groove is opened to facilitate the installation of the bearing and the installation disk on the outer end of the bearing, and it is convenient to install the elastic member on the side of the installation disk and the connecting disk, thereby ensuring that the rotating shaft and the bearing can move along the axial direction without affecting the elastic member.

[0012] Furthermore, the fastener includes a fastening screw, a screw sleeve and a sliding sleeve. The fastening screw is screwed into the threaded hole of the connecting disc, the screw sleeve is sleeved on the outer end of the fastening screw and a limiting platform is provided on the outer end. The head of the fastening screw presses the screw sleeve against the side of the connecting disc, and the sliding sleeve is sleeved on the outer end of the screw sleeve to maintain sliding. The mounting plate is provided with a connecting hole adapted to the outer diameter of the sliding sleeve, and is fixed to the sliding sleeve through the connecting hole. As the sliding sleeve slides on the outside of the screw sleeve, the limiting platform of the screw sleeve limits the mounting plate.

[0013] Through the above-mentioned configuration, the screw sleeve and the fastening screw are provided to facilitate connecting the mounting plate to the side of the connecting disc. By providing the sliding sleeve and the limit platform of the screw sleeve, the mounting plate can be easily slid and limited on the screw sleeve, thereby realizing the axial movement of the mounting plate.

[0014] Furthermore, mounting holes are provided on the outer side surface of the mounting groove of the connecting disc and distributed along the circumference of the mounting groove. An elastic member is provided in the mounting hole, and the other end of the elastic member contacts the mounting disc, so that a gap is maintained between the mounting disc and the side surface of the connecting disc by the elastic member.

[0015] By means of the above arrangement, an elastic member is arranged between the side of the connecting disc and the mounting disc, so that a gap is generated between the connecting disc and the mounting disc, thereby ensuring that the mounting disc does not collide with the connecting disc when the rotating shaft and the bearing axis are displaced.

[0016] Furthermore, the elastic member is a spring.

[0017] The spring is arranged to facilitate expansion and contraction along the axial direction of the rotating shaft, thereby adapting to the movement of the rotating shaft and the bearing in the axial direction and ensuring the service life of the spring.

[0018] Furthermore, a shoulder is provided on one end of the rotating shaft close to the connecting disc mounting groove, one end of the bearing is fixed by the shoulder, a fixing ring is provided at the other end of the bearing, the fixing ring is sleeved on the outer end of the rotating shaft, and a stopper is also provided on the shoulder of the rotating shaft.

[0019] Through the above-mentioned arrangement, the shaft shoulder and the fixing ring are provided to facilitate fixing the bearing on the rotating shaft, and the stopper is provided on the shaft shoulder, which can not only prevent the high-pressure liquid from directly impacting the bearing and causing the inner and outer rings of the bearing to be misaligned, but also facilitate driving the outer ring and the inner ring of the bearing to move together during displacement.

[0020] The utility model has the following beneficial effects:

[0021] 1. The compensation structure has a mounting groove on the inner side of the connecting disc, which is convenient for mounting the bearing and one end of the mounting disc on the connecting portion between the rotating shaft and the connecting disc, and is convenient for the subsequent installation of the elastic member.

[0022] 2. The compensation structure is provided with elastic parts on the sides of the mounting plate and the connecting disc, so that the shaft, the bearing and the mounting plate can be driven to move along the axial direction through the expansion and contraction of the elastic parts, which not only ensures the service life of the elastic parts, but also ensures the service life of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the specific implementation of the present invention, they are used to explain the present invention, but do not constitute any limitation to the present invention. In the accompanying drawings:

[0024] Figure 1 It is a cross-sectional schematic diagram of the connection between the rotating shaft, the bearing and the housing of the prior art submersible pump;

[0025] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0026] Figure 3 It is a cross-sectional schematic diagram of the utility model when the rotating shaft, the bearing and the housing are connected;

[0027] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0028] Figure 5 It is a partial cross-sectional schematic diagram of the utility model (where the sectioning position is on the fastener);

[0029] Figure 6 It is a partial cross-sectional schematic diagram of the utility model when the bearing is connected with the housing and the rotating shaft;

[0030] Figure 7 yes Figure 6 The structural diagram of removing the mounting plate;

[0031] In the figure: 1, spring sheet; 2, housing; 3, rotating shaft; 4, connecting disc; 5, stopper; 6, bearing; 7, fixing ring; 8, mounting plate; 9, fastening screw; 10, elastic member; 11, gap; 12, screw sleeve; 13, sliding sleeve. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below through specific embodiments and in combination with the accompanying drawings; it should be understood that the implementation methods described herein are only used to illustrate and explain the present invention, and are not intended to limit the present invention in any way; the accompanying drawings in the present invention are only used to assist in the description of the embodiments and to facilitate understanding, and are not intended to limit the present invention in any way.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] As described in the background art, when the existing submersible pump is in use, the flow of liquid inside the housing causes the bearing to bear a large axial force, thereby causing the bearing to wear more severely.

[0035] like Figure 1 and Figure 2 As shown, in order to solve the above problem, a part of the submersible pump is provided with a spring sheet 1 on the side of the bearing, and the outer ring of the bearing is connected to the housing through the spring sheet 1, which can ensure that the bearing and the rotating shaft are displaced a certain distance along the axial direction. However, due to the limitation of the spring sheet 1, the displacement is small. When the rotating shaft and the bearing work in the cryogenic liquid, the impact force of the liquid and the influence of temperature may cause the displacement to increase, thereby causing the spring sheet 1 to break.

[0036] Based on the above reasons, the utility model provides a technical solution: an automatic axial force compensation mechanism for a low-temperature submersible pump bearing, the automatic compensation mechanism comprising a mounting disk 8 and an elastic member 10, the mounting disk 8 being mounted on the outer end of the bearing of the low-temperature submersible pump, the elastic member 10 being connected between the inner wall of the low-temperature submersible pump and the mounting disk 8, and the elastic member 10 being used to maintain the bearing to be able to move linearly in the low-temperature submersible pump.

[0037] The cryogenic submersible pump comprises a housing 2, which is open on both sides and provided with a connecting disc 4;

[0038] The rotating shaft 3 passes through the connecting disc 8 and is coaxially arranged with the housing 2;

[0039] The bearing 6 is sleeved on the outer end of the rotating shaft 3;

[0040] Through the above-mentioned arrangement, a mounting plate is provided between the bearing and the submersible pump, and an elastic member is provided between the mounting plate and the submersible pump, so as to ensure that the bearing is separated from the housing of the submersible pump, thereby facilitating the linear movement of the bearing in the housing, ensuring the service life of the bearing, and preventing the elastic member from breaking due to excessive movement.

[0041] Please refer to the attached Figure 4 In this embodiment, a mounting groove for mounting a bearing 6 and a mounting plate 8 is opened on the inner side of the connecting disc 4. The bearing 6 is placed in the mounting groove and sleeved on the outer end of the rotating shaft 2. One end of the mounting plate 8 is inserted into the mounting groove and sleeved on the outer ring of the bearing 6. The other end of the mounting plate 8 corresponds to the side of the connecting disc 4 and is connected together by fasteners.

[0042] Through the above arrangement, the installation groove is opened to facilitate the installation of the bearing and the installation disk is sleeved on the outer end of the bearing, and it is convenient to install the elastic member on the side of the installation disk and the connecting disk, thereby ensuring that the rotating shaft and the bearing can be displaced along the axial direction without affecting the elastic member.

[0043] Please refer to the attached Figure 5 Furthermore, the fastener includes a fastening screw 9, a screw sleeve 12 and a sliding sleeve 13. The fastening screw 9 is screwed into the threaded hole of the connecting disc 4. The screw sleeve 12 is sleeved on the outer end of the fastening screw 9 and a limiting platform is provided on the outer end. The head of the fastening screw 9 presses the screw sleeve against the side of the connecting disc 4. The sliding sleeve 13 is sleeved on the outer end of the screw sleeve 12 to keep sliding. The mounting plate 8 is provided with a connecting hole adapted to the outer diameter of the sliding sleeve 13, and is fixed on the sliding sleeve 13 through the connecting hole. As the sliding sleeve 13 slides on the outside of the screw sleeve 12, the limiting platform of the screw sleeve 12 limits the mounting plate 8.

[0044] Through the above-mentioned configuration, the screw sleeve and the fastening screw are provided to facilitate connecting the mounting plate to the side of the connecting disc. By providing the sliding sleeve and the limit platform of the screw sleeve, the mounting plate can be easily slid and limited on the screw sleeve, thereby realizing the axial movement of the mounting plate.

[0045] Please refer to the attached Figure 6 ~Attached Figure 7 In this embodiment, mounting holes are provided on the outer side surface of the mounting groove of the connecting disc 4 and are distributed along the circumference of the mounting groove. An elastic member 10 is provided in the mounting hole. The other end of the elastic member 10 is in contact with the mounting disc 8. The elastic member 10 maintains a gap 11 between the mounting disc 8 and the side of the connecting disc 4.

[0046] By means of the above arrangement, an elastic member is arranged between the side of the connecting disc and the mounting disc, so that a gap is generated between the connecting disc and the mounting disc, thereby ensuring that the mounting disc does not collide with the connecting disc when the rotating shaft and the bearing axis are displaced.

[0047] Please refer to the attached Figure 7 In this embodiment, the elastic member 10 is a spring.

[0048] The spring is arranged to facilitate expansion and contraction along the axial direction of the rotating shaft, thereby adapting to the movement of the rotating shaft and the bearing in the axial direction and ensuring the service life of the spring.

[0049] Please refer to the attached Figure 4 In this embodiment, a shoulder is provided on one end of the rotating shaft 2 close to the mounting groove of the connecting disc 4, one end of the bearing 6 is fixed by the shoulder, and a fixing ring 7 is provided at the other end of the bearing 6. The fixing ring 7 is sleeved on the outer end of the rotating shaft 2, and a stopper 5 is also provided on the shoulder of the rotating shaft 2.

[0050] Through the above-mentioned arrangement, the shaft shoulder and the fixing ring are provided to facilitate fixing the bearing on the rotating shaft, and the stopper is provided on the shaft shoulder, which can not only prevent the high-pressure liquid from directly impacting the bearing and causing the inner and outer rings of the bearing to be misaligned, but also facilitate driving the outer ring and the inner ring of the bearing to move together during displacement.

[0051] During use of the submersible pump equipped with the compensation mechanism, the shaft 3 rotates with the external drive motor, and the liquid is converted into high-pressure liquid under the action of the impeller and enters the shell 2. The impact force generated by the high-pressure liquid hits the shell 2, the connecting disc 4 and the shaft 3. Since the shell 2 and the connecting disc 4 are fixed in the liquid, they will not move. When hitting the shaft 3, since a bearing 6 and a mounting disc 8 are arranged between the shaft 3 and the connecting disc 4, and a stopper 5 is arranged on the outer side of the bearing 6, the stopper 5 and the mounting disc 8 will be hit, thereby protecting the bearing 6. In addition, an axial force is generated on the shaft 3 and the bearing 6 during the impact process, pushing the bearing 6 and the shaft 3 to axially displace. During the displacement process, the mounting disc 8 squeezes the elastic member 10, thereby protecting the inner and outer rings of the bearing 6 from being misaligned, effectively extending the service life of the bearing 6.

[0052] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. An automatic axial force compensation mechanism for a low-temperature submersible pump bearing, characterized in that: The automatic compensation mechanism includes a mounting plate and an elastic member, wherein the mounting plate is mounted on the outer end of the bearing of the cryogenic submersible pump, and the elastic member is connected between the inner wall of the cryogenic submersible pump and the mounting plate. The elastic member keeps the bearing able to move linearly in the cryogenic submersible pump.

2. According to claim 1, the automatic axial force compensation mechanism of the low-temperature submersible pump bearing is characterized by: The cryogenic submersible pump comprises a housing with openings on both sides and provided with a connecting disc; The rotating shaft passes through the connecting disc and is coaxially arranged with the shell; The bearing is sleeved on the outer end of the rotating shaft.

3. According to claim 2, the automatic axial force compensation mechanism of the low-temperature submersible pump bearing is characterized by: The inner side of the connecting disc is provided with an installation groove for installing the bearing and the installation disc. The bearing is placed in the installation groove and sleeved on the outer end of the rotating shaft. One end of the installation disc is inserted into the installation groove and sleeved on the outer ring of the bearing. The other end of the installation disc corresponds to the side surface of the connecting disc and is connected together by fasteners.

4. According to claim 3, the automatic axial force compensation mechanism of the low-temperature submersible pump bearing is characterized by: The fastener includes a fastening screw, a screw sleeve and a sliding sleeve. The fastening screw is screwed into the threaded hole of the connecting disc. The screw sleeve is sleeved on the outer end of the fastening screw and a limiting platform is provided on the outer end. The head of the fastening screw presses the screw sleeve against the side of the connecting disc. The sliding sleeve is sleeved on the outer end of the screw sleeve to keep sliding. The mounting plate is provided with a connecting hole adapted to the outer diameter of the sliding sleeve and is fixed to the sliding sleeve through the connecting hole. As the sliding sleeve slides on the outside of the screw sleeve, the limiting platform of the screw sleeve limits the mounting plate.

5. According to claim 2, the automatic axial force compensation mechanism of the low-temperature submersible pump bearing is characterized by: The outer surface of the connecting disc having the mounting groove is provided with mounting holes distributed along the circumference of the mounting groove, and an elastic member is arranged in the mounting hole, and the other end of the elastic member contacts the mounting disc, and a gap is maintained between the mounting disc and the side of the connecting disc by the elastic member.

6. According to claim 3, the automatic axial force compensation mechanism of the low-temperature submersible pump bearing is characterized by: The elastic member is a spring.

7. The automatic axial force compensation mechanism for a low-temperature submersible pump bearing according to claim 2, characterized in that: A shoulder is provided on one end of the rotating shaft close to the connecting disc mounting groove, one end of the bearing is fixed by the shoulder, a fixing ring is provided at the other end of the bearing, the fixing ring is sleeved on the outer end of the rotating shaft, and a stopper is also provided on the shoulder of the rotating shaft.

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