Submersible pump base used in ultralow-temperature liquid tank

Abstract

A submersible pump base used in an ultralow-temperature liquid tank, arranged on a tank bottom stiffener in a pump well peripheral area at the bottom, and comprising two sub-parts symmetrically arranged about the central axis surface of a submersible pump (1). Each sub-part comprises: an upper support (2) fixedly connected to a head flange of the submersible pump (1) and a top plate (11) of a main body support (3); the main body support (3) located below the upper support (2) and used for force bearing in the vertical direction, wherein the lower end of the main body support (3) is fixedly connected to the tank bottom stiffener by means of a bottom plate (12); a box-shaped clamping member (7) fixedly arranged in a middle area of the submersible pump (1); and a slide support (4) fixedly arranged on a back plate (9) of the main body support (3), wherein first sliding blocks (81) are fixedly arranged right opposite to the box-shaped clamping member (7) at positions in the middle of the slide support (4), two side wing plates (15) passing through openings formed in the back plate (9) and used for sandwiching the box-shaped clamping member (7) are arranged on the side of the slide support (4) facing the box-shaped clamping member (7), and a second sliding block (82) is fixed to the side of each side wing plate (15) facing the box-shaped clamping member (7). The lower free end of the submersible pump is limited in the horizontal direction, and the displacement difference between a submersible pump body and the submersible pump base caused by thermal expansion and contraction is released by means of sliding in the vertical direction.

Description

Submerged liquid pump base for ultra-low temperature liquid tank

[0001] Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410419645.2, filed on April 9, 2024, and incorporates by reference the entire disclosure of the aforementioned patent application as part of this application. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of ship design, in particular to a submerged liquid pump base for an ultra-low temperature liquid tank. BACKGROUND

[0004] In recent years, with the rapid development of green energy technology, the demand for transportation of LNG (Liquefied Natural Gas) and LPG (liquefied petroleum gas) and other ultra-low temperature liquid cargo in the shipping market is increasing, and the demand for these ultra-low temperature liquid cargo as a substitute for ship dual fuel is also increasing. Whether as a transportation product or a ship fuel, these ultra-low temperature liquid cargo cannot be separated from the tank for storing these ultra-low temperature liquid cargo. In addition to the traditional thin film containment system tank, the proportion of independent containment system storage tanks (including types A, B, and C) is also growing rapidly. In particular, the order for independent type storage tanks as ship fuel tanks has surged, and large submerged liquid pumps can usually operate continuously in ultra-low temperature liquid tanks for a long time, and need to be replaced only after about 5 years, which causes less loss to the operating cost of the ship. It is the best choice for ship independent type storage tank fuel tank. However, due to the filling and extraction of ultra-low temperature liquid cargo in the liquid tank, there will be a large temperature difference, and the material of the tank body often has a large difference in thermal expansion and contraction performance with the material of the submerged liquid pump body. Therefore, when designing the base of the submerged liquid pump, it is necessary to consider the effective support for the smooth operation of the submerged liquid pump and the release of the deformation difference between the pump body and the base caused by the large temperature difference.

[0005] SUMMARY

[0006] In view of the above problems existing in the prior art, the present disclosure provides a submerged liquid pump base for an ultra-low temperature liquid tank, which is arranged on the tank bottom structure in the bottom pump well peripheral area of an independent type ultra-low temperature liquid tank. The upper support is used to fix the head of the submerged liquid pump, the main support is used as the main support to bear the force, and the sliding support, the sliding block and the box type latch are used to limit the free end below the submerged liquid pump in the horizontal direction and effectively release the thermal expansion and contraction displacement difference between the pump body and the base through vertical sliding. The submerged liquid pump base for an ultra-low temperature liquid tank can effectively support the large submerged liquid pump and ensure the smooth operation of the large submerged liquid pump. In addition, the structure type of the submerged liquid pump base for an ultra-low temperature liquid tank disclosed in the present application is not complex, and can be easily installed and disassembled.

[0007] The embodiment of the present disclosure provides a submerged pump base for a super-low temperature liquid tank, which is arranged on a tank bottom skeleton in a bottom pump well peripheral area of a separate type super-low temperature liquid tank, and comprises two subparts arranged in a center axis plane symmetry of the submerged pump, each of the subparts of the submerged pump base comprises:

[0008] an upper support fixedly connected with a head flange of the submerged pump at one end;

[0009] a main support vertically supporting below the upper support, an upper end of the main support being fixedly connected with the other end of the upper support through a top plate, and a lower end of the main support being fixedly connected with the tank bottom skeleton through a bottom plate;

[0010] a box type clamping tongue fixedly arranged in a middle area of the submerged pump;

[0011] a sliding support fixedly arranged on a back plate of the main support, and the back plate being provided with an opening corresponding to the box type clamping tongue, a first sliding block being fixedly arranged at a position of the sliding support opposite to the box type clamping tongue, and two side wing plates being arranged on a side of the sliding support facing the box type clamping tongue to clamp the box type clamping tongue, and a second sliding block being fixedly arranged on a side of each of the side wing plates facing the box type clamping tongue, wherein the first sliding block and the second sliding block are in contact with the box type clamping tongue without abutting against each other to limit a free end of the submerged pump in a horizontal direction and effectively release a displacement difference between the submerged pump body and the submerged pump base due to thermal expansion and contraction through vertical sliding.

[0012] In some embodiments of the present disclosure, an edge of the upper support at an end facing the submerged pump is provided in a circular arc shape and is matched with an arc of the head flange of the submerged pump, and an end of the upper support fixedly connected with the top plate is provided in a rectangular shape;

[0013] a plurality of circular holes in a circular arc shape are arranged on an edge of the end of the upper support provided in the circular arc shape and correspond to bolt holes on the head flange to fixedly connect the upper support and the head flange through fixed bolts;

[0014] a plurality of waist round type bolt holes and circular jacking bolt holes are arranged on an edge of the end of the upper support provided in the rectangular shape and correspond to bolt holes on the top plate, the circular jacking bolt holes are used to install jacking bolts, and the waist round type bolt holes are used to install fixed bolts to fixedly connect the upper support, the adjustment pad and the top plate.

[0015] In some embodiments of the present disclosure, the main body support further comprises two support elbow plates arranged between the top plate and the bottom plate and fixedly connected with the top plate, the bottom plate and the back plate, and the two support elbow plates are respectively located at two ends of the back plate.

[0016] The back plate is further provided with a reinforcing rib plate for reinforcing and fixing the support elbow plate and the top plate, and the reinforcing rib plate comprises a transverse reinforcing rib plate and a longitudinal reinforcing rib plate.

[0017] In some embodiments of the present disclosure, the opening in the back plate is capable of allowing two side wing plates to pass through, and the back plate is provided with a circular bolt hole at the edge of the opening for fixedly mounting the sliding support;

[0018] The back plate of the sliding support is in the shape of a rectangle, two ends of the back plate are provided with a waist-shaped bolt hole for fixedly connecting with the back plate of the main body support, and the middle part of the back plate of the sliding support is provided with two rows of slot holes arranged side by side for mounting the first sliding block and the sliding block stop plate;

[0019] The back plate of the sliding support is provided with a reinforcing rib plate for reinforcement and fixation.

[0020] In some embodiments of the present disclosure, the side wing plate is provided with a slot hole for mounting a second sliding block and a sliding block stop plate, and each side wing plate is provided with one second sliding block and a sliding block stop plate for fixing the second sliding block;

[0021] The reinforcing rib plate of the sliding support comprises a transverse rib plate, a vertical rib plate and a triangular plate, the transverse rib plate and the vertical rib plate are used to reinforce the strength of the back plate of the sliding support, and the triangular plate is used to reinforce the strength of the side wing plate of the sliding support.

[0022] In some embodiments of the present disclosure, the material of the first sliding block and the second sliding block is polytetrafluoroethylene, and the cross-sectional area of the part of the first sliding block and the second sliding block capable of being connected with the box-shaped clavus and clamped on the sliding support is smaller than the cross-sectional area of the end of the first sliding block and the second sliding block away from the box-shaped clavus, so that the first sliding block can be embedded in the slot hole on the back plate of the sliding support, and the second sliding block can be embedded in the slot hole of the side wing plate.

[0023] The thickness of the first sliding block and the second sliding block is polished and adjusted based on the assembly size between the sliding support, the main body support and the submersible pump.

[0024] In some embodiments of the present disclosure, the box-shaped clamping tongue is in the form of a hollow rectangular box as a whole, and the back surface of the box-shaped clamping tongue is provided with a bolt hole for fixing with the seat plate in the middle part of the submerged pump, so as to be fixedly connected with the submerged pump through the bolt arranged in the bolt hole.

[0025] Compared with the prior art, the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure has the beneficial effects that the submerged pump base for the ultra-low temperature liquid tank fixes the head of the submerged pump by using the upper support, the main support serves as the main support to bear the force, the sliding support, the sliding block and the box-shaped clamping tongue limit the free end below the submerged pump in the horizontal direction, and can effectively release the thermal expansion and cold shrink displacement difference between the pump body and the base through vertical sliding, so as to effectively support the large submerged pump and ensure the stable operation of the large submerged pump. Further, the structure type of the above-mentioned base is not complex and is convenient to manufacture, can effectively support the large submerged pump and ensure the stable operation of the large submerged pump, and can be conveniently installed and disassembled. Moreover, the main structure of the base does not need to be changed too much, and only the simple design modification of the connecting parts of the local part and the pump body can be applied to submerged pumps of different sizes and types, and only the adaptive adjustment of the distance of the local components of the main support can be applied to different structure types of the bottom of the liquid tank, so that the base has strong applicability and universality. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a three-dimensional schematic view of the arrangement of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0027] Fig. 2 is a front view of the arrangement of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0028] Fig. 3 is a cross-sectional view of A-A in Fig. 2;

[0029] Fig. 4 is a schematic view of the upper support of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0030] Fig. 5 is a schematic view of the adjusting pad plate of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0031] Fig. 6 is a view of B-B in Fig. 3;

[0032] Fig. 7 is a view of B1-B1 in Fig. 6;

[0033] Fig. 8 is a schematic view of the box-shaped clamping tongue of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0034] Fig. 9 is a schematic view of the main support of the submerged pump base for the ultra-low temperature liquid tank provided by the embodiments of the present disclosure;

[0035] Fig. 10 is a view of C-C in Fig. 9;

[0036] Fig. 11 is a schematic view of a sliding bracket for a submerged pump base in a super-low temperature liquid tank according to an embodiment of the present disclosure;

[0037] Fig. 12 is a D-D view of Fig. 11;

[0038] Fig. 13 is an E-E view of Fig. 11;

[0039] Fig. 14 is an assembly view of a sliding bracket, a sliding block and a sliding block stop plate for a submerged pump base in a super-low temperature liquid tank according to an embodiment of the present disclosure;

[0040] Fig. 15 is a schematic view of a sliding block for a submerged pump base in a super-low temperature liquid tank according to an embodiment of the present disclosure;

[0041] Fig. 16 is a F view of Fig. 15;

[0042] Fig. 17 is a schematic view of a sliding block stop plate according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail below with reference to the drawings and specific embodiments.

[0044] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0045] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the annexed drawings.

[0046] It is also to be understood that even though a number of specific embodiments of the present application have been described herein, many other modifications and / or

[0047] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0048] Specific embodiments of the present application are described herein with reference to the accompanying drawings. However, it is to be understood that the embodiments described are merely examples of the present application and that the application can be embodied in many other specific forms. Well-known and / or repeated functions and structures are not described in detail in order to avoid obscuring the present application in unnecessary detail. Therefore, the detailed description of specific structural and functional details set forth herein are not intended to limit the scope of the present application but merely serve as examples of the application, and are used as a basis for the claims and the representative claims to teach one skilled in the art of the present application with substantial scope as set forth in the appended claims.

[0049] The specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more embodiments according to the present application.

[0050] The embodiment of the present disclosure provides a submerged pump base for a super-low temperature liquid tank, as shown in FIGS. 1-17, which is arranged on the tank bottom structure in the bottom pump well peripheral area of a self-contained super-low temperature liquid tank, and comprises two sub-portions symmetrically arranged about the central axis plane of the submerged pump 1, wherein the central axis of the submerged pump 1 is in the central axis plane of the submerged pump 1, and each sub-portion of the submerged pump base comprises:

[0051] an upper support 2, one end of which is fixedly connected with the head flange of the submerged pump 1 to fix the head of the submerged pump 1 through the upper support 2;

[0052] a main support 3, which is vertically force-bearing and is a main support force-bearing portion, the upper end of the main support 3 is fixedly connected with the other end of the upper support 2 through a top plate 11, and the lower end of the main support 3 is fixedly connected with the tank bottom structure through a bottom plate 12;

[0053] a box-shaped clamping tongue 7, which is fixedly arranged in the middle area of the submerged pump 1 (for example, the box-shaped clamping tongue 7 is fixedly arranged in the vertical middle area of the submerged pump 1);

[0054] a sliding support 4, which is fixedly arranged on the back plate 9 (for example, the plate opposite to the submerged pump 1) of the main support 3, and the back plate 9 is provided with an opening corresponding to the box-shaped clamping tongue 7, the middle portion of the sliding support 4 is fixedly provided with a first sliding block 81 opposite to the box-shaped clamping tongue 7, and the side of the sliding support 4 facing the box-shaped clamping tongue 7 is provided with two side wing plates 15 for clamping the box-shaped clamping tongue 7, and each side wing plate 15 is fixedly provided with a second sliding block 82 on the side facing the box-shaped clamping tongue 7, so as to hold the box-shaped clamping tongue 7 through three surfaces of the sliding support 4, thereby limiting the three surfaces of the box-shaped clamping tongue 7, and the first sliding block 81 and the second sliding block 82 are kept in slight contact with the three surfaces of the box-shaped clamping tongue 7 through the first sliding block 81, the second sliding block 82 and the sliding block stop plate 6 installed on the sliding support 4. It can be understood that the first sliding block 81 and the second sliding block 82 are respectively in contact with the box-shaped clamping tongue 7 without abutting, so as to limit the free end of the submerged pump 1 in the horizontal direction together with the sliding support 4, and effectively release the displacement difference between the pump body of the submerged pump 1 and the submerged pump base due to thermal expansion and contraction, so as to effectively support the large submerged pump 1 and ensure the stable operation of the large submerged pump 1, and the installation and disassembly of the device are also relatively convenient.

[0055] In some embodiments of the present disclosure, the upper support 2 is provided with a circular arc shape at one end edge thereof facing the submerged pump 1, and is adapted to the curvature of the head flange of the submerged pump 1. The upper support 2 is provided with a rectangular shape at one end thereof fixedly connected to the top plate 11, that is, for example, the normal right-angled edges can be provided, or can be provided with rounded corners or chamfers.

[0056] A plurality of circular holes are formed on the edge of the one end of the upper support 2 provided with the circular arc shape, and are distributed in a circular arc shape and correspondingly arranged with the bolt holes on the head flange, so as to be fixedly connected with the head flange by the fixing bolts.

[0057] A plurality of waist-round bolt holes and circular jacking bolt holes are formed on the edge of the one end of the upper support 2 provided with the rectangular shape, and are correspondingly arranged with the bolt holes on the top plate 11. The circular jacking bolt hole is used to install the jacking bolt, and the waist-round bolt hole is used to install the fixing bolt to fixedly connect the upper support 2 with the top plate 11.

[0058] The adjusting pad 5 is located between the upper support 2 and the main support 3. The adjusting pad 5 is provided with a circular bolt hole and a single-side horseshoe-shaped opening to avoid the jacking bolt. The adjusting pad 5 can be divided into multiple pieces according to the size of the upper support 2. The thickness of the adjusting pad 5 can be determined and reprocessed according to the actual situation of the site assembly, so as to adjust the installation flatness of the submerged pump 1 and compensate for the assembly gap between the submerged pump 1 and the upper pump pipe.

[0059] In the present embodiment, the main support 3 specifically includes a back plate 9, a support elbow plate 10, a top plate 11, a bottom plate 12, and a reinforcing rib plate 13 for local reinforcement (the number of the reinforcing rib plate 13 can be one or more, which is not limited in the present specification) to form a strong support structure. The main support 3 further includes two support elbow plates 10 (for example, two support elbow plates arranged on both sides) arranged between the top plate 11 and the bottom plate 12, and fixedly connected with the top plate 11, the bottom plate 12 and the back plate 9. The two support elbow plates 10 are respectively located at both ends of the back plate 9, and the size and spacing of the support elbow plates 10 can be flexibly adjusted according to the actual structure type of the tank bottom.

[0060] The back plate 9 is further provided with the reinforcing rib plate 13 for reinforcing and fixing the support elbow plate 10 and the top plate 11. The reinforcing rib plate 13 includes a transverse reinforcing rib and a longitudinal reinforcing rib, and plays a role of auxiliary reinforcing the vertical and lateral strength of the main support 3.

[0061] In the present embodiment, the opening on the back plate 9 can pass through the two side wing plates 15, and the back plate 9 is provided with a circular bolt hole at the edge of the opening for fixedly installing the sliding support 4.

[0062] The sliding bracket back plate 14 is rectangular, and two ends of the sliding bracket back plate 14 are provided with waist round bolt holes for fixed connection with the back plate 9 of the main bracket 3, and the middle part of the sliding bracket back plate 14 is provided with two rows of slot holes arranged side by side for mounting the first sliding block 81 and the sliding block stop plate 6.

[0063] The sliding bracket back plate 14 is provided with a sliding bracket reinforcing rib plate 16 for reinforcement and fixation.

[0064] Further, in the embodiment, the side wing plate 15 is provided with slot holes for mounting the second sliding block 82 and the sliding block stop plate 6, and one second sliding block 82 and the sliding block stop plate 6 for fixing the second sliding block 82 are mounted on each side wing plate 15.

[0065] The sliding bracket reinforcing rib plate 16 includes a horizontal rib plate, a vertical rib plate and a triangular plate. The horizontal rib plate and the vertical rib plate are used to strengthen the strength of the sliding bracket back plate 14. The triangular plate is used to strengthen the strength of the side wing plate 15 of the sliding bracket 4, that is, the triangular plate plays a role of auxiliary strengthening of the side wing plate 15 of the sliding bracket 4.

[0066] In the embodiment, the materials of the first sliding block 81 and the second sliding block 82 are both polytetrafluoroethylene, and the cross-sectional area of the part of the first sliding block 81 and the second sliding block 82 that can be in contact with the box-shaped latch 7 and is clamped on the sliding bracket 4 is smaller than the cross-sectional area of the end of the first sliding block 81 and the second sliding block 82 away from the box-shaped latch 7, so that the first sliding block 81 can be embedded in the slot hole on the sliding bracket back plate 14, and the second sliding block 82 can be embedded in the slot hole of the side wing plate 15. Specifically, it can be understood that the non-contact end face of the sliding block is larger than the contact end face with the box-shaped latch 7, for example, by one circle, so as to pass through and be embedded into the corresponding slot hole on the sliding bracket 4. As shown in FIG. 17, the sliding block stop plate 6 can be a square plate with bolt holes opened in four corners, for example, for being fixed on the sliding bracket 4, and plays a role of abutting against the non-contact end face of the first sliding block 81 or the second sliding block 82 to prevent it from loosening outward.

[0067] The thickness of the first sliding block 81 and the second sliding block 82 is polished and adjusted based on the assembly size between the sliding bracket 4, the main bracket 3 and the immersed liquid pump 1. That is, the thickness of the sliding block 8 can be polished and adjusted according to the actual assembly condition, so as to ensure that the sliding block 8 and the box-shaped latch 7 after installation maintain slight contact.

[0068] In the embodiment, the box-shaped latch 7 is a hollow rectangular box as a whole, and the back surface of the box-shaped latch 7 is provided with a bolt hole for fixation with the seat plate in the middle part of the immersed liquid pump 1, so as to be fixedly connected with the immersed liquid pump 1 through the bolt inserted in the bolt hole.

[0069] When the immersed liquid pump base in the ultra-low temperature liquid tank is installed, the installation process is as follows:

[0070] First, the relevant parts of the main support 3 are processed according to the design drawing, and the relevant parts are assembled and welded at the corresponding position of the bottom of the liquid tank; then the relevant parts of the sliding support 4 are processed and assembled and welded into the sliding support 4; then the upper support 2, the adjusting pad 5, the sliding block stop plate 6, the sliding block 8 and the box-shaped clamping tongue 7 are processed.

[0071] After all the parts are made, when the submersible pump 1 is hoisted to the upper side of the main support 3, the upper support 2 is bolted to the flange ring of the pump body of the submersible pump 1; then pre-positioning is performed, the height is adjusted by the jacking bolt, the actual thickness required by the adjusting pad 5 is measured and reprocessed; the processed adjusting pad 5 is placed on the top plate 11 of the main support 3; the upper support 2 and the adjusting pad 5 are connected and fixed with the main support 3 by bolts.

[0072] Then the box-shaped clamping tongue 7 is bolted to the middle position seat plate of the submersible pump 1; then the sliding support 4 is bolted to the back plate 9 of the main support 3; the gap values between the sliding support back plate 14, the side wing plate 15 of the sliding support 4 and the three faces of the box-shaped clamping tongue 7 are measured respectively, and the thickness of the corresponding sliding block 8 is polished and adjusted according to the gap values; then the polished sliding block is embedded into the corresponding slot hole on the sliding support 4 so that the sliding block 8 slightly contacts the three faces of the box-shaped clamping tongue 7. Then the sliding block stop plate 6 is bolted to the sliding support 4 so that the sliding block 8 cannot be loosened outward. Finally, the nuts of all the bolt connections are spot-welded to strengthen the fixation of the bolts and prevent loosening. Thus, the base installation is completed.

[0073] As known from the above technical solution, the submersible pump base in the ultra-low temperature liquid tank provided by the above embodiment of the present disclosure can fix the head of the submersible pump 1 by the upper support 2, support the force by the main support 3 as the main support, limit the free end of the submersible pump 1 in the horizontal direction by the sliding support 4, the sliding block 8 and the box-shaped clamping tongue 7, and effectively release the thermal expansion and contraction displacement difference between the pump body and the base by vertical sliding, thereby effectively supporting the large submersible pump 1 and ensuring its stable operation; further, the structure of the above base is not complex, and is convenient to make, can effectively support the large submersible pump 1 and ensure its stable operation, and can be conveniently installed and disassembled; and the main structure of the base does not need to be changed too much, only the connection parts of the local and the pump body need to be simply designed and modified to be applicable to submersible pumps 1 of different sizes and types, and only the distance of the local components of the main support 3 needs to be adaptively adjusted to be applicable to different structure types of the bottom of the liquid tank, and the applicability and universality of the base are very excellent.

[0074] The above examples are only exemplary embodiments of the present disclosure, and are not intended to limit the present disclosure, and the protection scope of the present disclosure is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present disclosure within the spirit and protection scope of the present disclosure, and such modifications or equivalent replacements are also considered to fall within the protection scope of the present disclosure.

Claims

1. A submersible pump base for a cryogenic liquid tank, characterized in that: The submersible pump base is arranged on the bilge frame in the peripheral area of ​​the bottom pump well of the independent ultra-low temperature liquid tank, and includes two sub-parts arranged symmetrically about the central axis of the submersible pump. Each sub-part of the submersible pump base includes: An upper bracket, one end of which is fixedly connected to the head flange of the submersible pump; The main body bracket is located below the upper bracket and is used to bear vertical loads. The upper end of the main body bracket is fixedly connected to the other end of the upper bracket through a top plate, and the lower end of the main body bracket is fixedly connected to the bottom frame through a bottom plate. a box-shaped latch, the box-shaped latch being fixedly disposed in a central region of the submersible pump; and The sliding bracket is fixed on the back plate of the main body bracket, and the back plate is provided with an opening corresponding to the box-shaped tongue. A first slider is fixedly provided at the middle of the sliding bracket opposite to the box-shaped tongue. The sliding bracket is provided with two side wing plates for clamping the box-shaped tongue on the side facing the box-shaped tongue. Each of the side wing plates is fixed with a second slider on the side facing the box-shaped tongue, wherein the first slider and the second slider are in contact with the box-shaped tongue without abutting against each other, so as to limit the free end below the submersible pump in the horizontal direction, and effectively release the displacement difference between the submersible pump body and the submersible pump base due to thermal expansion and contraction through vertical sliding.

2. The submersible pump base for use in a cryogenic liquid tank according to claim 1, characterized in that: The upper bracket is arranged in an arc shape at one end facing the submersible pump and is adapted to the curvature of the head flange of the submersible pump. The upper bracket is arranged in a rectangular shape at one end fixedly connected to the top plate. A plurality of circular holes distributed in an arc shape and arranged corresponding to the bolt holes on the head flange are opened on the edge of one end of the upper bracket in an arc shape, so as to fix the upper bracket and the head flange with fixing bolts; and The edge of one end of the upper bracket is arranged in a rectangular shape, and a plurality of waist-shaped bolt holes and circular jacking bolt holes are arranged at intervals and corresponding to the bolt holes on the top plate. The circular jacking bolt holes are used to install jacking bolts, and the waist-shaped bolt holes are used to install fixing bolts to fix the upper bracket to the adjustment pad and the top plate.

3. The submersible pump base for use in a cryogenic liquid tank according to claim 1, characterized in that: The main frame further includes two supporting elbow plates, which are arranged between the top plate and the bottom plate and fixedly connected to the top plate, the bottom plate and the back plate at the same time, and the two supporting elbow plates are respectively located at both ends of the back plate; and The back plate is further provided with reinforcing ribs for reinforcing and fixing the supporting elbow plate and the top plate, and the reinforcing ribs include transverse reinforcing ribs and longitudinal reinforcing ribs.

4. The submersible pump base for use in a cryogenic liquid tank according to claim 1, characterized in that: The opening on the back plate is capable of allowing the two side wing plates to pass through, and the back plate is provided with a circular bolt hole at the edge of the opening for fixing and installing the sliding bracket; The back plate of the sliding bracket is rectangular, and has waist-shaped round bolt holes at both ends for fixed connection with the back plate of the main bracket. The middle of the back plate of the sliding bracket has two rows of slots arranged side by side for mounting the first slider and the slider stop plate; and A reinforcing rib is provided on the back plate of the sliding bracket for strengthening and fixing.

5. The submersible pump base for use in a cryogenic liquid tank according to claim 4, characterized in that: The side wing plates are provided with slots for mounting the second slider and the slider stopper plate, and each of the side wing plates is mounted with a second slider and a slider stopper plate for fixing the second slider; and The reinforcing ribs of the sliding bracket include transverse ribs, vertical ribs and triangular plates. The transverse ribs and vertical ribs are used to strengthen the strength of the back plate of the sliding bracket, and the triangular plates are used to strengthen the strength of the side wing plates of the sliding bracket.

6. The submersible pump base for use in a cryogenic liquid tank according to claim 5, characterized in that: The first slider and the second slider are both made of polytetrafluoroethylene, and the cross-sectional areas of the first slider and the second slider at the portion where they can engage with the box-shaped latch and are latched on the sliding bracket are smaller than the cross-sectional areas of the ends of the first slider and the second slider away from the box-shaped latch, so that the first slider can be embedded in the slot on the back plate of the sliding bracket, and the second slider can be embedded in the slot on the side wing plate. as well as The thickness of the first sliding block and the second sliding block are polished and adjusted based on the assembly dimensions between the sliding bracket, the main body bracket and the submersible pump.

7. The submersible pump base for use in a cryogenic liquid tank according to claim 1, characterized in that: The box-shaped tongue is in the shape of a hollow rectangular box as a whole. A bolt hole is provided on the back of the box-shaped tongue for fixing to the seat plate in the middle of the submersible pump, so that the box-shaped tongue is fixedly connected to the submersible pump by a bolt passing through the bolt hole.

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