Double-barrel multi-stage centrifugal pump with twist lock structure

Abstract

The utility model discloses a double-barrel multi-stage centrifugal pump with twist lock structures, which relates to the technical field of centrifugal pumps, and comprises a centrifugal pump main body with barrels, a pump cover matched with the ends of the barrels and a fastener, the inner wall of a barrel opening of each barrel is provided with a stopping convex part in a protruding manner, and the outer circumference of each pump cover is provided with a limiting block. And the limiting block can move along the axial direction of the barrel along with the pump cover and is inserted into the inner side of the end part of the barrel, and the limiting block crosses the stopping convex part and rotates along the axis of the barrel. Through the arrangement of the limiting block on the pump cover and the stopping convex part on the cylinder body, the limiting block and the stopping convex part are matched to form the twist lock structure, the pump cover and the cylinder body can be conveniently and rapidly assembled in a pre-positioning mode through the twist lock structure, the locking effect is good, and the requirement for bearing medium pressure in the centrifugal pump body can be met; and meanwhile, complicated tools such as a hydraulic wrench are not needed.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a double-cylinder multistage centrifugal pump with a torsion lock structure. Background Technology

[0002] Twin-bore multistage centrifugal pumps are widely used in industries such as petrochemicals and coal chemicals. Due to their twin-bore structure, they can withstand high pressures. To withstand the high pressure inside the cylinder, the conventional design uses a combination of bolts and gaskets to connect the pump cover to the cylinder. However, this structure generally requires a large torque to pre-tighten the bolts to meet the pressure requirements of the medium inside the cylinder and the sealing force. Typically, a hydraulic wrench is used to install and remove the bolts between the pump cover and the cylinder.

[0003] A search revealed that CN217327822U discloses a centrifugal pump with a convenient pump cover for easy assembly and disassembly. The centrifugal pump includes a pump body and a pump cover. An installation groove is formed on the side surface of the pump body, and the pump cover is installed inside the installation groove. An installation handle is provided in the center of the pump cover surface. Fixing grooves are formed around the pump cover surface, and a fixing plate is movably installed within the fixing grooves. A connecting rod is provided on the back of the fixing plate, and one end of the connecting rod is installed inside the centrifugal pump body with a connecting plate. Engaging posts are connected to both sides of the connecting plate surface. A communicating cavity is formed around the installation groove inside the centrifugal pump body, and one end of the communicating cavity is connected to the installation cavity. A limit baffle is installed on one side of the inner wall of the installation cavity, and two fixing slots are formed on the other side of the inner wall of the installation cavity.

[0004] When using the aforementioned centrifugal pump, the limiting baffle is connected to the inner wall of the mounting cavity via a return spring, and the locking pin is engaged and fixedly connected with the fixing slot. To disassemble the pump cover from the mounting slot, press the fixing plate until the return spring is pressed to the designated position, then rotate it to align the locking pin with the engaging slot, allowing the pump cover to be removed using the installation handle. Although disassembly of the centrifugal pump does not require the use of hydraulic wrenches or other tools, the pump cover's locking effect is poor due to the disassembly and assembly structure, limiting its pressure resistance. This makes it unable to meet the pressure requirements of the medium within the centrifugal pump body, thus restricting its application.

[0005] To address this issue, we propose a dual-cylinder multistage centrifugal pump with a torsion lock structure to solve the problems in the existing technology. Utility Model Content

[0006] The purpose of this utility model is to solve the problems in the prior art by proposing a double-cylinder multi-stage centrifugal pump with a torsion lock structure. The torsion lock structure is formed by the cooperation of the limiting block and the stop protrusion. The pump cover and the cylinder can be pre-positioned and assembled in a convenient manner with good locking effect, without the need for complicated tools such as hydraulic wrenches.

[0007] To solve the above problems, this utility model provides the following technical solution:

[0008] A dual-cylinder multistage centrifugal pump with a torsion lock structure includes a centrifugal pump body with a cylinder, a pump cover adapted to the end of the cylinder, and fasteners. The inner wall of the cylinder opening is provided with a stop protrusion. The outer circumference of the pump cover is provided with a limit block. The limit block can move along the cylinder axis with the pump cover and be inserted into the inner side of the end of the cylinder. When the limit block passes the stop protrusion and rotates along the cylinder axis until the projection of the limit block and the stop protrusion along the cylinder axis coincides, the fasteners can lock the limit block and the stop protrusion.

[0009] As a further embodiment of this utility model: the limiting blocks are configured as multiple blocks and arranged in an array along the circumference of the pump cover, and the stop protrusions are configured as multiple blocks and arranged in an array along the inner side of the end of the cylinder, forming a positioning area between any two adjacent stop protrusions through which the limiting blocks can pass.

[0010] As a further embodiment of this utility model: the inner wall of the cylinder opening is provided with an annular protrusion, and the annular protrusion is coaxially arranged with the cylinder. During the process of the limiting block being inserted into the inner side of the end of the cylinder, the annular protrusion is used to block the limiting block so that the limiting block in this state can rotate until the projection of the limiting block and the stop protrusion on the axial direction of the cylinder coincides, and the part of the limiting block and the end face of the stop protrusion are in a fitted state.

[0011] As a further embodiment of this utility model: the fastener includes a fastening bolt, and threaded holes are provided on both the limiting block and the stop protrusion. When the projections of the limiting block and the stop protrusion on the axial direction of the cylinder coincide, the fastening bolt is threaded onto the two threaded holes.

[0012] As a further embodiment of this utility model, it also includes two operating rods arranged radially along the pump cover, and both operating rods can be detachably installed on the pump cover.

[0013] As a further embodiment of this utility model: one end of the operating rod is configured as a threaded end, and an assembly hole for mounting the threaded end is provided on the outer circumference of the pump cover.

[0014] As a further aspect of this utility model, it also includes a sealing ring disposed between the end of the cylinder and the pump cover for sealing the two.

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

[0016] 1. By setting the upper limit block on the pump cover and the stop protrusion on the cylinder, the limit block and the stop protrusion cooperate to form a torsion lock structure. The torsion lock structure can be used to conveniently pre-position the pump cover and the cylinder, with good locking effect, which can meet the requirements of bearing the pressure of the medium inside the centrifugal pump body, and at the same time, there is no need to use complicated tools such as hydraulic wrenches.

[0017] 2. By setting multiple limiting blocks and stop protrusions, after the pump cover and cylinder are assembled, the multiple limiting blocks are staggered with the multiple stop protrusions respectively. That is, the multiple limiting blocks and the multiple stop protrusions can generate axial pressing force. The multiple axial pressing forces are distributed around the cylinder end, so that the cylinder is subjected to uniform force.

[0018] 3. By setting the annular protrusion, during the process of inserting the limiting block on the pump cover into the cylinder opening, the presence of the annular protrusion can block and limit the limiting block that has reached the designated position, so that after the limiting block rotates in this state, it can fit tightly with the end face of the stop protrusion, which better facilitates the generation of axial pressure force between the two.

[0019] 4. With the two operating levers, when it is necessary to drive the pump cover to rotate, the operator can hold the two operating levers with both hands respectively, and then use both hands to drive the pump cover to rotate the corresponding angle. This process is simple and labor-saving. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall cylindrical structure in this utility model. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the overall cylindrical structure in this utility model. Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the overall structure of the pump cover in this utility model;

[0025] Figure 5 This is a schematic diagram of the assembly structure of the cylinder and pump cover of this utility model. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the assembly structure of the cylinder and pump cover of this utility model. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the assembly structure of the cylinder and pump cover of this utility model. Figure 3 .

[0028] In the diagram: 1. Centrifugal pump body; 101. Cylinder; 2. Pump cover; 3. Stop protrusion; 4. Limit block; 5. Annular protrusion; 6. Threaded hole; 7. Operating rod; 8. Fastening bolt. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1-7 As shown, a dual-cylinder multistage centrifugal pump with a torsion lock structure includes a centrifugal pump body 1 with a cylinder 101, a pump cover 2 adapted to the end of the cylinder 101, and fasteners. After the cylinder 101 and the pump cover 2 are assembled, they can be locked using the fasteners. Specifically, for the assembly between the pump cover 2 and the cylinder 101, a stop protrusion 3 is provided on the inner wall of the cylinder opening of the cylinder 101, and a limit block 4 is provided on the outer circumference of the pump cover 2. The limit block 4 can move along the axial direction of the cylinder 101 with the pump cover 2 and be inserted into the inner side of the end of the cylinder 101. When the limit block 4 passes the stop protrusion 3 and rotates along the axis of the cylinder 101 until the projections of the limit block 4 and the stop protrusion 3 along the axial direction of the cylinder 101 coincide, the fasteners can lock the limit block 4 and the stop protrusion 3 in this state.

[0031] In the aforementioned locked state, the limiting block 4 on the pump cover 2 and the stop protrusion 3 on the cylinder 101 are in close contact, forming a torsion lock structure. Simultaneously, they generate a counter-pressure force in the axial direction of the cylinder 101. Furthermore, when the centrifugal pump body 1 is operating, the locking force between the pump cover 2 and the cylinder 101 consists of two types: one is the axial counter-pressure force between the limiting block 4 and the stop protrusion 3, and the other is the locking connection force applied by the fasteners between the pump cover 2 and the cylinder 101. Under the combined action of these two forces, the pump cover 2 can be tightly installed on the cylinder 101, meeting the pressure requirements of the medium inside the centrifugal pump body 1 and ensuring a long service life.

[0032] like Figures 5-7As shown, in order to ensure that the axial pressing force between the limiting block 4 and the stop protrusion 3 is evenly distributed around the end of the cylinder 101, multiple limiting blocks 4 can be arranged in a circumferential array along the pump cover 2, and multiple stop protrusions 3 can be arranged in a circumferential array on the inner side of the end of the cylinder 101, forming a positioning area between any two adjacent stop protrusions 3 through which the limiting block 4 can pass. Figure 5 In the indicated state, the multiple limiting blocks 4 are respectively matched with the corresponding positioning areas. At this time, the pump cover 2 can be moved further toward the end of the cylinder 101 until the multiple limiting blocks 4 are respectively inserted into the corresponding positioning areas, that is... Figure 6 As shown in the diagram, the pump cover 2 is then rotated, causing the multiple limiting blocks 4 to be misaligned with the multiple stop protrusions 3. This means that axial pressure can be generated between the multiple limiting blocks 4 and the multiple stop protrusions 3. This state can be achieved by... Figure 7 To express.

[0033] like Figures 2-3 As shown, during the process of inserting the multiple limiting blocks 4 into the corresponding positioning areas, in order to ensure that the limiting blocks 4 are inserted at the designated positions at the ends of the cylinder 101, an annular protrusion 5 can be provided on the inner wall of the cylinder opening of the cylinder 101. The annular protrusion 5 is coaxially arranged with the cylinder 101. The annular protrusion 5 can block the multiple limiting blocks 4 after they are inserted into the corresponding positions at the ends of the cylinder 101. That is, during the process of inserting the limiting blocks 4 into the inner side of the ends of the cylinder 101, the annular protrusion 5 is used to block the limiting blocks 4, so that the limiting blocks 4 in this state can rotate until the projections of the limiting blocks 4 and the stop protrusion 3 on the axial direction of the cylinder 101 coincide. At this point, the part of the limiting blocks 4 in contact with the end faces of the stop protrusion 3 is in a fitted state, and this contact part can generate a pressing force along the axial direction of the cylinder 101.

[0034] like Figures 6-7 As shown, the fasteners described above include a fastening bolt 8, a limiting block 4, and a stop protrusion 3, all of which have threaded holes 6. When the projections of the limiting block 4 and the stop protrusion 3 in the axial direction of the cylinder 101 coincide, the fastening bolt 8 is threaded onto the two threaded holes 6, allowing the pump cover 2 to be threadedly locked to the cylinder 101. It should be noted that the fasteners are not limited to the fastening bolt 8; other conventional techniques in the prior art can also be used, as long as they achieve the locking connection between the pump cover 2 and the cylinder 101.

[0035] like Figures 4-7As shown, in the process of driving the pump cover 2 to rotate, to make the process convenient and labor-saving, this embodiment also includes two operating rods 7 arranged radially along the pump cover 2, and both operating rods 7 are detachably mounted on the pump cover 2. When it is necessary to drive the pump cover 2 to rotate, the operator can hold the two operating rods 7 with both hands respectively, and then drive the pump cover 2 to rotate the corresponding angle. This process is simple and labor-saving. After the rotation is completed, the two operating rods 7 can be detached. Specifically, for the detachable connection between the operating rods 7 and the pump cover 2, one end of the operating rod 7 can be set as a threaded end, and the outer circumference of the pump cover 2 is provided with an assembly hole for mounting the threaded end.

[0036] During the installation of the pump cover 2 and the cylinder 101, in order to ensure a good seal between the pump cover 2 and the cylinder 101, a sealing component can be provided between the end of the cylinder 101 and the pump cover 2. The sealing component can be a sealing ring or its derivatives in the prior art.

[0037] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A double-cylinder multistage centrifugal pump with a torsion lock structure, characterized in that, The pump body (1) includes a centrifugal pump body (101) with a cylinder (101), a pump cover (2) adapted to the end of the cylinder (101), and fasteners. A stop protrusion (3) is provided on the inner wall of the cylinder opening of the cylinder (101). A limit block (4) is provided on the outer circumference of the pump cover (2). The limit block (4) can move along the axial direction of the cylinder (101) with the pump cover (2) and be inserted into the inner side of the end of the cylinder (101). When the limit block (4) passes over the stop protrusion (3) and rotates along the axis of the cylinder (101) until the projection of the limit block (4) and the stop protrusion (3) along the axial direction of the cylinder (101) coincides, the fasteners can lock the limit block (4) and the stop protrusion (3).

2. The double-cylinder multistage centrifugal pump with torsion lock structure according to claim 1, characterized in that, The limiting blocks (4) are configured in multiple ways and arranged in a circumferential array along the pump cover (2). The stop protrusions (3) are configured in multiple ways and arranged in a circumferential array on the inner side of the end of the cylinder (101). A positioning area is formed between any two adjacent stop protrusions (3) through which the limiting blocks (4) can pass.

3. A double-cylinder multistage centrifugal pump with a torsion lock structure according to claim 2, characterized in that, The inner wall of the cylinder (101) is provided with an annular protrusion (5), and the annular protrusion (5) is coaxially arranged with the cylinder (101). During the process of inserting the limiting block (4) into the inner side of the end of the cylinder (101), the annular protrusion (5) is used to block the limiting block (4) so ​​that the limiting block (4) in this state can rotate until the projection of the limiting block (4) and the stop protrusion (3) on the axial direction of the cylinder (101) coincides. At this time, the part of the end face of the limiting block (4) and the stop protrusion (3) in contact is in a close fit state.

4. A double-cylinder multistage centrifugal pump with a torsion lock structure according to any one of claims 1-3, characterized in that, The fasteners include fastening bolts (8), and threaded holes (6) are provided on both the limiting block (4) and the stop protrusion (3). When the projections of the limiting block (4) and the stop protrusion (3) on the axial direction of the cylinder (101) coincide, the fastening bolts (8) are threaded onto the two threaded holes (6).

5. A double-cylinder multistage centrifugal pump with a torsion lock structure according to claim 4, characterized in that, It also includes two operating rods (7) arranged radially along the pump cover (2), and both operating rods (7) can be detachably installed on the pump cover (2).

6. A double-cylinder multistage centrifugal pump with a torsion lock structure according to claim 5, characterized in that, One end of the operating rod (7) is set as a threaded end, and the outer circumference of the pump cover (2) is provided with an assembly hole for the threaded end to be installed.

7. A double-cylinder multistage centrifugal pump with a torsion lock structure according to any one of claims 1-3, characterized in that, It also includes a sealing ring disposed between the end of the cylinder (101) and the pump cover (2) for sealing the two.

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