Replaceable partition plate type double-runner sand mixing centrifugal pump volute structure

Abstract

The invention discloses a volute structure of a replaceable partition plate type double-flow-channel sand mixing centrifugal pump. A flange mounting edge of a left volute and a flange mounting edge of a right volute are correspondingly arranged into buckling structures which are matched and attached to each other, and the left volute and the right volute are fixed into a whole through the buckling structures; a sealing belt clamping groove is formed in the flange mounting edge of the left volute or the right volute, and a sealing belt is mounted in the sealing belt clamping groove; symmetrical partition plate mounting grooves are correspondingly formed in the inner surfaces of the left volute and the right volute; and a partition plate is inserted between the partition plate mounting groove in the left volute and the partition plate mounting groove in the right volute. The invention belongs to the technical field of oil field fracturing mechanical equipment, a volute shell and a partition plate of a flow channel are separately designed, the partition plates with different hardness and strength are used according to different operations, the partition plates are independently replaced, the service life of a centrifugal pump is prolonged, and the equipment cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil field fracturing machinery and equipment, and relates to a replaceable partition plate type double-flow channel sand mixing centrifugal pump volute structure. BACKGROUND

[0002] At present, the double-flow channel partition of the volute of a large-capacity sand mixing centrifugal pump is realized by using a fixed partition plate formed by integral casting. The partition plate is located in the middle of the flow channel of the volute and is relatively close to the impeller. Therefore, the movement speed of particles impacting the partition plate position is relatively large, the volume loss of the partition plate is relatively serious compared with other positions of the volute, and the partition plate is the main wear position in the volute. The wear of the partition plate causes it to lose the function of balancing the radial fluid force in the pump, resulting in an increase in random vibration and vibration amplitude of the centrifugal pump. At the same time, the volume loss of the partition plate allows more high-speed particles to impact the volute body, causing more serious wear of the external structure of the volute, and resulting in a substantial decrease in the hydraulic characteristics of the centrifugal pump. The serious wear of the partition plate in the centrifugal pump greatly reduces the service life of the centrifugal pump and increases the difficulty of repairing the centrifugal pump. SUMMARY

[0003] The purpose of the present application is to provide a replaceable partition plate type double-flow channel sand mixing centrifugal pump volute structure, which solves the problem of easy serious wear of the fixed partition plate of the centrifugal pump in the prior art, greatly reducing the service life of the centrifugal pump.

[0004] The technical solution adopted by the present application is a replaceable partition plate type double-flow channel sand mixing centrifugal pump volute structure, which comprises a left volute and a right volute. The flange mounting edges of the left volute and the right volute are correspondingly provided as a butt joint structure that tightly fits with each other. The butt joint structure fixes the left volute and the right volute as a whole. A sealing strip clamping groove is formed in the flange mounting edge of the left volute or the right volute, and a sealing strip is installed in the sealing strip clamping groove.

[0005] Symmetrical partition plate mounting grooves are formed in the inner surfaces of the left volute and the right volute. A partition plate is clamped between the partition plate mounting grooves in the left volute and the right volute.

[0006] The replaceable partition plate type double-flow channel sand mixing centrifugal pump volute structure of the present application is characterized in that:

[0007] The left volute and the right volute are symmetrical in shape and are butt jointed together.

[0008] The flange mounting edges of the left volute and the right volute are simultaneously provided with a circle of bolt mounting holes that are in alignment. The butt joint structure fixes and connects the left volute and the right volute as a whole by means of a plurality of bolts.

[0009] The two side end faces of the partition plate are provided with steps. The partition plate is clamped in the partition plate mounting grooves of the left volute and the right volute through the steps of the two side end faces.

[0010] The slot depth of the partition plate mounting slot is greater than the length of the step of the end face of the partition plate.

[0011] The partition plate is pre-plated.

[0012] The running direction of the sealing band clamping slot is arranged along the flange mounting edge of the left volute and the flange mounting edge of the right volute.

[0013] The beneficial effects of the present application are that the volute shell and the partition plate of the flow channel are designed separately, connected by flanges, the left volute and the right volute have a buckling structure and are connected by bolts, which can be disassembled in time; different hardness and strength partition plates can be used for replacement according to different operations; the centrifugal pump can be replaced in time when the external characteristics of the centrifugal pump are reduced due to wear, thereby improving the service life of the centrifugal pump. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a cross-sectional view of the assembled state of the device of the present application;

[0015] Figure 2 is an elevation view of the left volute along the flange mounting edge in the device of the present application;

[0016] Figure 3 is a step diagram of the partition plate in the device of the present application;

[0017] Figure 4 is a schematic view of the use state of the device of the present application;

[0018] Figure 5 is Figure 4 the right side view in

[0019] Figure 6 is Figure 4 the top view in

[0020] In the figure, 1. left volute, 2. right volute, 3. partition plate, 4. sealing band, 5. bolt, 21. volute flange, 22. partition plate mounting slot, 23. sealing band clamping slot, 31. step. DETAILED DESCRIPTION

[0021] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0022] Referring to Figure 1 , Figure 2The structure of the present application comprises a left volute 1 and a right volute 2, the shapes of the left volute 1 and the right volute 2 are symmetrical and buckled together, the flange mounting edges of the left volute 1 and the right volute 2 are correspondingly provided as buckling structures 21 that are tightly buckled together, the flange mounting edges of the left volute 1 and the right volute 2 are simultaneously provided with a circle of bolt mounting holes that are in alignment, the buckling structures 21 fix and connect the left volute 1 and the right volute 2 into an integrated whole through a plurality of bolts 5, a sealing band clamping groove 23 is formed in the flange mounting edge of the left volute 1 or the right volute 2, the sealing band clamping groove 23 is provided along the whole flange mounting edge, and a sealing band 4 is mounted in the sealing band clamping groove 23.

[0023] Referring to Figure 2 , Figure 3 Corresponding symmetrical partition plate mounting grooves 22 are formed in the inner surfaces of the left volute 1 and the right volute 2, a partition plate 3 is clamped between the partition plate mounting grooves 22 in the left volute 1 and the right volute 2, the two side end faces of the partition plate 3 are provided with steps 31, and the partition plate 3 is clamped in the partition plate mounting grooves 22 of the left volute 1 and the right volute 2 through the steps 31 of the two side end faces. The depth of the partition plate mounting groove 22 is greater than the length of the two side steps 31 of the partition plate 3, so that the left volute 1 and the right volute 2 can clamp the partition plate 3 together, and the left volute 1, the right volute 2 and the partition plate 3 can be fixed firmly after being tightened by the bolts 5, while the sealing end faces of the shell buckling structures 21 of the left volute 1 and the right volute 2 are tightly clamped against each other, the sealing band 4 is compacted, and the pressure sealing performance of the whole volute is ensured.

[0024] The partition plate 3 is plated with tungsten carbide or other materials to improve the wear resistance and thus the service life of the centrifugal pump volute.

[0025] The working principle of the present application is that the left volute 1 and the right volute 2 are fastened by the bolts 5, the partition plate 3 is clamped and fixed in the middle of the volute through the groove structure, and the inner cavity of the volute is divided into two flow passages. The sealing band clamping groove 23 is formed in the left volute 1 or the right volute 2 for mounting the sealing band 4 to meet the pressure sealing requirements of the centrifugal pump volute. The partition plate mounting grooves 22 are formed in the inner walls of the left volute 1 and the right volute 2 for cooperating with the steps 31 on the two sides of the partition plate 3, and the inner partition plate 3 can be fixed and clamped after the left volute 1 and the right volute 2 are fastened by the bolts. The step shape of the two sides of the partition plate 3 cooperates with the structure of the left volute 1 and the right volute 2, and can be fixed in the interior of the volute under the clamping of the left volute 1 and the right volute 2.

[0026] In the fracturing operation, when the fracturing fluid containing a large number of proppant particles flows out from the impeller into the volute, the volute partition plate 3 closest to the impeller position is subjected to the impact of high-speed particles for a long time, and the wear is more serious than other areas of the volute. The present application divides the large displacement centrifugal pump volute into left volute 1 and right volute 2, installs the partition plate 3 as an independent replaceable component in the left volute 1 and the right volute 2, clamps the partition plate 3 in the centrifugal pump volute through bolt fastening, and divides the volute flow passage. The contact surface between the left volute 1 and the right volute 2 is sealed by the sealing band 4 to ensure the sealing ability of the volute under pressure. By designing the partition plate 3 which is most susceptible to particle impact as a replaceable component, different materials or shapes of partition plate 3 can be installed according to different particle substances and fracturing operations, so as to adapt to the working requirements in different environments and minimize the wear caused by particle impact.

[0027] Example 1

[0028] The structure of the present application is that the flange mounting edge of the left volute 1 and the flange mounting edge of the right volute 2 are arranged as a butt joint structure 21 which tightly matches with each other, the butt joint structure 21 fixes and buckles the left volute 1 and the right volute 2 as a whole through a plurality of bolts 5, a sealing band clamping groove 23 is opened in the flange mounting edge of the left volute 1 or the right volute 2, and the sealing band 4 is installed in the sealing band clamping groove 23, the partition plate mounting groove 22 is correspondingly prearranged in the left volute 1 and the right volute 2, the partition plate 3 is installed between the partition plate mounting groove 22 of the left volute 1 and the partition plate mounting groove 22 of the right volute 2, the both side end faces of the partition plate 3 are provided with steps 31 which are clamped in the partition plate mounting groove 22 of the left volute 1 and the right volute 2. The partition plate 3 is plated with tungsten carbide material.

[0029] As shown in Figure 4 , Figure 5 , Figure 6 , the left volute 1 and the right volute 2 in the device of the present application position the partition plate 3 at the outlet of the centrifugal pump through the partition plate mounting groove 22. Through this structure, after the centrifugal pump pumps the liquid containing sand particles, the partition plate 3 is at the discharge port, the liquid enters from A, and after being pressurized by the rotation of the centrifugal pump blade, the liquid is discharged from B through the volute.

[0030] After 1500 hours of use, the surface of the partition plate 3 in the device of the present application has slight wear, which is equivalent to the wear condition of the existing technology of normal welding integral volute.

[0031] Example 2

[0032] Similarly, the structure installation mode of example 1 is adopted.

[0033] As shown in Figure 4 , Figure 5 , Figure 6As shown, in the device of the present invention, the left volute 1 and the right volute 2 are positioned at the centrifugal pump outlet by the partition plate mounting groove 22. With this structure, after the centrifugal pump pumps the liquid containing sand particles, the partition plate 3 is at the discharge outlet. The liquid enters from A, is pressurized by the rotation of the centrifugal pump blades, and is discharged from B through the volute.

[0034] After 2000 hours of use, the partition plate 3 in the device of the present invention experienced accelerated wear, and the output pressure and displacement of the centrifugal pump decreased. At this time, the wear condition of the replaceable structure of the device of the present invention was consistent with that of the integrated welded structure of the prior art.

[0035] Example 3

[0036] Similarly, the installation method is the same as in Example 1.

[0037] like Figure 4 , Figure 5 , Figure 6 As shown, in the device of the present invention, the left volute 1 and the right volute 2 are positioned at the centrifugal pump outlet by the partition plate mounting groove 22. With this structure, after the centrifugal pump pumps the liquid containing sand particles, the partition plate 3 is at the discharge outlet. The liquid enters from A, is pressurized by the rotation of the centrifugal pump blades, and is discharged from B through the volute.

[0038] After 2500 hours of use, the partition plate 3 has worn more severely, and the centrifugal pump's output pressure and displacement can no longer meet the requirements. The existing one-piece welded structure requires replacing the entire volute. However, the structure of this invention only requires replacing the partition plate 3. If the replaced partition plate 3 is re-treated with tungsten carbide plating based on usage conditions and reused, the operating and maintenance costs will be even lower.

Claims

1. A replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure, characterized in that: Includes a left volute (1) and a right volute (2). The flange mounting edges of the left volute (1) and the right volute (2) are respectively set as interlocking structures (21) that fit together tightly. The interlocking structures (21) fix the left volute (1) and the right volute (2) into one piece. A sealing strip groove (23) is opened in the flange mounting edge of the left volute (1) or the right volute (2), and a sealing strip (4) is installed in the sealing strip groove (23). Symmetrical partition plate mounting slots (22) are opened on the inner surfaces of the left volute (1) and the right volute (2), and a partition plate (3) is inserted between the partition plate mounting slot (22) in the left volute (1) and the partition plate mounting slot (22) in the right volute (2).

2. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 1, characterized in that: The left volute (1) and the right volute (2) are symmetrical in shape and fit together.

3. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 1, characterized in that: The flange mounting edge of the left volute (1) and the flange mounting edge of the right volute (2) are both provided with a ring of matching bolt mounting holes. The snap-fit ​​structure (21) uses multiple bolts (5) to fix the left volute (1) and the right volute (2) into one unit.

4. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 1, characterized in that: The partition plate (3) has steps (31) on both sides of its end face. The partition plate (3) is fitted into the partition plate mounting groove (22) of the left volute (1) and the right volute (2) by the steps (31) on both sides of its end face.

5. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 4, characterized in that: The groove depth of the partition plate mounting groove (22) is greater than the length of the steps (31) on both sides of the partition plate (3).

6. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 1, characterized in that: The partition plate (3) is pre-coated.

7. The replaceable partition plate type dual-channel sand mixing centrifugal pump volute structure according to claim 1, characterized in that: The sealing strip groove (23) is set along the flange mounting edge of the left volute (1) and the flange mounting edge of the right volute (2) throughout the entire length.

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