Corrosion-resistant submersible centrifugal pump guide shell pressing device

Abstract

The utility model relates to the field of centrifugal pump assembly, and discloses an anti-corrosion submersible centrifugal pump guide shell pressing device which comprises a pressing pipe pushing mechanism and a locking ring tightening tool, the pressing pipe pushing mechanism is provided with a pushing end which is used for stretching into a pump shell and a tightening ring and pushing the end face of a pressing pipe, and the locking ring tightening tool is used for tightening the end face of the pressing pipe. The locking ring tightening tool comprises a torque tube used for stretching into an annular space between the pump shell and the pushing mechanism, and the front end of the torque tube is provided with a concave-convex matching structure used for being matched with the locking ring. Compared with the existing pressing device for the guide shell of the submersible centrifugal pump, the pressing device for the guide shell of the submersible centrifugal pump solves the problem that the pressing device in the prior art is inconvenient to operate when a locking ring is screwed.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump assembly field especially relates to anticorrosive submersible centrifugal pump guide shell compression device. BACKGROUND

[0002] The submersible centrifugal pump is of a guide shell and impeller multistage series structure, the impeller is multistage series and is fixed on the shaft by a key, and the guide shell is between the pump shell and the impeller. When the centrifugal pump works, the impeller rotates at high speed, and the guide shell generates a torque opposite to the direction of the impeller, so it is necessary to keep the guide shell and the pump shell axially fixed, which requires applying a large enough axial pressure to the guide shell when installing the guide shell into the pump shell, and making the guide shell set produce a compression amount along the axial direction to be fixed. The pre-tightening force of the guide wheel of the submersible centrifugal pump directly affects the assembly quality. If the compression amount is not enough, and affected by external factors underground, the gap between the guide shells increases during the operation of the submersible centrifugal pump, which aggravates the vibration of the unit, and further leads to the premature failure of the unit. If the compression amount is too large, the guide wheel is damaged such as cracking during the assembly process.

[0003] As shown in the conventional submersible centrifugal pump, Figure 1 The pump shell 3 and the pump head 1 are generally made of high-quality carbon alloy steel, and the thread strength is high. The compression method of the conventional submersible centrifugal pump is to directly use the connecting thread between the pump head 1 and the pump shell 3, and manually tighten the pump head 1 with a pipe wrench. After the pump head 1 is tightened, the compression pipe 2 is pushed and compressed. The compression pipe 2 compresses the guide shell 4 in the centrifugal pump shell. The pump head and the shell of the anticorrosive submersible centrifugal pump are made of stainless steel, and the thread strength is far from reaching the strength of the thread of the conventional submersible centrifugal pump. If the anticorrosive submersible centrifugal pump directly uses the thread of the stainless steel pump head and pump shell to compress the guide shell, the thread is easily stuck under the action of a large compression force, which causes the stainless steel pump head and shell to be scrapped.

[0004] The utility model discloses a kind of pre-pressing devices of electric submersible pump guide wheel, the device includes tightening tool, hydraulic piston and compression nut, single-flow valve is installed on compression nut, single-flow valve is connected with hydraulic pump.High-pressure oil provided by hydraulic pump enters annular cylinder in hydraulic compression nut by high-pressure hose, hydraulic piston is pushed to travel, until the pressure is sequentially transmitted to compression pipe and guide wheel, so as to realize the pre-pressing of guide wheel, and it is prevented that compression force is unloaded by rotating locking ring of tightening tool, with its right end face against compression pipe.It has solved the problem of sticking of stainless steel submersible centrifugal pump shell and pump head, but the disadvantage is that its compression device realizes the pre-pressing of compression pipe by hydraulic pump, single-flow valve, high-pressure hose, hydraulic compression nut, annular cylinder, hydraulic piston cooperation, and the pull rod of tightening tool is respectively passed through the opening slot of hydraulic piston and locking ring to realize the tightening of locking ring, and the device is complex;When locking ring is tightened, the pull rod is limited by the opening slot of hydraulic piston, and hydraulic piston and annular cylinder are connected on pump shell by thread, so that the rotation angle of tightening tool is limited, the pull rod is rotated, and the operation steps are complicated;And the feed amount of hydraulic piston in oil cylinder cannot be accurately measured, so that the compression amount of guide wheel cannot be accurately determined. Utility model content

[0005] The utility model discloses a kind of pre-pressing devices of electric submersible centrifugal pump guide shell, solve the problem of inconvenient operation of the compression device of prior art when rotating locking ring.

[0006] To achieve the above object, the utility model provides a kind of technical scheme of anticorrosive electric submersible centrifugal pump guide shell compression device:

[0007] A kind of anticorrosive electric submersible centrifugal pump guide shell compression device, including compression pipe pushing mechanism and locking ring tightening tool, the compression pipe pushing mechanism has the pushing end for being inserted into to pump shell and locking ring and the end surface of compression pipe is pushed, the locking ring tightening tool includes the torsion pipe for being inserted into to annulus between pump shell and pushing mechanism, the front end of torsion pipe has the concave-convex cooperation structure for cooperating with locking ring.

[0008] Further, the compression pipe pushing mechanism includes jack and force transmission pipe, the front end of force transmission pipe constitutes the pushing end.

[0009] Further, the jack is mechanical screw jack.

[0010] Further, the force transmission pipe is straight pipe with constant outer diameter.

[0011] Further, the torsion pipe and the force transmission pipe are gap fit.

[0012] Further, the convex or concave structure of the front end of the torsion tube is a convex head or a concave groove.

[0013] Further, the convex head or concave groove of the front end of the torsion tube is rectangular.

[0014] Further, the convex or concave structure of the front end of the torsion tube is provided with two or more, and is uniformly arranged along the circumference of the torsion tube.

[0015] Further, the rear end of the torsion tube is fixedly connected with a screw handle.

[0016] Further, the screw handle is symmetrically arranged along the pipe axis direction.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] The utility model discloses a kind of anticorrosive submersible centrifugal pump guide shell compression devices, compared with the prior art, the locking ring tightening tool and locking ring are directly matched by concave-convex structure, without the pull rod structure in the prior art, so structure is simpler.The pushing end of push mechanism is directly contacted with compression pipe, and the pressure is transmitted to make guide shell compression, and the torsion tube of locking ring tightening tool is in the annulus between pump shell and push mechanism, when locking ring is tightened, the limitation of piston opening slot to pull rod in prior art is not present, and the rotation angle is larger, and it is more convenient to operate. DRAWINGS

[0019] Figure 1 It is: the sectional view of pump head and pump shell in prior art submersible centrifugal pump;

[0020] Figure 2 It is: the structure schematic view of anticorrosive submersible centrifugal pump guide shell compression device when using;

[0021] Figure 3 It is: the back view of locking ring of anticorrosive submersible centrifugal pump;

[0022] Figure 4 It is: the left view of locking ring of anticorrosive submersible centrifugal pump.

[0023] Figure 1 In it: 1, pump head;2, compression pipe;3, pump shell;4, guide shell.

[0024] Figures 2-4 In it: 1, compression pipe pushing mechanism;11, mechanical screw jack;12, force transmission pipe;3, locking ring tightening tool;31, screw handle;32, torsion tube;4, locking ring;5, compression pipe;6, pump shaft;7, pump shell;8, guide shell. DETAILED DESCRIPTION

[0025] The features and performance of the present application will be further described in detail below in conjunction with embodiments. It should be noted that the descriptions of these embodiments are used to help understand the present application and do not constitute a limitation of the present application. In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] The utility model relates to a kind of anticorrosive submersible centrifugal pump guide shell compression devices, including the pushing mechanism of compression pipe and locking ring tightening tool, the pushing mechanism of compression pipe has for being inserted into the end of pump shell and locking ring and the end surface of compression pipe is pushed and pushed, the locking ring tightening tool includes the torque tube for being inserted into the annulus between pump shell and pushing mechanism, the front end of torque tube has the concave-convex cooperation structure for cooperating with locking ring.

[0027] When using, the pushing end of the pushing mechanism of compression pipe directly acts on the compression pipe, the compression pipe transmits pressure to guide shell to pre-press guide shell, and then the locking ring tightening tool is rotated, and torque is transmitted through torque tube until locking ring is tightened, so that the right end surface of locking ring abuts against compression pipe to prevent compression force from being unloaded. The reaction force of guide shell first acts on the pushing end of the pushing mechanism of compression pipe, so that the outer thread of locking ring does not stick with the internal thread of pump shell during locking ring is tightened in place.

[0028] Based on the above main idea, different embodiments are provided below for illustration.

[0029] As shown in Figure 2 A more basic embodiment of the anticorrosive submersible centrifugal pump guide wheel shell compression device includes a compression pipe pushing mechanism 1 and a locking ring tightening tool 3, the compression pipe pushing mechanism 1 has a pushing end for being inserted into the pump shell 7 and the locking ring 4 and pushing the end surface of the compression pipe 5, the locking ring tightening tool 3 includes a torque tube 32 inserted into the annulus between the pump shell and the compression pipe pushing mechanism 1, the front end of the torque tube 32 has a concave-convex cooperation structure for cooperating with the locking ring 4, and the rear end of the torque tube 32 has a screw handle 31.

[0030] Based on the above embodiment, in one embodiment, as Figure 2As shown, the pressing pipe pushing mechanism 1 comprises a jack and a force transmission pipe 12, the front end of the force transmission pipe 12 is the pushing end of the pressing pipe pushing mechanism 1, the other end of the pressing pipe pushing mechanism 1 is the jack, the front end of the force transmission rod 2 passes through the pump shaft 6 and extends into the locking ring tightening tool 3 and the locking ring 4, and acts on the pressing pipe 5. In operation, the jack first transmits pressure to the force transmission rod 2, and the force transmission rod 2 then transmits the pressure to the pressing pipe 5 and the guide shell 8 in turn to achieve pre-pressing of the guide shell 8. In other embodiments, the force transmission pipe 12 and the jack are integrated, that is, the front end of the jack directly extends into the locking ring tightening tool 3 and the locking ring 4 through the pump shaft 6, and directly acts on the end face of the pressing pipe 5 to transmit the pressing force to the pressing pipe 5 and then to the guide shell 8 to achieve pressing of the guide shell 8.

[0031] Preferably, the force transmission pipe 12 is a straight pipe with a constant outer diameter, which is convenient to obtain and convenient to extend into the locking ring tightening tool 3 and the locking ring 4. On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figure 2 As shown, the torsion pipe 32 is in clearance fit with the force transmission pipe 12, so that when the torsion pipe 32 rotates, the force transmission pipe 12 can constrain the rotation axis of the torsion pipe 32 to some extent, facilitating the rotation of the torsion pipe 32.

[0032] Since the compression amount of the guide shell 8 directly affects the working efficiency of the centrifugal pump itself, it is necessary to accurately measure the compression amount. To solve this problem, a jack that can directly and accurately obtain the compression amount is selected. On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figure 2 As shown, the jack of the pressing pipe pushing mechanism 1 is a mechanical screw jack 11, which can calculate the feed amount of the mechanical screw jack 11 by observing the thread feed amount during use. When the guide shell 8 needs to be pressed, the mechanical screw jack 11 applies pressure to the bottom of the force transmission rod 2, and then transmits the pressure to the pressing pipe 5 and the guide shell 8 in turn. At this time, the feed amount of the mechanical screw jack 11 is the compression amount of the guide shell 8. By rotating the mechanical screw jack 11, the guide shell 8 obtains a proper compression amount and pressing force. While providing an axial force, it prevents the gap between the guide shells 8 from increasing and the vibration of the unit from being aggravated when the compression amount is too small. It also prevents damage problems such as cracking of the guide shell 8 during assembly when the compression amount is too large. In other embodiments, the jack of the pressing pipe pushing mechanism 1 is a hydraulic jack, and a photoelectric sensor is mounted on the hydraulic rod of the output cylinder of the hydraulic jack. The compression amount of the guide shell 8 is determined by measuring the feed amount of the hydraulic rod by the photoelectric sensor.

[0033] The locking ring 4 is used to prevent the pressure of the compression pipe 5 from being unloaded after the compression pipe pushing mechanism 1 applies pressure to the compression pipe 5 for pre-compression. The locking ring 4 needs to be tightened by the locking ring tightening tool 3, and the cooperation between the two will affect the tightening efficiency of the locking ring 4 and the subsequent compression work. Therefore, the convex-concave cooperation structure at the front end of the torque tube 32 varies due to the different structures of the locking ring 4. When the structure of the locking ring 4 is as shown in Figures 3-4 , that is, the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with a slot, the convex-concave cooperation structure at the front end of the torque tube 32 is a convex head. In other cases, when the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with a convex head, the convex-concave cooperation structure at the front end of the torque tube 32 is a groove matched with the convex head. On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 2-4 , the front end of the torque tube 32 of the locking ring tightening tool 3 is provided with a convex head, which is used to cooperate with the slot on the circumferential surface of the locking ring 4 away from the compression pipe 5 as shown in Figure 4 , so as to realize the cooperation between the locking ring tightening tool 3 and the locking ring 4. In other embodiments, the front end of the torque tube 32 of the locking ring tightening tool 3 is a groove, and the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with a convex head. Through the cooperation between the groove and the convex head, the cooperation between the locking ring tightening tool 3 and the locking ring 4 is realized.

[0034] The shape and number of the convex-concave cooperation structure at the front end of the torque tube 32 will affect the cooperation between the locking ring 4 and the locking ring tightening tool 3. On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 2-4 , the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with four uniformly and symmetrically distributed rectangular grooves, and the circumferential surface of the front end of the torque tube 32 is provided with four uniformly and symmetrically distributed rectangular convexes. The convexes have the same size as the grooves, and the grooves and the convexes are symmetrically arranged, so that the cooperation between the locking ring 4 and the locking ring tightening tool 3 is more stable, and the torque is better transmitted. In other embodiments, the front end of the torque tube 32 is provided with two symmetrically distributed rectangular convexes, and the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with two uniformly and symmetrically distributed rectangular grooves. In another embodiment, the front end of the torque tube is provided with three symmetrically distributed rectangular convexes, and the circumferential surface of the locking ring 4 away from the compression pipe 5 is provided with three uniformly and symmetrically distributed rectangular grooves. In other embodiments, the front end of the torque tube 32 is a rectangular groove, and the circumferential surface of the locking ring 4 away from the compression pipe 5 is a rectangular convex. The number of the convexes can be set to 2, 3 or 4, and they are uniformly and symmetrically arranged along the circumferential surface. In other embodiments, the convex-concave structure at the front end of the torque tube 32 is cylindrical, and the convex or groove on the circumferential surface of the locking ring 4 away from the compression pipe 5 is also cylindrical. The convex-concave structure and the convex or groove on the locking ring 4 are both arranged more than two on the circumferential surface.

[0035] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figure 2 When the locking ring 4 needs to be tightened, the rotating handle is rotated to rotate the locking ring tightening tool 3, and the torque is transmitted to the locking ring 4 through the torsion tube 32, so that the locking ring 4 is screwed with the pump shell 7 to achieve tightening. When the locking ring 4 needs to be loosened, the rotating handle 31 can be rotated in the opposite direction, so that the locking ring 4 is unscrewed. Because the locking ring tightening tool 3 is coaxially arranged with the locking ring 4, and the protrusion is matched with the groove hole, the locking ring special tool 3 can rotate 360° around the pump shaft, and the tightening of the locking ring 4 is achieved.

[0036] When the guide shell 8 needs to be compressed, as shown in Figure 2 The mechanical screw jack 11 pushes the transmission rod 12 forward, and the pressure is transmitted to the compression pipe 5 and the guide shell 8 through the transmission rod 12, so that the guide shell 8 is pre-compressed. At this time, the rotating handle 31 on the locking ring tightening tool 3 is rotated again, and the torque is transmitted to the locking ring 4 through the cooperation of the groove hole and the protrusion, so that the outer thread of the locking ring 4 is matched with the inner thread of the pump shell 7 to be tightened. At this time, the locking ring 4 can be extracted from the mechanical screw jack 11 and the transmission rod 12, and only the locking ring 4 can be used to apply pressure to the compression pipe 5. Because the locking ring 4 is not subjected to the reaction force from the compression pipe 5 when it is tightened, there is no axial thrust, so the problem of sticking of the stainless steel locking ring 4 and the pump shell 7 during assembly is avoided. The compression amount of the guide shell 8 is accurately obtained by measuring the feeding amount of the mechanical screw jack.

[0037] The above-mentioned is only a preferred embodiment of the present application, and does not limit the present application. The patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the contents of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A corrosion-resistant submersible centrifugal pump guide casing clamping device, characterized in that, The device includes a pressing tube pushing mechanism and a locking ring tightening tool. The pressing tube pushing mechanism has a pushing end for extending into the pump housing and the locking ring to push the end face of the pressing tube. The locking ring tightening tool includes a torque tube for extending into the annular space between the pump housing and the pushing mechanism. The front end of the torque tube has a concave-convex fit structure for engaging with the locking ring.

2. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 1, characterized in that, The pressing tube jacking mechanism includes a jack and a force transmission tube, with the front end of the force transmission tube forming the jacking end.

3. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 2, characterized in that, The jack is a mechanical screw jack.

4. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 2, characterized in that, The force transmission tube is a straight tube with a constant outer diameter.

5. The anti-corrosion submersible centrifugal pump guide casing clamping device according to any one of claims 2-4, characterized in that, The torque tube and the force transmission tube are fitted with a clearance.

6. The anti-corrosion submersible centrifugal pump guide casing clamping device according to any one of claims 1-4, characterized in that, The concave-convex fitting structure at the front end of the torque tube is a protrusion or a groove.

7. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 6, characterized in that, The protrusion or groove at the front end of the torque tube is rectangular.

8. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 7, characterized in that, The front end of the torsion tube has two or more concave-convex mating structures, which are evenly arranged along the circumference of the torsion tube.

9. The anti-corrosion submersible centrifugal pump guide shell clamping device according to claim 1, characterized in that, A screw-on handle is fixedly connected to the rear end of the torque tube.

10. A corrosion-resistant submersible centrifugal pump guide casing clamping device according to claim 9, characterized in that, The screw handles are symmetrically arranged along the tube axis.

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