Slurry pump capable of preventing impeller from falling off due to reverse rotation

Abstract

The present application provides a kind of anti-impeller reverse sloughing of slurry pump, it is related to slurry pump field;It includes pump shaft and impeller, also includes being equipped on pump shaft base, and respectively being equipped on base driving element, at least two limit plates and at least two limit rods;Wherein, two first wedge surfaces are equipped on driving element, and driving element can slide along the axial direction of pump shaft;Each limit plate can slide along the radial direction of pump shaft, and two limit plates are respectively equipped with second wedge surface that is attached with corresponding first wedge surface;When impeller is rotationally installed on pump shaft, impeller can push driving element to slide along the axial direction of pump shaft, the sliding of driving element pushes two limit plates to slide along the radial direction of pump shaft, and each limit rod is respectively equipped on impeller and can be connected with corresponding limit plate or be separated;The anti-impeller reverse sloughing of slurry pump of the present application can avoid impeller from falling off from pump shaft when impeller reverses unexpectedly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry pump, in particular to a slurry pump capable of preventing impeller from falling off due to reverse rotation. BACKGROUND

[0002] Slurry pump refers to a centrifugal pump for conveying liquid containing suspended particles, which is widely used in mining, power, metallurgy, coal, environmental protection and other industries for conveying slurry containing solid particles, such as slurry conveying in metallurgical ore dressing plant, hydraulic ash removal in thermal power plant, coal slurry and heavy medium conveying in coal washing plant, dredging river, river dredging and the like.

[0003] When the slurry pump is working, the pump shaft is driven to rotate by the motor, and the impeller is driven to rotate by the pump shaft to complete the conveying of the slurry. In the prior art, the pump shaft and the impeller are connected by threads, that is, an external thread is arranged on the pump shaft, and a threaded hole capable of being screwed with the external thread is arranged on the impeller. By screwing the impeller and the pump shaft together, when the pump shaft rotates in the forward direction, the pump shaft rotates in the direction of screwing with the impeller, which makes the connection between the pump shaft and the impeller more and more tight.

[0004] However, the existing slurry pump has the following defects: when the staff inadvertently reverses the connection of the motor, the pump shaft will rotate in the reverse direction. Since the impeller is heavy and has a large inertia, the reverse rotation of the pump shaft cannot drive the impeller to rotate, which will cause the impeller to fall off from the pump shaft, resulting in the need to disassemble and repair the slurry pump. SUMMARY

[0005] Therefore, the present application provides a slurry pump capable of preventing the impeller from falling off from the pump shaft when the pump shaft reverses.

[0006] The technical scheme of the present application is as follows:

[0007] A slurry pump capable of preventing the impeller from falling off due to reverse rotation, comprising a pump shaft and an impeller, an external thread is arranged on the pump shaft, a first threaded hole capable of being screwed with the external thread is arranged on the impeller, a limiting hole located on the inner side of the first threaded hole is arranged on the impeller, and the inner diameter of the limiting hole is greater than the inner diameter of the first threaded hole; and the slurry pump further comprises:

[0008] a base fixed on the end face of the pump shaft;

[0009] a driving member arranged on the base and capable of sliding along the axial direction of the pump shaft, two first wedge surfaces are arranged on the driving member; a first elastic member is arranged between the driving member and the base, and the first elastic member applies a pushing force to the driving member to make the driving member move away from the pump shaft;

[0010] At least two limiting plates are arranged on the base and can slide along the radial direction of the pump shaft, and two second wedge surfaces are arranged on the two limiting plates respectively and are matched with the corresponding first wedge surfaces. When the impeller is mounted on the pump shaft and rotates, the bottom surface of the limiting hole can push the driving element to slide along the axial direction of the pump shaft, and the sliding of the driving element pushes the two limiting plates to slide along the radial direction of the pump shaft, so that the limiting plates protrude from the outer side surface of the pump shaft and extend into the limiting hole.

[0011] At least two limiting rods are arranged on the impeller, and the two limiting rods can be separated from or combined with the corresponding limiting plates.

[0012] Further, a center hole coaxial with the pump shaft is arranged on the base, the driving element comprises a guide rod slidably arranged in the center hole, a pushing block fixed on the end of the guide rod, and a bearing pushing rod fixed on the side of the pushing block away from the pump shaft, and the two first wedge surfaces are arranged on the two sides of the pushing block respectively.

[0013] Further, the first elastic element is a spring, the spring is sleeved on the guide rod, and the spring abuts between the base and the pushing block.

[0014] Further, two guide grooves are arranged on the base respectively on the two opposite sides of the center hole, and the two limiting plates are slidably arranged in the corresponding guide grooves respectively; and a second elastic element is arranged between each limiting plate and the base, and the second elastic element applies an elastic force to the limiting plate to make the limiting plate close to the center of the base.

[0015] Further, two guide portions are arranged on the base, and the two guide grooves are arranged on the two guide portions correspondingly; each guide portion comprises two "L"-shaped guide blocks, and the two guide blocks enclose the "T"-shaped guide groove.

[0016] Further, the limiting plate comprises a bottom plate which can slide in the wide diameter section of the guide groove, and a process block fixed on the bottom plate, and the process block can slide in the narrow diameter section of the guide groove; the second wedge surface is arranged on the process block.

[0017] Further, a long slot is arranged on each limiting plate respectively, and the center line of the long slot is an arc concentric with the pump shaft; the limiting rod is screwed with the impeller, and when the limiting rod is combined with the corresponding limiting plate, the limiting rod is inserted into the long slot on the limiting plate.

[0018] Further, two second threaded holes are formed on the impeller, and the limiting rods are threaded rods screwed with the second threaded holes.

[0019] Further, a square-shaped mounting hole is formed on the end of the pump shaft, and the base comprises a mounting disc and a fixing block fixed on the mounting disc and capable of being inserted into the mounting hole.

[0020] The working principle and advantages of the present application are as follows:

[0021] The slurry pump provided by the present application can prevent the impeller from being reversed and falling off by setting two limiting plates capable of being expanded by the impeller and two limiting rods fixed on the impeller. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0023] Figure 1 The explosion view of the impeller and the pump shaft cooperation provided by the present application;

[0024] Figure 2 The cross-sectional view of the impeller and the pump shaft cooperation provided by the present application;

[0025] Figure 3 The explosion view of the impeller and the base cooperation provided by the present application;

[0026] Figure 4 The explosion view of the base and the limiting plate cooperation provided by the present application;

[0027] Figure 5 The position schematic diagram of the knocking piece and the process block before collision provided by the present application;

[0028] Figure 6 The position schematic diagram of the knocking piece and the process block in collision provided by the present application;

[0029] Figure 7 The position schematic diagram of the knocking piece and the process block after collision provided by the present application;

[0030] In the figure: 100, pump shaft; 101, mounting hole; 200, impeller; 210, limiting rod; 201, first threaded hole; 202, limiting hole; 300, base; 310, second elastic member; 301, guide groove; 320, first elastic member; 400, driving member; 410, guide rod; 420, pushing block; 430, bearing pushing rod; 401, first wedge surface; 500, limiting plate; 510, bottom plate; 520, process block; 501, second wedge surface; 502, long hole; 600, one-way bearing; 610, base; 620, knocking member; 601, groove. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The present application provides a slag slurry pump capable of preventing impeller reverse rotation and falling, referring to Figure 1 and Figure 2 , which comprises a pump shaft 100 and an impeller 200. Wherein, the pump shaft 100 is provided with external threads, and the impeller 200 is provided with a first threaded hole 201 capable of being screwed with the external threads; and the impeller 200 is provided with a limiting hole 202 located inside the first threaded hole 201, and the inner diameter of the limiting hole 202 is greater than the inner diameter of the first threaded hole 201.

[0033] Referring to Figures 1 to 4 , the slag slurry pump of the present embodiment further comprises a base 300, a driving member 400, at least two limiting plates 500 and at least two limiting rods 210. Wherein, the base 300 is fixedly arranged on the end face of the pump shaft 100. The driving member 400 is arranged on the base 300 and can slide along the axial direction of the pump shaft 100, and the driving member 400 is provided with two first wedge surfaces 401. A first elastic member 320 is arranged between the driving member 400 and the base 300, and the first elastic member 320 applies a pushing force to the driving member 400 to make the driving member 400 away from the pump shaft 100.

[0034] Referring to Figure 3 and Figure 4As shown, each limiting plate 500 is arranged on the base 300 and can slide along the radial direction of the pump shaft 100, and each of the two limiting plates 500 is provided with a second wedge surface 501 which is in contact with the corresponding first wedge surface 401; when the impeller 200 is installed on the pump shaft 100, the bottom surface of the limiting hole 202 can push the driving member 400 to move along the axial direction of the pump shaft 100, and the movement of the driving member 400 will push the two limiting plates 500 to slide along the radial direction of the pump shaft 100, so that each limiting plate 500 protrudes from the outer side surface of the pump shaft 100 and extends into the limiting hole 202. Each limiting rod 210 is arranged on the impeller 200 and corresponds to each limiting plate 500, and each limiting rod 210 can be separated from or combined with the corresponding limiting plate 500.

[0035] Based on the overall structure described above, before installation, each limiting plate 500 of the slurry pump of the present embodiment is lower than the outer side surface of the pump shaft 100, so as not to affect the installation of the impeller 200 on the pump shaft 100. When the impeller 200 rotates on the pump shaft 100 for a distance and continues to rotate, the impeller 200 will push the driving member 400 to move along the axial direction of the pump shaft 100, and the movement of the driving member 400 along the axial direction of the pump shaft 100 will drive each limiting plate 500 to extend outward along the radial direction of the pump shaft 100 through the transmission of the first wedge surface 401 and the second wedge surface 501, and when each limiting plate 500 extends, the two limiting rods 210 can be combined with the limiting plate 500. Thereafter, when the pump shaft 100 reverses rotation accidentally, the pump shaft 100 will drive the impeller 200 to reverse rotation through the limiting plate 500 and the limiting rod 210, so as to avoid the impeller 200 from falling off the pump shaft 100.

[0036] A preferred structure is as shown in Figure 3 The end of the pump shaft 100 is fixedly provided with a square mounting hole 101. The base 300 of the present embodiment includes a mounting disc and a fixing block which is fixedly arranged on the mounting disc and can be inserted into the mounting hole 101. By arranging the mounting hole 101 and the fixing block, the torque can be transmitted between the pump shaft 100 and the base 300. It should be noted that the mounting disc of the present embodiment is fixedly connected with the base 300 by a bolt pair. Since it does not affect the understanding, the bolt pair is not shown in the drawings of the present embodiment.

[0037] Referring to Figure 3 and Figure 4As shown, in the embodiment, a center hole coaxial with the pump shaft 100 is formed on the base 300, the driving member 400 of the embodiment includes a guide rod 410 slidably arranged in the center hole, a pushing block 420 fixed on the end of the guide rod 410, and a bearing pushing rod 430 fixed on the side of the pushing block 420 away from the pump shaft 100; two first wedge surfaces 401 are respectively formed on the two sides of the pushing block 420. The first elastic member 320 is a first spring sleeved on the guide rod 410, one end of the first spring is in abutment with the base 300, and the other end is in abutment with the pushing block 420.

[0038] It should be noted that the pushing block 420 can also be arranged in a T shape, so as to arrange three first wedge surfaces 401, at this time, the limiting plate 500 and the limiting rod 210 are also correspondingly three. The pushing block 420 can also be arranged in a cross shape, so as to arrange four first wedge surfaces 401, at this time, the limiting plate 500 and the limiting rod 210 are also correspondingly four. They have the same principle, which will not be described here.

[0039] In the embodiment, referring to Figure 3 and Figure 4 As shown, two guide grooves 301 are arranged on the base 300 and specifically on the mounting disc and located on the two opposite sides of the center hole, the two limiting plates 500 are respectively arranged in the corresponding guide grooves 301 in a guided and slidable manner, and the second elastic member 310 is arranged between each limiting plate 500 and the base 300, and the second elastic member 310 applies an elastic force to the limiting plate 500 to make the limiting plate 500 close to the center of the base 300. Specifically, in the embodiment, the second elastic member 310 is a second spring in abutment between the limiting plate 500 and the base 300, and through the second spring, the limiting plate 500 is pushed to reset by the second spring when the impeller 200 is removed from the pump shaft 100, so as to avoid that the limiting plate 500 blocks the impeller 200.

[0040] The base 300 is fixed with two guide portions, the two guide grooves 301 are correspondingly arranged on the two guide portions, and each guide portion includes two guide blocks in an L shape, and the two guide blocks enclose the guide groove 301 in a T shape. The guide groove 301 includes a wide diameter section close to the base 300 and a narrow diameter section away from the base 300.

[0041] Referring to Figure 3 and Figure 4 As shown, the limiting plate 500 of the embodiment includes a bottom plate 510 capable of sliding in the wide diameter section of the guide groove 301, and a process block 520 fixed on the bottom plate 510, and the process block 520 is capable of sliding in the narrow diameter section of the guide groove 301, and the second wedge surface 501 is specifically formed on the process block 520.

[0042] Based on the above structure, the specific installation process of the impeller 200 in the embodiment is as follows:

[0043] In the initial state, each limiting plate 500 is retracted below the outer side surface of the pump shaft 100, at this time, the impeller 200 can be normally screwed onto the pump shaft 100;

[0044] When the impeller 200 is installed on the pump shaft 100:

[0045] First stroke: the impeller 200 is normally screwed on the pump shaft 100 until the bottom surface of the limiting hole 202 abuts against the outer side surface of the bearing thrust rod 430;

[0046] Second stroke: the impeller 200 continues to be screwed on the pump shaft 100, the impeller 200 pushes the bearing thrust rod 430, the driving part 400 moves along the axial direction of the pump shaft 100; the movement of the driving part 400 drives the limiting plate 500 to move outward along the radial direction of the pump shaft 100 through the transmission of the first wedge surface 401 and the second wedge surface 501; the limiting plate 500 is extended, which facilitates the combination of the limiting plate 500 and the limiting rod 210.

[0047] In the embodiment, as shown in Figure 4 , a long hole 502 is formed on each limiting plate 500, and the center line of the long hole 502 is an arc concentric with the pump shaft 100. In the embodiment, two second threaded holes are formed on the impeller 200, and the two limiting rods 210 are corresponding threaded rods screwed with the two second threaded holes; after the impeller 200 is installed in place and the limiting plate 500 is extended, the two limiting rods 210 can be screwed on the impeller 200 and arranged in the corresponding long hole 502.

[0048] By arranging the long hole 502, on the one hand, the limiting rod 210 can be easily arranged in the corresponding long hole 502, which facilitates the installation of the slurry pump; on the other hand, by arranging the long hole 502, the limiting rod 210 has a certain rotation allowance in the long hole 502, which does not affect the screwing of the pump shaft 100 and the impeller 200 when the pump shaft 100 rotates in the forward direction; when the pump shaft 100 accidentally rotates in the reverse direction, the limiting rod 210 will be blocked by the side wall of the long hole 502, so that the impeller 200 rotates synchronously with the pump shaft 100, avoiding the impeller 200 from falling off the pump shaft 100.

[0049] In some embodiments, as shown in Figures 4 to 7 , a one-way bearing 600 is fixedly arranged on the bearing thrust rod 430, a base 610 is arranged on the one-way bearing 600, a groove 601 is arranged on the end surface of the base 610, a knocking part 620 is hinged on the bottom surface of the groove 601, and the free end of the knocking part 620 exceeds the outer side surface of the base 610.

[0050] In the embodiment, when the thrust rod 430 rotates with the pump shaft 100 in the forward direction, the base 610 and the knocking member 620 will be driven to rotate by the pump shaft 100, i.e. the base 610 and the knocking member 620 rotate synchronously with the pump shaft 100, and the knocking member 620 will not produce a sound. When the pump shaft 100 rotates in the reverse direction by accident, the pump shaft 100 will not drive the base 610 to rotate, i.e. the rotation of the base 610 is asynchronous with the rotation of the pump shaft 100. At this time, as shown in Figures 5 to 7 the base 300 will collide with the free end of the knocking member 620, causing an abnormal sound. After the process block 520 drives the knocking member 620 to rotate for a certain distance, the knocking member 620 will be separated from the process block 520, until the knocking member 620 collides with the process block 520 again, and so on. This will continuously produce an abnormal sound, so as to remind the worker that the pump shaft 100 is rotating in the reverse direction, and to stop the maintenance.

[0051] In summary, the slurry pump of the embodiment only needs to add the base 300, the driving member 400, the limiting plates 500 and the limiting rods 210 on the impeller 200 on the basis of the existing slurry pump. When the pump shaft 100 rotates in the reverse direction by accident, the impeller 200 can be prevented from falling off the pump shaft 100, so that the pump shaft 100 can be stopped in time and rotated in the forward direction after the pump shaft 100 rotates in the reverse direction, without the need of disassembling and repairing the slurry pump.

[0052] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A slurry pump with an impeller that can be reversed and dislodged, comprising a pump shaft and an impeller, wherein the pump shaft is provided with an external thread, and the impeller is provided with a first threaded hole that can be screwed to the external thread, characterized in that: The impeller is provided with a limiting hole located inside the first threaded hole, and the inner diameter of the limiting hole is larger than the inner diameter of the first threaded hole; and the slurry pump further includes: A base, fixed on the end surface of the pump shaft; a driving member disposed on the base and capable of sliding along the axial direction of the pump shaft, the driving member being provided with two first wedge surfaces; and a first elastic member being provided between the driving member and the base, the first elastic member applying a thrust to the driving member to cause the driving member to move away from the pump shaft; At least two limit plates are provided on the base and can slide radially along the pump shaft, and the two limit plates are respectively provided with a second wedge surface that is in contact with the corresponding first wedge surface. When the impeller is rotated and installed on the pump shaft, the bottom surface of the limit hole can push the driving member to slide axially along the pump shaft. The sliding of the driving member pushes the two limit plates to slide radially along the pump shaft, so that the limit plates protrude from the outer side surface of the pump shaft and extend into the limit hole. At least two limiting rods are provided on the impeller, and the two limiting rods can be separated from the corresponding limiting plates or combined with the corresponding limiting plates; The base is provided with a central hole coaxial with the pump shaft; the driving member includes a guide rod slidably inserted into the central hole, a push block fixed to the end of the guide rod, and a push rod fixed to the side of the push block away from the pump shaft; the two first wedge surfaces are respectively formed on both sides of the push block; A one-way bearing is fixedly sleeved on the thrust rod, a base is sleeved on the one-way bearing, a groove is provided on the end surface of the base, and a knocking piece is hinged on the bottom surface of the groove, and the free end of the knocking piece extends beyond the outer side surface of the base; when the thrust rod rotates forward with the pump shaft, the base and the knocking piece rotate synchronously with the pump shaft; when the thrust rod rotates reversely with the pump shaft, the pump shaft does not drive the base to rotate, and the base on the pump shaft will collide with the knocking piece to cause abnormal noise.

2. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 1, characterized in that: The first elastic member is a spring, which is sleeved on the guide rod and abuts between the base and the pushing block.

3. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 1, characterized in that: The base is provided with two guide grooves located on two opposite sides of the center hole, and the two limit plates can be respectively guided and slidably arranged in the corresponding guide grooves; and a second elastic member is respectively provided between each limit plate and the base, and the second elastic member applies an elastic force to the limit plate to make the limit plate close to the center of the base.

4. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 3, characterized in that: Two guide parts are provided on the base, and the two guide grooves are correspondingly provided on the two guide parts; each guide part includes two "L"-shaped guide blocks, and the two guide blocks form the "T"-shaped guide groove.

5. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 4, characterized in that: The limiting plate includes a bottom plate capable of sliding in the wide diameter section of the guide groove, and a process block fixed on the bottom plate, and the process block is capable of sliding in the wide diameter section of the guide groove; the second wedge surface is constructed on the process block.

6. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 2, characterized in that: Each of the limit plates is constructed with a long hole, the center line of which is an arc concentric with the pump shaft; the limit rod is threadedly connected to the impeller, and when the limit rod is combined with the corresponding limit plate, the limit rod is inserted into the long hole on the limit plate.

7. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 6, characterized in that: Two second threaded holes are configured on the impeller, and the limiting rod is a screw rod threadedly connected to the corresponding second threaded holes.

8. The slurry pump for preventing impeller from reverse rotation and falling off according to claim 1, characterized in that: A mounting hole with a square cross section is constructed on the end of the pump shaft; the base includes a mounting plate and a fixing block fixed on the mounting plate and capable of being inserted into the mounting hole.

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