Impeller axial gap compensation structure of oil coal slurry pump

Abstract

The application discloses an impeller axial gap compensation structure of an oil coal slurry pump, relates to the technical field of pumps, and comprises a pump shaft, a main impeller, an auxiliary impeller, a flat key, an impeller nut and a first locking piece. A first key groove is formed in the outer side wall of the pump shaft, a second key groove is formed in the inner side wall of the main impeller and the auxiliary impeller, the flat key is located in the first key groove and the second key groove, a shaft shoulder is formed on the outer surface of the pump shaft, the impeller nut is arranged at the end of the pump shaft, the impeller nut abuts against the main impeller, the first locking piece passes through the impeller nut and is threadedly fixed in the pump shaft, a groove is formed in the mutually close side walls of the main impeller and the auxiliary impeller, a first elastic piece is arranged in the groove, and the first elastic piece is in a compressed state. The application releases elastic potential energy by using the compressed first elastic piece and compensates for the gap caused by the wear of the shaft shoulder, reduces the shaking of the main impeller and the auxiliary impeller, and greatly improves the stability of the main impeller and the auxiliary impeller during rotation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pumps, in particular to an impeller axial gap compensation structure of an oil coal slurry pump. BACKGROUND

[0002] In the coal chemical industry, the medium treated by the oil coal slurry pump is a non-Newtonian fluid with high solid content and high viscosity under high temperature and high pressure conditions. Under the action of the high temperature medium, the core components (main impeller, auxiliary impeller and pump shaft) in the pump are subjected to thermal deformation and material mechanical property degradation. The main impeller and the auxiliary impeller are locked on the pump shaft through an impeller nut. Since the materials of the main impeller and the auxiliary impeller (high chromium cast iron) are different from that of the pump shaft (alloy steel), the wear degree of the pump shaft is greater than that of the main impeller and the auxiliary impeller.

[0003] The wear occurs at the contact position between the auxiliary impeller and the pump shaft shoulder, so that an axial gap is generated between the auxiliary impeller and the pump shaft shoulder. The gap causes the main impeller and the auxiliary impeller to change from a fastened state to a loose state, resulting in axial locking failure. Under high-speed rotation of the pump shaft, the loose main impeller and auxiliary impeller will vibrate. Ultimately, the whole machine will vibrate, the pump will run unstably and the efficiency will be reduced, and the main impeller and the auxiliary impeller will have the risk of falling off after loosening to a certain extent. SUMMARY

[0004] In order to improve the stability of the main impeller and the auxiliary impeller during rotation, the application provides an impeller axial gap compensation structure of an oil coal slurry pump.

[0005] The impeller axial gap compensation structure of the oil coal slurry pump provided by the application adopts the following technical scheme:

[0006] An impeller axial gap compensation structure of an oil coal slurry pump, comprising a pump shaft, a main impeller, an auxiliary impeller, a flat key, an impeller nut and a first locking piece, a first key groove is formed in the outer side wall of the pump shaft, the flat key is arranged in the first key groove, the main impeller and the auxiliary impeller are both arranged on the pump shaft in a sliding mode, a second key groove is formed in the inner side wall of each of the main impeller and the auxiliary impeller, the flat key is arranged in the second key groove, a shaft shoulder is formed on the outer surface of the pump shaft, the end wall of the auxiliary impeller away from the main impeller abuts against the shaft shoulder, the impeller nut is arranged at the end of the pump shaft, the impeller nut abuts against the end wall of the main impeller away from the auxiliary impeller, the first locking piece passes through the impeller nut and is threadedly fixed in the pump shaft, a groove is formed in the side wall of each of the main impeller and the auxiliary impeller, the first elastic piece is arranged in the groove, the two ends of the first elastic piece abut against the main impeller and the auxiliary impeller respectively, and the first elastic piece is in a compressed state.

[0007] By adopting the technical scheme, the first locking member locks the impeller nut on the pump shaft, the impeller nut locks the main impeller and the auxiliary impeller on the pump shaft, the pump shaft drives the main impeller and the auxiliary impeller to rotate through the flat key, after the impeller runs for a long time, the contact surface of the shaft shoulder and the auxiliary impeller will be worn and a gap will be generated, at this time, the compressed first elastic member will release the elastic potential energy and compensate for the gap generated by the wear, thereby reducing the shaking of the main impeller and the auxiliary impeller, and thus greatly improving the stability of the main impeller and the auxiliary impeller during rotation.

[0008] Preferably, an impeller blocking ring is arranged on the pump shaft in a sliding manner, a limiting groove is arranged on the end wall of the main impeller away from the auxiliary impeller, the impeller blocking ring is located in the limiting groove, and opposite sides of the impeller blocking ring abut against the impeller nut and the main impeller, respectively.

[0009] By adopting the technical scheme, the impeller nut abuts against the main impeller through the impeller blocking ring, so that wear is not easily generated between the main impeller and the impeller nut, thereby improving the locking effect of the impeller nut.

[0010] Preferably, accommodating grooves are arranged on the side walls of the main impeller and the auxiliary impeller close to each other and outside the grooves, and a blocking ring is arranged in the accommodating grooves of the main impeller and the auxiliary impeller and sealingly connected to the main impeller and the auxiliary impeller at opposite sides.

[0011] By adopting the technical scheme, when the first elastic member releases the elastic potential energy and compensates for the gap generated by the wear, the first elastic member will push the auxiliary impeller to move away from the main impeller, at this time, a gap will be generated between the main impeller and the auxiliary impeller, and the blocking ring can shield the gap between the main impeller and the auxiliary impeller, so that the oil coal slurry medium cannot enter the grooves of the main impeller and the auxiliary impeller, thereby reducing the wear of the first elastic member in the grooves by the oil coal slurry medium.

[0012] Preferably, the cross section of the blocking ring is V-shaped, sealing rings are fixedly arranged on the side walls of the two connecting rings away from each other, and the two connecting rings are fixedly installed on the main impeller and the auxiliary impeller through a plurality of second locking members, and the plurality of sealing rings are respectively inserted into the main impeller and the auxiliary impeller.

[0013] By adopting the technical scheme, the second locking members are used to fixedly install the two connecting rings on the main impeller and the auxiliary impeller, that is, the blocking ring is fixedly installed in the accommodating grooves, the connecting rings drive the sealing rings to be inserted into the main impeller and the auxiliary impeller, thereby being able to seal the two ends of the blocking ring.

[0014] Preferably, two flat keys are symmetrically arranged along the radial direction of the pump shaft, a lifting block is slidably arranged in the flat key along the radial direction of the pump shaft, a push block is arranged at the end of the lifting block away from the pump shaft, a push groove is arranged in the end wall of the main impeller and the auxiliary impeller, the push block is located in the push groove, a sliding groove is arranged in the flat key on the side of the lifting block away from the push block, a driving block is slidably arranged in the sliding groove, the side walls of the lifting block and the driving block that are close to each other are both arranged to be inclined, a driving rod is rotatably arranged in the flat key, the driving rod is screwed into the driving block, a second elastic member is arranged in the flat key to drive the driving rod to rotate, a reverse stopping component is arranged in the flat key to limit the reverse rotation of the driving rod, an unlocking rod is slidably arranged in the flat key to unlock the reverse stopping component, one end of the unlocking rod is connected with the reverse stopping component, and the other end of the unlocking rod is in abutment with the impeller retaining ring.

[0015] By adopting the above technical scheme, when the rotating speed of the oil coal slurry pump increases, the thrust of the oil coal slurry on the main impeller also increases, at this time, the main impeller is easily pushed to displace by the oil coal slurry, so that a gap is generated between the main impeller and the impeller retaining ring, and the oil coal slurry enters the main impeller through the gap, which aggravates the wear between the main impeller and the pump shaft. Before the flat key is installed, the driving rod is first rotated, the driving rod drives the driving block to move away from the lifting block, and the driving rod drives the second elastic member to deform, so that the second elastic member stores elastic potential energy. After the driving rod is loosened, the driving rod will not rotate back to the original position under the action of the reverse stopping component, then the flat key is installed in the first key groove of the pump shaft, when the impeller nut pushes the impeller retaining ring to abut against the main impeller, the impeller retaining ring pushes the unlocking rod to move and unlock the reverse stopping component, at this time, the second elastic member releases the elastic potential energy and drives the driving rod to rotate, the driving rod drives the driving block to move close to the lifting block, and the lifting block drives the push block to move into the push groove. When the thrust of the oil coal slurry increases, the lifting block is locked by the driving rod and the driving block, so that the push block is stably located in the push groove, thereby preventing the main impeller from displacing and reducing the entry of the oil coal slurry into the main impeller.

[0016] Preferably, a sliding block is slidably arranged on the side wall of the lifting block away from the driving block along the axial direction of the pump shaft, and the push block is fixedly arranged on the sliding block.

[0017] By adopting the above technical scheme, the push block can be adjusted in position on the lifting block through the sliding block, so that the push block can move synchronously after the first elastic member pushes the auxiliary impeller to move, thereby ensuring that the push block can always be located in the push groove.

[0018] Preferably, the reverse stopping component comprises a reverse stopping gear ring, a rotating disc, a plurality of reverse stopping pawls and a third elastic member, the reverse stopping gear ring is slidingly arranged in the sliding groove, the reverse stopping gear ring is fixedly connected with the unlocking rod away from the impeller blocking ring, the driving rod passes through the reverse stopping gear ring, the rotating disc is fixedly arranged on the driving rod, the plurality of reverse stopping pawls are rotationally arranged on the rotating disc, and the third elastic member is arranged at the rotational connection position of the reverse stopping pawls and the rotating disc.

[0019] By adopting the above technical scheme, when the driving rod rotates and drives the driving block to move away from the lifting block, the driving rod drives the plurality of reverse stopping pawls to rotate in the reverse stopping gear ring through the rotating disc, and when the driving rod is loosened, the third elastic member drives the reverse stopping pawls to be clamped in the reverse stopping gear ring, so that the driving rod cannot be reversely rotated, thereby enabling the second elastic member to store elastic potential energy, and when the impeller blocking ring drives the unlocking rod to move, the unlocking rod drives the reverse stopping gear ring to move, so that the reverse stopping gear ring is separated from the reverse stopping pawls, at this time, the limitation of the driving rod is removed, so that the driving rod can be reversely rotated and driven to move close to the lifting block.

[0020] Preferably, the opposite two side walls of the lifting block are provided with positioning blocks, and the inner side walls of the flat keys and the positions of the two sides of the lifting block are provided with positioning grooves, and the two positioning blocks are slidingly arranged in the two positioning grooves along the moving direction of the lifting block.

[0021] By adopting the above technical scheme, when the lifting block moves up and down, the positioning blocks slide in the positioning grooves, and the cooperation between the positioning blocks and the positioning grooves prevents the lifting block from sliding out of the flat keys.

[0022] Preferably, the end of the driving rod away from the driving block is fixedly provided with a knob.

[0023] By adopting the above technical scheme, the knob is used to drive the driving rod to rotate.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The compressed first elastic member releases the elastic potential energy and compensates for the gap caused by the wear of the shaft shoulder, reduces the shaking of the main impeller and the auxiliary impeller, and greatly improves the stability of the main impeller and the auxiliary impeller during rotation;

[0026] 2. With the aid of the blocking ring, when the first elastic member releases the elastic potential energy and compensates for the gap caused by the wear, the first elastic member drives the auxiliary impeller to move away from the main impeller, at this time, a gap is generated between the main impeller and the auxiliary impeller, the blocking ring can block the gap between the main impeller and the auxiliary impeller, so that the oil coal slurry medium cannot enter the groove of the main impeller and the auxiliary impeller, thereby reducing the wear of the first elastic member in the groove by the oil coal slurry medium;

[0027] 3. Before installing the flat key, the drive rod is rotated via the push block. The drive rod moves the drive block away from the lifting block, and the drive rod also causes the second elastic element to deform, storing elastic potential energy. After the drive rod is released, it will not rotate back to its original position due to the action of the anti-reverse component. Then, the flat key is installed in the first keyway of the pump shaft. When the impeller nut pushes the impeller retaining ring against the main impeller, the impeller retaining ring pushes the unlocking rod to move and unlock the anti-reverse component. At this time, the second elastic element releases its elastic potential energy and drives the drive rod to rotate. The drive rod moves the drive block closer to the lifting block, and the lifting block moves the push block into the push groove. When the thrust of the oil-coal slurry increases, the drive rod and drive block lock the lifting block, making the push block stably located in the push groove, thus preventing the main impeller from shifting and reducing the possibility of oil-coal slurry entering the main impeller. Attached Figure Description

[0028] Figure 1 This is a frontal schematic diagram of the overall structure of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 1 of this application;

[0029] Figure 2 This is a reverse schematic diagram of the overall structure of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 1 of this application;

[0030] Figure 3 This is an overall structural cross-sectional view of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 1 of this application;

[0031] Figure 4 This is an exploded view of the overall structure of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 1 of this application;

[0032] Figure 5 This is an overall structural cross-sectional view of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 2 of this application;

[0033] Figure 6 For this application Figure 5 Enlarged view of point A in the middle;

[0034] Figure 7 For this application Figure 5 Enlarged view of point B in the middle;

[0035] Figure 8 This is a partial structural schematic diagram of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 2 of this application;

[0036] Figure 9 This is a partial exploded cross-sectional view of the impeller axial clearance compensation structure of the oil-coal slurry pump in Embodiment 2 of this application;

[0037] Figure 10 For this application Figure 9 Enlarged diagram of point C in the middle.

[0038] 1, pump shaft; 2, main impeller; 3, auxiliary impeller; 4, flat key; 5, impeller nut; 6, first locking piece; 7, first key groove; 8, second key groove; 9, shaft shoulder; 10, groove; 11, first elastic piece; 12, impeller retaining ring; 13, limiting groove; 14, accommodating groove; 15, retaining ring; 16, connecting ring; 17, sealing ring; 18, second locking piece; 19, lifting block; 20, push block; 21, push groove; 22, sliding groove; 23, driving block; 24, driving rod; 25, second elastic piece; 26, anti-reverse component; 261, anti-reverse gear ring; 262, rotating disc; 263, anti-reverse pawl; 264, third elastic piece; 27, unlocking rod; 28, sliding block; 29, positioning block; 30, positioning groove; 31, knob; 32, gasket; 33, chamfer; 34, sealing groove; 35, avoiding groove. DETAILED DESCRIPTION

[0039] The above description is made in conjunction with the accompanying drawings. Figures 1-10 The application is further described in detail.

[0040] The application discloses an impeller axial gap compensation structure of an oil coal slurry pump.

[0041] Embodiment 1:

[0042] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the impeller axial gap compensation structure of the oil coal slurry pump comprises a pump shaft 1, a main impeller 2, an auxiliary impeller 3, a flat key 4, an impeller nut 5 and a first locking piece 6. A first key groove 7 is formed on the outer side wall of the pump shaft 1 in the axial direction of the pump shaft 1, and part of the flat key 4 is located in the first key groove 7. The inner side walls of the main impeller 2 and the auxiliary impeller 3 are both provided with a second key groove 8 with open ends, the main impeller 2 and the auxiliary impeller 3 are slidingly installed on the pump shaft 1, and the other part of the flat key 4 is located in the second key groove 8 of the main impeller 2 and the auxiliary impeller 3. When the pump shaft 1 rotates, the main impeller 2 and the auxiliary impeller 3 are driven to rotate by the flat key 4.

[0043] The outer side wall of the pump shaft 1 is outwardly protruded to form a shaft shoulder 9, the end of the main impeller 2 abuts against the end of the auxiliary impeller 3, and the end wall of the auxiliary impeller 3 away from the main impeller 2 abuts against the shaft shoulder 9. An impeller retaining ring 12 is slidingly installed on the pump shaft 1, a circular limiting groove 13 is formed on the end wall of the main impeller 2 away from the auxiliary impeller 3, and the impeller retaining ring 12 is located in the limiting groove 13.

[0044] The impeller nut 5 is threadedly mounted at the end of the pump shaft 1, the end of the impeller nut 5 abuts against the impeller blocking ring 12, the first locking piece 6 passes through the impeller nut 5 and is threadedly fixed in the pump shaft 1, in the application, the first locking piece 6 can be selected as a bolt, and a gasket 32 is mounted between the first locking piece 6 and the impeller nut 5. The first locking piece 6 fixes the impeller nut 5 on the pump shaft 1, the impeller nut 5 pushes the main impeller 2 to move through the impeller blocking ring 12, the main impeller 2 pushes the auxiliary impeller 3 to move and abut against the shaft shoulder 9, so that the main impeller 2 and the auxiliary impeller 3 can be locked on the pump shaft 1.

[0045] The end walls of the main impeller 2 and the auxiliary impeller 3 close to each other are both provided with annular grooves 10, the two grooves 10 are communicated with each other on the side close to each other, and the first elastic pieces 11 are installed in the grooves 10.

[0046] The implementation principle of the impeller axial gap compensation structure of the oil coal slurry pump in the application is that the first locking piece 6 firmly locks the impeller nut 5 on the pump shaft 1, and then the main impeller 2 and the auxiliary impeller 3 are pressed and fixed on the pump shaft 1 through the impeller nut 5. When the pump shaft 1 operates, the torque is transmitted through the flat key 4, and the main impeller 2 and the auxiliary impeller 3 are synchronously rotated. In the long-term operation process, due to mechanical wear, a gap will gradually be generated between the contact surface between the shaft shoulder 9 of the pump shaft 1 and the auxiliary impeller 3. At this time, the first elastic piece 11 in the compression state will automatically release the elastic potential energy stored therein, and push the auxiliary impeller 3 to move in the axial direction, so as to compensate the gap caused by wear in real time. The elastic compensation mechanism effectively inhibits the axial movement and radial shaking of the main impeller 2 and the auxiliary impeller 3 in high-speed rotation, and significantly improves the dynamic stability and overall reliability of the impeller assembly in the operation process.

[0047] Embodiment 2:

[0048] With reference to Figure 5 and Figure 6 , the difference between the embodiment and the embodiment 1 is that the outer sides of the end walls of the main impeller 2 and the auxiliary impeller 3 close to each other are both formed with annular chamfers 33, and the connecting rings 16 are installed on the annular chamfers 33 of the main impeller 2 and the auxiliary impeller 3. The blocking rings 15 are fixedly installed on the side close to each other of the two connecting rings 16, and the cross section of the blocking ring 15 is V-shaped. The end walls of the main impeller 2 and the auxiliary impeller 3 close to each other are both provided with annular accommodating grooves 14, and the blocking ring 15 is located in the accommodating groove 14.

[0049] The sealing ring 17 is fixedly installed on the side wall of the connecting ring 16 close to the chamfer 33, and the main impeller 2 and the auxiliary impeller 3 are provided with annular sealing grooves 34 on the chamfer 33, and the two sealing rings 17 are located in the two sealing grooves 34 respectively. A plurality of second locking members 18 are installed on each connecting ring 16 at equal intervals along the circumference of the connecting ring 16, the second locking members 18 pass through the sealing ring 17 and are screw-fixed in the main impeller 2 or the auxiliary impeller 3, and in the application, the second locking members 18 can be selected as bolts, the connecting ring 16 and the sealing ring 17 can be selected as hard metal parts, and the blocking ring 15 can be selected as a soft metal part.

[0050] The two connecting rings 16 are fixed on the main impeller 2 and the auxiliary impeller 3 respectively by using the plurality of second locking members 18, and the second locking members 18 press the two sealing rings 17 in the two sealing grooves 34, so that the gap between the connecting ring 16 and the main impeller 2 and the auxiliary impeller 3 can be sealed.

[0051] When the first elastic member 11 releases potential energy and pushes the auxiliary impeller 3 to move axially to compensate for the wear gap, a dynamic changing gap will be generated between the end faces of the main impeller 2 and the auxiliary impeller 3. At this time, the blocking ring 15 located between the main impeller 2 and the auxiliary impeller 3 plays a shielding and sealing role. The blocking ring 15 effectively shields the gap opening between the main impeller 2 and the auxiliary impeller 3, forms a barrier, and prevents the oil-coal slurry medium rich in solid particles from invading the groove 10 inside the main impeller 2 and the auxiliary impeller 3. Finally, it ensures that the first elastic member 11 is always in a relatively clean groove 10, significantly reduces the risk of medium wear, blockage or corrosion of the first elastic member 11, and thus guarantees the long-term reliable operation of the compensation mechanism.

[0052] With reference to Figure 5 , Figure 7 , Figure 8 and Figure 9 , two flat keys 4 are installed, and the two flat keys 4 are symmetrically installed on the two sides of the pump shaft 1 along the diameter direction of the pump shaft 1. A sliding groove 22 is formed in the flat key 4 along the length direction of the flat key 4, and a driving block 23 is slidingly installed in the sliding groove 22. A driving rod 24 is rotatably installed in the flat key 4, and the driving rod 24 threadedly penetrates the driving block 23. An avoiding groove 35 is formed in the flat key 4 close to the impeller blocking ring 12 on the side of the pump shaft 1, one end of the driving rod 24 is located in the flat key 4, the other end of the driving rod 24 extends into the flat key 4 and is located in the avoiding groove 35, and a knob 31 is fixedly installed on the end of the driving rod 24 located in the avoiding groove 35. The knob 31 drives the driving rod 24 to rotate, and the driving rod 24 can drive the driving block 23 to move in the sliding groove 22.

[0053] The lifting block 19 is slidably installed on the inner side of the driving block 23 away from the pump shaft 1 along the diameter direction of the pump shaft 1, and the side walls of the driving block 23 and the lifting block 19 that are close to each other are both obliquely arranged, and the inclined surfaces of the lifting block 19 and the driving block 23 abut each other. The lifting block 19 can be driven to move towards or away from the pump shaft 1 through the inclined surfaces during the movement of the driving block 23.

[0054] The opposite side walls of the lifting block 19 are both fixedly installed with a positioning block 29, and the inner side wall of the flat key 4 is provided with two positioning grooves 30, the two positioning grooves 30 are respectively located on the opposite sides of the lifting block 19, and the two positioning blocks 29 are slidably installed in the two positioning grooves 30 along the diameter direction of the pump shaft 1. The lifting block 19 drives the positioning block 29 to slide in the positioning groove 30 during the sliding process, so as to limit and guide the movement of the lifting block 19.

[0055] The end wall of the lifting block 19 away from the driving block 23 is slidably installed with a sliding block 28 along the axis direction of the pump shaft 1, and the cross section of the sliding block 28 is convex. The end of the sliding block 28 away from the driving block 23 is fixedly installed with a pushing block 20, and the cross section of the pushing block 20 is triangular. The inner side of the end wall of the main impeller 2 and the auxiliary impeller 3 close to each other is symmetrically provided with two pushing grooves 21 along the diameter direction of the pump shaft 1, and the pushing block 20 is located in the pushing groove 21 of the main impeller 2 and the auxiliary impeller 3.

[0056] In order to ensure that the pushing block 20 can always be accurately embedded in the pushing groove 21, the pushing block 20 is slidably connected with the lifting block 19 through the sliding block 28. When the first elastic member 11 drives the auxiliary impeller 3 to move, the pushing block 20 can freely slide on the lifting block 19 through the sliding block 28, so that the pushing block 20 can always be located in the pushing groove 21.

[0057] Referring to Figure 8 , Figure 9 and Figure 10 , the flat key 4 is installed with a second elastic member 25 in the sliding groove 22, and the second elastic member 25 is sleeved on the driving rod 24. In the application, the second elastic member 25 can be selected as a torsion spring, one end of the second elastic member 25 is fixedly connected with the flat key 4, and the other end is fixedly connected with the driving rod 24.

[0058] The flat key 4 is installed with a reverse stopping component 26 in the sliding groove 22, the reverse stopping component 26 comprises a reverse stopping gear ring 261, a rotating disc 262, four reverse stopping pawls 263 and third elastic members 264, the rotating disc 262 is fixedly installed on the driving rod 24, the four reverse stopping pawls 263 are rotatably installed on the rotating disc 262 along the circumferential direction of the rotating disc 262, and the four third elastic members 264 are installed at the rotating connection positions of the four reverse stopping pawls 263 and the rotating disc 262. In the application, the third elastic member 264 can be selected as a torsion spring.

[0059] Two unlocking rods 27 are slidably installed in the flat key 4, and are located on opposite sides of the driving rod 24. One end of the unlocking rod 27 is located in the sliding groove 22, the reverse stop gear ring 261 is fixedly installed at the end of the unlocking rod 27 located in the sliding groove 22, and the third elastic member 264 drives the reverse stop pawl 263 to be clamped in the reverse stop gear ring 261. The other end of the unlocking rod 27 is located in the avoiding groove 35, and the impeller blocking ring 12 moves to abut against the two unlocking rods 27.

[0060] The implementation principle of the embodiment 2 of the present application is that: after the first elastic member 11 pushes the auxiliary impeller 3 to move to compensate the gap, when the rotating speed of the oil coal slurry pump is increased, the thrust of the oil coal slurry on the main impeller 2 is also increased, which is easy to push the main impeller 2 away from the original position, resulting in that a gap appears between the main impeller 2 and the impeller blocking ring 12. After the oil coal slurry enters the gap, the wear between the main impeller 2 and the pump shaft 1 is aggravated. In order to solve this problem, before the flat key 4 is installed, the knob 31 is used to rotate the driving rod 24, the driving rod 24 drives the four reverse stop pawls 263 to rotate in the reverse stop gear ring 261 through the rotating disc 262, the driving rod 24 drives the driving block 23 to move in the direction away from the lifting block 19, the lifting block 19 moves into the flat key 4, and at the same time the driving rod 24 drives the second elastic member 25 to deform and store elastic potential energy.

[0061] After the driving rod 24 is loosened, the third elastic member 264 makes the reverse stop pawl 263 clamped into the reverse stop gear ring 261, which prevents the reverse rotation of the driving rod 24, and ensures that the second elastic member 25 remains in the energy storage state. Then the flat key 4 is installed into the first key groove 7 of the pump shaft 1. When the impeller nut 5 presses the impeller blocking ring 12 to abut against the main impeller 2, the impeller blocking ring 12 pushes the two unlocking rods 27 to move, the two unlocking rods 27 drive the reverse stop gear ring 261 to move and separate from the reverse stop pawl 263, and the locking of the reverse stop part 26 is released. At this time, the second elastic member 25 releases energy, drives the driving rod 24 to reverse, and makes the driving block 23 move towards the lifting block 19, and then pushes the block 20 into the pushing groove 21 through the lifting block 19. Thus, when the thrust of the oil coal slurry is increased, the block 20 can be stably positioned in the pushing groove 21, the movement of the lifting block 19 is limited through the locking action of the driving rod 24 and the driving block 23, so that the displacement of the main impeller 2 is effectively prevented, and the possibility of the oil coal slurry entering the inside of the main impeller 2 is reduced.

[0062] When the pump shaft 1 is worn too much, it needs to be disassembled and replaced with a new pump shaft 1. After the flat key 4 is removed from the pump shaft 1, the knob 31 is used to drive the driving rod 24 to slowly rotate, the driving rod 24 drives the four reverse stop pawls 263 to slowly rotate through the rotating disc 262, and at the same time the unlocking rod 27 is used to pull the limiting gear ring to move, so that the reverse stop pawl 263 can re-enter the limiting gear ring, which is convenient for the limiting of the reverse stop part 26 to be used again.

[0063] The above merely describes optional embodiments of the present disclosure, and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An impeller axial gap compensation structure of an oil coal slurry pump, characterized by: The pump shaft (1) includes a pump shaft (1), a main impeller (2), an auxiliary impeller (3), a key (4), an impeller nut (5), and a first locking element (6). A first keyway (7) is provided on the outer side wall of the pump shaft (1), and the key (4) is disposed in the first keyway (7). The main impeller (2) and the auxiliary impeller (3) are both slidably disposed on the pump shaft (1). A second keyway (8) is provided on the inner side wall of the main impeller (2) and the auxiliary impeller (3), and the key (4) is located in the second keyway (8). A shoulder (9) is formed on the outer surface of the pump shaft (1), and the auxiliary impeller (3) is located away from the main impeller (2). The end wall of the impeller abuts against the shoulder (9), the impeller nut (5) is set at the end of the pump shaft (1), the impeller nut (5) abuts against the end wall of the main impeller (2) away from the auxiliary impeller (3), the first locking member (6) passes through the impeller nut (5) and is threadedly fixed in the pump shaft (1), the main impeller (2) and the auxiliary impeller (3) are provided with grooves (10) on their side walls that are close to each other, the first elastic member (11) is provided in the groove (10), the two ends of the first elastic member (11) abut against the main impeller (2) and the auxiliary impeller (3) respectively, and the first elastic member (11) is in a compressed state; An impeller retaining ring (12) is slidably mounted on the pump shaft (1). A limiting groove (13) is formed on the end wall of the main impeller (2) away from the auxiliary impeller (3). The impeller retaining ring (12) is located in the limiting groove (13). The opposite sides of the impeller retaining ring (12) abut against the impeller nut (5) and the main impeller (2), respectively. Two flat keys (4) are symmetrically arranged along the radial direction of the pump shaft (1). A lifting block (19) is slidably mounted in the flat key (4) along the radial direction of the pump shaft (1). A push block (20) is provided at the end of the lifting block (19) away from the pump shaft (1). Push grooves (21) are formed on the inner sides of the end walls of the main impeller (2) and the auxiliary impeller (3) that are close to each other. The push block (20) is located in the push groove (21). The lifting block (19) is located in the flat key (4). A groove (22) is provided on the side away from the push block (20). A drive block (23) is slidably arranged in the groove (22). The side walls of the lifting block (19) and the drive block (23) are inclined. A drive rod (24) is rotatably arranged in the key (4). The drive rod (24) is threaded through the drive block (23). A second elastic element (25) for driving the drive rod (24) to rotate is provided in the key (4). A non-reverse component (26) for limiting the reverse rotation of the drive rod (24) is provided in the key (4). An unlocking rod (27) for unlocking the non-reverse component (26) is slidably arranged in the key (4). One end of the unlocking rod (27) is connected to the non-reverse component (26), and the other end abuts against the impeller retaining ring (12).

2. The impeller axial clearance compensation structure of an oil coal slurry pump according to claim 1, characterized in that: The accommodating grooves (14) are arranged on the side walls of the main impeller (2) and the auxiliary impeller (3) close to each other and outside the grooves (10), and the stop rings (15) are arranged in the accommodating grooves (14).

3. The impeller axial clearance compensation structure of an oil coal slurry pump according to claim 2, characterized in that: The cross section of the stop ring (15) is V-shaped, and the connecting rings (16) are fixedly arranged on the opposite sides of the stop ring (15), the sealing rings (17) are fixedly arranged on the side walls of the two connecting rings (16) away from each other, the two connecting rings (16) are fixedly installed on the main impeller (2) and the auxiliary impeller (3) by the second locking pieces (18), and the sealing rings (17) are inserted into the main impeller (2) and the auxiliary impeller (3) respectively.

4. The impeller axial clearance compensation structure of an oil coal slurry pump according to claim 1, characterized in that: The sliding block (28) is arranged on the side wall of the lifting block (19) away from the driving block (23) and slides along the axial direction of the pump shaft (1), and the push block (20) is fixedly arranged on the sliding block (28).

5. The impeller axial clearance compensation structure of an oil coal slurry pump according to claim 1, characterized in that: The reverse stopping component (26) comprises a reverse stopping gear ring (261), a rotating disc (262), a plurality of reverse stopping pawls (263) and a third elastic piece (264), the reverse stopping gear ring (261) is slidingly arranged in the sliding groove (22), the reverse stopping gear ring (261) is fixedly connected with the end of the unlocking rod (27) away from the impeller stop ring (12), the driving rod (24) penetrates through the reverse stopping gear ring (261), the rotating disc (262) is fixedly arranged on the driving rod (24), the reverse stopping pawls (263) are rotationally arranged on the rotating disc (262), and the third elastic piece (264) is arranged at the rotation connection position of the reverse stopping pawls (263) and the rotating disc (262).

6. The impeller axial clearance compensation structure of an oil coal slurry pump according to claim 1, characterized in that: The positioning blocks (29) are arranged on the opposite side walls of the lifting block (19), the positioning grooves (30) are arranged on the inner side walls of the flat keys (4) and located at the two sides of the lifting block (19), and the two positioning blocks (29) are slidingly arranged in the two positioning grooves (30) along the moving direction of the lifting block (19).

7. The impeller axial clearance compensation structure of an oil slurry pump according to claim 1, characterized in that: The knob (31) is fixedly arranged on the end of the driving rod (24) away from the driving block (23).

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