Chemical process pump with impeller blades gradually changed in time sequence

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to a chemical process pump with impeller blades gradually changing in time sequence, which comprises a pump shell, an impeller assembly rotatably mounted in the pump shell and a pump shaft used for providing power for rotation of the impeller assembly, and the impeller assembly comprises movably arranged blades; the transmission mechanism is arranged on the pump shell and used for transmitting power between the pump shaft and the impeller assembly; the centrifugal connecting mechanism is arranged on the pump shaft and used for achieving power connection between the pump shaft and the transmission mechanism. In the initial state, the pump shaft and the impeller assembly are in a disconnected state, and along with increase of the rotating speed of the pump shaft, the blades are gradually adjusted from the initial gathering state to the opening working state through transmission of the transmission mechanism, the centrifugal connecting mechanism and the adjusting mechanism; when the impeller assembly initially rotates, the blades are in a gathering state, the effective circulation area of an outlet of the impeller assembly can be reduced, the acting capacity of the blades on fluid is reduced, and the initial torque and the motor current peak value are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal pumps, in particular to a chemical process pump with gradually changing timing of impeller blades. BACKGROUND

[0002] A chemical process pump is a key equipment for transporting high-temperature, high-pressure, and corrosive liquids, and is widely used in the production process of the petroleum and chemical industry. The main function of the petroleum and chemical process pump is to transport crude oil, natural gas, and chemical products through pipelines to different processing units or production equipment to ensure the smooth progress of the production process. The process pump usually adopts a non-variable displacement centrifugal pump, which mainly uses an impeller to generate centrifugal force to pressurize and transport the liquid. The centrifugal process pump has the same characteristics as the common process pump, and it must be primed with liquid material before starting to completely discharge the air in the pump, thereby ensuring smooth liquid transportation.

[0003] For example, the patent CN110848174B discloses a chemical process pump with high anti-cavitation performance, which comprises a pump body assembly and a flow guide assembly. The pump body assembly comprises an impeller, a pump shaft, and a pump shell. One end of the pump shaft is drivingly connected to the impeller, and the pump shaft is located inside the pump shell and is rotationally connected to the pump shell. The outer wall of the pump shell is provided with a water inlet and a water outlet, which are in communication with each other. The flow guide assembly comprises a connecting block and a flow guide plate, which are integrally formed. The two ends of the connecting block are fixedly connected to the pump shell, and the connecting block and the pump shell form a flow guide. The pump shaft drives the impeller to rotate to achieve the transportation of the medium.

[0004] In the prior art as described above, the blades on the impeller are fixedly arranged. At the starting moment of the process pump, the blades work on the fluid with full load. However, when the impeller accelerates from static to rated speed, the blades need to overcome the static friction and inertia resistance of the fluid. Since the fluid in the pump has not formed a stable flow, a large torque is required for the starting of the impeller, which will cause a sharp increase in power consumption at the starting moment. Therefore, there is an urgent need for a chemical process pump with gradually changing timing of impeller blades to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a chemical process pump with gradually changing timing of impeller blades to solve the above problems in the prior art.

[0006] In order to achieve the above purpose, the present application provides the following technical solution: a chemical process pump with gradually changing timing of impeller blades, comprising a pump shell, an impeller assembly rotationally installed inside the pump shell, and a pump shaft for providing power for the rotation of the impeller assembly, wherein the impeller assembly comprises movably arranged blades.

[0007] Further comprising: a transmission mechanism arranged on the pump shell for transmitting power between the pump shaft and the impeller assembly; a centrifugal connecting mechanism arranged on the pump shaft for realizing power connection between the pump shaft and the transmission mechanism; an adjusting mechanism arranged on the impeller assembly for adjusting the opening and closing of the blades;

[0008] After the pump shaft is driven to the rated speed, the centrifugal connecting mechanism is opened under the action of centrifugal force and realizes power connection with the transmission mechanism; after the centrifugal connecting mechanism is connected with the transmission mechanism, the centrifugal connecting mechanism pushes the transmission mechanism to act under the rotation of the pump shaft, and the transmission mechanism presses the adjusting mechanism, and the blades are expanded to the working state through the adjusting mechanism.

[0009] Preferably, the impeller assembly further comprises a rear cover plate, and the blades are movably mounted at the front end of the rear cover plate and are gathered at the front end of the rear cover plate in the initial state.

[0010] Preferably, the transmission mechanism comprises a telescopic outer transmission sleeve, an inner transmission sleeve and an auxiliary driving sleeve, the auxiliary driving sleeve is arranged on the pump shell, and a thread is formed on the inner wall of the auxiliary driving sleeve and matched with the centrifugal connecting mechanism.

[0011] Preferably, the centrifugal connecting mechanism comprises a mounting bracket which is clamped at one end of the pump shaft close to the impeller assembly, and a centrifugal jacking arm movably mounted on the side of the mounting bracket, when the pump shaft drives the mounting bracket to rotate, the centrifugal jacking arm extends out along the outside of the mounting bracket under the action of centrifugal force and is clamped on the inner transmission sleeve.

[0012] Preferably, the centrifugal connecting mechanism further comprises a threaded connecting assembly arranged on the inner transmission sleeve and corresponding to the position of the centrifugal jacking arm, when the centrifugal jacking arm is clamped on the inner transmission sleeve, the threaded connecting assembly is pressed by the centrifugal jacking arm, and the threaded connecting assembly is connected with the thread on the inner wall of the auxiliary driving sleeve.

[0013] Preferably, after the threaded connecting assembly is connected with the thread on the inner wall of the auxiliary driving sleeve, when the pump shaft drives the centrifugal connecting mechanism and the inner transmission sleeve to rotate, the inner transmission sleeve can be synchronously driven to move towards the side close to the outer transmission sleeve.

[0014] Preferably, the adjusting mechanism comprises an adjusting sleeve rotatably mounted at the rear end of the rear cover plate, an adjusting rod arranged in the inner part of the adjusting sleeve and screw-connected with the adjusting sleeve, and the adjusting rod can drive the adjusting sleeve to rotate axially when the adjusting rod is pressed.

[0015] Preferably, the adjusting mechanism further comprises a positioning plug rod arranged in the inner part of the adjusting sleeve for limiting the axial rotation of the adjusting rod, and a reset spring sleeved on the outside of the positioning plug rod for driving the adjusting rod to reset.

[0016] Preferably, the adjusting mechanism further comprises a gear set arranged at the rear end of the rear cover plate for transmitting between the vane and the adjusting sleeve.

[0017] Preferably, the interior of the pump shell is provided with an annular slide rail, the peripheral side of the outer transmission sleeve is provided with a roller bracket, and the roller bracket is slidingly arranged in the annular slide rail, and the outer transmission sleeve is rotatably arranged on the pump shell through the annular slide rail and the roller bracket.

[0018] In the above technical solution, the beneficial effects of the present application are as follows: in the initial state, the pump shaft and the impeller assembly are disconnected, and as the rotation speed of the pump shaft increases, the vane is gradually adjusted from the initial gathering state to the open working state through the transmission mechanism, the centrifugal connecting mechanism and the adjusting mechanism; when the impeller assembly is initially rotated, the vane is in a gathering state, which can reduce the effective flow area of the outlet of the impeller assembly, reduce the work done by the vane on the fluid, and reduce the initial torque and the peak motor current, thereby reducing the starting energy consumption; the vane is gradually adjusted with time, and the system demand is gradually matched, so that the energy waste caused by full-load starting can be greatly avoided.

[0019] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the present disclosure.

[0020] This application file provides an overview of various implementations or examples of the technology described in this disclosure and is not intended to be all inclusive or to provide an exhaustive list of features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0022] Figure 1 is a structural schematic view of one side of the whole application;

[0023] Figure 2 is a structural schematic view of the other side of the whole application;

[0024] Figure 3 is a structural schematic view of the connection position of the pump shell and the bearing seat of the present application;

[0025] Figure 4 is a structural schematic view of the cross section of the pump shell of the present application;

[0026] Figure 5 is a structural schematic view of one side of the rear cover plate of the present application;

[0027] Figure 6Structure diagram of the other side of the rear cover plate of the application;

[0028] Figure 7 Structure diagram of the connecting position of the adjusting sleeve and the adjusting rod of the application;

[0029] Figure 8 Structure diagram of the connecting position of the inner and outer transmission sleeves of the application;

[0030] Figure 9 Structure diagram of the mounting position of the mounting bracket of the application;

[0031] Figure 10 Structure diagram of the mounting position of the centrifugal connecting mechanism of the application;

[0032] Figure 11 Structure diagram of the working centrifugal connecting mechanism of the application;

[0033] Figure 12 Structure diagram of the threaded connection assembly of the application after moving to the position

[0034] Figure 13 Structure diagram of the threaded connection assembly of the application.

[0035] Explanation of reference signs:

[0036] In the figure: 1, mounting base; 2, driving motor; 3, pump shell; 4, bearing seat; 5, pump shaft; 6, impeller assembly; 61, rear cover plate; 62, blade; 7, transmission mechanism; 71, outer transmission sleeve; 72, inner transmission sleeve; 73, auxiliary driving sleeve; 74, transmission chute; 8, centrifugal connecting mechanism; 81, mounting bracket; 82, centrifugal top arm; 83, reset spring one; 84, threaded connection assembly; 841, transmission plate; 842, butt joint fast; 843, reset spring two; 85, reset spring three; 9, adjusting mechanism; 91, adjusting sleeve; 92, adjusting rod; 93, positioning plug; 94, reset spring four; 95, transmission gear; 96, arc-shaped rack; 97, transmission bracket; 10, annular slide rail; 11, roller bracket. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the protection scope of the present disclosure.

[0038] Please refer to Figures 1-13The technical scheme is provided by the embodiment of the present application: a chemical process pump with impeller blade time sequence gradual change, comprising a pump shell 3, an impeller assembly 6 rotatably installed in the pump shell 3, and a pump shaft 5 for providing power for the rotation of the impeller assembly 6, wherein the impeller assembly 6 comprises movable blades 62;

[0039] Further comprising: a transmission mechanism 7 arranged on the pump shell 3 for transmitting power between the pump shaft 5 and the impeller assembly 6; a centrifugal connecting mechanism 8 arranged on the pump shaft 5 for realizing power connection between the pump shaft 5 and the transmission mechanism 7; and an adjusting mechanism 9 arranged on the impeller assembly 6 for adjusting the opening and closing of the blades 62.

[0040] After the pump shaft 5 is driven to reach the rated speed, the centrifugal connecting mechanism 8 is opened under the action of centrifugal force and realizes power connection with the transmission mechanism 7; after the centrifugal connecting mechanism 8 is connected with the transmission mechanism 7, the centrifugal connecting mechanism 8 pushes the transmission mechanism 7 to act under the rotation of the pump shaft 5, and the transmission mechanism 7 presses the adjusting mechanism 9, and the blades 62 are unfolded to the working state through the adjusting mechanism 9.

[0041] The chemical process pump with impeller blade time sequence gradual change further comprises: a bearing seat 4 fixedly installed at one end of the pump shell 3 away from the inlet; a driving motor 2 for providing power for the rotation of the pump shaft 5; a mounting base 1 for bearing the pump shell 3 and the driving motor 2; the pump shaft 5 is movably installed on the bearing seat 4, one end of the pump shaft 5 extends into the interior of the pump shell 3, and the other end is connected with the output shaft of the driving motor 2 through a shaft coupling.

[0042] Specifically, in the initial state, the blades 62 in the impeller assembly 6 are in a gathered state, and the pump shaft 5 is disconnected with the impeller assembly 6; the driving motor 2 is controlled by the control system to drive the pump shaft 5 to rotate, and the pump shaft 5 synchronously drives the centrifugal connecting mechanism 8 to rotate; as the rotation speed of the pump shaft 5 increases, the centrifugal connecting mechanism 8 is opened under the action of centrifugal force and is clamped on the transmission mechanism 7, so that the centrifugal connecting mechanism 8 and the transmission mechanism 7 realize power connection; at this time, the pump shaft 5 can drive the impeller assembly 6 to rotate through the centrifugal connecting mechanism 8 and the transmission mechanism 7, and the blades 62 are in the gathered state when the impeller assembly 6 is initially rotated; the centrifugal connecting mechanism 8 drives the transmission mechanism 7 to start rotating while synchronously driving the transmission mechanism 7 to shrink, the transmission mechanism 7 presses the adjusting mechanism 9, and the blades 62 are unfolded to the working state through the adjusting mechanism 9, and the blades 62 work in the working state; the blades 62 are gradually adjusted from the gathered state to the working state in the process of shrinking of the transmission mechanism 7; the impeller assembly 6 is initially in the gathered state, which can reduce the effective flow area of the outlet of the impeller assembly 6, reduce the work done by the blades 62 on the fluid, reduce the initial torque and the motor current peak value, reduce the starting energy consumption, the blades 62 are adjusted with time sequence gradual change, gradually match the system demand, and the energy waste caused by full load starting can be greatly avoided.

[0043] Compared with the prior art, in the initial state, the pump shaft 5 is disconnected with the impeller assembly 6, and with the increase of the rotating speed of the pump shaft 5, the blades 62 are gradually adjusted from the initial gathering state to the open working state through the transmission mechanism 7, the centrifugal connecting mechanism 8 and the adjusting mechanism 9. When the impeller assembly 6 rotates initially, the blades 62 are in the gathering state, which can reduce the effective flow area of the outlet of the impeller assembly 6, reduce the doing function of the blades 62 to the fluid, and reduce the initial torque and the peak value of the motor current, thereby reducing the starting energy consumption. The blades 62 are gradually adjusted according to the time sequence, and gradually match the system demand, so that the energy waste caused by full-load starting can be greatly avoided.

[0044] As a preferred technical scheme of the embodiment, the impeller assembly 6 further comprises a rear cover plate 61, the blades 62 are movably installed at the front end of the rear cover plate 61, and in the initial state, the blades 62 are in the gathering state at the front end of the rear cover plate 61. Specifically, the blades 62 are in the gathering state when they rotate initially, which can reduce the effective flow area of the outlet of the impeller assembly 6, reduce the doing function of the blades 62 to the fluid, and the blades 62 are gradually adjusted to the working state according to the time sequence, and gradually match the system demand, so that the energy waste caused by full-load starting can be greatly avoided.

[0045] As a preferred technical scheme of the embodiment, the transmission mechanism 7 comprises a telescopic outer transmission sleeve 71, an inner transmission sleeve 72 and an auxiliary driving sleeve 73. The auxiliary driving sleeve 73 is arranged on the pump shell 3, and the inner wall of the auxiliary driving sleeve 73 is provided with threads matched with the centrifugal connecting mechanism 8. Specifically, one end of the outer transmission sleeve 71 is fixedly connected to the rear cover plate 61, and the other end is rotatably installed in the interior of the pump shell 3. The position of the impeller assembly 6 can be limited by the outer transmission sleeve 71, so as to ensure the stability of the impeller assembly 6 during working rotation. The inner transmission sleeve 72 is clamped in the interior of the outer transmission sleeve 71. The inner wall of the outer transmission sleeve 71 is provided with a transmission sliding groove 74, and the outer wall of the inner transmission sleeve 72 is provided with a transmission sliding strip matched with the transmission sliding groove 74. The transmission sliding groove 74 and the transmission sliding strip limit the transmission of power between the outer transmission sleeve 71 and the inner transmission sleeve 72, and enable the inner transmission sleeve 72 to move axially in the interior of the outer transmission sleeve 71.

[0046] As a preferred technical solution of the embodiment, the centrifugal connecting mechanism 8 comprises a mounting bracket 81 clamped on the pump shaft 5 near one end of the impeller assembly 6, a centrifugal top arm 82 movably mounted on the peripheral side of the mounting bracket 81, when the mounting bracket 81 is rotated by the pump shaft 5, the centrifugal top arm 82 is stretched out along the outside of the mounting bracket 81 under the action of centrifugal force and clamped on the inner transmission sleeve 72, specifically, the inner ring of the mounting bracket 81 and the pump shaft 5 are provided with matching slide bars and slide grooves, so that the pump shaft 5 and the mounting bracket 81 can transmit power, and at the same time, the mounting bracket 81 can slide outside the pump shaft 5; a reset spring 83 is movably sleeved on the outside of the mounting bracket 81 and located inside the mounting bracket 81, used to drive the centrifugal top arm 82 to reset, the cross-sectional shape of the centrifugal top arm 82 and the mounting bracket 81 matching part is polygonal, avoiding axial rotation of the centrifugal top arm 82, and ensuring that the centrifugal top arm 82 can accurately match the inner transmission sleeve 72; the inner transmission sleeve 72 is provided with a clamping cavity matched with the centrifugal top arm 82, when the centrifugal top arm 82 is stretched under the action of centrifugal force, it can be clamped in the clamping cavity, realizing power connection between the centrifugal top arm 82 and the inner transmission sleeve 72, so that when the pump shaft 5 rotates to drive the centrifugal connecting mechanism 8, it can synchronously drive the transmission mechanism 7 and the impeller assembly 6 to rotate;

[0047] It should be noted that before the centrifugal pump is started, it is necessary to ensure that the pump shell is filled with liquid, otherwise the air binding phenomenon will cause the pump to fail to pump normally, so it is necessary to inject water into the pump shell before starting the centrifugal pump, but in the prior art, the pump shaft 5 and the impeller assembly 6 are in a fixed connection state, and the pump shaft 5 is in a locked state when stopped, which causes the impeller assembly 6 to be unable to rotate when injecting water, resulting in a dead angle in the pump shell, so that a small amount of air remains in the water pipe or the pump body, so that the process pump cannot start smoothly;

[0048] When the chemical process pump of the application is stopped, the centrifugal top arm 82 loses the action of centrifugal force, the centrifugal top arm 82 is reset under the action of the reset spring 83, the connection between the centrifugal connecting mechanism 8 and the transmission mechanism 7 is disconnected, and then the connection between the pump shaft 5 and the impeller assembly 6 is disconnected, so that the impeller assembly 6 can rotate freely in the stopped state, which is convenient for the liquid to drive the impeller assembly 6 to rotate when injecting water, avoiding the existence of a dead angle.

[0049] As a preferred technical solution of the embodiment, the centrifugal connecting mechanism 8 further comprises a threaded connecting assembly 84 arranged on the inner transmission sleeve 72 and corresponding to the position of the centrifugal top arm 82. When the centrifugal top arm 82 is clamped on the inner transmission sleeve 72, the threaded connecting assembly 84 is pressed by the centrifugal top arm 82, so that the threaded connecting assembly 84 is connected with the threads on the inner wall of the auxiliary driving sleeve 73. After the threaded connecting assembly 84 is connected with the threads on the inner wall of the auxiliary driving sleeve 73, when the pump shaft 5 drives the centrifugal connecting mechanism 8 and the inner transmission sleeve 72 to rotate, the inner transmission sleeve 72 can be synchronously driven to move towards the side close to the outer transmission sleeve 71. Specifically, the threaded connecting assembly 84 comprises a transmission plate 841 movably arranged in the clamping cavity of the inner transmission sleeve 72. The side of the transmission plate 841 close to the outer side of the inner transmission sleeve 72 is fixedly connected with a butt joint fastener 842. The butt joint fastener 842 is provided with a clamping groove matched with the threads on the inner wall of the auxiliary driving sleeve 73. A reset spring 843 is movably arranged on the transmission plate 841 and located in the clamping cavity, for resetting the transmission plate 841 and the butt joint fastener 842. When the pump shaft 5 drives the mounting bracket 81 and the centrifugal top arm 82 to rotate, the centrifugal top arm 82 is clamped in the clamping cavity under the action of centrifugal force, and the transmission plate 841 is pressed by the centrifugal top arm 82. The transmission plate 841 drives the butt joint fastener 842 to move towards the outer side of the inner transmission sleeve 72, so that the butt joint fastener 842 is clamped on the threads on the inner wall of the auxiliary driving sleeve 73. Thus, when the pump shaft 5 drives the mounting bracket 81, the centrifugal top arm 82 and the inner transmission sleeve 72 to rotate, the inner transmission sleeve 72 can be synchronously pushed to move towards the side close to the outer transmission sleeve 71, so as to press and adjust the adjusting mechanism 9 through the inner transmission sleeve 72. When the adjusting mechanism 9 adjusts the blades 62 to the right position, the threaded connecting assembly 84 moves to the front end of the threads on the inner wall of the auxiliary driving sleeve 73, and the connection between the threaded connecting assembly 84 and the threads on the inner wall of the auxiliary driving sleeve 73 is disconnected. During the subsequent continuous rotation of the impeller assembly 6, the threaded connecting assembly 84 rotates at this position. When the flow pump is stopped, the centrifugal top arm 82 is retracted under the action of the elastic force of the reset spring 83, the clamping of the centrifugal top arm 82 on the inner transmission sleeve 72 is released, and the restriction of the centrifugal top arm 82 on the threaded connecting assembly 84 is released. The transmission plate 841 and the butt joint fastener 842 are reset under the action of the elastic force of the reset spring 843. In this state, the butt joint fastener 842 is not connected with the threads in the auxiliary driving sleeve 73. The inner transmission sleeve 72 and the threaded connecting assembly 84 are reset by the adjusting mechanism 9, and the mounting bracket 81 and the centrifugal top arm 82 are reset by the reset spring 85.

[0050] As the preferred technical scheme of the embodiment, the adjusting mechanism 9 comprises an adjusting sleeve 91 rotatably arranged at the rear end of the rear cover plate 61, and an adjusting rod 92 arranged inside the adjusting sleeve 91 and screw-connected with the adjusting sleeve 91, and the adjusting rod 92 can drive the adjusting sleeve 91 to rotate axially when pressed from above. Specifically, the adjusting mechanism 9 further comprises a transmission bracket 97 fixedly arranged inside the inner transmission sleeve 72, and the adjusting rod 92 is fixedly sleeved outside the adjusting rod 92, so that the adjusting rod 92 can be driven to move when the inner transmission sleeve 72 is driven to move, thereby driving the adjusting sleeve 91 to rotate and providing power for the adjustment of the blade 62.

[0051] As the preferred technical scheme of the embodiment, the adjusting mechanism 9 further comprises a positioning plug rod 93 arranged inside the adjusting sleeve 91 for limiting the axial rotation of the adjusting rod 92, and a reset spring 94 sleeved outside the positioning plug rod 93 for driving the adjusting rod 92 to reset. Specifically, the positioning plug rod 93 limits the adjusting rod 92 to move only axially, and since the adjusting sleeve 91 is screw-connected with the adjusting rod 92, the adjusting sleeve 91 can be driven to rotate when the adjusting rod 92 moves axially. When the flow pump is stopped, the adjusting rod 92 can be reset by the positioning plug rod 93 applying an elastic force to the adjusting rod 92, and the inner transmission sleeve 72 can be reset by the transmission bracket 97.

[0052] As the preferred technical scheme of the embodiment, the adjusting mechanism 9 further comprises a gear set arranged at the rear end of the rear cover plate 61 for transmitting power between the blade 62 and the adjusting sleeve 91. Specifically, the gear set comprises a transmission gear 95 fixedly sleeved outside the adjusting sleeve 91, and the blade 62 is fixedly connected with a rotating shaft at one end close to the center of the rear cover plate 61, and the blade 62 is movably arranged on the rear cover plate 61 through the rotating shaft. The rotating shaft is fixedly sleeved with an arc-shaped rack 96 at the rear end of the rear cover plate 61, and the arc-shaped rack 96 is engaged with the transmission gear 95, thereby achieving the transmission connection between the adjusting sleeve 91 and the blade 62. In order to avoid interference when the arc-shaped racks 96 rotate, the arc-shaped racks 96 are arranged in multiple layers in parallel. For example, when the number of arc-shaped racks 96 is six, they are arranged in three groups in double layers.

[0053] As the preferred technical scheme of the embodiment, the inside of the pump shell 3 is provided with an annular slide rail 10, the outer side of the outer transmission sleeve 71 is provided with a roller support 11, the roller support 11 is slidingly arranged in the annular slide rail 10, and the outer transmission sleeve 71 is rotatably arranged on the pump shell 3 through the annular slide rail 10 and the roller support 11. Specifically, the outer transmission sleeve 71 and the impeller assembly 6 can stably rotate in the pump shell 3 through the annular slide rail 10 and the roller support 11. Meanwhile, the axial force generated during the operation of the impeller assembly 6 can be prevented from being transmitted to the connection between the pump shaft 5 and the pump shell through the cooperation between the roller support 11 and the annular slide rail 10. It should be noted that, in order to improve the sealing performance of the connection between the annular slide rail 10 and the outer transmission sleeve 71, a rotating sealing structure in the prior art, such as a rotating sealing ring, is arranged at the connection position of the annular slide rail 10 and the outer transmission sleeve 71.

[0054] The above only describes some exemplary embodiments of the application by way of illustration. It is self-evident that those skilled in the art can modify the described embodiments in various manners without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the application.

Claims

1. A chemical process pump with progressively changing impeller blades, comprising a pump casing (3), an impeller assembly (6) rotatably mounted inside the pump casing (3), and a pump shaft (5) for providing power for the rotation of the impeller assembly (6), characterized in that, The impeller assembly (6) includes movable blades (62); It also includes: a transmission mechanism (7), which is disposed on the pump casing (3) for transmitting power between the pump shaft (5) and the impeller assembly (6); a centrifugal connection mechanism (8), which is disposed on the pump shaft (5) for realizing the power connection between the pump shaft (5) and the transmission mechanism (7); and an adjustment mechanism (9), which is disposed on the impeller assembly (6) for adjusting the opening and closing of the blades (62). After the pump shaft (5) is driven to reach the rated speed, the centrifugal connection mechanism (8) opens under the action of centrifugal force and achieves power connection with the transmission mechanism (7); after the centrifugal connection mechanism (8) is connected to the transmission mechanism (7), under the rotation of the pump shaft (5), the centrifugal connection mechanism (8) pushes the transmission mechanism (7) to press against the adjustment mechanism (9), and the blade (62) is unfolded to the working state through the adjustment mechanism (9).

2. A chemical process pump with progressively changing impeller blades according to claim 1, characterized in that, The impeller assembly (6) also includes a rear cover plate (61), and the blades (62) are movably installed at the front end of the rear cover plate (61). In the initial state, the blades (62) are in a converged state at the front end of the rear cover plate (61).

3. A chemical process pump with progressively changing impeller blades according to claim 1, characterized in that, The transmission mechanism (7) includes a retractable outer transmission sleeve (71), an inner transmission sleeve (72), and an auxiliary drive sleeve (73). The auxiliary drive sleeve (73) is mounted on the pump housing (3), and the inner wall of the auxiliary drive sleeve (73) is provided with a thread that cooperates with the centrifugal connection mechanism (8).

4. A chemical process pump with progressively changing impeller blades according to claim 3, characterized in that, The centrifugal connection mechanism (8) includes a mounting bracket (81), which is snapped onto one end of the pump shaft (5) near the impeller assembly (6). A centrifugal top arm (82) is movably mounted on the periphery of the mounting bracket (81). When the pump shaft (5) drives the mounting bracket (81) to rotate, the centrifugal top arm (82) is subjected to centrifugal force and extends out along the outside of the mounting bracket (81) and snaps onto the inner transmission sleeve (72).

5. A chemical process pump with progressively changing impeller blades according to claim 4, characterized in that, The centrifugal connection mechanism (8) further includes a threaded connection assembly (84), which is disposed on the inner transmission sleeve (72) and corresponds to the position of the centrifugal top arm (82). When the centrifugal top arm (82) is engaged on the inner transmission sleeve (72), it presses against the threaded connection assembly (84), so that the threaded connection assembly (84) can be connected to the thread on the inner wall of the auxiliary drive sleeve (73).

6. A chemical process pump with progressively changing impeller blades according to claim 5, characterized in that, After the threaded connection assembly (84) is threadedly connected to the inner wall of the auxiliary drive sleeve (73), when the pump shaft (5) drives the centrifugal connection mechanism (8) and the inner drive sleeve (72) to rotate, the inner drive sleeve (72) can be driven to move towards the side closer to the outer drive sleeve (71) in sync.

7. A chemical process pump with progressively changing impeller blades according to claim 2, characterized in that, The adjustment mechanism (9) includes an adjustment sleeve (91), which is rotatably mounted on the rear end of the rear cover plate (61); and an adjustment rod (92), which is disposed inside the adjustment sleeve (91) and is spirally connected to the adjustment sleeve (91); when the adjustment rod (92) is subjected to top pressure, it can drive the adjustment sleeve (91) to rotate axially.

8. A chemical process pump with progressively changing impeller blades according to claim 7, characterized in that, The adjustment mechanism (9) also includes a positioning rod (93), which is located inside the adjustment sleeve (91) and is used to limit the axial rotation of the adjustment rod (92); and a reset spring (94), which is fitted outside the positioning rod (93) and is used to drive the adjustment rod (92) to reset.

9. A chemical process pump with progressively changing impeller blades according to claim 8, characterized in that, The adjustment mechanism (9) also includes a gear set located at the rear end of the rear cover plate (61) for transmission between the blade (62) and the adjustment sleeve (91).

10. A chemical process pump with progressively changing impeller blades according to claim 3, characterized in that, The pump casing (3) is provided with an annular slide rail (10) inside, and the outer transmission sleeve (71) is provided with a roller bracket (11) on its periphery. The roller bracket (11) is slidably disposed in the annular slide rail (10). The outer transmission sleeve (71) is rotatably mounted on the pump casing (3) through the annular slide rail (10) and the roller bracket (11).

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