Vertical cantilever defoaming submerged pump capable of running in no-load mode

Abstract

The invention discloses a vertical cantilever no-load operation defoaming submerged pump which is characterized by comprising a bearing frame and a shaft, a rotor component is mounted on the shaft, a motor for driving the shaft to rotate is mounted on the bearing frame, a supporting component is mounted at the lower end of the bearing frame, the lower end of the shaft penetrates through the supporting component and extends to the lower end, and a pump body is mounted at the lower end of the supporting component. The impeller and the impeller bolt which are connected with the shaft are installed in the pump body, the liquid outlet connecting pipe is installed on the pump body, the first exhaust hole is formed in a hub of the impeller, the second exhaust hole is formed in the supporting component, and due to the special design of the impeller, gas at an inlet of the impeller can be smoothly exhausted, gas gathering is avoided, and it is guaranteed that the pump operates at a normal working condition point; due to the design of a bearing frame cantilever type rigid shaft, the axial force and the radial force are both borne by an angular contact ball bearing and a cylindrical roller bearing, the shaft deflection is small, the lower end is not supported by a guide bearing, no-load operation of the pump and integrated design of supporting components can be achieved, the weight of the pump is effectively reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and specifically relates to a vertical cantilever defoaming submersible pump capable of no-load operation. Background Art

[0002] In recent years, with the rapid development of the chemical industry, issues related to centrifugal pumps have been constantly raised. Traditional impellers utilize a closed structure, which creates bubbles between the blades and the upper and lower covers during operation and is difficult to effectively remove. As operation increases, the impeller's efficiency gradually decreases due to the accumulation of gas at the blade inlet. Alternatively, semi-open impellers are unable to balance axial forces, resulting in excessive pump stress, bearing heating, or pumping failure.

[0003] When a vertical submersible centrifugal pump is conveying a gas-containing medium, the gas discharge channel is blocked by the liquid medium on the upper end of the impeller hub, so that the gas in the medium cannot be effectively discharged. Eventually, a large amount of gas gathers at the impeller inlet and forms an air cavity at the impeller inlet, isolating the medium from the impeller blades. As a result, the pump is running but working at no load, seriously affecting production. At the same time, because the pump is running at no load, the guide bearing cannot be effectively lubricated, causing damage to the pump. Summary of the Invention

[0004] The object of the present invention is to provide a vertical cantilever defoaming submersible pump capable of no-load operation, so as to solve the problems of gas accumulation, no-load operation and unbalanced axial force proposed in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a vertical cantilever defoaming liquid pump that can be operated at no load, comprising a bearing frame and a shaft, a rotor component being mounted on the shaft, a motor for driving the shaft to rotate being mounted on the bearing frame, a support component being mounted on the lower end of the bearing frame, the lower end of the shaft extending through the support component to the lower end, a pump body being mounted on the lower end of the support component, an impeller and impeller bolts connected to the shaft being mounted in the pump body, a liquid outlet pipe being mounted on the pump body, an exhaust hole 1 being provided on the hub of the impeller, and an exhaust hole 2 being provided on the support component.

[0006] Preferably, the impeller has a semi-open structure, and the impeller back blades have the same geometric shape as the main blades and are evenly distributed. The main blades overlap with the back blades, and the number of back blades is twice the number of main blades. The length of the back blade between the two back blades overlapping with the main blades is 2 / 3 of the length of the main blade, and the width is 1 / 2 of the width of the main blade. The back blades have the same rotation direction as the main blades.

[0007] Preferably, the number of the exhaust holes 1 is the same as the number of the main blades of the impeller, and the main blades and the exhaust holes 1 are spaced apart on the hub of the impeller.

[0008] Preferably, the rotor components include a round nut, a retaining washer, an angular contact ball bearing and a cylindrical roller bearing;

[0009] The round nut, retaining washer and angular contact ball bearing are installed on the upper end of the shaft, and the axial positioning of the angular contact ball bearing is performed by installing the upper bearing gland installed on the bearing frame;

[0010] The cylindrical roller bearing is installed on the shaft and corresponds to the lower end of the bearing frame, and the axial positioning of the cylindrical roller bearing is achieved through the lower bearing gland installed at the lower end of the bearing frame.

[0011] Preferably, the number of the second exhaust holes is four, and they are evenly distributed on the same horizontal line of the supporting component.

[0012] Preferably, a sealing component is installed at the upper end of the second exhaust hole corresponding to the support component and the shaft.

[0013] Preferably, the inner hole of the impeller hub and the lower end of the shaft are both trapezoidal threads for positioning and transmitting torque.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the special design of the impeller can discharge the gas at the impeller inlet smoothly, avoid gas accumulation, ensure the pump operates at the normal working point, and effectively reduce the axial force;

[0015] The bearing frame adopts cantilever rigid shaft design. The axial and radial forces are both borne by angular contact ball bearings and cylindrical roller bearings. The shaft deflection is small and there is no guide bearing support at the lower end, which enables the pump to operate without load.

[0016] The integrated design of supporting components effectively reduces the weight of the pump and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the impeller structure of the present invention.

[0019] In the figure: 1 pump body, 2 support component, 3 sealing component, 4 lower bearing cover, 5 bearing frame, 6 upper bearing cover, 7 motor, 8 coupling, 9 round nut, 10 retaining washer, 11 angular contact ball bearing, 12 shaft, 13 cylindrical roller bearing, 14 liquid outlet pipe, 15 impeller, 16 impeller bolt, 17 exhaust hole 1, 18 exhaust hole 2. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-2 The present invention provides a technical solution: a vertical cantilever defoaming liquid pump that can operate at no load, comprising a bearing frame 5 and a shaft 12, wherein a rotor component is mounted on the shaft 12, a motor 7 for driving the shaft 12 to rotate is mounted on the bearing frame 5, a support component 2 is mounted at the lower end of the bearing frame 5, the lower end of the shaft 12 passes through the support component 2 and extends to the lower end, a pump body 1 is mounted at the lower end of the support component 2, and an impeller 15 and an impeller bolt 16 connected to the shaft 12 are mounted in the pump body 1, a liquid outlet pipe 14 is mounted on the pump body 1, an exhaust hole 17 is opened on the hub of the impeller 15, and an exhaust hole 2 18 is opened on the support component.

[0022] The round nut 9, stop washer 10, angular contact ball bearing 11 and cylindrical roller bearing 13 are installed on the shaft 12 to form a rotor component. The rotor component, lower bearing cover 4, upper bearing cover 6 and motor 7 are installed on the bearing frame 5. After the sealing component 3 is installed on the support component 2, the support component 2 is connected to the bearing frame 5, and then the impeller 15 and the impeller bolt 16 are fixed to the lower end of the shaft 12 in sequence. The liquid outlet pipe 14 is welded to the pump body 1 and connected to the interior. The upper end of the liquid outlet pipe 14 is fixed to the support component 2 and inserted into the support component, and the liquid outlet pipeline is sealed by an O-ring.

[0023] A sealing component 3 is installed at the upper end of the second exhaust hole 18 between the support component 2 and the shaft 12, and the volatile gas is sealed by the sealing component 3.

[0024] The sealing component 3 can be a mechanical seal or a packing seal.

[0025] like Figure 2 As shown, the impeller 15 has a semi-open structure. The back blades of the impeller 15 have the same geometric shape as the main blades and are evenly distributed. The main blades overlap with the back blades, and the number of back blades is twice the number of main blades. The length of the back blade between the two back blades that overlap with the main blades is 2 / 3 of the length of the main blade, and the width is 1 / 2 of the width of the main blade. The back blades have the same rotation direction as the main blades.

[0026] The number of the exhaust holes 17 is the same as the number of the main blades of the impeller 15 , and the main blades and the exhaust holes 17 are spaced apart on the hub of the impeller 15 .

[0027] The rotor components include a round nut 9, a retaining washer 10, an angular contact ball bearing 11 and a cylindrical roller bearing 13;

[0028] The round nut 9, retaining washer 10, and angular contact ball bearing 11 are installed on the upper end of the shaft, and the axial positioning of the angular contact ball bearing 11 is installed by the upper bearing gland 7 installed on the bearing frame 5;

[0029] The cylindrical roller bearing 13 is mounted on the shaft and corresponds to the lower end of the bearing frame. The cylindrical roller bearing 13 is axially positioned by the lower bearing gland 4 mounted on the lower end of the bearing frame 5.

[0030] The number of the second exhaust holes 18 is four and they are evenly distributed on the same horizontal line of the supporting component 2 .

[0031] The shaft 12, the support member 2 and the impeller 15 are not supported by guide bearings.

[0032] The inner hole of the impeller 15 hub and the shaft 12 are both designed as trapezoidal threads, which are used for positioning and transmitting torque.

[0033] Working principle: When the pump is working, the main blades of the impeller 15 pump the medium to the liquid outlet pipe 14, and the back blades balance the axial force. At the same time, the liquid medium that blocks the gas discharge from the back of the impeller 15 is discharged from the liquid outlet pipe 14 by the back blades. The gas in the medium that is not discharged from the main blades to the liquid outlet pipe 14 passes through the exhaust hole 17 and is finally discharged from the exhaust hole 2 18 on the support component 2, so that the gas in the medium cannot form an air cavity at the impeller inlet and the medium and blades are isolated, ensuring that the pump operates at the normal operating point. The bearing frame 5 has a cantilever rigid shaft design. The axial force and radial force of the shaft 12 are borne by the angular contact ball bearing 11 and the cylindrical roller bearing 13. The deflection of the lower end of the shaft is small and there is no guide bearing support, so the pump can operate at no-load.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A vertical cantilever defoaming submersible pump capable of no-load operation, characterized by: It includes a bearing frame and a shaft, a rotor component is installed on the shaft, a motor for driving the shaft to rotate is installed on the bearing frame, a support component is installed at the lower end of the bearing frame, the lower end of the shaft passes through the support component and extends to the lower end, a pump body is installed at the lower end of the support component, and an impeller and impeller bolts connected to the shaft are installed in the pump body, a liquid outlet pipe is installed on the pump body, an exhaust hole 1 is opened on the hub of the impeller, and an exhaust hole 2 is opened on the support component.

2. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 1 is characterized in that: The impeller has a semi-open structure. The impeller's back blades have the same geometric shape as the main blades and are evenly distributed. The main blades overlap with the back blades, and the number of back blades is twice the number of main blades. The length of the back blade between the two overlapping back blades is 2 / 3 of the main blade's length, and the width is 1 / 2 of the main blade's width. The back blades have the same rotation direction as the main blades.

3. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 1 is characterized in that: The number of the exhaust holes 1 is the same as the number of the main blades of the impeller, and the main blades and the exhaust holes 1 are spaced apart on the hub of the impeller.

4. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 1 is characterized in that: The rotor components include a round nut, a retaining washer, an angular contact ball bearing and a cylindrical roller bearing; The round nut, retaining washer and angular contact ball bearing are installed on the upper end of the shaft, and the axial positioning of the angular contact ball bearing is performed by installing the upper bearing gland installed on the bearing frame; The cylindrical roller bearing is installed on the shaft and corresponds to the lower end of the bearing frame, and the axial positioning of the cylindrical roller bearing is achieved through the installation of a lower bearing gland installed at the lower end of the bearing frame.

5. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 1 is characterized in that: The number of the second exhaust holes is four and they are evenly distributed on the same horizontal line of the supporting component.

6. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 5 is characterized in that: A sealing component is installed between the support component and the shaft at the upper end corresponding to the second exhaust hole.

7. The vertical cantilever defoaming submersible pump capable of no-load operation according to claim 1 is characterized in that: The inner hole of the impeller hub and the lower end of the shaft are both trapezoidal threads for positioning and transmitting torque.

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