Grinding head group of vacuum pulverizing pump and vacuum pulverizing pump

Abstract

The application discloses a grinding head group of a vacuum pulverizing pump and the vacuum pulverizing pump. The grinding head group comprises a grinding roller and a grinding ring. A plurality of semicircular conical flow channels are arranged around the grinding roller. An outer grinding surface is arranged between every two adjacent semicircular conical flow channels. A plurality of first tooth-shaped annular grooves are arranged on the outer grinding surface. A flow channel bottom hole is arranged at the tail end of the semicircular conical flow channel. The semicircular conical flow channel and the flow channel bottom hole are arranged in a ring matrix along the central axis of the grinding roller. The grinding ring comprises an inner grinding surface corresponding to the outer grinding surface and a flow channel hole corresponding to the flow channel bottom hole. The flow channel hole forms a notch on the inner circle of the grinding ring. The inner grinding surface is located on the inner circle of the grinding ring. A second tooth-shaped annular groove is arranged on the inner grinding surface and matched with the first tooth-shaped annular groove.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of comminution cutter components for vacuum comminution pump, in particular discloses a grinding head group of vacuum comminution pump and vacuum comminution pump. BACKGROUND

[0002] At present, the market has the function of comminution vacuum pump, hereinafter referred to as vacuum comminution pump. Generally adopt dynamic knife and static knife to form the form of comminution cutter group. There are problems of low comminution efficiency, fast wear of cutter head, large pump vibration, high noise, which can be tolerated in industrial sites. But in the marine environment, high comminution efficiency, low running noise, compact structure, safe and reliable are particularly important.

[0003] For vacuum comminution pump, there are different transmission types, generally adopt ordinary motor for land use, motor shaft is connected with pump shaft by coupling. The vacuum comminution pump of this structure has the advantages of adopting standard motor, through elastic coupling transition, and then connecting with pump. The requirements for pump shaft, comminution cutter group and other components are lower, and the pump running vibration and noise are smaller. But it has the problems of large volume and weight, high cost and price, especially the problems of volume and weight, which are not suitable for ships and high-speed trains and other equipment.

[0004] The current leading technology of marine vacuum comminution pump has adopted a special motor. The motor shaft and the pump shaft are made into one body, which is a long shaft output by the motor. The motor is a flange type without base structure, and the main pump shell is provided with a base for sharing by the whole pump. The motor without base is installed in cantilevered manner through flange and pump body, so that the structure of vacuum comminution pump is more compact, which is suitable for application in sewage treatment and other places. But when sucking liquid containing solid matter such as domestic sewage, not only vacuum is needed, but also the contained solid matter needs to be broken to increase the flowability for easy vacuum suction and transportation.

[0005] The comminution function of the current market vacuum comminution pump is realized by comminution cutter group. The typical type is fixed static cutter and dynamic cutter head. The fixed static cutter is located downstream of the impeller, and the dynamic cutter head is arranged on the impeller. The number of dynamic cutter head is only one. When the impeller rotates, the dynamic cutter head on the impeller and the three static cutter heads distributed along the circumference of the static cutter perform shearing. The dynamic cutter head on the impeller and the three static cutter heads have close contact once per revolution of the impeller, that is, when the medium flows through the gap between the impeller and the static cutter, the impeller will have three shearing opportunities per revolution, which completes the comminution of solid material. But the shearing gap between the dynamic cutter head and the static cutter head changes with the rotation of the impeller. When the gap is large, part of the solid material will flow without shearing, which causes low comminution rate and fineness, and also affects the vacuum suction capacity of the pump. SUMMARY

[0006] The object of the present application is to overcome the defects in the prior art, and provide a grinding head group of a vacuum pulverizing pump and the vacuum pulverizing pump, which are high in pulverizing efficiency, economical and practical, and improve the operation efficiency and vacuum suction capacity of the vacuum pulverizing pump.

[0007] The present application is implemented as follows: a grinding head group of a vacuum pulverizing pump, comprising a grinding roller and a grinding ring, a plurality of semi-conical flow channels are arranged around the grinding roller, an outer grinding surface is arranged between every two adjacent semi-conical flow channels, a plurality of first tooth-shaped annular grooves are arranged on the outer grinding surface, a flow channel bottom hole is arranged at the tail end of the semi-conical flow channel, and the semi-conical flow channels and the flow channel bottom holes are arranged in a ring matrix along the central axis of the grinding roller.

[0008] The grinding ring comprises an inner grinding surface corresponding to the outer grinding surface and a flow channel hole corresponding to the flow channel bottom hole, the flow channel hole forms a notch on the inner circle of the grinding ring, the inner grinding surface is located on the inner circle of the grinding ring, and a second tooth-shaped annular groove is arranged on the inner grinding surface and matched with the first tooth-shaped annular groove.

[0009] The front edges of every two adjacent semi-conical flow channels are connected, and the outer grinding surface is located between the rear portions of every two adjacent semi-conical flow channels.

[0010] The tooth height and tooth width of the first tooth-shaped annular groove of the outer grinding surface are 1-1.5 mm, and the spacing between every two adjacent transverse first tooth-shaped annular grooves is 2-3 mm.

[0011] The center of the grinding roller is provided with a counterbore.

[0012] A positioning flange is arranged on the rear end bottom surface of the grinding roller, and a pin hole is arranged on one side of the positioning flange.

[0013] A plurality of forward protruding inner grinding sharp corners are arranged at the front end of the inner grinding surface.

[0014] A vacuum pulverizing pump with the grinding head group of the vacuum pulverizing pump as described above, comprising a feeding cavity, a vacuum suction cavity, a discharging cavity and a motor connected in sequence, a impeller is arranged in the vacuum suction cavity, the output shaft of the motor penetrates the discharging cavity, enters the vacuum suction cavity, penetrates the impeller and is connected with the grinding roller of the grinding head group, a pump inlet is arranged above the feeding cavity, a check valve plate is arranged between the pump inlet and the feeding cavity, a cavity dividing wall is arranged between the feeding cavity and the vacuum suction cavity, a grinding head group mounting hole is arranged on the cavity dividing wall, the grinding roller of the grinding head group is located in the grinding head group mounting hole, the rear end of the grinding roller is connected with the front end of the impeller, the grinding ring is sleeved outside the grinding roller, the grinding ring is located in the feeding cavity and is fixed on the cavity dividing wall.

[0015] The grinding roller, impeller, and motor output shaft are located on the same central axis, and the central axis is lower than the center line of the vacuum suction chamber.

[0016] The rear end of the grinding roller is connected to the impeller via a flexible cylindrical pin.

[0017] A mechanical shaft seal is provided on the motor output shaft located in the discharge chamber.

[0018] The beneficial effects of this invention are as follows: the grinding rollers and grinding rings of the grinding head assembly adopt independent structures, which can fully crush and grind solids in the liquid medium, thereby improving the crushing rate of the pump. The grinding head assembly transforms the medium containing solid substances into a liquid with better fluidity, improving operating efficiency and vacuum suction capacity. The pump structure is optimized, with high crushing and grinding efficiency and strong vacuum suction capacity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the vacuum pulverizing pump of the present invention.

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure on the left side.

[0021] Figure 3 This is a schematic diagram showing the structural relationship between the grinding head assembly, the feeding chamber, and the vacuum suction chamber of the vacuum pulverizing pump of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the grinding roller of the grinding head assembly of the present invention.

[0023] Figure 5 This is a front view of the grinding roller of the grinding head assembly of the present invention.

[0024] Figure 6 yes Figure 5 AA sectional view.

[0025] Figure 7 This is a schematic diagram of the grinding ring structure of the grinding head assembly of the present invention.

[0026] Figure 8 This is a comfort diagram of the grinding ring of the grinding head assembly of the present invention.

[0027] Figure 9 yes Figure 8 BB cross-sectional view.

[0028] The components include: 1. Pump inlet; 2. Check valve plate; 3. Feed chamber; 4. Grinding roller; 5. Grinding ring; 6. Impeller; 7. Vacuum suction chamber; 8. Discharge chamber; 9. Pump outlet; 10. Mechanical shaft seal; 11. Motor; 12. Chamber wall; 13. Output shaft; 14. Flexible cylindrical pin.

[0029] 21, semi-conical flow channel; 22, flow channel bottom hole; 23, outer grinding surface; 24, counterbore; 25, positioning flange; 26, pin hole; 27, first toothed annular groove;

[0030] 31, inner grinding surface; 32, flow channel hole; 33, grinding ring mounting hole; 34, inner grinding sharp corner; 35, second toothed annular groove. DETAILED DESCRIPTION

[0031] According to Figures 4-9 , the present application is a kind of vacuum pulverizer pump's grinding head group, including grinding roller 4 and grinding ring 5, the four around grinding roller 4 It is equipped with several semi-conical flow channels 21, the semi-conical flow channel 21 is along the outer circle of grinding roller 4 Milling is formed. The number of semi-conical flow channel 21 is 4-6, preferably 5, every two adjacent semi-conical flow channel 21 It is equipped with outer grinding surface 23, the outer grinding surface 23 is the remaining outer circle of the cylinder where grinding roller 4 is located minus semi-conical flow channel 21. Specifically, the front edge of every two adjacent semi-conical flow channel 21 meets, and the outer grinding surface 23 is located between the rear of every two adjacent semi-conical flow channel 21. The outer grinding surface 23 is equipped with several first toothed annular grooves 27, the first toothed annular groove 27 of outer grinding surface 23 The tooth height and tooth width are 1-1.5mm respectively, and the spacing between every two adjacent transverse first toothed annular grooves 27 is 2-3mm. The tail end of semi-conical flow channel 21 is equipped with flow channel bottom hole 22, and semi-conical flow channel 21 and flow channel bottom hole 22 are arranged in annular matrix along the central axis of grinding roller 4, forming the flow channel of medium and vacuum suction at the grinding roller 4. The center of grinding roller 4 is equipped with counterbore 24, and grinding roller 4 is fixed on the front end of output shaft 13 of motor 11 through counterbore 24. The rear end bottom surface of grinding roller 4 is equipped with positioning flange 25, which is matched with the concave edge of impeller 6, so as to ensure the coaxiality of grinding roller 4, impeller 6 and motor 11. One side of positioning flange 25 is located on the rear end bottom surface of grinding roller 4 and is equipped with pin hole 26. The pin hole 26 is connected with another impeller pin hole on the impeller 6 through the elastic cylindrical pin, so that the grinding roller 4 and the impeller 6 are synchronized.

[0032] The grinding ring 5 comprises an inner grinding surface 31 corresponding to the outer grinding surface 23 and a flow channel hole 32 corresponding to the flow channel bottom hole 22. The grinding ring 5 is in the shape of a flat cylinder. The flow channel hole 32 is a notch formed on the inner circle of the grinding ring 5. The flow channel hole 32 is preferably a semi-cylindrical waist hole. The position of the flow channel hole 32 corresponds to the conical surface and the bottom hole 22 of the semi-conical flow channel 21 to ensure the flow of medium and the generation of vacuum. The inner grinding surface 31 is located on the inner circle of the grinding ring 5. The inner grinding surface 31 is provided with a second toothed annular groove 35 matched with the first toothed annular groove 27. The size of the second toothed annular groove 35 matches the toothed groove of the grinding roller 4. The inner grinding surface 31 of the grinding ring 5 is matched with the outer grinding surface 23 of the grinding roller 4 to grind and refine the solid matter in the flowing medium. The front end of the inner grinding surface 31 is provided with a plurality of forward protruding inner grinding sharp corners 34. The number of the inner grinding sharp corners 34 corresponds to the number of the inner grinding surface 31. The inner grinding sharp corners 34 solve the problem of crushing large materials before grinding. When the medium flows through the flow channel composed of the grinding roller 4 and the grinding ring 5, the larger solid matter in the medium is first sheared and crushed by the inner grinding sharp corners 34. Then the medium containing finer solid matter flows through the grinding head group composed of the outer grinding surface 23 of the grinding roller 4 and the inner grinding surface 31 of the grinding ring 5 to grind the solid matter in the medium and realize the full flowability of the medium.

[0033] According to Figures 1-3 , in combination Figures 4-9 , the vacuum crushing pump with the grinding head group as described above comprises a feed chamber 3, a vacuum suction chamber 7, a discharge chamber 8 and a motor 11 connected in sequence. The vacuum suction chamber 7 is provided with an impeller 6. The output shaft 13 of the motor 11 penetrates the discharge chamber 8 from back to front into the vacuum suction chamber 7 and penetrates the impeller 6 to be connected with the grinding roller 4 of the grinding head group. The mechanical shaft seal 10 is arranged on the output shaft 13 in the discharge chamber 8. The mechanical shaft seal 10 dynamically seals the medium in the pump from the output shaft 13 of the motor 11 to prevent the medium from penetrating into the motor 11. The upper end of the discharge chamber 8 is provided with a pump outlet 9. The upper part of the feed chamber 3 is provided with a pump inlet 1. The pump inlet 1 and the feed chamber 3 are provided with a check valve plate 2. The feed chamber 3 and the vacuum suction chamber 7 are provided with a partition wall 12. The partition wall 12 is provided with a grinding head group mounting hole. The grinding roller 4 of the grinding head group is located in the grinding head group mounting hole. The rear end of the grinding roller 4 is connected with the front end of the impeller 6 through the elastic cylindrical pin 14. The grinding ring 5 is sleeved outside the grinding roller 4. The grinding ring 5 is provided with a grinding ring mounting hole 33. The grinding ring 5 is located in the feed chamber 3 and is fixed on the partition wall 12 through the grinding ring mounting hole 33 and the fixing screw.

[0034] The output shaft 13 of the mill roller 4, the impeller 6 and the motor 11 is located on the same central axis, and the central axis is lower than the center line of the vacuum suction cavity 7.

[0035] The output shaft 3 of the motor 11 of the application is directly connected with the impeller and the mill head group as the pump shaft respectively, and in the case of the same power, not only the structure is more compact, but also the crushing efficiency of the solid matter in the liquid containing solid matter is improved, the flowability is increased, the vacuum suction degree is improved, and the conveying capacity is improved.

[0036] When the application is used, the medium to be ground enters the feed chamber 3 from the pump inlet 1, is broken and ground by the mill head group after being pumped and vacuum suctioned by the impeller 6, flows through the vacuum suction cavity 7, and then passes through the discharge chamber 8, the pump outlet 9, and is sent to the vacuum collection cabinet through the pipeline, so that the vacuum collection and conveying of the medium are completed.

[0037] The mill head group of the application can completely crush the solid matter of the medium, and improves the vacuum suction capacity of the pump and the vacuum degree of the working system. After more than two years of research and development verification and comparison, the vacuum crushing pump loaded with the mill head group of the application is obviously better than similar products in various performances, and has a good application prospect.

[0038] Comparison table of main technical performance indexes of existing similar products and the vacuum crushing pump of the application.

[0039] Technical parameters Existing similar products The present invention Performance comparison Pump motor power Standard motor 3kW Motor 3kW Same power Average degree of pulverization 90.26 95.63 ↑6.0% Maximum vacuum degree 73% 82% ↑12.3% Processing capacity 19.5 26.0 ↑33.3% Rated air extraction volume @ -4 bar 10.4 14.1 ↑35.6% Rated displacement volume @ 3 m 9.2 11.8 ↑28.3%

[0040] As shown in the above table, the vacuum crushing pump with the mill head group of the application has a great improvement in the average crushing degree, the maximum vacuum degree, the processing capacity, the rated air suction amount and the rated water discharge amount.

Claims

1. A grinding head assembly for a vacuum pulverizing pump, characterized in that: The device includes a grinding roller and a grinding ring. The grinding roller has several semi-conical flow channels around its perimeter. An outer grinding surface is provided between each pair of adjacent semi-conical flow channels. Several first tooth-shaped annular grooves are provided on the outer grinding surface. A flow channel bottom hole is provided at the tail end of each semi-conical flow channel. The semi-conical flow channels and the flow channel bottom hole are arranged in a circular matrix along the central axis of the grinding roller. The grinding ring includes an inner grinding surface corresponding to the outer grinding surface and a flow channel hole corresponding to the bottom hole of the flow channel. The flow channel hole forms a notch on the inner circle of the grinding ring. The inner grinding surface is located on the inner circle of the grinding ring. The inner grinding surface is provided with a second toothed annular groove that cooperates with the first toothed annular groove. The front edges of each pair of adjacent semi-conical flow channels are connected, and the outer grinding surface is located between the rear parts of each pair of adjacent semi-conical flow channels; the front end of the inner grinding surface is provided with a number of forward-protruding inner grinding tips.

2. The grinding head assembly of a vacuum pulverizing pump according to claim 1, characterized in that: The tooth height and tooth width of the first tooth-shaped annular groove on the outer grinding surface are 1-1.5 mm, and the distance between each two adjacent transverse first tooth-shaped annular grooves is 2-3 mm.

3. The grinding head assembly of a vacuum pulverizing pump according to claim 1, characterized in that: The grinding roller has a countersunk hole at its center.

4. The grinding head assembly of a vacuum pulverizing pump according to claim 1, characterized in that: The grinding roller has a positioning flange on its rear end bottom surface, and one side of the positioning flange has a pin hole on the rear end bottom surface of the grinding roller.

5. A vacuum pulverizing pump with a grinding head assembly according to claim 1, characterized in that: The device includes a feed chamber, a vacuum suction chamber, a discharge chamber, and a motor connected in sequence. An impeller is installed inside the vacuum suction chamber. The output shaft of the motor passes through the discharge chamber, enters the vacuum suction chamber, passes through the impeller, and connects to the grinding roller of the grinding head assembly. A pump inlet is located above the feed chamber. A check valve plate is installed between the pump inlet and the feed chamber. A partition wall is provided between the feed chamber and the vacuum suction chamber. A grinding head assembly mounting hole is provided on the partition wall. The grinding roller of the grinding head assembly is located within the mounting hole, and its rear end is connected to the front end of the impeller. A grinding ring is sleeved outside the grinding roller and is located inside the feed chamber and fixed to the partition wall.

6. The vacuum pulverizing pump with a grinding head assembly according to claim 5, characterized in that: The grinding roller, impeller, and motor output shaft are located on the same central axis, and the central axis is lower than the center line of the vacuum suction chamber.

7. The vacuum pulverizing pump with a grinding head assembly according to claim 5, characterized in that: The rear end of the grinding roller is connected to the impeller via a flexible cylindrical pin.

8. The vacuum pulverizing pump with a grinding head assembly according to claim 5, characterized in that: A mechanical shaft seal is provided on the motor output shaft located in the discharge chamber.

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