Centrifugal pump special for machine tool waste residue filtering system

Abstract

The utility model discloses a centrifugal pump special for a machine tool waste residue filtering system, and relates to the field of centrifugal pumps, the centrifugal pump comprises a motor, a support, a pump cover, an impeller and a pump shell, the motor is supported on the pump cover through the support, a motor shaft extends into the pump cover after penetrating through the support and is connected with and drives the impeller, the pump cover is installed on the pump shell, and the impeller is located between the pump cover and the pump shell; a gap cavity A is formed between the pump cover and the impeller, a gap cavity B is formed between a front cover plate of the impeller and the pump shell, back blades are arranged on the surface of a rear cover plate of the impeller and used for being matched with the inner wall of the pump shell and preventing waste residues from entering the gap cavity B, and circumferential reinforcing ribs are arranged on the surface of the front cover plate of the impeller and used for being matched with the inner wall of the pump cover and preventing the waste residues from entering the gap cavity A. The device can be used for a machine tool cutting fluid filtering circulating system and a machine tool slag cleaning and filtering system, and the purposes of conveying solid particles and preventing the particles from being deposited to cause clamping stagnation are achieved through the structural design and the hydraulic design.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of centrifugal pump, concretely relates to a centrifugal pump special for machine tool waste residue filtering system, and particularly relates to a centrifugal pump applied to the working condition of needing to discharge residue (iron filings, oxide skin and other solid particles) in machine tool sewage treatment. BACKGROUND

[0002] It is well known that most machine tools have a chip liquid circulating system, and iron filings, oxide skin and other particles generated in the machining process flow into the collecting pool together with the chip liquid. The water pump used under this working condition can only transport the cutting fluid and cannot transport the waste residue. After a long time of accumulation, the waste residue needs to be cleaned manually, otherwise the water pump inlet will be blocked, the cutting fluid circulating system will be interrupted, and adverse consequences will be caused.

[0003] In particular, the existing machine tool cutting fluid circulating treatment process uses an ordinary centrifugal pump to suck the waste residue to a certain mesh screen, the waste residue is filtered out by the screen, and further filtering is performed through the accumulation of the waste residue, so that the particle size of the solid particles in the backflow chip liquid is reduced as much as possible, the purpose of automatically cleaning the machine tool waste residue and cleaning the chip liquid is achieved. However, the centrifugal pump used in this process is not specially designed for this working condition, and the flow channel is still blocked, the mechanical seal is leaked due to wear caused by solid particles, and the rotating parts are stuck in the pump cavity after the pump is stopped. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the deficiencies in the prior art and providing a centrifugal pump special for machine tool waste residue filtering system, which has the advantages of high passability and difficulty in blocking.

[0005] The utility model aims at overcoming the deficiencies in the prior art and providing a centrifugal pump special for machine tool waste residue filtering system, which has the advantages of high passability and difficulty in blocking.

[0006] As a further technical scheme, the lower part of the support is placed in the liquid collecting tank, and the upper part of the support is in contact with and sealed to the mounting plane of the liquid collecting tank.

[0007] As a further technical scheme, the surface of the upper part of the support in contact with the mounting plane is provided with a rubber sealing element.

[0008] As a further technical solution, a plurality of liquid discharge holes are formed in the side wall of the bracket, and the liquid leaked from the pump cover is returned to the liquid collecting tank through the liquid discharge holes.

[0009] As a further technical solution, a water blocking ring is mounted on the upper end of the motor shaft.

[0010] As a further technical solution, the pump shell adopts a semi-spiral compression chamber, the lower end of the pump shell is provided with a horn-shaped suction inlet, and one side of the pump shell is provided with a discharge outlet connected with a discharge pipeline.

[0011] As a further technical solution, the lower end of the pump shell is provided with an anti-fool foot.

[0012] As a further technical solution, the number of blades of the impeller is 2-3.

[0013] The beneficial effects of the utility model are:

[0014] 1. The impeller and the pump shell are designed according to the design method of the sewage pump, the flow passage size is increased, and the passability is ensured;

[0015] 2. The pump shell is designed by adopting a semi-spiral compression chamber method, and compared with a ring-shaped compression chamber (higher passability), the semi-spiral compression chamber has lower radial force, and compared with a spiral compression chamber (smaller radial force), the semi-spiral compression chamber has higher passability;

[0016] 3. The wall thickness of the pump shell is increased, the anti-wear ability under the condition of conveying solid particles is improved, and the corrosion allowance of the conveying medium is considered;

[0017] 4. The number of blades of the impeller is 2-3, the passability of the impeller flow passage is ensured, the water pump suction performance is improved by adjusting the blade inlet angle; the impeller adopts a non-overload water power design, the power is not overrated under the condition of large flow, the adjusting valve is not needed to be installed in the whole system, the passability is improved from the system level; the impeller is designed to increase the circular angle of the blade and the front and rear cover plates, the thickness of the blade and the wall thickness of the cover plate are increased, the anti-wear ability of the rotating part is improved, and the corrosion allowance of the conveying medium is considered;

[0018] 5. The back blade is designed on the rear cover plate of the impeller, and a circumferential reinforcing rib is designed on the front cover plate to block the waste residue from entering the side wall gap A and the side wall gap B, and prevent the material from being accumulated and stuck after the pump is stopped;

[0019] 6. When the back blade rotates synchronously with the impeller, negative pressure is generated in the gap cavity A, the liquid flow is ensured to flow from the outside of the pump cover to the inside of the pump cover, and leakage is avoided, so that sealing is realized;

[0020] 7. The centrifugal pump is an immersed centrifugal pump, the whole machine is installed on the liquid collecting tank of the machine tool equipment, a slight amount of liquid leakage is allowed, the leaked liquid is returned to the liquid collecting tank, and pollution caused by discharge to the environment is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the present invention after assembly with the liquid collection tank.

[0022] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0023] Figure 3 This is a bottom view of the impeller structure in this utility model.

[0024] Figure 4 This is a cross-sectional view of the impeller in this utility model.

[0025] Figure 5 This is a top view of the impeller structure in this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Motor; 2. Bracket; 21. Rubber seal; 22. Drain hole; 3. Water baffle ring; 4. Pump cover; 5. Impeller; 5. Front cover plate; 51. Circumferential reinforcing rib; 511. Rear cover plate; 521. Back blade; 521. Pump casing; 6. Suction port; 61. Discharge port; 62. Gap cavity A; 7. Gap cavity B; 8. Liquid collection tank; 9. Mounting plane; 91. Discharge pipeline; 10. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings:

[0028] Example: As attached Figures 1 to 5 As shown, this centrifugal pump for machine tool waste filtration system includes a motor 1, a bracket 2, a rubber seal 21, a drain hole 22, a water baffle ring 3, a pump cover 4, an impeller 5, a front cover plate 51, a circumferential reinforcing rib 511, a rear cover plate 52, a back blade 521, a pump casing 6, a suction port 61, a discharge port 62, a gap cavity A7, a gap cavity B8, a collection tank 9, a mounting plane 91, and a discharge pipe 10.

[0029] Reference Appendix Figure 2 The motor 1 is supported on the pump cover 4 by the bracket 2. Simultaneously, the shaft of the motor 1 extends through the bracket 2 and into the pump cover 4, connecting to and driving the impeller 5. The pump cover 4 is mounted on the pump casing 6, with the impeller 5 positioned between the pump cover 4 and the pump casing 6. Furthermore, a gap is formed between the pump cover 4 and the impeller 5, creating a gap cavity A7. A gap is also formed between the front cover plate 51 of the impeller 5 and the pump casing 6, creating a gap cavity B8. Figure 3 , 4As shown in Figure 5, a back blade 521 is provided on the surface of the rear cover plate 52 of the impeller 5. The back blade 521 can cooperate with the inner wall of the pump casing 6 to prevent waste residue from entering the gap cavity B8. A circumferential reinforcing rib 511 is provided on the surface of the front cover plate 51 of the impeller 5 along the circumferential direction to cooperate with the inner wall of the pump cover 4 to prevent waste residue from entering the gap cavity A7. Furthermore, when the back blade 521 rotates synchronously with the impeller 5, a negative pressure can be generated in the gap cavity A7 to ensure that the liquid flows from the outside of the pump cover 4 to the inside of the pump cover 4 without leakage, thus achieving a seal and eliminating the need for a mechanical seal device in the overall design.

[0030] like Figure 1 As shown, the lower part of the bracket 2 is placed inside the liquid collection tank 9, while the upper part of the bracket 2 contacts and seals against the mounting surface 91 of the liquid collection tank 9. Preferably, the surface of the upper part of the bracket 2 that contacts the mounting surface 91 is provided with a sealing groove, and a rubber seal 21 is installed in the sealing groove. The special centrifugal pump provided by this utility model is an immersion centrifugal pump, and the whole machine is installed on the liquid collection tank 9 of the machine tool equipment, allowing for a small amount of liquid leakage. The leaked liquid flows back into the liquid collection tank and will not be discharged into the environment to cause pollution.

[0031] Preferably, such as Figure 1 , 2 As shown, several drainage holes 22 are opened on the side wall of the bracket 2. Liquid leaking from the pump cover 4 can flow back into the collection tank 9 through the drainage holes 22, preventing the leaked liquid from accumulating and entering the motor, thus protecting the motor. In addition, a water baffle ring 3 is installed on the upper end of the motor 1 shaft extension to prevent liquid from entering the motor along the pump shaft, thus protecting the motor. The lower end of the pump casing 6 is provided with a trumpet-shaped suction port 61, which guides the liquid flow. One side of the pump casing 6 is provided with a discharge port 62, which is connected to the discharge pipe 10. The lower end of the pump casing 6 is provided with a foolproof support foot, which can avoid the risk of insufficient inlet flow area due to installation too low or inlet sealing due to being too close to the wall.

[0032] Preferably, the impeller 5 and pump casing 6 are designed according to the design method of sewage pumps, and the flow channel size is increased to ensure throughput. The pump casing 6 adopts a wide flow channel design, and the radial force during operation is significantly increased compared with ordinary narrow flow channel centrifugal pumps. Considering the stress conditions and smooth operation, throughput performance must be guaranteed while ensuring smooth operation.

[0033] Therefore, in the utility model, the pump shell 6 adopts semi-spiral compression chamber design, compared with annular compression chamber (higher passability) has lower radial force, compared with spiral compression chamber (smaller radial force) has high passability;The pump shell 6 is designed to thicken the wall thickness, improves the wear resistance of the solid particle under the condition of conveying, and considers the corrosion allowance of the conveying medium. The impeller 5 is specially designed, the number of blades is 2-3, the through capacity of the impeller flow passage is guaranteed, and the suction performance of the water pump is improved by adjusting the blade inlet angle. In addition, the impeller 5 adopts non-overload hydraulic design, and does not exceed power under large flow condition, and the whole system does not need to install regulating valve, improves the passability from the system level. Meanwhile, the impeller 5 is designed to increase the blade and front, rear cover plate fillet, thicken the blade thickness, thicken the cover plate wall thickness, improve the wear resistance of the rotating part, and consider the corrosion allowance of the conveying medium.

[0034] The working process of the utility model:

[0035] When installing, first, the support 2 is placed on the installation plane 91 of the liquid collecting tank 9, the rubber sealing element 21 is in contact with the installation plane 91 and is sealed, the motor 1 is supported on the support 2, and the pump cover 4, the pump shell 6 and other components at the lower part of the support 2 are all immersed in the liquid collecting tank 9, and the discharge port 62 is connected with the discharge pipeline 10. When the motor 1 works, the motor shaft drives the impeller 5, and when the back blade 521 rotates synchronously with the impeller 5, negative pressure is generated in the gap cavity A7, ensuring that the liquid flows from the outside of the pump cover 4 to the inside of the pump cover 4, and will not leak from the inside of the pump cover 4 to the outside of the pump cover 4, realizing sealing. In addition, since the centrifugal pump is an immersed centrifugal pump, the whole machine is installed on the liquid collecting tank 9 of the machine tool equipment, and a slight liquid leakage amount is allowed, the liquid leaked from the pump cover 4 returns to the liquid collecting tank 9 through the liquid discharge hole 22, and will not be discharged to the environment to cause pollution.

[0036] It can be understood that, for those skilled in the art, equivalent replacement or change of the technical scheme and the utility model concept of the utility model should belong to the protection scope of the claims attached to the utility model.

Claims

1. A centrifugal pump dedicated to a machine tool waste filtering system, characterized in that: It includes motor (1), support (2), pump cover (4), impeller (5) and pump shell (6), the motor (1) is supported on the pump cover (4) by support (2), motor (1) shaft extends through support (2) and extends into pump cover (4), and is connected to drive impeller (5), pump cover (4) is installed on pump shell (6), so that impeller (5) is located between pump cover (4) and pump shell (6);The clearance cavity A (7) is formed between the pump cover (4) and the impeller (5), the clearance cavity B (8) is formed between the front cover plate (51) of the impeller (5) and the pump shell (6), the rear cover plate (52) surface of the impeller (5) is provided with back blade (521), for cooperating with the inner wall of pump shell (6), block waste residue into clearance cavity B (8), the front cover plate (51) surface of the impeller (5) is provided with circumferential reinforcing rib (511), for cooperating with the inner wall of pump cover (4), block waste residue into clearance cavity A (7).

2. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: The lower part of the support (2) is placed into the liquid collecting tank (9), and the upper part of the support (2) is in contact with the mounting plane (91) of the liquid collecting tank (9).

3. The machine tool sludge filtration system dedicated centrifugal pump of claim 2, wherein: The surface of the upper part of the support (2) in contact with the mounting plane (91) is provided with a rubber sealing element (21).

4. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: A plurality of drainage holes (22) are formed on the side wall of the support (2), and the liquid leaked from the pump cover (4) flows back into the liquid collecting tank (9) through the drainage holes (22).

5. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: The upper end of the motor shaft (1) is provided with a water baffle (3).

6. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: The pump shell (6) adopts a semi-spiral extrusion chamber, the lower end of the pump shell (6) is provided with a trumpet-shaped suction inlet (61), and one side of the pump shell (6) is provided with a discharge outlet (62) connected with a discharge pipeline (10).

7. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: The lower end of the pump shell (6) is provided with an anti-stupid supporting leg.

8. The machine tool sludge filtration system dedicated centrifugal pump of claim 1, wherein: The number of blades of the impeller (5) is 2-3.

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