A cutting fluid delivery screw pump

Abstract

The application relates to the technical field of ship fuel delivery, in particular to a cutting fluid delivery screw pump, which comprises a pump body structure, the pump body structure comprises a front flange, a liquid outlet cover, a shell and a liquid suction cover arranged in sequence along a first direction, an axle hole is arranged at the front flange, a liquid outlet cavity and a liquid outlet port in communication with the liquid outlet cavity are arranged at the liquid outlet cover, a liquid suction cavity and a liquid suction port in communication with the liquid suction cavity are arranged at the liquid suction cover, one end of the liquid suction cavity far from the shell is sealed, a screw cavity is arranged at the shell, the liquid suction cavity is in communication with the liquid outlet cavity through the screw cavity; a screw part comprises a driving screw and two driven screws, the driving screw has a driving helical section, an axle connecting section, a sealing section and a power section, and the two ends of the axle connecting section are connected with the driving helical section and the sealing section respectively.

Description

Technical Field

[0001] This application relates to the field of fluid transport technology, and in particular to a cutting fluid transport screw pump. Background Technology

[0002] In many industries, including machinery manufacturing, cutting fluid delivery is a crucial step. Cutting fluid cools, lubricates, cleans, and prevents rust on cutting tools and workpieces, playing a vital role in improving machining quality, extending tool life, and ensuring production efficiency. With the continuous development of industrial production, the performance requirements for cutting fluid delivery equipment are becoming increasingly stringent. Highly efficient, stable, and reliable cutting fluid delivery equipment has become a key need for industry development. Good cutting fluid delivery equipment ensures accurate delivery of cutting fluid to the machining area, providing strong support for production and driving the manufacturing industry towards higher quality and higher efficiency.

[0003] In related technologies, conventional screw pumps can be used to deliver cutting fluid. These pumps propel the fluid forward through the rotation of a screw and possess a certain degree of self-priming capability, allowing them to meet specific pressure and flow requirements. However, the built-in bearings of conventional screw pumps are susceptible to cutting fluid intrusion, leading to unstable bearing operation. Utility Model Content

[0004] To reduce the intrusion of cutting fluid into the bearing, this application provides a cutting fluid delivery screw pump.

[0005] The cutting fluid delivery screw pump provided in this application adopts the following technical solution: A cutting fluid delivery screw pump includes a pump body structure, comprising a front flange, a discharge cover, a housing, and a suction cover arranged sequentially along a first direction. The front flange has a shaft hole. The discharge cover has a discharge chamber and a discharge port communicating with the discharge chamber. The suction cover has a suction chamber and a suction port communicating with the suction chamber. The end of the suction chamber away from the housing is sealed. The housing has a screw cavity, and the suction chamber communicates with the discharge chamber through the screw cavity. A screw section includes a driving screw and two driven screws. The driving screw has a driving helical section and a shaft connection. The shaft connection section comprises a shaft connecting section, a sealing section, and a power section. The two ends of the shaft connecting section are respectively connected to the driving helical section and the sealing section. The shaft diameter of the shaft connecting section is smaller than the shaft diameter of the driving helical section. The power section is located at the end of the sealing section away from the shaft connecting section. The driven screw has a driven helical section. Both the driving screw and the driven screw are rotatably connected to the screw cavity around their own axes. The driven helical section meshes with the driving helical section. The end of the driving screw away from the driving helical section passes through the liquid outlet cavity and the shaft hole in sequence. The liquid outlet corresponds to the position of the shaft connecting section.

[0006] By adopting the above technical solution, the pump body structure allows the cutting fluid to enter the suction chamber from the suction port, be transported to the discharge chamber via the screw chamber, and be discharged from the discharge port. The cooperation between the driving screw and the driven screw in the screw section, and the meshing of the driven helical section with the driving helical section, enables the delivery of cutting fluid. The shaft diameter of the shaft connection section is smaller than that of the driving helical section, and the position of the discharge port corresponds to that of the shaft connection section, which is conducive to the discharge of cutting fluid. The sealing section can prevent the cutting fluid from seeping along the driving screw to the power section side, thereby effectively reducing the risk of cutting fluid corrosion to the components in the power section and extending the service life of the screw pump.

[0007] Optionally, the sealing section includes a front sealing section away from the shaft connection section and a rear sealing section close to the shaft connection section, the front sealing section being used to install a mechanical seal, and the rear sealing section having a labyrinth seal on its sidewall.

[0008] By adopting the above technical solution, the labyrinth seal and mechanical seal are combined. The active screw labyrinth seal can increase the resistance to liquid leakage, while the mechanical seal can isolate the small amount of cutting fluid leaking from the labyrinth seal, reducing the intrusion of cutting fluid into the bearing. This is beneficial for protecting the bearing, ensuring stable bearing operation, and extending the service life of the screw pump.

[0009] Optionally, the active screw is provided with a flow guide channel along the central axis. One end of the flow guide channel passes through the active spiral section, and the other end corresponds to the connection position of the front sealing section and the rear sealing section. The side wall of the active screw is provided with a flow guide hole that communicates with the flow guide channel.

[0010] By adopting the above technical solution, the pressure at the suction cap is low, and the leakage at the guide hole can be absorbed through the guide channel. Even if a small amount of liquid leaks into the bearing, the liquid can flow back from the guide hole to the suction cap through the guide channel, further reducing the intrusion of cutting fluid into the bearing, better protecting the bearing, and ensuring the smooth operation of the bearing.

[0011] Optionally, the guide hole is located at the connection position between the front sealing section and the rear sealing section.

[0012] By adopting the above technical solution, a small amount of liquid leaking into the bearing can flow smoothly back to the liquid suction cover through the guide hole located at the connection between the front and rear sealing sections, thereby preventing liquid from accumulating at the bearing and better protecting the bearing.

[0013] Optionally, the number of the flow guide holes can be multiple.

[0014] By adopting the above technical solution, multiple guide holes can increase the channels for liquid return. Even if a small amount of liquid leaks into the bearing, it can more efficiently return from the guide holes to the liquid suction cover through the guide channels, further reducing the accumulation of liquid in the bearing and better protecting the bearing.

[0015] Optionally, the screw cavity includes a main screw chamber and two auxiliary screw chambers parallel to the main screw chamber. The auxiliary screw chambers are located on both sides of the main screw chamber. The driving screw is located in the main screw chamber, and the driven screw is located in the auxiliary screw chamber.

[0016] By adopting the above technical solution, the driving screw and the driven screw are respectively set in the main screw chamber and the auxiliary screw chamber, which can ensure that the screw rotates stably in the screw cavity and facilitate the normal delivery of cutting fluid in the screw pump.

[0017] Optionally, the power section includes a journal for mounting the bearing and a keyed connection section for connecting to an external power source. The journal is connected to the sealing section. The keyed connection section is provided with a keyway for mounting a flat key. A shaft clip and a hole clip for fixing the bearing are provided between the front flange and the liquid outlet cover.

[0018] By adopting the above technical solution, the bearing installed on the journal on the side of the sealing section away from the active spiral section is an external bearing. It is isolated from the internal cutting fluid by mechanical seal and labyrinth seal, which can reduce the intrusion of cutting fluid into the bearing, protect the bearing, ensure the smooth operation of the bearing, and extend the service life of the screw pump.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. The combination of labyrinth seal and mechanical seal, with the mechanical seal isolating the internal liquid, can reduce the intrusion of cutting fluid into the bearing, protect the bearing, ensure stable bearing operation, and extend the service life of the screw pump; 2. The increased length of the active screw labyrinth seal increases the resistance to liquid leakage along the active screw. It is also equipped with guide holes and guide channels, allowing a small amount of leaked liquid to flow back to the suction cap, thus solving the problem of low volumetric efficiency. 3. The screw is made of rust-resistant alloy steel and undergoes heat treatment to improve its hardness and wear resistance, so that the screw can achieve the wear resistance and rust prevention effect of oil solution when used in 95% water cutting fluid. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of the cutting fluid delivery screw pump provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the active screw provided in an embodiment of this application; Figure 3This is a schematic diagram of the internal structure of the active screw provided in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1-Front flange; 101-Shaft hole; 2-Discharge cover; 201-Discharge chamber; 202-Discharge port; 3-Housing shell; 301-Main screw chamber; 302-Auxiliary screw chamber; 4-Suction cover; 401-Suction chamber; 402-Suction port; 5-Driven screw; 501-Driven helical section; 502-Shaft connection section; 503-Front sealing section; 504-Rear sealing section; 505-Junior journal; 506-Key connection section; 507-Guide channel; 508-Guide hole; 6-Driven screw; 7-Shaft clip; 8-Hole clip; 9-Bearing; 10-Flat key; 11-First hexagon socket head cap screw; 12-Second hexagon socket head cap screw; 13-Third hexagon socket head cap screw; 14-Mechanical seal; 15-Bushing; 16-Pressure plate; 17-Hexagon socket head cap countersunk screw. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0023] This application discloses a cutting fluid delivery screw pump.

[0024] The cutting fluid delivery screw pump provided in this application includes a pump body structure and a screw section. The pump body structure and the screw section cooperate with each other. The pump body structure provides installation space and a liquid delivery channel for the screw section. The screw section rotates within the pump body structure to deliver the cutting fluid, achieving the effect of efficient and stable delivery of cutting fluid.

[0025] like Figure 1As shown, the pump body structure includes a front flange 1, an outlet cover 2, a housing 3, and a suction cover 4 arranged sequentially along a first direction. The front flange 1 has a shaft hole 101, which is generally a circular through hole for the drive screw 5 to pass through. The front flange 1 is typically made of high-strength cast steel, which has good rigidity and stability and can withstand greater pressure. The outlet cover 2 has an outlet chamber 201 and an outlet port 202 connected to the outlet chamber 201. The outlet chamber 201 is a relatively large cavity used to temporarily store and buffer the cutting fluid to be discharged, while the outlet port 202 is the channel for the cutting fluid to be discharged. The outlet cover 2 can be made of aluminum alloy, which is lightweight and has a certain degree of corrosion resistance, or it can be made of the same material as the front flange 1. The suction cap 4 has a suction chamber 401 and a suction port 402 connected to the suction chamber 401. The suction chamber 401 is the space for the cutting fluid to enter, and the suction port 402 is the inlet for the cutting fluid. The end of the suction chamber 401 away from the housing 3 is sealed to prevent cutting fluid leakage. The suction cap 4 can be made of the same aluminum alloy as the discharge cap 2 or the same material as the front flange 1. The housing 3 has a screw cavity, and the suction chamber 401 is connected to the discharge chamber 201 through the screw cavity. The screw cavity is the space for the screw to rotate, and its size is adapted to the size of the screw. The housing 3 can be made of cast iron to ensure its strength and stability. The front flange 1 is connected to the discharge cap 2 by a first hexagon socket head cap bolt 11. The first hexagon socket head cap bolt 11 has good tightening properties and can ensure a tight connection between the front flange 1 and the discharge cap 2. The liquid outlet cover 2 is connected to the housing 3 by the second hexagon socket bolt 12, and the liquid suction cover 4 is connected to the housing 3 by the third hexagon socket bolt 13. The connection method of these hexagon socket bolts makes the assembly and disassembly of the pump body structure relatively convenient.

[0026] like Figures 1-3As shown, the screw section includes a driving screw 5 and two driven screws 6. The driving screw 5 has a driving helical section 501, a shaft connecting section 502, a sealing section, and a power section. The two ends of the shaft connecting section 502 are connected to the driving helical section 501 and the sealing section, respectively. The shaft diameter of the shaft connecting section 502 is smaller than the shaft diameter of the driving helical section 501. This design allows a certain pressure difference to be formed during the liquid transportation process, which is beneficial to the liquid transportation. The power section is located at the end of the sealing section away from the shaft connecting section 502. The driven screws 6 have driven helical sections. Both the driving screw 5 and the driven screws 6 are rotatably connected to the screw cavity around their own axes. The driven helical sections mesh with the driving helical sections 501. When the driving screw 5 rotates, it drives the driven screws 6 to rotate through the meshing action, thereby realizing the transportation of cutting fluid. The end of the driving screw 5 furthest from the driving helical section 501 passes through the outlet chamber 201 and the shaft hole 101 in sequence. The outlet 202 corresponds to the position of the shaft connection section 502, allowing the delivered cutting fluid to be smoothly discharged from the outlet 202. Both the driving screw 5 and the driven screw 6 are made of rust-resistant alloy steel, which has excellent rust-resistant properties. Furthermore, heat treatment of the material increases its hardness and wear resistance, enabling the screw, which originally could only use oil as a working medium, to achieve the same wear resistance and rust prevention as an oil solution when used with 95% water-based cutting fluid. The labyrinth seal length of the driving screw 5 is more than double that of a conventional screw pump, and the resistance to leakage along the driving screw 5 is also more than doubled. The driving screw 5 is equipped with a guide hole 508 and a guide channel 507. Even if a small amount of liquid leaks into the bearing 9, it will flow back to the suction cover 4 through the guide hole 508 and the guide channel 507.

[0027] like Figure 2 and Figure 3 As shown, the sealing section includes a front sealing section 503 away from the shaft connection section 502 and a rear sealing section 504 close to the shaft connection section 502. The front sealing section 503 is used to install the mechanical seal 14, which has good sealing performance and can effectively prevent liquid leakage. A labyrinth seal is provided on the side wall of the rear sealing section 504. The labyrinth seal increases the resistance to liquid leakage through a complex channel structure. The drive screw 5 has a guide channel 507 along its central axis. One end of the guide channel 507 passes through the drive screw section 501, and the other end corresponds to the connection position of the front sealing section 503 and the rear sealing section 504. The side wall of the drive screw 5 has a guide hole 508 that communicates with the guide channel 507. The guide hole 508 is located at the connection position of the front sealing section 503 and the rear sealing section 504, and there are multiple guide holes 508, which can more effectively guide the leaked liquid back to the liquid suction cover 4.

[0028] The screw chamber includes a main screw chamber 301 and two auxiliary screw chambers 302 parallel to the main screw chamber 301. The auxiliary screw chambers 302 are located on both sides of the main screw chamber 301. The driving screw 5 is located in the main screw chamber 301, and the driven screw 6 is located in the auxiliary screw chamber 302. This layout makes the cooperation between the driving screw 5 and the driven screw 6 more stable, which is beneficial to the delivery of cutting fluid.

[0029] The power section includes a journal 505 for mounting the bearing 9 and a keyed connection section 506 for connecting to an external power source. The journal 505 is connected to the sealing section. The keyed connection section 506 has a keyway for mounting a flat key 10. The flat key 10 transmits external power to the driving screw 5, causing it to rotate. The bearing 9 has a retainer 7 and a retainer 8 for fixing it. The retainer 7 and retainer 8 ensure stable installation of the bearing 9 and prevent displacement during rotation. The suction cap 4 has a bushing 15 that mates with the driven screw 6. The bushing 15 mates with the suction cap 4 via a pressure plate 16. The pressure plate 16 is connected to the suction cap 4 via a countersunk head screw 17. The bushing 15 reduces wear between the driven screw 6 and the suction cap 4, extending the service life of the driven screw 6.

[0030] The implementation principle of a cutting fluid delivery screw pump according to this application embodiment is as follows: This cutting fluid delivery screw pump reduces liquid leakage and improves volumetric efficiency by combining a labyrinth seal with a mechanical seal 14. An external bearing 9 is isolated from the internal liquid by the mechanical seal 14, reducing the intrusion of cutting fluid into the bearing 9, protecting it, ensuring stable operation, and extending the service life of the screw pump. The increased labyrinth seal length of the drive screw 5 and the placement of the guide hole 508 and guide channel 507 further reduce liquid leakage and allow leaked liquid to flow back. Rust-proofing and wear-resistant treatment of the screw ensures good performance even when delivering cutting fluid with high water content. The rational combination of the pump body structure and the screw section achieves efficient and stable delivery of cutting fluid, representing a significant improvement and enhancement compared to existing technologies.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cutting fluid delivery screw pump, characterized in that, include: The pump body structure includes a front flange (1), a liquid outlet cover (2), a housing (3), and a liquid suction cover (4) arranged sequentially along a first direction. The front flange (1) is provided with a shaft hole (101). The liquid outlet cover (2) is provided with a liquid outlet chamber (201) and a liquid outlet (202) connected to the liquid outlet chamber (201). The liquid suction cover (4) is provided with a liquid suction chamber (401) and a liquid suction outlet (402) connected to the liquid suction chamber (401). The end of the liquid suction chamber (401) away from the housing (3) is sealed. The housing (3) is provided with a screw cavity. The liquid suction chamber (401) is connected to the liquid outlet chamber (201) through the screw cavity. The screw section includes a driving screw (5) and two driven screws (6). The driving screw (5) has a driving helical section (501), a shaft connecting section (502), a sealing section, and a power section. The two ends of the shaft connecting section (502) are respectively connected to the driving helical section (501) and the sealing section. The shaft diameter of the shaft connecting section (502) is smaller than the shaft diameter of the driving helical section (501). The power section is located on the sealing section away from the shaft connecting section (502). At one end, the driven screw (6) has a driven helical section. Both the driving screw (5) and the driven screw (6) are rotatably connected to the screw cavity around their own axis. The driven helical section meshes with the driving helical section (501). The end of the driving screw (5) away from the driving helical section (501) passes through the liquid outlet cavity (201) and the shaft hole (101) in sequence. The position of the liquid outlet (202) corresponds to that of the shaft connection section (502).

2. The cutting fluid delivery screw pump according to claim 1, characterized in that, The sealing section includes a front sealing section (503) away from the shaft connection section (502) and a rear sealing section (504) close to the shaft connection section (502). The front sealing section (503) is used to install a mechanical seal (14), and the rear sealing section (504) is provided with a labyrinth seal on its sidewall.

3. The cutting fluid delivery screw pump according to claim 2, characterized in that, The active screw (5) is provided with a flow guide channel (507) along its central axis. One end of the flow guide channel (507) passes through the active spiral section (501), and the other end corresponds to the connection position of the front sealing section (503) and the rear sealing section (504). The side wall of the active screw (5) is provided with a flow guide hole (508) that communicates with the flow guide channel (507).

4. The cutting fluid delivery screw pump according to claim 3, characterized in that, The flow guide hole (508) is located at the connection position between the front sealing section (503) and the rear sealing section (504).

5. The cutting fluid delivery screw pump according to claim 3, characterized in that, The number of the flow guide holes (508) is multiple.

6. The cutting fluid delivery screw pump according to claim 1, characterized in that, The screw cavity includes a main screw chamber (301) and two auxiliary screw chambers (302) parallel to the main screw chamber (301). The auxiliary screw chambers (302) are located on both sides of the main screw chamber (301). The driving screw (5) is located in the main screw chamber (301), and the driven screw (6) is located in the auxiliary screw chambers (302).

7. The cutting fluid delivery screw pump according to claim 1, characterized in that, The power section includes a journal (505) for mounting the bearing (9) and a key connection section (506) for connecting to an external power source. The journal (505) is connected to the sealing section. The key connection section (506) is provided with a keyway for mounting a flat key (10). A shaft clip (7) and a hole clip (8) for fixing the bearing (9) are provided between the front flange (1) and the liquid outlet cover (2).

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