Seal-free submerged pump and drainage device

Abstract

The utility model discloses a sealing-free submerged pump and drainage equipment, and relates to the technical field of water pumps, the sealing-free submerged pump comprises a pump body, the pump body comprises a driving part and a liquid inlet part which are connected with each other, the liquid inlet part is immersed in liquid, a pressurizing part is arranged in the liquid inlet part, and the pressurizing part is connected with the driving part. A liquid inlet close to the driving part and a liquid outlet away from the driving part are formed in the side wall of the liquid inlet part, liquid flows into the liquid inlet part from the liquid inlet and is discharged from the liquid outlet after being pressurized by the pressurizing part, the pressurizing part comprises a pump shaft, and a separation layer is arranged between the liquid inlet part and the driving part; a mechanical sealing structure is omitted, a pump shaft directly penetrates through a separation layer without dynamic sealing, a high-pressure area is concentrated on the side, close to a liquid outlet, of a pump body, a driving part is located in a low-pressure area, the requirement can be met only through simple static sealing, and large-particle sediment impurities are prevented from being sucked in the position of a liquid inlet; even if water shortage or air suction suddenly occurs, the problem of sealing failure caused by idling is solved, the service life is prolonged, and the applicability is improved.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a sealless submersible pump and a discharge device. Background Technology

[0002] Submersible pumps, as a common fluid transport device, are widely used in industrial production, such as machine tool coolant circulation. Traditional single-stage submersible pumps are designed without seals, but their head and flow performance are severely reduced, and pump efficiency is significantly decreased. They are usually only suitable for low-performance scenarios with low requirements for flow and head, and cannot meet the growing demand for high flow and high head in modern industrial production.

[0003] To improve the performance (high flow rate, high head) and efficiency of submersible pumps, the current mainstream and mature technical solution in the industry is to use mechanical seals to seal the pump shaft. However, when using mechanical seals for shaft sealing, damage and leakage are inevitable due to usage issues. Furthermore, machine tool pumps have frequent start-stop requirements, which create pressure shocks on the mechanical seals, accelerating damage. Secondly, hard particles in the medium will aggravate the wear of the sealing surface, and it is essential to ensure that the pump is filled with liquid; otherwise, dry grinding will cause damage. Existing mechanical seals are difficult to meet the requirements of high-pressure, impurity-containing, and frequently start-stop submersible pumps for long-term reliable operation. Utility Model Content

[0004] The main purpose of this invention is to provide a sealless submersible pump and a discharge device, which aims to improve the reliability and applicability of the pump.

[0005] To achieve the above objectives, the present invention proposes a seal-less submersible pump, comprising:

[0006] A pump body, the pump body comprising a drive unit and a liquid inlet unit connected to each other, the liquid inlet unit being immersed in a liquid;

[0007] The liquid inlet section is equipped with a pressurizing component, and the side wall of the liquid inlet section has an inlet near the drive section and an outlet away from the drive section. Liquid flows into the liquid inlet section from the inlet, is pressurized by the pressurizing component, and is discharged from the outlet.

[0008] The pressurizing component includes a pump shaft, and a partition layer is provided between the liquid inlet and the drive unit. The pump shaft passes directly through the partition layer to connect with the drive shaft of the drive unit.

[0009] In one embodiment, a first chamber and a second chamber are respectively formed between the two ends of the pressurizing member and the housing of the liquid inlet. The first chamber is located at the end of the pressurizing member closer to the driving part, and the second chamber is located at the end of the pressurizing member away from the driving part. The liquid inlet communicates with the first chamber, and the liquid outlet communicates with the second chamber.

[0010] Wherein, the pressure in the first chamber when the pressurizing component is activated is lower than the pressure in the second chamber.

[0011] In one embodiment, the booster further includes an impeller, which is fixedly connected to the pump shaft to drive the impeller to rotate around the pump shaft;

[0012] The impeller is located between the liquid inlet and the liquid outlet. Liquid flows in from the liquid inlet, is pressurized by the rotation of the impeller, and is discharged from the liquid outlet.

[0013] In one embodiment, there are multiple impellers, each of which is fixedly connected to the pump shaft and is spaced apart along the axial direction of the pump shaft.

[0014] In one embodiment, the liquid inlet is provided with a filter screen.

[0015] In one embodiment, the drive unit includes a motor and a coupling, through which the drive shaft of the motor is connected to the pump shaft.

[0016] In one embodiment, a water tank is also included, the water tank comprising a cover and a tank body, the drive unit being fixedly connected to the cover, and the liquid inlet being located inside the water tank.

[0017] In one embodiment, the outlet is connected to an outlet pipe, and the other end of the outlet pipe, away from the outlet, passes through the water tank and is exposed to the outside.

[0018] In one embodiment, the other end of the liquid outlet tube, away from the liquid outlet, penetrates the cover and is exposed to the outside.

[0019] This utility model also proposes a drainage device, which includes the above-mentioned sealless submersible pump.

[0020] The technical solution of this utility model eliminates the mechanical seal structure and places the liquid inlet near the drive unit and the liquid outlet away from the drive unit. The pressurized high-pressure liquid is directly discharged from the liquid outlet. The pump shaft directly penetrates the partition layer without dynamic sealing. The high-pressure zone is concentrated on the pump body near the liquid outlet side, and the drive unit is in the low-pressure zone. Only a simple static seal is required to meet the requirements. The position of the liquid inlet avoids the intake of large particles of sediment impurities. Furthermore, even if there is a sudden water shortage or air intake, there will be no sealing failure due to dry running, thus improving service life and applicability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a sealless submersible pump according to an embodiment of the present invention;

[0023] Explanation of icon numbers:

[0024] 100. Sealless submersible pump; 1. Pump body; 11. Drive unit; 12. Inlet; 13. Separator; 2. Pressure booster; 21. Pump shaft; 22. Impeller; 23. First chamber; 24. Second chamber; 3. Inlet; 4. Outlet; 5. Motor; 51. Drive shaft; 6. Coupling; 7. Water tank; 71. Cover; 72. Housing; 73. Support frame; 8. Outlet pipe.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Submersible pumps, as a common fluid transport device, are widely used in industrial production, such as machine tool coolant circulation. Traditional single-stage submersible pumps are designed without seals, but their head and flow performance are severely reduced, and pump efficiency is significantly decreased. They are usually only suitable for low-performance scenarios with low requirements for flow and head, and cannot meet the growing demand for high flow and high head in modern industrial production.

[0030] To improve the performance (high flow rate, high head) and efficiency of submersible pumps, the current mainstream and mature technical solution in the industry is to use mechanical seals to seal the pump shaft. However, when using mechanical seals for shaft sealing, damage and leakage are inevitable due to usage issues. Furthermore, machine tool pumps have frequent start-stop requirements, which create pressure shocks on the mechanical seals, accelerating damage. Secondly, hard particles in the medium will aggravate the wear of the sealing surface, and it is essential to ensure that the pump is filled with liquid; otherwise, dry grinding will cause damage. Existing mechanical seals are difficult to meet the requirements of high-pressure, impurity-containing, and frequently start-stop submersible pumps for long-term reliable operation.

[0031] Furthermore, conventional mechanical seals have limited pressure resistance in applications where the pump chamber pressure is greater than 2.5 MPa, thus requiring higher standards for mechanical seals.

[0032] This utility model proposes a sealless submersible pump 100.

[0033] Please see Figure 1 In one embodiment of this utility model, the sealless submersible pump 100 includes:

[0034] Pump body 1, the pump body 1 includes a drive part 11 and a liquid inlet part 12 connected to each other, the liquid inlet part 12 being immersed in liquid;

[0035] The liquid inlet 12 is provided with a pressurizing component 2, and the side wall of the liquid inlet 12 has a liquid inlet 3 close to the drive unit 11 and a liquid outlet 4 away from the drive unit 11. Liquid flows into the liquid inlet 12 from the liquid inlet 3, is pressurized by the pressurizing component 2, and is discharged from the liquid outlet 4.

[0036] The pressurizing component 2 includes a pump shaft 21, and a partition layer 13 is provided between the liquid inlet 12 and the drive unit. The pump shaft 21 passes directly through the partition layer 13 to connect with the drive shaft 51 of the drive unit 11.

[0037] The technical solution of this utility model eliminates the mechanical seal structure and places the liquid inlet 3 near the drive unit 11 and the liquid outlet 4 away from the drive unit 11. The pressurized high-pressure liquid is directly discharged from the liquid outlet 4. The pump shaft 21 directly penetrates the partition layer 13 without dynamic sealing. The high-pressure zone is concentrated on the side of the pump body 1 near the liquid outlet 4, and the drive unit 11 is in the low-pressure zone. Only a simple static seal is required to meet the requirements. The position of the liquid inlet 3 avoids the intake of large particles of sediment impurities. Furthermore, even if there is a sudden water shortage or air intake, there will be no sealing failure due to dry running, thus improving service life and applicability.

[0038] It should be noted that, for ease of explanation, the direction from the liquid outlet 4 to the liquid inlet 3 is defined as upward, and the direction from the liquid inlet 3 to the liquid outlet 4 is defined as downward.

[0039] It is understandable that impurities tend to accumulate at the bottom of the liquid, forming a sedimentation area. If the inlet is located at the end far from the drive unit 11, the inlet will be close to the sedimentation area during use. The liquid entering the pump body 1 will contain impurities, which may damage the equipment. Therefore, it is usually necessary to leave a gap of more than 30mm between the inlet and the bottom of the liquid. However, the technical solution of this utility model avoids sucking in impurities that have settled at the bottom of the liquid by designing the inlet 3 at a high position. It does not require maintaining a gap between the pump body 1 and the bottom of the liquid, and can be installed close to the bottom, effectively preventing particulate matter from damaging the internal components of the pump.

[0040] Optionally, a first chamber 23 and a second chamber 24 are formed between the two ends of the pressurizing member 2 and the housing of the liquid inlet 12, respectively. The first chamber 23 is located at the end of the pressurizing member 2 near the driving part 11, and the second chamber 24 is located at the end of the pressurizing member 2 away from the driving part 11. The liquid inlet 3 is connected to the first chamber 23, and the liquid outlet 4 is connected to the second chamber 24.

[0041] The pressure in the first chamber 23 when the pressurizing component 2 is activated is lower than the pressure in the second chamber 24.

[0042] It is understandable that during use, the drive unit 11 is located above the liquid surface and the liquid inlet 12 is immersed in the liquid. Therefore, whether the liquid moves due to its own weight or is driven by the pressurizing member 2, the direction of liquid movement is downward, that is, moving away from the drive unit 11. Thus, the liquid is less likely to leak from the liquid inlet 12 into the drive unit 11.

[0043] Furthermore, when the booster 2 is activated, the pressure in the first chamber 23 is lower than the pressure in the second chamber 24. That is, the part where the pump shaft 21 and the partition layer 13 intersect will not leak due to excessive pressure. The second chamber 24 with higher pressure is not connected to key equipment such as drive equipment, thus avoiding equipment damage caused by high pressure leakage.

[0044] Optionally, the booster 2 further includes an impeller 22, which is fixedly connected to the pump shaft 21 to drive the impeller 22 to rotate around the pump shaft 21;

[0045] The impeller 22 is located between the liquid inlet 3 and the liquid outlet 4. Liquid flows in from the liquid inlet 3, is pressurized by the rotation of the impeller 22, and is discharged from the liquid outlet 4.

[0046] It should be noted that the impeller 22 has a flow channel inside. As the impeller 22 rotates, the liquid drawn into the impeller 22 is thrown out and pressurized in the radial direction of the impeller 22, and then diffused by the volute and converted into pressure energy to be discharged. The impeller 22 is located higher than the liquid outlet 4. Impurities naturally settle to the bottom of the second chamber 24 due to gravity and will not come into contact with the moving parts with the backflow, thus avoiding damage to the equipment caused by impurities.

[0047] Optionally, there are multiple impellers 22, all of which are fixedly connected to the pump shaft 21 and are spaced apart along the axial direction of the pump shaft 21.

[0048] It is understood that by increasing the number of impellers 22, the pressure on the liquid can be increased, thereby increasing the flow rate and head. Furthermore, since the second chamber 24 is located away from the partition layer 13, there will be no leakage problem even if the pressure increases.

[0049] Optionally, the liquid inlet 3 is equipped with a filter screen.

[0050] It is understandable that the liquid is filtered through the filter screen to prevent large particles of impurities from entering the liquid inlet section 12 and causing damage to the equipment.

[0051] Optionally, the drive unit 11 includes a motor 5 and a coupling 6, through which the drive shaft 51 of the motor 5 is connected to the pump shaft 21.

[0052] like Figure 1 As shown, it can be understood that both the motor 5 and the coupling 6 are positioned above the liquid level and are effectively isolated by the partition layer 13 to prevent liquid from seeping in and causing damage.

[0053] Furthermore, the coupling 6 enables the detachable drive unit 11, which greatly improves the maintenance convenience and efficiency of the key drive unit 11 and protects the core sealing structure of the pump body 1 from unnecessary disassembly and assembly interference, greatly simplifies operation and shortens downtime for maintenance.

[0054] Optionally, the unsealed submersible pump 100 further includes a water tank 7, which includes a cover 71 and a tank body 72. The drive unit 11 is fixedly connected to the cover 71, and the liquid inlet 12 is located inside the water tank 7.

[0055] It is understood that by fixing the drive unit 11 to the cover 71, the drive unit 11 is physically isolated from the liquid to prevent the liquid from seeping into the drive unit 11 during use. Secondly, impurities in the liquid will be deposited at the bottom of the box 72 to avoid the intake of impurities and improve service life.

[0056] Secondly, even if the pump's internal components leak, the high-pressure liquid or impurities will be strictly confined within the water tank 7, effectively preventing the risk of the motor 5 being submerged or damaged by water ingress.

[0057] Furthermore, the cover 71 provides a stable mounting surface and positioning reference for the drive unit 11, facilitating the installation of the device.

[0058] In some embodiments, the housing 72 is provided with a support frame 73 inside, the support frame 73 is fixedly connected to the housing 72, the support frame 73 includes a support surface away from the bottom of the housing 72, the support surface abuts against the liquid inlet 12 to support the pump body 1.

[0059] Furthermore, the liquid inlet 12 is fixedly connected to the support surface of the support frame 73 by fasteners to prevent the pump body 1 from radially shaking due to the movement of the booster 2 during operation, thereby ensuring the stability of the pump body 1 and improving the service life of the equipment.

[0060] Optionally, the outlet 4 is connected to an outlet pipe 8, and the other end of the outlet pipe 8 away from the outlet 4 passes through the water tank 7 and is exposed to the outside.

[0061] It should be noted that the high-pressure liquid does not need to flow through the sealing area of ​​the pump shaft 21 throughout the entire process. This fundamentally solves the risk of accelerated wear and failure caused by the "seal located in the high-pressure area" of traditional submersible pumps. The exposed end of the outlet pipe 8 provides a standardized external interface, such as a flange or thread, so that users can directly connect the outlet pipe 8 without additional modifications to the structure of the water tank 7. Furthermore, when repairing or replacing external pipes, only the exposed interface needs to be operated, without affecting the seal of the water tank 7 or its internal components.

[0062] Optionally, the other end of the liquid outlet pipe 8, away from the liquid outlet 4, passes through the cover 71 and is exposed to the outside.

[0063] It is understandable that the cover 71 is higher than the liquid surface, so the liquid outlet pipe 8 is passed through the cover 71 so that the connection between the liquid outlet pipe 8 and the box 72 is higher than the liquid surface, making it less likely to leak.

[0064] This utility model also proposes a drainage device, which includes a sealless submersible pump. The specific structure of the sealless submersible pump is as described in the above embodiments. Since this drainage device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0065] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A sealless submersible pump, characterized in that, include: A pump body, the pump body comprising a drive unit and a liquid inlet unit connected to each other, the liquid inlet unit being immersed in a liquid; The liquid inlet section is equipped with a pressurizing component, and the side wall of the liquid inlet section has an inlet near the drive section and an outlet away from the drive section. Liquid flows into the liquid inlet section from the inlet, is pressurized by the pressurizing component, and is discharged from the outlet. The pressurizing component includes a pump shaft, and a partition layer is provided between the liquid inlet and the drive unit. The pump shaft passes directly through the partition layer to connect with the drive shaft of the drive unit.

2. The sealless submersible pump as described in claim 1, characterized in that, A first chamber and a second chamber are respectively formed between the two ends of the pressurizing component and the housing of the liquid inlet. The first chamber is located at the end of the pressurizing component closer to the driving part, and the second chamber is located at the end of the pressurizing component away from the driving part. The liquid inlet is connected to the first chamber, and the liquid outlet is connected to the second chamber. Wherein, the pressure in the first chamber when the pressurizing component is activated is lower than the pressure in the second chamber.

3. The sealless submersible pump as described in claim 2, characterized in that, The booster also includes an impeller, which is fixedly connected to the pump shaft to drive the impeller to rotate around the pump shaft; The impeller is located between the liquid inlet and the liquid outlet. Liquid flows in from the liquid inlet, is pressurized by the rotation of the impeller, and is discharged from the liquid outlet.

4. The sealless submersible pump as described in claim 3, characterized in that, The impellers are multiple in number, and each impeller is fixedly connected to the pump shaft and is spaced apart along the axial direction of the pump shaft.

5. The sealless submersible pump as described in claim 3, characterized in that, The liquid inlet is equipped with a filter screen.

6. The sealless submersible pump as described in claim 1, characterized in that, The drive unit includes a motor and a coupling, through which the drive shaft of the motor is connected to the pump shaft.

7. The sealless submersible pump as described in claim 5, characterized in that, It also includes a water tank, which includes a cover and a tank body. The drive unit is fixedly connected to the cover, and the liquid inlet is located inside the water tank.

8. The sealless submersible pump as described in claim 7, characterized in that, The outlet is connected to an outlet pipe, and the other end of the outlet pipe, away from the outlet, passes through the water tank and is exposed to the outside.

9. The sealless submersible pump as described in claim 8, characterized in that, The other end of the liquid outlet tube, away from the liquid outlet, passes through the cover and is exposed to the outside.

10. A drainage device, characterized in that, Includes the sealless submersible pump according to any one of claims 1 to 9.

Images