Submersible pipeline pump with sealing structure

Abstract

The utility model relates to the technical field of pipeline pumps, in particular to a submersible pipeline pump with a sealing structure, which comprises a submersible motor and a pump head with a water inlet and a water outlet, the submersible motor comprises a rotor, a stator, a rotor shaft and a waterproof casing, the rotor and the stator are arranged in the waterproof casing, the rotor shaft is coaxially connected in the rotor, and the water inlet and the water outlet are arranged in the rotor shaft. The two ends of the rotor shaft are rotatably arranged in the waterproof shell through bearings, and the output end of the rotor shaft penetrates out of the waterproof shell. The outer side face of the output end is sleeved with an oil cylinder used for being connected with the waterproof shell and the pump head in a sealed mode, an oil cylinder cover is arranged between the oil cylinder and the pump head in a sealed mode, the output end penetrates through the oil cylinder cover to be in transmission connection with an impeller arranged in the pump head, a first shaft sealing assembly is arranged between the oil cylinder cover and the waterproof shell, and a second shaft sealing assembly is arranged between the oil cylinder cover and the impeller. By arranging the first shaft sealing assembly and the second shaft sealing assembly, double sealing is carried out on the output end of the rotor shaft, so that the sealing performance is more stable, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline pumps, in particular to a submersible pipeline pump with a sealing structure. Background Art

[0002] General-purpose pipeline pumps are used in the transportation of industrial liquids and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire-fighting booster, heating and other cold and hot water circulation booster and equipment matching, as well as air-conditioning unit circulation, cooling water transportation, etc.

[0003] The motors used in existing universal pipeline pumps are standard motors with an IP55 protection grade, so they cannot be used submersible. Furthermore, the temperature of universal pipeline pumps during use is greatly affected by the ambient temperature, and universal pipeline pumps have requirements for installation conditions. A pump room needs to be built for installing universal pipeline pumps, making installation more troublesome. Furthermore, universal pipeline pumps need to exhaust the air in the water inlet pipe before starting, and there is only one sealing structure between the pump head and the motor. Utility Model Content

[0004] The purpose of the utility model is to provide a submersible pipeline pump with a sealing structure, which solves the problem that the general pipeline pump in the prior art cannot be submerged in water for use, and at the same time solves the requirements of the pipeline pump on installation conditions. The pipeline pump can be submerged in water, and can also be floated in water by a float. The heat dissipation of the cooling fan is eliminated, and the influence of the ambient temperature on the pump is shielded, which is more conducive to the heat dissipation of the pump, improves the efficiency of the pump unit, makes the pump more energy-saving, more convenient to use, and does not require air exhaust.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A submersible pipeline pump with a sealing structure includes a submersible motor and a pump head with a water inlet and a water outlet. The submersible motor includes a rotor, a stator, a rotor shaft and a waterproof casing. The rotor and stator are arranged inside the waterproof casing. The rotor shaft is coaxially connected inside the rotor. Both ends of the rotor shaft are rotatably arranged inside the waterproof casing through bearings, and the output end of the rotor shaft passes through the waterproof casing. An oil cylinder for sealingly connecting the waterproof casing and the pump head is sleeved on the outer side of the output end, and an oil cylinder cover is sealed between the oil cylinder and the pump head. The output end passes through the oil cylinder cover and is transmission-connected to an impeller arranged in the pump head. A first shaft sealing assembly is provided between the oil cylinder cover and the waterproof casing, and a second shaft sealing assembly is provided between the oil cylinder cover and the impeller.

[0007] A further technical solution is that the first shaft sealing assembly includes two double-sided mechanical seals and a first support spring. The two double-sided mechanical seals are both mounted on the output end, and the two opposite sides of the two double-sided mechanical seals respectively conflict with the side walls of the waterproof housing and the side walls of the cylinder cover. The first support spring is mounted on the outer side of the output end and located between the two double-sided mechanical seals. The first support spring is in a compressed state, and its two ends are respectively connected to the two double-sided mechanical seals.

[0008] A further technical solution is that a limit ring is protruded on the corresponding side wall of the cylinder cover and the waterproof shell, and the two limit rings are arranged to enclose the outer side of the output end. When the two double-sided machine seals are both mounted on the output end, the outer sides of the two double-sided machine seals are in conflict with the inner sides of the limit rings.

[0009] A further technical solution is that the second shaft sealing assembly includes two single-sided mechanical seals and a second support spring. The two single-sided mechanical seals are both sleeved on the output end, and the two opposite sides of the two single-sided mechanical seals respectively conflict with the side wall of the cylinder cover and the side wall of the impeller. The second support spring is sleeved on the outer side of the output end and located between the two single-sided mechanical seals. The second support spring is in a compressed state, and its two ends are respectively connected to the two single-sided mechanical seals.

[0010] A further technical solution is that an annular groove matching the single-sided machine seal is opened on the side of the cylinder cover close to the pump head, and the annular groove is arranged on the outside of the enclosed output end. When one of the single-sided machine seal sleeves close to the cylinder cover is arranged on the output end, the single-sided machine seal is embedded in the annular groove.

[0011] A further technical solution is that the waterproof housing and the bottom of the pump head are connected with a same bottom plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. By arranging the first shaft sealing assembly and the second shaft sealing assembly to both play a sealing role, the output end of the rotor shaft is double-sealed, making the sealing performance more stable and improving its sealing effect.

[0014] 2. Ensure the sealing of the pipeline pump, so that the pipeline pump can be directly submerged in water or suspended in water for use. Since the pipeline pump is submerged in water, there is no need to build a pump room for installing the pipeline pump, which improves portability. At the same time, the pipeline pump is submerged in water, and the cooling fan of the general pipeline pump is removed. The waterproof shell uses the performance of heat conduction to conduct the heat generated by its internal components to its outside. The water flow outside the waterproof shell absorbs the heat on the outside of the waterproof shell, so that the heat generated by the submersible motor when the pipeline pump is running can be absorbed in time to cool the pipeline pump, which is more conducive to heat dissipation.

[0015] 3. The submersible motor eliminates the cooling fan of the general pipeline pump. When the pipeline pump is in use, there will be no cooling fan to consume mechanical energy, which improves the efficiency of the unit, reduces energy consumption during use, and is more energy-saving when in use. At the same time, the water cooling effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic structural diagram of a submersible pipeline pump with a sealing structure.

[0017] Figure 2 This is a cross-sectional view of a submersible pipeline pump with a sealing structure according to the present utility model.

[0018] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle.

[0019] Icon: 1-waterproof housing, 2-pump head, 21-water inlet, 22-water outlet, 3-rotor, 4-stator, 5-rotor shaft, 6-bearing, 7-output end, 8-oil cylinder, 9-oil cylinder cover, 10-impeller, 11-double-sided mechanical seal, 12-first support spring, 13-limiting ring, 14-single-sided mechanical seal, 15-second support spring, 16-annular groove, 17-base plate, 18-cable. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Example:

[0022] Please see the attached Figure 1 、 Figure 2The utility model shows a submersible pipeline pump with a sealing structure, comprising a submersible motor and a pump head 2 with a water inlet 21 and a water outlet 22. One end of the submersible motor is sealed and connected to a cable 18 for power supply. The submersible motor comprises a rotor 3, a stator 4, a rotor shaft 5 and a waterproof housing 1. The waterproof housing 1 is provided with a rotor 3 and a stator 4. The rotor 3 is coaxially connected to the rotor shaft 5. Both ends of the rotor shaft 5 are rotatably arranged in the waterproof housing 1 through bearings 6. The output end 7 of the rotor shaft 5 passes through the waterproof housing 1; the outer side of the output end 7 is provided with an oil cylinder 8 for sealingly connecting the waterproof housing 1 and the pump head 2. A cylinder cover 9 is sealed between the oil cylinder 8 and the pump head 2. The output end 7 passes through the oil cylinder 8. The cylinder cover 9 is transmission-connected to the impeller 10 in the pump head 2. A first shaft sealing assembly is provided between the oil cylinder cover 9 and the waterproof housing 1. A second shaft sealing assembly is provided between the oil cylinder cover 9 and the impeller 10. In actual use, by arranging a submersible motor, a first shaft sealing assembly and a second shaft sealing assembly, the first shaft sealing assembly and the second shaft sealing assembly both play a sealing role, and a double-pass sealing is performed on the output end of the rotor shaft, so that the sealing performance is more stable and the sealing effect is improved, thereby allowing the pipeline pump to be directly submerged in water for use. When in use, it can be submerged in water, or the pipeline pump can be set to float in water for use through a float, thereby achieving the goal of not having to build another pump room for installing the pipeline pump. By providing a first shaft sealing assembly between the oil cylinder cover 9 and the waterproof housing 1, a lubricating oil chamber is formed between the oil cylinder cover 9, the oil cylinder 8 and the waterproof housing 1, providing favorable lubricating oil conditions for the first shaft sealing assembly, and providing a second shaft sealing assembly between the oil cylinder cover 9 and the impeller 10. The first shaft sealing assembly and the second shaft sealing assembly both play a sealing role, and perform double-pass sealing on the output end 7 of the rotor shaft 5, making the sealing performance more stable and improving its sealing effect, avoiding the situation in the prior art where a universal pipeline pump having only one sealing assembly is used, when the sealing assembly is worn and thus affects the sealing effect, the universal pipeline pump will leak, affecting its normal use, and at the same time, due to the supply of the cable 18, Electricity makes the rotor 3, the stator 4, and the rotor shaft 5 cooperate, and the rotor shaft 5 rotates and drives the impeller 10 to rotate through its output end 7, thereby causing the liquid to flow from the water inlet 21 to the water outlet 22. Since the liquid entering the pump head 2 has a certain pressure under the drive of the impeller 10, by providing a second shaft sealing assembly, it is possible to prevent the pressurized liquid from directly contacting the first shaft sealing assembly through the gap between the output end 7 of the rotor shaft 5 and the cylinder cover 9, thereby avoiding erosion and damage to the first shaft sealing assembly, and preventing the lubricating oil in the lubricating oil cavity formed between the cylinder cover 9, the oil cylinder 8 and the waterproof housing 1 from leaking due to damage to the first shaft sealing assembly, thereby further improving its sealing effect;The difference between the submersible motor in this device and the general pipeline pump is that the cooling fan of the general pipeline pump is removed. Since the pipeline pump is placed in water for use, the waterproof shell 1 uses the performance of heat conduction to conduct the heat generated by its internal components to its outside by heat conduction. The liquid outside the waterproof shell 1 absorbs the heat on the outside of the waterproof shell 1, so that the heat generated by the submersible motor when the pipeline pump is running is absorbed and cooled in time. This cooling method is not affected by the external ambient temperature, but only by the water temperature, which is more conducive to heat dissipation, so that the temperature of the components inside the waterproof shell 1 is maintained within a reasonable range, improving The overall service life is extended, and the cooling fan of the general pipeline pump is eliminated. When the pipeline pump is in use, there is no cooling fan to consume mechanical energy, which improves the efficiency of the unit and reduces energy consumption during use. At the same time, because the pipeline pump is submerged in water, it can avoid the need to remove air from the water inlet pipe when in use, as with general pipeline pumps, reducing pipe damage and improving work efficiency. By replacing submersible sewage pumps, multi-stage submersible pumps, etc., the working water level of submersible sewage pumps and multi-stage submersible pumps is solved. The working water level of this device is only 0.5 meters, which improves practicality.

[0023] Please see the attached Figure 2 、 Figure 3 As shown, the first shaft sealing assembly includes two double-sided mechanical seals 11 and a first supporting spring 12. The two double-sided mechanical seals 11 are both sleeved on the output end 7, and the opposite sides of the two double-sided mechanical seals 11 respectively conflict with the side wall of the waterproof shell 1 and the side wall of the cylinder cover 9. The first supporting spring 12 is sleeved on the outer side of the output end 7 and is located between the two double-sided mechanical seals 11. The first supporting spring 12 is in a compressed state, and its two ends are respectively connected to the two double-sided mechanical seals 11. Since the first supporting spring 12 is in a compressed state, the first supporting spring 12 has elastic force, which plays a supporting and limiting role on the two double-sided mechanical seals 11, preventing the two double-sided mechanical seals 11 from displacing and approaching each other along the length direction of the rotor shaft 5, and their opposite sides do not conflict with the side wall of the waterproof shell 1 and the side wall of the cylinder cover 9, avoiding the opposite sides of the two double-sided mechanical seals 11 from having gaps with the side wall of the waterproof shell 1 and the side wall of the cylinder cover 9, thereby affecting the sealing effect.

[0024] Please see the attached Figure 2 、 Figure 3 It is shown that a limiting ring 13 is protruding from the corresponding side wall of the cylinder cover 9 and the waterproof shell 1. The two limiting rings 13 are arranged to surround the outer side of the output end 7. When the two double-sided mechanical seals 11 are both mounted on the output end 7, the outer sides of the two double-sided mechanical seals 11 are in conflict with the inner sides of the limiting rings 13. When in use, by setting the limiting rings 13, the double-sided mechanical seal 11 can be further limited to prevent it from being displaced from the mounting end of the rotor shaft 5 and affecting the sealing effect.

[0025] Please see the attached Figure 2 、 Figure 3 It is shown that the second shaft sealing assembly includes two single-sided mechanical seals 14 and a second supporting spring 15. The two single-sided mechanical seals 14 are both sleeved on the output end 7, and the opposite sides of the two single-sided mechanical seals 14 respectively conflict with the side wall of the cylinder cover 9 and the side wall of the impeller 10. The second supporting spring 15 is sleeved on the outer side of the output end 7 and is located between the two single-sided mechanical seals 14. The second supporting spring 15 is in a compressed state, and its two ends are respectively connected to the two single-sided mechanical seals 14. When in use, since the second supporting spring 15 is in a compressed state, the second supporting spring 15 has elastic force, which plays a supporting and limiting role on the two single-sided mechanical seals 14, preventing the two single-sided mechanical seals 14 from displacing and approaching each other along the length direction of the rotor shaft 5, ensuring that one of the single-sided mechanical seals 14 close to the cylinder cover 9 conflicts with the side wall of the cylinder cover 9, avoiding the formation of gaps between the single-sided mechanical seal 14 and the side wall of the cylinder cover 9, affecting the sealing effect.

[0026] Please see the attached Figure 2 、 Figure 3 It is shown that an annular groove 16 matching the single-sided mechanical seal 14 is provided on the side of the cylinder cover 9 close to the pump head 2, and the annular groove 16 is arranged on the outside of the enclosed output end 7. When one of the single-sided mechanical seals 14 close to the cylinder cover 9 is sleeved on the output end 7, the single-sided mechanical seal 14 is arranged and embedded in the annular groove 16. By setting the annular groove 16, the single-sided mechanical seal 14 close to the cylinder cover 9 can be limited, and at the same time, the contact area between the cylinder cover 9 and the single-sided mechanical seal 14 can be increased, thereby improving the sealing effect.

[0027] Please see the attached Figure 1 As shown, the bottom of the waterproof housing 1 and the pump head 2 are connected to the same bottom plate 17. By providing the bottom plate 17, it is convenient to install the device in a corresponding position.

[0028] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, various variations and modifications may be made to the components and / or layout of the subject combination arrangement. In addition to variations and modifications to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A submersible pipeline pump with a sealing structure, comprising a submersible motor and a pump head (2) with a water inlet (21) and a water outlet (22), characterized in that: The submersible motor comprises a rotor (3), a stator (4), a rotor shaft (5) and a waterproof housing (1); the rotor (3) and the stator (4) are arranged inside the waterproof housing (1); the rotor (3) is coaxially connected to the rotor shaft (5); both ends of the rotor shaft (5) are rotatably arranged inside the waterproof housing (1) through bearings (6); the output end (7) of the rotor shaft (5) passes through the waterproof housing (1); the outer side of the output end (7) is provided with an oil cylinder (8) for sealingly connecting the waterproof housing (1) and the pump head (2); an oil cylinder cover (9) is sealed between the oil cylinder (8) and the pump head (2); the output end (7) passes through the oil cylinder cover (9) and is transmission-connected to an impeller (10) arranged in the pump head (2); a first shaft sealing assembly is provided between the oil cylinder cover (9) and the waterproof housing (1); and a second shaft sealing assembly is provided between the oil cylinder cover (9) and the impeller (10).

2. A submersible pipeline pump with a sealing structure according to claim 1, characterized in that: The first shaft seal assembly includes two double-sided mechanical seals (11) and a first support spring (12). The two double-sided mechanical seals (11) are both sleeved on the output end (7), and the two opposite sides of the two double-sided mechanical seals (11) are respectively in conflict with the side wall of the waterproof housing (1) and the side wall of the cylinder cover (9). The first support spring (12) is sleeved on the outer side of the output end (7) and is located between the two double-sided mechanical seals (11). The first support spring (12) is in a compressed state, and its two ends are respectively connected to the two double-sided mechanical seals (11).

3. The submersible pipeline pump with a sealing structure according to claim 2, characterized in that: A limiting ring (13) is protruded on one side wall of the oil cylinder cover (9) and the waterproof housing (1), and the two limiting rings (13) are arranged to surround the outer side of the output end (7). When the two double-sided mechanical seals (11) are sleeved on the output end (7), the outer sides of the two double-sided mechanical seals (11) are in conflict with the inner sides of the limiting rings (13).

4. The submersible pipeline pump with a sealing structure according to claim 1, characterized in that: The second shaft seal assembly includes two single-sided mechanical seals (14) and a second support spring (15). The two single-sided mechanical seals (14) are both sleeved on the output end (7), and the two opposite sides of the two single-sided mechanical seals (14) are respectively in conflict with the side wall of the cylinder cover (9) and the side wall of the impeller (10). The second support spring (15) is sleeved on the outer side of the output end (7) and is located between the two single-sided mechanical seals (14). The second support spring (15) is in a compressed state, and its two ends are respectively connected to the two single-sided mechanical seals (14).

5. The submersible pipeline pump with a sealing structure according to claim 4, characterized in that: An annular groove (16) matching the single-sided mechanical seal (14) is provided on one side of the oil cylinder cover (9) close to the pump head (2). The annular groove (16) is arranged to surround the outer side of the output end (7). When one of the single-sided mechanical seals (14) close to the oil cylinder cover (9) is sleeved on the output end (7), the single-sided mechanical seal (14) is arranged to be embedded in the annular groove (16).

6. The submersible pipeline pump with a sealing structure according to claim 1, characterized in that: The waterproof housing (1) and the bottom of the pump head (2) are connected to a common bottom plate (17).

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