Magnetic drive pump capable of performing dry operation

Abstract

The utility model relates to the technical field of pump equipment, in particular to a magnetic drive pump capable of performing dry running, which comprises a pump body, an impeller, a driven shaft, an outer magnetic rotor, a bracket, an isolation sleeve, an inner magnetic rotor, a bearing box body, a driving shaft and a connecting piece, the pump body, the bracket, the connecting piece and the bearing box body are connected in sequence; one end of the driven shaft is connected with the impeller, and the other end of the driven shaft is connected with the outer magnetic rotor; one end of the driving shaft close to the driven shaft is connected with the inner magnetic rotor; the isolation sleeve is located between the inner magnetic rotor and the outer magnetic rotor, and the open end of the isolation sleeve is connected with the connecting piece; the connecting piece is provided with an air inlet channel and an air outlet channel. Compressed air enters the spacer sleeve through the air inlet channel and then is exhausted through the air outlet channel, heat at the spacer sleeve is taken away, and temperature rise is avoided. The outside of the isolation sleeve bears pressure from media, and the inside of the isolation sleeve bears pressure of compressed air, so that internal pressure and external pressure of the isolation sleeve are balanced, and the isolation sleeve is prevented from being damaged due to pressure difference.

Description

Technical Field

[0001] This utility model relates to the field of pump equipment technology, and in particular to a magnetic pump that can operate in dry conditions. Background Technology

[0002] Fully sealed, leak-free, and corrosion-resistant magnetic drive centrifugal pumps (magnetic pumps) have become standard equipment widely used in petrochemical, pharmaceutical, energy, nuclear, and environmental protection sectors. They are widely used to transport various corrosive, flammable, explosive, and toxic media.

[0003] Magnetic drive pumps drive the impeller within the pump body to rotate through the permanent magnet force between the inner and outer magnetic rotors of the magnetic seal drive. The sliding bearings inside the magnetic drive pump, which support the weight of the impeller and rotor, rely on the medium being pumped for lubrication and cooling. Therefore, traditional magnetic drive pumps will have a warning on their product nameplate stating "No Dry Run". However, industries using magnetic drive pumps generally operate continuously for 24 hours, especially at night when no one is on duty. When the material in the storage tank is emptied by the pump and it is not stopped in time, the pump will run dry. A large amount of eddy current heat from the isolation sleeve and frictional heat from the sliding bearings will be generated. This heat cannot be dissipated, causing the temperature to rise sharply. This will accelerate the wear of friction pairs such as sliding bearings. The isolation sleeve and inner magnetic rotor may rub against each other, or the isolation sleeve may be damaged under pressure difference, resulting in medium leakage. The inner and outer magnetic rotors may demagnetize due to temperature rise. In more serious cases, it may lead to a larger accident of the entire equipment, causing the pump to be unable to operate stably, shortening the pump's operating cycle, and increasing the frequency of maintenance.

[0004] Therefore, ensuring that the magnetic pump can continue to run dry in the event of a liquid interruption is crucial for the safe operation of the equipment. Utility Model Content

[0005] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a dry-running magnetic pump.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] This utility model provides a dry-running magnetic pump, including a pump body, an impeller, a driven shaft, an outer magnetic rotor, a bracket, an isolation sleeve, an inner magnetic rotor, a bearing housing, a drive shaft, and a connecting component; the pump body, bracket, connecting component, and bearing housing are connected in sequence; the pump body has an internal cavity, and the impeller and driven shaft are both located in the cavity. One end of the driven shaft is connected to the impeller, and the other end is connected to the outer magnetic rotor. The outer magnetic rotor has a through hole; the drive shaft is disposed in the bearing housing, and the end of the drive shaft near the driven shaft is connected to the inner magnetic rotor; the isolation sleeve is located between the inner magnetic rotor and the outer magnetic rotor, and the open end of the isolation sleeve is connected to the connecting component; the connecting component has an air inlet channel and an air outlet channel, and both the air inlet channel and the air outlet channel communicate with the interior of the isolation sleeve.

[0008] By adopting the above-mentioned technical solution provided by this utility model, external fluid is introduced into the interior of the isolation sleeve through the air inlet channel and discharged through the air outlet channel, thereby removing the heat from the isolation sleeve in a timely manner and preventing the temperature from rising; at the same time, the outside of the isolation sleeve is subjected to the pressure from the medium, and the inside is subjected to the pressure of the introduced fluid, thereby achieving a balance between the pressure inside and outside the isolation sleeve and preventing the isolation sleeve from being damaged due to pressure difference.

[0009] Based on the above technical solution, the present invention can also be improved in the following ways:

[0010] Furthermore, the outer wall of the bracket is provided with a jacket, and the jacket is connected to a cooling component.

[0011] Furthermore, the cooling component includes a refrigerant storage tank, which has a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected to the jacket.

[0012] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the bracket is used as a flow-through component and is in direct contact with the medium. By setting a jacket and cooling components on the outer wall of the bracket, the temperature of the bracket and the medium can be reduced, and the heat between the isolation sleeve and the bracket can be removed in time. In the event of medium evacuation or pump dry operation, the temperature inside the pump can be further reduced.

[0013] Furthermore, the internal magnetic rotor is equipped with a forced circulation mechanism.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that by setting a forced circulation mechanism on the inner magnetic rotor, the flow of fluid is accelerated, thereby timely and in large quantities removing the heat inside the isolation sleeve, and effectively cooling the inside of the isolation sleeve.

[0015] Furthermore, multiple through holes are provided, and the multiple through holes are evenly or spaced apart on the outer magnetic rotor to connect the inner and outer sides of the outer magnetic rotor.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is that the through hole facilitates the connection between the cavity and the outside of the isolation sleeve, thereby allowing the outside of the isolation sleeve to withstand the pressure from the medium.

[0017] Furthermore, the air inlet channel and the air outlet channel are distributed at intervals or symmetrically on the connector.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that it further improves the fluidity, thereby achieving effective cooling of the interior of the isolation sleeve.

[0019] Furthermore, both the air inlet channel and the air outlet channel include a first air duct and a second air duct that are connected to each other. The second air duct is connected to the interior of the isolation sleeve. The first air duct is set vertically, and the second air duct is set at an angle.

[0020] The beneficial effects of adopting the above-mentioned further technical solution are: it helps to guide the fluid, further improves the fluid's fluidity, and thus achieves effective cooling of the interior of the isolation sleeve.

[0021] Furthermore, it also includes a sliding bearing assembly and a thrust bearing assembly. The sliding bearing assembly includes a sliding bearing housing, a sliding bearing, and a bushing. The sliding bearing housing is fixed on the pump body, the bushing is sleeved on the driven shaft, and the sliding bearing is disposed between the sliding bearing housing and the bushing. The thrust bearing assembly is sleeved on the driven shaft.

[0022] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the sliding bearing assembly is used to improve the support stability and rotational accuracy of the driven shaft, reduce friction and wear, and increase the service life of the bearing and the driven shaft.

[0023] Furthermore, it also includes a pump cover, which is installed at the end of the pump body away from the bearing housing.

[0024] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the pump cover is used to seal the internal cavity of the pump body, ensuring that the inside of the pump body is isolated from the external environment, preventing media leakage and the entry of external pollutants, while facilitating the maintenance and repair of the internal components of the pump body by the staff.

[0025] Furthermore, compressed air is introduced into the isolation sleeve, and the compressed air enters through the air inlet channel and exits through the air outlet channel.

[0026] The advantages of adopting the above-mentioned further technical solution are: using compressed air to cool the inside of the isolation sleeve is inexpensive, clean, and will not cause pollution to the equipment or the environment.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] This utility model provides a dry-running magnetic pump that allows external fluid to be introduced into the isolation sleeve through an air inlet channel and discharged through an air outlet channel, thereby removing heat from the isolation sleeve in a timely manner and preventing temperature rise. The bracket, acting as a flow-through component, directly contacts the medium. By installing a jacket and cooling components on the outer wall of the bracket, the bracket and the medium are cooled, effectively removing heat between the isolation sleeve and the bracket (i.e., inside the bracket outside the isolation sleeve). This further ensures a lower pump temperature in the event of medium cavitation or dry-running. Both the internal and external sealed cavities of the isolation sleeve can be cooled, ensuring stable pump operation. The traditional connection between the motor output shaft and the external magnetic rotor is changed to a connection between the motor output shaft and the internal magnetic rotor. This changes the pressure on the isolation sleeve from the internal medium to the external medium pressure, allowing the outside of the isolation sleeve to bear the pressure from the medium while the inside is subjected to the pressure of the compressed air, thus achieving pressure balance between the inside and outside of the isolation sleeve and preventing damage due to pressure difference. Attached Figure Description

[0029] Figure 1 This diagram shows a schematic of the structure of a dry-running magnetic pump according to an embodiment of the present invention.

[0030] Figure label:

[0031] 1. Pump body; 2. Impeller; 3. Pump cover; 4. Driven shaft; 5. Sliding bearing assembly; 51. Sliding bearing seat; 52. Sliding bearing; 53. Shaft sleeve; 6. Forced circulation mechanism; 7. Thrust bearing assembly; 8. External magnetic rotor; 9. Bracket; 10. Isolation sleeve; 11. Internal magnetic rotor; 12. Air inlet channel; 13. Refrigerant storage tank; 14. Bearing housing; 15. Air outlet channel; 16. Drive shaft; 18. Connecting parts; 19. Through hole. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0033] See Figure 1 A dry-operable magnetic pump includes a pump body 1, an impeller 2, a driven shaft 4, a sliding bearing assembly 5, a drive shaft 16, an inner magnetic rotor 11, an outer magnetic rotor 8, a bracket 9, an isolation sleeve 10, a bearing housing 14, and a connecting piece 18; the pump body 1, bracket 9, connecting piece 18, and bearing housing 14 are connected sequentially; the pump body 1 has an internal cavity, and the impeller 2 and driven shaft 4 are both located in the cavity. One end of the driven shaft 4 is connected to the impeller 2, and the other end is connected to the outer magnetic rotor 8; the drive shaft 16 is disposed in the bearing housing 14, and the end of the drive shaft 16 near the driven shaft 4 is connected to the inner magnetic rotor 11; the isolation sleeve... 10 is located between the inner magnetic rotor 11 and the outer magnetic rotor 8, and the open end of the isolation sleeve 10 is connected to the connector 18; the outer magnetic rotor 8 has a through hole 19, which is used to connect the inner and outer sides of the outer magnetic rotor 8, that is, to realize the communication between the medium and the outside of the isolation sleeve 10; the connector 18 has an air inlet channel 12 and an air outlet channel 15, which are both connected to the inside of the isolation sleeve 10. The air inlet channel 12 is used to introduce external compressed air into the inside of the isolation sleeve 10 to realize the cooling inside the isolation sleeve 10, and the air outlet channel 15 is used to export the heat-exchanged airflow from the inside of the isolation sleeve 10.

[0034] The impeller 2 is driven to rotate by the drive shaft 16. Specifically, the inner magnetic rotor 11 is the driving rotor and the outer magnetic rotor 8 is the driven rotor. That is, the inner magnetic rotor 11 is connected to the drive shaft 16, and the inner magnetic rotor 11 and the outer magnetic rotor 8 are spaced apart. The inner magnetic rotor 11 and the outer magnetic rotor 8 are driven by magnetic force without contact. One end of the driven shaft 4 is connected to the impeller 2 and the other end is connected to the outer magnetic rotor 8, thereby realizing that the drive shaft 16 of the motor drives the impeller 2 to rotate.

[0035] The bracket 9, as a medium contact component, needs to be isolated from the outside environment and is sealed with a static sealing gasket to ensure zero leakage. The outer wall of the bracket 9 is provided with a jacket, which is connected to a cooling component. The cooling component includes a refrigerant storage tank 13, which stores cooling water. The refrigerant storage tank 13 has a cooling water inlet and a cooling water outlet, which are respectively connected to the jacket. This is used to transport the cooling water in the refrigerant storage tank 13 to the jacket to cool the bracket 9 and the medium, and to remove the heat between the isolation sleeve 10 and the bracket 9 in a timely manner, thereby reducing the temperature of the outside of the isolation sleeve 10 and the inside of the bracket 9.

[0036] The inner magnetic rotor 11 is also provided with a forced circulation mechanism 6, which is a fan that provides power for the circulation of compressed air, accelerates the flow of compressed air, and thus removes heat from the isolation sleeve 10 in a timely and large amount, effectively cooling the inside of the isolation sleeve 10.

[0037] The outer magnetic rotor 8 has two through holes 19, which are symmetrically distributed on the outer magnetic rotor 8 with the driven shaft 4 as the center line. They are used to connect the inner and outer sides of the outer magnetic rotor 8, that is, to realize the connection between the medium and the outside of the isolation sleeve 10. The medium inside the pump body 1 is introduced into the space between the outer magnetic rotor 8 and the isolation sleeve 10, so as to cool the outside of the isolation sleeve 10 and balance the pressure on both sides of the isolation sleeve 10.

[0038] The air inlet channel 12 and the air outlet channel 15 are symmetrically distributed on the connector 18 with the drive shaft 16 as the center line. The air inlet channel 12 and the air outlet channel 15 each include a first air duct and a second air duct that are connected to each other. The second air duct is connected to the inside of the isolation sleeve 10. The first air duct is set vertically, and the second air duct is set at an angle. The second air duct is set at an angle toward the driven shaft 4, which helps to guide the compressed air, making it easier to introduce the compressed air into the inside of the isolation sleeve 10 and to export the airflow that has completed heat exchange from the inside of the isolation sleeve 10, thereby improving the flow of the compressed air and achieving effective cooling of the inside of the isolation sleeve 10.

[0039] To ensure reliable rotation of the impeller 2, a sliding bearing assembly 5 is used to support the rotation of the driven shaft 4. Specifically, the driven shaft 4 is installed inside the pump body 1 via the sliding bearing assembly 5. The sliding bearing assembly 5 includes a sliding bearing seat 51, a sliding bearing 52, and a bushing 53. The sliding bearing seat 51 is fixed to the pump body 1, the bushing 53 is fitted onto the driven shaft 4, and the sliding bearing 52 is positioned between the sliding bearing seat 51 and the bushing 53. During operation, a certain thickness of "oil film" is generated between the sliding bearing 52 and the bushing 53. This "oil film" improves the support stability and rotational accuracy of the driven shaft 4, reduces friction and wear, and extends the service life of the bearing and the driven shaft 4. The assembly also includes a thrust bearing assembly 7, which is fitted onto the driven shaft 4 to prevent axial movement of the driven shaft 4.

[0040] The pump body 1 is also provided with a pump cover 3, which is installed at the end of the pump body 1 away from the bearing housing 14. It is used to seal the internal cavity of the pump body 1, ensure that the inside of the pump body 1 is isolated from the external environment, prevent media leakage and external pollutants from entering, and facilitate the maintenance and repair of the internal components of the pump body 1 by the staff.

[0041] The dry-running magnetic pump provided by this utility model can effectively cool the inside and outside of the isolation sleeve 10 and the inside of the bracket 9. Specifically, compressed air is used to cool the inside of the isolation sleeve 10. Compressed air is introduced into the isolation sleeve 10 through the air inlet channel 12, and after heat exchange inside the isolation sleeve 10, it is discharged through the air outlet channel 15, thereby removing the heat inside the isolation sleeve 10 in a timely manner and preventing the temperature from rising. Cooling water is used to cool the cavity between the isolation sleeve 10 and the bracket 9. By setting a jacket and a cooling component on the outer wall of the bracket 9, the cooling water circulating in the cooling component promptly removes the heat from the isolation sleeve 10. The heat between the isolation sleeve 10 and the bracket 9 (i.e., the outside of the isolation sleeve 10 and the inside of the bracket 9) is prevented from rising; in the event of medium cavitation or pump dry operation, the internal temperature of the pump is effectively reduced, ensuring stable pump operation; the connection method between the motor drive shaft 16 and the outer magnetic rotor is changed to the connection method between the motor drive shaft 16 and the inner magnetic rotor 11, changing the pressure of the internal medium on the isolation sleeve 10 to the pressure of the external medium, so that the outside of the isolation sleeve 10 is subjected to the pressure from the medium, and the inside is subjected to the pressure of the compressed air introduced, thereby balancing the pressure inside and outside the isolation sleeve 10 and preventing the isolation sleeve 10 from being damaged due to pressure difference.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dry-running magnetic pump, characterized in that, The pump body includes a pump body (1), an impeller (2), a driven shaft (4), an outer magnetic rotor (8), a bracket (9), an isolation sleeve (10), an inner magnetic rotor (11), a bearing housing (14), a drive shaft (16), and a connecting piece (18). The pump body (1), bracket (9), connecting piece (18), and bearing housing (14) are connected in sequence. The pump body (1) has a cavity inside, and the impeller (2) and driven shaft (4) are both located in the cavity. One end of the driven shaft (4) is connected to the impeller (2), and the other end is connected to the outer magnetic rotor (8). A through hole (19) is opened on the bearing housing (14); the drive shaft (16) is disposed inside the bearing housing (14), and the end of the drive shaft (16) near the driven shaft (4) is connected to the inner magnetic rotor (11); the isolation sleeve (10) is located between the inner magnetic rotor (11) and the outer magnetic rotor (8), and the open end of the isolation sleeve (10) is connected to the connector (18); an air inlet channel (12) and an air outlet channel (15) are opened on the connector (18), and the air inlet channel (12) and the air outlet channel (15) are both connected to the interior of the isolation sleeve (10).

2. The dry-operable magnetic pump according to claim 1, characterized in that, The outer wall of the bracket (9) is provided with a jacket, and the jacket is connected to a cooling component.

3. The dry-operable magnetic pump according to claim 2, characterized in that, The cooling component includes a refrigerant storage tank (13), which is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected to the jacket.

4. The dry-operable magnetic pump according to claim 1, characterized in that, The internal magnetic rotor (11) is provided with a forced circulation mechanism (6).

5. The dry-operable magnetic pump according to claim 1, characterized in that, The through holes (19) are provided in multiple ways. The multiple through holes (19) are evenly or spaced out on the outer magnetic rotor (8) to connect the inner and outer sides of the outer magnetic rotor (8).

6. The dry-operable magnetic pump according to claim 1, characterized in that, The air inlet channel (12) and the air outlet channel (15) are spaced apart or symmetrically distributed on the connector (18).

7. The dry-operable magnetic pump according to claim 1, characterized in that, The air inlet channel (12) and the air outlet channel (15) both include a first air duct and a second air duct that are connected to each other. The second air duct is connected to the interior of the isolation sleeve (10). The first air duct is set vertically and the second air duct is set at an angle.

8. The dry-operable magnetic pump according to claim 1, characterized in that, It also includes a sliding bearing assembly (5) and a thrust bearing assembly (7). The sliding bearing assembly (5) includes a sliding bearing seat (51), a sliding bearing (52) and a bushing (53). The sliding bearing seat (51) is fixed on the pump body (1). The bushing (53) is sleeved on the driven shaft (4). The sliding bearing (52) is disposed between the sliding bearing seat (51) and the bushing (53). The thrust bearing assembly (7) is sleeved on the driven shaft (4).

9. The dry-operable magnetic pump according to claim 1, characterized in that, It also includes a pump cover (3), which is installed at one end of the pump body (1) away from the bearing housing (14).

10. The dry-operable magnetic pump according to any one of claims 1-9, characterized in that, Compressed air is introduced into the isolation sleeve (10), and the compressed air enters through the air inlet channel (12) and is discharged through the air outlet channel (15).

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