High-smoothness shielding electric pump

Abstract

The utility model relates to a high-fluency shielding electric pump, which comprises a pump cavity mechanism, a front bearing seat and an impeller, the pump cavity mechanism comprises a pump body, a front bearing seat and a rear bearing seat, a pump cavity is defined by the front bearing seat and the pump body, and the impeller is arranged in the pump cavity; the driving mechanism comprises a pump shaft, a front bearing sealing assembly, a rotor assembly, a rear bearing sealing assembly and a rear bearing seat, one end of the pump shaft is in transmission connection with the impeller, the pump shaft is sequentially sleeved with the front bearing sealing assembly, the rotor assembly, the rear bearing sealing assembly and the rear bearing seat, and a stator assembly and a pump shell are arranged on the outer side of the rotor assembly; the circulating mechanism comprises an auxiliary impeller arranged on the pump shaft in a sleeving mode, a circulating pipe with one end connected with the rear bearing seat and the other end connected with the pump body, a pressure measuring device communicated with the circulating pipe and an adjusting switch arranged on the rear bearing seat. According to the utility model, the medium can be safely and efficiently conveyed, the internal high-pressure environment is reasonably utilized, the normal work of the pressure regulating pipe is ensured, the internal air pressure is regulated and controlled by utilizing the pressure measuring device, the overall explosion-proof effect is ensured while intelligentization is realized, and the function of highly smoothly conveying the medium is realized.

Description

Technical Field

[0001] This utility model relates to the field of shielded electric pump technology, specifically to a high-fluidity shielded electric pump. Background Technology

[0002] When using canned motor pumps to transport easily vaporized media, a reverse circulation type canned motor pump is typically selected. The reverse circulation type canned motor pump uses a liquid flow direction opposite to that of the basic type, for bearing lubrication and cooling, as well as motor cooling; hence the name reverse circulation. When easily vaporized liquids are used in applications with a small net positive suction head (NPSH) margin, the circulating liquid will be affected by heat from the motor and bearing friction, causing the liquid temperature to rise. If a basic type canned motor pump is used, the circulating liquid will return to the low-pressure area at the impeller inlet, potentially leading to cavitation and preventing the pump from operating normally. In a reverse circulation pump, the circulating liquid returns to the suction tank, thus avoiding cavitation. The circulating liquid in a reverse circulation pump flows from the impeller outlet through the liquid passage hole on the front bearing housing → the gap between the stator and rotor shielding sleeves → the gap between the rear bearing and the rear side shaft sleeve → the rear bearing housing → back to the suction tank. Additionally, a portion of the circulating liquid passing through the liquid passage hole on the front bearing housing flows through the gap between the front bearing and the front side shaft sleeve → the gap between the front bearing housing and the impeller hub → to the impeller inlet. Reverse circulation pump piping: The reverse circulation line must be connected to the vapor phase zone of the suction tank. When using a reverse circulation canned motor pump to transport easily vaporized media, the following two conditions must be met:

[0003] 1. The total head (resistance) of the reverse circulation piping is ≤ 0.2 times the pump head;

[0004] 2. The reverse circulation pipeline must be connected to the vapor phase zone of the suction tank.

[0005] However, in actual use, due to limitations of on-site conditions or special requirements of customers, the following defects exist:

[0006] 1. Reverse circulation piping has high requirements, the equipment is highly specialized, it is not easy to use, and the cost is high;

[0007] 2. In some cases, the reverse circulation pipe is long or the pipeline layout is complex, and the total resistance of the reverse circulation pipe is greater than 0.2 times the head, resulting in insufficient reverse circulation flow and thus preventing the pump from working properly.

[0008] 3. There is no space for piping, making reverse circulation piping impossible;

[0009] 4. Due to limitations of the site conditions, the circulating liquid cannot return to the vapor phase zone of the suction tank, etc. Utility Model Content

[0010] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a high-flow-rate shielded electric pump.

[0011] The objective of this utility model can be achieved through the following technical solutions:

[0012] A high-fluidity shielded electric pump, comprising:

[0013] The pump chamber mechanism includes a pump body, a front bearing housing that surrounds the pump body to form a pump chamber, and an impeller disposed within the pump chamber;

[0014] The drive mechanism includes a pump shaft with one end connected to the impeller drive, and a front bearing sealing assembly, a rotor assembly, a rear bearing sealing assembly, and a rear bearing housing sequentially sleeved on the pump shaft. A stator assembly and a pump housing are provided on the outside of the rotor assembly. The front bearing sealing assembly and the rear bearing sealing assembly each contain accessories such as bearing housing, bearing, bushing, thrust disc, and mechanical seal.

[0015] The circulation mechanism includes an auxiliary impeller sleeved on the pump shaft, a circulation pipe with one end connected to the rear bearing housing and the other end connected to the pump body, a pressure sensor communicating with the circulation pipe, and an adjustment switch disposed on the rear bearing housing.

[0016] Furthermore, the auxiliary impeller is disposed on the side of the pump shaft near the rotor assembly.

[0017] Furthermore, the secondary impeller has four or more blades.

[0018] Furthermore, an impeller nut is provided between the pump shaft and the impeller for connecting the two.

[0019] Furthermore, the front bearing housing is sleeved on the pump shaft, and the front bearing sealing assembly is disposed within the front bearing housing.

[0020] Furthermore, a stator front flange is provided between the stator assembly and the front bearing housing to connect the two.

[0021] Furthermore, a stator rear flange is provided between the stator assembly and the rear bearing housing to connect the two.

[0022] Furthermore, the shielded electric pump is also equipped with a junction box that is electrically connected to the stator assembly.

[0023] Furthermore, the shielded electric pump is also provided with a support for supporting the stator assembly.

[0024] Furthermore, the shielded electric pump also includes a water cooling mechanism, which includes an outer cooling shell disposed outside the pump casing, and the outer cooling shell is provided with a water inlet and a water outlet.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) This utility model provides a high-flow shielded electric pump, which can safely and efficiently transport media, make reasonable use of the internal high-pressure environment, ensure that the pressure regulating tube can work normally, use a pressure sensor to regulate the internal air pressure, ensure the overall explosion-proof effect while being intelligent, and play the role of high-flow media transport.

[0027] (2) This utility model provides a high-flow shielded electric pump. The shielded electric pump is equipped with an outer cold shell, which can effectively cool down the pump and prevent the internal temperature from rising too quickly in an instant, thus preventing unnecessary safety hazards. It can also help regulate the air pressure. When the temperature decreases, the air pressure decreases, thus preventing the shielded electric pump from exploding. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the high-fluidity shielded electric pump in the embodiment;

[0029] Figure 2 This is a schematic diagram of a high-fluidity shielded electric pump with an outer cooling shell, as shown in the embodiment.

[0030] The numbers in the diagram indicate: 1-Pump body; 2-Impeller; 3-Front bearing housing; 4-Stator front flange; 5-Front bearing sealing assembly; 6-Pump shaft; 7-Rotor assembly; 8-Stator assembly; 9-Pump casing; 10-Rear bearing sealing assembly; 11-Rear bearing housing; 12-Circulation pipe; 13-Regulating switch; 14-Stator rear flange; 15-Support body; 16-Pressure sensor; 17-Junction box; 18-Outer cooling shell; 19-Auxiliary impeller. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0032] Example

[0033] This embodiment provides a high-fluidity shielded electric pump; the specific structure is shown in [reference needed]. Figures 1-2 ,include:

[0034] The pump chamber mechanism includes a pump body 1, a front bearing seat 3 that surrounds the pump body 1 to form a pump chamber, and an impeller 2 disposed in the pump chamber;

[0035] The drive mechanism includes a pump shaft 6 with one end connected to the impeller 2 for transmission, and a front bearing sealing assembly 5, a rotor assembly 7, a rear bearing sealing assembly 10 and a rear bearing housing 11 sequentially sleeved on the pump shaft 6. A stator assembly 8 and a pump housing 9 are provided on the outside of the rotor assembly 7. The front bearing sealing assembly 5 and the rear bearing sealing assembly 10 each contain accessories such as bearing housing, bearing, bushing, thrust disc and mechanical seal.

[0036] The circulation mechanism includes an auxiliary impeller 19 sleeved on the pump shaft 6, a circulation pipe 12 connected at one end to the rear bearing seat 11 and at the other end to the pump body 1, a pressure sensor 16 communicating with the circulation pipe 12, and an adjustment switch 13 provided on the rear bearing seat 11.

[0037] In this embodiment, the auxiliary impeller 19 is disposed on the side of the pump shaft 6 near the rotor assembly 7.

[0038] In this embodiment, the secondary impeller 19 has four or more blades.

[0039] In this embodiment, an impeller nut is provided between the pump shaft 6 and the impeller 2 to connect the two.

[0040] In this embodiment, the front bearing housing 3 is sleeved on the pump shaft 6, and the front bearing sealing assembly 5 is disposed inside the front bearing housing 3.

[0041] In this embodiment, a stator front flange 4 is provided between the stator assembly 8 and the front bearing housing 3 to connect the two.

[0042] In this embodiment, a stator rear flange 14 is provided between the stator assembly 8 and the rear bearing housing 11 to connect the two.

[0043] In this embodiment, the shielded electric pump is further provided with a junction box 17 that is electrically connected to the stator assembly 14.

[0044] In this embodiment, the shielded electric pump is further provided with a support body 15 for supporting the stator assembly 14.

[0045] In this embodiment, optionally, the shielded electric pump further includes a water-cooling mechanism, which includes an outer cooling shell 18 disposed outside the pump casing 9. The outer cooling shell 18 is provided with a water inlet and a water outlet. Figure 2 .

[0046] Working principle:

[0047] In this embodiment, the shielded electric pump places the stator assembly 8 and rotor assembly 7 in a sealed metal cylinder and drives them through a shielded motor. The pump casing 9 is connected to the drive motor housing by a flange seal, eliminating the pump shaft dynamic seal structure. The motor and pump are integrated into a single structure, and all are statically sealed, making the electric pump completely leak-free. Under high temperature and pressure conditions, the pressure gauge 16 detects that the internal pressure of the pump body is too high. The circulation pipe 12 is opened by adjusting the switch 13. The rotor shaft is equipped with an auxiliary impeller 19. The inner side of the auxiliary impeller 19, corresponding to the rotor assembly 7, is evenly distributed with four or more blades arranged in a cross shape. The outer side of the auxiliary impeller 19 is equipped with a cover plate. The auxiliary impeller 19 on the rotor assembly 7 pressurizes and delivers the circulating liquid, ensuring that the circulating liquid can smoothly return to the pump body outlet. At the same time, the special sealing structure formed between the hard alloy layer on the impeller 2 hub and the sealing ring controls the amount of circulating liquid returning to the low-pressure area of ​​the impeller, effectively preventing the cavitation of the impeller 2. It can utilize the internal high pressure and achieve safe delivery.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A high-fluxability canned motor pump characterized by, The shielded electric pump comprises a pump cavity mechanism, a driving mechanism, and a circulating mechanism. The pump cavity mechanism comprises a pump body (1), a front bearing seat (3) which forms a pump cavity together with the pump body (1), and an impeller (2) arranged in the pump cavity. The driving mechanism comprises a pump shaft (6) which is in driving connection with the impeller (2), a front bearing sealing assembly (5), a rotor assembly (7), a rear bearing sealing assembly (10), and a rear bearing seat (11) which are sequentially sleeved on the pump shaft (6), and a stator assembly (8) and a pump shell (9) which are arranged outside the rotor assembly (7). The circulating mechanism comprises a secondary impeller (19) which is sleeved on the pump shaft (6), a circulating pipe (12) which is connected to the rear bearing seat (11) at one end and connected to the pump body (1) at the other end, a pressure gauge (16) which is in communication with the circulating pipe (12), and an adjusting switch (13) which is arranged on the rear bearing seat (11).

2. A high-fluxability canned motor pump according to claim 1, characterized in that, The secondary impeller (19) is arranged on the side of the pump shaft (6) close to the rotor assembly (7).

3. A high-flux hermetic canned electric pump according to claim 1, characterized in that, A pump nut is arranged between the pump shaft (6) and the impeller (2) for connecting the two.

4. A high-flux hermetic canned electric pump according to claim 1, characterized in that, The front bearing seat (3) is sleeved on the pump shaft (6), and the front bearing sealing assembly (5) is arranged in the front bearing seat (3).

5. A high-fluxability canned motor pump according to claim 1, characterized in that, A stator front flange (4) is arranged between the stator assembly (8) and the front bearing seat (3) for connecting the two.

6. A high-fluxability canned electric pump according to claim 1, characterized in that, A stator rear flange (14) is arranged between the stator assembly (8) and the rear bearing seat (11) for connecting the two.

7. A high-fluxability canned electric pump according to claim 1, characterized in that, The shielded electric pump is further provided with a junction box (17) which is in electrical connection with the stator assembly (8).

8. A high-fluxability canned electric pump according to claim 1, characterized in that, The shielded electric pump is further provided with a support body (15) for supporting the stator assembly (8).

9. A high-fluxability canned electric pump according to claim 1, characterized in that, The shielded electric pump further comprises a water cooling mechanism which comprises an outer cooling shell (18) arranged outside the pump shell (9), and a water inlet and a water outlet are arranged on the outer cooling shell (18).

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