Shielded pump

Abstract

A canned motor pump comprises a pump head, an impeller, a rotor, a stator, a casing and a canned cover, the stator is arranged in the casing, the rotor is arranged in the inner cavity of the stator and can rotate, the canned cover seals and separates the rotor and the stator, and the casing is assembled on the pump head, characterized in that an end cover is arranged on the water inlet port of the pump head, the middle part of the end cover has a support part extending into the inner cavity of the pump head, the rotor is axially hollow to form an axial inner cavity, the axial inner cavity is provided with a ceramic shaft, the front end of the ceramic shaft is positioned on the support part, the rear end is fixed at the center position of the canned cover, and the rotor can rotate around the outer wall of the ceramic shaft.

Description

Technical Field

[0001] This utility model relates to a water pressurization device, and more particularly to a water pump. Background Technology

[0002] Existing canned motor pumps incorporate a rotor shield between the stator and rotor assemblies of the motor, physically isolating the stator assembly from the liquid medium being pumped. This design allows the pump head and rotor assembly to be connected, enabling the liquid medium to enter the rotor assembly from the pump head, thus providing heat dissipation. This design avoids the need for a dynamic seal on the shaft, a requirement of traditional structures, significantly increasing the reliability of the pump system.

[0003] However, the existing shielding cover assembly is rather cumbersome and needs improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a shielded pump with a convenient shielding cover assembly, in view of the above-mentioned technical status.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a shielded pump, including a pump head, an impeller, a rotor, a stator, a housing, and a shield. The pump head has an inner cavity and an inlet port and an outlet port communicating with the inner cavity. The impeller is connected to the rotor and located in the inner cavity of the pump head. The stator is located in the housing. The rotor is located in the inner cavity of the stator and can rotate. The shield seals and separates the rotor and the stator. The housing is assembled on the pump head. The pump head has an end cap on the inlet port, and the middle of the end cap has a support portion that extends into the inner cavity of the pump head. The rotor is axially hollow to form an axial inner cavity. The axial inner cavity has a ceramic shaft. The front end of the ceramic shaft is positioned on the aforementioned support portion, and the rear end is connected to the center of the shield. The rotor can rotate around the outer wall of the ceramic shaft.

[0006] Furthermore, a water inlet connector is connected to the front end of the end cap.

[0007] The preferred connection method for the rear end of the ceramic shaft is as follows: the rear end of the ceramic shaft is provided with a connecting seat, which is located at the bottom of the inner side of the shield. The outer side of the rear end of the shield is provided with a positioning sleeve. A fastener passes through the positioning sleeve from back to front and extends into the shield to be connected to the connecting seat as a whole.

[0008] Furthermore, a gasket is provided at the rear end of the ceramic shaft, which separates the connecting seat from the rotor.

[0009] Furthermore, the support portion has a shaft groove for the front end of the ceramic shaft.

[0010] Compared with existing technologies, the advantages of this invention are as follows: During assembly, the ceramic shaft is inserted into the connecting seat for fixation, then the stainless steel shielding cover is inserted, followed by the positioning sleeve, and finally fastened with fasteners. This simplifies the manufacturing process and facilitates easy assembly while ensuring concentricity between the ceramic shaft and the shielding cover. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment.

[0012] Figure 2 An exploded view of the water inlet connector and pump body in the embodiment.

[0013] Figure 3 for Figure 2 Enlarged three-dimensional sectional view of the pump body.

[0014] Figure 4 for Figure 2 Exploded view of the pump body.

[0015] Figure 5 for Figure 4 Another structural diagram of the middle end cap. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 and Figure 2 As shown, the shielded pump in this embodiment includes a pump body 10 and a water inlet connector 20 disposed on the pump body 10.

[0018] like Figure 3 , Figure 4 and Figure 5 As shown, the pump body 10 in this embodiment includes a pump head 1, an end cover 2, a ceramic shaft 4, an impeller 31, a rotor 3, a stator 8, a housing 7, and a shield 6. The pump head 1 has an inner cavity and an inlet port 11 and an outlet port 12 communicating with the inner cavity. The impeller 31 is connected to the rotor 3 and located in the inner cavity of the pump head 1. The stator 8 is located inside the housing 7, and the rotor 3 is located in the inner cavity of the stator 8 and can rotate. The shield 6 seals and separates the rotor 3 and the stator 8. The housing 7 is assembled on the pump head 1. An end cover 2 is provided on the inlet port 11 of the pump head 1, and an inlet connector 20 is connected to the front end of the end cover 2. The middle part of the end cover 2 has a support part 21 that extends into the inner cavity of the pump head 1, and the support part 21 has a shaft groove 22 for the front end of the ceramic shaft 4.

[0019] The rotor 3 is axially hollow to form an axial inner cavity, which houses a ceramic shaft 4. The front end of the ceramic shaft 4 is positioned on the support 21, and the rear end is connected to the center of the shield 6. The rotor 3 can rotate around the outer wall of the ceramic shaft 4. A gasket 41 is provided at the rear end of the ceramic shaft 4, which separates the connecting seat 51 from the rotor 3.

[0020] The ceramic shaft 4 has a connecting seat 51 at its rear end, which is located at the bottom inside the shield 6. The shield 6 has a positioning sleeve 52 on its outer rear end. The fastener 53 passes through the positioning sleeve 52 from back to front and extends into the shield 6 to be connected to the connecting seat 51 as a whole. In this embodiment, the fastener 53 is a bolt.

[0021] The ceramic shaft is secured by inserting a washer into a connector, then a stainless steel shield is inserted, followed by a positioning sleeve, and finally fastened with fasteners. This simple manufacturing process and easy assembly ensure that the ceramic shaft and shield are concentric.

Claims

1. A canned pump, comprising a pump head (1), an impeller (31), a rotor (3), a stator (8), a housing (7), and a shield (6), wherein the pump head (1) has an inner cavity and an inlet port (11) and an outlet port (12) communicating with the inner cavity; the impeller (31) is connected to the rotor (3) and located in the inner cavity of the pump head (1); the stator (8) is disposed in the housing (7); the rotor (3) is disposed in the inner cavity of the stator (8) and is rotatable; the shield (6) seals and separates the rotor (3) and the stator (8); and the housing (7) is mounted on the pump head (1), characterized in that... The pump head (1) has an end cap (2) on its inlet port (11). The end cap (2) has a support part (21) that extends into the inner cavity of the pump head (1). The rotor (3) is axially hollow to form an axial inner cavity. The axial inner cavity is provided with a ceramic shaft (4). The front end of the ceramic shaft (4) is positioned on the aforementioned support part (21), and the rear end is connected to the center of the shield (6). The rotor (3) can rotate around the outer wall of the ceramic shaft (4). The ceramic shaft (4) is provided with a connecting seat (51) at its rear end. The connecting seat (51) is located at the bottom of the inner side of the shield (6). The outer side of the rear end of the shield (6) is provided with a positioning sleeve (52). A fastener (53) passes through the positioning sleeve (52) from back to front and extends into the shield (6) to be connected with the connecting seat (51) as a whole.

2. The canned pump according to claim 1, characterized in that... The end cap (2) is connected to a water inlet connector (20) at its front end.

3. The shielded pump according to claim 1, characterized in that... The ceramic shaft (4) has a gasket (41) at its rear end, which separates the connecting seat (51) from the rotor (3).

4. The shielded pump according to claim 1, characterized in that... The support (21) has a shaft groove (22) for the front end of the ceramic shaft (4).

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