Oil immersed semi-submersible heat exchange sewage electric pump

Abstract

The utility model relates to sewage electric pump technical field, concretely relates to an oil immersed semi-submersible heat exchange sewage electric pump, mainly solves the technical problem that the cooling effect and structure cost of existing oil immersed semi-submersible sewage electric pump cannot be considered, this electric pump includes motor assembly, pump body subassembly, oil suction cavity, base, oil inlet pipe, oil outlet pipe and pump oil impeller, and motor assembly includes casing and rotating shaft, and the lower end of casing is equipped with lower end cover, and pump body subassembly includes volute and pump water impeller, and oil suction cavity is located in lower end cover, and base is equipped with upper water channel and cooling oil channel, and pump oil impeller is located in oil suction cavity. This electric pump can realize oil cooling and temperature reduction by sewage, and the cooling effect is better, and also need not extra cooling structure, and the equipment cost is also lower, namely can consider cooling effect and structure cost.

Description

Technical Field

[0001] This utility model relates to the field of sewage electric pump technology, and in particular to an oil-immersed semi-submersible heat exchange sewage electric pump. Background Technology

[0002] Oil-immersed electric pumps are those in which key components such as the motor stator and rotor are completely encased in insulating oil, and cooling, sealing, and lubrication are achieved through the circulation of the insulating oil. Semi-submersible electric pumps, on the other hand, employ a segmented protective design, with a submerged section at the bottom and an exposed section at the top. Oil-immersed semi-submersible electric pumps combine the structural designs of both, possessing the strong sealing performance of oil-immersed pumps and the low-level adaptability of semi-submersible pumps, making them particularly suitable for use as sewage pumps.

[0003] In the existing technology, the insulating oil cooling of oil-immersed semi-submersible sewage pumps is generally still achieved through the natural circulation or forced circulation of the oil-immersed pump itself. Natural circulation has poor cooling effect, while forced circulation requires additional cooling structure, which has a high structural cost.

[0004] Therefore, there is an urgent need for an oil-immersed semi-submersible sewage pump with good cooling effect and low structural cost. Utility Model Content

[0005] To overcome the technical shortcomings of existing oil-immersed semi-submersible sewage pumps where cooling effect and structural cost cannot be simultaneously achieved, this utility model provides an oil-immersed semi-submersible heat exchange sewage pump.

[0006] This utility model provides an oil-immersed semi-submersible heat exchange sewage electric pump, comprising a motor assembly and a pump body assembly. The motor assembly includes a housing and a rotating shaft. The housing forms a sealed oil storage chamber and has a lower end cover. The rotating shaft passes through the lower end cover and forms an extended shaft section. The rotating shaft and the lower end cover are rotary sealed by a mechanical seal structure. The pump body assembly includes a volute and a pump impeller. The pump impeller is fixed on the extended shaft section and placed inside the volute. The volute has an inlet at its bottom and an outlet on its side wall. The pump body assembly is characterized by further comprising: An oil suction chamber is formed inside the lower end cover, the top of the oil suction chamber is connected to the oil storage chamber, and the oil suction chamber is located above the mechanical seal structure; The base is connected to the water inlet below the vortex shell and forms a water inlet channel. The base is also provided with a cooling oil channel, which surrounds the water inlet channel. An oil inlet pipe, the upper end of which is connected to the top of the oil storage chamber and the lower end of which is connected to the cooling oil passage; An oil outlet pipe, the upper end of which is connected to the oil suction chamber and the lower end of which is connected to the cooling oil passage; The oil pump impeller is fixed on the rotating shaft and placed in the oil suction chamber. The oil pump impeller is used to pump the oil in the oil suction chamber into the oil storage chamber in sequence through the oil outlet pipe, the cooling oil passage and the oil inlet pipe.

[0007] Optionally, the bottom of the base forms a water inlet cavity, and a water inlet is provided on one side of the water inlet cavity. The top of the base is provided with an annular cavity. The inner hole of the annular cavity is located directly below the water inlet and forms the water inlet channel. The cooling oil channel is arranged in the annular cavity.

[0008] Optionally, the cooling oil passages are arranged in a spiral shape.

[0009] Optionally, a filter is connected in series at the lower end of the oil inlet pipe.

[0010] Optionally, the top side wall of the housing is provided with a first oil injection hole, and the upper end of the oil inlet pipe is provided with a second oil injection hole.

[0011] Optionally, the lower end cover includes a mounting cover and a connecting cover. The mounting cover is fixed to the lower end of the housing and a bearing is installed between it and the rotating shaft. The connecting cover is connected between the mounting cover and the volute housing. The mechanical seal structure is installed between the connecting cover and the rotating shaft. The radial outer side of the mounting cover is sealed to the connecting cover, and the radial inner side of the mounting cover forms the oil suction chamber with the connecting cover. The oil suction chamber is connected to the oil outlet pipe through an oil outlet channel provided in the mounting cover.

[0012] Optionally, the pump impeller is a hollow structure to form an oil passage cavity, the top of which is located directly below the bearing, and the bottom of which is arranged corresponding to the oil outlet channel.

[0013] The technical solution provided by this utility model has the following advantages compared with the prior art: This utility model provides an oil-immersed semi-submersible heat exchange sewage pump, which includes an oil suction chamber, a base, an oil inlet pipe, an oil outlet pipe, and a pump impeller. The pump impeller pumps the oil in the suction chamber sequentially through the oil outlet pipe, cooling oil channel, and oil inlet pipe into the oil storage chamber, thereby achieving oil circulation in the storage chamber. Furthermore, when the oil recirculates to the cooling oil channel, it exchanges heat with the sewage in the upper water channel, achieving cooling. Thus, this pump utilizes sewage to cool the oil, resulting in good cooling performance. It also eliminates the need for additional cooling structures, leading to lower equipment costs, thus balancing cooling effectiveness and structural cost. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0015] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the oil-immersed semi-submersible heat exchange sewage electric pump in the embodiment of this utility model; Figure 2 express Figure 1 A magnified view of a portion of point A in the middle.

[0017] In the picture: 1. Motor assembly; 11. Housing; 111. Oil reservoir; 112. Lower end cover; 1121. Mounting cover; 1122. Connecting cover; 1123. Oil outlet channel; 113. Mechanical seal structure; 114. First oil filling hole; 12. Shaft; 121. Extended shaft section; 13. Bearing; 14. Rotor core; 15. Electrical control components; 16. Upper end cover; 17. Stator core; 2. Pump body Components; 21. Volute; 211. Water inlet; 212. Water outlet; 22. Pump impeller; 23. Rotary sealing structure; 3. Oil suction chamber; 4. Base; 41. Water inlet channel; 42. Cooling oil channel; 43. Water inlet chamber; 44. Water inlet; 45. Annular cavity; 5. Oil inlet pipe; 51. Filter; 52. Second oil injection hole; 6. Oil outlet pipe; 7. Pump impeller; 71. Oil passage chamber; Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0019] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0021] The following is combined with Figure 1 and Figure 2 The specific embodiments of this utility model will be described in detail below.

[0022] This embodiment provides an oil-immersed semi-submersible heat exchange sewage electric pump, including a motor assembly 1, a pump body assembly 2, an oil suction chamber 3, a base 4, an oil inlet pipe 5, an oil outlet pipe 6, and a pump impeller 7.

[0023] The motor assembly 1 includes a housing 11 and a rotating shaft 12. The housing 11 forms a sealed oil storage chamber 111 and has a lower end cover 112 at its lower end. The rotating shaft 12 passes through the lower end cover 112 and forms an extended shaft section 121. The rotating shaft 12 and the lower end cover 112 are rotary sealed by a mechanical seal structure 113.

[0024] It should be noted that the motor assembly 1 is prior art. The above only lists the components related to the improvement of this application. In addition, the motor assembly 1 should also include necessary components such as rotor core 14, electrical control components 15, upper end cover 16, and stator core 17.

[0025] Specifically, the top side wall of the housing 11 is provided with a first oil injection hole 114, through which oil can be injected into the oil storage chamber 111 so that the corresponding components of the motor assembly 1 can be immersed in the oil, thus forming an oil-immersed electric pump.

[0026] The pump body assembly 2 includes a volute 21 and a pump impeller 22. The pump impeller 22 is fixed on the extended shaft section 121 and placed inside the volute 21. The bottom of the volute 21 is provided with an inlet 211 and the side wall is provided with an outlet 212.

[0027] It should be noted that the pump body assembly 2 is prior art. The above only lists the components related to the improvement of this application. In addition, the pump body assembly 2 should also include a rotary sealing structure 23 located between the top of the volute 21 and the rotating shaft 12 to prevent sewage from leaking to the outside of the volute 21.

[0028] Specifically, the volute 21 includes a volute cover and a volute cap. The volute cover is fixed to the bottom of the volute cap by bolts, and the aforementioned rotary sealing structure 23 is between the volute cap and the rotating shaft 12.

[0029] It should be noted that, for the sake of clear structural display, Figure 1 The connection between the outlet 212 and the volute 21 is omitted, but the outlet 212 should be designed according to the flow path of the pump impeller 22, and the outlet 212 should be directly or indirectly connected to the volute 21 to realize the communication between the outlet 212 and the internal space of the volute 21.

[0030] The oil suction chamber 3 is located inside the lower end cover 112, and the top of the oil suction chamber 3 is connected to the oil storage chamber 111. The oil suction chamber 3 is located above the mechanical seal structure 113.

[0031] Specifically, the lower end cover 112 includes a mounting cover 1121 and a connecting cover 1122. The mounting cover 1121 is fixed to the lower end of the housing 11 and a bearing 13 is installed between it and the rotating shaft 12. The connecting cover 1122 is connected between the mounting cover 1121 and the volute 21, and a mechanical seal structure 113 is installed between the connecting cover 1122 and the rotating shaft 12. The radial outer surface of the mounting cover 1121 is in sealing contact with the connecting cover 1122, and the radial inner surface of the mounting cover 1121 forms an oil suction chamber 3 with the connecting cover 1122. The oil suction chamber 3 is connected to the oil outlet pipe 6 through an oil outlet channel 1123 located in the mounting cover 1121. Designing the lower end cover 112 as a split structure is more conducive to installation and the formation of the oil suction chamber 3.

[0032] It should be noted that the so-called oil suction chamber 3 is used in conjunction with the oil pump impeller 7 described later to draw oil from the oil storage chamber 111 into the oil suction chamber 3 to complete the oil circulation.

[0033] The base 4 is connected to the water inlet 211 of the vortex shell 21 and forms a water inlet channel 41. The base 4 is also provided with a cooling oil channel 42, which surrounds the water inlet channel 41.

[0034] It is easy to understand that the main purpose of the cooling oil passage 42 surrounding the water supply passage 41 is to enable the oil in the cooling oil passage 42 to fully exchange heat with the water in the passage.

[0035] Specifically, the bottom of the base 4 forms a water inlet cavity 43, and a water inlet 44 is provided on one side of the water inlet cavity 43. The top of the base 4 is provided with an annular cavity 45. The inner hole of the annular cavity 45 is located directly below the water inlet 211 and forms a water inlet channel 41. The cooling oil channel 42 is arranged inside the annular cavity 45. This is only a preferred structure of the base 4. As an alternative, the base 4 can also be a hollow column, with the cooling oil channel 42 surrounding the outer side of the top of the base 4.

[0036] More specifically, the cooling oil passages 42 are arranged in a spiral shape. The spiral-shaped cooling oil passages 42 can improve the heat dissipation effect of the oil inside.

[0037] The upper end of the oil inlet pipe 5 is connected to the top of the oil storage chamber 111, and the lower end is connected to the cooling oil passage 42. The oil inlet pipe 5 mainly serves as a channel for oil to flow from the cooling oil passage 42 to the oil storage chamber 111.

[0038] Furthermore, a filter 51 is connected in series at the lower end of the oil inlet pipe 5. The filter 51 can filter out impurities in the oil, ensuring the cleanliness of the oil entering the oil storage chamber 111.

[0039] Furthermore, the upper end of the oil inlet pipe 5 is provided with a second oil injection hole 52. Oil can be injected into the oil inlet pipe 5 through the second oil injection hole 52, so that the oil flows into the oil storage chamber 111. This, together with the first oil injection hole 114, can improve the oil injection efficiency.

[0040] The upper end of the oil outlet pipe 6 is connected to the oil suction chamber 3, and the lower end is connected to the cooling oil passage 42. The oil outlet pipe 6 mainly serves as a channel for oil in the oil suction chamber 3 to flow to the cooling oil passage 42.

[0041] The oil pump impeller 7 is fixed on the rotating shaft 12 and placed in the oil suction chamber 3. The oil pump impeller 7 is used to pump the oil in the oil suction chamber 3 into the oil storage chamber 111 after passing through the oil outlet pipe 6, the cooling oil passage 42 and the oil inlet pipe 5 in sequence.

[0042] It is easy to understand that the pump impeller 7 mainly provides power for the circulation of oil.

[0043] Specifically, the pump impeller 7 has a hollow structure to form an oil passage cavity 71. The top of the oil passage cavity 71 is located directly below the bearing 13, and the bottom of the oil passage cavity 71 is arranged corresponding to the oil outlet channel 1123. The design of the oil passage cavity 71 allows oil to flow not only from outside the impeller but also from inside the oil passage cavity 71 of the pump impeller 7. This design not only reduces the weight of the pump impeller 7 and lowers the system load but also improves the cooling effect of the oil on the pump impeller 7, extending the service life of the components.

[0044] The working principle of the oil-immersed semi-submersible heat exchange sewage electric pump in this embodiment is as follows: During operation, the base 4 and volute 21 should be submerged in sewage. Start the motor, and the rotating shaft 12 will drive the pump impeller 22 to rotate, generating power to guide the sewage into the volute 21 through the water inlet 44 of the base 4 and then through the water inlet 211. Finally, the sewage will be discharged from the outlet 212 under the action of the pump impeller 22. At the same time, the rotating shaft 12 will drive the pump oil impeller 7 to generate power to guide the oil from the oil storage chamber 111 into the oil suction chamber 3, and then through the oil outlet channel 1123, oil outlet pipe 6, cooling oil channel 42, filter 51, and water inlet pipe before returning to the oil storage chamber 111. This forms an oil circulation. When the oil circulates into the cooling oil channel 42, it will exchange heat with the sewage in the water inlet channel 41, thereby achieving cooling.

[0045] It should be noted that cooling through oil circulation has the following advantages: First, it can reduce the temperature rise of the motor, thereby optimizing the electric pump throughout its entire life cycle; second, it can enhance the lubrication effect of the bearing 13, thereby extending the service life of the bearing 13; third, it can reduce the contact oil temperature of the mechanical seal structure 113, thereby extending the service life of the mechanical seal structure 113.

[0046] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement this utility model. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. An oil-immersed semi-submersible heat exchange sewage electric pump, comprising a motor assembly (1) and a pump body assembly (2), wherein the motor assembly (1) comprises a housing (11) and a rotating shaft (12), wherein a sealed oil storage chamber (111) is formed inside the housing (11) and a lower end cover (112) is provided at the lower end, the rotating shaft (12) passes through the lower end cover (112) and forms an extended shaft section (121), the rotating shaft (12) and the lower end cover (112) are rotary sealed by a mechanical seal structure (113), the pump body assembly (2) comprises a volute (21) and a pump impeller (22), the pump impeller (22) is fixed on the extended shaft section (121) and placed inside the volute (21), the bottom of the volute (21) is provided with an inlet (211) and the side wall is provided with an outlet (212), characterized in that, Also includes: An oil suction chamber (3) is opened inside the lower end cover (112). The top of the oil suction chamber (3) is connected to the oil storage chamber (111). The oil suction chamber (3) is located above the mechanical seal structure (113). The base (4) is connected below the water inlet (211) of the vortex shell (21) and forms a water inlet channel (41). The base (4) is also provided with a cooling oil channel (42), which surrounds the water inlet channel (41). The oil inlet pipe (5) is connected at its upper end to the top of the oil storage chamber (111) and at its lower end to the cooling oil passage (42). The oil outlet pipe (6) is connected at its upper end to the oil suction chamber (3) and at its lower end to the cooling oil passage (42). The oil pump impeller (7) is fixed on the rotating shaft (12) and placed in the oil suction chamber (3). The oil pump impeller (7) is used to pump the oil in the oil suction chamber (3) into the oil storage chamber (111) after passing through the oil outlet pipe (6), the cooling oil passage (42) and the oil inlet pipe (5) in sequence.

2. The oil-immersed semi-submersible heat exchange sewage pump according to claim 1, characterized in that, The bottom of the base (4) forms a water inlet cavity (43), and a water inlet (44) is provided on one side of the water inlet cavity (43). The top of the base (4) is provided with an annular cavity (45). The inner hole of the annular cavity (45) is located directly below the water inlet (211) and forms the water inlet channel (41). The cooling oil channel (42) is arranged in the annular cavity (45).

3. The oil-immersed semi-submersible heat exchange sewage pump according to claim 2, characterized in that, The cooling oil passage (42) is arranged in a spiral shape.

4. The oil-immersed semi-submersible heat exchange sewage pump according to claim 1, characterized in that, A filter (51) is connected in series at the lower end of the oil inlet pipe (5).

5. The oil-immersed semi-submersible heat exchange sewage pump according to claim 1, characterized in that, The top side wall of the housing (11) is provided with a first oil injection hole (114), and the upper end of the oil inlet pipe (5) is provided with a second oil injection hole (52).

6. The oil-immersed semi-submersible heat exchange sewage pump according to claim 1, characterized in that, The lower end cover (112) includes a mounting cover (1121) and a connecting cover (1122). The mounting cover (1121) is fixed to the lower end of the housing (11) and a bearing (13) is installed between it and the rotating shaft (12). The connecting cover (1122) is connected between the mounting cover (1121) and the volute (21). The mechanical seal structure (113) is installed between the connecting cover (1122) and the rotating shaft (12). The radial outer side of the mounting cover (1121) is sealed to the connecting cover (1122), and the radial inner side of the mounting cover (1121) forms the oil suction chamber (3) between it and the connecting cover (1122). The oil suction chamber (3) is connected to the oil outlet pipe (6) through the oil outlet channel (1123) provided in the mounting cover (1121).

7. The oil-immersed semi-submersible heat exchange sewage pump according to claim 6, characterized in that, The pump impeller (7) is hollow to form an oil passage cavity (71). The top of the oil passage cavity (71) is located directly below the bearing (13), and the bottom of the oil passage cavity (71) is arranged corresponding to the oil outlet channel (1123).

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