Explosion-proof sewage submersible pump

Abstract

The utility model relates to the technical field of submersible sewage pump discloses an explosion -proof submersible sewage pump, it includes the shell with liquid cooling cavity and motor assembly, and the motor assembly includes motor shell, pivot, first bearing unit and second bearing unit, and the motor shell is located in liquid cooling cavity, and the both ends of the inner chamber of motor shell are equipped with first opening and second opening, and the pivot rotation sets up in the inner chamber, the first bearing of first bearing unit is located in one end of motor shell, and is equipped with in the pivot outer, and the first bearing seat is equipped with in the first bearing outer, and is sealed in first opening, and the first bearing seat is formed with first liquid cooling passage in, the second bearing of second bearing unit is located in the other end of motor shell, and is equipped with in the pivot outer, and the second bearing seat is equipped with in the second bearing outer, and is sealed in second opening, and the second bearing seat is formed with second liquid cooling passage in, the utility model can improve the heat dissipation performance of explosion -proof submersible sewage pump to bearing.

Description

Technical Field

[0001] This utility model relates to the field of submersible sewage pump technology, and in particular to an explosion-proof submersible sewage pump. Background Technology

[0002] In related technologies, submersible sewage pumps are mainly composed of a motor assembly and a pump body assembly. The rotating shaft of the motor assembly is driven to the impeller of the pump body assembly, so that the impeller can rotate at high speed under the drive of the rotating shaft, thereby converting the rotational power of the motor into the kinetic energy of the liquid to realize the sewage pumping function of the submersible sewage pump.

[0003] Currently, to ensure the explosion-proof performance of submersible sewage pumps, the joints of the various housing components of the motor assembly are typically equipped with well-sealed explosion-proof mating surfaces to prevent electrical sparks generated inside the motor's sealed cavity from contacting the external environment. However, this design also makes it difficult for the heat generated inside the motor to be quickly transferred to the external environment. This poses a risk that the bearings connected to the motor shaft and the grease within them may fail due to excessive temperature, affecting the normal operation of the explosion-proof submersible sewage pump. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an explosion-proof submersible sewage pump, which aims to improve the heat dissipation performance of the bearing in the explosion-proof submersible sewage pump.

[0005] To achieve the above objectives, this utility model provides an explosion-proof submersible sewage pump, including a housing and a motor assembly, wherein a liquid-cooled cavity is formed within the housing, and the motor assembly includes: The motor housing is disposed in the liquid cooling cavity. The motor housing has an inner cavity, and the motor housing has a first opening and a second opening communicating with the inner cavity at opposite ends in a first direction, respectively. A rotating shaft extends along the first direction and is rotatably disposed within the inner cavity; A first bearing unit, comprising a first bearing and a first bearing housing, wherein the first bearing is located at one end of the motor housing and sleeved on the outside of the rotating shaft, the first bearing housing is sleeved on the outside of the first bearing and sealed at the first opening, and a first liquid cooling channel is formed within the first bearing housing, the first liquid cooling channel being isolated from the inner cavity and communicating with the liquid cooling cavity; and The second bearing unit includes a second bearing and a second bearing housing. The second bearing is located at the other end of the motor housing and is sleeved on the outside of the rotating shaft. The second bearing housing is sleeved on the outside of the second bearing and is sealed in the second opening. A second liquid cooling channel is formed inside the second bearing housing. The second liquid cooling channel is isolated from the inner cavity and is connected to the liquid cooling cavity.

[0006] In one embodiment, the first bearing housing has a first shaft hole for accommodating the first bearing, the first shaft hole extending through the first bearing housing along the first direction, and the first liquid cooling channel includes: The first chamber is arranged circumferentially around the first shaft hole; A first liquid inlet channel, one end of which is connected to one side of the first chamber in a second direction, and the other end of which is connected to the liquid cooling chamber, wherein the second direction is perpendicular to the first direction; and The first liquid outlet channel has one end connected to the side of the first chamber away from the first liquid inlet channel, and the other end connected to the liquid cooling chamber.

[0007] In one embodiment, the first bearing housing is further provided with two first through holes, which are respectively located on opposite sides of the first chamber in the second direction and pass through the first bearing housing in the first direction. The two first through holes are respectively isolated from the first liquid inlet channel and the first liquid outlet channel.

[0008] In one embodiment, one end of the outer casing is provided with a mounting port communicating with the liquid cooling cavity, and the first bearing housing includes: A first main body portion, disposed within the liquid-cooling cavity, with one end of the first main body portion facing the motor housing sealed at the first opening; and The second main body is located on the side of the first main body away from the motor housing, and together with the first main body, it encloses the first liquid cooling channel. The end of the second main body away from the first main body is sealed at the mounting port. The first shaft hole and the two first through holes all penetrate the first main body and the second main body along the first direction.

[0009] In one embodiment, the explosion-proof submersible sewage pump further includes a pump body assembly, the pump body assembly comprising: A pump housing, located at the end of the second main body away from the first main body, has a pump cavity. The pump housing has an inlet hole, an outlet hole, and a first connecting hole on the side facing the first bearing seat, all communicating with the pump cavity. The inlet hole and the outlet hole are respectively connected to two first through holes. An impeller is movably disposed within the pump chamber, and one end of the rotating shaft extends into the pump chamber through the first connecting hole and is drivenly connected to the impeller.

[0010] In one embodiment, the central axis of the impeller extends along the first direction, and a second connecting hole is provided at one end of the impeller near the first bearing seat. The second connecting hole is connected to the rotating shaft. A flow channel is formed inside the impeller, and an inlet communicating with the flow channel is formed at one end of the impeller away from the first bearing seat. An outlet communicating with the flow channel is formed on the periphery of the impeller. The pump casing is also provided with an inlet and an outlet that communicate with the pump chamber. The inlet is located at the end of the pump casing away from the first bearing seat and is arranged opposite to the inlet along the first direction. The outlet is located on the periphery of the pump casing and is arranged opposite to the outlet along the radial direction of the impeller.

[0011] In one embodiment, the pump body assembly further includes: A first surrounding structure is disposed on the cavity wall of the pump chamber and located on the side of the impeller facing the first bearing seat. The first surrounding structure is circumferentially arranged around the second connecting hole and rotatably connected to the impeller to form a connecting cavity on the side of the impeller facing the first bearing seat. The connecting cavity is connected to the liquid cooling cavity through the liquid outlet hole. A balance hole is also provided on the side of the impeller facing the first bearing seat, with its two ends communicating with the connecting cavity and the flow channel, respectively. The second perimeter structure is disposed on the cavity wall of the pump chamber and located on the side of the impeller away from the first bearing seat. The second perimeter structure is arranged around the circumference of the impeller and is rotatably connected to the impeller to form an inlet chamber on the side of the impeller away from the first bearing seat. The inlet chamber is connected to the inlet port and the outlet port respectively. The pump chamber also includes an outlet chamber arranged around the circumference of the impeller. The outlet chamber is connected to the outlet port and the outlet port respectively.

[0012] In one embodiment, the explosion-proof submersible sewage pump further includes: A liquid inlet pipe, one end of which passes through the liquid inlet hole, and the other end extends along the first direction and into the liquid cooling cavity through one of the first through holes, and is located adjacent to the side wall of the liquid cooling cavity near the first bearing seat; and The liquid outlet pipe has one end inserted through the liquid outlet hole and the other end extending along the first direction and into the liquid cooling cavity through another first through hole, and is located on the side wall of the liquid cooling cavity away from the first bearing seat.

[0013] In one embodiment, the second bearing housing is further provided with a second through hole. The second through hole is disposed through the second bearing housing along the first direction and is isolated from the second liquid cooling channel. The second through hole and the liquid outlet hole are disposed opposite to each other in the first direction. The liquid outlet pipe passes through the liquid outlet hole, the first through hole and the second through hole in sequence.

[0014] In one embodiment, the outer peripheral surface of the second bearing housing is spaced apart from the inner wall of the liquid cooling cavity. The second bearing housing has a second shaft hole for accommodating the second bearing. The second shaft hole extends through the second bearing housing along the first direction. The second liquid cooling channel includes: The second chamber is arranged circumferentially around the second shaft hole; A second liquid inlet channel, one end of which is connected to one side of the second chamber in a second direction, and the other end extending away from the second chamber and connected to the liquid cooling chamber; and The second liquid outlet channel has one end connected to the side of the second chamber away from the first liquid inlet channel, and the other end extends in a direction away from the second chamber and connects to the liquid cooling chamber. The second through hole is located on the side of the second chamber facing the second liquid outlet channel and is isolated from the second liquid outlet channel.

[0015] This utility model provides an explosion-proof submersible sewage pump, which has the following advantages compared with the prior art: The explosion-proof submersible sewage pump of this utility model embodiment includes a housing and a motor assembly. A liquid-cooling cavity is formed inside the housing. The motor housing of the motor assembly is disposed within the liquid-cooling cavity. The motor housing has an inner cavity. At opposite ends of the motor housing in a first direction, a first opening and a second opening are respectively provided, communicating with the inner cavity. A first bearing unit and a second bearing unit are respectively provided at the first and second openings. A rotating shaft extends along the first direction and is rotatably disposed within the inner cavity. The first bearing unit includes a first bearing and a first bearing seat. The first bearing is located at one end of the motor housing and is sleeved on the outside of the rotating shaft. The first bearing seat is sleeved on the outside of the first bearing and sealed within the first opening. A first liquid-cooling channel is formed within the first bearing seat. The second bearing unit includes a second bearing and a second bearing seat. The second bearing is located at the other end of the motor housing and is sleeved on the outside of the rotating shaft. The second bearing seat is sleeved on the outside of the second bearing and sealed within the second opening. A second liquid-cooling channel is formed within the second bearing seat. It is understood that by providing a first liquid cooling channel and a second liquid cooling channel in the first bearing housing and the second bearing housing respectively, and by having both the first liquid cooling channel and the second liquid cooling channel communicate with the liquid cooling cavity, the liquid cooling channel and the second liquid cooling channel can be used to achieve the liquid cooling heat dissipation function for the first bearing unit and the second bearing unit. The liquid flow in the first liquid cooling channel and the second liquid cooling channel can remove the heat from the first bearing unit and the second bearing unit in a timely manner, thereby improving the heat dissipation performance of the explosion-proof submersible pump for the first bearing and the second bearing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the explosion-proof submersible sewage pump described in this embodiment of the utility model; Figure 2 This is a utility model Figure 1 A partial structural diagram of the explosion-proof submersible sewage pump described herein; Figure 3 This is a utility model Figure 1 A magnified view of point A in the image; Figure 4 This is a schematic diagram of the liquid flow of the explosion-proof submersible sewage pump described in this embodiment of the utility model; Figure 5 This is another schematic diagram of liquid flow in the explosion-proof submersible sewage pump described in this embodiment of the present invention.

[0017] In the diagram, 100 is an explosion-proof submersible sewage pump; 10 is the outer casing; 11 is the liquid cooling cavity; 12 is the mounting port; 20 is the motor assembly; 21 is the motor housing; 211 is the inner cavity; 2111 is the first opening; 2112 is the second opening; 22 is the rotating shaft; 23 is the first bearing unit; 231 is the first bearing; 232 is the first bearing seat; 2321 is the first main body; 2322 is the second main body; 2323 is the first liquid cooling channel; 2323a is the first chamber; 2323b is the first liquid inlet channel; 2323c is the first liquid outlet channel; 2324 is the first through hole; 2325 is the first shaft hole; 24 is the second bearing unit; 241 is the second bearing; 242 is the second bearing seat; 2421 is the second liquid cooling channel. 2421a, Second chamber; 2421b, Second inlet channel; 2421c, Second outlet channel; 2422, Second through hole; 2423, Second shaft hole; 30, Pump body assembly; 31, Pump casing; 311, Pump chamber; 3111, Connecting chamber; 3111a, First connecting hole; 3111b, Inlet hole; 3111c, Outlet hole; 3112, Inlet chamber; 3112a, Inlet; 3113, Outlet chamber; 3113a, Outlet; 312, First surrounding structure; 313, Second surrounding structure; 32, Impeller; 321, Flow channel; 3211, Inlet; 3212, Outlet; 3213, Second connecting hole; 3214, Balance hole; 40, Inlet pipe; 50, Outlet pipe. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0019] It should be understood that the terms "before" and "after" are used in this utility model to describe various types of information, but these terms should not be limited to them. These terms are only used to distinguish information of the same type from each other. For example, "before" information can also be called "after" information, and "after" information can also be called "before" information, without departing from the scope of this utility model.

[0020] like Figure 1As shown, an explosion-proof submersible sewage pump 100 according to an embodiment of the present invention includes a housing 10 and a motor assembly 20. A liquid-cooled cavity 11 is formed inside the housing 10. The motor assembly 20 includes a motor housing 21, a rotating shaft 22, a first bearing unit 23, and a second bearing unit 24. The motor housing 21 is disposed in the liquid-cooled cavity 11 and has an inner cavity 211. The motor housing 21 has a first opening 2111 and a second opening 2112 communicating with the inner cavity 211 at opposite ends in a first direction, respectively. The rotating shaft 22 extends along the first direction and is rotatably disposed in the inner cavity 211. The first bearing unit 23 includes a first bearing 231 and a first bearing seat 232. The first bearing 231 is located at one end of the motor housing 21 and is sleeved on the rotating shaft 24. Outside the shaft 22, a first bearing housing 232 is fitted over the first bearing 231 and sealed in the first opening 2111. A first liquid cooling channel 2323 is formed inside the first bearing housing 232, which is isolated from the inner cavity 211 and connected to the liquid cooling cavity 11. The second bearing unit 24 includes a second bearing 241 and a second bearing housing 242. The second bearing 241 is located at the other end of the motor housing 21 and fitted over the shaft 22. The second bearing housing 242 is fitted over the second bearing 241 and sealed in the second opening 2112. A second liquid cooling channel 2421 is formed inside the second bearing housing 242, which is isolated from the inner cavity 211 and connected to the liquid cooling cavity 11.

[0021] In some embodiments, the inner cavity 211 of the motor housing 21 is a sealed cavity, and the internal components of the motor assembly 20, such as terminals and motor cables, are sealed inside the inner cavity 211. Optionally, the mating surfaces of the various housing components of the motor assembly 20 can be configured as explosion-proof mating surfaces, such as cylindrical explosion-proof mating surfaces. This configuration can effectively prevent sparks or explosions generated inside the inner cavity 211 from propagating to the outside of the housing.

[0022] Furthermore, the outer casing 10 is fitted over the motor housing 21, and the inner wall of the outer casing 10 is spaced apart from the outer wall of the motor housing 21. The liquid cooling cavity 11 is formed between the inner wall of the outer casing 10 and the outer wall of the motor housing 21. By circumferentially surrounding the motor housing 21 and isolating the liquid cooling cavity 11 from the inner cavity 211 of the motor housing 21, the liquid in the liquid cooling cavity 11 can provide cooling for the explosion-proof submersible sewage pump 100, thereby enabling the explosion-proof submersible sewage pump 100 to be used in dry environments and higher temperature environments.

[0023] It is understood that the explosion-proof submersible sewage pump 100 of this utility model provides a first liquid cooling channel 2323 in the first bearing housing 232 and a second liquid cooling channel 2421 in the second bearing housing 242, and both the first liquid cooling channel 2323 and the second liquid cooling channel 2421 are connected to the liquid cooling cavity 11. This allows the liquid in the first liquid cooling channel 2323 and the second liquid cooling channel 2421 to provide a cooling effect for the first bearing unit 23 and the second bearing unit 24. The liquid flow in the first liquid cooling channel 2323 and the second liquid cooling channel 2421 can promptly remove the heat from the first bearing unit 23 and the second bearing unit 24, thereby realizing the liquid cooling heat dissipation function of the first bearing unit 23 and the second bearing unit 24. This is beneficial to improving the heat dissipation performance of the explosion-proof submersible sewage pump 100 for the first bearing 231 and the second bearing 241.

[0024] Furthermore, the liquid cooling cavity 11 surrounding the motor housing 21 can also provide water seal protection for the motor assembly 20. This arrangement not only improves the protection performance of the motor assembly 20 and reduces the risk of failure of the inner cavity 211, but also provides secondary isolation of sparks generated inside the motor assembly 20 through the liquid cooling cavity 11. This can further improve the explosion-proof performance and explosion-proof stability of the explosion-proof submersible sewage pump 100, so that the explosion-proof submersible sewage pump 100 can adapt to explosion-proof environments with higher requirements.

[0025] like Figure 1 , Figure 3 as well as Figure 4 As shown, in this embodiment of the present invention, the first bearing seat 232 is provided with a first shaft hole 2325 for accommodating the first bearing 231. The first shaft hole 2325 is disposed through the first bearing seat 232 in a first direction. The first liquid cooling channel 2323 includes a first chamber 2323a, a first liquid inlet channel 2323b, and a first liquid outlet channel 2323c. The first chamber 2323a is disposed around the first shaft hole 2325 in a circumferential direction. One end of the first liquid inlet channel 2323b is connected to one side of the first chamber 2323a in a second direction, and the other end is connected to the liquid cooling cavity 11. The second direction is perpendicular to the first direction. One end of the first liquid outlet channel 2323c is connected to the side of the first chamber 2323a away from the first liquid inlet channel 2323b, and the other end is connected to the liquid cooling cavity 11.

[0026] By circumferentially positioning the first chamber 2323a around the first shaft hole 2325, the liquid in the first chamber 2323a can effectively cool the first bearing 231 in the first shaft hole 2325, thereby ensuring the liquid cooling effect of the first bearing unit 23.

[0027] like Figure 5As shown, in this embodiment of the present invention, the first bearing housing 232 is further provided with two first through holes 2324. The two first through holes 2324 are respectively disposed on opposite sides of the first chamber 2323a in the second direction and are disposed through the first bearing housing 232 in the first direction. The two first through holes 2324 are respectively isolated from the first liquid inlet channel 2323b and the first liquid outlet channel 2323c. By providing the first through holes 2324 on the first bearing housing 232, the first through holes 2324 can provide a flow path for the liquid in the liquid cooling chamber 11, so as to avoid the first bearing housing 232 from obstructing the smooth flow of liquid in the liquid cooling chamber 11.

[0028] like Figure 1 , Figure 3 As shown, in this embodiment of the utility model, one end of the outer shell 10 is provided with an installation port 12 that communicates with the liquid cooling cavity 11. The first bearing seat 232 includes a first main body 2321 and a second main body 2322. The first main body 2321 is disposed in the liquid cooling cavity 11, and the end of the first main body 2321 facing the motor housing 21 is sealed in the first opening 2111. The second main body 2322 is disposed on the side of the first main body 2321 away from the motor housing 21, and together with the first main body 2321, it forms a first liquid cooling channel 2323. The end of the second main body 2322 away from the first main body 2321 is sealed in the installation port 12. The first shaft hole 2325 and the two first through holes 2324 all penetrate the first main body 2321 and the second main body 2322 along the first direction. With this configuration, the first bearing housing 232 can be mated and engaged with the first main body 2321 and the second main body 2322 respectively with the motor housing 21 and the outer casing 10, thereby ensuring the stability of the fit between the first bearing housing 232, the outer casing 10 and the motor housing 21.

[0029] like Figure 1 and Figure 4 As shown, the explosion-proof submersible sewage pump 100 of this utility model embodiment also includes a pump body assembly 30. The pump body assembly 30 includes a pump casing 31 and an impeller 32. The pump casing 31 is located at the end of the second main body 2322 away from the first main body 2321. The pump casing 31 has a pump cavity 311. The side of the pump casing 31 facing the first bearing seat 232 is provided with an inlet hole 3111b, an outlet hole 3111c and a first connecting hole 3111a that communicate with the pump cavity 311. The inlet hole 3111b and the outlet hole 3111c are respectively connected to two first through holes 2324. The impeller 32 is movably disposed in the pump cavity 311. One end of the rotating shaft 22 passes through the first connecting hole 3111a and extends into the pump cavity 311, and is drivenly connected to the impeller 32.

[0030] When the impeller 32 in the pump chamber 311 rotates around the first direction under the drive of the rotating shaft 22 of the motor assembly 20, it can guide part of the liquid in the pump chamber 311 to flow into and fill the liquid cooling chamber 11, and drive the liquid to circulate between the pump chamber 311 and the liquid cooling chamber 11, thereby realizing the self-circulating cooling and heat dissipation of the explosion-proof submersible sewage pump 100.

[0031] like Figure 1 and Figure 4 As shown, in this embodiment of the present invention, the central axis of the impeller 32 extends along a first direction. A second connecting hole 3213 is provided at one end of the impeller 32 near the first bearing seat 232, and the second connecting hole 3213 is connected to the rotating shaft 22. A flow channel 321 is formed inside the impeller 32. An inlet 3211 communicating with the flow channel 321 is formed at the end of the impeller 32 away from the first bearing seat 232, and an outlet 3212 communicating with the flow channel 321 is formed on the periphery of the impeller 32. The pump casing 31 is also provided with an inlet 3112a and an outlet 3113a communicating with the pump chamber 311. The inlet 3112a is located at the end of the pump casing 31 away from the first bearing seat 232 and is positioned opposite to the inlet 3211 along the first direction. The outlet 3113a is located on the periphery of the pump casing 31 and is positioned opposite to the outlet 3212 along the radial direction of the impeller 32. This arrangement allows for a smooth liquid flow path within the pump assembly 30. When the impeller 32 is running, the liquid in the external environment can first enter the inlet chamber 3112 through the inlet 3112a of the pump body assembly 30, and then enter the internal flow channel 321 of the impeller 32 through the inlet 3211 of the impeller 32. The liquid in the internal flow channel 321 of the impeller 32 can flow from the outlet 3212 of the impeller 32 in the circumferential direction to the outlet 3113a of the pump casing 31 under the action of centrifugal force, and then leave the pump chamber 311 through the outlet 3113a.

[0032] Furthermore, such as Figure 1 and Figure 4 as well as Figure 5As shown, the pump body assembly 30 of this embodiment further includes a first surrounding structure 312 and a second surrounding structure 313. The first surrounding structure 312 is disposed on the cavity wall of the pump chamber 311 and located on the side of the impeller 32 facing the first bearing seat 232. The first surrounding structure 312 is circumferentially arranged around the second connecting hole 3213 and is rotatably connected to the impeller 32 to form a connecting cavity 3111 on the side of the impeller 32 facing the first bearing seat 232. The connecting cavity 3111 is connected to the liquid cooling cavity 11 through the liquid outlet hole 3111c. A balance hole 3214 is also provided on the side of the impeller 32 facing the first bearing seat 232. The two ends of the pump cavity 3111 and the flow channel 321 are respectively connected; the second surrounding structure 313 is provided on the cavity wall of the pump cavity 311 and is located on the side of the impeller 32 away from the first bearing seat 232. The second surrounding structure 313 is arranged around the impeller 32 in a circumferential manner and is rotatably connected to the impeller 32 to form an inlet cavity 3112 on the side of the impeller 32 away from the first bearing seat 232. The inlet cavity 3112 is connected to the inlet port 3112a and the inlet 3211 respectively. The pump cavity 311 also includes an outlet cavity 3113 arranged around the impeller 32 in a circumferential manner. The outlet cavity 3113 is connected to the outlet 3212 and the outlet port 3113a respectively.

[0033] Understandably, during the operation of the explosion-proof submersible sewage pump 100, the impeller 32 can rotate around the first direction under the drive of the shaft 22 of the motor assembly 20, guiding the liquid from the inlet 3211 of the impeller 32 into the flow channel 321. Then, under the action of centrifugal force, the liquid is pressurized and thrown out from the outlet 3212 of the impeller 32 to the periphery of the impeller 32. This creates a high-pressure zone in the annular area around the impeller 32 and a low-pressure zone in the connecting cavity 3111 between the impeller 32 and the first bearing housing 232. Therefore, during the operation of the explosion-proof submersible sewage pump 100, the impeller 32 can, by utilizing the pressure difference generated between the outlet cavity 3113 and the connecting cavity 3111, guide the high-pressure liquid in the outlet cavity 3113 to flow through the liquid-cooling cavity 11 to the connecting cavity 3111, thereby achieving self-circulation of the liquid between the pump cavity 311 and the liquid-cooling cavity 11, and thus realizing the liquid-cooling function of the explosion-proof submersible sewage pump 100 for the motor assembly 20.

[0034] like Figure 1 , Figure 2 As shown, the explosion-proof submersible sewage pump 100 of this utility model embodiment also includes an inlet pipe 40 and an outlet pipe 50. One end of the inlet pipe 40 passes through the inlet hole 3111b, and the other end extends along the first direction and enters the liquid cooling cavity 11 through one of the first through holes 2324, and is adjacent to the side wall of the liquid cooling cavity 11 near the first bearing seat 232. One end of the outlet pipe 50 passes through the outlet hole 3111c, and the other end extends along the first direction and enters the liquid cooling cavity 11 through another first through hole 2324, and is adjacent to the side wall of the liquid cooling cavity 11 away from the first bearing seat 232.

[0035] Specifically, the first direction can be set as an up-down direction. The length of the inlet pipe 40 in the first direction is less than the length of the outlet pipe 50 in the first direction. The outlet end of the inlet pipe 40 is located near the side wall of the first bearing housing 232, while the inlet end of the outlet pipe 50 is located near the side wall of the liquid cooling cavity 11 away from the first bearing housing 232. In this way, the liquid flowing into the liquid cooling cavity 11 through the inlet pipe 40 can gradually fill the liquid cooling cavity 11 from the first bearing housing 232 to the end cap. After the liquid cooling cavity 11 is basically filled, it flows back to the connecting cavity 3111 of the pump cavity 311 through the outlet pipe 50, thereby forming a smooth liquid flow path in the liquid cooling cavity 11.

[0036] like Figure 5 As shown, the second bearing housing 242 of this embodiment of the present invention is further provided with a second through hole 2422. The second through hole 2422 is disposed through the second bearing housing 242 in a first direction and is isolated from the second liquid cooling channel 2421. The second through hole 2422 is disposed opposite to the liquid outlet hole 3111c in the first direction. The liquid outlet pipe 50 is sequentially disposed through the liquid outlet hole 3111c, the first through hole 2324 and the second through hole 2422. The second through hole 2422 can limit the liquid outlet pipe 50, thereby effectively reducing the risk of the liquid outlet pipe 50 being misaligned in the liquid cooling cavity 11. By having the liquid outlet pipe 50 sequentially disposed through the liquid outlet hole 3111c, the first through hole 2324 and the second through hole 2422, and by having the liquid outlet hole 3111c, the first through hole 2324 and the second through hole 2422 work together to limit the liquid outlet pipe 50, the installation stability of the liquid outlet pipe 50 is improved.

[0037] like Figure 1 , Figure 2 As shown, in this embodiment of the present invention, the outer peripheral surface of the second bearing seat 242 is spaced apart from the inner wall of the liquid cooling cavity 11. The second bearing seat 242 is provided with a second shaft hole 2423 for accommodating the second bearing 241. The second shaft hole 2423 is disposed through the second bearing seat 242 in a first direction. The second liquid cooling channel 2421 includes a second chamber 2421a, a second liquid inlet channel 2421b, and a second liquid outlet channel 2421c. The second chamber 2421a is disposed circumferentially around the second shaft hole 2423. One end of the second liquid inlet channel 2421b... The second liquid outlet channel 2421c is connected to one side of the second chamber 2421a in the second direction, and the other end extends in the direction away from the second chamber 2421a and is connected to the liquid cooling chamber 11. One end of the second liquid outlet channel 2421c is connected to the side of the second chamber 2421a away from the first liquid inlet channel 2323b, and the other end extends in the direction away from the second chamber 2421a and is connected to the liquid cooling chamber 11. The second through hole 2422 is located on the side of the second chamber 2421a facing the second liquid outlet channel 2421c and is isolated from the second liquid outlet channel 2421c.

[0038] By circumferentially positioning the second chamber 2421a around the second shaft hole 2423, the liquid within the second chamber 2421a can effectively cool the second bearing 241 within the second shaft hole 2423, thereby ensuring the liquid cooling performance of the second bearing unit 24. Furthermore, by providing a second through hole 2422 on the second bearing seat 242, a flow path can be provided for the liquid within the liquid cooling chamber 11, preventing the second bearing seat 242 from obstructing the smooth flow of liquid within the liquid cooling chamber 11.

[0039] like Figure 5 As shown, the working process of this utility model is as follows: During the operation of the explosion-proof submersible sewage pump 100, liquid from the external environment can first enter the inlet chamber 3112 through the inlet 3112a of the pump body assembly 30; then, the liquid in the inlet chamber 3112 can enter the internal flow channel 321 of the impeller 32 through the axial inlet 3211, and then enter the outlet chamber 3113 through the circumferential outlet 3212 of the impeller 32; some of the liquid in the outlet chamber 3113 can pass through the pump body assembly 30 The liquid exits the pump chamber 311 through the outlet 3113a, while the other liquid can enter and fill the liquid cooling chamber 11 through the inlet pipe 40 at the inlet hole 3111b on the first bearing seat 232. After filling the liquid cooling chamber 11, the liquid can flow back to the connecting chamber 3111 through the outlet pipe 50 at the outlet hole 3111c, and then return to the internal flow channel 321 of the impeller 32 through the balance hole 3214 on the impeller 32, so as to realize the circulation of liquid between the pump chamber 311 and the liquid cooling chamber 11.

[0040] Specifically, such as Figure 4As shown, when the liquid enters the liquid cooling chamber 11 through the inlet pipe 40, it first fills the gap between the first bearing seat 232 at the bottom of the liquid cooling chamber 11 and the outer casing 10, and then sequentially enters the first inlet channel 2323b, the first chamber 2323a, and the first outlet channel 2323c within the first bearing seat 232, so that the liquid can fill the first liquid cooling channel 2323 of the first bearing seat 232 to cool the first bearing unit 23; then, as the liquid gradually fills the liquid cooling chamber 11, the liquid level reaches the location of the second bearing seat 242, so that the liquid can sequentially enter the second bearing seat 242. The second liquid inlet channel 2421b, the second chamber 2421a, and the second liquid outlet channel 2421c in the bearing housing 242 allow liquid to fill the second liquid cooling channel 2421 of the second bearing housing 242 to cool the second bearing unit 24. Finally, after the liquid fills the liquid cooling chamber 11, the liquid can flow back to the connecting chamber 3111 through the liquid outlet pipe 50 at the liquid outlet hole 3111c. Thus, while the explosion-proof submersible pump 100 is cooled and dissipated by the liquid in the liquid cooling chamber 11, the first bearing unit 23 and the second bearing unit 24 are also cooled and dissipated by liquid.

[0041] In summary, this utility model embodiment provides an explosion-proof submersible sewage pump 100, which can drive the impeller 32 to rotate through the rotating shaft 22 of the motor assembly 20. Then, through the pressure difference generated by the impeller 32 during operation, the liquid is guided to flow from the inlet 3112a of the pump chamber 311 to the outlet 3113a, and a portion of the liquid in the pump chamber 311 can circulate between the pump chamber 311 and the liquid cooling chamber 11. Thus, during the operation of the explosion-proof submersible sewage pump 100, the liquid in the liquid cooling chamber 11 can provide water seal protection to the periphery of the inner cavity 211, thereby improving the explosion-proof performance and explosion-proof stability of the explosion-proof submersible sewage pump 100.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An explosion-proof submersible sewage pump, characterized in that, The assembly includes a housing and a motor assembly, wherein a liquid-cooled cavity is formed within the housing, and the motor assembly includes: The motor housing is disposed in the liquid cooling cavity. The motor housing has an inner cavity, and the motor housing has a first opening and a second opening communicating with the inner cavity at opposite ends in a first direction, respectively. A rotating shaft extends along the first direction and is rotatably disposed within the inner cavity; A first bearing unit, comprising a first bearing and a first bearing housing, wherein the first bearing is located at one end of the motor housing and sleeved on the outside of the rotating shaft, the first bearing housing is sleeved on the outside of the first bearing and sealed at the first opening, and a first liquid cooling channel is formed within the first bearing housing, the first liquid cooling channel being isolated from the inner cavity and communicating with the liquid cooling cavity; and The second bearing unit includes a second bearing and a second bearing housing. The second bearing is located at the other end of the motor housing and is sleeved on the outside of the rotating shaft. The second bearing housing is sleeved on the outside of the second bearing and is sealed in the second opening. A second liquid cooling channel is formed inside the second bearing housing. The second liquid cooling channel is isolated from the inner cavity and is connected to the liquid cooling cavity.

2. The explosion-proof submersible sewage pump according to claim 1, characterized in that, The first bearing housing has a first shaft hole for accommodating the first bearing, the first shaft hole extending through the first bearing housing along the first direction, and the first liquid cooling channel includes: The first chamber is arranged circumferentially around the first shaft hole; A first liquid inlet channel, one end of which is connected to one side of the first chamber in a second direction, and the other end of which is connected to the liquid cooling chamber, wherein the second direction is perpendicular to the first direction; and The first liquid outlet channel has one end connected to the side of the first chamber away from the first liquid inlet channel, and the other end connected to the liquid cooling chamber.

3. The explosion-proof submersible sewage pump according to claim 2, characterized in that, The first bearing housing is also provided with two first through holes. The two first through holes are respectively located on opposite sides of the first chamber in the second direction and are arranged to pass through the first bearing housing in the first direction. The two first through holes are respectively isolated from the first liquid inlet channel and the first liquid outlet channel.

4. The explosion-proof submersible sewage pump according to claim 3, characterized in that, One end of the outer casing is provided with an installation port communicating with the liquid cooling cavity, and the first bearing housing includes: A first main body portion, disposed within the liquid-cooling cavity, with one end of the first main body portion facing the motor housing sealed at the first opening; and The second main body is located on the side of the first main body away from the motor housing, and together with the first main body, it encloses the first liquid cooling channel. The end of the second main body away from the first main body is sealed at the mounting port. The first shaft hole and the two first through holes all penetrate the first main body and the second main body along the first direction.

5. The explosion-proof submersible sewage pump according to claim 4, characterized in that, The explosion-proof submersible sewage pump also includes a pump body assembly, which comprises: A pump housing, located at the end of the second main body away from the first main body, has a pump cavity. The pump housing has an inlet hole, an outlet hole, and a first connecting hole on the side facing the first bearing seat, all communicating with the pump cavity. The inlet hole and the outlet hole are respectively connected to two first through holes. An impeller is movably disposed within the pump chamber. One end of the rotating shaft extends into the pump chamber through the first connecting hole and is drivenly connected to the impeller.

6. The explosion-proof submersible sewage pump according to claim 5, characterized in that, The central axis of the impeller extends along the first direction. The end of the impeller near the first bearing seat is provided with a second connecting hole, which is connected to the rotating shaft. A flow channel is formed inside the impeller. An inlet communicating with the flow channel is formed at the end of the impeller away from the first bearing seat. An outlet communicating with the flow channel is formed on the periphery of the impeller. The pump casing is also provided with an inlet and an outlet that communicate with the pump chamber. The inlet is located at the end of the pump casing away from the first bearing seat and is arranged opposite to the inlet along the first direction. The outlet is located on the periphery of the pump casing and is arranged opposite to the outlet along the radial direction of the impeller.

7. The explosion-proof submersible sewage pump according to claim 6, characterized in that, The pump assembly also includes: A first surrounding structure is disposed on the cavity wall of the pump chamber and located on the side of the impeller facing the first bearing seat. The first surrounding structure is circumferentially arranged around the second connecting hole and rotatably connected to the impeller to form a connecting cavity on the side of the impeller facing the first bearing seat. The connecting cavity is connected to the liquid cooling cavity through the liquid outlet hole. A balance hole is also provided on the side of the impeller facing the first bearing seat, with its two ends communicating with the connecting cavity and the flow channel, respectively. The second perimeter structure is disposed on the cavity wall of the pump chamber and located on the side of the impeller away from the first bearing seat. The second perimeter structure is arranged around the circumference of the impeller and is rotatably connected to the impeller to form an inlet chamber on the side of the impeller away from the first bearing seat. The inlet chamber is connected to the inlet port and the outlet port respectively. The pump chamber also includes an outlet chamber arranged around the circumference of the impeller. The outlet chamber is connected to the outlet port and the outlet port respectively.

8. The explosion-proof submersible sewage pump according to claim 5, characterized in that, The explosion-proof submersible sewage pump also includes: A liquid inlet pipe, one end of which passes through the liquid inlet hole, and the other end extends along the first direction and into the liquid cooling cavity through one of the first through holes, and is located adjacent to the side wall of the liquid cooling cavity near the first bearing seat; and The liquid outlet pipe has one end inserted through the liquid outlet hole and the other end extending along the first direction and into the liquid cooling cavity through another first through hole, and is located on the side wall of the liquid cooling cavity away from the first bearing seat.

9. The explosion-proof submersible sewage pump according to claim 8, characterized in that, The second bearing housing is also provided with a second through hole. The second through hole is disposed through the second bearing housing along the first direction and is isolated from the second liquid cooling channel. The second through hole and the liquid outlet hole are disposed opposite to each other in the first direction. The liquid outlet pipe passes through the liquid outlet hole, the first through hole and the second through hole in sequence.

10. The explosion-proof submersible sewage pump according to claim 9, characterized in that, The outer peripheral surface of the second bearing housing is spaced apart from the inner wall of the liquid cooling cavity. The second bearing housing has a second shaft hole for accommodating the second bearing. The second shaft hole extends through the second bearing housing along the first direction. The second liquid cooling channel includes: The second chamber is arranged circumferentially around the second shaft hole; A second liquid inlet channel, one end of which is connected to one side of the second chamber in a second direction, and the other end extending away from the second chamber and connected to the liquid cooling chamber; and The second liquid outlet channel has one end connected to the side of the second chamber away from the first liquid inlet channel, and the other end extends in a direction away from the second chamber and connects to the liquid cooling chamber. The second through hole is located on the side of the second chamber facing the second liquid outlet channel and is isolated from the second liquid outlet channel.

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