Sewage pump with sealing structure

Abstract

This invention provides a sewage pump with a sealed structure, including a pump casing and a drive shaft. A water separation baffle is fixed inside the pump casing, creating an upper chamber within the pump casing. An upper cover seal and an upper bearing are located between the drive shaft and the upper cover of the pump casing, while a lower bearing is located between the drive shaft and the water separation baffle. The upper chamber is filled with lubricating oil. The water separation baffle extends downwards with increasing angle, creating a water separation groove at the bottom of the upper chamber that is lower than the lower bearing. When the upper cover seal is damaged, some water enters the upper chamber. Because water is denser than lubricating oil, the water sinks into the water separation groove below the lower bearing. The upper and lower bearings remain encased in lubricating oil, preventing water from entering and damaging them, thus extending the service life of the sewage pump. The lubricating oil in the upper chamber heats up and expands with the high-speed rotation of the drive shaft, generating positive pressure and preventing external water from entering.

Description

Technical Field

[0001] This invention relates to the field of sewage pump technology, and in particular to a sewage pump with a sealed structure. Background Technology

[0002] Shipyard rust removal equipment is a specialized device used to remove rust and other deposits from the surfaces of ships (including hulls, decks, cabins, pipes, and other metal components). Its core function is to provide standard-compliant metal surfaces for ship maintenance, repair, and construction. During the operation of rust removal equipment, wastewater containing rust, metal shavings, oil, and other impurities is generated, requiring specialized wastewater pumps for discharge and treatment.

[0003] Because sewage contains many impurities and operates in harsh environments, most sewage pumps are designed based on the centrifugal pump principle, generally operating at low pressure but with high flow rates. For example... Figure 1 As shown, the existing sewage pump includes a pump casing 10, a drive shaft 40 rotatably supported in the pump casing 10 via an upper bearing 20 and a lower bearing 30, and an impeller 50 fixed on the drive shaft 40. The pump casing 10 has a flow chamber 101 accommodating the impeller 50, and the pump casing 10 has an inlet 102 and an outlet 103 both communicating with the flow chamber 101. Furthermore, to ensure sealing, the pump casing 10 has upper cover seals 60 at both ends of the upper bearing 20 and a lower cover seal 70 at the lower end of the lower bearing 30. When the sewage pump is mounted on a vacuum sewage tank, a one-way valve is usually connected to the outlet 103 of the sewage pump. When the sewage pump discharges water, the one-way valve opens, the drive shaft 40 drives the impeller 50 to rotate, and the sewage enters the flow chamber 101 through the inlet 102 and is then discharged from the outlet 103. The one-way valve ensures smooth drainage of the sewage pump and prevents sewage backflow. When the sewage pump stops draining, the check valve closes. The check valve prevents air from entering the vacuum sewage tank, which would cause the vacuum level of the vacuum sewage tank to drop significantly and prevent it from working properly.

[0004] However, existing sewage pumps have the following drawbacks.

[0005] 1. If the lower cover seal 70 is damaged, sewage in the flow chamber 101 of the pump casing 10 can easily enter the lower bearing 30, causing damage to the lower bearing 30 and consequently damaging the sewage pump.

[0006] 2. If the upper cover seal 60 is damaged, water can easily enter through the upper cover seal 60, causing damage to the upper bearing 20 and the lower bearing 30, which in turn leads to damage to the sewage pump.

[0007] 3. The upper bearing 20 and the lower bearing 30 are not lubricated for a long time during operation, which can easily lead to damage and consequently damage to the sewage pump.

[0008] 4. When a sewage pump is installed in a vacuum sewage tank, a connecting port 104 is usually provided on the side wall of the pump casing 10 to balance the pressure inside the vacuum sewage tank and the pump blade area (i.e., the flow chamber 101). When the liquid level is higher than the pump casing 10, it ensures that there is always liquid in the blade area, preventing the sewage pump from malfunctioning. However, after providing the connecting port 104 on the side wall of the pump casing 10, sewage and silt can easily enter the transmission chamber 105 inside the pump casing 10 through the connecting port 104, causing damage to the upper bearing 20 and the lower bearing 30. Furthermore, impurities in the rust removal sewage can clog the inlet 102, thus affecting the water output. Summary of the Invention

[0009] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a sewage pump with a sealed structure that can prevent the upper and lower bearings from being damaged by water ingress even when the upper cover seal is damaged.

[0010] To achieve the above objectives, the present invention provides a sewage pump with a sealed structure, including a pump casing and a drive shaft rotatably installed in the pump casing. A water stain separation baffle is fixedly provided inside the pump casing, and the water stain separation baffle makes the inner cavity of the pump casing have an upper chamber. The pump casing has an upper cover at the top of the upper chamber, and the bottom of the upper chamber is the water stain separation baffle.

[0011] The drive shaft passes through the upper cover, the upper chamber, and the water stain separation partition. An upper cover seal and an upper bearing installed below the upper cover seal are provided between the drive shaft and the upper cover. A lower bearing is provided between the drive shaft and the water stain separation partition. The upper chamber is filled with lubricating oil.

[0012] The water stain separation baffle extends at an angle that is lower as it moves away from the lower bearing, so that the bottom of the upper chamber forms a water stain separation groove that is lower than the lower bearing.

[0013] Furthermore, the pump casing and the water stain separation baffle are integrally formed; the water stain separation baffle includes a conical portion integrally extended from the inner wall of the pump casing, and a mounting block portion integrally formed at the inner end of the conical portion, wherein the mounting block portion is provided with a first mounting groove for accommodating the lower bearing.

[0014] Furthermore, the inner cavity of the pump casing also has a lower chamber that is not connected to the upper chamber. The upper chamber and the lower chamber are separated by a water stain separation baffle. The top of the lower chamber is a water stain separation baffle. The pump casing has a lower cover at the bottom of the lower chamber.

[0015] The drive shaft also passes through the lower chamber and the lower cover, and a lower cover seal is provided between the drive shaft and the lower cover. The lower chamber is filled with lubricating oil.

[0016] The lower chamber is also equipped with a mechanical seal, which is sleeved on the drive shaft. The sealing surfaces at the upper and lower ends of the mechanical seal are respectively in contact with the water stain separation partition and the lower cover.

[0017] Furthermore, both the upper cover seal and the lower cover seal are oil seals, and both the upper cover seal and the lower cover seal are provided with two seals, one at the top and one at the bottom.

[0018] Furthermore, the pump casing is also provided with a flow chamber, which is divided into independent chambers. The bottom of the pump casing is provided with an inlet communicating with the flow chamber, and one side of the pump casing is provided with an outlet communicating with the flow chamber.

[0019] The drive shaft passes through the flow cavity, and the flow cavity is provided with an impeller fixed to the drive shaft.

[0020] Furthermore, the pump casing is provided with a water outlet pipe section connecting the flow chamber and the water outlet, and the water outlet pipe section is L-shaped and extends upward.

[0021] When the sewage pump is installed horizontally in the vacuum sewage tank, the inlet is higher than the outlet, and a one-way valve is installed at the outlet of the outlet pipe section.

[0022] Furthermore, the pump casing is provided with a water outlet pipe section connecting the flow chamber and the water outlet, and the water outlet pipe section is L-shaped and extends upward.

[0023] When the sewage pump is installed vertically in the vacuum sewage tank, the sewage pump also includes a connecting pipe installed at the outlet and a one-way valve installed on the connecting pipe. The connecting pipe is fixed to the outlet pipe section and has an internal and external through-port on the connecting pipe. The through-port is distributed between the outlet and the one-way valve and is higher than the flow chamber.

[0024] Furthermore, a threaded connector is fixedly provided at the bottom end of the connecting pipe, the threaded connector is threadedly connected to the water outlet pipe section, and a rubber sealing ring is provided between the threaded connector and the water outlet pipe section to fill the gap between them.

[0025] As described above, the sewage pump with a sealed structure of the present invention has the following beneficial effects:

[0026] 1. When the top cover seal is intact, it provides a good seal and prevents external dust and water stains from entering the upper chamber.

[0027] 2. The upper and lower bearings rotatably support the drive shaft in the pump casing. The upper and lower bearings are located at the upper and lower ends of the upper chamber, respectively. The upper chamber is filled with lubricating oil, which lubricates the upper and lower bearings on the drive shaft, extending their service life.

[0028] 3. When the upper cover seal is damaged, some moisture will flow into the upper chamber from the connection between the upper cover and the drive shaft. Since water is denser than lubricating oil, the moisture will sink and settle along the water separation baffle into the water separation tank below the lower bearing. The upper and lower bearings will remain encased in lubricating oil, effectively preventing moisture from entering and damaging them, thus extending the service life of the sewage pump. At the same time, the lubricating oil in the upper chamber will heat up and expand due to the high-speed rotation of the drive shaft, generating positive pressure that tightens the seal between the drive shaft and the upper cover, preventing external water from entering. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a sewage pump in the prior art; the diagram is a cross-sectional view.

[0030] Figure 2 This is a schematic diagram of the structure of a sewage pump with a sealed structure according to Embodiment 1 of this application.

[0031] Figure 3 for Figure 2 A sectional view.

[0032] Figure 4 This is a schematic diagram of the second embodiment of the sewage pump with a sealed structure according to this application.

[0033] Figure 5 for Figure 4 Top view.

[0034] Figure 6 and Figure 7 This is a schematic diagram of the shearing fit structure between the cutter head and the cutting wheel in the sewage pump of this application at different times.

[0035] Figure 8 This is a schematic diagram of Embodiment 2 of the shearing fit structure between the cutter head and the cutting wheel in the sewage pump of this application.

[0036] Figure 9 This is a schematic diagram of Embodiment 3 of the shearing fit structure between the cutter head and the cutting wheel in the sewage pump of this application.

[0037] Figure 10 This is a schematic diagram of the sewage pump installed vertically according to this application.

[0038] Figure 11 This is a schematic diagram of the sewage pump in this application when it is installed horizontally.

[0039] Component labeling: Pump housing 10, Flow chamber 101, Inlet 102, Outlet 103, Upper cover 104, Lower cover 105, Outlet pipe section 106, Upper bearing 20, Lower bearing 30, Drive shaft 40, Impeller 50, Upper cover seal 60, Lower cover seal 70, Water stain separation baffle 80, Conical section 81, Mounting block section 82, First mounting groove 83, Upper chamber 91, Lower chamber 92, Water stain separation groove 93, Mechanical seal 110, Cutter disc 120, Cutting wheel 130, Cutter groove 141, Blade 142, Connecting pipe 150, Connecting port 151, Threaded connector 160, Vacuum sewage tank 170, Upper housing 180, First oil inlet 181, Second oil inlet 182, Lower housing 190. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0041] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0042] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0044] This application provides a sewage pump with a sealed structure for use in ship rust removal operations.

[0045] like Figure 2 and Figure 3 As shown, the sewage pump with a sealed structure involved in this application includes a pump casing 10, a drive shaft 40 rotatably mounted in the pump casing 10, a pump drive source connected to the drive shaft 40, an impeller 50 fixed to the outer periphery of the drive shaft 40, and a water stain separation baffle 80 fixed inside the pump casing 10. The pump casing 10 has an inner cavity and a flow cavity 101 distributed below the inner cavity and not communicating with it. The impeller 50 is disposed in the flow cavity 101. The bottom of the pump casing 10 has an inlet 102 communicating with the flow cavity 101, and one side of the pump casing 10 has an outlet 103 communicating with the flow cavity 101. The pump drive source can be a motor, preferably a stepper motor or a servo motor, and is fixed outside the pump casing 10. In particular, the water stain separation baffle 80 gives the pump housing 10 an upper chamber 91. The pump housing 10 has an upper cover 104 at the top of the upper chamber 91, and the water stain separation baffle 80 at the bottom of the upper chamber 91. Based on this, the pump housing 10 can have a chamber only above the water stain separation baffle 80, or it can have chambers both above and below the water stain separation baffle 80. In this embodiment, the water stain separation baffle 80 divides the inner cavity of the pump housing 10 into an upper chamber 91 and a lower chamber 92 that are not connected to each other. The pump housing 10 has a lower cover 105 at the bottom of the lower chamber 92, and the water stain separation baffle 80 is at the top of the lower chamber 92. The flow chamber 101 is located below the lower chamber 92 and is not connected to either the upper chamber 91 or the lower chamber 92; that is, the flow chamber 101 is an independent chamber. A drive shaft 40 passes through an upper cover 104, an upper chamber 91, a water stain separation partition 80, a lower chamber 92, a lower cover 105, and a flow cavity 101. An upper cover seal 60 and an upper bearing 20 mounted below the upper cover seal 60 are provided between the drive shaft 40 and the upper cover 104, with the upper bearing 20 located at the top of the upper chamber 91. A lower bearing 30 is provided between the drive shaft 40 and the water stain separation partition 80, with the lower bearing 30 located at the bottom of the upper chamber 91 and the top of the lower chamber 92. A lower cover seal 70 is provided between the drive shaft 40 and the lower cover 105. Both the upper chamber 91 and the lower chamber 92 are filled with lubricating oil. At least the top surface of the water stain separation partition 80 extends downwards at an angle, so that a water stain separation groove 93 lower than the lower bearing 30 is formed at the bottom of the upper chamber 91.

[0046] The sewage pump is installed in the vacuum sewage tank 170. During the process of removing rust and other attachments from the surface of various metal components such as hulls, decks, cabins, and pipes by the rust removal equipment, sewage containing impurities such as rust, metal scraps, and oil is generated. The sewage is transported through the pipeline to the inlet 102 of the sewage pump and enters the flow chamber 101. Under the action of the impeller 50 driven by the drive shaft 40, the sewage in the flow chamber 101 is transported to the outlet 103 to realize the discharge of sewage.

[0047] When the upper cover seal 60 and the lower cover seal 70 are undamaged, the upper cover seal 60 prevents external dust and water stains from entering the upper chamber 91, and the lower cover seal 70 prevents mud and sand from entering the lower transmission chamber. Both the upper cover seal 60 and the lower cover seal provide good sealing, preventing water from entering the upper bearing 20 and the lower bearing 30. The upper bearing 20 and the lower bearing 30 operate normally, allowing the transmission shaft 40 to be rotatably supported in the pump casing 10. At the same time, the upper chamber 91 is filled with lubricating oil. The upper bearing 20 and the lower bearing 30 are respectively located at the upper and lower ends of the upper chamber 91. The lubricating oil in the upper chamber 91 provides a certain degree of lubrication to the upper bearing 20 and the lower bearing 30 on the transmission shaft 40, extending the service life of the upper bearing 20 and the lower bearing 30.

[0048] When the upper cover seal 60 is damaged, some water and some moisture from the parts before the sewage pump was installed will flow into the upper chamber 91 from the connection between the upper cover 104 and the drive shaft 40. Since the density of water is greater than that of lubricating oil, the water will sink and sink along the water stain separation baffle 80 into the water stain separation tank 93 below the lower bearing 30. The upper bearing 20 and the lower bearing 30 will still be covered by lubricating oil, effectively preventing water from entering the upper bearing 20 and the lower bearing 30 and damaging them, thus extending the service life of the sewage pump. When the lower cover seal 70 is damaged, some sewage will enter the lower chamber 92. However, the lower bearing 30 is located at the top of the lower chamber 92. Even if some sewage enters the lower chamber 92, it will not flow to the lower bearing 30 at the top of the lower chamber 92, thus preventing water from entering the lower bearing 30 and damaging it, and extending the service life of the sewage pump. At the same time, the lubricating oil in the upper chamber 91 and the lower chamber 92 heats up and expands as the drive shaft 40 rotates at high speed, thereby generating positive pressure, which presses the sealing structure between the drive shaft 40 and the upper cover 104 and the lower cover 105 to prevent external water from entering.

[0049] Preferably, such as Figure 3As shown, both the upper cover seal 60 and the lower cover seal 70 are oil seals. Both seals have two layers, one of which is a skeleton oil seal. At the sealing structure between the upper cover 104 and the drive shaft 40: the skeleton oil seal prevents external dust and water from entering the upper chamber 91, and the oil seal prevents lubricant from overflowing or flowing out of the upper chamber 91. The upper bearing 20 is installed below the oil seal to ensure proper lubrication. At the sealing structure between the lower cover 105 and the drive shaft 40: the skeleton oil seal and the oil seal prevent mud and sand from entering the lower chamber 92. Oil seals are used as the upper cover seal 60 and the lower cover seal 70. When the upper cover seal 60 is damaged, the lubricating oil in the upper chamber 91 can continue to seal the connection between the drive shaft 40 and the upper cover seal 60, preventing seal failure. Similarly, when the lower cover seal 70 is damaged, the lubricating oil in the lower chamber 92 can continue to seal the connection between the drive shaft 40 and the lower cover seal 70, preventing seal failure. In other embodiments, the upper cover seal 60 and the lower cover seal 70 may consist of only one oil seal.

[0050] Furthermore, such as Figure 3 As shown, a mechanical seal 110 is provided in the lower chamber 92. The mechanical seal 110 is sleeved on the drive shaft 40. Under the action of the spring in the mechanical seal 110, the sealing surfaces at the upper and lower ends of the mechanical seal 110 are kept in a constant, tight fit with the water stain separation partition 80 and the lower cover 105, respectively, preventing sewage from entering the lower chamber 92 while ensuring the rotation of the drive shaft 40. The lower chamber 92 is filled with lubricating oil to provide good lubrication for the mechanical seal 110 and extend its service life. In other embodiments, the mechanical seal 110 may also be made of other non-mechanical sealing components.

[0051] Furthermore, such as Figure 3 As shown, the pump housing 10 and the water stain separation baffle 80 are integrally formed; the water stain separation baffle 80 includes a conical part 81 integrally extended from the inner wall of the pump housing 10, and a mounting block part 82 integrally formed at the inner end of the conical part 81. The mounting block part 82 is provided with a first mounting groove 83 for accommodating the lower bearing 30. The mounting block part 82 protrudes upward from the conical part 81 to better prevent water entering the upper chamber 91 from entering the lower bearing 30.

[0052] Furthermore, such as Figure 3As shown, the sewage pump with a sealed structure also includes a cutter head 120 and a cutting wheel 130, both located outside the pump casing 10 and at the inlet 102. The cutter head 120 and the cutting wheel 130 are stacked vertically below the impeller 50. The cutter head 120 is fixed to the bottom of the pump casing 10. The drive shaft 40 passes through the cutter head 120. The cutting wheel 130 is fixed to the drive shaft 40 and rotates with the drive shaft 40. A shearing fit structure is provided between the cutter head 120 and the cutting wheel 130. During the sewage discharge process of the sewage pump, the cutting wheel 130 rotates at high speed with the drive shaft 40, with a speed of 1800-2100 r / min. The cutter disc 120 and the cutting wheel 130 are combined to form a continuous high-speed shearing device. Every time the cutting wheel 130 rotates once, the water flowing into the flow chamber 101 from the inlet 102 is cut multiple times by the cutting wheel 130 and the cutter disc 120, thereby cutting the particles or paint flakes in the mixed liquid passing through the sewage pump inlet 102 into fine powder or tiny particles, crushing the impurities in the sewage flowing through the inlet 102, and ensuring that the sewage pump is not blocked. Then, after the rotation of the impeller 50, the mixed liquid is transported out through the outlet 103.

[0053] Preferably, the shearing fit structure between the cutter head 120 and the cutting wheel 130 can take several forms: several blades are fixedly arranged on the cutter head 120, or several blades 142 are fixedly arranged on the cutter head 120, while several axially penetrating grooves 141 are opened on the cutter head 120; several blades are fixedly arranged on the cutting wheel 130, or several blades 142 are fixedly arranged on the cutting wheel 130, while several axially penetrating grooves 141 are opened on the cutting wheel 130. The number of blades or blades 142 on the cutter head 120 is matched with the number of blades or blades 142 on the cutting wheel 130, so that the water flow is cut 6 times by the cutter head 120 and the cutting wheel 130 for every one revolution of the cutting wheel 130. Thus, the sewage is cut by the cutter head 120 and the cutting wheel 130 at a speed of 10800-12600 times / min, which more reliably ensures that the sewage pump is not blocked.

[0054] Example 1 of the shearing fit structure between the cutter head 120 and the cutting wheel 130: Figure 6 and Figure 7 As shown, both the cutting wheel 130 and the cutter head 120 are provided with multiple blade grooves 141 that extend through the axial direction. The multiple blade grooves 141 on the cutting wheel 130 and the cutter head 120 are arranged in parallel. Sewage can enter the flow chamber 101 through the blade grooves 141 on the cutting wheel 130 and the cutter head 120. When the cutting wheel 130 rotates at high speed relative to the cutter head 120, the sewage entering the flow chamber 101 is crushed by the shearing action of the opposite surfaces of the cutting wheel 130 and the cutter head 120, reducing the risk of blockage of the sewage pump.

[0055] Example 2 of the shearing fit structure between the cutter head 120 and the cutting wheel 130: Figure 8As shown, multiple blades 142 extending radially are provided on both the cutting wheel 130 and the cutter head 120. The multiple blades 142 on the cutting wheel 130 and the cutter head 120 are arranged in a ring array about their own axes. Sewage enters the flow chamber 101 through the gaps between the multiple blades 142 on the cutting wheel 130 and the cutter head 120. When the cutting wheel 130 rotates at high speed relative to the cutter head 120, the sewage entering the flow chamber 101 is crushed by the shearing action of the multiple blades 142 on the cutting wheel 130 and the cutter head 120, reducing the risk of clogging of the sewage pump.

[0056] Example 3 of the shearing fit structure between the cutter head 120 and the cutting wheel 130: Figure 9 As shown, a blade groove 141 is provided on only one of the cutting wheel 130 and the cutter head 120, and a blade 142 is provided on the other. For example, a ring array of blades 142 is provided on the cutting wheel 130, and a blade groove 141 is provided on the cutter head 120. As long as the shearing cooperation effect between the cutting wheel 130 and the cutter head 120 can be guaranteed, it will not be elaborated here.

[0057] Furthermore, such as Figure 4 and Figure 5 As shown, the sewage pump with a sealed structure also includes a connecting pipe 150 installed at the outlet 103 and a one-way valve installed on the connecting pipe 150. The pump casing 10 has an outlet pipe section 106 connecting the flow chamber 101 and the outlet 103. The outlet pipe section 106 is L-shaped, extending upwards. The connecting pipe 150 is fixed to the outlet pipe section 106. The mixed liquid flowing out from the outlet 103 is transported out through the outlet pipe section 106 and the connecting pipe 150. The connecting pipe 150 has a through-hole 151, located between the outlet 103 and the one-way valve, and the through-hole 151 is higher than the flow chamber 101. The sewage pump can be used as follows... Figure 10 The vertical installation shown is mounted on the vacuum sewage tank 170, or it can be installed as follows: Figure 11 It is installed horizontally in the vacuum sewage tank 170 as shown.

[0058] When the sewage pump is vertically installed in the vacuum sewage tank 170, such as Figure 10 As shown, when the check valve is closed but leaking air, due to the negative pressure inside the vacuum sewage tank 170, the leaking air from the check valve enters the connecting pipe 150 through the check valve. At this time, the setting of the connecting port 151 allows external air to directly enter the vacuum sewage tank 170, thereby preventing external air from entering and filling the flow chamber 101. The liquid level below the connecting port 151 will not be sucked out, and there will always be liquid in the flow chamber 101 where the impeller 50 is located inside the pump casing 10, ensuring that the sewage pump can still work normally. In addition, the connecting port 151 is located between the outlet 103 and the check valve, which can also prevent sewage from entering the upper chamber 91 and damaging the upper bearing 20 and the lower bearing 30.

[0059] When the sewage pump is horizontally installed in the vacuum sewage tank 170, a connecting pipe 150 with a connecting port 151 can be provided, in which case the pressure is balanced by the connecting port 151; in another embodiment, such as Figure 11 As shown, the connecting pipe 150 with the connecting port 151 can be omitted, and the one-way valve can be directly installed at the outlet 103 of the outlet pipe section 106. After the sewage pump is installed horizontally, its inlet 102 is higher than the outlet 103. The gas leaking from the one-way valve passes through the one-way valve, the outlet pipe section 106 and the outlet 103 of the pump casing 10, and directly enters the vacuum sewage tank 170. This will not result in insufficient liquid in the flow chamber 101 where the impeller 50 is located inside the pump casing 10, and the sewage pump can always work normally.

[0060] Furthermore, when the connecting pipe 150 is installed on the sewage pump, the preferred connection structure between the connecting pipe 150 and the outlet pipe section 106 is as follows: Figure 4 As shown, a threaded connector 160 is fixedly provided at the bottom end of the connecting pipe 150. The threaded connector 160 is threadedly connected to the water outlet pipe section 106. A rubber sealing ring is provided between the threaded connector 160 and the water outlet pipe section 106 to fill the gap between them.

[0061] Furthermore, the pump housing 10 can be a one-piece molded structure or a split structure. In this embodiment, for example... Figure 2 and Figure 3 As shown, the pump casing 10 has a split structure, including an independent upper casing 180 and a lower casing 190. The lower casing 190 is fixed to the bottom of the upper casing 180 by several bolts. The water stain separation baffle 80 is integrally formed on the inner wall of the upper casing 180. The upper chamber 91 and the lower chamber 92 are both formed inside the upper casing 180. The connecting cavity is formed inside the lower casing 190, and its upper opening is blocked by the upper casing 180. The inlet 102 and the outlet 103 are both located on the lower casing 190. The L-shaped outlet pipe section 106 is part of the lower casing 190. Preferably, the upper housing 180 is provided with a first oil inlet 181 communicating with the upper chamber 91 and a second oil inlet 182 communicating with the lower chamber 92. After the pump housing 10 is installed, appropriate lubricating oil is added to the upper chamber 91 and the lower chamber 92 through the first oil inlet 181 and the second oil inlet 182 respectively; then, the first oil inlet 181 and the second oil inlet 182 are sealed.

[0062] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A sewage pump with a sealed structure, comprising a pump casing (10) and a drive shaft (40) rotatably mounted in the pump casing (10), characterized in that: The pump casing (10) is fixedly provided with a water stain separation baffle (80), which makes the inner cavity of the pump casing (10) have an upper chamber (91). The pump casing (10) has an upper cover (104) at the top of the upper chamber (91), and the bottom of the upper chamber (91) is the water stain separation baffle (80). The drive shaft (40) passes through the upper cover (104), the upper chamber (91) and the water stain separation partition (80). An upper cover seal (60) and an upper bearing (20) installed below the upper cover seal (60) are provided between the drive shaft (40) and the upper cover (104). A lower bearing (30) is provided between the drive shaft (40) and the water stain separation partition (80). The upper chamber (91) is filled with lubricating oil. The water stain separation partition (80) extends at an angle that is lower as it moves away from the lower bearing (30), so that the bottom of the upper chamber (91) has a water stain separation groove (93) that is lower than the lower bearing (30).

2. The sewage pump with a sealed structure according to claim 1, characterized in that: The pump housing (10) and the water stain separation baffle (80) are integrally formed; the water stain separation baffle (80) includes a conical part (81) integrally extended from the inner wall of the pump housing (10) and a mounting block part (82) integrally formed at the inner end of the conical part (81), wherein the mounting block part (82) is provided with a first mounting groove (83) for accommodating the lower bearing (30).

3. The sewage pump with a sealed structure according to claim 1, characterized in that: The inner cavity of the pump casing (10) also has a lower chamber (92) that is not connected to the upper chamber (91). The upper chamber (91) and the lower chamber (92) are separated by a water stain separation partition (80). The top of the lower chamber (92) is the water stain separation partition (80). The pump casing (10) has a lower cover (105) at the bottom of the lower chamber (92). The drive shaft (40) also passes through the lower chamber (92) and the lower cover (105), and a lower cover seal (70) is provided between the drive shaft (40) and the lower cover (105). The lower chamber (92) is filled with lubricating oil. The lower chamber (92) is also provided with a mechanical seal (110), which is sleeved on the drive shaft (40). The sealing surfaces at the upper and lower ends of the mechanical seal (110) are respectively in contact with the water stain separation partition (80) and the lower cover (105).

4. The sewage pump with a sealed structure according to claim 3, characterized in that: Both the upper cover seal (60) and the lower cover seal (70) are oil seals, and both the upper cover seal (60) and the lower cover seal (70) are provided with two seals, one above the other.

5. The sewage pump with a sealed structure according to claim 1, characterized in that: The pump casing (10) is also provided with a flow chamber (101), which is an independent chamber. The bottom of the pump casing (10) is provided with an inlet (102) communicating with the flow chamber (101), and the side of the pump casing (10) is provided with an outlet (103) communicating with the flow chamber (101). The drive shaft (40) passes through the flow cavity (101), and the flow cavity (101) is provided with an impeller (50) fixed to the drive shaft (40).

6. The sewage pump with a sealed structure according to claim 5, characterized in that: The pump casing (10) is provided with a water outlet pipe section (106) connecting the flow chamber (101) and the water outlet (103), and the water outlet pipe section (106) is L-shaped and extends upward; When the sewage pump is installed horizontally in the vacuum sewage tank (170), the inlet (102) is higher than the outlet (103), and the outlet pipe section (106) is equipped with a one-way valve at the outlet (103).

7. The sewage pump with a sealed structure according to claim 5, characterized in that: The pump casing (10) is provided with a water outlet pipe section (106) connecting the flow chamber (101) and the water outlet (103), and the water outlet pipe section (106) is L-shaped and extends upward; When the sewage pump is vertically installed in the vacuum sewage tank (170), the sewage pump also includes a connecting pipe (150) installed at the outlet (103) and a one-way valve installed on the connecting pipe (150). The connecting pipe (150) is fixed to the outlet pipe section (106). The connecting pipe (150) is provided with a connecting port (151) that runs through the inside and outside. The connecting port (151) is distributed between the outlet (103) and the one-way valve. The connecting port (151) is higher than the flow chamber (101).

8. The sewage pump with a sealed structure according to claim 7, characterized in that: The bottom end of the connecting pipe (150) is fixedly provided with a threaded joint (160), which is threadedly connected to the water outlet pipe section (106). A rubber sealing ring is provided between the threaded joint (160) and the water outlet pipe section (106) to fill the gap between them.

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