Basement sewage pump

Abstract

The utility model discloses a basement sewage pump which comprises a motor body and an impeller structure connected with a shaft head of the motor body. The impeller structure comprises a plurality of rotational flow blades, the rotational flow blades are evenly distributed on the periphery of a center shaft of the impeller structure, a water flow channel is formed between every two adjacent rotational flow blades, and the impeller structure is detachably connected with the shaft head. A cooling channel is arranged outside the motor body, and cooling oil circularly flows between the cooling channel and the oil chamber. According to the scheme, the impeller structure is improved, the rotational flow blades are arranged, and the phenomena of solid jamming, fabric winding and the like existing in an existing sewage pump are avoided. Meanwhile, the problems that an existing basement sewage pump needs to be installed in a dry mode, and external cooling conditions cannot be obtained on site are solved, and self-cooling is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage pumps, and more specifically, to a basement sewage pump. Background Art

[0002] Sewage pumps can be used to pump sewage. In the basements of transportation hubs, feces and other contaminants are pumped by sewage pumps. The existing submersible electric pumps for pumping sewage and contaminants usually adopt the following several structures:

[0003] 1. The impeller adopts a single-channel impeller, and the supporting motor has no cooling measures. Although the flow channel is relatively large, which solves some problems such as solid blockage and fabric entanglement, etc., there are still the following disadvantages: ① The structure of the single-channel impeller itself is asymmetric, and the sewage pump vibrates and cannot operate smoothly; ② The motor is not fully or partially immersed in water, and the motor cannot be cooled. See the structure diagram in Figure 1 .

[0004] 2. The impeller adopts a double-channel impeller, and the supporting motor has no cooling measures. This structure has much better balance than the single-channel impeller and is the most commonly used structure for sewage pumps at present. However, there are still the following disadvantages: ① The suction port of the double-channel impeller itself is relatively small, and the fiber substances in the sewage gradually entangle and block the water pump, burning out the motor; ② The motor cannot be cooled either. See the structure diagram in Figure 2 .

[0005] 3. The impeller of the water pump itself is equipped with a reamer and a structure with a fixed cutter head. In this structure, at the inlet part of the impeller blade, there are sharp cutting tools, and there is a pair of sharp tools on the fixed cutter head. The gap between the two pairs of tools is very small, forming a scissor difference. During operation, the scissor difference is used to form a shearing action to shear the solid particles and fiber substances that enter the impeller inlet through the pipeline. After shearing, small solid particles and short fiber substances are formed and enter the impeller and are transported out by the impeller. However, there are still the following disadvantages: ① When the length direction of the fiber substance is not perpendicular to the shearing surface formed by the two pairs of tools, it is very difficult to be cut and sheared, and even blocked at the inlet. ② The addition of tools reduces the inlet flow channel. It makes it more difficult for larger solid particles and longer fiber substances to enter the impeller flow channel. ③ For the structure with its own cutting tools, the cutting device itself needs to consume a part of the power of the motor, reducing the efficiency of the unit. See the structure diagram in Figure 3 .

[0006] 4. The cooling method of the reflux sewage passing through the cooling jacket. Its structure is to connect a drainage pipe from the high-pressure chamber at the pump body outlet to the outer cooling jacket of the water pump, and introduce a reflux pipe from the outer cooling jacket of the water pump back to the water pump inlet. Disadvantages: The feces contained in the sewage directly block the reflux pipe and cannot play the role of cooling the motor. See the structure diagram in Figure 4 .

[0007] Meanwhile, when the sewage pump is being repaired, the most common repair task is to disassemble the impeller, clean the debris in the flow channel, and then reinstall the impeller. The existing problems are as follows: ① The on-site environment is harsh. Special tools such as a three-jaw puller are required to disassemble and install the impeller, which is time-consuming and laborious, with a long operation time and is not conducive to protecting the health of the operator; ② For closed impellers (single-channel impellers, double-channel impellers, mixed-flow impellers, etc.), it is difficult to clean the debris blocked in the inner cavity. Content of the Utility Model

[0008] The purpose of the present utility model is to provide a basement sewage pump to solve the technical problems existing in the above-mentioned background technology.

[0009] The technical solution of the present utility model provides a basement sewage pump, which includes a motor main body and an impeller structure connected to the shaft head of the motor main body;

[0010] The impeller structure includes several swirl vanes, which are evenly distributed on the outer periphery of the central axis of the impeller structure. A water flow channel is formed between two adjacent swirl vanes, and the impeller structure is detachably connected to the shaft head;

[0011] A cooling channel is arranged outside the motor main body, and the cooling oil circulates between the cooling channel and the oil chamber.

[0012] In a preferred embodiment, the number of the swirl vanes is 8 - 12.

[0013] In a preferred embodiment, the number of the swirl vanes is 9.

[0014] In a preferred embodiment, an installation hole corresponding to the shaft head is arranged in the middle of the hub of the impeller structure. The impeller structure sleeve is arranged outside the shaft head, and the hub and the shaft head are fixed by a locking bolt.

[0015] In a preferred embodiment, the installation hole has a tapered structure with a wider upper part and a narrower lower part, and the taper is 1:10.

[0016] In a preferred embodiment, a general screw hole is arranged through the center of the hub, and an installation screw hole corresponding to the general screw hole is arranged on the shaft head. The locking bolt passes through the general screw hole and is screwed into the installation screw hole.

[0017] In a preferred embodiment, an axial-flow impeller is connected to the shaft body of the motor main body, and the axial-flow impeller is located in the oil chamber.

[0018] In a preferred embodiment, an inner cooling sleeve and an outer cooling sleeve are sequentially arranged outside the motor body. The cooling channels include a first channel between the inner cooling sleeve and the motor housing and a second channel between the outer cooling sleeve and the inner cooling sleeve. The first channel is communicated with the second channel, and the cooling oil sequentially flows through the first channel and the second channel and then returns to the oil chamber.

[0019] The beneficial effects of the technical solution of the present utility model are as follows:

[0020] 1. This solution enables the sewage pump to operate smoothly, with less noise and vibration, and has no impact on people in crowded places such as transportation hubs. By improving the impeller structure and setting swirl vanes, the present utility model solves the problems of solid jamming and fabric entanglement existing in existing sewage pumps.

[0021] 2. This solution solves the problem that existing basement sewage pumps require dry installation and external cooling conditions cannot be obtained on site, and realizes self-cooling.

[0022] 3. The impeller structure and the shaft head of this solution are set with a certain taper ratio, and at the same time, through the design of the fixing method, the problem that the sewage pump cannot be quickly disassembled and assembled in a harsh environment is solved. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a sewage pump with a single-channel impeller in the prior art.

[0024] Figure 2 It is a schematic structural diagram of a sewage pump with a double-channel impeller in the prior art.

[0025] Figure 3 It is a schematic structural diagram of a sewage pump with a reamer on the impeller itself in the prior art.

[0026] Figure 4 It is a schematic structural diagram of a sewage pump in which the reflux sewage is cooled by a cooling sleeve in the prior art.

[0027] Figure 5 It is a schematic overall structure diagram of the present utility model.

[0028] Figure 6 It is a schematic diagram of the swirl vanes of the present utility model.

[0029] Figure 7 It is a schematic diagram of the fixation of the impeller structure and the shaft head of the present utility model.

[0030] Figure 8 It is a schematic diagram of the disassembly of the impeller structure and the shaft head of the present utility model.

[0031] Figure 9 It is the flow principle of the sewage pump of the present utility model.

[0032] Description of the reference numerals: 1 motor main body, 11 shaft body, 12 shaft head, 13 mounting screw holes, 14 oil chamber, 2 impeller structure, 21 swirl vanes, 22 hub, 23 mounting holes, 24 general screw holes, 3 locking bolts, 4 internal cooling sleeve, 5 external cooling sleeve, 6 passage one, 7 passage two, 8 axial flow impeller, 9 disassembly bolt. Detailed implementation manners

[0033] The following further elaborates on the present utility model. The embodiments of the present utility model are given for the convenience of illustration and description, rather than being exhaustive or limiting the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

[0034] As Figures 5-8 shown, the technical solution of the present utility model provides a basement sewage pump, including a motor main body 1 and an impeller structure 2 connected to the shaft head 12 of the motor main body 1. The impeller structure 2 includes a plurality of swirl vanes 21, and the swirl vanes 21 are evenly distributed on the outer periphery of the central axis of the impeller structure 2. A water flow channel is formed between two adjacent swirl vanes 21, and the impeller structure 2 is detachably connected to the shaft head 12.

[0035] In the above solution, the impeller structure 2 rotates to generate a swirl field, forming a radial pressure difference, and sucking sewage and dirt from the inlet, passing through the swirl field, and conveying it to the pump outlet. Solid particles and fibrous substances in the sewage are conveyed out through the action of the swirl field during the entire flow process without contacting the impeller. Therefore, the pump is not blocked by solid particles and not entangled by fibrous substances, truly achieving no solid blockage and fabric entanglement.

[0036] The impeller structure 2 retracts into the pump chamber behind the volute chamber. When the impeller structure 2 rotates, a through-flow and a circulating flow are formed in the bladeless chamber in front of the impeller structure 2. The through-flow is mainly liquid (water), which enters the pump chamber through the water flow channels between the swirl vanes 21 and then flows out, while the circulating flow circulates in the bladeless chamber. Since the middle part of the circulating flow is a low-pressure area, solid particles or long fibers are sucked into this area and flow out under the drive of the swirl. The flow principle is as Figure 9 shown.

[0037] As the number of blades increases, the effect of the blades on the liquid is enhanced, the flow slip in the case of a finite number of blades is weakened, and generally speaking, as the number of blades increases, the head of the pump increases. In addition, the diffusion of the flow passage between the blades of the sewage pump is very serious. When slip is not considered, the relative velocity is equal to the meridional velocity, so the diffusion of the relative velocity is also very serious. The axial vortex flow between the swirl blades 21 is very strong, causing the flow between the blades to be disordered and generating a considerable additional hydraulic loss. Appropriately increasing the number of swirl blades 21 will improve this flow state and increase the efficiency of the pump. If the thickness of the swirl blades 21 is thin and the number of swirl blades 21 is increased at the same time, the result of significantly increasing the head and efficiency can be achieved. The swirl blades 21 of the sewage pump are usually set to 8 - 12 pieces, and are set to 9 pieces in this embodiment. If the number of blades is too large, the blockage is serious, the surface friction loss increases, and the efficiency will decrease.

[0038] A mounting hole 23 corresponding to the shaft head 12 is provided in the middle of the hub 22 of the impeller structure 2. The impeller structure 2 is sleeved outside the shaft head 12, and the hub 22 and the shaft head 12 are fixed by a locking bolt 3. The mounting hole 23 has a tapered structure with a wider upper part and a narrower lower part, and the taper is 1:10. This taper design is to enable the hub 22 to be smoothly sleeved outside the shaft head 12 during installation. After the sleeving is completed, it is fixed by the locking bolt 3.

[0039] A general-purpose screw hole 24 runs through the center of the hub 22. The shaft head 12 is provided with a mounting screw hole 13 corresponding to the general-purpose screw hole 24. The locking bolt 3 passes through the general-purpose screw hole 24 and is screwed into the mounting screw hole 13 to fix the hub 22 and the shaft head 12. After installation, the impeller structure 2 can rotate following the motor shaft body 11. On the one hand, the general-purpose screw hole 24 can be used for the locking bolt 3 to pass through to fix the hub 22 and the shaft head 12. On the other hand, the impeller structure 2 can be disassembled by screwing in a disassembly bolt 9 that fits it. Because there is a certain frictional force after the impeller structure 2 is sleeved with the shaft head 12, and due to position restrictions, it is very difficult to pull it off by external force. After the locking bolt 3 is disassembled, the disassembly bolt 9 is screwed in, and the disassembly bolt 9 abuts against the end of the shaft head 12, enabling the disassembly of the impeller structure 2 without external tools such as a three-jaw puller, and it is time-saving and labor-saving.

[0040] In this solution, a cooling channel is provided outside the motor main body 1, and the cooling oil circulates between the cooling channel and the oil chamber 14. An axial-flow impeller 8 is connected to the shaft body 11 of the motor main body 1, and the axial-flow impeller 8 is located in the oil chamber 14. An inner cooling sleeve 4 and an outer cooling sleeve 5 are sequentially arranged outside the motor main body 1. The cooling channel includes a channel one 6 between the inner cooling sleeve 4 and the motor housing and a channel two 7 between the outer cooling sleeve 5 and the inner cooling sleeve 4. The channel one 6 is communicated with the channel two 7, and the cooling oil flows through the channel one 6 and the channel two 7 in sequence and returns to the oil chamber 14.

[0041] The axial flow impeller 8 is placed into the internal oil chamber 14, and the internal oil chamber 14 is filled with a sufficient amount of cooling oil. The cooling oil is conveyed to the surface of the motor housing through the axial flow impeller 8. Two layers of oil cooling sleeves with condensation structures are added outside the motor housing. The axial flow impeller 8 rotates to convey the cooling oil to the surface of the motor, flowing through the first channel 6 and the second channel 7 in sequence, and heat exchange is achieved through the external cooling sleeve 5 and the ambient air temperature. After the temperature is reduced, the cooling oil returns to the inlet of the axial flow impeller 8 to realize the cooling self-circulation. There is no need for external cooling forced cooling, nor is it necessary to cool through the conveyed medium (sewage containing feces and fibrous substances). In this way, there is no need to connect external cooling water, or to semi-submerge or fully submerge the water pump in water, and there is no worry about problems such as feces clogging the cooling pipes, making it safer to use.

[0042] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without making creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A basement sewage pump, characterized in that: It includes a motor main body and an impeller structure connected to the shaft head of the motor main body; The impeller structure includes a number of swirl vanes, the swirl vanes are evenly distributed on the outer periphery of the central axis of the impeller structure, a water flow channel is formed between two adjacent swirl vanes, and the impeller structure is detachably connected to the shaft head; A cooling channel is provided outside the motor main body, and cooling oil circulates between the cooling channel and the oil chamber.

2. The submersible sewage pump according to claim 1, characterized in that: The number of the swirl vanes is 8 - 12.

3. The submersible sewage pump according to claim 2, characterized in that: The number of the swirl vanes is 9.

4. The submersible sewage pump according to claim 1, wherein: An installation hole corresponding to the shaft head is provided in the middle of the hub of the impeller structure, the impeller structure sleeve is arranged outside the shaft head, and the hub is fixed with a locking bolt to the shaft head.

5. The sump pump according to claim 4, wherein: The installation hole has a tapered structure with a wider upper part and a narrower lower part, and the taper is 1:

10.

6. The submersible sewage pump according to claim 1, characterized in that: A general screw hole is penetrated through the center of the hub, an installation screw hole is provided on the shaft head corresponding to the general screw hole, and the locking bolt passes through the general screw hole and is screwed into the installation screw hole.

7. The sump pump according to claim 1, characterized in that: An axial flow impeller is connected to the shaft body of the motor main body, and the axial flow impeller is located in the oil chamber.

8. The sump pump according to claim 1, wherein: An inner cooling sleeve and an outer cooling sleeve are sequentially arranged outside the motor main body, the cooling channel includes a channel one between the inner cooling sleeve and the motor housing and a channel two between the outer cooling sleeve and the inner cooling sleeve, the channel one is communicated with the channel two, and the cooling oil flows through the channel one and the channel two in sequence and returns to the oil chamber.

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