Low-liquid-level sewage suction pump

Abstract

The utility model discloses a low liquid level suction sewage pump which comprises an upper cover, an outer shell and a bottom shell which are detachably installed in sequence from top to bottom, a motor placing frame is arranged in the outer shell, the motor placing frame is provided with a placing groove, and a motor is arranged in the placing groove of the motor placing frame; a motor containing frame is arranged in the outer shell, a water passing channel is formed between the motor containing frame and the inner wall of the outer shell, a water passing cavity communicated with the water passing channel is formed in the upper end face of the bottom shell, an impeller is arranged in the bottom shell, and an output shaft of the motor vertically extends into the bottom shell, is fixedly connected with the impeller and is used for driving the impeller to rotate. According to the design, the water passing channel is designed on the outer side of the motor, when water is pumped at a low liquid level, pumped water can be discharged into the water passing channel through the water passing cavity, and at the moment, the motor inside can be cooled through sewage, so that the phenomenon that the motor is burnt due to overheating is reduced, and the motor can be used at the low liquid level.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage pumps, in particular to a low-liquid-level suction sewage pump. Background Art

[0002] Sewage pump is a kind of centrifugal impurity pump, which has many forms: submersible type and dry type. Sewage pump is a water pump used for sewage discharge.

[0003] At present, the heat dissipation of sewage pumps mainly relies on the water itself. When the pump is in a low liquid level, the motor may be above the liquid level. Due to the lack of heat dissipation of the water itself, the motor may easily overheat and burn out.

[0004] In view of this, a low liquid level suction sewage pump is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a low liquid level suction sewage pump in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the utility model is as follows: a low liquid level suction sewage pump, comprising an upper cover, an outer shell and a bottom shell which are detachably installed from top to bottom in sequence, a motor placement frame is provided inside the outer shell, the motor placement frame has a placement groove, and a motor is provided in the placement groove of the motor placement frame; a water passage is formed between the motor placement frame and the inner wall of the outer shell, and a water passage cavity connected to the water passage is opened on the upper end surface of the bottom shell.

[0007] In a preferred embodiment, an impeller is provided inside the bottom shell, and the output shaft of the motor vertically extends into the bottom shell and is fixedly connected to the impeller to drive the impeller to rotate.

[0008] In a preferred embodiment, a water suction port is extended downward from the bottom center of the bottom shell, and a protective cover is provided on the outer end of the water suction port. The protective cover is installed at the bottom of the bottom shell, and a plurality of water permeable holes are opened circumferentially on the protective cover.

[0009] In a preferred embodiment, the motor placement frame is made entirely of aluminum alloy material.

[0010] In a preferred embodiment, a through hole is formed on the bottom wall of the outer shell to allow the output shaft to extend out, and a sealing ring is embedded in the through hole to be interference fit with the output shaft.

[0011] In a preferred embodiment, an opening is provided at the upper end of the motor placement frame, and the bottom wall of the upper cover protrudes downward to form a sealing protrusion for sealing the opening of the motor placement frame, and the bottom wall of the sealing protrusion is embedded with a silicone sealing ring that fits with the upper wall of the motor placement frame.

[0012] In a preferred embodiment, a water outlet communicating with the water passage cavity is provided on the upper side of the outer shell, and a plurality of groups of reinforcing ribs are circumferentially distributed on the outer end surface of the outer shell.

[0013] In a preferred embodiment, a liquid level sensor is provided in the bottom shell on the upper side of the water outlet.

[0014] In a preferred embodiment, handles are provided on both sides of the upper end of the upper cover.

[0015] In a preferred embodiment, a support seat is circumferentially installed at the bottom of the bottom shell, and the bottom end surface of the support seat is on the same horizontal line as the bottom surface of the protective cover.

[0016] In summary, due to the adoption of the above-mentioned technical scheme, the beneficial effect of the utility model is as follows: the water passage is designed on the outside of the motor, and when pumping water at a low liquid level, the pumped water will be discharged into the water passage through the water passage chamber. At this time, the internal motor can be cooled by the sewage, thereby reducing the phenomenon of overheating and burning. It can meet the use in low liquid levels without increasing the cost, and has advantages that current products do not have. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view planar structure schematic diagram of the utility model as a whole;

[0018] Figure 2 It is a structural cross-sectional view of the entire utility model.

[0019] Markings in the figure: 1-handle, 2-upper cover, 3-water outlet, 4-outer shell, 5-bottom shell, 6-protective cover, 7-support seat, 8-water suction port, 9-impeller, 10-sealing ring, 11-water passage, 12-output shaft, 13-motor placement frame, 14-motor, 15-silicone sealing ring, 16-liquid level sensor. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] Reference Figure 1-2A low liquid level suction sewage pump comprises an upper cover 2, an outer shell 4 and a bottom shell 5 which are detachably installed from top to bottom. A motor placement frame 13 is provided inside the outer shell 4. The motor placement frame 13 has a placement groove. A motor 14 is provided in the placement groove of the motor placement frame 13. A water passage 11 is formed between the motor placement frame 13 and the inner wall of the outer shell 4. A water passage cavity 17 connected to the water passage 11 is formed on the upper end surface of the bottom shell 5. The water passage 11 is designed on the outside of the motor 14. When pumping water at a low liquid level, the pumped water will be discharged into the water passage 11 through the water passage cavity 17. At this time, the internal motor 14 can be cooled by sewage, thereby reducing the phenomenon of overheating and burning. Without increasing the cost, it can meet the use in low liquid levels.

[0022] In addition, in order to ensure the strong support strength, a plurality of support columns (not shown) are distributed circumferentially between the motor placement frame 13 and the outer shell 4 .

[0023] Furthermore, an impeller 9 is provided inside the bottom shell 5, and the output shaft 12 of the motor 14 extends vertically into the bottom shell 5 and is fixedly connected to the impeller 9 for driving the impeller 9 to rotate. When the motor 14 works, it drives the impeller 9 to rotate and generates centrifugal force to achieve normal water pumping.

[0024] Furthermore, a water suction port 8 is formed by extending downward from the bottom center of the bottom shell 5, and a protective cover 6 is provided on the outer end cover of the water suction port 8. The protective cover 6 is installed at the bottom of the bottom shell 5, and a plurality of water permeable holes are opened circumferentially on the protective cover 6. The protective cover 6 can prevent foreign matter in sewage from entering the pump body, thereby ensuring the normal operation of the pump body, and the water permeable holes can also meet the normal entry of water.

[0025] Furthermore, the motor placement frame 13 is made entirely of aluminum alloy material. Since aluminum alloy has good thermal conductivity, the heat of the motor 14 can be dissipated outwards, and the internal motor is cooled by sewage during the dissipation.

[0026] Furthermore, a through hole is formed on the bottom wall of the outer shell 4 to allow the output shaft 12 to extend out, and a sealing ring 10 is embedded in the through hole and is interference fit with the output shaft 12. The sealing ring 10 can improve the sealing between the output shaft 12 and the through hole to prevent water from entering the motor placement frame 13 through the through hole.

[0027] Furthermore, an opening is provided at the upper end of the motor placement frame 13, and the bottom wall of the upper cover 2 protrudes downward to form a sealing protrusion for sealing the opening of the motor placement frame 13, and the bottom wall of the sealing protrusion is embedded with a silicone sealing ring 15 that fits with the upper wall of the motor placement frame 13. The opening is designed so that when the motor 14 needs maintenance or replacement, the upper cover 2 can be removed and the motor 14 can be taken out using the opening. At the same time, the silicone sealing ring 15 can also improve the sealing between the sealing protrusion and the motor placement frame 13, thereby preventing sewage from entering the motor placement frame 13 through the opening.

[0028] Furthermore, a water outlet 3 communicating with the water passage cavity 17 is provided on the upper side of the outer shell 4, and a plurality of groups of reinforcing ribs are distributed circumferentially on the outer end surface of the outer shell 4, and the overall strength of the outer shell 4 can be improved by the reinforcing ribs.

[0029] Furthermore, a liquid level sensor 16 is provided at the upper end of the water passage 11, and a power cord and a PCB main board (not shown in the figure) are also designed on the outer shell 4. The PCB main board is electrically connected to the liquid level sensor 16 and the motor 14. The real-time pumped liquid level is monitored by the liquid level sensor 16. When the liquid level is lower than the set range, the motor 14 can be controlled to stop working through the PCB main board to prevent idling.

[0030] Among them, the above electrical connection method is an existing technology that has been implemented, and the specific structure will not be explained here.

[0031] Furthermore, handles 1 are provided on both sides of the upper end of the upper cover 2, and the handles 1 can facilitate personnel to carry the pump body.

[0032] Furthermore, a support seat 7 is circumferentially installed at the bottom of the bottom shell 5, and the bottom end surface of the support seat 7 is on the same horizontal line as the bottom surface of the protective cover 6. The advantage of the above design is that it can realize low water level extraction while preventing foreign matter from entering the pump body through the water suction port 8.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-liquid-level suction sewage pump, comprising an upper cover, an outer shell and a bottom shell which are detachably installed from top to bottom, characterized in that: A motor placement frame is provided inside the outer shell, the motor placement frame has a placement groove, and a motor is provided in the placement groove of the motor placement frame; A water passage is formed between the motor placement frame and the inner wall of the outer shell, and a water passage cavity connected to the water passage is formed on the upper end surface of the bottom shell.

2. A low liquid level suction sewage pump according to claim 1, characterized in that: An impeller is arranged inside the bottom shell, and the output shaft of the motor vertically extends into the bottom shell and is fixedly connected to the impeller to drive the impeller to rotate.

3. A low-liquid-level suction sewage pump according to claim 1, characterized in that: The bottom center of the bottom shell extends downward to form a water suction port, and the outer end cover of the water suction port is provided with a protective cover, which is installed at the bottom of the bottom shell, and a plurality of water permeable holes are opened circumferentially on the protective cover.

4. A low-liquid-level suction sewage pump according to claim 1, characterized in that: The motor placement frame is made entirely of aluminum alloy material.

5. A low-liquid-level suction sewage pump according to claim 2, characterized in that: A through hole is formed on the bottom wall of the outer shell to allow the output shaft to extend out, and a sealing ring which is interference-fitted with the output shaft is embedded in the through hole.

6. A low-liquid-level suction sewage pump according to claim 1, characterized in that: The upper end of the motor placement frame is provided with an opening, the bottom wall of the upper cover protrudes downward to form a sealing protrusion for sealing the opening of the motor placement frame, and the bottom wall of the sealing protrusion is embedded with a silicone sealing ring that fits the upper wall of the motor placement frame.

7. A low-liquid-level suction sewage pump according to claim 1, characterized in that: The upper side of the outer shell is provided with a water outlet communicated with the water passage cavity, and the outer end surface of the outer shell is circumferentially distributed with a plurality of groups of reinforcing ribs.

8. A low-liquid-level suction sewage pump according to claim 1, characterized in that: A liquid level sensor is arranged at the upper end of the water passage.

9. A low-liquid-level suction sewage pump according to claim 1, characterized in that: Handles are arranged on both sides of the upper end of the upper cover.

10. A low-liquid-level suction sewage pump as claimed in claim 3, characterized in that: A support seat is circumferentially installed at the bottom of the bottom shell, and the bottom end surface of the support seat is on the same horizontal straight line as the bottom surface of the protective cover.

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