Energy-saving drainage pump for washing machine

Abstract

The application discloses an energy-saving drainage pump for a washing machine, and relates to the technical field of energy-saving water pumps, which comprises a pump body, an outer cylinder, a filter cylinder, a movable rod and a driving device. The pump body is provided with a first water inlet and a first water outlet; the outer cylinder is connected with the pump body, and the outer cylinder is connected with a first water pipe, a second water pipe and a third water pipe; the filter cylinder is arranged in the outer cylinder, the side wall of the filter cylinder is provided with a plurality of filter holes, the movable rod is arranged in the outer cylinder, a blocking plate and a scraping plate are arranged on the movable rod at intervals, a water passing cavity is formed between the blocking plate and the scraping plate, the movable rod has a first position and a second position, when the movable rod is located at the first position, the first water pipe and the second water pipe are communicated through the water passing cavity, when the movable rod is located at the second position, the third water pipe and the filter holes are communicated through the water passing cavity; and the driving device is used for driving the movable rod to switch between the first position and the second position. The application can automatically clean the filter cylinder and reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy-saving water pumps, in particular to an energy-saving drainage pump for a washing machine. BACKGROUND

[0002] With the improvement of people's living standards, washing machines have become one of the main household appliances in people's daily life. The washing process of a washing machine mainly includes washing, rinsing and spinning. With the deepening of the national energy-saving and emission-reducing policy and the improvement of user comfort requirements, the energy-saving and mute performance of products are becoming more and more important. The washing machine needs to discharge wastewater in time during the washing or spinning process, so as to ensure that it can better complete the functions of clothes washing and spinning. The existing washing machine drainage pump structure has many shortcomings, mainly including: the structure is not compact enough and occupies more space; when the washing machine drainage pump discharges water, a filter screen is needed to filter the water. However, after the filter screen is used for a period of time, the impurities filtered by the filter screen will block the filter screen holes, resulting in that the water flow resistance of the filter screen becomes larger, the water pumping speed of the drainage pump becomes slower, the energy consumption increases, and energy is wasted. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an energy-saving drainage pump for a washing machine, which can automatically clean the filter cylinder and reduce energy consumption.

[0004] The energy-saving drainage pump for a washing machine according to the first aspect of the present application comprises a pump body, an outer cylinder body, a filter cylinder, a movable rod and a driving device. The pump body is provided with a first water inlet and a first water outlet. The outer cylinder body is connected with the pump body, and the outer cylinder body is connected with a first water pipe, a second water pipe and a third water pipe. The filter cylinder is arranged inside the outer cylinder body, and the side wall of the filter cylinder is provided with a plurality of filter holes. The filter cylinder divides the space inside the outer cylinder body into a sewage cavity and a clean water cavity, and the clean water cavity is in communication with the first water inlet. The movable rod is arranged in the outer cylinder body, and a blocking plate and a scraping plate are arranged on the movable rod at intervals. The outer diameters of the blocking plate and the scraping plate match the inner diameter of the filter cylinder, and a water passing cavity is formed between the blocking plate and the scraping plate. The movable rod has a first position and a second position. When the movable rod is located at the first position, the first water pipe and the second water pipe are in communication through the water passing cavity. When the movable rod is located at the second position, the third water pipe and the filter holes are in communication through the water passing cavity. The driving device is arranged outside the outer cylinder body, and the driving device is used to drive the movable rod to switch between the first position and the second position.

[0005] An energy-saving drain pump for a washing machine according to an embodiment of the present invention has at least the following beneficial effects: During the process of the drive device switching the movable rod from a second position to a first position, the scraper blade scrapes the inner wall of the filter cylinder to the left, scraping solid impurities from the inner wall of the filter cylinder into the water passage chamber. After the movable rod moves to the first position, tap water is injected into the water passage chamber through the first water pipe to flush the solid impurities to the second water pipe, and then discharged from the second water pipe to the washing machine's external drain pipe. Then, the movable rod switches from the first position to the second position again. This completes the automatic cleaning of the filter cylinder, reduces the resistance of water flow through the filter cylinder, accelerates the drainage speed, reduces the energy loss of the pump body during drainage, and achieves energy-saving effects.

[0006] According to some embodiments of the present invention, an impeller is provided in the pump body, and when the impeller rotates, it can drive the water in the pump body to flow from the first inlet to the first outlet. The pump body is connected to an electric motor, and the electric motor is used to drive the impeller to rotate.

[0007] According to some embodiments of the present invention, the pump body includes a first housing and a second housing, the first housing and the second housing are connected by bolts, the first inlet is disposed on the first housing, the second housing is bolted to a mechanical seal, the motor is bolted to the mechanical seal, and the output shaft of the motor passes through the mechanical seal.

[0008] According to some embodiments of the present invention, the outer cylinder includes a first cylinder and a second cylinder, the first cylinder is integrally formed with the first shell, the second cylinder is threadedly connected to the end of the first cylinder away from the first shell, the first water pipe, the second water pipe and the third water pipe are all connected to the second cylinder, the inner diameter of the second cylinder is equal to the inner diameter of the filter cylinder, and the inner diameter of the first cylinder is greater than the outer diameter of the filter cylinder.

[0009] According to some embodiments of the present invention, the filter cylinder has an opening at the left end, a positioning ring is provided around the outer peripheral wall of the left end of the filter cylinder, a boss is provided around the inner wall of the first cylinder, and the positioning ring is sandwiched between the left end of the boss and the right end of the second cylinder.

[0010] According to some embodiments of the present invention, sealing rings are provided on both the left and right sides of the positioning ring.

[0011] According to some embodiments of the present invention, both the sealing plate and the scraper are surrounded by a sealing ring on their outer peripheral walls.

[0012] According to some embodiments of the present invention, the scraper is located on the right side of the sealing plate, and the scraper is connected to an annular cleaning brush that abuts against the inner wall of the filter cylinder, the annular cleaning brush being located on the left side of the scraper.

[0013] According to some embodiments of the present invention, the driving device includes a servo motor and a drive gear. The servo motor is detachably mounted on the left end of the outer cylinder. The drive gear is connected to the servo motor in a driving connection. A rack is connected to the side of the movable rod. The drive gear meshes with the rack.

[0014] According to some embodiments of the present invention, the first water pipe is connected to an inlet valve.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of an installation structure according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the movable rod in the first position according to an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a cross-sectional schematic diagram of the movable rod in the second position according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the second cylinder according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a movable rod according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a scraper plate according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the first cylindrical body according to an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of a filter cylinder according to an embodiment of the present invention;

[0026] Figure 10 This is an exploded view of the impeller and the second housing according to one embodiment of the present invention.

[0027] Icon labels:

[0028] Pump body 100, first housing 101, second housing 102, first inlet 110, first outlet 120;

[0029] Outer cylinder 200, first cylinder 201, second cylinder 202, boss 203, first water pipe 210, water inlet valve 211, second water pipe 220, third water pipe 230;

[0030] Filter cartridge 300, filter hole 310, positioning ring 320, sealing ring 321;

[0031] Wastewater chamber 400, clean water chamber 410;

[0032] 500 movable rod, 510 sealing plate, 520 scraper, 521 annular cleaning brush, 530 water passage cavity, 540 rack;

[0033] Drive unit 600, servo motor 610, drive gear 620;

[0034] Impeller 700, motor 710, mechanical seal 720. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0037] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] Reference Figures 1 to 10As shown, an energy-saving drain pump for a washing machine according to one embodiment of the present invention includes: a pump body 100, an outer drum 200, a filter cylinder 300, a movable rod 500, and a drive device 600. The pump body 100 is provided with a first water inlet 110 and a first water outlet 120; water output from the pump body 100 flows out from the first water outlet 120, which is connected to the external drain pipe of the washing machine. The outer drum 200 is connected to the pump body 100 and is located on the left side of the pump body 100. The outer drum 200 is connected to a first water pipe 210, a second water pipe 220, and a third water pipe 230; the first water pipe 210 is connected to a tap water pipe to input tap water into the outer drum 200 to flush solid impurities, and the second water pipe 220 is connected to the external drain pipe of the washing machine to discharge solid impurities flushed by tap water. The third water pipe 230 is connected to the internal space of the washing machine to extract water from inside the washing machine. A filter cylinder 300 is located inside the outer drum 200 and is a cylindrical shape with one open end. The filter cylinder 300 extends in the left-right direction. Multiple filter holes 310 are provided on the side wall of the filter cylinder 300. For ease of manufacturing, the side wall of the filter cylinder 300 is composed of a stainless steel filter screen. The diameter of the filter holes 310 on the stainless steel filter screen is no greater than 1 mm. The filter cylinder 300 divides the internal space of the outer drum 200 into a wastewater chamber 400 and a clean water chamber 410. The clean water chamber 410 is connected to the first water inlet 110. Water in the wastewater chamber 400 enters the clean water chamber 410 through the filter holes 310. Solid impurities in the water in the wastewater chamber 400 are filtered and adhere to the side wall of the filter cylinder 300. Water in the clean water chamber 410 enters the pump body 100 from the first water inlet 110. The purpose of filtration is to prevent solid impurities from clogging and damaging the pump body 100. A movable rod 500 passes through the outer cylinder 200 and extends in the left-right direction. The movable rod 500 is capable of moving left and right. A sealing plate 510 and a scraper plate 520 are spaced apart on the movable rod 500, and the sealing plate 510 and scraper plate 520 are parallel to each other. Both the sealing plate 510 and the scraper plate 520 are circular in shape. The outer diameter of the sealing plate 510 and the scraper plate 520 matches the inner diameter of the filter cylinder 300, forming a water passage cavity 530 between the sealing plate 510 and the scraper plate 520. The movable rod 500 has a first position and a second position. Figure 2 As shown, when the movable rod 500 is in the first position, the first water pipe 210 and the second water pipe 220 are connected through the water passage cavity 530, as... Figure 4As shown, when the movable rod 500 is in the second position, the third water pipe 230 and the filter hole 310 are connected through the water passage cavity 530. The drive device 600 is located outside the outer cylinder 200 and is used to drive the movable rod 500 to switch between the first and second positions. During the process of the movable rod 500 switching from the second position to the first position, the scraper plate 520 scrapes the inner wall of the filter cylinder 300 to the left, scraping the solid impurities on the inner wall of the filter cylinder 300 into the water passage cavity 530. After the movable rod 500 moves to the first position, tap water is injected into the water passage cavity 530 through the first water pipe 210 to flush the solid impurities to the second water pipe 220, and then discharged from the second water pipe 220 to the external drain pipe of the washing machine. Then the movable rod 500 switches from the first position to the second position again. This completes the automatic cleaning, reduces the resistance of water flow through the filter cylinder 300, speeds up the drainage, reduces the energy loss of the pump body 100 during drainage, and achieves the effect of energy saving.

[0040] Reference Figure 2 , Figure 4 and Figure 10 As shown, it can be understood that an impeller 700 is installed inside the pump body 100. The impeller 700 is a common type of impeller used in centrifugal water pumps. The specific structure of the impeller 700 is existing technology and will not be described in detail. When the impeller 700 rotates, it drives the water in the pump body 100 to flow from the first inlet 110 to the first outlet 120. The pump body 100 is connected to a motor 710, which is a permanent magnet synchronous motor, known for its low energy consumption. The output shaft of the motor 710 is connected to the impeller 700, and the motor 710 drives the impeller 700 to rotate. The motor 710, through the impeller 700, drives the water in the pump body 100 to move, thus driving the water in the pump body 100 to flow from the first inlet 110 to the first outlet 120.

[0041] Reference Figures 2 to 4 As shown, the pump body 100 includes a first housing 101 and a second housing 102, both made of engineering plastics such as polyoxymethylene and nylon. To facilitate the assembly of the impeller 700 within the pump body 100, the pump body 100 is manufactured in two parts. The first housing 101 and the second housing 102 are connected by flange bolts. It is anticipated that sealing rubber or sealant will be installed between the first housing 101 and the second housing 102 to prevent leakage. The first inlet 110 is located on the left side of the first housing 101. A mechanical seal 720 is bolted to the second housing 102, and the motor 710 is bolted to the mechanical seal 720. The output shaft of the motor 710 passes through the mechanical seal 720. The rotary seal structure between the mechanical seal 720 and the output shaft is existing technology and will not be described in detail. The separate design of the first housing 101, the second housing 102, and the mechanical seal 720 reduces manufacturing costs.

[0042] Reference Figures 1 to 7 As shown, the outer cylinder 200 includes a first cylinder 201 and a second cylinder 202. To simplify the installation process, the first cylinder 201 is integrally injection molded with the first housing 101. The second cylinder 202 is threaded to the end of the first cylinder 201 away from the first housing 101. The right end of the second cylinder 202 has an external thread, and the left end of the first cylinder 201 has an internal thread. The left end of the first cylinder 201 is open. The right end of the second cylinder 202 is threaded to the left end of the first cylinder 201. The right end of the second cylinder 202 is open. The first water pipe 210, the second water pipe 220, and the third water pipe 230 are all connected to the second cylinder 202. The first water pipe 210, the second water pipe 220, and the third water pipe 230 are integrally injection molded with the second cylinder 202. The inner diameter of the second cylinder 202 is equal to the inner diameter of the filter cylinder 300, and the inner diameter of the first cylinder 201 is larger than the outer diameter of the filter cylinder 300. Considering the manufacturing difficulty, the first water pipe 210, the second water pipe 220, the third water pipe 230, and the second cylinder 202 are integrally injection molded, while the first cylinder 201 and the first shell 101 are integrally injection molded. These are manufactured in two parts and then connected by threads, effectively balancing manufacturing cost, assembly process, and structural reliability. Since the scraper 520 needs to move back and forth within the second cylinder 202 and the filter cartridge 300, the inner diameters of the second cylinder 202 and the filter cartridge 300 must be equal.

[0043] Reference Figure 2 and Figure 9 As shown, the filter cartridge 300 has an opening at its left end. Water containing solid impurities enters the filter cartridge 300 through this opening and is filtered through the side wall to the outside of the filter cartridge 300. The inside of the filter cartridge 300 is part of the wastewater chamber 400, and the outside of the filter cartridge 300 is the clean water chamber 410. A positioning ring 320 is arranged around the outer peripheral wall of the left end of the filter cartridge 300. The diameter of the positioning ring 320 is smaller than the inner diameter of the first cylinder 201 to facilitate installation inside the first cylinder 201. A boss 203 is arranged around the inner wall of the first cylinder 201. The inner diameter of the boss 203 is larger than the outer diameter of the filter cartridge 300 to allow the filter cartridge 300 to pass through. The inner diameter of the boss 203 is smaller than the outer diameter of the positioning ring 320 to position the positioning ring 320 in the left-right direction. The positioning ring 320 is sandwiched between the left end of the boss 203 and the right end of the second cylinder 202. During the process of the second cylinder 202 being threaded to the first cylinder 201, the right end of the second cylinder 202 will push the positioning ring 320 to press against the left end of the boss 203, thereby completing the installation and fixing of the filter cylinder 300.

[0044] Reference Figure 3As shown, it can be understood that sealing rings 321 are provided on both the left and right sides of the positioning ring 320. The sealing rings 321 are made of rubber. The function of the sealing rings 321 is to prevent water inside the first cylinder 201 and the second cylinder 202 from leaking to the outside through the gap between the positioning ring 320 and the second cylinder 202.

[0045] Reference Figures 2 to 8 As shown, it can be understood that sealing rings are provided around the outer peripheral walls of both the sealing plate 510 and the scraper plate 520. The sealing rings are made of rubber, and their function is to maintain the sealing of the edge of the water passage cavity 530, preventing water from leaking from the edges of the sealing plate 510 and the scraper plate 520.

[0046] Reference Figure 6 As shown, the scraper 520 is located to the right of the sealing plate 510, and the scraper 520 is connected to an annular cleaning brush 521 that abuts against the inner wall of the filter cartridge 300. The annular cleaning brush 521 is located to the left of the scraper 520. As the scraper 520 moves to the left, the annular cleaning brush 521 first contacts the inner wall of the filter cartridge 300. The annular cleaning brush 521 is used to assist the scraper 520 in cleaning the solid impurities adhering to the inner wall of the filter cartridge 300.

[0047] Reference Figure 5 As shown, the drive device 600 includes a servo motor 610 and a drive gear 620. The servo motor 610 is bolted to the left end of the outer cylinder 200. The drive gear 620 is connected to the servo motor 610 and is directly mounted on the output shaft of the servo motor 610. A rack 540 is bolted to the side of the movable rod 500, and the drive gear 620 meshes with the rack 540. The servo motor 610 drives the drive gear 620 to rotate, thereby driving the rack 540 to move in the left and right directions, thus enabling the movable rod 500 to move left and right.

[0048] Reference Figure 2 and Figure 4 As shown, it can be understood that the first water pipe 210 is connected to a water inlet valve 211. When the movable rod 500 is in the first position, the water inlet valve 211 is open. When the movable rod 500 is in the second position, the water inlet valve 211 is closed, thereby achieving the effects of automatic flushing and saving tap water.

[0049] Working principle:

[0050] During drainage, when the movable rod 500 is in the second position, the third water pipe 230 and the filter hole 310 are connected through the water passage chamber 530. The motor 710 drives the water in the pump body 100 to move through the impeller 700, driving the water in the pump body 100 to flow from the first inlet 110 to the first outlet 120. Under negative pressure, the water inside the washing machine enters the water passage chamber 530 through the third water pipe 230. Part of the space of the water passage chamber 530 overlaps with the space of the sewage chamber 400. The water in the water passage chamber 530 enters the clean water chamber 410 through the filter hole 310. Solid impurities in the water are filtered and adhere to the side wall of the filter drum 300. The water in the clean water chamber 410 is drawn into the pump body 100 from the first inlet 110 and discharged from the first outlet 120 to the washing machine's external drain pipe.

[0051] After drainage is completed, the motor 710 stops, and the servo motor 610 drives the drive gear 620 to rotate, thereby causing the rack 540 on the movable rod 500 to move to the left. This switches the movable rod 500 from the second position to the first position. During the process of switching the movable rod 500 from the second position to the first position, the scraper 520 scrapes the inner wall of the filter cylinder 300 to the left. As the scraper 520 moves to the left, the annular cleaning brush 521 first contacts the inner wall of the filter cylinder 300 to help clean the solid impurities adhering to the inner wall of the filter cylinder 300. The solid impurities on the inner wall of the filter cylinder 300 are scraped off into the water passage cavity 530, and the solid impurities move to the left with the water passage cavity 530. After the movable lever 500 moves to the first position, the first water pipe 210 and the second water pipe 220 are connected through the water passage chamber 530. The water inlet valve 211 is opened for 10 seconds and then closed. Tap water is injected into the water passage chamber 530 through the first water pipe 210 to flush solid impurities to the second water pipe 220. Then, the water is discharged from the second water pipe 220 to the washing machine's external drain pipe. Then, the servo motor 610 drives the movable lever 500 to switch from the first position to the second position to complete the automatic washing.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An energy-saving drain pump for a washing machine, characterized in that, include: Pump body (100), the pump body (100) is provided with a first inlet (110) and a first outlet (120); The outer cylinder (200) is connected to the pump body (100), and the outer cylinder (200) is connected to the first water pipe (210), the second water pipe (220) and the third water pipe (230). A filter cartridge (300) is disposed inside the outer cylinder (200). The side wall of the filter cartridge (300) is provided with a plurality of filter holes (310). The filter cartridge (300) divides the internal space of the outer cylinder (200) into a sewage chamber (400) and a clean water chamber (410). The clean water chamber (410) is connected to the first water inlet (110). A movable rod (500) is inserted through the outer cylinder (200). A sealing plate (510) and a scraper (520) are spaced apart on the movable rod (500). The outer diameter of the sealing plate (510) and the scraper (520) matches the inner diameter of the filter cylinder (300). A water passage cavity (530) is formed between the sealing plate (510) and the scraper (520). The movable rod (500) has a first position and a second position. When the movable rod (500) is in the first position, the first water pipe (210) and the second water pipe (220) are connected through the water passage cavity (530). When the movable rod (500) is in the second position, the third water pipe (230) and the filter hole (310) are connected through the water passage cavity (530). A drive device (600) is located on the outside of the outer cylinder (200). The drive device (600) is used to drive the movable rod (500) to switch between a first position and a second position. During the process of the drive device (600) driving the movable rod (500) to switch from the second position to the first position, the scraper (520) scrapes across the inner wall of the filter cylinder (300) and scrapes the impurities on the inner wall of the filter cylinder (300) into the water passage cavity (530). After the movable rod (500) moves to the first position, tap water is injected into the water passage cavity (530) through the first water pipe (210) to flush the impurities to the second water pipe (220), and then discharged from the second water pipe (220) to the external drain pipe of the washing machine. Then the movable rod (500) switches from the first position to the second position.

2. The energy-saving drain pump for a washing machine according to claim 1, characterized in that: An impeller (700) is provided inside the pump body (100). When the impeller (700) rotates, it can drive the water in the pump body (100) to flow from the first inlet (110) to the first outlet (120). The pump body (100) is connected to an electric motor (710), which is used to drive the impeller (700) to rotate.

3. The energy-saving drain pump for a washing machine according to claim 2, characterized in that: The pump body (100) includes a first housing (101) and a second housing (102), the first housing (101) and the second housing (102) are connected by bolts, the first water inlet (110) is disposed on the first housing (101), the second housing (102) is bolted to a mechanical seal (720), the motor (710) is bolted to the mechanical seal (720), and the output shaft of the motor (710) passes through the mechanical seal (720).

4. The energy-saving drain pump for a washing machine according to claim 3, characterized in that: The outer cylinder (200) includes a first cylinder (201) and a second cylinder (202). The first cylinder (201) is integrally formed with the first shell (101). The second cylinder (202) is threaded to the end of the first cylinder (201) away from the first shell (101). The first water pipe (210), the second water pipe (220), and the third water pipe (230) are all connected to the second cylinder (202). The inner diameter of the second cylinder (202) is equal to the inner diameter of the filter cylinder (300). The inner diameter of the first cylinder (201) is greater than the outer diameter of the filter cylinder (300).

5. The energy-saving drain pump for a washing machine according to claim 4, characterized in that: The filter cylinder (300) has an opening at the left end, and a positioning ring (320) is arranged around the outer peripheral wall of the left end of the filter cylinder (300). A boss (203) is arranged around the inner wall of the first cylinder (201). The positioning ring (320) is sandwiched between the left end of the boss (203) and the right end of the second cylinder (202).

6. The energy-saving drain pump for a washing machine according to claim 5, characterized in that: The positioning ring (320) is provided with sealing rings (321) on both the left and right sides.

7. The energy-saving drain pump for a washing machine according to claim 5, characterized in that: Both the sealing plate (510) and the scraper plate (520) have sealing rings surrounding their outer peripheral walls.

8. The energy-saving drain pump for a washing machine according to claim 5, characterized in that: The scraper (520) is located on the right side of the sealing plate (510), and the scraper (520) is connected to an annular cleaning brush (521) that abuts against the inner wall of the filter cylinder (300). The annular cleaning brush (521) is located on the left side of the scraper (520).

9. The energy-saving drain pump for a washing machine according to claim 1, characterized in that: The drive device (600) includes a servo motor (610) and a drive gear (620). The servo motor (610) is detachably installed on the left end of the outer cylinder (200). The drive gear (620) is connected to the servo motor (610) for transmission. A rack (540) is connected to the side of the movable rod (500). The drive gear (620) meshes with the rack (540).

10. The energy-saving drain pump for a washing machine according to claim 1, characterized in that: The first water pipe (210) is connected to an inlet valve (211).

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