Energy-saving drainage pump for washing machine

Abstract

The invention discloses an energy-saving drainage pump for a washing machine, which relates to the technical field of energy-saving water pumps and comprises a pump body, an outer barrel, a filter cartridge, 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 is connected with a first water pipe, a second water pipe and a third water pipe; the filter cartridge is arranged in the outer barrel, a plurality of filter holes are formed in the side wall of the filter cartridge, the movable rod penetrates through the outer barrel, 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, and the movable rod has a first position and a second position. When the movable rod is located at the second position, the third water pipe is communicated with the filtering hole through the water passing cavity; the driving device is used for driving the movable rod to be switched between the first position and the second position. The filter cartridge can be automatically cleaned, and the energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving water pumps, and particularly relates to an energy-saving drainage pump for a washing machine. Background Art

[0002] With the improvement of people's living standards, washing machines have now become one of the main household appliances in people's daily lives. The laundry process of a washing machine mainly includes several stages such as washing, rinsing, and drying. With the in-depth implementation of the national energy conservation and emission reduction policies and the increasing requirements for user comfort, the energy-saving and noise reduction performance of products has become increasingly important. During the laundry or drying process of a washing machine, wastewater needs to be discharged in a timely manner to ensure that it can better complete the functions of clothing washing and drying. The existing washing machine drainage pump structure has many disadvantages, mainly including: the structure is not compact enough and occupies more space; when the washing machine drainage pump pumps water upwards, a filter screen is required 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 an increase in the resistance of the filter screen to the water flow, a slowdown in the pumping speed of the drainage pump, an increase in energy consumption, and energy waste. Summary of the Invention

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

[0004] An energy-saving drainage pump for a washing machine according to an embodiment of the first aspect of the present invention includes: 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 to 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 inside the outer cylinder, and a plurality of filter holes are provided on the side wall of the filter cylinder. The filter cylinder divides the internal space of the outer cylinder into a sewage chamber and a purified water chamber, and the purified water chamber is communicated with the first water inlet; the movable rod passes through the outer cylinder, and a blocking plate and a scraping plate are arranged at intervals on the movable rod. The outer diameters of the blocking plate and the scraping plate match the inner diameter of the filter cylinder, and a water passing chamber 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 in the first position, the first water pipe and the second water pipe are communicated through the water passing chamber. When the movable rod is in the second position, the third water pipe and the filter holes are communicated through the water passing chamber; the driving device is arranged outside the outer cylinder, 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 drainage 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 driving device driving the movable rod to switch from the second position to the first position, the scraping plate scrapes leftward across the inner wall of the filter cylinder, scraping the solid impurities on the inner wall of the filter cylinder into the water passing cavity. After the movable rod moves to the first position, tap water is injected into the water passing cavity through the first water pipe to wash the solid impurities into the second water pipe, and then discharged from the second water pipe to the outer drainage pipe of the washing machine. Then the movable rod switches from the first position to the second position again. In this way, the filter cylinder is automatically cleaned, the resistance when water flows through the filter cylinder is reduced, the drainage speed is increased, the energy loss of the pump body during drainage is reduced, and the energy-saving effect is achieved.

[0006] According to some embodiments of the present invention, an impeller is provided in the pump body. When the impeller rotates, it can drive the water in the pump body to flow from the first water inlet to the first water outlet. The pump body is connected with a motor, and the 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 water inlet is provided on the first housing. The second housing is bolted with a mechanical seal part, the motor is bolted to the mechanical seal part, and the output shaft of the motor passes through the mechanical seal part.

[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 housing. The second cylinder is threadedly connected to one end of the first cylinder away from the first housing. 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 left end of the filter cylinder is open. A positioning ring is circumferentially arranged on the outer peripheral wall of the left end of the filter cylinder. A convex platform is circumferentially arranged on the inner wall of the first cylinder. The positioning ring is clamped between the left end of the convex platform 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, sealing rings are circumferentially arranged on the outer peripheral walls of both the plugging plate and the scraping plate.

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

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

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

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments, where: Figure 1 is a schematic diagram of an installation structure according to an embodiment of the present invention; Figure 2 is a cross-sectional schematic diagram when the movable rod is in the first position according to an embodiment of the present invention; Figure 3 is Figure 2 an enlarged view of part A in Figure 4 is a cross-sectional schematic diagram when the movable rod is in the second position according to an embodiment of the present invention; Figure 5 is a schematic diagram of a second cylinder body according to an embodiment of the present invention; Figure 6 is a schematic diagram of a movable rod according to an embodiment of the present invention; Figure 7 is a schematic diagram of a scraping plate according to an embodiment of the present invention; Figure 8 is a schematic diagram of a first cylinder body according to an embodiment of the present invention; Figure 9 is a schematic diagram of a filter cartridge according to an embodiment of the present invention; Figure 10 is an exploded schematic diagram of an impeller and a second housing according to an embodiment of the present invention.

[0017] Reference numerals: Pump body 100, first housing 101, second housing 102, first water inlet 110, first water outlet 120; Outer cylinder body 200, first cylinder body 201, second cylinder body 202, boss 203, first water pipe 210, water inlet valve 211, second water pipe 220, third water pipe 230; Filter cartridge 300, filter holes 310, positioning ring 320, sealing ring 321; Sewage chamber 400, purified water chamber 410; Moving rod 500, blocking plate 510, scraping plate 520, annular cleaning brush 521, water passing cavity 530, rack 540; Driving device 600, servo motor 610, driving gear 620; Impeller 700, motor 710, mechanical seal part 720. Detailed implementation mode

[0018] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which 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 drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0020] In the description of the present invention, "a plurality of" means more than two. If the first and second are described, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0022] Refer to Figures 1 to 10As shown, an energy-saving drainage pump for a washing machine according to an embodiment of the present invention includes: a pump body 100, an outer cylinder 200, a filter cylinder 300, a movable rod 500, and a driving device 600. The pump body 100 is provided with a first water inlet 110 and a first water outlet 120; the water output by the pump body 100 flows out from the first water outlet 120, and the first water outlet 120 is connected to the outer drainage pipe of the washing machine. The outer cylinder 200 is connected to the pump body 100, and the outer cylinder 200 is connected to the left side of the pump body 100. The outer cylinder 200 is connected with a first water pipe 210, a second water pipe 220, and a third water pipe 230; the first water pipe 210 is connected to the tap water pipe to input tap water into the outer cylinder 200 to wash solid impurities, the second water pipe 220 is connected to the outer drainage pipe of the washing machine, and the second water pipe 220 is used to discharge the solid impurities washed by the tap water. The third water pipe 230 is connected to the internal space of the washing machine to pump out the water inside the washing machine. The filter cylinder 300 is arranged inside the outer cylinder 200, and the filter cylinder 300 is in the shape of a cylinder with one end open. The filter cylinder 300 extends in the left-right direction. A plurality of filter holes 310 are provided on the side wall of the filter cylinder 300. For the convenience of manufacturing, a part of the side wall of the filter cylinder 300 is composed of a stainless steel filter mesh. The diameter of the filter holes 310 provided on the stainless steel filter mesh is not greater than 1 mm. The filter cylinder 300 divides the internal space of the outer cylinder 200 into a sewage chamber 400 and a purified water chamber 410, and the purified water chamber 410 is communicated with the first water inlet 110. The water in the sewage chamber 400 enters the purified water chamber 410 through the filter holes 310, and the solid impurities contained in the water in the sewage chamber 400 are filtered and adhered to the side wall of the filter cylinder 300. The water in the purified water chamber 410 enters the pump body 100 from the first water inlet 110. The purpose of filtration is to prevent the pump body 100 from being blocked and damaged by solid impurities. The movable rod 500 passes through the outer cylinder 200, and the movable rod 500 extends in the left-right direction. The movable rod 500 can move left and right. A blocking plate 510 and a scraping plate 520 are arranged on the movable rod 500 at intervals, and the blocking plate 510 and the scraping plate 520 are parallel to each other. The shapes of the blocking plate 510 and the scraping plate 520 are both circular. The outer diameters of the blocking plate 510 and the scraping plate 520 match the inner diameter of the filter cylinder 300, and a water passing chamber 530 is formed between the blocking plate 510 and the scraping plate 520. The movable rod 500 has a first position and a second position. As Figure 2 shown, when the movable rod 500 is in the first position, the first water pipe 210 and the second water pipe 220 are communicated through the water passing chamber 530, as Figure 4As shown, when the movable rod 500 is in the second position, the third water pipe 230 and the filter holes 310 are communicated through the water passing cavity 530; the driving device 600 is arranged outside the outer cylinder 200, and the driving device 600 is used to drive the movable rod 500 to switch between the first position and the second position. During the process of the movable rod 500 switching from the second position to the first position, the scraping plate 520 scrapes leftward across the inner wall of the filter cylinder 300, scraping the solid impurities on the inner wall of the filter cylinder 300 into the water passing cavity 530. After the movable rod 500 moves to the first position, tap water is injected into the water passing cavity 530 through the first water pipe 210 to wash the solid impurities into the second water pipe 220, and then discharged from the second water pipe 220 to the outer drainage pipe of the washing machine. Then the movable rod 500 switches from the first position to the second position again. Thus, automatic cleaning is completed, the resistance when water flows through the filter cylinder 300 is reduced, the drainage speed is increased, the energy loss of the pump body 100 for drainage is reduced, and the energy-saving effect is achieved.

[0023] Referring to Figure 2 、 Figure 4 and Figure 10 As shown, it can be understood that an impeller 700 is arranged in the pump body 100, and the impeller 700 is selected from the impellers 700 in common centrifugal water pumps. The specific structure of the impeller 700 is the prior art, so it will not be described in detail. When the impeller 700 rotates, it can drive the water in the pump body 100 to flow from the first water inlet 110 to the first water outlet 120. The pump body 100 is connected with a motor 710, and the motor 710 is selected as a permanent magnet synchronous motor, which has the advantage of low energy consumption. The output shaft of the motor 710 is connected to the impeller 700, and the motor 710 is used to drive the impeller 700 to rotate. 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 water inlet 110 to the first water outlet 120.

[0024] Referring to Figures 2 to 4 As shown, it can be understood that the pump body 100 includes a first housing 101 and a second housing 102, and the first housing 101 and the second housing 102 are made of engineering plastics such as polyoxymethylene and nylon. To facilitate the assembly of the impeller 700 in the pump body 100, the pump body 100 is manufactured in two parts. The first housing 101 and the second housing 102 are bolted together through a flange. It can be foreseen that a sealing rubber or sealant is provided between the first housing 101 and the second housing 102 to prevent water leakage. The first water inlet 110 is arranged on the left side of the first housing 101. The second housing 102 is bolted with a mechanical seal part 720, and the motor 710 is bolted to the mechanical seal part 720, and the output shaft of the motor 710 passes through the mechanical seal part 720. The rotary seal structure between the mechanical seal part 720 and the output shaft is the prior art, so it will not be described in detail. By separately setting the first housing 101, the second housing 102 and the mechanical seal part 720, the effect of reducing the manufacturing cost is achieved.

[0025] Referring to Figures 1 to 7 as shown, it can be understood that 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 threadedly connected to one end of the first cylinder 201 away from the first housing 101. The right end of the second cylinder 202 is provided with an external thread, and the left end of the first cylinder 201 is provided with an internal thread. The left end of the first cylinder 201 is open. The right end of the second cylinder 202 is threadedly connected 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 cartridge 300, and the inner diameter of the first cylinder 201 is greater than the outer diameter of the filter cartridge 300. Considering the manufacturing difficulty, 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, and the first cylinder 201 is integrally injection-molded with the first housing 101. They are manufactured in two parts and then connected by threads, effectively taking into account the manufacturing cost, assembly process, and structural reliability. Since the scraping plate 520 needs to move back and forth inside the second cylinder 202 and the filter cartridge 300, the inner diameters of the second cylinder 202 and the filter cartridge 300 need to be equal.

[0026] Referring to Figure 2 and Figure 9 as shown, it can be understood that the left end of the filter cartridge 300 is open, and the water containing solid impurities enters the filter cartridge 300 through the opening at the left end of the filter cartridge 300 and is filtered from the side wall of the filter cartridge 300 to the outside of the filter cartridge 300. Inside the filter cartridge 300 is part of the sewage chamber 400, and outside the filter cartridge 300 is the purified water chamber 410. A positioning ring 320 is circumferentially arranged around the outer peripheral wall at 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 into the first cylinder 201. A boss 203 is circumferentially arranged on the inner wall of the first cylinder 201. The inner diameter of the boss 203 is greater than the outer diameter of the filter cartridge 300 to facilitate 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 facilitate the boss 203 to position the positioning ring 320 in the left-right direction. The positioning ring 320 is clamped between the left end of the boss 203 and the right end of the second cylinder 202. During the process of threadedly connecting the second cylinder 202 to the first cylinder 201, the right end of the second cylinder 202 will push the positioning ring 320 to tightly abut against the left end of the boss 203, thus completing the installation and fixation of the filter cartridge 300.

[0027] Referring to 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 in 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.

[0028] Referring to Figures 2 to 8 As shown, it can be understood that sealing rings are provided around the outer peripheral walls of the blocking plate 510 and the scraping plate 520. The sealing rings are made of rubber, and the function of the sealing rings is to maintain the sealing performance of the edge of the water passing cavity 530 and prevent water from leaking from the edges of the blocking plate 510 and the scraping plate 520.

[0029] Referring to Figure 6 As shown, it can be understood that the scraping plate 520 is located on the right side of the blocking plate 510. The scraping plate 520 is connected with 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 scraping plate 520. During the process of the scraping plate 520 moving to the left, the annular cleaning brush 521 comes into contact with the inner wall of the filter cylinder 300 first. The annular cleaning brush 521 is used to assist the scraping plate 520 in cleaning the solid impurities adhered to the inner wall of the filter cylinder 300.

[0030] Referring to Figure 5 As shown, it can be understood that the driving device 600 includes a servo motor 610 and a driving gear 620. The servo motor 610 is bolted to the left end of the outer cylinder 200. The driving gear 620 is in transmission connection with the servo motor 610. The driving gear 620 is directly installed on the output shaft of the servo motor 610. A rack 540 is bolted to the side of the movable rod 500. The driving gear 620 meshes with the rack 540. The servo motor 610 drives the driving gear 620 to rotate, thereby driving the rack 540 to move in the left - right direction, so as to drive the movable rod 500 to move left and right.

[0031] Referring to Figure 2 and Figure 4 As shown, it can be understood that the first water pipe 210 is connected with a water inlet valve 211. When the movable rod 500 is in the first position, the water inlet valve 211 is opened. When the movable rod 500 is in the second position, the water inlet valve 211 is closed, thus achieving the effects of automatic flushing and saving tap water.

[0032] Working principle: When draining water, when the movable rod 500 is in the second position, the third water pipe 230 and the filtering holes 310 are communicated through the water passing cavity 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 water inlet 110 to the first water outlet 120. Under the action of negative pressure, the water inside the washing machine enters the water passing cavity 530 through the third water pipe 230. Part of the space of the water passing cavity 530 overlaps with the space of the sewage cavity 400. The water in the water passing cavity 530 enters the purified water cavity 410 through the filtering holes 310. The solid impurities contained in the water are filtered and adhered to the side wall of the filter cylinder 300. The water in the purified water cavity 410 is sucked into the pump body 100 from the first water inlet 110 and discharged to the external drainage pipe of the washing machine from the first water outlet 120.

[0033] After the drainage is completed, the motor 710 stops, and the servo motor 610 drives the driving gear 620 to rotate, thereby driving the rack 540 on the movable rod 500 to move leftward. The movable rod 500 is switched from the second position to the first position. During the process of the movable rod 500 being switched from the second position to the first position, the scraping plate 520 scrapes leftward across the inner wall of the filter cylinder 300. During the process of the scraping plate 520 moving leftward, the annular cleaning brush 521 first contacts the inner wall of the filter cylinder 300, assisting in cleaning the solid impurities adhered to the inner wall of the filter cylinder 300, scraping the solid impurities on the inner wall of the filter cylinder 300 into the water passing cavity 530, and the solid impurities move leftward following the water passing cavity 530. After the movable rod 500 moves to the first position, the first water pipe 210 and the second water pipe 220 are communicated through the water passing cavity 530. After the water inlet valve 211 is opened for 10 seconds and then closed, tap water is injected into the water passing cavity 530 through the first water pipe 210 to wash the solid impurities into the second water pipe 220, and then discharged to the external drainage pipe of the washing machine from the second water pipe 220. Then, the servo motor 610 drives the movable rod 500 to switch from the first position to the second position, completing the automatic cleaning.

[0034] 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 of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. An energy-saving drainage pump for a washing machine, characterized in that, Comprising: A pump body (100) provided with a first water inlet (110) and a first water outlet (120); An outer cylinder (200) connected to the pump body (100), and the outer cylinder (200) is connected with a first water pipe (210), a second water pipe (220) and a third water pipe (230); A filter cylinder (300) arranged inside the outer cylinder (200), with a plurality of filter holes (310) provided on the side wall of the filter cylinder (300). The filter cylinder (300) divides the inner space of the outer cylinder (200) into a sewage chamber (400) and a purified water chamber (410), and the purified water chamber (410) is communicated with the first water inlet (110); A movable rod (500) passing through the outer cylinder (200), with a blocking plate (510) and a scraping plate (520) arranged at intervals on the movable rod (500). The outer diameters of the blocking plate (510) and the scraping plate (520) match the inner diameter of the filter cylinder (300). A water passing cavity (530) is formed between the blocking plate (510) and the scraping plate (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 communicated through the water passing cavity (530). When the movable rod (500) is in the second position, the third water pipe (230) and the filter holes (310) are communicated through the water passing cavity (530); A driving device (600) arranged outside the outer cylinder (200) for driving the movable rod (500) to switch between the first position and the second position.

2. The energy-saving drainage pump for a washing machine according to claim 1, wherein: An impeller (700) is arranged 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 water inlet (110) to the first water outlet (120). The pump body (100) is connected with a motor (710) for driving the impeller (700) to rotate.

3. The energy-saving drain pump for a washing machine according to claim 2, wherein: 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 arranged on the first housing (101). The second housing (102) is bolted with a mechanical seal part (720), and the motor (710) is bolted to the mechanical seal part (720). The output shaft of the motor (710) passes through the mechanical seal part (720).

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

5. The energy-saving drain pump for a washing machine according to claim 4, wherein: The left end of the filter cartridge (300) is open. A positioning ring (320) is disposed around the outer peripheral wall of the left end of the filter cartridge (300). A boss (203) is disposed around the inner wall of the first cylinder body (201). The positioning ring (320) is clamped between the left end of the boss (203) and the right end of the second cylinder body (202).

6. The energy-saving drain pump for a washing machine according to claim 5, wherein: Sealing rings (321) are provided on both the left and right sides of the positioning ring (320).

7. The energy-saving drain pump for a washing machine according to claim 5, characterized in that: Sealing rings are disposed around the outer peripheral walls of the blocking plate (510) and the scraping plate (520).

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

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

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

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