A submersible pump with protective function

Abstract

The present invention relates to the field of submersible pumps, and in particular to a submersible pump with a protective function. A submersible pump with a protective function includes a submersible pump body, a connecting cylinder, a protective base, a reciprocating unit, and a screen, etc.; the submersible pump body is connected to the protective base; a connecting cylinder is detachably connected between the submersible pump body and the protective base; the connecting cylinder is connected to the reciprocating unit; the connecting cylinder is fixedly connected to a screen, which is a flexible screen; the screen is connected to the reciprocating unit; the reciprocating unit is used to drive the screen to expand and contract, and clean the screen. The present invention sets a movable cylinder and utilizes the up and down movement of the movable cylinder to achieve switching of the water flow channel. Compared with a single-channel submersible pump, the maintenance frequency is reduced, and the screen is expanded and contracted, and impurities intercepted on the screen are shaken off, realizing automatic cleaning of the screen, further extending the trouble-free operation time of the submersible pump, and further reducing the frequency of manual maintenance, saving time and energy.

Description

Technical Field

[0001] The present invention relates to the field of submersible pumps, in particular to a submersible pump with a protective function. Background Art

[0002] In fish tanks or aquariums, submersible pumps are generally used to filter the water. Therefore, submersible pumps are an important part of the filtration system of fish tanks or aquariums and a key factor in determining the water quality of fish tanks or aquariums.

[0003] According to different breeding needs, some aquatic animals are not suitable for bare tank breeding. Generally, a layer of bottom sand is laid in the bare tank and aquatic plants are planted. However, the activities of aquatic animals will generate a large amount of waste, which will reduce the water quality. The bottom sand will also be lifted up during the activities. The bottom sand and corresponding impurities will be drawn into the submersible pump, which will easily cause the rotor of the submersible pump to wear, and then cause the submersible pump to vibrate and make noise, which will reduce the service life of the submersible pump. Therefore, a filter is generally set to filter it. However, the submersible pumps currently on the market are generally single-channel. After the filter is blocked, it needs to be cleaned manually. The maintenance frequency of submersible pumps in fish tanks or aquariums with high breeding density is high, which consumes a lot of time and energy. Summary of the Invention

[0004] In order to overcome the shortcomings of existing single-channel submersible pumps, which require manual cleaning after the filter is blocked, have high maintenance frequency, and consume a lot of time and energy, the present invention provides a submersible pump with a protective function.

[0005] The technical solution is: a submersible pump with a protective function, including a submersible pump body, a connecting cylinder and a protective base; the submersible pump body is connected to the protective base; the submersible pump body and the protective base are detachably connected with a connecting cylinder; it also includes a reciprocating unit, a screen, a first U-shaped plate, a first electric actuator, a movable cylinder and a filter screen; the connecting cylinder is connected to the reciprocating unit; the connecting cylinder is fixedly connected to the screen, which is a flexible screen; the screen is connected to the reciprocating unit; the reciprocating unit is used to drive the screen to expand and contract to clean the screen; the bottom of the screen is connected to the protective base; an annular cavity is opened in the connecting cylinder; the annular Three first U-shaped plates are fixed in the cavity; three first electric actuators are installed in the connecting cylinder; each first electric actuator corresponds to a first U-shaped plate; three straight slide grooves are opened in the annular cavity; the telescopic parts of all the first electric actuators are fixed to the movable cylinder through sliding rods, and each sliding rod slides in a straight slide groove; several diversion ports are opened in the lower part of the annular cavity; the diversion ports are all located on the outside of the blocking net; the movable cylinder is located on the inside of the blocking net; the movable cylinder is slidably connected to the connecting cylinder; several filter screens are installed in the annular cavity; the movable cylinder cooperates with all the filter screens, and the movable cylinder is used to seal all the filter screens.

[0006] Furthermore, the reciprocating unit includes a second U-shaped plate, a second electric actuator, a fixed ring, a movable ring and a connecting rod; three second U-shaped plates are fixed in the annular cavity; a second electric actuator is installed in each second U-shaped plate; a fixed ring is fixed to the upper part of the blocking net; a movable ring is fixed to the lower part of the blocking net; the fixed ring is fixed to the connecting tube; each telescopic part of the second electric actuator is connected to a connecting rod; all the connecting rods pass through the annular cavity and are slidably connected to the connecting tube; all the connecting rods are fixed to the movable ring; all the connecting rods are located on the inner side of the blocking net.

[0007] Furthermore, it also includes sealing sheets connected to the annular cavity; each sealing sheet corresponds to a diversion port.

[0008] Furthermore, the sealing sheet is made of rubber.

[0009] Furthermore, a side of the sealing sheet close to the filter screen is fixedly connected to the bottom of the annular cavity.

[0010] Furthermore, a first sealing ring is screwed onto the connecting cylinder, and the first sealing ring is used to seal the annular cavity.

[0011] Furthermore, a plurality of anti-slip grooves are provided in an annular array on the first sealing ring, so as to facilitate removal of the first sealing ring from the annular cavity.

[0012] Furthermore, a grid is provided in a circular array on the protective base.

[0013] Furthermore, it also includes a contact piece fixedly connected to the protective base, with a cavity inside the contact piece; a deformable annular capsule is provided on the contact piece, which is connected to the cavity inside the contact piece; an annular drain port is provided on the contact piece, which is connected to the cavity inside the contact piece; the drain port is located on the inner side of the annular capsule; a diversion chamber is provided in the movable cylinder, and an opening is provided at the lower part of the diversion chamber; the diversion chamber cooperates with the drain port; a plurality of water spray ports are provided on the side of the movable cylinder facing the block net; the diversion chamber is connected to all the water spray ports; a plurality of water inlets are provided on the contact piece, which are connected to the cavity inside the contact piece; a one-way valve is provided in the water inlet, which only allows water in the connecting cylinder to flow to the cavity inside the contact piece; the drain port is slidably connected to a second sealing ring; the second sealing ring is provided with a plurality of limit grooves; a plurality of limit rods are fixed in the drain port; each limit rod is located in a limit groove.

[0014] Furthermore, a sealing strip is provided at the lower part of the movable cylinder.

[0015] The beneficial effects are: 1. The present invention sets a movable cylinder and utilizes the up and down movement of the movable cylinder to realize the switching of the water flow channel. Compared with the single-channel submersible pump, the maintenance frequency is reduced, and the blocking net is expanded and contracted, and the impurities intercepted on the blocking net are shaken off, realizing automatic cleaning of the blocking net, further extending the time of barrier-free use of the submersible pump, and further reducing the frequency of manual maintenance, saving time and energy.

[0016] 2. By setting the contact piece, when the movable ring is used to move up and down to deform the screen, the movable ring squeezes the annular bag, thereby squeezing the water in the contact piece into the diversion cavity of the movable cylinder, and then backwashing the screen through various water nozzles, effectively reducing the stubborn residual impurities in the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the submersible pump with protective function of the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the connecting tube and the protective base of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the connecting tube and the protective base of the present invention;

[0020] Figure 4 This is a schematic diagram of the installation position of the movable cylinder of the present invention;

[0021] Figure 5 This is a schematic diagram of the installation position of the sealing sheet of the present invention;

[0022] Figure 6 This is a schematic diagram of the cooperation between the lower part of the movable cylinder and the drain outlet of the present invention;

[0023] Figure 7 It is a cross-sectional schematic diagram of the contact piece and the second sealing ring of the present invention.

[0024] Figure numbers: 1-submersible pump body, 2-connecting cylinder, 3-protective base, 4-second U-shaped plate, 5-second electric actuator, 6-fixed ring, 7-movable ring, 8-blocking net, 9-connecting rod, 10-first U-shaped plate, 11-first electric actuator, 12-movable cylinder, 13-filter screen, 14-sealing plate, 15-contact piece, 16-second sealing ring, 17-limiting rod, 2001-annular cavity, 2002-slotted slide, 2003-diverter port, 2004-first sealing ring, 1201-diverter cavity, 1202-water outlet, 1501-annular capsule, 1502-drainage outlet, 1503-water inlet, 1601-limiting groove. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0026] The first embodiment

[0027] A submersible pump with protective function, according to Figure 1-Figure 5 As shown, it includes a submersible pump body 1, a connecting tube 2 and a protective base 3; the lower part of the submersible pump body 1 is bolted to the protective base 3; the connecting tube 2 is detachably connected between the submersible pump body 1 and the protective base 3;

[0028] It also includes a reciprocating unit, a blocking net 8, a first U-shaped plate 10, a first electric actuator 11, a movable cylinder 12 and a filter screen 13; the connecting cylinder 2 is connected to the reciprocating unit; the bottom of the connecting cylinder 2 is fixedly connected to the blocking net 8, which is a flexible net; the blocking net 8 is connected to the reciprocating unit; the bottom of the blocking net 8 is connected to the protective base 3; an annular cavity 2001 is opened in the connecting cylinder 2; three first U-shaped plates 10 distributed in an annular array are fixedly connected in the annular cavity 2001; three first electric actuators 11 distributed in an annular array are installed in the connecting cylinder 2; the first electric actuator 11 is an electric push rod; each first electric actuator 11 corresponds to a A first U-shaped plate 10; three straight slide grooves 2002 distributed in a circular array are opened in the annular cavity 2001; the telescopic parts of all the first electric actuators 11 are fixedly connected to the movable cylinder 12 through a sliding rod, and each sliding rod slides in a straight slide groove 2002; a plurality of equally distributed diversion ports 2003 are opened in the lower part of the annular cavity 2001; the diversion ports 2003 are all located on the outside of the blocking net 8; the movable cylinder 12 is located on the inside of the blocking net 8; the movable cylinder 12 is slidably connected to the connecting cylinder 2; a plurality of equally distributed filter screens 13 are installed in the annular cavity 2001; the movable cylinder 12 cooperates with all the filter screens 13.

[0029] The reciprocating unit includes a second U-shaped plate 4, a second electric actuator 5, a fixed ring 6, a movable ring 7 and a connecting rod 9; three second U-shaped plates 4 distributed in a circular array are fixedly connected in the annular cavity 2001; a second electric actuator 5 is installed in each second U-shaped plate 4; the second electric actuator 5 is an electric push rod; a fixed ring 6 is fixedly connected to the upper part of the blocking net 8; a movable ring 7 is fixedly connected to the lower part of the blocking net 8; the fixed ring 6 is fixedly connected to the connecting tube 2; each telescopic part of the second electric actuator 5 is connected to a connecting rod 9; all the connecting rods 9 pass through the annular cavity 2001 and are slidably connected to the connecting tube 2; the lower parts of all the connecting rods 9 are fixedly connected to the movable ring 7; all the connecting rods 9 are located on the inner side of the blocking net 8.

[0030] It also includes a sealing sheet 14 ; a plurality of sealing sheets 14 distributed at equal distances are connected to the annular cavity 2001 ; each sealing sheet 14 corresponds to a diversion port 2003 .

[0031] The sealing sheet 14 is made of rubber.

[0032] The side of the sealing sheet 14 close to the filter screen 13 is fixedly connected to the bottom of the annular cavity 2001 .

[0033] A first sealing ring 2004 is screwed onto the upper portion of the connecting tube 2 .

[0034] The first sealing ring 2004 is provided with a plurality of anti-slip grooves in an annular array.

[0035] A grid is provided in an annular array on the protective base 3 to block aquatic plants and animals from entering the protective base 3 .

[0036] The working steps of the above embodiment are:

[0037] Before using the submersible pump, first connect the submersible pump body 1 to the water pipe, then hang the upper part of the submersible pump body 1 with a rope and lower it into the aquarium. When the submersible pump body 1 contacts the bottom of the aquarium, connect the submersible pump body 1 to the external power supply, control and start the submersible pump body 1, and the water in the aquarium enters the submersible pump body 1 through the protective base 3 and the connecting tube 2 in turn. The submersible pump body 1 pumps the water to the outside through the water pipe. A grille is provided on the protective base 3 to intercept the animals and plants in the aquarium to avoid accidental injury to the animals in the aquarium. The water in the aquarium passes through the grille of the protective base 3 and enters the position of the connecting tube 2. The screen 8 filters the water passing through. This is mainly because some animals in the aquarium need to lay bottom sand in it to adapt and survive, and the activities of the animals in the aquarium will cause the bottom sand to be lifted up, and the bottom sand will be drawn into the submersible pump body 1, causing the rotor of the submersible pump body 1 to wear, thereby generating vibration, noise and shortening the service life. The screen 8 is mainly set to intercept the lifted bottom sand and waste generated by the activities of animals in the aquarium, so as to achieve full protection for the submersible pump.

[0038] After running for a period of time, a large amount of impurities are intercepted on the screen 8, and the three first electric actuators 11 are controlled to contract, and the movable cylinder 12 is synchronously driven to move downward until the bottom of the movable cylinder 12 contacts the protective base 3. At this time, the submersible pump body 1 is still working, and the movable cylinder 12 releases the blockage of the filter 13, and the movable cylinder 12 blocks the screen 8. Therefore, after entering the protective base 3, water no longer directly enters the connecting cylinder 2, but enters the annular cavity 2001 through the diversion port 2003, and then enters the connecting cylinder 2 after passing through each filter screen 13. By changing the flow path of water, the problem of the screen 8 being blocked by impurities, which leads to a decrease in the pumping efficiency of the submersible pump body 1, is effectively avoided, and the water is converted through the waterway. Compared with the single-channel submersible pump, the maintenance frequency is significantly reduced. Manual maintenance is only required after the filter 13 is also blocked. At the same time, after changing the water flow path, the three second electric actuators 5 are controlled to contract, and the connecting rod 9 is synchronously driven to move upward. All the connecting rods 9 jointly drive the movable ring 7 to move upward, thereby driving the flexible screen 8 to deform. After the second electric actuator 5 reaches the contraction limit, the three second electric actuators 5 are controlled to extend, and the connecting rod 9 and the parts thereon are synchronously driven to move downward, so that the screen 8 is opened downward again. Therefore, by controlling the reciprocating extension and contraction of the second electric actuator 5, the expansion and contraction of the screen 8 is realized, and the impurities intercepted on the screen 8 are shaken off, completing the automatic cleaning of the screen 8.

[0039] At the same time, the diversion port 2003 is located outside the blocking net 8. When the water flows into the annular cavity 2001 through the diversion port 2003, the sealing sheet 14 flips up, and the impurities shaken off the blocking net 8 will enter the annular cavity 2001 with the water flow. Then, when the water flows into the connecting cylinder 2, the impurities in the water flow are intercepted by the filter screen 13. Then, since the blocking net 8 has completed self-cleaning, all the first electric actuators 11 can be controlled to extend, and the movable cylinder 12 can be synchronously driven to move upward until the movable cylinder 12 is reset. The movable cylinder 12 blocks all the filter screens 13, and the water in the annular cavity 2001 can no longer pass through the filter screen 13 to enter. In the connecting tube 2, the sealing piece 14 is reset at the same time, and each sealing piece 14 blocks the corresponding diversion port 2003. Since the side of the sealing piece 14 close to the filter screen 13 is fixed at the bottom of the annular cavity 2001, when the water flow no longer flows through the filter screen 13, the impurities intercepted on the filter screen 13 fall under the action of gravity, and the impurities will only fall on the sealing piece 14, which is convenient for centralized treatment of impurities in the later stage. After the cleaning of the blocking screen 8 is completed, the water flow passes through the blocking screen 8 again and enters the connecting tube 2, thereby further extending the trouble-free operation time of the submersible pump, and further reducing the frequency of manual maintenance, saving time and energy.

[0040] After the submersible pump has been running for a period of time, a large amount of impurities are also intercepted on the filter screen 13, causing the filter screen 13 to be blocked. At this time, the operator only needs to lift the submersible pump upwards, and then unscrew the bolts fixed to the submersible pump body 1 and the protective base 3 to separate the submersible pump body 1, the connecting tube 2 and the protective base 3. Then, by rotating the first sealing ring 2004 on the connecting tube 2, the first sealing ring 2004 is unscrewed from the connecting tube 2, and then the inside of the annular cavity 2001 and the filter screen 13 are rinsed with water. After cleaning, the first sealing ring 2004 is screwed back to the connecting tube 2, and the submersible pump body 1, the connecting tube 2 and the protective base 3 are reinstalled together and put into use again.

[0041] Second embodiment

[0042] On the basis of the first embodiment, according to Figure 1 、 Figure 2 、 Figure 6 and Figure 7As shown, it also includes a contact piece 15, a second sealing ring 16 and a limit rod 17; the protective base 3 is fixedly connected to the contact piece 15, and a cavity is opened inside the contact piece 15; a deformable annular capsule 1501 is provided on the contact piece 15, and the annular capsule 1501 is communicated with the cavity inside the contact piece 15; a ring-shaped drain port 1502 is provided on the contact piece 15, and the drain port 1502 is communicated with the cavity inside the contact piece 15; the drain port 1502 is located on the inner side of the annular capsule 1501; a diversion chamber 1201 is opened in the movable cylinder 12, and an opening is provided at the lower part of the diversion chamber 1201; the lower part of the diversion chamber 1201 cooperates with the drain port 1502; the movable cylinder 12 faces one side of the barrier 8 There are several water spray outlets 1202 on the side; the diversion cavity 1201 is connected to all the water spray outlets 1202; the contact member 15 is provided with several water inlets 1503 distributed in a circular array, and the water inlet 1503 is connected to the cavity inside the contact member 15; a one-way valve is provided in the water inlet 1503, and the one-way valve only allows the water in the connecting cylinder 2 to flow to the cavity inside the contact member 15; the drain outlet 1502 is slidably connected to the second sealing ring 16; the second sealing ring 16 is provided with several limiting grooves 1601 distributed in a circular array; several limiting rods 17 distributed in a circular array are fixedly connected to the drain outlet 1502; each limiting rod 17 is located in a limiting groove 1601.

[0043] A sealing strip is provided at the lower portion of the movable cylinder 12 to seal the contact position between the movable cylinder 12 and the contact member 15 .

[0044] The working steps of the above embodiment are:

[0045] On the basis of the first embodiment, it is difficult to completely clean the impurities on the screen 8 by simply deforming the screen 8, especially when the power of the submersible pump body 1 is large, the suction force on the water is stronger, causing the impurities to adhere more firmly to the screen 8. Simply deforming the screen 8 cannot fully remove them. At this time, a diverter chamber 1201 with a lower opening is opened in the movable cylinder 12. When the movable cylinder 12 is controlled to move downward, the diverter chamber 1201 is filled with water, and the lower end of the diverter chamber 1201 is inserted into the drain port 1502. A sealing strip is provided at the lower part of the movable cylinder 12. The movable cylinder 12 and the contact member 15 are in closer contact, and then when the control screen 8 is deformed, the movable ring 7 will reciprocate up and down. When the movable ring 7 moves downward, the movable ring 7 squeezes the annular capsule 1501, and the annular capsule 1501 is squeezed and deformed. The water in the cavity of the contact member 15 is squeezed out from the drain port 1502, and the second sealing ring 16 is pushed upward. The cooperation of the limiting groove 1601 and the limiting rod 17 prevents the second sealing ring 16 from completely leaving the position of the drain port 1502. The water squeezed out from the drain port 1502 passes through the drain port 1502. After the movable ring 7 is in contact with the contact member 15, the net 8 is in an open state, so the impurities remaining on the net 8 can be backwashed to reduce the residual impurities on the net 8. The size of the contact member 15 shown in the figure is only for reference. In actual use, after the movable ring 7 squeezes the contact member 15, the water in the diverter cavity 1201 is sprayed from each water outlet 1202 to the net 8. The water sprayed out by 1202 is sufficient to effectively backwash the screen 8. Then, when the movable ring 7 moves upward, the movable ring 7 separates from the contact piece 15, the annular bag 1501 is restored, the negative pressure in the contact piece 15, and the second sealing ring 16 moves downward to block the drain port 1502. At the same time, the one-way valves of all the water inlets 1503 are opened, and the water in the connecting tube 2 enters the cavity in the contact piece 15 through the water inlet 1503. Therefore, when the movable ring 7 squeezes the contact piece 15 again, the screen 8 can be continuously backwashed, effectively reducing the stubborn residual impurities in the screen 8.

[0046] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the embodiments of the present invention and should not be construed in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific implementations of the embodiments of the present invention without inventive effort, and such implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A submersible pump with a protective function, comprising a submersible pump body (1); the submersible pump body (1) is connected to a protective base (3); a connecting tube (2) is detachably connected between the submersible pump body (1) and the protective base (3); and the characteristics include: The connecting tube (2) is connected to a reciprocating unit; the connecting tube (2) is fixedly connected to a blocking net (8), which is a flexible net; the blocking net (8) is connected to the reciprocating unit; the reciprocating unit is used to drive the blocking net (8) to deform and clean the blocking net (8); the bottom of the blocking net (8) is connected to the protective base (3); an annular cavity (2001) is opened in the connecting tube (2); three first U-shaped plates (10) are fixedly connected in the annular cavity (2001); three first electric actuators (11) are installed in the connecting tube (2); each first electric actuator (11) corresponds to one first U-shaped plate (10); three straight-line sliding plates are opened in the annular cavity (2001); Groove (2002); all the telescopic parts of the first electric actuators (11) are fixedly connected to the movable cylinder (12) through a sliding rod, and each sliding rod slides in a straight sliding groove (2002); a plurality of diversion ports (2003) are opened at the lower part of the annular cavity (2001); the diversion ports (2003) are all located on the outside of the blocking net (8); the movable cylinder (12) is located on the inside of the blocking net (8); the movable cylinder (12) is slidably connected to the connecting cylinder (2); a plurality of filter screens (13) are installed in the annular cavity (2001); the movable cylinder (12) cooperates with all the filter screens (13), and the movable cylinder (12) is used to block all the filter screens (13); The reciprocating unit comprises a second U-shaped plate (4); three second U-shaped plates (4) are fixedly connected in the annular cavity (2001); a second electric actuator (5) is installed in each second U-shaped plate (4); a fixed ring (6) is fixedly connected to the upper part of the blocking net (8); a movable ring (7) is fixedly connected to the lower part of the blocking net (8); the fixed ring (6) is fixedly connected to the connecting tube (2); a connecting rod (9) is connected to the telescopic part of each second electric actuator (5); all the connecting rods (9) pass through the annular cavity (2001) and are slidably connected to the connecting tube (2); all the connecting rods (9) are fixedly connected to the movable ring (7); all the connecting rods (9) are located inside the blocking net (8); It also includes a plurality of sealing sheets (14) connected to the annular cavity (2001); each sealing sheet (14) corresponds to a diversion port (2003); A grid is provided in a circular array on the protective base (3); The invention also includes a contact member (15) fixed to the protective base (3), wherein a cavity is provided inside the contact member (15); a deformable annular capsule (1501) is provided on the contact member (15), and the annular capsule (1501) is communicated with the cavity inside the contact member (15); an annular drain port (1502) is provided on the contact member (15), and the drain port (1502) is communicated with the cavity inside the contact member (15); the drain port (1502) is located inside the annular capsule (1501); a diversion cavity (1201) is provided inside the movable cylinder (12), and an opening is provided at the lower part of the diversion cavity (1201); the diversion cavity (1201) cooperates with the drain port (1502); the movable cylinder (12) faces the barrier (8) A plurality of water spray ports (1202) are provided on one side; the diversion cavity (1201) is communicated with all the water spray ports (1202); a plurality of water inlets (1503) are provided on the contact member (15), and the water inlets (1503) are communicated with the inner cavity of the contact member (15); a one-way valve is provided in the water inlet (1503), and the one-way valve only allows water in the connecting cylinder (2) to flow into the inner cavity of the contact member (15); the drain port (1502) is slidably connected to a second sealing ring (16); the second sealing ring (16) is provided with a plurality of limiting grooves (1601); a plurality of limiting rods (17) are fixedly connected to the drain port (1502); each limiting rod (17) is located in a limiting groove (1601).

2. A submersible pump with a protective function according to claim 1, characterized in that: The sealing sheet (14) is made of rubber.

3. A submersible pump with a protective function according to claim 2, characterized in that: The side of the sealing sheet (14) close to the filter screen (13) is fixedly connected to the bottom of the annular cavity (2001).

4. A submersible pump with a protective function according to claim 3, characterized in that: The connecting cylinder (2) is screwed with a first sealing ring (2004), and the first sealing ring (2004) is used to seal the annular cavity (2001).

5. A submersible pump with a protective function according to claim 4, characterized in that: The first sealing ring (2004) is provided with a plurality of anti-slip grooves in an annular array, so as to facilitate removal of the first sealing ring (2004) from the annular cavity (2001).

6. The submersible pump with protective function according to claim 1, characterized in that: A sealing strip is provided at the lower portion of the movable cylinder (12).

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