Small submersible pump

Abstract

The invention discloses a small submersible electric pump, comprising a water pump casing fixed with a water outlet, a power line outlet and a handle, a motor, a water pump impeller, a guide shell and a water inlet bottom cover, a water passage between the motor side and the water pump casing, the water inlet bottom cover and the guide shell are connected together with the motor lower end cover by bottom cover bolts, a rubber sealing ring is provided between the upper end cover of the motor and the motor casing, the upper end cover is provided with a power line sealing fixing device and a sealing test hole, a connecting flange with two bolt holes is provided at the edge of the upper end cover port, a corresponding fixing code with two fixing screw holes is fixed on the side of the motor casing, the connection between the upper end cover and the motor casing and the connection between the motor and the top end of the water pump casing are connected together at different pairs of bolt holes and fixing screw holes by fixing bolts and long bolts respectively, the power line sealing fixing device extends from the power line outlet and is sealed by the sealing ring, so that water is prevented from entering the inside of the motor; the invention has the beneficial effects of improving the connection fixing sealing effect between the motor and the water pump casing and the power line fixing sealing effect and preventing sealing failure.

Description

Technical Field

[0001] The invention relates to a small submersible electric pump used for drainage, irrigation and aquaculture water circulation. Background Art

[0002] In the prior art, the main structure of a small submersible electric pump includes a water pump casing, a motor and a water pump impeller installed therein, a guide shell and a water inlet bottom cover, wherein the upper end of the water pump casing is provided with a water outlet, a power cord outlet and a handle, the upper end of the motor is extended from the upper end of the water pump casing to the bearing seat in the upper end cover of the motor by a long bolt and is tightly fixed to the top of the water pump casing, the motor output shaft is connected to the water pump impeller at the lower end, there is a water passage between the motor side and the water pump casing, the water inlet bottom cover and the guide shell are sealed and connected with the lower end cover of the motor by the bottom cover bolts, the motor power lead wire is connected with a rubber sheath and then led out from the power cord outlet, the rubber sheath is pressed by the upper end cover of the motor to the top of the water pump casing and sealed, if there is a float water level switch, the float water level switch lead wire is also connected with a rubber sheath and then led out from another power cord outlet, the rubber sheath is also pressed by the upper end cover of the motor to the top of the water pump casing and sealed. After the small submersible pump is submerged in the water, the water is sucked into the water inlet bottom cover by the motor-driven water pump impeller, flows through the guide shell to the water passage, and then is discharged from the water outlet at the upper end of the water pump housing. The biggest problem with this small submersible pump is insufficient sealing, mainly because the top of the water pump housing and the upper end of the motor are connected and fixed at the position where they are sealed by the rubber sealing ring on the long bolts. The motor power lead wire and the float water level switch lead wire are sealed at the top of the water pump housing by the rubber wire sheath and are fastened by the upper end cover of the motor with several fastening screws. These seals are maintained by the fastening force of several fastening screws. However, during mass production, if the fastening of these fastening screws is unbalanced, it will cause unbalanced sealing pressure, which is easy to cause loose sealing effect, resulting in long-term use. At the same time, when the rubber sealing ring or rubber grommet loses its elasticity due to aging and under the reaction of the motor's gravity, the sealing pressure is reduced or even loosens and fails. In addition, in daily use, the power lead is often used to lift the water pump, or the float water level switch constantly rises and falls and bends the lead, which may cause the rubber grommet to be damaged. Under external water pressure, water will enter the motor from the rubber sealing ring or rubber grommet, which may easily cause motor failure. Therefore, in order to ensure the sealing effect and extend the product life, further improvements are needed in the sealing structure and prevention of sealing failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a small submersible electric pump which can improve the fixing seal effect of the connection between the motor and the water pump housing and the fixing seal effect of the power line and can prevent the seal from failing.

[0004] In order to solve the above technical problems, the technical solution of the small submersible electric pump of the present invention is: it includes a water pump housing and a motor and a water pump impeller installed therein, a guide shell and a water inlet bottom cover, wherein the upper end of the water pump housing has a water outlet, a power line outlet and a handle, the upper end of the motor is fixed to the top of the water pump housing, the motor output shaft is connected to the water pump impeller at the lower end, there is a water passage between the motor side and the water pump housing, the water inlet bottom cover and the guide shell are sealed and connected with the lower end cover of the motor by bottom cover bolts, the upper end of the motor has an upper end cover that is sealed and embedded with the motor housing, a rubber sealing ring is provided between the upper end cover and the motor housing, and a power line sealing fixing device and a sealing measuring device are sealed and fixed to the end face of the upper end cover. The test hole is characterized in that: the edge of the upper end cover port is provided with a plurality of connecting flanges evenly distributed on the circumference, a fixing code corresponding to the position and quantity of the connecting flange is fixed on the side of the motor housing, the connecting flange is provided with two bolt holes, the fixing code is provided with two fixing screw holes corresponding to the positions of the bolt holes one by one, the upper end cover and the motor housing are fixed together by fixing bolts to connect the connecting flange and one of the bolt holes and the fixing screw hole of the fixing code, and the other bolt hole and the fixing screw hole of the connecting flange and the fixing code are connected together by long bolts extending from the top of the water pump housing, the upper end of the motor is fixed to the top of the water pump housing, and the power cord sealing fixing device extends from the power cord outlet and is sealed by a sealing ring.

[0005] As one of the preferred technical schemes of the present invention, the power cord sealing and fixing device includes a sealing nut and a sealing bolt and a rubber grommet which are sealed and fixed to the end face of the upper end cover, wherein the bottom of the central screw hole of the sealing nut has a conical sealing surface, the rubber grommet is in the shape of a hollow arrow, the arrowhead is a conical sealing head which cooperates with the conical sealing surface, the arrow handle is a conical sealing column, the sealing bolt has a conical center hole which cooperates with the outer surface of the conical sealing column, the rubber grommet is placed in the sealing nut, the conical sealing head cooperates with the conical sealing surface, the conical center hole of the sealing bolt is sleeved on the conical sealing column and tightened in the sealing nut, so that the end of the sealing bolt and the conical center hole respectively press the bottom end face of the conical sealing head and the outer surface of the conical sealing column, and the rubber grommet is compressed to clamp and seal the power lead.

[0006] As a second preferred technical solution of the present invention, a protective gasket is further arranged between the end of the sealing bolt and the bottom end surface of the conical sealing head.

[0007] As the third preferred technical solution of the present invention, there are two power cord sealing and fixing devices, which respectively fix the power lead wire and the float water level switch lead wire, and there are also two power cord outlets, and the two power cord sealing and fixing devices extend from the two power cord outlets respectively.

[0008] As a fourth preferred technical solution of the present invention, a power cord lead-out wire clamp is fixed on the side of the handle.

[0009] As a fifth preferred technical solution of the present invention, a float water level switch lead-out wire clamp is fixed on the side of the handle.

[0010] As the sixth preferred technical solution of the present invention, the lead-out wire clamp of the float water level switch is a rotary clamp, comprising two symmetrical clamp arms, one end of the two clamp arms is fixed on the handle, and the other end has an engaging clamping mouth, and the two clamp arms are engaged and connected together by bolts and nuts arranged at the waist of the clamp arms so that the engaging clamping mouth clamps the lead-out wire of the float water level switch, and also comprises a pin mounted on the handle and capable of being movably rotated, and the lead-out wire clamp of the float water level switch is movably connected to the side of the handle by the two clamp arms jointly clamping the tail end of the pin.

[0011] As the seventh preferred technical solution of the present invention, there is an annular groove at the tail position of the pin, and the two clamp arms are symmetrically separated, each clamp arm is composed of a rectangular arm portion and an arc-shaped clamp portion, wherein one side of the rectangular arm portion has a semi-cylindrical shaft hole, and the middle part of the inner wall of the semi-cylindrical shaft hole has a semi-annular flange, and the bolts and nuts are connected to the position of the rectangular arm portion near the arc-shaped clamp portion. When the two clamp arms are combined together, the two semi-cylindrical shaft holes embrace the tail of the pin, and the two semi-annular flanges are combined together and embedded in the annular groove. There is a gap between the embracing ends of the two arc-shaped clamp portions to form an open embracing wire clamp mouth.

[0012] An eighth preferred technical solution of the present invention is that the connecting portion between the arc-shaped clamping portion of the clamping arm and the rectangular parallelepiped arm portion is elastic.

[0013] The beneficial effect of the present invention is that the upper end of the motor in the present invention is no longer extended from the upper end of the water pump housing to the bearing seat in the upper end cover of the motor and fastened to the top of the water pump housing by a long bolt, but the connecting flange set at the edge of the port of the upper end cover of the motor is connected and fixed together with a fixing code fixed to the side of the motor housing by a fixing bolt, and then another long bolt is extended from the top of the water pump housing and connected to the connecting flange and the fixing code to lift the entire motor and press it against the top of the water pump housing for fixing, so that even if the bolt hole at the top of the water pump housing leaks, it can prevent water from entering the inside of the motor; at the same time, the power cord sealing and fixing device sealed and fixed on the upper end cover is further improved, and the sealing nut, sealing bolt and rubber grommet are used together with the conical sealing surface to make the rubber grommet press, seal and fix the power lead wire and the float water level switch lead wire, thereby increasing the sealing area and strengthening the protection of the power lead wire and the root of the float water level switch lead wire, and at the same time, the power cord sealing and fixing device is from the power cord The outlet is extended and sealed by a sealing ring, which greatly reduces the chance of water entering the motor from the power cord outlet position, and also greatly reduces the chance of damage to the roots of the power lead wire and the float water level switch lead wire. In addition, a power cord lead wire clamp is provided on the handle on the water pump housing to clamp and fix the power lead wire, reducing the chance of the power lead wire being pulled and directly damaging the root of the power lead wire to cause leakage and short circuit. When the water pump is equipped with a float water level switch, it is also sealed and fixed by a power cord sealing and fixing device. At the same time, a float water level switch lead wire clamp is further provided on the handle on the water pump housing to clamp and fix the float water level switch lead wire. Moreover, since the float moves up and down with the rise and fall of the water level, the float water level switch lead wire clamp is improved to a rotatable clamp, which greatly reduces the chance of leakage and short circuit caused by fatigue damage of the float water level switch lead wire. Therefore, the present invention has the beneficial effects of improving the connection and fixing seal between the motor and the water pump housing and the power cord fixing and preventing sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The small submersible electric pump of the present invention will be described in more detail below with reference to the accompanying drawings.

[0015] Figure 1 It is a cross-sectional view of a small submersible electric pump of the present invention.

[0016] Figure 2 yes Figure 1 Top view of the .

[0017] Figure 3 It is a cross-sectional view of the upper end cover of the motor in the small submersible electric pump of the present invention.

[0018] Figure 4 yes Figure 3 Left view of .

[0019] Figure 5It is a cross-sectional view of the motor housing in the small submersible electric pump of the present invention.

[0020] Figure 6 yes Figure 5 Top view of the .

[0021] Figure 7 It is a cross-sectional view of a water pump housing in a small submersible electric pump of the present invention.

[0022] Figure 8 yes Figure 7 Top view of the .

[0023] Fig. 9 The invention discloses a cross-sectional view of a sealing nut of a power line sealing and fixing device in a small submersible electric pump.

[0024] Fig.10 The invention discloses a cross-sectional view of a sealing bolt of a power line sealing and fixing device in a small submersible electric pump.

[0025] Fig.11 yes Fig.10 Top view of the .

[0026] Fig.12 The present invention is a cross-sectional view of a rubber wire sheath of a power line sealing and fixing device in a small submersible electric pump.

[0027] Fig.13 The present invention is a structural cross-sectional view of a power line sealing and fixing device in a small submersible electric pump fixed on an upper end cover of a motor.

[0028] Fig.14 yes Figure 1 A magnified view of the part in the middle.

[0029] Fig.15 yes Figure 2 A magnified view of the part B in the middle.

[0030] Fig.16 The invention discloses a structural diagram of a lead-out wire clamp of a float water level switch in a small submersible electric pump.

[0031] Fig.17 yes Fig.16 Top view of the .

[0032] Fig.18 yes Fig.16 Bottom view of .

[0033] Fig.19 yes Fig.16 Left view of .

[0034] Fig. 20 yes Fig.16 Right view of .

[0035] Fig.21 yes Fig.16 Front stereoscopic view of .

[0036] Fig. 22 yes Fig.16 Reverse stereoscopic view of .

[0037] Fig.23 yes Fig.16 sectional view of .

[0038] Fig.24 The invention is a structural cross-sectional view of a float water level switch lead-out wire clamp in a small submersible electric pump when the float water level switch lead-out wire clamp is installed on a handle to clamp the float water level switch lead-out wire.

[0039] Fig.25 The invention discloses a clamp arm structure diagram of a lead-out wire clamp of a float water level switch in a small submersible electric pump.

[0040] Fig.26 yes Fig.25 CC section view.

[0041] Fig. 27 yes Fig.25 Top view of the .

[0042] Fig.28 The present invention discloses a pin structure diagram of a lead-out wire clamp of a float water level switch in a small submersible electric pump.

[0043] Fig.29 It is a reference diagram of the state in which the float falls when the lead-out wire clamp of the float water level switch in the small submersible electric pump of the present invention is installed on the handle to clamp the lead-out wire of the float water level switch.

[0044] Fig.30 It is a reference diagram of the state in which the float ball rises when the lead-out wire clamp of the float ball water level switch in the small submersible electric pump of the present invention is installed on the handle to clamp the lead-out wire of the float ball water level switch.

[0045] As shown in the figure: water pump housing 1, water outlet 11, power cord outlet 12, sealing ring 121, handle 13, float 14, motor 2, motor housing 21, upper end cover 22, rubber sealing ring 23, power cord sealing fixture 24, sealing nut 241, sealing bolt 242, rubber wire sheath 243, protective gasket 244, conical sealing surface 245, conical sealing head 246, conical sealing column 247, conical center hole 248, connecting flange 25, bolt hole 2 51, fixing code 26, fixing screw hole 261, sealing test hole 27, water pump impeller 3, guide shell 4, water inlet bottom cover 5, water passage 6, power lead 7, float water level switch lead 8, power lead clamp code 9, float water level switch lead clamp code 10, clamp arm 101, clamping wire mouth 102, bolt 103, nut 104, pin 105, annular groove 106, rectangular arm 107, arc clamp 108, semi-cylindrical shaft hole 109, semi-ring flange 110. DETAILED DESCRIPTION

[0046] Depend on Figures 1 to 14As shown, the embodiment of the small submersible electric pump of the present invention is: it includes a water pump housing 1 and a motor 2 and a water pump impeller 3 installed therein, a guide shell 4 and a water inlet bottom cover 5, wherein the upper end of the water pump housing 1 has a water outlet 11, a power line outlet 12 and a handle 13, the upper end of the motor 2 is fixed to the top of the water pump housing 1, the motor output shaft is connected to the water pump impeller 3 at the lower end, and there is a water passage 6 between the motor 2 side and the water pump housing 1, the water inlet bottom cover 5 and the guide shell 4 are sealed and connected with the lower end cover of the motor 2 by bottom cover bolts, the upper end of the motor 2 has an upper end cover 22 that is sealed and embedded with the motor housing 21, and a rubber sealing ring 23 is provided between the upper end cover 22 and the motor housing 21, and a power line sealing fixture 24 and a sealing test hole 27 are sealed and fixed to the end face of the upper end cover 22, and the upper end cover 22 port The edge has a plurality of connecting flanges 25 evenly distributed around the circumference, and a fixing code 26 corresponding to the position and number of the connecting flange 25 is fixed on the side of the motor housing 21. The connecting flange 25 has two bolt holes 251, and the fixing code 26 has two fixing screw holes 261 corresponding to the positions of the bolt holes 251. The upper end cover 22 and the motor housing 21 are fixed together by fixing bolts to connect the connecting flange 25 and one of the bolt holes 251 and the fixing screw hole 261 of the fixing code 26, and the other bolt hole 251 and the fixing screw hole 261 of the connecting flange 25 and the fixing code 26 are connected together by long bolts extending from the top of the water pump housing 1, so that the upper end of the motor 2 is fixed to the top of the water pump housing 1, and the power cord sealing fixture 24 extends from the power cord outlet 12 and is sealed by the sealing ring 121. In this embodiment, the water outlet 11 and the handle 13 are welded on the water pump housing 1, the upper end cover 22 is stamped, and a connecting flange 25 extends from the edge of its port. The number of connecting flanges 25 can be three or more, so as to be able to tighten and seal. The fixing code 26 is welded to the side of the motor housing 21, and the long bolts extending from the top of the water pump housing 1 and connected to the connecting flange 25 and the fixing code 26 are sealed with sealing washers on the bolt heads. The water pump housing 1, the water outlet 11, the handle 13, the motor housing 21, the upper end cover 22, the fixing code 26, the water inlet bottom cover 5, etc. can all be made of stainless steel materials, which have anti-corrosion and aesthetic effects.

[0047] Depend on Figures 1 to 4 , Figures 9 to 14As shown, as one of the preferred embodiments of the present invention: the power cord sealing and fixing device 24 includes a sealing nut 241 and a sealing bolt 242 and a rubber grommet 243 which are sealed and fixed to the end face of the upper end cover 22, wherein the bottom of the central screw hole of the sealing nut 241 has a conical sealing surface 245, the rubber grommet 243 is in a hollow arrow shape, the arrow is a conical sealing head 246, which cooperates with the conical sealing surface 245, the arrow handle is a conical sealing column 247, the sealing bolt 242 has a conical sealing surface 245 which is in the shape of a conical sealing head 246, and the conical sealing surface 245 is matched with the conical sealing surface 245. The arrow handle is a conical sealing column 247, and the sealing bolt 242 has a conical sealing surface 245 which is matched with the conical sealing column 245. The conical center hole 248 of the sealing bolt 242 is fitted on the conical sealing column 247 and screwed into the sealing nut 241, so that the end of the sealing bolt 242 and the conical center hole 248 respectively press the bottom end surface of the conical sealing head 246 and the outer surface of the conical sealing column 247, and the rubber grommet 243 is compressed to clamp and seal the power lead wire. In this embodiment, the sealing nut 241 is sealed and welded on the end surface of the upper end cover 22, the center hole diameter of the rubber grommet 243 is transitionally matched with the outer diameter of the power line, and the sealing nut 241 and the sealing bolt 242 can be made of stainless steel.

[0048] Depend on Figure 1 , 13 As shown in Figures 14 to 15, as a second preferred embodiment of the present invention, a protective washer 244 is further provided between the end of the sealing bolt 242 and the bottom end surface of the conical sealing head 246. In this embodiment, the protective washer 244 can be a metal or plastic washer to prevent the sealing bolt 242 from damaging the bottom end surface of the conical sealing head 246 when it is screwed and tightened.

[0049] Depend on Figures 1 to 4 , 8, 13-14, as the third preferred embodiment of the present invention, there are two power cord sealing and fixing devices 24, which respectively fix the power lead wire 7 and the float water level switch lead wire 8, and there are also two power cord outlets 12, and the two power cord sealing and fixing devices 24 extend from the two power cord outlets 12 respectively. In this embodiment, the two power cord sealing and fixing devices 24 are arranged at two symmetrical positions, as close as possible to the two sides of the handle 13, so as to facilitate the lead wires to be fixed on the two sides of the handle 13.

[0050] Depend on Figure 2As shown, as a fourth preferred embodiment of the present invention, a power lead-out wire clamp 9 is fixed on the side of the handle 13. In this embodiment, the power lead-out wire clamp 9 uses two fixing plates with bolts and nuts at the waist, clamping the side of the handle 13 on one side and the power lead-out wire on the other side. A notch can be opened on the side of the handle 13 to be clamped and positioned by the power lead-out wire clamp 9. The two fixing plates of the power lead-out wire clamp 9 can have a semicircular clamping opening on one side of the power lead-out wire to clamp the power lead-out wire package.

[0051] Depend on Figure 2 , 15 As shown in Figure 30, as the fifth preferred embodiment of the present invention, a float water level switch lead-out wire clamp 10 is fixed on the side of the handle 13. In this embodiment, the float water level switch lead-out wire clamp 10 can be made of two fixed plates with bolts and nuts at the waist, one side clamps the side of the handle 13, and the other side clamps the float water level switch lead-out wire. A notch can be opened on the side of the handle 13 to be clamped and positioned by the power line lead-out wire clamp 9. The two fixed plates of the power line lead-out wire clamp 9 can have a semicircular clamping opening on one side of the float water level switch lead-out wire to clamp the float water level switch lead-out wire package. A rotary clamp can also be used.

[0052] Depend on Figure 2 , 15 As shown in Figures 1 to 30, as the sixth preferred embodiment of the present invention, the lead-out wire clamp 10 of the float water level switch is a rotary clamp, including two symmetrical clamp arms 101, one end of the two clamp arms 101 is fixed on the handle 13, and the other end has an embracing clamp mouth 102. The two clamp arms 101 are embracingly connected together by bolts 103 and nuts 104 set at the waist of the clamp arms 101 so that the embracing clamp mouth 102 clamps the lead-out wire 8 of the float water level switch, and also includes a pin 105 installed on the handle 13 and capable of being movably rotated. The lead-out wire clamp 10 of the float water level switch is movably connected to the side of the handle 13 by the two clamp arms 101 jointly clamping the tail end of the pin 105. In this embodiment, as Fig.23 , 24 As shown in FIG. 29, a pin hole is opened in the handle 13, and the pin 105 passes through the pin hole in a clearance fit manner, and then the two clamp arms 101 are connected together by the tail ends of the pin 105 by the bolt 103 and the nut 104 set at the waist of the clamp arm 101, as shown in FIG. Figures 29-30As shown, the float water level switch lead wire clamp 10 can be rotatable with the pin 15, and can be pulled by the float water level switch lead wire 8 to rotate and swing as the float 14 water level switch rises and falls; the present invention adds a degree of freedom to the movable joint of the float water level switch lead wire 8 to play an auxiliary role, so that the bending amplitude required for the float 14 water level switch to operate at the position close to the fixed position is greatly reduced, even if the float water level switch lead wire 8 is immersed in water for a long time, causing the insulating plastic outer skin to age and harden, the float wire clamp can be used to rotate and swing to compensate to achieve the necessary bending amplitude for the float 14 water level switch to operate, which greatly reduces the failure of the float 14 water level switch not operating due to inadequate lifting and lowering, effectively prevents the float 14 water level switch from failing, and also reduces fatigue damage to the float water level switch lead wire 8, preventing water from leaking into the motor.

[0053] Depend on Figures 23 to 28 As shown, as the seventh preferred embodiment of the present invention, the tail position of the pin 105 is provided with an annular groove 106, the two clamping arms 101 are symmetrically separated, each clamping arm 101 is composed of a rectangular arm portion 107 and an arc-shaped clamping portion 108, wherein one side of the rectangular arm portion 107 is provided with a semi-cylindrical shaft hole 109, and the middle part of the inner wall of the semi-cylindrical shaft hole 109 is provided with a semi-annular flange 110, the bolt 103 and the nut 104 are connected to the position of the rectangular arm portion 107 near the arc-shaped clamping portion 108, when the two clamping arms 101 are combined together, the two semi-cylindrical shaft holes 109 embrace the tail of the pin 105, the two semi-annular flanges 110 are combined together and embedded in the annular groove 106, and there is a gap between the embracing ends of the two arc-shaped clamping portions 108 to form an open embracing wire clamping mouth 102. In this embodiment, the two clamp arms 101 are symmetrical to each other, and have the same structure and size. A single clamp arm can be manufactured by injection molding. The fit between the two semi-cylindrical shaft holes 109 combined complete shaft holes and the tail diameter of the pin 105 can be a transition fit, preferably a clearance fit. The thickness of the semi-annular flange 110 and the width of the annular groove 106 can be a transition fit or a clearance fit, preferably a clearance fit. This can make the assembled float water level switch lead-out wire clamp 10 more flexible. The engaging clamp mouth 102 is an engaging clamp mouth 102 with an arc-shaped clamp 108 to form an opening. If it is necessary to adjust the length of the float water level switch lead-out wire 8, it can be operated without loosening the bolt 103 and the nut 104. The float water level switch lead-out wire 8 can be adjusted by pulling down. The float water level switch lead-out wire clamp 10 automatically maintains a clamped state, which is very convenient.

[0054] Depend on Figures 25-27As shown, as an eighth preferred embodiment of the present invention, the connection part between the arc-shaped clamping part 108 of the clamping arm 101 and the rectangular parallelepiped arm 107 is elastic. In this embodiment, the purpose is to make the clamping wire mouth 102 formed by the arc-shaped clamping part 108 elastic, so as to facilitate clamping the float water level switch lead wire 8 and to make it easier to adjust the length of the float water level switch lead wire 8 as needed. When the injection molding process is selected for manufacturing, the connection part between the arc-shaped clamping part 108 and the rectangular parallelepiped arm 107 can also be gradually thinned or narrowed to increase the deformation and elasticity of this part.

[0055] In the present invention, the upper end of the motor 2 is no longer extended from the upper end of the water pump housing 1 to the bearing seat in the upper end cover 22 of the motor and fixed to the top of the water pump housing 1 by a long bolt. Instead, the connecting flange 25 provided at the edge of the port of the upper end cover 22 of the motor and the fixing code 26 fixed to the side of the motor housing 21 are connected together and fixed separately by a fixing bolt, and then another long bolt is extended from the top of the water pump housing 1 and connected to the connecting flange 25 and the fixing code 26 to lift the entire motor 1 and press it against the top of the water pump housing 1 to fix it. In this way, even if the water pump housing 1 The bolt hole at the top leaks, which can also prevent water from entering the motor. At the same time, the power cord sealing fixture 24 sealed and fixed on the upper end cover 22 is further improved, and the sealing nut 241, the sealing bolt 242 and the rubber grommet 243 are used together with the conical sealing surface to make the rubber grommet 243 press and seal and fix the power lead wire 7 and the float water level switch lead wire 8, thereby increasing the sealing area and strengthening the protection of the root of the power lead wire 7 and the float water level switch lead wire 8. At the same time, the power cord sealing fixture 24 is sealed from the power cord. The power line outlet 12 is extended and sealed by the sealing ring 121, which greatly reduces the chance of water entering the motor from the power line outlet position, and also greatly reduces the chance of the power lead wire 7 and the float water level switch lead wire 8 being damaged. In addition, a power line lead wire clamp 9 is also provided on the handle 13 on the water pump housing 1 to clamp and fix the power line 7, reducing the chance of the power line 7 being pulled and directly damaging the root of the power line 7 to cause leakage and short circuit. When the water pump is equipped with a float 14 water level switch, it is also fixed by the power line sealing device. At the same time, a float water level switch lead wire clamp 10 is provided on the handle 13 on the water pump housing 1 to clamp and fix the float water level switch lead wire 8. Moreover, since the float 14 moves up and down with the rise and fall of the water level, the float water level switch lead wire clamp 10 is improved into a rotatable clamp, which greatly reduces the chance of water leakage and short circuit caused by fatigue damage of the float water level switch lead wire 8. Therefore, the present invention has the beneficial effects of improving the fixed sealing effect of the connection between the motor and the water pump housing and the fixed sealing effect of the power line and preventing sealing failure.

[0056] The above description is only a preferred embodiment of the present invention and does not constitute a limitation on the protection scope of the present invention. As long as the purpose of the present invention is implemented by basically the same means, it should fall within the protection scope of the present invention.

Claims

1. A small submersible electric pump, comprising a water pump housing (1), a motor (2) and a water pump impeller (3) installed therein, a guide shell (4) and a water inlet bottom cover (5), wherein the upper end of the water pump housing (1) has a water outlet (11), a power line outlet (12) and a handle (13), the upper end of the motor (2) is fixed to the top of the water pump housing (1), the motor output shaft is connected to the water pump impeller (3) at the lower end, and there is water between the motor (2) side and the water pump housing (1) The channel (6), the water inlet bottom cover (5) and the guide shell (4) are sealed and connected with the lower end cover of the motor (2) by bottom cover bolts. The upper end of the motor (2) has an upper end cover (22) which is sealed and embedded with the motor housing (21). A rubber sealing ring (23) is provided between the upper end cover (22) and the motor housing (21). The end surface of the upper end cover (22) is sealed and fixed with a power line sealing fixing device (24) and a sealing test hole (27). The invention is characterized in that: The upper end cover (22) has a plurality of connection flanges (25) evenly distributed around the circumference at the port edge, a fixing code (26) corresponding to the position and number of the connection flanges (25) is fixed to the side of the motor housing (21), the connection flange (25) has two bolt holes (251), the fixing code (26) has two fixing screw holes (261) corresponding to the positions of the bolt holes (251) one by one, the upper end cover (22) and the motor housing (21) are connected by fixing bolts to the connection flange (25). ) and one of the bolt holes (251) and the fixing screw hole (261) of the connecting flange (25) and the fixing screw hole (261) are connected and fixed together, and the other bolt hole (251) and the fixing screw hole (261) of the connecting flange (25) and the fixing screw hole (261) are connected together by a long bolt extending from the top of the water pump housing (1), so that the upper end of the motor (2) is fixed to the top of the water pump housing (1), and the power line sealing fixture (24) extends from the power line outlet (12) and is sealed by the sealing ring (121).

2. The small submersible electric pump according to claim 1, characterized in that: The power cord sealing and fixing device (24) comprises a sealing nut (241) and a sealing bolt (242) and a rubber wire sheath (243) which are sealed and fixed to the end surface of the upper end cover (22), wherein the bottom of the central screw hole of the sealing nut (241) has a conical sealing surface (245), the rubber wire sheath (243) is in the shape of a hollow arrow, the arrow head is a conical sealing head (246) which cooperates with the conical sealing surface (245), the arrow handle is a conical sealing column (247), and the sealing bolt (242) has a conical sealing surface (245) which cooperates with the outer surface of the conical sealing column (247). The conical center hole (248) is formed in the sealing nut (241), the rubber wire sheath (243) is placed in the sealing nut (241), the conical sealing head (246) cooperates with the conical sealing surface (245), the conical center hole (248) of the sealing bolt (242) is sleeved on the conical sealing column (247), and is tightened in the sealing nut (241), so that the end of the sealing bolt (242) and the conical center hole (248) respectively press the bottom end surface of the conical sealing head (246) and the outer surface of the conical sealing column (247), and the rubber wire sheath (243) is compressed to clamp and seal the power lead wire.

3. The small submersible electric pump according to claim 2, characterized in that: A protective gasket (244) is also provided between the end of the sealing bolt (242) and the bottom end surface of the conical sealing head (246).

4. The small submersible electric pump according to claim 1 or 2, characterized in that: There are two power cord sealing and fixing devices (24), which respectively fix the power lead wire (7) and the float water level switch lead wire (8). There are also two power cord outlets (12), and the two power cord sealing and fixing devices (24) extend from the two power cord outlets (12) respectively.

5. The small submersible electric pump according to claim 1, characterized in that: A power line lead-out clamp (9) is fixed on the side of the handle (13).

6. The small submersible electric pump according to claim 1, characterized in that: A float water level switch lead-out wire clamp (10) is fixed on the side of the handle (13).

7. The small submersible electric pump according to claim 6, characterized in that: The lead-out wire clamp (10) of the float water level switch is a rotary clamp, comprising two symmetrical clamp arms (101), one end of the two clamp arms (101) being fixed on the handle (13), and the other end of the two clamp arms (101) being provided with an embracing wire clamping mouth (102), and the two clamp arms (101) being embracingly connected together by bolts (103) and nuts (104) arranged at the waist of the clamp arms (101) so that the embracing wire clamping mouth (102) clamps the lead-out wire (8) of the float water level switch, and further comprising a pin (105) mounted on the handle (13) and capable of being movably rotated, wherein the lead-out wire clamp (10) of the float water level switch is movably connected to the side of the handle (13) by the two clamp arms (101) jointly clamping the tail end of the pin (105).

8. The small submersible electric pump according to claim 7, characterized in that: The tail of the pin (105) is provided with an annular groove (106). The two clamping arms (101) are symmetrically separated. Each clamping arm (101) is composed of a rectangular arm portion (107) and an arc-shaped clamping portion (108). One side of the rectangular arm portion (107) is provided with a semi-cylindrical shaft hole (109). The middle part of the inner wall of the semi-cylindrical shaft hole (109) is provided with a semi-circular flange (110). The bolt (103) and the nut (104) are connected to the position of the rectangular arm portion (107) near the arc-shaped clamping portion (108). When the two clamping arms (101) are combined together, the two semi-cylindrical shaft holes (109) embrace the tail of the pin (105), and the two semi-circular flanges (110) are combined together and embedded in the annular groove (106). There is a gap between the embracing ends of the two arc-shaped clamping portions (108), forming an open embracing wire clamping mouth (102).

9. The small submersible electric pump according to claim 7, characterized in that: The connection portion between the arc-shaped clamping portion (108) of the clamping arm (101) and the rectangular parallelepiped arm portion (107) is elastic.

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