Miniature impeller submersible pump

Abstract

A miniature impeller submersible pump comprises a pump body, a filter cover, a motor, a closed impeller, a check valve and a blanking cap. A water inlet cavity is formed between the filter cover and the pump body; a water passing cavity is formed in the pump body; a water passing part protruding downwards is arranged at the bottom of the pump body, and an annular space is formed between the outer wall of the water passing part and the side wall of the water inlet cavity; a water outlet part is arranged at the top of the pump body; a water passing opening is formed in the water passing part and communicates with the water inlet cavity and the water passing cavity; a non-return channel is arranged in the water outlet part, and a non-return valve is mounted in the non-return channel; a motor is mounted in the pump body; a power output end of the motor is in transmission connection with the closed impeller; and the blanking cap covers and blocks the annular space. Therefore, the closed impeller is arranged to improve the pressure of the water pump, and normal work of the submersible pump is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps, in particular to a micro impeller submersible pump. Background Art

[0002] At present, existing RVs are equipped with water supply tanks for containing domestic water. Since the water in the water supply tank needs to be supplied to multiple places in the RV (such as toilets, water heaters, sinks, etc.), the water in the water supply tank is generally pumped to the water points of the RV through a submersible pump.

[0003] The existing submersible pumps for RVs are small in size, so that the submersible pumps can be placed in the water supply tank; and the small submersible pumps can only be equipped with small motors, and the submersible pumps with small motors are difficult to meet the water pressure requirements of RVs. Therefore, the applicant has previously applied for a Chinese patent announcement number CN219220754U to disclose a micro submersible pump for vehicles. The scheme adopts a closed impeller structure, which can effectively increase the water flow pressure of the water pump. However, in the scheme, when the impeller in the pump body is working, it is easy to inhale air and cause air entrapment, which causes the water pump to fail to work normally.

[0004] Moreover, in the prior art, the operation and stop of the water pump is usually controlled by a power switch. Specifically, the water pump is installed in a water tank and connected to an external drain port, and a water pump switch is connected between the water pump and the power supply. When drainage is required, the drain valve of the water pump is opened, the water pump switch is turned on, and the water pump works to drain water. When drainage is not required, the water pump switch is turned off and the water pump stops working. However, this solution has the following shortcomings: 1. It is easy to only close the drain valve and forget to turn off the water pump switch; 2. When the water pump switch is forgotten to be turned off, it is easy to cause the water pump to burn out; 3. The operation is inconvenient, and each time drainage needs to open the water pump switch and the drain valve at the same time. Utility Model Content

[0005] The utility model aims to provide a micro impeller submersible pump, which can mainly solve the problem that the above-mentioned water pump is prone to air entrapment, and has the advantages of ensuring the normal operation of the submersible pump and guaranteeing the pressure of the submersible pump.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A micro impeller submersible pump comprises a pump body, a filter housing, a motor, a closed impeller, a check valve and a plug cover;

[0008] The filter cover is installed at the bottom of the pump body, and a plurality of filter holes are arranged on the filter cover, and a water inlet cavity is formed between the filter cover and the bottom of the pump body;

[0009] The pump body is provided with a water passage cavity; the bottom of the pump body is provided with a water passage portion protruding downward, and an annular space is provided between the outer wall of the protruding water passage portion and the side wall of the water inlet cavity; the top of the pump body is provided with a water outlet portion;

[0010] The water passing part has a water passing port in it, which connects the water inlet cavity and the water passing cavity; the water outlet part has a water outlet connecting the outside and the water passing cavity;

[0011] The motor is installed in the pump body, the power output end at the bottom of the motor is drivingly connected to the closed impeller, the bottom clearance of the closed impeller is matched with the bottom surface of the water passage chamber, the middle of the bottom of the closed impeller is an impeller water inlet hole, and the impeller water inlet hole is located opposite to the water passage port;

[0012] The blocking cover blocks the annular space, and is provided with a through hole for the water passing part to pass through. The bottom surface of the blocking cover is an upwardly concave cone surface, and the center of the cone surface is the through hole.

[0013] Furthermore, the bottom surface of the water flow chamber of the pump body is a concave conical structure, the center of the conical structure is the water flow outlet, and the upper part of the water flow outlet is concave to form an annular step; a protrusion is convex below the center of the bottom of the closed impeller, the protrusion is inserted into the water flow outlet, and the bottom surface gap of the protrusion fits with the top surface of the annular step, and the impeller water inlet hole is located in the protrusion.

[0014] Furthermore, the pump body includes an outer shell and an inner shell, both of which are cylindrical structures; the inner shell is coaxially installed inside the outer shell, and an annular water passage chamber is formed between the outer shell and the inner shell; the motor is installed in the inner shell, and the power output end of the motor extends out of the bottom of the inner shell and is connected to the closed impeller.

[0015] Furthermore, the outer wall of the inner shell is provided with at least three circumferentially spaced limiting ribs, each of which abuts against the inner wall of the outer shell to keep the inner shell and the outer shell coaxial.

[0016] Furthermore, the water outlet has a check channel, one end of the check channel is the water outlet connected to the outside, and the other end is a check port connected to the water chamber, and a check valve is installed at the check port; a pressure switch is also installed on the top of the pump body to detect the water pressure in the check channel;

[0017] The top of the pump body is provided with a detection channel connected to the check channel; the detection end of the pressure switch is located in the detection channel; the detection channel extends horizontally, and the detection channel includes a detection area and a conducting channel, the inner end of the conducting channel is connected to the detection area, the detection end is located in the detection area, and the outer end of the conducting channel is connected to the side wall of the check channel; the bottom of the conducting channel is provided with a slope rising toward the detection area, so that the conducting channel is narrow inside and wide outside.

[0018] Furthermore, the detection flow channel is located between the inner shell and the outer shell at the top of the pump body; the pressure switch is arranged inside the inner shell and located above the motor; the detection end of the pressure switch extends out of the inner shell and is located in the detection flow channel.

[0019] Furthermore, the inner shell is also provided with a control circuit board, which is located between the pressure switch and the motor and is electrically connected to the pressure switch and the motor respectively, and is used to control the opening and closing of the motor according to the state of the pressure switch.

[0020] Furthermore, the power output end has a "D"-shaped mounting section, a limit groove is recessed in the middle of the mounting section, and the upper and lower sides of the limit groove are limit steps; the center of the closed impeller is provided with a "D"-shaped axial hole adapted to the mounting section so as to be synchronously rotated with the mounting section, and the inner wall of the axial hole protrudes with a limit block that is embedded in the limit groove between the two limit steps.

[0021] Furthermore, the check valve includes a piston and an annular sealing gasket, the piston rod of the piston can be reciprocatingly slidably inserted into a guide hole set in the check channel, the piston body of the piston is recessed with an annular groove, the annular sealing gasket is sleeved and fixed in the annular groove, the piston body is movably inserted into the check port, and cooperates with the annular sealing gasket to movably seal the check port.

[0022] Furthermore, an exhaust structure is provided on the top of the pump body on one side of the water outlet, and the exhaust structure includes an exhaust channel and a ball. One end of the exhaust channel is an air leakage hole connected to the outside world, and the other end is an exhaust hole connected to the water cavity. The ball can be moved up and down in the exhaust channel, and the apertures of the air leakage hole and the exhaust hole are smaller than the diameter of the ball.

[0023] After adopting the above technical scheme, firstly, the water pump adopts a closed impeller, and the bottom gap of the closed impeller is matched with the bottom surface of the water passage chamber to prevent the water in the water passage chamber from flowing back to the water outlet, thereby effectively increasing the output water pressure of the water pump; secondly, a blocking cover is provided to seal the annular space to prevent a large amount of air from accumulating in the annular space, thereby preventing the closed impeller from sucking the air accumulated in the water inlet chamber into the impeller water inlet hole when the water pump is working, thereby avoiding the formation of trapped air, thereby ensuring the normal operation of the water pump, and the center of the conical surface of the blocking cover is the through hole, and the provision of the conical surface helps to guide the water to flow from the water inlet chamber to the water outlet, thereby ensuring the output water pressure of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0025] Figure 2 A top view of an embodiment of the utility model;

[0026] Figure 3 An exploded view of an embodiment of the utility model;

[0027] Figure 4 for Figure 2 Plane section view at AA;

[0028] Figure 5 for Figure 4 Stereoscopic view of

[0029] Figure 6 for Figure 2 Plane section view at BB;

[0030] Figure 7 It is a working schematic diagram of an embodiment of the utility model;

[0031] Figure 8 for Figure 4 Enlarged view of point C.

[0032] Description of reference numerals: water pump 10;

[0033] Pump body 1, water passing part 11, water passing port 111, annular step 1111, water outlet 12, check channel 121, water outlet 122, check port 123, conical surface structure 13, cover plate 14, detection flow channel 15, detection area 151, conduction channel 152, slope 153, exhaust structure 16, exhaust channel 161, ball 162, air leakage hole 163, exhaust hole 164, outer shell 17, inner shell 18, lower shell 181, upper shell 182, limiting rib 183;

[0034] Filter cover 2, filter hole 21;

[0035] Motor 3, power output end 31, mounting section 311, limiting groove 312, limiting step 313, oil seal 32;

[0036] Closed impeller 4, impeller water inlet hole 41, impeller flow channel 42, protrusion 43, shaft hole 45, limiting protrusion 451;

[0037] Check valve 5, piston 51, piston rod 511, piston body 512, annular groove 5121, annular sealing gasket 52, guide hole 53;

[0038] Pressure switch 6, detection end 61;

[0039] A plug cover 7, a through hole 71, a conical surface 72, and a recessed structure 73;

[0040] Control circuit board 9, wiring harness 91;

[0041] Drain pipe 20, drain valve 201, power supply 30, water tank 40;

[0042] Water inlet chamber 50 , water passage chamber 60 ; and annular space 70 . DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] like Figures 1 to 6 As shown, a micro impeller submersible pump 10 of the utility model includes a pump body 1, a filter cover 2, a motor 3, a closed impeller 4, a check valve 5, a pressure switch 6 and a plug cover 7.

[0045] like Figure 3 and Figure 4 In order to facilitate water pumping and filtering, the filter cover 2 is installed at the bottom of the pump body 1. A plurality of filter holes 21 are provided on the filter cover 2, and a water inlet cavity 50 is formed between the filter cover 2 and the bottom of the pump body 1. In this embodiment, the filter holes 21 can be densely distributed on the side wall of the filter cover 2 at circumferential intervals.

[0046] The pump body 1 has a water passage cavity 60 therein; a water passage portion 11 protruding downward is provided at the bottom of the pump body 1, and an annular space 70 is provided between the outer wall of the protruding water passage portion 11 and the side wall of the water inlet cavity S2; and a water outlet portion 12 is provided at the top of the pump body 1.

[0047] The water passing portion 11 has a water passing port 111 therein, and the water passing port 111 connects the water inlet chamber 50 and the water passing chamber 60 ; liquid can enter the water inlet chamber 50 from the filter hole 21 and then enter the water passing chamber 60 from the water passing port 111 .

[0048] See also Figure 5 The water outlet portion 12 has a check channel 121 in it, one end of the check channel 121 is a water outlet 122 connected to the outside, and the other end is a check port 123 connected to the water chamber 60, and a check valve 5 is installed at the check port 123; the check valve 5 is set to maintain the pressure of the check channel 121, which can ensure that the water output by the water pump 10 has a certain water pressure, and can also provide pressure information to the pressure switch 6.

[0049] The motor 3 is installed in the pump body 1, and the power output end 31 at the bottom of the motor 3 is transmission-connected to the closed impeller 4, so that the bottom of the closed impeller 4 can be loosely fitted with the bottom surface of the water passage chamber 60 to prevent the water in the water passage chamber 60 from flowing back to the water passage port 111, so as to increase the pressure of the water pressure output by the water pump 10, and the middle of the bottom of the closed impeller 4 is the impeller water inlet hole 41, and the impeller water inlet hole 41 is located opposite to the water passage port 111.

[0050] In this embodiment, the motor 3 model can be selected as 545 model, DC12V, no-load speed 16500±10%rpm; the motor 3 rotates after being energized, thereby driving the closed impeller 4 to rotate, and the closed impeller 4 rotates to make the water outlet 111 absorb water from the water inlet chamber 50, and the water enters the impeller water inlet hole 41, and then is ejected from the impeller flow channel 42 into the water chamber 60. The closed impeller 4 adopts the structure and parameters of the existing technology (the specific structure is not repeated here), which can ensure that the maximum water pressure output by the water pump 10 reaches above 24.5psi.

[0051] Furthermore, by setting the blocking cover 7 to cover the annular space 70 between the outer wall of the water flow portion 11 and the side wall of the water inlet chamber 50, a large amount of air can be prevented from accumulating in the annular space 70, and the closed impeller 4 can be prevented from sucking the air accumulated in the water inlet chamber 50 into the impeller water inlet hole 41 when the water pump 10 is working, and the air cannot be discharged from the impeller flow channel 42, causing the closed impeller 4 to be unable to absorb water to form trapped air, so as to ensure the normal operation of the water pump 10; and the blocking cover 7 has a through hole 71 for the water flow portion 11 to pass through, and the bottom surface of the blocking cover 7 is an upwardly concave conical surface 72, and the center of the conical surface 72 is the through hole 71. The provision of the conical surface 72 helps to guide water from the water inlet chamber 50 to the water flow port 111.

[0052] The plugging cover 7 of this embodiment is an annular structure, and can be welded and fixed to the bottom surface of the pump body 1. The top surface of the plugging cover 7 is a concave structure 73 to reduce weight and save materials.

[0053] At the same time, in order to realize the functions of starting and stopping at any time, a pressure switch 6 is installed on the top of the pump body 1 in this embodiment to detect the water pressure in the check channel 121. Figure 7 When the water outlet 122 of the water pump 10 is connected to the drain pipe 20 with the drain valve 201, the water pump 10 is directly connected to the power supply 30 without the need for a switch in the middle. After the water pump 10 is connected to the power supply 30, the water pump 10 is placed in the water tank 40 and starts working.

[0054] Since the enclosed impeller 4 is used in this solution, the maximum water pressure output by the water pump 10 can reach more than 24.5psi. The maximum water pressure refers to the maximum water pressure in the check channel 121 after the drain valve 201 is closed; when the drain valve 201 is opened to allow the water pump 10 to discharge water normally, the water pressure range in the check channel 121 can be roughly maintained at 13psi~20psi, so the working range of the pressure switch 6 can be set at 13psi~20psi; accordingly, the pressure switch 6 can select a starting pressure of 8psi~12psi and a stopping pressure of 21psi~24.5psi, so that the pressure switch 6 can control the water pump 10 to work normally without frequent start and stop.

[0055] Therefore, when the drain valve 201 is opened, the pressure in the check channel 121 connected to the drain pipe 20 is within the starting range of the pressure switch 6, the motor 3 runs, and the water pump 10 continues to work. When the drain valve 201 is closed, the pressure in the check channel 121 increases, and the pressure exceeds the working range of the pressure switch 6, the motor 3 stops, and the water pump 10 stops working. When the drain valve 201 is opened again, the pressure in the check channel 121 is released, and the pressure in the check channel 121 returns to the working range of the pressure switch 6, the motor 3 runs, and the water pump 10 restarts to continue draining. When the water level in the water tank 40 drops to a level where the water pump 10 cannot work normally, the pressure in the check channel 121 decreases to less than the working range of the pressure switch 6, the motor 3 stops, and the water pump 10 stops working.

[0056] like Figure 4 and Figure 5 In this embodiment, the bottom surface of the water passage chamber 60 of the pump body 1 is a concave conical structure 13, the center of the conical structure 13 is the water passage 111, and the upper part of the water passage 111 is concave to form an annular step 1111; a protrusion 43 is convex below the bottom center of the closed impeller 4, the protrusion 43 is inserted into the water passage 111, and the bottom surface clearance of the protrusion 43 is matched with the top surface of the annular step 1111, and the impeller water inlet 41 is located in the protrusion 43. The conical structure 13 is provided to increase the matching area between the closed impeller 4 and the bottom surface of the water passage chamber 60, and further prevent water from flowing back; at the same time, the annular step 1111 is provided to prevent water from flowing back to the water passage 111, so as to increase the pressure of the water pump 10.

[0057] like Figure 3 , Figure 4 and Figure 5 In this embodiment, the pump body 1 of the micro impeller submersible pump 10 includes an outer shell 17 and an inner shell 18, and both the inner shell 18 and the outer shell 17 are cylindrical structures; the inner shell 18 is coaxially installed inside the outer shell 17, and an annular water passage chamber 60 is formed between the outer shell 17 and the inner shell 18; the top of the outer shell 17 can be provided with an opening, and the inner shell 18 can be installed in the outer shell 17 through the opening at the top, and the connection between the two can be welded as a whole; a cover plate 14 can be provided above the inner shell 18 for sealing.

[0058] The motor 3 is installed in the inner shell 18 , and the power output end 31 of the motor 3 extends out of the bottom of the inner shell 18 and is connected to the closed impeller 4 .

[0059] The inner shell 18 may further include a lower shell 181 and an upper shell 182, which are sealed and connected to each other. The motor 3 is installed in the lower shell 181 in the inner shell 18, and the power output end 31 of the motor 3 extends out of the bottom of the inner shell 18 and is connected to the closed impeller 4. An oil seal 32 may be provided between the closed impeller 4 and the bottom of the inner shell 18 for waterproof sealing.

[0060] See also Figure 3 The outer wall of the inner shell 18 is provided with at least three circumferentially spaced limiting ribs 183, each limiting rib 183 abuts against the inner wall of the outer shell 17 to keep the inner shell 18 and the outer shell 17 coaxial, ensuring that when the closed impeller 4 rotates, it always fits with the water outlet 111 without eccentric interference, thereby ensuring that the working pressure of the water pump 10 is sufficient.

[0061] In this embodiment, the power output end 31 has a "D"-shaped mounting section 311, and in order to prevent the closed impeller 4 from axial displacement, a limiting groove 312 is recessed in the middle of the mounting section 311, and the upper and lower sides of the limiting groove 312 are limiting steps 313; and the center of the closed impeller 4 is provided with a "D"-shaped shaft hole 45 adapted to the mounting section 311, so as to be synchronously rotated with the mounting section 311, and the inner wall of the shaft hole 45 protrudes with a limiting protrusion 451 that is embedded in the limiting groove 312 between the two limiting steps 313. Thus, the motor 3 rotates, so that the power output end 31 drives the closed impeller 4 to rotate, and the limiting groove 312 and the limiting protrusion 451 cooperate, so that the closed impeller 4 will not deviate axially up and down, and will not interfere with the water outlet 111 of the pump body 1, ensuring that the working pressure of the water pump 10 is sufficient.

[0062] like Figure 4 and Figure 5 In this embodiment, a detection channel 15 may be provided between the inner shell and the outer shell at the top of the pump body 1 and connected to the check channel 121; at the same time, the pressure switch 6 may be arranged in the upper shell 182 inside the inner shell 18 and located above the motor 3, and the detection end 61 of the pressure switch 6 for detecting the pressure extends out of the top of the inner shell 18 and is located in the detection channel 15. In this way, the size of the product can be ensured to be small enough, and at the same time, the pressure switch 6 is arranged inside the inner shell 18, and a separate waterproof structure for the pressure switch 6 can be omitted. Of course, the pressure switch 6 may not be arranged inside the inner shell 18, and is not limited to the structure of this embodiment.

[0063] For details, see Figure 8 In this embodiment, the detection channel 15 extends horizontally. In this embodiment, the detection channel 15 extends horizontally. The detection channel 15 includes a detection area 151 and a conducting channel 152. The inner end of the conducting channel 152 is connected to the detection area 151, the detection end 61 is located in the detection area 151, and the outer end of the conducting channel 152 is connected to the side wall of the check channel 121; the bottom of the conducting channel 152 is provided with a slope 153 that rises toward the detection area 151, so that the conducting channel 152 is narrow inside and wide outside.

[0064] The slope 153 is provided to ensure the normal operation of the water pump 10. In order to reduce the space occupied by the pressure switch 6 and reduce the height of the product, the detection channel 15 is designed to be smaller in this embodiment. However, the existing sample test found that when the conduction channel 152 flowing to the pressure switch 6 is designed to extend horizontally with equal width, after the water pump 10 is used and removed from the drain pipe 20, if the water pump 10 is reconnected to the drain pipe 20 in a short time, there will be water accumulation in the detection channel 15. When the water pump 10 is restarted, it is found that since the water in the conduction channel 152 cannot be discharged and the detection channel 15 is too small, most of the pressure cannot enter from the detection channel 15 after the water pump 10 is started, and the pressure switch 6 cannot be triggered, resulting in the water pump 10 not being able to respond immediately after the valve of the water outlet 122 is closed, and the water pump 10 cannot be controlled to automatically stop. The water pump 10 needs to be drained for a certain period of time before it can return to normal.

[0065] During the actual development and design of this embodiment, it was found that when the detection channel 15 is designed to be narrow inside and wide outside, after the water pump 10 is removed from the drain pipe 20, the water in the detection channel 15 can flow out from the conduction channel 152 in time, without affecting the rapid entry of water into the conduction channel 152 of the detection channel 15 after reinstallation, and pressure conduction can be achieved in time, which is convenient for the normal operation of the pressure switch 6. In addition, the inner end of the slope 153 can also be rounded to facilitate the flow of liquid.

[0066] See also Figure 8 As shown in Table 1 below, the following test was conducted on the angle α of the slope 153 in the above-mentioned conducting channel 152. When the height of the conducting channel 152 was 1.65 mm and the length was 7.2 mm, it was found that the optimal angle α of the slope 153 was ≥ 6°.

[0067] Table 1

[0068]

[0069] like Figures 3 to 5 As shown, in this embodiment, the inner shell 18 is further provided with a control circuit board 9, which is located between the pressure switch 6 and the motor 3, can be located in the upper shell 182, and is electrically connected to the pressure switch 6 and the motor 3, respectively, for controlling the opening and closing of the motor 3 according to the state of the pressure switch 6. In this embodiment, the motor 3, the pressure switch 6 and the control circuit board 9 can be connected to the external power supply 40 through the wiring harness 91 for external power supply.

[0070] At the same time, the control circuit board 9 controls the opening and closing of the motor 3 according to the opening and closing of the pressure switch 6, and a detection program can be added to the control circuit board 9 to start the motor 3 of the water pump 10 once every period of time. If the pressure is still insufficient, the pressure switch 6 will not work, and the water pump 10 will still not work. If water is added to the water tank 40 again, the water pump 10 starts, the pressure increases, the pressure switch 6 works normally, and the water pump 10 can continue to work, thereby achieving automatic start.

[0071] In this embodiment, the check valve 5 includes a piston 51 and an annular sealing gasket 52. The piston rod 511 of the piston 51 can be reciprocatingly slidably inserted into a guide hole 53 provided in the check channel 121. The piston body 512 of the piston 51 is concavely provided with an annular groove 5121. The annular sealing gasket 52 is sleeved and fixed in the annular groove 5121. The piston body 512 is movably inserted into the check port 123 and cooperates with the annular sealing gasket 52 to movably block the check port 123. The annular sealing gasket 52 can be provided so that the rubber annular sealing gasket 52 can better fit the plastic part at the check port 123 when the pressure is small, thereby achieving better check.

[0072] like Figure 1 , Figure 3 and Figure 6 As shown, in order to further avoid the problem of air entrapment in the pump body 1, the present embodiment is provided with an exhaust structure 16 on one side of the water outlet 12 at the top of the pump body 1, the exhaust structure 16 includes an exhaust channel 161 and a ball 162, one end of the exhaust channel 161 is an air leakage hole 163 connected to the outside, and the other end is an exhaust hole 164 connected to the water cavity 60, the ball 162 can be moved up and down in the exhaust channel 161, and the diameter of the ball 162 is larger than the aperture of the air leakage hole 163 and the exhaust hole 164, and the diameter of the ball 162 is smaller than the inner diameter of the exhaust channel 161, and the ball 162 can be a steel ball.

[0073] Therefore, when the check valve 5 of the water pump 10 is working under pressure, when the water pump 10 is put into the water tank from a waterless place, water enters the water chamber 60 from the water inlet 111, and the water squeezes the gas in the water chamber 60, allowing the gas to push the ball 162 from the exhaust hole 164 and be discharged through the air leakage hole 163 along the exhaust channel 161. When the water pump 10 is working, the water pressure pushes the ball 162 up to block the air leakage hole 163; and when the water pump 10 is not working, the ball 162 falls back to block the exhaust hole 164 to prevent external air from entering, so that there will be no air in the water chamber 60, avoiding trapped air.

[0074] To sum up, the micro impeller submersible pump 10 of the utility model adopts the basic structure of the impeller submersible pump 10, sets a closed impeller 4 to increase the pressure of the water pump 10, and then sets a pressure switch 6 for detecting the drainage pressure at the drainage check channel 121. The motor 3 is started and stopped by the change of the drainage pressure, and the purpose of starting and stopping the micro impeller submersible pump 10 as needed is effectively achieved. At the same time, a plugging cover 7 and an exhaust structure 16 are set to effectively solve the problem of air trapped in the water pump 10. It has a clever structure and a high degree of automation, which effectively improves the user experience.

[0075] The above is only a preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, equivalent changes and modifications without departing from the principle of the utility model should still fall within the protection scope of the utility model.

Claims

1. A micro impeller submersible pump, characterized in that: It includes pump body, filter housing, motor, closed impeller, check valve and plug cover; The filter cover is installed at the bottom of the pump body, and a plurality of filter holes are arranged on the filter cover, and a water inlet cavity is formed between the filter cover and the bottom of the pump body; The pump body is provided with a water passage cavity; the bottom of the pump body is provided with a water passage portion protruding downward, and an annular space is provided between the outer wall of the protruding water passage portion and the side wall of the water inlet cavity; the top of the pump body is provided with a water outlet portion; The water passing part has a water passing port in it, which connects the water inlet cavity and the water passing cavity; the water outlet part has a water outlet connecting the outside and the water passing cavity; The motor is installed in the pump body, the power output end at the bottom of the motor is drivingly connected to the closed impeller, the bottom clearance of the closed impeller is matched with the bottom surface of the water passage chamber, the middle of the bottom of the closed impeller is an impeller water inlet hole, and the impeller water inlet hole is located opposite to the water passage port; The blocking cover blocks the annular space, and is provided with a through hole for the water passing part to pass through. The bottom surface of the blocking cover is an upwardly concave cone surface, and the center of the cone surface is the through hole.

2. A micro impeller submersible pump according to claim 1, characterized in that: The bottom surface of the water passage chamber of the pump body is a concave conical structure, the center of the conical structure is the water passage, and the upper part of the water passage is concave to form an annular step; a protrusion is convex below the center of the bottom of the closed impeller, the protrusion is inserted into the water passage, and the bottom surface gap of the protrusion fits in the top surface of the annular step, and the impeller water inlet hole is located in the protrusion.

3. A micro impeller submersible pump according to claim 1, characterized in that: The pump body comprises an outer shell and an inner shell, both of which are cylindrical structures; the inner shell is coaxially installed inside the outer shell, and an annular water passage cavity is formed between the outer shell and the inner shell; The motor is installed in the inner shell, and the power output end of the motor extends out of the bottom of the inner shell and is connected to the closed impeller.

4. A micro impeller submersible pump according to claim 3, characterized in that: The outer wall of the inner shell is provided with at least three circumferentially spaced limiting ribs, each of which abuts against the inner wall of the outer shell to keep the inner shell and the outer shell coaxial.

5. A micro impeller submersible pump according to claim 3, characterized in that: The water outlet is provided with a check channel, one end of the check channel is the water outlet connected to the outside, and the other end is a check port connected to the water chamber, and a check valve is installed at the check port; a pressure switch is also installed on the top of the pump body to detect the water pressure in the check channel; The top of the pump body is provided with a detection channel connected to the check channel; the detection end of the pressure switch is located in the detection channel; the detection channel extends horizontally, and the detection channel includes a detection area and a conducting channel, the inner end of the conducting channel is connected to the detection area, the detection end is located in the detection area, and the outer end of the conducting channel is connected to the side wall of the check channel; the bottom of the conducting channel is provided with a slope rising toward the detection area, so that the conducting channel is narrow inside and wide outside.

6. A micro impeller submersible pump according to claim 5, characterized in that: The detection flow channel is located between the inner shell and the outer shell at the top of the pump body; the pressure switch is arranged inside the inner shell and located above the motor; the detection end of the pressure switch extends out of the inner shell and is located in the detection flow channel.

7. A micro impeller submersible pump according to claim 6, characterized in that: The inner shell is also provided with a control circuit board, which is located between the pressure switch and the motor and is electrically connected to the pressure switch and the motor respectively, and is used to control the opening and closing of the motor according to the state of the pressure switch.

8. A micro impeller submersible pump according to claim 1, characterized in that: The power output end is provided with a "D"-shaped mounting section, a limit groove is recessed in the middle of the mounting section, and the upper and lower sides of the limit groove are limit steps; the center of the closed impeller is provided with a "D"-shaped shaft hole adapted to the mounting section so as to be synchronously rotated with the mounting section, and a limit block protrudes from the inner wall of the shaft hole and is embedded in the limit groove between the two limit steps.

9. A micro impeller submersible pump according to claim 1, characterized in that: The check valve includes a piston and an annular sealing gasket. The piston rod of the piston can be reciprocatingly slidably inserted into a guide hole set in the check channel. The piston body of the piston is recessed with an annular groove, and the annular sealing gasket is sleeved and fixed in the annular groove. The piston body is movably inserted into the check port and cooperates with the annular sealing gasket to movably seal the check port.

10. A micro impeller submersible pump according to claim 1, characterized in that: An exhaust structure is provided on the top of the pump body on one side of the water outlet, and the exhaust structure includes an exhaust channel and a ball. One end of the exhaust channel is an air leakage hole connected to the outside world, and the other end is an exhaust hole connected to the water cavity. The ball can be moved up and down in the exhaust channel, and the apertures of the air leakage hole and the exhaust hole are smaller than the diameter of the ball.

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