A submersible pump

Abstract

The present invention provides a submersible pump, which relates to the technical field of submersible pump machines, and comprises a pump body. The rotating shaft of the motor also passes through a first sealing bearing and a second sealing bearing arranged in the pump body. A waterproof cavitation chamber is also opened in the pump body between the first sealing bearing and the second sealing bearing. The rotating shaft of the motor passes through the waterproof cavitation chamber. The waterproof cavitation chamber is also connected to a pressurized gas cylinder through a pipeline. The pressurized gas cylinder is also connected to an opening and closing piston cylinder through a pipeline. At this time, the sealant in the sealant pump injection pipe can enter the waterproof cavitation chamber through a path connected to the waterproof cavitation chamber. The present invention offsets or even exceeds the inward pressure of the water body by filling the waterproof cavitation chamber with pressurized gas. The filled gas can also be used as a medium for monitoring the air tightness inside the waterproof cavitation chamber, indicating that the water pump is at risk of water ingress. The above device effectively solves the problem of short circuit of deep water pumps through water ingress through the rotating shaft, and greatly improves the safety of underwater operation of the pump machine.

Description

Technical Field

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

[0002] A new type of water pump with publication number "CN113339272A" in the prior art includes a pump body, a connecting sleeve is installed on the top of the pump body, the outer surface of the connecting sleeve is set as a clamping position, a water outlet pipe is installed on the outer surface of the connecting sleeve, a pump cover is arranged on the top of the connecting sleeve, and a buckle position is installed on the outer surface of the pump cover. The device assembles the water pump by a snap-on installation method, and each component is fixed and combined by snaps, so that the assembly of the water pump is relatively simple, which not only saves time and labor, but also reduces the assembly intensity of the staff. Through the snap-on installation method, the production and assembly time is reduced, the cost is reduced, and the production efficiency of the water pump is improved. In order to reduce the plastic of the outer shell and the body, only the motor shell is produced with ABS material, and the stator assembly, power cord and circuit board are placed in it and then injected with sealant to fix it to form a waterproof motor, which greatly reduces the cost of raw materials and brings great convenience to the production of water pumps.

[0003] However, the above-mentioned device still has obvious defects during use: existing submersible pumps usually have good sealing performance, but in some submersible pumps placed at a deeper depth, it was found that excessive water pressure would cause water to enter the water pump. Further analysis of the cause of the water ingress showed that the liquid entered the winding coil through the rotating shaft of the pump, causing the motor coil to short-circuit. However, the above-mentioned water pump has not been optimized specifically to address the disadvantage of the transmission shaft being easily infiltrated with water, which may make the submersible pump unsuitable for operation in deeper water bodies. Summary of the invention

[0004] The object of the present invention is to provide a submersible pump to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A submersible pump comprises a pump body, a centrifugal impeller accommodating chamber is integrally formed on one side of the pump body, the upper end of the centrifugal impeller accommodating chamber is communicated with a water outlet, the pump body on one side of the centrifugal impeller accommodating chamber is also snap-fitted with a front pump cover, a water inlet grille which is communicated with the centrifugal impeller accommodating chamber is also provided on the front pump cover, a centrifugal impeller is installed in the centrifugal impeller accommodating chamber, a side of the centrifugal impeller away from the water inlet grille is fixedly connected to a rotating shaft of a motor, the motor is installed in the motor accommodating chamber provided in the pump body, and a rear pump cover is also snap-fitted on the side of the pump body away from the front pump cover;

[0007] The rotating shaft of the motor also passes through the first sealed bearing and the second sealed bearing arranged in the pump body. A waterproof cavitation chamber is also opened in the pump body between the first sealed bearing and the second sealed bearing. The rotating shaft of the motor passes through the waterproof cavitation chamber. The waterproof cavitation chamber is also connected with a pressurized gas cylinder through a pipeline. The pressurized gas cylinder forms a pressurized air cavity in the waterproof cavitation chamber through the pressurized gas output by the pressurized gas cylinder. The pressurized gas cylinder is also connected with an opening and closing piston cylinder through a pipeline. An opening and closing piston is slidably arranged in the opening and closing piston cylinder. The opening and closing piston cylinder is arranged between the waterproof cavitation chamber and the sealant pump On the communication path of the injection pipe, when the interior of the waterproof cavitation chamber is in a pressurized air cavity state, the pressurized gas cylinder pushes the opening and closing piston to block the communication path between the waterproof cavitation chamber and the sealant pump injection pipe. When gas leakage occurs in the waterproof cavitation chamber, the opening and closing piston overcomes the pressure of the pressurized air cavity and slides translationally, thereby making the communication path between the waterproof cavitation chamber and the sealant pump injection pipe conductive. At this time, the sealant in the sealant pump injection pipe can enter the waterproof cavitation chamber through the path connected to the waterproof cavitation chamber, thereby sealing the waterproof cavitation chamber and preventing liquid from entering the inside of the motor through the waterproof cavitation chamber.

[0008] Preferably, the housing of the motor is made of ABS material, and the stator assembly, power cord and circuit board are placed inside the housing and then sealed with glue.

[0009] Preferably, the pressurized gas cylinder and the sealant pumping tube are both installed in the corresponding thread grooves of the pump body through external threads, and the pressurized gas cylinder and the sealant pumping tube are also coated with sealant before installation.

[0010] Preferably, the pressurized gas cylinder is an integrated steel cylinder, and a ejector pin is installed at the innermost side of the threaded groove where the pressurized gas cylinder is located. When the pressurized gas cylinder is screwed into the threaded groove until it touches the ejector pin, as the pressurized gas cylinder continues to rotate forward, the front end of the pressurized gas cylinder is perforated, and the gas inside the pressurized gas cylinder is released and enters the waterproof cavitation chamber.

[0011] Preferably, the sealant pump tube includes a tube body, a pushing piston and a pushing spring, the tube body is provided with a pushing port on the inner side of the threaded groove, the pushing spring is arranged on the side of the pushing piston away from the pushing port, when the pushing port is blocked by the opening and closing piston, the sealant inside the tube body is blocked and cannot enter the waterproof cavitation chamber, when the opening and closing piston is removed, the sealant inside the tube body is pushed by the elastic force of the pushing spring to enter and fill the entire waterproof cavitation chamber, thereby further preventing the liquid from entering the motor through the waterproof cavitation chamber.

[0012] Preferably, a traction spring is further provided on the side of the opening and closing piston in the opening and closing piston cylinder close to the communication path with the pressurized gas cylinder. The traction spring pulls the opening and closing piston when there is no external force, so that it breaks away from the communication path between the waterproof cavitation chamber and the sealant pumping tube. When no air leakage occurs in the waterproof cavitation chamber, the opening and closing piston overcomes the elastic force of the traction spring and performs work under the push of the gas inside the pressurized gas cylinder.

[0013] Preferably, a cavity inspection sealing block connected to the waterproof cavitation chamber is also installed at the bottom of the pump body, and the sealant filled in the waterproof cavitation chamber can be cleaned by opening the cavity inspection sealing block.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a waterproof cavitation chamber on the extension path of the transmission shaft, and fills the waterproof cavitation chamber with pressurized gas, thereby offsetting or even exceeding the inward pressure of the water body. This arrangement enables the submersible pump to still have excellent waterproof sealing performance in deep water areas. In addition, the filled gas can not only prevent liquid from penetrating, but also serve as a medium for monitoring the air tightness inside the waterproof cavitation chamber. When the internal gas leaks, it indicates that the water pump is at risk of water ingress. At this time, by filling sealant into the waterproof cavitation chamber, it can effectively prevent moisture from further entering the motor through the gap between the rotating shaft and the pump body. The above device effectively solves the problem of short circuit of deep water pumps through water ingress through the rotating shaft, and greatly improves the safety of the pump machine underwater operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention for disassembly and cleaning;

[0017] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the pipeline connection state of the pressurized gas cylinder of the present invention.

[0019] In the figure: 1 pump body, 2 centrifugal impeller accommodating compartment, 3 water outlet, 4 front pump cover, 5 water inlet grille, 6 centrifugal impeller, 7 motor, 8 rotating shaft, 9 motor accommodating compartment, 10 rear pump cover, 11 first sealing bearing, 12 second sealing bearing, 13 waterproof cavitation chamber, 14 pressurized gas cylinder, 15 opening and closing piston cylinder, 16 opening and closing piston, 17 sealant pump injection pipe, 18 threaded groove, 19 ejector pin, 20 tube body, 21 push injection piston, 22 push injection spring, 23 traction spring, 24 cavity maintenance sealing block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-3 , the present invention provides a technical solution: Example

[0022] A submersible pump comprises a pump body 1, a centrifugal impeller accommodating chamber 2 is integrally formed on one side of the pump body 1, the upper end of the centrifugal impeller accommodating chamber 2 is communicated with a water outlet 3, the pump body 1 on one side of the centrifugal impeller accommodating chamber 2 is also snap-fitted with a front pump cover 4, a water inlet grille 5 connected with the centrifugal impeller accommodating chamber 2 is also provided on the front pump cover 4, a centrifugal impeller 6 is installed in the centrifugal impeller accommodating chamber 2, a side of the centrifugal impeller 6 away from the water inlet grille 5 is fixedly connected to a rotating shaft 8 of a motor 7, the motor 7 is installed in a motor accommodating chamber 9 provided in the pump body 1, and a rear pump cover 10 is also snap-fitted on the side of the pump body 1 away from the front pump cover 4;

[0023] The rotating shaft 8 of the motor 7 also passes through the first sealed bearing 11 and the second sealed bearing 12 arranged in the pump body 1. A waterproof cavitation chamber 13 is also opened in the pump body 1 between the first sealed bearing 11 and the second sealed bearing 12. The rotating shaft 8 of the motor 7 passes through the waterproof cavitation chamber 13. The waterproof cavitation chamber 13 is also connected to the pressurized gas cylinder 14 through a pipeline. The pressurized gas cylinder 14 forms a pressurized air cavity in the waterproof cavitation chamber 13 through the output pressurized gas. The pressurized gas cylinder 14 is also connected to the opening and closing piston cylinder 15 through a pipeline. An opening and closing piston 16 is slidably arranged in the opening and closing piston cylinder 15. The opening and closing piston cylinder 15 is arranged between the waterproof cavitation chamber 13 and the sealant pump injection pipe 1 On the communication path of 7, when the interior of the waterproof cavitation chamber 13 is in a pressurized air cavity state, the pressurized gas cylinder 14 pushes the opening and closing piston 16 to block the communication path between the waterproof cavitation chamber 13 and the sealant pumping tube 17. When gas leakage occurs in the waterproof cavitation chamber 13, the opening and closing piston 16 overcomes the pressure of the pressurized air cavity and slides translationally, thereby making the communication path between the waterproof cavitation chamber 13 and the sealant pumping tube 17 conductive. At this time, the sealant in the sealant pumping tube 17 can enter the waterproof cavitation chamber 13 through the path connected to the waterproof cavitation chamber 13, thereby blocking the waterproof cavitation chamber 13 and preventing liquid from entering the interior of the motor 7 through the waterproof cavitation chamber 13.

[0024] In this embodiment, the pump body 1 adopts an integrated molding process, and a centrifugal impeller accommodating chamber 2 is formed on one side thereof. A centrifugal impeller 6 is movably installed in the centrifugal impeller accommodating chamber 2. The rotation of the centrifugal impeller 6 allows water to enter the water inlet grille 5 of the front pump cover 4, and enter the water outlet 3 under the action of centrifugal force during the rotation process, thereby realizing the water pumping operation. In the prior art, a sealed bearing is usually used as a sealing structure of the rotating shaft. However, if the submersible pump is placed at a deep depth below the water body, under the action of high water pressure, the long-term operation of the rotating shaft may cause poor air tightness of the sealed bearing, and then the water may enter the motor 7 along the rotating shaft. For this reason, the present invention In the embodiment, a double sealed shaft is arranged, and the rotating shaft 8 also passes through a first sealed bearing 11 and a second sealed bearing 12 arranged in the pump body 1. The first sealed bearing 11 and the second sealed bearing 12 are bearings with sealing rings and good airtightness, and a waterproof cavitation chamber 13 is opened in the pump body 1 between the first sealed bearing 11 and the second sealed bearing 12. The waterproof cavitation chamber 13 is connected to the pressurized gas cylinder 14 through a pipeline. The pressurized gas cylinder 14 forms a pressurized air cavity in the waterproof cavitation chamber 13 through the output pressurized gas. The pressurized air cavity is used to balance the high water pressure outside the waterproof cavitation chamber 13, so that the air pressure inside the waterproof cavitation chamber 13 is greater than the air pressure outside. The water pressure in the pump body 1 is prevented by the air pressure difference, and even if a small gap is generated between the first sealed bearing 11 or the second sealed bearing 12 during the use of the motor 7, the slow release of the gas in the pressurized gas cylinder 14 can ensure that the waterproof cavitation chamber 13 still maintains good waterproofness before the air pressure is released. In addition, the pressurized gas cylinder 14 in this embodiment is also connected to the opening and closing piston cylinder 15, and the opening and closing piston cylinder 15 adjusts the connection state between the waterproof cavitation chamber 13 and the sealant pump injection pipe 17 through the built-in opening and closing piston 16. When the waterproof cavitation chamber 13 loses pressure, the opening and closing piston cylinder 15 loses the sealant pump The front end of the injection tube 17 is blocked. At this time, the sealant inside the sealant pump injection tube 17 can enter the waterproof cavitation chamber 13, thereby completing the internal sealing, further improving the situation that when the first sealing bearing 11 and the second sealing bearing 12 fail, the sealing scheme of the sealant can still be used to prevent the motor 7 from entering with water. At this time, the circuit structure can also be designed so that when the opening and closing piston 16 of the opening and closing piston cylinder 15 slides, the circuit of the motor 7 is disconnected, and underwater pumping operation cannot be performed at this time, thereby prompting the staff to carry out maintenance in time and clean the sealant filled in the waterproof cavitation chamber 13, thereby ensuring that the submersible pump can continue to be used after maintenance. Example

[0025] The housing of the motor 7 is made of ABS material, and the stator assembly, power line and circuit board are placed inside the housing and then sealed with glue.

[0026] In this embodiment, only the housing of the motor 7 is made of ABS material, while the pump body 1 is made of a conventional polymer plastic housing, thereby reducing the cost of the device. Example

[0027] The pressurized gas cylinder 14 and the sealant pumping tube 17 are both installed in the corresponding thread groove 18 of the pump body through external threads. The pressurized gas cylinder 14 and the sealant pumping tube 17 are also coated with sealant before installation.

[0028] In this embodiment, the pressurized gas cylinder 14 and the sealant pump injection tube 17 are both installed on the pump body 1 by threads, which is convenient for later disassembly. At the same time, in order to ensure the airtightness after installation, the outside is also coated with sealant before installation. Example

[0029] The pressurized gas cylinder 14 is an integrated steel cylinder, and a ejector pin 19 is installed at the innermost side of the threaded groove 18 where the pressurized gas cylinder 14 is located. When the pressurized gas cylinder 14 is screwed into the threaded groove 18 until it touches the ejector pin 19, as the pressurized gas cylinder 14 continues to rotate forward, the front end of the pressurized gas cylinder 14 is perforated, and the gas inside the pressurized gas cylinder 14 is released and enters the waterproof cavitation chamber 13.

[0030] In this embodiment, the opening method of the pressurized gas cylinder 14 is further disclosed. After the installation is completed, the pressurized gas cylinder 14 is opened synchronously, so that the gas can be maintained in the waterproof cavitation chamber 13, thereby ensuring the internal pressurized state. Example

[0031] The sealant pump tube 17 includes a tube body 20, a push piston 21 and a push spring 22. The tube body 20 is provided with a push port on the inner side of the threaded groove 18. The push spring 22 is arranged on the side of the push piston 21 away from the push port. When the push port is blocked by the opening and closing piston 16, the sealant inside the tube body 20 is blocked and cannot enter the waterproof cavitation chamber 13. When the opening and closing piston 16 is removed, the sealant inside the tube body 20 is pushed by the elastic force of the push spring 22 to enter and fill the entire waterproof cavitation chamber 13, thereby further preventing the liquid from passing through the waterproof cavitation chamber 13 into the motor 7.

[0032] A traction spring 23 is also provided on the side of the opening and closing piston 16 in the opening and closing piston cylinder 15 close to the communication path with the pressurized gas cylinder 14. The traction spring 23 pulls the opening and closing piston 16 when there is no external force, so that it breaks away from the communication path between the waterproof cavitation chamber 13 and the sealant pump injection tube 17. When there is no leakage in the waterproof cavitation chamber 13, the opening and closing piston 16 overcomes the elastic force of the traction spring 23 and does work under the push of the gas inside the pressurized gas cylinder 14.

[0033] In this embodiment, the specific structure of the sealant pumping tube 17 and the opening and closing piston cylinder 15, as well as the injection process thereof, are further disclosed. At this time, the pressurized gas filled in the waterproof cavitation chamber 13 not only serves as a blocking mechanism for the water body and a detection mechanism for the internal pressure, but also serves as an autonomous release unit of the sealant pumping tube 17. When the internal pressure is lost, the opening and closing piston 16 is displaced to break away from the obstruction of the front end push injection port of the sealant pumping tube 17. At this time, the sealant inside the sealant pumping tube 17 is able to enter the waterproof cavitation chamber 13 through the opening and closing piston cylinder 15, thereby blocking the liquid from entering the motor 7 through the rotating shaft 8. Example

[0034] A cavity inspection sealing block 24 communicating with the waterproof cavitation chamber 13 is also installed at the bottom of the pump body 1 . The sealant filled in the waterproof cavitation chamber 13 can be cleaned by opening the cavity inspection sealing block 24 .

[0035] In this embodiment, a maintenance mechanism inside the waterproof cavitation chamber 13 is further disclosed, which is installed in a sealed manner. When the waterproof cavitation chamber 13 is filled with sealant, the motor 7 cannot work normally. At this time, it is necessary to disassemble the cavity for maintenance of the sealing block 24, and clean the sealing block 24 filled in the waterproof cavitation chamber 13, and disassemble the pump body 1 to replace the corresponding structure, or directly remove the motor 7 and replace the pump body 1 structure for use again.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submersible pump, comprising a pump body, characterized in that: A centrifugal impeller accommodating chamber is integrally formed on one side of the pump body, and the upper end of the centrifugal impeller accommodating chamber is communicated with the water outlet. The pump body on one side of the centrifugal impeller accommodating chamber is also snap-fitted with the front pump cover. The front pump cover is also provided with a water inlet grille communicated with the centrifugal impeller accommodating chamber. A centrifugal impeller is installed in the centrifugal impeller accommodating chamber. The side of the centrifugal impeller away from the water inlet grille is fixedly connected to the rotating shaft of the motor. The motor is installed in the motor accommodating chamber provided in the pump body. The side of the pump body away from the front pump cover is also snap-fitted with a rear pump cover, and the pump body is characterized in that: The rotating shaft of the motor also passes through the first sealed bearing and the second sealed bearing arranged in the pump body. A waterproof cavitation chamber is also opened in the pump body between the first sealed bearing and the second sealed bearing. The rotating shaft of the motor passes through the waterproof cavitation chamber. The waterproof cavitation chamber is also connected with a pressurized gas cylinder through a pipeline. The pressurized gas cylinder forms a pressurized air cavity in the waterproof cavitation chamber through the pressurized gas output by the pressurized gas cylinder. The pressurized gas cylinder is also connected with an opening and closing piston cylinder through a pipeline. An opening and closing piston is slidably arranged in the opening and closing piston cylinder. The opening and closing piston cylinder is arranged between the waterproof cavitation chamber and the sealant pump On the communication path of the injection pipe, when the interior of the waterproof cavitation chamber is in a pressurized air cavity state, the pressurized gas cylinder pushes the opening and closing piston to block the communication path between the waterproof cavitation chamber and the sealant pump injection pipe. When gas leakage occurs in the waterproof cavitation chamber, the opening and closing piston overcomes the pressure of the pressurized air cavity and slides translationally, thereby making the communication path between the waterproof cavitation chamber and the sealant pump injection pipe conductive. At this time, the sealant in the sealant pump injection pipe can enter the waterproof cavitation chamber through the path connected to the waterproof cavitation chamber, thereby sealing the waterproof cavitation chamber and preventing liquid from entering the inside of the motor through the waterproof cavitation chamber.

2. A submersible pump according to claim 1, characterized in that: The housing of the motor is made of ABS material, and the stator assembly, power line and circuit board are placed inside the housing and then sealed with glue.

3. A submersible pump according to claim 1 or 2, characterized in that: The pressurized gas cylinder and the sealant pumping tube are both installed in the corresponding thread grooves of the pump body through external threads, and the pressurized gas cylinder and the sealant pumping tube are also coated with sealant before installation.

4. A submersible pump according to claim 3, characterized in that: The pressurized gas cylinder is an integrated steel cylinder, and a ejector pin is installed at the innermost side of the threaded groove where the pressurized gas cylinder is located. When the pressurized gas cylinder is screwed into the threaded groove until it touches the ejector pin, as the pressurized gas cylinder continues to rotate forward, the front end of the pressurized gas cylinder is perforated, and the gas inside the pressurized gas cylinder is released and enters the waterproof cavitation chamber.

5. A submersible pump according to claim 4, characterized in that: The sealant pump tube includes a tube body, a push piston and a push spring. The tube body is provided with a push port on the inner side of the threaded groove. The push spring is arranged on the side of the push piston away from the push port. When the push port is blocked by the opening and closing piston, the sealant inside the tube body is blocked and cannot enter the waterproof cavitation chamber. When the opening and closing piston is removed, the sealant inside the tube body is pushed by the elastic force of the push spring to enter and fill the entire waterproof cavitation chamber, thereby further preventing the liquid from entering the motor through the waterproof cavitation chamber.

6. A submersible pump according to claim 5, characterized in that: A traction spring is also provided on the side of the opening and closing piston in the opening and closing piston cylinder close to the communication path with the pressurized gas cylinder. The traction spring pulls the opening and closing piston when there is no external force, so that it breaks away from the communication path between the waterproof cavitation chamber and the sealant pump injection tube. When there is no air leakage in the waterproof cavitation chamber, the opening and closing piston overcomes the elastic force of the traction spring and performs work under the push of the gas inside the pressurized gas cylinder.

7. A submersible pump according to claim 6, characterized in that: A cavity inspection and maintenance sealing block connected to the waterproof cavitation chamber is also installed at the bottom of the pump body, and the sealant filled in the waterproof cavitation chamber can be cleaned by opening the cavity inspection and maintenance sealing block.

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