A positive pressure waterproof device and waterproof method for submerged motor

Abstract

The present invention discloses a positive pressure waterproof device and waterproof method for a submersible motor. The waterproof device includes a positive pressure water replenishment structure, which is composed of a normal pressure box or a pressurized tank. The positive pressure water replenishment structure is connected to one end of a deflation branch pipe and a water replenishment branch pipe, and the deflation branch pipe and the water replenishment branch pipe are respectively provided with a deflation valve and a water replenishment valve; the other ends of the deflation branch pipe and the water replenishment branch pipe are both connected to the submersible motor; a liquid level gauge is provided on the side of the positive pressure water replenishment structure, a discharge valve is provided at the bottom of the positive pressure water replenishment structure, and the positive pressure water replenishment structure is provided with holes for injecting fresh water and checking the internal conditions of the positive pressure water replenishment structure. In addition, the positive pressure waterproof method of the present invention has simple construction steps, which not only improves the reliability of the submersible motor and prolongs its service life, but also greatly reduces the equipment maintenance cost and reduces the economic losses caused by equipment failure and shutdown.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible motor equipment, and in particular relates to a positive pressure waterproof device and a waterproof method for a submersible motor. Background Art

[0002] Submersible motors are generally used in combination with pumps, submerged in underground water or in rivers, lakes, oceans and other waters to work. Submersible motors can also be used as supporting power sources for various underwater machinery, such as drilling rig drive motors for bridge and building detection, and propeller power sources for various underwater survey ships.

[0003] Large submersible motors generally adopt a water-filled structure, that is, the motor is filled with fresh water to achieve heat exchange. This type of motor is widely used in marine environments. In actual use, it is found that the main reason for the frequent failure of submersible motors is that the external seawater enters the motor, which accelerates the corrosion rate of the internal parts of the motor, resulting in poor reliability of the submersible motor, greatly increasing the number of equipment maintenance and expenditures, and even causing unpredictable economic losses due to equipment failure and shutdown. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a positive pressure waterproof device and a waterproof method for a submerged motor.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A positive pressure waterproof device for a submersible motor comprises a positive pressure water replenishment structure, the positive pressure water replenishment structure is composed of a normal pressure box body or a pressurized tank body, one end of an air release branch pipe and a water replenishment branch pipe are connected to the positive pressure water replenishment structure, and an air release valve and a water replenishment valve are respectively provided on the air release branch pipe and the water replenishment branch pipe; the other ends of the air release branch pipe and the water replenishment branch pipe are both connected to the submersible motor; a liquid level gauge is provided on the side of the positive pressure water replenishment structure, a discharge valve is provided on the bottom of the positive pressure water replenishment structure, and the positive pressure water replenishment structure is provided with holes for injecting fresh water and checking the internal situation of the positive pressure water replenishment structure.

[0007] Furthermore, when the positive pressure water replenishment structure is a normal pressure box, the normal pressure box is made of stainless steel, and the top of the normal pressure box is provided with air holes and hand holes, through which fresh water can be replenished and the internal conditions of the box can be checked.

[0008] Furthermore, when the positive pressure water replenishment structure is a pressurized tank structure, the pressurized tank is made of stainless steel, and the pressure source of the pressurized tank is a compressed air pipeline provided by the user. A pressure gauge, a safety valve and a water injection valve are arranged on the top of the pressurized tank, and a stop valve is arranged on the compressed air pipeline. The inlet pressure of the tank is adjusted by the stop valve, and fresh water is injected through the water injection valve. The side wall of the pressurized tank is provided with a manhole for inspecting the internal condition of the tank.

[0009] Furthermore, the air release branch pipe and the water supply branch pipe are both made of PE material hose.

[0010] A positive pressure waterproofing method for a submersible motor comprises the following steps:

[0011] Step 1. According to the water pressure of the submersible motor's operating environment and the internal design water pressure requirements, select a positive pressure water replenishment structure with matching pressure; if a normal pressure water tank type is selected, it is necessary to ensure that the pressure formed by the installation height of the normal pressure water tank meets the internal design water pressure requirements of the submersible motor;

[0012] Step 2: Install the positive pressure water replenishment structure in place on the water surface;

[0013] Step 3: On the water surface, connect the positive pressure water supply structure to the submersible motor body through the water supply branch pipe and the air release branch pipe respectively;

[0014] Step 4: On the water surface, conduct an overall water pressure test on the submersible motor together with the water supply branch pipe and the air discharge branch pipe. The test pressure is 1.1 times the internal design water pressure of the submersible motor to ensure that the system maintains pressure for 15 minutes without pressure drop.

[0015] Step 5: Install the submersible motor equipment in place;

[0016] Step 6: Fill the main body of the positive pressure water replenishment structure with water and compressed air to allow the submerged motor equipment to run continuously for 24 to 30 hours. If there is no obvious change in the liquid level count value, it is confirmed that the positive pressure waterproof device is put into use normally and the submerged motor is waterproof.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] 1. The positive pressure waterproof device of the present invention has a simple structure and can provide a stable pressure source for the submerged motor, so that the medium pressure inside the motor is always greater than the medium pressure outside the motor, preventing external media (such as seawater, tiny sand particles, etc.) from entering the motor, greatly reducing the wear or corrosion rate of internal parts of the motor. In addition, the positive pressure waterproof method of the present invention has simple construction steps, effectively improving the reliability of the submerged motor and extending its service life, and reducing economic losses caused by equipment failure and shutdown.

[0019] 2. The positive pressure water replenishment structure of the present invention is connected to the submerged motor by a hose, which does not increase the workload of the pump and greatly optimizes the performance of the equipment. At the same time, a new way to monitor the internal sealing effect of the motor is added, which solves the technical problem that it is difficult to effectively monitor underwater equipment, provides strong support for the preventive maintenance of the equipment, greatly reduces the number of pump maintenance or overhaul times, and reduces labor costs and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of the positive pressure waterproofing method of the submersible motor.

[0021] Figure 2 It is a structural schematic diagram of a positive pressure water replenishment structure as a normal pressure water tank.

[0022] Figure 3 It is a structural schematic diagram of a positive pressure water replenishment structure as a pressurized tank body.

[0023] Figure numerals: 1-positive pressure water supply structure, 2-submerged motor, 3-air release valve, 4-air supply valve, 5-air release branch pipe, 6-water supply branch pipe, 7-liquid level gauge, 8-discharge valve, 9-hand hole, 10-air vent, 11-stop valve, 12-pressure gauge, 13-water injection valve, 14-safety valve, 15-manhole DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the invention provides a positive pressure waterproof device for a submerged motor, including a positive pressure water replenishment structure 1, to which a venting branch pipe 5 and a water replenishment branch pipe 6 are connected, and the venting branch pipe 5 and the water replenishment branch pipe 6 are respectively provided with a venting valve 3 and a water replenishment valve 4, and when the positive pressure waterproof device is normally used, the venting valve and the water replenishment valve are normally open; the positive pressure water replenishment structure 1 is provided with a liquid level gauge 7 in the form of a magnetic flap, and the fresh water consumption inside the main body of the positive pressure water replenishment structure can be observed by reading the liquid level gauge 7, and when it is found that the liquid level reading changes abnormally, the submerged motor 2 equipment needs to be extracted to the water surface for preventive maintenance; the bottom of the main body of the positive pressure water replenishment structure 1 is provided with a discharge valve 8, and when the positive pressure waterproof device is normally used, the discharge valve 8 is normally closed; the positive pressure water replenishment structure is divided into two types: a normal pressure box body and a pressurized tank body, and the main body is made of stainless steel. The top of the normal pressure tank is provided with an air vent 10, which is connected to the outdoor atmospheric environment. Fresh water is added and the internal condition of the tank is checked through the hand hole 9. The pressurized tank is connected to a compressed air pipeline provided by the user as a pressure source, and the inlet pressure is adjusted through the stop valve 11. A pressure gauge 12 and a safety valve 14 are provided on the top of the tank. Fresh water is added through the water injection valve 13, and the internal condition of the tank is checked through the manhole 15.

[0026] like Figure 1 As shown, the present invention also provides a positive pressure waterproof method for a submersible motor, which uses the positive pressure waterproof device for a submersible motor as described above for waterproof protection, and includes the following steps:

[0027] Step 1. According to the ambient water pressure and internal design water pressure requirements of the submersible motor 2 (the internal design water pressure of the submersible motor is generally 1 to 1.5 Bar greater than the ambient water pressure), select a positive pressure water replenishment structure 1 with matching pressure. If you choose a normal pressure water tank type, you need to ensure that the pressure formed by the installation height of the water tank can meet the internal design water pressure requirements of the submersible motor. At the same time, the dynamic seal, static seal and other components inside the submersible motor must be selected in terms of pressure resistance to ensure that they can be used normally under the internal design water pressure environment of the motor;

[0028] Step 2: On the water surface, the main body of the positive pressure water replenishment structure is put into place by hoisting or dragging, and the main body of the positive pressure water replenishment structure is installed and fixed by bolt connection or base welding;

[0029] Step 3: On the water surface, the positive pressure water supply structure is connected to the submerged motor body through the water supply branch pipe 6 and the air release branch pipe 5. The water supply branch pipe 6 and the air release branch pipe 5 are made of a whole section (no joint segment) of PE material hose. The hose joint is made of 316L material, the motor body end joint is a right-angle joint, and the motor hose end joint is a 90-degree elbow sleeve OD slip-on joint;

[0030] Step 4: On the water surface, the submerged motor 2 together with the water supply branch pipe 6 and the air release branch pipe 5 are subjected to an overall water pressure test. The test pressure is 1.1 times the internal design water pressure of the submerged motor 2 to ensure that the system maintains pressure for 15 minutes without pressure drop.

[0031] Step 5, install the submersible motor 2 in place. For example, the submersible motor equipment can be assembled on the water surface and then slowly put into the water. After the equipment is installed in place, make sure that the water supply branch pipe 6 and the air discharge branch pipe 5 are firmly fixed, and there is no external force squeezing to cause the hose to twist or deform;

[0032] Step 6: Pour water and compressed air (charged as needed) into the main body of the positive pressure water replenishment structure, and run the submerged motor equipment continuously for 24 hours. Observe that there is no obvious change in the liquid level count value to confirm that the positive pressure water replenishment device is put into use normally.

[0033] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, a person of ordinary skill in the art can also make many forms of specific changes under the guidance of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A positive pressure waterproof device for a submersible motor, characterized in that: It comprises a positive pressure water replenishment structure, which is composed of a normal pressure box or a pressurized tank, one end of a venting branch pipe and a water replenishment branch pipe are connected to the positive pressure water replenishment structure, and the venting branch pipe and the water replenishment branch pipe are respectively provided with a venting valve and a water replenishment valve; the other ends of the venting branch pipe and the water replenishment branch pipe are both connected to a submerged motor; a liquid level gauge is provided on the side of the positive pressure water replenishment structure, a discharge valve is provided on the bottom of the positive pressure water replenishment structure, and the positive pressure water replenishment structure is provided with holes for injecting fresh water and checking the internal conditions of the positive pressure water replenishment structure; the positive pressure water replenishment structure is divided into two types: a normal pressure box and a pressurized tank; when the positive pressure water replenishment structure is a normal pressure box, the normal pressure box is made of stainless steel, and an air vent and a hand hole are provided on the top of the normal pressure box, and fresh water is replenished and the internal conditions of the box are checked through the hand hole; When the positive pressure water replenishment structure is a pressurized tank structure, the pressurized tank is made of stainless steel, and the pressurized tank uses a compressed air pipeline provided by the user as a pressure source. A pressure gauge, a safety valve and a water injection valve are arranged on the top of the pressurized tank, and a stop valve is arranged on the compressed air pipeline. The inlet pressure of the tank is adjusted by the stop valve, and fresh water is injected through the water injection valve. The side wall of the pressurized tank is provided with a manhole for checking the internal situation of the tank; The air release branch pipe and the water supply branch pipe are both made of PE material hose; The positive pressure waterproof device can provide a stable pressure source for the submersible motor, so that the internal medium pressure of the submersible motor is always greater than the external medium pressure of the submersible motor, thereby preventing the external medium from entering the submersible motor and reducing the wear or corrosion rate of the internal parts of the submersible motor.

2. A positive pressure waterproofing method for a submerged motor, based on the positive pressure waterproofing device according to claim 1, characterized in that: The following steps are involved: Step 1. According to the water pressure of the submersible motor's operating environment and the internal design water pressure requirements, select a positive pressure water replenishment structure with matching pressure; when selecting a normal pressure water tank type, ensure that the pressure formed by the normal pressure water tank installation height meets the internal design water pressure requirements of the submersible motor; Step 2: Install the positive pressure water replenishment structure in place on the water surface; Step 3: On the water surface, connect the positive pressure water supply structure to the submersible motor body through the water supply branch pipe and the air release branch pipe respectively; Step 4: On the water surface, conduct an overall water pressure test on the submersible motor together with the water supply branch pipe and the air discharge branch pipe. The test pressure is 1.1 times the internal design water pressure of the submersible motor to ensure that the system maintains pressure for 15 minutes without pressure drop. Step 5: Install the submersible motor equipment in place; Step 6: Fill the main body of the positive pressure water replenishment structure with water and compressed air to allow the submerged motor equipment to run continuously for 24 to 30 hours. If there is no obvious change in the liquid level count value, it is confirmed that the positive pressure waterproof device is put into use normally and the submerged motor is waterproof.

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