Piston type submersible protector

Abstract

The utility model discloses a piston type submersible oil protector which comprises a center shaft, a connector is connected to the outer side of the left end of the center shaft, the middle of the center shaft is hollow, a second connector is connected to the outer side of the right end of the center shaft in a sealed mode, a shell is connected between the connector and the outer side of the second connector in a sealed mode, and a shaft protection pipe is arranged on the outer side, located in the shell, of the center shaft. The left end of the shaft protection pipe is in sealed connection with the connector, the right end of the shaft protection pipe is connected with the second connector through a sealing ring, an expansion cavity is formed between the shaft protection pipe and the shell, a piston ring is arranged in the expansion cavity, and the inner side and the outer side of the piston ring are attached to the outer side of the shaft protection pipe and the inner side of the shell respectively. The hollow structure of the central shaft is communicated with the right end of the expansion cavity through the expansion oil outlet hole, the structure is simple, the operation is simple and convenient, the volume change of motor oil can be compensated through vertical movement, the structure is compact, the applicability is high, the installation is simple and convenient, and the condition of accidental jamming can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible motor protectors, in particular to a piston-type submersible motor protector. Background Art

[0002] The submersible motor protector is filled with motor oil, which is used to lubricate the bearings and cool the motor. During the operation of the motor, the motor oil will expand due to the increase in temperature. The protector needs to compensate for this volume change. The sedimentation type uses the different densities of the liquid to play a compensatory protection role, and the capsule type uses the contraction of the capsule to compensate for the volume change. The sedimentation type can only be used in vertical wells or inclined wells with a well inclination of less than 17°; the capsule type can be used in vertical wells and inclined wells; the capsule type will age and crack after repeated contraction, and the existing piston-type submersible protector has a complex structure, and the piston will get stuck if it is not used for a long time, which is very inconvenient for later repair and maintenance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a piston-type submersible oil protector with a simple structure and easy operation. It can not only compensate for the volume change of motor oil by up and down movement, but also has the advantages of compact structure, strong applicability, easy installation, etc., and can avoid accidental jamming, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a piston-type submersible oil protector, comprising a central shaft, a joint is connected to the outer side of the left end of the central shaft, the middle of the central shaft is hollow, and the outer side of the right end of the central shaft is sealed and connected to joint 2, a shell is sealed and connected between the joint and the outer sides of the joint 2, a shaft protection tube is provided on the outer side of the central shaft located inside the shell, the left end of the shaft protection tube is sealed and connected to the joint, the right end of the shaft protection tube is connected to joint 2 through a sealing ring, an expansion chamber is provided between the shaft protection tube and the shell, a piston ring is provided inside the expansion chamber, the inner and outer sides of the piston ring are respectively fitted with the outer side of the shaft protection tube and the inner side of the shell, the hollow structure of the central shaft is communicated with the right end of the expansion chamber through an expansion oil outlet hole, and side expansion components are evenly provided on the outer side of the shell, when the liquid expands due to heat, the oil enters the expansion chamber through the hollow structure of the central shaft, thereby pushing the piston ring to move in the expansion chamber, thereby compensating for the volume change of the motor oil.

[0005] Furthermore, the joint is connected to the central axis via a mechanical seal, a through hole is provided on the joint, the through hole is communicated with the left end of the expansion chamber, and the joint and the central axis can be sealed via the mechanical seal.

[0006] Furthermore, an L-shaped through hole is provided on the second connector, one end of the L-shaped through hole is connected to the right end of the expansion chamber, and one end of the L-shaped through hole located on the side of the second connector is closed by a screw, and the oil inside the expansion chamber can be released by screwing the screw.

[0007] Furthermore, the side expansion assembly includes an expansion tube, a slidingly connected piston head is provided inside the expansion tube, and the two ends of the expansion tube are respectively connected to the left and right ends of the expansion chamber through the connecting head. When the piston ring is stuck inside the expansion chamber, oil can enter the expansion tube through the connecting head, thereby pushing the piston head to move inside the expansion tube, thereby preventing accidents from occurring.

[0008] Compared with the prior art, the utility model has the following beneficial effects: the joint and the center shaft can be sealed by a mechanical seal; when the liquid expands due to heat, the oil enters the expansion chamber through the hollow structure of the center shaft, thereby pushing the piston ring to move in the expansion chamber, thereby compensating for the volume change of the motor oil; when the piston ring is stuck in the expansion chamber, the oil can enter the expansion tube through the connector, thereby pushing the piston head to move in the expansion tube, thereby preventing accidents; the piston-type submersible oil protector has a simple structure and is easy to operate. It can not only compensate for the volume change of the motor oil by moving up and down, but also has the advantages of compact structure, strong applicability, and easy installation, and can avoid accidental jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the utility model;

[0010] Figure 2 This is a schematic diagram of the oil flow structure of the motor of the utility model.

[0011] In the figure: 1 mechanical seal, 2 joint, 3 piston ring, 4 shaft protection tube, 5 center shaft, 6 expansion oil outlet hole, 7 joint 2, 8 side expansion assembly, 81 connecting head, 82 piston head, 83 expansion tube, 9 outer shell, 10 sealing ring, 11 expansion chamber, 12 screw. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] See also Figure 1-2The utility model provides a technical solution: a piston-type submersible oil protector, including a central shaft 5, a joint 2 is connected to the outer side of the left end of the central shaft 5, the middle of the central shaft 5 is hollow, and a joint 2 is sealed to the outer side of the right end of the central shaft 5, a shell 9 is sealed between the outer sides of the joint 2 and the joint 2 7, and a shaft protection tube 4 is arranged on the outer side of the central shaft 5 located inside the shell 9, the left end of the shaft protection tube 4 is sealed to the joint 2, the right end of the shaft protection tube 4 is connected to the joint 2 through a sealing ring 10, and an expansion joint is arranged between the shaft protection tube 4 and the shell 9. The expansion cavity 11 has a piston ring 3 disposed inside the expansion cavity 11. The inner and outer sides of the piston ring 3 are respectively fitted with the outer side of the shaft protection tube 4 and the inner side of the outer shell 9. The hollow structure of the central shaft 5 is connected to the right end of the expansion cavity 11 through the expansion oil outlet 6. The outer side of the outer shell 9 is evenly provided with a side expansion component 8. When the liquid expands due to heat, the oil enters the expansion cavity 11 through the hollow structure of the central shaft 5, so that the piston ring 3 can be pushed to move in the expansion cavity 11 to compensate for the volume change of the motor oil. The joint 2 and the central shaft 5 are connected by The mechanical seal 1 is connected, and a through hole is provided on the joint 2, which is connected to the left end of the expansion chamber 11. The mechanical seal 1 can seal the joint 2 and the central axis 5. The joint 2 7 is provided with an L-shaped through hole, one end of the L-shaped through hole is connected to the right end of the expansion chamber 11, and the end of the L-shaped through hole located on the side of the joint 2 7 is closed by a screw 12. The oil inside the expansion chamber 11 can be released by screwing the screw 12. The side expansion assembly 8 includes an expansion tube 83, and the expansion tube 83 is provided with a piston head 82 in a sliding connection. The two ends are respectively connected to the left and right ends of the expansion chamber 11 through the connecting head 81. When the piston ring 3 is stuck inside the expansion chamber 11, the oil can enter the expansion tube 83 through the connecting head 81, so that the piston head 82 can be pushed to move inside the expansion tube 83, thereby preventing accidents. The piston submersible protector has a simple structure and is easy to operate. It can not only use up and down movements to compensate for the volume change of the motor oil, but also has the advantages of compact structure, strong applicability, and easy installation, and can avoid accidental jamming.

[0014] During use: the joint 2 and the center shaft 5 can be sealed by the mechanical seal 1. When the liquid expands due to heat, the oil enters the expansion chamber 11 through the hollow structure of the center shaft 5, thereby pushing the piston ring 3 to move in the expansion chamber 11, thereby compensating for the volume change of the motor oil. When the piston ring 3 is stuck in the expansion chamber 11, the oil can enter the expansion tube 83 through the connector 81, thereby pushing the piston head 82 to move in the expansion tube 83, thereby preventing accidents.

[0015] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. A piston-type submersible oil protector, comprising a central shaft (5), characterized in that: The left end of the central shaft (5) is connected to a joint (2) on the outside, the middle of the central shaft (5) is hollow, and the right end of the central shaft (5) is sealedly connected to a second joint (7) on the outside, and a shell (9) is sealed between the joint (2) and the outside of the second joint (7). The central shaft (5) is provided with a shaft protection tube (4) on the outside of the shell (9), the left end of the shaft protection tube (4) is sealedly connected to the joint (2), and the right end of the shaft protection tube (4) is connected to the second joint (7) through a sealing ring (10). An expansion chamber (11) is provided between the shaft protection tube (4) and the shell (9), and a piston ring (3) is provided inside the expansion chamber (11). The inner side and outer side of the piston ring (3) are respectively fitted with the outer side of the shaft protection tube (4) and the inner side of the shell (9). The hollow structure of the central shaft (5) is communicated with the right end of the expansion chamber (11) through an expansion oil outlet hole (6), and the outer side of the shell (9) is evenly provided with a side expansion component (8).

2. A piston-type submersible oil protector according to claim 1, characterized in that: The joint (2) and the central shaft (5) are connected via a mechanical seal (1); a through hole is provided on the joint (2), and the through hole is communicated with the left end of the expansion chamber (11).

3. A piston-type submersible oil protector according to claim 1, characterized in that: The second joint (7) is provided with an L-shaped through hole, one end of the L-shaped through hole is communicated with the right end of the expansion chamber (11), and one end of the L-shaped through hole located on the side of the second joint (7) is closed by a screw (12).

4. A piston-type submersible oil protector according to claim 1, characterized in that: The side expansion assembly (8) comprises an expansion pipe (83), a slidably connected piston head (82) is provided inside the expansion pipe (83), and two ends of the expansion pipe (83) are respectively connected to the left end and the right end of the expansion chamber (11) through a connecting head (81).

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