Motor protection structure under low-temperature corrosion conducting medium working condition

Abstract

The utility model discloses a motor protection structure under a low-temperature corrosion conducting medium working condition, and relates to the technical field of immersed pumps, in particular to a protection technology of a motor under a low-temperature medium corrosive and conductive environment. The motor comprises a motor end cover, a motor shell part, a rotor part, a coupler and a coupler shell, the rotor part is arranged in the motor shell part; the top end of the rotor part is connected with the motor end cover; the bottom end of the rotor part is connected with the coupler; the coupler is arranged in the coupler shell; and the coupling shell is fixedly connected with the bottom end of the motor shell part. And the motor end cover and the motor shell as well as the motor shell and the coupling shell are sealed by double-layer sealing rings, namely a first sealing ring and a second sealing ring. According to the technical scheme, the serious problems that in the prior art, due to the fact that a low-temperature immersed pump is immersed in a low-temperature corrosion conducting medium, when a sealing problem occurs, a motor cannot work normally, and even the motor is short-circuited are solved.

Description

Technical Field

[0001] This utility model relates to a motor protection structure for low-temperature corrosive and conductive media, and particularly to a motor protection technology for low-temperature media in corrosive and conductive environments. Background Technology

[0002] Currently, devices used for the liquefaction, storage, transportation, and chemical production of low-temperature corrosive and conductive media all employ magnetically driven cryogenic submersible pumps. These pumps are entirely submerged in the low-temperature corrosive and conductive medium, with the motor installed inside the casing, and torque transmitted to drive the pump via a magnetic coupling. This can lead to corrosion of the motor's metal components due to chemical reactions in the low-temperature corrosive and conductive medium, causing the motor to malfunction. Furthermore, the entry of the low-temperature corrosive and conductive medium into the motor can damage the insulation layer of the motor windings, potentially causing a short circuit. Traditional processes use externally mounted API610 VS6 bag pumps, which employ mechanical seals and cannot achieve zero leakage. Moreover, with the increasing size of the equipment, these pumps no longer meet installation requirements. Therefore, removable, internally mounted submersible pumps are used.

[0003] In view of the problems existing in the above-mentioned existing technologies, it is necessary to study and design a new type of motor protection structure for low-temperature corrosive conductive media conditions, so as to solve the problems existing in the existing technologies. Summary of the Invention

[0004] The existing cryogenic submersible pumps, due to immersion in a low-temperature corrosive and conductive medium, are prone to motor malfunction when the seal fails, potentially leading to serious technical problems such as short circuits. Therefore, this invention provides a motor protection structure for operation in low-temperature corrosive and conductive media. The technical means employed in this invention are as follows:

[0005] A motor protection structure for low-temperature corrosive conductive media includes: a motor end cover, a motor housing component, a rotor component, a coupling, and a coupling housing;

[0006] Furthermore, the rotor assembly is housed within the motor housing assembly;

[0007] Furthermore, the top of the rotor component is connected to the motor end cover;

[0008] Furthermore, the bottom end of the rotor assembly is connected to the coupling;

[0009] Furthermore, the coupling is installed inside the coupling housing;

[0010] Furthermore, the coupling housing is fixedly connected to the bottom end of the motor housing component.

[0011] Furthermore, the motor housing component consists of a motor housing and a motor stator, which is interference-fitted into the motor housing.

[0012] Furthermore, the rotor assembly consists of a shaft and a motor rotor of a motor assembly that is interference-fitted onto the shaft.

[0013] Furthermore, the top end of the shaft is supported and connected to the motor end cover via a sealed bearing A, and the bottom end is supported and connected to the motor housing via a sealed bearing B.

[0014] Furthermore, the motor end cover and the motor housing are fixedly connected by fastener A;

[0015] Furthermore, the motor housing and the coupling housing are fixedly connected by fastener B.

[0016] Furthermore, a double-layer sealing ring is used to seal the motor end cover and the motor housing, as well as the motor housing and the coupling housing, namely the first sealing ring and the second sealing ring. After the overall assembly is completed, the motor end cover and the motor housing, as well as the motor housing and the coupling housing, are welded to form a sealed welded structure, which seals the motor components in the sealed cavity composed of the motor housing, the motor end cover, the coupling housing, and the coupling, thus isolating the motor components from the medium.

[0017] Furthermore, the motor leads on the motor component extend from the motor end cover and connect to external electrical components.

[0018] The assembly process of this utility model is as follows:

[0019] 1. Install the sealed bearing and rotor assembly, then install the whole assembly on the inverted motor end cover and lock it in place;

[0020] 2. Install the sealing ring between the motor housing and the motor end cover, and assemble the motor housing components with the motor end cover;

[0021] 3. Install the sealed bearing at the motor housing and tighten it securely;

[0022] 4. Install the coupling and the sealing ring between the coupling housing and the motor housing;

[0023] 5. Assemble the coupling housing with the end machine housing;

[0024] 6. After final assembly, weld the sealing welded structure to further ensure the sealing performance of the sealing cavity.

[0025] The usage process of this utility model is as follows:

[0026] The motor housing, motor end cover, and coupling housing are all used to transport low-temperature corrosive conductive media. The sealed cavity is filled with nitrogen gas at a pressure higher than that used to transport the low-temperature corrosive conductive media. Pressure monitoring is installed to monitor the sealing condition of the sealed cavity in real time to ensure the protection of the motor.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] Currently, existing cryogenic submersible motors are immersed in the medium along with the pump. However, this design is not suitable for cryogenic corrosive and conductive media, such as liquid ammonia. If such media enter the motor, they will react chemically with the motor's metal components and insulating varnish, potentially causing a short circuit and damage to the motor.

[0029] The motor protection technology of this utility model, through a special structural design, installs a double-layer sealing ring structure and seals the connection parts of the housing by welding, which can completely seal the stator and rotor of the motor inside the motor housing, and achieve complete isolation of the motor from low-temperature corrosive conductive media.

[0030] In summary, the technical solution of this utility model solves the problem in the prior art that cryogenic submersible pumps, due to being immersed in a low-temperature corrosive and conductive medium, are prone to motor malfunction when sealing problems occur, which can even lead to serious issues such as short circuits in the motor. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is an enlarged view of part I of this utility model.

[0034] In the diagram: 1. Motor end cover; 2. Fastener A; 3. Sealed bearing A; 4. Shaft; 5. Motor housing; 6. Motor components; 7. Fastener B; 8. Coupling; 9. Coupling; 10. Sealed bearing B; 11. Motor lead wire; 12. Sealed welded structure; 13. First sealing ring; 14. Second sealing ring. Detailed Implementation

[0035] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0040] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0042] As shown in the figure, this utility model provides a motor protection structure for low-temperature corrosive conductive media conditions, including: a motor end cover 1, a motor housing component, a rotor component, a coupling 8, and a coupling housing 9; the rotor component is installed in the motor housing component; the top end of the rotor component is connected to the motor end cover 1; the bottom end of the rotor component is connected to the coupling 8; the coupling 8 is installed inside the coupling housing 9; the coupling housing 9 is fixedly connected to the bottom end of the motor housing component.

[0043] The motor housing component consists of a motor housing 5 and a motor stator 6 that is interference-fitted into the motor housing 5.

[0044] The rotor assembly consists of a shaft 4 and a motor rotor of a motor assembly 6 that is interference-fitted onto the shaft 4.

[0045] The top end of shaft 4 is supported and connected to motor end cover 1 via sealed bearing A3, and the bottom end is supported and connected to motor housing 5 via sealed bearing B10.

[0046] The motor end cover 1 is fixedly connected to the motor housing 5 by fastener A2; the motor housing 5 is fixedly connected to the coupling housing 9 by fastener B7.

[0047] The motor end cover 1 and the motor housing 5, as well as the motor housing 5 and the coupling housing 9, are sealed with double-layer sealing rings, namely the first sealing ring 13 and the second sealing ring 14. After the overall assembly is completed, the motor end cover 1 and the motor housing 5, as well as the motor housing 5 and the coupling housing 9, are welded to form a sealed welded structure 12, which seals the motor component 6 in the sealed cavity composed of the motor housing 5, the motor end cover 1, the coupling housing 9 and the coupling 8, thus isolating the motor component 6 from the medium.

[0048] The motor lead wire 11 on the motor component 6 extends from the motor end cover 1 and connects to external electrical components. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A motor protection structure for low-temperature corrosive conductive media operation, characterized in that: The motor protection structure for low-temperature corrosive conductive media includes: motor end cover (1), motor housing component, rotor component, coupling (8) and coupling housing (9); The rotor component is installed in the motor housing component; The top of the rotor component is connected to the motor end cover (1); The bottom end of the rotor component is connected to the coupling (8); The coupling (8) is installed inside the coupling housing (9); The coupling housing (9) is fixedly connected to the bottom end of the motor housing component.

2. The motor protection structure for low-temperature corrosive conductive media as described in claim 1, characterized in that: The motor housing component consists of a motor housing (5) and a motor stator of a motor component (6) that is interference-fitted into the motor housing (5).

3. The motor protection structure for low-temperature corrosive conductive media as described in claim 1, characterized in that: The rotor component consists of a shaft (4) and a motor rotor of a motor component (6) that is interference-fitted onto the shaft (4).

4. The motor protection structure for low-temperature corrosive conductive media conditions according to claim 3, characterized in that: The top end of the shaft (4) is supported and connected to the motor end cover (1) by a sealed bearing A (3), and the bottom end is supported and connected to the motor housing (5) by a sealed bearing B (10).

5. The motor protection structure for low-temperature corrosive conductive media as described in claim 1, characterized in that: The motor end cover (1) and the motor housing (5) are fixedly connected by fastener A (2); The motor housing (5) and the coupling housing (9) are fixedly connected by fastener B (7).

6. The motor protection structure for low-temperature corrosive conductive media conditions according to claim 1, characterized in that: The motor end cover (1) and the motor housing (5) are sealed with double-layer sealing rings, namely the first sealing ring (13) and the second sealing ring (14). After the overall assembly is completed, the motor end cover (1) and the motor housing (5) and the motor housing (5) and the coupling housing (9) are welded to form a sealed welding structure (12), which seals the motor component (6) in the sealed cavity composed of the motor housing (5), the motor end cover (1), the coupling housing (9) and the coupling (8), so that the motor component (6) is isolated from the medium.

7. The motor protection structure for low-temperature corrosive conductive media as described in claim 2 or 3, characterized in that: The motor lead wire (11) on the motor component (6) extends out from the motor end cover (1) and connects to the external electrical components.

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