A vertical motor shaft head sealing device

Abstract

The utility model discloses a vertical motor shaft head sealing device belongs to motor seal protection field. The present application through setting double -deck framework oil seal has improved the sealing effect of motor shaft head, through the cavity between the protection cover and the machine base end face sets up, the cavity is as buffer zone, has slowed down the damage of liquid leakage to motor, through setting up the liquid leakage alarm in the cavity, realizes liquid leakage monitoring, and sets up the drainage assembly and can discharge in time after liquid leakage into the cavity. The present application can be used in the scene that motor shaft head directly contacts with liquid, realizes the inspection of sealing effect and the monitoring of leakage, and discharges the leakage liquid before entering the motor, reduces the damage to motor.

Description

Technical Field

[0001] This application relates to the field of motor sealing and protection, and in particular to a vertical motor shaft sealing device. Background Technology

[0002] In vertical motors, where the shaft directly contacts the liquid, such as in water pumps, mixers, and ship propulsion, the requirements for sealing and protection technology are extremely high. Taking a marine vertical water-jacketed motor as an example, the sealed cavity below the mounting flange is filled with lubricating oil. If lubricating oil enters the motor, it will affect the normal operation and service life of the motor. Traditional vertical motor sealing methods, such as rubber seals, are prone to damage. After wear, gaps will appear, reducing the sealing performance. Contact seals generate friction, leading to increased mechanical wear, as well as heat and noise.

[0003] Existing sealing technologies need to balance sealing performance, wear resistance, corrosion resistance, and maintenance costs. Using skeleton oil seals to seal motors falls under the lip seal type of contact dynamic sealing. The application of skeleton oil seals in motors mainly falls into the following categories: single oil seal (single lip type), which has only one main sealing lip and is typically used to prevent lubricating oil leakage or dust. Its disadvantage is that it can only provide a unidirectional seal, preventing either oil leakage or dust, and cannot do both simultaneously; double oil seal (double lip type), which has two lips, a main lip to prevent liquid leakage and a secondary lip to prevent dust. Although skeleton oil seals are low-cost and easy to install, they share common disadvantages in motor applications: limited lifespan, and susceptibility to leakage after rubber aging and lip wear. In existing technologies, shaft head seals only prevent ingress; they lack verification of sealing effectiveness and monitoring of leakage, do not provide sufficient buffer space for potential leakage, and do not include structural design for handling leaked liquid after leakage occurs.

[0004] Therefore, it is necessary to develop a new type of vertical motor shaft sealing device to solve the motor shaft sealing problem; before the seal fails, the sealing effect and leakage are unmonitored; when the seal fails, liquid directly enters the motor without a buffer zone; and after leakage occurs, how to remove the leaked liquid is also addressed. Utility Model Content

[0005] This utility model proposes a vertical motor shaft sealing device, which solves the problem of motor shaft sealing, addresses the issues of unmonitored sealing effect and leakage, and resolves the problem of inability to automatically eliminate leakage.

[0006] The core technical solution of this utility model is as follows: the sealing effect is improved by using a double-layer skeleton oil seal, a cavity is set between the protective cover and the end face of the base, a leakage alarm is set in the cavity to realize liquid leakage monitoring, the cavity is used as a buffer to slow down the speed of the liquid leakage motor, and a drainage component is set to drain the liquid in time after it leaks into the cavity.

[0007] The specific technical solution of this application is as follows:

[0008] A vertical motor shaft sealing device is disclosed. The motor includes a motor shaft and a base end face. A protective cover is installed on the base end face. A cavity is provided between the protective cover and the base end face. A leakage alarm is installed in the cavity. The protective cover is provided with a mounting groove for installing a skeleton oil seal. After the motor shaft passes through the protective cover, the skeleton oil seal seals the motor shaft. The device also includes a drainage assembly. After the leakage alarm detects leakage, it activates the drainage assembly to extract the leaking liquid.

[0009] Furthermore, the protective cover includes a liquid collection tank, which is disposed on the bottom surface of the protective cover and recessed outward, and leaked liquid flows into the liquid collection tank from the bottom surface of the protective cover.

[0010] Furthermore, the drainage assembly includes a drainage hole, a drainage pump, and a drainage pipe. The drainage hole is located on the end face of the machine base, the drainage pump is located at the drainage hole, and one end of the drainage pipe is connected to the collection tank, while the other end is connected to the drainage hole.

[0011] Furthermore, the drainage assembly includes a vent hole, which is disposed on the end face of the base and communicates with the cavity.

[0012] Furthermore, the leakage alarm is signal-connected to the drainage assembly. When the leakage alarm detects that the leakage in the collection tank exceeds a preset value, the leakage alarm sends a signal to control the pump to start and open the vent.

[0013] Furthermore, a shaft extension end cover is installed on the end face of the base, and the leakage alarm is installed on the shaft extension end cover and corresponds to the liquid collection tank.

[0014] Furthermore, the skeleton oil seal is provided in two, and the two skeleton oil seals are stacked vertically along the axial direction, with grease filling the space between the two skeleton oil seals.

[0015] Furthermore, the end face of the base is provided with a stop, a sealing ring is installed inside the stop, and the protective cover is radially positioned in conjunction with the stop.

[0016] This utility model has the following technical effects: by setting a protective cover, a cavity is formed between the protective cover and the end face of the base, forming a leakage buffer zone and reducing the impact of liquid leakage on the inside of the motor; a leakage alarm is set in the cavity to monitor the leakage situation in real time and provide timely warning when leakage occurs; the leakage signal emitted by the leakage alarm controls the opening of the drainage component to realize the automatic discharge of the leaked liquid; and the sealing effect of the motor shaft head is improved by setting a double-layer skeleton oil seal. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a vertical motor shaft sealing device in one embodiment of the present invention;

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Oil seal with skeleton; 2. Grease; 3. Protective cover; 4. Leakage alarm; 5. Suction pipe; 6. Collection tank; 7. Suction hole; 8. Shaft extension end cover. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0022] like Figure 1 As shown, a vertical motor shaft sealing device is disclosed. The motor includes a motor shaft and a base end face. A protective cover 3 is installed on the base end face. A cavity is provided between the protective cover 3 and the base end face. A leakage alarm 4 is installed in the cavity. The protective cover 3 is provided with a mounting groove for installing a skeleton oil seal 1. After the motor shaft passes through the protective cover 3, the skeleton oil seal 1 seals the motor shaft. The device also includes a drainage assembly. After the leakage alarm 4 detects leakage, it activates the drainage assembly to extract the leaked liquid.

[0023] In this embodiment, at the motor shaft extension end, the motor base includes a base end face, a shaft extension end cover 8 is installed on the base end face, a bearing assembly is installed on the shaft extension end cover 8, the motor shaft passes through the bearing assembly and extends out, and the bearing assembly is used to support the motor shaft.

[0024] To better protect and seal the motor, a protective cover 3 is installed on the end face of the base. The end face of the base has a stop, and the protective cover 3 is radially fitted with the stop for positioning. To improve the sealing performance between the protective cover 3 and the end face of the base, a sealing ring is installed inside the stop. The protective cover 3 is formed by the bottom surface and side walls, creating a cavity between the protective cover 3 and the end face of the base after installation. This cavity serves as a buffer zone, draining leaked liquid before it enters the motor, thus delaying damage to the motor from leakage.

[0025] To improve the sealing effect of the motor shaft head, the protective cover 3 is provided with an installation groove. With the bottom surface of the protective cover 3 as a horizontal reference, the installation groove is formed by the inward indentation of the bottom surface of the protective cover 3. The installation groove is used to install the skeleton oil seal 1. There are two skeleton oil seals 1, which are stacked up and down along the axial direction. The space between the two skeleton oil seals 1 is filled with grease 2. After the motor shaft passes through the protective cover 3, it is sealed by the skeleton oil seal 1.

[0026] To prevent the oil seal 1 from failing and to further limit leakage, a collection tank 6 is provided at the bottom of the protective cover 3. The collection tank 6 is located on the bottom surface of the protective cover 3 and is recessed outwards, allowing leaked liquid to flow into it from the bottom surface of the protective cover 3. With the bottom surface of the protective cover 3 as a horizontal reference, the height of the collection tank 6 is lower than the bottom surface of the protective cover 3 in the axial direction. Leaked liquid will automatically flow to the collection tank 6 and be collected and confined within it. One or more collection tanks 6 can be provided depending on actual needs.

[0027] To verify the sealing effect and monitor leakage, a leak alarm 4 is installed inside the cavity. In one embodiment, a shaft extension end cover 8 is installed on the end face of the base, and the leak alarm 4 is installed on the shaft extension end cover 8, corresponding to the liquid collection tank 6. When liquid leakage occurs, liquid flows from the bottom of the protective cover 3 into the liquid collection tank 6. The leak alarm 4 monitors the water level in the liquid collection tank 6 and issues an alarm when it reaches a preset value. Depending on actual needs, the leak alarm 4 can be any one or more combinations of a float-type liquid level sensor, a capacitive liquid level sensor, a photoelectric liquid level sensor, and a resistive / conductive sensor. The installation position can also be selected to be installed on the side wall of the protective cover 3. The leak alarm 4 and its installation position in this embodiment are not intended to limit the technical solution of this application.

[0028] In existing technologies, leakage occurs after seal failure, and manual intervention is required to drain the liquid that seeps into the motor; it cannot be automatically discharged. In this embodiment, the vertical motor shaft sealing device further includes a drainage assembly, which comprises a suction hole 7, a suction pump, and a suction pipe 5. The suction hole 7 is located on the end face of the base, the suction pump is located at the suction hole 7, and one end of the suction pipe 5 is connected to a collection tank 6, while the other end is connected to the suction hole 7. In one possible embodiment, the suction hole 7 is located on the side wall of the end face of the base and communicates with the cavity. The suction pump is an independent external component or integrated with the motor. One or more drainage assemblies can be installed according to actual needs and the arrangement of the collection tank 6.

[0029] The drain assembly also includes an exhaust port, which is located on the end face of the base and communicates with the cavity. In one possible embodiment, the exhaust port is located on the side wall of the end face of the base and is arranged side by side with the liquid extraction port 7. The exhaust port solves the pressure difference generated during liquid extraction and prevents vacuuming.

[0030] Leakage alarm 4 is connected to the drainage assembly via a signal connection. When leakage alarm 4 detects that the leakage in the collection tank 6 exceeds a preset value, it sends a signal to control the pump to start and open the vent. After the leaked liquid is discharged, the alarm is deactivated, and the drainage assembly stops working. By installing leakage alarm 4 in the cavity, leakage can be monitored in real time, and timely warnings can be issued when leakage occurs. The leakage signal emitted by leakage alarm 4 controls the opening of the drainage assembly, achieving automatic discharge of leaked liquid and reducing damage to the motor.

[0031] In the embodiments disclosed in this application, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0032] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A vertical motor shaft head seal apparatus, characterized by, The motor includes a motor shaft and a base end face. A protective cover is installed on the base end face. A cavity is provided between the protective cover and the base end face. A leakage alarm is installed in the cavity. The protective cover is provided with a mounting groove for installing a skeleton oil seal. After the motor shaft passes through the protective cover, the skeleton oil seal seals the motor shaft. The motor also includes a drainage assembly. After the leakage alarm detects a leakage, it activates the drainage assembly to extract the leaking liquid.

2. The vertical motor shaft head seal apparatus of claim 1, wherein, The protective cover includes a liquid collection tank, which is disposed on the bottom surface of the protective cover and is recessed outward, and leaked liquid flows into the liquid collection tank from the bottom surface of the protective cover.

3. The vertical motor shaft head seal apparatus of claim 2, wherein, The drainage assembly includes a drainage hole, a drainage pump, and a drainage pipe. The drainage hole is located on the end face of the machine base, the drainage pump is located at the drainage hole, and one end of the drainage pipe is connected to the collection tank, while the other end is connected to the drainage hole.

4. The vertical motor shaft head seal apparatus of claim 3, wherein, The drainage assembly includes a vent hole, which is disposed on the end face of the base and communicates with the cavity.

5. The vertical motor shaft head seal apparatus of claim 4, wherein, The leakage alarm is connected to the drainage assembly. When the leakage alarm detects that the leakage in the collection tank exceeds a preset value, the leakage alarm sends a signal to control the pump to start and open the vent.

6. The vertical motor shaft head seal apparatus of claim 5, wherein, A shaft extension end cover is installed on the end face of the base, and the leakage alarm is installed on the shaft extension end cover and corresponds to the liquid collection tank.

7. The vertical motor shaft head seal apparatus of claim 1, wherein, The skeleton oil seal is configured as two, and the two skeleton oil seals are stacked vertically along the axial direction, with grease filling the space between the two skeleton oil seals.

8. The vertical motor shaft head seal apparatus of claim 1, wherein, The end face of the base is provided with a stop, a sealing ring is installed on the inner side of the stop, and the protective cover is positioned radially in conjunction with the stop.

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