Transmission sealing device

Abstract

The utility model discloses a transmission sealing device which comprises a transmission shaft, a first step, a second step, a third step and a fourth step are sequentially arranged in the middle of the transmission shaft from top to bottom, the outer ring of the second step is sleeved with a base, and two rotary glyd rings are arranged between the inner ring of the base and the outer ring of the second step. A first center hole step is arranged on the upper end face of the base, a first deep groove ball bearing is embedded in the first center hole step, a check ring groove is formed in the outer side of the first step, an elastic check ring for a shaft is installed in the check ring groove, a second center hole step is arranged on the lower end face of the base, and a detachable sealing seat is arranged below the base. The lower end face of the detachable sealing seat is provided with a third center hole step, the third center hole step comprises a large-aperture end and a small-aperture end, a lip-shaped sealing ring is embedded in the small-aperture end, and a second deep groove ball bearing is embedded in the large-aperture end. When the transmission sealing device is used, the transmission sealing device cannot be damaged even in a long-time dynamic sealing state, and transformer oil cannot leak.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a transmission sealing device. Background Art

[0002] The existing transmission sealing device is mainly used for the sealed transmission of the reactor, and is generally installed at the bottom of the reactor to seal the transformer oil inside the reactor. During the sealing process, the transmission sealing device will not only be in a static sealing state according to the working state, but more often in a dynamic sealing state. The dynamic sealing needs to be in a long-term rotating use state. Since the two deep groove ball bearings of the current transmission sealing device are installed at a close distance, the torque generated during rotation is large, which will cause the upper and lower deep groove ball bearings to have axial runout during rotation. The axial runout of the two deep groove ball bearings will cause the lip seal ring in the transmission sealing device to be in a semi-contact state during rotation, causing the lip seal ring to be deformed or even damaged, resulting in oil leakage from the transmission sealing device. Once the transmission sealing device is damaged, the equipment needs to be returned to the factory to extract all the transformer oil before replacement, causing great economic losses.

[0003] Therefore, it is necessary to provide a transmission sealing device to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide a transmission sealing device for the deficiencies in the prior art, which will not be damaged and transformer oil will not leak even if it is in a dynamic sealing state for a long time.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A transmission sealing device comprises a transmission shaft, both ends of the transmission shaft are provided with key grooves, the middle part of the transmission shaft is provided with a first step, a second step, a third step and a fourth step from top to bottom, the outer diameters of the second, third and fourth steps decrease in sequence, the outer diameters of the first step and the fourth step are the same, the outer ring of the second step is sleeved with a base, two rotating grid rings are provided between the inner ring of the base and the outer ring of the second step, the upper end surface of the base is provided with a first center hole step, the first center hole step is embedded with a first deep groove ball bearing, the lower end surface of the first deep groove ball bearing is in abutment with the step end surface of the first center hole step, the inner ring of the first deep groove ball bearing is interference fit with the outer ring of the first step, a retaining ring groove is provided on the outer side of the first step, a shaft elastic retaining ring is installed in the retaining ring groove, the lower end surface of the shaft elastic retaining ring is in abutment with the upper end surface of the first deep groove ball bearing, the lower end surface of the base is provided with a second center hole step, a detachable sealing seat is provided under the base, and the The disassembly seal seat and the base are plugged and matched through the second center hole step, the step end face of the second center hole step is in contact with the upper end face of the removable seal seat, and the lower end face of the removable seal seat is provided with a third center hole step, the third center hole step includes a large aperture end and a small aperture end, the small aperture end of the third center hole step is embedded with a lip seal ring, the inner ring of the lip seal ring is interference fit with the outer ring of the third step, and the large aperture end of the third center hole step is embedded with a second deep groove Ball bearing, the inner ring of the second deep groove ball bearing is interference fit with the outer ring of the fourth step, the upper end face of the second deep groove ball bearing is in contact with the lower end face of the lip seal ring, the lower end face of the second deep groove ball bearing is flush with the lower end face of the removable sealing seat, the lower end faces of the second deep groove ball bearing and the removable sealing seat are fitted with the upper end face of the lower pressure plate, the upper end face of the first deep groove ball bearing is flush with the upper end face of the base, and the upper end faces of the first deep groove ball bearing and the base are fitted with the lower end face of the upper pressure plate.

[0007] Preferably, the upper pressing plate and the base are fixed by bolts, the lower pressing plate and the detachable sealing seat are fixed by bolts, and the base and the detachable sealing seat are fixed by bolts.

[0008] Preferably, an O-ring is provided between the base and the detachable sealing seat.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] 1. Increase the installation distance of the two deep groove ball bearings so that the two deep groove ball bearings are farther apart, which effectively reduces the torque at both ends of the transmission shaft, reduces the axial runout of the deep groove ball bearings, and avoids damage to the lip seal ring. Two rotating Gly rings are installed between the base and the second step. Regardless of whether it is in a static sealing or dynamic sealing state, the two-stage sealing measures and the characteristics of the rotating Gly ring itself ensure that the transmission sealing device will not leak transformer oil even if it is in a high temperature and high-speed rotation state. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the transmission shaft;

[0013] Among them, 1-transmission shaft, 101-first step, 102-second step, 103-third step, 104-fourth step, 2-base, 3-rotating Gley ring, 4-first deep groove ball bearing, 5-retaining ring groove, 6-elastic retaining ring for shaft, 7-removable sealing seat, 8-O-ring, 9-lip seal, 10-second deep groove ball bearing, 11-lower pressure plate, 12-upper pressure plate DETAILED DESCRIPTION

[0014] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0015] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixed connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0016] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0017] like Figure 1 to Figure 2As shown, a transmission sealing device comprises a transmission shaft 1, both ends of the transmission shaft are provided with keyways, the middle part of the transmission shaft is provided with a first step 101, a second step 102, a third step 103 and a fourth step 104 from top to bottom, the outer diameters of the second, third and fourth steps decrease in sequence, the outer diameters of the first step and the fourth step are the same, the outer ring of the second step is sleeved with a base 2, the base is tightly installed with the second step, two rotating gray rings 3 are provided between the inner ring of the base and the outer ring of the second step, the upper end surface of the base is provided with a first center hole step, and the first center hole step is embedded with The first deep groove ball bearing 4, the lower end face of the first deep groove ball bearing is in contact with the step end face of the first center hole step, the inner ring of the first deep groove ball bearing is interference fit with the outer ring of the first step, a retaining ring groove 5 is provided on the outer side of the first step, a shaft elastic retaining ring 6 is installed in the retaining ring groove, the lower end face of the shaft elastic retaining ring is in contact with the upper end face of the first deep groove ball bearing, the first deep groove ball bearing is fixed in the axial direction, a second center hole step is provided on the lower end face of the base, a removable sealing seat 7 is provided under the base, and the removable sealing seat is plug-fitted with the base through the second center hole step, The step end face of the second center hole step is in contact with the upper end face of the removable sealing seat, an O-ring 8 is installed between the base and the removable sealing seat, the base and the removable sealing seat are fixed by bolts, a third center hole step is provided on the lower end face of the removable sealing seat, the third center hole step includes a large aperture end and a small aperture end, a lip seal ring 9 is embedded in the small aperture end of the third center hole step, the inner ring of the lip seal ring is interference fit with the outer ring of the third step, a second deep groove ball bearing 10 is embedded in the large aperture end of the third center hole step, the second deep groove ball bearing The inner ring is interference fit with the outer ring of the fourth step, the upper end face of the second deep groove ball bearing is in contact with the lower end face of the lip seal ring, the lower end face of the second deep groove ball bearing is flush with the lower end face of the removable sealing seat, the lower end faces of the second deep groove ball bearing and the removable sealing seat are fitted with the upper end face of the lower pressure plate 11, and the lower pressure plate and the removable sealing seat are fixed by bolts, the upper end face of the first deep groove ball bearing is flush with the upper end face of the base, the upper end faces of the first deep groove ball bearing and the base are fitted with the lower end face of the upper pressure plate 12, and the lower pressure plate and the base are fixed by bolts.

[0018] The principle and use method of a transmission sealing device: using a base as an installation carrier, assembling various transmission sealing parts, installing the base and a detachable sealing seat in close cooperation, and keeping the outer diameters of the first step and the fourth step consistent, thereby ensuring that the centers of two deep groove ball bearings and a lip seal ring that are far apart can be on the same axis. The long distance between the two deep groove ball bearings effectively reduces the torque at both ends of the transmission shaft, reduces axial runout, and effectively avoids damage to the lip seal ring. Two rotating Gly rings are installed between the base and the second step. No matter in a static sealing state or a dynamic sealing state, through two-stage sealing measures and the characteristics of the rotating Gly ring itself, it is ensured that the transmission sealing device will not leak transformer oil even in a high temperature and high-speed rotation state.

[0019] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A transmission sealing device, characterized in that: The invention comprises a transmission shaft, both ends of which are provided with key grooves, a first step, a second step, a third step and a fourth step are arranged in sequence from top to bottom in the middle of the transmission shaft, the outer diameters of the second, third and fourth steps decrease in sequence, the outer diameters of the first step and the fourth step are the same, the outer ring of the second step is sleeved with a base, two rotating grid rings are arranged between the inner ring of the base and the outer ring of the second step, the upper end surface of the base is provided with a first center hole step, a first deep groove ball bearing is embedded in the first center hole step, the lower end surface of the first deep groove ball bearing is in abutment with the step end surface of the first center hole step, the inner ring of the first deep groove ball bearing is interference fit with the outer ring of the first step, a retaining ring groove is provided on the outer side of the first step, an elastic retaining ring for a shaft is installed in the retaining ring groove, the lower end surface of the elastic retaining ring for a shaft is in abutment with the upper end surface of the first deep groove ball bearing, the lower end surface of the base is provided with a second center hole step, a detachable sealing seat is arranged under the base, the detachable sealing seat The seat and the base are plug-fitted through the second center hole step, the step end face of the second center hole step is in contact with the upper end face of the removable sealing seat, and the lower end face of the removable sealing seat is provided with a third center hole step, the third center hole step includes a large aperture end and a small aperture end, the small aperture end of the third center hole step is embedded with a lip sealing ring, the inner ring of the lip sealing ring is interference fit with the outer ring of the third step, the large aperture end of the third center hole step is embedded with a second deep groove ball bearing, the inner ring of the second deep groove ball bearing is interference fit with the outer ring of the fourth step, the upper end face of the second deep groove ball bearing is in contact with the lower end face of the lip sealing ring, the lower end face of the second deep groove ball bearing is flush with the lower end face of the removable sealing seat, the lower end faces of the second deep groove ball bearing and the removable sealing seat are fitted with the upper end face of the lower pressure plate, the upper end face of the first deep groove ball bearing is flush with the upper end face of the base, and the upper end faces of the first deep groove ball bearing and the base are fitted with the lower end face of the upper pressure plate.

2. A transmission sealing device according to claim 1, characterized in that: The upper pressing plate is fixed to the base by bolts, the lower pressing plate is fixed to the detachable sealing seat by bolts, and the base is fixed to the detachable sealing seat by bolts.

3. A transmission sealing device according to claim 1, characterized in that: An O-type sealing ring is arranged between the base and the detachable sealing seat.

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