Protective cover for rotating speed sensor

Abstract

The utility model discloses a protective cover for a rotating speed sensor, relates to the technical field of rotating speed sensors, and mainly aims to avoid monitoring inaccuracy of the rotating speed sensor due to jamming of pulverized coal. According to the main technical scheme, the protective cover for the rotating speed sensor comprises an elastic cover body, a first sealing ring and a second sealing ring, the elastic cover body is provided with a large head end and a small head end, the small head end wraps a bearing end of the rotating speed sensor, and the large head end wraps a shell of the rotating speed sensor; the first sealing ring is arranged on the inner side of the large head end; the second sealing ring is arranged on the inner side of the small head end; wherein the side face of the large-head end shaft is provided with an axial inclination angle, and the side face of the large-head end shaft is provided with threads used for screwing a nut.

Description

Technical Field

[0001] This utility model relates to the field of speed sensor technology, and in particular to a protective cover for speed sensors. Background Technology

[0002] In coal-fired boiler units, the coal feeder is an important upstream device among boiler auxiliary equipment. This device is generally arranged between the raw coal hopper and the coal mill, and can evenly feed the amount of raw coal from the raw coal hopper into the coal mill according to the coal load requirements.

[0003] The coal feeder is equipped with a conveyor belt for metering. Underneath the conveyor belt is a high-precision electronic belt scale weighing device. This device has two sensors: a load cell and a speed sensor.

[0004] The speed sensors of the coal feeder are all installed inside the coal feeder. The bearing of this sensor is protected by only one mechanical oil seal. As a result, the bearing of the speed sensor gets stuck after coal powder enters, causing inaccurate fuel delivery monitoring and affecting the automatic control of the unit load. Utility Model Content

[0005] In view of this, the present invention provides a protective cover for a speed sensor, the main purpose of which is to prevent the speed sensor from malfunctioning due to coal dust jamming.

[0006] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0007] This utility model provides a protective cover for a speed sensor, which includes: an elastic cover body, a first sealing ring, and a second sealing ring;

[0008] The elastic cover has a large end and a small end. The small end is wrapped around the bearing end of the speed sensor, and the large end is wrapped around the housing of the speed sensor.

[0009] The first sealing ring is disposed on the inner side of the large end;

[0010] The second sealing ring is disposed on the inner side of the small end;

[0011] The large end shaft side has an axial tilt angle and a thread for engaging the nut.

[0012] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0013] Optionally, the inner side of the large end is provided with a groove, and the first sealing ring is disposed in the groove.

[0014] Optionally, the inner wall of the groove is fixedly connected to the outer edge of the first retaining ring, and the first sealing ring is correspondingly engaged with the inner edge of the first retaining ring.

[0015] Optionally, the inner side of the large end is further provided with an annular inclined surface, which is located outside the groove.

[0016] Optionally, it also includes a flange, the inner edge of which is fixedly connected to the axial side of the elastic cover, and the flange has multiple through holes evenly distributed around its circumference.

[0017] Optionally, the axial tilt angle is the elevation angle of the opening toward the flange.

[0018] Optionally, the axial tilt angle is less than 5°.

[0019] Optionally, the elastic cover is made of nylon.

[0020] By employing the above technical solution, this utility model has at least the following advantages:

[0021] When using this protective cover, insert the bearing end of the speed sensor into the elastic cover from the large end, so that the bearing end of the sensor is in contact with the inner surface of the small end. Then, screw the nut into the thread on the axial side of the elastic cover, so that the nut moves in the direction of increasing outer diameter of the elastic cover. This causes the nut to form radial compression on the large end of the elastic cover. In this way, the first sealing ring gradually fits tightly against the housing of the speed sensor, forming a seal on the axial side of the speed sensor housing and preventing the cover from detaching from the housing of the speed sensor. The second sealing ring is set on the inner side of the small end, so that the second sealing ring covers the bearing end face of the transfer sensor.

[0022] The above settings isolate the bearing end of the speed sensor from the coal dust, preventing external coal dust from jamming the speed sensor bearing and thus avoiding speed sensor malfunction. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a protective cover for a speed sensor provided in an embodiment of this utility model;

[0024] Figure 2 for Figure 1 Enlarged view of section A.

[0025] The reference numerals in the accompanying drawings include: elastic cover 1, bearing end 2, housing 3, first sealing ring 4, second sealing ring 5, nut 6, first retaining ring 7, annular inclined surface 8, flange 9, and through hole 10. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a protective cover for a speed sensor, which includes: an elastic cover 1, a first sealing ring 4, and a second sealing ring 5;

[0029] The elastic cover 1 has a large end and a small end. The small end is wrapped around the bearing end 2 of the speed sensor, and the large end is wrapped around the housing 3 of the speed sensor.

[0030] The first sealing ring 4 is disposed on the inner side of the large end;

[0031] The second sealing ring 5 is disposed on the inner side of the small end;

[0032] The large end shaft side has an axial tilt angle and a thread for engaging the nut 6.

[0033] The working process of a protective cover for a speed sensor is as follows:

[0034] When using this protective cover, insert the bearing end 2 of the speed sensor into the elastic cover 1 from the large end, so that the bearing end 2 of the sensor fits against the inner surface of the small end. Then, screw the nut 6 into the thread on the side of the elastic cover 1, so that the nut 6 moves in the direction of increasing outer diameter of the elastic cover 1, thereby forming radial compression on the large end of the elastic cover 1. In this way, the first sealing ring 4 gradually fits tightly against the housing 3 of the speed sensor, forming a seal on the side of the housing 3 of the speed sensor, and also preventing the cover from detaching from the housing 3 of the speed sensor. The second sealing ring 5 is set on the inner side of the small end, so that the second sealing ring 5 covers the bearing end 2 of the transfer sensor.

[0035] The above settings isolate the bearing end 2 of the speed sensor from the coal dust, preventing external coal dust from jamming the speed sensor bearing and thus avoiding inaccurate speed sensor monitoring.

[0036] In a specific embodiment, a groove is provided on the inner side of the large end, and the first sealing ring 4 is disposed in the groove.

[0037] In this embodiment, specifically, the first sealing ring 4 is disposed in the groove, which improves the positional stability of the first sealing ring 4 on the inner side of the large end. During the process of the large end of the elastic cover 1 being squeezed by the nut 6, the first sealing ring 4 is not easy to shift to the outside of the groove, thus ensuring the sealing performance of the first sealing ring 4 on the periphery of the speed sensor housing 3.

[0038] In a specific embodiment, the inner sidewall of the groove is fixedly connected to the outer edge of the first retaining ring 7, and the first sealing ring 4 is correspondingly engaged with the inner edge of the first retaining ring 7.

[0039] In this embodiment, specifically, the first retaining ring 7 divides the groove into an inner groove and an outer groove. During the process of the large end of the elastic cover 1 being radially compressed and contracted by the tightened nut 6, a part of the first sealing ring 4 is located in the inner groove, and the other part of the first sealing ring 4 is located in the outer groove, which further enhances the relative positional stability of the first sealing ring 4 and the groove.

[0040] like Figure 2 As shown in the specific embodiment, the inner side of the large end is also provided with an annular inclined surface 8, which is located on the outside of the groove.

[0041] In this embodiment, specifically, during the process of the large end of the elastic cover 1 being radially compressed and contracted by the tightened nut 6, there is a gap between the annular inclined surface 8 and the peripheral side of the speed sensor housing 3, providing room for the inner side of the large end to tighten and abut against the speed sensor housing 3.

[0042] In a specific embodiment, it also includes a flange 9, the inner edge of which is fixedly connected to the axial side of the elastic cover 1, and the flange 9 has a plurality of through holes 10 evenly distributed around its circumference.

[0043] In this embodiment, specifically, multiple through holes 10 can be used to pass bolts through, facilitating the use of bolts to fix the elastic cover 1 and the speed sensor inside the coal feeder.

[0044] In a specific embodiment, the axial tilt angle is the elevation angle of the opening toward the flange 9.

[0045] In this embodiment, when using this protective cover, the axial tilt angle is the elevation angle of the opening towards the flange 9. The diameter of the large end of the elastic cover 1 is smaller than the inner diameter of the flange 9. When tightening the nut 6, the nut 6 moves from the large end towards the flange 9, and the radial pressure of the nut 6 on the elastic cover 1 gradually increases, causing the large end of the elastic cover 1 to be squeezed and the inner diameter to shrink, thereby improving the sealing effect.

[0046] In a specific implementation, the axial tilt angle is less than 5°.

[0047] In this embodiment, specifically, the axial tilt angle is less than 5°. During the process of the nut 6 moving axially along the elastic cover 1, the rate of increase of the radial compressive force of the nut 6 on the elastic cover 1 will not be too large, thus avoiding damage to the elastic cover 1 due to the compressive force of the nut 6.

[0048] In a specific embodiment, the elastic cover 1 is made of nylon material.

[0049] In this embodiment, specifically, the nylon elastic cover 1 has good wear resistance, elasticity, and self-lubricating properties, preventing the nut 6 from repeatedly squeezing the elastic cover 1 and causing damage to the elastic cover 1. At the same time, the nylon elastic cover 1 also has corresponding mechanical strength.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A protective cover for a speed sensor, characterized in that, include: An elastic cover has a large end and a small end. The small end is wrapped around the bearing end of the speed sensor, and the large end is wrapped around the housing of the speed sensor. The first sealing ring is disposed on the inner side of the large end; The second sealing ring is disposed inside the small end; The large end shaft side has an axial tilt angle and a thread for engaging the nut.

2. The protective cover for a speed sensor according to claim 1, characterized in that, The inner side of the large end is provided with a groove, and the first sealing ring is disposed in the groove.

3. The protective cover for a speed sensor according to claim 2, characterized in that, The inner wall of the groove is fixedly connected to the outer edge of the first retaining ring, and the first sealing ring is correspondingly engaged with the inner edge of the first retaining ring.

4. The protective cover for a speed sensor according to claim 2, characterized in that, The inner side of the large end is also provided with an annular inclined surface, which is located outside the groove.

5. The protective cover for a speed sensor according to claim 1, characterized in that, It also includes a flange, the inner edge of which is fixedly connected to the axial side of the elastic cover, and the flange has multiple through holes evenly distributed around its circumference.

6. The protective cover for a speed sensor according to claim 5, characterized in that, The axial tilt angle is the elevation angle of the opening towards the flange.

7. The protective cover for a speed sensor according to claim 6, characterized in that, The axial tilt angle is less than 5°.

8. The protective cover for a speed sensor according to any one of claims 1 to 7, characterized in that, The elastic cover is made of nylon.

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