level gauge

Abstract

The application relates to a material level meter, which comprises a junction box, a shaft, a shaft protection pipe and a vane, a motor is installed in the junction box, the power output end of the motor is connected with one end of the shaft, the vane is fixed to the other end of the shaft, the shaft protection pipe is sleeved on the outside of the shaft, and a dust blocking structure is arranged on the inner side of the shaft protection pipe and close to the vane. The material level meter can prevent dust from entering the space between the shaft and the shaft protection pipe, so that the shaft cannot rotate, and thus the error switch signal caused by the dust is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material level detection device, in particular to a material level meter. BACKGROUND

[0002] In the industrial production of electric power, steel, metallurgy, cement, petroleum chemical industry, etc., material level meter is often needed to measure high temperature materials. The working principle of the existing material level meter is to use a permanent magnet motor to drive the rotation of the blade. When the detected material rises to the position of the blade, the rotation of the blade is blocked, and the resistance is transmitted to the detection device in the junction box. The detection device outputs a switch signal to the outside and cuts off the power supply to stop the rotation of the blade.

[0003] In actual production, the shaft protection pipe is generally provided on the material level meter to protect the shaft of the material level meter. Since the industrial production of electric power, steel, metallurgy, cement, petroleum chemical industry, etc. may be accompanied by strong dust phenomenon, dust is easily entered between the shaft protection pipe and the shaft of the material level meter. After the dust accumulated between the shaft protection pipe and the shaft is combined with the water vapor in the air and solidified, the shaft is easily blocked to make the shaft unable to rotate, resulting in an incorrect switch signal. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a material level meter to solve the above technical problems.

[0005] In order to achieve the above application purpose, one technical scheme provided by the present application is as follows:

[0006] A material level meter, comprising a junction box, a shaft, a shaft protection pipe and a blade, a motor is installed in the junction box, a power output end of the motor is connected with one end of the shaft, the blade is fixed to the other end of the shaft, the shaft protection pipe is sleeved on the outside of the shaft, and a dust blocking structure is arranged on the inner side of the shaft protection pipe close to the blade.

[0007] Preferably, a flange is connected with one end of the shaft protection pipe close to the junction box, the flange is sleeved on the shaft, and a heat sink is arranged between the flange and the junction box.

[0008] Preferably, the heat sink comprises a heat pipe and a plurality of heat dissipation fins, the plurality of heat dissipation fins are connected with the heat pipe, the heat pipe is sleeved on the shaft, one end of the heat pipe is connected with the flange, and the other end of the heat pipe is connected with the junction box.

[0009] Preferably, the heat pipe and the flange are detachably connected.

[0010] Preferably, the dust blocking structure comprises solid oil, and the solid oil is filled between the shaft and the shaft protection pipe.

[0011] Preferably, the shaft protection pipe is provided with a groove near one end of the blade, a sealing ring is arranged in the groove, the sealing ring is sleeved on the shaft, the shaft protection pipe is provided with a blocking part near one end of the blade, an elastic body is arranged between the blocking part and the sealing ring, and the elastic body abuts the sealing ring against the groove bottom.

[0012] Preferably, the groove bottom is provided with an annular groove, a piston is arranged in the annular groove, one end of the air inlet channel away from the flange is located at the groove bottom of the annular groove, and one end of the air return channel away from the flange is located at the groove bottom of the annular groove.

[0013] Preferably, the sealing ring comprises a ring body sleeved on the shaft and an elastic ring sleeved outside the ring body, the elastic ring is in contact with the side wall of the groove, and the elastic body is in contact with the sealing ring.

[0014] Preferably, the elastic body is a spring or a spring piece, and the elastic ring is a rubber ring or a silica gel ring.

[0015] The material level meter provided by the application can prevent dust from entering between the shaft and the shaft protection pipe and from clamping the shaft to make the shaft unable to rotate, thereby effectively preventing the generation of an error switch signal. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure schematic view of a material level meter is shown;

[0017] Figure 2 A structure schematic view of a heat sink is shown; Figure 1

[0018] Figure 3 A partial sectional view of the heat sink is shown; Figure 1

[0019] Figure 4 A partial enlarged view of the heat sink is shown; Figure 3

[0020] Figure 5 A deformation view of the heat sink is shown; Figure 4

[0021] Figure 6 A structure schematic view of a sealing ring is shown;

[0022] Markings in the drawings:​​​​

[0023] Blade 1, shaft 2, shaft protection tube 3, groove 3-1, sealing ring 3-2, ring body 3-21, elastic ring 3-22, blocking part 3-3, elastic body 3-4, air inlet channel 3-5, air return channel 3-6, piston 3-7, flange 4, radiator 5, radiator pipe 5-1, radiator fin 5-2, junction box 6. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Embodiment 1, please refer to Figure 1 The present application provides a kind of material level meter, including junction box 6, shaft 2, shaft protection tube 3 and blade 1, motor is installed in the junction box, the power output end (that is motor shaft) of the motor is connected with one end of the shaft, the blade is fixed to the other end of the shaft, the shaft protection tube is set in the outside of the shaft, the flange 4 is connected to one end of the shaft protection tube close to the junction box, and the flange is set on the shaft;Radiators 5 are provided between the flange and the junction box;Solid oil is filled between the shaft and the shaft protection tube close to the blade, and solid oil can generally use solid lubricating oil.

[0026] The material level meter is used, and the material level meter is fixed on the equipment shell by the flange, one side of the shaft protection tube of the material level meter passes through the hole reserved in the equipment to be detected, so that the detected material can be output signal when rising to the blade position in the object, and the material level meter has the following advantages:

[0027] 1, by filling solid oil between the shaft and the shaft protection tube, prevent dust from entering between the shaft and the shaft protection tube and jam the shaft so that the shaft cannot rotate, thereby effectively preventing the generation of false switching signal;

[0028] 2, by setting radiator, it is convenient for material level meter to radiate heat, prevent heat from accumulating in the shaft protection tube and junction box, especially prevent heat from accumulating in the junction box, to protect electronic components in the junction box.

[0029] In the present application, the radiator can use the existing structure of the radiator, please refer to Figure 2In the embodiment, the heat sink comprises a heat pipe 5-1 and a plurality of heat dissipation fins 5-2, and the plurality of heat dissipation fins are connected with the heat pipe; the heat pipe sleeve is arranged on the shaft, one end of the heat pipe sleeve is connected with the flange, and the other end of the heat pipe sleeve is connected with the junction box; preferably, the heat pipe is detachably connected with the flange, for example, the heat pipe is connected with the flange through threads, so that the material level meter is convenient to disassemble and assemble; in the embodiment, the flange and the heat sink are both made of aluminum alloy.

[0030] As a preferred embodiment, refer to Figure 3 and Figure 4, the shaft protection pipe is provided with a groove 3-1 near one end of the blade, a sealing ring 3-2 is arranged in the groove, and the sealing ring is sleeved on the shaft; the shaft protection pipe is provided with a blocking part 3-3 near one end of the blade, the general blocking part is an annular blocking part, an elastic body 3-4 is arranged between the annular blocking part and the sealing ring, the elastic body can be a spring or a spring piece, and the elastic body abuts the sealing ring against the groove bottom (the right end of the groove in the figure); the shaft protection pipe is provided with an air inlet channel 3-5 and an air return channel 3-6, one end of the air inlet channel is located on the side of the flange close to the junction box, and the other end is located on the groove bottom; one end of the air return channel is located on the side of the flange close to the junction box, and the other end is located on the groove bottom; the groove bottom is provided with an annular groove, and a piston 3-7 is arranged in the annular groove; the end of the air inlet channel away from the flange is located on the groove bottom of the annular groove (the right end of the annular groove in the figure); and the end of the air return channel away from the flange is located on the groove bottom of the annular groove. When the structure is used, a fan or the like air supply device can be connected on the side of the flange close to the junction box, the air supply device supplies air to the air inlet channel, when the airflow reaches the piston position, the piston is pushed to move to the left, the sealing ring moves to the left, the piston moves to the left to unblock the air return channel, the air continues to enter from the air inlet channel and is discharged from the air return channel, so that part of the heat of the shaft protection pipe is taken away, and when the air is discharged through the flange, the air passes through the heat sink, so that the heat sink can dissipate heat; when the sealing ring moves to the left, the inner side surface moves relative to the shaft in the length direction of the shaft, so that dust attached to the shaft close to the sealing ring is pushed to the left each time, so that the dust is not easy to accumulate on the groove bottom, so that the dust is not easy to enter between the shaft and the shaft protection pipe, and since the shaft is provided with a solid oil seal at the groove bottom, water vapor is not easy to enter, so that the dust body is further prevented from being condensed between the shaft and the shaft protection pipe; when the sealing ring moves to the left, a small negative pressure is generated between the sealing ring and the groove bottom, so that the solid oil between the sealing ring and the shaft and the sealing oil between the shaft protection pipe and the shaft are subjected to a small negative pressure attraction, so that when the air supply device stops supplying air, the sealing ring returns to the original position under the action of the elastic force of the elastic body, and in this process, the small negative pressure attraction makes the solid oil between the sealing ring and the shaft more easily kept in the inner side of the sealing ring. In the application, the sealing ring can be an annular piston, in the embodiment, referring to Figure 6 , the sealing ring comprises a ring body 3-21 sleeved on the shaft and an elastic ring 3-22 sleeved outside the ring body, when manufactured, a groove can be arranged circumferentially on the ring body to clamp the elastic ring in the groove, or the inner side of the elastic ring can be directly adhered to the ring body, which is a connection manner familiar to those skilled in the art, the elastic ring is arranged in contact with the side wall of the groove to form a seal with the inner wall of the groove; the position where the elastic body contacts the sealing ring forms a buffer for the sealing ring, in the embodiment, the elastic ring can be a rubber ring or a silica gel ring.

[0031] In the above embodiments, the blocking part can also be configured as follows: at least two blocking parts are evenly arranged in the circumferential direction, and each blocking part is provided with an elastic body. This is something that those skilled in the art can easily conceive of, and will not be elaborated here.

[0032] Example 2, please refer to Figure 3 and Figure 5 This application provides a level gauge, including a junction box 6, a shaft 2, a shaft protection tube 3, and a vane 1. A motor is installed inside the junction box, and the power output end of the motor (i.e., the motor shaft) is connected to one end of the shaft. The vane is fixed to the other end of the shaft. The shaft protection tube is sleeved on the outside of the shaft, and a flange 4 is connected to the end of the shaft protection tube near the junction box. The flange is sleeved on the shaft. A radiator 5 is provided between the flange and the junction box. A groove 3-1 is provided at the end of the shaft protection tube near the vane, and a sealing ring 3-2 is provided in the groove. A sealing ring is fitted onto the shaft; a blocking part 3-3 is provided at one end of the shaft protection tube near the blade, and an elastic body 3-4 is provided between the blocking part and the sealing ring. The elastic body can be a spring or a sheet, and the elastic body holds the sealing ring against the bottom of the groove (the right end of the groove in the figure); an air inlet channel 3-5 and a return air channel 3-6 are provided inside the shaft protection tube. One end of the air inlet channel is located on the side of the flange near the junction box, and the other end is located at the bottom of the groove; one end of the return air channel is located on the side of the flange near the junction box, and the other end is located at the bottom of the groove. In this embodiment, the sealing ring and radiator can use the structure in Embodiment 1. The main difference between this embodiment and Embodiment 1 is that the solid oil, annular groove, and corresponding annular piston structure are not provided. In this way, during use, when the air supply device supplies air to the air inlet channel, when the airflow reaches the sealing ring position, it pushes the sealing ring to move to the left. When the piston moves to the left to release the blockage of the return channel, a small amount of airflow will be blown to the left through the gap between the sealing ring and the shaft, preventing dust from entering the shaft protection tube and the shaft through the bottom of the groove of the sealing ring and the groove.

[0033] It should be noted that the above is merely an example of the present invention. Any dust-blocking structure provided on the inner side of the shaft protection tube near the blade to prevent dust from accumulating between the shaft protection tube and the shaft falls within the inventive concept of the present invention.

[0034] It should be noted that the use of "a," "an," "the" and "at least one" are open-ended descriptions of "one or more," which cover the interpretation where more than one of the singular elements are present. The articles "a," "an," "the" and "at least one" are to be construed to be open-ended, allowing for there to be none, one or more elements. By using the term "or" in the

[0035] It will be readily understood that the terms "on," "above," and "over," in the disclosure, are to be construed as meaning "directly on," but also including the meaning of "on," "above," or "over" with intervening features or layers, and that "above" or "over" includes the meaning of "above" or "over" without intervening features or layers (i.e., directly on).

[0036] Furthermore, spatially relative terms, such as "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0037] It should be noted that the terms "first," "second," and the like, as used herein do not necessarily have an ordinal meaning. Rather, such terms are used to distinguish one element from another. Moreover, terms such as "including," "having," or "containing" or any other similar term are intended to be inclusive of the stated elements or process steps, but not to the exclusion of other elements or process steps. Additionally, the term "comprising" is used herein to mean that the methods and compositions include the recited elements, but not excluding others.

[0038] While embodiments of the application have been shown and described, it is to be understood that various modifications can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is to be circumscribed by the appended claims and their equivalents.

Claims

1. A material level meter, comprising a junction box (6), a shaft (2), a shaft protection tube (3) and a vane (1), a motor is installed in the junction box, a power output end of the motor is connected with one end of the shaft, the vane is fixed to the other end of the shaft, and the shaft protection tube is sleeved outside the shaft, characterized in that, The inner side of the shaft protection pipe is provided with a dust blocking structure near the blade, and the dust blocking structure comprises solid oil filled between the shaft and the shaft protection pipe; The shaft protection pipe is connected with a flange (4) near one end of the junction box, and the flange is sleeved on the shaft; A heat sink (5) is arranged between the flange and the junction box; The shaft protection pipe is provided with a groove (3-1) near one end of the blade, and a sealing ring (3-2) is arranged in the groove and sleeved on the shaft; The shaft protection pipe is provided with a blocking part (3-3) near one end of the blade, and an elastic body (3-4) is arranged between the blocking part and the sealing ring, and the elastic body abuts the sealing ring against the groove bottom; An air inlet channel (3-5) and an air return channel (3-6) are arranged in the shaft protection pipe, one end of the air inlet channel is located on the side of the flange near the junction box, and the other end is located on the groove bottom; One end of the air return channel is located on the side of the flange near the junction box, and the other end is located on the groove bottom; The groove bottom is provided with an annular groove, and a piston (3-7) is arranged in the annular groove; The end of the air inlet channel away from the flange is located on the groove bottom of the annular groove; The end of the air return channel away from the flange is located on the groove bottom of the annular groove.

2. A level gauge according to claim 1, characterised in that The heat sink comprises a heat dissipation pipe (5-1) and a plurality of heat dissipation fins (5-2), and the plurality of heat dissipation fins are connected with the heat dissipation pipe; The heat dissipation pipe is sleeved on the shaft, one end of the heat dissipation pipe is connected with the flange, and the other end of the heat dissipation pipe is connected with the junction box.

3. A level gauge according to claim 2, wherein The heat dissipation pipe is detachably connected with the flange.

4. A level gauge according to claim 1, wherein The sealing ring comprises a ring body (3-21) sleeved on the shaft and an elastic ring (3-22) sleeved outside the ring body, and the elastic ring is in contact with the side wall of the groove; The position where the elastic body is in contact with the sealing ring.

5. A level gauge according to claim 4, wherein The elastic body is a spring or a spring piece; The elastic ring is a rubber ring or a silica gel ring.

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