CN217385543U - Explosion-proof type rotating speed measuring instrument - Google Patents

Abstract

Disclosed is an explosion-proof type rotation speed measuring instrument, which comprises: the rotating speed measuring device comprises a rotating speed measuring unit for measuring rotating speed and an explosion-proof shell with an accommodating cavity, wherein the rotating speed measuring unit is accommodated in the accommodating cavity so as to reduce the explosion risk of the rotating speed measuring instrument in the installation or use process. The explosion-proof housing further comprises a housing body, at least one sealing joint and a mounting panel, wherein the housing body forms the accommodating cavity, wherein the accommodating cavity is provided with an opening, the operating part is arranged on the mounting panel after the rotating speed measuring unit is mounted on the mounting panel, the rotating speed measuring unit is accommodated in the accommodating cavity, the mounting panel is mounted on the opening so that the rotating speed measuring unit can be operated through the operating part, the at least one sealing joint is connected with the at least one wiring terminal, and the at least one sealing joint is arranged between the housing body and the at least one wiring terminal.

Description

Explosion-proof type rotating speed measuring instrument

Technical Field

The application relates to the field of rotating speed measuring instruments, in particular to an explosion-proof rotating speed measuring instrument.

Background

The rotating speed measuring instrument is mainly used for measuring parameters such as rotating speed, linear speed and frequency of rotating machinery (such as a motor), and is widely applied to the fields of automobiles, industrial measurement and control, wind power generation and the like. For example, a rotation speed measuring instrument may be used to measure the rotation speed of a motor of a numerical control machine tool to monitor the operation state of the numerical control machine tool.

It should be noted that in the actual industry, the tachometer is prone to generate electric sparks during installation or operation, and damage to its own structure or surrounding equipment. In addition, the rotating speed measuring instrument is increased in temperature during operation, and explosion is easy to occur when the temperature is too high. Particularly when a flammable medium (e.g., flammable and explosive gas, oil) is present in the working environment, the electric spark and high temperature are liable to cause the surrounding flammable medium to explode.

Explosion accidents cause immeasurable loss to personal safety and property safety, and in order to ensure the safe development, the Chinese security competent department is strengthening the safety production responsibility and increasing the industrial safety supervision, and products entering the market need to meet the explosion-proof standard.

Therefore, it is desirable to provide an explosion-proof solution to reduce the risk of explosion during installation or use of the tachometer.

Disclosure of Invention

One advantage of the present application is that an explosion-proof rotational speed measuring instrument is provided, wherein the rotational speed measuring instrument is provided with an explosion-proof housing for the rotational speed measuring unit to reduce the risk of explosion of the rotational speed measuring instrument during installation or use.

Another advantage of the present application is to provide an explosion-proof type rotation speed measuring instrument, wherein, in some embodiments of the present application, an explosion-proof housing of the rotation speed measuring instrument can not only reduce the risk of an explosion occurring outside the explosion-proof type rotation speed measuring instrument by isolating a fire source (i.e., a rotation speed measuring unit) to block conditions and an explosion propagation path generated by the explosion, but also reduce the risk of the explosion by improving heat dissipation performance of the fire source to improve the safety of the explosion-proof type rotation speed measuring instrument.

To achieve at least one of the above advantages or other advantages and objects, there is provided an explosion-proof type rotation speed measuring instrument including:

a rotation speed measuring unit for measuring a rotation speed; and

and the explosion-proof shell is provided with an accommodating cavity, and the rotating speed measuring unit is accommodated in the accommodating cavity.

In the explosion-proof formula speed measuring instrument of this application, the rotational speed measuring unit include the main part with set up in a main part's an at least binding post, explosion-proof casing is including forming the shell body in holding chamber with be used for connecting an at least sealing joint of a binding post at least, an at least sealing joint set up in between shell body and an at least binding post.

The rotational speed measuring unit further includes an operating portion operatively coupled to the body portion, and the outer case further includes a visible window corresponding to the operating portion.

In the explosion-proof type rotation speed measuring instrument of the application, the outer casing comprises a lower casing and an upper casing opposite to the lower casing, and the visual window is formed in the upper casing in a sealing mode.

In the explosion-proof formula speed measuring instrument of this application, explosion-proof casing is further including form in go up the casing with installation panel between the casing down, and, set up in installation panel with coupling assembling between the rotational speed measuring unit, in order to incite somebody to action the rotational speed measuring unit install in the installation panel, coupling assembling including set up in rotational speed measuring unit's first connecting piece with set up in the installation panel with fasten in the second connecting piece of first connecting piece.

In the explosion-proof type rotating speed measuring instrument, the first connecting piece and the second connecting piece are mutually matched and form at least one pair of buckle pairs so as to be mutually fastened in a clamping mode.

In the explosion-proof type rotation speed measuring instrument of the application, the explosion-proof housing further comprises an inner support arranged between the outer housing and the rotation speed measuring unit and/or the installation panel, and the rotation speed measuring unit is kept in the outer housing through the inner support.

In the explosion-proof formula tachometry appearance of this application, explosion-proof casing further including form in inside the outer casing inner liner, the inner liner is made by the heat conduction material.

In the explosion-proof type rotation speed measuring instrument of the present application, the inner liner includes a buffer layer made of an elastic material.

In the explosion-proof type rotational speed measuring instrument of the application, explosion-proof type rotational speed measuring instrument includes: a rotation speed measuring unit for measuring a rotation speed; the explosion-proof shell is provided with an accommodating cavity, and the rotating speed measuring unit is accommodated in the accommodating cavity; the anti-explosion shell comprises an outer shell forming the accommodating cavity and at least one sealing joint used for connecting the at least one wiring terminal, and the at least one sealing joint is arranged between the outer shell and the at least one wiring terminal; the rotational speed measuring unit further includes an operating portion operatively coupled to the body portion, the outer housing further including a visible window corresponding to the operating portion; the outer shell comprises a lower shell and an upper shell opposite to the lower shell, and the visible window is hermetically formed in the upper shell; the explosion-proof housing further comprises a mounting panel formed between the upper housing and the lower housing, and a connecting assembly disposed between the mounting panel and the rotation speed measuring unit to mount the rotation speed measuring unit on the mounting panel, the connecting assembly comprising a first connecting member disposed on the rotation speed measuring unit and a second connecting member disposed on the mounting panel and fastened to the first connecting member; the first connecting piece and the second connecting piece are mutually matched to form at least one pair of buckle pairs so as to be mutually fastened in a clamping manner; the explosion proof housing further comprises an inner support disposed between the outer housing and the rotational speed measurement unit and/or the mounting panel, the rotational speed measurement unit being retained within the outer housing by the inner support; the explosion-proof shell further comprises an inner lining layer formed in the outer shell, and the inner lining layer is made of heat conducting materials; the inner liner includes a buffer layer made of an elastic material.

Further objects and advantages of the present application will become apparent from a reading of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

These and/or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:

fig. 1 illustrates a perspective view schematic diagram of an explosion-proof tachometer according to an embodiment of the present application.

Fig. 2 illustrates a first schematic plan view of an explosion-proof rotational speed measuring instrument according to an embodiment of the present application.

Fig. 3 shows a second schematic plan view of an explosion-proof rotational speed measuring device according to an exemplary embodiment of the present disclosure.

Fig. 4 illustrates a third schematic plan view of the explosion-proof type rotation speed measuring instrument according to the embodiment of the present application.

Fig. 5 illustrates an explosion-proof schematic diagram of an explosion-proof tachometer according to an embodiment of the present application.

Fig. 6 illustrates a first partial schematic view of a burst-proof rotational speed measuring instrument according to an embodiment of the application.

Fig. 7 shows a second partially schematic illustration of an explosion-proof rotational speed measuring device according to an exemplary embodiment of the application.

Fig. 8 illustrates a first partially disassembled schematic view of an explosion proof rotational speed measurement instrument according to an embodiment of the present application.

Fig. 9 illustrates a second partially disassembled schematic view of the explosion-proof rotational speed measuring instrument according to the embodiment of the present application.

Fig. 10 illustrates a schematic view of a connection assembly of an explosion-proof tachometer according to an embodiment of the present application.

Detailed Description

The terms and words used in the following specification and claims are not limited to the literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the application. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present application are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

It is understood that the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., that a quantity of one element may be one in one embodiment, while a quantity of another element may be plural in other embodiments, and the terms "a" and "an" should not be interpreted as limiting the quantity.

While ordinal numbers such as "first," "second," etc., will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another component. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the teachings of the inventive concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

Summary of the application

As described above, in the actual industry, the tachometer is prone to generate electric sparks during installation or operation, and damage to its own structure or surrounding equipment. In addition, the rotating speed measuring instrument is increased in temperature during operation, and explosion is easy to occur when the temperature is too high. Particularly when a flammable medium (e.g., flammable and explosive gas, oil) is present in the working environment, the electric spark and high temperature are liable to cause the surrounding flammable medium to explode.

In view of the above problems, the present application provides an explosion-proof housing for a rotation speed measuring instrument to reduce the risk of explosion of the rotation speed measuring instrument during installation or operation by isolating an ignition source, which is liable to generate electric sparks, from a high temperature source (i.e., a rotation speed measuring unit). Specifically, by isolating the rotation speed measurement unit from sufficient contact with a combustible medium to block a condition of explosion generation, even if the rotation speed measurement unit explodes inside the explosion-proof housing, the risk of explosion outside the explosion-proof housing can be reduced by blocking an explosion propagation path by isolating the rotation speed measurement unit. Further, in some embodiments of the present application, the risk of explosion is reduced by improving the heat dissipation properties of the fire source.

Based on this, this application has proposed an explosion-proof formula rotational speed measuring apparatu, it includes: a rotational speed measuring unit for measuring a rotational speed; and the explosion-proof shell is provided with an accommodating cavity, wherein the rotating speed measuring unit is accommodated in the accommodating cavity.

Having described the general principles of the present application, various non-limiting embodiments of the present application will now be described with reference to the accompanying drawings.

Having described the basic principles of the present application, various non-limiting embodiments of the present application will now be described with reference to the accompanying drawings.

Schematic explosion-proof type rotating speed measuring instrument

As shown in fig. 1 to 5, an explosion-proof type rotation speed measuring instrument according to an embodiment of the present application is illustrated, wherein the explosion-proof type rotation speed measuring instrument includes a rotation speed measuring unit 10 for measuring a rotation speed, and an explosion-proof housing 20 having a receiving chamber 201, wherein the rotation speed measuring unit 10 is received in the receiving chamber 201 to reduce an explosion risk.

Specifically, in the present embodiment, the unit for measuring the rotational speed includes a main body portion 11 and an operating portion 12 operatively coupled to the main body portion 11, as shown in fig. 8 and 9. The main body portion 11 is configured to receive a command signal from the operation portion 12, measure the rotation speed of a target object, and output specified data (e.g., rotation speed measurement result, operating temperature, count cycle, operation mode) to the operation portion 12. The operation portion 12 is used as a portion capable of interacting with a user to issue an instruction signal to the main body portion 11 and to receive data output from the main body portion 11. The operating part 12 comprises at least one operating control part for triggering an instruction and at least one display for displaying specified information corresponding to specified data. In a specific example of the present application, the manipulation control is implemented as a manipulation button, and the display is implemented as a digital display screen.

As shown in fig. 6 and 7, the rotation speed measuring unit 10 further includes at least one connection terminal 13 provided to the main body portion 11 and adapted to be connected to a wire cable for connection with an external device through the connection terminal 13 or for connection to ground through the connection terminal 13. In one specific example of the application, the rotation speed measuring unit 10 may be communicatively connected to seven external output devices (e.g., a notebook computer) through the at least one connection terminal 13.

The rotation speed measuring unit 10 is easy to generate electric sparks during installation or operation, and damage the structure of the rotation speed measuring unit or surrounding equipment. Also, the rotation speed measuring unit 10 is increased in temperature during operation, and is liable to be exploded when the temperature is excessively high. Particularly when a flammable medium (e.g., flammable and explosive gas, oil) is present in the working environment, the electric spark and high temperature are liable to cause the surrounding flammable medium to explode. In the embodiment of the present application, the rotation speed measuring unit 10 is disposed in the explosion-proof housing 20 in a hermetically sealed manner to reduce the explosion risk of the rotation speed measuring instrument during installation or operation by isolating the ignition source, which is liable to generate electric sparks, from the high temperature source (i.e., the rotation speed measuring unit 10).

Specifically, as shown in fig. 5, the explosion-proof housing 20 includes an outer housing 21 forming the accommodating chamber 201, the outer housing 21 includes a lower housing 211 and an upper housing 212 opposite to the lower housing 211, the upper housing 212 is communicated with the lower housing 211 and jointly forms the accommodating chamber 201, and the rotation speed measuring unit 10 is held between the upper housing 212 and the lower housing 211.

More specifically, the explosion-proof housing 20 further includes a mounting panel 213 formed between the upper housing 212 and the lower housing 211, and the rotation speed measuring unit 10 is held between the upper housing 212 and the lower housing 211 so as to be mounted to the mounting panel 213, wherein the mounting panel 213 is fixed between the upper housing 212 and the lower housing 211. In a specific example of the present application, the mounting panel 213 is fixed between the upper housing 212 and the lower housing 211 in a manner of being formed on the upper housing 212, in this specific example, the upper housing 212 includes a base and a cover 2122 extending upward from an outer circumference of the base in a longitudinal direction, the mounting panel 213 is formed on the base, and the mounting panel 213 may be integrally formed on the base or may be mounted on the base, which is not limited by the present application. In another specific example of the present application, the mounting panel 213 is fixed between the upper housing 212 and the lower housing 211 in a manner of being formed on the lower housing 211, in this specific example, the lower housing 211 includes an upper end wall, the mounting panel 213 is formed on the upper end wall, and the mounting panel 213 may be integrally formed on the upper end wall or may be mounted on the upper end wall, which is not limited in this application. In still another specific example of the present application, the mounting panel 213 is formed between the upper case 212 and the lower case 211 in such a manner as to be suspended between the upper case 212 and the lower case 211.

The specific embodiment of the rotation speed measuring unit 10 mounted on the mounting panel 213 is not limited by the present application, and in a specific example of the present application, the upper housing 212 forms an upper receiving cavity, the lower housing 211 forms a lower receiving cavity, and the mounting panel 213 has a mounting opening 202 communicating with the upper receiving cavity and the lower receiving cavity. The mounting opening 202 allows only a portion of the rotation speed measuring unit 10 to pass therethrough, and during the process of passing the rotation speed measuring unit 10 through the mounting opening 202, a portion of the rotation speed measuring unit 10 passes through the mounting opening 202 and is located on a first side of the mounting panel 213, and another portion of the rotation speed measuring unit 10 is latched to the mounting opening 2124 and is located on a second side opposite to the first side.

As shown in fig. 8 and 9, in one embodiment of the present application, the shape of the main body portion 11 of the rotation speed measuring unit 10 is consistent with the size of the mounting opening 202, and the cross-sectional area of the main body portion 11 is equal to the area of the mounting opening 202. The size of the operation portion 12 is larger than that of the main body portion 11, and the mounting opening 202 allows the main body portion 11 to pass therethrough. The main body part 11 of the rotation speed measuring unit 10 is positioned at a first side of the mounting panel 213 and received in a lower receiving cavity formed by the lower case 211, and the operation part 12 of the rotation speed measuring unit 10 is positioned at a second side of the mounting panel 213 and received in an upper case 212 formed by the upper case 212.

In order to stably mount the rotation speed measuring unit 10 to the mounting panel 213, the explosion-proof housing 20 further includes a connection assembly 22 disposed between the mounting panel 213 and the rotation speed measuring unit 10. In the embodiment of the present application, the connection assembly 22 includes a first connection member 221 provided to the rotation speed measuring unit 10 and a second connection member 222 provided to the mounting panel 213 and fastened to the first connection member 221. The first connector 221 and the second connector 222 are engaged with each other and form at least one pair of snap-fit pairs to be fastened to each other by a snap-fit manner to fasten the rotation speed measuring unit 10 to the mounting panel 213.

As shown in fig. 10, in an embodiment of the present application, the first connector 221 includes at least one engaging opening 2211 formed in the rotation speed measuring unit 10. The second connector 222 includes a carrier portion 2221 and a locking portion 2222 protrudingly formed on the carrier portion 2221, wherein the locking portion 2222 includes a protruding arm extending outward from the carrier portion 2221 and a locking arm extending transversely from the protruding arm, and the protruding arm and the locking arm are at a predetermined angle and form a hook-shaped structure to cooperate with the locking opening 2211 and form a locking pair.

In this embodiment, the support portion 2221 includes an outer cylindrical body 2223 and an inner tightening body 2224 provided inside the outer frame body and the outer frame body. The outer frame body is provided with an inner channel provided with an internal thread, the outer wall of the inner tightening body 2224 is provided with an external thread matched with the internal thread, the inner tightening body 2224 can be screwed into the inner channel of the outer frame body through the matching of the internal thread and the external thread, and the length of the inner tightening body 2224 is longer than that of the inner channel. When the inner tightening body 2224 is rotated in the screwing direction of the external thread, the inner tightening body 2224 located at the first side of the mounting panel 213 moves toward the mounting panel 213 to push the operating portion 12 located at the second side of the mounting panel 213 to move, so that the mounting panel 213 is caught between the operating portion 12 and the connecting assembly 22, in such a manner that the rotation speed measuring unit 10 is relatively stably mounted to the mounting panel 213.

It should be understood that the rotation speed measuring unit 10 may also be stably mounted to the mounting panel 213 by other means, and accordingly, the specific embodiment of the connection assembly 22 is not limited by the present application.

In some embodiments of the present application, the explosion proof housing 20 further includes an inner bracket 23 disposed between the outer housing 21 and the rotational speed measurement unit 10 and/or the mounting panel 213, and the rotational speed measurement unit 10 is held in the outer housing 21 by the inner bracket 23. As shown in fig. 8 and 9, in a specific example of the present application, the inner bracket 23 is fixed between the mounting panel 213 and the lower case 211. In this specific example, the inner bracket 23 includes a first fixing arm and a second fixing arm fixed to the mounting panel 213, and a cross arm extending between the first fixing arm and the second fixing arm, and the inner bracket 23 is fixed to the lower case 211 in such a manner that the cross arm thereof is fixed to the inner wall of the lower case 211, so as to hold the rotation speed measurement unit 10 mounted to the mounting panel 213 within the outer case 21. Specifically, the cross arm may be fixed to the lower case 211 by screws, may be fixed to the lower case 211 by fitting the cross arm into a groove of the lower case 211, or may be fixed to the lower case 211 by another method, and this is not a limitation of the present application, and the specific structure of the inner bracket 23 is also not a limitation of the present application.

In the present embodiment, the explosion-proof housing 20 further includes at least one sealing joint 24 (not shown) for connecting at least one connection terminal 13 of the rotation speed measuring unit 10, and the sealing joint 24 may be implemented as a glan joint. The at least one sealing joint 24 is disposed between the outer housing 21 and the at least one connection terminal 13, so as to ensure the sealing performance of the explosion-proof housing 20 while the connection terminal 13 is communicably connected to an external device through a wire cable or is connected to the ground, so as to isolate the rotation speed measurement unit 10 from sufficient contact with a flammable medium to block a condition caused by an explosion, and even if the rotation speed measurement unit 10 explodes inside the explosion-proof housing 20, the explosion propagation path can be blocked by isolating the rotation speed measurement unit 10 to reduce the risk of an explosion outside the explosion-proof housing 20.

In the present embodiment, the outer case 21 further includes a visible window 2125 corresponding to the operation portion 12 to ensure visibility to the operation portion 12 while ensuring sealability of the explosion-proof case 20. In a specific example of the present application, the viewing window 2125 is hermetically formed at the upper case 212, and the viewing window 2125 is made of a transparent material. In this specific example, the cover 2122 of the upper housing 212 has an opening 2124 corresponding to the operating portion 12, the upper housing 212 further includes a cover 2123 covering the opening 2124, and at least a part of an upper end surface of the cover 2123 is made of a transparent material to form the visual window 2125. In one embodiment of the present application, a first thread is provided on an inner wall of the opening 2124 of the cover 2122, a second thread matching the first thread is provided on an outer circumferential wall of the cover 2123, and the cover 2123 is disposed on the cover 2122 via the first thread and the second thread. In another embodiment of the present application, the cover 2123 is implemented as a cover plate made of a transparent material, the cover plate forms the viewing window 2125, and the cover plate is fitted into the opening 2124 or is integrally formed with the opening 2124.

In some embodiments of the present application, the risk of explosion is reduced by improving the heat dissipation properties of the fire source. In a specific example of the present application, explosion-proof housing 20 further includes be formed at the inner liner of shell body 21, the inner liner is made by the good heat conduction material of heat conductivity to improve explosion-proof formula rotational speed measuring apparatu's heat dispersion avoids the high temperature to cause the explosion. In some specific embodiments, the inner liner is disposed at a preset position in the outer housing 21 to form a preset heat dissipation path, so as to optimize the heat dissipation performance of the explosion-proof rotation speed measuring instrument.

It is worth mentioning that in this specific example, the inner liner layer includes a buffer layer made of an elastic material to reduce damage to the explosion-proof housing 20 when the rotation speed measurement unit 10 generates an electric spark or an explosion, thereby reducing external damage to the explosion-proof rotation speed measurement instrument.

Method for assembling schematic rotating speed measuring instrument

According to another aspect of the present application, the present application proposes a method of assembling a rotation speed measuring instrument, comprising: s110, providing an upper shell, a lower shell, an installation panel, an inner support and a rotating speed measuring unit; s120, forming the inner bracket on the mounting panel; s130, mounting the rotating speed measuring unit on the mounting panel to form a unit to be assembled; and S140, assembling the unit to be assembled between the upper shell and the lower shell to form the rotating speed measuring instrument.

In step S110, an upper housing 212, a lower housing 211, a mounting panel 213, an inner bracket 23, and a rotational speed measuring unit 10 are provided. Specifically, the upper housing 212 forms an upper receiving chamber, at least a portion of an upper end surface of the upper housing 212 forms a viewing window 2125, and the viewing window 2125 is made of a transparent material. More specifically, the upper housing 212 includes a base and a shroud 2122 extending longitudinally upward from an outer periphery of the base. In some embodiments of the present application, the cover 2122 has an opening 2124, the upper housing 212 further includes a cover 2123 covering the opening 2124, and at least a portion of the cover 2123 forms the viewing window 2125. The lower case 211 forms a lower receiving chamber. The inner bracket 23 and the rotation speed measuring unit 10 are adapted to be fixed to the mounting panel 213.

In some embodiments of the present application, the inside of the upper housing 212 and/or the lower housing 211 is provided with an inner liner, and the inner liner is made of a heat conductive material with good thermal conductivity, so as to improve the heat dissipation performance of the explosion-proof type rotation speed measuring instrument and avoid explosion caused by over-high temperature. In some specific embodiments, the inner liner is disposed at a predetermined position in the outer housing 21 to form a predetermined heat dissipation path, so as to optimize the heat dissipation performance of the explosion-proof rotation speed measuring instrument.

In some embodiments of the application, the inner liner includes a buffer layer made of an elastic material to reduce damage to the explosion-proof housing 20 when the rotation speed measurement unit 10 generates an electric spark or an explosion, thereby reducing external damage to the explosion-proof rotation speed measurement instrument.

In step S120, the inner bracket 23 is formed on the mounting panel 213. Specifically, the inner bracket 23 includes a first fixing arm and a second fixing arm, and a cross arm extending between the first fixing arm and the second fixing arm, wherein a distance between the first fixing arm and the second fixing arm is smaller than or equal to a maximum size of an outer periphery of the mounting panel 213. The inner bracket 23 may be fixed to the mounting panel 213 by the first and second fixing arms thereof being fixed to the mounting panel 213. Specifically, the first fixing arm may be fixed to the mounting panel 213 by a screw, a solder, or other structures, which is not limited in this application.

In some embodiments of the present application, the inner bracket 23 and the mounting panel 213 are integrally formed, and the inner bracket 23 does not need to be fixed to the mounting panel 213 by other members.

In step S130, the rotation speed measuring unit 10 is mounted to the mounting panel 213 to form a unit to be assembled. Specifically, the rotation speed measuring unit 10 includes a main body portion 11 and an operating portion 12 operatively coupled to the main body portion 11, the mounting panel 213 has a mounting opening 202, the rotation speed measuring unit 10 is passed through the mounting opening 202, and the mounting panel 213, the inner bracket 23 and the rotation speed measuring unit 10 form the unit to be assembled.

In some embodiments of the present application, the shape of the main body portion 11 of the rotation speed measuring unit 10 is consistent with the size of the mounting opening 202, and the cross-sectional area of the main body portion 11 is equal to the area of the mounting opening 202. The size of the operation portion 12 is larger than that of the main body portion 11, and the mounting opening 202 allows the main body portion 11 to pass therethrough. In the process of inserting the rotation speed measuring unit 10 through the mounting opening 202, the main body portion 11 is inserted through the mounting opening 202 and positioned on a first side of the mounting panel 213, and the operating portion 12 is latched to the mounting opening 2124 and positioned on a second side opposite to the first side.

In some embodiments of the present application, in order to stably mount the rotation speed measuring unit 10 to the mounting panel 213, the rotation speed measuring unit 10 is mounted to the mounting panel 213 by a connection assembly 22. The connection assembly 22 includes a first connector 221 provided to the rotation speed measuring unit 10 and a second connector 222 provided to the mounting panel 213 and fastened to the first connector 221. The first connector 221 and the second connector 222 are engaged with each other and form at least one pair of snap-fit pairs to be fastened to each other by a snap-fit manner to fasten the rotation speed measuring unit 10 to the mounting panel 213.

In one embodiment of the present application, the first connector 221 includes at least one engaging opening 2211 formed in the rotation speed measuring unit 10. The second connector 222 includes a carrier portion 2221 and a locking portion 2222 protrudingly formed on the carrier portion 2221, wherein the locking portion 2222 includes a protruding arm extending outward from the carrier portion 2221 and a locking arm extending transversely from the protruding arm, and the protruding arm and the locking arm are at a predetermined angle and form a hook-shaped structure to cooperate with the locking opening 2211 and form a locking pair.

In this embodiment, the carrier portion 2221 includes an outer cylinder 2223 and an inner tightening body 2224 provided inside the outer frame and the inner frame. The outer frame body is provided with an inner channel with an internal thread, the outer wall of the inner tightening body 2224 is provided with an external thread matched with the internal thread, the inner tightening body 2224 can be screwed into the inner channel of the outer frame body through the matching of the internal thread and the external thread, and the length of the inner tightening body 2224 is longer than that of the inner channel. When the inner tightening body 2224 is rotated in the screwing direction of the external thread, the inner tightening body 2224 located at the first side of the mounting panel 213 moves toward the mounting panel 213 to push the operating portion 12 located at the second side of the mounting panel 213 to move, so that the mounting panel 213 is caught between the operating portion 12 and the connecting assembly 22, in such a manner that the rotation speed measuring unit 10 is relatively stably mounted to the mounting panel 213.

In step S140, the unit to be assembled is assembled between the upper housing 212 and the lower housing 211 to form a rotation speed measuring instrument. Specifically, the inner bracket 23 of the unit to be assembled is fixed to the lower case 211, and the mounting panel 213 of the unit to be assembled is fixed to the upper case 212, or the lower case 211, or between the upper case 212 and the lower case 211. In the process of assembling the unit to be assembled between the upper housing 212 and the lower housing 211, the upper receiving cavity of the upper housing 212 and the lower receiving cavity of the lower housing 211 are communicated to form a new receiving cavity, so as to form the explosion-proof housing 20, and the rotation speed measuring instrument is held in the receiving cavity 201 formed by the upper housing 212 and the lower housing 211.

In summary, an explosion-proof rotational speed measuring instrument and an assembly method thereof based on the embodiments of the present application are explained, which configures an explosion-proof housing 20 for a rotational speed measuring unit 10 to reduce the risk of explosion during installation or use of the rotational speed measuring instrument.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

Claims (9)

1. An explosion-proof formula rotational speed measuring apparatu, includes a rotational speed measuring unit and is used for measuring the rotational speed, rotational speed measuring unit includes an at least binding post and an operation part, its characterized in that includes:

an explosion-proof housing, explosion-proof housing has a holding chamber and supplies the holding rotational speed measuring unit, wherein, explosion-proof housing further includes a shell body, an at least sealing joint and an installation panel, wherein, the shell body forms the holding chamber, wherein, the holding chamber has an opening, wherein, rotational speed measuring unit is installed in behind the installation panel, operating portion set up in the installation panel, rotational speed measuring unit by the holding chamber, the installation panel be installed to the opening so that pass through operating portion operation rotational speed measuring unit, an at least sealing joint connects an at least binding post, an at least sealing joint set up in between shell body and an at least binding post.

2. The explosion proof rotational speed measuring instrument according to claim 1, wherein the outer housing further comprises a visible window corresponding to the operation portion.

3. The explosion proof type rotational speed measuring instrument according to claim 2, wherein the outer housing includes a lower housing and an upper housing opposed to the lower housing, the viewing window being sealingly formed in the upper housing.

4. The explosion proof type rotation speed measuring instrument according to claim 3, wherein a connection assembly is provided between the mounting panel and the rotation speed measuring unit to mount the rotation speed measuring unit to the mounting panel, the connection assembly including a first connection member provided to the rotation speed measuring unit and a second connection member provided to the mounting panel and fastened to the first connection member.

5. The explosion proof rotational speed measuring instrument according to claim 4, wherein the first and second connectors are engaged with each other and form at least one pair of snap-fit pairs to be fastened to each other by snap-fit.

6. The explosion proof rotational speed measuring instrument according to claim 4, wherein the explosion proof housing further comprises an inner bracket disposed between the outer housing and the rotational speed measuring unit and/or the mounting panel, the rotational speed measuring unit being held within the outer housing by the inner bracket.

7. The explosion proof rotational speed measuring instrument according to claim 6, wherein the explosion proof housing further comprises an inner liner formed within the outer housing, the inner liner being made of a thermally conductive material.

8. The explosion proof rotational speed measuring instrument according to claim 7, wherein the inner liner includes a buffer layer made of an elastic material.

9. An explosion-proof formula rotational speed measuring apparatu, includes a rotational speed measuring unit and is used for measuring the rotational speed, rotational speed measuring unit includes an at least binding post and an operation part, its characterized in that includes:

an explosion-proof housing having an accommodating chamber, wherein the rotation speed measuring unit is accommodated in the accommodating chamber, wherein the accommodating chamber further has an opening;

the anti-explosion shell comprises an outer shell forming the accommodating cavity and at least one sealing joint used for connecting the at least one wiring terminal, and the at least one sealing joint is arranged between the outer shell and the at least one wiring terminal; the outer housing further comprises a visible window corresponding to the operation part; the outer shell comprises a lower shell and an upper shell opposite to the lower shell, and the visual window is hermetically formed in the upper shell; the explosion-proof housing further includes a mounting panel formed between the upper housing and the lower housing, and a connection assembly provided between the mounting panel and the rotation speed measuring unit to mount the rotation speed measuring unit to the mounting panel, the operating portion being provided to a panel, the mounting panel being mounted to the opening so that the rotation speed measuring unit is operated by the operating portion, wherein the connection assembly includes a first connection member provided to the rotation speed measuring unit and a second connection member provided to the mounting panel and fastened to the first connection member; the first connecting piece and the second connecting piece are mutually matched and form at least one pair of buckle pairs so as to be mutually fastened in a clamping manner; the explosion proof housing further comprises an inner support disposed between the outer housing and the rotational speed measurement unit and/or the mounting panel, the rotational speed measurement unit being retained within the outer housing by the inner support; the explosion-proof shell further comprises an inner lining layer formed in the outer shell, and the inner lining layer is made of heat conducting materials; the inner liner includes a buffer layer made of an elastic material.

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