CN201209597Y - Installation structure of eddy current displacement sensor - Google Patents

Abstract

The utility model discloses a mounting structure of an eddy current displacement sensor which is easy to adjust the axial position of the sensor during installation. The structure includes a fixing seat, a through hole is formed on the fixing seat, an axially limited and rotatable adjustment sleeve is nested on the hole wall of the through hole, a screw hole coaxial with the rotating axis of the adjustment sleeve is formed on the adjustment sleeve, and the threaded outer layer of the eddy current displacement sensor is matched with the thread of the screw hole; a rotation-stopping device of the adjustment sleeve is arranged on the fixing seat. Since the sensor does not rotate during the adjustment process, there is no need to disconnect the cable, and the adjustment work can be completed quickly. The mounting structure of the eddy current displacement sensor is particularly suitable for use in high-speed equipment such as centrifugal compressors.

Description

Installation structure of eddy current displacement sensor

technical field

The utility model relates to an installation structure of a sensor, in particular to an installation structure of an eddy current displacement sensor in a centrifugal compressor.

Background technique

At present, non-contact eddy current displacement sensors are usually installed on high-speed equipment such as centrifugal compressors to implement online monitoring of bearing bush vibration. The eddy current displacement sensor has the advantages of non-contact measurement, wide linear range and high sensitivity. As shown in Fig. 1 , the existing eddy current displacement sensor includes a main body, the main body is covered with a threaded outer layer, the front end of the main body is provided with a measuring head, and the tail end is connected with a cable. The eddy current displacement sensor is installed in the fixed seat, and the fixed seat is fixed on the upper side of the thrust shoe of the centrifugal compressor through screws. Screw it into the screw hole of the fixing seat and then fix it with a lock nut.

The installation structure of the above-mentioned eddy current displacement sensor makes it very troublesome to adjust and lock the sensor position during the installation process of the sensor: in the process of screwing the eddy current displacement sensor into the screw hole, the axial position of the sensor must be judged by visual inspection. After the axial position of the sensor is appropriate, connect the cable at the end to check whether it meets the technical requirements. If the technical requirements cannot be met, disconnect the cable and rotate the sensor again to adjust its axial position until the sensor is adjusted to a proper position. Location. Then, use the lock nut to fix the eddy current displacement sensor. When the lock nut is locked, due to the relative axial displacement between the lock nut and the thread of the eddy current displacement sensor, the distance between the sensor and the journal changes slightly, resulting in adjustment results that cannot meet the technical requirements and need to be readjusted and locked. The above-mentioned installation process is time-consuming and labor-intensive, which affects production efficiency.

Utility model content

The technical problem to be solved by the utility model is to provide an installation structure of the eddy current displacement sensor which is easy to adjust the axial position of the sensor during installation.

The technical solution used to solve the above technical problems is: the installation structure of the eddy current displacement sensor, including a fixed seat, a through hole is opened on the fixed seat, and an axially limited and rotatable adjustment sleeve is nested on the wall of the through hole. The adjusting sleeve is provided with a screw hole coaxial with the rotation axis of the adjusting sleeve, and the outer layer of the thread of the eddy current displacement sensor matches the thread of the screw hole; the fixing seat is provided with an anti-rotation device of the adjusting sleeve.

As a preferred solution of the above technical solution, the anti-rotation device adopts a slit extending to the wall of the through hole on the fixed seat, and the slit divides the seat body of the fixed seat into a clamp-shaped structure that can be opened and closed, and the fixed seat is provided with a control clamp. The locking device for the tension of the type structure.

As a preferred solution of the above technical solution, the locking device adopts a locking screw, and the locking screw passes through the cutout to connect the clamps on both sides of the clamp structure.

As an improvement, the adjustment sleeve adopts an elastic structure that can shrink the diameter of the screw hole.

As a preferred solution of the above technical solution, the side wall of the adjustment sleeve is provided with several openings extending from one end of the adjustment sleeve along the axial direction of the screw hole.

As an improvement, the adjusting sleeve is fixed in the axial direction of the through hole through the limiting structure.

As a preferred solution of the above technical solution, the position-limiting structure includes a position-limiting groove opened on the outer surface of the adjustment sleeve, and the wall of the through hole extends into the position-limiting groove.

The beneficial effects of the utility model are: the utility model utilizes the principle of screw transmission, and when adjusting, one hand holds the upper part of the sensor or the cable to prevent the sensor from rotating, and the other hand rotates the adjustment sleeve. There will be no axial displacement on the wall of the hole, so when the adjusting sleeve is turned, the sensor will do telescopic movement in the screw hole of the adjusting sleeve, thereby adjusting the axial position of the sensor; The rotating device fixes the adjustment sleeve to complete the installation of the sensor. Since the sensor does not rotate during the adjustment process, the adjustment work can be completed quickly without disconnecting the cable.

Description of drawings

FIG. 1 is a schematic diagram of an installation structure of an existing eddy current displacement sensor.

Fig. 2 is a schematic diagram of the installation structure of the eddy current displacement sensor of the present invention.

Fig. 3 is a cross-sectional view along A-A in Fig. 2 .

Fig. 4 is an exploded schematic view of the installation structure of the eddy current displacement sensor of the present invention.

The marks in the figure are: cable 1, thread outer layer 2, lock nut 3, main body 4, fixing seat 5, contact 6, screw 7, adjustment sleeve 8, limit groove 9, locking screw 10, opening 11, cutout 12, screw hole 13, through hole 14.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Fig. 1 , the existing eddy current displacement sensor includes a main body 4, on which a threaded outer layer 2 is sleeved, a measuring head 6 is arranged at the front end of the main body 4, and a cable 1 is connected to the tail end. The installation structure of the existing eddy current displacement sensor is as follows: the main body 4 is installed in the fixed seat 5, and the fixed seat 5 is fixed on the upper side of the thrust shoe of the centrifugal compressor through the screw 7. To adapt the threaded hole, the threaded outer layer 2 of the eddy current displacement sensor is screwed into the threaded hole of the fixing seat 5 and then fixed by the lock nut 3 . The installation structure of the existing eddy current displacement sensor makes the adjustment and locking of the sensor position very troublesome when the sensor is installed on the centrifugal compressor.

The installation structure of the eddy current displacement sensor of the present invention as shown in Figures 2 to 4 includes a fixed seat 5, and a through hole 14 is opened on the fixed seat 5, and an axial limit is nested on the wall of the through hole 14 and can be The rotating adjustment sleeve 8 has a screw hole 13 coaxial with the rotation axis of the adjustment sleeve 8 on the adjustment sleeve 8, and the threaded outer layer 2 of the eddy current displacement sensor is adapted to the thread of the screw hole 13; the fixed seat 5 is provided with Adjust the anti-rotation device of sleeve 8. When the sensor is installed and adjusted, one hand holds the upper part of the sensor or the cable 1 to prevent the sensor from rotating, and the other hand rotates the adjustment sleeve 8. Since the adjustment sleeve 8 is nested on the wall of the through hole 14 in the fixed seat 5, it will not Axial displacement occurs, so when the adjustment sleeve 8 is rotated, the sensor will perform telescopic movement in the screw hole 13 of the adjustment sleeve 8, thereby adjusting the axial position of the sensor; Set 8 fixed, complete the installation of the sensor. In this way, the sensor does not rotate during the adjustment process, so the adjustment of the axial position of the sensor can be quickly and effectively completed without disconnecting the cable 1 .

As shown in Figures 2 to 4, as a specific structure of the anti-rotation device, the anti-rotation device can be provided with a slit 12 extending to the wall of the through hole 14 on the fixed seat 5, and the notch 12 divides the body of the fixed seat 5 into A clamp-type structure that can be opened and closed, and a locking device that controls the opening and closing degree of the clamp-shaped structure is provided on the fixing seat 5 . When the locking device is adjusted so that the pincer structure tends to close up, the aperture of the through hole 14 shrinks, and the holding force of the hole wall of the through hole 14 to the adjustment sleeve 8 increases accordingly, and then the adjustment sleeve 8 is fixed. This anti-rotation method is not easy to affect the eddy current displacement sensor.

Wherein, the locking device may adopt a locking screw 10, and the locking screw 10 passes through the cutout 12 to connect the clamps on both sides of the clamp structure. As shown in FIG. 3 , the clamps on both sides of the clamp structure are actually the parts on the fixing base 5 that are respectively located on the upper and lower sides of the cutout 12 . By rotating the locking screw 10, the jaws on both sides of the pincer structure can move towards or away from each other, so that the pincer structure can be opened and closed.

As shown in Figures 2 to 4, when the axial position of the eddy current displacement sensor is adjusted and the adjustment sleeve 8 is fixed, in order to prevent the eddy current displacement sensor from rotating in the screw hole 13 of the adjustment sleeve 8 during production and operation, the axial position of the eddy current displacement sensor When the position changes, the adjusting sleeve 8 adopts an elastic structure that can shrink the aperture of the screw hole 13 . When the adjustment sleeve 8 adopts an elastic structure that can shrink the aperture of the screw hole 13, when the locking device is adjusted to make the pincer structure tend to close up, the holding force of the hole wall of the through hole 14 on the adjustment sleeve 8 is along the direction of the through hole 14. The radial direction of the eddy current displacement sensor is transmitted to the adjustment sleeve 8, so that the adjustment sleeve 8 is elastically deformed, and finally the diameter of the screw hole 13 is shrunk, and the screw hole 13 tightly hugs the thread outer layer 2 of the eddy current displacement sensor to prevent the rotation of the flow displacement sensor. Since the clamping force is transmitted along the radial direction of the screw hole 13, the sensor will not be displaced or deformed in the axial direction during the elastic deformation process of the adjusting sleeve 8, ensuring the accuracy of the position.

As shown in FIG. 3 and FIG. 4 , there are several openings 11 extending from one end of the adjustment sleeve 8 along the axial direction of the screw hole 13 on the side wall of the adjustment sleeve 8 . Like this, just make whole set 8 form the elastic structure that can make the hole diameter of screw hole 13 shrink. Wherein, the number of openings 11 can be set according to the material of the adjustment sleeve 8 .

As shown in FIG. 2 and FIG. 4 , in order to prevent the axial displacement of the adjustment sleeve 8 along the through hole 14 , the adjustment sleeve 8 is fixed in the axial direction of the through hole 14 through a limiting structure. The limit structure in the figure includes a limit groove 9 opened on the outer surface of the adjustment sleeve 8 , and the hole wall of the through hole 14 extends into the limit groove 9 . The adjustment sleeve 8 is loaded into the fixing seat 5 by opening the through hole 14 .

Claims (7)

1. The mounting structure of [claim 1] eddy displacement sensor, comprise fixed base (5), it is characterized in that: have through hole (14) on the fixed base (5), be nested with axial limiting and rotatable adjustment cover (8) on the hole wall of through hole (14), adjust the screw (13) that has and adjust the rotating shaft coaxle of cover (8) on the cover (8), the screw thread skin (2) of eddy displacement sensor is suitable with the screw thread of screw (13); Fixed base (5) is provided with the whirl-stop device of adjusting cover (8).
2. The mounting structure of [claim 2] eddy displacement sensor as claimed in claim 1, it is characterized in that: whirl-stop device adopts offers the otch (12) that extends to through hole (14) hole wall on fixed base (5), otch (12) with fixed base (5) but pedestal be divided into the forceps type structure of opening and closing, fixed base (5) is provided with the locking device of control forceps type structure opening and closing degree.
3. The mounting structure of [claim 3] eddy displacement sensor as claimed in claim 2 is characterized in that: locking device adopts lock screw (10), lock screw (10) to pass otch (12) the both sides clamp of forceps type structure is connected.
4. [claim 4] is characterized in that as the mounting structure of claim 2 or 3 described eddy displacement sensors: adjust the elastic structure that cover (8) adopts the aperture contraction that can make screw (13).
5. The mounting structure of [claim 5] stream displacement transducer as claimed in claim 4 is characterized in that: adjust and to have some the axially extended openings (11) from an end of adjusting cover (8) along screw (13) on the sidewall of cover (8).
6. [claim 6] is characterized in that according to the mounting structure of any described eddy displacement sensor of claim in 1～3: it is fixing axially going up of through hole (14) by limit structure to adjust cover (8).
7. The mounting structure of [claim 7] eddy displacement sensor as claimed in claim 6 is characterized in that: limit structure comprises out that the hole wall of through hole (14) stretches in the restraining groove (9) at the restraining groove (9) of adjusting cover (8) outer surface.

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