Corrugated pipe locking structure of sensor and sensor

Abstract

The utility model discloses a corrugated pipe locking structure of a sensor and the sensor, the corrugated pipe locking structure of the sensor is used for fixing a corrugated pipe, the corrugated pipe is located at the tail end of the sensor and wraps the periphery of a cable to protect the cable, and the corrugated pipe locking structure of the sensor comprises a gland seat, a gland, a sheath and a cap; the gland seat is fixed on the sensor, and a groove is formed in one end, far away from the sensor, of the gland seat; one end of the gland is arranged in the groove and is in threaded connection with the gland seat, a bulge is arranged on the periphery of the gland, and the bulge is matched with the inner groove of the corrugated pipe, so that the corrugated pipe is screwed into the gland; the cap is fixed on the outer side of the gland seat; the sheath has elasticity and is located between the cap and the corrugated pipe, so that when the cap is installed, the sheath is extruded, the sheath deforms, the gap between the gland seat and the corrugated pipe is filled, and the corrugated pipe is extruded inwards to hold the corrugated pipe tightly. According to the utility model, the sensor tail cable can be effectively protected, and the problem of fatigue breakage of the sensor tail cable is solved.

Description

Technical Field

[0001] The present application relates to the technical field of sensors, and in particular to a bellows locking structure of a sensor and a sensor. Background Art

[0002] Some sensors, such as composite sensors used in machinery, ships, rail transit and other fields, should be installed as close to the fault-prone areas as possible in order to better collect vibration, shock and temperature signals at various fault-prone locations. However, due to structural limitations, these locations often have small spaces, and traditional sensor installations are prone to interference with other components or insufficient safety distances.

[0003] The commonly used solution at present is to use the metal hose at the tail of the sensor without directly connecting it to the sensor probe, and use the small diameter and small bending radius of the cable to solve the problem of installing the sensor in a limited space. However, if the metal hose is not directly connected to the sensor probe and the cable is simply used to make a bend, the cable will be subjected to greater stress, and in harsh operating environments, there is a risk of cable fatigue and breakage.

[0004] In order to facilitate the assembly of the internal structure of the sensor, the sensor usually adopts a method of separating the base with mounting threads from the outer shell with tightened hexagon. Although this method solves the problem of internal assembly of the sensor, it also makes the sensor unable to withstand large installation torque. During the installation and disassembly process on site, it is easy for the weld between the base and the outer shell to tear and the sensor base and outer shell to separate, causing the sensor to be damaged. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a bellows locking structure of a sensor and a sensor, so that the cable at the tail of the sensor is not prone to fatigue and breakage.

[0006] The technical solution provided by the utility model is as follows:

[0007] A bellows locking structure for a sensor, used for fixing a bellows, wherein the bellows is located at the rear end of the sensor and is wrapped around the outer circumference of a cable to protect the cable, and the bellows locking structure for the sensor comprises a gland seat, a gland, a sleeve, and a cap; the gland seat is fixed on the sensor and is provided with a groove at the end away from the sensor; one end of the gland is inserted into the groove and is threadedly connected to the gland seat, a protrusion is provided on the outer circumference of the gland, and the protrusion fits the inner groove of the bellows so that the bellows can be screwed onto the gland; the cap is fixed to the outside of the gland seat; the sleeve is elastic and is located between the cap and the bellows, so that when the cap is installed, it squeezes the sleeve, the sleeve is deformed, fills the gap between the gland seat and the bellows, and squeezes the bellows inward to hold the bellows tightly.

[0008] Preferably, the cap is threadedly connected to the outer side of the gland seat and the sleeve is squeezed by tightening during installation.

[0009] Preferably, the protrusion of the gland is a spiral protrusion corresponding to the inner diameter and pitch of the bellows.

[0010] Preferably, it also includes a sealing rubber plug, which is located in the groove of the gland seat, axially between the gland and the sensor, radially between the cable and the gland seat, and is tightly connected to the cable and the gland seat to achieve sealing and waterproofing.

[0011] Preferably, a plastic gasket is further provided between the sealing rubber plug and the gland, so that during the tightening process of the gland, the gland and the plastic gasket can rotate relative to each other, and the plastic gasket will not drive the sealing rubber plug to rotate due to the rotation.

[0012] Preferably, the corrugated tube is a metal hose.

[0013] A sensor comprises the bellows locking structure of the sensor as described above. The sensor comprises a base and a shell. The base and the shell form a receiving cavity. The gland seat is fixed to the shell.

[0014] Preferably, a stop key is provided on the outer periphery of the base, and a stop groove is correspondingly provided on the inner periphery of the shell. The stop key cooperates with the stop groove to prevent relative rotation between the base and the shell due to excessive torque when the sensor is installed and tightened.

[0015] Preferably, the sensor further comprises a circuit board, the circuit board is provided with a soldering pad connected to the cable by welding, and the circuit board is located in the receiving cavity.

[0016] Preferably, the direction in which the base is installed on the housing is opposite to the direction in which the cable is installed on the housing, a fixing surface perpendicular to the mounting direction of the base is provided on the inner side of the base, and the circuit board is fixed on the fixing surface.

[0017] Preferably, a first threaded hole is provided on the fixing surface, and the circuit board is fixed to the fixing surface by installing screws.

[0018] Preferably, the base is provided with a second threaded hole, and a piezoelectric component is also provided in the accommodating cavity, and the piezoelectric component includes a locking screw, a mass block, a first insulating ceramic, a first lead-in plate, a piezoelectric ceramic, a second lead-in plate, and a second insulating ceramic. A through hole is provided in the middle of the mass block, the first insulating ceramic, the first lead-in plate, the piezoelectric ceramic, the second lead-in plate, and the second insulating ceramic, which are sequentially mounted on the locking screw, and an insulating sleeve is mounted on the locking screw, which is screwed into the second threaded hole after mounting. The first lead-in plate and the second lead-in plate are connected to the circuit board through wires.

[0019] Preferably, the direction in which the base is installed on the housing is opposite to the direction in which the cable is installed on the housing, a mounting surface parallel to the mounting direction of the base is provided on the inner side of the base, and the second threaded hole is provided on the mounting surface.

[0020] Preferably, a mounting portion is provided on the outside of the base, the mounting portion is provided with a sensor mounting thread, and the mounting portion is hollow to form a temperature sensitive element mounting space, the temperature sensitive element is arranged in the temperature sensitive element mounting space, and is connected to the circuit board through a wire.

[0021] Preferably, the base is provided with an oblique hole connecting the temperature sensitive element installation space and the receiving cavity, and the wire passes through the oblique hole from the temperature sensitive element installation space to the receiving cavity.

[0022] Compared with the prior art, the bellows locking structure and sensor of the sensor of the utility model, by setting a cover seat, a pressure cover, a sleeve and a cap, make the inner side of the bellows cooperate with the pressure cover protrusion and the outer side cooperate with the sleeve, so that the bellows is directly connected to the sensor, thereby effectively protecting the rear cable of the sensor and solving the problem of fatigue breakage of the rear cable of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a three-dimensional exploded view of the sensor of the embodiment of the utility model;

[0025] Figure 2 for Figure 1 A combined cross-sectional view of the sensor shown;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of the base of the sensor shown;

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the housing in the sensor shown;

[0028] Figure 5 for Figure 1 Schematic diagram of the structure of the pressure cover in the sensor shown.

[0029] Figure numerals: 1-front cover, 2-base, 3-housing, 4-pressure cover seat, 5-cap, 6-sheath, 7-pressure cover, 8-cable, 9-corrugated tube, 10-sealing plug, 11-plastic gasket, 12-mounting screw, 13-circuit board, 14-locking screw, 15-second insulating ceramic, 16-first lead plate, 17-piezoelectric ceramic, 18-mass block, 19-temperature sensitive element, 20-protrusion, 21-stop key, 22-stop groove, 23-assembly part, 24-protrusion, 25-fixing surface, 26-first threaded hole, 27-mounting surface, 28-second threaded hole, 29-mounting part, 30-oblique hole, DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0035] like Figures 1 to 5 As shown, an embodiment of the utility model provides a sensor, the tail end of which can be connected to a cable 8 and a corrugated tube 9 , and the corrugated tube 9 is wrapped around the outer periphery of the cable 8 to protect the cable 8 .

[0036] In this embodiment, the sensor includes a base 2, a housing 3, a circuit board 13, a piezoelectric component, a temperature sensitive element 19, and a bellows locking structure. The piezoelectric component is used to detect vibration and impact signals, and the temperature sensitive element 19 is used to detect temperature signals. Of course, in other embodiments, detection elements for detecting other signals can be provided in addition to the piezoelectric component and the temperature sensitive element 19.

[0037] The bellows locking structure is used to fix the bellows 9, including a gland seat 4, a gland 7, a sheath 6, and a cap 5. The gland seat 4 is fixed on the housing 3 of the sensor (fixed by interference crimping followed by laser welding). The gland seat 4 is cylindrical and has a groove at the end away from the sensor. The inner wall of the groove is provided with an internal thread, and the outer periphery is provided with an external thread. One end of the gland 7 is inserted into the groove, and one end thereof is provided with an external thread. The gland 7 is threadedly connected to the gland seat 4 by matching with the internal thread of the inner wall of the groove of the gland seat. The outer periphery of the gland 7 is provided with a protrusion 20 (in this embodiment, a spiral protrusion corresponding to the inner diameter and pitch of the bellows 9), which is adapted to the inner groove of the bellows 9, so that the bellows 9 is screwed onto the gland 7. The cap 5 is provided with an internal thread, which is threadedly connected to the outer side of the gland seat 4 by matching with the external thread on the outer periphery of the gland seat 4 (in other embodiments, a fixing method other than threaded connection, such as clamping, etc., can also be used). The sheath 6 is elastic and is located between the cap 5 and the corrugated tube 9, so that when the cap 5 is tightened, the sheath 6 is squeezed, the sheath 6 is deformed, fills the gap between the gland seat 4 and the corrugated tube 9, and squeezes the corrugated tube 9 inward to hold the corrugated tube 9 tightly, so that the corrugated tube 9 can withstand a certain pulling force and torsional force, ensuring that the corrugated tube 9 will not fall out during use, effectively protecting the cable 8. The gland seat 4 and the gland 7 are both provided with through holes in the center for the cable 8 to pass through.

[0038] In this embodiment, the bellows locking structure also includes a sealing rubber plug 10, which is located in the groove of the gland seat 4, axially between the gland 7 and the sensor, and radially between the cable 8 and the gland seat 4, and is tightly connected to the cable 8 and the gland seat 4 to achieve sealing and waterproofing.

[0039] In this embodiment, a plastic gasket 11 is further provided between the sealing rubber plug 10 and the gland 7. Since the plastic gasket is made of plastic, the friction between the plastic gasket and the metal gland 7 is small, and the friction between the plastic gasket and the rubber sealing rubber plug 10 is large, so that during the tightening process of the gland 7, the gland 7 and the plastic gasket 11 will rotate relative to each other, and the plastic gasket 11 will not drive the sealing rubber plug 10 to rotate due to the rotation, which can effectively prevent the cable 8 from rotating due to the rotation of the sealing rubber plug 10 when the gland 7 is tightened. After the cable 8 rotates, it may pull the pad connected to the circuit board 13, and finally cause the pad to fall off or poor contact.

[0040] In this embodiment, the base 2 and the housing 3 are press-fitted and then laser welded. A stop key 21 is provided on the outer periphery of the base 2, and a stop groove 22 is provided on the inner periphery of the housing 3. The stop key 21 cooperates with the stop groove 22 to prevent the base 2 and the housing 3 from rotating relative to each other and tearing the weld due to excessive torque when the sensor is installed and tightened.

[0041] In this embodiment, the base 2 is mounted and fixed on the housing 3, and the direction in which the base 2 is mounted on the housing 3 is opposite to the direction in which the cable 8 is mounted on the housing 3. The base 2 and the housing 3 form a receiving cavity for accommodating components such as the circuit board 13 and the piezoelectric component. The base 2 is provided with an assembly portion 23 that cooperates with the housing 3, and the inner surface of the assembly portion 23 is perpendicular to the installation direction of the base 2. A protrusion 24 is provided on the inner side of the assembly portion 23. The protrusion 24 is roughly semi-cylindrical, and a fixing surface 25 perpendicular to the installation direction of the base 2 is formed at the end of the protrusion 24, and a first threaded hole 26 is provided on the fixing surface 25. The cross section of the protrusion 24 forms a mounting surface 27 parallel to the installation direction of the base 2, and a second threaded hole 28 is provided on the mounting surface 27. The anti-rotation key 22 is provided on the protrusion 24. A mounting portion 29 is provided on the outer side of the assembly portion 23, and the mounting portion 29 is provided with a sensor mounting thread for threading the sensor to the measured object. The mounting portion 29 is hollow and sealed by the front cover 1 to form a temperature sensitive element mounting space. The temperature sensitive element 19 is arranged in the temperature sensitive element mounting space and connected to the circuit board 13 through a wire. The base assembly portion 23 is also provided with an oblique hole 30 connecting the temperature sensitive element mounting space and the receiving cavity. The wire passes from the temperature sensitive element mounting space through the oblique hole 30 to the receiving cavity.

[0042] The circuit board 13 is located in the receiving cavity, and the circuit board 13 is provided with a soldering pad which is welded to the cable 8. The circuit board 13 is fixed to the fixing surface 25 on the inner side of the base 2 by the mounting screws 12 cooperating with the first threaded holes 26.

[0043] The piezoelectric component includes a locking screw 14, a mass block 18, a first insulating ceramic (unnumbered), a first lead-in plate 16 (a thin plate located between the first insulating ceramic and the piezoelectric ceramic), a piezoelectric ceramic 17, a second lead-in plate (a thin plate located between the piezoelectric ceramic and the second insulating ceramic), and a second insulating ceramic 15. Through holes are provided in the middle of the mass block 18, the first insulating ceramic, the first lead-in plate 16, the piezoelectric ceramic 17, the second lead-in plate, and the second insulating ceramic 15, which are sequentially mounted on the locking screw 14. An insulating sleeve (unnumbered) is mounted on the locking screw 14, which is screwed into the second threaded hole 28 after mounting. The first lead-in plate 16 and the second lead-in plate are connected to the circuit board 13 through wires.

[0044] In this embodiment, the bellows 9 is a metal hose (preferably a stainless steel hose). The metal hose is a metal thin strip made of metal material, which is wound according to a certain inner and outer diameter and pitch, and is coated with plastic on the outer periphery. It is often used as a cable protection sleeve. Of course, in other embodiments, the bellows can also be made of plastic, but the metal hose has a higher hardness and is more suitable for direct connection with the sensor.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bellows locking structure for a sensor, used to fix a bellows, wherein the bellows is located at the tail end of the sensor and is wrapped around the outer circumference of the cable to protect the cable, characterized in that: The bellows locking structure of the sensor includes a gland seat, a gland, a sleeve and a cap; the gland seat is fixed on the sensor and is provided with a groove at the end away from the sensor; one end of the gland is inserted into the groove and is threadedly connected to the gland seat, and a protrusion is provided on the outer periphery of the gland, which fits the inner groove of the bellows so that the bellows can be screwed onto the gland; the cap is fixed to the outer side of the gland seat; the sleeve is elastic and is located between the cap and the bellows, so that when the cap is installed, it squeezes the sleeve, the sleeve is deformed, fills the gap between the gland seat and the bellows, and squeezes the bellows inward to hold the bellows tightly.

2. The bellows locking structure of the sensor according to claim 1, characterized in that: The cap is threadedly connected to the outer side of the gland seat and the sleeve is squeezed by tightening during installation.

3. The bellows locking structure of the sensor according to claim 1, characterized in that: The protrusion of the gland is a spiral protrusion corresponding to the inner diameter and pitch of the bellows.

4. The bellows locking structure of the sensor according to claim 1, characterized in that: It also includes a sealing rubber plug, which is located in the groove of the gland seat.

5. The bellows locking structure of the sensor according to claim 4, characterized in that: A plastic gasket is also provided between the sealing rubber plug and the gland, so that during the tightening process of the gland, the gland and the plastic gasket can rotate relative to each other, but the plastic gasket will not drive the sealing rubber plug to rotate due to the rotation.

6. The bellows locking structure of the sensor according to claim 1, characterized in that: The corrugated pipe is a metal hose.

7. A sensor, characterized in that: A bellows locking structure for a sensor comprising any one of claims 1 to 6, wherein the sensor comprises a base and a shell, wherein the base and the shell form a receiving cavity, and the gland seat is fixed to the shell.

8. The sensor according to claim 7, characterized in that A stop key is provided on the outer periphery of the base, and a stop groove is correspondingly provided on the inner periphery of the shell. The stop key cooperates with the stop groove to prevent the base and the shell from rotating relative to each other due to excessive torque when the sensor is installed and tightened.

9. The sensor according to claim 7, characterized in that The sensor further comprises a circuit board, the circuit board is provided with a soldering pad connected with the cable by welding, and the circuit board is located in the receiving cavity.

10. The sensor according to claim 9, characterized in that The direction in which the base is installed on the shell is opposite to the direction in which the cable is installed on the shell. A fixing surface perpendicular to the base installation direction is provided on the inner side of the base, and the circuit board is fixed on the fixing surface.

11. The sensor according to claim 10, characterized in that The fixing surface is provided with a first threaded hole, and the circuit board is fixed to the fixing surface by installing screws.

12. The sensor according to claim 9, characterized in that The base is provided with a second threaded hole, and a piezoelectric component is also provided in the accommodating cavity. The piezoelectric component includes a locking screw, a mass block, a first insulating ceramic, a first lead-in plate, a piezoelectric ceramic, a second lead-in plate, and a second insulating ceramic. A through hole is provided in the middle of the mass block, the first insulating ceramic, the first lead-in plate, the piezoelectric ceramic, the second lead-in plate, and the second insulating ceramic, and they are sequentially mounted on the locking screw. An insulating sleeve is mounted on the locking screw, which is screwed into the second threaded hole after being mounted. The first lead-in plate and the second lead-in plate are connected to the circuit board through wires.

13. The sensor according to claim 12, characterized in that The direction in which the base is installed on the housing is opposite to the direction in which the cable is installed on the housing. A mounting surface parallel to the mounting direction of the base is provided on the inner side of the base, and the second threaded hole is provided on the mounting surface.

14. The sensor according to claim 9, characterized in that A mounting portion is provided on the outside of the base, the mounting portion is provided with a sensor mounting thread, and the mounting portion is hollow to form a temperature sensitive element mounting space. The temperature sensitive element is arranged in the temperature sensitive element mounting space and connected to the circuit board through a wire.

15. The sensor according to claim 14, characterized in that The base is provided with an oblique hole connecting the temperature sensitive element installation space and the receiving cavity, and the wire passes through the oblique hole from the temperature sensitive element installation space to the receiving cavity.

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