Angle sensor for low temperature and low pressure

Abstract

The utility model relates to an angle sensor for low temperature and low pressure, which comprises a shell, a rotating shaft, a magnet, a circuit board assembly and a supporting piece, the supporting piece is arranged in the shell, the rotating shaft is fixed on the supporting piece through a bearing, the magnet is fixed at one end of the rotating shaft, and the circuit board assembly comprises a magnetic induction chip. The magnetic induction chip is used for sensing magnetic field changes generated in the rotating process of the magnet, the preset position of the rotating shaft is sleeved with a rotating sealing piece, the inner wall of the rotating sealing piece is in interference fit with the rotating shaft, the outer wall of the rotating sealing piece is in interference fit with the inner wall of the supporting piece, an end face sealing piece is arranged at the end of the supporting piece, and the rotating shaft penetrates through the end face sealing piece and extends out of the shell. The end face sealing piece is used for sealing the end face connecting part of the rotating shaft and the supporting piece. The utility model has the advantages of simple structure, extremely high IP protection level, strong anti-interference capability and extremely good low-temperature and low-pressure waterproof effect, and is particularly suitable for low-temperature and low-pressure cold storage application scenarios.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sensor technical field, concretely relates to a low temperature low pressure angle sensor. BACKGROUND

[0002] Angle sensor is usually used in automatic control system, servo system, angle speed information feedback system in industrial automation, precision instrument and meter, electric actuator, numerical control machine tool, weapon equipment and aerospace etc. field. Due to the progress of modern control technology, the angle sensor with reliable stability, higher precision and better performance is usually needed in the above system. But most angle sensors are damaged by condensate water and are not suitable for working in cold storage or high altitude low temperature environment.

[0003] Therefore, it is urgent to provide an angle sensor with simplified structure, good sealing and waterproof performance and suitable for low temperature and low pressure. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of angle sensors with simplified structure, good sealing and waterproof performance and suitable for low temperature and low pressure.

[0005] The above-mentioned purpose is realized by the following technical scheme: a low temperature low pressure angle sensor, including shell, pivot, magnet, circuit board assembly and support, the support is arranged in the shell, the pivot is fixed on the support by bearing, the magnet is fixed at one end of the pivot, the circuit board assembly includes magnetic induction chip, the magnetic induction chip is used to sense the magnetic field change generated in the magnet rotation process, predetermined position of the pivot is equipped with rotary seal, the inner wall of the rotary seal is interference fit with the pivot, the outer wall of the rotary seal is interference fit with the inner wall of the support, the end of the support is equipped with end face seal, the pivot passes through the end face seal and extends out of the shell, the end face seal is used for the sealing of pivot and support end face connecting portion.

[0006] The utility model is used to solve the technical problem of condensate water seepage in the equipment, instrument and control system working in low temperature and low pressure environment, and widens the application scene of multiple products without affecting the output performance of angle sensor. The utility model adopts double sealing structure, adopts end face sealing element to seal and prevent water in the end face connecting part of rotating shaft and support, adopts rotary sealing element to seal and prevent water in the middle part of rotating shaft support, rotating shaft and rotary sealing element are interference fit, the interference sealing amount is about 25%, support and rotary sealing element outer wall are interference fit, and the upper end face of support and rotary sealing element is flattened. The utility model ensures that no condensate water seeps in when the product works in low pressure and low temperature environment, in the specific application process, bearing is installed in the bearing chamber of support and is used to support and fix rotating shaft, rotating shaft and bearing inner ring are fixed by anaerobic glue bonding and interference fit, bearing outer ring and shell are fixed by anaerobic glue bonding, and transition sleeve is arranged between bearings.

[0007] Further technical solutions are that the inner wall of the rotary sealing element is provided with a plurality of protrusions. In this way, the inner wall of the rotary sealing element is tightly attached to the rotating shaft, ensuring the sealing effect.

[0008] Further technical solutions are that the rotary sealing element is provided with a variable slot. In this way, the rotary sealing element has a certain variable space, is easy to assemble, and ensures that the upper end face of the support and the rotary sealing element is flattened after assembly.

[0009] Further technical solutions are that the rotating shaft forms a stepped surface at the position of extending out of the support, the outer wall and the inner wall of the end face sealing element downwardly form a first protruding part and a second protruding part, the inner wall of the second protruding part is interference fit with the rotating shaft, the bottom wall of the second protruding part is attached to the stepped surface, and the bottom wall of the first protruding part is clearance fit with the end face of the support.

[0010] In the specific application process, the inner wall of the second protruding part of the rotating shaft and the end face sealing element is interference fit and fixed by epoxy glue, the compression amount of the interference fit between the inner wall of the second protruding part of the rotating shaft and the end face sealing element is about 25%, the end face sealing element rotates together with the rotating shaft during the rotation of the rotating shaft, the bottom wall of the second protruding part of the end face sealing element is a stop surface matched with the stepped surface of the rotating shaft, the rotating shaft is interference fit with the bearing inner ring, and the rotating shaft is clearance fit with the magnet and fixed by epoxy glue. The stepped surface exists because the diameter of the rotating shaft inside the support is larger than the diameter of the part extending out.

[0011] Further technical solutions are that a third protruding part is arranged between the first protruding part and the second protruding part, and the bottom wall of the third protruding part is attached to the end face of the support to form a sealing part. In this way, the bottom wall of the third protruding part is attached to the end face of the support to strengthen the waterproof effect.

[0012] Further, the outer wall of the support member is provided with an annular groove, an annular sealing ring is arranged in the annular groove, the shell is arranged on the support member, and the inner wall of the shell is in interference fit with the annular sealing ring. In this way, the connecting part of the radial support member and the shell is sealed by the annular sealing ring, and the waterproof effect is further improved. The annular sealing ring is arranged in the annular groove and elastically matched with the support member, the shell is in interference fit with the annular sealing ring, and the interference amount is about 20%. Preferably, 2-3 annular sealing rings are arranged.

[0013] Further, the rotating shaft is made of a non-magnetic material.

[0014] Further, the circuit board assembly further comprises a printed board, and the printed board is in communication connection with the magnetic induction chip. In the application process, the circuit board assembly is arranged in the shell and fixed by screws. The magnetic induction chip is arranged on the same axis with the magnet, and the rotating shaft drives the magnet to rotate, so that a periodically changing magnetic field is generated. The magnetic induction chip senses the change of the magnetic field and transmits a signal to the printed board. The printed board can obtain a certain angle value through a certain algorithm and output to a required device for control.

[0015] Further, the support member and the shell are fixedly connected through locking screws.

[0016] Further, the rotating shaft is provided with a snap ring for limiting the bearing.

[0017] Compared with the prior art, the angle sensor has the advantages of simple structure, high IP protection level, strong anti-interference capability, double sealing structure in the axial and radial directions, excellent low-temperature and low-pressure waterproof effect, and is particularly suitable for cold storage application scenarios with low temperature and low pressure. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein for explanation by reference.

[0019] Figure 1 A cross-sectional view of the angle sensor for low temperature and low pressure according to an embodiment of the application;

[0020] Figure 2 An exploded view of the angle sensor for low temperature and low pressure according to an embodiment of the application;

[0021] Figure 3 A cross-sectional view of the end face sealing member according to an embodiment of the application;

[0022] Figure 4A cross-sectional view of the rotating sealing element according to an embodiment of the utility model;

[0023] Figure 5 A cross-sectional view of the rotating sealing element according to an embodiment of the utility model;

[0024] In the drawing,

[0025] 1 end face sealing element 2 support element 3 rotating sealing element 4 transition sleeve

[0026] 5 bearing 6 housing 7 locking screw 8 snap ring

[0027] 9 annular sealing ring 10 magnet 11 rotating shaft 12 circuit board assembly

[0028] 101 first protruding portion 102 second protruding portion 103 third protruding portion 301 protrusion

[0029] 302 variable groove 1101 stepped surface DETAILED DESCRIPTION

[0030] The utility model will be described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model. In addition, the person skilled in the art can combine the features in the embodiments in this document and the features in different embodiments according to the description in this document.

[0031] The utility model implementation is as follows, referring to Figure 1 and Figure 2 An angle sensor for low temperature and low pressure, comprising a housing 6, a rotating shaft 11, a magnet 10, a circuit board assembly 12 and a support element 2, the support element 2 is arranged in the housing 6, the rotating shaft 11 is fixed on the support element 2 through a bearing 5, the magnet 10 is fixed on one end of the rotating shaft 11, the circuit board assembly 12 comprises a magnetic induction chip, the magnetic induction chip is used for sensing the magnetic field change generated in the rotating process of the magnet 10, a rotating sealing element 3 is sleeved on the predetermined position of the rotating shaft 11, the inner wall of the rotating sealing element 3 is in interference fit with the rotating shaft 11, the outer wall of the rotating sealing element 3 is in interference fit with the inner wall of the support element 2, the end of the support element 2 is provided with an end face sealing element 1, the rotating shaft 11 passes through the end face sealing element 1 and extends out of the housing 6, and the end face sealing element 1 is used for sealing the end face connecting portion of the rotating shaft 11 and the support element 2.

[0032] The utility model is used to solve the technical problem of condensate water seepage in the equipment, instrument and control system working in low temperature and low pressure environment, and widens the application scene of multiple products on the basis of not influencing the output performance of angle sensor. The utility model adopts double sealing structure, adopts end face sealing piece 1 to seal waterproof in the end face connecting part of rotating shaft 11 and support piece 2, adopts rotary sealing piece 3 to seal water in the middle part of rotating shaft 11 support piece 2, rotating shaft 11 and rotary sealing piece 3 are interference fit, and the interference sealing amount is about 25%, support piece 2 and the outer wall of rotary sealing piece 3 are interference fit, and the upper end face of support piece 2 and rotary sealing piece 3 is flattened. The utility model ensures that no condensate water seeps in when the product works in low pressure and low temperature environment, in the specific application process, bearing 5 is installed in the bearing 5 chamber of support piece 2 and is used to support and fix rotating shaft 11, rotating shaft 11 and the inner ring of bearing 5 adopt anaerobic glue bonding and interference fit fixing, the outer ring of bearing 5 and shell 6 adopt anaerobic glue bonding and fixing, and transition sleeve 4 is arranged between bearing 5.

[0033] On the basis of the above embodiment, in another embodiment of the utility model, Figure 1 and Figure 4 The inner wall of rotary sealing piece 3 is provided with a plurality of protrusions 301. In this way, the inner wall of rotary sealing piece 3 is ensured to be fully tightly combined with rotating shaft 11, and the sealing effect is ensured.

[0034] On the basis of the above embodiment, in another embodiment of the utility model, Figure 1 and Figure 4 Rotary sealing piece 3 is provided with a variable slot 302. In this way, rotary sealing piece 3 is ensured to have a certain variable space, easy assembly, and the upper end face of support piece 2 and rotary sealing piece 3 is ensured to be flattened after assembly.

[0035] On the basis of the above embodiment, in another embodiment of the utility model, Figure 1 、 Figure 3 and Figure 5 Rotating shaft 11 forms a stepped surface 1101 at the position of extending support piece 2, the outer wall and the inner wall of end face sealing piece 1 downwardly form a first protruding part 101 and a second protruding part 102, the inner wall of the second protruding part 102 is interference fit with rotating shaft 11, the bottom wall of the second protruding part 102 is combined with the stepped surface 1101, and the bottom wall of the first protruding part 101 is clearance fit with the end face of support piece 2.

[0036] In the specific application process, the rotating shaft 11 is in interference fit with the inner wall of the second protruding part 102 of the end face seal 1, and is fixed by epoxy glue, the compression amount of the interference fit between the rotating shaft 11 and the inner wall of the second protruding part 102 of the end face seal 1 is about 25%, in the rotating process of the rotating shaft 11, the end face seal 1 rotates together with the rotating shaft 1; the bottom wall of the second protruding part 102 of the end face seal 1 is a cooperation stop surface with the stepped surface 1101 of the rotating shaft 11; the rotating shaft 11 is in interference fit with the inner ring of the bearing 5, and the rotating shaft 11 is in clearance fit with the magnet 10 and is fixed by epoxy glue. The stepped surface 1101 exists because the diameter of the rotating shaft 11 inside the support 2 is larger than the diameter of the protruding part.

[0037] On the basis of the above-mentioned embodiment, in another embodiment of the utility model, Figure 3 The third protruding part 103 is provided between the first protruding part 101 and the second protruding part 102, and the bottom wall of the third protruding part 103 is attached to the end face of the support 2 to form a sealing part. In this way, the bottom wall of the third protruding part 103 is attached to the end face of the support 2, thereby enhancing the waterproof effect.

[0038] On the basis of the above-mentioned embodiment, in another embodiment of the utility model, Figure 1 And Figure 2 The outer wall of the support 2 is provided with an annular groove, the annular groove is provided with an annular sealing ring 9, the shell 6 is sleeved on the support 2, and the inner wall of the shell 6 is in interference fit with the annular sealing ring 9. In this way, the connection part of the radial support 2 and the shell 6 is sealed by the annular sealing ring 9, thereby further enhancing the waterproof effect. The annular sealing ring 9 is elastically matched with the support 2 in the annular groove, the shell 6 is in interference fit with the annular sealing ring 9, and the interference amount is about 20%. Preferably, 2-3 annular sealing rings 9 are provided.

[0039] On the basis of the above-mentioned embodiment, in another embodiment of the utility model, the rotating shaft 11 is made of non-magnetic material.

[0040] On the basis of the above-mentioned embodiment, in another embodiment of the utility model, the circuit board assembly 12 further comprises a printed board, and the printed board is in communication connection with the magnetic induction chip. In the application process, the circuit board assembly 12 is installed on the shell 6 and is fixed by screws. The magnetic induction chip is placed on one side of the magnet 10 and is coaxial with the magnet 10, the rotating shaft 11 drives the magnet 10 to rotate, thereby generating a periodically changing magnetic field, the magnetic induction chip senses the change of the magnetic field and transmits the signal to the printed board, and the printed board can obtain a certain angle value through a certain algorithm and outputs the angle value to a required device for control.

[0041] On the basis of the above-mentioned embodiment, in another embodiment of the utility model, Figure 1 And Figure 2The support 2 is fixedly connected with the shell 6 through a locking screw 7.

[0042] On the basis of the above-mentioned embodiments, in another embodiment of the utility model, as Figure 1 and Figure 2 The shaft 11 is provided with a snap ring 8 for limiting the bearing 5.

[0043] Compared with the prior art, the utility model has the advantages of simple structure, extremely high IP protection level, strong anti-interference ability, double sealing structure in axial and radial directions, extremely good low-temperature and low-pressure waterproof effect, and special application to low-temperature and low-pressure refrigeration house application scenarios.

[0044] The above-mentioned is only preferred implementation manner of the utility model, it should be pointed out, for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, can also make a number of improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the utility model.

Claims

1. An angle sensor for cryogenic low pressure, characterized by, The application relates to a rotating magnetic induction device, which comprises a shell, a rotating shaft, a magnet, a circuit board assembly and a support, the support is arranged in the shell, the rotating shaft is fixed on the support through a bearing, the magnet is fixed on one end of the rotating shaft, the circuit board assembly comprises a magnetic induction chip, the magnetic induction chip is used for inducting the magnetic field change generated in the rotating process of the magnet, a rotary sealing element is arranged on a predetermined position of the rotating shaft, the inner wall of the rotary sealing element is in interference fit with the rotating shaft, the outer wall of the rotary sealing element is in interference fit with the inner wall of the support, an end face sealing element is arranged at the end of the support, the rotating shaft penetrates through the end face sealing element and extends out of the shell, and the end face sealing element is used for sealing the end face connecting part of the rotating shaft and the support.

2. The angle sensor for cryogenic low pressure according to claim 1, characterized by, The inner wall of the rotary sealing element is provided with a plurality of protrusions.

3. The angle sensor for cryogenic low pressure use according to claim 2, characterized in that, The rotary sealing element is provided with a variable volume groove.

4. The angle sensor for low temperature and low pressure according to any one of claims 1 to 3, characterized by The rotating shaft is formed with a stepped surface at the position of extending out of the support, the outer wall and the inner wall of the end face sealing element are downwardly formed with a first protruding part and a second protruding part, the inner wall of the second protruding part is in interference fit with the rotating shaft, the bottom wall of the second protruding part is attached to the stepped surface, and the bottom wall of the first protruding part is in clearance fit with the end face of the support.

5. The angle sensor for cryogenic low pressure use according to claim 4, characterized in that, A third protruding part is arranged between the first protruding part and the second protruding part, the bottom wall of the third protruding part is attached to the end face of the support to form a sealing part.

6. The angle sensor for cryogenic low pressure use according to claim 1, characterized by, The outer wall of the support is provided with an annular groove, an annular sealing ring is arranged in the annular groove, the shell is arranged on the support, and the inner wall of the shell is in interference fit with the annular sealing ring.

7. The angle sensor for cryogenic low pressure use according to claim 6, characterized in that, The rotating shaft is made of non-magnetic material.

8. The angle sensor for cryogenic low pressure use according to claim 6, characterized by The circuit board assembly further comprises a printed board, and the printed board is in communication connection with the magnetic induction chip.

9. The angle sensor for cryogenic low pressure use according to claim 1, characterized by, The support and the shell are fixedly connected through locking screws.

10. The angle sensor for cryogenic low pressure use according to claim 1, characterized by, The rotating shaft is provided with a snap ring for limiting the bearing.

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