Pressure and temperature integrated sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a pressure and temperature integrated sensor, which comprises a pressure detection unit and a temperature detection unit, the pressure detection unit comprises an elastic base body, a strain gauge and a circuit board, a central channel and an annular channel are formed in the elastic base body, and the closed end of the annular channel extends along the radial direction to form a sensing surface; the temperature detection unit comprises a sleeve fixed with the channel wall of the central channel, a sleeve cavity is communicated with the central channel to form a temperature detection channel, and a temperature detection element is arranged in the temperature detection channel; according to the utility model, the sleeve sleeved outside the temperature detection element is used for protecting the temperature detection element, and the temperature detection element is arranged in the center of the elastic base body, and the periphery of the temperature detection element is completely wrapped by fluid during temperature measurement, so that the sensitivity and the accuracy of temperature detection are improved; and the area of the sensing surface formed by radially extending from the closed end of the elastic base body is larger, so that the pasting requirement of the strain gauge can be met, and the pressure detection precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field especially relates to a pressure temperature integrated sensor. BACKGROUND

[0002] Pressure detection sometimes needs to be accompanied by temperature detection, so pressure detection and temperature detection are usually integrated on the same sensor.

[0003] In the prior art, in order to facilitate processing, the temperature detection element is directly placed in the pressure detection flow channel, which directly contacts with the fluid to realize temperature detection. However, some fluids are corrosive, which can damage the temperature detection element, directly leading to temperature detection failure and reducing the service life of the sensor. SUMMARY

[0004] The technical problem to be solved by the utility model is that the temperature detection element is directly placed in the pressure detection flow channel in the pressure temperature sensor of the prior art, which directly contacts with the fluid to realize temperature detection. However, some fluids are corrosive, which can damage the temperature detection element, directly leading to temperature detection failure and reducing the service life of the sensor. The utility model provides a pressure temperature integrated sensor.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a pressure temperature integrated sensor, comprising:

[0006] A pressure detection unit, comprising an elastic base, a strain gauge and a circuit board electrically connected to the strain gauge, the elastic base has a central channel extending along its axial direction and an annular channel surrounding the central channel on the outside, one end of the annular channel is an open end, and the other end is a closed end, the closed end extends radially to form a sensing surface for the strain gauge;

[0007] And a temperature detection unit, comprising a sleeve fixed to the channel wall of the central channel, one end of the sleeve away from the central channel is blocked, and the sleeve lumen and the central channel are communicated to form a temperature detection channel, the temperature detection channel is provided with a temperature detection element, and the temperature detection element is electrically connected to the circuit board.

[0008] Further, a threaded pipe is fixed to the open end of the elastic base, the inner peripheral wall of the threaded pipe and the outer peripheral wall of the sleeve form an annular cavity, and the annular cavity and the annular channel are communicated to form a pressure detection channel.

[0009] Further, the outer peripheral wall of the threaded pipe close to one end of the elastic base forms a first mounting step, and the elastic base abuts against and is welded to the first mounting step;

[0010] The channel wall of the central channel is formed with a second mounting step near one end of the sleeve, and the sleeve is in abutment with the second mounting step and is welded and fixed.

[0011] Further, the sleeve comprises a large-diameter section close to the central channel and a small-diameter section away from the central channel, and the temperature detection element is located in the small-diameter section.

[0012] Further, the outer peripheral wall of the threaded pipe is formed with an extension body protruding in the radial direction, and a flange is fixed on the extension body, and the circuit board is arranged on the flange.

[0013] Further, it further comprises:

[0014] a housing fixed with the flange and internally formed with a mounting cavity;

[0015] and a connecting piece located in the mounting cavity and in abutment with the circuit board at one end.

[0016] Further, the inner peripheral wall of the sleeve is coated with a heat-conducting glue between the temperature detection element.

[0017] Further, the axial extension length of the elastic matrix is less than the axial extension length of the threaded pipe.

[0018] The utility model discloses the sleeve of setting outside temperature detection element to provide protection to temperature detection element, and temperature detection element sets up in the center of elastic matrix, and it is completely wrapped around by fluid when measuring temperature, thereby improve the sensitivity and accuracy of temperature detection, and the inductive surface area formed by the closed end radial extension of elastic matrix is larger, can satisfy the strain gauge setting requirement, thereby improve pressure detection precision. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in connection with the drawings and examples.

[0020] Fig. 1 It is the whole schematic diagram of the utility model;

[0021] Fig. 2 It is the sectional view of the utility model;

[0022] Fig. 3 It is the assembly schematic diagram of elastic matrix and threaded pipe in the utility model;

[0023] In the drawing:

[0024] 1, elastic matrix; 101, central channel; 102, annular channel; 1021, inductive surface; 103, second mounting step;

[0025] 2, strain gauge;

[0026] 3, circuit board;

[0027] 4. Sleeve;

[0028] 5. Temperature sensing element;

[0029] 6. Threaded pipe; 601. First mounting step; 602. Extension body;

[0030] 7. Flange;

[0031] 8. Outer shell; 801. Upper shell; 8011. Slot; 802. Lower shell; 8021. Outer flange; 8022. Inner flange;

[0032] 9. Connectors. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0034] like Figs. 1-3 As shown, an integrated pressure and temperature sensor includes:

[0035] The pressure detection unit includes an elastic matrix 1, a strain gauge 2, and a circuit board 3 electrically connected to the strain gauge 2. A connecting wire is provided between the strain gauge 2 and the circuit board 3. The connecting wire can be, but is not limited to, aluminum wire, etc.

[0036] The elastic matrix 1 has a central channel 101 extending along its axial direction and an annular channel 102 surrounding the outside of the central channel 101. The central channel 101 is coaxially arranged with the elastic matrix 1.

[0037] The annular channel 102 has an open end at one end and a closed end at the other end. The closed end extends radially to form a sensing surface 1021 for attaching the strain gauge 2. The increased area of ​​the sensing surface 1021 increases the area available for attaching the strain gauge 2, making it easier to locate the attachment position. The accuracy of the attachment position is positively correlated with the detection accuracy. Fluid enters the annular channel 102 from the open end, and the sensing surface 1021 deforms under the pressure of the fluid, causing a change in the resistance of the strain gauge 2. The signal is then conditioned by the circuit board 3 to achieve high-precision pressure monitoring.

[0038] and a temperature detecting unit, comprising a sleeve 4 fixed with the channel wall of the center channel 101, the sleeve 4 is made of heat conductive material, one end of the sleeve 4 is blocked and the sleeve 4 lumen is communicated with the center channel 101 to form a temperature detecting channel, the temperature detecting channel is provided with a temperature detecting element 5, the temperature detecting element 5 is electrically connected with the circuit board 3 through a connecting line, the center channel 101 is located at the center part of the elastic matrix 1, and the part is usually not used to attach the strain gauge 2, so that the sensor can add temperature detection without sacrificing the surface strain area, and the detection accuracy is ensured with high integration.

[0039] The sleeve 4 sleeved outside the temperature detecting element 5 is used for protecting the temperature detecting element 5, the temperature detecting element 5 is arranged at the center of the elastic matrix 1, the periphery of the temperature detecting element 5 is completely wrapped by the fluid during temperature measurement, so that the sensitivity and accuracy of temperature detection are improved, the sensing surface 1021 formed by extending radially from the closed end of the elastic matrix 1 has a larger area, the requirement of attaching the strain gauge 2 is met, and the pressure detection precision is improved.

[0040] In some examples, a threaded pipe 6 fixed with the opening end of the elastic matrix 1 is further included, the threaded pipe 6 is formed with external threads connected with an external pipeline, the inner peripheral wall of the threaded pipe 6 and the outer peripheral wall of the sleeve 4 form an annular cavity, the annular cavity is communicated with the annular channel 102 to form a pressure detecting channel, the opening end of the pressure detecting channel is in the shape of a flared mouth, and the sleeve 4 does not extend out of the threaded pipe 6.

[0041] In some examples, the first mounting step 601 is formed on the outer peripheral wall of the threaded pipe 6 close to one end of the elastic matrix 1, the elastic matrix 1 abuts against and is welded with the first mounting step 601, so as to ensure the sealing between the threaded pipe 6 and the elastic matrix 1.

[0042] The second mounting step 103 is formed on the channel wall of the center channel 101 close to one end of the sleeve 4, the sleeve 4 abuts against and is welded with the second mounting step 103, so as to ensure the sealing between the elastic matrix 1 and the sleeve 4, the first mounting step 601 and the second mounting step 103 are both spaced apart from the sensing surface 1021 by a certain distance, so that the welding stress does not affect the surface strain.

[0043] In some examples, the sleeve 4 includes a large-diameter section close to the center channel 101 and a small-diameter section away from the center channel 101, the temperature detecting element 5 is located in the small-diameter section and is as close as possible to the inner wall of the small-diameter section to reduce the loss in the heat transfer process, so as to improve the detection accuracy, and the large-diameter section can facilitate the temperature detecting element 5 to enter the small-diameter section.

[0044] In some examples, the outer circumferential wall of the threaded pipe 6 is formed with an extension body 602 radially protruding, a flange 7 is fixed on the extension body 602, the circuit board 3 is arranged on the flange 7, the flange 7 supports the circuit board 3, and the circuit board 3 is fixedly glued to the flange 7, the circuit board 3 is spaced apart from the elastic base 1 and does not directly contact the elastic base 1, so that the influence of fluid impact force on the circuit board 3 and the connecting wire is eliminated.

[0045] In some examples, the utility model also comprises:

[0046] The shell 8 is fixed to the flange 7 and internally formed with a mounting cavity, the shell 8 is formed with an outward turning edge 8021 fixedly welded to the flange 7, and the shell 8 comprises an upper shell 801 and a lower shell 802 arranged in clamping mode, and the specific structure can be that the lower shell 802 is formed with an inward turning edge 8022 at one end close to the upper shell 801, and the upper shell 801 is formed with a clamping groove 8011 for clamping the inward turning edge 8022.

[0047] The connecting piece 9 is located in the mounting cavity and abuts against the circuit board 3 at one end, the connecting piece 9 is a spring, and the upper shell 801 is formed with a limiting step for limiting the connecting piece 9.

[0048] In some examples, the inner circumferential wall of the sleeve 4 and the temperature detection element 5 are coated with heat-conducting glue, so that the sensitivity of temperature detection can be improved.

[0049] In some examples, the axial extension length of the elastic base 1 is less than the axial extension length of the threaded pipe 6, and the wall thickness of the threaded pipe 6 is greater than the wall thickness of the elastic base 1, so that the threaded pipe 6 with a large length has a greater thickness, and the structural strength of the whole sensor can be improved.

[0050] Based on the above ideal embodiments of the utility model, the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the claims.

Claims

1. A pressure-temperature integrated sensor, characterized by: The utility model relates to a pressure and temperature detection device, comprising: a pressure detection unit, including an elastic base (1), a strain gauge (2) and a circuit board (3) electrically connected with the strain gauge (2), the elastic base (1) is internally formed with a central passage (101) extending along its axial direction and an annular passage (102) surrounding the outside of the central passage (101), one end of the annular passage (102) is an open end, and the other end is a closed end, and the closed end is formed with a sensing surface (1021) for attaching the strain gauge (2) along the radial direction; and a temperature detection unit, including a sleeve (4) fixed with the passage wall of the central passage (101), the end of the sleeve (4) away from the central passage (101) is blocked, and the lumen of the sleeve (4) is communicated with the central passage (101) to form a temperature detection passage, the temperature detection passage is provided with a temperature detection element (5), and the temperature detection element (5) is electrically connected with the circuit board (3).

2. The integrated pressure and temperature sensor of claim 1, wherein: Further comprising a threaded pipe (6) fixed with the open end of the elastic base (1), the inner peripheral wall of the threaded pipe (6) and the outer peripheral wall of the sleeve (4) form an annular cavity, the annular cavity is communicated with the annular passage (102) to form a pressure detection passage.

3. The integrated pressure and temperature sensor of claim 2, wherein: The outer peripheral wall of the threaded pipe (6) near one end of the elastic base (1) is formed with a first mounting step (601), the elastic base (1) abuts against and is welded with the first mounting step (601); the passage wall of the central passage (101) near one end of the sleeve (4) is formed with a second mounting step (103), and the sleeve (4) abuts against and is welded with the second mounting step (103).

4. The integrated pressure and temperature sensor of claim 1, wherein: The sleeve (4) comprises a large-diameter section near the central passage (101) and a small-diameter section away from the central passage (101), and the temperature detection element (5) is located in the small-diameter section.

5. The integrated pressure and temperature sensor of claim 2, wherein: The outer peripheral wall of the threaded pipe (6) is radially protruded to form an extension body (602), the flange (7) is fixed on the extension body (602), and the circuit board (3) is arranged on the flange (7).

6. The integrated pressure and temperature sensor of claim 5, wherein: Further comprising: a housing (8) fixed with the flange (7) and internally formed with a mounting cavity; and a connecting piece (9) located in the mounting cavity and abutting against one end of the circuit board (3).

7. The integrated pressure and temperature sensor of claim 1, wherein: Thermal conductive glue is coated between the inner peripheral wall of the sleeve (4) and the temperature detection element (5).

8. The integrated pressure and temperature sensor of claim 2, wherein: The axial extension length of the elastic base (1) is less than the axial extension length of the threaded pipe (6).

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