CN116086535A - Temperature and pressure compound sensor - Google Patents

Abstract

The invention provides a temperature-pressure composite sensor, which includes a casing and a detection unit. The casing includes a sealing head, a main body and a protective tube arranged in sequence along a first direction. The installation cavity, the second installation cavity and the third installation cavity, wherein, the sealing head is connected in the first installation cavity, and the protective tube is connected in the third installation cavity; the detection unit is arranged in the In the first installation cavity and the second installation cavity, the detection unit includes a control module, a pressure detection part and a temperature detection part, and the pressure detection part and the temperature detection part are respectively electrically connected to the control module , and the detection end of the temperature detection element extends into the protection tube along the first direction. The temperature-pressure composite sensor provided by the present invention aims to solve the problems in the prior art that the temperature detection element cannot be in direct contact with the medium to be detected, resulting in prolonged detection time and errors in detection accuracy.

Description

Temperature and pressure composite sensor

technical field

The invention belongs to the technical field of sensors, and more specifically relates to a temperature-pressure composite sensor.

Background technique

Sensors are one of the important technologies of modern measurement and automation systems. Sensors are widely used in process control from production to modern technological life. When temperature and pressure need to be measured at the same time in some places, it is often necessary to use a temperature sensor and a pressure sensor together.

At present, in the existing sensor technology, the temperature sensor and the pressure sensor usually adopt a split structure, and the temperature sensor and the pressure sensor are used for measurement respectively. The extension part measures the temperature to collect temperature data, and then measures the pressure through the separately provided pressure sensor and another conductive extension connected to the pressure sensor in the flexible circuit board to realize the pressure data collection. The temperature sensor generally includes a detection element and a metal casing packaged outside the detection element, and the detection element is fixed in the metal casing after being filled with glue. During detection, the metal shell is in direct contact with the medium to be measured, and the detection element completes the detection of the medium to be measured by sensing the temperature of the metal shell. Since the detection element cannot directly contact the medium to be measured, it takes a certain amount of time for temperature conduction, which not only prolongs the detection time, but also causes a certain error between the detection result and the actual situation due to the heat conduction loss of the metal shell, which affects the detection accuracy.

Contents of the invention

The purpose of the present invention is to provide a temperature-pressure composite sensor, aiming to solve the problems in the prior art that the temperature detection element cannot be in direct contact with the medium to be detected, resulting in prolonged detection time and errors in detection accuracy.

In order to achieve the above object, the technical solution adopted by the present invention is to provide a temperature-pressure composite sensor, comprising:

The casing includes a plugging head, a main body and a protective tube arranged in sequence along the first direction, and the main body is provided with a first installation cavity, a second installation cavity and a third installation cavity communicating with each other along the first direction, wherein the The plugging head is connected to the first installation cavity, and the protective tube is connected to the third installation cavity; and

The detection unit is arranged in the first installation cavity and the second installation cavity, and the detection unit includes a control module, a pressure detection part and a temperature detection part, and the pressure detection part and the temperature detection part are respectively connected with the The control modules are electrically connected, and the detection end of the temperature detection element extends into the protection tube along the first direction.

In a possible implementation manner, the first installation cavity, the second installation cavity and the third installation cavity are all cylindrical cavities, and the first installation cavity, the second installation cavity The inner diameters of the cavity and the third installation cavity gradually decrease.

In a possible implementation manner, the sealing head includes a fixing part and a connecting part arranged along the first direction, the connecting part is inserted into the first installation cavity, and an opening is opened in the connecting part. There is an accommodating cavity, and the accommodating cavity communicates with the first installation cavity in the first direction.

In a possible implementation manner, the fixing part is provided with a connection groove along the first direction, and the connection groove is used for plug-fitting with an external device.

In a possible implementation manner, the inner wall of the connecting groove is provided with a plurality of inserting strips arranged along the first direction, and the inserting strips are used for inserting with external devices.

In a possible implementation manner, the control module includes:

A flexible circuit part is arranged in the first installation cavity, and the flexible circuit part is used for electrical connection with external equipment;

a base, disposed in the second installation cavity, electrically connected to the flexible circuit, and the base isolates the second installation cavity from the first installation cavity;

The PCB circuit board is arranged on the base and is electrically connected to the pressure detection part, the temperature detection part and the flexible circuit part respectively, and the pressure detection part is welded to the PCB circuit board; and

The controller is arranged on the PCB circuit board.

In a possible implementation manner, the flexible circuit component includes:

a flexible circuit board, disposed in the first installation cavity, electrically connected to the PCB circuit board; and

One end of the conductive connecting piece is electrically connected to the flexible circuit board, and the other end extends out of the first installation cavity along the axial direction of the sealing head, and the conductive connecting piece is used for electrical connection with external equipment.

In a possible implementation manner, the base is in interference fit with the second installation cavity.

In a possible implementation manner, the base is a conical member, and a diameter of the base gradually decreases along the first direction.

In a possible implementation manner, the temperature detecting element includes a detecting element and a connecting element, and the detecting element is located in the protective tube for sensing temperature; the base is provided with a heat dissipation groove along the first direction , the PCB circuit board covers the opening of the heat sink, and the PCB circuit board is provided with a relief hole suitable for the connection element, and the connection element is inserted through the relief hole into the inside the heat sink.

The beneficial effect of the temperature-pressure composite sensor provided by the present invention is that compared with the prior art, the pressure detection part and the temperature detection part of the temperature-pressure composite sensor of the present invention respectively detect the pressure and temperature of the environment to be measured, and the detected new Feedback to the control module, and the control module processes the feedback information to obtain the detection result. The plugging head is set in the first installation cavity, thereby isolating the first installation cavity from the outside, preventing impurities such as water vapor and dust from entering the second and third installation cavities from the first installation cavity, ensuring that the detection unit is kept clean A dry environment increases the service life of the detection unit. The detection end of the temperature detection part extends into the protection tube, and the protection tube can prevent the temperature detection part from being damaged after being bumped by external force, and protect the temperature detection part. In addition, the protective tube is connected to the outside, and the medium to be measured can enter the protective tube and contact the temperature detection part, so that the temperature detection part can directly measure the temperature of the medium to be measured, which not only shortens the measurement time, but also avoids the medium to be measured from passing through the middle. The temperature loss during the assembly reduces the detection error.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is a schematic structural diagram of a temperature-pressure composite sensor provided by an embodiment of the present invention;

Fig. 2 is an explosion diagram of the temperature-pressure composite sensor provided by the embodiment of the present invention;

Fig. 3 is a top view of the temperature-pressure composite sensor provided by the embodiment of the present invention;

Fig. 4 is a cross-sectional view of A direction in Fig. 3;

Fig. 5 is a B-direction sectional view in Fig. 3;

FIG. 6 is a schematic structural diagram of a detection unit used in an embodiment of the present invention.

In the picture:

1. Plugging head; 101, connecting groove; 102, inserting strip; 103, fixing part; 104, connecting part;

2. Main body; 201, the first installation cavity; 202, the second installation cavity; 203, the third installation cavity;

3. Protective tube;

4. Temperature detection piece; 401, connection element; 402, detection element;

5. Pressure detection parts;

6. Detection unit; 601, base; 6011, heat sink; 602, PCB circuit board; 603, flexible circuit board; 604, conductive connecting piece; 605, metal pin.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, not for Describe a specific order. Unless otherwise stated, other orientation words, such as "vertical", "clockwise", "counterclockwise", etc. indicating orientation or positional relationship are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the specific protection scope of the present invention. In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, there is no displacement relationship and relative rotation relationship between the two. Any connection method, that is to say, includes non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements. In the claims, description and above-mentioned drawings of the present invention, if the terms "comprising", "having" and their variants are used, it is intended to mean "including but not limited to".

Please refer to FIG. 1 to FIG. 6 together, and now the temperature-pressure composite sensor provided by the present invention will be described. The temperature-pressure composite sensor includes a casing and a detection unit 6. The casing includes a plugging head 1, a main body 2 and a protective tube 3 arranged in sequence along the first direction. The main body 2 is provided with a first installation cavity 201 and a second The second installation cavity 202 and the third installation cavity 203, wherein the plugging head 1 is connected in the first installation cavity 201, and the protective tube 3 is connected in the third installation cavity 203; the detection unit 6 is arranged in the first installation cavity 201 and the third installation cavity 203. In the second installation cavity 202, the detection unit 6 includes a control module, a pressure detection part 5 and a temperature detection part 4, the pressure detection part 5 and the temperature detection part 4 are respectively electrically connected to the control module, and the detection end of the temperature detection part 4 is along the The first direction extends into the protection tube 3 .

The temperature-pressure composite sensor provided by the present invention, compared with the prior art, the pressure detection part 5 and the temperature detection part 4 of the temperature-pressure composite sensor of the present invention detect the pressure and temperature of the environment to be measured respectively, and feed back the detected new type to The control module, the control module processes the feedback information and obtains the detection result. The plugging head 1 is arranged in the first installation cavity 201, thereby isolating the first installation cavity 201 from the outside, preventing impurities such as water vapor and dust from entering the second installation cavity 202 and the third installation cavity 203 from the first installation cavity 201, This ensures that the detection unit 6 is in a clean and dry environment, and improves the service life of the detection unit 6 . The detection end of the temperature detection part 4 extends into the protection tube 3, and the protection tube 3 can prevent the temperature detection part 4 from being damaged after being bumped by an external force, and protect the temperature detection part 4. In addition, the protective tube 3 communicates with the outside, and the medium to be measured can enter the protective tube 3 and contact the temperature detection part 4, so that the temperature detection part 4 can directly measure the temperature of the medium to be measured, which not only shortens the measurement time, but also avoids the The temperature loss when the medium to be tested passes through the middleware reduces the detection error.

Optionally, the control module can be connected to an external display device to output the test results through the external display device, or a display screen can be set on the housing, the control module is electrically connected to the display screen, and the test results are output through the display screen.

In some embodiments, please refer to FIG. 4 to FIG. 5 , the first installation cavity 201 , the second installation cavity 202 and the third installation cavity 203 are all cylindrical cavities, and the first installation cavity 201 , the second installation cavity 202 and the inner diameter of the third installation cavity 203 gradually decrease.

The third installation chamber 203 communicates with the outside through the protective pipe 3, and the inner diameters of the first installation chamber 201, the second installation chamber 202, and the third installation chamber 203 are gradually reduced to reduce impurities such as water vapor and dust from entering through the protective pipe 3. The possibility in the third installation cavity 203 and the second installation cavity 202 ensures that the environment of the second installation cavity 202 and the third installation cavity 203 is clean. The first installation chamber 201 is isolated from the outside by the plugging head 1 , so the larger diameter of the first installation chamber 201 can increase the contact area with the plugging head 1 and improve the stability of the connection.

In some embodiments, please refer to FIG. 2 , the plugging head 1 includes a fixing portion 103 and a connecting portion 104 arranged along a first direction, the connecting portion 104 is inserted into the first installation cavity 201 , and there are openings in the connecting portion 104 The accommodation cavity communicates with the first installation cavity 201 in the first direction.

The connection part 104 is inserted into the first installation cavity 201 to realize the connection with the main body 2 . Opening the accommodation cavity on the plugging head 1 can not only reduce the weight of the plugging head 1, but also communicate with the first installation cavity 201, and the detection unit 6 can be arranged in the storage cavity to ensure the sealing effect and avoid the detection unit 6 is disturbed by the external environment.

In some embodiments, please refer to FIG. 4 to FIG. 5 , the fixing part 103 is provided with a connecting groove 101 along the first direction, and the control module has a connecting piece arranged in the connecting groove 101, and the connecting piece is used for electrical connection with external equipment. , the connection slot 101 is used for plugging and matching with external devices.

The connection groove 101 is mated with the external device, so that the connector located in the connection groove 101 is connected to the corresponding plug on the external device, and the electrical connection between the control module and the external device is realized, and the detection result of the detection module is passed through the external device. external output. The connection slot 101 is plugged with the external device, which can increase the stability of the connection between the control module and the external device, and the plugging method is more convenient for disassembly and assembly.

Optionally, the connecting piece is a metal component, and the external device is provided with a metal connecting piece corresponding to the connecting piece, so as to realize the conductive connection.

In some embodiments, please refer to FIG. 3 to FIG. 5 , the inner wall of the connection groove 101 is provided with a plurality of inserting strips 102 arranged along a first direction, and the inserting strips 102 are used for plugging with external devices.

The external device has a slot suitable for the plug, and the plug is plugged into the slot, which not only provides guidance for the connection groove 101 and the external device, but also prevents the sealing head 1 from moving in the circumferential direction after connection, thus affecting the connection between the connecting piece and the external device. electrical connection of the device.

In some embodiments, please refer to FIG. 4 to FIG. 6, the control module includes a flexible circuit, a base 601, a PCB circuit board 602 and a controller, the flexible circuit is arranged in the first installation cavity 201, and the flexible circuit is used for It is electrically connected with external equipment; the base 601 is arranged in the second installation cavity 202, and is electrically connected with the flexible circuit, and the base 601 isolates the second installation cavity 202 from the first installation cavity 201; The seat 601 is electrically connected with the pressure detection part 5 , the temperature detection part 4 and the flexible circuit part respectively, and the pressure detection part 5 is welded on the PCB circuit board 602 ; the controller is arranged on the PCB circuit board 602 .

The PCB circuit board 602 is used as the medium for the electrical connection of the controller, the temperature detection part 4 and the pressure detection part 5, and is fixed on the base 601. The base 601 isolates the first installation cavity 201 and the second installation cavity 202 to avoid water vapor and dust The sundries and other sundries enter the first installation cavity 201 along the protective tube 3 , the third installation cavity 203 , and the second installation cavity 202 to ensure the safety of the flexible circuit components in the first installation cavity 201 . The temperature detection part 4 and the pressure detection part 5 transmit the detection results to the controller, and the controller feeds back the information to the flexible circuit part after analysis, and then the flexible circuit part outputs the information to the external equipment.

It should be noted that the pressure detection part 5 is soldered on the PCB circuit board 602 and has four soldering points. The electrical connection between the pressure detection element 5 and the PCB circuit board 602 can be realized by welding.

Optionally, the base 601 is prepared by a glass-to-metal sintering process, and the PCB circuit board 602 is welded to the base 601 .

Optionally, a sealing hole is opened on the base 601, and a metal pin 605 for transmitting electrical signals is pierced in the sealing hole. One end of the metal pin 605 is connected to the PCB circuit board 602, and the other end is connected to the flexible circuit. Used to transmit electrical signals to flexible circuit components. In order to ensure the airtightness of the base 601, the base 601 is first used to fill the sealing hole of the metal pin 605 with a glass body, and the metal pin 605 is limited in the sealing hole by means of the glass high-temperature sintering molding process, so as to realize isolation while ensuring Tightness at the sealing hole.

In some embodiments, please refer to FIG. 4 to FIG. 6, the flexible circuit component includes a flexible circuit board 603 and a conductive connecting piece 604, the flexible circuit board 603 is arranged in the first installation cavity 201, and is electrically connected with the PCB circuit board 602; One end of the connection piece 604 is electrically connected to the flexible circuit board 603 , and the other end extends out of the first installation cavity 201 along the axial direction of the sealing head 1 . The conductive connection piece 604 is used for electrical connection with external devices.

The conductive connecting sheet 604 electrically connects the flexible circuit board 603 with external devices, so as to transmit signals on the flexible circuit board 603 to the external devices.

Specifically, the flexible circuit board 603 is provided with a signal transmission component capable of receiving signals from the PCB circuit board 602 (the controller is electrically connected to the flexible circuit board 603 through the PCB circuit board 602 ) and transmitting the signals to external devices.

In some embodiments, please refer to FIG. 4 to FIG. 5 , the base 601 is interference fit with the second installation cavity 202 .

The base 601 is interference-fitted with the second installation cavity 202 , so as to isolate the second installation cavity 202 from the first installation cavity 201 and improve the sealing performance in the first installation cavity 201 . Compared with the traditional method of welding the base 601 and the second installation cavity 202 to achieve sealing, the solution in this embodiment has a better sealing effect, and the space in the second installation cavity 202 is limited, so welding is not easy to operate. In addition, if the solder joints are not firm, the base 601 is easily separated from the second installation cavity 202 .

In some embodiments, please refer to FIG. 4 to FIG. 5 , the base 601 is a conical member, and the diameter of the base 601 gradually decreases along the first direction.

Since the inner diameter of the first installation cavity 201 is greater than the inner diameter of the second installation cavity 202, the base 601 can be placed along the first direction from the first installation cavity 201, and the diameter of the base 601 gradually decreases along the first direction, thereby facilitating the installation of the base. The base 601 is inserted into the second installation cavity 202, and as the diameter of the base 601 gradually increases, the base 601 and the second installation cavity 202 are in close contact to realize a sealed connection.

In some embodiments, please refer to FIG. 6 , the temperature detecting element 4 includes a detecting element 402 and a connecting element 401, the detecting element 402 is located in the protective tube 3 for sensing temperature; the base 601 is provided with a cooling groove 6011 along the first direction , the PCB circuit board 602 covers the opening of the heat sink 6011 , and the PCB circuit board 602 is provided with a relief hole matching the connection element 401 , and the connection element 401 is inserted into the heat dissipation groove 6011 through the relief hole.

The PCB circuit board 602 will generate a lot of heat when it is working, and the heat dissipation groove 6011 can quickly dissipate the heat generated by the PCB circuit board 602 to improve the service life of the PCB circuit board. In addition, the heat sink 6011 can also reduce the weight of the base 601 and avoid being separated from the second installation cavity 202 under the action of gravity. The connection element 401 is inserted into the heat sink 6011 through the relief hole, and then the connection element 401 is welded to the PCB circuit board 602, not only avoiding damage to the connection element 401, but also welding the connection element 401 from both sides of the PCB circuit board 602 , to increase the stability of the connection.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The temperature and pressure compound sensor is characterized by comprising:

the shell comprises a blocking head, a main body and a protective tube which are sequentially arranged along a first direction, wherein the main body is provided with a first installation cavity, a second installation cavity and a third installation cavity which are mutually communicated along the first direction, the blocking head is connected in the first installation cavity, and the protective tube is connected in the third installation cavity; and

the detection unit is arranged in the first installation cavity and the second installation cavity and comprises a control module, a pressure detection piece and a temperature detection piece, wherein the pressure detection piece and the temperature detection piece are respectively and electrically connected with the control module, and the detection end of the temperature detection piece extends into the protection tube along the first direction.

2. The temperature and pressure composite sensor of claim 1, wherein the first, second and third mounting cavities are cylindrical cavities, and the inner diameters of the first, second and third mounting cavities gradually decrease.

3. The temperature and pressure composite sensor according to claim 1, wherein the plugging head comprises a fixing portion and a connecting portion arranged along the first direction, the connecting portion is inserted into the first installation cavity, a containing cavity is formed in the connecting portion, and the containing cavity is communicated with the first installation cavity in the first direction.

4. The temperature and pressure composite sensor according to claim 3, wherein the fixing portion is provided with a connection groove along the first direction, and the connection groove is used for being in plug-in fit with external equipment.

5. The temperature and pressure composite sensor according to claim 4, wherein a plurality of cutting bars arranged along the first direction are arranged on the inner wall of the connecting groove, and the cutting bars are used for being spliced with external equipment.

6. The temperature and pressure composite sensor of claim 1, wherein the control module comprises:

the flexible circuit piece is arranged in the first mounting cavity and is used for being electrically connected with external equipment;

the base is arranged in the second mounting cavity and is electrically connected with the flexible circuit member, and the base isolates the second mounting cavity from the first mounting cavity;

the PCB circuit board is arranged on the base and is respectively and electrically connected with the pressure detection piece, the temperature detection piece and the flexible circuit piece, and the pressure detection piece is welded on the PCB circuit board; and

and the controller is arranged on the PCB.

7. The temperature and pressure composite sensor of claim 6, wherein the flexible circuit member comprises:

the flexible circuit board is arranged in the first mounting cavity and is electrically connected with the PCB circuit board; and

one end of the conductive connecting sheet is electrically connected with the flexible circuit board, the other end of the conductive connecting sheet extends out of the first mounting cavity along the axial direction of the blocking head, and the conductive connecting sheet is used for being electrically connected with external equipment.

8. The temperature and pressure composite sensor of claim 6, wherein the base is an interference fit with the second mounting cavity.

9. The temperature and pressure composite sensor according to claim 8, wherein the base is a circular truncated cone-shaped member, and the diameter of the base gradually decreases in the first direction.

10. The temperature and pressure composite sensor according to claim 6, wherein the temperature detecting member comprises a detecting element and a connecting element, the detecting element being located in the protective tube for sensing temperature; the base is provided with a heat dissipation groove along the first direction, the PCB is covered on the opening of the heat dissipation groove, the PCB is provided with a yielding hole matched with the connecting element, and the connecting element penetrates through the yielding hole and is inserted into the heat dissipation groove.

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