External pressure and temperature and humidity integrated sensor

Abstract

The invention relates to the technical field of sensors, in particular to an external pressure and temperature and humidity integrated sensor which comprises a base, a pressure sensing unit and a temperature and humidity sensing unit. The pressure sensing unit comprises an elastic stress body, a sensing piece attached to the elastic stress body and a pressure circuit board electrically connected with the sensing piece, and the temperature and humidity sensing unit comprises a temperature and humidity sensing module and a temperature and humidity circuit board which are arranged at an outlet of the second flow channel. The temperature and humidity circuit board and the pressure circuit board are distributed up and down and are electrically connected; pressure detection and temperature and humidity detection are separated through the double-flow-channel outlets, detected fluid enters the two flow channel outlets under the condition that it is guaranteed that the pressure is not lost, and therefore real-time monitoring of the temperature, the pressure and the humidity is achieved, and the temperature and humidity circuit board and the pressure circuit board are of an upper and lower split structure; and the anti-interference capability is improved while the miniaturization of the sensor is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to an external pressure and temperature and humidity integrated sensor. Background Art

[0002] With the development of automobile electrification, some mid-to-high-end models are equipped with air suspension. The air suspension system can raise or lower the chassis height according to the ups and downs of the road, so that the vehicle can adapt to driving needs under various road conditions and improve driving comfort. The core of air suspension is to set up an air chamber. By changing the volume of the air chamber, the distance between the vehicle body and the ground can be adjusted and the soft and hard characteristics can be changed to a certain extent. Therefore, a pressure sensor is needed to monitor the air chamber pressure. While detecting the ambient pressure, it is also necessary to detect the surrounding humidity and temperature to prevent the influence of humidity on pressure and excessive humidity from affecting the stability and life of certain components. At present, most sensors with pressure detection can only detect pressure (single P or dual P output), or some can detect pressure and temperature (P+T output). However, the size of sensors that can detect pressure and temperature at the same time is large, resulting in a large space occupation and does not meet the needs of miniaturization. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the sensors that can simultaneously detect pressure and temperature in the prior art are all large in size, resulting in a large occupied space and not meeting the miniaturization requirements, an external pressure and temperature and humidity integrated sensor is now provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: an external pressure and temperature and humidity integrated sensor, comprising: A base, wherein a detection flow channel is formed inside thereof for the flow of the measured fluid, wherein one end of the detection flow channel is a flow channel inlet, and the other end has a first flow channel outlet and a second flow channel outlet; The pressure sensing unit comprises an elastic force-bearing body, a sensing sheet attached to the elastic force-bearing body, and a pressure circuit board electrically connected to the sensing sheet, wherein a fluid channel connected to the first flow channel outlet is formed inside the elastic force-bearing body, and an end of the elastic force-bearing body away from the first flow channel outlet is a sensing end, and the sensing sheet is attached to the sensing end; And a temperature and humidity sensing unit, including a temperature and humidity sensing module and a temperature and humidity circuit board arranged at the outlet of the second flow channel, wherein the temperature and humidity circuit board and the pressure circuit board are distributed up and down and are electrically connected.

[0005] Furthermore, the temperature and humidity sensing unit is embedded in the second flow channel outlet, and the outer peripheral wall of the temperature and humidity sensing unit and the inner peripheral wall of the second flow channel outlet are adhesively sealed.

[0006] Furthermore, the center line of the elastic force-bearing body deviates from the center line of the pressure circuit board.

[0007] Furthermore, a connecting terminal is provided between the temperature and humidity circuit board and the pressure circuit board, and one end of the connecting terminal is formed as a plug-in end with a fisheye-shaped slot inside.

[0008] Furthermore, the base includes a threaded tube body for connecting to an external pipeline and a disc body provided with the first flow channel outlet and the second flow channel outlet.

[0009] Furthermore, the sensor also includes a shell having an installation cavity, the pressure sensing unit and the temperature and humidity sensing unit are both arranged in the installation cavity, the outer peripheral wall of the disk body is radially contracted to form a mounting surface for the shell to be installed, and the shell has an inner flange abutting the mounting surface.

[0010] Furthermore, the middle portion of the elastic force-bearing body contracts to form a blocking portion for blocking the installation stress from the installation surface.

[0011] Furthermore, the housing is radially extended to form a supporting portion for supporting the pressure circuit board, and a gasket is provided between the supporting portion and the pressure circuit board, and the gasket is bent toward the direction of the pressure circuit board to form a clamping portion for clamping the pressure circuit board.

[0012] Furthermore, the temperature and humidity sensing module has a contact end at one end that contacts the fluid in the detection channel, and a sealing end that protrudes radially at the other end to seal the second channel outlet. A sealing surface is formed between the contact end and the sealing end, and a sealant is filled between the sealing surface and the inner circumferential wall of the second channel outlet to seal the two.

[0013] Furthermore, the disc body extends in the direction of the elastic force-bearing body to form a slot, and the elastic force-bearing body is contracted at one end close to the disc body to form a clamping portion for clamping into the slot.

[0014] Beneficial effects of the present invention: The present invention utilizes a dual flow channel outlet to separate pressure detection from temperature and humidity detection, so that the measured fluid enters the two flow channel outlets separately while ensuring that the pressure is not lost, thereby realizing real-time monitoring of temperature, pressure and humidity. The temperature and humidity circuit board and the pressure circuit board adopt an upper and lower split structure, which improves the anti-interference ability while realizing the miniaturization of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention; Figure 2 It is a front view of the present invention; Figure 3 yes Figure 2 Section view in AA direction; Figure 4 This is a front view of the present invention after removing the outer shell; Figure 5 is a three-dimensional schematic diagram of the present invention after removing the outer shell; Figure 6 is an exploded view of the present invention; Figure 7 It is a structural diagram of an elastic force-bearing body; Figure 8 It is a schematic diagram of the structure of the connection terminal; Fig. 9 It is a schematic diagram of the structure of the gasket.

[0017] In the figure: 1. Base; 101. Detection channel; 102. Channel inlet; 103. First channel outlet; 104. Second channel outlet; 105. Threaded tube; 106. Plate; 1061. Mounting surface; 1062. Card slot; 2. pressure sensing unit; 201. elastic force-bearing body; 2011. fluid channel; 2012. sensing end; 2013. blocking part; 2014. clamping part; 202. sensing sheet; 203. pressure circuit board; 204. connecting line; 3. Temperature and humidity sensing unit; 301. Temperature and humidity sensing module; 3011. Contact end; 3012. Blocking end; 3013. Sealing surface; 302. Temperature and humidity circuit board; 4. Connecting terminal; 401. Plug-in end; 402. Rod body; 403. Guide part; 5. Shell; 501. Mounting cavity; 502. Inner flange; 503. Supporting part; 504. Upper shell; 505. Lower shell; 506. Buckle; 6. Gasket; 601. Clamping part; 7. Seals; 8. Connecting elements. DETAILED DESCRIPTION

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner only, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0019] like Figure 1-Figure 3As shown, an external pressure and temperature and humidity integrated sensor includes a base 1, a pressure sensing unit 2 and a temperature and humidity sensing unit 3; A detection flow channel 101 for the flow of the measured fluid is formed inside the base 1. One end of the detection flow channel 101 is a flow channel inlet 102, and the other end has a first flow channel outlet 103 and a second flow channel outlet 104 arranged in parallel. The pressure sensing unit 2 includes an elastic force-bearing body 201, a sensing sheet 202 attached to the elastic force-bearing body 201, and a pressure circuit board 203 electrically connected to the sensing sheet 202. A connecting wire 204 is provided between the sensing sheet 202 and the pressure circuit board 203. The connecting wire 204 can be, but is not limited to, an aluminum wire, such as Figure 5 As shown; The elastic force-bearing body 201 has a fluid channel 2011 in communication with the first flow channel outlet 103, and the end of the elastic force-bearing body 201 away from the first flow channel outlet 103 is a sensing end 2012, which is a thin-walled structure that can be deformed under the pressure of the fluid in the fluid channel 2011. The sensing sheet 202 is attached to the sensing end 2012, and the attachment process is as follows: first, the sensing end 2012 is attached with glass glue through a silk screen process, and the sensing sheet 202 is attached to the melted glass glue, and then the glass glue is sintered through a special high-temperature tunnel furnace to sinter the sensing sheet 202 and the elastic force-bearing body 201 into one. The fluid entering from the flow channel inlet 102 enters the fluid channel 2011 through the first flow channel outlet 103, and the sensing end 2012 is deformed under pressure, and the resistance of the sensing sheet 202 changes, and then the signal is conditioned by the pressure circuit board 203 to complete high-precision pressure monitoring.

[0020] The temperature and humidity sensing unit 3 includes a temperature and humidity sensing module 301 and a temperature and humidity circuit board 302 arranged in the second flow channel outlet 104. The temperature and humidity circuit board 302 and the pressure circuit board 203 are distributed up and down and are electrically connected. The upper and lower separate settings of the two can maximize the use of the overall space without increasing the overall sensor size, and realize the miniaturization of the sensor. Both circuit boards are reliably grounded, and there is a large distance between the two, the electromagnetic interference is small, and the pressure and temperature and humidity signals do not interfere with each other. The fluid entering the flow channel inlet 102 directly contacts the temperature and humidity sensing unit 3 through the second flow channel outlet 104, obtains a signal, and then transmits it to the pressure circuit board 203 after signal conditioning by the temperature and humidity circuit board 302, thereby realizing the detection of ambient temperature and humidity while detecting pressure.

[0021] During detection, the fluid enters from the flow channel inlet 102, and reaches the pressure sensing unit 2 and the temperature and humidity sensing unit 3 through the first flow channel outlet 103 and the second flow channel outlet 104 respectively, realizing real-time monitoring of temperature, pressure and humidity. This scheme uses a dual-outlet design to separate pressure detection from temperature and humidity detection, so that the measured fluid can enter the two flow channel outlets respectively while ensuring that the pressure is not lost. The two are completely independent and do not interfere with each other. The upper and lower split structures adopted by the temperature and humidity circuit board 302 and the pressure circuit board 203 achieve miniaturization of the sensor while having less interference.

[0022] In some examples, such as Figure 3 As shown, the temperature and humidity sensing unit 3 is embedded in the second flow channel outlet 104 to form a preliminary seal, and the outer peripheral wall of the temperature and humidity sensing unit 3 and the inner peripheral wall of the second flow channel outlet 104 are adhesively sealed to form a complete seal, thereby sealing the measured fluid at the bottom of the temperature and humidity sensing unit 3 without affecting the upper pressure detection.

[0023] In some examples, such as Figure 3 and Figure 4 As shown, the center line of the elastic force-bearing body 201 deviates from the center line of the pressure circuit board 203, that is, the elastic force-bearing body 201 is biased to one side of the pressure circuit board 203 to leave enough space for the temperature and humidity sensing unit 3 to achieve miniaturization of the sensor.

[0024] In some examples, such as Figure 3 and Figure 4 As shown, a connecting terminal 4 is provided between the temperature and humidity circuit board 302 and the pressure circuit board 203, and the connecting terminal 4 includes a rod body 402, one end of the rod body 402 is formed as a plug-in end 401 with a fisheye-shaped slot inside, which is used to insert the pressure circuit board 203 and pass through. When the plug-in end 401 is inserted into the pressure circuit board 203, it can be retracted into the pressure circuit board 203 with the help of the fisheye-shaped slot under the squeezing action of the pressure circuit board 203. Under the action of the fisheye-shaped slot, the plug-in end 401 can always keep in contact with the pressure circuit board 203 to ensure the stability of the signal; as shown Figure 6 and Figure 8 As shown, a guide portion 403 is provided on the plug end 401 to facilitate the plug end 401 to be inserted into the pressure circuit board 203, and the other end of the rod body 402 is inserted into the temperature and humidity circuit board 302 to electrically connect the temperature and humidity circuit board 302 with the pressure circuit board 203.

[0025] In some examples, such as Figure 1-Figure 3As shown, the base 1 includes a threaded tube body 105 for connecting to an external pipeline and a disk body 106 provided with the above-mentioned first flow channel outlet 103 and the second flow channel outlet 104. The threaded tube body 105 is provided with an external thread on the outside and the above-mentioned detection flow channel 101 is formed on the inside. The disk body 106 is provided with an annular groove for the threaded tube body 105 to be inserted into on the side opposite to the threaded tube body 105. The threaded tube body 105 is inserted into the annular groove to achieve relative fixation of the two.

[0026] In some examples, such as Figure 1-Figure 3 As shown, the sensor also includes a shell 5 with an installation cavity 501, the shell 5 includes a lower shell 505 and an upper shell 504, the upper shell 504 is connected to the host computer MCU, the lower shell 505 is bent in the direction of the upper shell 504 to form a buckle 506 for fixing the two, the upper shell 504 includes a plug-in part inserted into the lower shell 505, a cover part that rests on the top of the lower shell 505 and cooperates with the buckle 506, and an extension part extending upward from the cover part, and the bottom of the extension part is blocked to form a closed installation cavity 501.

[0027] The pressure sensing unit 2 and the temperature and humidity sensing unit 3 are both arranged in the installation cavity 501, and a sealing member 7 is installed between the pressure circuit board 203 and the cavity wall of the installation cavity 501. Figure 3 As shown, a connecting element 8 is also provided in the installation cavity 501, one end of the connecting element 8 is connected to the pressure circuit board 203, and the other end extends out of the installation cavity 501, the outer peripheral wall of the disk body 106 is radially contracted to form a mounting surface 1061 for mounting the outer shell 5, and the outer shell 5 has an inner flange 502 abutting against the mounting surface 1061, and the inner flange 502 is formed by bending the bottom end of the outer shell 5 inward.

[0028] In some examples, such as Figure 3 and Figure 7 As shown, the middle portion of the elastic force-bearing body 201 shrinks to form a blocking portion 2013 for blocking the installation stress from the installation surface 1061. Installation stress will be generated when the housing 5 is installed. The shrinking blocking portion 2013 can block most of the installation stress, so that the installation stress reaching the sensing end 2012 is greatly reduced, thereby improving the accuracy of the sensor.

[0029] In some examples, such as Figure 3 and Fig. 9 As shown, the shell 5 extends radially to form a supporting portion 503 for supporting the pressure circuit board 203, and a gasket 6 is provided between the supporting portion 503 and the pressure circuit board 203. The gasket 6 is bent toward the direction of the pressure circuit board 203 to form a clamping portion 601 for clamping the pressure circuit board 203. The number of the clamping portions 601 may be but is not limited to one, two or three, etc., and slots are provided on both sides of the clamping portion 601, which facilitates the bending of the clamping portion 601 into shape.

[0030] In some examples, such as Figure 3 As shown, the temperature and humidity sensing module 301 has a contact end 3011 formed at one end for contacting the fluid in the detection channel 101, and a blocking end 3012 protruding radially at the other end for blocking the second channel outlet 104, that is, the temperature and humidity sensing module 301 is generally T-shaped, and a sealing surface 3013 is formed between the contact end 3011 and the blocking end 3012, and a gap is left between the sealing surface 3013 and the inner peripheral wall of the second channel outlet 104, and the gap is filled with a sealant for gluing the two together; The temperature and humidity circuit board 302 is covered on top of the temperature and humidity sensing module 301 and is adhesively sealed to the inner wall of the second flow channel outlet 104 to further block the second flow channel outlet 104. The temperature and humidity circuit board 302 protrudes radially from the temperature and humidity sensing module 301 to form a first step surface, and the upper end of the second flow channel outlet 104 protrudes radially to form a second step surface abutting the first step surface.

[0031] In some examples, such as Figure 3 As shown, the disk body 106 extends toward the direction of the elastic force-bearing body 201 to form a slot 1062, and the elastic force-bearing body 201 is contracted at one end close to the disk body 106 to form a snap-in portion 2014 for snapping into the slot 1062. The snap-in portion 2014 snaps into the slot 1062 to relatively fix the disk body 106 and the elastic force-bearing body 201.

[0032] Working principle: During detection, the fluid enters from the flow channel inlet 102, and reaches the pressure sensing unit 2 and the temperature and humidity sensing unit 3 respectively through the first flow channel outlet 103 and the second flow channel outlet 104, wherein the fluid flowing out from the first flow channel outlet 103 enters the elastically stressed fluid channel 2011, the sensing end 2012 is deformed under pressure, and the resistance of the sensing sheet 202 changes, and then the signal is conditioned by the pressure circuit board 203 to complete high-precision pressure monitoring; the fluid at the second flow channel outlet 104 is in direct contact with the temperature and humidity sensing unit 3 to obtain a signal, which is then transmitted to the pressure circuit board 203 after signal conditioning by the temperature and humidity circuit board 302, and finally the signal is output through the connecting element 8, thereby realizing the detection of ambient temperature and humidity while detecting pressure.

[0033] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An external integrated pressure and temperature and humidity sensor, characterized in that: include: A base (1) having a detection flow channel (101) formed therein for the flow of a measured fluid, wherein one end of the detection flow channel (101) is a flow channel inlet (102), and the other end has a first flow channel outlet (103) and a second flow channel outlet (104); A pressure sensing unit (2), comprising an elastic force-bearing body (201), a sensing sheet (202) attached to the elastic force-bearing body (201), and a pressure circuit board (203) electrically connected to the sensing sheet (202); a fluid channel (2011) communicating with a first flow channel outlet (103) is formed inside the elastic force-bearing body (201); an end of the elastic force-bearing body (201) away from the first flow channel outlet (103) is a sensing end (2012); and the sensing sheet (202) is attached to the sensing end (2012); and a temperature and humidity sensing unit (3), comprising a temperature and humidity sensing module (301) and a temperature and humidity circuit board (302) arranged in the second flow channel outlet (104), wherein the temperature and humidity circuit board (302) and the pressure circuit board (203) are arranged vertically and electrically connected to each other.

2. The external integrated pressure and temperature and humidity sensor according to claim 1, characterized in that: The temperature and humidity sensing unit (3) is embedded in the second flow channel outlet (104), and the outer peripheral wall of the temperature and humidity sensing unit (3) and the inner peripheral wall of the second flow channel outlet (104) are glued and sealed.

3. The external integrated pressure and temperature and humidity sensor according to claim 1, characterized in that: The center line of the elastic force-bearing body (201) deviates from the center line of the pressure circuit board (203).

4. The external integrated pressure and temperature and humidity sensor according to claim 1, characterized in that: A connection terminal (4) is provided between the temperature and humidity circuit board (302) and the pressure circuit board (203), and one end of the connection terminal (4) is formed as a plug-in terminal (401) having a fisheye-shaped slot provided therein.

5. The external integrated pressure and temperature and humidity sensor according to claim 1, characterized in that: The base (1) comprises a threaded pipe body (105) for connecting to an external pipeline and a disc body (106) provided with the first flow channel outlet (103) and the second flow channel outlet (104).

6. The external integrated pressure and temperature and humidity sensor according to claim 5, characterized in that: The sensor further comprises a housing (5) having a mounting cavity (501), the pressure sensing unit (2) and the temperature and humidity sensing unit (3) being both arranged in the mounting cavity (501), the outer peripheral wall of the disk body (106) shrinking in the radial direction to form a mounting surface (1061) for mounting the housing (5), and the housing (5) having an inner flange (502) abutting against the mounting surface (1061).

7. The external integrated pressure and temperature and humidity sensor according to claim 6, characterized in that: The middle portion of the elastic force-bearing body (201) contracts to form a blocking portion (2013) that blocks the installation stress from the installation surface (1061).

8. The external integrated pressure and temperature and humidity sensor according to claim 6, characterized in that: The housing (5) extends radially to form a supporting portion (503) for supporting the pressure circuit board (203), and a gasket (6) is provided between the supporting portion (503) and the pressure circuit board (203), and the gasket (6) is bent in the direction of the pressure circuit board (203) to form a clamping portion (601) for clamping the pressure circuit board (203).

9. The external integrated pressure and temperature and humidity sensor according to claim 2, characterized in that: The temperature and humidity sensing module (301) has a contact end (3011) formed at one end for contacting the fluid in the detection channel (101), and a blocking end (3012) protruding radially at the other end for blocking the second channel outlet (104), a sealing surface (3013) being formed between the contact end (3011) and the blocking end (3012), and a sealant is filled between the sealing surface (3013) and the inner peripheral wall of the second channel outlet (104) for bonding the two together.

10. The external integrated pressure and temperature and humidity sensor according to claim 5, characterized in that: The disc body (106) extends in the direction of the elastic force-bearing body (201) to form a slot (1062), and one end of the elastic force-bearing body (201) close to the disc body (106) is contracted to form a snap-fitting portion (2014) for snapping into the slot (1062).

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