A humidity sensor

Abstract

The utility model discloses a kind of humidity sensors, comprising: shell, with containing cavity, and detection flow channel;Detection component, including the PCB board being set in containing cavity, and the sensor unit being set in detection flow channel, and with PCB board electric connection, first limit piece, set in containing cavity, and with the front end surface of PCB board abuts;Second limit piece, from the rear end of containing cavity is loaded, and with the rear end surface of PCB board abuts, the first limit piece is fixedly connected with shell;The PCB board is provided with the electrically conductive member passing through second limit piece, the PCB board is electrically connected with external electric component by electrically conductive member, the present application need not to adopt screw fixed PCB board, make assembly simple, and conducive to miniaturization;The utility model relates to the technical field of sensor.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and more specifically to a humidity sensor. Background Technology

[0002] In current humidity sensor technology, PCB boards are mostly secured with screws. This method has several drawbacks; when high precision is required during assembly, the assembly process is relatively cumbersome. Furthermore, screw fixing makes the overall structure more complex, which is not conducive to the miniaturization and flattening design of the sensor; On the other hand, drilling holes in the PCB board to install screws can easily lead to stress concentration, affecting the performance and lifespan of the PCB board. Utility Model Content

[0003] The purpose of this invention is to provide a humidity sensor that does not require screws to fix the PCB board, making assembly simple and facilitating miniaturization.

[0004] A humidity sensor, comprising: The housing has a receiving cavity and a detection flow channel; The detection assembly includes a PCB board disposed within the accommodating cavity and a sensor unit disposed within the detection flow channel and electrically connected to the PCB board. The first limiting member is set inside the accommodating cavity and abuts against the front end face of the PCB board; The second limiting member is inserted from the rear end of the accommodating cavity and abuts against the rear end face of the PCB board; the first limiting member is fixedly connected to the housing. The PCB board is provided with a conductive element that passes through the second limiting member, and the PCB board is electrically connected to external electrical components through the conductive element.

[0005] With the above structure, the humidity sensor of this utility model has the following advantages compared with the prior art: The PCB board is secured using a screwless design: the front end of the PCB board is stopped by the boss, and the rear end is stopped by a second limiting member fixed to the rear end of the receiving cavity, thus ensuring a stable connection of the PCB board within the receiving cavity. Compared with the traditional method of fixing the PCB board with screws, the structure of this application is more compact, which is conducive to the overall miniaturization design. The screwless connection method does not require high precision, is easier to assemble, and eliminates the stress concentration problem caused by drilling holes in the PCB board.

[0006] As an improvement of this utility model, an inwardly extending boss is provided inside the accommodating cavity as the first limiting member, and the tail end face of the boss abuts against the area near the outer side of the front end face of the PCB board.

[0007] As an improvement of this utility model, the second limiting member includes a retainer and a guide post, wherein the retainer is made of plastic. The retainer is a circular, sheet-like structure and is embedded in the front end face of the guide post. The front end face of the retainer abuts against the rear end face of the PCB board.

[0008] As an improvement to this utility model The guide post is made of metal. The guide post is fixed to the metal housing by welding.

[0009] As an improvement to this utility model, it also includes a shell, which has an inner hole. The tail end of the inner hole tapers inward to form a concave portion, and the front end of the inner hole is open. The shell is fitted from the tail end of the shell until it approaches the front end of the shell. The shell is fixedly connected to the shell. An end cap is provided between the inner portion and the tail end of the guide post.

[0010] As an improvement of this utility model, the end cap is made of plastic and has a through hole. The through hole forms a communication structure with the holes on the retainer and the guide post so that the conductive component can pass through. The inner wall of the cage's bore and the inner wall of the through hole are in contact with the circumferential surface of the conductive component, providing support for the conductive component.

[0011] As an improvement of this utility model, the detection channel is located at the front end of the accommodating cavity and is connected to the accommodating cavity. The sensor unit includes a PCBA board and a sensor electrically connected to the PCBA board. The tail end of the PCBA board is inserted and fixed to the PCB board to achieve electrical connection. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0014] Figure 3 This is a schematic diagram of the structure of this utility model after removing the outer shell.

[0015] Figure 4 This is a schematic diagram of the cage and guide post structure of this utility model.

[0016] The figure shows: 1. Housing; 1.1. Receiving cavity; 1.2. Detection channel; 2. PCB board; 2.1. Conductive component; 3. Sensor unit; 3.1. PCBA board; 3.2. Sensor; 4. First limiting component; 5. Second limiting component; 5.1. Cage; 5.2. Guide post; 6. Outer shell; 6.1. Inner hole; 6.2. Inner section; 7. End cap; 7.1. Through hole; 8. Sealing ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Please see Figure 1-4 As shown, A humidity sensor, comprising: The housing 1 has a receiving cavity 1.1 and a detection flow channel 1.2; The detection assembly includes a PCB board 2 disposed within the accommodating cavity 1.1 and a sensor unit 3 disposed within the detection flow channel 1.2 and electrically connected to the PCB board 2. The first limiting member 4 is disposed in the accommodating cavity 1.1 and abuts against the front end face of the PCB board 2; The second limiting member 5 is inserted from the rear end of the accommodating cavity 1.1 and abuts against the rear end face of the PCB board 2; the first limiting member 4 is fixedly connected to the housing 1. The PCB board 2 is provided with a conductive element 2.1 that passes through the second limiting element 5, and the PCB board 2 is electrically connected to external electrical components through the conductive element 2.1.

[0019] The PCB board 2 is electrically connected to external electrical components (such as a controller for receiving data from the sensor 3.2) via conductive parts 2.1. In actual operation, when the medium flows through the detection channel 1.2, the sensor 3.2 can accurately acquire relevant data of the medium (such as temperature, humidity, etc.) and promptly feed this data back to the external electrical components.

[0020] The PCB board 2 is fixed in place using a screwless design: the front end face of the PCB board 2 is stopped by the boss, and the rear end face is stopped by the second limiting member 5 fixed to the rear end of the receiving cavity 1.1, thus ensuring that the PCB board 2 is securely connected within the receiving cavity 1.1. Compared with the traditional method of fixing the PCB board 2 with screws, the structure of this application is more compact, which is conducive to the overall miniaturization design. Moreover, the screwless connection method does not require high precision, is easier to assemble, and eliminates the stress concentration problem caused by drilling holes in the PCB board 2.

[0021] As an improvement of this utility model, the cavity 1.1 is provided with an inwardly extending boss as a first limiting member 4, and the tail end face of the boss abuts against the area of ​​the front end face of the PCB board 2 near the outer side.

[0022] The convex outer shell and the outer shell 1 are integrally molded, resulting in higher structural strength and reduced risk of failure. In addition, it is also beneficial for production and manufacturing.

[0023] As an improvement of this utility model, the second limiting member 5 includes a retainer 5.1 and a guide post 5.2. The retainer 5.1 is made of plastic. The cage 5.1 is a circular sheet structure and is embedded in the front end face of the guide post 5.2. The front end face of the cage 5.1 abuts against the rear end face of the PCB board 2.

[0024] Both the PCB board 2 and the cage 5.1 are circular sheet structures, which are more flattened in structure, reduce space occupation, and facilitate miniaturization design. The cage 5.1 is made of plastic and abuts against the rear end face of the PCB board 2, which can play the role of insulation, buffering and stabilizing the PCB board 2, and prevent the PCB board 2 from being damaged by rigid collision due to direct contact with the guide post 5.2.

[0025] As an improvement of this utility model, the guide post 5.2 is made of metal, and the guide post 5.2 is fixed to the metal shell 1 by welding.

[0026] The metal guide post 5.2 has good strength and can be fixedly connected to the housing 1 by welding. The connection between the guide post 5.2 and the housing 1 is stable and has a good structural support, which improves the overall stability and reliability of the sensor 3.2. Laser welding is preferred, which is convenient for processing and manufacturing.

[0027] As an improvement of this utility model, it also includes a shell 6, which has an inner hole 6.1. The tail end of the inner hole 6.1 tapers inward to form an inward portion 6.2, and the front end of the inner hole 6.1 is open. It is inserted from the tail end of the shell 1 until it reaches close to the front end of the shell 1. The shell 6 is fixedly connected to the shell 1. An end cap 7 is provided between the inner portion 6.2 and the tail end of the guide post 5.2.

[0028] The outer shell 6 is made of metal. During assembly, the front end of the inner hole 6.1 is fitted onto the shell 1 and moved forward until the front end of the inner hole 6.1 is close to the front end of the shell 1. The front end of the outer shell 6 and the front end of the shell 1 are also fixed by welding, preferably by laser welding. After the connection is completed, the overall structural strength can be increased; The inner end of the inner hole 6.1 has an inwardly tapered portion 6.2 that abuts against the end of the guide post 5.2. The end cover 7 can further tighten the guide post 5.2, improve structural reliability, and prevent failure of the limiting function.

[0029] As an improvement of this utility model, the end cap 7 is made of plastic and has a through hole 7.1. The through hole 7.1 forms a communication structure with the holes on the retainer 5.1 and the guide post 5.2 so that the conductive component 2.1 can pass through. The inner wall of the cage 5.1 and the inner wall of the through hole 7.1 are in contact with the circumferential surface of the conductive component 2.1, which provides support for the conductive component 2.1, better ensures the stability of the conductive component 2.1, reduces the contact problems caused by the shaking of the conductive component 2.1, and improves the electrical performance and reliability of the sensor 3.2.

[0030] The conductive component 2.1 passes through the retainer 5.1 and the guide post 5.2 and enters into the through hole 7.1 of the end cover 7. The through hole 7.1 can be configured as a plug hole, allowing external electrical components to be electrically connected to the conductive component 2.1 by inserting pins or leads through the through hole 7.1. A rubber sealing ring 8 is also provided between the circumferential surface of the conductive component 2.1 and the inner wall of the hole on the guide post 5.2, which effectively prevents external dust, moisture and other substances from entering the interior of the sensor 3.2, protecting the internal PCB board and detection components.

[0031] As an improvement of this utility model, the detection channel 1.2 is set at the front end of the accommodating cavity 1.1 and is connected to the accommodating cavity 1.1. The sensor unit 3 includes a PCBA board 3.1 and a sensor 3.2 electrically connected to the PCBA board 3.1. The tail end of the PCBA board 3.1 is inserted and fixed to the PCB board 2 and electrically connected.

[0032] The plug-in connection between the PCBA board 3.1 and the PCB board 2 eliminates the need for screws or other fasteners, resulting in a more compact structure and easier assembly and maintenance. Preferably, injection molding can be performed in the detection channel 1.2 to cover the surface of the detection channel 1.2 and the PCBA board 3.1, but leave the sensor 3.2 exposed. This can achieve better sealing performance. At the same time, the injection molded body can better support the PCBA board 3.1, ensuring its stability and improving the overall performance of the sensor 3.2.

[0033] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A humidity sensor, characterized in that, include: The housing (1) has a receiving cavity (1.1) and a detection flow channel (1.2). The detection assembly includes a PCB board (2) disposed in the accommodating cavity (1.1) and a sensor unit (3) disposed in the detection flow channel (1.2) and electrically connected to the PCB board (2). The first limiting member (4) is disposed in the accommodating cavity (1.1) and abuts against the front end face of the PCB board (2); The second limiting member (5) is inserted from the rear end of the receiving cavity (1.1) and abuts against the rear end face of the PCB board (2). The first limiting member (4) is fixedly connected to the housing (1). The PCB board (2) is provided with a conductive element (2.1) passing through the second limiting member (5), and the PCB board (2) is electrically connected to external electrical components through the conductive element (2.1).

2. A humidity sensor according to claim 1, characterized in that: The cavity (1.1) is provided with an inwardly extending boss as the first limiting member (4), and the tail end face of the boss abuts against the area of ​​the front end face of the PCB board (2) near the outside.

3. A humidity sensor according to claim 1, characterized in that: The second limiting member (5) includes a retainer (5.1) and a guide post (5.2), wherein the retainer (5.1) is made of plastic. The retainer (5.1) is a circular sheet structure and is embedded in the front end face of the guide post (5.2). The front end face of the retainer (5.1) abuts against the rear end face of the PCB board (2).

4. A humidity sensor according to claim 3, characterized in that: The guide post (5.2) is made of metal and is fixed to the metal housing (1) by welding.

5. A humidity sensor according to claim 4, characterized in that: It also includes a housing (6), which has an inner hole (6.1), the tail end of which tapers inward to form an inner portion (6.2), the front end of which is open, and is inserted from the tail end of the housing (1) until it approaches the front end of the housing (1). The housing (6) is fixedly connected to the housing (1). An end cap (7) is provided between the inner portion (6.2) and the tail end of the guide post (5.2).

6. A humidity sensor according to claim 5, characterized in that: The end cap (7) is made of plastic and has a through hole (7.1). The through hole (7.1) forms a communication structure with the holes on the retainer (5.1) and the guide post (5.2) so that the conductive component (2.1) can pass through. The inner wall of the cage (5.1) and the inner wall of the through hole (7.1) are in contact with the circumferential surface of the conductive component (2.1), providing support for the conductive component (2.1).

7. A humidity sensor according to claim 1, characterized in that: The detection channel (1.2) is located at the front end of the accommodating cavity (1.1) and is connected to the accommodating cavity (1.1). The sensor unit (3) includes a PCBA board (3.1) and a sensor (3.2) electrically connected to the PCBA board (3.1). The tail end of the PCBA board (3.1) is inserted and fixed to the PCB board (2) and electrically connected.

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