Temperature and humidity sensing device

Abstract

The utility model relates to the technical field of temperature and humidity detection equipment, and particularly discloses a temperature and humidity sensing device. The device comprises a shell defining a containing cavity, a PCB arranged in the containing cavity and a flow guide fixing piece. The shell comprises a main body plate, a containing groove is concavely formed in the side, located in the containing cavity, of the main body plate, and a through hole is formed in the groove bottom of the containing groove and communicates the interior and the exterior of the shell; the PCB comprises a circuit board main body and a temperature and pressure sensor fixedly arranged on one side of the circuit board main body; a vent hole penetrates through the flow guide fixing piece; the waterproof breathable film is attached to the groove bottom of the containing groove, the flow guide fixing piece is clamped between the waterproof breathable film and the PCB, a test space is defined by the vent hole, the circuit board body and the waterproof breathable film, the temperature and pressure sensor is located in the test space, and the test space is communicated with the through hole through the waterproof breathable film. By means of the design that the temperature and pressure sensor is arranged in the testing space, the device can accurately sense the temperature and the humidity of the surrounding gas outside the shell. And meanwhile, the waterproof performance is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature and humidity detection equipment, in particular to a temperature and humidity sensing device. Background Art

[0002] A sensor is a device that receives signals or stimuli and reacts. It can convert the physical or chemical quantity to be measured into another corresponding output. It is used in automation control, security equipment, etc. In stimulus management, in order to obtain electrical stimulation, electronic stimulation devices are mostly used during this period. Temperature and humidity sensing devices are used to sense the temperature and humidity in the environment. The temperature and humidity sensing device is provided with a display screen for displaying data.

[0003] However, when the existing temperature and humidity sensing device senses the temperature and humidity of the surrounding gas outside the shell, the temperature and pressure sensor therein is affected by the heat generated by other components on the circuit board, resulting in inaccurate measurement results of the temperature and humidity of the gas. Considering the large space inside the shell, the measurement time required is long. Therefore, it is difficult to achieve rapid sensing of the temperature and humidity of the gas. Utility Model Content

[0004] The purpose of the utility model is to provide a temperature and humidity sensing device to sense the temperature and humidity of the surrounding gas outside the shell, avoiding the influence of heating of other components on the PCB on the measurement result, and also improving the waterproof performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A temperature and humidity sensing device comprises a shell, a PCB, a flow guide fixture and a waterproof breathable membrane; the shell forms a receiving cavity, the shell comprises a main body plate, a side of the main body plate located in the receiving cavity is provided with a receiving groove, a bottom of the receiving groove is provided with a through hole, and the through hole communicates with the inside and outside of the shell; the PCB is fixedly installed in the receiving cavity, the PCB comprises a circuit board body and a temperature and pressure sensor fixed on one side of the circuit board body; the flow guide fixture is placed in the receiving cavity, the flow guide fixture is detachably connected to the shell, and the flow guide fixture is penetrated with a vent; the waterproof breathable membrane is attached to the bottom of the receiving groove, the flow guide fixture is clamped between the waterproof breathable membrane and the PCB, the vent, the circuit board body and the waterproof breathable membrane form a test space, the temperature and pressure sensor is located in the test space, and the test space is connected with the through hole through the waterproof breathable membrane.

[0007] As an optional technical solution for the temperature and humidity sensing device, the shell also includes a plurality of positioning columns, which are fixed to one side of the main body plate located in the accommodating cavity and surround the accommodating groove; the flow guide fixing member also has a plurality of positioning holes, the number of the positioning holes is the same as the number of the positioning columns, and each of the positioning columns is connected to one of the positioning holes.

[0008] As an optional technical solution for the temperature and humidity sensing device, the guide fixing component includes a fixing plate and a first annular component, the vent hole passes through the fixing plate, the positioning hole passes through the fixing plate, the first annular component is fixed to one side of the fixing plate, the end of the first annular component away from the fixing plate is pressed against the waterproof breathable membrane, the axis of the first annular component coincides with the axis of the vent hole, and the side of the fixing plate provided with the first annular component is in contact with the side of the main plate located in the accommodating cavity.

[0009] As an optional technical solution for the temperature and humidity sensing device, the guide fixture also includes a second annular member, which is fixed to the other side of the fixing plate, the axis of the second annular member coincides with the axis of the vent hole, and the end of the second annular member away from the fixing plate is pressed against the circuit board body.

[0010] As an optional technical solution of the temperature and humidity sensing device, the inner diameter of the first annular member is larger than the aperture of the vent hole.

[0011] As an optional technical solution for the temperature and humidity sensing device, the length direction of the positioning column is perpendicular to the plane where the main body plate is located, and the length direction of the ventilation hole is parallel to the length direction of the positioning hole.

[0012] As an optional technical solution of the temperature and humidity sensing device, two positioning posts are provided, and the two positioning posts are symmetrically arranged about the center of the accommodating groove.

[0013] As an optional technical solution for the temperature and humidity sensing device, the waterproof and breathable membrane also includes a waterproof and breathable area and a back glue area surrounding the waterproof and breathable area, the guide fixing member is clamped between the back glue area and the PCB, and the test space is connected to the through hole through the waterproof and breathable area.

[0014] As an optional technical solution of the temperature and humidity sensing device, in a plane parallel to the waterproof breathable membrane, the projection of the waterproof breathable area covers the projection of the vent hole, and the projection of the waterproof breathable area covers the projection of the through hole.

[0015] As an optional technical solution of the temperature and humidity sensing device, the through hole is opened at the center of the bottom of the accommodating groove.

[0016] Beneficial effects of the utility model:

[0017] The temperature and humidity sensing device can achieve the purpose of limiting the waterproof breathable membrane by setting the accommodating groove, reduce the risk of position deviation of the waterproof breathable membrane, ensure the smooth formation of the test space, and ensure the smooth operation of the temperature and pressure sensor. The design of the test space surrounded by the vent hole, the circuit board body and the waterproof breathable membrane can separate the temperature and pressure sensor from other components on the circuit board body in different spaces, so that the temperature and humidity sensing device is not affected by the heating of other components on the circuit board body, and can ensure that the surrounding gas outside the shell can smoothly enter the test space, so as to timely measure the temperature and pressure of the surrounding gas outside the shell, thereby accurately transmitting the temperature and humidity of the surrounding gas outside the shell to the temperature and pressure sensor. The layout of the flow guide fixture clamped between the waterproof breathable membrane and the PCB is adopted, so that the flow guide fixture is closely matched with the circuit board body and the waterproof breathable membrane, thereby ensuring the accurate separation of the test space in the accommodating cavity from other spaces, realizing the effective sealing of the space where the temperature and pressure sensor is located, avoiding the risk of water leakage between the two spaces, and slowing down the transfer of heat between the two spaces. With the provision of a waterproof breathable membrane, combined with the limitation that the waterproof breathable membrane is clamped between the flow guide fixture and the bottom of the accommodating groove, the surrounding gas outside the shell can smoothly enter the test space from the external environment, ensuring that the temperature and pressure sensor can smoothly measure the surrounding gas outside the shell, while also ensuring that water in the external environment will not enter the accommodating cavity, thereby improving the waterproof performance. With the above structure, the temperature and humidity of the surrounding gas outside the shell can be directly sensed quickly using the temperature and pressure sensor, thereby obtaining the measurement results in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial cross-sectional view of the temperature and humidity sensing device provided by the embodiment of the utility model;

[0019] Figure 2 It is a partial bottom view of the housing provided by the embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the waterproof breathable membrane provided by an embodiment of the utility model;

[0021] Figure 4 It is a cross-sectional view of the flow guide fixing member provided in the embodiment of the utility model.

[0022] In the figure:

[0023] 100, housing; 110, main body plate; 111, receiving groove; 112, through hole; 120, positioning column;

[0024] 200, waterproof breathable membrane; 210, adhesive area; 220, waterproof breathable area;

[0025] 300, flow guide fixing member; 310, fixing plate; 311, positioning hole; 312, vent hole; 320, first annular member; 330, second annular member;

[0026] 900, PCB; 910, temperature and pressure sensor; 920, circuit board body. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] like Figures 1 to 4 As shown, the present embodiment provides a temperature and humidity sensing device, including a housing 100, a PCB 900, a guide fixture 300 and a waterproof breathable membrane 200; the housing 100 forms a receiving cavity, the housing 100 includes a main body plate 110, a side of the main body plate 110 located in the receiving cavity is provided with a receiving groove 111, a bottom of the receiving groove 111 is provided with a through hole 112, and the through hole 112 connects the inside and outside of the housing 100; the PCB 900 is fixedly installed in the receiving cavity, the PCB 900 includes a circuit board body 920 and a circuit board body 920 fixedly provided on one side of the circuit board body 920. The temperature and pressure sensor 910; the guide fixture 300 is placed in the accommodating cavity, the guide fixture 300 is detachably connected to the shell 100, and the guide fixture 300 is penetrated by a vent hole 312; the waterproof breathable membrane 200 is attached to the bottom of the accommodating groove 111, the guide fixture 300 is clamped between the waterproof breathable membrane 200 and the PCB900, the vent hole 312, the circuit board body 920 and the waterproof breathable membrane 200 form a test space, the temperature and pressure sensor 910 is located in the test space, and the test space is connected with the through hole 112 through the waterproof breathable membrane 200.

[0032] The temperature and humidity sensing device can achieve the purpose of limiting the waterproof breathable membrane 200 by setting the accommodating groove 111, reduce the risk of positional displacement of the waterproof breathable membrane 200, ensure the smooth formation of the test space, and ensure the smooth operation of the temperature and pressure sensor 910. The design of the test space surrounded by the vent hole 312, the circuit board body 920 and the waterproof breathable membrane 200 can separate the temperature and pressure sensor 910 from other components on the circuit board body 920 in different spaces, so that the temperature and humidity sensing device is not affected by the heating of other components on the circuit board body 920, and can ensure that the surrounding gas outside the shell 100 smoothly enters the test space, so as to timely measure the temperature and pressure of the surrounding gas outside the shell 100, thereby accurately transmitting the temperature and humidity of the surrounding gas outside the shell 100 to the temperature and pressure sensor 910. The layout in which the flow guide fixture 300 is sandwiched between the waterproof breathable membrane 200 and the PCB 900 is adopted, so that the flow guide fixture 300 is closely matched with the circuit board body 920 and the waterproof breathable membrane 200, thereby ensuring the accurate separation of the test space in the accommodating cavity from other spaces, realizing the effective sealing of the space where the temperature and pressure sensor 910 is located, avoiding the risk of water leakage between the two spaces, and slowing down the transfer of heat between the two spaces. With the arrangement of the waterproof breathable membrane 200, combined with the limitation that the waterproof breathable membrane 200 is sandwiched between the flow guide fixture 300 and the bottom of the accommodating groove 111, the surrounding gas outside the housing 100 can smoothly enter the test space from the external environment, ensuring the smooth measurement of the surrounding gas outside the housing 100 by the temperature and pressure sensor 910, and at the same time ensuring that the water in the external environment will not enter the accommodating cavity, thereby improving the waterproof performance. With the above structure, the temperature and humidity of the surrounding gas outside the housing 100 can be directly sensed by the temperature and pressure sensor 910, so as to obtain the measurement results in time.

[0033] In this embodiment, the shell 100 also includes a plurality of positioning columns 120, which are fixedly connected to one side of the main plate 110 located in the accommodating cavity and surround the accommodating groove 111; the guide fixing member 300 also has a plurality of positioning holes 311, the number of the positioning holes 311 is the same as the number of the positioning columns 120, and each positioning column 120 is connected to a positioning hole 311.

[0034] Through the one-to-one plug-in cooperation between the positioning column 120 and the positioning hole 311, the detachable connection of the guide fixture 300 on the shell 100 is achieved, which ensures the relative position fixation of the guide fixture 300 and the shell 100, realizes the rapid disassembly and assembly of the guide fixture 300 on the shell 100, and greatly improves the production efficiency of the temperature and humidity sensing device.

[0035] Furthermore, the guide fixture 300 includes a fixing plate 310 and a first annular member 320, the vent hole 312 passes through the fixing plate 310, the positioning hole 311 passes through the fixing plate 310, the first annular member 320 is fixedly connected to one side of the fixing plate 310, and one end of the first annular member 320 away from the fixing plate 310 is pressed against the waterproof breathable membrane 200, the axis of the first annular member 320 coincides with the axis of the vent hole 312, and the fixing plate 310 is provided with a side of the first annular member 320 that is in contact with the side of the main plate 110 located in the accommodating cavity.

[0036] With the help of the design of the first annular member 320, the diversion fixing member 300 can accurately position the waterproof breathable membrane 200, thereby achieving the purpose of positioning the waterproof breathable membrane 200. The design of the fixing plate 310 and the main plate 110 in contact with each other realizes the effective separation of the accommodating groove 111 and other spaces in the accommodating cavity, prevents water from entering other spaces in the accommodating cavity from the external environment, and slows down the transfer of heat between the two spaces. At the same time, the annular design of the first annular member 320 facilitates the separation of two spaces in the accommodating groove 111, so as to prevent the test space from being connected to the edge of the accommodating groove 111, and further improve the sealing performance of the test space.

[0037] Furthermore, the guide fixture 300 also includes a second annular member 330, which is fixed to the other side of the fixing plate 310, the axis of the second annular member 330 coincides with the axis of the vent 312, and the end of the second annular member 330 away from the fixing plate 310 presses against the circuit board body 920.

[0038] By means of the second annular member 330, the guide fixture 300 can be closely attached to the circuit board body 920, thereby ensuring the sealing effect of the test space, thereby avoiding water leakage between the two spaces and slowing down the transfer of heat between the two spaces.

[0039] In the above design, the first annular member 320 and the second annular member 330 are limited to coincide with the axis of the vent hole 312 , thereby ensuring smooth flow of gas in the flow guiding fixture 300 and reducing the production cost of the flow guiding fixture 300 .

[0040] In this embodiment, the inner diameter of the first annular member 320 is greater than the aperture of the vent hole 312. Specifically, the inner diameter of the second annular member 330 is equal to the aperture of the vent hole 312.

[0041] Through the above definition, the difficulty of installing the guide fixture 300 on the housing 100 is reduced, the space occupied by the guide fixture 300 is reduced, the structure of the guide fixture 300 is simplified, and the production cost is reduced.

[0042] Exemplarily, the length direction of the positioning column 120 is perpendicular to the plane where the main plate 110 is located, and the length direction of the vent hole 312 is parallel to the length direction of the positioning hole 311 .

[0043] By virtue of the limitation that the length direction of the positioning column 120 is perpendicular to the plane where the main plate 110 is located, the manufacturing difficulty of the housing 100 is reduced, and the production cost is reduced. At the same time, the above design also helps to reduce the difficulty of disassembling and assembling the flow guide fixture 300 on the housing 100, greatly improving the production efficiency of the temperature and humidity sensing device. By virtue of the limitation that the length direction of the vent hole 312 is parallel to the length direction of the positioning hole 311, the production cost of the flow guide fixture 300 is reduced, the specific structure of the flow guide fixture 300 is simplified, and it helps to reduce the space occupied by the test space.

[0044] Specifically, the plane where the circuit board body 920 is located is parallel to the plane where the main board 110 is located.

[0045] The above limitations are helpful to achieve optimized design of the structure in the accommodating cavity, help to improve the layout optimization of the space in the temperature and humidity sensing device, and help to reduce the space occupied by the temperature and humidity sensing device.

[0046] In this embodiment, two positioning posts 120 are provided, and the two positioning posts 120 are symmetrically arranged about the center of the accommodating groove 111. The above design realizes a stable connection between the flow guide fixing member 300 and the housing 100, avoids the risk of relative position deviation between the flow guide fixing member 300 and the housing 100, and ensures the long-term stable operation of the temperature and humidity sensing device.

[0047] Exemplarily, the waterproof breathable membrane 200 also includes a waterproof breathable area 220 and an adhesive backing area 210 surrounding the waterproof breathable area 220, the flow guide fixture 300 is sandwiched between the adhesive backing area 210 and the PCB 900, and the test space is connected to the through hole 112 through the waterproof breathable area 220. By distinguishing the waterproof breathable area 220 from the adhesive backing area 210, the waterproof breathable area 220 can be used to play the role of ventilation and waterproofing between the through hole 112 and the test space, and the adhesive backing area 210 can be used to close the edge of the test space, thereby ensuring the stable operation of the temperature and humidity sensing device. The above structural layout is simple and reliable, with low production cost, high working stability and small space occupation.

[0048] Considering the waterproof grade requirement for the waterproof breathable membrane 200, the waterproof breathable membrane 200 is selected between IPX4-IPX8.

[0049] Further, in a plane parallel to the waterproof breathable membrane 200 , the projection of the waterproof breathable area 220 covers the projection of the vent hole 312 , and the projection of the waterproof breathable area 220 covers the projection of the through hole 112 .

[0050] By means of the above-mentioned limitation on the size of the waterproof and breathable area 220, the range of gas exchange between the test space and the through hole 112 can be expanded, the measurement efficiency of the temperature and pressure sensor 910 is improved, and the accuracy of the test results is guaranteed.

[0051] In this embodiment, the through hole 112 is provided at the center of the bottom of the receiving groove 111. The above design defines the relative position of the through hole 112 and the receiving groove 111, and also causes the waterproof breathable area 220 to be precisely located at the center of the waterproof breathable membrane 200. Through the above layout position planning, the difficulty of installing the waterproof breathable membrane 200 in the receiving groove 111 is reduced, the situation of incorrect assembly of the waterproof breathable membrane 200 is avoided, and the assembly efficiency of the temperature and humidity sensing device is improved.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A temperature and humidity sensing device, characterized in that: include: A housing (100) is surrounded by a receiving cavity, the housing (100) comprising a main body plate (110), a receiving groove (111) is recessed on one side of the main body plate (110) located in the receiving cavity, a through hole (112) is formed at the bottom of the receiving groove (111), and the through hole (112) communicates with the inside and outside of the housing (100); A PCB (900) is fixedly installed in the accommodating cavity, wherein the PCB (900) comprises a circuit board body (920) and a temperature and pressure sensor (910) fixedly arranged on one side of the circuit board body (920); A flow guiding fixing member (300) is placed in the accommodating cavity, the flow guiding fixing member (300) is detachably connected to the housing (100), and a vent hole (312) is passed through the flow guiding fixing member (300); The waterproof breathable membrane (200) is attached to the bottom of the accommodating groove (111); the flow guide fixing member (300) is clamped between the waterproof breathable membrane (200) and the PCB (900); the vent hole (312), the circuit board body (920) and the waterproof breathable membrane (200) form a test space; the temperature and pressure sensor (910) is located in the test space; and the test space is connected to the through hole (112) through the waterproof breathable membrane (200).

2. The temperature and humidity sensing device according to claim 1, characterized in that: The shell (100) further comprises a plurality of positioning posts (120), wherein the positioning posts (120) are fixedly connected to one side of the main body plate (110) located in the accommodating cavity and surround the accommodating groove (111); the flow guide fixing member (300) further comprises a plurality of positioning holes (311) extending therethrough, wherein the number of the positioning holes (311) is the same as the number of the positioning posts (120), and each of the positioning posts (120) is connected to one of the positioning holes (311).

3. The temperature and humidity sensing device according to claim 2, characterized in that: The flow guide fixing member (300) comprises a fixing plate (310) and a first annular member (320), the vent hole (312) passes through the fixing plate (310), the positioning hole (311) passes through the fixing plate (310), the first annular member (320) is fixed to one side of the fixing plate (310), one end of the first annular member (320) away from the fixing plate (310) is pressed against the waterproof breathable membrane (200), the axis of the first annular member (320) coincides with the axis of the vent hole (312), and one side of the fixing plate (310) provided with the first annular member (320) is in contact with a side of the main plate (110) located in the accommodating cavity.

4. The temperature and humidity sensing device according to claim 3, characterized in that: The flow guide fixing member (300) also includes a second annular member (330), which is fixed to the other side of the fixing plate (310), the axis of the second annular member (330) coincides with the axis of the vent hole (312), and one end of the second annular member (330) away from the fixing plate (310) is pressed against the circuit board body (920).

5. The temperature and humidity sensing device according to claim 3, characterized in that: The inner diameter of the first annular member (320) is greater than the aperture of the vent hole (312).

6. The temperature and humidity sensing device according to claim 2, characterized in that: The length direction of the positioning column (120) is perpendicular to the plane where the main body plate (110) is located, and the length direction of the ventilation hole (312) is parallel to the length direction of the positioning hole (311).

7. The temperature and humidity sensing device according to claim 2, characterized in that: Two positioning posts (120) are provided, and the two positioning posts (120) are symmetrically arranged about the center of the accommodating groove (111).

8. The temperature and humidity sensing device according to claim 1, characterized in that: The waterproof breathable membrane (200) further comprises a waterproof breathable area (220) and a back glue area (210) surrounding the waterproof breathable area (220); the flow guide fixing member (300) is sandwiched between the back glue area (210) and the PCB (900); and the test space is connected to the through hole (112) via the waterproof breathable area (220).

9. The temperature and humidity sensing device according to claim 8, characterized in that: In a plane parallel to the waterproof breathable membrane (200), the projection of the waterproof breathable area (220) covers the projection of the vent hole (312), and the projection of the waterproof breathable area (220) covers the projection of the through hole (112).

10. The temperature and humidity sensing device according to any one of claims 1 to 9, characterized in that: The through hole (112) is opened at the center of the bottom of the accommodating groove (111).

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