CN211785453U

CN211785453U - Humidity sensor applied to laboratory environment detection

Info

Publication number: CN211785453U
Application number: CN202020454075.8U
Authority: CN
Inventors: 林伟敏; 富雅琼; 郑安迪
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-10-27
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a be applied to humidity transducer that laboratory environment detected, include: the PCB comprises a lower shell, a PCB circuit board and an upper shell; a first groove, a second groove and a partition plate arranged between the first groove and the second groove are arranged in the lower shell, and a limiting groove is formed in the partition plate; the PCB circuit board comprises a first circuit board, a second circuit board and a bridge board for connecting the first circuit board and the second circuit board, wherein the first circuit board is provided with a sensor circuit module, the second circuit board is provided with a communication circuit module, and the width of the bridge board is matched with the limiting groove and is smaller than that of the first circuit board and the second circuit board; during installation, the first circuit board is arranged in the first groove, the second circuit board is arranged in the second groove, and the bridge plate is arranged in the limiting groove. The sensor circuit module is effectively isolated through the partition plate, the influence of heating of the communication circuit template communication circuit on the humidity sensor is avoided, and the detection precision is improved.

Description

Humidity sensor applied to laboratory environment detection

Technical Field

The utility model relates to a laboratory environment detects technical field, concretely relates to be applied to humidity transducer that laboratory environment detected.

Background

Humidity is an index representing the degree of humidity in the air, which reflects the amount of water vapor in the air. Humidity is divided into absolute humidity and relative humidity, and a laboratory generally uses the relative humidity to represent the humidity degree in air, the relative humidity reflects the degree that the absolute humidity is close to saturated absolute humidity, and the higher the relative humidity is, the more humid the air is, otherwise, the drier the air is. The experiment result is greatly influenced by overhigh or overlow environmental humidity of the laboratory, so that the humidity of the laboratory can be accurately detected and effectively controlled.

It is well known that relative humidity is a function of temperature, which severely affects the relative humidity within a given space. Every 0.1 ℃ change in temperature will produce a humidity change of 0.5% RH. At present, the environment of a laboratory is generally a constant temperature environment, the detection error of the humidity sensor is slightly influenced by the external constant temperature environment, but the influence of the heating of the internal communication circuit of the humidity sensor on the measurement precision is very obvious. At present, a humidity sensor usually adopts fixed value compensation or field calibration compensation value after the installation of a product to reduce the influence of self heating on a measurement result. If a fixed value compensation mode is used, the test value is normal when the heating and the heat dissipation of the communication circuit reach balance, but if the humidity sensor is just powered on and works, the heat generated by the communication circuit is not transferred to the humidity sensor, and the heating and the heat dissipation of the communication circuit do not reach balance, the measured value of the humidity sensor generates a large error; if the compensation value is modified on site, a professional is needed, and labor cost and workload are greatly increased.

Therefore, it is necessary to provide a humidity sensor applied to laboratory environment detection, so as to reduce the influence of the temperature rise of the humidity sensor on the measurement result and improve the precision of the laboratory humidity detection.

Disclosure of Invention

To the inside temperature rise of humidity transducer influence laboratory humidity and detect the problem that the precision descends, the utility model provides a be applied to humidity transducer that laboratory environment detected can reduce the influence of internal communication circuit to humidity transducer, and then improves the precision that laboratory humidity detected.

The utility model relates to a be applied to humidity transducer that laboratory environment detected, its characterized in that includes: the PCB comprises a lower shell, a PCB circuit board and an upper shell;

a first groove, a second groove and a partition plate arranged between the first groove and the second groove are formed in the lower shell, and a limiting groove is formed in the partition plate; the PCB circuit board comprises a first circuit board, a second circuit board and a bridge board for connecting the first circuit board and the second circuit board, wherein a sensor circuit module is arranged on the first circuit board, a communication circuit module is arranged on the second circuit board, and the width of the bridge board is matched with the limiting groove and is smaller than the width of the first circuit board and the width of the second circuit board;

the upper shell has an internal structure symmetrical to the lower shell;

during installation, the first circuit board is arranged in the first groove, the second circuit board is arranged in the second groove, and the bridge plate is arranged in the limiting groove.

Preferably, the second groove comprises a groove with two-stage groove width, and is used for matching PCB circuit boards with different sizes.

Preferably, a plurality of ventilation grooves are further formed in positions of the lower shell and the upper shell corresponding to the first groove.

Preferably, a convex column is arranged in the second groove, an internal thread hole is formed in the convex column, a screw hole corresponding to the convex column is formed in the second circuit board, and the second circuit board is fixed on the convex column through a screw.

Preferably, a digital humidity sensor is arranged in the sensor circuit module, and the digital humidity sensor is arranged at the end part of the first circuit board far away from the second circuit board.

Preferably, the upper shell and the lower shell are both provided with a plurality of mounting holes, and the upper shell and the lower shell are fixed together through screws.

The utility model has the advantages that:

1. the utility model discloses an inside baffle separates humidity transducer and communication circuit in two regions, and humidity transducer's position keeps away from communication circuit's position, can effectually avoid communication circuit's self to generate heat the influence to humidity transducer, and then has improved the precision that laboratory humidity detected.

2. The utility model discloses a set up the ventilation groove in humidity transducer's corresponding position, let humidity transducer feel the contact that moisture in wet component and the air can be abundant, and then improve humidity transducer's detection precision.

Drawings

FIG. 1 is a schematic overview of a humidity sensor;

FIG. 2 is a schematic view of the internal structure of the lower case;

FIG. 3 is a schematic diagram of a PCB structure;

in the figure: 1: an upper housing; 2: a PCB circuit board; 3: a lower housing; 31: a first groove; 32: a partition plate; 33: a limiting groove; 34: a second groove; 35: a convex column; 36: an inner threaded hole; 37: a ventilation slot; 21: a first circuit board; 22: a bridge plate; 23: a second circuit board; 24: a screw hole; 25: a communication circuit module; 26: a sensor circuit module;

Detailed Description

The present invention will be described in detail with reference to the specific embodiments shown in the drawings, but these embodiments do not limit the present invention, and the structural changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present invention.

As shown in fig. 1, the humidity sensor applied to laboratory environment detection of the present invention comprises a lower casing 3, a PCB circuit board 2, and an upper casing 1; the upper case 1 has an internal structure symmetrical to the lower case 3.

As shown in fig. 2, a first groove 31, a second groove 34 and a partition plate 32 arranged between the first groove 31 and the second groove 34 are arranged in the lower shell 3, and a limit groove 33 is arranged on the partition plate 32; preferably, the second recess 34 comprises a two-step recess width for accommodating different sizes of PCB boards 2.

As shown in fig. 3, the PCB 2 includes a first circuit board 21, a second circuit board 23, and a bridge 22 connecting the first circuit board 21 and the second circuit board 23, wherein the width of the bridge 22 matches with the limiting groove 33 and is smaller than the first circuit board 21 and the second circuit board 23; the first circuit board 21 is provided with a sensor circuit module 26, and the second circuit board 23 is provided with a communication circuit module 25; preferably, a digital humidity sensor is disposed in the sensor circuit module 26, and the digital humidity sensor is disposed at an end of the first circuit board 21 away from the second circuit board 23.

In order to make the PCB 2 more stably installed in the lower housing 3, there is a preferred scheme that two protruding columns 35 are arranged in the second groove 34, and an internal threaded hole 36 is arranged on the two protruding columns 35 for matching with the threaded hole 24 of the second circuit board 23; during the installation, install the bridge 22 of PCB circuit board 2 to the spacing groove 33 of casing 3 down, the internal thread hole 36 of second circuit board 23 is corresponding with screw 24, is connected together PCB circuit board 2 and casing 3 down through the screw, and the effectual PCB circuit board 2 of having prevented has improved the steadiness of PCB circuit board 2 installation to the drunkenness in casing 3 down.

The upper shell 1 is mounted on the lower shell 3, and according to a preferred scheme, the upper shell 1 and the lower shell 3 are both provided with a plurality of mounting holes, and the upper shell 1 and the lower shell 3 are fixed together through the combination of screws and nuts.

In order to increase the air circulation and make the humidity sensor sensing the humidity component and the humidity in the air fully contact, there is a preferred scheme that a plurality of ventilation grooves 37 are further provided at the positions of the lower housing 3 and the upper housing 1 corresponding to the first groove 31, so that the sensor circuit module 26 installed in the first groove 31 fully contacts with the detection environment, and further the detection precision of the humidity sensor is improved.

In a specific embodiment, the first groove 31, the second groove 34 and the limiting groove 33 in the lower housing 3 have a semicircular groove bottom, and form a complete circular inner cavity in combination with the upper housing 1.

The width of the first groove 31 is the same as the width and the groove depth of the second groove 34; the groove width of the limiting groove 33 is smaller than the width of the first groove 31, the groove depth of the limiting groove 33 is smaller than the groove depth of the first groove 31, and the groove width of the limiting groove 33 is matched with the width of the bridge plate 22; the sensor circuit module 26 positioned in the first groove 31 and the communication circuit module 25 positioned in the second groove are separated into two areas by the partition plate 32 between the first groove 31 and the second groove 34, the influence of the heating of the communication circuit in the second groove 34 on the sensor circuit module 26 in the first groove 31 is effectively avoided, and the detection precision of the humidity sensor is improved.

Baffles are arranged at the end parts of the first groove 31 and the second groove 34, a wire passing groove is arranged on the baffle corresponding to the second groove 34, and the PCB 2 and an external connecting wire are led out through the wire passing groove;

when the circuit board is installed, the first circuit board 21 is arranged in the first groove 31, the second circuit board 23 is arranged in the second groove 34, and the bridge board 22 is arranged in the limiting groove 33; the sensor circuit module 26 is effectively isolated by the first groove 31 and the partition plate 32, and the influence of the heat generated by the communication circuit of the communication circuit module 25 at the other end of the PCB 2 on the sensor circuit module 26 is effectively avoided.

The utility model discloses first recess 31 and baffle 32 of establishing in casing 3 keep apart the sensor circuit part 26 of first circuit board 21 down, and effectual second recess 34 interior communication circuit module 25 communication circuit of having avoided generates heat to sensor module 26's influence, has improved the precision that laboratory humidity detected.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A humidity sensor for use in laboratory environment testing, comprising: the PCB comprises a lower shell, a PCB circuit board and an upper shell;

the upper shell has an internal structure symmetrical to the lower shell;

2. The humidity sensor applied to laboratory environment detection as claimed in claim 1, wherein: the second groove comprises two-stage groove width grooves used for matching with PCB circuit boards of different sizes.

3. The humidity sensor applied to laboratory environment detection as claimed in claim 1, wherein: and a plurality of ventilation grooves are formed in the positions of the lower shell and the upper shell corresponding to the first groove.

4. The humidity sensor applied to laboratory environment detection as claimed in claim 1, wherein: the second circuit board is provided with a screw hole corresponding to the convex column, and the second circuit board is fixed on the convex column through a screw.

5. The humidity sensor applied to laboratory environment detection as claimed in claim 1, wherein: the sensor circuit module is internally provided with a digital humidity sensor which is arranged at the end part of the first circuit board far away from the second circuit board.

6. The humidity sensor applied to laboratory environment detection as claimed in claim 1, wherein: the upper shell and the lower shell are both provided with a plurality of mounting holes, and the upper shell and the lower shell are fixed together through screws.