CN212780692U

CN212780692U - Portable formaldehyde measuring device

Info

Publication number: CN212780692U
Application number: CN202021136159.3U
Authority: CN
Inventors: 林传军; 沈栎峰
Original assignee: Jiangsu Dalishi Investment Co ltd
Current assignee: Jiangsu Dalishi Investment Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-03-23
Anticipated expiration: 2030-06-18

Abstract

The utility model belongs to the technical field of the empty gas detection surveys, more specifically says, relates to a portable formaldehyde measuring device. The device comprises a shell, a PCB (printed circuit board), an operation button, a display screen, a formaldehyde sensor, a pressure sensor, a gas collection chamber, a power supply and a pressurizing assembly; the PCB is arranged in the shell, the control button, the display screen, the formaldehyde sensor, the pressure sensor and the power supply are electrically connected with the PCB, and the control button and the display screen are exposed out of the shell; the gas collection chamber is arranged in the shell, and the formaldehyde sensor and the pressure sensor are arranged in the gas collection chamber and are communicated with the inside of the gas collection chamber; the pressurizing assembly is electrically connected with the PCB, and the pressurizing assembly pumps air outside the shell into the air collecting chamber. The utility model provides a portable formaldehyde measuring device, the design is succinct pleasing to the eye, and inner structure is compact, and measurement accuracy is high, and the measurement lower limit is low, and measurement stability is good, and in addition, this formaldehyde measuring device still has and prevents falling functions such as dustproof.

Description

Portable formaldehyde measuring device

Technical Field

The utility model belongs to the technical field of the empty gas detection surveys, more specifically says, relates to a portable formaldehyde measuring device.

Background

Formaldehyde is one of the pollutants which are difficult to avoid in the modern home decoration process, and can cause symptoms of anorexia, insomnia, dreaminess, hypomnesis and the like when living indoors with excessive formaldehyde for a long time. Particularly for pregnant women and children, formaldehyde is more obviously harmful, and the growth and development of the children are possibly malformed. In addition, formaldehyde also has certain carcinogenic effect. Therefore, it is very necessary to perform the detection of formaldehyde content after finishing interior decoration.

The basic principle of the existing formaldehyde measuring device is that an electrochemical formaldehyde sensor is used for detecting formaldehyde in air, concentration information of formaldehyde molecules in the air is converted into corresponding electric signals, and then the corresponding electric signals are transmitted to a circuit board, and concentration data of the formaldehyde are displayed by a display after the circuit board is processed and calculated, for example, a formaldehyde detector disclosed by Chinese utility model patent CN 205091312U. The formaldehyde measuring device has a simple structure and is widely applied at present. However, in practical measurement application, the concentration of formaldehyde in the environment is not very high in most cases, and is close to or even far lower than the standard 0.08mg/m required by the civil building indoor environmental pollution control and control code³. Under the condition, the method is limited by the resolution of the formaldehyde sensor, and the measured air has certain fluidity and instability, so that the measured formaldehyde concentration data is easy to fluctuate greatly, the repeatability is poor, and the user experience and the product confidence are seriously influenced.

In addition, the existing formaldehyde measuring device also has the problems of easy dust accumulation, poor anti-falling performance and the like in the aspect of long-term use in structural design.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides a portable formaldehyde measuring device to overcome the above-mentioned not enough that exists among the prior art.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a portable formaldehyde measuring device comprises a shell, a PCB (printed circuit board), an operation button, a display screen, a formaldehyde sensor, a pressure sensor, a gas collection chamber, a power supply and a pressurizing assembly; the PCB is arranged in the shell, the control button, the display screen, the formaldehyde sensor, the pressure sensor and the power supply are electrically connected with the PCB, and the control button and the display screen are exposed out of the shell; the gas collection chamber is arranged in the shell, and the formaldehyde sensor and the pressure sensor are arranged in the gas collection chamber and are communicated with the inside of the gas collection chamber; the pressurizing assembly is electrically connected with the PCB, and the pressurizing assembly pumps air outside the shell into the air collecting chamber.

The utility model discloses the during operation, pressure boost subassembly will be external wait to detect gaseous pressurization pump sending to the gas collection indoor, reach the settlement pressure of constant pressure valve after, pressure boost subassembly continues to work and stops after a period, makes the indoor gas of gas collection obtain fully to be in the stable state after the replacement, then the concentration that PCB circuit board measured with formaldehyde sensor divides the pressure that pressure sensor measured, obtains actual formaldehyde concentration after the calibration calculation, shows concentration value by the display screen at last. Among them, the set pressure is preferably 3 to 10 atm. When the device is used for measurement, although the intrinsic measurement accuracy of the formaldehyde sensor is not changed, the actual detection accuracy is improved in proportion to the increase of the pressure because the concentration of the pressurized formaldehyde is increased in proportion to the pressure. Meanwhile, the gas collection chamber is a closed chamber, the pressure of the internal gas is increased, the total amount of the gas is increased, and the stability of the internal gas is good, so that the measurement stability is good. In addition, the lower measurement limit is further expanded by the pressure increase.

Furthermore, in the portable formaldehyde measuring device, the pressurizing assembly comprises a pressurizing air pump, a one-way valve, a constant pressure valve, an air inlet and an air outlet; the air inlet and the air outlet are both communicated with the outside of the shell; the air inlet end of the booster air pump is communicated with the air inlet; a one-way valve is arranged between the exhaust end of the booster air pump and the gas collection chamber; a constant pressure valve is arranged between the gas collection chamber and the exhaust port; the booster pump is electrically connected with the PCB circuit board. Under the control of the PCB, the pressurization air pump presses the outside air into the air collection chamber, and the constant pressure valve is matched with the control pressure.

Furthermore, in the portable formaldehyde measuring device, the surface of the air inlet exposed out of the shell is marked as a first exposed surface, and the first exposed surface is provided with a group of first air inlets; the surface of the exhaust port exposed out of the shell is marked as a second exposed surface, and a group of first exhaust holes are formed in the second exposed surface. The first air inlet hole and the first air outlet hole can enable air to circulate, and meanwhile sundries can be prevented from entering the device.

Furthermore, the first exposed surface of the portable formaldehyde measuring device is circular, the inner side of the first exposed surface can be rotatably provided with a first baffle, and the first baffle is provided with a group of second air inlets corresponding to the first air inlets in position and size; the first baffle plate is rotated to enable the positions of the first air inlet hole and the second air inlet hole to be staggered or overlapped. When the device is not used for a long time, the first baffle plate can be manually rotated to enable the positions of the first air inlet hole and the second air inlet hole to be staggered, so that dust is prevented from entering; when the air conditioner is used, the first baffle plate can be manually rotated to enable the positions of the first air inlet hole and the second air inlet hole to be overlapped, so that air can circulate.

Further, foretell portable formaldehyde measuring device, in the air inlet, pressure boost air pump inlet end department is equipped with the particulate matter filter screen, and the dust in the filtering gas prevents that the dust from getting into the indoor influence measurement accuracy of gas collection.

Furthermore, in the portable formaldehyde measuring device, the second exposed surface is circular, a second baffle plate can be rotatably arranged on the inner side of the second exposed surface, and a group of second exhaust holes corresponding to the first exhaust holes in position and size are formed in the second baffle plate; the first exhaust hole and the second exhaust hole can be staggered or superposed by rotating the second baffle. When the device is not used for a long time, the second baffle plate can be manually rotated to enable the positions of the first exhaust hole and the second exhaust hole to be staggered, so that dust is prevented from entering; when the air-conditioner is used, the second baffle plate can be manually rotated to enable the positions of the first exhaust hole and the second exhaust hole to be overlapped, so that air is circulated.

Preferably, in the above portable formaldehyde measuring device, the casing is rectangular and rounded.

Furthermore, according to the portable formaldehyde measuring device, the edge of the shell is also provided with the raised protection ring, and the protection ring is made of elastic materials. When the device falls down accidentally, the guard ring can play a certain buffering role.

Furthermore, the bottom of the shell of the portable formaldehyde measuring device is also provided with a group of foot pads.

Preferably, in the portable formaldehyde measuring device, the operating button is located at the top of the casing; the display screen, the air inlet and the air outlet are positioned on the side surface of the shell.

Has the advantages that: compared with the prior art, the utility model provides a portable formaldehyde measuring device, the design is succinct pleasing to the eye, and inner structure is compact, and measurement accuracy is high, and it is low to measure the lower limit, and measurement stability is good, and in addition, this formaldehyde measuring device still has and prevents falling functions such as dustproof.

Drawings

FIGS. 1 and 2 are schematic perspective views of embodiment 1;

fig. 3 is a schematic view of the internal structure of embodiments 1 to 3 of the present invention;

FIGS. 4 and 5 are schematic perspective views of example 2;

FIGS. 6 and 7 are schematic perspective views of example 3;

FIG. 8 is a sectional view of an air intake port in embodiment 3;

FIG. 9 is a sectional view of the exhaust port in embodiment 3;

FIG. 10 is a schematic front view of a first exposed surface in embodiment 3;

FIG. 11 is a schematic front view of a first baffle plate in example 3;

FIG. 12 is a schematic front view of a second exposed surface in embodiment 3;

fig. 13 is a schematic front view of a second baffle plate in example 3.

In the figure, the casing 1, the PCB 2, the control button 3, the display screen 4, the formaldehyde sensor 5, the pressure sensor 6, the gas collection chamber 7, the power supply 8, the pressure boost subassembly 9, the pressure boost air pump 91, the check valve 92, the constant pressure valve 93, the air inlet 94, the gas vent 95, first exposed surface 941, first inlet port 942, first baffle 943, second inlet port 944, particulate matter filter screen 96, second exposed surface 951, first exhaust port 952, second baffle 953, second exhaust port 954, guard ring 11, the foot pad 12.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

A portable formaldehyde measuring device is shown in figures 1 to 3 and comprises a shell 1, a PCB circuit board 2, an operation button 3, a display screen 4, a formaldehyde sensor 5, a pressure sensor 6, a gas collection chamber 7, a power supply 8 and a pressurizing assembly 9; the PCB circuit board 2 is arranged in the shell 1, the control button 3, the display screen 4, the formaldehyde sensor 5, the pressure sensor 6 and the power supply 8 are electrically connected with the PCB circuit board 2, wherein the control button 3 and the display screen 4 are exposed out of the shell 1; the gas collection chamber 7 is arranged in the shell 1, and the formaldehyde sensor 5 and the pressure sensor 6 are arranged in the gas collection chamber 7 and are communicated with the inside of the gas collection chamber 7; the pressurizing assembly 9 is electrically connected with the PCB 2, and the pressurizing assembly 9 pressurizes and pumps air outside the shell 1 into the air collecting chamber 7.

In this embodiment, the pressurizing assembly 9 includes a pressurizing air pump 91, a check valve 92, a constant pressure valve 93, an air inlet 94, and an air outlet 95; the air inlet 94 and the air outlet 95 are both communicated with the outside of the housing 1; the air inlet end of the booster air pump 91 is communicated with the air inlet 94; a check valve 92 is arranged between the exhaust end of the booster air pump 91 and the gas collection chamber 7; a constant pressure valve 93 is arranged between the gas collection chamber 7 and the exhaust port 95; the booster pump 91 is electrically connected to the PCB circuit board 2.

Example 2

A portable formaldehyde measuring device is shown in figures 3 to 5 and comprises a shell 1, a PCB circuit board 2, an operation button 3, a display screen 4, a formaldehyde sensor 5, a pressure sensor 6, a gas collection chamber 7, a power supply 8 and a pressurizing assembly 9; the PCB circuit board 2 is arranged in the shell 1, the control button 3, the display screen 4, the formaldehyde sensor 5, the pressure sensor 6 and the power supply 8 are electrically connected with the PCB circuit board 2, wherein the control button 3 and the display screen 4 are exposed out of the shell 1; the gas collection chamber 7 is arranged in the shell 1, and the formaldehyde sensor 5 and the pressure sensor 6 are arranged in the gas collection chamber 7 and are communicated with the inside of the gas collection chamber 7; the pressurizing assembly 9 is electrically connected with the PCB 2, and the pressurizing assembly 9 pressurizes and pumps air outside the shell 1 into the air collecting chamber 7.

In this embodiment, the casing 1 is rectangular and rounded.

In this embodiment, the edge of the casing 1 is further provided with a raised protection ring 11, and the protection ring is made of an elastic material.

In this embodiment, the manipulation button 3 is located at the top of the housing 1; the display screen 4, the air inlet 94 and the air outlet 95 are located on the side of the housing.

Example 3

A portable formaldehyde measuring device, as shown in fig. 3 and 6 to 13, comprising a housing 1, a PCB 2, an operation button 3, a display screen 4, a formaldehyde sensor 5, a pressure sensor 6, a gas collection chamber 7, a power supply 8, and a pressurizing assembly 9; the PCB circuit board 2 is arranged in the shell 1, the control button 3, the display screen 4, the formaldehyde sensor 5, the pressure sensor 6 and the power supply 8 are electrically connected with the PCB circuit board 2, wherein the control button 3 and the display screen 4 are exposed out of the shell 1; the gas collection chamber 7 is arranged in the shell 1, and the formaldehyde sensor 5 and the pressure sensor 6 are arranged in the gas collection chamber 7 and are communicated with the inside of the gas collection chamber 7; the pressurizing assembly 9 is electrically connected with the PCB 2, and the pressurizing assembly 9 pressurizes and pumps air outside the shell 1 into the air collecting chamber 7.

In this embodiment, a surface of the air inlet 94 exposed out of the housing 1 is denoted as a first exposed surface 941, and a set of first air inlet holes 942 are formed on the first exposed surface 941; the surface of the air outlet 95 exposed out of the housing 1 is denoted as a second exposed surface 951, and a group of first air outlet 952 is formed on the second exposed surface 951.

In this embodiment, the first exposed surface 941 is circular, a first baffle 943 is rotatably disposed inside the first exposed surface 941, and a set of second air inlets 944 corresponding to the first air inlets 942 in position and size is disposed on the first baffle 943; the positions of the first intake holes 942 and the second intake holes 944 can be staggered or overlapped by rotating the first baffle 943.

In this embodiment, a particulate filter 96 is disposed in the air inlet 94 at the air inlet end of the boost pump 91.

In this embodiment, the second exposed surface 951 is circular, a second baffle 953 is further rotatably disposed inside the second exposed surface 951, and a set of second exhaust holes 954 corresponding to the positions and sizes of the first exhaust holes 952 are disposed on the second baffle 953; the second shutter 953 is rotated to shift or align the positions of the first exhaust holes 952 and the second exhaust holes 954.

In this embodiment, a set of feet 12 is further disposed at the bottom of the housing 1.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a portable formaldehyde measuring device which characterized in that: the formaldehyde-free formaldehyde gas collection device comprises a shell (1), a PCB (printed circuit board) circuit board (2), an operation button (3), a display screen (4), a formaldehyde sensor (5), a pressure sensor (6), a gas collection chamber (7), a power supply (8) and a pressurizing assembly (9); the PCB (2) is arranged in the shell (1), the control button (3), the display screen (4), the formaldehyde sensor (5), the pressure sensor (6) and the power supply (8) are electrically connected with the PCB (2), and the control button (3) and the display screen (4) are exposed out of the shell (1); the gas collection chamber (7) is arranged in the shell (1), and the formaldehyde sensor (5) and the pressure sensor (6) are arranged in the gas collection chamber (7) and are communicated with the inside of the gas collection chamber (7); the pressurizing assembly (9) is electrically connected with the PCB (2), and the pressurizing assembly (9) pumps air outside the shell (1) into the air collection chamber (7).

2. The portable formaldehyde measuring device of claim 1, wherein: the pressurizing assembly (9) comprises a pressurizing air pump (91), a one-way valve (92), a constant pressure valve (93), an air inlet (94) and an air outlet (95); the air inlet (94) and the air outlet (95) are both communicated with the outside of the shell (1); the air inlet end of the booster air pump (91) is communicated with the air inlet (94); the one-way valve (92) is arranged between the exhaust end of the booster air pump (91) and the air collection chamber (7); the constant pressure valve (93) is arranged between the gas collection chamber (7) and the exhaust port (95); the booster pump (91) is electrically connected with the PCB circuit board (2).

3. The portable formaldehyde measuring device of claim 2, wherein: the surface of the air inlet (94) exposed out of the shell (1) is marked as a first exposed surface (941), and a group of first air inlet holes (942) are formed in the first exposed surface (941); the face that gas vent (95) are exposed casing (1) is marked as second exposed face (951), seted up a set of first exhaust hole (952) on second exposed face (951).

4. The portable formaldehyde measuring device of claim 3, wherein: the first exposed surface (941) is circular, a first baffle (943) can be further arranged on the inner side of the first exposed surface (941) in a rotating mode, and a group of second air inlet holes (944) corresponding to the first air inlet holes (942) in position and size are formed in the first baffle (943); the positions of the first air inlet hole (942) and the second air inlet hole (944) can be staggered or overlapped by rotating the first baffle (943).

5. The portable formaldehyde measuring device of claim 4, wherein: and a particulate matter filter screen (96) is arranged at the air inlet end of the pressurization air pump (91) in the air inlet (94).

6. The portable formaldehyde measuring device of claim 3, wherein: the second exposed surface (951) is circular, a second baffle (953) can be further rotatably arranged on the inner side of the second exposed surface (951), and a group of second exhaust holes (954) corresponding to the first exhaust holes (952) in position and size are formed in the second baffle (953); the second exhaust hole (954) of the first exhaust hole (952) may be shifted or overlapped by rotating the second shutter (953).

7. The portable formaldehyde measuring device of claim 2, wherein: the shell (1) is integrally rectangular and is chamfered with round corners.

8. The portable formaldehyde measuring device of claim 7, wherein: the edge of the shell (1) is also provided with a raised protection ring (11), and the protection ring is made of elastic materials.

9. The portable formaldehyde measuring device of claim 7, wherein: the bottom of the shell (1) is also provided with a group of foot pads (12).

10. The portable formaldehyde measuring device of claim 7, wherein: the control button (3) is positioned at the top of the shell (1); the display screen (4), the air inlet (94) and the air outlet (95) are located on the side face of the shell.