TW201432203A - Constant temperature and humidity steam supplier by vacuum suction - Google Patents

Abstract

A constant temperature and humidity steam supplier by using vacuum suction comprising: a programmable constant temperature and humidity control box, a flow control unit and a negative pressure generation device. An inclined partition plate is disposed in the programmable constant temperature and humidity control box to have it separated into an upper and a lower space, and a heater is used at the lower space to heat the distilled water for steam generation. The steam is sucked to the upper space by a circulation fan and combined with the condensed water to return from the opening at the bottom of the inclined partition plate to the lower space for restarting circulation. A thermometer and a hygrometer are installed in the upper space to provide a detected value to a proportional-integral-derivative (PID) controller to adjust the heater via the setting of the temperature controller, thus maintaining the water vapor of the box in a constant temperature and humidity state. When in use, the vacuum generation device can be utilized to suck water vapor from the box for mixture with a standard gas in order to calibrate the analyzer.

Description

Constant temperature and humidity steam supply device using negative pressure pumping

The invention relates to a constant temperature and humidity vapor supply device using negative pressure extraction, in particular to extracting constant temperature and humidity steam and mixing it with a standard gas and sending it to an analyzer for use as a calibration.

Air pollution sampling, analysis and monitoring can understand the types and concentrations of pollutants in the air. It is the ear of the air quality management system. Through this work, engineers, scientists, decision makers and planners can understand the pollutants at specific times and places. The concentration and use of this information to make a correct judgment, develop a management strategy or conduct pollution source emission control to maintain air quality.

Air pollutant measurement usually involves two tasks: sampling and analysis. The so-called sampling is to collect samples of airborne pollutants at the site at that time. The analysis uses chemical or gravimetric methods to determine the concentration of pollutants. The sampling must be on site. The analysis is usually carried out in the laboratory, but it can also be analyzed on site.

As shown in Fig. 1, before the laboratory analysis, in order to prevent the sensing element of the analyzer from being passivated or contaminated, it is necessary to perform a correction process in advance, including using the flow controller 12 and the flow meter 13 to make the standard gas 10 and The zero-value standard gas 11 is mixed in proportion in the mixing tank 14, and is input to the analyzer 16 through the output manifold 15 to perform the operation of the parameter correction 17.

Different measurement objects have great differences in their surrounding environment (such as temperature, humidity, etc.) and contaminant concentrations, so the sampling and analysis methods are also different. Since the detection value of pollution has a great relationship with the temperature, humidity, and pressure of the detection environment, the detection value according to the normal detection method tends to deviate from the fact. In view of this, we need to be able to control the standard gas. The temperature and humidity of the body source can really improve the accuracy of the instrument calibration.

The currently available constant temperature and humidity chambers are mainly designed for testing high temperature, low temperature resistance and humidity resistance of electronic products. It is known from the design common sense that the design is different for different purposes, and small differences may damage the composition of standard gases. Therefore, it is not possible to directly apply the commercially available constant temperature and humidity chamber directly to the laboratory for heating and humidifying the standard gas and maintaining the constant temperature and humidity.

In view of the need to improve the accuracy of the calibration analyzer, the present invention provides a constant temperature and humidity vapor supply device using negative pressure extraction, and is provided with a programmable constant temperature and humidity control box, a flow control unit and a negative pressure generating device.

In the programmable constant temperature and humidity control box, a sloping partition plate is arranged to divide into an upper space and a lower space, and in the lower space, the steam is heated by the heater to generate steam, and the steam is pumped to the upper space by the circulation fan, and then condensed Moisture recirculates from the opening at the lower end of the inclined partition back to the lower space.

A thermometer and a hygrometer are provided inside the upper space to provide a detection value to a proportional-integral-derivative controller (PID). The heater is adjusted by the temperature controller to automatically maintain the water vapor in the tank at a constant temperature. Wet state.

In use, the analyzer can be calibrated by using a vacuum generating device to attract water vapor in the tank to mix with a standard gas.

2‧‧‧Constant temperature and humidity steam supply unit using negative pressure pumping

3‧‧‧Programmable constant temperature and humidity control box

5‧‧‧Negative pressure generating device

6‧‧‧ standard gas

7‧‧‧Analyzer

8‧‧‧First flow control unit

9‧‧‧3-way valve

10‧‧‧ standard gas

11‧‧‧zero standard gas

12‧‧‧Flow Controller

13‧‧‧ Flowmeter

14‧‧‧ mixing tank

15‧‧‧ Output manifold

16‧‧‧Analyzer

17‧‧‧Parameter correction

31‧‧‧Sloping partition

32‧‧‧Upper space

33‧‧‧Lower space

34‧‧‧Circular fan

35‧‧‧ openings

36‧‧‧heater

37‧‧‧Distilled water tank

41‧‧‧ thermometer

42‧‧‧Hygrometer

44‧‧‧ Temperature Controller

43‧‧‧Proportional-Integral-Derivative Controller (PID)

45‧‧‧Vacuum damage device

46‧‧‧Level switch

47‧‧‧Automatic water control valve

81‧‧‧First flow adjustment device

82‧‧‧First flowmeter

84‧‧‧directional valve

91‧‧‧Second flow adjustment device

92‧‧‧Second flowmeter

Fig. 1 is a flow chart for correcting the conventional contaminated gas analyzer.

Fig. 2 is a schematic view showing a constant temperature and humidity vapor supply device using negative pressure pumping in the present invention.

As shown in FIG. 2, a constant temperature and humidity vapor supply device 2 for vacuum pumping according to the present invention is provided with at least one programmable constant temperature and humidity control box 3, an inclined diaphragm 31, and a negative pressure generating device. Device 5, a first flow control unit 8.

The inclined partition plate 31 divides the programmable constant temperature and humidity control box 3 into an upper space 32 and a lower space 33, and is provided with a circulation fan 34 and an opening 35 at the lower end. Preferably, the circulation fan 34 is disposed at the upper end of the inclined partition 31 to maximize the path of the entire steam cycle, so that the quality of the steam is more uniform and stable.

A heater 36 is provided in the lower space 33 to heat a distillation water tank 37 to generate water vapor, and the water vapor in the lower space 33 is pumped to the upper space 32 by the circulation fan 34, and the water is circulated along with the water condensing opening 35. Returning to the lower space 33 to reheat or re-draw to the upper space 32. In order to avoid accidents of dry burning, a liquid level switch 46 and an automatic water supply control valve 47 may be provided in the lower space 33 to maintain the water level of the distillation water tank 37 over the heater 36.

A thermometer 41 and a hygrometer 42 are disposed inside the upper space 32 to provide a temperature value and a humidity value to a proportional-integral-derivative controller (PID) 43.

The proportional-integral-derivative controller (PID) 43 compares the setting of the temperature controller 44 with the temperature value and the humidity value to dynamically adjust the heat generation of the heater 36 so that the water vapor in the upper space 32 is maintained at a constant temperature. Wet state.

The negative pressure generating device 5 is versatile with the programmable constant temperature and humidity control box 3 to extract water vapor in the upper space 32 to mix with a standard gas 6 to correct an analyzer 7. The negative pressure generating device 5 can be implemented as an air pump. Preferably, a vacuum breaking device 45 is provided in the upper space 32 to maintain the pressure balance inside and outside the programmable constant temperature and humidity control box 3 to prevent pressure imbalance and to extract water vapor.

A first flow control unit 8 is configured to control the flow rate of water vapor extracted from the upper space 32, and communicate with the programmable constant temperature and humidity control box 3 through a pipeline, and at least a first flow regulating device 81 is connected to the first Flow meter 82 to regulate the flow rate when water vapor is withdrawn. The embodiment The first flow control unit 8 may further include a directional valve 84 for testing the water vapor to verify the quality of the water vapor.

Preferably, the first flow control unit 8 is connected between the programmable constant temperature and humidity control box 3 and the negative pressure generating device 5. In addition, the flow control unit may further include a three-way valve 9 for connecting a standard gas 6 with the extracted water vapor, and the negative pressure generating device 5 is sent to the analyzer 7 for correction. Preferably, the three-way valve 9 of the present embodiment can control the flow rate of the standard gas 6 through a second flow rate adjusting device 91 and a second flow meter 92.

In summary, the constant temperature and humidity vapor supply device using the negative pressure pumping of the present invention can indeed provide the constant temperature and humidity standard gas of the detecting instrument, and the programmable constant temperature and humidity control box separated by the upper and lower sides is used. - The integral-differential controller makes the temperature and humidity precise and simple, and has practical, novel and progressive patent requirements for familiar readers.

2‧‧‧Constant temperature and humidity steam supply unit using negative pressure pumping

3‧‧‧Programmable constant temperature and humidity control box

5‧‧‧Negative pressure generating device

6‧‧‧ standard gas

7‧‧‧Analyzer

8‧‧‧First flow control unit

9‧‧‧3-way valve

31‧‧‧Sloping partition

32‧‧‧Upper space

33‧‧‧Lower space

34‧‧‧Circular fan

35‧‧‧ openings

36‧‧‧heater

37‧‧‧Distilled water tank

41‧‧‧ thermometer

42‧‧‧Hygrometer

43‧‧‧Proportional-Integral-Derivative Controller (PID)

44‧‧‧ Temperature Controller

45‧‧‧Vacuum damage device

46‧‧‧Level switch

47‧‧‧Automatic water control valve

81‧‧‧First flow adjustment device

82‧‧‧First flowmeter

84‧‧‧directional valve

91‧‧‧Second flow adjustment device

92‧‧‧Second flowmeter

Claims (10)

The utility model relates to a constant temperature and constant humidity steam supply device which utilizes negative pressure pumping, and has at least: a programmable constant temperature and humidity control box; an inclined partition plate, which divides the programmable constant temperature and humidity control box into an upper space and a space The inclined partition plate is provided with a circulation fan, and an opening is provided at the lower end, and a heater is arranged in the lower space to heat a distillation water tank to generate water vapor, and the steam fan in the lower space is pumped by the circulation fan Up to the upper space, together with the moisture condensed by the water vapor, the opening is returned to the lower space to be reheated or re-drawn into the upper space; wherein the upper space is provided with a thermometer and a hygrometer. Providing a temperature value and a humidity value to a proportional-integral-derivative controller (PID); the proportional-integral-derivative controller (PID) is compared with the setting of the temperature controller and the temperature value and the humidity value, Dynamically adjusting the heat quantity of the heater to maintain the water vapor in the upper space in a constant temperature and humidity state; and a negative pressure generating device common to the programmable constant temperature and humidity control box to extract the upper space Steam, so that a corrected and analyzer with a mixed standard gas; a flow control unit for controlling the flow rate of the steam temperature and humidity conditions. The constant temperature and humidity vapor supply apparatus using vacuum suction according to claim 1, wherein the circulation fan is disposed at an upper end of the inclined partition. The constant temperature and humidity vapor supply device using vacuum suction according to the first aspect of the invention, wherein the upper space is provided with a vacuum breaking device for maintaining pressure balance inside and outside the programmable constant temperature and humidity control box. The constant temperature and humidity vapor supply device using vacuum suction according to claim 1, wherein the lower space is provided with a liquid level switch and an automatic water supply control valve to maintain the water level of the distillation water tank. A constant temperature and humidity vapor supply device using negative pressure extraction as described in claim 1 of the patent application scope, Wherein the negative pressure generating device is an air pump. The constant temperature and humidity vapor supply device using vacuum suction according to claim 1, wherein the flow control unit is connected to the programmable constant temperature and humidity control box through a pipeline, and includes a first flow adjustment. The device is connected to a first flow meter. The constant temperature and humidity vapor supply device using vacuum suction according to claim 6, wherein the flow control unit is connected between the programmable constant temperature and humidity control box and the negative pressure generating device. The constant temperature and humidity vapor supply device using vacuum suction according to claim 7, wherein the flow control unit further comprises a three-way valve for accessing a standard gas and the constant temperature and humidity water. The steam is mixed and sent by the negative pressure generating device to the analyzer for calibration. The constant temperature and humidity vapor supply device using vacuum suction according to claim 7, wherein the flow control unit further comprises a directional valve for testing discharge to check the water vapor quality of the constant temperature and humidity state. . The constant temperature and humidity vapor supply device using vacuum suction according to claim 8, wherein the three-way valve is introduced into the standard gas through a second flow rate adjusting device and a second flow meter.