CN2291660Y

CN2291660Y - Temp.-regulating saturated salt humidity generator

Info

Publication number: CN2291660Y
Application number: CN 96203358
Authority: CN
Inventors: 陈守文
Original assignee: NO 49 INST MINISTRY OF ELECTRONICS INDUSTRY
Current assignee: NO 49 INST MINISTRY OF ELECTRONICS INDUSTRY
Priority date: 1996-09-25
Filing date: 1996-09-25
Publication date: 1998-09-16
Anticipated expiration: 2006-09-25

Abstract

The utility model discloses a temperature-regulating saturated salt humidity generator, belonging to the humidity metering apparatus. Changeable drawer type salt boxes and a common workroom are arranged in a thermostatic bath, and the inner parts of the salt boxes respectively contain different saturated solutions of salt. The utility model adopts PID control and self setting technique to temperature, the temperature is regulated quickly, and the accuracy of the temperature reaches within 0.2 DEG C. Under any constant temperature condition from 5 DEG C to 50 DEG C, a plurality of humidity fixed points are generated, and the humidity range is from 12 % RH to 97 % RH. The utility model can be used as a standard humidity source to detect the humidity properties of humid sensitive elements and a humidity transducer. The utility model has the advantages of compact structure, small size, less power consumption, low cost and convenient use and maintenance.

Description

The saturated salt formula humidity generator of scalable temperature

The utility model relates to a kind of psychrometry utensil, particularly a kind of saturated salt humidity generating means.

All adopt saturated salt as humidity standard both at home and abroad, as the last word of Finland, portable saturated salt humidity calibration device is that two adjacent containers are one, is respectively charged into two kinds of saturated salt solutions, produces two relative humidity points.It singly is not that humidity point is few, at room temperature surveys several humidity sensors but also be limited to, not many humidity-sensitive elements of energy measurement.Owing to self can not regulate its temperature, also just can not be created in the standard humidity under the different temperatures, therefore, the temperature coefficient of energy measurement humidity-sensitive element not.

Domestic people generally adopt saturated saltcellar as the humidity generating means, indoor different saturated salt solutions are respectively charged in each wide-necked bottle.During use, fail to realize strictness control, cause the fluctuation of environment temperature, cause very mistake of humidity its environment temperature.Because it is regulated the temperature difficulty, not only the wetting balance time long, inefficiency, and, also can't measure the temperature coefficient of humidity-sensitive element.

The purpose of this utility model provide a kind of in 5～50 ℃ of temperature ranges continuously adjustable saturated salt formula humidity generator, it can be that 12～97%RH produces standard relative humidity at humidity range, can be used as the standard humidity source that humid test is used.

The purpose of this utility model is achieved in that and is provided with public operating room and replaceable salt box in the device, and this salt box places in each self-packing box cover, and the salt box is respectively charged into the saturated aqueous solution of different salt, and they all are in the calibration cell of same temperature.The operating room seals, in gas blender is arranged.

Replaceable salt box is a drawer type salt box, and the Packed thermal insulation in the outer end of box clogs the outlet in the box cover outside, can be respectively charged into Licl, Mgcl in the box ₂, NaBr, Nacl, Kcl, KNO ₃The saturated aqueous solution of 6 kinds of salt.

It is enough big that the calibration cell volume is wanted in generator, is full of water in it, and is provided with well heater and two liquid stirrers; Calibration cell outer wall both sides are covered with semiconductor cooler, remove this, and outer wall is surrounded by tight heat-insulation layer.Temperature controlling in the calibration cell is adopted PID control and automatic-adjusting technique, realize that it is quick, accurately regulate.

The motor of the gas blender of using in the operating room is fixed on the shelf bracket, be fixed on covering of calibration cell by three stud bolts that are installed with stage clip, the little axle of this stirrer and internal axle sleeve are for movingly, for containing the oil groove of lubricating oil, the outer shaft of puddler and insulation, pad all adopt thermal insulation material among the internal axle sleeve.

The utility model is owing to adopt replaceable drawer type salt box and public operating room, realized in same device, utilize saturated salt can set a plurality of humidity points, the PID that is finished by temperature controller regulates and adjusts certainly, make adjustment fast, accurately, reliably, take above various measure on the calibration cell immanent structure, the temperature accuracy of system reaches in 0.2 ℃ in addition.Under arbitrary temperature in 5～50 ℃ temperature range, by changing the salt box, can obtain each rh value under institute's corresponding temperature, the uncertainty of its relative humidity can reach ± 3%RH.Adopt that semiconductor cooler, advantage are that volume is little, noiselessness, be convenient to maintenance.This humidity generator compact conformation, volume is little, power consumption is little, cheap, use, easy to maintenance.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is the structural representation of the saturated salt formula humidity generator of the utility model scalable temperature;

Fig. 2 is (a) shown in Figure 1 for salt box under stand-by state and (b) is the structure section synoptic diagram at operating room's inner salt box;

Fig. 3 is the structural drawing of gas blender shown in Figure 1.

The setting of humidity point of fixity that Fig. 1 shows the saturated salt formula humidity generator of scalable temperature utilizes replaceable drawer type salt box to realize.Be in the salt box that humidity is provided with under the stand-by state and have 6, lay respectively at the both sides of operating room 9, and be symmetrically placed in separately the box cover 6, in order to changing easily from shell 1 front.In the calibration cell 2 resistance type heater is arranged, top, outer wall both sides is covered with semiconductor cooler 4, as the executive component of humidity control system.In order to improve the precision of constant temperature system, the calibration cell outer wall is surrounded by tight heat-insulation layer 3 except that refrigerator, has been full of water in the calibration cell as constant temperature liquid; It has enough volumes in design, guarantees big thermal capacity, to increase the ability of anti-heat exchange with outside.Simultaneously, the work of two symmetrical liquid stirrers 8 can make the quick balance of temperature of constant temperature liquid.The shell another side is provided with: temperature controller 10; The startup of temperature control system, stop button, accident signal disengage button, gas blender be totally four pushbutton switches 11; Water cut-off protection pilot lamp and refrigerator are crossed thermal light 12 and control power switch 13 and total power switch 14.

It is isolated with the constant temperature liquid 15 in the calibration cell 2 with salt box 5 wherein that Fig. 2 (a) illustrates box cover 6, when handle 17 is pulled out the salt box, is empty in the box cover, only communicates with atmosphere.It is isolated with operating room 9 with calibration cell 2 that Fig. 2 (b) illustrates sealed wall 19, and 9 have certain space 18 and constant temperature liquid 15 isolated again in the operating room, and the following of it can be inserted a salt box 5, and this salt box is the salt box under the duty.6 salt boxes are respectively charged into Licl, Mgcl ₂, NaBr, Nacl, Kcl, KNO ₃The saturated aqueous solution of 6 kinds of salt, corresponding 6 kinds of relative humidity points.The plug 16 that the termination in the outer part of salt box all has scum rubber to make clogs the outlet in the box cover outside, to guarantee under the working state of system excellent sealing and the insulation effect of atmosphere in the salt box.Below all be to guarantee that the temperature in the salt box is consistent with the temperature of calibration cell, and be the measure that improves temperature accuracy.Under the condition of constant temperature, the salt box of each stand-by state position, change in the operating room 9 after, a new humidity point of fixity can be set.Owing to must will destroy the humidity under the equilibrium state in the crude salt box through atmosphere in the salt box replacing process.Again this humidity of balance needs the regular hour in the operating room, in order to accelerate wetting balance, increases work efficiency, and in operating room 9, is provided with gas blender 7.

The stirring motor 20 that Fig. 3 illustrates gas blender is fixed on the shelf bracket 23, and by three stud bolts 21 that are installed with stage clip 24 be fixed on calibration cell on cover.The tension force of spring 24, can regulate by nut 22, this measure guarantees the moderate pressure between the dynamic part axle sleeve 25 of the drive disk assembly of gas blender, little axle 26 and the static part internal axle sleeve 27 on the one hand, both guaranteed the excellent sealing of operating room, guaranteed again that friction force was unlikely to the excessive motor normal rotation that influences between dynamic and static part.Three springs 24 in the motor operation course have played the effect of regulating the mobile equilibrium of motor simultaneously.Little axle 26 and internal axle sleeve 27 are for movingly, and apply oils in the middle of the oil groove 32 play the oil sealing effect.Little shaft material is a steel, and the internal axle sleeve material is a bronze, is processing and good fit between them before being convenient to assemble.Because the fluctuation of operating room's internal temperature also can produce very big influence to the balance of humidity when 0.2 ℃ of left and right sides.But stirring motor shaft 30 in the running changes 2000 rev/mins of scooters, and the temperature that causes that drives the friction of screw propeller 31 rotation heatings and driving parts raises, and substantially exceeds 0.2 ℃.For the rising that prevents temperature influence to the operating room, installed outer shaft 28 outside internal axle sleeve 27 again additional, material is a nylon 101, and has increased the pad 33 that the thermal insulation material polyphenyl foam is made, puddler 30 has also adopted nylon material, and above measure all plays a role in insulation.Sealed wall 19 is isolated calibration cell 2 with operating room 9.On structural design, leave a part around the running part simultaneously and can deposit the degree of uniformity that operating room's temperature has been strengthened in the space 29 of constant temperature liquid, when so just having avoided the gas blender running, because the friction of motor is conducted heat to the influence of operating room 9.

More than narrated embodiment of the present utility model, can make various improvement under the situation that does not depart from design of the present utility model, this explanation is not limited.

Claims

1. saturated salt formula humidity generator, comprise operating room and saturated salt container, it is characterized in that described operating room and saturated salt container are public operating room (9) and replaceable salt box (5), this salt box places in each self-packing box cover (6), the salt box is respectively charged into the saturated aqueous solution of different salt, all is in the calibration cell (2) of same temperature; Public operating room (9) seals, in gas blender (7) is arranged.

2. saturated salt formula humidity generator according to claim 1 is characterized in that replaceable salt box is a drawer type salt box (5), and the Packed adiabatic plug in the outer end of box (16) clogs the outlet in the box cover outside, can be respectively charged into Licl, Mgcl in the box ₂, NaBr, Nacl, KCl, KNO ₃The saturated aqueous solution of 6 kinds of salt.

3. saturated salt formula humidity generator according to claim 1 is characterized in that the volume of calibration cell (2) wants enough big in generator, is full of water in it, and is provided with well heater and two liquid stirrers (8); Calibration cell outer wall both sides are covered with semiconductor cooler (4), remove this, and outer wall is surrounded by tight heat-insulation layer (3).

4. saturated salt formula humidity generator according to claim 1, the motor (20) that it is characterized in that gas blender (7) is fixed on the shelf bracket (23), again by three stud bolts (21) that are installed with stage clip (24) be fixed on calibration cell on cover, the little axle (26) of this stirrer and internal axle sleeve (27) are for movingly, be the oil groove (32) of containing lubricating oil among the internal axle sleeve (27), outer shaft (28), the pad (33) of puddler (30) and insulation all adopt the moist adiabat material.