CN2035082U - Pen type humidometer - Google Patents

Abstract

The utility model discloses a pen type humidometer, which is a simple and reliable instrument for testing the soil water suction and indicating the irrigation rule of the plant; the utility model comprises a pen holder, a clay head, a transparent capillary pipe, a pen cap, etc. The utility model has the advantages of artful structure, easy fabrication and convenient operation; the pen type humidometer is suitable for testing the soil water suction of the field crop, and is also suitable for determining the time of household floral watering.

Description

Pen type humidometer

The utility model belongs to measuring technology, relates to a kind of instrument of testing soil moisture.

When plant needs is poured water, and can determine by the size of measuring soil water suction.During antecedent soil moisture, soil water suction is big, and during ground moistening, soil water suction is little.The common instrument of measuring soil water suction is a tensiometer, as vacuum phenotype tensiometer and mercury pressure type tensiometer etc.Though the mentioned strain meter has degree of precision, because its cost is higher, damage easily, the existence of shortcoming such as can pollute and volume is bigger, all be difficult to supply the commercial market.Nineteen sixty, Soviet Union scholar has designed a kind of air expansion formula tensiometer, though this tensiometer that replaces vacuum meter and mercury column manometer to make with the air column pressure gauge, its cost greatly reduces, but still have the following disadvantages: 1. structure is compact inadequately, is difficult for making the miniaturization product; 2. in can, when regulating in the kapillary air capacity, be difficult for kapillary is taken off from connecting pipe, easily connecting pipe is damaged simultaneously; 3. the proofed sleeve used of fixed capillary is aging easily, needs often to change, and changes difficulty.

Task of the present utility model is to design a kind of compact conformation, and is not fragile, and the Pen type humidometer of cheap testing soil moisture is to overcome the existing problem of prior art.

The utility model is finished in the following manner: fix a porous pot clay end in the lower end of a connecting pipe, the upper end of connecting pipe plays a part discharge, in connecting pipe, insert transparent capillary, this upper end closed capillaceous, the contact position of kapillary and connecting pipe can seal by rubber stopper.Generally, except that the upper end of kapillary is filled with the air column of certain-length, all be full of air free water in the inside and the lower end capillaceous of connecting pipe and porous pot clay end.

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

Fig. 1 is the Pen type humidometer cut-away view;

Fig. 2 is the Pen type humidometer outside drawing.

With reference to Fig. 1, porous pot clay end (1) is being fixed in the lower end of connecting pipe (2), and it is the inductive means of instrument, various pores are arranged on the wall, after by water infiltration, in pinhole, formed moisture film, after Pen type humidometer inserted soil, the moisture film and the holard of potter's clay wall coupled together.Connecting pipe (2) seals with the contact site available epoxy and the 704 glue epoxy glue glue of porous pot clay end (1).Kapillary (3) inserts in the connecting pipe (2) by rubber stopper (5), the upper end closed of kapillary (3), and the lower end is with a little block (4), and little block (4) lower sides has an aperture (8).The effect that adds little block (4) is to stop the bubble of overflowing under the negative pressure condition to enter kapillary (3), to keep the measuring accuracy of this device, simultaneously because the sidewall of little block (4) has an aperture (8), can make that waterpower links to each other between kapillary (3) and the connecting pipe (2), vacuum tightness changes (being that soil water suction changes) and can promptly be reflected in the variation of the interior air column of kapillary (3) in the instrument.The upper end of connecting pipe (2) forms collection chamber (7).Be with a sleeve pipe (6) on connecting pipe (2), sleeve pipe (6) both can play the effect of protective hair tubule (3), can beautify this device again simultaneously, made it form the lip pencil outward appearance.

In conjunction with Fig. 2, preferably indicate scale (9) on the kapillary (3), so that can observe the situation of change of the interior air column of kapillary (3) intuitively.In order to observe the variation of the interior air column of kapillary (3) easily, so kapillary (3) should be made with transparent material.Sleeve pipe (6) preferably is provided with view window (10) corresponding to scale (9) position of kapillary (3), so that do not take off the situation of change that sleeve pipe (6) just can be observed the interior air column of kapillary (3) in use.If there is not scale (9) on the kapillary (3), then can put on similar scale on the next door of the view window (10) of sleeve pipe (6), its effect is consistent.On sleeve pipe (6), also can set up a clothes peg with reference to the common pen cap, be convenient to be clamped on the pocket Pen type humidometer or other places.

The using method of this Pen type humidometer is as follows:

1, prepares one glass of cold water that just has been chilled to room temperature.Because of water after boiling, the air that is dissolved in the water is overflowed, therefore, fresh cold water is called air free water.

2, pot clay end was immersed bubbly water 5～10 minutes.

3, water filling: unload running casing and open rubber stopper; The little block of glass capillary lower end is taken away; Dropper is chewed the thin plastics silk that connects insert in the kapillary, until the leading edge arrival scale zero-bit place of plastics silk; Transparent capillary is submerged in the air free water; Pinch rubber ball on the dropper, inhale the following air of a scale that zero-suppresses; Pull out thin plastics silk, air free water promptly enters and is full of in the following kapillary of zero graduation line; In little block, fill with air free water, and lid is enclosed within lower end capillaceous.In connecting pipe, fill with air free water.Kapillary is inserted connecting pipe, the jam-pack rubber stopper.

4, degasification:, can carry out deaeration step for improving the sensitivity of Pen type humidometer.Way is that the Pen type humidometer of injecting good water is dried pot clay end with dried cloth.Appoint the interior moisture of Pen type humidometer outwards to evaporate from pot clay end.When water column meniscus in the kapillary arrives 50Kpa,, bounce connecting pipe gently with the Pen type humidometer pot clay end down, the interior bubble of Pen type humidometer is risen in the collection chamber.Then, pot clay end is immersed in the air free water, at this moment can see, the water column meniscus rises to zero graduation very soon in the kapillary.Open rubber stopper again, in connecting pipe, fill it up with air free water, filled in rubber stopper.

After above-mentioned deaeration step repeated two times, the sensitivity of Pen type humidometer increased greatly, and the equilibration time of reaction shortens.

5, on soil to be measured, make a call to an aperture with little earth boring auger or waddy.The diameter in hole should be slightly less than the diameter of Pen type humidometer.The degree of depth in hole, concerning pot flowers, should pierce about 2/3rds degree of depth of whole soil layer and get final product.Then, off-the-shelf Pen type humidometer is inserted in the hole, pot clay end is contacted closely with soil, and press the penholder surrounding soil real a little.Under soil moisture unsaturation situation, the meniscus of water column promptly moves down in the Pen type humidometer.After vacuum tightness in the instrument and soil water suction reached balance, meniscus was no longer mobile.We promptly know soil moisture suction from the transparent capillary scale.Pen type humidometer both can be embedded in a certain measuring point, and the long-term observation soil moisture dynamic variation can be buried underground between each measuring point again in turn, and circulation is observed.Soil water suction value according to some flowers fruit trees and vegetables is watered with the foundation of science.

The utility model manufacturing is simple, and is with low cost, and structure is ingenious, and good looking appearance is not fragile, very convenient during the interior air column of embedding capillary, only needs extract rubber stopper at tube connector, and the little block of leaving behind can operate. Although make negative pressure (soil water suction) display unit of tensometer with the air expansion depressimeter, its precision is subjected to the impact of variations in temperature and air pressure change, but the soil water suction numerical value of this impact for whether to need determining to pour water is negligible. Affected by the error of graduation at the bargain-hunting power section bigger although the negative pressure display device of making tensometer with the air expansion depressimeter also exists, yet most plant need not to pour water at the bargain-hunting power section. This negative pressure display device (being the Pen type humidometer described in the present specification) display precision behind negative pressure＞0.1 bar is higher, and negative pressure bigger (being that soil water suction is higher), and precision will heal high. The soil water suction section that most plants need to be poured water is 0.1 bar～0.5 bar, and therefore, this Pen type humidometer will be applicable to most plants indication irrigation usefulness.

Claims (5)

1, a kind of Pen type humidometer is made up of connecting pipe, porous pot clay end and transparent capillary, it is characterized in that kapillary inserts in the connecting pipe upper end closed capillaceous by rubber stopper.

2, according to the Pen type humidometer of claim 1 regulation, it is characterized in that bottom capillaceous is with a little block, tegillum cap lower sides has an aperture.

3, according to the Pen type humidometer of claim 1 or 2 regulations, it is characterized in that kapillary is marked with scale.

4, according to the Pen type humidometer of claim 3 regulation, it is characterized in that being with on the connecting pipe sleeve pipe.

5, according to the Pen type humidometer of claim 4 regulation, its feature sleeve pipe is provided with view window.