CN2490822Y - High sensitive gas-liquid thermometer for vegetable greenhouse - Google Patents

Abstract

The utility model provides a high sensitive gas-liquid thermometer for vegetable greenhouse which comprises a gasbomb 9, an upper U-shaped glass pipe 6, a lower U-shaped glass pipe 1, a storage liquid pool 5 and an alarm circuit 3. When the environment temperature and the gas pressure sealed in the gasbomb change, the color liquid pillar lifting of storage liquid pool 5 is driven by pressure; therefore the height of the color liquid pillar in pipe 2 also changes up and down. The changing reacting of the height of the color liquid pillar in pipe 2 is just the change of the environment temperature. When the color liquid pillar reaches the limiting temperature, the liquid pillar which is connected with the power to alarm or send other controlling signals as one part of the circuit. If the gasbomb is replaced by beer bottle, the cost of the high sensitive gas-liquid thermometer is lower.

Description

Green house of vegetables high sensitivity vapor-liquid temperature meter

The agriculture instrument field that the utility model relates to is to be used in a kind of high sensitivity vapor-liquid temperature meter in the green house of vegetables specifically.

Vegetables producing region, the north in winter vegetable greenhouse booth is all over the floor, but seldom be placed with thermometer in the discovery booth, promptly be that to be placed with thermometer in the booth also be indoor thermometer, to compare size too little with the broad space of booth, if be put into the place of correct response greenhouse temperature, because of vegetables are with luxuriant foliage and spreading branches in leafy profusion, have only in face of very near and just can see the temperature indication clearly, very inconvenient.And the sensitivity of general indoor thermometer only is 1.5 millimeters/℃, and the rate of handling seperately is too low.More unqualified temperature alarming function makes vegetables be in the temperature of unfavorable growth often, makes vegetables be subjected to freeze injury owing to various.The in time convenient temperature variations of understanding in the booth, very crucial to having planted winter vegetable, but look through domestic and foreign literature and observe on the current market, do not have to find to be fit to be exclusively used in the thermometer of winter vegetable booth, necessary to design large scale high sensitivity thermometer.

The purpose of this utility model is exactly at the indoor temperature meter, the defective that exists when in the vegetable greenhouse booth, using, and it is big to propose a kind of size, highly sensitive, temperature is indicated bright-colored eye-catching, just can see the temperature indication clearly within 10 meters, less expensive again thermometer; And have the automatic warning of limiting temperature or, send the high sensibility vapor-liquid temperature meter of control signal to green house of vegetables heating and cooling equipment.

Technical solutions of the utility model can adopt following measure to realize.

U type glass tube one end is inserted with in the glass gas bomb of bottle closure of rubber, the other end of U type glass tube is connected by the U type pipe that has liquid storage tank with soft rubber tube and another, have in the U type pipe of liquid storage tank and be placed with the conducting liquid that some has bright-colored, on the plank of the right pipe of the U type glass tube that has liquid storage tank next door, be carved with temperature sign numerical value; On the appropriate location that is placed with colorful conductive liquid U type pipe bottom and both sides glass tube, also wanting has the metal of fine coupling can cut down (a kind of iron-nickel alloy) conductive connector with glass tube in the sealing-in, and one forms the limiting temperature warning circuit fully.Also insert another glass tube on the bottle stopper of sealing gas storage bottleneck, auspiciously glass tube outside be connected to one section soft rubber tube, this pipe communicated with atmosphere before thermometer is installed correction.

The utility model advantage is significantly, highly surpass one meter, sensitivity can reach 2.4 centimetres/℃, can report to the police at limiting temperature, inexpensive, within 10 meters the temperature indication very clear.

Below in conjunction with accompanying drawing and example the utility model is further specified.

Fig. 1 is a schematic diagram of the present utility model.

Wherein: 1, U type glass tube, 2, temperature indication glass tube, 3, limit the humidity circuit, 4, the soft rubber tube joint, 5, liquid storage tank, 6, go up U type pipe, 7, be with the glass tube of soft rubber tube, 8, the soft rubber tube node, 9, gas bomb, 10, plank.

Be how behind the color liquid of can under the different environmental temperatures, to use experimental method Tc meter below.

We suppose environment initial temperature t ₁=20 ℃, glass in the gas bomb 9 and rubber hose 7 are openings, we pour into colored conducting liquid from the upper port of color liquid elevating glass pipe (calling color liquid pipe in the following text) 2, the band color liquid is added to the position that our calculated in advance is stipulated well in color liquid pipe 2, this position is decided to be 20 ℃, because U type pipe both sides are UNICOM's atmospheric pressure all, so U type pipe both sides liquid storage tank 5 liquid levels and color liquid pipe 2 liquid level pressure are balances, promptly two liquid levels are on a horizontal plane.We prick glass and soft rubber tube (calling glass rubber pipe in the following text) 7 after death, after environmental temperature changes, the pressure of gas also changes in the gas bomb 9, pressure balance in the U type pipe 1 is destroyed, colored liquid-column height in the color liquid pipe 2 is changed, make U type glass tube 1 reach new pressure balance at last, colored liquid-column height is exactly new environmental temperature indication in the color liquid pipe 2; During can colorful conductive liquid, if environmental temperature greater than 20 ℃, the colour liquid of can still arrives till 20 ℃ of scales, then by glass rubber pipe 7 inflation in gas bomb 9, till the colored fluid column in color liquid pipe 2 is raised to the environmental temperature scale; When if environmental temperature is lower than 20 ℃, will outwards bleed (generally not wishing to occur this situation) by glass rubber pipe 7, the colorful conductive fluid column in the color liquid pipe 2 is dropped to till the environmental temperature scale, it is dead at last the glass rubber to be managed the soft rubber tube ligation of 7 outsides.This is that the equilibrium temperature of regulation U type pipe 1 is 20 ℃ and is precondition after because of us each size being determined.Carrying out other temperature signs need calculate under the different temperatures by carat amber dragon equation of gaseous state formula, and diverse location carries out scale in color liquid pipe 2, carries out variant temperature scale for certificate on color liquid pipe 2 next doors according to this.As everyone knows, carat amber dragon equation of gaseous state is linear at normal temperatures, if color liquid pipe 2 inside radius are uniform, calculate the distance (the face formula 1 as follows) of two groups of temperature datas with the Ke Shi equation, be easy to the sensitivity of accounting temperature meter, just available equidistant way is carried out the scale of other temperature.

Be to determine its temperature scale below with equation of gaseous state.

For example we get gas bomb and reach the volume V that goes up space sums such as U type pipe 6 ₁=2000 centimetres ³, the inside radius R=2 of liquid storage tank 5 centimetre, the inside radius r=0.5 of U type pipe centimetre, gas bomb initial pressure P ₁Be an atmospheric pressure, the environment initial temperature is from t ₁=20 ℃ rise to t ₂=40 ℃, use clapeyron equation:

P: pressure, kilogram

P ₁V ₁/ T ₁=P ₂V ₂/ T ₂------(1) V: volume, centimetre ³

T: absolute temperature, ℃ can calculate the height that the colored fluid column on the right rises.Color as calculated liquid pipe 2 colored fluid columns have risen 48.35 centimetres from 20 ℃ equilbrium position, i.e. sensitivity is 2.4 centimetres/℃, and we just are shown in color liquid pipe 2 next doors to other scales of thermometer that will identify easily like this.In order to reduce cost, gas bomb can be used beer bottle instead and replace, and the beer bottle volume is V ₁=700 centimetres ³If r=0.5 centimetre of U type pipe inside radius, the inside radius R=2 of liquid storage tank centimetre, when initial temperature when 20 ℃ rise to 40 ℃, 31.64 centimeters that should rise from 20 ℃ of original equilbrium positions of the colored fluid column in U type pipe 1 the right glass tube 2, sensitivity is 1.58 centimetres/℃, for reducing cost, can though sensitivity descends, accomplish the waste and old material utilization with old beer bottle as gas bomb fully.

Under speak face to face alarm circuit 3, still establish 2000 centimetres of gas bomb volumes ³Be example, sensitivity is 2.4 centimetres/℃, the radius R of liquid storage bottle=2 centimetre.Suppose temperature when 20 ℃ drop to 12 ℃, the liquid storage tank liquid level should rise 1.2 centimetres as calculated, and liquid storage tank 5 is filled with.If supposition is reported to the police when 10 ℃ of low temperature, when temperature when 12 ℃ are continued to drop to 10 ℃, the colored fluid column in U type pipe 1 left side has risen to liquid storage tank top glass tube 4.8 centimeters, we just in this glass tube position sealing-in a metal can cut down binding post, be 10 ℃ of warning binding posts herein; High temperature alarm limiting temperature binding post definite the same.U type pipe 1 bottom is the public conductive connector of high low temperature.When humidity changes colored fluid column lifting and touches conductive connector, connect power supply and report to the police as the colored fluid column of the part of conducting wire, or send other heating and cooling equipment of signal starting green house of vegetables.From as can be seen last, the height of liquid storage tank has strictness to ask, otherwise low temperature can't be reported to the police.Colour liquid in the U type pipe can be water or other conducting liquid, if water can add small amount of acid or alkali, but water subzero to freeze and also normal temperature under evaporation very fast, be impossible arrive zero degree in the general green house of vegetables; For preventing too fast evaporation, can drip several oil drippings at liquid surface, glass tube 2 upper sheds cover with rubber cap, only prick an aperture.

If according to 2000 centimetres ³Gas bomb is an example, and temperature changes to 40 ℃ from 0 ℃, and colored fluid column changes distance and reaches 96 centimetres, and the height of this vapor-liquid temperature meter will be above one meter in other words.No matter be gas bomb or U type glass tube, all be breakables, can utilize prior art to be fixed on the special moistureproof plank 10, or on the special plastic plate.Gas bomb is protected with the porous iron sheet, the effective fluting iron sheet of U type is protected.The temperature indication of this thermometer sees clearly Chu fully outside 10 meters.

Claims (2)

1, a kind of green house of vegetables high sensitivity vapor-liquid temperature meter, it is characterized in that: on a plank (10), be placed with a bottle (9) that contains air, be inserted with two glass tubes by the bottle closure of rubber on the bottleneck, wherein one is (7) that have soft rubber tube on the glass tube, another is to go up U type glass tube (6) left end, right-hand member at last U type glass tube (6), be connected with the U type glass tube (1) that has colored liquid storage tank (5) by soft rubber tube joint (4), in the colored liquid storage tank (5) and the color liquid elevating glass pipe in the right (2) of U glass mould pipe (1), the colored aqueous solution of conduction is housed; High and low temperature limiting temperature warning circuit device (3) also has been installed on U type glass tube (1).

2, green house of vegetables high sensitivity vapor-liquid temperature meter according to claim 1 is characterized in that: the conduction colour liquid is alkali or the aqueous acid that adds pigment.