CN87213747U - Flat spring tube pressure type thermometer - Google Patents

Abstract

The utility model discloses an improved spring tube pressure type thermometer which presses the original bourdon tube into a flat shape, makes a reinforcing groove at the middle part of the Bourdon tube in the longitudinal direction by pressing, presses a capillary tube into the flat shape so as to decrease the volume in a closed system to the minimum and then charges the nitrogen with certain pressure into the closed system. A probe is full of the mixtures made of zeolite and active carbon, so the probe becomes smaller, and therefore, the problems that the thermometer is influenced by the environment temperature and the scale displays nonlinear phenomenon are solved, and the requirement of measuring the temperature in a small range and locally is achieved. As a result, the thermometric distance, the thermometric range and the field of application are enlarged.

Description

Flat spring tube pressure type thermometer

The utility model belongs to a kind of improved temperature measuring instrument.

Pressure-spring thermometer commonly used is by Bourdon tube, the closed system that kapillary and probe are formed, and inside charges into fluid media (medium); Bourdon tube and indicating mechanism are contained in and form a complete temperature instrumentation in the watchcase.When probe contact testee, along with probe temperature raises or reduction, its internal flow medium expands thereupon or shrinks, and impels the Bourdon tube mechanical shift, drives indicating mechanism's indicated temperature.According to the difference of filling fluid media (medium), can be divided into liquid-type, steam formula, three kinds of thermometers of gas type.From present operating position, all there is certain defective in these three kinds of thermometers, and 1, the liquid-type thermometer is influenced by environmental temperature, the thermometric distance lack (generally in 5 meters), if will strengthen the thermometric distance, must increase the full compensation mechanism of a cover complexity.2, the size of its probe of steam formula thermometer is done greatlyyer, can't carry out little position and measure, and simultaneously, in use, scale is shown as non-linear demonstration, and temperature-measuring range is less.3, the gas type thermometer is easily influenced by ambient temperature, and it is also bigger to pop one's head in, and little position is measured and can't be carried out, and range of application is restricted.

The purpose of this utility model is exactly in order to solve the deficiency of above-mentioned existence, provides that a kind of temperature-measuring range is wide under certain accuracy requirement, the thermometric distance, and it is little to pop one's head in, the pressure-spring thermometer of characteristics such as applied range.

Main solution of the present utility model is to change Bourdon tube and planform capillaceous, makes the fluid media (medium) amount that charges into reduce to minimum.Simultaneously, in probe inner stuffing matter, dwindle probe size.It is achieved in that makes flat flat with the Bourdon tube cross section, and two walls of pipe are fit together, and longitudinally is provided with a strengthening groove along Bourdon tube middle part or its cross section is an arc.Like this, when reducing to minimum, the Bourdon tube internal capacity also guaranteed the rigidity of itself.For the fluid media (medium) that is filled in the further minimizing system, cross section capillaceous is also made flat flat-shaped, make that two walls fit together in the pipe, reduced internal capacity capillaceous.It is minimum that the amount of the fluid media (medium) that can make in the system like this to be filled reduces to.Thereby reduced the influence that is subjected to environment temperature and improved non-linear that scale shows.Improved temperature measurement accuracy.In addition, dwindle the size of probe, and fill the potpourri of zeolite and activated charcoal within it, improve the thermometric performance, enlarge application, make the part, the temperature at little position also can accurately be measured, and can also save required metal material.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a bowden tube section synoptic diagram in the utility model.

Fig. 3 is that the bowden tube section is the synoptic diagram of arc shape in the utility model.

Fig. 4 is a kapillary schematic cross-section in the utility model.

Below in conjunction with accompanying drawing the utility model is done more detailed introduction.A tin-phosphor bronze pipe is promptly carried out roll compacting through bakingout process with after cleaning, should keep certain temperature during roll compacting, make it enough plasticity, the two side of pipe fits together after the roll compacting, and tube wall does not produce macroscopic deformation, guarantees gas communication.And longitudinally to be rolled into corresponding strengthening groove or cross section in the middle according to the Instrumentation Requirement size be arc, then this flat flat tube curved the arc about 270 °, forms a complete flat flat Bourdon tube (2).Be rolled into flat flat-shaped with two kapillaries different in size (4) (5), their end all is welded on the Bourdon tube (2), and wherein to be welded on the ratio of being filled be on 5:1～zeolite of 1:5 scope and the probe of Mixture of Activated Carbon (6) to the other end of long capillary (4).The other end of short capillary (5) then gives over to inflation and uses.The ratio of the potpourri in the probe is according to the scope of dut temperature and difference.The fluid media (medium) that is filled in Bourdon tube (2) and the kapillary (4) is selected drying nitrogen for use, and charges into the drying nitrogen of 1～2.5 atmospheric pressure by temperature-measuring range (range) size of instrument.Bourdon tube (2), kapillary (4) and probe (6) three are connected to become a complete closed system.The other end of Bourdon tube (2) and indicating mechanism (3) join.Bourdon tube (2) and indicating mechanism (3) packed in the watchcase (1) and fixing, form a complete temperature instrumentation.

The utility model has solved influenced by ambient temperature preferably and the scale demonstration is nonlinear problem, also reduce simultaneously the size of probe and saved material, improved temperature measurement accuracy, so that get the thermometric distance of pressure-spring thermometer, temperature-measuring range and its application have obtained very big improvement.

Claims (3)

1, a kind of pressure-spring thermometer, it is by Bourdon tube (2), kapillary (4) (5), probe (6) is formed a closed system, inner fluid-filled medium, this system and indicating mechanism (3), watchcase (1) is formed a complete temperature instrumentation, it is characterized in that described Bourdon tube (2) cross section is flat flat-shaped, its middle part longitudinally is provided with a strengthening groove, or its cross section is an arc.

2, thermometer as claimed in claim 1 is characterized in that described kapillary (4) (5) is flat flat-shaped.

3, as claim 1 and 2 described thermometers, it is characterized in that being filled with in the described probe potpourri of zeolite and activated charcoal, the ratio of potpourri is in 5:1～1:5 scope.

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