CN2304904Y

CN2304904Y - Constant temperature oven

Info

Publication number: CN2304904Y
Application number: CN 97222419
Authority: CN
Inventors: 潘敏峰; 潘世华
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-24
Filing date: 1997-07-24
Publication date: 1999-01-20
Anticipated expiration: 2007-07-24

Abstract

The utility model relates to a constant temperature tank used for a temperature tester, comprising a tank body (1) made of metallic materials and a heat transferring casing tube (2) made of the metallic materials and coaxially sheathed in the tank body. The heat transferring casing tube (2) is provided with a hole cavity (4) for placing a temperature element. The utility model is characterized in that the tank body (1) and the heat transferring casing tube (2) are cones.

Description

Calibration cell

The utility model relates to the industry spot inspection, demarcates the temperature calibrating installation that temperature sensor is used, and refers to the calibration cell that uses in a kind of small portable temperature calibrating instrument especially.

At present, the calibration cell that produce to use countries in the world as shown in Figure 1, it comprises cell body 1, is placed in the heat transfer sleeve pipe 2 in the cell body.Cell body and sleeve pipe adopt the metal heat-conducting material to make more, and its shape all is cylindrical.In order to make heat transfer sleeve pipe 2 be convenient to change, must leave enough clearances between cell body and the heat transfer sleeve pipe, be generally 0.2 millimeter.The thermal resistance between cell body and the heat transfer sleeve pipe has been strengthened in this gap, has reduced the heat transfer between constant temperature cell body and the heat transfer sleeve pipe and the precision of instrumental calibration thus.On the other hand, if this reservation air gap is too little, because the foreign matter or the inhomogeneous microdeformation meeting that causes of conducting heat extremely can't be taken out the heat transfer jacket pipe clamp.

The purpose of this utility model is to overcome the shortcoming that exists in the above-mentioned prior art, a kind of new calibration cell is proposed, this calibration cell can not only reduce the air gap between cell body and the heat transfer sleeve pipe widely, and can get rid of foreign matter fully and die from the interior phenomenon of cell body with the heat transfer jacket pipe clamp that distortion causes.

The calibration cell that the utility model proposes comprises the cell body made with metal material and makes with same material, the coaxial heat transfer sleeve pipe that is placed in the cell body, cell body and heat transfer sleeve pipe are provided with the vestibule that temperature element (TE) is installed, and it is characterized in that: described cell body and heat transfer sleeve pipe are cones.

Below in conjunction with accompanying drawing and most preferred embodiment the utility model is described in detail, wherein:

Fig. 1 is the synoptic diagram of calibration cell in the prior art;

Fig. 2 is the synoptic diagram of the calibration cell that the utility model proposes;

Fig. 3 is the synoptic diagram of cell body in the utility model;

Fig. 4 is the synoptic diagram of heat transfer sleeve pipe in the utility model.

As shown in Figure 2, the utility model comprises the cell body 1 made with the anti-oxidation metal Heat Conduction Material and makes with same material, the coaxial heat transfer sleeve pipe 2 that is placed in the cell body.All be laid with the vestibule that temperature element (TE) is installed on cell body 1 and the heat transfer sleeve pipe 2, it is characterized in that cell body 1 and heat transfer sleeve pipe 2 all are cones.Because cell body and heat transfer sleeve pipe have adopted cone structure, reduced the air gap between cell body and the heat transfer sleeve pipe widely, make heat transfer between the two be similar to transmission of heat by contact, improve the homogeneity in heat-conductive characteristic and calibration cell temperature field thus widely, and avoided the heat transfer jacket pipe clamp to die from the phenomenon that to take out in the cell body.

On the other hand, because the air gap between cell body and the heat transfer sleeve pipe is very little, the flowability of air is poor, and the temperature field is even, can reduce the length of calibration cell under the condition of same precision.

The range of taper of cell body and heat transfer sleeve pipe is at 0 ° 4 ' 27 " to 2 ° 4 ' 27 " in the utility model.In a most preferred embodiment of the present utility model, tapering is 1 ° 4 ' 27 ".

Generally be laid with four vestibules 4 on the heat transfer sleeve pipe, as shown in Figure 4.In the utility model, the radial distance that distributes between these four vestibules is different vertically, four vestibule spacings of heat transfer sleeve bottom are very little, so the temperature difference is very little, generally be no more than 0.05% of working temperature, and the distance between four holes, heat transfer sleeve pipe top is bigger, helps arranging the extension line of sensor, desired spaces such as handle and terminal box.The ingenious design of this inclined hole makes the temperature difference between bottom land temperature measuring area four holes reduce to minimum, and slot-open-section provides effective operating space for temperature sensor miscellaneous.

In sum, the utility model has not only overcome lacking of existing in the prior art Point, and improved widely the precision of temperature measuring and verification, it is a kind of to can yet be regarded as Practical, creative well-designed.

Claims

1, a kind of calibration cell, it comprises the cell body made from metal material (1), with make with same material, the coaxial heat transfer sleeve pipe (2) that is placed in the cell body, heat transfer sleeve pipe (2) is provided with the vestibule (4) that temperature element (TE) is installed, and it is characterized in that: described cell body (1) and heat transfer sleeve pipe (2) are cones.

2, calibration cell as claimed in claim 1, the range of taper that it is characterized in that cell body (1) and heat transfer sleeve pipe (2) are 0 ° 4 ' 27 " to 2 ° 4 ' 27 ".

3. calibration cell as claimed in claim 1 is characterized in that: the tapering of described cell body (1) and heat transfer sleeve pipe (2) is 1 ° 4 ' 27 ".