DE8519921U1 - Temperature sensor - Google Patents

Description

STSEBEL ELTRON Gm Holzminden / Weser

O 8.7.1985

File 691a

Temperature indicator

The invention relates to a temperature sensor of a water heater, with two in a single protective tube from its open end inserted temperature sensor cartridges, each of which is guided through the open end Capillary tube is connected, the psitron cross-section has at least partially approximately the radius of the protective tube.

C Such a temperature sensor is in DE-GM

1 798 J ^ -71 described. There the cartridges each point have a semicircular cross-section and their flat surfaces lie against one another. So you are standing always at the same height in the protective tube. If these cartridges were arranged one above the other in the protective tube, then poor heat transfer conditions would result. Another disadvantage of the sensor of DE-GM 1 798 471 is that that the sensors go together in the protective tube

have to be pushed, otherwise they shift each other. Another disadvantage is that the semicircular Cartridges with cone tips cannot be hammered. The capillary tube must rather be in a semicircular disc are soldered, which in turn is to be soldered into the cartridge tube.

In the case of a water heater's temperature sensor, there is usually one cartridge below and the one below another cartridge arranged further up in the protective tube. The one temperature sensor cartridge becomes a temperature controller switched. The other temperature sensor cartridge switches a temperature limiter. According to the state of Technique, the diameter of the cartridge closer to the open end is chosen to be smaller than the diameter of the cartridge open end further cartridge, so that the capillary tube is guided past the cartridge closer to the open end can be. This creates the interface between the cartridge near the open end and the protective tube very small, so that there is poor heat transfer.

The object of the invention is to propose a temperature sensor of the type mentioned, in which for a Passing the capillary tube past the one temperature sensor cartridge, the radius of which is not reduced overall 1st.

According to the invention, the above object is achieved in a temperature sensor of the type mentioned in that

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the cartridges are arranged one above the other in the protective tube and at least the cartridge closer to the open end has an indentation on its substantially cylindrical shell has, which stands back from the protective tube forming a channel and less on the circumference of the jacket than 18O, and that the capillary tube of the cartridge further away from the open end along the indentation between this and the protective pipe runs in the duct »

This ensures that the radius of the jacket the cartridge closer to the open end is essentially adapted to the radius of the protective tube, so that a good Heat transfer is guaranteed. Resting on the protective tube is not possible only in the area of the recess.

The protective tube diameter can be smaller than in cases in which the capillary tube must be passed next to a cartridge with a circular cross-section »

The cartridge further away from the open end can also be provided with the aforesaid indentation, as this facilitates heat transfer only slightly affected. Both cartridges are then designed the same, which simplifies storage .

However, it should be ensured that the cartridge further away from the open end does not coincide with that of the open end The cartridge closer to the open end is confused, then the cartridge further from the open end has no indentation. It then always the cartridge further away from the open end

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before the other cartridge jη the protective tube inserted.

Further advantageous embodiments of the invention result from the subclaims and the following description of an exemplary embodiment, in the drawing demonstrate:

Figure 1 shows a temperature sensor with two temperature sensor cartridges inserted in a protective tube and

FIG. 2 shows a section along the line II-II Figure 1, compared to Figure 1 enlarged.

A protective tube 1 has an open end 2. In the protective tube 1, temperature sensor cartridges 3 and ^ are inserted one above the other. Conical points 5 are hammered onto each cartridge 3, K. A capillary tube 6 is soldered to the one cone tip 5 of the cartridge 3. A capillary tube 7 is soldered to the other cone tip of the cartridge h.

The essentially cylindrical jacket 8 of the cartridge k is provided with an indentation 9. This takes up only about 55 ° on the jacket 8 (see FIG. 2). The recess 9 stands back in relation to the protective tube 1. This creates a channel 10 between the protective tube 1 and the indentation 9. The indentation 9 extends over the entire length of the cartridge h. It is pressed into the jacket 8 either before or after the cone tips 5 have been hammered into place.

Through, the channel 10 extends, the capillary tube Since it is hardly ideally straight, it presses the cartridge 4 against the protective tube 1.

The protective tube 1 has, for example, an outside diameter of 7 | 5 now with a wall thickness of 0.5 "The diameter of the cartridges 3 and k is 6 mm. The capillary tubes 6 and 7 have a diameter of 1 mm · The recess 9 * -st 1 mm deep *. The play shown enlarged in Figure 2 between the protective tube 1 and the cartridges h or 3 is provided to allow easy insertion of the cartridges 3 and k with tolerances of the nominal dimensions given for example.

In another embodiment, instead of the partially circular indentation 9 shown in FIG. 2, the indentation 9 can be formed by a flattening 11, which is shown in dashed lines in FIG. The flattening 11 also only occupies an angle on the circumference of the cartridge k or 3 which is significantly smaller than 180 °.

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Claims (7)

8.7.1985 claims 1. Temperature sensor of a water heater with two temperature sensor cartridges inserted into a single protective tube from its open end, each of which is connected to a capillary tube guided through the open end, the cartridge cross-section at least partially approximating the radius of the protective tube, characterized in that the cartridges (3 , k) are arranged one above the other in the protective tube (i) and at least the cartridge (4) closer to the open end (2) has an indentation (9) on its essentially cylindrical jacket (δ), which has a channel opposite the protective tube (1) (ίο) stands back and forms less than 180 ° on the circumference of the jacket (8), and that the capillary tube \ 6) of the cartridge (3) further away from the open end along the indentation (9) between this and the protective tube (i) in the Channel (1O) runs. 2, temperature sensor according to claim 1, characterized in that that both cartridges (3 »4) have the same indentations (9). 3. Temperature sensor according to claim 1 or 2, characterized in that the indentation (9) is part-circular is trained. 4, temperature sensor according to one of the preceding claims 1 or 2, characterized in that the Formation of a flattening (ii) is formed. 3. Temperature sensor according to one of the preceding claims, characterized in that both cartridges (3 »Ό have the same radii. 6. Temperature sensor according to one of the preceding claims, characterized in that the capillary tube (6 ) presses the cartridge (k) against the protective tube (1). 7. Temperature sensor according to one of the preceding claims, characterized in that the angle, the the indentation (9) on the circumference of aes shell (8) occupies, less than 90 °.