LT3905B - Cover for temperature sensor - Google Patents

Abstract

The temperature sensor sleeve is fitted through an opening (11) in a pipe or container wall (10) and has a deep-drawn metal sleeve element (13) which is closed at its inner end (14), its opposite end having a flange (15) pressed against a shoulder (12) of the wall opening, to form a gas- and liquid-tight seal via a clamp nut (21)

Description

The invention relates to a temperature measuring device, namely, a temperature sensor sleeve for inserting a temperature sensor into a hole in the wall of a tube or vessel.

When measuring the temperature of the liquid or gas contained in or passing through pipes or vessels, the temperature sensor shall be positioned so that it is surrounded by the liquid to be measured. This can be achieved by inserting a temperature sensor into the hole in the wall of the tube or vessel. However, the temperature gauge must be protected against mechanical damage and tightly seated in the pipe or vessel wall opening to prevent any leakage of liquid from the pipe or vessel system. This can be achieved by inserting a temperature gauge into a tubular metal sleeve, the inner end of which is closed, and a sealing gasket is inserted between the outer part of the sleeve and the contact or edge of the hole.

There is a known temperature gauge mandrel having an elongated tubular housing threaded with a sleeve holding the thermometer stem and sealing means. the bracket has a separate joint, which is screwed into an opening in the wall of the container (see British Patent GB 2027884).

It is known to have a temperature gauge sleeve made of a solid piece of metal pipe so that its inner end has a smaller diameter than the outer one. The inner end of the tube is closed. At the other end of the pipe, a radial flange and sealing elements made individually (see German patent D E 2139161) are provided at their entire perimeter.

Known temperature gauge sleeves are complex and expensive to manufacture because they use metal cutting and welding technology.

The object of the invention is to simplify the construction of the temperature sensor sleeve and to reduce its production costs.

The solution to this problem is to insert a temperature gauge in the sleeve into a hole in the wall of a tube or vessel having a first tubular metal body. perforated edges or cavities, said tubular body is integral and formed by deep stretching.

Deep drawing of a single piece of tubular casing from one workpiece avoids welding work and eliminates the need for many pieces to be joined, which reduces the risk of leakage. Depending on the length of the tubular casing, other dimensions and the type of workpiece it is made, deep stretching can be done one or more times.

It is often desirable to have a tubular body of two lengths, each having a substantially constant internal diameter, while at the same time having an outer length greater than the inner length. In this case, deep stretching is performed in two steps, first the outer part of the length and then the inner part of the smaller inner diameter. The tubular housing may also be made of more lengths, and the individual diameters of the individual lengths may be reduced inwardly. The transitions of individual consecutive sections may be tapered.

In order to transmit the temperature measurement signals to the outside, the temperature sensor mounted on the bushing is connected by means of a wire or electrical conductor from the bushing to a dedicated automatic recording device or display. In this case, the temperature gauge sleeve may have another tubular housing at both open ends and which, at its inner end, has a radial flange pressed against the first housing's radial flange by a clamping device. This second tubular housing protects the wire or electrical conductor passing through it.

The radial flanges of the first and second tubular casings may be unrelated to one another and only pressed against each other by a tensioning device.

Better design when flanges are reinforced with one another, eg by electric or contact welding. This welding is intended not only to secure the temperature sensor bushing parts to one another, but also to ensure tightness.

The clamping devices can be various. However, it is preferable for the clamping nut to be threaded into the threads of the pipe or vessel wall above the said edge or hook. The hole in the tube or the wall of the vessel, the edge or the flange of the bushing inserted therein, and the threads must be coaxial (coaxial).

The temperature sensor sleeve parts can be made of any suitable material. To prevent corrosion, at least the first tubular housing in contact with the liquid contained in it or in the container must be made of stainless steel. The second tubular casing is also best made of stainless steel.

The invention will now be explained by the following drawing which illustrates the best embodiment of the temperature sensor sleeve according to the invention with a temperature sensor mounted in the wall of a pipe or vessel.

The drawing shows the wall of a pipe or vessel, which may, for example, be part of a pipe or vessel with hot water or steam, which may be part of a central heating or district heating system.

The pipe or vessel may also be part of other systems with other gases or liquids, such as those used in industrial installations. The wall of the tube or vessel has a hole 1. The outer portion of the hole has a diameter larger than the inside and has an outwardly projecting round edge or flange 2. The temperature sensor sleeve 3 has a built-in tubular body 3 made of metal, best of stainless steel. The inner tube-shaped body 3 consists of an outer length portion 4 and an inner length portion 5 having an inner diameter smaller than the outer length portion 4. There is a tapered transition 6 between the two length portions. The inner end 7 of the length portion 5 is closed.

The temperature sensor sleeve has a second tube-shaped portion 8 with an annular outer flange 9 at its inner end, which fits to the annular flange 10 and is, for example, spot-welded or electrically welded to the annular flange 10. The outer opening 1 has internal threads a clamping nut 11 is screwed on the tube-shaped part 8. By tightening the clamping nut 11, both flanges 10 and 9 are pressed in the direction of the clamp 2, while the sealing ring 12 between the flange 10 and the clamp 2 is clamped. The clamping nut 11 in the screwed-in position can be locked by passing a sealing wire or something else through the hole 13 in the nut head. The temperature sensor 14 is inserted into the inner length portion 5 of the temperature sensor sleeve 5. Preferably, the outer diameter of the temperature sensor corresponds to the inner diameter of the sleeve length portion, so that the temperature sensor 14 and the sleeve length portion 5 are in good heat transfer contact. An insulated electrical wire 15 is connected to the temperature sensor and is pierced through a tubular portion

8. Wire 15 transmits measurement signals from a temperature sensor to an automatic recorder or display not shown in the drawing.

Claims (6)

DEFINITION OF INVENTION A temperature sensor sleeve for inserting a temperature sensor (14) into a hole (1) in a tube or vessel wall having a first tubular body (3) having an inner end (7) closed and an radial flange at its outer end. (10), pressed together by a clamping device (11) on a pipe> or a perforated .ge or notch (12) on the wall of the vessel, characterized in that the tubular body (3) is integral and deep-drawn. A temperature sensor sleeve according to claim 1, characterized in that the tubular body (3) has length portions (4,5), each having a substantially constant inner diameter, and an outer diameter portion (4) having an inner diameter greater than the inner diameter. of the length portion (5). Temperature sensor sleeve according to Claim 1 or 2, characterized in that it has a second tubular body (8) at both open ends and a radial flange (9) at its inner end, which is pressed against the first pipe by a clamping device (11). of the radial flange (10) of the shaped body (3). 4. Temperature sensor sleeve according to Claim 3, characterized in that the radial flanges of the first and second tubular bodies (3, 8) respectively are interconnected, for example by welding. 5. Temperature sensor sleeve according to claims 1 to 4, characterized in that the clamping device comprises a clamping nut (11) which is threaded into the threads of the pipe or vessel wall above said edge or clamp (2). 6. Temperature sensor sleeve according to claims 1-5, characterized in that the first tubular body (3) and preferably also the second tubular body (8) are made of stainless steel.