DE1873668U - WIRE-COILED ELECTRICAL RESISTOR WITH IMPROVED EXTERNAL PROTECTION. - Google Patents

Description

The increase in price relates to improved external protective bodies for wire-wound resistors.

Purely the two exemplary embodiments according to FIGS. 1 + 2 and 3 + 4 the reference numbers used have the following meaning:

Digit 1 ..

Number 2 .. Number 3 - Number 4. ·

Clause S. Clause 6 ..

Section 7-.

Item 8 .. Item 9. ·

Item 10 Item 11.

ceramic support body, preferably designed as a tube and consisting of a material with relatively good thermal conductivity,
Resistance wire,
metallic clamps,

Putty with insulating properties, chemically inactive compared to parts 2,

semi-tubular bowls made of ceramic, which conducts heat well Material, for example made of a high-purity oxide,

Recesses on parts 5 and 6 for the purpose of flush Closing these shells around the parts of the clamps 3 that have passed through,

a one-piece ceramic protective tube, otherwise like parts 5 and 6,

Slots in the tube 8 for the purpose of passing the connecting wires 10 through to the outside,
Connecting wires,

Contact rivets or spot welds for the Wires 10 on the clamps 3

With regard to the manufacture of such a resistor, a few references to manufacturing possibilities are given below. Parts 1 + 8 are expediently manufactured by extrusion. The putty 4 is applied in the form of a stiff slurry after the wire 2_ and possibly the clamps 3. Have been attached to part 1. The excess mass 4_ escapes either laterally when it . 1, the shell is pressed onto its counterpart _5 6_, or it is automatically stripped when It Figure 3 inserted. The carrier tube 1, together with wire and cement compound into the protective tube 8_

—2—

will. Of course, the mass 4 can also be pressed in subsequently after the insertion process has ended. To a sufficiently precise central position of the part IL in the finished resistor and to ensure a uniformly good distribution of the putty compound 4, these operations are expediently carried out using from appropriate devices - after a pre-drying of the mass 4_ the individual parts adhere so tightly to each other that the resistance is unhesitating can be handled, for example, for the purpose of applying a glaze mass, which is not shown in the figures = this surrounds the fully assembled resistor preferably on all sides and after completion of the glaze firing, closes it airtight and moist away.

The parts 5., 6_ and 8 are preferably kept very thin-walled in order to keep the heat build-up along the surfaces of the wires 2_ low when the electrical load on the resistor is high.

The support tube 1 can be stronger and longer than the parts J? and. "Yes or 8_ to facilitate assembly and glaze work.

Compared to conventional wire-wound Y / i resistances, which are only protected against contact by a glaze or / and a cement compound or are protected from the outside, lider resistors according to the innovation have the following advantages. 1.) Very safe and puncture-proof contact protection, too when the wires 2_ are at a relatively high potential against the .. Outside space or if the resistance concerned with his External surface touches parts that carry a high electrical voltage,

2.) relatively high electrical load capacity,

3 ·) Avoid tying up the wires 2_ during assembly, 4.) Saving on glaze mass, since the mentioned final glaze is relieved of static load by the parts 5, and £ or 8 and thus this layer can be kept very thin can, 5 ») Savings in production costs as a result of the simple assembly and the only one burning during this assembly. .

Claims (2)

S t e m a g "Patent - Department Lauf, 3.4.I963 St .. G. 1178 Dr.EL./B. S_c_h_u_t _z_a_n_s_p_r_ü_c_h_e_ 1.) Electrical wire resistor with a ceramic carrier body, characterized by ceramic bodies (5 and 6 or »8) as protection, insulation and heat dissipation body. Beyond the resistance wires (2). 2.) Resistor according to claim 1, characterized by an additional and thin outer glaze almost on all sides = 3) Resistor according to claims 1 or 2, characterized in that that a putty compound (4) both for spacing the winding layers of the wires (2) from one another and for the interim Holds the mentioned parts of the resistor with each other.