Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/02—Bases; Casings; Covers
  • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H37/00—Thermally-actuated switches
  • H01H37/02—Details
  • H01H37/04—Bases; Housings; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/02—Bases; Casings; Covers
  • H01H50/021—Bases; Casings; Covers structurally combining a relay and an electronic component, e.g. varistor, RC circuit

Definitions

• the present invention relates to a bimetal thermostat with a power relay.
• Bimetal thermostats are known which comprise an outer case internally supporting a sensitive thermostatic element connected by means of electric wires to an external power relay adapted to control various external power components.
• Object of the present invention is to provide a thermostat with power relay that is easier to install in equipment for the control of power components.
• this object is achieved with a bimetal thermostat comprising a power relay and a sensitive thermostatic element electrically connected to said power relay, said power relay comprising electric terminals for the connection with external equipment, said bimetal thermostat comprising a supporting case adapted to housing said sensitive thermostatic element, characterised in that the supporting case internally houses said power relay and a plate provided with a printed circuit adapted to form an electrical connection between the power relay and the sensitive element, said case being filled with an insulating resin.
• figure 1 shows a front view of the thermostat according to the present invention
• figure 2 shows a vertical sectional view of the thermostat
• figure 3 shows an exploded view of the thermostat of figure 1
• figure 4 shows the circuitry of the thermostat according to the invention
• figures 5 and 6 show the top and bottom parts of the printed circuit of the plate.
• FIGS 1-6 show a bimetal thermostat according to the present invention.
• the bimetal thermostat comprises an outer case 1 provided at one end with a part 2 having a male thread 21 for coupling with external equipment.
• the part 2 is preferably made of brass and has an internal threaded central cavity 22 adapted to receive a sensitive thermostatic element 3.
• the sensitive element 3 comprises a bulb that is provided with a threaded end 31 to permit a mating connection with the cavity 22 of the part 2 and contains two laminas with a different thermal dilation coefficient (for example, steel and aluminium), rigidly arranged one upon the other, fixed on one side to the bulb and free to move on the other side; the electric contacts or pins 23 are fixed to the ends thereof.
• a different thermal dilation coefficient for example, steel and aluminium
• a plate with a printed circuit 10 for example a vetronite plate, which supports a power relay 4.
• the plate which may be better seen in figures 5 and 6, comprises a printed circuit 100, which is integral with the plate 10 and adapted to electrically connecting the sensitive element 3 to the power relay 4, as well as means for fixing the power relay 4 to said plate 10.
• the plate 10 comprises two metal edged holes 5 for the connection with the metal pins 23 of the sensitive element 3; more precisely, the pins 23 of the sensitive element 3 are welded to the holes
• the power relay is normally welded to the plate 10 by means of pins disposed over metal edged holes 11 of the plate 10.
• the power relay is adapted to work with normal voltages and high levels of current, i.e. with voltages of 12 or 24 Volts and currents on the order of tens of amperes; for example, the relay 4 is capable of working with values of 12
• the cable 702 is used to output the signal originating from the power relay 4 and utilisable by external equipment.
• the printed circuit 100 of the plate 10 has metal edged holes 71, 72 for connecting the electric wires of the power cable 701 and metal edged holes 73, 74 for the connection with the electric wires of the output cable 702; the printed circuit 100 comprises metal strips 75 that link the holes 5 with the holes 11 and other metal strips 75 for the connection of the relay to the cable 702 and of said relay 4 and the sensitive element 3 to the cable 701.
• the plate 10 serves to avoid interferences between the pins 23 of the sensitive element 3, the electrical path for the power supply and the electrical path for the output signal emitted by the power relay 4, a situation that could cause a short circuit of the relay or in any case prevent the relay 4 itself from functioning correctly, with the result that incorrect output signals would be delivered via the signal output electric cable 702.
• An insulating resin 6, e.g. epoxy resin, is applied inside the case 1 to protect the power relay against high temperatures, preferably up to 260°.
• the reduction in manufacturing times combined with the simplicity of the device justifies a substantial reduction in costs.
• the thermostat is of the TCR type, i.e., besides sensing the temperature, upon reaching a predetermined value it causes the switching of an electric contact and the consequent opening or closing of an electric contact.
• This type of thermostat is used to maintain the temperature within the fixed limits or in pneumatic and hydraulic equipment, e.g. heat exchangers, the output signal automatically controls the fluid cooling or heating systems.
• Figure 4 illustrates the circuitry of the above-described thermostat, where 71 and 72 are the power terminals and 73, 74 are the output terminals in the normally closed contact mode, i.e. when the relay 4 is in an energised state, which is in turn a function of the sensitive element 3.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Thermally Actuated Switches (AREA)
• Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40290574

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (1)

Citations (4)

• 2008
  • 2008-01-21 IT ITMI20080018 patent/ITMI20080018U1/it unknown
• 2009
  • 2009-01-05 TR TR2009/00055U patent/TR200900055U/xx unknown
  • 2009-01-12 CN CN200920001529U patent/CN201374014Y/zh not_active Expired - Fee Related
  • 2009-01-14 DK DK200900008U patent/DK200900008U3/da not_active IP Right Cessation
  • 2009-01-15 FI FI20090012U patent/FI8345U1/fi not_active IP Right Cessation
  • 2009-01-15 DE DE200920000443 patent/DE202009000443U1/de not_active Expired - Lifetime
  • 2009-01-16 WO PCT/EP2009/050486 patent/WO2009092668A1/en active Application Filing
  • 2009-01-20 BR BRMU8900094 patent/BRMU8900094U2/pt not_active Application Discontinuation
  • 2009-01-20 ES ES200900086U patent/ES1069559Y/es not_active Expired - Fee Related
  • 2009-01-21 FR FR0950356A patent/FR2926664B3/fr not_active Expired - Fee Related

Patent Citations (4)

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