Pressure trip unit for an electrical switch and electrical switch with such a pressure trip unit

Patent metadata

Field	Value
Publication number	US-10971316-B2
Application number	US-201816050115-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 1, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A pressure trip unit for an electrical switch, including an actuating element and at least one flow channel per electrical pole, is disclosed. In an embodiment, the at least one pole of the electrical switch includes at least two switching contacts for making or disconnecting a flow path. The switching contacts of the at least one pole of the electrical switch are disconnectable via the actuating element which can respond to a pressure generated in a disconnection zone of the, in each case, two switching contacts by an electric arc drawn in the event of an electrodynamic recoil of the switching contacts. Further, the disconnection zone is connectable to the actuating element via the flow channel, the at least one flow channel including a nonreturn valve to permit a flow only from the disconnection zone in the direction of the actuating element.

First claim

What is claimed is:

1. A pressure trip unit for an electrical switch, comprising:
an actuating element;
at least one flow channel, each at least one flow channel respectively corresponding to each of at least one electrical pole of the electrical switch,
wherein each at least one pole of the electrical switch includes at least two switching contacts for making or disconnecting a flow path,
wherein the at least two switching contacts of each at least one pole of the electrical switch are disconnectable via the actuating element, the actuating element being configured to respond to a pressure generated in a disconnection zone of each respective switching contact of the at least two switching contacts by an electric arc drawn in an event of an electrodynamic recoil of each of the at least two switching contacts,
wherein the disconnection zone of each respective switching contact is connectable to the actuating element via the at least one flow channel, the at least one flow channel including a non-return valve to permit a flow only from the disconnection zone in a direction of the actuating element, and
wherein the non-return valve of the at least one flow channel includes a tongue, the tongue, in an inoperative state, covering the at least one flow channel and the tongue, in an event of pressure in an associated disconnection zone, being configured to open up the at least one flow channel; and

a housing, including a first housing part and a second housing part, the tongue being held between the first housing part and the second housing part, and the tongue being manufactured from aramid, wherein a response behavior of the non-return valve is set by at least one of an angle and a bending radius of a holding zone of the tongue of the first housing part and the second housing part.

2. The pressure trip unit of claim 1 , wherein the electrical switch is a multi-pole electrical switch, wherein the at least one pole of the multi-pole electrical switch includes a plurality of poles, and wherein the non-return valve of the at least one flow channel of the multi-pole electrical switch is configured to prevent a flow from one disconnection zone to another disconnection zone of the plurality of poles of the electrical switch.

3. The pressure trip unit of claim 2 , further comprising:
a common collecting chamber, wherein the at least one flow channel includes a plurality of flow channels and wherein the non-return valve includes a plurality of non-return valves, the common collecting chamber being arranged between the non-return valves and the actuating element, wherein the common collecting chamber is arranged in terms of flow at an output of the non-return valves.

4. The pressure trip unit of claim 2 , wherein the actuating element is designed as a tappet.

5. The pressure trip unit of claim 2 , wherein the pressure trip unit is constructed modularly from
at least two valve elements, each respective valve element of the at least two valve elements including a respective non-return valve and a respective flow channel; and
a tripping element including the actuating element, the at least two valve elements and the tripping element being designed to be pluggable together.

6. An electrical switch, comprising:
a plurality of poles; and
the pressure trip unit of claim 2 ,
wherein each of the plurality of poles of the electrical switch comprise at least two switching contacts to make the flow path or disconnect the flow path,
wherein the at least two switching contacts of the plurality of poles of the electrical switch are disconnected via the actuating element responding to the pressure generated in the disconnection zone of at least one of the at least two switching contacts by the electric arc drawn in the event of the electrodynamic recoil of the at least two switching contacts,
wherein the at least one flow channel of the pressure trip unit includes at least two flow channels, each respective flow channel of the at least two flow channels corresponding to each respective pole of the plurality of poles of the electrical switch, and
wherein respective disconnection zones of the at least two switching contacts are connected to the actuating element via the at least two flow channels.

7. The pressure trip unit of claim 1 , wherein the response behavior of the non-return valve is set by a material thickness of the tongue or by a rigidity of the material.

8. The pressure trip unit of claim 1 , wherein the actuating element is designed as a tappet.

9. The pressure trip unit of claim 8 , wherein the tappet is held in an inoperative position by a spring and is actuatable, in an event of pressure, counter to a spring force of the spring.

10. An electrical switch, comprising:
a plurality of poles; and
the pressure trip unit of claim 1 ,
wherein each of the plurality of poles of the electrical switch comprise at least two switching contacts to make the flow path or disconnect the flow path,
wherein the at least two switching contacts of the plurality of poles of the electrical switch are disconnected via the actuating element responding to the pressure generated in the disconnection zone of at least one of the at least two switching contacts by the electric arc drawn in the event of the electrodynamic recoil of the at least two switching contacts,
wherein the at least one flow channel of the pressure trip unit includes at least two flow channels, each respective flow channel of the at least two flow channels corresponding to each respective pole of the plurality of poles of the electrical switch, and
wherein respective disconnection zones of the at least two switching contacts are connected to the actuating element via the at least two flow channels.

11. The electrical switch of claim 10 , wherein the electrical switch comprises two or three electrical poles, and wherein the pressure trip unit comprises three or four flow channels.

12. The electrical switch of claim 10 , wherein the electrical switch further comprises a protective barrier to prevent direct transport of particles from the disconnection zone to the pressure trip unit.

13. A pressure trip unit for an electrical switch, comprising:
an actuating element;
at least one flow channel, each at least one flow channel respectively corresponding to each of at least one electrical pole of the electrical switch,
wherein each at least one pole of the electrical switch includes at least two switching contacts for making or disconnecting a flow path,
wherein the at least two switching contacts of each at least one pole of the electrical switch are disconnectable via the actuating element, the actuating element being configured to respond to a pressure generated in a disconnection zone of each respective switching contact of the at least two switching contacts by an electric arc drawn in an event of an electrodynamic recoil of each of the at least two switching contacts,
wherein the disconnection zone of each respective switching contact is connectable to the actuating element via the at least one flow channel, the at least one flow channel including a non-return valve to permit a flow only from the disconnection zone in a direction of the actuating element, and
wherein the non-return valve of the at least one flow channel includes a tongue, the tongue, in an inoperative state, covering the at least one flow channel and the tongue, in an event of pressure in an associated disconnection zone, being configured to open up the at least one flow channel; and
a housing, including a first housing part and a second housing part, the tongue being held between the first housing part and the second housing part, and t

Assignees

• Siemens Ag

Inventors

• Andersen Oliver
• Biedunkiewicz Pawel
• Dahl Joerg-Uwe
• Deylitz Erhard

Classifications

• H01H9/342 Primary

  Venting arrangements for arc chutes · CPC title

• H01H33/42 Primary

  Driving mechanisms · CPC title

• H01H2077/025

  with pneumatic means, e.g. by arc pressure · CPC title

• H01H33/82

  the fluid being air or gas · CPC title

• H01H2071/2427

  with blow-off movement tripping mechanism, e.g. electrodynamic effect on contacts trips the traditional trip device before it can unlatch the spring mechanism by itself · CPC title