EA004839B1 - Actuator for controlling fittings - Google Patents

Abstract

1. An actuator for controlling fittings comprising an explosion-protected housing and a pressure-tight separating wall with sealed bushings for electric lines between the inside of the housing and an outer terminal compartment is provided, wherein electrical connections with connection terminals for supply lines are located in said outer terminal compartment, characterized in that a support part (7) which forms the separating wall (6) is provided for the connection terminals (10) and is connected to pin-like extensions (11), said pin-like extensions penetrate the separating wall (6) and plug-in contact elements (12) are provided at the inner end of said pin-like extensions (11), for contacting with mating plug-in contact elements (13). 2. The actuator for controlling fittings according to claim 1, characterized in that the support element (7) is inserted into a main frame member (8) shaped as a pipe, which is inserted as an embedded piece between the housing (2) and an outer closing lid (9) limiting the compartment (5) for connection of supply lines. 3. The actuator for controlling fittings according to claim 1 or 2, characterized in that the support element (7) is designed as a die casting plastic piece and due to such forming is tightly connected to the main frame member (8) and that the connections (10) to terminals with the plug-in contact elements (12) on pin-like extensions (11) provided between them are fit securely into the support element (7). 4. The actuator for controlling fittings according to any one of claims 1-3, characterized in that the main frame member (8) is made of metal, preferably of aluminum by die casting which at its connection ends is provided with connection flanges having receiving compartments for sealing means. 5. The actuator for controlling fittings according to any one of claims 1-4, characterized in that a holder (14) is provided for the mating plug-in contact elements (13), the holder is provided with receiving cavities (25) located in coordination with the plug-in contact elements (12) of the support element (7) for arranging therein the mating plug-in contact elements (13). 6. The actuator for controlling fittings according to claim 5, characterized in that the main frame member (8) and the holder (14) are provided with guides for proper elements joining, and preferably at least one groove (15) is provided in the main frame member (8) and a projection (10) respectively on the holder (14). 7. The actuator for controlling fittings according to claim 5 or 6, characterized in that at least one fixing element is provided on the main frame element (8) in the axial direction for fixing the holder (14) for the mating plug-in contact elements (13), the fixing element is preferably an annular groove comprising a fixing ring (18). 8. The actuator for controlling fittings according to any one of claims 1-7, characterized in that the plug-in contact elements (12) of the support element (7) are located in groups biased relative each other planes, and the mating plug-in contact elements (13) of the holder (14) are located in planes biased relative to each other in a supplemented manner. 9. The actuator for controlling fittings according to any one of claims 1-8, characterized in that the plug-in contact elements (12) of the support element (7) are sockets and the mating plug-in contact elements (13) of the holder (14) are plugs. 10. The actuator for controlling fittings according to any one of claims 1-9, characterized in that the support element (7) and the holder (14) are adapted to input a plurality of the plug-in contact elements (12) and the mating plug-in contact elements (13), for example, more than 40 contact elements correspondingly. 11. The actuator for controlling fittings according to any one of claims 1-10, characterized in that the main frame element (8), the support element (7), the pin-like extensions (11) are made of a material having about similar thermal extension coefficient. 12. The actuator for controlling fittings according to any one of claims 1-11, characterized in that annular elements mating with each other geometrically in the form of annular grooves and projections are provided in the connection zone between the main frame element (8) and the support element (7). 13. The actuator for controlling fittings according to any one of claims 1-12, characterized in that an elastic sealing, preferably in the form of at least one ring (20) of circular section is provided for particular tight sealing provided in the connection zone between the main frame element (8) and the support element (7). 14. The actuator for controlling fittings according to any one of claims 1-13, characterized in that the pin-like extensions (11) are provided with annular grooves (22) or other similar configurations, if necessary, with corrugation for increasing surface area.

Description

The invention relates to a servodrive for valves with an explosion-proof housing, with a sealed partition wall with sealed leads for electrical wires between the internal cavity of the housing and the external cavity for connecting the wires, and electrical connections with connections to the terminals for connecting the wires are provided in the external cavity. connecting wires.

Devices like servos for valves are manufactured, including, in an explosion-proof housing. To do this, the internal cavity of the device must be properly sealed. Externally supplied power and control wires must accordingly be introduced into the internal cavity through hermetically sealed glands for electrical wires.

It is known that the wires are introduced through the gland entry, which is screwed into the partition between the outer area and the explosion-proof internal cavity and fixed by means of a liquid sealer.

In the external area there are contact clips to which external connecting wires can be connected and to which the supply and control wires passing through the sealing gland into the internal cavity of the housing are also connected.

When disassembling with the opening of the case, it is required to disconnect the cables and after replacing the unit block, then reconnect. However, installation errors cannot be excluded. In addition, the cost of installation is relatively high, and requires a significant investment of time.

The object of the present invention is to provide an electrical connection in the actuator for valves of the aforementioned type, through which simplified installation is possible at reduced costs, while simple maintenance and disassembly are possible during maintenance, and installation errors are virtually eliminated.

To solve this problem, there is a supporting element that forms a partition wall for connections to the contact terminals that are connected to the pin extension and pass through the separation partition, and there are elements of a contact connector for contacting the counterpart elements of the contact connector for the inner end of the pin extension.

At the same time, the dividing wall forms at the same time a supporting element for connections to the contact clips, which are connected directly to the elements of the contact detachable connection through the pin extensions. This forms a compact connection block. Due to the contact detachable connections between the electrical wires connected to the built-in parts and the connections to the terminal clamps, installation is greatly simplified, and in the case of maintenance, the replacement of entire units can be done quickly, without the cost of disconnecting and reconnecting the wires, by switching contacts.

Especially preferred is if there is a holder for the elements of the counterpart of the detachable connector, which has receiving receptacles for the elements of the counterpart of the detachable connector that are placed in coordination with the elements of the detachable connector for the support element.

Installation errors during installation and after replacement of the unit block are thus practically excluded, so that similar work can be carried out by less qualified personnel.

The preferred form of implementation provides that the support element is hermetically inserted into the main frame structure in the form of a pipe as an integral part between the housing and the external closing lid, limiting the cavity for connecting the wires. This basic frame structure allows for easy pre-assembly and connection with a support element hermetically inserted into it.

It is preferable to provide that the support element is made of a plastic part made by injection molding and due to such molding is associated with the main frame structure, and that the pin extensions that connect the connections to the contact terminals with the elements of the contact plug connection are molded tightly into the support element.

It is in this form of implementation that it is preferable to use the main tube-shaped frame structure, because there is good accessibility and manipulability for the molding process. For manufacturing, before the process of extrusion or pouring, the connections to the contact clips with pin extensions and having contacts of the contact detachable connection are laid in the mold for injection molding and during the extrusion process are directly co-molded, so that on one side of the separation partition clamps, and on the other side to the elements of the plug connector. The main frame construction with the molded support element with contacts embedded in it forms, after curing the formable mass, an integral unit. In particular, thermosetting epoxy-based plastics are used as moldable materials.

The preferred way, the elements of the contact detachable connection of the support element are placed individually or in groups in offset planes relative to each other, and the elements of the counterpart of the detachable contact connection of the holder are placed in complementaryly displaced planes. Thus, the connections to the contact terminals located on the outer ends of the elements of the contact detachable connection are placed in different planes. With a given cross section on the lumen of the main frame structure in the form of a pipe, an increase in the distance between adjacent contacts or connection points is thus achieved, so that under constrained conditions and a large number of contacts, prescribed air gaps and gaps due to leakage currents can be maintained.

Additional embodiments of the invention are described in the subsequent dependent clauses.

Below the invention with its essential features are described in detail with reference to the drawings, which represent the following:

FIG. 1 is a view in longitudinal section of a fragment of the actuator for valves;

FIG. 2 is a rear view of the main frame structure with a support member and connections to the contact terminals; and FIG. 3 is an enlarged view in longitudinal section in the zone of the main frame structure with a supporting element for contacts.

In the exemplary embodiment of FIG. 1 shows a part of the servo drive 1 for valves, for which the electronics housing part 2, as well as the housing compartment 3 with electrical connections, in particular, are shown in longitudinal section 4. The housing part 2 is made in an explosion-proof version and hermetically sealed in relation to the external environment. Between the inner cavity of this part of the housing and the outer cavity 5 for connecting wires, a sealed partition wall 6 is provided, which simultaneously forms the supporting element 7 for electrical connections 4.

The supporting element 7 is inserted into the main frame structure 8 in the form of a pipe, which is placed in the form of a built-in structure between the housing part 2 and the external closing cover 9, which bounds the external cavity 5 for connecting the wires. FIG. 3, this basic frame construction 8 is shown enlarged together with the closing cover 9 shown in phantom line. It is clearly seen that the supporting element 7 has 10 connections to the contact clamps that are connected to the pin extensions 11 that are accessible from the outside with the closing cover 9 removed. and with their help pass through the partition wall 6 or, respectively, the supporting element 7. At the inner end of the pin extension cords 11 are provided the elements of the 12-pin detachable connection, which in this example re implementation made in the form of sockets.

Pin extensions 11 throughout their longitudinal length are massive and at one end pass into the slots, and at the other end have a screw thread for connecting 10 to the contact terminals. In general, these contact elements are made as one unit.

The elements 13 of the mating part of the contact plug-in connection in the form of plugs are placed in the holder 14 and are held by it in such a way that they are coaxial with the elements of the 12-pin plug-in connection. In addition, on the main frame structure 8 and on the holder 14, guides are provided for the correct joining of these elements. In the exemplary embodiment under consideration, a groove 15 is provided for this in the main frame structure, and a protrusion 16 corresponding to it is provided in the holder. Thus, an unambiguous orientation in position is set, so that the holder with elements 13 of the counterpart of the detachable plug connection approaches the support element only in a suitable position 7 with elements 12 pin detachable connections, and then the contact elements can dock. Due to this, erroneous connections are excluded.

The holder 14 is preferably embodied as an injection molded plastic part. For receiving the response elements of the detachable connector, the holder 14 has slots 25, into which, after insertion, the elements 13 of the counterpart of the detachable connector are installed.

In the embodiment shown in FIG. 1 and 3 of the mounting position in which the electrical plug-in connectors are articulated with each other, the holder 14 is fixed axially with a retaining ring 18 which fits into the annular groove 17.

Made in the form of plugs elements of the mating part of the plug connector are located inside the receiving cavities of the holder 14 and are fixed in them in the axial direction. Electrical conductors 19 are connected to elements 13 of the mating part of the contact plug-in connection, which inside the body part 2 lead to the corresponding nodes (Fig. 1).

As already mentioned, the support element 7, which also forms the partition wall 6 at the same time, is tightly connected to the main frame structure in the form of a pipe or sleeve. This is achieved by the fact that the supporting element 7 is made by injecting material into the main frame structure 8. Thermosetting epoxy-based plastics are preferably used as the material. The injection process occurs at an elevated temperature, for example, about 180 °. Contacts, i.e. The connections 10 to the contact clips with the elements 12 of the contact detachable connection and with the pin extensions 11 connecting them during the molding process are pressed, and the connections 10 to the contact clips protrude on the outside and the elements of the contact detachable connection on the inside. In this way, only the pin extensions are embedded in the support element itself.

eleven.

The casting mass used is chosen so that it has a coefficient of thermal expansion consistent with the metal main frame structure 8 and with metal pin extenders 11. However, in order to achieve a reliable hermetic seal under almost all conditions, in the joint zone between the main frame structure 8 and a resilient seal is introduced into the supporting element 7, in the exemplary embodiment in the form of an o-ring 20 (FIG. 3). In addition, circular profiling 21 in the form of annular grooves and protrusions articulated with each other with a geometric closure is provided in this zone. Thus, the supporting element 7 is additionally fixed in the axial direction.

The pin elongations 11, as shown in FIG. 3, are provided with annular grooves 22 or other similar profiles, in the necessary case also corrugations to increase the surface area in order to achieve a better seal.

As clearly seen in FIG. 1 and 3, the connections 10 to the contact terminals are arranged in groups in mutually offset planes. In an embodiment, three offset planes are provided. And located on the inner side, connected with the connections 10 to the contact terminals, the elements 12 of the contact detachable connection are displaced in accordance with the connections 10 to the contact terminals, and consistently with this, the elements 13 of the counterpart of the contact detachable connection, which are fixed in the holder 14. Step arrangement in several step planes ensures, with a compact design, compliance with prescribed air gaps and gaps due to leakage currents, even when radially Tel'nykh small distances between the individual contacts in E. Thus, in a relatively small space, a plurality of electrical contacts can be positioned with connections 10 to contact terminals, and in the present embodiment 42 such connections to contact terminals are provided (Fig. 2).

Separate connections 10 to the terminals are shielded from each other by bounding partitions 26.

It should also be noted that the main frame structure 8 consists of metal, preferably cast from aluminum. It has at its ends corresponding connecting flanges 23, 24 through which connections are possible, on the one hand, with part 2 of the housing, and on the other hand, with a closing cover 9. In the area of these connections, seals in the form of o-rings are also provided.

Claims (14)

CLAIM 1. A servo drive for valves with explosion-proof housing, and between the internal cavity of the housing and the external cavity for connecting wires there is a sealed dividing wall with sealed bushings for electrical wires, and in the external cavity for connecting wires there are electrical connections with connections to contact clamps for connecting wires, characterized in that a support element (7) forming a dividing wall (6) is provided for connecting (10) to the contact terminals imams that are connected to the pin extenders (11) and pass through them through the dividing wall (6), and on the inner end of the pin extensions (11) are provided contact plug elements (12) for contacting with the elements (13) of the contact part of the contact detachable connection . 2. The actuator for valves according to claim 1, characterized in that the supporting element (7) is inserted into the main frame structure (8) in the form of a pipe, which is inserted as an integrated part between the housing (2) and the external closing cover (9), which limits cavity (5) for connecting wires. 3. The actuator for valves according to claim 1 or 2, characterized in that the supporting element (7) is made in the form of a plastic part made by injection molding, and due to such molding, is hermetically connected to the main frame structure (8), and that the connections (10) to the contact clamps with the elements (12) of the contact detachable connection on the pin extensions (11) located between them, due to molding, are tightly sealed in the support element (7). 4. A servo drive for valves according to any one of claims 1 to 3, characterized in that the main frame structure (8) is made of metal, preferably it is an aluminum part made by injection molding, which at its connecting ends has connecting flanges with receiving cavities for sealing agent. 5. A servo drive for valves according to any one of claims 1 to 4, characterized in that a holder (14) is provided for elements (13) of the mating part of the contact detachable connection, which has a support element (7) arranged in coordination with the elements (12) of the contact detachable connection ) receiving cavities (25) for the elements (13) of the reciprocal part of the contact detachable connection installed therein. 6. A servo drive for valves according to claim 5, characterized in that the main frame structure (8) and the holder (14) have guides for the parts to fit correctly in position, and preferably at least one groove is provided in the main frame structure (8) ( 15), and on the holder (14) there is a protrusion (16) coordinated with it. 7. A servo drive for valves according to claim 5 or 6, characterized in that at least one locking element is provided for axially securing the position of the holder (14) for the elements (13) of the mating connector in the axial direction on the main frame structure (8) , preferably an annular groove (17) into which the retaining ring (18) enters. 8. A servo drive for valves according to any one of claims 1 to 7, characterized in that the elements (12) of the contact detachable connection of the support element (7) are located, in particular, in groups in planes offset relative to each other, and the elements (13) of the counterpart contact detachable holder (14) are placed in planes offset relative to each other in a complementary way. 9. The actuator for valves according to any one of claims 1 to 8, characterized in that the elements (12) of the contact detachable connection of the support element FIG. 1 that (7) are sockets, and the elements (13) of the mating part of the contact detachable connection of the holder (14) are plugs inserted into them. 10. A servo drive for valves according to any one of claims 1 to 9, characterized in that the support element (7) and the holder (14) are configured to insert a plurality of elements (12) of the contact detachable connection and elements (13) of the contact part of the contact detachable connections, for example, more than 40 contact elements, respectively. 11. A servo drive for valves according to any one of claims 1 to 10, characterized in that the material for the main frame structure (8), the material for the supporting element (7) pressed into it, as well as the material for the pin extensions embedded in the supporting element (11) ) have a coefficient of thermal expansion that is consistent with each other. 12. A servo drive for valves according to any one of claims 1 to 11, characterized in that, in the connection zone between the main frame structure (8) and the supporting element (7), in particular, circular profiled joints with each other with a geometric locking profiling (21 ), preferably in the form of annular grooves and protrusions. 13. A servo-drive for valves according to any one of claims 1-12, characterized in that for a particularly tight seal in the connection zone between the main frame structure (8) and the supporting element (7) an elastic seal is provided, preferably in the form of at least one ring (20) round section. 14. A servo-drive for valves according to any one of claims 1 to 13, characterized in that the pin extensions (11) are provided with annular grooves (22) or other similar profiling, if necessary, corrugations to increase the surface area.