Moving contact assembly for DC contactor

Abstract

The present invention discloses a moving contact assembly for a DC contactor, comprising a push rod, a gasket, a spring and a moving contact, wherein the top fixing sleeve of the push rod is provided with an upper limit piece and the middle fixing sleeve is provided with a lower support piece, and the upper side surface of the lower support piece, i.e., the support surface, is provided with a pair of locking protrusions symmetrical with respect to the axis of the push rod; the center of the gasket is provided with a central slot hole and the two sides are symmetrically provided with side limit slot holes; the center of the moving contact is provided with a mounting hole, and the moving contact, spring and gasket are sequentially installed between the upper limit piece and the lower support surface of the push rod to form a reliable and stable connection. The moving contact assembly for a DC contactor reduces the number of parts, improves assembly efficiency and product precision, and also improves product safety and reliability by providing the upper limit piece and the lower support piece on the push rod.

Description

Technical Field

[0001] The invention relates to a moving contact assembly, in particular to a moving contact assembly for a DC contactor. Background Art

[0002] The common DC contactor moving contact assemblies on the market are usually made of conductive but non-magnetic stainless steel rod materials. Some manufacturers use upper and lower gaskets and upper and lower sleeves plus retaining springs to limit the moving contacts and springs to form moving contact assemblies. This method has defects such as a large number of parts, high cost, low assembly efficiency, and poor reliability. Some manufacturers omit the upper and lower sleeves and retaining springs and use top welding or riveting to fix the moving contact assemblies. Although the number of parts is reduced, the insulation between the main circuit and the control circuit is reduced, posing a safety hazard. At the same time, the processing difficulty is increased, the accuracy is difficult to guarantee, and the production efficiency is not high. Summary of the invention

[0003] In order to overcome the above defects, the present invention provides a moving contact assembly for a DC contactor, which not only reduces the number of parts, improves assembly efficiency and product precision, but also improves product safety and reliability.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a moving contact assembly for a DC contactor, including a push rod, a gasket, a spring and a moving contact, the top fixing sleeve of the push rod is provided with an upper limit piece and the middle fixing sleeve is provided with a lower support piece, the upper side surface of the lower support piece, i.e., the support surface, is provided with a pair of locking protrusions symmetrical with respect to the axis of the push rod; the center of the gasket is provided with a central slot hole consistent with the shape of the lower support piece, and the two sides of the central slot hole in the width direction are symmetrically provided with side limit slot holes for accommodating the locking protrusions, and the two side limit slot holes are connected to the central slot hole as a whole; the center of the moving contact is provided with a spring which is symmetrical with respect to the lower support piece. The movable contact passes through the mounting hole and the lower support of the push rod to be inserted into the upper end of the push rod, and the upper side surface of the movable contact is pressed against the upper limit piece of the push rod; the spring passes through the lower support of the push rod through its center through hole and is inserted into the upper end of the push rod, and the upper end surface of the spring elastically presses against the lower side surface of the moving contact; the gasket passes through the lower support of the push rod through the center slot and is inserted into the upper end of the push rod, and is rotated 90° to be fixed between the spring and the lower support, and the two locking protrusions on the lower support are respectively clamped in the two side limit slots of the gasket.

[0005] As a further improvement of the present invention, a plurality of reinforcing ribs are provided between the edge of the upper side surface of the upper limit member and the end portion of the upper end of the push rod.

[0006] As a further improvement of the present invention, the upper limit member is circular and the lower support member is square.

[0007] As a further improvement of the present invention, the diameter of the upper limit member is greater than the length of the lower support member.

[0008] As a further improvement of the present invention, the diameter of the push rod at a portion below the lower support member is smaller than that of the push rod at a portion above the lower support member.

[0009] As a further improvement of the present invention, the gasket is a circular gasket, and the outer edge of the circular gasket is folded outward to form a flange.

[0010] As a further improvement of the present invention, the inner diameter of the spring and the outer diameter of the spring are smaller than the distance between the center of the gasket and its flange.

[0011] As a further improvement of the present invention, the gasket is made of stainless steel.

[0012] As a further improvement of the present invention, a transition arc groove is provided between the two side limit slot holes and the central slot hole of the gasket.

[0013] As a further improvement of the present invention, the top of the push rod, the upper limit piece and the lower support piece are made of plastic material.

[0014] The beneficial effects of the present invention are as follows: the moving contact assembly for the DC contactor is provided with an upper limit member and a lower support member on the push rod, and the moving contact, spring and gasket are installed therein, thereby reducing the number of parts, improving assembly efficiency and product precision, and also improving product safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the push rod structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the gasket structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the assembly state of the spring and the push rod of the present invention;

[0019] Figure 5 This is a schematic diagram of the assembly state of the spring and gasket of the present invention;

[0020] Figure 6 This is a schematic diagram of the structure of the moving contact of the present invention;

[0021] Figure 7 This is a schematic diagram of the assembly step 1 of the present invention;

[0022] Figure 8 This is a schematic diagram of the assembly step 2 of the present invention;

[0023] Fig. 9 The state diagram of the assembly step 3 of the present invention is shown in FIG. Figure 1 ;

[0024] Fig.10 The state diagram of the assembly step 3 of the present invention is shown in FIG. Figure 2 .

[0025] Combined with the accompanying drawings, the following description is given:

[0026] 1——Push rod; 2——Gasket;

[0027] 3——spring; 4——moving contact;

[0028] 11——Upper limit piece; 12——Lower support piece;

[0029] 121——support surface; 122——locking protrusion;

[0030] 13——Reinforcement rib; 21——Center slot;

[0031] 22——Side limit slot; 23——Flange;

[0032] 24——arc groove; 111——limiting surface;

[0033] 41——Mounting hole. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] See also Figure 1 , is a moving contact assembly for a DC contactor according to the present invention, comprising a push rod 1, a gasket 2, a spring 3 and a moving contact 4.

[0036] See also Figure 2 The top fixed sleeve of the push rod 1 is provided with a circular upper limit piece 11 and the middle fixed sleeve is provided with a square lower support piece 12, so as to install the moving contact 4, the spring 3 and the gasket 2 therein. A plurality of reinforcing ribs 13 are provided between the edge of the upper side of the upper limit piece 11 and the end of the upper end of the push rod 1, and a pair of locking protrusions 122 symmetrically relative to the axis of the push rod are provided on the upper side, i.e., the support surface 121, of the lower support piece 12.

[0037] The top of the push rod 1 has the function of reliably limiting the moving contact. During the frequent movement of the contact piece, the lower side surface of the upper limit member 11 at the top of the push rod, namely the limiting surface 111, and the upper side surface of the lower support member 12, namely the supporting surface 121, are subjected to the greatest impact, and therefore require sufficient supporting strength. The reinforcing ribs 13 evenly distributed on the top of the push rod provide sufficient strength for the top limiting surface, and the locking protrusion at the bottom provides sufficient strength for the supporting surface, thereby ensuring the functionality and reliability of the moving contact assembly of the contactor throughout its entire life cycle.

[0038] The diameter of the limiting circular surface of the upper limit member 11 at the top of the push rod 1 is larger than the diameter of the supporting surface of the lower support member 12 at the bottom, which can reliably limit the axial position of the moving contact. The diameter of the cylinder in the middle of the push rod is slightly smaller than the middle diameter of the moving contact, ensuring smooth axial movement of the moving contact.

[0039] See also Figure 3 , the gasket 2 is a circular gasket, the outer edge of which is folded outward to form a flange 23. The center of the gasket 2 is provided with a central slot 21 that is consistent with the shape of the lower support 12, that is, a square slot. The two sides of the central slot in the width direction are symmetrically provided with side limit slots 22 for accommodating the locking protrusion 122. The two side limit slots 22 are connected to the central slot 21 as a whole; a transition arc groove 24 is provided between the two side limit slots 22 of the gasket 2 and the central slot 21. The middle slot of the gasket 2 cooperates with the corresponding structure of the push rod to prevent the gasket from falling due to rotation during frequent actions, which may cause the product to fail. The flange on the outer edge of the gasket not only increases the strength of the gasket and is not easy to deform, but also limits the spring position to always remain in the middle position without tilting, so that the spring force is uniform. The gasket 2 is made of stainless steel, is non-magnetic, and will not affect the action characteristics of the product.

[0040] See also Figure 4 , the inner diameter of the spring and the outer circle of the bottom of the push rod have a clearance match, which is convenient for installation. Figure 5 The outer diameter of the spring and the inner diameter of the gasket flange are matched to facilitate installation while ensuring a certain limit.

[0041] See also Figure 6 A mounting hole 41 is provided at the center of the moving contact, which is consistent with the shape of the lower support member 12 of the push rod and matches the clearance of the push rod, making it easy to install and ensuring the smooth axial movement of the moving contact.

[0042] In addition, the top of the push rod, the upper limit piece and the lower support piece are made of plastic material, and the bottom is made of metal material. The bottom can be embedded in the top, thereby reducing the manufacturing cost.

[0043] The assembly steps of the moving contact assembly for the DC contactor are as follows:

[0044] Step 1: First, install the moving contact 4 on the push rod 1. The moving contact 4 passes through the bottom plate of the push rod 1 through the mounting hole 41, that is, passes through the lower support member 12 and is inserted into the upper end of the push rod 1. The upper side of the moving contact is pressed against the limit surface 111 of the upper limit member 11 of the push rod. Figure 7 ;

[0045] Step 2, install the spring 3, also from the bottom plate of the push rod, that is, the spring 3 passes through the central through hole of the push rod and is inserted into the upper end of the push rod 1, and the upper end surface of the spring 3 elastically presses against the lower side surface of the moving contact 4, see Figure 8 ;

[0046] Step 3, insert the gasket 2, which passes through the central slot 21 through the lower support member 12 of the push rod and is inserted into the upper end of the push rod 1, and is rotated 90 degrees to be fixed between the spring 3 and the lower support member 12, and the two locking protrusions 122 on the lower support member 12 are respectively clamped in the two side limit slots 22 of the gasket 2, see Figure 9-10 , thereby completing the installation and obtaining the moving contact assembly for the DC contactor of the present invention, see the attached Figure 1 .

[0047] It can be seen that the moving contact assembly for the DC contactor reduces the number of parts, improves assembly efficiency and product precision, and also improves product safety and reliability by providing an upper limit member and a lower support member on the push rod, and installing the moving contact, spring and gasket therein.

[0048] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A moving contact assembly for a DC contactor, characterized in that: The invention comprises a push rod (1), a gasket (2), a spring (3) and a moving contact (4), wherein the top fixing sleeve of the push rod (1) is provided with an upper limit piece (11) and the middle fixing sleeve is provided with a lower support piece (12), and the upper side surface of the lower support piece, i.e., the support surface (121), is provided with a pair of locking protrusions (122) symmetrical with respect to the axis of the push rod; the center of the gasket (2) is provided with a central slot hole (21) which is consistent with the shape of the lower support piece (12), and the two sides of the central slot hole in the width direction are symmetrically provided with side limit slot holes (22) for accommodating the locking protrusions (122), and the two side limit slot holes (22) are connected to the central slot hole (21) as a whole; the center of the moving contact (4) is provided with a mounting hole (41) which is consistent with the shape of the lower support piece (12), and the moving contact (4 ) passes through the mounting hole (41) through the lower support member (12) of the push rod and is inserted into the upper end of the push rod (1), and the upper side surface of the moving contact is pressed against the upper limit member (11) of the push rod; the spring (3) passes through the lower support member (12) of the push rod through its central through hole and is inserted into the upper end of the push rod (1), and the upper end surface of the spring (3) is elastically pressed against the lower side surface of the moving contact (4); the gasket (2) passes through the lower support member (12) of the push rod through the central slot hole (21) and is inserted into the upper end of the push rod (1), and is rotated 90° to be fixed between the spring (3) and the lower support member (12), and the two locking protrusions (122) on the lower support member (12) are respectively clamped in the two side limit slot holes (22) of the gasket (2).

2. The moving contact assembly for a DC contactor according to claim 1, characterized in that: A plurality of reinforcing ribs (13) are provided between the edge of the upper side surface of the upper limit member (11) and the end of the upper end of the push rod (1).

3. The moving contact assembly for a DC contactor according to claim 2, characterized in that: The upper limit member (11) is circular, and the lower support member (12) is square.

4. The moving contact assembly for a DC contactor according to claim 3, characterized in that: The diameter of the upper positioning member (11) is greater than the length of the lower supporting member (12).

5. The moving contact assembly for a DC contactor according to claim 1, characterized in that: The diameter of the push rod at a portion below the lower support member is smaller than that of the push rod at a portion above the lower support member.

6. The moving contact assembly for a DC contactor according to claim 1, characterized in that: The gasket (2) is a circular gasket, the outer edge of which is folded outwards to form a flange (23).

7. The moving contact assembly for a DC contactor according to claim 6, characterized in that: The inner diameter of the spring and the outer diameter of the spring are smaller than the distance between the center of the gasket and its flange.

8. The moving contact assembly for a DC contactor according to claim 6, characterized in that: The gasket (2) is made of stainless steel.

9. The moving contact assembly for a DC contactor according to claim 6, characterized in that: A transition arc groove (24) is provided between the two side limit slot holes (22) and the central slot hole (21) of the gasket.

10. The moving contact assembly for a DC contactor according to claim 1, characterized in that: The top of the push rod, the upper limit piece and the lower support piece are made of plastic material.

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