High-voltage DC relay with auxiliary contact

Abstract

The application discloses a high-voltage direct-current relay with auxiliary contact, which comprises two static contacts, a moving contact, a push rod, a coil assembly, a moving iron core and an auxiliary contact. The moving iron core is movably arranged in the coil assembly and is fixedly connected with the push rod. The moving contact is movably connected with the push rod and cooperates with the two static contacts. The auxiliary contact comprises two auxiliary spring sheets arranged in the coil assembly, and the two auxiliary spring sheets are respectively provided with leading ends. The push rod has an insulating part and a conductive part arranged in an up-down manner. With the up-down movement of the push rod, the two auxiliary spring sheets clamp the conductive part or the insulating part of the push rod to realize the on-off of the auxiliary contact. The application can not only realize the monitoring function of the auxiliary contact by the cooperation of the two auxiliary spring sheets and the push rod, but also can offset the rebound force of the moving contact when the moving contact is released by the contact friction force of the two auxiliary spring sheets and the conductive part or the insulating part of the push rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of relays, in particular to a high-voltage DC relay with auxiliary contact. BACKGROUND

[0002] A relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit), which is usually applied in an automatic control circuit. It is actually a kind of "automatic switch" that uses a small current to control a large current. Therefore, it plays a role in automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] A high-voltage DC relay is a kind of relay. The high-voltage DC relay of the prior art generally includes a relay housing, two static contact moving contact pieces, a push rod, a moving iron core, a coil assembly, a counter-force spring for resetting the moving iron core, and a contact spring for increasing the contact pressure, etc. When the coil assembly works, the moving iron core moves, and the moving contact pieces are moved by the push rod to make the two ends of the moving contact pieces contact with the two static contacts, thereby realizing the connection of the load circuit. In order to monitor the connection of the static contact, some high-voltage DC relays also include auxiliary contacts. At present, the auxiliary contact of a high-voltage DC relay of the prior art includes a conductive part fixed opposite to the push rod and having an upper contact, and two lower contacts located below the conductive part. Since the auxiliary contact of this high-voltage DC relay is of the upper and lower contact type, when the push rod moves downward to contact the conductive part with the lower contact, the conductive part will give the push rod an upward thrust, so that the moving contact piece is more likely to release back and jump, thereby there is a risk of arc reignition. SUMMARY

[0004] The present application provides a high-voltage DC relay with auxiliary contact, which can reduce the risk of moving contact piece releasing back and jumping.

[0005] The technical scheme adopted by the present application to solve the technical problems is: a high-voltage DC relay with auxiliary contact, comprising two static contacts, a moving contact piece, a push rod, a coil assembly, a moving iron core, and an auxiliary contact. The moving iron core is movably arranged in the coil assembly and is fixedly connected with the push rod. The moving contact piece is movably connected with the push rod and cooperates with the two static contacts. The auxiliary contact includes two auxiliary spring pieces arranged in the coil assembly, and the two auxiliary spring pieces are respectively provided with an outgoing end. The push rod is provided with an insulating part and a conductive part distributed upward and downward. With the upward and downward movement of the push rod, the two auxiliary spring pieces clamp the conductive part or the insulating part of the push rod, so as to realize the on-off of the auxiliary contact.

[0006] Further, the insulating part is an insulating sleeve which is sleeved on the bottom of the push rod; or the insulating part is an insulating cap which is fixed on the bottom end of the push rod; or the insulating part is an insulating film coated on the bottom of the push rod.

[0007] Further, the conductive part is integrally formed with the push rod.

[0008] Further, the insulating part is located above the conductive part, or the insulating part is located below the conductive part.

[0009] Further, the two auxiliary spring pieces are flexible spring pieces and can be elastically deformed.

[0010] Further, the two auxiliary spring pieces are flexible spring pieces and can be elastically deformed.

[0011] Further, the two auxiliary spring pieces are mutually symmetrical.

[0012] Further, the coil assembly is provided with a metal shell, and the moving iron core and the two auxiliary spring pieces are located in the metal shell; the bottom of the metal shell is provided with two through holes corresponding to the lead-out ends of the two auxiliary spring pieces, and each of the two through holes is provided with an insulating ring, and the lead-out ends of the two auxiliary spring pieces pass through the insulating rings in the corresponding through holes downward.

[0013] Further, the metal shell comprises a metal shell with open top and bottom and a metal sheet, and the metal sheet is fixedly connected to the bottom opening of the metal shell, and the two through holes are arranged on the metal sheet.

[0014] Further, the two static contacts and the moving contact piece constitute a main contact point, and the on-off state of the main contact point is the same as or opposite to that of the auxiliary contact point composed of the two auxiliary spring pieces and the push rod.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. Since the auxiliary contact point comprises two auxiliary spring pieces, each of which is provided with a lead-out end, and the push rod is provided with an insulating part and a conductive part distributed vertically, and the two auxiliary spring pieces clamp the conductive part or the insulating part of the push rod to realize the on-off of the auxiliary contact point as the push rod moves up and down, so that the present application not only can realize the monitoring function of the auxiliary contact point, but also can offset the rebound force of the moving contact piece when it is released by the contact friction force generated by the two auxiliary spring pieces clamping the conductive part or the insulating part of the push rod, thereby reducing the risk of arc reignition. Therefore, the present application not only does not increase the risk of rebound of the moving contact piece, but also reduces the risk of rebound of the moving contact piece.

[0017] 2. The present application utilizes the insulating part and the conductive part distributed vertically on the push rod to cooperate with the two auxiliary spring pieces, so that the auxiliary contact point can be realized as normally open or normally closed by changing the relative position of the insulating part and the conductive part on the push rod, thereby meeting the use requirements.

[0018] 3. The insulating part is an insulating sleeve, an insulating cap or an insulating film, which is simple in structure and convenient to set. The conductive part is integrally formed with the push rod, thereby avoiding additional setting of the conductive part.

[0019] 4. The two auxiliary spring sheets are flexible spring sheets, which not only make the auxiliary spring sheets have good clamping force and can effectively contact the insulating part or the conductive part, but also realize overstroke and ensure reliable contact of the two auxiliary spring sheets with the conductive part. The two auxiliary spring sheets are respectively provided with a bending part, and the outer round corner of the bending part contacts the insulating part or the conductive part, so that the contact positions of the auxiliary spring sheets and the push rod are switched smoothly when the push rod moves up and down, and there is no jamming.

[0020] The application will be further described in detail in combination with the drawings and embodiments; however, the high-voltage DC relay with auxiliary contact of the application is not limited to the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the core part of the application in the first embodiment;

[0022] Figure 2 is an exploded schematic diagram of the auxiliary contact part of the application in the first embodiment;

[0023] Figure 3 is a schematic diagram of the auxiliary contact part of the application in the first embodiment;

[0024] Figure 4 is a sectional view of the application in the first embodiment in a main contact open state;

[0025] Figure 5 is a sectional view of the application in the first embodiment in a main contact closed state;

[0026] Figure 6 is an exploded schematic diagram of the auxiliary contact part of the application in the second embodiment;

[0027] Figure 7 is an exploded schematic diagram of the auxiliary contact part of the application in the second embodiment;

[0028] Figure 8 is a sectional view of the application in the second embodiment in a main contact open state;

[0029] Figure 9 is a sectional view of the application in the second embodiment in a main contact closed state;

[0030] Figure 10 is an exploded schematic diagram of the auxiliary contact part of the application in the third embodiment;

[0031] Figure 11 is an exploded schematic diagram of the auxiliary contact part of the application in the fourth embodiment. DETAILED DESCRIPTION

[0032] Embodiment One

[0033] Please see Figures 1-5 As shown in the figure, the high-voltage DC relay with auxiliary contact of the present application comprises a relay housing, two static contacts 1, a moving contact 2, a push rod 6, a coil assembly (not shown in the figure), a moving iron core 12, a contact spring 13, a counterforce spring 14 and an auxiliary contact. The moving iron core 12 is movably arranged in the coil assembly and is fixedly connected with the push rod 6. The moving contact 2 is movably connected with the push rod 6 and cooperates with the two static contacts 1. Specifically, a support 3 is arranged at the upper end of the push rod 6, the support 3 is connected with an inverted U-shaped piece 31, the moving contact 2 is located in the U-shaped piece 31, the upper end of the contact spring 13 abuts against the moving contact 2, and the lower end of the contact spring 13 abuts against the support 3. The moving iron core 12 is fixedly sleeved at the position of the substantially middle part of the push rod 6 and is located in the coil assembly. A yoke plate 4 is arranged above the coil assembly, and the coil assembly further has a static iron core 15 located above the moving iron core 12, the static iron core 15 is fixed to the yoke plate 4 and is sleeved outside the push rod 6, and there is a gap between the static iron core 15 and the push rod 6. The upper end of the counterforce spring 14 abuts against the static iron core 15, and the lower end of the counterforce spring 14 abuts against the moving iron core 12. The auxiliary contact comprises two auxiliary spring pieces 8 located in the coil assembly, the two auxiliary spring pieces 8 are respectively provided with cylindrical leading ends 11, and the leading ends 11 extend out of the relay housing. The bottom of the push rod 6 is provided with an upper and lower distributed insulating part and conductive part 61, with the upward and downward movement of the push rod 6, the two auxiliary spring pieces 8 clamp the conductive part 61 or the insulating part of the push rod 6, so as to realize the on-off of the auxiliary contact. That is, with the upward movement of the push rod 6, the two auxiliary spring pieces 8 clamp one of the insulating part and the conductive part 61 of the push rod 6, with the downward movement of the push rod 6, the two auxiliary spring pieces 8 clamp the other one of the insulating part and the conductive part 61 of the push rod 6; when the two auxiliary spring pieces 8 clamp the conductive part 61, the auxiliary contact is in a conductive state; when the two auxiliary spring pieces 8 clamp the insulating part, the auxiliary contact is in a disconnected state.

[0034] In the embodiment, the insulating part is an insulating sleeve 7, which is sleeved outside the bottom of the push rod 6. Specifically, the bottom of the push rod 6 is provided with a necked section 62, and the insulating sleeve 7 is sleeved outside the necked section 62. The conductive part 61 is located below the insulating sleeve 7, and the conductive part 61 is integrally formed with the push rod 6, and the conductive part 61 has a four-side surface. The outer side surface of the insulating sleeve 7 is substantially coplanar with the side surface of the conductive part 61, so that the friction is small when the two auxiliary spring pieces 8 switch the clamping positions with the upward and downward movement of the push rod.

[0035] In the embodiment, the two auxiliary spring pieces 8 are flexible spring pieces and can be elastically deformed. The top part of each auxiliary spring piece 8 is provided with a bent portion 81, and the outer fillet of the bent portion 81 is in contact with the insulating portion or the conductive portion 61. The bottom part of each auxiliary spring piece 8 is in a lying U-shaped structure, and the opening direction of the U-shaped structure is opposite to the direction of the bent portion 81. The lower edge of the U-shaped structure is provided with a jack 82, and the jack 82 is inserted and fixed with the top part of the lead-out end 11. In other embodiments, the bottom part of the auxiliary spring piece is riveted or welded with the lead-out end. The top part of each auxiliary spring piece 8 is in a lying V-shaped structure, and the corner part of the V-shaped structure constitutes the bent portion 81, and the lower edge of the V-shaped structure is integrally connected with the upper edge of the U-shaped structure.

[0036] In the embodiment, the coil assembly is provided with a metal shell, and the moving iron core 12, the static iron core 15 and the two auxiliary spring pieces 8 are located in the metal shell. The bottom part of the metal shell is provided with two through holes 91 corresponding to the lead-out ends of the two auxiliary spring pieces 8, and each through hole 91 is provided with an insulating ring 10. The lead-out end 11 of each auxiliary spring piece 8 passes through the insulating ring 10 in the corresponding through hole downward, and is used for connecting with an external auxiliary contact monitoring loop. The metal shell includes a metal shell 5 with openings at the top end and the bottom end and a metal sheet 9 fixedly connected to the opening at the bottom end of the metal shell 5, and the two through holes 91 are arranged on the metal sheet 9. In this way, the arrangement of the insulating ring 10 is more convenient. In other embodiments, the metal shell is an integrally formed structure.

[0037] In the embodiment, the relay shell includes a shell and an upper cover. The shell is provided with a yoke, and the coil assembly is arranged in the yoke. The upper cover is arranged at the top opening of the shell, and the two static contacts 1 are arranged in the insulating covers at the top part of the iron cup and respectively sealed through the upper cover. The structure of the relay shell is not limited to this, and in other embodiments, the relay shell is composed of an upper shell and a bottom plate or composed of two upper and lower half shells.

[0038] In the embodiment, the on-off state of the main contact composed of the two static contacts 1 and the moving contact 2 is the same as the on-off state of the auxiliary contact, but is not limited to this. In other embodiments, by changing the position of the insulating portion (i.e. the insulating sleeve 7) to be below the conductive portion, the on-off state of the auxiliary contact can be changed to be opposite to the on-off state of the main contact.

[0039] The working principle of the high-voltage DC relay with auxiliary contact of the application is as follows: in normal state, the coil is not powered, the moving contact piece 2 is separated from the two static contact heads 1, that is, the main contact is in the open state, the moving iron core 12 is in the lowest position under the action of the counterforce spring 4, the two auxiliary spring sheets 8 clamp and push the insulating sleeve 7 on the push rod 6, that is, the two auxiliary spring sheets 8 are separated by the insulating sleeve 7, and the auxiliary contact is in the open state, as shown in Figure 4 When the coil is powered, the moving iron core 12 moves upward under the action of the magnetic field, compresses the counterforce spring 4, and drives the push rod 6 to move upward, along with the upward movement of the push rod 6, the moving contact piece 2 moves upward until it contacts the bottom of the two static contact heads 1, and the contact spring 13 is compressed; at the same time, the insulating sleeve 7 on the push rod 6 gradually separates from the two auxiliary spring sheets 8, and the conductive part 61 on the push rod 6 enters the clamping range of the two auxiliary spring sheets 8 and effectively contacts the top of the two auxiliary spring sheets 8, that is, the auxiliary contact is in the closed state, as shown in Figure 5 Therefore, the on-off state of the auxiliary contact is the same as that of the main contact, and the auxiliary contact can feedback the on-off state of the main contact of the high-voltage DC relay.

[0040] The high-voltage DC relay with auxiliary contact of the application not only can realize the monitoring function of the auxiliary contact by the cooperation of the two auxiliary spring sheets 8 and the push rod 6, but also can offset the rebound force of the moving contact piece 2 when it is released by the contact friction force generated by the clamping of the two auxiliary spring sheets 8 on the conductive part or the insulating part of the push rod 6, thereby reducing the risk of arc reignition. Therefore, the application not only does not increase the risk of the rebound of the moving contact piece 2, but also can reduce the risk of the rebound of the moving contact piece 2. The application uses the insulating part and the conductive part 61 distributed in the upper and lower parts of the bottom of the push rod 6 to cooperate with the two auxiliary spring sheets 8, and only needs to change the relative position of the insulating part and the conductive part 61 on the push rod 6 to realize the normally open or normally closed type of the auxiliary contact, thereby meeting the use requirements.

[0041] Example two

[0042] Please refer to Figures 6-9 The high-voltage DC relay with auxiliary contact of the application is different from the above-mentioned example one in that the insulating part is an insulating cap 16 which is fixed to the bottom end of the push rod 6. Specifically, the bottom end of the push rod 6 is provided with a protruding part 62 which is fixed in the insulating cap 16. The conductive part 61 is integrally formed with the push rod 6 and located above the insulating cap 16, and the conductive part 61 has four side surfaces, and the outer surface of the insulating cap 16 is substantially coplanar with the side surface of the conductive part 61. The on-off state of the main contact composed of the two static contact heads 1 and the moving contact piece 2 is opposite to that of the auxiliary contact composed of the two auxiliary spring sheets 8 and the push rod 6.

[0043] In this example, the structure of the two auxiliary spring sheets 8 is the same as that of the auxiliary spring sheet 8 described in the above-mentioned example one, which will not be repeated here.

[0044] The working principle of the high-voltage DC relay with auxiliary contact is as follows: in normal state, the coil is not powered, the moving contact 2 is separated from the two static contacts 1, that is, the main contact is in the open state, the moving core 12 is in the lowest position under the action of the counterforce spring 4, the two auxiliary spring sheets 8 top clamping the conductive part 61 on the push rod 6, that is, the auxiliary contact is in the conductive state, as shown in Figure 8 When the coil is powered, the moving core 12 moves upward under the action of the magnetic field, compresses the counterforce spring 4, and drives the push rod 6 to move upward, along with the upward movement of the push rod 6, the moving contact 2 moves upward until it contacts the bottom of the two static contacts 1, and the contact spring 13 is compressed; at the same time, the conductive part 61 on the push rod 6 gradually separates from the two auxiliary spring sheets 8, and the insulating cap 16 on the push rod 6 enters the clamping range of the two auxiliary spring sheets 8 and effectively contacts the top of the two auxiliary spring sheets 8, that is, the auxiliary contact is disconnected, as shown in Figure 9 Therefore, the on-off state of the auxiliary contact is opposite to that of the main contact, and the auxiliary contact can feedback the on-off state of the main contact of the high-voltage DC relay.

[0045] Example Three

[0046] Please refer to Figure 10 The difference between the high-voltage DC relay with auxiliary contact of the present application and the above-mentioned embodiments is that the insulating part is an insulating film 17 coated on the bottom of the push rod 6.

[0047] In this embodiment, the insulating film 17 is in a ring structure and wraps around the four sides of the bottom of the push rod 6. The conductive part 61 is integrally formed with the push rod 6 and is located below the insulating film 17, and the conductive part 61 has four sides. The on-off state of the main contact composed of the two static contacts 1 and the moving contact 2 is the same as that of the auxiliary contact composed of the two auxiliary spring sheets 8 and the push rod 6, but it is not limited to this.

[0048] The working principle of the high-voltage DC relay with auxiliary contact is as follows: in a normal state, the coil is not powered, the moving contact 2 is separated from the two static contacts 1, that is, the main contact is in an open state, the moving iron core 12 is in the lowest position under the action of the counterforce spring 4, the two auxiliary spring sheets 8 clamp the insulating film 17 on the push rod 6 at the top, that is, the two auxiliary spring sheets 8 are separated by the insulating film 17, and the auxiliary contact is in an open state. When the coil is powered, the moving iron core 12 moves upward under the action of the magnetic field, compresses the counterforce spring 4, and drives the push rod 6 to move upward, along with the upward movement of the push rod 6, the moving contact 2 moves upward until the bottom of the two static contacts 1 is contacted, and the contact spring 13 is compressed; at the same time, the insulating film 17 on the push rod 6 gradually separates upward from the two auxiliary spring sheets 8, and the conductive part 61 on the push rod 6 enters the clamping range of the two auxiliary spring sheets 8 and effectively contacts the top of the two auxiliary spring sheets 8, that is, the auxiliary contact is conducted. Therefore, the on-off state of the auxiliary contact is the same as that of the main contact, and the auxiliary contact can feedback the on-off state of the main contact of the high-voltage DC relay.

[0049] Example four

[0050] Please see Figure 11 The difference between the high-voltage DC relay with auxiliary contact and the above-mentioned example three is that the insulating film 17 is in a cap-shaped structure and wraps the bottom end face and the bottom four side faces of the push rod 6. The conductive part 61 is integrally formed with the push rod 6 and is located above the insulating film 17, and the conductive part 61 has four side faces. The on-off state of the main contact composed of the two static contacts 1 and the moving contact 2 is opposite to that of the auxiliary contact composed of the two auxiliary spring sheets 8 and the push rod 6, but is not limited thereto.

[0051] The working principle of the high-voltage DC relay with auxiliary contact is as follows: in a normal state, the coil is not powered, the moving contact 2 is separated from the two static contacts 1, that is, the main contact is in an open state, the moving iron core 12 is in the lowest position under the action of the counterforce spring 4, the two auxiliary spring sheets 8 clamp the insulating film 17 on the push rod 6 at the top, that is, the two auxiliary spring sheets 8 are separated by the insulating film 17, and the auxiliary contact is in an open state. When the coil is powered, the moving iron core 12 moves upward under the action of the magnetic field, compresses the counterforce spring 4, and drives the push rod 6 to move upward, along with the upward movement of the push rod 6, the moving contact 2 moves upward until the bottom of the two static contacts 1 is contacted, and the contact spring 13 is compressed; at the same time, the insulating film 17 on the push rod 6 gradually separates upward from the two auxiliary spring sheets 8, and the conductive part 61 on the push rod 6 enters the clamping range of the two auxiliary spring sheets 8 and effectively contacts the top of the two auxiliary spring sheets 8, that is, the auxiliary contact is conducted. Therefore, the on-off state of the auxiliary contact is the same as that of the main contact, and the auxiliary contact can feedback the on-off state of the main contact of the high-voltage DC relay.

[0052] The above embodiment is only used to further illustrate the high-voltage DC relay with auxiliary contact according to the present application, but the present application is not limited to the embodiment, and any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application all fall within the protection scope of the technical scheme of the present application.

Claims

1. A high-voltage DC relay with auxiliary contacts, comprising two stationary contacts, a moving contact, a push rod, a coil assembly, a moving iron core, and auxiliary contacts, wherein the moving iron core is movably disposed in the coil assembly and fixedly connected to the push rod; the moving contact is movably connected to the push rod and cooperates with the two stationary contacts; characterized in that: The auxiliary contacts include two auxiliary springs located in the coil assembly, each with a lead-out end; the push rod has an insulating part and a conductive part distributed vertically. As the push rod moves up and down, the two auxiliary springs clamp the conductive part or the insulating part of the push rod to realize the opening and closing of the auxiliary contacts.

2. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The insulating part is an insulating sleeve that is fitted over the bottom of the push rod; or, the insulating part is an insulating cap that is fixed to the bottom of the push rod; or, the insulating part is an insulating film coated on the bottom of the push rod.

3. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The conductive part is integrally formed with the push rod.

4. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The insulating portion is located above the conductive portion, or the insulating portion is located below the conductive portion.

5. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: Both auxiliary springs are flexible and can deform elastically.

6. The high-voltage DC relay with auxiliary contacts according to any one of claims 1-5, characterized in that: The top of each of the two auxiliary springs is provided with a bend, and the outer rounded corner of the bend contacts the insulating part or the conductive part.

7. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The two auxiliary springs are symmetrical to each other.

8. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The coil assembly includes a metal housing, and the moving iron core and two auxiliary springs are located inside the metal housing. The bottom of the metal housing has two through holes that correspond one-to-one with the lead-out ends of the two auxiliary springs. An insulating ring is installed in each of the two through holes, and the lead-out ends of the two auxiliary springs pass downward through the insulating rings in the corresponding through holes.

9. The high-voltage DC relay with auxiliary contacts according to claim 8, characterized in that: The metal housing includes a metal shell with openings at both the top and bottom and a metal plate. The metal plate is fixedly connected to the bottom opening of the metal shell, and the two through holes are provided in the metal plate.

10. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The on / off state of the main contact formed by the two stationary contacts and the moving contact piece is the same as or opposite to the on / off state of the auxiliary contact.

Images