DC contactor

Abstract

The utility model discloses a DC contactor. The direct current contactor comprises an insulating shell which comprises an upper shell and a lower shell which are suitable for being assembled together; the static contact is fixed on the upper shell and is provided with a static contact point positioned in the upper shell; the moving contact is movably arranged in the upper shell and is provided with a moving contact which is suitable for being electrically contacted with the static contact; and the sealing element is arranged between the upper shell and the lower shell so as to realize sealing between the upper shell and the lower shell. Therefore, external pollution gas can be effectively prevented from entering the arc extinguish chamber of the insulating shell, so that the movable contact and the static contact are not influenced by the external pollution gas, and the electric contact performance of the movable contact and the static contact is ensured.

Description

Technical Field

[0001] The utility model relates to a DC contactor. Background Art

[0002] In the prior art, a DC contactor generally includes an upper housing, a lower housing, a static contact and a moving contact. The upper housing and the lower housing are assembled together. An arc extinguishing chamber is defined inside the upper housing. The static contact is fixed to the upper housing and has a static contact point located in the arc extinguishing chamber of the upper housing. The moving contact is movably arranged in the arc extinguishing chamber of the upper housing and has a moving contact point adapted to be in electrical contact with the static contact point. In order to ensure the point contact performance, a noble metal layer, such as a silver alloy layer, is usually provided on the static contact point and the moving contact point. However, there is a gap between the upper housing and the lower housing of the existing non-gas-filled DC contactor, and external gas can enter the arc extinguishing chamber through the gap between the upper housing and the lower housing, which will cause the silver alloy layer to react with the entering polluted gas (for example, gas containing Si, S), which will contaminate the silver alloy layer and reduce the electrical contact performance. Summary of the Utility Model

[0003] The purpose of the utility model aims to solve at least one of the above problems and defects existing in the prior art.

[0004] According to one aspect of the utility model, a DC contactor is provided. The DC contactor includes: an insulating housing including an upper housing and a lower housing adapted to be assembled together; a static contact fixed to the upper housing and having a static contact point located inside the upper housing; a moving contact movably arranged inside the upper housing and having a moving contact point adapted to be in electrical contact with the static contact point; and a seal arranged between the upper housing and the lower housing to achieve sealing therebetween.

[0005] According to an exemplary embodiment of the utility model, a ring of potting grooves is formed on the lower end surface of the upper housing, the upper end wall of the lower housing is inserted into the potting grooves of the upper housing and sealing glue is potted in the potting grooves, and the seal is formed by the sealing glue potted in the potting grooves.

[0006] According to another exemplary embodiment of the utility model, a plurality of buckles are formed on the inner side surface of the potting grooves, a plurality of clamping grooves are formed on the upper end wall of the lower housing, and the plurality of buckles are circumferentially spaced apart on the upper housing and are respectively engaged with the plurality of clamping grooves to lock the lower housing to the upper housing.

[0007] According to another exemplary embodiment of the present utility model, the potting groove has a first inner side facing the inner side of the upper end wall of the lower housing and a second inner side facing the outer side of the upper end wall of the lower housing; the buckle is formed on the first inner side of the potting groove and the upper end wall of the lower housing abuts against the first inner side of the potting groove.

[0008] According to another exemplary embodiment of the present utility model, there is a gap between the second inner side of the potting groove and the upper end wall of the lower housing, and the sealant is poured into the gap; grooves are formed on the second inner side of the potting groove and / or the outer side of the upper end wall of the lower housing, and the grooves engage with the sealant poured into the gap to increase the bonding force between the sealant and the insulating housing.

[0009] According to another exemplary embodiment of the present utility model, a sealing ring mounting groove is formed on the outer side of the lower end wall of the upper housing, the seal includes a sealing ring mounted in the sealing ring mounting groove, and the sealing ring is radially pressed between the lower end wall of the upper housing and the upper end wall of the lower housing.

[0010] According to another exemplary embodiment of the present utility model, the cross section of the sealing ring is circular.

[0011] According to another exemplary embodiment of the present utility model, a plurality of buckles are formed on the outer side of the lower end wall of the upper housing, and the plurality of buckles are located above the sealing ring mounting groove and are spaced apart from the sealing ring mounting groove by a predetermined distance; a plurality of clamping grooves are formed on the upper end wall of the lower housing, and the plurality of buckles are circumferentially spaced apart on the upper housing and respectively engage with the plurality of clamping grooves to lock the lower housing to the upper housing.

[0012] According to another exemplary embodiment of the present utility model, the outer side of the sealing ring has two circles of sealing ribs, and the two circles of sealing ribs are spaced apart vertically to achieve double-layer sealing.

[0013] According to another exemplary embodiment of the present utility model, a circle of flange is formed on the outer side of the lower end wall of the upper housing, and the sealing ring mounting groove is formed on the outer side of the flange.

[0014] According to another exemplary embodiment of the present utility model, the flange has a stepped portion located above the sealing ring mounting groove, and a plurality of ribs are formed on the inner side of the upper opening of the lower housing, and the plurality of ribs engage with the stepped portion of the flange to lock the lower housing to the upper housing.

[0015] According to another exemplary embodiment of the present utility model, the DC contactor further includes: a coil disposed in the lower housing; auxiliary contacts disposed in the upper housing; and a plurality of terminals electrically connected to the coil and the auxiliary contacts respectively. A slot is formed in the lower housing, and the plurality of terminals extend into the slot for respectively matingly connecting with a plurality of mating terminals of a connector inserted into the slot. A sealing glue is poured into the slot to achieve sealing between the plurality of terminals and the lower housing.

[0016] In each of the foregoing exemplary embodiments of the present utility model, the upper housing and the lower housing are sealed by a seal disposed therebetween. Therefore, it is possible to effectively prevent external polluting gases from entering the arc extinguishing chamber of the insulating housing, so that the moving contact and the stationary contact are not affected by external polluting gases, ensuring the electrical contact performance of the moving contact and the stationary contact.

[0017] Other objects and advantages of the present utility model will become apparent and can help to provide a comprehensive understanding of the present utility model from the description of the present utility model with reference to the accompanying drawings hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective schematic view of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom;

[0019] Figure 2 A cross-sectional view of the DC contactor according to the first embodiment of the present utility model;

[0020] Figure 3 A perspective schematic view of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom, wherein the lower housing is removed;

[0021] Figure 4 A cross-sectional view of the DC contactor according to the first embodiment of the present utility model, wherein the lower housing is removed;

[0022] Figure 5 A perspective schematic view of the lower housing of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom;

[0023] Figure 6 A cross-sectional view of the lower housing of the DC contactor according to the first embodiment of the present utility model;

[0024] Figure 7 A cross-sectional view of the DC contactor according to the first embodiment of the present utility model, wherein the sealing glue poured into the slot of the lower housing is shown;

[0025] Figure 8Show a perspective view of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom;

[0026] Figure 9 Show a cross-sectional view of the DC contactor according to the second embodiment of the present utility model;

[0027] Figure 10 Show a perspective view of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom, where the lower housing and the sealing ring are not shown;

[0028] Figure 11 Show a perspective view of the lower housing of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom;

[0029] Figure 12 Show a perspective view of the DC contactor according to the third embodiment of the present utility model when viewed from the bottom;

[0030] Figure 13 Show a cross-sectional view of the DC contactor according to the third embodiment of the present utility model;

[0031] Figure 14 Show an exploded view of the DC contactor according to the third embodiment of the present utility model;

[0032] Figure 15 Show a cross-sectional view of the lower housing of the DC contactor according to the third embodiment of the present utility model;

[0033] Figure 16 Show a cross-sectional view of the DC contactor according to the third embodiment of the present utility model, where the lower housing has not been assembled to the upper housing yet;

[0034] Figure 17 Show a cross-sectional view of the DC contactor according to the third embodiment of the present utility model, where the lower housing has been assembled to the upper housing. Detailed implementation manners

[0035] The following further specifically describes the technical solutions of the present utility model through embodiments and in conjunction with the drawings. In the description, the same or similar reference numerals indicate the same or similar components. The description of the embodiments of the present utility model with reference to the drawings below is intended to explain the overall inventive concept of the present utility model and should not be construed as a limitation to the present utility model.

[0036] In addition, in the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments disclosed herein. However, it is obvious that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are illustrated in a schematic manner to simplify the drawings.

[0037] According to a general technical concept of the present utility model, a DC contactor is provided. The DC contactor includes: an insulating housing including an upper housing and a lower housing adapted to be assembled together; a stationary contact fixed to the upper housing and having a stationary contact point located within the upper housing; a movable contact movably disposed within the upper housing and having a movable contact point adapted to make electrical contact with the stationary contact point; and a seal disposed between the upper housing and the lower housing to achieve sealing therebetween.

[0038] First Embodiment

[0039] Figures 1 to 7 Shows a DC contactor according to a first embodiment of the present utility model. Among them, Figure 1 Shows a perspective schematic view of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom; Figure 2 Shows a cross-sectional view of the DC contactor according to the first embodiment of the present utility model; Figure 3 Shows a perspective schematic view of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom, wherein the lower housing 2 is removed; Figure 4 Shows a cross-sectional view of the DC contactor according to the first embodiment of the present utility model, wherein the lower housing 2 is removed; Figure 5 Shows a perspective schematic view of the lower housing 2 of the DC contactor according to the first embodiment of the present utility model when viewed from the bottom; Figure 6 Shows a cross-sectional view of the lower housing 2 of the DC contactor according to the first embodiment of the present utility model; Figure 7 Shows a cross-sectional view of the DC contactor according to the first embodiment of the present utility model, wherein the sealant 3 poured into the slot 201 of the lower housing 2 is shown.

[0040] As Figures 1 to 7 Shown, in an exemplary embodiment of the present utility model, a DC contactor is disclosed. The DC contactor includes: an insulating housing, a stationary contact 13, a movable contact (not shown), and a seal 3. The insulating housing includes an upper housing 1 and a lower housing 2 adapted to be assembled together. The stationary contact 13 is fixed to the upper housing 1 and has a stationary contact point (not shown) located within the upper housing 1, and a silver alloy layer is formed on the stationary contact point. The movable contact is movably disposed within the upper housing 1 and has a movable contact point (not shown) adapted to make electrical contact with the stationary contact point, and a silver alloy layer is formed on the movable contact point. The seal 3 is disposed between the upper housing 1 and the lower housing 2 to achieve sealing therebetween.

[0041] As Figures 1 to 7As shown, in the illustrated embodiment, a glue injection groove 11 is formed on the lower end surface of the upper housing 1. The upper end wall 21 of the lower housing 2 is inserted into the glue injection groove 11 of the upper housing 1 and sealant is poured into the glue injection groove 11. The seal 3 is formed by the sealant poured in the glue injection groove 11.

[0042] As Figures 1 to 7 shown, in the illustrated embodiment, a plurality of buckles 12 are formed on the inner side surface of the glue injection groove 11, and a plurality of card slots 22 are formed on the upper end wall 21 of the lower housing 2. The plurality of buckles 12 are circumferentially spaced apart on the upper housing 1 and are respectively engaged with the plurality of card slots 22 to lock the lower housing 2 to the upper housing 1.

[0043] As Figures 1 to 7 shown, in the illustrated embodiment, the glue injection groove 11 has a first inner side surface 11a facing the inner side of the upper end wall 21 of the lower housing 2 and a second inner side surface 11b facing the outer side of the upper end wall 21 of the lower housing 2. The buckles 12 are formed on the first inner side surface 11a of the glue injection groove 11 and the upper end wall 21 of the lower housing 2 abuts against the first inner side surface 11a of the glue injection groove 11.

[0044] As Figures 1 to 7 shown, in the illustrated embodiment, there is a gap between the second inner side surface 11b of the glue injection groove 11 and the upper end wall 21 of the lower housing 2, and sealant is poured into the gap. Grooves 21g are formed on the outer side of the second inner side surface 11b of the glue injection groove 11 and / or the upper end wall 21 of the lower housing 2, and the grooves 21g are engaged with the sealant poured into the gap to increase the bonding force between the sealant and the insulating housing.

[0045] As Figures 1 to 7 shown, in the illustrated embodiment, the DC contactor further includes: a coil 14, auxiliary contacts (not shown), and a plurality of terminals 101. The coil 14 is disposed in the lower housing 2. The auxiliary contacts are disposed in the upper housing 1. The plurality of terminals 101 are respectively electrically connected to the coil 14 and the auxiliary contacts. A slot 201 is formed in the lower housing 2, and the plurality of terminals 101 extend into the slot 201 for respectively mating and connecting with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the slot 201. Sealant 30 is poured into the slot 201 to achieve sealing between the plurality of terminals 101 and the lower housing 2. In this way, it is possible to prevent external contaminated gas from entering the arc extinguishing chamber of the insulating housing through the gap between the terminals 101 and the lower housing 2.

[0046] Second Embodiment

[0047] Figures 8 to 11 The DC contactor according to the second embodiment of the present invention is shown. Among them, Figure 8Shows a perspective view of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom; Figure 9 Shows a cross-sectional view of the DC contactor according to the second embodiment of the present utility model; Figure 10 Shows a perspective view of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom, where the lower housing 2 and the sealing ring 31 are not shown; Figure 11 Shows a perspective view of the lower housing 2 of the DC contactor according to the second embodiment of the present utility model when viewed from the bottom.

[0048] As Figures 8 to 11 shown, in an exemplary embodiment of the present utility model, a DC contactor is disclosed. The DC contactor includes: an insulating housing, a stationary contact 13, a movable contact (not shown), and a seal 3. The insulating housing includes an upper housing 1 and a lower housing 2 adapted to be assembled together. The stationary contact 13 is fixed to the upper housing 1 and has a stationary contact point (not shown) located inside the upper housing 1, on which a silver alloy layer is formed. The movable contact is movably disposed inside the upper housing 1 and has a movable contact point (not shown) adapted to make electrical contact with the stationary contact point, on which a silver alloy layer is formed. The seal 3 is disposed between the upper housing 1 and the lower housing 2 to achieve sealing therebetween.

[0049] As Figures 8 to 11 shown, in the illustrated embodiment, a seal ring mounting groove 10 is formed on the outer side of the lower end wall of the upper housing 1. The seal 3 includes a seal ring 31 mounted in the seal ring mounting groove 10, and the seal ring 31 is radially pressed between the lower end wall of the upper housing 1 and the upper end wall 21 of the lower housing 2.

[0050] As Figures 8 to 11 shown, in the illustrated embodiment, the cross-section of the seal ring 31 is circular.

[0051] As Figures 8 to 11 shown, in the illustrated embodiment, a plurality of buckles 12 are formed on the outer side of the lower end wall of the upper housing 1 and the plurality of buckles 12 are located above the seal ring mounting groove 10 and are spaced apart from the seal ring mounting groove 10 by a predetermined distance. A plurality of card slots 22 are formed on the upper end wall 21 of the lower housing 2. The plurality of buckles 12 are circumferentially spaced apart on the upper housing 1 and are respectively engaged with the plurality of card slots 22 to lock the lower housing 2 to the upper housing 1.

[0052] As Figures 8 to 11As shown, in the illustrated embodiment, the DC contactor further includes: a coil 14, auxiliary contacts (not shown), and a plurality of terminals 101. The coil 14 is disposed in the lower housing 2. The auxiliary contacts are disposed in the upper housing 1. The plurality of terminals 101 are electrically connected to the coil 14 and the auxiliary contacts respectively. A slot 201 is formed in the lower housing 2, and the plurality of terminals 101 extend into the slot 201 for respectively matingly connecting with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the slot 201. A sealant 30 (see Figure 7 ) is poured into the slot 201 to achieve sealing between the plurality of terminals 101 and the lower housing 2. In this way, it is possible to prevent external polluting gases from entering the arc extinguishing chamber of the insulating housing through the gap between the terminals 101 and the lower housing 2.

[0053] Third Embodiment

[0054] Figures 12 to 17 shows a DC contactor according to a third embodiment of the present invention. Among them, Figure 12 shows a perspective schematic view of the DC contactor according to the third embodiment of the present invention when viewed from the bottom; Figure 13 shows a cross-sectional view of the DC contactor according to the third embodiment of the present invention; Figure 14 shows an exploded schematic view of the DC contactor according to the third embodiment of the present invention; Figure 15 shows a cross-sectional view of the lower housing 2 of the DC contactor according to the third embodiment of the present invention; Figure 16 shows a cross-sectional view of the DC contactor according to the third embodiment of the present invention, where the lower housing 2 has not been assembled to the upper housing 1 yet; Figure 17 shows a cross-sectional view of the DC contactor according to the third embodiment of the present invention, where the lower housing 2 has been assembled to the upper housing 1.

[0055] As Figures 12 to 17 shown, in an exemplary embodiment of the present invention, a DC contactor is disclosed. The DC contactor includes: an insulating housing, a static contact 13, a moving contact (not shown), and a seal 3. The insulating housing includes an upper housing 1 and a lower housing 2 adapted to be assembled together. The static contact 13 is fixed to the upper housing 1 and has a static contact point (not shown) located inside the upper housing 1, and a silver alloy layer is formed on the static contact point. The moving contact is movably disposed inside the upper housing 1 and has a moving contact point (not shown) adapted to be in electrical contact with the static contact point, and a silver alloy layer is formed on the moving contact point. The seal 3 is disposed between the upper housing 1 and the lower housing 2 to achieve sealing between the two.

[0056] As Figures 12 to 17As shown, in the illustrated embodiment, a sealing ring mounting groove 10 is formed on the outer side of the lower end wall of the upper housing 1. The seal 3 includes a sealing ring 31 mounted in the sealing ring mounting groove 10. The sealing ring 31 is radially compressed between the lower end wall of the upper housing 1 and the upper end wall 21 of the lower housing 2.

[0057] As Figures 12 to 17 shown, in the illustrated embodiment, the outer side of the sealing ring 31 has two circles of sealing ribs 31a spaced apart vertically from each other to achieve double-layer sealing, thus improving the sealing performance.

[0058] As Figures 12 to 17 shown, in the illustrated embodiment, a flange 15 is formed on the outer side of the lower end wall of the upper housing 1, and the sealing ring mounting groove 10 is formed on the outer side of the flange 15.

[0059] As Figures 12 to 17 shown, in the illustrated embodiment, the flange 15 has a stepped portion 15a located above the sealing ring mounting groove 10. A plurality of ribs 21a are formed on the inner side of the upper opening of the lower housing 2. The plurality of ribs 21a engage with the stepped portion 15a of the flange 15 to lock the lower housing 2 to the upper housing 1.

[0060] As Figures 12 to 17 shown, in the illustrated embodiment, the DC contactor further includes: a coil 14, auxiliary contacts (not shown), and a plurality of terminals 101. The coil 14 is disposed in the lower housing 2. The auxiliary contacts are disposed in the upper housing 1. The plurality of terminals 101 are respectively electrically connected to the coil 14 and the auxiliary contacts. A slot 201 is formed in the lower housing 2, and the plurality of terminals 101 extend into the slot 201 for respectively mating and connecting with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the slot 201. A sealing glue 30 (see Figure 7 ) is poured into the slot 201 to achieve sealing between the plurality of terminals 101 and the lower housing 2. In this way, it is possible to prevent external polluting gases from entering the arc extinguishing chamber of the insulating housing through the gap between the terminals 101 and the lower housing 2.

[0061] Those skilled in the art can understand that the above-described embodiments are all exemplary, and those skilled in the art can make improvements thereto. The structures described in various embodiments can be freely combined without conflicts in structure or principle, and these changes should reasonably fall within the protection scope of the present invention.

[0062] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the present invention and should not be construed as a limitation to the present invention.

[0063] Although some embodiments of the general concept of the present utility model have been shown and described, those of ordinary skill in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general concept of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

[0064] It should be noted that the term "comprising" does not exclude other elements or steps, and the terms "a" or "an" do not exclude a plurality. Additionally, any element numbering in the claims should not be construed as limiting the scope of the present utility model.

Claims

1. A DC contactor, characterized in that: include: An insulating shell, comprising an upper shell (1) and a lower shell (2) suitable for being assembled together; A stationary contact (13) fixed to the upper housing (1) and having a stationary contact point located inside the upper housing (1); A moving contact, movably arranged in the upper housing (1) and having a moving contact point suitable for electrical contact with the stationary contact point; and A sealing member (3) is arranged between the upper shell (1) and the lower shell (2) to achieve sealing between the two.

2. The DC contactor according to claim 1, characterized in that: A circle of glue pouring grooves (11) is formed on the lower end surface of the upper shell (1), the upper end wall (21) of the lower shell (2) is inserted into the glue pouring groove (11) of the upper shell (1) and sealant is poured into the glue pouring groove (11), and the sealing member (3) is formed by the sealant poured into the glue pouring groove (11).

3. The DC contactor according to claim 2, characterized in that: A plurality of buckles (12) are formed on the inner side surface of the glue injection groove (11), and a plurality of slots (22) are formed on the upper end wall (21) of the lower shell (2). The plurality of buckles (12) are spaced apart in the circumferential direction of the upper shell (1) and are respectively engaged with the plurality of slots (22) so as to lock the lower shell (2) to the upper shell (1).

4. The DC contactor according to claim 3, characterized in that: The glue pouring groove (11) comprises a first inner side surface (11a) facing the inner side of the upper end wall (21) of the lower shell (2) and a second inner side surface (11b) facing the outer side of the upper end wall (21) of the lower shell (2); The buckle (12) is formed on a first inner side surface (11a) of the glue pouring groove (11), and the upper end wall (21) of the lower shell (2) is in contact with the first inner side surface (11a) of the glue pouring groove (11).

5. The DC contactor according to claim 4, characterized in that: There is a gap between the second inner side surface (11b) of the glue pouring groove (11) and the upper end wall (21) of the lower shell (2), and the sealant is poured into the gap; A groove (21g) is formed on the second inner side surface (11b) of the glue pouring groove (11) and / or the outer side of the upper end wall (21) of the lower shell (2), and the groove (21g) is engaged with the sealant poured into the gap to increase the bonding force between the sealant and the insulating shell.

6. The DC contactor according to claim 1, characterized in that: A sealing ring installation groove (10) is formed on the outer side of the lower end wall of the upper shell (1), and the sealing member (3) comprises a sealing ring (31) installed in the sealing ring installation groove (10), wherein the sealing ring (31) is radially squeezed between the lower end wall of the upper shell (1) and the upper end wall (21) of the lower shell (2).

7. The DC contactor according to claim 6, characterized in that: The cross section of the sealing ring (31) is circular.

8. The DC contactor according to claim 7, characterized in that: A plurality of buckles (12) are formed on the outer side of the lower end wall of the upper shell (1), and the plurality of buckles (12) are located above the sealing ring installation groove (10) and are spaced apart from the sealing ring installation groove (10) by a predetermined distance; A plurality of slots (22) are formed on the upper end wall (21) of the lower shell (2), and the plurality of buckles (12) are spaced apart in the circumferential direction of the upper shell (1) and respectively engage with the plurality of slots (22) to lock the lower shell (2) to the upper shell (1).

9. The DC contactor according to claim 6, characterized in that: The outer side of the sealing ring (31) is provided with two circles of sealing ribs (31a), and the two circles of sealing ribs (31a) are spaced apart from each other up and down to achieve double-layer sealing.

10. The DC contactor according to claim 9, characterized in that: A flange (15) is formed on the outer side of the lower end wall of the upper shell (1), and the sealing ring installation groove (10) is formed on the outer side of the flange (15).

11. The DC contactor according to claim 10, characterized in that: The flange (15) has a step portion (15a) located above the sealing ring installation groove (10), and a plurality of ribs (21a) are formed on the inner side of the upper opening of the lower shell (2), and the plurality of ribs (21a) are engaged with the step portion (15a) of the flange (15) to lock the lower shell (2) to the upper shell (1).

12. The DC contactor according to any one of claims 1 to 11, characterized in that: Also includes: A coil (14) is arranged in the lower housing (2); An auxiliary contact is arranged in the upper housing (1); and A plurality of terminals (101) are electrically connected to the coil (14) and the auxiliary contact, respectively. A slot (201) is formed on the lower housing (2), and the plurality of terminals (101) extend into the slot (201) and are used to mate and connect with a plurality of mating terminals of a connector inserted into the slot (201). Sealant (30) is poured into the slot (201) to achieve sealing between the plurality of terminals (101) and the lower housing (2).

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