DC contactor

Abstract

The present invention discloses a direct current contactor.SOLUTION: The direct current contactor includes an insulating shell including an upper shell 1 and a lower shell 2 configured to be assembled with each other, a static contact fixed to the upper shell 1 and having a static contact point located in the upper shell 1, a movable contact movably provided in the upper shell 1 and having a movable contact point suitable for electrically contacting the static contact point, and a sealing element 3 provided between the upper shell 1 and the lower shell 2 to realize sealing between the upper shell 1 and the lower shell 2. Therefore, the present invention can effectively prevent external contaminants from entering the arc extinguishing chamber of the insulating shell, so that the movable contact and the static contact are not affected by the external contaminants, ensuring the electrical contact performance of the movable contact and the static contact.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Chinese Patent Application No. CN202421918843.5, filed with the State Intellectual Property Office of China on August 8, 2024, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a direct current contactor (DC contactor). [Background technology]

[0003] In the prior art, DC contactors generally include an upper shell, a lower shell, a stationary contact, and a movable contact. The upper and lower shells are assembled together. An arc extinguishing chamber is defined within the upper shell. The stationary contact is fixed to the upper shell and has a stationary contact located in the arc extinguishing chamber of the upper shell. The movable contact is movably mounted in the arc extinguishing chamber of the upper shell and has a movable contact suitable for electrical contact with the stationary contact. To ensure point contact performance, a precious metal layer, such as a silver alloy layer, is typically applied to the stationary and movable contacts. However, existing non-expandable DC contactors have a gap between the upper and lower shells, which allows external gases to enter the arc extinguishing chamber through the gap. This can cause the silver alloy layer to react with incoming contaminants (such as gases containing Si and S), contaminating the silver alloy layer and degrading electrical contact performance. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made to overcome or mitigate at least one aspect of the above disadvantages. [Means for solving the problem]

[0005] According to an aspect of the present invention, there is provided a direct current contactor (DC contactor), comprising: an insulating shell including an upper shell and a lower shell configured to be assembled together; a stationary contact fixed to the upper shell and having a stationary contact located within the upper shell; a movable contact movably provided within the upper shell and having a movable contact suitable for electrical contact with the stationary contact; and a sealing element provided between the upper shell and the lower shell to provide a seal between the upper shell and the lower shell.

[0006] According to an exemplary embodiment of the present invention, a ring of sealant grooves is formed on the lower end surface of the upper shell, the upper end wall of the lower shell is inserted into the sealant groove of the upper shell, and the sealing element is formed by the sealant filled in the sealant groove.

[0007] According to another exemplary embodiment of the present invention, a plurality of buckles are formed inside the sealant groove, a plurality of snap slots are formed in the upper end wall of the lower shell, and the plurality of buckles are distributed at intervals around the circumference of the upper shell and engage with the plurality of snap slots respectively to lock the lower shell to the upper shell.

[0008] According to another exemplary embodiment of the present invention, the sealant groove has a first inner surface facing the inside of the upper end wall of the lower shell and a second inner surface facing the outside of the upper end wall of the lower shell, the buckle is formed on the first inner surface of the sealant groove, and the upper end wall of the lower shell is pressed against the first inner surface of the sealant groove.

[0009] According to another exemplary embodiment of the present invention, there is a gap between the second inner surface of the sealant groove and the upper end wall of the lower shell, a sealant is filled into the gap, and a groove is formed on the second inner surface of the sealant groove and / or the outer side of the upper end wall of the lower shell, and the groove is bonded to the sealant injected into the gap to enhance the bonding force between the sealant and the insulating shell.

[0010] According to another exemplary embodiment of the present invention, a seal ring mounting groove is formed on the outside of the lower end wall of the upper shell, the seal element includes a seal ring mounted in the seal ring mounting groove, and the seal ring is radially compressed between the lower end wall of the upper shell and the upper end wall of the lower shell.

[0011] According to another exemplary embodiment of the present invention, the seal ring has a circular cross section.

[0012] According to another exemplary embodiment of the present invention, a plurality of buckles are formed on the outside of the lower end wall of the upper shell, the plurality of buckles being located above the seal ring mounting groove and spaced a predetermined distance from the seal ring mounting groove, a plurality of snap slots are formed in the upper end wall of the lower shell, the plurality of buckles are distributed at intervals around the circumferential direction of the upper shell, and engage with the plurality of snap slots respectively to lock the lower shell to the upper shell.

[0013] According to another exemplary embodiment of the present invention, the exterior of the sealing ring has two rings of sealing ribs that are spaced apart axially of the sealing ring to provide a dual layer seal.

[0014] According to another exemplary embodiment of the present invention, a flange is formed on the exterior of the lower end wall of the upper shell, and a seal ring mounting groove is formed on the exterior of the flange.

[0015] According to another exemplary embodiment of the present invention, the flange has a step located above the seal ring mounting groove, and a plurality of convex ribs are formed on the inside of the upper opening of the lower shell, and the plurality of convex ribs engage with the step of the flange to lock the lower shell to the upper shell.

[0016] According to another exemplary embodiment of the present invention, the DC contactor further includes a coil mounted on the lower shell, an auxiliary contact provided on the upper shell, and a plurality of terminals electrically connected to the coil and the auxiliary contact, wherein an insertion slot is formed in the lower shell, the plurality of terminals extend into the insertion slot to respectively mate with a plurality of mating terminals of a connector inserted into the insertion slot, and a sealing adhesive is injected into the insertion slot to achieve a seal between the plurality of terminals and the lower shell.

[0017] In the above exemplary embodiment according to the present invention, the upper shell and the lower shell are sealed by a sealing element provided between the upper shell and the lower shell, thus effectively preventing external pollutant gases from entering the arc extinguishing chamber of the insulating shell, so that the movable contact and the stationary contact are not affected by external pollutant gases and ensuring the electrical contact performance of the movable contact and the stationary contact.

[0018] These and other features of the present invention will become more apparent from the detailed description of illustrative embodiments taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a diagrammatic bottom perspective view of a DC contactor according to a first embodiment of the present invention; FIG. [Figure 2] 1 is a cross-sectional view of a DC contactor according to a first embodiment of the present invention. [Figure 3] 1 is a diagrammatic bottom perspective view of a DC contactor according to a first embodiment of the present invention with the lower shell removed; FIG. [Figure 4] 1 is a cross-sectional view of a DC contactor according to a first embodiment of the present invention with the lower shell removed; FIG. [Figure 5] 1 is a diagrammatic bottom perspective view of the lower shell of a DC contactor according to a first embodiment of the present invention; FIG. [Figure 6] 1 is a cross-sectional view of a lower shell of a DC contactor according to a first embodiment of the present invention. FIG. [Figure 7] FIG. 2 is a cross-sectional view of a DC contactor according to a first embodiment of the present invention, showing a sealing adhesive injected into the insertion slot of the lower shell. [Figure 8] FIG. 10 is a diagrammatic bottom perspective view of a DC contactor according to a second embodiment of the present invention. [Figure 9] FIG. 4 is a cross-sectional view of a DC contactor according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a diagrammatic bottom perspective view of a DC contactor according to a second embodiment of the present invention, with the lower shell and seal ring not shown. [Figure 11] FIG. 10 is a diagrammatic bottom perspective view of the lower shell of a DC contactor according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a diagrammatic bottom perspective view of a DC contactor according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a cross-sectional view of a DC contactor according to a third embodiment of the present invention. [Figure 14] FIG. 10 is an explanatory exploded view of a DC contactor according to a third embodiment of the present invention. [Figure 15] FIG. 10 is a cross-sectional view of a lower shell of a DC contactor according to a third embodiment of the present invention. [Figure 16] FIG. 10 is a cross-sectional view of a DC contactor according to a third embodiment of the present invention, in which the lower shell has not yet been assembled to the upper shell. [Figure 17] FIG. 10 is a cross-sectional view of a DC contactor according to a third embodiment of the present invention, in which the lower shell is assembled to the upper shell. DETAILED DESCRIPTION OF THE INVENTION

[0020] Exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.

[0021] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are diagrammatically shown to simplify the drawings.

[0022] According to a general concept of the present invention, there is provided a direct current contactor (DC contactor), comprising: an insulating shell including an upper shell and a lower shell configured to be assembled together; a stationary contact fixed to the upper shell and having a stationary contact located within the upper shell; a movable contact movably disposed within the upper shell and having a movable contact suitable for electrical contact with the stationary contact; and a sealing element disposed between the upper shell and the lower shell to provide a seal between the upper shell and the lower shell.

[0023] First embodiment Figures 1 to 7 show a DC contactor according to a first embodiment of the present invention. Of these figures, Figure 1 is an illustrative perspective view of the DC contactor according to the first embodiment of the present invention, as seen from the bottom, Figure 2 is a cross-sectional view of the DC contactor according to the first embodiment of the present invention, Figure 3 is an illustrative perspective view of the DC contactor according to the first embodiment of the present invention with the lower shell 2 removed, Figure 4 is a cross-sectional view of the DC contactor according to the first embodiment of the present invention with the lower shell 2 removed, Figure 5 is an illustrative perspective view of the lower shell 2 of the DC contactor according to the first embodiment of the present invention, as seen from the bottom, Figure 6 is a cross-sectional view of the lower shell 2 of the DC contactor according to the first embodiment of the present invention, and Figure 7 is a cross-sectional view of the DC contactor according to the first embodiment of the present invention, showing sealing adhesive 30 injected into insertion slots 201 of the lower shell 2.

[0024] As shown in FIGS. 1 to 7 , a DC contactor is disclosed in an exemplary embodiment of the present invention. The DC contactor includes an insulating shell, a stationary contact 13, a movable contact (not shown), and a sealing element 3. The insulating shell includes an upper shell 1 and a lower shell 2 suitable for assembly with each other. The stationary contact 13 is fixed to the upper shell 1 and has a stationary contact (not shown) located within the upper shell 1, with a silver alloy layer formed on the stationary contact. The movable contact is movably provided within the upper shell 1 and has a movable contact (not shown) suitable for electrical contact with the stationary contact, with a silver alloy layer formed on the movable contact. The sealing element 3 is provided between the upper shell 1 and the lower shell 2 to achieve sealing between the upper shell 1 and the lower shell 2.

[0025] 1 to 7, in the illustrated embodiment, a ring of sealant groove 11 is formed on the lower end surface of the upper shell 1, and the upper end wall 21 of the lower shell 2 is inserted into the sealant groove 11 of the upper shell 1. The sealing element 3 is formed by a sealant injected into the sealant groove 11.

[0026] 1 to 7, in the illustrated embodiment, a plurality of buckles 12 are formed inside the sealant groove 11, and a plurality of snap slots 22 are formed in the upper end wall 21 of the lower shell 2. The plurality of buckles 12 are distributed at intervals around the circumferential direction of the upper shell 1, and engage with the plurality of snap slots 22, respectively, to lock the lower shell 2 to the upper shell 1.

[0027] 1 to 7, in the illustrated embodiment, the sealant groove 11 has a first inner surface 11a facing the inside of the upper end wall 21 of the lower shell 2 and a second inner surface 11b facing the outside of the upper end wall 21 of the lower shell 2. The buckle 12 is formed on the first inner surface 11a of the sealant groove 11, and the upper end wall 21 of the lower shell 2 is pressed against the first inner surface 11a of the sealant groove 11.

[0028] 1 to 7, in the illustrated embodiment, a gap is formed between the second inner surface 11b of the sealant groove 11 and the upper end wall 21 of the lower shell 2, and a sealant is injected into the gap. A groove 21g is formed on the outer side of the second inner surface 11b of the sealant groove 11 and / or the upper end wall 21 of the lower shell 2. The groove 21g is bonded to the sealant injected into the gap, thereby increasing the bonding strength between the sealant and the insulating shell.

[0029] As shown in FIGS. 1 to 7 , in the illustrated embodiment, the DC contactor further includes a coil 14, an auxiliary contact (not shown), and a plurality of terminals 101. The coil 14 is mounted on the lower shell 2. The auxiliary contact is provided on the upper shell 1. The plurality of terminals 101 are electrically connected to the coil 14 and the auxiliary contact, respectively. An insertion slot 201 is formed in the lower shell 2, and the plurality of terminals 101 extend into the insertion slot 201 to mate with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the insertion slot 201. A sealing adhesive 30 is injected into the insertion slot 201 to achieve a seal between the plurality of terminals 101 and the lower shell 2. In this way, external contaminants can be prevented from entering the arc extinguishing chamber of the insulating shell through the gap between the terminal 101 and the lower shell 2.

[0030] Second embodiment Figures 8 to 11 show a DC contactor according to a second embodiment of the present invention. Of these figures, Figure 8 is an explanatory perspective view of the DC contactor according to the second embodiment of the present invention, as seen from the bottom, Figure 9 is a cross-sectional view of the DC contactor according to the second embodiment of the present invention, Figure 10 is an explanatory perspective view of the DC contactor according to the second embodiment of the present invention, as seen from the bottom, without showing the lower shell 2 and seal ring 31, and Figure 11 is an explanatory perspective view of the lower shell 2 of the DC contactor according to the second embodiment of the present invention, as seen from the bottom.

[0031] As shown in FIGS. 8 to 11 , a DC contactor is disclosed in an exemplary embodiment of the present invention. The DC contactor includes an insulating shell, a stationary contact 13, a movable contact (not shown), and a sealing element 3. The insulating shell includes an upper shell 1 and a lower shell 2 suitable for assembly with each other. The stationary contact 13 is fixed to the upper shell 1 and has a stationary contact (not shown) located within the upper shell 1, with a silver alloy layer formed on the stationary contact. The movable contact is provided within the upper shell 1 and has a movable contact (not shown) suitable for electrical contact with the stationary contact, with a silver alloy layer formed on the movable contact. The sealing element 3 is provided between the upper shell 1 and the lower shell 2 to achieve sealing between the upper shell 1 and the lower shell 2.

[0032] 8 to 11, in the illustrated embodiment, a seal ring mounting groove 10 is formed on the outside of the lower end wall of the upper shell 1, and the seal element 3 includes a seal ring 31 mounted in the seal ring mounting groove 10. The seal ring 31 is compressed in the radial direction between the lower end wall of the upper shell 1 and the upper end wall 21 of the lower shell 2.

[0033] As shown in FIGS. 8 to 11, in the illustrated embodiment, the seal ring 31 has a circular cross section.

[0034] 8 to 11, in the illustrated embodiment, a plurality of buckles 12 are formed on the outside of the lower end wall of the upper shell 1, and are located above the seal ring mounting groove 10 and spaced a predetermined distance from the seal ring mounting groove 10. A plurality of snap slots 22 are formed in the upper end wall 21 of the lower shell 2, and the plurality of buckles 12 are distributed at intervals around the circumferential direction of the upper shell 1 and engage with the plurality of snap slots 22, respectively, to lock the lower shell 2 to the upper shell 1.

[0035] As shown in FIGS. 8 to 11 , in the illustrated embodiment, the DC contactor further includes a coil 14, an auxiliary contact (not shown), and a plurality of terminals 101. The coil 14 is mounted on the lower shell 2. The auxiliary contact is provided on the upper shell 1. The plurality of terminals 101 are electrically connected to the coil 14 and the auxiliary contact, respectively. An insertion slot 201 is formed in the lower shell 2, and the plurality of terminals 101 extend into the insertion slot 201 to mate with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the insertion slot 201. A sealing adhesive 30 (see FIG. 7 ) is injected into the insertion slot 201 to achieve a seal between the plurality of terminals 101 and the lower shell 2. In this way, external contaminants can be prevented from entering the arc extinguishing chamber of the insulating shell through the gap between the terminal 101 and the lower shell 2.

[0036] Third embodiment Figures 12 to 17 show a DC contactor according to a third embodiment of the present invention. Of these figures, Figure 12 is an explanatory perspective view of the DC contactor according to the third embodiment of the present invention, as seen from below, Figure 13 is a cross-sectional view of the DC contactor according to the third embodiment of the present invention, Figure 14 is an explanatory exploded view of the DC contactor according to the third embodiment of the present invention, Figure 15 is a cross-sectional view of the lower shell 2 of the DC contactor according to the third embodiment of the present invention, Figure 16 is a cross-sectional view of the DC contactor according to the third embodiment of the present invention, in which the lower shell 2 has not yet been assembled to the upper shell 1, and Figure 17 is a cross-sectional view of the DC contactor according to the third embodiment of the present invention, in which the lower shell 2 has been assembled to the upper shell 1.

[0037] As shown in FIGS. 12 to 17 , a DC contactor is disclosed in an exemplary embodiment of the present invention. The DC contactor includes an insulating shell, a stationary contact 13, a movable contact (not shown), and a sealing element 3. The insulating shell includes an upper shell 1 and a lower shell 2 suitable for assembly with each other. The stationary contact 13 is fixed to the upper shell 1 and has a stationary contact (not shown) located within the upper shell 1, with a silver alloy layer formed on the stationary contact. The movable contact is provided within the upper shell 1 and has a movable contact (not shown) suitable for electrical contact with the stationary contact, with a silver alloy layer formed on the movable contact. The sealing element 3 is provided between the upper shell 1 and the lower shell 2 to achieve sealing between the upper shell 1 and the lower shell 2.

[0038] 12 to 17, in the illustrated embodiment, a seal ring mounting groove 10 is formed on the outside of the lower end wall of the upper shell 1, and the seal element 3 includes a seal ring 31 mounted in the seal ring mounting groove 10. The seal ring 31 is compressed in the radial direction between the lower end wall of the upper shell 1 and the upper end wall 21 of the lower shell 2.

[0039] As shown in Figures 12 to 17, in the illustrated embodiment, the outer side of the seal ring 31 has two rings of seal ribs 31a, which are spaced apart in the axial direction of the seal ring 31 to achieve a two-layer seal, thereby improving sealing performance.

[0040] As shown in FIGS. 12 to 17, in the illustrated embodiment, a flange 15 is formed on the outside of the lower end wall of the upper shell 1, and a seal ring mounting groove 10 is formed on the outside of the flange 15.

[0041] 12 to 17, in the illustrated embodiment, the flange 15 has a step 15a located above the seal ring mounting groove 10, and a plurality of protruding ribs 21a are formed on the inside of the upper opening of the lower shell 2. The plurality of protruding ribs 21a engage with the step 15a of the flange 15 to lock the lower shell 2 to the upper shell 1.

[0042] As shown in FIGS. 12 to 17 , in the illustrated embodiment, the DC contactor further includes a coil 14, an auxiliary contact (not shown), and a plurality of terminals 101. The coil 14 is mounted on the lower shell 2. The auxiliary contact is provided on the upper shell 1. The plurality of terminals 101 are electrically connected to the coil 14 and the auxiliary contact, respectively. An insertion slot 201 is formed in the lower shell 2, and the plurality of terminals 101 extend into the insertion slot 201 to mate with a plurality of mating terminals (not shown) of a connector (not shown) inserted into the insertion slot 201. A sealing adhesive 30 (see FIG. 7 ) is injected into the insertion slot 201 to achieve a seal between the plurality of terminals 101 and the lower shell 2. In this way, external contaminants can be prevented from entering the arc extinguishing chamber of the insulating shell through the gap between the terminal 101 and the lower shell 2.

[0043] It should be understood by those skilled in the art that the above embodiments are illustrative and not restrictive. For example, those skilled in the art can make many modifications to the above embodiments without any contradiction in structure or principle, and can freely combine various features described in different embodiments with each other.

[0044] While several exemplary embodiments have been shown and described, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined in the following claims and their equivalents.

[0045] As used herein, elements described in the singular and preceded by the word "a" or "an" should be understood as not excluding a plurality of said elements or steps, unless such exclusion is expressly stated. Furthermore, references to "one embodiment" of the invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, unless expressly stated otherwise, embodiments "comprising" or "having" an element or elements having a particular characteristic may include additional such elements that do not have that characteristic.

Claims

1. A DC contactor comprising: an insulating shell including an upper shell (1) and a lower shell (2) configured to be assembled together; a stationary contact (13) fixed to the upper shell (1) and having a stationary contact located within the upper shell (1); a movable contact movably mounted within the upper shell (1) and having a movable contact suitable for electrical contact with the stationary contact; a sealing element (3) provided between the upper shell (1) and the lower shell (2) to realize a seal between the upper shell (1) and the lower shell (2); A DC contactor comprising:

2. 2. The DC contactor according to claim 1, wherein a ring of a sealant groove (11) is formed on the lower end surface of the upper shell (1), an upper end wall (21) of the lower shell (2) is inserted into the sealant groove (11) of the upper shell (1), and the sealing element (3) is formed by a sealant filled in the sealant groove (11).

3. 3. The DC contactor according to claim 2, wherein a plurality of buckles (12) are formed inside the sealant groove (11), and a plurality of snap slots (22) are formed in the upper end wall (21) of the lower shell (2), the plurality of buckles (12) are distributed at intervals around the circumferential direction of the upper shell (1) and engage with the plurality of snap slots (22) respectively to lock the lower shell (2) to the upper shell (1).

4. The sealant groove (11) has a first inner surface (11a) facing the inside of the upper end wall (21) of the lower shell (2) and a second inner surface (11b) facing the outside of the upper end wall (21) of the lower shell (2); 4. The DC contactor according to claim 3, wherein the buckle (12) is formed on the first inner surface (11a) of the sealant groove (11), and the upper end wall (21) of the lower shell (2) is pressed against the first inner surface (11a) of the sealant groove (11).

5. a gap is provided between the second inner surface (11b) of the sealant groove (11) and the upper end wall (21) of the lower shell (2), and the sealant is filled in the gap; 5. The DC contactor according to claim 4, wherein a groove (21g) is formed on the second inner surface (11b) of the sealant groove (11) and / or the outer side of the upper end wall (21) of the lower shell (2), and the groove (21g) is bonded to the sealant injected into the gap to enhance the bonding force between the sealant and the insulating shell.

6. a seal ring mounting groove (10) formed on the outer side of the lower end wall of the upper shell (1), and the seal element (3) includes a seal ring (31) mounted in the seal ring mounting groove (10); 2. A DC contactor according to claim 1, wherein the sealing ring (31) is radially compressed between the lower end wall of the upper shell (1) and the upper end wall (21) of the lower shell (2).

7. 7. A DC contactor according to claim 6, wherein the seal ring (31) has a circular cross section.

8. 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 seal ring mounting groove (10) and spaced a predetermined distance from the seal ring mounting groove (10); 8. The DC contactor according to claim 7, wherein a plurality of snap slots (22) are formed in the upper end wall (21) of the lower shell (2), and the plurality of buckles (12) are distributed at intervals around the circumferential direction of the upper shell (1) and engage with the plurality of snap slots (22) respectively to lock the lower shell (2) to the upper shell (1).

9. 7. The DC contactor of claim 6, wherein the outer side of the sealing ring (31) has two rings of sealing ribs (31 a), the sealing ribs (31 a) being spaced apart in the axial direction of the sealing ring (31) to provide a two-layer seal.

10. 10. The DC contactor according to claim 9, wherein a flange (15) is formed on the outer side of the lower end wall of the upper shell (1), and a seal ring mounting groove (10) is formed on the outer side of the flange (15).

11. 11. The DC contactor according to claim 10, wherein the flange (15) has a step (15a) positioned above the seal ring mounting groove (10), and a plurality of convex ribs (21a) are formed on the inside of the upper opening of the lower shell (2), and the plurality of convex ribs (21a) engage with the step (15a) of the flange (15) to lock the lower shell (2) to the upper shell (1).

12. a coil (14) attached to the lower shell (2); an auxiliary contact provided on the upper shell (1); a plurality of terminals (101) electrically connected to the coil (14) and the auxiliary contacts, respectively; Furthermore, An insertion slot (201) is formed in the lower shell (2), and a plurality of terminals (101) extend into the insertion slot (201) to respectively mate with a plurality of mating terminals of a connector inserted into the insertion slot (201); 12. The DC contactor according to claim 1, wherein a sealing adhesive (30) is injected into the insertion slots (201) to achieve a seal between the plurality of terminals (101) and the lower shell (2).

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