CN219958803U - Contact mechanism - Google Patents

Abstract

The utility model provides a contact mechanism, includes moving contact and two stationary contacts, the stationary contact is equipped with first contact portion, the moving contact includes contact, contact support and contact spring, the contact includes second connecting portion and two second contact portions that are connected with second connecting portion both ends respectively, the contact support is provided with the contact mounting groove that is used for installing the contact, and the contact passes the contact mounting groove, and two second contact portions stretch out outside the contact support, and contact spring effect is between contact and contact support, and two stationary contacts set up in the both sides of contact support, and contact support can rectilinear movement drive the first contact portion contact or the separation of two second contact portions and two stationary contacts of contact, its characterized in that: the static contact positioning structure is arranged on the contact support, and the static contact and the moving contact are installed and positioned through the contact support, so that the static contact and the moving contact are convenient to accurately align, and the follow-up assembly is convenient to integrally carry out.

Description

Contact mechanism

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a contact mechanism of a switching device.

Background

The contact mechanism with two breakpoints in the existing switching device is characterized in that the moving contact and the fixed contact are separately arranged and independently assembled, a positioning structure is not arranged between the moving contact and the fixed contact, accurate alignment of the moving contact and the fixed contact is not facilitated, and the assembly efficiency is low. In addition, the contact mechanism with two breakpoints is provided with an arc isolation structure in the switch shell, so that mutual interference of two breakpoints of arcs is isolated, the arc is led to the arc extinguishing chamber, the arc isolation structure is arranged in the design of the switch shell, the shells of different switching appliances are required to be provided with similar structures, the difficulty is increased for the design of the shells of the switching appliances, and the cost is increased.

Disclosure of Invention

The utility model aims to overcome at least one defect in the prior art and provide an arc extinguishing structure of a switching device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a contact mechanism, includes moving contact and two stationary contacts, the stationary contact is equipped with first contact portion, the moving contact includes contact, contact support and contact spring, the contact includes second connecting portion and two second contact portions that are connected with second connecting portion both ends respectively, the contact support is provided with the contact mounting groove that is used for installing the contact, and the contact passes the contact mounting groove, and two second contact portions stretch out outside the contact support, and contact spring effect is between contact and contact support, and two stationary contacts set up in the both sides of contact support, and contact support can rectilinear movement drive the first contact portion contact or the separation of two second contact portions and two stationary contacts of contact, its characterized in that: the contact support is provided with a static contact positioning structure.

Preferably, the fixed contact is provided with a first avoidance hole, the second contact parts at two ends of the contact respectively penetrate through the first avoidance holes of the two fixed contacts to be matched with the first contact parts of the corresponding fixed contacts, and the fixed contact positioning structure at least partially penetrates through the first avoidance holes of the fixed contacts.

Preferably, the static contact positioning structure comprises two positioning side plates which are oppositely arranged and are arranged in parallel at intervals, a gap between the two positioning side plates is communicated with the contact mounting groove, the contact passes through the two positioning side plates, and the two positioning side plates at least partially pass through the first avoidance hole of the static contact.

Preferably, the static contact comprises a first contact part, a first connecting part and a first wiring part, wherein the first contact part, the first connecting part and the first wiring part are sequentially connected into a C-shaped structure, the first contact part and the first wiring part are oppositely arranged at intervals, two ends of the first connecting part are respectively connected with one ends of the first contact part and the first wiring part, openings of the C-shaped structures of the two static contacts are oppositely arranged, and the first avoiding holes are formed in the first connecting part.

Preferably, the two side edges of the positioning side plate are respectively connected with a second baffle plate and a third baffle plate, and the first connecting part of the static contact is positioned between the second baffle plate and the third baffle plate.

Preferably, two guide grooves are formed in the joint of the first contact part of the fixed contact and the first avoidance hole, and at least part of the side edges of the two positioning side plates extend into the guide grooves to be in sliding fit.

Preferably, the contact support is provided with an arc isolation structure, and the arc isolation structure comprises a baffle plate separated between the first contact parts of the two fixed contacts.

Preferably, the contact support is provided with a spring mounting groove for mounting the contact spring, the contact mounting groove is communicated with the spring mounting groove, the contact penetrates through the contact mounting groove, the second connecting portion is arranged in the contact mounting groove, the baffle extends into the contact mounting groove to support the contact, and the baffle and the contact spring act on two sides of the second connecting portion respectively.

Preferably, when the contact supports the two second contact parts of the linear movement driving contact to contact with and separate from the first contact parts of the two fixed contacts, the baffle is always positioned between the first contact parts of the two fixed contacts.

Preferably, a sliding groove is formed in the bottom of the contact support; and/or the contact support is provided with a connecting hole for being connected with a linkage rod for driving the contact support.

According to the contact mechanism, the fixed contact positioning structure is arranged on the contact support, and the fixed contact and the movable contact are installed and positioned through the contact support, so that the fixed contact and the movable contact are conveniently and accurately aligned, and the follow-up assembly is conveniently carried out integrally.

In addition, be equipped with the arc structure that separates on the contact support for keep apart the contact and support two breakpoint electric arcs of both sides, effectively avoid the mutual interference of two breakpoint electric arcs, need not to set up similar structure in the switch casing, can adapt to install in the different switch casings.

Drawings

Fig. 1 is a schematic structural view of a contact mechanism of the present embodiment;

fig. 2 is a sectional view of a moving contact and a fixed contact of the first embodiment;

fig. 3 is another sectional view of the moving contact and the fixed contact of the first embodiment;

FIG. 4 is a schematic diagram of the arc current loop path during opening;

FIG. 5 is a schematic diagram of the action of the excitation magnetic field of the moving and static contact conductive loop on the arc;

fig. 6 is a schematic structural view of the stationary contact of the present embodiment;

fig. 7 is a schematic view of the structure of the contact support of the present embodiment;

fig. 8 is another cross-sectional view of the moving contact and the fixed contact of the first embodiment.

The elements in the figures are numbered as follows:

the fixed contact 11, the first fixed contact 11A, the second fixed contact 11B, the first contact portion 111, the first connection portion 112, the first connection portion 113, the first striking portion 114, the second striking portion 115, the first escape hole 116, the guide groove 117, the first arc surface 1114, the second arc surface 1115, the first inclined section 1141, the first straight section 1142, the moving contact 12, the contact 120, the second contact portion 121, the third striking portion 122, the second connection portion 123, the contact support 124, the contact mounting groove 1241, the spring mounting groove 1242, the baffle 1243, the chute 1244, the connection hole 1245, the positioning side plate 1246, the second baffle 1247, the third baffle 1248, the second inclined portion 125, the contact spring 126, and the arc extinguishing chamber 14.

Detailed Description

Specific embodiments of the contact mechanism of the present utility model are further described below with reference to the examples shown in the drawings. The contact mechanism of the present utility model is not limited to the description of the embodiments below.

As shown in fig. 1-2, the contact mechanism of the present embodiment is a bridge type double-break contact, including a moving contact 12 and two fixed contacts 11, where the two fixed contacts 11 are a first fixed contact 11A and a second fixed contact 11B, each fixed contact 11 is provided with a first contact portion 111, the moving contact 12 includes a contact 120, a contact support 124 and a contact spring 126, the contact 120 includes a second connection portion 123 and two second contact portions 121 connected with two ends of the second connection portion 123, the two second contact portions 121 are used to cooperate with the first contact portions 111 of the two fixed contacts 11, the contact support 124 is provided with a contact mounting groove 1241 for mounting the contact 120, the contact 120 passes through the contact mounting groove 1241, the two second contact portions 121 extend out of the contact support 124, the contact spring 126 acts between the contact 120 and the contact support and is used to fix the contact 120 on the contact support 124 and implement an overrun, so as to ensure reliable contact between the second contact portions 121 and the fixed contacts 11, the two fixed contacts 11 are symmetrically arranged on two sides of the contact support 124, the two fixed contacts 11 can be moved by the contact support 124 to drive the two fixed contacts 11 to make contact portions contact 11 contact with the two movable contact portions 12 or two fixed contacts 11.

Preferably, as shown in fig. 2 and 7, in a preferred specific structure of the moving contact 12, the contact support 124 is provided with a contact mounting groove 1241 for mounting the contact 120, a spring mounting groove 1242 for mounting the contact spring 126, the contact mounting groove 1241 communicates with the spring mounting groove 1242, the contact 120 penetrates through the contact mounting groove 1241, the second connecting portion 123 is disposed in the contact mounting groove 1241, the contact 120 is perpendicular to the moving direction of the contact support 124, the contact spring 126 is mounted in the spring mounting groove 1242, the contact spring 126 acts between the middle of the contact 120 and the contact support 124, one end of the contact spring 126 acts on the second connecting portion 123 of the contact 120, and one end acts on the top side wall of the spring mounting groove 1242. Preferably, a connecting hole 1245 may be provided in the contact support 124 for connection with a linkage rod of the drive contact support 124, through which the linkage rod may be connected with a power mechanism of the drive contact support 124, and with an adjacent contact support 124.

As shown in fig. 2-3 and 6, the stationary contact 11 includes a first contact portion 111, a first connection portion 112, and a first connection portion 113, the first contact portion 111 is configured to mate with a second contact portion 121 of the contact 120, the first connection portion 113 is configured to connect to a power source, and the first connection portion 112 is connected between the first contact portion 111 and the first connection portion 113. Preferably, the fixed contact 11 is provided with a first avoidance hole 116 for the contact 120 to pass through, and the second contact portion 121 of the contact 120 passes through the first avoidance hole 116 to be matched with the first contact portion 111.

Preferably, as shown in fig. 7, a modified point of this embodiment is that two static contact positioning structures for mounting the static contacts 11 are provided on the contact support 124, the two static contacts 11 may be mounted and positioned on the static contact positioning structures, the contact 120 penetrates through the contact mounting groove 1241 and penetrates through the first avoidance holes 116 of the two static contacts 11, and both the static contacts 11 and the moving contact 12 are mounted and positioned by the contact support 124, so as to facilitate the overall subsequent assembly. The fixed contact positioning structure may include a corresponding fixing structure such as a groove structure, a protruding rib structure, or a fastening structure, and the fixed contact positioning structure may fix the fixed contact 11 together with the casing of the switching device, which all belong to the protection scope of the present utility model. Preferably, the fixed contact positioning structure at least partially passes through the first avoidance hole 116 on the fixed contact 11, and the fixed contact positioning structure in this embodiment includes two positioning side plates 1246 disposed in parallel at opposite intervals.

Preferably, as shown in fig. 2 and 7, another improvement of the contact mechanism of this embodiment is that an arc isolation structure is disposed on the contact support 124, so as to isolate two breakpoint arcs on two sides of the contact support 124, thereby effectively avoiding mutual interference of the two breakpoint arcs and facilitating the arc to move toward the arc extinguishing chamber. The arc isolation structure comprises a baffle 1243 separated between the first contact parts 111 of the two fixed contacts 11, and the baffle 1243 and the contact support 124 are integrally formed without arranging similar structures in switch shells, so that the arc isolation structure can be adaptively installed in different switch shells.

Preferably, in this embodiment, the top end of the baffle 1243 extends into the contact mounting groove 1241 to support the contact 120, the baffle 1243 and the contact spring 126 respectively act on two sides of the second connecting portion 123, and during the linear movement of the contact support 124, whether the contact is switched on or switched off, the baffle 1243 is always located between the first contact portions 111 of the two fixed contacts 11. Preferably, a sliding groove 1244 is further provided at the bottom of the contact support 124, in this embodiment, the sliding groove 1244 is located at the bottom of the baffle 1243, and the sliding groove 1244 may be used for protruding in the switch electrical apparatus casing, has a function of guiding the sliding of the contact support 124, and may further effectively isolate the breakpoint arcs at two sides. In this embodiment, the lower half of the contact support 124 is used as a baffle 1243, and the contact support 124 extends between the two fixed contacts 11, and in other embodiments, the baffle 1243 includes a protruding portion protruding from a side surface of the contact support 124, and a plane of the protruding portion is perpendicular to the contact 120.

Preferably, the contact support 124 in this embodiment is provided with the static contact positioning structure in a protruding manner on two sides perpendicular to the moving direction of the contact support 124, the static contact positioning structure includes two positioning side plates 1246 disposed in parallel at opposite intervals, a gap between the two positioning side plates 1246 is communicated with the contact mounting groove 1241, the contact 120 passes through the two positioning side plates 1246, two side edges of the positioning side plates 1246 are respectively connected with a second baffle 1247 and a third baffle 1248, and the two positioning side plates 1246 at least partially pass through the first avoidance hole 116 of the static contact 11, so that the first connection portion 112 of the static contact 11 is located between the second baffle 1247 and the third baffle 1248. The two positioning side plates 1246 of the present embodiment not only can position the fixed contact 11, but also can be close to the first contact portion 111 of the fixed contact 11, and can also play a role in isolating an arc, i.e. the arc isolating structure includes two positioning side plates 1246. In addition, the third baffle 1248 may be a protruding portion of the partition 1243, and is integrally formed with the partition 1243, that is, the partition 1243 may also be used to limit the stationary contact 11.

Preferably, as shown in fig. 2-3 and 6, in another modification of the contact mechanism of this embodiment, the first contact portion 111, the first connection portion 112 and the first connection portion 113 are sequentially connected into a C-shaped structure, the first contact portion 111 and the first connection portion 113 are disposed opposite to each other at intervals, and are substantially parallel to each other, two ends of the first connection portion 112 are respectively connected with one ends of the first contact portion 111 and the first connection portion 113, a stationary contact is disposed on the first contact portion 111, a first connection hole is disposed on the first connection portion 113, and a first avoidance hole 116 is disposed on the first connection portion 112. The second contact portions 121 at two ends of the contact 120 respectively pass through the first avoidance holes 116 of the two fixed contacts 11 to be matched with the first contact portions 111 of the corresponding fixed contacts 11. The openings of the C-shaped structures of the two fixed contacts 11 are arranged in opposite directions, the openings face the corresponding arc extinguishing chambers 14, the two first connecting portions 112 are arranged in parallel at intervals, the two first wiring portions 113 extend in opposite directions, and the two first contact portions 111 extend in opposite directions; the second contact portion 121 of the contact 120 passes through the first avoidance hole 116 and is disposed between the first wiring portion 113 and the first contact portion 111, the contact support 124 drives the contact 120 to move linearly, and the first avoidance hole 116 is elongated to avoid movement of the contact 120. The contact mechanism of the embodiment can ensure compact volume, and simultaneously has the advantages of convenient wiring of the first wiring part 113 and small size, long opening distance and contribution to improving the driving force of the excitation magnetic field of the moving contact conductive loop to the electric arc, and the opening distance between the second contact part 121 and the first contact part 111.

Preferably, the fixed contact 11 is integrally formed and is formed by bending a conductive plate.

Preferably, the stationary contact 11 further includes a first striking portion 114 and a second striking portion 115, where the first striking portion 114 and the second striking portion 115 are connected to the first contact portion 111 and extend in opposite directions, respectively, the first striking portion 114 extends away from the first connecting portion 112, i.e. in a direction corresponding to the arc extinguishing chamber 14, and extends to the lower side of the corresponding arc extinguishing chamber 14, and the second striking portion 115 extends in a direction opposite to the extending direction of the first striking portion 114, i.e. in a direction in which the first connecting portion 112 is located, and passes through the first avoiding hole 116.

Preferably, as shown in fig. 6, the first avoidance hole 116 of the fixed contact 11 is elongated, and the length direction of the first avoidance hole 116 is parallel to the moving direction of the contact support 124, that is, parallel to the direction from the first contact portion 111 to the first connection portion 113, for avoiding the movement of the contact 120, so that the second contact portion 121 moves between the first contact portion 111 and the first connection portion 113. In this embodiment, the first avoidance hole 116 is rectangular, and two guide grooves 117 are provided at the connection position between the first contact portion 111 of the fixed contact 11 and the first avoidance hole 116 of the first connection portion 112, so that the bottom sides of the two positioning side plates 1246 penetrate through, and at least part of the side edges of the positioning side plates 1246 extend into the guide grooves 117 to be slidably matched. The second arc surface 1115 of the first contact portion 111 is located between the two guide grooves 117, and the second arc striking portion 115 passes through the first avoiding hole 116.

Preferably, the contact 120 is provided with a third striking portion 122, and the two third striking portions 122 are respectively connected to the two second contact portions 121 and extend in the direction corresponding to the arc extinguishing chamber 14. The contact 120 includes a second connection portion 123 and two second contact portions 121 connected to two ends of the second connection portion 123, a movable contact is disposed on the second contact portion 121, the contact 120 is mounted on a contact support 124 through the second connection portion 123, and two third striking portions 122 are connected to the two second contact portions 121 respectively and extend in directions away from each other.

Preferably, as shown in the embodiment of the contact 120 in fig. 3, the second connection portion 123 and the second contact portion 121 have a drop, the two second contact portions 121 are respectively connected to two ends of the second connection portion 123 through two second inclined portions 125, and the inclined surfaces formed by the inclined second inclined portions 125 may enable the arc to be drawn longer. In particular, the inclined surface of the second inclined portion 125 is opposite to the second striking portion 115, so that the arc can be introduced between the inclined surface and the second striking portion 115 from the moving and static contact area, and the arc can be drawn longer. The second connection portion 123 and the second contact portion 121 have a drop height, and the second contact portion 121 is located at a smaller distance from the second connection portion 123 to the first contact portion 111 in the moving direction of the contact 120, and the inclined surface of the second inclined portion 125 and the second striking portion 115 each extend obliquely in a direction away from each other. The second inclined portion 125 and the second striking portion 115 may be used to cooperate with a contact mechanism provided with a permanent magnet, and cooperate with a magnetic field of the permanent magnet to guide an arc, so as to enhance arc extinguishing performance. Of course, as other embodiments, the second inclined portion 125 and/or the second striking portion 115 may not be provided, such as another embodiment of the contact 120 shown in fig. 8.

As shown in fig. 4, when the contact mechanism of the present embodiment is opened, the arc current loop path of the moving contact 12 and the fixed contact 11 separated is: the first connection portion 113 of the first fixed contact 11A, the first connection portion 112 of the first fixed contact 11A, the first striking portion 114 of the first fixed contact 11A, the third striking portion 122, the contact 120, the other third striking portion 122, the first striking portion 114 of the second fixed contact 11B, the first connection portion 112 of the second fixed contact 11B, and the first connection portion 113 of the second fixed contact 11B. The contact mechanism of the present embodiment includes the first striking portion 114, the second striking portion 115, the third striking portion 122, and the second tilting portion 125, and can rapidly guide the arc to the arc extinguishing chamber, and can be used for a switch with a higher rated current.

In this embodiment, the C-shaped structure of the static contact 11 and the structure that the contact 120 passes through the first avoidance hole 116 are beneficial to improving the arc striking effect and improving the driving force of the excitation magnetic field of the conductive loop of the static contact of the magnetic blowing structure. In addition, the C-shaped structure of the fixed contact 11 and the structure that the contact 120 passes through the first avoidance hole 116 are beneficial to improving the opening distance of the first contact part 111 and the second contact part 121 after opening the brake. As shown in fig. 5, when the switching current is large, the switching is turned on (overloaded or shorted), the force F of the exciting magnetic field of the conductive loop of the moving contact drives the switching arc to move toward the corresponding arc-extinguishing chamber 14 area, the switching arc on the left side of the moving contact 12 moves toward the arc-extinguishing chamber 14 on the left side, the switching arc on the right side of the moving contact 12 moves toward the arc-extinguishing chamber 14 on the right side, and the repulsive force of the large current during the short circuit can be utilized to increase the arc-extinguishing speed.

Preferably, as shown in fig. 2-3, in a preferred specific structure of the arc striking structure, a first arc surface 1114 is disposed at an end of the first contact portion 111 away from the first avoidance hole 116, and a second arc surface 1115 is disposed at an end of the first contact portion close to the first avoidance hole 116; the first arc striking part 114 is bent and inclined along the first arc surface 1114 in a direction away from the second contact part 121, and the second arc striking part 115 is inclined along the second arc surface 1115 in a direction opposite to the first arc striking part 114 and away from the second inclined part 125 through the first avoidance hole 116. The first striking portion 114 includes a first inclined section 1141 and a first straight section 1142, one end of the first striking portion 114 is connected to the first contact portion 111 and extends along the first arc surface 1114 in a bending manner in a direction away from the second contact portion 121, the other end of the first striking portion 114 is connected to the first straight section 1142, the first straight section 1142 corresponds to the arc extinguishing chamber 14, and the first straight section 1142 extends to the lower side of the arc extinguishing chamber 14. The end of the second contact portion 121 is provided with a third arc surface, and the third striking portion 122 is bent and obliquely extended along the third arc surface in a direction away from the first contact portion 111. The end of the second contact portion 121 is provided with a third arc surface, and the third striking portion 122 is bent and obliquely extended along the third arc surface in a direction away from the first contact portion 111.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (10)

1. The utility model provides a contact mechanism, includes moving contact (12) and two stationary contact (11), stationary contact (11) are equipped with first contact portion (111), moving contact (12) are including contact (120), contact support (124) and contact spring (126), contact (120) are including second connecting portion (123) and two second contact portions (121) that are connected with second connecting portion (123) both ends respectively, contact support (124) are provided with contact mounting groove (1241) that are used for installing contact (120), contact (120) pass contact mounting groove (1241), outside two second contact portions (121) stretch out contact support (124), contact spring (126) act on between contact (120) and contact support, two stationary contact (11) set up in the both sides of contact support (124), contact support (124) can rectilinear movement drive contact (120) two second contact portions (121) and first contact portion (111) of two stationary contact (11) contact or separation, its characterized in that: a static contact positioning structure is arranged on the contact support (124).

2. The contact mechanism of claim 1, wherein: the static contact (11) is provided with a first avoidance hole (116), second contact parts (121) at two ends of the contact (120) respectively penetrate through the first avoidance holes (116) of the two static contacts (11) to be matched with the first contact parts (111) of the corresponding static contacts (11), and the static contact positioning structure at least partially penetrates through the first avoidance holes (116) of the static contacts (11).

3. The contact mechanism of claim 2, wherein: the static contact positioning structure comprises two positioning side plates (1246) which are oppositely arranged and are arranged in parallel at intervals, a gap between the two positioning side plates (1246) is communicated with the contact mounting groove (1241), the contact (120) passes through the two positioning side plates (1246), and the two positioning side plates (1246) at least partially pass through the first avoidance hole (116) of the static contact (11).

4. A contact mechanism according to claim 3, wherein: the static contact (11) comprises a first contact part (111), a first connecting part (112) and a first wiring part (113), wherein the first contact part (111), the first connecting part (112) and the first wiring part (113) are sequentially connected into a C-shaped structure, the first contact part (111) and the first wiring part (113) are oppositely arranged at intervals, two ends of the first connecting part (112) are respectively connected with one ends of the first contact part (111) and the first wiring part (113), openings of the C-shaped structures of the two static contacts (11) are arranged in a back-to-back mode, and the first connecting part (112) is provided with a first avoidance hole (116).

5. The contact mechanism of claim 4, wherein: the two side edges of the positioning side plate (1246) are respectively connected with a second baffle plate (1247) and a third baffle plate (1248), and a first connecting part (112) of the fixed contact (11) is positioned between the second baffle plate (1247) and the third baffle plate (1248).

6. The contact mechanism of claim 4, wherein: two guide grooves (117) are formed in the joint of the first contact part (111) of the fixed contact (11) and the first avoidance hole (116), and at least part of the side edges of the two positioning side plates (1246) extend into the guide grooves (117) to be in sliding fit.

7. The contact mechanism of claim 1, wherein: the contact support (124) is provided with an arc isolation structure, and the arc isolation structure comprises a baffle (1243) separated between the first contact parts (111) of the two fixed contacts (11).

8. The contact mechanism of claim 7, wherein: the contact support (124) is provided with a spring mounting groove (1242) for mounting the contact spring (126), the contact mounting groove (1241) is communicated with the spring mounting groove (1242), the contact (120) penetrates through the contact mounting groove (1241), the second connecting portion (123) is arranged in the contact mounting groove (1241), the baffle (1243) stretches into the contact mounting groove (1241) to support the contact (120), and the baffle (1243) and the contact spring (126) act on two sides of the second connecting portion (123) respectively.

9. The contact mechanism of claim 7, wherein: when the contact support (124) moves linearly to drive the two second contact parts (121) of the contact (120) to contact with and separate from the first contact parts (111) of the two fixed contacts (11), the baffle (1243) is always positioned between the first contact parts (111) of the two fixed contacts (11).

10. The contact mechanism of claim 1, wherein: a sliding groove (1244) is formed in the bottom of the contact support (124); and/or, the contact support (124) is provided with a connecting hole (1245) for connecting with a linkage rod of the driving contact support (24).