Push rod Anti-jamming structure and switching device

Abstract

Provided in the present disclosure is a push rod anti-jamming structure. A first space and a second space are provided in a switching device, a partition plate serving as a separation structure between the first space and the second space in the switching device is further provided in the switching device, and a push rod movably passes through the partition plate. The push rod anti-jamming structure comprises an isolation ring and at least one sealing member, wherein the isolation ring is disposed on the partition plate, the isolation ring has a cylindrical body, and the direction in which the isolation ring extends along an axis of the cylindrical body thereof is defined as a longitudinal direction; and the sealing member is fixedly connected to the push rod, the sealing member is provided with an extension structure, and the sealing member forms a sealing fit with an inner wall face and / or an outer wall face of the cylindrical body by means of the extension structure of the sealing member, so as to form a sealing structure between the push rod and the partition plate, thereby preventing foreign objects from falling into an internal space of a contactor through a gap between the push rod and the partition plate.

Description

Push rod anti-stuck structure and switch electrical appliances

[0001] This disclosure claims priority to Chinese patent application No. 202410329915.0 filed on March 21, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of switch electrical appliances, and in particular to a push rod anti-stuck structure and a switch electrical appliance having the push rod anti-stuck structure. Background Art

[0003] A contactor is a highly versatile switching device that can frequently connect and disconnect main circuits and enable remote control. It is widely used in circuit control technology. A contactor generally consists of a control system, a contact system, a motion mechanism, and a sealing system. The motion mechanism typically includes an electromagnet. When power is supplied to the electromagnet's coil, the coil generates a magnetic field, which attracts the movable core, causing it to move upward. This forces the reaction spring to compress, generating a reaction force. When the movable contact bridge contacts the stationary contact, the contact spring also compresses, generating a reaction force. When the movable core contacts the stationary core, movement ceases, the movable contact bridge and the stationary contact establish reliable contact, and conduction is established between the two stationary contacts, energizing the controlled external circuit. When power is removed from the coil, the attraction ceases, and the contact spring and reaction spring simultaneously act to move the movable core downward. When the movable contact bridge separates from the stationary contact, the reaction force of the contact spring disappears, but the reaction spring continues to provide a reaction force, causing the movable core to move downward until the push rod seat contacts the stationary core, at which point the movable core returns to its original position and the controlled external circuit is completely disconnected.

[0004] In existing contactors, the arc-extinguishing chamber housing the contact system communicates with the actuating chamber housing the electromagnet and other magnetic circuit mechanisms. A partition between the arc-extinguishing and actuating chambers is fitted with a clearance between the partition and the push rod. During frequent connection and disconnection of the contact system, foreign matter generated by arcing between the moving and static contacts in the arc-extinguishing chamber can easily fall into the magnetic circuit mechanism through the gap between the partition and the push rod, causing the moving iron core to become stuck and fail, affecting normal contactor actuation and leading to unexpected risks.

[0005] Existing contactors also use a transversely positioned sealing ring to seal the gap between the partition and the push rod. This transversely positioned sealing ring is subject to significant lateral extrusion, resulting in significant internal stress. As the sealing ring repeatedly moves up and down with the push rod, it experiences a cyclical stress combining lateral extrusion and longitudinal friction, making it susceptible to aging and fracture. Summary of the Invention

[0006] To this end, in response to at least one of the above problems, the present disclosure provides a push rod anti-stuck structure and a switch electrical appliance having the push rod anti-stuck structure.

[0007] This disclosure is implemented using the following scheme:

[0008] The present disclosure proposes a push rod anti-stuck structure, wherein the push rod is used to actuate the contact system of a switching electrical appliance; a first space and a second space are provided in the switching electrical appliance, and the switching electrical appliance is further provided with a partition plate serving as a partition structure for separating the first space and the second space in the switching electrical appliance, and the push rod is movably passed through the partition plate, and is characterized in that the push rod anti-stuck structure includes an isolation ring and at least one sealing member, the isolation ring is provided on the partition plate, the isolation ring has a cylindrical main body, and the direction in which the isolation ring extends along the axis of its cylindrical main body is defined as the longitudinal direction; the sealing member is fixedly connected to the push rod, and the sealing member is provided with an extension structure, and the sealing member forms a sealing fit with the inner wall surface and / or outer wall surface of the cylindrical main body through its extension structure.

[0009] In one embodiment, the sealing cooperation between the sealing member and the cylindrical body further forms a guiding structure.

[0010] In one embodiment, the seal is a sealing sleeve, which includes a base for fixedly connecting to the push rod and a longitudinally extending sealing cylinder portion, the sealing cylinder portion is made of a flexible material with elastic force, and the sealing cylinder portion serves as the extension structure for sealingly cooperating with the cylindrical body, the inner wall surface or outer wall surface of the sealing cylinder portion and the outer wall surface or inner wall surface of the cylindrical body form a surface-to-surface sealing structure, and the sealing member is guided during the sliding stroke by means of the surface-to-surface sealing structure.

[0011] In one embodiment, the sealing sleeve is fixedly connected to a mounting seat through the base, and the mounting seat is fixedly connected to the push rod, so that the push rod is fixedly connected to the sealing sleeve; the mounting seat has an outer edge, and the outer edge completely covers the range of the cylindrical body of the isolation ring in the radial direction and continues to extend outward.

[0012] In one embodiment, the outer edge extends downward to form a lower flange, and the lower flange at least partially covers the outer side of the cylindrical body of the isolation ring, so that a labyrinth seal is achieved between the lower flange, the cylindrical body and the sealing cylinder portion.

[0013] In one embodiment, a chamfered portion is formed at an open end of the cylindrical body of the isolating ring.

[0014] In one embodiment, the sealing member is a sealing sleeve, which is made of a flexible material with elastic force. The sealing sleeve includes a base and a first sealing cylindrical portion and a second sealing cylindrical portion extending longitudinally from the outer edge of the base. The first sealing cylindrical portion and the second sealing cylindrical portion are spaced apart and nested with each other. The second sealing cylindrical portion is located on the outside of the first sealing cylindrical portion. The cylindrical body of the isolation ring is inserted between the first sealing cylindrical portion and the second sealing cylindrical portion. A labyrinth seal is realized between the second sealing cylindrical portion, the cylindrical body and the first sealing cylindrical portion.

[0015] In one embodiment, the seal is a sealing sleeve, which includes a base for fixedly connecting to the push rod and a longitudinally extending elastic cylindrical portion, the elastic cylindrical portion includes a sealing contact section arranged at the lower end, the elastic cylindrical portion is made of a rigid material with elastic force, and the elastic cylindrical portion serves as the extension structure for sealingly cooperating with the cylindrical main body portion, and the sealing contact section at the lower end of the elastic cylindrical portion forms a line and surface sealing structure with the inner wall surface and / or outer wall surface of the cylindrical main body.

[0016] In one embodiment, the sealing sleeve is a first sealing sleeve and a second sealing sleeve respectively located on the outside and inside of the cylindrical body, and the first sealing sleeve and the second sealing sleeve both apply a sealing force toward the cylindrical body to realize a clamping structure for clamping the inner and outer wall surfaces of the cylindrical body, and the sealing member is guided during the sliding stroke by means of the clamping structure.

[0017] In one embodiment, the isolation ring is made of a rigid material.

[0018] In one embodiment, the push rod is movable relative to the partition along the longitudinal direction.

[0019] In one embodiment, the end surface of the partition is recessed to provide a clearance groove, and the clearance groove is used to make room for the sealing member.

[0020] The present disclosure further provides a switch electrical appliance, characterized by comprising the push rod anti-stuck structure as described above.

[0021] In one embodiment, the switching device is a contactor.

[0022] The technical solution provided by this disclosure has the following technical effects:

[0023] 1. The present disclosure provides a push rod anti-stuck structure, comprising an isolation ring and at least one sealing member, wherein the isolation ring is arranged on a partition, and the isolation ring has a cylindrical main body, and the direction in which the isolation ring extends along the axis of its cylindrical main body is defined as the longitudinal direction; the sealing member is fixedly connected to the push rod, and the sealing member is configured as a structure extending along the longitudinal direction, and the sealing member forms a sealing fit with the inner wall surface and / or outer wall surface of the cylindrical main body through its extension structure, so as to prevent the normal actuation of the push rod from being affected by the jamming of foreign objects.

[0024] 2. The inner wall surface or outer wall surface of the sealing cylinder portion forms a surface-to-surface sealing structure with the outer wall surface or inner wall surface of the cylindrical body, and the surface-to-surface sealing structure is used to guide the seal during the sliding stroke; or the sealing sleeve is a first sealing sleeve and a second sealing sleeve respectively located on the outside and inside of the cylindrical body, and the first sealing sleeve and the second sealing sleeve both apply a sealing force toward the cylindrical body to form a clamping structure for clamping the inner and outer wall surfaces of the cylindrical body, and the clamping structure is used to guide the seal during the sliding stroke, so that the movement of the push rod is smoother.

[0025] 3. The present disclosure optionally provides a mounting seat with an outer edge, which extends downward to form a lower flange. The lower flange at least partially covers the outer side of the cylindrical body of the isolation ring, so that a labyrinth seal is achieved between the lower flange, the cylindrical body and the sealing cylindrical portion, thereby improving the sealing effect. Alternatively, the sealing sleeve includes a first sealing cylindrical portion and a second sealing cylindrical portion extending longitudinally, the first sealing cylindrical portion and the second sealing cylindrical portion are spaced apart, the second sealing cylindrical portion is sleeved on the outer side of the first sealing cylindrical portion, the cylindrical body of the isolation ring is inserted between the first sealing cylindrical portion and the second sealing cylindrical portion, and a labyrinth seal is achieved between the second sealing cylindrical portion, the cylindrical body and the first sealing cylindrical portion to improve the sealing effect and enhance the guiding effect of the seal during the sliding stroke, so that the movement of the push rod is smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a cross-sectional view of a first embodiment of a contactor in a switching device disclosed herein;

[0027] FIG2 is a top view of FIG1 ;

[0028] FIG3 is an enlarged view of position A in FIG1 when the contactor is in a non-energized state;

[0029] FIG4 is an enlarged view of position A in FIG1 when the contactor is in an energized state;

[0030] FIG5 is a cross-sectional view of a second embodiment of a contactor in a switching device of the present disclosure;

[0031] FIG6 is an enlarged view of point B in FIG5 ;

[0032] FIG7 is a cross-sectional view of a third embodiment of a contactor in a switching device of the present disclosure;

[0033] FIG8 is an enlarged view of point C in FIG7 . DETAILED DESCRIPTION

[0034] To further illustrate various embodiments, the present disclosure is accompanied by accompanying drawings. These drawings form part of the disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of the present disclosure. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0035] The present disclosure will now be further described with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] As shown in Figures 1-4, this embodiment provides a contactor 1 comprising a hollow housing 2. A partition 10 is disposed within the housing 2, thereby dividing the space within the housing 2 into a first space 21 and a second space 22. In this embodiment, the first space 21 is an arc-extinguishing chamber for housing the contact system 3; the second space 22 is an actuating chamber for housing the magnetic circuit system 4. A push rod 6 is movably disposed through the partition 10.

[0038] The magnetic circuit system 4 is used to actuate the push rod 6 to generate movement. The contact system 3 includes two fixed contacts 11 and 12 (hereinafter referred to as the first fixed contact 11 and the second fixed contact 12) provided on the housing 2, and a moving contact 7. The push rod 6 is transmission-connected to the moving contact 7. A contact spring 9 is provided between the push rod 6 and the moving contact 7. A mounting seat 14 is fixed on the push rod 6. The mounting seat 14 is a spring seat. The push rod 6 abuts against one end of the contact spring 9 through the mounting seat 14. The other end of the contact spring 9 is connected to the moving contact 7. The magnetic circuit system 4 is excited to generate magnetic force, actuating the push rod 6 to generate movement. The push rod 6 drives the moving contact 7 to move and contact the first fixed contact 11 and the second fixed contact 12, so that the first fixed contact 11 and the second fixed contact 12 are connected, and the controlled external circuit is connected. At this time, the contact spring 9 is also compressed. The push rod 6 is connected to a reset spring 8. When the magnetic circuit system 4 is in a non-excited state, no magnetic force is generated in the magnetic circuit system 4. The push rod 6 moves in the direction of returning to its original position due to the action of the reset spring 8 and the contact spring 9. After the contact spring 9 is completely released and restored, the moving contact 7 is disconnected from the first fixed contact 11 and the second fixed contact 12. The push rod 6 is reset to its initial position due to the action of the reset spring 8. The first fixed contact 11 and the second fixed contact 12 are disconnected, and the controlled external circuit is disconnected. The contactor 1 is also provided with a control connector 13 for inputting or disconnecting an excitation signal to the magnetic circuit system 4.

[0039] Since the existing contact system is frequently connected and disconnected, foreign matter generated by arcing in the first space 21, i.e., the arc extinguishing chamber, between the moving contact and the fixed contact can easily fall into the magnetic circuit system 4 through the gap between the partition 10 and the push rod 6, causing the push rod 6 to become stuck and fail, which will affect the normal actuation of the contactor 1.

[0040] Based on this, in this embodiment, a push rod anti-stuck structure is provided between the push rod 6 and the partition 10. Specifically, as shown in FIG3 , the push rod anti-stuck structure includes a seal 15 and an isolation ring 16, and the seal 15 is fixedly connected to the push rod 6. For example, the seal 15 can be fixedly connected to the push rod 6 through a mounting seat 14. In this embodiment, the mounting seat 14 is a spring seat, and the seal 15 is fixedly connected to the mounting seat 14, so that the seal 15 is fixedly connected to the push rod 6. The seal 15 and the mounting seat 14 can be integrally injection molded, so that the seal 15 is fixedly connected to the mounting seat 14; or the seal 15 and the mounting seat 14 can be manufactured separately, and then the seal 15 is fixedly connected to the mounting seat 14 through a connecting structure.

[0041] As shown in Figures 1 and 3, the isolation ring 16 has a cylindrical body 161 and a connecting portion 162. The cylindrical body 161 and the connecting portion 162 are connected to each other. The cylindrical body 161 is a hollow cylindrical structure with openings at both ends. It can be a cylindrical cylindrical body, or it can also be a cylindrical body with a cross-section of other shapes, such as a cylindrical body with a square or rectangular cross-section. As shown in Figure 1, the direction in which the isolation ring 16 extends along the axis X of its cylindrical body 161 is defined as the longitudinal direction. The isolation ring 16 is arranged on the partition 10, wherein the isolation ring 16 can be directly arranged on the partition 10, or it can be indirectly arranged on the partition 10 through a spacer. In this embodiment, the connecting portion 162 of the isolation ring 16 is used to connect to the partition 10, so that the isolation ring 16 is connected to the partition 10. In other embodiments, the connecting portion 162 can also be integrally formed with the partition 10. In which, the push rod 6 can move relative to the partition 10 in the longitudinal direction.

[0042] As shown in Figures 1 and 3, the seal 15 is a sealing sleeve and includes a base 151 and a sealing cylindrical portion 152 extending longitudinally from the outer edge of the base 151. The sealing cylindrical portion 152 is an extended structure extending longitudinally along the isolation ring 16. The sealing cylindrical portion 152 is annularly arranged around the push rod 6. The base 151 is connected to the mounting seat 14, thereby fixing the seal 15 to the mounting seat 14. In some embodiments, the base 151 can also be integrally formed with the mounting seat 14, or the base 151 can be fixedly connected to the push rod 6.

[0043] In this embodiment, the seal 15 is sealed with the inner wall surface of the cylindrical body 161 through its sealing cylindrical body portion 152. The sealing cylindrical body portion 152 is in contact with the inner wall surface of the cylindrical body 161 and has a slight interference fit, so that during the movement of the push rod 6, the sealing cylindrical body portion 152 and the inner wall surface of the cylindrical body 161 always remain in contact. In this way, a sealing structure is formed between the push rod 6 and the partition 10, preventing foreign matter from falling into the internal space of the contactor 1 through the gap between the push rod 6 and the partition 10, affecting the normal actuation of the push rod 6. Compared with the sealing structure with a transversely arranged sealing ring, the seal 15 of this embodiment is sealed with the inner wall surface of the cylindrical body 161 through its longitudinally extending extension structure. The stress formed in the seal 15 is smaller, which can greatly improve the service life of the seal 15. Furthermore, the sealing body portion 152 forms a surface-to-surface sealing structure with the inner wall surface of the cylindrical body 161, and the surface-to-surface sealing structure guides the sealing member during the sliding stroke, thereby having a guiding effect, which can guide the axial movement of the push rod 6, making the movement of the push rod 6 smoother. Alternatively, the sealing member 15 can form a sealing fit with the outer wall surface of the cylindrical body 161 through its sealing body portion 152, that is, the sealing body portion 152 is sleeved on the outer side of the cylindrical body 161.

[0044] The seal 15 is made of a flexible material with resilience. For example, the seal 15 is made of rubber material. Referring to Figures 3-4, in this embodiment, the seal 15 contacts the inner wall surface of the cylindrical body 161 through its sealing cylinder portion 152 and has a slight interference fit, so that during the movement of the push rod 6, the sealing cylinder portion 152 and the inner wall surface of the cylindrical body 161 always remain in contact. Since the seal 15 is made of a flexible material with resilience, the seal 15 can be deformed at the point of contact with the isolation ring 16. When the push rod 6 moves, the seal 15 and the isolation ring 16 can always remain in contact, thereby enhancing the sealing performance and at the same time having a certain effect of absorbing vibration and reducing noise.

[0045] Referring to Figure 3 , in this embodiment, a recessed groove 101 is provided on the end surface of the partition 10. The recess 101 allows space for the seal 15, preventing the seal 15 from directly contacting the partition 10 during movement. This would generate a certain amount of noise and also create the risk of contact bounce. The provision of the recess 101 can reduce the risk of contact bounce and the generation of noise.

[0046] 3 , a chamfered portion 1611 is formed at the open end of the cylindrical body 161 of the isolation ring 16 . Due to the provision of the chamfered portion 1611 , the assembly between the seal 15 and the isolation ring 16 is more convenient.

[0047] Referring to Figure 3 , the mounting base 14 has an outer edge 141 that completely radially covers the cylindrical body 161 of the isolation ring 16 . This configuration provides the outer edge 141 of the mounting base 14 with a "roof-like" structure, which similarly prevents foreign matter from falling into the interior of the contactor 1 . Referring to Figure 3 , the outer edge 141 further extends downward to form a lower flange 142 , which at least partially covers the exterior of the cylindrical body 161 of the isolation ring 16 . This creates multiple seals between the lower flange 142 , the cylindrical body 161 , and the sealing cylindrical portion 152 , achieving a labyrinth seal. This further prevents foreign matter from falling into the interior of the contactor 1 and enhances the sealing effect.

[0048] Example 2

[0049] In this embodiment, the seal and mounting seat of the contactor 1' are different from those in Example 1, and the rest are the same as those in Example 1. The outer edge of the mounting seat 14' in this embodiment does not extend downward to form a lower flange. Referring to Figures 5-6, instead, the seal 15' in this embodiment includes a base 151 and a first sealing cylindrical body portion 152 and a second sealing cylindrical body portion 153 extending longitudinally from the outer edge of the base 151. The first sealing cylindrical body portion 152 and the second sealing cylindrical body portion 153 are extended structures extending longitudinally along the isolation ring 16. The first sealing cylindrical body portion 152 and the second sealing cylindrical body portion 153 are spaced apart, and the second sealing cylindrical body portion 153 is sleeved on the outside of the first sealing cylindrical body portion 152. The cylindrical body 161 of the isolation ring 16 is inserted between the first sealing cylindrical body portion 152 and the second sealing cylindrical body portion 153.

[0050] The first sealing cylindrical portion 152 contacts the inner wall surface of the cylindrical body 161 and has a slight interference fit. The sealing member 15' is sealed and matched with the inner wall surface of the cylindrical body 161 through the first sealing cylindrical portion 152, so that during the movement of the push rod 6, the first sealing cylindrical portion 152 and the inner wall surface of the cylindrical body 161 always remain in contact. In this way, a sealing structure is formed between the push rod 6 and the partition 10, preventing foreign matter from falling into the internal space of the contactor 1 through the gap between the push rod 6 and the partition 10, affecting the normal actuation of the push rod 6. The first sealing cylindrical portion 152 forms a face-to-face sealing structure with the inner wall surface of the cylindrical body 161, and the face-to-face sealing structure is used to guide the sealing member during the sliding stroke, thereby having a guiding effect, which can play a certain guiding role in the axial movement of the push rod 6, making the movement of the push rod 6 smoother. Alternatively, the second sealing cylindrical portion 153 contacts the outer wall surface of the cylindrical body 161 and has a slight interference fit, and the sealing member 15' is sealed and fitted with the outer wall surface of the cylindrical body 161 through the second sealing cylindrical portion 153. Alternatively, the first sealing cylindrical portion 152 contacts the inner wall surface of the cylindrical body 161 and has a slight interference fit, and the second sealing cylindrical portion 153 contacts the outer wall surface of the cylindrical body 161 and has a slight interference fit, and the sealing member 15' is sealed and fitted with the inner and outer wall surfaces of the cylindrical body 161 through the first sealing cylindrical portion 152 and the second sealing cylindrical portion 153. Such an arrangement provides better sealing and guiding properties.

[0051] 5-6 , the second sealing cylindrical portion 153 is arranged around the outside of the cylindrical body 161 and is spaced apart from the cylindrical body 161 . In this way, multiple seals are formed between the second sealing cylindrical portion 153 , the cylindrical body 161 and the first sealing cylindrical portion 152 , realizing a labyrinth seal, further preventing foreign matter from falling into the internal space of the contactor 1 and improving the sealing effect.

[0052] In this embodiment, the seal 15 is made of a flexible material with resilience. Because the seal 15 is made of a flexible material with resilience, it can deform at the point of contact with the isolation ring 16. This allows the seal 15 and isolation ring 16 to maintain contact when the push rod 6 moves, enhancing sealing while also absorbing vibration and reducing noise.

[0053] Example 3

[0054] The push rod anti-jamming structure of the contactor 1" in this embodiment is different from that in Example 2, and the rest is the same as that in Example 2. As shown in Figures 7-8, the push rod anti-jamming structure in this embodiment includes an isolation ring 16 and a seal. The seal includes a first sealing sleeve 17 and a second sealing sleeve 18, and the first sealing sleeve 17 and the second sealing sleeve 18 are fixedly connected to the push rod 6. For example, the first sealing sleeve 17 and the second sealing sleeve 18 can be fixedly connected to the push rod 6 through a mounting seat 14. In this embodiment, the mounting seat 14 is a spring seat, and the first sealing sleeve 17 and the second sealing sleeve 18 are fixedly connected to the mounting seat 14, so that the first sealing sleeve 17 and the second sealing sleeve 18 are fixedly connected to the push rod 6.

[0055] As shown in Figures 7-8, the isolation ring 16 includes a cylindrical body 161 and a connecting portion 162. The cylindrical body 161 and the connecting portion 162 are connected to each other. The connecting portion 162 is used to connect to the partition 10, thereby connecting the isolation ring 16 to the partition 10. In other embodiments, the connecting portion 162 can also be integrally formed with the partition 10.

[0056] The first sealing sleeve 17 and the second sealing sleeve 18 are respectively located on the inner and outer sides of the cylindrical body 161. As shown in Figures 7-8, the first sealing sleeve 17 includes a first base 171 connected to each other and a first elastic cylindrical portion 172 extending longitudinally. The second sealing sleeve 18 includes a second base 181 connected to each other and a second elastic cylindrical portion 182 extending longitudinally. The first base 171 and the second base 181 are both used to connect to the mounting base 14. In some embodiments, the first base 171 and the second base 181 can also be integrally formed with the mounting base 14; or the first base 171 and the second base 181 are fixedly connected to the push rod 6. The first sealing sleeve 17 and the second sealing sleeve 18 are both arranged around the push rod 6, and the first elastic cylindrical body portion 172 includes a first sealing contact section arranged at the lower end. Specifically, the first sealing contact section is formed by bending the section at the lower end of the first elastic cylindrical body portion 172. The first elastic cylindrical body portion 172 is located on the inner side of the cylindrical body 161 and contacts the inner wall surface of the cylindrical body 161 through the first sealing contact section at the lower end and has a slight interference fit. The first sealing sleeve 17 is sealed with the inner wall surface of the cylindrical body 161 through the first elastic cylindrical body portion 172, and the sealing contact section at the lower end of the first elastic cylindrical body portion 172 forms a line and surface sealing structure with the inner wall surface of the cylindrical body 161. The second elastic cylindrical portion 182 includes a second sealing contact section provided at the lower end. Specifically, the second sealing contact section is formed by bending the lower end section of the second elastic cylindrical portion 182. The second elastic cylindrical portion 182 is located on the outside of the cylindrical body 161 and contacts the outer wall surface of the cylindrical body 161 through the second sealing contact section at the lower end and has a slight interference fit. The second sealing sleeve 18 is sealed with the outer wall surface of the cylindrical body 161 through the second elastic cylindrical portion 182. The sealing contact section at the lower end of the second elastic cylindrical portion 182 forms a sealing structure with a line and surface seal with the outer wall surface of the cylindrical body 161. As a result, the first sealing sleeve 17, the second sealing sleeve 18, and the isolation ring 16 form a sealing structure between the push rod 6 and the partition 10, preventing foreign matter from falling into the internal space of the contactor 1 through the gap between the push rod 6 and the partition 10 and affecting the normal actuation of the push rod 6. Of course, it is also feasible to provide only one of the first sealing sleeve 17 and the second sealing sleeve 18. It should be noted that, in this embodiment, the shape of the sealing contact between the first sealing contact section and the second sealing contact section and the cylindrical body 161 can be a circular arc protrusion as shown in the figure, or a step protrusion with a certain height, so that the "line" in the above-mentioned line and surface sealing structure can include the meaning of a line with a certain width.

[0057] In this embodiment, the first sealing sleeve 17 and the second sealing sleeve 18 are both made of a rigid material with elastic force and elastic deformation capability, such as a metal material such as stainless steel. Because the first sealing sleeve 17 and the second sealing sleeve 18 respectively clamp the isolation ring 16 from the inside and outside, the first sealing sleeve 17 and the second sealing sleeve 18 can always remain in contact with the isolation ring 16 when the push rod 6 moves, thereby enhancing the sealing performance. In this embodiment, the first sealing sleeve 17 and the second sealing sleeve 18 are provided to realize a clamping structure for clamping the inner and outer wall surfaces of the cylindrical body 161. The clamping structure guides the push rod 6 during the sliding stroke, thereby providing a guiding function and making the movement of the push rod 6 smoother. In addition, the first sealing sleeve 17 and the second sealing sleeve 18 made of rigid materials can improve durability and reduce the manufacturing cost and maintenance cost of the product.

[0058] In this embodiment, the isolation ring 16 is made of a rigid material, for example, a metal material. Since the first sealing sleeve 17 and the second sealing sleeve 18 are both made of a rigid material with elastic force, and the isolation ring 16 is also made of a rigid material, the first sealing sleeve 17 and the second sealing sleeve 18 clamp the isolation ring 16 from the inside and outside, respectively. The clamping friction between the rigid materials (specifically, metal materials) is smaller, thus reducing the required pushing force of the push rod 6 and making the product more energy-efficient. Furthermore, the friction between the rigid materials (specifically, metal materials) produces virtually no scraping, further improving the cleanliness of the contactor's internal environment and significantly reducing the generation of foreign matter.

[0059] Although this embodiment is described by taking the push rod anti-jamming structure provided in the contactor as an example, the push rod anti-jamming structure has the function of preventing foreign objects from invading the protected space, and can also be used in other types of switching electrical appliances, such as relays.

[0060] Although the present disclosure has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the disclosure without departing from the spirit and scope of the disclosure as defined in the appended claims, all of which are within the scope of protection of the disclosure.

Claims

1. A push rod anti-stuck structure, characterized in that: The push rod anti-stuck structure includes an isolation ring and at least one sealing member, wherein the isolation ring has a cylindrical body, and the direction in which the isolation ring extends along the axis of its cylindrical body is defined as the longitudinal direction; the sealing member is fixedly connected to the push rod, and the sealing member is provided with an extension structure extending along the longitudinal direction of the isolation ring, and the extension structure is sealed with the inner wall surface and / or outer wall surface of the cylindrical body.

2. The push rod anti-stuck structure according to claim 1, characterized in that: The sealing cooperation between the sealing member and the cylindrical body also has a guiding function.

3. The push rod anti-stuck structure according to claim 1, characterized in that: The seal is a sealing sleeve, which includes a base for fixedly connecting to the push rod and a longitudinally extending sealing cylinder portion. The sealing cylinder portion is made of a flexible material with elastic force. The sealing cylinder portion serves as the extension structure and is used to seal with the cylindrical body of the isolation ring. The inner wall surface or outer wall surface of the sealing cylinder portion and the outer wall surface or inner wall surface of the cylindrical body form a surface-to-surface sealing structure, and the surface-to-surface sealing structure is used to guide the seal during the sliding stroke.

4. The push rod anti-stuck structure according to claim 3, characterized in that: The sealing sleeve is fixedly connected to a mounting seat through the base, and the mounting seat is fixedly connected to the push rod, so that the push rod is fixedly connected to the sealing sleeve; the mounting seat has an outer edge, and the outer edge completely covers the range of the cylindrical body of the isolation ring in the radial direction.

5. The push rod anti-stuck structure according to claim 4, characterized in that: The outer edge extends downward to form a lower flange, and the lower flange at least partially covers the outer side of the cylindrical body of the isolation ring, so that multiple seals are achieved among the lower flange, the cylindrical body and the sealing cylindrical portion.

6. The push rod anti-stuck structure according to claim 1, characterized in that: A chamfered portion is formed at an open end of the cylindrical body of the spacer ring.

7. The push rod anti-stuck structure according to claim 1, characterized in that: The sealing member is a sealing sleeve, which is made of a flexible material with elastic force. The sealing sleeve includes a base and a first sealing cylindrical portion and a second sealing cylindrical portion extending longitudinally from the outer edge of the base. The first sealing cylindrical portion and the second sealing cylindrical portion are spaced apart, and the second sealing cylindrical portion is sleeved on the outside of the first sealing cylindrical portion. The cylindrical body of the isolation ring is inserted between the first sealing cylindrical portion and the second sealing cylindrical portion, and multiple seals are formed between the second sealing cylindrical portion, the cylindrical body and the first sealing cylindrical portion.

8. The push rod anti-stuck structure according to claim 1, characterized in that: The sealing member is a sealing sleeve, which includes a base for fixedly connecting with the push rod and a longitudinally extending elastic cylindrical portion. The elastic cylindrical portion includes a sealing contact section arranged at the lower end. The elastic cylindrical portion is made of a rigid material with elastic force. The elastic cylindrical portion serves as the extension structure and is used to seal with the cylindrical body. The sealing contact section at the lower end of the elastic cylindrical portion forms a line and surface sealing structure with the inner wall surface and / or outer wall surface of the cylindrical body.

9. The push rod anti-stuck structure according to claim 8, characterized in that: The sealing sleeve includes a first sealing sleeve and a second sealing sleeve respectively located on the outside and inside of the cylindrical body. The first sealing sleeve and the second sealing sleeve both apply a sealing force toward the cylindrical body to realize a clamping structure for clamping the inner and outer wall surfaces of the cylindrical body, and the clamping structure is used to guide the sealing member during the sliding stroke.

10. A switch electrical appliance, characterized in that: It includes the push rod anti-stuck structure as described in any one of claims 1-9.

11. The switch device according to claim 10, characterized in that: The switching electrical appliance is a contactor, which includes a hollow shell, a magnetic circuit system and a contact system; a partition is provided in the shell, and the partition divides the space in the shell into a first space and a second space, the first space is an arc extinguishing chamber, which is used to install the contact system; the second space is an actuating chamber, which is used to install the magnetic circuit system, the push rod is movably inserted into the partition, and the contact system includes two fixed contacts and a moving contact provided on the shell, the push rod is transmission-connected to the moving contact, and the push rod anti-stuck structure is provided between the push rod and the partition.

12. The switch device according to claim 11, characterized in that: The isolation ring is made of rigid material.

13. The switch device according to claim 11, characterized in that: The push rod is movable relative to the partition along the longitudinal direction.

14. The switch device according to claim 11, characterized in that: The end surface of the partition is concavely provided with a clearance groove, and the clearance groove is used to make way for the sealing member.

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