Vent hole structure of sealed relay and device for closing vent hole

Abstract

The application relates to a vent hole structure of a sealed relay, which comprises a vent hole arranged on a relay shell and a plastic plug matched with the vent hole; the plastic plug comprises a column with the same diameter as the inner diameter of the vent hole and a cap arranged at the rear end of the column and with a diameter larger than the inner diameter of the vent hole; an air passage is arranged in the column; one end of the air passage is communicated with the front end of the column, and the other end is communicated with the outer circumferential surface of the column close to the cap; the vent hole structure of the sealed relay and the device for closing the vent hole can not only conveniently discharge the internal hot air during the glue drying stage of the relay assembly, but also quickly close the vent hole; in the process, high light or high heat is not needed, and the vent hole can be quickly, simply and completely closed by using instantaneous negative pressure and vortex effect, the closing efficiency is obviously improved, the closing effect is good, and the safety of the operators can be ensured.

Description

Technical Field

[0001] This invention relates to the field of electrical components, specifically to a vent structure for a sealed relay and a device for sealing the vent. Background Technology

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled variable in the electrical output circuit when the input quantity changes to a specified value. It establishes an interactive relationship between the control system and the controlled system. Commonly used in automated control circuits, it essentially functions as an "automatic switch" that uses a small current to control a large current. Therefore, it plays roles in automatic adjustment, safety protection, and circuit switching within circuits.

[0003] In the production process of sealed relays, after the housing process is completed, the housing and the base plate or base must be sealed with adhesive. After sealing, drying is carried out. In order to prevent the air inside the relay from expanding due to heat from entering the sealant and forming bubbles after the sealant cures, resulting in poor sealing, vent holes are usually set in the housing, base or base plate of the sealed relay beforehand. During the drying process, the air inside the relay is discharged through the vent holes, and then the vent holes are sealed.

[0004] Current technologies generally use UV adhesive in conjunction with ultraviolet lamps for curing. However, this technology has the following drawbacks: First, to achieve rapid curing and prevent air bursts when sealing vents, UV adhesive is used in conjunction with ultraviolet light, which cures in about 3 seconds. However, UV adhesive is expensive, easily sticks to the dispensing needle during application, and requires regular cleaning of the dispensing head. Second, UV adhesive curing requires ultraviolet lamps, which have high power consumption and can cause physical and mental harm to operators working under them for extended periods. Third, due to the different materials used in the UV adhesive and relay housing, the cured surface of the UV adhesive is relatively hard and may detach when subjected to external impacts, resulting in a weak bond.

[0005] Patent application number 201210497320.3 discloses a vent structure for a sealed relay and a method for sealing the vent. The vent structure is a hollow protruding post on the relay housing. A spotlight is pre-placed above the vent, and a light-shielding plate is pre-placed between the vent and the spotlight. The light-shielding plate has a light-transmitting hole so that the spotlight shines directly on the vent of the relay, and the rest of the parts are not heated by the spotlight. The spotlight has a power of 150W and a focal point between 28 and 32mm. The energy of the spotlight is sufficient to melt the plastic on the surface of the vent in less than one second without generating heat inside the relay. The riveting fixture is pressed down and held for a certain period of time, so that the plastic of the vent self-bonds and forms a shape, thus achieving the purpose of sealing the vent.

[0006] However, this method of sealing the vent has the following problems: First, the strong light emitted by the spotlight causes light pollution and harms the workers' eyes; second, for relays that are white or light-colored, their ability to absorb light is greatly reduced, and the plastic material of the vent cannot reach the melting temperature to complete the sealing.

[0007] Therefore, patent application number 201710366641.2, a heat-melting mechanism for sealing the vent hole of a relay and the method thereof, has been further improved. The nitrogen heater in the nitrogen blowing device heats the nitrogen and then blows the nitrogen to the vent hole protrusion to achieve the effect of sealing the vent hole.

[0008] However, nitrogen needs to be heated to extremely high temperatures to melt the vent protrusion. This process can easily burn operators and other parts of the housing. Furthermore, the high-temperature nitrogen blown into the relay through the vent can easily damage other internal components and structures, especially low-melting-point plastic parts, rubber parts, or solder. In addition, since high-temperature nitrogen heating is done from the outside in, the heating time is still relatively long. Summary of the Invention

[0009] To address the aforementioned problems in the existing technology, this invention provides a vent structure for a sealed relay and a device for sealing the vent. This vent structure and device not only facilitate the discharge of internal hot air during the glue-drying stage of relay assembly, but also quickly seal the vent. In this process, high-intensity light or high-heat air is not required; the vent can be quickly, simply, and completely sealed using instantaneous negative pressure and eddy current effect, significantly improving sealing efficiency, providing a good sealing effect, and ensuring the safety of operators.

[0010] The technical solution of the present invention is as follows:

[0011] A vent structure for a sealed relay includes a vent on the relay housing and a plastic plug that can be inserted into the vent. The plastic plug includes a column with the same diameter as the inner diameter of the vent and a cap with a diameter larger than the inner diameter of the vent, located at the rear end of the column. An air passage is provided in the column. One end of the air passage extends from the front end of the column, and the other end extends from the outer circumferential surface of the column near the cap.

[0012] The ventilation hole includes a narrow hole near the outer end face of the shell and inserted into the column, and an inner countersunk hole near the inner end face of the shell with an inner diameter larger than the outer diameter of the cap; the outer end face of the shell is provided with an annular countersunk hole around the narrow hole.

[0013] The column has a built-in annular metal conductor near its front end.

[0014] The annular metal conductor is simultaneously encapsulated during the injection molding of the plastic plug.

[0015] The air passages are symmetrically distributed around the central axis of the cylinder, with the air inlet extending from the outer circumferential surface of the cylinder near the cap.

[0016] A device for sealing the vent hole of a relay, applied to the vent hole structure of the sealed relay, includes an annular head and an air intake nozzle; the annular head can be inserted into an annular countersunk hole; the air intake nozzle is disposed in the rear part of the cavity enclosed by the annular head; a conductor ring is embedded in the annular head; the conductor ring carries alternating current; the air intake nozzle is connected to an external air extraction device; the external air extraction device uses pulse instantaneous air extraction.

[0017] The annular head body is made of rigid insulating material, and its ends are made of deformable sealing material.

[0018] The rigid insulating material is plastic, and the deformation sealing material is silicone or rubber.

[0019] The relay can be placed on a tooling fixture in a fixed position, and the mechanism is pushed and extended by a cylinder so that the annular head can be inserted into the annular countersunk hole.

[0020] The method for sealing the vent holes of the aforementioned mechanism includes the following steps:

[0021] ① Before assembling the relay housing, insert the plastic plug into the narrow hole from the inside out through the inner countersunk hole. The insertion depth should be such that the air passage can connect the inside and outside.

[0022] ② After applying glue and installing the back cover, the relay is dried. During the drying process, the heated air inside the relay can be discharged through the air passage.

[0023] ③ After the relay cools down, when it is necessary to seal the vent hole, place the relay on the tooling fixture to make the position of the vent hole uniform. Move the cylinder drive mechanism forward so that the annular head can be inserted and squeezed into the annular countersunk hole. The deformation sealing material at the end of the annular head ensures that there is no air leakage between the annular head and the annular countersunk hole.

[0024] ④ The external air extraction device quickly draws air outward through the suction nozzle in a pulse. Under the instantaneous negative pressure, the plastic plug is pushed outward by the air inside the relay, so that the column is completely inserted into the narrow hole and the air passage is sealed by the inner wall of the narrow hole.

[0025] ⑤ The external circuit supplies a high-frequency alternating current to the conductor coil. At this time, the annular metal conductor, which is located within the enclosure of the conductor coil, is rapidly heated at an extremely fast speed through the eddy current effect, melting the surrounding pillars and causing the pillars and narrow holes to fuse together, thereby completely sealing the vent hole.

[0026] The present invention has the following beneficial effects:

[0027] 1. This invention not only facilitates the discharge of internal hot air during the glue drying stage of relay assembly, but also quickly seals the vent holes. In this process, high-intensity light or high-heat air is not required. The vent holes can be quickly, simply, and completely sealed by using instantaneous negative pressure and eddy current effect, which can significantly improve sealing efficiency, provide good sealing effect, and ensure the safety of operators.

[0028] 2. This invention utilizes a plastic plug, cleverly designing a narrow orifice, an inner countersunk hole, and the structure of the plastic plug itself. This not only allows the plastic plug to allow airflow when needed, but also allows it to instantly block the vent hole using a simple instantaneous negative pressure, thus cutting off the airflow between the inside and outside. Furthermore, the plastic plug only needs to have its surface melted to achieve fusion with the inner wall of the narrow orifice. Most areas can be sealed by the structure of the plastic plug itself, thus avoiding the need to completely melt the protruding post to seal the vent hole as required in the prior art. This not only results in faster sealing speed, but also, when combined with the annular metal conductor that is injection molded together during the injection molding stage, the eddy current effect can be used to melt the surface of the plastic plug extremely quickly and fuse it evenly with the vent hole. This results in fast sealing speed, good sealing effect, and a smooth and aesthetically pleasing seal.

[0029] 3. This invention specifically designs a device for sealing the vent holes for the novel vent structure. The device is simple, compact, low-cost, easy to operate, and safe. It can quickly achieve the insertion and compression of the annular head and the annular countersunk hole, thereby forming a sealed space outside the vent hole. Then, the suction nozzle instantly draws air to create negative pressure, which completely seals the vent hole with the plastic plug. At the same time, the conductor ring integrated on the annular head can quickly heat the annular metal conductor in the air using the eddy current effect, thereby achieving spontaneous heat-melting sealing. This process is not only fast but also highly efficient in its application area, without damaging other areas of the shell, and can ensure the safety of the operator. It is also very easy to automate, with low technical requirements and low cost. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the relay of the present invention;

[0031] Figure 2 This is a schematic diagram of the air vent structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the plastic embolism of the present invention;

[0033] Figure 4 This is a schematic diagram of the insertion of the plastic plug and the vent hole of the present invention in an unsealed state;

[0034] Figure 5This is a schematic diagram of the insertion of the plastic plug and the vent hole in the closed state according to the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the device for sealing the vent hole of the relay according to the present invention;

[0036] Figure 7 This is a schematic diagram of the device for sealing the relay vent hole of the present invention when it is just inserted into the annular countersunk hole.

[0037] Figure 8 This is a schematic diagram of the device for sealing the vent hole of the relay according to the present invention, in which the plastic plug completely seals the vent hole.

[0038] The reference numerals in the figure are as follows:

[0039] 1. Shell; 11. Narrow hole; 12. Inner countersunk hole; 2. Vent hole; 3. Plastic plug; 31. Column; 311. Air passage; 312. Annular metal conductor; 32. Cap; 4. Annular countersunk hole; 5. Annular head; 6. Intake nozzle; 7. Conductor ring. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] See Figures 1 to 8 A vent structure for a sealed relay includes a vent 2 disposed on a relay housing 1 and a plastic plug 3 that can be inserted into the vent 2; the plastic plug 3 includes a column 31 with the same diameter as the inner diameter of the vent 2 and a cap 32 disposed at the rear end of the column 31 with a diameter larger than the inner diameter of the vent 2; an air passage 311 is disposed inside the column 31; one end of the air passage 311 extends out from the front end of the column 31, and the other end extends out from the outer circumferential surface of the column 31 near the cap 32.

[0042] Furthermore, the vent 2 includes a narrow hole 11 near the outer end face of the housing 1 and inserted into the column 31, and an inner countersunk hole 12 near the inner end face of the housing 1 and with an inner diameter larger than the outer diameter of the cap 32; the outer end face of the housing 1 is provided with an annular countersunk hole 4 around the narrow hole 11.

[0043] Furthermore, a ring-shaped metal conductor 312 is built into the column 31 near its front end.

[0044] Furthermore, the annular metal conductor 312 is simultaneously incorporated during the injection molding of the plastic plug 3.

[0045] Furthermore, the air passage 311 is symmetrically distributed around the central axis of the column 31, with the air inlet extending from the outer circumferential surface of the column 31 near the cap 32.

[0046] A device for sealing the vent hole of a relay, applied to the vent hole structure of the sealed relay, includes an annular head 5 and a suction nozzle 6; the annular head 5 can be inserted into an annular countersunk hole 4; the suction nozzle 6 is disposed in the rear part of the cavity enclosed by the annular head 5; a conductor ring 7 is embedded in the annular head 5; the conductor ring 7 carries alternating current; the suction nozzle 6 is connected to an external suction device; the external suction device uses pulse instantaneous suction.

[0047] Furthermore, the main body of the annular head 5 is made of rigid insulating material, and its ends are made of deformable sealing material.

[0048] Furthermore, the rigid insulating material is plastic, and the deformation sealing material is silicone or rubber.

[0049] Furthermore, the relay can be placed on a tooling fixture in a fixed position, and the mechanism is pushed and extended by a cylinder so that the annular head 5 is just inserted into the annular countersunk hole 4.

[0050] Furthermore, the method for sealing the vent holes of the aforementioned mechanism includes the following steps:

[0051] ①See Figure 4 Before assembling the relay housing, insert the plastic plug 3 from the inside out through the inner countersunk hole 12 into the narrow hole 11, with the insertion depth determined by the air passage 311 being able to connect the inside and outside.

[0052] ② After applying glue and installing the back cover, the relay is dried. During the drying process, the heated air inside the relay can be discharged through the air passage 311.

[0053] ③See Figure 7 After the relay cools down, when it is necessary to seal the vent hole 2, place the relay on the tooling fixture to make the position of the vent hole 2 uniform. Move the cylinder drive mechanism forward so that the annular head 5 can be inserted and squeezed into the annular countersunk hole 4. The deformation sealing material at the end of the annular head 5 ensures that there is no air leakage between the annular head 5 and the annular countersunk hole 4.

[0054] ④See Figure 8 The external air extraction device quickly draws air outward through the suction nozzle 6. Under the instantaneous negative pressure, the plastic plug 3 is pushed outward by the air inside the relay, so that the column 31 is completely inserted into the narrow hole 11 and the air passage 311 is sealed by the inner wall of the narrow hole 11.

[0055] ⑤ The external circuit supplies high-frequency alternating current to the conductor ring 7. At this time, the annular metal conductor 312, which is located within the enclosure of the conductor ring 7, is rapidly heated at an extremely fast speed through the eddy current effect, melting the surrounding pillar 31, so that the pillar 31 and the narrow hole 11 are fused together, thereby completely sealing the vent hole 2.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A vent structure for a sealed relay, characterized in that: It includes a vent (2) provided on the relay housing (1) and a plastic plug (3) that can be inserted into the vent (2); The ventilation hole (2) includes a narrow hole (11) near the outer end face of the shell (1) and inserted into the column (31) and an inner countersunk hole (12) near the inner end face of the shell (1) and with an inner diameter larger than the outer diameter of the cap (32); the outer end face of the shell (1) is provided with an annular countersunk hole (4) around the narrow hole (11); The plastic plug (3) includes a column (31) with the same diameter as the inner diameter of the narrow hole (11) and a cap (32) located at the rear end of the column (31) with a diameter greater than the inner diameter of the narrow hole (11); An air passage (311) is provided inside the column (31); one end of the air passage (311) is open from the front end of the column (31), and the other end is open from the outer circumferential surface of the column (31) near the cap (32); The column (31) has an annular metal conductor (312) built into it near the front end, and the annular metal conductor (312) is simultaneously encased in the plastic plug (3) during injection molding.

2. The vent structure of a sealed relay as described in claim 1, characterized in that: The air passage (311) is symmetrically distributed around the central axis of the column (31) with the air inlet extending from the outer circumference of the column (31) near the cap (32).

3. A device for sealing the vent hole of a relay, characterized in that: The vent structure applied to the sealed relay of claim 1 includes an annular head (5) and an air intake (6); The annular head (5) can be inserted into the annular countersunk hole (4); the suction nozzle (6) is located in the rear part of the cavity enclosed by the annular head (5); The annular head (5) is embedded with a conductor ring (7); the conductor ring (7) carries a high-frequency alternating current; The suction nozzle (6) is connected to an external suction device; the external suction device uses pulse instantaneous suction.

4. The device for sealing the vent hole of a relay as described in claim 3, characterized in that: The main body of the annular head (5) is made of rigid insulating material, and its ends are made of deformable sealing material.

5. The device for sealing the vent hole of a relay as described in claim 4, characterized in that: The rigid insulating material is plastic, and the deformation sealing material is silicone or rubber.

6. The device for sealing the vent hole of a relay as described in claim 3, characterized in that: The relay can be placed on a tooling fixture in a fixed position. The device is pushed and extended by a cylinder so that the annular head (5) fits into the annular countersunk hole (4).

7. A method for sealing the vent hole of a relay, characterized in that: The device for sealing the vent hole of the relay as described in claim 3 includes the following steps: ① Before assembling the relay housing, insert the plastic plug (3) from the inside out through the inner countersunk hole (12) into the narrow hole (11). The insertion depth should be such that the air passage (311) can connect the inside and outside. ② After applying glue and installing the back cover, the relay is dried. During the drying process, the heated air inside the relay can be discharged through the air passage (311). ③ After the relay cools down, when it is necessary to seal the vent hole (2), place the relay on the tooling fixture to make the position of the vent hole (2) uniform. Move the cylinder drive device forward so that the annular head (5) can be inserted and squeezed into the annular countersunk hole (4). The deformation sealing material at the end of the annular head (5) ensures that there is no air leakage between the annular head (5) and the annular countersunk hole (4). ④ The external air extraction device quickly draws air outward through the air inlet (6). Under the instantaneous negative pressure, the plastic plug (3) is pushed outward by the air inside the relay, so that the column (31) is completely inserted into the narrow hole (11) and the air passage (311) is sealed by the inner wall of the narrow hole (11). ⑤ The external circuit supplies high-frequency alternating current to the conductor ring (7), and at this time the annular metal conductor (312) which is located within the enclosure of the conductor ring (7) is rapidly heated by the eddy current effect, melting the surrounding column (31), so that the column (31) and the narrow hole (11) are fused together, thereby completely sealing the vent hole (2).

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