Plastic sealing type relay with higher temperature resistance

Abstract

The utility model discloses a more temperature-resistant plastic sealing type relay. The more temperature-resistant plastic sealing type relay comprises a plastic sealing type relay body, the plastic sealed relay body is provided with a first shell; the device is characterized by further comprising a second shell, wherein the second shell is provided with an opening part; the plastic sealing type relay body is arranged in the second shell through the opening part of the second shell, and a lead-out pin of the plastic sealing type relay body extends out of the opening part; and a sealing structure is arranged between the opening part of the second shell and the plastic sealing type relay body, so that an airtight cavity is formed between the first shell and the second shell of the plastic sealing type relay body. According to the utility model, the first housing of the plastic sealing type relay body can be prevented from bulging and deforming in a high-temperature environment, and the problem that the air tightness of the plastic sealing type relay body is reduced due to thermal stress is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a plastic-sealed relay with better heat resistance. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually applied to an automatic control circuit. In fact, it is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] Currently, for a plastic-sealed relay, as Figure 1 shown, the relay movement 2' is mainly placed into the housing 1', and then the airtightness requirement of the relay is achieved through dotting and plastic encapsulation. However, this method has the following problems: Since the interior of the plastic-sealed relay is a closed cavity, under thermal stress (such as the soldering heat during the installation of a PCB relay), the gas inside the relay is heated and the pressure becomes larger, and then the product expands, resulting in cracking at the joints between the housing 1' and the glue 3', and between the pin 21' and the glue 3', causing the airtightness of the plastic-sealed relay to decline. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a plastic-sealed relay with better heat resistance, which can avoid the outer bulge and deformation of the first housing of the plastic-sealed relay body in a high-temperature environment, and improve the problem that the airtightness of the plastic-sealed relay body decreases due to thermal stress.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a plastic-sealed relay with better heat resistance, including a plastic-sealed relay body; the plastic-sealed relay body has a first housing; it further includes a second housing, and the second housing has an opening; the plastic-sealed relay body is inserted into the second housing through the opening of the second housing, and the lead-out pins of the plastic-sealed relay body extend out of the opening; a sealing structure is provided between the opening of the second housing and the plastic-sealed relay body, so that an airtight cavity is formed between the first housing and the second housing of the plastic-sealed relay body.

[0006] A step is provided inside the opening of the second housing, and a corresponding sealing structure is formed between the plastic-sealed relay body and the step of the second housing by means of sealant or ultrasonic welding.

[0007] The first housing of the plastic-sealed relay body is provided with a rib surrounding the periphery at a position corresponding to the mouth of the second housing. When the plastic-sealed relay body is inserted into the second housing, the rib of the plastic-sealed relay body is placed on the step of the second housing; a corresponding sealing structure is formed between the rib of the plastic-sealed relay body and the step of the second housing by means of sealant or ultrasonic welding.

[0008] The sealing structure is a whole layer of sealant layer covering the mouth of the second housing.

[0009] The sealing structure is a sealant structure only covering the rib of the plastic-sealed relay body and the contact position between the rib and the second housing.

[0010] The sealing structure is a sealing tape between the first housing and the second housing of the plastic-sealed relay body arranged in a ring near the mouth of the second housing.

[0011] The second housing is further provided with a positioning structure for the plastic-sealed relay body, so that an airtight cavity is formed between the bottom surface of the first housing and the second housing of the plastic-sealed relay body and / or between the four side walls.

[0012] At the four corners of the bottom surface of the second housing, there are bosses serving as the positioning structure. The plastic-sealed relay body inserted into the second housing is placed on the bosses, so that an airtight cavity is formed between the bottom surface of the first housing and the second housing of the plastic-sealed relay body.

[0013] On the four side surfaces around the second housing, there are also rib strips serving as the positioning structure. The side surface of the plastic-sealed relay body inserted into the second housing abuts against the rib strips, so that an airtight cavity is formed between the first housing and the four side walls of the second housing of the plastic-sealed relay body.

[0014] In the second housing, there is also a closable air vent.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] 1. In the present utility model, the plastic-sealed relay body is inserted into the second housing through the opening of the second housing, and the lead-out pins of the plastic-sealed relay body extend out of the opening. A sealing structure is provided between the opening of the second housing and the plastic-sealed relay body, so that an airtight cavity is formed between the first housing and the second housing of the plastic-sealed relay body, that is, a hollow airtight cavity is formed between the second housing and the plastic-sealed relay body. Since both the inside of the plastic-sealed relay body and the airtight cavity are closed cavities, when subjected to external thermal stress, air is a good heat-insulating material, so the temperature of the airtight cavity is always higher than that inside the plastic-sealed relay body. Since the pressure in the airtight cavity is only related to the temperature, the pressure in the airtight cavity is always higher than that inside the plastic-sealed relay body, that is, the force exerted by the gas in the airtight cavity on the first housing of the plastic-sealed relay body inward is always greater than the force exerted by the gas inside the plastic-sealed relay body outward. Thus, it is possible to prevent the first housing of the plastic-sealed relay body from bulging and deforming in a high-temperature environment, and improve the problem that the airtightness of the plastic-sealed relay body 1 decreases due to thermal stress.

[0017] 2. In the present utility model, the first housing of the plastic-sealed relay body is provided with a surrounding rib at the position corresponding to the opening of the second housing, and a step is provided on the inner side of the opening of the second housing; or, the second housing is further provided with a positioning structure for the plastic-sealed relay body, so as to ensure that an airtight cavity is formed between the plastic-sealed relay body and the second housing, and its structure is simple and easy to implement.

[0018] 3. In the present utility model, the sealing structure is a whole layer of sealant layer covering the opening of the second housing, so as to strengthen the bonding strength between the first housing of the plastic-sealed relay body and the glue, and between the pins and the glue.

[0019] 4. In the present utility model, in the second housing, a closable vent hole is further provided. With this structure of the present utility model, when the pressure of the gas inside the plastic-sealed relay body becomes larger due to heat, the gas in the airtight cavity can be discharged through the vent hole, ensuring the reliability of the sealing structure at the opening.

[0020] The present utility model will be further described in detail below in conjunction with the drawings and embodiments; however, the more temperature-resistant plastic-sealed relay of the present utility model is not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of a plastic-sealed relay in the prior art;

[0022] Figure 2 is a three-dimensional structural schematic diagram of Embodiment 1 of the present utility model;

[0023] Figure 3 is a schematic three-dimensional structure diagram of the first embodiment of the present utility model (with the bottom surface flipped upwards);

[0024] Figure 4 is a schematic cross-sectional view of the first embodiment of the present utility model;

[0025] Figure 5 is Figure 4 an enlarged schematic view of part A of;

[0026] Figure 6 is a bottom view of the plastic-sealed relay body of the first embodiment of the present utility model;

[0027] Figure 7 is a schematic three-dimensional structure diagram of the second housing of the first embodiment of the present utility model (with the bottom surface flipped upwards);

[0028] Figure 8 is a schematic cross-sectional view of the second embodiment of the present utility model;

[0029] Figure 9 is a schematic cross-sectional view of the third embodiment of the present utility model;

[0030] Figure 10 is a schematic cross-sectional view of the fourth embodiment of the present utility model (excluding the sealing structure);

[0031] Figure 11 is a schematic three-dimensional structure diagram of the second housing of the fourth embodiment of the present utility model (with the bottom surface flipped upwards);

[0032] Figure 12 is a schematic cross-sectional view of the second housing of the fourth embodiment of the present utility model;

[0033] Figure 13 is a schematic three-dimensional structure diagram of the plastic-sealed relay body of the fourth embodiment of the present utility model (with the bottom surface flipped upwards);

[0034] Figure 14 is a front view of the plastic-sealed relay body of the fourth embodiment of the present utility model (with the bottom surface flipped upwards);

[0035] Figure 15 is a schematic cross-sectional view of the fifth embodiment of the present utility model;

[0036] Figure 16 is a schematic three-dimensional structure diagram of the second housing of the sixth embodiment of the present utility model (with the bottom surface flipped upwards). Detailed implementation manners

[0037] Embodiment 1

[0038] Refer to Figures 2 to 7As shown, the more heat-resistant plastic-sealed relay of the present utility model includes a plastic-sealed relay body 1; the plastic-sealed relay body 1 has a first outer shell 11; it further includes a second outer shell 2, and the second outer shell 2 has an opening 21; the plastic-sealed relay body 1 is inserted into the second outer shell 2 through the opening 21 of the second outer shell 2, and the lead-out pins 12 of the plastic-sealed relay body 1 extend out of the opening 21; a sealing structure is provided between the opening 21 of the second outer shell 2 and the plastic-sealed relay body 1, so that an airtight cavity 3 is formed between the first outer shell 11 and the second outer shell 2 of the plastic-sealed relay body 1.

[0039] In this embodiment, the sealing structure is a whole-layer sealant layer 41 covering the opening 21 of the second outer shell 2.

[0040] In this embodiment, the second outer shell 2 is further provided with a positioning structure for the plastic-sealed relay body 1, so that an airtight cavity 3 is formed between the bottom surface of the first outer shell 11 of the plastic-sealed relay body 1 and the second outer shell 2, and between the four side walls.

[0041] Specifically, at the four corners of the bottom surface of the second outer shell 2, there are further provided bosses 22 as a positioning structure, and the plastic-sealed relay body 1 inserted into the second outer shell 2 is placed on the bosses 22, so that an airtight cavity 3 corresponding to that between the bottom surface of the first outer shell 11 of the plastic-sealed relay body 1 and the second outer shell 2 is formed. On the four side surfaces around the second outer shell 2, there are further provided ribs 23 as a positioning structure, and the side surface of the plastic-sealed relay body 1 inserted into the second outer shell 2 abuts against the ribs 23, so that an airtight cavity 3 corresponding to that between the first outer shell 11 of the plastic-sealed relay body 1 and the four side walls of the second outer shell 2 is formed.

[0042] In this embodiment, in the second outer shell 2, there is further provided a closable vent hole 24.

[0043] The more heat-resistant plastic-sealed relay of the present utility model is such that the plastic-sealed relay body 1 is inserted into the second housing 2 through the mouth 21 of the second housing 2, and the lead-out pins 12 of the plastic-sealed relay body 1 extend out of the mouth 21. A sealing structure is provided between the mouth 21 of the second housing 2 and the plastic-sealed relay body 1, so that an airtight cavity 3 is formed between the first housing 11 of the plastic-sealed relay body 1 and the second housing 2, that is, a hollow airtight cavity 3 is formed between the second housing 2 and the plastic-sealed relay body 1. Since both the interior of the plastic-sealed relay body 1 and the airtight cavity 3 are closed cavities, when subjected to external thermal stress, air is a good heat-insulating material, so the temperature of the airtight cavity 3 is always higher than that inside the plastic-sealed relay body 1. Since the pressure in the airtight cavity 3 is only related to the temperature, the pressure in the airtight cavity 3 is always higher than that inside the plastic-sealed relay body 1, that is, the force exerted by the gas in the airtight cavity 3 on the first housing 11 of the plastic-sealed relay body 1 inward is always greater than the force exerted by the gas inside the plastic-sealed relay body 1 outward. Thus, it is possible to prevent the first housing 11 of the plastic-sealed relay body 1 from bulging and deforming in a high-temperature environment, and the problem of the decline in airtightness of the plastic-sealed relay body 1 caused by thermal stress is improved.

[0044] For the more heat-resistant plastic-sealed relay of the present utility model, the second housing 2 is further provided with a positioning structure for the plastic-sealed relay body 1, so as to ensure that an airtight cavity 3 is formed between the plastic-sealed relay body 1 and the second housing 2, and its structure is simple and easy to implement.

[0045] Since the present utility model adopts the sealing structure as a whole layer of sealant layer 41 covering the mouth 21 of the second housing 2, the bonding strength between the first housing 11 of the plastic-sealed relay body 1 and the glue, and between the lead pins 12 and the glue can be enhanced.

[0046] For the more heat-resistant plastic-sealed relay of the present utility model, in the second housing 2, a closable vent hole 24 is further provided. With this structure of the present utility model, when the pressure of the gas inside the plastic-sealed relay body 1 increases due to heat, the gas in the airtight cavity 3 can be discharged through the vent hole 24, ensuring the reliability of the sealing structure at the mouth 21.

[0047] Embodiment 2

[0048] See Figure 8As shown, the more heat-resistant plastic-sealed relay of the present utility model is different from that of the first embodiment in that a step 27 is provided inside the mouth 21 of the second housing 2, and the sealing structure is a sealing tape 42 provided between the first housing 1 and the second housing 2 of the plastic-sealed relay body 1 arranged in a ring near the mouth 21 of the second housing 2. Specifically, the sealing tape 42 is located at the edge of the step 27 close to the plastic-sealed relay body 1.

[0049] Embodiment III

[0050] See Figure 9 As shown, the more heat-resistant plastic-sealed relay of the present utility model is different from that of the first embodiment in that a step 28 is provided inside the mouth 21 of the second housing 2, and the sealing structure is a whole-layer sealing glue layer 43 covering the step 28.

[0051] Embodiment IV

[0052] See Figures 10 to 14 As shown, the more heat-resistant plastic-sealed relay of the present utility model is different from that of the first embodiment in that a step 25 is provided inside the mouth 21 of the second housing 2, and a corresponding sealing structure is formed between the plastic-sealed relay body 1 and the step 25 of the second housing 2 by means of sealing glue or ultrasonic welding. A rib 111 surrounding the periphery is provided at the position of the first housing 11 of the plastic-sealed relay body 1 corresponding to the mouth 21 of the second housing 2. When the plastic-sealed relay 1 body is inserted into the second housing 2, the rib 111 of the plastic-sealed relay body 1 is placed on the step 25 of the second housing 2.

[0053] For the more heat-resistant plastic-sealed relay of the present utility model, a rib 111 surrounding the periphery is provided at the position of the first housing 11 of the plastic-sealed relay body 1 corresponding to the mouth 21 of the second housing 2, and a step 25 is provided inside the mouth 21 of the second housing 2, so as to ensure that an airtight cavity 3 is formed between the plastic-sealed relay body 1 and the second housing 2, and the structure is simple and easy to implement.

[0054] Embodiment V

[0055] See Figure 15 As shown, the more heat-resistant plastic-sealed relay of the present utility model is different from that of the fourth embodiment in that the sealing structure is a sealing glue structure 44 covering only the rib 111 of the plastic-sealed relay body 1 and the contact position between the rib 111 and the second housing 2.

[0056] Embodiment VI

[0057] See Figure 16As shown, the more temperature-resistant plastic-sealed relay of the present utility model is different from that of the first embodiment in that a wavy structure 26 is provided inside the mouth of the second housing 2 to ensure that the glue can better flow into the space between the second housing 2 and the first housing 11 of the plastic-sealed relay body 1, and the mating surface is wavy, increasing the contact area between the glue and the second housing 2. At the same time, the bonding force between the two changes from a single direction to multiple directions, which can strengthen the bonding strength between the plastic-sealed relay body 1 and the second housing.

[0058] The above is only the preferred embodiment of the present utility model and does not impose any formal restrictions on the present utility model. Although the present utility model has been disclosed above with the preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the above-disclosed technical content, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A more temperature-resistant plastic-sealed relay, comprising a plastic-sealed relay body; the plastic-sealed relay body has a first housing; characterized in that: It further includes a second housing which has an opening; the plastic-sealed relay body is inserted into the second housing through the opening of the second housing, and the lead-out pins of the plastic-sealed relay body extend out of the opening; a sealing structure is provided between the opening of the second housing and the plastic-sealed relay body, so that an airtight cavity is formed between the first housing and the second housing of the plastic-sealed relay body.

2. The more temperature-resistant plastic-sealed relay according to claim 1, characterized in that: A step is provided inside the opening of the second housing, and a corresponding sealing structure is formed between the plastic-sealed relay body and the step of the second housing by means of sealant or ultrasonic welding.

3. The more temperature-resistant plastic-sealed relay according to claim 2, wherein: The first housing of the plastic-sealed relay body is provided with a rib surrounding the periphery at a position corresponding to the opening of the second housing. When the plastic-sealed relay body is inserted into the second housing, the rib of the plastic-sealed relay body is placed on the step of the second housing; a corresponding sealing structure is formed between the rib of the plastic-sealed relay body and the step of the second housing by means of sealant or ultrasonic welding.

4. The more temperature-resistant plastic-sealed relay according to claim 1 or 2 or 3, characterized in that: The sealing structure is a whole layer of sealant layer covering the opening of the second housing.

5. The more temperature-resistant plastic-sealed relay according to claim 3, wherein: The sealing structure is a sealant structure only covering the rib of the plastic-sealed relay body and the contact position between the rib and the second housing.

6. The more temperature-resistant plastic-sealed relay according to claim 1, characterized in that: The sealing structure is a sealing tape between the first housing and the second housing of the plastic-sealed relay body which is arranged in a ring near the opening of the second housing.

7. The more temperature-resistant plastic-sealed relay according to claim 1 or 2 or 3, characterized in that: The second housing is further provided with a positioning structure for the plastic-sealed relay body, so that an airtight cavity is formed between the bottom surface and / or the four side walls of the first housing and the second housing of the plastic-sealed relay body.

8. The more temperature-resistant plastic-sealed relay according to claim 7, wherein: At the four corners of the bottom surface of the second housing, there are bosses as the positioning structure. The plastic-sealed relay body inserted into the second housing is placed on the bosses, so that an airtight cavity corresponding to that is formed between the bottom surface of the first housing and the second housing of the plastic-sealed relay body.

9. The more temperature-resistant plastic-sealed relay according to claim 7, wherein: On the four side surfaces around the second housing, there are also rib strips as the positioning structure. The side surface of the plastic-sealed relay body inserted into the second housing abuts against the rib strips, so that an airtight cavity corresponding to that is formed between the first housing and the four side walls of the second housing of the plastic-sealed relay body.

10. The more temperature-resistant plastic-sealed relay according to claim 7, characterized in that: In the second housing, there is also a closable air vent.

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