Internet of Things controller
By designing interconnected heat sinks in the IoT controller to form a heat dissipation channel and using high-strength engineering plastic materials, the problem of insufficient heat dissipation of the circuit board is solved, achieving more efficient heat dissipation and electromagnetic interference suppression.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN MEGMEET ELECTRICAL CO LTD
- Filing Date
- 2025-04-09
- Publication Date
- 2026-04-21
AI Technical Summary
The heat dissipation performance of the internal circuit boards of existing IoT controllers needs to be improved.
An Internet of Things (IoT) controller was designed, which uses a housing with a first heat sink and a second heat sink connected to form a heat dissipation channel. The control circuit board is located in the heat dissipation channel, and airflow carries away heat through the heat dissipation channel. The electronic components on the control circuit board are located in the gas flow path. The housing is made of high-strength engineering plastic material to reduce electromagnetic interference.
It improves the heat dissipation efficiency of the control circuit board, enhances the heat dissipation effect of natural convection and forced convection, and reduces the impact of electromagnetic interference on the internal circuit.
Smart Images

Figure CN224154505U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of controller technology, and in particular to an Internet of Things (IoT) controller. Background Technology
[0002] With the advancement of the information age, the importance of the Internet of Things (IoT) is becoming increasingly prominent. The IoT empowers objects with intelligence by deploying chips and software, enabling them to sense and execute actions. It also facilitates data transmission and communication between objects via network connections, giving all objects network connectivity. IoT controllers are essential tools for controlling backend devices after collecting IoT sensor information. They are primarily used in smart agriculture, smart transportation, smart healthcare, smart elderly care, smart industry, smart homes, smart fire protection, smart emergency response, smart transportation, environmental protection, and public safety, among other fields.
[0003] In the process of realizing this application, the inventors discovered that the internal circuit board of the IoT controller in the related technology still needs to be improved in terms of heat dissipation. Utility Model Content
[0004] In view of the above problems, embodiments of this application provide an Internet of Things controller that overcomes or at least partially solves the above problems.
[0005] According to one aspect of this application, an Internet of Things (IoT) controller is provided, including a housing, a receiving cavity, and a first heat dissipation groove and a second heat dissipation groove communicating with the receiving cavity. The first heat dissipation groove and the second heat dissipation groove are disposed opposite each other along a first direction, and the first heat dissipation groove and the second heat dissipation groove communicate with each other along the first direction to form a heat dissipation channel. One of the first heat dissipation groove and the second heat dissipation groove is an air inlet, and the other is an air outlet. A control circuit board is disposed in the receiving cavity, the control circuit board is located in the heat dissipation channel, and the electronic components on the control circuit board are located in the gas flow path of the heat dissipation channel. The thickness extension direction of the control circuit board is parallel to a second direction, and the second direction is perpendicular to the first direction.
[0006] In one alternative embodiment, there are multiple first heat dissipation slots, which are spaced apart vertically; there are also multiple second heat dissipation slots, which are spaced apart vertically; and the number of first heat dissipation slots corresponds to the number of second heat dissipation slots.
[0007] In one alternative embodiment, the outer wall of the housing is provided with a mounting groove and a mounting slide groove communicating with the mounting groove, the mounting groove being used to engage with an external guide rail; the IoT controller further includes a latch, the latch being disposed within the mounting slide groove, and the latch being slidable within the mounting slide groove along the first direction, the housing being locked onto the external guide rail when the latch slides within the mounting slide groove to abut against the external guide rail, and the housing being de-locked onto the external guide rail when the latch slides within the mounting slide groove to no longer abut against the external guide rail.
[0008] In one alternative embodiment, the latch includes a lock body and a latch. The lock body has a mounting cavity communicating with the mounting groove. The latches are disposed on the two side walls of the mounting cavity along the second direction. The two latches are positioned opposite each other and spaced apart along the second direction. The distance between the two latches gradually decreases along the first direction. The housing also has a locking block located at the bottom of the mounting groove. When the lock body moves to a preset position along the first direction, the two latches engage with the locking block, which is located between the two latches.
[0009] In one alternative embodiment, the lock body is provided with limiting grooves on both sides along the second direction, and the limiting grooves extend along the first direction; the mounting groove is provided with a first limiting protrusion on its side wall along the second direction, and the first limiting protrusion is at least partially installed in the limiting groove.
[0010] In one alternative embodiment, a limiting portion is provided at one end of the lock body away from the mounting groove, and when the lock body moves to a preset position along the first direction, the limiting portion abuts against the first limiting protrusion.
[0011] In one optional embodiment, the external guide rail is provided with insertion slots on both sides along the first direction; along the first direction, a second limiting protrusion is provided on the side wall of the mounting groove opposite to the mounting slide groove, and the second limiting protrusion is inserted into the insertion slot on one side of the external guide rail; the lock body is provided with an insertion part at one end near the mounting groove, and when the latch slides in the mounting slide groove to abut against the external guide rail, the insertion part is inserted into the insertion slot on the other side of the external guide rail, and the housing is locked onto the external guide rail.
[0012] In an alternative embodiment, the housing is further provided with a first stop block located at the bottom of the mounting groove; the lock body is provided with a limit block located on the cavity wall of the mounting cavity, the limit block being disposed opposite to the first stop block, and the first stop block being able to restrict the movement of the limit block in the first direction.
[0013] In one alternative embodiment, the housing includes an upper shell and a lower shell, which are detachably connected. The first heat dissipation groove and the second heat dissipation groove are both located in the lower shell. The upper shell is provided with a plurality of lamp holes communicating with the receiving cavity. The control circuit board is provided with a plurality of indicator lights, which are installed in the lamp holes.
[0014] In one alternative embodiment, the housing is further provided with a slot communicating with the receiving cavity, and the control circuit board is provided with a card slot, which is disposed opposite to the slot. The card slot is for inserting a data card, and the data card can be inserted into the card slot from the slot.
[0015] The beneficial effects of this application embodiment are as follows: Unlike the prior art, this application embodiment includes a housing and a control circuit board. The housing has a receiving cavity and a first heat dissipation groove and a second heat dissipation groove communicating with the receiving cavity. The first and second heat dissipation grooves are arranged opposite each other along a first direction and are connected along the first direction to form a heat dissipation channel. One of the first and second heat dissipation grooves is an air inlet, and the other is an air outlet. The control circuit board is disposed within the receiving cavity and located within the heat dissipation channel. The electronic components on the control circuit board are located within the gas flow path of the heat dissipation channel. The thickness extension direction of the control circuit board is parallel to a second direction, and the second direction is perpendicular to the first direction. With this arrangement, the heat generated by the electronic components on the control circuit board can be dissipated through the gas flow within the heat dissipation channel. The flowing gas exits from the air outlet of one of the first and second heat dissipation grooves, thereby improving the heat dissipation of the electronic components on the control circuit board. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0017] Figure 1 This is a schematic diagram of the overall structure of the IoT controller according to an embodiment of this application from an angle.
[0018] Figure 2 This is an exploded view of the overall structure of the IoT controller according to an embodiment of this application;
[0019] Figure 3 This is another schematic diagram of the overall structure of the IoT controller according to an embodiment of this application;
[0020] Figure 4 yes Figure 3Enlarged schematic diagram of the structure at point A in the middle. Detailed Implementation
[0021] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.
[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0023] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0024] Please see Figure 1 and Figure 2 The IoT controller 1000 includes a housing 10 and a control circuit board 20. The control circuit board 20 is disposed inside the housing 10. The control circuit board 20 inside the IoT controller 1000 is the core component for realizing device intelligence. It not only enables the device to connect to the network, process data and perform complex tasks, but also ensures the safe and reliable operation and remote management of the device.
[0025] The IoT controller 1000 also includes a latch 30 for securing the housing 10 to an external guide rail. The housing 10, control circuit board 20, and latch 30 are described in detail below.
[0026] To better illustrate the structure of the IoT controller 1000, it will be described in conjunction with the first direction X, the second direction Y, and the third direction Z (vertical direction Z), wherein the first direction X is perpendicular to the second direction Y and the third direction Z.
[0027] Regarding the aforementioned housing 10 and control circuit board 20, as Figure 1 and Figure 2As shown, the housing 10 is provided with a receiving cavity 10a and a first heat dissipation groove 10b and a second heat dissipation groove 10c communicating with the receiving cavity 10a. The first heat dissipation groove 10b and the second heat dissipation groove 10c are arranged opposite each other along a first direction X, and the first heat dissipation groove 10b and the second heat dissipation groove 10c are connected along the first direction X to form a heat dissipation channel (not shown in the figure). One of the first heat dissipation groove 10b and the second heat dissipation groove 10c is an air inlet, and the other is an air outlet. The control circuit board 20 is disposed in the receiving cavity 10a, and the control circuit board 20 is located in the heat dissipation channel. The electronic components on the control circuit board 20 are located in the gas flow path of the heat dissipation channel. It can be understood that the first heat dissipation groove 10b can be an air outlet or an air inlet, and the second heat dissipation groove 10c can be an air outlet or an air inlet. This arrangement can promote air flow and increase the heat dissipation efficiency of the control circuit board 20. In this application, no specific limitation is made. This application uses the first heat dissipation groove 10b as an air inlet and the second heat dissipation groove 10c as an air outlet as an example for explanation. External airflow enters the heat dissipation channel from the first heat dissipation slot 10b and flows within the heat dissipation channel. The flowing airflow carries away the heat generated by the control circuit board 20 and flows out from the second heat dissipation slot 10c, thereby achieving heat dissipation for the control circuit board 20.
[0028] In some embodiments, the thickness extension direction of the control circuit board 20 is parallel to the second direction Y. This configuration increases the contact area between the airflow flowing along the first direction X and the control circuit board 20, thereby increasing the heat dissipation rate.
[0029] In some embodiments, there are multiple first heat dissipation slots 10b, which are spaced apart vertically in the Z direction. There are also multiple second heat dissipation slots 10c, which are spaced apart vertically in the Z direction. The number of first heat dissipation slots 10b corresponds to the number of second heat dissipation slots 10c. This arrangement increases the total heat dissipation area, which is beneficial to improving heat dissipation capacity. In addition, it can optimize the airflow path, making it easier for cold air to enter and hot air to exit, thus enhancing the heat dissipation effect of natural convection and forced convection.
[0030] In some embodiments, the housing 10 is made of high-strength, high-temperature resistant, aging resistant engineering plastic material with certain electromagnetic shielding performance. The engineering plastic material contains an appropriate amount of conductive filler, such as carbon fiber and metal powder, to enhance the electromagnetic shielding performance, effectively reduce the impact of external electromagnetic interference on the internal circuit of the IoT controller 1000, and also reduce the interference of electromagnetic radiation generated by the controller itself on surrounding devices.
[0031] In some embodiments, the surface of the housing 10 is specially treated to form a wear-resistant and corrosion-resistant coating to improve the service life and appearance quality of the housing, enabling it to maintain good performance and appearance under different usage scenarios.
[0032] In some embodiments, the surfaces of the first heat sink 10b and the second heat sink 10c are provided with micro-nano structures to enhance their heat dissipation capabilities. The micro-nano structures increase the contact area and heat exchange efficiency between the first heat sink 10b and the second heat sink 10c and the air, thereby further improving the heat dissipation performance of the Internet of Things controller 1000.
[0033] In some embodiments, the housing 10 includes an upper housing 101 and a lower housing 102, which are detachably connected. The first heat dissipation groove 10b and the second heat dissipation groove 10c are both located on the lower housing 102. The detachable connection between the upper housing 101 and the lower housing 102 includes, but is not limited to, screw connection, snap-fit connection, hinge connection, slide rail connection, magnetic connection, etc.
[0034] In some embodiments, the lower shell 102 is provided with two supporting bottoms 1021, which are spaced apart along a first direction X. On the one hand, the two supporting bottoms 1021 can provide support, and on the other hand, the two supporting bottoms 1021 can increase the structural stability of the lower shell 102, making it more robust and durable, and reducing deformation or damage caused by external forces.
[0035] In some embodiments, the upper housing 101 is provided with a plurality of lamp holes 1011 communicating with the receiving cavity 10a, and the control circuit board 20 is provided with a plurality of indicator lights 201, which are installed in the lamp holes 1011. It can be understood that the indicator lights 201 can be used to indicate the working status of the control circuit board 20, such as power status, operating mode, error warning, etc.
[0036] In some embodiments, the housing 10 is further provided with a slot 1012 communicating with the receiving cavity 10a, and the control circuit board 20 is provided with a card slot 202, which is disposed opposite to the slot 1012. The card slot 202 is for inserting a data card, which can be inserted into the card slot 202 from the slot 1012. In some embodiments, the data card is a SIM card, which provides the control circuit board 20 with wireless communication capabilities, enabling it to access a mobile network and realize various functions such as remote communication, data transmission, authentication, and network services.
[0037] In some embodiments, the control circuit board 20 is further provided with a first connection terminal 203 and a second connection terminal 204, the first connection terminal 203 being located on the upper shell 101 and the second connection terminal 204 being located on the lower shell 102. The first connection terminal 203 is a network cable connection terminal, and the second connection terminal 204 is an external wiring terminal.
[0038] In some embodiments, an antenna 205 is also connected to the control circuit board 20, and the antenna 205 is exposed on the outer surface of the upper shell 101.
[0039] In some embodiments, the outer wall of the housing 10 is provided with a mounting groove 102a and a mounting slide 102b communicating with the mounting groove 102a. The mounting groove 102a is used to engage with an external guide rail, thereby enabling the IoT controller 1000 to be connected to the external guide rail. The mounting slide 102b is used for mounting the latch 30. In some embodiments, the mounting groove 102a is located between the two support bottoms 1021.
[0040] For the aforementioned latch 30, such as Figures 1-3 As shown, the latch 30 is disposed within the mounting groove 102b, and the latch 30 can slide along the first direction X within the mounting groove 102b. When the latch 30 slides within the mounting groove 102b to abut against the external guide rail, the housing 10 is locked onto the external guide rail. When the latch 30 slides within the mounting groove 102b to no longer abut against the external guide rail, the housing 10 is no longer locked onto the external guide rail. Specifically, the latch 30 can lock the housing 10 onto the external guide rail. At this time, the IoT controller 1000 is relatively fixed on the external guide rail. When it is necessary to remove the IoT controller 1000 from the external guide rail, simply slide the latch 30 within the mounting groove 102b until it no longer abuts against the external guide rail; at this time, the housing 10 is no longer locked onto the external guide rail.
[0041] In some embodiments, please refer to the following: Figure 4The latch 30 includes a lock body 301 and a latch 302. The lock body 301 has a mounting cavity 301a that communicates with the mounting groove 102b. The latches 302 are located on the two side walls of the mounting cavity 301a along the second direction Y. The two latches 302 are positioned opposite each other and spaced apart along the second direction Y. Along the first direction X, the distance between the two latches 302 gradually decreases. The housing 10 also has a locking block 1021 located at the bottom of the mounting groove 102b. When the lock body 301 moves to a preset position along the first direction X, the two latches 302 engage with the locking block 1021, which is located between the two latches 302. The gradual decrease in the distance between the two latches 302 along the first direction X allows the latch 30 to have a progressive locking action, providing a more stable locking effect, increasing resistance during unlocking, and thus improving security. As the latch 30 moves toward the locking block 1021, the two latches 302 respectively contact the two sides of the locking block 1021 along the second direction Y. Under the abutment of the locking block 1021, the distance between the two latches 302 gradually increases. In some embodiments, the two sides of the locking block 1021 along the second direction Y are symmetrically arranged, and both sides of the locking block 1021 along the second direction Y are provided with a first inclined surface 1021a and a second inclined surface 1021b. The first inclined surface 1021a is inclined upward along the first direction X, and the second inclined surface 1021b is inclined downward along the first direction X.
[0042] In some embodiments, a sliding post 302a is provided at one end of the latch 302 near the locking block 1021. During the movement of the latch 30 towards the locking block 1021, the latch 302 contacts the locking block 1021, and the sliding post 302a on the latch 302 first contacts the first inclined surface 1021a, then gradually slides from the first inclined surface 1021a to the second inclined surface 1021b. This achieves a locking mechanism between the latch 302 and the locking block 1021. The sliding post 302a reduces the contact area between the latch 302 and the locking block 1021, thus reducing wear and tear.
[0043] In some embodiments, the lock body 301 is provided with limiting grooves 3011 on both sides along the second direction Y. The limiting grooves 3011 extend along the first direction X. The mounting groove 102b is provided with a first limiting protrusion 1022 on its side wall along the second direction Y. The first limiting protrusion 1022 is at least partially installed in the limiting groove 3011. The first limiting protrusion 1022 and the limiting groove 3011 cooperate to limit the lock body 301 to slide along the first direction X within the mounting groove 102b.
[0044] In some embodiments, a limiting part 3012 is provided at one end of the lock body 301 away from the mounting groove 102a. When the lock body 301 moves to a preset position along the first direction X, the limiting part 3012 abuts against the first limiting protrusion 1022. The cooperation between the first limiting protrusion 1022 and the limiting part 3012 can limit the displacement distance of the lock body 301 in the direction of the mounting groove 102a.
[0045] In some embodiments, the housing 10 is further provided with a first stop 1023, which is located at the bottom of the mounting groove 102b. The lock body 301 is provided with a limit block 3013, which is located on the cavity wall of the mounting cavity 301a. The limit block 3013 is disposed opposite to the first stop 1023. The first stop 1023 can restrict the movement of the limit block 3013 in the first direction X. The first stop 1023 and the limit block 3013 cooperate to limit the displacement distance of the lock body 301 in the direction away from the mounting groove 102a.
[0046] In some embodiments, the external guide rail is provided with insertion slots on both sides along the first direction X. Along the first direction X, a second limiting protrusion 1024 is provided on the side wall of the mounting groove 102a opposite to the mounting slide groove 102b. The second limiting protrusion 1024 is inserted into the insertion slot on one side of the external guide rail. The lock body 301 is provided with an insertion part 3014 at one end near the mounting groove 102a. When the latch 30 slides in the mounting slide groove 102b to abut against the external guide rail, the insertion part 3014 is inserted into the insertion slot on the other side of the external guide rail, and the housing 10 is locked onto the external guide rail. Specifically, the insertion slot on one side of the external guide rail is inserted by the second limiting protrusion 1024 on the housing 10, and the insertion slot on the other side of the external guide rail is inserted by the insertion part 3014 on the latch 30, thereby locking the IoT controller 1000 onto the external guide rail.
[0047] In this embodiment, a housing 10 and a control circuit board 20 are provided. The housing 10 has a receiving cavity 10a and a first heat dissipation groove 10b and a second heat dissipation groove 10c communicating with the receiving cavity 10a. The first heat dissipation groove 10b and the second heat dissipation groove 10c are arranged opposite each other along a first direction X, and are connected along the first direction X to form a heat dissipation channel. One of the first heat dissipation groove 10b and the second heat dissipation groove 10c is an air inlet, and the other is an air outlet. The control circuit board 20 is disposed within the receiving cavity 10a, located within the heat dissipation channel, and the electronic components on the control circuit board 20 are located within the gas flow path of the heat dissipation channel. The thickness extension direction of the control circuit board 20 is parallel to a second direction Y, which is perpendicular to the first direction X. This arrangement allows the heat generated by the electronic components on the control circuit board 20 to flow through the gas in the heat dissipation channel, with the flowing gas exiting from the air outlet of one of the first heat dissipation grooves 10b and 10c, thereby improving the heat dissipation of the electronic components on the control circuit board 20.
[0048] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. An Internet of Things controller, characterized by, include: The housing is provided with a receiving cavity and a first heat dissipation groove and a second heat dissipation groove communicating with the receiving cavity. The first heat dissipation groove and the second heat dissipation groove are arranged opposite to each other along a first direction. The first heat dissipation groove and the second heat dissipation groove are connected along the first direction to form a heat dissipation channel. One of the first heat dissipation groove and the second heat dissipation groove is an air inlet and the other is an air outlet. A control circuit board is disposed within the receiving cavity. The control circuit board is located within the heat dissipation channel, and the electronic components on the control circuit board are located within the gas flow path of the heat dissipation channel. The thickness extension direction of the control circuit board is parallel to a second direction, and the second direction is perpendicular to the first direction.
2. The IoT controller according to claim 1, characterized in that, The number of first heat dissipation slots is multiple, and the multiple first heat dissipation slots are arranged at intervals in the vertical direction. The number of second heat dissipation slots is also multiple, and the multiple second heat dissipation slots are arranged at intervals in the vertical direction. The number of first heat dissipation slots corresponds to the number of second heat dissipation slots.
3. The IoT controller according to claim 1, characterized in that, The outer wall of the housing is provided with a mounting groove and a mounting slide groove that connects to the mounting groove. The mounting groove is used to engage with an external guide rail. The IoT controller also includes a latch, which is disposed in the mounting groove and can slide in the mounting groove along the first direction. When the latch slides in the mounting groove to abut against the external guide rail, the housing is locked onto the external guide rail. When the latch slides in the mounting groove to no longer abut against the external guide rail, the housing is no longer locked onto the external guide rail.
4. The IoT controller according to claim 3, characterized in that, The latch includes a lock body and a bolt. The lock body is provided with a mounting cavity that communicates with the mounting groove. The bolts are disposed on the two side walls of the mounting cavity along the second direction. The two bolts are arranged opposite to each other and spaced apart along the second direction. Along the first direction, the distance between the two bolts gradually decreases. The housing is also provided with a locking block, which is located at the bottom of the mounting groove. When the lock body moves to the preset position along the first direction, the two locking tongues engage with the locking block, which is located between the two locking tongues.
5. The IoT controller according to claim 4, characterized in that, The lock body is provided with limit grooves on both sides along the second direction, and the limit grooves extend along the first direction; The mounting groove has a first limiting protrusion on its side wall along the second direction, and the first limiting protrusion is at least partially installed in the limiting groove.
6. The IoT controller according to claim 5, characterized in that, The lock body is provided with a limiting part at one end away from the mounting groove. When the lock body moves to a preset position along the first direction, the limiting part abuts against the first limiting protrusion.
7. The IoT controller according to claim 4, characterized in that, The external guide rail is provided with insertion slots on both sides along the first direction. Along the first direction, a second limiting protrusion is provided on the side wall of the mounting groove opposite to the mounting slide groove, and the second limiting protrusion is inserted into the insertion groove on one side of the external guide rail; The lock body has a plug-in part at one end near the mounting groove. When the latch slides in the mounting groove to abut against the external guide rail, the plug-in part is inserted into the plug-in groove on the other side of the external guide rail, and the housing is locked onto the external guide rail.
8. The IoT controller according to claim 4, characterized in that, The housing is also provided with a first stop block, which is located at the bottom of the mounting groove; The lock body is provided with a limiting block, which is located on the cavity wall of the mounting cavity. The limiting block is disposed opposite to the first stop, and the first stop can restrict the movement of the limiting block in the first direction.
9. The IoT controller according to claim 1, characterized in that, The housing includes an upper shell and a lower shell, which are detachably connected. The first heat dissipation groove and the second heat dissipation groove are both located in the lower shell. The upper shell is provided with multiple lamp holes that communicate with the receiving cavity, and the control circuit board is provided with multiple indicator lights, which are installed in the lamp holes.
10. The Internet of Things controller according to claim 1, characterized in that, The housing is also provided with a slot that connects to the receiving cavity, and the control circuit board is provided with a card slot that is opposite to the slot. The card slot is for inserting a data card, and the data card can be inserted into the card slot from the slot.