CN211670866U

CN211670866U - Heat dissipation mechanism, gateway and light gateway

Info

Publication number: CN211670866U
Application number: CN202020381878.5U
Authority: CN
Inventors: 唐志文; 胡新振; 陈可; 彭彬; 孙崑泉
Original assignee: TDK Corp
Current assignee: TDK Corp
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-10-13
Anticipated expiration: 2030-03-24

Abstract

The utility model discloses a heat dissipation mechanism, gateway and light gateway. The heat dissipation mechanism is provided on the housing and includes a heat dissipation portion, and the heat dissipation portion includes: the heat dissipation slit is formed on the side wall of the shell and is communicated with the inner cavity of the shell; and a blocking mechanism formed such that an inner cavity of the housing is blocked from view by the blocking mechanism when viewed through the heat dissipation slit in a direction perpendicular to the side wall. According to the structure, the blocking mechanism can effectively block dust and other impurities from entering the shell, so that the service life of parts accommodated in the inner cavity of the shell and the service life of the power supply are prolonged.

Description

Heat dissipation mechanism, gateway and light gateway

Technical Field

The utility model relates to the field of communication, especially, relate to a heat dissipation mechanism, still relate to the gateway and the light gateway that possess this heat dissipation mechanism.

Background

In the case of using a gateway or a light gateway, it is necessary to transmit electric waves, and heat is generated in the case of transmitting electric waves because of the use of electric power. This heat remains in the housing of the gateway or light gateway causing the temperature within the housing to rise.

In this way, there is a way to exhaust residual heat in the casing by using the exhaust fan, but the use of the exhaust fan increases the power consumption of the product. Further, although there is a method of simply providing mesh-like holes in the side surface of the case to exhaust heat, foreign matter such as dust easily enters the inner cavity of the case through the mesh-like holes, and there is a possibility that the members housed in the inner cavity of the case, the power supply, and the like are adversely affected.

Therefore, a heat dissipation mechanism capable of dissipating heat and preventing dust and other impurities from entering the inner cavity of the housing is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can dispel the heat and can block debris such as dust again and get into heat dissipation mechanism, gateway and light gateway of casing inner chamber.

According to the utility model discloses an aspect provides a heat dissipation mechanism, and it sets up the heat dissipation mechanism on the casing, heat dissipation mechanism possesses the radiating part, the radiating part possesses:

the heat dissipation slit is formed on the side wall of the shell and is communicated with the inner cavity of the shell; and

a blocking mechanism formed such that an inner cavity of the housing is blocked from view by the blocking mechanism when viewed through the heat dissipation slit in a direction perpendicular to the side wall.

According to the structure, the blocking mechanism can effectively block dust and other impurities from entering the shell, so that the service life of parts accommodated in the inner cavity of the shell and the service life of the power supply are prolonged.

Preferably, the blocking mechanism includes:

a connecting portion extending from an inner wall surface of the side wall toward an inner cavity of the housing in a direction perpendicular to the side wall, a side surface of the connecting portion being coplanar with a side surface of the heat dissipation slit; and

a blocking part, one end of which is fixedly connected with the connecting part and the other end extends towards the plane of the other side surface of the heat dissipation slit, the blocking part is provided with a blocking surface which is approximately parallel to the inner wall surface of the side wall,

when the heat dissipation slit is observed in the direction perpendicular to the side wall, the inner cavity of the shell is blocked by the blocking face and cannot be seen.

According to the structure, the blocking mechanism is of an approximately L-shaped structure provided with the connecting part and the blocking part, the blocking part is provided with the blocking surface for blocking impurities such as dust and the like from entering the inner cavity of the shell, the structure is simple, and the manufacturing is facilitated. More preferably, the connecting part and the blocking part are integrally formed, so that the manufacturing process is saved, and the connecting strength of the blocking mechanism is increased.

Preferably, the heat radiating portion further includes:

a first partition extending from an outer wall surface of the side wall toward an outside of the case in a direction perpendicular to the side wall, a side surface of the first partition being coplanar with a side surface of the heat dissipation slit; and

and a second partition extending from an outer wall surface of the side wall toward an outside of the case in a direction perpendicular to the side wall, a side surface of the second partition being coplanar with the other side surface of the heat dissipation slit.

According to the structure, the first separating part and the second separating part which are respectively arranged at the two sides of the heat dissipation slit can effectively prevent impurities such as dust and the like from entering the inner cavity of the shell from the direction which is not perpendicular to the heat dissipation slit, and further play a role in preventing impurities such as dust and the like, so that the service lives of components contained in the inner cavity of the shell and the service life of a power supply are effectively guaranteed.

Preferably, the blocking means comprise a first blocking means and/or a second blocking means,

the first blocking mechanism includes:

a first connection portion extending from an inner wall surface of the side wall toward an inner cavity of the case in a direction perpendicular to the side wall, a side surface of the first connection portion being coplanar with a first side surface of the heat dissipation slit; and

a first blocking part, one end of which is fixedly connected with the first connecting part and the other end extends towards the plane of the second side surface of the heat dissipation slit, the first blocking part is provided with a first blocking surface which is approximately parallel to the inner wall surface of the side wall, when the observation is carried out through the heat dissipation slit in the direction vertical to the side wall, the inner cavity of the shell is blocked by the first blocking surface and is invisible,

the second stopper mechanism includes:

a second connection portion extending from an inner wall surface of the side wall toward an inner cavity of the case in a direction perpendicular to the side wall, a side surface of the second connection portion being coplanar with a second side surface of the heat dissipation slit; and

and one end of the second blocking part is fixedly connected with the second connecting part, the other end of the second blocking part extends towards the plane where the first side face of the heat dissipation slit is located, the second blocking part is provided with a second blocking face approximately parallel to the inner wall face of the side wall, and when the second blocking part is observed through the heat dissipation slit in the direction perpendicular to the side wall, the inner cavity of the shell is blocked by the second blocking face and cannot be seen.

According to the structure, in the two blocking mechanisms, the extending directions of the blocking parts relative to the connecting parts are different, so that the blocking parts can receive heat flowing clockwise and heat flowing anticlockwise, and flexible arrangement is facilitated according to the flowing direction of actual heat.

Preferably, the heat dissipation mechanism includes a plurality of heat dissipation portions provided on the same side wall of the housing.

With this configuration, the plurality of heat radiating portions are provided on the same side wall of the housing, which is advantageous for rapid heat radiation.

Preferably, the plurality of heat dissipation portions having the first barrier portion are arranged side by side in one region of the side wall, and the plurality of heat dissipation portions having the second barrier portion are arranged side by side in another region of the side wall.

Preferably, the plurality of heat dissipation parts having the first barrier and the plurality of heat dissipation parts having the second barrier are alternately disposed on the sidewall.

According to the structure, the heat dissipation parts arranged on the same side wall can be intensively arranged according to types or alternatively arranged, and the arrangement mode is flexible and variable.

Preferably, the heat dissipation mechanism further includes a heat dissipation hole formed in a bottom wall of the housing, and the heat dissipation hole communicates with an inner cavity of the housing.

According to such structure, the radiating holes formed in the bottom wall of the shell can increase the radiating effect and is beneficial to quick heat radiation.

According to the utility model discloses a another aspect provides a gateway, be provided with any one of the aforesaid on the casing of gateway heat dissipation mechanism.

According to the structure, the heat dissipation mechanism is arranged on the shell of the gateway, and the blocking mechanism of the heat dissipation mechanism can effectively block impurities such as dust from entering the shell of the gateway, so that the service life of components and a power supply accommodated in an inner cavity of the gateway can be prolonged.

According to the utility model discloses a light gateway is provided in another aspect, be provided with above-mentioned arbitrary heat dissipation mechanism on the casing of light gateway, light gateway only has the partial function of gateway.

According to the structure, the heat dissipation mechanism is arranged on the shell of the light gateway only having partial functions of the gateway, and the blocking mechanism of the heat dissipation mechanism can effectively block impurities such as dust from entering the shell of the light gateway, so that the service life of components and a power supply accommodated in the inner cavity of the light gateway can be prolonged.

Drawings

The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. Wherein the included drawings are:

fig. 1 shows a schematic structural diagram of a housing of an electronic product having a heat dissipation mechanism according to a first embodiment of the present invention.

Fig. 2 shows a schematic diagram of the inner cavity structure of the housing in fig. 1.

Fig. 3 is a schematic view showing a structure in which the heat dissipation part shown in fig. 2 is cut off by a plane parallel to the bottom surface of the case.

Fig. 4 shows a schematic configuration diagram of the heat dissipation portion as viewed from the outside of the housing.

Fig. 5 shows a top view of the interior cavity of the housing shown in fig. 2.

Fig. 6 shows a schematic distribution of the heat sink member having the first barrier and the heat sink member having the second barrier on the same sidewall.

Fig. 7 is a schematic view showing a heat dissipation portion corresponding to a case where heat in the case flows in a counterclockwise direction.

Fig. 8 is a schematic view showing a heat dissipation portion corresponding to the case where heat in the case flows in a clockwise direction.

Fig. 9 illustrates a bottom view of the housing shown in fig. 2.

Figure 10 shows a topology diagram of a prior art bluetooth low energy mesh network.

Fig. 11 shows a topology diagram of a bluetooth low energy mesh network according to the second embodiment of the present invention.

Fig. 12 shows a scanning strategy diagram of a gateway in the prior art.

Fig. 13 shows a schematic structural diagram of a gateway in the second embodiment of the present invention.

Fig. 14 shows a scanning strategy diagram of a gateway in the second embodiment of the present invention.

Fig. 15 shows a flow diagram of a subnet configuration method of a bluetooth low energy mesh network.

Fig. 16 is a flowchart illustrating a method for determining a target subnet according to subnet information by a light gateway.

Fig. 17 is a diagram showing an example of a subnet configuration method of a bluetooth low energy mesh network.

Fig. 18 shows a flow diagram of a message upload method based on a bluetooth low energy mesh network.

Fig. 19 is a diagram illustrating an example of a message upload method based on a bluetooth low energy mesh network.

Fig. 20 shows a flow diagram of a bluetooth tag location determination method based on a bluetooth low energy mesh network.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings and embodiments, thereby to how to apply the technical means to solve the technical problem, and to achieve the technical effect of the realization process can be fully understood and implemented.

In the related art, there is a method of simply providing mesh-like holes in the side surface of the case to exhaust heat, but foreign matter such as dust easily enters the inner cavity of the case through the mesh-like holes, and there is a possibility that the member accommodated in the inner cavity of the case, the power supply, and the like are adversely affected. In order to solve the problem, an embodiment of the present invention provides a heat dissipation mechanism capable of dissipating heat and blocking impurities such as dust from entering an inner cavity of a housing.

Example one

Fig. 1 shows a schematic structural diagram of a housing of an electronic product having a heat dissipation mechanism 21 according to a first embodiment of the present invention. Fig. 2 shows a schematic diagram of the inner cavity structure of the housing 2 in fig. 1. As shown in fig. 1, a housing of an electronic product includes a case 2 and a lid 1 that is engaged with the case 2. Referring to fig. 2 and 5, the heat dissipation mechanism 21 according to the embodiment of the present invention is disposed on three side walls of the housing 2, and the heat dissipation mechanism 21 includes one or more heat dissipation portions. Of course, the heat dissipation mechanism 21 may be disposed on only one or two side walls of the housing 2, and the number of the heat dissipation portions included in the heat dissipation mechanism 21 may also be flexibly set according to actual requirements, which is not limited by the present invention.

The structure of the heat radiating portion of the heat radiating mechanism 21 will be described in detail below with reference to fig. 3 and 4.

Fig. 3 shows a schematic structural view of the heat dissipation part shown in fig. 2 after being cut by a plane parallel to the bottom surface of the case 2. As shown in fig. 3, the heat radiating portion includes a heat radiating slit 213 and a stopper mechanism. The heat dissipation slit 213 is opened in the side wall of the housing 2 and communicates with the inner cavity of the housing 2. The sectional shape of the heat dissipation slit 213 may be a rectangle, or a rectangle at the middle and a semicircle at both ends. Two sides opposite to each other in the middle of the heat radiating slit 213 are a first side 2131 and a second side 2132, respectively. The blocking mechanism is formed such that the inner cavity of the housing 2 is blocked from view by the blocking mechanism when viewed through the heat dissipation slit 213 in a direction perpendicular to the side wall.

Here, in order to effectively radiate heat flowing in different directions (clockwise and counterclockwise directions) to the outside of the housing 2, the blocking mechanism may include a first blocking mechanism and a second blocking mechanism.

The first stopper mechanism includes a first connecting portion 214 and a first stopper portion 215. The first connection portion 214 extends from the inner wall surface 211 of the side wall toward the inner cavity of the housing 2 in a direction perpendicular to the side wall, and a side surface of the first connection portion 214 is coplanar with the first side surface 2131 of the heat dissipation slit 213. One end of the first blocking portion 215 is fixedly connected to the first connecting portion 214, and the other end extends toward a plane where the second side surface 2132 of the heat dissipation slit 213 is located, and the first blocking portion 215 has a first blocking surface substantially parallel to the inner wall surface 211 of the sidewall. The first connection portion 214 and the first stopper portion 215 are formed in a substantially L-shape. The inner cavity of the housing 2 is blocked from view by the first blocking surface when viewed through the heat dissipation slit 213 in a direction perpendicular to the side wall.

Therefore, when impurities such as dust enter the heat dissipation slit 213, the first blocking surface of the first blocking mechanism can effectively block the impurities such as dust from entering the inside of the housing 2, thereby being beneficial to prolonging the service life of the components and the power supply accommodated in the inner cavity of the housing 2.

In addition, the first blocking mechanism is a substantially L-shaped structure having the first connecting portion 214 and the first blocking portion 215, and the first blocking portion 215 has a first blocking surface for blocking foreign matters such as dust from entering the inner cavity of the housing 2, which is simple in structure and advantageous for manufacturing. The first connecting portion 214 and the first blocking portion 215 are preferably integrally formed, which can save the manufacturing process and increase the connecting strength of the first blocking mechanism.

On the other hand, the space surrounded by the first connecting portion 214 and the first blocking portion 215 of the first blocking mechanism and the heat dissipation slit 213 together constitute a heat dissipation channel through which the heat inside the housing 2 can be dissipated to the outside of the housing 2.

The second blocking mechanism is similar to the first blocking mechanism in structure, and the second blocking mechanism and the first blocking mechanism are mirror symmetry. Specifically, the second stopper mechanism includes a second connecting portion and a second stopper portion. The second connecting portion extends from the inner wall surface of the side wall toward the inner cavity of the housing in a direction perpendicular to the side wall, and the side surface of the second connecting portion is coplanar with the second side surface of the heat dissipation slit. One end of the second blocking part is fixedly connected with the second connecting part, the other end of the second blocking part extends towards the plane where the first side face of the heat dissipation slit is located, and the second blocking part is provided with a second blocking face which is approximately parallel to the inner wall face of the side wall. The second connecting part and the second blocking part are formed into a roughly L shape. When the heat dissipation slit is observed in the direction perpendicular to the side wall, the inner cavity of the shell is blocked by the second blocking surface and is invisible.

Therefore, when impurities such as dust enter the heat dissipation slit, the second blocking surface of the second blocking mechanism can effectively block the impurities such as the dust from entering the shell, and therefore the service life of components contained in the inner cavity of the shell and the service life of the power supply are prolonged. In addition, the second blocking mechanism is of an approximately L-shaped structure provided with a second connecting part and a second blocking part, the second blocking part is provided with a second blocking surface for blocking impurities such as dust and the like from entering the inner cavity of the shell, and the structure is simple and is beneficial to manufacturing. The second connecting part and the second blocking part are preferably integrally formed, so that the manufacturing process is saved, and the connecting strength of the second blocking mechanism is increased. On the other hand, the space enclosed by the second connecting part and the second blocking part of the second blocking mechanism and the heat dissipation slit together form a heat dissipation channel, and heat in the shell can be dissipated to the outside of the shell through the heat dissipation channel.

In a preferred embodiment of the present invention, referring to fig. 4, in order to further reduce the possibility of impurities such as dust entering the housing 2, the heat dissipation portion further includes a first partition 216 and a second partition 217 both disposed on the outer side wall of the housing 2. The first partition 216 extends from the outer wall surface 212 of the side wall toward the outside of the case 2 in a direction perpendicular to the side wall, and the side surface of the first partition 216 is coplanar with the first side surface 2131 of the heat dissipation slit 213. The second partition 217 extends from the outer wall surface 212 of the sidewall toward the outside of the case 2 in a direction perpendicular to the sidewall, and the side surface of the second partition 217 is coplanar with the second side surface 2132 of the heat dissipation slit 213. Therefore, the first partition part 216 and the second partition part 217 respectively arranged at two sides of the heat dissipation slit 213 can effectively prevent impurities such as dust from entering the inner cavity of the housing 2 from the direction which is not perpendicular to the heat dissipation slit 213, and further play a role of preventing impurities such as dust, thereby more effectively ensuring the service life of the components and the power supply accommodated in the inner cavity of the housing 2.

In a preferred embodiment of the present invention, when the heat dissipation mechanism 21 includes a plurality of heat dissipation portions provided on the same side wall of the housing 2, referring to fig. 6, the plurality of heat dissipation portions (heat dissipation portion B group) having the first blocking portion 215 are provided side by side in one region of the side wall, and the plurality of heat dissipation portions (heat dissipation portion a group) having the second blocking portion are provided side by side in another region of the side wall. Alternatively, a plurality of heat dissipation parts having the first barrier 215 and a plurality of heat dissipation parts having the second barrier are alternately disposed on the sidewalls (not shown), in which case two kinds of heat dissipation parts are alternately arranged with each other and the heat dissipation parts of the same kind are not adjacent to each other.

Here, the heat radiating part having the first barrier 215 is adapted to radiate heat flowing clockwise in the case 2, and the heat radiating part having the second barrier is adapted to radiate heat flowing counterclockwise in the case 2. As shown in fig. 7, heat flowing counterclockwise (arrow P) is radiated from the heat radiating portions having the second barrier portions provided on the respective sidewalls of the case 2, and such heat can also be radiated a small amount from the heat radiating portions having the first barrier portions 215. Similarly, as shown in fig. 8, heat flowing clockwise (arrow Q) is radiated from the heat radiating portions having the first barrier portions 215 provided on the respective side walls of the housing 2, and such heat can also be radiated from the heat radiating portions having the second barrier portions in a small amount.

In a preferred embodiment of the present invention, as shown in fig. 9, the heat dissipation mechanism 21 further includes heat dissipation holes 22 formed in the bottom wall of the housing 2, and the heat dissipation holes 22 communicate with the inner cavity of the housing 2. The heat dissipation holes 22 formed in the bottom wall of the housing 2 can increase the heat dissipation effect, and facilitate rapid heat dissipation.

The heat dissipation mechanism can be arranged on the shell of the gateway or the light gateway. Therefore, the blocking mechanism can effectively block dust and other impurities from entering the interior of the shell of the gateway or the light gateway, and is beneficial to prolonging the service life of components and power supplies accommodated in the inner cavity of the shell of the gateway or the light gateway.

The gateways and the light gateways may form a bluetooth mesh network. The bluetooth mesh network, a subnet configuration method based on the bluetooth mesh network, a message uploading method, and a bluetooth tag position determining method will be described in detail below.

It should be noted that BLE (Bluetooth Low Energy) mesh network is taken as an example to describe the following embodiments in detail.

Example two

In conventional designs, BLE communications are peer-to-peer. The BLE tag or sensor node communicates directly with the gateway. As shown in fig. 10, the tags are respectively connected with the cloud server through two gateways. With this communication approach, due to the hardware limitations of BLE technology, messages cannot be transmitted over long distances, so the gateway must be deployed very close to the BLE tag to receive BLE messages sent by the BLE tag. In addition, the cost of the air gates is high, and the deployment density of the gateways is high, so that the deployment cost of the whole network is high.

In order to solve the above technical problem that exists among the prior art, the embodiment of the utility model provides a can long distance transmission message and dispose bluetooth low-power consumption mesh network with low costs.

The bluetooth low energy mesh network of the present embodiment is provided with a plurality of subnets. Each subnet is provided with one gateway and at least one light gateway. Here, the gateway acts as an access device and the light gateway acts as a relay device. The light gateway has only partial functions of the gateway, and thus the deployment cost of the light gateway is lower than that of the gateway. The gateway is in communication connection with the cloud server. Each light gateway may be in communication with the gateway directly or via other light gateways. The messages output by the Bluetooth tag are relayed to the gateway through one or more light gateways, then the received messages are processed by the gateway and uploaded to the cloud server, and the uploaded messages are stored and analyzed by the cloud server.

Fig. 11 shows a topology diagram of a bluetooth low energy mesh network according to the second embodiment of the present invention. Referring to fig. 11, the bluetooth low energy mesh network 200 is provided with a subnet 201, a subnet 202, and a subnet 203. The structure of the subnet is described below by taking the subnet 201 as an example. The subnet 201 comprises one gateway GW1 and two light gateways LGW1, LGW 2. The TAG1 is communicatively connected to the gateway GW1 via a light gateway LGW 1. The TAG2 is communicatively connected to the gateway GW1 via a light gateway LGW 2. Gateway GW1 is communicatively coupled to cloud server 100. The light gateways belonging to the same subnet may not be communicatively connected to each other (e.g., the light gateway in subnet 201) or may be communicatively connected to each other (e.g., the light gateways in subnet 202 and subnet 203), which is not limited by the embodiment of the present invention.

In this embodiment, the light gateway only has partial functions of the gateway, such as a message receiving function, a message sending function, and a message filtering function. The function of the light gateway is not limited to this, and the light gateway may further include an assisted positioning function of the gateway, which is to perform assisted positioning based on a Received Signal strength indication value (RSSI).

By applying the bluetooth low energy mesh network of the embodiment, the light gateway for relaying the message is added between the bluetooth tag and the gateway, and the message can be transmitted to the gateway deployed outside the long distance after being relayed by the light gateway, so that the long distance transmission of the message can be realized. In addition, the light gateway only has partial functions of the gateway, so that the deployment cost of the light gateway is lower than that of the gateway, and the deployment cost of the Bluetooth low-power mesh network can be effectively reduced.

The embodiment of the utility model provides a mainly used establishes simple, reliable, low-cost wireless transmission network to solve the limited problem of bluetooth low-power consumption mesh network transmission distance, and can the assistance-localization real estate position. The Bluetooth low energy mesh network of the embodiments of the present invention can realize many-to-many (M: M) device communication for creating a large-scale device network. The embodiment of the utility model provides a be suitable for and be applied to in building automation, asset management system, sensor network and other thing networking solutions, can realize tens, hundreds and even thousands between the equipment extensive, long distance, reliable and safe communication.

Fig. 12 shows a scanning strategy diagram of a gateway in the prior art. As shown in figure 12, the gateway uses a single BLE chip to poll for three scanning channels. The BLE chip first performs a message scan on a first scan channel (scan channel 37, whose center frequency is 2402MHz), then performs a message scan on a second scan channel (scan channel 38, whose center frequency is 2426MHz), and then performs a message scan on a third scan channel (scan channel 39, whose center frequency is 2480 MHz). Next, the BLE chip repeatedly performs the above scanning process. When scanning the messages on the scanning channels, the time period of each scanning is determined by the scanning interval and the scanning window parameter.

However, when the gateway further includes the 2.4G WIFI module (the gateway of this embodiment includes the 2.4G WIFI module and the 5 gwifii module), the wireless scanning of the 2.4G WIFI module may interfere with one or two of three scanning channels of the BLE chip, so as to reduce the reliability of data transmission.

In order to solve the above problem, an embodiment of the present invention improves the internal components of the gateway and the light gateway. Fig. 13 shows a schematic structural diagram of a gateway according to an embodiment of the present invention, and fig. 14 shows a schematic scanning strategy diagram of a gateway according to an embodiment of the present invention. In a preferred embodiment of the present invention, referring to fig. 13 and 14, the gateway has a first bluetooth low energy chip, a second bluetooth low energy chip, a third bluetooth low energy chip and a processor. The first bluetooth low energy chip performs a message scan on a first scan channel (scan channel 37, whose center frequency is 2402 MHz). The second bluetooth low energy chip performs a message scan on a second scan channel (scan channel 38, centered at 2426 MHz). The third bluetooth low energy chip performs a message scan on a third scan channel (scan channel 39, whose center frequency is 2480 MHz). The processor is in communication connection with the first Bluetooth low-power chip, the second Bluetooth low-power chip and the third Bluetooth low-power chip respectively. The scanning of the first Bluetooth low energy chip on the first scanning channel, the scanning of the second Bluetooth low energy chip on the second scanning channel and the scanning of the third Bluetooth low energy chip on the third scanning channel are carried out simultaneously. And the messages scanned by each Bluetooth low-power chip are transmitted to the processor through the UART interface, and the messages are filtered and processed by the processor. The processor may be a processor such as a CPU. In particular, the first bluetooth low energy chip, the second bluetooth low energy chip, the third bluetooth low energy chip and the processor are integrated on the same printed circuit board.

In this embodiment, since the gateway employs three bluetooth low energy chips, and each bluetooth low energy chip individually scans one scanning channel, compared with the prior art in which a single bluetooth low energy chip is used to poll three scanning channels, the scanning efficiency of this embodiment is increased by several times. In addition, because three scanning channels are scanned simultaneously, the possibility of receiving messages is increased, and the reliability of the whole Bluetooth low-power mesh network is ensured.

In addition, under the condition that the gateway is integrated with a 2.4G WIFI module besides a processor and three Bluetooth low-power chips, the gateway of the embodiment can solve the problem that the 2.4G WIFI module interferes with scanning channels of the Bluetooth low-power chips. Specifically, the channels used by the bluetooth low energy chip scan are typically scan channels 37, 38 and 39. The relevant WIFI interference channels are 1, 3, 4, 5, 13 and 14, so the best solution is to use WIFI channels 2, 6, 7, 8, 9, 10, 11 and 12. 2.4G WIFI will only interfere with 1 to 2 of the first, second and third scan channels. Therefore, under the condition that 3 bluetooth low energy chips work simultaneously, the scanning of at least one bluetooth low energy chip will not receive the influence of WIFI, and this has improved data transmission's reliability. That is, when the 2.4G WIFI module is operating on a certain channel, it only affects a portion of the scan channels of the bluetooth low energy chip. For example, the WIFI channel 2412MHz only affects the first scanning channel 37 (center frequency is 2402MHz) and the second scanning channel 38 (center frequency is 2426MHz), but the WIFI channel 2412MHz does not affect the third scanning channel 39 (center frequency is 2480 MHz). The three Bluetooth low-power chips are used for scanning 3 scanning channels simultaneously, so that the anti-interference capability can be improved, and the network is more reliable.

In a preferred embodiment of the present invention, the configuration structure of the light gateway is similar to the gateway, and also has three bluetooth low energy chips (a fourth bluetooth low energy chip, a fifth bluetooth low energy chip, and a sixth bluetooth low energy chip). However, the light gateway does not have a processor and a WIFI module. And the fourth Bluetooth low-power chip scans the message on the first scanning channel. And the fifth Bluetooth low-power chip performs message scanning on the second scanning channel. And the sixth Bluetooth low-power chip performs message scanning on the third scanning channel. And the fourth Bluetooth low-power chip, the fifth Bluetooth low-power chip and the sixth Bluetooth low-power chip simultaneously scan messages on respective scanning channels. And the fourth Bluetooth low-power chip, the fifth Bluetooth low-power chip and the sixth Bluetooth low-power chip are integrated on the same printed circuit board.

The configuration principle of the light gateway is the same as that of the gateway, and repeated contents are not described herein again. The configuration of the light gateway in this embodiment can also increase the scanning efficiency by times, thereby improving the possibility of receiving messages, and on the other hand, the light gateway can also improve the anti-interference capability, so that the network is more reliable.

A subnet configuration method of the bluetooth low energy mesh network of the second embodiment is described below. Fig. 15 shows a flowchart of a subnet configuration method of the bluetooth low energy mesh network of fig. 11. As shown in fig. 15, the subnet configuration method mainly includes steps S101 to S104.

In step S101, each gateway in the bluetooth low energy mesh network is divided into different subnets.

Specifically, one gateway uniquely corresponds to one subnet. Different gateways are divided into different subnets. Referring to the example in fig. 17, the mesh network includes two gateways GW1 and GW 2. In this case, gateway GW1 is divided into subnet 201 and gateway GW2 is divided into subnet 202.

In step S102, each gateway in the bluetooth low energy mesh network forwards subnet information of a subnet to which the gateway belongs within the mesh network. Here, the subnet information includes a subnet identification code and an information lifetime, and the information lifetime in the subnet information is reduced by 1 each time the subnet information is forwarded.

Specifically, each gateway in the bluetooth low energy mesh network periodically forwards subnet information of the subnet to which the gateway belongs within the mesh network range. The gateway may forward the subnet information in such a way that the subnet information is flooded throughout the mesh network. In order to prevent the information from being forwarded endlessly, the information lifetime in the subnet information is limited.

The detailed description is made with reference to the example in fig. 17. The gateway GW1 outputs subnet information associated with the subnet to which the gateway GW1 belongs. The subnet information includes a subnet identification code and an information lifetime (hereinafter referred to as TTL value). The subnet identification code is uniquely corresponding to the subnet and is the identity of the subnet. The time to live of information in the subnet information output by gateway GW1 is a default value. In the example shown in fig. 17, the default value of TTL value is 3. The TTL value of the subnet information output from gateway GW1 is 3. The lifetime of the information in the subnet information is reduced by 1 every time the subnet information is forwarded. And after receiving the subnet information with the TTL value of 3, the light gateway subtracts 1 from the TTL value of the subnet information and continuously forwards the subnet information to a subsequent light gateway in communication connection with the light gateway. And when the subnet information is forwarded by the subsequent light gateway once, the TTL of the subnet information is also reduced by 1 by itself until a certain light gateway receives the subnet information with the TTL value of 0. When receiving the subnet information with TTL value of 0, a certain light gateway directly discards the subnet information with TTL value of 0 without forwarding outwards.

In step S103, the light gateway receives subnet information of each subnet, and determines a target subnet according to the subnet information.

Specifically, a method for the light gateway to determine the target subnet according to the subnet information is shown in fig. 16. The method mainly includes steps S1031 to S1034.

In step S1031, the light gateway compares the information lifetime in all the received subnet information.

In step S1032, the light gateway determines whether only one subnet information having the largest information lifetime exists among all the received subnet information.

In step S1033, when it is determined that only one subnet information having the largest information lifetime exists in all the received subnet information, the subnet corresponding to the subnet information having the largest information lifetime is determined as the target subnet.

In this step, the subnet corresponding to only one subnet information having the largest information lifetime is determined as the target subnet.

In step S1034, when it is determined that there is not only one subnet information having the largest information lifetime (i.e., there are a plurality of subnet information having the largest information lifetime), among all the received subnet information, the subnet corresponding to the subnet information having the largest received signal strength indication value among the subnet information having the largest information lifetime is determined as the target subnet.

In this step, when a plurality of information survival times are aligned to be the maximum, the target subnet is determined based on the received signal strength indication value. That is, the received signal strength indication values of the plurality of pieces of subnet information having the largest information lifetime in parallel are compared, and the subnet corresponding to the subnet information having the largest received signal strength indication value among the plurality of pieces of subnet information is determined as the target subnet.

In step S104, the light gateway joins the determined target subnet.

Specifically, after the target subnet is determined in the above manner, the light gateway is added to the target subnet so as to be subordinate to the target subnet.

The method of steps S101 to S104 above is applied to each individual light gateway (i.e. light gateway not belonging to a certain subnet yet) to configure these individual light gateways into the subnet, thereby completing the subnet configuration of the entire bluetooth low energy mesh network. For a light gateway that cannot join a certain subnet using the above steps, it is set that the light gateway belongs to each subnet.

The process of joining a subnet by a light gateway LGW3 is explained with reference to fig. 17. The gateway GW1 transmits subnet information with TTL as default value 3 to the light gateway LGW 3. The gateway GW2 transmits the subnet information with TTL of 1 to the light gateway LGW3 through the two light gateways (the TTL value of the subnet information transmitted by the gateway GW2 is reduced by 1 for every light gateway, and after relaying through the two light gateways, the TTL value is changed from the default value of 3 to 1). Next, the light gateway LGW3 compares TTL values of the subnet information from the gateways GW1 and GW2, and takes the gateway GW1 corresponding to the subnet information whose TTL value (i.e., 3) is large as a target gateway. The light gateway LGW3 then joins the target subnet 201 to which the target gateway GW1 belongs.

The process of joining a subnet by a light gateway LGW4 is explained with reference to fig. 17. The gateway GW1 transmits the subnet information with TTL of 2 to the light gateway LGW4 through one light gateway. The gateway GW2 transmits the subnet information with TTL of 2 to the light gateway LGW4 through a light gateway (the TTL value of the subnet information transmitted by the gateway GW2 is reduced by 1 for every light gateway, and after relaying through a light gateway, the TTL value is changed from the default value of 3 to 2). Next, the light gateway LGW3 compares TTL values of the subnet information from the gateways GW1 and GW2, and when the TTL values of the two subnet information are compared to be the same (both are 2), the gateway GW1 corresponding to the subnet information having a large received signal strength indication value is set as the target gateway. The light gateway LGW4 then joins the target subnet 201 to which the target gateway GW1 belongs.

According to the method, the light gateway can select and join the subnet closest to the light gateway by using the received subnet information of each subnet. The setting of the information survival time can limit the forwarding times of the subnet information of each subnet in the mesh network, and can reduce the network flow.

In addition, in order to solve the problems that in the prior art, when an edge node communicates with a gateway, a message sent in a plain text format can be easily detected by a third party, so that the risk of information leakage is high, and the whole network is easily attacked by a hacker, preferably, subnet information transmitted in a subnet configuration process is encrypted, then the encrypted subnet information is forwarded within the range of a mesh network, and after receiving the encrypted subnet information, the light gateway decrypts the received encrypted subnet information and determines a target subnet according to the decrypted subnet information. Specifically, the subnet information is encrypted using the AES128 algorithm.

The subnet configuration method can improve the security of subnet information transmission in the mesh network, thereby reducing the leakage risk of subnet information and the possibility of hacking of the whole network.

A message uploading method of the bluetooth low energy mesh network according to the second embodiment is described below. Fig. 18 shows a flowchart of a message upload method based on the bluetooth low energy mesh network of fig. 11. As shown in fig. 18, the message uploading method mainly includes steps S201 to S203.

In step S201, the bluetooth tag broadcasts a message, which includes a message body, a message lifetime, and a message sequence number.

In step S202, the light gateway receives the message broadcasted by the bluetooth tag, and performs flooding transmission on the message in the subnet to which the light gateway belongs, so as to forward the message to the gateway in the subnet.

In step S203, the gateway processes the received message and uploads the processed message to the cloud server.

The method for performing flooding transmission on a message in the subnet to which the light gateway belongs in step S202 is described in detail below with reference to fig. 19.

The message broadcast by bluetooth includes a message body, a message lifetime, and a message sequence number. The message text is specific data to be uploaded to the cloud server. The message lifetime is similar to the information lifetime involved in the subnet configuration method, and is used for limiting the transmission times of the message so as to prevent the endless forwarding of the message. The message sequence number is an identification of the message, and each message has a message sequence number uniquely corresponding to it. Here, the earlier the time of the message output by the bluetooth tag is, the smaller the message sequence number of the message is, and the earlier the message output is an old message compared to the message output subsequently.

Referring to fig. 19, the message broadcasted by the bluetooth TAG3 is first received directly by the gateway GW 1. In subnet 201, there are three communication paths associated with bluetooth TAG 4: route one, TAG3- > LGW5- > LGW6- > LGW 7; route two, TAG3- > LGW5- > LGW8- > GW 1; route three, TAG3- > LGW5- > LGW6- > LGW8- > GW 1.

There are two processes involved by the light gateway for relaying messages during message transmission. Firstly, the light gateway executes an updating operation of subtracting 1 from the message lifetime in the received message, and judges whether the message lifetime in the message after the updating operation is 0 or not, if the message lifetime in the message after the updating operation is judged to be 0, the message after the updating operation is discarded, and if the message lifetime in the message after the updating operation is judged to be more than 0, whether the message sequence number with the value more than the message sequence number in the message after the updating operation is stored locally or not is further judged. And under the condition that the message sequence number of the value in the message after the updating operation is judged not to be stored locally, the message sequence number in the message after the updating operation is stored locally and the message after the updating operation is forwarded to a light gateway or a gateway which is in communication connection with the light gateway.

The forwarding process of the message is explained by taking the light gateway LGW6 as an example. After receiving the message with the TTL value of 2 forwarded by the light gateway LGW5, the light gateway LGW6 first determines that the TTL value (2) in the received message is greater than 0, and then the light gateway LGW6 subtracts 1 from the TTL value of the message, and the updated TTL value is 1. Next, the light gateway LGW6 determines whether a message sequence number whose value is greater than or equal to the message sequence number in the message is stored locally, that is, the light gateway LGW6 determines whether a message which is a duplicate message or an old message with respect to the message is stored locally, and the light gateway LGW6 stores the message sequence number in the message locally and forwards the updated message (TTL value is 1) to the light gateway LGW7 and the light gateway LGW8 when determining that the message sequence number whose value is greater than or equal to the message sequence number in the message is not stored locally. Subsequently, the light gateway LGW7 and the light gateway LGW8 also forward the message with the same flow.

According to the above method, in one aspect, a bluetooth low energy mesh network utilizes a flooding method (i.e., a flooding mechanism) in which message transmission is managed (i.e., message lifetime is utilized to limit the number of times a message is forwarded in a subnet) for message propagation in a subnet. Messages can only be forwarded within the subnet range, thus reducing network traffic. It can be seen that the above method is a simple and reliable form of message relaying suitable for low power wireless mesh networks, particularly those handling large amounts of multicast traffic. This makes the above approach ideal for applications in the business and industrial markets with stringent reliability, scalability and performance requirements. On the other hand, the method can inhibit the situation that the message is repeatedly forwarded by the same light gateway and the situation that the light gateway forwards the old message after forwarding the new message through the message sequence number, so that the repeated message and the old message can be filtered, thereby reducing the repeated service in the network and preventing malicious attack.

In addition, in order to solve the problems that in the prior art, when an edge node communicates with a gateway, a message sent in a plain text format can be easily detected by a third party, so that the risk of information leakage is high, and the whole network is easily attacked by a hacker, preferably, the message transmitted in the message uploading process is encrypted, then the encrypted message is subjected to flooding transmission in the subnet range, and after the light gateway receives the encrypted message transmitted by the Bluetooth tag or other light gateways, decrypting the received encrypted message, judging that the message survival time in the message after the updating operation is more than 0, and in case that the message sequence number whose value is above the message sequence number in the message after the update operation is not locally stored, and encrypting the message after the updating operation, and forwarding the encrypted message to a light gateway or a gateway which is in communication connection with the light gateway. In particular, the AES128 algorithm is used to encrypt the message.

The method can improve the safety of the transmission of the message output by the Bluetooth tag in the subnet, thereby reducing the leakage risk of the message and the possibility that the whole network is attacked by hackers.

A bluetooth tag location determination method based on the bluetooth low energy mesh network of the second embodiment is described below. Fig. 20 shows a flow diagram of a bluetooth tag location determination method based on a bluetooth low energy mesh network. As shown in fig. 20, the bluetooth tag position determination method mainly includes step S301 and step S302.

In step S301, the cloud server obtains received signal strength indication values of messages broadcasted by the at least three devices for receiving the bluetooth tag. Here, at least three devices are affiliated with the bluetooth mesh network.

Specifically, after the bluetooth tag broadcasts the message, at least three devices in the bluetooth low energy mesh network can directly receive the message broadcasted by the bluetooth tag. Here, the direct reception means that the device does not receive the message broadcasted by the bluetooth tag via the relay of the other device, but directly scans for the message broadcasted by the bluetooth tag. Each device that directly receives a message records in the message the received signal strength indication value of the received message. The device may be a light gateway or a gateway. In the case where the device is a light gateway, the message recorded with the received signal strength indication value is uploaded to the cloud server via a relay of the gateway (or other light gateways and gateways). And under the condition that the equipment is a gateway, directly uploading the message recorded with the received signal strength indicating value to a cloud server.

In step S302, the cloud server determines location information of the bluetooth tag according to the obtained received signal strength indication value and preset location information of at least three devices.

Specifically, first, for each of at least three devices, a distance between the device and a bluetooth tag is determined according to a received signal strength indication value of a message from the bluetooth tag received by the device. Then, the position information of the Bluetooth tag is determined according to the distance between each of the at least three devices and the Bluetooth tag and the preset position information of the at least three devices.

The distance between the device and the bluetooth tag may be calculated by:

d＝10^((abs(RSSI)-A)/(10*n))

where d denotes a distance between the device and the bluetooth tag, RSSI denotes a received signal strength indication value (negative value) when the device receives a message from the bluetooth tag, a denotes a signal strength when the bluetooth tag and the device are separated by 1 meter, and n denotes an environmental attenuation factor.

After the distance between each device of the at least three devices and the Bluetooth tag is obtained, a circle is drawn by taking each device as the center, and the intersection of the three circles is the position of the Bluetooth tag.

According to the method, the cloud server obtains the position information of the Bluetooth tag by using the geometrical relationship by using the received signal strength indicating values of the messages from the Bluetooth tag, which are received by at least three devices in the Bluetooth mesh network, and combining the position information of the devices which is stored in advance. Therefore, the method provides a reliable positioning method of the Bluetooth tag.

Although the embodiments of the present invention have been disclosed, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be apparent to persons skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A heat dissipation mechanism provided on a housing, the heat dissipation mechanism comprising a heat dissipation portion, the heat dissipation portion comprising:

2. The heat dissipation mechanism according to claim 1, wherein the blocking mechanism includes:

3. The heat dissipation mechanism according to claim 2, wherein the heat dissipation portion further includes:

4. The heat dissipation mechanism of claim 2, wherein the blocking mechanism comprises a first blocking mechanism and/or a second blocking mechanism,

the first blocking mechanism includes:

the second stopper mechanism includes:

5. The heat dissipation mechanism according to claim 4, wherein the heat dissipation mechanism includes a plurality of heat dissipation portions provided on the same side wall of the housing.

6. The heat dissipation mechanism of claim 5,

the heat dissipation portions having the first barrier portions are arranged side by side in one region of the side wall, and the heat dissipation portions having the second barrier portions are arranged side by side in another region of the side wall.

7. The heat dissipation mechanism of claim 5,

a plurality of heat dissipation parts having first barrier parts and a plurality of heat dissipation parts having second barrier parts are alternately disposed on the sidewalls.

8. The heat dissipating mechanism of any one of claims 1 to 7, further comprising heat dissipating holes formed in a bottom wall of the housing, the heat dissipating holes communicating with an inner cavity of the housing.

9. A gateway, characterized in that the housing of the gateway is provided with a heat dissipation mechanism as claimed in any one of claims 1 to 8.

10. A light gateway, characterized in that the housing of the light gateway is provided with a heat dissipation mechanism as claimed in any one of claims 1 to 8, the light gateway having only a partial functionality of the gateway.