Relay protection device for power distribution network

Abstract

A relay protection device for a power distribution network comprises a cabinet body and a plurality of cavities distributed in the cabinet body, a negative pressure mechanism connected with air outlets of all the cavities is further arranged on the back side of the cabinet body, the negative pressure mechanism comprises a negative pressure cylinder, one side of the negative pressure cylinder is a circular pipe section connected with all the air outlets, the other side of the negative pressure cylinder is a gradually-expanding section, and the gradually-expanding section is connected with the air outlets of all the cavities. The divergent section is connected with an air inlet of a negative pressure fan; a rotating shaft distributed in the axial direction of the negative pressure cylinder is arranged in the negative pressure cylinder. One end of the rotating shaft extends out of a divergent section and then is connected with a driving piece. An air distribution disc and a spring are arranged on the rotating shaft, the spring is used for jacking the air distribution disc into the round pipe section, the outer diameter of the air distribution disc corresponds to the inner diameter of the round pipe section, the air distribution disc can be attached to the inner wall of the round pipe section to slide along the rotating shaft, air distribution holes are formed in the air distribution disc, and the air distribution holes are used for sequentially communicating parts of the exhaust outlets with the gradually-expanding section in the process that the air distribution disc rotates along with the rotating shaft. According to the invention, air flow in the cavity is facilitated to dissipate heat, and the negative pressure utilization rate is improved to save energy.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution network, in particular to a relay protection device used in power distribution network. Background Art

[0002] A variety of electrical components are usually arranged in a relay protection cabinet, and the electrical components will generate a lot of heat during operation, and usually require external mechanisms to dissipate heat so that each component is in a normal working state. For example, CN117277206B discloses a relay protection device for a distribution network, which controls the motor to rotate at a high speed. When the air intake at the ring piece is insufficient to meet the operating requirements of the negative pressure component, the ring piece and the sliding negative pressure pipe compress the second spring and move into the fixed negative pressure pipe, so that the third negative pressure groove of the four groups corresponds to the first negative pressure groove of the four groups, and air flows inside the heat dissipation chambers of the four groups at the same time. When the motor is controlled to rotate at a low speed, the negative pressure generated by the negative pressure component is small, which is insufficient to make the ring piece and the sliding negative pressure pipe overcome the resistance of the second spring and move into the fixed negative pressure pipe. At this time, the second negative pressure groove corresponds to the first negative pressure groove of the four groups. At the same time, when the linkage mechanism drives the rotating negative pressure pipe to rotate, the heat dissipation chambers of the four groups circulate air, and the wind entering the heat dissipation chamber stays for a short time and cooperates with the corrugated sheet to achieve a high heat dissipation effect and save energy.

[0003] However, the negative pressure pipe in the above technical solution is not directly connected to the chamber, which causes the negative pressure generated by the negative pressure fan to leak, and the negative pressure cannot be effectively utilized, which is not conducive to the flow of air in the chamber and is not conducive to energy saving. Summary of the invention

[0004] The present invention aims to provide a relay protection device for a power distribution network, which facilitates air flow in a chamber to dissipate heat and improves negative pressure utilization to save energy.

[0005] In order to solve the above technical problems, the specific scheme adopted by the present invention is: a relay protection device for a power distribution network, comprising a cabinet and a plurality of chambers for installing components distributed in the cabinet, wherein the plurality of chambers have air inlets and air outlets, and the air outlets of all the chambers are concentrated in the middle of the back side of the cabinet, and a negative pressure mechanism connected to all the air outlets is also provided on the back side of the cabinet, and the negative pressure mechanism is used to extract the gas in the chamber through the corresponding air outlet to achieve heat dissipation of the components in the chamber, and the negative pressure mechanism comprises a negative pressure cylinder with both ends closed, one side of the negative pressure cylinder is a circular tube section, the circular tube section is connected to all the air outlets, and the other side of the negative pressure cylinder is a gradually expanding section, and the gradually expanding section is connected to the air inlet of a negative pressure fan;

[0006] The negative pressure cylinder is provided with a rotating shaft distributed along its own axial direction, and one end of the rotating shaft extends out from the gradually expanding section and is connected to the driving member; an air distribution plate and a spring are provided on the rotating shaft, and the spring is used to push the air distribution plate into the circular tube section. The outer diameter of the air distribution plate corresponds to the inner diameter of the circular tube section, and can slide along the rotating shaft in accordance with the inner wall of the circular tube section. The air distribution hole is provided on the air distribution plate, and the air distribution hole is used to connect part of the exhaust port with the gradually expanding section in sequence when the air distribution plate rotates with the rotating shaft.

[0007] Preferably, all chambers are distributed in two layers, the air inlets of the upper chambers are opened on the top wall of the cabinet, and the air inlets of the lower chambers are opened on the bottom wall of the cabinet.

[0008] Preferably, a plurality of air guide plates distributed in the horizontal direction are provided at intervals in any chamber, and adjacent air guide plates are staggered end to end so that air enters the chamber from the air inlet and is discharged from the air outlet along a zigzag path.

[0009] Preferably, the bottom of the cabinet has feet for lifting the air inlet below.

[0010] Preferably, the air outlet and the air distribution holes are both arc-shaped and distributed with the center of the rotating shaft as the center of the circle.

[0011] Preferably, the number of the exhaust ports is four, and the four exhaust ports are evenly spaced around the rotating shaft; the number of the branch air holes is two, and the two branch air holes are symmetrically distributed.

[0012] Preferably, the driving member is a main shaft of the negative pressure fan, and a speed reducer is provided between the main shaft and the rotating shaft.

[0013] Preferably, a dustproof net is provided at the air inlet.

[0014] The negative pressure fan in the present invention is directly connected to the exhaust port of the chamber through the negative pressure cylinder. The negative pressure generated by the negative pressure fan can directly act on the chamber, which is beneficial to the circulation of gas in the chamber and improves the heat dissipation effect on the one hand, and is beneficial to reducing the energy consumption and heat generation of the negative pressure fan on the other hand. Furthermore, an air distribution plate that can automatically move with the rotation speed of the negative pressure fan is provided in the negative pressure cylinder, which can circulate and ventilate each chamber in turn when the outside temperature is low and the rotation speed of the negative pressure fan is low, so as to save energy. At the same time, all chambers can also be ventilated at the same time when the negative pressure fan rotates at a high speed, achieving a good heat dissipation effect.

[0015] Furthermore, in each chamber of the present invention, staggered air guide plates are arranged to form a zigzag air guide path, and the air inlet and air outlet of the chamber are respectively arranged at the two ends of the zigzag air guide path, so that the air at each position in the chamber is forced to circulate in one direction under the action of negative pressure, thereby achieving better heat dissipation effect.

[0016] Furthermore, the exhaust port and the air distribution hole in the present invention are both arc-shaped. When the air distribution hole rotates with the air distribution disk, the exhaust port of similar area is always connected to the negative pressure, thereby avoiding the pulse airflow caused by the complete closure of the air inlet of the negative pressure fan, and thus avoiding the unstable operation and reduced service life of the negative pressure fan caused by the pulse airflow. At the same time, it also reduces the impact and vibration of the cabinet and components inside the cabinet caused by the pulse airflow, thereby ensuring a stable working environment for the components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 A partial enlarged schematic diagram of the negative pressure system part;

[0019] Figure 3 for Figure 2 Schematic diagram of the state of the air distribution plate when the negative pressure fan rotates at a low speed;

[0020] Figure 4 for Figure 2 Schematic diagram of the state of the air distribution plate when the negative pressure fan rotates at high speed;

[0021] Figure 5 for Figure 2 AA section structural diagram;

[0022] Figure 6 for Figure 5 Schematic diagram of the state after the air distribution disk in the figure rotates about 45° in the counterclockwise direction;

[0023] Markings in the figure: 1. partition, 2. cabinet door, 3. air inlet, 4. air guide plate, 5. chamber, 6. cabinet body, 7. exhaust outlet, 8. negative pressure mechanism, 9. foot, 10. negative pressure cylinder, 1001. circular pipe section, 1002. gradually expanding section, 11. air inlet, 12. negative pressure fan, 13. driving motor, 14. main shaft, 15. exhaust outlet, 16. reducer, 17. rotating shaft, 18. spring, 19. air distribution plate, 20. ventilation gap, 21. air distribution hole. DETAILED DESCRIPTION

[0024] like Figure 1As shown, a relay protection device for a power distribution network of the present invention comprises a cabinet 6 having a cabinet door 2. The cabinet 6 is provided with a partition 1 distributed in the horizontal and vertical directions, and the partition 1 divides the inner cavity of the cabinet 6 into four independent and closed chambers 5. A plurality of air guide plates 4 distributed in the horizontal direction are provided in each chamber 5, and the air guide plates 4 can be used as a base for components to be installed to achieve a supporting effect. More importantly, the adjacent air guide pipes in the same chamber 5 are staggered and distributed head to tail, forming a zigzag flow path for air circulation in the chamber 5, and an air inlet 3 is opened on the wall of the cabinet 6 at the outer edge position of all flow paths, and a filter screen (not shown in the figure) is set at the air inlet 3 to prevent large particles of dust from entering, and an exhaust port 7 is opened near the center of the back side of the cabinet 6. Through the above structure, after a negative pressure mechanism 8 is set near the center of the back side of the cabinet 6 and is connected to the four exhaust ports 7 respectively, forced air flow at each position in each chamber 5 is achieved, resulting in a better heat dissipation effect. It should be noted that, in order to allow the two air inlets 3 at the bottom of the cabinet 6 to smoothly take in air, lifting feet 9 are fixedly provided at the four corners of the cabinet 6 .

[0025] like Figure 2 As shown, the negative pressure system of the present invention mainly includes a negative pressure fan 12 and a negative pressure cylinder 10. The negative pressure cylinder 10 also includes a circular tube section 1001 located on the left and a gradually expanding section 1002 located on the right. The left end of the circular tube section 1001 is closed, and the closed part is connected to four air inlets 3; the right end of the gradually expanding section 1002 is closed and connected to the air inlet 11 of the negative pressure fan 12. The negative pressure fan 12 is a conventional centrifugal fan in the art, and the part of its main shaft 14 located in the casing is provided with blades. After the main shaft 14 is driven to rotate by the driving motor 13, air is sucked in from the air inlet 11 through the blades, and the air is discharged from the exhaust port 15. In the process, negative pressure is generated in the air inlet 11 and the negative pressure cylinder 10.

[0026] A rotating shaft 17 is concentrically provided in the negative pressure cylinder 10. The part of the rotating shaft 17 located in the negative pressure cylinder 10 is provided with an air distribution plate 19 and a spring 18 from left to right. The right end of the rotating shaft 17 passes through the gradually expanding section 1002 and is connected to the main shaft 14 of the negative pressure fan 12 through a reducer 16.

[0027] The center hole of the air distribution plate 19 is opened and slidably connected to the rotating shaft 17, and a spline structure is provided between the center hole of the air distribution plate 19 and the rotating shaft 17, so that the air distribution plate 19 can also slide along the rotating shaft 17 under the action of external force. Figure 5 As shown, two symmetrically distributed air distribution holes 21 are provided on the air distribution plate 19. The two air distribution holes 21 are both arc-shaped and are distributed with the center of the rotating shaft 17 as the center of the circle. The four air outlets 7 of the present invention are also arc-shaped and are evenly spaced and distributed with the center of the rotating shaft 17 as the center of the circle. Figure 5In the state shown, the upper left and lower right two air outlets 7 are connected to the negative pressure of the gradually expanding section 1002 through the corresponding air distribution holes 21. As the rotating shaft 17 drives the air distribution plate 19 to rotate, the two air distribution holes 21 always connect the air inlet 3 with the negative pressure of the gradually expanding section 1002. Figure 6 In the state shown, half of the two air outlets 7 on the left are connected to the negative pressure of the gradually expanding section 1002 through the air distribution holes 21 on the left, and half of the two air outlets 7 on the right are connected to the negative pressure of the gradually expanding section 1002 through the air distribution holes 21 on the right. As a result, it is not easy to generate violent pulse airflow in the negative pressure cylinder 10, which prolongs the service life of the negative pressure fan 12 and prevents the pulse airflow from impacting the cabinet 6 and causing damage to the components of the cabinet 6.

[0028] The implementation process of the present invention is as follows:

[0029] In winter, at low temperatures, the drive motor 13 is rotated at a low speed. Figure 2 In the state shown, the negative pressure generated by the negative pressure fan 12 pulls the air distribution plate 19 to the right Figure 3 The four exhaust ports 7 are connected to the negative pressure through the air distribution holes 21 in turn, and the four chambers 5 are exhausted and heat dissipated in turn. Under high temperature conditions in summer, the drive motor 13 is turned on at high speed, and the negative pressure fan 12 generates a greater negative pressure, causing the air distribution plate 19 to continue to move right to Figure 4 At this time, on the one hand, the air distribution plate 19 is separated from all the exhaust ports 7, so that the four chambers 5 can be connected to the negative pressure through the two air distribution holes 21. On the other hand, because the air distribution plate 19 enters the gradually expanding section 1002, a ventilation gap 20 is generated between the outer wall of the air distribution plate 19 and the inner wall of the gradually expanding section 1002. Since the ventilation gap 20 is annular and circumferentially distributed around the air distribution plate 19, the connection area between the four chambers 5 and the negative pressure is increased, and the air flow rate in the chamber 5 is further increased, so that the components in the chamber 5 can achieve a better heat dissipation effect.

Claims

1. A relay protection device for a power distribution network, comprising a cabinet (6) and a plurality of chambers (5) for installing components distributed in the cabinet (6), wherein the plurality of chambers (5) are provided with air inlets (3) and air outlets (7), wherein the air outlets (7) of all the chambers (5) are concentrated in the middle of the back side of the cabinet (6), and a negative pressure mechanism connected to all the air outlets (7) is further provided on the back side of the cabinet (6), wherein the negative pressure mechanism is used to extract gas in the chamber (5) through the corresponding air outlet (7) to achieve heat dissipation of the components in the chamber (5), and wherein: The negative pressure mechanism (8) comprises a negative pressure cylinder (10) with both ends closed, one side of the negative pressure cylinder (10) is a circular tube section (1001), the circular tube section (1001) is connected to all the exhaust ports (7), and the other side of the negative pressure cylinder (10) is a gradually expanding section (1002), the gradually expanding section (1002) is connected to the air inlet (11) of a negative pressure fan (12); The negative pressure cylinder (10) is provided with a rotating shaft (17) distributed along its own axial direction, and one end of the rotating shaft (17) extends out from the gradually expanding section (1002) and is connected to the driving member; an air distribution plate (19) and a spring (18) are provided on the rotating shaft (17), and the spring (18) is used to push the air distribution plate (19) into the circular tube section (1001), and the outer diameter of the air distribution plate (19) corresponds to the inner diameter of the circular tube section (1001), and can fit the inner wall of the circular tube section (1001) and slide along the rotating shaft (17); an air distribution hole (21) is provided on the air distribution plate, and the air distribution hole (21) is used to sequentially connect part of the exhaust port (7) with the gradually expanding section (1002) during the process of the air distribution plate (19) rotating with the rotating shaft (17).

2. A relay protection device for a power distribution network as claimed in claim 1, characterized in that: All chambers (5) are distributed in two layers, the air inlets (3) of the upper chambers (5) are opened on the top wall of the cabinet (6), and the air inlets (3) of the lower chambers (5) are opened on the bottom wall of the cabinet (6).

3. A relay protection device for a power distribution network as claimed in claim 2, characterized in that: A plurality of air guide plates (4) distributed in a horizontal direction are arranged at intervals in any chamber (5), and adjacent air guide plates (4) are arranged in a staggered manner end to end so that air enters the chamber (5) through the air inlet (3) and is then discharged from the air outlet (7) along a zigzag path.

4. A relay protection device for a power distribution network as claimed in claim 2, characterized in that: The bottom of the cabinet (6) is provided with feet (9) for lifting the air inlet (3) below.

5. A relay protection device for a power distribution network as claimed in claim 1, characterized in that: The air outlet (7) and the air distribution holes (21) are both arc-shaped and distributed with the center of the rotating shaft (17) as the center of the circle.

6. A relay protection device for a power distribution network as claimed in claim 5, characterized in that: The number of the exhaust ports (7) is four, and the four exhaust ports (7) are evenly spaced and distributed around the rotating shaft (17); The number of the air distribution holes (21) is two, and the two air distribution holes (21) are symmetrically distributed.

7. A relay protection device for a power distribution network as claimed in claim 1, characterized in that: The driving member is a main shaft (14) of the negative pressure fan (12), and a speed reducer (16) is provided between the main shaft (14) and the rotating shaft (17).

8. A relay protection device for a power distribution network as claimed in claim 1, characterized in that: A dust screen is provided at each air inlet (3).

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