Water blocking structure and power converter

Abstract

The utility model provides a water blocking structure and a power converter. The water blocking structure comprises an air duct, a first air inlet and a first air outlet are formed in the air duct, and the first air outlet is constructed to be communicated with a second air inlet of an installation main body so as to cool the installation main body; the protection unit has a shielding state for shielding air entering the air duct and an avoiding state for avoiding the air entering the air duct, when the protection unit is in the shielding state, the length of the shortest path of movement of the air in the air duct is L1, and when the protection unit is in the avoiding state, the length of the shortest path of movement of the air in the air duct is L2. The length of the shortest path of air moving in the air channel is L2, and L1 is larger than L2. According to the technical scheme of the utility model, the problem of resource waste caused by the fact that a fan with higher power and rotating speed needs to be selected in order to meet the heat dissipation requirement of the power converter on the premise that the waterproof effect of the water blocking structure of the existing power converter is ensured by using a baffle plate can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation equipment, and in particular, to a water-blocking structure and a power converter. Background Art

[0002] When an air-cooled heat dissipation power converter of the prior art works, external air is sucked by a fan of the power converter through a baffle from an air inlet and directly blows on a radiator, exchanges heat with the radiator to take away the heat generated by semiconductor power devices, completes the cooling of the semiconductor power devices, and then flows out of the power converter through a reactor from an air outlet. When a liquid-cooled heat dissipation power converter of the prior art works, external air is sucked by a fan of the power converter through a baffle from an air inlet and directly blows on a heat exchanger, exchanges heat with the heat exchanger to complete the cooling of a cooling medium, and then flows out of the power converter from the air outlet, while the low-temperature cooling medium enters a liquid-cooled plate through a pipeline to complete the cooling of the semiconductor power devices.

[0003] With the increase of the power of the power converter, the heat flux density is getting higher and higher. For an air-cooled heat dissipation power converter or a liquid-cooled heat dissipation power converter, the external air volume needs to be increased, and more external air needs to enter the machine. However, in the actual operation process, when the power converter operates in a relatively humid environment (such as on a rainy day), water will be sucked into the machine along with the external air, bringing potential safety hazards and affecting the service life of the whole machine. Although adding a baffle structure at the air inlet can achieve a waterproof effect, it will increase the air resistance of the whole air duct, resulting in a decrease in the air volume entering the machine. At this time, on the premise of ensuring the waterproof effect, in order to meet the heat dissipation requirements of the power converter, a fan with a larger power and higher speed needs to be selected, resulting in waste of resources. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a water-blocking structure and a power converter, which can solve the problem that when the water-blocking structure of the existing power converter uses a baffle to ensure the waterproof effect, in order to meet the heat dissipation requirements of the power converter, a fan with a larger power and higher speed needs to be selected, resulting in waste of resources.

[0005] To achieve the above purpose, according to one aspect of the utility model, a water-blocking structure is provided, including: an air duct having a first air inlet and a first air outlet, and the first air outlet is configured to communicate with a second air inlet of an installation main body to cool the installation main body; at least one protection unit, the protection unit having a shielding state of shielding the air entering the air duct and an avoidance state of avoiding the air entering the air duct. When the protection unit is in the shielding state, the length of the shortest path of the air moving in the air duct is L1, and when the protection unit is in the avoidance state, the length of the shortest path of the air moving in the air duct is L2, and L1 > L2.

[0006] Further, the protection unit is rotatably arranged in the air duct to switch between a blocking state and an avoidance state.

[0007] Further, the water blocking structure further includes a first rotating shaft and a first driving structure. The first rotating shaft is installed on the side wall of the air duct, the protection unit is connected to the first rotating shaft, and the first driving structure is used to drive the protection unit to rotate around the central axis of the first rotating shaft.

[0008] Further, the water blocking structure further includes a spring shaft and a second driving structure. The spring shaft is installed in the air duct, or at the first air inlet, or at the first air outlet. The protection unit is connected to the spring shaft. The second driving structure is made of a water-absorbing material and is installed on the protection unit. The second driving structure can drive the protection unit to rotate.

[0009] Further, there are two protection units, and the two protection units are arranged on opposite sides of the air duct. When both protection units are in the blocking state, there is a first air inlet gap between one protection unit and the side wall of the air duct, and a second air inlet gap between the other protection unit and the side wall of the air duct. And along the air inlet direction, there is a third air inlet gap between the two protection units. The first air inlet gap, the second air inlet gap, and the third air inlet gap are connected; or, a third air inlet is provided on the protection unit.

[0010] Further, both the protection unit and the first driving structure are multiple, and the protection unit and the first driving structure are arranged in correspondence.

[0011] Further, the protection unit is configured to be able to extend into or out of the air duct by a preset length relative to the side wall of the air duct at its installation position to switch between a blocking state and an avoidance state.

[0012] Further, the number of the first air inlets is at least two. A closing structure is provided at at least one first air inlet, and a protection unit is provided at at least one first air inlet. The closing structure has a closed state of closing the first air inlet at its position and an open state of opening the first air inlet at its position. When the first air inlet closed by the closing structure is opened, the number of bends of the first path through which the air flow entering through this first air inlet passes is N1. When the first air inlet blocked by the protection unit is opened, the number of bends of the second path through which the air flow entering through this first air inlet passes is N2, and N1 < N2.

[0013] Further, the water blocking structure further includes a second rotating shaft and a third driving structure. The second rotating shaft is installed in the air duct, or at the first air inlet, or at the first air outlet. The closing structure is connected to the second rotating shaft, and the third driving structure is used to drive the closing structure to rotate around the central axis of the second rotating shaft so that the closing structure switches between a closed state and an open state.

[0014] According to another aspect of the present invention, a power converter is provided, comprising: the above-mentioned water-blocking structure; an installation body, comprising an installation cavity, a second air inlet and a second air outlet, the second air inlet and the second air outlet being both connected to the installation cavity, the installation body forming the outer shell of the power converter; a semiconductor power device; and a reactor, wherein the semiconductor power device and the reactor are both installed in the installation cavity.

[0015] By applying the technical solution of the present invention, an air duct and at least one protective unit are provided. When the water-blocking structure of the present application works in a relatively humid environment, the protective unit is in a shielding state, which can effectively prevent water from entering the air duct with the external wind. When the water-blocking structure of the present application works in a relatively dry environment, the protective unit is in an avoidance state, which can reduce the wind resistance of the protective unit to the external wind, so that the air volume entering the air duct can meet the heat dissipation requirements, that is, the fan can provide the air volume required for heat dissipation under a low duty cycle state, and there is no need to select a fan with larger power and speed to meet the heat dissipation requirements, thereby saving resources and avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of the protective unit of the water-blocking structure of the first embodiment of the present invention is shown in a shielding state;

[0018] Figure 2 A schematic structural diagram of the protection unit of the water-blocking structure of the first embodiment of the present utility model when in an avoidance state is shown;

[0019] Figure 3 A schematic structural diagram showing the protective unit of the water-blocking structure of the second embodiment of the present invention when in a shielding state;

[0020] Figure 4 A schematic structural diagram showing a protection unit of the water-blocking structure of the second embodiment of the present invention in an avoidance state;

[0021] Figure 5 A schematic structural diagram showing the protective unit of the water-blocking structure of the third embodiment of the present invention in a shielding state is shown;

[0022] Figure 6 It shows a structural schematic diagram of the protection unit of the water-blocking structure of the third embodiment of the present invention when it is in an avoidance state.

[0023] The above drawings include the following reference numerals:

[0024] 10. Installation main body; 11. Installation cavity; 12. First air inlet; 31. First rotating shaft; 32. Protection unit; 40. Sealing structure; 41. Second rotating shaft; 50. Second driving structure; 60. Spring shaft. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] With reference to Figures 1 to 6 As shown, the present utility model provides a water blocking structure, which includes: an air duct having a first air inlet 12 and a first air outlet, and the first air outlet is configured to communicate with a second air inlet of the installation main body 10 to cool the installation main body 10; at least one protection unit 32, the protection unit 32 has a blocking state of blocking the wind entering the air duct and an avoidance state of avoiding the wind entering the air duct. When the protection unit 32 is in the blocking state, the length of the shortest path of the wind moving in the air duct is L1, and when the protection unit is in the avoidance state, the length of the shortest path of the wind moving in the air duct is L2, and L1 > L2.

[0027] In this embodiment, when the protection unit 32 is in the avoidance state, the moving path of the wind entering the air duct in the air duct is straight or nearly straight. When the protection unit 32 is in the blocking state, the protection unit 32 can block part of the wind entering the air duct, so that the moving path of the wind entering the air duct in the air duct is curved. The installation main body 10 can be the housing of power conversion devices such as power distribution cabinets, transformers, inverters, converters, and charging piles. When the water blocking structure of the present application works in a relatively humid environment, the protection unit 32 is in the blocking state, so that the wind entering from the first air inlet flows in the air duct along an S-shaped or folded-back path, which can effectively reduce the probability of water droplets entering the installation main body 10, and further effectively prevent water from entering the air duct along with the external wind; when the water blocking structure of the present application works in a relatively dry environment and no water blocking is required, the protection unit 32 is in the avoidance state to reduce the wind resistance of the protection unit 32 to the external wind. At this time, the external wind enters the air duct along a straight line or nearly a straight line, so that the air volume entering the air duct can meet the heat dissipation requirements. At this time, the fan can provide the air volume required for heat dissipation in a low duty cycle state, and there is no need to select a fan with a larger power and speed to meet the heat dissipation requirements, thereby saving resources and avoiding waste of resources. As can be seen from the above, for the use environment that does not require waterproofing, the water blocking structure of the present application can be adjusted to a mode with a smaller wind resistance (that is, the protection unit 32 is in the avoidance state), so that the fan can achieve heat dissipation in a low duty cycle state, saving resources.

[0028] In one embodiment, the water-blocking structure and the mounting body 10 are an integral structure.

[0029] In one embodiment of the present utility model, the protection unit 32 is rotatably arranged in the air duct to switch between a shielding state and an avoidance state.

[0030] Through the above arrangement, the protection unit 32 can be switched between the shielding state and the avoidance state.

[0031] With reference to Figure 1 and Figure 2 As shown, in one embodiment of the present utility model, the water-blocking structure further includes a first rotating shaft 31 and a first driving structure. The first rotating shaft 31 is installed on the side wall of the air duct, the protection unit 32 is connected to the first rotating shaft 31, and the first driving structure is used to drive the protection unit 32 to rotate around the central axis of the first rotating shaft 31.

[0032] [[ID=I6]]In this embodiment, the protection unit 32 is rotatably connected or fixedly connected to the first rotating shaft 31. There are two cases for the rotatable connection between the protection unit 32 and the first rotating shaft 31. The first case is that the first rotating shaft 31 is fixed, and under the drive of the first driving structure, the protection unit 32 can rotate relative to the first rotating shaft 31 around the central axis of the first rotating shaft 31. The second case is that the first rotating shaft 31 is rotatable, and under the drive of the first driving structure, the protection unit 32 and the first rotating shaft 31 rotate together; when the protection unit 32 is fixedly connected to the first rotating shaft 31, the first rotating shaft 31 rotates synchronously with the protection unit 32 under the drive of the first driving structure.

[0033] With reference to Figure 3 and Figure 4 As shown, in one embodiment of the present utility model, the water-blocking structure further includes a spring shaft 60 and a second driving structure 50. The spring shaft 60 is installed in the air duct or at the first air inlet 12 or the first air outlet. The protection unit 32 is connected to the spring shaft 60. The second driving structure 50 is made of a water-absorbing material and is installed on the protection unit 32. The second driving structure 50 can drive the protection unit 32 to rotate.

[0034] In this embodiment, when the water-blocking structure of the present application works in a relatively humid environment, after the water-absorbing material absorbs water, its weight becomes larger. The protection unit 32 is driven by the gravity of the water-absorbing material to rotate, so that the protection unit 32 is in the shielding state to achieve water blocking. At this time, the spring shaft 60 is stretched. When the working environment of the water-blocking structure changes from a humid state to a dry state, the water in the water-absorbing material gradually dries, and the weight of the water-absorbing material gradually decreases. At this time, under the elastic restoring force of the spring shaft 60, the protection unit 32 rotates, and the protection unit 32 is switched from the shielding state to the avoidance state. Through the above arrangement, the protection unit 32 can be switched between the shielding state and the avoidance state.

[0035] In one embodiment, the water-absorbing material is any one of a sponge, a water-absorbing resin and a porous material.

[0036] In one embodiment, the installation body 10 is a charging pile, which is mostly installed outdoors. For waterproof considerations, a second air inlet is opened on the vertical side of the charging pile, and the first air outlet is connected to the first air inlet 12 of the charging pile. The first air inlet 12 can be set below the second air inlet, or the first air inlet 12 and the second air inlet are spaced apart in the horizontal direction.

[0037] See also Figures 1 to 6 As shown, in one embodiment of the present invention, there are two protective units 32, and the two protective units 32 are arranged on opposite sides of the air duct. When the two protective units 32 are in a blocking state, there is a first air inlet gap between one of the protective units 32 and the side wall of the air duct, and a second air inlet gap between the other protective unit 32 and the side wall of the air duct, and along the air inlet direction, there is a third air inlet gap between the two protective units 32, and the first air inlet gap, the second air inlet gap and the third air inlet gap are connected.

[0038] In this embodiment, two protective units 32 are provided on opposite sides of the air duct, spaced apart vertically. A first air inlet gap, a third air inlet gap, and a second air inlet gap are arranged in sequence vertically. When both protective units 32 are in the blocking state, air entering the air duct passes through the first air inlet gap, the third air inlet gap, and the second air inlet gap in sequence. This arrangement allows air entering the air duct to flow along an S-shaped path, improving the water-blocking effect.

[0039] In one embodiment of the present invention, a third air inlet is provided on the protection unit 32. Through the above arrangement, the air intake efficiency can be improved while ensuring the water blocking effect.

[0040] In one embodiment of the present invention, there are multiple protection units 32 and multiple first drive structures, and the protection units 32 and the first drive structures are arranged correspondingly. Through the above arrangement, the water blocking effect can be further improved.

[0041] In one embodiment of the present invention, the protection unit 32 is configured to extend into or out of the air duct by a preset length relative to the side wall of the air duct at its installation position, so as to switch between a shielding state and an avoiding state.

[0042] Through the above configuration, the protection unit 32 can be switched between the shielding state and the avoiding state.

[0043] See also Figure 5 and Figure 6As shown in the figure, in an embodiment of the present utility model, the number of the first air inlets 12 is at least two. A closing structure 40 is provided at at least one of the first air inlets 12, and a protection unit 32 is provided at at least one of the first air inlets 12. The closing structure 40 has a closed state in which the first air inlet 12 at its position is closed and an open state in which the first air inlet 12 at its position is opened. When the first air inlet closed by the closing structure 40 is opened, the number of bends of the first path through which the air flow entering via the first air inlet 12 passes is N1. When the first air inlet 12 blocked by the protection unit 32 is opened, the number of bends of the second path through which the air flow entering via the first air inlet 12 passes is N2, and N1 < N2.

[0044] In this embodiment, when the water blocking structure is in a relatively dry working environment, the closing structure 40 can be in an open state and the protection unit 32 can be in an avoidance state. At this time, at least two first air inlets 12 can achieve air intake, thereby improving the air intake efficiency. When the water blocking structure is in a relatively humid working environment, the closing structure 40 is in a closed state and the protection unit 32 is in a blocking state to block water.

[0045] Combined with reference to Figure 5 and Figure 6 As shown in the figure, in an embodiment of the present utility model, the water blocking structure further includes a second rotating shaft 41 and a third driving structure. The second rotating shaft 41 is installed in the air duct or at the first air inlet 12 or at the first air outlet. The closing structure 40 is connected to the second rotating shaft 41. The third driving structure is used to drive the closing structure 40 to rotate around the central axis of the second rotating shaft 41 so that the closing structure 40 can be switched between the closed state and the open state.

[0046] Through the above settings, the switching between the closed state and the open state of the closing structure 40 can be realized.

[0047] In an embodiment, the third driving structure is a motor.

[0048] Combined with reference to Figure 1 、 Figure 2 、 Figure 5 as well as Figure 6 As shown in the figure, in an embodiment of the present utility model, the water blocking structure further includes a humidity detection device. The humidity detection device is installed outside the installation main body 10 and is used to detect the humidity level of the environment.

[0049] In an embodiment, the humidity detection device is a humidity sensor. Through the setting of the humidity sensor, the humidity level of the external environment can be monitored in real time, so as to adjust the state (i.e., the blocking state and the avoidance state) of the protection unit 32 according to the humidity level through the first driving structure.

[0050] In one embodiment of the present invention, the first driving structure is a motor, the water-blocking structure further includes a control system, the motor and the humidity detection device are both communicatively connected to the control system, and the humidity detection device is disposed at the first air inlet 12 .

[0051] In this embodiment, a humidity detection device is provided at the first air inlet 12. The humidity detection device is used to detect the humidity level at the first air inlet 12. If the humidity at the first air inlet 12 is high, the humidity detection device sends a signal to the control system, which in turn activates the motor, causing the motor to rotate the first rotating shaft 31, which in turn drives the protective unit 32 to rotate, thereby placing the protective unit 32 in a shielding state, thereby achieving water blocking. If the humidity at the first air inlet 12 is low, indicating that the working environment of the water-blocking structure is relatively dry, the humidity detection device sends a signal to the control system, which in turn controls the motor to drive the first rotating shaft 31 to rotate in the opposite direction, thereby switching the protective unit 32 from the shielding state to the avoidance state.

[0052] In one embodiment of the present invention, a water absorbing structure is provided on the windward side of the protection unit 32 .

[0053] Through the above arrangement, the water blocking capability of the protection unit 32 can be further enhanced.

[0054] In one embodiment, the water-absorbing structure is a polyacrylamide coating.

[0055] According to another aspect of the present invention, a power converter is also provided, including: the above-mentioned water-blocking structure; an installation body 10, including an installation cavity 11, a second air inlet and a second air outlet, the second air inlet and the second air outlet are both connected to the installation cavity 11, and the installation body 10 forms the outer shell of the power converter; a semiconductor power device; and a reactor, wherein the semiconductor power device and the reactor are both installed in the installation cavity 11.

[0056] In this embodiment, the water-blocking structure of the power converter has all the technical solutions and all the technical effects of the above-mentioned water-blocking structure, which will not be described in detail here.

[0057] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: an air duct and at least one protective unit are provided. When the water-blocking structure of the present application works in a relatively humid environment, the protective unit is in a shielding state, effectively preventing water from entering the air duct with the external wind. When the water-blocking structure of the present application works in a relatively dry environment, the protective unit is in an avoidance state, which can reduce the wind resistance of the protective unit to the external wind, so that the air volume entering the air duct can meet the heat dissipation requirements, that is, the fan can provide the air volume required for heat dissipation under a low duty cycle state, and there is no need to select a fan with larger power and speed to meet the heat dissipation requirements, thereby saving resources and avoiding waste of resources.

[0058] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-blocking structure, characterized in that, Including: An air duct having a first air inlet (12) and a first air outlet, and the first air outlet is configured to communicate with a second air inlet of the installation main body (10) to cool the installation main body (10). At least one protection unit (32), the protection unit (32) having a blocking state for blocking the air entering the air duct and an avoidance state for avoiding the air entering the air duct. When the protection unit (32) is in the blocking state, the length of the shortest path of the air moving in the air duct is L1, and when the protection unit (32) is in the avoidance state, the length of the shortest path of the air moving in the air duct is L2, and L1 > L2.

2. The water-blocking structure according to claim 1, characterized in that, The protection unit (32) is rotatably arranged in the air duct to switch between the blocking state and the avoidance state.

3. The water-blocking structure according to claim 2, characterized in that, The water blocking structure further includes a first rotating shaft (31) and a first driving structure. The first rotating shaft (31) is installed on the side wall of the air duct, the protection unit (32) is connected to the first rotating shaft (31), and the first driving structure is used to drive the protection unit (32) to rotate around the central axis of the first rotating shaft (31).

4. The water-blocking structure according to claim 2, wherein The water blocking structure further includes a spring shaft (60) and a second driving structure (50). The spring shaft (60) is installed in the air duct or at the first air inlet (12) or the first air outlet. The protection unit (32) is connected to the spring shaft (60). The second driving structure (50) is made of a water-absorbing material. The second driving structure (50) is installed on the protection unit (32), and the second driving structure (50) can drive the protection unit (32) to rotate.

5. The water-blocking structure according to claim 2, characterized in that There are two protection units (32), and the two protection units (32) are arranged on opposite sides of the air duct. When both of the two protection units (32) are in the blocking state, there is a first air inlet gap between one of the protection units (32) and the side wall of the air duct, and there is a second air inlet gap between the other protection unit (32) and the side wall of the air duct. And along the air inlet direction, there is a third air inlet gap between the two protection units (32), and the first air inlet gap, the second air inlet gap, and the third air inlet gap are connected; or, a third air inlet is provided on the protection unit (32).

6. The water-blocking structure according to claim 3, wherein Both the protection unit (32) and the first driving structure are multiple, and the protection unit (32) and the first driving structure are arranged in correspondence.

7. The water-blocking structure according to claim 1, wherein, The protection unit (32) is configured to be able to extend into or out of the air duct by a preset length with respect to the side wall of the air duct at its installation position to switch between the blocking state and the avoidance state.

8. The water-blocking structure according to any one of claims 1 to 7, characterized in that, The number of the first air inlets (12) is at least two. A closing structure (40) is provided at at least one of the first air inlets (12), and a protection unit (32) is provided at at least one of the first air inlets (12). The closing structure (40) has a closed state of closing the first air inlet (12) at its location and an open state of opening the first air inlet (12) at its location. When the first air inlet (12) closed by the closing structure (40) is opened, the number of bends of the first path through which the air flow entering through the first air inlet (12) passes is N1. When the first air inlet (12) blocked by the protection unit (32) is opened, the number of bends of the second path through which the air flow entering through the first air inlet (12) passes is N2, and N1 < N2.

9. The water-blocking structure according to claim 8, wherein The water blocking structure further includes a second rotating shaft (41) and a third driving structure. The second rotating shaft (41) is installed in the air duct, or at the first air inlet (12), or at the first air outlet. The closing structure (40) is connected to the second rotating shaft (41), and the third driving structure is configured to drive the closing structure (40) to rotate around the central axis of the second rotating shaft (41) so that the closing structure (40) can be switched between the closed state and the open state.

10. A power converter, characterized in that, Comprising: The water blocking structure according to any one of claims 1 to 9; An installation main body (10) including an installation cavity (11), the second air inlet and the second air outlet. Both the second air inlet and the second air outlet communicate with the installation cavity (11), and the installation main body (10) forms the housing of the power converter. A semiconductor power device; A reactor, and both the semiconductor power device and the reactor are installed in the installation cavity (11).

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