Direct current cabinet with multi-stage thermal control

Abstract

The invention relates to the technical field of direct current cabinets, and discloses a direct current cabinet with multistage thermal control. The cabinet comprises a cabinet body, wherein the cabinet body is provided with a main chamber and two side chambers; the main chamber is internally provided with a plurality of heat conducting frames and heat conducting plates which are used for installing electrical elements and conducting heat for the electrical elements, the two side chambers are each internally and rotatably provided with a cooling disc used for storing cooling liquid, and a first circulating pipeline and a second circulating pipeline are connected between the two cooling discs and the heat conducting frames and between the two cooling discs and the heat conducting plates, so that circulating cooling is achieved; an upper chamber and a lower chamber which are not communicated are arranged in the cooling disc, and a liquid inlet three-way pipe and a liquid outlet three-way pipe are fixedly arranged in the cooling disc. According to the water-cooling circulating system, the cooling disc with the two cavities is additionally arranged in the water-cooling circulating system, the two cavities serve as the circulating cavity and the standby cavity which can be switched mutually, the cooling pressure of cooling liquid is relieved in the mode that the two cavities are switched mutually, and therefore heat overload can be better coped with.

Description

Technical Field

[0001] The present invention relates to the technical field of DC cabinets, and in particular to a DC cabinet with multi-stage thermal control. Background Art

[0002] A DC cabinet is a complete set of electrical equipment specifically used to distribute, control, and protect DC power. It is widely used in power systems, industrial automation, new energy, communications, and other fields. Due to the presence of diverse heat sources within it, in order to ensure the stable operation and safety of the equipment, different cooling measures must be taken for components at different temperature levels to ensure that key components operate within a safe temperature range.

[0003] At present, a layered heat dissipation design is mainly adopted. For example, the primary heat source with the largest heat generation (IGBT module, SiC MOSFET, diode rectifier bridge, battery pack, etc.) usually adopts liquid cooling, the secondary heat source with medium heat generation (electrolytic capacitor, film capacitor) usually adopts air cooling, and the tertiary heat source (PCB) with smaller heat generation generally adopts thermal conduction cooling.

[0004] However, the multi-stage thermal control structures in existing DC cabinets mostly lack redundancy and cannot effectively cope with heat overload. As a result, once the heat of a certain level of heat source exceeds the temperature control upper limit of the temperature control and heat dissipation system due to an emergency, the cooling pressure is too high and it is impossible to respond in time to quickly reduce the temperature, which can easily lead to safety accidents. Therefore, it is necessary to propose a new multi-stage thermal control DC cabinet. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a DC cabinet with multi-stage thermal control.

[0006] The present invention is implemented by the following technical solutions: a cabinet body, the cabinet body is provided with a main chamber and two side chambers; The main chamber is equipped with multiple heat-conducting racks and heat-conducting plates for mounting and conducting heat to electrical components. The two side chambers are both equipped with rotating cooling disks for storing coolant. The first and second circulation pipelines are connected between the two cooling disks and the heat-conducting racks and heat-conducting plates to achieve circulation cooling. The cooling plate is provided with two unconnected upper and lower chambers. A liquid inlet tee pipe and a liquid outlet tee pipe are fixedly provided in the cooling plate, and the upper and lower ends of the liquid inlet tee pipe and the liquid outlet tee pipe extend into the two chambers respectively. In this way, one of the chambers can be used as a spare chamber, and the coolant circulation in the two chambers can be switched by rotating the cooling disk to alleviate the cooling burden.

[0007] As a further improvement of the above solution, the first circulation pipeline is connected in series with multiple heat conduction plates and communicated with two cooling disks, and the second circulation pipeline is connected in series with multiple heat conduction racks and communicated with two cooling disks.

[0008] As a further improvement of the above solution, the upper and lower ends of the liquid inlet tee are both provided with a first hollow sleeve that slides up and down, so as to control the flow path of the coolant and guide the coolant into the chamber below.

[0009] As a further improvement of the above solution, both upper and lower ends of the liquid outlet tee are provided with second hollow sleeves that slide up and down, thereby realizing the opening and closing switching of the two ports of the liquid outlet tee.

[0010] As a further improvement of the above scheme, a movable flow-limiting ball and two hollow plates for limiting the movable range of the flow-limiting ball are provided in the liquid inlet tee, so that when the circulating coolant enters the cooling disk through the liquid inlet tee, the flow-limiting ball limits the flow of the port below the liquid inlet tee, thereby realizing the diversion of the coolant and allowing it to flow into the upper and lower chambers respectively, thereby completing the switching of the upper and lower center of gravity of the cooling disk, and realizing the coolant circulation switching through rotation.

[0011] As a further improvement of the above scheme, two spiral columns are slidingly arranged in the liquid inlet tee, and one end of the two spiral columns is fixedly connected to the two first hollow sleeves respectively, so that the spiral column at the upper end of the liquid inlet tee increases the residence time of the coolant in the liquid inlet tee, so that it has more cooling time in the liquid inlet tee, avoiding thermal shock after mixing with the coolant in the chamber above, while the spiral column at the lower end of the liquid inlet tee allows the coolant to rotate and discharge to better mix with the chamber below, avoiding temperature stratification and affecting the circulation cooling effect of the coolant.

[0012] As a further improvement of the above solution, two upper and lower counterweights are provided on one side of the cooling plate, and the two counterweights are respectively positioned opposite to the upper and lower chambers, so that the cooling plate can smoothly rotate 180 degrees when switching between the two chambers, avoiding the cooling plate only rotating 90 degrees, causing the two chambers to change from being distributed up and down to being distributed left and right.

[0013] As a further improvement of the above solution, a plurality of heat dissipation holes are provided on the cooling plate, and two sets of upper and lower ventilation holes are provided on the cabinet body, which pass through the main chamber and the side chamber and are opposite to the two cooling plates, so as to improve the heat dissipation effect of the cooling plate and the cabinet body.

[0014] As a further improvement of the above solution, cooling fans are provided in both side chambers, and the two cooling fans and the two cooling plates are offset and aligned up and down, so as to further improve the heat dissipation effect of the cooling plates and the cabinet by utilizing the cooling fans.

[0015] Compared with the prior art, the present invention has the following beneficial effects: A cooling disk with redundant switching function is added to the water-cooled heat dissipation cycle. By dividing the internal space of the cooling disk into two chambers, and using the two chambers as a circulation chamber and a standby chamber that can be switched with each other, the coolant in one chamber is in a standby state while the coolant in the other chamber is in a heat dissipation cycle. This allows the coolant in the standby chamber to cool down for a longer time, thereby maintaining a low-temperature state. The cooling disk is rotated regularly to switch between the two chambers, thereby achieving cooling buffering and alleviating cooling pressure. By arranging a liquid inlet tee and a liquid outlet tee in the cooling disk, and arranging a first hollow sleeve and a second hollow sleeve on the ports of the two, the circulation switching of the coolant in the two chambers can be achieved with a simple structure without affecting the normal rotation of the cooling disk, greatly reducing the failure rate of the entire cooling disk; By installing a flow-limiting ball in the liquid inlet tee and a hollow plate to limit the range of movement of the flow-limiting ball, the circulating coolant can enter the upper and lower chambers simultaneously through diversion when entering the cooling plate. The center of gravity of the cooling plate is shifted by using this method, so that the entire cooling plate can automatically switch between the two chambers. This not only simplifies the structure, reduces the cost and energy consumption of the entire water-cooling structure, but also reduces the overall failure rate. By arranging a spiral column in the first hollow sleeve on the liquid inlet tee, the spiral column at the upper end of the liquid inlet tee can increase the residence time of the coolant in the liquid inlet tee, so that it has more cooling time in the liquid inlet tee, avoiding thermal shock after mixing with the low-temperature coolant in the chamber above. The spiral column at the lower end of the liquid inlet tee can allow the coolant to rotate and discharge to better mix with the chamber below, avoiding temperature stratification and affecting the circulation cooling effect of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing the overall structure of a DC cabinet with multi-stage thermal control according to the present invention; Figure 2 This is a diagram showing the DC cabinet with multi-stage thermal control with its cover removed; Figure 3 This is a front plan cross-sectional view of a DC cabinet with multi-stage thermal control according to the present invention; Figure 4 This is a front view showing the internal structure of the DC cabinet with multi-stage thermal control of the present invention; Figure 5 A rear view showing the internal structure of a DC cabinet with multi-stage thermal control according to the present invention; Figure 6 This is a disassembled display diagram of the DC cabinet with multi-stage thermal control of the present invention; Figure 7 A cross-sectional view of a cooling plate; Figure 8 A side cross-sectional plan view of the cooling plate; Figure 9 This is a cross-sectional view of the liquid inlet tee; Figure 10 This is a diagram showing the second circulation pipeline.

[0017] Description of main symbols: 1. Cabinet; 101. Main chamber; 102. Side chamber; 103. Ventilation port; 2. Heat-conducting rack; 3. Heat-conducting plate; 4. Cooling plate; 401. Chamber; 402. Liquid inlet tee; 4021. First hollow sleeve; 4022. Spiral column; 4023. Hollow plate; 4024. Flow-limiting ball; 403. Liquid outlet tee; 4031. Second hollow sleeve; 404. Heat dissipation hole; 405. Counterweight; 5. First circulation pipeline; 6. Second circulation pipeline; 601. Branch pipe; 602. Solenoid valve; 7. Cooling fan. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Please combine Figures 1 to 10 , a DC cabinet with multi-stage thermal control, comprising: a cabinet body 1, wherein the cabinet body 1 is provided with a main chamber 101 and two side chambers 102, and the two side chambers 102 are both provided with detachable side panels; The main chamber 101 is provided with a plurality of heat-conducting racks 2 and heat-conducting plates 3 for mounting electrical components and conducting heat to the electrical components. The heat-conducting racks 2 and heat-conducting plates 3 are both hollow structures, and coolant can flow through them to achieve water cooling (the style and structure of the heat-conducting racks 2 and heat-conducting plates 3 are not fixed and can be customized according to actual needs so that they can be perfectly attached to the components to achieve heat conduction and cooling). The two side chambers 102 are both rotatably provided with cooling disks 4 for storing coolant. The outer sleeve of the cooling disk 4 is provided with an outer ring, which is fixed to the inner wall of the side chamber 102 by bolts. A first circulation pipeline 5 and a second circulation pipeline 6 are connected between the two cooling disks 4 and the heat-conducting racks 2 and the heat-conducting plates 3 to achieve circulation cooling; Please combine Figure 7The cooling disk 4 is provided with two upper and lower non-connected chambers 401, and the two chambers 401 are respectively a circulation chamber and a spare chamber (the circulation chamber and the spare chamber are not specific chambers 401, the chamber 401 at the top is the spare chamber, and the chamber 401 at the bottom is the circulation chamber, and the two are switched between each other). A liquid inlet tee 402 and a liquid outlet tee 403 are fixedly provided in the cooling disk 4, and the upper and lower ends of the liquid inlet tee 402 and the liquid outlet tee 403 extend into the two chambers 401 respectively. The length of the liquid inlet tee 402 is shorter than the liquid outlet tee 403, so that the inlet and outlet positions of the coolant can be staggered, so that one of the chambers 401 can be used as a spare chamber, and the switching of the coolant circulation in the two chambers 401 is completed by rotating the cooling disk 4, thereby alleviating the cooling burden.

[0020] Through the above technical solution, a cooling disk 4 with a redundant switching function is added to the water-cooled heat dissipation cycle. By dividing the internal space of the cooling disk 4 into two chambers 401, and using the two chambers 401 as a circulation chamber and a standby chamber that can be switched with each other, when the coolant in one chamber 401 is in a heat dissipation cycle, the coolant in the other chamber 401 is in a standby state, so that the coolant in the standby chamber has a longer cooling time, thereby maintaining a non-high temperature state, and the cooling disk 4 is rotated regularly to switch the two chambers 401, thereby achieving cooling buffering and alleviating cooling pressure; By arranging a liquid inlet tee 402 and a liquid outlet tee 403 in the cooling disk 4, and arranging a first hollow sleeve 4021 and a second hollow sleeve 4031 on the ports of the two, the circulation switching of the coolant in the two chambers 401 can be achieved with a simple structure without affecting the normal rotation of the cooling disk 4, thereby greatly reducing the failure rate of the entire cooling disk 4.

[0021] Please combine Figure 4 and Figure 5 The first circulation pipeline 5 is connected in series with multiple heat-conducting plates 3 and is connected to the two cooling disks 4. The second circulation pipeline 6 is connected in series with multiple heat-conducting frames 2 and is connected to the two cooling disks 4. The first circulation pipeline 5 and the second circulation pipeline 6 are both composed of multiple connecting pipes and a delivery pump. The ports of the liquid inlet tee 402 and the liquid outlet tee 403 extending to the outside of the cooling disk 4 are respectively rotatably connected to the corresponding connecting pipes, and multiple solenoid valves 602 are also provided on the connecting pipe of the second circulation pipeline 6, and a branch pipe 601 is provided between it and the multiple heat-conducting frames 2, and a temperature sensor is also provided on the heat-conducting frame 2, so that when the temperature of the components on the heat-conducting frame 2 is too high, the solenoid valve 602 can close the connecting pipe, so that the coolant can flow from the heat-conducting frame 2 through the branch pipe 601 to improve its cooling effect.

[0022] Please combine Figure 8 and Figure 9The upper and lower ends of the liquid inlet tee 402 are both sleeved with a first hollow sleeve 4021 that slides up and down, so as to control the flow path of the coolant and guide the coolant into the chamber 401 below. The upper and lower ends of the liquid outlet tee 403 are both sleeved with a second hollow sleeve 4031 that slides up and down, so as to realize the opening and closing switching of the two ports of the liquid outlet tee 403.

[0023] Please combine Figure 9 A movable flow-limiting ball 4024 and two hollow plates 4023 for limiting the movable range of the flow-limiting ball 4024 are provided in the liquid inlet tee 402, so that when the circulating coolant enters the cooling disk 4 through the liquid inlet tee 402, the flow-limiting ball 4024 limits the flow of the port below the liquid inlet tee 402, thereby realizing the diversion of the coolant and allowing it to flow into the upper and lower chambers 401 respectively, thereby completing the switching of the upper and lower centers of gravity of the cooling disk 4, and realizing the coolant circulation switching through rotation.

[0024] Through the above technical solution, the circulating coolant can enter the upper and lower chambers 401 at the same time through diversion when entering the cooling disk 4, and the center of gravity of the cooling disk 4 can be shifted by utilizing the method of increase and decrease, so that the entire cooling disk 4 can automatically switch between the two chambers 401, which not only simplifies the structure and reduces the cost and energy consumption of the entire water-cooling structure, but also reduces the overall failure rate.

[0025] Please combine Figure 9 Two spiral columns 4022 are slidingly provided in the liquid inlet three-way pipe 402 , and one end of the two spiral columns 4022 is fixedly connected to the two first hollow sleeves 4021 respectively.

[0026] Through the above technical solution, the spiral column 4022 at the upper end of the liquid inlet tee 402 increases the residence time of the coolant in the liquid inlet tee 402, so that it has more cooling time in the liquid inlet tee 402, avoiding thermal shock after mixing with the coolant in the chamber 401 above. The spiral column 4022 at the lower end of the liquid inlet tee 402 allows the coolant to rotate and discharge to better mix with the chamber 401 below, avoiding temperature stratification and affecting the circulation cooling effect of the coolant.

[0027] Please combine Figure 7 and Figure 8 Two upper and lower counterweights 405 are provided on one side of the cooling plate 4. The two counterweights 405 are respectively positioned relative to the upper and lower chambers 401, so that the cooling plate 4 can smoothly rotate 180 degrees when the two chambers 401 are switched up and down, avoiding the cooling plate 4 rotating only 90 degrees, causing the two chambers 401 to change from being distributed up and down to being distributed left and right.

[0028] Please combine Figure 6 and Figure 7 The cooling plate 4 is provided with a plurality of heat dissipation holes 404, and the cabinet 1 is provided with two sets of upper and lower ventilation holes 103 that penetrate the main chamber 101 and the side chamber 102 and are opposite to the two cooling plates 4, so as to improve the heat dissipation effect of the cooling plate 4 and the cabinet 1.

[0029] Please combine Figure 2 and Figure 3 A cooling fan 7 is provided in each of the two side chambers 102 , and the two cooling fans 7 and the two cooling plates 4 are arranged in an offset manner up and down, so as to further improve the heat dissipation effect of the cooling plates 4 and the cabinet 1 by utilizing the cooling fans 7 .

[0030] The implementation principle of a DC cabinet with multi-stage thermal control in the embodiment of the present application is as follows: During deployment, components with low heat generation are mounted and fixed on the heat conducting frame 2, large equipment with high heat generation is mounted on the heat conducting plate 3, and an appropriate amount of coolant is injected into the two chambers 401 of the two cooling plates 4; During operation, the delivery pumps on the first circulation pipeline 5 and the second circulation pipeline 6 are started, so that the coolant in the two cooling disks 4 circulates through the multiple heat-conducting racks 2 and the multiple heat-conducting plates 3. During circulation, the second hollow sleeve 4031 at the top of the liquid outlet tee 403 automatically falls to block the top port of the liquid outlet tee 403. Conversely, the port at the bottom end of the liquid outlet tee 403 is opened. At this time, under the pumping of the delivery pump, the coolant in the lower chamber 401 is continuously pumped away through the liquid outlet tee 403. At the same time, the circulating coolant enters the liquid inlet tee 402, and due to the influence of the flow restriction ball 4024, the delivered coolant cannot all enter the lower chamber 401, and is diverted into the upper chamber 401. As a result, the coolant in the lower chamber 401 becomes less and less, while the coolant in the upper chamber 401 becomes more and more, until the center of gravity of the two is reversed, causing the entire cooling plate 4 to rotate 180 degrees up and down, so that the coolant that was originally in standby state can be added to the circulation, thereby reducing the cooling burden of the coolant.

[0031] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A DC cabinet with multi-stage thermal control, characterized in that: include: A cabinet (1), wherein the cabinet (1) is provided with a main chamber (101) and two side chambers (102); The main chamber (101) is provided with a plurality of heat-conducting racks (2) and heat-conducting plates (3) for mounting electrical components and conducting heat to the electrical components. The two side chambers (102) are both provided with rotatable cooling disks (4) for storing cooling liquid. A first circulation pipeline (5) and a second circulation pipeline (6) are connected between the two cooling disks (4) and the heat-conducting racks (2) and the heat-conducting plates (3), thereby achieving cyclic cooling. Two upper and lower non-communicating chambers (401) are provided in the cooling plate (4), a liquid inlet tee (402) and a liquid outlet tee (403) are fixedly provided in the cooling plate (4), and upper and lower ends of the liquid inlet tee (402) and the liquid outlet tee (403) respectively extend into the two chambers (401); In this way, one of the chambers (401) is used as a spare chamber, and the switching of the coolant circulation in the two chambers (401) is completed by rotating the cooling disk (4), thereby alleviating the cooling burden.

2. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: The first circulation pipeline (5) is connected in series with a plurality of heat-conducting plates (3) and is in communication with two cooling disks (4); the second circulation pipeline (6) is connected in series with a plurality of heat-conducting racks (2) and is in communication with two cooling disks (4).

3. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: The upper and lower ends of the liquid inlet three-way pipe (402) are both provided with a first hollow sleeve (4021) that slides up and down, thereby controlling the flow path of the coolant and guiding the coolant into the chamber (401) below.

4. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: The upper and lower ends of the liquid outlet three-way pipe (403) are both sleeved with a second hollow sleeve (4031) that slides up and down, thereby realizing the opening and closing switching of the two ports of the liquid outlet three-way pipe (403).

5. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: The liquid inlet tee (402) is provided with a movable flow-limiting ball (4024) and two hollow plates (4023) for limiting the range of movement of the flow-limiting ball (4024), so that when the circulating coolant enters the cooling plate (4) through the liquid inlet tee (402), the flow-limiting ball (4024) limits the flow of the port below the liquid inlet tee (402), thereby realizing the diversion of the coolant and allowing it to flow into the upper and lower chambers (401) respectively, thereby completing the switching of the upper and lower centers of gravity of the cooling plate (4), and realizing the switching of the coolant circulation through rotation.

6. The DC cabinet with multi-stage thermal control according to claim 3, characterized in that: Two spiral columns (4022) are slidingly arranged in the liquid inlet tee (402), and one end of the two spiral columns (4022) is fixedly connected to the two first hollow sleeves (4021) respectively, so that the spiral column (4022) at the upper end of the liquid inlet tee (402) increases the residence time of the coolant in the liquid inlet tee (402), so that it has more cooling time in the liquid inlet tee (402), avoiding thermal shock after mixing with the coolant in the chamber (401) above, while the spiral column (4022) at the lower end of the liquid inlet tee (402) allows the coolant to rotate and be discharged to better mix with the chamber (401) below, avoiding temperature stratification.

7. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: One side of the cooling plate (4) is provided with two upper and lower counterweight blocks (405), and the two counterweight blocks (405) are respectively positioned relative to the upper and lower chambers (401), so that the cooling plate (4) can smoothly rotate 180 degrees when the two chambers (401) are switched up and down, thereby avoiding the cooling plate (4) rotating only 90 degrees, which causes the two chambers (401) to change from being distributed up and down to being distributed left and right.

8. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: The cooling plate (4) is provided with a plurality of heat dissipation holes (404), and the cabinet (1) is provided with two upper and lower groups of ventilation holes (103) that penetrate the main chamber (101) and the side chamber (102) and are positioned opposite to the two cooling plates (4).

9. The DC cabinet with multi-stage thermal control according to claim 1, characterized in that: A cooling fan (7) is provided in each of the two side chambers (102), and the two cooling fans (7) and the two cooling plates (4) are arranged in an offset and aligned manner up and down.

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