A heat exchanger and a charger cabinet and a charger using the heat exchanger

Abstract

The present invention discloses a heat exchanger and a charger cabinet and a charger using the heat exchanger. The heat exchanger comprises a shell, in which a first heat exchanger, a second heat exchanger and a cold channel between the two are arranged, a first fan is arranged in the cold channel, a hot channel is arranged on the top of the first heat exchanger and the second heat exchanger, a second fan is arranged in the hot channel, a cold channel inlet and a hot channel outlet are arranged on the first heat exchanger, and a cold channel outlet and a hot channel inlet are arranged on the second heat exchanger. The heat exchanger disclosed by the present invention has low noise, small size, high fan protection level, long service life and high heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a heat exchanger and a charger cabinet and a charger using the heat exchanger. Background Art

[0002] As an important supporting facility for new energy vehicles, the distribution and quantity of electric vehicle chargers directly affect the promotion of new energy vehicles. At present, traditional electric vehicle chargers use a direct ventilation heat dissipation structure. Although it has a high heat dissipation efficiency, it cannot operate reliably and stably in harsh environments such as coasts and mining areas due to lack of protection. Such environments require the use of heat exchange high-protection chargers.

[0003] The main task of electric vehicle chargers is to convert the AC power in the power grid into the DC power required by electric vehicles. The conversion process cannot achieve 100% efficiency, and the energy lost is mostly dissipated in the form of heat. The core component of the charger, the AC / DC power module, is manufactured using power electronics technology. The internal components are very sensitive to heat and have high requirements for the heat dissipation system. Existing heat exchange devices often have problems such as low heat exchange power, large size, high noise, and poor protection, and cannot be fully promoted and applied. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a heat exchanger and a charger cabinet and a charger using the heat exchanger, so that the heat exchanger can meet the heat dissipation requirements of the electric vehicle charger, and provide a highly protected, reliable, low-noise and economical heat dissipation solution for chargers in coastal areas, mining areas and other areas.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A heat exchanger comprises a shell, wherein a first heat exchanger, a second heat exchanger and a cold channel between the two are arranged in the shell, a first fan is arranged in the cold channel, a hot channel is arranged on the top of the first heat exchanger and the second heat exchanger, a second fan is arranged in the hot channel, a cold channel inlet and a hot channel outlet are arranged on the first heat exchanger, and a cold channel outlet and a hot channel inlet are arranged on the second heat exchanger.

[0007] In the above scheme, cold sub-channels and hot sub-channels are arranged in the first heat exchanger and the second heat exchanger, the cold sub-channels are connected to the cold channel, and the hot sub-channels are connected to the hot channel. The cold sub-channel of the first heat exchanger is connected to the inlet of the cold channel, and the hot sub-channel of the first heat exchanger is connected to the outlet of the hot channel; the cold sub-channel of the second heat exchanger is connected to the outlet of the cold channel, and the hot sub-channel of the second heat exchanger is connected to the inlet of the hot channel.

[0008] In the above solution, at least one cold sub-channel and one hot sub-channel are respectively provided in the first heat exchanger and the second heat exchanger, and the cold sub-channel and the hot sub-channel are arranged in parallel longitudinally along the thickness direction of the shell.

[0009] In the above solution, the first fan is an axial flow fan or a mixed flow fan, and the second fan is a centrifugal fan or a mixed flow fan.

[0010] In the above solution, corrugated fins are arranged in both the cold sub-channel and the hot sub-channel.

[0011] In the above solution, the cold channel inlet is arranged on the side of the shell, and the hot channel outlet is arranged on the bottom of the shell; the cold channel outlet is arranged on the side of the shell, and the hot channel inlet is arranged on the bottom of the shell.

[0012] In the above solution, an inclined air guide plate is arranged above the first heat exchanger in the heat channel.

[0013] A charger cabinet, wherein the heat exchanger according to claim 1 is arranged on the top of the cabinet, the cold channel inlet and the cold channel outlet are respectively connected to the outside air, and the hot channel outlet and the hot channel inlet are respectively connected to the inside of the cabinet.

[0014] A charger comprises a cabinet, a charging power supply is arranged in the cabinet, a heat exchanger as claimed in claim 1 is arranged on the top of the cabinet, the cold channel inlet and the cold channel outlet are respectively connected to the outside air, and the hot channel outlet and the hot channel inlet are respectively connected to the area where the charging power supply is located inside the cabinet.

[0015] Through the above technical scheme, the heat exchanger provided by the present invention is provided with a first fan in the middle of the two groups of heat exchangers. The first fan uses suction to draw the external cold air flow into the cold channel inlet of the first heat exchanger, and then presses the air flow into the cold sub-channel of the second heat exchanger by pressure and flows to the outside. A second fan is provided in the middle of the hot channels of the two groups of heat exchangers. The second fan uses suction to draw the hot air flow in the cabinet through the hot channel inlet, and then presses the air flow into the hot sub-channel of the first heat exchanger by pressure. After sufficient heat exchange with the cold air flow, it flows into the cabinet to cool down the charging power supply in the cabinet. The present invention has the following beneficial effects:

[0016] 1. The first fan and the second fan of the present invention are both placed in the middle area of ​​the two sets of heat exchangers. The airflows that the fans are exposed to are warm and cold airflows, which prevents the fans from directly contacting high-temperature or low-temperature gases, and is beneficial to improving the operating environment of the fans and thus prolonging the life of the fans.

[0017] 2. The first fan is placed in the middle area of ​​the two sets of heat exchangers. Rainwater in the outside air is blocked by the heat exchanger and has almost no effect on the fan, which indirectly improves the protection level of the fan;

[0018] 3. The fan is placed in the middle area of ​​the two sets of heat exchangers. The aerodynamic and mechanical noise generated by the fan is blocked by the heat exchanger, which reduces the amount of fan noise emission, thereby achieving noise reduction of the heat exchanger;

[0019] 4. The fan and heat exchanger are cleverly embedded and integrated to reduce the overall volume of the heat exchanger;

[0020] 5. The heat exchanger makes full use of the ventilation characteristics of centrifugal, axial flow and mixed flow fans to avoid unnecessary pressure loss caused by sudden changes in air flow direction and improve the working efficiency of the heat exchanger;

[0021] 6. The heat exchanger adopts a two-stage heat exchange structure consisting of a first heat exchanger and a second heat exchanger and a first fan and a second fan, which helps to improve the heat exchange effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0023] Figure 1 A front cross-sectional view of a heat exchanger disclosed in an embodiment of the present invention;

[0024] Figure 2 It is a left view of the first heat exchanger disclosed in the embodiment of the present invention;

[0025] Figure 3 The figure is a front cross-sectional view of a charger using the heat exchanger disclosed in an embodiment of the present invention.

[0026] In the figure, 1, shell; 2, first heat exchanger; 3, second heat exchanger; 4, cold channel; 5, first fan; 6, hot channel; 7, second fan; 8, cold sub-channel; 9, hot sub-channel; 10, cold channel inlet; 11, hot channel outlet; 12, cold channel outlet; 13, hot channel inlet; 14, cabinet; 15, charging power supply; 16, air guide baffle; 17, air guide plate; 18, fin. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] The present invention provides a heat exchanger and a charger cabinet and a charger using the heat exchanger. The heat exchanger solves the problems of existing heat exchangers in terms of heat exchange power, protection, noise, volume, heat exchange efficiency, etc., so that the heat exchanger can meet the heat dissipation requirements of electric vehicle chargers, and bring a highly protected, reliable and economical heat dissipation solution for chargers in coastal areas, mining areas and other regions.

[0029] like Figure 1 and Figure 2 The heat exchanger shown includes a shell 1, in which a first heat exchanger 2 and a second heat exchanger 3 are arranged, and a cold channel 4 is located between the two. A first fan 5 is arranged in the cold channel 4, a hot channel 6 is arranged on the top of the first heat exchanger 2 and the second heat exchanger 3, and a second fan 7 is arranged in the hot channel 6. Cold sub-channels 8 and hot sub-channels 9 are arranged in the first heat exchanger 2 and the second heat exchanger 3 at intervals. The cold sub-channel 8 is connected to the cold channel 4, and the hot sub-channel 9 is connected to the hot channel 6. A cold channel inlet 10 is arranged on the cold sub-channel 8 of the first heat exchanger 2, and a hot channel outlet 11 is arranged on the hot sub-channel 9; a cold channel outlet 12 is arranged on the cold sub-channel 8 of the second heat exchanger 3, and a hot channel inlet 13 is arranged on the hot sub-channel 9. The cold channel inlet 10 is arranged on the side of the shell 1, and the hot channel outlet 11 is arranged on the bottom of the shell 1; the cold channel outlet 12 is arranged on the side of the shell 1, and the hot channel inlet 13 is arranged on the bottom of the shell 1. An inclined air guide plate 17 is provided above the first heat exchanger 2 in the hot channel 6 .

[0030] In this embodiment, the first fan 5 is an axial flow fan or a mixed flow fan, and the second fan 7 is a centrifugal fan or a mixed flow fan, which avoids unnecessary pressure loss caused by sudden changes in air flow direction and helps to improve the working efficiency of the heat exchanger.

[0031] The air intake of the first fan 5 faces the cold channel inlet 10 of the first heat exchanger 2, and the air outlet of the first fan 5 faces the inside of the cold channel 4, that is, the cold channel outlet 12 of the second heat exchanger 3. The air intake of the second fan 7 faces the hot channel inlet 13 of the second heat exchanger 3, and the air outlet of the second fan 7 faces the inside of the hot channel 6, that is, the hot channel outlet 11 of the first heat exchanger 2.

[0032] like Figure 2 As shown, the cold sub-channel 8 and the hot sub-channel 9 are both provided with corrugated fins 18. At least one cold sub-channel 8 and one hot sub-channel 9 are respectively provided in the first heat exchanger 2 and the second heat exchanger 3, and the cold sub-channel and the hot sub-channel are arranged side by side longitudinally along the thickness direction of the shell. The corrugated fin structure is relatively cheap and easy to purchase, which not only greatly reduces the cost compared with the heat pipe type, but also has no refrigerant inside, avoiding leakage problems and improving the reliability of the heat exchanger.

[0033] like Figure 3 As shown, a charger cabinet is provided with the above-mentioned heat exchanger on the top of the cabinet, the cold channel inlet 10 and the cold channel outlet 12 are respectively connected to the outside air, and the hot channel outlet 11 and the hot channel inlet 13 are respectively connected to the inside of the cabinet.

[0034] A charger includes a cabinet, a charging power source 15 is arranged in the cabinet 14, the above-mentioned heat exchanger is arranged on the top of the cabinet 14, the cold channel inlet 10 and the cold channel outlet 12 are respectively connected to the outside air, and the hot channel outlet 11 and the hot channel inlet 13 are respectively connected to the area where the charging power source 15 is located inside the cabinet. In the cabinet 14, an air guide baffle 16 is arranged between the hot channel outlet 11 and the charging power source 15, which is isolated from the rest of the cabinet 14, and is used to introduce the cooled air into the area where the charging power source 15 is located.

[0035] Here’s how it works:

[0036] When the heat exchanger is working, the first fan 5 works to draw the right side of the fan into a negative pressure state. Due to the pressure difference, the external cold air enters the many cold sub-channels 8 in the first heat exchanger 2 from the cold channel inlet 10 from the outside, and then flows into the cold channel 4 of the heat exchanger. The warm cold air heated by the first heat exchanger 2 flows through the first fan 5 and is pressed into the second heat exchanger 3 under the action of the fan. After passing through the many cold sub-channels 8 of the second heat exchanger 3, it flows out to the external environment from the cold channel outlet 12.

[0037] Under the action of the second fan 7, the hot air generated by the charging power source 15 enters the multiple heat sub-channels 9 of the second heat exchanger 3 through the hot channel inlet 13, and then flows into the hot channel 6 of the heat exchanger. During the hot air inflow process, it exchanges heat with the cold air in the second heat exchanger 3 and becomes warm air. Under the action of the second fan 7, it enters the multiple heat sub-channels 9 of the first heat exchanger 2. After being cooled again by the first heat exchanger 2, the warm air becomes warm cold air. An air guide plate 17 is set in the hot channel 6 to facilitate the smooth flow of air into the first heat exchanger 2.

[0038] After the warm and cold air flows out of the heat exchanger from the hot channel outlet 11, it passes through the air guide baffle 16 and flows into the air inlet area in front of the charging power supply 15 of the charger. The airflow passes through the charging power supply 15 to take out the heat generated by the charging power supply 15 and turns into hot air that flows out to the air outlet area of ​​the charging power supply. Under the action of the second fan 7, the hot air enters the heat exchanger through the hot channel inlet 13 and then performs the next heat exchange cycle.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat exchanger, characterized in that: The invention comprises a shell, wherein a first heat exchanger, a second heat exchanger and a cold channel between the first and second heat exchangers are arranged in the shell, a first fan is arranged in the cold channel, a hot channel is arranged on the top of the first and second heat exchangers, a second fan is arranged in the hot channel, a cold channel inlet and a hot channel outlet are arranged on the first heat exchanger, a cold channel outlet and a hot channel inlet are arranged on the second heat exchanger, the second fan is located between the first heat exchanger and the second heat exchanger, and the second fan is configured to send warm air discharged from the second heat exchanger to the first heat exchanger along the hot channel; The first heat exchanger and the second heat exchanger are both provided with cold sub-channels and hot sub-channels at intervals, the cold sub-channel is connected to the cold channel, and the hot sub-channel is connected to the hot channel, the cold sub-channel of the first heat exchanger is connected to the inlet of the cold channel, and the hot sub-channel of the first heat exchanger is connected to the outlet of the hot channel; the cold sub-channel of the second heat exchanger is connected to the outlet of the cold channel, and the hot sub-channel of the second heat exchanger is connected to the inlet of the hot channel; under the action of the second fan, the hot air enters the hot sub-channel of the second heat exchanger and the hot channel of the heat exchanger in turn from the inlet of the hot channel, exchanges heat with the cold air in the second heat exchanger to become warm air, and enters the hot sub-channel of the first heat exchanger under the action of the second fan, and is cooled again by the first heat exchanger to become warm air, and an inclined air guide plate is arranged above the first heat exchanger in the hot channel.

2. The heat exchanger according to claim 1, characterized in that: At least one cold sub-channel and one hot sub-channel are respectively arranged in the first heat exchanger and the second heat exchanger, and the cold sub-channel and the hot sub-channel are arranged in parallel longitudinally along the thickness direction of the shell.

3. The heat exchanger according to claim 1, characterized in that: The first fan is an axial flow fan or a mixed flow fan, and the second fan is a centrifugal fan or a mixed flow fan.

4. The heat exchanger according to claim 2, characterized in that: Corrugated fins are arranged in both the cold sub-channel and the hot sub-channel.

5. The heat exchanger according to claim 1, characterized in that: The cold channel inlet is arranged on the side of the shell, and the hot channel outlet is arranged on the bottom of the shell; the cold channel outlet is arranged on the side of the shell, and the hot channel inlet is arranged on the bottom of the shell.

6. A charger cabinet, characterized in that: A heat exchanger as described in any one of claims 1 to 5 is arranged on the top of the cabinet, the cold channel inlet and the cold channel outlet are respectively connected to the outside air, and the hot channel outlet and the hot channel inlet are respectively connected to the inside of the cabinet.

7. A charger, comprising a cabinet, wherein a charging power source is arranged in the cabinet, characterized in that: A heat exchanger as described in any one of claims 1 to 5 is arranged on the top of the cabinet, the cold channel inlet and the cold channel outlet are respectively connected to the outside air, and the hot channel outlet and the hot channel inlet are respectively connected to the area where the charging power supply is located inside the cabinet.

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