Heat exchange system and electric vehicle charging pile
By introducing a heat exchange system with first and second heat exchange units into the electric vehicle charging station, combined with refrigerant piping and control unit, the contradiction between the number of fans, noise, and heat dissipation efficiency in fan-based heat dissipation methods is resolved, achieving a more efficient, low-noise, and low-cost heat dissipation effect, and enhancing the equipment's sealing performance.
Patent Information
- Application Number
- CN202411568757.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-01-10
AI Technical Summary
The existing fan cooling method of electric vehicle charging piles has a contradiction between the number of fans and noise and heat dissipation efficiency, and it is easy for dust, corrosive gases and moisture to enter, affecting the life of the equipment and causing noise pollution.
A heat exchange system combining first and second heat exchange units with refrigerant piping and control units is installed on the charging pile cabinet side and in the soil, respectively. The circulation of refrigerant is controlled by a control valve to achieve heat exchange between the cabinet and the soil, reducing the number of fans and selecting the heat dissipation method according to the ambient temperature.
It improves heat dissipation efficiency, reduces noise, lowers costs, and enhances equipment sealing to prevent dust and corrosive gases from entering, achieving a balance between cost, noise, and heat dissipation efficiency.
Smart Images
Figure CN119283673A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of charging piles for electric vehicles, and in particular to a heat exchange system and an electric vehicle charging pile. Background Art
[0002] In recent years, with the rapid increase of electric vehicles, the number of charging piles (stations) for charging electric vehicles has also increased rapidly. Compared with other equipment, the heat dissipation of charging piles is much larger, especially DC charging piles, whose power ranges from tens of kilowatts to hundreds of kilowatts, and the efficiency is generally around 95%, so 5% of it is converted into heat loss, that is, the heat loss is also several kilowatts to more than ten kilowatts, so the design requirements of the heat dissipation system are extremely strict.
[0003] At present, the heat dissipation methods of electric vehicle charging piles mainly include fan heat dissipation and air conditioning refrigeration heat dissipation. Air conditioning refrigeration heat dissipation has good heat dissipation effect, but high cost and relatively large power consumption; fan heat dissipation has the advantages of low cost, simple installation and low energy consumption, and is currently the widely used heat dissipation method for charging piles. The existing fan heat dissipation method generally designs the air inlet and outlet of the box as a shutter type, and then installs a fan at the air outlet to extract the exhausted heat. Although this method can play a certain heat dissipation and protection role, it is inevitable that dust, corrosive gases and moisture will enter over time, polluting precision components and bringing too much workload to the subsequent after-sales service; and multiple fans need to be set up. As charging piles are more and more popular in community environments, people have higher and higher requirements for charging pile noise, and more fans will create greater noise; but if the number of fans is small, the heat accumulated in the cabinet cannot be dissipated in a timely and effective manner, and there are problems of low heat exchange efficiency and limited heat dissipation effect.
[0004] In summary, how to achieve a certain balance among cost, noise generated and heat dissipation efficiency is a technical difficulty that needs to be solved urgently in this field. Summary of the invention
[0005] The purpose of the present invention is to provide a novel heat exchange system and an electric vehicle charging pile having the system, which can achieve a balance in cost, noise, heat dissipation efficiency and sealing, and solve the technical problems in the existing fan heat dissipation method that the number of fans set is inconsistent with the noise and heat dissipation efficiency and is not conducive to after-sales work.
[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A heat exchange system, comprising: A first heat exchange unit is installed on one side of the cabinet of the charging pile; a second heat exchange unit, pre-buried in the soil below the cabinet; A refrigerant pipeline and a control valve, wherein the refrigerant pipeline is used to connect the first heat exchange unit and the second heat exchange unit to form a circulation pipeline, and the control valve is arranged on the circulation pipeline; A control unit is connected to the control valve signal and is used to control the opening and closing of the circulation pipeline to control the first heat exchange unit to work alone or simultaneously with the second heat exchange unit.
[0007] In some embodiments, the heat exchange system also includes a temperature acquisition unit, which includes a first temperature sensor, a second temperature sensor and a third temperature sensor, wherein the first temperature sensor is used to collect the external ambient temperature of the cabinet, the second temperature sensor is used to collect the internal temperature of the cabinet, and the third temperature sensor is used to collect the soil temperature in which the second heat exchange unit is embedded, and the first temperature sensor, the second temperature sensor and the third temperature sensor are respectively connected to the control unit signal.
[0008] In some embodiments, the first heat exchange unit includes a first chamber, a second chamber and a circulation pipeline, the first chamber is located inside the cabinet, the second chamber is located outside the cabinet, the first chamber and the second chamber can perform heat exchange but are not connected to each other, the circulation pipeline is arranged inside the first chamber and the second chamber, and both ends of the circulation pipeline are connected to the refrigerant pipeline through the control valve; The first chamber is formed with a first inlet and a first outlet, and the second chamber is formed with a second inlet and a second outlet.
[0009] In some embodiments, the first heat exchange unit further includes a metal partition, and the metal partition is used to divide the first heat exchange unit into the first chamber and the second chamber.
[0010] In some embodiments, the first heat exchange unit further includes two fans, and the two fans are respectively disposed at the first outlet and the second outlet.
[0011] In some embodiments, the second heat exchange unit includes a conduit, which is U-shaped and arranged in the soil below the cabinet. The conduit is formed with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively connected to the refrigerant pipeline.
[0012] In some embodiments, the lower section of the conduit is disposed in a water permeable layer of the soil.
[0013] In some embodiments, there are multiple conduits, and multiple second conduits are arranged in parallel on the refrigerant pipeline.
[0014] In some embodiments, the control valve includes a three-way valve A and a three-way valve B, and the three interfaces of the three-way valve A and the three-way valve B are respectively connected to the two ends of the circulation pipeline and the refrigerant pipeline, and the three-way valve A and the three-way valve B are respectively connected to the control unit signal.
[0015] On the other hand, the present invention further provides an electric vehicle charging pile, which includes the heat exchange system provided by the present invention.
[0016] Compared with the prior art, the present invention provides a heat exchange system and an electric vehicle charging pile, which are provided with a first heat exchange unit and a second heat exchange unit to dissipate heat from the cabinet of the charging pile, fully ensuring the heat dissipation effect, improving the heat dissipation efficiency, and eliminating the need to use multiple fans, thereby generating less noise. At the same time, the present invention also controls the control valve through a control unit, and can select a suitable heat dissipation method according to the current environment by making the first heat exchange unit and the second heat exchange unit work separately or simultaneously, so as to enable the system to reach the optimal state. Therefore, the present invention achieves a balance in terms of cost, noise and heat dissipation efficiency, and solves the technical problem that the number of fans set in the existing fan heat dissipation method is inconsistent with the noise and heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is the overall framework diagram of the heat exchange system of the present invention; Figure 2 is a framework diagram of the first heat exchange unit of the present invention; Figure 3 is a framework diagram of the second heat exchange unit of the present invention; Figure 4 is a refrigerant flow circuit diagram of the heat exchange system of the present invention; Figure 5 It is a control flow chart of the heat exchange system of the present invention.
[0018] The following are the descriptions of the reference numerals: 100, a first heat exchange unit, 110, a first chamber, 111, a first inlet, 112, a first outlet, 120, a second chamber, 121, a second inlet, 122, a second outlet, 130, a fan, 140, a circulation pipeline; 200, a second heat exchange unit, 210, a conduit, 211, a refrigerant inlet, 212, a refrigerant outlet; 300. Refrigerant pipeline; 400, control valve, 410, three-way valve A, 420, three-way valve B; 500. control unit; 600. Cabinet. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0020] In view of the technical problem that the number of fans set in the existing fan heat dissipation method for electric vehicle charging piles is inconsistent with the noise and heat dissipation efficiency, the present invention provides a heat exchange system and an electric vehicle charging pile with the system, which can achieve a balance in terms of cost, noise, heat dissipation efficiency and sealing.
[0021] See also Figure 1 As shown, Figure 1 This is a general framework diagram of a heat exchange system provided by the present invention, wherein the heat exchange system includes a first heat exchange unit 100, a second heat exchange unit 200, a refrigerant pipeline 300, a control valve 400 and a control unit 500. The first heat exchange unit 100 is installed on one side of a cabinet 600 of a charging pile, and the second heat exchange unit 200 is pre-buried in the soil below the cabinet 600. The refrigerant pipeline 300 is used to connect the first heat exchange unit 100 and the second heat exchange unit 200 to form a circulation pipeline. The control valve 400 is arranged on the circulation pipeline. The control unit 500 is connected to the control valve 400 by signal, and is used to control the opening and closing of the circulation pipeline to control the first heat exchange unit 100 to work alone or simultaneously with the second heat exchange unit.
[0022] The present invention can fully cool and dissipate the heat in the cabinet 600 by disposing a first heat exchange unit 100 on one side of the cabinet 600 of the charging pile and a second heat exchange unit 200 in the soil below the cabinet 600, thereby ensuring the heat dissipation effect of the charging pile and improving the heat dissipation efficiency; on this basis, the present invention can ensure the heat dissipation effect without using a large number of fans, thereby greatly reducing noise, which is conducive to the popularization of charging piles in the community.
[0023] At the same time, the present invention also controls the control valve 400 through the control unit 500, and can choose to use the first heat exchange unit 100 alone for heat dissipation or use the first heat exchange unit 100 and the second heat exchange unit 200 for heat dissipation at the same time according to the current environment, so that the heat dissipation of the charging pile is more reasonable and the heat dissipation efficiency is higher, and the system can reach the optimal state. Therefore, the present invention achieves a balance in terms of cost, noise and heat dissipation efficiency, and solves the technical problem that the number of fans set in the existing fan heat dissipation method is inconsistent with the noise and heat dissipation efficiency.
[0024] It should be noted that the design intention of the present invention is that if the temperature of the soil where the second heat exchange unit 200 is located is the lowest, the first heat exchange unit 100 and the second heat exchange unit 200 work simultaneously; if the temperature of the soil is higher than the temperature of the cabinet 600 or the external ambient temperature, only the first heat exchange unit 100 is used for heat dissipation.
[0025] In one embodiment, the heat exchange system also includes a temperature acquisition unit, which includes a first temperature sensor, a second temperature sensor and a third temperature sensor, wherein the first temperature sensor is used to collect the external ambient temperature of the cabinet 600, the second temperature sensor is used to collect the internal temperature of the cabinet 600, and the third temperature sensor is used to collect the soil temperature in which the second heat exchange unit 200 is embedded, and the first temperature sensor, the second temperature sensor and the third temperature sensor are respectively connected to the control unit 500 by signal.
[0026] In the above technical solution, the first temperature sensor, the second temperature sensor and the third temperature sensor are respectively used to monitor the external ambient temperature of the cabinet 600, the internal ambient temperature of the cabinet 600 and the soil temperature in which the second heat exchange unit 200 is embedded. Since the charging pile is generally turned on for a long time, the external ambient temperature is ≤ the internal ambient temperature by default. Under this condition, we set: 1. When the detected soil temperature is ≤ the external environment temperature ≤ the internal environment temperature, that is, when the soil temperature is the lowest, the control valve 400 is regulated by the control unit 500 so that the refrigerant medium circulates in the first heat exchange unit 100 and the second heat exchange unit 200. At this time, the first heat exchange unit 100 and the second heat exchange unit 200 work simultaneously to dissipate heat for the charging pile; 2. When the detected external ambient temperature is ≤ soil temperature ≤ internal ambient temperature, or when the external ambient temperature is ≤ internal ambient temperature ≤ soil temperature, the control valve 400 is regulated by the control unit 500 so that the refrigerant medium circulates only inside the first heat exchange unit 100 to dissipate heat.
[0027] It should be noted that, in the above two cases, the fan 130 is always in the on state.
[0028] In one embodiment, if Figure 2As shown, the first heat exchange unit 100 includes a first chamber 110, a second chamber 120 and a circulation pipeline 140. The first chamber 110 is located inside the cabinet 600, and the second chamber 120 is located outside the cabinet 600. The first chamber 110 and the second chamber 120 can perform heat exchange but are not connected to each other. The circulation pipeline 140 is arranged inside the first chamber 110 and the second chamber 120, and both ends of the circulation pipeline 140 are connected to the refrigerant pipeline 300 through the control valve 400; the first chamber 110 is formed with a first inlet 111 and a first outlet 112, and the second chamber 120 is formed with a second inlet 121 and a second outlet 122.
[0029] In one embodiment, the first chamber 110 and the second chamber 120 are two independent spaces separated by a metal partition, and the air between the two does not circulate, and heat exchange is performed through the metal partition in the middle. Therefore, the present invention can prevent external dust, corrosive gases and moisture from entering the cabinet 600, effectively avoiding the risk of components inside the cabinet 600 being corroded, thereby greatly reducing after-sales work.
[0030] In one embodiment, the first heat exchange unit 100 further includes two fans 130 , and the two fans 130 are respectively disposed at the first outlet 112 and the second outlet 122 .
[0031] In the above technical solution, the working principle of the first heat exchange unit 100 is as follows: The hot air generated by the cabinet 600 enters the first chamber 110 through the first inlet 111, and performs heat exchange with the refrigerant flowing in the circulation pipe 140. At the same time, the external air enters the second chamber 120 through the second inlet 121, and performs heat exchange with the first chamber 110 directly through the metal partition or first performs heat exchange with the refrigerant in the circulation pipe 140 and then performs heat exchange with the first chamber 110. The cold air formed by the hot air in the first chamber 110 under the action of multiple heat exchanges returns to the inside of the cabinet 600 through the first outlet 112 under the action of the fan 130, and the hot air is discharged to the external environment through the second outlet 122 under the action of the fan 130, completing the heat exchange process. This is a working mode in which heat is dissipated only through the first heat exchange unit 100.
[0032] In one embodiment, if Figure 3 As shown, the second heat exchange unit 200 includes a conduit 210, which is U-shaped and arranged in the soil below the cabinet 600. The conduit 210 is formed with a refrigerant inlet 211 and a refrigerant outlet 212, and the refrigerant inlet 211 and the refrigerant outlet 212 are respectively connected to the refrigerant pipeline 300.
[0033] In one embodiment, the lower section of the conduit 210 is disposed in the permeable layer of the soil.
[0034] In one embodiment, in order to enhance the heat dissipation effect, the number of the conduits 210 is multiple, and the multiple conduits 210 are arranged in parallel on the refrigerant pipeline 300 .
[0035] In one embodiment, the control valve 400 includes a three-way valve A410 and a three-way valve B420, and the three interfaces of the three-way valve A410 and the three-way valve B420 are respectively connected to the two ends of the circulation pipeline 140 and the refrigerant pipeline 300, and the three-way valve A410 and the three-way valve B420 are respectively connected to the control unit 500 signal.
[0036] The working principle of the heat exchange system of the present invention is as follows: See also Figure 4 and Figure 5 As shown, the three interfaces of the three-way valve A410 are A1, A2 and A3 respectively, and the three interfaces of the three-way valve B420 are B1, B2 and B3 respectively. When the soil temperature is the lowest, the control unit 500 controls the interfaces A1 and A2 to be connected, and A3 to be disconnected, and the interfaces B1 and B2 to be connected, and B3 to be disconnected. At this time, a pipeline is formed for the refrigerant medium to flow in the first chamber 110 and the second heat exchange unit 200, and the heat is dissipated inside the cabinet 600 by the simultaneous action of the pipeline and the fan 130; When the temperature of the soil is higher than the temperature of the cabinet 600 or is between the temperature of the cabinet 600 and the external ambient temperature, the control unit 500 controls interfaces A2 and A3 to be connected and A1 to be disconnected, and interfaces B1 and B3 to be connected and B2 to be disconnected. At this time, a circulation pipeline 140 is formed in which the cold medium flows in the first chamber 110 and the second chamber 120, and the interior of the cabinet 600 is cooled by the simultaneous action of the circulation pipeline 140 and the fan 130.
[0037] It can be seen that the heat exchange system provided by the present invention has achieved a balance in heat dissipation efficiency, noise, cost and sealing compared with the existing fan cooling and air conditioning cooling methods, as shown in the following table:
[0038] It can be seen from the above table that the heat exchange system provided by the present invention has achieved a certain balance in terms of cost, efficiency and noise.
[0039] On the other hand, the present invention provides an electric vehicle charging pile, which includes the heat exchange system provided by the above technical solution of the present invention.
[0040] In summary, the heat exchange system and the electric vehicle charging pile with the system provided by the present invention can make judgments based on the temperature of the current environment and select a suitable heat exchange method to optimize the heat dissipation efficiency of the system; and the number of fans used in the present invention is much less than that of a simple fan heat dissipation method, so the noise of the entire system is less than that of a simple fan heat dissipation method; in addition, the structure of the present invention is simple and reliable, the cost is low, and the life is long.
[0041] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.
Claims
1. A heat exchange system, characterized in that: include: A first heat exchange unit is installed on one side of the cabinet of the charging pile; a second heat exchange unit, pre-buried in the soil below the cabinet; A refrigerant pipeline and a control valve, wherein the refrigerant pipeline is used to connect the first heat exchange unit and the second heat exchange unit to form a circulation pipeline, and the control valve is arranged on the circulation pipeline; A control unit is connected to the control valve signal and is used to control the opening and closing of the circulation pipeline to control the first heat exchange unit to work alone or simultaneously with the second heat exchange unit.
2. The heat exchange system according to claim 1, characterized in that: It also includes a temperature acquisition unit, which includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The first temperature sensor is used to collect the external environment temperature of the cabinet, the second temperature sensor is used to collect the internal temperature of the cabinet, and the third temperature sensor is used to collect the soil temperature in which the second heat exchange unit is embedded. The first temperature sensor, the second temperature sensor and the third temperature sensor are respectively connected to the control unit by signal.
3. The heat exchange system according to claim 2, characterized in that: The first heat exchange unit includes a first chamber, a second chamber and a circulation pipeline, the first chamber is located inside the cabinet, the second chamber is located outside the cabinet, the first chamber and the second chamber can perform heat exchange but are not connected to each other, the circulation pipeline is arranged inside the first chamber and the second chamber, and both ends of the circulation pipeline are connected to the refrigerant pipeline through the control valve; The first chamber is formed with a first inlet and a first outlet, and the second chamber is formed with a second inlet and a second outlet.
4. The heat exchange system according to claim 3, characterized in that: The first heat exchange unit further includes a metal partition plate for dividing the first heat exchange unit into the first chamber and a second chamber.
5. The heat exchange system according to claim 4, characterized in that: The first heat exchange unit further includes two fans, and the two fans are respectively disposed at the first outlet and the second outlet.
6. The heat exchange system according to claim 3, characterized in that: The second heat exchange unit includes a conduit, which is U-shaped and arranged in the soil below the cabinet. The conduit is formed with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively connected to the refrigerant pipeline.
7. The heat exchange system according to claim 6, characterized in that: The lower pipe section of the conduit is arranged in the water permeable layer of the soil.
8. The heat exchange system according to claim 7, characterized in that: The number of the conduits is multiple, and the multiple conduits are arranged in parallel on the refrigerant pipeline.
9. The heat exchange system according to claim 6, characterized in that: The control valve includes a three-way valve A and a three-way valve B. The three interfaces of the three-way valve A and the three-way valve B are respectively connected to the two ends of the circulation pipeline and the refrigerant pipeline, and the three-way valve A and the three-way valve B are respectively connected to the control unit signal to control the connection and disconnection of different interfaces.
10. An electric vehicle charging pile, characterized in that: The electric vehicle charging pile comprises a heat exchange system as described in any one of claims 1-9.