Temperature control system of thermal protection device and locomotive

Abstract

The utility model discloses a kind of temperature control systems of heat guarantee device, comprising: liquid cooling main road, for circulating heat exchange fluid capable of realizing heat exchange with heat management object;First heat exchange passage, the first heat exchange passage is heat-exchanged to outside by external heat exchanger;Second heat exchange passage, the second heat exchange passage is heat-exchanged to outside by compression refrigeration system;Valve equipment, for adjusting the heat exchange fluid flow proportion between first heat exchange passage and the second heat exchange passage;Pump group, for driving the heat exchange fluid flow in the liquid cooling main road, the pump group includes mutually series and the first pump body and the second pump body of same driving direction, the first pump body and the second pump body can be opened synchronously, the first pump body and / or the second pump body can be independently opened.The temperature control system of the heat guarantee device can effectively improve the problem that heat exchange flow adaptability is not good after liquid cooling main road heat exchange form changes.The utility model further discloses a kind of locomotive including above-mentioned temperature control system.

Description

Technical Field

[0001] This utility model relates to the field of equipment, and more specifically, to a temperature control system for a thermal protection device, and also to a locomotive including the above-mentioned temperature control system. Background Technology

[0002] To maintain the power batteries of new energy locomotives within a suitable operating temperature range, a power battery thermal management device is required to ensure their performance, safety, and extend battery life. Currently, liquid cooling technology is the primary method for thermal management of power batteries in new energy locomotives. The liquid cooling system simultaneously exchanges heat with the outside environment through both an outdoor dry cooler and a compression refrigeration system. The distribution of these two methods is then determined based on the actual ambient temperature and heat exchange power requirements.

[0003] In the process of realizing this invention, the inventors discovered that the prior art has at least the following problems: Currently, due to the combined use of two heat exchange methods, liquid cooling main circuit, the flow resistance changes when used in combination, resulting in poor flow of heat exchange fluid. Therefore, there is a problem that the heat exchange flow rate is not well adapted after the change of heat exchange method of liquid cooling main circuit. Utility Model Content

[0004] In view of this, the first objective of this utility model is to provide a temperature control system for a thermal protection device, which can effectively improve the problem of poor heat exchange flow adaptation after the change of heat exchange mode in the liquid-cooled main circuit. The second objective of this utility model is to provide a locomotive including the above-mentioned temperature control system.

[0005] To achieve the first objective mentioned above, this utility model provides the following technical solution:

[0006] A temperature control system for a thermal protection device, comprising:

[0007] The liquid-cooled main circuit is used to circulate heat exchange fluid that can exchange heat with the object under heat management;

[0008] The first heat exchange passage exchanges heat with the outside through an external heat exchanger;

[0009] The second heat exchange path exchanges heat with the outside through a compression refrigeration system;

[0010] A valve device used to adjust the flow rate ratio of the heat exchange fluid between the first heat exchange passage and the second heat exchange passage;

[0011] A pump set is used to drive the flow of heat exchange fluid in the liquid cooling main circuit. The pump set includes a first pump body and a second pump body connected in series and driven in the same direction. The first pump body and the second pump body can be turned on synchronously, and the first pump body and / or the second pump body can be turned on independently.

[0012] When multiple heat exchange paths are configured, and valve devices are needed to adjust the flow rate ratio of the heat exchange fluid between the first and second heat exchange paths, thereby regulating the heat exchange capacity of each path, changes in the pump assembly will occur. Simply changing the pump speed to adjust the head is insufficient to accommodate these adjustments. Therefore, two pumps (a first pump and a second pump) can be used to adapt to changes in the heat exchange mode of the liquid cooling main circuit based on the number of pumps activated, thus ensuring the overall heat exchange effect of the main circuit. In summary, the temperature control system of this thermal protection device effectively improves the problem of poor heat exchange flow rate adaptation after changes in the heat exchange mode of the liquid cooling main circuit.

[0013] In some technical solutions, the pump set includes a first branch connected in parallel with the first pump body and / or a second branch connected in parallel with the second pump body; the pump set also includes a valve set, which is used to selectively allow fluid to pass through one of the first pump body and the first branch, and / or to selectively allow fluid to pass through one of the second pump body and the second branch.

[0014] In some technical solutions, the valve assembly includes a first three-way valve and a second three-way valve. The inlet of the first three-way valve is used to introduce the heat exchange fluid, and the two optional outlets of the first three-way valve are respectively connected to the inlet of the first pump body and the first branch. The inlet of the second three-way valve is connected to the outlet of the first pump body, and the two optional outlets of the second three-way valve are respectively connected to the inlet of the second pump body and the second branch. The inlet of the second pump body is connected to the outlet of the first branch.

[0015] In some technical solutions, the first heat exchange passage and the second heat exchange passage are arranged in parallel; the valve device includes a first flow regulating valve arranged in the first heat exchange passage and / or a second flow regulating valve arranged in the second heat exchange passage.

[0016] In some technical solutions, the liquid cooling main circuit includes a return interface for introducing heat exchange fluid after heat exchange from the thermal management object and a supply interface for supplying heat exchange fluid to the thermal management object; the first heat exchange passage and the second heat exchange passage are both arranged between the pump group and the supply interface.

[0017] In some technical solutions, an expansion tank is provided on the inlet side of the pump set, and the exhaust side of the expansion tank is connected to the outlet side of the pump set; an exhaust valve is provided between the expansion tank and the inlet of the pump set; and a filter is provided at the return interface.

[0018] In some technical solutions, a return liquid temperature sensor and a return liquid pressure sensor are installed between the pump inlet and the return liquid interface; a supply liquid temperature sensor and a supply liquid pressure sensor are installed at the supply liquid interface.

[0019] In some technical solutions, a fan is also included, which is used to direct the airflow passing through the external heat exchanger into the condenser of the compression refrigeration system.

[0020] In some technical solutions, an intermediate heat exchanger is included, which includes a first heat exchange channel and a second heat exchange channel capable of exchanging heat with each other. The second heat exchange channel includes the first heat exchange channel and is the evaporator of the compression refrigeration system. The first heat exchange channel is connected in series with the external heat exchanger. The second heat exchange channel includes a channel heating device connected in series with the outlet of the first heat exchange channel.

[0021] To achieve the second objective mentioned above, this utility model also provides a locomotive, which includes a temperature control system of any of the aforementioned thermal protection devices, and a power battery. The power battery has a liquid-cooled heat exchange channel. The liquid-cooled main circuit of the temperature control system of the thermal protection device exchanges heat with the power battery by communicating with the liquid-cooled heat exchange channel or by exchanging heat with the liquid-cooled heat exchange channel through a heat exchanger. Since the temperature control system of the aforementioned thermal protection device has the above-mentioned technical effects, the locomotive with such a temperature control system should also have the corresponding technical effects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the temperature control system of the thermal protection device provided in this embodiment of the utility model.

[0024] The following labels are shown in the attached diagram:

[0025] 1. Liquid cooling main circuit; 2. First heat exchange passage; 3. Second heat exchange passage; 4. Valve equipment; 5. Pump group; 6. Compression refrigeration system; 7. External heat exchanger; 8. Expansion tank; 9. Exhaust valve; 10. Filter; 11. Return liquid temperature sensor; 12. Return liquid pressure sensor; 13. Fan; 14. Channel heating device; 15. Supply liquid temperature sensor; 16. Supply liquid pressure sensor; 17. Intermediate heat exchanger.

[0026] Return liquid inlet 1-1, supply liquid inlet 1-2;

[0027] First flow regulating valve 4-1, second flow regulating valve 4-2;

[0028] First pump body 5-1, second pump body 5-2, first branch 5-3, second branch 5-4, first three-way valve 5-5, second three-way valve 5-6;

[0029] Condenser 6-1, compressor 6-2, throttling element 6-3. Detailed Implementation

[0030] This utility model discloses a temperature control system for a thermal protection device, which can effectively improve the problem of poor heat exchange flow rate adaptation after the change of heat exchange mode in the liquid cooling main circuit.

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1 , Figure 1 A schematic diagram of the temperature control system of the thermal protection device provided in this embodiment of the utility model.

[0033] In some embodiments, a temperature control system for a thermal protection device is provided, which mainly includes a liquid cooling main circuit 1, a first heat exchange passage 2, a second heat exchange passage 3, a valve device 4, and a pump group 5.

[0034] The liquid-cooled main circuit 1 is used to circulate heat exchange fluid, which is capable of exchanging heat with the thermally managed object. This heat exchange fluid achieves heat exchange with the thermally managed object in at least two ways: One way is that the liquid-cooled main circuit 1 includes a return interface 1-1 for introducing the heat exchange fluid after heat exchange from the thermally managed object and a supply interface 1-2 for supplying the heat exchange fluid to the thermally managed object. In this case, the heat exchange fluid is directly introduced to the thermally managed object for direct heat exchange. The other way is to use a heat exchanger. When the heat exchange fluid flows through the heat exchanger, it exchanges heat through air cooling, contact with the power battery via the heat exchanger, or through other means such as heat exchange with the fluid after heat exchange with the thermally managed object. In this case, the heat exchange fluid in the liquid-cooled main circuit 1 does not flow through the thermally managed object but is further heat-exchanged through other media. The thermally managed object is, as described above, the power battery, especially the power battery of a new energy vehicle.

[0035] The first heat exchange passage 2 exchanges heat with the outside through the external heat exchanger 7. The specific heat exchange method can be at least the following two: the heat exchange fluid flowing through the first heat exchange passage 2 can flow directly through the external heat exchanger 7 to achieve heat exchange with the outside through the external heat exchanger 7; or the heat exchange fluid flowing through the first heat exchange passage 2 can exchange heat with the heat exchange fluid flowing through the external heat exchanger 7 through a plate heat exchanger to achieve heat exchange with the outside through the external heat exchanger 7.

[0036] The second heat exchange path 3 exchanges heat with the outside through the compression refrigeration system 6. Generally, the heat exchange fluid and the fluid flowing through the compression refrigeration system 6 are not of the same nature. Therefore, the heat exchange fluid in the second heat exchange path 3 and the heat exchange fluid in the compression refrigeration system 6 can exchange heat through an intermediate heat exchanger, which is generally a plate heat exchanger. In this context, heat exchange is not limited to heat dissipation but also includes heating, depending on the external temperature, the temperature control requirements of the object under thermal management, and the operating mode of the compression refrigeration system 6, etc., to meet the requirements.

[0037] The valve device 4 is used to adjust the flow rate ratio of the heat exchange fluid between the first heat exchange passage 2 and the second heat exchange passage 3, so that compression refrigeration heat exchange and natural heat exchange through the external heat exchanger 7 can be selected according to the actual environment and heat exchange needs. There are two specific adjustment methods: one is that the first heat exchange passage 2 and the second heat exchange passage 3 are connected in parallel, as shown in the embodiment below; the other is that the first heat exchange passage 2 and the second heat exchange passage 3 are connected in series, with the first heat exchange passage 2 located upstream of the second heat exchange passage 3 for external heat exchange first. However, at least one of the first heat exchange passages 2 and 3 has a parallel branch channel. For example, if the first heat exchange passage 2 has a parallel branch channel, changing the flow rate ratio between the branch channel and the first heat exchange passage 2 will change the flow rate ratio of the heat exchange fluid between the first heat exchange passage 2 and the second heat exchange passage 3. By adjusting the ratio, the ratio of heat exchange through the external heat exchanger 7 and heat exchange through the compression refrigeration system 6 is actually adjusted to adapt to environmental changes.

[0038] Pump unit 5 is used to drive the flow of heat exchange fluid in the liquid-cooled main circuit 1. The specific location of pump unit 5 is not limited, as long as it can drive the flow of heat exchange fluid in the liquid-cooled main circuit 1. Specifically, pump unit 5 can include a first pump body 5-1 and a second pump body 5-2 connected in series and with the same driving direction. The first pump body 5-1 and the second pump body 5-2 can be turned on simultaneously, and at least one can be turned on independently. That is, there are at least two working states: the first working state is that both the first pump body 5-1 and the second pump body 5-2 are turned on, at which time the pump unit 5 has the highest head, which can be defined as the first head; the second working state is that only one of the first pump body 5-1 and the second pump body 5-2 is turned on, at which time the pump unit 5 has a lower head, such as only the first pump body 5-1 is turned on, which can be defined as the second head, which is less than the first head. It should be noted that the fluid can pass through the second pump body 5-2 when it is closed, in which case the second pump body 5-2 should not interfere. The fluid can also pass through other parallel channels to bypass the second pump body 5-2.

[0039] Due to the adjustment of valve device 4, the flow ratio of the heat exchange fluid between the first heat exchange passage 2 and the second heat exchange passage 3 will change, resulting in a change in the flow resistance in the liquid cooling main circuit 1. For example: In one example, in parallel operation, if the first heat exchange passage 2 and the second heat exchange passage 3 are both open, and the operation is adjusted so that only one of the first heat exchange passage 2 or the second heat exchange passage 3 is open, the flow resistance increases, requiring an increase in head. At this time, pump group 5 can switch from single pump operation to dual pump operation. In another example, in series operation, if the first heat exchange passage 2 and the second heat exchange passage 3 are both open, and the operation is adjusted so that one of the first heat exchange passage 2 or the second heat exchange passage 3 is closed and the other is open, then the parallel channel (generally a straight channel is chosen, which has significantly lower flow resistance compared to the channel that needs heat exchange) connected to the liquid cooling main circuit 1 does not require heat exchange, and its flow resistance will be significantly lower. At this time, the resistance of the entire liquid cooling main circuit will decrease, and the head of pump group 5 can be reduced. At this time, pump group 5 can switch from dual pump operation to single pump operation.

[0040] Therefore, when multiple heat exchange paths are set up, and the flow rate ratio of the heat exchange fluid between the first heat exchange path 2 and the second heat exchange path 3 needs to be adjusted through valve device 4, thereby adjusting the heat exchange capacity of each of the first and second heat exchange paths 2 and 3, changes will occur in the pump group 5. At this time, simply changing the pump speed to achieve a change in head is difficult to adapt to such adjustments. Therefore, two pump bodies can be set up, namely the first pump body 5-1 and the second pump body 5-2, to adapt to changes in the heat exchange mode of the liquid cooling main circuit 1 according to the number of pumps being activated, thereby ensuring the overall heat exchange effect of the main circuit. In summary, the temperature control system of this heat protection device can effectively improve the problem of poor heat exchange flow rate adaptation after changes in the heat exchange mode of the liquid cooling main circuit 1.

[0041] It should be noted that pump unit 5 can either directly change the heat exchange fluid velocity of the liquid-cooled main circuit 1 by varying its power to adjust the heat exchange efficiency, or it can adaptively change its power based on changes in the flow resistance of the liquid-cooled main circuit 1 to maintain the flow rate. The power variation of pump unit 5 can be achieved by increasing the number of pumps in operation or by varying the power of a single pump.

[0042] It should also be noted that the number of pumps in pump unit 5 that are activated can be manually controlled according to the opening mode of valve device 4. Alternatively, pump unit 5 and valve device 4 can be linked to adjust their opening states synchronously. Specifically, the settings can be configured as needed.

[0043] In some embodiments, the pump assembly 5 may include a first branch 5-3 connected in parallel with the first pump body 5-1 and / or a second branch 5-4 connected in parallel with the second pump body 5-2; the pump assembly 5 may also include a valve assembly for selectively allowing fluid to pass through one of the first pump body 5-1 and the first branch 5-3, and / or for selectively allowing fluid to pass through one of the second pump body 5-2 and the second branch 5-4. This is so that when one pump body is shut down, the heat exchange fluid can bypass that pump body and flow through its branch, thereby improving the flow efficiency.

[0044] In one specific example, pump set 5 includes a first branch 5-3 connected in parallel with the first pump body 5-1 and a second branch 5-4 connected in parallel with the second pump body 5-2. The outlet of the first pump body 5-1 is connected to the inlet of the second pump body 5-2. When both the first pump body 5-1 and the second pump body 5-2 are open, the heat exchange fluid is selected by the valve group to pass through the first pump body 5-1 and the second pump body 5-2 sequentially instead of the first branch 5-3 and the second branch 5-4, thus achieving dual-pump operation. When the first pump body 5-1 is closed and the second pump body 5-2 is open, the heat exchange fluid is selected by the pump set 5 to pass through the first branch 5-3 and the second pump body 5-2 sequentially, without passing through the first pump body 5-1 and the second branch 5-4, thus achieving single-pump operation. With the second pump body 5-2 closed and the first pump body 5-1 open, the heat exchange fluid can be selected by the pump group 5 so that it passes through the first pump body 5-1 and the second branch 5-4 in sequence, instead of passing through the first branch 5-3 and the second pump body 5-2, thus achieving single-pump operation.

[0045] It should be noted that the valve assembly can select multiple switching valves, which can be respectively set at both ends of the first pump body 5-1, both ends of the first branch 5-3, both ends of the second pump body 5-2, and both ends of the second branch 5-4. However, this setting will use too many switching valves.

[0046] In some embodiments, the valve assembly may include a first three-way valve 5-5 and a second three-way valve 5-6. The inlet of the first three-way valve 5-5 is used to introduce heat exchange fluid into the liquid cooling main circuit 1. The two optional outlets of the first three-way valve 5-5 are respectively connected to the inlet of the first pump body 5-1 and the first branch circuit 5-3, so that the introduced heat exchange fluid can be controlled by the first three-way valve 5-5 to selectively enter the first pump body 5-1 or the first branch circuit 5-3. Specifically, controlled by the first three-way valve 5-5: when the first pump body 5-1 is open, the fluid enters the first pump body 5-1 without passing through the first branch circuit 5-3; when the first pump body 5-1 is closed, the fluid enters the first branch circuit 5-3 without passing through the first pump body 5-1.

[0047] The inlet of the second three-way valve 5-6 is connected to the outlet of the first pump body 5-1. The two optional outlets of the second three-way valve 5-6 are connected to the inlet of the second pump body 5-2 and the second branch 5-4, respectively. This allows the heat exchange fluid at the outlet of the first pump body 5-1 to be selectively directed to either the second pump body 5-2 or the second branch 5-4, controlled by the second three-way valve 5-6. Specifically, when the second pump body 5-2 is open, the fluid flows through the second pump body 5-2 without passing through the second branch 5-4; conversely, when the second pump body 5-2 is closed, the fluid flows through the second branch 5-4 without passing through the second pump body 5-2.

[0048] The inlet of the second pump body 5-2 is connected to the outlet of the first branch 5-3. This connection can be direct and does not require any other on / off valves. When the first pump body 5-1 is closed, the heat exchange fluid flows through the first three-way valve 5-5, the first branch 5-3, and the second pump body 5-2. At this time, the second pump body 5-2 is open.

[0049] In the above-mentioned pump set 5: on the one hand, it can be achieved by using a small number of three-way valves, which makes the structure more compact compared to using too many switching valves; on the other hand, by changing the first three-way valve 5-5, the outlet of the first three-way valve 5-5 corresponding to the first pump body 5-1 can be disconnected, and the second three-way valve 5-6 can be fully closed, so that the inlet corresponding to the first pump body 5-1 can be disconnected. Then the first pump body 5-1 can be disassembled for maintenance without affecting the independent operation of the second pump body 5-2.

[0050] It should be noted that both the first pump body 5-1 and the second pump body 5-2 can be turned on independently.

[0051] Furthermore, a switching valve can be installed at the outlet end of the second pump body 5-2 so that when the second pump body 5-2 is damaged, the outlet of the first three-way valve 5-5 corresponding to the first branch 5-3 can be closed, the outlet of the second three-way valve 5-6 corresponding to the second pump body 5-2 can be closed, and the aforementioned switching valve can be closed. At this time, the second pump body 5-2 can be disassembled, and the first pump body 5-1 can operate normally.

[0052] In some embodiments, the first heat exchange passage 2 and the second heat exchange passage 3 can be arranged in parallel; the valve device 4 includes a first flow regulating valve 4-1 disposed in the first heat exchange passage 2 and / or a second flow regulating valve 4-2 disposed in the second heat exchange passage 3. The flow rate is adjusted by the first flow regulating valve 4-1 and / or the second flow regulating valve 4-2, changing the flow distribution ratio of the liquid cooling main circuit 1. That is, part of the heat exchange fluid in the liquid cooling main circuit 1 passes through the first heat exchange passage 2, and the other part passes through the second heat exchange passage 3, and the ratio of these two parts can be adjusted by the aforementioned flow regulating valves. The heat exchange fluid after heat exchange in the first heat exchange passage 2 and the heat exchange fluid after heat exchange in the second heat exchange passage 3 merge and are supplied to the thermal management object, as shown in the attached figure, to the liquid supply interface 1-2. Based on the heat exchange efficiency of the external heat exchanger 7, the above distribution ratio can be adjusted to allow more heat exchange from the external heat exchanger 7 while meeting heat dissipation requirements, thereby reducing overall energy consumption.

[0053] In one example, only the first heat exchange passage 2 is equipped with a first flow regulating valve 4-1. When the first flow regulating valve 4-1 is closed, all the heat exchange fluid passes through the second heat exchange passage 3. At this point, the resistance is at its maximum, and a larger head is required. Dual pumps can be activated to meet the heat dissipation requirements, primarily through the compression refrigeration system 6. As the opening of the first flow regulating valve 4-1 gradually increases, some of the heat exchange fluid will pass through the first heat exchange passage 2. When the first flow regulating valve 4-1 is fully open, part of the heat exchange fluid passes through the first heat exchange passage 2, and the other part passes through the second heat exchange passage 3. At this point, the head is relatively small, and a single pump can be activated. To meet the heat dissipation requirements, part of the heat exchange fluid flows into the first heat exchange passage 2 for heat dissipation through the external heat exchanger 7, while the other part flows into the second heat exchange passage 3 for heat exchange through the compression refrigeration system 6. The two parts of the heat exchange fluid are then mixed and supplied to the heat management target.

[0054] In one example, the first heat exchange passage 2 is equipped with a first flow regulating valve 4-1, and the second heat exchange passage 3 is equipped with a second flow regulating valve 4-2. When the first flow regulating valve 4-1 is closed and the second flow regulating valve 4-2 is fully open, all the heat exchange fluid passes through the second heat exchange passage 3. At this time, the resistance is relatively high, and a larger head is required. It is advisable to operate two pumps to meet the heat dissipation requirements, which are mainly achieved through the compression refrigeration system 6. As the opening of the first flow regulating valve 4-1 gradually increases, some of the heat exchange fluid will pass through the first heat exchange passage 2. When the first flow regulating valve 4-1 is fully open, part of the heat exchange fluid passes through the first heat exchange passage 2, and the other part passes through the second heat exchange passage 3. At this time, the resistance is relatively low, and a smaller head is required. It is advisable to operate a single pump. To meet the heat dissipation requirements, part of the heat exchange fluid flows into the first heat exchange passage 2 for heat dissipation through the external heat exchanger 7, and the other part flows into the second heat exchange passage 3 for heat exchange through the compression refrigeration system 6. Furthermore, the opening of the second flow regulating valve 4-2 can be gradually reduced. At this time, the proportion of heat exchange fluid allocated to the first heat exchange passage 2 will gradually increase, while the proportion allocated to the second heat exchange passage 3 will gradually decrease. When the second flow regulating valve 4-2 is completely closed, the resistance is higher, and the required head will also be higher; therefore, it is advisable to activate both pumps.

[0055] In some embodiments, the liquid-cooled main circuit 1 can exchange heat with the fluid in the thermally managed object through a heat exchanger, which can easily lead to heat loss.

[0056] The liquid cooling main circuit 1 can include a return port 1-1 for introducing heat exchange fluid from the heat-managed object and a supply port 1-2 for supplying heat exchange fluid to the heat-managed object, so as to directly introduce the heat exchange fluid to the heat-managed object for heat exchange. The first heat exchange passage 2 and the second heat exchange passage 3 are connected in series or in parallel between the return port 1-1 and the supply port.

[0057] The first heat exchange passage 2 and the second heat exchange passage 3 are both located between the pump group 5 and the liquid supply interface 1-2, so that the pump group 5 can directly supply liquid to the first heat exchange passage 2 and the second heat exchange passage 3, avoiding direct liquid supply through the liquid supply interface 1-2, which would result in a relatively high pressure at the liquid supply interface 1-2.

[0058] Alternatively, both the first heat exchange passage 2 and the second heat exchange passage 3 can be located between the return liquid interface 1-1 and the pump group 5.

[0059] In some embodiments, an expansion tank 8 may be provided on the inlet side of the pump unit 5, and the exhaust side of the expansion tank 8 may be connected to the outlet side of the pump unit 5 to balance the system pressure and reduce the gas content in the heat exchange fluid passing through the pump unit 5. Specifically, the expansion tank 8 may be an expansion water tank.

[0060] Specifically, an exhaust valve 9 can be installed between the expansion tank 8 and the inlet of the pump unit 5 to further reduce the gas content in the heat exchange fluid passing through the pump unit 5.

[0061] In some embodiments, in order to effectively control flow resistance while ensuring heat exchange efficiency, a filter 10 may be provided at the return liquid interface 1-1.

[0062] In some embodiments, a return liquid temperature sensor 11 and a return liquid pressure sensor 12 may be installed between the inlet of the pump unit 5 and the return liquid interface 1-1; a supply liquid temperature sensor 15 and a supply liquid pressure sensor 16 may be installed at the supply liquid interface 1-2. In practical applications, the supply liquid temperature sensor 15 and the return liquid temperature sensor 11 can be compared as needed, and temperature adjustment can be achieved by adjusting at least one or more of the following: the power of the pump unit 5, the external heat exchange efficiency of the external heat exchanger 7, and the operating efficiency of the compression refrigeration system 6. Pressure changes can also be obtained from the return liquid pressure sensor 12 and the supply liquid pressure sensor 16, so that the power of the pump unit 5 can be adjusted when the pressure is unsatisfactory.

[0063] In some embodiments, both the return interface 1-1 and the supply interface 1-2 may be provided with injection ports, which provides better reliability compared to providing injection ports at a single location.

[0064] In some embodiments, the condenser 6-1 of the compression refrigeration system 6 can be externally air-cooled, in which case a fan 13 needs to be provided. The corresponding external heat exchanger 7 can also be externally air-cooled, in which case a fan 13 is provided. Fans 13 can be provided separately. In order to make the structure more compact, and since both the condenser 6-1 and the external heat exchanger 7 are turned on in most operating conditions, the fan 13 can be used to allow the air passing through the external heat exchanger 7 to enter the condenser 6-1 of the compression refrigeration system 6, so that the external air first absorbs heat from the external heat exchanger 7 and then absorbs heat from the condenser 6-1.

[0065] As shown in the attached diagram, the external heat exchanger 7 can be divided into two parallel heat exchange units, and the condenser 6-1 can be divided into two parallel condensation units. On both sides of the fan 13, one heat exchange unit and one condensation unit are stacked. Specifically, the external heat exchanger 7 is like a dry cooler.

[0066] In some embodiments, an intermediate heat exchanger 17 may be provided. The intermediate heat exchanger 17 includes a first heat exchange channel and a second heat exchange channel capable of exchanging heat with each other. The second heat exchange channel 3 includes the first heat exchange channel and is the evaporator of the compression refrigeration system 6. The intermediate heat exchanger facilitates heat exchange between the first heat exchange channel 2 and the compression refrigeration system 6.

[0067] A simple compression refrigeration system 6 mainly includes an evaporator (second heat exchange channel), a compressor 6-2, a condenser 6-1, and a throttling element 6-3.

[0068] Specifically, the compression refrigeration system 6 may include, in sequence, a second heat exchange channel, a refrigerant inlet, a suction temperature sensor, a low-pressure sensor, a gas-liquid separator, a compressor 6-2, a one-way valve, a discharge temperature sensor, a refrigerant inlet, a high-pressure sensor, a high-pressure switch, a condenser 6-1, a refrigerant inlet, a filter 10, a sight glass, and an electronic expansion valve (throttling element 6-3).

[0069] In some embodiments, the first heat exchange passage 2 may be connected in series with the external heat exchanger 7 so that the heat exchange fluid can flow directly into the external heat exchanger 7 for heat exchange, thereby improving the heat exchange efficiency.

[0070] In some embodiments, the second heat exchange passage 3 includes a channel heating device 14 connected in series with the outlet of the first heat exchange passage to heat the object under heat management. Alternatively, the channel heating device 14 can be connected in parallel with both the first heat exchange passage 2 and the second heat exchange passage 3. The channel heating device 14 is generally an electric heating device.

[0071] Based on the temperature control system of the thermal protection device provided in the above embodiments, this utility model also provides a locomotive. The locomotive includes the temperature control system of any one of the thermal protection devices in the above embodiments, and further includes a power battery. The power battery has a liquid-cooled heat exchange channel. The liquid-cooled main circuit 1 of the temperature control system of the thermal protection device exchanges heat with the power battery by communicating with the liquid-cooled heat exchange channel or by exchanging heat with the liquid-cooled heat exchange channel through a heat exchanger. Since this locomotive adopts the temperature control system of the thermal protection device in the above embodiments, the beneficial effects of this locomotive can be found in the above embodiments.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those 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 is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature control system for a thermal protection device, characterized in that, include: The liquid-cooled main circuit (1) is used to circulate heat exchange fluid that can exchange heat with the object under heat management; The first heat exchange passage (2) exchanges heat with the outside through the external heat exchanger (7); The second heat exchange passage (3) exchanges heat with the outside through the compression refrigeration system (6); Valve device (4) is used to adjust the ratio of heat exchange fluid flow rate between the first heat exchange passage (2) and the second heat exchange passage (3); Pump set (5) is used to drive the flow of heat exchange fluid in the liquid cooling main circuit (1). The pump set (5) includes a first pump body (5-1) and a second pump body (5-2) connected in series and with the same driving direction. The first pump body (5-1) and the second pump body (5-2) can be turned on synchronously, and the first pump body (5-1) and / or the second pump body (5-2) can be turned on independently.

2. The temperature control system of the thermal protection device according to claim 1, characterized in that, The pump assembly (5) includes a first branch (5-3) connected in parallel with the first pump body (5-1) and / or a second branch (5-4) connected in parallel with the second pump body (5-2); the pump assembly (5) also includes a valve assembly for selectively allowing fluid to pass through one of the first pump body (5-1) and the first branch (5-3), and / or for selectively allowing fluid to pass through one of the second pump body (5-2) and the second branch (5-4).

3. The temperature control system of the thermal protection device according to claim 2, characterized in that, The valve assembly includes a first three-way valve (5-5) and a second three-way valve (5-6). The inlet of the first three-way valve (5-5) is used to introduce the heat exchange fluid. The two optional outlets of the first three-way valve (5-5) are respectively connected to the inlet of the first pump body (5-1) and the first branch (5-3). The inlet of the second three-way valve (5-6) is connected to the outlet of the first pump body (5-1). The two optional outlets of the second three-way valve (5-6) are respectively connected to the inlet of the second pump body (5-2) and the second branch (5-4). The inlet of the second pump body (5-2) is connected to the outlet of the first branch (5-3).

4. The temperature control system of the thermal protection device according to any one of claims 1-3, characterized in that, The first heat exchange passage (2) and the second heat exchange passage (3) are arranged in parallel; the valve device (4) includes a first flow regulating valve (4-1) arranged in the first heat exchange passage (2) and / or a second flow regulating valve (4-2) arranged in the second heat exchange passage (3).

5. The temperature control system of the thermal protection device according to claim 4, characterized in that, The liquid cooling main circuit (1) includes a return interface (1-1) for introducing heat exchange fluid after heat exchange from the heat management object and a supply interface (1-2) for supplying heat exchange fluid to the heat management object; the first heat exchange passage (2) and the second heat exchange passage (3) are both located between the pump group (5) and the supply interface (1-2).

6. The temperature control system of the thermal protection device according to claim 5, characterized in that, An expansion tank (8) is provided on the inlet side of the pump set (5), and the exhaust side of the expansion tank (8) is connected to the outlet side of the pump set (5); an exhaust valve (9) is provided between the expansion tank (8) and the inlet of the pump set (5); a filter (10) is provided at the return interface (1-1).

7. The temperature control system of the thermal protection device according to claim 6, characterized in that, A return liquid temperature sensor (11) and a return liquid pressure sensor (12) are provided between the inlet of the pump unit (5) and the return liquid interface (1-1); a supply liquid temperature sensor (15) and a supply liquid pressure sensor (16) are provided at the supply liquid interface (1-2).

8. The temperature control system of the thermal protection device according to claim 4, characterized in that, It also includes a fan (13) for directing airflow through the external heat exchanger (7) into the condenser (6-1) of the compression refrigeration system (6).

9. The temperature control system of the thermal protection device according to claim 3, characterized in that, The system includes an intermediate heat exchanger (17), which includes a first heat exchange channel and a second heat exchange channel capable of exchanging heat with each other. The second heat exchange channel (3) includes the first heat exchange channel and is the evaporator of the compression refrigeration system (6). The first heat exchange channel (2) is connected in series with the external heat exchanger (7). The second heat exchange channel (3) includes a channel heating device (14) connected in series with the outlet of the first heat exchange channel.

10. A locomotive, comprising a power battery, said power battery having a liquid-cooled heat exchange channel, characterized in that, The thermal protection device includes a temperature control system as described in any one of claims 1-9, wherein the liquid cooling main circuit (1) of the thermal protection device's temperature control system achieves heat exchange with the power battery by communicating with the liquid cooling heat exchange channel or by exchanging heat with the liquid cooling heat exchange channel through a heat exchanger.

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