A high-precision temperature control system

Abstract

The application relates to the technical field of temperature control, and particularly discloses a high-precision temperature control system, which comprises a first heat exchanger and a second heat exchanger, a first interface of the first heat exchanger is communicated with a first interface of the second heat exchanger, at least one heating branch is arranged between a second interface of the second heat exchanger and a second interface of the first heat exchanger, at least two temperature sensors are arranged in an outlet pipeline of the heating branch, fixed parts are arranged in the outlet pipeline and corresponding to the temperature sensors respectively, the temperature sensors are fixed on the corresponding fixed parts respectively, and probes of the temperature sensors are located on the same radial section of the outlet pipeline. The temperature control cooling system provided by the application realizes high precision through the parallel connection of the at least two temperature sensors, the requirement for the precision of a single temperature sensor is reduced, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, and more specifically, to a high-precision temperature control system. Background Technology

[0002] For existing applications in high-precision temperature control and cooling, such as high-precision temperature control air conditioning cooling systems, please refer to [link / reference]. Figure 1 The first port of the first heat exchanger 01 is connected to the first port of the second heat exchanger 02. The second port of the second heat exchanger 02 is connected to the second port of the first heat exchanger 01 in sequence via the heater 03 and the heat buffer 04. The first heat exchanger 01 is the terminal heat exchanger. After exchanging heat with the equipment, the temperature of the heat exchange medium inside it rises. The high-temperature heat exchange medium flows back to the second heat exchanger 02, where it is cooled again. After passing through the heater 03 and the heat buffer 04, it flows back into the first heat exchanger 01 to cool the external environment or equipment.

[0003] In the field of high-precision temperature control and cooling, such as high-precision temperature control air conditioning cooling systems, in order to accurately measure the fluid temperature of the medium in its circuit and achieve precise control, it is usually necessary to use high-precision temperature sensors that are matched with the high-precision temperature control air conditioning cooling system to detect the fluid temperature. That is, expensive high-precision temperature sensors are used. At present market prices, if the accuracy of the temperature sensor is increased by an order of magnitude, its price will increase by more than ten times or even dozens of times.

[0004] In conclusion, how to effectively solve problems such as improving the accuracy of temperature detection is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a temperature-controlled cooling system, the structural design of which can effectively solve the problem of improving the accuracy of temperature detection.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-precision temperature control system includes a first heat exchanger and a second heat exchanger. A first interface of the first heat exchanger is connected to a first interface of the second heat exchanger. At least one heating branch is provided between the second interface of the second heat exchanger and the second interface of the first heat exchanger. A temperature detection device for detecting fluid temperature is provided in the outlet pipe of the heating branch. The temperature detection device includes at least two temperature sensors. A fixing part corresponding to each of the temperature sensors is provided on the outlet pipe. Each temperature sensor is fixed on its corresponding fixing part, and the probe of each temperature sensor is located on the same radial section of the outlet pipe.

[0008] Optionally, in the above-mentioned high-precision temperature control system, the fixing part is an installation pipe provided on the outer wall of the outlet pipe, and the outlet pipe has a through hole, the temperature sensor passes through the through hole and is sealed and fixed to the through hole, and the probe of the temperature sensor is located in the cavity of the outlet pipe.

[0009] Optionally, in the above-mentioned high-precision temperature control system, the mounting pipe is radially inclined relative to the outlet pipe.

[0010] Optionally, in the above-mentioned high-precision temperature control system, the projection of the inclination direction of the outer end of the mounting tube to the end connected to the outlet pipe onto the axial direction of the outlet pipe is consistent with the fluid flow direction in the outlet pipe.

[0011] Optionally, in the above-mentioned high-precision temperature control system, the heating branch includes a first heating branch and a second heating branch connected in sequence to the second heat exchanger, and the temperature detection device includes a corresponding first temperature detection device and a second temperature detection device. The detection accuracy of the second temperature detection device installed on the outlet pipe of the second heating branch is higher than the detection accuracy of the first temperature detection device installed on the outlet pipe of the first heating branch.

[0012] Optionally, in the above-mentioned high-precision temperature control system, the first heating branch includes a first heater or a first bypass branch, the inlet of the first bypass branch is connected to the first interface of the second heat exchanger, and the outlet of the first bypass branch is connected to the second interface of the second heat exchanger.

[0013] Optionally, in the above-mentioned high-precision temperature control system, the second heating branch includes a second heater or a second bypass branch, the inlet of the second bypass branch is connected to the inlet of the first bypass branch, and the outlet of the second bypass branch is connected to the outlet of the first heating branch.

[0014] Optionally, in the above-mentioned high-precision temperature control system, the temperature detection device further includes a third temperature detection device, which is disposed at the second interface of the second heat exchanger.

[0015] Optionally, in the above-mentioned high-precision temperature control system, the accuracy of the first temperature detection device and the third temperature detection device is within ±0.3℃, and the accuracy of the second temperature detection device is within ±0.1℃.

[0016] Optionally, the above-mentioned high-precision temperature control system further includes a first mixer and a second mixer. The inlet of the first mixer is connected to the outlet of the first bypass branch and the second interface of the second heat exchanger, respectively. The inlet of the second mixer is connected to the outlet of the first mixer and the outlet of the second bypass branch, and the outlet of the second mixer is connected to the second interface of the first heat exchanger. Both the first mixer and the second mixer are provided with at least one baffle component, and the baffle component has a gap with the inner wall of the first mixer or the second mixer. The outlet of the first mixer is also provided with a collection box for storing the heat exchange medium. A circulation pump and / or pressure sensor are provided between the inlet of the first heating branch and the outlet of the second heating branch.

[0017] The high-precision temperature control system provided by this invention involves a high-temperature heat exchange medium flowing from the first port of a first heat exchanger through a second heat exchanger for cooling to near the target cooling temperature (slightly lower than the target cooling temperature). Temperature compensation is then performed via at least one heating branch, and the adjusted heat exchange medium is delivered to the second port of the first heat exchanger. After the first heat exchanger absorbs heat from the device or environment requiring cooling, the high-temperature heat exchange medium flows out from the first port, forming a circulation loop. Temperature detection is achieved using at least two temperature sensors connected in parallel within the outlet pipes of the heating branches. Since the probes of the at least two temperature sensors in each outlet pipe are located on the same radial cross-section of the corresponding outlet pipe, the actual fluid temperature detected by each temperature sensor is the same. Therefore, by acquiring the detection data from the temperature sensors and using multi-parameter integration, averaging, or PID control methods to eliminate large fluctuations and deviations between different sensors, high-precision temperature control is achieved, thereby improving the accuracy of the temperature-controlled cooling system. Furthermore, by using at least two temperature sensors connected in parallel, high precision is achieved while reducing the accuracy requirements of individual temperature sensors, thus lowering costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a temperature-controlled cooling system in the prior art;

[0020] Figure 2 This is a schematic diagram of the structure of a high-precision temperature control cooling system according to a specific embodiment of the present invention;

[0021] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0022] Figure 4 for Figure 3 Schematic diagram of AA section;

[0023] Figure 5 for Figure 3 Another perspective illustration;

[0024] Figure 6 This is a schematic diagram of the structure of a high-precision temperature control cooling system according to another specific embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of a high-precision temperature control cooling system according to another specific embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of a high-precision temperature control cooling system according to another specific embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of a high-precision temperature control cooling system according to another specific embodiment of the present invention;

[0028] Figure 10-1 This is a schematic diagram showing the change of real-time temperature data from two temperature sensors over time.

[0029] Figure 10-2 This is a schematic diagram showing the temperature fluctuation after averaging.

[0030] Figure 11-1 This is a schematic diagram showing the change of real-time temperature data from three temperature sensors over time.

[0031] Figure 11-2 This is a schematic diagram showing the temperature fluctuation after averaging.

[0032] Figure 11-3 This is a diagram illustrating fluctuations at various levels.

[0033] The following labels are shown in the attached diagram:

[0034] First heat exchanger 1, second heat exchanger 2, inlet A1 of the first bypass branch, outlet B1 of the first bypass branch, inlet A2 of the second bypass branch, outlet B2 of the second bypass branch, regulating valve 3, mixer 4, baffle component 41, heat buffer 5, heater 6, circulating pump 7, collection tank 8, bypass regulating valve 9, outlet pipe 10, fixing part 11, through hole 12, temperature sensor 13. Detailed Implementation

[0035] This invention discloses a high-precision temperature control and cooling system to achieve high-precision detection at a lower cost.

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 2-5 , Figure 2 This is a schematic diagram of the temperature-controlled cooling system according to the first specific embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 for Figure 3 Schematic diagram of AA section; Figure 5 for Figure 3 Another perspective illustration.

[0038] In one embodiment, the high-precision temperature control and cooling system provided by the present invention includes a first heat exchanger 1, a second heat exchanger 2, and at least one heating branch. The first heat exchanger 1 serves as a terminal heat exchanger for exchanging heat with the device or environment requiring cooling. The second heat exchanger 2 cools the high-temperature heat exchange medium flowing out of the first heat exchanger 1. It is understood that the heat exchange medium includes, but is not limited to, coolant such as cooling water; fluids such as gases can also be used as needed. The first interface of the first heat exchanger 1 is connected to the first interface of the second heat exchanger 2, and the second interface of the second heat exchanger 2 is connected to the first interface of the first heat exchanger 1 through at least one heating branch. The heating branch heats and adjusts the temperature of the heat exchange medium, which, after being cooled by the second heat exchanger 2, is slightly below the target cooling temperature, so that the temperature accuracy of the heat exchange medium is achieved through slow heating. The first port of the first heat exchanger 1 is the return port, and the second port is the outlet port. The heat exchange medium flowing out of the outlet port is supplied to the device that needs cooling. The return port absorbs the temperature of the device after passing through the first heat exchanger 1 and then flows through the second heat exchanger 2 for cooling. At least two temperature sensors 13 are installed in the outlet pipe 10 of the heating branch. A fixing part 11 is respectively provided on the outlet pipe 10 and each temperature sensor 13. Each temperature sensor 13 is fixed to its corresponding fixing part 11, and the probes of each temperature sensor 13 are located on the same radial cross-section of the outlet pipe 10. It can be understood that the radial cross-section is the cross-section along the radial direction, and the actual temperature of the fluid in the outlet pipe 10 is the same on this cross-section. Since the probes of each temperature sensor 13 are located on the same radial cross-section, the actual temperature of the fluid detected by each temperature sensor is the same. By acquiring the detected temperature of each temperature sensor and analyzing the detected temperature, the actual temperature of the fluid can be reflected more accurately. The specific position of the probe of the temperature sensor 13 is controlled according to the fixing part 11 and the fixing of the temperature sensor 13. The number of temperature sensors 13 is preferably odd.

[0039] Using the high-precision temperature control system provided by this invention, the high-temperature heat exchange medium flowing out of the first port of the first heat exchanger 1 flows through the second heat exchanger 2 for cooling to reach a temperature close to the target cooling temperature, which is slightly lower than the target cooling temperature. It then undergoes heating and temperature regulation through at least one heating branch, achieving high precision in the temperature of the heat exchange medium through slow heating. The high-precision heat exchange medium is then delivered to the second port of the first heat exchanger 1. After the first heat exchanger 1 absorbs heat from the device or environment requiring cooling, the high-temperature heat exchange medium flows out from the first port, forming a circulation loop. Temperature detection is performed using a temperature detection device with at least two temperature sensors 13 connected in parallel within the outlet pipe 10 of the heating branch. Since the probes of the at least two temperature sensors 13 in each outlet pipe 10 are located on the same radial cross-section of the corresponding outlet pipe, the actual fluid temperature detected by each temperature sensor 13 is the same. Therefore, by acquiring the detection data from temperature sensor 13 and using multi-parameter integration, averaging, or PID control methods, large fluctuations and deviations between different sensors are eliminated, achieving high-precision temperature control and improving the accuracy of the temperature-controlled cooling system. Furthermore, by connecting at least two temperature sensors 13 in parallel, high precision is achieved while reducing the accuracy requirements of individual temperature sensors, thereby lowering costs.

[0040] In this embodiment, at least two temperature sensors in each temperature detection device are temperature sensors with the same or similar accuracy, and at least two temperature sensors are installed in parallel. For example, the accuracy of at least two temperature sensors is ±0.1℃, ±0.3℃, 0.5℃, 1.0℃, etc.; for example, if the accuracy of multiple temperature sensors used is ±0.3℃, then the high-precision temperature detection system and method of this embodiment can achieve a temperature detection accuracy of ±0.03℃.

[0041] In one embodiment, the fixing part 11 is a mounting tube provided on the outer wall of the outlet pipe 10, and the outlet pipe 10 has a through hole 12. The temperature sensor passes through the through hole 12 and is sealed with the through hole 12, and the probe of the temperature sensor 13 is located in the cavity of the outlet pipe 10. It can be understood that by providing a through hole 12 on the outlet pipe 10, when the temperature sensor 13 is installed in the mounting tube, the probe passes through the through hole 12 to be inserted into the cavity of the outlet pipe 10, thereby being able to directly contact the fluid in the outlet pipe 10 to detect its temperature, which further helps to improve the detection accuracy. The sealing method between the temperature sensor 13 and the through hole 12 can be a sealant, which ensures sealing while also playing a fixing role, making the overall structure more stable and reliable. Alternatively, the temperature sensor 13 and the through hole 12 can also be sealed by a conventional sealing method such as a sealing ring. The specific structure of the mounting tube is set according to the structure of the temperature sensor 13 to accommodate and fix the temperature sensor 13.

[0042] In one embodiment, the mounting tube is radially inclined relative to the outlet pipe 10. It is understood that radial inclination relative to the outlet pipe 10 means that the extension direction of the mounting tube forms an angle greater than zero and less than 90 degrees with the radial direction of the outlet pipe 10. This inclined mounting tube provides more installation space compared to a radially inclined mounting tube. Especially for outlet pipes 10 with smaller diameters, the inclined mounting tube, allowing the temperature sensor 13 to be inserted at an angle, makes it less likely for it to contact the inner wall of the outlet pipe 10 opposite to the through hole 12, thus allowing for the installation of longer temperature sensors 13. Of course, depending on the pipe diameter and the size of the temperature sensor 13, the mounting tube can also be radially inclined along the outlet pipe 10, with the temperature sensor 13 inserted radially along the outlet pipe 10.

[0043] In one embodiment, the projection of the inclination direction of the outer end of the mounting tube to the end connected to the outlet pipe 10 onto the axial direction of the outlet pipe 10 is consistent with the fluid flow direction within the outlet pipe 10. Therefore, after the temperature sensor 13 is inserted, its inclination direction follows the fluid flow direction within the outlet pipe 10. Compared to a situation where the inclination direction of the temperature sensor 13 is opposite to the fluid flow direction, the reverse orientation of the outlet pipe 10 results in a greater impact on the probe of the temperature sensor 13. Thus, the unidirectional orientation reduces the adverse effects of fluid impact on the temperature detection accuracy of the temperature sensor 13, further ensuring detection accuracy.

[0044] In one embodiment, the fixing part 11 is a blind hole provided on the outlet pipe 10, and the temperature sensor 13 is disposed in the blind hole, with the probe of the temperature sensor 13 contacting the bottom of the blind hole. Unlike the embodiment described above where a through hole 12 is provided on the outlet pipe 10 and the probe of the temperature sensor 13 extends into the inner cavity of the outlet pipe 10 through the through hole 12, in this embodiment, a blind hole is provided on the outlet pipe 10, and this blind hole serves as the fixing part 11 to fix the temperature sensor 13 in place. The probe of the temperature sensor 13 contacts the bottom of the blind hole to detect the temperature at the bottom of the hole. Since the bottom of the blind hole is located inside the inner cavity of the outlet pipe 10, it comes into contact with the fluid, and the temperature of the fluid is transferred to the blind hole. The temperature sensor 13 indirectly detects the temperature of the fluid inside the outlet pipe 10 by detecting the temperature at the bottom of the blind hole. In this embodiment, the temperature sensor 13 does not need to be sealed with the fluid inside the outlet pipe 10, resulting in a simple structure and convenient installation.

[0045] In other embodiments, the temperature sensors 13 can be directly fixed to the inner wall of the outlet pipe 10 by means of attachment, etc., and the probes of each temperature sensor 13 can be located at the same radial cross section of the outlet pipe 10. In this embodiment, the fixing part 11 can be a structure such as an attachment part provided on the inner wall of the outlet pipe 10.

[0046] In one embodiment, the temperature control cooling system further includes a controller, with each temperature sensor 13 electrically connected to the controller to send the detected temperature signal. The controller acquires the real-time temperature data detected by each temperature sensor 13, and based on this data, discards real-time temperature data that fluctuates beyond a preset deviation, averaging the remaining real-time temperature data as the detected temperature. Through the controller's settings, the detected temperatures of multiple temperature sensors 13 are analyzed to output the corresponding system detected temperature. In other embodiments, the detected temperatures of each temperature sensor 13 can also be manually calculated and analyzed, or input to an external control system or other equipment for analysis.

[0047] Specifically, the detected temperature can be obtained from each temperature sensor 13 located on the same radial cross section of the outlet pipe through the following steps:

[0048] S1: Acquire real-time temperature data detected by each temperature sensor 13;

[0049] S2: Based on the real-time temperature data of each temperature sensor 13, remove real-time temperature data that fluctuates beyond the preset deviation;

[0050] S3: The average value of the remaining real-time temperature data is taken as the detection temperature.

[0051] It is understandable that, since multiple temperature sensors 13 are set in parallel, and the actual temperature of the fluid detected by each temperature sensor 13 is the same, by analyzing the real-time temperature data of each temperature sensor 13, the real-time temperature data that fluctuates beyond the preset deviation is removed, and the remaining real-time temperature data is used as the effective temperature data for statistical analysis. The average value of the effective temperature data at the same moment is taken as the detection temperature at that moment, or the average value of the effective temperature data at multiple moments within a time period is taken as the detection temperature within that time period.

[0052] When setting up two temperature sensors, the preset deviation can be the deviation between multiple data points collected by the detection system from the two thermometers within a preset time period and at a preset sampling frequency. Normally, the detection system samples once every few hundred milliseconds; for example, once every 100ms-300ms. If the two temperature sensors each collect 10 data points per second, and since the collected data are all temperatures of the same fluid cross-section, and the actual fluid temperature is almost identical within that preset time period, then by comparing the 20 data points from the two temperature sensors, data exceeding the preset deviation value can be discarded. Specifically, this can be done as follows: Figures 10-1 to 10-2 As shown.

[0053] When setting three or more temperature sensors, the preset deviation can be the deviation between the real-time data collected by the three or more temperature sensors at a certain moment. That is, at a certain moment, the three or more temperature sensors collect three or more data points. By comparing multiple data points at that moment, those with deviations exceeding the preset deviation are discarded. Specifically, it can be as follows: Figures 11-1 to 11-3 As shown.

[0054] Step S1 above may specifically include: acquiring real-time temperature data within a preset time period detected by each temperature sensor 13; then, in step S3, taking the average of the remaining real-time temperature data as the corresponding detection temperature specifically includes: taking the average of all remaining real-time temperature data within the preset time period as the detection temperature within the corresponding time period. That is, acquiring real-time temperature data at multiple moments within the preset time period detected by each temperature sensor 13, analyzing the real-time temperature data of each temperature sensor 13, removing real-time temperature data with fluctuations exceeding a preset deviation, and using the remaining real-time temperature data as valid temperature data for statistical analysis, and taking the average of the valid temperature data at multiple moments within the preset time period as the detection temperature within the preset time period. Statistical analysis is performed within a preset time period. If the real-time temperature data of each temperature sensor 13 is removed at the same moment, the average of other valid temperature data within the preset time period can still be used as the detection data. Specifically, the time interval between two adjacent detections by each temperature sensor 13 can be set as needed, and the duration of the corresponding preset time period can also be set as needed.

[0055] Furthermore, real-time temperature data detected by each temperature sensor is acquired, specifically including: acquiring real-time temperature data detected by each temperature sensor within a preset time period and a preset acquisition frequency. That is, the real-time temperature data within a preset time period acquired at a preset acquisition frequency is used as the detection data of the temperature sensors for statistical analysis.

[0056] Specifically, based on the real-time temperature data from each temperature sensor, real-time temperature data with fluctuations exceeding a preset deviation are discarded. This includes discarding real-time temperature data with fluctuations exceeding a preset deviation of 15% or more. By discarding real-time temperature data with fluctuations exceeding a preset deviation of 15%, the quantity of valid temperature data is ensured, while data with large fluctuations is removed to avoid their influence, thereby improving detection accuracy.

[0057] Further, in step S2, real-time temperature data with fluctuations exceeding a preset deviation are removed. Specifically, this includes: using the upper and lower limits of the fluctuation of the real-time temperature data corresponding to each temperature sensor 13 within a preset time period as a benchmark, real-time temperature data exceeding the corresponding upper or lower limit of fluctuation are removed. It should be noted that the upper and lower limits of the fluctuation of the real-time temperature data corresponding to each temperature sensor 13 can be determined by the main fluctuation range of the real-time temperature data within the preset time period. The specific values ​​of the upper and lower limits of fluctuation can also be calculated and determined based on the real-time temperature data of the corresponding temperature sensor 13. For example, based on the real-time temperature data of the temperature sensor 13 within a preset time period, the average value is taken to obtain the temperature benchmark T0, and a predetermined temperature T* is used to float above and below this temperature benchmark T0 as the corresponding upper limit of fluctuation T(high) and lower limit of fluctuation T(low), i.e., T(high) = T0 + T*, T(low) = T0 - T*. The specific value of the predetermined temperature T* can be determined according to the temperature accuracy required to meet actual needs, such as setting it to 10% to 15% of the corresponding temperature benchmark T0. The actual temperature of the fluid within the outlet pipeline 10 theoretically varies little over a preset time period. However, due to limitations in the detection accuracy of the temperature sensor 13, fluctuations occur in the detected temperature. Using the aforementioned upper and lower limits of fluctuation as a benchmark, data with large fluctuations are discarded, thereby improving detection accuracy. It is understood that in this embodiment, the range defined by the upper and lower limits of fluctuation is the range of the preset deviation.

[0058] Specifically, based on the real-time temperature data from each temperature sensor, real-time temperature data that fluctuates beyond a preset deviation is removed. This includes removing the non-overlapping portions of the real-time temperature data detected by each temperature sensor within a preset time period and at a preset acquisition frequency.

[0059] Furthermore, in step S2, real-time temperature data with fluctuations exceeding a preset deviation are removed. Specifically, this includes: taking the minimum upper limit and the maximum lower limit of the real-time temperature data fluctuations corresponding to each temperature sensor 13 within a preset time period, and removing real-time temperature data exceeding either the minimum upper limit or the maximum lower limit. That is, based on a comprehensive analysis of each temperature sensor 13, for example, if the upper limit of the real-time temperature data fluctuation for one temperature sensor 13 is T1(high) and the lower limit is T1(low), and the upper limit of the real-time temperature data fluctuation for another temperature sensor 13 is T2(high) and the lower limit is T2(low), and T1(high) > 0.05, then the real-time temperature data fluctuation of the temperature sensor 13 is greater than or equal to the maximum lower limit.

[0060] If T2(high)>T1(low)>T2(low), then T2(high) and T1(low) are used as the benchmarks. Real-time temperature data that exceed the upper limit minimum value T2(high) and lower limit maximum value T1(low) are removed. In other words, the overlapping area of ​​the real-time temperature data waveforms of each temperature sensor 13, i.e. the intersection of the fluctuation range of each temperature sensor 13, is taken for statistical analysis to further improve the detection accuracy.

[0061] Specifically, the non-overlapping portions of real-time temperature data detected by each temperature sensor within a preset time period and at a preset sampling frequency are removed. This includes selecting and removing the non-overlapping portions of real-time temperature data from each temperature sensor. In other words, when three or more temperature sensors are used, the non-overlapping portions of real-time temperature data are removed, and the remaining real-time temperature data is taken as the valid temperature data, with the average value taken as the detected temperature.

[0062] When three or more temperature sensors 13 are set, before removing real-time temperature data with fluctuations exceeding a preset deviation in step S2, if the real-time temperature data corresponding to one temperature sensor 13 deviates from the real-time temperature data corresponding to the other temperature sensors 13 by a greater than a preset value, the real-time temperature data corresponding to that temperature sensor 13 is removed entirely. Specifically, when three or more temperature sensors 13 are set, if the fluctuation range of the real-time temperature data corresponding to one temperature sensor 13 does not intersect with the fluctuation range of the real-time temperature data corresponding to the other temperature sensors 13, the real-time temperature data corresponding to that temperature sensor 13 is removed entirely. Furthermore, if the waveforms of the real-time temperature data from three or more temperature sensors 13 intersect in pairs and do not intersect in other pairs, the three or more sets of data can be analyzed as a whole.

[0063] Alternatively, the real-time temperature data of every pair of temperature sensors 13 at any given time can be compared, and the real-time temperature data corresponding to fluctuations exceeding the preset deviation can be eliminated. For example, if T1>T2>T3, T2-T1 and T3-T2 are both less than the preset deviation, while T3-T1 is greater than the preset deviation, then T3 can be eliminated.

[0064] The above describes a method for obtaining high-precision temperature detection through various temperature sensors 13. In one embodiment, the accuracy of the temperature sensor 13 installed in the outlet pipe 10 of the next-level heating branch is higher than that of the temperature sensor 13 installed in the outlet pipe 10 of the previous-level heating branch. That is, temperature control is performed using a progressively increasing accuracy approach. Specifically, during the temperature control process, the preset deviation can be set in a progressively decreasing manner, resulting in progressively decreasing fluctuations in the detected temperature, thus achieving progressively increasing temperature detection accuracy, and consequently, progressively increasing temperature control accuracy.

[0065] Specifically, the heating branch includes a first heating branch and a second heating branch that are sequentially connected to the second heat exchanger 2.

[0066] In one embodiment, the first heating branch includes a first heater or a first bypass branch. The inlet of the first bypass branch is connected to the first interface of the second heat exchanger 2, and the outlet of the first bypass branch is connected to the second interface of the second heat exchanger 2, specifically as follows: Figure 6 As shown, the first bypass branch is used to mix the heat exchange medium of the first interface of the first heat exchanger 1 with the heat exchange medium of the second interface of the second heat exchanger 2. The first bypass branch is equipped with a regulating valve 3. It can be understood that when the first heating branch is the first bypass branch, it mixes the heat exchange medium of the first interface of the first heat exchanger 1 with the heat exchange medium of the second interface of the second heat exchanger 2. The high-temperature heat exchange medium of the first interface of the first heat exchanger 1 is introduced through the first bypass branch, which can achieve the same effect as the first heater while reducing the system energy consumption.

[0067] Furthermore, a flow regulating valve 3 is provided in the first bypass branch. Since the temperature of the heat exchange medium at the first port of the first heat exchanger differs significantly from that at the second port of the second heat exchanger (i.e., the temperature of the heat exchange medium at the first port of the first heat exchanger is relatively higher), by setting the flow regulating valve 3 as an adjustable flow regulating valve, the flow rate of the first bypass branch can be reduced. For example, the flow rate of the medium in the first bypass branch can be (0.1-10)% of the flow rate of the heat exchange medium at the second port of the second heat exchanger 2. In this way, the smaller flow rate of the heat exchange medium can be slowly mixed with the heat exchange medium at the second port of the second heat exchanger 2, thereby improving the temperature accuracy of the heat exchange medium. Specifically, the first bypass branch can adjust the temperature accuracy of the heat exchange medium to within ±0.3℃, and optimally, it can adjust the temperature accuracy of the heat exchange medium to within ±0.1℃.

[0068] In one embodiment, the second heating branch includes a second heater or a second bypass branch, the inlet of the second bypass branch is connected to the inlet of the first bypass branch, and the outlet of the second bypass branch is connected to the outlet of the first heating branch, specifically as follows: Figure 8 As shown, the second bypass branch is used to mix the heat exchange medium at the inlet of the first bypass branch with the heat exchange medium at the outlet of the first heating branch. Another regulating valve 3 is also provided in the second bypass branch. It can be understood that when the second heating branch is the second bypass branch, it mixes the heat exchange medium at the inlet of the first bypass branch with the heat exchange medium at the outlet of the first heating branch. The high-temperature heat exchange medium introduced into the inlet of the first bypass branch through the second bypass branch can achieve the same effect as the second heater of the second heating branch, while reducing the system energy consumption.

[0069] Furthermore, another flow regulating valve 3 is provided in the second bypass branch. Since the heat exchange medium at the inlet of the first bypass branch is the same as the heat exchange medium at the first interface of the first heat exchanger, and the temperature of the heat exchange medium at the first interface of the first heat exchanger differs significantly from the temperature of the heat exchange medium at the outlet of the first heating branch (i.e., the temperature of the heat exchange medium at the first interface of the first heat exchanger is relatively high), by setting the other flow regulating valve 3 as an adjustable flow regulating valve, the flow rate of the second bypass branch can be reduced. For example, the flow rate of the medium in the second bypass branch can be (0.1-10)% of the flow rate of the heat exchange medium in the first bypass branch. In this way, the smaller flow rate of the heat exchange medium can slowly mix with the heat exchange medium at the outlet of the first heating branch, thereby further improving the temperature accuracy of the heat exchange medium. Specifically, the second bypass branch can adjust the temperature accuracy of the heat exchange medium to within ±0.1℃, and optimally, it can adjust the temperature accuracy of the heat exchange medium to within ±0.03℃.

[0070] The temperature detection device includes a first temperature detection device and a second temperature detection device corresponding to the first heating branch and the second heating branch. The detection accuracy of the second temperature detection device installed on the outlet pipe of the second heating branch is higher than that of the first temperature detection device installed on the outlet pipe of the first heating branch.

[0071] Optionally, to achieve high-precision temperature control, the accuracy of the first temperature detection device is within ±0.3℃, and the accuracy of the second temperature detection device is within ±0.1℃, thus matching the accuracy of each temperature detection device with the temperature control accuracy of the system. Specifically, to ensure the accuracy of the first temperature detection device is within ±0.3℃, the accuracy of at least two temperature sensors used can be within ±1.0℃; similarly, to ensure the accuracy of the second temperature detection device is within ±0.1℃, the accuracy of at least two temperature sensors used can be within ±0.3℃. Higher accuracy of the temperature sensors results in higher accuracy of the corresponding temperature detection device.

[0072] Please see Figure 2 In this embodiment, only one heating branch is provided between the second interface of the second heat exchanger 2 and the second interface of the first heat exchanger 1, and the heating branch includes a heater 6.

[0073] Please see Figure 6In this embodiment, only one heating branch is provided between the second port of the second heat exchanger 2 and the second port of the first heat exchanger 1, and this heating branch is a bypass branch. The inlet A of the bypass branch is connected to the first port of the first heat exchanger 1, and the outlet B of the bypass branch is connected to the second port of the second heat exchanger 2, so that the heat exchange medium of the bypass branch mixes with the heat exchange medium of the second port of the second heat exchanger 2 and flows into the second port of the first heat exchanger 1. Through the bypass branch, the high-temperature heat exchange medium of the first port of the first heat exchanger 1 is transported to the first port of the second heat exchanger 2. The flow rate of the bypass branch is usually small to allow for high-precision temperature fine-tuning. The adjusted heat exchange medium is then transported to the second port of the first heat exchanger 1. After the first heat exchanger 1 absorbs heat from the device or environment that needs cooling, the high-temperature heat exchange medium flows out from the first port to form a circulation loop, fully utilizing the heat wasted by the high-temperature heat exchange medium, reducing the overall system loss, and contributing to energy conservation.

[0074] In some embodiments, at least two heating branches are provided between the second interface of the second heat exchanger 2 and the second interface of the first heat exchanger 1, namely, a first heating branch and a second heating branch. High-precision temperature regulation is achieved through multi-stage series heating branches, which progressively compensates for the temperature of the heat exchange medium at the second interface of the second heat exchanger 2, effectively improving temperature accuracy. High-precision regulation ensures that the high-precision temperature control system meets the requirements for high-precision temperature control and cooling. It should be noted that high-precision temperature control refers to a temperature control accuracy deviation within ±0.1℃; for example, T±0.01℃, T±0.001℃, etc. When a bypass branch is used, the heat exchange medium at the first interface of the first heat exchanger 1 is introduced into the outlet of the previous stage heating branch or the heat exchange medium at the second interface of the second heat exchanger 2. This allows the higher-temperature heat exchange medium at the first interface of the first heat exchanger 1 to mix with the heat exchange medium cooled by the second heat exchanger 2 or the heat exchange medium compensated by subsequent heating branches, thereby achieving high-precision temperature fine-tuning.

[0075] like Figure 7 In this configuration, the second interface of the second heat exchanger 2 is sequentially connected to a first heating branch and a second heating branch, both of which include a heater 6. Specifically, the second interface of the second heat exchanger 2 is connected to the inlet of the heater 6 (i.e., the first heater) of the first heating branch, and the outlet of the heater 6 of the first heating branch is connected to the inlet of the heater 6 (i.e., the second heater) of the next heating branch. The outlet of the heater 6 of the final heating branch is connected to the second interface of the first heat exchanger 1. The heater 6 of the first heating branch provides initial temperature regulation of the heat exchange medium cooled by the second heat exchanger 2, and further heating by the staged heaters 6 achieves higher precision temperature regulation, thus realizing high-precision temperature control.

[0076] like Figure 8 In the second heat exchanger 2, the second interface is sequentially connected to a first heating branch and a second heating branch, and both the first heating branch and the second heating branch include bypass branches. For example... Figure 9 In the second heat exchanger 2, the second interface is connected in series with the first heating branch and the second heating branch, and the first heating branch and the second heating branch respectively include the heater 6 and the bypass branch.

[0077] Specifically, when the first heating branch is a bypass branch, its inlet is connected to the first interface of the first heat exchanger 1; when a non-first-stage heating branch is a bypass branch, its inlet is connected to the first interface of the first heat exchanger 1 or the outlet of the regulating valve 3 of the previous-stage bypass branch; when the final-stage heating branch is a bypass branch, its outlet is connected to the second interface of the first heat exchanger 1; when a non-final-stage heating branch is a bypass branch, its outlet is connected to the outlet of the next-stage bypass branch or the inlet of the heater 6. For clarity, the following will use... Figure 8 and Figure 9 The example shown is a two-stage heating circuit. Figure 8 Both intermediate and secondary heating branches use bypass branches. Figure 9 The first-stage heating branch uses a bypass branch, and the second-stage heating branch uses heater 6.

[0078] Please see Figure 8 Both the first and second heating branches are bypass branches, with the second bypass branch being the final bypass branch. The inlet A1 of the first bypass branch is connected to the first interface of the first heat exchanger 1, and the outlet B1 of the first bypass branch is connected to the second interface of the second heat exchanger 2, both converging at the outlet B2 of the second bypass branch. This allows the heat exchange medium from the first bypass branch to mix with the heat exchange medium from the second interface of the second heat exchanger 2, and then with the heat exchange medium from the second bypass branch. A regulating valve 3 is installed in the first bypass branch to regulate the flow rate at the outlet B1. The inlet A2 of the second bypass branch is connected to the outlet of the regulating valve 3 of the first bypass branch, or to the first interface of the first heat exchanger 1. In other words, the heat recovery of the multi-stage series branches can be directly diverted from the main circuit or diverted between stages, thereby introducing a higher-temperature heat exchange medium into the heat exchange medium after mixing with the second interface of the second heat exchanger 2 in the first bypass branch, allowing for further high-precision temperature regulation. The second bypass branch is equipped with a regulating valve 3 to adjust the flow rate at the outlet B1 of the second bypass branch. In this embodiment, the first bypass branch achieves initial temperature regulation of the heat exchange medium cooled by the second heat exchanger 2, and the second-stage bypass branch achieves higher-precision temperature regulation, thereby realizing high-precision temperature control. Furthermore, both the first and second stages utilize bypass branches for temperature compensation, fully utilizing the heat of the high-temperature heat exchange medium and reducing overall system losses.

[0079] Please see Figure 9 The first heating branch is a bypass branch, while the second heating branch uses heater 6. The inlet A1 of the first bypass branch is connected to the first interface of the first heat exchanger 1, and the outlet B1 of the first bypass branch is connected to the second interface of the second heat exchanger 2, both connecting to the inlet of the second heating branch, i.e., the inlet of heater 6. This allows the heat exchange medium from the first bypass branch to mix with the heat exchange medium from the second interface of the second heat exchanger 2 before further heating by heater 6. A regulating valve 3 is installed in the first bypass branch to regulate the flow rate at the outlet B1. The outlet of the second heating branch, i.e., the outlet of heater 6, is connected to the second interface of the first heat exchanger 1.

[0080] In the case of heating branches with three or more stages, the inlet of the intermediate stage bypass branch is connected to the first interface of the first heat exchanger 1 or the outlet of the regulating valve 3 of the previous stage bypass branch, and the outlet of the intermediate stage bypass branch is connected to the outlet of the next stage bypass branch or the inlet of the heater 6.

[0081] In one embodiment, the bypass branch includes a flow sensor connected to the outlet of the regulating valve 3. The flow sensor provides feedback on the flow rate of the bypass branch, enabling precise control of the flow rate in the bypass branch.

[0082] In one embodiment, a circulating pump 7 and / or a pressure sensor are provided between the inlet of the next heating branch and the outlet of the previous heating branch. The circulating pump 7 provides power for the flow of the heat exchange medium in the system, ensuring that the heat exchange medium flowing out of the outlet of the previous heating branch can enter the next heating branch.

[0083] In one embodiment, the high-precision temperature control system further includes a mixer 4 that cooperates with a bypass branch. The outlet of the bypass branch and the outlet of the previous heating branch are respectively connected to the mixer for mixing, or the outlet of the bypass branch and the second interface of the second heat exchanger 2 are respectively connected to the mixer for mixing. Specifically, when the first heating branch is a first bypass branch, the first inlet of the mixer 4 corresponding to the first bypass branch is connected to the outlet B1 of the first bypass branch, the second inlet is connected to the second interface of the second heat exchanger 2, and the outlet of the mixer 4 is connected to the outlet of the next bypass branch or the inlet of the heater 6, such as... Figure 8 As shown, the outlet of mixer 4 corresponding to the first bypass branch is connected to the outlet of the next-stage bypass branch; as... Figure 9As shown, the outlet of mixer 4 corresponding to the first bypass branch is connected to the inlet of heater 6 of the next heating branch. When the final heating branch is a bypass branch, the first inlet of mixer 4 corresponding to the final bypass branch is connected to the outlet of the final bypass branch, the second inlet is connected to the outlet of the previous heating branch, and the outlet of mixer 4 is connected to the second interface of the first heat exchanger 1. For mixer 4 corresponding to intermediate bypass branches, the first inlet is connected to the outlet of the corresponding bypass branch, the second inlet is connected to the outlet of the previous heating branch, and the outlet of mixer 4 is connected to the outlet of the next bypass branch or the inlet of heater 6. By setting mixer 4, the temperature is accelerated to achieve uniform mixing, improving the efficiency and accuracy of the overall high-precision temperature control system. In other embodiments, mixer 4 may not be set, such as the outlet of the final bypass branch and the outlet of the previous heating branch being connected to the second interface of the first heat exchanger 1 through an inlet manifold, and mixing taking place within the manifold. Specifically, when a mixer 4 is provided, the outlet pipe 10 mentioned above can be the outlet pipe of the mixer 4, and at least two temperature sensors 13 are provided on the same radial section to detect the temperature of the outlet of the mixer 4.

[0084] In one embodiment, the mixer 4 is provided with at least one baffle member 41, and there is a gap between the baffle member 41 and the inner wall of the mixer 4. That is, the baffle member 41 is in a semi-closed state. By setting the baffle member 41, the fluid in the mixer 4 is guided and the flow path in the mixer 4 is extended, so that the mixing is more uniform. Specifically, the baffle member 41 can be a partition.

[0085] In one embodiment, the outlet of the mixer 4 is also provided with a collection box 8 for storing the heat exchange medium. When multiple heating branches are provided, the collection box 8 can be installed between the inlet of the next heating branch and the outlet of the mixer 4 corresponding to the previous heating branch. The collection box 8 provides a larger buffer space for the heat exchange medium, allowing for better mixing and more uniform temperature distribution, thereby further improving the accuracy and stability of the temperature control cooling system.

[0086] In one embodiment, a heat buffer 5 is also included. When a mixer 4 is provided, the heat buffer 5 is connected between the second port of the first heat exchanger 1 and the outlet of the mixer 4 corresponding to the final heating branch. When the mixer 4 is not provided, the heat buffer 5 is connected between the second port of the first heat exchanger 1 and the outlet of the final heating branch. By setting the heat buffer 5, temperature stability is adjusted. After high-precision temperature fine-tuning through the heating branch, the temperature is further stabilized, and a temperature-stable heat exchange medium is provided to the second port of the first heat exchanger 1, achieving precise control.

[0087] In one embodiment, a third temperature detection device is connected to the second port of the second heat exchanger 2. This third temperature detection device is used to detect the temperature of the heat exchange medium flowing out of the second port of the second heat exchanger 2. If the first heating branch is a bypass branch, this temperature sensor should be located before the point where the first bypass branch connects to the second port of the second heat exchanger 2 to allow mixing. By detecting the temperature of the second port of the second heat exchanger 2, the heating branch can be controlled accordingly based on that temperature.

[0088] The accuracy of the third temperature detection device can be the same as that of the first temperature detection device. It can use a corresponding high-precision temperature sensor, or it can use at least two temperature sensors with relatively lower accuracy, which are the same as those in the first temperature detection device. Its implementation is far from the same as that of the first temperature detection device, which will not be elaborated here.

[0089] In one embodiment, a pressure sensor and / or a temperature sensor are provided at the first interface of the first heat exchanger 1, and a flow sensor may also be provided as needed; a temperature sensor and / or a pressure sensor are provided at the second interface of the first heat exchanger 1. In some embodiments, the high-precision temperature control cooling system can specifically utilize flow control to adjust the opening of the regulating valve 3 in the bypass branch, thereby achieving temperature compensation. In some embodiments, target temperature monitoring can also be used to adjust the opening of the regulating valve 3 or the power of the heater 6 in the bypass circuit. When the load at the terminal changes, the main control logic detects changes in the inlet, outlet, or inlet-outlet temperature difference or flow rate, and adjusts the corresponding flow rate of the regulating valve 3 or the power of the heater 6 to achieve precise control.

[0090] In one embodiment, the second heat exchanger 2 is externally connected to at least one of a compressor cooling circuit and a cooling water cooling circuit. The heat exchange medium flowing through the second heat exchanger 2 is cooled by the compressor cooling circuit or the cooling water cooling circuit to a temperature close to that of the outlet. Using a compressor cooling circuit or a cooling water cooling circuit has high cooling efficiency. In other embodiments, the second heat exchanger 2 can also be cooled by a fan or the like.

[0091] In one embodiment, the second heat exchanger 2 is only connected to an external cooling water circuit. The second heat exchanger 2 includes a third interface and a fourth interface that are connected to each other. The third interface is the cooling medium outlet, and the fourth interface is the cooling medium inlet. The heat exchange medium inside the second heat exchanger 2 is cooled by the external cooling medium. Specifically, the third interface and the fourth interface can be connected to temperature sensors respectively for detecting the temperature of the cooling medium.

[0092] In one embodiment, the cooling water cooling circuit includes a third heat exchanger, the compressor cooling circuit includes an expansion valve, a bypass valve, and a compressor, and the second heat exchanger 2 includes a third port and a fourth port connected together. The third port is connected to the first port of the third heat exchanger via the expansion valve, and the second port of the third heat exchanger is connected to the fourth port of the second heat exchanger 2 via the compressor. The bypass valve is connected between the first port of the third heat exchanger and the second port of the second heat exchanger 2. The third heat exchanger is externally connected to a cooling medium. The externally connected cooling medium first cools the heat exchange medium inside the third heat exchanger. The initially cooled heat exchange medium is further cooled by the compressor, thereby cooling the heat exchange medium inside the second heat exchanger 2. Specifically, the third heat exchanger includes a third port and a fourth port connected together. The third port is the cooling medium outlet, and the fourth port is the cooling medium inlet. The externally connected cooling medium cools the heat exchange medium inside the third heat exchanger. Specifically, the third port and the fourth port of the third heat exchanger can be connected to temperature sensors for cooling medium temperature detection. The expansion valve and bypass valve in the compressor cooling circuit can be used to prevent the compressor from overheating and to allow hot gas to bypass.

[0093] In other embodiments, a cooling water cooling circuit may not be provided; instead, the heat exchange medium in the second heat exchanger 2 may be cooled solely by a compressor cooling circuit. Specifically, depending on load changes, the cooling water cooling circuit is preferred when it can meet the load requirements. When the cooling water cooling circuit does not meet the load requirements, a compressor cooling circuit may be used alone, or a combination of a compressor cooling circuit and a cooling water cooling circuit may be used, with the compressor cooling circuit supplementing the cooling capacity or temperature difference.

[0094] 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.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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 high-precision temperature control system, comprising a first heat exchanger (1) and a second heat exchanger (2), wherein a first interface of the first heat exchanger (1) is connected to a first interface of the second heat exchanger (2); characterized in that, At least one heating branch is provided between the second interface of the second heat exchanger (2) and the second interface of the first heat exchanger (1). The outlet pipe of the heating branch is provided with a temperature detection device for detecting the fluid temperature. The temperature detection device includes at least two temperature sensors (13). The outlet pipe is provided with a fixing part (11) corresponding to each of the temperature sensors (13). Each temperature sensor (13) is fixed on the corresponding fixing part (11), and the probe of each temperature sensor (13) is located on the same radial section of the outlet pipe. The heating branch includes a first heating branch and a second heating branch that are sequentially connected to the second heat exchanger (2); The first heating branch includes a first bypass branch, the inlet of which is connected to the first interface of the second heat exchanger (2); The second heating branch includes a second bypass branch. The inlet of the second bypass branch is connected to the outlet of the regulating valve in the first bypass branch, or to the first interface of the first heat exchanger. The outlet of the first bypass branch is connected to the second interface of the second heat exchanger and both are connected to the outlet of the second bypass branch.

2. The high-precision temperature control system according to claim 1, characterized in that, The fixing part (11) is an installation pipe provided on the outer wall of the outlet pipe (10), and the outlet pipe (10) has a through hole (12). The temperature sensor (13) passes through the through hole (12) and is sealed and fixed with the through hole (12). The probe of the temperature sensor (13) is located in the cavity of the outlet pipe (10).

3. The high-precision temperature control system according to claim 2, characterized in that, The mounting pipe is radially inclined relative to the outlet pipe (10).

4. The high-precision temperature control system according to claim 3, characterized in that, The projection of the inclination direction of the outer end of the mounting pipe to the end connected to the outlet pipe (10) onto the axial direction of the outlet pipe (10) is consistent with the fluid flow direction within the outlet pipe (10).

5. The high-precision temperature control system according to claim 1, characterized in that, The temperature detection device includes a corresponding first temperature detection device and a second temperature detection device. The detection accuracy of the second temperature detection device installed on the outlet pipe of the second heating branch is higher than that of the first temperature detection device installed on the outlet pipe of the first heating branch.

6. The high-precision temperature control system according to claim 5, characterized in that, The temperature detection device further includes a third temperature detection device, which is located at the second interface of the second heat exchanger (2).

7. The high-precision temperature control system according to claim 6, characterized in that, The accuracy of the first temperature detection device and the third temperature detection device is within ±0.3℃, and the accuracy of the second temperature detection device is within ±0.1℃.

8. The high-precision temperature control system according to claim 1, characterized in that, It also includes a first mixer and a second mixer. The inlet of the first mixer is connected to the outlet of the first bypass branch and the second interface of the second heat exchanger (2), respectively. The inlet of the second mixer is connected to the outlet of the first mixer and the outlet of the second bypass branch. The outlet of the second mixer is connected to the second interface of the first heat exchanger (1). At least one baffle component is provided in both the first mixer and the second mixer. There is a gap between the baffle component and the inner wall of the first mixer or the second mixer. The outlet of the first mixer (4) is also provided with a collection box (8) for storing the heat exchange medium. A circulation pump (7) and / or a pressure sensor are provided between the inlet of the first heating branch and the outlet of the second heating branch.

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