Vibration table temperature control system and vibration test table thereof

Abstract

The embodiment of the invention discloses a vibration table temperature control system and a vibration test table thereof. Comprising an internal circulation cooling unit, an external circulation cooling unit, a heat exchanger and a cooling coil. The internal circulation cooling unit comprises a first closed circulation loop; the internal circulation cooling unit comprises a cooling part, and the cooling part is connected in series in the first closed circulation loop and is in thermal coupling connection with the cooling coil; the cooling part is configured to adjust the temperature of the cooling coil through heat exchange between the first cooling medium and the cooling coil; the outer circulation cooling unit comprises a second closed circulation loop; the heat exchanger is configured to adjust a temperature of the first cooling medium through heat exchange between the primary side and the secondary side. According to the embodiment of the invention, the problem that the cooling pipeline of the vibration table temperature control system is blocked due to deterioration of water quality is effectively avoided, the maintenance cost is reduced, the operation temperature of the vibration test table is always ensured to be within a reliable temperature range, and the stable operation of the vibration test table is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems, and in particular, to a temperature control system for a vibration table and its vibration test bench. Background Art

[0002] As a key device capable of simulating various vibration environments and conducting vibration tests on products, components, and materials, during operation, the cooling coil and the power coil of a vibration test bench will pass through a large current, thereby generating a large amount of heat. Therefore, during the operation of the vibration test bench, cooling and temperature reduction of its main heat-generating component, that is, the cooling coil, are crucial for ensuring the normal operation of the device.

[0003] In the prior art, a cooling method of connecting an internal cooling unit in series with an external cooling tower or chiller is usually adopted. Specifically, the internal cooling unit conveys pure water to the cooling coil to achieve their cooling; while the external cooling tower or chiller uses tap water to cool the pure water in the internal cooling unit.

[0004] However, the prior art solutions have obvious drawbacks. After long-term operation, due to the long-term open environment of the external cooling tower or chiller, external impurities such as dust, leaves, and microorganisms continuously invade, resulting in the continuous deterioration of the water quality in the external cooling unit, and further causing pipeline blockage. Once this situation occurs, the cooling coil cannot be effectively cooled, and may ultimately be damaged due to overheating. Summary of the Invention

[0005] The present invention provides a temperature control system for a vibration table and its vibration test bench. By setting up an internal circulation cooling unit, an external circulation cooling unit, and a heat exchanger, a double-closed circulation loop is formed, effectively avoiding the pipeline blockage problem caused by water quality deterioration, reducing the maintenance cost, and always ensuring that the operating temperature of the vibration test bench is within a reliable temperature range, thereby ensuring the stable operation of the vibration test bench.

[0006] An embodiment of the present invention provides a temperature control system for a vibration table, including an internal circulation cooling unit, an external circulation cooling unit, a heat exchanger, and a cooling coil;

[0007] The internal circulation cooling unit includes a first closed circulation loop, and a first cooling medium circulates in the first closed circulation loop;

[0008] The internal circulation cooling unit includes a cooling part, the cooling part is connected in series in the first closed circulation loop and is thermally coupled to the cooling coil; the cooling part is configured to adjust the temperature of the cooling coil through the heat exchange between the first cooling medium and the cooling coil;

[0009] The external circulation cooling unit includes a second closed circulation loop, and a second cooling medium circulates in the second closed circulation loop;

[0010] The primary side of the heat exchanger is connected in series to the first closed circulation loop of the internal circulation cooling unit, and the secondary side is connected in series to the second closed circulation loop of the external circulation cooling unit. The heat exchanger is configured to adjust the temperature of the first cooling medium through heat exchange between the primary side and the secondary side.

[0011] Optionally, an external circulation water tank, an external circulation water pump, and a refrigeration device are sequentially arranged on the second closed circulation loop; the refrigeration device is used to cool the second cooling medium in the external circulation cooling unit.

[0012] Optionally, the refrigeration device includes an evaporator, a compressor, a condenser, and a throttler connected in sequence; a third cooling medium circulates in the circulation channel of the refrigeration device;

[0013] The evaporator is arranged inside the external circulation water tank and is used to absorb heat from the external circulation water tank through the low-temperature and low-pressure third cooling medium, changing the third cooling medium into a low-pressure gaseous state;

[0014] The compressor is used to compress the low-pressure gaseous third cooling medium, changing the third cooling medium into a high-temperature and high-pressure state;

[0015] The condenser is used to release the heat of the high-temperature and high-pressure third cooling medium, changing the third cooling medium into a low-temperature and high-pressure state;

[0016] The throttler is used to throttle and expand the low-temperature and high-pressure third cooling medium to the evaporation pressure, so that the third cooling medium returns to the low-temperature and low-pressure state and re-enters the evaporator to participate in the heat cycle.

[0017] Optionally, the refrigeration device further includes a dryer filter, which is connected in series between the compressor and the throttler. The dryer filter is used to remove moisture from the third cooling medium and filter impurities.

[0018] Optionally, the external circulation cooling unit further includes a heating device. The heating device is heat-exchange connected to the external circulation water tank, and the heating device is used to heat the second cooling medium in the external circulation water tank.

[0019] Optionally, the heating device further includes a dew point detector and a temperature control unit;

[0020] The dew point detector is arranged in the environmental space where the cooling coil is located and is used to obtain the dew point temperature of the environmental space;

[0021] The internal circulation cooling unit further includes:

[0022] An internal circulation water tank, which is connected in series to the first closed circulation loop;

[0023] A temperature sensor, which is arranged inside the internal circulation water tank and is used to obtain the temperature of the first cooling medium;

[0024] The temperature control unit is configured to: when the temperature sensor detects that the temperature of the cooling medium in the internal circulation water tank is less than the first threshold temperature T1, start the heating device to heat the second cooling medium in the external circulation water tank;

[0025] When it is detected that the temperature of the first cooling medium is higher than the second threshold temperature T2, stop the heating operation of the heating device;

[0026] Wherein, T1 = T0 + △T1, T2 = T0 + △T2, and △T1 ≤ △T2 is satisfied, and △T1 and △T2 are preset temperature margin values.

[0027] Optionally, the temperature control unit is further configured to: when the heating device is in a working state, adjust the set temperature parameter of the refrigeration device so that its refrigeration target temperature increases in a preset gradient until it reaches the temperature balance point matching the current heating power.

[0028] Optionally, the refrigeration device further includes:

[0029] A bypass pipeline, which is arranged in parallel at both ends of the evaporator to form a medium shunt channel;

[0030] A flow regulating valve, which is arranged on the bypass pipeline, and the flow regulating valve is configured to adjust the medium flow ratio flowing through the evaporator and the bypass pipeline;

[0031] The temperature control unit is further configured to: when the heating device is started, control the flow regulating valve to reduce the medium flow ratio flowing through the evaporator.

[0032] Optionally, the first closed circulation loop includes a cooling part, an internal circulation water pump, an internal circulation water tank, and a purification device arranged in sequence;

[0033] The purification device is used to remove impurities in the first cooling medium.

[0034] Optionally, the purification device includes a filter and / or a purifier;

[0035] The filter is arranged in series on the pipeline between the internal circulation water pump and the cooling part, and is used to filter solid impurities in the first cooling medium;

[0036] The purifier is arranged in series on the pipeline between the cooling part and the internal circulation water tank, and is used to remove ions dissolved in the first cooling medium during the internal circulation process.

[0037] Optionally, a pre-filter is arranged on the pipeline between the external circulation water tank and the external circulation water pump, and the pre-filter is used to filter solid impurities in the second cooling medium.

[0038] According to another aspect of the present invention, a vibration test bench is provided, including any vibration table temperature control system in the first aspect.

[0039] An embodiment of the present invention provides a temperature control system for a vibration table, which includes an internal circulation cooling unit, an external circulation cooling unit, a heat exchanger, and a cooling coil. The internal circulation cooling unit includes a first closed circulation loop, in which a first cooling medium circulates, and the first cooling medium circulates internally in the first closed circulation loop. The cooling part is connected in series to the first closed circulation loop and is thermally coupled to the cooling coil; the cooling part is configured to adjust the temperature of the cooling coil through the heat exchange between the first cooling medium and the cooling coil, so as to accurately adjust the temperature of the cooling coil, ensure that the cooling coil operates within a suitable temperature range, and avoid affecting its performance or causing damage due to overheating. The external circulation cooling unit includes a second closed circulation loop, in which a second cooling medium circulates. The primary side of the heat exchanger is connected in series to the first closed circulation loop of the internal circulation cooling unit, and the secondary side is connected in series to the second closed circulation loop of the external circulation cooling unit. The heat exchanger is configured to adjust the temperature of the first cooling medium through the heat exchange between the primary side and the secondary side. When the temperature of the internal circulation medium exceeds the set threshold, the external circulation cooling unit exports the heat accumulated in the internal circulation through the heat exchanger. By setting the internal and external double closed circulation to work together, the internal circulation directly cools the coil through the closed medium, and the external circulation exports heat through the heat exchanger to realize medium regeneration and isolate external pollution. This fundamentally eliminates the intrusion of external pollutants such as dust and microorganisms caused by the open refrigeration cycle, avoids problems such as pipeline scaling and flow channel blockage caused by water quality deterioration common in open systems, reduces the maintenance cost, always ensures that the operating temperature of the vibration test table is within a reliable temperature range, and ensures the stable operation of the vibration test table. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of a temperature control system for a vibration table provided by an embodiment of the present invention.

[0041] In the figure: 100, internal circulation cooling unit; 110, cooling part; 120, internal circulation water pump; 130, internal circulation water tank; 140, purification device; 141, filter; 142, temperature sensor; 200, external circulation cooling unit; 210, external circulation water tank; 220, external circulation water pump; 230, refrigeration device; 231, evaporator; 232, compressor; 233, condenser; 234, throttle; 235, dryer filter; 236, flow regulating valve; 240, heating device; 241, dew point detector; 250, pre-filter; 300, heat exchanger; 400, cooling coil. Detailed Embodiments

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the accompanying drawings.

[0043] Figure 1 The following is a schematic structural diagram of a temperature control system for a vibration table provided by an embodiment of the present invention. As Figure 1 shown, the temperature control system for the vibration table includes an internal circulation cooling unit 100, an external circulation cooling unit 200, a heat exchanger 300, and a cooling coil 400.

[0044] The internal circulation cooling unit 100 includes a first closed circulation loop, and a first cooling medium circulates in the first closed circulation loop; the first cooling medium circulates internally in the first closed circulation loop, avoiding direct contact with the external environment and preventing the first cooling medium from being contaminated, thereby ensuring the stability of its cooling performance.

[0045] Please continue to refer to Figure 1 , the cooling medium in the above-mentioned first closed circulation loop is pure water (conductivity ≤ 5 μS / cm). Using pure water as the cooling medium can prevent electrical conduction between the temperature control system of the vibration table and the cooled cooling coil 400, improving the safety of use, and the cost of pure water is low and it is easy to obtain.

[0046] The internal circulation cooling unit 100 includes a cooling part 110, the cooling part 110 is connected in series to the first closed circulation loop and is thermally coupled to the cooling coil 400; the cooling part 110 is configured to adjust the temperature of the cooling coil 400 through the heat exchange between the first cooling medium and the cooling coil 400, realizing precise adjustment of the temperature of the cooling coil 400, ensuring that the cooling coil 400 operates within a suitable temperature range, and avoiding affecting its performance or causing damage due to overheating. Specifically, the cooling coil includes a moving coil and an exciting coil. The moving coil is under the action of the Lorentz force in the magnetic field environment formed by the exciting coil, generating a reciprocating motion, thereby driving the vibration table tabletop to simulate a vibration environment. Both the moving coil and the exciting coil will generate a large amount of heat due to resistance loss when energized.

[0047] The external circulation cooling unit 200 includes a second closed circulation loop, in which a second cooling medium circulates. The primary side of the heat exchanger 300 is connected in series to the first closed circulation loop of the internal circulation cooling unit 100, and the secondary side is connected in series to the second closed circulation loop of the external circulation cooling unit 200. The heat exchanger 300 is configured to adjust the temperature of the first cooling medium through heat exchange between the primary side and the secondary side. In the second closed circulation loop, the second cooling medium absorbs the heat of the first cooling medium from the internal circulation cooling unit 100 through the heat exchanger 300, so that the first cooling medium can be restored to an appropriate temperature to continue cooling the cooling coil 400, ensuring the continuous and stable operation of the system.

[0048] Exemplarily, the heat exchanger 300 can be a wall-type heat exchanger (plate heat exchanger, double-pipe heat exchanger, shell-and-tube heat exchanger). As Figure 1 shown, in this embodiment, the C port (the first closed circulation water inlet) and the D port (the first closed circulation water outlet) of the plate heat exchanger 300 are connected as the primary side; the A port (the second closed circulation water inlet) and the B port (the second closed circulation water outlet) of the plate heat exchanger 300 are connected as the secondary side, and the secondary side absorbs heat from the primary side.

[0049] In the embodiment of the present invention, by setting the internal and external double closed circulation to work together, the internal circulation directly cools the coil through a closed medium, and the external circulation uses a heat exchanger to export heat to realize medium regeneration and isolate external pollution, fundamentally eliminating the intrusion of external pollutants such as dust and microorganisms caused by an open refrigeration cycle, avoiding problems such as pipeline scaling and flow channel blockage caused by common water quality deterioration in an open system, reducing the maintenance cost, always ensuring that the operating temperature of the vibration test bench is within a reliable temperature range, and ensuring the stable operation of the vibration test bench.

[0050] Optionally, an external circulation water tank 210, an external circulation water pump 220, and a refrigeration device 230 are sequentially arranged on the second closed circulation loop; the refrigeration device 230 is used to cool the second cooling medium in the external circulation cooling unit 200. Specifically, in this embodiment, the external circulation water tank 210 is a 275L stainless steel water tank; the external circulation water pump 220 is a horizontal stainless steel multi-stage centrifugal pump, with the model CHL8-50LSWSC; the refrigeration device 230 is a compression refrigeration machine; the second cooling medium is pure water.

[0051] Optionally, the refrigeration device 230 includes an evaporator 231, a compressor 232, a condenser 233, and a throttling device 234 connected in sequence; a third cooling medium circulates in the circulation channel of the refrigeration device 230. The third cooling medium is a pure refrigerant, such as chlorodifluoromethane, tetrafluoroethane, etc.

[0052] The evaporator 231 is disposed within the external circulation water tank 210 and is used to absorb heat from the external circulation water tank 210 through a low-temperature and low-pressure third cooling medium, changing the third cooling medium into a low-pressure gaseous state. Specifically, in this embodiment, the evaporator 231 is formed by coiling a stainless steel pipe with a length of 40 m and an inner diameter of 16 mm.

[0053] The compressor 232 is used to compress the low-pressure gaseous third cooling medium, changing the third cooling medium into a high-temperature and high-pressure state. Specifically, the compressor 232 selects a Copeland scroll compressor, and the specific model is VR125KS-TFP-522.

[0054] The condenser 233 is used to release the heat of the high-temperature and high-pressure third cooling medium, changing the third cooling medium into a low-temperature and high-pressure state. Specifically, the condenser 233 selects a 180-square-foot air-cooled condenser. The air-cooled condenser includes an external fin condenser and a fan, and the above-mentioned fan is disposed on the fins of the above-mentioned external fin condenser. The external fin condenser is disposed outdoors to export the heat of the heat-exchanged cooling medium to the outdoors. The external fin radiator has strong heat dissipation ability and can quickly cool and dissipate the heat of the heat-exchanged cooling medium, improving the cooling effect of the cooling system of this vibration test bench.

[0055] The throttler 234 is used to throttle and expand the low-temperature and high-pressure third cooling medium to the evaporation pressure, so that the third cooling medium returns to the low-temperature and low-pressure state and re-enters the evaporator 231 to participate in the thermal cycle. Specifically, the throttler 234 selects an expansion valve, and the specific model is HFES10HC.

[0056] Optionally, the refrigeration device 230 further includes a dryer filter 235, which is connected in series between the compressor 232 and the throttler 234. The dryer filter 235 is used to remove moisture in the third cooling medium and filter impurities. Specifically, the dryer filter 235 selects a liquid line dryer filter, and the specific model is DML165S.

[0057] Optionally, the external circulation cooling unit 200 further includes a heating device 240. The heating device 240 is heat-exchange connected to the external circulation water tank 210, and the heating device 240 is used to heat the second cooling medium in the external circulation water tank 210.

[0058] Specifically, in this embodiment, the heating device 240 selects two 9Kw heating tubes, which are installed inside the external circulation water tank 210 to balance the cold quantity as a heat source to maintain the temperature of the second cooling medium.

[0059] Optionally, the heating device 240 further includes a dew point detector 241 and a temperature control unit;

[0060] The dew point detector 241 is disposed in the environmental space where the cooling coil is located and is used to obtain the dew point temperature of the environmental space;

[0061] The internal circulation cooling unit 100 further includes:

[0062] An internal circulation water tank 130, which is connected in series in the first closed circulation loop; specifically, a 100L stainless steel water tank is selected in this embodiment.

[0063] A temperature sensor, which is arranged inside the internal circulation water tank 130 and is used to obtain the temperature of the first cooling medium;

[0064] The temperature control unit is configured such that when the temperature sensor detects that the temperature of the cooling medium in the internal circulation water tank 130 is less than the first threshold temperature T1, the heating device 240 is started to heat the second cooling medium in the external circulation water tank 210;

[0065] When it is detected that the temperature of the first cooling medium is higher than the second threshold temperature T2, the heating operation of the heating device 240 is stopped;

[0066] Wherein, T1 = T0 + △T1, T2 = T0 + △T2, and △T1 ≤ △T2 are satisfied. △T1 and △T2 are preset temperature margin values. The ambient dew point temperature can be understood as the temperature at which water vapor in the air reaches saturation under the condition that the water vapor content and air pressure in the environment do not change. If the temperature continues to drop, the water vapor in the saturated air will condense into water droplets, and the phenomenon of dew condensation will occur. At this time, the temperature is the dew point temperature; the preset temperature margin value can be understood as the temperature advance used to ensure that the temperature of the cooling medium is controlled within a safe range and to avoid the occurrence of dew condensation; the first threshold temperature T1 can be understood as the temperature at which the heating device 240 starts to work to heat the second cooling medium; the second threshold temperature T2 can be understood as the temperature at which the heating device stops working and no longer heats the second cooling medium.

[0067] Specifically, when the dew point detector 241 detects the dew point temperature of the environmental space where the cooling coil is located, it will transmit this data to the temperature control unit. The temperature sensor monitors the temperature of the first cooling medium in the internal circulation water tank 130 in real time and also feeds back the temperature data to the temperature control unit.

[0068] The temperature control unit calculates the first threshold temperature T1 (dew point temperature + T1) and the second threshold temperature T2 (dew point temperature + T2) based on the received dew point temperature. When the temperature of the first cooling medium is lower than the first threshold temperature T1, it means that the temperature of the cooling medium is too low at this time, and dew condensation may occur on the surface of relevant equipment due to the temperature being lower than the ambient dew point temperature. To avoid this situation, the temperature control unit starts the heating device 240 to heat the second cooling medium in the external circulation water tank 210 connected in series in the external circulation loop.

[0069] By controlling the temperature of the second cooling medium, the temperature difference between the first cooling medium and the second cooling medium is changed, thereby adjusting the cooling efficiency of the second cooling medium for the first cooling medium, and causing the temperature of the first cooling medium to rise slowly. When the temperature sensor detects that the temperature of the first cooling medium is higher than the second threshold temperature T2, it indicates that the temperature of the cooling medium is high enough at this time and dew condensation wind will not occur. At this time, the temperature control unit stops the heating operation of the heating device 240 to achieve the purpose of avoiding dew condensation.

[0070] Exemplarily, when T1 = 1°C and T2 = 2°C, at a certain moment, the dew point detector 241 detects that the dew point temperature of the environment space where the cooling coil is located is 20°C. Then, the first threshold temperature T1 calculated by the temperature control unit is 20 + 1 = 21°C, and the second threshold temperature T2 is also 20 + 2 = 22°C. When the temperature sensor detects that the temperature of the first cooling medium in the internal circulation water tank 130 drops below 21°C, the temperature control unit will start the heating device 240 to heat the second cooling medium in the external circulation water tank 210. As the heating process progresses, the temperature of the second cooling medium rises, and the temperature difference from the first cooling medium gradually decreases, resulting in a decrease in the cooling efficiency of the second cooling medium for the first cooling medium, and the temperature of the first cooling medium begins to rise slowly. When the temperature sensor detects that the temperature of the first cooling medium rises back to 22°C or above, the temperature control unit determines that the temperature of the cooling medium is within the safe range at this time and dew condensation will not occur, and stops the heating operation of the heating device 240. When T2 is greater than T1, it can be avoided that the heating device repeatedly starts and stops near the starting temperature critical value.

[0071] Optionally, the temperature control unit is further configured to: when the heating device 240 is in a working state, adjust the set temperature parameter of the refrigeration device 230 so that its refrigeration target temperature increases according to a preset gradient until it reaches the temperature balance point matching the current heating power.

[0072] Specifically, using the heating device 240 is only a temporary emergency measure to avoid dew condensation. The core goal of the temperature control unit is to ultimately achieve the temperature balance of the system by gradually adjusting the set temperature parameter of the refrigeration device 230, and keep the temperature of the first cooling medium stable in the safe range. During this adjustment process, in order to avoid adverse effects on the system caused by sharp temperature changes, the temperature control unit will adjust the refrigeration target temperature according to the preset gradient based on the current temperature of the first cooling medium and the second threshold temperature T2. For example, the preset gradient can be set to increase the refrigeration target temperature by 1°C every 5 minutes. As the refrigeration target temperature of the refrigeration device 230 gradually increases according to the preset gradient, the heat input by the heating device 240 will also decrease according to the gradient, making the temperature change of the system more stable and avoiding large fluctuations in temperature.

[0073] Optionally, the refrigeration device 230 further includes:

[0074] A bypass pipeline is arranged in parallel at both ends of the evaporator 231 to form a medium shunt channel;

[0075] A flow regulating valve 236 is arranged on the bypass pipeline. The flow regulating valve 236 is configured to regulate the flow ratio of the medium flowing through the evaporator 231 and the bypass pipeline;

[0076] The temperature control unit is further configured to: when the heating device 240 is started, control the flow regulating valve 236 to reduce the flow ratio of the medium flowing through the evaporator 231.

[0077] Specifically, when the heating device 240 is started, the temperature control unit controls the flow regulating valve 236 to open, separating a part of the refrigerant, bypassing the evaporator 231 through the bypass pipeline and directly sending it to the inlet of the compressor 232, and the remaining refrigerant continues to circulate in the original second closed loop, reducing the temperature of the second cooling medium in the external circulation water tank 210 through the evaporator 231, quickly adjusting the working efficiency of the refrigeration device 230, and reducing the refrigeration energy consumption.

[0078] Optionally, the first closed circulation loop sequentially includes a cooling part 110, an internal circulation water pump 120, an internal circulation water tank 130, and a purification device 140;

[0079] In the first closed circulation loop, the first cooling medium is stored in the internal circulation water tank 130, and the internal circulation water pump 120 provides the driving force for the flow, so that it flows to the cooling part 110, exchanges heat with the cooling coil 400 of the vibration test bench in the cooling part 110, and the heat-exchanged first cooling medium dissipates heat through the heat exchanger 300. After being cooled, the first cooling medium flows back into the internal circulation water tank 130 for the next cycle.

[0080] In the first closed circulation loop, a purification device 140 is further included. The purification device is used to purify the first cooling medium in the first closed circulation loop to ensure the purity of the cooling medium, avoid blocking the cooling system, reduce the maintenance frequency and cost, and its purification device covers two aspects of ion purification and particulate purification.

[0081] Optionally, the purification device 140 includes a filter 141 and / or a purifier 142.

[0082] The filter 141 is serially arranged on the pipeline between the internal circulation water pump 120 and the cooling part 110 for filtering solid impurities in the first cooling medium. The filter 141 can filter larger particle impurities that may appear in the cooling medium, ensure the purity of the cooling medium, avoid blocking the cooling system, and further reduce the maintenance frequency and maintenance cost.

[0083] The purifier 142 is serially arranged on the pipeline between the cooling part 110 and the internal circulation water tank 110, and is used to remove the ions incorporated into the first cooling medium during the internal circulation process. The purifier 142 can purify pure water, remove the ions in the pure water, purify the pure water, remove the impurities in the water, so that the water quality meets the requirements. Among them, the ions that can be removed include hardness ions, heavy metal ions, organic ions, etc.

[0084] Exemplarily, the purifier 142 can be a deionized purification column filled with mixed-bed ion exchange resin, such as an 817-type 12-liter purification column. The mixed-bed ion exchange resin is composed of anion exchange resin and cation exchange resin mixed in proportion. The cation exchange resin uses its hydrogen ions to exchange and remove the cations in the water, and the anion exchange resin uses its hydroxide ions to exchange and remove the anions in the water. The hydrogen ions and hydroxide ions exchanged out in the mixed-bed resin combine to form water. The mixed-bed ion exchange resin can be used to deeply remove the trace ions existing in the pure water.

[0085] Optionally, a pre-filter 250 is arranged on the pipeline between the external circulation water tank 210 and the external circulation water pump 220. The pre-filter 250 is used to filter the solid impurities in the second cooling medium. Specifically, during the operation of the entire external circulation cooling unit 200, the second cooling medium (pure water) may be mixed with solid impurities for various reasons. Although the second cooling medium does not require deep purification, once larger particle impurities enter the heat exchanger 300, it may cause the water-cooled plate heat exchanger to be blocked. If the maintenance is not timely, it will lead to a decrease in the cooling capacity of the cooling system, resulting in an increase in the temperature of the coil, and there is still a risk of damage. The pre-filter 250 ensures the stable operation of the second closed circulation loop, and further ensures that the entire external circulation cooling unit 200 can continuously and efficiently provide stable cooling support for the system, maintaining the normal operation of the vibration table temperature control system.

[0086] This embodiment also provides a vibration test bench, and the vibration test includes the vibration table temperature control system in any of the above solutions. The vibration table temperature control system used by this vibration test bench uses the internal circulation cooling unit 100, the external circulation cooling unit 200 and the heat exchanger 300 to form a double closed circulation loop, realizing the circulating cooling of the cooling medium to the cooling coil 400 of the vibration test bench. The cooling medium does not come into contact with the external environment during this process, there is no problem of blocking the cooling system, there is no need for frequent shutdown maintenance, the maintenance cost is reduced, the operating temperature of the vibration test bench is always guaranteed to be within a reliable temperature range, the service life of the vibration test bench is extended, and the use reliability is improved.

[0087] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A vibration table temperature control system, characterized in that: It comprises an internal circulation cooling unit (100), an external circulation cooling unit (200), a heat exchanger (300) and a cooling coil (400); The internal circulation cooling unit (100) comprises a first closed circulation loop, in which a first cooling medium flows; The internal circulation cooling unit (100) comprises a cooling part (110), the cooling part (110) is connected in series in the first closed circulation loop and is thermally coupled to the cooling coil (400); the cooling part (110) is configured to adjust the temperature of the cooling coil (400) through heat exchange between the first cooling medium and the cooling coil (400); The external circulation cooling unit (200) comprises a second closed circulation loop, in which a second cooling medium flows; The primary side of the heat exchanger (300) is connected in series to the first closed circulation loop of the internal circulation cooling unit (100), and the secondary side is connected in series to the second closed circulation loop of the external circulation cooling unit (200). The heat exchanger (300) is configured to adjust the temperature of the first cooling medium through heat exchange between the primary side and the secondary side.

2. The temperature control system according to claim 1, characterized in that: An external circulation water tank (210), an external circulation water pump (220) and a refrigeration device (230) are sequentially arranged on the second closed circulation loop; the refrigeration device (230) is used to cool the second cooling medium in the external circulation cooling unit (200).

3. The temperature control system according to claim 2, characterized in that: The refrigeration device (230) comprises an evaporator (231), a compressor (232), a condenser (233), and a throttle (234) connected in sequence; a third cooling medium flows in a circulation channel of the refrigeration device (230); The evaporator (231) is arranged in the external circulation water tank (210) and is used to absorb heat from the external circulation water tank (210) through the third cooling medium of low temperature and low pressure, and change the third cooling medium into a low-pressure gas state; The compressor (232) is used to compress the third cooling medium in a low-pressure gaseous state to change the third cooling medium into a high-temperature and high-pressure state; The condenser (233) is used to release the heat of the third cooling medium in a high-temperature and high-pressure state, and change the third cooling medium to a low-temperature and high-pressure state; The throttle (234) is used to throttle and expand the third cooling medium in a low-temperature and high-pressure state to an evaporation pressure, so that the third cooling medium is restored to a low-temperature and low-pressure state and re-enters the evaporator (231) to participate in the heat cycle.

4. The temperature control system according to claim 3, characterized in that: The refrigeration device (230) further comprises a drying filter (235) connected in series between the compressor (232) and the throttle (234), wherein the drying filter (235) is used to remove moisture from the third cooling medium and filter impurities.

5. The temperature control system according to claim 2, characterized in that: The external circulation cooling unit (200) further comprises a heating device (240), the heating device (240) being connected to the external circulation water tank (210) for heat exchange, and the heating device (240) being used to heat the second cooling medium in the external circulation water tank (210).

6. The temperature control system according to claim 5, characterized in that: The heating device (240) further includes a dew point detector (241) and a temperature control unit (243); The dew point detector (241) is arranged in the environment space where the cooling coil is located, and is used to obtain the dew point temperature T of the environment space; The internal circulation cooling unit (100) further comprises: An internal circulation water tank (130), the internal circulation water tank (130) being connected in series in the first closed circulation loop; a temperature sensor (160), the temperature sensor (160) being arranged inside the internal circulation water tank (130) and being used to obtain the temperature of the first cooling medium; The temperature control unit (243) is configured to: when the temperature sensor (160) detects that the temperature of the cooling medium in the inner circulation water tank (130) is lower than a first threshold temperature T1, start the heating device (240) to heat the second cooling medium in the outer circulation water tank (210); When it is detected that the temperature of the first cooling medium is higher than the second threshold temperature T2, stopping the heating operation of the heating device (240); Among them, T1=T0+△T1, T2=T0+△T2, and △T1≤△T2 is satisfied, and △T1 and △T2 are preset temperature margin values.

7. The temperature control system according to claim 6, characterized in that: The temperature control unit (243) is further configured to, when the heating device (240) is in operation, adjust the set temperature parameters of the refrigeration device (230) so that its refrigeration target temperature is increased according to a preset gradient until a temperature equilibrium point matching the current heating power is reached.

8. The temperature control system according to claim 7, characterized in that: The refrigeration device (230) further comprises: A bypass pipeline, the bypass pipeline is arranged in parallel at two ends of the evaporator (231) to form a medium diversion channel; a flow regulating valve (236), the flow regulating valve (236) being arranged on the bypass pipeline, the flow regulating valve (236) being configured to adjust a flow ratio of a medium flowing through the evaporator (231) and the bypass pipeline; The temperature control unit (243) is further configured to: when the heating device (240) is started, control the flow regulating valve (236) to reduce the flow ratio of the medium flowing through the evaporator (231).

9. The temperature control system according to claim 1, characterized in that: The first closed circulation loop includes the cooling unit (110), the internal circulation water pump (120), the internal circulation water tank (130), and the purification device (140) which are sequentially arranged thereon; The purification device (140) is used to remove impurities from the first cooling medium.

10. The temperature control system according to claim 9, characterized in that: The purification device (140) includes a filter (141) and / or a purifier (142); The filter (141) is arranged in series on the pipeline between the internal circulation water pump (120) and the cooling unit (110), and is used to filter solid impurities in the first cooling medium; The purifier (142) is arranged in series on the pipeline between the cooling part (110) and the internal circulation water tank (110), and is used to remove ions dissolved in the first cooling medium during the internal circulation process.

11. The temperature control system according to claim 2, characterized in that: A pre-filter (250) is provided on the pipeline between the external circulation water tank (210) and the external circulation water pump (220), and the pre-filter (250) is used to filter solid impurities in the second cooling medium.

12. A vibration test bench, characterized in that: The invention comprises a vibration table temperature control system as claimed in any one of claims 1 to 9.

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