Water heat exchange cooling machine for hydraulic station test system

Abstract

The utility model provides a water heat exchange cooling machine for a hydraulic station test system, and relates to the technical field of industrial temperature control. The cooling machine comprises a refrigeration cycle system, a water tank, a first temperature probe, a second temperature probe and an electric proportional valve, wherein the refrigeration cycle system is composed of a compressor, a hot gas bypass valve and the like. The first temperature probe and the PLC control water tank control the temperature of cooling water to be smaller than or equal to 20 + / -1 DEG C. The second temperature probe and the PLC control electric proportional valve maintain the oil temperature to be smaller than or equal to 35 + / -1 DEG C. The system can solve the problems that a traditional manual testing system is complex in structure, high in cost, low in precision and the like, can be suitable for free conversion of the oil supply flow of 1-30 L / min in a hydraulic station test, and ensures the stability of the oil temperature. Meanwhile, the system has the advantages of stable control of the refrigerating system, no oil film formation of the plate heat exchanger, saving of the purchase cost of multiple oil coolers and the like, and meets the test requirements of modern hydraulic components.

Description

Technical Field

[0001] This application relates to the field of industrial temperature control technology, specifically to a water heat exchanger cooler for a hydraulic station testing system. Background Technology

[0002] In the industrial sector, especially in the industrial temperature control field where hydraulic station testing systems operate, traditional testing systems are facing severe challenges. As the manufacturing industry develops towards intelligence and high precision, the testing requirements for hydraulic components are also increasing.

[0003] Traditional manual testing systems exhibit numerous drawbacks when testing hydraulic power units. These systems rely heavily on manual intervention, making the testing process and results significantly susceptible to human error. For example, differences in operator skill levels, concentration, and operating habits all influence test results to varying degrees, leading to low accuracy. This low-precision data fails to meet the demands of modern hydraulic component design, production, and quality inspection for high-precision test data. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a water heat exchanger cooler for a hydraulic station testing system, comprising:

[0005] A water tank for holding cooling water, the water tank having an inlet pipe and an outlet pipe;

[0006] A refrigeration cycle module is connected to the water inlet pipe. The refrigeration cycle module has a refrigeration state and a standby state. In the refrigeration state, the refrigeration cycle module is used to cool the cooling water so that the cooling water in the water tank is maintained at a first temperature threshold.

[0007] The hydraulic oil module includes a first plate heat exchanger connected to the outlet pipe, the first plate heat exchanger having circulating hydraulic oil, and the outlet pipe having a first switch, the first switch being used to regulate the flow rate of cooling water entering the first plate heat exchanger to exchange heat with the hydraulic oil, so that the oil temperature of the hydraulic oil after heat exchange is maintained at a second temperature threshold, the second temperature threshold being greater than the first temperature threshold.

[0008] The control module is used to control the switching of the refrigeration cycle module between the refrigeration state and the standby state, as well as the opening degree of the first switch.

[0009] According to the technical solution provided in the embodiments of this application, a first temperature probe is provided in the water tank. The first temperature probe is used to monitor the water temperature of the cooling water in the water tank in real time and generate a water temperature signal to be transmitted to the control module.

[0010] According to the technical solution provided in the embodiments of this application, the first plate heat exchanger is also connected to an oil supply pipe and an oil return pipe. A second temperature probe is provided on the oil supply pipe. The second temperature probe is used to monitor the oil temperature of the hydraulic oil flowing in the first plate heat exchanger in real time and generate an oil temperature signal to be transmitted to the control module.

[0011] According to the technical solution provided in the embodiments of this application, the refrigeration cycle module includes a refrigerant generating component and a second plate heat exchanger connected to the refrigerant generating component. The refrigerant generating component is used to generate a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant enters the second plate heat exchanger and absorbs the heat of the cooling water flowing through the second plate heat exchanger, so as to cool the cooling water.

[0012] According to the technical solution provided in the embodiments of this application, the refrigerant generating assembly includes a compressor connected to the second plate heat exchanger, and a hot gas bypass valve, a condenser, a dryer filter, a refrigeration solenoid valve, and an expansion valve connected in sequence; the compressor and the expansion valve are respectively connected to the second plate heat exchanger to form a refrigeration cycle path.

[0013] According to the technical solution provided in the embodiments of this application, the second plate heat exchanger has a first channel and a second channel isolated from the first channel. The two ends of the first channel are respectively connected to the compressor and the expansion valve, and the two ends of the second channel are respectively connected to the water inlet pipe and the first plate heat exchanger.

[0014] According to the technical solution provided in the embodiments of this application, the first plate heat exchanger has a third channel and a fourth channel isolated from the third channel. The two ends of the third channel are respectively connected to the oil supply pipe and the oil return pipe, and hydraulic oil flows in the third channel. The two ends of the fourth channel are respectively connected to the water outlet pipe and the second channel, and the cooling water flowing into the fourth channel exchanges heat with the hydraulic oil flowing in the third channel.

[0015] According to the technical solution provided in the embodiments of this application, the return oil pipeline is also equipped with an oil pressure gauge.

[0016] According to the technical solution provided in the embodiments of this application, the first temperature threshold is 15°C lower than the second temperature threshold.

[0017] According to the technical solution provided in the embodiments of this application, the first temperature threshold is 20±1℃, and the second temperature threshold is 35±1℃.

[0018] Compared with existing technologies, the advantages of this application are as follows: This hydraulic station testing system uses a water heat exchanger cooler to precisely control the temperature of the cooling water in the water tank and the temperature of the hydraulic oil after heat exchange by setting a first temperature threshold and a second temperature threshold, respectively. The refrigeration circulation module maintains the cooling water in the water tank within a specific low-temperature range based on the first temperature threshold, providing a stable cold source for the heat exchange of the hydraulic oil. Simultaneously, the control module adjusts the opening of the first switch to precisely control the flow rate of cooling water entering the first plate heat exchanger according to the second temperature threshold, thereby achieving precise regulation of the hydraulic oil temperature. This precise temperature control method effectively avoids test errors caused by temperature fluctuations, significantly improving the accuracy and reliability of test results. It can adapt to working conditions where the oil supply flow rate freely changes within the range of 1-30 L / min during hydraulic station testing. Through the coordinated work of the refrigeration circulation module, the hydraulic oil module, and the control module, the hydraulic oil temperature can be effectively maintained stable regardless of changes in the oil supply flow rate, ensuring that the hydraulic station can operate normally under various complex working conditions, greatly improving the adaptability of the testing system to different working scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the water heat exchanger cooling machine of the hydraulic station testing system provided in the embodiments of this application.

[0020] The text labels in the image represent:

[0021] 1. Compressor; 2. Hot gas bypass valve; 3. Condenser; 4. Dryer filter; 5. Refrigeration solenoid valve; 6. Expansion valve; 7. Second plate heat exchanger; 8. Water tank; 9. First temperature probe; 10. First drain port; 11. Second drain port; 12. Bypass valve; 13. First switch; 14. First plate heat exchanger; 15. Second temperature probe; 16. Oil supply port; 17. Oil return port; 18. Oil pressure gauge. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Example 1

[0025] As mentioned in the background section, in view of the problems in the prior art, this application proposes a water heat exchanger cooler for a hydraulic station testing system, such as... Figure 1 As shown, it includes:

[0026] Water tank 8, which is used to contain cooling water, has an inlet pipe and an outlet pipe;

[0027] Specifically, the bottom of the water tank 8 also has a first drain port 10, which facilitates the discharge of impurities and wastewater accumulated in the water tank 8, or the emptying of the water tank 8 during maintenance and repair. A second drain port 11 is also provided on the outlet pipe for system maintenance, cleaning, and troubleshooting. Regularly discharging impurities and wastewater through the first drain port 10 or the second drain port 11 ensures the cleanliness of the cooling water and prevents impurities from affecting the normal operation of the refrigeration cycle system, the first plate heat exchanger 14, and the second plate heat exchanger 7. During equipment repair, maintenance, or system modification, the liquid in the relevant components can be drained, facilitating operation.

[0028] A refrigeration cycle module is connected to the water inlet pipe. The refrigeration cycle module has a refrigeration state and a standby state. In the refrigeration state, the refrigeration cycle module is used to cool the cooling water so that the cooling water in the water tank 8 is maintained at a first temperature threshold.

[0029] Specifically, a hot gas bypass valve 2 is installed on the pipeline between the discharge port of compressor 1 and the inlet of condenser 3. At this location, the hot gas bypass valve 2 can divert the high-temperature, high-pressure gaseous refrigerant discharged from compressor 1.

[0030] The hydraulic oil module includes a first plate heat exchanger 14 connected to the outlet pipe. The first plate heat exchanger 14 contains circulating hydraulic oil. The outlet pipe has a first switch 13. The first switch 13 is used to adjust the flow rate of cooling water entering the first plate heat exchanger 14 to exchange heat with the hydraulic oil, so that the oil temperature of the hydraulic oil after heat exchange is maintained at a second temperature threshold, which is greater than the first temperature threshold.

[0031] Specifically, the first switch 13 is an electric proportional valve; the flow rate of cooling water entering the first plate heat exchanger 14 to exchange heat with the hydraulic oil is adjusted by controlling the opening degree.

[0032] The control module is used to control the switching of the refrigeration cycle module between the refrigeration state and the standby state, as well as the opening degree of the first switch 13.

[0033] Furthermore, the first temperature threshold is 15°C lower than the second temperature threshold.

[0034] Furthermore, the first temperature threshold is 20±1℃, and the second temperature threshold is 35±1℃.

[0035] Specifically, based on the system's control requirements, a suitable PLC controller is selected as the control module, and programmed according to its instruction manual. The signals from the first temperature probe 9 and the second temperature probe 15 are input to the PLC module. The program is used to implement control logic such as starting the refrigeration cycle module when the water temperature is above 20℃ and stopping it when the water temperature is below 19℃; increasing the opening of the first switch 13 when the oil temperature is above 35℃ and decreasing it when the oil temperature is below 34℃. Simultaneously, the control output ports of the PLC controller are connected to the control interface of the refrigeration cycle module (such as the start / stop control interface of compressor 1) and the control interface of the first switch 13, respectively, to achieve precise control of the refrigeration cycle module and the first switch 13.

[0036] In a preferred embodiment, the water tank 8 is provided with a first temperature probe 9, which is used to monitor the water temperature of the cooling water in the water tank 8 in real time and generate a water temperature signal to be transmitted to the control module.

[0037] In a preferred embodiment, the first plate heat exchanger 14 is further connected to an oil supply pipe and an oil return pipe. The oil supply pipe is equipped with a second temperature probe 15, which is used to monitor the oil temperature of the hydraulic oil flowing in the first plate heat exchanger 14 in real time and generate an oil temperature signal to be transmitted to the control module.

[0038] Specifically, one end of the oil supply pipeline has an oil supply port 16, and one end of the oil return pipeline has an oil return port 17. The oil supply port 16 is usually connected to the hydraulic pump outlet of the hydraulic station, and the oil return port 17 is generally connected to the return end of the hydraulic actuator (such as a cylinder or motor). After the hydraulic actuator performs work, the hydraulic oil temperature will rise. It flows back through the oil return pipeline and the oil return port 17, and re-enters the first plate heat exchanger 14 for cooling. Afterward, it may return to the oil tank of the hydraulic station for recycling. This forms a complete hydraulic oil circulation loop, ensuring the stable operation of the hydraulic system.

[0039] In a preferred embodiment, the refrigeration cycle module includes a refrigerant generating component and a second plate heat exchanger 7 connected to the refrigerant generating component. The refrigerant generating component is used to generate a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant enters the second plate heat exchanger 7 and absorbs the heat of the cooling water flowing through the second plate heat exchanger 7, thereby cooling the cooling water.

[0040] In a preferred embodiment, the refrigerant generating assembly includes a compressor 1 connected to the second plate heat exchanger 7, and a hot gas bypass valve, a condenser 3, a dryer filter 4, a refrigeration solenoid valve 5, and an expansion valve 6 connected in sequence; the compressor 1 and the expansion valve 6 are respectively connected to the second plate heat exchanger 7 to form a refrigeration cycle path.

[0041] Specifically, the principle of forming low-temperature, low-pressure liquid refrigerant is as follows: In the refrigeration state, the compressor 1 works to compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. After passing through the hot gas bypass valve and the condenser 3, the refrigerant is condensed into a high-pressure liquid. After removing moisture and impurities through the dryer filter 4, it enters the expansion valve 6 through the refrigeration solenoid valve 5 for throttling and pressure reduction, thus becoming a low-temperature, low-pressure liquid refrigerant.

[0042] Specifically, a compressor 1 with matching performance, a hot gas bypass valve, a condenser 3, a dryer filter 4, a refrigeration solenoid valve 5, an expansion valve 6, and a second plate heat exchanger 7 are selected. Following the refrigeration cycle workflow, each component is connected sequentially to ensure smooth refrigerant flow. The refrigerant channel of the second plate heat exchanger 7 (i.e., the first channel described later) forms a closed loop with other components. One end of the cooling water channel (i.e., the second channel described later) is connected to the inlet pipe of the water tank 8, and the other end can be fitted with a suitable interface according to actual conditions to connect to a possible subsequent circulation system; here, it can be connected to the first plate heat exchanger 14. Simultaneously, the first temperature probe 9 is installed in a suitable position inside the water tank 8 to ensure accurate monitoring of the cooling water temperature, and its signal output line is connected to the corresponding input port of the PLC controller.

[0043] In a preferred embodiment, the second plate heat exchanger 7 has a first channel and a second channel isolated from the first channel. The two ends of the first channel are respectively connected to the compressor 1 and the expansion valve 6, and the two ends of the second channel are respectively connected to the water inlet pipe and the first plate heat exchanger 14.

[0044] In a preferred embodiment, the first plate heat exchanger 14 has a third channel and a fourth channel isolated from the third channel. The two ends of the third channel are respectively connected to the oil supply pipe and the oil return pipe, and hydraulic oil flows in the third channel. The two ends of the fourth channel are respectively connected to the water outlet pipe and the second channel, and the cooling water flowing into the fourth channel exchanges heat with the hydraulic oil flowing in the third channel.

[0045] Specifically, hydraulic oil flows in the third channel, and cooling water flows in the fourth channel. Heat is transferred between the two through the plates of the first plate heat exchanger 14. One end of the fourth channel is connected to the water tank 8 to obtain low-temperature cooling water, providing a cold source for heat exchange. The other end is connected to the second channel of the second plate heat exchanger 7, allowing the cooling water, after heat exchange in the first plate heat exchanger 14, to further interact with the refrigeration cycle system in the second plate heat exchanger 7, further reducing its temperature. Then, it circulates back to the water tank 8, maintaining the low temperature of the cooling water and ensuring continuous and efficient heat exchange.

[0046] Specifically, one end of the fourth channel is connected to the second channel via the first connecting pipe. A bypass valve 12 is connected in parallel between the first connecting pipe and the outlet pipe. Under different operating conditions of the hydraulic station testing system, the required cooling water flow varies. The bypass valve 12 can control some cooling water to flow directly from the outlet pipe to other parts without passing through the conventional path between the fourth channel and the first connecting pipe. For example, when the hydraulic station's oil supply flow is low, the hydraulic oil generates less heat. The bypass valve 12 opens, reducing the cooling water flow into the fourth channel, preventing over-cooling, and maintaining system thermal balance. Furthermore, during system operation, pipe pressure fluctuates due to various factors. When the bypass valve 12 is open, it allows cooling water to flow between the outlet pipe and the first connecting pipe, balancing the pressure of the two pipes, preventing damage to pipes, valves, and other components due to excessive pressure, and ensuring stable and safe system operation.

[0047] In a preferred embodiment, an oil pressure gauge 18 is also provided on the return oil pipeline.

[0048] Specifically, the oil pressure gauge 18 is installed in the hydraulic oil circulation path, such as near the hydraulic pump outlet, on the hydraulic oil pipeline between the first plate heat exchanger 14 and the return port 17, to accurately measure the hydraulic oil pressure. By observing the reading on the oil pressure gauge 18, operators can determine whether the hydraulic system is operating normally. Abnormal oil pressure may indicate problems such as hydraulic pump failure, pipeline blockage, or leakage. The oil pressure gauge 18 can provide timely information for fault diagnosis, ensuring the hydraulic station operates within a safe and stable pressure range.

[0049] Specifically, the control module includes a PLC controller with pre-installed control logic. Specifically, the first temperature probe 9 monitors the cooling water temperature in the water tank 8 in real time and transmits the temperature signal to the PLC module. When the water temperature is above 20℃, the PLC controller controls the refrigeration cycle module to enter refrigeration mode and starts the compressor 1 for cooling; when the water temperature is below 19℃, the refrigeration cycle module enters standby mode and stops the compressor 1. The second temperature probe 15 monitors the hydraulic oil temperature in the first plate heat exchanger 14 in real time and transmits the oil temperature signal to the PLC module. When the oil temperature is above 35℃, the PLC controller controls the first switch 13 to increase its opening, increasing the cooling water flow into the first plate heat exchanger 14; when the oil temperature is below 34℃, the first switch 13 is controlled to decrease its opening, reducing the cooling water flow. In this way, the PLC controller achieves precise control of the refrigeration cycle module and the first switch 13, ensuring that the cooling water temperature and hydraulic oil temperature remain stable within the set first and second temperature threshold ranges, respectively.

[0050] Specifically, the hydraulic station testing system in this solution uses a water-cooled heat exchanger, which is suitable for regulating the flow rate of the hydraulic station and meets the requirements for stable oil temperature during testing. The refrigeration system is stably controlled, extending its service life. No oil film forms inside the plate heat exchanger, thus not affecting heat exchange. Furthermore, compared to traditional solutions, it saves the cost of purchasing multiple oil coolers.

[0051] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A water heat exchanger cooler for a hydraulic station test system, characterized in that, The application relates to a refrigeration system, which comprises: a water tank (8) for containing cooling water, the water tank (8) being provided with an inlet pipe and an outlet pipe; a refrigeration cycle module connected with the inlet pipe, the refrigeration cycle module having a refrigeration state and a standby state, in the refrigeration state, the refrigeration cycle module is used for cooling the cooling water so as to maintain the cooling water in the water tank (8) at a first temperature threshold; a hydraulic oil module, the hydraulic oil module comprising a first plate heat exchanger (14) connected with the outlet pipe, the first plate heat exchanger (14) being provided with flowing hydraulic oil, the outlet pipe being provided with a first switch (13), the first switch (13) is used for adjusting the flow of the cooling water entering the first plate heat exchanger (14) to exchange heat with the hydraulic oil, so that the oil temperature of the exchanged hydraulic oil is maintained at a second temperature threshold, the second temperature threshold being greater than the first temperature threshold; a control module for controlling the refrigeration cycle module to switch between the refrigeration state and the standby state and the opening degree of the first switch (13).

2. The water heat exchanger cooler for hydraulic station test system according to claim 1, characterized in that: The water tank (8) is provided with a first temperature probe (9) for monitoring the water temperature of the cooling water in the water tank (8) in real time and generating a water temperature signal transmitted to the control module.

3. The water heat exchanger cooler for hydraulic station test system according to claim 1, characterized in that: The first plate heat exchanger (14) is further provided with an oil supply pipeline and an oil return pipeline, the oil supply pipeline is provided with a second temperature probe (15) for monitoring the oil temperature of the hydraulic oil flowing in the first plate heat exchanger (14) in real time and generating an oil temperature signal transmitted to the control module.

4. The water heat exchanger cooler for hydraulic station test system according to claim 1, characterized in that: The refrigeration cycle module comprises a refrigerant generating assembly and a second plate heat exchanger (7) connected with the refrigerant generating assembly, the refrigerant generating assembly is used for generating low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant enters the second plate heat exchanger (7) to absorb the heat of the cooling water flowing through the second plate heat exchanger (7) so as to cool the cooling water.

5. The water heat exchanger cooler for hydraulic station test system according to claim 4, characterized in that: The refrigerant generating assembly comprises a compressor (1) connected with the second plate heat exchanger (7), and a hot gas bypass valve, a condenser (3), a drying filter (4), a refrigeration electromagnetic valve (5) and an expansion valve (6) connected in sequence; the compressor (1) and the expansion valve (6) are respectively connected to the second plate heat exchanger (7) to form a refrigeration cycle path.

6. The water heat exchanger cooler for hydraulic station test system according to claim 5, characterized in that: The second plate heat exchanger (7) is provided with a first channel and a second channel insulated from the first channel, two ends of the first channel are respectively connected with the compressor (1) and the expansion valve (6), and two ends of the second channel are respectively connected with the inlet pipe and the first plate heat exchanger (14).

7. The water heat exchanger cooler for hydraulic station test system according to claim 3, characterized in that: The first plate heat exchanger (14) has a third channel and a fourth channel isolated from the third channel, two ends of the third channel are connected with the oil supply pipeline and the oil return pipeline respectively, and hydraulic oil flows in the third channel; two ends of the fourth channel are connected with the water outlet and the second channel respectively, and cooling water flowing into the fourth channel exchanges heat with the hydraulic oil flowing in the third channel.

8. The water heat exchanger cooler for hydraulic station test system according to claim 3, characterized in that: An oil pressure gauge (18) is further arranged on the oil return pipeline.

9. The water heat exchanger cooler for hydraulic station test system of claim 1, wherein: The first temperature threshold is 15℃ lower than the second temperature threshold.

10. The water heat exchanger cooler for hydraulic station test system of claim 9, wherein: The first temperature threshold is 20±1℃, and the second temperature threshold is 35±1℃.

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