Circulating cooling water temperature control system and method of charge air cooler for low-speed machine test bed

Abstract

The invention relates to a supercharged air cooler circulating cooling water temperature control system and method for a low-speed machine test bed, and belongs to the technical field of marine low-speed machine test bed auxiliary engine systems. Comprising a cooling water supply pipe which is connected with an external circulating cooling water supply pipe and a circulating water inlet of the supercharged air cooler; the cooling water return pipe is connected with the circulating water outlet of the supercharged air cooler and the outer circulating cooling water return pipe; one end of the water supply bypass pipe is communicated to the cooling water supply pipe close to the circulating water inlet of the pressurized air cooler, and the other end is communicated to the cooling water return pipe close to the circulating water outlet of the pressurized air cooler; one end of the water return bypass pipe is communicated to the cooling water supply pipe close to the external circulating cooling water supply pipe, and the other end is communicated to the external circulating cooling water return pipe; and a secondary circulating module and a circulating water preheating module are arranged on the cooling water supply pipe. By arranging the secondary circulation module and the circulating water preheating module, accurate control over the cooling water temperature at a circulating water inlet of the supercharged air cooler is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary machine systems of marine low-speed engine test benches, and relates to a circulating cooling water temperature control system and method for a charge air cooler for a low-speed engine test bench. Background Art

[0002] During the test run of marine low-speed engines, there are requirements for the inlet and outlet temperatures of the circulating cooling water passing through the charge air cooler, where the inlet temperature of the circulating cooling water cannot be lower than a certain design value of the corresponding engine model, and the outlet temperature of the circulating cooling water cannot be higher than a certain design value of the corresponding engine model. When the inlet or outlet temperature of the circulating cooling water passing through the charge air cooler exceeds the design value of the corresponding low-speed engine, the air temperature sucked into the cylinder of the low-speed engine will be too low or too high, which will directly affect the performance indicators of the low-speed engine such as combustion efficiency, fuel consumption, emissions and power output. Overcooled air entering the cylinder may even cause poor lubrication between the piston and the cylinder liner.

[0003] At present, the circulating cooling water of the charge air cooler of the low-speed engine test bench adopts the "direct flushing water" system, that is, the external circulating cooling water supply is directly connected to the circulating cooling water inlet of the charge air cooler, and the external circulating cooling water return is directly connected to the circulating cooling water outlet of the charge air cooler. A flow regulating valve is set on the circulating cooling water supply pipeline. By manually adjusting or closing the regulating valve, the purpose of controlling the outlet temperature of the charge air cooler circulating cooling water is achieved. However, valve adjustment requires experienced testers to adjust the regulating valve according to different models and different working conditions, and a test process requires multiple manual adjustments. In addition, the current charge air cooler circulating cooling water system ("direct flushing water" system) directly ignores the control of the charge air cooler circulating cooling water inlet temperature. This type of low-speed engine test bench charge air cooler circulating cooling water system has the problem that the charge air cooler circulating cooling water inlet temperature is lower than the low-speed engine design value during some periods in winter or transition seasons. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a system and method for controlling circulating cooling water temperature of a charge air cooler for a low-speed engine test bench. By setting a secondary circulation module and a circulating water preheating module, the temperature of the external circulating cooling water at the circulating water inlet of the charge air cooler can be accurately controlled, so that the system can flexibly respond to the low-speed engine test needs under various working conditions.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a charge air cooler circulating cooling water temperature control system for a low-speed engine test bench, comprising: a cooling water supply pipe, connected to an external circulating cooling water supply pipe and a charge air cooler circulating water inlet;

[0007] A cooling water return pipe, connecting the circulating water outlet of the charge air cooler and the external circulating cooling water return pipe;

[0008] A water supply bypass pipe, one end of which is connected to the cooling water supply pipe near the circulating water inlet of the charge air cooler, and the other end of which is connected to the cooling water return pipe near the circulating water outlet of the charge air cooler;

[0009] A return water bypass pipe, one end of which is connected to the cooling water supply pipe near the external circulation cooling water supply pipe, and the other end of which is connected to the cooling water return pipe near the external circulation cooling water return pipe;

[0010] Among them, a secondary circulation module and a circulating water preheating module are arranged on the cooling water supply pipe.

[0011] Optionally, the return water bypass pipe is connected to the cooling water supply pipe through an electric three-way temperature control regulating valve, and the mixing ratio of the cooling water supply pipe and the cooling water return water is changed by adjusting the interface opening of the electric three-way temperature control regulating valve, the return water bypass pipe and the cooling water supply pipe.

[0012] Optionally, a temperature sensor matching the electric three-way temperature control regulating valve is provided on the pipe section of the cooling water supply pipe located after the electric three-way temperature control regulation to detect the temperature of the mixed cooling water.

[0013] Optionally, the secondary circulation module includes a first water supply sub-pipe, a second water supply sub-pipe, and a third water supply sub-pipe branched from the cooling water supply pipe.

[0014] Optionally, a first electric gate valve is provided on the first water supply sub-pipe.

[0015] Optionally, the second water supply sub-pipe and the third water supply sub-pipe are both provided with filters and secondary circulation pumps, and the second water supply sub-pipe and the third water supply sub-pipe serve as backup for each other.

[0016] Optionally, the circulating water preheating module comprises a circulating water preheating pipeline branched from the cooling water supply pipe and a fourth water supply sub-pipe.

[0017] Optionally, a circulating water preheating pump and a preheater are provided on the circulating water preheating pipeline.

[0018] Optionally, a second electric gate valve is provided on the fourth water supply sub-pipe.

[0019] Optionally, a third electric valve is provided on the cooling water return pipe.

[0020] In a second aspect, the present invention provides a control method for the circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench, comprising the following steps:

[0021] Get the external circulation cooling water supply temperature;

[0022] Compare the external circulation cooling water feed temperature with the minimum inlet temperature of the charge air cooler circulating cooling water;

[0023] If the external circulating cooling water supply temperature is less than the minimum inlet temperature of the circulating cooling water of the charge air cooler, the circulating water is preheated by the circulating water preheating module;

[0024] If the external circulation cooling water supply temperature is ≥ the minimum inlet temperature of the supercharged air cooler circulating cooling water, start the low-speed engine test bench and start the test run;

[0025] During the test run, the mixing ratio of cooling water supply water and cooling water return water is adjusted by adjusting the opening of the electric three-way temperature control valve to adjust the temperature of the mixed cooling water.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a circulating cooling water system for a charge air cooler for a low-speed engine test bench, which mixes the cooling water supply and the cooling water return by setting a secondary circulation module (mainly including an electric three-way temperature control valve and a secondary circulation pump), thereby ensuring that the temperature of the cooling water entering the charge air cooler always meets the design requirements. This dynamic adjustment mechanism enables the system to maintain a stable cooling effect at various ambient temperatures, especially when the ambient temperature is low during the test run, it can also ensure that the temperature of the cooling water entering the charge air cooler is stable and meets the design standards of the low-speed engine, thereby improving the reliability and flexibility of the system. Furthermore, the present invention provides a circulating cooling water system for a charge air cooler for a low-speed engine test bench, which preheats the cooling water with a lower temperature by setting a circulating water preheating module (mainly including a circulating water preheating pump and a preheater), thereby increasing the temperature of the circulating cooling water entering the charge air cooler, so that the initial temperature of the circulating cooling water entering the charge air cooler meets the design standards of the corresponding low-speed engine, so as to successfully start the test run, which helps to improve production efficiency.

[0028] In addition, by configuring highly adaptable secondary circulation pumps and circulating water preheating pumps, combined with automatic adjustment functions, the system can flexibly respond to the test needs of low-speed machines in various power ranges. This not only reduces the dependence on multiple sets of dedicated cooling systems, but also simplifies equipment management and maintenance. Furthermore, remote monitoring and automatic control functions are realized through the control unit in the circulating cooling water system, including automatic preheating, starting and stopping pumps, adjusting flow and temperature, etc. This highly automated management method greatly reduces the workload of operators, improves work efficiency, and reduces the possibility of human errors.

[0029] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 Schematic diagram of the structure of the circulating cooling water temperature control system for the supercharged air cooler of the low-speed engine test bench provided in the embodiment of the present application Figure 1 ;

[0032] Figure 2 Schematic diagram of the structure of the circulating cooling water temperature control system for the supercharged air cooler of the low-speed engine test bench provided in the embodiment of the present application Figure 2 ;

[0033] Figure 3 A flow chart of a method for controlling a circulating cooling water temperature control system of a charge air cooler for a low-speed engine test bench provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1-filter; 2-secondary circulation pump; 3-circulating water preheating pump; 4-preheater; 5-flow meter; 6-electric regulating valve; 7-electric three-way temperature control regulating valve; 8-first electric gate valve; 9-second electric gate valve; 10-pressure sensor; 11-charged air cooler circulating water inlet temperature sensor; 12-charged air cooler circulating water outlet temperature sensor; 13-third electric gate valve; 14-cooling water supply pipe; 15-water supply bypass pipe; 16-cooling water return pipe; 17-return water bypass pipe; 18-first water supply sub-pipe; 19-second water supply sub-pipe; 20-third water supply sub-pipe; 21-circulating water preheating pipeline; 22-fourth water supply sub-pipe; 23-secondary circulation module; 24-circulating water preheating module. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] See also Figures 1-2, which is a charge air cooler circulating cooling water temperature control system for a low-speed engine test bench, including an external circulation cooling water supply pipe, a charge air cooler circulating water inlet, a charge air cooler circulating water outlet, and an external circulation cooling water return pipe which are sequentially connected through a main circulation pipeline. Specifically, the cooling water supply pipe 14 connects the external circulation cooling water supply pipe and the charge air cooler circulating water inlet to guide the cooling water into the charge air cooler. The cooling water return pipe 16 connects the charge air cooler circulating water outlet and the external circulation cooling water return pipe to guide the cooling water return in the charge air cooler. One end of the water supply bypass pipe 15 is connected to the cooling water supply pipe 14 near the charge air cooler circulating water inlet, and the other end is connected to the cooling water return pipe 16 near the charge air cooler circulating water outlet to guide part of the cooling water supply according to actual conditions, thereby adjusting the flow rate and pressure of the cooling water supply. One end of the return water bypass pipe 17 is connected to the cooling water supply pipe (14) near the external circulation cooling water supply pipe, and the other end is connected to the external circulation cooling water return pipe to introduce cooling water return water and mix it with the cooling water supply water, thereby utilizing the heat energy of the cooling water return water to adjust the cooling water temperature.

[0040] Furthermore, a secondary circulation module 23 and a circulating water preheating module 24 are provided on the cooling water supply pipe 14 .

[0041] In a possible embodiment, the secondary circulation module 23 includes a first water supply sub-pipe 18, a second water supply sub-pipe 19 and a third water supply sub-pipe 20 branched from the cooling water supply pipe 14. The first water supply sub-pipe 18 is provided with a first electric gate valve 8. The second water supply sub-pipe 19 is provided with a filter 1 and a secondary circulation pump 2, and the third water supply sub-pipe 20 is provided with a filter 1 and a secondary circulation pump 2, and the second water supply sub-pipe 19 and the third water supply sub-pipe 20 are standby for each other.

[0042] Specifically, the secondary circulation pump 2 can adopt a marine variable frequency centrifugal pump to provide power for introducing circulating cooling water return and realize partial recycling of circulating cooling water return; the selection of the flow rate of the secondary circulation water pump is determined according to the model of the tested low-speed machine with the greatest demand for circulating cooling water for the supercharger air cooler, and this application does not make any specific restrictions here.

[0043] The filter 1 can filter the circulating cooling water and protect the secondary circulation pump 2, the circulating water preheating pump 3, the preheater 4 and the flow meter 5. A pressure sensor 10 can be installed before and after the filter 1 to monitor the pressure difference before and after the filter 1. When the pressure difference reaches a preset value, the system will sound an alarm to prompt the operator to clean or replace the filter 1 in time.

[0044] Optionally, a flow meter 5 is further provided near the circulating water inlet of the charge air cooler at the cooling water supply pipe 14. The flow meter 5 can be an electromagnetic flow meter or a turbine flow meter to monitor the flow of the circulating cooling water system of the charge air cooler at all times, and transmit the data to the control room of the auxiliary system to adjust the circulating cooling water flow of the auxiliary system.

[0045] In order to improve the reliability and safety of the circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench, redundant equipment can be added to each sub-circulation pipeline. For example, in addition to the first electric gate valve 8, a spare electric gate valve or manual gate valve can be set on the first water supply sub-pipe 18 to be used when the main valve fails. A flow meter 5 and a pressure sensor 10 can also be installed in each sub-circulation pipeline to monitor the water flow and automatically adjust the working state of the pump. In this way, the flow rate can be adjusted according to actual needs to ensure the operating efficiency of the entire system.

[0046] In a possible embodiment, the circulating water preheating module 24 includes a circulating water preheating pipeline 21 branched from the cooling water supply pipe 14 and a fourth water supply sub-pipe 22. The circulating water preheating pipeline 21 is provided with a circulating water preheating pump 3 and a preheater 4. The fourth water supply sub-pipe 22 is provided with a second electric gate valve 9.

[0047] Specifically, the circulating water preheating pump 3 adopts a centrifugal pump. When the external circulating cooling water supply temperature is lower than the minimum inlet temperature of the circulating cooling water of the boost air cooler, the circulating water preheating pump 3 can pressurize the circulating cooling water before the test run and enter the preheater 4 for preheating. The preheating pump flow rate is determined according to the maximum test model, the amount of circulating water contained in the pipeline and the low-speed machine, and the required circulation preheating time.

[0048] Preheater 4 adopts a pipeline preheater to preheat the circulating cooling water to meet the requirements of the external circulating cooling water supply temperature at the circulating water inlet of the supercharged air cooler. The preheater power is determined according to the minimum temperature, maximum flow rate, preheating efficiency and circulation preheating time of the circulating cooling water.

[0049] Optionally, the cooling water supply pipe 14 is provided with a pressure sensor 10 and a temperature sensor 11 near the circulating water inlet of the charge air cooler. The cooling water return pipe 16 is provided with a temperature sensor 12 near the circulating water outlet of the charge air cooler to detect the temperature of the cooling water return.

[0050] Optionally, the water supply bypass pipe 15 is also provided with an electric regulating valve 6. Before the test run, the electric regulating valve 6 can automatically or manually adjust the valve opening according to different machine models.

[0051] In a possible embodiment, a third electric gate valve 13 is provided on the cooling water return pipe 16. In a multi-path or multi-stage system, the direction or distribution ratio of the water flow can be switched by controlling the first electric gate valve 8, the second electric gate valve 9, or the third electric gate valve 13. Furthermore, the electric gate valve is usually equipped with an actuator and a control system, which can remotely control the switch state of the valve. This allows the system to automatically adjust the working parameters according to preset conditions or sensor feedback, improving the convenience and response speed of operation.

[0052] It should be noted that the circulating pipeline, secondary circulating pump 2, circulating water preheating pump 3 and preheater 4 are configured according to the maximum power low-speed engine test requirements that the test bench needs to meet, and this application does not make specific restrictions here. In addition, before the test of different power low-speed engines, the circulating water flow entering the supercharged air cooler can be made to meet the requirements of the corresponding test model by observing the flow meter 5 and automatically or manually controlling the electric valve gate.

[0053] In order to better regulate the circulating water temperature in the circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench, the cooling water supply pipe 14 and the return water bypass pipe 17 are connected by an electric three-way temperature control regulating valve 7. The electric three-way temperature control regulating valve 7 has two inlets and one outlet, one of which is connected to the cooling water supply from the external circulating cooling water supply pipe, and the other inlet is connected to the cooling water return from the return water bypass pipe 17. During the low-speed engine test, when the external circulating water supply temperature is lower than the minimum inlet temperature of the circulating water of the charge air cooler of the low-speed engine, the electric three-way temperature control regulating valve 7 starts to work and mixes a part of the cooling water return with the cooling water supply. By changing the relative flow ratio between the two inlets, the temperature of the mixed water can be accurately adjusted, so that part of the circulating cooling water return water is mixed with the external circulating cooling water supply water through the electric three-way temperature control regulating valve 7. The temperature of the external circulating cooling water supply water after mixing is detected by the temperature sensor, and the opening size of the electric three-way temperature control valve is further controlled, thereby realizing real-time regulation of the circulating water inlet temperature of the supercharger air cooler.

[0054] By installing temperature sensors in various pipes, it is possible to obtain the cooling water supply temperature t1 at the external circulation cooling water supply, the mixed water temperature t5 after mixing through the electric three-way temperature control regulating valve 7, the cooling water temperature t6 after preheating through the circulating water preheating pipe 21, the cooling water temperature t3 input into the supercharged air cooler, the return water temperature t4 flowing out of the supercharged air cooler, and the return water temperature t2 entering the return water bypass pipe 17 after being transported through the cooling water return pipe 16, thereby being able to monitor the water temperature at various locations in the cooling water circulation system in an all-round manner.

[0055] In a possible implementation, the circulating cooling water temperature control system for the charge air cooler for the low-speed engine test bench also includes a control unit. The control unit can transmit the external circulating cooling water supply temperature, flow rate, pressure, start and stop of the secondary circulation pump 2 and the circulating water preheating pump 3, the state of the electric three-way temperature control regulating valve 7, and the opening data of the first electric gate valve 8, the second electric gate valve 9, and the third electric gate valve 13 on the charge air cooler for the low-speed engine test bench to the auxiliary system control room, and can realize the control of the start and stop of the secondary circulation pump 2, the circulating water preheating pump 3, and the preheater 4 in the control room or on site, and can also automatically adjust the opening or opening and closing of the electric gate valve in the control room or on site according to different models, and realize the real-time display of monitoring data, and have prompt and alarm functions. The control unit realizes the automatic control of the flow rate and temperature of the circulating water inlet of the charge air cooler.

[0056] In the specific implementation process, Figure 3 The control method of the circulating cooling water temperature control system of the supercharged air cooler for the low-speed engine test bench mentioned above includes the following steps:

[0057] S101, obtaining the circulating water temperature t1 of the external circulating cooling water supply pipe.

[0058] S102: Before starting the test run, determine whether the external circulating cooling water supply temperature t1 is greater than or equal to the minimum inlet temperature t1 of the circulating cooling water of the supercharged air cooler. min If yes, execute S103 to start the test run; if no, execute S104 to preheat the circulating water through the circulating water preheating module 24.

[0059] Specifically, S103 includes: when the external circulating cooling water supply temperature t1 ≥ the minimum inlet temperature t min , the first electric gate valve 8, the second electric gate valve 9 and the third electric gate valve 13 can be opened automatically in the auxiliary machine system control room or manually on site. At this time, the secondary circulation pump 2, the circulating water preheating pump 3, and the preheater 4 are in a closed state. The circulation path of the circulating cooling water is: external circulation cooling water supply pipe-first water supply sub-pipe 18-fourth water supply sub-pipe 22-charged air cooler circulating water inlet-charged air cooler circulating water outlet-cooling water return pipe 16-external circulation cooling water return pipe. According to the design parameters of the tested model, the electric regulating valve 6 is automatically adjusted in the auxiliary machine system control room or manually adjusted on site. When the flow meter 5 shows that the flow is the same as the design flow of the tested model, check the pressure and temperature of the circulating cooling water at the charge air cooler circulating water inlet in the auxiliary machine system control room or on site. When the displayed circulating cooling water pressure and temperature meet the corresponding model design parameters, it means that the charge air cooler circulating water has reached the test conditions. At this time, the low-speed machine test bench is turned on and the test starts.

[0060] Specifically, S104 includes: when the external circulating cooling water supply temperature t1 is less than the minimum inlet temperature t min When checking the connection of each pipeline, the first electric gate valve 8, circulating water preheating pump 3, preheater 4 and corresponding valves are automatically opened in the auxiliary system control room or manually started on site to inject water into the supercharged air cooler. At this time, the electric three-way temperature control regulating valve 7 is fully opened on the side connected to the cooling water supply pipe 14, and is fully closed on the side connected to the return water bypass pipe 17. When the supercharged air cooler and the connecting pipeline are filled with water, the electric regulating valve 6 and the third electric gate valve 13 are closed. At this time, the circulation path of the circulating cooling water is: external circulation cooling water supply pipe-cooling water supply pipe 14-first water supply sub-pipe 18-circulating water preheating pipeline 21-supercharged air cooler circulating water inlet-supercharged air cooler circulating water outlet-cooling water return pipe 16-return water bypass pipe 17, and finally reaches the secondary circulation module 23, forming a local circulation preheating path. Check the pressure and temperature of the circulating cooling water at the circulating water inlet of the charge air cooler in the auxiliary system control room or on site. When the displayed circulating cooling water pressure and temperature meet the design parameters of the corresponding model, it means that the circulating water of the charge air cooler has reached the test conditions. At this time, start the low-speed engine test bench and start the test run.

[0061] After the system is started in S104, S105 is executed. Specifically, in the startup phase, the external circulating cooling water supply temperature t1 < the minimum inlet temperature of the circulating cooling water of the supercharged air cooler t min In order to increase the external circulating cooling water supply temperature t1, the circulating water preheating pump 3 and the preheater 4 are both in the open state to circulate and preheat the circulating cooling water.

[0062] S105 is specifically, after the successful start-up test, when the return water temperature t2 in the cooling water return pipe 16 is greater than the minimum inlet temperature t min When the return water temperature is high, it can meet the temperature regulation requirements of the cooling water supply, that is, the cooling water supply temperature is increased by mixing with the cooling water return water, thereby replacing the preheating module and putting it into system operation. At this time, the circulating water preheating pump 3 and the preheater 4 are turned off, and only the secondary circulating pump 2 is running. At the same time, with the help of the electric three-way temperature control regulating valve 7, part of the circulating cooling water return water is introduced and mixed with the circulating cooling water supply water to obtain a higher temperature of the external circulating cooling water supply water. On the premise of ensuring that the inlet temperature of the supercharger air cooler circulating water meets the inlet temperature requirements of the supercharger air cooler circulating water, part of the heat energy is recycled and utilized, and the precise control of the circulating water temperature of the supercharger air cooler for the low-speed engine test bench is achieved at a very low cost.

[0063] During the test run, S106 is executed: During the test run, the cooling water temperature t3 at the inlet of the supercharger air cooler is controlled by the electric three-way temperature control regulating valve 7 .

[0064] Specifically, as the test load of the low-speed machine under test changes, the return water temperature of the circulating cooling water will change accordingly, and the electric three-way temperature control regulating valve 7 will also respond accordingly, with the rated working temperature t set The water temperature t5 after the cooling water supply and the cooling water return water are mixed is oscillated to adjust. It can be understood that the mixed water temperature t5 after the control valve indirectly controls the cooling water temperature t3 at the inlet of the supercharged air cooler. At this time, the circulation path of the circulating cooling water is: the supercharged air cooler return water in the return bypass pipe 17 passes through the electric three-way temperature control regulating valve 7 to reach the cooling water supply pipe 14, and the cooling water supply in the cooling water supply pipe 14 passes through the electric three-way temperature control regulating valve 7 to reach the cooling water supply pipe 14, and then flows through the second water supply sub-pipe 19 to the fourth water supply sub-pipe 22, and then enters the circulating water inlet of the supercharged air cooler. Part of the return water flowing out of the supercharged air cooler flows to the external circulation cooling water return pipe through the cooling water return pipe 16, and the other part enters the electric three-way temperature control regulating valve 7 through the return bypass pipe 17, thereby realizing circulation.

[0065] During the test run, the working principle of the electric three-way temperature control regulating valve 7 is as follows: when the temperature sensor of the electric three-way temperature control regulating valve 7 detects the mixed water temperature after the valve t5 < the pre-set rated working temperature t set When (t set ≥t min ), the electric three-way temperature control regulating valve 7 will reduce the opening of the side connected to the cooling water supply pipe 14 and increase the opening of the side connected to the return bypass pipe 17, so that the external circulation cooling water supply temperature approaches the rated working temperature. When the temperature sensor of the electric three-way temperature control regulating valve 7 detects the mixed water temperature t5 after the valve is greater than the pre-set rated working temperature t set When the electric three-way temperature control valve 7 responds accordingly, set The mixed water temperature t5 after the reference oscillation regulating valve.

[0066] The circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench can mix the cooling water supply and the cooling water return by setting the electric three-way temperature control regulating valve 7, so as to ensure that the cooling water temperature entering the charge air cooler always meets the design requirements. This dynamic adjustment mechanism enables the system to maintain a stable cooling effect under various ambient temperatures, avoids the problem of insufficient cooling or overcooling caused by fluctuations in the external temperature, and improves the reliability and flexibility of the system. In addition, the circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench is configured with a highly adaptable secondary circulation pump 2 and a circulating water preheating pump 3, and combined with the automatic adjustment function, the system can flexibly respond to the test needs of low-speed engines within various power ranges. This not only reduces the dependence on multiple sets of dedicated cooling systems, but also simplifies equipment management and maintenance. The control unit in the circulating cooling water temperature control system of the charge air cooler for the low-speed engine test bench realizes remote monitoring and automatic control functions, including automatic preheating, starting and stopping pumps, adjusting flow and temperature, etc. This highly automated management method greatly reduces the workload of operators, improves work efficiency, and reduces the possibility of human errors.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench, characterized in that: include: A cooling water supply pipe (14) connected to the external circulation cooling water supply pipe and the circulating water inlet of the charge air cooler; A cooling water return pipe (16) connected to the circulating water outlet of the charge air cooler and the external circulating cooling water return pipe; A water supply bypass pipe (15), one end of which is connected to a cooling water supply pipe (14) near a circulating water inlet of a supercharged air cooler, and the other end of which is connected to a cooling water return pipe (16) near a circulating water outlet of the supercharged air cooler; A water return bypass pipe (17), one end of which is connected to a cooling water supply pipe (14) close to an external circulation cooling water supply pipe, and the other end of which is connected to a cooling water return pipe (16) close to an external circulation cooling water return pipe; Wherein, a secondary circulation module (23) and a circulating water preheating module (24) are arranged on the cooling water supply pipe (14).

2. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 1, characterized in that: The return water bypass pipe (17) is connected to the cooling water supply pipe (14) through an electric three-way temperature control regulating valve (7), and the mixing ratio of the cooling water supply pipe (14) is changed by adjusting the interface opening between the electric three-way temperature control regulating valve (7) and the return water bypass pipe (17) and the cooling water supply pipe (14).

3. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 2, characterized in that: A temperature sensor matched with the electric three-way temperature control regulating valve (7) is arranged on the pipe section of the cooling water supply pipe (14) located after the electric three-way temperature control regulating valve (7) to detect the temperature of the mixed cooling water.

4. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 1, characterized in that: The secondary circulation module (23) comprises a first water supply sub-pipe (18), a second water supply sub-pipe (19), and a third water supply sub-pipe (20) branched from the cooling water supply pipe (14).

5. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 4, characterized in that: The first water supply sub-pipe (18) is provided with a first electric gate valve (8).

6. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 4, characterized in that: The second water supply sub-pipe (19) and the third water supply sub-pipe (20) are both provided with a filter (1) and a secondary circulation pump (2).

7. A circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to any one of claims 1 to 6, characterized in that: The circulating water preheating module (24) comprises a circulating water preheating pipeline (21) branched from a cooling water supply pipe (14) and a fourth water supply sub-pipe (22); a circulating water preheating pump (3) and a preheater (4) are arranged on the circulating water preheating pipeline (21).

8. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 7, characterized in that: A second electric gate valve (9) is provided on the fourth water supply sub-pipe (22).

9. The circulating cooling water temperature control system for a charge air cooler for a low-speed engine test bench according to claim 1, characterized in that: A third electric valve (13) is provided on the cooling water return pipe (16).

10. A method for controlling circulating cooling water temperature of a charge air cooler for a low-speed engine test bench, based on the charge air cooler circulating cooling water temperature control system for a low-speed engine test bench according to any one of claims 1 to 9, characterized in that: The following steps are involved: Get the external circulation cooling water supply temperature; Compare the external circulation cooling water feed temperature with the minimum inlet temperature of the charge air cooler circulating cooling water; If the external circulating cooling water supply temperature is less than the minimum inlet temperature of the circulating cooling water of the charge air cooler, the circulating water is preheated by the circulating water preheating module; If the external circulation cooling water supply temperature is ≥ the minimum inlet temperature of the supercharged air cooler circulating cooling water, start the low-speed engine test bench and start the test run; During the test run, the mixing ratio of cooling water supply water and cooling water return water is adjusted by adjusting the opening of the electric three-way temperature control valve to adjust the temperature of the mixed cooling water.

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