Circulating cooling water system of supercharged air cooler for low-speed machine test bed

Abstract

The utility model relates to a supercharged air cooler circulating cooling water system for a low-speed machine test bed, and belongs to the technical field of auxiliary engine systems of marine low-speed machine test beds. 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 return bypass pipe is communicated to the cooling water supply pipe close to the external circulating cooling water supply port, and the other end is communicated to the cooling water return pipe close to the external circulating cooling water return pipe; the cooling water supply pipe is communicated with the return water bypass pipe through an electric three-way temperature control regulating valve, a secondary circulating pump is arranged behind the electric three-way temperature control regulating valve, and the mixing proportion of cooling water supply and return water is changed by adjusting the opening degree of two inlets of the electric three-way temperature control regulating valve. Therefore, the problem that the temperature of cooling water is too low due to the too low environment temperature in the test run process is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the low -speed machine test bed auxiliary machine system technical field of marine belongs to and relates to a kind of pressurized air cooler circulating cooling water systems for low-speed machine test bed. BACKGROUND

[0002] During the test running of the low-speed engine, the inlet temperature and outlet temperature of the circulating cooling water passing through the pressurized air cooler are required, wherein 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 pressurized 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, oil consumption, emission and power output. The over-cooled air entering the cylinder can even cause poor lubrication between the piston and the cylinder sleeve.

[0003] Currently, the circulating cooling water of the pressurized air cooler of the low-speed engine test bed adopts a "direct water flushing" system, that is, the external circulating cooling water feed is directly connected to the inlet of the circulating cooling water of the pressurized air cooler, the external circulating cooling water return is directly connected to the outlet of the circulating cooling water of the pressurized air cooler, a flow regulating valve is arranged on the circulating cooling water feed pipeline, and the outlet temperature of the circulating cooling water of the pressurized air cooler is controlled by manually adjusting or closing the circulating regulating valve. However, experienced testers are required to adjust the valve according to different engine models and different working conditions, and the test process needs to be adjusted manually several times. In addition, the current pressurized air cooler circulating cooling water system ("direct water flushing" system) directly ignores the control of the inlet temperature of the circulating cooling water of the pressurized air cooler. The circulating cooling water inlet temperature of the pressurized air cooler of this type of low-speed engine test bed is lower than the design value of the low-speed engine in winter or in some seasons. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims to provide a pressurized air cooler circulating cooling water system for low-speed engine test bed, which can alleviate the cooling water feed and cooling water return by setting a secondary circulating module to solve the problem of substandard cooling water temperature in low-temperature environment during test running. The cooling water feed is preheated by setting a circulating water preheating module to solve the problem of low cooling water temperature before starting the test running.

[0005] To achieve the above-mentioned purpose, the utility model provides a pressurized air cooler circulating cooling water system for low-speed engine test bed, which comprises:

[0006] A cooling water feed pipeline is connected to the external circulating cooling water feed pipeline and the inlet of the circulating water of the pressurized air cooler.

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

[0008] return bypass pipe, one end of which is communicated to the cooling water supply pipe near the outer circulating cooling water supply pipe, and the other end of which is communicated to the cooling water return pipe near the outer circulating cooling water return pipe;

[0009] The cooling water supply pipe and the return bypass pipe are communicated through an electric three-way temperature control regulating valve, and a secondary circulating pump is arranged behind the electric three-way temperature control regulating valve.

[0010] Optionally, a flow meter is arranged on the cooling water supply pipe near the charge air cooler circulating water inlet.

[0011] Optionally, a charge air cooler circulating water outlet temperature sensor is arranged on the cooling water return pipe near the charge air cooler circulating water outlet.

[0012] Optionally, a third electric gate valve is arranged on the cooling water return pipe near the outer circulating cooling water return pipe.

[0013] Optionally, a secondary circulating module is arranged on the cooling water supply pipe, and the secondary circulating 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 arranged on the first water supply sub-pipe, and a filter and a secondary circulating pump are arranged on the second water supply sub-pipe and the third water supply sub-pipe, and the second water supply sub-pipe and the third water supply sub-pipe are mutually reserved.

[0015] Optionally, a circulating water preheating module is arranged on the cooling water supply pipe, and the circulating water preheating module includes a circulating water preheating pipeline and a fourth water supply sub-pipe branched from the cooling water supply pipe.

[0016] Optionally, a circulating water preheating pump and a preheater are arranged on the circulating water preheating pipeline, and a second electric gate valve is arranged on the fourth water supply sub-pipe.

[0017] Optionally, the system further includes a water supply bypass pipe, one end of which is communicated to the cooling water supply pipe near the charge air cooler circulating water inlet, and the other end of which is communicated to the cooling water return pipe near the charge air cooler circulating water outlet.

[0018] The utility model has the advantages that:

[0019] The circulating cooling water system of the supercharged air cooler for the low-speed machine test bed provided by the utility model mixes the cooling water feed water and the cooling water return water through the secondary circulation module (mainly including the electric three-way temperature control regulating valve and the secondary circulation pump), so that the temperature of the cooling water entering the supercharged air cooler always meets the design requirements. The dynamic adjustment mechanism enables the system to maintain stable cooling effect under various environmental temperatures, especially in the case of low environmental temperature during the test run, the temperature of the cooling water entering the supercharged air cooler is stable and meets the design standard of the low-speed machine, and the reliability and flexibility of the system are improved. Furthermore, the circulating cooling water system of the supercharged air cooler for the low-speed machine test bed provided by the utility model preheats the cooling water with low temperature through the circulating water preheating module (mainly including the circulating water preheating pump and the preheater), so that the temperature of the circulating cooling water entering the supercharged air cooler is increased, the initial temperature of the circulating cooling water entering the supercharged air cooler meets the design standard of the corresponding low-speed machine, the test run is successfully started, and the production efficiency is improved.

[0020] In addition, by configuring the high-adaptive secondary circulation pump and the circulating water preheating pump and combining the automatic adjusting function, the system can flexibly cope with the test run requirements of the low-speed machine in various power ranges. This not only reduces the dependence on multiple special cooling systems, but also simplifies the equipment management and maintenance work. Further, the remote monitoring and automatic control functions are realized through the control unit in the circulating cooling water system, including automatic preheating, pump starting and stopping, flow and temperature adjustment, etc. This highly automated management mode greatly reduces the work intensity of the operators, improves the work efficiency, and reduces the possibility of human errors.

[0021] Other advantages, objects, and features of the utility model will be explained in the following description to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the objects, technical schemes and advantages of the utility model more clear, the preferred detailed description of the utility model will be combined with the drawings as follows, in which:

[0023] Figure 1 The structure diagram of the circulating cooling water system of the supercharged air cooler for the low-speed machine test bed provided by the utility model Figure 1 ;

[0024] Figure 2 The structure diagram of the circulating cooling water system of the supercharged air cooler for the low-speed machine test bed provided by the utility model Figure 2 .

[0025] Reference signs:

[0026] 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-boost air cooler circulating water inlet temperature sensor; 12-boost air cooler circulating water outlet temperature sensor; 13-third electric gate valve; 14-cooling water feed pipe; 15-feed bypass pipe; 16-cooling water return pipe; 17-return bypass pipe; 18-first feed sub-pipe; 19-second feed sub-pipe; 20-third feed sub-pipe; 21-circulating water preheating pipe; 22-fourth feed sub-pipe; 23-secondary circulation module; 24-circulating water preheating module. DETAILED DESCRIPTION

[0027] The above and other advantages and effects of the present application can be easily understood from the description of the embodiments of the present application. The present application can also be embodied in different ways, and the details of the present application can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the features in the following examples and embodiments can be combined with each other without conflict.

[0028] The drawings are only used for illustrative purposes, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes, and cannot be understood as a limitation of the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Please refer to Figures 1-2The application discloses a circulating cooling water system for a turbocharger test bench, which comprises an outer circulating cooling water supply pipe, a turbocharger circulating water inlet, a turbocharger circulating water outlet and an outer circulating cooling water return pipe which are sequentially connected by a main circulating pipe. Specifically, the cooling water supply pipe 14 is connected to the outer circulating cooling water supply pipe and the turbocharger circulating water inlet to guide the cooling water into the turbocharger. The cooling water return pipe 16 is connected to the turbocharger circulating water outlet and the outer circulating cooling water return pipe to guide the cooling water return in the turbocharger. The water supply bypass pipe 15 is connected to the cooling water supply pipe 14 near the turbocharger circulating water inlet at one end and connected to the cooling water return pipe 16 near the turbocharger circulating water outlet at the other end to guide part of the cooling water supply according to the actual situation, so as to adjust the flow and pressure of the cooling water supply. The water return bypass pipe 17 is connected to the cooling water supply pipe 14 near the outer circulating cooling water supply pipe at one end and connected to the outer circulating cooling water return pipe at the other end to introduce the cooling water return and mix with the cooling water supply, so as to adjust the cooling water temperature by using the heat energy of the cooling water return.

[0031] Further, the cooling water supply pipe 14 is provided with a secondary circulating module 23 and a circulating water preheating module 24.

[0032] In a possible embodiment, the secondary circulating 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 which are 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 circulating pump 2, and the third water supply sub-pipe 20 is provided with a filter 1 and a secondary circulating pump 2. The second water supply sub-pipe 19 and the third water supply sub-pipe 20 are mutual backups.

[0033] Specifically, the secondary circulating pump 2 can adopt a marine variable frequency centrifugal pump to provide power for introducing the circulating cooling water return and realize the recirculation of part of the circulating cooling water return. The flow of the secondary circulating pump is determined according to the model of the tested low-speed engine which has the largest demand for the turbocharger circulating cooling water, and the application does not make specific limitation here.

[0034] The filter 1 can filter the circulating cooling water to protect the secondary circulating pump 2, the circulating water preheating pump 3, the preheater 4 and the flow meter 5 and the like. Pressure sensors 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 issue an alarm to prompt the operator to clean or replace the filter 1 in time.

[0035] Optionally, the cooling water supply pipe 14 is also provided with a flow meter 5 near the inlet of the supercharged air cooler circulating water. The flow meter 5 can be an electromagnetic flow meter or a turbine flow meter, which monitors the flow of the circulating cooling water of the supercharged air cooler at all times and transmits the data to the auxiliary system control room, assisting the system in adjusting the flow of the circulating cooling water.

[0036] To improve the reliability and safety of the circulating cooling water temperature control system of the supercharged air cooler of the low-speed engine test stand, redundant devices can be added to each sub-circulating pipe. For example, a backup electric valve or a manual valve can be provided on the first water supply sub-pipe 18 in addition to the first electric valve 8, so as to be used in case of failure of the main valve. A flow meter 5 and a pressure sensor 10 can also be installed in each sub-circulating pipe 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, ensuring the operating efficiency of the entire system.

[0037] In a possible embodiment, the circulating water preheating module 24 includes a circulating water preheating pipe 21 branched from the cooling water supply pipe 14 and a fourth water supply sub-pipe 22. The circulating water preheating pipe 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 valve 9.

[0038] Specifically, the circulating water preheating pump 3 is a centrifugal pump, which can pressurize the circulating cooling water and enter the preheater 4 for preheating when the temperature of the external circulating cooling water supply is lower than the minimum inlet temperature of the supercharged air cooler circulating cooling water. The preheating pump flow rate is determined according to the maximum test engine type, the amount of circulating water contained in the pipe and the low-speed engine, and the required preheating time.

[0039] The preheater 4 is a pipe-type preheater, which preheats the circulating cooling water to meet the requirements of the external circulating cooling water supply temperature at the inlet of the supercharged air cooler. The power of the preheater is determined according to the possible minimum temperature, maximum flow rate, preheating efficiency and preheating time of the circulating cooling water.

[0040] Optionally, the cooling water supply pipe 14 is provided with a pressure sensor 10 and a temperature sensor 11 near the inlet of the supercharged air cooler circulating water. The cooling water return pipe 16 is provided with a temperature sensor 12 near the outlet of the supercharged air cooler circulating water to detect the temperature of the cooling water return.

[0041] Optionally, the water supply bypass pipe 15 is also provided with an electric regulating valve 6, which can automatically or manually adjust the valve opening according to different engine types before the test.

[0042] Optionally, flow meters 5 and pressure sensors 10 are installed on each sub-circulation water preheating pipeline to monitor the water flow status in real time and adjust the speed of the preheating pump or open / close the valve to maintain stable operation of the system.

[0043] In one possible embodiment, a third electric gate valve 13 is provided on the cooling water return pipeline 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 or the second electric gate valve 9 or the third electric gate valve 13. Further, the electric valve gate is usually equipped with an actuator and a control system, which can remotely control the opening and closing state of the valve. This enables the system to automatically adjust the operating parameters according to the preset conditions or sensor feedback, improving the convenience and response speed of operation.

[0044] It should be noted here that the circulation pipeline, the secondary circulation pump 2, the circulation water preheating pump 3 and the preheater 4 are all configured according to the maximum power low-speed engine test requirements of the test bench. The present application does not make specific limitations here. Moreover, before the test of different power low-speed engines, the circulation water flow into the supercharged air cooler can be adjusted by observing the flow meters 5 and automatically or manually controlling the electric valve gate to meet the requirements of the corresponding test engine model.

[0045] In order to better regulate the circulation water temperature in the circulation cooling water temperature control system of the supercharged air cooler for the low-speed engine test bench, an electric three-way temperature control regulating valve 7 is connected between the cooling water feed pipeline 14 and the return bypass pipeline 17. The electric three-way temperature control regulating valve 7 has two inlets and one outlet, one of which is connected to the cooling water feed from the external circulation cooling water feed pipeline, and the other is connected to the cooling water return from the return bypass pipeline 17. During the test of the low-speed engine, when the temperature of the external circulation water feed is lower than the minimum inlet temperature of the circulation water of the supercharged air cooler of the low-speed engine, the electric three-way temperature control regulating valve 7 starts to work and mixes part of the cooling water return with the cooling water feed. By changing the relative flow ratio between the two inlets, the temperature of the mixed water can be accurately adjusted, and then part of the circulation cooling water return is mixed with the external circulation cooling water feed through the electric three-way temperature control regulating valve 7, the temperature of the mixed external circulation cooling water feed is detected by the temperature sensor, and the opening degree of the electric three-way temperature control valve is further controlled, thereby realizing the real-time regulation of the inlet temperature of the circulation water of the supercharged air cooler.

[0046] Through setting temperature sensors at various pipelines, the cooling water supply temperature t1 at the outer circulation cooling water supply, the mixed water temperature t5 after the electric three-way temperature control regulating valve 7, the cooling water temperature t6 after the preheating of the circulation water preheating pipeline 21, the cooling water temperature t3 input into the turbocharger air cooler, the return water temperature t4 from the turbocharger air cooler, the return water temperature t2 after being delivered into the return water bypass pipeline 17 through the cooling water return pipeline 16 can be obtained, so that the water temperatures at various positions in the cooling water circulation system can be monitored in all directions.

[0047] In a possible implementation, the circulation cooling water temperature control system of the turbocharger air cooler for the low-speed engine test bench further comprises a control unit. The control unit can remotely transmit the outer circulation cooling water supply temperature, flow, pressure of the circulation cooling water temperature control system of the turbocharger air cooler for the low-speed engine test bench, and the start-stop of the secondary circulation pump 2 and the circulation water preheating pump 3, the state of the electric three-way temperature control regulating valve 7, and the opening degree data of the first electric gate valve 8, the second electric gate valve 9, and the third electric gate valve 13 to the auxiliary machine system control room, so that the start-stop of the secondary circulation pump 2, the circulation water preheating pump 3, and the preheater 4 can be controlled in the control room or on site, the opening degree or start-stop of the electric gate valve can be automatically adjusted according to different engine types in the control room or on site, the real-time monitoring data can be displayed, and the prompting and alarming functions can be realized. The control unit can realize the automatic control of the flow and temperature of the turbocharger air cooler circulation water inlet.

[0048] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A supercharged air cooler circulating cooling water system for a low-speed engine test bed, characterized in that: The application relates to a cooling water supply pipe (14) connected with an outer circulating cooling water supply pipe and a supercharged air cooler circulating water inlet; a cooling water return pipe (16) connected with a supercharged air cooler circulating water outlet and an outer circulating cooling water return pipe; a return bypass pipe (17) with one end communicated to the cooling water supply pipe (14) near the outer circulating cooling water supply pipe and the other end communicated to the cooling water return pipe (16) near the outer circulating cooling water return pipe; wherein the cooling water supply pipe (14) is communicated with the return bypass pipe (17) through an electric three-way temperature control regulating valve (7), a secondary circulating pump (2) is arranged behind the electric three-way temperature control regulating valve (7), and the mixing ratio of cooling water supply and cooling water return is changed by adjusting the interface opening degree of the electric three-way temperature control regulating valve (7), the return bypass pipe (17) and the cooling water supply pipe (14). The cooling water supply pipe (14) is provided with a flowmeter (5) near the supercharged air cooler circulating water inlet. The cooling water return pipe (16) is provided with a supercharged air cooler circulating water outlet temperature sensor (12) near the supercharged air cooler circulating water outlet. The cooling water return pipe (16) is provided with a third electric gate valve (13) near the outer circulating cooling water return pipe. The cooling water supply pipe (14) is provided with a secondary circulating module (23), and the secondary circulating 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).

2. The turbocharger air-cooled intercooler water cooling system for a low-speed engine test bed according to claim 1, characterized in that: The first water supply sub-pipe (18) is provided with a first electric gate valve (8), and the second water supply sub-pipe (19) and the third water supply sub-pipe (20) are provided with filters (1) and secondary circulating pumps (2).

3. The turbocharger air-to-air aftercooler circulating cooling water system for a low speed engine test cell of claim 1, wherein: The application further comprises a water supply bypass pipe (15) with one end communicated to the cooling water supply pipe (14) near the supercharged air cooler circulating water inlet and the other end communicated to the cooling water return pipe (16) near the supercharged air cooler circulating water outlet.

4. The turbocharger air-to-air cooler circulating cooling water system for a low speed engine test cell of claim 1, wherein: The cooling water supply pipe (14) is provided with a circulating water preheating module (24), and the circulating water preheating module (24) comprises a circulating water preheating pipeline (21) and a fourth water supply sub-pipe (22) branched from the cooling water supply pipe (14), the circulating water preheating pipeline (21) is provided with a circulating water preheating pump (3) and a preheater (4), and the fourth water supply sub-pipe (22) is provided with a second electric gate valve (9).

5. The supercharged air cooler circulating cooling water system for a low-speed engine test bed according to any one of claims 1 to 4, characterized in that: ​ 6. The turbocharger air-to-air intercooler cooling system for a low speed engine test cell of claim 5, wherein: ​ 7. The turbocharger air-to-air intercooler cooling system for a low speed engine test cell of claim 6, wherein: ​ 8. The turbocharger air-to-air aftercooler circulating cooling water system for a low speed engine test cell of any one of claims 1-4, characterized in that: ​

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