Automatic temperature control system for cooling water of cylinder sleeve of ship main diesel engine

Abstract

The invention discloses a ship main diesel engine cylinder sleeve cooling water automatic temperature control system which comprises a liquid discharge pipeline and a liquid inlet pipeline, and further comprises a cooling water temperature control mechanism communicating with the liquid discharge pipeline and the liquid inlet pipeline. Wherein the cooling water temperature control mechanism comprises a shell, two circulation cavities formed in an inner cavity of the shell, two liquid discharging branch pipes and two liquid outlet branch pipes which are communicated with the two circulation cavities respectively, a conversion valve arranged in the shell and located between the circulation cavities and the liquid outlet branch pipes, and electromagnetic valves arranged in the liquid discharging branch pipes, and water temperature adjusting mechanisms are further arranged in the circulation cavities. Cooling water with abnormal temperature can return to the circulation cavity, the temperature is adjusted to be normal through the water temperature adjusting mechanism, cooling water in the other circulation cavity is recycled, it is ensured that the diesel engine works in the optimal temperature interval all the time, efficiency reduction or mechanical damage caused by temperature fluctuation is avoided, and the service life of the diesel engine is prolonged. The cooling process does not need to be interrupted during switching, and use is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of cooling water temperature control, in particular to an automatic temperature control system for cooling water of a cylinder liner of a main diesel engine of a ship. Background Art

[0002] The cylinder liner cooling water temperature of the ship's main diesel engine is an important thermal parameter. If the cylinder liner cooling water temperature of the ship's main diesel engine is too high, it will accelerate the aging of the lubricating oil and accelerate the wear of parts; if the cooling water temperature is too low, the acid radicals in the fuel gas will combine with water to generate acidic substances, which will increase the wear of the cylinder. The quality of the cylinder liner cooling water temperature control directly affects the working condition of the diesel engine.

[0003] Currently, when the temperature of the cylinder liner cooling water of a ship's main diesel engine is abnormal (too high or too low), the abnormally high cooling water is usually passed through a heating or cooling device to adjust the temperature. However, this method has the following drawbacks: cooling interruptions (temporarily losing the cooling medium supply to the diesel engine cylinder liner, resulting in a cooling window lasting several seconds to several minutes) are prone to occur during the temperature adjustment process, affecting the cooling effect of the cooling water on the ship's main diesel engine cylinder liner and, in turn, affecting the stable operation of the ship's main diesel engine. Furthermore, the system requires the installation of an independent heating or cooling device, increasing energy consumption and operating costs. Therefore, we propose an automatic temperature control system for the cylinder liner cooling water of a ship's main diesel engine. Summary of the Invention

[0004] The object of the present invention is to provide an automatic temperature control system for cylinder jacket cooling water of a main diesel engine of a ship, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An automatic temperature control system for cooling water of a cylinder liner of a main diesel engine of a ship, comprising a liquid discharge pipe and a liquid inlet pipe respectively connected to a liquid outlet end and a liquid inlet end of the cylinder liner of the main diesel engine, a circulating pump being provided on the liquid inlet pipe, and a cooling water temperature control mechanism connected to the liquid discharge pipe and the liquid inlet pipe; Among them, the cooling water temperature control mechanism includes: a shell, two flow chambers opened in the inner cavity of the shell, two drainage branches and two outlet branches connecting the two flow chambers respectively, a conversion valve component arranged in the shell and located between the flow chamber and the outlet branch, a temperature sensor 1 arranged on the drain pipe, and an electromagnetic valve arranged in the drain branch. A water temperature regulating mechanism is also provided in the flow chamber. The cooling water in one flow chamber enters the main diesel engine cylinder liner through the corresponding outlet branch and the inlet pipe, and then flows back to the flow chamber through the drain pipe and the corresponding drain branch to form a circulation. The temperature sensor 1 detects the temperature of the cooling water flowing in the drain pipe, and controls the conversion valve component to work when its temperature is lower than or higher than a preset threshold value, so that the cooling water in the other flow chamber is extracted for circulation, and the cooling water flowing back to the original flow chamber is adjusted in temperature through the water temperature regulating mechanism.

[0006] A further improvement is that the conversion valve component includes a cavity opened in the shell and located below the circulation cavity, a sealing disk rotatably arranged in the cavity and driven to rotate by a driving device, and an inlet opened on the sealing disk, and a discharge port connected to the cavity is opened at the bottom of the circulation cavity, wherein the discharge port of a circulation cavity and the liquid outlet branch corresponding to the circulation cavity are both connected to the inlet.

[0007] A further improvement is that the water temperature regulating mechanism includes a temperature regulating fluid portion, a fluid discharge pipe and two heat exchange elements respectively arranged in the two flow cavities, one end of the two heat exchange elements are connected to the temperature regulating fluid portion, and the other end are connected to the fluid discharge pipe.

[0008] A further improvement is that the temperature-regulating fluid portion includes two inlet pipes respectively connected to the two heat exchange elements, both of which pass through the side wall of the shell and are connected to a main pipe, and the main pipe is connected to a flue gas inlet pipe and a seawater inlet pipe. Both the flue gas inlet pipe and the seawater inlet pipe are provided with valve bodies, and the other end of the flue gas inlet pipe is used to be connected to the exhaust end of the main diesel engine. A gas filter and a fan are sequentially provided on the flue gas inlet pipe, and the other end of the seawater inlet pipe extends to below the sea surface and draws seawater through a provided pump body.

[0009] A further improvement is that the heat exchange element includes a hollow heat exchange column arranged in the circulation cavity, hollow tubes arranged at both ends of the hollow heat exchange column and connected to the hollow heat exchange column, and several groups of heat conduction plates inserted into the circumferential outer wall of the hollow heat exchange column, one end of the hollow tube is rotatably connected to the inlet pipe, the other hollow tube passes through the top of the shell and is rotatably connected to the connecting shell, the connecting shell is connected to the fluid discharge pipe through a pipeline, and the other hollow tube is transmission-connected to the rotating device arranged on the shell and is driven to rotate by the rotating device.

[0010] A further improvement is that a friction plate is movably provided inside the heat conduction plate, a gear ring is rotatably provided on the top inner wall of the circulation chamber, several groups of through holes are penetrated by the gear ring and the top inner wall of the circulation chamber, the friction plate and the gear ring are both transmission-connected with a driving part, a temperature sensor three is provided in the circulation chamber, the temperature sensor three is used to detect the cooling water temperature in the circulation chamber, and control the operation of the driving part according to the cooling water temperature.

[0011] A further improvement is that the driving part includes a contact rod connected to the friction plate, one end of the contact rod passes through the heat conducting plate and extends into the hollow heat exchange column, a reset elastic member is provided at the connection between the contact rod and the heat conducting plate, the inner end of the contact rod abuts against a contact column, and the upper end of the circumferential outer wall of the contact column is provided with several groups of arc blocks for driving the contact rod to move, the contact column is provided at one end of the movable rod, and the other end of the movable rod passes through the hollow tube and the connecting shell and is connected to the output end of the telescopic device, a threaded sleeve is rotatably provided on the connecting shell, the threaded sleeve is threadedly sleeved on the outer wall of the movable rod, the threaded sleeve is connected to the gear ring through a transmission member, and when the telescopic device drives the movable rod upward to a preset position, the threaded sleeve drives the gear ring to rotate through the transmission member, and causes the contact rod to move below the arc block.

[0012] A further improvement is that a waterproof and breathable membrane is provided in the through hole.

[0013] A further improvement is that a water level sensor for detecting the water level in the circulation chamber and electrically connected to an external controller is provided in the circulation chamber. When the water level in the circulation chamber is at a preset height, the external controller controls the solenoid valve in the drainage branch pipe connected to the circulation chamber to close, the temperature sensor three in the circulation chamber to open, and the solenoid valve in another drainage branch pipe to open.

[0014] A further improvement is that a second temperature sensor and a heater electrically connected to an external controller are also provided on the flue gas inlet pipe. The second temperature sensor is used to detect the flue gas temperature and enable the external controller to adjust the heater temperature according to the flue gas temperature.

[0015] Compared with the prior art, the present invention has the following beneficial effects: When the cooling water temperature is abnormal, the present invention can return the abnormally-temperature cooling water to its circulation chamber and adjust the temperature to normal through the water temperature regulating mechanism, and the cooling water in the other circulation chamber can be recycled, ensuring that the diesel engine always operates in the optimal temperature range, avoiding efficiency reduction or mechanical damage caused by temperature fluctuations. There is no need to interrupt the cooling process during switching, achieving a seamless transition and being easy to use. It ensures that the cooling water of suitable temperature continues to effectively cool the cylinder liner of the ship's main diesel engine, and also ensures the stable operation of the main diesel engine. The water temperature regulating mechanism of the present invention adopts flue gas and seawater to regulate the abnormally-temperature cooling water in the circulation chamber, which greatly reduces the dependence on external heating / cooling equipment, reduces electricity or fuel consumption and usage costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cooling water automatic temperature control system of the present invention; Figure 2 Schematic diagram of the cooling water temperature control mechanism in the present invention; Figure 3 For the present invention Figure 2Schematic diagram of another perspective structure; Figure 4 Cross-sectional view of the cooling water temperature control mechanism structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of structure A in; Figure 6 Schematic diagram of the heat exchange component structure in the cooling water temperature control mechanism of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the local structure in.

[0017] In the figure: 100, main diesel engine cylinder liner; 200, drain pipe; 300, temperature sensor I; 400, inlet pipe; 500, circulation pump; 600, cooling water temperature control mechanism; 601, housing; 602, flow cavity; 603, drain branch pipe; 604, outlet branch pipe; 605, friction plate; 606, sealing disc; 607, through inlet; 608, hollow heat exchange column; 609, temperature control fluid part; 6091, flue gas inlet pipe; 6092, seawater inlet pipe; 6093, pump body; 6094, heater; 6095, fan; 6096, gas filter; 6097, temperature sensor II; 610, fluid discharge pipe; 611, heat conduction plate; 612, hollow pipe; 613, connecting shell; 614, telescopic device; 615, movable rod; 616, threaded sleeve; 617, contact rod; 618, toothed ring; 619, through hole; 620, temperature sensor III; 621, solenoid valve; 622, contact column; 623, arc-shaped block. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1 Please refer to the attached Figure 1-4 , a ship main diesel engine cylinder liner cooling water automatic temperature control system, including a drain pipe 200 and an inlet pipe 400 respectively connected to the liquid outlet end and the liquid inlet end of the main diesel engine cylinder liner 100. A circulation pump 500 is provided on the inlet pipe 400, and it further includes a cooling water temperature control mechanism 600 connecting the drain pipe 200 and the inlet pipe 400; Through the circulating pump 500, the cooling water in the cooling water temperature control mechanism 600 can be introduced into the main diesel engine cylinder liner 100 through the liquid inlet pipeline 400, and then the cooling water is discharged back to the cooling water temperature control mechanism 600 through the liquid discharge pipeline 200, so as to circulate the cooling water; Among them, the cooling water temperature control mechanism 600 includes: a housing 601, two flow cavities 602 opened in the inner cavity of the housing 601, two liquid discharge branch pipes 603 and two liquid outlet branch pipes 604 respectively communicating with the upper and lower ends of the two flow cavities 602, a switching valve member arranged in the housing 601 and located between the flow cavity 602 and the liquid outlet branch pipe 604, a first temperature sensor 300 arranged on the liquid discharge pipeline 200, and a solenoid valve 621 arranged in the liquid discharge branch pipe 603. By opening the solenoid valve 621 in the corresponding liquid discharge branch pipe 603, the cooling water discharged from the liquid discharge pipeline 200 can enter the corresponding flow cavity 602. It should be noted that when the solenoid valve 621 in one liquid discharge pipeline 200 is opened, the solenoid valve 621 in the other liquid discharge pipeline 200 should be closed. A water temperature adjustment mechanism is also arranged in the flow cavity 602; The cooling water in one flow cavity 602 enters the main diesel engine cylinder liner 100 through the corresponding liquid outlet branch pipe 604 and the liquid inlet pipeline 400, and then flows back to this flow cavity 602 through the liquid discharge pipeline 200 and the corresponding liquid discharge branch pipe 603 to form a cycle. The first temperature sensor 300 detects the temperature of the cooling water flowing in the liquid discharge pipeline 200, and controls the switching valve member to work when its temperature is lower than or higher than the preset threshold, so that the cooling water in the other flow cavity 602 is pumped out for circulation. The cooling water flowing back to the original flow cavity 602 is adjusted in temperature by the water temperature adjustment mechanism. By the above method, the following advantages are achieved. When the cooling water temperature is abnormal (the cooling water temperature is higher / lower than the preset threshold), the cooling water with abnormal temperature can return to its flow cavity 602 and be adjusted to normal temperature by the water temperature adjustment mechanism, and the cooling water in the other flow cavity 602 is switched for circulation use, ensuring that the diesel engine always works in the optimal temperature range, avoiding efficiency reduction or mechanical damage caused by temperature fluctuations. During the switching, there is no need to interrupt the cooling process, realizing seamless transition and being convenient to use.

[0020] Preferably, the switching valve member of this embodiment includes a circular cavity opened in the housing 601 and located below the flow cavity 602, a sealing disc 606 rotatably arranged in the cavity and driven by a driving device (such as a motor) to rotate, and an access port 607 opened on the sealing disc 606. A discharge port communicating with the cavity is opened at the bottom of the flow cavity 602. The discharge port of one flow cavity 602 and the corresponding liquid outlet branch pipe 604 are both communicated with the access port 607; The first temperature sensor 300 and the driving device are both specifically electrically connected to an external controller for attachment Figure 3As shown in the figure, when the cooling water in the left circulation chamber 602 is recycled, when the temperature sensor 300 detects that the temperature of the recycled cooling water is abnormal, it sends a signal to an external controller, and the external controller controls the driving device to drive the sealing plate 606 to rotate a preset angle (180 degrees), so that the inlet 607 on the sealing plate 606 corresponds to the liquid outlet branch pipe 604 and the discharge port corresponding to the right circulation chamber 602. At this time, the left circulation chamber 602 is closed and the cooling water cannot be discharged. Furthermore, the cooling water in the right circulation chamber 602 is pumped out by the circulation pump 500 for use, and the cooling water with abnormal temperature returns to the left circulation chamber 602 and is adjusted in temperature through the water temperature adjustment mechanism inside it until the temperature returns to normal. In this way, when the temperature of the cooling water is abnormal, the circulation path is automatically switched to use the cooling water with suitable temperature to ensure that the diesel engine always operates in the optimal temperature range.

[0021] Embodiment 2 Please refer to the appendix Figure 1-7 , on the basis of Embodiment 1, the water temperature adjustment mechanism of this embodiment includes a temperature adjustment fluid part 609, a fluid discharge pipe 610, and two heat exchange parts respectively arranged in the two circulation chambers 602. One ends of the two heat exchange parts are both connected to the temperature adjustment fluid part 609, and the other ends are both connected to the fluid discharge pipe 610. The fluid discharge pipe 610 is used to supply flue gas or seawater. The other end of the fluid discharge pipe 610 can be connected to the exhaust pipe and the drain pipe through a three-way valve, which is convenient for discharging flue gas and seawater respectively; Preferably, the temperature adjustment fluid part 609 of this embodiment includes two inlet pipes respectively connected to the two heat exchange parts. Both inlet pipes penetrate the side wall of the housing 601 and are connected to a main pipe. Control valves are also arranged on the inlet pipes to control the fluid (flue gas or seawater) to enter the corresponding heat exchange parts. A flue gas inlet pipeline 6091 and a seawater inlet pipeline 6092 are connected to the main pipe. Valves are arranged in both the flue gas inlet pipeline 6091 and the seawater inlet pipeline 6092, which are convenient for controlling the flue gas or seawater to enter the main pipe. The other end of the flue gas inlet pipeline 6091 is used to connect to the exhaust end of the main diesel engine. When the main diesel engine is in use, it will discharge flue gas with a certain temperature, and the cooling water can be heated by the temperature of the flue gas when the temperature of the cooling water is lower than the threshold value. A gas filter 6096 and a fan 6095 are arranged in sequence on the flue gas inlet pipeline 6091. The gas filter 6096 is used to filter the flue gas to prevent the flue gas from containing particulate matter and other substances from blocking the pipeline, etc. The other end of the seawater inlet pipeline 6092 extends below the sea surface and seawater is pumped by the arranged pump body 6093. The cooling water can be cooled by the temperature of the seawater when the temperature of the cooling water is higher than the threshold value. Using seawater and flue gas to adjust the temperature of the cooling water can greatly reduce the dependence on external heating / cooling equipment, reduce the consumption of electric energy or fuel, and at the same time reduce the use cost; Furthermore, the exhaust end of the main diesel engine can be connected to an external waste heat utilization mechanism (such as a boiler, etc.) through a pipeline, so that the flue gas generated by the main diesel engine can be discharged normally when there is no need to use flue gas to adjust the temperature of the cooling water.

[0022] As a preference, the heat exchange element of this embodiment includes a hollow heat exchange column 608 provided in the circulation cavity 602, a hollow tube 612 provided at both ends of the hollow heat exchange column 608 and connected to the hollow heat exchange column 608, and a plurality of groups of heat conducting plates 611 inserted into the outer wall of the circumference of the hollow heat exchange column 608. The hollow heat exchange column 608 and the heat conducting plates 611 are preferably made of metal materials. One end of the heat conducting plate 611 is placed in the inner cavity of the hollow heat exchange column 608, and one end of a hollow tube 612 is rotatably connected to the inlet pipe (for example, The other hollow tube 612 penetrates the top of the housing 601 and is rotatably connected to the communication housing 613 (e.g., rotatably connected via a bearing). The communication housing 613 can be mounted on the top of the housing 601 via a bracket. The communication housing 613 is connected to the fluid discharge pipe 610 via a pipeline. The other hollow tube 612 is in transmission connection with a rotating device (e.g., a motor and a sprocket, chain, or other structure that transmits transmission between the motor output end and the hollow tube 612) disposed on the housing 601 and is driven to rotate by the rotating device. Attach Figure 3 As shown, when cooling water with abnormal temperature is in the left circulation cavity 602, if the temperature of the cooling water is higher than a preset threshold, the control valve in the corresponding inlet pipe and the valve body in the seawater inlet pipe 6092 are opened, and the pump body 6093 is opened to extract seawater, so that the seawater enters the hollow heat exchange column 608 in the left circulation cavity 602. The hollow heat exchange column 608 and the heat conducting plate 611 exchange heat between the temperature of the seawater and the cooling water in the circulation cavity 602. After the heat exchange, the seawater is discharged from the fluid discharge pipe 610, so that the temperature of the cooling water drops until until the cooling water temperature returns to normal; if the cooling water temperature is lower than the preset threshold, the control valve in the corresponding inlet pipe and the valve body in the flue gas inlet pipe 6091 are opened, and the fan 6095 is turned on, so that the flue gas generated by the main diesel engine enters the hollow heat exchange column 608 in the left circulation chamber 602. The hollow heat exchange column 608 and the heat conducting plate 611 exchange heat between the flue gas temperature and the cooling water in the circulation chamber 602. After the heat exchange, the flue gas is discharged from the fluid discharge pipe 610, causing the cooling water temperature to rise until the cooling water temperature returns to normal; In the above, the rotating device can be turned on to drive the hollow heat exchange column 608 to rotate. The hollow heat exchange column 608 rotates through the heat conduction plate 611 so that the cooling water in the flow cavity 602 is evenly contacted with the fluid flowing in the hollow heat exchange column 608 for heat exchange, thereby improving the temperature control efficiency of the cooling water.

[0023] Preferably, a friction plate 605 is movably arranged inside the heat conduction plate 611 in this embodiment. The friction plate 605 is preferably made of a metal material. The outer wall of the friction plate 605 is attached to the inner wall of the heat conduction plate 611. A toothed ring 618 is rotatably arranged on the inner wall of the top of the circulation cavity 602 through a bearing. A plurality of groups of through holes 619 penetrate through both the toothed ring 618 and the inner wall of the top of the circulation cavity 602. A waterproof and breathable film is arranged in the through holes 619. Through the waterproof and breathable film, the cooling water in the circulation cavity 602 cannot be discharged from the through holes 619, but the gas in the circulation cavity 602 can be discharged or the external gas can enter the circulation cavity 602. Both the friction plate 605 and the toothed ring 618 are connected to a driving part in a transmission manner. A third temperature sensor 620 electrically connected to the driving part is arranged in the circulation cavity 602. The third temperature sensor 620 is used to detect the temperature of the cooling water in the circulation cavity 602 and control the operation of the driving part according to the temperature of the cooling water. For example, when the third temperature sensor 620 detects that the temperature of the cooling water is lower than a preset threshold, the driving part drives the friction plate 605 to intermittently move relative to the heat conduction plate 611, thereby generating frictional heat. Combined with the introduced flue gas, the heating efficiency of the internal cooling water is improved; when the third temperature sensor 620 detects that the temperature of the cooling water is higher than the preset threshold, the driving part drives the toothed ring 618 to rotate so that the through holes 619 on the toothed ring 618 coincide with the through holes 619 on the inner wall of the top of the circulation cavity 602, forming a fast heat dissipation channel communicating with the outside, so that the heat generated by the cooling water in the circulation cavity 602 can be discharged outward through the through holes 619. Combined with the introduced seawater, the cooling efficiency of the internal cooling water is improved, and at this time, the friction plate 605 does not move relative to the heat conduction plate 611. The above-mentioned third temperature sensor 620 is electrically connected to an external controller.

[0024] Preferably, the driving part of this embodiment includes a contact rod 617 connected to the friction plate 605. One end of the contact rod 617 penetrates through the heat conducting plate 611 and extends into the hollow heat exchange column 608. A reset elastic member (such as a spring) is provided at the connection between the contact rod 617 and the heat conducting plate 611. One end of the reset elastic member is connected to the contact rod 617, and the other end is connected to the heat conducting plate 611. A contact column 622 abuts against the inner end of the contact rod 617. The axes of the contact rod 617 and the contact column 622 are perpendicular to each other. A ball can be embedded at the inner end of the contact rod 617 to contact the circumferential outer wall of the contact column 622. Several groups of arc-shaped blocks 623 for driving the contact rod 617 to move are provided at the upper end of the circumferential outer wall of the contact column 622. When the contact column 622 corresponds to the upper end of the outer wall of the contact column 622, the contact rod 617 can be intermittently moved outward through the arc-shaped blocks 623. Then, the contact rod 617 drives the friction plate 605 to move and rub in the heat conducting plate 611 to generate heat. The contact column 622 is provided at one end of the movable rod 615. The other end of the movable rod 615 passes through the hollow tube 612 and penetrates through the communication shell 613 and is connected to the output end of the telescopic device 614 (such as an electric telescopic rod, etc.). A threaded sleeve 616 is rotatably provided on the communication shell 613 through a bearing. The threaded sleeve 616 is threadedly sleeved on the outer wall of the movable rod 615. External threads adapted to the threaded sleeve 616 are provided on the outer wall of the movable rod 615. The threaded sleeve 616 is drivingly connected to the toothed ring 618 through a transmission member. The transmission member includes, for example, a shaft portion inserted into the top of the housing 601 and located inside the toothed ring 618. A gear meshing with the toothed ring 618 is sleeved at one end of the shaft portion, and the other end is drivingly connected to the threaded sleeve 616 through a sprocket transmission group (including a chain and sprockets). When the telescopic device 614 drives the movable rod 615 upward to a preset position, the threaded sleeve 616 drives the toothed ring 618 to rotate through the transmission member, and the contact rod 617 is moved to below the arc-shaped blocks 623; When the telescopic device 614 does not drive the movable rod 615 to move upward, the through holes 619 on the gear are offset from the through holes 619 on the inner wall of the top of the flow cavity 602. At this time, the heat in the flow cavity 602 will not be discharged from the through holes 619, and at this time, the arc-shaped blocks 623 correspond to the contact rod 617. Therefore, when the hollow heat exchange column 608 rotates, the hollow heat exchange column 608 rotates relative to the movable rod 615. Under the action of the arc-shaped blocks 623, the contact rod 617 drives the friction plate 605 to move and rub in the heat conducting plate 611 to generate heat; when the telescopic device 614 drives the movable rod 615 upward to a preset position, the movable rod 615 drives the threaded sleeve 616 to rotate. Then, the threaded sleeve 616 makes the toothed ring 618 rotate. At this time, the through holes 619 on the gear coincide with the through holes 619 on the inner wall of the top of the flow cavity 602, and the contact rod 617 is moved to below the arc-shaped blocks 623. When the hollow heat exchange column 608 rotates, the friction plate 605 will not be moved in the heat conducting plate 611 through the arc-shaped blocks 623.

[0025] Preferably, a water level sensor for detecting the water level in the flow-through cavity 602 and electrically connected to an external controller is further provided in the flow-through cavity 602 of this embodiment. When the water level in the flow-through cavity 602 reaches a preset height, the external controller controls the solenoid valve 621 in the drain branch pipe 603 communicating with the flow-through cavity 602 to close, the temperature sensor III 620 in the flow-through cavity 602 to turn on, and the solenoid valve 621 in the other drain branch pipe 603 to open; As attached Figure 3 As shown, if the temperature of the cooling water in the left flow-through cavity 602 is abnormal, it will enter the left flow-through cavity 602 through the drain branch pipe 603 communicating with it. As the cooling water with abnormal temperature enters the left flow-through cavity 602, the water level sensor in the left flow-through cavity 602 detects the water level. When the preset water level height is reached, the water level sensor sends a signal to the external controller. The external controller controls the solenoid valve 621 in the left drain branch pipe 603 to close, so that the cooling water will not continue to enter the left drain branch pipe 603, and the solenoid valve 621 in the right drain branch pipe 603 is opened, so that the subsequent cooling water discharged from the drain pipeline 200 enters the right flow-through cavity 602. And it also controls the temperature sensor III 620 in the left flow-through cavity 602 to work. When the water level in the flow-through cavity 602 is lower than the preset height, the temperature sensor III 620 does not work, and when the water level reaches the preset height, the temperature sensor III 620 works to better detect the water temperature in the auxiliary flow-through cavity 602 to return to the normal temperature.

[0026] Preferably, a temperature sensor II 6097 and a heater 6094 electrically connected to an external controller are further provided on the flue gas inlet pipeline 6091 of this embodiment. The temperature sensor II 6097 is used to detect the flue gas temperature and make the external controller adjust the temperature of the heater 6094 according to the flue gas temperature. When the temperature sensor II 6097 detects that the flue gas temperature is insufficient (such as the exhaust temperature is too low during low-load operation of the diesel engine), the controller automatically adjusts the power of the heater 6094 to heat the flue gas to the preset temperature range to ensure the stability of its heating efficiency for the cooling water. This system preferentially utilizes the waste heat of the flue gas, only enables the heater 6094 when necessary, and automatically adjusts the power of the heater 6094 according to the flue gas temperature, effectively reducing the additional energy consumption. The above-mentioned heater 6094 can adopt an electric heating tube heater with adjustable heating power, etc.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic temperature control system for the cylinder jacket cooling water of a ship's main diesel engine, comprising a drain pipe (200) and a feed pipe (400) respectively connected to the liquid outlet end and the liquid inlet end of the cylinder jacket (100) of the main diesel engine. A circulation pump (500) is provided on the feed pipe (400), and it is characterized in that: It further includes a cooling water temperature control mechanism (600) that connects the drain pipe (200) and the inlet pipe (400); Among them, the cooling water temperature control mechanism (600) includes: a housing (601), two flow cavities (602) opened in the inner cavity of the housing (601), two drain branch pipes (603) and two liquid outlet branch pipes (604) respectively connecting the two flow cavities (602), a switching valve member disposed in the housing (601) and located between the flow cavity (602) and the liquid outlet branch pipe (604), a first temperature sensor (300) disposed on the drain pipe (200), and a solenoid valve (621) disposed in the drain branch pipe (603). A water temperature adjustment mechanism is further disposed in the flow cavity (602). The cooling water in one flow cavity (602) enters the main diesel engine cylinder liner (100) through the corresponding liquid outlet branch pipe (604) and the inlet pipe (400), and then flows back to this flow cavity (602) through the drain pipe (200) and the corresponding drain branch pipe (603) to form a cycle. The first temperature sensor (300) detects the temperature of the cooling water flowing in the drain pipe (200), and controls the switching valve member to work when its temperature is lower or higher than the preset threshold, so that the cooling water in the other flow cavity (602) is pumped out for circulation, and the temperature of the cooling water flowing back to the original flow cavity (602) is adjusted by the water temperature adjustment mechanism.

2. The automatic temperature control system for cooling water according to claim 1, characterized in that: The switching valve member includes a cavity opened in the housing (601) and located below the flow cavity (602), a sealing plate (606) rotatably disposed in the cavity and driven by a driving device to rotate, and a through inlet (607) opened on the sealing plate (606). The bottom of the flow cavity (602) is provided with a discharge port communicating with the cavity. The discharge port of one flow cavity (602) and the corresponding liquid outlet branch pipe (604) of this flow cavity (602) are both communicated with the through inlet (607).

3. The automatic temperature control system for cooling water according to claim 1, characterized in that: The water temperature adjustment mechanism includes a temperature adjustment fluid part (609), a fluid discharge pipe (610), and two heat exchange members respectively disposed in the two flow cavities (602). One ends of the two heat exchange members are both communicated with the temperature adjustment fluid part (609), and the other ends are both communicated with the fluid discharge pipe (610).

4. The automatic temperature control system for cooling water according to claim 3, characterized in that: The temperature adjustment fluid part (609) includes two inlet pipes respectively communicated with the two heat exchange members. The two inlet pipes both penetrate through the side wall of the housing (601) and are communicated with a main pipe. A flue gas inlet pipe (6091) and a seawater inlet pipe (6092) are communicated with the main pipe. Valves are disposed in both the flue gas inlet pipe (6091) and the seawater inlet pipe (6092). The other end of the flue gas inlet pipe (6091) is used to connect with the exhaust end of the main diesel engine. A gas filter (6096) and a fan (6095) are sequentially arranged on the flue gas inlet pipe (6091). The other end of the seawater inlet pipe (6092) extends below the sea surface and pumps seawater through a pump body (6093) provided.

5. The automatic temperature control system for cooling water according to claim 4, wherein: The heat exchange element includes a hollow heat exchange column (608) arranged in the circulation cavity (602), hollow tubes (612) arranged at both ends of the hollow heat exchange column (608) and connected to the hollow heat exchange column (608), and a plurality of groups of heat conduction plates (611) inserted into the outer wall of the circumference of the hollow heat exchange column (608). One end of the hollow tube (612) is rotatably connected to the inlet pipe, and the other hollow tube (612) passes through the top of the shell (601) and is rotatably connected to the connecting shell (613). The connecting shell (613) is connected to the fluid discharge pipe (610) through a pipeline. The other hollow tube (612) is transmission-connected to a rotating device arranged on the shell (601) and is driven to rotate by the rotating device.

6. The automatic temperature control system for cooling water according to claim 5, characterized in that: A friction plate (605) is movably provided in the heat conducting plate (611), a gear ring (618) is rotatably provided on the top inner wall of the circulation chamber (602), and a plurality of through holes (619) are penetrated through the gear ring (618) and the top inner wall of the circulation chamber (602). The friction plate (605) and the gear ring (618) are both transmission-connected to a driving part, and a temperature sensor three (620) is provided in the circulation chamber (602). The temperature sensor three (620) is used to detect the temperature of the cooling water in the circulation chamber (602) and control the operation of the driving part according to the cooling water temperature.

7. The automatic temperature control system for cooling water according to claim 6, characterized in that: The driving part includes a contact rod (617) connected to the friction plate (605), one end of the contact rod (617) passes through the heat conducting plate (611) and then extends into the hollow heat exchange column (608), a reset elastic member is provided at the connection between the contact rod (617) and the heat conducting plate (611), the inner end of the contact rod (617) abuts against a contact column (622), and the upper end of the outer circumferential wall of the contact column (622) is provided with a plurality of groups of arc blocks (623) for driving the contact rod (617) to move, the contact column (622) is provided at one end of the movable rod (615), and the other end of the movable rod (615) passes through the hollow The tube (612) passes through the connecting shell (613) and is connected to the output end of the telescopic device (614). A threaded sleeve (616) is rotatably provided on the connecting shell (613). The threaded sleeve (616) is threadedly sleeved on the outer wall of the movable rod (615). The threaded sleeve (616) is connected to the gear ring (618) through a transmission member. When the telescopic device (614) drives the movable rod (615) upward to a preset position, the threaded sleeve (616) drives the gear ring (618) to rotate through the transmission member, and causes the contact rod (617) to move below the arc block (623).

8. The automatic temperature control system for cooling water according to claim 6, wherein: A waterproof and breathable membrane is provided in the through hole (619).

9. The automatic temperature control system for cooling water according to claim 7, wherein: The circulation chamber (602) is further provided with a water level sensor for detecting the water level in the circulation chamber (602) and electrically connected to an external controller. When the water level in the circulation chamber (602) reaches a preset height, the external controller controls the electromagnetic valve (621) in the drainage branch pipe (603) connected to the circulation chamber (602) to close, the temperature sensor 3 (620) in the circulation chamber (602) to open, and the electromagnetic valve (621) in another drainage branch pipe (603) to open.

10. The automatic temperature control system for cooling water according to claim 4, characterized in that: A second temperature sensor (6097) electrically connected to an external controller and a heater (6094) are further provided on the flue gas inlet pipeline (6091). The second temperature sensor (6097) is used to detect the flue gas temperature and enable the external controller to adjust the temperature of the heater (6094) according to the flue gas temperature.

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