A composite plate type external circulation oil cooler

Abstract

The present invention discloses a double-plate external circulation oil cooler, comprising a base, an inlet and outlet water tank, a cooler cylinder, a main tube plate, a secondary tube plate, a return water tank, an exhaust device, and a water leakage alarm device. During operation, the present invention not only includes all the working characteristics of a conventional external circulation oil cooler, but also can effectively monitor the water leakage of the cooling water pipe inside the cooler and the main tube plate expansion joint in real time. The water leakage alarm device is installed inside the tube plate, and when leakage occurs, a leakage signal can be issued in time to facilitate problem solving, thereby effectively preventing safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of temperature reduction and cooling equipment, in particular to a double-plate type external circulation oil cooler. Background Art

[0002] Large generators are one of the main equipment of the national power grid. They are direct producers of electric energy and the most basic power equipment in modern industry. The development of large motors is closely linked to the development of the entire national economy, especially the power industry. The motor is a rotating electric machine that converts electrical energy into mechanical energy. It mainly includes an electromagnet winding or a distributed stator winding for generating a magnetic field and a rotating armature or rotor. Under the action of the rotating magnetic field of the stator winding, current flows through the effective side of the stator winding and is rotated by the magnetic field. According to the principle of motor reversibility, if the motor does not undergo any changes in its structure, the motor can be used as a motor or a generator. It is a machine that converts electrical energy into mechanical energy. Usually, the working part of the motor performs rotational motion, which is called a rotor motor; there are also linear motion motors, which are called linear motors. The power range that the motor can provide is very large, from milliwatts to kilowatts. Machine tools and water pumps need to be driven by electric motors; electric locomotives and elevators need to be pulled by electric motors. Electric fans, refrigerators, washing machines, and even various electric motor toys in family life cannot do without electric motors. Electric motors have been used in all aspects of modern life. Diesel generator sets are small power generation equipment, which refers to power machinery that uses diesel as fuel and a diesel engine as the prime mover to drive the generator to generate electricity. The whole set is generally composed of a diesel engine, a generator, a control box, a fuel tank, a storage battery for starting and control, a protective device, an emergency cabinet and other components. The whole can be fixed on the foundation for positioning and use, or it can be installed on a trailer for mobile use. Diesel generator sets are non-continuous operation power generation equipment. If they run continuously for more than 12 hours, their output power will be about 90% lower than the rated power. Although the power of diesel generator sets is low, they are widely used in mines, railways, field construction sites, road traffic maintenance, as well as factories, enterprises, hospitals and other departments as backup power or temporary power because of their small size, flexibility, lightness, complete supporting facilities and easy operation and maintenance. During the operation of motors and generators, due to the existence of electric current and magnetic field, iron loss and copper loss are bound to occur. This loss is transferred to the winding and iron core in the form of heat, which will cause heat. When designing the equipment, we will take the temperature it can withstand into consideration. In order to prevent it from overheating or overcooling, we often use air coolers in conjunction with it. The air cooler has a good cooling effect throughout the process, which ensures that the heat generated by the unit during the operation of the generator is not particularly high, which not only ensures the normal operation of the unit, but also extends its life.

[0003] There are often copper losses and iron losses when the generator is working. As the generator works, the capacity of the generator becomes larger and larger. The generator will generate a lot of heat when working, and the temperature of the iron core and coil will gradually increase. When the motor unit is running, it generates a lot of heat. High temperature will damage the components of the unit and affect the operation of the generator. In order to extend the service life of the generator, in order to reduce the internal temperature of the generator set, slow down the aging of the metal hose compensator and coil insulation, the temperature of the coil must not exceed a certain standard. Therefore, measures must be taken to take away the heat generated by the coil and the iron core in time to maintain the temperature of the coil insulation within the specified value. Generally, a complete set of air coolers is installed on the outer wall of the stator of large and medium-sized hydroelectric generators, and the number is generally 6 to 16. The air cooler cools the heat inside the generator. Therefore, when the generator is generating electricity, it is necessary to configure a corresponding cooling device to cool the generator to prevent the generator from malfunctioning and extend the service life of the generator.

[0004] When the external circulation oil cooler of the turbine generator is in operation, the hot medium oil enters through the oil inlet on one side of the cylinder and flows to the oil outlet in a zigzag manner in the cylinder. The cold medium water enters through the water inlet and absorbs the waste heat released by the hot medium oil during its flow in the cooling pipe, and then flows to the water outlet for discharge, ultimately achieving the purpose of keeping the working medium at the rated working temperature.

[0005] During the entire operation process, if water leakage occurs at the connection between the two ends of the cooling water pipe inside the cooler and the tube plate, it is difficult to detect in time. If it is not eliminated in time, the cooling water will leak into the oil circuit and then flow into the working medium tank of the turbine generator. This situation not only affects the heat dissipation effect of the turbine generator, but also poses a great threat to the wear of the working medium.

[0006] There are three main reasons for leakage in the external circulation oil cooler:

[0007] (1) Congenital manufacturing quality problems, such as inner wall damage, shrinkage holes, and uneven thickness during copper tube drawing, which cause damage or uneven expansion of the manual expansion tube during oil cooler manufacturing;

[0008] (2) Collision, smashing, and scraping during manufacturing, transportation, maintenance, hoisting, and cleaning, coupled with vibration during operation, lead to acquired mechanical damage and expansion;

[0009] (3) Wear of the cooling medium during use, damage to the pipe wall caused by increased flow rate when the cooler is half blocked and half open, or electrochemical corrosion of copper pipes and dezincification corrosion of brass pipes. In addition, the number and density of cooling pipes in the external circulation oil cooler of the hydro-generator are large, and the numerous and dense leakage sources naturally increase the leakage probability of the external circulation oil cooler.

[0010] If a small amount of water leaks into the oil circuit, it will cause uneven heat conduction in the oil circuit, thus affecting the heat dissipation effect. If a large amount of water leaks into the oil circuit and flows into the working medium oil tank of the turbine generator, it will affect the lubrication effect of the oil, and the harm to the generator is immeasurable. Summary of the invention

[0011] The purpose of the present invention is to provide a double-plate external circulation oil cooler, which, in addition to all the working characteristics of a conventional external circulation oil cooler, can also effectively monitor the water leakage at the connection between the cooling water pipe and the tube plate inside the cooler in real time during the operation of the equipment. A water leakage alarm device is installed inside the tube plate, which can send out a leakage signal in time when leakage occurs, so as to facilitate solving the problem and effectively prevent safety hazards.

[0012] The objective of the present invention is achieved through the following technical solutions: a double-plate external circulation oil cooler, comprising a base, an inlet and outlet water tank, a cooler cylinder, a main tube plate, a secondary tube plate, a return water tank, an exhaust device, and a water leakage alarm device, wherein the inlet and outlet water tanks comprise an inlet pipe, an inlet pipe flange, an outlet pipe, an outlet pipe flange, and a water tank drain hole, and the cooler cylinder comprises a cooling water pipe, an oil inlet pipe, an oil inlet pipe flange, an oil outlet pipe, an oil outlet pipe flange, and a shell oil drain hole, the base is located at the bottom of the external circulation oil cooler, the upper part is provided with an inlet and outlet water tank, the inlet and outlet water tank is located at the upper part of the base, the lower part is provided with a base, the upper part is provided with a main tube plate, the inlet and outlet water tanks are arranged in the middle position between the base and the main tube plate, and the main tube plate is located at the inlet and outlet water tanks. The upper part of the box is provided with an inlet and outlet water tank at the lower part, and the upper part is provided with an auxiliary tube plate. The main tube plate is arranged in the middle position between the inlet and outlet water tank and the auxiliary tube plate. The auxiliary tube plate is located at the upper part of the main tube plate. The lower part is provided with the main tube plate. The upper part is provided with a cooler cylinder. The auxiliary tube plate is arranged in the middle position between the main tube plate and the cooler cylinder. The main tube plate and the auxiliary tube plate are respectively arranged at the upper and lower ends of the cooler cylinder. The cooler cylinder is located in the middle of the external circulation oil cooler. The upper part and the lower part are respectively provided with an auxiliary tube plate and a main tube plate. The return water tank is located at the uppermost part of the external circulation oil cooler. The lower part is provided with a main tube plate. The upper part is provided with an exhaust device. The exhaust device is located at the upper part of the return water tank. The water leakage alarm device is located on the auxiliary tube plate.

[0013] The water inlet and outlet water tank is provided with an inlet pipe, an inlet pipe flange, an outlet pipe, an outlet pipe flange, and a water tank drain hole. The inlet pipe is located on the right part of the water inlet and outlet water tank, the inlet pipe is provided with a flange, the outlet pipe is located on the left part of the water inlet and outlet water tank, the outlet pipe is provided with a flange, and the water tank drain hole is located at the lower part of the water inlet and outlet water tank and the upper part of the base.

[0014] The cooler cylinder is provided with a cooling water pipe, an oil inlet pipe, an oil inlet pipe flange, an oil outlet pipe, an oil outlet pipe flange, and a shell oil drain hole. The oil outlet pipe is located at the lower right part of the cooler cylinder, and the oil outlet pipe is provided with a flange. The cooling water pipe is located inside the cooler cylinder, passes through the auxiliary tube plate and the main tube plate, and is expanded or welded with the main tube plate and the auxiliary tube plate. The oil inlet pipe is located at the upper right part of the cooler cylinder, and the oil inlet pipe is provided with a flange. The shell oil drain hole is arranged at the lower part of the cooler cylinder and the upper part of the auxiliary tube plate.

[0015] The auxiliary tube plate is provided with drainage and oil discharge holes, auxiliary plate type tube plate detection holes, and a water leakage alarm device. The middle part of the auxiliary tube plate is processed into a groove and is assembled and sealed with an O-ring.

[0016] The exhaust device is an automatic exhaust valve or a manual exhaust valve.

[0017] The water leakage alarm device is a linear water leakage alarm device.

[0018] The beneficial technical effects of the present invention are:

[0019] The purpose of the present invention is to provide a double-plate external circulation oil cooler. The water leakage alarm device provided by the present invention is not possessed by conventional hydro-turbine generator external circulation oil coolers, and can well monitor the water leakage in the cooler in real time. Once leakage occurs at the joint between the cooling water pipe of the cooler and the tube plate, the water leakage alarm device will send a signal to the central control room, which is convenient for timely and rapid resolution of the water leakage problem, thereby increasing the operating safety of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a front view structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of the cooler cylinder of the present invention;

[0024] Figure 4 It is a schematic diagram of the tube plate structure of the present invention.

[0025] Reference numerals

[0026] 1. Base, 2. Inlet and outlet water tanks, 3. Cooler cylinder, 4. Cooling water pipe, 5. Auxiliary pipe plate, 6. Main pipe plate, 7. Return water tank, 8. Exhaust device, 9. Water leakage alarm device, 10. O-ring, 11. Water inlet pipe, 12. Water outlet pipe, 13. Oil outlet pipe, 14. Oil inlet pipe, 15. Shell oil drain hole, 16. Water tank drain hole. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a composite plate type external circulation oil cooler comprises a base 1, an inlet and outlet water tank 2, a cooler cylinder 3, a main tube plate 6, an auxiliary tube plate 5, a return water tank 7, an exhaust device 8, and a water leakage alarm device 9, wherein the inlet and outlet water tank 2 comprises an inlet pipe 11, an inlet pipe flange, an outlet pipe 12, an outlet pipe flange, and a water tank drain hole 16, and the cooler cylinder 3 comprises a cooling water pipe 4, an oil inlet pipe 14, an oil inlet pipe flange, an oil outlet pipe 13, an oil outlet pipe flange, and a shell oil drain hole 15, the base 1 is located at the bottom of the external circulation oil cooler, and an inlet and outlet water tank 2 is provided on the upper part, the inlet and outlet water tank 2 is located on the upper part of the base 1, the lower part is provided with the base 1, and the upper part is provided with a main tube plate 6, the inlet and outlet water tank 2 is arranged in the middle position between the base 1 and the main tube plate 6, and the main tube plate 6 is located on the upper part of the inlet and outlet water tank 2 The lower part is provided with an inlet and outlet water tank 2, the upper part is provided with a secondary tube plate 5, the main tube plate 6 is arranged in the middle position between the inlet and outlet water tank 2 and the secondary tube plate 5, the secondary tube plate 5 is located on the upper part of the main tube plate 6, the lower part is provided with a main tube plate 6, the upper part is provided with a cooler cylinder 3, the secondary tube plate 5 is arranged in the middle position between the main tube plate 6 and the cooler cylinder 3, the main tube plate 6 and the secondary tube plate 5 are respectively arranged at the upper and lower ends of the cooler cylinder 3, the cooler cylinder 3 is located in the middle of the external circulation oil cooler, the upper part and the lower part are respectively provided with a secondary tube plate 5 and a main tube plate 6, the return water tank 7 is located at the uppermost part of the external circulation oil cooler, the lower part is provided with a main tube plate 6, the upper part is provided with an exhaust device 8, the exhaust device 8 is located on the upper part of the return water tank 7, and the water leakage alarm device 9 is located on the secondary tube plate 5. The water inlet and outlet water tank 2 is provided with an inlet pipe 11, an inlet pipe flange, an outlet pipe 12, an outlet pipe flange, and a water tank drain hole 16. The inlet pipe 11 is located on the right part of the water inlet and outlet water tank 2, the inlet pipe 11 is provided with a flange, the outlet pipe 12 is located on the left part of the water inlet and outlet water tank 2, the outlet pipe 12 is provided with a flange, and the water tank drain hole 16 is located at the lower part of the water inlet and outlet water tank 2 and the upper part of the base 1. The cooler barrel 3 is provided with a cooling water pipe 4, an oil inlet pipe 14, an oil inlet pipe flange, an oil outlet pipe 13, an oil outlet pipe flange, and a shell oil drain hole 15. The oil outlet pipe 13 is located at the lower right part of the cooler barrel 3, and the oil outlet pipe 13 is provided with a flange. The cooling water pipe 4 is located inside the cooler barrel 3, passes through the secondary tube plate 5 and the main tube plate 6, and is assembled with the main tube plate 6 and the secondary tube plate 5 by expansion connection or welding. The oil inlet pipe 14 is located at the upper right part of the cooler barrel 3, and the oil inlet pipe 14 is provided with a flange. The shell oil drain hole 15 is arranged at the lower part of the cooler barrel 3 and the upper part of the secondary tube plate 5. The secondary tube plate 5 is provided with a water and oil drain hole, a double-plate tube plate detection hole, and a water leakage alarm device 9. The middle part of the secondary tube plate 5 is processed into a groove, and an O-ring 10 is used for assembly and sealing. The exhaust device 8 is an automatic exhaust valve or a manual exhaust valve.The water leakage alarm device 9 is a linear water leakage alarm device.

[0030] Example 2

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the main tube plate 6 and the auxiliary tube plate 5 can be made of Q235 steel, Q345 steel, 304 stainless steel or brass. The middle part of the auxiliary tube plate 5 is processed into a groove. After being assembled with the main tube plate 6, a closed space is formed to isolate the water and oil circuits at the expansion joint of the cooling pipe that is prone to leakage. The sealing method adopts the groove O-ring sealing. At the same time, 2 to 3 holes are opened on the side of the auxiliary tube plate to install the leakage alarm device probe into the closed space and drain water and oil.

[0032] Example 3

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the cooling water pipe 4 can be made of T2 copper, B10 white copper or 304 stainless steel. The assembly method with the main tube plate 6 and the auxiliary tube plate 5 includes expansion joint, welding or expansion joint plus welding.

[0034] Example 4

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the materials of the inlet and outlet water tanks 2 and the return water tank 7 can be Q235 steel, Q345 steel or 304 stainless steel, and the processing methods include plate welding, stamping forming by a stamping machine or whole plate milling forming. The assembly method with the main tube plate 6 and the auxiliary tube plate 5 is bolted, and the sealing method includes sealing gasket sealing, groove O-ring sealing or high-precision water stop groove sealing.

[0036] Example 5

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the cooler barrel 3 can be made of Q235 steel, Q345 steel or 304 stainless steel, and can be made of large diameter seamless pipes or rolled and welded steel plates. During assembly, it can be welded to the auxiliary tube plate 5, or the flange can be welded to the main tube plate 6, the auxiliary tube plate 5, the inlet and outlet water tanks 2 and the return water tank 7 by bolts.

[0038] Example 6

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, if there is water leakage at the connection between the cooling water pipe 4 and the main tube plate 6, water will flow into the groove of the auxiliary tube plate 5, thereby triggering the water leakage alarm device 9.

[0040] Working principle:

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a composite plate type external circulation oil cooler comprises a base 1, an inlet and outlet water tank 2, a cooler cylinder 3, a main tube plate 6, an auxiliary tube plate 5, a return water tank 7, an exhaust device 8, and a water leakage alarm device 9, wherein the inlet and outlet water tank 2 comprises an inlet pipe 11, an inlet pipe flange, an outlet pipe 12, an outlet pipe flange, and a water tank drain hole 16, and the cooler cylinder 3 comprises a cooling water pipe 4, an oil inlet pipe 14, an oil inlet pipe flange, an oil outlet pipe 13, an oil outlet pipe flange, and a shell oil drain hole 15, the base 1 is located at the bottom of the external circulation oil cooler, and an inlet and outlet water tank 2 is provided on the upper part, the inlet and outlet water tank 2 is located on the upper part of the base 1, the lower part is provided with the base 1, and the upper part is provided with a main tube plate 6, the inlet and outlet water tank 2 is arranged in the middle position between the base 1 and the main tube plate 6, and the main tube plate 6 is located on the upper part of the inlet and outlet water tank 2 The lower part is provided with an inlet and outlet water tank 2, the upper part is provided with a secondary tube plate 5, the main tube plate 6 is arranged in the middle position between the inlet and outlet water tank 2 and the secondary tube plate 5, the secondary tube plate 5 is located on the upper part of the main tube plate 6, the lower part is provided with a main tube plate 6, the upper part is provided with a cooler cylinder 3, the secondary tube plate 5 is arranged in the middle position between the main tube plate 6 and the cooler cylinder 3, the main tube plate 6 and the secondary tube plate 5 are respectively arranged at the upper and lower ends of the cooler cylinder 3, the cooler cylinder 3 is located in the middle of the external circulation oil cooler, the upper part and the lower part are respectively provided with a secondary tube plate 5 and a main tube plate 6, the return water tank 7 is located at the uppermost part of the external circulation oil cooler, the lower part is provided with a main tube plate 6, the upper part is provided with an exhaust device 8, the exhaust device 8 is located on the upper part of the return water tank 7, and the water leakage alarm device 9 is located on the secondary tube plate 5. The water inlet and outlet water tank 2 is provided with an inlet pipe 11, an inlet pipe flange, an outlet pipe 12, an outlet pipe flange, and a water tank drain hole. The inlet pipe 11 is located at the right part of the water inlet and outlet water tank 2, the inlet pipe 11 is provided with a flange, the outlet pipe 12 is located at the left part of the water inlet and outlet water tank 2, the outlet pipe 12 is provided with a flange, and the water tank drain hole 16 is located at the lower part of the water inlet and outlet water tank 2 and the upper part of the base 1. The cooler barrel 3 is provided with a cooling water pipe 4, an oil inlet pipe 14, an oil inlet pipe flange, an oil outlet pipe 13, an oil outlet pipe flange, and a shell oil drain hole 15. The oil outlet pipe 13 is located at the lower right part of the cooler barrel 3, and the oil outlet pipe 13 is provided with a flange. The cooling water pipe 4 is located inside the cooler barrel 3, passes through the secondary tube plate 5 and the main tube plate 6, and is assembled with the main tube plate 6 and the secondary tube plate 5 by expansion connection or welding. The oil inlet pipe 14 is located at the upper right part of the cooler barrel 3, and the oil inlet pipe 14 is provided with a flange. The shell oil drain hole 15 is arranged at the lower part of the cooler barrel 3 and the upper part of the secondary tube plate 5. The secondary tube plate 5 is provided with a water and oil drain hole, a double-plate tube plate detection hole, and a water leakage alarm device 9. The middle part of the secondary tube plate 5 is processed into a groove, and an O-ring 10 is used for assembly and sealing. The exhaust device 8 is an automatic exhaust valve or a manual exhaust valve.The water leakage alarm device 9 is a linear water leakage alarm device.

[0042] The main tube plate 6 and the auxiliary tube plate 5 can be made of Q235 steel, Q345 steel, 304 stainless steel or brass. The middle part of the auxiliary tube plate 5 is processed into a groove. After being assembled with the main tube plate 6, a closed space is formed to isolate the water circuit and the oil circuit at the expansion joint of the cooling pipe that is prone to leakage. The sealing method adopts the groove O-ring sealing. At the same time, 2 to 3 holes are opened on the side of the auxiliary tube plate to install the leakage alarm device probe to the closed space and drain water and oil. The cooling water pipe 4 can be made of T2 copper, B10 white copper or 304 stainless steel. The assembly methods with the main tube plate 6 and the auxiliary tube plate 5 include expansion joint, welding or expansion joint plus welding. The inlet and outlet water tank 2 and the return water tank 7 can be made of Q235 steel, Q345 steel or 304 stainless steel, and the processing and forming methods include plate welding, stamping forming by a stamping machine or whole plate milling forming. The assembly method with the main tube plate 6 and the auxiliary tube plate 5 is bolted, and the sealing methods include sealing gasket sealing, groove O-ring sealing or high-precision water stop groove sealing. The cooler barrel 3 can be made of Q235 steel, Q345 steel or 304 stainless steel, and a large diameter seamless pipe can be selected, or it can be made of steel plate rolled and welded. During the assembly process, it can be welded with the auxiliary tube plate 5, or the welding flange can be bolted with the main tube plate 6, the auxiliary tube plate 5, the inlet and outlet water tank 2 and the return water tank 7. If there is water leakage at the connection between the cooling water pipe 4 and the main tube plate 6, the water will flow into the groove of the auxiliary tube plate 5, thereby triggering the water leakage alarm device 9. The present invention can well monitor the water leakage in the cooler in real time. Once the cooling water pipe 4 of the cooler leaks at the expansion joint with the tube plate, the water leakage alarm device 9 will send a signal to the central control room, which is convenient for timely and rapid solution to the water leakage problem, and increases the safety of the motor operation.

[0043] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A double-plate external circulation oil cooler, characterized in that: It includes a base, an inlet and outlet water tank, a cooler cylinder, a main tube plate, an auxiliary tube plate, a return water tank, an exhaust device and a water leakage alarm device, wherein the inlet and outlet water tank includes an inlet pipe, an inlet pipe flange, an outlet pipe, an outlet pipe flange and a water tank drain hole, and the cooler cylinder includes a cooling water pipe, an oil inlet pipe, an oil inlet pipe flange, an oil outlet pipe, an oil outlet pipe flange and a shell oil drain hole. The base is located at the bottom of the external circulation oil cooler, and the upper part of the base is provided with an inlet and outlet water tank, and the upper part of the inlet and outlet water tank is provided with a main tube plate, and the inlet and outlet water tank is arranged in the middle position between the base and the main tube plate, and the main tube plate is located at the upper part of the inlet and outlet water tank, and the upper part of the main tube plate is provided with an auxiliary tube plate, and the main tube plate is arranged between the inlet and outlet water tank and the auxiliary tube plate. The secondary tube plate is located at the upper part of the main tube plate, a cooler cylinder is provided on the upper part of the secondary tube plate, the secondary tube plate is arranged in the middle position between the main tube plate and the cooler cylinder, the main tube plate and the secondary tube plate are arranged at the upper and lower ends of the cooler cylinder respectively, the cooler cylinder is located in the middle part of the external circulation oil cooler, the upper and lower parts of the cooler cylinder are respectively provided with secondary tube plates and main tube plates, the return water tank is located at the uppermost part of the external circulation oil cooler, the lower part of the return water tank is provided with a main tube plate, the upper part of the return water tank is provided with an exhaust device, the water leakage alarm device is located on the secondary tube plate; the water leakage alarm device is a linear water leakage alarm device, and the exhaust device is an automatic exhaust valve or a manual exhaust valve.

2. A double-plate external circulation oil cooler according to claim 1, characterized in that: The water inlet pipe is located at the right part of the water inlet and outlet tanks, and a flange is provided on the water inlet pipe. The water outlet pipe is located at the left part of the water inlet and outlet tanks, and a flange is provided on the water outlet pipe. The water tank drain hole is located at the lower part of the water inlet and outlet tanks.

3. The double-plate external circulation oil cooler according to claim 1, characterized in that: The oil outlet pipe is located at the lower right part of the cooler cylinder, and a flange is provided on the oil outlet pipe; the cooling water pipe is located inside the cooler cylinder, passes through the auxiliary tube plate and the main tube plate, and is expanded or welded to the main tube plate and the auxiliary tube plate; the oil inlet pipe is located at the upper right part of the cooler cylinder, and a flange is provided on the oil inlet pipe, and the shell oil drain hole is arranged at the lower part of the cooler cylinder.

4. The double-plate external circulation oil cooler according to claim 1, characterized in that: The auxiliary tube plate is provided with drainage and oil discharge holes and auxiliary tube plate detection holes. The middle part of the auxiliary tube plate is processed into a groove. The main tube plate and the auxiliary tube plate are assembled and sealed with an O-ring.

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