Nitrogen protection cover of liquid hydrogen cooling motor system

Abstract

The invention relates to the technical field of motor cooling, in particular to a nitrogen protection cover of a liquid hydrogen cooling motor system, which comprises a bottom plate and a cover body, a motor is arranged on the bottom plate, the cover body is detachably connected with the bottom plate in a sealing manner, a sealing cavity is formed in the bottom plate and the cover body, and the motor is located in the sealing cavity. A sealing gasket is arranged between the corresponding connecting positions of the cover body and the bottom plate, when the cover body is installed, the cover body and the bottom plate can exert opposite pressure on the sealing gasket, the cover body and the bottom plate press the sealing gasket tightly, and therefore the connecting positions of the cover body and the bottom plate are sealed. Opposite pressure is applied to the sealing gasket through the cover body and the bottom plate, tight sealing between the cover body and the bottom plate is achieved, the sealing mode is simple and effective, the sealing gasket serves as a component providing the sealing effect, and the sealing effect is achieved while dismounting is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of motor cooling, and in particular to a nitrogen protective cover for a liquid hydrogen cooling motor system. Background Art

[0002] In liquid hydrogen-cooled motor systems, safety protection is a critical link, especially considering the high flammability of hydrogen. In order to ensure the safety of the system, a nitrogen protective cover is usually used to isolate the air and prevent safety accidents caused by hydrogen leakage. The nitrogen protective cover not only provides an inert gas environment, but also plays an explosion-proof role to ensure the safety of operators and equipment. With the advancement of technology, the design of nitrogen protective covers is also constantly improving, striving to achieve better sealing performance, lower costs, and more convenient operation and maintenance. However, in practical applications, many design schemes still have certain limitations, especially in terms of structural complexity, cost control, and ease of operation.

[0003] Some existing nitrogen protection cover designs, such as those described in patent CN116053506A, adopt a split structure and rely on liquid sealing to ensure the sealing of nitrogen. This method not only requires additional equipment such as water pumps and water tanks, increasing manufacturing and operating costs, but also makes the assembly process more complicated, bringing inconvenience to early installation and later maintenance.

[0004] In addition, traditional nitrogen protective covers often do not take into account the operator's needs for monitoring the internal environment and lack effective means of observation, resulting in an inability to intuitively understand the working status of the hydrogen-cooled motor system inside the nitrogen protective cover, which is not conducive to timely discovering potential problems and taking measures. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a nitrogen protective cover for a liquid hydrogen-cooled motor system, aiming to solve one or more problems mentioned in the background technology.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A nitrogen protective cover for a liquid hydrogen cooling motor system comprises: a bottom plate and a cover body, wherein the motor is arranged on the bottom plate, the cover body and the bottom plate are detachably sealed and connected, a sealed chamber is formed between the bottom plate and the cover body, the motor is located in the sealed chamber, a sealing gasket is arranged between the corresponding joints of the cover body and the bottom plate, when the cover body is installed, the cover body and the bottom plate can apply opposite pressures to the sealing gasket, so that the cover body and the bottom plate press the sealing gasket, thereby sealing the joint between the cover body and the bottom plate.

[0008] Furthermore, it also includes a base, which is detachably arranged on the bottom plate, and a cover body which is detachably arranged on the base, and sealing gaskets are arranged between the base and the bottom plate, and between the base and the cover body.

[0009] Furthermore, the bottom plate and the base, and the base and the cover are detachably connected via bolts.

[0010] Furthermore, the cover body includes a box frame and an observation window fixed on the box frame. The observation window is made of a transparent material. A sealing gasket is arranged between the observation window and the box frame. Under the action of the sealing gasket, the observation window and the box frame are sealed and connected.

[0011] Furthermore, the cover body also includes a first side plate fixedly arranged on one side of the box frame, and a liquid hydrogen inlet pipe is arranged on the first side plate, and the liquid hydrogen enters the sealed chamber through the liquid hydrogen inlet pipe.

[0012] Furthermore, it also includes a second side plate, which is fixedly arranged on the other side of the box frame and is provided with a water cooling joint leading to the sealed chamber.

[0013] Furthermore, a suction port assembly is provided on the second side plate, and the suction port assembly can monitor the nitrogen pressure in the sealed chamber and automatically relieve the pressure and exhaust the gas when the nitrogen pressure exceeds a preset value.

[0014] Furthermore, the suction port assembly includes a suction port pipeline connected to the sealed chamber, and a pressure sensor and a pressure relief valve arranged on the suction port pipeline.

[0015] Furthermore, a quick interface is also provided on the first side plate, and the quick interface is communicated with the sealed chamber and connected to the nitrogen gas source.

[0016] The nitrogen protective cover of a liquid hydrogen cooling motor system and its control method described in the present invention have the beneficial effect of: applying opposite pressures to the sealing gasket through the cover body and the base plate, thereby achieving a tight seal between the cover body and the base plate. This sealing method is simple and effective, and the component that provides the sealing effect is the sealing gasket, which provides the sealing effect and is easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an embodiment of the present invention in a combined state;

[0018] Figure 2 is a schematic diagram of a first explosion structure according to an embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of a second explosion structure according to an embodiment of the present invention.

[0020] Explanation of the reference numerals: bottom plate 1, base 2, cover body 3, box frame 31, second side plate 4, draw-out port assembly 5, first gland assembly 6, water-cooling joint 7, observation window 8, quick interface 9, liquid hydrogen inlet pipe 10, first side plate 11, gas hydrogen return pipe 12, first side plate 13. DETAILED DESCRIPTION

[0021] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0024] like Figures 1 to 3 As shown, a nitrogen protective cover for a liquid hydrogen-cooled motor system provided in an embodiment of the present invention comprises a base plate 1 and a cover body 3 arranged on the base plate 1, the cover body 3 is detachably and sealedly connected to the base plate 1 to form a sealed chamber inside the base plate 1 and the cover body 3, and the motor to be cooled is arranged on the base plate 1 and is located in the sealed chamber.

[0025] In order to achieve a sealed connection between the cover body 3 and the base plate 1, a sealing gasket is provided between the corresponding joints of the cover body 3 and the base plate 1. When the cover body 3 is installed, the cover body 3 and the base plate 1 can apply opposite pressures to the sealing gasket, so that the cover body 3 and the base plate 1 press the sealing gasket tightly, thereby achieving a close fit between the cover body 3, the base plate 1 and the sealing gasket, thereby sealing the joint between the cover body 3 and the base plate 1.

[0026] Furthermore, it also includes a base 2, which is detachably arranged on the bottom plate 1, and a cover body 3 is detachably arranged on the base 2. When the base 2 is fixedly arranged on the bottom plate 1, it can be regarded that the cover body 3 is detachably arranged on the bottom plate 1 through the base 2. There are sealing gaskets between the base 2 and the bottom plate 1, and between the base 2 and the cover body 3. The arrangement of the base 2 allows multiple sealing gaskets to be present between the cover body 3 and the bottom plate 1. Multiple sealing gaskets can disperse the pressure on a single sealing gasket, avoid the concentration of force on a single sealing gasket, and help to extend the service life of the sealing gasket. In addition, the presence of multiple sealing gaskets can increase the sealing level and redundancy, and achieve a better sealing effect.

[0027] Furthermore, the bottom plate 1 and the base 2, as well as the base 2 and the cover body 3 are detachably connected by bolts. When the bolts are tightened, the sealing gasket between the bottom plate 1 and the base 2 fits tightly, and the sealing gasket between the base 2 and the cover body 3 fits tightly, thereby achieving sealing.

[0028] Furthermore, in order to enable the operator to monitor the working status of the hydrogen-cooled motor system inside the nitrogen protective cover in real time, an observation window is also provided on the cover body 3, and the observation window is detachably connected to the cover body 3.

[0029] The following is a detailed description of the embodiment of the present application.

[0030] A nitrogen protective cover for a liquid hydrogen-cooled motor system provided in an embodiment of the present invention mainly includes a bottom plate 1, a base 2, a cover body 3, a box frame 31, a second side plate 4, a suction port assembly 5, a second gland assembly 6, a water-cooling joint 7, an observation window 8, a quick interface 9, a liquid hydrogen inlet pipe 10, a first gland assembly 11, a hydrogen return pipe 12 and a first side plate 13.

[0031] The bottom plate 1 is used as a supporting structure to fix the motor and other components. The base 2 is detachably arranged on the bottom plate 1, and the two are connected by bolts, and a sealing gasket is arranged at the connection to ensure the sealing of the connection.

[0032] The cover body 3 includes a box frame 31, which is formed by overlapping and welding a hollow square tube and a steel plate to form an integral structure. The steel plate is a first side plate 13 and a second side plate 4 fixedly set on the box frame 31. The design takes into account the explosion-proof requirements and can still maintain sufficient strength under extreme conditions; the structural design of the nitrogen protective cover ensures that the nitrogen protective cover has sufficient mechanical strength without increasing the material weight and cost. The box frame 31 is connected to the bottom plate 1 and the base 2 by bolts, and a sealing gasket is set at the connection to achieve sealing.

[0033] The second side plate 4 and the first side plate 13 are respectively arranged on both sides of the box frame 31 and are welded to the box frame 31 to achieve sealing. The second side plate 4 is provided with a suction port assembly 5, a second gland assembly 6 and a water cooling joint 7 for the inlet and outlet of cooling water. The first side plate 13 is provided with a quick interface 9, a liquid hydrogen inlet pipe 10, a first gland assembly 11 and a gas hydrogen return pipe 12 for the inlet and outlet of liquid hydrogen and the recovery of hydrogen.

[0034] The extraction port assembly 5 includes an extraction port pipeline connected to the sealed chamber, a pressure sensor and a safety valve arranged on the extraction port pipeline. When the nitrogen pressure in the sealed chamber exceeds a preset value, the safety valve will automatically release pressure and exhaust to maintain a slightly positive pressure state inside to prevent hydrogen leakage from causing safety accidents.

[0035] The cover body 3 also includes an observation window 8 arranged on the box frame 31. The observation window 8 is made of a transparent material and is fixedly arranged on the box frame 31. The observation window 8 is connected to the box frame 31 by bolts, and a sealing gasket is arranged between the observation window 8 and the box frame 31 for sealing, which not only ensures the sealing performance, but also facilitates the operator to observe the working status of the internal hydrogen-cooled motor system in real time.

[0036] During the assembly process, the bottom plate 1 is first fixed at a predetermined position, and then the base 2 is installed on the bottom plate 1, and the bolts are tightened so that the sealing gasket between the base 2 and the bottom plate 1 fits tightly to achieve sealing. Next, the box frame 31 is installed on the base 2 and fixed by threaded connection, while ensuring that the sealing gasket between the box frame 31 and the base 2 fits tightly. Subsequently, the second side plate 4 and the first side plate 13 are installed respectively and welded to the box frame 31. Finally, the observation window 8 and other accessories are installed to complete the assembly of the nitrogen protective cover.

[0037] When in use, liquid hydrogen enters the cooled hydrogen-cooled motor through the liquid hydrogen inlet pipe 10 for cooling, and the hydrogen generated after cooling is discharged through the hydrogen gas return pipe 12. At the same time, cooling water enters the cooled water-cooled motor through the water-cooling joint 7 for cooling, and the cooled water is discharged through another water-cooling joint 7. Nitrogen is filled into the nitrogen protective cover to maintain a slightly positive pressure state inside to isolate air from entering. When the pressure sensor detects that the nitrogen pressure is too high, the safety valve on the suction assembly 5 will automatically release the pressure and exhaust; when the pressure is too low, nitrogen can be supplemented through the quick interface 9 to maintain the internal slightly positive pressure state.

[0038] The nitrogen protective cover has a simple structure and is easy to process. All connectors are sealed with gasket threads, which is easy to install in the early stage and disassemble and maintain in the later stage. The structure has sufficient explosion-proof strength and low cost. Although the nitrogen protective cover mentioned in patent CN116053506A also has an explosion-proof structure and good sealing, the nitrogen protective cover in the patent is a split structure and uses a liquid seal to seal nitrogen. Therefore, it is necessary to add additional components such as water pumps and water tanks, as well as additional power consumption, which increases the processing cost of the nitrogen protective cover and the operating cost of the entire device and makes the assembly more complicated. The nitrogen protective cover in the present invention has a simpler structure and is easy to assemble, without adding additional costs, and is convenient for subsequent disassembly and maintenance.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A nitrogen protective cover for a liquid hydrogen cooling motor system, characterized in that: include: A bottom plate and a cover body, the motor is arranged on the bottom plate, the cover body and the bottom plate are detachably sealed and connected, a sealed chamber is formed between the bottom plate and the cover body, the motor is located in the sealed chamber, and a sealing gasket is arranged between the corresponding joints between the cover body and the bottom plate. When the cover body is installed, the cover body and the bottom plate can apply opposite pressure to the sealing gasket, so that the cover body and the bottom plate press the sealing gasket, thereby sealing the joint between the cover body and the bottom plate.

2. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 1, characterized in that: The utility model also comprises a base, which is detachably arranged on the bottom plate, and a cover body which is detachably arranged on the base, and sealing pads are arranged between the base and the bottom plate, and between the base and the cover body.

3. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 2, characterized in that: The bottom plate and the base, as well as the base and the cover body are detachably connected via bolts.

4. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 1, characterized in that: The cover body includes a box frame and an observation window fixed on the box frame. The observation window is made of transparent material. A sealing gasket is arranged between the observation window and the box frame. Under the action of the sealing gasket, the observation window and the box frame are sealed and connected.

5. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 4, characterized in that: The cover body also includes a first side plate fixedly arranged on one side of the box frame. A liquid hydrogen inlet pipe is arranged on the first side plate, and the liquid hydrogen enters the sealed chamber through the liquid hydrogen inlet pipe.

6. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 5, characterized in that: It also includes a second side plate, which is fixedly arranged on the other side of the box frame and is provided with a water cooling joint leading to the sealed chamber.

7. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 6, characterized in that: The second side plate is provided with a suction port assembly, which can monitor the nitrogen pressure in the sealed chamber and automatically relieve pressure and exhaust when the nitrogen pressure exceeds a preset value.

8. The nitrogen protective cover for the liquid hydrogen cooling motor system according to claim 6, characterized in that: The suction port assembly comprises a suction port pipeline communicated with the sealed chamber, a pressure sensor and a pressure relief valve arranged on the suction port pipeline.

9. The nitrogen protective cover for a liquid hydrogen cooled motor system according to claim 1, characterized in that: The first side plate is also provided with a quick interface, which is communicated with the sealed chamber and connected to the nitrogen gas source.

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