71results about How to "Reduce internal and external pressure difference" patented technology

The invention discloses an open-close deep-sea plug-and-pull photoelectric composite connector, which comprises a plug and a socket used for plug-and-match. The main body of the socket part is a socket opening and closing core, which is fixed on a rotating bracket through a hinge connection mode. When the plug and the socket are inserted, the socket opening and closing core can be opened under thepush of an umbrella-shaped curved surface of a plunger, the position of the largest opening angle is parallel to the central axis, and is connected with the photoelectric core inside the plug. The plug and the socket of the invention are respectively provided with a variable-volume bellows and a rubber bag as a pressure balancing device; The O-shaped sealing ring arranged in pairs is used for realizing the sealing in the inoperative state; The invention integrates optical signal and electric power transmission, fully considers internal and external pressure balance, has simple structure and simple insertion process, and can ensure reliable connection of deep water environment.

The invention discloses a rotary pluggable photoelectric combined connector used in deep sea. The connector includes a plug and a socket which are matched with each other, and the plug includes a plugshell body, a plug elastic capsule body, a plug web, a plug tail plate and a plurality of plug photoelectric insertion cores; the socket comprises a socket shell body, a socket elastic capsule body,a socket web, a socket tail plate, a plurality of socket photoelectric insertion cores and a movable cavity; the connector is also provided with rotary mechanisms capable of covering / uncovering channels cooperating with the socket photoelectric insertion cores and the plug photoelectric insertion cores, and a locking mechanism is arranged between the front end of the plug and the front end of thesocket. The rotary pluggable photoelectric combined connector can adapt to working environments different in depth, and is reliable in sealing, simple to operate and small in required strength for plugging and pulling.

The invention relates to a bearing spiral combined sealing structure of a high-speed roller bit. The bearing spiral combined sealing structure comprises a roller cone, a bearing, a spiral seal ring and an O-shaped rubber ring. The spiral seal ring is installed in a spiral groove of a roller cone inner hole. When the bit rotates at a high speed, through the pumping effect of the spiral groove, a function of automatically draining sand is achieved. The pressure of the outer side of the O-shaped rubber ring is added, the pressure difference of the two sides of the O-shaped rubber ring is reduced, and the sealing effect of the O-shaped rubber ring is improved. The O-shaped rubber ring is located above the spiral seal ring and installed in a bearing groove with a certain interference. When the bit rotates at a high speed, the auxiliary two-stage sealing is achieved, and the bit can also achieve the effective sealing effect when stopping rotating. The bearing spiral combined sealing structure has good sand draining performance, the abrasion to the bearing can be effectively reduced, the sealing requirements under different working conditions can be met, the sealing reliability and stability are greatly improved, the sealing service life is prolonged. Other supporting elements are not needed for the sealing, and precious time is saved for the roller bit.

The invention discloses a heat-resisting ceramic-armored high-temperature thermocouple and a manufacturing method thereof. The thermocouple is composed of a junction box, a cover shell, wiring columns, a protection bushing, a sealing tape, an insulation layer, a lead, a thermocouple wire and insulators, wherein the protection bushing is made of alumina high-temperature ceramic, a carbon fiber basket is integrated inside the ceramic body, and one surface, facing the inner part of the protection bushing, of the carbon fiber basket exceeds the insulation layer on the inner surface of the protection bushing; a heat conduction block made of pure titanium is also arranged, the working end is connected with the carbon fiber basket extending end, and the center of the opening end is connected with the lead; silicon carbide-based ceramic fiber is braided to form the lead; the sealing tape is made by adopting a high-temperature adhesive HN-767A; the sealing space formed by the protection bushing, the high-temperature adhesive and the junction box is a protective atmosphere environment; and the thermocouple wire is the nickel-chromium-silicon / nickel-silicon thermocouple wire. The thermocouple of the invention can replace an expensive platinum rhodium thermocouple, and has the advantages of good economics, high reliability and long service life.

The invention relates to a vacuum glass air-exhaust port. The air-exhaust port is characterized in that the upper glass of the vacuum glass is perforated, such that the air-exhaust port is formed. A sealing ring is prepared on the lower surface of the upper glass at the periphery of the air-exhaust port. A sealing box is placed at a place on the upper surface of the lower glass and corresponding to the air-exhaust port. The sealing ring can be inserted into the sealing box. After edge-sealing of the upper and lower glass, a metal solder is placed into the air-exhaust port. The air-exhaust port is vacuumed and heated such that the metal solder is molten into liquid, and the liquid is retained in the sealing box. The sealing ring is also immersed in the liquid. The air-exhaust port is automatically sealed according to a liquid sealing principle. After cooling, the liquid is solidified, such that air-tight sealing upon the air-exhaust port is realized. The method provided by the invention can be used in mass productions. With the method, vacuum glass production efficiency and qualification rate can be greatly improved, and production cost can be reduced.

The invention discloses an ultrahigh pressure cylinder, which comprises an internal cylinder and an external cylinder. The rear part of the internal cylinder is sealed with the external cylinder. A steam inlet pipe and a steam exhaust pipe are connected on the external cylinder. The steam inlet pipe passes through the external cylinder and extends into the internal cylinder. Steam enters the internal cylinder through the steam inlet pipe. The front end of the internal cylinder is of a sealed structure. A communication pipe is hermetically connected on the internal cylinder. The other end of the communication pipe is hermetically connected on a steam exhaust opening of the external cylinder. Steam in the internal cylinder is directly discharged to the steam exhaust pipe through the communication pipe. A sealed interlayer space is formed between the internal and external cylinders. A high pressure heater that conveys relatively stable steam to the interlayer space is connected on the external cylinder. When the ultrahigh pressure cylinder operates normally, the steam pressure in the internal cylinder, the steam pressure in the interlayer space and the atmospheric pressure outside the external cylinder decrease progressively. The ultrahigh pressure cylinder reduces the internal and external pressure difference of the external cylinder and maintains the reasonable wall thickness of the external cylinder when through-flow is not changed and steam exhaust pressure is increased so as to alleviate the difficulty in design and manufacturing. The ultrahigh pressure cylinder has strong practicality and high safety.

The invention provides a dust recovery device and a recovery method of hygiene products. The dust recovery device of hygiene products comprises a dust recovery device, wherein the dust recovery device comprises a left box body, a middle box body and a right box body which are arrayed in an assembly way; air outlets of air suction fans are communicated with the left box body; a dust collection device is arranged in the middle box body, the dust collection end of the dust collection device stretches into the right box body and extends to the position between two adjacent filtering devices, a dust collection fan is arranged outside the middle box body, and one end of the dust collection fan is connected with the dust collection device, and the other end of the dust collection fan is communicated with a dust box; and multiple layers of filtering devices are horizontally arranged in the right box body in a sleeving way, air outlets are arranged on right sides of the filtering devices, and the air outlets are used for being communicated with the inner parts of the filtering devices and the outside. According to the invention, as the multiple layers of filtering devices are adopted, the filtering area is large; the internal and external pressure difference of the dust recovery device is small, so that villi in the dust are not damaged easily; and the recovered dust is collected rather than being used directly, so that the impurities in the dust is prevented from influencing the subsequent product quality.

The embodiment of the invention discloses a radiator, electronic apparatus and installation method thereof, belonging to the technical field of electronics assembly and aiming to solve the technical problem of installation methods of radiators of prior arts that not all technique data can not be considered. The radiator comprises a base and fins, the base being provided with a sucker for sucking the radiator on a printed circuit board by air pressure. The electronic apparatus comprises the printed circuit board and the radiator fastened on the printed circuit board. The installation method of the radiator comprises pressing the sucker on the radiator on the printed circuit board. The invention is used for improving the installation of the radiator.

A vacuumizing hole of a vacuum glass is characterized in that the a manufacturing method includes following steps: punching an upper glass of the vacuum glass to form the vacuumizing hole; manufacturing a sealing ring around the vacuumizing hole on the lower surface of the upper glass and manufacturing the sealing ring at the position corresponding to the vacuumizing hole on the upper surface of the lower glass, wherein the sealing ring on the upper glass can be inserted into the sealing ring on the lower glass to form a vacuumizing channel between the two sealing rings; vacuumizing the vacuumizing hole and performing a heating process to enable a metal solder to melt into a liquid which is remained in the sealing ring on the lower glass, wherein the sealing ring on the upper glass is also sunk in the liquid; enabling the vacuumizing hole to seal automatically through a liquid sealing principle; decreasing the temperature to solidifying the liquid to achieve air-tightness sealing of the vacuumizing hole. The method can achieve mass production, can greatly improve production efficient and qualification ratio of a vacuum glass and can reduce production cost.

The invention disclose an air inflation awl for a pulverized coal gasification device. The air inflation awl comprises a taper-shaped barrel and a reinforcement part, wherein the taper-shaped barrel is provided with at least one air inflation area made of sintering metal; the reinforcement part is arranged on the wall of the taper-shaped barrel and at least covers the air inflation area; and a plurality of through holes are formed in the reinforcement part. According to the air inflation awl for the pulverized coal gasification device, which is disclosed by the embodiment of the invention, the strength of the air inflation awl is improved by arranging the reinforcement part covered on the air inflation area, so that the air inflation awl can bear a higher internal and external pressure difference, the highest internal and external pressure difference of 1Mpa, which can be borne by the traditional air inflation awl, is improved to 5Mpa so as to greatly lower the damage possibility of the air inflation awl and prolong the service life of the air inflation awl to lower the cost, meanwhile, the parking times of the air inflation awl are reduced, and the production efficiency is improved. In addition, according to the air inflation awl disclosed by the embodiment of the invention, the phenomenon that the pulverized coal flows back can be effectively prevented, and the pulverized coal conveying effect is guaranteed.

The invention relates to the technical field of refrigeration, in particular to an air pressure balance structure for a refrigeration device and the refrigeration device. The inner end of an airflow pipe of the air pressure balance structure is communicated with a refrigeration cavity of the refrigeration device, the outer end of the airflow pipe is communicated with the environment, a fan is arranged in the airflow pipe, and the rotation surface of the fan is disposed in the airflow direction in the airflow pipe. The air pressure balance structure is arranged in a box door of the refrigeration device. When a refrigerator performs refrigeration, due to temperature changes, external airflow enters a box body through the airflow pipe, and the fan is driven to rotate. In the process, when internal and external pressure difference of the refrigeration device (such as the refrigerator) is large, the rotating speed of a fan rotor is accelerated, the internal and external pressure difference of the refrigerator can be quickly reduced; during a normal state, the internal and external pressure difference of the refrigerator is small, a rotating force of the fan rotor is weak, the fan rotor almost does not rotate, the fan rotor and the outer end of the airflow pipe form a relatively sealed environment, and cool air leakage is avoided. The air pressure balance structure is simple in overall structure, the internal and external pressure difference of the refrigerator can be quickly reduced, and conditions that it is difficult to open a refrigerator door of the refrigerator are avoided.

The invention discloses a method and device for quickly separating oil and water under high temperature and high pressure. The device comprises an upper shell and a lower shell; a hydrocyclone is arranged in the upper shell and used for primary separation; the lower shell is provided with a coalescer for secondary separation; and an overflow liquid outlet and an underflow liquid outlet are arranged on the upper shell and can be respectively connected with an overflow liquid backflow port and an underflow liquid backflow port arranged on the top of the lower shell through pipelines. According to the method and the device, the high-temperature and high-pressure resistance of the hydrocyclone can be improved by changing the connection positions of outer interfaces of the upper shell and the lower shell according to the change of the composition of a separated medium, so that the rapid separation of oil and water in one device can be realized, and the separation efficiency can be improved.

The invention provides an organic-inorganic composite agriculture and forestry water-retaining agent and a preparation method thereof, and relates to the field of water-retaining agents. The water-retaining agent is prepared from, by mass, 30-40 parts of straw cellulose, 10-20 parts of modified vermiculite, 5-8 parts of humic acid, 80-100 parts of a potassium hydroxide solution with the mass concentration of 5-10%, 3-6 parts of N,N'-methylenebisacrylamide, 1-2 parts of potassium persulfate, 50-60 parts of a sodium hydroxide solution with the mass concentration of 3-6%, 100-120 parts of a ureasolution with the mass concentration of 1-3%, 60-80 parts of an acrylic acid solution with the neutralization degree of 80%, 5-10 parts of gamma-polyglutamic acid, 20-30 parts of a carbodiimide solution with the mass concentration of 2-5%, 10-12 parts of 1,4-butanediamine, 0.1-1 part of a buffering agent and 60-80 parts of deionized water. The composite agriculture and forestry water-retaining agent has quite high water absorption rate, and can effectively relieve soil hardening besides water retention and fertilizer extraction when used in soil.

The invention relates to a vacuum glass air-exhaust port structure. The structure is characterized in that: a round hole is provided on the upper glass of the vacuum glass, such that the air-exhaust port is formed; a round pipe is prepared and inserted into the round hole, and the upper end of the round pipe is welded with the upper glass; a sealing ring is prepared on the upper surface of the lower glass, and a recess or a recessed groove is prepared in the sealing ring, wherein the lower end of the round pipe can be inserted into the recess or recessed groove; after edge-sealing of the upper and lower glass, a metal solder is placed into the air-exhaust port or round pipe; the air-exhaust port is vacuumed and heated such that the metal solder is molten into liquid, and the liquid is retained in the recess or recessed groove and in the sealing ring; the lower end of the round pipe is also immersed in the liquid; and the air-exhaust port is automatically sealed according to a liquid sealing principle. The method provided by the invention can be used in mass productions. With the method, vacuum glass production efficiency and qualification rate can be greatly improved, and production cost can be reduced.

The invention discloses an airship with an inflating skeleton expanding in air, which comprises an airship body 1, a tail wing 2, a tail thruster 3, a connecting element 7, a payload bay 8, a solar cell panel 9, a nose cone 10, a first auxiliary rope 11, an automatic inflating device 12, a second auxiliary rope 13 and two high-altitude balloons 14. The airship is characterized in that a dimensional element of the airship body 1 is skin 4, a longitudinal element is a rigid skeleton 5, and an annular element is an inflating skeleton 6; the inflating skeleton 6 is connected with the rigid skeleton 5 by the connecting element; and the skin 4 is fixedly connected on the outer surface of a grid formed by the rigid skeleton 5 and the inflating skeleton 6. The invention overcomes the defect that a soft bag in a folding state and a connecting part of a pod and other rigid structures are easily torn by strong wind and vortex in the lifting process.

The invention relates to the field of fans, and particularly relates to a blowing or induced draft device for pressurizing combustible and explosive as well as corrosive gases. When a working gas is a hazardous gas which is high-pressure, combustible, explosive, corrosive and the like, as a protective gas is arranged in a pressure vessel, an inside-outside pressure difference of a fan can be decreased; and therefore, higher rising pressure can be safely provided. By using the blowing or induced draft device for pressurizing the inflammable and explosive as well as corrosive gases, the pressure vessel is only needed to be filled with the protective gas, and a magnetic driver is not needed to be arranged additionally; therefore, the manufacturing cost is low; the structure is simple; and the production is easy. According to the blowing or induced draft device for pressurizing the inflammable and explosive as well as corrosive gases, a pressure gauge is adopted to monitor gas pressure in the pressure vessel and a gas inlet; the absolute value of a pressure difference between the protective gas and the working gas is guaranteed to meet the pressure resistance of a shell of the fan; therefore, the safe running of the fan is guaranteed; and moreover, the manual monitoring is not needed.

The invention discloses a two-stage compressor with a built-in economizer. The two-stage compressor comprises a shell. A transverse and straight drive crankshaft is arranged in the shell. A pump assembly I is mounted at one end of the drive crankshaft, a pump assembly II is mounted at the other end of the drive crankshaft, and a high pressure and low pressure isolating plate is mounted on the outer side of the pump assembly II. The two ends of the shell are sealed through an end cover I and an end cover II to form a closed cavity. The high pressure and low pressure isolating plate partitions the cavity into a cavity body I and a cavity body II. The cavity body I and the cavity body II communicate with an air suction pipe and an air exhaust pipe correspondingly. The position, located in thecavity body I, on the drive crankshaft at the inner side of the pump assembly II is sleeved with the economizer. According to the two-stage compressor provided by the invention, the economizer is located in the compressor, the system space is not occupied, and the problem that an economizer in the prior art occupies a space independently is solved; and the economizer is located in the compressor,the inside and outside pressure difference of the economizer is small, pipes with smaller thicknesses can be selected, and the heat exchanging efficiency is improved on the basis that the cost is lowered.

The invention provides a low-pressure-difference sealing gravity compressed air energy storage system and method.The energy storage system comprises a vertical shaft and a sealing film, a gravity plunger is movably inserted into the vertical shaft, and a gap is formed between the vertical shaft and the gravity plunger; the sealing film is located in the gap, and the sealing film is connected with the vertical shaft and the gravity plunger in a sealed mode, so that an air storage cavity is defined by the gravity plunger, the sealing film and the space, located below the sealing film, of the vertical shaft and used for storing compressed air. A regulating cavity is defined by the sealing film, the gravity plunger and the space, located above the sealing film, of the vertical shaft, pressure liquid is introduced into the regulating cavity, and the pressure liquid exerts downward pressure on the sealing film through injection of the pressure liquid into the regulating cavity above the sealing film. The pressure effect of the pressure liquid on the sealing film can reduce the internal and external pressure difference of the sealing film, thereby reducing the stress of the sealing film, prolonging the service life of the sealing film and reducing the cost of the sealing film.

The invention discloses a numerical control pulse blow-cleaning dust removing system and an urban road vacuum sweeper. The numerical control pulse blow-cleaning dust removing system comprises a bag-type dust remover, an air separation cylinder, a flying dust cover, an exhaust pipe, and a ventilation pipe; a circulatory system is formed by the bag-type dust remover, the air separation cylinder, and the flying dust cover through the exhaust pipe and the ventilation pipe; the air separation cylinder comprises a cylinder body and several pulse nozzles communicated with the cylinder body; the pulse nozzles are respectively communicated with an air inlet of the flying dust cover; and each pulse nozzle is provided with a pulse valve; a high pressure fan is further arranged on the exhaust pipe; a ventilation fan is further arranged on the ventilation pipe. The numerical control pulse blow-cleaning dust removing system and the urban road vacuum sweeper have the technical advantages of being significant in dust removal effect, energy-saving, stable and reliable in use performance, and the like.

The invention relates to an electrolytic cell suitable for pressurizing a circulating pump shell. The electrolytic cell comprises at least one working cavity, a gas-liquid separator and a circulatingpump; the gas-liquid separator is communicated with a hydrogen outlet or an oxygen outlet of the electrolytic cell; the circulating pump is arranged in the working cavity. A working method of the electrolytic cell comprises the following steps: S1, arranging the circulating pump and the gas-liquid separator in the same working cavity; S2, enabling the gas-liquid separator to separate gas output from the electrolytic cell, and enabling the separated gas to be communicated with the interior of the working cavity, so as to form the positive pressure in the working cavity; and S2, conveying an electrolyte to the electrolytic cell by the circulating pump in the positive pressure environment. The circulating pump operates in the positive-pressure working cavity, so that the internal and externalpressure difference of the circulating pump is reduced, the leakage probability of the circulating pump is reduced, the circulating pump operates in the positive-pressure environment, and the circulating pump with a low-pressure-bearing pump shell can be selected.

The invention relates to multifunctional, anti-fogging and anti-dazzling composite structure glass which comprises a hydrophobic glass layer, a polarization glass layer and a sealing strip, wherein an inert gas layer is arranged between the hydrophobic glass layer and the polarization glass layer; the one side, facing toward the inert gas layer, of the hydrophobic glass layer is provided with a low-radiation film; the hydrophobic glass layer, the low-radiation film, the inert gas layer and the polarization glass layer are sequentially connected to form a composite body; the sealing strip is arranged at the periphery of the composite body so as to seal the composite body. Compared with the prior art, the multifunctional, anti-fogging and anti-dazzling composite structure glass has the advantages of rainwater prevention property, anti-dazzling property, heat resistance, water fog formation prevention property and the like.

The invention discloses a protection structure and working method of a bellows of a vacuum interrupter under high gas pressure. Ring, conductive spring, static bellows and connecting flanges welded to the upper and lower ends of the static bellows; the present invention transforms the structure of the bellows of the tank-type fast vacuum circuit breaker from the arc extinguishing chamber to bear the gas pressure through the setting of the sealing structure of the static bellows It is a two-stage air chamber structure, which ensures that the pressure difference of the insulating gas on both sides of the bellows of the interrupter is reduced to an atmospheric pressure difference, which can effectively improve the mechanical life of the bellows of the vacuum interrupter.

The invention relates to an air-exhaust port sealing structure which is characterized in that upper glass of vacuum glass is perforated, such that an air-exhaust port is formed; an upper insertion part and a lower accommodation part are manufactured, wherein the upper insertion part is connected with the upper glass in a sealed manner, the lower accommodation part can retain liquid, and the upper insertion part is inserted into the lower accommodation part; after edge-sealing of the upper and lower glass, a metal solder is placed into the air-exhaust port or the upper insertion part; the air-exhaust port is vacuumed and heated, such that the metal solder is molten into liquid; the liquid is retained in the lower accommodation part, and the upper insertion part or the lower end thereof is also immersed in the liquid; according to a liquid sealing principle, the air-exhaust port is automatically sealed; when the temperature is reduced, the liquid is solidified, such that air-tight sealing of the air-exhaust port is realized. The method provided by the invention can be used in mass productions. With the method, vacuum glass production efficiency and qualification rate can be greatly improved, and production cost can be reduced.

The invention discloses a blast furnace slag granulation and waste heat recovery system, and relates to the field of blast furnace slag waste heat recovery. The blast furnace slag granulation and waste heat recovery system comprises a blast furnace, a high-pressure slag conveying device, a slag granulation fluidized bed device, a supercritical CO2 recompression power circulation system and a low-temperature slag heat recovery device; the high-pressure slag conveying device is arranged between the blast furnace and the slag granulation fluidized bed device; the slag granulation fluidized bed device is connected with the low-temperature slag heat recovery device; and the supercritical CO2 recompression power circulation system is respectively connected with the slag granulation fluidized bed device and the low-temperature slag heat recovery device. The supercritical CO2 recompression circulation technology is introduced, meanwhile, supercritical CO2 airflow is adopted as a cooling medium, the waste heat recovery efficiency is improved, and meanwhile high-quality slag products are produced.

The invention discloses a high-voltage vacuum switch tube, and relates to the technical field of vacuum switch tubes. The device comprises an insulating shell, a shielding cover, a movable contact rodand a static contact rod, a shielding cover is fixed in the insulating shell; an end socket A is fixed at one end of the insulating shell; an end socket A is fixed on the peripheral side surface of the static contact rod; the other end of the insulating shell is fixedly provided with a voltage-dividing seal head; the outer side surface of the partial pressure seal head is provided with a steppedhole not lower than two stages; a stepped table matched with the stepped hole is arranged on the peripheral side surface of the movable contact rod; the inner surface of the stepped hole is in slidingfit with the stepped table; and a sliding sealing ring for gas sealing between the stepped hole and the stepped table is fixed on the inner wall of each stage of the stepped hole. Under the action ofthe pressure dividing end socket and the step table, the pressure dividing end socket is divided into a plurality of pressure dividing cavities capable of reducing pressure step by step, and the effect of remarkably reducing the borne internal and external pressure difference is achieved.

The invention discloses an air conditioning control method of a refrigerator, an air conditioning drawer and a fresh-keeping refrigerator. Wherein, the method includes: monitoring the oxygen concentration of the drawer and the pressure difference inside and outside the drawer when the drawer is closed; controlling the opening and closing of the vacuum pump in the nitrogen-oxygen separation membrane module and the air pipe The opening and closing of the air intake hole of the road channel. The invention realizes the linkage control of the nitrogen-oxygen separation membrane module and the air inlet switch of the air pipeline channel, which can not only adjust the gas concentration of the drawer to effectively keep the refrigerated food fresh, but also solve the problems of drawer deformation and negative pressure, so that The drawers are easy to move and secure.

The invention discloses a underwater motor bearing a complex load. The underwater motor comprises an output shaft, a shell, angular contact bearings, a coil, magnetic steel, a compaction ring, a control board card, a tail baffle plate, a watertight socket, a balanced film plug, a pressure balance film and insulating oil. A front end of the shell is provided with the angular contact bearings. A middle portion of the output shaft is provided with the magnetic steel and a tail end is coupled to the compaction ring through the angular contact bearings. A peripheral shell of the magnetic steel is provided with the coil. A rear end of the shell and the tail baffle plate are sealed and fixed together in a screw joint mode. A front end of the tail baffle plate is equipped with the control board card, and a rear end is equipped with the watertight socket, the balanced film plug and the pressure balance film. The two angular contact bearings are arranged on the output shaft in a wide surface towide surface mode. The insulating oil is injected into the shell. In the invention, through the wide surface to wide surface mode, the angular contact bearings are arranged; the insulating oil is filled into a motor shell chamber and the pressure balance film is arranged so that internal and external differential pressure is reduced and simultaneously a capability of the underwater motor to bear the complex load is increased; and heat dissipation is effectively performed and self-weight is reduced.