45results about How to "Avoid high temperature operation" patented technology

The invention discloses a method for co-producing sodium stannate and stannic oxide by solder removing liquid, comprising the following steps: separating tin in the solder removing liquid, recovering copper, transforming copper into sodium stannate, preparing sodium stannate and preparing stannic oxide. The method of the invention features in low processing cost, simple technical process and device structure, and high product purity and can prepare sodium stannate and stannic oxide.

The invention discloses a method for manufacturing a gas sensor for detecting NH3 at room temperature. The method comprises the following steps of: manufacturing a metal electrode on the surface of a flexible substrate; manufacturing a sensitive membrane Alpha-Fe2O3-ZnO; and combining the sensitive membrane Alpha-Fe2O3-ZnO and the surface, which is provided with the metal electrode, of the flexible substrate to form the gas sensor for detecting the NH3 at the room temperature. According to the method, the sensitive membrane material is combined with the flexible substrate by an indirect method, so that high-temperature operation on the flexible substrate in a sensitive membrane preparation process is avoided; the sensitive membrane Alpha-Fe2O3-ZnO is coated on the SiO2 substrate; then the lower SiO2 is etched off by HF acid, and the sensitive membrane is separated from the substrate; and finally a layer of conductive silver paste is coated on the electrode surface of the flexible substrate, so that the sensitive membrane can be combined with the flexible substrate.

The invention discloses a method for preparing isobutylene by using an adsorption separation method. The method is characterized in that calcium modified 5A molecular sieves are adopted as adsorbents with high selectivity; a multistage bed adsorption method is adopted; in order to ensure that the adsorbents can continuously process C4 materials, at least three fixed bed adsorbers are simultaneously required, namely an adsorber for adsorption, an adsorber for desorption and a reactor for generation (burning); at the same time, polymerization inhibitors are added and high temperature operation is prevented; n-hexane, heptane and the like are adopted as desorption agents; adsorption and desorption processes are carried out at the temperature of 100 DEG C and pressure of 101.325kPa; the vaporized C4 materials are pumped into a first adsorption tower which is washed with n-hexane in advance, and at the moment, the desorption effect of n-hexane is generated on the one hand and the adsorption effect on n-butylene is generated on the other hand; n-hexane after desorption and isobutylene are discharged from the tower top; and after isobutylene is separated, n-hexane returns to a system for recycling. The preparation method disclosed by the invention is one of the best methods for preparing isobutylene.

The invention discloses a manufacturing method of a NO2 gas sensor used for room temperature detection. The manufacturing method of the NO2 gas sensor used for room temperature detection comprises the following steps of: preparing a metal electrode on the surface of a flexible substrate, making a SWCNTs / SnO2 sensitive film, and bonding the SWCNTs / SnO2 sensitive film with the surface of the flexible substrate, provided with the metal electrode, so as to form the NO2 gas sensor used for room temperature detection. By adopting the manufacturing method of the NO2 gas sensor used for room temperature detection, the problems that adhesion between a sensitive material and the flexible substrate is poor and distribution is not uniform are solved, and the aim of causing the sensitive material and the flexible substrate to be firmly bonded and uniformly distributed is achieved.

The invention discloses antioxidant whitening type natural soothing oil and a preparation method thereof. The antioxidant whitening type natural soothing oil is prepared from the following raw materials and components: camellia-seed oil, green tea seed oil, natural squalane, grape seed oil, VC or VC derivates, VE or VE derivates, bisabolol, a glycyrrhiza glabra extract, a poria cocos extract and astaxanthin which are uniformly mixed to prepare the antioxidant whitening type natural soothing oil. According to the antioxidant whitening type natural soothing oil, the natural plant oil and natural antioxidant whitening materials are selected and adopted to meet the demands of people on multifunctional skin care products capable of naturally caring the skin and resisting pollution; the preparation method is simple and low in requirements on devices; high-temperature operation is avoided, so that the active ingredients can be maintained; the preparation method is suitable for mass production.

The invention discloses a method for preparing isobutylene by adsorption separation. The method is characterized in that molecular sieve adsorbents with high selectivity are adopted; an adsorption method is adopted for separating isobutylene; the adsorbents are calcium modified 5A molecular sieves; a multistage bed adsorption method is adopted; in order to ensure that the adsorbents can continuously process C4 materials, at least three fixed bed adsorbers are simultaneously required, namely an adsorber for adsorption, an adsorber for desorption and a reactor for generation (burning); as the surfaces of the adsorbents have acidity, the adsorption and desorption processes are carried out at the temperature of 100 DEG C and pressure of 101.325kPa; the adsorption solution is rectified to remove a small amount of n-butane and 2-butylene; and the purify of the finally obtained 1-butylene is greater than 99.0%. The method has reasonable processes, is simple in preparation, and is the simplest and most convenient and ideal technology for preparing isobutylene.

A method for low temperature desulphurization of a sodium aluminate solution is characterized in that low temperature oxidation desulphurization of the sodium aluminate solution which is a slurry obtained after high temperature dissolve-out of high sulfur bauxite through introducing oxygen in order to remove S<2-> in the sodium aluminate solution. A low temperature oxidation technology is adopted to oxidize the dissolve-out slurry of the high sulfur bauxite, so S<2-> in the sodium aluminate solution can be removed, and the desulfurization rate reaches above 90%. The method has the advantages of low operation temperature, good desulphurization effect, low energy consumption and the like.

The invention relates to compound nutritious food with antineoplastic and immunity enhancement functions and a production method for the compound nutritious food with the antineoplastic and immunity enhancement functions, belonging to the field of nutritious food processing. The compound nutritious food is prepared by means of taking soft-shelled turtle, lucid ganoderma, agaricus blazei murill, white fungus, lentinula edodes, hericium erinaceus, maize germ, lemon and red dates as raw materials, and being subjected to ultralow-temperature freezing, crushing, temperature / phase-conversion composite extraction, separation, purification and sterilization. The compound nutritious food has an excellent palatability and special nutrition effects, contains functional components, such as vitamins, mineral substances, edible fungi active polysaccharides and polyunsaturated fatty acids, and has the effects for improving immunity and resisting tumor. The compound nutritious food is especially suitable for recovery of postoperative cancer patients and chemoradiotherapy patients. According to the compound nutritious food with the antineoplastic and immunity enhancement functions and the production method for the compound nutritious food with the antineoplastic and immunity enhancement functions, a soft-shelled turtle full-utilization technology is adopted, edible mushrooms and the maize germ are taken as raw materials, no waste materials are produced in the production process, the utilization rate of the raw materials is high, the compound nutritious food contains no additives, such as essences, pigments, preservatives and stabilizers, toxic and side effects are prevented, and the edible safety is guaranteed.

The invention relates to a method for preparing colored sand and a production system and mainly solves the technical problems of poorer product weatherability, high raw material cost, high high-temperature processing energy consumption, high probability of new environmental pollution and the like of the conventional artificial colored sand. According to the technical scheme, the method for preparing the colored sand comprises steps as follows: firstly, aggregate is added to a container moving circumferentially, then a liquid accounting for 1.3%-1.6% of the weight of the aggregate is added, rolling is performed for 1-2 min, and the aggregate surface is enabled to be wet; colored gelation powder accounting for 6%-8% of the weight of the aggregate is added, rolling wrapping is performed for 3-5 min, the aggregate surface wetted by the liquid is wrapped with the colored gelation powder, and a dense first colored wrapping layer is formed; the steps are repeated; finally, an artificial colored sand raw material is prepared, the thickness of the colored wrapping layer of the artificial colored sand raw material is 10%-55% of average diameter of aggregate particles, the artificial coloredsand raw material is finally put in a curing box with the temperature being 20-60 DEG C and humidity being 60%-90% for 10-15 d, and artificial colored sand is obtained.

The invention discloses an angle-adjustable photovoltaic cell panel support rack. The angle-adjustable photovoltaic cell panel support rack comprises a rotation handle, a sleeve, a fixed disc, a shaftrod, a limitation sheet, a connection plate, a friction block, a friction ring, a waterproof plate, a drainage groove, a cell fixing plate, a folding pipe, a fixed ring, a bearing, a locking bolt, asupport table, a bottom plate, a cooling groove, a power distribution shell, a limitation groove, a clamping sheet, a clamping bolt and a pipeline type air exchange fan. The cell fixing plate is fixedon the shaft rod, the rotation power is provided for the shaft rod by the rotation handle and the sleeve, thus, angle adjustment is enabled to be performed on a solar cell panel fixed on the cell fixing plate, the solar cell panel can be arranged at the optimal illumination position at different times in a day all the way, and the highest photovoltaic conversion efficiency of the cell panel is maintained all the way.

The invention discloses a method for co-producing sodium stannate and stannic oxide by solder removing liquid, comprising the following steps: separating tin in the solder removing liquid, recovering copper, transforming copper into sodium stannate, preparing sodium stannate and preparing stannic oxide. The method of the invention features in low processing cost, simple technical process and device structure, and high product purity and can prepare sodium stannate and stannic oxide.

The invention discloses a signal assisting type intelligent adjusting system for a bedroom air conditioner. The signal assisting type intelligent adjusting system comprises a power supply, an air conditioner body, a sleep control circuit, a signal receiver and an intelligent bracelet, wherein the air conditioner body, the sleep control circuit and the signal receiver are respectively connected with the power supply, and the intelligent bracelet is connected with the signal receiver through a wireless network; the signal input end of the sleep control circuit is connected with the signal receiver, the power input end of the sleep control circuit is connected with the power supply, and the output end of the sleep control circuit is connected with the air conditioner body; the signal receiving end of the signal receiver is provided with a signal assisting receiving circuit. The signal assisting type intelligent adjusting system for the bedroom air conditioner has the advantages that the system can automatically adjust indoor temperature according to the sleep depth of people to allow people to have a comfortable sleep environment, people's life quality is increased greatly, the on and off of the air conditioner can be adjusted according to environment temperature, and product use effect is further increased.

The invention discloses a processing technology of instant aronia melanocarpa food. The instant aronia melanocarpa food takes aronia melanocarpa as a raw material and is compatible with cassia seed, mulberry leaf, mulberry, chrysanthemum and grosvenor momordica fruit. The processing technology comprises the following steps: 1, mixing cassia seed, mulberry leaf, mulberry, chrysanthemum and grosvenor momordica fruit, and extracting the mixture to obtain a modified liquid, 2, steaming the fresh aronia melanocarpa, 3, mixing the steamed aronia melanocarpa and the modified liquid by adopting a blending device, and 4, carrying out freeze-drying, sterilizing and packaging. According to the processing technology, a mixed extracting solution of the cassia seeds, the mulberry leaves, the mulberries,the chrysanthemums and the momordica grosvenori is used as a modifying solution, so that the original bitter taste of the aronia melanocarpa can be neutralized, and the nutrition comprehensiveness ofthe aronia melanocarpa food can also be improved; besides, in the subsequent finished product processing process, high-temperature operation is avoided, a freeze-drying process is adopted, the loss of nutrient substances in the food can be reduced, and the highest nutrient value of the finished product is guaranteed.

The invention belongs to the technical field of pharmaceutical preparations, and particularly relates to an ibuprofen sustained-release capsule and a preparation method thereof. The capsule is prepared by the following steps: enabling ibuprofen and a sustained-release carrier to be prepared into a solid dispersion by a spray drying method, adding a lubricant, performing mixing and performing filling, wherein preferably, the sustained-release carrier is polyacrylic resin polyethylene glycol. The capsule is good in slow release effect, good in process reproducibility and suitable for large-scaleproduction.

The invention relates to a process for preparing toluene diisocyanate (TDI) by using toluenediamine and dimethyl carbonate. According to the process, a deactivation catalyst, namely zinc oxide (ZnO), of a reaction, which is used for synthesizing toluene dicarbamate (TDC) through catalyzing toluenediamine and dimethyl carbonate by zinc acetate, is used as a catalyst of a reaction for TDC decomposed TDI preparation, the deactivation catalyst, namely ZnO, of the reaction is not required to be separated from the product TDC and is directly applied to the reaction for TDC decomposition catalyzed TDI preparation, and a TDC decomposed TDI preparation process adopts that decomposition reactors of two stages are in series connection and a fractional condenser is arranged between the decomposition reactors of two stages. According to the process, TDC is synthesized through catalyzing toluenediamine and dimethyl carbonate by zinc acetate, and the deactivation catalyst, namely ZnO, of TDC synthesis is selected as an efficient catalyst for TDC decomposition reaction, so that the catalysis effect is good, and the yield of TDI is high; and the temperature of the TDC decomposition reaction is low, so that the total production cost can be greatly reduced.

The invention discloses a filter regulation type intelligent regulation system for a sleep air conditioner. The filter regulation type intelligent regulation system for the sleep air conditioner comprises a power supply, an air conditioner main body, a sleep control circuit, a signal receiver and an intelligent bracelet, wherein the air conditioner main body, the sleep control circuit and the signal receiver are connected with the power supply; the intelligent bracelet is connected with the signal receiver through a wireless network; the signal input end of the sleep control circuit is connected with the signal receiver; the power input end of the sleep control circuit is connected with the power supply; the output end of the sleep control circuit is connected with the air conditioner main body; and a filter amplifier circuit is also connected in series between the signal receiver and the sleep control circuit. The invention provides the filter regulation type intelligent regulation system for the sleep air conditioner, which can automatically regulate and control the indoor temperature according to the depth of sleep of people to make the people have more comfortable sleep environment and greatly improve the life quality of the people and can also regulate opening and closing of the air conditioner according to the environmental temperature so as to further improve the using effect of a product.

The invention relates to a low-temperature transfer injection pump, which is small in size, light in mass, high in working efficiency, strong in adaptability, long in service life and good in stability. The low-temperature transfer injection pump comprises a motor, a motor enclosure and a pump body, wherein the motor is arranged in the motor enclosure, and a spray nozzle and a wiring post are arranged on the upper surface of an enclosure upper end cover of the top part of the motor enclosure; a first bearing is arranged at the center position of the bottom part of the enclosure upper end cover, and the bottom part of the motor enclosure is connected with the top part of a pump body rear cover through a sealing structure; the pump body rear cover is connected with a volute; an impeller is arranged in the volute, and a rear cover plate of the impeller is arranged at the bottom part of the pump body rear cover; a liquid outlet is formed in a position, which corresponds to an outlet of the impeller, of the side wall of the volute; a second bearing is arranged in the pump body rear cover and is positioned at the top part of the rear cover plate of the impeller; the top part of a main shaft of the motor is connected with the first bearing, and the bottom part of the main shaft of the motor is connected with the impeller by penetrating through the second bearing; the enclosure upper end cover is connected with the pump body rear cover through a long bolt, and the pump body rear cover is connected with the volute through a short bolt.

The invention provides a method for extracting grease from artemia or artemia eggs. In the method, a finished product of the grease is obtained by a plurality of steps of preprocessing the artemia or the artemia eggs, carrying out supercritical extraction, refining the grease and the like. Compared with a traditional method, the invention has the characteristics of low-temperature operation, little possibility of oxidation of unsaturated fatty acid, good quality, high yield of the extracted grease, no adoption of an organic solvent in the entire process, high-temperature operation avoidance, combined single-step operation of a plurality of procedures, low energy consumption, easy amplified production and the like.

The invention relates to an azoxystrobin acetone solvate and a preparation method thereof. Characteristic peaks exist at positions with the following diffraction angles represented by 2theta angles: 7.32+ / -0.20 degrees, 8.42+ / -0.20 degrees, 13.26+ / -0.20 degrees, 14.16+ / -0.20 degrees, 18.04+ / -0.20 degrees, 18.52+ / -0.20 degrees, 18.90+ / -0.20 degrees, 20.40+ / -0.20 degrees, 21.04+ / -0.20 degrees, 22.36+ / -0.20 degrees, 23.96+ / -0.20 degrees, 24.36+ / -0.20 degrees, 26.46+ / -0.20 degrees, 28.4+ / -0.20 degrees, 30.06+ / -0.20 degrees and the like, wherein the characteristic peak at the position with the diffraction angle 2theta of 7.32+ / -0.20 degrees is an initial peak, and the relative strength is 100%. The preparation method is a constant-temperature suspension rotating crystal method, operation is simple, control is easy, reproducibility is good, the problems of difficult filtering and low efficiency in production are solved, and the preparation method is suitable for industrialization.

The invention discloses a sleep and air conditioner hybrid type intelligent adjusting system. The system comprises a power supply, an air conditioner body, a sleep control circuit, a signal receiver and an intelligent bracelet, wherein the air conditioner body, the sleep control circuit and the signal receiver are connected with the power supply, and the intelligent bracelet is connected with the signal receiver through a wireless network. The signal input end of the sleep control circuit is connected with the signal receiver, the power input end of the sleep control circuit is connected with the power supply, and the output end of the sleep control circuit is connected with the air conditioner body. An auxiliary signal receiving circuit is further arranged at the signal receiving end of the signal receiver. A filter and amplification circuit is connected in series between the signal receiver and the sleep control circuit. A power buffer circuit is further arranged at the output end of the power supply. According to the sleep and air conditioner hybrid type intelligent adjusting system provided by the invention, the indoor temperature can be automatically regulated and controlled according to the sleep depth of people, so that a more comfortable sleep environment is provided for people, and living quality of people is greatly improved; meanwhile, starting and stopping of an air conditioner can be adjusted according to ambient temperatures, and thus the product using effect is further improved.

The invention relates to a sample digestion method for measurement of the iron content in a medicine. Nitric acid with the concentration of 15-40% is used, and iron in the medicine can be totally digested through digesting and boiling reflux. After a digested sample solution is diluted, measurement of the iron content can be further carried out through an atomic absorption spectrometry. The method is high in safety, simple to operate, complete in iron digestion, and capable of taking the place of a method that strong-corrosion mixed acid is used for sample digestion in the prior art.

The invention discloses a test device and a test method for anti-corrosion performance. The test device includes a heating kettle, a cooling rod, a four-way connector, a telescopic bellows, a bottoming vent pipe, a thermocouple bundle, a sample support and a first sample The fixed ring, the heating kettle includes the kettle body and the kettle cover, the cooling rod vertically penetrates the center of the kettle cover and extends into the kettle body, the top of the cooling rod is also equipped with a cooling rod lifter, and the kettle cover is also equipped with an air outlet and a kettle cover lifter , the upper part of the cooling rod is installed in the upper and lower channels of the four-way connector, and the four-way connector is connected to the kettle cover through a telescopic bellows; The beam extends into the kettle body from the right channel; the sample holder and the first sample fixing ring are sequentially passed through the lower section of the cooling rod from the bottom of the cooling rod, and the sample holder includes the second sample fixing ring, which is set on the cooling rod and extends out Two centrally symmetrical horizontal arms are connected to a vertical arm at the end, and a circular sample stage is arranged at the end of the vertical arm.

The invention belongs to the technical field of pharmaceutical preparations, and in particular relates to an ibuprofen sustained-release capsule and a preparation method thereof. The capsule is formed by preparing the ibuprofen and the sustained-release carrier into a solid dispersion by a spray-drying method, adding a lubricant, mixing, and filling. A preferred slow-release carrier is polyacrylic resin-polyethylene glycol. The capsule has good sustained release effect, good process reproducibility and is suitable for large-scale production.

The invention provides a preparation method of an andrographis paniculata freeze-dried preparation, which comprises the following steps: carrying out reflux extraction on the andrographis paniculata medicinal material respectively with 20-times, 18-times and 18-times 60% ethanol for three times, 90 minutes per time; mixing the extracting solutions; recovering ethanol to prepare fluid extract; adding ethanol to enable the ethanol content to reach 80%; standing over night; filtering; adding 1% of active carbon into the filtrate; stirring for 30 minutes; filtering with a sterilized G4 filter element under aseptic conditions; recovering ethanol from the filtrate, and carrying out vacuum concentration until the crude drug content is about 3g / ml; adding a right amount of solubilizing agent and uniformly mixing; adding water for injection for metering volume until the crude drug content is 2g / ml; sub-packaging; freeze-drying; covering; labeling; and packaging to obtain the andrographis paniculata freeze-dried preparation. The freeze-dried preparation can be preserved in a vacuum state, so that the stability of effective components can be obviously increased and the shelf life of the product can be prolonged.

The invention belongs to the field of medicine synthesis, and particularly relates to a method for preparing a prucalopride intermediate. The method comprises the following steps: performing acylation and demethylation reactions on 2-methoxy-4-acetylamino-5-chloro methyl benzoate (I) serving as an initial raw material at 0-20 DEG C under the action of a proper amount of an acylating agent and lewis acid to obtain an intermediate (II); adding an alkaline reagent into the intermediate (II), and performing cyclization reaction at 0-20 DEG C in a polar solvent to obtain an intermediate (III); adding hydrazine hydrate and absolute ethyl alcohol to the intermediate (III), and performing reduction reaction at 70-80 DEG C to obtain an intermediate (IV); performing hydrolysis reaction on the intermediate (IV) at 90-100 DEG C under the action of a sodium hydroxide solution to obtain sodium salt of an intermediate (V), and acidizing with hydrochloric acid to obtain the intermediate (IV). The synthesizing route has mild reaction condition, low production cost and high yield, and is suitable for industrial production.

The invention discloses a ladle automatic casting system and method, wherein, a steel-connecting robot can drive a 3D scanner to scan and obtain the coordinates of a positioning plate and a nozzle mechanism at a steel-connecting location and obtain the relative positional relationship between the two, which can drive a 3D The scanner scans to obtain the coordinates of the nozzle cylinder at the steel connection position, and then grabs the nozzle cylinder and installs it on the nozzle mechanism. The robot at the casting position can drive the 3D scanner to scan and obtain the initial position of the locked collaborative manipulator, and then place the long nozzle on the collaborative robot arm. On the mechanical arm, it can drive the 3D scanner to scan and obtain the coordinates of the positioning plate at the casting position, and obtain the coordinates of the nozzle mechanism at the casting position through the relative position relationship, and can pull the unlocked cooperative robot arm to make the long nozzle at the nozzle mechanism. Directly below, the lifting device can drive the locked cooperative mechanical arm to rise to make the long nozzle and the nozzle mechanism contact and seal. The invention has the advantages of high safety, high positioning accuracy, high success rate, long service life, short loading and unloading time of the long nozzle, and high production efficiency.

The invention discloses a filter buffer type intelligent regulating system of a sleeping air conditioner. The filter buffer type intelligent regulating system comprises a power supply, an air conditioner main body, a sleeping control circuit, a signal receiver and an intelligent wristband, wherein the air conditioner main body, the sleeping control circuit and the signal receiver are respectively connected with the power supply, and the intelligent wristband is connected with the signal receiver by virtue of a wireless network; the signal input end of the sleeping control circuit is connected with the signal receiver, the power input end of the sleeping control circuit is connected with the power supply, and the output end of the sleeping control circuit is connected with the air conditioner main body; a filter amplifying circuit is further connected between the signal receiver and the sleeping control circuit in series; a power supply buffer circuit is further arranged on the output end of the power supply, and the output end of the power supply buffer circuit is used as the new power supply output end. According to the filter buffer type intelligent regulating system of the sleeping air conditioner, the indoor temperature can be automatically regulated according to the sleeping depth of people, so that the people can sleep in a more comfortable environment, the living quality of the people is greatly increased, additionally, the air conditioner can be controlled to start and stop according to the environment temperature, and the use effect of a product is further increased.

The invention discloses a buffering type intelligent adjusting system for a sleep air conditioner power source. The buffering type intelligent adjusting system comprises the power source, an air conditioner body, a sleep control circuit, a signal receiver and an intelligent band, wherein the air conditioner body, the sleep control circuit and the signal receiver are connected with the power source, and the intelligent band is connected with the signal receiver through a wireless network. The signal input end of the sleep control circuit is connected with the signal receiver, the power input end of the sleep control circuit is connected with the power source, and the output end of the sleep control circuit is connected with the air conditioner body. The output end of the power source is further provided with a power source buffering circuit. According to the buffering type intelligent adjusting system for the sleep air conditioner power source, the indoor temperature can be automatically regulated and controlled according to the sleeping depth of people, people are made to have a more comfortable sleeping environment, and the living quality of people is greatly improved; and meanwhile the on-off states of an air conditioner can be adjusted according to the environment temperature, and the product using effect is further improved.

The invention discloses a high-durability electric fuel pump. The high-durability electric fuel pump comprises a one-way valve, a safety valve and the like, and is characterized by further comprising a semiconductor refrigerating chip, a temperature sensing probe, a sealing strip, slots, a controller and a pressure detecting valve; the one-way valve is mounted above a shell; the safety valve is mounted on one side of the one-way valve; the controller is mounted on one side of the one-way valve; a motor is mounted below the one-way valve; magnets are mounted on two sides of the motor; and the slots are formed in one sides of the magnets. The high-durability electric fuel pump is additionally provided with the temperature sensing probe for detecting the temperature of the motor; when the temperature of the motor is too high, the controller is triggered; the semiconductor refrigerating chip is operated for cooling the motor to prevent high-temperature operation to shorten the service life; the slots can be termly dismounted to clean the internal of the electric fuel pump to prevent damage caused by excessive internal impurities; and when the electric fuel pump is checked, the pressure detecting valve can directly observe the pressure index, so that the whole electric fuel pump has no need to be dismounted for inspection, and a lot of time is saved.