82results about How to "Achieve the purpose of silence" patented technology

The invention discloses an expansive type silencer and a fresh air system and relates to the technical field of indoor ventilating and exhausting equipment. The expansive type silencer and the fresh air system are invented for solving the problem that an existing expansive type silencer cannot be used for achieving broadband sound eliminating. The expansive type silencer comprises an expansion pipe. Connecting nozzles are arranged at the two ends of the expansion pipe. The area of the sections of the connecting nozzles is smaller than the area of the section of the expansion pipe. The expansion pipe comprises a fixed pipe section and a telescopic pipe section. The end, close to the fixed pipe section, of the telescopic pipe section is matched and connected with the fixed pipe section in a sleeving manner and can slide in the length direction of the fixed pipe section to adjust the length of the expansion pipe. The expansive type silencer is used for the fresh air system.

The invention relates to a phase-change and heat-storage heat preservation material and a production method thereof. The production method comprises the following steps: mixing paraffin wax, synthetic fatty acid, adipic acid, montan wax, crystal wax of heat storage materials accounting for 60 percent of the total weight in stirring and heating conditions according to a certain weight part ratio; raising the temperature to a certain value in atmospheric pressure; sequentially adding fire retardant, moisture repel, pour point depressant, stain control agent, mildew preventive and cement enhancer of adjustment materials accounting for 40 percent of the total weight under continuously stirring for reaction in a certain time; and keeping the temperature for 3 to 6 hours under continuously stirring, raising the temperature to 300 to 320 DEG C, keeping the temperature for few minutes, coating the materials to be finished goods when the temperature drops to be suitable for coating. The phase-change and heat-storage heat preservation material can become liquid phase so as to store heat energy when being heated (heat sources of sunlight, and the like) to achieve the saturation temperature; and when external temperature is lower than a set temperature, the phase-change and heat-storage material releases the heat energy, the phase-change material becomes solid phase from the liquid phase when the heat energy release is completed, and the process is repeated again and again for cycle.

The invention relates to the field of mufflers, and particularly provides a three-layer series micro-perforated pipe muffler which comprises a muffler body, an intake end and an exhaust end. The muffler body is of a three-layer micro-perforated pipe structure for muffling, aperture ranges from 0.1mm to 0.5mm, porosity is less than 5%, gaps are formed between three-layer micro-perforated pipes without being filled with filling materials, the three-layer micro-perforated pipes are different in aperture, equal in porosity and different in cavity volume, and noise in different frequency bands is eliminated. When the muffler is at work, airflow directly flows through a pipeline, and back pressure loss is low. The exhaust muffler is simple in structure, convenient to process and low in cost, and is resistant to high temperature, corrosion and airflow impact and long in service life as being of a pure-metal structure. The muffler has good muffling effect in the whole spectral range and particularly in high-frequency band, and muffling volume reaches 15-25dB.

The invention provides a noise reducing device, a manufacturing method thereof and a freezer and solves the problem of poor noise reducing effects in the prior art. According to the technical scheme, the noise reducing device comprises a tubular body, both ends of the tubular body are provided with necked openings, one of the necked opening is connected with a refrigerant inlet pipe, and the other necked opening is connected with a refrigerant outlet pipe; the inside of the tubular body is provided with at least one taper cap, the taper cap is provided with a plurality of silencing holes and at least two liquid separating holes. The invention also provides the manufacturing method of the noise reducing device and the freezer comprising the noise reducing device. The noise reducing device can fully release the pressure of jet flow of capillary pipes, diverse the jet flow through the taper cap to achieve gas-liquid separation, filter sound waves through the round holes in the taper cap, achieve reflection and attenuation of sound waves within a certain frequency band in a first chamber and a second chamber to effectively reduce noise, solve the problem of noise emission of the freezer system of a refrigerator and improve the auditory feeling of users.

Disclosed is an inorganic heat-storage, energy-saving and temperature-regulating wall material. The technical scheme includes that a certain quantity of high alumina cement, vitreous beads, aluminum silicate powder, bentonite, redispersible polymer powder, hydroxypropyl methyl cellulose, polypropylene fibers, starch ether 6200, gray calcium powder, water repellent or waterproofing agent, air-entraining agent and asbestos wool are mixed, and are sufficiently mixed in a cyclone separation manner and packaged to form a finished product. When heated (by heat sources such as sunlight and the like), the low-carbon heat-storage, energy-saving and automatic temperature-regulating wall material becomes liquid when reaching saturated temperature, and heat energy is stored; and when external temperature is lower than set temperature, the heat-storage material begins to release heat, after the heat is released thoroughly, the phase-change material becomes solid from the liquid, and the process runs in circle. The inorganic heat-storage, energy-saving and temperature-regulating wall material can be made into a section, a plate, mortar and a perforated brick, can absorb sound wave, is elastic, and vibrates, rebounds and reversely absorbs under sound wave impact, frequencies of the material are different, structural vibration is relieved, and the purpose of eliminating noise is achieved.

The invention discloses an environment-friendly automobile silencer filter which is characterized by comprising a silencer manifold and an inner silencing and filtering core arranged in the silencer manifold, wherein an intake pipe is arranged at one end of the silencer manifold, and an exhaust pipe is arranged at the other end of the silencer manifold; an air intake chamber and an exhaust chamber, which are mutually isolated, are arranged in the silencer manifold; the air intake chamber is connected with the intake pipe and is communicated with the intake pipe; the exhaust chamber is connected with the exhaust pipe and is communicated with the exhaust pipe; the inner silencing and filtering core is tubular and is arranged in the exhaust chamber of the silencer manifold; and one end of the inner silencing and filtering core is open, the other end of the inner silencing and filtering core is sealed, and the open end of the inner silencing and filtering core is penetrated into the air intake chamber and is communicated with the air intake chamber. The invention further discloses a silencing and filtering method. The environment-friendly automobile silencer filter can be used for silencing and cleaning the exhaust tail gas to achieve an environmental protection target.

The invention relates to the technical field of silencing equipment, in particular to a safety valve silencer. The safety valve silencer comprises a silencer body, an air inlet, an air outlet, a separation board, acoustic panels and air holes, wherein the air inlet is formed in one end of the silencer body; the air outlet is formed in the other end of the silencer body; the separation board is arranged at the upper end of the silencer body; at least three acoustic panels are arranged in the silencer body; the air holes are formed in the acoustic panels. The safety valve silencer has the advantages of simple, compact and reasonable structure, high convenience and quickness for assembly and reliable connection; the aim of silencing is achieved by disturbing air current and acoustic waves of the silencer, noises are reduced, and the working reliability of the silencer is greatly improved. The safety valve silencer has the advantages of smooth internal exhaust, low power loss, good silencing effect and high simplicity in application and popularization.

The invention relates to a high-speed silent life car for a lift. The high-speed silent lift car comprises a connecting lift car, wherein the connecting lift car comprises a movable fairing which consists of a fixed shield, multiple steering engines and a movable deformation cover; the fixed shield is arranged on the connecting lift car; the multiple steering engines are evenly distributed on thefixed shield; the movable deformation cover is formed by inserting and overlapping a plurality of fan-shaped plates; the lower end of each fan-shaped plate is fixed on the corresponding steering engine; each steering engine consists of a steering engine base, a balance wheel and a driving mechanism; the steering engine bases are fixed on the fixed shield; the balance wheels are arranged in the steering engine bases; the upper edges of the balance wheels and the lower ends of the fan-shaped plates are fixed; and the balance wheels are connected with the driving mechanisms. By adopting the technical scheme in the invention, when the lift car runs in different directions at a high speed, the shape of the lift car is correspondingly changed, thus reducing the advancement resistance, completely eradicating or lowering generation of eddy currents, ensuring interference-free running of the lift car for the lift, having no noise, and achieving the purpose of a silent lift car.

The invention relates to a light heat insulation construction material of solar energy phase transition heat accumulation, which has the following technical essentials: firstly, respectively adding acertain amount of phase transition heat accumulation and heat insulation material, common portland cement, fly ash, light expanded vermiculite powder, expanded water-hardened steel slag and cement reinforcing agent sequentially into a mixing trough; evenly mixing the materials by stirring at normal temperature; then, adding with stirring, a certain amount of impervious waterproof agent, redispersible latex powder as a bonding regulator, polypropylene cellulose as an antimitotic agent, starch ether and chlordene powder or SQ-8 algicide trichloro-propyl sulfate as an anti-mildew agent; fully mixing the materials evenly by cyclone separation; and packing the mixture to obtain a finished product. The material of the invention has good effects of heat insulation, heat accumulation and energy saving, light volume weight (345-650 kilograms / cubic meter), large density, high strength and small heat transfer coefficient. The fly ash which is a serious public nuisance is fully utilized as a renewable resource to produce the environment-friendly light heat insulation construction material of solar energy phase transition heat accumulation by fully utilizing the characteristics of the fly ash.

The invention relates to a solar automatic temperature control foamed cement building block for construction and a production method thereof, which have the following technical essentials: firstly, respectively stirring and evenly mixing a certain amount of phase transition heat accumulation and heat insulation material, common portland cement, fly ash, cement reinforcing agent, complexing agent and a proper amount of water at normal temperature; then, keeping stirring and adding a certain amount of foaming agent; casing the mixture into a building block in a mold after being evenly mixed; andstacking and preserving the building block for 25-30 days to obtain a finished product. The volume weight of the foamed building block of the invention is 1030kg / m<3>, which is 1.75 times smaller than that of the clay brick, and the weight of the foamed building block is greatly larger than that of the clay brick; the dimension is stable; the compression strength is larger than 10MPa; and the heat transfer coefficient is 0.00188.7W / M<2>K. In the invention, the building block wall board which is 370mm in thickness has the heat insulation performance equal to that of the clay brick which is 1887mm in thickness, and all the indexes conform to the 1.5 level standard. The invention utilizes the fly ash to produce the foamed building block and fully utilizes the solar radiation energy to save the energy resources.

The invention relates to the field of diesel generators, in particular to a soundproof outer cover of a mute generator set. The soundproof outer cover comprises a soundproof outer cover body arrangedoutside the generator set in a covering mode. The soundproof outer cover body is of a double-layer structure composed of an inner layer plate and an outer layer plate, thus a closed cavity is formed between the inner layer plate and the outer layer plate, the cavity is vacuumized to improve the soundproof effect of the soundproof outer cover, meanwhile, a sound-attenuation material layer is arranged on the face, facing the generator set, of the inner layer plate, part of noise from the generator set is absorbed through the sound-attenuation material layer, noise absorbing of the sound-attenuation material layer is matched with sound insulation of a vacuum layer, thus the noise of the generator set is greatly lowered, and the mute purpose is achieved .

The invention discloses an exhaust silencer of a compressor, and relates to the technical field of refrigeration equipment. The exhaust silencer is invented for solving the problems that in the prior art, an exhaust silencer of a compressor of a refrigeration device is large in size and high in material cost. The exhaust silencer of the compressor comprises a main pipe and a bypass pipe; and the main pipe is in series connection to an exhaust pipe of the compressor, one end of the bypass pipe is communicated with the main pipe, and the other end of the bypass pipe is provided with a blocking part. The exhaust silencer of the compressor can be used for the refrigeration device.

The invention discloses a noise reduction type air outlet hood for an extractor hood. The noise reduction type air outlet hood comprises a base and a hood body on the base and is characterized in thatthe hood body comprises an inner hood and an outer hood, the peripheral wall of the inner hood is provided with multiple noise reduction holes and the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes. The peripheral wall of the inner hood is provided with the multiple noise reduction holes, the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes, air columns in the noise reduction holes and air in the noise reduction cavities form an elastic resonance system, when a partof the noise frequency of the extractor hood is the same to the inherent frequency of the resonance system, the air columns in the noise reduction holes produce resonance and violent friction with thehole walls and through the friction, the acoustic energy is converted into heat energy so that the noise elimination is realized. The noise reduction type air outlet hood has good noise reduction andelimination effects based on the Helmholtz resonance sound elimination principle. According to the diversion form of the air outlet hood, the noise reduction effects on all parts of the air outlet hood are optimal.

The invention discloses a water-cooling silent frequency-variable microwave oven, and relates to the field of microwave ovens. The water-cooling silent frequency-variable microwave oven comprises a microwave oven body, an oven body outer cover and a magnetron installation cavity formed by the right side of the microwave oven body and the oven body outer cover, wherein a magnetron is installed in the magnetron installation cavity; the positive pole of the magnetron is sleeved with a water tank body with an annular water tank inside; the annular water tank surrounds the positive pole of the magnetron; the outer wall of the water tank body is provided with a water tank water inlet connector and a water tank water outlet connector communicated with the annular water tank; a water storage box is further arranged in the magnetron installation cavity and provided with a water storage box water inlet connector and a water storage box water outlet connector; the water tank water inlet connector is connected with the water storage box water outlet connector through a water pipe; the water tank water outlet connector is connected with the water storage box water inlet connector through a water pipe; a water pump is connected between the water tank water inlet connector and the water storage box water outlet connector in series. According to the water-cooling silent frequency-variable microwave oven, a large amount of heat generated in the work process can be cooled, the problem of noise is resolved, and the purpose of silence is realized.

A skylight motor beam assembly comprises a front beam, a rear beam and a first longitudinal beam, a second longitudinal beam and a third longitudinal beam which are arranged between the front beam and the rear beam and connected with the front beam and the rear beam. The front beam and the rear beam are each provided with a surveillance monitor. The surveillance monitors are connected with a display screen. The display screen is arranged inside a vehicle driving cab. The front beam, the rear beam, the first longitudinal beam, the second longitudinal beam and the third longitudinal beam are each coated with a sound deadening coating. Each sound deadening coating is prepared from, by weight, 30-40 parts of acrylic emulsion, 5-20 parts of aluminum fiber, 8-12 parts of water-based styrene-acrylic emulsion, 2-5 parts of silicone, 2-5 parts of a thickening agent, 3-5 parts of a dispersing agent, 2-5 parts of a plasticizing agent and 15-25 parts of water. The fiber diameter of the aluminum fiber ranges from 20 micrometers to 500 micrometers. The length of the fiber ranges from 1 mm to 30 mm. Due to the arrangement of the sound deadening coatings, noise in a skylight can be absorbed, the purpose of silencing can be achieved, and the comfort level can be improved.

The invention discloses an engine waste gas cycle purifying and silencing system. The engine waste gas cycle purifying and silencing system comprises a body which is internally provided with a cavity and vertically placed. An air inlet pipe is arranged on the side wall of the body. An exhaust pipe is arranged on the top of the body. A first partition plate and a second partition plate are connected to the inner wall of the cavity. The first partition plate is located above an air inlet and arranged horizontally. The second partition plate is connected to the tail end of the first partition plate and arranged vertically. A plurality of vertically arranged electrode plates are arranged between the side, close to the air inlet, of the second partition plate and the inner wall of the cavity. A plurality of vertically arranged dust collection plates are arranged between the side, away from the air inlet, of the second partition plate and the inner wall of the cavity. The inner wall of the cavity is provided with a horizontally arranged discharge electrode, and the discharge electrode is located above the first partition plate. An electrostatic generator is arranged outside the body and connected with the electrode plates, the dust collection plates and the discharge electrode. The engine waste gas cycle purifying and silencing system is simple in structure and convenient to operate, and the dust removal and purification effects are greatly improved while the silencing effect is ensured.

The invention relates to the technical field of noise reduction of an air conditioner, and particularly discloses a noise elimination and sound insulation device for an outdoor unit of an air conditioner. The noise elimination and sound insulation device for the outdoor unit of the air conditioner comprises a cover body covering the outdoor unit of the air conditioner, wherein an air inlet and anair outlet are arranged on the cover body, the air inlet is far away from the air outlet, and the air inlet is lower than the air outlet; a first space and a second space which are used for separatingthe space around the outdoor unit of the air conditioner are arranged in the cover body, the air inlet end of the first space communicates with the air inlet of the cover body, and the air outlet endof the first space communicates with the air inlet end of an air inlet grille of the outdoor unit of the air conditioner; the air inlet end of the second space communicates with the air outlet end ofa cooling fan of the outdoor unit of the air conditioner, and the air outlet end of the second space communicates with the air outlet of the cover body; and an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space. The scheme provided by the invention is used for solving the problems that in the prior art, the quality ofa sound environment where people live is reduced due to noise pollution caused by the operation of an outdoor unit of an air conditioner, and the normal sleep and rest of the people are seriously affected.

The invention discloses a method capable of reducing biogenic amine in a fermented sausage and application thereof. The method comprises the following steps that 1, according to sequences of amine production-correlated genes luxR of main amine production bacteria enterobacter aerogenes and enterobacter cloacae in the fermented sausage, small-interfering ribonucleic acid (siRNA) is designed and prepared; 2, the siRNA is used as an encapsulated matter for preparing lipidosome, so that the stable siRNA cationic liposome is obtained; 3, the siRNA cationic liposome is added into the fermented sausage according to a certain ratio in a fermentation early stage. According to the method, the flavor, color and lustre of the fermented sausage are not affected, and the effect of inhibiting the biogenic amine is significant, so that the method has important significance in controlling the biogenic amine in the fermented sausage.

The noise-eliminating cam has two modes of pendant mode and under-set mode in its structure, between upper base seat and lower base seat a slide block is set, the slide block and upper base seat are sliding-connected together, and on the end portion of sliding stroke a backward spring is connected, the undersurface of the upper base seat is equipped with guide bar, on the slide block a slide guide sleeve and a rolling shaft are matched, an accelerator is assembled on the lower base seat, the rolling shaft and the accelerator anjd formed into its noise-eliminating device, and its backward sring is a nitrogen spring, said invented noise-eliminating cam changes the original static friction contact into the sliding friction contact, so that its friction coefficient can be greatly reduced and can elimiante noise.

The invention discloses a modified IXPE anti-skid and silent PVC sheet floor and a production process thereof. The modified IXPE anti-skid and silent PVC sheet floor comprises an SPC substrate layer,the upper end of the SPC substrate layer is provided with a PVC decorative paper layer, the upper end of the PVC decorative paper layer is provided with a wear-resistant layer, the bottom of the SPC substrate layer is provided with an IXPE silent layer, the bottom of the IXPE silent layer is coated with anti-skid glue, an inner cavity of the SPC substrate layer is provided with a sound-proof cavity, the sound-proof cavity is internally provided with a sound insulation device, and the side surface of the SPC substrate layer is provided with a connecting pin. The IXPE silent layer is arranged, vibration and noise generated by the floor can be absorbed, and the silent aim is achieved; the bottom of the IXPE silent layer is coated with the anti-skid glue, the floor only needs to be stably placed during installation, and glue coating and backing film pasting are avoided, so that a product is capable of achieving the general anti-slip film back pasting effect, the slotting link for facilitating installation of the product is omitted, and installation is facilitated; and the sound-proof cavity is arranged, the sound insulation device is arranged, and therefore the aims of sound insulationand silencing are achieved.

The invention discloses an antifouling ceramic tile with a sound absorption / adsorption function. The antifouling ceramic tile with the sound absorption / adsorption function is composed of an intermediate layer and an outer wrapping layer, wherein the intermediate layer and the outer wrapping layer are both of a porous structure. The intermediate layer is nested in the outer wrapping layer, the outer wrapping layer is composed of a surface layer and a groove-shaped bearing layer, and the outer wrapping layer wraps the intermediate layer. The thickness, pore diameter and porosity of the intermediate layer are all greater than that of the outer wrapping layer. The invention further discloses a preparation method for the antifouling ceramic tile with the sound absorption / adsorption function. According to the antifouling ceramic tile with the sound absorption / adsorption function and the preparation method thereof, a nested structure is adopted, the porosity of the intermediate layer is higher than that of the outer wrapping layer, The sound absorption, adsorption and antifouling functions are realized effectively, and the antifouling ceramic tile is high in strength and easy to pave andpaste. The preparation method is simple, raw materials are easy to obtain, formed pug is good in plasticity and ductility, and easy to form and sinter, products are stable in quality and quite good inperformance, and the progress and application development of functional ceramic tile technology is facilitated.

A door stopper with a buffering function comprises a base, a tension spring, a rotary disc, a first anti-collision strip, a second anti-collision strip and a positioning disc. The door stopper with the buffering function is characterized in that a pressing disc is arranged on the base, and public base through holes are formed in the base and the pressing disc; a rotatable center column is arrangedin the center of the base, a base spring positioning column is arranged beside the center of the base, the center column and the rotary disc are fixed together, and the rotary disc is limited betweenthe base and the pressing disc; the two ends of the tension spring are respectively fixed on a rotary disc positioning column and the base spring positioning column; the rotary disc can rotate properly under the limitation of the tension spring; a rotary disc head is arranged at the upper end of the center column, and the first anti-collision strip, first magnetic steel, second magnetic steel anda first alignment line are arranged on the rotary disc head; a stand column is arranged on the positioning disc, and a positioning hole is formed in the positioning disc; and the stand column is provided with a platform, and the platform is provided with the second anti-collision strip, third magnetic steel, fourth magnetic steel and a second alignment line. According to the door stopper with thebuffering function, when a door leaf touches the door stopper, buffering can be achieved, and the purpose of silence is achieved.

A CPU radiator for computer mainframe relates to computer technology field. It contains radiation fin and touch panel for conducting heat by contacting CPU. Structural feature is said touch panel being copper plate with heat tube s, each heat tube another end interpenetration in a row of radiation fins which are abutted against to power supply fan. Compared with current technology, the present invention has low noises, fast heat radiation, and noise without undulation along with systems operation program and environmental temperature variation.

An ultra-low-noise mining local fan comprises an outlet silencer, a main machine body and an inlet silencer. The main machine body comprises a motor, an impeller, an inner shell and an outer shell. The inlet silencer comprises a flow collector, a silencing wall, a silencing barrel, a side air inlet and an air inlet cover plate. The ultra-low-noise mining local fan has the beneficial effects that the inner shell and the outer shell are connected and fixed through elastic materials, and radiation noise of the main machine outer shell is greatly lowered; the inlet silencer achieves the purpose of primary silencing through section area changes and sudden expansion or shrinkage of the pipeline section; when sound waves enter the silencing wall, one part of sound energy is subjected to friction in gaps of porous materials and is converted into heat energy to be dissipated, and therefore the purpose of secondary silencing is achieved; after the silencing wall is blocked by dust, the silencing wall can be very conveniently pulled out to be cleaned or replaced, the silencing effect is kept, and the overhauling time is short; and after part of sound waves at the position of a sound source reach a side air inlet hole plate, one part of the sound waves are absorbed by the silencing material, and accordingly the purpose of tertiary silencing is achieved.

The invention relates to the technical field of silencing equipment, particularly to a muffler. The muffler comprises a muffler body, an air inlet, an air outlet, a silencing silk screen, a main pipe, an air outlet pipe and an assistant cavity, wherein the air inlet is formed in one end of the muffler body, and the air outlet is formed in the other end of the muffler body; the silencing silk screen is arranged between the outer wall and the inner wall of the muffler body; the air inlet is connected with the main pipe; the main pipe is connected with the assistant cavity through the air outlet pipe. The novel muffler is simple, compact and reasonable in structure, convenient and quick to assemble, and reliable in connection, the purpose of silencing is realized by changing the direction of air flow, the noise is reduced, air inlet and exhaust in the muffler are smooth, the power consumption is small, the silencing effect is good, the operation reliability of the muffler is greatly improved, and the muffler is easy to use and popularize.

The invention discloses a silent steering wheel which comprises a first steering shaft, a steering shaft sleeve, a first gear, a second gear, a second steering shaft, a third gear, a turbine; whereinthe lower part of the first steering shaft is provided with straight teeth, one side of the steering shaft sleeve extends outwards to form a containing opening; the first gear is fixedly arranged on the first steering shaft and located in the steering shaft sleeve; the second gear is arranged in the accommodating opening and is rotationally connected with the accommodating opening; the second gearis meshed with the first gear; the second steering shaft is arranged on one side of the first steering shaft, and the second steering shaft is connected with a steering transmission mechanism; the third gear is fixedly arranged on the second steering shaft and is meshed with the second gear; the turbine is arranged on the lower portion of the first steering shaft and meshed with the straight teeth to drive the motor, and the power output end of the turbine is connected with the turbine. The steering wheel can be combined with and separated from an automobile transmission mechanism, and the purpose of silence of the steering wheel is achieved. The invention further provides a control method of the silent steering wheel.

The invention relates to a silent lock which comprises a lock body and a lock catch plate. The lock body comprises a lock box, a spring bolt assembly, a toggle block and a handle. The handle is connected with the toggle block and can drive the toggle block to rotate, the toggle block is in linkage with the spring bolt assembly for driving the spring bolt assembly to stretch and retract, the lock catch plate is provided with a cavity for limiting a spring bolt, the lock body is further provided with a clamping block, and the clamping block can be rotationally fixed in the lock box. The silent lock has an unlocked state and a locked state. In the unlocked state, the front end of the spring bolt is located in the lock box, and the clamping block is clamped to the toggle block. In the locked state, the front end of the spring bolt protrudes out of the lock box, the clamping block is disengaged from the toggle block, and the clamping block is used for switching the locked state and the unlocked state of the silent lock. The spring bolt can be automatically sprung out while being locked, automatic locking is achieved, safety is improved, and silent locking and unlocking are achieved.