Noise reducing pressure relief air pump

Abstract

The application discloses a kind of noise reduction pressure relief air pump, belong to air pump technical field, including pump body assembly, transmission assembly, piston assembly, valve group assembly, noise reduction pressure relief assembly and filter sound reduction assembly, pump body assembly built-in integrated flow buffer air chamber, transmission assembly drives piston assembly reciprocating motion in pump cavity, valve group assembly controls airflow in and out, noise reduction pressure relief assembly is communicated with flow buffer air chamber to realize smooth pressure relief, filter sound reduction assembly is respectively set in air inlet channel and pressure relief channel.The application is integrated with flow buffer air chamber in the pump body, cooperates with the collaborative design of dust sound-absorbing cotton in air inlet end, pressure relief channel noise reduction filter element, realizes noise reduction from airflow buffer, dust filtration, noise suppression multidimension, solves the problem that existing air pump turbulent flow is loud, pressure relief sound is piercing, needs additional assembly flow buffer air bottle, cost is high, simultaneously improves air pump sealing and operating reliability, compact structure, assembly is simple, applicable to noise sensitive various gas scenes.

Description

Technical Field

[0001] This invention belongs to the field of air pump technology, specifically relating to a noise-reducing and pressure-relief air pump, which is particularly suitable for scenarios with strict requirements on operating noise and frequent pressure relief, such as medical equipment, laboratory instruments, smart homes and other fields. Background Technology

[0002] Air pumps, as commonly used fluid transport devices, compress and transport gas through the reciprocating motion of a piston, and are widely used in various production and daily life scenarios. However, existing air pumps have many technical shortcomings during operation:

[0003] High turbulent noise: After the piston of the existing air pump compresses the gas, the airflow is directly discharged from the outlet. The turbulence formed by the high-speed airflow will generate obvious noise. In order to reduce this noise, a slow-flow gas cylinder needs to be installed at the front end of the outlet, which not only increases the production and assembly cost, but also leads to the increase in equipment size and reduced portability.

[0004] The pressure relief noise is ear-piercing: During the pressure relief process, the high-pressure airflow passes through the pressure relief valve quickly, which will produce a rapid whistling noise, similar to radio wave pulses, which affects the user experience, especially in a quiet environment where the drawbacks are more prominent.

[0005] Insufficient reliability: The air intake channel lacks an effective filtration structure, allowing dust in the air to easily enter the pump chamber and adhere to the valve sealing surface, resulting in a decrease in valve sealing performance and affecting the working efficiency and service life of the air pump.

[0006] Unreasonable structural design: The additional slow-flow gas cylinder and the gas pump body are separate structures, which makes the assembly process cumbersome, increases production and management costs, and the connection is prone to loosening during transportation or use, affecting the stability of the equipment.

[0007] Therefore, developing a noise-reducing and pressure-relief air pump that integrates slow-flow function, has significant noise reduction effect, compact structure, and high reliability has become the key to solving the above problems. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a noise-reducing and pressure-relief air pump. By integrating a slow-flow air chamber into the pump body, and coordinating the design of dustproof and sound-absorbing cotton at the air inlet and noise-reducing filter element in the pressure relief channel, noise reduction is achieved from multiple dimensions such as airflow buffering, dust filtration, and noise suppression. At the same time, the structure is simplified, the cost is reduced, and the operational reliability and user experience of the air pump are improved.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] This invention discloses a noise-reducing and pressure-relief air pump, the core of which consists of a pump body assembly, a transmission assembly, a piston assembly, a valve assembly, a noise-reducing and pressure-relief assembly, and a filter and silencing assembly. These components work together organically to achieve gas compression, slow flow, filtration, noise reduction, and stable pressure relief. The overall structure is compact and highly integrated. The specific structure and connection relationships are as follows:

[0011] Pump body assembly

[0012] The pump body assembly is the basic load-bearing structure of the air pump, used to mount and fix other components and form a sealed airflow channel. It includes a lower bracket, a valve bracket body, and a sealing cover.

[0013] The lower support is a metal frame structure used to support components such as the motor and piston bracket, ensuring the overall structural stability of the air pump;

[0014] The valve frame body is an integrated injection-molded part, fixed to the upper end of the lower support. It contains three core cavities: a pump chamber, an outlet chamber, and a slow-flow chamber. The pump chamber accommodates the piston and provides compression space; the outlet chamber temporarily stores compressed gas; and the slow-flow chamber is a cylindrical cavity with a volume 3-5 times that of the outlet chamber, used to buffer and decelerate the airflow. Four evenly distributed channel holes (2-5mm in diameter) are provided between the outlet chamber and the slow-flow chamber. These four holes evenly distribute the high-pressure airflow into the slow-flow chamber, preventing turbulence noise caused by high-speed single-point injection and ensuring that the compressed gas flows evenly and smoothly from the outlet chamber into the slow-flow chamber. One side of the valve frame body has a pressure relief port (connected to the slow-flow chamber) and an air inlet (connected to the pump chamber), used for pressure relief and air intake, respectively.

[0015] ◦ The sealing cap fits onto the upper end of the valve frame body and is sealed with a sealing gasket to form a closed airflow cavity, preventing gas leakage.

[0016] Transmission components

[0017] The transmission assembly is the power transmission structure of the air pump, used to convert the rotary motion of the motor into the reciprocating linear motion of the piston. It includes the motor, eccentric wheel, drive shaft, and crank.

[0018] ◦ The motor is a DC brushless motor, fixed at the lower end of the lower bracket. The output shaft is fixed to the eccentric wheel by a key connection, providing a power source for the air pump;

[0019] ◦ An eccentric wheel is mounted on the motor output shaft, with an eccentricity of 3~8mm, and is used to convert rotary motion into eccentric oscillation;

[0020] One end of the drive shaft is rolled into the shaft hole of the eccentric wheel with clearance, and the other end is fitted into the shaft hole of the crank, which plays the role of transmitting power.

[0021] ◦ The crank is a lever structure, with the end away from the drive shaft hinged to the piston handle of the piston assembly, realizing the direction and transmission of power, and driving the piston to slide back and forth along the pump chamber.

[0022] Piston assembly

[0023] The piston assembly is the gas compression actuator of the air pump, including a piston support, piston, and piston stem.

[0024] ◦ The piston support is fixed inside the lower support and is used to guide and limit the reciprocating motion of the piston;

[0025] The piston is hinged to the end of the crank away from the drive shaft via the piston handle. The piston is fitted into the pump chamber with a clearance of 0.01~0.03mm between the piston and the pump chamber. The piston surface is coated with polytetrafluoroethylene to reduce motion friction. The piston slides back and forth along the pump chamber under the drive of the crank to realize the intake and compression of gas.

[0026] Valve assembly

[0027] The valve assembly is the airflow control structure of the air pump, used to control the unidirectional entry and exit of gas. It includes four valve combinations, each consisting of a parapet valve and a sealing plate.

[0028] The umbrella valve has a flexible valve body and is installed on the valve seat of the valve frame body by a sealing plate. The four sets of valves control the air inlet and outlet of the pump chamber respectively, so as to realize the unidirectional flow of gas and prevent the airflow backflow.

[0029] Noise reduction and pressure relief components

[0030] The noise reduction and pressure relief assembly is a pressure relief control and noise reduction structure for the air pump, used to achieve smooth pressure relief and reduce pressure relief noise. It includes a pressure relief seal, pressure relief spring, pressure relief cover, adjustable nut, and guide rail.

[0031] - The pressure relief cover is fixed to the pressure relief port of the valve frame body by a threaded connection, forming the outer shell of the pressure relief channel;

[0032] - The pressure relief seal is an elastic sealing head made of nitrile rubber or silicone rubber, which is adapted to be installed in the pressure relief port. Its end face has a sealing protrusion to form a tight sealing fit with the pressure relief port.

[0033] - The guide rail is located between the pressure relief seal and the pressure relief spring. One end is fixedly connected to the pressure relief seal, and the other end abuts against the pressure relief spring. The guide rail column and the center hole of the adjustable nut are coaxial and precisely slidingly fitted to ensure that the pressure relief seal only moves in a straight line along the axial direction without radial offset, jamming, or uneven wear.

[0034] - One end of the pressure relief spring abuts against the pressure relief seal / guide rail, and the other end is fixed to the pressure relief cover by an adjustable nut. The adjustable nut is threaded with the pressure relief cover. By rotating the adjustable nut, the preload of the pressure relief spring can be adjusted, thereby adjusting the pressure relief pressure. When the air pressure in the slow-flow chamber reaches the set threshold, the gas pushes the pressure relief seal, and under the constraint of the guide rail, it smoothly compresses the pressure relief spring. The pressure relief port opens evenly to achieve pressure relief. Because the airflow is buffered by the slow-flow chamber and the guide rail ensures smooth movement, the pressure relief process is more stable and the noise is lower.

[0035] Filtering and noise reduction components

[0036] The filtration and noise reduction assembly is a filtration and intake noise reduction structure for the air pump, including dustproof and sound-absorbing cotton and a noise-reducing filter element:

[0037] ◦ The dustproof and sound-absorbing cotton is made of polyester fiber with a thickness of 5~10mm. It has a waterproof and breathable membrane on the surface. It is installed at the air inlet of the valve frame body and covers the front end of the air inlet channel. It is used to filter dust in the air, prevent dust from entering the pump cavity and affecting the valve sealing, and at the same time slow down the high-speed airflow and eliminate the air noise generated during the air intake process.

[0038] The noise reduction filter element is a 50μm PE sintered air filter element, which is installed at the front end of the pressure relief channel and connected to the pressure relief port of the slow flow air chamber. It is used to further buffer the airflow during pressure relief and eliminate the rapid noise generated when high pressure gas passes through the pressure relief port.

[0039] The pressure relief channel adopts a dual-hole air outlet structure. The airflow is dispersed through the multi-pore noise reduction filter element and then discharged through the dual holes, achieving double deceleration and noise reduction, completely eliminating the harsh whistling sound during pressure relief.

[0040] The core innovations of this invention focus on the integrated slow-flow air chamber design and the multi-dimensional filtration and noise reduction design. These innovations work synergistically to achieve significant noise reduction and performance improvement, as detailed below:

[0041] Innovation Point 1: The integrated slow-flow air chamber design (with 4 uniformly spaced channels between the outlet chamber and the slow-flow air chamber for better flow diversion and guidance, suppressing turbulence at its source) reduces turbulence noise from the root.

[0042] Existing air pumps do not have a slow-flow air chamber and require an additional slow-flow air cylinder. However, this invention integrates a slow-flow air chamber within the valve frame body, which is connected to the air outlet chamber through four evenly distributed channel holes.

[0043] During operation, the high-pressure gas generated by the piston's rapid compression first enters the exhaust chamber, and then flows evenly and smoothly into the slow-flow chamber through the channel hole. The large-capacity design of the slow-flow chamber (3 to 5 times that of the exhaust chamber) allows the high-speed airflow to be fully buffered and slowed down, effectively reducing the noise generated by turbulence.

[0044] Actual test data shows that, compared with traditional air pumps without a slow-flow chamber, the operating noise of this invention is reduced from 43dB to 35dB, demonstrating a significant noise reduction effect. At the same time, the integrated design eliminates the need for additional assembly of slow-flow gas cylinders, reducing production and assembly costs, decreasing equipment size, and improving structural stability.

[0045] Innovation Point Two: A PE sintered air filter element is added to the front end of the pressure relief channel (combined with the dual small hole structure of the pressure relief channel, the filter element disperses airflow and the small holes restrict airflow for dual noise reduction, resulting in a gentler airflow during pressure relief), eliminating the whistling noise during pressure relief.

[0046] ◦ When existing air pumps depressurize, high-pressure airflow passes rapidly through the depressurization valve, generating a rapid noise similar to an electromagnetic pulse. In contrast, this invention installs a 50μm PE sintered air filter element at the front end of the depressurization channel.

[0047] During pressure relief, the airflow, after being buffered by the slow-flow chamber, first passes through the PE sintered air filter. The porous structure of the filter further disperses the airflow and slows down the flow rate, eliminating the air noise generated when high-pressure gas passes through the pressure relief port, making the pressure relief process more stable and quiet.

[0048] Innovation Point 3: Dustproof and sound-absorbing cotton is added to the front end of the air intake channel to achieve the dual functions of filtration and noise reduction during air intake.

[0049] ◦ Existing air pumps lack effective filtration and noise reduction structures in their air intake channels, making it easy for dust to enter the pump chamber and generating air noise during air intake. This invention installs dustproof and sound-absorbing cotton made of polyester fiber at the front end of the air intake channel.

[0050] The fiber structure of the dustproof and sound-absorbing cotton can effectively filter dust in the air, prevent dust from adhering to the valve sealing surface, and ensure the valve's sealing performance and the air pump's operational reliability. At the same time, the sound-absorbing cotton can slow down the high-speed airflow generated when the piston draws in air, eliminate airflow noise and whistling at the air inlet, and further improve the overall noise reduction effect.

[0051] Innovation Point 4: The pressure relief assembly is equipped with a coaxial guide rail to improve the consistency of pressure relief movement and sealing reliability.

[0052] - In traditional pressure relief structures, the pressure relief seal and spring are not guided and constrained, which can easily lead to radial offset, tilting, and jamming, resulting in poor sealing, air leakage, abnormal noise, or increased noise. The present invention adds a guide rail between the pressure relief seal and the pressure relief spring, and the guide rail post is coaxially and precisely matched with the center hole of the adjustable nut.

[0053] During the depressurization and resetting process, the guide rail forcibly constrains the depressurization seal and the depressurization spring to only perform axial linear motion, completely eliminating radial movement and misalignment. This ensures uniform contact between the sealing end face and the depressurization port, precise resetting, significantly improving depressurization stability, seal life, and motion consistency, and further reducing mechanical and airflow noise during depressurization.

[0054] Working principle

[0055] The noise-reducing and pressure-relief air pump of the present invention operates in four stages: air intake, compression, slow flow, and exhaust / pressure relief, as detailed below:

[0056] Intake stage: The motor starts, driving the eccentric wheel to rotate. Through the transmission shaft and crank, the piston is driven to slide downward along the pump chamber, creating a negative pressure inside the pump chamber. The umbrella valve on the intake side opens, and outside air enters the pump chamber through the intake channel after being filtered by the dustproof and sound-absorbing cotton. During this process, the dustproof and sound-absorbing cotton slows down the high-speed intake airflow and eliminates intake noise.

[0057] Compression stage: The motor continues to drive the piston to slide upward along the pump chamber, the gas in the pump chamber is compressed, the inlet side umbrella valve is closed, the outlet side umbrella valve is opened, and the compressed gas is forced into the outlet chamber.

[0058] Slow flow stage: The compressed gas in the outlet chamber is evenly distributed and smoothly flows into the slow flow chamber through 4 uniform channel holes. The high-speed airflow is fully buffered and decelerated, and the turbulence noise is significantly reduced.

[0059] Exhaust / Depressurization Stage: If the gas path requires gas, the gas in the slow-flow gas chamber is output through the exhaust channel; if the gas path pressure is too high, when the gas pressure in the slow-flow gas chamber reaches the set threshold, the gas pushes the pressure relief seal, and under the coaxial guidance of the guide rail, it smoothly and linearly compresses the pressure relief spring, and the pressure relief port opens evenly. After being buffered by the porous PE sintered noise reduction filter element, the gas is smoothly discharged through the two small holes of the pressure relief channel without any rapid gas whistling or mechanical noise, making the pressure relief quieter; when the gas pressure drops below the set value, the pressure relief spring precisely pushes the pressure relief seal to reset under the constraint of the guide rail, and the sealing end face is completely in contact with the pressure relief port without deviation or jamming, ensuring reliable sealing and completing one pressure relief cycle.

[0060] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0061] 1. Significant noise reduction effect: Through the coordinated design of integrated slow-flow air chamber, pressure relief channel PE sintered filter element, and air intake channel dustproof and sound-absorbing cotton, all-round noise reduction is achieved from three dimensions: airflow buffering, pressure relief noise reduction, and air intake noise reduction. The operating noise is reduced from 43dB of traditional air pump to 35dB, and there is no sudden air noise when pressure is released, which greatly improves the user experience.

[0062] 2. Compact structure and reduced cost: The integrated slow-flow gas chamber design of the pump body eliminates the need for additional assembly of slow-flow gas cylinders, reducing production and assembly costs and equipment size, and improving structural stability and portability.

[0063] 3. High operational reliability: The dustproof and sound-absorbing cotton in the air intake channel can effectively filter dust in the air, prevent dust from adhering to the valve sealing surface, ensure valve sealing, and extend the service life of the air pump;

[0064] 4. Stable and controllable pressure relief: The pressure relief component adopts an elastic sealing head and an adjustable spring structure, which can precisely adjust the pressure relief pressure by rotating the adjustable nut. The pressure relief process is stable, without pressure changes or gas leakage.

[0065] 5. Wide adaptability: With its compact structure, low noise, and high reliability, it is suitable for various noise-sensitive gas usage scenarios such as medical equipment, laboratory instruments, smart homes, and small pneumatic equipment, and has broad engineering application value. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a three-dimensional structural schematic diagram of the noise reduction and pressure relief air pump of the present invention;

[0068] Figure 2 This is an exploded view of the noise-reducing and pressure-relief air pump of the present invention;

[0069] Figure 3 The noise level of the noise-reducing and pressure-relief air pump of the present invention without a silencer chamber is shown in the diagram.

[0070] Figure 4 The noise level of the noise-reducing and pressure-relief air pump of the present invention is shown in the diagram with a silencing chamber.

[0071] Figure 5 This is a cross-sectional view of the noise-reducing and pressure-relief air pump of the present invention;

[0072] Figure 6 for Figure 5 A partially enlarged sectional view of section A;

[0073] Figure 7 This is a cross-sectional view of the pressure relief channel and noise reduction filter element assembly of the present invention;

[0074] In the above figures, 1-motor, 2-sealing plate, 3-lower bracket, 4-eccentric wheel, 5-lever shaft, 6-crank, 7-piston, 8-piston bracket, 9-umbrella valve, 10-sealing cover, 11-pressure relief seal, 12-sealing gasket, 13-pump nozzle, 14-pressure relief spring, 15-pressure relief cover, 16-spring buckle, 17-noise reduction filter element, 18-valve frame body, 19-dustproof and sound-absorbing cotton, 20-slow flow air chamber, 21-air outlet chamber, 22-channel hole, 23-pump chamber, 24-air inlet, 25-pressure relief port. Detailed Implementation

[0075] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0076] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0077] Example 1: Structural Assembly of the Air Pump

[0078] Component preparation:

[0079] Pump body assembly: The lower bracket is made of aluminum alloy, and the valve frame body is integrally injection molded from ABS. Internally, it includes a pump chamber (30mm diameter), an outlet chamber (50mL volume), and a slow-flow chamber (200mL volume). Four 3mm diameter channel holes are provided between the outlet chamber and the slow-flow chamber. The sealing cover is made of transparent PC material, and a fluororubber sealing gasket is fitted between it and the valve frame body. Four uniform 3mm diameter channel holes are provided between the outlet chamber and the slow-flow chamber for flow diversion and buffering (see...). Figure 5 );

[0080] Transmission components: A DC brushless motor with a rated voltage of 12V and a power of 30W is selected. The eccentric wheel has an eccentricity of 5mm. The transmission shaft is made of stainless steel and the crank is an aluminum alloy forging.

[0081] Piston assembly: The piston holder is made of engineering plastic, the piston is made of nitrile rubber with a polytetrafluoroethylene coating, the piston-pump chamber clearance is 0.02mm, and the piston stem is made of stainless steel.

[0082] Valve assembly: The umbrella valve is made of silicone rubber, and the sealing sheet is made of polypropylene. A total of four valve assemblies are assembled, corresponding to the air inlet and outlet control respectively.

[0083] Noise Reduction and Pressure Relief Components: The pressure relief seal is made of nitrile rubber, the pressure relief spring is made of stainless steel (stiffness 2N / mm), the pressure relief cover is made of aluminum alloy, the adjustable nut is made of brass, the guide rail is made of engineering plastic, the outer diameter of the guide rail post and the inner diameter of the center hole of the adjustable nut are precisely fitted with a clearance, with a coaxiality error ≤0.02mm, and the pressure relief channel has a double small hole structure, which works in conjunction with the noise reduction filter to disperse exhaust (see...). Figure 6 );

[0084] Filtering and noise reduction components: The dustproof and noise-reducing cotton is made of polyester fiber (8mm thick, with a waterproof and breathable membrane on the surface), and the noise reduction filter element is a 50μm PE sintered air filter element.

[0085] Assembly process:

[0086] Step 1: Fix the motor to the lower end of the bracket, and mount the eccentric wheel on the motor output shaft and secure it with a key;

[0087] Step 2: Fix the piston bracket inside the lower bracket, hinge the piston to the crank through the piston handle, then connect the crank to the drive shaft, and mate the other end of the drive shaft with the eccentric wheel shaft hole;

[0088] Step 3: Install the four valve sets (umbrella valve + sealing plate) onto the valve seat of the valve frame body to complete the valve assembly assembly;

[0089] Step 4: Fix the valve bracket body to the upper end of the lower bracket, ensuring that the piston is properly fitted into the pump chamber;

[0090] Step 5: Install the dustproof and sound-absorbing cotton at the air inlet of the valve frame body, and install the noise reduction filter at the front end of the pressure relief channel;

[0091] Step 6: Install the pressure relief seal, guide rail, and pressure relief spring into the pressure relief port in sequence, aligning the guide rail with the center hole of the adjustable nut. Cover with the pressure relief cover and adjust the preload of the pressure relief spring using the adjustable nut (set the pressure relief pressure to 80 kPa).

[0092] Step 7: Install the sealing gasket on the upper end of the valve frame body, cover and tighten the sealing cover to complete the overall assembly.

[0093] Example 2: Operational testing and performance verification of the air pump

[0094] The assembled noise-reducing and pressure-relief air pump underwent operational testing in a quiet laboratory (background noise ≤30dB) at a distance of 50cm. The specific test results are as follows:

[0095] Noise test:

[0096] When operating under no load, the air pump operates at a noise level of 35dB, which is 8dB lower than that of a traditional air pump without a slow-flow chamber (43dB).

[0097] During the depressurization process, the peak noise level was 38dB with no obvious whistling noise, while the peak noise level of a traditional air pump during depressurization reached 55dB and there was rapid pulse noise.

[0098] After running continuously for 1 hour, the noise level remained stable between 34 and 36 dB, with no significant fluctuations.

[0099] Filtration effect test:

[0100] After the air pump ran continuously for 24 hours in a dusty environment (dust concentration 50mg / m³), the pump chamber and valve assembly were disassembled and inspected. No dust was found to be attached, the valve sealing surface remained clean, and the air pump exhaust pressure did not drop significantly, proving that the dustproof and sound-absorbing cotton had a good filtration effect.

[0101] Pressure relief stability test:

[0102] The air circuit pressure is set to 80 kPa. The air pump automatically depressurizes. Under the constraint of the guide rail, the depressurization process lasts for 0.5 seconds. The pressure drops smoothly from 80 kPa to 60 kPa without pressure changes, radial offset, or jamming. After 100,000 consecutive depressurization cycles, the depressurization action is consistent and the noise fluctuation is ≤1 dB. After depressurization, the depressurization seal quickly and accurately resets, with no gas leakage.

[0103] Lifespan test:

[0104] The air pump ran continuously for 1000 hours, during which its various performance parameters were tested regularly. The operating noise, exhaust pressure, and pressure relief pressure remained stable without any malfunctions, proving that the air pump has high reliability.

[0105] Example 3: Performance comparison with traditional air pumps (e.g.) Figure 3 , Figure 4 (As shown)

[0106] The following table compares the core performance of the noise-reducing and pressure-relief air pump of this invention with that of a traditional air pump:

[0107]

[0108] The comparison results show that the noise-reducing and pressure-relief air pump of the present invention is significantly superior to traditional air pumps in terms of noise control, structural compactness, operational reliability, and production cost.

[0109] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A noise-reducing and pressure-relief air pump, characterized in that, It includes pump body assembly, transmission assembly, piston assembly, valve assembly, noise reduction and pressure relief assembly, and filter and silencer assembly. The components work together to achieve airflow compression, slow flow noise reduction, and stable pressure relief. The pump body assembly includes a lower support, a valve frame body, and a sealing cover. The valve frame body is fixed to the upper end of the lower support, and the sealing cover covers the upper end of the valve frame body to form a sealed cavity. The valve frame body has a pump chamber, an air outlet chamber, and a slow-flow air chamber inside. There are four evenly distributed channel holes between the air outlet chamber and the slow-flow air chamber. The pump chamber is connected to the air outlet chamber. A pressure relief port and an air inlet are provided on one side of the slow-flow air chamber. The transmission assembly includes a motor, an eccentric wheel, a transmission shaft, and a crank. The motor is fixed to the lower end of the lower bracket. The eccentric wheel is fitted onto the motor output shaft. One end of the transmission shaft is rolled with the shaft hole of the eccentric wheel with clearance, and the other end is fitted into the shaft hole of the crank. The end of the crank away from the transmission shaft is connected to the piston assembly. The piston assembly includes a piston support, a piston, and a piston handle. The piston support is fixed in the lower support. The piston is hinged to the end of the crank away from the drive shaft via the piston handle. The piston is adapted to be installed in the pump chamber and can slide back and forth along the pump chamber. The valve assembly includes four valve combinations installed inside the valve frame body. Each valve combination includes a parapet valve and a sealing plate. The parapet valve is limited and installed at the valve seat of the valve frame body by the sealing plate. The four valve combinations respectively control the air inlet and outlet of the pump chamber. The noise reduction and pressure relief assembly includes a pressure relief seal, a pressure relief spring, a pressure relief cover, and an adjustable nut. The pressure relief cover is fixed at the pressure relief port of the slow-flow air chamber. The pressure relief seal is adapted and installed inside the pressure relief port. One end of the pressure relief spring abuts against the pressure relief seal, and the other end is limited and fixed to the pressure relief cover by the adjustable nut. The pressure relief seal and the pressure relief port form a sealing fit. The filtration and noise reduction assembly includes dustproof and noise-reducing cotton and a noise-reducing filter element. The dustproof and noise-reducing cotton is installed at the air inlet of the valve frame body and covers the front end of the air inlet channel. The noise-reducing filter element is a 50μm PE sintered air filter element, which is installed at the front end of the pressure relief channel and connected to the pressure relief port of the slow-flow air chamber. The pressure relief channel has a dual-hole air outlet structure, which works in conjunction with the noise reduction filter to achieve distributed pressure relief and noise reduction.

2. The noise reduction and pressure relief air pump according to claim 1, wherein the slow-flow air chamber is a cylindrical cavity with a volume of 3 to 5 times that of the air outlet chamber, and the diameter of the channel hole is 2 to 5 mm, which is evenly distributed on the connecting end face of the air outlet chamber and the slow-flow air chamber to achieve uniform diversion and buffering of high-pressure airflow.

3. The noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The pressure relief seal is an elastic sealing head made of nitrile rubber or silicone rubber, and the end face of the pressure relief seal and the contact surface of the pressure relief port are provided with sealing protrusions.

4. The noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The dustproof and sound-absorbing cotton is made of polyester fiber with a thickness of 5-10mm and has a waterproof and breathable membrane on the surface.

5. The noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The valve frame body, the lower support, and the sealing cover are all equipped with sealing gaskets, which are made of fluororubber.

6. The noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The motor is a brushless DC motor, and the output shaft is fixed to the eccentric wheel by a key connection. The eccentricity of the eccentric wheel is 3~8mm.

7. The noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The clearance between the piston and the pump chamber is 0.01~0.03mm, and the piston surface is coated with polytetrafluoroethylene.

8. A noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The pressure relief cover is connected to the valve frame body by a thread, and the adjustable nut is threaded with the pressure relief cover. The preload of the pressure relief spring can be adjusted by rotating the adjustable nut.

9. A noise-reducing and pressure-relief air pump according to claim 1, characterized in that, The noise reduction and pressure relief assembly also includes a guide rail, which is disposed between the pressure relief seal and the pressure relief spring. The guide rail post and the center hole of the adjustable nut are coaxially arranged and precisely slidably fitted to limit the axial movement trajectory of the pressure relief seal and the pressure relief spring, ensuring the coaxiality and consistency of the pressure relief action.

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