A low-pressure, high-flow air pump

Abstract

The present invention relates to a low-pressure, high-flow air pump, comprising an outer shell, an inner cylinder and a piston, wherein the inner cylinder is a hollow columnar structure, a left cover is provided on one side of the inner cylinder, and a right cover is provided on the other side, the piston is sleeved on the outer side of the inner cylinder and is located between the left cover and the right cover, the outer shell is sleeved on the outer side of the inner cylinder and the piston, and the outer surface of the piston and the outer surfaces of the left cover and the right cover are sealed, a transmission device for driving the piston to move back and forth between the left cover and the right cover is installed on one side of the inner cylinder, a hollow air passage connecting the end faces on both sides is opened inside the piston, and both ends of the hollow air passage are installed with a one-way valve, and a ventilation interface device is installed on the other side of the inner cylinder. This air pump is a reciprocating positive displacement pump, which adopts a reciprocating double-acting method to realize continuous operation, and can realize air extraction and compression back and forth, thereby providing a large flow rate.

Description

Technical Field

[0001] The invention relates to the technical field of air pumps, and in particular to a low-pressure and high-flow air pump. Background Art

[0002] Most of the large-volume inflatable cushions and airbags are not suitable for frequent inflation and deflation because the inflation volume is large and the inflation process is slow. The air pump that provides sufficient flow is either noisy or requires high power, resulting in high costs. In fact, the pressure required by these cushions is very low, but the flow rate required is relatively high, and the actual power required is not large. Therefore, in many occasions, people will use manual air pumps to solve the problem. The reduction in inflation speed has greatly reduced the performance of products such as air cushions. Summary of the invention

[0003] The object of the present invention is to provide a low-pressure, high-flow air pump to solve the problems encountered in the above-mentioned background technology.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A low-pressure, high-flow air pump comprises an outer shell, an inner cylinder and a piston, wherein the inner cylinder is a hollow columnar structure, a left cover is provided on one side of the inner cylinder, and a right cover is provided on the other side, the piston is sleeved on the outer side of the inner cylinder and is located between the left cover and the right cover, the outer shell is sleeved on the outer side of the inner cylinder and the piston to seal the outer surface of the piston and the outer surfaces of the left cover and the right cover, a transmission device for driving the piston to reciprocate between the left cover and the right cover is installed on one side of the interior of the inner cylinder, a hollow air duct connecting the end surfaces on both sides is opened inside the piston, one-way valves are installed at both ends of the hollow air duct, and a ventilation interface device is installed on the other side of the interior of the inner cylinder.

[0006] In the above scheme, at least two hollow air ducts are provided and are located at the upper and lower parts of the piston, a left exhaust pipe is provided on the side of the upper hollow air duct close to the left cover, a right exhaust pipe is provided on the side of the upper hollow air duct close to the right cover, a left intake pipe is provided on the side of the lower hollow air duct close to the left cover, and a right intake pipe is provided on the side of the lower hollow air duct close to the right cover, and the one-way valves are respectively installed inside the left exhaust pipe, the right exhaust pipe, the left intake pipe, and the right intake pipe.

[0007] In the above scheme, a groove is opened inside the piston, and a slide plate is fixed inside the groove; a motor is installed inside the inner cylinder, and the output shaft of the motor is connected to the transmission device; the output end of the transmission device drives the piston to reciprocate between the left cover and the right cover through the slide plate.

[0008] In the above scheme, the transmission device includes a worm gear mechanism, a gear, a driving wheel and a driven wheel. The worm in the worm gear mechanism is connected to the output shaft of the motor, and the turbine in the worm gear mechanism is meshed with the large gear through the connected small gear. The axis of the gear is fixedly connected to the axis of the driving wheel through a rotating shaft. The driving wheel and the driven wheel are installed on the outside of the inner cylinder and are located on the central axis of the groove. The driving wheel is connected to the driven wheel through a transmission belt. A cylinder is provided on the outside of the transmission belt. A vertical slide groove is opened inside the slide plate, and the body of the cylinder is located in the slide groove.

[0009] In the above scheme, the transmission belt is any one of a chain and a synchronous toothed belt, and the driving wheel and the driven wheel cooperate with the transmission belt for transmission.

[0010] In the above solution, the piston is made of lightweight material.

[0011] In the above solution, the piston is made of one-piece foam.

[0012] In the above solution, sealing grooves are respectively provided on the inner side and the outer side of the piston, and sealing rings are installed in the sealing grooves.

[0013] In the above scheme, the ventilation interface device includes an air inlet and an air outlet isolated from each other, the air inlet is connected to the ventilation pipe of the upper hollow air duct through a pipe, and the air outlet is connected to the ventilation pipe of the lower hollow air duct through a pipe.

[0014] In the above solution, one-way valves are respectively installed inside the air inlet and the air outlet.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The motor fixed in the inner cylinder by the bracket drives the driving wheel on the left side through the worm gear mechanism and a pair of gear reduction. The driving wheel drives the transmission belt matched with it to circulate. The raised cylinder on the transmission belt is stuck in the slide groove of the driving slide, thereby driving the fixedly connected foam piston to move left and right. This air pump is a reciprocating positive displacement pump, which uses reciprocating double-acting to achieve continuous operation. It can achieve air extraction and compression back and forth. That is, the piston is used for air compression and is also a channel for high and low pressure conversion and air flow. Therefore, it can provide a large flow rate to meet the current use of air bags or air cushions.

[0017] 2. The use of finished parts for the transmission device and customized foam parts for the piston can greatly reduce costs and reduce sealing requirements; the use of long-sized pistons and the formation of hollow air passages on the pistons, combined with the ventilation interface device, can achieve the dual effects of exhaust and compression in the simplest way; the installation position of the motor and the transmission device is set inside the central axis of the piston to improve the problem of low space utilization caused by the long piston, and the small-diameter circular drive is converted into a large-stroke reciprocating motion through a transmission belt, further improving the space utilization and reducing the noise during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall external structure of the present invention;

[0019] Figure 2 It is a schematic diagram of a half-section structure along the central axis of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the present invention without the outer shell;

[0021] Figure 4 for Figure 3 Schematic diagram of half-section structure along the central axis;

[0022] Figure 5 It is a structural schematic diagram of the present invention when the piston moves to the right;

[0023] Figure 6 It is a partial structural schematic diagram of the transmission device inside the inner cylinder of the present invention;

[0024] Figure 7 It is a partial structural schematic diagram of the transmission device outside the inner cylinder in the present invention;

[0025] Numbers in the figure: 1-housing; 11-support seat; 12-fixed cover; 2-inner cylinder; 21-left cover; 22-right cover; 23-motor; 24-transmission device; 241-worm gear mechanism; 242-large gear; 243-driving wheel; 244-driven wheel; 245-transmission belt; 246-cylinder; 247-small gear; 25-ventilation interface device; 251-air inlet; 252-air outlet; 26-control board; 3-piston; 31-left exhaust pipe; 32-right exhaust pipe; 33-left intake pipe; 34-right intake pipe; 35-one-way valve; 36-hollow air duct; 37-slide plate; 371-slide groove; 38-groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 and Figure 2As shown, a low-pressure, high-flow air pump comprises an outer shell 1, an inner cylinder 2 and a piston 3. The inner cylinder 2 is a hollow cylindrical structure, with a left cover 21 on one side of the inner cylinder 2 and a right cover 22 on the other side. The piston 3 is sleeved on the outer side of the inner cylinder 2 and is located between the left cover 21 and the right cover 22. When the air pump is set in the present embodiment to be placed vertically, a support seat 11 is installed at the bottom of the outer shell 1, and a fixed cover 12 fixed to the internal right cover 22 is installed at the top. When the air pump is set in the present embodiment to be placed horizontally, soft foot pads are installed on both sides of the outer shell 1 to support the entire air pump.

[0028] The piston 3 is made of a lightweight material. The piston 3 can be made of an integrated foam. The foam part is used as the piston 3, which has a small deadweight and can work better with other parts. The main body of the piston 3 can be made of thin-walled parts spliced ​​together, or it can be integrally formed. The lightweight material of the integral molding can be a foam material. The shape of the integral molding is more regular, and the contact surface of the two parts forming the gap has a longer length, thereby reducing the leakage between the high and low pressure areas.

[0029] The outer shell 1 is sleeved on the outer side of the inner cylinder 2 and the piston 3, and seals the outer surface of the piston 3 and the outer surfaces of the left cover 21 and the right cover 22. The main body of the piston 3 is a hollow cylinder, and the hollow part is also cylindrical. The hollow cylinder is sleeved on the thin-walled tube of the inner cylinder 2, and the outer edge surface is inside the thin-walled tube of the outer shell 1 outside. There is a small gap between the inner and outer tubes. When the piston 3 reciprocates, it slides with the outer and inner tubes. Due to the small gap, the high-pressure area and the low-pressure area formed are separated by a relatively far and narrow gap.

[0030] As a preferred solution, sealing grooves are respectively provided on the inner and outer sides of the piston 3, and sealing rings are installed in the sealing grooves. There are sealing rings between the piston 3 and the thin walls between the outer shell 1 and the inner tube 2, thereby completely isolating the high-pressure area from the low-pressure area and achieving a better sealing effect.

[0031] See also Figures 3 to 5 The piston 3 has a groove 38 in the form of a long waist hole. A slide plate 37 is fixed in the groove 38. The middle of the groove 38 can be slotted in the upper and lower parts, and then the slide plate 37 can be fixed in the upper and lower slots by screws. A sprocket chain or a pulley belt for transmission can be arranged in the groove 38 without exceeding the outer cylindrical surface, so that the entire piston 3 can reciprocate in the external pipe.

[0032] A transmission device 24 is installed on one side of the inner cylinder 2 to drive the piston 3 to reciprocate between the left cover 21 and the right cover 22. A motor 23 is installed inside the inner cylinder 2, and the output shaft of the motor 23 is in driving connection with the transmission device 24. The output end of the transmission device 24 drives the piston 3 to reciprocate between the left cover 21 and the right cover 22 through the slide plate 37.

[0033] See also Figure 6 and Figure 7 The transmission device 24 includes a worm gear mechanism 241, a gear 242, a driving wheel 243 and a driven wheel 244. The worm in the worm gear mechanism 241 is connected to the output shaft of the motor 23, the turbine in the worm gear mechanism 241 is meshed with the large gear 242 through the connected small gear 247, the axis of the gear 242 is fixedly connected to the axis of the driving wheel 243 through the rotating shaft, the driving wheel 243 and the driven wheel 244 are installed on the outside of the inner cylinder 2 and are located on the central axis of the groove 38, the driving wheel 243 is connected to the driven wheel 244 through the transmission belt 245, the outer side of the transmission belt 245 is provided with a cylinder 246, the inside of the slide plate 37 is provided with a vertical slide groove 371, and the body of the cylinder 246 is located in the slide groove 371.

[0034] There are two transmission devices 24, which are located on both sides of the inner tube 2. There are also two grooves 38 on both sides of the inside of the piston 3. A cylinder 246 is installed on the transmission belt 245. When moving, the cylinder 246 is stuck in the slide groove 371 in the middle of the slide plates 37 on both sides of the piston, so that the piston 3 can reciprocate left and right, but the cylinder 246 cannot rotate in the slide groove 371, so that the upper and lower airways can move in a straight line, and can always pass through the opening of the central pipe, and finally move to the ventilation position of the ventilation interface device 25.

[0035] In the transmission device 24, the worm gear mechanism 241 drives the driving wheel 243 and the driven wheel 244 to move, thereby driving the transmission belt 245 to move, and the force is transmitted to the piston 3 through the cylinder 246 structure, and finally the piston 3 is driven to reciprocate. The overall structure has a high space utilization rate.

[0036] As a preferred solution, the transmission belt 245 is any one of a chain and a synchronous toothed belt, and the driving wheel 243 and the driven wheel 244 cooperate with the transmission belt 245 for transmission. The transmission belt 245 composed of a chain or a synchronous belt drives the piston 3 to achieve a relatively low speed reciprocating motion, and with a larger cross-section and stroke, it satisfies the requirements of low noise, low pressure, and large flow of air compression or exhaust.

[0037] See also Figures 3 to 5The piston 3 has a hollow air passage 36 connected to the end surfaces on both sides, and both ends of the hollow air passage 36 are provided with a one-way valve 35. Specifically, at least two hollow air passages 36 are provided and are located at the upper and lower parts of the piston 3. The upper hollow air passage 36 is provided with a left exhaust pipe 31 on the side close to the left cover 21, the upper hollow air passage 36 is provided with a right exhaust pipe 32 on the side close to the right cover 22, the lower hollow air passage 36 is provided with a left intake pipe 33 on the side close to the left cover 21, and the lower hollow air passage 36 is provided with a right intake pipe 34 on the side close to the right cover 22. The one-way valves 35 are respectively installed inside the left exhaust pipe 31, the right exhaust pipe 32, the left intake pipe 33, and the right intake pipe 34.

[0038] There are multiple air valve structures on the piston 3, and each end face has at least two one-way valves 35 with opposite action directions, which allow air to enter and exhaust respectively, so that no matter which direction the piston 3 moves, one of the spaces at both ends of the piston 3 is compressed and the other is expanded. On the compressed side, the gas is compressed and discharged through the one-way valve 35 and the hollow air passages 36 on the upper and lower sides of the piston 3, and finally through the ventilation interface device 25. At the same time, the space on the other side of the piston 3, which is expanding in volume, also finally inhales air from the outside through the one-way valve 35, the hollow air passages 36 on the upper and lower sides of the piston 3, and the ventilation interface device 25.

[0039] A ventilation interface device 25 is installed on the other side of the inner tube 2 to compress and discharge the gas. The ventilation interface device 25 includes an air inlet 251 and an air outlet 252 which are isolated from each other. The air inlet 251 is connected to the ventilation pipe of the upper hollow air duct 36 through a pipeline, and the air outlet 252 is connected to the ventilation pipe of the lower hollow air duct 36 through a pipeline.

[0040] As a preferred solution, one-way valves 35 are installed inside the air inlet 251 and the air outlet 252 respectively, which cut off the connection with the outside when the pump is not working, so as to avoid the pressure change of the external load caused by the internal leakage.

[0041] In the present invention, the motor 23 fixed in the inner cylinder 2 by a bracket drives the driving wheel 243 on the left side after being reduced by a worm gear mechanism 241 and a pair of gears. The driving wheel 243 drives the transmission belt 245 matched therewith to circulate. The raised cylinder 246 on the transmission belt 245 is stuck in the slide groove 271 of the driving slide plate 27, thereby driving the fixedly connected piston 3 made of foam to move left and right.

[0042] When the piston 3 does not move, the upper exhaust pipe (left exhaust pipe 31 and right exhaust pipe 32) and the lower intake pipe (left intake pipe 33 and right intake pipe 34) are closed by virtue of elasticity or an external spring. The high-pressure area and the low-pressure area have a small gap and a long distance with the inner pipe of the outer shell 1 and the outer pipe of the inner tube 2 because the piston 3 has a certain elasticity, and the leakage is slow.

[0043] See also Figure 4 When the piston 3 moves to the right, the space on the right side shrinks and the pressure increases. When it increases to a certain level, the exhaust pipe on the right side is opened, and the air enters the hollow air channel 36 of the left exhaust pipe 31. The oblong air channel always covers the ventilation holes on the upper part of the inner circular pipe. Therefore, the compressed air passes through the ventilation holes and the ventilation interface device 25, and is finally discharged through the air inlet 251.

[0044] See also Figure 5 When the piston 3 reaches the rightmost side and starts to return, the space increases, the air pressure decreases, and the exhaust valve closes. When the pressure drops further, the right air intake valve 34 on the lower side opens, and the external air passes through the air outlet 252 and the hole on the air exchange interface device 25, and further enters the hollow air channel 36 on the lower side through the air exchange holes on the fully covered inner pipe, and finally enters the space on the right side of the piston 3 through the one-way valve 35 to complete the air intake.

[0045] When the piston 3 moves to the right, the space on the right side decreases, but the space on the left side expands, the air on the right side is compressed and sent to the air inlet, while the space on the left side expands, and through the same process, the air is sucked in from the air outlet 252. When the piston 3 moves to the left, the space on the left side decreases, and the air is sent to the air inlet 251 through the left exhaust pipe 31 on the left side, while the space on the right side expands, and the air is sucked in through the air outlet 252, so no matter which direction the piston 3 moves, the air is compressed and extracted at the same time, thereby providing a continuous effect.

[0046] The air pump is a reciprocating positive displacement pump, which realizes continuous operation by a reciprocating double-acting mode, and can realize both exhaust and compression in both directions, that is, the piston 3 is used for air compression and is also a channel for high-low pressure conversion and air flow, and can thus provide a larger flow rate; the transmission device 24 uses finished parts and the piston 3 uses customized foam parts, which can greatly reduce costs and reduce sealing requirements; a long-sized piston 3 is used and a hollow air channel 36 is formed on the piston 3, and combined with a ventilation interface device 25, the dual effects of exhaust and compression are realized in the simplest way; the installation position of the motor 23 and the transmission device 24 is set inside the central axis of the piston 3, so as to improve the problem of low space utilization caused by the long length of the piston 3, and the small-diameter circular drive is converted into a large-stroke reciprocating motion through the transmission belt 245, so as to further improve the space utilization and reduce the noise during operation.

[0047] When the piston 3 has a diameter of 130 mm and a length of 600 mm, the air pump can provide a flow rate of more than 500 L per minute and a low pressure of 5 KPa-20 KPa under low noise conditions, and will not damage the airbag or air cushion even under extreme conditions.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-pressure, high-flow air pump, characterized in that: The invention comprises an outer shell (1), an inner cylinder (2) and a piston (3); the inner cylinder (2) is a hollow columnar structure; a left cover (21) is provided on one side of the inner cylinder (2) and a right cover (22) is provided on the other side; the piston (3) is sleeved on the outer side of the inner cylinder (2) and is located between the left cover (21) and the right cover (22); the outer shell (1) is sleeved on the outer side of the inner cylinder (2) and the piston (3), and the outer surface of the piston (3) and the left cover (21) are sealed. 21) is sealed with the outer surface of the right cover (22), a transmission device (24) is installed on one side of the interior of the inner tube (2) for driving the piston (3) to reciprocate between the left cover (21) and the right cover (22), a hollow air duct (36) connecting the end surfaces on both sides is opened inside the piston (3), and both ends of the hollow air duct (36) are installed with a one-way valve (35), and a ventilation interface device (25) is installed on the other side of the interior of the inner tube (2).

2. A low-pressure, high-flow air pump according to claim 1, characterized in that: At least two hollow air passages (36) are provided and are located at the upper and lower parts of the piston (3); a left exhaust pipe (31) is provided on the side of the upper hollow air passage (36) close to the left cover (21); a right exhaust pipe (32) is provided on the side of the upper hollow air passage (36) close to the right cover (22); a left intake pipe (33) is provided on the side of the lower hollow air passage (36) close to the left cover (21); a right intake pipe (34) is provided on the side of the lower hollow air passage (36) close to the right cover (22); and the one-way valve (35) is respectively installed inside the left exhaust pipe (31), the right exhaust pipe (32), the left intake pipe (33), and the right intake pipe (34).

3. A low-pressure, high-flow air pump according to claim 1, characterized in that: The piston (3) is provided with a groove (38) inside which a slide plate (37) is fixedly mounted; a motor (23) is installed inside the inner cylinder (2), and an output shaft of the motor (23) is connected to a transmission device (24); the output end of the transmission device (24) drives the piston (3) to reciprocate between the left cover (21) and the right cover (22) via the slide plate (37).

4. A low-pressure, high-flow air pump according to claim 3, characterized in that: The transmission device (24) comprises a worm gear mechanism (241), a gear (242), a driving wheel (243) and a driven wheel (244); the worm in the worm gear mechanism (241) is drivingly connected to the output shaft of the motor (23); the turbine in the worm gear mechanism (241) is meshingly connected to the large gear (242) via a connected small gear (247); the axis of the gear (242) is fixedly connected to the axis of the driving wheel (243) via a rotating shaft. The driving wheel (243) and the driven wheel (244) are fixedly connected, the driving wheel (243) and the driven wheel (244) are installed on the outside of the inner cylinder (2) and are located on the central axis of the groove (38), the driving wheel (243) is connected to the driven wheel (244) through a transmission belt (245), a cylinder (246) is provided on the outside of the transmission belt (245), a vertical slide groove (371) is opened inside the slide plate (37), and the body of the cylinder (246) is located in the slide groove (371).

5. A low-pressure, high-flow air pump according to claim 4, characterized in that: The transmission belt (245) is any one of a chain and a synchronous toothed belt, and the driving wheel (243) and the driven wheel (244) cooperate with the transmission belt (245) for transmission.

6. A low-pressure, high-flow air pump according to claim 1, characterized in that: The piston (3) is made of lightweight material.

7. A low-pressure, high-flow air pump according to claim 6, characterized in that: The piston (3) is made of one-piece foam.

8. A low-pressure, high-flow air pump according to claim 1, characterized in that: The inner side and the outer side of the piston (3) are respectively provided with sealing grooves, and sealing rings are installed in the sealing grooves.

9. A low-pressure, high-flow air pump according to claim 1, characterized in that: The ventilation interface device (25) comprises an air inlet (251) and an air outlet (252) which are isolated from each other; the air inlet (251) is connected to the ventilation pipe of the upper hollow air duct (36) through a pipe, and the air outlet (252) is connected to the ventilation pipe of the lower hollow air duct (36) through a pipe.

10. A low-pressure, high-flow air pump according to claim 9, characterized in that: One-way valves (35) are respectively installed inside the air inlet (251) and the air outlet (252).

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