Air pump

Abstract

The utility model discloses an air pump and relates to the technical field of air pumps, the air pump is used for inflating and deflating an air bag, the air pump comprises a pump body, a shell and an electromagnetic valve, the electromagnetic valve is arranged in a containing cavity, an inflating port is used for being communicated with the air bag, an exhaust port is communicated with the outside through the containing cavity, and a valve element assembly can open or close the exhaust port. Therefore, the air pump has an inflation state and an exhaust state. According to the technical scheme, the electromagnetic valve is arranged in the containing cavity of the shell, the valve element assembly of the electromagnetic valve can open or close the exhaust port, the air pump has the inflation state and the exhaust state, and therefore the air bag can be inflated and exhausted through the air pump; and the exhaust port is communicated with the containing cavity, so that when the air pump exhausts the air bag, air in the air bag firstly enters the containing cavity with the large volume from the exhaust port, is buffered by the containing cavity and then is exhausted into the atmosphere, and therefore the stability of the air pump when the air bag is exhausted is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pumps, and particularly relates to an air pump. Background Art

[0002] As an auxiliary support device, a pneumatic lumbar support plays an important role in improving sitting posture, preventing and relieving lumbar pain. Traditional pneumatic lumbar supports mainly consist of an airbag, an air pump, and a solenoid valve. The solenoid valve controls the air pump to inflate the airbag or exhaust the airbag to adjust the support strength to meet different user needs or relieve lumbar pressure.

[0003] When the traditional pneumatic lumbar support exhausts air, the gas in the airbag directly discharges from the exhaust port into the atmosphere. The exhaust speed is often sudden and rapid, the gas flow rate is large and unstable, resulting in large pressure fluctuations, easy to generate impact sounds or discomfort, and even causing harm to surrounding items and operators. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose an air pump, aiming to improve the stability of the air pump when exhausting air from the airbag.

[0005] To achieve the above purpose, the air pump proposed by the utility model is used for inflating and exhausting the airbag, and the air pump includes:

[0006] A pump body having an exhaust cavity and an exhaust hole communicating with the exhaust cavity;

[0007] A housing provided at one end of the pump body and forming a receiving cavity with the pump body;

[0008] A solenoid valve provided in the receiving cavity. The solenoid valve includes a valve body and a valve core assembly. The valve body has an inner cavity communicating with the exhaust hole, an inflation port and an exhaust port communicating with the inner cavity. The inflation port is used to communicate with the airbag, and the exhaust port communicates with the outside through the receiving cavity;

[0009] The valve core assembly penetrates through the inner cavity and can open or close the exhaust port, so that the air pump has an inflation state and an exhaust state. In the inflation state, the valve core assembly closes the exhaust port, so that the gas in the exhaust cavity discharges from the inflation port to the airbag; in the exhaust state, the valve core assembly opens the exhaust port, so that the gas in the airbag enters from the inflation port and discharges from the exhaust port.

[0010] In an embodiment, the air pump further includes a control board provided in the receiving cavity and separating the receiving cavity into a communicating installation cavity and a buffer cavity. The solenoid valve is provided in the installation cavity, and the housing is provided with an air outlet communicating with the buffer cavity.

[0011] In one embodiment, one of the control board and the valve body is provided with a limiting shaft, and the other is provided with a limiting hole for the limiting shaft to pass through.

[0012] In one embodiment, the air pump further includes a pressure regulating valve, which is arranged in the buffer cavity and communicated with the exhaust cavity, and the pressure regulating valve is used to regulate the air pressure in the exhaust cavity.

[0013] In one embodiment, the pump body includes a motor assembly and a compression assembly having a plurality of compression chambers. The motor assembly is arranged at one end of the compression assembly away from the housing, and the motor assembly is used to drive the compression chambers to compress gas; the exhaust cavity includes a central chamber and a plurality of exhaust chambers communicated with the central chamber, and the plurality of exhaust chambers are communicated with the compression chambers in a one-to-one correspondence. The solenoid valve and the pressure regulating valve are respectively communicated with one of the exhaust chambers.

[0014] In one embodiment, there are two solenoid valves, and the two solenoid valves are arranged side by side in the installation cavity and are respectively communicated with the two exhaust chambers in a one-to-one correspondence.

[0015] In one embodiment, the spool assembly includes a first spool, a second spool and an elastic member. The first spool is disposed at one end of the inner cavity close to the exhaust hole and forms an air inlet passage communicating the exhaust hole and the inner cavity. The second spool is disposed between the exhaust port and the first spool and has a gap with the inner peripheral wall of the inner cavity. The second spool can approach or move away from the first spool to open or close the exhaust port. The elastic member is disposed in the air inlet passage, with one end abutted against the inner wall of the air inlet passage and the other end abutted against the second spool.

[0016] In one embodiment, at least a part of one side surface of the second spool close to the first spool is provided with a first sealing member, and the first sealing member abuts against the elastic member and can block the air inlet passage in the exhaust state.

[0017] In one embodiment, at least a part of one side surface of the second spool close to the exhaust port is provided with a second sealing member, and in the inflation state, the second sealing member blocks the exhaust port.

[0018] In one embodiment, a guiding rib is provided on the inner wall surface of the inner cavity corresponding to the second spool, and the guiding rib extends along the moving direction of the second spool.

[0019] In one embodiment, a first clamping groove is formed on the outer wall of one end of the first valve core protruding out of the inner cavity, and a second clamping groove is formed on the outer wall of one end of the valve body away from the first clamping groove; the solenoid valve further includes a fixing bracket arranged on the outer periphery of the valve body, and opposite ends of the fixing bracket are correspondingly arranged in the first clamping groove and the second clamping groove.

[0020] The technical solution of the present utility model is to arrange a solenoid valve in the accommodation cavity of the housing. The valve core assembly of the solenoid valve can open or close the exhaust port, so that the air pump has an inflation state and an exhaust state, thereby realizing the inflation and exhaust of the air pump to the airbag, and integrating the air pump and the solenoid valve into one body, solving the problems of large occupied space, easy gas leakage, detachment and other defects caused by the independent existence of the air pump and the solenoid valve; also by connecting the exhaust port with the accommodation cavity, when the air pump exhausts the airbag, the gas in the airbag first enters the relatively large-volume accommodation cavity from the exhaust port, and then is discharged to the atmosphere after being buffered by the accommodation cavity, thereby improving the stability of the air pump when exhausting the airbag and avoiding discomfort or noise interference to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a sectional view along the axial direction of an embodiment of the air pump provided by the present utility model;

[0023] Figure 2 For Figure 1 the sectional view of the housing and its internal structure and the exhaust cavity in

[0024] Figure 3 For Figure 1 the sectional view of the solenoid valve and the control board in

[0025] Figure 4 It is a top view of an embodiment of the air pump provided by the present utility model;

[0026] Figure 5 It is a sectional view along the horizontal line of an embodiment of the exhaust cavity provided by the present utility model;

[0027] Figure 6 For Figure 1 the sectional view of the housing and the valve body in

[0028] Explanation of the reference numerals in the drawings:

[0029] 10. Air pump; 100. Pump body; 200. Housing; 300. Solenoid valve; 400. Control board; 500. Limit shaft; 600. Pressure regulating valve; 110. Exhaust cavity; 111. Exhaust chamber; 112. Central chamber; 120. Exhaust hole; 130. Compression chamber; 140. Motor assembly; 210. Accommodating cavity; 211. Installation cavity; 212. Buffer cavity; 213. Air outlet; 214. Limit rib; 310. Valve body; 311. Inner cavity; 312. Inflation port; 313. Exhaust port; 314. Guide rib; 315. Second card slot; 320. Spool assembly; 321. First spool; 322. Second spool; 323. Elastic member; 324. Intake passage; 325. First seal; 326. Second seal; 327. First card slot; 330. Fixed bracket.

[0030] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] The present utility model proposes an air pump 10.

[0035] Please refer to Figure 1 , in an embodiment of the present utility model, the air pump 10 is used to inflate and deflate an airbag. The air pump 10 includes a pump body 100, a housing 200, and a solenoid valve 300. The pump body 100 has an exhaust chamber 110 and an exhaust hole 120 communicating with the exhaust chamber 110; the housing 200 is provided at one end of the pump body 100 and forms a receiving chamber 210 with the pump body 100; the solenoid valve 300 is provided in the receiving chamber 210. The solenoid valve 300 includes a valve body 310 and a spool assembly 320. The valve body 310 has an inner cavity 311 communicating with the exhaust hole 120, and an inflation port 312 and an exhaust port 313 communicating with the inner cavity 311. The inflation port 312 is used to communicate with the airbag, and the exhaust port 313 communicates with the outside through the receiving chamber 210; the spool assembly 320 is disposed through the inner cavity 311 and can open or close the exhaust port 313, so that the air pump 10 has an inflation state and an exhaust state. In the inflation state, the spool assembly 320 closes the exhaust port 313 so that the gas in the exhaust chamber 110 is discharged from the inflation port 312 to the airbag; in the exhaust state, the spool assembly 320 opens the exhaust port 313 so that the gas in the airbag enters from the inflation port 312 and is discharged from the exhaust port 313.

[0036] Specifically, the pump body 100 includes an exhaust chamber 110 and an exhaust hole 120 connected thereto. The high-pressure gas generated by compression of the pump body 100 is collected in the exhaust chamber 110 for supplying gas to the airbag. The housing 200 is installed at one end of the pump body 100 and forms a receiving chamber 210 together with the pump body 100. A buckle is provided at the edge of the outer surface of the pump body 100, and the housing 200 is provided with a connection hole corresponding to the buckle. The buckle is buckled in the connection hole, so that the housing 200 and the pump body 100 are detachably connected. The solenoid valve 300 is located in the receiving chamber 210 and is responsible for controlling the direction of the air flow to realize the control of inflating and deflating the airbag. The solenoid valve 300 mainly includes a valve body 310 and a spool assembly 320. The valve body 310 has an inner cavity 311 connected to the exhaust hole 120 of the pump body 100, so that the high-pressure gas in the exhaust chamber 110 can enter the inner cavity 311 through the exhaust hole 120. The valve body 310 also has an inflation port 312 and an exhaust port 313 connected to the inner cavity 311. The inflation port 312 is used to fill the high-pressure gas generated by the pump body 100 into the airbag, and the exhaust port 313 is used to discharge the gas in the airbag to the atmosphere. The spool assembly 320 is located in the inner cavity 311 of the valve body 310 and can be moved to open or close the exhaust port 313, so that the air pump 10 has an inflation state in which the gas in the exhaust chamber 110 is discharged from the inflation port 312 to the airbag, and an exhaust state in which the gas in the airbag enters from the inflation port 312 and is discharged from the exhaust port 313.

[0037] When the air pump 10 is in the inflation state, the valve core assembly 320 closes the exhaust port 313, and the gas in the pump body 100 flows from the exhaust cavity 110 through the exhaust hole 120, passes through the inner cavity 311 of the valve body 310, and then is discharged from the inflation port 312 to the airbag, realizing the inflation of the airbag. When the air pump 10 is in the exhaust state, the valve core assembly 320 opens the exhaust port 313, and the gas in the airbag enters the inner cavity 311 of the valve body 310 through the inflation port 312, and is first discharged from the exhaust port 313 to the accommodation cavity 210, and then discharged to the outside, realizing the exhaust of the airbag.

[0038] The air pump 10 controls the direction of the air flow through the switch of the solenoid valve 300 to realize the inflation and exhaust of the airbag. In the inflation state, the solenoid valve 300 closes the exhaust port 313 and allows the gas to flow from the pump body 100 to the airbag; in the exhaust state, the solenoid valve 300 opens the exhaust port 313 and allows the gas in the airbag to enter through the inflation port 312 and be first discharged from the exhaust port 313 to the accommodation cavity 210, and then discharged to the outside.

[0039] In the exhaust state, since the exhaust port 313 is communicated with the accommodation cavity 210, the gas is first discharged to the accommodation cavity 210 and then discharged from the accommodation cavity 210 to the atmosphere, rather than directly discharged from the exhaust port 313 to the atmosphere. Therefore, the accommodation cavity 210 plays a buffering role. Specifically, initially, the pressure inside the airbag is higher than the external atmospheric pressure. When the gas starts to flow out of the airbag, the pressure inside the airbag begins to decrease. When the gas passes through the inner cavity 311 and the exhaust port 313 of the solenoid valve 300, due to the relatively narrow flow path, the local pressure increases slightly. The pressure of the gas passing through the exhaust port 313 is relatively large and the flow rate is relatively fast. Once the gas enters the accommodation cavity 210 through the exhaust port 313, due to the relatively large space of the accommodation cavity 210, the pressure of the gas will rapidly decrease to approach the external atmospheric pressure, so that the flow rate of the gas in the accommodation cavity 210 slows down, and then the flow rate of the gas discharged to the atmosphere also slows down and the flow is stable. When the airbag exhausts, its gas is first discharged to the larger-volume accommodation cavity 210 and then discharged from the accommodation cavity 210 to the atmosphere, so that the accommodation cavity 210 can help smooth the gas flow, improve the stability of the air pump 10 when exhausting the airbag, and avoid the impact sound or discomfort that may occur during rapid exhaust; it can also reduce the exhaust speed and reduce the generation of noise; it can also make the exhaust process more gradual and stable, prevent the pressure mutation caused by sudden exhaust, avoid the harm of high-pressure gas to surrounding items and operators, and improve the safety of the air pump 10 during exhaust.

[0040] The technical solution of the present utility model is to provide a solenoid valve 300 in the accommodation cavity 210 of the housing 200. The valve core assembly 320 of the solenoid valve 300 can open or close the exhaust port 313, enabling the air pump 10 to have an inflation state and an exhaust state, thereby realizing the inflation and exhaust of the air pump 10 to the airbag. The air pump 10 and the solenoid valve 300 are integrated into one, solving the problems of large occupied space, easy gas leakage and detachment of the air path pipeline, etc. caused by the independent existence of the air pump 10 and the solenoid valve 300. By connecting the exhaust port 313 with the accommodation cavity 210, when the air pump 10 exhausts the airbag, the gas in the airbag first enters the accommodation cavity 210 with a larger volume through the exhaust port 313, and then is discharged into the atmosphere after being buffered by the accommodation cavity 210, thereby improving the stability of the air pump 10 when exhausting the airbag and avoiding discomfort or noise interference to the user.

[0041] In an embodiment, please refer to Figures 2 to 4 , the air pump 10 further includes a control board 400. The control board 400 is disposed in the accommodation cavity 210 and divides the accommodation cavity 210 into a communicating installation cavity 211 and a buffer cavity 212. The solenoid valve 300 is disposed in the installation cavity 211, and the housing 200 is provided with an air outlet 213 communicating with the buffer cavity 212.

[0042] The control board 400 is disposed in the accommodation cavity 210 and divides the accommodation cavity 210 into an installation cavity 211 and a buffer cavity 212. The control board 400 is used to control the on-off of the solenoid valve 300, thereby controlling the inflation and exhaust of the air pump 10 to the airbag. When the solenoid valve 300 is in the exhaust state, the valve core assembly 320 opens the exhaust port 313, and the gas in the airbag enters the inner cavity 311 of the valve body 310 through the inflation port 312 and is discharged to the buffer cavity 212 from the exhaust port 313, and then is discharged into the atmosphere through the air outlet 213. The existence of the buffer cavity 212 helps to smooth the gas flow and avoid the impact sound or discomfort that may occur during rapid exhaust; the buffer cavity 212 can reduce the exhaust speed and reduce the generation of noise; the buffer cavity 212 can make the exhaust process of the airbag more gradual and stable, improving the comfort of the user. The solenoid valve 300 and other components are placed in the installation cavity 211, and the exhausted gas is guided to the buffer cavity 212 to avoid the impact and damage of high-pressure gas on the solenoid valve 300 and other components. At the same time, the inflation port 312 corresponds to the installation cavity 211, which means that the airbag is closer to the installation cavity 211, and the gas finally is discharged into the atmosphere through the air outlet 213 from the buffer cavity 212, avoiding the influence of the discharged gas on the airbag and preventing the airbag from blocking the normal discharge of the gas in the buffer cavity 212.

[0043] In an embodiment, please refer to Figures 1 to 3 , one of the control board 400 and the valve body 310 is provided with a limiting shaft 500, and the other is provided with a limiting hole for the limiting shaft 500 to pass through.

[0044] The limit shaft 500 can be arranged on the control board 400 or the valve body 310, and is used to pass through a limit hole (not shown in the figure) on another component. The size and shape of the limit hole match those of the limit shaft 500 so that the limit shaft 500 can pass through smoothly. Through the limit cooperation between the limit shaft 500 and the limit hole, the relative position between the control board 400 and the valve body 310 can be fixed, ensuring the correct alignment between the control board 400 and the valve body 310, and avoiding the failure of the electrical connection between the control board 400 and the solenoid valve 300 caused by misalignment; it can improve the stability of the overall structure of the air pump 10 and prevent the control board 400 and the valve body 310 from shifting due to vibration or other external forces during use. The design of the limit shaft 500 and the limit hole can simplify the assembly process, making the assembly easier and faster. In order to improve the connection stability between the control board 400 and the valve body 310, a limit hole can be arranged at one end of the valve body 310 for the limit shaft 500 on the control board 400 to pass through, and a limit shaft 500 can be arranged at the other end of the valve body 310 to pass through the limit hole on the control board 400.

[0045] In one embodiment, please refer to Figure 6 , two limit ribs 214 extending along the edge of the control board 400 are respectively arranged on two opposite inner side walls of the housing 200, and the two limit ribs 214 form a limit groove, and the edge of the control board 400 is limited in the limit groove.

[0046] Two limit ribs 214 are arranged on one inner side wall of the accommodation cavity 210 corresponding to the edge of the control board 400, and a limit groove is formed between the two limit ribs 214, and one side edge of the control board 400 is inserted into this limit groove. Two limit ribs 214 are also arranged on the other opposite inner side wall of the accommodation cavity 210 corresponding to the other side edge of the control board 400, and a limit groove for inserting the edge of the control board 400 is also formed. The limit groove can limit the lateral movement of the control board 400 in the accommodation cavity 210, prevent the control board 400 from shifting due to vibration or other external forces during use, and improve the stability and reliability of the entire air pump 10.

[0047] In one embodiment, please refer to Figure 1 and Figure 2 , the air pump 10 further includes a pressure regulating valve 600, the pressure regulating valve 600 is arranged in the buffer cavity 212 and is communicated with the exhaust cavity 110, and the pressure regulating valve 600 is used to regulate the air pressure in the exhaust cavity 110.

[0048] The air pump 10 further includes a pressure regulating valve 600. The high-pressure gas generated by the compression of the pump body 100 is gathered in the exhaust cavity 110 and supplies gas to the airbag through the inflation port 312. The pressure regulating valve 600 is used to adjust the air pressure in the exhaust cavity 110. When the air pressure in the exhaust cavity 110 is greater than the maximum bearing pressure of the airbag, the pressure regulating valve 600 can release some of the gas in the exhaust cavity 110 into the buffer cavity 212, and then discharge it into the atmosphere through the air outlet 213 of the buffer cavity 212, so that the air pressure in the exhaust cavity 110 does not exceed the maximum bearing pressure of the airbag, to avoid over-inflating the airbag, thereby avoiding damage to the airbag caused by excessive air pressure of the air flow output by the air pump 10. It can be understood that when the pressure regulating valve 600 adjusts the air pressure in the exhaust cavity 110, the high-pressure gas in the exhaust cavity 110 first enters the buffer cavity 212 through the pressure regulating valve 600, and then is discharged into the atmosphere through the air outlet 213 after buffering, thereby improving the stability of the pressure regulating valve 600 when adjusting the air pressure for exhaust, and avoiding bringing discomfort or noise interference to the user. In addition, the pressure regulating valve 600 is arranged in the buffer cavity 212, and the gas discharged from the pressure regulating valve 600 can be directly discharged into the buffer cavity 212, avoiding the impact of high-pressure gas on other components; at the same time, it can also balance the weights on both sides of the installation cavity 211 and the buffer cavity 212.

[0049] In one embodiment, please refer to Figure 1 and Figure 5 , the pump body 100 includes a motor assembly 140 and a compression assembly having a plurality of compression chambers 130. The motor assembly 140 is arranged at one end of the compression assembly away from the housing 200, and the motor assembly 140 is used to drive the compression chambers 130 to compress gas; the exhaust cavity 110 includes a central chamber 112 and a plurality of exhaust chambers 111 communicated with the central chamber 112. The plurality of exhaust chambers 111 are communicated with the compression chambers 130 in one-to-one correspondence, and the solenoid valve 300 and the pressure regulating valve 600 are respectively communicated with one exhaust chamber 111.

[0050] The motor assembly 140 is used to provide a power source and drive the compression assembly through rotational or reciprocating motion. The motor assembly 140 can be an electric motor, a hydraulic motor, a pneumatic motor, etc. The compression assembly is located between the motor assembly 140 and the exhaust chamber 110. A plurality of compression chambers 130 compress gas through the drive of the motor assembly 140. The exhaust chamber 110 includes a central chamber 112 and a plurality of exhaust chambers 111. The plurality of exhaust chambers 111 are respectively communicated with the plurality of compression chambers 130 correspondingly to collect the compressed gas discharged from each compression chamber 130 and realize the communication between the respective exhaust chambers 111 through the central chamber 112. The solenoid valve 300 and the pressure regulating valve 600 are each communicated with an exhaust chamber 111, so that the compressed gas can inflate the airbag through the solenoid valve 300, and the air pressure of the exhaust chamber 110 can be regulated through the pressure regulating valve 600, and the solenoid valve 300 and the pressure regulating valve 600 can be reasonably distributed in space. Through continuous multi-stage compression, the gas compression efficiency can be improved to ensure that the air pressure in the exhaust chamber 110 can meet the air pressure requirements of the airbag.

[0051] In one embodiment, please refer to Figure 1 and Figure 4 , there are two solenoid valves 300. The two solenoid valves 300 are arranged side by side in the installation cavity 211 and are respectively communicated with the two exhaust chambers 111 correspondingly.

[0052] Setting two solenoid valves 300 can improve the reliability of the air pump 10. If one of the solenoid valves 300 has a problem, the other can still work normally; it can improve the flexibility of the air pump 10. By controlling the opening states of different solenoid valves 300, the exhaust speed and volume can be flexibly adjusted to achieve more precise pressure control; it can improve the working efficiency of the air pump 10. The two solenoid valves 300 can work simultaneously to speed up the inflation and exhaust processes and improve the overall efficiency of the system.

[0053] In one embodiment, please refer to Figure 3 , the spool assembly 320 includes a first spool 321, a second spool 322 and an elastic member 323. The first spool 321 penetrates through one end of the inner cavity 311 close to the exhaust hole 120 and forms an air inlet channel 324 communicating the exhaust hole 120 and the inner cavity 311. The second spool 322 is arranged between the exhaust port 313 and the first spool 321 and has a gap with the inner peripheral wall of the inner cavity 311. The second spool 322 can approach or move away from the first spool 321 to open or close the exhaust port 313. The elastic member 323 is arranged in the air inlet channel 324, with one end abutting against the inner wall of the air inlet channel 324 and the other end abutting against the second spool 322.

[0054] In the inflated state, the solenoid valve 300 is in the power-off state. The second valve core 322 is away from the first valve core 321 under the support of the elastic member 323. A gap is formed between one end of the second valve core 322 and the first valve core 321, enabling the high-pressure gas in the exhaust cavity 110 to flow into the inner cavity 311 through the intake passage 324 of the first valve core 321. The other end of the second valve core 322 abuts against the edge of the exhaust port 313 to close the exhaust port 313, so that the gas in the inner cavity 311 is discharged from the inflation port 312 to the airbag, thereby achieving the inflation of the airbag.

[0055] In the exhaust state, when exhaust is required, the solenoid valve 300 is in the powered-on state. The second valve core 322 approaches the first valve core 321 under the action of the control signal of the control board 400, thereby opening the exhaust port 313. The gas in the airbag enters the inner cavity 311 from the inflation port 312 and is discharged to the buffer cavity 212 through the opened exhaust port 313, and finally discharged to the atmosphere through the air outlet 213. At this time, the second valve core 322 compresses the elastic member 323 and blocks the intake passage 324 to block the intake passage 324 and the inner cavity 311, avoiding the gas entering the inner cavity 311 from the airbag from flowing back to the exhaust cavity 110. Of course, a check valve can also be provided at the exhaust hole 120 between the exhaust cavity 110 and the intake passage 324 to further prevent the gas in the inner cavity 311 from flowing back to the exhaust cavity 110.

[0056] When the exhaust is completed and the solenoid valve 300 is in the power-off state, the elastic member 323 pushes the second valve core 322 away from the first valve core 321 to close the exhaust port 313 and prevent gas flow. During the exhaust process, the elastic member 323 can help control the position of the second valve core 322, thereby controlling the opening degree of the exhaust port 313 and further controlling the exhaust speed.

[0057] In one embodiment, please refer to Figure 3 , at least part of one side of the second valve core 322 close to the first valve core 321 is provided with a first seal 325. The first seal 325 abuts against the elastic member 323 and can block the intake passage 324 in the exhaust state.

[0058] The function of the first seal 325 is to abut against the elastic member 323 and seal the intake passage 324 when the second valve core 322 approaches the first valve core 321, ensuring that gas does not flow back to the exhaust cavity 110 through the intake passage 324, improving the efficiency of the exhaust process. The first seal 325 is made of an elastic material such as rubber or silica gel, avoiding the hard contact between the second valve core 322 and the elastic member 323, and improving the reliability and service life of the solenoid valve 300.

[0059] In one embodiment, please refer to Figure 3, on one side of the second spool 322 close to the exhaust port 313, at least part of it is provided with a second seal 326, and in the inflation state, the second seal 326 blocks the exhaust port 313.

[0060] The function of the second seal 326 is to closely fit with the exhaust port 313 in the inflation state to block the exhaust port 313, improve the sealing effect of the exhaust port 313, ensure that gas does not leak from the exhaust port 313, so as to ensure that gas only enters the airbag through the inflation port 312, and improve the efficiency of the inflation process. The second seal 326 is made of elastic materials such as rubber and silica gel, avoiding the hard contact between the edge of the second spool 322 and the exhaust port 313, and improving the reliability and service life of the solenoid valve 300.

[0061] In one embodiment, please refer to Figure 3 and Figure 6 , on the inner wall surface of the inner cavity 311 corresponding to the second spool 322, there is a guiding rib 314, and the guiding rib 314 extends along the moving direction of the second spool 322.

[0062] The function of the guiding rib 314 is to guide the movement of the second spool 322, which helps to ensure that it maintains the correct direction and position during the movement, so that the second spool 322 can smoothly approach or move away from the first spool 321; it helps to improve the stability of the movement of the second spool 322, reduce shaking and deviation; it helps to reduce the friction between the second spool 322 and the inner wall of the inner cavity 311, thereby reducing wear; it helps to maintain a spacing between the second spool 322 and the inner peripheral wall of the inner cavity 311, ensuring that the gas in the intake passage 324 can flow through this gap to the inflation port 312 to achieve inflation of the airbag.

[0063] In one embodiment, please refer to Figure 3 and Figure 6 , on the outer wall of the end of the first spool 321 extending out of the inner cavity 311, a first clamping groove 327 is formed, and on the outer wall of the end of the valve body 310 far from the first clamping groove 327, a second clamping groove 315 is formed; the solenoid valve 300 further includes a fixing bracket 330 provided on the outer periphery of the valve body 310, and the opposite ends of the fixing bracket 330 are correspondingly arranged in the first clamping groove 327 and the second clamping groove 315.

[0064] The fixing bracket 330 is used to fix the first spool 321, so that the first spool 321 can stably pass through the inner cavity 311 of the valve body 310, realizing the relative position fixation between the valve body 310 and the first spool 321, so as to improve the stability of the overall structure of the solenoid valve 300 and prevent component displacement caused by vibration or other external forces during use. The fixing bracket 330 includes two annular or arc-shaped clamping plates and a connecting plate connecting the two clamping plates. The two clamping plates are respectively inserted into the first clamping groove 327 and the second clamping groove 315 to ensure the correct alignment between the fixing bracket 330, the valve body 310 and the first spool 321, and limit the relative movement between the first spool 321 and the valve body 310, improving the stability and reliability of the entire solenoid valve 300.

[0065] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An air pump, characterized in that, For inflating and exhausting the airbag, the air pump includes: A pump body having an exhaust chamber and an exhaust hole communicating with the exhaust chamber; A housing provided at one end of the pump body and forming a receiving chamber with the pump body; A solenoid valve provided in the receiving chamber. The solenoid valve includes a valve body and a spool assembly. The valve body has an inner cavity communicating with the exhaust hole, an inflation port and an exhaust port communicating with the inner cavity. The inflation port is used to communicate with the airbag, and the exhaust port communicates with the outside through the receiving chamber; The spool assembly is disposed through the inner cavity and can open or close the exhaust port, so that the air pump has an inflation state and an exhaust state. In the inflation state, the spool assembly closes the exhaust port, so that the gas in the exhaust chamber is discharged from the inflation port to the airbag; in the exhaust state, the spool assembly opens the exhaust port, so that the gas in the airbag enters from the inflation port and is discharged from the exhaust port.

2. The air pump according to claim 1, characterized in that, The air pump further includes a control board disposed in the receiving chamber and dividing the receiving chamber into a communicating installation chamber and a buffer chamber. The solenoid valve is disposed in the installation chamber, and the housing is provided with an air outlet communicating with the buffer chamber.

3. The air pump according to claim 2, characterized in that, One of the control board and the valve body is provided with a limiting shaft, and the other is provided with a limiting hole for the limiting shaft to pass through.

4. The air pump according to claim 2, characterized in that, The air pump further includes a pressure regulating valve disposed in the buffer chamber and communicating with the exhaust chamber. The pressure regulating valve is used to regulate the air pressure in the exhaust chamber.

5. The air pump according to claim 4, wherein The pump body includes a motor assembly and a compression assembly having a plurality of compression chambers. The motor assembly is disposed at one end of the compression assembly away from the housing, and the motor assembly is used to drive the compression chambers to compress gas; the exhaust chamber includes a central chamber and a plurality of exhaust chambers communicating with the central chamber. The plurality of exhaust chambers communicate with the compression chambers in a one-to-one correspondence, and the solenoid valve and the pressure regulating valve each communicate with one of the exhaust chambers.

6. The air pump according to claim 5, wherein, There are two solenoid valves, and the two solenoid valves are arranged side by side in the installation chamber and communicate with the two exhaust chambers in a one-to-one correspondence.

7. The air pump according to claim 1, characterized in that, The spool assembly includes a first spool, a second spool and an elastic member. The first spool is disposed through one end of the inner cavity close to the exhaust hole and forms an intake passage communicating the exhaust hole and the inner cavity. The second spool is disposed between the exhaust port and the first spool and has a gap with the inner peripheral wall of the inner cavity. The second spool can approach or move away from the first spool to open or close the exhaust port. The elastic member is disposed in the intake passage, with one end abutting against the inner wall of the intake passage and the other end abutting against the second spool.

8. The air pump according to claim 7, characterized in that, At least a part of one side surface of the second spool close to the first spool is provided with a first sealing member. The first sealing member abuts against the elastic member and can block the intake passage in the exhaust state; And / or, at least a part of one side surface of the second spool close to the exhaust port is provided with a second sealing member. In the inflation state, the second sealing member blocks the exhaust port; And / or, a guiding rib is provided on the inner wall surface of the inner cavity corresponding to the second valve core, and the guiding rib extends along the moving direction of the second valve core.

9. The air pump according to claim 7, characterized in that, A first clamping groove is formed on the outer wall of one end of the first valve core extending out of the inner cavity, and a second clamping groove is formed on the outer wall of one end of the valve body away from the first clamping groove; the solenoid valve further includes a fixing bracket arranged on the outer periphery of the valve body, and opposite ends of the fixing bracket are correspondingly arranged in the first clamping groove and the second clamping groove.

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