Built-in constant-pressure air pump

Abstract

The utility model discloses a built-in constant-pressure air pump which comprises a shell, an inflation fan, an air pressure detection module and a fan control module, wherein the inflation fan, the air pressure detection module and the fan control module are arranged in the shell. The air pressure detection module is used for detecting the air pressure in the air model and outputting a signal to the fan control module; the fan control module controls the inflation fan to inflate or deflate; a first air vent and a second air vent corresponding to the air inlet and the air outlet of the inflation fan are formed in the shell; a gas non-return structure is arranged on the second vent hole and is used for sealing the second vent hole when the inflation fan stops working, so that gas in the gas mold is prevented from leaking; according to the utility model, the gas non-return structure is arranged at the second air vent in a sliding manner, and the non-return piece is jacked open by gas generated when the inflation fan works, so that the interior of the gas mold is inflated; when the inflation fan stops working, gas in the gas mold pushes the non-return piece to close the second ventilation opening under the action of gas pressure, and the gas in the gas mold is effectively prevented from flowing back and leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to air pump technical field especially relates to a built-in constant pressure air pump. BACKGROUND

[0002] Inflatable air mold products such as inflatable bed, inflatable mattress, inflatable boat and the like are widely used in home leisure, outdoor camping, water entertainment and children's amusement and the like multiple scenes due to its light, portable, easy to store and the like characteristics. In order to ensure its normal use, air mold must be inflated by air blower and the like equipment before use, so that it reaches the set internal air pressure, thereby possessing the required supporting force and shape stability. At present, the air mold products widely used in the market generally adopt external inflatable air blower, and this kind of structure has certain inflation efficiency, but still has many deficiencies.

[0003] Firstly, the existing products generally lack air pressure automatic detection and adjustment function, and users usually need to judge whether inflation is in place by experience or manual pressing. This way not only has poor accuracy, but also is prone to inflation deficiency or overinflation. The former affects the bearing capacity and comfort of air mold, and the latter may cause air mold interface damage or material rupture, which has safety risk.

[0004] Secondly, the existing external air blower system lacks real-time detection mechanism for air mold internal air pressure, and the blower working state is completely separated from the air pressure state, which cannot realize intelligent control and dynamic adjustment, and cannot meet the actual demand of users on air mold air pressure constancy. During the inflation process or after the inflation is completed, if the air pressure drops due to external environment change or material leakage, the user can only manually inflate again, which is tedious and inefficient.

[0005] In addition, the traditional air mold blower usually adopts the way that the blower outlet is directly communicated with the air mold interface, and no effective air check structure is set, and after the blower stops running, the outlet channel is not closed, and reverse air leakage is prone to occur, which leads to slow loss of air mold internal gas, obvious air pressure drop, affects normal use experience, and even needs to be re-inflated in serious cases.

[0006] Therefore, it is necessary to further optimize to solve the problems existing in the above-mentioned prior art. INVENTION CONTENTS

[0007] Therefore, in order to solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a built-in constant pressure air pump.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0009] The built-in constant pressure air pump is fixed on the side wall of the air mold and inflates the inside of the air mold; comprising a shell and an inflation fan, an air pressure detection module and a fan control module arranged in the shell; the air pressure detection module is used for detecting the air pressure in the air mold and outputting a signal to the fan control module; the fan control module controls the inflation fan to inflate or deflate according to the signal of the air pressure detection module; the shell is provided with a first air vent and a second air vent corresponding to the air inlet and air outlet of the inflation fan; the second air vent is provided with a gas check valve structure, which is used to close the second air vent when the inflation fan stops working to prevent the gas in the air mold from leaking.

[0010] Further, the gas check valve structure includes a check valve arranged at the second air vent and slidable towards or away from the air outlet of the inflation fan; the check valve is provided with a sliding rod, and the second air vent is provided with a sliding groove for the sliding rod to slide; the end of the sliding rod is provided with a limiting block to prevent the sliding rod and the check valve from being separated from the second air vent.

[0011] Further, the second air vent is provided with a hollow limiting support, and the middle of the limiting support is provided with the sliding groove; the check valve is arranged in the sliding groove through the sliding rod, and the limiting block is located at one end of the sliding groove close to the inner side of the limiting support, and the end diameter of the limiting block close to the sliding groove is greater than the diameter of the sliding groove; the outer side of the limiting support is provided with a limiting part matched with the contour of the check valve, so that when the inflation fan stops working, the check valve is pushed by the air pressure of the air mold and abuts to close the limiting part, preventing the gas in the air mold from leaking.

[0012] Further, the check valve is made of silica gel; the edge of the check valve is provided with a guide inclined surface inclined from outside to center; the inner wall of the limiting part is circumferentially provided with a limiting edge matched with the guide inclined surface, and the guide inclined surface is fitted on the limiting edge.

[0013] Further, the outer side of the second air vent is covered with an air outlet frame, which is used to prevent the air mold fabric from collapsing and blocking the second air vent due to the decrease of internal pressure when the inflation fan stops working or deflates; the check valve is movably arranged in the inner cavity of the air outlet frame.

[0014] Further, the air outlet frame is a semicircular frame structure arranged in a reverse manner.

[0015] Further, a mounting frame is sleeved on the outer periphery of the shell, and the mounting frame is used to fix the shell to the inner wall of the air mold; the mounting frame is made of PVC material.

[0016] Further, the shell comprises a first shell and a second shell connected oppositely; the assembling frame is sleeved at the connection of the first shell and the second shell; the first shell is located outside the air mold, and the assembling frame and the second shell are located inside the air mold; the first air vent is arranged on the first shell, and the second air vent is arranged on the second shell.

[0017] Further, the air filling fan is a series excited motor or a centrifugal fan; a mounting connector is arranged at the second air vent, and an air outlet of the air filling fan is embedded in an inner cavity of the mounting connector and is fixed on the second air vent through the mounting connector.

[0018] Further, the air pressure detection module comprises a pressure sensor arranged on the shell and communicating with the inside of the air mold to detect the pressure in the air mold; the fan control module is mounted on a circuit board in the shell, is electrically connected with the pressure sensor, and receives a signal output by the pressure sensor; a DC power input end and a control switch are arranged on the shell; the DC power input end is used for connecting an external power supply; the control switch is arranged on the outer surface of the shell and is electrically connected with the circuit board, and is used for starting and stopping the air filling fan.

[0019] Further, a pressure regulating plate is arranged on the shell, is electrically connected between the DC power input end and the circuit board, and is used for reducing and stably controlling the input voltage.

[0020] Compared with the prior art, the utility model has at least the following advantages:

[0021] 1) The utility model discloses a gas check valve structure arranged at the air outlet end of the air filling fan, i.e. the second air vent, comprising a check valve made of silica gel and arranged in a sliding groove at the air outlet through a sliding rod; when the air filling fan works, the generated gas pushes the check valve away from the second air vent to inflate the inside of the air mold; when the air filling fan stops working, the gas in the air mold pushes the check valve to slide inwards automatically under the action of air pressure, so that the check valve adheres to the edge of the limiting part to close the second air vent, effectively preventing the backflow and leakage of the gas in the air mold, ensuring smooth air outlet when the fan works, and quickly and reliably realizing the closing action when the fan stops, forming a stable, slidable and resettable closed system.

[0022] 2)The utility model discloses a pressure sensor and fan control module are set up, realized real -time monitoring and intelligent control to the air mould internal pressure. When using, pressure sensor real -time acquisition air mould internal pressure data, when the air pressure reaches the set upper limit value, sensor sends signal to control circuit board, makes the fan stop working, and the check valve is closed automatically under the gas pressure in the air mould after the fan stops and prevents the air leakage. With the air mould natural air release leads to internal pressure drop, when the pressure is lower than the set lower limit value, sensor sends signal again and starts the fan, and recharges. So repeatedly, the automatic realization air mould internal constant pressure control, keep the air mould in the best appearance state, avoid over -charged or air pressure insufficient condition, improve the system automation and use convenience, especially suitable for long -term exhibition or outdoor application scene.

[0023] 3)To avoid the air mould in the fan stop working or enter the air release state, because the internal air pressure reduces and causes the air mould cloth to collapse, thereby hides even the problem of the fan outlet, the utility model discloses the air outlet frame structure outside the second vent of the shell, through the physical support effect, can guarantee the smooth air outlet to the air mould cloth under the low pressure state form the support blocking action of the natural drooping tendency, prevent the cloth to cover even completely cover the air outlet channel, and further cause the problem of the poor ventilation or the fan can not normally run.

[0024] Further, the air outlet frame also cooperates with the check valve arranged at the second vent, when the fan stops working, the check valve is pushed to the limiting support under the action of the air pressure in the air mould to complete the closing action, at this time, the air outlet frame prevents the external air mould cloth from interfering with the check valve, ensures the sealing fit state between the check valve and the vent, and further improves the sealing property and stability of the whole check system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the whole structure schematic diagram of the built -in constant pressure air pump of the preferred embodiment of the utility model;

[0026] Figure 2 It is the partial structure section schematic diagram of another angle of the built -in constant pressure air pump of the preferred embodiment of the utility model;

[0027] Figure 3 It is the partial structure schematic diagram of omitting the first shell of the built -in constant pressure air pump of the preferred embodiment of the utility model;

[0028] Figure 4 It is the whole structure exploded schematic diagram of the built -in constant pressure air pump of the preferred embodiment of the utility model;

[0029] Figure 5 It is the blowing fan working state schematic diagram of the built -in constant pressure air pump of the preferred embodiment of the utility model;

[0030] Figure 6 As Figure 5 The partial enlarged view at A in the middle;

[0031] Figure 7 As the working stop state schematic view of the built-in constant pressure air pump blowing fan in the preferred embodiment of the utility model;

[0032] Figure 8 As Figure 5 The partial enlarged view at B in the middle.

[0033] In the figure:

[0034] 1, shell; 11, first air vent; 12, second air vent; 121, sliding groove; 122, limiting support; 123, limiting part; 1231, limiting edge; 13, assembly frame; 14, first shell; 141, first buckle protrusion; 15, second shell; 151, first clamping groove; 2, air inflator; 21, air inlet; 22, air outlet; 23, mounting connector; 3, air pressure detection module; 31, pressure sensor; 4, fan control module; 41, circuit board; 5, gas check valve structure; 51, check valve; 511, guide slope; 52, sliding rod; 521, limiting block; 6, air outlet frame; 7, DC power input end; 8, control switch; 9, pressure regulating plate. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the utility model, the technical scheme and advantages of the utility model are further described in detail below in combination with the drawings and examples. The specific structure and characteristics of the utility model are described below by way of example, which should not constitute any limitation on the utility model. At the same time, any one of the technical features mentioned below (including implied or disclosed), as well as any one of the technical features directly shown or implied in the drawings, can be further combined or deleted between these technical features, so as to form more other embodiments that may not be directly or indirectly mentioned in the utility model. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms, and is not limited to the embodiments described herein.

[0036] In the description of the utility model, unless otherwise specified, the components used are conventional components in the prior art.

[0037] As Figures 1-8As shown, this utility model provides a built-in constant pressure air pump, which is fixed to the side wall of the inflatable model and inflates the inside of the model. It includes a housing 1 and an inflation fan 2, an air pressure detection module 3, and a fan control module 4 disposed within the housing 1. The air pressure detection module 3 detects the air pressure inside the inflatable model and outputs a signal to the fan control module 4. The fan control module 4 controls the inflation fan 2 to inflate or deflate according to the signal from the air pressure detection module 3. The housing 1 is provided with a first vent 11 and a second vent 12 corresponding to the air inlet 21 and air outlet 22 of the inflation fan 2. The second vent 12 is provided with a gas check structure 5, which is used to close the second vent 12 when the inflation fan 2 stops working, to prevent gas leakage inside the inflatable model.

[0038] In this embodiment, the inflation blower 2 is a series-wound motor or a centrifugal blower; a centrifugal blower is preferred. A mounting connector 23 is provided at the second vent 12, and the air outlet 22 of the inflation blower 2 is embedded in the inner cavity of the mounting connector 23 and correspondingly fixed to the second vent 12 via the mounting connector 23. Thus, by providing the mounting connector 23, the air outlet 22 of the blower can be precisely aligned with the second vent 12 on the housing 1, achieving a standardized connection.

[0039] Specifically, the housing 1 comprises two interlocking parts, which are mounted to the side wall of the inflatable model via an assembly frame 13. That is, the housing 1 includes a first housing 14 and a second housing 15 connected to each other. The assembly frame 13 is fitted onto the connection between the first housing 14 and the second housing 15. Furthermore, the assembly frame 13 is made of PVC material and can be installed on the side wall of the inflatable model using processes such as hot pressing. Simultaneously, the first housing 14 is located on the outside of the inflatable model, while the assembly frame 13 and the second housing 15 are located on the inside. The first housing 14 has a first vent 11, and the second housing 15 has a second vent 12. This design allows for the entry and exit of gas by creating channels on the inflatable model corresponding to the first vent 11 and the air inlet of the inflation fan 2. Generally, a grid structure is provided at the first vent 11.

[0040] In the embodiment, the first shell 14 and the second shell 15 can be connected through a snap structure, the first shell 14 is provided with a first snap protrusion 141 at the edge, and the second shell 15 is provided with a first snap groove 151 matched with the first snap protrusion 141. In this way, when assembling, the first snap protrusion 141 is embedded into the corresponding first snap groove 151 after the butt joint between the two shells is realized, and then fastening members such as screws are used for locking to realize stable installation. In the actual assembly process, the first shell 14 and the second shell 15 are first connected through the snap structure, and then the whole shell is embedded into the assembly frame 13, and then the assembly frame is fixed through hot pressing, so as to ensure that the whole structure is tightly fixed on the air mold.

[0041] In the embodiment, in order to avoid gas leakage, a gas check structure 5 is arranged at the second air inlet 12, which specifically includes a check piece 51 arranged at the second air inlet 12 and capable of sliding towards or away from the air outlet 22 of the inflating fan 2; the check piece 51 is provided with a sliding rod 52, the second air inlet 12 is provided with a sliding groove 121 for sliding of the sliding rod 52, and the sliding rod 52 is provided with a limiting block 521 for preventing the sliding rod 52 from being separated from the second air inlet 12.

[0042] Further, the second air inlet 12 is provided with a hollow limiting support 122, the middle part of the limiting support 122 is provided with the sliding groove 121, the check piece 51 is arranged in the sliding groove 121 through the sliding rod 52, the limiting block 521 is located at one end of the sliding groove 121 close to the inner side of the limiting support 122, and the diameter of the end of the limiting block 521 close to the sliding groove 121 is greater than the diameter of the sliding groove 121, the outer side of the limiting support 122 is provided with a limiting part 123 matched with the contour of the check piece 51, so that when the inflating fan 2 stops working, the check piece 51 is pushed by the air pressure of the air mold and abuts against the limiting part 123 to prevent the gas in the air mold from leaking.

[0043] In the embodiment, the limiting block 521 is a tapered limiting block 521 with a diameter gradually decreasing away from the check piece 51, and the diameter of one side in contact with the slot of the sliding groove 121 is greater than the diameter of the sliding groove 121, so as to prevent the check piece 51 from being pushed out of the sliding groove 121 when the inflating fan works.

[0044] In order to improve the sealing effect of the check element 51, the check element 51 can be made of elastic material, including but not limited to being made of silica gel material, and is adapted to be made into a circular check element 51 matched with the shape of the second air inlet 12; further, the edge of the check element 51 is provided with a guide slope 511 inclined from outside to the center; the inner wall of the limiting portion 123 is circumferentially provided with a limiting edge 1231 matched with the guide slope 511, and the guide slope 511 is fitted on the limiting edge 1231. In this way, when the check element 51 is pushed to abut against the limiting portion 123 under the internal pressure of the air mold, the guide slope 511 of the edge is just fitted on the limiting edge 1231, improving the sealing performance and preventing air leakage.

[0045] Therefore, the utility model discloses the air check structure 5 at the air outlet end of the inflation fan 2, i.e. the second air inlet 12, including the check element 51 made of silica gel, and being arranged in the sliding groove 121 at the air outlet 22 through the slide rod 52; when the inflation fan 2 works, the generated gas pushes the check element 51 away from the second air inlet 12 to inflate the air mold; when the inflation fan 2 stops working, the gas in the air mold pushes the check element 51 to slide inwards automatically under the action of air pressure, thereby fitting the edge of the limiting portion 123, reliably closing the air outlet 22, effectively preventing the backflow and leakage of the gas in the air mold, not only ensuring smooth air outlet when the fan works, but also quickly and reliably realizing the closing action when stopping, forming a stable, slidable and resettable closing system.

[0046] To further improve the smoothness of air mold inflation and deflation, the second air inlet 12 is optionally covered with an air outlet frame 6, which is used to prevent the air mold fabric from collapsing and blocking the second air inlet 12 due to internal pressure drop when the inflation fan 2 stops working or deflates; the check element 51 is movably arranged in the inner cavity of the air outlet frame 6. In this embodiment, the air outlet frame 6 is a semicircular frame structure arranged in reverse. In this embodiment, the air outlet frame 6 is designed as a hollow support frame, adopting a semicircular skeleton structure, arranged outside the second air inlet 12, which can not only ensure smooth airflow, but also support and block the natural drooping tendency of the air mold fabric under low pressure, preventing the fabric from covering or even completely covering the air outlet channel, thereby causing poor ventilation or fan malfunction.

[0047] Further, the air outlet frame 6 also cooperates with the check element 51 arranged at the second air inlet 12, when the fan stops working, the check element 51 is pushed to the limiting support 122 under the action of the internal air pressure of the air mold to complete the closing action, at this time the air outlet frame 6 prevents the external air mold fabric from interfering with the check element 51, ensuring the sealing and fitting state between the check element 51 and the air inlet, further improving the sealing and stability of the entire sealing system.

[0048] Further introduce the internal air pressure control of the air mold: the air pressure detection module 3 includes a pressure sensor 31, the pressure sensor 31 is arranged on the shell 1 and communicates with the air mold inside, to detect the air pressure in the air mold; The fan control module 4 is installed on the circuit board 41 inside the shell 1, and is electrically connected with the pressure sensor 31 and receives the signal output by the pressure sensor 31; The shell 1 is provided with a DC power input end 7 and a control switch 8, the DC power input end 7 is used for connecting an external power supply, and the control switch 8 is arranged on the outer surface of the shell 1 and is electrically connected with the circuit board 41, for starting and stopping the air charging fan 2. In this embodiment, the fan control module 4 and the air pressure detection module 3 work together to keep the internal air pressure of the air mold within 20-30 pa.

[0049] And, the shell 1 is provided with a pressure regulating plate 9, which is electrically connected between the DC power input end 7 and the circuit board 41, for voltage reduction and stable control of the input voltage. Since the external power supply is connected through the DC port, there is a risk of voltage fluctuation in different use environments, and if the circuit board 41 and the fan are directly input, it may cause damage to components or unstable performance. The setting of the voltage regulating plate 9 can reduce and stabilize the input voltage, and adjust the fluctuating or high input voltage to a stable voltage value suitable for the internal control circuit and the fan operation. Stable voltage supply is the basis for the normal work of the pressure sensor 31 and the fan control module 4. Constant power supply is realized through the voltage regulating plate 9, which can avoid detection errors or control logic abnormalities caused by voltage fluctuation.

[0050] In this embodiment, the fan control module 4 can use single-chip microcomputer or MCU control board integrated driving function, and the circuit board 41 can be a PCB board; The pressure sensor 31 can be a capacitive, piezoresistive or MEMS micro pressure sensor 31; The voltage regulating plate 9 can be based on mature voltage reducing chip module on the market, realize, cooperate with capacitors, inductors, resistors and other components to form a complete DC-DC voltage stabilizing circuit, and its working principle and installation method can refer to the prior art.

[0051] The working process is roughly as follows: in the use process, the user supplies power through the DC power input end 7, opens the control switch 8, and the fan starts to work; The pressure sensor 31 collects the internal pressure data of the air mold in real time, and when the air pressure reaches the set upper limit value, the sensor sends a signal to the control circuit board 41 to stop the fan; After the fan stops, the check valve automatically closes the air outlet to prevent air leakage. With the natural air release of the air mold, when the pressure is lower than the set lower limit value, the sensor sends a signal to start the fan again to recharge. Such a cycle is repeated, and the internal constant pressure control of the air mold is automatically realized, the air mold is kept in the best appearance state, the overcharging or air pressure shortage is avoided, and the system automation and use convenience are improved.

[0052] It should be noted that the related electrical components involved in the present application, such as switching elements, DC input interfaces, power supply connection lines, driver devices, signal processing circuits, protection circuits, power indicator lights, connection terminals, micro processing units (MCU), etc., all belong to mature technical solutions that can be easily selected, combined and implemented by those skilled in the art based on existing technology. The above-mentioned elements can refer to and select the existing electronic modules or electrical components widely used in portable fans, air pumps and electric control equipment in the market.

[0053] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. For those skilled in the art, it can be understood that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A built-in constant pressure air pump, which is fixed on the side wall of an air mold and inflates the inside of the air mold; characterized in that, The air pressure detection module is used for detecting the air pressure inside the air mold and outputting a signal to the fan control module; the fan control module controls the air charging fan to charge or discharge according to the signal of the air pressure detection module; the shell is provided with a first air vent and a second air vent corresponding to the air inlet and the air outlet of the air charging fan; the second air vent is provided with a gas check valve structure, which is used to close the second air vent when the air charging fan stops working, so as to prevent the gas inside the air mold from leaking.

2. The internal constant pressure air pump of claim 1, wherein, The gas check valve structure includes a check valve arranged at the second air vent and capable of sliding towards or away from the air outlet of the air charging fan; the check valve is provided with a sliding rod, and the second air vent is provided with a sliding groove for the sliding rod to slide; the end of the sliding rod is provided with a limiting block for preventing the sliding rod and the check valve from being separated from the second air vent.

3. The internal constant pressure gas pump of claim 2, wherein, The second air vent is provided with a hollow limiting support, and the middle of the limiting support is provided with the sliding groove; the check valve is arranged in the sliding groove through the sliding rod, the limiting block is located at one end of the sliding groove close to the inner side of the limiting support, and the diameter of the end of the limiting block close to the sliding groove is greater than the diameter of the sliding groove; the outer side of the limiting support is provided with a limiting part matched with the contour of the check valve, so that when the air charging fan stops working, the check valve is pushed by the air pressure of the air mold and abuts to close the limiting part, preventing the gas inside the air mold from leaking.

4. The internal constant pressure gas pump of claim 3, wherein, The check valve is made of silica gel; the edge of the check valve is provided with a guide inclined surface inclined from the outside to the center; the inner wall of the limiting part is circumferentially provided with a limiting edge matched with the guide inclined surface, and the guide inclined surface is fitted on the limiting edge.

5. An internal constant pressure gas pump according to any one of claims 2-4, characterized in that The outer side of the second air vent is covered with an air outlet frame, which is used to prevent the air mold fabric from collapsing and blocking the second air vent due to the decrease of internal pressure when the air charging fan stops working or discharges; the check valve is movably arranged in the inner cavity of the air outlet frame.

6. The internal constant pressure gas pump of claim 5, wherein, The shell is provided with a mounting frame, which is used to fix the shell to the inner wall of the air mold; the mounting frame is made of PVC material.

7. The internal constant pressure gas pump of claim 6, wherein, The shell includes a first shell and a second shell connected to each other; the mounting frame is sleeved at the connection of the first shell and the second shell; the first shell is located on the outer side of the air mold, and the mounting frame and the second shell are located on the inner side of the air mold; the first air vent is arranged on the first shell, and the second air vent is arranged on the second shell.

8. The internal constant pressure gas pump of claim 7, wherein, The air charging fan is a series motor or a centrifugal fan; the second air vent is provided with a mounting connector, and the air outlet of the air charging fan is embedded in the inner cavity of the mounting connector and fixed on the second air vent through the mounting connector.

9. The internal constant pressure gas pump of claim 8, wherein, The air pressure detection module comprises a pressure sensor arranged on the shell and communicating with the inside of the air mold to detect the pressure in the air mold; the fan control module is installed on the circuit board inside the shell, electrically connected with the pressure sensor and receiving the signal output by the pressure sensor; the shell is provided with a DC power input end and a control switch, the DC power input end is used for connecting an external power supply, and the control switch is arranged on the outer surface of the shell and electrically connected with the circuit board to start and stop the inflation fan.

10. The internal constant pressure gas pump of claim 9, wherein, The shell is provided with a voltage regulation plate electrically connected between the DC power input end and the circuit board to reduce and stabilize the input voltage.

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