Mobile phone negative pressure adsorption device

Abstract

The utility model belongs to the technical field of connecting devices, and relates to a mobile phone negative pressure adsorption device which is suitable for adsorbing and fixing a mobile phone and comprises an adsorption disc, an outer shell, an inner cavity assembly arranged in the outer shell, an air pump, a negative pressure sensing valve and a circuit board. The inner cavity assembly comprises an inner cavity bottom plate and an inner cavity upper cover which are in sealing fit, a space is reserved between the inner cavity bottom plate and the inner cavity upper cover to form an independent inner negative pressure cavity, the adsorption disc is provided with an outer negative pressure cavity, and the outer negative pressure cavity and the inner negative pressure cavity are communicated with each other; the air extracting pump and the negative pressure sensing valve are arranged in the outer shell, are electrically connected with the circuit board and are communicated with the inner negative pressure cavity through an air pipe; the inner negative pressure cavity is provided with a one-way pressure retaining valve to prevent air from flowing back into the inner negative pressure cavity in the air exhaust process. The mobile phone support has the beneficial effects that the structure of the mobile phone support is optimized and simplified, the difficulty of production and assembly is reduced, and the technical problems that an existing mobile phone support with a sucker is relatively complicated in structure and troublesome to assemble are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting devices, in particular to a mobile phone negative pressure adsorption device. Background Art

[0002] More and more of the existing sucker mobile phone holders have transitioned from natural adsorption to negative pressure adsorption. Chinese Patent CN 213906729 U discloses a sucker mobile phone holder, which includes a sucker and a holder. There is an air chamber, a circuit board, an air pump and a pressure switch inside the holder. The air chamber has air ducts that are interconnected with the sucker, the air pump and the pressure switch. The circuit board is electrically connected to the air pump and the pressure switch. One end of the circuit board is the starting end, and the starting end controls the start of the air pump. The other end of the circuit board is the control end, and the control end is connected to the pressure switch. The control end cooperates with the pressure switch to control the start or stop of the air pump.

[0003] However, this kind of sucker mobile phone holder has a relatively complex structure, is troublesome to assemble, and requires a large amount of air to be pumped during air extraction. Summary of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a mobile phone negative pressure adsorption device, which solves the technical problems of the existing sucker mobile phone holder having a relatively complex structure and being troublesome to assemble.

[0006] (II) Technical Solutions

[0007] In order to achieve the above object, the main technical solutions adopted by the utility model include:

[0008] An embodiment of the utility model provides a mobile phone negative pressure adsorption device suitable for adsorbing and fixing a mobile phone, which includes an adsorption disc, an outer housing, an inner cavity assembly placed in the outer housing, an air pump, a negative pressure induction valve and a circuit board;

[0009] Among them, the inner cavity assembly includes a sealingly fitted inner cavity bottom plate and an inner cavity upper cover, and a space is reserved between the two to form an independent inner negative pressure cavity. The adsorption disc is provided with an outer negative pressure cavity, and the outer negative pressure cavity communicates with the inner negative pressure cavity; the air pump and the negative pressure induction valve are installed in the outer housing, are electrically connected to the circuit board together, and are communicated with the inner negative pressure cavity through an air pipe; a one-way pressure maintaining valve is installed in the inner negative pressure cavity to prevent air from flowing back into the inner negative pressure cavity during the air extraction process.

[0010] Optionally, one side of the top surface of the inner cavity bottom plate is provided with a mounting groove adapted to the inner cavity upper cover, the one-way pressure maintaining valve is fixedly installed in the mounting groove, and the inner cavity upper cover is sealingly fitted with the mounting groove;

[0011] The cross-section of the one-way pressure maintaining valve is an inverted "V" shape, and a long strip-shaped opening is provided at its top.

[0012] Optionally, the device further includes a stroke trigger rod and a stroke switch. The lower end of the stroke trigger rod is movably connected to the suction cup. A first contact for contact and cooperation with the stroke switch is provided in the middle thereof. A stroke return spring is sleeved on the top end thereof, and the top of the stroke return spring abuts against the inner wall of the top of the outer housing. The stroke switch is electrically connected to the circuit board;

[0013] The negative pressure induction valve, the circuit board and the air extraction pump are all installed on the top surface of the inner cavity bottom plate. An air pipe interface is provided at the top of the inner cavity upper cover at a position opposite to the one-way pressure maintaining valve. The air pipe interface, the air extraction pump and the negative pressure induction valve are connected together through a three-way air pipe.

[0014] Optionally, the suction cup is provided with a suction hole. The inner cavity bottom plate is provided with a nozzle at a position corresponding to the suction hole. The nozzle passes through the outer housing and cooperates with the suction hole. A protrusion is provided at a position between the top of the nozzle and the one-way pressure maintaining valve on the inner cavity bottom plate to form a three-way air hole. The three-way air hole communicates with the outer negative pressure cavity, the inner negative pressure cavity and the one-way pressure maintaining valve respectively.

[0015] Optionally, the bottom edge of the one-way pressure maintaining valve is stuck between the protrusion and the inner cavity upper cover to fix the one-way pressure maintaining valve at a position between the inner cavity bottom plate and the inner cavity upper cover.

[0016] Optionally, the inner cavity assembly further includes an exhaust unit. The exhaust unit includes an exhaust return spring, an exhaust valve rod and a button. The exhaust return spring is fixed in the inner negative pressure cavity. The exhaust valve rod is slidably arranged in the negative pressure inner cavity, and its inner end is inserted into the exhaust return spring. A frustum for sealing abutment against the inner wall of the inner cavity bottom plate is provided in the middle thereof. Its outer end extends out of the inner negative pressure cavity and is connected to the button together. The button is exposed on the side wall of the outer housing.

[0017] Optionally, a sealing ring is provided at the contact position between the nozzle and the bottom shell.

[0018] Optionally, the outer housing sequentially includes an upper shell cover, an upper shell ring, a permanent magnet, a middle shell and a bottom shell from top to bottom;

[0019] The top surface of the upper shell cover is used for cooperation with the universal bracket. A groove is provided on the top surface of the upper shell ring. The permanent magnet is installed in the groove. The suction cup is fixedly installed on the bottom shell.

[0020] Optionally, the device further includes a power supply body. A mounting plate is fixedly provided on the inner cavity bottom plate. The power supply body is installed on the mounting plate.

[0021] Optionally, a wireless charging magnetic ring is provided between the inner cavity bottom plate and the bottom shell.

[0022] (III) Beneficial effects

[0023] The beneficial effects of the present utility model are:

[0024] 1. A negative pressure adsorption device for mobile phones of the present utility model uses an inner cavity bottom plate and an inner cavity upper cover, with a space reserved between them to form an independent inner negative pressure cavity. The lower part of the inner negative pressure cavity communicates with the outer negative pressure cavity, and the upper part is connected to an air pump and a negative pressure induction valve through an air pipe. A one-way pressure maintaining valve is installed in the inner negative pressure cavity to prevent air from flowing back into the inner negative pressure cavity during the air extraction process. Compared with the prior art, it can optimize the structure of the device, making the structure of the device more concise and stable, reducing the difficulty of production and assembly, and solving the technical problems of the existing sucker mobile phone bracket having a relatively complex structure and troublesome assembly.

[0025] 2. An independent inner negative pressure cavity is adopted, and the negative pressure induction valve is arranged outside the inner negative pressure cavity. The inner negative pressure cavity is connected to the air pump and the negative pressure induction valve through a three-way air pipe. The structure is simple, and the assembly is simpler and more convenient. It reduces the volume and quantity of the chambers that actually need to extract air. The air pump needs to extract less air and can adsorb the mobile phone faster. The air tightness of the device is higher, the stability is better, and air leakage is not likely to occur during long-term use.

[0026] 3. A one-way pressure maintaining valve is set to effectively prevent air from flowing back into the inner negative pressure cavity during the air extraction process, and the air extraction efficiency is higher.

[0027] 4. The air pump is started to extract air through the cooperation of a travel trigger rod and a travel switch, and a negative pressure induction valve is used to maintain a preset negative pressure, that is, a mechanical control method is adopted. There is no need to set a control chip and a negative pressure induction chip anymore. The circuit board structure is simpler, the production cost is more saved, and it is more energy-efficient.

[0028] 5. The air extraction time can be adjusted according to the actual sizes of the outer negative pressure cavity and the inner negative pressure cavity, and then the adsorption force of the device can be changed.

[0029] 6. A mechanical negative pressure induction valve is adopted, and the rated air pressure parameters for starting and stopping air extraction can be adjusted according to actual needs, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional schematic diagram of a negative pressure adsorption device for mobile phones of the present utility model;

[0031] Figure 2 An exploded schematic diagram of a negative pressure adsorption device for mobile phones of the present utility model;

[0032] Figure 3 A cross-sectional schematic diagram of a negative pressure adsorption device for mobile phones of the present utility model (untriggered state);

[0033] Figure 4 A cross-sectional schematic diagram of a negative pressure adsorption device for mobile phones of the present utility model (triggered state);

[0034] Figure 5Partial three-dimensional schematic diagram of a mobile phone negative pressure adsorption device of the present utility model (in the state of removing the upper shell);

[0035] Figure 6 Partial exploded schematic diagram of a mobile phone negative pressure adsorption device of the present utility model;

[0036] Figure 7 Bottom view schematic diagram of a mobile phone negative pressure adsorption device of the present utility model;

[0037] Figure 8 Top view schematic diagram of a mobile phone negative pressure adsorption device of the present utility model (in the state of removing the upper shell);

[0038] Figure 9 is Figure 8 the cross-sectional view at A-A in

[0039] Figure 10 is Figure 8 the cross-sectional view at B-B in

[0040]

Description of the reference numerals

[0041] 1. Outer housing; 111. Upper shell cover; 112. Upper shell ring; 12. Permanent magnet; 13. Middle shell; 14. Bottom shell;

[0042] 2. Adsorption disc; 21. Outer negative pressure chamber; 22. Suction hole;

[0043] 3. Inner cavity assembly; 31. Inner cavity bottom plate; 32. Inner cavity upper cover; 321. Air pipe interface; 33. One-way pressure maintaining valve; 34. Three-way air hole; 340. Protrusion; 35. Exhaust unit; 351. Exhaust return spring; 352. Exhaust valve rod; 353. Button;

[0044] 4. Air pump;

[0045] 51. Stroke trigger rod; 511. First contact; 52. Stroke switch; 521. Second contact; 53. Stroke return spring; 54. Negative pressure induction valve;

[0046] 61. Power supply body; 62. Mounting plate; 621. Spring groove; 63. Charging port; 64. Wireless charging magnetic ring;

[0047] 7. Circuit board;

[0048] 8. Sealing ring. Detailed implementation manners

[0049] For better explaining the present utility model for easy understanding, the present utility model will be described in detail below with reference to the accompanying drawings through specific implementation manners. Among them, the orientation nouns such as "upper" and "lower" mentioned in this article are based on Figure 3The orientation is for reference. Here, the direction where the upper shell cover 111 is located is "up", and the direction where the bottom shell 14 is located is "down".

[0050] A mobile phone negative pressure adsorption device proposed by an embodiment of the present utility model is applicable to adsorb and fix a mobile phone, and includes an adsorption disc, an outer shell, an inner cavity assembly placed in the outer shell, an air extraction pump, a negative pressure induction valve, and a circuit board; the inner cavity assembly includes a sealed inner cavity bottom plate and an inner cavity upper cover, and a space is reserved between the two to form an independent inner negative pressure cavity. The adsorption disc is provided with an outer negative pressure cavity, and the outer negative pressure cavity communicates with the inner negative pressure cavity; the air extraction pump and the negative pressure induction valve are installed in the outer shell, are electrically connected to the circuit board together, and are communicated with the inner negative pressure cavity through an air pipe; a one-way pressure maintaining valve is installed in the inner negative pressure cavity to prevent air from flowing back into the inner negative pressure cavity during the air extraction process; due to the use of the inner cavity bottom plate and the inner cavity upper cover, a space is reserved between the two to form an independent inner negative pressure cavity, the inner negative pressure cavity communicates with the outer negative pressure cavity below, and communicates with the air extraction pump and the negative pressure induction valve through an air pipe above. Compared with the prior art, the structure of the device is optimized, the structure of the device is more concise, the difficulty of production and assembly is reduced, and the technical problems that the existing sucker mobile phone bracket has a relatively complex structure and is troublesome to assemble are solved.

[0051] To better understand the above technical solution, the exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more clear and thorough understanding of the present utility model and to be able to convey the scope of the present utility model completely to those skilled in the art.

[0052] Embodiment:

[0053] Refer to Figure 1 and Figure 2 For a mobile phone negative pressure adsorption device in this embodiment, it is applicable to adsorb and fix a mobile phone, and includes an adsorption disc 2, an outer shell 1, an inner cavity assembly 3 placed in the outer shell 1, an air extraction pump 4, a negative pressure induction valve 54, and a circuit board 7.

[0054] Refer to Figure 5 and Figure 6 Among them, the inner cavity assembly 3 includes a sealed inner cavity bottom plate 31 and an inner cavity upper cover 32, and a space is reserved between the two to form an independent inner negative pressure cavity. The adsorption disc 2 is in a horn shape and is provided with an outer negative pressure cavity 21, and the outer negative pressure cavity 21 communicates with the inner negative pressure cavity; the air extraction pump 4 and the negative pressure induction valve 54 are installed in the outer shell 1, are electrically connected to the circuit board 7 together, and are communicated with the inner negative pressure cavity through an air pipe; a one-way pressure maintaining valve 33 is installed in the inner negative pressure cavity to prevent air from flowing back into the inner negative pressure cavity during the air extraction process.

[0055] In the actual application process, the suction cup 2 can be made of silica gel or other soft rubber materials with good airtightness. The top surface of the suction cup 2 is provided with a movable groove, which extends downward into the outer negative pressure chamber 21 and does not penetrate the bottom surface of the suction cup 2. The negative pressure induction valve 54 is a mechanical air pressure induction mechanism, which is a prior art and will not be elaborated here.

[0056] Refer to Figure 10 , the cross-section of the one-way pressure maintaining valve 33 is an inverted "V" shape, and a long strip-shaped opening is provided at its top, and only allows air to be discharged from the inner negative pressure chamber and does not allow air to enter the inner negative pressure chamber. The one-way pressure maintaining valve 33 can be made of silica gel or other soft rubber materials. One side of the top surface of the inner cavity bottom plate 31 is provided with a mounting groove adapted to the inner cavity upper cover 32. The four peripheral edges of the inner cavity upper cover 32 are hermetically fitted with the top surface of the mounting groove. A channel extending downward is provided in the middle of the bottom surface of the inner cavity upper cover 32, and a notch is provided on the inner side of the lower end of the channel. The one-way pressure maintaining valve 33 is fixedly installed in the mounting groove. Among them, the bottom of the one-way pressure maintaining valve 33 is installed in the notch and abuts against the notch and the protruding portion 340 described later. The upper part of the one-way pressure maintaining valve 33 extends into the channel, and its top is opposite to the trachea interface 321.

[0057] In the actual production and application process, the inner cavity bottom plate 31 and the mounting groove can be separately provided. Correspondingly, the structure for realizing the air extraction function provided on the inner cavity bottom plate 31 is adaptively moved to the mounting groove, that is, the mounting groove and the inner cavity upper cover 32 form an independent inner cavity device.

[0058] Refer to Figure 3 and Figure 4 , the device further includes a stroke trigger rod 51 and a stroke switch 52. The lower end of the stroke trigger rod 51 is slidably matched with the suction cup 2. A first contact 511 is provided in the middle thereof. The first contact 511 is used for contact cooperation with a second contact 521 for contacting the stroke switch 52. A stroke return spring 53 is sleeved on the top end thereof, and the top end of the stroke return spring 53 abuts against the inner wall of the top of the outer housing 1. The stroke return spring 53 is used to push the stroke trigger rod 51 to move downward to return to its original position. The stroke switch 52 is electrically connected to the circuit board 7.

[0059] As Figure 3 shown, when the device is not triggered, the stroke trigger rod 51 is inserted into the movable groove of the suction cup 2, and the first contact 511 is located below the second contact 521. As Figure 4As shown, when the device is triggered, that is, when the surface pressing stroke of the mobile phone triggers the stroke trigger rod 51, the stroke trigger rod 51 moves upward, disengages from the movable slot of the suction disc 2, and the first contact 511 slides past the second contact 521 and moves to a position above the second contact 521. At this time, the air pump 4 starts to extract the air in the inner negative pressure chamber and the outer negative pressure chamber 21 until a preset time is reached, so that the suction attachment adsorbs and fixes the mobile phone. Under the action of the stroke return spring 53, the stroke trigger rod 51 gradually returns to its original position.

[0060] When the air pressure in the inner negative pressure chamber is less than the preset value, the negative pressure induction valve 54 sends a signal to the circuit board 7, and the circuit board 7 controls the air pump 4 to start pumping air until the air pressure in the inner negative pressure chamber reaches the requirement, maintaining the adsorption and fixing effect on the mobile phone. Conversely, when the air pressure in the inner negative pressure chamber reaches the preset requirement, the negative pressure induction valve 54 converts the sensed air pressure change into an electrical signal and sends it to the circuit board 7, and the circuit board 7 controls the air pump 4 to stop pumping air. The stroke trigger rod 51, the stroke switch 52, and the negative pressure induction valve 54 are used in combination to form a mechanical air pumping trigger mechanism, making the working stability of the device stronger.

[0061] In actual production, the trigger assembly composed of the stroke trigger rod 51 and the stroke switch 52 can also be used alternatively with the negative pressure induction valve 54.

[0062] Refer to Figure 6 , the negative pressure induction valve 54, the circuit board 7, and the air pump 4 are all installed on the top surface of the inner cavity bottom plate 31. An air pipe interface 321 is provided at the top of the inner cavity upper cover 32 at a position opposite to the one-way pressure maintaining valve 33. The air pipe interface 321, the air inlet of the air pump 4, and the negative pressure induction valve 54 are connected together through a three-way air pipe. The gas in the inner negative pressure chamber is discharged to the outside through the air outlet of the air pump 4.

[0063] Refer to Figure 6 , Figure 7 and Figure 10 , the suction disc 2 is provided with air suction holes 22. The inner cavity bottom plate 31 is provided with air nozzles at positions corresponding to the air suction holes 22. The air nozzles pass through the outer housing 1 and are inserted and matched with the air suction holes 22. The inner cavity bottom plate 31 is provided with a protrusion 340 at a position between the top of the air nozzle and the one-way pressure maintaining valve 33 to form a three-way air hole 34. The three-way air hole 34 communicates with the outer negative pressure chamber 21, the inner negative pressure chamber, and the one-way pressure maintaining valve 33 respectively; the bottom edge of the one-way pressure maintaining valve 33 is stuck between the protrusion 340 and the inner cavity upper cover 32 to fix the one-way pressure maintaining valve 33 at a position between the inner cavity bottom plate 31 and the inner cavity upper cover 32; setting the protrusion 340 not only forms the three-way air hole 34 but also optimizes the structure of the inner negative pressure chamber. A sealing ring 8 is provided at the contact position between the air nozzle and the top surface of the bottom shell 14 to improve the airtightness of the position of the suction attachment.

[0064] Refer to Figure 6 and Figure 9, the inner cavity assembly 3 further includes an exhaust unit 35. The exhaust unit 35 includes an exhaust return spring 351, an exhaust valve stem 352, and a button 353. The exhaust return spring 351 is fixed in the inner negative pressure cavity. The exhaust valve stem 352 is slidably disposed in the negative pressure inner cavity, and its inner end is inserted into the exhaust return spring 351. A frustum for sealingly abutting against the inner wall of the inner cavity bottom plate 31 is provided in the middle thereof, and its outer end extends out of the inner negative pressure cavity and is connected to the button 353. The button 353 is exposed on the side wall of the outer housing 1. During use, when the button 353 is pressed, the frustum leaves the inner wall of the inner cavity bottom plate 31, and thus the inner negative pressure cavity and the outside can be communicated, and the adsorption and fixation of the adsorbing member to the mobile phone can be released.

[0065] Refer to Figure 2 and Figure 3 , the outer housing 1 sequentially includes an upper shell cover 111, an upper shell ring 112, a permanent magnet member 12, a middle shell 13, and a bottom shell 14 from top to bottom. The top surface of the upper shell cover 111 is used to cooperate with the universal bracket. A groove is provided on the top surface of the upper shell ring 112, and the permanent magnet member 12 is installed in the groove. The adsorption disc 2 is fixedly installed on the bottom shell 14. Multiple circles of folds are provided around the center position of the top surface of the adsorption disc 2. The permanent magnet member 12 is a permanent magnet ring, which provides magnetic suction force so that the top surface of the outer housing 1 can be magnetically adsorbed and fixed on the universal bracket of the mobile phone, and the adsorption disc 2 is used to adsorb and fix the mobile phone.

[0066] In the actual application process, the mobile phone negative pressure adsorption device can also be applied to other usage scenarios. The top surface of the outer housing 1 can magnetically adsorb other magnetic objects, and the adsorption disc 2 can adsorb other objects with a smooth surface.

[0067] Continue to refer to Figure 2 , Figure 3 and Figure 8 , the device further includes a power supply component. The power supply component includes a power supply body 61. An installation plate 62 is fixedly provided on the inner cavity bottom plate 31. The power supply body 61 is a storage battery and is installed on the installation plate 62. A charging port 63 is provided on the side wall of the middle shell 13. The pins of the charging port 63 are welded to the bottom surface of the circuit board 7. A wireless charging magnetic ring 64 is further provided between the inner cavity bottom plate 31 and the bottom shell 14. Therefore, the device can charge the power supply body 61 in a wired charging or wireless charging manner. A spring groove 621 is also provided on the installation plate 62, and the stroke trigger rod 51 and the stroke return spring 53 can slide in the spring groove 621.

[0068] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying 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 one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0069] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0070] In the present utility model, unless otherwise clearly defined and limited, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0071] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A mobile phone negative pressure adsorption device, which is suitable for adsorbing and fixing a mobile phone, and is characterized in that: It includes a suction cup (2), an outer housing (1), an inner cavity assembly (3) placed in the outer housing (1), an air extraction pump (4), a negative pressure induction valve (54), and a circuit board (7); Among them, the inner cavity assembly (3) includes a sealingly mated inner cavity bottom plate (31) and an inner cavity upper cover (32), with a space reserved between the two to form an independent inner negative pressure cavity. The suction cup (2) is provided with an outer negative pressure cavity (21), and the outer negative pressure cavity (21) communicates with the inner negative pressure cavity; The air extraction pump (4) and the negative pressure induction valve (54) are installed in the outer housing (1), both of which are connected to the inner negative pressure cavity through air pipes and are electrically connected to the circuit board (7); A one-way pressure maintaining valve (33) is installed in the inner negative pressure cavity to prevent air from flowing back into the inner negative pressure cavity during the air extraction process.

2. The negative pressure adsorption device for mobile phone according to claim 1, wherein: On one side of the top surface of the inner cavity bottom plate (31), there is an installation groove adapted to the inner cavity upper cover (32). The one-way pressure maintaining valve (33) is fixedly installed in the installation groove, and the inner cavity upper cover (32) is in sealing fit with the installation groove; The cross-section of the one-way pressure maintaining valve (33) is an inverted "V" shape, and a long strip-shaped opening is provided at its top.

3. The mobile phone negative pressure adsorption device according to claim 2, wherein: The device further includes a stroke trigger rod (51) and a stroke switch (52). The lower end of the stroke trigger rod (51) is movably connected to the suction cup (2). A first contact (511) for contacting and cooperating with the stroke switch (52) is provided in the middle thereof. A stroke return spring (53) is sleeved on its top end, and the upper end of the stroke return spring (53) abuts against the inner wall of the top of the outer housing (1). The stroke switch (52) is electrically connected to the circuit board (7); The negative pressure induction valve (54), the circuit board (7), and the air extraction pump (4) are all installed on the top surface of the inner cavity bottom plate (31). An air pipe interface (321) is provided at the top of the inner cavity upper cover (32) at a position opposite to the one-way pressure maintaining valve (33). The air pipe interface (321), the air extraction pump (4), and the negative pressure induction valve (54) are connected together through a three-way air pipe.

4. The negative pressure adsorption device for a mobile phone according to claim 2, wherein: The suction cup (2) is provided with suction holes (22). The inner cavity bottom plate (31) is provided with air nozzles at positions corresponding to the suction holes (22). The air nozzles pass through the outer housing (1) and are inserted and mated with the suction holes (22). A protrusion (340) is provided at the position between the top of the air nozzle and the one-way pressure maintaining valve (33) on the inner cavity bottom plate (31) to form a three-way air hole (34). The three-way air hole (34) communicates with the outer negative pressure cavity (21), the inner negative pressure cavity, and the one-way pressure maintaining valve (33) respectively.

5. The mobile phone negative pressure adsorption device according to claim 4, characterized in that: The bottom edge of the one-way pressure maintaining valve (33) is stuck between the protrusion (340) and the inner cavity upper cover (32) to fix the one-way pressure maintaining valve (33) at the position between the inner cavity bottom plate (31) and the inner cavity upper cover (32).

6. The negative pressure adsorption device for a mobile phone according to claim 1, characterized in that: The inner cavity assembly (3) further includes an exhaust unit (35). The exhaust unit (35) includes an exhaust return spring (351), an exhaust valve stem (352), and a button (353). The exhaust return spring (351) is fixed in the inner negative pressure cavity. The exhaust valve stem (352) is slidably disposed in the negative pressure inner cavity, and its inner end is inserted into the exhaust return spring (351). A frustum for sealingly abutting against the inner wall of the inner cavity bottom plate (31) is provided in the middle thereof, and its outer end extends out of the inner negative pressure cavity and is connected to the button (353). The button (353) is exposed on the side wall of the outer housing (1).

7. The mobile phone negative pressure adsorption device according to claim 4, characterized in that: A sealing ring (8) is provided at the contact position between the nozzle and the bottom case (14).

8. A mobile phone negative pressure adsorption device according to any one of claims 1 to 7, characterized in that: The outer housing (1) sequentially includes an upper shell cover (111), an upper shell ring (112), a permanent magnet member (12), a middle shell (13), and a bottom case (14) from top to bottom; The top surface of the upper shell cover (111) is used for cooperating with the universal bracket of the mobile phone. A groove is provided on the top surface of the upper shell ring (112). The permanent magnet member (12) is installed in the groove. The suction cup (2) is fixedly installed on the bottom case (14).

9. The mobile phone negative pressure adsorption device according to claim 8, characterized in that: The device further includes a power supply body (61). A mounting plate (62) is fixedly provided on the inner cavity bottom plate (31). The power supply body (61) is installed on the mounting plate (62).

10. The mobile phone negative pressure adsorption device according to claim 9, characterized in that: A wireless charging magnetic ring (64) is provided between the inner cavity bottom plate (31) and the bottom case (14).

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