Mattress with passive air pressure balance function and control method thereof

Abstract

This paper presents a mattress with passive air pressure balance and its control method. The mattress comprises an air bladder mechanism and a control mechanism. The air bladder mechanism includes an air bladder group, an air pump assembly, a multi-port solenoid valve, and pressure sensors. Back, hip, and lower-leg air bladders are separately connected to the solenoid valve and sensors. Waist and popliteal space air bladders are interconnected via air pipes, sharing one solenoid valve port and one pressure sensor. The solenoid valve is connected to the air pump, with partial ports interchangeable. The mattress automatically adjusts support force, improving sleeping comfort and safety.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of mattresses, and in particular, to a mattress with a passive air pressure balance function and a control method thereof.BACKGROUND

[0002] For an air bladder mattress, its firmness is adjusted by inflating and deflating air bladders. By arranging a plurality of groups of air bladders at different positions on the mattress, differentiated supporting for various parts of a human body on the mattress is adjusted. For different user groups, the mattress can automatically adapt to air bladder supporting degrees with different parameters. For different sleeping postures of users, the mattress can dynamically adapt to different supporting forces.

[0003] A conventional air bladder mattress directly inflates and deflates the air bladders in different regions. The supporting forces of the air bladders at different parts are respectively adjusted by inflation and deflation. For users with different body weights, the air bladders for the hips and the waists can adapt to supporting forces by different degrees of deflation and inflation. Moreover, for a user with significant body movements, it is easier to break an original air bladder supporting balance. To achieve a balance again, the air bladders need to be deflated by more air and inflated with more air. It makes an air pump assembly work frequently. This not only shortens the lifespan of the air pump assembly, but also leads to problems such as heating and noise. These problems may possibly affect the sleep quality of the user and cause a poor user experience. Meanwhile, if the air bladders release a large amount of air, a large amount of air needs to be supplemented during next refill. This slows down the adjustment. Therefore, to avoid frequent inflation and deflation, an air volume adjustment range of the existing air bladder mattress is limited, thereby restricting the free adjustment capability of the mattress for the supporting degree.

[0004] In addition, the existing air bladder mattress lacks effective supporting for a side-lying position, particularly a leg-raising posture during side sleeping. The discomfort caused by the unsupported legs during the side sleeping cannot be solved.SUMMARY

[0005] For the defects in the foregoing existing technology, a first objective of the present disclosure is to provide a mattress with a passive air pressure balance function, to solve problems of frequency work of an air pump assembly and the like. A second objective of the present disclosure is to provide a control method for a mattress with a passive air pressure balance function, to solve a problem that a supporting degree of the mattress cannot be freely adjusted in any manner.

[0006] The first objective of the present disclosure is implemented by using the following technical solution:

[0007] A mattress with a passive air pressure balance function includes an air bladder mechanism and a control mechanism. The air bladder mechanism includes an air bladder group, an air pump assembly, a multi-port solenoid valve, and pressure sensors. The air bladder group sequentially includes back air bladders, waist air bladders, hip air bladders, popliteal space air bladders, and lower-leg air bladders. The back air bladders, the hip air bladders, and the lower-leg air bladders are connected to the multi-port solenoid valve and the pressure sensors. The waist air bladders and the popliteal space air bladders are directly communicated with each other through an air pipe and are jointly connected to the multi-port solenoid valve and share one pressure sensor. The multi-port solenoid valve includes an air inlet, an air discharge port, and multi-air bladder connection ports. The air inlet of the multi-port solenoid valve is connected to the air pump assembly. The waist air bladders and the popliteal space air bladders share one multi-air bladder connection port. The hip air bladders are connected to one multi-air bladder connection port. The two multi-air bladder connection ports can be communicated with each other. The pressure sensors are configured to monitor an air pressure value of the air bladder group. The control mechanism is electrically connected to the air pump assembly, the multi-port solenoid valve, and the pressure sensors.

[0008] Further, the air bladder group further includes head air bladders. The head air bladders are disposed above the back air bladders. The head air bladders are connected to the multi-port solenoid valve and one pressure sensor. The air inlet of the multi-port solenoid valve is connected to the air pump assembly.

[0009] Further, the back air bladders, the waist air bladders, the popliteal space air bladders, and the lower-leg air bladders are transversely distributed on the mattress. A plurality of hip air bladders are longitudinally distributed on the mattress.

[0010] Further, each hip air bladder is connected to one multi-air bladder connection port and one pressure sensor. The multi-air bladder connection port connected to each hip air bladder is communicated with the multi-air bladder connection port shared by the waist air bladders and the popliteal space air bladders.

[0011] Further, one or two air bladder groups are included. The air pump assembly includes two parallel air pumps. The air pump assembly is provided with a mechanical pressure relief valve. An exhaust port of the air pump assembly is connected to an inlet muffler. The inlet muffler is disposed between the air pump assembly and the multi-port solenoid valve. An outlet muffler is connected to the air discharge port of the multi-port solenoid valve. The air pump assembly, the inlet muffler, the outlet muffler, and the multi-port solenoid valve are mounted inside a control box.

[0012] Further, the air bladder mattress includes, from top to bottom, a memory foam layer, a fiber batting layer, a foam layer, and a pocket spring layer. The foam layer is provided with an accommodating slot. The air bladder group is disposed within the accommodating slot.

[0013] Further, air bladders of the air bladder group are a plurality of stacked air bladders, including a plurality of air bladder layers connected in sequence vertically. Adjacent air bladder layers are communicated with each other, and an area of a communicated position is smaller than a surface area when the air bladder layers are normally unfolded.

[0014] Further, the air bladder mechanism includes a sleeping position sensor. The sleeping position sensor is disposed above the air bladder group and is configured to detect a sleeping posture of a user.

[0015] The second objective of the present disclosure is implemented by using the following technical solution:

[0016] A control method for the mattress with a passive air pressure balance function includes the following steps:

[0017] S1: an initialization stage: acquiring, by the pressure sensors, initial air pressure values of the air bags in the air bladder group, comparing the initial air pressure values with reference values set by a system or reference values set by a user, inflating and deflating the air bladders based on difference values until the air pressure values reach the reference values, and completing initialized supporting adjustment;

[0018] S2: a supine position recognition stage: monitoring, by the pressure sensors, air pressure changes of the air bladders in real time; when a fluctuation amplitude of any air pressure value exceeds a set threshold relative to the reference value and maintaining time of the state exceeds preset duration, determining that the user has been in a supine position, executing a passive air pressure balance step, and communicating the waist air bladders, the popliteal space air bladders, and the hip air bladders, where under the action of the weight of the user, air pressures within the waist air bladders, the popliteal space air bladders, and the hip air bladders are automatically redistributed, the process only controls opening or closing of the multi-port solenoid valve, and the air pump assembly remains inactive, thus achieving passive pneumatic balance adjustment;

[0019] S3: a body mass index (BMI) adaptation stage: according to a determined user body type BMI setting, detecting the air pressure values of the air bladders for body parts, and precisely inflating or deflating the air bladders through the air pump assembly and the multi-port solenoid valve to quickly adjust the air bladders to target BMI values, to achieve adaptive adjustment that conforms to a body curve;

[0020] S4: an energy saving stage: when the pressure sensors monitor that an air pressure change amplitude is continuously less than the set threshold, determining that the user has entered a stable sleep state and has not turned over significantly, and reducing sampling frequencies of the pressure sensors;

[0021] S5: a sleeping posture change stage: when the fluctuation amplitude of any air pressure value relative to a target air pressure value exceeds the set threshold and the state is maintained stably for preset duration, indicating that the sleeping posture of the user has changed; matching, again by the system, target parameters of the air pressures that are pre-stored, and repeating steps S2 to S4; and

[0022] S6: a get-up stage: when the pressure sensors monitor that the air pressure values suddenly decrease to approach the initial values and are kept decreasing for preset duration, determining that the user has got up, making the system immediately enter an initialized control process, adjusting the air pressure values of the air bladders to the initial air pressure values, and waiting for next activation.

[0023] Further, in step S5, the matrix human biological capacitive sleeping position sensor is used to sense the sleeping posture of the user and determine changes in the sleeping posture of the user.

[0024] Beneficial effects of the present disclosure are as follows:

[0025] (1) The waist air bladders and the popliteal space air bladders are connected in parallel to form one air bladder which is recorded as a waist-leg parallel-connection air bladder. The air inside the waist air bladders and the popliteal space air bladders can freely circulate and reach a balance according to the user's own weight. By controlling opening or closing of the multi-port solenoid valve, it is possible to achieve air circulation between the waist-leg parallel-connection air bladder and the hip air bladders. When the mattress is pressed by a human body, if the hip presses the mattress, the air pressure on the hip increases, and the waist and the popliteal space are suspended. In this case, the multi-air bladder connection port between the waist-leg parallel-connection air bladder and the hip air bladders is opened to form a connector structure between the waist-leg parallel-connection air bladder and the hip air bladders. The pressures inside the hip air bladders are high, and the air inside the hip air bladders will automatically flow towards the waist air bladders and the popliteal space air bladders until a pressure balance is achieved. Then, the communication between the waist-leg parallel-connection air bladder and the hip air bladders is cut off. The pressure balance state in this case is determined by an actual sleeping posture of a user, which is more in line with the body curve. Therefore, when the air pressures inside the air bladders are adjusted subsequently, only fine adjustment is required. The inflation and deflation air volumes are small. The air pump assembly has short working time and a low frequency. This effectively prolongs the service life of the air pump assembly, reduces the noise caused by working of the air pump assembly, and mitigates the impact on the sleep of the user.

[0026] (2) By the arrangement of the popliteal space air bladders to add air pressure adjustment for the popliteal space parts, the problem of suspension of the popliteal space parts in the supine position is solved. By adjusting the popliteal space air bladders and the waist air bladders, the feeling of embracing with two arms is simulated, to restore the comfort and sense of safety of being held by a mother when people were young. By the arrangement of the head air bladders, the height of the head of the user can be adjusted to adapt to changes in the heights of the shoulders when the user is in the supine position and the side-lying position, thus increasing the comfort during sleeping.

[0027] (3) The plurality of hip air bladders are longitudinally distributed. Inflation and deflation of the plurality of hip air bladders are independent of each other. The plurality of hip air bladders can effectively support the legs raised by the user in the side-lying position, thus increasing the comfort and sense of safety during sleeping.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a top view of a foam layer in the present disclosure;

[0029] FIG. 2 is a structural exploded view of the present disclosure;

[0030] FIG. 3 is a schematic structural diagram of a foam layer in the present disclosure;

[0031] FIG. 4 is a schematic structural diagram of an air bladder group in the present disclosure; and

[0032] FIG. 5 is a schematic diagram of a connection relationship of an air bladder mechanism in the present disclosure.

[0033] In the drawings: 1: air bladder mechanism; 11: air bladder group; 111: head air bladder; 112: back air bladder; 113: waist air bladder; 114: hip air bladder; 115: popliteal space air bladder; 116: lower-leg air bladder; 12: air pump assembly; 13: multi-port solenoid valve; 14: sleeping position sensor; 2: memory foam layer; 3: fiber batting layer; 4: foam layer; 5: pocket spring layer; 6: inlet muffler; and 7: control box.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the technical problems to be solved in the present disclosure, the technical solutions, and the beneficial effects clearer, the following is a further explanation of the invention in conjunction with the accompanying drawings and embodiments.Embodiment 1

[0035] As shown in FIG. 1 to FIG. 5, this embodiment provides a mattress with a passive air pressure balance function, including an air bladder mechanism 1 and a control mechanism. The air bladder mechanism 1 includes an air bladder group 11, an air pump assembly 12, a multi-port solenoid valve 13, and pressure sensors. The air bladder group 11 sequentially includes back air bladders 112, waist air bladders 113, hip air bladders 114, popliteal space air bladders 115, and lower-leg air bladders 116. The back air bladders 112, the hip air bladders 114, and the lower-leg air bladders 116 are connected to the multi-port solenoid valve 13 and the pressure sensors. The waist air bladders 113 and the popliteal space air bladders 115 are directly communicated with each other through an air pipe and are jointly connected to the multi-port solenoid valve 13 and share one pressure sensor. The multi-port solenoid valve 13 includes an air inlet, an air discharge port, and multi-air bladder connection ports. The air inlet of the multi-port solenoid valve 13 is connected to the air pump assembly 12. The air pump assembly 12 inflates the air bladders in the air bladder group 11. The waist air bladders 113 and the popliteal space air bladders 115 share one multi-air bladder connection port. The hip air bladders 114 are connected to one multi-air bladder connection port. The two multi-air bladder connection ports can be communicated with each other. The pressure sensors are configured to monitor an air pressure value of the air bladder group 11. The control mechanism is electrically connected to the air pump assembly 12, the multi-port solenoid valve 13, and the pressure sensors.

[0036] The waist air bladders 113 and the popliteal space air bladders 115 are directly communicated with each other to form one air bladder which is recorded as a waist-leg parallel-connection air bladder. The air inside the waist air bladders 113 and the popliteal space air bladders 115 can freely circulate and reach a balance according to the user's own weight. By controlling opening or closing of the multi-port solenoid valve 13, it is possible to achieve air circulation between the waist-leg parallel-connection air bladder and the hip air bladders 114. When the mattress is pressed by a human body, if the hip presses the mattress, the air pressure on the hip increases, and the waist and the popliteal space are suspended. In this case, the multi-air bladder connection port between the waist-leg parallel-connection air bladder and the hip air bladders 114 is opened to communicate the waist-leg parallel-connection air bladder with the hip air bladders 114, thus forming a connector structure between the waist-leg parallel-connection air bladder and the hip air bladders 114. The pressures inside the hip air bladders 114 are high, and the air inside the hip air bladders 114 will automatically flow towards the waist air bladders 113 and the popliteal space air bladders 115 until a pressure balance is achieved. Then, the communication between the waist-leg parallel-connection air bladder and the hip air bladders 114 is cut off. The pressure balance state in this case is determined by an actual sleeping posture of a user, which is more in line with the body curve. Therefore, when the air pressures inside the air bladders are adjusted subsequently, only fine adjustment is required. The inflation and deflation air volumes are small. The air pump assembly 12 has short working time and a low frequency. This effectively prolongs the service life of the air pump assembly 12 and reduces the noise caused by working of the air pump assembly 12.

[0037] By the arrangement of the popliteal space air bladders 115 to add air pressure adjustment for the popliteal space parts, the problem of suspension of the popliteal space parts in the supine position is solved. By adjusting the popliteal space air bladders 115 and the waist air bladders 113, the feeling of embracing with two arms is simulated, to restore the comfort and sense of safety of being held by a mother when people were young.

[0038] The control mechanism senses the air pressures in the air bladders of the mattress through the pressure sensors, determines whether the user has lied down based on the pressure sensors of the air bladders, and monitors the weight of the user. When the user lies on the mattress or changes the sleeping posture, a passive air pressure balance technology is initiated first to automatically balance the air pressures in the waist, hip, and leg air bladders. Then, fine adjustment on the air pressures is performed for different stressed parts such as the shoulders, the waist, the hip, and the legs based on actual air pressure values and a precise weight grading algorithm, so that adaptive adjustment on the firmness of the user mattress, making the mattress more in line with the body curve and adapt to people with different weights.

[0039] In the present disclosure, one multi-port solenoid valve 13 is provided. Vent ports such as a plurality of air inlets, a plurality of air discharge ports, and the multi-air bladder connection ports are concentrated on one multi-port solenoid valve 13. Each channel of the multi-port solenoid valve 13 is independently controlled, is in a normally closed state by default, and can be opened only after the valve is energized. The multi-port solenoid valve 13 is connected to the air pump assembly 12 through an air pipe. By controlling opening and closing of a passage between an air inlet of the multi-port solenoid valve 13 and the air pump assembly 12, the air pump assembly 12 is controlled to inflate any air bladder or a plurality of air bladders. The plurality of vent ports are communicated with each other inside the multi-port solenoid valve 13, and then any air bladder or a plurality of air bladders are deflated through the air discharge ports by controlling opening and closing of the air discharge ports on the multi-port solenoid valve 13. By the foregoing two actions, arbitrary inflation and deflation can be implemented on the air bladders.

[0040] Further, the air bladder group 11 further includes head air bladders 111. The head air bladders 111 are disposed above the back air bladders 112. The head air bladders 111 are connected to the multi-port solenoid valve 13 and one pressure sensor. By adding the head air bladders 111, the height of the head of the user is adjusted to coordinate with the back air bladders 112, thus ensuring adaptability to users with various body types.

[0041] Further, the head air bladders 111, the back air bladders 112, the waist air bladders 113, the popliteal space air bladders 115, and the lower-leg air bladders 116 are all parallel to each other and are transversely distributed on the mattress. A plurality of hip air bladders 114 are longitudinally arranged on the mattress. The plurality of hip air bladders 114 are parallel to each other. The hip air bladders 114 are perpendicular to other air bladders and divide a hip region into a plurality of longitudinal regions. Inflation and deflation of the plurality of hip air bladders 114 are independent of each other, so that the plurality of hip air bladders 114 can effectively support a leg raised when the user is in the side-lying position, thereby enhancing comfort and a sense of safety during sleeping.

[0042] Further, each hip air bladder 114 is connected to one multi-air bladder connection port and one pressure sensor. The multi-air bladder connection port connected to each hip air bladder 114 is communicated with the multi-air bladder connection port shared by the waist air bladders 113 and the popliteal space air bladders 115.

[0043] Further, four hip air bladders 114 are included, and one or two air bladder groups 11 are included. The air pump assembly 12 includes two air pumps connected in parallel. The air pump assembly 12 is provided with a mechanical pressure relief valve. The mechanical pressure relief valve provides emergency pressure relief for the air pumps, to prevent the air bladders from being overpressurized. The two air pumps are designed. During working in an initialization stage, the two air pumps work together to rapidly inflate the air bladders. This stage features a high inflation speed and is sensitive to movements of the air bladders. In a sleeping stage of the user, only one air pump works to inflate the air bladders for fine pressure adjustment, to minimize the noise and avoid disturbing the user's rest.

[0044] An exhaust port of the air pump assembly 12 is connected to an inlet muffler 6. The inlet muffler 6 is disposed between the air pump assembly 12 and the multi-port solenoid valve 13. Compressed air from the air pump assembly 12 is silenced by the inlet muffler 6 and then enters the multi-port solenoid valve 13. The air discharge port of the multi-port solenoid valve 13 is connected to an outlet muffler. Air discharged from the air discharge port is silenced by the outlet muffler. The air pump assembly 12, the inlet muffler 6, the outlet muffler, and the multi-port solenoid valve 13 are all mounted inside a control box 7. A dual noise reduction design implements a silencing function of the mattress.

[0045] Further, the air bladder mattress includes, from top to bottom, a memory foam layer 2, a fiber batting layer 3, a foam layer 4, and a pocket spring layer 5. The foam layer 4 is provided with an accommodating slot. The air bladder group 11 is disposed within the accommodating slot. In addition, the air pump assembly 12, the control mechanism, and the multi-port solenoid valve 13 are all disposed within one control box 7. The control box 7 is also disposed within the foam layer 4 and is located at a foot position of the mattress.

[0046] Further, air bladders of the air bladder group 11 are a plurality of stacked air bladders, including a plurality of air bladder layers connected in sequence vertically. Adjacent air bladder layers are communicated with each other, and an area of a communicated position is smaller than a surface area when the air bladder layers are normally unfolded. The air bladder group 11 can be a double-layer stacked air bladder, a triple-layer stacked air bladder, a quadruple-layer stacked air bladder, or the like. By using the multi-layer stacked air bladder, the height can be increased to enhance the supporting force in an inflation state, and the height can also be decreased to reduce the supporting force in a deflation state, thereby providing a two-dimensional adjustment space.

[0047] Further, the air bladder mechanism 1 includes a sleeping position sensor 14. The sleeping position sensor 14 is disposed above the air bladder group 11 and is located between the memory foam layer 2 and the fiber batting layer 3 to detect a sleeping posture of a user. The sleeping position sensor 14 uses a matrix detection antenna to partition the mattress. By detecting a human biological capacitance in each independent zone, changes in the sleeping posture of the user are determined to provide blocked sleeping posture state information.Embodiment 2

[0048] Based on Embodiment 1, this embodiment provides a control method for the mattress with a passive air pressure balance function, including the following steps:

[0049] S1: an initialization stage: acquiring, by the pressure sensors, initial air pressure values of the air bags in the air bladder group 11, comparing the initial air pressure values with reference values set by a system or reference values set by a user, inflating and deflating the air bladders based on difference values until the air pressure values reach the reference values, completing initialized supporting adjustment, and forming a basic supporting framework to provide a foundation for subsequent perception and adjustment;

[0050] S2: a supine position recognition stage: after the initialization is completed, monitoring, by the pressure sensors, air pressure changes of the air bladders in real time; when a fluctuation amplitude of any air pressure value exceeds a set threshold relative to the reference value and maintaining time of the state exceeds preset duration, determining that the user has been in a supine position; dynamically sampling the pressures of the air bags by catching changes in the pressures of the air bladders; executing a passive air pressure balance step, and communicating the waist air bladders 113, the popliteal space air bladders 115, and the hip air bladders 114, where under the action of the weight of the user, air pressures within the waist air bladders (113), the popliteal space air bladders (115), and the hip air bladders (114) are automatically redistributed, the process only controls opening or closing of the multi-port solenoid valve (13), and the air pump assembly (12) remains inactive, thus achieving passive pneumatic balance adjustment;

[0051] S3: based on target BMI parameters of air pressures of the air bladders that are pre-stored in an automatic matching system for air bladder pressure levels (BMI refers to a body mass index, which is an international common standard for determining fatness or thinness of a human body and whether the human body is healthy, and a core logic of the BMI is to digitalize a relationship between the height and the weight and determine, through a simple formula, whether the weight is within a healthy range; the target BMI parameters herein are calculated based on a digital relationship logic between the height and the weight; the pressures of the air bladders adapt to different air pressure supporting adjustments based on different body types; different pressure levels correspond to different shoulder, back, waist, leg, and hip position supporting air pressure solutions), initiating an adaptive BMI adjustment program; continuously monitoring, by the pressure sensors, air pressure values of the air bladders based on a user body type BMI setting determined by the system; comparing actual air pressure values with target air pressure values; precisely inflating or deflating the air bladders through the air pump assembly 12 and the multi-port solenoid valve 13 to quickly adjust the air bladder group 11 to target BMI values, to achieve adaptive adjustment that conforms to a body curve;

[0052] S4: an energy saving stage: when the pressure sensors monitor that an air pressure change amplitude is continuously less than the set threshold, determining that the user has entered a stable sleep state and has not turned over significantly, and reducing sampling frequencies and data processing strength of the pressure sensors, where the service life of the device is prolonged while ensuring a basic monitoring function and reducing the energy consumption;

[0053] S5: a sleeping posture change stage: when the fluctuation amplitude of any air pressure value relative to a target air pressure value exceeds the set threshold and the state is maintained stably for preset duration, indicating that the sleeping posture of the user has changed; using the matrix human biological capacitive sleeping position sensor 14 to sense and determine the sleeping posture of the user; matching, by the system again, target parameters of the air pressures that are pre-stored, and repeating steps S2 to S4; and

[0054] S6: a get-up stage: when the pressure sensors monitor that the air pressure values suddenly decrease to approach the initial values for preset duration, determining that the user has got up, making the system immediately enter an initialized control process, adjusting the air pressure values of the air bladders to the initial air pressure values, and waiting for next activation.

[0055] In step S1, the two air pumps in the air pump assembly 12 simultaneously work. In step S2 and step S4, only one air pump in the air pump assembly 12 works, to reduce the working noise and avoid disturbing the user's rest.

[0056] In addition, based on multiple dynamically sampled data, the system can learn and memorize a hierarchical adjustment habit of a user for mattress firmness, so that the user can finely adjust the mattress based on a preset firmness level according to the own body feeling.

[0057] The above describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present disclosure shall fall within the protection scope of the present disclosure.

Claims

1. A mattress with a passive air pressure balance function, comprising an air bladder mechanism (1) and a control mechanism, wherein the air bladder mechanism (1) comprises an air bladder group (11), an air pump assembly (12), a multi-port solenoid valve (13), and pressure sensors; the air bladder group (11) sequentially comprises back air bladders (112), waist air bladders (113), hip air bladders (114), popliteal space air bladders (115), and lower-leg air bladders (116); the back air bladders (112), the hip air bladders (114), and the lower-leg air bladders (116) are connected to the multi-port solenoid valve (13) and the pressure sensors; the waist air bladders (113) and the popliteal space air bladders (115) are directly communicated with each other through an air pipe and are jointly connected to the multi-port solenoid valve (13) and share one pressure sensor; the multi-port solenoid valve (13) comprises an air inlet, an air discharge port, and multi-air bladder connection ports; the air inlet of the multi-port solenoid valve (13) is connected to the air pump assembly (12); the waist air bladders (113) and the popliteal space air bladders (115) share one multi-air bladder connection port; the hip air bladders (114) are connected to one multi-air bladder connection port; the two multi-air bladder connection ports are communicated with each other; the pressure sensors are configured to monitor an air pressure value of the air bladder group (11); and the control mechanism is electrically connected to the air pump assembly (12), the multi-port solenoid valve (13), and the pressure sensors.

2. The mattress with the passive air pressure balance function according to claim 1, wherein the air bladder group (11) further comprises head air bladders (111); the head air bladders (111) are disposed above the back air bladders (112); and the head air bladders (111) are connected to the multi-port solenoid valve (13) and one pressure sensor.

3. The mattress with the passive air pressure balance function according to claim 1, wherein the back air bladders (112), the waist air bladders (113), the popliteal space air bladders (115), and the lower-leg air bladders (116) are transversely distributed on the mattress; and a plurality of hip air bladders (114) are longitudinally distributed on the mattress.

4. The mattress with the passive air pressure balance function according to claim 3, wherein each hip air bladder (114) is connected to one multi-air bladder connection port and one pressure sensor; and the multi-air bladder connection port connected to each hip air bladder (114) is communicated with the multi-air bladder connection port shared by the waist air bladders (113) and the popliteal space air bladders (115).

5. The mattress with the passive air pressure balance function according to claim 1, wherein one or two air bladder groups (11) are comprised; the air pump assembly (12) comprises two parallel air pumps; the air pump assembly (12) is provided with a mechanical pressure relief valve; an exhaust port of the air pump assembly (12) is connected to an inlet muffler (6); the inlet muffler (6) is disposed between the air pump assembly (12) and the multi-port solenoid valve (13); an outlet muffler is connected to the air discharge port of the multi-port solenoid valve (13); and the air pump assembly (12), the inlet muffler (6), the outlet muffler, and the multi-port solenoid valve (13) are mounted inside a control box (7).

6. The mattress with the passive air pressure balance function according to claim 1, wherein the air bladder mattress comprises, from top to bottom, a memory foam layer (2), a fiber batting layer (3), a foam layer (4), and a pocket spring layer (5); the foam layer (4) is provided with an accommodating slot; and the air bladder group (11) is disposed within the accommodating slot.

7. The mattress with the passive air pressure balance function according to claim 1, wherein air bladders of the air bladder group (11) are a plurality of stacked air bladders, comprising a plurality of air bladder layers connected in sequence vertically; and adjacent air bladder layers are communicated with each other, and an area of a communicated position is smaller than a surface area when the air bladder layers are normally unfolded.

8. The mattress with the passive air pressure balance function according to claim 1, wherein the air bladder mechanism (1) comprises a sleeping position sensor (14); and the sleeping position sensor (14) is disposed above the air bladder group (11) and is configured to detect a sleeping posture of a user.

9. A control method for the mattress with a passive air pressure balance function according to claim 1, comprising the following steps:S1: an initialization stage: acquiring, by the pressure sensors, initial air pressure values of the air bags in the air bladder group (11), comparing the initial air pressure values with reference values set by a system or reference values set by a user, inflating and deflating the air bladders based on difference values until the air pressure values reach the reference values, and completing initialized supporting adjustment;S2: a supine position recognition stage: monitoring, by the pressure sensors, air pressure changes of the air bladders in real time; when a fluctuation amplitude of any air pressure value exceeds a set threshold relative to the reference value and maintaining time of the state exceeds preset duration, determining that the user has been in a supine position, executing a passive air pressure balance step, and communicating the waist air bladders (113), the popliteal space air bladders (115), and the hip air bladders (114), wherein under the action of the weight of the user, air pressures within the waist air bladders (113), the popliteal space air bladders (115), and the hip air bladders (114) are automatically redistributed, the process only controls opening or closing of the multi-port solenoid valve (13), and the air pump assembly (12) remains inactive;S3: a body mass index (BMI) adaptation stage: according to a determined user body type BMI setting, detecting, by the pressure sensors, the air pressure values of the air bladders for body parts, and precisely inflating or deflating the air bladders through the air pump assembly (12) and the multi-port solenoid valve (13) to adjust the air bladders for the body parts to target BMI values, to achieve adaptive adjustment that conforms to a body curve;S4: an energy saving stage: when the pressure sensors monitor that an air pressure change amplitude is continuously less than the set threshold, determining that the user has entered a stable sleep state and has not turned over significantly, and reducing sampling frequencies of the pressure sensors;S5: a sleeping posture change stage: when the fluctuation amplitude of any air pressure value relative to a target air pressure value exceeds the set threshold and the state is maintained stably for preset duration, indicating that the sleeping posture of the user has changed; matching, again by the system, target parameters of the air pressures that are pre-stored, and repeating steps S2 to S4; andS6: a get-up stage: when the pressure sensors monitor that the air pressure values suddenly decrease to approach the initial values for preset duration, determining that the user has got up, making the system immediately enter an initialized control process, adjusting the air pressure values of the air bladders to the initial air pressure values, and waiting for next activation.

10. The control method for the mattress with the passive air pressure balance function according to claim 9, wherein in step S5, the matrix human biological capacitive sleeping position sensor (14) is used to sense the sleeping posture of the user and determine changes in the sleeping posture of the user.

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