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CN-121993633-A - Cam-driven valve, valve bank and control method thereof

CN121993633ACN 121993633 ACN121993633 ACN 121993633ACN-121993633-A

Abstract

The application belongs to the technical field of automobile seat massage systems, and in particular relates to a cam-driven valve, a valve bank and a control method thereof, wherein the valve comprises a valve bank body, a cam shaft positioned at the outer side of the valve bank body, a motor connected with the cam shaft in a driving way and a valve opening and closing assembly, a gas circulation cavity is formed in the valve bank body, and a gas inlet, a gas charging port and a gas outlet which are communicated with the cavity are arranged in the valve bank body, the valve opening and closing assembly comprises an elastic member, a plug and an elastic sealing piece at the end part of the plug, one end of the elastic member is fixed at the other end of the mounting seat and is connected with the plug, so that the plug is switched between a first position and a second position, the valve group body is provided with a pressing opening, the cam applies pressing displacement to the elastic member through the pressing opening to drive the plug to switch, and the pressing opening is provided with the elastic sealing piece for covering the pressing opening. The application reduces the noise and heat accumulation risk, realizes the multi-air-bag time-sharing or grouping inflation and deflation control, and improves the system integration level and control controllability and the stability under the high-temperature working condition.

Inventors

  • SUN XIANA

Assignees

  • 湖南形致科技有限公司

Dates

Publication Date
20260508
Application Date
20260317

Claims (10)

  1. 1. The cam-driven valve is characterized by comprising a valve block body (3), a cam shaft (1), a motor (2) and a valve opening and closing assembly (4), wherein the valve block body (3) is of a shell structure with a gas circulation cavity formed inside, the valve block body (3) is provided with a gas inlet, a gas charging port and a gas discharging port which are communicated with the cavity, and is provided with a mounting seat for mounting the valve opening and closing assembly (4), the valve opening and closing assembly (4) is arranged at the mounting seat, the valve opening and closing assembly (4) comprises an elastic member, a plug and an elastic sealing piece arranged at the end part of the plug, one end of the elastic member is fixed on the mounting seat, and the other end of the elastic member is connected with the plug; The plug is arranged along the up-down direction, the upper end of the plug is arranged corresponding to the air inlet, and the lower end of the plug is arranged corresponding to the air outlet; the plug is provided with a first position and a second position under the elastic deformation action of the elastic component, wherein in the first position, the upper end of the plug is in sealing fit with the air inlet through the elastic sealing element, and a preset gap is kept between the lower end of the plug and the air outlet; The cam shaft (1) is arranged outside the valve group body (3) and can be rotatably installed, and the cam shaft (1) is provided with a cam which is opposite to the pressing opening, so that the cam can apply pressing displacement to the elastic component through the pressing opening and elastically deform the elastic component in the rotating process of the cam shaft (1), and the plug is driven to switch between the first position and the second position; The motor (2) is in transmission connection with the cam shaft (1) and is used for driving the cam shaft (1) to rotate; The valve group body (3) is provided with an elastic sealing piece at the pressing opening, and the elastic sealing piece covers the pressing opening.
  2. 2. The cam-driven valve according to claim 1, characterized in that the cam, during rotation with the camshaft (1), applies a pressing displacement to the elastic member through the pressing opening in such a way that the cam is in direct contact with the elastic member and applies a pressing displacement, or that the cam is in indirect contact with the elastic member via a force transmission member provided at the pressing opening and applies a pressing displacement.
  3. 3. The cam-driven valve according to claim 2, wherein the cam and the elastic member are in an indirect contact pressing mode, the elastic member is a spring piece (42), one end of the spring piece (42) is fixed at a mounting seat of the valve block body (3), the spring piece (42) is outwards suspended from the fixed end to form a cantilever structure, the free end of the spring piece (42) is connected with the plug, the valve opening and closing assembly (4) further comprises a pressing rod (43), the pressing rod (43) is a force transmission member, one end of the spring piece (42) is provided with a first mounting hole, one end of the pressing rod (43) forms a cylindrical boss and penetrates into the first mounting hole so that the pressing rod (43) and the spring piece (42) can be matched to transmit pressing displacement, and the other end of the pressing rod (43) stretches into the pressing opening; The plug comprises a pin shaft (45) and two rubber plugs (46) arranged at two ends of the pin shaft (45), the elastic component is a spring piece (42), a second mounting hole is formed in the free end of the spring piece (42), two ends of the pin shaft (45) penetrate through and are fixed to the second mounting hole, and the two rubber plugs (46) are respectively arranged corresponding to the air inlet and the air outlet.
  4. 4. The cam-driven valve according to claim 3, wherein the valve block body (3) is of a split type shell structure and comprises a cover plate (30) and a base (31), the cover plate (30) is in buckling connection with the base (31) and surrounds the base to form the cavity, the pressing opening is formed in the cover plate (30), the air inlet and the pressing opening are formed in the cover plate, the air charging opening, the air discharging opening and the mounting seat are formed in the base (31), the air inlet and the air discharging opening are oppositely arranged along the up-down direction of the valve block body (3) and are aligned along an axis, the air charging opening is formed in a lateral position between the air inlet and the air discharging opening, the valve opening and closing assembly (4) further comprises a spring (44), and the inner bottom surface of the base (31) is provided with a spring seat, and the spring (44) is mounted in the spring seat and is respectively abutted against the spring seat and the spring piece (42).
  5. 5. The cam-driven valve according to claim 3, wherein the elastic sealing member at the pressing opening is a sealing film (41), the sealing film (41) is disposed on the top surface of the cover plate (30) and covers the pressing opening, the valve opening and closing assembly (4) further comprises a pressing plate (40) disposed on the outer surface of the sealing film (41), the pressing plate (40) is a force transmission member, at least one U-shaped groove penetrating the thickness of the pressing plate (40) is formed in the pressing plate (40) along the length direction, so that an elastic tongue piece integrally connected with the main body of the pressing plate (40) is formed on the pressing plate (40), and the free end of the elastic tongue piece forms a pressing action surface and is disposed opposite to the cam.
  6. 6. The cam-driven valve according to claim 4, wherein the elastic sealing member at the pressing opening is an elastic pressing block (50), the elastic pressing block (50) comprises a top cover and a plunger arranged at the bottom of the top cover and extending downwards, the top cover covers the pressing opening, the plunger stretches into the lower portion of the pressing opening, an annular groove (500) is formed in the bottom surface of the top cover on the outer side of the circumference of the plunger, the outer edge diameter of the annular groove (500) is larger than the opening size of the pressing opening, so that at least one part of the annular groove (500) falls into the opening range of the pressing opening, a protruding portion is arranged on the inner side of the bottom edge of the top cover, a concave-embedded groove matched with the protruding portion is formed in the upper surface of the cover plate (30), the bottom of the plunger abuts against the top of the pressing rod (43), and the cam drives the plunger to move downwards and the pressing rod (43) to move downwards when pressing the top cover.
  7. 7. The cam-driven valve according to claim 2, wherein the cam and the elastic member are in a direct contact pressing mode, the elastic sealing element is of a soft and hard composite nested structure, the soft and hard composite nested structure comprises a soft and hard material placing plate (47), an injection molding soft material (48) and a hard material (49), a through opening is formed in the soft and hard material placing plate (47), the injection molding soft material (48) is arranged in the through opening, a through hole is formed in the injection molding soft material (48), and the hard material (49) is embedded in the through hole; The elastic member is a spring piece (42), a through hole for the spring piece (42) to penetrate is formed in the hard material (49), the spring piece (42) penetrates into the through hole along the length direction of the spring piece, one end of the spring piece (42) extends to the outer side of the valve group body (3) and is directly matched with the cam, a second mounting hole is formed in the other end of the spring piece (42), a pin shaft (45) penetrates through and is fixed to the second mounting hole, the plug comprises the pin shaft (45) and rubber plugs (46) which are respectively arranged at two ends of the pin shaft (45), and the rubber plugs (46) form an elastic sealing piece at the end part of the plug.
  8. 8. The cam-driven valve according to claim 7, wherein the valve opening and closing assembly (4) further comprises a spring (44), the exhaust port forms a boss structure, the spring (44) is sleeved on the outer side or the circumferential outer wall of the boss structure along the elastic expansion direction of the spring, and is abutted against the spring piece (42), the valve block body (3) comprises a cover plate (30) and a base (31), the air inlet is arranged on the cover plate (30), the exhaust port is arranged on the base (31), and the air inlet and the exhaust port are arranged opposite to each other along the up-down direction.
  9. 9. A valve block of cam-driven valves according to any one of claims 1 to 8, comprising a camshaft (1) and a plurality of groups of valve passages driven by the camshaft (1), wherein the camshaft (1) is provided with a plurality of cams at intervals in the axial direction, the cam positions of the cams in the circumferential direction are different from each other, a plurality of mounting seats which are arranged independently of each other are provided in the valve block body (3), each of the mounting seats is provided with a group of valve opening and closing assemblies (4) and respectively forms an air inlet, an air charging opening and an air discharging opening which are communicated with the internal cavity of the valve block body (3) so as to form a plurality of groups of mutually parallel valve passages, and each of the cams is respectively arranged opposite to the pressing openings at the corresponding mounting seats so that when the camshaft (1) rotates, each of the cams applies pressing or releases pressing to the valve opening and closing assemblies (4) of the corresponding valve passages according to the corresponding protruding positions.
  10. 10. The control method of the valve bank driven by the cam is characterized in that the valve bank comprises a motor, a cam shaft driven by the motor to rotate and at least two groups of valve channels arranged in the valve bank body, each group of valve channels is provided with an air inlet communicated with an air source, an air charging port communicated with a corresponding air bag, an air outlet communicated with the atmosphere and a valve opening and closing assembly, and the cam shaft is axially provided with a plurality of cams and corresponds to the valve opening and closing assemblies of each group of valve channels respectively; The control method comprises the following steps: Step 1, determining a non-pressing angle interval and a pressing angle interval of a cam shaft through calibration, and establishing a mapping relation of the pressing angle intervals of the cams corresponding to all valve channels; Step 2, obtaining control parameters of a target air bag, establishing a corresponding relation between the target air bag and a valve channel, determining at least one target valve channel according to the corresponding relation, and determining a pressing angle interval corresponding to the target valve channel; Step 3, controlling a motor to drive a cam shaft to rotate according to a preset rotation angle and a preset rotation speed, so that each valve channel is switched between a first state and a second state in a pressing angle interval of a corresponding cam; Step 4, when the cam shaft is positioned in a non-pressing angle interval, the valve opening and closing component of the target valve channel is in a first state under the action of reset force; When the target air bag is inflated, controlling a motor to drive a cam shaft to rotate to enter a pressing angle interval corresponding to a target valve channel, enabling the cam of the target valve channel to apply pressing displacement to a valve opening and closing assembly through a pressing opening, driving an elastic member to deflect, driving a plug to release sealing of an air inlet and form sealing with an air outlet, enabling the target valve channel to be switched to a second state, and enabling an air supply source to supply air to the target air bag through the air inlet and an air charging opening; step 6, when the inflation termination condition of the control parameter is met, controlling the motor to enable the cam shaft to be kept at a preset angle position in a pressing angle interval corresponding to the target valve channel and keep a preset time length; And 7, when the target air bag is deflated, controlling the motor to drive the cam shaft to rotate to leave a pressing angle interval corresponding to the target valve channel and enter a non-pressing angle interval, releasing the pressing displacement, enabling the elastic member to rebound and driving the plug to be in sealing fit with the air inlet again, simultaneously enabling the air outlet to be communicated, and enabling the target air bag to be exhausted through the air charging port and the air outlet.

Description

Cam-driven valve, valve bank and control method thereof Technical Field The application belongs to the technical field of automobile seat massage systems, and particularly relates to a cam-driven valve, a cam-driven valve bank and a control method of the cam-driven valve. Background With the improvement of comfort and intelligent level of the automobile seat, the seat pneumatic massage system is widely applied. The system controls the inflation and deflation of a plurality of massage air bags through an air pump, an air circuit pipeline and an air distribution valve group, thereby realizing massage modes such as pressing, wave, circulation and the like. In the existing pneumatic massage system, the gas distribution valve group is composed of a plurality of two-position three-way valves controlled by electromagnetic valves, so that the selective inflation and exhaust control of different air bags is realized. Taking an automobile seat as an example of a 10-point massage 4-flank supporting structure, the massage air bag usually needs 14 two-position three-way valves for control, and the number of electromagnetic valves of the whole system often reaches 14 or more. In the scheme, each electromagnetic valve generally needs a relatively independent driving and power supply control channel, so that the number of control wiring harnesses, driving devices and control interfaces is obviously increased, and the whole system has the problems of high cost, heavy weight, high structure and control complexity and the like. In addition, electromagnetic iron core's actuation and release can produce the impact in the operation in-process of solenoid valve, easily form comparatively obvious operational noise, are unfavorable for the cabin to silence and promote. For partial micro electromagnet structure, because the magnetic attraction force is limited by volume and power consumption, the driving capability is limited, and the sealing and switching reliability of the controlled air valve can be limited, so that the maximum working air pressure upper limit bearable by the valve body is not high, and the suitability of working conditions such as high pressure or rapid inflation is insufficient. Particularly, in some use situations where continuous inflation is required or pressure is maintained for a long time, for example, when driving vigorously, the flanking air bags are in a continuous inflation state, and the electromagnet may be in a long-time power-on state, so that heat accumulation and overheat risks are brought, and adverse effects are caused on safety and service life. Meanwhile, the electromagnetic valve is generally integrated and arranged in a relatively closed cavity in the seat framework and the foam cladding structure, surrounding air convection is limited, a heat conduction and radiation heat dissipation path is blocked by soft materials of the seat, heat resistance of the coil and the valve body is increased, heat dissipation conditions are poor, and temperature rise accumulation and overheat failure risk induction are more easy to occur during long-time continuous action. The prior art has gas valve schemes that employ a memory alloy (SMA) material for actuation. Compared with an electromagnetic valve, the scheme has lower noise in action, but the working mechanism of the scheme generally depends on heating-induced phase change driving and cooling recovery deformation. Meanwhile, the SMA driving air valve is generally integrated and arranged in a relatively closed cavity formed by the seat framework and the foam cladding structure, and air convection heat exchange in the cavity is limited, and a heat dissipation channel is insufficient, so that waste heat of the SMA element after heating and driving is difficult to release in time, and the cooling recovery process is prolonged. The memory alloy is limited by the temperature condition and the thermal management capability of the memory alloy for cooling recovery, the recovery performance of the memory alloy is reduced at a higher ambient temperature, when the ambient temperature reaches or exceeds a certain threshold value, the problem that normal recovery is impossible or the response is slow can occur, the working frequency of the valve is obviously reduced, and the applicability of the SMA driving valve is limited in application scenes such as automobiles and the like with high-temperature cabin environment or hot-dip working conditions. Meanwhile, in both the electromagnetic valve scheme and the SMA drive valve scheme, relatively independent current and power control and drive management are generally required for each air valve, so that the complexity and development cost of software and hardware of a control system are further increased, and the integration and the light weight of the system are not facilitated. Therefore, there is a need for a gas distribution valve set and a control scheme thereof that can reduce the number of solenoid valve sets or