A car lumbar support pressure-maintaining solenoid valve with pressure relief

Abstract

The present invention relates to the technical field of automobile lumbar support solenoid valves, and discloses an automobile lumbar support pressure-maintaining solenoid valve with pressure relief, comprising: a valve body, an axial air duct is provided on the valve body, an air inlet end of the axial air duct is provided with an air inlet connected to an air source, a crater connected to the air inlet end of the valve body is provided in the middle, and a pressure relief port is provided at the end. This solution aims at the problem that caustic soda cotton at the pressure relief port of the automobile lumbar support pressure-maintaining solenoid valve is easily clogged by impurities brought out by high-speed airflow, and replaces the traditional caustic soda cotton with a metal silencer. The whistling noise during the pressure relief process is reduced by opening air holes in the silencer, and at the same time, a push rod is added to the steel ball. The push rod pushes the guide head to reciprocate as the steel ball moves during the pressure relief process, thereby driving the silencer to spin in a linkage manner. During the spinning process, the push rod can cooperate with a scraper to brush off the blockage in the air hole, thereby achieving the function of self-cleaning the air hole, eliminating the safety hazard caused by the blockage of the pressure relief port, and ensuring the safety and reliability of the automobile lumbar support air bag pressure system.

Description

Technical Field

[0001] The invention relates to the technical field of automobile lumbar support solenoid valves, in particular to an automobile lumbar support pressure-maintaining solenoid valve with pressure relief function. Background Art

[0002] A seat lumbar support refers to a support system that is installed on the back of a car seat and has a movable support cushion installed at the waist position. The support cushion can be adjusted forward and backward, up and down to cater to and support the driver's waist curve. The lumbar support system can effectively reduce the driver's waist fatigue and relieve people's waist fatigue caused by long-distance driving or riding. Common lumbar support systems are mechanical and pneumatic. The current pneumatic lumbar support system uses a solenoid valve to control the inflation and deflation of the air bag, so the solenoid valve must simultaneously meet the air bag's inflation, pressure maintenance and deflation functions.

[0003] In the prior art, in order to prevent the pressure inside the airway of the lumbar support pressure-maintaining solenoid valve from exceeding the set pressure value when inflating the air bag, a pressure relief piece is usually provided for the solenoid valve. During the pressure relief process, the airflow velocity is high due to the pressure factor, and a whistling noise is generated when passing through the pressure relief hole. The conventional method is to plug the pressure relief hole with silencer cotton, just like the deflation piece.

[0004] However, in actual application, due to the high air flow velocity of the pressure relief port, impurities generated by component wear and metal expansion inside the solenoid valve are easily brought into the pressure relief port, causing the silencer cotton at the pressure relief port to become blocked, posing a safety hazard. Therefore, in order to ensure the stability of the solenoid valve during pressure relief, a car lumbar support pressure-maintaining solenoid valve with pressure relief is urgently needed to solve the above problem.

[0005] At the same time, application number 201910325003.5 discloses a pneumatically adjustable lumbar support solenoid valve for a car seat, in which the disclosed metal inflation valve core and metal exhaust valve core are both moving iron cores, both of which are prone to wear after long-term use and have the risk of air leakage. Summary of the Invention

[0006] The object of the present invention is to provide a car lumbar support pressure-maintaining solenoid valve with pressure relief, aiming to solve the problem that the pressure relief component of the existing lumbar support pressure-maintaining solenoid valve is easily blocked.

[0007] The present invention is implemented as follows: a car lumbar support pressure-maintaining solenoid valve with pressure relief, comprising:

[0008] The valve body is provided with an axial air channel, the air inlet end of the axial air channel is provided with an air inlet connected to the air source, the middle part is provided with a volcanic crater connected to the air inlet end of the valve body, the end is provided with a pressure relief port, and the air outlet end of the valve body is also connected to the air nozzle and the air release port respectively;

[0009] Two sets of independently arranged electromagnetic drive components are respectively arranged on the communication paths of the crater, the gas nozzle and the gas vent, and are used to selectively conduct the gas nozzle or the gas vent. The two sets of electromagnetic drive components each have an independently movable moving iron core, and a static iron core is arranged between the two moving iron cores;

[0010] A pressure relief assembly comprising:

[0011] The sealing mechanism is composed of a fastening knob threadedly connected to the pressure relief port, a spring axially compressed by the fastening knob, and a steel ball preloaded by the spring to close the pressure relief port;

[0012] The self-cleaning mechanism includes a cleaning guide tube fixed to the inner wall of the pressure relief port, and the end surfaces of the cleaning tube are respectively provided with annularly distributed cleaning members;

[0013] It also includes a silencer mechanism disposed in the pressure relief assembly, and the silencer mechanism is used for silencing noise during pressure relief.

[0014] Preferably, the silencer mechanism includes a silencer plate, a driving ring is provided in the middle of the silencer plate, an inner wall of the driving ring is provided with axial guide grooves and spiral guide grooves which are alternately distributed, and the steel ball is provided with a guide head through a push rod. When the pressure relief airflow pushes the steel ball to overcome the spring force, the guide head moves along the spiral guide groove and drives the silencer plate to rotate and self-clean, and returns to its original position along the axial guide groove when the spring is reset;

[0015] The end of the axial guide groove is connected to the end of the adjacent spiral guide groove, and the spiral guide groove is inclined away from the rotation direction of the muffler plate;

[0016] The connecting portion between the axial guide groove and the spiral guide groove is further connected with a guide piece via a spring shaft. The end of the guide piece contacts the inner wall of the axial guide groove by default and is arranged in parallel with the spiral guide groove.

[0017] Preferably, the silencer piece is connected between the fastening knob and the end of the cleaning guide tube by a snap buckle, and a compensation rubber ring is provided between the silencer piece and the end of the cleaning guide tube.

[0018] Preferably, the silencer is provided with a slide groove at a position corresponding to the buckle, and the buckle is inlaid with a guide bead that slides inside the slide groove.

[0019] Preferably, the silencer sheet is a metal sheet with a plurality of pores evenly distributed thereon.

[0020] Preferably, the push rod passes through the middle of the silencer plate, the end of the push rod is fixed with a connecting block by a bolt, and the guide head and the connecting block are formed in one piece.

[0021] Preferably, the cleaning member is a rubber strip and a scraping brush, and the cleaning guide tube is provided with a debris removal channel at the cleaning member, and the debris removal channel penetrates and extends to the outside of the cleaning guide tube.

[0022] Preferably, the silencing mechanism includes a silencing chamber opened at the end of the pressure relief port, and the silencing chamber is filled with caustic soda cotton.

[0023] Preferably, the pressure relief method of the automobile lumbar support pressure-maintaining solenoid valve with pressure relief comprises the following steps:

[0024] S1. When inflating the lumbar support airbag, the electromagnetic drive assembly opens the crater channel of the valve body. The steel ball is preloaded by the spring to seal the pressure relief port. External air flows through the air inlet along the axial airway into the crater channel and inflates the lumbar support airbag in a directional manner through the air nozzle.

[0025] S2. When the system pressure exceeds the preset threshold, the high-pressure airflow overcomes the spring resistance and pushes the steel ball away from the pressure relief port, opening the pressure relief channel. The airflow is discharged outward through the pores of the silencer, and the porous damping structure of the silencer suppresses the airflow whistling.

[0026] During the pressure relief process, the axial displacement of the steel ball drives the push rod to move synchronously, driving the guide head to slide along the spiral guide groove on the inner wall of the drive ring, forcing the silencer to rotate around the axis. During the rotation, the scraping brush embedded in the cleaning guide cylinder forms dynamic friction with the surface of the silencer, removing the particles and impurities trapped in the pores;

[0027] S4. After the pressure relief is completed, the spring force pushes the steel ball to return to the closed pressure relief port, and the push rod slides back to its original position along the axial guide groove of the drive ring through the guide head to ensure the accuracy of structural reset.

[0028] The present invention discloses a car lumbar support pressure-maintaining solenoid valve with pressure relief, which has the following beneficial effects:

[0029] 1. This method addresses the problem that the caustic soda cotton at the pressure relief port of the automobile lumbar support pressure-maintaining solenoid valve is easily clogged by impurities carried out by high-speed airflow. The traditional caustic soda cotton is replaced with a metal silencer. The air holes in the silencer are opened to reduce the whistling noise during the pressure relief process. At the same time, a push rod is added to the steel ball. The push rod pushes the guide head back and forth as the steel ball moves during the pressure relief process, thereby driving the silencer to spin. During the spinning process, the push rod can cooperate with the scraper to brush away the blockage in the air hole, achieving the function of self-cleaning the air hole, eliminating the safety hazards caused by the blockage of the pressure relief port, and ensuring the safety and reliability of the automobile lumbar support airbag pressure system;

[0030] 2. By setting up an independent static iron core and two moving iron cores, the valve inflation valve and the pressure maintaining valve share a static iron core. Since the static iron core is inactive during the inflation and deflation process, wear can be avoided. Compared with the traditional opening and closing method of two moving iron cores, the risk of assembly leakage is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a car lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0032] Figure 2 This is a car waist support pressure maintaining solenoid valve with pressure relief provided by the embodiment of the present invention Figure 1 Schematic diagram of the cross-section structure along the AA arrow direction;

[0033] Figure 3 This is a schematic diagram from another perspective of a vehicle lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0034] Figure 4 This is a partial internal structural diagram of a vehicle lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the exploded structure of a pressure relief component of a car lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0036] Figure 6 This is a car waist support pressure maintaining solenoid valve with pressure relief provided by the embodiment of the present invention Figure 5 A magnified schematic diagram of the structure at point B in FIG.

[0037] Figure 7 This is a schematic diagram of the guide structure of a vehicle lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram from another perspective of the exploded structure of a pressure relief component of a pressure-retaining solenoid valve for a lumbar support of an automobile with pressure relief provided by an embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of the flow direction of the impurity discharge channel of a cleaning guide cylinder of a car lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention;

[0040] Figure 10 The present invention is a schematic diagram of a structure of a silencer plate and a drive ring of a vehicle lumbar support pressure-maintaining solenoid valve with pressure relief provided by an embodiment of the present invention.

[0041] Legend:

[0042] 1. Valve body; 2. Air nozzle; 3. Axial air channel; 4. Pressure relief assembly; 5. Air vent;

[0043] 31. Air inlet; 32. Pressure relief vent; 33. Crater;

[0044] 41. Tightening knob; 42. Cleaning guide; 43. Silencer; 44. Steel ball; 45. Spring; 46. Connecting block;

[0045] 411, buckle;

[0046] 421, debris removal channel; 422, rubber strip; 423, scraper;

[0047] 431, air hole; 432, drive ring; 433, axial guide groove; 434, spiral guide groove; 435, guide plate; 436, compensation rubber ring;

[0048] 441, ejector rod;

[0049] 461. Guide head. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] The same or similar numbers in the figures of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the figure, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the figure are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0053] This solution aims to solve the problem that in actual application, due to the high air flow velocity at the pressure relief port of the automobile lumbar support pressure-maintaining solenoid valve, impurities generated by component wear and metal expansion inside the solenoid valve are easily brought into the pressure relief port, causing blockage of the caustic soda cotton at the pressure relief port. In a humid air environment, the caustic soda cotton is also likely to absorb water and expand, blocking the pressure relief, posing a safety hazard.

[0054] Example 1: In this embodiment:

[0055] Reference Figure 1-Figure 3 As shown, a preferred embodiment of the present invention is provided.

[0056] The present embodiment provides a vehicle lumbar support pressure-maintaining solenoid valve with pressure relief, comprising:

[0057] The valve body 1 is provided with an axial air channel 3. The air inlet end of the axial air channel 3 is provided with an air inlet 31 connected to the air source. A volcanic crater 33 connected to the air inlet end of the valve body 1 is provided in the middle (the volcanic crater 33 is a passage opening connecting the axial air channel 3 and the valve body 1). A pressure relief port 32 is provided at the end. The air outlet end of the valve body 1 is also connected to the air nozzle 2 and the air release port 5 respectively.

[0058] Two independently arranged electromagnetic drive components are respectively arranged on the communication path between the crater 33, the air nozzle 2 and the air vent 5, and are used to selectively conduct the air nozzle 2 or the air vent 5; the two sets of electromagnetic drive components each include an independently arranged pin pin for powering the coils within the electromagnetic drive components, thereby generating electromagnetic force to drive the two sets of moving iron cores and a set of static iron cores arranged between the two electromagnetic drive components to independently perform clutch movement, thereby using the rubber pad to complete the opening and closing operation of the air path;

[0059] Among them, electromagnetic valve springs are respectively arranged between the two groups of moving iron cores and the static iron core, which are used to keep the moving iron core away from the static iron core and block the air path when the electromagnetic drive component is powered off. The two groups of electromagnetic drive components respectively have independently movable moving iron cores, and a static iron core is arranged between the two moving iron cores. The inflation valve and the pressure-maintaining valve of the solenoid valve share one static iron core, which avoids the risk of air leakage when the inflation valve and the pressure-maintaining valve are assembled. The two groups of electromagnetic drive components respectively have independently movable moving iron cores, and a static iron core is arranged between the two moving iron cores. Through the cooperation of the static iron core and the two moving iron cores, since the static iron core is inactive during the inflation and deflation processes, wear can be avoided. Compared with the traditional opening and closing method of the two moving iron cores, the risk of assembly leakage is greatly reduced.

[0060] When the air path is pressurized, the upper and lower electromagnetic drive components are not energized, and the airflow enters the lower electromagnetic drive component of the valve body 1 from the air nozzle 2 and is blocked, forming a normally closed effect as a whole;

[0061] In the inflation mode, the upper electromagnetic drive assembly is energized to open the volcano 33, and air flows from the air inlet 31 of the axial airway 3 into the volcano 33, turns to the air nozzle 2 and enters the car waist support airbag. The pressure relief assembly 4 remains sealed until the system is over-pressurized;

[0062] In the deflation mode, the upper electromagnetic drive assembly is de-energized and sealed, while the lower electromagnetic drive assembly is energized and opened. Air flows from the air nozzle 2 into the valve body 1 and passes through the lower electromagnetic drive assembly into the deflation port 5, and is discharged from the deflation port 5.

[0063] During the pressure relief process, the steel ball 44 is blocked by the spring force against the pressure relief port 32 and maintains the internal pressure of the airway. When the internal pressure of the airway exceeds the set pressure value, the system becomes over-pressurized and the steel ball 44 is pushed away from the pressure relief port 32 to open it. After the air enters the pressure relief port 32, it flows out to the outside through the air holes 431 of the silencer 43.

[0064] Figure 4-Figure 7 In the invention, a car waist support pressure-maintaining solenoid valve with pressure relief further comprises a pressure relief component 4, which has: a sealing mechanism, a self-cleaning mechanism and a muffler mechanism;

[0065] The sealing mechanism comprises a tightening knob 41 threadedly connected to the pressure relief port 32, a spring 45 axially compressed by the tightening knob 41, and a steel ball 44 preloaded by the spring to seal the pressure relief port 32. As the tightening knob 41 is tightened toward the pressure relief port 32, the spring 45 is squeezed against the steel ball 44 to seal the pressure relief port 32. Furthermore, the preload force of the steel ball 44 on the pressure relief port 32 increases as the tightening knob 41 is screwed deeper into the pressure relief port 32.

[0066] exist Figure 5 and Figure 9 In the embodiment, the self-cleaning mechanism includes a cleaning guide tube 42 fixed to the inner wall of the pressure relief port 32. The end of the cleaning guide tube 42 is arranged in a semicircular shape, and the end surface thereof is provided with an annularly distributed cleaning member.

[0067] The cleaning member is a rubber strip 422 and a scraper 423. The cleaning guide tube 42 is provided with an impurity discharge channel 421 at the cleaning member. The impurity discharge channel 421 penetrates and extends to the outside of the cleaning guide tube 42 to prevent impurities from clogging the pressure relief airway.

[0068] The role of the rubber strip 422 is to seal the impurity discharge channel 421 to prevent the air flow from escaping from the impurity discharge channel 421 during the pressure relief process.

[0069] exist Figure 7 In general, the airflow during the pressure relief process will be discharged through the air holes 431 of the portion of the silencer 43 that is not in contact with the cleaning guide tube 42. The function of the scraping brush 423 is to scrape off impurities on the surface of the silencer 43 that is screwed into the impurity discharge channel 421 at the end of the cleaning guide tube 42. A number of air holes 431 are evenly distributed on the brush, so that impurities that clog the air holes 431 on the surface of the silencer 43 can be brushed off to avoid clogging.

[0070] It is worth noting that the silencer 43 is a metal sheet, which reduces wear and tear while effectively preventing the caustic soda cotton from swelling due to moisture and blocking the airway.

[0071] exist Figure 6 In the embodiment, the silencer mechanism includes a silencer plate 43, a driving ring 432 is provided in the middle of the silencer plate 43, and the inner wall of the driving ring 432 is provided with axial guide grooves 433 and spiral guide grooves 434 that are alternately distributed. The steel ball 44 is provided with a guide head 461 through a push rod 441. When the pressure relief airflow pushes the steel ball 44 to overcome the spring force, the guide head 461 moves along the spiral guide groove 434 and drives the silencer plate 43 to rotate and self-clean, and returns to its original position along the axial guide groove 433 when the spring 45 is reset.

[0072] Among them, Figure 10In the figure, the end of the axial guide groove 433 is connected to the end of the adjacent spiral guide groove 434, and the spiral guide groove 434 is inclined away from the rotation direction of the silencer 43; since the moving direction of the guide head 461 is parallel to the axial direction of the silencer 43, when the guide head 461 moves in the spiral guide groove 434, the silencer 43 will be pushed to rotate, and after the guide head 461 moves out of the outside of the drive ring 432, it is reset under the action of the spring 45. The end of the axial guide groove 433 is chamfered to make the guide head 461 enter the axial guide groove 433 more smoothly when it is reset.

[0073] Furthermore, the connection between the axial guide groove 433 and its spiral guide groove 434 is also connected to a guide piece 435 via a spring shaft. The end of the guide piece 435 is in contact with the inner wall of the axial guide groove 433 by default and is arranged parallel to the spiral guide groove 434. When the guide head 461 is reset, the guide head 461 will push the guide piece 435 open until the guide head 461 is separated from the axial guide groove 433, and the guide piece 435 will be closed again due to the action of the spring shaft. At this time, the guide head 461 will enter the connection between the axial guide groove 433 and the spiral guide groove 434 and will only be pushed into the spiral guide groove 434 by the guide piece 435, and will not reciprocate inside the axial guide groove 433, thereby avoiding the situation where the silencer piece 43 does not rotate with the movement of the guide head 461.

[0074] It is worth noting that in Figure 7 In the figure, the push rod 441 passes through the middle of the silencer 43, and the end of the push rod 441 is fixed with a connecting block 46 by a bolt. The guide head 461 is formed integrally with the connecting block 46. During the disassembly and replacement of the silencer 43, it is only necessary to unscrew the bolts and remove the connecting block 46 to remove the silencer 43 from the end of the push rod 441.

[0075] In this embodiment, the silencer 43 is connected between the fastening knob 41 and the end of the cleaning guide tube 42 through a buckle 411, and a compensation rubber ring 436 is provided between the silencer 43 and the end of the cleaning guide tube 42. The compensation rubber ring 436 can seal the gap between the cleaning guide tube 42 and the silencer 43 to prevent the airflow from escaping with impurities and at the same time avoid friction between the cleaning guide tube 42 and the silencer 43.

[0076] The silencer 43 is provided with a slide groove at the position corresponding to the buckle 411, and the buckle 411 is inlaid with a guide bead that slides inside the slide groove. When the packaging buckle 411 presses the silencer 43, the friction between the buckle 411 and the silencer 43 is reduced to prevent the silencer 43 from loosening due to wear.

[0077] Aiming at the problem that the caustic soda cotton at the pressure relief port 32 of the automobile lumbar support pressure-maintaining solenoid valve is easily clogged by impurities brought out by high-speed airflow, the traditional caustic soda cotton is replaced with a metal silencer 43. By using the metal silencer 43 with air holes 431 to replace the caustic soda cotton, the whistling noise during the pressure relief process is effectively reduced, and the hidden danger of clogging caused by the expansion of the material due to moisture is completely solved. At the same time, a push rod 441 is added to the steel ball 44. The push rod 441 pushes the guide head 461 to form a reciprocating motion as the steel ball 44 moves during the pressure relief process to drive the silencer in a linked manner. The sheet 43 spins, and during the spinning process, it can cooperate with the scraper 423 to brush away the blockage in the air hole 431, thereby achieving the function of self-cleaning the air hole 431, eliminating the safety hazard caused by the blockage of the pressure relief port 32. This design has achieved a breakthrough in the real-time removal of blockages in the air hole 431, significantly improving the smoothness of the pressure relief channel. At the same time, through the weather resistance advantage of the metal material, it ensures the stable operation of the system under all-weather working conditions, fundamentally guaranteeing the safety and long-term reliability of the automobile lumbar support airbag pressure regulation system.

[0078] This embodiment also includes a pressure relief method for a car lumbar support pressure-maintaining solenoid valve with pressure relief, comprising the following steps: when inflating the car lumbar support airbag, the electromagnetic drive component opens the volcano 33 channel of the valve body 1, and the steel ball 44 is sealed with the pre-tightening force of the spring to seal the pressure relief port 32, and the external airflow enters the volcano 33 along the axial airway 3 through the air inlet 31, and inflates the lumbar support airbag in a direction through the air nozzle 2; when the system pressure exceeds the preset threshold, the high-pressure airflow overcomes the resistance of the spring 45 to push the steel ball 44 away from the pressure relief port 32, opening the pressure relief channel, and the airflow is discharged outward through the air holes 431 of the silencer 43 and passes through the porous structure of the silencer 43. The damping structure suppresses airflow whistling. During the pressure relief process, the axial displacement of the steel ball 44 drives the push rod 441 to move synchronously, driving the guide head 461 to slide along the spiral guide groove 434 on the inner wall of the drive ring 432, forcing the silencer plate 43 to rotate about its axis. During this rotation, the scraper 423 embedded in the cleaning guide cylinder 42 forms dynamic friction with the surface of the silencer plate 43, peeling off and removing particulate impurities trapped in the air hole 431. After the pressure relief is completed, the spring force pushes the steel ball 44 to return to the original position and close the pressure relief port 32. The push rod 441 slides back to its original position along the axial guide groove 433 of the drive ring 432 through the guide head 461, ensuring the accuracy of the structural reset.

[0079] This method forms a closed-loop control of the pressure dynamic balance mechanism and self-sustaining cleaning ability through the forced linkage of pressure relief action and self-spin cleaning, significantly improving the pressure relief efficiency and pore anti-fouling performance, and ensuring the stable pressure relief function of the system throughout its life cycle.

[0080] The second embodiment is different from the first embodiment in that the silencing mechanism includes a silencing cavity opened at the end of the pressure relief port 32, and the silencing cavity is filled with caustic soda cotton.

[0081] Caustic soda cotton has stronger acid and alkali resistance and better tolerance to corrosive media such as oil, chemical solvents, etc. It is suitable for airflow environments containing oil or chemicals and can prevent material failure due to corrosion;

[0082] The caustic soda cotton is not easy to melt or deform in high temperature and high pressure airflow, maintaining a stable porous structure and sound-absorbing performance;

[0083] The fibers of caustic soda cotton are more tightly interwoven and have certain mechanical strength and resistance to airflow erosion, which can reduce the problems of fiber shedding or structural collapse caused by airflow impact during long-term use.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention will be understood according to the specific circumstances. In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions 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 an appropriate manner in any one or more embodiments or examples.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A car lumbar support pressure-maintaining solenoid valve with pressure relief, characterized in that: include: The valve body (1) is provided with an axial air passage (3), the air inlet end of the axial air passage (3) is provided with an air inlet port (31) connected to an air source, the middle portion is provided with a volcanic crater (33) connected to the air inlet end of the valve body (1), the end portion is provided with a pressure relief port (32), and the air outlet end of the valve body (1) is further connected to an air nozzle (2) and an air release port (5). Two sets of independently arranged electromagnetic drive components are used for selectively conducting the air nozzle (2) or the air release port (5), and the two sets of electromagnetic drive components respectively have independently movable moving iron cores, and a static iron core is arranged between the two moving iron cores; A pressure relief assembly (4), comprising: The sealing mechanism is composed of a tightening knob (41) threadedly connected to the pressure relief port (32), a spring (45) axially compressed by the tightening knob (41), and a steel ball (44) preloaded by the spring to close the pressure relief port (32); A silencer mechanism is provided in the pressure relief assembly (4), the silencer mechanism being used for silencing noise during pressure relief; The self-cleaning mechanism comprises a cleaning guide tube (42) fixed to the inner wall of the pressure relief port (32), and the end surfaces of the cleaning guide tube are respectively provided with cleaning members distributed in an annular manner; The silencer mechanism comprises a silencer plate (43) on which a plurality of air holes (431) are evenly distributed. A driving ring (432) is provided in the middle of the silencer plate (43). The inner wall of the driving ring (432) is provided with axial guide grooves (433) and spiral guide grooves (434) that are alternately distributed. The steel ball (44) is provided with a guide head (461) through a push rod (441). When the decompression airflow pushes the steel ball (44) to overcome the spring force, the guide head (461) moves along the spiral guide groove (434) and drives the silencer plate (43) to rotate and self-clean, and returns to its original position along the axial guide groove (433) when the spring (45) is reset.

2. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The end of the axial guide groove (433) is connected to the end of the adjacent spiral guide groove (434), and the spiral guide groove (434) is inclined away from the rotation direction of the silencer plate (43); The connecting portion between the axial guide groove (433) and the spiral guide groove (434) is further connected to a guide piece (435) via a spring shaft. The end of the guide piece (435) contacts the inner wall of the axial guide groove (433) by default and is arranged parallel to the spiral guide groove (434).

3. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The silencer (43) is connected between the fastening knob (41) and the end of the cleaning guide tube (42) through a buckle (411), and a compensation rubber ring (436) is provided between the silencer (43) and the end of the cleaning guide tube (42).

4. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 3, characterized in that: The muffler (43) is provided with a sliding groove at a position corresponding to the buckle (411), and the buckle (411) is inlaid with a guide bead that slides inside the sliding groove.

5. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The sound-absorbing sheet (43) is a metal sheet.

6. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The push rod (441) passes through the middle of the silencer plate (43), and the end of the push rod (441) is fixed with a connecting block (46) by means of bolts. The guide head (461) and the connecting block (46) are integrally formed.

7. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The cleaning member is a rubber strip (422) and a scraping brush (423); the cleaning guide tube (42) is provided with a debris removal channel (421) at the cleaning member, and the debris removal channel (421) penetrates and extends to the outside of the cleaning guide tube (42).

8. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The muffler mechanism comprises a muffler cavity opened at the end of the pressure relief port (32), and the muffler cavity is filled with caustic soda cotton.

9. The automobile lumbar support pressure-maintaining solenoid valve with pressure relief as claimed in claim 1, characterized in that: The pressure relief method of the automobile lumbar support pressure-maintaining solenoid valve with pressure relief comprises the following steps: S1. When inflating the lumbar support airbag of a car, the electromagnetic drive assembly opens the crater (33) channel of the valve body (1), the steel ball (44) is preloaded by the spring to seal the pressure relief port (32), and the external airflow enters the crater (33) along the axial airway (3) through the air inlet (31) and inflates the lumbar support airbag in a directional manner through the air nozzle (2); S2. When the system pressure exceeds a preset threshold, the high-pressure airflow overcomes the resistance of the spring (45) and pushes the steel ball (44) away from the pressure relief port (32), opening the pressure relief channel. The airflow is discharged outward through the air holes (431) of the silencer (43), and the porous damping structure of the silencer (43) suppresses the whistling of the airflow; S3. During the pressure relief process, the axial displacement of the steel ball (44) drives the push rod (441) to move synchronously, driving the guide head (461) to slide along the spiral guide groove (434) on the inner wall of the drive ring (432), forcing the silencer (43) to rotate around the axis. During the rotation, the scraper (423) embedded in the cleaning guide cylinder (42) forms dynamic friction with the surface of the silencer (43), peeling off and removing the particle impurities retained in the pore (431); S4. After the pressure relief is completed, the spring force pushes the steel ball (44) to reset and close the pressure relief port (32), and the push rod (441) slides back to its original position along the axial guide groove (433) of the drive ring (432) through the guide head (461), ensuring the accuracy of the structural reset.

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