Automobile waist support pressure maintaining electromagnetic valve with pressure relief function

Abstract

The invention relates to the technical field of automobile waist support electromagnetic valves, and discloses an automobile waist support pressure maintaining electromagnetic valve with a pressure relief function, which comprises a valve body, an axial air passage is arranged on the valve body, an air inlet communicated with an air source is arranged at the air inlet end of the axial air passage, a crater communicated with the air inlet end of the valve body is arranged in the middle of the axial air passage, and a pressure relief opening is arranged at the tail end of the axial air passage; according to the scheme, aiming at the situation that caustic soda cotton at a pressure relief opening of the automobile waist support pressure maintaining electromagnetic valve is easily blocked by impurities brought out by high-speed airflow, traditional caustic soda cotton is replaced by the metal silencing sheet, the air holes are formed in the silencing sheet to reduce howling noise in the pressure relief process, and meanwhile the ejector rod is additionally arranged for the steel ball; the ejector rod pushes the guide head to reciprocate along with movement of the steel ball in the pressure relief process so as to drive the silencing piece to spin in a linkage mode, the silencing piece can be matched with the scraping brush to brush away blockages in the air hole in the spin process, the function of self-cleaning the air hole is achieved, potential safety hazards caused by blockage of the pressure relief opening are eradicated, and the service life of the air hole is prolonged. And the safety and the reliability of the automobile waist support air bag pressure system are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive lumbar support solenoid valves, and in particular to an automotive lumbar support pressure-holding solenoid valve with pressure relief. Background Art

[0002] A seat lumbar support refers to a support system installed on the backrest of an automotive seat, with a movable support pad installed at the lumbar position for adjusting the front-back and up-down positions, so as to accommodate and support the lumbar curve of the driver and passengers. The lumbar support system can effectively reduce the fatigue of the driver and passengers' lumbar regions and relieve the lumbar fatigue caused by long-distance driving or sitting. Common lumbar support systems are of two types: mechanical and pneumatic. Currently, the pneumatic lumbar support system controls the inflation and deflation of the airbag through a solenoid valve. Therefore, the solenoid valve must simultaneously satisfy the functions of inflating, holding pressure, and deflating the airbag.

[0003] In the prior art, in order to prevent the internal pressure of the air passage from exceeding the set pressure value when the lumbar support pressure-holding solenoid valve inflates the airbag, a pressure relief component is usually set for the solenoid valve. During the pressure relief process, due to pressure factors, the air flow velocity is large, and a whistling noise will be generated when passing through the pressure relief port. The conventional method is to plug sound-absorbing cotton at the pressure relief port in the same way as the air release component. However, in the actual application process, due to the large air flow velocity at the pressure relief port, impurities generated by component wear and metal expansion inside the solenoid valve are easily brought into the pressure relief port, resulting in blockage of the sound-absorbing cotton at the pressure relief port, posing a safety hazard. Therefore, in order to meet the stability of the solenoid valve during pressure relief, an automotive lumbar support pressure-holding solenoid valve with pressure relief is urgently needed to solve the above problems. At the same time, for an automotive seat pneumatic adjustable lumbar support solenoid valve disclosed in Patent Application No. 201910325003.5, both its disclosed metal inflation spool and metal exhaust spool are moving iron cores, and they are prone to wear after long-term use, with a risk of air leakage. Summary of the Invention

[0004] The purpose of the present invention is to provide an automotive lumbar support pressure-holding solenoid valve with pressure relief, aiming to solve the problem that the pressure relief component of the existing lumbar support pressure-holding solenoid valve is prone to blockage.

[0005] The present invention is implemented as follows. An automotive lumbar support pressure-holding solenoid valve with pressure relief includes: A valve body, on which an axial air passage is provided. The intake end of the axial air passage is provided with an intake port communicating with a gas source, a crater communicating with the intake end of the valve body is provided in the middle, a pressure relief port is provided at the end, and a nozzle and an air release port are respectively connected to the outlet end of the valve body. Two sets of independently arranged electromagnetic drive assemblies, which are respectively arranged on the communication paths of the crater, the nozzle, and the air release port for selectively conducting the nozzle or the air release port. The two sets of electromagnetic drive assemblies respectively have independently movable moving iron cores, and a static iron core is arranged between the two moving iron cores. Pressure relief component, comprising: Sealing mechanism, which consists of a fastening knob threadedly connected to the pressure relief port, a spring axially compressed by the fastening knob, and a steel ball that closes the pressure relief port under the pre-tightening force of the spring; Self-cleaning mechanism, including a cleaning guide cylinder fixed to the inner wall of the pressure relief port, and annularly distributed cleaning parts are respectively arranged on the end surface thereof; It further includes a silencing mechanism arranged inside the pressure relief component, and the silencing mechanism is used for silencing during pressure relief.

[0006] Preferably, the silencing mechanism includes a silencing plate, a driving ring is arranged in the middle of the silencing plate, axially guiding grooves and spiral guiding grooves are alternately distributed on the inner wall of the driving ring, a guiding head is arranged on the steel ball through a push rod, when the pressure relief air flow pushes the steel ball to overcome the spring force, the guiding head moves along the spiral guiding groove and drives the silencing plate to rotate for self-cleaning, and returns along the axially guiding groove when the spring resets; The end of the axially guiding groove is connected to the end of the adjacent spiral guiding groove, and the spiral guiding groove is inclined in the direction opposite to the rotation direction of the silencing plate; A guiding piece is also connected to the connecting part of the axially guiding groove and its spiral guiding groove through a spring shaft, and the end of the guiding piece abuts against the inner wall of the axially guiding groove by default and is arranged parallel to the spiral guiding groove.

[0007] Preferably, the silencing plate is connected between the fastening knob and the end of the cleaning guide cylinder by a buckle, and a compensation rubber ring is arranged between the silencing plate and the end of the cleaning guide cylinder.

[0008] Preferably, the silencing plate is provided with a sliding groove at the corresponding position of the buckle, and guide beads sliding inside the sliding groove are inlaid on the buckle.

[0009] Preferably, the silencing plate is a metal thin plate, and a number of air holes are evenly distributed thereon.

[0010] Preferably, the push rod penetrates through the middle of the silencing plate, a connecting block is fixed to the end of the push rod by a bolt, and the guiding head is integrally formed with the connecting block.

[0011] Preferably, the cleaning parts are rubber strips and brushes, a waste discharging channel is opened at the position of the cleaning parts on the cleaning guide cylinder, and the waste discharging channel penetrates through and extends to the outside of the cleaning guide cylinder.

[0012] Preferably, the silencing mechanism includes a silencing cavity opened at the end of the pressure relief port, and caustic soda cotton is filled in the silencing cavity.

[0013] Preferably, the pressure relief method of the pressure relief automotive lumbar support pressure maintaining solenoid valve includes the following steps: 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. 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. 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; 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.

[0014] The present invention discloses a car lumbar support pressure-maintaining solenoid valve with pressure relief, which has the following beneficial effects: 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; 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

[0015] 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; 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; 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; 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; Figure 5 Exploded structure diagram of the pressure relief component of a pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention; Figure 6 A pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention Figure 5 Enlarged structure diagram of part B in it; Figure 7 Structure diagram of the guide head of a pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention; Figure 8 Another perspective exploded structure diagram of the pressure relief component of a pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention; Figure 9 Flow direction diagram of the impurity discharge channel for cleaning the guide cylinder of a pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention; Figure 10 Structure diagram of the silencing piece and driving ring of a pressure maintaining solenoid valve for a car lumbar support with pressure relief provided by an embodiment of the present invention.

[0016] Legend: 1. Valve body; 2. Air nozzle; 3. Axial air passage; 4. Pressure relief assembly; 5. Air release port; 31. Air inlet; 32. Pressure relief port; 33. Crater; 41. Tightening knob; 42. Cleaning guide cylinder; 43. Silencing piece; 44. Steel ball; 45. Spring; 46. Connecting block; 411. Buckle; 421. Impurity discharge channel; 422. Rubber strip; 423. Scraper; 431. Air hole; 432. Driving ring; 433. Axial guide groove; 434. Spiral guide groove; 435. Guide piece; 436. Compensation rubber ring; 441. Thumb rod; 461. Guide head. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, 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 used to limit the present invention.

[0018] In the figures of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the figures. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the figures are only for illustrative purposes and should not be construed as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0020] This solution aims to solve the problem that in the actual application process, due to the large air flow velocity at the pressure relief port of the automotive 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, resulting in blockage of the caustic cotton at the pressure relief port. In an environment with humid air, it is also easy for the caustic cotton to absorb water and expand to block the pressure relief, posing a safety hazard.

[0021] Embodiment 1. In this embodiment: Refer to Figures 1-3 As shown, it is a preferred embodiment provided by the present invention.

[0022] A pressure-relieving automotive lumbar support pressure maintaining solenoid valve in this embodiment includes: A valve body 1, on which an axial air passage 3 is provided. The intake end of the axial air passage 3 is provided with an intake port 31 communicating with the air source. In the middle, a crater 33 (the crater 33 is the passage port connecting the axial air passage 3 and the valve body 1) communicating with the intake end of the valve body 1 is provided. The end is provided with a pressure relief port 32. The outlet end of the valve body 1 is also respectively connected with a nozzle 2 and a bleed port 5; Two groups of independently arranged electromagnetic drive components, which are respectively arranged on the communication paths of the crater 33, the nozzle 2 and the bleed port 5 for selectively conducting the nozzle 2 or the bleed port 5; the two groups of electromagnetic drive components respectively include independently arranged Pin pins for supplying power to the coils in the electromagnetic drive components, thereby generating electromagnetic forces to respectively drive two moving iron cores to perform independent clutch movements with a static iron core arranged between the two electromagnetic drive components, and then using rubber gaskets to complete the opening and closing operations of the air path; Among them, solenoid valve springs are respectively arranged between the two groups of moving iron cores and the static iron core. When the electromagnetic drive assembly is powered off, the moving iron core moves away from the static iron core and blocks the air passage. The two groups of electromagnetic drive assemblies respectively have independently movable moving iron cores, and a static iron core is arranged between the two moving iron cores. The inflating valve and the pressure maintaining valve of this solenoid valve share a static iron core, avoiding the risk of air leakage in the assembly of the inflating valve and the pressure maintaining valve. The two groups of electromagnetic drive assemblies 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 does not move during the inflation and deflation processes, the situation of wear can be avoided. Compared with the traditional opening and closing method of two moving iron cores, the risk of air leakage in the assembly is greatly reduced; When the air passage is under pressure maintaining effect, both the upper and lower electromagnetic drive assemblies are not powered on, and the air flow enters the lower electromagnetic drive assembly of the valve body 1 from the air nozzle 2 and is blocked, forming a normally sealed effect as a whole; When in the inflation mode, the upper electromagnetic drive assembly is powered on to open the crater 33, and the air flow enters the crater 33 from the air inlet 31 of the axial air passage 3, flows at an angle to the air nozzle 2 and enters the airbag of the vehicle lumbar support. The pressure relief assembly 4 maintains a sealed state until the system is overpressurized; When in the deflation mode, the upper electromagnetic drive assembly is not powered on and is sealed, and the lower electromagnetic drive assembly is powered on and opened. The air flow enters the valve body 1 from the air nozzle 2 and enters the deflation port 5 through the lower electromagnetic drive assembly, and is discharged from the deflation port 5; During the pressure relief process, the steel ball 44 blocks the pressure relief port 32 under the spring force and maintains the internal pressure of the air passage. When the internal pressure of the air passage exceeds the set pressure value, the system is overpressurized, and the steel ball 44 is pushed away from the pressure relief port 32 to open it. After the air flow enters the pressure relief port 32, it flows out to the outside through the air holes 431 of the sound-absorbing sheet 43.

[0023] Figures 4-7 Among them, a pressure relief vehicle lumbar support pressure maintaining solenoid valve further includes a pressure relief assembly 4, which has: a sealing mechanism, a self-cleaning mechanism and a sound-absorbing mechanism; The sealing mechanism is composed of a fastening knob 41 threadedly connected to the pressure relief port 32, a spring 45 axially pressed by the fastening knob 41, and a steel ball 44 that closes the pressure relief port 32 under the pre-tightening force of the spring. During the process of screwing the fastening knob 41 towards the pressure relief port 32, the spring 45 will be squeezed to push the steel ball 44 to seal the pressure relief port 32, and the pre-tightening force of the steel ball 44 on the pressure relief port 32 increases with the depth of the fastening knob 41 screwed into the pressure relief port 32; In Figure 5 and Figure 9 Among them, the self-cleaning mechanism includes a cleaning guide cylinder 42 fixed to the inner wall of the pressure relief port 32. The end of the cleaning guide cylinder 42 is semicircularly arranged, and cleaning parts are respectively arranged on the surface of its end in a circumferential distribution; The cleaning parts are the rubber strip 422 and the brush 423. The cleaning guide cylinder 42 is provided with a debris discharge channel 421 at the position of the cleaning parts, and the debris discharge channel 421 penetrates and extends to the outside of the cleaning guide cylinder 42 to prevent impurities from blocking the pressure relief air duct. Among them, the function of the rubber strip 422 is to seal the debris discharge channel 421 to prevent air flow from escaping from the debris discharge channel 421 during the pressure relief process. During Figure 7 Normally, the air flow during the pressure relief process is discharged through the air holes 431 of the part of the sound-absorbing sheet 43 that does not contact the cleaning guide cylinder 42. The function of the brush 423 is to scrape the impurities on the surface of the sound-absorbing sheet 43 that rotates into the debris discharge channel 421 at the end of the cleaning guide cylinder 42. A number of air holes 431 are evenly distributed on it, so that the impurities blocking the air holes 431 on the surface of the sound-absorbing sheet 43 are brushed off to avoid blockage. It should be noted that the sound-absorbing sheet 43 is a metal thin sheet, which reduces wear and effectively avoids the situation that the caustic soda cotton swells due to moisture and blocks the air duct.

[0024] During Figure 6 The sound-absorbing mechanism includes a sound-absorbing sheet 43. A driving ring 432 is provided in the middle of the sound-absorbing sheet 43. Axial guide grooves 433 and spiral guide grooves 434 are alternately distributed on the inner wall of the driving ring 432. The steel ball 44 is provided with a guide head 461 through a push rod 441. When the pressure relief air flow pushes the steel ball 44 to overcome the spring force, the guide head 461 moves along the spiral guide groove 434 and drives the sound-absorbing sheet 43 to rotate for self-cleaning, and returns along the axial guide groove 433 when the spring 45 resets. Among them, during Figure 10 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 in the direction opposite to the rotation direction of the sound-absorbing sheet 43; since the moving direction of the guide head 461 is parallel to the axis direction of the sound-absorbing sheet 43, when the guide head 461 moves in the spiral guide groove 434, the sound-absorbing sheet 43 will be pushed to rotate. After the guide head 461 moves out of the outside of the driving ring 432, it is reset under the action of the spring 45. A chamfer is provided at the end of the axial guide groove 433 to make the guide head 461 enter the axial guide groove 433 more smoothly when resetting.

[0025] Further, a guiding piece 435 is connected to the connecting part of the axial guiding groove 433 and its spiral guiding groove 434 through a spring shaft. The end of the guiding piece 435 abuts against the inner wall of the axial guiding groove 433 by default and is arranged parallel to the spiral guiding groove 434. During the resetting process of the guide head 461, the guide head 461 will push the guiding piece 435 open. Until the guide head 461 disengages from the axial guiding groove 433, the guiding piece 435 will re-close due to the action of the spring shaft. At this time, when the guide head 461 enters the connecting part of the axial guiding groove 433 and the spiral guiding groove 434 again, it will only be pushed by the guiding piece 435 into the spiral guiding groove 434 and will not reciprocate inside the axial guiding groove 433, avoiding the situation that the sound-absorbing piece 43 does not rotate with the movement of the guide head 461.

[0026] It should be noted that, in Figure 7 , the ejector rod 441 penetrates through the middle of the sound-absorbing piece 43. A connecting block 46 is fixed to the end of the ejector rod 441 by a bolt. The guide head 461 is integrally formed with the connecting block 46. During the disassembly and replacement process of the sound-absorbing piece 43, only the bolt needs to be unscrewed and the connecting block 46 is removed to take down the sound-absorbing piece 43 from the end of the ejector rod 441.

[0027] In this embodiment, the sound-absorbing piece 43 is connected between the fastening knob 41 and the end of the cleaning guide cylinder 42 through a buckle 411. A compensation rubber ring 436 is arranged between the sound-absorbing piece 43 and the end of the cleaning guide cylinder 42. The compensation rubber ring 436 can seal the gap between the cleaning guide cylinder 42 and the sound-absorbing piece 43, avoiding the escape of air flow with impurities and also avoiding the friction between the cleaning guide cylinder 42 and the sound-absorbing piece 43.

[0028] The sound-absorbing piece 43 is provided with a sliding groove at the corresponding position of the buckle 411, and guide beads sliding inside the sliding groove are embedded on the buckle 411. While the buckle 411 presses the sound-absorbing piece 43, the friction between the buckle 411 and the sound-absorbing piece 43 is reduced, avoiding the situation that the sound-absorbing piece 43 becomes loose due to wear.

[0029] 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.

[0030] 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. 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.

[0031] 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. Caustic cotton has stronger acid and alkali resistance, better tolerance to corrosive media such as oil stains and chemical solvents, is suitable for air flow environments containing oil or chemicals, and can prevent the material from failing due to corrosion; Caustic cotton is not easily melted or deformed in high-temperature and high-pressure air flows, maintaining a stable porous structure and sound absorption performance; The fibers of caustic cotton are more tightly intertwined, having certain mechanical strength and resistance to air flow erosion, and can reduce the problems of fiber shedding or structural collapse caused by air flow impact during long-term use.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, 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 can be understood according to specific circumstances. In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise clearly and specifically defined.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automotive lumbar support pressure-holding solenoid valve with pressure relief, characterized in that Comprising: A valve body (1) is provided with an axial air passage (3) thereon. The intake end of the axial air passage (3) is provided with an intake port (31) communicating with a gas source. A crater (33) communicating with the intake end of the valve body (1) is arranged in the middle, and a pressure relief port (32) is arranged at the end. The outlet end of the valve body (1) is also respectively connected with a nozzle (2) and a bleed port (5); Two groups of independently arranged electromagnetic drive components are respectively arranged on the communication paths of the crater (33), the nozzle (2) and the bleed port (5) for selectively conducting the nozzle (2) or the bleed port (5). 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; A pressure relief component (4), which comprises: A sealing mechanism, which consists of a fastening knob (41) threadedly connected to the pressure relief port (32), a spring (45) axially pressed by the fastening knob (41), and a steel ball (44) that closes the pressure relief port (32) under the pre-tightening force of the spring; A silencing mechanism arranged in the pressure relief component (4), and the silencing mechanism is used for silencing during pressure relief; A self-cleaning mechanism, which includes a cleaning guide cylinder (42) fixed to the inner wall of the pressure relief port (32), and annularly distributed cleaning parts are respectively arranged on the end surface of the cleaning guide cylinder; The silencing mechanism includes a silencing sheet (43). A driving ring (432) is arranged in the middle of the silencing sheet (43). Axial guide grooves (433) and spiral guide grooves (434) are alternately arranged on the inner wall of the driving ring (432). The steel ball (44) is provided with a guide head (461) through a push rod (441). When the pressure relief air flow pushes the steel ball (44) to overcome the spring force, the guide head (461) moves along the spiral guide groove (434) and drives the silencing sheet (43) to rotate for self-cleaning, and returns along the axial guide groove (433) when the spring (45) resets.

2. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief as claimed in claim 1, wherein, 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 in the direction opposite to the rotation direction of the silencing sheet (43); A guiding piece (435) is also connected to the connecting part of the axial guide groove (433) and the spiral guide groove (434) through a spring shaft. The end of the guiding 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).

3. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief as claimed in claim 1, wherein The silencing sheet (43) is connected between the fastening knob (41) and the end of the cleaning guide cylinder (42) through a buckle (411), and a compensation rubber ring (436) is arranged between the silencing sheet (43) and the end of the cleaning guide cylinder (42).

4. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief according to claim 3, characterized in that, A chute is arranged at the position corresponding to the buckle (411) on the silencing sheet (43), and guide beads sliding inside the chute are inlaid on the buckle (411).

5. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief as claimed in claim 1, wherein The silencing sheet (43) is a metal thin sheet, and a plurality of air holes (431) are evenly distributed thereon.

6. The pressure-holding electromagnetic valve for a car lumbar support with pressure relief as described in claim 1, characterized in that, The push rod (441) penetrates through the middle of the silencing sheet (43), and a connecting block (46) is fixed to the end of the push rod (441) through a bolt, and the guide head (461) is integrally formed with the connecting block (46).

7. The pressure-holding solenoid valve for a car lumbar support with pressure relief as described in claim 1, characterized in that, The cleaning member is a rubber strip (422) and a wiper (423). The cleaning guide cylinder (42) is provided with a debris discharge channel (421) at the position of the cleaning member, and the debris discharge channel (421) penetrates and extends to the outside of the cleaning guide cylinder (42).

8. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief as claimed in claim 1, wherein The sound absorption mechanism includes a sound absorption cavity opened at the end of the pressure relief port (32), and the sound absorption cavity is filled with caustic cotton.

9. The pressure-holding solenoid valve for an automotive lumbar support with pressure relief as claimed in claim 1, wherein The pressure relief method of the pressure maintaining electromagnetic valve for the car lumbar support with pressure relief includes the following steps: S1. When inflating the airbag of the car lumbar support, the electromagnetic drive assembly opens the crater (33) channel of the valve body (1). The steel ball (44) seals the pressure relief port (32) under the pre-tightening force of the spring. External air flows into the crater (33) along the axial air duct (3) through the air inlet (31) and is directionally inflated into the lumbar support airbag through the air nozzle (2). S2. When the system pressure exceeds the preset threshold, the high-pressure air flow 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 air flow is discharged outward through the air holes (431) of the sound absorption plate (43), and the porous damping structure of the sound absorption plate (43) suppresses the air flow whistling. S3. During the pressure relief process, the axial displacement of the steel ball (44) drives the ejector rod (441) to move synchronously, driving the guide head (461) to slide along the spiral guide groove (434) on the inner wall of the driving ring (432), forcing the sound absorption plate (43) to spin around the axis. During the rotation process, the wiper (423) embedded in the cleaning guide cylinder (42) forms dynamic friction with the surface of the sound absorption plate (43), peeling off and removing the particulate impurities retained in the air holes (431). S4. After the pressure relief is completed, the spring force pushes the steel ball (44) to reset and seal the pressure relief port (32). The ejector rod (441) slides back to its original position along the axial guide groove (433) of the driving ring (432) through the guide head (461) to ensure the accurate reset of the structure.

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