A valve core and a gas filling / discharging valve

Abstract

This utility model provides a valve core, belonging to the field of valve technology. The valve core includes a valve body, a valve stem, and a flexible sealing plate. The valve body has an air passage, and the flexible sealing plate is disposed within the air passage and fixedly connected to the valve stem. The valve body has an external air port and an internal air port communicating with the air passage. An external sealing surface and an internal sealing surface are respectively located at the outer and inner ends of the valve body. The external air port is located inside the external sealing surface, and the internal air port is located inside the internal sealing surface. The valve stem can drive the flexible sealing plate to move within the air passage, and the flexible sealing plate can maintain a tight seal with the external or internal sealing surface. This utility model also proposes a filling / discharging valve, including a housing, a valve core, and an end cap. The valve core is fixedly installed inside the housing, with the external air port of the valve core facing the outer port of the housing, and the internal air port of the valve core facing the inner port of the housing. This utility model has the advantage of being able to switch the sealing direction unidirectionally during filling and discharging.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and relates to a valve core and a gas filling / discharging valve. Background Technology

[0002] Air valves are widely used in products that require inflation, such as inflatable mattresses, inflatable castles, inflatable boats, and foam inflatable beds. The characteristic of inflatable products is that they form a three-dimensional structure when inflated to fulfill their function, and can be deflated and folded for easy storage when not in use. Current inflatable products generally use one-way air valves. One-way air valves can achieve one-way outward sealing and one-way inward inflation, keeping the inflatable product inflated. Deflating requires a separate deflation valve. Because one-way air valves can inflate inwards, when the inflatable product is deflated and folded up, due to the elasticity of the material, outside air is drawn in through the one-way air valve during the expansion process, causing the inflatable product to gradually expand and increase the storage space required.

[0003] To address the aforementioned issues, a charging / discharging valve has been disclosed. This valve can switch the direction of the one-way seal, combining charging and discharging functions while preventing reverse air intake after discharging. For example, a valve disclosed in Chinese patent literature [Application No. 201610096361.X] includes a valve body and a valve core disc. The valve body has a channel for fluid passage. The valve core disc is disposed within the channel and rotates relative to the valve body. The valve core disc has a through hole, and a one-way diaphragm is provided on one side of the valve core disc for one-way sealing of the through hole, thus ensuring the valve core disc seals the channel in one direction. This patent achieves this by using a valve core disc that can rotate 180° to switch the one-way sealing direction during charging and discharging; the switching method involves flipping the entire valve core disc. Another example is an inflatable cushion with a quick-release air nozzle disclosed in Chinese patent literature [Application No. 202210731199.X]. This cushion includes an air nozzle comprising a base, an inflation / deflation channel, and a sealing cap. The sealing cap is detachably and sealingly inserted into the inflation / deflation channel, which is detachably and sealingly inserted into the base. An air release pad and an inflation pad are respectively provided at the upper and lower parts of the internal support of the inflation / deflation channel. The unidirectional sealing direction is switched during inflation / deflation using the air release pad and the inflation pad, respectively, and this switching is controlled by turning a horizontal knob. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a valve core. The technical problem solved by this utility model is to provide a new structure to achieve switching of the unidirectional sealing direction of the valve core.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A valve core includes a valve body, a valve stem, and a flexible sealing sheet. The valve body has an air passage, and the flexible sealing sheet is disposed within the air passage and fixedly connected to the valve stem. The valve body has an external air port communicating with the air passage at its outer end, and an internal air port communicating with the air passage at its inner end. The valve body has an annular external sealing surface and an annular internal sealing surface at its outer and inner ends, respectively. The external air port is located inside the external sealing surface, and the internal air port is located inside the internal sealing surface. The valve stem can drive the flexible sealing sheet to move within the air passage, and the flexible sealing sheet can maintain a tight seal with the external or internal sealing surface.

[0007] The valve stem extends into the valve body. Moving the valve stem causes the flexible sealing plate to move. The flexible sealing plate deforms when subjected to force. Specifically, when the flexible sealing plate is located on the side of the outer air port of the air passage, the flexible sealing plate and the outer sealing surface are in close contact and sealed. At this time, the flexible sealing plate covers and seals the outer air port, while the inner air port is in the open state. When the air pressure outside the outer air port is greater than the air pressure inside the air passage, the flexible sealing plate will be deformed inward by force, causing the flexible sealing plate and the outer sealing surface to partially separate and connect with the air passage. Air outside the outer air port can enter the air passage. When the air pressure outside the outer air port is less than or equal to the air pressure inside the air passage, the flexible sealing plate will rebound and return to a complete seal with the outer sealing surface. Air on the inner air port side cannot flow out through the outer air port, thus achieving a one-way outward seal of the outer air port.

[0008] When the flexible sealing strip is located on the inner air port side of the airway, the flexible sealing strip and the inner sealing surface are in close contact and sealed. At this time, the flexible sealing strip covers and seals the inner air port, while the outer air port is in the open state. When the air pressure outside the inner air port is greater than the air pressure inside the airway, the flexible sealing strip will be deformed inward by force, causing the flexible sealing strip and the inner sealing surface to partially separate and connect with the airway. Air outside the inner air port can enter the airway. When the air pressure outside the inner air port is less than or equal to the air pressure inside the airway, the flexible sealing strip will rebound and reset to fully contact and seal the inner sealing surface again. Air on the outer air port side cannot flow in through the inner air port, thus achieving a one-way inward seal of the inner air port.

[0009] When the flexible sealing plate is in contact with the outer sealing surface, the valve core allows air to pass in one direction and seals out one direction; when the flexible sealing plate is in contact with the inner sealing surface, the valve core allows air to pass out one direction and seals in one direction. The valve core can switch the unidirectional air passage direction by adjusting the position of the flexible sealing plate, thus switching the unidirectional sealing direction during inflation and deflation. In use, the position of the flexible sealing plate is adjusted by moving the valve stem. The structure is simple and the operation is convenient.

[0010] In the aforementioned valve core, the outer sealing surface is a frustum, which slopes inward from the outer edge toward the outer air port. When the air pressure outside the outer air port is less than the air pressure inside the air passage, the flexible sealing sheet will deform into a frustum shape on the outer sealing surface due to the air pressure inside the air passage. The frustum-shaped outer sealing surface can fit more closely with the flexible sealing sheet, improving the one-way sealing effect. However, when the air pressure outside the outer air port is greater than the air pressure inside the air passage, only the edge of the flexible sealing sheet fits with the outer sealing surface. Therefore, the deformation of the flexible sealing sheet is more likely to create a gap between it and the outer sealing surface, making it easier to inflate and improving the inflation efficiency.

[0011] In the aforementioned valve core, the inner sealing surface is a frustum, which slopes inward from the outer edge towards the inner air port. When the air pressure in the air passage is greater than the air pressure outside the inner air port, the flexible sealing sheet deforms into a frustum shape towards the inner sealing surface due to the air pressure inside the air passage. The frustum-shaped inner sealing surface fits the flexible sealing sheet better, improving the one-way sealing effect. When the air pressure in the air passage is less than the air pressure outside the inner air port, only the edge of the flexible sealing sheet fits the inner sealing surface. Therefore, the deformation of the flexible sealing sheet makes it easier to form a gap with the inner sealing surface, allowing for easier air release and improving the air release efficiency.

[0012] In the aforementioned valve core, the flexible sealing sheet is made of silicone, rubber, or a flexible plastic sheet. The flexible sealing sheet made of these materials can deform under stress and can also fit tightly against the valve body for a seal, achieving unidirectional sealing.

[0013] In the valve core described above, the valve stem passes through the outer end of the valve body and is located inside the outer sealing surface.

[0014] In the valve core described above, the valve stem has an annular groove on a section located inside the valve body, and the flexible sealing sheet is fitted into the annular groove.

[0015] In the valve core described above, the valve stem passes through the outer end of the valve body and is located outside the outer sealing surface.

[0016] In the valve core described above, a fixing clip is fixed on a section of the valve stem located inside the valve body, and the fixing clip clamps the flexible sealing sheet.

[0017] In the aforementioned valve core, a press-locking mechanism is provided between the valve stem and the valve body, which allows the flexible sealing sheet to maintain a tight seal with both the outer and inner sealing surfaces. Pressing the valve stem causes the flexible sealing sheet to move back and forth, ensuring the sheet remains in a tight, sealed state.

[0018] In the aforementioned valve core, the self-locking mechanism includes a self-locking buckle, a buckle male head, and a spring. The valve stem passes through the outer end of the valve body, and the inner end of the valve stem is located inside the valve body. The buckle male head is fixed to the inner end of the valve stem. The self-locking buckle is fixedly installed inside the valve body and faces the buckle male head. The spring is sleeved on the section of the valve stem located outside the valve body. One end of the spring abuts against the valve body, and the other end of the spring abuts against the outer end of the valve stem. When the self-locking buckle and the buckle male head are locked, the spring is compressed and the flexible sealing sheet is in contact with the inner sealing surface for sealing. When the flexible sealing sheet is in contact with the outer sealing surface for sealing, the spring is pressed against the outer end of the valve stem.

[0019] The valve stem has a push button at one end outside the valve body. Pressing the button controls the movement of the valve stem. When the valve stem is pressed, it overcomes the spring force and moves towards the inner end of the valve body. The flexible sealing plate moves to a position where it is in contact with the inner sealing surface, and at this point, the self-locking latch and the male latch lock, ensuring a tight seal between the flexible sealing plate and the inner sealing surface. Pressing the valve stem again unlocks the self-locking latch and the male latch, and under the spring force, the valve stem moves back to the outer end of the valve body, resetting to a position where the flexible sealing plate is in contact with the outer sealing surface. The spring remains pressed against the valve stem, ensuring a tight seal between the flexible sealing plate and the outer sealing surface. The combination of the self-locking latch and the spring controls the unidirectional airflow direction of the valve core by pressing the valve stem. After pressing, the flexible sealing plate automatically locks itself in contact with either the outer or inner sealing surface, making operation simpler.

[0020] In another scenario, in the aforementioned valve core, the self-locking mechanism includes a ball and a spring. The outer end of the valve body is provided with a guide sleeve. The inner wall of the guide sleeve has a circumferentially arranged annular groove. The groove includes staggered, interconnected high-tooth and low-tooth grooves, arranged at different heights. A guide surface is provided between the high-tooth and low-tooth grooves. The valve stem passes through the guide sleeve and has an annular groove. The ball is positioned between the annular groove and the groove. The spring is located within the valve body. One end of the spring abuts against the valve stem, and the other end abuts against the inner end of the valve body. When the ball is located in the high-tooth groove, the flexible sealing sheet is in contact with the outer sealing surface for sealing. When the ball is located in the low-tooth groove, the flexible sealing sheet is in contact with the inner sealing surface for sealing.

[0021] When the valve stem is pressed, the ball passes through the guide surface and enters from the high tooth groove to the low tooth groove. When the valve stem is pressed again, the ball passes through the guide surface and enters the next low tooth groove. This process is repeated, and the ball rolls around the annular groove. At the same time, the high and low tooth grooves drive the valve stem to move back and forth. The spring is always pressed on the valve stem, so that the ball can be kept in the high or low tooth groove. This allows the flexible sealing sheet to keep in close contact with the inner or outer sealing surface and achieve a seal. After pressing, the flexible sealing sheet can be automatically locked in a state of close contact with the outer or inner sealing surface, making the operation simpler.

[0022] In another scenario, the valve core described above includes a pressure-pull locking mechanism between the valve stem and the valve body, which allows the flexible sealing sheet to maintain a tight seal with both the outer and inner sealing surfaces. The valve stem moves the flexible sealing sheet through a pressing and pulling motion, ensuring the sheet remains in a sealed position.

[0023] In the aforementioned valve core, the press-pull locking mechanism includes a positioning ball. A limiting sleeve is provided at the inner end of the valve body. The valve stem passes through the outer end of the valve body, with its lower section inserted into the limiting sleeve. The limiting sleeve has an outer positioning groove and an inner positioning groove spaced apart along the axial direction of the valve body. A positioning ball is installed on the lower section of the valve stem. When the valve stem moves up and down, the positioning ball can respectively engage in the outer and inner positioning grooves. Pressing the valve stem inward or pulling it outward allows the valve stem to move the flexible sealing sheet within the air passage. When pressed inward to the desired position, the positioning ball engages in the inner positioning groove, at which point the flexible sealing sheet and the inner sealing surface are in contact and sealed. The positioning ball ensures that the flexible sealing sheet and the inner sealing surface remain in contact and sealed. When pulled outward to the desired position, the positioning ball engages in the outer positioning groove, at which point the flexible sealing sheet and the outer sealing surface are in contact and sealed. The positioning ball ensures that the flexible sealing sheet and the outer sealing surface remain in contact and sealed.

[0024] In the aforementioned valve core, the pressure-pull locking mechanism includes a damping sleeve. A limiting sleeve is provided at the inner end of the valve body. Two limiting protrusions are spaced axially along the inner wall of the limiting sleeve. The valve stem passes through the outer end of the valve body, with its lower section inserted into the limiting sleeve. The damping sleeve is fixedly fitted onto the lower section of the valve stem. When the valve stem moves up and down, the damping sleeve can engage with the two limiting protrusions respectively. Pressing the valve stem inward or pulling it outward allows the valve stem to move the flexible sealing plate within the air passage. When pressed inward to its full position, the damping sleeve engages with the outer limiting protrusion, at which point the flexible sealing plate is in contact with the inner sealing surface for a seal. When pulled outward to its full position, the damping sleeve engages with the inner limiting protrusion, at which point the flexible sealing plate is in contact with the outer sealing surface for a seal. The friction between the damping sleeve and the limiting protrusions ensures that the flexible sealing plate remains in contact with both the outer and inner sealing surfaces for a seal.

[0025] In another scenario, the valve core described above includes a rotary locking mechanism between the valve stem and the valve body, which allows the flexible sealing sheet to maintain a tight seal with both the outer and inner sealing surfaces. Rotating the valve stem moves the flexible sealing sheet, ensuring it remains in a sealed position.

[0026] In the aforementioned valve core, the rotary locking mechanism includes a threaded section on the valve stem and a threaded hole on the outer end of the valve body. The threaded section of the valve stem is screwed into the threaded hole. Limiting nuts are connected to both ends of the threaded section on the valve stem, one of which is located inside the valve body, and the other outside. Rotating the valve stem allows the flexible sealing plate to move within the air passage. The two limiting nuts limit the travel of the valve stem. When the limiting nut inside the valve body abuts against the valve body, the flexible sealing plate seals against the outer sealing surface. When the limiting nut outside the valve body abuts against the valve body, the flexible sealing plate seals against the inner sealing surface. The screwed connection between the valve stem and the valve body has a self-locking function, ensuring the flexible sealing plate remains sealed against either the outer or inner sealing surface. Operation is simple and convenient; simply rotate the valve stem to extend one end through the valve body.

[0027] In the aforementioned valve core, the rotary locking mechanism includes a steel ball and a spring. A limiting sleeve is provided at the inner end of the valve body. Guide grooves are respectively formed on the inner wall of the limiting sleeve. Each guide groove includes an outer positioning section, an inner positioning section, a linear reset section, and a spiral guide section. Both the outer and inner positioning sections are circumferentially arranged arc segments, with the arc of the outer positioning section being smaller than that of the inner positioning section. The outer positioning section is located at the inner end of the limiting sleeve, and the inner positioning section is located at the outer end of the limiting sleeve. One end of the outer positioning section is aligned with one end of the inner positioning section and connected by the linear reset section. The spiral guide section connects the other ends of the outer and inner positioning sections. The spring is disposed within the valve body, with one end abutting against the valve stem and the other end abutting against the inner end of the valve body. The valve stem passes through the outer end of the valve body, and its lower section passes through the limiting sleeve. The steel ball is rolled on the outer wall of the lower section of the valve stem and is rolled within the guide groove.

[0028] When the valve stem is rotated, the steel ball rolls along the guide groove. When the steel ball is in the outer positioning section, the flexible sealing plate is in contact with the outer sealing surface for sealing; when the steel ball is in the inner positioning section, the flexible sealing plate is in contact with the inner sealing surface for sealing. In use, by rotating the valve stem, the steel ball enters the spiral guide section from the outer positioning section. Guided by the spiral guide section, the valve stem moves towards the inner end of the valve body, causing the flexible sealing plate to move towards the inner sealing surface. When the steel ball moves to the inner positioning section, the flexible sealing plate moves to the position where it is in contact with the inner sealing surface for sealing. Simply keeping the steel ball in the inner positioning section is sufficient to maintain the seal. When switching the ventilation direction, continue rotating the valve stem to move the steel ball to the position aligned with the linear reset section. At this time, under the action of the spring, the steel ball will move along the linear reset section to the outer positioning section, causing the valve stem to reset back to the position where the flexible sealing plate is in contact with the outer sealing surface for sealing. By rotating the valve stem, the position of the flexible sealing plate can be adjusted and kept in the position where it is in contact with the inner or outer sealing surface for sealing. The operation is simple and convenient.

[0029] The purpose of this utility model is to address the aforementioned problems in the existing technology and to propose a gas filling and releasing valve. The technical problem solved by this utility model is to enable the valve to switch between unidirectional sealing directions.

[0030] A gas filling / discharging valve includes a housing and an end cap, the end cap covering the outer port of the housing, characterized in that it further includes the aforementioned valve core, the valve core being fixedly installed inside the housing, the outer air port of the valve core facing the outer port of the housing, and the inner air port of the valve core facing the inner port of the housing.

[0031] The inflation / deflation valve can be installed on the inflatable product. The outer shell is fixedly connected to the inflatable product, and the outer port of the outer shell can be connected to an air pump. When inflating, the valve core is in a one-way outward sealing state, allowing air to be injected into the valve to inflate and expand the inflatable product. After inflation is complete, the air pump is turned off, and the valve core seals outward to prevent air leakage. When deflation is required, the valve stem is operated to switch the one-way sealing direction of the valve core, so that the valve core is in a one-way inward sealing state, allowing the air inside the valve to be discharged outward, thus expelling the air from the inflatable product and retracting it. After complete deflation, the valve core seals inward to prevent outside air from entering the valve, thereby preventing the inflatable product from gradually expanding in the retracted state.

[0032] Compared with existing technologies, this valve core has the advantages of being able to switch the sealing direction in one direction during inflation and deflation, and having a simple structure and convenient operation. This inflation / deflation valve has the advantages of preventing air leakage after inflation and preventing outside air from re-entering the inflated product due to the elasticity of the inflated product itself after deflation. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the end cap of this inflation / deflation valve when it is open.

[0034] Figure 2 This is a schematic diagram of the exploded structure of the gas filling and releasing valve.

[0035] Figure 3 This is a three-dimensional structural diagram of the valve core in Example 1.

[0036] Figure 4 This is a cross-sectional structural diagram of the valve core when the external air port is sealed in one direction in Embodiment 1.

[0037] Figure 5 This is a cross-sectional view of the valve core when it is vented in one direction in Embodiment 1.

[0038] Figure 6 This is a cross-sectional structural diagram of the valve core when the internal air port is sealed in one direction in Embodiment 1.

[0039] Figure 7 This is a cross-sectional view of the valve core when it is vented in one direction in Embodiment 1.

[0040] Figure 8 This is a three-dimensional structural diagram of the lower valve body in Embodiment 1.

[0041] Figure 9 This is a three-dimensional structural diagram of the upper valve body in Embodiment 1.

[0042] Figure 10 This is a cross-sectional view of the valve core when it is vented in one direction in Embodiment 4.

[0043] Figure 11 This is a cross-sectional view of the valve core in embodiment four when the internal air port is open in one direction.

[0044] Figure 12 This is a cross-sectional structural diagram of the valve core when the external air port is sealed in one direction in Embodiment 7.

[0045] Figure 13 This is a cross-sectional structural diagram of the valve core when the internal air port is sealed in one direction in Embodiment 7.

[0046] In the diagram, 1 is the outer casing; 11 is the end cap; 2 is the valve core; 3 is the valve body; 31 is the upper valve body; 32 is the lower valve body; 33 is the air passage; 34 is the outer sealing surface; 35 is the outer air port; 36 is the inner sealing surface; 37 is the inner air port; 4 is the valve stem; 41 is the convex ring; 5 is the flexible sealing sheet; 6 is the self-locking buckle; 61 is the buckle male head; 62 is the spring; 7 is the positioning ball; 71 is the limit sleeve; 72 is the outer positioning groove; and 73 is the inner positioning groove. Detailed Implementation

[0047] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0048] Example 1

[0049] like Figure 1 and Figure 2 As shown, the inflation / deflation valve includes a housing 1, an end cap 11, and a valve core 2. The end cap 11 covers the outer port of the housing 1, and the valve core 2 is fixed inside the housing 1. The valve core 2 can be integrated with the housing 1 or it can be separate, depending on the specific situation. In this embodiment, the valve core 2 and the housing 1 are separate structures. The valve core 2 passes through a slot inside the housing 1. The external air port 35 of the valve core 2 faces the side opposite to the external port of the housing 1, and the internal air port 37 of the valve core 2 faces the side opposite to the internal port of the housing 1. In this embodiment, the inflation / deflation valve is installed on a sponge inflation bed, and the housing 1 is fixedly connected to the sponge inflation bed. The outer port of the housing 1 can be connected to an air pump.

[0050] like Figures 3 to 9 As shown, the valve core 2 includes a valve body 3, a valve stem 4, and a flexible sealing plate 5. The valve body 3 has an air passage 33 inside, and the flexible sealing plate 5 is located inside the air passage 33 and fixedly connected to the valve stem 4. The outer end of the valve body 3 has an external air port 35 communicating with the air passage 33, and the inner end of the valve body 3 has an internal air port 37 communicating with the air passage 33. The valve body 3 has an annular external sealing surface 34 and an annular internal sealing surface 36 located at the outer end and the inner end, respectively. The external air port 35 is located inside the external sealing surface 34, and the internal air port 37 is located inside the internal sealing surface 36. The valve stem 4 can drive the flexible sealing plate 5 to move within the air passage 33, and the flexible sealing plate 5 can maintain a tight seal with the external sealing surface 34 or the internal sealing surface 36.

[0051] In this embodiment, the valve body 3 includes an upper valve body 31 and a lower valve body 32. The lower valve body 32 is cylindrical and has an air passage 33 inside. The inner diameter of the air passage 33 is larger than the diameter of the flexible sealing sheet 5. The upper valve body 31 covers the upper end of the lower valve body 32. An external air port 35 is opened on the upper valve body 31, and an external sealing surface 34 is located on the inner side of the upper valve body 31. An internal air port 37 is opened at the lower end of the lower valve body 32, and an internal sealing surface 36 is located on the inner side of the lower end of the lower valve body 32. The valve stem 4 passes through the upper valve body 31.

[0052] The flexible sealing sheet 5 is made of silicone, rubber or flexible plastic sheet. Preferably, in this embodiment, a flexible sealing sheet 5 made of silicone is used, which can deform in the direction of force when the flexible sealing sheet 5 is subjected to force.

[0053] In this embodiment, the outer sealing surface 34 is a frustum, and it slopes inward from the outer edge toward the outer air port 35. The inner sealing surface 36 is also a frustum, and it slopes inward from the outer edge toward the inner air port 37. During sealing, this is achieved by utilizing the deformed state of the flexible sealing sheet 5 to increase the sealing surface area, and during unidirectional ventilation, it facilitates the formation of a ventilation gap with the flexible sealing sheet 5.

[0054] In this embodiment, the valve stem 4 passes through the upper valve body 31 of the valve body 3 and is located inside the outer sealing surface 34. Specifically, the valve stem 4 passes through the center of the valve body 3. There are multiple external air ports 35 and internal air ports 37, which are arranged in a circumferential array around the axis of the valve body 3. The outer sealing surface 34 surrounds the external air ports 35 on the inner side, and the inner sealing surface 36 surrounds the internal air ports 37 on the inner side. The section of the valve stem 4 located inside the valve body 3 is provided with an annular groove. The flexible sealing sheet 5 is circular, with an opening in the middle of the flexible sealing sheet 5 and fitting into the annular groove.

[0055] Furthermore, a press-locking mechanism is provided between the valve stem 4 and the valve body 3, which enables the flexible sealing sheet 5 to maintain a tight seal with the outer sealing surface 34 and the inner sealing surface 36 respectively. In this embodiment, the self-locking mechanism includes a self-locking buckle 6, a buckle male head 61, and a spring 62. The valve stem 4 passes through the upper valve body 31 of the valve body 3, with the inner end of the valve stem 4 located inside the valve body 3. The buckle male head 61 is fixed to the end of the inner end of the valve stem 4. In this embodiment, the buckle male head 61 and the valve stem 4 are integrally formed. The self-locking buckle 6 is fixedly installed in the lower end of the lower valve body 32 and is directly opposite to the buckle male head 61. The spring 62 is sleeved on the section of the valve stem 4 located outside the valve body 3. One end of the spring 62 abuts against the upper valve body 31. The outer end of the valve stem 4 is provided with a protruding ring 41, and the other end of the spring 62 abuts against the protruding ring 41. When the self-locking buckle 6 and the buckle male head 61 are locked, the spring 62 is compressed and the flexible sealing sheet 5 is in contact with the inner sealing surface 36 for sealing. When the flexible sealing sheet 5 is in contact with the outer sealing surface 34 for sealing, the spring 62 is pressed against the outer end of the valve stem 4. Self-locking buckle 6 and buckle male connector 61 are currently available products on the market.

[0056] The valve stem 4 has a push button at one end located outside the valve body 3. The movement of the valve stem 4 is controlled by pressing it. When the valve stem 4 is pressed, it overcomes the elastic force of the spring 62 and moves the valve stem 4 towards the inside of the valve body 3. The flexible sealing sheet 5 moves to a position where it fits and seals with the inner sealing surface 36. At this time, the self-locking buckle 6 and the buckle male 61 lock, so that the flexible sealing sheet 5 and the inner sealing surface 36 remain in close contact and seal. When the valve stem 4 is pressed again, the self-locking buckle 6 and the buckle male 61 unlock. Under the action of the elastic force of the spring 62, the valve stem 4 moves back to the outside of the valve body 3 and resets. The valve stem 4 moves to a position where the flexible sealing sheet 5 fits and seals with the outer sealing surface 34. At this time, the spring 62 is still pressed on the valve stem 4, so that the flexible sealing sheet 5 and the outer sealing surface 34 remain in close contact and seal.

[0057] When inflation is required, adjust the flexible sealing sheet 5 to a position where it is in contact with and sealed against the outer sealing surface 34. The air pump pumps air into the outer casing 1. At this time, the pressure outside the outer air port 35 is greater than the pressure inside the air passage 33. The flexible sealing sheet 5 deforms under the air pressure, and air enters the air passage 33 through the gap formed between the deformed flexible sealing sheet 5 and the outer sealing surface 34, and then enters the sponge air bed through the inner air port 37 to achieve inflation. When inflation is complete, the air pump is turned off. At this time, the pressure inside the air passage 33 is greater than the pressure outside the outer air port 35, and the flexible sealing sheet 5 returns to its original position and seals the outer air port 35 to prevent air leakage. When deflation is required, press the valve rod 4, and the flexible sealing sheet 5 moves to a position where it is in contact with the inner sealing surface 36. At this position, the pressure inside the sponge air bed is greater than the pressure inside the air passage 33. The flexible sealing sheet 5 deforms, and the air inside the sponge air bed enters the air passage 33 through the gap formed between the deformed flexible sealing sheet 5 and the inner sealing surface 36. The venting of the sponge air bed can be completed by air pumping. When the air is completely vented, the pressure inside the sponge air bed is less than the pressure inside the air passage 33, and the sponge inside the sponge air bed is completely compressed. The flexible sealing sheet 5 returns to its original position and seals the inner air port 37. The flexible sealing sheet 5 being kept in this position can prevent outside air from re-entering the sponge air bed due to the elasticity of the sponge in the sponge air bed, so that the sponge air bed is kept in a compressed state, which is convenient for storage and handling.

[0058] Example 2

[0059] This embodiment is basically the same in structure and principle as Embodiment 1, except that the valve stem passes through the outer end of the valve body and is located outside the outer sealing surface. A fixing clip is fixed to a section of the valve stem inside the valve body, and the fixing clip clamps the flexible sealing sheet. In this structure, the valve stem is located outside the inner and outer sealing surfaces. The flexible sealing sheet includes a sealing part that can seal with the inner or outer sealing surface and a connecting part that protrudes from the sealing part. The fixing clip clamps onto the connecting part of the flexible sealing sheet to achieve a fixed connection.

[0060] Example 3

[0061] The structure and principle of this embodiment are basically the same as those of Embodiment 1, except that the outer sealing surface and / or the inner sealing surface are planar.

[0062] Example 4

[0063] This embodiment is basically the same as embodiment one in structure and principle, except that: Figure 10 and Figure 11As shown, the self-locking mechanism includes a self-locking buckle 6, a buckle male head 61, and a spring 62. The valve stem 4 passes through the outer end of the valve body 3, and the inner end of the valve stem 4 is located inside the valve body 3. The inner end of the valve stem 4 is provided with a fixing groove. The main body of the self-locking buckle 6 is fixedly installed in the fixing groove. The buckle male head 61 is fixed inside the valve body 3 and faces the self-locking buckle 6. The spring 62 is set inside the valve body 3. One end of the spring 62 abuts against the valve stem 4, and the other end of the spring 62 abuts against the inner end of the valve body 3. When the self-locking buckle 6 and the buckle male head 61 are locked, the spring 62 is compressed and the flexible sealing sheet 5 is in contact with the inner sealing surface 36 for sealing. When the flexible sealing sheet 5 is in contact with the outer sealing surface 34 for sealing, the spring 62 is pressed against the valve stem 4.

[0064] The valve stem 4 has a push button at one end located outside the valve body 3. Pressing the button controls the movement of the valve stem 4. When the valve stem 4 is pressed, it overcomes the spring force of the spring 62, causing the valve stem 4 to move inwards towards the valve body 3. The flexible sealing sheet 5 moves to a position where it is in contact with the inner sealing surface 36 for sealing. At this point, the self-locking buckle 6 and the buckle male 61 lock, ensuring the flexible sealing sheet 5 remains in contact with the inner sealing surface 36 for sealing. Pressing the valve stem 4 again unlocks the self-locking buckle 6 and the buckle male 61, allowing the spring force of the spring 62 to release the lock. The valve stem 4 is moved to the outer end of the valve body 3 to reset. The valve stem 4 moves to the position where the flexible sealing sheet 5 is in contact with the outer sealing surface 34. At this time, the spring 62 is still pressed on the valve stem 4, so that the flexible sealing sheet 5 and the outer sealing surface 34 remain in contact and sealed. The self-locking buckle 6 and the spring 62 cooperate to press the valve stem 4 to control the conversion of the unidirectional air passage direction of the valve core 2. After pressing, the flexible sealing sheet 5 can be automatically locked in the state of contact and sealing with the outer sealing surface 34 or the inner sealing surface 36.

[0065] Example 5

[0066] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that: the self-locking mechanism includes a ball and a spring, the outer end of the valve body is provided with a guide sleeve, the inner wall of the guide sleeve is provided with an annular groove along the circumference, the groove includes staggered high tooth grooves and low tooth grooves, the high tooth grooves and low tooth grooves are arranged at different heights, a guide surface is provided between the high tooth grooves and low tooth grooves, the valve stem passes through the guide sleeve, the valve stem has an annular groove, the ball is disposed between the annular groove and the groove, the spring is disposed in the valve body, one end of the spring abuts against the valve stem, the other end of the spring abuts against the inner end of the valve body, when the ball is in the high tooth groove, the flexible sealing sheet is in contact with the outer sealing surface for sealing, when the ball is in the low tooth groove, the flexible sealing sheet is in contact with the inner sealing surface for sealing. When the valve stem is pressed, the ball passes through the guide surface and enters from the high tooth groove to the low tooth groove. When the valve stem is pressed again, the ball passes through the guide surface and enters the next low tooth groove. This process is repeated, and the ball rolls around the annular groove. At the same time, the high and low tooth grooves drive the valve stem to move back and forth. The spring is always pressed on the valve stem, so that the ball can be kept in the high or low tooth groove. This allows the flexible sealing sheet to keep in close contact with the inner or outer sealing surface and achieve a seal. After pressing, the flexible sealing sheet can be automatically locked in a state of close contact with the outer or inner sealing surface.

[0067] Example 6

[0068] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the self-locking mechanism can also adopt the pressing structure used in ballpoint pens.

[0069] Example 7

[0070] This embodiment is basically the same as embodiment one in structure and principle, except that: Figure 12 and Figure 13As shown, a pressure-pull locking mechanism is provided between the valve stem 4 and the valve body 3, which enables the flexible sealing sheet 5 to maintain a tight seal with the outer sealing surface 34 and the inner sealing surface 36 respectively. The pressure-pull locking mechanism includes a positioning ball 7. A limiting sleeve 71 is provided at the inner end of the valve body 3. The valve stem 4 passes through the outer end of the valve body 3, and the lower section of the valve stem 4 passes through the limiting sleeve 71. An outer positioning groove 72 and an inner positioning groove 73 are provided on the limiting sleeve 71 at intervals along the axial direction of the valve body 3. The positioning ball 7 is installed on the lower section of the valve stem 4. When the valve stem 4 moves up and down, the positioning ball 7 can be engaged in the outer positioning groove 72 and the inner positioning groove 73 respectively. Pressing the valve stem 4 inward or pulling it outward allows the valve stem 4 to move the flexible sealing sheet 5 within the air passage 33. When pressed inward to the desired position, the positioning ball 7 engages with the inner positioning groove 73, at which point the flexible sealing sheet 5 and the inner sealing surface 36 are in contact and sealed. The positioning ball 7 ensures that the flexible sealing sheet 5 and the inner sealing surface 36 remain in contact and sealed. When pulled outward to the desired position, the positioning ball 7 engages with the outer positioning groove 72, at which point the flexible sealing sheet 5 and the outer sealing surface 34 are in contact and sealed. The positioning ball 7 ensures that the flexible sealing sheet 5 and the outer sealing surface 34 remain in contact and sealed.

[0071] Example 8

[0072] This embodiment is basically the same as Embodiment 1 in structure and principle, except that a pressure-pull locking mechanism is provided between the valve stem and the valve body to ensure that the flexible sealing sheet is in close contact with the outer sealing surface and the inner sealing surface, respectively. The pressure-pull locking mechanism includes a damping sleeve, a limiting sleeve at the inner end of the valve body, and two limiting protrusions spaced axially along the inner wall of the limiting sleeve. The valve stem passes through the outer end of the valve body, and the lower section of the valve stem passes through the limiting sleeve. The damping sleeve is fixedly fitted on the lower section of the valve stem. When the valve stem moves up and down, the damping sleeve can be engaged in the two limiting protrusions respectively. Pressing the valve stem inward or pulling it outward causes the valve stem to move the flexible sealing plate within the air passage. When pressed inward to the desired position, the damping sleeve engages with the outermost limiting protrusion ring, at which point the flexible sealing plate is in contact with the inner sealing surface for a seal. When pulled outward to the desired position, the damping sleeve engages with the innermost limiting protrusion ring, at which point the flexible sealing plate is in contact with the outer sealing surface for a seal. The friction between the damping sleeve and the limiting protrusion ring allows the flexible sealing plate to maintain a seal with both the outer and inner sealing surfaces.

[0073] Example 9

[0074] This embodiment is basically the same in structure and principle as Embodiment 1, except that a rotary locking mechanism is provided between the valve stem and the valve body to ensure that the flexible sealing sheet is in contact with the outer sealing surface and the inner sealing surface respectively. The rotary locking mechanism includes a threaded section on the valve stem and a threaded hole on the outer end of the valve body. The threaded section of the valve stem is screwed into the threaded hole of the valve stem. Limiting nuts are connected to both ends of the threaded section on the valve stem, one of which is located inside the valve body and the other is located outside the valve body. By rotating the valve stem, the valve stem can move the flexible sealing sheet within the air passage. The two limiting nuts limit the stroke of the valve stem. When the limiting nut inside the valve body abuts against the valve body, the flexible sealing sheet is in contact with the outer sealing surface. When the limiting nut outside the valve body abuts against the valve body, the flexible sealing sheet is in contact with the inner sealing surface. The screwed connection between the valve stem and the valve body has a self-locking function, which allows the flexible sealing sheet to maintain contact with either the outer or inner sealing surface. In use, simply rotate one end of the valve stem that protrudes from the valve body.

[0075] Example 10

[0076] This embodiment is basically the same as the first embodiment in terms of structure and principle. The difference is that a rotary locking mechanism is provided between the valve stem and the valve body, which enables the flexible sealing sheet to keep in contact and seal with the outer sealing surface and the inner sealing surface respectively. The rotary locking mechanism includes a steel ball and a spring. A limiting sleeve is provided at the inner end of the valve body. Guide grooves are respectively formed on the inner wall of the limiting sleeve. Each guide groove includes an outer positioning section, an inner positioning section, a linear reset section, and a spiral guide section. Both the outer and inner positioning sections are circumferentially arranged arc segments, with the arc of the outer positioning section being smaller than that of the inner positioning section. The outer positioning section is located at the inner end of the limiting sleeve, and the inner positioning section is located at the outer end of the limiting sleeve. One end of the outer positioning section is aligned with one end of the inner positioning section and connected by the linear reset section. The spiral guide section connects the other ends of the outer and inner positioning sections. The spring is disposed within the valve body, with one end abutting against the valve stem and the other end abutting against the inner end of the valve body. The valve stem passes through the outer end of the valve body, and its lower section passes through the limiting sleeve. The steel ball is rolled and connected to the outer wall of the lower section of the valve stem, and is also rolled and connected in the guide groove. When the valve stem is rotated, the steel ball rolls along the guide groove. When the steel ball is in the outer positioning section, the flexible sealing plate is in contact with the outer sealing surface for sealing. When the steel ball is in the inner positioning section, the flexible sealing plate is in contact with the inner sealing surface for sealing. During use, by rotating the valve stem, the steel ball enters the spiral guide section from the outer positioning section. Under the guidance of the spiral guide section, the valve stem moves towards the inner end of the valve body, driving the flexible sealing plate to move towards the inner sealing surface. When the steel ball moves to the inner positioning section, the flexible sealing plate moves to the position where it is in contact with the inner sealing surface for sealing. Simply keeping the steel ball in the inner positioning section is enough to maintain the seal. When switching the ventilation direction, continue rotating the valve stem to move the steel ball to the position aligned with the linear reset section. At this time, under the action of the spring, the steel ball will move along the linear reset section to the outer positioning section, so that the valve stem returns to the position where the flexible sealing plate is in contact with the outer sealing surface for sealing.

[0077] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A valve core, comprising a valve body (3), a valve stem (4), and a flexible sealing sheet (5), wherein the valve body (3) has an air passage (33), and the flexible sealing sheet (5) is disposed within the air passage (33) and fixedly connected to the valve stem (4), characterized in that, The valve body (3) has an external air port (35) communicating with the air passage (33) at its outer end and an internal air port (37) communicating with the air passage (33) at its inner end. The valve body (3) has an annular external sealing surface (34) and an annular internal sealing surface (36) at its outer and inner ends, respectively. The external air port (35) is located inside the external sealing surface (34) and the internal air port (37) is located inside the internal sealing surface (36). The valve stem (4) can drive the flexible sealing sheet (5) to move in the air passage (33). The flexible sealing sheet (5) can keep in close contact with the external sealing surface (34) or the internal sealing surface (36).

2. The valve core according to claim 1, characterized in that, The outer sealing surface (34) is a frustum, and the outer sealing surface (34) is inclined inward from the outer edge toward the outer air port (35).

3. The valve core according to claim 1, characterized in that, The inner sealing surface (36) is a frustum, and the inner sealing surface (36) is inclined inward from the outer edge toward the inner air port (37).

4. The valve core according to claim 1, characterized in that, The flexible sealing sheet (5) is made of silicone, rubber or flexible plastic sheet.

5. The valve core according to any one of claims 1 to 4, characterized in that, The valve stem (4) passes through the outer end of the valve body (3) and is located inside the outer sealing surface (34).

6. The valve core according to claim 5, characterized in that, The valve stem (4) has an annular groove on a section inside the valve body (3), and the flexible sealing sheet (5) is fitted into the annular groove.

7. The valve core according to any one of claims 1 to 4, characterized in that, The valve stem (4) passes through the outer end of the valve body (3) and is located outside the outer sealing surface (34).

8. The valve core according to claim 7, characterized in that, A fixing clip is fixed on a section of the valve stem (4) located inside the valve body (3), and the fixing clip clamps the flexible sealing sheet (5).

9. The valve core according to any one of claims 1 to 4, characterized in that, A self-locking mechanism is provided between the valve stem (4) and the valve body (3) to ensure that the flexible sealing sheet (5) is in close contact with the outer sealing surface (34) and the inner sealing surface (36) respectively.

10. The valve core according to claim 9, characterized in that, The self-locking mechanism includes a self-locking buckle (6), a buckle male head (61), and a spring (62). The valve stem (4) passes through the outer end of the valve body (3), and the inner end of the valve stem (4) is located inside the valve body (3). The buckle male head (61) is fixed to the end of the inner end of the valve stem (4). The self-locking buckle (6) is fixedly installed inside the valve body (3) and faces the buckle male head (61). The spring (62) is sleeved on the valve stem (4) located inside the valve body. (3) On the outer section, one end of the spring (62) abuts against the valve body (3), and the other end of the spring (62) abuts against the outer end of the valve stem (4). When the self-locking buckle (6) and the buckle male head (61) are locked, the spring (62) is compressed and the flexible sealing sheet (5) is sealed with the inner sealing surface (36). When the flexible sealing sheet (5) is sealed with the outer sealing surface (34), the spring (62) is pressed against the outer end of the valve stem (4).

11. The valve core according to claim 9, characterized in that, The self-locking mechanism includes a ball and a spring (62). The outer end of the valve body (3) is provided with a guide sleeve. The inner wall of the guide sleeve is provided with an annular groove along the circumference. The groove includes staggered high tooth grooves and low tooth grooves. The high tooth grooves and low tooth grooves are arranged at different heights. A guide surface is provided between the high tooth grooves and low tooth grooves. The valve stem (4) passes through the guide sleeve. An annular groove is opened on the valve stem (4). The ball is disposed between the annular groove and the groove. The spring (62) is disposed inside the valve body (3). One end of the spring (62) abuts against the valve stem (4). The other end of the spring (62) abuts against the inner end of the valve body (3). When the ball is located in the high tooth groove, the flexible sealing sheet (5) is in contact with the outer sealing surface (34) for sealing. When the ball is located in the low tooth groove, the flexible sealing sheet (5) is in contact with the inner sealing surface (36) for sealing.

12. The valve core according to any one of claims 1 to 4, characterized in that, A pressure-pull locking mechanism is provided between the valve stem (4) and the valve body (3) to ensure that the flexible sealing sheet (5) is in close contact with the outer sealing surface (34) and the inner sealing surface (36) respectively.

13. The valve core according to claim 12, characterized in that, The press-pull locking mechanism includes a positioning ball (7), and the inner end of the valve body (3) is provided with a limiting sleeve (71). The valve stem (4) passes through the outer end of the valve body (3) and the lower section of the valve stem (4) passes through the limiting sleeve (71). The limiting sleeve (71) is provided with an outer positioning groove (72) and an inner positioning groove (73) spaced apart along the axial direction of the valve body (3). The lower section of the valve stem (4) is equipped with a positioning ball (7). When the valve stem (4) moves up and down, the positioning ball (7) can be inserted into the outer positioning groove (72) and the inner positioning groove (73) respectively.

14. The valve core according to claim 12, characterized in that, The press-pull locking mechanism includes a damping sleeve. The inner end of the valve body (3) is provided with a limiting sleeve (71). Two limiting protrusions (41) are provided on the inner wall of the limiting sleeve (71) along the axial direction of the valve body (3). The valve stem (4) passes through the outer end of the valve body (3) and the lower section of the valve stem (4) passes through the limiting sleeve (71). The damping sleeve is fixedly sleeved on the lower section of the valve stem (4). When the valve stem (4) moves up and down, the damping sleeve can be respectively engaged in the two limiting protrusions (41).

15. The valve core according to any one of claims 1 to 4, characterized in that, A rotary locking mechanism is provided between the valve stem (4) and the valve body (3) to ensure that the flexible sealing sheet (5) is in close contact with the outer sealing surface (34) and the inner sealing surface (36) respectively.

16. The valve core according to claim 15, characterized in that, The rotary locking mechanism includes a threaded section on the valve stem (4) and a threaded hole on the outer end of the valve body (3). The threaded section of the valve stem (4) is screwed into the threaded hole of the valve stem (4). Limiting nuts are connected to both ends of the threaded section on the valve stem (4). One limiting nut is located inside the valve body (3), and the other limiting nut is located outside the valve body (3).

17. The valve core according to claim 15, characterized in that, The rotary locking mechanism includes a steel ball and a spring (62). The inner end of the valve body (3) is provided with a limiting sleeve (71). The inner wall of the limiting sleeve (71) is provided with guide grooves. The guide grooves include an outer positioning section, an inner positioning section, a linear reset section, and a spiral guide section. The outer positioning section and the inner positioning section are both circumferentially arranged arc segments, and the arc of the outer positioning section is smaller than that of the inner positioning section. The outer positioning section is located at the inner end of the limiting sleeve (71), and the inner positioning section is located at the outer end of the limiting sleeve (71). One end of the outer positioning section is aligned with one end of the inner positioning section and connected by the linear reset section. The spiral guide section connects the other ends of the outer positioning section and the inner positioning section. The spring (62) is disposed inside the valve body (3). One end of the spring (62) abuts against the valve stem (4), and the other end of the spring (62) abuts against the inner end of the valve body (3). The valve stem (4) passes through the outer end of the valve body (3), and the lower section of the valve stem (4) passes through the limiting sleeve (71). The steel ball is rolled on the outer wall of the lower section of the valve stem (4) and rolled in the guide groove.

18. A charge / discharge valve, comprising a housing (1) and an end cap (11), the end cap (11) covering the outer port of the housing (1), characterized in that, It also includes the valve core (2) according to any one of claims 1 to 17, wherein the valve core (2) is fixedly installed inside the housing (1), the external air port (35) of the valve core (2) faces the side of the external port of the housing (1), and the internal air port (37) of the valve core (2) faces the side of the internal port of the housing (1).

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