Valve and fluid pump

Abstract

The invention relates to the technical field of pumps with electric drive, in particular to a valve and a fluid pump, the valve comprises a bottom plate with a bottom plate hole part, a cover plate with a cover plate hole part, a valve plate and a supporting plate with an air leakage channel, the bottom plate, the supporting plate and the cover plate are sequentially stacked, the middle of the supporting plate is hollowed out, and a valve chamber is formed between the bottom plate and the cover plate; the valve plate is arranged in the valve chamber, the thickness of the valve plate is smaller than that of the supporting plate, an air leakage gap is formed, the air leakage channel is communicated with the valve chamber and the air leakage gap and arranged on the periphery of the supporting plate, at least one unclosed parting line is arranged on the valve plate, and the valve plate can deform under the blowing action of air, so that an air port is formed in the area where the parting line is located. The bottom plate hole part, the cover plate hole part and the air port are oppositely arranged, a movable valve is formed in the area where the parting line is located, and the valve and the valve plate part are connected to form a connecting line. According to the valve, through the air inlet valve, the air outlet valve and the valve which are oppositely arranged, the miniaturization, lightening and thinning of a product are achieved, meanwhile, plugging and air leakage of a lateral gap are conducted, the air leakage speed is high, the risk of plugging failure is reduced, and the product reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps driven by electricity, and more particularly to a valve and a fluid pump. Background Art

[0002] The advent of intelligent wearable devices such as wrist-type and arm-type sphygmomanometers has greatly facilitated people's lives, and thus has been favored by the market. As the core components thereof, the micro air pump and the air release valve have also received extensive attention in the industry. Improving the performance of the micro air pump and the air release valve has become a key factor in improving the product performance. In order to achieve miniaturization in structure, the air release valve applied to intelligent wearable devices mostly adopts a diaphragm structure. The diaphragm deforms due to the flow of the fluid, and divides the internal space of the housing into an air inlet side and an air outlet side.

[0003] After retrieval, the patent with the publication number of CN117280149A discloses a valve, a fluid control device, a pressurizing device and a sphygmomanometer. By using a communication path to connect the first wall side space and the second wall side space, it is possible to suppress the rapid change of the flow path cross-sectional area and the change of the flow velocity of the first flow path, so as to suppress the vibration of the membrane. However, it is found in the actual use process that when the pump stops being powered on and deflates in the reverse direction, the gas can only be discharged through the hole 790. Due to the limited flow area, the deflation speed is slow. For wrist-type and arm-type sphygmomanometers, as well as the massage industry, the too long pressure relief time will cause a poor user experience. At the same time, for the single-hole pressure relief structure, once impurities enter, the risk of blockage will be greatly increased, and the reliability is low; when the pump is powered on and works to discharge gas in the forward direction, after the gas pushes open the valve piece 80, it needs to make two turns before flowing out from the hole 800. This process increases the frictional resistance along the way and the local resistance, resulting in the attenuation of the output gas pressure and flow rate of the air pump. Summary of the Invention

[0004] In order to solve the problems of slow deflation speed and easy blockage caused by the limited flow area of the existing single-hole pressure relief, the present invention provides a valve and a fluid pump. Through the opposed air inlet, air outlet and movable valve, while realizing the miniaturization and lightness of the product, the lateral gap is blocked and deflated, the deflation speed is fast, the risk of blockage failure is reduced, and the product reliability is improved.

[0005] The present invention provides a valve, which includes a bottom plate with a bottom plate hole portion, a cover plate with a cover plate hole portion, a valve sheet, and a support plate with at least one air leakage channel. The bottom plate, the support plate, and the cover plate are stacked in sequence. The middle of the support plate is hollowed out, so as to form a valve chamber between the bottom plate and the cover plate. The valve sheet is placed in the valve chamber and its thickness is less than the height of the valve chamber, forming an air leakage gap. The air leakage channel communicates with the valve chamber and the air leakage gap and is arranged at the outer peripheral part of the support plate. At least one unclosed dividing line is provided on the valve sheet. The valve sheet can bulge and deform under the action of gas blowing, so that an air port is formed in the area where the dividing line is located. The bottom plate hole portion, the cover plate hole portion, and the air port are opposed to each other. By providing a dividing line on the valve sheet, while realizing the forward flow of gas, the gas flowing in the reverse direction can be completely prevented from entering or very little can enter between the bottom plate and the valve sheet, that is, it does not affect the blocking of the bottom plate hole portion by the valve sheet, so as to ensure the normal use of the valve.

[0006] Further, the area where the dividing line is located forms a movable valve flap. The valve flap is partially connected to the valve sheet and forms a connecting line. The dividing line and the connecting line are connected end to end to form a closed line, and the length of the dividing line is not less than the length of the connecting line. In the initial state, the valve flap and the valve sheet are in the same plane. Only when the valve sheet deforms, the valve flap will open to form an air port for gas to flow through.

[0007] Further, the valve sheet is circular. The valve sheet sequentially includes a flow area, a blocking area, and an adhesive area from the center of the circle outwards. The valve sheet is fixed on the bottom plate through the adhesive area. The blocking area is used to circumferentially block the air leakage gap of the support plate, and the valve flap is arranged in the flow area. The flow area, the blocking area, and the adhesive area are concentrically arranged. The thickness of the blocking area is less than the thickness of the support plate, forming an air leakage gap in the valve chamber. Thus, when gas flows in forward, the blocking area can completely block the circumferential air leakage gap.

[0008] Further, the bottom plate hole portion is a single hole opened at the center of the bottom plate or a hole group composed of multiple holes opened at the center of the bottom plate. When gas flows in reverse, even if the valve flap is opposite to the bottom plate hole portion, it will not affect the normal air leakage.

[0009] Further, the bottom plate hole portion is annular, and a blocking plate opposed to the flow area is formed in the middle area of the annular bottom plate hole portion. During the air leakage process, the valve sheet adheres to the bottom plate due to the thrust of the reverse air flow. At this time, the valve flap area closely adheres to the blocking plate, which can effectively prevent gas from flowing back into the pump body from the valve flap.

[0010] Further, the bottom plate hole portion is composed of several air inlet holes, and the several air inlet holes are circumferentially evenly distributed with the center of the valve sheet as the center of the circle. Thus, the valve sheet is uniformly stressed to completely block the circumferential air leakage gap to prevent gas leakage.

[0011] Further, the air inlet hole is a fan-shaped hole, a curved kidney-shaped hole, or a curved square hole. The circular valve sheet is matched with the curved strip-shaped air inlet hole, and the blocking or air inlet effect is better.

[0012] Further, the valve plate is fixed on the bottom plate around the hole part of the bottom plate through the bonding area, so that the flow area and the blocking area of the valve plate are attached to the bottom plate; when gas flows in from the hole part of the bottom plate, the flow area and the blocking area of the valve plate attached to the bottom plate are elastically deformed by the gas towards the cover plate side and attached to the periphery of the hole part of the cover plate, thereby blocking the air leakage gap and preventing the gas from flowing into the valve chamber, and further preventing the gas from flowing out from the air leakage channel; when the gas flows in reversely from the hole part of the cover plate, the air port is closed, and under the push of the reversely flowing gas, the flow area and the blocking area of the valve plate move towards the bottom plate side, the valve plate is pushed against the bottom plate and blocks the hole part of the bottom plate, and the air leakage gap is opened. At this time, the gas is discharged from the air leakage channel through the air leakage gap and the valve chamber, realizing the air leakage function. When the height of the support plate is appropriately greater than the thickness of the valve plate and an appropriate air leakage gap space is formed, the air leakage speed is fast and the effect is good.

[0013] Further, a convex platform is arranged on the side of the blocking plate facing the valve plate, and the diameter of the convex platform is smaller than the inner diameter of the annular bottom plate hole part. The blocking effect of the bottom plate hole part during air leakage can be optimized. Of course, the convex platform can also be arranged on the valve plate.

[0014] Further, a convex ring is arranged on the side of the cover plate facing the valve plate, and the convex ring is arranged on the periphery of the hole part of the cover plate. The blocking effect of the air leakage gap and the air leakage channel during forward air outlet can be optimized. Of course, the convex ring can also be arranged on the valve plate.

[0015] A fluid pump includes a pump and a valve. The pump and the valve share a bottom plate, and the pump has a pump chamber communicated with the hole part of the bottom plate. By controlling the gas flow in the valve through the pump, since the area of the air leakage channel in the valve becomes larger, it is not easy to generate airflow whistling, that is, the noise can be reduced.

[0016] The beneficial effects of the present invention are as follows: The present invention provides a valve and a fluid pump, (1) Air leakage is carried out through the lateral gap, the air leakage area is greatly increased, the air leakage speed is improved, and it is more suitable for wrist-type and arm-type sphygmomanometers and massager products to meet a better user experience. At the same time, the risk of failure due to the entry of impurities can be reduced, thereby improving the reliability of the product; (2) By opposing the hole part of the bottom plate, the hole part of the cover plate and the air port, the thickness dimension can be made very small. At the same time, there are fewer components and the structure is simple. The thickness is only less than one-half of that of other types of air leakage valves. The assembly is convenient, the cost is low, and the movement distance of the gas inside the valve body is extremely short and the along-way loss is small. There is no more flow channel structure causing local loss. Therefore, the flow resistance of the valve body is small. During the movement process, most of the area of the valve plate is supported by the bottom plate and the cover plate. The response time of the valve body is very short, ensuring the real-time output of the finished product. The movement size of the valve plate is small, the deformation is small, and it is not easy to be damaged, greatly improving the reliability of the product, and more conforming to the trend of miniaturization and lightness and thinness in industries such as 3C and personal wear; (3) By changing the air holes on the traditional valve plate into movable valves, when gas flows reversely into the valve through the holes in the cover plate, the gas cannot enter or can only enter very little between the bottom plate and the valve plate, which can ensure that the valve plate is in contact with the bottom plate and the holes in the bottom plate are blocked, thus effectively preventing gas backflow and improving the sealing performance of the valve. Brief Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Figure 1 It is a structural diagram of an existing valve; Figure 2 It is a sectional view of the existing valve in the state where the pump is powered off (the arrow represents the gas flow direction); Figure 3 It is a schematic diagram of various dividing lines; Figure 4 It is a schematic diagram of the valve plate in a static state; Figure 5 It is a schematic diagram of the valve plate in a bulging state; Figure 6 It is a sectional view of the valve in a static state; Figure 7 It is a sectional view of the valve in the state where the pump is powered on (the arrow represents the gas flow direction); Figure 8 It is a sectional view of the valve in the state where the pump is powered off (the arrow represents the gas flow direction); Figure 9 It is a schematic diagram of the bottom plate hole part without a sealing plate; Figure 10 It is a schematic diagram of the bottom plate hole part with a sealing plate; Figure 11 It is a schematic diagram of the bottom plate with a boss; Figure 12 It is a schematic diagram of the cover plate with a convex ring; Figure 13 It is a structural schematic diagram of a fluid pump; In the figures: 1. Bottom plate, 11. Bottom plate hole part, 12. Sealing plate, 13. Boss, 2. Valve plate, 21. Dividing line, 22. Valve, 23. Flow area, 24. Sealing area, 25. Bonding area, 26. Valve plate hole part, 3. Support plate, 31. Air leakage channel, 32. Valve chamber, 33. Air leakage gap, 4. Cover plate, 41. Cover plate hole part, 42. Convex ring, 5. Pump, 51. Pump chamber. Specific Embodiments

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0019] As Figure 1 and 2 shown, it is the structure of an existing single-hole air release valve, including a bottom plate 1 having a bottom plate hole portion 11, a cover plate 4 having a cover plate hole portion 41, a valve piece 2, and a support plate 3 having an air release channel 31. The bottom plate 1, the support plate 3, and the cover plate 4 are stacked in sequence. The middle of the support plate 3 is hollowed out, so that a valve chamber 32 is formed between the bottom plate 1 and the cover plate 4. The valve piece 2 is placed in the valve chamber 32 and its thickness is less than the height of the valve chamber 32, forming an air release gap 33. The air release channel 31 communicates with the valve chamber 32 and the air release gap 33 and is provided on the outer peripheral portion of the support plate 3.

[0020] When the pump 5 is powered on and working, gas enters the bottom plate hole portion 11 from the outlet of the pump chamber 51, pushes the valve piece 2 to adhere to the plane around the cover plate hole portion 41, closes the air release gap 33, and realizes lateral sealing. Compared with the previous sealing hole, the lateral sealing here is the annular height space of the entire air release gap 33, that is, the gap between the bottom plate 1 and the cover plate 4. At this time, the gas cannot flow from the air release channel 31 of the support plate 3 to the external space, and can only flow out from the cover plate hole portion 41 of the cover plate 4 and be injected into the external airbag; when the pump 5 is powered off and stops working, the gas in the airbag is deflated under the action of the airbag elasticity. The gas flows reversely into the cover plate hole portion 41, pushes the valve piece 2 to adhere to the opposing sealing plate 12, realizes the sealing of the valve piece hole portion 26, and opens the air release gap 33. At this time, the gas cannot flow through the valve piece hole portion 26 on the valve piece 2 to the pump outlet, and can only flow out from the lateral air release gap 33 and the air release channel 31.

[0021] Specifically, the valve piece 2 is provided with a valve piece hole portion 26 at the central position. When the gas flows reversely into the cover plate hole portion 41 for deflation, part of the gas will flow into the space between the valve piece 2 and the bottom plate 1 through the valve piece hole portion 26, causing the valve piece 2 to bulge towards the cover plate 4 side. The air release gap 33 cannot be completely opened, seriously reducing the deflation speed and prolonging the deflation time, thereby affecting the normal use of the fluid pump 5.

[0022] In order to solve the above problems, the technical solution needs to change the structure of the existing valve piece hole portion 26, that is, when the gas flows reversely into the cover plate hole portion 41, the gas flowing into the space between the valve piece 2 and the bottom plate 1 through the valve piece hole portion 26 is extremely small or completely absent, so that the valve piece 2 and the bottom plate 1 can be completely attached and the air release gap 33 can be completely opened. At this time, the gas can only be discharged from the circumferential air release gap 33 and the air release channel 31, ensuring the normal use of the pump 5.

[0023] The core of the technical solution is that, as Figure 3As shown, the original valve plate hole portion 26 is cancelled, and at least one unclosed dividing line 21 is provided on the valve plate 2. The valve plate 2 can be deformed under the push of gas, so that an air port is formed in the area where the dividing line 21 is located, and the bottom plate hole portion 11, the cover plate hole portion 41 and the air port are opposed. The dividing line 21 can be one or more. A single dividing line 21 is unclosed, and when multiple dividing lines 21 do not intersect, multiple independent air ports can be formed. The dividing line 21 can be a regular straight line, an irregular curve or a broken line, such as an S shape, an L shape, a V shape, etc., or other unclosed geometric shapes.

[0024] Thus, when the pump 5 is powered on and working, gas enters the bottom plate hole portion 11 from the outlet of the pump chamber 51, pushes the valve plate 2 to elastically deform and attach to the plane around the cover plate hole portion 41, so that the blocking area 24 of the valve plate 2 laterally blocks the circumferential air leakage gap 33. The deformation and bulging of the valve plate 2 cause the dividing line 21 thereon to expand and form an air port. At this time, gas cannot flow from the air leakage channel 31 of the support plate 3 to the external space, and can only flow out from the cover plate hole portion 41 of the cover plate 4 through the air port on the valve plate 2; when the pump 5 is powered off and stops working, gas flows in reversely from the cover plate hole portion 41, continuously pushes the blocking area 24 on the valve plate 2 that was originally attached to the periphery of the cover plate hole portion 41 against the bottom plate 1, and the air leakage gap 33 is opened. Because the valve plate 2 has elasticity, after deformation and reset, the air port returns to the state of the dividing line 21, that is, the air port is closed. Therefore, the reversely flowing gas will not enter between the valve plate 2 and the bottom plate 1, which can ensure that the valve plate 2 completely adheres to the bottom plate 1. At this time, gas can only be discharged from the circumferential air leakage gap 33 and the air leakage channel 31 of the support plate 3.

[0025] As Figure 4 and 5 shown, preferably, a movable valve flap 22 is formed in the area where the dividing line 21 is located. The valve flap 22 is partially connected to the valve plate 2 to form a connecting line. The dividing line 21 and the connecting line are connected end to end to form a closed line, and the length of the dividing line 21 is not less than the length of the connecting line. The valve flap 22 is movably arranged on the valve plate 2. When the valve plate 2 is deformed by the push of gas, the valve flap 22 opens to form an air port. When the valve plate 2 is not blown by gas, the valve flap 22 and the valve plate 2 are in the same plane and the air port is closed. The setting of the cutting line 21 does not cause the loss of the material of the valve plate 2. The valve flap 22 has good sealing performance in the closed state, so that gas will not flow into the space between the valve plate 2 and the bottom plate 1, thereby ensuring that the valve plate 2 adheres to the bottom plate 1, that is, ensuring that gas is quickly discharged from the circumferential air leakage gap 33 and the air leakage channel 31 of the support plate 3 during the air leakage process.

[0026] As Figure 4 and 6As shown, preferably, the valve plate 2 is circular. The valve plate 2 sequentially includes a flow-through area 23, a blocking area 24, and an adhesive area 25 from the center of the circle outwards. The valve plate 2 is fixed on the bottom plate 1 through the adhesive area 25. The blocking area 24 is used to circumferentially block the air leakage gap 33 of the support plate 3, and the valve flap 22 is arranged in the flow-through area 23. The valve plate 2 is placed in the valve chamber 32 and its thickness is less than the height of the valve chamber 32, forming the air leakage gap 33. When the pump 5 is not powered on and working, the valve plate 2 closely adheres to the bottom plate 1, and the valve chamber 32 communicates with the air leakage gap 33 and the air leakage channel 31. The air leakage gap 33 can be regarded as a part of the valve chamber 32. The thickness of the support plate 3 (i.e., the gap between the bottom plate 1 and the cover plate 4) is extremely important, which determines the space for the up and down movement of the valve plate 2. The size of the blocking area 24 for blocking the circumferential air leakage gap 33 and the air leakage channel 31 of the support plate 3 is reasonably set according to the actual thickness of the support plate 3.

[0027] As Figure 7 shown, when the gas flows in from the bottom plate hole portion 11, the flow-through area 23 and the blocking area 24 of the valve plate 2 attached to the bottom plate 1 elastically deform towards the cover plate 4 side, so that the blocking area 24 blocks the circumferential air leakage gap 33 and the air leakage channel 31, and the valve flap 22 in the flow-through area 23 is opened to form an air port, and the air port communicates with the cover plate hole portion 41. At this time, the gas is discharged from the cover plate hole portion 41; As Figure 8 shown, when the gas flows in reversely from the cover plate hole portion 41, the valve plate 2 is pushed against the bottom plate 1 and blocks the bottom plate hole portion 11. At this time, the gas is discharged from the circumferential air leakage gap 33 and the air leakage channel 31 of the support plate 3.

[0028] The area of the air leakage gap 33 and the air leakage channel 31 is large, the air leakage speed is fast, and it is not easy to be blocked, greatly improving the air leakage reliability of the valve body; Since the air leakage area in the horizontal direction is very large, the dimension in the height direction can be further reduced, which is beneficial to the thin and light and miniaturized design of the 3C industry; And because the movement displacement and deformation of the valve plate 2 are small, the valve plate 2 is not easy to lose its life due to excessive deformation, and the reliability is high; At the same time, the area of the air leakage channel becomes larger, and it is not easy to generate airflow whistling sound, which can reduce the noise.

[0029] As Figure 9 shown, to achieve the opposed gas flow-through, that is, to further reduce the gas flow path, the bottom plate hole portion 11 can be a single hole opened at the center of the bottom plate 1 or a hole group composed of multiple holes opened at the center of the bottom plate 1, and there is no blocking plate 12 in this structure. When the gas flows in reversely from the cover plate hole portion 41, because the valve plate 2 is normally attached to the bottom plate 1, and in addition, the area of the air leakage gap 33 and the air leakage channel 31 is large and the flow rate is fast, therefore, even if the valve flap 22 in the flow-through area 23 of the valve plate 2 is opposite to the bottom plate hole portion 11 of the bottom plate 1, it will not cause a large amount of gas backflow, and the valve can still work normally.

[0030] As Figure 10As shown in the figure, in order to avoid the possible gas backflow caused by setting the bottom plate hole portion 11 at the center of the bottom plate 1, the bottom plate hole portion 11 can be set in a ring shape, and a blocking plate 12 opposed to the flow area 23 is formed in the middle area of the annular bottom plate hole portion 11. The bottom plate hole portion 11 is composed of a plurality of air inlet holes, and the plurality of air inlet holes are circumferentially uniformly distributed with the center of the valve plate 2 as the center of the circle. Preferably, the air inlet holes are fan-shaped holes, or curved kidney-shaped holes, or curved square holes. The outer diameter of the valve plate 2 is set to be 20% - 90% of the side length of one side of the bottom plate 1, and the thickness of the valve plate 2 is 0.002 - 2 mm, depending on the material characteristics. Through the cooperation of the curved arc holes and the circular valve plate 2, effective blocking can be achieved, and the blocking effect is good.

[0031] As Figure 11 shown in the figure, in order to optimize the blocking effect of the bottom plate hole portion 11 on the bottom plate 1 during air release, a convex platform 13 is provided on the side of the blocking plate 12 facing the valve plate 2. The diameter of the convex platform 13 is smaller than the inner diameter of the annular bottom plate hole portion 11. Of course, the convex platform 13 can also be provided on the valve plate 2.

[0032] As Figure 12 shown in the figure, in order to optimize the blocking effect of the air release gap 33 during forward air outlet, a convex ring 42 is provided on the side of the cover plate 4 facing the valve plate 2. The convex ring 42 is provided outside the cover plate hole portion 41 and is concentric with the cover plate hole portion 41. Of course, the convex ring 42 can also be provided on the valve plate 2.

[0033] As Figure 13 shown in the figure, a fluid pump includes a pump 5 and a valve. The pump 5 and the valve share a bottom plate 1, and the pump 5 has a pump chamber 51 communicated with the bottom plate hole portion 11. By energizing and de-energizing the pump 5, the gas flow is controlled.

[0034] The above description is illustrative rather than restrictive to the present invention. Those of ordinary skill in the art understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all of them will fall within the protection scope of the present invention.

Claims

1. A valve, comprising The bottom plate (1) has a bottom plate hole portion (11), The cover plate (4) has a cover plate hole portion (41), Valve plate (2), and The support plate (3) has at least one air release channel (31). The bottom plate (1), the support plate (3) and the cover plate (4) are stacked in sequence. The middle part of the support plate (3) is hollowed out so that a valve chamber (32) is formed between the bottom plate (1) and the cover plate (4); the valve plate (2) is placed in the valve chamber (32) and has a thickness less than the height of the valve chamber (32) to form an air leakage gap (33); the air leakage channel (31) is connected to the valve chamber (32) and the air leakage gap (33) and is arranged on the outer periphery of the support plate (3). Features: The valve plate (2) is provided with at least one unclosed dividing line (21), and the valve plate (2) can be expanded and deformed under the action of gas blowing, so that a gas port is formed in the area where the dividing line (21) is located, and the bottom plate hole portion (11), the cover plate hole portion (41) and the gas port are opposite to each other.

2. A valve according to claim 1, characterized in that: The area where the dividing line (21) is located forms a movable valve (22), the valve (22) is partially connected to the valve plate (2) to form a connecting line, the dividing line (21) and the connecting line are connected end to end to form a closed line, and the length of the dividing line (21) is not less than the length of the connecting line.

3. A valve according to claim 2, characterized in that: The valve plate (2) is circular, and comprises, from the center of the circle outward, a circulation area (23), a blocking area (24), and a bonding area (25), the valve plate (2) being fixed to the bottom plate (1) via the bonding area (25), the blocking area (24) being used for circumferentially blocking the air leakage gap (33) of the support plate (3), and the valve membrane (22) being arranged in the circulation area (23).

4. A valve according to claim 1, characterized in that: The bottom plate hole portion (11) is a single hole opened in the center of the bottom plate (1) or a hole group consisting of a plurality of holes opened in the center of the bottom plate (1).

5. A valve according to claim 3, characterized in that: The bottom plate hole portion (11) is annular, and a middle area of ​​the annular bottom plate hole portion (11) forms a blocking plate (12) that is opposite to the flow area (23).

6. A valve according to claim 5, characterized in that: The bottom plate hole portion (11) is composed of a plurality of air inlet holes, and the plurality of air inlet holes are evenly distributed in the circumferential direction with the center of the valve plate (2) as the center of the circle; The air inlet hole is a fan-shaped hole, a curved waist-shaped hole, or a curved square hole.

7. A valve according to claim 3, characterized in that: The valve plate (2) is fixed to the bottom plate (1) outside the bottom plate hole (11) via the bonding area (25), so that the flow area (23) and the sealing area (24) of the valve plate (2) are in contact with the bottom plate (1); when gas flows in from the bottom plate hole (11), the flow area (23) and the sealing area (24) of the valve plate (2) in contact with the bottom plate (1) are squeezed by the gas to elastically deform toward one side of the cover plate (4) and adhere to the periphery of the cover plate hole (41), thereby blocking the air leakage gap (33) and blocking the gas from flowing into the valve chamber (32), thereby preventing the gas from flowing out of the air leakage channel (31); at the same time, the valve (22) of the flow area (23) opens to form an air port, which is connected to the cover plate hole (41), and at this time, the gas is discharged from the cover plate hole (41); When gas flows in reverse from the cover plate hole (41), the gas port is closed. Under the push of the reversely flowing gas, the flow area (23) and the blocking area (24) of the valve plate (2) move toward one side of the bottom plate (1). The valve plate (2) is pushed against the bottom plate (1) and blocks the bottom plate hole (11). The air leakage gap (33) is opened. At this time, the gas is discharged from the air leakage channel (31) through the air leakage gap (33) and the valve chamber (32), thereby realizing the air leakage function.

8. A valve according to claim 5, characterized in that: A boss (13) is provided on the side of the blocking plate (12) facing the valve plate (2), and the diameter of the boss (13) is smaller than the inner diameter of the annular bottom plate hole (11).

9. A valve according to claim 3, characterized in that: A convex ring (42) is provided on the side of the cover plate (4) facing the valve plate (2), and the convex ring (42) is arranged on the periphery of the cover plate hole portion (41).

10. A fluid pump, characterized in that: The invention comprises a pump (5) and a valve according to any one of claims 1 to 9, wherein the pump (5) and the valve share a bottom plate (1), and the pump (5) has a pump chamber (51) connected to a bottom plate hole (11).

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