Leaking valve and sphygmomanometer

Abstract

The present invention discloses a leakage valve and a sphygmomanometer. The leakage valve is used for gas leakage, and comprises: an upper cover, the upper cover is provided with an air inlet; a lower cover assembly, the lower cover assembly is connected to the upper cover, an air storage portion is formed between the lower cover assembly and the upper cover, the lower cover assembly is provided with an air outlet and an air outlet channel that are interconnected, the top of the air outlet is located inside the lower cover assembly, and the air outlet channel and the air inlet are both connected to the air storage portion. The sphygmomanometer comprises the above-mentioned leakage valve. In the leakage valve of the present invention, since the air outlet is located inside the lower cover assembly, a shielding can be formed to reduce the possibility of particulate dust falling into the air outlet and clogging it, and the gas is not easy to rush into the air outlet directly, which can reduce the influence of air pressure on the leakage rate to a certain extent.

Description

Technical Field

[0001] The invention relates to the field of fluid control, and in particular to an air leakage valve and a sphygmomanometer. Background Art

[0002] In devices such as sphygmomanometers, a leak valve is generally required to achieve uniform air leakage. Currently, most leak valves are pinhole leak valves. The principle is to use a laser to punch fine holes on the plane of the valve body, and the gas leaks out through these fine holes. However, when this type of leak valve is used, the gas directly rushes to the fine holes. Therefore, the leakage rate is greatly affected by the air pressure. The difference between the leakage rate at high and low air pressures is large, and it is easily affected by the environment. If fine dust falls into the fine holes, it will block them and prevent normal leakage. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air leakage valve, which can reduce the influence of air pressure on air leakage rate to a certain extent, and the air outlet is not easily blocked.

[0004] The present invention also provides a sphygmomanometer, in which the air leakage valve can reduce the influence of air pressure on the air leakage rate to a certain extent, and the air outlet is not easily blocked.

[0005] In a first aspect, an embodiment of the present invention provides a gas leakage valve for gas leakage, comprising:

[0006] An upper cover, wherein the upper cover is provided with an air inlet;

[0007] A lower cover assembly is connected to the upper cover, an air storage portion is formed between the lower cover assembly and the upper cover, an air outlet and an air outlet channel which are interconnected are provided on the lower cover assembly, the top of the air outlet is located inside the lower cover assembly, and the air outlet channel and the air inlet are both connected to the air storage portion.

[0008] The air leakage valve of the embodiment of the present invention has at least the following beneficial effects: since the air outlet is located inside the lower cover assembly, it can form a shielding, reducing the possibility of particulate dust falling into the air outlet and clogging it, and the gas is not easy to rush into the air outlet directly, which can reduce the influence of air pressure on the leakage rate to a certain extent.

[0009] According to some other embodiments of the air leakage valve of the present invention, the lower cover assembly includes a lower cover and a middle piece, the middle piece is at least partially located on the top of the lower cover, the middle piece is connected to the lower cover, the air outlet channel is located between the middle piece and the lower cover, the air outlet passes through the lower cover, and the top of the air outlet is located within the coverage area of ​​the middle piece.

[0010] According to some other embodiments of the air leakage valve of the present invention, the middle piece includes a connecting portion and a covering portion that are integrally connected, the lower cover is provided with a through hole, the covering portion is located at the top of the lower cover, the connecting portion extends into the through hole, and the connecting portion is provided with a limit block protruding outward, and the limit block can limit the separation of the middle piece from the lower cover.

[0011] According to some other embodiments of the air leakage valve of the present invention, a groove is provided on the top of the lower cover to form the air outlet channel.

[0012] According to some other embodiments of the air leakage valve of the present invention, an end of the groove is aligned with the air outlet.

[0013] According to some other embodiments of the air leakage valve of the present invention, the end of the groove is staggered with the air outlet, a receiving space is provided between the covering portion and the lower cover, and the groove is connected with the air outlet through the receiving space.

[0014] According to some other embodiments of the air leakage valve of the present invention, a protrusion is provided on the top of the lower cover so that there is a gap between the covering portion and the lower cover, and the gap is the air outlet channel.

[0015] In the air leakage valve according to some other embodiments of the present invention, the bottom surface of the covering portion is a curved surface convex upward.

[0016] According to some other embodiments of the air leakage valve of the present invention, the top surface of the lower cover is a curved surface protruding upward, and the curvature of the top surface of the lower cover is smaller than the curvature of the bottom surface of the covering portion.

[0017] In a second aspect, an embodiment of the present invention provides a sphygmomanometer, comprising the above-mentioned air leakage valve.

[0018] The sphygmomanometer according to the embodiment of the present invention has at least the following beneficial effects: in the air leakage valve of the sphygmomanometer, since the air outlet is located inside the lower cover assembly, a shielding can be formed to reduce the possibility of particulate dust falling into the air outlet and clogging it, and the gas is not easy to rush directly into the air outlet, which can reduce the influence of the air pressure on the leakage rate to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the air leakage valve in the first embodiment;

[0020] Figure 2 is a schematic diagram of the overall structure of the air leakage valve in the first embodiment;

[0021] Figure 3 is an exploded view of the air leakage valve in the first embodiment;

[0022] Figure 4 is a cross-sectional view of the air leakage valve in the first embodiment;

[0023] Figure 5 is a schematic structural diagram of the lower cover in the second embodiment;

[0024] Figure 6 is a schematic structural diagram of the lower cover in the third embodiment;

[0025] Figure 7 2 is a schematic diagram of the structure of the lower cover in the fourth embodiment.

[0026] Reference numerals:

[0027] Upper cover 100, air inlet 110, block 120, lower cover 200, through hole 210, groove 220, air outlet 230, slot 240, recess 250, fixing plate 260, middle piece 300, covering part 310, connecting part 320, stop block 321, air storage part 400;

[0028] Lower cover 200a, through hole 210a, groove 220a, air outlet 230a;

[0029] Lower cover 200b, through hole 210b, protrusion 220b, air outlet 230b;

[0030] Lower cover 200c, through hole 210c, protrusion 220c, air outlet 230c. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, if orientation descriptions are involved, the orientations or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, etc. are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the embodiments of the present invention, if a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it may be directly set, fixed, or connected to the other feature, or it may be indirectly set, fixed, connected, or installed on the other feature. In the description of the embodiments of the present invention, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than", or "exceeds" is involved, it should be understood as not including the number itself, and if "above", "below", or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] First embodiment

[0035] Reference Figure 1 to Figure 2 The air leakage valve in this embodiment includes an upper cover 100, a lower cover 200 and a middle piece 300. The upper cover 100 is located on the top of the lower cover 200. Figure 3 and Figure 4 , the cavity between the upper cover 100 and the lower cover 200 forms an air storage part 400, and the top of the middle piece 300 is located in the air storage part 400. The upper cover 100 and the lower cover 200 are both plastic parts, and the middle piece 300 is a silicone part. The upper cover 100 is fixedly connected to the lower cover 200. Specifically, it can be fixed by bonding or the like. Preferably, a card block 120 extends downward from the bottom of the upper cover 100, and a card slot 240 is provided at the top of the lower cover 200. When the upper cover 100 and the lower cover 200 are assembled, the card block 120 is inserted into the card slot 240 for positioning.

[0036] Reference Figure 3 and Figure 4The upper cover 100 is provided with an air inlet 110, and the air inlet 110 is connected to the air storage part 400. The middle piece 300 includes a covering part 310 and a connecting part 320, which are connected as one piece. A circle of outwardly protruding limit blocks 321 is also provided on the connecting part 320. A through hole 210 is provided on the lower cover 200, and the connecting part 320 of the middle piece 300 extends into the through hole 210, and the limit block 321 is located below the through hole 210, and the size of the limit block 321 is larger than the size of the through hole 210 to limit the position of the middle piece 300. If the middle piece has a tendency to move upward and leave the lower cover 200, the limit block 321 will be stuck at the through hole 210. The outer ring of the lower cover 200 surrounding the through hole 210 is also provided with three grooves 220 and three air outlets 230, and the end of each groove 220 is aligned with an air outlet 230, so that the groove 220 is connected with the air outlet 230. The groove 220 here is the air outlet channel. And the three air outlets 230 are all located within the coverage of the cover portion 310 of the middle piece 300.

[0037] The gas enters the gas storage part 400 from the gas inlet 110 and presses the middle piece 300 downward to make it close to the lower cover 200. The gas in the gas storage part 400 will flow from the groove 220 (gas outlet channel) to the gas outlet 230, and then be discharged from the leaking valve. Of course, since there is a gap between the connecting part 320 and the inner wall of the through hole 210, part of the gas may also flow out from the gap, but the flow rate is small and can be ignored.

[0038] Due to the shielding of the cover part 310 of the middle piece 300, the gas is not easy to rush directly into the gas outlet 230, but enters the gas outlet 230 from the groove 220 (gas outlet channel) on the side of the gas outlet 230 after being buffered by the gas storage part 400. Compared with the pinhole leakage valve, the influence of the air pressure on the leakage rate can be reduced. In addition, due to the shielding of the gas outlet 230 by the cover part 310, the possibility of fine dust falling into the gas outlet 230 is reduced, so that it is not easy to be blocked.

[0039] In this embodiment, the grooves 220 (air outlet channels) and the air outlets 230 are provided in three groups, but not limited thereto, and only one group may be provided. Of course, the preferred solution is to provide multiple groups and evenly distribute them in an annular shape to increase the stability of the air leakage process.

[0040] Reference Figure 4In this embodiment, the cover part 310 of the middle piece 300 is in an "umbrella shape", that is, the cover part 310 bulges upward, and there is a holding space between the bottom of the cover part 310 and the lower cover 200. Of course, the cover part 310 can also be set as a plane to achieve air leakage. At this time, the bottom of the cover part 310 will be close to the top of the lower cover 200. When leaking, the gas still flows into the outlet 230 through the groove 220 (air outlet channel). However, it is preferred to use an "umbrella-shaped" piece, at least the bottom surface of the cover part 310 bulges upward. Since the middle piece 300 is a silicone piece, it is easy to deform when the mold is opened after the injection molding is completed, or during the subsequent storage and transportation. If it is a flat piece, it may deform toward the front or back. After being installed on the lower cover 200, it may be unable to cover the outlet 230 because its deformation direction is upward, and the gas may directly rush into the outlet 230. If the "umbrella shape" is made, even if it is deformed, it is more likely to face the concave side. When the deformation is not large, it can still cover the gas outlet 230. Even if the deformation is too large, resulting in the edge of the cover part 310 no longer covering the gas outlet 230, when the gas enters the gas storage part 400, it will press the cover part 310 downward, which may cause it to cover the gas outlet 230 again. Therefore, compared with a flat piece, it is more advantageous for the bottom surface of the cover part 310 to bulge upward.

[0041] When the cover part 310 is set to be "umbrella-shaped", preferably, the top surface of the lower cover 200 can also be raised upwards, so that the contact area between the lower cover 200 and the bottom surface of the cover part 310 is higher and the airtightness is better. However, its curvature must be smaller than the curvature of the bottom surface of the cover part 310, so as to avoid too large a gap between the lower cover 200 and the cover part 310 due to excessive curvature, so that the cover part 310 loses its shielding function.

[0042] In addition, a portion of the bottom of the lower cover 200 is hollowed out upward to form a recessed portion 250, so that the air outlet 230 is suspended in the air, reducing the possibility that the air outlet 230 is blocked by the bottom component and cannot leak. The bottom of the lower cover is also provided with a fixing plate 260 extending outward, and the fixing plate 260 can be fixed to the location to be installed by a threaded fastener.

[0043] This embodiment also provides a sphygmomanometer, which includes the above-mentioned air leakage valve.

[0044] In addition, the air leakage valve is suitable for air pressure not exceeding 500 mmHg.

[0045] Second embodiment

[0046] This embodiment is an alternative embodiment of the first embodiment. Figure 5In this embodiment, the end of the groove 220a (air outlet channel) is not aligned with the air outlet 230a, and the two are staggered. At this time, the bottom surface of the cover portion must be convex upward and cannot be set as a plane, so that there is a accommodating space between the bottom surface of the cover portion and the top surface of the lower cover 200a. The gas flows from the groove 220a (air outlet channel) into the accommodating space between the bottom surface of the cover portion and the top surface of the lower cover 200a, and then flows into the air outlet 230a. In this embodiment, the gas can be buffered for a second time in the accommodating space between the bottom surface of the cover portion and the top surface of the lower cover 200a, so that the gas flows into the air outlet 230a more smoothly. And during manufacturing, there is no need to deliberately align the groove 220a with the air outlet 230a, which reduces the difficulty of manufacturing to a certain extent.

[0047] Third embodiment

[0048] This embodiment is an alternative embodiment of the first embodiment. Figure 6 In this embodiment, the groove on the lower cover 200b is replaced with a protrusion 220b. The protrusion 220b will prop up the covering part so that a gap is formed between the positions on both sides of the protrusion 220b on the top surface of the lower cover 200b and the bottom surface of the covering part. The gap is the air outlet channel, and the gas in the gas storage part 400 flows into the air outlet 230b from the gap. In both the first and second embodiments, it is necessary to process the groove on the lower cover after the injection molding is completed, which requires two processes to complete. In this embodiment, the groove is replaced with a protrusion, and the protrusion can be made at the same time when the lower cover 220b is injection molded, which reduces one process and improves efficiency.

[0049] Fourth embodiment

[0050] This embodiment is an alternative embodiment of the second embodiment. Figure 7 In this embodiment, the groove on the lower cover 200c is replaced with a protrusion 220c. The protrusion 220c will prop up the covering part, so that a gap is formed between the positions on both sides of the protrusion 220c on the top surface of the lower cover 200c and the bottom surface of the covering part. The gap is the air outlet channel, and the gas in the gas storage part 400 flows into the air outlet 230c from the gap. In both the first and second embodiments, it is necessary to process the groove on the lower cover after the injection molding is completed, which requires two processes to complete. In this embodiment, the groove is replaced with a protrusion, and the protrusion can be made at the same time when the lower cover 220c is injection molded, which reduces one process and improves efficiency.

[0051] Fifth embodiment

[0052] This embodiment is an alternative embodiment of the first embodiment. In this embodiment, the middle piece 300 is not provided with the connecting portion 320, and the covering portion 310 can be directly fixed to the top of the lower cover 200 by bonding or other methods.

[0053] Sixth embodiment

[0054] This embodiment is an alternative embodiment of the first embodiment. In this embodiment, the middle piece 300 and the lower cover 200 are directly made into an integrated lower cover assembly. At this time, the air outlet 230 is located inside the entire lower cover assembly, and a part of the air outlet channel 220 is exposed from the top of the lower cover assembly to achieve communication with the air storage part 400. However, the manufacturing difficulty of this integrated connection is greater than the split structure in the first embodiment.

[0055] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A gas leakage valve, used for gas leakage, characterized in that: include: An upper cover, wherein the upper cover is provided with an air inlet; A lower cover assembly, wherein the lower cover assembly is connected to the upper cover, an air storage portion is formed between the lower cover assembly and the upper cover, the lower cover assembly is provided with an air outlet and an air outlet channel which are interconnected, the top of the air outlet is located inside the lower cover assembly, and the air outlet channel and the air inlet are both connected to the air storage portion; The lower cover assembly comprises a lower cover and a middle piece, wherein at least a portion of the middle piece is located at the top of the lower cover, the middle piece is connected to the lower cover, the air outlet passage is located between the middle piece and the lower cover, the air outlet passes through the lower cover, and the top of the air outlet is located within the coverage area of ​​the middle piece; The middle piece comprises a connecting portion and a covering portion which are integrally connected, the lower cover is provided with a through hole, the covering portion is located at the top of the lower cover, the connecting portion extends into the through hole, and the connecting portion is provided with a limit block protruding outward, and the limit block can limit the separation of the middle piece from the lower cover; A groove is provided on the top of the lower cover to form the air outlet channel, and the end of the groove is aligned with the air outlet.

2. The air leakage valve according to claim 1, characterized in that: The bottom surface of the covering portion is a curved surface convex upward.

3. The air leakage valve according to claim 2, characterized in that: The top surface of the lower cover is a curved surface protruding upward, and the curvature of the top surface of the lower cover is smaller than the curvature of the bottom surface of the covering portion.

4. A sphygmomanometer, characterized in that: The invention comprises the air leakage valve according to any one of claims 1 to 3.

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