Valve body, blood pressure measurement apparatus, and wearable device

Abstract

Provided are a valve body (10), a blood pressure measurement apparatus (100), and a wearable device (1000). The valve body (10) comprises a housing (11), a flow guide portion (12), a movable plate (13), and an annular portion (14). At the moment when a pump body (20) is started, a pressure difference is formed between two sides of the movable plate (13) to move the movable plate (13) to a second position, and the movable plate (13) and the annular portion (14) jointly block a vent hole (1121). During inflation, the airflow of the pump body (20) enters a buffer chamber (114) from an air inlet hole (1111) along a first flow channel (121) and a second flow channel (153) of the flow guide portion (12), and enters an air bag (30) by means of an air outlet hole (113). After the pump body (20) stops inflating, the pressure difference between the two sides of the movable plate (13) can drive the movable plate (13) to move to a first position, such that the buffer chamber (114) is in communication with the vent hole (1121). During deflation, air of the air bag (30) can enter the buffer chamber (114) by means of the air outlet hole (113), a part of the air can flow out from the vent hole (1121), and the other part of the air can sequentially pass through the second flow channel (153) and the first flow channel (121) and flow out from the air inlet hole (1111), thereby realizing dual-channel venting of the valve body (10) via the vent hole (1121) and the air inlet hole (1111). The valve body (10) controls, by means of the airflow, the movable plate (13) to move to realize the on-off switching of the vent hole (1121), such that the power consumption is low.

Description

Valve body, blood pressure measuring device and wearable device

[0001] The present application claims priority to the Chinese patent application No. 202510219241.3, filed on February 25, 2025, and entitled "Valve body, blood pressure measuring device and wearable device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of fluid control, and in particular to a valve body, a blood pressure measuring device and a wearable device. BACKGROUND

[0003] The blood pressure measuring device measures blood pressure in the process of inflating and deflating the air bag. The blood pressure measuring device in the related art can be provided with an electromagnetic valve as a deflation valve of the air bag. In the process of inflating the air bag, the electromagnetic valve needs to be powered on to block the air path of the electromagnetic valve, so that the gas in the air bag does not flow out through the electromagnetic valve. After the blood pressure measurement is completed, the electromagnetic valve needs to be powered off to connect the air path of the electromagnetic valve, so as to deflate the gas in the air bag. However, the blood pressure measuring device described above is provided with an electromagnetic valve, and the electromagnetic valve needs to be controlled with power on, which has high power consumption. SUMMARY

[0004] Embodiments of the present application provide a valve body, a blood pressure measuring device and a wearable device, which solve the problem of high power consumption of the blood pressure measuring device in the related art due to the use of an electromagnetic valve.

[0005] Embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, the present application provides a valve body, comprising: a housing, a flow guide part, a movable plate and an annular part. The housing has a first wall and a second wall which are oppositely distributed along a first direction. The first wall has an air inlet hole, and an inner side surface of the first wall is provided with a throttle dam. The second wall has an air outlet hole, and the housing further has an air outlet hole and a buffer chamber. In the direction from the first wall to the second wall, the flow guide part, the movable plate and the annular part are arranged in the housing in sequence. The flow guide part is located inside the throttle dam, and the flow guide part has a first flow channel. The air inlet hole, the first flow channel, the second flow channel, the buffer chamber and the air outlet hole are sequentially connected. The movable plate can move in the housing along the first direction between a first position and a second position. When the movable plate is at the first position, the buffer chamber and the air outlet hole are connected. When the movable plate is at the second position, the movable plate and the annular part jointly block the air outlet hole.

[0007] The valve body provided in this embodiment can be used in conjunction with a pump body and an air bladder as a self-releasing valve. At the moment the pump body starts inflating, the air pressure in the buffer chamber and the air pressure at the outlet are atmospheric pressure, while the air pressure at the inlet is greater than atmospheric pressure. A pressure difference is formed between the two sides of the movable plate, allowing the movable plate to move from a first position to a second position along a first direction. The movable plate and the annular portion together seal the vent hole, preventing communication between the buffer chamber and the vent hole. During inflation, the airflow from the pump body can enter the buffer chamber through the inlet hole along the first and second flow channels of the guide portion. The air pressure inside the valve body gradually increases, and the pressure difference between the two sides of the movable plate increases accordingly, tightly sealing the vent hole. The airflow will not flow out of the vent hole but will instead enter the air bladder through the outlet hole, causing the air pressure inside the air bladder to rise. After the pump body stops inflating, the air pressure at the inlet hole drops to atmospheric pressure, while the pressure inside the air bladder and buffer chamber remains high. The pressure difference between the two sides of the movable plate can drive the movable plate to move from a second position to a first position along a first direction, connecting the buffer chamber and the vent hole. During the deflation process, the gas in the airbag enters the buffer chamber through the vent. A portion of the gas flows out through the vent, while the remaining gas flows sequentially through the second and first flow channels and out through the inlet, achieving dual-channel deflation via both the vent and inlet ports, resulting in high deflation efficiency. If one channel is blocked, deflation can proceed through the other, reducing the possibility of the airbag failing to deflate. The valve body uses airflow control to move a movable plate, switching the vent on and off. This eliminates the need for a solenoid valve with electromagnets and springs, as is common in related blood pressure measuring devices, resulting in lower power consumption and a smaller overall footprint. The buffer chamber buffers the airflow, ensuring a more uniform flow around the movable plate and reducing the risk of tilting due to uneven airflow.

[0008] In one alternative implementation, the housing includes a first shell and a second shell, which can be an assembled structure or an integral structure. A first wall is located in the first shell, and a second wall is located in the second shell. The first shell has an opening, and the second shell is disposed at the opening, with the edge of the second shell connected to the edge of the opening.

[0009] In one alternative implementation, the inner side of the throttling dam has a throttling surface, a first gap is formed between the outer peripheral surface of the movable plate and the throttling surface, and the second flow channel and the buffer chamber are connected through the first gap.

[0010] In one alternative implementation, the throttling surface of the throttling dam gradually approaches the axis of the air inlet in the direction from the first wall to the second wall. The throttling dam provides a certain guiding effect for the movable plate. When the movable plate moves to the second position, the movable plate and the annular portion can tightly seal the vent.

[0011] In one alternative implementation, the throttling surface of the throttling dam gradually approaches the axis of the air inlet in the direction from the first wall to the second wall. As the movable plate moves from the first position to the second position, the maximum width of the first gap gradually decreases.

[0012] At the moment the pump starts, the pressure difference between the two sides of the movable plate causes it to move towards the second position. As the movable plate moves towards the vent, the maximum width of the first gap gradually decreases, meaning the flow area of ​​the airflow decreases, the airflow velocity through the first gap increases, and the pressure decreases. The pressure difference between the two sides of the movable plate gradually increases, and the air pressure on the side of the movable plate closer to the guide section is greater than the air pressure in the buffer chamber, enabling the movable plate to move rapidly towards the vent.

[0013] In one alternative implementation, both the outer periphery of the movable plate and the throttling surface of the dam extend in a circular pattern.

[0014] In one alternative implementation, as the movable plate moves from the first position to the second position, the maximum width of the first gap gradually decreases. The sum of the height of the first flow channel and the thickness of the movable plate is less than or equal to the thickness of the throttling dam. This allows for a larger range of movement of the movable plate within a limited structural space, resulting in a wider range of variation in the maximum width of the first gap. The cooperation between the throttling dam and the movable plate effectively controls the airflow, enabling rapid movement of the movable plate from the first position to the second position during pump inflation.

[0015] In one alternative implementation, the sum of the height of the first flow channel and the thickness of the movable plate can be greater than the thickness of the dam. When the movable plate is in the first position, the movable plate portion is located outside the dam.

[0016] In one alternative implementation, the throttling surface of the dam includes at least one of an inclined surface and an arc-shaped surface. The dam and the movable plate work together to control the airflow velocity, enabling the movable plate to move rapidly along a first direction.

[0017] In one alternative implementation, the throttling dam extends along a circular ring, and the movable plate is circular. The throttling surface of the dam is an inclined surface, similar to the side surface of a frustum. The outer peripheral surface of the movable plate can resemble the side / outer peripheral surface of a cylinder.

[0018] In one alternative implementation, the throttling dam extends along a rectangle, and the movable plate is rectangular. The throttling surface of the throttling dam is a plane inclined relative to the axis of the air inlet, and the outer peripheral surface of the movable plate can be multiple planes parallel to the axis of the air inlet.

[0019] In one alternative implementation, the throttling surface of the dam is partly an inclined surface and partly an arc-shaped surface, and a first gap can be formed between the throttling surface of the dam and the outer peripheral surface of the movable plate.

[0020] In one alternative implementation, the inner side of the dam has a complete circumference of throttling surface. As the movable plate moves from the first position to the second position, the maximum width of the first gap gradually decreases.

[0021] In one alternative implementation, the inner side of the dam also has a limiting surface, which limits the movement of the movable plate along a first direction. A second gap is formed between the outer peripheral surface of the movable plate and the limiting surface. When the movable plate is in the first position, the minimum width of the first gap is greater than the minimum width of the second gap. The limiting surface of the dam provides a guiding effect on the movable plate, allowing it to move smoothly along the first direction. When the movable plate moves to the second position, the movable plate and the annular portion can tightly seal the vent hole.

[0022] In one alternative implementation, the outer periphery of the movable plate extends in a circular shape, and both the throttling surface and the limiting surface of the dam extend in an arc shape.

[0023] In one alternative implementation, the throttling dam is annular, with the throttling surface and the limiting surface arranged alternately along the circumference, thereby forming a first gap and a second gap arranged alternately along the circumference.

[0024] In one alternative implementation, the width of the first gap is equal in the direction from the first wall to the second wall. The dam guides the movable plate. When the movable plate moves to the second position, the movable plate and the annular portion can tightly seal the vent hole.

[0025] In one alternative implementation, the dam is annular, and the movable plate is circular. The dam's throttling surface can resemble the side / outer circumference of a cylinder. The movable plate's outer circumference can resemble the side / outer circumference of a cylinder.

[0026] In one alternative implementation, the dam is annular, and the first gap is distributed in annular shape.

[0027] In one alternative implementation, in the first direction, the projected shapes of the throttling surface of the dam and the outer peripheral surface of the movable plate can be matched, and their shapes are relatively close, so that an annular first gap is formed between the outer peripheral surface of the movable plate and the throttling surface of the dam.

[0028] In one alternative implementation, the dam is annular, the movable plate is circular, and a first annular extension gap is formed between the outer circumference of the movable plate and the dam's throttling surface.

[0029] In one alternative implementation, the throttling dam is a rounded rectangle, the movable plate is a rounded rectangle, and a first gap extending from the rounded rectangle is formed between the outer periphery of the movable plate and the throttling surface of the throttling dam.

[0030] In one alternative implementation, during the movement of the movable plate between the first and second positions, the movable plate is at least partially located inside the dam. The dam guides the movable plate, allowing it to move smoothly in the first direction. When the movable plate moves to the second position, the movable plate and the annular portion tightly seal the vent hole.

[0031] In one alternative implementation, multiple first flow channels are radially distributed in the guide section. Each first flow channel has a first port and a second port that are relatively distributed, with the first port connected to the air inlet and the second port connected to the second flow channel.

[0032] In one alternative implementation, multiple radially distributed first channels can be distributed around the axis of the air inlet.

[0033] In one alternative implementation, multiple first flow channels are radially distributed in the guide section. The first flow channels extend along a straight line or a curve. The curve can be an arc, parabola, spiral, etc.

[0034] In one alternative implementation, the flow guide includes a plurality of arrayed columnar bodies, with a first flow channel formed between adjacent columnar bodies.

[0035] In one alternative implementation, the annular portion is fixed to the side of the second wall facing the movable plate. The movable plate is movable in a first direction, while the annular portion remains stationary relative to the housing. When the movable plate is in the first position, the movable plate and the annular portion are spaced apart, and the buffer chamber, the inner cavity of the annular portion, and the vent are sequentially connected. When the movable plate is in the second position, the movable plate abuts against the annular portion, and the movable plate and the annular portion together block the vent, preventing the vent from communicating with the buffer chamber.

[0036] In one alternative implementation, the thickness of the movable plate is greater than or equal to the gap distance between the dam and the annular portion in the first direction. This allows the movable plate to move stably along the first direction, reducing the likelihood of the movable plate detaching from the dam.

[0037] In one alternative implementation, the annular portion is fixed to the side of the movable plate facing the second wall. The movable plate can move along a first direction, and the annular portion moves with the movable plate.

[0038] In one alternative implementation, the thickness of the movable plate is greater than or equal to the gap distance between the annular portion and the second wall in the first direction when the movable plate is in the first position. This allows the movable plate to move stably along the first direction, reducing the likelihood of the movable plate detaching from the dam.

[0039] In one alternative implementation, the annular portion can be an elastic body. During inflation, the pressure difference between the two sides of the movable plate causes it to move towards the vent. The elastic annular portion is compressed, and the cooperation between the movable plate and the annular portion effectively seals the vent.

[0040] In one alternative implementation, the annular portion can be a rigid component. During inflation, the pressure difference between the two sides of the movable plate causes it to move towards the vent. The cooperation between the movable plate and the annular portion seals the vent.

[0041] In one alternative implementation, the flow guide is fixed to the side of the first wall facing the movable plate. The movable plate is movable in a first direction, while the flow guide is a stationary component. When the movable plate is in a first position, it abuts against the flow guide. When the movable plate is in a second position, the movable plate and the flow guide are spaced apart.

[0042] In one alternative implementation, the flow guide is fixed to the side of the first wall facing the movable plate. The flow guide includes a plurality of radially distributed extension arms, with two adjacent extension arms and the first wall forming a first flow channel, thus creating a plurality of radially distributed first flow channels.

[0043] In one alternative implementation, the flow guide is fixed to the side of the first wall facing the movable plate. The flow guide includes multiple radially distributed extension arms, and baffles can be installed on the side of the multiple extension arms away from the first wall. Two adjacent extension arms, baffles, and the first wall form a first flow channel, thus forming multiple radially distributed first flow channels.

[0044] In one alternative implementation, the flow guide is fixed to the side of the first wall facing the movable plate. The flow guide includes a plurality of arrayed columnar bodies, with a first flow channel formed between adjacent columnar bodies.

[0045] In one alternative implementation, the flow guide is fixed to the side of the movable plate facing the first wall. The movable plate is movable in a first direction, and the flow guide moves with the movable plate. When the movable plate is in a first position, the flow guide abuts against the first wall. When the movable plate is in a second position, the flow guide and the first wall are spaced apart.

[0046] In one alternative implementation, the flow guide is fixed to the side of the movable plate facing the first wall. The flow guide includes multiple radially distributed extension arms, with two adjacent extension arms and the movable plate forming a first flow channel, thus creating multiple radially distributed first flow channels.

[0047] In one alternative implementation, the flow guide is fixed to the side of the movable plate facing the first wall. The flow guide includes multiple radially distributed extension arms, and baffles can be installed on the side of the multiple extension arms away from the movable plate. Two adjacent extension arms, baffles, and the movable plate form a first flow channel, thus forming multiple radially distributed first flow channels.

[0048] In one alternative implementation, the flow guide is fixed to the side of the movable plate facing the first wall. The flow guide includes a plurality of arrayed columnar bodies, with a first flow channel formed between adjacent columnar bodies.

[0049] In one alternative implementation, the annular portion is fixed to the side of the second wall facing the movable plate within the valve body. The flow guide portion is fixed to the side of the first wall facing the movable plate.

[0050] In one alternative implementation, the annular portion is fixed to the side of the movable plate facing the second wall within the valve body. The flow guide portion is fixed to the side of the first wall facing the movable plate.

[0051] In one alternative implementation, the annular portion is fixed to the side of the second wall facing the movable plate in the valve body. The flow guide portion is fixed to the side of the movable plate facing the first wall.

[0052] In one alternative implementation, the annular portion is fixed to the side of the movable plate facing the second wall within the valve body. The flow guide portion is fixed to the side of the movable plate facing the first wall.

[0053] In one alternative implementation, the housing is flat, and its thickness direction is parallel to the first direction. This allows the valve body to occupy a smaller overall structure, enabling it to be assembled in space-constrained environments, such as watch cases.

[0054] In one alternative implementation, the air inlet and air vent are respectively positioned in the first direction.

[0055] In one alternative implementation, the vent may be located on the first wall, the second wall, or the connecting wall between the first and second walls.

[0056] Secondly, embodiments of this application provide a blood pressure measuring device, including the aforementioned valve body, pump body, air bladder, and pressure sensor. The pump body and air bladder are connected via the valve body. The air inlet of the pump body and the valve body are connected, and the air outlet of the air bladder and the valve body are connected. The pressure sensor is used to detect the pressure inside the air bladder.

[0057] When the pump body is inflating, the airflow generated by the pump body enters the valve body through the air inlet and flows into the air bladder through the air outlet, thus inflating and pressurizing the air bladder. When the pump body stops inflating, some of the gas inside the air bladder can flow out through the vent hole of the valve body, and the other part of the gas can flow out through the air inlet of the pump body, realizing dual-channel venting.

[0058] In one alternative implementation, the pressure sensor and the airbag are connected via an air path. The valve body has two air outlets, with the airbag connected to one outlet and the pressure sensor connected to the other outlet, which detects the pressure inside the airbag.

[0059] In one alternative implementation, a pressure sensor can be attached to the inner wall of the airbag to detect the pressure inside the airbag.

[0060] In one alternative implementation, the blood pressure measuring device further includes a circuit board, to which the pump body and pressure sensor are electrically connected. The circuit board has a processor. The circuit board can perform drive control of the pump body and signal acquisition from the pressure sensor.

[0061] Thirdly, embodiments of this application provide a wearable device, including a housing, a strap, and the aforementioned blood pressure measuring device. The strap is connected to the housing, and an airbag is disposed on the strap. A pump body and a valve body may be disposed on the housing or the strap. Attached Figure Description

[0062] Figure 1 is a schematic diagram of the structure of the wearable device provided in an embodiment of this application;

[0063] Figure 2 is a hardware system diagram of the blood pressure measuring device provided in an embodiment of this application;

[0064] Figure 3(a) and (b) are three-dimensional assembly views of the valve body provided in the embodiments of this application from different perspectives;

[0065] Figure 4 is an exploded perspective view of the valve body provided in an embodiment of this application;

[0066] Figure 5 is an exploded perspective view of the valve body in Figure 4 from another angle;

[0067] Figure 6 is a cross-sectional view of the valve body along line AA in Figure 3(a);

[0068] Figures 7(a) to (d) are schematic diagrams of the valve body in Figure 6 at the moment of inflation start, inflation process, moment of inflation stop, and deflation process, respectively.

[0069] Figure 8 is a perspective assembly view of the valve body provided in another embodiment of this application;

[0070] Figure 9 is an exploded perspective view of the valve body in Figure 8;

[0071] Figure 10 is a cross-sectional view of the valve body in Figure 8 along line BB;

[0072] Figure 11 is a cross-sectional view of the valve body in Figure 8 along line CC;

[0073] Figure 12 is a schematic diagram of the cooperation between the movable plate and the throttling dam in the valve body of Figure 9;

[0074] Figure 13(a) and (b) are schematic diagrams of the valve body provided in another embodiment of this application at the moment of inflation start-up and during the inflation process, respectively;

[0075] Figure 14 is an exploded perspective view of a valve body provided in another embodiment of this application;

[0076] Figure 15(a) and (b) are schematic diagrams of the valve body in Figure 14 at the moment of inflation start-up and during the inflation process, respectively.

[0077] Figure 16 is an exploded perspective view of a valve body provided in another embodiment of this application;

[0078] Figure 17 is an exploded perspective view of the valve body in Figure 16 from another angle;

[0079] Figure 18(a) and (b) are schematic diagrams of the valve body in Figure 16 at the moment of inflation start-up and during the inflation process, respectively.

[0080] Figure 19 is an exploded perspective view of a valve body provided in another embodiment of this application;

[0081] Figure 20 is an exploded perspective view of the valve body in Figure 19 from another angle;

[0082] Figure 21(a) and (b) are schematic diagrams of the valve body in Figure 19 at the moment of inflation start-up and during the inflation process, respectively.

[0083] Explanation of reference numerals in the attached drawings: 1000-Wearable device; 100-Blood pressure measuring device; 200-Housing; 300-Strap; 10-Valve body; 20-Pump body; 30-Airbag; 40-Pressure sensor; 50-Circuit board; 11-Housing shell; 111-First wall; 111a-First shell; 1111-Air inlet; 112-Second wall; 112a-Second shell; 1121-Vent hole; 113-Exit hole; 114-Buffer chamber; 115-Connecting wall; 12-Guide section; 121-First flow channel; 121a-First port; 121b-Second port; 122-Extension arm; 13-Moving plate; 131-Outer peripheral surface; 14-Annular part; 15-Throttling dam; 151-Throttling surface; 152-Limiting surface; 153-Second flow channel; 16 - First gap; 17 - Second gap. Detailed Implementation

[0084] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this implementation. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may arise based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0085] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0086] It should be understood that, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0088] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0089] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0090] A blood pressure measuring device in related technology includes a pump body, an air bladder, and a solenoid valve. The pump body and the air bladder are connected. The solenoid valve includes a housing, a coil, a valve core, and a spring. The electromagnet, valve core, and spring are all installed within the housing. The housing has a first flow channel and a second flow channel, the second flow channel being connected to the air bladder. The valve core is located between the first and second flow channels. By switching the energization and de-energization of the coil of the electromagnet, the isolation and connection between the first and second flow channels are switched. The spring is used to drive the valve core to reset when the coil is de-energized.

[0091] When the blood pressure measuring device is not working, the electromagnet's coil is de-energized. Under the action of the spring force, the valve core does not block the second flow channel, and the first and second flow channels are connected. When the pump body inflates the airbag, the electromagnet's coil is energized. Under the action of the electromagnet's magnetic force, the valve core moves towards the coil to block the second flow channel, thus separating the first and second flow channels and preventing gas from flowing out of the airbag through the solenoid valve. When the airbag needs to be deflated, the coil is de-energized. Under the action of the spring force, the valve core does not block the second flow channel, and the first and second flow channels are connected. Some of the gas in the airbag can be deflated sequentially through the second and first flow channels, while the other part of the gas can be deflated by the pump body.

[0092] The aforementioned blood pressure measuring device is equipped with a solenoid valve, which requires energized control and therefore consumes a significant amount of power. The solenoid valve housing contains an electromagnet, valve core, and spring, occupying a considerable amount of space.

[0093] Referring to Figures 1 and 2, this application embodiment provides a blood pressure measuring device 100, including a valve body 10, a pump body 20, an air bladder 30, and a pressure sensor 40. The pump body 20 and the air bladder 30 are connected via the valve body 10. The air inlet 1111 of the pump body 20 and the valve body 10 are connected, and the air outlet 113 of the air bladder 30 is connected.

[0094] When the pump body 20 is inflated, the airflow generated by the pump body 20 enters the valve body 10 through the air inlet 1111 and flows into the air bladder 30 through the air outlet 113, thus inflating and pressurizing the air bladder 30. When the pump body 20 stops inflating, a portion of the gas inside the air bladder 30 can flow out through the vent 1121 of the valve body 10, while another portion of the gas can flow out through the pump body 20 through the air inlet 1111, achieving dual-channel venting. The pump body 20 can be a miniature air pump, occupying a small space.

[0095] Pressure sensor 40 is used to detect the pressure inside airbag 30. Pressure sensor 40 can be a differential pressure gauge, which can collect the pressure signal inside airbag 30 through the air passage between the differential pressure gauge and airbag 30.

[0096] In some embodiments, referring to FIG2, the pressure sensor 40 and the airbag 30 can be connected by an air passage. For example, the valve body 10 has two air outlets 113, the airbag 30 is connected to one of the air outlets 113, and the pressure sensor 40 is connected to the other air outlet 113, and the pressure sensor 40 detects the pressure inside the airbag 30.

[0097] In other embodiments, the pressure sensor 40 may be attached to the inner wall of the airbag 30 to detect the pressure inside the airbag 30.

[0098] In some embodiments, referring to FIG2, the blood pressure measuring device 100 further includes a circuit board 50, to which the pump body 20 and the pressure sensor 40 are electrically connected. The circuit board 50 has a processor. The circuit board 50 can realize drive control of the pump body 20 and signal acquisition of the pressure sensor 40.

[0099] Referring to Figures 1 and 2, this application embodiment provides a wearable device 1000, including a housing 200, a strap 300, and the aforementioned blood pressure measuring device 100. The strap 300 is connected to the housing 200, and an airbag 30 is disposed on the strap 300. The pump body 20 and the valve body 10 may be disposed on the housing 200 or the strap 300. The circuit board 50 may be disposed on the housing 200.

[0100] Wearable devices 1000 can include watches, wristbands, wrist blood pressure monitors, arm blood pressure monitors, and wrist blood pressure monitors.

[0101] Taking a wearable device 1000 as an example, such as a watch, the two straps 300 of the watch can be connected by buckles or other means. The blood pressure measuring device 100 can indirectly measure blood pressure using the oscillometric method. In use, the straps 300 are strapped to the wrist, with the air bladder 30 located between the straps 300 and the wrist tissue. The pump 20 inflates and pressurizes the air bladder 30, which compresses the wrist artery. When the internal pressure of the air bladder 30 reaches a certain level, the blood vessel closes to block blood flow. Subsequently, the air bladder 30 is deflated, and the internal pressure decreases. The pulse wave signal from the blood vessel can generate an oscillating waveform signal, and the pressure sensor 40 continuously monitors the internal pressure of the air bladder 30. The pressure signal is fed back to the circuit board 50, and the processor can calculate the blood pressure based on the pressure signal.

[0102] Referring to Figures 3 to 6, an embodiment of this application provides a valve body 10, including: a housing 11, a flow guide 12, a movable plate 13, and an annular portion 14. The housing 11 has a first wall 111 and a second wall 112 distributed opposite to each other along a first direction Z. The first wall 111 has an air inlet 1111, and a throttling dam 15 is provided on the inner side of the first wall 111. The second wall 112 has an air vent 1121, and the housing 11 also has an air outlet 113 and a buffer chamber 114. In the direction from the first wall 111 to the second wall 112, the flow guide 12, the movable plate 13, and the annular portion 14 are arranged sequentially inside the housing 11. The flow guide 12 is located inside the throttling dam 15, and the flow guide 12 has a first flow channel 121. The air inlet 1111, the first flow channel 121, the second flow channel 153, the buffer chamber 114, and the air outlet 113 are sequentially connected. The movable plate 13 can move within the housing 11 along a first direction Z between a first position and a second position. Referring to Figure 7(a), when the movable plate 13 is in the first position, the buffer chamber 114 and the vent 1121 are connected. Referring to Figure 7(b), when the movable plate 13 is in the second position, the movable plate 13 and the annular portion 14 jointly block the vent 1121.

[0103] Referring to Figure 2, the air inlet 1111 of the valve body 10 is used to communicate with the pump body 20. During inflation, the gas output from the pump body 20 can enter the valve body 10 through the air inlet 1111. The air outlet 113 is used to communicate with the airbag 30. During inflation, the gas inside the valve body 10 can enter the airbag 30 through the air outlet 113. During deflation, the gas inside the airbag 30 flows into the valve body 10 through the air outlet 113. The vent 1121 is used to allow airflow to exit during the deflation process of the airbag 30.

[0104] The annular part 14 can be in the form of a circular ring, an ellipse, a rounded rectangle, a rectangle, or other ring shapes.

[0105] Referring to Figure 6, the second flow channel 153 is part of the inner cavity of the throttling dam 15, which is used to connect the first flow channel 121 and the buffer chamber 114. When the movable plate 13 is located inside the throttling dam 15, the second flow channel 153 may be the area enclosed by the inner side of the throttling dam 15 and a portion of the inner side of the first wall 111 near the throttling dam 15.

[0106] Figure 7(a) to (d) are schematic diagrams of the valve body at the moment of inflation start, inflation process, moment of inflation stop, and deflation process, respectively. The arrows in the valve body indicate the airflow direction.

[0107] The valve body 10 provided in this embodiment can be used in conjunction with the pump body 20 and the air bladder 30 as a self-releasing valve. Referring to Figures 2 and 7(a), at the instant the pump body 20 is inflated and started, the air pressure in the buffer chamber 114 and the air pressure at the outlet 113 are atmospheric pressure P0, and the air pressure at the inlet 1111 is P... inThe pressure is greater than atmospheric pressure P0. A pressure difference (P) is formed between the two sides of the movable plate 13. in -P0) allows the movable plate 13 to move along the first direction Z from the first position shown in Figure 7(a) to the second position shown in Figure 7(b). The movable plate 13 and the annular part 14 jointly block the vent hole 1121, and the buffer chamber 114 and the vent hole 1121 are not connected. Referring to Figure 7(b), during the inflation process, the airflow of the pump body 20 can enter the buffer chamber 114 through the air inlet 1111 along the first flow channel 121 and the second flow channel 153 of the guide part 12. The air pressure in the valve body 10 gradually increases, and the pressure difference between the two sides of the movable plate 13 increases accordingly, so that the vent hole 1121 is tightly blocked. The airflow will not flow out from the vent hole 1121, but will enter the air bag 30 through the air outlet 113, causing the air pressure inside the air bag 30 to rise. Referring to Figure 7(c), after the pump body 20 stops inflating, the air pressure at the air inlet 1111 drops to atmospheric pressure P0, while the pressure inside the airbag 30 and the buffer chamber 114 remains high at P1. The pressure difference (P1-P0) between the two sides of the movable plate 13 can drive the movable plate 13 to move along the first direction Z from the second position shown in Figure 7(c) to the first position shown in Figure 7(d), thus connecting the buffer chamber 114 and the vent 1121. Referring to Figures 2 and 7(d), during the deflation process, the gas in the airbag 30 can enter the buffer chamber 114 through the air outlet 113, and a portion of the gas can flow out through the vent 1121. Another portion of the gas can sequentially pass through the second flow channel 153 and the first flow channel 121 and flow out through the air inlet 1111, achieving dual-channel deflation of the valve body 10 through the vent 1121 and the air inlet 1111, resulting in high deflation efficiency. When one channel is blocked, air can be released through another channel, reducing the possibility of the airbag 30 being unable to release air. The valve body 10 controls the movement of the movable plate 13 via airflow to switch the vent 1121 on and off, eliminating the need for a solenoid valve with electromagnets and springs as required by related blood pressure measuring devices. This results in lower power consumption and a smaller overall footprint. The buffer chamber 114 buffers the airflow, ensuring a more uniform flow around the movable plate 13 and reducing the risk of the movable plate 13 tilting due to uneven airflow.

[0108] In some embodiments, referring to Figures 3 to 5, the housing 11 includes a first housing 111a and a second housing 112a. The first housing 111a and the second housing 112a can be assembled structures (such as adhesives, welds, etc.) or integral structures. Exemplarily, a first wall 111 is located in the first housing 111a, and a second wall 112 is located in the second housing 112a. The first housing 111a has an opening, and the second housing 112a is disposed at the opening, with the edge of the second housing 112a connected to the edge of the opening.

[0109] In some embodiments, referring to Figures 5 and 6, the inner side of the throttling dam 15 has a throttling surface 151, and a first gap 16 is formed between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151. The second flow channel 153 and the buffer chamber 114 are connected through the first gap 16.

[0110] The inner side of the throttling dam 15 is the side of the throttling dam 15 closest to the air inlet 1111. The outer peripheral surface 131 of the movable plate 13 is the edge side of the movable plate 13, and the outer peripheral surface 131 of the movable plate 13 is located between two opposite sides of the movable plate 13.

[0111] Referring to Figure 7(b), during inflation, the airflow from the pump body 20 can enter the buffer chamber 114 through the air inlet 1111, along the first flow channel 121 and the second flow channel 153 of the guide section 12, through the first gap 16 between the movable plate 13 and the throttling dam 15, and then enter the airbag 30 through the air outlet 113. Referring to Figures 2 and 7(d), during deflation, the gas in the airbag 30 can enter the buffer chamber 114 through the air outlet 113, a portion of the gas can flow out through the vent 1121, and another portion of the gas can sequentially pass through the first gap 16, the second flow channel 153, and the first flow channel 121 and flow out through the air inlet 1111.

[0112] In some embodiments, referring to FIG6, in the direction from the first wall 111 to the second wall 112, the throttling surface 151 of the throttling dam 15 gradually approaches the axis A1 of the air inlet 1111. The throttling dam 15 provides a certain guiding effect for the movable plate 13, reducing the range of movement of the movable plate 13 in the vertical direction of the first direction Z. When the movable plate 13 moves to the second position, the movable plate 13 and the annular portion 14 can tightly seal the vent 1121, reducing the possibility that the movable plate 13 tilts and does not completely seal the vent 1121.

[0113] In some embodiments, referring to FIG6, in the direction from the first wall 111 to the second wall 112, the throttling surface 151 of the throttling dam 15 gradually approaches the axis A1 of the air inlet 1111. As the movable plate 13 moves from the first position in FIG7(a) to the second position in FIG7(b), the maximum width w1 of the first gap 16 gradually decreases.

[0114] On the cross-sectional surface of the valve body 10 along the axis A1 of the air inlet 1111, the maximum distance between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15 in the direction perpendicular to the axis A1 of the air inlet 1111 is the maximum width w1 of the first gap 16, that is, the distance between the outer peripheral surface 131 of the movable plate 13 near the guide part 12 and the throttling surface 151 of the throttling dam 15.

[0115] Referring to Figures 2, 6, and 7(a), at the instant the pump body 20 starts, the pressure difference between the two sides of the movable plate 13 causes it to move towards the second position, i.e., towards the vent hole 1121. During the movement of the movable plate 13 towards the vent hole 1121, the maximum width w1 of the first gap 16 gradually decreases, meaning the flow area of ​​the airflow decreases, and the airflow velocity through the first gap 16 increases. According to Bernoulli's principle, under ideal conditions, at any cross-section of the same flow tube, the sum of the fluid's kinetic energy, potential energy, and pressure energy is a constant. A corollary of Bernoulli's principle is that when fluid flows at a constant height, the greater the velocity, the lower the pressure. Since the extension length of the first gap 16 is relatively small, the fluid flowing through the first gap 16 can be considered to be flowing at a constant height; therefore, the airflow velocity increases and the pressure decreases as it flows through the first gap 16. The pressure difference between the two sides of the movable plate 13 gradually increases, and the air pressure on the side of the movable plate 13 closer to the guide section 12 is greater than the air pressure in the buffer chamber 114, enabling the movable plate 13 to move rapidly towards the vent 1121. Referring to Figure 7(b), the movable plate 13 and the annular section 14 together block the vent 1121. The buffer chamber 114 and the vent 1121 are not connected; gas enters the airbag 30 through the buffer chamber 114 and the vent 113, thus inflating and pressurizing the airbag 30.

[0116] Referring to Figures 2 and 7(c), after the pump body 20 stops inflating, the air pressure at the air inlet 1111 drops to atmospheric pressure P0, while the pressure in the airbag 30 and buffer chamber 114 remains high at P1. The pressure difference (P1-P0) between the two sides of the movable plate 13 drives the movable plate 13 to move towards the first position, i.e., towards the guide section 12. Referring to Figure 7(d), this connects the buffer chamber 114 and the vent 1121. A portion of the gas can flow out from the vent 1121, and another portion can flow out through the first gap 16. The airflow velocity increases and the pressure decreases as it passes through the first gap 16. The pressure difference between the two sides of the movable plate 13 further increases, and the air pressure in the buffer chamber 114 is greater than the air pressure on the side of the movable plate 13 closest to the guide section 12, enabling the movable plate 13 to move rapidly towards the guide section 12.

[0117] For example, the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15 both extend in a circular shape. The width of the first gap 16 is the difference between the radius of the throttling surface 151 of the throttling dam 15 and the radius of the outer peripheral surface 131 of the movable plate 13 in the direction perpendicular to the axis A1 of the air inlet 1111.

[0118] In some embodiments, referring to FIG6, as the movable plate 13 moves from the first position to the second position, the maximum width w1 of the first gap 16 gradually decreases. The sum of the height h1 of the first flow channel 121 and the thickness h2 of the movable plate 13 is less than or equal to the thickness h3 of the throttling dam 15. The height h1 of the first flow channel 121, the thickness h2 of the movable plate 13, and the thickness h3 of the throttling dam 15 are the dimensions of the first flow channel 121, the movable plate 13, and the throttling dam 15 in the first direction Z, respectively.

[0119] When the movable plate 13 is in the first position, the guide section 12 and the movable plate 13 are located inside the throttling dam 15. The movable plate 13 moves between the first position and the second position, allowing for a large range of movement within the limited structural space. This results in a large range of variation in the maximum width w1 of the first gap 16. The cooperation between the throttling dam 15 and the movable plate 13 can effectively control the airflow, enabling the movable plate 13 to move rapidly from the first position to the second position when the pump body 20 is being inflated.

[0120] In other embodiments, the sum of the height h1 of the first flow channel 121 and the thickness h2 of the movable plate 13 can be greater than the thickness h3 of the throttling dam 15. When the movable plate 13 is in the first position, the movable plate 13 is partially located outside the throttling dam 15. The movable plate 13 moves between the first position and the second position, and the cooperation between the throttling dam 15 and the movable plate 13 can control the airflow to a certain extent, enabling a faster movement of the movable plate 13 from the first position to the second position when the pump body 20 is inflated.

[0121] In some embodiments, referring to FIG6, the throttling surface 151 of the throttling dam 15 includes at least one of an inclined surface and an arcuate surface. These forms of throttling dam 15, in conjunction with the movable plate 13, can control the airflow velocity, enabling the movable plate 13 to move rapidly along the first direction Z.

[0122] When the throttling surface 151 is an inclined surface, the inclined surface is inclined relative to the axis A1 of the air inlet 1111. When the throttling surface 151 is an arc-shaped surface, the arc-shaped surface appears arc-shaped on the cross-sectional surface of the valve body 10 passing through the axis A1 of the air inlet 1111.

[0123] For example, referring to Figures 5 and 6, the throttling dam 15 extends along a circular ring, and the movable plate 13 is circular. The throttling surface 151 of the throttling dam 15 is an inclined surface, similar to the side surface of a frustum. The outer peripheral surface 131 of the movable plate 13 can be similar to the side / outer peripheral surface of a cylinder. When the first wall 111 and the second wall 112 are arranged from top to bottom, on the cross-section of the valve body 10 along the axis A1 passing through the air inlet 1111, the inner edge of the throttling dam 15 is an inverted trapezoid, with the upper base length of the trapezoid being greater than the lower base length.

[0124] For example, the throttling dam 15 extends in a rectangle, and the movable plate 13 is rectangular. The throttling surface 151 of the throttling dam 15 is a plane inclined relative to the axis A1 of the air inlet 1111, and the outer peripheral surface 131 of the movable plate 13 can be multiple planes parallel to the axis A1 of the air inlet 1111.

[0125] For example, the throttling surface 151 of the throttling dam 15 is partly inclined and partly arc-shaped, and a first gap 16 can be formed between the throttling surface 151 of the throttling dam 15 and the outer peripheral surface 131 of the movable plate 13.

[0126] In some embodiments, referring to Figures 5 and 6, the inner side of the throttling dam 15 has a complete circumference of throttling surface 151. As the movable plate 13 moves from the first position to the second position, the maximum width w1 of the first gap 16 gradually decreases. The throttling dam 15 and the movable plate 13 work together to effectively control airflow, enabling rapid movement of the movable plate 13 from the first position to the second position when the pump body 20 is inflated.

[0127] In some embodiments, referring to Figures 8 to 11, the inner side of the throttling dam 15 further has a limiting surface 152, which limits the movement of the movable plate 13 along a first direction Z. A second gap 17 is formed between the outer peripheral surface 131 of the movable plate 13 and the limiting surface 152. Referring to Figure 12, when the movable plate 13 is in the first position, the minimum width w2 of the first gap 16 is greater than the minimum width w3 of the second gap 17.

[0128] On the cross-sectional surface of the valve body 10 along axis A1 passing through the air inlet 1111, in the direction perpendicular to axis A1 of the air inlet 1111, referring to Figure 11, the minimum distance between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15 is the minimum width w2 of the first gap 16. Referring to Figure 10, the minimum distance between the outer peripheral surface 131 of the movable plate 13 and the limiting surface 152 of the throttling dam 15 is the minimum width w3 of the second gap 17.

[0129] The limiting surface 152 of the dam 15 guides the movable plate 13, allowing it to move smoothly along the first direction Z and reducing the range of movement of the movable plate 13 in the vertical direction of the first direction Z. When the movable plate 13 moves to the second position, the movable plate 13 and the annular part 14 can tightly seal the vent hole 1121, reducing the possibility that the movable plate 13 may tilt and fail to completely seal the vent hole 1121.

[0130] For example, the outer peripheral surface 131 of the movable plate 13 extends in a circular shape, and both the throttling surface 151 and the limiting surface 152 of the throttling dam 15 extend in an arc shape. The width of the first gap 16 is the difference between the radius of the throttling surface 151 of the throttling dam 15 and the radius of the outer peripheral surface 131 of the movable plate 13 in the direction perpendicular to the axis A1 of the air inlet 1111. The width of the second gap 17 is the difference between the radius of the limiting surface 152 of the throttling dam 15 and the radius of the outer peripheral surface 131 of the movable plate 13 in the direction perpendicular to the axis A1 of the air inlet 1111.

[0131] In some embodiments, referring to Figures 9 and 12, the throttling dam 15 is annular, with the throttling surface 151 and the limiting surface 152 arranged alternately in the circumferential direction, thereby forming a first gap 16 and a second gap 17 arranged alternately in the circumferential direction. At the moment the pump body 20 starts, the airflow passes through the air inlet 1111 and the first flow channel 121 of the guide portion 12 and enters the second flow channel 153. The airflow can pass more evenly through the edge of the movable plate 13, that is, the first gap 16 and the second gap 17 arranged alternately in the circumferential direction, so that the movable plate 13 moves quickly and stably along the first direction Z toward the vent 1121. The movable plate 13 and the annular portion 14 together tightly seal the vent 1121.

[0132] In other embodiments, referring to Figures 13(a) and (b), the width of the first gap 16 is equal in the direction from the first wall 111 to the second wall 112. The throttling dam 15 guides the movable plate 13, reducing the range of movement of the movable plate 13 in the vertical direction of the first direction Z. When the movable plate 13 moves to the second position, the movable plate 13 and the annular portion 14 can tightly seal the vent hole 1121, reducing the possibility that the movable plate 13 tilts and does not completely seal the vent hole 1121.

[0133] For example, the throttling dam 15 is annular, and the movable plate 13 is circular. The throttling surface 151 of the throttling dam 15 can resemble the side / outer circumference of a cylinder. The outer circumference surface 131 of the movable plate 13 can resemble the side / outer circumference of a cylinder.

[0134] In some embodiments, referring to Figures 5 and 6, the throttling dam 15 is annular, and the first gap 16 is annularly distributed. The annular shape can be circular, elliptical, rounded rectangle, rectangular, etc. The annular first gap 16 is formed between the throttling dam 15 and the movable plate 13, and the second flow channel 153 and the buffer chamber 114 are connected through the first gap 16.

[0135] Referring to Figures 2 and 7(a), at the moment the pump body 20 starts, the airflow generated by the pump body 20 enters the second flow channel 153 through the air inlet 1111 and the first flow channel 121 of the guide portion 12. The airflow can pass through the first gap 16 and enter the buffer chamber 114 relatively evenly, so that the movable plate 13 moves stably along the first direction Z toward the vent 1121. Referring to Figure 7(b), when the movable plate 13 moves to the second position, the movable plate 13 and the annular portion 14 can tightly seal the vent 1121, reducing the possibility that the movable plate 13 tilts and does not completely seal the vent 1121.

[0136] Referring to (c) and (d) in Figures 2 and 7, when the pump body 20 stops working, the airflow of the airbag 30 enters the buffer chamber 114. The airflow in the buffer chamber 114 can pass through the first gap 16 and enter the second flow channel 153 more evenly. The first flow channel 121 of the guide section 12 flows out through the air inlet 1111, reducing the tilt of the movable plate 13.

[0137] In the first direction Z, the projected shapes of the throttling surface 151 of the throttling dam 15 and the outer peripheral surface 131 of the movable plate 13 can be matched and are relatively close, so that an annular first gap 16 is formed between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15.

[0138] For example, the throttling dam 15 is annular, the movable plate 13 is circular, and an annularly extending first gap 16 is formed between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15.

[0139] For example, the throttling dam 15 is a rounded rectangle, the movable plate 13 is a rounded rectangle, and a first gap 16 extending from the rounded rectangle is formed between the outer peripheral surface 131 of the movable plate 13 and the throttling surface 151 of the throttling dam 15.

[0140] In some embodiments, referring to Figures 7(a) to (d), during the movement of the movable plate 13 between the first and second positions, the movable plate 13 is at least partially located inside the throttling dam 15. The throttling dam 15 provides a guiding function for the movable plate 13, allowing it to move smoothly along the first direction Z, reducing the range of movement of the movable plate 13 in the vertical direction of the first direction Z, and reducing the possibility of the movable plate 13 disengaging from the throttling dam 15. When the movable plate 13 moves to the second position, the movable plate 13 and the annular portion 14 can tightly seal the vent hole 1121, reducing the possibility of the movable plate 13 tilting and not completely sealing the vent hole 1121.

[0141] In some embodiments, referring to Figures 5 and 6, a plurality of first flow channels 121 are radially distributed in the flow guide portion 12. The first flow channel 121 has a first port 121a and a second port 121b that are relatively distributed. The first port 121a is connected to the air inlet 1111, and the second port 121b is connected to the second flow channel 153.

[0142] Referring to Figures 2 and 7(a), during the inflation process of the pump body 20, the airflow output by the pump body 20 flows through the air inlet 1111 along different first flow channels 121, and flows from the first port 121a of the first flow channel 121 toward the corresponding second port 121b, so that the airflow is diffused more evenly to the second flow channel 153. The airflow can pass more evenly through the first gap 16 at the edge of the movable plate 13, so that the movable plate 13 moves stably along the first direction Z toward the vent 1121. Combined with Figure 7(b), the movable plate 13 and the annular part 14 jointly block the vent 1121.

[0143] Referring to Figure 7(d), during the deflation process, the gas in the airbag 30 can enter the buffer chamber 114 through the air outlet 113, pass through the first gap 16 and the second flow channel 153, flow from the second port 121b of the first flow channel 121 toward the corresponding first port 121a, and flow out through the air inlet 1111.

[0144] Multiple radially distributed first flow channels 121 can be distributed with the axis A1 of the air inlet 1111 as the center.

[0145] In some embodiments, referring to FIG5, a plurality of first flow channels 121 are radially distributed in the guide portion 12. The first flow channels 121 extend along a straight line or a curve. The curve can be an arc, a parabola, a spiral, etc. During inflation, the airflow entering through the air inlet 1111 can diffuse into the throttling dam 15 through the first flow channels 121 with different orientations. During deflation, the airflow in the throttling dam 15 can flow towards the air inlet 1111 through different first flow channels 121.

[0146] In other embodiments, the flow guide 12 includes a plurality of arrayed columnar bodies, with a first flow channel 121 formed between adjacent columnar bodies. During inflation, the airflow from the pump body 20 can enter the buffer chamber 114 through the air inlet 1111 along the first flow channel 121 and the second flow channel 153 of the flow guide 12. During deflation, the gas from the airbag 30 can enter the buffer chamber 114 through the air outlet 113, a portion of the gas can flow out through the air outlet 1121, and another portion of the gas can sequentially pass through the second flow channel 153 and the first flow channel 121 and flow out through the air inlet 1111.

[0147] There are several possible implementation methods when setting the position of the annular portion 14. Two implementation methods are given as examples below.

[0148] The first arrangement of the annular portion 14: Referring to Figures 4 and 6, the annular portion 14 is fixed to the side of the second wall 112 facing the movable plate 13. The movable plate 13 can move along the first direction Z, and the annular portion 14 is stationary relative to the housing 11. Referring to Figure 7(a), when the movable plate 13 is in the first position, the movable plate 13 and the annular portion 14 are spaced apart, and the buffer chamber 114, the inner cavity of the annular portion 14, and the vent hole 1121 are connected in sequence. Referring to Figure 7(b), when the movable plate 13 is in the second position, the movable plate 13 abuts against the annular portion 14, and the movable plate 13 and the annular portion 14 together block the vent hole 1121, and the vent hole 1121 and the buffer chamber 114 are not connected.

[0149] In some embodiments, referring to FIG6, the thickness h2 of the movable plate 13 is greater than or equal to the gap distance h4 between the throttling dam 15 and the annular portion 14 in the first direction Z. The thickness h2 of the movable plate 13 is the dimension of the movable plate 13 in the first direction Z. The gap distance h4 between the throttling dam 15 and the annular portion 14 in the first direction Z is the gap distance between the side of the throttling dam 15 facing the annular portion 14 and the side of the annular portion 14 facing the throttling dam 15.

[0150] The above limitations enable the movable plate 13 to move stably along the first direction Z, reducing the likelihood of the movable plate 13 detaching from the throttling dam 15 and reducing the likelihood of the movable plate 13 tilting without completely sealing the vent hole 1121.

[0151] The second arrangement of the annular portion 14: Referring to Figure 14, the annular portion 14 is fixed to the side of the movable plate 13 facing the second wall 112. The movable plate 13 can move along the first direction Z, and the annular portion 14 moves with the movable plate 13. Referring to Figure 15(a), when the movable plate 13 is in the first position, the annular portion 14 and the second wall 112 are spaced apart, and the buffer chamber 114 and the vent hole 1121 are directly connected. Referring to Figure 15(b), when the movable plate 13 is in the second position, the annular portion 14 abuts against the second wall 112, and the movable plate 13 and the annular portion 14 together block the vent hole 1121, and the vent hole 1121 and the buffer chamber 114 are not connected.

[0152] In some embodiments, referring to Figures 1 and 2, the thickness h2 of the movable plate 13 is greater than or equal to the gap distance h5 between the annular portion 14 and the second wall 112 in the first direction Z when the movable plate 13 is in the first position. The thickness h2 of the movable plate 13 is the dimension of the movable plate 13 in the first direction Z. When the movable plate 13 is in the first position, the gap distance h5 between the annular portion 14 and the second wall 112 in the first direction Z is the gap distance between the side of the annular portion 14 facing the second wall 112 and the side of the second wall 112 facing the annular portion 14.

[0153] The above limitations enable the movable plate 13 to move stably along the first direction Z, reducing the likelihood of the movable plate 13 detaching from the throttling dam 15 and reducing the likelihood of the movable plate 13 tilting without completely sealing the vent hole 1121.

[0154] In some embodiments, referring to Figures 4 and 6, the annular portion 14 can be an elastomer. During inflation, the pressure difference between the two sides of the movable plate 13 causes the movable plate 13 to move towards the vent 1121. The elastic annular portion 14 is compressed under force, and the cooperation between the movable plate 13 and the annular portion 14 can effectively seal the vent 1121. During deflation, the elastic annular portion 14 will return to its original shape after the pressure is released. The elastomer can be a gel, such as rubber, polyurethane, or silicone.

[0155] Referring to Figures 7(a) and (b), when the annular portion 14 is fixed to the second wall 112, during the inflation process, under the pressure difference between the two sides of the movable plate 13, after the movable plate 13 comes into contact with the elastic annular portion 14, the annular portion 14 will continue to be compressed, achieving close contact between the annular portion 14 and the movable plate 13, so that air will not flow out from the vent hole 1121.

[0156] Referring to Figures 15(a) and (b), when the annular portion 14 is fixed to the movable plate 13, during the inflation process, under the pressure difference between the two sides of the movable plate 13, the movable plate 13 drives the annular portion 14 to move. After the elastic annular portion 14 comes into contact with the second wall 112, the annular portion 14 will continue to be compressed, achieving close contact between the annular portion 14 and the movable plate 13, so that air will not flow out from the vent hole 1121.

[0157] In other embodiments, the annular portion 14 can be a rigid component. During inflation, the pressure difference between the two sides of the movable plate 13 causes the movable plate 13 to move toward the vent 1121. The movable plate 13 and the annular portion 14 cooperate to seal the vent 1121.

[0158] There are several possible implementation methods when setting the position of the guide section 12. Two implementation methods are given as examples below.

[0159] The first arrangement of the flow guide 12: Referring to Figures 5 and 6, the flow guide 12 is fixed to the side of the first wall 111 facing the movable plate 13. The movable plate 13 can move along the first direction Z, and the flow guide 12 is a stationary component. Referring to Figure 7(a), when the movable plate 13 is in the first position, the movable plate 13 can abut against the flow guide 12. Referring to Figure 7(b), when the movable plate 13 is in the second position, the movable plate 13 and the flow guide 12 are spaced apart.

[0160] For example, referring to FIG5, the flow guide 12 is fixed to the side of the first wall 111 facing the movable plate 13. The flow guide 12 includes a plurality of radially distributed extension arms 122, and two adjacent extension arms 122 and the first wall 111 form a first flow channel 121, thus forming a plurality of radially distributed first flow channels 121.

[0161] For example, the flow guide 12 is fixed to the side of the first wall 111 facing the movable plate 13. The flow guide 12 includes a plurality of radially distributed extension arms 122. A baffle may be provided on the side of the plurality of extension arms 122 away from the first wall 111. Two adjacent extension arms 122, the baffle and the first wall 111 form a first flow channel 121, thus forming a plurality of radially distributed first flow channels 121.

[0162] For example, the flow guide 12 is fixed to the side of the first wall 111 facing the movable plate 13. The flow guide 12 includes a plurality of columnar bodies arranged in an array, with a first flow channel 121 formed between adjacent columnar bodies.

[0163] The second arrangement of the flow guide 12: Referring to Figures 16 to 18, the flow guide 12 is fixed to the side of the movable plate 13 facing the first wall 111. The movable plate 13 can move along the first direction Z, and the flow guide 12 moves with the movable plate 13. Referring to Figure 18(a), when the movable plate 13 is in the first position, the flow guide 12 abuts against the first wall 111. Referring to Figure 18(b), when the movable plate 13 is in the second position, the flow guide 12 and the first wall 111 are spaced apart.

[0164] For example, referring to FIG16, the flow guide 12 is fixed to the side of the movable plate 13 facing the first wall 111. The flow guide 12 includes a plurality of radially distributed extension arms 122, and two adjacent extension arms 122 and the movable plate 13 form a first flow channel 121, thus forming a plurality of radially distributed first flow channels 121.

[0165] For example, the flow guide 12 is fixed to the side of the movable plate 13 facing the first wall 111. The flow guide 12 includes a plurality of radially distributed extension arms 122. A baffle may be provided on the side of the plurality of extension arms 122 away from the movable plate 13. Two adjacent extension arms 122, the baffle and the movable plate 13 form a first flow channel 121, thus forming a plurality of radially distributed first flow channels 121.

[0166] For example, the flow guide 12 is fixed to the side of the movable plate 13 facing the first wall 111. The flow guide 12 includes a plurality of columnar bodies arranged in an array, with a first flow channel 121 formed between adjacent columnar bodies.

[0167] It is understandable that the different arrangements of the annular portion 14 and the different arrangements of the guide portion 12 can be combined as needed to form different embodiments.

[0168] For example, in the valve body 10 shown in Figures 3 to 7, the annular portion 14 is fixed to the side of the second wall 112 facing the movable plate 13. The flow guide portion 12 is fixed to the side of the first wall 111 facing the movable plate 13.

[0169] For example, in the valve body 10 shown in Figures 14 and 15, the annular portion 14 is fixed to the side of the movable plate 13 facing the second wall 112. The flow guide portion 12 is fixed to the side of the first wall 111 facing the movable plate 13.

[0170] For example, in the valve body 10 shown in Figures 16 to 18, the annular portion 14 is fixed to the side of the second wall 112 facing the movable plate 13. The flow guide portion 12 is fixed to the side of the movable plate 13 facing the first wall 111.

[0171] For example, in the valve body 10 shown in Figures 19 to 21, the annular portion 14 is fixed to the side of the movable plate 13 facing the second wall 112. The flow guide portion 12 is fixed to the side of the movable plate 13 facing the first wall 111.

[0172] In some embodiments, referring to FIG3, the housing 11 is flat, and the thickness direction of the housing 11 is parallel to the first direction Z. This allows the overall structure of the valve body 10 to occupy less space, enabling the valve body 10 to be assembled in space-constrained scenarios, such as the case of a watch.

[0173] In some embodiments, referring to FIG6, the air inlet 1111 and the air vent 1121 are correspondingly arranged in the first direction Z. Referring to FIG2 and FIG7(a), at the moment the pump body 20 starts, the airflow generated by the pump body 20 passes through the air inlet 1111, the first flow channel 121, and the second flow channel 153. The airflow can enter the buffer chamber 114 relatively evenly through the first gap 16, causing the movable plate 13 to move stably along the first direction Z toward the air vent 1121. Referring to FIG7(b), when the movable plate 13 moves to the second position, the movable plate 13 and the annular portion 14 can tightly seal the air vent 1121, reducing the possibility of the movable plate 13 tilting and not completely sealing the air vent 1121.

[0174] In some embodiments, referring to Figures 3 and 6, the vent 113 may be located on the first wall 111, the second wall 112, or the connecting wall 115 between the first wall 111 and the second wall 112. The position of the vent 113 can be set as needed.

[0175] In addition to being applicable to the blood pressure measuring device 100 and the wearable device 1000, the valve body 10 of this application embodiment can also be applied to other devices or apparatuses that require the valve body 10, such as fluid control devices.

[0176] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A valve body, characterized in that, include: The shell (11), the flow guide (12), the movable plate (13), and the annular part (14); The housing (11) has a first wall (111) and a second wall (112) distributed opposite to each other along a first direction; the first wall (111) has an air inlet (1111), and a throttling dam (15) is provided on the inner side of the first wall (111); the second wall (112) has an air vent (1121), and the housing (11) also has an air outlet (113) and a buffer chamber (114); In the direction from the first wall (111) to the second wall (112), the flow guide (12), the movable plate (13) and the annular part (14) are arranged sequentially in the housing (11); The flow guide (12) is located inside the flow dam (15). The flow guide (12) has a first flow channel (121). The air inlet (1111), the first flow channel (121), the second flow channel (153), the buffer chamber (114) and the air outlet (113) are connected in sequence. The movable plate (13) can move within the housing (11) along the first direction between a first position and a second position; When the movable plate (13) is in the first position, the buffer chamber (114) and the vent (1121) are in communication; When the movable plate (13) is in the second position, the movable plate (13) and the annular portion (14) together block the vent hole (1121).

2. The valve body according to claim 1, characterized in that, The inner side of the throttling dam (15) has a throttling surface (151), and a first gap (16) is formed between the outer peripheral surface (131) of the movable plate (13) and the throttling surface (151). The second flow channel (153) and the buffer chamber (114) are connected through the first gap (16).

3. The valve body according to claim 2, characterized in that, In the direction from the first wall (111) to the second wall (112), the throttling surface (151) gradually approaches the axis (A1) of the air inlet (1111).

4. The valve body according to claim 3, characterized in that, As the movable plate (13) moves from the first position to the second position, the maximum width (w1) of the first gap (16) gradually decreases.

5. The valve body according to claim 4, characterized in that, The sum of the height (h1) of the first flow channel (121) and the thickness (h2) of the movable plate (13) is less than or equal to the thickness (h3) of the throttling dam (15).

6. The valve body according to any one of claims 3 to 5, characterized in that, The throttling surface (151) includes at least one of an inclined surface and an arc-shaped surface.

7. The valve body according to any one of claims 2 to 6, characterized in that, The inner side of the throttling dam (15) also has a limiting surface (152), which is used to limit the movement of the movable plate (13) along the first direction; a second gap (17) is formed between the outer peripheral surface (131) of the movable plate (13) and the limiting surface (152); when the movable plate (13) is in the first position, the minimum width (w2) of the first gap (16) is greater than the minimum width (w3) of the second gap (17).

8. The valve body according to claim 7, characterized in that, The throttling dam (15) is annular, and the throttling surface (151) and the limiting surface (152) are arranged alternately along the circumference.

9. The valve body according to any one of claims 1 to 8, characterized in that, During the movement of the movable plate (13) between the first position and the second position, the movable plate (13) is at least partially located inside the throttling dam (15).

10. The valve body according to any one of claims 1 to 9, characterized in that, Multiple first flow channels (121) are radially distributed in the flow guide (12); each first flow channel (121) has a first port (121a) and a second port (121b) that are relatively distributed, the first port (121a) is connected to the air inlet (1111), and the second port (121b) is connected to the second flow channel (153).

11. The valve body according to claim 10, characterized in that, The first flow channel (121) extends along a straight line or a curve.

12. The valve body according to any one of claims 1 to 11, characterized in that, The annular portion (14) is fixed to the side of the second wall (112) facing the movable plate (13).

13. The valve body according to claim 12, characterized in that, The thickness (h2) of the movable plate (13) is greater than or equal to the gap distance (h4) between the throttling dam (15) and the annular portion (14) in the first direction.

14. The valve body according to any one of claims 1 to 11, characterized in that, The annular portion (14) is fixed to the side of the movable plate (13) facing the second wall (112).

15. The valve body according to claim 14, characterized in that, The thickness (h2) of the movable plate (13) is greater than or equal to the gap distance (h5) between the annular portion (14) and the second wall (112) in the first direction when the movable plate (13) is in the first position.

16. The valve body according to any one of claims 1 to 15, characterized in that, The annular portion (14) is an elastic body.

17. The valve body according to any one of claims 1 to 16, characterized in that, The flow guide (12) is fixed to the side of the first wall (111) facing the movable plate (13); Alternatively, the guide section (12) is fixed to the side of the movable plate (13) facing the first wall (111).

18. The valve body according to any one of claims 1 to 17, characterized in that, The shell (11) is flat, and the thickness direction of the shell (11) is parallel to the first direction.

19. A blood pressure measuring device, characterized in that, The device includes a pump body (20), an air bladder (30), a pressure sensor (40), and a valve body (10) as described in any one of claims 1 to 18, wherein the air inlet (1111) of the pump body (20) and the valve body (10) are connected, the air bladder (30) and the air outlet (113) of the valve body (10) are connected, and the pressure sensor (40) is used to detect the pressure inside the air bladder (30).

20. A wearable device, characterized in that, It includes a housing (200), a strap (300), and a blood pressure measuring device (100) as claimed in claim 19, wherein the strap (300) is connected to the housing (200), and the airbag (30) is disposed on the strap (300).

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