Exhaust device and electronic sphygmomanometer

Abstract

The utility model belongs to the technical field of exhaust valves, and particularly provides an exhaust device and an electronic sphygmomanometer, the electronic sphygmomanometer comprises the exhaust device, the exhaust device comprises a shell, a magnet assembly, a coil assembly and a sealing piece, the magnet assembly, the coil assembly and the sealing piece are all arranged in the shell, and an air inlet is formed in the shell; the coil assembly is at least partially located in a magnetic field formed by the magnet assembly, the sealing piece is connected to the coil assembly and provided with an arc-shaped sealing face facing the air inlet hole, the electrified coil assembly can drive the sealing piece to move in the direction close to or away from the air inlet hole, and therefore the air inlet hole is blocked or opened through the arc-shaped sealing face. Compared with a plane, the arc-shaped sealing surface can reduce the impact of high-speed air flow on the sealing element, so that the abrasion of the sealing element is reduced, the service life of the exhaust device is prolonged, and in addition, vibration and noise caused by air flow can be reduced; an arc-shaped air channel can be formed between the arc-shaped sealing face and the air inlet hole, and the control precision of the air flow can be improved.

Description

Technical Field

[0001] This application belongs to the field of exhaust valve technology, specifically relating to an exhaust device and an electronic blood pressure monitor. Background Technology

[0002] Electronic blood pressure monitors have gradually replaced traditional mercury sphygmomanometers due to their convenience and accuracy. Supported by linear valve technology, modern electronic blood pressure monitors can achieve more precise pressure control and measurement, providing users with more reliable data. The linear valve is one of the key components of an electronic blood pressure monitor; it controls the valve opening via an electrical signal to continuously regulate the gas flow, thereby controlling the pressure within the cuff. However, the linear valves currently used in electronic blood pressure monitors are easily damaged by the impact of high-speed airflow, resulting in a short service life. Utility Model Content

[0003] The purpose of this application is to provide an exhaust device and an electronic blood pressure monitor, which aims to solve the technical problem of short service life of linear valves used in electronic blood pressure monitors in the prior art.

[0004] On the one hand, to achieve the above objectives, the technical solution adopted in this application is: an exhaust device, including a housing, a magnet assembly, a coil assembly, and a seal. The magnet assembly, the coil assembly, and the seal are all disposed inside the housing. The housing is provided with an air inlet. The coil assembly is at least partially located in the magnetic field formed by the magnet assembly. The seal is connected to the coil assembly and has an arc-shaped sealing surface facing the air inlet. When energized, the coil assembly can drive the seal to move toward or away from the air inlet, thereby blocking or opening the air inlet through the arc-shaped sealing surface.

[0005] Compared with existing technologies, the exhaust device provided in this application has the following advantages: Utilizing the working principle of a loudspeaker, the coil assembly and magnet assembly work together to move the sealing element closer to or further away from the air inlet. This allows the arc-shaped sealing surface of the sealing element to either block or open the air inlet, achieving the exhaust function. Furthermore, adjusting the distance between the arc-shaped sealing surface and the air inlet allows for continuous regulation of the gas flow. Compared to a flat surface, the arc-shaped sealing surface reduces the impact of high-speed airflow on the sealing element, thereby reducing wear and extending the service life of the exhaust device. It also reduces vibration and noise caused by gas flow and avoids system instability due to sudden changes in gas pressure. In addition, the arc-shaped sealing surface and the air inlet form an arc-shaped air passage, which not only improves the control accuracy of the gas flow but also facilitates the management of the gas flow path, reducing unnecessary losses.

[0006] Furthermore, the exhaust device also includes a spring sheet disposed inside the housing. The four edges of the spring sheet are fixedly connected to the housing. The seal, coil assembly and spring sheet are fixedly connected. When the coil assembly is energized, it drives the seal to move from the initial position toward the direction close to the air intake, and the spring sheet undergoes elastic deformation.

[0007] Furthermore, the spring is provided with a through hole, the coil assembly is located on the side of the spring facing away from the air inlet, and the seal includes a mating part and a connecting part that are fixedly connected. The mating part is located on the side of the spring facing the air inlet and has an arc-shaped sealing surface. The connecting part passes through the through hole and is fixedly connected to the coil assembly. The mating part and the coil assembly cooperate to clamp the spring.

[0008] Furthermore, the coil assembly includes a fixed bracket and a coil winding fixedly mounted on the fixed bracket. The fixed bracket has a fixing hole, and the connecting part is inserted into the fixing hole and fixed to the fixed bracket. The fixed bracket and the mating part cooperate to clamp the spring piece.

[0009] Furthermore, the fixing hole includes a first hole segment and a second hole segment arranged sequentially in a direction away from the air inlet. The diameter of the second hole segment is larger than the diameter of the first hole segment. The junction of the second hole segment and the first hole segment forms a first annular limiting surface facing away from the air inlet. The connecting part includes a rod and a head. The radial dimension of the head along the fixing hole is larger than the radial dimension of the rod along the fixing hole. The two ends of the rod are fixedly connected to the mating part and the head, respectively. The rod passes through the first hole segment, and the head is located in the second hole segment and is locked on the first annular limiting surface.

[0010] Furthermore, the inner wall surface of the outer casing has a second annular limiting surface facing the magnet assembly. The second annular limiting surface abuts against the periphery of one side of the spring piece. The exhaust device also includes a sealing ring. The sealing ring abuts against the periphery of the spring piece facing away from the second annular limiting surface. The magnet assembly abuts against the side of the sealing ring facing away from the spring piece.

[0011] Furthermore, the outer casing is provided with an air nozzle, and the air nozzle has an air inlet that communicates with the interior of the outer casing. The air nozzle has a boss formed on the inner wall of the outer casing. A mating plane is provided on the side of the boss facing the arc-shaped sealing surface. The mating plane is perpendicular to the axis of the air inlet. The arc-shaped sealing surface closes the air inlet by abutting against the mating plane.

[0012] Furthermore, the seal is elastic.

[0013] Furthermore, the magnet assembly includes an iron core and a permanent magnet. The iron core is provided with a mounting groove, the permanent magnet is disposed in the mounting groove, and the coil assembly is at least partially disposed in the mounting groove and arranged around the permanent magnet.

[0014] On the other hand, in order to achieve the above objectives, the technical solution adopted in this application is: an electronic blood pressure monitor, including an air supply device, a cuff and the aforementioned exhaust device, wherein the cuff has an inner cavity, and the air supply device and the air inlet are both connected to the inner cavity.

[0015] Compared with existing technologies, the electronic blood pressure monitor provided in this application offers the following advantages: The gas supply device inflates the cuff by injecting gas into its inner cavity. When it is necessary to reduce the gas pressure in the cuff's inner cavity, the control coil assembly moves the sealing element away from the air inlet, causing the arc-shaped sealing surface of the sealing element to open the air inlet. This allows the gas in the cuff's inner cavity to be discharged into the outer casing through the air inlet, achieving exhaust. Compared to a flat surface, the arc-shaped sealing surface reduces the impact of high-speed airflow on the sealing element, thereby reducing wear and extending the service life of the exhaust device. It also reduces vibration and noise caused by gas flow and avoids system instability due to sudden changes in gas pressure. Furthermore, the arc-shaped sealing surface and the air inlet form an arc-shaped air passage, which not only improves the control accuracy of gas flow but also facilitates the management of the gas flow path, reducing unnecessary losses. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Schematic diagram of the exhaust device provided in the embodiments of this application Figure 1 ;

[0018] Figure 2 for Figure 1 A cross-sectional view of the exhaust device shown;

[0019] Figure 3 for Figure 2 A cross-sectional view of the seal of the exhaust device shown;

[0020] Figure 4 for Figure 2 A cross-sectional view of the mounting bracket for the exhaust device shown;

[0021] Figure 5 for Figure 2 The diagram shows the structure of the spring clip of the exhaust device;

[0022] Figure 6 Schematic diagram of the exhaust device provided in the embodiments of this application Figure 2 .

[0023] The following are the labeling elements in the figure:

[0024] 10. Outer shell; 11. First shell; 111. Air inlet; 112. Air nozzle; 1121. Boss; 1122. Mating surface; 113. Exhaust port; 114. Second annular limiting surface; 115. Receiving groove; 12. Second shell; 121. Cable management groove; 122. Clearance groove; 123. Protruding corner;

[0025] 20. Magnet assembly; 21. Iron core; 211. Mounting slot; 22. Permanent magnet;

[0026] 30. Coil assembly; 31. Fixing bracket; 311. Fixing hole; 3111. First hole segment; 3112. Second hole segment; 3113. First annular limiting surface; 32. Coil winding; 321. Lead wire;

[0027] 40. Seal; 41. Mating part; 4121. Arc-shaped sealing surface; 42. Connecting part; 421. Rod part; 422. Head;

[0028] 50. Spring piece; 51. Outer ring; 52. Inner ring; 521. Through hole; 53. Elastic deformation part;

[0029] 60. Sealing ring;

[0030] 70. Conductive terminals;

[0031] 80. Threaded fasteners. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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.

[0034] 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.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] Combination Figure 1 and Figure 2 As shown, this application provides an exhaust device, including a housing 10, a magnet assembly 20, a coil assembly 30, and a seal 40. The magnet assembly 20, the coil assembly 30, and the seal 40 are all disposed inside the housing 10. The housing 10 is provided with an air inlet 111. The coil assembly 30 is at least partially located in the magnetic field formed by the magnet assembly 20. The seal 40 is connected to the coil assembly 30 and has an arc-shaped sealing surface 4121 facing the air inlet 111. When the coil assembly 30 is energized, it can drive the seal 40 to move toward or away from the air inlet 111, thereby blocking or opening the air inlet 111 through the arc-shaped sealing surface 4121.

[0037] Applying this principle to the operation of a loudspeaker, when the coil assembly 30 is energized, the magnetic field generated by the coil assembly 30 interacts with the magnetic field generated by the magnet assembly 20, exerting a force on the coil assembly 30. This causes the coil assembly 30 to move. When the current changes, causing a change in the magnetic field, the direction and magnitude of the force on the coil assembly 30 also change accordingly. By connecting the seal 40 to the coil assembly 30, the coil assembly 30 drives the seal 40 to move closer to or further away from the air inlet 111. This allows the arc-shaped sealing surface 4121 of the seal 40 to either block or open the air inlet 111, thus achieving the exhaust function. Adjusting the distance between the arc-shaped sealing surface 4121 and the air inlet 111 allows for continuous adjustment of the gas flow rate. Compared to a flat surface, the arc-shaped sealing surface 4121 reduces the impact of high-speed airflow on the seal 40, thereby reducing wear on the seal 40, extending the service life of the exhaust device, reducing vibration and noise caused by gas flow, and preventing system instability due to sudden changes in gas pressure. In addition, the arc-shaped sealing surface 4121 and the air inlet 111 can form an arc-shaped air passage, which can not only improve the control accuracy of gas flow, but also help manage the gas flow path and reduce unnecessary losses.

[0038] In one embodiment, such as Figure 2 As shown, the outer casing 10 is provided with an air nozzle 112, and an air inlet 111 is provided inside the air nozzle 112. A boss 1121 is formed inside the outer casing 10. A mating plane 1122 is provided on the side of the boss 1121 facing the arc-shaped sealing surface 4121. The mating plane 1122 is perpendicular to the axis of the air inlet 111. The arc-shaped sealing surface 4121 closes the air inlet 111 by abutting against the mating plane 1122. When the arc-shaped sealing surface 4121 opens the air inlet 111, an arc-shaped air passage is formed between the arc-shaped sealing surface 4121 and the mating plane 1122. Furthermore, the boss 1121 includes a conical portion and a cylindrical portion. The diameter of the conical portion gradually decreases towards the arc-shaped sealing surface 4121. Specifically, the conical portion can be frustum-shaped. The cylindrical portion is connected to one end of the conical portion near the arc-shaped sealing surface 4121. The end face of the cylindrical portion away from the conical portion forms a mating plane 1122. The air inlet 111 penetrates the conical portion and the cylindrical portion. This design can increase the pressure when the arc-shaped sealing surface 4121 contacts the mating plane 1122, making it easier for the elastic sealing element 40 to achieve airtight sealing.

[0039] In one embodiment, combined Figure 1 and Figure 2As shown, the outer wall of the housing 10 is recessed to form a receiving groove 115. The part of the air nozzle 112 that protrudes from the outer wall of the housing 10 is at least partially housed in the receiving groove 115. This design helps to shorten the length of the air nozzle 112, thereby improving strength, extending service life and preventing eccentricity.

[0040] In one embodiment, such as Figure 1 As shown, the outer casing 10 is also provided with an exhaust port 113. After the airflow enters the interior of the outer casing 10 through the air inlet 111, it is discharged to the external environment through the exhaust port 113.

[0041] In one embodiment, such as Figure 2 As shown, the exhaust device also includes a spring plate 50 disposed within the housing 10. The four edges of the spring plate 50 are fixedly connected to the housing 10. The seal 40, the coil assembly 30, and the spring plate 50 are fixedly connected. When the coil assembly 30, after being energized, moves the seal 40 from its initial position toward the air inlet 111, the spring plate 50 undergoes elastic deformation. By fixing the four edges of the spring plate 50 to the housing 10, the seal 40, the coil assembly 30, and the spring plate 50 are fixedly connected. Thus, the spring plate 50 can support the seal 40 and the coil assembly 30, keeping them in a "suspended" state. This prevents the coil assembly 30 from directly contacting the magnet assembly 20 and also ensures that the arc-shaped sealing surface 4121 of the seal 40 is aligned with the air inlet 111. When the energized coil assembly 30 moves the seal 40 from its initial position toward the air inlet 111, the spring 50 elastically deforms as the seal 40 and coil assembly 30 move. When the interaction force between the coil assembly 30 and the magnet assembly 20 is removed, the spring 50 returns to its original shape, moving the seal 40 and coil assembly 30 away from the air inlet 111, thus returning them to their initial positions and achieving automatic reset. The shape of the spring 50 is not limited; for example, it can be circular, elliptical, square, etc. The material of the spring 50 is also not limited; for example, it can be made of beryllium copper.

[0042] In one embodiment, the seal 40 and the coil assembly 30 are both connected to the middle of the spring 50. The axis of the air inlet 111 passes through the geometric center of the seal 40, the geometric center of the spring 50, and the geometric center of the coil assembly 30. This ensures that the seal 40 and the coil assembly 30 can move stably in a straight line along the axial direction of the air inlet 111, thereby improving the control accuracy of the gas flow.

[0043] In one embodiment, combined Figure 2 , Figure 3 and Figure 5As shown, the spring 50 has a through hole 521, and the coil assembly 30 is located on the side of the spring 50 facing away from the air inlet 111. The seal 40 includes a mating part 41 and a connecting part 42 fixedly connected. The mating part 41 is located on the side of the spring 50 facing the air inlet 111 and has an arc-shaped sealing surface 4121. The connecting part 42 passes through the through hole 521 and is fixedly connected to the coil assembly 30. The mating part 41 and the coil assembly 30 cooperate to clamp the spring 50. During assembly, the connecting part 42 of the seal 40 passes through the through hole 521 of the spring 50 and is fixedly connected to the coil assembly 30, so that the mating part 41 of the seal 40 and the coil assembly 30 cooperate to clamp the spring 50, thereby realizing the fixed connection of the seal 40, the spring 50, and the coil assembly 30. Specifically, the through hole 521 is located at the center of the spring piece 50 and aligned with the air inlet 111 to ensure that the axis of the air inlet 111 passes through the geometric center of the seal 40, the geometric center of the spring piece 50, and the geometric center of the coil assembly 30. The connection method between the connecting part 42 and the coil assembly 30 is not limited; it can be insertion, bonding, welding, threaded connection, etc. In other embodiments, the seal 40 and the coil assembly 30 may not be directly connected, but rather fixed to opposite sides of the spring piece 50 respectively. The fixing method is not limited and can be bonding, welding, threaded connection, etc.

[0044] In one instance, such as Figure 5 The spring 50 includes an outer ring portion 51, an inner ring portion 52, and an elastic deformation portion 53. The outer ring portion 51 is fixedly connected to the outer shell 10, and the inner ring portion 52 is located inside the outer ring portion 51. The inner ring portion 52 is provided with the aforementioned through hole 521. The mating portion 41 and the coil assembly 30 cooperate to clamp the inner ring portion 52. The outer ring portion 51 and the inner ring portion 52 are connected through the elastic deformation portion 53. The elastic deformation portion 53 can undergo elastic deformation to satisfy the reciprocating linear movement of the sealing member 40, the inner ring portion 52, and the coil assembly 30. Specifically, the elastic deformation portion 53 is a curved strip structure to increase the space for elastic deformation.

[0045] In one embodiment, combined Figure 2 and Figure 3 As shown, the mating part 41 of the seal 40 is a thin sheet with an arc shape, which facilitates the formation of an arc-shaped sealing surface 4121 and reduces volume and saves material. Specifically, the projection of the arc-shaped sealing surface 4121 along the axial direction of the air inlet 111 onto a plane perpendicular to the axis of the air inlet 111 is circular, that is, the outline of the arc-shaped sealing surface 4121 is circular. This design can guide the airflow evenly to all sides.

[0046] In one embodiment, combined Figure 2 , Figure 3 and Figure 4As shown, the coil assembly 30 includes a fixed bracket 31 and a coil winding 32 disposed on the fixed bracket 31. The fixed bracket 31 has a fixing hole 311, and the connecting part 42 is inserted into the fixing hole 311 and fixed to the fixed bracket 31. The fixed bracket 31 and the mating part 41 cooperate to clamp the spring piece 50. By opening the fixing hole 311 on the fixed bracket 31, the connecting part 42 of the sealing member 40 is inserted into the fixing hole 311 and fixed to the fixed bracket 31. Thus, when the energized coil winding 32 moves in the magnetic field formed by the magnet assembly 20, the coil winding 32 can drive the fixed bracket 31 to move, and the fixed bracket 31 then drives the sealing member 40 to move as a whole through the connecting part 42. The connection method between the coil winding 32 and the fixed bracket 31 is not limited. For example, the coil winding 32 can be glued and fixed to the fixed bracket 31. The connecting part 42 and the fixing hole 311 can adopt interference fit, threaded fit, etc., to achieve the fixation of the sealing member 40 and the fixed bracket 31.

[0047] In one embodiment, combined Figure 2 , Figure 3 and Figure 4 As shown, the fixing hole 311 includes a first hole segment 3111 and a second hole segment 3112 arranged sequentially in a direction away from the air inlet 111. The diameter of the second hole segment 3112 is larger than the diameter of the first hole segment 3111. The junction of the second hole segment 3112 and the first hole segment 3111 forms a first annular limiting surface 3113 facing away from the air inlet 111. The connecting part 42 of the sealing member 40 includes a rod part 421 and a head 422. The radial dimension of the head 422 along the fixing hole 311 is larger than the radial dimension of the rod part 421 along the fixing hole 311. The two ends of the rod part 421 are fixedly connected to the mating part 41 and the head 422 respectively. The rod part 421 passes through the first hole segment 3111, and the head 422 is located in the second hole segment 3112 and is locked on the first annular limiting surface 3113. By making the diameter of the second hole segment 3112 larger than the diameter of the first hole segment 3111, a first annular limiting surface 3113 can be formed at the junction of the second hole segment 3112 and the first hole segment 3111. By making the rod portion 421 of the connecting portion 42 pass through the first hole segment 3111, the head portion 422 of the connecting portion 42 is located in the second hole segment 3112 and is locked on the first annular limiting surface 3113, thereby achieving a fixed connection between the sealing member 40 and the fixed bracket 31.

[0048] In one embodiment, the head 422 of the connecting portion 42 is elastic, and the radial dimension of the head 422 along the fixing hole 311 in its natural state is larger than the diameter of the first hole segment 3111. During assembly, the head 422 and the rod portion 421 of the connecting portion 42 are inserted into the first hole segment 3111 of the fixing hole 311. Because the head 422 is elastic, it can shrink to adapt to the diameter of the first hole segment 3111, thereby passing through the first hole segment 3111 and entering the second hole segment 3112. After the head 422 enters the second hole segment 3112, it returns to its original shape, thereby locking onto the first annular limiting surface 3113. Specifically, the sealing member 40 can be integrally formed from an elastic material, which not only allows the head 422 of the connecting portion 42 to pass through the first hole segment 3111, but also enhances the pressing effect of the mating portion 41 on the spring piece 50, and further enhances the sealing effect of the arc-shaped sealing surface 4121 on the air inlet 111.

[0049] In one embodiment, such as Figure 2 As shown, the inner wall surface of the outer casing 10 has a second annular limiting surface 114 facing the magnet assembly 20. The second annular limiting surface 114 abuts against the periphery of one side of the spring piece 50. The exhaust device also includes a sealing ring 60, which abuts against the periphery of the spring piece 50 facing away from the second annular limiting surface 114. The magnet assembly 20 abuts against the side of the sealing ring 60 facing away from the spring piece 50. By providing a sealing ring 60 between the spring piece 50 and the magnet assembly 20, one side of the sealing ring 60 abuts against the magnet assembly 20, and the other side of the sealing ring 60 abuts against the periphery of the spring piece 50, the periphery of the spring piece 50 is pressed tightly against the second annular limiting surface 114 of the outer casing 10, thereby fixing the edge of the spring piece 50. Specifically, the sealing ring 60 presses the outer ring portion 51 of the spring piece 50 against the second annular limiting surface 114. In addition, the sealing ring 60 can also prevent external liquids, dust, etc. from entering, providing a good working environment for the coil assembly 30.

[0050] In one embodiment, such as Figure 2 As shown, the magnet assembly 20 includes an iron core 21 and a permanent magnet 22. The iron core 21 has a mounting groove 211, and the permanent magnet 22 is disposed in the mounting groove 211. The coil assembly 30 is at least partially disposed in the mounting groove 211 and surrounds the permanent magnet 22. Specifically, the side of the sealing ring 60 facing away from the spring piece 50 abuts against the iron core 21, and the side of the iron core 21 facing away from the sealing ring 60 abuts against the inner wall of the outer casing 10, thereby achieving axial positioning of the iron core 21. The permanent magnet 22 can be bonded and fixed to the iron core 21.

[0051] In one embodiment, such as Figure 2As shown, the exhaust device also includes a conductive terminal 70, which is disposed on the housing 10 and electrically connected to the coil winding 32. The conductive terminal 70 can be connected to an external power source, thereby providing current to the coil winding 32 for operation. Specifically, the conductive terminal 70 is located outside the magnet assembly 20, the sealing ring 60 has a notch, and the lead wire 321 of the coil winding 32 extends from the notch of the sealing ring 60 to the outside of the magnet assembly 20, and then is wound and fixed on the conductive terminal 70 to achieve electrical connection.

[0052] In one embodiment, such as Figure 6 As shown, the outer casing 10 includes a first casing 11 and a second casing 12. The second casing 12 is detachably connected to the first casing 11. The first casing 11 and the second casing 12 cooperate to form a receiving cavity, in which the magnet assembly 20, the coil assembly 30, and the seal 40 are all disposed. The first casing 11 and the second casing 12 are designed to be detachable, which facilitates the assembly and disassembly of the magnet assembly 20, the coil assembly 30, and the seal 40. Specifically, the air inlet 111 and the exhaust 113 are both opened in the first casing 11, the second annular limiting surface 114 is disposed in the first casing 11, the side of the magnet assembly 20 facing away from the sealing ring 60 abuts against the second casing 12, and the conductive terminal 70 is disposed on the second casing 12.

[0053] In one embodiment, such as Figure 6 As shown, the second housing 12 has a wire management groove 121 and a clearance groove 122 on its adjacent two sides, respectively. The wire management groove 121 and the clearance groove 122 are connected. The second housing 12 has a protruding corner 123 at the junction of the wire management groove 121 and the clearance groove 122. The lead wire 321 of the coil winding 32 enters the clearance groove 122 after passing through the wire management groove 121. After passing the bottom surface of the protruding corner 123, that is, the side of the protruding corner 123 facing the clearance groove 122, it is wound around the conductive terminal 70. By setting the cable management groove 121, the direction of the lead wire 321 can be guided, so that the lead wire 321 is arranged neatly. By setting the clearance groove 122, and setting the protruding corner 123 at the junction of the cable management groove 121 and the clearance groove 122, when the lead wire 321 passes through the cable management groove 121 and enters the clearance groove 122, it can pass through the bottom surface of the protruding corner 123. In this way, the lead wire 321 can be fixed and protected, pressing down the lead wire 321 to prevent the lead wire 321 from sticking up.

[0054] In one embodiment, such as Figure 6 As shown, the exhaust device also includes a threaded fastener 80, and the first housing 11 and the second housing 12 are fixedly connected by the threaded fastener 80.

[0055] This application also provides an electronic blood pressure monitor, including an air supply device, a cuff, and the aforementioned exhaust device. The cuff has an inner cavity, and the air supply device and the air inlet 111 are both connected to the inner cavity. The air supply device can inflate the cuff by injecting gas into the inner cavity. When it is necessary to reduce the air pressure in the inner cavity of the cuff, the control coil assembly 30 drives the sealing member 40 to move away from the air inlet 111, so that the arc-shaped sealing surface 4121 of the sealing member 40 opens the air inlet 111, thereby allowing the gas in the inner cavity of the cuff to be discharged into the outer casing 10 through the air inlet 111 to achieve exhaust. Compared with a flat surface, the arc-shaped sealing surface 4121 can reduce the impact of high-speed airflow on the sealing member 40, thereby reducing the wear of the sealing member 40, extending the service life of the exhaust device, and also reducing vibration and noise caused by gas flow, while also avoiding system instability caused by sudden changes in gas pressure. In addition, the arc-shaped sealing surface 4121 and the air inlet 111 can form an arc-shaped air passage, which can not only improve the control accuracy of gas flow, but also help manage the gas flow path and reduce unnecessary losses.

[0056] An air pump can be selected as the specific air supply device.

[0057] It should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An exhaust device, characterized in that, The device includes a housing, a magnet assembly, a coil assembly, and a seal. The magnet assembly, the coil assembly, and the seal are all disposed within the housing. The housing has an air inlet. The coil assembly is at least partially located in the magnetic field formed by the magnet assembly. The seal is connected to the coil assembly and has an arc-shaped sealing surface facing the air inlet. When energized, the coil assembly can drive the seal to move towards or away from the air inlet, thereby blocking or opening the air inlet through the arc-shaped sealing surface.

2. The exhaust device according to claim 1, characterized in that: The exhaust device also includes a spring sheet disposed inside the housing. The four edges of the spring sheet are fixedly connected to the housing. The seal, the coil assembly, and the spring sheet are fixedly connected. When the coil assembly is energized, it drives the seal to move from the initial position toward the direction close to the air inlet, and the spring sheet undergoes elastic deformation.

3. The exhaust device according to claim 2, characterized in that: The spring sheet has a through hole, the coil assembly is located on the side of the spring sheet facing away from the air inlet, the sealing member includes a mating part and a connecting part that are fixedly connected, the mating part is located on the side of the spring sheet facing the air inlet, the mating part has the arc-shaped sealing surface, the connecting part passes through the through hole and is fixedly connected to the coil assembly, and the mating part cooperates with the coil assembly to clamp the spring sheet.

4. The exhaust device according to claim 3, characterized in that: The coil assembly includes a fixed bracket and a coil winding fixedly mounted on the fixed bracket. The fixed bracket has a fixing hole, and the connecting part is inserted into the fixing hole and fixed to the fixed bracket. The fixed bracket and the mating part cooperate to clamp the spring piece.

5. The exhaust device according to claim 4, characterized in that: The fixing hole includes a first hole segment and a second hole segment arranged sequentially in a direction away from the air inlet. The diameter of the second hole segment is larger than the diameter of the first hole segment. The junction of the second hole segment and the first hole segment forms a first annular limiting surface facing away from the air inlet. The connecting part includes a rod and a head. The radial dimension of the head along the fixing hole is larger than the radial dimension of the rod along the fixing hole. The two ends of the rod are fixedly connected to the mating part and the head, respectively. The rod passes through the first hole segment, and the head is located in the second hole segment and is engaged with the first annular limiting surface.

6. The exhaust device according to claim 2, characterized in that: The inner wall of the housing has a second annular limiting surface facing the magnet assembly. The second annular limiting surface abuts against the periphery of one side of the spring piece. The exhaust device also includes a sealing ring. The sealing ring abuts against the periphery of the spring piece facing away from the second annular limiting surface. The magnet assembly abuts against the side of the sealing ring facing away from the spring piece.

7. The exhaust device according to any one of claims 1-6, characterized in that: The outer casing is provided with an air nozzle, and the air nozzle has an air inlet that communicates with the interior of the outer casing. The air nozzle has a boss formed on the inner wall of the outer casing. A mating plane is provided on the side of the boss facing the arc-shaped sealing surface. The mating plane is perpendicular to the axis of the air inlet. The arc-shaped sealing surface closes the air inlet by abutting against the mating plane.

8. The exhaust device according to any one of claims 1-6, characterized in that: The seal is elastic.

9. The exhaust device according to any one of claims 1-6, characterized in that: The magnet assembly includes an iron core and a permanent magnet. The iron core is provided with a mounting groove, the permanent magnet is disposed in the mounting groove, and the coil assembly is at least partially disposed in the mounting groove and arranged around the permanent magnet.

10. An electronic blood pressure monitor, characterized in that, It includes an air supply device, a cuff, and an exhaust device as described in any one of claims 1-9, wherein the cuff has an inner cavity, and the air supply device and the air inlet are both in communication with the inner cavity.

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