A piezoelectric micro leak rate valve

Abstract

A piezoelectric micro leak rate valve can be applied to a sphygmomanometer. An oscillation unit is provided inside the sphygmomanometer. The leak rate valve includes a housing and a vibrating piece. An air inlet channel and an air outlet channel are provided on the housing, and the air inlet channel and the air outlet channel are connected to each other through a connection cavity. The vibrating piece is arranged in the connection cavity, and one end of it extends out of the housing and is connected to the oscillation unit, so that the vibrating piece can vibrate at different frequencies according to the signal input by the oscillation unit. The vibrating piece has a first state in which it is in a vibrating and arched state and a second state in which it is in a relaxed and flat state. When the vibrating piece is in the first state, the connection between the air inlet channel and the air outlet channel is blocked, and when the vibrating piece is in the second state, the connection between the air inlet channel and the air outlet channel is connected. Among them, the process of uniform air leakage and rapid air release is realized by controlling the frequency of the vibrating piece to switch between the first state and the second state.

Description

Technical Field

[0001] The present invention relates to the field of leak rate valves, and specifically to a piezoelectric micro leak rate valve. Background Art

[0002] At present, for a descending type sphygmomanometer, after connecting the CUFF to the arm of the person to be measured, a motor is used to quickly inflate the pressure to a suitable range, and then a leak rate valve connected to the CUFF is used to leak air at a constant speed. The measuring component detects the blood pressure of the human body during the constant-speed air leakage process. After obtaining the result, the residual air pressure is quickly discharged through a deflation valve to avoid discomfort caused by the long-term compression of the arm of the person to be measured.

[0003] Currently, the leak rate valve and the deflation valve used in sphygmomanometers on the market are products that act separately, resulting in a relatively complex structure of the sphygmomanometer. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] To solve the above problems, a piezoelectric micro leak rate valve provided by the present invention has the functions of leaking air at a uniform speed and quickly deflating.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A piezoelectric micro leak rate valve is applied to a sphygmomanometer. An oscillation unit is provided in the sphygmomanometer. The piezoelectric micro leak rate valve includes:

[0009] A housing, an air inlet channel and an air outlet channel are provided on the housing, and the air inlet channel and the air outlet channel are connected to each other through a connection cavity;

[0010] A vibrating plate is arranged in the connection cavity, one end of which extends out of the housing and is connected to the oscillation unit, so that the vibrating plate can vibrate at different frequencies according to the signal input by the oscillation unit;

[0011] Among them, the vibrating plate has a first state in which it vibrates and arches and a second state in which it is relaxed and flat. When the vibrating plate is in the first state, the connection between the air inlet channel and the air outlet channel is blocked. When the vibrating plate is in the second state, the connection between the air inlet channel and the air outlet channel is connected; the leak rate can be adjusted by controlling the frequency at which the vibrating plate switches back and forth between the first state and the second state.

[0012] Preferably, the vibrating plate is arranged facing the air outlet channel. When the vibrating plate is in the first state, the middle part of the vibrating plate arches and blocks the interface between the air outlet channel and the connection cavity.

[0013] Preferably, the vibrating plate is arranged perpendicular to the air outlet channel.

[0014] Preferably, the piezoelectric micro leak rate valve further includes a soft buffer member disposed at the interface between the air outlet passage and the connection cavity, and the vibration piece can be pressed against the soft buffer member when in the first state.

[0015] Preferably, the vibration piece is a piezoelectric ceramic piece, and a copper fixing piece is further connected to the lower side of the housing. The copper fixing piece covers the outside of the vibration piece and abuts against the edge of the vibration piece, and ventilation holes are also provided on the copper fixing piece.

[0016] (III) Beneficial effects

[0017] The beneficial effects of the present invention are as follows: A piezoelectric micro leak rate valve can be applied to a sphygmomanometer. An oscillation unit is provided in the sphygmomanometer. The leak rate valve includes a housing and a vibration piece. An air inlet passage and an air outlet passage are provided on the housing, and the air inlet passage and the air outlet passage are connected to each other through a connection cavity; the vibration piece is disposed in the connection cavity, and one end thereof extends out of the housing and is connected to the oscillation unit so that the vibration piece can vibrate at different frequencies according to the signal input by the oscillation unit; the vibration piece has a first state in which it vibrates and arches and a second state in which it relaxes and is flat. When the vibration piece is in the first state, the connection between the air inlet passage and the air outlet passage is blocked, and when the vibration piece is in the second state, the connection between the air inlet passage and the air outlet passage is connected. Among them, the process of uniform air leakage and rapid air release is realized by controlling the frequency of the vibration piece switching between the first state and the second state. Description of the drawings

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0019] Figure 1 is a schematic diagram of the overall external structure of an embodiment of the present invention;

[0020] Figure 2 is a sectional view of this embodiment when the vibration piece is in the first state;

[0021] Figure 3 is a sectional view of this embodiment when the vibration piece is in the second state;

[0022] In the figure: 1 housing, 2 vibration piece, 3 soft buffer member, 4 copper fixing piece, 11 air inlet passage, 12 air outlet passage, 13 connection cavity. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Referring to the attached Figures 1 to 3 , a piezoelectric micro leak rate valve is applied to a sphygmomanometer. An oscillation unit is provided in the sphygmomanometer. The piezoelectric micro leak rate valve includes:

[0025] A housing 1, on which an air inlet channel 11 and an air outlet channel 12 are provided. The air inlet channel 11 and the air outlet channel 12 are connected to each other through a connection cavity 13;

[0026] A vibrating piece 2 is arranged in the connection cavity 13. One end of the vibrating piece 2 extends out of the housing 1 and is connected to the oscillation unit, so that the vibrating piece 2 can vibrate at different frequencies according to the signal input by the oscillation unit;

[0027] Wherein, the vibrating piece 2 has a first state in which it is in a vibrating arched state and a second state in which it is in a relaxed and flat state. When the vibrating piece 2 is in the first state, the connection between the air inlet channel 11 and the air outlet channel 12 is blocked. When the vibrating piece 2 is in the second state, the connection between the air inlet channel 11 and the air outlet channel 12 is connected. By controlling the frequency of the vibrating piece 2 to switch back and forth between the first state and the second state, the leak rate can be adjusted.

[0028] Specifically, in this embodiment, the vibration principle of the vibrating piece 2 is preferably the same as that of the buzzer piece of a piezoelectric buzzer. The oscillation unit can adopt an existing multivibrator and impedance matcher. The sphygmomanometer applied in this embodiment further includes an inflation motor, a CUFF, a controller and a display screen. When in use, the CUFF needs to be connected to the arm of the person to be measured first, and then the CUFF is inflated and pressurized to a suitable range by the inflation motor. After that, during the process of the CUFF leaking air at a constant speed, the blood pressure of the person to be measured is detected. After the detection is completed, the residual air pressure in the CUFF is quickly discharged.

[0029] In this embodiment, the process of uniform air leakage and rapid air release is achieved by controlling the frequency of the vibration piece 2 to switch back and forth between the first state and the second state. Of course, in this embodiment, the vibration piece 2 also has a third state in which it arches and expands the space of the connection cavity 13. The third state is actually the reverse state of the first state. The first state and the third state are respectively two opposite peak positions of a vibration cycle of the vibration piece 2. The third state has no special function in this embodiment and will not be described below. After applying this embodiment to a sphygmomanometer, when the inflation motor starts to inflate the CUFF, the oscillation unit inputs a high-frequency signal to make the vibration piece 2 vibrate at a high frequency, that is, the vibration piece 2 undergoes high-frequency transformation between the first state and the second state, making the connection cavity 13 approximately blocked. At this time, very little air enters the air outlet channel 12 through the air inlet channel 11, and the inflation speed is much greater than the air leakage speed, so that the CUFF can be quickly inflated; when the CUFF pressurization is completed and the sphygmomanometer starts to detect, the vibration frequency of the vibration piece 2 is reduced according to the actual detection needs, slightly increasing the ventilation volume of the connection cavity 13 and also controlling the air leakage speed, so that the air in the CUFF enters the connection cavity 13 through the air inlet channel 11 and then flows out of the air outlet channel 12 uniformly and slowly to achieve uniform air leakage until the sphygmomanometer detection is completed; after the sphygmomanometer detection is completed, the vibration of the vibration piece 2 is stopped, and the vibration piece 2 is kept in the second state, so that the air inlet channel 11 and the air outlet channel 12 can be connected to the greatest extent, and the ventilation volume of the connection cavity 13 increases greatly, realizing the rapid air release process of the CUFF. This piezoelectric micro air leakage valve simultaneously has the functions of uniform air leakage and rapid air release, is multi-functional in one body, and the overall structure is also very simple. In this embodiment, the operating frequency of the vibration piece is between 80KHz and 120KHz.

[0030] Further, the vibration piece 2 is arranged facing the air outlet channel 12, so that the vibration piece 2 is arranged as a side wall of the connection cavity 13. When the vibration piece 2 is in the first state, the middle part of the vibration piece 2 arches and blocks the interface between the air outlet channel 12 and the connection cavity 13, which is equivalent to fitting the two side walls of the connection cavity 13 together to block the connection between the air inlet channel 11 and the air outlet channel 12.

[0031] Further, in a more optimal embodiment, the vibration piece 2 is arranged perpendicular to the air outlet channel 12, that is, the interface between the air outlet channel 12 and the connection cavity 13 is located above the center of the vibration piece 2. When the vibration piece 2 is in the first state, the vibration amplitude at the center position is the largest and the height reached is also the highest. Under the condition of the same shape and height of the connection cavity 13, when the vibration piece 2 is perpendicular to the air outlet channel 12, the vibration amplitude required for the vibration piece 2 to block the air outlet channel 12 is the smallest.

[0032] Further, to prevent the vibrating piece 2 from coming into hard contact with the plastic housing 1 during movement, which may cause damage to the vibrating piece 2 and the problem that the connection cavity 13 cannot be completely blocked and sealed, in this embodiment, the piezoelectric micro leak rate valve further includes a soft buffer member 3. The soft buffer member 3 is disposed at the interface between the air outlet channel 12 and the connection cavity 13. When the vibrating piece 2 is in the first state, it can be pressed against the soft buffer member 3, and at the same time, the soft buffer member 3 and the vibrating piece 2 form a surface-to-surface contact, achieving the purpose that the air outlet channel 12 can be completely blocked in the first state of the vibrating piece 2.

[0033] Further, regarding the application and installation structure of the vibrating piece 2, in this embodiment, the vibrating piece 2 is a piezoelectric ceramic piece. A copper fixing piece 4 (which can also be an iron fixing piece) is further connected to the lower side of the housing 1. The copper fixing piece 4 covers the outside of the vibrating piece 2 and abuts against the edge of the vibrating piece 2. The copper fixing piece 4 is also provided with ventilation holes. The piezoelectric ceramic piece described in this embodiment is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic piece. After polarization and aging treatment, it is bonded to the copper fixing piece 4. When a voltage is applied to both ends of the piezoelectric material and the metal material, due to the piezoelectric effect, the vibrating piece 2 will generate mechanical deformation and vibrate back and forth. The copper fixing piece 4 in this embodiment not only plays a role in protecting the vibrating piece 2 from external interference or damage, but also the ventilation holes provided thereon can balance the air pressure difference between the space formed by enclosing the vibrating piece 2 and the copper fixing piece 4 and the external environment, so that the vibration of the vibrating piece 2 is not affected by air pressure changes.

[0034] In addition, the vibrating piece 2 will also generate a certain sound when vibrating. The user can also judge the current state of the sphygmomanometer according to this sound, making the use of the sphygmomanometer more convenient.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and do not limit the exemplary embodiments according to the present application. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric micro leak rate valve is applied to a sphygmomanometer. An oscillation unit is provided in the sphygmomanometer. It is characterized in that, The piezoelectric micro leakage rate valve includes: A housing (1), on which an air inlet passage (11) and an air outlet passage (12) are provided, and the air inlet passage (11) and the air outlet passage (12) are interconnected through a connection cavity (13); A vibrating piece (2), which is arranged in the connection cavity (13), and one end of it extends out of the housing (1) and is connected to an oscillation unit, so that the vibrating piece (2) can vibrate at different frequencies according to the signal input by the oscillation unit; Wherein, the vibrating piece (2) has a first state in which it vibrates and arches and a second state in which it relaxes and is flat. When the vibrating piece (2) is in the first state, the connection between the air inlet passage (11) and the air outlet passage (12) is blocked, and when the vibrating piece (2) is in the second state, the connection between the air inlet passage (11) and the air outlet passage (12) is connected; by controlling the frequency of the vibrating piece (2) to switch back and forth between the first state and the second state, the leakage rate can be adjusted.

2. The piezoelectric micro leak rate valve according to claim 1, characterized in that, The vibrating piece (2) is arranged facing the air outlet passage (12). When the vibrating piece (2) is in the first state, the middle part of the vibrating piece (2) arches and blocks the interface between the air outlet passage (12) and the connection cavity (13).

3. The piezoelectric micro leakage rate valve according to claim 2, characterized in that, The vibrating piece (2) is arranged perpendicular to the air outlet passage (12).

4. The piezoelectric micro leakage rate valve according to claim 2, characterized in that It further includes a soft buffer member (3), which is arranged at the interface between the air outlet passage (12) and the connection cavity (13), and when the vibrating piece (2) is in the first state, it can be pressed against the soft buffer member (3).

5. The piezoelectric micro leak rate valve according to claim 1, characterized in that, The vibrating piece (2) is a piezoelectric ceramic piece, and a copper fixing piece (4) is further connected to the lower side of the housing (1). The copper fixing piece (4) covers the outside of the vibrating piece (2) and abuts against the edge of the vibrating piece (2), and ventilation holes are also provided on the copper fixing piece (4).

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