Search

CN-224220551-U - Expiratory valve with noise reduction function and anesthesia machine or breathing machine

CN224220551UCN 224220551 UCN224220551 UCN 224220551UCN-224220551-U

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to an exhalation valve with a noise reduction function and an anesthesia machine or a breathing machine. The exhalation valve comprises a valve seat, a valve plate, an exhalation valve diaphragm and a bowl-shaped diaphragm, wherein the valve seat comprises an upper valve seat and a lower valve seat, the upper valve seat is communicated with the lower valve seat through a valve port, the valve plate comprises an upper valve plate and a lower valve plate which are connected through a connecting rod, the bowl-shaped diaphragm is clamped on the upper valve plate, the exhalation valve diaphragm is clamped on the lower valve plate, the lower valve plate is arranged in an air cavity chamber of the upper valve seat, the bowl-shaped diaphragm deforms downwards to enable the exhalation valve diaphragm to cover the valve port, an air cavity of the upper valve seat is communicated with a waste discharge channel, an air cavity of the lower valve seat is communicated with a driving air B channel, and the air cavities of the upper valve seat and the lower valve seat are surrounded by walls with a plurality of air holes. The damping is added at the near air inlet end of the airflow to balance the vibrating diaphragm, and the orifice plate gap is arranged to dissipate the vibration energy.

Inventors

  • Duan Jinmin

Assignees

  • 河北谊安奥美医疗设备有限公司

Dates

Publication Date
20260512
Application Date
20241230

Claims (10)

  1. 1. An exhalation valve with a noise reduction function is characterized by comprising a valve seat, a valve plate, an exhalation valve diaphragm and a bowl-shaped diaphragm; The valve seat comprises an upper valve seat and a lower valve seat, and the upper valve seat is communicated with the lower valve seat through a valve port; The valve plate comprises an upper valve plate and a lower valve plate which are connected through a connecting rod, wherein a bowl-shaped diaphragm is clamped on the upper valve plate, and an exhalation valve diaphragm is clamped on the lower valve plate; The air chamber of the upper valve seat is communicated with the waste discharge channel, and the air chamber of the lower valve seat is communicated with the driving air B channel; the air chambers of the upper valve seat and the lower valve seat are surrounded by walls with a plurality of air holes.
  2. 2. The exhalation valve with the noise reduction function according to claim 1, wherein a driving air cavity is arranged between the bowl-shaped diaphragm and the cavity wall of the exhalation valve installation cavity, and a driving air A rectifying plate is arranged in the driving air cavity; The driving gas A rectifying plate is of a disc-shaped structure and comprises a disc bottom and a convex edge which is annularly arranged along the edge of the disc bottom, wherein the convex edge is in a zigzag shape, and a plurality of air holes are formed in the disc bottom.
  3. 3. The exhalation valve with noise reduction function according to claim 2, wherein the area of the air holes on the drive gas a rectifying plate is 20% or more of the total area of the drive gas a rectifying plate.
  4. 4. The exhalation valve with the noise reduction function according to claim 1 is characterized in that a supporting seat is arranged on a bottom plate of the lower valve seat, a driving gas B rectifying plate in a circular plate shape is arranged on the supporting seat, and a plurality of air holes are formed in the driving gas B rectifying plate.
  5. 5. The exhalation valve with noise reduction function according to claim 4, wherein the support base is composed of a plurality of support rods in annular intervals, and gaps with the same width are formed between any two support rods.
  6. 6. The exhalation valve with noise reduction function according to claim 4, wherein the area of the air holes on the drive gas B rectifying plate is 20% or more of the total area of the drive gas B rectifying plate.
  7. 7. The exhalation valve with noise reduction function according to claim 1, characterized in that the bowl-shaped diaphragm and/or the exhalation valve diaphragm has a shore hardness of 85 degrees, the thickness of which increases.
  8. 8. The exhalation valve having noise reduction function according to claim 1, wherein the exhalation valve membrane is fixedly connected to the lower valve plate by adhesion or encapsulation.
  9. 9. The exhalation valve with noise reduction function according to claim 1, characterized in that the air hole area on the wall of the air chamber of the upper valve seat and the lower valve seat is 20% or more of the total wall area of the air chamber.
  10. 10. An anesthesia machine or a respirator, characterized in that it is equipped with an exhalation valve with noise reduction function according to any one of claims 1-9.

Description

Expiratory valve with noise reduction function and anesthesia machine or breathing machine Technical Field The utility model belongs to the technical field of medical equipment, and particularly relates to an exhalation valve with a noise reduction function and an anesthesia machine or a breathing machine. Background The exhalation valve is an important part in the circuit of the anesthesia machine, when the patient needs to exhale, the exhalation valve will be opened at this time, but in order to keep the lungs at a certain positive end-expiratory pressure, a PEEP value is generally set, which is called positive end-expiratory pressure, and this value is used to prevent the patient from exhaling out of the lungs, so that the lungs are not filled with air, the alveoli will stick together, and when mechanical ventilation is performed again, there is a risk that the mucous membrane of the lungs will be torn, so that a certain end-expiratory pressure needs to be maintained, so that the lungs will not stick together. To maintain this pressure, the valve ports of the exhalation valve are not fully open. Always keep a certain opening degree, and the air passage always keeps a certain pressure in the exhaust process. Typically this pressure is up to 70cmH 2 O, and fresh gas is supplied continuously, typically 2L/min, and in large cases 5L/min, which is the basic condition and environment for ventilation of the entire circuit, in order to ensure continuous leakage of the replenishment circuit and patient anesthesia and oxygen consumption. The respiration of a general patient is divided into 3 stages, namely inhalation, breath-hold and exhalation, and in the process, the existing anesthesia can generate great noise and abnormal sound because the diaphragm sealing the exhalation valve port generates intense vibration due to the impact of air flow. The air flow is beaten to generate vortex street. After the gas vortex falls, the gas vortex impacts the gas path wall of the loop, and when the low-order mode of the gas path wall is too frequent, resonance can occur, and severe vibration and noise are generated. In particular, the breath-hold time, on the one hand, requires pressure to compress the exhalation valve port, on the other hand, the drive gas continuously compresses the folding bladder, and the excess drive gas is forced to be discharged from the exhalation valve port, and the continuously accumulated fresh gas in the loop is added. Fresh gas exceeding the circuit volume must also be vented from the exhalation valve port. This results in the exhalation valve being required to be compressed and to be vented in the event of compression, which necessarily results in noise. The structure of the existing exhalation valve is shown in figure 1, the exhalation valve comprises a valve seat 1, a valve plate 2, an exhalation valve membrane 3 and a bowl-shaped membrane 4, the valve seat 1 comprises an upper valve seat 1-1 and a lower valve seat 1-2, the upper valve seat 1-1 and the lower valve seat 1-2 are communicated through a valve port 1-5, the valve plate 2 comprises an upper valve plate 2-2 and a lower valve plate 2-3 which are connected through a connecting rod 2-1, the bowl-shaped membrane 4 is clamped on the upper valve plate 2-2, the exhalation valve membrane 3 is clamped on the lower valve plate 2-3, the lower valve plate 2-3 is arranged in an air cavity of the upper valve seat 1-1, the bowl-shaped membrane 4 deforms downwards to enable the exhalation valve membrane 3 to cover the valve port 1-5, the air cavity of the upper valve seat 1-1 is communicated with a waste gas discharge channel 5, the air cavity of the lower valve seat 1-2 is communicated with a driving gas B channel 6, and the air cavities of the upper valve seat 1-2 and the lower valve seat 1-2 are formed by spaced struts. The motion principle of the exhalation valve is that high-pressure gas of 0 to 100cmH 2 O is used as driving gas to fill the driving gas chamber, so that the valve plate of the exhalation valve is pushed to move downwards, the valve port is pressed by the exhalation valve membrane, and when the pressure of the gas introduced into the driving gas chamber is reduced or increased, the opening degrees of the exhalation valve membrane and the valve port are different. The exhaust gases are also different. For these abnormal sounds, the present utility model analyzes that severe vibration and collision of the exhalation valve membrane and the valve port are the main reasons, and then the reason for generating the collision is mainly the following five factors: 1. Because the driving air A channel is arranged on the edge of the driving air cavity at the communication port of the driving air cavity, air flow always blows to one edge of the bowl-shaped diaphragm when entering the driving air cavity, and then the exhalation valve diaphragm is unstable and collides with the valve port. 2. When the driving gas B enters the valve port, the dri