Voice coil motor for respiratory support equipment, switch valve and respiratory support equipment

Abstract

The invention provides a voice coil motor for respiratory support equipment, a switch valve and the respiratory support equipment, the voice coil motor comprises a shell, a motor shaft is arranged in the middle of the shell, a flexible elastic part is arranged at the upper part of the motor shaft, and a guide part is arranged at the lower part of the motor shaft and is used for ensuring that the motor shaft does linear motion; and a coil support is arranged outside the guide part, a coil is fixed to the coil support, and a permanent magnet is arranged outside the coil support. The voice coil motor provided by the invention is provided with the flexible elastic piece to provide resistance and support for the motor shaft, and is also provided with the linear bearing, the motor shaft of the voice coil motor is ensured to do linear motion without fluctuation through the combined action of the flexible elastic piece and the linear bearing, and the permanent magnet in the voice coil motor is arranged on the outer side of the coil bracket. Compared with an existing voice coil motor with a permanent magnet on the inner side of a coil, the possibility that the motor shaft is magnetized by the permanent magnet is reduced, and the linear motion stability of the motor shaft is improved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a voice coil motor for breathing support equipment, a switch valve and breathing support equipment. Background technique [0002] Respiratory support equipment (such as ventilator) is an instrument used to replace or assist human respiratory function. It is suitable for artificial respiration for patients with respiratory failure or even stop breathing. It is an important tool to save the lives of some critically ill patients. , has been widely used in the medical field and is deeply loved by the majority of patients. At present, the ventilator on the market uses a turbine for air supply. Due to the unstable air flow caused by the rotation of the turbine, its air supply pressure and flow rate are often unstable. , bringing discomfort to the patient. [0003] The voice coil motor is a special form of direct drive motor. The working principle is that the electr...

AI Technical Summary

Problems solved by technology

[0002] Respiratory support equipment (such as ventilator) is an instrument used to replace or assist human respiratory function. It is suitable for artificial respiration for patients with respiratory failure or even stop breathing. It is an important tool to save the lives of some critically ill patients. , has been widely used in the medical field and is deeply loved by the majority of patients. At present, the ventilator on the market uses a turbine for air supply. Due to the unstable air flow caused by the rotation of the turbine, its air supply pressure and flow rate are often unstable. , bringing discomfort to the patient

[0003] The voice coil motor is a special form of direct drive motor. The working principle is that the electrified coil will generate force when placed in the magnetic field. The magnitude of the force is proportional to the current applied to the coil. The movement form of the voice coil motor manufactured based on this principle It can be a straight line or an arc. At present, the voice coil motors on the market use two shrapnels to provide elastic force, but it is difficult to ensure the concentricity of the two shrapnels during actual assembly, which causes the motor shaft to fluctuate when it moves in a straight line. At the same time, the two shrapnels The elastic force of the shrapnel is too large, and the voice coil motor needs to provide more power to achieve force balance

Voice coil motors used in respiratory equipment have stricter requirements on the linear motion of the motor shaft. The permanent magnets of the existing voice coil motors are all equipped with inner coil rings, and the motor shafts are mostly made of stainless steel in order to require a certain degree of rigidity. The permanent magnet placed in the inner ring of the coil will magnetize the motor shaft, which will further affect the accuracy of the linear motion of the motor shaft

[0004] Chinese utility model patent CN101856534A discloses a three-way pressure balance valve and a medical ventilator. The three-way pressure balance valve includes a three-way integrated pipeline. The mouths are directly connected, and a diaphragm is provided at the inner end of the air source port, and the air source port and the release port are connected through the space above the diaphragm; the diaphragm is connected with a driver for driving , down action to adjust the size of the gap between the air source port and the release port, the driver is a voice coil motor, the voice coil motor is provided with damping springs on one side or both sides of the electromagnetic coil to support the dynamic core and transmission shaft, but it is difficult to ensure the concentricity when setting two shrapnels in actual assembly, which will cause the motor shaft to fluctuate when it moves in a straight line. At the same time, the elastic force is too large, and the voice coil motor needs to provide more power to achieve force balance.

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