CN115607796A - A low-noise solenoid valve for ventilator with high control precision and high sensitivity and ventilator - Google Patents

Abstract

The invention provides a low-noise electromagnetic valve for a respirator with high control precision and high sensitivity and the respirator, and belongs to the technical field of electromagnetic valves. The problems of low flow control precision, insufficient sensitivity and low noise of the electromagnetic valve of the existing respirator are solved. The electromagnetic valve comprises a static valve core, an electromagnetic coil, a shell, a movable valve core, a spring sheet seat, a plane spring sheet and a pipe connecting port, wherein the static valve core and the movable valve core are armatures; the number of turns of the electromagnetic coil is 1590-1600, the wire diameter is 0.1-0.12mm, the mass of the movable valve core is 1-2g, the length L range of the static valve core is 12-13mm, and the diameter D range is 4-6mm. The invention is suitable for the requirements of high-requirement control precision, sensitivity and low noise of the breathing machine.

Description

A low-noise solenoid valve and a ventilator with high control precision and high sensitivity suction machine

technical field

The invention belongs to the technical field of solenoid valves, and in particular relates to a low-noise solenoid valve for a ventilator and a ventilator with high control precision and high sensitivity.

Background technique

In modern clinical medicine, the ventilator, as an effective means that can provide energy through the outside world instead of the human's own self-ventilation, is widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support therapy and first aid. Resuscitation occupies a very important position in the field of modern medicine. Especially with the ravages of the new coronavirus from the end of 2019 to this year, the demand for ventilators at home and abroad is very large. One of the key components of the ventilator is the solenoid valve. The working principle of the solenoid valve for the ventilator is to generate a current by applying a voltage to the solenoid valve. The current passes through the internal coil of the solenoid valve to generate a magnetic field. The magnetic field is transmitted to the At both ends of the air gap, electromagnetic attraction is generated between the air gap to suck up the armature in the closed state from the valve seat, thereby opening the valve to realize the linear relationship between the input electrical signal and the output flow signal.

Existing solenoid valves of ventilators have the problems of low flow control accuracy, insufficient sensitivity, and low noise. Therefore, it is necessary to design a new solenoid valve to meet the requirements of high control accuracy, high sensitivity, and low noise.

Contents of the invention

In view of this, the present invention aims to propose a low-noise solenoid valve for ventilators with high control precision and high sensitivity, so as to solve the problems of low flow control accuracy, insufficient sensitivity and low noise of the existing solenoid valves of ventilators. question.

In order to achieve the above object, the technical solution created by the present invention is achieved in this way:

A low-noise solenoid valve for a ventilator with high control precision and high sensitivity, including a static valve core, an electromagnetic coil, a casing, a moving valve core, a shrapnel seat, a plane shrapnel and a nozzle. The static valve core and the moving valve core are both The armature, the static spool is fixed at the bottom of the shell, the upper end of the shell is threaded with the shrapnel seat, the nozzle pipe is threaded with the upper part of the shrapnel seat, and the lower end of the moving spool passes through the shrapnel seat and extends into the shell to support the planar shrapnel Set on the upper part of the movable spool, the movable spool can move up and down, the inner ring of the support planar shrapnel supports the movable spool, the outer ring is supported by a support block, the support block is supported by a support plate, and the support plate is supported on the shrapnel seat On; several turns of electromagnetic coils are wound on the static spool and the moving spool;

The number of turns of the electromagnetic coil is 1590-1600, the wire diameter is 0.1-0.12mm, the mass of the moving valve core is 1-2g, the length L of the static valve core ranges from 12-13mm, and the diameter D ranges from 4-6mm;

The nozzle is provided with a central air inlet passage and several air outlet passages, and several air outlet passages are arranged around the central air inlet passage. Initially, under the action of the planar shrapnel, the upper end of the movable valve core cuts off the central air inlet passage and several air outlet passages. The air outlet channel is connected, and there is a gap between the lower end of the moving valve core and the upper end of the static valve core. When the electrical signal is input to the solenoid valve, a magnetic field is formed after the electromagnetic coil is energized. The amount of opening connected between the air passage and the air outlet passage changes, and after the movable valve core is fully opened, the gas flows from the gas inlet of the central air inlet passage into the gas outlet of the outlet passage.

Furthermore, the number of turns of the magnetic coil is 1595, the wire diameter is 0.11 mm, the mass of the moving valve core is 1.5 g, the length L of the static valve core is 12.5 mm, and the diameter D is 5 mm.

Furthermore, the power-on and power-off response times of the solenoid valve are 5 ms and 7 ms respectively; the precision is controlled within the range of ±1%, and the noise is lower than 20 dB.

Furthermore, the planar elastic sheet includes an inner ring, an outer ring and several elastic sheets, the several elastic sheets are evenly arranged between the inner ring and the outer ring, and the two ends of the elastic sheet are respectively connected to the inner ring and the outer ring.

Further, the upper end of the shrapnel seat has a flaring mouth, and a supporting step is provided on the flaring mouth. The supporting plate is a ring structure, the outer ring surface of the supporting plate is arranged on the supporting step, and the inner ring surface of the supporting plate and the movable valve core The groove on the board is matched, and the width of the groove is greater than the thickness of the support plate.

Furthermore, at the beginning, the inner ring surface of the support plate is against the lower wall of the groove. After the power is turned on, the movable valve core moves downward to compress the shrapnel to deform the shrapnel until the inner ring surface of the support plate is against the upper wall of the groove. on the wall.

Furthermore, the planar elastic sheet includes three elastic sheets.

Further, the nozzle includes a small hollow cylinder and a large hollow cylinder coaxially arranged, the large hollow cylinder is fixed on the small hollow cylinder, and the bottom end of the small hollow cylinder is arranged inside the large hollow cylinder, A central air inlet passage is formed inside the small hollow cylinder, and several through air outlet passages are evenly opened on the surface of the annular disk of the large hollow cylinder.

Furthermore, at the beginning, under the action of the planar shrapnel, the upper end of the movable valve core abuts against the bottom end of the central intake passage of the nozzle.

Another object of the invention is to provide a ventilator, including the above-mentioned solenoid valve.

Compared with the prior art, the beneficial effects of the low-noise solenoid valve for ventilators with high control precision and high sensitivity described in the invention are:

(1) The invention creates a low-noise electromagnetic valve for ventilators with high control precision and high sensitivity. The space for the electromagnetic coil to be wound is limited inside the casing, and the temperature rise generated by the electromagnetic coil will affect the flow regulation. Accuracy and operating conditions of the electromagnet. Therefore, it is necessary to achieve a large magnetomotive force at the cost of as little heat as possible under volume constraints; by limiting the number of turns of the electromagnetic coil to 1595 and the wire diameter to 0.11mm, it is possible to achieve a large magnetomotive force with as little heat as possible under volume constraints. A larger magnetomotive force is achieved at a cost, thereby ensuring the accuracy of flow regulation; the accuracy of the electromagnetic valve of the present application is controlled within the range of ±1%.

(2) The present invention creates a low-noise electromagnetic valve for ventilators with high control precision and high sensitivity. The moving valve core, that is, the moving armature, is used as a moving part. The greater the mass, the longer the dynamic response time of the electromagnetic valve. ; Although reducing the quality of the moving spool, that is, the moving armature can improve the dynamic response speed, but according to the structure of the electromagnet magnetic circuit, it can be seen that the moving spool, that is, the moving armature, is too small, which will lead to magnetic saturation and increase the reluctance of the original magnetic circuit , and finally reduce the effective magnetic force lines in the electromagnet; therefore, the structure of the moving valve core should fully consider the quality of the moving armature, and at the same time, the total flux of the effective magnetic force lines should be considered; this application sets the quality of the moving valve core, that is, the moving armature, to 1-2g , while ensuring the magnetic load capacity, the dynamic response speed is improved; the power-on and power-off response times of the solenoid valve of the present application can reach 5 ms and 7 ms respectively.

(3) The present invention creates a low-noise solenoid valve with high control precision and high sensitivity for ventilators. When a static valve core with a short axial length is used, the cross-sectional area of the magnetic flux leakage circuit is reduced. , therefore, the reluctance of the flux leakage magnetic circuit increases, the magnetomotive force generated by the coil is fully utilized, and the thrust density and operating efficiency of the electromagnet in the electromagnetic coil are improved; by limiting the length range of the static spool, that is, the static armature, to 12 -13mm, the diameter range is 2-3mm, which reduces the influence of the movement of the moving valve core on the magnetic flux distribution, thereby reducing the sharp change of the thrust, thereby reducing the noise. The noise of the solenoid valve of this application is lower than 20dB.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a three-dimensional structural schematic diagram of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an embodiment of the invention;

2 is a schematic cross-sectional view of a low-noise solenoid valve for ventilators with high control accuracy and high sensitivity described in the inventive embodiment of the present invention;

Fig. 3 is a schematic diagram of a cross-sectional three-dimensional structure of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 4 is a top view of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 5 is a bottom view of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 6 is a front view of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 7 is a right side view of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 8 is a schematic structural view of a planar shrapnel of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 9 is a schematic diagram of the magnetic circuit structure and electromagnetic analysis of an electromagnet magnetic circuit structure and electromagnetic analysis of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention;

Fig. 10 is a force analysis diagram of a planar shrapnel in use of a low-noise solenoid valve for a ventilator with high control precision and high sensitivity described in an inventive embodiment of the present invention.

Explanation of reference signs:

1. Solenoid valve; 2. Static valve core; 3. Electromagnetic coil; 4. Shell; 5. Moving valve core; 6. Shrapnel seat; 7. Planar shrapnel; 8. Nozzle.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In describing the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation to the invention of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in different embodiments of the invention described below may be combined with each other as long as they do not constitute conflicts with each other.

As shown in Figures 1 to 8, a low-noise solenoid valve for ventilators with high control precision and high sensitivity includes a static valve core 2, an electromagnetic coil 3, a casing 4, a moving valve core 5, a shrapnel seat 6, a plane The shrapnel 7 and the nozzle 8, the static valve core 2 and the moving valve core 5 are all armatures, the static valve core 2 is fixed on the inner bottom of the casing 4, the upper end of the casing 4 is threaded with the shrapnel seat 6, the nozzle pipe 8 and the shrapnel The upper part of the seat 6 is threaded, the lower end of the movable spool 5 passes through the shrapnel seat 6 and extends into the housing 4, and the supporting plane shrapnel 7 is set on the upper part of the movable spool 5, and the movable spool 5 can move up and down. The inner ring of the planar shrapnel 7 supports the moving valve core 5, the outer ring is supported by a support block, the support block is supported by a support plate, and the support plate is supported on the shrapnel seat 6; several turns are wound on the static valve core 2 and the moving valve core 5 electromagnetic coil 3;

The number of turns of the electromagnetic coil 3 is 1590-1600, the wire diameter is 0.1-0.12mm, the mass of the moving spool 5 is 1-2g, the length L of the static spool 2 ranges from 12-13mm, and the diameter D ranges from 4-6mm ;

The nozzle 8 is provided with a central air intake passage and several air outlet passages, and several air outlet passages are arranged around the central air intake passage. Initially, the upper end of the movable valve core 5 is cut off from the center by the action of the planar shrapnel 7. The air passage is connected with several air outlet passages. There is a gap between the lower end of the moving valve core 5 and the upper end of the static valve core 2. When the electric signal is input to the solenoid valve 1, the electromagnetic coil 3 forms a magnetic field after being energized. 3 Move under the action of the magnetic field to realize the change of the opening amount connected between the central air inlet passage and the air outlet passage. After the movable valve core 5 is opened, the gas flows from the gas inlet of the central air inlet passage into the gas outlet of the air outlet passage; the gas flow rate is consistent with the inlet and outlet There is a close relationship between the pressure difference and the opening degree of the moving valve core 5, thereby establishing the relationship between the electric signal of the solenoid valve 1, the mechanical signal of the displacement of the moving valve core 5, and the gas flow signal.

The number of turns of the magnetic coil is 1595, the wire diameter is 0.11 mm, the mass of the moving valve core 5 is 1.5 g, the length L of the static valve core 2 is 12.5 g, and the diameter D is 5 mm. The power-on and power-off response times of the solenoid valve 1 are 5 ms and 7 ms respectively; the precision is controlled within the range of ±1%, and the noise is lower than 20 dB. The solenoid valve has higher flow control precision, higher sensitivity and lower noise, and is suitable for the high requirements of the ventilator.

The planar elastic sheet 7 includes an inner ring, an outer ring and several elastic sheets, the several elastic sheets are evenly arranged between the inner ring and the outer ring, and the two ends of the elastic sheet are respectively connected to the inner ring and the outer ring. The planar elastic sheet 7 includes three elastic sheets. Such an arrangement can better support the movable valve core 5 and be evenly stressed.

The upper end of the shrapnel seat 6 has a flaring mouth, and a supporting step is provided on the flaring. The supporting plate is an annular structure, and the outer ring surface of the supporting plate is arranged on the supporting step. The grooves are matched, and the width of the grooves is greater than the thickness of the support plate.

Initially, the inner ring surface of the support plate is against the lower wall surface of the groove, and under the action of the planar shrapnel 7, the upper end of the moving valve core 5 is against the bottom end of the central intake passage of the nozzle; Finally, the movable valve core 5 moves downwards, compresses the shrapnel to deform the shrapnel until the inner ring surface of the support plate is against the upper wall surface of the groove.

The nozzle 8 includes a coaxially arranged hollow small cylinder and a hollow large cylinder, the hollow large cylinder is fixed on the hollow small cylinder, the bottom of the hollow small cylinder is arranged inside the hollow large cylinder, and the hollow small cylinder A central air inlet channel is formed inside the body, and several through air outlet channels are evenly opened on the surface of the annular disk of the hollow large cylinder.

Figure 9 shows the electromagnetic circuit structure and electromagnetic analysis diagram of the solenoid valve. It can be seen that if the moving valve core/armature 5 is too small, it will lead to magnetic saturation, causing the reluctance of the original magnetic circuit to increase, and finally reduce the electromagnet. The effective magnetic field lines in . Therefore, the optimization of the structure of the moving spool/moving armature 5 not only needs to optimize the quality of the moving armature, but also needs to consider the total magnetic flux of the effective magnetic force lines. Since the effective magnetic flux of the electromagnet is related to the excitation strength of the static spool/armature 2, the casing 4 and the electromagnetic coil 3, the optimal design of the moving spool/armature 5 needs to be matched with other electromagnetic components. The mass equation of the movable spool/armature 5, the magnetic flux equation, the electromagnetic thrust equation, and the parallel equation can be established, and the multi-objective and multi-constraint optimization of the movable armature can be carried out by comprehensively considering the quality of the movable spool/armature 5 and the magnetic load capacity ; The quality of the more suitable moving spool/moving armature 5 is obtained.

As shown in Figure 10, the number of turns of the electromagnetic coil 3 of the present application is 1595, the wire diameter is 0.11mm, the quality of the moving valve core 5 is 1-2g, the length L range of the static valve core 2 is 12-13mm, and the diameter D The force diagram of the planar shrapnel 7 when the solenoid valve is in the range of 4-6mm, it can be seen from the figure that the force distribution of the planar shrapnel 7 is even and the force is small, that is, the moving valve of the solenoid valve When the core 5 moves, the impact on the planar elastic piece 7 and the like is small, so the noise is also small.

The present application also provides a ventilator, including the above-mentioned solenoid valve 1 and a turbine.

The embodiments of the invention disclosed above are only used to help explain the invention. The examples do not exhaustively describe all details, nor limit the invention to the specific implementations described. Many modifications and variations can be made based on the contents of this specification. This description selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims (10)

1. A low-noise electromagnetic valve for a ventilator with high control precision and high sensitivity, characterized in that: it comprises a static valve core (2), an electromagnetic coil (3), a casing (4), a moving valve core (5), The shrapnel seat (6), plane shrapnel (7) and nozzle (8), the static valve core (2) and the moving valve core (5) are all armatures, and the static valve core (2) is fixed inside the casing (4) Bottom, the upper end of the casing (4) is threaded with the shrapnel seat (6), the nozzle pipe (8) is threaded with the upper part of the shrapnel seat (6), and the lower end of the moving valve core (5) extends through the shrapnel seat (6) Arranged inside the shell (4), the supporting plane shrapnel (7) is set on the upper part of the movable valve core (5), the moving valve core (5) can move up and down, and the inner ring of the supporting plane shrapnel (7) supports the moving valve The core (5), the outer ring is supported by a support block, the support block is supported by a support plate, and the support plate is supported on the shrapnel seat (6); several turns of electromagnetic coils are wound on the static valve core (2) and the moving valve core (5). Coil(3); The number of turns of the electromagnetic coil (3) is 1590-1600, the wire diameter is 0.1-0.12mm, the mass of the moving spool (5) is 1-2g, the length L of the static spool (2) ranges from 12-13mm, and the diameter D range is 4-6mm; The connecting nozzle (8) is provided with a central air intake passage and several air outlet passages, and several air outlet passages are arranged around the central air intake passage. Initially, the moving valve core (5) is under the action of the planar shrapnel (7). The upper end of (5) cuts off the central air inlet passage and several air outlet passages, and the lower end of the moving valve core (5) is provided with a gap with the upper end of the static valve core (2). When the electric signal is input to the solenoid valve (1), the electromagnetic After the coil (3) is energized, a magnetic field is formed, and the movable spool (5) moves under the action of the magnetic field of the electromagnetic coil (3), so as to realize the change of the opening volume connected between the central air inlet channel and the air outlet channel, and the movable spool (5) is completely After opening, the gas flows into the gas outlet of the gas outlet channel from the gas inlet of the central air inlet channel. 2. A low-noise solenoid valve for ventilators with high control precision and high sensitivity according to claim 1, characterized in that: the number of turns of the magnetic coil is 1595, the wire diameter is 0.11mm, and the movable valve core The quality of (5) is 1.5g, and the length L of static spool (2) is 12.5mm, and diameter D is 5mm. 3. A low-noise solenoid valve for a ventilator with high control precision and high sensitivity according to claim 2, characterized in that: the response time of the solenoid valve (1) is 5ms and 7ms respectively when it is powered on and when it is powered off ; The accuracy is controlled within ±1%, and the noise is lower than 20dB. 4. A low-noise electromagnetic valve for a ventilator with high control precision and high sensitivity according to claim 1, characterized in that: the planar shrapnel (7) includes an inner ring, an outer ring and several shrapnels, several shrapnels Evenly arranged between the inner ring and the outer ring, and the two ends of the shrapnel are respectively connected with the inner ring and the outer ring. 5. A low-noise solenoid valve for ventilators with high control precision and high sensitivity according to claim 1, characterized in that: the upper end of the shrapnel seat (6) has a flaring mouth, and a support is provided on the flaring mouth Step, the support plate is a ring structure, the outer ring surface of the support plate is arranged on the support step, the inner ring surface of the support plate cooperates with the groove on the movable valve core (5), and the width of the groove is greater than the thickness of the support plate. 6. A low-noise electromagnetic valve for ventilators with high control precision and high sensitivity according to claim 5, characterized in that: initially, the inner ring surface of the support plate is against the lower wall surface of the groove, and the current is energized Finally, the movable spool (5) moves downward to compress the shrapnel to deform the shrapnel until the inner ring surface of the support plate is against the upper wall surface of the groove. 7. A low-noise solenoid valve for a ventilator with high control precision and high sensitivity according to claim 4, characterized in that: the planar elastic piece (7) includes three elastic pieces. 8. A low-noise solenoid valve for a ventilator with high control precision and high sensitivity according to claim 1, characterized in that: the nozzle (8) includes a coaxially arranged hollow small cylinder and a hollow large cylinder. Cylinder, the hollow large cylinder is fixed on the hollow small cylinder, the bottom end of the hollow small cylinder is arranged inside the hollow large cylinder, and the central air inlet channel is formed inside the hollow small cylinder, and the annular disk surface of the hollow large cylinder A number of through air outlet passages are evenly provided. 9. A low-noise electromagnetic valve for ventilators with high control precision and high sensitivity according to claim 1, characterized in that: initially, the moving valve core (5) is under the action of the planar shrapnel (7), The upper end of the moving spool (5) is against the bottom end of the central intake passage of the nozzle. 10. A ventilator, characterized in that it comprises the solenoid valve (1) according to any one of claims 1-9.

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