Solenoid valve and dry powder inhaler auxiliary inhalation device comprising same

Abstract

The invention discloses an electromagnetic valve and a dry powder inhaler auxiliary inhalation device comprising the electromagnetic valve. The electromagnetic valve comprises a valve shell, a valve element, a spring and an electromagnet, wherein the valve element, the spring and the electromagnet are arranged in the valve shell. The spring is arranged between the valve core and the electromagnet; and the valve shell is a cavity with an open upper end and a closed lower end or is provided with a blocking structure for blocking the iron core. The electromagnetic valve provided by the invention is simple in structure and small in size, and can realize the functions of sealing when the electromagnetic valve is not electrified, opening when the electromagnetic valve is electrified and opening when the air inlet needle is inflated. The invention further provides a dry powder inhaler auxiliary inhalation device with the electromagnetic valve, airflow is supplemented for the dry powder inhaler, medicine inhalation is assisted, the range of users of the dry powder inhaler is widened, and the dry powder inhaler can also be used by people suffering from bronchial diseases, children and the old.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a solenoid valve and a dry powder inhaler auxiliary inhalation device containing the solenoid valve. Background Art

[0002] A dry powder inhaler (DPI) is one of the most commonly used pulmonary inhalation drug delivery devices on the market today. The dry powder inhaler contains solid micronized drugs or a mixture of micronized drugs and carriers. Under the action of the patient's breathing airflow or the auxiliary power source inside the device, the micronized drug particles are atomized by airflow shear, collision, and drag to break away from the carrier and enter the targeted part of the lungs with the airflow.

[0003] The prior patent CN118662736B discloses a low-residue inhalation drug delivery device with an intake needle at the bottom to achieve ventilation during inhalation. However, this structural design has a relatively high inhalation resistance. Generally, the airflow required for inhalation by a dry powder inhaler is about 30 - 60 liters per minute. Some patients with bronchial diseases, children, and the elderly cannot generate such an inhalation airflow required, thus limiting the use of this device in this population.

[0004] A solenoid valve is a commonly used fluid control actuator, and the electromagnet is its core structure. A typical direct-acting normally closed solenoid valve consists of a coil assembly, an armature, a valve seat, a spring, etc. When the coil is energized, a magnetic field is generated inside the solenoid valve, and the armature moves under the action of the electromagnetic force; after power-off, the electromagnetic force disappears, and the armature is reset under the action of the spring force, thereby realizing the control of the on-off state. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a solenoid valve and a dry powder inhaler auxiliary inhalation device containing the solenoid valve. It realizes flexible control of inflation and deflation and provides auxiliary airflow for the use of the dry powder inhaler.

[0006] As the first aspect of the present invention, it lies in providing a solenoid valve, which includes a valve housing and a valve core, a spring, and an electromagnet disposed inside the valve housing. The spring is disposed between the valve core and the electromagnet; the valve housing is a cavity open at the upper end, and the space above the valve core inside the valve housing is an air passage for intake and exhaust.

[0007] The valve core includes a base in the shape of a frustum of a cone and a convex portion fixedly connected above the base; on the inner wall of the valve housing, there is an inclined surface that cooperates with the side surface of the base and whose inner diameter shrinks from bottom to top, so that the inclined surface can fit with the base, and the inclined surface and the side surface of the base are in surface contact to improve the sealing performance.

[0008] On the side wall of the valve housing below the inclined surface, several ventilation holes are provided.

[0009] A first sealing ring is arranged inside the side wall at the top of the valve housing, and a second sealing ring is arranged outside the side wall. Both are made of elastic material. In the embodiment of the present invention, the elastic material can be materials such as silica gel and rubber.

[0010] Preferably, the convex part of the valve core in the solenoid valve is one piece, or includes a base and two convex blocks fixedly connected above the base. The two convex blocks are arranged at the edge of the top of the base.

[0011] As the second aspect of the present invention, it lies in providing a dry powder inhaler auxiliary inhalation device including the solenoid valve.

[0012] Preferably, the dry powder inhaler auxiliary inhalation device includes an air supplement box and a telescopic airbag located in the air supplement box. One end of the telescopic airbag facing the solenoid valve is open, and the other end is closed. The top end of the valve housing of the solenoid valve extends out from the top of the air supplement box and the top of the telescopic airbag. The ventilation hole is located below the top cover of the air supplement box and inside the cavity of the telescopic airbag. The top of the telescopic airbag is fixed to the inner wall of the top of the air supplement box.

[0013] Furthermore, the second sealing ring of the valve housing of the solenoid valve extends out from the top of the air supplement box and the telescopic airbag for sealing connection.

[0014] The bottom of the telescopic airbag is fixedly connected to the inner wall of the bottom of the air supplement box through a compression spring. Before the telescopic airbag is inflated, the compression spring is in a stretched state.

[0015] The air supplement box includes an airbag bin with a cavity for accommodating the telescopic airbag, and a power supply bin for accommodating the battery. The power supply bin is provided with a switch to control the on-off of the power supply of the solenoid valve, and the battery supplies power to the solenoid valve. The switch of the power supply bin is energized when pressed and disconnects automatically when no longer pressed.

[0016] The airbag bin of the air supplement box for accommodating the telescopic airbag is provided with a transparent observation window and a pressure indication scale. A pressure indication line is arranged on the telescopic airbag for observing the internal situation of the cavity of the air supplement box and indicating the pressure.

[0017] Preferably, the cross-section of the telescopic airbag is circular or square.

[0018] An exhaust hole is arranged at the bottom of the air supplement box.

[0019] As the third aspect of the present invention, it lies in providing a usage method of the dry powder inhaler auxiliary inhalation device. Based on the dry powder inhaler auxiliary inhalation device described above, it includes the following steps:

[0020] Step 1, insert the intake needle connected to the air source into the valve housing of the solenoid valve at the airway position. The intake needle compresses the lower spring through the valve core along the airway to inflate the telescopic airbag. When the target pressure is reached and the pressure indication line points to the target pressure indication scale, the inflation is completed, and then pull out the intake needle;

[0021] Step 2: After the dry powder inhaler cuts the capsule, the auxiliary inhalation device of the dry powder inhaler is connected to the lower part of the fixed cavity of the capsule chamber of the dry powder inhaler through the valve housing.

[0022] Step 3: The user inhales through the mouthpiece of the dry powder inhaler. At the same time, the switch on the air supplement box is turned on. Under the action of the electromagnet, the valve core moves downward. The gas in the telescopic airbag is sent into the dry powder inhaler through the solenoid valve under the extrusion of its own relatively large air pressure and the compression spring, achieving the air supplement effect.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The present invention provides a solenoid valve with a simple structure and a small volume, which can achieve sealing when not powered on and opening when powered on, effectively and flexibly controlling the air flow inflation and deflation.

[0025] 2. The present invention provides an inhalation assistance device with the solenoid valve, which supplements air flow for the dry powder inhaler and assists in drug inhalation, expanding the range of users of the dry powder inhaler. People with bronchial diseases, children and the elderly can also use it.

[0026] 3. In the inhalation assistance device with the solenoid valve provided by the present invention, the pre-charged gas is stored in the telescopic airbag. When in need of use, the solenoid valve is powered on. At this time, the valve opens, and the compressed gas in the airbag enters the connected dry powder inhaler through the solenoid valve under the pressure of the compression spring, realizing the air supplement function.

[0027] 4. The inhalation assistance device with the solenoid valve provided by the present invention is small in volume and convenient to carry.

[0028] 5. The inhalation assistance device with the solenoid valve provided by the present invention is electrically opened and has a rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0030] Figure 1 Schematic diagram of the overall structure of the solenoid valve provided in Embodiment 1 of the present invention;

[0031] Figure 2 Schematic diagram of the inflation state of the solenoid valve provided in Embodiment 1 of the present invention;

[0032] Figure 3 Schematic diagram of the valve core structure in the solenoid valve provided in Embodiment 1 of the present invention; wherein, a is a kind of valve core structure, and b is a valve core structure with a sealing layer;

[0033] Figure 4 Schematic diagram of the spool structure in the solenoid valve provided in Embodiment 2 of the present invention; wherein, a is the spool with two bump structures, and b is the spool with one protruding portion;

[0034] Figure 5 Schematic diagram of the overall structure of the auxiliary inhalation device of the dry powder inhaler provided in Embodiment 3 of the present invention;

[0035] Figure 6 Schematic diagram of the telescopic airbag structure after inflation in the auxiliary inhalation device of the dry powder inhaler provided in Embodiment 3 of the present invention;

[0036] Figure 7 Schematic diagram of the telescopic airbag structure in the auxiliary inhalation device of the dry powder inhaler provided in Embodiment 3 of the present invention; wherein, a is the telescopic airbag with a circular cross-section, and b is the telescopic airbag with a square cross-section.

[0037] Figure 8 Schematic diagram of the auxiliary inhalation device of the dry powder inhaler provided in Embodiment 3 of the present invention from a bottom view angle.

[0038] Figure 9 Schematic diagram of the assembly of the auxiliary inhalation device of the dry powder inhaler and the dry powder inhaler provided in Embodiment 3 of the present invention.

[0039] Wherein, 101 - valve housing, 102 - spool, 103 - spring, 104 - electromagnet;

[0040] 1011 - inclined surface, 1012 - ventilation hole, 1013 - first sealing ring, 1014 - second sealing ring;

[0041] 1021 - base, 1022 - protruding portion, 1023 - bump, 1024 - sealing layer;

[0042] 1041 - iron core, 1042 - electromagnetic coil;

[0043] 201 - air supplement box, 202 - telescopic airbag, 203 - airbag bin, 204 - compression spring, 205 - fixing plate, 206 - switch, 207 - transparent observation window, 208 - pressure indication scale, 209 - exhaust hole, 210 - power supply bin, 211 - pressure indication line;

[0044] 2011 - air supplement box top cover, 2021 - telescopic airbag outer frame.

[0045] 301 - intake needle, 302 - air passage;

[0046] 41 - base body, 42 - capsule bin; 4102 - capsule bin fixed cavity; 4203 - adjustable bottom groove, 4207 - intake rod. Detailed implementation manners

[0047] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] The prior patent CN118662736B discloses a low-residue inhalation device with an intake needle at the bottom to achieve ventilation during inhalation. To overcome the problems of the need for a large suction force and limited patient range of this structure, the present invention provides a solenoid valve and a dry powder inhaler auxiliary inhalation device with a solenoid valve.

[0050] Example 1, a solenoid valve

[0051] As Figure 1 and Figure 2 shown, it includes a valve housing 101 and a valve core 102, a spring 103, and an electromagnet 104 disposed inside the valve housing 101. The electromagnet 104 includes an iron core 1041 and an electromagnetic coil 1042 on its outer periphery; the spring 103 is disposed between the valve core 102 and the electromagnet 104; the valve housing 101 is a cavity open at the upper end and closed at the lower end or provided with a blocking structure for blocking the iron core 1041. The space above the valve core 102 inside the valve housing 101 is an air inlet and outlet airway 302. The valve core 102 is made of iron, nickel, cobalt, manganese, or a magnetic metal material.

[0052] The structure of the valve core 102 is as Figure 3 shown. As Figure 3 shown in a of, it includes a frustum-shaped base 1021, a convex portion 1022 fixedly connected above the base 1021, and an inclined surface 1011 with an inner diameter that contracts from bottom to top is provided on the inner wall of the valve housing 101 and is matched with the frustum structure of the base 1021. The inclined surface 1011 has the same angle as the frustum of the base, and the inclined surface 1011 is in surface contact with the frustum of the base 1021 to improve the sealing performance.

[0053] The convex portion 1022 and the base 1021 are integrally formed or fixedly connected.

[0054] As a further modification of the structure, as Figure 3As shown in Figure b, a sealing layer 1024 is provided on the outside of the base 1021 of the valve core 102. The sealing layer 1024 is made of an elastic material such as silica gel or rubber and can be fixed to the base 1021 by bonding or other means to further improve the sealing effect.

[0055] On the valve housing 101, a plurality of vent holes 1012 are provided on the side wall below the inclined surface 1011.

[0056] A first sealing ring 1013 is provided inside the side wall of the top of the valve housing 101, and a second sealing ring 1014 is provided outside the side wall. Both are made of an elastic material. In the embodiment of the present invention, the elastic material can be materials such as silica gel or rubber.

[0057] The valve housing 101 is made of a hard material, which can be a hard plastic or a metal material.

[0058] Embodiment 2

[0059] As a modification of the structure of Embodiment 1, the structure of the valve core 102 in the solenoid valve is as Figure 4 shown.

[0060] As an implementation method, as Figure 4 shown in Figure a, it includes a base 1021 and two convex blocks 1023 fixedly connected above the base 1021. The two convex blocks 1023 are symmetrically arranged at the edge of the top of the base 1021. During use, the bottom ends of the two convex blocks 1023 contact the intake needle 301, and the gap between the two convex blocks 1023 and the intake needle 301 forms a gas passage.

[0061] As another implementation method, as Figure 4 shown in Figure b, it includes a base 1021 and a raised portion 1022 fixedly connected above the base 1021. In this embodiment, the raised portion 1022 is a cuboid. During use, the intake needle 301 partially contacts the cuboid-shaped raised portion 1022, and gas passages are formed on both sides of the raised portion 1022.

[0062] Embodiment 3, a dry powder inhaler auxiliary inhalation device including the solenoid valve described in Embodiment 1

[0063] As Figure 5 and Figure 7 shown, it includes a gas supplement box 201 and a telescopic airbag 202 located in the gas supplement box 202. The telescopic airbag 202 is made of an elastic material, with one end facing the solenoid valve open and the other end closed. The top end of the solenoid valve housing 101 provided in Embodiment 1 extends out from the top of the gas supplement box 201, and the vent holes 1012 are located inside the cavity of the telescopic airbag 202.

[0064] The air supplement box 201 includes an airbag bin 203 with a cavity for accommodating the telescopic airbag 202, and a power supply bin 210 for accommodating a battery. A switch 206 is provided in the power supply bin 210 to control the opening and closing of the power supply. The battery powers the solenoid valve. When the switch 206 of the power supply bin is pressed, it is energized, and when it is no longer pressed, it disconnects automatically. When energized, the valve core 102 descends, and the gas in the telescopic airbag 202 enters the dry powder inhaler connected thereto through the vent hole 1012 via the solenoid valve to achieve the air supplement effect.

[0065] The air supplement box 201 includes a box body and an air supplement box top cover 2011 located at the top of the box body. The air supplement box top cover 2011 can be integrally formed with the air supplement box or can be plate-shaped and installed separately. In one embodiment, the air supplement box top cover 2011 can be at the top position of the airbag bin 203. In another embodiment, the air supplement box top cover 2011 can cover the top positions of the airbag bin 203 and the power supply bin 210.

[0066] The telescopic airbag outer frame 2021 at the top of the telescopic airbag 202 is fixed to the four sides of the inner wall of the air supplement box top cover 2011 by bonding or screws, and the periphery of the telescopic airbag outer frame 2021 is sealed.

[0067] As Figure 6 shown, the bottom of the telescopic airbag 202 is fixedly connected to the inner wall of the bottom of the air supplement box 201 through a compression spring 204 and a fixing plate 205. In another embodiment, the bottom of the telescopic airbag 204 is directly fixedly connected to the inner wall of the bottom of the air supplement box through a compression spring. Before the telescopic airbag is inflated, the compression spring 204 is in an extended state.

[0068] The part of the air supplement box 201 that accommodates the telescopic airbag 202 is provided with a transparent observation window 207 and a pressure indication scale 208 for observing the internal situation of the cavity of the air supplement box 201 and indicating the pressure.

[0069] A pressure indication line 211 is provided on the bladder of the telescopic airbag 202. As Figure 5 shown, in this embodiment, it is a red pressure indication line 211. By checking the position of the red pressure indication line 211 through the transparent observation window 207, the inflation situation of the airbag can be generally understood. Further, during assembly, a pressure detection device is used to detect the pressure values in the telescopic airbag at different positions of the red pressure indication line 211 and mark them at the pressure indication scale 208, so that the pressure situation in the telescopic airbag 202 can be understood during use. According to the needs of the user, the pressure of the compressed air in the airbag can be conveniently adjusted by inflating or deflating, so as to supplement airflows of different sizes.

[0070] As Figure 7As shown, the cross-section of the telescopic airbag 202 can be circular or square. When the cross-section is square, the cross-section is slightly smaller than the inner size of the air replenishing box, so that it can freely expand and contract, reducing or avoiding friction with the wall of the air replenishing box during inflation and deflation. Due to the limitation of the air replenishing box, when the cross-section is square, more compressed air can be accommodated.

[0071] After the airbag is inflated, it can only expand and contract vertically in a square shape, and cannot expand horizontally in a square shape. Therefore, there will be no friction with the wall of the air replenishing box after inflation.

[0072] As Figure 8 shown, an exhaust hole 209 can be provided at the bottom of the airbag chamber of the air replenishing box 201 to keep the inside of the air replenishing box in communication with the atmosphere and avoid interference with the pressure in the air replenishing box when the telescopic airbag expands and contracts.

[0073] This structure is used to adapt to the "low-residue inhalation administration device" provided by Patent CN118662736B. As Figure 9 shown, the base of the device includes a base body 41 and a capsule chamber fixing cavity 4102, a capsule chamber 42, etc. provided on the base body. The capsule chamber 42 further includes a capsule chamber body 4202 and an adjustable bottom groove 4203. An intake needle is provided at the bottom of the adjustable bottom groove 4203. The intake needle includes an air outlet part at the upper part and an intake rod 4207 connected below the air outlet part. It can be understood that the inner diameter or outer diameter of the valve housing of the solenoid valve provided by the present invention needs to be adapted to the lower part of the intake needle for inflation or the capsule chamber fixing cavity 4102 of the dry powder inhaler (low-residue inhalation administration device). Therefore, when inflating, the intake needle can be sleeved inside the air passage of the solenoid valve to achieve a sealed connection through the first sealing ring. When in use, as Figure 9 shown, the valve housing 101 can be sleeved inside the lower part of the capsule chamber fixing cavity 4102 of the dry powder inhaler to achieve a sealed connection through the second sealing ring 1014.

[0074] The working principle is explained as follows:

[0075] 1. As Figure 2 shown, first insert the intake needle 301 of the air pump into the valve housing 101 of the solenoid valve. The operator pushes the intake needle 301 to compress the lower spring 103 through the valve core 102, and then inflates the telescopic airbag 202. The gas is filled into the telescopic airbag through the ventilation hole 1012. As Figure 6 shown, the telescopic airbag expands downward, discharging the excess air in the air replenishing box through the exhaust hole at the bottom. After reaching the target pressure (the pressure indicator line points to the target pressure indication scale), the intake needle is withdrawn. The valve core moves upward under the action of the spring, blocking the air passage 302. At this time, the telescopic airbag 202 is in an extended state, and the compression spring 204 is in a compressed state.

[0076] 2. Place the capsule into the dry powder inhaler according to the method described in paragraph

[63] of Patent CN118662736B and complete the cutting. Note not to inhale through the mouthpiece at this time.

[0077] 3. The outer diameter of the ventilation valve is slightly smaller than the inner diameter of the capsule chamber fixing cavity 4102 at the bottom of the dry powder inhaler. A second sealing ring 1014 is provided on the outer side of the ventilation valve, and the outer diameter of the second sealing ring 1014 is slightly larger than the inner diameter of the capsule chamber fixing cavity 4102. After aligning the lower part of the capsule chamber fixing cavity 4102 of the dry powder inhaler with the ventilation valve, press down the dry powder inhaler, and the second sealing ring provided on the ventilation valve makes the two seal and connect.

[0078] 4. When the user inhales through the mouthpiece or slightly later, press the air supplement box switch 206. The circuit is connected, and the valve core 102 moves downward under the action of the electromagnet, opening the air passage 302. The compression spring 204 compresses the telescopic airbag 202 so that the compressed air in the telescopic airbag passes through the solenoid valve and through the intake rod to form the required air flow, thereby assisting the user to complete the inhalation of the dry powder drug and achieving the air supplement effect.

[0079] 5. After use, turn off the switch 206 on the air supplement box and separate the dry powder inhaler from the dry powder inhaler auxiliary inhalation device of the present invention; before the next use, if necessary, the dry powder inhaler auxiliary inhalation device can be inflated again according to step 1.

[0080] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solenoid valve, comprising a valve housing and a valve core, a spring and an electromagnet arranged inside the valve housing; the spring is arranged between the valve core and the electromagnet; characterized in that, The valve housing is a cavity open at the upper end. The space inside the valve housing and above the valve core is the air passage for air intake and outlet. The valve core includes a frustum-shaped base and a convex portion fixedly connected above the base. An inclined surface that cooperates with the side surface of the base and whose inner diameter shrinks from bottom to top is provided on the inner wall of the valve housing. A number of ventilation holes are provided on the side wall of the valve housing below the inclined surface.

2. The solenoid valve according to claim 1, characterized in that, A first sealing ring is provided inside the side wall at the top of the valve housing, and a second sealing ring is provided outside the side wall.

3. The solenoid valve according to claim 1, characterized in that, The convex portion is one piece, or two convex blocks fixedly connected above the base, and the two convex blocks are arranged at the edge of the top of the base.

4. Dry powder inhaler-assisted inhalation device, characterized in that, It includes the solenoid valve according to any one of claims 2 to 3.

5. The dry powder inhaler-assisted inhalation device according to claim 4, wherein It includes a gas supplement box and a telescopic airbag located in the gas supplement box. One end of the telescopic airbag facing the solenoid valve is open, and the other end is closed. The top end of the second sealing ring of the solenoid valve housing protrudes from the top of the gas supplement box and the telescopic airbag. The ventilation holes are located below the top cover of the gas supplement box and inside the cavity of the telescopic airbag. The top of the telescopic airbag is fixed to the inner wall of the top of the gas supplement box.

6. The dry powder inhaler auxiliary inhalation device according to claim 5, wherein, The bottom of the telescopic airbag is fixedly connected to the inner wall of the bottom of the gas supplement box through a compression spring. Before the telescopic airbag is inflated, the compression spring is in a stretched state.

7. The dry powder inhaler assisted inhalation device according to claim 5, characterized in that, The gas supplement box includes an airbag bin with a cavity for accommodating the telescopic airbag and a power supply bin for accommodating the battery. A switch is provided in the power supply bin to control the opening and closing of the power supply, and the battery supplies power to the solenoid valve.

8. The dry powder inhaler-assisted inhalation device according to claim 5, wherein, The airbag bin of the gas supplement box for accommodating the telescopic airbag is provided with a transparent observation window and a pressure indication scale, and a pressure indication line is provided on the telescopic airbag.

9. The dry powder inhaler auxiliary inhalation device according to claim 5, characterized in that, The cross-section of the telescopic airbag is circular or square.

10. Method for using a dry powder inhaler assisted inhalation device, characterized in that, Based on the dry powder inhaler auxiliary inhalation device according to claim 4, it includes the following steps: Step 1: Insert the intake needle connected to the gas source into the valve housing of the solenoid valve. The intake needle compresses the lower spring through the valve core to inflate the telescopic airbag. When the target pressure is reached, the pressure indication line points to the target pressure indication scale, and at this time, the intake needle is withdrawn. Step 2: After the dry powder inhaler cuts the capsule, the dry powder inhaler auxiliary inhalation device is fixedly connected to the lower part of the fixed cavity of the capsule bin of the dry powder inhaler through the valve housing. Step 3: The user inhales through the mouthpiece of the dry powder inhaler. At the same time, the switch on the gas supplement box is turned on, and the valve core moves downward under the action of the electromagnet. The gas in the telescopic airbag is sent into the dry powder inhaler through the solenoid valve under the extrusion of its own air pressure and the compression spring.

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