Dry powder sprayer

Abstract

The dry powder sprayer comprises a storage bottle, the storage bottle is connected with a spraying device, the storage bottle comprises an inner bottle body and an outer bottle body, the inner bottle body is arranged in the outer bottle body, a middle section is arranged between the outer side of a bottle opening of the inner bottle body and the inner side of a bottle opening of the outer bottle body, the inner bottle body is movably connected with the middle section, and the middle section is detachably connected with the outer bottle body. A sealing piston is arranged at the bottom of the inner bottle, a compressed air chamber is arranged between the sealing piston and the inner side of the bottom of the outer bottle, the outer side of the sealing piston is tightly attached to the inner side wall of a bottle body of the outer bottle, and an upper one-way valve allowing air to flow from the compressed air chamber to an inner cavity of the inner bottle in a one-way mode is arranged on the sealing piston. And a lower one-way valve allowing air to enter the compressed air chamber from the outside is arranged at the bottom of the outer bottle. The structure of parts is simplified, and production and installation are convenient; compressed air enters the inner bottle from the bottom, the dry powder stored in the inner bottle is stirred and blown away, and the dry powder can be prevented from being hardened in the inner bottle.

Description

Technical Field

[0001] The present invention relates to the technical field of sprayers, in particular to a dry powder sprayer. Background Art

[0002] The working principle of the sprayer is to generate pressure internally or introduce external pressure into the sprayer, thereby increasing the internal pressure of the sprayer to spray substances in different forms from the sprayer, including gas, liquid, dry powder sprayer, etc.

[0003] The Chinese patent publication "A Disposable Ear Powder Sprayer" with the announcement number CN 209997007 U discloses a pump bottle, wherein the opening of the pump bottle is threadedly connected with a sealing cap, the bottom of the inner wall of the sealing cap is fixedly connected with a pump body, the inner wall of the pump body is movably connected with a pressing head, the top of the pressing head passes through the sealing cap and extends to the outside of the sealing cap, the inner wall of the pump body is fixedly connected with a limiting ring, the pressing head is slidably connected with the limiting ring, the surface of the pressing head is sleeved with a first spring located above the limiting ring, and the bottom of the inner wall of the pump body is provided with an extrusion cavity. After use, a new device is directly replaced, and one person uses one tube, which effectively controls cross infection. The pressing head, pump body, powder outlet, etc. of this patent are all located at the opening of the pump bottle. Due to the limited position of the bottle mouth, the connection structure of the pressing head, pump body, etc. is relatively complicated and is not suitable for all dry powder sprayers. Summary of the invention

[0004] The present invention provides a dry powder sprayer, in which a pressing head and a pump body are respectively arranged at the top and bottom of a storage bottle, thereby simplifying the structure of components and making production and installation more convenient.

[0005] This solution provides the following technical solutions:

[0006] A dry powder sprayer comprises a storage bottle, which is connected to a spray device. The storage bottle comprises an inner bottle and an outer bottle. The inner bottle is arranged in the outer bottle. A middle section is arranged between the outer side of the inner bottle mouth and the inner side of the outer bottle mouth. The inner bottle is movably connected to the middle section, and the middle section is detachably connected to the outer bottle. A sealing piston is arranged at the bottom of the inner bottle. A compressed air chamber is arranged between the sealing piston and the inner side of the bottom of the outer bottle. The outer side of the sealing piston is tightly attached to the inner side wall of the outer bottle body. An upper one-way valve that allows air to flow from the compressed air chamber to the inner cavity of the inner bottle is arranged on the sealing piston. A lower one-way valve that allows air to enter the compressed air chamber from the outside is arranged at the bottom of the outer bottle. The spray device comprises a pressing head, a straw, and a resetting device. The inner bottle mouth is connected to the pressing head. The pressing head is provided with an outlet channel. The straw is arranged in the inner bottle, and one end of the straw is connected to the outlet channel, and the other end extends to the sealing piston. The reset device includes a reset spring arranged in the compressed air chamber, one end of the reset spring is connected to the sealing piston, and the other end is connected to the inner side of the bottom of the outer bottle; when the pressing head is pressed downward, the inner bottle is driven to move downward, and the bottom of the inner bottle supports the sealing piston and moves downward together with the reset spring. The air in the compressed air chamber is squeezed and the pressure increases until the upper one-way valve is pushed open and enters the inner bottle. The dry powder stored in the inner bottle is pressed and enters the outlet channel of the pressing head and is sprayed out through the straw; after the pressing head is released, the reset spring drives the sealing piston and the inner bottle to move upward, the compressed air chamber expands and the air pressure decreases. When the outside air pressure is greater than the air pressure in the compressed air chamber, the lower one-way valve is pushed open and enters the compressed air chamber until the pressure is balanced.

[0007] In this solution, the pressing head is located at the mouth of the storage bottle, and the pump body (including the piston and the return spring) is located at the bottom of the storage bottle. After separation, the air inlet and the powder outlet are also respectively arranged at the two ends of the storage bottle, which will not interfere with each other. The structure of each component is also relatively simple and easy to manufacture and install. The inner bottle of this solution is used to store dry powder and transmit the pressure of the pressing head. The user can hold the outer bottle with one hand and press the pressing head with the thumb or the other hand. At this time, the outer bottle and the middle section do not move, and the pressing head presses the inner bottle down. After releasing, the inner bottle and the pressing head automatically rebound, and the dry powder can be continuously pressed out.

[0008] As a preferred solution of the present invention, the pressing head includes a pressing head, a head cap, a sealing cover, a gasket, and a screw ring. The outer side of the inner bottle mouth is provided with an external thread, the gasket is close to the inner bottle mouth, the screw ring is connected to the inner bottle mouth by a thread and presses the sealing cover onto the gasket, the bottom of the sealing cover is connected to the straw, the top of the sealing cover is connected to the head cap, the top of the head cap is connected to the middle of the pressing head, a hollow ring is provided on the outer side of the pressing head and the bottom of the ring is close to the inner bottle, an outlet channel is formed inside the pressing head, the head cap, and the sealing cover, one end of the outlet channel is connected to the straw, and the other end is connected to the outside.

[0009] As a preferred solution of the present invention, the muffler cover comprises a muffler cover body with a cross-section in the shape of a Chinese character “J”, a through hole is provided in the middle of the muffler cover body, the edge of the through hole extends downward to form an external plug-in tube cooperating with the straw, the edge of the through hole extends upward to form an internal plug-in tube cooperating with the head cap, the head cap is a tubular body closed at one end, the press head is sleeved on the outside of the head cap, the axis of the outlet channel is perpendicular to the axis of the muffler cover through hole, a nozzle is provided on the top side of the press head, and the outlet channel passes through the nozzle, the press head, the head cap, the internal plug-in tube and is connected to the through hole and the straw.

[0010] As a preferred solution of the present invention, an upper step and a lower step are connected to each other between the mouth of the inner bottle and the body of the inner bottle, an outer wall of the upper step is provided with an external thread, the spiral coil is connected to the external thread, the outer wall of the lower step is movably connected to the middle section, the bottom of the button ring is arranged between the middle section and the spiral coil, and the button ring is rotatably connected to the spiral coil. The bottom of the button head of this solution is limited by the spiral coil and cannot move up and down, but the button head can rotate. When the button head rotates, the dry powder can be sprayed out when the outlet channel on the button head is aligned with the outlet channel of the head cap. When they are not aligned, the dry powder cannot be sprayed out, which plays the role of opening and closing.

[0011] As a preferred solution of the present invention, one or more ventilation grooves sunken into the inner wall of the outer plug-in tube are provided on the inner wall of the outer plug-in tube, and the ventilation grooves connect the inner bottle with the inner plug-in tube. Dry powder is inevitably compacted during storage. Although the straw is provided with multiple suction holes so that large dry powder particles cannot pass through during spraying, small dry powder particles that are compacted can still pass through the suction holes. The ventilation grooves provided in this solution can guide a part of the high-pressure air injected into the inner bottle to be sprayed out together with the dry powder through the ventilation grooves. This part of the guided high-pressure air can accelerate the speed of the dry powder particles and make them collide with each other or with the inner wall of the inner plug-in tube, thereby breaking up the compacted dry powder particles so that the dry powder is basically in a powder state when sprayed.

[0012] The pressing head of this scheme must firstly seal the inner bottle well to prevent the air from leaking out and preventing the dry powder from being pressed out; secondly, it must form an outlet channel so that the dry powder can be sprayed out smoothly; and thirdly, it must simplify the structural parts to facilitate its production and installation. This scheme decomposes the pressing head into multiple components, which can meet these three requirements after assembly.

[0013] As a preferred solution of the present invention, the bottom of the outer bottle is provided with an embedding groove, a bottom cover, and a mounting groove. The mounting groove is located in the middle of the bottom of the outer bottle and is recessed into the inner part of the outer bottle. The connection between the reset spring and the inner side of the bottom of the outer bottle is located outside the mounting groove. A lower check valve is provided at the center of the mounting groove. The bottom cover is provided in the embedding groove. A plurality of air inlet holes are provided on the bottom cover. An air inlet duct connecting the air inlet holes and the lower check valve is provided at the bottom of the embedding groove. The lower check valve of this solution is shielded by the bottom cover to avoid direct exposure of the lower check valve, which can prevent foreign matter from entering and jamming the lower check valve. A plurality of air inlet holes are provided on the bottom cover, which cooperate with the corresponding air inlet duct to timely provide sufficient air to replenish the compressed air chamber.

[0014] As a preferred solution of the present invention, the middle part of the sealing piston is a funnel-shaped body, the bottom of the funnel-shaped body is a funnel tube, the middle part of the funnel tube is provided with an upper one-way valve, the connection between the return spring and the sealing piston is located outside the funnel tube, the top circumference of the funnel-shaped body is provided with an annular flip cover extending downward, the middle part of the flip cover is provided with a piston step, the upper part of the piston step is clamped with the inner wall of the inner bottle, and the lower part of the piston step is tightly sealed with the inner wall of the outer bottle. The sealing piston of this solution can prevent the gas in the compressed air chamber from overflowing from the gap between the outer bottle and the inner bottle, and the funnel-shaped body of the sealing piston can make the dry powder stored in the inner bottle flow to the funnel tube, avoiding the problem that the dry powder at the bottom of the common flat-bottomed bottle is difficult to be sprayed out; the upper one-way valve is arranged in the middle part of the sealing piston, and when the compressed air enters the inner bottle from the upper one-way valve, it has a stirring and blowing effect on the dry powder stored in the inner bottle, which can prevent the problem that the dry powder is hardened in the inner bottle and cannot flow, which is also the effect that cannot be achieved when the air inlet is located at the upper part and the air is blown downward.

[0015] As a preferred solution of the present invention, a straw sleeve is provided on the end of the pipe near the sealing piston, and the straw sleeve includes a sleeve tube and a conical plug tube. The sleeve tube is sleeved on the outside of the straw, and a powder chamber connected to the straw is provided in the conical plug tube, and a plurality of powder through holes are provided on the wall of the conical plug tube. This solution adopts a straw sleeve, which is sleeved on the pipe mouth of the straw, and a plurality of powder through holes are provided on the side of the straw sleeve plug tube. After a large amount of compressed air is pressed into the inner bottle, pressure is generated on the dry powder, so that the dry powder can be pressed into the straw with relatively low pressure and sprayed out from the outlet channel; the straw of this solution can also be divided into two sections, the upper part is a connecting section for connecting with the pressing head, and the lower part is an absorption section for absorbing dry powder, which can be distinguished and connected to each other according to different purposes.

[0016] As a preferred solution of the present invention, an outer cover is provided on the outer side of the pressing head, and the bottom of the outer cover is connected to the outer side of the middle section.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the pressing head and the pump body are respectively arranged at the top and bottom ends of the storage bottle, which simplifies the component structure and is more convenient for production and installation; the compressed air enters the inner bottle from the bottom, which stirs and disperses the dry powder stored in the inner bottle, thereby preventing the dry powder from being compacted in the inner bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the appearance of the present invention.

[0019] Figure 2 It is a schematic diagram of a cross-sectional structure of the present invention.

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the present invention from another angle.

[0021] Figure 4 It is a schematic structural diagram of the compressed air chamber exhausting and spraying dry powder according to the present invention.

[0022] Figure 5 It is a schematic structural diagram of the compressed air chamber intake after the dry powder is sprayed out of the present invention.

[0023] Figure 6 It is a schematic diagram of a cross-sectional structure of the inner bottle of the present invention.

[0024] Figure 7 It is a schematic diagram of a cross-sectional structure of the sealing piston of the present invention.

[0025] Figure 8 It is a schematic diagram of a cross-sectional structure of a pressing head of the present invention.

[0026] Fig. 9 It is a schematic diagram of a cross-sectional structure of the cover of the present invention.

[0027] Fig.10 It is a schematic diagram of the external structure of the cover of the present invention.

[0028] In the figure: 1, storage bottle 2, spray device 3, inner bottle 4, outer bottle

[0029] 5. Middle section 6. Sealing piston 7. Compressed air chamber 8. Upper check valve

[0030] 9. Lower one-way valve 10. Straw cover 11. Outer cover 21. Pressing head

[0031] 22, straw 23, reset device 24, exit channel 31, upper step

[0032] 32, lower step 41, embedding groove 42, bottom cover 43, installation groove

[0033] 61. Funnel-shaped body 62. Funnel tube 63. Flip cover 64. Piston step

[0034] 211, button head 212, head cap 213, cover 214, gasket

[0035] 215, screw ring 216, ring 217, cover body 218, external plug-in tube

[0036] 219, internal plug-in tube 220, ventilation groove 241, nozzle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] See also Figure 1-Figure 10 , the present invention provides a technical solution:

[0042] A dry powder sprayer comprises a storage bottle 1, the storage bottle 1 is connected to a spray device 2, the storage bottle 1 comprises an inner bottle 3 and an outer bottle 4, the inner bottle 3 is arranged in the outer bottle 4, a middle section 5 is arranged between the outer side of the bottle mouth of the inner bottle 3 and the inner side of the bottle mouth of the outer bottle 4, the inner bottle 3 and the middle section 5 are movably connected, the middle section 5 and the outer bottle 4 are detachably connected, a sealing piston 6 is arranged at the bottom of the inner bottle 3, a compressed air chamber 7 is arranged between the sealing piston 6 and the inner side of the bottom of the outer bottle 4, the outer side of the sealing piston 6 is closely attached to the inner side wall of the bottle body of the outer bottle 4, and a one-way air-permitting ... The outer bottle 4 is provided with an upper one-way valve 8 for allowing air to flow into the compressed air chamber 7 in one direction, and the bottom of the outer bottle 4 is provided with a lower one-way valve 9 for allowing air to enter the compressed air chamber 7 from the outside in one direction; the spray device 2 includes a pressing head 21, a straw 22, and a reset device 23. The bottle mouth of the inner bottle 3 is connected to the pressing head 21, and the pressing head 21 is provided with an outlet channel 24. The straw 22 is arranged in the inner bottle 3 and one end is connected to the outlet channel 24, and the other end extends to the sealing piston 6. The reset device 23 includes a reset spring arranged in the compressed air chamber 7, one end of the reset spring is connected to the sealing piston 6, and the other end is connected to the inner side of the bottom of the outer bottle 4.

[0043] The pressing head 21 includes a pressing head 211, a head cap 212, a sealing cover 213, a gasket 214, and a screw ring 215. An external thread is provided on the outer side of the bottle mouth of the inner bottle 3. The gasket 214 is close to the bottle mouth of the inner bottle 3. The screw ring 215 is connected to the bottle mouth of the inner bottle 3 through a thread and presses the sealing cover 213 onto the gasket 214. The bottom of the sealing cover 213 is connected to the straw 22, the top of the sealing cover 213 is connected to the head cap 212, and the top of the head cap 212 is connected to the middle of the pressing head 211. A hollow ring 216 is provided on the outer side of the pressing head 211 and the bottom of the ring 216 is close to the inner bottle 3. An outlet channel 24 is formed inside the pressing head 211, the head cap 212, and the sealing cover 213. One end of the outlet channel 24 is connected to the straw 22, and the other end is connected to the outside.

[0044] The sealing cover 213 includes a sealing cover body 217 with a cross-section in the shape of a Chinese character "J". A through hole is provided in the middle of the sealing cover body 217. The edge of the through hole extends downward to form an external plug-in tube 218 that cooperates with the straw 22, and the edge of the through hole extends upward to form an internal plug-in tube 219 that cooperates with the head cap 212. The head cap 212 is a tubular body with one end closed. The pressing head 211 is sleeved on the outside of the head cap 212. The axis of the outlet channel 24 is perpendicular to the axis of the through hole of the sealing cover 213. A nozzle 241 is provided on the top side of the pressing head 211. The outlet channel 24 passes through the nozzle 241, the pressing head 211, the head cap 212, and the internal plug-in tube 219 to communicate with the through hole and the straw 22.

[0045] An upper step 31 and a lower step 32 are connected to each other between the bottle mouth of the inner bottle 3 and the bottle body of the inner bottle 3. An external thread is provided on the outer wall of the upper step 31, and the spiral coil 215 is connected to the external thread. The outer wall of the lower step 32 is movably connected to the middle section 5. The bottom of the ring 216 of the pressing head 211 is arranged between the middle section 5 and the spiral coil 215, and the ring 216 of the pressing head 211 is rotatably connected to the spiral coil 215.

[0046] One or more ventilation grooves 220 recessed into the inner wall of the outer plug-in tube 218 are provided on the inner wall thereof, and the ventilation grooves 220 communicate the interior of the inner bottle 3 with the inner plug-in tube 219 .

[0047] The bottom of the outer bottle 4 is provided with an embedding groove 41, a bottom cover 42, and a mounting groove 43. The mounting groove 43 is located in the middle of the bottom of the outer bottle 4 and is recessed toward the inside of the outer bottle 4. The connection between the return spring and the inner side of the bottom of the outer bottle 4 is located outside the mounting groove 43. A lower one-way valve 9 is provided at the center of the mounting groove 43. The bottom cover 42 is arranged in the embedding groove 41. A plurality of air inlet holes are provided on the bottom cover 42. An air inlet passage connecting the air inlet holes and the lower one-way valve 9 is provided at the bottom of the embedding groove 41.

[0048] The middle part of the sealing piston 6 is a funnel-shaped body 61, the bottom of the funnel-shaped body 61 is a funnel tube 62, the middle part of the funnel tube 62 is provided with an upper one-way valve 8, the connection between the return spring and the sealing piston 6 is located on the outside of the funnel tube 62, the top circular periphery of the funnel-shaped body 61 is provided with an annular flip cover 63 extending downward, the middle part of the flip cover 63 is provided with a piston step 64, the upper part of the piston step 64 is clamped with the inner wall of the inner bottle 3, and the lower part of the piston step 63 is tightly sealed with the inner wall of the outer bottle 4.

[0049] A straw sleeve 10 is provided on the pipe opening at one end of the straw 22 close to the sealing piston 6. The straw sleeve 10 includes a sleeve tube and a conical plug tube. The sleeve tube is sleeved on the outside of the straw 22. A powder chamber connected to the straw 22 is provided in the conical plug tube. A plurality of powder through holes are provided on the wall of the conical plug tube.

[0050] An outer cover 11 is disposed outside the pressing head 21 , and a bottom of the outer cover 11 is connected to the outer side of the middle section 5 .

[0051] The specific implementation process is that the inner bottle 3 of the present scheme is used to store dry powder and transmit the pressure of the pressing head 21. The user can hold the outer bottle 4 with one hand and press the pressing head 21 with the thumb or the other hand. At this time, the outer bottle 4 and the middle section 5 are stationary, and the pressing head 21 drives the inner bottle 3 and the sealing piston 6 to be pressed down together. After releasing, the inner bottle 3 and the pressing head 21 automatically rebound under the action of the reset spring. Continuously pressing the pressing head 21 can continuously spray out dry powder.

[0052] When the pressing head 21 is pressed down, it drives the inner bottle 3 to move downward, and the bottom of the inner bottle 3 presses the sealing piston 6 and the return spring to move downward together, the compressed air chamber 7 shrinks, and the air inside it is squeezed and the pressure increases until it pushes open the upper one-way valve 8 and enters the inner bottle 2. The dry powder stored in the inner bottle 2 is pressurized and enters the outlet channel 24 of the pressing head 21 through the straw 22 and is sprayed out; after the pressing head 21 is released, the return spring drives the sealing piston 6 and the inner bottle 3 to move upward, the volume of the compressed air chamber 7 expands and the air pressure decreases. When the outside air pressure is greater than the air pressure in the compressed air chamber 7, the lower one-way valve 9 is pushed open and enters the compressed air chamber 7 until the pressure is balanced.

[0053] The ventilation groove 220 guides a part of the high-pressure air injected into the inner bottle 3 into the inner plug-in tube 219 and enters the outlet channel 24. This part of the guided high-pressure air can accelerate the speed of the dry powder particles and make them collide with each other in the outlet channel 24 or collide with the inner wall of the inner plug-in tube 219, thereby breaking up the compacted dry powder particles and making the dry powder basically in a powder state when sprayed out.

[0054] The upper one-way valve 8 is arranged in the middle of the sealing piston 6. When the compressed air enters the inner bottle 3 from the upper one-way valve 8, it has a stirring and blowing effect on the dry powder stored in the inner bottle 3, which can prevent the dry powder from being hardened in the inner bottle 3 and unable to flow. This is also the effect that cannot be achieved when the air inlet is located at the upper part and the air is blown downward.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry powder sprayer, comprising a storage bottle connected to a spray device, characterized in that: The storage bottle comprises an inner bottle and an outer bottle, wherein the inner bottle is arranged in the outer bottle, a middle section is arranged between the outer side of the inner bottle mouth and the inner side of the outer bottle mouth, the inner bottle is movably connected to the middle section, and the middle section is detachably connected to the outer bottle, a sealing piston is arranged at the bottom of the inner bottle, a compressed air chamber is arranged between the sealing piston and the inner side of the bottom of the outer bottle, the outer side of the sealing piston is closely attached to the inner side wall of the outer bottle body, an upper one-way valve is arranged on the sealing piston for allowing air to flow from the compressed air chamber to the inner cavity of the inner bottle in one direction, and a lower one-way valve is arranged at the bottom of the outer bottle for allowing air to enter the compressed air chamber from the outside in one direction; The spray device comprises a pressing head, a straw, and a reset device. The mouth of the inner bottle is connected to the pressing head, and the pressing head is provided with an outlet channel. The straw is arranged in the inner bottle, one end of which is connected to the outlet channel, and the other end of which extends to the sealing piston. The reset device comprises a reset spring arranged in the compressed air chamber, one end of which is connected to the sealing piston, and the other end of which is connected to the inner side of the bottom of the outer bottle. When the pressing head is pressed down, it drives the inner bottle to move downward, and the bottom of the inner bottle pushes the sealing piston and the return spring to move downward together. The air in the compressed air chamber is squeezed and the pressure increases until the upper one-way valve is pushed open and enters the inner bottle. The dry powder stored in the inner bottle is pressed and sprayed into the outlet channel of the pressing head through the straw. After the pressing head is released, the return spring drives the sealing piston and the inner bottle to move upward, the compressed air chamber expands and the air pressure decreases. When the outside air pressure is greater than the air pressure in the compressed air chamber, the lower one-way valve is pushed open and enters the compressed air chamber until the pressure is balanced.

2. A dry powder sprayer according to claim 1, characterized in that: The pressing head includes a pressing head, a head cap, a sealing cover, a gasket, and a screw ring. The outer side of the inner bottle mouth is provided with an external thread, the gasket is close to the inner bottle mouth, the screw ring is connected to the inner bottle mouth through a thread and presses the sealing cover onto the gasket, the bottom of the sealing cover is connected to the straw, the top of the sealing cover is connected to the head cap, the top of the head cap is connected to the middle of the pressing head, a hollow ring is provided on the outer side of the pressing head and the bottom of the ring is close to the inner bottle, an outlet channel is formed inside the pressing head, the head cap, and the sealing cover, one end of the outlet channel is connected to the straw, and the other end is connected to the outside.

3. A dry powder sprayer according to claim 2, characterized in that: The described muffler cover comprises a muffler cover body with a cross-section in the shape of a Chinese character “J”, a through hole being provided in the middle of the described muffler cover body, the edge of the described through hole extending downward to form an external plug-in tube cooperating with a straw, the edge of the described through hole extending upward to form an internal plug-in tube cooperating with a head cap, the described head cap is a tubular body closed at one end, the described press head is sleeved on the outside of the head cap, the axis of the described outlet channel is perpendicular to the axis of the muffler cover through hole, the press head is provided on the side of the top of the press head, and the described outlet channel passes through the nozzle, the press head, the head cap, the internal plug-in tube and is connected with the through hole and the straw.

4. A dry powder sprayer according to claim 2, characterized in that: An upper step and a lower step connected to each other are arranged between the mouth of the inner bottle and the body of the inner bottle, an outer wall of the upper step is provided with an external thread, the spiral coil is connected to the external thread, the outer wall of the lower step is movably connected to the middle section, the bottom of the push-head ring is arranged between the middle section and the spiral coil, and the push-head ring is rotatably connected to the spiral coil.

5. A dry powder sprayer according to claim 3, characterized in that: One or more ventilation grooves sunken into the tube wall are arranged on the inner wall of the outer plug-in tube, and the ventilation grooves communicate the interior of the inner bottle with the inner plug-in tube.

6. A dry powder sprayer according to claim 1, characterized in that: The bottom of the outer bottle is provided with an embedding groove, a bottom cover, and a mounting groove. The mounting groove is located in the middle of the bottom of the outer bottle and is recessed toward the inside of the outer bottle. The connection between the reset spring and the inner side of the bottom of the outer bottle is located outside the mounting groove. A lower one-way valve is provided at the center of the mounting groove. The bottom cover is arranged in the embedding groove. A plurality of air inlet holes are provided on the bottom cover. An air inlet passage connecting the air inlet holes and the lower one-way valve is provided at the bottom of the embedding groove.

7. A dry powder sprayer according to claim 1, characterized in that: The middle part of the sealing piston is a funnel-shaped body, the bottom of the funnel-shaped body is a funnel tube, an upper one-way valve is arranged in the middle of the funnel tube, the connection between the return spring and the sealing piston is located outside the funnel tube, a circular flip cover extending downward is arranged on the top periphery of the funnel-shaped body, a piston step is arranged in the middle of the flip cover, the upper part of the piston step is clamped with the inner wall of the inner bottle, and the lower part of the piston step is tightly sealed with the inner wall of the outer bottle.

8. A dry powder sprayer according to claim 1, characterized in that: A straw sleeve is provided on the pipe opening at one end of the straw close to the sealing piston. The straw sleeve comprises a sleeve pipe and a conical plugging pipe. The sleeve pipe is sleeved on the outside of the straw. A powder chamber connected to the straw is provided in the conical plugging pipe. A plurality of powder through holes are provided on the wall of the conical plugging pipe.

9. A dry powder sprayer according to claim 1, characterized in that: An outer cover is arranged on the outer side of the pressing head, and the bottom of the outer cover is connected with the outer side of the middle section.

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