Spray packaging anti-blocking method and device

Abstract

The invention discloses a spray package anti-blocking method, which comprises the following steps of: introducing a gas pumping function into a pump body assembly, respectively sucking liquid and gas by the pump body assembly, pressurizing the liquid, pumping the liquid to a spray assembly, spraying vaporific liquid, pressurizing the gas, and opening a gas conveying path to spray the gas when the liquid pumping process is about to be finished or finished. Residual liquid in the spraying assembly is blown out, so that the spraying assembly and a nozzle are kept in an empty state; the invention further discloses a spray packaging anti-blocking device. The spray packaging anti-blocking device comprises a spray assembly, a pump body assembly and an airflow control unit. The pump body assembly further comprises an air pumping unit. The airflow control unit comprises a position control valve; liquid can be prevented from remaining in the nozzle and a small channel of the spraying assembly, residues generated after liquid volatilization are prevented from blocking the nozzle, and the anti-blocking purpose is effectively achieved.

Description

Technical Field

[0001] The invention relates to the technical field of packaging, in particular to the technical field of spray packaging, and specifically to a spray packaging anti-clogging method and a device thereof. Background Art

[0002] The spray packaging method has many unique advantages such as non-contact, uniform distribution, quantitative, easy to take, etc. It has achieved rapid development in the packaging industry, and its application areas are becoming increasingly extensive, covering many industries such as daily chemical products, medicines, cosmetics, food and condiments, and has also won the favor of consumers.

[0003] At present, common spray packaging is to suck the liquid from the packaging container into the pump body, and then use the piston to pressurize it to flow to the spray head and spray it out from the spray piece. After completing a spray action, the spray component and the fluid channel are filled with liquid products. For some specific liquid products, there will be a lot of residue after the liquid evaporates. If the interval between two uses is long, after several repetitions, the residue after the liquid dries up will accumulate. The residue will block the extremely small nozzle on the spray piece, and some will even block the smaller channel in front of the nozzle, causing the spray device to fail and cannot continue to be used. Therefore, for these specific liquid products, the existing spray packaging has certain design defects, which makes it difficult for consumers to use these products conveniently.

[0004] Currently, there is a lack of an effective anti-clogging method or device for spray packaging, so that these specific liquid products that are prone to residue can also be packaged through spray packaging to help consumers get a better user experience. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a spray packaging anti-clogging method and device thereof to solve at least one of the above technical problems.

[0006] In order to achieve the above object, the present invention provides a method for preventing clogging of a spray package, comprising the following steps: Using the pump assembly to suck in liquid; The gas is sucked in by utilizing the pumping function provided in the pump body assembly; Pressurize the liquid to pump it out to the spray assembly and spray the liquid in mist form; Pressurizing the gas, when the liquid pumping process is about to be completed or has been completed, opening the gas delivery channel to spray gas, blowing out the residual liquid in the spray assembly, so that the spray assembly including the nozzle remains in an empty state; The method of the present invention mainly introduces a pumping function into the pump body assembly, uses the pump body assembly to suck in liquid and gas, pressurizes the liquid, pumps the liquid to the spray assembly and sprays out a mist of liquid, pressurizes the gas, and when the liquid pumping process is about to be completed or has been completed, opens the gas delivery channel to spray out the gas, blows out the residual liquid in the spray assembly, keeps the spray assembly including the nozzle in an empty state, avoids the residual matter after the residual liquid evaporates to block the liquid passage in the spray assembly, and can effectively achieve the purpose of anti-blockage.

[0007] The present invention also provides a spray packaging anti-clogging device, comprising: A spray assembly, used for atomizing and spraying liquid; including a spray head and a spray sheet; A pump assembly, used for sucking in and pumping out fluid; the pump assembly also includes a pump gas unit, used for sucking in and pumping out gas; An air flow control unit, including a position control valve, for controlling the gas delivery path and delivery timing, so that the gas is sprayed out at the end of the spray stroke to blow out the residual liquid in the spray assembly; The position control valve is arranged in the pump assembly and is opened or closed according to the position of the piston movement; The present invention cooperates with the pump air unit, the air flow control unit and the position control valve to spray gas at the end of the spray stroke to blow out the residual liquid in the spray component, thereby preventing the residual substances after the residual liquid evaporates from clogging the spray port or the liquid passage in the spray component, thereby achieving the anti-clogging effect in a simple and effective manner.

[0008] Further preferably, the pump body assembly has only one set, including a cylinder body, a piston and a piston rod, in which the pump air unit is arranged; The position control valve is arranged on the cylinder body. During the suction stroke, when the piston moves to a specific position of the cylinder body, the position control valve opens to realize air intake. After the spray stroke begins, the position control valve closes to build up pressure to realize pumping out. The airflow control unit also includes a pump outlet, which is arranged at the bottom of the cylinder or close to the bottom of the cylinder. Under the action of gravity, the gas is at the top and the liquid is at the bottom, so that the liquid is pumped out first and then the gas, which simply controls the timing of pumping out the gas.

[0009] Further preferably, a spray check valve is also provided in the delivery path, and the delivery channel is opened when the pressure in the cylinder reaches a designed value, so that the fluid reaches the spray plate and is sprayed out.

[0010] Further preferably, the spray one-way valve is composed of an elastic element with an umbrella-shaped structure, which elastically deforms when the umbrella surface is subjected to positive pressure, and the valve opens; when the inner side of the umbrella is subjected to reverse pressure, the umbrella forms a seal along the inner surface of the channel, and the valve closes.

[0011] Further optionally, the pump body components are in two groups, the first group of pump body components is used to suck in and pump out liquid, and the second group of pump body components constitutes a pump air unit, which is used to suck in and pump out gas; The first pump assembly comprises a first cylinder, a first piston, a first piston rod, a liquid inlet check valve and a liquid outlet check valve; The second pump assembly comprises a second cylinder, a second piston, a second piston rod and an intake check valve; The position control valve is arranged in the second group of pump body components. When the second piston rod descends to the end of the spray stroke, the position control valve opens to pump out gas.

[0012] Further preferably, the air intake check valve is formed by a combination of an elastic valve sheet provided on the second piston and an air intake hole provided on the second piston.

[0013] Further optionally, the second piston and the second piston rod slide together to form an air intake one-way valve.

[0014] Further preferably, the tail end of the second cylinder body is provided with an air storage chamber; Further preferably, the position control valve is composed of a sliding sealing ring and a through hole arranged on the cylinder wall. When the piston moves to the position where the valve needs to be opened, it contacts and pushes the sliding sealing ring to move axially, thereby opening the through hole. The through hole remains open during the subsequent process of the piston continuing to move until the piston returns to the next stroke, driving the sliding sealing ring to run in the opposite direction and closing the through hole.

[0015] Further preferably, the position control valve is composed of a sliding sealing sleeve arranged on the outside of the piston rod, a spring, a first air outlet channel arranged on the sliding sealing sleeve, a second air outlet channel arranged on the piston rod and a position control part arranged in the cylinder body. When the piston moves to the position where the valve needs to be opened, the sliding sealing sleeve touches the position control part, and the sliding sealing sleeve slides axially relative to the piston rod, so that the first air outlet channel and the second air outlet channel are connected to each other, opening the fluid channel until the piston returns to the next stroke, at which time the sliding sealing sleeve disengages from the position control part, and the sliding sealing sleeve is reset under the action of the spring force, so that the first air outlet channel and the second air outlet channel are staggered, and the fluid channel is closed.

[0016] Further preferably, the position control valve is composed of a sealing part arranged at the top of the piston rod, a valve stem in the middle of the piston rod, a spring under the piston rod, a valve stem support and a position control part arranged in the cylinder body; when the piston descends to the position where the valve needs to be opened, the valve stem support is blocked by the position control part, and the valve stem slides upward relative to the piston rod, driving the sealing part to move upward to open the position control valve and open the fluid channel, until the piston returns to the next stroke, at which time the valve stem support disengages from the position control part, and the valve stem is reset under the action of the spring force, driving the sealing part to move downward, and closing the fluid channel.

[0017] Beneficial effect: The present invention introduces a gas purge method into the spray package to blow out the residual liquid in the spray component, so that the spray component including the nozzle remains in an empty state, thereby avoiding the residual substances remaining in the spray component after the liquid evaporates and clogging the nozzle or the liquid passage in the spray component. Specifically, the present invention is to control the timing of gas intake and pumping out by the cooperation of the pump air unit, the position control valve and the air flow control unit, so that the spray package can spray gas at the end of the spray stroke, thereby blowing out the residual liquid in the spray component passage, emptying the spray component passage, and avoiding blockage caused by drying of the residue. Therefore, the technical method or device scheme of the present invention can simply and effectively solve the blockage problem of the spray device of a specific product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] In the attached picture: Figure 1 is a cross-sectional view of the piston in the highest position according to the specific embodiment 1 of the present invention; Figure 2 is a cross-sectional view of the piston in the lowest position according to the specific embodiment 1 of the present invention; Figure 3 It is a cross-sectional view of the piston of the specific embodiment 1 of the present invention in the suction stroke and triggering the position control valve to be opened; Figure 4 is a cross-sectional view of a piston in a second specific embodiment of the present invention in a highest position; Figure 5 is a cross-sectional view of a piston in a third specific embodiment of the present invention in a highest position; Figure 6 is a cross-sectional view of a piston in a fourth specific embodiment of the present invention in a highest position; Figure 7is a cross-sectional view of a piston in a specific embodiment 4 of the present invention in the lowest position; Figure 8 It is a cross-sectional view of a specific embodiment 4 of the present invention, in which the piston is in a spray stroke and the trigger position control valve is about to open; Fig. 9 is a cross-sectional view of a piston in a fifth specific embodiment of the present invention in a highest position; Fig.10 It is a cross-sectional view of a piston in a specific embodiment 5 of the present invention in a spray stroke and an air intake check valve is closed; Fig.11 It is a cross-sectional view of the piston of the specific embodiment 5 of the present invention in the spray stroke and the trigger position control valve is about to open; Fig.12 is a cross-sectional view of a piston in a specific embodiment 5 of the present invention in the lowest position; Among them: 1 is a cylinder body, 1.1 is a first cylinder body, 1.2 is a second cylinder body, 1.5 is a cylinder body ventilation hole, 1.6 is a through hole, 2 is a piston, 2.1 is a first piston, 2.2 is a second piston, 2.3 is a piston air intake channel, 2.7 is an air intake hole, 3 is a piston rod, 3.1 is a first piston rod, 3.2 is a second piston rod, 3.3 is a second air outlet channel, 3.4 is a first piston stopper, 3.5 is a piston rod ventilation channel, 3.6 is a liquid outlet one-way valve hole, 3.7 is a second piston rod air intake channel, 5 is a connecting cover, 5. 3 is an air storage chamber, 5.5 is a ventilation hole of a connecting cover, 5.7 is a position control unit, 6 is a conveying path, 6.1 is a pump outlet, 7.1 is a sliding sealing sleeve, 7.2 is a sealing unit, 7.3 is a first air outlet channel, 7.5 is a valve stem, 7.7 is a spring, 7.9 is a valve stem support, 8 is a spray head seat, 10 is a spray head, 11 is a button cover, 12 is a return spring, 13 is a sliding sealing ring, 15 is a spray sheet, 16 is a liquid inlet check valve, 17 is a spray outlet check valve, 17.1 is an umbrella surface, 17.2 is an umbrella lining, and 18 is an elastic valve sheet. DETAILED DESCRIPTION

[0020] It should be noted that: in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other; the described embodiments are only embodiments of a part of the present invention, not all of the embodiments; the following description of the embodiments is merely illustrative, to facilitate a better understanding of the present invention, and does not constitute an improper limitation of the present invention; in addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0021] The series of embodiments of the present application and the features contained therein can be applied to various product solutions that require anti-clogging spray packaging, such as daily chemical products, medicines, cosmetics, foods, condiments, etc., and similar effects can be achieved by applying any of the methods and series of embodiments of the present application, or by recombining and designing other similar technical solutions using the various technical features in the present application. The series of embodiments of the present application can also be applied to any other scenarios that require anti-clogging spray packaging that can be foreseen in the future.

[0022] The present invention will be further described below in conjunction with the accompanying drawings. Several embodiments in the accompanying drawings are specific devices that use a spray packaging anti-clogging method of the present invention.

[0023] See also Figures 1 to 3 , Specific embodiment 1, a spray packaging anti-clogging device, comprising: a spray assembly, a pump body assembly, an airflow control unit and a position control valve thereof; The spray assembly is used to atomize and spray the liquid, and includes a spray head 10 and a spray sheet 15; The pump assembly is used to inhale and pump out fluid, and includes a cylinder 1, a piston 2 and a piston rod 3. The pump assembly also includes a pumping unit, which is arranged on the upper section of the cylinder 1 and is used to inhale and pump out gas. The position control valve is arranged at the upper part of the cylinder body 1. In the latter part of the suction stroke, when the piston 2 moves to the upper part of the cylinder body 1, the position control valve is opened to realize air intake. After the spray stroke starts, the position control valve is closed to build up pressure to realize pumping. Specifically, the position control valve of this embodiment is composed of a sliding sealing ring 13 and a through hole 1.6 arranged on the cylinder body wall. When the piston 2 runs to the latter part of the suction stroke, the piston 2 contacts and pushes the sliding sealing ring 13 to move axially upward, opening the through hole 1.6 to realize air intake. In the subsequent process in which the piston 2 continues to move upward, the through hole 1.6 remains open, and the cylinder body continues to inhale gas until the piston 2 returns to the spray stroke, driving the sliding sealing ring 13 to slide in the opposite axial direction, and the through hole 1.6 is closed. When the piston 2 continues to move downward, pressure is built up to realize pumping.

[0024] The airflow control unit comprises the above-mentioned position control valve and a pump outlet 6.1 arranged near the bottom of the cylinder body, which is used to control the delivery path and delivery timing of the fluid; in the latter part of the suction stroke, the position control valve functions to allow the cylinder body to inhale gas, and after the suction stroke, the cylinder body contains both liquid and gas; in the spray stroke, because the pump outlet 6.1 is close to the bottom of the cylinder body, under the action of gravity, the gas is on the top and the liquid is on the bottom, thereby achieving the effect of pumping out the liquid first and then the gas, thus simply controlling the timing of pumping out the gas, so that the anti-clogging spray device sprays gas at the end of the spray stroke to blow out the residual liquid in the spray assembly.

[0025] The delivery path 6 is also provided with a spray check valve 17. During the spray stroke, as the pressure in the cylinder increases, when it reaches the designed value, the spray check valve 17 opens the delivery channel, and the fluid reaches the spray sheet and is sprayed out. The spray check valve 17 of this embodiment is composed of an elastic element with an umbrella structure. When the umbrella surface 17.1 is subjected to positive pressure, it is elastically deformed and the valve is opened. When the umbrella inner 17.2 is subjected to reverse pressure, the umbrella edge is close to the inner surface of the channel to form a seal, and the valve is closed.

[0026] See also Figure 4 Specific embodiment 2 is generally similar to specific implementation scheme 1, the difference is that the spray check valve 17 uses a plastic check valve composed of a plastic spring and a sealing structure. Of course, if the user does not require a full plastic device, the check valve can also be replaced with a metal spring-driven check valve.

[0027] See also Figure 5 , Specific embodiment 3 is generally similar to specific embodiment 1, except that the ejection check valve 17 is composed of a gravity-driven sealing weight part. When there is positive pressure, the pressure of the fluid overcomes the weight of the sealing weight part and the valve opens. When there is zero pressure or negative pressure, the valve is closed by gravity to prevent backflow. The sealing weight part is mostly made into a spherical shape, but can also be made into a cone or other shapes. The material can be one or a combination of several materials such as plastic, metal, glass, and ceramic.

[0028] See also Figures 6 to 8 , Specific embodiment 4, a spray packaging anti-clogging device, comprising: a spray assembly, a pump body assembly, an airflow control unit and a position control valve thereof; The spray assembly comprises a spray head 10 and a spray sheet 15; There are two groups of pump body assemblies, and the two groups of pump body assemblies are coaxially arranged. The first group of pump body assemblies is used to inhale and pump out liquid and is arranged at the bottom. The second group of pump body assemblies constitutes a pump air unit, which is used to inhale and pump out gas and is arranged at the top. The first group of pump body assemblies includes a first cylinder body 1.1, a first piston 2.1, a first piston rod 3.1, a liquid inlet check valve 16 and a liquid outlet check valve; the second group of pump body assemblies includes a second cylinder body 1.2, a second piston 2.2, a second piston rod 3.2 and an air inlet check valve.

[0029] The air intake check valve is formed by a combination of an elastic valve sheet 18 provided on the second piston and an air intake hole 2.7 provided on the second piston. After the suction stroke starts, as the piston 2.2 moves upward, the pressure in the cylinder body 1.2 drops to form a negative pressure. At this time, the zero-pressure gas outside the cylinder body 1.2 pushes the elastic valve sheet 18 open through the air intake hole 2.7 to achieve air intake; when the spray stroke starts, the piston 2.2 moves downward, the pressure in the cylinder body 1.2 rises, and the lower surface of the elastic valve sheet is pressed against the air intake hole 2.7 and blocks it, the air intake check valve is closed, and the pump output pressure is established.

[0030] The position control valve opens or closes the control valve according to the position of the piston movement; the position control valve is composed of a sliding sealing sleeve 7.1 arranged outside the second piston rod 3.2, a spring 7.7 of the position control valve, and a first air outlet channel 7.3 arranged on the sliding sealing sleeve and a second air outlet channel 3.3 arranged on the piston rod. When the piston 2.2 moves to the position where the valve needs to be opened, the sliding sealing sleeve 7.1 touches the position control part 5.7, and the sliding sealing sleeve 7.1 slides axially relative to the second piston rod 3.2, so that the first air outlet channel 7.3 and the second air outlet channel 3.3 are connected to open the fluid channel until the piston returns to the next stroke, and the sliding sealing sleeve 7.1 is separated from the position control part 5.7, and the sliding sealing sleeve 7.1 is reset under the action of the spring force, so that the first air outlet channel 7.3 and the second air outlet channel 3.3 are staggered, and the valve is closed.

[0031] The air flow control unit includes the above-mentioned position control valve, which is used to control the delivery path and delivery timing of the fluid. Under the action of the position control valve, the high-pressure gas compressed in the second cylinder body 1.2 will be sprayed out at the end of the spray stroke as the position control valve opens, blowing out the residual liquid in the spray assembly to achieve an anti-clogging effect.

[0032] See also Figures 9 to 12 , Specific embodiment 5, a spray packaging anti-clogging device, comprising: a spray assembly, a pump body assembly, an airflow control unit and a position control valve thereof; The spray assembly comprises a spray head 10 and a spray sheet 15; The pump body assembly is used to inhale and pump out fluid; there are two groups of pump body assemblies, and the two groups of pump body assemblies are non-coaxially arranged. The first group of pump body assemblies is used to inhale and pump out liquid and is arranged at the lower part of the side close to the spray plate. The second group of pump body assemblies constitutes a pump air unit, which is used to inhale and pump out gas and is arranged at the upper part of the side away from the spray plate; the first group of pump body assemblies includes a first cylinder body 1.1, a first piston 2.1, a first piston rod 3.1, a liquid inlet check valve 16 and a liquid outlet check valve; the second group of pump body assemblies includes a second cylinder body 1.2, a second piston 2.2, a second piston rod 3.2 and an air inlet check valve.

[0033] The air intake check valve is formed by the second piston 2.2 and the second piston rod 3.2 slidingly cooperating with each other. When the piston 2.2 is in the suction stroke, the piston 2.2 is at the lower end position of the piston rod 3.2, and the second piston rod air intake channel 3.7 is opened to achieve air intake. When the piston is in the spray stroke, the piston rod 3.2 moves downward, and under the influence of friction, the piston slides upward relative to the piston rod, blocking the second piston rod air intake channel 3.7 and establishing pump-out pressure.

[0034] The tail end of the second cylinder 1.2 is also provided with an air storage chamber 5.3 for storing air during the downward movement of the piston 2.2, which can significantly reduce the reaction force borne by the piston 2.2 during the gas compression process, thereby obtaining a suitable pump output.

[0035] The position control valve opens or closes the control valve according to the position of the piston movement; the position control valve is composed of a sealing portion 7.2 of the position control valve arranged at the top of the second piston rod 3.2, a valve stem 7.5 of the position control valve arranged coaxially with the second piston rod 3.2, a spring 7.7 of the position control valve arranged at the lower part of the piston rod 3.2, and a valve stem support 7.9; when the piston 2.2 moves downward to the position where the valve needs to be opened, the valve stem support 7.9 is blocked by the position control portion 5.7, the valve stem 7.5 slides upward relative to the second piston rod 3.2, driving the sealing portion 7.2 to move upward, the position control valve is opened, and the fluid channel is opened until the piston returns to the next stroke, the valve stem support 7.9 disengages from the position control portion 5.7, the valve stem 7.5 is reset under the action of the spring force, driving the sealing portion 7.2 to move downward, and the valve is closed.

[0036] The air flow control unit includes the above-mentioned position control valve, which is used to control the delivery path and delivery timing of the fluid. Under the action of the position control valve, the high-pressure gas compressed in the second cylinder 1.2 and the air storage chamber 5.3 will be sprayed out at the end of the spray stroke as the position control valve is opened, blowing out the residual liquid in the spray assembly to achieve an anti-clogging effect.

[0037] In summary, it can be seen from several embodiments that we mainly solve the problem effectively by introducing a gas purging method; that is, as long as there is a pump air unit and pressurized gas is generated in the pump air unit, and then cooperate with the key technical features such as the air flow control unit and its position control valve to control the pressurized gas to be sprayed out at the end of the spray stroke, and blow out the residual liquid in the spray assembly, it is possible to avoid liquid residue, and also avoid the residual substances after the residual liquid evaporates to block the spray port or the liquid passage in the spray assembly, thus achieving the anti-blocking effect in a simple and effective way. At the same time, the umbrella-shaped one-way valve can simplify the structure of the anti-blocking spray device and effectively reduce costs. The setting of the air storage chamber not only improves the air storage capacity of the pump air unit, but also adjusts the pressure in the cylinder, so that the reaction force borne by the pump air piston is reduced, thereby obtaining a more optimized pumping force, which ensures the gas purging effect on the one hand and improves the user experience on the other.

[0038] The above are only optional implementation modes of the present invention. It should be pointed out that, for ordinary technicians in this technical field, without making any creative work, it is also possible to use the method and related principles of the present invention as a premise, combine the various technical features of the present invention, design more technical solutions or make several improvements and modifications. All other embodiments thus obtained should be regarded as the protection scope of the present invention.

Claims

1. A method for preventing clogging of a spray package, characterized in that: The following steps are involved: Using the pump assembly to suck in liquid; The gas is sucked in by utilizing the pumping function provided in the pump body assembly; Pressurize the liquid to pump it out to the spray assembly and spray the liquid in mist form; The gas is pressurized, and when the liquid pumping process is about to be completed or has been completed, the gas delivery channel is opened to spray gas to blow out the residual liquid in the spray assembly, so that the spray assembly including the nozzle remains empty.

2. A spray packaging anti-clogging device, characterized in that: include: A spray assembly, used for atomizing and spraying liquid; including a spray head and a spray sheet; A pump assembly, used for sucking in and pumping out fluid; the pump assembly also includes a pump gas unit, used for sucking in and pumping out gas; An air flow control unit, including a position control valve, is used to control the gas delivery path and delivery timing so that the gas is sprayed out at the end of the spray stroke; The position control valve is arranged in the pump body assembly, and is opened or closed according to the position of the piston movement.

3. The anti-clogging device for spray packaging according to claim 2, characterized in that: The pump assembly has only one set, including a cylinder, a piston and a piston rod, in which the pump air unit is arranged; The position control valve is arranged on the cylinder body. During the suction stroke, when the piston moves to a specific position of the cylinder body, the position control valve opens to realize air intake. After the spray stroke begins, the position control valve closes to build up pressure to realize pumping out. The airflow control unit further comprises a pump outlet, and the pump outlet is arranged at the bottom of the cylinder body or a position close to the bottom of the cylinder body.

4. The anti-clogging device for spray packaging according to claim 3, characterized in that: The delivery path is also provided with a spray check valve, which opens the delivery channel when the pressure in the cylinder reaches the designed value, so that the fluid reaches the spray sheet and is sprayed out.

5. The anti-clogging device for spray packaging according to claim 4, characterized in that: The ejection check valve is composed of an elastic element of an umbrella-shaped structure. When the umbrella surface is subjected to positive pressure, it will produce elastic deformation and the valve will open. When the inner side of the umbrella is subjected to reverse pressure, the umbrella will form a seal against the inner surface of the channel and the valve will close.

6. The anti-clogging device for spray packaging according to claim 2, characterized in that: The pump body components are divided into two groups, the first group of pump body components is used for sucking in and pumping out liquid, and the second group of pump body components constitutes a pump gas unit for sucking in and pumping out gas; The first pump assembly comprises a first cylinder, a first piston, a first piston rod, a liquid inlet check valve and a liquid outlet check valve; The second pump assembly comprises a second cylinder, a second piston, a second piston rod and an intake check valve; The position control valve is arranged in the second group of pump body components. When the second piston rod descends to the end of the spray stroke, the position control valve opens to pump out gas.

7. The anti-clogging device for spray packaging according to claim 6, characterized in that: The air intake check valve is formed by combining an elastic valve sheet arranged on the second piston and an air intake hole arranged on the second piston.

8. The anti-clogging device for spray packaging according to claim 6, characterized in that: The second piston and the second piston rod are slidably matched with each other to form the air intake one-way valve.

9. The anti-clogging device for spray packaging according to claim 6, characterized in that: The tail end of the second cylinder body is provided with an air storage chamber.

10. An anti-clogging device for spray packaging according to any one of claims 2 to 9, characterized in that: The position control valve is composed of a sliding sealing ring and a through hole arranged on the cylinder wall. When the piston moves to the position where the valve needs to be opened, it contacts and pushes the sliding sealing ring to move axially, opening the through hole. The through hole remains open during the subsequent process of the piston continuing to move until the piston returns to the next stroke, driving the sliding sealing ring to run in the reverse direction and closing the through hole.

11. An anti-clogging device for spray packaging according to any one of claims 2 to 9, characterized in that: The position control valve is composed of a sliding sealing sleeve arranged outside the piston rod, a spring, a first air outlet channel arranged on the sliding sealing sleeve, a second air outlet channel arranged on the piston rod and a position control part arranged in the cylinder body. When the piston moves to the position where the valve needs to be opened, the sliding sealing sleeve touches the position control part, and the sliding sealing sleeve slides axially relative to the piston rod, so that the first air outlet channel and the second air outlet channel are connected to each other, opening the fluid channel. Until the piston returns to the next stroke, the sliding sealing sleeve is separated from the position control part, and the sliding sealing sleeve is reset under the action of the spring force, so that the first air outlet channel and the second air outlet channel are staggered, and the fluid channel is closed.

12. An anti-clogging device for spray packaging according to any one of claims 2 to 9, characterized in that: The position control valve is composed of a sealing part arranged at the end of the piston rod, a valve stem coaxial with the piston rod, a spring at the other end of the piston rod, a valve stem support and a position control part arranged in the cylinder body. When the piston descends to the position where the valve needs to be opened, the valve stem support is blocked by the position control part, and the valve stem slides up relative to the piston rod, driving the sealing part to move up to open the position control valve and open the fluid channel. Until the piston returns to the next stroke, the valve stem support is separated from the position control part, and the valve stem is reset under the action of the spring force, driving the sealing part to move down, and the fluid channel is closed.

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