A sound attenuation structure for a foam pump

Abstract

The utility model discloses a kind of sound attenuation structures for foam pump, it is related to foam pump technical field, including pump body, piston, pump rod and valve;Piston is located in pump body and is connected pump rod, and communication mixing chamber and gas flow channel are equipped between piston and pump rod, there is the liquid flow channel of connecting mixing chamber in pump rod, and valve is located in gas flow channel control its on-off.Valve contains the connecting part of connecting piston and the first annular valve piece of connecting connecting part, and gas flow channel is closed when first annular valve piece and pump rod abut, and open when separating;First annular valve piece is equipped with several abutment parts extending towards pump rod outer wall in the circumference of pump rod side, and abutment part is always in abutment with pump rod outer wall.The structure provides support for first annular valve piece by abutment part, avoid its airflow impact under vibration to generate noise, while guaranteeing sealing and structural stability, improve use experience, and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of foam pump technology, and in particular to a noise reduction structure for foam pumps. Background Technology

[0002] In daily life and industrial production, foam pumps, as a conveying device that can mix liquids and gases to generate foam, are widely used in various scenarios such as daily chemical products (e.g., hand sanitizer, shower gel), cleaning products (e.g., foam cleaners), and medical care. Their core function lies in achieving precise mixing of liquids and gases through specific structural design, ultimately outputting uniform and fine foam to meet the needs of different application scenarios for foam morphology and performance. Existing foam pumps typically consist of a pump body, pump head, piston, pump rod, valves, and other key components that work together to generate foam. The pump rod, serving as a crucial channel for liquid and gas flow, has a dedicated liquid channel internally. One end of this channel connects to the liquid storage space inside the pump body, while the other end extends to the area where it engages with the piston. At the point where the pump rod and piston meet, a gas channel is also provided, forming a mixing chamber that communicates with both the liquid and gas channels. This mixing chamber is the core area where the liquid and gas mix to generate foam. To control the gas flow, existing foam pumps usually incorporate valves in the gas channel to regulate the timing and flow rate of gas entering the mixing chamber. In practical use, when a downward force is applied to the pump head, the pump head will drive the piston and pump rod, and other related components, to move downwards simultaneously. During this process, the internal spatial structure of the pump body changes, resulting in a negative pressure environment in the mixing chamber and related flow channels. Under the action of negative pressure, the valve, which was originally closed, will open, allowing external gas to smoothly enter the mixing chamber along the gas flow channel. At the same time, the liquid in the pump body's liquid storage space will also enter the mixing chamber through the liquid flow channel under the action of the pressure difference. The liquid and gas entering the mixing chamber will impact and stir each other within the chamber, thereby achieving thorough gas-liquid mixing and ultimately forming foam, which will be discharged through the corresponding outlet. When the external force on the pump head disappears, under the action of the internal reset structure (such as a spring) of the foam pump, the pressure inside the pump body gradually returns to a balanced state. At this time, the valve will close again, thus sealing the gas flow channel to prevent liquid backflow or gas from entering arbitrarily, preparing for the next foaming operation. In existing foam pump valve designs, the valve mainly consists of a single annular valve plate, typically made of a material with a certain degree of elasticity. Its installation position aligns with the pump rod to achieve sealing and opening control of the gas flow path. Under negative pressure, the annular valve plate undergoes elastic deformation due to the force, separating from the sealing surface of the pump rod. This creates a gap between the annular valve plate and the pump rod, allowing gas to pass through smoothly into the mixing chamber. However, this design, relying solely on a single annular valve plate for sealing and opening, has a significant drawback: due to the lack of an effective support structure, the airflow continuously impacts and disturbs the valve plate as it flows through the gap, causing irregular vibrations. These vibrations produce noticeable noise, negatively impacting the user experience, and this problem is even more pronounced in scenarios with high noise control requirements. Further research revealed a significant correlation between the probability of noise generation by the annular valve disc and its diameter. A larger disc diameter results in relatively weaker overall rigidity, leading to increased deformation and vibration amplitude under airflow, thus significantly increasing the probability of noise generation. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a noise reduction structure for a foam pump.

[0004] A noise reduction structure for a foam pump designed for this purpose includes a pump body, a piston, a pump rod, and a valve; The piston is disposed within the pump body and connected to the pump rod; a mixing chamber and a gas flow channel are provided between the piston and the pump rod; a liquid flow channel is provided within the pump rod and is connected to the mixing chamber; the valve is disposed within the gas flow channel and is used to control the opening or closing of the gas flow channel. The valve includes a connecting portion connected to the piston and a first annular valve plate connected to the connecting portion; When the first annular valve plate abuts against the pump rod, the gas flow channel is in a closed state; when the first annular valve plate separates from the pump rod, the gas flow channel is in an open state. The first annular valve plate has several abutment portions arranged circumferentially on the side near the pump rod. The abutment portions extend toward the outer wall of the pump rod and abut against the outer wall of the pump rod.

[0005] Preferably, the piston is provided with an air inlet, and the connecting part is connected to a second annular valve plate; When the second annular valve plate abuts against the piston, the air inlet is in a closed state; when the second annular valve plate separates from the piston, the air inlet is in an open state.

[0006] Preferably, the pump rod includes a first rod body, a valve body boss, and a second rod body connected in sequence; The first rod is connected to the piston; the gas flow channel is disposed between the first rod and the piston; When the first annular valve plate abuts against the upper surface of the valve body protrusion, the gas flow channel is in a closed state; when the first annular valve plate separates from the upper surface of the valve body protrusion, the gas flow channel is in an open state. When the gas flow channel is in a closed or open state, the abutting part remains in contact with the outer wall of the first rod.

[0007] Preferably, the mixing chamber is located inside the piston above the first rod.

[0008] Preferably, the connecting part, the first annular valve plate, and the abutting part are an integral structure.

[0009] Preferably, the connecting portion has a ring structure.

[0010] Compared with existing technologies, this invention effectively solves the technical problem of noise generation caused by vibration of the annular valve plate in existing foam pumps due to lack of support, through innovative valve design. This structure features several abutment portions arranged circumferentially on the side of the first annular valve plate near the pump rod, and these abutment portions always maintain contact with the outer wall of the pump rod. Compared to existing unsupported annular valve plates, these abutment portions provide uniform and stable radial support for the first annular valve plate, effectively suppressing the impact disturbance of gas flowing through the valve plate, significantly reducing the amplitude and frequency of irregular vibration of the valve plate, and fundamentally reducing noise generation. Attached Figure Description

[0011] Figure 1 This is one of the schematic diagrams of the cross-sectional structure of a foam pump; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is the second schematic diagram of the cross-sectional structure of a foam pump; Figure 4 This is a schematic diagram of the assembly of the pump rod and the valve; Figure 5 This is a schematic diagram showing the exploded structure of the pump rod and valve. Figure 6 This is one of the three-dimensional structural diagrams of a valve; Figure 7 This is one of the three-dimensional structural diagrams of a valve. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] See Figures 1-7 A noise reduction structure for a foam pump includes a pump body 10, a piston 20, a pump rod 30, and a valve 40. The piston 20 is disposed within the pump body 10 and connected to the pump rod 30. A mixing chamber 130 and a gas flow channel 120 are provided between the piston 20 and the pump rod 30. A liquid flow channel 110 is provided within the pump rod 30 and is connected to the mixing chamber 130. The valve 40 is disposed in the gas flow channel 120 and is used to control the opening or closing of the gas flow channel 120. The valve 40 includes components connected to the piston 20. The system includes a connecting portion 410 connected to the pump rod 30 and a first annular valve plate 420 connected to the connecting portion 410; when the first annular valve plate 420 abuts against the pump rod 30, the gas flow channel 120 is in a closed state; when the first annular valve plate 420 is separated from the pump rod 30, the gas flow channel 120 is in an open state; the first annular valve plate 420 has a plurality of abutting portions 400 arranged circumferentially on the side near the pump rod 30, the abutting portions 400 extending toward the outer wall of the pump rod 30 and abutting against the outer wall of the pump rod 30.

[0014] The noise-reducing structure used in foam pumps achieves the function of gas-liquid mixing and foaming through the coordinated cooperation of various components, while solving the noise problem with the design of the contact part. Its specific working principle can be divided into two core stages: "pump head pressing down to foam" and "external force disappearing and resetting". The detailed process is as follows: When the user applies a downward force to the pump head of the foam pump (not marked in the figure, but linked with piston 20 and pump rod 30), the pump head will drive piston 20 and pump rod 30 connected to it to move downward synchronously, and a negative pressure environment will be formed inside the pump body 10. Under negative pressure, the first annular valve plate 420, which was originally in contact with the outer wall of the pump rod 30, undergoes elastic deformation and gradually separates from the sealing surface of the pump rod 30, thereby switching the gas flow channel 120 from a closed state to an open state. During this process, several abutment portions 400 arranged circumferentially on the side of the first annular valve plate 420 near the pump rod 30 always remain in contact with the outer wall of the pump rod 30. On the one hand, the abutment portions 400 provide uniform radial support for the first annular valve plate 420, preventing it from vibrating irregularly under negative pressure and airflow impact. On the other hand, the presence of the abutment portions 400 does not hinder the normal deformation of the first annular valve plate 420, but only limits its excessive shaking, thereby eliminating noise while ensuring the smooth opening of the gas flow channel 120. As the gas flow channel 120 opens, external air continuously enters the mixing chamber 130 along the gas flow channel 120; simultaneously, the liquid stored in the pump body 10, under the action of pressure difference, also flows into the mixing chamber 130 through the liquid flow channel 110 inside the pump rod 30. The gas and liquid entering the mixing chamber 130 collide with each other, achieving thorough gas-liquid mixing, ultimately forming uniform and fine foam, which is then discharged through the pump head outlet corresponding to the mixing chamber 130, completing the foaming process. When the user releases the pump head, the external force applied to the pump rod 30 disappears, and the reset component inside the foam pump (such as a spring, not shown in the figure) generates a reset force, pushing the piston 20 and the pump rod 30 upward, gradually restoring the pressure balance inside the pump body 10. As the negative pressure environment in the mixing chamber 130 and the gas flow channel 120 disappears, the first annular valve plate 420, under the action of its own elastic restoring force, will gradually reset and re-abut against the sealing surface of the pump rod 30. At this time, the abutting part 400 on the first annular valve plate 420 still abuts against the outer wall of the pump rod 30, assisting the first annular valve plate 420 to achieve precise reset, ensuring that it fits tightly against the sealing surface of the pump rod 30, thereby closing the gas flow channel 120 again, preventing the liquid in the mixing chamber 130 from flowing back through the gas flow channel 120, or preventing external impurities from entering the pump body 10. At this point, the entire foam pump completes one "pressure-foaming-reset-close" work cycle, awaiting the next external force to drive it and repeat the process. Throughout this process, the contact part 400 consistently provides support and auxiliary sealing, solving the noise problem of traditional annular valve plates and ensuring the stability and sealing of valve 40 during opening and closing, thus guaranteeing the continuous and reliable operation of the foam pump. See Figure 2 and Figure 3 The piston 20 is provided with an air inlet 210, and the connecting part 410 is connected to a second annular valve plate 430; when the second annular valve plate 430 abuts against the piston 20, the air inlet 210 is in a closed state; when the second annular valve plate 430 separates from the piston 20, the air inlet 210 is in an open state. The core function of this embodiment is that when the pump head is pressed down and a negative pressure is formed between the mixing chamber 130 and the gas flow channel 120, the second annular valve plate 430 separates from the piston 20 under the action of the negative pressure, so that the air inlet 210 is opened. External air can enter the gas flow channel 120 through the air inlet 210 to supplement the gas in the mixing chamber 130, ensuring the amount of gas required for gas-liquid mixing and ensuring normal foam generation. When the pump head is reset and the pressure inside the pump body 10 is balanced, the second annular valve plate 430 abuts against the piston 20 under its own elasticity and pressure, closing the air inlet 210. This can prevent the liquid or foam in the mixing chamber 130 from flowing back through the air inlet 210, and at the same time prevent external impurities from entering the pump body 10, ensuring the stability and sealing of the foam pump operation.

[0015] See Figure 5 The pump rod 30 includes a first rod body 310, a valve body boss 320, and a second rod body 330 connected in sequence; the first rod body 310 is connected to the piston 20; the gas flow channel 120 is disposed between the first rod body 310 and the piston 20; when the first annular valve plate 420 abuts against the upper surface of the valve body boss 320, the gas flow channel 120 is in a closed state; when the first annular valve plate 420 separates from the upper surface of the valve body boss 320, the gas flow channel 120 is in an open state; when the gas flow channel 120 is in a closed state or an open state, the abutting part 400 abuts against the outer wall of the first rod body 310. In this embodiment, the segmented design of the first rod 310, valve body boss 320, and second rod 330 of the pump rod 30 provides a structural basis for the control and noise reduction of the gas flow channel 120: the first rod 310 cooperates with the piston 20 to form the gas flow channel 120, and the valve body boss 320 precisely controls the opening and closing of the gas flow channel 120 by abutting or separating from the first annular valve plate 420; and regardless of the state of the gas flow channel 120, the abutting part 400 always abuts against the outer wall of the first rod 310, which not only provides support for the first annular valve plate 420 to reduce noise, but also ensures structural stability.

[0016] In this invention, the mixing chamber 130 is disposed inside the piston 20 above the first rod 310.

[0017] In this utility model, the connecting part 410, the first annular valve plate 420, and the abutting part 400 are an integral structure.

[0018] In this invention, the connecting part 410 has a ring structure.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A noise reduction structure for a foam pump, comprising a pump body (10), a piston (20), a pump rod (30), and a valve (40). The piston (20) is disposed inside the pump body (10) and connected to the pump rod (30); a mixing chamber (130) and a gas flow channel (120) are provided between the piston (20) and the pump rod (30); a liquid flow channel (110) is provided inside the pump rod (30) and is connected to the mixing chamber (130); the valve (40) is disposed in the gas flow channel (120) and is used to control the opening or closing of the gas flow channel (120); Its features are: The valve (40) includes a connecting part (410) connected to the piston (20) and a first annular valve plate (420) connected to the connecting part (410). When the first annular valve plate (420) abuts against the pump rod (30), the gas flow channel (120) is in a closed state; when the first annular valve plate (420) separates from the pump rod (30), the gas flow channel (120) is in an open state. The first annular valve plate (420) has a plurality of abutment portions (400) arranged circumferentially on the side near the pump rod (30). The abutment portions (400) extend toward the outer wall of the pump rod (30) and abut against the outer wall of the pump rod (30).

2. The silencing structure for a foam pump according to claim 1, characterized in that: The piston (20) is provided with an air inlet (210), and the connecting part (410) is connected to a second annular valve plate (430). When the second annular valve plate (430) abuts against the piston (20), the air inlet (210) is in a closed state; when the second annular valve plate (430) separates from the piston (20), the air inlet (210) is in an open state.

3. The silencing structure for a foam pump according to claim 1, characterized in that: The pump rod (30) includes a first rod body (310), a valve body boss (320) and a second rod body (330) connected in sequence. The first rod (310) is connected to the piston (20); the gas flow channel (120) is disposed between the first rod (310) and the piston (20); When the first annular valve plate (420) abuts against the upper surface of the valve body boss (320), the gas flow channel (120) is in a closed state; when the first annular valve plate (420) separates from the upper surface of the valve body boss (320), the gas flow channel (120) is in an open state. When the gas flow channel (120) is in a closed or open state, the abutment part (400) remains in contact with the outer wall of the first rod body (310).

4. The silencing structure for a foam pump according to claim 3, characterized in that: The mixing chamber (130) is located inside the piston (20) above the first rod (310).

5. A noise reduction structure for a foam pump according to claim 1, characterized in that: The connecting part (410), the first annular valve plate (420), and the abutting part (400) are an integral structure.

6. The silencing structure for a foam pump according to claim 1, characterized in that: The connecting part (410) has a ring structure.

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