Bubble removing structure of corrugated pipe in constant flow pump

Abstract

According to the bubble removing structure of the corrugated pipe in the constant flow pump, in the process that liquid enters the pump head, the liquid firstly flows in through the liquid inlet and enters the variable cavity through the impact groove formed in the pump head. The axis of the impact groove faces the inner wrinkled area of the corrugated pipe, and liquid can form directional liquid flow with certain kinetic energy when flowing through the impact groove to directly impact the inner wrinkled surface of the corrugated pipe. Under the action of the impact flow, bubbles in the wrinkled area are effectively disturbed and scoured in the liquid inlet process and enter the main body part of the corrugated pipe along with the liquid. Due to the directional flushing effect of the liquid, the filling degree of the liquid in the corrugated pipe is remarkably improved, and the problem that the size is unstable due to residual bubbles is solved. By arranging the impact groove and guiding liquid inlet fluid to directly scour the wrinkled part of the corrugated pipe, residual bubbles in dead corners of the structure can be effectively removed, bubble accumulation or retention is avoided, and therefore sufficient filling of a cavity of the corrugated pipe is achieved.

Description

Technical Field

[0001] This application relates to the field of constant flow pumps, and more particularly to a degassing structure for a bellows in a constant flow pump. Background Technology

[0002] A constant flow pump (also known as a steady flow pump) is a pump capable of outputting a stable flow rate, maintaining a constant liquid flow rate regardless of changes in back pressure or load. It is widely used in applications requiring precise liquid delivery and flow control, such as intravenous infusions in medicine, hemodialysis, and the dosing of fine chemicals in the chemical industry.

[0003] In some constant flow pumps (such as bellows pumps and diaphragm pumps), the bellows itself serves as a variable volume liquid cavity, thus acting as a liquid conveying element. Furthermore, the compression and stretching of each section of the bellows can accurately control the delivery of small flow rates of liquid, making the delivery flow rate more precise.

[0004] Existing bellows utilize a pleated shape to change the cavity volume by compressing or stretching the bellows, thereby adding a one-way valve pipeline for vacuum liquid inlet (when the volume is increased) and compression liquid outlet (when the volume is decreased), thus achieving the effect of precise liquid delivery.

[0005] However, due to the limitations of the inlet and outlet ports, some air will remain inside the empty bellows, resulting in some air in the folds. During use, the liquid cannot completely fill the entire bellows, and there are local air bubbles inside the bellows. As a result, during the compression and liquid discharge process, the volume change inside the bellows will be unstable due to the presence of air bubbles, which will lead to large changes in the liquid discharge and ultimately affect the output accuracy of the constant flow pump. Utility Model Content

[0006] In view of this, it is necessary to provide a degassing structure for the bellows in a constant flow pump to solve the above problems.

[0007] Embodiments of this application provide a degassing structure for a bellows in a constant flow pump, comprising:

[0008] A pump head has an inlet and an outlet, and the pump head is provided with an impact groove, which is connected to the inlet.

[0009] A bellows, one end of which is connected to the liquid inlet and the liquid outlet;

[0010] A drive unit is fixedly connected at one end to the end of the bellows away from the pump head. A variable cavity is formed between the bellows, the drive unit, and the pump head. The axis of the impact groove is oriented toward the variable cavity so that when liquid is introduced, the liquid at the inlet flushes the folds of the bellows through the impact groove.

[0011] In at least one embodiment of this application, the pump head is provided with a connecting portion, the connecting portion is partially housed within the bellows, and the impact groove is formed on the peripheral wall of the connecting portion and located within the variable cavity.

[0012] In at least one embodiment of this application, the impact groove extends through the connecting portion along an axial direction perpendicular to the connecting portion.

[0013] In at least one embodiment of this application, the width of the impact groove is denoted as a, and satisfies the relationship: 0.5mm < a < 1.5mm.

[0014] In at least one embodiment of this application, the pump head is provided with an inlet channel and a first connecting hole communicating with the inlet port, and the inlet channel is connected to the variable cavity;

[0015] The degassing structure of the bellows in the constant flow pump also includes:

[0016] A pressure plate is fixed to one end of the pump head near the drive component;

[0017] The first one-way valve assembly is located in the liquid inlet channel, with one end fixed to the pressure plate and the other end blocking or opening the first connecting hole so that the liquid inlet is isolated from or connected to the liquid inlet channel through the first connecting hole.

[0018] In at least one embodiment of this application, the first check valve assembly includes:

[0019] The first elastic element is fixed at one end to the pressure plate;

[0020] The first ball valve is fixedly connected to the end of the first elastic element away from the pressure plate and is used to block or open the first connecting hole.

[0021] In at least one embodiment of this application, the pressure plate is provided with a second communicating hole, the pump head is provided with a liquid outlet channel communicating with the liquid outlet, and the second communicating hole is communicating with the variable cavity;

[0022] The degassing structure of the bellows in the constant flow pump also includes:

[0023] The second one-way valve assembly is located in the liquid outlet channel. One end is fixed to the pressure plate, and the other end blocks or opens the second connecting hole so that the second connecting hole is isolated from or connected to the liquid outlet channel.

[0024] In at least one embodiment of this application, the second check valve assembly includes:

[0025] The second elastic element is fixed at one end to the pump head;

[0026] The second ball valve is located at one end of the second elastic element near the pressure plate.

[0027] In at least one embodiment of this application, the first check valve assembly is in the opposite direction to the second check valve assembly.

[0028] In at least one embodiment of this application, the degassing structure of the bellows in the constant flow pump further includes:

[0029] A connecting member is disposed within the liquid outlet channel and abuts against the pump head. The second elastic member abuts against the connecting member. The connecting member has a through hole that connects the liquid outlet and the liquid outlet channel.

[0030] The degassing structure of the bellows in the constant flow pump of this embodiment will have at least the following beneficial effects:

[0031] The degassing structure of the bellows in the constant flow pump described above allows the liquid to first flow in through the inlet and then enter the variable cavity through the impact groove located inside the pump head during the liquid entry process. The axis of the impact groove faces the internal pleated area of ​​the bellows, and the liquid forms a directional flow with a certain kinetic energy when flowing through the impact groove, directly impacting the inner pleated surface of the bellows.

[0032] Through the action of the aforementioned impinging flow, the air bubbles in the pleated area are effectively disturbed and flushed during the liquid inlet process, and then enter the main body of the bellows with the liquid. This directional flushing effect of the liquid significantly improves the liquid filling degree inside the bellows and reduces the volume instability problem caused by residual air bubbles.

[0033] By incorporating impact grooves and guiding the incoming fluid to directly flush the folds of the bellows, residual air bubbles in structural dead corners can be effectively removed, preventing bubble accumulation or retention and ensuring full filling of the bellows cavity. The de-bubbling structure reduces bubble interference, resulting in more consistent liquid discharge with each bellows deformation, effectively improving the output accuracy of the constant flow pump. Attached Figure Description

[0034] Figure 1 This is a structural diagram of the degassing structure of the bellows in a constant flow pump;

[0035] Figure 2 This is a cross-sectional view of the bubble removal structure of the bellows in a constant flow pump.

[0036] Figure 3 This is a structural diagram of the pump head.

[0037] Explanation of main component symbols

[0038] 100. The air-bubble removal structure of the bellows in a constant flow pump;

[0039] 110, Pump head; 110a, Liquid inlet; 110b, Liquid outlet; 110c, Impact tank; 100d, Variable cavity; 111, Connecting part; 100e, Liquid inlet channel; 110f, First connecting hole; 100g, Liquid outlet channel;

[0040] 120. Corrugated pipe;

[0041] 130. Driving components;

[0042] 140, pressure plate; 140a, second connecting hole;

[0043] 151. First elastic element; 152. First ball valve;

[0044] 161. Second elastic element; 162. Second ball valve;

[0045] 170, Connecting component; 170a, Through hole. Detailed Implementation

[0046] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0048] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] Embodiments of this application provide a degassing structure 100 for a bellows in a constant flow pump, comprising:

[0050] The pump head 110 has an inlet 110a and an outlet 110b. The pump head 110 is provided with an impact groove 110c, which is connected to the inlet 110a.

[0051] The bellows 120 has one end connected to the liquid inlet 110a and the liquid outlet 110b;

[0052] The driving component 130 is fixedly connected at one end to the end of the bellows 120 away from the pump head 110. A variable cavity 100d is formed between the bellows 120, the driving component 130 and the pump head 110. The axis of the impact groove 110c is arranged toward the variable cavity 100d so that when liquid is introduced, the liquid from the inlet 110a flushes the folds of the bellows 120 through the impact groove 110c.

[0053] Please refer to Figures 1-3 In this embodiment, during the process of liquid entering the pump head 110, the liquid first flows in through the inlet 110a and then enters the variable cavity 100d through the impact groove 110c provided inside the pump head 110. The axis of the impact groove 110c faces the internal pleated area of ​​the bellows 120. When the liquid flows through the impact groove 110c, it forms a directional liquid flow with a certain kinetic energy, which directly impacts the inner pleated surface of the bellows 120.

[0054] Through the action of the aforementioned impinging flow, the air bubbles in the pleated area are effectively disturbed and flushed during the liquid inlet process, and then enter the main body of the bellows 120 with the liquid. This directional flushing effect of the liquid significantly improves the liquid filling degree inside the bellows 120 and reduces the volume instability problem caused by residual air bubbles.

[0055] As the drive unit 130 drives the bellows 120 to reciprocate, during the liquid discharge process, due to the reduction of internal air bubbles, the effective variable volume of the bellows 120 becomes more stable and consistent, thereby achieving more stable and precise liquid output.

[0056] By setting the impact groove 110c and guiding the incoming fluid to directly flush the folded parts of the bellows 120, residual air bubbles in the dead corners of the structure can be effectively removed, preventing air bubble accumulation or retention, thereby achieving full filling of the bellows 120 cavity. The air bubble removal structure reduces air bubble interference, making the liquid discharge volume generated by each deformation of the bellows 120 more consistent, effectively improving the output accuracy of the constant flow pump.

[0057] Specifically, the structure includes a pump head 110, a bellows 120, and a drive unit 130. The pump head 110 has an inlet 110a and an outlet 110b, and an impact groove 110c is provided at the location communicating with the inlet 110a. One end of the bellows 120 is connected to the pump head 110, and the other end is connected to the drive unit 130. The drive unit 130 drives the bellows 120 to reciprocate, thereby achieving the intake and discharge of liquid. Structurally, the bellows 120, the pump head 110, and the drive unit 130 together form a variable cavity 100d, which serves as the liquid transport space.

[0058] It should be noted that the pump head 110 is roughly T-shaped, the inlet 110a and outlet 110b are both circular holes, the impact groove 110c is roughly a rectangular through groove, and the drive component 130 is an output shaft that is externally connected to a motor.

[0059] In at least one embodiment of this application, the pump head 110 is provided with a connecting portion 111, the connecting portion 111 is partially housed within the bellows 120, and the impact groove 110c is formed on the peripheral wall of the connecting portion 111 and located within the variable cavity 100d.

[0060] Please refer to Figures 1-3 In this embodiment, during the liquid inlet phase of the constant flow pump operation, the liquid enters the pump head 110 through the inlet 110a and is introduced into the variable cavity 100d through the impact groove 110c opened in the connecting part 111. Since the impact groove 110c is provided on the peripheral wall of the connecting part 111 and this part extends into the interior of the bellows 120, when the liquid is ejected from the impact groove 110c, its direction is closer to the folded area of ​​the bellows 120, thereby achieving targeted flushing of the inner wall of the folds.

[0061] The impact groove 110c and the corrugated pipe 120 are arranged in close proximity, which effectively enhances the flow disturbance effect on the dead corner inside the corrugated pipe 120 when the liquid flows in, making it easier for the liquid to fill the area that is originally prone to accumulating air bubbles.

[0062] As the bellows 120 periodically compresses and stretches, the flushed air bubbles are discharged from the pump chamber, resulting in a more uniform and continuous flow output in the subsequent liquid discharge process.

[0063] The impact groove 110c is directly set on the peripheral wall of the connecting part 111 that extends into the bellows 120, so that the impact liquid flow is closer to the pleated area of ​​the bellows 120, increasing the impact coverage of the liquid flow on the bubbles, thereby more effectively flushing away residual bubbles, especially in the area where gas is easily trapped deep in the pleats.

[0064] Because the impact flow is ejected near the folds, the liquid can fill the structural gaps of the bellows 120 more fully and quickly, reducing dead zones in liquid filling, improving the actual utilization rate of the bellows 120 cavity, and helping to improve the effective discharge volume during each pumping.

[0065] Reducing the volume uncertainty caused by air bubbles in the bellows 120 makes the deformation response of the bellows 120 more linear and stable, the output liquid flow rate more constant, and significantly improves the working reliability and metering accuracy of the constant flow pump.

[0066] The connecting part 111 is roughly cylindrical.

[0067] In at least one embodiment of this application, the impact groove 110c extends through the connecting portion 111 along a direction perpendicular to the axis of the connecting portion 111.

[0068] Please refer to Figures 1-3 In this embodiment, the connecting part 111 is a structure that extends from the pump head 110 into the bellows 120, and its axial direction is usually consistent with the mainstream direction of the liquid (i.e., flowing in from the inlet 110a); the impact groove 110c is set to be perpendicular to this axis, that is, the impact groove 110c is opened laterally from the peripheral wall on one side of the connecting part 111 and extends to the opposite side to form a radial through channel.

[0069] After the liquid enters the pump head 110 through the inlet 110a, it is guided to the impact groove 110c through the inlet channel 100e. When the liquid flows through the impact groove 110c, it can enter the variable cavity 100d of the bellows 120 from multiple directions at the same time because it passes through the connecting part 111 laterally. After the liquid is ejected from the impact groove 110c, because its spray direction is laterally relative to the axis of the connecting part 111, it can more directly and fully flush the inner wall of the bellows 120 folds, especially the dead corner areas of the folds on both sides and the bottom. During the liquid inlet process, the bellows 120 is constantly disturbed by the lateral liquid flow from the impact groove 110c, and the residual air bubbles are dispersed and squeezed out, effectively avoiding the problem of air bubble accumulation in the traditional structure.

[0070] In traditional axial impact grooves 110c, the jet flow is concentrated at the front, which can easily create dead zones for the liquid. In this design, the transversely penetrating impact grooves 110c allow the liquid flow to diffuse in a divergent manner within the variable cavity 100d, which can cover the interior of the bellows 120 more extensively, improve the flushing ability of each corner of the folds, and help to thoroughly disturb and remove residual air bubbles, especially those deep within multiple folds.

[0071] The liquid is ejected laterally, which makes it easier to diffuse inside the cavity, enabling rapid filling and liquid surface spreading, reducing the filling blind zone, and improving the liquid filling saturation of the entire 120-cavity bellows, thus making the subsequent drainage process more stable.

[0072] Reducing the effective volume change caused by air bubbles makes the discharge volume of the bellows 120 more consistent with each drive deformation, which helps the constant flow pump achieve higher flow accuracy and long-term stable operation.

[0073] In at least one embodiment of this application, the width of the impact groove 110c is denoted as a, and satisfies the relationship: 0.5mm < a < 1.5mm.

[0074] Please refer to Figures 1-3In this embodiment, liquid enters pump head 110 through inlet 110a and flows to impact groove 110c under the guidance of internal flow channel. The opening width (a value) of impact groove 110c determines the volumetric flow rate and jet characteristics of liquid per unit time. If the width is appropriate, liquid can form a stream with a certain velocity and pressure. After the stream is ejected from impact groove 110c, it enters the variable cavity 100d of bellows 120 in a directional manner and specifically flushes the folded area. Through impact groove 110c of appropriate width, fluid kinetic energy is effectively released, which can violently disturb the liquid-bubble interface without damaging bellows 120, promoting bubble peeling and discharge. Finally, bellows 120 completes the liquid discharge action under reciprocating drive. The bubbles that have been sufficiently disturbed before are basically removed, ensuring the volume stability of each liquid discharge.

[0075] By controlling the width of the impact tank 110c within the range of 0.5mm to 1.5mm, sufficient flow velocity (for rinsing wrinkles) and reasonable flow rate (to avoid insufficient or excessive spraying) can be achieved. If the width is too small (e.g., <0.5mm), although the liquid flow velocity is high, the flow rate is insufficient, the spraying force is weakened, and it may not be able to fully disturb the bubbles. If the width is too large (e.g., >1.5mm), the liquid flow spreads too quickly, the flow velocity decreases, the impact force is insufficient, or backflow dead zones appear, which also affect the rinsing effect.

[0076] A suitable groove width ensures that the jet forms a directional and controllable fluid path inside the bellows 120; improves the spreading efficiency of liquid in complex geometries, makes it easier for the folds to be covered by liquid, increases the filling saturation, helps to complete effective filling in a short time, improves the consistency and linear response of the bellows 120 drainage, and enhances the stability and repeatability of constant flow output.

[0077] In at least one embodiment of this application, the pump head 110 has an inlet channel 100e communicating with the inlet port 110a and a first connecting hole 110f, and the inlet channel 100e is connected to the variable cavity 100d;

[0078] The degassing structure 100 of the bellows in the constant flow pump also includes:

[0079] A pressure plate 140 is fixed to one end of the pump head 110 near the drive member 130;

[0080] The first one-way valve assembly is located in the liquid inlet channel 100e, with one end fixed to the pressure plate 140 and the other end used to block or open the first connecting hole 110f, so that the liquid inlet 110a is isolated from or connected to the liquid inlet channel 100e through the first connecting hole 110f.

[0081] Please refer to Figures 1-3In this embodiment, during the liquid inlet stage (winding of the bellows 120): as the driving member 130 stretches the bellows 120, a negative pressure is formed inside the bellows 120. At this time, the first one-way valve group opens under the action of the pressure difference, and the first connecting hole 110f connects the liquid inlet 110a and the liquid inlet channel 100e. The liquid enters the liquid inlet channel 100e from the liquid inlet 110a and then flows to the variable cavity 100d of the bellows 120, completing the liquid inlet. At the same time, since the liquid inlet path is provided with an impact groove 110c, the liquid effectively flushes the wrinkled area when entering the variable cavity 100d, achieving the purpose of removing air bubbles.

[0082] Discharge stage (compression of bellows 120): The drive unit 130 pushes the bellows 120 to compress, the internal pressure increases, the first one-way valve group is automatically closed by the reverse pressure, blocking the first connecting hole 110f, preventing the liquid from flowing back to the inlet 110a, and ensuring that the liquid can only be discharged from the outlet 110b. This process realizes fluid direction control and ensures flow stability and output consistency.

[0083] The first one-way valve group ensures that liquid can only flow in from the inlet 110a during the liquid inlet stage and automatically closes during the liquid outlet stage. This effectively prevents liquid inside the bellows 120 from flowing back towards the inlet 110a, avoids liquid pulsation or backflow causing discontinuous liquid inlet, and ensures the continuity and accuracy of constant flow output.

[0084] Based on the liquid inlet channel 100e connected to the impact tank 110c, the liquid is guided to flow into the bellows 120 in a directional manner. In each liquid inlet cycle, due to the stable and clear liquid flow path controlled by the one-way valve, the impact tank 110c can always effectively play a flushing role, improving the liquid coverage and bubble disturbance efficiency of the folded parts.

[0085] The one-way valve automatically closes when the liquid flows in the opposite direction, forming an effective seal to prevent outside air from entering the pump chamber and reduce the uncertainty of bellows deformation caused by gas mixing, thereby improving the constant flow accuracy and equipment operation stability.

[0086] The liquid inlet channel 100e is located inside the pump head 110 and connects the liquid inlet 110a with the variable cavity 100d formed by the bellows 120. It is the main channel for liquid to enter the bellows 120. The first connecting hole 110f is located between the liquid inlet channel 100e and the liquid inlet 110a and can control whether liquid enters the liquid inlet channel 100e from the liquid inlet 110a. The pressure plate 140 is installed at one end of the pump head 110 near the drive member 130 and serves to fix the structure and support the first one-way valve assembly. The first one-way valve assembly is located in the liquid inlet channel 100e and is fixedly connected to the pressure plate 140. One end of the valve assembly can block or open the first connecting hole 110f.

[0087] In at least one embodiment of this application, the first check valve assembly includes:

[0088] The first elastic element 151 is fixed at one end to the pressure plate 140;

[0089] The first ball valve 152 is fixedly connected to the end of the first elastic member 151 away from the pressure plate 140, and is used to block or open the first connecting hole 110f.

[0090] Please refer to Figures 1-3 In this embodiment, during the liquid inlet stage (winding of bellows 120), the drive member 130 pulls the bellows 120 to form a negative pressure. Under the action of the pressure difference, the liquid at the inlet 110a enters the inlet channel 100e. This negative pressure acts on the first ball valve 152, causing the first ball valve 152 to be pulled (or pushed open by the liquid), that is, overcoming the restoring force of the first elastic member 151, causing the first ball valve 152 to leave the first connecting hole 110f. The first connecting hole 110f opens, and the liquid enters the variable cavity 100d of the bellows 120 through the inlet channel 100e.

[0091] During the drainage stage (compression of bellows 120), bellows 120 is compressed by drive component 130, and the internal pressure increases. At this time, the liquid tends to move in the direction of backflow. However, the first ball valve 152 automatically returns to its original position under the combined action of the restoring force of the first elastic component 151 and the back pressure, blocking the first connecting hole 110f and preventing the liquid from flowing back to the inlet 110a, thus realizing the one-way valve function.

[0092] This process is automatically repeated in each pumping cycle, always maintaining the consistency of the liquid's inflow and outflow direction.

[0093] The first ball valve 152, together with the first elastic element 151, constitutes a passive fluid control system, which only allows liquid to enter from the inlet 110a under specific pressure conditions. When draining, it automatically seals the first connecting hole 110f, effectively preventing liquid backflow and ensuring stable flow.

[0094] During the liquid inlet phase, the ball valve opens promptly to ensure sufficient liquid inlet. During the liquid outlet phase, the ball valve seals tightly to eliminate reverse fluctuations. This ensures that the liquid volume output is more constant in each pumping cycle, improving the linearity and repeatability of the constant flow pump output.

[0095] The first elastic element 151 is a spring or other elastic member with restoring force, and one end is fixed to the pressure plate 140. The first ball valve 152 is located at the end of the elastic element away from the pressure plate 140, within the liquid inlet channel 100e, and can move under the action of the elastic element. The first ball valve 152 is approximately spherical. The first connecting hole 110f is located directly below (or in front of) the ball valve and is the channel opening between the liquid inlet 110a and the liquid inlet channel 100e. The first connecting hole 110f is a circular through hole 170a. The pressure plate 140 provides a fixed support structure and serves as the positioning base for the valve assembly. The pressure plate 140 is approximately plate-shaped, and the cross-sectional area of ​​the pressure plate 140 is smaller than the maximum diameter of the variable cavity 100d.

[0096] The first elastic element 151 is fixed to the side of the pressure plate 140 away from the driving element 130, and the second elastic element 161 is fixed to the side of the connecting element 170 close to the driving element 130.

[0097] In at least one embodiment of this application, the pressure plate 140 is provided with a second communicating hole 140a, the pump head 110 is provided with a liquid outlet channel 100g communicating with the liquid outlet 110b, and the second communicating hole 140a is communicating with the variable cavity 100d.

[0098] The degassing structure 100 of the bellows in the constant flow pump also includes:

[0099] The second one-way valve assembly is located in the liquid outlet channel 100g, with one end fixed to the pressure plate 140 and the other end used to block or open the second connecting hole 140a, so that the second connecting hole 140a is isolated from or connected to the liquid outlet channel 100g.

[0100] Please refer to Figures 1-3 In this embodiment, during the liquid inlet stage (corrugated pipe 120 is stretched), the drive member 130 drives the corrugated pipe 120 to stretch, and a negative pressure is formed inside the corrugated pipe 120. At this time, liquid enters the corrugated pipe 120 from the liquid inlet 110a. Since the internal pressure is lower than the external pressure, the second one-way valve group automatically closes under the pressure, sealing the second connecting hole 140a, preventing external liquid or air from flowing back into the corrugated pipe 120, and ensuring that the liquid inlet flow direction is unique and stable.

[0101] During the drainage stage (compression of bellows 120), the drive unit 130 pushes the bellows 120 to compress, increasing the pressure inside the variable cavity 100d. Under pressure, the liquid flows to the second connecting hole 140a and pushes the valve body of the second one-way valve group to open. The second connecting hole 140a connects to the outlet channel 100g, and the liquid is smoothly discharged from inside the bellows 120 and guided to the outside through the outlet 110b. The second one-way valve automatically adjusts the opening / closing state to achieve one-way flow control during liquid discharge.

[0102] The matching structure of the second one-way valve assembly and the second connecting hole 140a ensures that the liquid can only be discharged from the outlet 110b when the bellows 120 is compressed, avoiding the liquid from entering the inlet path or pump chamber in reverse during the discharge stage, thus ensuring the stability of the fluid control process.

[0103] The first check valve group controls the unidirectional flow of liquid inlet, and the second check valve group controls the unidirectional flow of liquid outlet. Together, they create a closed, directional, and stable fluid transport path, which can significantly improve the delivery accuracy, response speed, and operational reliability of the constant flow pump.

[0104] The second connecting hole 140a is opened on the pressure plate 140 and connected to the variable cavity 100d formed inside the bellows 120. It is used to discharge the pressurized liquid. The second connecting hole 140a is a circular through hole 170a. The liquid outlet channel 100g is located inside the pump head 110 and is connected to the liquid outlet 110b. It serves as the path for the liquid to flow from the pump body to the outside. The liquid outlet channel 100g is a circular channel. The second one-way valve group is located in the liquid outlet channel 100g. One end of the valve is fixed on the pressure plate 140 and the other end is located inside the liquid outlet channel 100g. It can automatically block or open the second connecting hole 140a.

[0105] In at least one embodiment of this application, the second check valve assembly includes:

[0106] The second elastic element 161 is fixed at one end to the pump head 110;

[0107] The second ball valve 162 is located at one end of the second elastic member 161 near the pressure plate 140.

[0108] In at least one embodiment of this application, the first check valve assembly is in the opposite direction to the second check valve assembly.

[0109] Please refer to Figures 1-3 In this embodiment, during the liquid inlet stage (bellows 120 is stretched), the bellows 120 is stretched by the drive member 130, forming a negative pressure. The first one-way valve group opens, and the liquid flows into the bellows 120 from the inlet 110a through the first connecting hole 110f. Due to the low pressure inside the cavity, the second one-way valve group remains closed under the push of the second elastic member 161, preventing the liquid or gas in the outlet channel 100g from flowing back into the pump cavity. During this stage, the liquid flows in only one direction, and the air bubbles are disturbed by the impact liquid flow, effectively entering the cavity to prepare for discharge with the liquid.

[0110] During the drainage stage (compression of bellows 120), the bellows 120 is compressed, the internal pressure rises, and the first one-way valve group automatically closes to prevent liquid from flowing back to the inlet 110a. At this time, the internal pressure of the bellows 120 pushes the second ball valve 162 to open against the elastic force of the second elastic element 161, the second connecting hole 140a opens, and the liquid flows to the outlet 110b. The disturbed air bubbles are discharged from the outlet path along with the liquid, forming a stable and directional drainage action.

[0111] The first and second one-way valve groups operate in opposite directions, controlling the opening and closing of the inlet and outlet paths respectively. This ensures that the fluid flow process is free from cross-flow and backflow, significantly improving the delivery accuracy of the constant flow pump and the reliability of the liquid path control.

[0112] The second elastic element 161 provides the return force for the second ball valve 162. The opening and closing of the valve depends entirely on the pressure change inside the pump chamber and does not require external drive.

[0113] The second ball valve 162 opens only during the drainage stage, effectively guiding air bubbles through the outlet channel 100g and out with the liquid, preventing air bubbles from accumulating in the pump chamber, which helps improve the degassing efficiency and thus enhances the stability and output consistency of the constant flow pump.

[0114] The second elastic element 161 is a component with elastic recovery capability (such as a spring) used to provide continuous return force; the second ball valve 162 is fixed to one end of the second elastic element 161 near the pressure plate 140, and can realize the opening or closing of the second connecting hole 140a under the action of the elastic element. The second ball valve 162 is roughly spherical.

[0115] In at least one embodiment of this application, the degassing structure 100 of the bellows in the constant flow pump further includes:

[0116] A connecting member 170 is disposed within the liquid outlet channel 100g and abuts against the pump head 110. The second elastic member 161 abuts against the connecting member 170. The connecting member 170 has a through hole 170a, which connects the liquid outlet 110b and the liquid outlet channel 100g.

[0117] Please refer to Figures 1-3 In this embodiment, the driving member 130 compresses the bellows 120, causing the pressure inside the cavity to rise. The liquid pushes the second ball valve 162 to overcome the elastic force of the second elastic member 161, thereby opening the second connecting hole 140a. The liquid flows out from inside the bellows 120, passes through the second connecting hole 140a on the pressure plate 140, enters the liquid outlet channel 100g, and is then guided to the final liquid outlet 110b through the through hole 170a of the connecting member 170. The connecting member 170 acts as a bridging structure for the liquid outlet, achieving stable guidance of the flow path.

[0118] It should be noted that the connecting component 170 is roughly cylindrical.

[0119] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A degassing structure for a bellows in a constant flow pump, characterized in that, include: A pump head has an inlet and an outlet, and the pump head is provided with an impact groove, which is connected to the inlet. A bellows, one end of which is connected to the liquid inlet and the liquid outlet; A drive unit is fixedly connected at one end to the end of the bellows away from the pump head. A variable cavity is formed between the bellows, the drive unit, and the pump head. The axis of the impact groove is oriented toward the variable cavity so that when liquid is introduced, the liquid at the inlet flushes the folds of the bellows through the impact groove.

2. The degassing structure of the bellows in the constant flow pump according to claim 1, characterized in that, The pump head is provided with a connecting part, which is partially housed inside the bellows. The impact groove is formed on the peripheral wall of the connecting part and is located inside the variable cavity.

3. The degassing structure of the bellows in the constant flow pump according to claim 2, characterized in that, The impact groove extends through the connecting part along an axis perpendicular to the connecting part.

4. The degassing structure of the bellows in the constant flow pump according to claim 1, characterized in that, The width of the impact groove is denoted as a, and satisfies the relationship: 0.5mm < a < 1.5mm.

5. The degassing structure of the bellows in the constant flow pump according to claim 1, characterized in that, The pump head has an inlet channel and a first connecting hole that communicate with the inlet port, and the inlet channel is connected to the variable cavity; The degassing structure of the bellows in the constant flow pump also includes: A pressure plate is fixed to one end of the pump head near the drive component; The first one-way valve assembly is located in the liquid inlet channel, with one end fixed to the pressure plate and the other end blocking or opening the first connecting hole so that the liquid inlet is isolated from or connected to the liquid inlet channel through the first connecting hole.

6. The degassing structure of the bellows in the constant flow pump according to claim 5, characterized in that, The first check valve assembly includes: The first elastic element is fixed at one end to the pressure plate; The first ball valve is fixedly connected to the end of the first elastic element away from the pressure plate and is used to block or open the first connecting hole.

7. The degassing structure of the bellows in the constant flow pump according to claim 5, characterized in that, The pressure plate has a second connecting hole, the pump head has a liquid outlet channel communicating with the liquid outlet, and the second connecting hole is communicating with the variable cavity; The degassing structure of the bellows in the constant flow pump also includes: The second one-way valve assembly is located in the liquid outlet channel. One end is fixed to the pressure plate, and the other end blocks or opens the second connecting hole so that the second connecting hole is isolated from or connected to the liquid outlet channel.

8. The degassing structure of the bellows in the constant flow pump according to claim 7, characterized in that, The second check valve assembly includes: The second elastic element is fixed at one end to the pump head; The second ball valve is located at one end of the second elastic element near the pressure plate.

9. The degassing structure of the bellows in the constant flow pump according to claim 7, characterized in that, The first check valve assembly is in the opposite direction to the second check valve assembly.

10. The degassing structure of the bellows in the constant flow pump according to claim 8, characterized in that, The degassing structure of the bellows in the constant flow pump also includes: A connecting member is disposed within the liquid outlet channel and abuts against the pump head. The second elastic member abuts against the connecting member. The connecting member has a through hole that connects the liquid outlet and the liquid outlet channel.

Images