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CN-224228828-U - Bubble removing structure of bellows in constant flow pump

CN224228828UCN 224228828 UCN224228828 UCN 224228828UCN-224228828-U

Abstract

The application provides a bubble removing structure of a bellows in a constant flow pump, wherein in the process of liquid entering a pump head, the liquid firstly flows in through a liquid inlet and enters a variable cavity through an impact groove arranged in the pump head. The axis of the impingement slot is oriented toward the inner corrugated region of the bellows, and the liquid, when flowing through the impingement slot, forms a directional flow of liquid having a certain kinetic energy that directly impinges upon the corrugated inner surface of the bellows. Through the effect of the impact flow, bubbles in the fold area are effectively disturbed and flushed in the liquid feeding process and enter the main body part of the corrugated pipe along with the liquid. The directional flushing effect of the liquid remarkably improves the filling degree of the liquid in the corrugated pipe, and reduces the problem of unstable volume caused by residual bubbles. Through setting up the impact groove and leading into liquid fluid direct flushing bellows fold position, can effectively clear away the residual bubble in the structure dead angle, avoid the bubble to pile up or be detained to realize the abundant filling of bellows cavity.

Inventors

  • LU JUN
  • XIONG ZHIHUA

Assignees

  • 深圳市益思精密五金有限公司

Dates

Publication Date
20260512
Application Date
20250724

Claims (10)

  1. 1. The utility model provides a bubble removal structure of bellows in constant flow pump which characterized in that includes: The pump head is provided with a liquid inlet and a liquid outlet, and is provided with an impact groove which is communicated with the liquid inlet; one end of the corrugated pipe is communicated with the liquid inlet and the liquid outlet; One end of the driving piece is fixedly connected with one end of the corrugated pipe, which is far away from the pump head, a variable cavity is formed by surrounding the corrugated pipe, the driving piece and the pump head, and the axis of the impact groove faces to the variable cavity, so that when liquid is fed, liquid at the liquid inlet is flushed at the fold of the corrugated pipe through the impact groove.
  2. 2. The bubble removal structure of bellows in a constant flow pump according to claim 1, wherein the pump head is provided with a connecting portion, the connecting portion is partially accommodated in the bellows, and the impact groove is formed in a peripheral wall of the connecting portion and is located in the variable cavity.
  3. 3. The bubble removal structure of bellows in a constant flow pump according to claim 2, wherein the impingement slot penetrates the connection portion in a direction perpendicular to an axis of the connection portion.
  4. 4. The bubble removal structure of bellows in a constant flow pump according to claim 1, wherein the width of the impact groove is denoted as a, satisfying the relation 0.5mm < a <1.5mm.
  5. 5. The bubble removal structure of a bellows in a constant flow pump according to claim 1, wherein the pump head is provided with a liquid inlet channel and a first communication hole which are communicated with the liquid inlet, and the liquid inlet channel is communicated with the variable cavity; bubble removing structure of bellows in the constant flow pump still includes: The pressing plate is fixed at one end of the pump head, which is close to the driving piece; The first one-way valve group is arranged in the liquid inlet channel, one end of the first one-way valve group is fixed on the pressing plate, and the other end of the first one-way valve group is used for plugging or opening the first communication hole so that the liquid inlet is isolated from or communicated with the liquid inlet channel through the first communication hole.
  6. 6. The bubble removal structure for a bellows in a constant flow pump of claim 5, wherein the first check valve set comprises: one end of the first elastic piece is fixed on the pressing plate; The first ball valve is fixedly connected with one end, far away from the pressing plate, of the first elastic piece and used for plugging or opening the first communication hole.
  7. 7. The bubble removing structure of the bellows in the constant flow pump according to claim 5, wherein a second communication hole is formed in the pressing plate, a liquid outlet channel communicated with the liquid outlet is formed in the pump head, and the second communication hole is communicated with the variable cavity; bubble removing structure of bellows in the constant flow pump still includes: The second one-way valve group is arranged in the liquid outlet channel, one end of the second one-way valve group is fixed on the pressing plate, and the other end of the second one-way valve group is used for plugging or opening the second communication hole so that the second communication hole is isolated from or communicated with the liquid outlet channel.
  8. 8. The bubble removal structure for a bellows in a constant flow pump of claim 7, wherein the second check valve set comprises: one end of the second elastic piece is fixed on the pump head; and the second ball valve is arranged at one end of the second elastic piece, which is close to the pressing plate.
  9. 9. The bubble removal structure for a bellows in a constant flow pump of claim 7, wherein the first one-way valve set is opposite to the second one-way valve set.
  10. 10. The bubble removal structure for a bellows in a constant flow pump according to claim 8, further comprising: The communicating piece is arranged in the liquid outlet channel and is in butt joint with the pump head, the second elastic piece is in butt joint with the communicating piece, the communicating piece is provided with a through hole, and the through hole is communicated with the liquid outlet and the liquid outlet channel.

Description

Bubble removing structure of bellows in constant flow pump Technical Field The application relates to the field of constant flow pumps, in particular to a bubble removing structure of a bellows in a constant flow pump. Background A constant flow pump (also known as a constant flow pump) is a pump capable of outputting a stable flow rate, which keeps the liquid flow rate constant regardless of back pressure or load variation. It is widely used in situations where precise liquid delivery and flow control is required. For example, infusion in medical treatment, hemodialysis, fine chemical addition in chemical industry, etc. In some constant flow pumps (such as bellows pumps and diaphragm pumps), the bellows serves as a liquid cavity with variable volume, so that the bellows serves as a liquid conveying element, and conveying of small-flow liquid can be accurately controlled through compression and stretching of each section of the bellows, so that conveying flow is more accurate. The existing corrugated pipe utilizes the corrugated shape, and the volume of a cavity is changed by compressing or stretching the corrugated pipe, so that the one-way valve pipeline is increased for vacuum liquid feeding (when the volume is increased) and liquid discharging (when the volume is reduced), and the effect of accurately conveying liquid is achieved. However, due to the limitation of the liquid inlet hole and the liquid outlet hole, a part of air remains in the hollow corrugated pipe, so that part of air exists at the position of the fold, the liquid is difficult to completely fill the whole corrugated pipe in the using process, local bubbles exist in the corrugated pipe, the corrugated pipe is compressed to discharge liquid in the process, the volume change in the corrugated pipe is unstable due to the existence of the bubbles, the liquid discharge amount is changed greatly, and the output precision of the constant flow pump is finally affected. Disclosure of utility model In view of the foregoing, it is desirable to provide a bubble removal structure for bellows in a constant flow pump to solve the above-mentioned problems. The embodiment of the application provides a bubble removing structure of a corrugated pipe in a constant flow pump, which comprises the following components: The pump head is provided with a liquid inlet and a liquid outlet, and is provided with an impact groove which is communicated with the liquid inlet; one end of the corrugated pipe is communicated with the liquid inlet and the liquid outlet; One end of the driving piece is fixedly connected with one end of the corrugated pipe, which is far away from the pump head, a variable cavity is formed by surrounding the corrugated pipe, the driving piece and the pump head, and the axis of the impact groove faces to the variable cavity, so that when liquid is fed, liquid at the liquid inlet is flushed at the fold of the corrugated pipe through the impact groove. In at least one embodiment of the present application, the pump head is provided with a connecting portion, the connecting portion is partially accommodated in the corrugated tube, and the impact groove is formed in a peripheral wall of the connecting portion and is located in the variable cavity. In at least one embodiment of the application, the impingement slot extends through the connection in a direction perpendicular to the axis of the connection. In at least one embodiment of the present application, the width of the impingement slot is denoted as a, satisfying the relationship 0.5mm < a <1.5mm. In at least one embodiment of the present application, the pump head is provided with a liquid inlet channel and a first communication hole, wherein the liquid inlet channel is communicated with the variable cavity; bubble removing structure of bellows in the constant flow pump still includes: The pressing plate is fixed at one end of the pump head, which is close to the driving piece; The first one-way valve group is arranged in the liquid inlet channel, one end of the first one-way valve group is fixed on the pressing plate, and the other end of the first one-way valve group is used for plugging or opening the first communication hole so that the liquid inlet is isolated from or communicated with the liquid inlet channel through the first communication hole. In at least one embodiment of the present application, the first check valve set includes: one end of the first elastic piece is fixed on the pressing plate; The first ball valve is fixedly connected with one end, far away from the pressing plate, of the first elastic piece and used for plugging or opening the first communication hole. In at least one embodiment of the present application, a second communication hole is formed in the pressure plate, the pump head is provided with a liquid outlet channel communicated with the liquid outlet, and the second communication hole is communicated with the variable cavity; bubble removing structure of b