Automatic instillation device
A dripping and automatic technology, applied in the direction of non-electric variable control, flow control, instruments, etc., can solve the problems of not too much liquid storage, complex mechanical structure, unfavorable liquid medicine replacement, etc., to achieve reliable protection effect and improve reliability , Simple and reliable mechanical structure
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Embodiment 1
[0030] Such as figure 1 , figure 2 Among them, an automatic infusion device, including a pipeline 3, one end of the pipeline 3 is provided with a first adapter 2 for connecting with the liquid storage bag 1, and the other end is used for connecting with the infusion needle. There is a liquid supply device 5 that supplies liquid to the pipeline 3 in a variable volume manner, and a point pressure drive device 4 for driving the volume of the liquid supply device 5 to change.
[0031] In the liquid supply device 5, the housing 516 is provided with a flexible flap 511 to form a cavity with variable volume, and the flexible flap 511 is made of rubber or plastic.
[0032] A one-way valve is provided at both ends of the housing 516 . The flexible flap 511 is deformed by the point pressure driving device 4 , thereby changing the volume of the housing 516 , and under the action of the one-way valves at both ends, liquid droplets flowing to the infusion needle 6 are formed. This enab...
Embodiment 2
[0034] On the basis of Example 1, in the optimized scheme, such as image 3 As shown in , in the liquid supply device 5, the housing 516 is provided with a flexible flap 511 to form a cavity with variable volume. One end of the housing 516 is provided with a first one-way valve 513, and the other end is provided with a Safety check valve 514.
[0035] Such as Figure 4 In the above-mentioned safety one-way valve 514, the other side of the safety one-way valve spool is also provided with a safety valve seat 515 that cooperates with the one-way valve spool to form a blockage. On the basis of Embodiment 1, the provided safety valve seat 515 can avoid that the one-way valves at both ends of the liquid supply device 5 are always in a normally open state due to the pressure on the liquid storage bag 1 . When the fluid storage bag 1 is under pressure, the liquid closes between the valve core of the safety one-way valve 514 and the safety valve seat 515 to prevent the passage of the...
Embodiment 3
[0037] On the basis of Example 2, in the optimized scheme, such as Figure 5 As shown, in the liquid supply device 5 described above, the housing 516 is provided with a flexible flap 511 to form a cavity with a variable volume, and safety check valves 514 are provided at both ends of the housing 516 . In the safety one-way valve 514, the other side of the safety one-way valve spool is also provided with a safety valve seat 515 that cooperates with the one-way valve spool to form a block. With this structure, the safety is further improved, and the flexible flap 511 is prevented from being damaged due to excessive pressure. Moreover, the liquid supply device 5 can operate even under a pressure-bearing condition with a relatively small pressure. The details are as follows, when the liquid storage bag 1 is under pressure, the pressure of the liquid makes the valve core of the upper safety one-way valve 514 close with the safety valve seat 515. The spool of the valve 514 returns...
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