Multifunctional microvalve capable of controlling flow of fluid, microfluidic chip and method

A microfluidic chip, comprising:

• a substrate and a cover plate, wherein
• the substrate is provided with a first liquid storage recess, a second liquid storage recess, and a microvalve insertion hole,
• a first microchannel is disposed in the substrate, wherein the microvalve insertion hole interrupts the first microchannel into a first microchannel segment proximal to the first liquid storage recess and a second microchannel segment distal to the first liquid storage recess,
• a second microchannel is disposed in the substrate,
• a third microchannel is disposed in the substrate,
• a microvalve is located in the microvalve insertion hole, wherein the microvalve comprises a valve body, a first flow guide channel, and a second flow guide channel, and wherein the first and second flow guide channels do not fluidly communicate with each other,
• wherein
• the first microchannel segment of the first microchannel comprises a first end directly fluidly connected with the first liquid storage recess a second end directly fluidly connected with the microvalve insertion hole, and the second microchannel segment of the first microchannel comprises a third end directly fluidly connected with the microvalve insertion hole, and a fourth end fluidly connected to a first end of the second microchannel,
• the second microchannel comprises a second end directly fluidly connected with the second liquid storage recess,
• the third microchannel comprises a first end directly fluidly connected with the second liquid storage recess and a second end of the third microchannel is directly fluidly connected with the microvalve insertion hole,
• the microvalve is configured and arranged such that the rotational position of the first flow guide channel regulates fluid communication between the first liquid storage recess and the fourth end of the first microchannel, the rotational position of the second flow guide channel regulates fluid communication between the second liquid storage recess and the ambient atmosphere via the third microchannel, and the fourth end of the first microchannel is fluidly connected to the second storage recess via the second microchannel irrespective of the rotational position of the microvalve.