Negative pressure generating device, method and ink-jet printer

Abstract

An embodiment of the present invention discloses a subpressure generating device. In order to solve the problem that the prior subpressure generating device can not produce lower stable subpressure and does not have better capacity of resisting disturbance at the same time. The device is provided with a vacuum pump (1), a pumping end of which is connected with a first flow rate adjusting device (5), another end of which is connected with an air outlet end (61) of a tee junction (6), and a port (62) of the tee junction (6) is connected with an ink cartridge (12), and an air inlet end (63) of the tee junction (6) is connected with atmosphere (4). Because the flow rate adjusting device (5) has certain function of resisting towards the undulation of a pumping velocity of the vacuum pump (1), and the pumping function of the air outlet end (61) inside the tee junction (6) and the air entering function of the air inlet end (63) have certain self-regulating ability towards the air pressure of the port (62), the device can produce lower stable subpressure and at the same time has better capacity of resisting disturbance.

Description

technical field [0001] The invention belongs to the field of gas pressure control, and in particular relates to a negative pressure generating device, method and inkjet printing machine. Background technique [0002] In practical applications in the field of gas pressure control, it is often necessary to generate a stable low-value negative pressure in a closed system. The volume of gas in a closed system may change, resulting in a change in gas pressure. At this time, it is hoped that the negative pressure generation method and device can effectively resist such changes. Ensure that the negative pressure value is maintained within a reasonable range during the change process. [0003] In inkjet printing technology, in order to prevent the ink in the nozzle from flowing out of the nozzle by itself, it is hoped that the air pressure in the ink cartridge above the nozzle is lower than the atmospheric pressure, that is, a negative pressure is formed in the ink cartridge. App...

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Problems solved by technology

[0007] In order to solve the problem that the existing negative pressure generating device cannot generate stable and low negative pressure while having strong anti-interference ability, the embodiment of the present invention provides a negative pressure generating device, which is installed at the suction end of the vacuum pump 1 Connected with a first flow regulating device 5, the other end of the first flow regulating device 5 is connected with the outlet end 61 of a three-way joint 6, the port 62 of the three-way joint 6 is connected with the ink cartridge 12, the air inlet of the three-way joint 6 The end 63 is connected to the atmosphere 4, and the negative pressure of the ink cartridge 12 is adjusted by adjusting the first flow regulating device 5

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