초록 ▼

A fluid mixer is provided which can supply a fixed amount of fluid in each of supply lines to a mixing line all the time while maintaining a highly accurate mixing ratio even if a pressure on the downstream side of a back pressure valve of the mixing line is fluctuated and moreover can change the mi

A fluid mixer is provided which can supply a fixed amount of fluid in each of supply lines to a mixing line all the time while maintaining a highly accurate mixing ratio even if a pressure on the downstream side of a back pressure valve of the mixing line is fluctuated and moreover can change the mixing ratio of the fluids in the supply lines with high accuracy in the state where the fluids are flowed. On the upstream side from a merging point where at least two supply lines: a first supply line and a second supply line are merged to a mixing line, diaphragm parts for adjusting the flow rates of the fluids and pressure reducing valves are arranged on the further upstream side of the diaphragm parts in series with the supply lines and a back pressure valve is arranged in the mixing line. Also, the back pressure valve and a flow meter are arranged in series in the mixing line, a fixed orifice or an regulating valve is used for the diaphragm parts and the pressure reducing valves and the back pressure valve are automatic valves.

대표청구항 ▼

What is claimed is: 1. A liquid mixer comprising pumps for pressure feeding liquids flowing through at least two supply lines to a mixing line at an arbitrary ratio, each supply line comprising a diaphragm, selected from the group consisting of a needle valve, a fixed orifice, and a regulating valv

What is claimed is: 1. A liquid mixer comprising pumps for pressure feeding liquids flowing through at least two supply lines to a mixing line at an arbitrary ratio, each supply line comprising a diaphragm, selected from the group consisting of a needle valve, a fixed orifice, and a regulating valve, for adjusting the flow rate of the liquids provided on the upstream side from a point where said at least two supply lines are merged to the mixing line and a pressure reducing valve comprising an automatic valve and being positioned further upstream of said diaphragm and in series therewith, and a back pressure valve comprising an automatic valve, fluctuations of the pressure in the liquids on the downstream side of the back pressure valve being absorbed in said mixing line. 2. The liquid mixer of claim 1, further comprising a flow meter, wherein the back pressure valve and a flow meter are arranged in series in the mixing line. 3. A liquid mixer for pressure feeding liquids with pumps, comprising: at least two separate supply lines through which respective liquids flow at an arbitrary ratio, the supply lines merging at a merge point into a mixing line, each supply line having a diaphragm for adjusting the flow rate of the respective fluid and located upstream of the merge point, the diaphragm being selected from the group consisting of needle valves, fixed orifices, and regulating valves, a pressure reducing valve further upstream of the diaphragm and in series therewith, and a pump positioned upstream of the pressure reducing valve and in series therewith for pumping the respective liquid; a back pressure valve located immediately downstream of the merge point, the back pressure valve operating to absorb fluctuations in the liquid pressure in the mixing line downstream of the back pressure valve; and a flow meter positioned downstream of the back pressure valve and in series therewith, whereby, in operation, the liquid pressures of the at least two supply lines on the upstream side of the merge point is maintained constant. 4. The fluid mixer of claim 3, further comprising: a needle valve positioned downstream of the flow meter for regulating the output of the fluid mixer.