JPS6242362Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flow type conductivity cell used to detect the flow state of liquid flowing through a flexible pipe of an automatic milking machine for dairy cows.

In devices such as automatic milking machines that vacuum the inside of a pipe by reducing the pressure from the atmosphere, air bubbles are mixed into the liquid flowing inside the pipe in order to accurately measure conductivity using electrodes installed in the pipe. If you try to defoam the liquid by exposing it to the atmosphere, the atmosphere will be sucked in and the liquid will not be able to be sucked out.

The present invention can be easily used by being inserted into the middle of a depressurized flexible pipe, and the conductivity can be accurately measured in the depressurized flow path without air bubbles preventing the liquid from coming into contact with the electrode. The aim is to provide a flow-through type conductivity cell.

In order to achieve this purpose, the present invention includes an upper pipe, a lower pipe arranged with a space between the lower end of the upper pipe and the end faces facing each other, and a lower pipe arranged between the upper pipe and the lower end. a large-diameter part airtightly enclosed between the upper pipe and the lower pipe, a bypass with one end open between the upper pipe and the lower pipe, formed along the outer circumference of the lower pipe and closed at the other end, and a bypass with the other end closed. This is a flow-through type conductivity cell comprising an outlet formed by a pore provided so as to communicate between the end and the inside of the lower pipe, and an electrode provided exposed on the inner surface of the bypass.

FIG. 1 is a partially sectional perspective view of an embodiment of the present invention, in which a part of the pipe constituting the main flow path 1 is cut and separated vertically at intervals, and a large diameter section is formed from the lower end of the upper pipe 1a. 1d and separated part 1
A bypass 2 is formed between the large diameter portion 1d and the outer periphery of the lower pipe 1b to surround a part of the lower pipe, and the space between the lower end of the large diameter portion 1d and the lower pipe 1b is closed. The bypass 2 has an outlet 3 at its lower end through a small hole provided to communicate inside and outside the lower pipe 1b.
An electrode 4 is provided on the large diameter portion 1d so as to be exposed on the inner surface of the bypass 2. In this conductivity cell, the pipe 1a is placed above one horizontal line and the pipe 1d is placed below, and the liquid flows in the direction shown by the arrow.

In the embodiment shown in FIG. 2, the outer diameter of the lower pipe 1b within the large diameter portion 1d is formed so as to be in contact with the inner surface of the large diameter portion 1d, and a groove is provided from the end in the extending direction of the pipe 1b. A bypass 2 is formed by using the bypass 2, and the cross section of the bypass 2 is reduced to a fraction of the cross section of the main flow path 1.

When the specific conductivity of the liquid to be measured is small and you want to keep the cell constant small, the one shown in Figure 1 is advantageous.
When the specific conductivity of the liquid to be measured is large and a large cell constant is desired, it is advantageous to make the cross section of the bypass 2 smaller than that of the main channel 1, as shown in FIG.

In FIG. 2, there are two bypasses 2, but when a larger cell constant is desired, the bypass 2 may be made into one in order to further reduce the cross section.

In the conductivity cell of FIG. 2, as shown in FIGS. 3a and 3b, a passage 5 bent in an L-shape from the bypass 2 is provided near the outlet of the bypass 2, and an outlet 3 is provided there. When the liquid passes through the cell by suction, it has the effect of alleviating pressure fluctuations and preventing pressure fluctuations from affecting the liquid near the electrodes.

According to the present proposal, in Figures 1 to 3,
Most of the liquid flowing into the main channel 1 from above passes downward through the main channel 1, but some of it passes through the bypass 2.
flows to In the bypass 2, the outlet 3 to the main flow path 1 is smaller, so the flow velocity decreases and stagnates in the bypass 2. For this reason, bubbles that have entered the bypass 2 or generated bubbles are separated and escape upward. Therefore, it is possible to prevent air bubbles from stagnation in the pole 4 exposed in the bypass 2. Since the cell of this invention has a sealed bypass along the side of the main flow channel as one unit, it can be easily inserted into the middle of the hose of the vacuum flow channel, allowing liquids flowing through the flow channel that may contain air bubbles to be easily inserted into the hose. It is possible to accurately measure the electrical conductivity of

Note that since the flow rate of the liquid passing through the bypass 2 is slower than that of the liquid passing through the main channel 1, a delay in response occurs, but changes in electrical conductivity can also be measured.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view of a first embodiment of a flow-through conductivity cell according to the present invention, FIG. 2a is a similar view to FIG. 1 of the second embodiment, and FIG. Diagram a
FIG. 3A is also a longitudinal sectional view of the third embodiment, and FIG. 3B is a view similar to FIG. 1 of the fourth embodiment. 1...Main flow path, 2...Bypass, 3...Outlet,
4...Pole, 5...Bending passage, 1a...Upper pipe, 1b...Lower pipe, 1c...Separated portion, 1d...Large diameter portion.

Claims (1)

[Claims for Utility Model Registration] (1) An upper pipe and a lower pipe arranged with a space between them and the lower end of the upper pipe with their end faces facing each other; A large-diameter part that is airtightly surrounded by the pipe, a bypass that is open at one end between the upper pipe and the lower pipe, is formed along the outer circumference of the lower pipe, and is closed at the other end; an outlet consisting of a pore provided to communicate between the other closed end and the inside of the lower pipe;
A flow-through conductivity cell comprising an electrode exposed on the inner surface of the bypass. (2) The flow-through conductivity cell according to claim (1) of the utility model registration claim, in which the bypass is bent at a portion near the outlet.