JPS6227217Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a gas mixing circuit that mixes two or more types of gases in an arbitrary ratio, and particularly relates to an improvement of a gas mixing circuit used in artificial respirators, etc. .

Generally, a gas mixing circuit uses a mixer to adjust the flow rate of each input gas to a desired mixing ratio. For example, if one of two gases is fully opened while the other is When setting the mixer to a mixing ratio that completely closes the gas, in conventional gas mixing circuits, the gas is not completely shut off and there is a risk of leakage, which can cause problems especially when used in artificial respirators. The sex was hot.

In other words, when used in a ventilator, when one gas (e.g. air) is fully opened and the other gas (e.g. oxygen) is fully closed, if the isolation is not completed and a leak occurs, it may be life threatening to the patient. may pose a risk of

The present invention was developed with the aim of solving the above-mentioned problems, and a flow path switch is installed in the middle of the input gas conduit of a mixer used in a ventilator, etc., to control the input gas. When the mixing ratio of the mixer is set so that the mixer is completely closed, the flow path switch is closed in response to this setting to prevent the gas from flowing into the mixer from the outside. be.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of the present invention. In FIG. 1, a pressure regulator 3 is provided in the middle of a first gas conduit 2 that is connected to the input side of a mixer 1 and into which gas a (for example, air) is introduced. A flow path switch 4 is provided. Further, a pressure regulator 6 is provided in the middle of a second gas conduit 5 which is connected to the other input side of the mixer 1 and into which gas b (for example, oxygen) is introduced. A road switch 7 is provided. Further, an output conduit 8 is connected to the output side of the mixer 1. The set value detectors 9 and 10 each detect that the setting is made to cut off gas a or b in the mixer 1, and based on this detection output, they close the flow path switches 4 and 7, respectively. It is composed of Note that the pressure regulators 3 and 6
are each equipped with a pressure adjustment means (not shown).

The set value detectors 9 and 10 are configured as shown in FIG. 2, for example. That is, in Fig. 2, by turning the setting dial 11 provided on the mixer 1 to the left, the flow rate of gas a is reduced and gas a is completely closed at position A, and conversely, at the final position B of clockwise rotation. Assuming that gas b is completely closed, an actuating member 13 is attached to the shaft 12 of the setting dial 11, and the micro switch 14 is turned on by this member 13 at the A position.
The microswitch 15 is configured to operate at the B position. The outputs of the microswitches 14 and 15 are used as detection outputs of the set value detectors 9 and 10, respectively. Note that the end ports of each of the gas conduits 2 and 5 are located inside the mixer 1, respectively. Each tip opening is provided with a valve, and the valve operates according to the rotation of the setting tire 11, and the opening degree of the tip opening changes accordingly.

That is, as shown in FIG.
When 1 is located at the center (position pointing to 1/2), the gas conduits 2 and 5 are in a state where half of their tip openings are open. Then, when the setting tire 11 is rotated to the left (counterclockwise) from the position shown in FIG. The degree increases by more than half.
Thereafter, when the setting tire 11 comes to position A, the gas conduit 2 is fully closed, and the gas conduit 5 is fully opened.

On the contrary, the setting tire 11 is the second
When rotating from the position shown in the figure to the right (clockwise), the opening degree of the tip end of the gas conduit 2 increases to more than half, and the opening degree of the tip end of the gas conduit 5 decreases to less than half. Thereafter, when the setting tire 11 comes to position B, the gas conduit 2 is fully opened, and furthermore, the gas conduit 2 is fully closed.

In the above configuration, if the setting dial 11 of the mixer 1 is now rotated to the right and set to position B, and the mixing ratio is set to gas a fully open and gas b fully closed, the micro switch 15 is activated by the member 13. operates,
This output is derived as the output of the set value detector 10 and closes the flow path switch 7. This operation prevents gas b from flowing into the mixer, thereby preventing gas b from leaking inside the mixer.

As described above, according to the gas mixing circuit of the present invention, when the gas inside the mixer is completely closed, the flow path switch provided on the gas conduit on the input side is always used to prevent the gas from flowing into the mixing inside. This prevents inflow and completely prevents gas from leaking inside the mixer, making it particularly suitable for use in artificial respirators and the like.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing one embodiment of the present invention;
The figure is a diagram showing an example of the configuration of a setting dial of a mixer. 1: mixer, 2 and 5: input side gas conduit, 4 and 7: flow path switch, 9 and 10: set value detector.

Claims (1)

[Scope of utility model registration request] When multiple gas conduits for introducing gas into a mixer are connected, a flow path switch is provided in the middle of each gas conduit, and the mixing ratio of the mixer is set so that the input gas is completely closed. 1. A gas mixing circuit characterized in that the circuit is configured to close a flow path switch provided in a gas conduit for the gas set to the fully closed state.