JPH0584280A - Liquid advance preventive device - Google Patents

Abstract

PURPOSE:To surely stop the injection of liquid by suction in spite of the generation of a liquid-mixed gas or liquid contg. solid suspended materials and to enhance a dehumidifying and dust removing effect and a deodorizing and bacterium removing effect by adjacently disposing a high-polymer material which swells by absorbing the liquid and porous materials having the pores to allow the passage of the gas. CONSTITUTION:The high-polymer material 11 is packed between the two porous materials 12a and 12b and porous supporting layers 13a, 13b are disposed on the side of the porous materials 12a, 12b not in contact with the high-polymer material 11. The porous materials 12a, 12b have open cells to allow the passage of the gas and the pore sizes thereof are smaller than the grain size of the high-polymer material 11 to be used to prevent the high-polymer material 11 from overflowing. The high-polymer material 11 has the property to swell by absorbing the liquid to be injected into a container and is properly selected by the kinds of the liquid. The advance of the liquid to the outflow side is prevented in this way regardless of the generation of the liquid-mixed gas, the kinds of the liquid, etc. The effect of removing bacteria, dust and virus is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float valve or the like for a container or the like which is required to automatically inject liquid into a container when the container is filled with a predetermined amount of liquid. The present invention relates to a liquid entry prevention device used instead.

[0002]

2. Description of the Related Art When a container is filled with a liquid by suctioning it to a negative pressure, it is necessary to stop the suction so that the liquid does not flow into a suction pump or the like when the container is filled with the liquid. .. As such a stopping means, a float type water shutoff valve can be mentioned. FIG. 6 shows an example of a float type water shutoff valve, and FIG. 5 shows a container using the float type water shutoff valve of FIG. The float type water shutoff valve 8 is provided inside the frame 1.
The float basket 2 is housed, and the float basket 2 is filled with a sealing material 3 such as soft urethane foam. Frame 1
Is attached so as to fit into the exhaust pipe 5 of the container, and the inside of the container can be sucked or exhausted from the slit 4 on the side wall. In such a float type water shutoff valve 8, the float basket 2 rises in response to the rise of the liquid level 7, and finally the sealing material 3 blocks the exhaust port 6 of the exhaust pipe 5, thereby stopping the suction. To do. When the suction is stopped, the liquid filling into the container 10 is stopped.

In FIG. 5, 9 is an injection pipe, and when the inside of the container is sucked through the exhaust pipe 5, the liquid is injected from the injection pipe 9. This float type water shutoff valve 8 is not limited to the case of injecting the liquid by suction, and is the same in the case of simply injecting the liquid by applying a positive pressure to the container 10 or the liquid having the normal pressure inside. In such a case, the exhaust port 6 acts as an air vent hole,
If the sealing material 3 blocks the exhaust port 6, injection into the container 10 becomes impossible.

[0004]

However, in the case of the float type water shutoff valve 8, when the suction force is large and the liquid injection speed is fast, or when a large amount of bubbles are generated, the float basket 2 is not covered with the liquid surface 7 or bubbles. Since the sealing material 3 does not rise according to the uppermost portion and the exhaust port 6 cannot be sealed, the excessively injected liquid flows out through the exhaust port 6 and is sucked by the suction pump. Further, when a solid suspended matter is contained in the liquid, the suspended matter may be caught between the sealing material 3 and the sealing surface of the exhaust port 6 and the suction may not be stopped completely.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas mixed with a liquid such as a liquid in which the gas is dispersed like bubbles or moist air (hereinafter, referred to as Even if these (collectively referred to as liquid mixed gas) are generated, or if liquid containing solid suspended matter is generated, the liquid is not leaked to the outside and the injection of liquid by suction is reliably stopped. Another object of the present invention is to provide a liquid ingress prevention device that can perform dehumidification / dust removal effects of exhaust gas and deodorant / bactericidal / virus removal effects.

[0006]

SUMMARY OF THE INVENTION A liquid invasion preventive device according to the present invention comprises a polymer substance which swells in a gas passage by absorbing a liquid passing through the passage and a gas substance which cannot pass through the polymer substance. Is disposed adjacent to a porous material having pores therethrough. Further, in another liquid intrusion prevention device of the present invention, a polymer substance that absorbs the liquid passing through the passage and swells is uniformly distributed in the fibrous filter arranged in the gas passage.

[0007]

The liquid entry prevention device of the present invention is used by being provided in the passage with the polymer substance as the gas inflow side and the porous substance as the outflow side. The dry gas in which the liquid is not mixed passes through the liquid intrusion prevention device. On the other hand, when the liquid mixed gas flows into the liquid intrusion prevention device, the liquid component is absorbed by the polymer substance, and only the gas component flows out from the liquid intrusion prevention device. When a large amount of liquid component flows into the liquid intrusion prevention device, the polymer substance that has absorbed the liquid component swells and gels,
By blocking the pores of the porous substance and preventing gas from flowing out, it is possible to prevent the liquid component more than the polymer substance can absorb from flowing into the liquid intrusion prevention device, and thus prevent the liquid from invading the outflow side. ..

Similarly, when the polymer substance is evenly distributed in the fibrous filter disposed in the gas passage, the polymer mixture is similarly generated when the liquid mixed gas passes through the liquid intrusion prevention device prevention device. The substance absorbs only the liquid component and gels, and eventually closes the gas passage in the fibrous filter to prevent the liquid component from entering the outflow side. Such a liquid intrusion prevention device, like the conventional float type water shutoff valve 8,
Since it works in a fixed state without physical movement of the sealing material 3 etc., it prevents the liquid from leaking to the outflow side regardless of the generation state of the liquid mixed gas, the type of liquid, and the presence or absence of solid suspended matter. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid intrusion prevention device of the present invention will be described below with reference to the drawings. Liquid ingress prevention device 15 shown in FIG.
Is the polymeric substance 1 between the two porous substances 12a, 12b.
1, the porous support layers 13a and 13b are arranged on the sides of the respective porous materials 12a and 12b which are not in contact with the polymer substance 11. In FIG. 1, reference numeral 14 denotes an inner wall of a casing of the liquid entry prevention device 10, and the outer shape of the casing is appropriately selected depending on the usage conditions of the liquid entry prevention device and the like.

The porous substances 12a and 12b have open cells so that gas can pass through, and the pore size is smaller than the particle size of the polymer substance used so that the polymer substance 11 does not overflow. is there. The type and thickness of the porous substance are not particularly limited. As such a porous material, for example, a soft urethane foam of continuous foam, a rubber-based sponge in which closed cells and continuous foam are mixed, a paper filter, or a non-woven fabric filter can be used. The same type of porous substance may be used for 12a and 12b, or different types of porous substances may be used. Further, the porous substances 12a and 12b not only have a function of preventing the polymer substance from overflowing, but also have a function of removing relatively large dust or the like contained in the gas, or a virus, a bacterium or the like in the case of a medical container. Also exerts.

The polymer substance 11 filled between the porous substances 12a and 12b has a property of absorbing and swelling the liquid injected into the container, and is appropriately selected depending on the type of liquid. For example, if the liquid to be injected is mainly water,
Sodium polyacrylate, graft copolymer of starch and polyacrylic acid, saponification product of copolymer of vinyl acetate and methyl acrylate, saponification product of vinyl acetate and maleic anhydride copolymer, isobutylene and maleic anhydride A super absorbent polymer such as a saponified product of a copolymer is used. If the liquid to be injected is mainly a lipophilic liquid, a highly oil absorbing polymer such as polynorbornene is used. An aldehyde compound powder may be used for a waste liquid containing a serum tank such as blood as a main component. The filling amount of the polymer substance is the contact area between the polymer substance and the porous substance, the ratio of the pores of the porous substance,
It is appropriately selected depending on the type of liquid.

The support layers 13a and 13b are made of a porous material, and a lattice-shaped plastic plate, gauze or cotton cloth, which is a relatively coarse cloth to a fine nonwoven cloth, can be used depending on the application. In this embodiment, when the porous substance 12a and the support layer 13a are arranged on the inflow side, the gas flows in the direction of the white arrow. In this way,
When a dry gas mixed with dust, bacteria, virus, etc. flows into the liquid intrusion prevention device, the bacteria, virus, etc. are filtered by the porous substance 12a, and only the dry gas flows out. Further, when the liquid mixed gas flows in, the liquid mixed gas can pass through the support layer 13a and the porous material 12a,
The liquid component is absorbed at the polymer substance 11, and only the dry gas passes through the porous substance 12b and the support layer 13b and goes out to the outflow side. Then, the polymer substance that has absorbed a large amount of the liquid component swells and closes the pores of the porous substance 12b. In this way, even if the gas containing the liquid component tries to pass through, the liquid ingress prevention device prevents the liquid component from flowing out to the outflow side. When the liquid ingress prevention device 10 is used in a closed container or a container for injecting liquid by suction,
It also functions as a valve that stops the injection of liquid by closing the pores of the porous material 12b or the support layer 13b.

If necessary, the support layers 13a, 13b may be formed.
May be subjected to water-repellent treatment or hydrophobic treatment. For example, when the liquid is water, the support layers 13a and 13b are made water-repellent or subjected to a hydrophobic treatment to prevent an aerosol (a gas in which vapor-like liquid is mixed) from entering the liquid intrusion prevention device. As a result, the effect of preventing water from entering can be further improved. Further, if the liquid is a lipophilic liquid, by applying silicone or the like to repel the oil content, the effect of preventing the liquid from entering can be improved as in the case of preventing the ingress of water. Alternatively, a hygroscopic agent such as silica gel may be applied to the support layer 13a or the porous substance 12a arranged on the inflow side. The liquid component contained in the liquid mixed gas is previously absorbed by the hygroscopic agent before being absorbed by the polymer substance 11, so that the pores of the outflow side porous substance 12b accompanying the swelling gelation of the polymer substance 11 are formed. The time until closing is extended, and the life of the liquid intrusion prevention device is extended.

Further, the effect of preventing liquid intrusion is enhanced by subjecting the porous substances 12a and 12b or the support layers 13a and 13b to various treatments or mixing the polymer substance 11 with substances having various functions. Not only that, various functions can be added. For example, in the case of a liquid entry device used to store medical waste liquid, an antibacterial agent or a bactericidal agent is applied to the support layers 13a and 13b, or a high molecular substance is mixed between the porous substances 12a and 12b. By filling, it is possible to more effectively prevent viruses and the like from leaking to the outside. Furthermore, by mixing a deodorant, a fragrance or the like with a polymer substance and filling the space between the porous substances 12a and 12b, it is possible to deodorize the outflow gas. Furthermore, a litmus paper, a pH test paper, other test papers or test drugs are added to the support layer 1.
It is also possible to inspect the chemical change of the liquid to be injected by applying it to 3a, 13b or by mixing it with a polymer substance and filling it between the porous substances 12a, 12b.

In this embodiment, the porous material 12a,
12b Support layer 1 on the side not in contact with each polymer substance
3a and 13b are provided, but the present invention is not limited to this, and when the porous substances 12a and 12b are water-repellent and can be directly fixed to the inner wall 14 of the casing of the liquid intrusion prevention device, The support layers 13a and 13b may be omitted.

The liquid intrusion prevention device of the present invention is not limited to the structure shown in FIG. 1, but can pass gas instead of the support layer 13a and the porous substance 12a arranged on the inflow side. Moreover, an appropriate holding means may be used so that the polymer substance 11 does not overflow, or a plurality of combinations of the porous substance and the polymer substance may be arranged.

In FIG. 2, the support layer 1 arranged on the inflow side.
A configuration of a liquid intrusion prevention device using a support layer 23a made of a porous net or membrane instead of 3a and the porous substance 12a is shown. In FIG. 2, 21 is a polymer substance,
22 is a porous material. FIG. 3 shows the configuration of the liquid intrusion prevention device when two porous substance filling parts (26a, 26b) are provided. By thus forming a plurality of portions filled with the porous substance, the polymer substance 26a on the inflow side is formed.
The liquid that could not be absorbed by the above is absorbed by the polymer substance 26b on the outflow side, so that the invasion of the liquid can be prevented more reliably. It is particularly effective when the gas flow rate is faster than the swelling rate of the polymer substance.

Further, in another liquid admission device of the present invention, the polymer substance is uniformly distributed in the fibrous filter. A support layer may be provided on the inflow side and the outflow side of the fibrous filter in order to fix the fibrous filter in the passage. Here, the fibrous filter may be, for example, one in which fibers are aligned in the gas flow direction, one that is woven, or the like. The polymer substance is appropriately distributed according to the form of the fibrous filter. For example, in a filter in which fibers are aligned, a polymer substance is uniformly dispersed between the fibers. Similar to the above-described embodiment, such a liquid intrusion device prevents the polymer substance from absorbing the liquid component and flowing out to the outflow side when the liquid mixed gas passes therethrough. Further, the polymer substance swells and gels due to the absorption of the liquid component, and by closing the eyes of the fibrous filter,
Stop gas flow. In addition, the fibrous filter has not only a gas flow and a support for a polymer substance, but also a dust removing function, a bacteria removing function, and a virus removing function depending on the size of the mesh of the filter.

Next, the liquid ingress prevention device 15 shown in FIG.
With reference to FIG. 4, a concretely attached container will be described. FIG. 4 is a diagram showing the configuration of a collection and processing container for medical fluid such as body fluid discharged from a body cavity or an incision during a surgical operation or physiological saline used to wash the body fluid. The medical waste liquid collecting and processing container is configured to directly suck the waste liquid so that the waste liquid does not come into direct contact with the operator, and automatically stops the injection when a predetermined amount of the waste liquid is injected.

In FIG. 4, reference numeral 31 is a container body for storing waste liquid, and a lid portion 32 of the container body 31 is provided with an injection pipe 33 for injecting a liquid and a suction pipe 34 connected to a suction pump or the like. Has been. The suction pipe 34 is connected to a suction tube 36 of a suction pump (not shown) via the liquid ingress prevention device 15 having the configuration shown in FIG. In the medical waste liquid collecting and processing container having the above-described configuration, when suction is performed by the suction pump to make the inside of the container body 31 have a negative pressure, the waste liquid is injected into the container body 31 from the injection pipe 33. On the other hand, the air inside the container main body 31 is sucked from the suction pipe 34, but with the injection of the waste liquid, a liquid mixed gas in which the liquid is mixed with the air or sometimes bubbles are generated and sucked into the suction pipe 34. is there. These liquid mixed gases are sucked by the suction pipe 3.
4, when the liquid in the liquid mixture gas is passed through the liquid intrusion prevention device 15, the polymer substance 11 (the support layer 13a or the support layer 13a when the porous substance 12a is subjected to the moisture absorption treatment, or It is absorbed by the porous material 12a). Therefore, since only the gas in the liquid mixed gas can pass through the liquid ingress prevention device 15, the suction tube 3
Passing through 6 is a dry gas containing no liquid. Therefore, even if suction is continued in the state where bubbles and the like are generated, only the liquid component is absorbed by the liquid ingress prevention device 15, so that the bubbles are not sucked by the suction pump as in the conventional case. Then, the polymer substance 11 that has absorbed the liquid component swells and closes the pores of the porous substance 12b on the outflow side, and finally all the pores on the surface of the porous substance 12b in contact with the polymer substance 11 are closed. Block and release the suction state. Regarding the timing of releasing the suction state, the liquid ingress prevention device 15
Depending on the amount of polymer substance filled in the liquid, the generation state of the liquid mixed gas, and the like, even if the liquid level reaches the suction pipe 34, even if the suction state is still not released, the liquid level remains liquid. When the polymer substance flows into the intrusion prevention device, it immediately swells and blocks the pores of the porous substance 12b on the outflow side, so that the waste liquid does not flow out to the suction tube 36. In addition, in the liquid intrusion prevention device of the present invention, the polymeric substance is more stably retained than the membrane or the woven fabric composed of the polymeric substance itself. It is possible to shutter out the waste liquid and other liquid components without the molecular substance being gradually destroyed by suction.

Therefore, by using the liquid entry prevention device of this embodiment, entry of the liquid into the suction pump is prevented regardless of the type of liquid and the generation of liquid mixed air. The liquid entry prevention device in which the pores of the porous material are blocked cannot be reused, but by making the liquid entry prevention device detachable from the waste liquid collection processing container, the container body itself can be repeatedly used. When the liquid collection processing container is a disposable type, the liquid ingress prevention device and the container body may be integrally molded with resin.

The liquid entry prevention device of the present invention is not limited to the above-mentioned medical waste liquid collecting and processing container, but is also effective as a general valve of a liquid suction pump in which bubbles and the like are easily generated.

[0023]

As described above, since the liquid intrusion prevention device of the present invention utilizes the liquid absorption of the polymer substance, regardless of the generation of the liquid mixed gas, the kind of the liquid, etc. Prevents liquid from entering, and further remove bacteria, dust,
It has an antivirus effect and does not affect the passage of dry gas. Further, when the container is filled with the liquid by suction, the polymer substance swells in the liquid entry device to close the pores of the porous substance, so that it can function as a valve for stopping the suction.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a liquid entry prevention device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a liquid intrusion prevention device according to another embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a liquid entry prevention device according to another embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a medical waste liquid collecting and processing container to which the liquid entry prevention device shown in FIG. 1 is attached.

FIG. 5 is a diagram showing a configuration of a float type water shutoff valve which is an example of a conventional liquid ingress prevention device.

FIG. 6 is a view showing a configuration of a medical waste liquid collecting and processing container to which the float type water shutoff valve shown in FIG. 5 is attached.

[Explanation of symbols]

 11 Polymer substance 12a Porous substance 12b Porous substance 13a Support layer 13b Support layer 15 Liquid ingress prevention device 21 Polymer substance 22 Porous substance 23a Support layer 23b Support layer 25a Polymer substance 25b Polymer substance 26a Porous substance 26b Porous substance 26c Porous substance 27a Support layer 27b Support layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomoyasu Yamashita 4-36 Higashi-Funao-cho Higashi-Sakai, Osaka Prefecture Daiken Medical Equipment Co., Ltd. Research Institute (72) Mie Higashi 4 Hamadera-Funao-cho, Sakai-shi, Osaka Prefecture Ding 36 Daiken Medical Equipment Research Institute (72) Inventor Masumi Kobayashi 4-60 Sunadabashi, Higashi-ku, Nagoya-shi, Aichi Mitsubishi Rayon Co., Ltd. Product Development Laboratory

Claims (2)

[Claims] 1. In a gas passage, a polymer substance that absorbs a liquid passing through the passage and swells, and a porous substance having a hole through which the polymer substance cannot pass but a gas can pass are adjacent to each other. A liquid ingress prevention device, which is characterized in that 2. A liquid intrusion prevention device, characterized in that, in a fibrous filter arranged in a gas passage, a polymer substance that absorbs a liquid passing through the passage and swells is uniformly distributed. ..