JP2000081156A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive check valve not to exert so much economical burden even by waste disposal at every one time use and besides reliably provide a reverse flow preventing function. SOLUTION: A high pressure fluid inlet 12 is formed in one end part of a hollow cylindrical body 11 formed of a material having elasticity and a high pressure fluid outlet 13 is formed in the other end part thereof. Pressure bearing surfaces 14 and 14 are formed on the outer peripheral surface on the high pressure fluid outlet 13 side of the cylindrical body 11. The high fluid outlet 13 is formed by a cut normally closed by elasticity of the material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is preferably used when a paint or the like is filled in a spray container (aerosol can) or the like which is pre-filled with a high-pressure gas necessary for spraying the contents. About.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 49-40676 and Mitsuto 3
No. 041821 describes that a spray container pre-filled with a high-pressure gas is carried into a store, and the store fills the spray container with a small amount of paint toned according to a customer's request. There is. Further, these publications disclose that when a paint is filled in a spray container, a stem provided with a nozzle for spraying the paint from the spray container is used as a filling port.

When a paint is filled into a spray container pre-filled with a high-pressure gas by using the stem as a filling port, it is necessary to prevent the high-pressure gas in the spray container from flowing back from the filling port. . As one of the check valve mechanisms for preventing the backflow of the high-pressure gas, there is a configuration using a coil spring or a sphere constantly biased by the coil spring.

[0004]

However, such a check valve mechanism is used for filling a small amount of paint, which is toned according to the customer's request, into the spray container at a store, and is used after each use. It is economically problematic to use it in a so-called disposable form, such as disposing of it at a waste disposal site.

On the other hand, on the premise that the above-mentioned check valve mechanism is repeatedly used, if a paint having a color tone according to a customer's request is prepared at a store, the check valve mechanism is used every time the check valve is used. Since it must be completely washed and removed with a volatile solvent such as a thinner to prepare for the next use, it is not only troublesome, but also has a risk of adversely affecting the health of workers and a danger of ignition.

The present invention has been made in view of the above problems and circumstances, and it is inexpensive. It is not economically burdensome to dispose each time it is used. It is an object to provide a check valve that can be used.

[0007]

The check valve according to the present invention comprises:
A high-pressure fluid inlet is provided at one end of a hollow cylindrical body made of a material having elasticity, and a high-pressure fluid outlet is provided at the other end, and an outer peripheral surface of the cylindrical body on the high-pressure fluid outlet side is provided. A pressure receiving surface is formed, and the high pressure fluid outlet is
It is formed by a cut which is always closed due to the elasticity of the material.

The check valve according to the present invention can be provided at a low cost because it can be integrally formed of rubber or a soft synthetic resin, and therefore, is discarded after each use. Familiar with the disposable, the economic burden does not become so large even if such disposable.

In the check valve according to the present invention, when a paint such as a liquid dispersed pigment is pushed in from a high-pressure fluid inlet using, for example, a medical or industrial syringe, the pressure of the paint at that time causes the high-pressure fluid to flow. The outlet cut is opened and the paint is forced out of the high pressure fluid outlet. Further, since the pressure receiving surface is formed on the outer peripheral surface on the high pressure fluid outlet side, when the pressure of the high pressure gas pre-filled in the spray container is applied to the pressure receiving surface, the cutoff of the high pressure fluid outlet is caused by the pressure. Are pressed in the closing direction, thereby preventing the backflow of the high-pressure gas.

In the check valve, the pressure receiving surface of the tubular body is formed in a constricted shape toward the other end of the tubular body, and the tubular body has a fluid at one end thereof. It is possible to adopt a configuration in which the injection means has a connection port to the nozzle and can be attached to a cylindrical housing having a connection port to the filling port of the high-pressure fluid filling container at the other end.

In the check valve thus configured, a nozzle of a fluid injection means formed by a syringe or the like is inserted into a connection port at one end of a cylindrical housing, and the other end of the housing is connected. The mouth can be used by connecting to a filling port of a high-pressure fluid filling container such as a spray container.

Another check valve according to the present invention has an inlet side connection port at one end to which the nozzle of the fluid injection means is connected, and an outlet side to which the other end is connected to the filling port of the high-pressure fluid filling container. A cylindrical portion having a connection port, the respective inlet ports on the inlet side and the outlet side communicating with each other via an internal passage, and dividing the internal passage of the cylindrical portion into an inlet section and an outlet section. And a valve portion for opening and closing the internal passage by opening and closing the notch, wherein the cylindrical portion and the valve portion are made of a material having elasticity, and the inlet-side section of the valve portion A contact surface is formed on the surface facing to the end surface of the nozzle connected to the inlet-side connection port, and an inner peripheral portion of a contact portion between the contact surface and the end surface of the nozzle is Being located inside the base of the surface of the valve section facing the outlet section A.

[0013] The check valve according to the present invention can also be provided at a low cost because it can be integrally formed of rubber or a soft synthetic resin. Familiar with such a disposable, the economic burden is not so great. In addition, there is a convenience that can be used alone without using the above-described housing.

Further, in this check valve, the inner peripheral portion of the contact portion between the contact surface formed on the surface of the valve portion facing the inlet-side section and the end surface of the nozzle is provided on the outlet side of the valve portion. It is located inside the base of the surface facing the compartment. For this reason, the valve section is easily deformed by warping toward the outlet section,
It is unlikely to be warped and deformed in the opposite direction to the entrance-side section. This prevents backflow of high pressure gas from a high pressure fluid filled container such as a spray container.

In the spray container filled with paint or the like using the check valve of the present invention, a valve member for opening and closing an internal passage of a stem used as a filling port (even if the valve member is arranged in the internal passage). , Which may be arranged outside the beginning or end of the internal passage.), And the valve member of which is structured to be opened by depressing the stem itself, or provided on the stem. A valve member for opening and closing the internal passage (which may be disposed inside the internal passage or outside the start or end of the internal passage); And various structures, such as those that are opened by a pushing operation of a pin-shaped member inserted into the device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a check valve 1 according to the first and second aspects of the present invention, and FIG.
FIG. 3 is a view as seen in the direction of the arrow III in FIG. 2, and FIG. 4 is a sectional view of the check valve 1 in use.

The check valve 1 is integrally formed using a material such as rubber or a soft synthetic resin. This check valve 1
The high pressure fluid inlet 12 is provided at one end of the hollow cylindrical body 11 and the high pressure fluid outlet 13 is provided at the other end. The high-pressure fluid outlet 13 is formed by a cut which is normally closed by the elasticity of the material. On the high-pressure fluid outlet 13 side of the cylindrical body 11, two outer surfaces located on opposite sides in the circumferential direction are pressure receiving surfaces 14, 14 formed by flat inclined surfaces. Therefore, the pressure receiving surfaces 14 are formed in a constricted shape toward the other end of the cylindrical body 11. When the pressure receiving surfaces 14 and 14 are flat as described above, the pressure applied to the pressure receiving surfaces 14 and 14 closes the high pressure fluid outlet 13 formed by the cut as compared with the case where the pressure receiving surface 14 is formed as a conical surface. Has the advantage of being used effectively.

The check valve 1 is used by being mounted on a housing 2 shown in FIG. The housing 2 in FIG. 1 includes a cylindrical housing main body 21 made of a synthetic resin molded body, and a chip 22 attached to the housing main body 21. One end and the other end of the housing body 21 are formed as connection ports 23 and 24, respectively. The connection port 23 at one end can be connected to a nozzle 31 of the fluid injection means 3 (described later). The connection port 24 at the other end can be connected to a stem 41 of a high-pressure fluid-filled container 4 (described later).

More specifically, the chip 22 is fitted into the connection port 23 at one end.
2 is configured to be fitted to the outside of the nozzle 31. Further, a stepped seat surface 25 is formed in a ring shape at an axially intermediate portion of the housing body 21. Then, the flange 15 of the check valve 1 inserted into the housing body 21 is placed on the seating surface 25, and the flange 15 is fitted to the bottom wall 26 of the chip 22 fitted in the connection port 23. It is clamped by the seat surface 25 so that the clamped portion is sealed in a liquid-tight manner. A passage 28 is provided in the bottom wall 26, and the passage 28 communicates with the high-pressure fluid inlet 12 of the check valve 1. In this embodiment, an annular convex portion 27 and a concave portion 27A are separately provided on the chip 22 and the inner periphery of one end of the housing body 21, and the engagement of the convex portion 27 and the concave portion 27A causes the chip 22 to engage. Is fixed to one end of the housing body 21. Note that the connection port 23 of the housing body 21 may be configured to be directly fittable to the outside of the nozzle 31. Next, a stepped portion 29 is formed in an annular shape at the connection port 24 at the other end. Then, the connection port 24 is connected to the stem 41.
The insertion margin at the time of being inserted into the is restricted by the stepped portion 29. The step 4 has a stem 4
A passage 20 communicating with one internal passage 42 is provided.
When the check valve 1 is mounted on the housing 2, spaces S, S are formed outside the pressure receiving surfaces 14, 14 provided on the cylindrical body 11 of the check valve 1.

The high-pressure fluid-filled container 4 shown in FIG. 4 is a spray container (in the following description, the spray container is denoted by reference numeral 4), and its stem 41 has a normally closed interior that is opened by an opening operation. A passage 42 is provided.

As the fluid injection means 3 shown in FIG. 4, a medical or industrial disposable syringe can be suitably used (in the following description, the syringe is denoted by reference numeral 3). If this is a medical or industrial syringe 3,
Collect paints such as liquid dispersion pigments based on weight,
Alternatively, if the syringe is graduated, not only can the paint such as a liquid dispersion pigment be accurately measured and collected by a necessary amount by looking at the scale, but also all the collected paint can be extruded. It is. The syringe 3 has a syringe 32 having a nozzle 31 at one end and a piston 33 for pushing out a paint such as a liquid dispersion pigment collected in the syringe 32 from the nozzle 31. The piston 33 is slidably sealed by the syringe 32. Rubber ring 34 is mounted. Then, the chip 22 of the housing 2 is fitted to the outside of the nozzle 31 as described above.

As shown in FIG. 4, a housing 2 equipped with a check valve 1
In the state where the nozzle 31 of the syringe 3 and the stem 41 of the spray container 4 are connected via the, the paint is filled from the syringe 3 into the spray container. This filling operation is performed, for example, while an operation of opening the internal passage 42 of the stem 41 of the spray container 4 (for example, an operation of pushing down the stem 41) is performed while a required amount of the liquid dispersed pigment previously collected in the syringe 32 of the syringe is maintained. This is done by pushing down the piston 33 and pushing out the paint from the nozzle 31. In this way, the paint pressed by the piston 33 reaches the high-pressure fluid outlet 13 through the nozzle 31, the passage 28, the high-pressure fluid inlet 12 of the check valve 1, and the internal space of the check valve 1 in this order. Then, the paint that has reached the high-pressure fluid outlet 13 generates a pressure corresponding to the pushing force of the piston 33 and pushes and expands the high-pressure fluid outlet 13 as indicated by a virtual line in FIG. . The paint that has passed through the high-pressure fluid outlet 13 in this way passes through the passage 20, the stem 41
Is filled into the spray container 4 through the internal passage 42.

On the other hand, the housing 2 is connected to the stem 4 of the spray container 4.
When the high-pressure gas is ejected through the internal passage 42 of the stem 41 during mounting or dismounting on or during the filling operation, the high-pressure gas thus ejected enters the space S and the pressure is reduced by a check valve. The cut formed by the pressure receiving surfaces 14 and 14 and forming the high-pressure fluid outlet 13 by the pressure applied to the pressure receiving surfaces 14 and 14 is closed. Therefore, the high-pressure gas does not flow backward through the high-pressure fluid outlet 13 of the check valve 1.

It is desirable that the casing 2, the check valve 1, and the syringe 3 be disposed of after each use. By doing so, the housing 2, the check valve 1, and the syringe 3
This eliminates the necessity of cleaning the water and preparing for the next use, so that the operator is free from the trouble of cleaning, the adverse health effects due to the diffusion of the solvent, and the danger of ignition.

FIG. 5 is a sectional view of the check valve 1 according to the third aspect of the present invention in a used state. The check valve 1 is formed of a resilient material such as rubber or flexible synthetic resin having a cylindrical portion 51 and a valve portion 52 integrally. The cylindrical portion 51 has an inlet-side connection port 53 to which the nozzle 31 of the syringe 3 is connected at one end, and an outlet-side connection port 54 to which the stem 41 of the spray container is connected at the other end. . Further, the valve portion 52 has a role of partitioning the internal passage 55 of the tubular portion 51 into an inlet-side section 55a and an outlet-side section 55b, and has a role of opening and closing the internal passage 55 by opening and closing the notch 56. I have. Therefore, when the cut 56 is open, the connection ports 53 and 54 on the inlet side and the outlet side communicate with each other through the internal passage 55, and when the cut 56 is closed, the internal passage 55 is closed by the valve portion 52. It is.

On the surface of the valve section 52 facing the inlet-side section 55a, a contact surface 57 with which the end face of the nozzle 31 connected to the inlet-side connection port 53 abuts is formed in an annular shape. The inner peripheral portion a of the contact point between the contact surface 57 and the end surface of the nozzle 31 is located radially inward of the base b of the surface of the valve portion 52 facing the outlet-side section 55b. Further, the peripheral surface 55c of the outlet-side section 55b is constricted so that the diameter in the axial middle part is small as shown in the figure.

The nozzle 31 of the syringe, which is the fluid injection means 3, is inserted and connected to the inlet side connection port 53. The outlet connection port 54 has a stem 41 of the spray container.
Is inserted, and the distal end of the stem 41 is connected to the outlet-side section 55.
b is abutted against the constricted peripheral surface 55c. Therefore, the tip portion of the stem 41 does not hit the valve portion 52.

In such a check valve 1, the nozzle 31 of the fluid injection means 3 is provided without using the housing 2 as described in FIG.
And the stem 41 of the spray container.

With the nozzle 31 of the syringe 3 and the stem 41 of the spray container connected to each other via the check valve 1 as shown in FIG. 5, paint is filled from the syringe 3 into the spray container. For this filling operation, for example, it is necessary that the operation is performed before opening the internal passage 42 of the stem 41 of the spray container (for example, the operation of pressing down the stem 41) and the syringe 32 of the syringe 3 serving as the fluid injection means is collected in advance. This is performed by pushing down a piston (not shown) from the nozzle 31 with an amount of paint such as a liquid dispersion pigment. In this way, the paint pressed by the piston reaches the valve section 52 through the nozzle 31. Then, the paint that has reached the valve portion 52 generates a pressure corresponding to the pushing force of the piston, and warps and deforms the valve portion 52 toward the outlet side section 55b as shown by an imaginary line. For this reason, the cut 56 is opened, and the paint passes through the cut 56, and the outlet side section 55
b, The spray container is filled through the internal passage 42 of the stem 41.

On the other hand, the check valve 1 is connected to the stem 4 of the spray container.
When the high-pressure gas is ejected through the internal passage 42 of the stem 41 when the high-pressure gas is ejected through the internal passage 42 of the stem 41 during attachment or detachment from the fuel cell 1, the high-pressure gas thus ejected enters the outlet section 55b, and the pressure is reduced. The part 52 is pressed toward the entrance-side section 55a. However, in the check valve 1, the inner peripheral portion a of the contact point between the contact surface 57 of the valve portion 52 and the end surface of the nozzle 31 is closer to the base portion b of the surface of the valve portion 52 facing the outlet-side section 55 b. Is also located inside,
The valve section 52 is unlikely to be warped and deformed toward the entrance-side section 55a. Therefore, even if the high-pressure gas presses the valve portion 52 toward the inlet-side section 55a, the cut 56 does not open, and the backflow of the high-pressure gas from the high-pressure fluid-filled container such as a spray container is prevented.

It is similar to the embodiment described with reference to FIGS. 1 to 4 in that it is desirable to discard the check valve 1 and the syringe after each use.

In the above description, as the spray container into which the fluid is injected via the check valve 1, the internal passage 42 formed by the stem 41 is opened by pushing the stem 41 itself from the initial position. An open structure is used. In the spray container having this structure, a valve member (not shown: for example, a cut formed in a rubber material) for opening and closing the internal passage 42 of the stem 41 is provided inside the internal passage, at the beginning of the internal passage. And a structure in which the cut of the valve member is pushed open by the stem itself or a member interlocking with the stem when the stem 41 is pushed down. There is.

Another type of spray container is shown in FIGS. When an opening operation of pushing the stem 400 from the initial position against the force of the spring 410 that constantly urges the stem 400 toward the initial position side is performed, the stem 400 used in this spray container becomes as shown in FIG. When the passage 420 provided in the stem 400 is separated from the packing 430 to open the internal passage 440 and the stem 400 is returned to the initial position by the force of the spring 410, as shown in FIG. 420 is packing 430
And the internal passage 440 is closed. In such a spray container 4, a nozzle (not shown) is generally attached to the stem 400 and used.

FIG. 8 shows another type of spray container.
There is what was shown in. In this apparatus, a valve member for opening and closing an internal passage provided in a stem of a spray container is opened by a pushing operation of a pin-shaped member inserted into the stem. An example in which a fluid is injected into such a spray container via the check valve 1 will be described with reference to FIG.

As shown in FIG. 8, a stem 200 used for a spray container is attached to a top plate 300 of the spray container, and has a stepped valve seat portion 202 at an intermediate portion of an internal passage 201 thereof. And the valve seat 202
Spring body 203 in a direction to close the internal passage 201 by elastic contact with
The valve member 205 is constantly urged by the valve member 205. The spray container provided with such a stem 200 includes:
In an original actual use state, for example, a cap (not shown) attached to the stem 200 is provided with an operation pin (not shown), and when an opening operation of pushing the operation part of the cap with a finger is performed, the stem 200 The operation pin, which has been inserted in advance, is pushed into the valve
The valve member 205 is separated from the valve seat 202 and the internal passage 201 is opened.

FIG. 8 is an explanatory view schematically showing a case in which a fluid such as a liquid dispersion pigment is filled using the check valve 1 into the spray container from which the cap and the operation pin have been removed. This figure corresponds to a case where only the spray container 4 shown in FIG. 4 is replaced by the spray container of FIG.

In the figure, a required amount of paint such as a liquid dispersion pigment collected in a syringe 32 of a syringe 3 which is a fluid injection means is pushed down by a piston 33 to form a nozzle 31.
When the paint is extruded from the
In this case, the pressure reaches the internal passage 201, and the pressure corresponding to the pushing force of the piston is generated to push down the valve member 205 against the urging of the spring body 203, so that the internal passage 201 is opened and the paint is filled in the spray container. You.

Other items are the same as those described with reference to FIGS. 1 to 4, and the check valve 1 shown in FIG.
It is also possible to use in combination with the spray container described above.

[0039]

As described above, the check valve according to the present invention comprises:
It is inexpensive, and there is an effect that disposal after each use is not so economically burdensome, and that a backflow prevention function is reliably exhibited.

[Brief description of the drawings]

FIG. 1 is a front view of a check valve according to the first and second aspects of the present invention.

FIG. 2 is a side view of the check valve.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a cross-sectional view of the check valve in use.

FIG. 5 is a sectional view of the check valve according to the third aspect of the invention in a used state.

FIG. 6 is a cross-sectional view illustrating a main part of the spray container.

7 is a cross-sectional view illustrating a main part of the spray container of FIG. 6 in a state where an internal passage of a stem is open.

FIG. 8 is a schematic explanatory view of another use state of the check valve of FIGS. 1 to 3;

[Description of Signs] 1 Check valve 2 Housing 3 Syringe (fluid injection means) 4 Spray container (High pressure fluid filling container) 11 Cylindrical body 12 High pressure fluid inlet 13 High pressure fluid outlet 14 Pressure receiving surface 23, 24 Connection port 31 Nozzle 41 Stem (Filling Port) 51 Cylindrical Portion 52 Valve Portion 53 Inlet-side Connection Port 54 Outlet-side Connection Port 55 Internal Passage 55a Inlet-Side Section 55b Outlet-Side Section 56 Cut 57 Contact Surface A Contact between Contact Surface and Nozzle End Surface (B) The base of the surface facing the outlet section of the valve

Claims (3)

[Claims] 1. A high-pressure fluid inlet is provided at one end of a hollow tubular body made of a resilient material, and a high-pressure fluid outlet is provided at the other end thereof, and the high-pressure fluid outlet of the tubular body is provided. A pressure receiving surface is formed on an outer peripheral surface on a side, and the high-pressure fluid outlet is formed by a cut which is normally closed due to the elasticity of the material. 2. The pressure receiving surface of the cylindrical body is formed in a constricted shape toward the other end of the cylindrical body.
The cylindrical body can be mounted on a cylindrical housing having a connection port to a nozzle of a fluid injection means at one end and a connection port to a filling port of a high-pressure fluid filling container at the other end.
The check valve described in the above. 3. One end has an inlet-side connection port to which the nozzle of the fluid injection means is connected, and the other end has an outlet-side connection port to which the filling port of the high-pressure fluid-filled container is connected. And a cylindrical portion in which the connection ports on the side and the outlet side communicate with each other through an internal passage, and partitioning the internal passage of the cylindrical portion into an inlet-side section and an outlet-side section, and opening and closing a cut to form the internal passage. A valve portion that opens and closes, and the tubular portion and the valve portion are made of a material having elasticity; and a surface of the valve portion facing the inlet-side section has an inlet side. A contact surface with which the end face of the nozzle connected to the connection port is in contact is formed, and an inner peripheral portion of a contact point between the contact surface and the end face of the nozzle is in contact with the outlet-side section of the valve portion. A non-return valve, which is located inside the base of the surface to be made.