JP5662871B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve that moves a moving element by depressurization and relaxes the depressurization state in the flow path by setting the flow path to a flow state.

In recent years, a technique for saving water, such as mixing a gas such as air or carbon dioxide gas with water or warm water or dissolving it in a special function bath, has been developed. For this reason, pressure fluctuations such as pressurization and depressurization are often applied to water-related parts such as pipes, pressure hoses, joints, and faucet fittings.
Conventionally, these water-related parts have been devised to withstand the applied pressure because they are often subjected to pressure in the water distribution system of the waterworks, but the durability under reduced pressure is not always sufficient.
For example, if the pressure-reducing environment continues, the pressure-resistant hoses, the joint seal portion, and the like are not desirable because they are subjected to a stress that deforms without being expected.

  In such application fields, there is a need for a check valve that moves the mover by depressurization and relaxes the depressurization state in the flow path by setting the flow path as a circulation state. In particular, there is a strong demand for a check valve that has a simple and simple structure and operates reliably at a low cost.

Conventionally, many check valves have been developed in the field of industrial equipment such as hydraulic machines, in which a moving element moves due to pressure fluctuations and flows through a flow path.
For example, in Patent Document 1 below, the pressure oil supplied from the pressure port P pushes and opens the check valve body 30 and flows into the hydraulic drive chamber 2 through the work port A, and the internal pressure of the hydraulic drive chamber 2 increases. A check valve structure is shown in which the check valve body 30 is pressed against the check valve seat 28 by a check spring 31 to close the valve. However, in order to maintain the pressure in the hydraulic drive chamber 2, the check valve body 30 is also provided with a bypass valve seat 40, a fluid pressure piston 33, and the like, and has a complicated structure and a delicate mechanism unique to hydraulic equipment. Therefore, it is not suitable for application fields other than industrial equipment.

A check valve equipped with a moving element is also used in the field of special equipment other than hydraulic machines. For example, Patent Document 2 below discloses a check valve that is attached to an exterior tube film of a surgical endoscope and allows only gas outflow from the inside to the outside. The check valve is equipped with a forced valve opening mechanism that relieves the negative pressure state of the outer tube coating of the endoscope after autoclave sterilization treatment, so multiple valve elements of the mover and valve opening maintenance The cam groove and the drive pin have a complicated structure, which is not suitable for general purposes.
In addition, none of the check valves is a check valve that relieves the depressurization state in the flow path by moving the moving element due to the reduced pressure and setting the flow path in a circulating state.

JP-A-4-57637 JP 2009-89765 A

  The present invention was invented in view of the problems of the above-described conventional check valve with a moving element, and is a simple check valve having a simple mechanism that moves the moving element to flow through pressure reduction in the flow path. However, it is an object of the present invention to provide a check valve that can solve the problem that the moving part does not move and the valve cannot be opened even if the inside of the flow path is in a reduced pressure state due to the sticking of the seal part due to long-term non-use.

In order to solve the above-described problem, the check valve of the present invention includes a moving element in a fixed portion in which a flow path is formed, and the moving element moves in the flow path by depressurization. The check valve includes an external pressurizing unit that moves the mover from the closed state to the flow state . The external pressurizing unit includes a through hole inside and flows through the flow path depending on the diameter of the through hole. The amount of gas is set .

In this check valve, it is preferable to close the flow path by sandwiching a packing between the fixed portion and the moving element .

  According to the check valve of the present invention, when the inside of the flow path is depressurized, the moving element moves, the flow path is in a circulating state, and the depressurized state can be steadily eased. Even if the seal part of the valve is fixed, the reduced pressure state can be reliably relaxed by moving the slider from the closed state to the flow state by the external pressurizing means.

In one Embodiment of the non-return valve of this invention, a flow path is sectional drawing which shows a valve closing state in a non-decompression state (a). It is a non-return valve of embodiment same as the above, and a flow path is a pressure reduction state (b), and is sectional drawing which shows a valve opening state. It is a check valve of the same embodiment as the above, and is a cross-sectional view in which the valve is forcibly opened by an external pressurizing means and is in a flow state (d).

<Structure of check valve components>
One embodiment of the check valve of the present invention is as shown in the sectional view of FIG. If the flow path at the lower end of the check valve and the flow path (not shown) connected to the lower end flow path are in a non-depressurized state (a), the mover 1 inside the check valve is in an almost no load state. And is pressed against the upper end throttle portion 31 of the fixed portion 3 in the check valve case 5 by the mover push-up spring 4.

<Check valve closing>
It can be said that the upper-end throttling portion 31 of the fixed portion 3 corresponds to a valve seat with respect to the movable valve of the moving element 1.
The packing 2 made of an annular rubber seal or the like interposed between the mover 1 and the upper end throttle portion 31 of the fixed portion 3 is compressed by being compressed from both sides to close the gap between the two.
That is, when the flow path of the check valve is in the non-depressurized state (a), the seal portion 6 including the movable element 1, the packing 2, and the fixed portion 3 is closed, and the check valve is closed. .

  For convenience of explanation, an operating mechanism of a check valve provided with a seal portion 6 consisting of a movable member 1, a packing 2, and a fixed portion 3 is taken up. However, the movable member 1 or the fixed portion 3 is easily elastically deformed. If it consists of a raw material, the seal part which consists of two persons which omitted the packing 2 which intervenes is also possible.

<Opening check valve>
FIG. 2 shows a check valve of the same embodiment as above, in which the flow path of the check valve is in a reduced pressure state (b) and the check valve is open. Since the configuration of each member is the same as that of the embodiment described in FIG. 1, detailed description thereof is omitted.

Since the flow path at the lower end of the check valve and the flow path (not shown) connected to the lower end flow path are in a reduced pressure state (b), the mover push-up spring is provided in the mover 1 inside the check valve. The pressure which moves downward acts against the pushing force of 4, and is moving.
The packing 2 made of an annular rubber seal or the like interposed between the moving element 1 and the upper-end throttle part 31 of the fixed part 3 is released from the pressing force from both and returns to the original circular cross-sectional shape. And the fixed portion 3 are released, and the fluid can pass therethrough. The seal portion 6 consisting of the movable element 1, the packing 2, and the fixed portion 3 is open.

  In the check valve of the illustrated embodiment, an example is shown in which fluid flows to the flow path below the check valve through the through hole 71 of the external pressurizing means 7 provided on the check valve. However, even when the through hole 71 is not provided, the fluid can be configured to flow to the flow path below the check valve.

  The external pressurizing means 7 is pushed up and retracted by the external pressurizing means push-up spring 8 so as not to obstruct the movement of the moving element 1 except during pressurization. If the element does not dare to be airtight and does not contribute to the opening and closing of the flow path, the through hole 71 is unnecessary and the fluid flows to the flow path below the check valve.

On the other hand, if a through hole 71 is provided in the external pressurizing means 7 and a packing 72 made of an annular rubber seal or the like is added to the rubbing portion with the fixed portion 3 to form an airtight structure, the through hole 71 flows in with a large or small diameter. The flow rate of fluid per hour can be adjusted.
As a result, for example, in the case of a check valve used around a household bathroom, the diameter of the through hole 71 is set to be small and the pressure fluctuation around the flow path is moderated so that it can be operated quietly. Can do.

  When the check valve is released, the flow path at the lower end of the check valve and a flow path (not shown) connected to the flow path at the lower end, for example, the pressure hose, are supplied with air through the released check valve. In time, the reduced pressure state (b) on the flow path side is relaxed, and the force for moving the mover 1 downward disappears.

Then, the mover 1 is pressed against the upper end throttle portion 31 of the fixed portion 3 in the check valve case 5 according to the push-up force of the mover push-up spring 4.
The packing 2 made of an annular rubber seal or the like interposed between the moving element 1 and the upper end throttle portion 31 of the fixed portion 3 is pressed from both to compress and deform to close the gap between them.
That is, the flow path of the check valve returns to the state of FIG. 1 in the non-depressurized state (a) and the closed state in which the check valve is closed.

<Forced opening of check valve>
In the check valve of the same embodiment as described above, the mechanism for forcibly opening the moving element 1 by pressurizing (c) the moving element 1 downward by the external pressurizing means 7 and the flow state (d) and its operation An example is shown in FIG. Since the configuration of each member is the same as that of the embodiment described with reference to FIGS. 1 and 2, detailed description thereof is omitted.

  The flow path at the lower end of the check valve and the flow path (not shown) connected to the lower end flow path are in a non-depressurized state, and the flow blocked state of the check valve as shown in FIG. 1 is long. When it continues, the seal part 6 composed of three members, such as a packing 2 made of an annular rubber seal, the mover 1 and the fixed part 3 is fixed, and the mover 1 does not move smoothly despite the reduced pressure state. Since the valve may not be opened as shown in FIG. 2, the mechanism is forcibly opened by pressurizing (c) the mover 1 downward by the external pressurizing means 7, thereby setting the flow state (d). is there.

  The temporary sticking phenomenon of the seal portion 6 occurs due to various causes such as a minute bleed-out component from the annular rubber seal material, the presence of fine dust passing through the flow path, adhering fine particles, and temporary plastic deformation of the packing. So it cannot be completely eliminated.

Therefore, the forced valve opening mechanism by the external pressurizing means 7 is significant. Moreover, with the simple structure shown in the figure, the recovery of the check valve function can be confirmed from the feel and vibration during the pressurization operation, and the operation status of the water system where the check valve is attached It has an additional effect such that it can be estimated.
These forcible valve opening operations are effective when carried out when a decrease in the flow rate is detected, or by carrying out periodic inspections every month, for example.

<Other embodiments>
In the above embodiment, the description has been made on the assumption that the fixing portion 3 is provided inside the check valve case 5. However, if a high-performance engineering plastic or the like is selected as a material, the check valve case and the fixing portion are separated. An integrated member configuration is also possible.

In that case, if the surface of the valve seat (upper end throttle part of the fixed part) with which the moving element comes into contact is devised, such as providing a fine groove that circulates, to increase the apparent flexible deformation, The seal can be formed without any problems.
Moreover, if the shape design such as increasing the apparent contact area between the moving element and the valve seat is made, a seal part without packing can be formed as described in the 14th paragraph.

  In order to construct a check valve that operates reliably while reducing the number of components, it is necessary to mold expensive high-performance materials with high precision. Therefore, if cost performance is important, reducing the number of components is not always a good solution. is not.

  On the other hand, when emphasizing the reliability of the check valve operation and the stability of the water system, a filter is provided in the through-hole 71 of the external pressurizing means 7, the lower end of the check valve case flow path, etc. An embodiment in which foreign matter and adhesive particles do not adhere to the portion or the vicinity thereof is also desirable.

DESCRIPTION OF SYMBOLS 1 Mover 2 Packing 3 Fixed part 31 Upper end restricting part 4 of fixed part Mover push-up spring
5 Check valve case
6 Sealing part (consisting of three elements: moving element, packing, and fixing part)
7 External pressure means 71 Through hole 72 of external pressure means Packing 8 Push-up spring for external pressure means

Claims (2)

In a check valve that includes a moving element in the fixed portion where the flow path is formed, the moving element moves due to pressure reduction in the flow path, and the flow path is in a flow state.
An external pressurizing unit that moves the moving element from the closed state to the flow state is provided . The external pressurizing unit has a through hole inside, and the amount of gas flowing through the flow path is set by the diameter of the through hole. check valve, characterized in that that.   The check valve according to claim 1, wherein the flow path is closed by sandwiching a packing between the fixed portion and the moving element.

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