JPH0616786U - Slowly closed check valve - Google Patents

Abstract

(57) [Summary] [Purpose] A braking force is applied only when the valve body 5 is operating in the closing direction to slowly close it, and external resistance is eliminated when the valve body 5 is operating in the opening direction, so that the valve body 5 is quickly opened. It enables operation, eliminates the need for cumbersome oil changes, and does not require regular maintenance to facilitate management. [Structure] One-way clutch 4 attached to valve shaft 3
0A, a power transmission mechanism 40 including a first gear 40B that functions as an output gear of the one-way clutch 40A and a second gear 40C that meshes with the first gear 40B and an input gear 41A that meshes with the second gear 40C. A loose closing device 4 constituted by a key 41 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gradual close check valve having a gradual valve closing function.

[0002]

[Prior art]

 The conventional slowly closed check valve is configured as shown in FIG. That is, the slow-close check valve 1 swings together with the valve shaft 3 in a substantially vertical fully closed posture that blocks the flow path of the valve box 2 and a fully opened posture that is rotated upward from here. The valve body is opened at an opening degree corresponding to the pressure (flow rate) of the forward direction fluid indicated by arrow A, and the valve body's own weight or the valve body's own weight and the reverse direction fluid shown by arrow B are By cooperation, it is configured to rotate downward to swing back to the fully closed posture, and to connect the slowly closing device 4 to the valve shaft 3 to cause the valve closing operation gently. .

However, the conventional slow-closing device 4 includes a dash pot 4A containing oil, a piston 4B fitted in the dash pot 4A so as to be able to move up and down, and an arm 4C connecting the piston 4B and the valve shaft 3. Therefore, the slow closing device 4 operates during both the opening direction operation and the closing direction operation of the valve body. Therefore, there is a disadvantage that the resistance in the opening direction becomes large, which hinders the quick valve opening operation of the valve body, and it requires oil replacement and periodic maintenance, which makes it difficult to manage. is there.

[0004]

[Problems to be solved by the device]

 The problem to be solved is that the conventional slow-closing device hinders the rapid valve opening operation due to the large external resistance when the valve element operates in the opening direction, and also causes oil changes and regular maintenance. This is a troublesome point for management.

[0005]

[Means for Solving the Problems]

 The present invention relates to a check valve having a valve body that swings together with a valve shaft from a substantially vertical fully closed position that shuts off a flow path of a valve box and a fully opened position that is rotated upward from this position. A power transmission mechanism that is attached to a shaft and that idles when the valve body opens due to the forward flow of fluid, and a power transmission mechanism that rotates when the valve body closes due to its own weight or the reverse flow of fluid. It is characterized by the provision of a gradual closing device consisting of a centrifugal brake that receives the output.The braking force is applied only when the valve body is operating in the closing direction to slowly close it, and the valve element is operated in the opening direction. In some cases, the external resistance was eliminated to enable the valve body to open quickly, the need for cumbersome oil changes was eliminated, and the maintenance-free purpose was achieved.

[0006]

[Action]

 According to the present invention, when the valve body is closed, the power transmission mechanism rotates together with the valve shaft to transmit the output to the centrifugal brake and gradually increase the braking force to close the valve. On the other hand, when the valve body is opened, the power transmission mechanism idles, so there is no external resistance when the valve body operates in the opening direction. Therefore, the valve body can be quickly opened. That is, the responsiveness at the time of opening the valve is improved.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of a slowly closing check valve according to the present invention, and FIG. 2 is a perspective view showing a main part taken out. The same or corresponding parts as in FIG. explain. In FIGS. 1 and 2, the slowly closing check valve 1 swings together with the valve shaft 3 in a substantially vertical fully closed position that blocks the flow path of the valve box 2 and a fully opened position that is rotated upward from this position. A moving valve body 5 is provided, and the valve shaft 3 idles when the valve body 5 is opened by a forward direction fluid indicated by an arrow A, and the dead weight of the valve body 5 or the dead weight of the valve body 5 and a reverse direction indicated by an arrow B are shown. A power transmission mechanism 40 that rotates when the valve body 5 is closed by cooperation with a fluid is attached, and the output of the power transmission mechanism 40 is transmitted to a centrifugal brake 41 for braking. Is provided. That is, the power transmission mechanism 40 is a one-way clutch 40A that idles with respect to the valve shaft 3 when the valve body 5 is opened and rotates together with the valve shaft 3 when the valve body 5 is closed, and serves as an output gear of the one-way clutch 40A. The slow closing device 4 is constituted by a first gear 40B that functions and a second gear 40C that meshes with the first gear 40B, and the second gear 40C meshes with the input gear 41A of the centrifugal brake 41. There is.

With such a configuration, even if the valve body 5 is opened with the degree of opening corresponding to the pressure (flow rate) of the forward direction fluid indicated by the arrow A and the valve shaft 3 rotates in the direction of the arrow R1, The one-way clutch 40A idles due to its power cutoff characteristic, and the first gear 40B does not rotate. Therefore, there is no external resistance when the valve body 5 operates in the opening direction, and the valve body 5 can be opened quickly. That is, the responsiveness when the valve is opened can be improved. On the other hand, when the valve body 5 is closed by the dead weight of the valve body 5 or the cooperation of the dead weight of the valve body 5 and the backward fluid shown by the arrow B, when the valve shaft 3 rotates in the direction of the arrow R2, The first gear 40B rotates due to the power transmission characteristic of the A-clutch 40A. This rotation is transmitted to the input gear 41A of the centrifugal brake 41 via the second gear 40C, and the braking force of the centrifugal brake 41 is gradually increased to slowly close it.

As described above, when the valve body 5 is closed, the one-way clutch 40A, the first gear 40B, and the second gear 40C rotate together with the valve shaft 3, and the output thereof is input to the input gear 41A of the centrifugal brake 41. To gradually close the braking force by gradually increasing the braking force, and when the valve body 5 is opened, the one-way clutch 40A idles idle to eliminate external resistance, thereby promptly opening the valve body 5. It is possible to improve the response when opening the valve. Moreover, with the loose closing device 4 of the present invention, troublesome oil changes are unnecessary and regular maintenance is also unnecessary, so management is extremely easy.

[0010]

[Effect of device]

 INDUSTRIAL APPLICABILITY The present invention eliminates the external resistance when the valve body is closed to enable the valve body to open quickly, improve the responsiveness when the valve body is opened, and slowly close the valve body when it is closed. It can be performed reliably, and it eliminates the need for cumbersome oil changes and does not require regular maintenance, which simplifies management.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of a slowly closing check valve according to the present invention.

FIG. 2 is a perspective view showing a main part taken out.

FIG. 3 is an overall perspective view showing a conventional slowly closing check valve.

[Explanation of symbols]

 1 Slowly Closed Check Valve 2 Valve Box 3 Valve Shaft 4 Slow Closing Device 5 Valve Body 40 Power Transmission Mechanism 41 Centrifugal Brake

Claims (1)

[Scope of utility model registration request] 1. A check valve provided with a valve body that swings together with a valve shaft from a substantially vertical fully closed position that shuts off a flow path of a valve box and a fully open position that is rotated upward from this position,
A power transmission mechanism attached to the valve shaft and idling when the valve body opens due to a forward flow of fluid, and a power transmission mechanism that rotates when the valve body closes due to its own weight or a reverse flow of fluid. A slow-close check valve provided with a slow-close device configured with a centrifugal brake that receives the output of.