JPH0635748U - Check valve with limit switch - Google Patents

Abstract

(57) [Abstract] [Purpose] Solves problems such as increased man-hours associated with installing both a check valve and a flow switch in piping, and the occurrence of scale accumulation problems due to the use of a check valve. To provide a check valve with limit switch. [Structure] Housing 1 having inlet 3 and outlet 5
And is installed in the housing 1 and normally blocks the inflow port 3 and the outflow port 5 and operates by the action of the fluid pressure from the inflow port 3 side to open the space between the inflow port 3 and the outflow port 5. Valve body 7 and a valve body 7 attached to the housing 1 or the valve body 7
Limit switch 11 which is turned on and off by the operation of
It is equipped with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve with a limit switch, and in particular, a limit switch is integrally attached to the check valve to reduce man-hours and to detect the operating state of the check valve. Regarding devised ones.

[0002]

[Prior art]

 For example, as shown in FIG. 2, in various piping facilities, a check valve 103 and a flow switch 105 are inserted in the middle of the piping 101. The check valve 103 includes a housing 107, and an inflow port 109 and an outflow port 111 are formed in the housing 107. Further, a valve body 113 is mounted in the housing 107 so as to be rotatable around its one end as a fulcrum.

When there is no flow of fluid, the valve body 113 is rotated further from the state shown by the solid line in the figure to the left side in the figure to close the inlet 109. On the other hand, when a fluid flow is generated, it is rotated by the pressure to be in the state shown by the phantom line in the figure, whereby the flow from the inflow port 109 toward the outflow port 111 is allowed. Further, the flow of the fluid in the opposite direction is prohibited because the valve body 113 is rotationally biased in the direction of closing the inflow port 109. The flow switch 105 detects that a fluid is flowing in the pipe 101, and outputs a signal when the water is cut off, for example.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional configuration has the following problems. First, both the check valve 103 and the flow switch 105 have to be attached to the pipe 101, and there has been a problem that the man-hours increase accordingly. Further, in the case of the check valve 103, a scale (eg, a rotating operation of the valve body 113 is impaired) may occur due to accumulation of scale or the like, but there is a problem that it cannot be detected promptly. It was

The present invention has been made on the basis of such a point, and an object of the present invention is to eliminate the above-mentioned problems by integrally mounting a limit switch on a check valve. It is to provide a check valve with a limit switch.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a check valve with a limit switch according to the present invention comprises a housing having an inflow port and an outflow port, and is installed in the housing and normally shuts off the inflow port and the outflow port. The valve body that operates by the action of the pressure of the fluid from the side to open the space between the inlet and the outlet, and the flow of the fluid that is attached to the housing or the valve body based on the operation of the valve body It is characterized by including a limit switch for detecting the presence or absence.

[0007]

[Action]

 In the case of the present invention, the limit switch is integrally attached and is configured to be turned on / off by the operation of the valve body. Therefore, the limit switch can function as a flow switch without separately mounting a flow switch. In addition, the operation of the valve element and thus the soundness of the check valve can be detected through the limit switch.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view showing the structure of a check valve with a limit switch according to the present embodiment. First, there is a housing 1. The housing 1 is formed with an inflow port 3 into which a fluid flows and an outflow port 5 from which the inflowing fluid flows out. A valve body 7 is mounted on the inflow port 3 side in the housing 1 so as to be rotatable around a fulcrum 9.

The valve body 7 is constantly urged to rotate toward the inflow port 3 by a spring member (not shown), and is in a state shown by a solid line in the figure when there is no fluid flow. That is, the inflow port 3 side and the outflow port 5 side are blocked. On the other hand, when the fluid circulates and the pressure acts, the valve body 7 is urged to rotate counterclockwise in the drawing against the urging force of the spring member, as shown by the phantom line in the drawing. It becomes a state. This allows fluid flow. When a reverse flow is applied, the pressure urges the valve element 7 to rotate clockwise in the figure, and the state shown by the solid line in the figure is reached. Therefore, the reverse flow of fluid is prohibited.

A limit switch 11 is integrally attached to the check valve having the above structure. When the valve body 7 is in the state shown by the solid line in the figure, it is turned on. On the other hand, when the valve body 7 shifts from the state shown by the solid line to the state shown by the phantom line, it turns off. That is, it is turned on when the fluid flow is not generated, and is turned off when the fluid flow is generated. That is, the limit switch 11 functions as a flow switch. Also, by turning on / off the limit switch 11, it is possible to detect the soundness of the check valve.

The present invention is not limited to the above-mentioned one embodiment. For example, the place where the limit switch 11 is mounted is not limited to that shown in the figure, and may be arbitrarily set in consideration of the valve body 7. Further, the relationship between the operating state of the valve body 7 and the on / off state of the limit switch 11 may be set arbitrarily. For example, contrary to the case of the one embodiment, a fluid flow is generated. It may be turned off when there is no such flow, and may be turned on when fluid flow is occurring.

[0012]

[Effect of device]

 As described above in detail, according to the check valve with limit switch of the present invention, the limit switch is integrally attached to the check valve, so that the limit switch can be used as a flow switch without installing a separate flow switch. Therefore, even when it is attached to the piping group, the number of steps can be reduced by the amount of the flow switch. Also, since the operating state of the check valve can be recognized from the state of the limit switch, it is possible to check the soundness of the check valve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a check valve according to an embodiment of the present invention.

FIG. 2 is a view showing a conventional example showing a check valve and a flow switch.

[Explanation of symbols]

 1 Housing 3 Inlet 5 Outlet 7 Valve body 11 Limit switch

Claims (1)

[Scope of utility model registration request] 1. A housing having an inflow port and an outflow port, which is installed in the housing and normally blocks the inflow port and the outflow port, and operates by the action of fluid pressure from the inflow port side. A valve body that opens between the inlet and the outlet,
A check valve with a limit switch, comprising: a limit switch attached to the housing or the valve body to detect the presence or absence of the flow of the fluid by turning on and off based on the operation of the valve body.