JPH0366527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flow path switching device used for housing equipment such as hot water supply and space heating, and fluid application equipment such as sprinklers and cleaning equipment.

BACKGROUND ART Conventional flow path switching devices of this type have two solenoid valves installed in parallel or a single valve body 22 as shown in FIG.
Two electromagnetic coils 23 and 24 are arranged on the top, and the electromagnetic coils 23 and 24 are controlled separately, and the flow path 2
5, 26 switching control was performed.

Problems to be Solved by the Invention However, with the above configuration, water hammer may occur due to imbalance during switching control, for example, simultaneous closing of solenoid valves, which may damage equipment. In addition, there are other problems, such as the need for two solenoid valves and their control circuits, and the dedicated design of the valve device, resulting in high costs.

The present invention solves these conventional problems, and even when two channels are switched, there is little pressure fluctuation in the channel system, and the channel switching is performed reliably.
Furthermore, the purpose is to share parts between a three-way valve that switches two channels and a two-way valve that opens and closes one channel.

Means for Solving the Problems In order to solve the above problems, the flow path switching device of the present invention has a first on-off valve, an external drive means for driving the first on-off valve, and an external driving means for driving the first on-off valve. A first flow path that is opened and closed by a valve, and a first flow path that communicates with the first flow path.
A first flow path structure, which is composed of an outlet, a pressure chamber whose pressure changes by opening and closing of the first on-off valve, and a diaphragm valve which is actuated by pressure changes in the pressure chamber, and which is detachably connected to the external driving means. an inlet communicating with the first channel, a second channel communicating with the inlet and opened and closed by the diaphragm valve or the first on-off valve, and a second outlet communicating with the second channel. The second flow path structure is detachably connected to the external driving means when the valve is a two-way valve, and to the first flow path structure when the valve is a three-way valve.

Effects According to the present invention, with the above configuration, when the first on-off valve is opened by the external driving means, the first flow path is brought into communication.
When the first flow path is communicated, pressure downstream of the first on-off valve acts on the diaphragm valve, the second on-off valve is closed, and the second flow path is placed in a non-communicating state.

Next, when the first on-off valve is closed by the external driving means,
The first channel is in a non-communicating state. As a result, the first flow path becomes a non-communicating state, the pressure downstream of the first on-off valve decreases, and the second on-off valve is opened by the upstream pressure on the flow path.
The second flow path is brought into communication. As described above, two flow paths can be switched with one on-off valve that is opened and closed by an external drive means.

Moreover, if the first flow path structure is removed and the external driving means structure and the second flow path structure are stacked, a two-way valve is obtained. In this case, the first
The on-off valve is opened and closed.

Embodiment The embodiment of the flow path switching device of the present invention is shown in FIG.
This will be explained based on FIG.

1 is an external driving means, 2 is a first flow path structure, and 3 is a second flow path structure. The external drive means 1 is composed of an electromagnetic coil 4, a plunger 7 having a valve body 5 attached to its tip, and biased by a spring 6. The first flow path structure 2 includes a first on-off valve 11 consisting of a first flow path 8, a first outflow path 9, and a valve seat 10 for the valve body 5, and a downstream pressure of the first on-off valve 11. The pressure receiving chamber 12 is introduced into the pressure receiving chamber 12. The second flow path structure 3 includes an inflow path 13 and a second flow path 1
4, a second outflow passage 15, and a valve seat 17 for a diaphragm valve 16. 18 is a spring that biases the diaphragm valve 16 in the closing direction;
9 is an inlet, 20 is a first outlet, and 21 is a second outlet.

In the above configuration, when the electromagnetic coil 4 of the external drive means 1 is energized, the plunger 7 is moved by the spring 6
The valve body 5 is opened by being pressed upward against the force. As a result, the flow flowing in from the inflow channel 13 is transferred to the inlet 1
9, enters the first flow path 8, passes through the valve seat 10 of the first on-off valve 11, and flows from the first outlet 20 to the first flow path 9.
Flowing towards. On the other hand, the pressure downstream of the valve seat 10 of the first on-off valve 11 is transmitted to the pressure receiving chamber 12 and presses the diaphragm valve 16 downward to close the flow path. As a result, the flow in the second flow path 14 stops.

Conversely, when the electromagnetic coil 4 of the external drive means 1 is de-energized, the plunger 7 is pressed downward by the urging force of the spring 6 and gravity, and the flow path is closed by the valve body 5. As a result, the flow flowing in from the inlet passage 13 enters the second passage 14 , pushes up the diaphragm valve 16 , passes the valve seat 17 , and flows from the second outlet 21 toward the second outlet passage 15 . In this case, since the first on-off valve 11 is closed, the fluid pressure in the pressure receiving chamber 12 decreases, and the diaphragm valve 1
6 is easily pushed up by the fluid pressure in the second flow path 14.

Next, as shown in FIG.
When the external drive means 1 and the second flow path structure are removed and the electromagnetic coil 4 of the external drive means 1 is energized, the plunger 7 is pushed upward against the spring 6 and the valve body 5 will be opened. As a result, the flow that has flowed in from the inflow path 13 enters the second flow path 14 through the inflow port 19, flows between the valve body 5 and the valve seat 17, and is directed from the second outflow port 21 to the second flow path 15. flows.

Conversely, when the energization to the electromagnetic coil 4 of the external drive means 1 is stopped, the plunger 7 is pressed downward by the urging force of the spring 6 and gravity, the flow path is closed by the valve body 5, and the flow in the flow path is stopped. . That is, it functions as a two-way valve.

Effects of the Invention As described above, according to the flow path switching device of the present invention,
The following effects can be obtained.

(1) External driving means including the first flow path structure, the second
When the three components of the channel structure are laminated,
It becomes a three-way valve that switches between two flow paths, and when the first flow path structure is removed and the external drive means and the second flow path structure are stacked in two layers, it becomes a two-way valve that opens and closes the flow path. I can do it. As a result, parts can be shared and costs can be significantly reduced.

(2) When used as a three-way valve that switches between two flow paths, the diaphragm valve is opened and closed by the pressure generated when the first on-off valve is opened and closed. Therefore, simultaneous complete closure of the branch channels does not occur,
Water hammer can be prevented and equipment inserted into the piping system can be prevented from being damaged.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flow path switching device according to an embodiment of the present invention, FIG. 2 is an external perspective view of the same flow path switching device, and FIG. 3 is a first flow path structure of the same flow path switching device. A sectional view of the removed two-way valve, and FIG. 4 is a sectional view of a conventional flow path switching device. 1... External drive means, 2... First flow path structure,
3... Second channel structure, 8... First channel, 9...
1st outflow path, 12...pressure receiving chamber, 13...inflow path,
14...Second channel, 15...Second outflow channel, 16...
...Diaphragm valve.

Claims (1)

[Claims] 1 having a first on-off valve, an external driving means for driving the first on-off valve, a first flow path opened and closed by the first on-off valve, a first outlet communicating with the first flow path; a first channel structure, which is composed of a pressure chamber whose pressure changes by opening and closing a first on-off valve, and a diaphragm valve which is actuated by the pressure change in the pressure chamber, and which is detachably connected to the external driving means; 1
an inlet that communicates with a flow path; a second flow path that communicates with the inlet and is opened and closed by the diaphragm valve or the first on-off valve; and a second outlet that communicates with the second flow path; A flow path switching device comprising a second flow path structure that is removably connected to the external driving means when the valve is a two-way valve, and to the first flow path structure when the valve is a three-way valve.