JPH067234Y2 - Water flow switching device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention connects to a water-using device having a water circulation path inside to switch the water flow in the water circulation path between normal and reverse directions. When switching, the water is temporarily leaked and then switched to prevent the water hammer effect.

[Conventional technology]

There are a wide variety of water-using devices with water circulation paths, such as molds with cooling water circulation paths and various heat exchangers, and these water-using devices circulate water from the water inlet to the outlet. There is.

[Problems to be solved by the device]

However, in the above-mentioned prior art, since the flow direction of water in the water using device is only one direction from the inlet to the outlet, the stepped portion of the joint or other bent portion in the water circulation path. At the time, impurities such as scale adhere,
There is a problem that this is accumulated and the circulation path is narrowed.
Also, the water-using device is a heated device such as a mold,
If a cooling water circulation path for cooling the cooling water is formed inside the cooling water, the cooling water is sufficiently cooled near the inlet, but the cooling water is heated gradually as it approaches the outlet. There was also a problem that it could not be cooled properly. In the case of a device that is heated inversely by circulating water, this is the same as that near the inlet is sufficiently heated, but near the outlet is insufficiently heated.

This invention is intended to solve the above-mentioned conventional inconvenience by switching the flow direction of water in a water-using device, but it is used in a hydraulic device in order to switch the water flow direction. If a directional control valve similar to the 4-port 2-position directional control valve is used, there is a new problem that a water hammer effect occurs due to a sudden change in the water flow when switching between normal flow and reverse flow.

Therefore, the present invention has been devised for the purpose of switching the flow direction of water in the water-using device between normal and reverse directions and preventing the water hammer effect at the time of switching.

[Means for Solving the Problems]

This invention is characterized in that the valve body has an inlet continuous with a water supply source,
An outlet through which water that has entered from the inlet is continuously discharged to a water discharge destination, and first and second inlets and outlets that communicate with these inlets and outlets and that are continuous with a water-using device through which the water passes , An inlet-side selection valve that selects the direction of the water flow entering from the inlet to the first inlet / outlet, the second inlet / outlet, or both, and a passage for the water flow toward the outlet. An outlet-side selection valve that selects one of the first inlet / outlet port and the second inlet / outlet port;
When selecting the inlet / outlet of the inlet side selection valve, the outlet side selection valve is the second
Switching both selection valves between a forward flow mode in which the inlet / outlet is selected and a reverse flow mode in which the outlet side selection valve selects the first inlet / outlet when the second inlet / outlet of the inlet side selection valve is selected, and during the switching between both modes. In addition, the water flow switching device is characterized in that both selection valves are provided with an opening / closing switching mechanism that switches to a leak mode that selects both the inlet and outlet.

[Action]

Water from a water supply enters the inlet of the water flow switching device, and the water is supplied from one of the first and second inlets and outlets of the water-using device.
It is supplied to one of the two inlets and outlets, circulates there and performs a predetermined task such as heat exchange, then exits from the other inlet and outlet of the water using device and enters the other inlet and outlet of the water flow switching device, and this water is further flow switched. Exit from the device.

Here, when the inlet-side selection valve selects the first inlet / outlet and the outlet-side selection valve selects the second inlet / outlet by the opening / closing switching mechanism to enter the forward flow mode, the water entering from the inlet of the water flow switching device is The water is supplied from one inlet to one of the outlets of the water using equipment, circulates in the water using equipment, enters the second inlet of the water flow switching device from the other inlet, and further flows out from the outlet.

Next, when the inlet-side selection valve selects the second inlet / outlet by the open / close switching mechanism to set the reverse flow mode, the open / close switching mechanism changes the forward flow mode to the leak mode and then to the reverse flow mode. In this leak mode, the inlet side selection valve and the outlet side selection valve make the inlet, the outlet, the first outlet and the second inlet communicate with each other, so that the water entering the valve body from the inlet has the shortest distance. There is no movement of water between the valve body and the equipment using water by passing through and exiting the valve body from the outlet.

When the leak mode is followed by the reverse flow mode, the water entering from the inlet of the water flow switching device is supplied from the second inlet / outlet to the inlet / outlet that was the outlet in the forward flow mode of the water using device, and enters the water using device from here. , The water circulating device circulates through the other inlet / outlet, enters the first inlet / outlet of the water flow switching device, and further flows out of the outlet.

Thus, in the forward flow mode and the reverse flow mode, the first and second
The direction of water inflow and outflow at the entrance and exit is reversed, and the direction of water flow in the water using equipment is reversed, and the water inlet and outlet so far are reversed in the water using equipment.

For this reason, impurities such as scale accumulated due to steps and bends in the circulation path are removed by the water flow in the opposite direction and discharged to the outside of the water-using device. Therefore, this may be removed by providing a filter outside the device. Even when the water-using device is cooled or heated by water, the temperature of the circulation path becomes uniform by reversing the inlet and outlet of the water, and therefore the cooling or heating becomes uniform. Done.

Moreover, in the leak mode, water from the inlet leaks to the outlet, so that there is no water flow in the water-using device, so that forward / reverse switching is not instantaneously switched during forward / reverse switching, thus preventing a water hammer effect. be able to.

〔Example〕

FIG. 1 is an explanatory view showing the outline of the present invention, in which a water flow switching device 1 is connected to a water using device 2 to form a reciprocating circulation device 10. The water flow switching device 1 is
In the valve body (not shown in FIG. 1), an inlet 4 that is continuous to the water supply source 3 via the pump P, an outlet 5 that is continuous to the water discharge destination (here, returns to the supply source 3), and these inlets 4 And a first inlet / outlet 6 and a second inlet / outlet 7 which communicate with the outlet 5 and are continuous with the water using device 2. A filter 8 is interposed between the outlet 5 and the supply source 3. The pump P may be at another position as long as it can obtain a water pressure for a water flow described later.

In this figure, a first opening / closing valve 11 for opening / closing the inlet 4 and the first inlet / outlet 6 is interposed, and a first opening / closing valve 11 for opening / closing the first inlet / outlet 6 and the outlet 5 is provided. A second on-off valve 12 is interposed, a third on-off valve 13 for opening and closing the inlet 4 and the second inlet / outlet 7 is interposed, and further, between the second inlet / outlet 7 and the outlet 5. There is a fourth opening / closing valve 14 for opening and closing the valve.

The first opening / closing valve 11 and the third opening / closing valve 13 select the direction of the water flow entering from the inlet 4 to the first inlet / outlet 6, the second inlet / outlet 7, or both 6 and 7 thereof. The inlet side selection valve A is configured. The second on-off valve 12 and the fourth
The on-off valve 14 constitutes an outlet-side selection valve B that selects one of the first inlet / outlet 6, the second inlet / outlet 7, and both 6 and 7 as a passage for the water flow toward the outlet 5. is doing.

The opening and closing of the first and fourth on-off valves 11 and 14 and the second and third on-off valves 12 and 13 have mutually opposite phases, and the on-off operations of the on-off valves 11 to 14 are synchronized. ing. The open / close switching mechanism 9 performs the synchronizing operation in the opposite phase.

The first inlet / outlet 6 and the second inlet / outlet 7 of the water flow switching device 1 are individually connected to the first inlet / outlet 16 and the second inlet / outlet 17 formed at both ends of the water circulation path 15 in the water using device 2. ing.

Thus, the water that has entered the inlet 4 of the water flow switching device 1 from the supply source 3 is opened by the first opening / closing valve 11 and the fourth opening / closing valve 14, and by the second opening / closing valve 12 and the third opening / closing valve 13. When closed, the inlet side selection valve A selects the first inlet / outlet 6 and the outlet side selection valve B selects the second inlet / outlet 7, and the water flows as follows. That is, the water enters the first inlet / outlet 16 of the water-using device 2 from the first inlet / outlet 6, circulates in the circulation path 15 in the direction of the arrow a and exits from the second inlet / outlet 17, and then to the second inlet / outlet 7 of the directional control valve 1. It exits from the inlet / outlet 5 and returns to the source 3 via the filter 8.

Here, the opening and closing of the first to fourth on-off valves 11 to 14 is reversed, and the inlet side selection valve A selects the second inlet / outlet 7 and the outlet side selection valve B selects the first inlet / outlet 6. In the reverse flow mode, water flows out from the second inlet / outlet 7 of the water flow switching device 1 into the second inlet / outlet 17 of the water using device 2, circulates in the direction of the arrow b, and flows from the first inlet / outlet 16 to the directional control valve 1. Take the first entrance 6 and then exit 5.

Therefore, the switching direction of each of the open / close valves by the open / close switching mechanism 9 reverses the circulation direction of the water using device 2 in the circulation path 15.

During the switching between the normal flow mode and the reverse flow mode, the water enters the leak mode during the switching and enters through the water inlet 4 and then exits through the water outlet 5. At this time, water does not reciprocate in the water using device 2. Therefore, the water hammer effect due to the switching is eliminated or the impact is reduced.

2 to 4 show a first embodiment of the water flow switching device 1, in which horizontal holes 22 and 23, which are parallel to the inside, are respectively opened from an inlet 4 and an outlet 5 with a taper screw formed in a valve body 21 toward the inside. ,
These two horizontal holes 22 and 23, vertical holes 2 parallel to each other
4 and 25 communicate with each other, and these vertical holes 24 and 25 have a first inlet / outlet 6 with a taper screw that is open to the outside of the valve body 21.
And the second doorway 7 communicate with each other.

A first opening / closing valve 11 is provided between the horizontal hole 22 and the vertical hole 24. The first opening / closing valve 11 is a valve seat 11a fixed to a valve body 21 in this embodiment, and a forward / backward movement thereof. Then, the valve body 11b is attached and detached. The second opening / closing valve 12 is provided between the vertical hole 24 and the horizontal hole 23.
A third opening / closing valve 13 is provided between the vertical opening 2 and the vertical opening 2
A fourth on-off valve 14 is provided between the 5 and the lateral hole 23. The respective on-off valves 12, 13, 14 are also the first on-off valve 11
Similarly, it is composed of a valve seat and a valve body.

The first opening / closing valve 11 and the third opening / closing valve 13 constitute an inlet side selection valve A as in the case of FIG. 1, and the second opening / closing valve 12 and the fourth opening / closing valve 14 constitute an outlet side selection valve B. is doing.

The valve bodies 11b and 12b are fixed at their upper ends to a lift shaft 26 projecting above the valve body 21, and when the valve body 11b rises, the second on-off valve 12 closes and the first on-off valve 11 opens, and when it descends. The first opening / closing valve 11 is closed and the second opening / closing valve 12 is opened. Further, the other valve bodies 13b and 14b are fixed to the lifting shaft 27 similar to the above, and by the rise thereof, the fourth opening / closing valve 14 is closed and the third opening / closing valve 13 is opened, and by the lowering thereof, these opening / closing operations are reversed. I am doing it.

When the elevating shafts 26 and 27 are at intermediate positions in the ascending / descending direction, the on-off valves 11 to 14 are in a state in which they are about half opened, that is, the inlet side selection valve A and the outlet side selection valve B are the inlet 4 and the outlet 5 , The first inlet / outlet 6 and the second inlet / outlet 7 are communicated with each other, and the lateral holes 22 and 23 are formed in the valve body 21.
Then, the inlet 4 and the outlet 5 communicate with each other through the vertical holes 24 and 25 between them, and the leak mode described above is established.

Cylinder devices 28 and 29 are connected to the upper ends of the elevating shafts 26 and 27 on the upper side of the valve body 21, respectively, so that the elevating shafts 26 and 27 are driven up and down. Further, the raising and lowering drive is such that the raising and lowering of both the raising and lowering shafts 26 and 27 are in the opposite phase and they are raised and lowered in synchronization. The up / down switching cycle can be automatically set at a preset value, or manually switched.

Thus, the lifting shafts 26 and 27 and the cylinder device 2
The open / close switching mechanism 9 is constituted by 8 and 29. The opening / closing switching mechanism 9 has the first opening / closing valve 11 and the fourth opening / closing valve 14, and the opening / closing of the second opening / closing valve 12 and the third opening / closing valve 13 in mutually opposite phases, and the opening / closing operation of each of these opening / closing valves. Other configurations can be adopted as long as they are synchronized. Therefore, in this embodiment, if the elevating shafts 26 and 27 are advanced and retracted as described above, the shafts 26 and 27 may be connected to a drive source through a known mechanical element such as a link mechanism. It is possible.

This water flow switching device 1 moves the elevating shafts 26 and 27 up and down in synchronism with the opposite phases and in synchronization with each other by the operation of the cylinder devices 28 and 29, so that the directional switching valve 1 shown in FIG. Each on-off valve 11-14 opens and closes. Therefore, the inlet 4 and the outlet 5 are always the same, but the water flow in the first inlet / outlet 6 and the second inlet / outlet 7 is switched, and the water flow in the circulation path 15 of the water using device 2 connected thereto is changed. The leak mode is switched between the forward flow direction and the reverse flow mode, and the leak mode appears between the forward flow mode and the reverse flow mode.

5 to 10 show a second embodiment of the water flow switching device 1.

This water flow switching device 1 includes a circular chamber 3 with a constant width in a valve body 21.
1, 32 are formed in parallel and concentrically, the inlet 4 continuous from the upper end of the circular chamber 31 opens on the upper surface of the valve body 21, and the outlet 5 continuous from the upper end of the circular chamber 32 also opens on the upper surface of the valve body 21. There is. The circular chamber 31 has passages 31a and 31b.
Are continuous independently, and the circular chamber 32 also has passages 32a, 3a.
2b are continuous independently, and these passages 31a and 32a communicate with the second inlet / outlet 7 by the passage 33,
2b communicates with the first doorway 6 through the passage 34. The first inlet / outlet 6 and the second inlet / outlet 7 are opened on the front surface of the valve body 21. Both the inlets and outlets 6 and 7 are connected to the water using device 2, which is the same as the first embodiment.

The circular chamber 31 is rotatably equipped with an inlet-side selection valve A that selects the direction in which the water flowing from the inlet 4 exits the circular chamber 31 from one of the passages 31a and 31b or both modes. The circular chamber 32 is rotatably equipped with an outlet-side selection valve B that is selected from three modes of either one or both of the channels 32a and 32b as a channel for receiving water toward the outlet 5. Both circular chambers 31, 32 and both selection valves A,
Although not shown in the figure with B, a watertight structure is formed by interposing packing or the like.

The inlet side selection valve A and the outlet side selection valve B are positioned so as to be opposite to each other in this embodiment, and when the inlet side selection valve A shuts off between the inlet 4 and the passage 31a, the outlet side selection valve A The selection valve B shuts off between the outlet 5 and the passage 32b (normal flow mode), and when the inlet side selection valve A shuts off between the inlet 4 and the passage 31b, the outlet side selection valve B is connected to the outlet 5 and the passage. 32
It is cut off from a (reverse flow mode), and the inlet side selection valve A
When the inlet 4 communicates with both passages 31a, 31b, the outlet side selection valve B also communicates the outlet 5 with both passages 32a, 32b (leak mode). Both selection valves A and B
Is connected to a rotary shaft 35 extending outside the valve body 21 so as to rotate integrally therewith, and is rotated by a rotary drive source (not shown) connected to the rotary shaft 35. The rotary shaft 35 and the rotary drive source constitute the open / close switching mechanism 9. The rotating shaft 35 may rotate in the same direction to make the selection,
It may also be reciprocally rotated.

Thus, in this embodiment, the mode shown in FIG. 8 is the forward flow mode, and the water that has entered the circular chamber 31 from the inlet 4 is used from the first inlet / outlet 6 after the passage 31b is selected by the inlet side selection valve A. After being supplied to the device 2 and circulated there, it enters the circular chamber 32 from the second inlet / outlet 7 via the passage 32a, and is guided to the outlet 5 by the outlet side selection valve B, where the water flow switching device 1 is provided.
Get out of.

When the inlet-side selection valve A and the outlet-side selection valve B are rotated 180 degrees by the rotation of the rotary shaft 35, the reverse flow mode shown in FIG. 9 is set, and the water that has entered from the inlet 4 passes through the passage 31a to the second inlet / outlet port. 7 is supplied to the water using device 2, and after circulating there, enters the circular chamber 32 from the first inlet / outlet 6 via the passage 32b, and then exits from the water flow switching device 1 via the outlet 5. Therefore, in the normal flow mode of FIG. 8 and the reverse flow mode of FIG. 9, although the water inlet 4 and the water outlet 5 to the water flow switching device 1 are the same, the direction of the water circulating in the water using device 2 is The opposite is true.

At the time of switching between the forward flow mode and the reverse flow mode,
When the rotation angle between the inlet side selection valve A and the outlet side selection valve B rotates to an intermediate angle between the normal and reverse modes, as shown in FIG. 31
a, 31b, and inside the circular chamber 32, both passages 32a,
Enter through 32b and exit through exit 5. Therefore, the first
Since water is similarly supplied to the inlet / outlet 6 and the second inlet / outlet 7, the water is not circulated in the water using device 2, the water flow is temporarily stopped, and the water entering from the inlet 4 into the valve body 21 is water. It does not flow into the used device 2 and leaks to the outlet 5. in this way,
Since the normal flow and the reverse flow are not immediately switched but the water in the water using device 2 is stopped, the degree of change in the water flow is moderated and the water hammer effect is prevented.

[Effect of device]

As described above, according to the present invention, by switching the valve while the inlet and the outlet of the water flow switching device are specified, the flow direction of water in the water using device connected to this can be converted into forward and reverse directions. can do. For this reason, impurities such as scale accumulated due to steps and bends in the water circulation equipment inside the water use equipment are removed by the reverse water flow and discharged to the outside of the water use equipment. Can be prevented. Also, when the water-using device is cooled or heated by water, the temperature of the circulation path is made uniform by reversing the inlet and outlet of the water and thus cooling or cooling the water-using device. There is also an effect that heating is performed uniformly. Further, according to the present invention, in the leak mode, the water stagnates in the equipment using the water, so that the water flow direction is not instantaneously switched to the normal direction. Therefore, there is also an effect that the water hammer effect can be prevented and damage to various types of water-using equipment can be prevented.

[Brief description of drawings]

1 is an explanatory view of the outline of the present invention, FIG. 2 is a longitudinal sectional view of the first embodiment, FIG. 3 is a front view from the opposite direction to FIG. 2, and FIG.
FIG. 5 is a side view of the same, FIG. 5 is a plan view of the second embodiment, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 5 is an explanatory view of the action of the forward flow mode in FIG. 5, FIG. 9 is an explanatory view of the action of the reverse flow mode, and FIG. 10 is an explanatory diagram of the action of the leak mode. A ... Inlet side selection valve, B ... Outlet side selection valve, 1 ... Water flow switching device, 2 ... Water using device, 3 ... Supply source, 4 ... Inlet, 5 ... Outlet, 6 ... 1 gateway, 7 ... second gateway, 8 ... filter, 9 ... open / close switching mechanism, 11 ... first
On-off valve, 12 ... second on-off valve, 13 ... third on-off valve, 1
4 ... 4th on-off valve, 15 ... circulation path, 16 ... 1st inlet / outlet, 17 ... 2nd inlet / outlet

Claims (1)

[Scope of utility model registration request] 1. An inlet connected to a water supply source in the valve body,
An outlet through which water that has entered from the inlet is continuously discharged to a water discharge destination, and first and second inlets and outlets that communicate with these inlets and outlets and that are continuous with a water-using device through which the water passes In the valve body, an inlet side selection valve that selects the direction of the water flow entering from the inlet to either the first inlet / outlet, the second inlet / outlet, or both, and An outlet-side selection valve that selects either the first inlet / outlet or the second inlet / outlet is provided, and the outlet-side selection valve is the second when the first inlet / outlet of the inlet-side selection valve is selected.
Switching both selection valves between both modes, a forward flow mode in which the inlet and outlet are selected, and a reverse flow mode in which the outlet side selection valve selects the first inlet and outlet when the second inlet and outlet of the inlet side selection valve is selected. A water flow switching device comprising an open / close switching mechanism that switches to a leak mode in which both selection valves select both inlets and outlets during the switching.