JPH0227261Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Purpose of the invention (technical field of industrial application) The invention relates to a switching valve that is used in various devices and switches the flow path of gas or liquid.

(Prior Art) In a switching valve that switches a flow path by a combination of a stator and a rotor, positioning has conventionally been performed using a stopper.

(Problems to be Solved by the Invention) Therefore, in the positioned state, the drive shaft of the rotor is always under load. Therefore, an object of the present invention is to provide a switching valve equipped with a positioning means that does not impose a load on the drive shaft or the like.

(b) Structure of the invention (means for solving problems) In a switching valve in which flow paths are switched by a stator and a rotor, the stator has two sets of actuator drive flow paths (hereinafter referred to as , a drive flow path), and each drive flow path has a fluid inlet/output flow path, a flow path connected to an actuator, and a discharge flow path, and the rotor is connected to a drive shaft of the actuator. The rotor is provided with grooves that form flow passages with the two sets of drive passages of the stator in addition to the switching passages, and the grooves are configured to rotate the stator by rotation of the rotor. A state in which one flow path is formed between the fluid inlet/output flow path of each set of driving flow paths and the flow path connected to the actuator, and
In one set of driving channels, between the fluid inlet/output channel and the channel connected to the actuator, and in the other set of driving channels, between the channel connected to the actuator and the discharge channel. are provided at angular positions that form one flow path in each.

FIG. 1 is a diagram schematically representing the present invention,
1 is a stator, 2 is a rotor, and this set constitutes a switching valve for sample gas and other target fluids. However, the flow paths for switching the sample gas and other fluids are not shown, and only the driving flow paths for driving the actuator are shown. The same applies below.

Reference numeral 3 denotes a rotary actuator driven by fluid, such as an air type rotary actuator, and the rotor 2 described above is attached to the drive shaft 4 of the rotary actuator. Reference numeral 11 denotes a solenoid valve that switches the flow direction of the actuator driving fluid, and is, for example, a four-way solenoid valve.

The stator 1 is provided with two sets of drive channels 5, 6 and 7, 8 for fluid ingress and egress, and one discharge channel (not shown) for each set. Grooves 9 and 10 are provided corresponding to the sets of drive channels. Each set of drive channels 6 and 8 of the stator 1 is connected to the actuator 3 to form one channel.

(Function) Now, when fluid for driving the actuator is introduced in the direction A by the solenoid valve 11, the flow path 5 → groove 9 → drive flow path 6 → actuator 3 →
The flow goes from drive flow path 8 → groove 10 → drive flow path 7, and the actuator 3 rotates in the direction a, rotating the rotor 2. When it rotates to a predetermined angular position, the flow path is cut off, and the rotation of the actuator 3 is stopped. Stop. The positional relationship between the stator 1 and the rotor 2 at this stop position is a position that forms one of the flow paths to be switched for the sample gas or other fluid.

Next, when the direction of the fluid for driving the actuator is switched to the B direction by the solenoid valve 11, a flow of fluid in the opposite direction to that described above occurs, and the actuator 3 rotates in the B direction, rotating at a predetermined angle. At this point, the flow path is cut off again and rotation stops. The positional relationship between the stator 1 and the rotor 2 at this stop position is a position where the other of the flow paths to be switched is formed.

In the present invention, the drive of the actuator 3 is stopped by blocking the flow path of the fluid that drives the actuator 3 at the surface of the rotor 2 depending on the relative positions of the stator 1 and the rotor 2. No driving fluid flows through the actuator 3, and therefore no load is applied to the drive shaft of the actuator 3.

(Example) FIG. 2 shows an example, and shows a switching valve consisting of a stator 1 and a rotor 2, and an air actuator 13 that drives the switching valve. However, only the flow path for driving the actuator 13 is shown.

Reference numerals 5 and 7 are drive channels for inlet and outlet of compressed air connected to electromagnetic valves (not shown); 6 and 8 are drive channels for sending and discharging compressed air to the actuator 13; In addition, two discharge flow paths described below are provided.

FIG. 3A shows the relative relationship between the driving flow path of the stator 1, the grooves 9 and 10 of the rotor 2, and the actuator 13 when the rotor 2 is in the first stop position, which represents the first state of the switching valve. FIG. Here, 14 and 15 are discharge channels provided in the stator 1, respectively.

Now, in this state, when compressed air is sent into the drive channel 5, the flow path 5→groove 9→drive channel 6→actuator 13→drive channel 8→groove 10→discharge channel 15 A flow in the A direction occurs, which causes the drive shaft of the actuator 13 to
direction to rotate the rotor 2 in the direction a.

Due to the rotation of the rotor 2, the driving flow path changes from 15 to 7 (Fig. 3B) while the compressed air flow direction remains in the A direction. 5, the state shown in Figure 3C is reached, the flow in the A direction stops, and the actuator 1
3 is stopped, and the rotor 2 is stopped.

This is the second stop position of the rotor 2 representing the second switching state of this switching valve.

Next, from the second switching state of FIG. 3C to FIG. 3A
In order to switch to the first switching state, compressed air may be sent from the driving flow path 7 by switching the solenoid valve. In this case, contrary to the above, the flow indicated by the broken line occurs and the rotor 2 rotates in the direction b, passing through the state shown in FIG. 3B and reaching the state shown in FIG. 10, the flow in the direction B indicated by the broken line is stopped, and the rotor 2 is stopped at the first stop position shown in FIG. 3A.

In this embodiment, the actuator 13 is driven using compressed air as the driving fluid, but liquid may also be used. Therefore, the fluid to be switched and the fluid to drive the actuator may be either gas or liquid.

(c) Effects of the invention As described above, the switching valve of the invention uses an actuator driven by fluid, and the actuator is stopped by stopping the flow in the driving flow path by the rotation of the rotor, and the switching valve Since we decided to position itself,
In the stop position, no driving fluid is supplied to the actuator, and a switching valve is achieved in which no load is applied to the drive shaft. This switching valve therefore has the advantage of a long service life.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram explaining the configuration of the present invention, Figure 2 is a schematic diagram explaining the configuration of the present invention.
The figure is a sectional view showing an embodiment of the present invention, and FIGS. 3A to 3C are diagrams mainly showing the relative positions of the stator and rotor to explain the operation of the embodiment. 1... Stator, 2... Rotor, 3, 13...
Actuator, 5, 7...Fluid inlet/outlet channel,
6, 8...flow path connected to the actuator,
9, 10... Rotor groove, 14, 15... Discharge channel.

Claims (1)

[Claims for Utility Model Registration] In a switching valve in which a flow path is switched by a stator and a rotor, the stator is provided with two sets of actuator drive flow paths in addition to the original fluid switching flow path, and each set of flow paths is The actuator drive flow path has a fluid inlet/output flow path, a flow path connected to the actuator, and a discharge flow path, the rotor is fixed to the drive shaft of the actuator, and the rotor has a flow path for switching. In addition, the stator includes two sets of actuator drive flow channels and grooves forming respective flow channels, and the grooves include:
A state in which one flow path is formed between a fluid inlet/output flow path among the actuator drive flow paths of each set of the stator and a flow path connected to the actuator due to rotation of the rotor, and one In the actuator drive flow path of one set, between the fluid inlet/output flow path and the flow path connected to the actuator, and in the other set of actuator drive flow paths, between the flow path connected to the actuator and the discharge flow path. A switching valve characterized in that the switching valve is provided at an angular position such that one flow path is formed in each of the switching valves.