JPH0638223Y2 - Multi-way switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multi-way switching valve such as a six-way valve.

[Conventional technology]

For example, in a FID (Flame Ionization Detector), as shown in FIG. 3, six independent channel holes 1, 2, 3, 4, 5,
The fixed block A forming 6 and two long groove-shaped communication passages 7, 8 which rotate while slidingly contacting the fixed block A, and selectively connect the flow path holes with each other by this rotation.
The sample supply path is switched by using a six-way valve V including a movable block B formed on the sliding contact surface b. Reference numeral 9 denotes a shaft projecting from the sliding surface a of the fixed block A, which is fitted in a hole 10 on the movable block B side to rotatably hold the movable block B.

FIG. 4 shows a FID sampling unit using the hexagonal valve V having the above-mentioned configuration. In FIG. 4, P ₁ , P ₂ , P ₃ , P ₄ , P ₅ and P ₆ are fixed blocks A of the hexagonal valve V. Reference numeral 11 denotes a FID, which is a connection port formed on the surface opposite to the sliding surface a and communicating with the flow path holes 1, 2, 3, 4, 5, and 6, respectively. 12 and 13 are hexagonal valve V and FID11
The sample supply paths which are connected in parallel with each other, and one end side of one sample supply path 12 is connected to the connection ports P ₂ , P
₃ and the other end of the sample supply path 13 is connected to the connection ports P ₅ and P ₆ . The other end sides of both sample supply paths 12 and 13 are connected to FID 11 via a joint point J ₁ . Reference numerals 14 and 15 are capillaries provided in both sample supply paths 12 and 13, respectively.

Reference numeral 16 is an overflow flow path provided with a flow rate adjusting valve 17, one end side of which is connected to the connection port P ₄ and the other end side of which is open. Reference numeral 18 denotes a sample flow path, one end side of which is connected to the connection port P ₁ and the other end side of which is connected to a sample gas source (not shown). 19 is a fuel gas (hydrogen gas) supply path, which is connected to the FID 11 via a joint point J ₂ .

Thus, when the communication passages 7 and 8 of the six-way valve V are at the positions shown by the solid lines in FIG. 4, most of the sample gas G overflows through the overflow passage 16 and a predetermined amount of one It is supplied to the FID 11 via the sample supply path 12. When the movable block B is rotated 180 ° and the communication passages 7 and 8 of the hexagonal valve V are set to the positions shown by the phantom lines in FIG. 4, the sample gas G is similarly supplied to the other sample supply passage 13 A predetermined amount is supplied to the FID 11 via.

Therefore, in the sampling unit configured as described above, a sound sample supply path is used when an abnormality occurs in either one of the sample supply paths 12 or 13 or when one of the capillaries 14 or 15 is replaced. By doing so, the sample gas G can be supplied to the FID 11, so that predetermined measurement can be performed without interrupting measurement for restoration or replacement.

[Problems to be solved by the invention]

However, in the above hexagonal valve V, the following problems occur unless the sliding surfaces a and b of the fixed block A and the movable block B are finished with sufficiently high accuracy and sufficient sealing performance.

That is, when the communication passages 7 and 8 of the six-way valve V are at the positions shown by the solid lines in FIG. ₄ , the flow passage holes 1 and 2 that communicate with the connection ports P ₁ , P ₂ , P ₃ and P ₄ , respectively. Since the sample gas G flows in the insides of the channels 3 and 4, the internal pressure of the channel holes 1, 2, 3 and 4 is higher than the atmospheric pressure, but the channels connected to the connection ports P ₅ and P ₆ respectively. Hole
Since the sample gas G does not flow in 5, 6
The internal pressure of 5,6 is almost equal to atmospheric pressure.

Therefore, if the sliding surfaces a and b are not sufficiently finished and the sealing property is not good, the communication passage 7 for connecting the flow passage holes 1 and 2 and the communication passage 8 for connecting the flow passage holes 3 and 4 are formed. The sample gas G leaks from either or both, and the leaked sample gas G flows into the flow path holes 5 and 6 and flows into the FID 11 via the sample supply path 13 and is not the original sample supply path 12. The sample gas G is also fed to the FID 11 through the sample supply path 13.
Will be supplied.

By the way, since the detection sensitivity of the FID 11 is proportional to the flow rate of the sample gas G passing through the capillary, the amount of sample gas supplied to the FID 11 must be strictly controlled. Also through FID11
When the sample gas G is supplied to the device, the supplied sample gas amount fluctuates, which adversely affects the detection sensitivity, and the responsiveness deteriorates, making it impossible to perform precise measurement.

As described above, in order to prevent the gas leak that adversely affects the measurement, it is necessary to improve the finishing accuracy of the sliding surfaces a and b, but this finishing requires a high level of technology and also reduces the productivity. This will increase the cost, and the high temperature FID11
In the above, since the sliding surfaces a and b are placed in a harsh atmosphere such as 200 ° C., it is difficult to maintain a good sealing property for a long time.

The present invention has been made with the above matters in mind, and its purpose is to allow the leaked gas to escape to the atmosphere even if a gas leak occurs so that the analyzer is not adversely affected. The present invention is to provide a multi-way switching valve.

[Means for solving problems]

In order to achieve the above-mentioned object, the multi-way switching valve according to the present invention separates a group of flow passages, which are communicated with each other by the communication passages, and other flow passage holes from each other, on the sliding surface of the movable block. In addition, a concave groove is formed in a state that it does not intersect with the communication passage and the flow passage hole, and an exhaust flow passage is formed between both blocks to lead out the gas leaked between the two blocks to the atmosphere. Is characterized by.

[Action]

According to the above characteristic configuration, the leaked gas is introduced into the atmosphere between the blocks, so that the leaked gas is prevented from entering the flow path hole where the gas should not originally flow.

〔Example〕

An embodiment of the present invention for a six-way valve V will be described below with reference to FIGS. 1 and 2. In both figures, the same reference numerals as those shown in FIG. 3 indicate the same or corresponding parts, and detailed description thereof will be omitted.

The characteristic configuration of the present invention different from the conventional technique is that an exhaust flow path 20 is formed between the fixed block A and the rotating block B to lead the leaked gas between the blocks A and B to the atmosphere. It is in.

That is, referring to the flow passage communication mode shown in FIG. 2, a first group of flow passage holes 1 and 2 communicated with each other by a communication passage 7 and a flow passage hole communicated with each other by a communication passage 8. The second group 3 and 4 and the other flow passage holes 5 and 6 are separated from each other, and the communication passages 7 and 8 and the flow passage hole 1 are separated from each other.
6A to 6C, and further, the openings z, y, z are formed in the peripheral portion of the rotating block B so as to form, for example, a human-like concave groove 20A, 20B in plan view. , 20C are formed on the sliding surface b of the movable block B, and between the overlapping portions of the blocks A and B, an exhaust flow path (concave portion) is formed to guide the gas leaked between the blocks A and B to the atmosphere. The groove 20A, 20B, 20C and the sliding surface a on the fixed block A side that closes these grooves 20 are formed.

According to the above configuration, when the sample gas G leaks between the blocks A and B from either or both of the communication passages 7 and 8 under the communication of the flow path shown in FIG. 4, for example,
The leak gas flows into the exhaust passage 20 and is opened from the opening z, y, z at the peripheral portion of the rotating block B to the outside of the six-way valve V, that is,
Since it is discharged to the atmosphere, leak gas is surely prevented from flowing into the other flow path holes 5 and 6.

As a result, the sample gas G is supplied to the FID 11 only by the original sample supply path 12, and the supply amount of the sample gas G to the FID 11 does not fluctuate.
It is possible to prevent the fluctuation of the detection sensitivity of 1 and the deterioration of responsiveness, and to perform accurate measurement.

As shown by the broken line in FIG. 4, the flow passage holes 4 and 5 are made to communicate with each other by the communication passage 7, and the flow passage holes 1 and 6 are made to communicate with each other by the communication passage 8. Even when the sample gas G is supplied, the leak gas flowing in both blocks A and B is led to the atmosphere through the exhaust passage 20.

The present invention is not limited to the structure of the above-described embodiment, and the point is that a group of flow passages that are communicated with each other by the communication passages and other flow passage holes are provided on the sliding surface of the rotating block. An exhaust passage that separates the gas and forms a groove in a state where it does not intersect with either the communication passage or the flow passage hole, and leads the gas leaked between the two blocks to the atmosphere. And the plan view shape can be set arbitrarily.

Further, the present invention can be applied to a multi-way switching valve other than the six-way valve V.

[Effect of device]

As described above, according to the multi-way switching valve of the present invention, the gas leaked between the two blocks is guided to the atmosphere,
Since the leak gas is surely prevented from entering the flow path hole where the gas should not originally flow, for example, the analyzer is not adversely affected and accurate analysis is achieved.

Also, even if gas leaks between both blocks, this does not cause a problem, so it is not necessary to increase the finishing accuracy of each sliding surface of both blocks so much, and the productivity and long life of this kind of multi-way switching valve are improved. As a result, the multi-way switching valve can be provided at a low cost.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is an exploded perspective view of a hexagonal valve, and FIG. 2 is a plan view of a movable block side as seen from a mating surface of a fixed block and a movable block. Is. FIG. 3 is an exploded perspective view showing a conventional six-way valve, and FIG. 4 is a diagram showing a configuration of a general FID sampling unit. 1,2,3,4,5,6 ... Flow path hole, 7,8 ... Communication passage, 20 ... Exhaust flow path, 20A, 20B, 20C ... Concave groove, A ... Fixed block, B ...
… Rotation block, b …… Sliding surface.

Claims (1)

[Scope of utility model registration request] 1. A fixed block in which a plurality of independent flow path holes are formed, and a connecting block which is slidably rotatable with respect to the fixed block and selectively connects the flow path holes with the rotation. In a multi-way switching valve including a movable block having a passage formed on the sliding surface side, a group of passage holes and other passage holes communicated with each other by the communication passage are formed on the sliding surface of the movable block. An exhaust flow path is formed between the two blocks so that the gas leaks between the two blocks can be separated into the atmosphere by forming a concave groove so as not to cross the communication path and the flow path hole. A multi-way switching valve characterized by being configured.