JPH047408Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a corrosion-resistant on-off valve with a shock-reducing structure used in a sample analyzer, and is suitable for use as a three-way valve.

[Conventional technology]

When handling fluids that corrode metals in sample analyzers, the fluid valves used are required to be corrosion resistant. That is, magnetic materials must be used in electromagnetic valves, but magnetic materials generally have poor corrosion resistance against salt water and the like.

For this reason, solenoid valves have been developed in which the drive part, which uses magnetic material, and the valve body part, through which corrosive fluid flows, are separated by a diaphragm or diaphragm called a velofram to prevent the corrosive fluid from coming into contact with the magnetic material. used.

FIGS. 4a and 4b show cross sections of the valve portion of a conventional on-off valve when the valve is open (FIG. 4a) and when the valve is closed (FIG. 4b). 1 is a diaphragm and 2 is a corrosive liquid.

[Problem that the invention attempts to solve]

As is clear from FIG. 4, the capacity of the fluid inside the valve is different when it is open and when it is closed. Changes in fluid pressure due to this volume difference are transmitted as impact pressure to other parts of the piping system each time the piping is opened or closed, causing various problems. For example, when this conventional on-off valve is used in a quantitative dilution device that determines the volume of minute amounts, there is a problem that the liquid protrudes or retreats at the tip of the pipette at the end of the system, causing errors in quantitative measurements. Ta.

In addition, in order to reduce the volume difference between opening and closing, which causes this, we have also set the valve travel distance (stroke).
In the case of a valve with a shortened length, there have been problems such as the flow rate and flow rate being restricted, or the flow path being more likely to be blocked by foreign matter in the fluid.

The present invention was developed in view of these problems, and by eliminating the difference in internal volume between the valve opening and closing, it can be used as a highly corrosion-resistant three-way valve with no driving shock and no flow restriction. The purpose of this invention is to provide an on-off valve suitable for use.

[Means for solving problems]

The corrosion-resistant valve with a shock-reducing structure according to the present invention has valve ports 18, 18 equipped with valve seats 17, 17a at the upper and lower parts.
a, having a connection port 20 on the upper side or the lower side,
Small diameter cavities 14, 15 in the upper and lower parts of the interior.
A cylinder 9 made of a corrosion-resistant material has a large-diameter cavity 16 in the center thereof, is slidably provided in this cylinder via packing, and has small-diameter parts 5b and 5d in the upper and lower parts, and a cylinder 9 in the center thereof. large diameter part 5c
a piston valve 5 made of a corrosion-resistant material and having a vertical passage 8 in the axial center thereof, and a lateral passage communicating with the vertical passage 8 at the upper and lower ends of the piston valve. Valve body seal parts 5a and 5e connected via passages 7 and 7a, and a first drive hole 21 connected to the upper part of the large diameter cavity part 16 of the cylinder,
It is characterized by including a second drive hole 22 connected to the lower part of the large diameter cavity of the cylinder.

In the corrosion-resistant valve of the present invention, the O-ring 12 is used as a packing for the small cavity parts 14 and 15 of the cylinder.
and V packing 13 are provided, and O ring 12 and V packing 13 are provided.
It is preferable that small holes 24 and 25 are provided between the packing 13 and the valve driving pressure to prevent interference between the valve driving pressure and the controlled pressure. The components are:
Both are made of corrosion-resistant materials.

[Effect]

The piston valve 5 moves up and down in the cylinder 9 by air pressure from the open drive hole 21 or the close drive hole 22, and the valve seats 17, 17b are opened and closed by the valve body seals 6, 6a.

When the valve opens and closes, the fluid inside the valve flows through I-shaped channels 7, 7.
a, 8, and the volume inside the valve does not change before and after opening and closing the valve, so the impact caused by opening and closing the valve is eliminated.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, unless there is a specific description, the materials, shapes, relative positions, etc. of the components described in this example are not intended to limit the scope of the present invention, but are merely mere descriptions. This is just an illustrative example.

Figure 1 shows a longitudinal section of an example of the corrosion-resistant valve of the present invention, and Figure 2 shows only the piston valve in Figure 1.
FIG. 3 shows a perspective view of the upper part of the piston valve.

The piston valve 5 is a concentric cylinder made of synthetic resin and has three diameters, and has an upper end surface of the uppermost valve body seal part 5a, and a lowermost valve body seal part 5a.
Valve body seals 6, 6a made of rubber or the like are provided on the lower end surface of e.
is embedded therein, and horizontal flow passages 7, 7a are provided directly below the valve body seal 6 and directly above the valve body seal 6a, penetrating the valve body seal portions 5a, 5e. Further, a vertical passage 8 is provided in the axial center of the piston valve.

Upper and lower small diameter portions 5b, 5 of the piston valve
d is a sliding surface with respect to the cylinder 9, and the diameters of the small diameter portions 5b and 5d are the same.

A large diameter portion 5c is provided between the small diameter portion 5b and the small diameter portion 5d.
is provided, and two square grooves 11 for the V-packing 10 are provided around it.

The cylinder 9 is made of synthetic resin and has a concentric hole through which the piston valve 5 can slide up and down via an O-ring 12 and V-packings 10 and 13. That is, small diameter cavities 14 and 15 are provided in the upper and lower parts of the interior, and large diameter cavity 1 is provided in the central part of the interior.
6, a valve port 18 with a valve seat 17 and a nipple joint protruding is provided in the upper part of the small diameter cavity 14, and a valve seat 17a is provided in the lower part of the small diameter cavity 15.
A valve port 18a from which a nipple joint protrudes is provided. In addition, there is a connection port 2 on the upper side of the cylinder 9.
0 is set. Note that this connection port can also be provided on the lower side of the cylinder.

The large-diameter cavity 16 has a first drive hole 21 and a second drive hole which are inflow and outflow holes for high-pressure air that drives the piston valve 5.
A drive hole 22 is provided.

Around the small diameter portions 5b and 5d of the piston valve, O
There are 4 square grooves 23 for the ring 12 and V packing 13.
The book is engraved. Pores 24 and 25 are provided between each two of the square grooves 23 provided above and below.

The cylinder 9 has a first drive hole 2 in the large diameter cavity 16.
1 and the second drive hole 22 by screwing the upper and lower parts together.

In order to improve sealing performance, the V packings 10 and 13 are installed with the grooved side (ie, the concave side in FIG. 1) facing the higher pressure side. Also, an O-ring 12 must be used where the pressure gradient is not determined.

The valve body seal 6, the V-packings 10, 13, and the O-ring 12 are made of corrosion-resistant materials, such as fluorine-based Viton.

Next, the operation of the corrosion-resistant valve of this embodiment will be explained.

In FIG. 1, when high pressure air is sent to the second drive hole 22 and the first drive hole 21 is released to the atmosphere, the piston valve 5 moves upward until the upper valve body seal 6 touches the valve seat 17, and the upper valve The port 18 is closed, and the connection port 20 and the lower valve port 18a communicate with each other.

Next, when high-pressure air is sent to the first drive hole 21 and the second drive hole 22 is released to the atmosphere, the lower valve port 18a is closed, and the upper valve port 18 and the connection port 20 communicate with each other.

When the valve is opened and closed as described above, since the diameters of the small diameter part 5b and the small diameter part 5d of the piston valve 5 are the same, the volume increase in the lower part due to the upward movement of the piston valve 5 is the same as the volume reduction in the upper part. , there is no increase or decrease in the intravalve volume. In addition, the flow paths 7, 7a, and 8 are configured to have a larger diameter and shorter length than the external piping, so the flow resistance is low and the fluid inside the valve quickly flows through the flow path 7. , 7a, 8.

Therefore, the valve of the present invention acts so as not to transmit impact pressure when opening and closing the valve to the outside of the valve. In addition, pore 2
4 and 25 are for releasing the leaked driving high-pressure air to atmospheric pressure so that the driving high-pressure air leaking through the V-packing 13 does not leak through the O-ring 12 and affect the controlled fluid pressure. It is something.

In the above embodiment, a case was explained in which high pressure air is used as the working fluid, but it is also possible to use hydraulic fluid etc. instead of high pressure air, and instead of using the valve vertically. It is also possible to use the valve laterally.

[Effect of idea]

In the present invention, there is no change in volume within the valve when the valve is opened or closed, and the fluid within the valve moves quickly, so there is no impact pressure generated when the valve is opened or closed.

Therefore, it has the effect that even minute volume determination can be performed with high accuracy.

Furthermore, in order to reduce impact, there is no need to particularly shorten the travel distance of the valve, and a sufficient flow rate and flow velocity can be obtained for use.

Furthermore, all materials are corrosion-resistant, so corrosive fluids such as saline can be used with confidence.

In addition, the driving pressure system and the controlled pressure system controlled by the main on-off valve are separated by O-rings 12, V-packings 10, 13, and small holes 24, 25, which impede valve action. This has the effect of completely insulating the two from each other in terms of pressure so that no damage is caused.

The present invention has the above-mentioned useful effects and can be effectively used as a three-way valve for determining, diluting, dispensing, etc. small amounts of liquid medicines.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of a corrosion-resistant valve with an impact mitigation structure of the present invention, FIG. 2 is an explanatory longitudinal cross-sectional view showing a state in which only the piston valve in FIG. 1 is rotated 90 degrees, Fig. 3 is a perspective explanatory view of the upper part of the piston valve, Fig. 4 is a partial sectional view of a conventional corrosion-resistant valve, Fig. 4a shows the valve in the open state, and Fig. 4b shows the valve in the closed state. It shows the condition. 1...Diaphragm, 2...Corrosive liquid, 5
... Piston valve, 5a, 5e ... Valve body seal part,
5b, 5d...Small diameter part, 5c...Large diameter part, 6...
Valve body seal, 7, 7a... Horizontal flow path, 8...
Vertical flow path, 9...Cylinder, 10, 13...
V packing, 11... Square groove, 12... O ring, 14, 15... Small diameter cavity, 16... Large diameter cavity, 17, 17a... Valve seat, 18, 18a...
Valve port, 20... Connection port, 21... First drive hole, 2
2...Second drive hole, 23...Square groove, 24, 25...
…pore.

Claims (1)

[Claims for Utility Model Registration] 1. Valve ports 18, 18a with valve seats 17, 17a on the upper and lower parts, a connection port 20 on the upper or lower part, and a small diameter cavity in the upper and lower parts of the inside. The body parts 14 and 15 are made of a cylinder 9 made of a corrosion-resistant material and having a large-diameter cavity part 16 in the center thereof.
It is slidably provided in this cylinder via packing, and has small diameter portions 5 at the top and bottom.
b, 5d, a piston valve 5 made of a corrosion-resistant material having a large diameter part 5c in the center and a vertical flow path 8 in the axial center, and the vertical Valve body seal portions 5a, 5e connected via lateral flow paths 7, 7a communicating with the directional flow path 8, and a first drive hole 21 connected to the upper part of the large diameter cavity 16 of the cylinder. and,
A second tube connected to the lower part of the large diameter cavity of the cylinder.
A corrosion-resistant valve having a shock-reducing structure, characterized in that it includes a drive hole 22. 2. An O-ring 12 and a V-packing 13 are provided as packing for the small-diameter hollow portions 14 and 15 of the cylinder, and in order to prevent interference between the valve driving pressure and the controlled pressure between the O-ring 12 and the V-packing 13. A corrosion-resistant valve having an impact-reducing structure according to claim 1, which is provided with pores 24 and 25.