JPH0316550B2 - - Google Patents

Description

[Detailed Description of the Invention] 1. Field of Industrial Application The present invention relates to a vacuum evaporator, a vacuum concentrator, and a vacuum level control valve that has a self-control function to maintain a desired vacuum pressure when promoting distillation, and is particularly applicable to peripheral equipment systems of these devices. Regarding.

In order to maintain constant product quality in the above equipment,
The vacuum pressure must be controlled at a constant level, and if the gas generated from the device is not completely removed by condensation, the life of the vacuum generator itself may be shortened depending on the type of gas.

2. Prior Art Conventionally, in this type of vacuum pressure control equipment, there was a main vacuum line, and branched pipes from the main vacuum line were connected to the suction port of the device to be evacuated. In order to maintain a constant degree of vacuum inside the vacuum device, a bypass needle valve is installed on the suction side of the device.
The degree of vacuum inside the device was adjusted by forcibly inhaling air.

In addition, the gas generated from the device was removed by a cold trap that was forcibly condensed using an extremely low temperature solution such as liquid nitrogen, and was prevented from flowing into the vacuum generator.

3 Problems to be Solved by the Present Invention With the above system, it is difficult to obtain a desired degree of vacuum with high accuracy. In other words, it is necessary to constantly adjust the opening degree of the bypass needle valve in accordance with pressure changes on the vacuum generator side. Furthermore, sucking air into the pipe leads to extra operation of the vacuum generator, increasing running costs.

The cold trap itself is expensive, requires similar piping, and uses cryogenic solutions, making the cost very high.

4 Means for Solving the Problem The technical means taken by the present invention is to provide a valve port that communicates the two in a valve housing having an inlet and an outlet, and to form a valve chamber partitioned by a diaphragm on the inlet side. A vacuum degree adjustment system in which a valve body that opens and closes the mouth is provided inside the valve chamber of the diaphragm, and an adjustment spring that balances the diaphragm according to the pressure in the valve chamber is placed inside or outside the valve chamber of the diaphragm, or on both sides. In the valve, in order to remove uncondensed gas from the vacuum air body, a liquid reservoir is provided between the inlet and outlet passages, and an aqueous solution is stored in the reservoir and passed through a sintered metal filter to remove the uncondensed gas. Gas is ejected and foamed. Alternatively, an activated carbon filter is placed in the secondary passage of the liquid storage chamber.

5. Effect The inlet side of the valve of the present invention is connected to a device to be evacuated, and the outlet side is connected to a vacuum pump, respectively, and suction is performed by the vacuum pump. Manipulate the adjustment screw to force the diaphragm and its associated valve to the desired state. At the beginning of operation, the pressure in the valve chamber is still higher than the desired pressure, so the diaphragm remains in the same state and the valve port continues to suck. When the pressure in the valve chamber eventually decreases and approaches the desired pressure, the biasing force of the upper adjustment spring overcomes and the diaphragm bends downward, working to close the valve port. Normally, it operates while maintaining this balanced state. Any degree of vacuum can be easily obtained by operating this adjustment spring force.

Between the valve port and the outlet side, uncondensed gas passes through a sintered metal filter and is ejected into the aqueous solution in the liquid reservoir. At this time, the gas increases its surface area due to its bubbling action and dissolves in the aqueous solution.

The undissolved gas is further adsorbed by an activated carbon filter provided on the outlet side.

6 Effects of the invention The present invention produces the following unique effects.

The degree of vacuum can be easily adjusted at low cost without the need for large-scale equipment, and clean air can be sent to the secondary side.

Since the valve operates in balance with a diaphragm, the pressure on the primary side can be maintained constant regardless of changes in the degree of vacuum on the secondary side.

7 Example An example showing a specific example of the above technical means will be described. (See Figure 1) An inlet 2 and an outlet 3 are coaxially formed in the main body 1, and each is provided with a female thread for piping connection. A space surrounded by walls of the main body is formed in a direction perpendicular to the axis connecting the inlet and outlet of the main body, and a valve seat member 5 having a valve port 4 at the bottom is inserted with a gasket 9 in between. A male thread is provided at the bottom of the valve seat member 5, a gasket 6 is interposed on the lower surface of the main body, and the cap 7 is held and fixed by a holder 8. The upper end of the valve seat member 5 is made of rubber valve seat seat 1.
0 is adhesively bonded.

Rubber (or metal) between main body 1 and lid 13
The diaphragm 11 is tightened with a pinch bag nut 12 to form a valve chamber 14. A valve body 15 is passed through the diaphragm 11 toward the inside of the valve chamber 14, and washers 16 and 17 are sandwiched between the upper and lower sides and fixed.

A lower adjustment spring 19 is arranged between the lower surface of the diaphragm 11 and the bottom of the valve chamber 14 so as to be centered on the valve opening. On the other hand, an upper adjustment spring 20 is arranged on the upper surface, and an adjustment screw 18 is screwed into the upper part of the lid 13 by holding a spring retainer 22 into which a rigid ball 21 is press-fitted.
energize with.

A lock nut 23 is screwed between the top of the lid 13 and the adjustment screw 18, and a communication port 24 with the atmosphere is opened.

Insert the collection pin 25 into the lower part of the cap 7 and attach it. The lower end of the valve seat member 5 is located in the collecting bin 25, and a rubber tube 26 is attached thereto, and one end thereof is attached with a sintered metal filter 27. A hole toward the outlet is opened in the holder 8, and the hole is closed with an activated carbon filter 28. The collection pin 25 is always about half filled with an aqueous solution, and the sintered metal filter 27 is underwater.

The action is as follows.

Connect the inlet 2 and the vacuum generator, and the outlet 3 and the vacuum generator, respectively, with piping. The adjusting screw 18 is operated to press the diaphragm 11 and the valve body 15 into a desired state. At the beginning of operation, the pressure in the valve chamber 14 is still higher than the desired pressure, so the diaphragm 11
remains as it is, and the valve port 4 is opened to continue suction. When the pressure in the valve chamber 14 eventually decreases and approaches a desired pressure, the biasing force of the upper adjustment spring 20 overcomes and the diaphragm 11 is bent downward, working to close the valve port 4. Normally, it operates while maintaining this balanced state. Pushing down the adjustment screw 18 makes it easier to close the valve, so the set pressure can be increased; conversely, pushing it up makes it difficult to close the valve, so the set pressure can be set low. In this way, by manipulating the adjustment spring force, any degree of vacuum can be easily obtained.

Between the valve port 4 and the outlet 3, uncondensed gas passes through a sintered metal filter 27 and is ejected into the aqueous solution in the reservoir chamber. At this time, the gas increases its surface area due to its bubbling action and dissolves in the aqueous solution.

The undissolved gas is further adsorbed by an activated carbon filter 28 provided at the outlet 3.

The valve of the present invention operates in a balanced state between the pressure in the valve chamber 14 and the adjustment spring 18, so even if the degree of vacuum of the outlet pressure changes, it can automatically control itself without operating the adjustment screw. , always providing the desired temporary pressure.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vacuum level regulating valve according to an embodiment of the present invention. 1...Body, 2...Inlet, 3...Exit, 4...
Valve port, 13...Lid, 11...Diaphragm, 14
... Valve chamber, 15 ... Valve body, 18 ... Adjustment screw, 1
9, 20... Adjustment spring, 25... Collection bottle, 27
... Sintered metal filter, 28 ... Activated carbon filter.

Claims (1)

[Scope of Claims] 1. A valve port that communicates the two is provided in a valve housing having an inlet and an outlet, a valve chamber partitioned by a diaphragm is formed on the inlet side, and a valve body for opening and closing the valve port is connected to the valve of the diaphragm. In a vacuum level control valve, an adjustment spring is provided on the inside of the chamber and balances the diaphragm according to the pressure in the valve chamber. A vacuum level control valve device characterized by having a liquid reservoir chamber between an inlet and an outlet passage to extract gas. 2. In the device according to claim 1,
A vacuum degree regulating valve device characterized in that an aqueous solution is stored in a liquid storage chamber, and uncondensed gas is ejected and foamed through a sintered metal filter. 3. In the device described in claim 1,
A vacuum level control valve device characterized in that an activated carbon filter is arranged in a secondary passage of a liquid storage chamber.