JPH09300310A - Device for injecting liquid into timber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a liquid surface height of treating solution in a treating tank easily accurately from outside a pressure container. SOLUTION: In a device for injecting liquid into timber equipped with a treating tank 2 for loading timber 1 to be treated, and a pressure container 3 for housing the treating tank 2, a level gage 4 measuring a liquid surface height of treating solution introduced into the treating tank 2 is provided by being interconnected to the treating tank 2. Further, a deaeration part for separating gas in the treating solution from the treating solution flowing into the level gage 4 from the treating tank 2 is provided between the treating tank 2 and the level gage 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid injection device for wood, which injects an arbitrary treatment liquid into wood, and more particularly to a liquid injection device for wood by a pneumatic bath system.

[0002]

2. Description of the Related Art Generally, by injecting various treatment liquids into wood, the wood is made flame-retardant, its size is stabilized, its strength is improved, and its antiseptic, ant-repellent and insect-repellent properties are enhanced, and it is further dyed. By doing so, it is widely used to increase the commercial value by expanding the application, and various processing liquid injecting apparatuses for this purpose are provided. As one of such processing liquid injecting devices, a device adopting a so-called pneumatic bath system has been proposed.

This pneumatic bath type processing liquid injecting apparatus is provided with a processing tank for mounting the wood to be processed and a pressure vessel for accommodating the processing tank. Then, the treatment tank in which the wood to be treated is mounted is housed in the pressure vessel, and the treatment liquid is introduced into this treatment tank. Then, the inside of the pressure vessel is decompressed, and then the inside of the pressure vessel is pressurized so that the treatment liquid is injected into the wood to be treated. The reason for depressurizing the inside of the pressure vessel before pressurizing is to remove the gas existing in the treated wood and increase the efficiency of injecting the treatment liquid into the treated wood. Then, after pressurizing the inside of the pressure container as described above, the inside of the pressure container is decompressed to atmospheric pressure, and then the processing tank is extracted from the pressure container.

Here, in the wood treatment, it is necessary to surely inject a predetermined amount of the treatment liquid into the wood to be treated according to the type of the wood to be treated. The pressurizing conditions such as the pressurizing time and the pressurizing pressure necessary for injecting into wood are not uniquely determined because they are subtly different for each treated wood. Therefore, every time the treatment liquid is injected into the treated wood, it is necessary to measure and manage the amount of the treatment liquid in the treated wood on site. For this reason, in the above-mentioned conventional treatment liquid injection device, the liquid level height in the treatment tank is measured immediately after the treatment liquid is introduced into the treatment tank, the pressure in the pressure vessel is reduced, and the pressure in the pressure vessel is reduced to atmospheric pressure. The pressure was released, the lid of the pressure vessel was opened, and the liquid level in the treatment tank inside the pressure vessel was measured again to obtain the amount of treatment liquid in the treated wood.

[0005]

However, in such a conventional processing liquid injecting apparatus, the liquid level height in the processing tank is measured after the pressure inside the pressure vessel is decompressed to the atmospheric pressure. Has caused various problems such as. That is, since a part of the treatment liquid that has once entered the material to be treated by pressurization returns due to decompression, the amount of treatment liquid in the treated wood at the time of pressurization and that at the time of decompression differ from each other. But,
The above device can measure only the amount of the treating liquid in the treated wood when the pressure is released, and cannot measure the amount of the treating liquid in the treated wood when pressurized. Therefore, it is impossible to control the pressurizing conditions such as the pressurizing time and the pressurizing pressure by referring to the amount of the treatment liquid in the treated wood at the time of pressurization, and it is possible to slightly change each treated wood. Since it is not possible to adapt to the pressure condition, the injection amount of the treatment liquid in the treated wood may be less than the predetermined amount or may exceed the predetermined amount.

Since the liquid level cannot be measured unless the lid of the pressure vessel is opened, it is necessary to close the lid and re-inject the treatment liquid when it is found by the measurement that the prescribed injection amount has not been reached. However, this has been a factor in increasing the processing time. Further, when the treatment liquid was injected into the wood to be treated in excess of the predetermined amount, the treatment liquid was lost. Also, in this case, the treated liquid level may drop too much and the treated wood may be exposed above the treated liquid level.Therefore, compressed air enters the exposed area and the treated liquid penetrates. May be uneven. In this case, it is necessary to inject the processing liquid again, and in this injection, the depressurization time needs to be longer than usual, so that the time loss becomes extremely large.

Further, immediately after the depressurization is started, gas is released from the material to be treated for a while, so that the treatment liquid is foamed and overflows from the treatment tank in the form of bubbles to cause a loss. Because the processing liquid of
There is also a risk that the material to be processed is exposed when the processing liquid level is lowered during pressurization. In order to prevent this, the material to be treated is set low, but there is also the problem that the volume of treated material is reduced and efficiency is poor.

The present invention has been made in view of the above problems in the conventional treatment liquid injecting apparatus for wood, and the liquid level of the treatment liquid in the treatment tank can be easily and accurately adjusted from the outside of the pressure vessel. An apparatus for injecting a treatment liquid into wood that can be measured is provided.

[0009]

SUMMARY OF THE INVENTION In order to solve the problems in the conventional treatment liquid injecting apparatus for wood, the present invention according to claim 1 provides a treatment tank for mounting wood to be treated. In a liquid injection device for wood, comprising a pressure vessel for accommodating the treatment tank, a liquid level gauge for measuring the liquid level of the treatment liquid introduced into the treatment tank is communicated with the treatment tank. It is configured by being provided.

The present invention according to claim 2 provides the invention according to claim 1.
In the present invention described in, the degassing section for separating the gas in the treatment liquid from the treatment liquid flowing into the liquid level gauge from the treatment tank is provided between the treatment tank and the liquid level gauge. It is characterized by that.

The present invention according to claim 3 provides the invention according to claim 2.
In the present invention according to claim 1, the degassing section is formed from a pipe communicating with a withdrawal pipe from the treatment tank to the liquid level gauge and a return pipe from the liquid level gauge to the treatment tank, and the withdrawal of the pipe. It is characterized in that the connecting portion with the pipe is a trap portion having a wider cross section than that of the drawing pipe.

The present invention according to claim 4 provides the invention according to claim 2.
In the present invention according to, characterized in that the degassing section is formed from a bubble separator that communicates with a drawing pipe from the processing tank to the liquid level gauge and a return pipe from the liquid level gauge to the processing tank. It is configured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall view of the present apparatus in this embodiment, and FIG. 2 is a conceptual view of the main parts of FIG. First, the configuration of the device in the present embodiment will be described, and then the liquid level measurement operation in the device will be described. In each of the above figures, the present apparatus is provided with a processing tank 2 for mounting the treated wood 1, a pressure vessel 3 for housing the processing tank 2, and a liquid level height of the processing liquid introduced into the processing tank 2. And a liquid level gauge 4 for measuring.

The pressure vessel 3 comprises a hollow cylindrical body 5 and a body 5
It is composed of a lid 6 which is attached to one end of the building so as to be openable and closable, and is fixed to the foundation of the building by legs. A measurement nozzle 7, a decompression nozzle 8 and a pressure nozzle 9 are provided on the upper part of the body 5, and the decompression nozzle 8 is connected to a decompression device 10 and the pressure nozzle 9 is connected to a pressure device 11, respectively. . Draw-out pipes 12 and 13 are drawn out from the lower portion of the body 5 on the lid 6 side, and a rail 14 for receiving the processing tank 2 is provided inside the body 5.

A rail 15 is laid on the side of the pressure vessel 3, and the processing tank 2 can be housed in the pressure vessel 3 by a carriage 16 traveling on the rail 15. Outlet pipes 17 and 18 are provided on the right side of the processing tank 2, and when the processing tank 2 is housed in the pressure container 3, the outlet pipe 17 is connected to the withdrawal pipe 12 of the pressure container 3 and the outlet pipe 1.
8 are connected to the pull-out pipe 13 via flexible hoses 19, respectively.

As described above, between the outlet pipe 13 of the pressure container 3 connected to the outlet pipe 18 of the processing tank 2 and the return pipe 20 connected to the measurement nozzle 7 of the pressure container 3, the above-mentioned liquid level gauge is provided. 4 is connected. This liquid level gauge 4 has substantially the same pressure resistance as the pressure vessel 3, and as shown in FIG. 2, a cylindrical main body 4a and a glass plate 4b provided on one side surface of the main body 4a.
The glass plate 4b has a liquid level gauge 4
A scale 4c is provided for reading the height of the processing liquid flowing into the inside. The liquid level gauge 4 is provided at substantially the same height as the liquid level of the processing liquid introduced into the processing tank 2, and the liquid level gauge 4 and the pressure vessel 3 are connected to each other by a drawing pipe 13 and a return pipe 20. Since the pressure is the same through the liquid level, the liquid level in the liquid level gauge 4 and the liquid level in the processing tank 2 are the same. Therefore,
By reading the liquid level in the liquid level gauge 4, the processing tank 2
The liquid level inside can be read.

Ball valve type safety devices 21, 21 are provided near the top and bottom of the level gauge 4, and when the processing liquid in the level gauge 4 flows out due to damage of the level gauge 4 or the like. The safety devices 21 and 21 block the extraction pipe 13 and the return pipe 20 to prevent further outflow of the processing liquid. Also this safety device 2
As shown in the drawing, valves 22 to 24 are provided in the vicinity of 1 and 21.
Is provided. When a problem occurs in the liquid level gauge 4, the valves 22, 22 are closed to close the liquid level gauge 4.
The processing liquid is prevented from flowing into. Also valve 2
By opening 3, 23, the processing liquid in the liquid level gauge 4 can be drained and the liquid level gauge 4 can be cleaned. The use of the valve 24 will be described later.

Here, gas is mixed in the processing liquid flowing into the liquid level gauge 4 due to foaming at the time of decompression, and the gas in this processing liquid is curved around the extraction pipe 13, the safety device 21 and the like. It may accumulate at the neck. Then, the liquid level height in the liquid level gauge 4 and the liquid level height of the processing liquid in the processing tank 2 do not become exactly the same, and the function of the liquid level gauge 4 cannot be fully exhibited. In addition, the treatment liquid is added to the liquid level gauge 4 by eliminating curved points or constricted portions or inclining the drawing pipe 13.
Even if the liquid flows in as smoothly as possible, the gas in the processing liquid escapes through the liquid level gauge 4, and the liquid level in the liquid level gauge 4 becomes unstable and fluctuates. The function of the area meter 4 cannot be fully exerted. In particular, it is necessary to mount the liquid level gauge 4 at a high position in order to incline the drawing pipe 13,
In this case, the liquid level that can be measured by the liquid level gauge 4 is limited to a high range. Therefore, it is necessary to prevent gas from accumulating in the extraction pipe 13 and prevent the gas from reaching the liquid level gauge 4.

Therefore, in the present apparatus of this embodiment,
Between the processing tank 2 and the liquid level gauge 4, there is provided a degassing section 25 for separating the gas in the processing liquid from the processing liquid flowing into the liquid level gauge 4 from the processing tank 2. This degassing section 25 is shown in FIGS.
As shown in FIG. 3, it is formed as a pipe provided between the withdrawal pipe 13 and the return pipe 20, and a trap portion 26 is provided at the connecting portion of this pipe with the withdrawal pipe 13. As shown in an enlarged scale in FIG.
On the other hand, it has a large diameter and a wide cross-sectional area.

Next, the liquid level measuring operation of this apparatus will be described. First, the treatment tank 2 in which the treated wood 1 is mounted is stored in the pressure vessel 3 by using the carriage 16 and the rail 15. Then, the outlet pipe 18 of the processing tank 2 is connected to the withdrawal pipe 13 of the pressure container 3 via the flexible hose 19, and the lid 6 of the pressure container 3 is closed. Then, the depressurization of the pressure vessel 3 is started, the gas existing in the wood 1 to be treated is released to some extent, and then the treatment liquid is introduced into the treatment tank 2 while continuously depressurizing. At this time, the valves 23 and 24 are closed and only the valve 22 is opened. Then, the treatment liquid in the treatment tank 2 flows into the liquid level gauge 4 via the extraction pipe 13 due to the pressure reducing effect. Here, although gas is mixed in the treatment liquid due to foaming during depressurization, as shown in FIG. 4, since the cross-sectional area of the trap portion 26 of the degassing portion 25 is larger than that of the extraction pipe 13, The flow velocity of the treatment liquid slows down in the trap portion 26, and the gas that has penetrated into the treatment liquid floats above the trap portion 26 without going to the liquid level gauge 4 side. Therefore, the liquid level in the liquid level gauge 4 exactly matches the liquid level in the processing bath 2, and the liquid level in the processing bath 2 can be controlled in real time by the liquid level gauge 4. Therefore, it is confirmed via the liquid level gauge 4 that the processing liquid in the processing tank 2 has reached a predetermined liquid level, and the introduction of the processing liquid is completed.

Next, the pressurization of the pressure vessel 3 is started. Then, the treatment liquid is injected into the wood 1 to be treated by pressurization, so that the height of the liquid level in the treatment tank 2 is lowered, and accordingly, the height of the liquid level in the liquid level gauge 4 is lowered. Then, the pressurizing condition can be adjusted while observing the liquid level height displayed on the liquid level gauge 4, so that the amount of the processing liquid in the wood to be treated can be made equal to the predetermined amount. After pressurization, the pressure vessel 3 is decompressed to atmospheric pressure, the operation of each device is stopped, the lid 6 is opened, and the processing tank 2 is pulled out from the pressure vessel 3.

Although one embodiment of the present invention has been described above, the present invention may be implemented in various different forms within the scope of the technical idea thereof. For example, as for the liquid level gauge 4, it is possible to connect short liquid level gauges 4A and 4A in series vertically as shown in FIG. In this case, it is simpler and cheaper to manufacture the liquid level gauge 4A that is shorter than the long liquid level gauge 4, so that the entire apparatus can be constructed at low cost. However, in this case, there is a gap between the short liquid level gauges 4A and 4A, and measurement cannot be performed in this gap. Therefore, in order to eliminate this, as shown in FIG. 6, the short liquid level gauges 4A and 4A are slightly overlapped. You may connect while doing. Alternatively, as shown in FIG. 7, a short liquid level gauge 4 may be connected via a flexible hose 27, and the mounting height of the liquid level gauge 4 may be changed according to the liquid level.

The trap section 26 of the degassing section 25 preferably has a large sectional area and a long length. Further, the shape of the trap portion 26 is preferably such that the gas in the treatment liquid can easily escape upward, and for example, as shown by a dotted line in FIG. 4, the upper portion of the trap portion 26 may have a gentle curved shape without corners. In addition, the degassing unit 25
The mounting position of may be inside the pressure vessel 3,
In this case, since the pressures inside and outside the degassing section 25 are equal, it is not necessary to consider the pressure resistance of the degassing section 25. However, in this case, the degassing section 25 must be sized so that it can be accommodated in the pressure vessel 3.

Further, the degassing section 25 may be formed as a bubble separator 28 as shown in FIG. 3, instead of the pipe as described above. The bubble separator 28 is connected to the extraction pipe 13 at each of a side portion 28a and a bottom portion 28b which are separated by a step H. Here, the gas in the treatment liquid that has flowed into the bubble separator 28 rises upward, crosses the step H, and passes through the bottom 2
Since it does not go down to 8b, it does not flow into the liquid level gauge 4 side.

The longer the step H is, and the larger the space 28c above the bubble separator 28 is, the smaller the fluctuation of the liquid level when the stagnant air flows into the bubble separator 28 all at once.
Further, at the initial stage of inflow of the treatment liquid into the bubble separator 28, there is a possibility that foaming at the bottom portion 28b of the bubble separator 28 may flow into the liquid level gauge 4, so that the treatment liquid is previously applied to the side portion of the bubble separator 28. Two
It is safe to fill the level up to around 8a, and at this time, it can be confirmed that the processing liquid is filled by using the valve 24. As shown, valves 29 and 29 are provided near the bubble separator 28. By opening these valves 29 and 29, the treatment liquid in the bubble separator 28 can be drained or the bubble separator 28 can be removed. Have been made available for cleaning.

[0026]

As described above, according to the present invention as set forth in claim 1, a liquid level gauge for measuring the liquid level of the processing liquid introduced into the processing tank is provided in communication with the processing tank. The liquid level height of the processing liquid in the processing tank can be read in real time outside the pressure vessel, and the pressurizing condition can be accurately controlled based on the read liquid level height. Therefore,
Insufficient or excessive injection of processing liquid eliminates time loss and processing liquid loss. In addition, since the liquid level in the processing tank can be checked in real time, the processing liquid is not introduced before depressurization, and the pressure difference with the outside due to depressurization is used to check the liquid level while checking the liquid level during the depressurization process. The treatment liquid can be sucked in.
Therefore, it is possible to reduce the time required to add the processing liquid in the related art. Further, at this time, by shifting the start time of the introduction of the treatment liquid from the start of depressurization in which a lot of bubbles are released from the material to be treated, the foaming of the treatment liquid can be suppressed. Therefore, the treatment liquid can be charged to the upper end of the treatment tank without overflowing, and the number of pieces of wood to be treated that can be mounted in the treatment tank is increased to improve efficiency.

Furthermore, the present invention according to claim 2 is a degassing for separating a gas in the processing liquid from the processing liquid flowing from the processing tank to the liquid level gauge between the processing tank and the liquid level gauge. Since the gas is not separated in the processing liquid by the degassing part and is not accumulated in the processing liquid path to the liquid level gauge due to the provision of the section, the liquid level height between the processing tank and the level gauge is accurate. Can be matched to. Further, the gas does not escape from the liquid level gauge, and the liquid level height in the liquid level gauge can be stabilized.

Further, in the present invention according to claim 3, the degassing portion is formed by a pipe communicating with the extraction pipe and the return pipe, and the connection portion of the pipe with the extraction pipe is a trap portion having a wide cross section. As a result, the gas in the treatment liquid escapes upward in the trap portion, and it is possible to reliably prevent the gas from flowing into the liquid level gauge.

Further, in the present invention as set forth in claim 4, since the degassing section is formed by the bubble separator communicating with the extraction pipe and the return pipe, the gas in the treatment liquid escapes upward in the bubble separator, Inflow to the liquid level gauge can be reliably prevented.

[Brief description of drawings]

FIG. 1 is an overall view of the device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram centering on a liquid level gauge and a degassing unit in FIG.

FIG. 3 is a conceptual diagram centering on a liquid level gauge and a deaerator in another embodiment.

FIG. 4 is a conceptual diagram of a trap section.

FIG. 5 is a conceptual diagram of a liquid level gauge according to another embodiment.

FIG. 6 is a conceptual diagram of a liquid level gauge according to another embodiment.

FIG. 7 is a conceptual diagram of a liquid level gauge according to another embodiment.

[Explanation of symbols]

 1 Wood to be treated 2 Treatment tank 3 Pressure vessel 4 Level gauge 4a Main body 4b Glass plate 4c Scale 5 Body 6 Lid 7 Measuring nozzle 8 Decompression nozzle 9 Pressurizing nozzle 10 Depressurizing device 11 Pressurizing device 12, 13 Draw-out pipe 14, 15 Rail 16 Truck 17, 18 Outlet pipe 19, 27 Flexible hose 20 Return pipe 21 Safety device 22-24 Valve 25 Deaeration part 26 Trap part 28 Bubble separator 29 Valve

Claims (4)

[Claims] 1. A treatment tank for mounting treated wood thereon,
In a liquid injection device for wood, comprising a pressure vessel for accommodating the treatment tank, a liquid level gauge for measuring the liquid level of the treatment liquid introduced into the treatment tank is communicated with the treatment tank. A device for injecting a liquid into wood, which is characterized by being provided as. 2. A degassing unit is provided between the processing tank and the liquid level gauge to separate a gas in the processing liquid from the processing liquid flowing into the liquid level gauge from the processing tank. The liquid injection device for wood according to claim 1, wherein the liquid injection device is for wood. 3. The degassing section is formed by a pipe communicating with a drawing pipe from the processing tank to the liquid level gauge and a return pipe from the liquid level gauge to the processing tank, and the drawing pipe of the piping. The liquid injection device for wood according to claim 2, wherein the connecting portion is a trap portion having a cross section wider than that of the drawing pipe. 4. The degassing section is formed by a bubble separator that communicates with a drawing pipe from the processing tank to the liquid level gauge and a return pipe from the liquid level gauge to the processing tank. Item 3. The liquid injection device for wood according to Item 2.