JP2016056882A - Silicone oil filling method and silicone oil filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve some problems found in the prior art silicone oil filling method that bubbles of dissolved gas remain in a filled container when silicone oil is vacuum replaced in the filled container caused by occurrence of reduction in pressure at a location where a flow speed is generated in a filling nozzle due to work under vacuum and a reduction in pressure caused by occurrence of potential energy if a head drop occurs between the filling nozzle and the filled container.SOLUTION: A vacuum tank having an airtight deaeration tank/filled container internally contacted therewith and a filling gun are constituted in series. With this arrangement as above, silicone oil of high quality can always be filled in an accurate and high precise manner without making bubbles of dissolved gas that could not be deaerated at the time of filling under deaeration, decompression, forced feeding, filling and adjustment steps and it is possible to have a surplus adjustment of prevention of dissolved gas bubble formation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a silicone oil filling method and apparatus for vacuum-displacing silicone oil into a shock absorber using the viscosity of silicone oil.

  A shock absorber that uses the viscosity of silicone oil is one that fills a sealed container with silicone oil and absorbs part or all of the impact and energy of the object by the viscosity of the silicone oil. It is desirable that it is completely filled.

  Generally, when filling a sealed container with silicone oil, the structure inside the container may be complicated, and it cannot be filled efficiently by filling in the atmosphere. A method of closing the filling port under the atmosphere is employed.

  However, when the silicone oil comes into contact with the evacuated container, the gas dissolved in the silicone oil is foamed and remains as it is in the container as it is.

  Further, even when the evacuation in the container is reduced to such an extent that the dissolved gas does not foam, the residual gas amount in the container greatly affects, and the filling amount accuracy is lowered.

  For this reason, when silicone oil is accurately filled into a container evacuated at a high degree of vacuum, dissolved gas should be prevented from foaming as much as possible even when it comes into contact with the vacuum atmosphere in the container when filling with silicone oil. is necessary.

  Therefore, conventionally, as a pretreatment at the time of filling, the liquid was allowed to stand under reduced pressure to reduce the dissolved gas concentration.

  That is, the liquid filling method that prevents foaming of the dissolved gas without lowering the saturated dissolution amount of the dissolved gas in the liquid by lowering the degree of vacuum of the filling region replacing the liquid than the degree of vacuum during degassing (For example, refer to Patent Document 1).

  In addition, there is a method in which a stirring mechanism is provided in a deaeration tank so that deaeration can be performed efficiently (see, for example, Patent Document 2).

JP 2008-36963 A JP-A-2005-273908

  However, when the silicone oil is vacuum-replaced in a sealed container, the silicone oil flows through the filling nozzle and fills the container with speed. At this time, since the inside of the container is vacuum, the tip of the filling nozzle is under vacuum, and the pressure is reduced at the portion where the flow has occurred in the nozzle, and the dissolved gas is foamed and remains in the filling container.

  In addition, if there is a drop between the filling nozzle and the filling container, the filling container is filled with potential energy, and even in this case, a flow is generated, the pressure is lowered, and foaming of dissolved gas occurs.

  When the pressure of the part where the flow is generated under vacuum and the dissolved gas is foamed, the degree of vacuum during degassing must be lower (higher vacuum) than the pressure drop caused by the flow. Quantitatively grasping it and reflecting it in the operation of the apparatus makes the control complicated and difficult to make into an apparatus. Therefore, it is extremely possible to prevent foaming of dissolved gas of silicone oil only by deaeration by standing and only by a deaeration method that provides a difference in vacuum between deaeration and filling in the invention described in Patent Document 1, for example. Have difficulty.

  In the invention described in Patent Document 2, the flow rate of liquid during stirring is compared with the flow rate in the filling nozzle during filling, and the relative flow rate is not adjusted. It may be lower than the flow velocity in the filling nozzle at the time, and in this case, the gas saturation dissolution amount of the liquid is lowered at the time of filling, and the dissolved gas may be foamed.

  That is, this is based on the fact that the inventions described in the prior art documents do not consider the pressure drop due to the flow velocity at all.

  The present invention is intended to solve the problems of such a conventional configuration, and can be filled with high-quality silicone oil without foaming dissolved gas, and has an adjustment range for preventing dissolved gas foaming. It was developed with the purpose of realizing.

  Thus, the gist of the present invention to solve the above-mentioned problems and achieve the object is to forcefully generate a flow rate in the silicone oil in a silicone oil liquid under reduced pressure, A decompression-filled region in which the dissolved gas of the silicone oil is foamed and the silicone oil that has been degassed by forcibly breaking the foam is pumped to the filling gun, and the nozzle of the filling gun is placed under vacuum decompression When the filling gun nozzle is opened and filled with the degassed silicone oil, the flow rate generated in the silicone oil and the flow rate of the silicone oil generated in the filling gun nozzle are filled in the filling region. To provide a silicone oil filling method and apparatus for replacing and filling silicone oil in a container to be filled in a vacuum atmosphere by comparing and adjusting the difference. That.

  In short, the present invention is a silicone oil filling method and apparatus for reducing the filling area of a shock absorber using the viscosity of silicone oil and replacing it with silicone oil. Forcibly generating a foamed dissolved gas in the silicone oil, forcibly destroying the foam and degassing, depressurizing step for depressurizing the filling region, and degassing. A pressure-feeding step of pumping the gasified silicone oil liquid to the filling gun, a filling step of opening and filling the pressure-reduced filling region with the filling gun in which the degassed silicone oil liquid is pumped open, and the degassing step. Silicone oil generated in the nozzle of the filling gun in the filling process and the flow rate generated in the silicone oil by moving the object in the liquid under reduced pressure Those made through an adjustment step of adjusting a difference by comparing the flow rate.

The operation of the above problem solving means is as follows.
In other words, in the depressurized liquid in the degassing step, it is combined with effectively foaming the dissolved gas of the silicone oil by forcibly moving the object and forcibly destroying the foaming under the reduced pressure. Effectively degassed high quality silicone oil can be pumped to the filling gun.

  In the depressurized liquid in the degassing step, the flow rate generated in the silicone oil by forcibly moving the object is adjusted faster than the flow rate of the silicone oil generated in the nozzle of the filling gun at the time of filling. Thus, even when a flow occurs in the filling nozzle during filling and the pressure drops, the degree of vacuum in the deaeration process is equal to or higher than the degree of vacuum in the pressure reduction process, and no filling unevenness occurs.

  Also, by increasing the moving speed of the object in the liquid under vacuum, the relative local pressure drop is increased, the amount of dissolved gas is forcibly reduced, and the feed pressure generated by the air pressure is adjusted. In addition, the flow rate of the silicone oil in the nozzle at the time of filling can be slowed down and the opening of the filling gun can be adjusted to slow down the flow rate of the silicone oil in the filling nozzle at the time of filling.

  Therefore, by adjusting the flow rate and adjusting the degree of vacuum to the same level or higher as described above, it is possible to prevent foaming of the gas dissolved in the silicone oil at the time of filling, and the dissolved gas that could not be degassed at the time of filling. The gas can be filled without foaming, and an adjustment range for preventing dissolved gas foaming can be provided.

  As described above, according to the unique configuration of the present invention, in filling the silicone oil into the shock absorber using the viscosity of the silicone oil, the object is moved in the depressurized liquid in the degassing step and generated in the silicone oil. By adjusting the flow rate faster than the flow rate of the silicone oil generated in the nozzle of the filling gun in the filling step, a difference is made in the relative local pressure drop due to the flow, and the degree of vacuum in the degassing step is If it is equal to or higher than the degree of vacuum, the dissolved gas that could not be degassed at the time of filling can be filled without foaming.

And the adjustment range of dissolved gas foaming prevention can be given by adjusting the speed at which the object is moved in the liquid under reduced pressure, adjusting the feed pressure generated by the air pressure, and adjusting the opening of the filling gun.
In short, according to the present invention, perfect adjustment can be made with respect to the relative change in flow velocity and the amount of pressure drop due to the flow velocity.

  For the above reasons, according to the present invention, it is possible to accurately and highly accurately fill the filling container with silicone oil while maintaining high quality.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory front sectional drawing of the apparatus which shows one Example which concerns on this invention. The explanatory front sectional view at the time of filling of the device which shows one example concerning the present invention. The partial cross section front view of the filling gun which shows one Example which concerns on this invention.

  Hereinafter, a specific configuration for carrying out the present invention will be described with reference to FIGS. 1, 2, and 3.

  That is, this apparatus exhibits a series of inseparable configurations of the vacuum tank 20 and the filling gun 22 in which the sealed deaeration tank 12 and the filling container 21 are provided.

  In the sealed deaeration tank 12, the wings 11 and 11 and the foam face 10 that are attached to the rotary shaft 28 directly connected to the motor 13 installed outside are set in a step shape, and at the upper part in the sealed deaeration tank 12. A pressure feeding hose 29, a pressure regulator hose 30, a vacuum pump hose 31, a vacuum break hose 32, and a vacuum gauge hose 33 are provided.

  Note that the pressure feed hose 29 includes the pressure feed pump 1 and the pressure feed valve 7, the pressure regulator hose 30 includes the pressure regulator 2 and the pressure valve 4, and the vacuum pump hose 31 includes the vacuum pump 3 and the vacuum valve 5. A vacuum breaker 34 and a vacuum break valve 6 are set in the break hose 32, and a vacuum gauge 9 is set in the vacuum gauge hose 33.

  In the vacuum tank 20, a vacuum pump hose 35, a vacuum breaker valve hose 36 and a vacuum gauge hose 37 that lead to the upper part thereof are provided, and a filling container 21 having a filling port 38 is set.

  The vacuum pump hose 35 includes a vacuum pump 15 and a vacuum valve 16, the vacuum breaker valve hose 36 includes a vacuum breaker 39 and a vacuum breaker valve 17, and the vacuum gauge hose 37 includes a vacuum gauge 18.

  The filling gun 22 is connected to the silicone oil inlet 40 and the lower part in the sealed deaeration tank 12 via the filling path hose 14, and the nozzle 25 of the filling gun 22 closely matches the filling port 38 of the filling container 21. The vacuum chamber 20 is set at the top. The filling path hose 14 includes a filling path valve 8 on the sealed deaeration tank 12 side and a pressure gauge 19 on the filling gun 22 side.

  In this way, the vacuum tank 20 and the filling gun 22 in which the deaerated sealed tank 12 and the filled container 21 are provided are configured inseparably.

Next, the operation of the above configuration will be described.
First, the silicone oil 41 is pumped into the sealed deaeration tank 12 through the pumping hose 29 by the operation of the pumping pump 1.

  At this time, the pressurization valve 4, the vacuum valve 5 and the filling path valve 8 installed in the hermetic deaeration tank 12 are closed, and the vacuum breaker valve 6 and the pressure feed valve 7 are opened. Further, the vacuum pump 3 and the motor 13 are stopped.

  When the liquid level of the silicone oil 41 in the sealed deaeration tank 12 reaches an amount that satisfies the wings 11, 11, the pumping pump 1 is stopped and the pumping valve 7 is closed, and the silicone oil 41 is pumped to the sealed deaeration tank 12. Ends.

  Next, in order to degas the silicone oil 41 in the sealed deaeration tank 12, the vacuum breaker valve 6 is closed to make the sealed deaeration tank 12 sealed. Further, the vacuum valve 5 is opened and the vacuum pump 3 is operated, and the sealed deaeration tank 12 is evacuated to maintain airtightness.

  When the vacuum gauge 9 detects that the degree of vacuum in the sealed deaeration tank 12 has increased to a level equal to or higher than the degree of vacuum at the time of vacuum filling, the motor 13 is activated, and the foam face 10 and the silicone oil 41 interlocked with the motor 13 are operated. The wings 11, 11 existing in the liquid are rotated in the same direction according to the rotation axis 28.

  The silicone oil 41 existing under vacuum generates a flow velocity due to the rotation of the wings 11, 11, a relative local pressure drop occurs in the liquid of the silicone oil 41, and the dissolved gas is removed while being forced to foam. I care.

  Therefore, the rotation of the wings 11 and 11 can be regarded as the movement (rotation) of the object (the wings 11 and 11). In other words, this is not limited to the shape of the wings 11, 11, etc., but a rod or plate or the like is fixed to the rotary shaft 28, or simply a moving animal body submerged in the liquid of the silicone oil 41. Also, the flow rate can be generated in the silicone oil 41.

  At this time, when the amount of foaming from the silicone oil 41 is larger than the exhaust amount of the vacuum pump 3, the degree of vacuum in the deaeration tank 12 is lowered. Further, the bubbles generated on the liquid surface of the silicone oil 41 under reduced pressure are efficiently destroyed and forcibly degassed by the contact caused by the rotation of the foam face 10.

  In short, in the sealed degassing tank 12 under reduced pressure, the dissolved gas of the silicone oil 41 is forcibly foamed and forcibly degassed at the same time, so that reasonably high quality silicone oil is obtained.

  In this way, when foaming from the silicone oil 41 is settled, the degree of vacuum in the sealed deaeration tank 12 rises, and the inside of the sealed deaeration tank 12 again reaches a degree of vacuum equal to or higher than the degree of vacuum at the time of vacuum filling. .

  When the vacuum gauge 9 detects this degree of vacuum, the vacuum pump 3 and the motor 13 are stopped, the vacuum breaker valve 6 is opened, and the inside of the sealed deaeration tank 12 is broken.

  After the vacuum gauge 9 detects the atmospheric pressure, the vacuum valve 5 and the vacuum break valve 6 are closed, and the sealed deaeration tank 12 is sealed.

  The vacuum gauge 9 accurately determines that degassing has been completed by moving the object in the liquid under vacuum, generating a flow rate in the silicone oil 41, and monitoring the degree of vacuum that changes as the dissolved gas foams. it can.

  And the deaeration process is complete | finished by opening the pressurization valve 4 and pressurizing the inside of the sealing deaeration tank 12 by operation of the pressurization regulator 2. FIG.

  Next, the filling path valve 8 is opened, and the silicone oil 41 in the sealed deaeration tank 12 is pumped to the silicone oil inlet 40 of the filling gun 22 via the filling path hose 14.

  At this time, since the needle 23 of the filling gun 22 is pressed against the seat 24 by the needle opening / closing cylinder 26, the pressure-fed silicone oil 41 is not discharged from the nozzle 25.

The opening of the needle opening / closing cylinder 26 is performed by a needle opening adjusting screw 27, and the adjustment of the pumping pressure can be performed by the amount of operation of the pressurizing regulator 2, so that the silicone in the nozzle 25 at the time of filling by pumping with air pressure is used. The flow rate of the oil 41 can be adjusted.
The operation of the pumping process for pumping the degassed silicone oil 41 to the filling gun 22 will be described.

  And the to-be-filled container 21 is set in the vacuum chamber 20 in the state which the filling port 38 opened.

  Next, the vacuum break valve 17 provided in the vacuum chamber 20 is closed, the vacuum valve 16 is opened, the vacuum pump 15 is operated, and the filling region of the vacuum chamber 20 and the filling container 21 is evacuated. In this method, an operation process for depressurizing the filling region is performed.

  When the vacuum gauge 18 detects that the vacuum chamber 20 has risen to the degree of vacuum necessary for vacuum filling, the nozzle 25 of the filling gun 22 is closely aligned with the filling port 38 of the filling container 21.

  Thereafter, the needle 23 of the filling gun 22 is pulled upward by the operation of the needle opening / closing cylinder 26, and the silicone oil 41 is filled into the filling region of the filling container 21 through the nozzle 25.

  That is, a filling process is performed in which the needle 23 of the filling gun 22 in which the degassed liquid is pumped into the decompressed filling region is opened and the silicone oil 41 is replaced and filled in the filling container 21.

  At this time, the flow rate of the silicone oil 41 generated in the nozzle 25 is slower than the flow rate generated by the rotation (movement) of the blades 11 and 11 during the deaeration process by the needle opening adjustment screw 27. It has been adjusted.

  That is, the flow rate of the silicone oil 41 generated by the movement of the object in the depressurized liquid in the degassing process and the flow rate of the silicone oil 41 generated in the nozzle 25 of the filling gun 22 in the filling process are compared. This is an adjustment process for adjusting the difference.

  When the pressure gauge 19 provided in the filling path hose 14 detects that the inside of the deaeration tank 12 becomes the same value as the pressure value of the pressurizing regulator 2, it is determined that the filling is completed, and the needle 23 of the filling gun 22 is The needle oil is pressed against the sheet 24 by the cylinder 26 and the silicone oil 41 is not discharged from the nozzle 25, and the filling stops.

  By adjusting the opening degree of the needle opening adjustment screw 27 of the filling gun 22, the flow rate of the silicone oil 41 in the nozzle 25 at the time of filling can be adjusted, and the occurrence of cavitation due to the opening of the needle 23 of the filling gun 22 is prevented. It can be prevented as much as possible.

  Next, the vacuum break valve 17 is opened, the vacuum pump 15 is stopped, and the vacuum chamber 20 is broken.

  When the vacuum valve 16 is closed after the atmospheric pressure is detected by the vacuum gauge 18, the filling gun 22 is raised and the nozzle 25 is detached from the filling container 21.

  Then, the filling container 21 filled with the silicone oil 41 is taken out from the vacuum tank 20, and the filling port 38 is closed to complete the vacuum replacement filling.

  A degassing step is periodically performed according to the re-dissolution of the silicone oil 41 after degassing.

  According to the present embodiment, the filling container 21 can be filled with high-quality silicone oil that has been deaerated and has no foaming, and the filling accuracy is extremely accurate. Therefore, when the filled container 21 is applied to a shock absorber, impact energy and the like can be efficiently absorbed by the viscosity of the silicone oil and its elasticity. Can be provided as.

DESCRIPTION OF SYMBOLS 1 Pressure feed pump 2 Pressure regulator 3 Vacuum pump 4 Pressure valve 5 Vacuum valve 6 Vacuum break valve 7 Pressure feed valve 8 Filling path valve 9 Vacuum gauge 10 Foam face 11 feather 12 Sealed deaeration tank 13 Motor 14 Filling path hose 15 Vacuum pump 16 Vacuum valve 17 Vacuum break valve 18 Vacuum gauge 19 Pressure gauge 20 Vacuum tank 21 Filled container 22 Filling gun 25 Nozzle 27 Needle opening adjustment screw 28 Rotating shaft 29 Pressure feeding hose 30 Pressure regulator hose 31 Vacuum pump hose 33 Vacuum gauge hose 35 Vacuum pump hose 36 Vacuum break valve hose 37 Vacuum gauge hose 38 Filling port 40 Silicone oil inlet 41 Silicone oil

Claims (5)

  Fills the silicone oil that has been degassed by forcibly destroying the foamed foam by forcibly generating a flow rate in the silicone oil under reduced pressure to forcibly generate the flow rate of the silicone oil. While pumping to the gun, the nozzle of the filling gun is positioned in a reduced pressure filling region placed under vacuum decompression, and the degassed silicone oil fills the filling region by opening the nozzle of the filling gun. Comparing and adjusting the difference between the flow rate generated in the silicone oil and the flow rate of the silicone oil generated in the nozzle of the filling gun, the filling container is filled with silicone oil in a vacuum atmosphere. Silicone oil filling method.   The method for filling silicone oil according to claim 1, wherein a forced local flow rate drop is generated by forcibly generating a flow rate in the silicone oil, and the dissolved gas in the silicone oil is foamed.   The method of filling silicone oil according to claim 1 or 2, wherein the flow rate generated in the silicone oil is adjusted faster than the flow rate of silicone oil generated in the nozzle of the filling gun during filling.   The method for filling silicone oil according to claim 1, 2 or 3, wherein the degree of vacuum at the time of deaeration under reduced pressure is adjusted to be equal to or higher than the degree of vacuum in the filling region at the time of filling under reduced pressure.   It consists of a sealed deaeration tank (12), a vacuum tank (20) and a filling gun (22). Inside the sealed deaeration tank (12), a rotary shaft (28) directly connected to an externally installed motor (13). The wings (11) and (11) to be attached to the shaft and the foam face (10) are set in a step shape, and the pressure feed hose (29) and the pressure regulator hose (30) leading to the upper part in the sealed deaeration tank (12) , A vacuum pump hose (31), a vacuum break hose (32) and a vacuum gauge hose (33) are provided, and the vacuum tank (20) has a vacuum pump hose (35), a vacuum break valve hose ( 36) and a vacuum gauge hose (37), and a container (21) to be filled is provided, and the silicone oil inlet (40) of the filling gun (22) having a needle opening adjusting screw (27) Qi The lower part in (12) is connected via the filling path hose (14), and the nozzle (25) of the filling gun (22) closely matches the filling port (38) of the filling container (21). A silicone oil filling device characterized by being set in the upper part of the vacuum chamber (20).

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