JP2000317299A - Dilution device having temperature compensation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the flow rate of feed liquid almost fixed irrespective of a change in environmental temperature by making a dilution device have a temperature compensation function by a simple means to compensate a change in kinematic viscosity of the feed liquid by the change in environmental temperature. SOLUTION: In a dilution device, a liquid solvent is jetted into a diffuser 3 from a nozzle 2 in a body 1, and by negative pressure encountered around the nozzle 2, feed liquid in a feed liquid tank T is sucked in, and it is mixed with the liquid solvent jetted from the nozzle 2 to cause the mixture to flow out from the diffuser 3. The dilution device is provided with a variable restriction whose opening degree is adjusted by adjusting a restriction member 17 by an adjuster 14, and between the adjuster and the restriction member, a bar like thermal expansion member 16 consisting of a synthetic resin is inserted. The thermal expansion member adjusts the opening degree of the variable restriction so that a change in kinematic viscosity of the feed liquid by a change in environmental temperature is compensated by thermal expansion to make the flow rate of the feed liquid almost fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diluting device having a temperature compensation function suitable for diluting a cutting oil, a grinding oil, a cleaning agent, a rust inhibitor, a water-soluble surfactant, a water-soluble organic solvent, and the like. It is about.

[0002]

2. Description of the Related Art As shown in FIG. 5, a diffuser 53 is provided in a body 51 connected to a water supply source S from a nozzle 52.
Water is spouted out, and the negative pressure generated around the nozzle 52 due to the spout causes the stock solution to be diluted to be sucked from the stock solution container T, and it is mixed with the water spouted from the nozzle 52 and diffused from the diffuser 53. A diluting device for delivering as a diluent has been conventionally used. This dilution device
For example, it is effectively used for dilution with a water-soluble cutting oil of a machine tool or an industrial water such as a water-soluble cleaning liquid.

In this diluting apparatus, a variable throttle 56 whose opening is adjusted by adjusting a throttle member (spool) 57 by an adjuster 58 is provided in a flow path 55 for supplying a stock solution from a stock solution container T around a nozzle 52. Is provided so that the flow rate of the stock solution can be adjusted. However, depending on the type of the stock solution, the kinematic viscosity of the stock solution greatly changes due to the temperature change of the stock solution accompanying the environmental temperature change. As can be seen from the graph of FIG. 6, the concentration of the diluent varies greatly.

More specifically, when the diluting device is used in a place where there is a large temperature difference between summer and winter, such as in a factory having industrial equipment, the pressure of water supplied to the nozzle 52 and the pressure of the water are controlled. If the opening of the throttle 56 is kept constant, the kinematic viscosity decreases at high temperatures in summer, so that the
The flow rate of the undiluted solution passing through the water increases, and conversely, the flow rate decreases at low temperatures in winter, so that the concentration cannot always be kept constant. The fact that the dilution ratio changes depending on the environmental temperature causes various inconveniences.For example, when the concentration of the diluent is high at a high temperature, the amount of the diluent used not only increases, so that the diluent cost is increased, but also the diluent is increased. The tendency is further strengthened by the evaporation due to the rise in temperature, and when the dilution concentration becomes high, the diluent tank may overflow due to bubbling or the like. In addition, when the dilution concentration of the water-soluble cutting oil decreases in winter, there arises a problem that the cutting performance is reduced and the life of the cutting tool is reduced. In order to correct these, it is necessary to manually operate the adjuster 58 and adjust the aperture by the aperture member 57 according to the season or the environmental temperature.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and its technical problem is to basically provide the above-mentioned conventional diluting apparatus with a temperature compensation function. It is another object of the present invention to provide a diluting apparatus which compensates for a change in kinematic viscosity of a stock solution due to a change in environmental temperature and can maintain a flow rate of the stock solution substantially constant regardless of a change in environmental temperature. A more specific technical object of the present invention is to provide an effective temperature compensation function to the above-mentioned dilution device by extremely simple means.

[0006]

In order to solve the above-mentioned problems, the present invention provides a method in which a solvent is ejected from a nozzle to a diffuser in a body connected to a liquid supply source, and the solvent is generated around the nozzle with the ejection. In a diluting device which sucks a stock solution to be diluted by negative pressure, mixes it with a solvent solution ejected from the nozzle, and flows out from a diffuser,
In the flow path for supplying the undiluted solution around the nozzle, a variable throttle whose opening is adjusted by adjusting the throttle member by the adjuster is provided. Between the adjuster and the throttle member, a thermal expansion causes a change in environmental temperature. A thermal expansion member for adjusting the opening degree of the variable throttle so as to make the flow rate of the stock solution substantially constant by compensating for the fluctuation of the kinematic viscosity of the stock solution is provided.

[0007] In the dilution device, an adjuster provided with an operation dial and a throttle member for adjusting the opening of the variable throttle are connected by a bar-shaped thermal expansion member, and the throttle member is
It is effective to adjust the degree of opening of the variable throttle by expansion and contraction in the longitudinal direction of the thermal expansion member. In particular, it is effective to use a rod-shaped synthetic resin for the thermal expansion member.

In the diluting apparatus having the above-described structure, a thermal expansion member having a high coefficient of thermal expansion is incorporated between the adjuster for adjusting the opening degree of the variable throttle and the throttle member constituting the variable throttle so that the environmental temperature is low. In the case of, the flow path of the stock solution is expanded by the contraction of the thermal expansion member itself to suppress a decrease in the inflow of the stock solution whose kinematic viscosity has increased. By narrowing the path, an increase in the inflow of the stock solution due to a decrease in kinematic viscosity is suppressed. In particular, by adopting a configuration in which the adjuster provided with the operation dial and the throttle member are connected by a bar-shaped thermal expansion member made of a synthetic resin, a bar-shaped synthetic resin member is simply added to a known diluting device. With the simple configuration described above, it is possible to obtain a temperature-compensated diluting device that automatically adjusts the opening degree of the variable throttle according to a change in environmental temperature.

[0009]

FIG. 1 shows an embodiment of a diluting apparatus having a temperature compensating function according to the present invention. This diluting device basically has a configuration for diluting the undiluted solution according to the same principle as the above-mentioned conventional example, that is, water or other appropriate material is supplied from the nozzle 2 to the diffuser 3 in the body 1 connected to the liquid supply source S. The solvent liquid is ejected, and the negative pressure generated in the negative pressure generating section 4 around the nozzle 2 accompanying the ejection causes the undiluted solution to be sucked from the undiluted solution container T, and the solvent liquid ejected from the nozzle 2 And the mixture in the pressure release section 5 of the diffuser 3 and is sent out as a required diluent.

In the above-mentioned dilution device, the body 1
Further, a valve body 11 constituting a variable throttle is connected via a nipple 10 communicating with a negative pressure generating section 4 around the nozzle 2. The valve body 11 has a valve hole 1 penetrating therethrough.
2 and the nipple 10 is provided at an intermediate portion of the valve hole 12.
A flow passage hole 13 communicating with the inside is opened, and a shaft portion 14 of an adjuster 14 having an operation dial 14 a is provided at one end of the valve hole 12.
b is screwed in with an adjusting screw 15 provided therearound,
A throttle member 17 is connected to a shaft portion 14b of the adjuster 14 via a thermal expansion member 16 described in detail below. The throttle member 17 is fitted and inserted into the valve hole 12 via a seal member 18, and a spring 19 is provided with a flange portion 17 a and a stepped portion 12 a in the valve hole 12 compressed as a spring seat.
The variable throttle is urged toward the thermal expansion member 16 and adjusts the opening of the flow passage hole 13 by adjusting the screw of the adjuster 14.

A hose nipple 20 is connected to the other end of the valve hole 12, and the valve hole 12 is connected to the stock solution container T by a hose 21 connected thereto.
Therefore, the flow path for supplying the undiluted solution from the undiluted solution container T to the negative pressure generating section 4 around the nozzle 2 is formed by the hose nipple 2.
0, formed through the valve hole 12 and the flow path hole 13 in the valve body 11 and the nipple 10.

The adjuster 14 has an operation dial 14a and a shaft portion 14b fixed by a set screw 14c, and the adjustment screw 15 allows the valve hole 12 in the valve body 11 to be fixed.
The opening degree of the flow path hole 13 by the throttle member 17, that is, the dilution concentration is set according to the screwing position of the adjuster 14 by the adjusting screw 15. Further, as can be seen from FIG.
A scale 22 is provided around the operation dial 14a, and an index 23 is displayed at a position corresponding to the scale 22 on the valve body 11 so that the scale 22 can be read. Further, a fixing screw 24 for fixing the adjuster 14 at a predetermined adjustment position can be screwed from the outer surface of the valve body 11 toward the shaft portion 14b of the adjuster 14. In FIG. 1, reference numeral 26 denotes a zero-point setting screw provided on the operation dial 14a.

The thermal expansion member 16 interposed between the adjuster 14 and the throttle member 17 for adjusting the opening of the flow passage hole 13 is
It is formed in a rod shape of a required length by synthetic resin, and both ends are fitted into a connecting hole provided in the shaft portion 14a of the adjuster 14 and the throttle member 17, and the kinematic viscosity of the undiluted solution due to the environmental temperature change due to its thermal expansion. The opening degree of the variable throttle, that is, the position of the throttle member 17 with respect to the flow path hole 13 is adjusted so as to compensate for the fluctuation and make the stock solution flow rate substantially constant regardless of the fluctuation in the environmental temperature.

[0014] More specifically, the thermal expansion member 16 of the rod-shaped, for example, polypropylene (expansion coefficient of 110 × 10 ^-6 to 17 × 10 ^-6 stainless [1 /
° C]) and other synthetic resins having a relatively large coefficient of thermal expansion. FIG. 2 shows a temperature characteristic of elongation due to linear expansion of a thermal expansion member (A to C materials, each having a length of 50 mm) made of a plurality of types of synthetic resins. As can be seen, the amount of expansion and contraction due to the temperature of the thermal expansion member, that is, the amount of movement depending on the temperature of the throttle member 17 is determined by the thermal expansion coefficient and the length of the synthetic resin constituting the thermal expansion member 16 itself. Accordingly, the flow path hole 1 formed by the throttle member 17
3 is set.

FIG. 3 shows the temperature characteristics of the dilution concentration when the same stock solution is diluted using the above-mentioned plural types of thermal expansion members (A to C materials). As shown in FIG. The amount of expansion and contraction due to the temperature of the member changes almost proportionally according to the synthetic resin material constituting the member and the length thereof. By selecting the material and length, A in FIG.
It can be seen that, like the material, the dilution concentration can be kept substantially constant regardless of the temperature.

As can be seen from the above description, the thermal expansion coefficient and the length of the thermal expansion member 16 in this dilution device are:
It is necessary to determine according to the temperature characteristic of the kinematic viscosity of the stock solution to be diluted, that is, the opening degree of the flow path hole 13 is set so that a constant flow rate is always obtained according to the temperature change of the kinematic viscosity of the stock solution. Therefore, it is necessary to determine the material (coefficient of thermal expansion) and the length of the thermal expansion member 16 so as to give the throttle member 17 a movement amount for performing the necessary temperature compensation. From this, when the stock solution to be diluted changes,
It can be seen that the dilution concentration can be adjusted by changing the material of the thermal expansion member 16 or changing its length.

As described above, when the rod-shaped thermal expansion member 16 having a required expansion coefficient and length is interposed between the adjuster 14 and the throttle member 17, when the environmental temperature is low in winter or the like, the thermal expansion thereof is prevented. The contraction of the member 16 itself causes the throttle member 17 to
3 is moved in the opening direction (upward in FIG. 1) to widen the undiluted solution flow path, so that a solvent liquid such as water is ejected from the nozzle 2 to the diffuser 3 from the nozzle 2 in the body 1 connected to the water supply source S. When the negative pressure generating part 4 around the nozzle 2 sucks the undiluted solution from the undiluted solution container T, even if the kinematic viscosity of the undiluted solution is increased due to the temperature drop, the inflow rate does not decrease and the sucked constant flow rate is maintained. Is mixed with the solvent liquid ejected from the nozzle 2 and sent out from the diffuser 3 as an initial diluting liquid.

On the other hand, when the environmental temperature becomes high in summer or the like, the expansion member 16 itself expands and the diaphragm member 1
7 moves in the direction of opening the flow path hole 13 (downward in FIG. 1) to narrow the stock solution flow path, thereby suppressing an increase in stock solution inflow due to a decrease in kinematic viscosity, and the body 1 connected to the water supply source S. When the solvent liquid such as water is ejected from the nozzle 2 to the diffuser 3 from the nozzle 2 to suck the undiluted solution from the undiluted solution container T, even if the kinematic viscosity of the undiluted solution is decreased due to the temperature rise, the inflow amount is not increased. The concentration of the diluent becomes almost constant regardless of the ambient temperature (see FIG. 6). Therefore, unlike the known diluting apparatus, it is not necessary to manually operate the adjuster and adjust the aperture by the aperture member according to the season or the environmental temperature.

FIG. 4 shows an example of a use state of the above-mentioned diluting apparatus. In this use example, a water supply source S for industrial water is provided.
The body 1 of the diluting device 30 having the above-described configuration is connected via an electromagnetic valve 31 and a union 32.
1 is connected to the stock solution container T by a hose 21, and the diffuser 3 is opened above the diluent tank 34. Reference numeral 35 denotes a bypass valve. The diluting liquid of the cutting oil or the cleaning liquid filled in the diluting liquid tank 34 is sent to required mechanical equipment 38 via a pump 37, and is discharged from a nozzle 39 to a necessary portion.
Reflux to 4.

[0020]

According to the dilution apparatus having a temperature compensation function of the present invention described in detail above, the following effects can be expected. 1. Even if the environmental temperature fluctuates, a constant concentration of the diluent can be sent out without relying on humans, so that the quality of the diluent is stabilized. 2. Elimination of variation in the amount of undiluted solution due to temperature difference,
Not only can troubles due to fluctuations in the dilution concentration be eliminated, but also costs can be reduced. 3. With a very simple structure in which the adjuster and the throttle member are simply connected by a rod-shaped thermal expansion member made of a synthetic resin, compared to the conventional dilution device, the opening degree of the variable throttle according to the environmental temperature change Can be automatically adjusted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a diluting device according to the present invention.

FIG. 2 is a graph showing temperature characteristics of elongation of a thermal expansion member.

FIG. 3 is a graph showing an outline of a temperature characteristic of a dilution concentration.

FIG. 4 is a schematic configuration diagram illustrating an example of a use state of the dilution device.

FIG. 5 is a cross-sectional view of a conventionally used diluting device.

FIG. 6 is a graph showing the relationship between the stock solution temperature and the dilution concentration of the diluent in the diluting apparatuses of the present invention and the conventional example (FIG. 5).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Nozzle 3 Diffuser 14 Adjuster 14a Operation dial 14b Shaft part 15 Adjustment screw 16 Thermal expansion member 17 Throttle member S Liquid supply source T Stock solution container

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhisa Kimura Ibaraki Prefecture Tsukuba-gun Yawahara-mura Kinnodai 4-2-2 Inside SMC Corporation Tsukuba Technical Center (72) Inventor Takayuki Ishihara Toyota Toyota City, Aichi Prefecture No. 1 Toyota Motor Co., Ltd. (72) Inventor Hitoshi Suzuki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Miki Aima 6-1, Meiwacho Toyota City, Aichi Prefecture 3H057 AA12 BB03 BB06 BB09 BB25 CC07 DD14 EE02 FA22 FC05 FD14 HH02 4G068 AA02 AB11 AC16 AD37 AF01 AF40

Claims (3)

[Claims] 1. A method according to claim 1, wherein a solvent liquid is jetted from a nozzle to a diffuser in a body connected to a liquid supply source, and a stock solution to be diluted is sucked by a negative pressure generated around the nozzle due to the jetting. A diluting device that mixes with the solvent liquid ejected from the diluent and flows out of the diffuser, wherein a variable throttle whose opening is adjusted by adjusting a throttle member by a regulator is provided in a flow path that supplies the undiluted solution around the nozzle; A thermal expansion member between the adjuster and the throttle member, which adjusts the opening degree of the variable throttle so as to make the flow rate of the raw solution substantially constant by compensating for the fluctuation of the kinematic viscosity of the stock solution due to the environmental temperature change due to thermal expansion. A dilution device having a temperature compensation function. 2. An adjusting device having an operation dial and an aperture member for adjusting an opening of a variable aperture are connected by a rod-shaped thermal expansion member, and the aperture member is expanded and contracted in a longitudinal direction of the thermal expansion member. The diluting device having a temperature compensating function according to claim 1, wherein the opening of the variable throttle is adjusted by using (1). 3. A diluting device having a temperature compensating function according to claim 2, wherein the thermal expansion member is made of a rod-shaped synthetic resin.