JP3149166B2 - Chemical dilution equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical diluting apparatus for mixing a chemical such as a disinfectant with tap water at an appropriate concentration.

[0002]

2. Description of the Related Art Conventionally, in order to sterilize and disinfect dishes and fresh vegetables at the time of washing them, a chemical diluting apparatus for mixing a chemical such as a disinfectant with tap water has been known.
No. etc. are provided. Here, a conventionally known configuration is shown in FIG. In FIG. 7, an ejector 14 for mixing tap water and a chemical such as a disinfectant is attached to a tap faucet 10 via a tap holder 12. The tank 16 containing a chemical such as a disinfectant is connected to a concentration controller 20 via a hose 18, and the concentration controller 20 is connected to the ejector 14 via a hose 22. The concentration controller 20 includes a variable flow rate adjusting valve 24 such as a needle valve for adjusting the flow rate of the chemical solution from the tank 16, and a check valve for preventing tap water from flowing from the ejector 14 to the tank 16. A valve 26 is provided.

As shown in FIG. 8, a water passage 28 is provided inside the ejector 14 so as to communicate with the tap faucet 10 and through which tap water passes, and a venturi portion 30 and a venturi portion are provided in the water passage 28. A mixing space 32 having a larger cross-sectional area is formed downstream of the mixing space 30, and a water discharge unit 34 is provided downstream of the mixing space 32. Venturi Department 30
When the tap water passes through the water passage 28, a negative pressure is generated at a position where the tap water flows from the venturi section 30 into the mixing space 32. A chemical solution communication passage 36 communicating with the hose 22 is connected to a position communicating with the mixing space 32 from the venturi section 30. When tap water is supplied to the ejector 14, a chemical solution is supplied from the tank 16 to the mixing space 32 via the hose 22 by the negative pressure generated in the negative pressure generating section, and the chemical solution is mixed with the tap water in the mixing space 32. You. The amount of the chemical solution supplied to the mixing space 32 is adjusted by the variable flow rate control valve 24, and becomes a mixed water having a desired concentration in the mixing space 32, and the mixed water is discharged from the water discharge unit 34 to the outside.

[0004]

In the conventional diluting apparatus,
As the flow rate of tap water increases, the dilution concentration of the chemical tends to increase. This tendency causes the tank 16 to move the ejector 14
It was more remarkable as it was placed lower, and the difference in height between the liquid surface of the tank 16 and the position of the liquid medicine entering the ejector 14 (the position of the liquid medicine communication passage 36 to the mixing space 32) was larger. Conventionally, in general, the tank 16 is placed on a sink, and the ejector 14 attached to the faucet 10 is often arranged about 15 cm above the sink. Here, in FIG. 8, the height difference is −150 mm (the liquid level of the tank 16 is lower by 150 mm than the position where the chemical is supplied to the ejector 14).
The characteristics of the flow rate and dilution concentration of tap water in the case of (1) are indicated by crosses. According to the characteristic diagram of FIG. 9 , it can be seen that as the flow rate of tap water increases, the dilution concentration of the chemical solution also increases.

Since the tank 16 is arranged at an arbitrary height from above to below the ejector 14, the tank 1
In order to obtain a desired dilution concentration regardless of the relative height of the ejector 14 with respect to the ejector 14, a variable flow control valve 24 such as a needle valve is provided.
Therefore, it was necessary to adjust the flow rate of supplying the chemical solution to the ejector 14. Therefore, not only the cost is increased, but also the adjustment is complicated, and there is a risk of erroneous adjustment.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made to reduce the cost by eliminating the conventionally required variable flow rate control valve, and to reduce the change in the dilution concentration of the chemical solution even when the flow rate of tap water changes. It is intended to provide a chemical solution diluting device capable of reducing the size.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises an ejector having a passage formed in communication with a tap for passing tap water supplied from the tap. The passage has a negative pressure generating section formed by a passage cross-sectional change, and has a tank containing a chemical solution.The tank is connected to the negative pressure generating section via a chemical liquid introducing passage, and the tap water supplied from the faucet is used to communicate with the tank. In a chemical liquid diluting device that generates a negative pressure in a negative pressure generating section of an ejector and introduces a chemical liquid in the tank into the negative pressure generating section through the chemical liquid introduction passage to mix the tap water and the chemical liquid by the negative pressure. A variable flow control valve is not provided in the middle of the chemical solution introduction passage.
And fix the position of the ejector and the tank
A water level holding mechanism to maintain a constant liquid level
The liquid level holding mechanism and the liquid
Communicating with the entrance passage, and dispensing the chemical solution in the tank with the water level holding machine.
And the water is introduced by the negative pressure generated in the negative pressure generating section.
The chemical in the position holding mechanism is ejected from the chemical introduction passage through the ejector.
It is designed to be introduced into the cubicle .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a chemical solution diluting device according to the present invention. An ejector 44 for mixing tap water and a chemical such as a disinfectant is attached to the tap faucet 40 via a tap holder 42. A tank 46 (FIG. 2) for filling a chemical such as a disinfectant into the ejector 44.
Is fixed in the case 48 for housing the inside. Case 48
Is provided with a tank 46 and a water level holding mechanism 5 for holding the level of the chemical solution taken out of the tank 46 at a fixed position.
0 and a hose 52 having one end connected to the water level holding mechanism 50 and the other end connected to the ejector 44. In FIG. 1, the case 48 that houses the tank 46 and the water level holding mechanism 50 is formed separately from the ejector 44, and is fixed to the case 48 and the ejector 44.
Ejector 44 and tank 46 are provided in one case (not shown).
And a water level holding mechanism 50. That is, in the present invention, the tank 46 is set to a position fixed state in which the positional relationship does not change relative to the ejector 44.

In FIG. 2, a water level holding mechanism 50 includes a valve body 56 for opening and closing an opening 54 of a tank 46, and a valve body 56
And a projecting rod 58 extending from the inside to the outside of the opening 54, and supporting the tank 46 from below, with the opening 54 of the tank 46 down and the opening 54 And a liquid tank 60 to be accommodated in the space. A flange 62 is formed on the opposite side of the projecting rod 58 from the valve body 56, and an inward projection 64 is formed on the inner wall of the opening 54 of the tank 46, and the flange 62 and the inward projection 64 are formed.
And a spring 66 is provided therebetween.

When the tank 46 is placed on the liquid tank 60 with its opening 54 downward, the flange 62 contacts the lower surface inside the liquid tank 60 and pushes the valve body 56 upward, so that the opening of the tank 46 is opened. 54 is opened, and the chemical in the tank 46 is supplied into the liquid tank 60. The liquid level of the chemical supplied to the liquid tank 60 rises, and the liquid level of the chemical increases the opening 54 of the tank 46.
Is closed, the supply of the chemical from the tank 46 to the liquid tank 60 is stopped. The chemical in the liquid tank 60 is supplied to the ejector 44 via the hose 52 with the supply of water from the faucet 40.
Supplied to Thereafter, when the liquid level in the liquid tank 60 is lowered, as shown in FIG. 3, the opening 54 of the tank 46 is opened, and the chemical in the tank 46 is supplied into the liquid tank 60. Thereafter, when the liquid level of the chemical rises and the opening 54 of the tank 46 is closed by the liquid level of the chemical, supply of the chemical from the tank 46 to the liquid tank 60 is stopped. As described above, the water level holding mechanism 50 always keeps the liquid level of the chemical solution at a constant height. By always keeping the liquid level of the chemical solution at a constant height, a head difference described later can always be kept constant.

Next, a sectional view of the ejector 44 is shown in FIG. As shown in FIG. 4, the ejector 44 has a water passage 68 that communicates with the faucet 40 side of the tap water and passes the tap water supplied from the faucet 40. In the middle of the water passage 68, a venturi portion 70 and a mixing space 72 having a larger cross-sectional area than the venturi portion 70 immediately downstream of the venturi portion 70.
And are formed. Venturi section 70 and first mixing space 72
These constitute a negative pressure generating section. A water discharge section 74 for discharging water from the ejector 44 to the outside is provided downstream of the mixing space 72. At a position near the venturi section 70 of the mixing space 72 in the ejector 44, a chemical liquid communication passage 76 communicating with the hose 52 is formed. A throttle 78 is formed in the middle of the chemical communication passage 76. A check valve 79 for preventing water from flowing from the ejector 44 to the tank 46 is provided in the middle of the hose 52.

The faucet 40 is opened and tap water is supplied to the ejector 44.
, A negative pressure is generated at a position from the venturi section 70 to the mixing space 72 having a large cross-sectional area. The chemical is supplied to the mixing space 72 through the hose 52 and the chemical communication passage 76 by this negative pressure, and the tap water and the chemical are mixed in the mixing space 72, and the mixed tap water and the chemical are discharged from the water discharge unit 74. It is discharged outside. Mixing space 72 and water discharge section 7
4, a round bar 80 is arranged so as to cross the cross section of the water passage 68. The mixing of the tap water and the drug solution is promoted by the round bar 80, and the mixture is uniformly diluted with the drug solution and the tap water.

In the present invention constructed as described above, the ejector 44 and the tank 46 are in a position fixed state in which their relative positions are not displaced. As a result, the head difference H between the liquid level of the tank 46 and the ejector 44 (the position where the chemical liquid communication passage 76 communicates with the mixing space 72) can be maintained in a constant relationship . In the water level holding mechanism 50 of FIG. 2, the liquid level of the tank 46 means the liquid level in the liquid tank 60, and the height of the liquid level is always constant.

Since the ejector 44 and the tank 46 are in a fixed position where the relative positions of the ejector 44 and the tank 46 are not displaced, the present invention eliminates the need for providing a conventionally required variable flow rate adjusting valve. Also, since the ejector 44 and the tank 46 are in a fixed position, the liquid level of the tank 46 and the ejector 44 are fixed.
Therefore, even if there is a change in the flow rate of tap water, the change in the dilution concentration of the chemical solution is small. For this reason,
The preset dilution 78 makes it possible to obtain a desired dilution concentration.

Here, assuming that the head difference between the height of the liquid level of the tank 46 and the height at which the chemical liquid communication passage 76 communicates with the mixing space 72 is H ( FIG. 2 ), it is preferable that 0 mm ≦ H ≦ 60 mm. . Here shows the characteristics of flow rate and dilution of tap water when the head difference H is 30 mm, in .smallcircle 9. The characteristics indicated by the triangles indicate that the change in dilution concentration is small even when the flow rate of tap water increases. Figure
Although not shown in FIG. 9 , when the head difference H is 0 mm, the dilution concentration slightly increases with an increase in the flow rate as compared with the case where the head difference H is 30 mm, but the degree of increase is small. When the head difference H is 60 mm, the head difference H is 3 mm.
The change in the dilution concentration is smaller than in the case of 0 mm.

Here, the lower limit of the head difference H is set to 0 mm because the head difference H of the tank 46 with respect to the
This is because, if the value of becomes negative, it becomes difficult to supply a chemical solution when the flow rate of tap water is small. On the other hand, if the head difference H is too large, a problem arises that the chemical solution continues to flow even if tap water is stopped due to a siphon phenomenon. Head difference H
The upper limit of is set to 60 mm in order to prevent the siphon phenomenon by the pipe resistance. If the head difference H exceeds 60 mm, a siphon phenomenon may occur, and a special mechanism must be added to prevent the siphon phenomenon, resulting in an increase in cost.

Next, a modification of the present invention is shown in FIG. FIG.
1 denote the same members as those in FIG. A switching valve 82 is attached to the tip of the water tap 40, and the switching valve 82 is connected to the ejector 44 via a hose 84. The switching valve 82 switches between a mode in which tap water is directly discharged to the outside and a mode in which tap water is introduced into the ejector 44. Also in FIG. 6, the ejector 44 and the case 48 are in a fixed position. Accordingly, also in FIG. 6, a desired stable dilution concentration can be obtained even if the flow rate of tap water is increased by omitting the variable flow rate control valve and the check valve.

[0018]

As described above, according to the chemical liquid diluting apparatus according to the present invention, the ejector and the tank are fixed in position, and a water level holding mechanism is provided to connect the ejector and the tank.
Since the head difference is kept constant, the conventionally required flow rate variable control valve can be omitted, and even if the flow rate of tap water increases, the change in the dilution concentration of the chemical solution can be reduced. Furthermore,
By setting the head difference H to 0 mm ≦ H ≦ 60 mm, even if the flow rate of tap water increases, the change in the dilution concentration of the chemical solution can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a drug solution diluting device according to the present invention.

FIG. 2 is a sectional view showing a tank and a liquid tank used in FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2, showing a state in which a chemical is supplied from a tank to a liquid tank.

FIG. 4 is a sectional view of an ejector used in the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view showing another embodiment of the drug solution diluting device according to the present invention.

FIG. 7 is a perspective view showing a conventional chemical solution dilution device.

FIG. 8 is a sectional view of the ejector used in FIG.

FIG. 9 is a characteristic diagram showing characteristics of tap water flow rate and dilution concentration in a conventional chemical liquid diluting apparatus and the chemical liquid diluting apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 40 faucet 44 ejector 46 tank 48 case 50 water level holding mechanism 52 hose 54 opening 56 valve body 60 liquid tank 70 venturi section 72 mixing space 76 chemical communication passage 78 throttle 82 switching valve 84 hose

Continuation of the front page (56) References JP-A 1-137371 (JP, U) JP-A 56-98333 (JP, U) JP-A 61-167933 (JP, U) JP-A 37-14265 (JP) , Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01F 3 / 08,15 / 04 E03C 1/046

Claims (4)

(57) [Claims] An ejector having a passage communicating with a tap of a water supply and allowing passage of tap water supplied from the tap is provided, and a negative pressure generating section is formed in the passage of the ejector due to a change in passage cross section. The tank is connected to the negative pressure generating section via a chemical liquid introduction passage, and a negative pressure is generated in the negative pressure generating section of the ejector by the tap water supplied from the faucet. A chemical liquid diluting device that mixes tap water and a chemical liquid by introducing a chemical liquid in the tank through the chemical liquid introduction passage into the negative pressure generating section by pressure, and does not include a flow rate variable control valve in the middle of the chemical liquid introduction passage.
And fix the position of the ejector and the tank
A water level holding mechanism to maintain a constant liquid level
The liquid level holding mechanism and the liquid
Communicating with the entrance passage, and dispensing the chemical solution in the tank with the water level holding machine.
To the negative pressure generating section.
The chemical in the water level holding mechanism is passed through the chemical introduction passage to the
A chemical solution diluting device characterized by being introduced into a jector . 2. The chemical liquid diluting device according to claim 1, further comprising a throttle portion in the middle of the chemical liquid introduction passage. 3. A tap valve connected to the faucet, the tap valve being switched to discharge tap water directly to the outside or to introduce the tap water into the ejector. The drug solution dilution device according to the above. 4. A head difference between the height of the liquid surface of the tank and the height of a position where the chemical solution introduction passage communicates with the negative pressure generating portion of the ejector is defined as H. The head difference H is 0 mm ≦ H ≦ 4. The chemical liquid dilution device according to claim 1, wherein the diameter is 60 mm.