JP2006266177A - Chemical liquid dilution and mixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical liquid dilution and mixing device capable of surely bleeding air entrapped in a pipe, easily performing air bleeding operation at a short period of time without making a hand touch a chemical liquid and discharging fresh water containing the chemical liquid to the outside. <P>SOLUTION: Differences in heights are sequentially are given to a water feeding passage (151), a dilution mixing part (157) and a downstream part (172) of a liquid feeding passage (170) to put the downstream (172) at the lowest position. A flow-in port (181) of a three way cock (180) including a first flow-out port (182) and a second flow-out port (183) is connected to a pump delivery port (62), a delivery passage (65) is connected to the first flow-out port (182), and an air bleeding passage (190) connected to the bottom (24) of the fresh water tank (20) at one end thereof is connected to the second flow-out part (183) at the other end (192) thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chemical solution diluting / mixing device for diluting and mixing a chemical solution (stock solution) such as a soil disinfectant with clean water and pumping it to a chemical spraying means, etc., and in particular, easily and reliably air that has entered a pipe. The present invention relates to a chemical solution diluting and mixing apparatus that can be removed.

  In general, a chemical solution (stock solution) such as a carbam agent used for soil disinfection has strong irritation and high volatility, so that it is difficult to handle as it is, and the spraying effect is low and uneven spraying is likely to occur. Therefore, when spraying the chemical solution, it is required to dilute the chemical solution with clean water to an appropriate ratio (usually about three times).

  The inventors of the present invention have previously proposed a chemical solution diluting and mixing apparatus for diluting and mixing a chemical solution with clean water and pumping it to a chemical solution spraying means or the like as described in Patent Document 1 below. This will be briefly described below with reference to FIG.

  A chemical solution dilution and mixing apparatus 50 of the prior art example shown in FIG. 2 includes a fresh water tank 20 (capacity of about 100 L), a chemical liquid tank 30 (capacity of about 20 L), a mixing and discharging pump 60, and fresh water in the fresh water tank 20. A water supply passage 51 that leads W to a dilution mixing portion 57 made of T-shaped cheese, connected to a suction port 61 of the mixing / discharging pump 60 from an outlet 26 provided in the bottom 24 thereof, and the inside of the chemical tank 30 And a liquid supply passage 70 for guiding the chemical solution K to the dilution / mixing unit 57.

  The fresh water tank 20 has a rectangular parallelepiped shape, and is mounted and held on the box-shaped holding member 18 of the fresh water tank holding unit 15.

  On the left side of the fresh water tank holding part 15 is provided a chemical tank holding part 25 composed of a body-wound elastic pinching member 27 and the like, and the chemical tank 30 is slightly inclined to the front side of the figure in this chemical tank holding part 25. It is mounted and held detachably in a squeezed posture. The bottom 24 of the fresh water tank 20 is disposed at a position slightly higher than the bottom 34 of the chemical liquid tank 30.

  As the chemical tank 30, here, a 20L plastic tank for distributing a stock solution (soil disinfectant such as a carbam agent) is used as it is, and an air with a lid is provided on one inclined corner surface portion on the upper side thereof. An open port (not shown) is provided, and a hose attachment / detachment port 32 is provided on the other side of the upper portion, and the hose attachment / detachment port 32 is a synthetic resin that forms an upstream portion of the liquid supply passage 70. A lid plug 33 that is externally fitted and held on a transparent flexible hose 71 is detachably inserted.

  The mixed discharge pump 60 is a rotary pump that has a DC motor as a drive source (not shown) and a speed reducer and operates as a constant pressure discharge type and does not have a valve device (for example, sealless spiral pump).

  The upstream portion of the water supply passage 51 is formed by an L-shaped conduit 53, and the downstream portion thereof is a manually operated ball valve, and a flow rate adjusting valve 80 with a dilution rate setting variable position stopper mechanism 90. Chamber portion) and an elbow 54.

  On the other hand, a flow meter 75 is provided in the conduit 72 that forms the downstream portion of the liquid supply passage 70, and a window 36 is provided on the operation panel 35 in order to visually check the chemical flow rate measured by the flow meter 75. Is formed.

  In addition, a check valve and a manual valve opening member for opening and closing the chemical liquid suction port are provided at the distal end portion (upstream end portion) of the transparent flexible hose 71 made of synthetic resin that forms the upstream portion of the liquid feeding passage 70. The liquid water separation / air venting mechanism 100 is provided.

  The upstream end side of the flexible hose 71 in the liquid supply passage 70 is inserted into the chemical liquid tank 30 from the upper part (the hose attachment / detachment port 32), and the suction port (the liquid water separation / air venting mechanism). 100) is stretched to reach the bottom 34 on its lowered side.

  In the chemical solution diluting and mixing apparatus 50 having such a configuration, when the flow rate adjusting valve 80 is opened to a predetermined opening and the mixing and discharging pump 60 is driven, the chemical solution K in the chemical solution tank 30 is diluted and mixed. The portion 57 is mixed with the clean water W at a predetermined ratio and diluted, and the diluted chemical solution K ′ is further stirred and mixed in the pump 60 and then discharged through the discharge passage 65 (not shown). ) At a constant pressure and sprayed onto the soil from the spray nozzle of the chemical solution spraying means.

  Further, for example, when the chemical liquid tank 30 is emptied and air is sucked into the piping of the liquid feeding passage 70 or the like, an air venting operation is required. The plug 33 is pulled out from the hose attachment / detachment port 32, and the liquid water separation and air vent mechanism 100 provided near the upstream end of the liquid feeding passage 70 is pulled out from the chemical tank 30 together with the flexible hose 71, If the mixing / discharging pump 60 is stopped and the flow rate adjusting valve 80 is fully opened, the fresh water W enters the water supply passage 51, the dilution / mixing unit 57, the mixing / discharging pump 60, the liquid supply passage 70, and the like. It flows by water head pressure. In this state, by operating the manual valve opening member of the liquid water separating / air venting mechanism 100 having a manual valve opening member and a check valve, the check valve is forcibly opened to thereby open the liquid supply passage 70. The inside air is pushed out by the fresh water W from the check valve (suction port).

  However, in the chemical dilution mixing apparatus 50 having such a configuration, even if the air venting operation is performed as described above, the air in the pipe is not completely removed, and the air accumulates in the joint portion of the conduit forming the passage. This residual air is sucked into the mixed discharge pump 60, which may cause a problem that a suction failure occurs and a necessary discharge amount cannot be secured.

  Therefore, in order to solve the above problem, the inventors of the present invention firstly, as shown in FIG. 3 (described in Patent Document 2 below), a fresh water tank 20, a chemical liquid tank 30, and a mixed discharge tank. The pump 60, the water supply passage 151 that guides the fresh water W in the fresh water tank 20 to the dilution and mixing unit 157 connected to the suction port 61 of the mixing and discharging pump 60, and the dilution and mixing of the chemical solution K in the chemical solution tank 30. And a downstream portion 172 of the liquid supply passage 170, the dilution and mixing portion 157, and a downstream portion of the water supply passage 151 (flow rate adjusting valve 80) are arranged in a substantially straight line. A chemical solution diluting / mixing device 50 ′ that is inclined at a predetermined angle α with respect to a horizontal plane so that the downstream portion (flow rate adjusting valve 80) side of the water supply passage 151 is lowered is proposed.

In the chemical solution diluting / mixing apparatus 50 ′, during the air venting operation, the fresh water W in the fresh water tank 20 flows from the intermediate portion 151M of the water supply passage 151 located at the lowest position to the downstream portion of the flow rate adjusting valve 80 → The diluting / mixing section 157 → the conduit 172 that forms the downstream portion of the liquid feeding passage 170 is successively filled to a higher position, and the remaining air is used as a liquid / water separating and venting mechanism 100 as an air venting means. Is pushed out to the outside through a flexible hose 171 that forms an upstream portion of the liquid feeding passage 170 provided with the above. For this reason, when the air venting operation is performed, no air pool remains in the pipe, and the air in the pipe can be easily and surely vented. Since air can be easily and reliably ventilated in this way, the mixed discharge pump 60 does not cause a suction failure, and a necessary discharge amount can always be secured.
Japanese Patent Laid-Open No. 2004-187461 Specification and drawing of Japanese Patent Application No. 2003-331844

  However, the chemical solution diluting / mixing devices 50 and 50 'of the above-described prior art examples have the following problems to be improved. That is, when the air venting operation is performed as described above, it is necessary to manually open the check valve of the liquid / water separation and air vent mechanism 100 to which the chemical solution is attached. There is a problem that fresh water containing chemical liquid (residual liquid in the piping system) is discharged to the outside, and that the air venting operation is relatively complicated and takes a long time.

  The present invention has been made in view of the problems as described above. The object of the present invention is to surely remove the residual air in the pipe, and to make the air venting operation without touching the chemical with the hand. Another object of the present invention is to provide a chemical solution diluting / mixing device which can be easily and easily performed in a short time without discharging clean water containing the chemical solution to the outside.

  In order to achieve the above-mentioned object, a chemical liquid dilution mixing device according to the present invention basically includes a fresh water tank, a chemical liquid tank, a mixing and discharging pump, and fresh water in the fresh water tank at an inlet of the pump. A water supply passage that leads to the connected dilution mixing section, a liquid supply passage that guides the chemical liquid in the chemical liquid tank to the dilution mixing section, and a discharge passage that guides the diluted chemical liquid discharged from the discharge port of the pump to the chemical spraying means. .

  The water supply passage, the dilution and mixing section, and the downstream portion of the liquid supply passage are sequentially dropped so that the height position on the downstream portion side is the lowest, and the pump discharge port is An inlet of a three-way cock having a first outlet and a second outlet is connected, the discharge passage is connected to the first outlet, and one end thereof is connected to the bottom of the fresh water tank to the second outlet. The other end of the air vent passage is connected.

  In a preferred embodiment, the water supply passage, the dilution and mixing section, and the downstream portion of the liquid supply passage are arranged on a substantially straight line and inclined at a predetermined angle with respect to the horizontal plane. In this case, the predetermined angle is preferably 35 ° or less.

  In another preferred embodiment, an orifice is provided at the other end of the air vent passage or the second outlet of the three-way cock.

  The water supply passage and the air vent passage are preferably disposed below the bottom of the fresh water tank.

  In another preferred aspect, a manually operated flow rate adjusting valve is interposed in the downstream portion of the water supply passage.

  In the chemical dilution mixing apparatus according to the present invention, a three-way cock is interposed between the mixing and discharging pump and the discharge passage, and air remaining in the piping of the liquid feeding passage and the like is passed through the three-way cock to a fresh water tank. Therefore, the residual air in the piping can be surely removed, and the air venting operation can be performed without touching the hand with the chemical solution and without discharging the clean water containing the chemical solution to the outside. Can be done easily, easily and in a short time.

  Since the air can be easily and reliably ventilated in this way, the mixed discharge pump does not cause a suction failure, the necessary discharge amount can always be secured, and the air vent operation can be performed in a short time. Therefore, the pump can be put into the actual spraying work quickly and the durability of the pump can be improved.

  Further, since a preliminary pump for venting air, a liquid water separation / air venting mechanism with a check valve, and the like are not required, the structure is simplified and the cost of the apparatus can be kept low.

  The water supply passage, dilution and mixing section, and the downstream portion of the liquid supply passage are arranged at a position lower than the bottom (water surface) of the fresh water tank, because the air is vented using the head pressure of fresh water in the fresh water tank. In this case, the inclination angle (α) with respect to the horizontal plane of the downstream portion of the liquid supply passage, the dilution mixing portion, and the water supply passage arranged substantially in a straight line is relatively small (35 ° or less). As a result, it is not necessary to arrange the fresh water tank at a very high position, and the piping space in the height direction can be reduced.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a chemical solution dilution and mixing apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a chemical dilution mixing apparatus according to the present invention.

  The illustrated chemical solution diluting / mixing device 10 has substantially the same configuration as the chemical solution diluting / mixing device 50 ′ of the prior art example (described in Patent Document 2) shown in FIG. The parts corresponding to the respective parts of the chemical solution diluting / mixing apparatus 50 ′ to be used are denoted by the same reference numerals, and redundant description is omitted. In the following, differences will be mainly described.

  Similarly to the chemical dilution / mixing apparatus 50 ′ shown in FIG. 3, the chemical dilution / mixing apparatus 10 of the present embodiment also includes a fresh water tank 20 (capacity of about 100 L), a chemical liquid tank 30 (capacity of about 20 L), and a pump for mixing and discharging. 60 and fresh water W in the fresh water tank 20 are led from the outlet 26 provided in the bottom 24 to a dilution and mixing unit 157 made of T-shaped cheese connected to the suction port 61 of the mixing and discharging pump 60. A water supply passage 151, a liquid supply passage 170 that guides the chemical liquid K in the chemical liquid tank 30 to the dilution mixing unit 157, and an injection nozzle that uses the diluted chemical liquid K ′ discharged from the discharge port 62 of the pump 60 as chemical liquid spraying means. And a discharge passage 65 leading to 200.

  The mixed discharge pump 60 is a rotary pump that has a DC motor as a drive source (not shown) and a speed reducer and operates as a constant pressure discharge type and does not have a valve device (for example, sealless spiral pump).

  The upstream portion of the water supply passage 151 is formed of a transparent flexible hose 153 made of synthetic resin, and the downstream portion thereof is a manually operated ball valve having a cock lever 80b. It is formed by a flow rate adjusting valve 80 with a type stopper mechanism 90 (the valve chamber portion thereof). The upstream end 153a of the flexible hose 153 is detachably connected to the outlet 26 provided in the bottom 24 of the fresh water tank 20, and the downstream end 153b of the flexible hose 153 is connected to the flow regulating valve 80 (the joint portion thereof). ) Is detachably connected.

  On the other hand, a flowmeter 175 is provided in the rigid conduit 172 that forms the downstream portion of the liquid supply passage 170, but a transparent flexible hose made of synthetic resin that forms the upstream portion of the liquid supply passage 170 Instead of the liquid water separation / bleeding mechanism 100 with a check valve of the prior art example, a mere suction port 300 with a strainer is merely provided at the distal end portion (upstream end portion) of 171.

  The upstream end side of the flexible hose 171 in the liquid supply passage 170 is inserted into the chemical liquid tank 30 from the upper part (the hose attachment / detachment port 32), and the suction port 300 is lowered on the bottom thereof. It is stretched to reach 34.

  In the chemical dilution dilution apparatus 10 of the present embodiment, the water supply passage 151, the dilution mixing unit 157, and the downstream portion 172 of the liquid supply passage 170 are arranged below the bottom 24 of the fresh water tank 20. The water supply passage 151, the dilution / mixing unit 157, and the liquid supply passage downstream portion 172 are arranged substantially in a straight line so that the height position on the liquid supply passage downstream portion 172 side is the lowest. , And a predetermined angle α (about 25 ° in this case) with respect to the horizontal plane L.

  A three-way cock 180 is interposed between the pump discharge port 62 and the discharge passage 65. The three-way cock 180 has an inlet 181, a first outlet 182, a second outlet 183, and a cock lever 184, the inlet 181 is connected to the pump outlet 62, and the first outlet 182 The discharge passage 65 is connected to the second outlet 183, and the other end 192 of the air vent passage 190 is connected to one end 191 of the air vent 28 provided in the bottom 24 of the fresh water tank 20. ing. In the three-way cock 180, for example, when the cock lever 184 is in a right-tilt position as shown by a solid line in FIG. 1, the first outlet 182 is opened and the second outlet 183 is closed. When the cock lever 184 is in a leftward tilt position, for example, as indicated by a virtual line in FIG. 1, the first outlet 182 is closed and the second outlet 183 is opened.

  The air vent passage 190 is formed of, for example, a transparent flexible hose made of synthetic resin, and an orifice 195 (at the second outlet 183 side end (other end) 192 of the three-way cock is provided. Here, the orifice opening diameter is about 1 mm).

  On the other hand, in the discharge passage 65, a strainer 185, a flow check meter 186, and a sag prevention valve 187 are sequentially inserted from the upstream side (the three-way cock 180 side), and a chemical solution spraying means is provided at the downstream end thereof. A spray nozzle 200 is attached.

  In the chemical solution diluting / mixing apparatus 10 configured as described above, the flow rate adjusting valve 80 is opened to a predetermined opening, and the cock lever 184 of the three-way cock 180 is turned to the right-tilt position so that the first outlet 182 is opened. When the second outlet 183 is closed and the mixing / discharging pump 60 is driven in this state, the chemical solution K in the chemical solution tank 30 is mixed with the clean water W at a predetermined ratio by the dilution mixing unit 157. The diluted chemical solution K ′ is further stirred and mixed in the pump 60 and then discharged and supplied to the injection nozzle 200 through the three-way cock 180 and the discharge passage 65 at a constant pressure. The spray nozzle 200 sprays the soil.

  Further, for example, when the chemical liquid tank 30 is emptied and air is sucked into a pipe such as the liquid feeding passage 170, an air venting operation is required. The air venting operation is performed as follows. Is done.

(1) Check whether or not about half or more of the fresh water W is in the fresh water tank 20 (eg, look through a viewing window not shown). If it is not enough, add water and set the water head pressure to an appropriate value.
(2) Replacing the chemical tank 30 with a new one (filled with the chemical liquid K), and the flexible hose 171 forming the upstream portion of the liquid supply passage 170 in the new chemical tank 30 The tip (the suction port 300) is inserted.

(3) The flow rate adjusting valve 80 is fully opened, the cock lever 184 of the three-way cock 180 is turned to the left tilt position, the second outlet 183 is opened, and the first outlet 182 is closed. As a result, the fresh water W in the fresh water tank 20 flows into the water supply passage 151, the dilution mixing section 157, the mixing and discharging pump 60, the liquid supply passage 70 (excluding the upstream portion), etc. by the water head pressure. The air accumulated in the piping such as the liquid feeding passage 170 is extracted from the suction port 300 and the air vent port 28 to some extent.
(4) The pump 60 is driven and the flow rate adjusting valve 80 is fully closed. As a result, the suction force of the pump 60 acts in the piping such as the liquid supply passage 170 and the like, the fresh water W containing the chemical liquid K (residual liquid) remaining therein, the air, and the chemical liquid tank 30 The chemical solution K is sucked into the pump 60 and discharged into the fresh water tank 20 through the discharge port 62 → the second outlet 183 of the three-way cock 180 → the orifice 195 → the air vent passage 190 → the air vent port 28. Is done. In this case, since the flow of the fresh water W and the chemical liquid K is restricted by the orifice 195 provided at the end 192 of the air vent passage 190 on the three-way cock 180 side, the residual air is preferentially extracted.

(5) The air vent passage 190 or the fresh water tank formed by a transparent flexible hose made of synthetic resin means that the air in the pipe such as the liquid feed passage 170 is completely removed as described above. When it is confirmed through the 20 viewing windows, the flow rate adjusting valve 80 is fully opened and the pump 60 is operated for several tens of seconds.
(6) The pump 60 is stopped, the cock lever 184 of the three-way cock 180 is turned to the right tilt position to open the first outlet 182 and close the second outlet 183.

(7) The pump 60 is driven and the opening degree of the flow rate adjusting valve 80 is adjusted. Then, the flow meter 175 and the flow check meter 186 confirm whether each part is operating normally, whether the diluted chemical liquid K ′ is normally injected from the injection nozzle 200, and the like. Performs the operations after (3) again.
(8) Stop the pump 60 and prepare for the actual spraying operation.

  As described above, in the chemical dilution mixing apparatus 10 of the present embodiment, the three-way cock 180 is interposed between the mixing and discharging pump 60 and the discharge passage 65 and remains in the piping of the liquid supply passage 170 and the like. Since the air is drawn into the fresh water tank 20 through the three-way cock 180, the residual air in the pipe can be surely drawn, and the air venting operation can be performed without touching the chemical with the hand. Moreover, it can be performed easily and easily in a short time without discharging the fresh water containing the chemical solution to the outside.

  Since the air can be easily and reliably ventilated in this way, the mixed discharge pump 60 does not cause a problem of inhalation, can always secure a necessary discharge amount, and can perform an air vent operation. Since it can be performed reliably in a short period of time, it can be put into actual spraying work quickly and the durability of the pump can be improved.

  Further, since a preliminary pump for venting air, a liquid water separation / air venting mechanism with a check valve, and the like are not required, the structure is simplified and the cost of the apparatus can be kept low.

  It should be noted that the water supply passage 151, the dilution and mixing portion 157, and the liquid supply passage downstream portion 172 are connected to the bottom portion of the fresh water tank 20 for the purpose of venting air using the head pressure of fresh water in the fresh water tank 20. 24 (water surface), it is necessary to be disposed at a position lower than the water surface. In this case, the water supply passage 151, the dilution mixing portion 157, and the liquid supply passage downstream portion 172 disposed substantially in a straight line with respect to the horizontal plane. By making the inclination angle (α) relatively small (35 ° or less), it is not necessary to arrange the fresh water tank at a very high position, without impairing the stability of the aircraft, and in the height direction. Piping space can also be reduced.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various designs can be used without departing from the spirit of the invention described in the claims. Can be changed.

The front view which shows one Embodiment of the chemical | medical solution dilution mixing apparatus which concerns on this invention. The front view which shows an example of the conventional chemical | medical solution dilution mixing apparatus. The front view which shows the other example of the conventional chemical | medical solution dilution mixing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chemical liquid dilution mixing apparatus 20 Fresh water tank 24 Bottom part 30 Chemical liquid tank 60 Mixing discharge pump 61 Inlet 62 Discharge outlet 65 Discharge path 80 Flow rate adjusting valve (downstream part of water supply path)
151 Water supply passage 157 Dilution / mixing section 170 Liquid supply passage 172 Downstream portion 180 Three-way cock 181 Inflow port 182 First outflow port 183 Second outflow port 190 Air vent passage 191 One end portion 192 Other end portion 195 Orifice 200 Injection nozzle (chemical solution spraying means)
W Shimizu K Chemical liquid K 'Diluted chemical liquid L Horizontal plane α Inclination angle (predetermined angle)

Claims (6)

  A fresh water tank (20), a chemical liquid tank (30), a mixing and discharging pump (60), and fresh water (W) in the fresh water tank (20) are connected to an inlet (61) of the pump (60). A water supply passage (151) that leads to the dilution mixing section (157), a liquid supply passage (170) that guides the chemical liquid (K) in the chemical liquid tank (30) to the dilution mixing section (157), and the pump (60 In the chemical liquid diluting / mixing device (10), the water supply passage (151) is provided with a discharge passage (65) for guiding the diluted chemical liquid (K ′) discharged from the discharge port (62) of the liquid crystal to the chemical spraying means (200). ), And the downstream portion (172) of the diluting / mixing portion (157) and the liquid feeding passage (170) are sequentially dropped so that the height position on the downstream portion (172) side is the lowest. The pump discharge port (62) has a first An inlet (181) of a three-way cock (180) having an outlet (182) and a second outlet (183) is connected, and the discharge passage (65) is connected to the first outlet (182). The second outlet (183) is connected to the other end (192) of the air vent passage (190) whose one end (191) is connected to the bottom (24) of the fresh water tank (20). A chemical dilution and mixing device.   The water supply passage (151), the dilution and mixing section (157), and the downstream portion (172) of the liquid supply passage (170) are arranged in a substantially straight line and are predetermined with respect to the horizontal plane (L). The apparatus for diluting and mixing chemical solutions according to claim 1, wherein the apparatus is inclined at an angle (α).   The orifice (195) is provided at the other end (192) of the air vent passage (190) or the second outlet (183) of the three-way cock (180). Chemical liquid dilution mixing device.   The said water supply channel | path (151) and the said air vent channel | path (190) are distribute | arranged below from the bottom part (24) of the said fresh water tank (20), The Claim 1 characterized by the above-mentioned. Chemical solution dilution mixing device.   The said predetermined angle ((alpha)) is 35 degrees or less, The chemical | medical solution dilution mixing apparatus as described in any one of Claim 2 to 4 characterized by the above-mentioned.   The chemical solution dilution mixing apparatus according to any one of claims 1 to 5, wherein a manually operated flow rate adjustment valve (80) is interposed in a downstream portion of the water supply passageway (151).

Images