JPH079435B2 - Liquid distributor - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a liquid distribution device, for example, a device used for a reaction tube cleaning device for cleaning the inside of a reaction tube after completion of analytical measurement in an automatic chemical analysis device. Is.

[Technical background of the invention and its problems]

In the automatic chemical analyzer, the reaction tubes after the analysis and measurement are sequentially washed in the reaction tube washing section, and are removed so that the reaction solution used previously does not affect the subsequent measurement. A conventional reaction tube cleaning device will be described with reference to FIG. 3. The reaction tube 1 containing the reaction solution for which measurement has been completed moves intermittently and sequentially along a drive system path (not shown). When it reaches below the cleaning nozzle 2, the cleaning nozzle 2 descends and is inserted into the reaction tube 1. The cleaning nozzle 2 has a suction nozzle 3 having a suction port 3a at the lower end and a discharge port 3b at the upper end, and a discharge port 4a formed by inserting a plurality of the suction nozzle 3 and discharging the cleaning water at the lower end. This outlet at the top
And a discharge nozzle 4 having a cleaning water supply port 4b for supplying cleaning water to 4a. Then, the wash water of the water source 5 is supplied to the branch pipe 7 via the conduit 6, and is supplied to each reciprocating pump 9 through a large number of pipes 8 connected to the branch pipe 7. Then, the plunger 9a of the reciprocating pump 9 is pushed to supply the cleaning water into the discharge nozzle 4 through the three-way valve 9b and the cleaning water supply port 4b, and further discharge into the reaction tube 1 through the discharge port 4a. The inner wall of the reaction tube 1 is washed according to the discharge pressure. Further, the vacuum pump 10 operates at the same time as the operation of the reciprocating pump 9, and the reaction liquid in the reaction tube 1 and the cleaning water discharged from the discharge port 4a are sucked into the suction nozzle 3 through the suction port 3a, Further, the inside of the reaction tube 1 is cleaned by discharging from the discharge port 3b.

[Problems of background technology]

By the way, the washing water of the water source 5 is provided with the conduit 6, the branch pipe 7, and the pipe 8.
And is supplied to the cleaning nozzle 2 via the reciprocating pump 9, but when the cleaning water is supplied to the cleaning nozzle 2 once and the plunger 9a has finished descending for the next supply, the flowing water flowing through the conduit 6 Due to the large amount, the wash water is also pushed out to the discharge side of the three-way valve 9b due to inertia, and this wash water drops from the tip of the wash nozzle 2 like drops, and the wash water has already been washed and all wash water is removed. The discharged reaction tube 1 sometimes entered. In order to prevent this, it has been proposed to reduce the amount of water flowing through the conduit 6, slow the speed, or use a solenoid valve. In these methods, however, the supply of washing water is increased accordingly. Takes a long time, and there is a problem that the cleaning processing time of a large number of reaction tubes is delayed and the efficiency is reduced.
Further, the structure using the solenoid valve has a complicated structure, and there is a problem that the price becomes high.

[Object of the Invention]

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a liquid distribution device that softens the inertia of a liquid and prevents the cleaning water from being discharged from the tip of a cleaning nozzle when unnecessary. To provide.

[Outline of Invention]

In order to achieve the above object, a liquid distribution apparatus according to the present invention is an apparatus including a distribution unit that distributes a liquid from a liquid storage unit into a reaction tube connected to a plurality of nozzles via a conduit, wherein the conduit of An air pocket is formed in a part of the liquid flow path.

Example of Invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment in which the liquid distributor of the present invention is applied to a reaction tube cleaning device, and those having the same functions as those of the conventional example shown in FIG. Detailed description is omitted.

In the figure, the conduit 6 is connected to a branch pipe 7 serving as a distributor through a connecting pipe 11 having a diameter larger than that of the conduit 6. This connecting pipe
An air chamber 12 communicates with an upper portion of the air chamber 11. A cleaning water 13 is supplied to the air chamber 12, and an air pool 14 is formed above the cleaning water 13.

In the device of the present invention configured as described above, the washing water is supplied from the water source 5 serving as the liquid storage portion through the conduit 6 and the connecting pipe 11 to the branch pipe
The cleaning water is supplied from the branch pipe 7 into the reciprocating pump 9 through the pipes 8 when the plunger 9a of the reciprocating pump 9 descends. At this time, many pipes 8
Since the wash water is supplied to the branch pipe 7, the wash water always flows into the branch pipe 7 at a considerable speed, but since the air pool 14 is formed in the middle of the conduit 6, the air pool 14 serves as a damper. To properly absorb the flow energy of the wash water,
Soften the inertia of the fluid. Therefore, when the cleaning water is supplied from the branch pipe 7 to the reciprocating pump 9 through the pipe 8, the inertia energy is weakened, and when the plunger 9a is lowered, the inertia of the fluid cleans the discharge side of the three-way valve 9b. Water can be prevented from entering. For this reason, the wash water does not enter the wash nozzle 2 except when the wash water is normally supplied to the wash nozzle 2, so that the wash water can be prevented from dripping from the wash nozzle 2 when not needed.

Although one embodiment of the present invention has been described above in detail, modifications can be made within the scope of the present invention.

For example, as shown in FIG. 2, a conduit 15 for supplying washing water from the water source 6 to the branch pipe 7 is larger in diameter than the normal conduit 6, and the conduit 15 is positioned higher than the branch pipe 7. The air pocket 17 can be formed in the mountain portion 16 by bending the mountain portion 16 so as to form the mountain portion 16. When the conduit 15 having such a large diameter is used, the flow rate of the washing water can be reduced,
Moreover, the flow velocity energy can be weakened by the air reservoir 17.

The air reservoirs 14 and 17 in each embodiment are preferably formed as close to the branch pipe as possible.

〔The invention's effect〕

As described above in detail, according to the present invention, by forming an air pocket in a part of the liquid flow path of the conduit for supplying the liquid to the distribution section, this air pool exerts a damper effect, and Since the inertial energy of the flowing liquid is weakened and the inertia of the liquid is softened, it is possible to provide a liquid distribution device that prevents the liquid from being discharged from the tip of the nozzle when it is not needed.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention, FIG. 2 is a schematic explanatory view showing another embodiment, and FIG. 3 is a schematic explanatory view showing a conventional example. 1 ... Reaction tube, 2 ... Nozzle, 5 ... Liquid storage section, 6 ...
… Conduit, 7 …… Distributor, 8 …… Piping, 9 …… Reciprocating pump, 9b …… Three-way valve, 11 …… Connecting pipe, 12 …… Air chamber, 14…
… Air trap.

Claims (1)

[Claims] 1. An apparatus comprising a distributor for distributing a liquid from a liquid container into a reaction tube connected to a plurality of nozzles via a conduit, wherein an air reservoir is provided in a part of the conduit in the liquid flow path. A liquid dispensing device, wherein the liquid dispensing device comprises: