JP2002238998A - Powder dissolving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder dissolving apparatus in which powder can be preferably dissolved in a dissolving method either by first supplying or by later supplying to prepare an original liquid having a uniform concentration when preparing the original liquid by dissolving the powder in the solution. SOLUTION: The apparatus is constructed in such a manner that, when using RO water and a B agent to stir and dissolve the B agent in the RO water, the RO water pumped out of a tank main body 31 is circulated by switching between a jetting nozzle 33 and a jetting nozzle 34, and the RO water is circulated in a forward direction and a reverse direction in the vertical direction in the entire tank 31 by the stream force of the RO water alternately jetted by the nozzles 33 and 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dissolving a powder which is used, for example, when a stock solution of a dialysate used for hemodialysis is prepared by dissolving a powder as a raw material in a diluent in a tank. To a device for dissolving in water.

[0002]

2. Description of the Related Art The dialysate used for hemodialysis is Ca ²⁺ or M
The solution A is produced by diluting and mixing the solution A containing g ²⁺ and the solution B composed of sodium bicarbonate (NaHCO ₃ ) used as a buffer. idea to make, HCO ₃ in B solution ^- divalent C of a solution
combined with a ²⁺ or Mg ²⁺ to form an insoluble precipitate that CaCO ₃ and MgCO _3, Ca ²⁺ in the dialysis solution concentrate, a decrease of Mg ²⁺ ions Kitashi, Ca ²⁺ or Mg ² from patient ⁺ Is transferred to the dialysis stock solution side to cause hypocalcemia and the like.

Therefore, it is customary to obtain a dialysate by diluting and mixing solution A and solution B immediately before performing hemodialysis. Specifically, solution B is prepared to have a specific concentration. Is diluted and mixed with the solution A at a dilution ratio according to the prescription, or
A solution of sodium bicarbonate (agent B) is previously dissolved in a diluent (RO water) to a concentration according to the dilution ratio of the formulation to prepare a solution B, and the solution is diluted and mixed with the solution A to obtain a dialysate. Is prepared.

[0004] In practice, a method of preparing a dialysate using the latter agent B is often used because of the convenience of obtaining a dialysate concentration suitable for the patient's symptoms.

By the way, in the above-mentioned method of preparing a dialysate using the agent B, the solution B is prepared by dissolving the agent B with a diluting solution. First-dissolution in which the solution is supplied and stirred and dissolved, and B is stored in a tank in which a diluent is stored in advance, as described in, for example, JP-A-10-232 and JP-A-11-33109. After dissolving by stirring after supplying the agent, there is dissolving put in.

[0006] Regardless of whether the solution B is prepared by first-dissolution or the solution B by last-dissolution, the B agent collected at the bottom of the tank is hardened and solidified into a muddy state. It is assumed that the bottom diluent is locally supersaturated and has a high concentration.

Therefore, according to the descriptions in JP-A-10-232 and JP-A-11-33109,
The diluting liquid is stirred by driving a stirring rod or a blade inside the tank, or the diluting liquid extracted by a pump from the center of the tank bottom is returned to a portion near the peripheral wall at the bottom of the tank, and the diluting liquid is formed in the tank by a horizontal vortex. It has been proposed to stir.

[0008]

However, in the above-described stirring in the conventional preparation of the B liquid, the forcible stirring of the B agent which has been solidified is intensively performed at the bottom of the tank. Although the load on the drive source and drive mechanism for driving the rods and blades can be reduced, there is a locally high-saturated high-concentration region at the bottom of the tank, and the concentration of B solution is uniform throughout the tank. It cannot be sufficiently improved that it is not done.

[0009] The above problem is not limited to the preparation of the liquid B, but can also occur in the case of preparing the liquid A by dissolving with a diluent from a powder state.
This can generally occur when a powder is dissolved in a dissolving solution in a tank to prepare a stock solution.

[0010] The present invention has been made in view of the above circumstances,
An object of the present invention is, for example, when preparing a stock solution of a dialysate used for hemodialysis that purifies blood using osmotic pressure by dissolving a powder as a raw material in a diluent in a tank, and preparing a powder. Dissolving the powder in the dissolving solution to prepare an undiluted solution, a powder dissolving apparatus capable of suitably dissolving the powder in the dissolving solution and producing an undiluted solution in a uniform concentration using either the first-in-first-out method or the second dissolution method. Is to provide.

[0011]

According to a first aspect of the present invention, there is provided a powder dissolving apparatus for producing an undiluted solution by dissolving powder in a tank in a tank. It is provided at the lower part of the tank, and comprises an injection nozzle for ejecting the solution derived from the inside of the tank toward the inside of the tank, and the solution in the tank by the solution ejected from the ejection nozzle, A recirculation is generated over the entire tank, and the tank further comprises direction switching means for switching the reversal direction between forward rotation and reverse rotation.

According to a second aspect of the present invention, in the powder melting apparatus according to the first aspect, the direction switching means changes an inclination angle of the injection nozzle with respect to a horizontal plane. The apparatus has a nozzle angle changing unit.

Furthermore, a powder melting apparatus according to the present invention described in claim 3 is the powder melting apparatus according to claim 1, further comprising a plurality of the injection nozzles having different injection directions from each other, The direction switching means selects an injection nozzle for jetting the solution toward the inside of the tank from a plurality of the injection nozzles, and a selection for changing an injection nozzle selected by the injection nozzle selection means. And changing means.

According to a fourth aspect of the present invention, in the powder dissolving apparatus according to the first, second or third aspect, the injection nozzles are arranged such that the directions of the vectors in the horizontal plane are mutually different. The configuration is such that the solution is ejected simultaneously in at least two different directions.

According to the powder dissolving apparatus of the present invention, the dissolving liquid in the tank is agitated over the whole by the recirculation generated in the dissolving liquid in the tank by the dissolving liquid ejected from the injection nozzle. In addition, the solution is sufficiently stirred by the turbulence generated in the solution in the tank by switching the direction of the reflux of the solution between forward rotation and reverse rotation by the direction switching means.

Further, according to the powder melting apparatus of the present invention, the inclination angle of the injection nozzle with respect to the horizontal plane is changed by the nozzle angle changing means, so that the direction of the injection nozzle is relatively shifted toward the horizontal direction. By switching between the direction and the direction closer to the vertical direction, the direction of the reflux generated in the solution in the tank by the solution ejected from the injection nozzle is reversed.

Furthermore, according to the powder melting apparatus of the present invention, the injection nozzle selected by the injection nozzle selection means from the plurality of injection nozzles having different injection directions from each other is changed by the selection changing means. The injection direction of the solution ejected into the tank changes before and after the change by the selection change unit according to the injection nozzle selected by the injection nozzle selection unit, and the change in the injection direction Accordingly, the direction of the reflux generated in the solution in the tank is reversed.

According to the powder dissolving apparatus of the present invention, the directions in which the dissolving liquid is ejected from the injection nozzle are at least two directions having different vector directions in a horizontal plane. Therefore, the width of the reflux generated in the solution in the tank by the solution ejected from the injection nozzle is expanded at least in the horizontal direction, the flow force of the solution reflux increases, and the degree of stirring of the solution increases. Become.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a powder melting apparatus according to the present invention will be described below with reference to the drawings.

First, FIG. 1 shows a first example of the powder melting apparatus of the present invention.
FIG. 1 is a schematic configuration diagram of a dialysis powder dissolving apparatus according to an embodiment. The dialysis powder dissolution apparatus according to the first embodiment, which is indicated by reference numeral 1 in FIG. 1, is diluted and mixed with an A solution containing Ca ²⁺ or Mg ^2+. The dissolving tank 3 is used to produce the solution B constituting the dialysis fluid, and has a dissolving tank 3 and a water supply / drainage unit 5 for supplying / draining water to / from the dissolving tank 3.

The dissolving tank 3 is shown in a longitudinal sectional view of the internal structure in FIG. 2 and a tank body 31 whose bottom is squeezed in a funnel shape as shown in FIG. ), A water supply / drain port 32 formed at the center of the bottom of the tank body 31, and two ejection nozzles 3 provided at the bottom of the tank body 31 to eject liquid into the tank body 31.
3,34.

In the horizontal direction, each of the injection nozzles 33 and 34 is configured to simultaneously eject liquid toward two of the four corners of the tank body 31 that are farther from itself. In the vertical direction, the liquid is ejected horizontally or slightly downward.

The water supply / drainage unit 5 includes a tank body 31
Supply source (not shown) of RO water to be supplied to tank and tank body 3
A liquid supply pipe 51 for connecting a supply destination (not shown) of the liquid B prepared in 1; a water supply / drain pipe 52 for connecting the liquid supply pipe 51 to the water supply / drain port 32 of the tank body 31; Also, a water supply electromagnetic valve 53 provided at a position of a liquid supply pipe 51 near a water supply source (not shown), and a pump 54 provided at a position of a liquid supply pipe 51 near a drainage not shown, which is more than the supply / drainage pipe 52.
have.

The water supply / drainage unit 5 further includes a drainage electromagnetic valve 55 provided at a position of a liquid feed pipe 51 closer to the drainage (not shown) than the pump 54, and the drainage electromagnetic valve 55 and the pump 54. Between the liquid supply pipe 5
It has reflux pipes 56, 57 connecting the injection nozzles 1 and the injection nozzles 33, 34 of the dissolving tank 3, respectively, and electromagnetic valves 58, 59 for reflux provided respectively in the reflux pipes 56, 57.

In the water supply / drainage unit 5 of the first embodiment configured as described above, the drainage electromagnetic valve 55 and the recirculation electromagnetic valves 58 and 59 are both closed, and only the water supply electromagnetic valve 53 is opened. The water of the RO water from the water supply source to the tank body 31 is supplied by the power of a water supply pump (not shown) on the water supply source side, and both the water supply electromagnetic valve 53 and the return electromagnetic valves 58 and 59 are turned on. By closing and opening only the drainage electromagnetic valve 55 and operating the pump 54 in this state, the B liquid in the tank body 31 is drained to a supply destination (not shown).

In the water supply / drainage unit 5 of the first embodiment, the water supply electromagnetic valve 53, the drainage electromagnetic valve 55, and the return electromagnetic valve 59 are all closed, and only the return electromagnetic valve 58 is opened. By operating the pump 54, the liquid sucked up from the tank main body 31 is returned to the injection nozzle 33, and the electromagnetic valve 53 for water supply, the electromagnetic valve 55 for drainage, and the electromagnetic valve 58 for reflux are By closing both and opening only the reflux electromagnetic valve 59 and operating the pump 54 in this state,
The liquid sucked up from the inside of the tank body 31 is returned to the injection nozzle 34.

The above-described electromagnetic valve 53 for water supply, the electromagnetic valve 55 for drainage, and the electromagnetic valves 58 and 59 for reflux are described.
The opening and closing of the pump and the operation and stop of the pump 54 are all executed by commands from control means (not shown) such as a microcomputer.

In the powder dissolving apparatus 1 for dialysis according to the first embodiment, the return pipes 56 and 57 and the return electromagnetic valves 58 and 59 constitute an injection nozzle selecting means. The above-mentioned control means (not shown) constitutes a selection changing means in the claims.

Next, the operation (action) of the dialysis powder dissolving apparatus 1 of the first embodiment configured as described above will be described.

When the tank body 31 is filled with the liquid, the water supply electromagnetic valve 53 and the drain electromagnetic valve 5
5 and the return electromagnetic valve 59 are both closed and only the return electromagnetic valve 58 is opened. When the pump 54 is operated in this state, the liquid sucked up from the tank body 31 is returned to the injection nozzle 33. Of the four corners of the tank body 31 that are farther from itself from the injection nozzle 33
The liquid is ejected simultaneously toward the two corners.

On the other hand, when the tank body 31 is filled with liquid, the water supply electromagnetic valve 53, the drain electromagnetic valve 55, and the reflux electromagnetic valve 58 are all closed, and only the reflux electromagnetic valve 59 is operated. Open the pump 5
4 is operated, the liquid sucked up from the inside of the tank body 31 is returned to the injection nozzle 34 and
At the same time, the liquid is simultaneously ejected toward two of the four corners of the tank body 31 that are farther from the tank body 31.

Then, from the injection nozzle 33 to the tank body 3
When the liquid is ejected into the nozzle 1, as shown by the solid arrow in FIG. 2, the liquid is ejected from the ejection nozzle 33 to the bottom while passing directly above the water supply / drain port 32 and the ejection nozzle 34 by the flow force of the liquid ejected from the ejection nozzle 33. After reaching the side wall that is farther from the nozzle 33, rising along the side wall and reaching the liquid level of the liquid in the tank body 31, the opposing injection nozzle 3
The liquid in the tank main body 31 descends along the side wall closer to 3 and returns to the bottom of the tank main body 31 to reach just above the injection nozzle 33 in the forward rotation direction. Is stirred throughout.

On the other hand, from the injection nozzle 34 to the tank body 31
When the liquid is ejected into the inside, as shown by a dotted arrow in FIG.
After passing right above the water supply / drain opening 32 and the injection nozzle 33, reaches the side wall that is away from the injection nozzle 34 along the bottom, and rises along this side wall to reach the liquid level of the liquid in the tank body 31. Further, the liquid descends along the side wall closer to the opposing injection nozzle 34, returns to the bottom of the tank body 31, and reaches the position immediately above the injection nozzle 34, so that a recirculation of the liquid in the reverse direction occurs. The liquid inside is stirred throughout the vertical direction.

Therefore, when RO water is supplied into the tank body 31 in which the B agent has been previously charged and the first dissolution is performed by stirring and dissolving, the R water supplied from a water supply source (not shown) is used.
When a certain amount of O water has accumulated in the tank body 31, even if the required amount of water has not been supplied, the water supply electromagnetic valve 53
, The electromagnetic valve 55 for drainage and the electromagnetic valve 59 for reflux are not opened, and only the electromagnetic valve 58 for reflux is opened to operate the pump 54.

Then, while the supply of the RO water from the water supply source to the tank body 31 is continued, the RO water sucked up from the tank body 31 is returned to the injection nozzle 33,
In the RO water in the tank main body 31, a recirculation in the normal rotation direction indicated by a solid arrow in FIG. 2 is generated.

In this case, the B agent previously charged into the tank main body 31 does not dissolve sufficiently in the RO water supplied from the water supply source to the tank main body 31 at first, but solidifies into a muddy state and the tank main body is gradually dissolved. However, when the ejection of the RO water from the injection nozzle 33 is started, the RO water is separated from the bottom by the flow of the ejected RO water.
Furthermore, the tank body 3 rides on the vertical reflux of the RO water.
1 are distributed throughout the vertical direction.

Then, if RO water is ejected from the ejection nozzle 33 for an appropriate time length, the pump 5
While the operation of the solenoid valve 4 is in operation, the return electromagnetic valve 58 is closed and the return electromagnetic valve 59 is opened without opening the drain electromagnetic valve 55.

Then, the RO water sucked up from the inside of the tank main body 31 is returned to the injection nozzle 34, and the RO water ejected from the injection nozzle 34 has generated the RO water in the tank main body 31 until now. A flow is generated that opposes the recirculation in the normal rotation direction indicated by the solid arrow in FIG.
Turbulence is generated in the entire RO water in the tank main body 31 including the slightly flowing RO water portion near the center of the reflux, and the RO water in the tank main body 31 is stirred throughout.

When the injection of the RO water from the injection nozzle 34 continues to some extent, the reverse reflux in the reverse direction indicated by the dotted arrow in FIG.
In the same manner as the state in which the RO water is ejected from the injection nozzle 33 and generated in the O water, the B agent that has solidified in the mushroom state and stayed at the bottom of the tank body 31 is separated and the inside of the tank body 31 is removed. Dispersion in the entire vertical direction is performed.

Thereafter, depending on the degree of dissolution of the agent B in the RO water, the above-described injection of the RO water from the injection nozzle 33 into the tank main body 31 and the injection of the RO water from the injection nozzle 34 into the tank main body 31. Are repeatedly executed while being alternately switched.

The water supply electromagnetic valve 53 is closed when the required amount of RO water has been supplied into the tank body 31, and the RO water refluxed from the tank body 31 starts during the supply of RO water. May be ejected from the injection nozzle 34 instead of the injection nozzle 33 first.

On the other hand, in the case where the B agent is supplied into the tank body 31 to which the required amount of RO water has been supplied in advance and then stirred and dissolved, and then dissolution is performed, water is supplied from a water supply source (not shown). When the required amount of RO water has accumulated in the tank main body 31 by a certain amount, the water supply electromagnetic valve 53 is closed to terminate the supply of the RO water from the water supply source into the tank main body 31, and the drain electromagnetic valve 55 and the return flow After the pump 54 is operated by opening only the reflux electromagnetic valve 58 without opening any of the electromagnetic valves 59, the agent B is injected into the tank body 31.

Then, RO drawn out from the injection nozzle 33 after being sucked up from the inside of the tank body 31 and returned to the tank body 31 is returned.
The R agent introduced into the tank main body 31 rides on the reflux in the forward rotation direction indicated by the solid arrow in FIG. Distributed.

When RO water is ejected from the injection nozzle 33 for an appropriate time length, the pump 5
While the operation of the solenoid valve 4 is in operation, the return electromagnetic valve 58 is closed and the return electromagnetic valve 59 is opened without opening the drain electromagnetic valve 55.

Then, the RO water sucked up from the inside of the tank body 31 is returned to the injection nozzle 34, and the RO water ejected from the injection nozzle 34 has generated the RO water in the tank body 31 until now. A flow is generated that opposes the reversal in the reverse direction indicated by the solid arrow in FIG.
Turbulence is generated in the entire RO water in the tank main body 31 including the slightly flowing RO water portion near the center of the reflux, and the RO water in the tank main body 31 is stirred throughout.

When the injection of the RO water from the injection nozzle 34 continues to some extent, the upward and downward reflux indicated by the dotted arrow in FIG.
The B agent that has been generated in the O water and is injected into the tank main body 31 is dispersed throughout the vertical direction in the tank main body 31 in the same manner as in the state where the RO water is jetted from the injection nozzle 33.

Thereafter, depending on the degree of dissolution of the B agent into the RO water, the above-described injection of the RO water from the injection nozzle 33 into the tank main body 31 and the injection of the RO water from the injection nozzle 34 into the tank main body 31. Are repeatedly executed while being alternately switched.

It is to be noted that, after the required amount of RO water has been supplied into the tank body 31, the R
It is assumed that the O water is injected into the tank main body 31 from the injection nozzle 34 instead of the injection nozzle 33 first.

As described above, according to the powder dissolving apparatus for dialysis 1 of the first embodiment, when the RO water and the B agent are charged and the B agent is stirred and dissolved in the RO water, the RO agent is sucked up from the tank body 31. Sprayed RO water into the injection nozzle 33 and the injection nozzle 3
4 and the jetting nozzles 33 and the jetting nozzles 34 alternately spout into the tank body 31 by the flow of the RO water. It was configured to generate a recirculation in the normal rotation direction and the reverse direction.

Therefore, regardless of which of the RO water and the B agent is charged into the tank body 31, the tank body 31
Due to the recirculation of the RO water in the normal direction and the reverse direction over the entire vertical direction of the tank body 31, which alternately occurs in
The B agent can be diffused throughout the tank main body 31, and the B agent can be reliably dissolved in the RO water without staying at the bottom of the tank main body 31.

Next, a powder dissolving apparatus for dialysis according to a second embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a schematic configuration diagram of a powder dissolving apparatus for dialysis according to a second embodiment of the present invention, and reference numeral 1A in FIG.
The powder dissolving apparatus for dialysis according to the second embodiment is used for producing the liquid B, and the dispensing nozzle 34 is omitted to configure the dissolving tank 3A. Reflux pipe 57 and reflux pipe 57 connecting nozzle 34
The configuration is different from the dialysis powder dissolving apparatus 1 according to the first embodiment in that the supply / drainage unit 5A is configured by omitting the reflux electromagnetic valve 59 interposed in the apparatus.

The dialysis powder dissolving apparatus 1A according to the second embodiment is arranged outside the tank body 31 as shown in a longitudinal sectional view of the internal structure in FIG. 5 and a transverse sectional view in FIG. Tilt angle adjusting means 35 such as a stepping motor
By operating (corresponding to a nozzle angle changing means), the inclination angle of the injection nozzle 33 with respect to the horizontal plane is set to an arbitrary angle in both plus and minus directions, and the ejection direction of the liquid ejected from the ejection nozzle 33 in the vertical direction. It is configured so that it can be changed arbitrarily.

The setting of the inclination angle of the injection nozzle 33 with respect to the horizontal plane by the above-mentioned inclination angle adjusting means 35,
Electromagnetic valve 53 for water supply, electromagnetic valve 55 for drainage, and
Opening / closing of the electromagnetic valve 58 for recirculation, activation and deactivation of the pump 54 are all executed by commands from control means (not shown) such as a microcomputer.

Next, the operation (action) of the dialysis powder dissolving apparatus 1A of the second embodiment configured as described above will be described.

When the tank body 31 is filled with liquid, the water supply electromagnetic valve 53 and the drain electromagnetic valve 5
5 are closed, and only the reflux electromagnetic valve 58 is opened.
When the pump 54 is operated in this state, the tank body 31
The liquid sucked up from the inside is returned to the injection nozzle 33, and the liquid is simultaneously ejected from the injection nozzle 33 toward two of the four corners of the tank body 31 that are farther from the tank body 31.

When the injection nozzle 33 is directed horizontally or slightly downward by the inclination angle adjusting means 35, as shown by the solid arrows in FIG. Reaches the side wall away from the injection nozzle 33 along the bottom while passing just above
After rising along this side wall and reaching the liquid level of the liquid in the tank body 31, it further descends along the side wall closer to the opposing injection nozzle 33 and returns to the bottom of the tank body 31,
A recirculation of the liquid in the normal rotation direction reaches immediately above the injection nozzle 33, and the recirculation causes the liquid in the tank body 31 to be stirred over the entire vertical direction.

On the other hand, when the injection nozzle 33 is turned substantially upward by the inclination angle adjusting means 35, as shown by a dotted arrow in FIG. After rising along the side wall and reaching the liquid level of the liquid in the tank body 31, further descending along the side wall away from the opposing injection nozzle 33 and returning to the bottom of the tank body 31, A recirculation of the liquid in the reverse direction, which reaches just above the injection nozzle 33 along the bottom while passing just above the water supply / drain port 32, generates a recirculation of the liquid in the tank body 31 due to the recirculation. .

Therefore, in the case of performing first-in dissolution in which RO water is supplied into the tank body 31 in which the B agent has been previously supplied and stirred and dissolved, R water supplied from a water supply source (not shown) is used.
When the O water has accumulated in the tank body 31 to some extent, the injection nozzle 33 is directed horizontally or slightly downward by the inclination angle adjusting means 35 even if the required amount of water has not been supplied yet. 53 with the drain electromagnetic valve 55 open
, The pump 54 is operated by further opening only the reflux electromagnetic valve 58.

Then, while the supply of the RO water from the water supply source to the tank body 31 is continued, the RO water sucked up from the tank body 31 is returned to the injection nozzle 33,
In the RO water in the tank body 31, a recirculation in the normal rotation direction indicated by a solid arrow in FIG. 5 is generated.

In this case, the B agent previously charged in the tank main body 31 does not sufficiently dissolve in the RO water supplied from the water supply source to the tank main body 31 at first. However, when the ejection of the RO water from the injection nozzle 33 is started, the RO water is separated from the bottom by the flow of the ejected RO water.
Furthermore, the tank body 3 rides on the vertical reflux of the RO water.
1 are distributed throughout the vertical direction.

Then, if RO water is ejected from the injection nozzle 33 for an appropriate time length, the pump 5
While the nozzle 4 is operated, the direction of the injection nozzle 33 is changed from horizontal or slightly downward to almost upward by the inclination angle adjusting means 35.

Then, after being sucked up from the tank body 31 and returned to the injection nozzle 33, the injection nozzle 3
The RO water spouted almost upward from 3 generates a flow in the RO water in the tank body 31 that counteracts the conventional recirculation in the forward rotation direction indicated by the solid arrow in FIG.
As a result, a turbulent flow is generated in the entire RO water in the tank main body 31 including the slightly flowing RO water portion near the center of the reflux, and the RO water in the tank main body 31 is stirred throughout. Is done.

When the injection of the RO water from the injection nozzle 33 to the upper side continues to some extent, the reverse flow of the tank body 31 in the reverse direction indicated by the dotted arrow in FIG. In the same manner as the state in which the injection nozzle 33 is horizontally or slightly downwardly generated in the RO water in the inside of the tank body, the agent B is solidified into a muddy state and is separated at the bottom of the tank body 31 and the tank body is separated. Dispersion in the entire vertical direction within 31 is performed.

Thereafter, depending on the degree of dissolution of the B agent in the RO water, the above-described horizontal or slightly downward
Is repeatedly executed while alternately switching the jetting of the RO water into the tank main body 31 from the jetting nozzle 33 and the jetting of the RO water from the jet nozzle 33 substantially upward.

The water supply electromagnetic valve 53 is closed when a required amount of RO water is supplied into the tank body 31.

On the other hand, in the case where the B agent is supplied into the tank body 31 to which the required amount of RO water has been supplied in advance and then stirred and dissolved, and then dissolution is performed, water is supplied from a water supply source (not shown). When the required amount of RO water is accumulated in the tank main body 31 by a certain amount, the water supply electromagnetic valve 53 is closed to terminate the supply of the RO water from the water supply source into the tank main body 31, and the drain electromagnetic valve 55 is opened. The pump 54 is operated by opening only the recirculation electromagnetic valve 58 and the injection nozzle 33 is directed horizontally or slightly downward by the inclination angle adjusting means 35, and then the B agent is charged into the tank body 31.

Then, the RO injected from the injection nozzle 33 after being sucked up from the inside of the tank main body 31 and refluxed,
The R agent flowing into the tank body 31 in the forward rotation direction shown by the solid arrow in FIG. Distributed.

Then, if RO water is ejected from the ejection nozzle 33 for an appropriate time length, the pump 5
While the nozzle 4 is operated, the direction of the injection nozzle 33 is changed from horizontal or slightly downward to almost upward by the inclination angle adjusting means 35.

Then, after being sucked up from the tank body 31 and returned to the injection nozzle 33, the injection nozzle 3
The RO water spouted almost upward from 3 generates a flow in the RO water in the tank body 31 that counteracts the conventional recirculation in the forward rotation direction indicated by the solid arrow in FIG.
As a result, a turbulent flow is generated in the entire RO water in the tank main body 31 including the slightly flowing RO water portion near the center of the reflux, and the RO water in the tank main body 31 is stirred throughout. Is done.

When the injection of the RO water from the injection nozzle 33 to the upper side continues to some extent, the reverse flow of the reverse direction indicated by the dotted arrow in FIG. In the same manner as the state in which the RO water is generated and the injection nozzle 33 is directed horizontally or slightly downward, the B agent supplied into the tank body 31 is dispersed throughout the vertical direction inside the tank body 31.

Thereafter, depending on the degree of dissolution of the agent B in the RO water, the above-described injection nozzle 33 directed downward or slightly downward is used.
The jetting of the RO water into the tank main body 31 and the jetting of the RO water into the tank main body 31 from the jet nozzle 33 directed substantially upward are repeatedly executed while being alternately switched.

As described above, according to the powder dissolving apparatus for dialysis 1A of the second embodiment, when the RO water and the B agent are charged and the B agent is stirred and dissolved in the RO water, it is sucked up from the tank body 31. While returning the RO water to the injection nozzle 33, the direction of the injection nozzle 33 is alternately changed between horizontal or slightly downward and substantially upward, and the flow of the RO water that the injection nozzle 33 jets into the tank body 31 Thus, the configuration is such that the recirculation of the RO water in the normal rotation direction and the reverse direction is generated in the tank body 31 over the entire vertical direction.

Therefore, no matter which of the RO water and the B agent is charged into the tank body 31 first, the tank body 31
By the reversal of the forward and reverse directions of the RO water throughout the vertical direction of the tank body 31, which alternately occur in
The B agent can be diffused throughout the tank body 31 and can be reliably dissolved in the RO water without staying at the bottom of the tank body 31.

Note that the horizontal jetting direction of the RO liquid by the injection nozzle 33 or the injection nozzle 34 may be single, but as in the first and second embodiments described above,
In the horizontal direction, if the injection nozzle 33 and the injection nozzle 34 are configured so as to simultaneously spray the RO liquid toward two of the four corners of the tank body 31 that are farther from itself, the injection nozzle 33, The width of the reflux of the RO liquid generated in the tank main body 31 by the RO liquid ejected from the tank 34 is expanded at least in the horizontal direction, and the flow of the reflux of the RO liquid is increased to increase the degree of stirring of the RO liquid. This is advantageous because

By the way, in the horizontal direction, the injection nozzle 3
The direction in which the RO liquid is ejected by the nozzle 3 or the ejection nozzle 34 is not limited to two directions as in the first and second embodiments described above, but may be three or more directions.

The means for switching the direction of the return of the RO water generated in the entire tank body 31 in the vertical direction between the normal rotation direction and the reverse direction is the same as the two means in the first embodiment. The injection nozzles 33, 34, the corresponding return pipes 56, 57, and the return solenoid valves 58,
59 and the inclination angle adjusting means 35 of the injection nozzle 33 in the second embodiment.
Of course, one or both of the positions 3 and 34 may be disposed at a position other than the bottom of the tank body 31.

Further, in each of the first and second embodiments described above, the dialysis solution used for preparing the solution B constituting the dialysis solution by diluting and mixing with the solution A containing Ca ²⁺ or Mg ^2+. However, the present invention is not limited to this, and the present invention is not limited to this. For example, a powder is dissolved in a dissolving solution in a tank to prepare an undiluted solution such as dissolving the A agent to prepare the A solution. Needless to say, the present invention can be widely applied to all powder dissolving apparatuses used in such a case.

[0079]

As described above, according to the powder dissolving apparatus of the first aspect, the dissolving solution is sufficiently stirred over the entire inside of the tank so that either the powder or the dissolving solution can be used. Even if it is put in the tank first, the powder can be suitably dissolved in the dissolving liquid in the tank, and a stock solution having a uniform concentration can be produced over the entire vertical direction of the tank.

Further, according to the powder dissolving apparatus of the present invention, the inclination angle of the injection nozzle with respect to the horizontal plane is changed by the nozzle angle changing means, so that the dissolving liquid ejected from the injection nozzle is used to dispose the liquid in the tank. The direction of the reflux generated in the solution can be easily reversed.

Further, according to the powder dissolving apparatus of the present invention, the injection nozzle is selected from the plurality of injection nozzles by the injection nozzle selection means and changed by the selection changing means, whereby the powder is directed toward the inside of the tank. By changing the ejection direction of the ejected solution, it is possible to easily reverse the direction of the reflux generated in the solution in the tank by the solution ejected from the ejection nozzle.

Further, according to the powder dissolving apparatus of the present invention, the width of the reflux generated in the dissolving liquid in the tank by the dissolving liquid ejected from the injection nozzle is expanded at least in the horizontal direction, and By increasing the flow rate of the reflux and the degree of stirring of the solution by the reflux, a stock solution having a uniform concentration over the entire tank can be produced more reliably.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a dialysis powder dissolution apparatus according to a first embodiment of the powder dissolution apparatus of the present invention.

FIG. 2 is a longitudinal sectional view showing the internal structure of the melting tank of FIG.

FIG. 3 is a cross-sectional view showing the internal structure of the melting tank of FIG.

FIG. 4 is a schematic configuration diagram of a dialysis powder dissolution apparatus according to a second embodiment of the powder dissolution apparatus of the present invention.

FIG. 5 is a longitudinal sectional view showing the internal structure of the melting tank of FIG.

FIG. 6 is a cross-sectional view showing the internal structure of the melting tank of FIG.

[Explanation of symbols]

 1,1A powder dissolving device 31 tank body (tank) 33,34 injection nozzle 35 inclination angle adjusting means (nozzle angle changing means) 56,57 reflux pipe (injection nozzle selection means) 58,59 electromagnetic valve for reflux (injection nozzle selection) means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoichiro Takayanagi 1311 Aobadai, Tokorozawa-shi, Saitama Prefecture Sagimiya Manufacturing Co., Ltd. In-house (72) Inventor Takuro Ishikawa 1311 Aobadai, Tokorozawa-shi, Saitama F-term (reference) 4C077 AA05 BB01 DD17 GG09 JJ22 JJ25 KK15 4G035 AA21 AC15 AC29 AE13 AE19

Claims (4)

[Claims] 1. A powder dissolving apparatus for dissolving powder in a dissolving liquid in a tank to produce a stock solution, wherein the dissolving liquid is provided at a lower portion of the tank and ejects a dissolving liquid derived from the tank toward the inside of the tank. A jet nozzle is provided, and a solution flowing in the tank causes a recirculation of the entire solution in the tank due to the solution spouted from the jet nozzle, and the direction of the recirculation is changed between normal rotation and reversal. A powder melting device, further comprising a direction switching means for switching. 2. A powder melting apparatus according to claim 1, wherein said direction switching means has a nozzle angle changing means for changing an inclination angle of said injection nozzle with respect to a horizontal plane. 3. The apparatus according to claim 2, further comprising a plurality of injection nozzles having mutually different injection directions, wherein the direction switching means switches the injection nozzles for jetting the solution toward the inside of the tank from among the plurality of injection nozzles. 2. The powder dissolving apparatus according to claim 1, further comprising an injection nozzle selecting means for selecting, and a selection changing means for changing an injection nozzle selected by the injection nozzle selecting means. 4. The powder dissolving apparatus according to claim 1, wherein the injection nozzle is configured to simultaneously eject the dissolving liquid in at least two directions having different vector directions in a horizontal plane.