JPH10232A - Apparatus and method for powder dissolution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to easily control the density of dissolution and continuously run the apparatus by providing it with at least one powder feeder having an opening to put in specific amount of powder on the top and freely of turnable underneath and applying under it a dissolution basin to dissolve the powder. SOLUTION: When dissolving powder, a specified amount of previously measured powder then (powder for A-chemical dialysis undiluted solution) is put in several hopper(s) 1, then water in a dissolution basin 2 a little less than required amount is injected to be, agitated. The hopper 1 is turned on and it is stopped at a specified angle so that the powder inside falls into the dissolution basin 2. It is turned backward to its original position and it is again turned as far as it comes at a larger angle than before and stopped to eject the powder out. This action is repeated as much as required until all the powder falls off. The bottom face of the dissolution basin 2 is processed to a slant so that the injected powder is smoothly gathered onto the agitating space to be quickly dissoluted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a powder melting device,
For example, the present invention relates to an improvement of an apparatus for adjusting a dialysate stock solution used in an artificial dialysis apparatus and an improvement of a method of dissolving powder.

[0002]

2. Description of the Related Art Conventionally, bicarbonate dialysate used for treatment of patients with renal insufficiency, for example, in hospitals and the like, is a stock solution of agent A consisting of sodium chloride or glucose, a stock solution of agent B consisting of sodium bicarbonate or the like, and It is adjusted by quantitatively mixing three types of water. Among these, the B agent has been generally and often used in the form of powder, and is transferred to, for example, Japanese Utility Model Publication No. 6-28121 as an apparatus for automatically dissolving such powder. There has been proposed an apparatus that cuts and opens a central portion of a wrapper and pays out powder, and thereafter, weighs and conveys the powder, puts a predetermined amount into a dissolution tank, and mixes and dissolves the diluted water with the water.

Recently, attempts have been made to supply the A agent as a powder, and as a device for dissolving the powder, Japanese Patent Application Laid-Open No. Hei 7-275354 discloses a method of continuously detecting the concentration of a solution, An apparatus has been proposed in which the amount of powder supplied is controlled so as to be as follows.

[0004]

Problems to be Solved by the Invention
The apparatus described in Japanese Patent Application Laid-Open No. 8121 is designed to cut and open each of the held and conveyed bags one by one, weigh out the dispensed powder, and dissolve a predetermined amount. In addition, it requires time and effort to attach it to the bag, and when opening the bag, the bag is cut with a rotary blade and the powder is dropped into the dissolution tank provided below, so that the cutting waste of the bag is There is a possibility that the powder may be mixed in, and the powder may be scattered around, which may cause a trouble in the apparatus. Furthermore, it is difficult to accurately measure the weight of the powder due to the influence of moisture absorption or the like, and therefore, there is a disadvantage that the obtained solution concentration is likely to be inaccurate.

On the other hand, the apparatus described in Japanese Patent Application Laid-Open No. 7-275354 continuously detects the dissolved concentration and controls the powder supply amount so as to reach a predetermined concentration.
When applied to powders such as agents, there are cases in which only the main agent is dissolved and cases in which both the main agent and glucose are dissolved. It is necessary to measure the concentration of glucose and glucose individually, and to control the supply, which requires two series of devices, which is a complicated device. In addition, there is also a disadvantage that the concentration of the obtained solution is likely to be inaccurate.

[0006] Further, unlike the agent B, the above-mentioned agent A has a small change in its components even when the used amount is dissolved all at once.
In some cases, a simple dissolving apparatus for putting a predetermined amount of powder and water into a tank of about 200 L and dissolving the same is used, but the size of the apparatus is so large that an installation place becomes a problem in an urban hospital or the like. More recently, dialysis fluid quality control has tended to be further enhanced, with the dissolution equipment being washed after dialysis treatment,
It is required to prepare for the next day of dialysis. However, in the case of a large tank, it is uneconomical because both the chemical cleaning water and the post-wash water are consumed in large amounts.

The present invention has been made in view of the above-mentioned many problems, and since the powder whose powder weight is accurately measured in advance by the manufacturer is directly dissolved, the concentration of the solution can be easily controlled. It is an object of the present invention to provide a powder melting device and a powder melting method which can be continuously operated without any trouble.

Another object of the present invention is to provide a dialysis solution dissolving apparatus and a dialysis solution which can adjust the main ingredient of the above-mentioned agent A, glucose and the like to a predetermined concentration by a simple mechanism, and can continuously dissolve and supply. It is to provide a dissolution method for a liquid.

[0009]

Means for Solving the Problems The present invention has been made to achieve the above object, and the powder melting apparatus of the present invention comprises:
A powder dissolving device for dissolving powder in a liquid, having at least an opening surface for introducing a predetermined amount of powder at an upper portion, and including a driving unit for rotating the opening surface downward, at least. It is characterized by comprising one powder supply means and a dissolving tank located below the powder supply means and dissolving the powder supplied from the powder supply means.

[0010] The present invention also includes the following preferred embodiments: a. 2. The powder melting device according to claim 1, wherein an inclined portion is provided on a bottom surface of the melting tank. b. 3. The powder melting device according to claim 1, wherein a stirring means is provided on a bottom surface of the melting tank. c. 4. The powder dissolving apparatus according to any one of claims 1 to 3, wherein a means for applying a jet of the dissolving liquid is provided before the on-off valve of the discharge line of the dissolving tank. d. The powder dissolving device according to any one of claims 1 to 4, wherein the powder dissolving device is an artificial dialysate stock solution powder.

The method for dissolving a powder according to the present invention is preferably applied to the apparatus according to any one of claims 1 to 5, wherein the powder is charged into a dissolving tank to be converted into a liquid. In the dissolving method, each of at least one powder supply means is independently controlled so as to divide the powder into the dissolving tank a plurality of times, and the liquid is previously supplied to the dissolving tank. It is a method for dissolving a powder, characterized in that it is controlled so that the powder is injected while stirring and stirring.

[0012] In the present invention, according to the first aspect of the present invention, an opening surface for introducing a predetermined amount of powder is provided at an upper portion, and a driving means for rotating the opening surface downward is provided. Since at least one powder supply means and a dissolving tank which is located below the powder supply means and dissolves the powder supplied from the powder supply means are provided, the powder stored in advance is provided. If the next batch of powder is stored in the powder supply means while dissolving, immediately after dissolution is completed,
The powder can be charged and the melting operation can be continuously performed. Further, since the powder is fed by rotating the hopper, the powder can be fed reliably.

According to the second aspect of the present invention, in the first aspect of the present invention, since the inclined portion is provided on the bottom surface of the dissolving tank, the supplied powder approaches the stirring means, and the stirring effect is easily transmitted. The synergistic effect of becoming facilitates dissolution in a short time.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the stirring means is provided on the bottom surface of the dissolving tank, so that the charged powder approaches the stirring means. Dissolution in a short time is facilitated by the synergistic effect of the effect being easily transmitted.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, a means for adding a jet of a solution is provided before the on-off valve of the discharge line of the dissolving tank. By generating a backflow, undissolved powder entering the discharge line of the dissolving tank can be returned to the dissolving tank, and as a result, undissolved powder can be eliminated.

The invention described in claim 5 can be applied to dissolving the powder for artificial dialysis solution stock solution in any one of the inventions of claims 1 to 4, and a dialysis stock solution can be continuously obtained.

According to a sixth aspect of the present invention, in the method for dissolving a powder in a liquid by charging the powder into a dissolving tank, each of the at least one powder supply means includes Is independently controlled so as to be divided into a plurality of times and charged into the dissolving tank, and is controlled so that a liquid is poured into the dissolving tank in advance and the powder is charged with stirring. By adopting a system, the powder is stirred immediately after being charged, and since a large amount is not charged at once, the powder is less likely to accumulate and can be rapidly dissolved.

[0018]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow chart for explaining one embodiment of the present invention (dialysis fluid powder dissolution apparatus). FIG.
In the upper part of the apparatus, a powder supply means (hopper) which has an opening surface 1a for charging and setting the powder on the upper part and is a powder supply means for temporarily storing the powder therein.
A plurality (1 in FIG. 1) is juxtaposed. Since the hopper 1 is rotated by the rotation of the motor (external drive device) 15 and drops the powder into the dissolving tank 2 therebelow, the outer shape of the hopper 1 is smooth in a rotational direction such as a semi-cylinder. Desirably. Further, it is desirable that at least the inner wall surface of the hopper 1 be subjected to a low friction and low adhesion treatment such as a fluorine resin processing. In addition, it is also possible to employ a method in which vibration is applied to the hopper 1 to make the powder fall easily. The hopper 1 has a closed structure in which a side surface is covered with an enclosure 13 and an upper surface is covered with an opening / closing lid 14, so that foreign matter or the like is not mixed from the outside. Further, it is preferable that the hopper 1 has a structure that does not have an opening at the lower side of the hopper 1 so that the powder does not absorb and solidify under the influence of moisture from the lower melting tank 2. In addition, a filter 15 is provided on a part of the side surface of the enclosure 13 so as to exhaust the inside moisture to the outside and to prevent external foreign matter from entering.

In the present invention, when the hopper 1 is rotated and the powder is introduced into the melting tank 2, the air in the melting tank 2 may soar together with the powder. An external fixed hopper (not shown) may be used to provide a structure in which the hopper 1 of the type is further enclosed from the outside. Further, in order to prevent the powder from blowing up, a method of filling the liquid (water) to a certain level in the dissolving tank 2 before rotating the hopper 1, and further, inclining the rotating angle of the hopper 1 stepwise. A method or the like can be adopted.

The operation of the hopper 1 is based on the upper opening surface 1a.
It is preferable to return the hopper 1 to the original position every time the hopper 1 is tilted in a stepwise manner in order to prevent moisture from coming in. In addition, in order to prevent powder from absorbing moisture from above the hopper 1, A structure that includes a heater to prevent moisture absorption may be used. Further, the upper portion of the dissolving tank 2 may be sealed with an opening / closing door (not shown) to prevent moisture from entering the hopper 1.

The dissolving tank 2 located below the hopper 1
Preferably, a stirrer (stirrer) 8 is provided. Further, a storage tank 5 for temporarily storing the dissolved liquid is communicated with the liquid sending line 10 behind the dissolving tank 2, and an on-off valve 6 and an on-off valve 6 are provided between the dissolving tank 2 and the storing tank 5. A liquid sending line 10 having an injection means 7 located immediately before and a liquid sending pump 4 is arranged. The circulation line 12 is disposed between the injection means 7 and the dissolving tank 2, has the circulation liquid sending pump 3 and the electric conductivity meter 11, and is connected to the water supply line 9. In addition, a discharge line 16 is arranged below the storage tank 5, and the discharge valve 17 is opened, or a dialysate A stock solution is supplied to the artificial dialysate supply device 18 in the next step by a pump or the like (not shown). I have. Further, an artificial dialysate supply device 18 mixes the agent A stock solution, the agent B stock solution, and dilution water, and supplies the dialysate to the artificial dialyser 19.

The dissolving tank 2 of the present invention preferably has an inclined portion on its bottom surface for sliding powder. The inclined portion may be the entire bottom surface of the storage tank 5, or may be partial as shown in FIG. The inclination angle is selected depending on the type of the powder, the amount to be charged, and the like.

In the present invention, a plurality of hoppers 1 for storing powders such as powders are provided, and a single dissolving tank 2 is used in common so that necessary amounts of powders are automatically and sequentially charged to perform melting. As a result, the dissolution tank 2 and the storage tank 5 can be reduced in size as compared with the set amount of powder, and the apparatus can be made compact.

In the present invention, powders that can be preferably used include sodium chloride and powders for artificial dialysis A containing sodium chloride. The liquid is a solvent for these powders, and water is mainly used. Is done.

Next, the operation of each part will be described.

First, the opening / closing lid 14 is opened, and a predetermined amount of weighed powder (powder for dialysis stock solution A) is previously charged into the hopper 1 as powder supply means. Next, water slightly smaller than a predetermined amount is poured into the dissolving tank 2 from the water supply line 9 and then stirred by the stirring means 8. Next, the hopper 1 is rotated by the motor 15 and stopped at a fixed rotation angle, and a part of the powder is put into the melting tank 2. Further, the hopper 1 is returned to the initial position, rotated again from that state, stopped at a larger rotation angle than the previous time, and charged with powder. This operation is repeated several times as many times as necessary, and finally the entire amount of the powder is charged. The number of injections may be changed according to the amount of powder input and the solubility. In addition, when the amount of the input powder is small enough to dissolve at a time, it may be input at once. As described above, since the batch-type quantitative mixing with the liquid (water) corresponding to the amount of the powder set in the hopper is performed, there is no variation in the adjusted concentration. The amounts of the powder and the liquid can be controlled in advance by inputting data into a computer.

In the practice of the present invention, the liquid supply method is desirably divided into a plurality of steps such as two steps. The liquid volume in the first stage is adjusted slightly lower than the specified value. At this time, the control of the liquid amount may be relatively rough. After the dissolution has progressed sufficiently,
In the second stage of liquid supply, the liquid amount is adjusted to a specified value by a constant liquid amount valve. By supplying a small amount of liquid with the constant liquid amount valve, the control accuracy of the liquid level can be improved without being affected by the liquid supply pressure.

The hopper 1 of the powder supply means does not always need to be returned to the initial position every time it is charged. However, when powder which easily absorbs moisture is used, it is necessary to return to the initial position as described above. desirable.

When the powder is charged stepwise from the hopper 1, the liquid in the dissolving tank 2 is preferably kept in a stirring state, so that the solubility of the powder can be increased.
Further, the stirring method includes a method using a stirring blade or a method using a discharge pressure of a circulation pump.

The powder thus charged into the dissolving tank 2 is stirred by the stirrer 8. When the stirrer 8 including the stirring blade and the motor as shown in FIG. In order to prevent the accumulation of the powder, the stirrer 8 has to be installed in a place avoiding the powder input range. In this case, inevitably,
The stirrer 8 is disposed at the end of the dissolving tank 2, but the powder introduced into a place distant from the stirrer 8 will be insufficiently stirred, requiring a great deal of time for dissolution, which is not suitable for practical use. It can happen. In this embodiment, the dissolving tank 2
An inclined portion as shown in FIG. 1 is provided on the bottom surface of the container, so that the charged powder easily gathers in the stirring section, so that the charged powder slides on the inclined portion and approaches the stirrer 8 and the dissolving tank 2 The stirring effect is improved by the synergistic effect of reducing the dead space of the powder, and the powder is rapidly dissolved.

FIG. 2 is a sectional view showing a second embodiment of the stirring means of the present invention. As shown in FIG.
When a stirring blade or a stirring nozzle is arranged as the stirring means 8 on the bottom surface of the above, since the stirring means 8 can be installed within the range of charging the powder, a sufficient stirring effect can be exhibited.

The rotation of the stirring blade is controlled by the liquid amount (liquid level). When the liquid level is low, the rotation speed can be reduced to prevent the liquid from jumping and swirling.

In the present invention, a circulation pump can be provided in the dissolving tank 2 to provide a stirring function. When dissolving the powder, the dissolution of the powder can be improved by providing or directing the pump discharge port to a portion of the melting tank 2 that is likely to be a dead space. For example, dissolution tank 2
Since the pipe connecting portion protruding from the bottom of the pipe tends to become a powder pool, connecting the pipe from the discharge port allows the powder to be sprayed to the pool and to be blown up and circulated from the lower portion, which is efficient.

After the dissolution of the powder is substantially completed, the circulating liquid sending pump 3 is operated, and the injection nozzle 7 located immediately before the on-off valve 6 in the liquid sending line 10 through the circulating line 12.
The lysate is sent from. By this operation, as shown in FIG. 3, after the powder is charged, undissolved powder that has entered the liquid sending line 10 from the outlet at the bottom of the dissolving tank 2 is pushed back into the dissolving tank 2 and stirred. As a result, the undissolved powder is also dissolved.

After the dissolution is almost completed, the stirrer 8 is stopped, water is injected from the water supply line 9 to the final reaching liquid level, and the stirrer 8 is operated again to continue stirring and dissolving. After a certain period of time, the concentration is checked by the conductivity meter 11, and if there is no problem, the agitator 8 and the circulating pump 3 are stopped. After confirming the signal of the liquid sending OK in the storage tank 5, the on-off valve 6 is opened, the liquid sending pump 4 is operated, and the liquid is sent from the liquid sending line 10 to the storage tank 5. After the completion of the liquid feeding and the sensor confirming that the dissolution tank 2 is empty, the next dissolution step is started. By repeating the above steps, continuous dissolution is performed.

Further, a thermometer is provided in each of the dissolving tank 2 and the storage tank 5, so that the adjustment state of the dissolving solution can be constantly checked.

In the present invention, when the powder is set in the hopper 1, falling dust can be prevented from entering the hopper 1 by attaching an exterior plate to the entire melting apparatus. Further, an automatic chemical liquid (cleaning liquid) injecting unit (not shown) is provided in the dissolving apparatus, so that each tank and piping can be automatically cleaned with a chemical liquid or water. Further, when the supply water from the water absorption tank overlaps with the use of another device and the amount cannot be sufficiently confirmed, the washing operation can be performed by the self-timer so as not to overlap with the operation time zone of the other device. .

The powder dissolving apparatus of the present invention is used for dissolving salt and the like, and is particularly suitably used for dissolving a powder for an artificial dialysate stock solution.

[0039]

According to the present invention, the following effects can be obtained. First, in the powder melting apparatus according to the first aspect, at least one of the first and second powder dispensers includes an opening surface for introducing a predetermined amount of powder at an upper portion, and a driving unit for rotating the opening surface downward.
Since there is provided a powder supply means for the table and a dissolving tank which is located below the powder supply means and dissolves the powder supplied from the powder supply means, the powder stored in advance is dissolved. If the powder of the next batch is stored in the powder supply means while it is in operation, the next powder can be charged immediately after the previous melting is completed, and the melting operation can be performed continuously. .

In the present invention, since the dissolution can be performed continuously as described above, the amount of one dissolution can be reduced, and the whole apparatus can be made compact, so that there is an advantage that the installation place can be reduced. In addition, since the powder is introduced into the melting tank by rotating the powder supply means (hopper), the powder can be reliably introduced. Since it is not used, it is possible to prevent the trouble of the apparatus due to the powder in advance. Furthermore, it is a simple mechanism that stores accurately weighed powder directly from the bag into the powder supply means, puts it in the dissolution tank as it is, and dissolves it with a predetermined amount of water. Few. As a result, a solution having a small concentration variation can be obtained.

In the powder dissolving apparatus according to the second aspect, since the bottom of the dissolving tank has an inclined portion, the charged powder approaches the stirring means and the stirring effect is easily transmitted. The synergistic effect allows for dissolution in a short time.

In the powder melting apparatus according to the third aspect, the stirring means is provided on the bottom surface of the melting tank, so that the supplied powder approaches the stirring means and the stirring effect is easily transmitted. The synergistic effect allows for a shorter dissolution.

According to the fourth aspect of the present invention, there is provided a means for applying a jet flow of the dissolving liquid in front of the on-off valve of the discharge line of the dissolving tank, and a reverse flow is generated in the drain line, so that the dissolving tank is provided. The undissolved powder entering the discharge line can be returned to the melting tank, and as a result, the undissolved powder can be eliminated.

In the apparatus for dissolving powder according to the fifth aspect, by applying this to the dissolution of powder for artificial dialysis solution stock solution, a dialysis stock solution can be continuously obtained.

According to the method for dissolving powder according to claim 6,
With the system in which the rotating input means is controlled so as to divide the powder into a plurality of times, and is further controlled so that the powder is poured into the dissolving means after the water has been stirred, the powder is dissolved in the melting tank. The powder can be quickly dissolved without accumulating in the inside.

[Brief description of the drawings]

FIG. 1 is a flow chart for explaining one embodiment of the present invention (dialysis fluid powder dissolution apparatus).

FIG. 2 is a sectional view showing a second embodiment of the stirring means of the present invention.

FIG. 3 is an operation explanatory view of the injection means of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Powder supply means (hopper) 1a ... Opening surface 2 ... Dissolution tank 3 ... Circulating liquid sending pump 4 ... Liquid sending pump 5 ... Storage tank 6 ... On-off valve 7 ... Injecting means (injecting nozzle) 8 ... Stirring means (stirring machine) 9 ... Water supply line 10 ... Liquid sending line 11 ... Conductivity meter 12 ... Circulation line 13 ... Enclosure 14 ... Open / Close Cover 15 ··· filter 16 ··· discharge line 17 ··· discharge valve 18 ··· artificial dialysis fluid supply device 19 ··· artificial dialysis device

Claims (7)

[Claims] 1. A powder dissolving device for dissolving powder in a liquid, comprising: an opening surface for introducing a predetermined amount of powder at an upper portion; and a driving device for rotating the opening surface downward. At least one powder supply means provided with a means, and a dissolving tank which is located below the powder supply means and dissolves the powder supplied from the powder supply means. Powder melting equipment. 2. The powder melting apparatus according to claim 1, wherein an inclined portion is provided on a bottom surface of the melting tank. 3. The powder dissolving apparatus according to claim 1, wherein a stirring means for the dissolving tank is provided. 4. The apparatus for dissolving powder according to claim 1, further comprising means for injecting a jet of the dissolving liquid before the on-off valve of the discharge line of the dissolving tank. 5. The powder dissolving apparatus according to claim 1, wherein the powder is a powder for an artificial dialysate stock solution. 6. A method of charging a powder into a dissolving tank and dissolving it with a liquid, wherein each of at least one powder supply unit divides the powder into the dissolving tank a plurality of times. A method of dissolving the powder, wherein the method is controlled so that the liquid is previously poured into the dissolving tank and the powder is charged with stirring. 7. The method for dissolving powder according to claim 6, wherein the apparatus for dissolving powder according to any one of claims 1 to 5 is used.