JPH11290621A - Circulating warm bath device and control of dc pump of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling a DC pump equipped with slow starting processing of a pump in which outflow of a filter medium in a filter tank is decreased at time for starting backward washing of the filter tank in a circulating warm bath device equipped with a function to backward washing the inside of the filter tank. SOLUTION: A microcomputer 101 forms pump controlling data and transfers it to a D/A transducer 102. The D/A transducer 102 outputs modulated wave corresponding to the transferred data, and PWM waveform is formed in comparison with both modulated wave and a triangular wave of a triangular wave oscillating circuit 103a of a three-phase invertor 103. Speed change of a three- phase DC brushless motor 105 is enabled by performing PWM-control for a driving circuit 104 as the final circuit. Slow starting processing of the pump is enabled at time for starting backward washing of a filter tank by gradually changing pump-controlling data at a constant interval through the microcomputer 101 and transferring the changed pump-controlling data to the D/A transducer 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating warm water bath having a function of back-washing the inside of a filtration tank and a method for controlling a DC pump of the circulating warm water bath.

[0002]

2. Description of the Related Art In recent years, a circulating warm water bath having a function of washing the inside of a filtration tank by switching a circulation path of water has come to be used in baths of ordinary households.

A conventional circulating hot water bath of this type is configured using two switching valves (three-way valves) as shown in a block diagram of a water circulating path of the conventional circulating hot water bath in FIG. In FIG. 7, reference numeral 501 denotes a DC pump for feeding water into a circulation path;
2 is a filtration tank for filtering water flowing through the circulation path, 503a.
A switching valve 503b switches the circulation path. The filtration tank 502 has a structure in which the lower part of the filtration tank 502 is tapered and the upper part is opened as shown in the schematic view of the filtration tank of the conventional circulating warm water bath in FIG. A water inlet pipe 603 is connected to the open end 602 at the top of the tank 502, and a filter medium 60 made of activated carbon, glass beads, ceramic balls, alumina sand, or the like is provided in the filter tank 502.
4 and the connecting portion 6 between the filtration tank 502 and the water discharge pipe 601.
05 has a structure in which a net is arranged so that the filtering material 604 does not flow out.

At the time of filtration circulation, the water suction port → DC pump 50
1 → switching valve 503a → filtration tank 502 → switching valve 503b →
Water circulates along the filtration circulation path A at the water outlet, and when the filter tank is backwashed, the water inlet → DC pump 501 → switch valve 503.
b → the filtration tank 502 → the switching valve 503a → the water circulates along the filtration tank back washing path B at the drain port. At the time of filtration circulation, circulating water enters the filtration tank 502 from the water inlet pipe 603 and the filter medium 604.
Through the water pipe 601. Conversely, at the time of reverse washing of the filtration tank, the circulating water enters the filtration tank 502 from the outflow pipe 601, passes through the filtering material 604, and exits through the inflow pipe 603.

[0005] In the filtration tank reverse washing path B, the circulating water is drained after passing through the filtration tank 502 in the opposite direction to the filtration circulation path A, so that a stable laminar flow is formed in the filtration tank 502 and the filter medium 6 is removed.
04 can be circulated and floated to clean dirt attached to the surface.

[0006]

However, in the conventional circulating warm water bath, when the DC pump is started at the time of starting the backwashing of the filtration tank, water is strongly discharged from the water discharge pipe 601 to the filtration tank 50.
2, an unsteady vortex is generated by the shock wave-like water flow, and the unsteady vortex causes the filtering material 604 to flow, and the filtering material 604 to flow out of the water inlet pipe 603. .

[0007] The circulating warm bath of the present invention solves the above-mentioned conventional problems. By providing a DC pump slow start means for gradually increasing the DC pump output at the start of backwashing of the filter tank, an unsteady vortex is generated. To prevent it from occurring
An object of the present invention is to provide a circulating warm bath in which outflow of a filtering material is prevented.

The DC pump control method for a circulating warm water bath according to the present invention solves the above-mentioned conventional problem, and performs a DC pump slow start procedure for gradually increasing the DC pump output at the start of backwashing of a filtration tank. An object of the present invention is to provide a method of controlling a DC pump of a circulating warm bath, which suppresses generation of a steady vortex and prevents outflow of a filtering material.

[0009]

In order to solve the above-mentioned problems, a circulating warm water bath according to the present invention includes a DC pump for producing a circulating water flow, and a filtration tank filled with a filtering material, and switches the circulating water flow in the reverse direction. This is a circulating warm water bath for washing the filter medium, which comprises a pump slow start means for gradually increasing the amount of circulating water flow at the start of the filter medium washing.

With this configuration, it is possible to provide a circulating bath in which unsteady vortex generated at the start of backwashing of the filter tank is suppressed and the outflow of the filter material is prevented.

Further, the DC pump control method for a circulating warm water bath according to the present invention comprises a DC pump for producing a circulating water flow, and a filtration tank filled with a filtration material, and washing the filtration material by switching the circulating water flow in the opposite direction. And a pump slow start procedure for gradually increasing the amount of circulating water flow at the start of washing of the filter medium.

With this configuration, it is possible to provide a method of controlling the DC pump of the circulating warm bath in which the unsteady vortex generated at the start of the backwashing of the filter tank is suppressed and the outflow of the filter medium is prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The circulating water bath according to the first aspect of the present invention comprises a DC pump for producing a circulating water flow, and a filtration tank filled with a filtering material, and the circulating water flow is switched by switching the circulating water flow in a reverse direction. A circulating warm water bath for washing the filter material, which is provided with a DC pump slow start means for gradually increasing the amount of circulating water flow at the start of the filter material washing. It has the effect that the unsteady vortex generated at the start is suppressed and the outflow of the filter medium is prevented.

[0014] The circulating warm bath according to claim 2 of the present invention comprises:
The circulating warm water bath according to claim 1, further comprising a microcomputer for performing DC pump slow start means, wherein the DC pump slow start means is set by a program for controlling the microcomputer. It has the action of:

[0015] The circulating warm water bath according to claim 3 of the present invention comprises:
The circulating warm water bath according to any one of claims 1 and 2, wherein in the DC pump slow start means, the amount of the circulating water flow at the start of washing the filter medium and the final amount at the time of washing the filter medium are determined. The final flow rate of the circulating water flow to be reached, and the number of steps and time from the start of cleaning of the filter medium to the final flow rate can be set from the outside. Of the circulating water flow, the final flow rate of the circulating water flow that finally reaches at the time of washing the filter medium, and the number of steps and time from the start of washing the filter medium to the final flow rate can be freely changed. It has the action of:

[0016] The D of the circulating warm bath according to claim 4 of the present invention.
The C pump control method includes a DC pump for creating a circulating water flow, a filtration tank filled with a filtering medium, and a circulating warm bath D for cleaning the filtering medium by switching the circulating water flow in the opposite direction.
A C-pump control method, comprising a DC pump slow-start procedure for gradually increasing the amount of circulating water flow at the start of washing the filter medium.
It has an effect that an unsteady vortex generated at the start of the backwashing of the filtration tank is suppressed and the outflow of the filtering material is prevented.

(Embodiment 1) FIG. 1 is a device block diagram of a DC pump control unit of a circulating warm water bath according to Embodiment 1 of the present invention.

In FIG. 1, 101 is a microcomputer storing a DC pump control program, and 102 is a microcomputer 10
A D / A converter 103 that outputs an analog voltage waveform (modulated wave) 2 corresponding to the DC pump control data from 1;
Based on the modulated wave 2, the triangular wave oscillation circuit 103a and the comparator 103
b, a three-phase inverter generating a PWM waveform 3
Reference numeral 4 denotes a final-stage drive circuit for amplifying the PWM waveform 3 and driving the three-phase DC brushless motor 105. According to this configuration, the DC data is controlled by the control data from the microcomputer.
It is possible to finely control from the pump stop state to the DC pump maximum output state, and this DC pump control unit realizes a DC pump slow start means.

Next, a DC pump control method in the control section of the DC pump configured as described above will be described with reference to the drawings.

FIG. 2 shows a circulating warm water bath D according to the first embodiment.
FIG. 3 is a flowchart of a C pump control method, FIG. 3 is a flowchart of a DC pump output setting process (A) of the circulating warm bath according to the first embodiment, and FIG. 4 is a DC pump output setting process of the circulating warm bath according to the first embodiment ( It is a flowchart of B).

In FIG. 2, when the circulating warm bath is switched on, the state of the DC pump is set to the initial state (S2).
00). At this time, the DC pump state, DC pump current state, DC pump previous state, data transfer operation state, and slow start state are each set to the initial state.

The DC pump state refers to the operating state of the DC pump (for example, "strong state", "weak state", "backwash state"
Etc.) and stored in the memory of the microcomputer. The DC pump current state and the DC pump last state represent the current DC pump state and the past DC pump state, respectively.
It is stored in the memory of the microcomputer. The operation state of the data transfer indicates permission / non-permission of the data transfer from the microcomputer to the D / A converter, and is stored in the memory of the microcomputer. The slow start state indicates permission / non-permission of the execution of the slow start procedure, and is stored in the memory of the microcomputer.

In the initial state, the DC pump current state and D
The previous state of the C pump is set to the initial state of the DC pump state, the operation state of data transfer is set to the data transfer disabled state, and the slow start state is set to the slow start disabled state.

Next, the current state of the DC pump is stored in the memory as the DC pump current state (S201).

Next, a DC pump output setting process is performed (S
202). Although the details of the DC pump output setting process will be described later, here,
Based on the current state of the DC pump, the previous state of the DC pump, the slow start state, the previous state of the DC pump, the operation state of data transfer, the slow start state, and the DC pump control data are set. Here, the DC pump control data is DC
This is data sent from the microcomputer to the D / A converter to control the operation of the pump.

Next, it is checked whether the data transfer operation state is the data transfer permission state or the data transfer non-permission state (S203).

In S203, if the operation state of the data transfer is the data transfer permission state, the DC pump control data is transferred from the microcomputer to the D / A converter (S20).
4), the operation state of the data transfer is set to the data transfer non-permission state (S205).

When the above procedure is completed, S201 to S201 are performed again.
The procedure of S205 is repeated. This repetitive processing is continued until an end instruction by the interrupt processing is received.

Next, the DC pump output setting process will be described.
This will be described in detail with reference to FIG.

In the DC pump output setting process, first, it is determined whether the slow start state is the slow start permission state or the slow start non-permission state (S30).
1).

If the slow start is not permitted in S301, it is checked whether the current state of the DC pump is equal to or different from the previous state of the DC pump (S30).
2).

In S302, if the current state of the DC pump is different from the previous state of the DC pump, it is determined that the DC pump state has been switched. If the current state of the DC pump is other than the "backwashing state", the current state of the DC pump is determined. The DC pump control data corresponding to the state is set, the data transfer operation state is set to the data transfer permission state (S303a), and the DC pump current state is stored in the memory of the microcomputer as the DC pump previous state (S304a). If the DC pump current state is the “backwashing state”, the slow start state is set to the slow start permission state, and the slow start stage is set to the first step (S303b).
The C pump last state is stored in the memory of the microcomputer (S304b).

If it is determined in step S301 that the slow start is permitted, first, the slow start is performed in the first state.
It is confirmed whether or not it is a step (S305).

In step S305, if the slow start stage is the first step, the DC pump control data of the first step is set, the data transfer operation state is set to the data transfer enabled state, and the slow start step is set to the second step. The timer is reset (S306). Here, as the timer, a timer built in the microcomputer may be used, or a timer variable may be stored in the memory of the microcomputer, and S201 may be used.
It is also possible to increment the number of times each time Steps S205 to S205 are repeated and wait until the value reaches a certain value.

In S305, if the slow start stage is the k-th step (k> 1), it is checked whether or not the timer has elapsed for a predetermined time (S307). The DC pump control data of the step is set, the data transfer operation state is set to the data transfer permission state, the slow start step is set to the (k + 1) th step, and the timer is reset (S308). If the (k + 1) th step is the final step, S309), the slow start state is set to the slow start disallowed state (S31).
0).

According to the above procedure, the DC pump slow start procedure can be performed. More specifically, an operation example in each step of the slow start stage at the start of the backwashing operation is described in Embodiment 1 of FIG. 6 illustrates an example of DC pump control data in the DC pump slow start procedure according to the first embodiment, and FIG. 6 illustrates serial transfer data in the DC pump slow start procedure according to the first embodiment.

For convenience, the circulation flow rate circulating in the filtration tank circulation path or the filtration tank reverse circulation path is represented by 20 stages of 0 L to 19 L. 0L indicates no water flow and 19L indicates D
Indicates the flow rate at the end of the C pump slow start procedure. In addition, the flow speed is set to be equal every 1 L from 0 L to 19 L. Further, the DC pump control data is represented by hexadecimal numbers 0H to CAH, and the DC pump control data 0H is
It is assumed that the DC pump control data CAH corresponds to the circulation flow rate of 19L.

When the slow start state becomes the permitted state,
First, in the first step, the DC pump control data 58 corresponding to the circulation flow rate 6 L at the start of the DC pump slow start procedure is set.
H is set, the operation state of the data transfer is set to the data transfer permission state, and the state shifts to the state of the second step (S306), the DC pump control data 58H is transferred to the D / A converter (S204), and the data transfer is performed. Is set to the data transfer non-permission state (S205).

After the second step, 120
The state of the step is maintained until the millisecond elapses (S30).
7) After 120 milliseconds elapse, the DC pump control data of the step is set, the data transfer operation state is set to the data transfer permission state, and the state moves to the next step (S30).
8) The DC pump control data 58H is transferred to the D / A converter (S204), and the data transfer operation state is set to the data transfer non-permission state (S205).

As described above, the DC pump control data is stored in the first
It is changed stepwise from 58H in the step. In a fortieth step, the DC pump control data CAH corresponding to the circulation flow rate 19L at the end of the DC pump slow start procedure is set, and the operation state of the data transfer is set to the data transfer permission state,
The state shifts to the state of the forty-first step (S308), and the slow start state is set to the slow start disallowed state (S308).
310). The DC pump control data CAH set in the fortieth step is transferred to the D / A converter in S204, and the DC pump slow start procedure ends. Therefore, the DC pump slow start procedure is performed over a total time of 120 ms × 40 steps = 4.8 seconds.

By the above control, the generation of the unsteady vortex in the filter tank due to the shock wave-like backflow at the start of the backwashing operation is suppressed, and the floating and rising of the filter medium due to the unsteady vortex are caused.
Outflow can be reduced.

In the DC pump slow start procedure, the amount of the circulating water flow at the start of the washing of the filter medium, the final flow rate of the circulating water flow reached in the final step of the washing of the filter medium, The number of steps and time required to reach the flow rate may be configured to be set from the outside.

Thus, the amount of the circulating water flow at the start of the cleaning of the filter medium, the final flow rate of the circulating water flow that finally reaches at the time of cleaning the filter medium, and the time from the start of the cleaning of the filter medium to the final flow rate The number of steps and time can be freely changed, and the set amounts can be actually operated and set to optimal values according to the shape of the filter tank, the specific gravity of the filter medium, and the amount of circulating water. .

[0044]

According to the first aspect of the present invention, the circulating warm bath includes a DC pump for producing a circulating water flow, and a filtration tank filled with a filtering material, and the circulating water flow is switched in the opposite direction to change the circulating water flow. A circulating warm water bath for washing, comprising a DC pump slow start means for gradually increasing the amount of circulating water flow at the start of washing of the filter medium, the unsteady vortex generated at the start of backwashing of the filter tank is reduced. The effect of suppressing the outflow of the filter medium and preventing the filter medium from being reduced due to the decrease in the filter medium in the filter tank is obtained.

The circulating warm bath according to claim 2 of the present invention comprises:
The circulating warm water bath according to claim 1, further comprising a microcomputer that performs a DC pump slow start means.
The C pump slow start means is set by a program for controlling the microcomputer, and an effect is obtained that the DC pump slow start means can be easily realized.

The circulating warm water bath according to claim 3 of the present invention comprises:
The circulating warm water bath according to any one of claims 1 and 2, wherein in the DC pump slow start means, the amount of the circulating water flow at the start of washing the filter medium and the final amount at the time of washing the filter medium are determined. The final flow rate of the circulating water flow to be reached, and the number of steps and time from the start of cleaning of the filter medium to the final flow rate can be set from the outside. The amount of the circulating water flow, the final flow rate of the circulating water flow that finally arrives at the time of washing the filter medium, and the number of steps and time from the start of washing the filter medium to the final flow rate can be freely changed, The effect is obtained that the above-mentioned set amounts can be actually operated and set to optimal values in accordance with the shape of the filtration tank, the specific gravity of the filter medium, and the amount of circulating water.

The circulating warm water bath D according to claim 4 of the present invention.
The C pump control method includes a DC pump for creating a circulating water flow, a filtration tank filled with a filtering medium, and a circulating warm bath D for cleaning the filtering medium by switching the circulating water flow in the opposite direction.
A C-pump control method, comprising a DC pump slow-start procedure for gradually increasing the amount of circulating water flow at the start of washing the filter medium.
The effect is obtained that the unsteady vortex generated at the start of the backwashing of the filtration tank is suppressed and the outflow of the filtering material is prevented.

[Brief description of the drawings]

FIG. 1 shows a DC of a circulating warm water bath according to Embodiment 1 of the present invention.
Device block diagram of pump control unit

FIG. 2 is a flowchart of a DC pump control method for the circulating warm water bath according to the first embodiment.

FIG. 3 is a flowchart of a DC pump output setting process (A) of the circulating warm water bath according to the first embodiment.

FIG. 4 is a flowchart of a DC pump output setting process (B) of the circulating warm water bath according to the first embodiment.

FIG. 5 is a diagram showing an example of DC pump control data in a DC pump slow start procedure according to the first embodiment;

FIG. 6 is a diagram showing serial transfer data in a DC pump slow start procedure according to the first embodiment;

FIG. 7 is a block diagram of a water circulation path of a conventional circulating warm water bath.

FIG. 8 is a schematic view of a filtration tank of a conventional circulating warm water bath.

[Explanation of symbols]

 Reference Signs List 101 Microcomputer 102 D / A converter 103 Three-phase inverter 103a Triangular wave oscillation circuit 103b Comparator 104 Final stage drive circuit 105 Three-phase DC brushless motor 501 DC pump 502 Filtration tanks 503a, 503b Switching valve 601 Drain pipe 602 Above filtration tank Open end 603 Water inlet pipe 604 Filtering material 605 Connecting part

Claims (4)

[Claims] 1. A circulating warm water bath comprising a DC pump for producing a circulating water flow, and a filtration tank filled with a filtering material, wherein the circulating water flow is switched in a reverse direction to wash the filtering material. A circulating water bath comprising a DC pump slow start means for gradually increasing the amount of the circulating water flow at the start of cleaning of the material. 2. The circulating bath according to claim 1, further comprising a microcomputer for performing the DC pump slow start means. 3. The DC pump slow start means, wherein the amount of the circulating water flow at the start of the washing of the filter medium, the final flow rate of the circulating water flow finally reached at the time of washing the filter medium, and 3. The circulating warm water bath according to claim 1, wherein the number of steps and the time from when the cleaning of the material is started to when the final flow rate is reached can be set externally. 4. A DC pump control method for a circulating warm bath, comprising: a DC pump for producing a circulating water flow; and a filtration tank filled with a filtering material, wherein the circulating water flow is switched in a reverse direction to wash the filtering material. A DC pump slow start procedure for gradually increasing the amount of the circulating water flow at the start of washing the filter medium.