JP2017136538A - Ion exchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ion exchange device capable of sufficiently reducing bacterial count in a pressure tank accommodating an ion exchange resin bed.SOLUTION: There is provided an ion exchange device 1 having a pressure tank 2 accommodating an ion exchange resin bed 211, circulation means 3 having a water treatment mode for manufacturing treatment water W2 by introducing raw water W1 into the pressure tank 2 and a cleaning mode for cleaning the ion exchange resin bed 211 with continuously or intermittently generating upward flow in the pressure tank 2 by introducing a cleaning liquid W1 into the pressure tank 2 and a circulation controlling means 10 controlling the circulation means 3 to switch each modes based on predetermined mode transitional conditions.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an ion exchange apparatus including a pressure tank in which an ion exchange resin bed is accommodated.

  Conventionally, when the ion exchange apparatus is not used for a long time, water stays in the pressure tank in which the ion exchange resin bed made of the ion exchange resin beads is accommodated, and bacteria adhere to the ion exchange resin beads and propagate. Are known. In view of this, an ion exchange apparatus has been proposed in which, when the residence time of water existing for the longest time among the water existing in the pressure tank reaches a predetermined time, the cleaning process in the pressure tank is executed (for example, , See Patent Document 1).

  On the other hand, in order to reduce the operating cost of the ion exchange device, an ion exchange device having a function of a standby mode in which no fluid is introduced into the pressure tank has been proposed (for example, see Patent Document 2). In the ion exchange apparatus having the standby mode, for example, when the water treatment stop time (water retention time in the pressure tank) reaches a predetermined time, the standby mode is entered.

JP 2009-178666 A JP 2012-157793 A

  When the standby mode continues for a long time in the ion exchange device having the standby mode, water stays in the pressure tank for a long time, and bacteria propagate. In order to reduce the number of propagated bacteria, it is necessary to remove the bacteria attached to the ion exchange resin beads and wash the ion exchange resin bed.

  However, it is difficult to efficiently remove the bacteria attached to the ion exchange resin beads even if the ion exchange apparatus in which the standby mode has continued for a long period of time is washed as disclosed in Patent Document 1. For this reason, it is difficult to sufficiently reduce the number of bacteria contained in treated water (for example, soft water) produced after the standby mode.

  An object of this invention is to provide the ion exchange apparatus which can fully reduce the number of bacteria in the pressure tank in which an ion exchange resin bed is accommodated.

  The present invention provides a pressure tank in which an ion exchange resin bed is accommodated, a water treatment mode for producing treated water by introducing raw water into the pressure tank, and a pressure for introducing the cleaning liquid into the pressure tank. A flow means for continuously or intermittently generating an upward flow in the tank and washing the ion exchange resin bed, and the flow so as to switch each mode based on a predetermined mode transition condition A flow control means for controlling the means.

  In the cleaning mode, when an upward flow is intermittently generated in the pressure tank, an upward step for generating the upward flow in the pressure tank, and a downward step performed between the upward steps, The ion exchange apparatus further includes a cleaning process control means for controlling the flow means so as to switch the ascending process and the descending process based on a predetermined process transition condition, the cleaning process control means, In the ascending step, by introducing a cleaning liquid into the pressure tank, the flow means is controlled to generate an ascending flow in the pressure tank and wind up the ion exchange resin beads constituting the ion exchange resin bed. The cleaning process control means generates a downward flow in the pressure tank by introducing a cleaning liquid into the pressure tank in the descending process to generate the ion flow. The exchange resin beads so as to lower or the ion exchange resin beads so as to lower the natural sedimentation, and controls the distribution means, it is preferable.

  Further, the flow control means switches the mode from the cleaning mode to the water treatment mode when the ascending step and the descending step are alternately performed and the ascending step is performed a plurality of times. It is preferable to control the distribution means.

  The flow means further has a standby mode in which no fluid is introduced into the pressure tank as a mode, and the flow control means controls the flow means to switch the mode from the standby mode to the cleaning mode. Is preferable.

  Moreover, it is preferable that the said flow control means controls the said flow means in the said raising process so that the volume of the washing | cleaning liquid introduce | transduced into the said pressure tank may become larger than the amount of water holding | maintenance of the said pressure tank.

  ADVANTAGE OF THE INVENTION According to this invention, the ion exchange apparatus which can fully reduce the number of bacteria in the pressure tank in which an ion exchange resin bed is accommodated can be provided.

It is a whole water softening apparatus block diagram in case the flow-path switching valve which concerns on 1st Embodiment exists in a 1st state. It is a whole water softening apparatus block diagram in case the flow-path switching valve which concerns on 1st Embodiment exists in a 2nd state. It is a whole water softening apparatus block diagram in case the flow-path switching valve which concerns on 1st Embodiment exists in a 3rd state. It is a whole water softening apparatus block diagram in case the flow-path switching valve which concerns on 1st Embodiment exists in a 4th state. It is a figure which shows the state of the valve | bulb in each process which concerns on 1st Embodiment. It is a state transition diagram which shows the process in the operation mode and each operation mode of the ion exchange apparatus which concerns on 1st Embodiment. It is a figure which shows the state of the valve | bulb in each process which concerns on 2nd Embodiment. It is a state transition diagram which shows the process in the operation mode and each operation mode of the ion exchange apparatus which concerns on 2nd Embodiment. It is a figure which shows the state of the valve | bulb in each process which concerns on 3rd Embodiment. It is a state transition diagram which shows the process in the operation mode and each operation mode of the ion exchange apparatus which concerns on 3rd Embodiment.

Hereinafter, an embodiment in which the ion exchange device of the present invention is applied to a water softening device will be described.
(First embodiment)
The water softening device 1 according to the first embodiment will be described with reference to the drawings. FIGS. 1-4 is a whole block diagram of the water softening apparatus 1 in case the flow-path switching valve 31 which concerns on 1st Embodiment exists in a 1st state-a 4th state, respectively (after-mentioned).

  As shown in FIGS. 1-4, the water softening apparatus 1 which concerns on 1st Embodiment mainly has the pressure tank 2, the process control valve 3 as a distribution means, the salt water tank 4, the piping part 5, and distribution. And a control unit 10 that also functions as a control unit and a cleaning process control unit.

  The pressure tank 2 is a cylindrical body (for example, a cylinder) having a rounded bottom, and has an opening 21 at the top. Inside the pressure tank 2, a liquid collection / distribution pipe 231 extending from the center of the opening 21 to the vicinity of the bottom of the pressure tank 2 is provided. A top screen 241 is provided in an area of the opening 21 of the pressure tank 2 excluding the liquid collection and distribution pipe 231. A bottom screen 242 is provided between the lower end of the liquid collection and distribution pipe 231 and the bottom of the pressure tank 2. Therefore, the fluid that has flowed into the pressure tank 2 from the upper end of the liquid collection / distribution pipe 231 descends in the liquid collection / distribution pipe 231 and exits from the lower end through the bottom screen 242 to the outside of the liquid collection / distribution pipe 231. The interior space of the pressure tank 2 outside the pipe 231 rises and passes through the top screen 241 and exits from the pressure tank 2. On the contrary, the fluid that has flowed into the pressure tank 2 through the top screen 241 descends the internal space of the pressure tank 2, enters the collection / distribution pipe 231 through the bottom screen 242, and rises in the collection / distribution pipe 231. Then, it goes out of the pressure tank 2 from its upper end.

  An ion exchange resin bed 211 made of ion exchange resin beads (specifically, cation exchange resin beads) and a support bed 212 made of filtered gravel are accommodated in the internal space of the pressure tank 2 outside the collection and distribution pipe 231. The The support floor 212 is disposed on the bottom side of the pressure tank 2. The support floor 212 functions as a fluid rectifying member for the ion exchange resin bed 211. The ion exchange resin bed 211 is laminated above the support floor 212. The ion exchange resin bed 211 functions as a treatment material that softens the raw water W1.

  The ratio of the volume of the space 213 above the ion exchange resin bed 211 to the volume of the entire pressure tank 2 is preferably small. In other words, it is preferable that the filling rate of the ion exchange resin beads in the pressure tank 2 is high. This is because the higher the filling rate of the ion exchange resin beads, the higher the ion exchange performance per unit volume of the pressure tank 2.

  A process control valve 3 is attached to the opening 21 at the top of the pressure tank 2. The process control valve 3 includes a flow path switching valve 31, an ejector 33, a strainer 34, a brine valve 35, and a drain valve 36.

The process control valve 3 in the first embodiment introduces raw water W1 as treated water by introducing raw water W1 into the pressure tank 2, and introduces raw water W1 as cleaning liquid into the pressure tank 2. Thus, an upward flow is intermittently generated in the pressure tank 2 and the ion exchange resin bed 211 is washed, and a standby mode in which no fluid is introduced into the pressure tank 2 is provided.
In the cleaning mode, when an upward flow is intermittently generated in the pressure tank 2, an upward flow (in each embodiment, the upward process ST4) that generates the upward flow in the pressure tank 2, and the upward steps A descent process (a descent process ST5 in the first embodiment; a sedimentation process ST5A in the second embodiment).

  The process control valve 3 will be described in detail. The process control valve 3 includes a raw water line L12, soft water lines L21, L22, L23, L24, dilution water lines L31, L32, salt water lines L41, L42, L43, L44, and drainage lines L51, L52, L53, L54. And comprising. The “line” is a general term for a line capable of fluid flow such as a flow path, a path, and a pipeline.

  The flow path switching valve 31 includes a cylindrical valve housing 311 having an open end, and a cylindrical valve body 312. One end of the valve main body 312 is opened, is accommodated inside the valve housing 311, and can slide along the axial direction of the valve housing 311. The valve housing 311 includes four holes 3111 to 3114 at a predetermined interval along the axial direction on the peripheral wall thereof. The valve body 312 includes three seal portions 3121 to 3123. The three seal portions 3121 to 3123 protrude outward from the peripheral wall at a predetermined interval along the axial direction. The valve body 312 has one hole 3124 at the top.

  The open end of the flow path switching valve 31 is watertightly attached to the upper end of the collection and distribution pipe 231 of the pressure tank 2. One end of the raw water line L12 is connected to the other end of the raw water line L11. The other end of the raw water line L12 is connected to the first hole 3111 of the valve housing 311 of the flow path switching valve 31. One end of the soft water line L21 is watertightly connected to a region excluding the liquid collection and distribution pipe 231 at the opening 21 of the pressure tank 2. The other end of the soft water line L21 is connected to a connection point between one end of the soft water line L22 and one end of the salt water line L44. The other end of the soft water line L22 is connected to the third hole 3113 of the valve housing 311 of the flow path switching valve 31. One end of the soft water line L23 is connected to the second hole 3112 of the valve housing 311 of the flow path switching valve 31. The other end of the soft water line L23 is connected to a connection point between one end of the soft water line L24 and one end of the dilution water line L31. The other end of the soft water line L24 is connected to one end of the soft water line L25.

  The other end of the dilution water line L31 is connected to one side of the strainer 34. One end of a dilution water line L32 is connected to the other side of the strainer 34. The other end of dilution water line L32 is connected to one side of ejector 33. The other end of the salt water line L44 is connected to the other side of the ejector 33. One end of a salt water line L43 is connected to the suction port of the ejector 33. The other end of the salt water line L43 is connected to one side of the brine valve 35. One end of a salt water line L42 is connected to the other side of the brine valve 35. The other end of the salt water line L42 is connected to one side of a salt water flow meter 44 provided outside the process control valve 3. One end of a salt water line L41 is connected to the other side of the salt water flow meter 44. The other end of the salt water line L <b> 41 is connected to a salt water take-out portion of the salt water tank 4. One end of the drain line L51 is connected to the fourth hole 3114 of the valve housing 311 of the flow path switching valve 31. The other end of the drain line L51 is connected to one side of the drain valve 36. One end of a drain line L52 is connected to the other side of the drain valve 36. The other end of the drain line L52 is connected to a connection point between one end of the drain line L53 and one end of the drain line L54. The other end of the drain line L53 is connected to the overflow part of the salt water tank 4. The other end of the drainage line L54 is released to a drainage groove or the like outside the system.

  The process control valve 3 includes a raw water line L11 extending from the raw water introduction part (not shown) of the pipe part 5 to the process control valve 3, and a soft water line extending from the process control valve 3 to the soft water outlet part (not shown) of the pipe part 5. L25 is connected.

  One end of the raw water line L11 is connected to a raw water introduction part (not shown). The other end of the raw water line L11 is connected to one end of the raw water line L12.

  One end of the soft water line L25 is connected to the other end of the soft water line L24. The other end of the soft water line L25 is connected to a soft water lead-out part (not shown). The raw water line L11 and the soft water line L25 constitute the piping part 5.

The salt water tank 4 is a cylindrical body (for example, a square tube), and has an opening at the top. Inside the salt water tank 4, salt water W3 as a regenerating liquid for regenerating the ion exchange resin bed 211 is stored. As the salt water W3, aqueous solutions of sodium chloride and potassium chloride can be used in a water softening apparatus using cation exchange resin beads.

  The control unit 10 is configured by a microprocessor (not shown) including a CPU and a memory. In the control unit 10, the CPU of the microprocessor executes various controls related to the water softening device 1 according to a predetermined program read from the memory.

  Further, the control unit 10 functions as a flow control means for controlling the process control valve 3 so as to switch each mode based on a predetermined mode transition condition. The control unit 10 as the flow control means controls the process control valve 3 so as to change the state of the flow path switching valve 31 of the process control valve 3 from, for example, a first state to a fourth state. As a result, in the pressure tank 2, a fluid flow is generated or no fluid flow is generated for each of the processes ST1 to ST7.

When the ascending process and the descending process are alternately performed and the ascending process is performed a plurality of times (an example of the mode transition condition), the control unit 10 serving as the distribution control unit changes the mode from the cleaning mode to the water treatment. The process control valve 3 is controlled to switch to the mode.
The control unit 10 serving as a flow control means controls the process control valve 3 so as to switch the mode from the standby mode to the cleaning mode.

In the ascending process, the control unit 10 as the flow control means controls the process control valve 3 so that the volume of the raw water W1 as the cleaning liquid introduced into the pressure tank 2 is larger than the amount of water held in the pressure tank 2.
Note that the amount of retained water [L] in the pressure tank 2 is, for example, from the volume [L] of the pressure tank 2, the volume [LR] of the ion exchange resin bed 211, and the porosity of the ion exchange resin bed 211 as follows: It can be calculated using a relational expression.
Retained water volume = pressure tank volume-ion exchange resin bed volume x (1-porosity)

  Further, the control unit 10 functions as a cleaning process control unit that controls the process control valve 3 so as to switch the ascending process and the descending process based on a predetermined process transition condition.

  The control unit 10 as the cleaning process control means in the first embodiment performs the descending process for a predetermined time (an example of process transition condition), and then introduces raw water W1 as the cleaning liquid into the pressure tank 2 in the ascending process. The process control valve 3 is controlled so as to generate an upward flow in the pressure tank 2 and wind up the ion exchange resin beads constituting the ion exchange resin bed 211. Further, the control unit 10 as the cleaning process control means executes the ascending process for a predetermined time (an example of process transition condition), and then introduces the raw water W1 as the cleaning liquid into the pressure tank 2 in the descending process, whereby the pressure tank The process control valve 3 is controlled so as to generate a downward flow in 2 and to lower the ion exchange resin beads. The ion exchange resin bed 211 is cleaned by generating an upward flow or a downward flow in the pressure tank 2.

  Next, the state of the flow path switching valve 31 switched in the process control valve 3 will be described. The process control valve 3 switches the state of the flow path switching valve 31 (positional relationship between the valve housing 311 and the valve body 312) to the first to fourth states shown below, as shown in FIGS. Can do.

<First state>
As shown in FIG. 1, in the flow path switching valve 31, when the first seal portion 3121 of the valve body 312 is positioned between the first hole 3111 and the second hole 3112 of the valve housing 311, The second seal portion 3122 is located between the third hole 3113 and the fourth hole 3114 of the valve housing 311, and the third seal portion 3123 of the valve body 312 is connected to the fourth hole 3114 of the valve housing 311 and the open end portion. Located between and. At this time, the first hole 3111 of the valve housing 311 has a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312, the space inside the top of the valve housing 311, and the top of the valve body 312. It communicates with the space inside the valve body 312 through the hole 3124. That is, the first hole 3111 of the valve housing 311 communicates with the upper end portion of the liquid collection and distribution pipe 231 of the pressure tank 2. The second hole 3112 and the third hole 3113 of the valve housing 311 communicate with each other through a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. The fourth hole 3114 of the valve housing 311 does not communicate with the other holes or the space inside the valve body 312. Hereinafter, this positional relationship is referred to as a first state of the flow path switching valve 31 (see a water treatment process ST1 and a water replenishment process ST6 described later).

<Second state>
As shown in FIG. 2, in the flow path switching valve 31, when the first seal portion 3121 of the valve body 312 is located between the first hole 3111 and the top portion of the valve housing 311, the second seal of the valve body 312. The portion 3122 is located between the second hole 3112 and the third hole 3113 of the valve housing 311, and the third seal portion 3123 of the valve body 312 is formed between the third hole 3113 and the fourth hole 3114 of the valve housing 311. Located between. At this time, the first hole 3111 of the valve housing 311 communicates with the second hole 3112 of the valve housing 311 through a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. The third hole 3113 of the valve housing 311 does not communicate with other holes or the space inside the valve body 312. The fourth hole 3114 of the valve housing 311 communicates with the opening end side of the valve body 312. That is, the fourth hole 3114 of the valve housing 311 communicates with the upper end of the liquid collection and distribution pipe 231 of the pressure tank 2. Hereinafter, this positional relationship is referred to as a second state of the flow path switching valve 31 (see the regeneration process ST2 and the extrusion process ST3 described later).

<Third state>
As shown in FIG. 3, in the flow path switching valve 31, when the first seal portion 3121 of the valve body 312 is in a position corresponding to the first hole 3111 of the valve housing 311 and does not block the first hole 3111, The second seal portion 3122 of the valve body 312 is located between the second hole 3112 and the third hole 3113 of the valve housing 311, and the third seal portion 3123 of the valve body 312 is the fourth hole 3114 of the valve housing 311. And the upper end of the liquid collection and distribution pipe 231 of the pressure tank 2. At this time, the first hole 3111 of the valve housing 311 has a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312, the space inside the top of the valve housing 311, and the top of the valve body 312. It communicates with the space inside the valve body 312 through the hole 3124. In other words, the first hole 3111 of the valve housing 311 communicates with the upper end portion of the liquid collection and distribution pipe 231 of the pressure tank 2 and through a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. In addition, the valve housing 311 communicates with the second hole 3112. The third hole 3113 and the fourth hole 3114 of the valve housing 311 communicate with each other via a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. Hereinafter, this positional relationship is referred to as a third state of the flow path switching valve 31 (see ascending process ST4 described later).

<Fourth state>
As shown in FIG. 4, in the flow path switching valve 31, when the second seal portion 3122 of the valve body 312 is in a position corresponding to the second hole 3112 of the valve housing 311 and does not block the second hole 3112, The first seal portion 3121 of the valve body 312 is located between the first hole 3111 and the top portion of the valve housing 311, and the third seal portion 3123 of the valve body 312 is connected to the third hole 3113 of the valve housing 311 and the fourth hole 3113. Located between the hole 3114. At this time, the second hole 3112 of the valve housing 311 communicates with the first hole 3111 of the valve housing 311 through a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. The valve housing 311 also communicates with the third hole 3113 of the valve housing 311 through a predetermined gap between the inner surface of the peripheral wall of the valve housing 311 and the outer surface of the peripheral wall of the valve body 312. The fourth hole 3114 of the valve housing 311 communicates with the opening end side of the valve body 312. That is, the fourth hole 3114 of the valve housing 311 communicates with the upper end of the liquid collection and distribution pipe 231 of the pressure tank 2. Hereinafter, this positional relationship is referred to as a fourth state of the flow path switching valve 31 (see a descending process ST5 described later).

  Next, processes executed in each operation mode (described later) controlled by the process control valve 3 will be described with reference to FIG. FIG. 5 is a diagram illustrating a state of a valve in each process according to the first embodiment. In FIG. 5, “◯”, “×”, and “−” mean “open state”, “closed state”, and “state unquestioned”, respectively. The same applies to FIGS. 7 and 9 described later.

  As shown in FIG. 5, the process control valve 3 executes the following processes ST1 to ST7 in each operation mode (described later) while switching the state of the flow path switching valve 31 and the open / closed state of the brine valve 35 and the drain valve 36. To do. As a result, a fluid flow is generated in the pressure tank 2 for each of the processes ST1 to ST6. In the standby process ST7, no fluid flow is generated.

<Water treatment process ST1>
As shown in FIG. 5, in the water treatment process ST1, in the process control valve 3, the flow path switching valve 31 is in the first state, the brine valve 35 is in the closed state, and the drain valve 36 is in the closed state.

  Therefore, the raw water W1 introduced into the hard water softening device 1 from the raw water introduction part sequentially flows through the raw water line L11, the raw water line L12, the first hole 3111 and the hole 3124 of the flow path switching valve 31, and is collected and distributed in the pressure tank 2. Supplied to the pipe 231 and distributed from the bottom screen 242. The raw water W1 distributed from the bottom screen 242 passes through the ion exchange resin bed 211 in an upward flow. In the process, the hardness component of the raw water W1 is replaced with sodium ions (or potassium ions), and the raw water W1 is softened.

  The treated water (soft water W <b> 2) that has passed through the ion exchange resin bed 211 is collected on the top screen 241 at the top of the pressure tank 2. Thereafter, the soft water W2 sequentially flows through the soft water line L21, the soft water line L22, the third hole 3113 and the second hole 3112 of the flow path switching valve 31, the soft water line L23, the soft water line L24, and the soft water line L25 from the soft water outlet. It is derived to the outside of the water softening device 1 and supplied to the demand point of the soft water W2. The soft water W2 flows in parallel with the soft water line L22, the third hole 3113 and the second hole 3112 of the flow path switching valve 31, and the soft water line L23, in parallel with the salt water line L44, the ejector 33, the dilution water line L32, It flows through the strainer 34 and the dilution water line L31 sequentially.

<Reproduction process ST2>
As shown in FIG. 5, in the regeneration process ST2, in the process control valve 3, the flow path switching valve 31 is in the second state, the brine valve 35 is in the open state, and the drain valve 36 is in the open state. Further, a salt water control valve (not shown) that can prevent the salt water W3 from flowing from the salt water take-out portion of the salt water tank 4 to the salt water line L41 is in an open state.

  Therefore, the raw water W1 introduced into the hard water softening device 1 from the raw water introduction unit is the raw water line L11, the raw water line L12, the first hole 3111 and the second hole 3112 of the flow path switching valve 31, the soft water line L23, and the dilution water line L31. , The strainer 34, the dilution water line L32, and the ejector 33 sequentially flow. As the raw water W1 flows through the ejector 33 at a predetermined pressure, a suction force is generated at the suction port of the ejector 33. Due to this suction force, the salt water W3 stored in the salt water tank 4 is sucked into the suction port of the ejector 33 through the salt water line L41, the salt water flow meter 44, the salt water line L42, the brine valve 35, and the salt water line L43 in this order. Be turned. As a result, the salt water W3 and the raw water W1 are mixed in the ejector 33 to become a salt water W3 having a predetermined concentration (about 10% by weight).

  The salt water W3 having a predetermined concentration is distributed from the top screen 241 disposed at the top of the pressure tank 2 through the salt water line L44 and the soft water line L21, and passes through the pressure tank 2 in a downward flow. In the process, the salt water W3 regenerates the ion exchange resin bed 211. The used salt water W3 is collected by a bottom screen 242 disposed at the bottom of the pressure tank 2 and rises in the collection and distribution pipe 231 of the pressure tank 2, and passes through the fourth hole 3114 of the flow path switching valve 31 and drainage. The water flows through the line L51, the drain valve 36, the drainage line L52, and the drainage line L54 in order, and is drained outside the system. This regeneration process ST2 is executed for a predetermined time and is completed by supplying a predetermined amount of salt water W3.

  The raw water W1 flowing through the soft water line L23 flows to the dilution water line L31 and also flows to the soft water line L24. Therefore, the excessive raw water W1 for diluting the salt water W3 to a predetermined concentration sequentially flows from the soft water line L24 through the soft water line L25 and the soft water outlet, and is temporarily supplied to the demand point of the soft water W2.

<Extrusion process ST3>
As shown in FIG. 5, in the extrusion process ST3, in the process control valve 3, the flow path switching valve 31 is in the second state, the brine valve 35 is in the open state, and the drain valve 36 is in the open state. This is the same as the reproduction process ST2 shown in FIG. However, a valve (not shown) that can prevent the flow of the salt water W3 from the salt water extraction portion of the salt water tank 4 to the salt water line L41 is provided inside the salt water tank 4. This valve is open in the regeneration process ST2 and does not prevent the flow of the salt water W3, whereas it is closed in the extrusion process ST3 and prevents the flow of the salt water W3.

  Therefore, the raw water W1 introduced into the hard water softening device 1 from the raw water introduction unit is the raw water line L11, the raw water line L12, the first hole 3111 and the second hole 3112 of the flow path switching valve 31, the soft water line L23, and the dilution water line L31. Water is distributed from the top screen 241 disposed at the top of the pressure tank 2 through the strainer 34, the dilution water line L32, the ejector 33, the salt water line L44, and the soft water line L21, and passes through the pressure tank 2 in a downward flow. . In the process, the raw water W1 continuously regenerates the ion exchange resin bed 211 while pushing out the salt water W3 supplied in advance. The used salt water W3 and raw water W1 are collected by a bottom screen 242 disposed at the bottom of the pressure tank 2 and ascend in the liquid collection and distribution pipe 231 of the pressure tank 2, and the fourth hole of the flow path switching valve 31. 3114, the drain line L51, the drain valve 36, the drain line L52, and the drain line L54 are sequentially flowed to be drained outside the system. This extrusion process ST3 is executed for a predetermined time, and is completed by supplying a predetermined amount of raw water W1 and extruding the salt water W3.

  The raw water W1 flowing through the soft water line L23 flows to the dilution water line L31 and also flows to the soft water line L24. Therefore, the raw water W1 that is excessive to push out the salt water W3 flows in order from the soft water line L24 to the soft water line L25 and the soft water outlet, and is temporarily supplied to the demand point of the soft water W2.

<Rising process ST4>
As shown in FIG. 5, in the ascending process ST4 as the ascending process, in the process control valve 3, the flow path switching valve 31 is in the third state, the brine valve 35 is in the closed position, and the drain valve 36 is in the open position. It is in.

  Therefore, the raw water W1 as the cleaning liquid introduced from the raw water introduction unit into the hard water softening device 1 passes through the raw water line L11, the raw water line L12, and the first hole 3111 of the flow path switching valve 31, and from the first hole 3111 on the one hand. The second hole 3112 and the soft water line L23 sequentially flow. On the other hand, the flow flows through the hole 3124 and is supplied to the liquid collection and distribution pipe 231 of the pressure tank 2 and distributed from the bottom screen 242. Since the raw water W <b> 1 distributed from the bottom screen 242 passes through the ion exchange resin bed 211 in an upward flow, an upward flow is generated in the pressure tank 2. In the process of passing through the inside of the pressure tank 2 as an upward flow, the raw water W <b> 1 generates an upward flow in the pressure tank 2 and cleans the ion exchange resin bed 211. Specifically, the upward flow generated in the pressure tank 2 winds up the ion exchange resin beads on the ion exchange resin bed 211 and causes the ion exchange resin beads to collide with each other. Therefore, the bacteria attached to the ion exchange resin beads are peeled off. Note that the peeled bacteria are discharged from the top screen 241 together with the raw water W1.

  The fluid discharged from the pressure tank 2 is collected by the top screen 241 disposed at the top of the pressure tank 2, and the soft water line L 21, the soft water line L 22, the third hole 3113 and the fourth hole 3114 of the flow path switching valve 31. The drainage line L51, the drain valve 36, the drainage line L52, and the drainage line L54 sequentially flow and drain out of the system.

This ascent process ST4 is executed for a predetermined time, and is completed, for example, when the volume of the raw water W1 as the first cleaning liquid introduced into the pressure tank 2 becomes larger than the amount of water retained in the pressure tank 2.
The execution time of the ascending process ST4 is, for example, 4 to 10 minutes.

  The raw water W1 flowing through the soft water line L23 flows from the soft water line L24 to the soft water line L25 and the soft water lead-out portion in order, and is temporarily supplied to the demand point of the soft water W2.

<Descent process ST5>
As shown in FIG. 5, in the descending process ST5 as the descending process, in the process control valve 3, the flow path switching valve 31 is in the fourth state, the brine valve 35 is in the closed position, and the drain valve 36 is in the open position. It is in.

  Therefore, the raw water W1 as the cleaning liquid introduced from the raw water introduction unit into the hard water softening device 1 passes through the raw water line L11, the raw water line L12, the first hole 3111 and the second hole 3112 of the flow path switching valve 31, and this second From the hole 3112, on the one hand, the flow passes through the soft water line L23, the dilution water line L31, the strainer 34, the dilution water line L32, the ejector 33, and the salt water line L44, and on the other hand, the third hole 3113 of the flow path switching valve 31 and the soft water The flow passes through the line L22. Both of these flows merge at the soft water line L21 to form one flow, which is distributed from the top screen 241 disposed at the top of the pressure tank 2 and passes through the inside of the pressure tank 2 in a downward flow. A downward flow is generated in the tank 2. In the process of passing through the inside of the pressure tank 2 in a downward flow, the raw water W <b> 1 generates a downward flow in the pressure tank 2 and cleans the ion exchange resin bed 211. Specifically, the downward flow generated in the pressure tank 2 precipitates suspended matters such as ion exchange resin beads and bacteria floating in the pressure tank 2. The bacteria contained in the suspended matter are discharged from the bottom screen 242 together with the raw water W1.

  The fluid discharged from the pressure tank 2 is collected by the bottom screen 242 disposed at the bottom of the pressure tank 2, and moves up in the collection and distribution pipe 231 of the pressure tank 2. 3114, the drain line L51, the drain valve 36, the drain line L52, and the drain line L54 are sequentially flowed to be drained outside the system.

  This descending process ST5 is executed for a predetermined time. The execution time of the descending process ST5 is, for example, 1 to 3 minutes.

Also in the descending process ST5, the raw water W1 flowing through the soft water line L23 flows to the dilution water line L31 and also flows to the soft water line L24. Therefore, the excessive soft water W2 flows in order from the soft water line L24 to the soft water line L25 and the soft water lead-out part in order, and is temporarily supplied to the demand location of the soft water W2.
The raw water W1 flowing through the soft water line L23 flows to the dilution water line L31 and also flows to the soft water line L24. Therefore, the excessive raw water W1 flows from the soft water line L24 to the soft water line L25 and the soft water lead-out portion sequentially, and is temporarily supplied to the demand point of the soft water W2.

  The number of repetitions of the ascending process ST4 and the descending process ST5 in one cleaning mode is, for example, 3 to 5 times.

<Replenishment process ST6>
As shown in FIG. 5, in the water replenishment process ST6, in the process control valve 3, the flow path switching valve 31 is in the first state, the brine valve 35 is in the open state, and the drain valve 36 is in the closed state.

  Therefore, the raw water W1 introduced into the hard water softening device 1 from the raw water introduction part sequentially flows through the raw water line L11, the raw water line L12, the first hole 3111 and the hole 3124 of the flow path switching valve 31, and is collected and distributed in the pressure tank 2. Supplied to the pipe 231 and distributed from the bottom screen 242. The raw water W1 distributed from the bottom screen 242 passes through the ion exchange resin bed 211 in an upward flow. In the process, the hardness component of the raw water W1 is replaced with sodium ions (or potassium ions), and the raw water W1 is softened.

  The treated water (soft water W <b> 2) that has passed through the ion exchange resin bed 211 is collected on the top screen 241 at the top of the pressure tank 2. Thereafter, the soft water W2 passes through the soft water line L21, and from the soft water line L21, on the one hand, the salt water line L44, the salt water line L43, the brine valve 35, the salt water line L42, the salt water flow meter 44, and the salt water line L41 sequentially. It is supplied (supplemented water) into the salt water tank 4. On the other hand, the soft water W2 sequentially flows through the soft water line L22, the third hole 3113 and the second hole 3112 of the flow path switching valve 31, the soft water line L23, the soft water line L24, and the soft water line L25. It is derived to the outside of the softening device 1 and supplied to the demand point of the soft water W2.

<Standby process ST7>
In the standby process ST7, the liquid in the pressure tank 2 is not controlled regardless of the state of the process control valve 3.

  Next, an operation mode of the water softening device 1, a process executed in the operation mode, and a transition condition for switching the operation mode will be described with reference to FIG. FIG. 6 is a state transition diagram showing operation modes of the ion exchange apparatus according to the first embodiment and processes in each operation mode.

  The water softening device 1 has a water treatment mode, a regeneration mode, a cleaning mode, a water replenishment mode, and a standby mode as operation modes.

  The water treatment mode is a mode for producing treated water (soft water W2) by introducing the raw water W1 into the pressure tank 2. In the water treatment mode, the control unit 10 as the distribution control means executes the water treatment process ST1.

  The regeneration mode is a mode in which the ion exchange resin bed 211 is regenerated by introducing salt water W3 as a regeneration solution into the pressure tank 2. In the regeneration mode, the control unit 10 as the distribution control means sequentially executes the regeneration process ST2 and the extrusion process ST3.

  The cleaning mode in the first embodiment is a mode in which the ion exchange resin bed 211 is cleaned by mainly generating an upward flow in the pressure tank 2. Specifically, this mode is a mode in which the raw water W <b> 1 as a cleaning liquid is introduced into the pressure tank 2 to intermittently generate an upward flow in the pressure tank 2 and clean the ion exchange resin bed 211.

  When the upward flow is generated intermittently in the pressure tank 2, the cleaning mode includes an upward process ST4 as an upward process and a downward process ST5 as a downward process executed between the upward processes ST4. In this case, the control unit 10 as the cleaning process control means controls the process control valve 3 so as to switch the ascending process (ascending process ST4) and the descending process (descent process ST5) based on a predetermined process transition condition. . In the ascending process (ascending process ST4), the control unit 10 serving as a cleaning process control unit controls the process control valve 3 so as to clean the ion exchange resin bed 211. On the other hand, in the descent process (descent process ST5), the process control valve 3 controls the process control valve 3 so as to wash the ion exchange resin bed 211.

The water replenishment mode is a mode in which the raw water W1 is replenished to the salt water tank 4. In the water replenishment mode, the control unit 10 as the distribution control means executes a water replenishment process ST6.
The standby mode is a mode in which the liquid in the pressure tank 2 is not controlled (no fluid is introduced into the pressure tank 2) by the standby process ST7. In the standby mode, the control unit 10 as the distribution control means executes a standby process ST7.

  As shown in FIG. 6, the control unit 10 as the distribution control unit controls the process control valve 3 so as to switch each operation mode based on a predetermined transition condition (event). In FIG. 6, the arrows described between the operation modes indicate events E1 to E8.

  Event E1 shows a case where the water treatment mode is shifted to the regeneration mode. As this transition condition, for example, when the integrated water intake (integrated usage) of the soft water W2 reaches a predetermined set amount, the integrated water treatment time of the raw water W1 reaches a predetermined set time, or the like. it can.

  Event E2 indicates a case where the regeneration mode is shifted to the cleaning mode. As this transfer condition, for example, the case where the regeneration process ST2 to the extrusion process ST3 are completed can be cited.

  Event E3 indicates a case where the mode is changed from the cleaning mode to the water replenishment mode. Examples of the transition condition include a case where the operation mode immediately before the transition to the cleaning mode is the regeneration mode and the ascending step (ascending process ST4) is executed a plurality of times (for example, three times) or more. it can.

  Event E4 indicates a case where the water supply mode is shifted to the water treatment mode. As this transfer condition, for example, a case where the amount of water replenishment (the amount of soft water W2 supplied to the salt water tank 4) reaches a predetermined set amount can be cited.

  Event E5 indicates a case where the water treatment mode is shifted to the cleaning mode. Examples of the transition condition include a case where the water treatment process ST1 is not executed for a predetermined time.

  Event E6 indicates a case where the cleaning mode is shifted to the water treatment mode. Examples of the transition condition include a case where the operation mode immediately before the transition to the cleaning mode is the water treatment mode and the ascending step (ascending process ST4) is executed a plurality of times (for example, three times) or more. .

  Event E7 shows a case where the cleaning mode is shifted to the standby mode. As this transition condition, for example, a case where the continuous detection time of “no distribution of raw water W1” reaches a predetermined set time (when water breakage occurs) can be cited.

  Event E8 indicates a case of transition from the standby mode to the cleaning mode. As this transition condition, for example, when the continuous detection time of “the circulation of the raw water W1” reaches a predetermined set time (when the water supply is restored), (the integrated distribution of the raw water or treated water to the pressure tank 2) When the integrated flow measured by the integrated flow measuring means is less than the amount of water held in the pressure tank 2, the continuous detection time of “the raw water W1 is distributed” has reached a predetermined set time. In the case where the integrated circulation amount measured by the integrated circulation amount measuring means is less than the amount of water held in the pressure tank 2, etc.

  According to the water softening device 1 according to the first embodiment described above, for example, the following effects are exhibited.

The water softening device 1 according to the first embodiment includes a pressure tank 2 in which an ion exchange resin bed 211 is accommodated, and a water treatment mode for producing soft water W2 as treated water by introducing raw water W1 into the pressure tank 2. In addition, a process control as a distribution means having a cleaning mode in which an upward flow is intermittently generated in the pressure tank 2 by introducing the raw water W1 as a cleaning liquid into the pressure tank 2 and the ion exchange resin bed 211 is cleaned. A valve 3 and a control unit 10 as a flow control means for controlling the process control valve 3 so as to switch each mode based on a predetermined mode transition condition.
Therefore, the upward flow generated in the pressure tank 2 intermittently winds up the ion exchange resin beads constituting the ion exchange resin bed 211 and causes the ion exchange resin beads to collide with each other. Therefore, the bacteria attached to the ion exchange resin beads are peeled off. Thereby, the number of bacteria in the pressure tank 2 can be reduced sufficiently.

Further, in the cleaning mode, when an upward flow is generated intermittently in the pressure tank 2, an upward process (the upward process ST4) that generates the upward flow in the pressure tank 2 and an upward process (the upward process ST4) A descent process (descent process ST5) executed in between. The ion exchange apparatus 1 includes a control unit 10 serving as a cleaning process control unit that controls the process control valve 3 to switch between an ascending process (ascending process ST4) and a descending process (descent process ST5) based on a predetermined process transition condition. Is further provided.
In the ascending process (ascending process ST4), the control unit 10 serving as a washing process control means introduces raw water W1 as a washing liquid into the pressure tank 2 to generate an ascending flow in the pressure tank 2 to generate an ion exchange resin bed. The process control valve 3 is controlled so as to wind up the ion exchange resin beads constituting the 211, and the control unit 10 as a cleaning process control means supplies the pressure tank 2 as a cleaning liquid in the descending process (descending process ST5). By introducing the raw water W1, the process control valve 3 is controlled so as to generate a downward flow in the pressure tank 2 and to lower the ion exchange resin beads.

  Therefore, the direction in which the ion exchange resin bed 211 is loosened is repeatedly switched. Since the ion exchange resin beads rolled up by the upward flow are lowered by the downward flow, the ion exchange resin beads repeatedly collide with each other, and bacteria attached to the ion exchange resin beads are efficiently peeled off. Further, the bacteria in the pressure tank 2 can be discharged together with the raw water W1 as the cleaning liquid by the upward flow and the downward flow. According to this, the number of bacteria in the pressure tank 2 can be reduced more efficiently.

  Further, even in the pressure tank 2 in which the volume ratio of the space 213 above the ion exchange resin bed 211 is small (the filling rate is high), the ion exchange resin beads hardly adhere to the top screen 241 of the pressure tank 2, High cleaning efficiency. Therefore, even if it is an ion exchange apparatus provided with the pressure tank 2 with a high filling rate, the number of bacteria in the pressure tank 2 can be reduced more efficiently.

In addition, the control unit 10 as the distribution control means performs the ascending process (the ascending process ST4) and the descending process (the descending process ST5) alternately, and the ascending process (the ascending process ST4) is performed a plurality of times. In this case, the process control valve 3 is controlled so as to switch the mode from the cleaning mode to the water treatment mode.
Therefore, the number of bacteria in the pressure tank 2 can be more efficiently reduced before shifting from the cleaning mode to the water treatment mode.

The process control valve 3 further has a standby mode in which no fluid is introduced into the pressure tank 2 as a mode. The control unit 10 serving as a flow control means controls the process control valve 3 so as to switch the mode from the standby mode to the cleaning mode.
Therefore, it shifts from the standby mode to the water treatment mode via the cleaning mode. According to this, even after the standby mode, the water treatment can be started hygienically with the number of bacteria sufficiently reduced.

In addition, the control unit 10 serving as a flow control means performs a process so that the volume of the raw water W1 as the cleaning liquid introduced into the pressure tank 2 is larger than the amount of water held in the pressure tank 2 in the ascending step (ascending process ST4). Control the control valve 3;
Therefore, in the rising process ST4, the fluid in the pressure tank 2 is more reliably replaced with the raw water W1 as the cleaning liquid introduced into the pressure tank 2. According to this, the bacteria in the pressure tank 2 can be more reliably discharged out of the pressure tank 2.

(Second Embodiment)
Next, a water softening device according to a second embodiment of the present invention will be described. In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. In the second embodiment, the description overlapping with the first embodiment is omitted as appropriate.

  The whole structure of the water softening apparatus which concerns on 2nd Embodiment is the same as the whole structure of the water softening apparatus 1 which concerns on 1st Embodiment shown in FIGS.

  Next, processes executed in each operation mode (described later) controlled by the process control valve 3 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating a state of a valve in each process according to the second embodiment.

  As shown in FIG. 7, the control unit 10 as the cleaning process control means executes a sedimentation process ST5A as a descending process instead of the descending process ST5 (see FIG. 5) as the descending process in the first embodiment. .

  In the sedimentation process ST5A, the liquid in the pressure tank 2 is not controlled regardless of the state of the process control valve 3. That is, the sedimentation process ST5A is a process in which the ion exchange resin beads constituting the ion exchange resin bed 211 are lowered by natural sedimentation.

  Next, an operation mode of the water softening device 1, a process executed in the operation mode, and a transition condition for switching the operation mode will be described with reference to FIG. FIG. 8 is a state transition diagram showing an operation mode and processes in each operation mode of the ion exchange apparatus according to the second embodiment.

  As shown in FIG. 8, the control unit 10 as a cleaning process control unit executes a sedimentation process ST5A instead of the descending process ST5 (see FIG. 5) in the cleaning mode.

  The cleaning mode in the second embodiment is a mode in which the ion exchange resin bed 211 is cleaned by mainly generating an upward flow in the pressure tank 2. Specifically, this mode is a mode in which the raw water W <b> 1 as a cleaning liquid is introduced into the pressure tank 2 to intermittently generate an upward flow in the pressure tank 2 and clean the ion exchange resin bed 211.

  In the ascending process ST4 as the ascending process, the control unit 10 as the washing process control means in the second embodiment generates an upward flow in the pressure tank 2 by introducing the raw water W1 as the washing liquid into the pressure tank 2. The process control valve 3 is controlled so as to wind up the ion exchange resin beads constituting the ion exchange resin bed 211. The process control valve 3 controls a bypass valve (not shown) so that the ion exchange resin beads are lowered by natural sedimentation in the sedimentation process ST5A as a descending step. By not controlling the flow of the liquid in the pressure tank 2, the ion exchange resin beads descend by natural sedimentation.

<Sedimentation process ST5A>
As shown in FIG. 7, in the sedimentation process ST <b> 5 </ b> A as the descending step, the liquid in the pressure tank 2 is not controlled regardless of the state of the process control valve 3. The state of the valve in the sedimentation process ST5A is not limited as long as the liquid does not move to the pressure tank 2. For example, in the process control valve 3, the flow path switching valve 31 is in the fourth state, and the brine valve 35 is closed. The drain valve 36 is in the closed position. For this reason, the liquid is not controlled in the pressure tank 2, and floating substances such as ion exchange resin beads and bacteria floating in the pressure tank 2 descend by natural sedimentation. The sedimentation process ST5A is executed for a predetermined time. The execution time of the sedimentation process ST5A is, for example, 1 to 3 minutes.

  According to the water softening device according to the second embodiment described above, the same effects as the water softening device 1 according to the first embodiment are exhibited.

(Third embodiment)
Next, a water softening device according to a third embodiment of the present invention will be described. In the third embodiment, differences from the first embodiment will be mainly described. In the third embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. In the third embodiment, the description overlapping with that of the first embodiment is omitted as appropriate.

  The whole structure of the water softening apparatus which concerns on 3rd Embodiment is the same as the whole structure of the water softening apparatus 1 which concerns on 1st Embodiment shown in FIGS.

  Next, processes executed in each operation mode (described later) controlled by the process control valve 3 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 9 is a diagram illustrating a state of a valve in each process according to the third embodiment.

  As shown in FIG. 9, the controller 10 as the cleaning process control means does not execute the descending process ST5 (see FIG. 5) (or the sedimentation process ST5A (see FIG. 7)) as the descending process.

  Next, the operation mode of the water softening apparatus 1, the process executed in the operation mode, and the transition conditions for switching the operation mode will be described with reference to FIG. FIG. 10 is a state transition diagram showing an operation mode and processes in each operation mode of the ion exchange device according to the third embodiment.

  As shown in FIG. 10, the process control valve 3 continuously executes the ascending process ST4 without executing the descending process ST5 (see FIG. 5) in the cleaning mode.

  The cleaning mode in the third embodiment is a mode in which the ion exchange resin bed 211 is cleaned by generating an upward flow in the pressure tank 2. Specifically, this is a mode in which the raw water W1 as a cleaning liquid is introduced into the pressure tank 2 to continuously generate an upward flow in the pressure tank 2 and clean the ion exchange resin bed 211.

  According to the water softening device according to the third embodiment described above, the same effect as the water softening device 1 according to the first embodiment is exhibited.

  As mentioned above, although preferred embodiment of this invention was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above.

  For example, an example in which the cleaning mode is a mode in which the ion exchange resin bed 211 is mainly cleaned by mainly generating an upward flow in the pressure tank 2 has been described. Note that “mainly” means that the upward flow is made to flow in a larger amount at a higher speed for a longer time, for example. However, the cleaning mode may be a mode in which the ion exchange resin bed 211 is cleaned mainly by generating a downward flow in the pressure tank 2.

  Moreover, in the said embodiment, when an upward flow was produced | generated intermittently in the pressure tank 2, the washing | cleaning mode demonstrated the example which has the descent | fall process performed between ascending processes. However, the lowering process is not performed between the rising processes. For example, it may be executed before and after the ascending process.

  Moreover, in the said embodiment, although the control part 10 as a distribution control means controls the process control valve 3 so that a mode may be switched from a standby mode to a washing | cleaning mode, it is not restrict | limited to this. The control unit 10 may control the process control valve 3 so that the mode is switched from the standby mode to the cleaning mode when the ion exchange device 1 is turned on.

In the above-described embodiment, the ion exchange device of the present invention is applied to the water softening device, but is not limited thereto. For example, if the ion exchange resin in the water softening device is replaced from a cation exchange resin to an anion exchange resin, it can be used as a nitrate nitrogen removal device.
The cleaning liquid is not limited to the raw water W1. The distribution means is not limited to the process control valve 3.

1 Water softener (ion exchanger)
2 Pressure tank 3 Process control valve (distribution means)
10 Control unit (distribution control means, cleaning process control means)
211 Ion exchange resin bed W1 Raw water, cleaning liquid W2 Soft water (treated water)
ST4 Ascending process (ascending process)
ST5 Descent process (Descent process)
ST5A Sedimentation process (Descent process)

Claims (5)

A pressure tank containing an ion exchange resin bed;
By introducing raw water into the pressure tank, a water treatment mode for producing treated water, and by introducing a cleaning liquid into the pressure tank, an upward flow is generated continuously or intermittently in the pressure tank, A cleaning mode for cleaning the ion-exchange resin bed,
Distribution control means for controlling the distribution means to switch each mode based on a predetermined mode transition condition;
An ion exchange apparatus comprising: The cleaning mode includes an ascending process for generating an ascending flow in the pressure tank when an ascending flow is intermittently generated in the pressure tank, and a descending process performed between the ascending processes. And
The ion exchange apparatus further includes a cleaning process control means for controlling the flow means so as to switch the ascending process and the descending process based on a predetermined process transition condition,
In the ascending step, the washing process control means introduces a washing liquid into the pressure tank so as to generate an upflow in the pressure tank and wind up the ion exchange resin beads constituting the ion exchange resin bed. Controlling the distribution means;
Further, in the descending step, the cleaning process control means introduces a cleaning liquid into the pressure tank so as to generate a downward flow in the pressure tank to lower the ion exchange resin beads, or The ion exchange apparatus according to claim 1, wherein the flow means is controlled so that the ion exchange resin beads are lowered by natural sedimentation.   The flow control means is configured to switch the mode from the cleaning mode to the water treatment mode when the ascending step and the descending step are alternately performed and the ascending step is performed a plurality of times. The ion exchange apparatus of Claim 2 which controls a distribution means. The flow means further has a standby mode in which no fluid is introduced into the pressure tank as a mode,
The ion exchange apparatus according to claim 2 or 3, wherein the flow control means controls the flow means to switch the mode from the standby mode to the cleaning mode.   5. The flow control means according to claim 2, wherein the flow control means controls the flow means so that a volume of the cleaning liquid introduced into the pressure tank is larger than an amount of water retained in the pressure tank in the rising step. The ion exchange apparatus as described in.

Images