JP2008064019A - Constant flow rate ejector and ion exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant flow rate ejector having high suction force to prevent or suppress pressurized water head from lowering, and an ion exchanger capable of stably feeding a regenerative liquid. <P>SOLUTION: In the ejector, an annular elastic body 11 having a hole 12 through which a drive liquid passes, and providing a function of making a flow rate constant is doubled as a nozzle 10. In the ejector, the annular elastic body 11 having the hole 12 through which the drive liquid passes, and providing a function of making the flow rate constant is provided near the upstream side of the nozzle 10. In the ion exchanger, the ejector in which the annular elastic body 11 having the hole 12 through which the drive liquid passes, and providing the function of making the flow rate constant is also used as the nozzle 10, and the annular elastic body 11 having the hole 12 through which the drive liquid passes, and providing the function of making the flow rate constant are provided near the upstream side of the nozzle 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a constant flow ejector having a constant flow rate function and an ion exchange apparatus using the constant flow ejector.

  There is known an ion exchange apparatus that adsorbs and removes hardness components (calcium ions and magnesium ions), nitrate nitrogen (nitrate ions and nitrite ions), etc. contained in raw water such as tap water and groundwater by an ion exchange resin. Among these ion exchange devices, those that use cation exchange resin to replace the hardness in water with sodium ions or potassium ions are usually called soft water devices. On the other hand, among the ion exchange devices, those that use anion exchange resin to replace nitrate nitrogen with chloride ions are usually called nitrate nitrogen removal devices.

  In the regeneration of the soft water device, in order to maintain the contact time between the ion exchange resin suitable for regeneration and the salt water as the regenerant stock solution, as described in Patent Document 1, a constant flow valve or the like is provided upstream of the ejector. It has been proposed to provide a constant flow rate means.

JP-A-11-156354

  The inventor of this application has found that the following problem exists in the method of Patent Document 1. That is, as in Patent Document 1, when the constant flow rate adjusting means is provided at a position away from the ejector nozzle, a pressure loss is generated by the constant flow rate adjusting means, and the driving head pressure decreases. As a result, the pressurized water head pressure of the ejector decreases, and a sufficient salt water suction force cannot be obtained. Here, the “driving water head pressure” is a value obtained by dividing (driving water pressure−pressure of the jet at the nozzle outlet) by the specific weight of the fluid. The “pressurized head pressure” representing the suction force of the ejector is a value obtained by dividing (pressure of the discharge liquid at the discharge port−pressure of the suction liquid at the suction port) by the specific weight of the fluid.

  The problem to be solved by the present invention is to provide a constant flow rate ejector having a high suction force that prevents or suppresses a decrease in pressurized water head pressure and an ion exchange device that can supply a stable regenerant solution.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that an annular elastic body having a hole through which a driving fluid passes and having a constant flow rate function is also used as a nozzle. It is a feature.

  According to the first aspect of the present invention, since the annular elastic body itself is also used as a nozzle, the driving pressure does not decrease on the upstream side of the nozzle, and the constant flow rate is reduced. That is, it is possible to prevent a decrease in the suction force of the ejector.

  The invention according to claim 2 is characterized in that an annular elastic body having a hole through which the driving fluid passes and having a constant flow rate function is provided in the vicinity of the upstream side of the nozzle.

  According to the second aspect of the present invention, since the nozzle is located at a position before the expansion (decompression) of the fluid flow is finished by the annular elastic body, a decrease in the driving head pressure is suppressed, and a constant flow rate function is achieved. The pressure head pressure, that is, the suction force of the ejector can be prevented from decreasing.

  Further, the invention described in claim 3 is characterized in that, in the ion exchange apparatus, the constant flow ejector of claim 1 or 2 is used as an ejector for sucking the regenerant stock solution.

  According to the third aspect of the present invention, in addition to the effect of the first or second aspect of the invention, the decrease in the pressurized head pressure in the constant flow ejector is prevented or suppressed, so that the stable and An efficient regeneration solution can be supplied.

  According to the present invention, it is possible to provide a constant flow rate ejector having a high suction force that prevents or suppresses a decrease in driving head pressure and pressurized head pressure, and an ion exchange device that can supply a stable regenerant solution. .

  An embodiment of the invention of the constant flow ejector will be described. The embodiment of the present invention is preferably implemented in an ion exchange device such as a soft water device.

(Embodiment 1)
Embodiment 1 of the present invention is characterized in that an annular elastic body that has a hole through which a driving fluid as a driving fluid passes and that exhibits a constant flow rate function is also used as a nozzle of an ejector.

  According to the first embodiment, the annular elastic body functions as an ejector nozzle. That is, the driving liquid is depressurized when passing through the hole, and a sucking liquid such as a regenerant stock solution is sucked by this depressurization. Further, the annular elastic body functions as a constant flow rate means by elastic deformation. In the first embodiment, since the pressure reduction for the constant flow rate and the pressure reduction for the suction action of the ejector occur at the same time, a decrease in the driving head pressure and the pressure head pressure due to the pressure reduction for the constant flow rate is prevented. It is possible to prevent a decrease in suction force due to a decrease in pressurized hydraulic head pressure as in the prior art.

  Next, components of the first embodiment will be described. The annular elastic body narrows the cross-sectional area of the driving liquid flow path when the driving liquid pressure (driving water pressure, hereinafter referred to as driving pressure) increases, and conversely when the driving pressure decreases, the driving liquid flow The shape and material are not limited to specific ones as long as it has a function of making the flow rate of the driving fluid constant with respect to fluctuations in the driving pressure by increasing the cross-sectional area of the path. The annular elastic body is formed with a hole through which the driving liquid passes at a substantially central portion thereof, and adjusts the cross-sectional area of the driving liquid channel by changing the diameter of the hole.

  The ejector of the first embodiment (same as the second embodiment described later) includes a main body having a drive liquid inlet and a discharge liquid discharge port, and a nozzle provided between the drive liquid inlet and the discharge port in the main body. The main body is provided with a suction port for suction liquid at a position where the suction liquid is sucked by the reduced pressure liquid flow by the nozzle portion. The driving liquid is usually water, but may be liquid other than water depending on the application. Further, the driving liquid can be a fluid other than the liquid. In the first embodiment, the annular elastic body for constant flow rate also serves as the nozzle.

(Embodiment 2)
The present invention is not limited to the first embodiment, but includes the following second embodiment. Embodiment 2 of the present invention is characterized in that an annular elastic body having a hole through which the driving liquid passes and having a constant flow rate function is provided in the vicinity of the upstream side of the nozzle.

The second embodiment is different from the first embodiment in that the annular elastic body is provided in the vicinity of the upstream side separately from the ejector nozzle. Here, “near the upstream side” means a position where the expansion of the driving liquid after passing through the hole of the annular elastic body does not end (decompression does not end).

  According to the second embodiment, since the nozzle is located at a position before the pressure reduction for the constant flow rate is completed, the driving head pressure and the pressure head pressure are reduced due to the pressure reduction for the constant flow rate. It is possible to suppress the decrease in the suction force due to the decrease in the pressurized hydraulic head pressure as in the prior art.

  The constant flow ejectors of the first embodiment and the second embodiment can be used as ejectors for sucking the regenerant stock solution of the ion exchange device. According to this ion exchange apparatus, the constant flow rate function can be exhibited by the constant flow rate ejector, and a decrease in suction force can be prevented or suppressed, so that the regenerant stock solution can be sucked stably and efficiently.

  The ion exchange device is preferably a soft water device, but is not limited thereto. The soft water device is not limited to regeneration methods such as counter flow regeneration and parallel flow regeneration, and various regeneration methods and structures are applicable.

  A constant flow ejector according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a longitudinal section of the first embodiment, FIG. 2 is an explanatory view of an essential part cross section for explaining an operation state of the first embodiment, and FIG. 3 is an operation of the first embodiment. It is a characteristic view explaining an effect.

  The ejector 1 according to the first embodiment includes a cylindrical main body 5 provided with a driving liquid inlet 2, a discharge liquid 3 of a discharge liquid (mixed liquid of a driving liquid and a suction liquid), and a suction opening 4 of a suction liquid. 5, a nozzle portion 6 provided between the driving liquid inlet 2 and the discharge port 3, and a mixing portion (which can be referred to as a throat portion) provided on the downstream side of the nozzle portion 6 and the suction port 4. And a diffusion portion (which can be referred to as a diffuser or an expansion tube) 8 formed integrally with the mixing portion 7 and the cylindrical body and provided on the downstream side of the mixing portion 7 as a main portion.

  The nozzle section 6 includes a cylindrical nozzle support 9 mounted in the main body 5 and an annular elastic body 11 that also serves as an ejector nozzle 10 mounted on the support 9. .

  The annular elastic body 11 has a hole 12 through which the driving liquid passes almost in the center. As shown in FIG. 2, the annular elastic body 11 has a partially reduced diameter of the hole 12 to narrow the cross-sectional area of the driving liquid flow path, as shown in FIG. When the pressure decreases, the diameter of the hole 12 increases, and elastic deformation is generated to widen the cross-sectional area of the driving liquid flow path. That is, it is configured to have a constant flow rate function that makes the flow rate of the drive fluid substantially constant with respect to fluctuations in the drive pressure.

  In the first embodiment, the annular elastic body 11 has a ring shape as shown in the figure and is made of rubber.

  The operation of the first embodiment will be described. The driving liquid flowing in from the driving liquid inlet 2 is depressurized when passing through the hole 12 of the annular elastic body 11. Due to the reduced pressure flow of the driving liquid, the suction liquid is sucked from the suction port 4, and the driving liquid and the suction liquid are mixed in the mixing unit 7 and discharged from the discharge port 3 through the diffusion unit 8. .

In addition to such an ejector function, in the first embodiment, the annular elastic body 11 functions as a constant flow rate means by elastic deformation. The constant flow rate function is realized by changing the diameter of the hole 12 by elastic deformation of the annular elastic body 11 as described above.

  The operation and effect of the first embodiment will be described based on FIG. 3 by comparison with a comparative example (corresponding to Patent Document 1) in which constant flow rate adjusting means is separately provided on the upstream side of the ejector 1. FIG. 3 shows an experimental result when the constant flow ejector 1 is used in a soft water device (shown in FIG. 10 described later), and this example 1 with respect to a change in driving pressure (kPa) upstream of the constant flow control means. And the change of the driving water amount (L / min) and the pressurized head pressure (kPa) and the change of the estimated salt concentration (wt%) of the comparative example are shown.

  The following can be understood from the experimental example of FIG. The amount of driving water is substantially the same in Example 1 and the comparative example, and the constant flow rate function of the annular elastic body 10 is exhibited as in the comparative example. On the other hand, the pressurized hydraulic head pressure indicating the suction force of the ejector shows a higher value in Example 1 than in the comparative example when compared at the same driving pressure, indicating that the salt water suction force is higher. Naturally, the estimated salt concentration of Example 1 is higher than that of Comparative Example 1. This effect indicates that the higher the driving pressure, the more prominent.

  As described above, according to the first embodiment, since the pressure reduction for the constant flow rate and the pressure reduction for the suction action of the ejector occur at the same time, the reduction of the driving head pressure due to the pressure reduction for the constant flow rate is prevented. It is possible to prevent a decrease in suction force due to a decrease in pressurized hydraulic head pressure as in the prior art.

  Next, a constant flow ejector according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an explanatory diagram of a longitudinal section of the second embodiment, and FIG. 5 is a characteristic diagram illustrating the operational effects of the second embodiment.

  The second embodiment is different from the first embodiment in that the annular elastic body 11 is provided separately from the nozzle 10 and is provided in the vicinity of the upstream side of the nozzle 10. A description thereof will be omitted.

  In FIG. 4, the nozzle 10 has a nozzle hole 13 formed in the center, and a cylindrical portion on the upstream side of the nozzle hole 13 serves as a support portion 14 for the annular elastic body 11. The position of the nozzle hole 13 is a position where the expansion of the driving liquid flow from the hole 12 of the annular elastic body 11 does not end (decompression does not end). As the position of the nozzle hole 13 is closer to the hole 12 of the annular elastic body 11, the decrease in pressurized head pressure can be reduced. The positional relationship between the annular elastic body 11 and the nozzle 10 may be any relationship as long as they do not interfere with each other.

  As in Example 1, this Example 2 was also tested by comparison with the comparative example, and it was confirmed that the decrease in the pressurized head pressure was suppressed. FIG. 5 shows the experimental results when the constant flow ejector 1 is used in a soft water device, the change in driving water amount (L / min) in Example 1 and the comparative example with respect to the change in driving pressure (kPa), and the estimated salt. It shows the change in concentration (wt%).

  The following can be understood from the experimental example of FIG. Although the amount of driving water is slightly smaller in Example 1 than in the comparative example, the constant flow rate function of the annular elastic body 11 is exhibited. On the other hand, the estimated salt concentration that indirectly indicates the suction force of the ejector has a higher value in Example 1 than in the comparative example when compared at the same driving pressure, indicating that the salt water suction force is higher. This effect indicates that the higher the driving pressure, the more prominent.

(Modification of Examples 1 and 2)
The present invention is not limited to the first and second embodiments, and each component of the quantitative ejector can be variously modified without departing from the present invention. For example, the shape of the annular elastic body 11 can be changed as shown in FIGS. An annular elastic body 11 shown in FIGS. 6 and 7 is formed by forming the inlet side of the hole 12 in an R shape (rounded without being squared). The annular elastic body 11 is deformed by the differential pressure between the upstream pressure and the downstream pressure, and as a result, the diameter of the hole 12 changes to adjust the flow rate. 6 and 7, the change in the diameter of the hole 12 can be reduced, and the flow rate adjusting ability can be changed.

  Moreover, the shape of the said annular elastic body 11 can be comprised like FIG. 8 and FIG. An annular elastic body 11 shown in FIGS. 8 and 9 is formed by forming an annular protrusion 14 on the inlet side of the hole 12 and forming the inlet of the hole 12 in an R shape. By setting it as such a shape, the deformation amount of the said annular elastic body 11 can be enlarged, and flow volume adjustment capability can be changed.

(Application example of Examples 1 and 2 to ion exchange apparatus)
The said Example 1, 2 is used suitably for ion exchange apparatuses, such as a soft water apparatus. For example, the present invention is applied to the ion exchange device 21 shown in FIG. Of course, the first and second embodiments can be applied to an ion exchange apparatus using an ejector other than that shown in FIG. 10 and other apparatuses. Hereinafter, the ion exchange apparatus 21 of FIG. 10 is demonstrated easily.

  In FIG. 10, the ion exchange device 21 mainly includes a resin container 22, a control valve unit 23, and a regenerant tank 24. The resin container 22 includes a resin cylinder 27 filled with silica stone 25 as a support material and cation exchange resin 26 as a treatment material in this order from below, and the opening of the resin cylinder 27 has a lid. It is closed with a member 28. The lid member 28 is provided with the control valve unit 23, and a command signal from a controller (not shown) is used for the flow path of the water exchange operation and the flow path of the regeneration operation of the ion exchange device 21. It is comprised so that it can switch by.

  The lid member 28 is formed with an inflow passage (not shown) for guiding raw water into the resin cylinder 27, and a raw water line 29 is connected to the inlet of the inflow passage through the control valve unit 23. Has been. That is, a part of the raw water line 29 is formed in the control valve unit 23. On the other hand, the outlet of the inflow path is opened into the resin cylinder 27.

  Further, the lid member 28 is formed with an outflow passage (not shown) for guiding the soft water, which is treated water, to the outside of the resin tube 27, and the inlet of the outflow passage is connected to the bottom of the resin tube 27. An extending water collecting pipe 30 is connected. A first screen member 31 that prevents the cation exchange resin 26 from flowing out to the treated water side is attached to the tip of the water collecting pipe 30. On the other hand, a treated water line 32 is connected to the outlet of the outflow passage via the control valve unit 23. That is, a part of the treated water line 32 is formed in the control valve unit 23.

  The raw water line 29 is provided with a strainer 33 and a first opening / closing valve 34 in order from the upstream side, and the first opening / closing valve 34 constitutes the control valve unit 23. The treated water line 32 is provided with a second opening / closing valve 35, and the second opening / closing valve 35 constitutes the control valve unit 23.

Here, the configuration of the control valve unit 23 will be described in more detail. In the control valve unit 23, the raw water line 29 on the upstream side of the first on-off valve 34 is connected to the treated water line 35 on the downstream side of the second on-off valve 35 by a bypass line 36. A third open / close valve 37 is provided in the bypass line 36. The bypass line 36 on the upstream side of the third on-off valve 37 is connected to the raw water line 29 on the downstream side of the first on-off valve 34 by a regenerated liquid preparation line 38. The regeneration solution preparation line 38 is provided with a fourth on-off valve 39 and a constant flow rate ejector 1 in order from the bypass line 36 side. Here, the ejector 1 has a nozzle 10 for rapidly reducing the cross-sectional area in the flow direction.

  The discharge port 3 of the ejector 1 is connected to a float valve unit 43 disposed in the regenerant tank 24 by a regenerant supply line 44, and the regenerant supply line 44 includes a fifth on-off valve 45. Is provided. That is, the ejector 1 uses a negative pressure generated when raw water as driving water is discharged from the nozzle 10, so that a regenerant stock solution (for example, a saturated aqueous solution of sodium chloride) in the regenerant tank 24 is used. It is configured to be suckable. In the ejector 1, the regenerant stock solution from the regenerant tank 24 is diluted with raw water to a predetermined concentration (for example, 8 to 12% by weight).

  The regenerant tank 24 is a tank for preparing a regenerant stock solution used for the regeneration of the cation exchange resin 26, and contains a solid salt 46 (for example, granular or pellet-like chloride) as a regenerant. Sodium) is stored. The solid salt 46 is dissolved by bringing it into contact with the raw water replenished in the regenerant tank 24 via the regenerant supply line 44 to generate a regenerant stock solution.

  When the raw water is replenished into the regenerant agent tank 24 via the regenerant supply line 44, the float valve unit 43 moves up the valve body 48 interlocked with the float 47 and blocks the inflow of the raw water at a predetermined water level. Operates to On the contrary, the float valve unit 43 operates so that when the inside of the ejector 1 becomes negative pressure, the valve body 48 interlocked with the float 47 descends and the regenerant stock solution flows out to the regenerant supply line 44. To do. Then, when the regenerant stock solution in the regenerant tank 24 is consumed to a predetermined water level, the hollow ball 49 built in the float valve unit 23 moves to the opening of the regenerant supply line 44 and the regenerant stock solution. Shut off air suction.

  A first drain line 50 extending to the outside of the control valve unit 23 is connected to the treated water line 32 upstream of the second opening / closing valve 35. The first drain line 50 is provided with a sixth on-off valve 51. The raw water line 29 on the downstream side of the first on-off valve 34 is connected to the first drain line 50 and the second drain line 52 on the downstream side of the sixth on-off valve 51. The second drainage line 52 is provided with a seventh on-off valve 53 and an orifice 54 in order from the raw water line 29 side. Here, the orifice 54 is for adjusting the backwash water drained from the resin cylinder 27 to a flow rate within a predetermined range.

The regeneration process of the ion exchange device 21 is performed as follows. In the regeneration step, the third on-off valve 37, the fourth on-off valve 39, the fifth on-off valve 45, and the sixth on-off valve 51 are each set to an open state by a command signal from the controller. . On the other hand, the first on-off valve 34, the second on-off valve 35, and the seventh on-off valve 53 are each set to a closed state. The raw water flowing through the raw water line 29 is supplied as dilution water (driving water) to the primary side of the ejector 1 through the bypass line 36 and the regenerated liquid preparation line 38. In the ejector 1, when a negative pressure is generated on the discharge side of the nozzle 10, the inside of the regenerant supply line 44 also becomes a negative pressure, and the valve body 48 interlocked with the float 47 is lowered. As a result, the regenerant stock solution in the regenerant tank 24 can be sucked through the regenerant supply line 44, and in the ejector 1, the regenerant stock solution is diluted with raw water to a predetermined concentration to prepare a regenerant solution. The The regenerated liquid from the ejector 1 is supplied to the upper part in the resin cylinder 27 through the regenerated liquid preparation line 38 and a part of the raw water line 29. This regenerated liquid passes through the packed bed of the cation exchange resin 26 in a downward flow, and regenerates the cation exchange resin 26.
That is, co-flow regeneration is performed on the packed bed of the cation exchange resin 26. The regenerated liquid that has passed through the packed bed of the cation exchange resin 26 is discharged from the resin cylinder 27 through the first screen member 31 and the water collecting pipe 30, and then the treated water line 32 and the It is discharged out of the system through the first drain line 50. Here, when the regenerant stock solution in the regenerant tank 24 is consumed up to a predetermined water level, the hollow ball 49 moves to the opening of the regenerant supply line 44 to block the suction of the regenerant stock solution and air. .

  According to the ion exchange device 21, since the constant flow ejector 1 is used, it is possible to prevent or suppress a decrease in suction force while the constant flow ejector 1 exhibits a constant flow function. Therefore, a constant flow rate and a high pressurized hydraulic head pressure can be maintained regardless of fluctuations in the driving pressure, so that the regenerant stock solution can be sucked stably and efficiently.

It is explanatory drawing of the longitudinal cross-section of Example 1 of this invention. It is a figure explaining the operation | movement of the Example 1. FIG. It is a figure explaining the effect of Example 1. It is explanatory drawing of the longitudinal cross-section of Example 2 of this invention. It is a figure explaining the effect of the Example 2. FIG. It is explanatory drawing of the side which shows the modification of a cyclic | annular elastic body. It is explanatory drawing of the longitudinal cross-section which shows the modification of a cyclic | annular elastic body. It is explanatory drawing of the longitudinal cross-section which shows the other modification of a cyclic | annular elastic body. It is explanatory drawing of the longitudinal cross-section which shows the other modification of a cyclic | annular elastic body. It is explanatory drawing of the outline of the ion exchange apparatus which implemented this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Constant flow ejector 2 Driving liquid inlet 3 Discharge port 4 Suction port 10 Nozzle 11 Annular elastic body 21 Ion exchange device

Claims (3)

  A constant flow ejector characterized in that an annular elastic body having a hole through which a driving fluid passes and having a constant flow rate function is also used as a nozzle.   A constant flow ejector comprising an annular elastic body in the vicinity of the upstream side of a nozzle having a hole through which a driving fluid passes and having a constant flow control function.   An ion exchange apparatus, wherein the constant flow ejector according to claim 1 or 2 is used as an ejector for sucking a regenerant stock solution.

Images