Water flow electrification device

Abstract

The invention provides a water flow charging device capable of reducing the usage amount of fresh water. A water flow charging device (10) is a device for charging a non-conductive sheet (90) by supplying water to the sheet (90). A water flow charging device (10) is provided with: a supply unit (20) that supplies water toward a sheet (90); a circulation flow path (30) that circulates the water supplied to the sheet (90) to the supply unit (20); and a cooling device (60) that is provided in the middle of the circulation flow path (30) and cools water.

Description

Technical Field

[0001] The invention relates to a water current electrification device. Background Art

[0002] Patent Document 1 describes a manufacturing apparatus for manufacturing an electret workpiece by electretizing a non-conductive sheet made of a fibrous material.

[0003] The manufacturing device described in Patent Document 1 includes: a water applying mechanism that applies water to one side of a sheet; and a suction nozzle that is arranged on the opposite side of the water applying mechanism across the sheet and sucks the water applied to the one side of the sheet. The water applied to the sheet is sucked by the suction nozzle and moves from the one side of the sheet through the inside of the sheet to the other side of the sheet, and the friction between the water and the sheet is used to charge the sheet. In addition, the water sucked by the suction nozzle is discharged to the outside of the manufacturing device.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2018 / 062237 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in conventional manufacturing apparatuses including Patent Document 1, new water such as tap water is discharged through a water supply mechanism and a suction nozzle, and therefore there is a problem that the amount of new water used increases.

[0009] Solutions to Solve Problems

[0010] A water charging device for solving the above-mentioned problem charges a non-conductive object by supplying water to the object, wherein the water charging device comprises: a supply unit that supplies water toward the object; a circulation path that circulates the water supplied to the object toward the supply unit; and a cooling device that is disposed in the middle of the circulation path and cools the water.

[0011] According to this configuration, water supplied from the supply unit to the object is circulated to the supply unit through the circulation flow path, thereby making it possible to reuse the water. This can reduce the amount of new water used.

[0012] However, when water flows in the circulation flow path, the water temperature rises due to the heat from the pipes constituting the circulation flow path, the frictional heat between the pipes, etc. As the water temperature rises, the conductivity of the water supplied from the supply unit increases. Therefore, the charge of the charged object is easily transferred to the water, and the degree of charge of the object may be reduced.

[0013] In this regard, according to the above structure, the water can be cooled by a cooling device provided in the middle of the circulation flow path. Therefore, the temperature rise of the water flowing in the circulation flow path can be suppressed, so the increase in the conductivity of the water can be suppressed. Thus, the charge of the charged object can be suppressed from moving to the water, and the degree of charge of the object can be suppressed from decreasing. Therefore, the amount of new water used can be appropriately reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram showing a schematic structure of a water current electrification device according to one embodiment.

[0015] Figure 2 It is a graph showing the relationship between water temperature and water conductivity.

[0016] Figure 3 This is a graph showing the relationship between the temperature of water supplied to the nonwoven fabric sheet and the dust collecting efficiency of the nonwoven fabric sheet. DETAILED DESCRIPTION

[0017] Below, refer to Figure 1 to Figure 3 An embodiment of the water electrification device will be described.

[0018] like Figure 1 As shown, the water current charging device 10 is a device for charging the non-conductive sheet 90 by supplying water to the sheet 90 .

[0019] The sheet material 90 is a nonwoven fabric sheet material made of synthetic resin.

[0020] The water flow electrification device 10 includes a conveying device 11 , a supply unit 20 , a suction unit 31 , and a circulation flow path 30 .

[0021] <Conveying device 11>

[0022] like Figure 1 As shown, the conveying device 11 conveys the sheet 90. The conveying device 11 includes: a mesh-shaped endless belt 12 having a conveying surface 12a for conveying the sheet 90; and a plurality of rollers 13 for supporting the endless belt 12 so as to be movable in the conveying direction.

[0023] <Supply section 20>

[0024] like Figure 1 As shown, the supply unit 20 supplies water toward the sheet 90 , and is disposed above the conveying device 11 .

[0025] The supply unit 20 includes a flow path unit 21 and a jet port 22 that is located at a lower end of the flow path unit 21 and jets water toward the sheet 90 .

[0026] <Suction section 31>

[0027] like Figure 1 As shown, the suction unit 31 has a suction port for sucking water falling through the endless belt 12 , and the suction unit 31 is arranged below the endless belt 12 .

[0028] <Circulation channel 30>

[0029] like Figure 1 As shown, the circulation flow path 30 circulates the water supplied to the sheet 90 toward the supply unit 20 , and connects the suction unit 31 to the supply unit 20 .

[0030] In addition, in the following description, the upstream side and the downstream side in the flow direction of the water flowing in the circulation flow path 30 are simply referred to as the upstream side and the downstream side, respectively.

[0031] In the circulation flow path 30 , a gas-liquid separator 40 , a first filter 50 , an introduction unit 55 , a cooling device 60 , an ion exchanger 70 , and a second filter 80 are provided in order from the upstream side.

[0032] In the circulation flow path 30 , a first pump 32 for pressure-feeding cooling water toward the downstream side is provided between the first filter device 50 and the cooling device 60 .

[0033] In addition, in the circulation flow path 30 , a second pump 33 for pressure-feeding the cooling water toward the downstream side is provided between the second filter device 80 and the supply unit 20 .

[0034] (Gas-Liquid Separation Device 40)

[0035] The gas-liquid separation device 40 includes: a storage tank 41 for temporarily storing water sucked by the suction unit 31 ; a discharge flow path 42 for discharging air (hereinafter referred to as exhaust gas) in the storage tank 41 ; and a blower 43 provided in the middle of the discharge flow path 42 .

[0036] A muffler 44 for eliminating exhaust sound is provided on the downstream side of the blower 43 in the exhaust flow direction in the exhaust flow path 42 .

[0037] The blower 43 sucks the exhaust gas in the storage tank 41 to make the interior of the storage tank 41 a negative pressure, and uses the negative pressure to suck water toward the storage tank 41 through the suction unit 31 .

[0038] In addition, the water that has flowed into the muffler 44 together with the exhaust gas is stored in the muffler 44 and discharged to the outside through a drain portion (not shown) connected to the muffler 44 .

[0039] (First Filter Device 50)

[0040] The first filter device 50 collects foreign matter such as lint contained in the water flowing in the circulation flow path 30. The first filter device 50 includes a filter 51 and a switching valve 52 provided on the upstream side of the filter 51.

[0041] In the present embodiment, the two systems of the first filter devices 50 are arranged in parallel, and the first filter device 50 to be used can be switched by opening and closing the switching valve 52 during maintenance or the like.

[0042] (Introduction section 55)

[0043] The introduction unit 55 introduces tap water into the circulation flow path 30. The introduction unit 55 includes a pipe 56 connected to a portion of the circulation flow path 30 between the first filter device 50 and the first pump 32, and a valve 57 that switches between allowing and prohibiting the introduction of tap water through the pipe 56.

[0044] (Cooling device 60)

[0045] The cooling device 60 cools the water in the circulation flow path 30. The cooling device 60 includes: a tank 61 that temporarily stores the water flowing in the circulation flow path 30; a heat exchanger 62 that performs heat exchange with the refrigerant piping through which the refrigerant circulates; and a cooling pump 63 that pressurizes a portion of the water in the tank 61 toward the heat exchanger 62. In the heat exchanger 62, the water is cooled by heat exchange between the water and the refrigerant circulating in the refrigerant piping. The water that has passed through the heat exchanger 62 is led out to the circulation flow path 30.

[0046] The cooling device 60 includes a control unit 64 that controls the driving method of the cooling pump 63 , and a temperature sensor 65 that detects the temperature of the water output from the heat exchanger 62 .

[0047] The control unit 64 controls the driving mode of the cooling pump 63 so that the water temperature detected by the temperature sensor 65 becomes equal to or lower than the target temperature. In addition, the target temperature in this embodiment is 15 degrees Celsius.

[0048] (Ion exchanger 70)

[0049] The ion exchanger 70 removes ions contained in the water flowing in the circulation flow path 30 by ion exchange, and includes a well-known ion exchange resin.

[0050] (Second Filter Device 80)

[0051] The second filter device 80 collects foreign matter contained in the water flowing in the circulation flow path 30 , and includes a filter 81 and a switching valve 82 provided on the upstream side of the filter 81 .

[0052] In the present embodiment, two systems of second filter devices 80 are arranged in parallel, and the second filter device 80 to be used can be switched by opening and closing the switching valve 82 during maintenance or the like.

[0053] In the water flow charging device 10 of the present embodiment, although water circulates in the circulation flow path 30, a small amount of water is discharged from the muffler 44 of the gas-liquid separation device 40. Therefore, in the present embodiment, a water level sensor 66 for detecting the water level in the tank 61 of the cooling device 60 is provided, and based on the water level detected by the water level sensor 66, tap water can be added to the circulation flow path 30 through the introduction portion 55.

[0054] Next, the operation of this embodiment will be described.

[0055] like Figure 1 As shown, water supplied from the supply unit 20 to the sheet 90 can be reused by circulating the water to the supply unit 20 through the circulation flow path 30. This can reduce the amount of new water used.

[0056] However, when water flows in the circulation flow path 30 , the temperature of the water rises due to heat received from the pipes constituting the circulation flow path 30 , frictional heat acting between the pipes, and the like.

[0057] Here, in Figure 2 The relationship between the temperature of water and the electrical conductivity of water is shown in FIG.

[0058] like Figure 2 As shown, the conductivity of the water supplied from the supply unit 20 increases due to the increase in the temperature of the water. Therefore, the charge of the charged sheet 90 is easily transferred to the water, and the degree of charge of the sheet 90 may be reduced.

[0059] exist Figure 3 2 shows the relationship between the temperature of water supplied from the supply unit 20 to the sheet 90 and the dust collecting efficiency of the filter element formed by the sheet 90 .

[0060] like Figure 3 As shown, the higher the temperature of the water, the lower the dust collection efficiency, that is, the lower the degree of charge of the sheet 90.

[0061] According to the present embodiment, the water can be cooled by the cooling device 60 provided in the middle of the circulation flow path 30. Therefore, since the temperature rise of the water flowing in the circulation flow path 30 can be suppressed, the increase in the conductivity of the water can be suppressed. Thus, the charge of the charged sheet 90 can be suppressed from moving to the water, and the degree of charge of the sheet 90 can be suppressed from decreasing.

[0062] Next, the effects of this embodiment will be described.

[0063] (1) The water flow electrification device 10 includes the cooling device 60 , which is provided in the middle of the circulation flow path 30 and cools water.

[0064] According to such a configuration, the above-mentioned effect can be achieved, and therefore the amount of new water used can be appropriately reduced.

[0065] (2) The water flow electrification device 10 includes an introduction portion 55 and an ion exchanger 70. The introduction portion 55 introduces tap water into the circulation flow path 30. The ion exchanger 70 is provided in the middle of the circulation flow path 30 and removes ions contained in the water by ion exchange.

[0066] Since water adheres to the sheet 90 or part of the water supplied to the sheet 90 from the supply unit 20 is discharged to the outside, the amount of water flowing in the circulation path 30 is insufficient. Therefore, in order to supplement the insufficient water, tap water is introduced into the circulation path 30 as new water, for example. However, tap water contains ions such as calcium ions and chloride ions. In addition, metal ions are sometimes dissolved into the water from the inner surface of the pipe constituting the circulation path 30. Therefore, since the concentration of ions contained in the water supplied from the supply unit 20 to the sheet 90 increases, the conductivity of the water supplied from the supply unit 20 increases. As a result, the charge of the charged sheet 90 is easily transferred to the water, and the degree of charge of the sheet 90 may be reduced.

[0067] In this regard, according to the above configuration, by providing the ion exchanger 70 in the middle of the circulation flow path 30, ions contained in the water flowing in the circulation flow path 30 can be removed by ion exchange. Therefore, it is possible to suppress the increase in the conductivity of the water caused by the introduction of tap water from the introduction portion 55 or the dissolution of metal ions into the water from the pipe constituting the circulation flow path 30. Therefore, it is possible to stably suppress the decrease in the degree of charge of the sheet 90 for a long period of time.

[0068] (3) The ion exchanger 70 is provided on the downstream side of the cooling device 60 .

[0069] According to such a structure, the ion exchanger 70 is arranged on the downstream side of the cooling device 60, so that in the circulation flow path 30, the ion exchanger 70 is arranged at a position closer to the supply unit 20 than the cooling device 60. Therefore, the ions contained in the water can be removed in the portion between the cooling device 60 and the supply unit 20 in the circulation flow path 30. As a result, compared with the case where the ion exchanger 70 is arranged on the upstream side of the cooling device 60, the concentration of ions contained in the water supplied from the supply unit 20 to the sheet 90 can be reduced, so the increase in the electrical conductivity of the water can be suppressed. Therefore, the reduction in the degree of charge of the sheet 90 can be further suppressed.

[0070] <Change Example>

[0071] This embodiment can be implemented by being modified as follows. This embodiment and the following modified examples can be implemented in combination with each other within the range that there is no technical contradiction.

[0072] The object according to the present invention is not limited to the nonwoven fabric sheet 90 , and may be, for example, a woven or knitted fabric sheet made of synthetic resin fibers.

[0073] In the present embodiment, the ion exchanger 70 is provided on the downstream side of the cooling device 60 , but the ion exchanger 70 may be provided between the first pump 32 and the cooling device 60 .

[0074] The ion exchanger 70 may be omitted. In this case, ion exchange water or pure water may be introduced instead of tap water.

[0075] In the cooling device 60 of the present embodiment, the water is cooled to the target temperature by controlling the driving method of the cooling pump 63 , but the water may be cooled to the target temperature by other well-known methods.

[0076] Description of Reference Numerals

[0077] 10…Water current charging device

[0078] 11…Conveying device

[0079] 12…Annular belt

[0080] 12a…Conveying surface

[0081] 13…Roller

[0082] 20…Supply Department

[0083] 21...Flow path part

[0084] 22…Injection port

[0085] 30…Circulation path

[0086] 31…Attraction

[0087] 32…First Pump

[0088] 33…2nd pump

[0089] 40…Gas-liquid separation device

[0090] 41…Storage box

[0091] 42…Discharge flow path

[0092] 43…Blower

[0093] 44…Silencer

[0094] 50…First filter device

[0095] 51…Filter

[0096] 52…Switch valve

[0097] 55…Introduction

[0098] 56…Piping

[0099] 57…Valve

[0100] 60…Cooling device

[0101] 61…Box

[0102] 62…Heat exchanger

[0103] 63…Cooling pump

[0104] 64…Control Department

[0105] 65…Temperature sensor

[0106] 66…Water level sensor

[0107] 70…Ion exchanger

[0108] 80…Second filter device

[0109] 81…Filter

[0110] 82…Switch valve

[0111] 90…sheet

Claims

1. A water current charging device for charging a non-conductive object by supplying water to the object, wherein: The water current charging device comprises: a supply unit that supplies water toward the object; a circulation flow path that circulates water supplied to the object toward the supply unit; and A cooling device is provided in the middle of the circulation flow path and cools the water.

2. The water current charging device according to claim 1, wherein: The water current charging device also has: an introduction unit for introducing tap water into the circulation flow path; and The ion exchanger is provided in the middle of the circulation flow path and removes ions contained in the water by ion exchange.

3. The water current charging device according to claim 2, wherein: The ion exchanger is provided on the downstream side of the cooling device in the flow direction of the water flowing in the circulation flow path.

4. The water current charging device according to any one of claims 1 to 3, wherein: The object is a nonwoven fabric sheet.

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