Chemical injection device

Abstract

To provide a liquid chemical injector capable of detecting a residual amount of a liquid chemical.SOLUTION: A liquid chemical injector 1 is assembled with: a liquid chemical tank 12 for retention of a liquid chemical; a volume pump 41 for injection of a liquid chemical retained in the liquid chemical tank 12 to an injection target; and a control unit 58 which drives the volume pump 41 as well as calculates a liquid chemical residual amount in the liquid chemical tank 12 by integrating a stroke number of the volume pump 41 from setting of the liquid chemical amount in the liquid chemical tank 12, multiplying an injection amount of the liquid chemical per one stroke to the integrated stroke number to calculate an integrated injection amount, and subtracting the integrated injection amount from a set liquid chemical amount in the liquid chemical tank 12.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a chemical liquid injector that injects a chemical liquid. [Background technology]

[0002] Chemical injection devices that inject chemical liquid into water are known. Chemical injection devices use a pump to inject chemical liquid stored in a chemical tank into piping, etc. A known technology for such chemical injection devices is to use a float switch-type water level detection device to detect the remaining amount of chemical liquid in the chemical tank. Most float switch-type water level detection devices are inexpensive and detect an ON / OFF signal at a fixed water level. For example, float switch-type water level detection devices that are capable of multi-point output have a complex structure consisting of multiple floats and stoppers with built-in magnets, which inevitably makes them expensive.

[0003] Another known continuous water level detector is an electrode-type water level detector. With an electrode-type water level detector, if the electrode length is known, the current flowing between the electrodes can be converted into a voltage value, and the electrode immersion length can be calculated to achieve continuous detection. However, when used with highly corrosive chemicals, electrodes made of titanium, a highly corrosion-resistant material, must be used, which tends to make the water level detector expensive.

[0004] On the other hand, when using vaporizable liquid chemicals such as sodium hypochlorite, there is a problem in that bubbles generated by electrolysis adhere to the electrodes, changing the electrode surface area and causing fluctuations in the value of the current flowing between the electrodes.

[0005] Additionally, ultrasonic water level sensors that do not come into contact with the chemical solution are commercially available, but because the ultrasonic sensor is exposed to the atmosphere, corrosion-resistant ceramic sensors are expensive, and measures to prevent echoes are required when installing the sensor inside the tank, so the software used to process the data also requires a high level of expertise.

[0006] Therefore, a chemical liquid injector capable of detecting the chemical liquid level inexpensively and easily is also known (see, for example, Patent Document 1). Such a chemical liquid injector has an exhaust tube with an open end along the side of the chemical liquid tank, and has, nearby, a chemical liquid level scale that allows the chemical liquid level in the exhaust tube to be visually confirmed, and an injection amount scale that allows the discharge amount to be measured when the on-off valve is closed and the chemical liquid injector is operated. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-35242 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the chemical liquid injection device in Patent Document 1 does not convert the chemical liquid water level into an electrical signal for display, nor is it able to detect the chemical liquid water level and output a water level signal to the outside. In particular, in recent years, chemical liquid injection devices are expected to be equipped with a communication function in the control unit that controls the pump, and to have the function of transmitting water level information and drought warnings to communication devices carried by maintenance contractors.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a liquid medicine injector that can detect the remaining amount of liquid medicine. [Means for solving the problem]

[0010] According to one aspect of the present invention, a chemical liquid injector includes: a chemical liquid tank that stores a chemical liquid; a volumetric pump that injects the chemical liquid stored in the chemical liquid tank into an injection destination; and a control unit that drives the volumetric pump and accumulates the number of strokes of the volumetric pump since an amount of chemical liquid in the chemical liquid tank was set, calculates an accumulated injection amount by multiplying the accumulated number of strokes by an injection amount of the chemical liquid per stroke, and calculates a remaining amount of chemical liquid in the chemical liquid tank by subtracting the accumulated injection amount from the set amount of chemical liquid in the chemical liquid tank. The control unit corrects the injection amount of the medicinal liquid per stroke of the volumetric pump according to the total number of strokes of the volumetric pump. . [Effects of the Invention]

[0011] The present invention can provide a chemical liquid injector that can detect the remaining amount of chemical liquid. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an explanatory diagram schematically illustrating the configuration of a water treatment device using a chemical liquid injector according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the configuration of the chemical liquid injector, partially in cross section. [Figure 3] FIG. 2 is a block diagram showing the configuration of an electrical box of the liquid chemical injector. [Figure 4] 4 is a flowchart showing an example of control of the chemical liquid injector. [Figure 5] FIG. 4 is an explanatory diagram showing an example of correction data stored in a storage unit of the electrical equipment box. [Figure 6] FIG. 4 is an explanatory diagram showing an example of correction data stored in a storage unit of the electrical equipment box. [Figure 7] FIG. 2 is an explanatory diagram showing an example of use of the chemical liquid injector. [Figure 8] FIG. 2 is an explanatory diagram showing an example of use of the chemical liquid injector. [Figure 9] FIG. 10 is an explanatory diagram schematically illustrating the configuration of a water treatment device using a chemical liquid injector according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] A chemical liquid injector 1 according to one embodiment of the present invention and a water treatment device 100 using the chemical liquid injector 1 will be described below with reference to FIGS.

[0014] FIG. 1 is an explanatory diagram schematically illustrating the configuration of a water treatment device 100 according to one embodiment of the present invention. FIG. 2 is a front view, partially in cross section, illustrating the configuration of a chemical liquid injector 1 used in the water treatment device 100. FIG. 3 is a block diagram illustrating the configuration of an electrical equipment box 19 of the chemical liquid injector 1. FIG. 4 is a flowchart illustrating an example of control of the chemical liquid injector 1. FIG. 5 is an explanatory diagram illustrating an example of correction data stored in the memory unit 55 of the electrical equipment box 19 for the amount of chemical liquid injected per stroke of the volumetric pump 41 according to the pressure. FIG. 6 is an explanatory diagram illustrating an example of correction data stored in the memory unit 55 of the electrical equipment box 19 for the amount of chemical liquid injected per stroke of the volumetric pump 41 according to the total number of strokes of the volumetric pump 41. FIGS. 7 and 8 are explanatory diagrams illustrating an example of how the chemical liquid injector 1 is used. Note that, for ease of explanation, the configurations in each drawing are enlarged, reduced, or omitted as appropriate.

[0015] As shown in FIG. 1, water treatment device 100 includes chemical liquid injection device 1 and water supply device 2 that supplies water to chemical liquid injection device 1. Water treatment device 100 supplies raw water from a water source 101, such as a well, to a water supply destination via water supply device 2, and treats the raw water by injecting a chemical liquid into the raw water via chemical liquid injection device 1. The water supply destination can be set in various ways depending on the application, such as a filtration device that removes iron and manganese from well water, a water tank that stores well water, or a water tap for a shower or the like. In this embodiment, water treatment device 100 has a filtration device 3, and will be described using an example in which raw water is treated with sterilization and iron and manganese removal.

[0016] 1 and 2, chemical liquid injection device 1 includes a stand 11, a chemical liquid tank 12, a piping unit 13, a chemical liquid injector 14, a connecting pipe 15, a pressure sensor 16, a flow rate sensor 17, and an electrical box 19. Chemical liquid injection device 1 is connected on the primary side to a water supply device 2 and on the secondary side to a filtration device 3. Chemical liquid injection device 1 injects a predetermined amount of, for example, sodium hypochlorite as an aerated liquid into water flowing through connecting pipe 15, thereby sterilizing the water supplied from water supply device 2 and precipitating iron and manganese contained in the water.

[0017] The base 11 supports the liquid chemical tank 12, the liquid chemical injector 14, the connecting pipe 15, and the electrical box 19. For example, the base 11 supports the liquid chemical tank 12 at a position higher than the liquid chemical injector 14. As a specific example, as shown in Fig. 2, the base 11 includes legs 11a to be placed on an installation surface, a first base 11b, a wall 11c, and a second base 11d. For example, the legs 11a, the first base 11b, the wall 11c, and the second base 11d are integrally formed.

[0018] Leg 11a is placed on the installation surface of chemical liquid injector 1. First base 11b is provided integrally on leg 11a. Connecting pipe 15 is placed on the upper surface of first base 11b so as to be able to be fixed thereto.

[0019] The wall portion 11c is provided, for example, at an upper portion of the first base 11b in the depth direction of the first base 11b. The wall portion 11c is formed, for example, in the shape of a rectangular frame or plate that extends upward from the first base 11b and is continuous with the second base 11d.

[0020] For example, liquid injector 14 is fixed to the center of wall 11c. Wall 11c is formed so that liquid injector 14 can be fixed thereto by a fastening member such as a bolt or a screw.

[0021] The second base 11d is provided on the upper edge of the wall portion 11c, and is formed so that the chemical liquid tank 12 can be fixed on the upper surface thereof.

[0022] First base 11b and second base 11d are connected by wall portion 11c, and the upper surface of second base 11d is located higher than the upper surface of first base 11b. The upper surface of second base 11d is also located higher than liquid medicine injector 14 provided on wall portion 11c.

[0023] The chemical tank 12 is made of a resin material and is configured to be able to store a predetermined amount of chemical liquid therein. The chemical tank 12 is fixed to the upper surface of the second base 11d. The chemical tank 12 has a piping unit 13 connected to a part of its bottom 12a. The chemical tank 12 has a supply port 12b at its top for supplying the chemical liquid to the inside, and a lid 12c for covering the supply port 12b.

[0024] Piping unit 13 fluidly connects chemical tank 12 and chemical injector 14. Piping unit 13 forms a flow path for the chemical from inside chemical tank 12 to chemical injector 14. As a specific example, as shown in FIG. 2 , piping unit 13 includes connection piping 21, exhaust tube 22, connecting piping 23, and on-off valve 24.

[0025] One end of the connection pipe 21 is connected to the chemical tank 12, and the other end branches in two directions to be connected to the exhaust tube 22 and the connecting pipe 23. Specifically, the connection pipe 21 is a bent pipe formed by bending in an L shape. The connection pipe 21 has a threaded portion 31, a flange 32, and a nut 33 at one end connected to the chemical tank 12. The other end of the connection pipe 21 has an upper branch portion 34 and a lower branch portion 35 that branch in two directions, upward and downward. The connection pipe 21 also has an attachment portion 36 for the on-off valve 24 formed at the bent portion.

[0026] The threaded portion 31 is formed on one end of the connection pipe 21. The threaded portion 31 is a male screw formed on the outer surface of one end of the connection pipe 21. The threaded portion 31 is inserted into the chemical tank 12 through a hole formed in the bottom portion 12a of the chemical tank 12. The flange 32 abuts against the lower surface of the bottom portion 12a of the chemical tank 12 when the threaded portion 31 is inserted through the hole in the bottom portion 12a. The flange 32 is also formed so that a packing can be attached to the abutting surface of the flange 32 that abuts against the lower surface of the bottom portion 12a of the chemical tank 12.

[0027] The nut 33 is threadedly engaged with the threaded portion 31. When the nut 33 is fastened to the threaded portion 31 inside the chemical tank 12, the flange 32 and the nut 33 are fixed to the bottom portion 12a of the chemical tank 12.

[0028] The exhaust tube 22 is a transparent tube or a tube through which the chemical solution can be seen, one end of which is connected to the upper branch portion 34. The other end of the exhaust tube 22 is open to the atmosphere. The exhaust tube 22 constitutes, for example, a water level indicator formed so that the level of the chemical solution inside the exhaust tube 22 can be seen visually.

[0029] As a specific example, the exhaust tube 22 is fixed to the chemical tank 12, extending upward from the upper branch portion 34 along the outer surface of the chemical tank 12. The exhaust tube 22 also has a floating ball 38 provided inside that floats in the chemical liquid, and a water level scale 39 that makes it possible to visually check the volume of the chemical liquid in the chemical tank 12 from the chemical liquid in the exhaust tube 22 or the floating ball 38 floating in the chemical liquid. For example, the water level scale 39 is formed of a waterproof seal or the like, and is a scale attached to the outer surface of the chemical tank 12, a scale printed on the exhaust tube 22, or a scale formed by printing or embossing on the chemical tank 12.

[0030] One end of the connecting pipe 23 is connected to the downward branch portion 35, and the other end is connected to the chemical solution injector 14. The connecting pipe 23 is flexible. For example, the connecting pipe 23 is made of a flexible resin tube or the like that is resistant to the chemical solution.

[0031] The on-off valve 24 is provided at a mounting portion 36 provided at a bent portion on the primary side of the upper branch portion 34 and the lower branch portion 35 of the connection pipe 21. The on-off valve 24 is formed so that the pipeline of the connection pipe 21 can be opened and closed manually.

[0032] The chemical injector 14 includes a volumetric pump 41 that can pump a fixed amount of chemical liquid and inject it into the connecting pipe 15, and a chemical liquid injection section 42 that connects the volumetric pump 41 and the connecting pipe 15 and is configured to prevent backflow of the chemical liquid and well water injected into the connecting pipe 15.

[0033] The volumetric pump 41 is a chemical liquid injection pump that injects a chemical liquid. For example, a diaphragm pump is used as the volumetric pump 41. For example, the volumetric pump 41 includes a pump casing 41a, a diaphragm provided in the pump casing 41a, and a DC solenoid that is a motor that drives the diaphragm. The volumetric pump 41 includes a chemical liquid suction port 41b and a discharge port 41c provided in the pump casing 41a.

[0034] Suction port 41b is provided at the bottom of pump casing 41a. Suction port 41b is connected to connecting pipe 23. Discharge port 41c is provided at the top of pump casing 41a. Discharge port 41c is connected to chemical liquid injector 42. Discharge port 41c is formed, for example, by a branch pipe, one branch of which is connected to chemical liquid injector 42 and the other branch of which is provided with plug 41d.

[0035] Such volumetric pump 41 is fixed to wall 11c and disposed below the upper surface of bottom 12a of chemical tank 12. Volumetric pump 41 is disposed with a solenoid, which is a motor, located inside wall 11c. Volumetric pump 41 is fixed to wall 11c with a fastening member.

[0036] Chemical solution injector 42 includes connecting pipe 42a, a first check valve 42b provided on one end of connecting pipe 42a, a nozzle 42c provided on first check valve 42b and communicating with connecting pipe 15, and a second check valve 42d provided on nozzle 42c. Connecting pipe 42a is formed of, for example, a flexible resin tube, similar to connecting pipe 23.

[0037] The first check valve 42b regulates the flow of liquid from the nozzle 42c side to the volumetric pump 41. That is, the first check valve 42b prevents liquid from flowing back from the nozzle 42c side to the volumetric pump 41. The first check valve 42b has, for example, a ball and a spring. The first check valve 42b closes the conduit when the ball is urged toward the primary side by the spring, and when the chemical liquid is supplied from the volumetric pump 41, the pressure of the chemical liquid moves the ball against the spring, opening the conduit.

[0038] The nozzle 42c injects the chemical liquid supplied from the volumetric pump 41 through the first check valve 42b into the connecting pipe 15.

[0039] The second check valve 42d regulates the flow of liquid from the connecting pipe 15 to the nozzle 42c. That is, the second check valve 42d prevents the liquid flowing inside the connecting pipe 15 from flowing back into the nozzle 42c. The second check valve 42d is formed, for example, from an elastically deformable resin material in a cylindrical shape with a bottom, and has a cross-shaped notch formed at the tip opposite the tip of the nozzle 42c. When the chemical liquid is supplied from the volumetric pump 41, the pressure of the chemical liquid causes the tip of the second check valve 42d to expand, widening the cross-shaped notch and opening, thereby supplying the chemical liquid to the connecting pipe 15.

[0040] Connecting pipe 15 is a pipe whose primary side is connected to water supply device 2 and whose secondary side is connected to filtration device 3. Connecting pipe 15 has, for example, an attachment part 15a at the end of the secondary side to which chemical solution injector 42 is connected. In addition, connecting pipe 15 is provided with pressure sensor 16 and flow rate sensor 17 on the primary side of attachment part 15a.

[0041] The pressure sensor 16 is connected to, for example, an electrical equipment box 19 via a signal line. The pressure sensor 16 outputs an electrical signal corresponding to the pressure of the fluid in the connecting pipe 15 to the electrical equipment box 19.

[0042] The flow rate sensor 17 is connected to, for example, the electrical box 19 via a signal line. The flow rate sensor 17 is an impeller-type flow rate sensor. The flow rate sensor 17 transmits a signal corresponding to the detected flow rate to the electrical box 19. As a specific example, the flow rate sensor 17 has, for example, a rotor that rotates due to the flow of fluid in the connecting pipe 15, a magnet, and a transmitter that detects the magnetic force of the magnet and outputs an electrical signal, and outputs an electrical signal corresponding to the flow rate based on the magnetic force detected as the rotor rotates.

[0043] The electrical equipment box 19 controls the drive of the volumetric pump 41, for example, and controls the amount of liquid medicine injected from the volumetric pump 41 into the connecting pipe 15. The electrical equipment box 19 also calculates the amount of liquid medicine remaining in the liquid medicine tank 12.

[0044] As shown in FIG. 3, the electrical box 19 includes, for example, a communication unit 51, an input unit 52, an interface 53, a display unit 54, a storage unit 55, a drive unit 57, and a control unit 58.

[0045] The communication unit 51 is controlled by the control unit 58. The communication unit 51 is any communication interface capable of communicating with a communication terminal using a wired communication technology such as USB, a short-range wireless communication technology such as Bluetooth (registered trademark) (for example, the Bluetooth Low Energy standard (hereinafter referred to as the BLE standard)), Wi-Fi (registered trademark), or NFC (Near Field Communication), a general-purpose wireless communication technology including a mobile phone line such as LTE (Long Term Evolution) (registered trademark), or a long-range wireless communication technology including a dedicated wireless communication technology such as Sigfox (registered trademark). Here, the communication terminal is a communication device provided externally, separate from the liquid injector 1.

[0046] For example, when the liquid medicine injector 1 is shipped or undergoes maintenance, the communication unit 51 communicates with an inspection communication terminal to receive data such as various parameters of the liquid medicine injector 1, such as functional parameters, internal parameters, and external parameters, various programs for controlling the drive of the volumetric pump 41 and calculating the remaining amount of liquid medicine, and change instructions for changing these data and programs, and transmits them to the memory unit 55 and the control unit 58.

[0047] The input unit 52 is an input interface for receiving user input. The input unit 52 is, for example, an operation panel including buttons. The input unit 52 is a device for receiving user input, such as a touch panel, a keyboard, or a mouse. When the chemical solution is supplied to the chemical solution tank 12, the input unit 52 can input the amount of the chemical solution in the chemical solution tank 12 as an initial value.

[0048] The pressure sensor 16 and the flow rate sensor 17 are connected to the interface 53. The interface 53 can also electrically connect to other devices. That is, the interface 53 is a terminal or circuit to which various devices are electrically connected.

[0049] The display unit 54 has, for example, a display device such as a segment display, a liquid crystal display, or an organic EL display, or a lighting unit using LEDs (Light Emitting Diodes), etc. In Fig. 2 of this embodiment, the display unit 54 is formed by an information panel having a three-digit segment display and a plurality of LEDs.

[0050] The storage unit 55 is a storage medium from which data can be read and written. The storage unit 55 includes so-called memory or storage. For example, the storage unit 55 includes a non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) (registered trademark), a ROM (Read only memory), a RAM (Random Access Memory), or a NAND flash memory. The storage unit 55 also includes an SSD (Solid State Drive) equipped with a flash memory. However, the storage unit 55 is not limited to these, and various storage media can be used. In this embodiment, as shown in FIG. 3, the storage unit 55 includes at least an EEPROM 55a and a RAM 55b.

[0051] The memory unit 55 stores data as various parameters such as function parameters, internal parameters, and external parameters used by the control unit 58, as well as various data and programs used to control the volumetric pump 41 and calculate the remaining amount of chemical solution.

[0052] The memory unit 55 stores the operating data of the volumetric pump 41, the initial amount of chemical in the chemical tank 12 when the chemical is filled (supplied) into the chemical tank 12, the remaining amount of chemical in a drought state corresponding to the lowest water level (drought level) at which air may be drawn into the chemical tank 12 when the volumetric pump 41 is driven, and the remaining amount of chemical in a reduced water state at which the chemical may reach the lowest water level within a predetermined period by continuing to drive the volumetric pump 41. Here, the remaining amount of chemical in a reduced water state is set to a range equal to or greater than the remaining amount of chemical in a drought state and equal to or less than the maximum capacity of the chemical tank 12, and is preferably greater than the remaining amount of chemical in a drought state and less than the maximum capacity of the chemical tank 12.

[0053] Here, for example, the initial value of the amount of chemical solution, the remaining amount of chemical solution during a drought, and the remaining amount of chemical solution during a decrease in water level are inputted by the input unit 52 and stored in the memory unit 55.

[0054] Furthermore, for example, memory unit 55 stores the injection amount per stroke of volumetric pump 41, correction data for the injection amount per stroke of volumetric pump 41 based on the pressure (m) detected by pressure sensor 16, and correction data for the injection amount that varies depending on the number of strokes of volumetric pump 41, either in advance or through maintenance or communication via communication unit 51. Note that here, one stroke of volumetric pump 41 means, for example, one drive of volumetric pump 41, in other words, one reciprocation of the diaphragm of volumetric pump 41, and the number of strokes means the number of times volumetric pump 41 is driven.

[0055] Fig. 5 shows correction data for the injection amount per stroke of the volumetric pump 41 based on the pressure (m) in the connecting pipe 15. Fig. 5 shows, for example, the injection amount per minute (mL / min) and / or the injection amount in one stroke (mL) when the injection pressure (m) in the connecting pipe 15 is 20m, 30m, 50m, or 70m when the volumetric pump 41 makes 150 strokes per minute (150 st / min).

[0056] This is because when the pressure inside connecting pipe 15 changes, the difference between the pressure inside connecting pipe 15 and the pressure of the medicinal liquid discharged by volumetric pump 41 and injected into connecting pipe 15 changes, and the injection amount of the medicinal liquid injected from volumetric pump 41 into connecting pipe 15 changes. For this reason, the correction data shown in Fig. 3 is data used by control unit 58 to correct the injection amount per stroke of volumetric pump 41 based on the correction data shown in Fig. 3 when the pressure (m) detected by pressure sensor 16 is 30 m, setting the injection amount per stroke of volumetric pump 41 to 0.159 mL when the pressure (m) detected by pressure sensor 16 is other than 30 m.

[0057] Fig. 6 shows correction data for the injection amount that changes depending on the number of strokes of volumetric pump 41, which is a diaphragm pump. Fig. 6 shows data that indicates the injection amount that changes as volumetric pump 41 repeats strokes, and is data for correcting the injection amount per stroke of volumetric pump 41 in accordance with the injection amount that decreases as the number of strokes increases.

[0058] This is because, if volumetric pump 41 is a diaphragm pump, repeated strokes will cause the injection amount per stroke to decrease due to changes in the elastic modulus of the diaphragm or stretching. For this reason, the correction data in Fig. 6 is data used by control unit 58 to perform a correction based on a deterioration in the performance of volumetric pump 41, thereby reducing the injection amount from the initially set injection amount per stroke of volumetric pump 41 in accordance with the total number of strokes.

[0059] Furthermore, the memory unit 55 stores the injection amount of the medicinal liquid relative to the flow rate, which is set in advance so that the control unit 58 can control the injection amount of the medicinal liquid relative to the flow rate. As a specific example, the memory unit 55 stores, for example, the number of strokes per unit time or the injection amount corresponding to the flow rate detected by the flow rate sensor 17.

[0060] The driving unit 57 is electrically connected via a signal line to a DC solenoid, which is the motor of the volumetric pump 41, and to the control unit 58. The driving unit 57 controls the number of strokes per unit time of the DC solenoid by varying the output frequency.

[0061] The control unit 58 is a processor. The control unit 58 is, for example, a microcomputer. Note that the control unit 58 is not limited to a microcomputer and may be a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), a DSC (Digital Signal Controller), or other general-purpose or dedicated processor. Furthermore, when a module including a processor is used in the communication unit 51 or the like, the control unit 58 may be the module.

[0062] The control unit 58 controls the drive of the volumetric pump 41 based on various data and programs stored in the memory unit 55. The control unit 58 controls the drive of the volumetric pump 41 based on, for example, the flow rate detected by the flow rate sensor 17 and the number of strokes per unit time corresponding to the flow rate stored in the memory unit 55.

[0063] Furthermore, control unit 58 calculates the remaining amount of liquid chemical in liquid chemical tank 12 from the initial value of the amount of liquid chemical in liquid chemical tank 12 stored in memory unit 55, the injection amount per stroke of volumetric pump 41, and the number of strokes of volumetric pump 41 after the initial value is input. For example, when the number of strokes reaches a predetermined number, control unit 58 calculates the remaining amount of liquid chemical in liquid chemical tank 12 and stores it in memory unit 55.

[0064] Here, a specific example of a method for calculating the remaining amount of chemical in the liquid chemical tank 12 will be described. First, when an operator supplies or refills the liquid chemical to the liquid chemical tank 12, the operator reads the amount of chemical in the liquid chemical tank 12 from the water level scale 39 or the like, and inputs the amount of chemical through the input unit 52 as the initial value of the amount of chemical in the liquid chemical tank 12. For example, if the amount of chemical in the liquid chemical tank 12 is 20 L, the amount of chemical input through the input unit 52 is set as the initial value of the amount of chemical. For example, when "20 L" is input through the input unit 52, the control unit 58 sets 20 L as the initial value and stores it in the memory unit 55.

[0065] Furthermore, control unit 58 calculates the cumulative number of strokes by accumulating the number of strokes of volumetric pump 41 from the time the initial value is set, and stores the calculated cumulative number of strokes in memory unit 55. Control unit 58 also calculates the cumulative injection amount by multiplying the injection amount of the medicinal liquid per stroke of volumetric pump 41 by the cumulative number of strokes, and stores the calculated cumulative injection amount in memory unit 55.

[0066] For example, if the injection amount per stroke of volumetric pump 41 is 0.16 mL, control unit 58 multiplies 0.16 mL by the cumulative number of strokes to calculate the cumulative injection amount, and stores the calculated amount in memory unit 55.

[0067] The control unit 58 calculates the remaining amount of liquid medicine in the liquid medicine tank 12 by subtracting the calculated cumulative injection amount from the set initial value of the liquid medicine amount, and stores the calculated amount in the memory unit 55. For example, if the injection amount per stroke of the volumetric pump 41 is 0.16 mL, 1 L is consumed for every 6,250 strokes. Therefore, the control unit 58 calculates the remaining amount of liquid medicine by adding 0.1 L to the cumulative injection amount every 625 strokes and subtracting the cumulative injection amount from the set initial value of 20 L. To reduce the number of writes to the EEPROM 55a of the memory unit 55, for example, the control unit 58 stores the cumulative injection amount and the remaining amount of liquid medicine calculated every 625 strokes in the RAM 55b of the memory unit 55, and then stores the cumulative injection amount every 1 L in the EEPROM 55a of the memory unit 55, which is a non-volatile memory, as a countermeasure against power outages. Using this example method, the control unit 58 calculates the remaining amount of liquid medicine in the liquid medicine tank 12.

[0068] Furthermore, control unit 58 may correct the amount of medicinal liquid injected per stroke of volumetric pump 41 based on the pressure inside connecting pipe 15 and / or the cumulative number of strokes of volumetric pump 41.

[0069] Here, a specific example of a method for correcting the injection amount of the liquid medicine per stroke of the volumetric pump 41 will be described.

[0070] The control unit 58 calculates the pressure inside the connecting pipe 15 based on a signal output from the pressure sensor 16 that is based on the pressure inside the connecting pipe 15. Then, based on correction data for the injection amount of the volumetric pump 41 relative to the pressure inside the connecting pipe 15, as shown in FIG. 5 , which is pre-stored in the memory unit 55, and the pressure inside the connecting pipe 15, the control unit 58 corrects the injection amount of the chemical solution per stroke of the volumetric pump 41. The control unit 58 calculates the cumulative injection amount from the corrected injection amount of the chemical solution per stroke and the cumulative number of strokes, and calculates the remaining amount of the chemical solution from the cumulative injection amount based on this corrected injection amount of the chemical solution. The control unit 58 stores the calculated remaining amount of the chemical solution in the memory unit 55 and displays it on the display unit 54. The control unit 58 also outputs information such as the remaining amount of the chemical solution (water level information) and operation information to an external communication terminal from the communication unit 51, for example, every predetermined number of strokes, every predetermined time, or at a set date and time. The control unit 58 may have a calendar function and a clock function, and may store the remaining amount of liquid medicine in the storage unit 55 in association with the date and time.

[0071] Control unit 58 also stores the total number of strokes of volumetric pump 41 since volumetric pump 41 first starts to be driven in memory unit 55. Control unit 58 corrects the current injection amount of the liquid medicine per stroke of volumetric pump 41 based on injection amount correction data for the number of strokes of volumetric pump 41 as shown in Fig. 6, which is stored in advance in memory unit 55, and the total number of strokes of volumetric pump 41 stored in memory unit 55. Control unit 58 then obtains the cumulative injection amount from the corrected injection amount of the liquid medicine per stroke and the cumulative number of strokes, and calculates the remaining amount of the liquid medicine from the cumulative injection amount based on this corrected injection amount of the liquid medicine.

[0072] Using at least one of these methods, the control unit 58 may correct the amount of chemical solution injected per stroke, and then calculate the remaining amount of chemical solution in the chemical solution tank 12 based on the corrected amount of chemical solution injected, thereby improving accuracy.

[0073] Furthermore, the control unit 58 determines whether the water level is low or low based on the remaining amount of chemical solution during a drought and a decrease in water level stored in the memory unit 55 and the calculated remaining amount of chemical solution in the chemical tank 12, and displays the determined information on the display unit 54 and outputs the determined information to the outside via the communication unit 51. Note that the electrical box 19 has an alarm means for announcing information by sound, and the determined information may be notified by sound. Furthermore, when the control unit 58 determines that the water level is low, it stops driving the volumetric pump 41.

[0074] As a specific example, control unit 58 calculates the amount of liquid medicine that can be consumed before a drought occurs based on the initial value of the amount of liquid medicine in liquid medicine tank 12 (the amount of liquid medicine after refilling) and the remaining amount of liquid medicine at the drought time stored in memory unit 55. For example, if the initial value of the amount of liquid medicine in liquid medicine tank 12 is 20 L and the remaining amount of liquid medicine at the drought time is set to 1 L, the amount of liquid medicine that can be consumed before a drought occurs is 19 L. Furthermore, if the injection amount per stroke is 0.16 mL, the cumulative number of strokes until the 19 L of liquid medicine that can be consumed is 118,750 strokes. Therefore, control unit 58 drives and controls volumetric pump 41 until the calculated remaining amount of liquid medicine reaches the drought time remaining amount. When the calculated remaining amount of liquid medicine reaches the drought time remaining amount, control unit 58 determines that a drought has occurred, displays an alarm on display unit 54, and outputs a signal indicating a drought via communication unit 51. Control unit 58 also stops operation of volumetric pump 41.

[0075] Furthermore, control unit 58 calculates the amount of chemical liquid that can be consumed before the water level is reduced based on the initial value of the amount of chemical liquid in chemical tank 12 (the amount of chemical liquid after refilling) and the remaining amount of chemical liquid when the water level is reduced stored in memory unit 55. For example, if the initial value of the amount of chemical liquid in chemical tank 12 is 20 L and the remaining amount of chemical liquid when the water level is reduced is set to 2 L, the amount of chemical liquid that can be consumed before the water level is reduced is 18 L. Furthermore, if the injection amount per stroke is 0.16 mL, the cumulative number of strokes until the consumable amount of chemical liquid, 18 L, is consumed is 112,500 strokes.

[0076] For this reason, the control unit 58 drives and controls the volumetric pump 41 until the calculated remaining amount of chemical solution reaches the remaining amount of chemical solution at the time of reduced water level. When the calculated remaining amount of chemical solution reaches the remaining amount of chemical solution at the time of reduced water level, the control unit 58 determines that the water level is reduced, displays an alarm on the display unit 54, and outputs a signal indicating reduced water level via the communication unit 51. Note that even if the control unit 58 determines that the water level is reduced, it continues to operate the volumetric pump 41 until it determines that the water level is reduced. By determining this reduced water level and notifying the outside via the communication unit 51 and the display unit 54, chemical solution can be replenished between the time when the water level is reduced and the time when the water level is reduced, allowing for ample time for ordering and procuring chemical solution. Therefore, the remaining amount of chemical solution at the time of reduced water level stored in the memory unit 55 is appropriately set based on the installation location of the chemical solution injection device 1, the time when chemical solution can be ordered and procured, etc.

[0077] 1, the water supply device 2 is installed, for example, in a well serving as a water supply source 101, and is configured to be able to pump well water. The water supply device 2 includes, for example, a water supply pump 111, a suction pipe 112 connected to the water supply pump 111 and disposed in the water supply source 101, a discharge pipe 113 connected to the water supply pump 111 and a connecting pipe 15, a detection sensor 114 provided in the discharge pipe 113, a pressure tank 115 provided in the discharge pipe 113, and a control panel 119.

[0078] The water supply pump 111 includes, for example, a pump and a motor. In the example shown in Fig. 1, the water supply pump 111 is an example of a land pump, but the water supply pump 111 may be a submersible pump installed in well water.

[0079] The suction pipe 112 has, for example, a check valve 112 a that prevents water from flowing back from the water supply pump 111 to the water supply source 101 .

[0080] The detection sensor 114 includes, for example, a flow rate sensor 114a and a pressure sensor 114b.

[0081] The flow rate sensor 114a is, for example, a float switch. The flow rate sensor 114a is connected to the control panel 119 via a signal line and outputs a signal of the detected flow rate to the control panel 119. The flow rate sensor 114a, for example, detects only ON and OFF at a fixed flow rate. The flow rate sensor 114a is configured to be able to detect, for example, that the flow rate in the discharge pipe 113 is the stop flow rate of the water supply pump 111 and output a signal to the control panel 119.

[0082] Pressure sensor 114b is configured to be able to detect the pressure inside discharge pipe 113. Pressure sensor 114b is connected to control panel 119 via a signal line and outputs a signal of the detected pressure to control panel 119. Pressure sensor 114b is configured to be able to at least detect that the pressure inside discharge pipe 113 is the starting pressure of water supply pump 111 and output a signal to control panel 119.

[0083] The control panel 119 drives and controls the motor of the water supply pump 111. The control panel 119 starts the water supply pump 111 when the pressure in the discharge pipe 113 reaches the starting pressure, and stops the water supply pump 111 when the flow rate in the discharge pipe 113 reaches the stopping flow rate.

[0084] The control panel 119 includes, for example, a communication unit, an input unit, an interface, a display unit, a storage unit, a drive unit, and a control unit. Note that the communication unit, input unit, interface, display unit, storage unit, drive unit, and control unit have the same configuration as the communication unit 51, input unit 52, interface 53, display unit 54, storage unit 55, drive unit 57, and control unit 58 of the electrical box 19 described above, and detailed description thereof will be omitted.

[0085] The memory unit stores the starting pressure and stopping flow rate of the water supply pump 111. The memory unit also stores data as various parameters such as functional parameters, internal parameters, and external parameters used by the control unit, as well as various data and programs used to control the water supply pump 111. The control unit controls the water supply pump 111 based on the various data and programs stored in the memory unit. The control unit starts the water supply pump 111 when the pressure detected by the pressure sensor 114b exceeds the starting pressure stored in the memory unit, and stops the water supply pump 111 when the flow rate sensor 114a detects the stopping flow rate.

[0086] The filtration device 3 removes, for example, iron and manganese contained in treated water obtained by injecting a chemical solution into raw water from the water supply source 101 using the chemical solution injector 1, and also removes solid matter such as sand present during treatment. The filtration device 3 includes a tank body 211, a filtration material 212, a suction pipe 213, and a water collection pipe 214. The filtration device 3 may also be configured to be appropriately equipped with a pump device, an on-off valve, a water tank, piping, etc. to enable backwashing, cleaning, etc.

[0087] The tank body 211 accommodates the filtering material 212. The tank body 211 accommodating the filtering material 212 forms a space above the filtering material 212 in which the suction pipe 213 is disposed. In addition, the tank body 211 has a water collection pipe 214 connected to its lower end.

[0088] The filter material 212 removes, for example, iron from raw water into which a chemical solution has been injected, manganese from raw water into which a chemical solution has been injected, and solids contained in the raw water.

[0089] The suction pipe 213 is connected to the connecting pipe 15. One end of the water collection pipe 214 is provided inside the tank body 211, and the other end is connected to a water supply destination. Here, the water supply destination is, for example, a water tank or a water faucet. A filter, for example, is provided at the end of the water collection pipe 214 inside the tank body 211.

[0090] Next, an example of a method for controlling the chemical liquid injector 1 of the water treatment device 100 configured as above will be described with reference to the flowchart shown in FIG.

[0091] First, when power is applied to the electrical box 19 of the liquid chemical injector 1, the power to the electrical box 19 is turned on (step ST1) and the device enters a standby state. When the operator checks the amount of liquid chemical in the liquid chemical tank 12 and operates the input unit 52 to input the amount of liquid chemical in the liquid chemical tank 12, the control unit 58 stores the input amount of liquid chemical in the memory unit 55 as an initial value, and the initial value of the liquid chemical amount is set (step ST2).

[0092] Then, when the power to water supply device 2 is turned on and water supply pump 111 is driven by control panel 119, water supply pump 111 supplies raw water from water supply source 101 to the secondary side. When raw water is discharged from water supply pump 111 and flows through connecting pipe 15, flow rate sensor 17 detects the flow of raw water and outputs a detected flow rate signal to control unit 58 via interface 53. Based on this signal, control unit 58 drives volumetric pump 41 and injects chemical solution into connecting pipe 15. The raw water (treated water) into which the chemical solution has been injected then moves to filtration device 3, where it is treated to remove iron and manganese before being supplied to the destination.

[0093] When the liquid medicine is injected by the volumetric pump 41, the control unit 58 integrates the number of strokes of the driven volumetric pump 41, calculates the integrated number of strokes, and stores the integrated number of strokes in the memory unit 55 (step ST3). The control unit 58 calculates the integrated injection amount from the calculated integrated number of strokes and the injection amount of the liquid medicine per stroke stored in the memory unit 55, and stores the calculated amount in the memory unit 55 (step ST4). At this time, the value of the injection amount of the liquid medicine per stroke of the volumetric pump 41 may be corrected from the pressure value detected by the pressure sensor 16 and / or the total number of strokes of the volumetric pump 41, and the integrated injection amount may be calculated from the corrected value.

[0094] Control unit 58 subtracts the cumulative injection amount from the initial value to calculate the remaining amount of liquid medicine, and stores the calculated amount in memory unit 55 (step ST5). Control unit 58 may be configured to calculate the remaining amount of liquid medicine for each predetermined number of strokes of volumetric pump 41, for each predetermined time, for a set time, or for a constant calculation of the remaining amount of liquid medicine. Similarly, the period for storing the calculated remaining amount of liquid medicine in memory unit 55 can be set appropriately to each number of strokes, for each predetermined time, or for a constant calculation. However, it is preferable to calculate the remaining amount of liquid medicine for each predetermined number of strokes, taking into consideration the number of times the amount of medicine is stored in memory unit 55, power consumption, and the operating status of volumetric pump 41.

[0095] Next, the control unit 58 determines whether the calculated remaining amount of chemical solution is equal to or less than the remaining amount of chemical solution at reduced water level (step ST6). If the remaining amount of chemical solution is greater than the remaining amount of chemical solution at reduced water level (NO in step ST6), the control unit 58 returns to step ST3 and continues accumulating the number of strokes. If the remaining amount of chemical solution is equal to or less than the remaining amount of chemical solution at reduced water level (YES in step ST6), the control unit 58 displays a low water level on the display unit 54, issues a warning as a pre-alarm via the display unit 54, and controls the communication unit 51 to output low water level warning information to an external communication device (step ST7).

[0096] Next, the control unit 58 determines whether the calculated remaining amount of liquid medicine is equal to or less than the drought level (step ST8). If the remaining amount of liquid medicine is greater than the drought level (NO in step ST8), the control unit 58 returns to step ST3 and continues accumulating the number of strokes. If the remaining amount of liquid medicine becomes the drought level (YES in step ST8), the control unit 58 displays a drought on the display unit 54, issues an alarm via the display unit 54, controls the communication unit 51 to output drought alarm information to an external communication device, and stops the volumetric pump 41 (step ST7). Then, the control unit 58 returns to step ST2, waits until the liquid medicine is supplied to the liquid medicine tank 12 and an initial amount of liquid medicine is set via the input unit 52, and executes the processes from step ST3 onward once the initial amount of liquid medicine is set via the input unit 52. In addition, the control unit 58 may output warning information for low water level and drought only once when detected, or may repeatedly output the warning information to the outside, for example, at regular intervals until a command to stop outputting the warning information is input by operating the input unit 52 or via the communication unit 51.

[0097] With the chemical liquid injection device 1 and water treatment device 100 configured in this manner, after the chemical liquid is added (supplied) to the chemical liquid tank 12, or at any other time, the initial value of the amount of chemical liquid in the chemical liquid tank 12 is stored in the memory unit 55, and the remaining amount of chemical liquid can be determined by subtracting the cumulative injection amount obtained by multiplying the known injection amount per stroke by the number of strokes of the volumetric pump 41 from the initial value, thereby detecting the water level during a water shortage and drought.

[0098] Therefore, even if the chemical injection device 1 is configured not to have a water level sensor or the like, it can detect the water level of the chemical tank 12. Furthermore, although the control unit 58 has been described as being configured to determine whether the chemical liquid in the chemical tank 12 is the remaining amount of chemical liquid when the water level is low or when the water level is low, the present invention is not limited to this, and the level of the remaining amount of chemical liquid in the chemical tank 12 can be detected from the remaining amount of chemical liquid and an initial value, or an arbitrary remaining amount of chemical liquid other than the remaining amount of chemical liquid when the water level is low or when the water level is low can be set and the arbitrary remaining amount of chemical liquid can be compared with the determined remaining amount of chemical liquid.

[0099] In addition, the control unit 58 can correct the injection amount per stroke from the pressure value in the pipe (e.g., connecting pipe 15) through which the medicinal liquid is injected detected by the pressure sensor 16 and / or the total number of strokes of the volumetric pump 41, thereby improving the accuracy of the calculated remaining amount of medicinal liquid.

[0100] Furthermore, the control unit 58 displays the calculated remaining amount of the liquid medicine on the display unit 54, controls the communication unit 51, and transmits various information such as the remaining amount of the liquid medicine to an external communication device. Furthermore, when the control unit 58 detects a decrease or drought in the amount of the liquid medicine, it transmits alarm information to the external communication device. This makes it possible to grasp the remaining amount of the liquid medicine via a communication terminal, for example, from a location away from the location where the liquid medicine injector 1 is installed. Note that communication between the communication unit 51 and the communication terminal can be performed using either a short-range communication method or a long-range communication method.

[0101] As a specific example, when a short-distance communication method is used, as shown in Fig. 7, alarm information is output from communication unit 51 to communication terminal 200, such as a smartphone, carried by an end user who uses well water disinfected by chemical liquid injection device 1. Upon receiving the alarm information, communication terminal 200 displays the received information on a display or the like using a program or application, allowing the user to check the information about chemical liquid injection device 1 even from inside a home or other indoor location. This allows chemical liquid injection device 1 to quickly replenish chemical liquid.

[0102] 8, when a long-distance communication method is used, for example, control unit 58 transmits information to long-distance communication panel 300 or a base station via communication unit 51 by wired or wireless communication such as short-distance communication, and long-distance communication panel 300 then transmits the information to server 400. Note that long-distance communication panel 300 is configured to be able to receive information from each chemical liquid injector 1 within its communication range and from each model of other water supply device with which it can communicate, and transmit the information to server 400.

[0103] The maintenance contractor for the water treatment device 100 receives information from the server 400 using a communication terminal 500 such as a PC or smartphone, and displays the received information on a display or the like using a program or application on the communication terminal 500, thereby allowing the contractor to always be aware of information including the remaining amount of chemical liquid in the chemical liquid injection device 1.

[0104] Furthermore, when the remaining amount of chemical liquid is at the low water level, chemical liquid injection device 1 displays warning information as a pre-alarm on display unit 54 and transmits the warning information to the communication terminal via communication unit 51, thereby enabling the user to know that chemical liquid needs to be replenished before the chemical liquid in chemical liquid tank 12 reaches the low water level. Therefore, by using chemical liquid injection device 1, the user can prepare the chemical liquid before the water level of the chemical liquid drops to the low water level.

[0105] For these reasons, liquid injector 1 transmits alarm information to an external communication terminal, and by checking the alarm information from the communication terminal, the information can be easily obtained even at a location far from liquid injector 1. Therefore, liquid injector 1 can replenish liquid on-site safely and at an appropriate frequency.

[0106] The terminals 200, 400, 500 serving as external communication devices with which the chemical liquid injector 1 communicates may be, for example, a management server, a programmable controller, a PC that processes information and inputs, a smartphone, a tablet, a laptop, a mobile terminal such as a feature phone, or a game console, but the terminals are not limited to these and may also be dedicated communication devices. These external communication devices, together with the water treatment device 100 including the chemical liquid injector 1, constitute a management system that manages the chemical liquid injector 1 and / or the water treatment device 100.

[0107] Such a terminal includes, for example, a communication unit, an input unit, a display unit, a storage unit, and a processor. An example of the configuration of the terminal will be described below.

[0108] The communication unit is a communication interface controlled by a processor and capable of communicating with devices such as the liquid injector 1 and the server 400 using, for example, wireless communication technology. Specifically, the communication unit can connect to the electrical box 19, the long-distance communication panel 300, the server 400, and other terminals using wireless communication technology such as short-range wireless communication technology, such as Bluetooth (registered trademark) (e.g., the BLE standard), Wi-Fi (registered trademark), and NFC (Near Field Communication), and long-range wireless communication technology, such as general-purpose wireless communication technology including cellular phone lines such as LTE (Long Term Evolution) and dedicated wireless communication technology such as Sigfox (registered trademark). The communication unit may also be configured to connect to other external devices using wired communication technology, such as USB, in addition to wireless communication. The communication unit may include a typical communication interface of a mobile terminal capable of communicating with a management server or other communication terminals via a network. For example, the communication unit may be configured to transmit data, such as function parameters, internal parameters, and external parameters, used in the liquid injector 1, various programs, and change instructions for changing these data and programs, to the electrical box 19.

[0109] The input unit is an input I / F for accepting user input, and may be built into the terminal or may be externally attached to the terminal. The input unit may be, for example, a keyboard, a mouse, a numeric keypad, a microphone, a camera, or may have output I / F functionality such as a touch screen. Here, user input includes, for example, tapping, clicking, dragging, pressing a specific key, and voice captured by a microphone.

[0110] The display unit is an example of an output I / F for outputting images and / or audio in accordance with processing by the processor, and may include a display device for displaying moving images, still images, text, etc. The display unit may also include a speaker for outputting audio, music, etc. Examples of the display device include a liquid crystal display, an organic EL (electroluminescence) display, and a CRT (cathode ray tube) display. The display device displays display data including content. Note that the display device may also have input I / F functionality, such as a touch screen. The display unit is an example of display means.

[0111] The storage unit stores programs executed by the processor to realize each process, data used by the processor, etc. The storage unit is what is known as memory or storage. The storage unit may include a RAM having a work area in which the programs / data are deployed. Programs stored in the storage unit include, for example, firmware, an OS, and a communication program, as appropriate. For example, the terminal program stores data such as names, units, and settable ranges for all internal parameters in advance.

[0112] The processor is typically a CPU, but may also be a microcomputer, FPGA, DSP, GPU (Graphics Processing Unit), or other general-purpose or dedicated processor. The processor communicates wirelessly with the chemical liquid injector 1 via a communication unit and executes processes for managing the water treatment device 100 including the chemical liquid injector 1. The processor can function as a terminal as a communication control unit and processing unit by executing a program stored in memory. Note that the functional division of each unit within the processor is for convenience and can be changed as appropriate. The communication control unit and processing unit are examples of a first receiving means, a first changing means, a first transmitting means, a second receiving means, a second changing means, and a second transmitting means.

[0113] The communication control unit controls the communication unit to perform wireless communication with devices such as the liquid injector 1, the long-distance communication panel 300, and / or the server 400. The communication control unit may also transmit some data for establishing a connection with the liquid injector 1 via the communication unit, or may transmit a request to the liquid injector 1 in response to an operation by an operator. Alternatively, the communication control unit may receive some data for establishing a connection between the terminal and the liquid injector 1, for example, a request from the liquid injector 1 acting as an advertiser when the liquid injector 1 and the communication terminal 200 are connected via Bluetooth as a scanner and an advertiser, respectively.

[0114] When the communication control unit establishes communication with the communication unit 51 of the chemical liquid injection device 1, for example, when the target device is in automatic operation mode, the communication control unit receives various operating data, various parameters, etc. from the electrical box 19 via the communication unit.

[0115] The processing unit executes various information processing operations such as inspection, maintenance, management, parameter viewing and changing, and program updating of the liquid injector 1.

[0116] For example, when the processing unit receives various operating data and external parameters via the communication unit, it displays a portion of the received content on the display unit and changes the displayed portion in response to the user's scrolling operation.

[0117] The configuration of the terminal is not limited to these, and can be set appropriately as long as it is capable of communicating with the liquid medicine injection device 1, receiving information including the remaining amount of liquid medicine in the liquid medicine injection device 1, displaying the information on the display unit, and issuing an alarm by displaying an alarm or sounding an alarm, etc.

[0118] As described above, according to the liquid injector 1 of the embodiment of the present invention, the remaining amount of liquid can be detected from the input amount of liquid in the liquid tank 12 and the driving status of the volumetric pump 41.

[0119] The present invention is not limited to the above-described configuration. For example, in the above example, the liquid injector 1 has the pressure sensor 16 and the flow rate sensor 17, the control unit 58 controls the volumetric pump 41 based on the pressure and flow rate detected by the pressure sensor 16 and the flow rate sensor 17, and the injection amount of the liquid per stroke can be corrected based on the pressure value detected by the pressure sensor 16. However, the present invention is not limited to this configuration.

[0120] For example, like another embodiment of water treatment device 100 shown in Fig. 9, chemical liquid injector 1 may be configured without pressure sensor 16 and / or flow rate sensor 17. In such a chemical liquid injector 1, for example, electrical box 19 and control panel 119 may be configured to be able to send and receive information via wired signal lines or wireless communication via communication unit 51, and electrical box 19 may be configured to control volumetric pump 41 and correct the amount of chemical liquid injected per stroke based on the flow rate and pressure detected by flow rate sensor 114a and pressure sensor 114b of water supply device 2 transmitted from control panel 119. In this case, flow rate sensor 114a may be, for example, an impeller-type flow rate sensor similar to flow rate sensor 17.

[0121] In the above example, the liquid injector 1 is configured to be able to correct the amount of liquid injected per stroke based on the pressure value detected by the pressure sensor 16 and / or the total number of strokes of the volumetric pump 41, but this is not limiting. For example, the liquid injector 1 may be configured not to correct the amount of liquid injected per stroke, or may be configured to correct the amount of liquid injected per stroke by another method.

[0122] Furthermore, in the above example, an example of an external communication terminal has been described, but the configuration of the terminal and the system configuration of the chemical liquid injector 1 and the water treatment device 100 using the terminal for treatment and management can be set as appropriate.

[0123] In the above example, a diaphragm pump was described as an example of the volumetric pump 41, but the volumetric pump 41 is not limited to this, and may be a plunger pump or another pump.

[0124] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. The following is a description equivalent to the invention described in the original claims of the present application. [1] A chemical tank for storing a chemical; a volumetric pump that injects the chemical solution stored in the chemical solution tank into an injection destination; a control unit that drives the volumetric pump, and accumulates the number of strokes of the volumetric pump since the amount of the liquid chemical in the liquid chemical tank was set, calculates an accumulated injection amount by multiplying the accumulated number of strokes by the injection amount of the liquid chemical per stroke, and calculates the remaining amount of the liquid chemical in the liquid chemical tank by subtracting the accumulated injection amount from the set amount of the liquid chemical in the liquid chemical tank; A chemical liquid injection device comprising: [2] A pressure sensor is provided to detect the pressure of the injection destination, The liquid medicine injector according to [1], wherein the control unit corrects the injection amount of the liquid medicine per stroke of the volumetric pump in accordance with the pressure detected by the pressure sensor. [3] The chemical liquid injector according to [1] or [2], wherein the control unit corrects the injection amount of the chemical liquid per stroke of the volumetric pump according to the total number of strokes of the volumetric pump. [4] A chemical liquid injection device described in any one of [1] to [3], wherein the control unit can set the remaining amount of chemical liquid in the chemical liquid tank when there is a drought, and determines drought based on the calculated remaining amount of chemical liquid and the remaining amount of chemical liquid when there is a drought. [5] A chemical liquid injection device described in any one of [1] to [4], wherein the control unit can set the amount of chemical liquid remaining when the water level is low within a range that is equal to or greater than the amount of chemical liquid remaining in the chemical liquid tank when the water level is low and less than the maximum capacity of the chemical liquid tank, and determines whether the water level is low based on the calculated amount of chemical liquid remaining and the amount of chemical liquid remaining when the water level is low. [6] A communication unit that transmits information to an external communication device; The liquid medicine injector according to any one of [1] to [5], wherein the control unit controls the communication unit and transmits the remaining amount of the liquid medicine to the communication device. [7] The control unit, when determining that a drought has occurred, controls the communication unit, transmits warning information about the drought to the communication device, and stops the volumetric pump. The chemical liquid injection device described in [6], which is subordinate to [4]. [8] A chemical liquid injection device as described in [6], which is subordinate to [5], in which, when the control unit determines that the water level has decreased, it controls the communication unit and transmits warning information about the water level having decreased to the communication device. [Explanation of symbols]

[0125] 1...chemical liquid injector, 2...water supply device, 3...filtration device, 100...water treatment device, 11...frame, 11a...legs, 11b...first base, 11c...wall portion, 11d...second base, 12...chemical liquid tank, 12a...bottom, 12b...supply port, 12c...lid body, 13...piping unit, 14...chemical liquid injector, 15...connecting pipe, 15a...mounting portion, 16...pressure sensor, 17...flow rate sensor 19...electrical box, 21...connecting pipe, 22...exhaust tube, 23...connecting pipe, 24...on-off valve, 31...screw portion, 32...flange, 33...nut, 34...upper branch portion, 35...lower branch portion, 36...mounting portion, 38...floating ball, 39...water level scale, 41...volumetric pump, 41a...pump casing, 41b...suction port, 41c...discharge port, 41d...plug, 42...chemical solution injection section, 42a...connecting piping, 42b...first check valve, 42c...nozzle, 42d...second check valve, 51...communication section, 52...input section, 53...interface, 54...display section, 55...memory section, 55a...EEPROM, 55b...RAM, 57...drive section, 58...control section, 101...water supply source, 111...water supply pump, 112...suction pipe, 112a...check valve, 113...discharge pipe, 114...detection sensor, 114a...flow rate sensor, 114b...pressure sensor, 115...pressure tank, 119...control panel, 200...terminal (smartphone), 211...tank body, 212...filter material, 213...suction pipe, 214...water collection pipe, 300...long-distance communication panel, 400...terminal (server), 500...communication terminal (PC, smartphone).

Claims

1. a chemical tank for storing a chemical; a volumetric pump that injects the chemical solution stored in the chemical solution tank into an injection destination; a control unit that drives the volumetric pump, and accumulates the number of strokes of the volumetric pump since the amount of the liquid chemical in the liquid chemical tank was set, calculates an accumulated injection amount by multiplying the accumulated number of strokes by the injection amount of the liquid chemical per stroke, and calculates the remaining amount of the liquid chemical in the liquid chemical tank by subtracting the accumulated injection amount from the set amount of the liquid chemical in the liquid chemical tank; Equipped with The control unit corrects the amount of the liquid medicinal fluid injected per stroke of the volumetric pump in accordance with a total number of strokes of the volumetric pump.

2. a pressure sensor for detecting the pressure of the injection destination; 2. The chemical liquid injector according to claim 1, wherein the control unit corrects the injection amount of the chemical liquid per stroke of the volumetric pump in accordance with the pressure detected by the pressure sensor.

3. 3. The chemical liquid injector according to claim 1, wherein the control unit is capable of setting a remaining amount of chemical liquid in the chemical liquid tank during a drought, and determining whether a drought has occurred based on the determined remaining amount of chemical liquid and the remaining amount during a drought.

4. 4. The chemical liquid injection device according to claim 1, wherein the control unit can set the remaining amount of chemical liquid when the water level is low within a range equal to or greater than the remaining amount of chemical liquid when the water level is low and equal to or less than the maximum capacity of the chemical liquid tank, and determines whether the water level is low based on the calculated remaining amount of chemical liquid and the remaining amount of chemical liquid when the water level is low.

5. a communication unit that transmits information to an external communication device; The liquid injector according to claim 1 , wherein the control unit controls the communication unit to transmit the remaining amount of liquid to the communication device.

6. 6. The chemical liquid injector according to claim 5, dependent on claim 3, wherein, when the control unit determines that a drought has occurred, the control unit controls the communication unit to transmit drought warning information to the communication device and stop the volumetric pump.

7. 6. The chemical liquid injector according to claim 5, wherein the control unit, when determining that the water level has decreased, controls the communication unit to transmit warning information about the water level decrease to the communication device.

Images