JP4511074B2 - Liquid delivery device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid delivery apparatus, and more particularly to a liquid delivery apparatus capable of accurately and stably supplying a certain volume of liquid at a desired flow rate without losing the delivery performance of the liquid to be delivered.
[0002]
[Prior art]
As a conventional liquid delivery apparatus, there is an apparatus that delivers liquid flowing into a casing from a supply source via an inflow side conduit to the outflow side conduit based on rotation of a rotor. In this liquid delivery device, the rotor is driven to rotate in accordance with the delivery amount of the liquid, so that a fixed volume of liquid flows out based on the amount of liquid accommodated between the casing and the rotor and the rotational speed of the rotor. Can be sent to the side.
[0003]
[Problems to be solved by the invention]
However, according to the conventional liquid delivery device, there may be a case where a sufficient amount of liquid cannot be taken into the casing when viscosity variation, pressure variation, or bubble mixing occurs in the liquid to be delivered through the inflow side pipe line. In particular, if the rotational speed of the rotor is large with respect to the flow rate flowing into the casing, the inflow side pipe line becomes negative pressure and the liquid cannot be sent, so that a certain amount of liquid can be accurately delivered. There is a problem that it cannot be done.
[0004]
Therefore, an object of the present invention is to always stably supply a liquid to be delivered without being affected by fluctuations in the viscosity or pressure of the liquid, and to deliver a constant volume of liquid with a desired flow rate accurately and stably. An object of the present invention is to provide a liquid delivery device that can be made to operate.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a delivery means for delivering pressurized liquid flowing from the inflow part to the outflow part at a constant volume, and a desired flow rate according to the pressure of the pressurized liquid at a constant volume. Sending control means for sending A first pressure detector that outputs a first pressure detection signal corresponding to the pressure of the pressurized liquid in the inflow portion, and a pressurization amount of the pressurized liquid based on the first pressure detection signal On the basis of the second pressure detection signal, a second pressure detector that outputs a second pressure detection signal corresponding to the pressure of the pressurized liquid in the outflow portion, and a second pressure detection signal. A drive controller that varies a delivery amount of the delivery means, and the delivery control means receives the pressure detection signal indicating the negative pressure of the inflow part from the first pressure detector, and the inflow part A signal for increasing the pressurization amount is output to the pressurization amount regulator so that the pressure of the pressure does not become negative, and a pressure detection signal exceeding a predetermined pressure range is input from the second pressure detector. Output a signal to the drive controller to reduce the delivery amount of the delivery means. A liquid delivery device is provided.
[0006]
According to the above-described liquid delivery device, the pressurized liquid is supplied to the delivery means and is delivered based on the delivery operation, so that the inflow portion and the outflow portion of the delivery means are based on the shape of the piping, the viscosity of the liquid, and the flow velocity. A pressure loss occurs and a pressure corresponding to the flow is generated. Since this pressure changes in accordance with the above-described liquid viscosity, flow velocity, etc., the control means monitors at least the pressure in the inflow portion of the delivery means so that the desired flow rate is delivered at a constant volume. By doing so, the pressurized liquid can stably flow into the delivery means.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the liquid delivery apparatus of the present invention will be described in detail with reference to the drawings.
[0007]
FIG. 1 partially shows a beverage supply apparatus according to a first embodiment of the present invention, and schematically shows a syrup supply line for delivering syrup as a liquid ingredient by a beverage dispenser. The syrup supply line includes a carbon dioxide cylinder 1 containing high-pressure carbon dioxide, a syrup tank 2 containing syrup as a liquid raw material, a carbon dioxide supply line 3 for supplying carbon dioxide to the syrup tank, and a carbon dioxide supply line 3. A carbon dioxide gas regulating valve 4 provided in the chiller, a cooling coil 5 for cooling the syrup with cooling water (not shown), a syrup supply line 6 for sending out the syrup, and a constant volume flow rate adjustment for sending out the syrup at a constant volume. , A rotator drive motor 7A for driving a rotator (to be described later) that feeds syrup at a constant volume, and a syrup that opens and closes the syrup supply line 6. Pressure is detected by detecting the pressure on the upstream side of the solenoid valve 8, the multi-valve 9 that mixes liquids such as syrup, dilution water, and carbonated water, and the constant volume flow rate regulator 7. Based on the pressure detection signal, a pressure gauge 10A that outputs a pressure detection signal according to the pressure, a pressure gauge 10B that outputs a pressure detection signal according to the pressure. The carbon dioxide gas adjusting valve 4 or the rotor drive motor 7A is controlled by a delivery control unit 11 (delivery control means), a cooling water tank 50 for storing the cooling water W for cooling the cooling coil 5, and a cooling unit (not shown). The evaporator 51 that cools the cooling water W based on the vaporization of the refrigerant to be performed, and the refrigerant pipe 52 that circulates the refrigerant through the evaporator 51 are provided.
[0008]
The rotor drive motor 7A uses a direct current motor and is controlled by a sending control unit 11 based on PWM (Pulse Width Modulation) control for changing the rotation speed by changing the ratio (duty cycle) of the pulse width Hi and Low. Energization control is performed. Since PWM control is a well-known technique, detailed description thereof is omitted.
[0009]
The evaporator 51 evaporates the liquid refrigerant supplied via the refrigerant pipe 52 to form ice 53 on the surface, and cools the cooling water W based on the ice 53.
[0010]
FIG. 2 shows a constant volume flow rate regulator (hereinafter referred to as a flow rate regulator) 7, FIG. 2 (a) is a state seen from the plane direction, FIG. 2 (b) is a state seen from the side surface direction, FIG. (C) is the state which looked at the cross section in the AA part of FIG.2 (b) in the arrow direction. The flow rate regulator 7 includes a main body 12 having an inflow portion 12a into which syrup flows in and an outflow portion 12b from which syrup flows out, a speed reducer 13 fixed to the upper portion of the main body 12 with a screw or the like, and a speed reducer 13 A rotor drive motor 7A fixed to the main body 12, a lid portion 14 fixed to the lower portion of the main body 12, and a set of circular gears 15 (rotors) provided inside the main body 12. Yes. The pair of circular gears 15 is rotatably supported by shafts 16 (drive side) and 17 (driven side) supported by the main body 12 and the lid portion 14, and the shaft 16 is rotated via the speed reducer 13. It rotates in the direction of the arrow by being driven by being connected to the rotation shaft of the child drive motor 7A.
[0011]
The flow rate regulator 7 also detects the rotational speed of the circular gear 15 (rotational speed of the rotor driving motor 7A that is connected to the shaft 16 via the speed reducer 13) and detects the rotational speed of the rotor driving motor 7A. A magnet encoder (hereinafter referred to as an encoder) (not shown) that outputs a pulse in conjunction with the rotation speed is included.
[0012]
FIG. 3 shows the amount of syrup discharged by driving the flow rate regulator 7. When the flow rate regulator 7 is stopped, the rotor drive motor 7A acts as a brake that prevents the circular gear 15 from rotating. Therefore, the pressure loss is larger than that of a normal flow regulator or flow meter, and the syrup discharge amount due to the pressure loss of the circular gear 15 is the syrup pushed out of the syrup tank 2 by the pressure of carbon dioxide supplied from the carbon dioxide cylinder 1. This is less than the syrup discharge amount of a flow regulator or a flow meter that discharges water. In FIG. 3, the portion where the syrup discharge amount of the flow rate regulator 7 is smaller than the syrup discharge amount of a normal flow regulator or flow meter is a decrease in the syrup discharge amount due to the pressure loss of the circular gear 15, and the rotor drive motor 7A. The force required to drive the circular gear 15 becomes smaller as the pressure for pushing out the syrup is added by the pressure of carbon dioxide. Further, in a portion where the syrup discharge amount of the flow rate regulator 7 is larger than the syrup discharge amount of a normal flow regulator or syrup flow meter, the rotor drive motor 7A uses a circular shape to drive the syrup pushed out of the syrup tank 2 by the pressure of carbon dioxide gas. The rotor drive motor 7A drives the circular gear 15 by the amount of syrup discharge increased by driving the gear 15 and by the amount by which the syrup is pushed out of the syrup tank 2 by the pressure of carbon dioxide gas. The force required for this is reduced.
[0013]
FIG. 4 shows a control block of the syrup supply line in the first embodiment. The reference numerals correspond to those in FIGS. 1 and 2, and a pulse corresponding to the rotational speed of the rotor drive motor 7A is output. Encoder 18, input device 23 having a keyboard or the like for inputting various setting values for control, a plurality of beverage selection sales switches 24 provided on the front surface of the beverage supply device, and control of each part of the beverage supply device It has a memory 25 for storing data, a timer 26 for measuring time such as a syrup supply time, and a main control unit 27 for controlling the above-described units. The main control unit 27 has the above-described delivery control unit 11 that controls the rotor drive motor 7A based on the pressure detection signal described above.
[0014]
The sales switch 24 is assigned a syrup number, a sales amount (cup size large, medium, small), carbonation (carbonated beverage, weak carbonated beverage, non-carbonated beverage), and the like. The main control unit 27 supplies power from the delivery control unit 11 to the rotor drive motor 7A based on the voltage or current value stored for each beverage in the memory 25. Moreover, the setting value input by the input device 23 is displayed on a display unit (not shown) as necessary.
[0015]
The memory 25 stores data such as the driving time of the rotor driving motor 7A set for each beverage, the duty ratio according to the power, and the delay time for delaying the start of driving of the rotor driving motor 7A. Also, a duty correction table for correcting the duty ratio of the rotor drive motor 7A at an arbitrary syrup temperature based on the viscosity at the reference temperature (for example, 5 ° C.) of the syrup, based on the relationship between the pressure and the flow rate at the time of sending the syrup. A flow rate correction value provided for each type of syrup and a pressurization amount correction table for changing the opening / closing amount of the carbon dioxide gas adjusting valve 4 by an adjustment amount corresponding to the degree of pressure are stored.
[0016]
When sending the syrup at a constant flow rate, the main control unit 27 compares the pulse frequency output from the encoder 18 with the reference pulse frequency stored in the memory 25 for each syrup or each beverage at a certain time t. When the pulse frequency output from the encoder 18 is lower than the reference pulse frequency, the rotational speed of the rotor drive motor 7A is increased by changing the duty ratio. When the number of pulses output from the encoder 18 is greater than the reference pulse frequency, the rotational speed of the rotor drive motor 7A is reduced by changing the duty ratio. In this way, the rotational speed of the rotor drive motor 7A is controlled so as to be the same as the reference pulse frequency stored in the memory 25 in advance.
[0017]
Further, the main control unit 27 inputs pressure detection signals output from the pressure gauges 10 </ b> A and 10 </ b> B to the transmission control unit 11. The delivery control unit 11 adjusts the opening degree of the carbon dioxide gas regulating valve 4 based on the pressure detection signals of the pressure gauges 10A and 10B. Further, the delivery control unit 11 changes the duty ratio of the rotor drive motor 7A based on the pressure detection signals of the pressure gauges 10A and 10B.
[0018]
When the set of circular gears 15 is rotated, the flow rate regulator 7 is pushed out of the syrup tank 2 by the pressure of carbon dioxide supplied from the carbon dioxide cylinder 1 through the carbon dioxide supply line 3, and from the inflow portion 12 a to the main body. The syrup flowing into the inside of the body 12 is held in a space B formed between the teeth of the circular gear 15 and the inner wall of the main body 12 and moved along the inner wall of the main body 12. As a result, the syrup reaches the outflow portion 12b and flows out from the outflow portion 12b.
[0019]
Next, the syrup supply operation of the beverage supply device according to the first embodiment will be described.
[0020]
The main control unit 27 inputs a sales signal based on the purchaser selecting a beverage and pressing the sales switch 24. The main control unit 27 outputs an energization signal to the transmission control unit 11 based on the input of the sales signal. When the energization signal is input, the delivery controller 11 supplies power to the rotor drive motor 7A and the syrup solenoid valve 8. The syrup solenoid valve 8 opens the syrup supply line 6 based on the supply of electric power. By opening the syrup solenoid valve 8, the syrup pressurized by the carbon dioxide gas from the syrup tank 2 is sent to the syrup supply line 6, cooled by the cooling coil 5, and flows into the flow rate regulator 7. The rotor drive motor 7A drives the flow rate regulator 7 to send syrup to the multi-valve 9 at a constant volume.
[0021]
The sending control unit 11 supplies power to the rotor drive motor 7A based on the duty ratio stored in the memory 25. The delivery control unit 11 supplies power to the rotor drive motor 7A with a duty ratio of 100% until a predetermined time (for example, 100 m / s) has elapsed from the start of the drive of the rotor drive motor 7A. Power is supplied at a duty ratio set for each time. This fixed time is set based on the physical properties such as the viscosity of the liquid to be delivered and the electrical characteristics of the rotor drive motor 7A. When the pulse frequency output from the encoder 18 deviates from the reference pulse frequency, the rotational speed is controlled based on the duty ratio changing operation described above.
[0022]
The pressure gauges 10 </ b> A and 10 </ b> B output a pressure detection signal corresponding to the pressure of the syrup supply line 6 that sends out the syrup to the delivery control unit 11. When the pressure detection signal indicating negative pressure is input from the pressure gauge 10A, the delivery control unit 11 reads the flow rate correction value stored in the memory 25, and the rotator so that the desired flow rate is obtained from the flow rate according to the pressure. The carbon dioxide gas adjusting valve 4 is opened so that the opening degree is adjusted according to the degree of pressure based on the pressurization amount correction table stored in the memory 25 while correcting the duty of the drive motor 7A and the reference pulse frequency of the encoder 18. Increase the amount of syrup pressure.
[0023]
Moreover, when the pressure detection signal exceeding the normal pressure range is input from the pressure gauge 10B, the delivery control unit 11 adjusts the carbon dioxide adjustment valve 4 so as to reduce the supply pressure of the carbon dioxide, and the duty of the rotor drive motor 7A. Change the ratio to slow down.
[0024]
FIG. 5 shows syrup delivery characteristics when the pressure of carbon dioxide gas supplied to the syrup tank 14 is set to 0.15 MPa, and the number of pulses output according to the rotational speed (motor speed) of the rotor drive motor 7A. The flow rate on the outflow side of the flow rate regulator 7 is shown. When the pressure of carbon dioxide gas was first set to 0.10 MPa at the start of syrup supply, the pressure gauge 10A showed a negative pressure, and the pulse number (wave line A) and flow rate (wave line B) of the encoder 18 varied. Therefore, the delivery control unit 11 sets the opening degree of the carbon dioxide gas regulating valve 4 to 0.15 MPa by increasing it based on the adjustment amount obtained from the pressurization amount correction table. Under this pressurizing condition, the pressure on the inflow side of the flow rate regulator 7 is improved to a positive pressure as shown in (a), and even if the rotational speed is increased, the pressure is maintained at the positive pressure at the inflow portion and the outflow portion. I'm leaning. Under this pressure condition, the syrup pressurized with carbon dioxide gas continuously flows into the flow rate regulator 7, so that the flow rate is maintained even when the rotational speed of the rotor drive motor 7 </ b> A increases as shown in FIG. There is no variation.
[0025]
In the liquid delivery control using the flow rate regulator 7, when the circular gear 15 is driven at a rotational speed according to the beverage dilution ratio and viscosity, the voltage or current value supplied to the rotor drive motor 7A is tabulated. In addition to storing in the memory 25, time data representing intervals at which the voltage supplied to the rotor drive motor 7A is intermittently turned on / off is tabulated for each beverage and stored in the memory 25, and an appropriate control mode is stored. May be selectively executed.
[0026]
When performing liquid delivery control with higher accuracy, the state of the liquid in each line is detected by a detector such as a pressure gauge or a liquid sensor that detects the presence or absence of liquid, and delivery control including these detection signals is performed. It is preferable that the liquid flows continuously into the flow rate regulator 7 without stagnation.
[0027]
FIG. 6 shows the relationship between the temperature and the viscosity of the syrup, and the syrup has a characteristic that the viscosity changes depending on the temperature. In the syrup used in the present embodiment, the viscosity of about 38 cp at 30 ° C. is as high as 65 cp at 5 ° C. When the viscosity increases, the pressure loss in the syrup supply line 6 increases and the pressure increases. For this reason, if the flow rate setting operation of the flow rate regulator 7 is performed immediately after installing the beverage dispenser, the flow rate fluctuation based on the temperature dependence of the viscosity described above may occur due to the difference from the syrup temperature at the time of actual sales. is there.
[0028]
For example, when the service person performs the flow rate setting operation of the flow rate regulator 7 after installing the beverage dispenser, the cooling water W in the cooling water tank 50 is not sufficiently cooled immediately after the installation, so the temperature of the syrup that has passed through the cooling coil 5 is It is larger than the appropriate temperature (for example, 5 ° C.) at the time of actual sales, and the viscosity becomes small. When the flow rate setting operation is performed at the syrup temperature, the syrup flow rate is increased by 10 to 15% as compared with the syrup flow rate at the appropriate temperature.
[0029]
From this, the pressure of the syrup supply line 6 is monitored by the pressure gauges 10A and 10B so that a desired flow rate can be obtained when the syrup reaches an appropriate temperature, and the obtained pressure detection signal and the appropriate temperature measured in advance are monitored. It is preferable to perform the duty ratio variable control and the pressurization amount control of the rotor drive motor 7A in consideration of the temperature detection signal at, and further considering the temperature difference of the syrup.
[0030]
In this embodiment, the syrup is pressurized and supplied with carbon dioxide gas. However, if a gas break occurs when the carbon dioxide gas dissolved in the syrup comes into contact with the circular gear 15, the amount of syrup inflow is reduced. Therefore, the rotational speed of the rotor drive motor 7A is controlled based on the pressure detection signal of the pressure gauge 10A. Further, the amount of pressurization of the syrup may be increased or decreased by adjusting the opening of the carbon dioxide adjusting valve 4 provided in the carbon dioxide supply line 3 without changing the rotational speed of the rotor drive motor 7A. The rotation speed of the motor and the opening adjustment of the carbon dioxide gas adjusting valve 4 may be adjusted together.
[0031]
The drive control of the rotor drive motor 7A includes, for example, a resistance control method in which a voltage regulator composed of a transistor or a variable resistor is provided in the sending control unit 11 of the main control unit 27 to change the voltage. Further, as a method of changing the interval at which the voltage supplied to the rotor drive motor 7A is intermittently turned on / off, for example, there is a pulse control method. Since the pulse control method repeats either the on state or the off state, there is no power loss in the off time, and the control transistor is completely saturated even in the on time, so that the power loss is reduced.
[0032]
According to the first embodiment described above, the flow rate regulator 7 is controlled by monitoring the pressure so that the inflow side pressure of the flow rate regulator 7 provided in the syrup supply line 6 does not become a negative pressure. Therefore, it is possible to prevent the syrup inflow amount from becoming insufficient and to continuously and reliably send out the syrup having a desired flow rate and a constant volume. Further, by sending the liquid based on the rotation of the pair of circular gears 15, it is possible to send the liquid with high accuracy without being affected by physical properties such as the viscosity of the liquid.
[0033]
Further, since the syrup pressurized with carbon dioxide gas is fed into the flow rate regulator 7 through the syrup supply line 6, the syrup does not flow backward to the syrup tank 2 side, and the rotor drive motor 7A has a set of circular shapes. The force required to drive the gear 15 is reduced by the pressurization of carbon dioxide gas, so that the rotor drive motor 7A can be reduced in size, and the apparatus cost can be reduced. Further, by changing the rotation of the set of circular gears 15, the amount of syrup delivered can be increased or decreased according to the required flow rate.
[0034]
Further, the pressure of the syrup supply line 6 is monitored by the pressure gauges 10A and 10B, and the duty ratio variable control and the pressurization amount control of the rotor drive motor 7A with reference to the pressure at an appropriate temperature are performed, whereby the syrup viscosity fluctuations. Therefore, it is possible to prevent the flow rate fluctuation associated with the syrup and send the syrup with high accuracy.
[0035]
Further, the configuration in which the delivery control unit 11 sets the flow rate based on the pressure detection signals of the pressure gauges 10A and 10B has been described. For example, referring to the pressure detection values by the pressure gauges 10A and 10B, a serviceman or the like The flow setting operation or the flow adjustment operation may be performed manually.
[0036]
FIG. 7 shows another embodiment of a set of rotors incorporated in the flow rate regulator 7. In addition to the circular gear 15, the triangular rice ball-shaped gear 15A shown in FIG. An oval gear 15B shown in FIG. 5B, an eyebrow type rotor 15C shown in FIG. 5C, and a crowbar type rotor 15D shown in FIG. The eyebrows-type rotor 15C and the clover-type rotor 15D are formed with a smooth outer periphery, and the eyebrows-type rotor 15C relatively rotates based on the engagement of the gear 15c attached to the shafts 16 and 17. Thus, the liquid delivery performance can be varied depending on the shape of the pair of rotors accommodated in the main body 12. In this case, since the pressure loss in the liquid pipe changes depending on the shape of the rotor, it is preferable to use a set of rotors according to physical properties such as the density and viscosity of the liquid to be delivered. Further, in the triangular rice ball-shaped gear 15A and the oval gear 15B, the pressure transmitted through the liquid effectively acts as an external force that promotes the rotation of the rotor, so that the pressure loss is reduced even when the viscosity of the liquid is large. Can be planned.
[0037]
In the first embodiment, the syrup delivery control in the beverage supply device has been described. However, the use thereof is not limited to the beverage supply device, and delivery of a liquid other than the syrup, for example, a pressurized liquid such as oil. It is also possible to apply to control. Further, it can be applied to delivery control when pressurizing and sending powder or gas in addition to liquid via piping, and delivery control when supplying liquid or powder by dropping or the like based on gravity. .
[0038]
Various modifications can be made to the configuration of each part. For example, the syrup solenoid valve 8 is used as a valve device for supplying syrup to the multi-valve 9, but the present invention is not limited to this, and the supply of syrup may be controlled by opening and closing the valve by an electric motor. As for the supply form of syrup, for example, a bag is filled with syrup, and a liquid raw material container (back-in box) in which the bag is stored in a transport box is installed in the beverage supply device, and the weight of the syrup itself is set. It is also possible to supply the flow rate regulator 7, continuously send out a fixed volume of syrup by the flow rate regulator 7, and supply the syrup to the multi-valve 9 via the syrup solenoid valve 8.
[0039]
FIG. 8 shows another flow rate regulator according to the second embodiment, which is a vane type flow rate regulator 40 in which a plurality of vanes are provided radially on a rotating body that is rotationally driven by a motor. The vane type flow controller 40 includes a main body 41, an elliptical liquid container 42 formed in the main body 41, a rotating body 43 that is rotationally driven by a motor (not shown) in the main body 41, and a rotation A plurality of vanes 44 provided radially on the body 43, and a vane housing groove 45 that holds the vanes 44 so as to be expandable and contractable in the radial direction of the rotating body 43. The syrup is introduced into the space formed through the inflow pipe 6A, and the syrup is caused to flow out of the outflow pipe 6B based on the rotation of the rotating body 43.
[0040]
The vane 44 is urged so as to be in close contact with the inner wall of the liquid storage portion 42 by an elastic member such as a spring (not shown) stored in the vane storage groove 45, and the expansion / contraction amount is maximum at the large diameter portion of the ellipse, Minimum at the small diameter part.
[0041]
The syrup delivery operation by the vane-type flow regulator 40 is performed by causing the syrup to flow from the syrup supply line 6 through the inflow pipe 6A into the liquid container 42 and rotating the rotating body 43 in the direction of the arrow shown in the figure. A fixed volume of syrup is accommodated between the body 43, the two vanes 44, and the inner wall of the liquid storage portion 42, and is moved based on the rotation of the rotating body 43 to flow out from the outflow pipe 6 </ b> B. In the vane type flow controller 40, the syrup delivery operation is performed simultaneously on the left and right sides of the rotating body 43 shown in the drawing.
[0042]
According to the vane type flow regulator 40 according to the above-described third embodiment, the leakage of liquid due to the increase in gear backlash based on driving a set of rotors using gears is reduced, and the measurement accuracy is reduced. Without being generated, a constant volume of liquid can be supplied accurately and stably over a long period of time.
[0043]
According to the liquid delivery device of the present invention described above, the following operations and effects can be obtained.
(A) Since the syrup delivery is controlled so that the inflow portion of the flow rate regulator 7 does not become a negative pressure, for example, the syrup supply pressure fluctuates due to a decrease in the remaining amount of syrup in the syrup tank 2. However, it is possible to continuously flow the syrup into the flow rate regulator 7, so that a fixed volume of syrup can be sent out accurately and stably from the flow rate regulator 7.
[0044]
(B) At least the inflow portion of the flow rate regulator 7 is monitored by a pressure detector, and when the inflow portion becomes negative pressure, the carbon dioxide gas adjusting valve 4 provided in the carbon dioxide gas supply line 3 is opened to increase the amount of syrup pressurization. Therefore, the syrup flows continuously into the flow rate regulator 7 without stagnation.
[0045]
(C) At least the inflow portion of the flow rate regulator 7 is monitored by a pressure detector, and when the inflow portion becomes negative pressure, the rotational speed of the rotor drive motor 7A that drives the rotor is made variable. It is possible to prevent a negative pressure from being generated due to a phenomenon such as a gas break, and to secure the syrup inflow property to the flow rate regulator 7.
[0046]
(D) The rotor may be a set of rotors formed by combining a plurality of rotors, and a rotor having a shape corresponding to the liquid delivery can be selectively used.
[0047]
【The invention's effect】
As described above, according to the liquid delivery apparatus of the present invention, the pressure based on the flow according to the viscosity change of the pressurized liquid is monitored, and the delivery of a certain volume is controlled. The liquid to be delivered is always stably supplied without being affected by fluctuations and the like, and a constant volume of liquid with a desired flow rate can be delivered accurately and stably.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a beverage supply apparatus as a liquid delivery apparatus according to a first embodiment of the present invention.
FIGS. 2A and 2B show a constant displacement flow rate regulator according to a first embodiment, where FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a cross-sectional view taken along a line AA in FIG.
FIG. 3 is an explanatory diagram showing a liquid discharge amount of a liquid delivery line provided with a constant volume flow rate regulator in the first embodiment.
FIG. 4 is a control block diagram of the beverage supply device according to the first embodiment.
FIG. 5 is a characteristic diagram showing the relationship between the number of output pulses of the encoder and the flow rate, where (a) is characteristic data and (b) is the graph.
Fig. 6 Relationship between temperature and viscosity of syrup
FIGS. 7A to 7D are partial cross-sectional views showing another embodiment of a set of rotors built in a flow rate regulator; FIGS.
FIG. 8 is a schematic configuration diagram showing a vane type flow rate regulator according to a third embodiment of the present invention.
[Explanation of symbols]
1, carbon dioxide cylinder 2, syrup tank 3, carbon dioxide supply line
4, CO2 adjustment valve 5, cooling coil 6, syrup supply line
6A, inflow pipe 6B, outflow pipe 7A, rotor drive motor
7, constant volume flow regulator 8, syrup solenoid valve 9, multi-valve
10A, pressure gauge 10B, pressure gauge 11, delivery control unit
12, body 12a, inflow part 12b, outflow part 13, speed reducer
14, lid part 15, circular gear 15A, triangular rice ball circular gear
15B, oval gear 15C, eyebrows type rotor
15D, clover type rotor 15c, gear 16, shaft
17, shaft 18, encoder 23, input device
24, sales switch 25, memory 26, timer
27, main control unit 40, vane type flow regulator 41, main body
42, liquid container 43, rotating body 44, vane
45, vane accommodation groove 50, cooling water tank 51, evaporator
52, refrigerant line 53, ice

Claims (6)

Delivery means for delivering the pressurized liquid flowing in from the inflow part to the outflow part in a constant volume amount;
And transmission control means for sending a flow desired in accordance with the pressure of the pressurized liquid at a constant volumetric amount,
A first pressure detector that outputs a first pressure detection signal corresponding to the pressure of the pressurized liquid in the inflow portion;
A pressurization amount adjuster that varies the pressurization amount of the pressurized liquid based on the first pressure detection signal;
A second pressure detector that outputs a second pressure detection signal corresponding to the pressure of the pressurized liquid in the outflow portion;
A drive controller that varies a delivery amount of the delivery means based on the second pressure detection signal;
When the pressure detection signal indicating the negative pressure of the inflow portion is input from the first pressure detector, the delivery control means is provided to the pressurization amount regulator so that the pressure of the inflow portion does not become a negative pressure. When a signal for increasing the amount of pressurization is output and a pressure detection signal exceeding a predetermined pressure range is input from the second pressure detector, a signal for reducing the amount of output of the output means is supplied to the drive controller. liquid delivery device and outputs.   The delivery means is rotatably accommodated in a main body provided with the inflow portion and the outflow portion for the pressurized liquid, and is driven to rotate within the main body, whereby the addition means that flows into the main body from the inflow portion. 2. The liquid delivery apparatus according to claim 1, wherein the liquid delivery apparatus is a constant volume liquid delivery device having a rotor for delivering pressurized liquid from the outflow part with a constant volume. The pressurization amount adjuster includes a carbon dioxide supply device that supplies carbon dioxide gas for liquid delivery to a liquid storage unit that stores liquid, and a carbon dioxide gas adjustment valve that adjusts the supply amount of carbon dioxide gas to the liquid storage unit. Have
The carbon dioxide gas regulating valve, the first pressure detection signal fluid delivery device as in claim 1, wherein said to be controlled to adjust the amount corresponding to the desired to pressurization based on. The first and second pressure detectors compare the pressure detection signal according to the viscosity change of the pressurized liquid with the pressure detection signal according to the viscosity at the reference temperature of the pressurized liquid, and the fluid delivery device as in claim 1 wherein characterized in that it comprises a control unit for calculating the flow correction value to the flow rate. The rotor is a set of gear rotors housed in the body;
The set of gear rotors is driven to rotate a predetermined amount of the pressurized liquid flowing between the main body and the gear from the inflow portion by being rotationally driven in opposite directions within the main body. The liquid delivery apparatus according to claim 2 , wherein the liquid delivery apparatus delivers the liquid to the outflow portion. The rotor is a vane-type rotor housed in the body;
The vane-type rotor sends out a certain amount of the pressurized liquid flowing from the inflow portion into a space sandwiched between the main body and two vanes to the outflow portion based on rotational driving. Item 2. A liquid delivery device according to item 2 .

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