CN111557596A - Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method - Google Patents

Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method Download PDF

Info

Publication number
CN111557596A
CN111557596A CN202010358739.5A CN202010358739A CN111557596A CN 111557596 A CN111557596 A CN 111557596A CN 202010358739 A CN202010358739 A CN 202010358739A CN 111557596 A CN111557596 A CN 111557596A
Authority
CN
China
Prior art keywords
pressure
water pump
water
coffee
brewing kettle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010358739.5A
Other languages
Chinese (zh)
Inventor
郭瑞
郭以恒
段丽敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010358739.5A priority Critical patent/CN111557596A/en
Publication of CN111557596A publication Critical patent/CN111557596A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
    • A47J31/36—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/52—Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus ; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/52—Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus ; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus
    • A47J31/525—Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus ; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus the electronic control being based on monitoring of specific process parameters
    • A47J31/5251—Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus ; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus the electronic control being based on monitoring of specific process parameters of pressure
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/58—Safety devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

The invention relates to a pump pressure type coffee machine brewing kettle with a pressure control function and a pressure control method, which can directly measure and control the absolute pressure in the brewing kettle which directly influences the coffee quality so as to realize the control of the coffee quality, and comprises a coffee machine shell, a water pipe, a water tank, a hot water boiler, a high-pressure water pump, a base, a hot water spray nozzle and a brewing kettle; the coffee machine shell is arranged on the base, the water tank is arranged on the coffee machine shell, and the water pipe, the hot water boiler and the high-pressure water pump are all arranged in the coffee machine shell; one end of the water pipe is communicated with the water tank through a hot water boiler and a high-pressure water pump; the other end of the water pipe is communicated with a hot water spray head, the hot water spray head is arranged on the shell of the coffee machine, the brewing kettle is also arranged on the shell of the coffee machine and is arranged on the hot water spray head, and a coffee outlet is arranged on the brewing kettle; the method is characterized in that: the system also comprises an absolute pressure sensor, a pressure sensor data acquisition and processing unit, a water pump bypass and a water pump bypass electromagnetic valve.

Description

Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method
Technical Field
The invention relates to a pumping pressure type coffee machine brewing kettle with a pressure control function and a pressure control method.
Background
Coffee is a beverage prepared by cooking roasted and ground coffee beans as a raw material with water. Coffee beans contain about 100 different substances including caffeine, tannic acid, oil and nitrogen compounds, and are made with various cooking utensils and methods to have different flavors.
Espresso is a method of making coffee, which is known by its origin in italy and is produced mainly by the rapid passage of water or water vapour at high temperature and pressure through coffee powder. Besides extracting water-soluble substances in the coffee powder, high-pressure water can further extract non-water-soluble substances, and lipid in the coffee powder can be completely emulsified and dissolved in water to generate special flavor.
The coffee machine mainly used for the espresso coffee method is a pump type coffee machine, which is a common device for making espresso coffee.
The basic principle of operation will now be described with reference to fig. 1; FIG. 1 shows a coffee maker housing; 2 is a water pipe; 3 is a water tank; 4 is a hot water boiler; 5 is a high-pressure water pump; 6 is a base; 7 is a hot water spray head; 8 is a brewing kettle; 9 is coffee powder; 10 is a coffee outlet. The brewing kettle 8 is a detachable component, is detached before manufacture, is filled with a certain amount of coffee powder, is pressed and flattened by a flat shovel-shaped tool, is connected with the coffee machine body through a screw joint, and is positioned right below the hot water spray nozzle 7. The hot water spray head 7 is provided with honeycomb-shaped openings so as to form uniform hot water flow conveniently. When the coffee machine is started, the hot water boiler 4 is preheated to a certain temperature, then the high-pressure water pump 5 is started, the high-pressure water pump 5 pumps cold water from the water tank 3, the cold water is heated by the hot water boiler 4 after being pressurized, hot water is sprayed into the brewing kettle 8 from the hot water spray head 7 through the water pipe 2, the high-pressure hot water flows through coffee powder in the brewing kettle, and substances such as grease, caffeine and the like in extraction flow out from the coffee outlet 10. Wherein, the pressure of the water in the brewing kettle 8 directly influences the extraction degree of the effective substances in the coffee powder, and is an important factor influencing the flavor of the espresso coffee.
According to the fluid mechanics principle, the runner system of the Italian coffee maker can be divided into a flow system consisting of a high-pressure water pump, a hot water boiler, a hot water spray nozzle, a brewing kettle and water pipes connected with the brewing kettle, wherein the high-pressure water pump provides pressure, and the hot water boiler, the hot water spray nozzle, the brewing kettle and the water pipes connected with all parts form a pipeline system, so that the runner system has self resistance characteristics and comprises two categories of on-way resistance and local resistance. The pressure in the brewing kettle is the result of the balance between the pressure provided by the high-pressure water pump and the resistance of the pipeline system, and the outlet pressure of the high-pressure water pump and the resistance of the pipeline system are not constant and have a certain functional relation with the flow.
For a high-pressure water pump, the pressure and the flow generated by the water pump have a certain functional relationship, which is called as the pressure and flow characteristics of the pump, and the formed functional curve is called as the pressure and flow curve. Taking a typical vane pump as an example for analysis, the pump outlet pressure (in meters) HT is related to the flow qvT by:
Figure BDA0002474332700000021
it can also be abbreviated as:
HT＝A-BqVT(2)
in the formula
Figure BDA0002474332700000022
Wherein u2 is the tangential velocity of the fluid outlet blade, and is related to the impeller rotating speed and the impeller diameter, g is the gravity acceleration, D2 is the impeller diameter, b2 is the impeller width, beta 2y is the impeller installation angle, ctg is the symbol of the angle cotangent value, psi is the blade shape coefficient, and pi is the circumferential ratio.
g. Pi is a constant; d2, b2 and beta 2y are structural parameters of the impeller and are also constants; u2 is also constant for the same pump speed.
Therefore, as can be seen from equation (2), if a two-dimensional rectangular coordinate system is formed by taking the pressure HT as the vertical axis and the flow rate qvT as the horizontal axis, the pressure and the flow rate of the pump are a straight line with negative curvature, i.e., the pressure decreases with the increase of the flow rate and increases with the decrease of the flow rate.
For a piping system, the pipe resistance Hc is:
Figure BDA0002474332700000031
wherein Hst is the height difference from the pump outlet to the position in the pipeline system,
Figure BDA0002474332700000032
the resistance coefficient in the pipeline comprises an on-way resistance coefficient and a local resistance coefficient, the on-way resistance coefficient is mainly related to the diameter, the roughness and the length of the pipeline, the local resistance coefficient is related to resistance elements comprising various elbows such as right angles and reducing angles, a throttling orifice plate and the like, and qv is the flow of the system.
It can be seen from the above equation that the overcome pipeline resistance is a quadratic function of the flow rate, and the slope is positive, i.e. the higher the flow rate, the higher the pressure required. If a two-dimensional rectangular coordinate system is formed by taking the pressure Hc as a vertical axis and the flow qv as a horizontal axis, the relationship between the pressure and the flow required for overcoming the resistance of the pipeline as a quadratic function is a quadratic curve.
Generally, the pressure-flow curve of the pump and the resistance-flow curve of the pipe can be drawn in a coordinate system, the pressure and the flow are uniformly expressed in the coordinate system, the vertical axis is the pressure H, and the horizontal axis is the flow qv, so in the flow channel system formed by the pump and the pipe, the intersection point of the pipe and the pressure-flow characteristic curve of the pump is the working point in the pipe, corresponding to the pressure and the flow in the pipe, i.e. the pressure and the flow in the brewing kettle in this case.
For a flow channel system in a coffee machine, the characteristics of the high-pressure water pump are determined. In a pipeline system, the diameter, the roughness and the length of the inner wall of a water pipe are fixed, so that the on-way resistance coefficient is constant; the local resistance characteristic is mainly determined by the hot water spray head and the coffee powder in the brewing kettle, wherein the hot water spray head is provided with honeycomb-shaped openings, so that the hot water spray head is equivalent to a throttling orifice plate and is a throttling element, and larger local resistance can be caused, but the structure is certain, and the generated local resistance is also certain. In the brewing kettle, hot water flows through a plurality of layers of fine flow passages formed among coffee powder particles, and the layer number, the size and the shape of the flow passages are directly related to the quantity, the granularity and the compactness of the placed coffee powder during compaction, so that the local resistance of the coffee powder flowing through the flow passages is directly influenced.
Therefore, in summary, in the flow passage system of the coffee machine, the pressure-flow characteristic of the high-pressure water pump is constant, and the resistance characteristic of the pipe system is influenced by the coffee powder in the brewing kettle and changes with the change of the characteristic of the coffee powder. As shown in fig. 2, 1 is a flow-pressure curve of the water pump, 2 is a characteristic curve of the pipeline when the resistance coefficient is large, 3 is an intersection point of the curve 2 and the curve 1, which is the working point at this time, and correspondingly, the pressure and the flow at this time. And 4 is a pipeline characteristic curve when the resistance coefficient is small, 5 is an intersection point of the curve 3 and the curve 1, namely the working point at the moment, and correspondingly is the pressure and the flow at the moment.
If the flow channel area between the particles is reduced and the flow resistance is large due to the fine particle size and the tight pressure of the coffee powder in the brewing kettle, the characteristic curve is changed to be shown as curve 2, and the corresponding 3 points are working points. If the flow channel area between the particles is increased and the flow resistance is reduced due to the fact that the coffee powder in the brewing kettle is coarse in particle size, loose in compaction and the like, the pipeline characteristic is shown as a curve 4, and the corresponding 5 points are working points. It can be seen that the pressure at point 5 is lower than the pressure at point 4 and that the flow at point 5 is greater than the flow at point 4.
The design and manufacturing field of the existing coffee machine generally only uses the outlet pressure of a high-pressure pump as a design basis.
The pressure concept commonly used in engineering is essentially pressure intensity, and the physical meaning is the sum of vertical components of fluid molecular impact force on a unit area of a wall surface, namely:
Figure BDA0002474332700000041
where p is the pressure, A is the unit area, and F is the sum of the perpendicular components of the fluid molecular impact force. This value is the true pressure at the measured point, also known as the absolute pressure.
In actual measurement, there are two expression modes of absolute pressure and gauge pressure and two corresponding types of pressure sensors:
the sensor directly measures the stress of the environment where the sensitive element of the sensor is located, and then converts the stress into a pressure signal, and the absolute pressure of the measuring point is measured by the measuring mode;
the principle of the relative pressure sensor is explained by a mercury column type pressure gauge shown in figure 3 based on the force balance principle, wherein 1 is a U-shaped glass tube, and 2 is mercury. The right side of the U-shaped glass tube is connected with a part to be measured, and the left side of the U-shaped glass tube is communicated with the atmosphere. Then, according to the principle of force balance, when the mercury 2 in the U-shaped glass tube 1 keeps balanced, it means that the left side and the right side reach force balance, so there are:
pb+ρgh＝pr
(5)
where pb is atmospheric pressure, referred to as back pressure; rho is the density of the mercury column, g is the gravity acceleration, h is the height of the mercury column, and pr is the pressure on the right side of the U-shaped glass tube, namely the absolute pressure at the point to be measured.
Let pg＝ρgh
Indicating the pressure generated by the mercury column itself, and the formula can be rewritten as that generated for measuring the indication
pa＝pg+pb
(6)
I.e. the absolute pressure at the measurement point is the sum of the gauge pressure and the back pressure.
In engineering applications, the pressure at a measuring point is often characterized by gauge pressure due to the low price of the relative pressure type sensor.
Through analysis, the defects and shortcomings of the prior art are mainly reflected in that:
in the prior art, only the outlet pressure of a high-pressure pump is considered, on one hand, the throttling effect of a hot water nozzle is not generated, and the outlet pressure of the high-pressure pump is different from the pressure of a brewing kettle; on the other hand, the pipeline characteristic is not considered, and when the quantity, the granularity and the compaction degree of the coffee powder are changed, the pressure in the brewing kettle is changed, so that the taste of the coffee is influenced; thirdly, when the coffee powder is too fine and compacted or the filter screen is blocked, the flow approaches zero, which causes the overhigh pressure in the brewing kettle, influences the service life of the sealing gasket between the brewing kettle and the coffee machine body, even causes the failure of the sealing gasket by directly jetting high-pressure water out of the sealing gasket, and causes the damage of the internal pipeline in serious conditions, thus causing safety accidents such as pipeline explosion, injury of people by hot water and the like;
the traditional technology adopts gauge pressure as a pressure reference without considering the influence of atmospheric pressure, and the atmospheric pressure is related to the altitude of a place where the atmospheric pressure is located and the weather, and the higher the altitude is, the lower the atmospheric pressure is; the atmospheric pressure at the same location will also vary with weather conditions. As can be seen from equation (6), even though the measured gauge pressure pg indicates no change, if pb changes, the absolute pressure at the measurement point will be different, resulting in a change in the flavor of the coffee.
In summary, the current pump type coffee machine cannot directly measure and control the absolute pressure in the brewing kettle which directly affects the quality of coffee.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art, and provides a pumping pressure type coffee machine brewing kettle with a pressure control function and a pressure control method, which can directly measure and control the absolute pressure in the brewing kettle which directly influences the coffee quality, thereby realizing the control of the coffee quality.
In order to solve the technical problems, the invention provides the following technical scheme: a pump pressure type coffee machine brewing kettle with a pressure control function comprises a coffee machine shell, a water pipe, a water tank, a hot water boiler, a high-pressure water pump, a base, a hot water spray head and a brewing kettle; the coffee machine shell is arranged on the base, the water tank is arranged on the coffee machine shell, and the water pipe, the hot water boiler and the high-pressure water pump are all arranged in the coffee machine shell; one end of the water pipe is communicated with the water tank through a hot water boiler and a high-pressure water pump; the other end of the water pipe is communicated with a hot water spray head, the hot water spray head is arranged on the shell of the coffee machine, the brewing kettle is also arranged on the shell of the coffee machine and is arranged on the hot water spray head, and a coffee outlet is arranged on the brewing kettle; the method is characterized in that: the system also comprises an absolute pressure sensor, a pressure sensor data acquisition and processing unit, a water pump bypass and a water pump bypass electromagnetic valve; the absolute pressure sensor is arranged beside the hot water spray head and positioned in the brewing kettle, and the pressure sensor data acquisition and processing unit, the water pump bypass and the water pump bypass electromagnetic valve are all arranged in the coffee machine shell; absolute pressure sensor is connected with pressure sensor data acquisition and processing unit electricity, the one end and the water piping connection of water pump bypass just are located between boiler and the high pressure water pump, the other end of water pump bypass also with water piping connection and be located between high pressure water pump and the water tank, water pump bypass solenoid valve establishes on the water pump bypass, water pump bypass solenoid valve is connected with pressure sensor data acquisition and processing unit electricity.
In order to solve the technical problems, the invention provides the following technical scheme: a brewing method of a brewing kettle of a pump pressure type coffee machine comprises the following steps:
the method comprises the following steps: when the coffee machine is in a working state, the water pump bypass electromagnetic valve is in a default closing state, the high-pressure water pump starts to work, water is pumped into the hot water boiler to be heated and then flows into the brewing kettle through the hot water nozzle, and the water flows out from a coffee outlet at the lower part of the brewing kettle to form coffee;
step two: the absolute pressure sensor measures the absolute pressure in the brewing kettle, and the absolute pressure is compared with a built-in setting value after data is acquired by the pressure sensor data acquisition and processing unit;
step three: when the measured value is larger than the setting value, the pressure sensor data acquisition and processing unit sends a trigger signal to open the water pump bypass electromagnetic valve, and at the moment, part of water at the outlet of the high-pressure water pump flows back to the inlet of the high-pressure water pump through the water pump bypass, so that the pressure in the brewing kettle is reduced.
Step four: when the absolute pressure sensor measures that the absolute pressure in the brewing kettle is lower than a setting value, the pressure sensor data acquisition and processing unit sends a trigger signal to close the water pump bypass electromagnetic valve, and the pressure in the brewing kettle rises
The invention has the beneficial effects that: the pump pressure type coffee machine brewing kettle with the pressure control function and the pressure control method directly measure and control the absolute pressure in the brewing kettle which directly influences the coffee quality through the technology, on one hand, the influence of factors such as the quantity, the thickness and the granularity of coffee powder, resistance change caused by compression strength and the like on the pressure in the brewing kettle is avoided, the consistency of coffee flavor is favorably kept, on the other hand, the pressure of the brewing kettle is controlled to be stable, the overpressure is avoided, the service life of a sealing gasket between the brewing kettle and a coffee machine body can be prolonged, and the potential safety hazards that pipelines burst and hot water injure people are eliminated.
The invention adopts absolute pressure as a measuring and controlling signal, and has the advantages that the measured pressure is not influenced by atmospheric pressure change, and the numerical values are kept consistent under different altitudes and different weather conditions, thereby being beneficial to controlling the consistency of coffee quality.
Drawings
FIG. 1 is a schematic view of a pump coffee maker of the prior art;
FIG. 2 is a schematic illustration of a graph of influence factors in a flow passage system of a coffee maker;
FIG. 3 is a schematic diagram of the operating principle of a mercury column type pressure gauge;
fig. 4 is a schematic view of the pump type coffee maker of the present invention.
Description of the drawings: 1. a coffee machine housing; 2. a water pipe; 3. a water tank; 4. a hot water boiler; 5. a high pressure water pump; 6. a base; 7. a hot water spray head; 8. a brewing kettle; 9. coffee powder; 10. a coffee outlet; 11. an absolute pressure sensor; 12. the pressure sensor data acquisition and processing unit; 13. a water pump bypass; 14. the water pump bypasses the electromagnetic valve.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A pump pressure type coffee machine brewing kettle with a pressure control function comprises a coffee machine shell 1, a water pipe 2, a water tank 3, a hot water boiler 4, a high-pressure water pump 5, a base 6, a hot water spray head 7 and a brewing kettle 8; the coffee maker is characterized in that the coffee maker shell 1 is arranged on the base 6, the water tank 3 is arranged on the coffee maker shell 1, and the water pipe 2, the hot water boiler 4 and the high-pressure water pump 5 are all arranged in the coffee maker shell 1; one end of the water pipe 2 is communicated with the water tank 3 through a hot water boiler 4 and a high-pressure water pump 5; the other end of the water pipe 2 is communicated with a hot water spray head 7, the hot water spray head 7 is arranged on the coffee machine shell 1, the brewing kettle 8 is also arranged on the coffee machine shell 1 and is arranged on the hot water spray head 7, and a coffee outlet 10 is arranged on the brewing kettle 8; the method is characterized in that: the system also comprises an absolute pressure sensor 11, a pressure sensor data acquisition and processing unit 12, a water pump bypass 13 and a water pump bypass electromagnetic valve 14; the absolute pressure sensor 11 is arranged beside the hot water spray nozzle 7 and positioned in the brewing kettle 8, and the pressure sensor data acquisition and processing unit 12, the water pump bypass 13 and the water pump bypass electromagnetic valve 14 are all arranged in the coffee machine shell 1; absolute pressure sensor 11 is connected with pressure sensor data acquisition and processing unit 12 electricity, the one end and the water pipe 2 of water pump bypass 13 are connected and are located hot water boiler 4 and high pressure water pump 5 between, the other end of water pump bypass 13 also is connected with water pipe 2 and is located between high pressure water pump 5 and the water tank 3, water pump bypass solenoid valve 14 is established on water pump bypass 13, water pump bypass solenoid valve 14 is connected with pressure sensor data acquisition and processing unit 12 electricity.
A method of brewing the brewer kettle of a pump coffee machine according to claim 1, comprising the steps of:
the method comprises the following steps: when the coffee machine is in a working state, the water pump bypass electromagnetic valve 14 is in a default closing state, the high-pressure water pump 5 starts working, water is pumped into the hot water boiler 4 to be heated, then flows into the brewing kettle 8 through the hot water spray head 7, and flows out from the coffee outlet 10 at the lower part of the brewing kettle 8 to form coffee;
step two: the absolute pressure sensor 11 measures the absolute pressure in the brewing kettle 8, and the data is acquired by the pressure sensor data acquisition and processing unit 12 and then is compared with a built-in setting value;
step three: when the measured value is greater than the setting value, the pressure sensor data acquisition and processing unit 12 sends a trigger signal to open the water pump bypass electromagnetic valve 14, and at the moment, part of water at the outlet of the high-pressure water pump 5 flows back to the inlet of the high-pressure water pump 5 through the water pump bypass 13, so that the pressure in the brewing kettle 8 is reduced.
Step four: when the absolute pressure sensor 11 measures that the absolute pressure in the brewing kettle 8 is lower than the setting value, the pressure sensor data acquisition and processing unit 12 sends a trigger signal to close the water pump bypass electromagnetic valve 14, and the pressure in the brewing kettle 8 rises.
In specific implementation, the system for realizing the absolute pressure control method of the pump-type coffee machine brewing kettle comprises an absolute pressure sensor 11, a pressure sensor data acquisition and processing unit 12 and a water pump bypass 13; the water pump bypasses the solenoid valve 14. The system comprises the following components: the coffee maker comprises a coffee maker shell 1, a water pipe 2, a water tank 3, a hot water boiler 4, a high-pressure water pump 5, a base 6, a hot water spray head 7, a brewing kettle 8, coffee powder 9 and a coffee outlet 10.
The absolute pressure sensor 11 is installed near the hot water spray nozzle 7, and directly measures the absolute pressure in the brewing kettle 8 after the brewing kettle 8 is installed in place.
The pressure sensor data acquisition and processing unit 12 acquires data of the absolute pressure sensor 11, compares the data with a setting value, and can send out a signal according to the relative size of a measured value and the setting value.
The water pump bypass 13 is arranged between the outlet and the inlet of the high-pressure water pump 5, one path of the water pump bypass is connected with the outlet of the high-pressure water pump 5, and the other path of the water pump bypass is connected with the inlet of the high-pressure water pump;
the water pump bypass electromagnetic valve 14 is installed on the water pump bypass 13, and the switching signal of the water pump bypass electromagnetic valve is controlled by the pressure sensor data acquisition and processing unit 12.
When the power supply of the coffee machine is turned on, the hot water boiler 4 is preheated to a certain temperature, when the power supply of the high-pressure water pump 5 is turned on, cold water is pumped out from the water tank 3, and is heated by the hot water boiler 4 and then is pumped into the brewing kettle through the hot water spray head 7. The high pressure water passes through the compacted coffee grounds and exits the coffee outlet. After the hot water pumped by the high-pressure water pump and the outflow hot water reach balance, certain pressure is maintained in the brewing kettle.
The absolute pressure sensor 11 measures the absolute pressure in the brewing kettle 8.
If the pressure is higher than the setting value, the pressure sensor data acquisition and processing unit 12 controls the water pump bypass electromagnetic valve 14 to be opened, and part of water at the outlet of the high-pressure water pump 5 flows back to the inlet through the water pump bypass 13, so that the pressure in the brewing kettle 8 is reduced; and after the pressure is lower than the setting value, the pressure sensor data acquisition and processing unit 12 closes the water pump bypass electromagnetic valve 14, the flow rate of the water flowing into the brewing kettle 8 is increased, and the pressure rises again.
The absolute pressure of the brewing kettle is measured through the pressure sensor, the electromagnetic valve of the water pump bypass is controlled, the pressure in the brewing kettle can be kept stable, and therefore the coffee brewing kettle is beneficial to improving the quality of coffee.
The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (2)

1. A pump pressure type coffee machine brewing kettle with a pressure control function comprises a coffee machine shell (1), a water pipe (2), a water tank (3), a hot water boiler (4), a high-pressure water pump (5), a base (6), a hot water spray nozzle (7) and a brewing kettle (8); the coffee maker is characterized in that the coffee maker shell (1) is arranged on the base (6), the water tank (3) is arranged on the coffee maker shell (1), and the water pipe (2), the hot water boiler (4) and the high-pressure water pump (5) are all arranged in the coffee maker shell (1); one end of the water pipe (2) is communicated with the water tank (3) through a hot water boiler (4) and a high-pressure water pump (5); the other end of the water pipe (2) is communicated with a hot water spray head (7), the hot water spray head (7) is arranged on the coffee machine shell (1), the brewing kettle (8) is also arranged on the coffee machine shell (1) and arranged on the hot water spray head (7), and a coffee outlet (10) is arranged on the brewing kettle (8); the method is characterized in that: the system also comprises an absolute pressure sensor (11), a pressure sensor data acquisition and processing unit (12), a water pump bypass (13) and a water pump bypass electromagnetic valve (14); the absolute pressure sensor (11) is arranged beside the hot water spray head (7) and is positioned in the brewing kettle (8), and the pressure sensor data acquisition and processing unit (12), the water pump bypass (13) and the water pump bypass electromagnetic valve (14) are all arranged in the coffee machine shell (1); absolute pressure sensor (11) are connected with pressure sensor data acquisition and processing unit (12) electricity, the one end and water pipe (2) of water pump bypass (13) are connected and are located between boiler (4) and high pressure water pump (5), the other end of water pump bypass (13) also is connected with water pipe (2) and is located between high pressure water pump (5) and water tank (3), water pump bypass solenoid valve (14) are established on water pump bypass (13), water pump bypass solenoid valve (14) are connected with pressure sensor data acquisition and processing unit (12) electricity.
2. A method of brewing the brewer kettle of a pump coffee machine according to claim 1, wherein: the method comprises the following steps:
the method comprises the following steps: when the coffee machine is in a working state, the water pump bypass electromagnetic valve (14) is in a default closing state, the high-pressure water pump (5) starts to work, water is pumped into the hot water boiler (4) to be heated, then flows into the brewing kettle (8) through the hot water spray head (7), and flows out from the coffee outlet (10) at the lower part of the brewing kettle (8) to form coffee;
step two: the absolute pressure sensor (11) measures the absolute pressure in the brewing kettle (8), and the absolute pressure is compared with a built-in setting value after data is acquired by the pressure sensor data acquisition and processing unit (12);
step three: when the measured value is larger than the setting value, the pressure sensor data acquisition and processing unit (12) sends a trigger signal to open the water pump bypass electromagnetic valve (14), and at the moment, part of water at the outlet of the high-pressure water pump (5) flows back to the inlet of the high-pressure water pump (5) through the water pump bypass (13), so that the pressure in the brewing kettle (8) is reduced.
Step four: when the absolute pressure sensor (11) measures that the absolute pressure in the brewing kettle (8) is lower than a setting value, the pressure sensor data acquisition and processing unit (12) sends a trigger signal to close the water pump bypass electromagnetic valve (14), and the pressure in the brewing kettle (8) rises.
CN202010358739.5A 2020-04-26 2020-04-26 Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method Pending CN111557596A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010358739.5A CN111557596A (en) 2020-04-26 2020-04-26 Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010358739.5A CN111557596A (en) 2020-04-26 2020-04-26 Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method

Publications (1)

Publication Number Publication Date
CN111557596A true CN111557596A (en) 2020-08-21

Family

ID=72073269

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010358739.5A Pending CN111557596A (en) 2020-04-26 2020-04-26 Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method

Country Status (1)

Country Link
CN (1) CN111557596A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203873570U (en) * 2014-05-16 2014-10-15 广州极诺电器有限公司 Closed-loop control system of coffee maker water circuit
CN204049309U (en) * 2014-08-08 2014-12-31 广东新宝电器股份有限公司 Water path system of coffee machine and there is the coffee machine of this water path system of coffee machine
CN106030227A (en) * 2014-02-28 2016-10-12 Bsh家用电器有限公司 Household appliance comprising door opening aid
CN106308502A (en) * 2015-06-24 2017-01-11 广东美的生活电器制造有限公司 Coffee machine and control method thereof
CN206479274U (en) * 2017-02-23 2017-09-08 上海东软医疗科技有限公司 Pressure monitor system
CN208692995U (en) * 2017-11-13 2019-04-05 芜湖美的厨卫电器制造有限公司 Water dispenser and its control device
US20200054164A1 (en) * 2017-01-10 2020-02-20 Nuwave, Llc Automatic Beverage Maker Reservoir Heating System

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106030227A (en) * 2014-02-28 2016-10-12 Bsh家用电器有限公司 Household appliance comprising door opening aid
CN203873570U (en) * 2014-05-16 2014-10-15 广州极诺电器有限公司 Closed-loop control system of coffee maker water circuit
CN204049309U (en) * 2014-08-08 2014-12-31 广东新宝电器股份有限公司 Water path system of coffee machine and there is the coffee machine of this water path system of coffee machine
CN106308502A (en) * 2015-06-24 2017-01-11 广东美的生活电器制造有限公司 Coffee machine and control method thereof
US20200054164A1 (en) * 2017-01-10 2020-02-20 Nuwave, Llc Automatic Beverage Maker Reservoir Heating System
CN206479274U (en) * 2017-02-23 2017-09-08 上海东软医疗科技有限公司 Pressure monitor system
CN208692995U (en) * 2017-11-13 2019-04-05 芜湖美的厨卫电器制造有限公司 Water dispenser and its control device

Similar Documents

Publication Publication Date Title
CN105909536B (en) A kind of centrifugal pump biphase gas and liquid flow Performance Test System and its method of testing
CN103308293B (en) A kind of high temperature valve detection experiment system
EP1867262A1 (en) Machine for the production of water-based drinks and relative method
US20060174773A1 (en) Dispensing system with vacuum-filled metering chamber
CN103821710B (en) Submersible pump net positive suction head closed test stand
US20090031901A1 (en) Method and device for delivering foodstuff
US11986122B2 (en) Process for improving the uniformity of concentration of espresso coffee in an espresso coffee machine and associated espresso coffee machine
CN111557596A (en) Pump pressure type coffee machine brewing kettle with pressure control function and pressure control method
EP1742026A1 (en) Gas meter
EP3945962A1 (en) Machine and method to prepare beverages
US3863806A (en) Turbine meter
CN103850850A (en) Flow gauge for detecting circular fuel-injection quantity of oil injector of high-pressure common rail system of diesel engine
CN206648699U (en) A kind of underground drip irrigation system supplies water and the easy device of flow rate test
EP3854275A1 (en) Method of controlling the outflow of the amount of water required to form a given dose of a beverage obtained from ground coffee as it is being dispensed into a cup and apparatus for carrying out such method
JPH06221891A (en) Weighing device
CN212296825U (en) Water pump test bed capable of testing pressure value adjustment
CN210289739U (en) Oil field oil recovery well head liquid production volume metering device
CN203742973U (en) Closed testing device for net positive suction head of submerged pumps
CN212429168U (en) Water pump lift flow testing device
CN212296310U (en) Medicine feeding system for on-site calibration and adjustment of medicine feeding amount
KR100466317B1 (en) Liquid measuring equipment
CN106939896B (en) High-tightness digital metering non-return centrifugal pump
CN202735020U (en) Pressure measuring device
CN102483338B (en) Single jet flowmeter with improved driving torque and sensitivity
US20240115068A1 (en) Machine and method for producing and delivering coffee-based beverages

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200821

RJ01 Rejection of invention patent application after publication