Small volume high precision automatic variable pressure water pump control device

Abstract

This invention relates to the field of fluid pressure control devices, specifically to a small-volume, high-precision automatic variable pressure water pump control device. The device includes a water pump, a valve body, a motor, a feed slider, an elastic element, a sealing rod, a sealing gasket, a pressure sensor, and a control system. The water pump draws water into the valve body, which has an outlet channel and a pressure relief channel. The pressure relief channel is sealed by the sealing gasket and sealing rod in close contact. The motor drives the feed slider to displace, compressing the elastic element, and the pressure of the elastic element controls the sealing force of the sealing rod. When the pressure generated by the water pump exceeds the pressure set by the elastic element, the pressure relief port opens, achieving automatic pressure stabilization. The pressure sensor at the outlet monitors the pressure in real time and feeds back to the motor control system for closed-loop adjustment. This invention utilizes the linear correlation between the motor feed distance and the pressure to achieve precise automatic adjustment of the output pressure. It also features a simple structure, small size, and flexible application in various fields.

Description

Technical Field

[0001] This invention relates to the field of fluid pressure control device technology, specifically to a small-volume, high-precision automatic variable pressure water pump control device. Background Technology

[0002] In fields requiring precise control of water pressure, such as coffee making and precision fluid transport, water pump pressure control devices are widely used as core components. Their operating status directly determines the stability of water pressure and the quality of final products, such as extracted coffee. To meet the specific pressure requirements of different process stages, water pump systems often need to possess variable pressure control capabilities. However, traditional pressure regulation methods have many limitations: Currently, most small-volume water pumps on the market have non-adjustable pressure; some have pressure adjustment functions, but they rely entirely on manual adjustment of mechanical valves, which is not only cumbersome to operate, but also results in large pressure fluctuations and makes it difficult to maintain a stable pressure output.

[0003] In addition, in order to achieve automatic variable pressure control, existing water pumps and valve body components often require complex external piping and large electronic valves, resulting in an excessively large volume of the entire water pump control component, which is difficult to meet the requirements of modern portable or compact equipment for extremely small size.

[0004] Relevant patent documents retrieved: This document, published in China (CN109700320A) on May 3, 2019, discloses a pressure-adjustable coffee brewing system. The system controls a water pump to supply water to the brewing circuit via a one-way valve, controls the opening of an electromagnetic proportional valve, and uses a pressure detection device to monitor the water pressure in the brewing circuit in real time and feed it back to the control device. The control device compares the real-time pressure feedback with the pressure setpoint and calculates the control parameters for the water pump speed and the opening of the electromagnetic proportional valve, thereby regulating the water pressure.

[0005] The prior art represented by the aforementioned documents has at least the following unresolved technical problems or defects: While the aforementioned patent document CN109700320A includes feedback logic for automatic pressure regulation, it primarily targets systems with large volumes, controlling pressure through the combined action of a water pump speed and an electromagnetic proportional valve. Electromagnetic proportional valves are inherently complex and costly, and the entire system involves multiple stages of piping, including check valves and three-way solenoid valves, resulting in intricate connections and a bulky size that cannot be integrated into compact devices with limited internal space. Furthermore, due to the inertial hysteresis of water flow caused by directly adjusting the water pump speed, achieving high-precision instantaneous pressure control is difficult.

[0006] Additionally, a patent document published in China, publication number CN203122128U, dated August 14, 2013, discloses a portable espresso machine with adjustable pressure. While this design is small in size, its pressure regulating device at the dispensing port relies entirely on the operator manually rotating an external adjusting ring to change the compression of an internal spring. This purely mechanical manual pressure regulation method is inefficient, unable to achieve high-precision dynamic automatic adjustment during machine operation, and also unable to generate preset multi-segment pressure curves.

[0007] Therefore, there is still an urgent need in the field for a new type of water pump control device that can sense the water pressure status in real time and automatically adjust the pressure, thereby achieving high-precision, automatic fluid pressure control within a minimal pipeline structure and a very small volume, thus overcoming the problems of low control accuracy and poor user experience caused by complex pipelines, large volume, or purely manual operation in the prior art. Summary of the Invention

[0008] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a small-volume, high-precision automatic variable pressure water pump control device.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows: This invention provides a small-volume, high-precision automatic variable pressure water pump control device, comprising: a water pump for providing a pressurized water source; The valve body is connected to the outlet of the water pump. The valve body is provided with an outlet channel and a pressure relief channel. The end face of the pressure relief channel is provided with a pressure relief port. The motor is mounted on the valve body; The feed slider is connected to the output end of the motor for transmission. A sealing rod is disposed in the valve body, and a sealing gasket for sealing the pressure relief port is provided at the front end of the sealing rod; An elastic element is disposed between the feed slider and the sealing rod; A pressure sensor, installed on the water outlet channel, is used to monitor the output pressure in real time; The system is electrically connected to the pressure sensor and the motor respectively, and is used to adjust the movement of the motor according to the pressure signal fed back by the pressure sensor.

[0010] Furthermore, the motor is preferably a stepper motor, which adjusts the compression of the elastic element by controlling the feed distance.

[0011] Furthermore, the elastic element is preferably a spring.

[0012] Furthermore, the feed slider moves axially under the drive of the motor to squeeze the elastic element, thereby providing adjustable pressure to the sealing rod through the elastic element, so that the sealing gasket seals the pressure relief port.

[0013] Furthermore, when the water pump is working, if the pumping pressure P1 in the valve body is greater than the pressure P2 provided by the elastic element to the sealing rod, the pressure relief port is squeezed open, and excess water is discharged from the pressure relief port.

[0014] Furthermore, the pressure relief port is connected to the inlet of the water pump via a pipeline, allowing the excess water discharged to flow back to the water source for circulation.

[0015] Furthermore, the output pressure at the outlet of the water outlet channel is controlled by the difference between the pumping pressure of the water pump and the pressure provided by the elastic element. The control system receives the pressure signal monitored by the pressure sensor and controls the motor to form a closed-loop control.

[0016] Furthermore, the pressure provided by the elastic element to the sealing rod varies linearly with the feed distance controlled by the motor.

[0017] Furthermore, the valve body, motor, and water pump are integrated and installed using a fixed bracket.

[0018] Furthermore, the water outlet channel is connected to an external extraction device, and the control system drives the motor to move in real time, thereby achieving automatic adjustment of the output pressure curve.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention incorporates a pressure sensor at the water outlet channel to measure the fluid pressure at the output end in real time. By combining pressure detection with motor displacement control through a control system, a closed-loop control mechanism of "detection-judgment-motor feed-pressure correction" is formed. This ensures that the output pressure quickly stabilizes at the target level after each pressure adjustment, improving the reliability of fluid pressure control.

[0020] This invention integrates the pressure relief channel, pressure stabilizing mechanism, and mechanical pressure regulating components into a single valve body, ensuring that the pressure regulating mechanism can directly act on the entire internal flow path. This design not only completely eliminates the need for complex external bypass pipelines, but also makes the overall structure extremely compact, making it easy to integrate into handheld or space-constrained miniaturized devices. Attached Figure Description

[0021] Figure 1 This invention provides a schematic diagram of the overall structure of a small-volume, high-precision automatic variable pressure water pump control device.

[0022] Figure 2This invention provides another overall structural schematic diagram of a small-volume, high-precision automatic variable pressure water pump control device.

[0023] Figure 3 This invention provides a cross-sectional view of the internal structure of a small-volume, high-precision automatic variable pressure water pump control device.

[0024] Explanation of reference numerals in the attached figures: 25. Pressure sensor; 26. Water pump; 27. Valve body; 28. Motor; 29. ​​Water pump inlet; 30. Water pump outlet; 31. Pressure relief port; 32. Fixed bracket; 33. Sealing ring; 34. Feed slider; 35. Elastic element; 36. Sealing rod; 37. Sealing gasket. Detailed Implementation

[0025] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0026] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of the invention.

[0027] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0028] Example 1 like Figure 1 and Figure 2 As shown, this invention provides a small-volume, high-precision automatic variable pressure water pump control device. Its core design lies in achieving precise control of fluid pressure through the displacement of the motor 28 and the pressure feedback of the elastic element 35. For example... Figure 1 As shown, the entire device is modularly integrated using a fixed bracket 32.

[0029] The power source of the device consists of a water pump 26 and a motor 28. The water pump 26 can be of various forms such as a gear pump or an electromagnetic pump. Its water inlet 29 is connected to the water source, and its water outlet 30 is connected to the valve body 27 through a high-pressure pipeline. The water source enters from the water pump inlet 29, is pressurized by the water pump 26, and is discharged from the water pump outlet 30 to enter the subsequent regulation stage.

[0030] A motor 28 is mounted on one end of the valve body 27, while the other end serves as the fluid output. In this embodiment, the motor 28 is preferably a stepper motor to facilitate precise angular or linear displacement control via pulse signals. The device also includes a control system, which is preferably an electrical component containing a microprocessor, electrically connected to the pressure sensor 25 and the motor 28. A pressure sensor 25 is installed at the outlet of the valve body 27. This pressure sensor 25 senses the pressure state within the outlet channel and converts the pressure signal into an electrical signal, feeding it back to the control system to provide a basis for automatic system adjustment.

[0031] like Figure 3 As shown, the valve body 27 has independent but functionally related water outlet channels and pressure relief channels inside. The power output end of the motor 28 is connected to the feed slider 34. When the motor 28 rotates, it drives the feed slider 34 to move axially linearly back and forth within the cavity of the valve body 27. An elastic element 35 is connected to the front end of the feed slider 34, which in this embodiment is preferably a high-precision compression spring.

[0032] The other end of the elastic element 35 abuts against the sealing rod 36. A sealing gasket 37 is embedded at the front end of the sealing rod 36, directly facing the pressure relief port 31 on the end face of the pressure relief channel. Furthermore, to ensure reliable operation of the moving parts within the valve cavity, a sealing ring 33 is provided on the sealing rod 36. This design prevents fluid leakage to the motor 28 end under high pressure and ensures constant resistance of the sealing rod 36 during movement, thereby reducing the impact of friction on pressure control accuracy.

[0033] This device uses a control system to precisely convert the displacement of the motor 28 into the pressure of the elastic element 35, thereby dynamically changing the opening threshold of the pressure relief port 31. The specific operating logic is as follows: When the control system receives a pressure adjustment command, the drive motor 28 starts to operate, causing the feed slider 34 to move. As the feed slider 34 moves forward, the elastic element 35 is compressed, and the resulting elastic force is transmitted to the sealing gasket 37 through the sealing rod 36, causing the sealing gasket 37 to press tightly against the pressure relief port 31 at a set pressure. The critical pressure required for the pressure relief port 31 to open is set to P2. At this time, the sealing force of the pressure relief port 31 corresponds to the system's preset pressure relief pressure P2.

[0034] Subsequently, pump 26 starts, injecting fluid with a certain initial pressure P1 into valve body 27. The fluid within valve body 27 generates a counterforce attempting to push open sealing gasket 37. Pressurization phase: When the water pump 26 is just started or the load pressure demand is high, if P1 fails to overcome P2 set by the elastic element 35, the pressure relief port 31 remains tightly sealed. At this time, all water flows to the load end through the outlet channel.

[0035] Pressure relief and balancing stage: When the pressure P1 generated by the water pump 26 is greater than the set pressure P2, the thrust generated by the water flow will overcome the pressure of the elastic element 35, pushing the sealing rod 36 back slightly. At this time, the pressure relief port 31 opens, and the excess water flows out from the pressure relief port 31 and back to the water pump inlet 29 through the pipeline. At this time, under the ideal condition of ignoring the small flow resistance loss of the pipeline, the output pressure P at the outlet actually depends on the difference between the two, that is, it follows the formula P≈P1-P2.

[0036] Dynamic adjustment phase: The pressure sensor 25 installed at the outlet captures the current actual pressure in real time and feeds it back to the control system. Since the elastic force generated by the elastic element 35 is linearly positively correlated with its compression displacement within the elastic limit (i.e., Hooke's Law), if the pressure deviates from the preset value, the control system automatically drives the motor 28 to adjust the position of the feed slider 34, changing the compression of the elastic element 35, thereby achieving dynamic correction of the output pressure. Because the motor 28 preferably uses a high-precision stepper motor, it can perform precise distance control, thus enabling the control system to sensitively fine-tune the value of P2, thereby achieving constant output pressure.

[0037] Based on this mechanism, this device can achieve complex pressure control.

[0038] For example, in the coffee extraction scenario, during the pre-soaking stage, the control system drives the motor 28 to move the feed slider 34 backward, reducing the pressure of the elastic element 35 and allowing the material to be soaked for several seconds.

[0039] When constant pressure extraction is required, the control system instructs motor 28 to drive the feed slider 34 forward, increasing the pressure on the elastic element 35, and the output pressure rises to the preset target value. Subsequently, motor 28 locks in position, and the pressure relief mechanism fluctuates in real time according to the operating conditions of water pump 26 to achieve constant pressure output.

[0040] During the final stage of extraction, the control system drives the motor 28 to retract moderately, gradually releasing the pressure of the elastic element 35 to achieve a gentle pressure reduction at the end, avoiding over-extraction.

[0041] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A small-volume, high-precision automatic variable pressure water pump control device, characterized in that, Includes: a water pump, used to provide a pressurized water source; The valve body is connected to the outlet of the water pump. The valve body is provided with an outlet channel and a pressure relief channel. The end face of the pressure relief channel is provided with a pressure relief port. The motor is mounted on the valve body; The feed slider is connected to the output end of the motor for transmission. A sealing rod is disposed in the valve body, and a sealing gasket for sealing the pressure relief port is provided at the front end of the sealing rod; An elastic element is disposed between the feed slider and the sealing rod; A pressure sensor, installed on the water outlet channel, is used to monitor the output pressure in real time; The system is electrically connected to the pressure sensor and the motor respectively, and is used to adjust the movement of the motor according to the pressure signal fed back by the pressure sensor.

2. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The motor is a stepper motor, which adjusts the compression of the elastic element by controlling the feed distance.

3. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The elastic element is a spring.

4. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The feed slider moves axially under the drive of the motor to squeeze the elastic element, thereby providing adjustable pressure to the sealing rod through the elastic element, so that the sealing gasket seals the pressure relief port.

5. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: When the water pump is working, if the pumping pressure P1 in the valve body is greater than the pressure P2 provided by the elastic element to the sealing rod, the pressure relief port is squeezed open and the excess water is discharged from the pressure relief port.

6. The small-volume, high-precision automatic variable pressure water pump control device according to claim 5, characterized in that: The pressure relief port is connected to the inlet of the water pump via a pipeline, so that the excess water discharged flows back to the water source for circulation.

7. The small-volume, high-precision automatic variable pressure water pump control device according to claim 5, characterized in that: The output pressure at the outlet of the water outlet channel is controlled by the difference between the pumping pressure of the water pump and the pressure provided by the elastic element. The control system receives the pressure signal monitored by the pressure sensor and controls the motor to form a closed-loop control.

8. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The pressure provided by the elastic element to the sealing rod varies linearly with the feed distance controlled by the motor.

9. The small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The valve body, motor, and water pump are integrated and installed using a fixed bracket.

10. A small-volume, high-precision automatic variable pressure water pump control device according to claim 1, characterized in that: The water outlet channel is connected to an external extraction device, and the control system drives the motor to move in real time to achieve automatic adjustment of the output pressure curve.

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