A coffee maker

Abstract

This utility model discloses a coffee machine, comprising: a pressure regulating mechanism including a housing and a pressure regulating component; a first receiving cavity formed within the housing; the pressure regulating component disposed within the first receiving cavity; the pressure regulating component including a valve body and an adjusting rod; an air guiding cavity formed inside the valve body; the air guiding cavity having an inlet end and an outlet end communicating with an external air source; and an outlet end forming a throttling orifice; the working end of the adjusting rod corresponding to the throttling orifice; and a brewing mechanism including a second receiving cavity for holding a coffee powder container and a water storage container; the second receiving cavity being connected to the throttling orifice; and the axial displacement of the adjusting rod changing the flow cross-sectional area between the adjusting rod and the throttling orifice. This allows for staged pressure control, improving the coffee extraction effect.

Description

Technical Field

[0001] This utility model relates to the field of coffee equipment technology, and in particular to a coffee machine. Background Technology

[0002] When brewing espresso, ensuring the appropriate pressure is crucial, as this helps to more effectively extract the oils from the coffee grounds, thus enhancing the flavor of the beverage. An ideal extraction process typically includes a preliminary stage where the coffee grounds are pre-infused at a low pressure of 1-3 bar for a few seconds, followed by increasing the pressure to a high of 9 bar for the main extraction. However, some espresso makers on the market today, which rely on gas cylinders for air supply, struggle to achieve precise pressure control within the water tank. This means they can only release pressure up to 9 bar at a time, unable to perform the segmented pressure adjustments described above. Consequently, coffee brewed with these devices often lacks in texture and flavor. To achieve optimal extraction, devices with more precise pressure control are necessary. Current technology urgently needs improvement to address these issues. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a coffee machine capable of staged pressure control, thereby improving the coffee extraction effect.

[0004] A coffee machine according to a first aspect of the present invention includes:

[0005] A pressure regulating mechanism includes a housing and a pressure regulating component. A first receiving cavity is formed inside the housing. The pressure regulating component is disposed inside the first receiving cavity. The pressure regulating component includes a valve body and an adjusting rod. An air guiding cavity is formed inside the valve body. The air guiding cavity is provided with an inlet end and an outlet end that communicate with an external air source. A throttling orifice is formed at the outlet end of the air guiding cavity. The working end of the adjusting rod is provided corresponding to the throttling orifice.

[0006] The brewing mechanism includes a second receiving cavity for holding a coffee powder container and a water storage container. The second receiving cavity is connected to the throttling orifice. The axial displacement of the adjusting rod can change the flow cross-sectional area between the adjusting rod and the throttling orifice.

[0007] A coffee machine according to an embodiment of the present invention has at least the following beneficial effects: Through a unique pressure regulating mechanism, the user can precisely control the pressure at different stages of the brewing process. This design allows for the application of pressure as low as 1-3 bar during the pre-infusion stage and increases to 9 bar during the main extraction stage, thereby achieving more delicate and segmented pressure adjustments to achieve the ideal extraction effect. Because it can more accurately simulate the pressure changes during the ideal extraction process, this coffee machine helps to more effectively extract the oil components from the coffee powder, thus significantly improving the texture and flavor of the beverage. Compared to devices that rely on a single release of up to 9 bar pressure, this device can produce espresso with a richer flavor and more distinct layers. The design of the adjusting lever and throttle orifice not only improves the ease of operation of the device but also increases its flexibility, allowing users to fine-tune it according to personal taste preferences or the characteristics of specific coffee beans. The coffee machine is designed with the user's mobility needs in mind, employing a compact and lightweight structural design for easy portability.

[0008] According to some embodiments of this utility model, the pressure regulating assembly further includes an adjusting seat, which is installed on the valve body. The adjusting seat has a first threaded portion inside, and the adjusting rod has a second threaded portion on its outer wall. The first threaded portion and the second threaded portion form a helical transmission pair. The user can precisely adjust the axial displacement of the adjusting rod to ensure the required pressure value is achieved at different brewing stages, thereby improving the quality of coffee extraction.

[0009] According to some embodiments of this utility model, the pitch of the helical drive pair is 0.7mm to 0.8mm, and the thread profile is a trapezoidal thread with self-locking characteristics. This allows for very precise control of the axial displacement of the adjusting rod. This finer pitch allows users to make extremely accurate pressure adjustments, helping to achieve ideal coffee extraction conditions, thereby enhancing the flavor and texture of the coffee.

[0010] According to some embodiments of this utility model, the end of the adjusting rod is provided with a tapered adjusting head, and the tapered surface of the tapered adjusting head forms a gradually narrowing throttling channel with the inlet of the throttling orifice. The gradually narrowing throttling channel helps to achieve a smoother transition between different pressure stages, thus making the pressure change between the pre-infusion and main extraction stages more gentle. This avoids problems such as uneven distribution or splashing of coffee powder in the coffee powder hopper caused by sudden pressure changes, and helps to improve the taste of the final coffee beverage.

[0011] According to some embodiments of this utility model, the pressure regulating assembly further includes a gas cylinder mounting base and an air pump mounting base, which are embedded in the first receiving cavity. The gas cylinder mounting base is electrically connected to the air inlet. Installing the pressure regulating assembly into the first receiving cavity effectively reduces externally visible accessories, making the entire coffee machine more concise. Users can adjust the most suitable gas supply method according to their personal needs.

[0012] According to some embodiments of this utility model, the valve body further includes an air inlet sealing seat, which is disposed at the air inlet end. One end of the air inlet sealing seat abuts against the valve body, and the other end abuts against the gas cylinder mounting base. A first annular groove and a second annular groove are respectively formed at both ends of the air inlet sealing seat. A first sealing ring is disposed in the first annular groove, and a second sealing ring is disposed in the second annular groove. This provides dual protection; even if one sealing ring wears out, the other can maintain basic sealing function. The air inlet sealing seat can also support the first and second sealing rings, further improving the service life of the sealing rings.

[0013] According to some embodiments of this utility model, the air pump mounting base is provided with an independent air pump supply channel, which is electrically connected to the second receiving cavity. The air pump supply channel is also equipped with a pressure gauge, which is used to obtain the pressure within the second receiving cavity. The pressure gauge allows users to conveniently monitor the air pressure within the second receiving cavity in real time, facilitating precise control of pressure changes during the coffee extraction process. The pressure gauge shares the air pump supply channel for pressure monitoring, simplifying the system's structural layout, reducing the production cost of the coffee machine, and fully utilizing the space within the first receiving cavity.

[0014] According to some embodiments of this utility model, the pneumatic pressure regulating assembly further includes a safety relief valve. The safety relief valve is disposed in the first receiving cavity and is electrically connected to the second receiving cavity. A third sealing ring is provided between the safety relief valve and the second receiving cavity. As a key safety feature, the safety relief valve can automatically open when the internal pressure of the system exceeds a preset safety threshold, releasing excessive pressure, thereby protecting the equipment from damage and ensuring user safety.

[0015] According to some embodiments of this utility model, the pressure regulating assembly further includes a rapid exhaust valve, which is disposed in the first receiving cavity and is connected to the second receiving cavity. A fourth sealing ring is provided between the rapid exhaust valve and the second receiving cavity. When it is necessary to replace the coffee powder compartment and the water storage compartment, the high pressure in the second receiving cavity can be released through the rapid exhaust valve, thereby making it easier and safer for the user to open the second receiving cavity and avoiding damage to the coffee machine under high pressure.

[0016] According to some embodiments of this utility model, the quick-release valve includes a pipe body and a locking block. The pipe body is provided with a radial vent hole. The locking block is threaded into the valve body. When the locking block is screwed into the pipe body, it closes the vent hole. When the locking block is screwed out of the pipe body, the vent hole communicates with the outside atmosphere, forming a pressure relief channel. By using a threaded connection, the locking block can more tightly seal the vent hole, providing a higher sealing performance than traditional pull-out and spring-loaded types, effectively preventing gas leakage and ensuring the stability and reliability of the system's internal pressure.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is one of the schematic diagrams of a coffee machine according to an embodiment of the present utility model;

[0020] Figure 2 This is a second schematic diagram of a coffee machine according to an embodiment of the present utility model;

[0021] Figure 3 This is one of the schematic diagrams of the pressure regulating mechanism according to an embodiment of the present utility model;

[0022] Figure 4 This is a second schematic diagram of the pressure regulating mechanism according to an embodiment of the present utility model;

[0023] Figure 5 This is one of the schematic diagrams of a pneumatic pressure regulating component according to an embodiment of the present utility model;

[0024] Figure 6 This is a second schematic diagram of the pneumatic pressure regulating component according to an embodiment of the present utility model;

[0025] Figure 7 This is a cross-sectional view of the pneumatic pressure regulating component according to an embodiment of the present utility model;

[0026] Figure 8 This is a schematic diagram of the adjusting rod according to an embodiment of the present invention.

[0027] Reference numerals: Pressure regulating mechanism 100; Brewing mechanism 110; Housing 120; Pressure gauge 130; Pressure regulating component 140; Gas cylinder mounting base 150; Air pump mounting base 160; Safety pressure relief valve 170; Quick exhaust valve 180; Valve body 190; Adjusting seat 200; Adjusting rod 210; Inlet end 220; Outlet end 230; First sealing ring 240; Second sealing ring 250; Inlet sealing seat 260; Throttling orifice 270; Conical adjusting head 280. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] Reference Figures 1 to 8 In existing technologies, precise pressure control during coffee extraction is crucial for enhancing flavor. Ideal extraction requires segmented pressure adjustments, such as pre-infusing coffee grounds at low pressure (2-3 bar) before switching to high pressure (around 9 bar) extraction. Traditional coffee machines rely on gas cylinders for supply, and their pressure regulation method is singular, unable to achieve dynamic adjustment. This limits extraction results, and the lack of an effective control device between the brewing mechanism 110 and the pressure source leads to insufficient pressure output stability, affecting the extraction efficiency of coffee oils.

[0033] To address the aforementioned issues, constructing a linearly adjustable pressure output system is crucial. Traditional gas cylinder pressure supply devices can only release a fixed pressure, failing to meet the needs of segmented extraction. Analysis of the pressure transmission path revealed that changes in the cross-sectional area of ​​the throttling orifice 270 directly affect the output pressure value. Therefore, a mechanical adjustment component was considered to be installed between the gas source and the brewing mechanism 110, utilizing axial displacement to change the flow cross-sectional area and achieve continuous pressure control.

[0034] Therefore, this application proposes a coffee machine solution in which the pressure regulating mechanism 100 and the brewing mechanism 110 work together. The pressure regulating mechanism 100 includes a housing 120 and a pressure regulating assembly 140. A first receiving cavity is formed within the housing 120 for mounting the pressure regulating assembly 140. The pressure regulating assembly 140 includes a valve body 190 and an adjusting rod 210. The air guide cavity inside the valve body 190 is connected to an external air source and the brewing mechanism 110. The air outlet end 230 of the air guide cavity forms a throttling orifice 270, and the working end of the adjusting rod 210 is positioned corresponding to the throttling orifice 270. The brewing mechanism 110 includes a second receiving cavity for holding the coffee powder container and the water storage container, which is electrically connected to the throttling orifice 270. The axial displacement of the adjusting rod 210 changes the flow cross-sectional area between it and the throttling orifice 270, thereby regulating the pressure value transmitted to the second receiving cavity.

[0035] The pressure regulating mechanism 100 is a mechanical component used to control the gas pressure transmission path, which can be implemented by combining a cast metal housing 120 with a precision-machined valve body 190. The gas guide chamber is a gas passage connecting the inside and outside of the valve body 190, specifically employing a stepped through-hole structure, with the inlet end 220 connecting to the gas source interface and the outlet end 230 forming a constriction. The throttling orifice 270 is a channel structure that restricts gas flow. The axial displacement of the adjusting rod 210 refers to the linear movement along the axis of the gas guide chamber, which can be achieved with high precision through a threaded transmission mechanism. The flow cross-sectional area refers to the area of ​​the annular gap formed between the end of the adjusting rod 210 and the edge of the throttling orifice 270; changes in this area directly affect the gas flow rate and pressure value.

[0036] Specifically, the depth to which the end of the adjusting rod 210 extends into the region of the throttling orifice 270 changes the clearance between it and the orifice wall through axial displacement. When the adjusting rod 210 is pushed towards the throttling orifice 270, the flow cross-sectional area decreases; when the adjusting rod 210 is retracted, the flow cross-sectional area increases. This mechanical adjustment method allows the operator to precisely control the pressure parameters in real time according to the needs of the extraction stage.

[0037] Compared to existing technologies, traditional gas cylinder pressurization devices release constant pressure through a fixed orifice diameter, while this solution achieves linear pressure control by dynamically adjusting the cross-sectional area of ​​the throttling orifice 270. In existing technologies, the pressure in the brewing chamber cannot be adjusted in stages; in this solution, the axial displacement of the adjusting rod 210 can be correlated with the pressure value, allowing for the setting of multiple pressure stages.

[0038] Through the above technical solution, this application achieves segmented and precise control of brewing pressure, maintaining a low-pressure state during the pre-infusion stage and rapidly increasing to a high-pressure value during the main extraction stage. The pressure adjustment process is steplessly and continuously adjustable, avoiding the defects of sudden pressure changes in traditional devices and effectively improving the extraction efficiency of coffee oils. The mechanical adjustment mechanism has high reliability, solving the problem of unstable extraction caused by pressure fluctuations in the pneumatic system.

[0039] This application further proposes a pneumatic pressure regulating assembly 140 including an adjusting seat 200, the adjusting seat 200 being mounted on a valve body 190, the interior of the adjusting seat 200 forming a first threaded portion, the outer wall of the adjusting rod 210 forming a second threaded portion, and the first threaded portion and the second threaded portion forming a helical transmission pair.

[0040] The adjusting seat 200 refers to the fixed support structure installed on the valve body 190. Specifically, it can be made of metal or high-strength plastic and machined into a sleeve structure with internal threads. This provides a rigid mounting base for the helical drive pair, preventing transmission errors caused by component deformation. The first threaded portion refers to the continuous threaded structure on the inner wall of the adjusting seat 200, which can be formed by turning or injection molding. It mates with the second threaded portion on the outer wall of the adjusting rod 210 to convert rotary motion into linear motion. The second threaded portion refers to the continuous threaded structure on the outer wall of the adjusting rod 210. Specifically, it can be a trapezoidal or triangular thread, which meshes with the first threaded portion to form a helical drive pair. The axial displacement accuracy is controlled by the thread lead. The helical drive pair is a mechanical transmission mechanism composed of the first and second threaded portions. Specifically, it can be designed with a self-locking thread profile, such as a trapezoidal thread, so that the adjusting rod 210 remains stable in position without external force, preventing displacement due to pressure fluctuations or vibration.

[0041] Specifically, during rotation, the second threaded portion of the adjusting rod 210 engages with the first threaded portion of the adjusting seat 200, generating a helical motion that converts rotational torque into axial displacement. The lead of the thread engagement determines the axial movement of the adjusting rod 210 per revolution. For example, when the thread lead is 0.7 mm, the rotation angle and displacement are linearly related, thus achieving precise displacement control. Through the axial displacement of the adjusting rod 210, the flow cross-sectional area between its working end and the throttling orifice 270 is changed, thereby regulating the gas flow rate. The self-locking characteristic of the threaded pair prevents the adjusting rod 210 from experiencing reverse displacement due to gas pressure or vibration after rotation stops, ensuring a constant flow cross-sectional area. The rigid connection between the adjusting seat 200 and the valve body 190 prevents relative displacement of the threaded pair under stress, further ensuring the stability of the adjustment accuracy.

[0042] Compared to existing technologies, the pressure adjustment mechanism 100 of traditional coffee machines typically uses a manual knob to directly push the adjustment lever 210, lacking a mechanical transmission structure, resulting in low displacement control accuracy and difficulty in locking the position. This solution, however, converts rotational motion into precise axial displacement through a helical transmission pair, and combined with the self-locking thread characteristics, solves the problem of easy displacement during pressure adjustment. In existing technologies, the adjustment lever 210 and valve body 190 often use a sliding fit, requiring an additional locking device to prevent displacement. This solution achieves self-locking through the thread engagement itself, simplifying the structure and improving reliability.

[0043] Through the above technical solution, this application achieves precise fine-tuning of the flow cross-sectional area of ​​the throttling orifice 270, ensuring that the gas pressure can be stably maintained within the target range. The mechanical constraint characteristics of the screw drive pair eliminate parameter drift caused by vibration or pressure fluctuations in traditional adjustment mechanisms, enabling the coffee machine to reliably perform segmented pressure control during the extraction process. The axial displacement accuracy of the adjusting rod 210 is effectively controlled by the thread lead, solving the technical defect of traditional pneumatic coffee machines that are difficult to achieve fine pressure adjustment.

[0044] This application further proposes that the pitch of the helical drive pair be 0.7 mm to 0.8 mm, and the thread profile be a trapezoidal thread with self-locking characteristics. In some preferred embodiments, the pitch is selected as 0.75 mm, which can balance adjustment accuracy and convenience.

[0045] The pitch of the helical drive pair refers to the axial distance between the crests of two adjacent threads. Specifically, a standard pitch of 0.75mm can be achieved by machining the adjusting rod 210 and adjusting seat 200 with precision equipment. This size range allows the axial displacement generated by a single rotation to be controlled at the millimeter level. The trapezoidal thread profile refers to a thread cross-section with an isosceles trapezoidal structure. Specifically, it can be achieved by cutting a symmetrical thread profile with an inclination angle of 15 degrees on both sides using a CNC machine tool. Its wide contact surface can form effective frictional resistance.

[0046] Specifically, when the adjusting rod 210 adjusts the pressure through rotation, the 0.7mm to 0.8mm pitch results in an axial displacement of only about 0.002mm for every degree of rotation. This micron-level displacement resolution allows for gradual adjustment of the throttling channel cross-sectional area, meeting the control requirements for 2-bar pressure changes during the pre-soaking stage. The inclined surfaces on both sides of the trapezoidal thread generate a radial force during engagement. This force acts on the thread contact surface, creating a static friction torque. When external vibrations are transmitted to the adjusting mechanism, this friction torque counteracts the tendency for rotational loosening, thereby maintaining the axial positioning accuracy of the adjusting rod 210.

[0047] Compared to existing technologies, conventional coffee machines typically use triangular threads with a pitch of 1.5mm or more in their threaded transmission mechanisms. This results in excessive displacement per turn, leading to insufficient pressure regulation precision. Furthermore, the sharp tooth profile of the triangular thread has a small contact area, making it prone to plastic deformation under high pressure conditions, potentially causing self-locking failure. This solution, however, achieves more precise pressure grading control while maintaining the same adjustment stroke by reducing the pitch and optimizing the tooth profile structure. Simultaneously, it utilizes the mechanical properties of trapezoidal threads to construct a reliable self-locking mechanism.

[0048] Through the above technical solution, this application achieves stable maintenance of the axial position of the adjusting rod 210 under a high pressure environment of 9 bar, eliminates the pressure drift phenomenon caused by vibration of traditional threaded pairs, and improves the pressure adjustment accuracy to within 0.2 bar, ensuring that the coffee powder can obtain a precisely matched pressure curve in both the pre-infusion stage and the high-pressure extraction stage.

[0049] This application further proposes that the end of the adjusting rod 210 is provided with a conical adjusting head 280, and the conical surface of the conical adjusting head 280 and the inlet of the throttling orifice 270 form a gradually narrowing throttling channel.

[0050] The conical adjusting head 280 refers to an adjusting component with a conical geometry at its end. This can be achieved using precision-machined metal or ceramic materials, with a conical angle ranging from 15° to 60°. The conical geometry allows for a linearly changing gap with the inlet of the throttling orifice 270 during axial displacement. The tapered throttling channel refers to a channel shape where the flow cross-section gradually decreases along the airflow direction. This is achieved by ensuring coaxiality between the conical surface and the inlet. The tapered structure allows for a gradient change in airflow velocity.

[0051] Specifically, a conical regulating head 280 is installed at the end of the regulating rod 210, and its conical surface forms an annular gap with the inlet of the throttling orifice 270. When the regulating rod 210 advances axially, the height of the gap between the conical surface and the inlet decreases, and the flow cross-sectional area decreases linearly; when the regulating rod 210 retracts axially, the gap height increases, and the flow cross-sectional area increases linearly. The length of the conical surface of the tapered channel can be 1.2 to 2 times the inlet diameter, allowing the airflow to undergo a transition from diffusion to convergence within the channel. This structure enables the airflow to form a laminar flow state in the throttling region, avoiding pressure abrupt changes caused by turbulence.

[0052] Compared to existing technologies, the traditional throttling orifice 270 uses a fixed orifice diameter and a plunger-type regulating structure, which is prone to vortex separation during regulation. This design, through the cooperation of the conical surface and the inlet, forms a gradually narrowing channel, achieving a smoother flow rate curve for the same displacement. In existing technologies, the end of the regulating rod 210 is mostly a planar structure, forming a right-angle interception with the edge of the throttling orifice 270. In contrast, the conical structure of this design creates an inclined transition shape at the throttling boundary, effectively reducing sudden changes in local velocity.

[0053] Through the above technical solution, this application achieves continuous linear adjustment of the pressure in the coffee machine's brewing chamber, ensuring that the low-pressure output during the pre-infusion stage is stably maintained within the target range, while simultaneously achieving rapid pressure ramp-up during the high-pressure stage. The tapered throttling channel structure reduces oscillations during pressure regulation, ensuring that the pressure curve during extraction meets the set parameter requirements. The engagement between the tapered adjusting head 280 and the throttling orifice 270 allows micron-level axial displacement to be converted into precise changes in the flow cross-sectional area, solving the problem of insufficient adjustment sensitivity in traditional structures.

[0054] This application further proposes that the pressure regulating assembly 140 also includes a gas cylinder mounting base 150 and a gas pump mounting base 160, which are embedded in the first receiving cavity, and the gas cylinder mounting base 150 is electrically connected to the air inlet end 220.

[0055] The gas cylinder mounting base 150 is a mounting structure used to fix an external gas cylinder and provide a gas source input interface. Specifically, it can be implemented using a metal base with a threaded interface, and its interior has a gas passage that matches the gas cylinder's output port. The air pump mounting base 160 is a mounting structure used to provide an electric air pump interface and an independent gas supply path. Specifically, it can be implemented using a base with a threaded locking groove, and its interior has an air pump interface that communicates with the air pump's output end. Embedded mounting refers to embedding the gas cylinder mounting base 150 and the air pump mounting base 160 into the first receiving cavity inside the housing 120.

[0056] Specifically, the gas cylinder mounting base 150 and the air inlet 220 of the air guide chamber are directly connected through an internal gas channel, allowing the gas released from the gas cylinder to enter the air guide chamber along this channel. The air pump mounting base 160 has an independent air pump supply channel, which is connected to the second receiving cavity of the brewing mechanism 110, allowing the gas output from the air pump to directly act on the water storage tank. The embedded installation restricts the installation position of the gas cylinder and air pump within the housing 120, preventing the connection from falling off due to external collisions or vibrations. The isolated layout of the gas cylinder mounting base 150 and the air pump mounting base 160 allows users to choose between a single gas source or dual gas sources for coordinated gas supply as needed. For example, in outdoor scenarios, gas cylinder supply can be prioritized, while in fixed locations, air pump supply can be switched, thereby reducing reliance on disposable gas cylinders.

[0057] Compared to existing technologies, traditional coffee machines only have a single gas cylinder interface, which is incompatible with electric air pump supply modes, resulting in high operating costs and limited gas source options. This solution, through an embedded dual gas source interface design, achieves flexible switching of gas supply while maintaining the device's miniaturization, thus solving the cost problem caused by the single gas source in existing devices.

[0058] Through the above technical solution, this application enables the coffee machine to freely switch between gas cylinder supply and air pump supply, reducing long-term operating costs for users. Simultaneously, the embedded installation improves the stability and sealing of the gas source connection, avoiding the risk of gas leakage. The independent gas supply channel design of the air pump mounting bracket 160 further ensures that the pressure of different gas sources does not interfere with each other, providing a foundation for precise control of brewing pressure.

[0059] This application further proposes that the valve body 190 also includes an air inlet sealing seat 260, which is disposed at the air inlet end 220. One end of the air inlet sealing seat 260 abuts against the valve body 190, and the other end abuts against the gas cylinder mounting seat 150. The two ends of the air inlet sealing seat 260 are respectively provided with a first annular groove and a second annular groove. A first sealing ring 240 is provided in the first annular groove, and a second sealing ring 250 is provided in the second annular groove.

[0060] The intake sealing seat 260 is a transition component located at the intake end 220, connecting the valve body 190 and the gas cylinder mounting seat 150. It forms mechanical contact with the valve body 190 and the gas cylinder mounting seat 150 through its two planar contact surfaces. The first and second annular grooves are groove structures distributed circumferentially along the axial end face of the intake sealing seat 260, used to fix the sealing ring and limit its radial displacement. The first sealing ring 240 and the second sealing ring 250 are elastic sealing elements embedded in the annular grooves, which can be made of fluororubber and form a contact seal with the mating surface through pre-compression deformation.

[0061] Specifically, when the gas cylinder mounting base 150 and the valve body 190 are connected via the inlet sealing seat 260, the flat surfaces at both ends of the inlet sealing seat 260 are respectively in close contact with the corresponding contact surfaces of the valve body 190 and the gas cylinder mounting base 150. The first sealing ring 240 is pressed into the first annular groove, and its outer diameter forms an interference fit with the contact surface of the valve body 190; the second sealing ring 250 is pressed into the second annular groove, and its outer diameter forms an interference fit with the contact surface of the gas cylinder mounting base 150. Under the action of air pressure load, the sealing rings are compressed and undergo radial expansion, filling any microscopic gaps that may exist between the contact surfaces. The double sealing structure forms a series sealing effect. When the first sealing ring 240 wears due to long-term use, the second sealing ring 250 can still maintain its sealing function, preventing gas from escaping along the axial leakage path.

[0062] Compared to existing technologies, traditional solutions use only a single sealing ring on a single contact surface. Under repeated high-pressure impacts, the sealing ring is prone to localized deformation or wear, leading to seal failure. This solution improves the single-point seal to a double-redundant seal by adding an inlet sealing seat 260 with a double-seal structure. This effectively reduces the load intensity of a single sealing ring under the same working pressure, extending the overall service life of the sealing assembly. Simultaneously, the annular grooved structure provides radial limiting support for the sealing ring, preventing direct impact from high-pressure gas from causing extrusion and damage.

[0063] Through the above technical solution, this application effectively solves the pressure leakage problem caused by insufficient sealing at the connection between the gas cylinder mounting base 150 and the valve body 190. The double sealing ring structure can maintain a stable sealing state even under dynamic pressure fluctuations, ensuring that the brewing mechanism 110 receives precise and controllable gas pressure input. The radial limiting design of the sealing ring avoids the risk of the sealing material being squeezed out and grooved under high pressure, significantly improving the durability and reliability of the sealing component and meeting the working conditions required for long-term high-pressure extraction of coffee machines.

[0064] This application further proposes that the air pump mounting base 160 is provided with an independent air pump supply channel, which is connected to the second receiving cavity. The air pump supply channel is also provided with a pressure gauge 130, which is used to obtain the pressure in the second receiving cavity.

[0065] The independent gas pump supply channel refers to a dedicated gas transmission structure that is physically isolated from the gas cylinder supply path. Specifically, it can be achieved by integrating a metal tube or a polymer material tube with the gas pump mounting base 160 to form a sealed flow channel, thereby avoiding gas supply interference by isolating different gas source paths.

[0066] Among them, the pressure gauge 130 refers to a measuring device that can detect gas pressure in real time. Specifically, it can be implemented by connecting a Bourdon tube or piezoelectric sensor to the side wall of the air pump supply channel, and provide a basis for adjustment operation by directly reading the pressure data inside the second receiving chamber.

[0067] Specifically, the compressed gas generated by the air pump is directly delivered to the second receiving chamber through an independent air pump supply channel, avoiding the cross-influence of pressure fluctuations in the gas cylinder supply path on the air pump supply. A pressure gauge 130 is installed on the side wall of the air pump supply channel, with its sensing end connected to the gas inside the channel. By measuring the pressure of the gas flowing through the channel, it indirectly reflects the real-time pressure status within the second receiving chamber. The operator can adjust the air pump output power or the pressure regulating mechanism 100 based on the pressure value displayed on the pressure gauge 130 to dynamically maintain the pressure within the second receiving chamber within a preset range.

[0068] Compared to existing technologies, traditional coffee machines do not separate the air pump supply path from the gas cylinder supply system. Sudden changes in gas cylinder pressure can affect the stability of the air pump supply, and the pressure monitoring device is usually located far from the brewing chamber, resulting in data lag. This solution isolates the air pump supply path through an independent channel, eliminating interference from external gas sources. Simultaneously, it integrates the pressure gauge 130 into the supply channel, shortening the physical distance between the pressure detection point and the brewing chamber, thus improving the real-time nature of data feedback.

[0069] Through the above technical solution, this application solves the problem of pressure regulation error caused by the design defects of the air pump supply and pressure monitoring structure, realizes precise control of the pressure in the second containment chamber, and ensures that the coffee powder completes the segmented extraction process under stable pressure.

[0070] This application further proposes to add a safety relief valve 170 to the air pressure regulating assembly 140. The safety relief valve 170 is located in the first receiving cavity and is connected to the second receiving cavity of the brewing mechanism 110. A third sealing ring is provided at the connection between the two.

[0071] The safety relief valve 170 is a mechanical pressure relief device, specifically implemented using a spring-loaded valve core structure. It automatically opens the pressure relief channel when the detected pressure exceeds a preset threshold. The first receiving cavity refers to the internal space of the housing 120 of the pressure regulating mechanism 100, used for the centralized installation of the air pressure control components. Its airtightness is achieved through the assembly of the housing 120 with each component. The second receiving cavity refers to the space in the brewing mechanism 110 used to house the coffee powder compartment and water storage compartment, which is connected to the air pressure regulating component 140 via an air guide channel. The third sealing ring is an annular seal installed at the connection between the safety relief valve 170 and the second receiving cavity. It can be made of high-temperature resistant silicone or fluororubber material to prevent high-pressure gas leakage.

[0072] Specifically, the safety relief valve 170 monitors the pressure in the second receiving chamber in real time through a mechanical structure. When the pressure exceeds a preset safety value during brewing, the valve core moves against the spring force under the action of pressure difference, opening the pressure relief channel and allowing high-pressure gas to be discharged to the outside. The third sealing ring maintains the airtightness of the connection within the normal pressure range, preventing gas leakage from the interface between the pressure relief valve and the second receiving chamber. During pressure relief, the opening action of the safety relief valve 170 is only directed to the overpressure portion, avoiding impact on other components of the brewing mechanism 110.

[0073] Compared to existing technologies, traditional coffee machines rely on a single pressure regulating mechanism 100 to control the water tank pressure, lacking an independent overpressure protection mechanism. This makes them prone to seal failure or component damage during sudden pressure surges. In contrast, this solution integrates a mechanical safety pressure relief valve 170, providing redundant protection in case of pressure regulating component failure. Furthermore, a third sealing ring ensures reliable connection between the pressure relief valve and the brewing mechanism 110, forming a dual pressure control system.

[0074] Through the above technical solution, this application effectively solves the equipment safety hazards caused by pressure runaway during the high-pressure extraction process of coffee machines. The mechanical pressure relief protection mechanism avoids the risk of seal ring rupture or structural deformation, while maintaining the stability of the pressure control system and ensuring the safety and consistency of the coffee extraction process.

[0075] This application further discloses a coffee machine, including a rapid exhaust valve 180 disposed in a first receiving cavity within a housing 120. The rapid exhaust valve 180 is connected and communicates with a second receiving cavity of a brewing mechanism 110 via a sealing ring. The rapid exhaust valve 180 includes a tube body and a locking block. An exhaust hole is provided on the side wall of the tube body. The locking block is threadedly mounted on a valve body 190. When the locking block is screwed into the tube body, it closes the exhaust hole; when screwed out, it allows the exhaust hole to communicate with the outside, forming a pressure relief channel.

[0076] Among them, the quick exhaust valve 180 refers to the control device for directly discharging high-pressure gas. Specifically, it can be implemented by using a mechanical valve with an adjustable sealing structure, and the opening and closing of the channel is controlled by the depth of thread screwing in.

[0077] The tube body refers to the hollow component that forms the gas flow path. It can be made of stainless steel or aluminum alloy, and the side wall has an exhaust hole as a pressure relief outlet.

[0078] The locking block is a sealing component that adjusts its position through a threaded connection. It can be made of copper and machined into a cylindrical structure, with threads on its outer surface to mate with the valve body 190. The vent hole is a radial through-hole located on the side wall of the pipe body. It can be a circular hole with a diameter of 1.5mm to 3mm, and there can be 2 to 4 holes evenly distributed circumferentially. The fourth sealing ring is an annular sealing element located at the connection between the quick-release valve 180 and the second receiving cavity. It can be made of fluororubber and achieves an airtight seal through compression deformation.

[0079] Specifically, when a rapid reduction in pressure within the second receiving chamber is required, the locking block is rotated to axially disengage from the tube along its thread. This creates a gap between the locking block and the tube, allowing high-pressure gas to be directly released into the atmosphere through the vent. The sealing ring maintains a tight seal at the connection, preventing gas leakage from the interface. When it is necessary to restore the working pressure, the locking block is rotated in the opposite direction to screw its threads into the tube until the vent is completely sealed.

[0080] Compared to existing technologies, traditional coffee machines rely solely on spring-loaded or pull-out structures, resulting in insufficient sealing. This solution, however, utilizes a threaded mechanical venting structure to actively control the opening and closing of the pressure relief channel, achieving immediate and controllable pressure release.

[0081] Through the above technical solution, this application can actively release the high-pressure gas in the second containment chamber according to the needs of the extraction stage, avoiding over-extraction of coffee powder caused by pressure overshoot, and preventing safety hazards caused by overpressure in the pressure vessel. The combination of the sealing ring and the threaded structure ensures pressure stability under working conditions and achieves reliable sealing for emergency pressure relief operations.

[0082] This application further proposes a quick exhaust valve 180 including a pipe body and a locking block. The pipe body is provided with a radial exhaust hole, and the locking block is threaded into the valve body 190. When the locking block is screwed into the pipe body, the locking block closes the exhaust hole. When the locking block is screwed out of the pipe body, the exhaust hole is connected to the outside atmosphere to form a pressure relief channel.

[0083] The quick exhaust valve 180 is a device used to quickly discharge gas during pressure regulation. Specifically, it can be a mechanical valve with an adjustable sealing structure, which directly controls the gas flow path through the opening and closing action of the physical structure.

[0084] The tube body refers to the cylindrical cavity component that forms the gas flow path. It can be made of metal or pressure-resistant plastic, and its radial exhaust holes form the physical basis of the pressure relief channel.

[0085] The locking block is an adjusting component used to achieve sealing and opening actions. Specifically, it can be a metal block with a threaded fit. Its screwing-in action forms a mechanical seal by pressing the end face, and its unscrewing action releases the sealing state.

[0086] Among them, threaded fit refers to the connection method that achieves axial displacement adjustment through the meshing of internal and external threads. Specifically, it can be achieved by using standard trapezoidal threads or triangular threads, and the pitch size can be selected according to the operational accuracy requirements.

[0087] Among them, the pressure relief channel refers to the path through which gas is released from the high-pressure area to the outside. Specifically, it can be formed by the change in the positional relationship between the exhaust port and the locking block. When the locking block is rotated out, the exhaust port is exposed to the atmospheric environment, forming a connecting channel.

[0088] Specifically, during the operation of the coffee machine, when it is necessary to quickly release the pressure in the second receiving chamber, the locking block is moved axially along the threaded engagement structure of the valve body 190 by rotation. When the locking block is screwed out of the tube, the contact area between its end and the inner wall of the tube decreases, allowing the radially arranged vent hole to connect with the outside atmosphere. At this time, high-pressure gas is discharged outward through the vent hole, forming a pressure relief channel. When the locking block is screwed into the tube, its end face completely covers the vent hole, forming a mechanical seal through direct contact of the metal end faces, preventing gas leakage. The threaded engagement structure ensures both precise controllability of the axial displacement of the locking block and reliable switching between sealing and pressure relief states through the screwing operation.

[0089] Compared to existing technologies, traditional coffee machine pressure relief devices mostly use spring-loaded safety valves or solenoid valves. The former relies on spring preload to maintain a seal, which carries the risk of leakage due to pressure setting deviations; the latter requires external control circuitry, resulting in a complex structure and high cost. This solution uses a purely mechanical threaded locking block, which allows for manual switching of the sealing state, avoiding reliability issues associated with electrical components and simplifying the system structure.

[0090] Through the above technical solution, this application achieves rapid and proactive release of the coffee machine's working pressure, solving the problem of extraction pressure fluctuations caused by delayed pressure regulation. The combination of a mechanical seal and threaded adjustment ensures the immediacy and controllability of the pressure release action, preventing over-extraction of coffee grounds due to untimely pressure release. Simultaneously, the manual screw-on operation requires no external power supply, improving the convenience and reliability of the equipment.

[0091] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A coffee maker, characterized in that, include: A pressure regulating mechanism includes a housing and a pressure regulating component. A first receiving cavity is formed inside the housing. The pressure regulating component is disposed inside the first receiving cavity. The pressure regulating component includes a valve body and an adjusting rod. An air guiding cavity is formed inside the valve body. The air guiding cavity is provided with an inlet end and an outlet end that communicate with an external air source. A throttling orifice is formed at the outlet end of the air guiding cavity. The working end of the adjusting rod is provided corresponding to the throttling orifice. The brewing mechanism includes a second receiving cavity for holding a coffee powder container and a water storage container. The second receiving cavity is connected to the throttling orifice. The axial displacement of the adjusting rod can change the flow cross-sectional area between the adjusting rod and the throttling orifice.

2. A coffee maker according to claim 1, characterized in that The air pressure regulating assembly also includes an adjusting seat, which is installed on the valve body. The adjusting seat has a first threaded portion inside and a second threaded portion on the outer wall of the adjusting rod. The first threaded portion and the second threaded portion form a helical transmission pair.

3. A coffee maker according to claim 2, characterized in that The pitch of the helical drive pair is 0.7mm to 0.8mm, and the thread profile is a trapezoidal thread with self-locking characteristics.

4. A coffee maker according to claim 1 or 3, characterized in that The end of the adjusting rod is provided with a tapered adjusting head, and the tapered surface of the tapered adjusting head forms a gradually narrowing throttling channel with the inlet of the throttling orifice.

5. A coffee maker according to claim 1, characterized in that The pressure regulating assembly also includes a gas cylinder mounting base and a gas pump mounting base, which are embedded in the first receiving cavity. The gas cylinder mounting base is electrically connected to the air inlet end.

6. A coffee maker according to claim 5, characterized in that The valve body also includes an air inlet sealing seat, which is disposed at the air inlet end. One end of the air inlet sealing seat abuts against the valve body, and the other end abuts against the gas cylinder mounting seat. The two ends of the air inlet sealing seat are respectively provided with a first annular groove and a second annular groove. A first sealing ring is disposed in the first annular groove, and a second sealing ring is disposed in the second annular groove.

7. A coffee maker according to claim 5, characterized in that The air pump mounting base is provided with an independent air pump supply channel, which is connected to the second receiving cavity. The air pump supply channel is also provided with a pressure gauge, which is used to obtain the pressure in the second receiving cavity.

8. A coffee maker according to claim 1, characterized in that The pressure regulating assembly also includes a safety relief valve, which is disposed in the first receiving cavity and is connected to the second receiving cavity. A third sealing ring is provided between the safety relief valve and the second receiving cavity.

9. A coffee maker according to claim 1, characterized in that The pressure regulating component also includes a rapid exhaust valve, which is disposed in the first receiving cavity and is connected to the second receiving cavity. A fourth sealing ring is provided between the rapid exhaust valve and the second receiving cavity.

10. A coffee maker according to claim 9, characterized in that The quick exhaust valve includes a pipe body and a locking block. The pipe body is provided with a radial exhaust hole. The locking block is threaded into the valve body. When the locking block is screwed into the pipe body, the locking block closes the exhaust hole. When the locking block is screwed out of the pipe body, the exhaust hole communicates with the outside atmosphere to form a pressure relief channel.

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