Anti-backflow moka pot

Abstract

The utility model discloses a kind of backflow prevention moka pots, including the upper cavity for containing coffee liquid, the bottom of upper cavity is provided with the elastic overflow plate, the overflow passage that is communicated with the overflow passage of upper cavity and the outside of upper cavity is opened in the overflow plate, overflow passage is closed in normal state, when liquid pressure reaches preset threshold, the overflow passage is opened by the elastic deformation of the overflow plate, allowing liquid to pass. Forward flow stage: when liquid flows from bottom to top, overflow passage is automatically opened when overflow plate reaches preset threshold under the liquid pressure, so that liquid flows smoothly into upper kettle body. Backflow prevention stage: when liquid enters upper kettle body, the pressure acting on the upper side of overflow plate only comes from water pressure generated by liquid self-gravity, this pressure value is lower than overflow passage opening threshold or reversely extruding the outlet of overflow passage, so overflow passage keeps closed state. The design of the utility model reduces space occupation and liquid residue on overflow plate while realizing liquid backflow prevention.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to an anti-backflow moka pot. Background Technology

[0002] A moka pot is a traditional Italian espresso-making tool. It typically consists of an upper pot and a lower pot, with a coffee grounds chamber between them. The lower pot holds water, which, when heated, generates steam pressure that forces the hot water through the coffee grounds in the coffee grounds chamber for extraction. The upper pot collects the extracted coffee liquid.

[0003] Chinese utility model patent application number 201721645322.7 discloses an anti-backflow moka pot. The upper pot body has openings at both the top and bottom. An internal flow tube is installed in the upper pot body, with the diameter of the flow tube gradually increasing from top to bottom. The outer wall of the larger diameter end of the flow tube is sealed to the opening at the bottom of the upper pot body, while the outer wall of the smaller diameter end of the flow tube has multiple first through holes. The working principle is as follows: heating the lower pot body generates steam, and the pressure pushes the hot water through the coffee grounds in the powder chamber, extracting the coffee essence. The extracted coffee liquid enters from the bottom of the flow tube and flows out from the top back into the upper pot body.

[0004] While existing technologies can achieve the function of preventing backflow of coffee liquid through the design of the flow tube structure, this solution has two shortcomings: first, the flow tube occupies too much space in the upper pot's internal cavity, reducing the effective collection volume of coffee liquid; second, there is a problem of coffee liquid residue during the process of coffee liquid flowing through the flow tube into the upper pot. Utility Model Content

[0005] The technical problem to be solved by this utility model is to propose a backflow-proof moka pot that can reduce space occupation and coffee residue in view of the above-mentioned technical status.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a backflow-proof moka pot, characterized in that it includes an upper cavity for holding coffee liquid, and an elastic flow plate is provided at the bottom of the upper cavity. The flow plate has a flow channel connecting the upper cavity and the outside of the upper cavity. The flow channel is closed under normal conditions. When the liquid pressure reaches a preset threshold, the flow plate undergoes elastic deformation to open the flow channel, allowing the liquid to pass through.

[0007] To enhance the backflow prevention effect, preferably, the flow channel includes an upstream section and a downstream section that are connected, with the flow area at the inlet of the upstream section being larger than the flow area at the outlet of the downstream section.

[0008] Furthermore, the flow area of ​​the upstream section gradually decreases along the liquid flow direction, while the flow area of ​​the downstream section decreases with a greater gradient along the liquid flow direction than that of the upstream section.

[0009] Furthermore, the outlet of the downstream section is slit-shaped.

[0010] Specifically, the flexible configuration of the flow plate is as follows:

[0011] When liquid flows from the upstream section to the downstream section, the liquid pressure acts on the inner wall of the channel in the downstream section, driving the flow plate to elastically deform and open the slit-shaped outlet of the downstream section.

[0012] When the liquid flows in the opposite direction, the liquid pressure causes the plate surface around the downstream section to undergo reverse elastic deformation, and the flow hole is squeezed into a closed state.

[0013] In order to form a certain flow space on the upper and lower surfaces of the flow plate, preferably, the upper and lower surfaces of the flow plate have raised annular support portions.

[0014] Furthermore, the upper and lower surfaces of the flow plate have spaced support protrusions.

[0015] Preferably, the flow plate is provided with multiple flow channels, and the flow channels are arranged in a concentric ring array with the center of the flow plate as the reference.

[0016] The flow channels on each concentric ring are evenly spaced circumferentially, and the flow channels of adjacent concentric rings are offset radially.

[0017] Preferably, the anti-backflow moka pot is provided with a filter screen at both the top and bottom.

[0018] Preferably, the anti-backflow moka pot further includes an upper pot body, a lower pot body, and a base. The lower pot body is disposed on the base, and a pipe is provided inside the base. The two ends of the pipe are connected to the lower pot body and an external water tank, respectively. A water pump is provided between the pipe and the water tank. The upper pot body forms the upper cavity. The upper pot body and the lower pot body are connected by threads to form a detachable connection. The bottom of the upper pot body has an opening and the flow plate is provided at the opening. Below the flow plate, at the junction of the upper pot body and the lower pot body, a powder cavity for containing coffee powder is formed.

[0019] Compared to existing technologies, this invention uses a flow plate instead of a traditional flow tube as the anti-backflow structure. The flow channel of the flow plate only opens when the liquid pressure reaches a preset threshold. Specifically applied in an anti-backflow moka pot, it has a forward flow stage and an anti-backflow stage. Forward flow stage: When the liquid flows from bottom to top, the flow channel automatically opens when the flow plate reaches the preset threshold under liquid pressure, allowing the liquid to flow smoothly into the upper pot body. Anti-backflow stage: After the liquid enters the upper pot body, the pressure acting above the flow plate comes only from the water pressure generated by the liquid's own weight. This pressure reverses and squeezes the outlet of the flow channel, thus keeping the flow channel closed and effectively preventing liquid backflow. This design achieves anti-backflow while reducing the space occupied by the anti-backflow structure and the amount of liquid residue in the flow plate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A cross-sectional view of the upper and lower body of the pot;

[0022] Figure 3 This is an exploded view of the filter screen and flow plate according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the flow plate in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the other side of the flow plate in an embodiment of the present utility model;

[0025] Figure 6 This is a cross-sectional view of the flow plate according to an embodiment of the present utility model. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1-6 The image shows a preferred embodiment of the anti-backflow moka pot and the present invention.

[0028] The moka pot in this embodiment is like... Figure 1 and Figure 2As shown, the device includes an upper pot body 1, a lower pot body 2, and a base 6. The interior of the upper pot body 1 forms an inner cavity for collecting coffee liquid. Between the lower pot body 2 and the upper pot body 1 is a powder cavity 3 for holding coffee powder. A flow plate 4 for preventing backflow is installed above the powder cavity 3. The lower pot body 2 is mounted on the base 6. A pipe is installed inside the base 6. The two ends of the pipe are connected to a one-way valve at the bottom of the lower pot body and an external water tank, respectively. A water pump is installed between the pipe and the water tank, which can pressurize the water in the water tank into the lower pot body 2.

[0029] After the hot water boils in the lower pot 2, the steam pressure forces the hot water upwards into the coffee grounds chamber 3. After extraction, the coffee liquid passes through the filter screen 5 and enters the flow plate 4. After flowing out of the flow plate 4, the coffee liquid passes through another filter screen 5 and collects in the upper pot 1. The lower part of the upper pot 1 is open, as shown... Figure 2 and Figure 3 As shown, in this embodiment, the flow plate 4 is disposed at the lower opening of the upper pot body 1 and is sealed to it. A filter screen 5 is provided at the upper and lower parts of the flow plate 4.

[0030] The flow plate 4 is made of silicone and is elastic. A flow channel 41 is formed on the flow plate 4. The flow channel 41 is closed under normal conditions. When the liquid pressure reaches a preset threshold, the flow plate 4 undergoes elastic deformation, opening the flow channel 41 and allowing liquid to pass through. Seals are provided between the flow plate 4 and both the upper vessel 1 and the lower vessel 2, ensuring that water flow can only pass through the flow channel 41 of the flow plate 4.

[0031] like Figure 6 As shown, the flow channel 41 includes an upstream section 41a and a downstream section 41b that are connected. The flow area at the inlet of the upstream section 41a is larger than the flow area at the outlet of the downstream section 41b. The inlet of the upstream section 41a is... Figure 5 The rectangle shown has an outlet at the downstream section 41b. Figure 4 The slit shape is shown. The flow area of ​​the upstream section 41a gradually decreases along the liquid flow direction, while the flow area of ​​the downstream section 41b decreases at a greater gradient along the liquid flow direction than that of the upstream section 41a, making the flow channel 41 wedge-shaped as a whole.

[0032] The flow plate 4 is provided with multiple flow channels 41, which are arranged in a concentric ring array with the center of the flow plate 4 as the reference. The flow channels 41 on each concentric ring are evenly distributed in the circumferential direction, and the flow channels 41 of adjacent concentric rings are staggered in the radial direction.

[0033] The elasticity of the flow plate 4 is configured such that when the liquid flows from the upstream section 41a to the downstream section 41b, the liquid pressure acts on the inner wall of the channel of the downstream section 41b, driving the flow plate 4 to elastically deform to open the slit-shaped outlet of the downstream section 41b; when the liquid flows in the opposite direction, the liquid pressure causes the plate surface around the downstream section 41b to elastically deform in the opposite direction, and the flow channel is squeezed to a closed state.

[0034] In order to form a certain flow space on the upper and lower surfaces of the flow plate 4, the upper and lower surfaces of the flow plate 4 have raised annular support portions 42, and the upper and lower surfaces of the flow plate 4 have spaced support protrusions 43.

[0035] The working principle of this embodiment is as follows:

[0036] Forward flow stage: Under the action of the water pump, the hot water in the water tank is pressed into the lower pot 2 through the pipe of the base 6. The hot water flows from bottom to top through the coffee powder to extract coffee liquid. When the liquid pressure on the lower surface of the flow plate 4 reaches the preset threshold, the flow channel 41 automatically opens, allowing the liquid to flow smoothly into the upper pot 1.

[0037] Anti-backflow stage: When the liquid enters the upper vessel 1, the pressure acting on the upper flow plate 4 comes only from the water pressure generated by the liquid's own gravity. The water pressure squeezes the flow channel 41 of the flow plate 4 in the opposite direction, keeping the flow channel 41 in a closed state and effectively preventing liquid backflow.

Claims

1. A backflow-proof moka pot, characterized in that, It includes an upper cavity for holding coffee liquid, and a flexible flow plate (4) is provided at the bottom of the upper cavity. The flow plate (4) has a flow channel (41) connecting the upper cavity and the outside of the upper cavity. The flow channel (41) is closed under normal conditions. When the liquid pressure reaches a preset threshold, the flow plate (4) undergoes elastic deformation to open the flow channel (41) and allow the liquid to pass through.

2. The anti-backflow moka pot according to claim 1, characterized in that, The flow channel (41) includes an upstream section (41a) and a downstream section (41b) that are connected to each other. The flow area at the inlet of the upstream section (41a) is larger than the flow area at the outlet of the downstream section (41b).

3. The anti-backflow moka pot according to claim 2, characterized in that, The flow area of ​​the upstream section (41a) gradually decreases along the liquid flow direction, while the flow area of ​​the downstream section (41b) decreases along the liquid flow direction with a greater gradient than that of the upstream section (41a).

4. The anti-backflow moka pot according to claim 3, characterized in that, The outlet of the downstream section (41b) is slit-shaped.

5. The anti-backflow moka pot according to claim 4, characterized in that, The flow plate (4) is flexibly configured as follows: When the liquid flows from the upstream section (41a) to the downstream section (41b), the liquid pressure acts on the inner wall of the channel of the downstream section (41b), driving the flow plate (4) to elastically deform to open the slit-shaped outlet of the downstream section (41b); When the liquid flows in the reverse direction, the liquid pressure causes the plate surface around the downstream section (41b) to undergo reverse elastic deformation, and the flow passage is squeezed into a closed state.

6. The anti-backflow moka pot according to claim 4, characterized in that, The upper and lower surfaces of the flow plate (4) have raised annular support portions (42).

7. The backflow-proof moka pot according to claim 4, characterized in that, The upper and lower surfaces of the flow plate (4) have spaced support protrusions (43).

8. The anti-backflow moka pot according to claim 4, characterized in that, The flow plate (4) is provided with multiple flow channels (41), and the flow channels (41) are arranged in a concentric ring array with the center of the flow plate (4) as the reference. The flow channels (41) on each concentric ring are evenly spaced along the circumference, and the flow channels (41) of adjacent concentric rings are offset in the radial direction.

9. The anti-backflow moka pot according to claim 1, characterized in that, The flow plate (4) is provided with a filter screen (5) at the top and bottom.

10. The anti-backflow moka pot according to any one of claims 1 to 9, characterized in that, It also includes an upper pot body (1), a lower pot body (2) and a base (6). The lower pot body (2) is set on the base (6). The base (6) has a pipe inside. The two ends of the pipe are connected to the lower pot body (2) and the external water tank, respectively. A water pump is set between the pipe and the water tank. The upper pot body (1) forms the upper cavity. The upper pot body (1) and the lower pot body (2) are connected by threads to form a detachable connection. The bottom of the upper pot body has an opening and the flow plate (4) is set at the opening. Below the flow plate (4), at the junction of the upper pot body (1) and the lower pot body (2), a powder cavity for holding coffee powder is formed.

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