Pressure balancing device for coffee machine

Abstract

The utility model discloses a pressure balancing device for a coffee machine, which is matched with the coffee machine for use, the coffee machine comprises a water sump, a base and a powder bowl, the base is arranged at the bottom of the water sump, the powder bowl is arranged on the base, and the pressure balancing device comprises a one-way valve mechanism and a balancing valve mechanism which are arranged between the water sump and the base. The one-way valve mechanism forms a first channel communicated with the water sump and the base, the balance valve mechanism forms a second channel communicated with the water sump and the base, and the one-way valve mechanism and the balance valve mechanism are the same in structure and are oppositely arranged. The balance valve mechanism is additionally arranged on the basis of a traditional structure, pressure can be automatically balanced after extraction is completed, safety is high, secondary extraction or coffee powder residue cleaning can be conveniently carried out in time, and the coffee extraction device has the advantages of being convenient to operate, high in efficiency, high in safety and the like.

Description

Technical Field

[0001] This utility model relates to the field of daily necessities technology, and in particular to a pressure balancing device for a coffee machine. Background Technology

[0002] Coffee machines, as a category of small kitchen appliances, can be used to make coffee drinks and are loved by customers both at home and abroad.

[0003] Currently, the main types of coffee machines on the market include drip coffee machines, pressure coffee machines, coffee grinders, and fully automatic coffee machines, offering a wide variety of categories and functions. However, most coffee machines on the market are commercial or home-use machines, which are large in size and heavy, making them inaccessible and space-consuming, thus failing to meet the needs of people who frequently travel.

[0004] As disclosed in Chinese invention patent application CN118000583A, a portable pressure coffee machine includes: a first housing with a first receiving cavity, a first lower cavity opening, and a vent; a second housing with a second receiving cavity, a second upper cavity opening, and a second lower cavity opening, detachably connected to the first housing so that the second upper cavity opening communicates with the first lower cavity opening, and a filter screen is provided at the second lower cavity opening; and a handle with one end detachably connected to the first housing, having a gas channel communicating with the vent, the gas channel being used to introduce external air pressure, and a one-way valve at the vent opening allowing gas to flow into the first receiving cavity. This portable pressure coffee machine has the advantages of small size, light weight, detachability, and portability, and can solve the problems in the prior art, but it also has disadvantages:

[0005] As described in the prior art, in order to ensure that the hot water in the water tank can flow into the coffee tank after pressurization, while preventing backflow, existing coffee machines achieve this by setting a one-way valve. However, after extraction, since the air pressure in the coffee tank is greater than that in the water tank, the coffee bowl containing the coffee powder cannot be removed from the machine at this time. It can only be removed after the pressure in the coffee bowl is naturally released. The natural pressure release time is long and cannot meet the need to make the next cup of coffee immediately, so there is room for improvement. Utility Model Content

[0006] The purpose of this invention is to provide a pressure balancing device for coffee machines, which can at least solve one of the above-mentioned problems.

[0007] According to one aspect of the present invention, a pressure balancing device for a coffee machine is provided, which is used in conjunction with the coffee machine. The coffee machine includes a water tank, a base, and a coffee container. The base is installed at the bottom of the water tank, and the coffee container is installed on the base, forming a coffee extraction chamber between the base and the base. The pressure balancing device includes a one-way valve mechanism and a balancing valve mechanism installed between the water tank and the base. The one-way valve mechanism forms a first channel connecting the water tank and the coffee extraction chamber, and the balancing valve mechanism forms a second channel connecting the water tank and the coffee extraction chamber. The one-way valve mechanism and the balancing valve mechanism are arranged in opposite directions.

[0008] In some embodiments, the one-way valve mechanism includes a first fastener and a first valve needle, a first sealing ring, a first spring, and a first connector arranged sequentially along a first direction. The first fastener is installed in the water tank and connected to the base. The first valve needle is movably installed inside the base. The first sealing ring is fitted around the outer periphery of the first valve needle and seals against the base. The first connector is installed on the base. The first spring is fitted around the end of the first valve needle near the first connector and abuts against the first connector. Under the action of the first spring, the first valve needle maintains elastic contact with the base through the first sealing ring.

[0009] In some embodiments, the balance valve mechanism includes a second fastener and a second valve needle, a second sealing ring, a second spring, and a second connector arranged sequentially along a second direction, which is opposite to the first direction. The second fastener is installed in the water tank and connected to the base. The second valve needle is movably installed inside the second fastener. The second sealing ring is fitted around the outer periphery of the second valve needle and seals against the second fastener. The second connector is installed inside the second fastener. The second spring is fitted around the end of the second valve needle near the second connector and abuts against the second connector. Under the action of the second spring, the second valve needle maintains elastic contact with the second fastener through the second sealing ring.

[0010] In some embodiments, the first fastener has a first through hole inside, the base has a first mounting groove, a first conductive groove and a second mounting groove arranged sequentially along a first direction, the first connector has a second through hole inside, the first through hole, the first mounting groove, the first conductive groove, the second mounting groove and the second through hole together form a first channel, the first fastener is connected to the first mounting groove, the first valve needle is movably mounted in the first conductive groove and its two ends extend into the first mounting groove and the second mounting groove respectively, the first connector is mounted in the second mounting groove, and the first spring is pressed against the groove wall of the second mounting groove by the first valve needle.

[0011] In some implementations, the first fastener is threaded to the first mounting slot, and the first connector is threaded to the second mounting slot.

[0012] In some embodiments, a first conical portion is formed at the bottom of the first mounting groove, a second conical portion is formed at the top of the second mounting groove, a first guide groove connects the first conical portion and the second conical portion, a first valve needle is formed with a first limiting boss, the first end face of the first limiting boss contacts the first spring, the second end face of the first limiting boss contacts the first sealing ring, and can press the first sealing ring against the second conical portion.

[0013] In some embodiments, the base has a third through hole and a third mounting groove arranged sequentially along the second direction, the second fastener has a second guide groove and a fourth mounting groove arranged sequentially along the second direction, the second connector has a fourth through hole, the third through hole, the third mounting groove, the second guide groove, the fourth mounting groove and the fourth through hole together form a second channel, the second fastener is connected to the third mounting groove, one end of the second valve needle is movably installed in the second guide groove and the second end extends into the fourth mounting groove, the second connector is installed in the fourth mounting groove, and the second spring is pressed against the groove wall of the fourth mounting groove by the second valve needle.

[0014] In some embodiments, the second fastener is threaded to the third mounting slot, and the second connector is threaded to the fourth mounting slot.

[0015] In some embodiments, a third conical portion is formed at the bottom of the fourth mounting groove, a second guide groove connects the third conical portion and the third mounting groove, a second valve needle is formed with a second limiting boss, the first end face of the second limiting boss contacts the second spring, the second end face of the second limiting boss contacts the second sealing ring, and can press the second sealing ring against the third conical portion.

[0016] In some embodiments, the coffee machine also includes a mounting base and a third sealing ring, the third sealing ring being fitted onto the base, the mounting base supporting the coffee bowl, the mounting base being detachably connected to the lower end of the base and capable of pressing the coffee bowl against the third sealing ring.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides a novel pressure balancing device for coffee machines. This device achieves automated pressure balancing between the water tank and the coffee extraction chamber. When the water tank pressure reaches the extraction pressure, the one-way valve mechanism activates, and the first valve needle moves in the first direction, opening the first channel. Hot water from the water tank flows into the coffee extraction chamber through the first channel and mixes with the coffee grounds in the portafilter to obtain coffee liquid. After extraction, the first valve needle of the one-way valve mechanism resets under the action of the first spring, pushing the first sealing ring to block the first channel. Since the pressure in the coffee extraction chamber is greater than the pressure in the water tank, the balancing valve mechanism activates, and the second valve needle moves in the second direction, opening the second channel. Steam from the coffee extraction chamber can then flow into the water tank through the second channel. At this point, by removing the mounting base from the base, the portafilter can be directly removed for a second extraction or for cleaning the coffee grounds.

[0019] This invention adds a balancing valve mechanism to the traditional structure, which can automatically balance the pressure after extraction. It is not only highly safe, but also facilitates timely second extraction or cleaning of coffee grounds. It has many advantages such as convenient operation, high efficiency, and high safety. Attached Figure Description

[0020] Figure 1 A partial three-dimensional structural diagram of a coffee machine equipped with the pressure balancing device of this utility model;

[0021] Figure 2 for Figure 1 The diagram shows a top view of the structure.

[0022] Figure 3 for Figure 2 The schematic diagram of the cross-sectional structure along the AA direction is shown.

[0023] Figure 4 for Figure 3 The enlarged structural diagram at point B is shown below;

[0024] Figure 5 for Figure 3 The enlarged structural diagram at point C is shown.

[0025] Figures 1-5Reference numerals in the attached drawings: 100-Water tank; 200-Base; 300-Powder container; 400-Pressure balancing device; 500-Mounting base; 600-Coffee extraction chamber; 700-Third sealing ring; 1-One-way valve mechanism; 2-Balance valve mechanism; L1-First channel; L2-Second channel; 11-First fastener; 12-First valve needle; 13-First sealing ring; 14-First spring; 15-First connector; 21-Second fastener; 22-Second valve needle; 23-Second sealing ring; 24 - Second spring; 25- Second connector; 111- First through hole; 121- First limiting boss; 151- Second through hole; 211- Second guide groove; 212- Fourth mounting groove; 221- Second limiting boss; 251- Fourth through hole; 200a- First mounting groove; 200b- First guide groove; 200c- Second mounting groove; 200d- Third through hole; 200e- Third mounting groove; 200f- First tapered part; 200g- Second tapered part; 212a- Third tapered part. Detailed Implementation

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

[0027] Figures 1-5 The diagram schematically illustrates a pressure balancing device for a coffee machine according to one embodiment of the present invention.

[0028] like Figures 1-5 As shown, this pressure balancing device for coffee machines can be used with any coffee machine equipped with a one-way valve.

[0029] For ease of understanding, this embodiment only provides a structural diagram of one type of coffee machine, such as... Figure 1-5 As shown, the coffee machine of this embodiment includes a water tank 100, a base 200, and a coffee bowl 300. The base 200 is installed at the bottom of the water tank 100, and the coffee bowl 300 is installed on the base 200, forming a coffee extraction chamber 600 between the base 200 and the coffee bowl 300. The pressure balancing device 400 includes a one-way valve mechanism 1 and a balancing valve mechanism 2 installed between the water tank 100 and the base 200. The one-way valve mechanism 1 forms a first channel L1 connecting the water tank 100 and the coffee extraction chamber 600, and the balancing valve mechanism 2 forms a second channel L2 connecting the water tank 100 and the coffee extraction chamber 600. The one-way valve mechanism 1 and the balancing valve mechanism 2 are arranged in opposite directions.

[0030] Preferably, the one-way valve mechanism 1 includes a first fastener 11 and a first valve needle 12, a first sealing ring 13, a first spring 14, and a first connector 15 arranged sequentially along a first direction. The first fastener 11 is installed in the water tank 100 and connected to the base 200. The first valve needle 12 is movably installed in the base 200. The first sealing ring 13 is fitted around the outer periphery of the first valve needle 12 and seals against the base 200. The first connector 15 is installed in the base 200. The first spring 14 is fitted around the end of the first valve needle 12 near the first connector 15 and abuts against the first connector 15. Under the action of the first spring 14, the first valve needle 12 maintains elastic contact with the base 200 through the first sealing ring 13.

[0031] Preferably, the balance valve mechanism 2 includes a second fastener 21 and a second valve needle 22, a second sealing ring 23, a second spring 24, and a second connector 25 arranged sequentially along a second direction, which is opposite to the first direction. The second fastener 21 is installed in the water tank 100 and connected to the base 200. The second valve needle 22 is movably installed in the second fastener 21. The second sealing ring 23 is fitted around the outer periphery of the second valve needle 22 and seals against the second fastener 21. The second connector 25 is installed in the second fastener 21. The second spring 24 is fitted around the end of the second valve needle 22 near the second connector 25 and abuts against the second connector 25. Under the action of the second spring 24, the second valve needle 22 maintains elastic contact with the second fastener 21 through the second sealing ring 23.

[0032] Preferably, the first fastener 11 has a first through hole 111 inside, the base 200 has a first mounting groove 200a, a first guiding groove 200b and a second mounting groove 200c arranged sequentially along the first direction, and the first connector 15 has a second through hole 151 inside. The first through hole 111, the first mounting groove 200a, the first guiding groove 200b, the second mounting groove 200c and the second through hole 151 together form a first channel L1. The first fastener 11 is connected to the first mounting groove 200a, the first valve needle 12 is movably installed in the first guiding groove 200b and its two ends extend into the first mounting groove 200a and the second mounting groove 200c respectively, the first connector 15 is installed in the second mounting groove 200c, and the first spring 14 is pressed against the groove wall of the second mounting groove 200c by the first valve needle 12.

[0033] Preferably, the first fastener 11 is threadedly connected to the first mounting groove 200a, and the first connector 15 is threadedly connected to the second mounting groove 200c. This facilitates detachment.

[0034] As a further preferred embodiment, the wall of the first mounting groove 200a is provided with a first thread, and the outer wall of the first fastener 11 near the base 200 is provided with a second thread that mates with the first thread. The wall of the second mounting groove 200c is provided with a third thread, and the outer wall of the first connector 15 is provided with a fourth thread that mates with the third thread.

[0035] Preferably, a first conical portion 200f is formed at the bottom of the first mounting groove 200a, a second conical portion 200g is formed at the top of the second mounting groove 200c, a first guiding groove 200b connects the first conical portion 200f and the second conical portion 200g, a first limiting boss 121 is formed on the first end face of the first limiting boss 121, the second end face of the first limiting boss 121 contacts the first spring 14, and the first sealing ring 13 contacts the first sealing ring 13, and can press the first sealing ring 13 against the second conical portion 200g.

[0036] Preferably, the base 200 has a third through hole 200d and a third mounting groove 200e arranged sequentially along the second direction, the second fastener 21 has a second guide groove 211 and a fourth mounting groove 212 arranged sequentially along the second direction, and the second connector 25 has a fourth through hole 251. The third through hole 200d, the third mounting groove 200e, the second guide groove 211, the fourth mounting groove 212 and the fourth through hole 251 together form the second channel L2. The second fastener 21 is connected to the third mounting groove 200e. One end of the second valve needle 22 is movably installed in the second guide groove 211 and the second end extends into the fourth mounting groove 212. The second connector 25 is installed in the fourth mounting groove 212, and the second spring 24 is pressed against the groove wall of the fourth mounting groove 212 by the second valve needle 22.

[0037] As a further preferred embodiment, both the first spring 14 and the second spring 24 in this embodiment are flared springs.

[0038] Preferably, the second fastener 21 is threaded to the third mounting slot 200e, and the second connector 25 is threaded to the fourth mounting slot 212. This facilitates detachment.

[0039] As a further preferred embodiment, the wall of the third mounting groove 200e is provided with a fifth thread, and the outer wall of the second fastener 21 near the base 200 is provided with a sixth thread that mates with the fifth thread. The wall of the fourth mounting groove 212 is provided with a seventh thread, and the outer wall of the second connector 25 is provided with an eighth thread that mates with the seventh thread.

[0040] Preferably, the bottom of the fourth mounting groove 212 is formed with a third conical portion 212a, the second guide groove 211 connects the third conical portion 212a and the third mounting groove 200e, the second valve needle 22 is formed with a second limiting boss 221, the first end face of the second limiting boss 221 contacts the second spring 24, the second end face of the second limiting boss 221 contacts the second sealing ring 23, and can press the second sealing ring 23 against the third conical portion 212a.

[0041] As a further preferred embodiment, the first conical portion 200f, the second conical portion 200g, and the third conical portion 212a are conical grooves.

[0042] Preferably, the coffee machine also includes a mounting base 500 and a third sealing ring 700. The third sealing ring 700 is fitted onto the base 200. The mounting base 500 is used to support the coffee bowl 300. The mounting base 500 is detachably connected to the lower end of the base 200 and can press the coffee bowl 300 against the third sealing ring 700.

[0043] As a further preferred option, the first sealing ring 13, the second sealing ring 23, and the third sealing ring 700 can all be silicone sealing rings.

[0044] The advantages of the pressure balancing device 400 for coffee machines of this invention compared to the prior art are as follows:

[0045] This invention provides a novel pressure balancing device 400 for coffee machines. This device 400 achieves automated pressure balancing between the water tank 100 and the coffee extraction chamber 600. When the pressure in the water tank 100 reaches the extraction pressure, the one-way valve mechanism 1 activates, and the first valve needle 12 moves in a first direction, opening the first channel L1. Hot water from the water tank 100 flows through the first channel L1 into the coffee extraction chamber 600 and mixes with the coffee powder in the portafilter 300 to obtain coffee liquid. After extraction is complete, the first valve needle 12 of the one-way valve mechanism 1... The valve needle 12 is reset under the action of the first spring 14, pushing the first sealing ring 13 to block the first channel L1. Since the pressure in the coffee extraction chamber 600 is greater than the pressure in the water tank 100, the balance valve mechanism 2 works, and the second valve needle 22 moves in the second direction, so that the second channel L2 is opened. The steam in the coffee extraction chamber 600 can flow into the water tank 100 from the second channel L2. At this time, by removing the mounting base 500 from the base 200, the coffee bowl 300 can be directly removed for a second extraction or for cleaning the coffee grounds.

[0046] This invention adds a balancing valve mechanism to the traditional structure, which can automatically balance the pressure after extraction. It is not only highly safe, but also facilitates timely second extraction or cleaning of coffee grounds. It has many advantages such as convenient operation, high efficiency, and high safety.

[0047] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A pressure balancing device for a coffee machine, used in conjunction with a coffee machine, the coffee machine comprising a water tank (100), a base (200), and a portafilter (300), the base (200) being installed at the bottom of the water tank (100), the portafilter (300) being installed on the base (200) and the two forming a coffee extraction chamber (600), characterized in that, The pressure balancing device includes a one-way valve mechanism (1) and a balancing valve mechanism (2) installed between the water tank (100) and the base (200). The one-way valve mechanism (1) forms a first channel (L1) connecting the water tank (100) and the coffee extraction chamber (600), and the balancing valve mechanism (2) forms a second channel (L2) connecting the water tank (100) and the coffee extraction chamber (600). The one-way valve mechanism (1) and the balancing valve mechanism (2) are arranged in opposite directions.

2. The pressure balancing device for a coffee machine according to claim 1, characterized in that, The one-way valve mechanism (1) includes a first fastener (11) and a first valve needle (12), a first sealing ring (13), a first spring (14), and a first connector (15) arranged sequentially along a first direction. The first fastener (11) is installed in the water tank (100) and connected to the base (200). The first valve needle (12) is movably installed in the base (200). The first sealing ring (13) is fitted around the outer periphery of the first valve needle (12) and seals against the base (200). The first connector (15) is installed in the base (200). The first spring (14) is fitted around the end of the first valve needle (12) near the first connector (15) and abuts against the first connector (15). Under the action of the first spring (14), the first valve needle (12) maintains elastic contact with the base (200) through the first sealing ring (13).

3. The pressure balancing device for a coffee machine according to claim 2, characterized in that, The balance valve mechanism (2) includes a second fastener (21) and a second valve needle (22), a second sealing ring (23), a second spring (24), and a second connector (25) arranged sequentially along a second direction. The second direction is opposite to the first direction. The second fastener (21) is installed in the water tank (100) and connected to the base (200). The second valve needle (22) is movably installed in the second fastener (21). The second sealing ring (23) is fitted around the outer periphery of the second valve needle (22) and seals against the second fastener (21). The second connector (25) is installed in the second fastener (21). The second spring (24) is fitted around one end of the second valve needle (22) near the second connector (25) and abuts against the second connector (25). Under the action of the second spring (24), the second valve needle (22) maintains elastic contact with the second fastener (21) through the second sealing ring (23).

4. The pressure balancing device for a coffee machine according to claim 2, characterized in that, The first fastener (11) has a first through hole (111) inside. The base (200) has a first mounting groove (200a), a first through groove (200b), and a second mounting groove (200c) arranged sequentially along a first direction. The first connector (15) has a second through hole (151) inside. The first through hole (111), the first mounting groove (200a), the first through groove (200b), the second mounting groove (200c), and the second through hole (151) together form a total of The first channel (L1) is formed, the first fastener (11) is connected to the first mounting groove (200a), the first valve needle (12) is movably installed in the first guide groove (200b) and its two ends extend into the first mounting groove (200a) and the second mounting groove (200c) respectively, the first connector (15) is installed in the second mounting groove (200c), and the first spring (14) is pressed against the groove wall of the second mounting groove (200c) by the first valve needle (12).

5. The pressure balancing device for a coffee machine according to claim 4, characterized in that, The first fastener (11) is threadedly connected to the first mounting groove (200a), and the first connector (15) is threadedly connected to the second mounting groove (200c).

6. The pressure balancing device for a coffee machine according to claim 4, characterized in that, The bottom of the first mounting groove (200a) is formed with a first conical portion (200f), and the top of the second mounting groove (200c) is formed with a second conical portion (200g). The first guide groove (200b) connects the first conical portion (200f) and the second conical portion (200g). The first valve needle (12) is formed with a first limiting boss (121). The first end face of the first limiting boss (121) is in contact with the first spring (14), and the second end face of the first limiting boss (121) is in contact with the first sealing ring (13), and can press the first sealing ring (13) against the second conical portion (200g).

7. The pressure balancing device for a coffee machine according to claim 3, characterized in that, The base (200) has a third through hole (200d) and a third mounting groove (200e) arranged sequentially along the second direction. The second fastener (21) has a second guide groove (211) and a fourth mounting groove (212) arranged sequentially along the second direction. The second connector (25) has a fourth through hole (251) inside. The third through hole (200d), the third mounting groove (200e), the second guide groove (211), the fourth mounting groove (212) and... The fourth through hole (251) together form the second channel (L2), the second fastener (21) is connected to the third mounting groove (200e), one end of the second valve needle (22) is movably installed in the second guide groove (211), and the second end extends into the fourth mounting groove (212), the second connector (25) is installed in the fourth mounting groove (212), and the second spring (24) is pressed against the groove wall of the fourth mounting groove (212) by the second valve needle (22).

8. The pressure balancing device for a coffee machine according to claim 7, characterized in that, The second fastener (21) is threaded to the third mounting groove (200e), and the second connector (25) is threaded to the fourth mounting groove (212).

9. The pressure balancing device for a coffee machine according to claim 7, characterized in that, The bottom of the fourth mounting groove (212) is formed with a third conical part (212a), the second guide groove (211) connects the third conical part (212a) and the third mounting groove (200e), the second valve needle (22) is formed with a second limiting boss (221), the first end face of the second limiting boss (221) is in contact with the second spring (24), the second end face of the second limiting boss (221) is in contact with the second sealing ring (23), and can press the second sealing ring (23) against the third conical part (212a).

10. The pressure balancing device for a coffee machine according to any one of claims 1-9, characterized in that, The coffee machine also includes a mounting base (500) and a third sealing ring (700). The third sealing ring (700) is fitted onto the base (200). The mounting base (500) is used to support the coffee bowl (300). The mounting base (500) is detachably connected to the lower end of the base (200) and can press the coffee bowl (300) against the third sealing ring (700).

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