A brewing head for quickly clearing the clogged filter of a fully automatic coffee machine by reverse flushing

Abstract

The present invention discloses a brewing head for quickly clearing a clogged filter screen of a fully automatic coffee machine by reverse flushing. The flushing chamber and the coffee brewing chamber are arranged on the brewing head base in parallel with each other and are both located above the filter screen of the brewing head. The plug is elastically supported in the flushing chamber to form a first one-way valve core. The free end of the first one-way valve core abuts against the inner cavity wall of the flushing chamber and closes the flushing chamber. The sealing body is elastically supported in the coffee brewing chamber to form a second one-way valve core. The free end of the second one-way valve core abuts against the inner cavity wall of the coffee brewing chamber and closes the coffee brewing chamber. During the coffee brewing process, the coffee solution flushes the filter screen of the brewing head in the positive direction, and the filter screen of the brewing head has been partially loosened after flushing in the positive direction. The flushing liquid flushes the filter screen of the brewing head to realize reverse flushing of the filter screen of the brewing head, and performs reverse cleaning, which can achieve a relatively ideal filter cleaning effect, and no manual disassembly and manual operation are required, which reduces labor intensity and greatly improves efficiency.

Description

Technical field:

[0001] The present invention relates to the technical field of beverage machines, and in particular to a brewing head of a coffee machine. Background technology:

[0002] There are several core components in a fully automatic coffee machine: bean grinding group, brewing assembly, heating assembly, water system and slag discharge assembly, etc. Therefore, to brew a good cup of coffee, it is necessary to control the coarseness ratio of coffee bean grinds, extraction pressure, temperature and flow rate, etc. Because the powder has a certain coarseness ratio, a small amount of fine powder will flow through the brewing head of the brewer under the action of extraction pressure and enter the coffee. The brewing head has small holes arranged in a certain ratio, and most of the coffee powder is still blocked by the brewing head at the powder cake end. In this way, there is a certain phenomenon that over time, a small amount of fine powder will be blocked in the small holes of the brewing head.

[0003] Fully automatic coffee machines have strict regulations. Every certain number of cups, the brewer must be cleaned with a special tablet. Because the main component of the tablet is citric acid, it has a certain dissolving effect on coffee stains but is basically ineffective against fine coffee particles. Therefore, fine particles will still form a blockage. Slowly, the number of blocked holes around the blocked small hole gradually increases, forming a local area blockage, seriously affecting the quality of coffee extraction and eventually causing the coffee machine to malfunction.

[0004] Because of the presence of fine coffee powder, it is inevitable that the filter mesh of the brewing head will be clogged. Moreover, when the clog occurs, the direction of the coffee or cleaning flow is unidirectional, that is, it is all in the direction of the coffee outlet, lacking some liquid cleansing effect. It is like washing clothes, you have to wash left and right continuously to wash the clothes clean. With unidirectional flow, sometimes it is difficult to unclog the holes no matter how high the pressure is.

[0005] There are two main ways to deal with congestion:

[0006] 1) Disassemble the brewer, soak the brewing head filter with tablets and then use a brush to dredge it, which is time-consuming, laborious and troublesome;

[0007] 2) Without disassembling the brewer, brush the surface of the brewer back and forth with a fine-bristled brush so that some of the blocked holes with protruding particles on the surface can be brushed away, thereby clearing the blockage. However, some non-protruding blocked holes are still not cleared, and there are also inconvenient operating space and angles.

[0008] Therefore, it is necessary to improve the existing technology to solve the shortcomings of the existing technology. Summary of the invention:

[0009] The present invention provides a brewing head for quickly unclogging a filter screen of a fully automatic coffee machine by reverse flushing. The present invention uses a flushing liquid to reverse flush the filter screen of the brewing head to unblock it, which is equivalent to introducing a flushing force in the reverse direction. Under the flushing force of both the positive and reverse directions, blocked particles can be loosened more easily and unblocked.

[0010] The technical solutions adopted in the present invention are:

[0011] A brewing head for quickly clearing a clogged filter screen of a fully automatic coffee machine by reverse flushing, comprising a brewing head body, a brewing head base and a brewing head filter screen, wherein the brewing head base is fixed to the brewing head body, the brewing head filter screen is fixed to the brewing head base, and further comprising a flushing chamber, a coffee brewing chamber, a plug and a sealing body, wherein the flushing chamber and the coffee brewing chamber are arranged on the brewing head base in parallel with each other and are both located above the brewing head filter screen, the plug is elastically supported in the flushing chamber and forms a first one-way valve core, the free end of the first one-way valve core abuts against the inner cavity wall of the flushing chamber and closes the flushing chamber; the top port of the flushing chamber is connected to The flushing liquid pushes up the first one-way valve core in the flushing chamber and opens the flushing chamber, and the flushing liquid rushes to the brewing head filter from the bottom port of the flushing chamber and cleans the brewing head filter; the sealing body is elastically supported in the coffee brewing chamber and forms a second one-way valve core, and the free end of the second one-way valve core abuts against the inner cavity wall of the coffee brewing chamber and closes the coffee brewing chamber; the coffee solution mixed with coffee powder rushes into the bottom port of the coffee brewing chamber from the bottom of the brewing head filter, and the coffee solution pushes up the second one-way valve core in the coffee brewing chamber and opens the coffee brewing chamber, and the coffee solution is discharged from the top port of the coffee brewing chamber.

[0012] Furthermore, a backwash channel is sealed and connected on the brewing head base, and the flushing cavity includes an upper flushing hole penetrating the backwash channel and a flushing interface penetrating the brewing head base, and the flushing interface and the upper flushing hole are both stepped hole structures, and the upper flushing hole is arranged along the axial direction of the backwash channel, including an upper hole portion, a lower hole portion and an intermediate cylindrical hole that penetrate each other, the lower hole portion and the upper hole portion are arranged at both ends of the intermediate cylindrical hole, the diameters of the upper hole portion and the lower hole portion are both larger than the diameter of the intermediate cylindrical hole, and the lower hole portion is sealed and connected to the flushing interface.

[0013] Furthermore, the plug passes through the flushing interface and extends into the lower hole portion, a plug compression spring and a plug retaining ring are sleeved on the plug, the upper end of the plug compression spring abuts against the plug retaining ring, and the lower end abuts against the brewing head base, the bottom free end of the plug abuts against the step surface of the flushing interface through the plug compression spring, and the bottom free end of the plug closes the flushing interface.

[0014] Furthermore, the flushing plug is a T-shaped structure having a pin shaft portion and a base portion, the pin shaft portion passes through the flushing interface and extends into the lower hole portion, the plug compression spring and the plug retaining ring are both sleeved on the pin shaft portion, and a positioning platform is provided at the end of the pin shaft portion, the plug retaining ring is axially positioned on the pin shaft portion through the positioning platform, and the base portion abuts against the step surface of the flushing interface.

[0015] Furthermore, an inlet joint is sealed in the upper hole portion, and the inlet joint comprises an outer sleeve body and an inner tube body which are coaxial and fixed to each other.

[0016] Furthermore, a joint pressing plate is provided in the brewing head body, the inner tube body on the inlet joint passes through the joint pressing plate, and the step surface between the upper hole portion and the middle cylindrical hole presses the outer sleeve against the joint pressing plate.

[0017] Furthermore, a coffee outlet channel is provided on the brewing head base, and the coffee brewing chamber is arranged in the axial direction of the coffee outlet channel.

[0018] Furthermore, the coffee brewing chamber is a step hole structure, and a coffee pressure storage spring and a coffee outlet plug are provided inside the coffee brewing chamber. The coffee outlet plug is sealed and fixed at the lower port of the coffee brewing chamber, and a coffee flow channel is provided in the axial direction of the coffee outlet plug. The coffee flow channel is connected with the coffee brewing chamber, and the upper end of the coffee pressure storage spring abuts against the step surface of the coffee brewing chamber, and the lower end abuts the bottom free end of the sealing body against the coffee outlet plug, thereby sealing the coffee flow channel.

[0019] Furthermore, the sealing body is a sealing ball structure.

[0020] Furthermore, a groove portion is provided on the bottom surface of the brewing head base, the brewing head filter is an arc-shaped structure, a fixing hole is provided at the circular portion of the brewing head filter, the brewing head filter is fixed to the brewing head base by screw connection, and a cavity is formed between the inner arc surface of the brewing head filter and the groove portion.

[0021] The present invention has the following beneficial effects:

[0022] 1) The regular backwashing method is very convenient to implement and can be operated with one button. In addition, the waste water from the backwashing flows directly into the waste water box without the need for secondary cleaning.

[0023] 2) The blocked holes have been loosened after being soaked in the tablets, and have been partially loosened after being flushed in the forward direction. Then, cleaning in the reverse direction can achieve a relatively ideal effect. There is no need for manual disassembly and manual operation, which reduces labor intensity and greatly improves efficiency.

[0024] 3) Reduce coffee stains and coffee scale, making coffee more hygienic: Once there is a blockage, it will gradually form a regional blockage. The flow rate of coffee liquid in this area is also slower, making it easier to form coffee stains and scale. If it lasts for a long time, it will breed mold. Therefore, by introducing backwashing, coffee can be made more hygienic. Description of the drawings:

[0025] Figure 1 It is a cross-sectional structural diagram of the present invention.

[0026] Figure 2 It is an exploded view of the present invention.

[0027] Figure 3 This is a structural diagram of the flushing interface on the brewing head base in the present invention.

[0028] Figure 4 This is a structural diagram of the flushing interface on the brewing head base of the present invention.

[0029] Figure 5 It is a structural diagram of the inlet joint in the present invention.

[0030] Figure 6 It is a structural diagram of the present invention when brewing coffee.

[0031] Figure 7 It is a structural diagram of the present invention during cleaning. Specific implementation method:

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Embodiment 1:

[0034] like Figure 1 and Figure 2 The present invention discloses a brewing head for quickly clearing a clogged filter screen of a fully automatic coffee machine by reverse flushing, comprising a brewing head body 1, a brewing head base 2 and a brewing head filter screen 3, wherein the brewing head base 2 is fixed on the brewing head body 1, and the brewing head filter screen 3 is fixed on the brewing head base 2.

[0035] A flushing chamber 410 and a coffee brewing chamber 510 are arranged on the brewing head base 2. The flushing chamber 410 and the coffee brewing chamber 510 are both arranged vertically and are both located above the brewing head filter 3. A plug 42 and a sealing body 53 are respectively arranged in the flushing chamber 410 and the coffee brewing chamber 510. The plug 42 is elastically supported in the flushing chamber 410 to form a first one-way valve core, and the bottom free end of the first one-way valve core abuts against the inner cavity wall of the flushing chamber 410 to close the flushing chamber 410; the sealing body 53 is elastically supported in the coffee brewing chamber 510 to form a second one-way valve core, and the bottom free end of the second one-way valve core abuts against the inner cavity wall of the coffee brewing chamber 510 to close the coffee brewing chamber 510.

[0036] A flushing liquid is connected to the top port of the flushing chamber 410, and the flushing liquid pushes open the first one-way valve core in the flushing chamber 410 and opens the flushing chamber 410, and the flushing liquid rushes to the brewing head filter 3 from the bottom port of the flushing chamber 410 and cleans the brewing head filter 3. The coffee solution mixed with coffee powder rushes into the bottom port of the coffee brewing chamber 510 from below the brewing head filter 3, and the coffee solution pushes open the second one-way valve core in the coffee brewing chamber 510 and opens the coffee brewing chamber 510, and the coffee solution is discharged from the top port of the coffee brewing chamber 510.

[0037] Combination Figures 4 to 6 The structure of the plug 42 forming the first one-way valve core in the flushing chamber 410 in the present invention is described in detail below:

[0038] A backwash channel 41 is sealed and fixed on the brewing head base 2. In the present invention, the flushing chamber 410 includes an upper flushing hole penetrating the backwash channel 41 and a flushing interface 21 penetrating the brewing head base 2. The upper flushing hole and the flushing interface 21 are step hole structures.

[0039] The upper flushing hole is arranged along the axial direction of the backwashing channel 41, and includes an upper hole portion 411, a lower hole portion 412 and a middle cylindrical hole 413 which are coaxially arranged and interconnected, wherein the lower hole portion 412 and the upper hole portion 411 are placed at both ends of the middle cylindrical hole 413, and the diameters of the upper hole portion 411 and the lower hole portion 412 are both larger than the diameter of the middle cylindrical hole 413, the lower hole portion 412 is sealed and connected to the flushing interface 21, and the plug 42 passes through the flushing interface 21 and is elastically supported in the lower hole portion 412.

[0040] In order to facilitate elastically supporting the plug 42 in the flushing chamber 410, a plug compression spring 43 and a plug retaining ring 44 are sleeved on the plug 42, the upper end of the plug compression spring 43 abuts on the plug retaining ring 44, and the lower end of the plug compression spring 43 abuts on the brewing head base 2, the plug 42 is elastically supported in the flushing chamber 410 by the plug compression spring 43, and the bottom free end of the plug 42 abuts on the step surface of the flushing interface 21, and the bottom free end of the plug 42 closes the flushing interface 21.

[0041] To facilitate positioning and installation, the plug 42 is a T-shaped structure, including a pin shaft portion 421 and a base portion 422. The pin shaft portion 421 passes through the flushing interface 21 and extends into the lower hole portion 412. The base portion 422 is placed in the flushing interface 21. The plug compression spring 43 and the plug retaining ring 44 are both sleeved on the pin shaft portion 421. A positioning platform 423 is provided at the end of the pin shaft portion 421. The plug retaining ring 44 is axially positioned on the pin shaft portion 421 through the positioning platform 423. The base portion 422 contacts the step surface of the flushing interface 21. To ensure good sealing, an O-ring is sleeved at the position of the base portion 422 at the end of the plug 42, and the O-ring contacts the step surface of the flushing interface 21 to form a seal.

[0042] A flushing hose 4100 is connected to the liquid inlet at the upper end of the backwash channel 41, and a water pump is connected to the flushing hose 4100. The water pump is used to inject pressurized flushing liquid into the backwash channel 41, and then push open the plug 42 to make the flushing cavity 410 in a through state.

[0043] In order to facilitate the access of the flushing hose 4100 to the flushing cavity 410 , an inlet connector 6 is sealed and connected in the upper hole portion 411 , and the flushing hose 4100 is sealed and connected to the inlet connector 6 .

[0044] The specific structure of the inlet connector 6 is as follows: the inlet connector 6 comprises an outer casing 61 and an inner tube 62, wherein the outer casing 61 is fixed on the inner tube 62. The flushing hose 4100 is sealedly connected to the inner tube 62.

[0045] In order to facilitate the positioning and installation of the backwash channel 41 and the inlet joint 6, a joint pressing plate 7 is provided in the brewing head body 1. The inner tube body 62 on the inlet joint 6 passes through the joint pressing plate 7. The step surface of the upper hole portion 411 presses the outer shell 61 against the joint pressing plate 7.

[0046] The structure of the sealing body 53 forming the second one-way valve core in the coffee brewing chamber 510 in the present invention is described in detail below:

[0047] A coffee outlet channel 22 is provided on the brewing head base 2 . The coffee outlet channel 22 is parallel to the flushing interface 21 . The coffee outlet channel 22 and the brewing head base 2 are integrally formed. The coffee brewing chamber 510 is arranged in the axial direction of the coffee outlet channel 22 .

[0048] The coffee brewing chamber 510 is a step hole structure, in which a coffee pressure storage spring 51 and a coffee outlet plug 52 are provided. The coffee outlet plug 52 is sealed and fixed at the lower port of the coffee brewing chamber 510, and a coffee flow channel 520 is provided in the axial direction of the coffee outlet plug 52. The coffee flow channel 520 is connected with the coffee brewing chamber 510. The upper end of the coffee pressure storage spring 51 abuts against the step surface of the coffee brewing chamber 510, and the lower end abuts the sealing body 53 against the coffee outlet plug 52, thereby sealing the coffee flow channel 520.

[0049] The sealing body 53 is a sealing ball structure, and the sealing body 53 and the coffee pressure storage spring 51 are fixed by welding.

[0050] A groove portion 20 is provided on the bottom surface of the brewing head base 2 , and a flushing interface 21 and a coffee outlet channel 22 are both provided in the groove portion 20 , and the flushing interface 21 and the coffee outlet channel 22 are both provided along the axial direction of the brewing head base 2 .

[0051] The brewing head filter 3 in the present invention is an arc-shaped structure, a fixing hole is provided at the circular part of the brewing head filter 3, the brewing head filter 3 is fixed to the brewing head base 2 by screws, and a cavity is formed between the inner arc surface of the brewing head filter 3 and the groove part 20. The brewing head filter 3 is an arc-shaped structure, which can prevent the brewing head filter 3 from directly fitting with the flushing interface 21 and the coffee outlet channel 22, and further prevent the brewing head filter 3 from being blocked.

[0052] To ensure better sealing, sealing rings are provided between the brewing head base 2 and the backwash channel 41 and between the coffee outlet plug 52 and the brewing head base 2 .

[0053] Combination Figure 6 and Figure 7 , the cleaning process of the present invention is described in detail below:

[0054] When the fully automatic coffee machine is brewing coffee, a brewing chamber 9 for brewing coffee powder is installed below the brewing head body 1. The brewing chamber structure and principle of brewing coffee involved in the present invention are all prior arts. Therefore, for the coffee brewing process, the present invention only introduces the solution path, and does not elaborate on the specific brewing process.

[0055] When brewing coffee, the coffee solution mixed with coffee powder is poured into the coffee brewing chamber 510 from below the brewing head filter 3, and the sealing body 53 is pushed open to open the coffee brewing chamber 510, and the coffee solution is discharged from the outlet at the top of the coffee brewing chamber 510.

[0056] During the coffee brewing process, the compression spring pressure of the plug compression spring 43 ensures that the plug 42 always contacts the step surface of the flushing interface 21, so that the flushing chamber 410 is closed to prevent coffee from flowing into the flushing channel during coffee making or cleaning.

[0057] When it is necessary to clean and use, the brewing chamber 9 is removed, and a water receiving tray is placed under the brewing head body 1. The flushing liquid (usually hot water) is flushed into the flushing chamber 410 through the flushing hose 4100. After the flushing liquid enters the flushing chamber 410, the pressure of the flushing liquid pushes open the plug compression spring 43 and flows into the brewing head base 2, and then flows out from the brewing head filter 3. A water receiving tray is set under the brewing head body 1, and the waste water flowing out of the brewing head filter 3 is collected by the water receiving tray. At the same time, because the coffee brewing chamber 510 is sealed by the coffee pressure storage spring 51 and the sealing body 53, and it is ensured that the flushing liquid push-opening force is less than the elastic force of the coffee pressure storage spring 51, the flushing liquid will not flow into the coffee brewing chamber 510.

[0058] During the coffee brewing process, the coffee solution passes through the brewing head filter 3, which is also a process of flushing the brewing head filter 3, that is, flushing the brewing head filter 3 in the positive direction. The blocked holes in the brewing head filter 3 have been loosened after being soaked in the tablet (coffee solution) and have been partially loosened after flushing in the positive direction.

[0059] The flushing liquid flushes toward the brewing head filter 3 to realize reverse flushing of the brewing head filter 3. The reverse direction cleaning can achieve a relatively ideal effect, and there is no need to manually disassemble and perform manual operations, which reduces labor intensity and greatly improves efficiency.

[0060] Embodiment 2:

[0061] In this embodiment, the backwash channel 41 and the brewing head base 2 are made into an integrated structure, the coffee outlet channel 22 is sealed and connected to the brewing head base 2, and the installation of the remaining structures is the same as that of the embodiment 1.

[0062] Embodiment 3:

[0063] In this embodiment, the backwash channel 41 and the coffee outlet channel 22 are formed integrally with the brewing head base 2, and the installation of the remaining structures is the same as that of the first embodiment.

[0064] Embodiment 4:

[0065] In this embodiment, the backwash channel 41 and the coffee outlet channel 22 are both sealed and connected to the brewing head base 2, and the installation of the remaining structures is the same as that of the embodiment 1.

[0066] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A brewing head for quickly clearing a clogged filter screen of a fully automatic coffee machine by reverse flushing, comprising a brewing head body (1), a brewing head base (2) and a brewing head filter screen (3), wherein the brewing head base (2) is fixed on the brewing head body (1), and the brewing head filter screen (3) is fixed on the brewing head base (2), and characterized in that: The invention also comprises a flushing chamber (410), a coffee brewing chamber (510), a plug (42) and a sealing body (53); the flushing chamber (410) and the coffee brewing chamber (510) are arranged on the brewing head base (2) in parallel with each other and are both located above the brewing head filter (3); the plug (42) is elastically supported in the flushing chamber (410) and forms a first one-way valve core; the free end of the first one-way valve core contacts the inner wall of the flushing chamber (410) and closes the flushing chamber (410); the top end of the flushing chamber (410) is connected to a flushing liquid, and the flushing liquid pushes open the first one-way valve core in the flushing chamber (410) and opens the flushing chamber (410), thereby flushing the coffee brewing chamber (510). The liquid rushes from the bottom port of the flushing chamber (410) to the brewing head filter (3) and cleans the brewing head filter (3); the sealing body (53) is elastically supported in the coffee brewing chamber (510) and forms a second one-way valve core, the free end of the second one-way valve core abuts against the inner cavity wall of the coffee brewing chamber (510) and closes the coffee brewing chamber (510); the coffee solution mixed with coffee powder rushes from the bottom of the brewing head filter (3) into the bottom port of the coffee brewing chamber (510), the coffee solution pushes open the second one-way valve core in the coffee brewing chamber (510) and opens the coffee brewing chamber (510), and the coffee solution is discharged from the top port of the coffee brewing chamber (510).

2. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 1, characterized in that: A backwash channel (41) is sealed and connected to the brewing head base (2); the flushing chamber (410) comprises an upper flushing hole penetrating the backwash channel (41) and a flushing interface (21) penetrating the brewing head base (2); the flushing interface (21) and the upper flushing hole are both step hole structures; the upper flushing hole is arranged along the axial direction of the backwash channel (41); the upper flushing hole comprises an upper hole portion (411), a lower hole portion (412) and a middle cylindrical hole (413) which are interconnected; the lower hole portion (412) and the upper hole portion (411) are arranged at two ends of the middle cylindrical hole (413); the diameters of the upper hole portion (411) and the lower hole portion (412) are both larger than the diameter of the middle cylindrical hole (413); the lower hole portion (412) is sealed and connected to the flushing interface (21).

3. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 2, characterized in that: The plug (42) passes through the flushing interface (21) and extends into the lower hole (412). A plug compression spring (43) and a plug retaining ring (44) are sleeved on the plug (42). The upper end of the plug compression spring (43) abuts against the plug retaining ring (44), and the lower end abuts against the brewing head base (2). The bottom free end of the plug (42) abuts against the step surface of the flushing interface (21) through the plug compression spring (43), and the bottom free end of the plug (42) closes the flushing interface (21).

4. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 3, characterized in that: The plug (42) is a T-shaped structure having a pin shaft portion (421) and a base portion (422); the pin shaft portion (421) passes through the flushing interface (21) and extends into the lower hole portion (412); the plug compression spring (43) and the plug retaining ring (44) are both sleeved on the pin shaft portion (421); a positioning platform (423) is provided at the end of the pin shaft portion (421); the plug retaining ring (44) is axially positioned on the pin shaft portion (421) by the positioning platform (423); and the base portion (422) abuts against the step surface of the flushing interface (21).

5. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 2, characterized in that: An inlet joint (6) is sealedly connected inside the upper hole portion (411), and the inlet joint (6) comprises an outer sleeve (61) and an inner tube (62) that are coaxial and fixed to each other.

6. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 5, characterized in that: A joint pressing plate (7) is provided inside the brewing head body (1); the inner tube body (62) on the inlet joint (6) passes through the joint pressing plate (7); and the stepped surface between the upper hole portion (411) and the middle cylindrical hole (413) causes the outer shell (61) to contact the joint pressing plate (7).

7. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 1, characterized in that: The brewing head base (2) is provided with a coffee outlet channel (22), and the coffee brewing chamber (510) is arranged in the axial direction of the coffee outlet channel (22).

8. The back-flushing and rapid unclogging of a brewing head of a fully automatic coffee machine filter screen as claimed in claim 7, characterized in that: The coffee brewing chamber (510) is a stepped hole structure. A coffee pressure accumulating spring (51) and a coffee outlet plug (52) are arranged in the coffee brewing chamber (510). The coffee outlet plug (52) is sealed and fixed at the lower port of the coffee brewing chamber (510). A coffee flow channel (520) is arranged in the axial direction of the coffee outlet plug (52). The coffee flow channel (520) is connected with the coffee brewing chamber (510). The upper end of the coffee pressure accumulating spring (51) abuts against the stepped surface of the coffee brewing chamber (510), and the lower end abuts the bottom free end of the sealing body (53) against the coffee outlet plug (52), thereby sealing the coffee flow channel (520).

9. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 8, characterized in that: The sealing body (53) is a sealing ball structure.

10. The back-flushing and quick-dredging brewing head of a fully automatic coffee machine filter blockage as claimed in claim 1, characterized in that: A groove portion (20) is provided on the bottom surface of the brewing head base (2); the brewing head filter (3) is an arc-shaped structure; a fixing hole is provided at a circular portion of the brewing head filter (3); the brewing head filter (3) is fixed to the brewing head base (2) by screw connection; and a cavity is formed between the inner arc surface of the brewing head filter (3) and the groove portion (20).

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