Cold coffee extracting and brewing equipment

Abstract

The utility model relates to the technical field of coffee production equipment, in particular to a cold coffee extraction brewing device which comprises a base, a heat preservation coffee cold extraction tank is fixed on the base, an inner tank body is arranged in the heat preservation coffee cold extraction tank, a Miller plate is fixed on the outer wall of the inner tank body, a cooling cavity is formed between the Miller plate and the inner tank body, and the cooling cavity is communicated with the inner tank body. A heat preservation layer is filled between the Miller plate and the outer wall of the heat preservation coffee cold extraction tank, a brewing water spraying pipe is fixed to the top in the heat preservation coffee cold extraction tank, a feeding hopper, an operation manhole and a water inlet pipeline are arranged above the heat preservation coffee cold extraction tank, and the water inlet pipeline is communicated with the brewing water spraying pipe. The cold extraction tank has the beneficial effects that the Miller plate is arranged on the outer wall of the inner tank body of the cold extraction tank to form the cooling cavity, and the cold extraction tank is integrally cooled by a refrigerant, so that the constant temperature in the preparation process can be ensured; coffee liquid is repeatedly filtered through a filter screen and a secondary filter in the cold extraction tank, the purity of products can be guaranteed, and solid particle impurities are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee production equipment, in particular to cold coffee extraction and brewing equipment. Background Art

[0002] Cold brew coffee is extracted by ice water at low temperature, which is completely different from ordinary iced coffee. Cold brew coffee has a lower acidity and bitterness, and a mild sweetness. It takes a long time to extract coffee at low temperature, but this process can greatly reduce the acidity and bitterness, making the flavor sweeter and mellower. Cold brew coffee represents a new way and new experience of drinking coffee.

[0003] At present, the main methods of industrial coffee cold extraction in the industry are immersion and drip (including ice drip). Immersion cold extraction refers to pouring ground coffee powder into the extraction container and mixing it with cold water, leaving it to stand or stirring it intermittently for a period of time, and then separating the coffee grounds from the extract to extract the extract; drip cold extraction refers to pouring ground coffee powder into an extraction container with a filter at the bottom, injecting water on the surface of the coffee powder while filtering out the extract through the filter at the bottom; ice drip cold extraction refers to the water after the ice melts, dripping it drop by drop on the surface of the coffee powder, and extracting it slowly at low temperature.

[0004] Chinese patent application number 202210271765.3 discloses a cold brew coffee machine unit, including a bracket, a water supply pump is arranged on the bracket, one end of the water supply pump is connected to the extraction tank through a spray pipe, the other end of the water supply pump is connected to the external heat exchanger through the water supply pipe, the external heat exchanger and the extraction tank are arranged on the bracket, the bottom end of the extraction tank is connected to the liquid collecting pipe 2 through the liquid collecting pipe 1, the liquid collecting pipe 2 is connected to the liquid collecting tank, the liquid collecting tank is arranged on the bracket, the bottom end of the liquid collecting tank is provided with a liquid outlet, a CIP cleaning pipe 1 is arranged on the bracket, the CIP cleaning pipe 1 is connected to the liquid collecting tank through the CIP cleaning pipe 2, the CIP cleaning pipe 1 is connected to the liquid collecting pipe 2 through the CIP cleaning pipe 3, the CIP cleaning pipe 1 is connected to the CIP cleaning pipe 4, and the CIP cleaning pipe 4 is connected to the extraction tank through the extraction cleaning pipe. The above patent uses a water supply pump to atomize cold water and discharge it through a spray head to the extraction tank to soak the coffee powder. The CIP cleaning pipe group can clean the entire device, which is hygienic and convenient. However, when using coffee powder to make cold brew coffee, the coffee powder cannot be completely dissolved, and a large amount of solid residue will remain. The above patent cannot clean the residue in the coffee liquid, and uses cold water to directly mix with the coffee powder. During the preparation process, the temperature of the cold water will gradually rise, and it is impossible to achieve long-term low-temperature immersion extraction and the temperature cannot be controlled, which affects the final extraction effect and coffee taste. Utility Model Content

[0005] The utility model provides a cold coffee extraction and brewing device in order to solve the above problems.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A cold coffee extraction brewing device comprises a base, on which an insulated coffee cold extraction tank is fixed, an inner tank body is arranged inside the insulated coffee cold extraction tank, a Maitreya plate is fixed on the outer wall of the inner tank body, a cooling cavity is formed between the Maitreya plate and the inner tank body, an insulation layer is filled between the Maitreya plate and the outer wall of the insulated coffee cold extraction tank, a brewing water spray pipe is fixed on the top of the insulated coffee cold extraction tank, a feeding hopper, an operating manhole and a water inlet pipeline are arranged above the insulated coffee cold extraction tank, the water inlet pipeline is connected with the brewing water spray pipe, a set of stirring devices fixed to the top of the insulated coffee cold extraction tank is arranged inside the inner tank body, a slag discharge manhole connected to the inner cavity of the inner tank body is formed on the side wall of the insulated coffee cold extraction tank, and the position of the lower end of the inner tank body close to the slag discharge manhole A filter screen is fixed on the bottom of the insulated coffee cold brew tank, a CIP cleaning pipe connected to an external cleaning liquid is arranged at the bottom of the inner tank body, a one-way flow CIP cleaning ball connected to the CIP cleaning pipe is fixed at the bottom of the inner tank body, an insulated coffee liquid outlet pipe connected to the inner tank body cavity is fixed at the bottom of the insulated coffee cold brew tank, the other end of the insulated coffee liquid outlet pipe is connected to the liquid inlet end of the centrifugal pump, a glass buffer tank is connected in a bypass manner between the insulated coffee liquid outlet pipe and the pipeline connected to the centrifugal pump, a cold brew coffee discharge pipe and a circulation reflux pipeline are connected in parallel at the liquid outlet end of the centrifugal pump, one end of the circulation reflux pipeline away from the centrifugal pump is connected to the top of the inner tank body, one end of the cold brew coffee discharge pipe away from the centrifugal pump is connected to a secondary filter, and a liquid outlet pipe is arranged at the bottom of the secondary filter.

[0008] Furthermore, a workbench is provided on the base, the workbench is fixed close to the insulated coffee cold brew tank, a ladder is fixed on one side of the workbench, and an electric control box connected to the stirring device and the centrifugal pump wires is fixed on the workbench.

[0009] Furthermore, a movable frame is arranged below the secondary filter, and the middle part of the secondary filter is fixed to the movable frame via a rotating seat.

[0010] Furthermore, a slag discharge slope is fixed on the outer wall of the thermal coffee cold brew tank at a position corresponding to the slag discharge manhole.

[0011] Furthermore, the stirring device includes a stirring shaft, a slag discharge push plate and a stirring paddle are fixed to the lower end of the stirring shaft, the slag discharge push plate and the stirring paddle are arranged above the filter screen, and a reducer is fixed to the upper end of the stirring shaft, and the reducer is transmission-connected to a stirring motor connected to the electrical wires of the electrical control box.

[0012] Furthermore, the feed hopper is connected to the water inlet pipeline through a material-water mixer, the material-water mixer is connected in parallel to the brewing water spray pipe, and control valves connected to the electric wires of the electric control box are fixed on the branch pipes connecting the material-water mixer, the brewing water spray pipe and the water inlet pipeline.

[0013] Furthermore, a sight light connected to the electric wires of the electric control box is fixed on the top of the inner tank body, a temperature sensor connected to the electric wires of the electric control box is fixed on the side wall of the insulated coffee cold brew tank, a refrigerant discharge pipe and a refrigerant inlet pipe connected to the cooling chamber are fixed on the side wall of the insulated coffee cold brew tank, and a liquid level meter is fixed to the bottom of the insulated coffee cold brew tank.

[0014] Furthermore, an operation manhole, a pressure gauge, and a sight glass are provided on the top cover of the secondary filter, and a filter bag is provided inside the secondary filter, and a liquid inlet end of the filter bag is connected to the cold brew coffee discharge pipe.

[0015] Furthermore, a one-way CIP cleaning ball and a breathing hole connected to the CIP cleaning pipe are provided on the top of the glass buffer tank.

[0016] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: a cooling chamber is formed by arranging a Maitreya plate on the outer wall of the inner tank body of the cold extraction tank, and a refrigerant is used to cool the cold extraction tank as a whole, thereby ensuring a constant temperature during the preparation process and ensuring the taste; the coffee liquid is repeatedly filtered by using a filter screen and a secondary filter in the cold extraction tank, thereby ensuring the purity of the product and reducing solid particle impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is the first stereogram of the utility model;

[0019] Figure 2 It is a second stereogram of the utility model;

[0020] Figure 3 It is the front view of the utility model;

[0021] Figure 4 It is a top view of the utility model;

[0022] Figure 5 It is a side view of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of the insulated coffee cold brew tank of the utility model;

[0024] Figure 7 It is a circuit structure block diagram of the utility model.

[0025] The following are the descriptions of the reference numerals:

[0026] 1. Insulated coffee cold brew tank; 101. Stirring device; 102. Feed hopper; 103. Operation manhole; 104. Slag discharge manhole; 105. Slag discharge slope; 106. Inner tank body; 107. Maitreya board; 108. Insulation layer; 109. Brewing water spray pipe; 110. Sight light; 2. Workbench; 3. Electric control box; 4. Secondary filter; 5. Centrifugal pump; 6. Glass buffer tank; 7. Water inlet pipeline; 8. Insulated coffee outlet pipe; 9. Base; 10. Ladder; 11. CIP cleaning pipe; 12. Cold brew coffee discharge pipe; 13. Circulation reflux pipeline; 14. Movable rack. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-Figure 7As shown, a cold coffee extraction brewing device comprises a base 9, on which an insulated coffee cold extraction tank 1 is fixed, an inner tank body 106 is arranged inside the insulated coffee cold extraction tank 1, a Maitreya plate 107 is fixed on the outer wall of the inner tank body 106, a cooling cavity is formed between the Maitreya plate 107 and the inner tank body 106, and a low-temperature cooling medium circulates in the cooling cavity to cool the inner tank body 106 as a whole, so as to ensure that the coffee powder is cold extracted at a low temperature. Because of the long-term low-temperature immersion and the micro-fermentation, the coffee powder has a mellow taste and a good mellow taste, and even has a fermented aroma. An insulation layer 108 is filled between the Maitreya plate 107 and the outer wall of the insulated coffee cold extraction tank 1 to reduce temperature loss, and a brewing water spray pipe is fixed on the top of the insulated coffee cold extraction tank 1. 109, a feed hopper 102, an operation manhole 103 and a water inlet pipe 7 are arranged above the insulated coffee cold brew tank 1, a flow meter for measuring water is fixed on the water inlet pipe 7, the water inlet pipe 7 is connected with the brewing water spray pipe 109, a stirring device 101 fixed on the top of the insulated coffee cold brew tank 1 is arranged inside the inner tank body 106, the stirring device 101 can make the coffee powder and the brewing water fully mixed and dissolved, and the slag can be conveniently discharged, a slag discharge manhole 104 connected to the inner cavity of the inner tank body 106 is formed on the side wall of the insulated coffee cold brew tank 1, and a filter screen is fixed at the lower end of the inner tank body 106 near the slag discharge manhole 104. During the preparation process, the undissolved coffee powder is left above the filter screen, which is convenient for removal. The slag discharge manhole 104 is cleaned out, a CIP cleaning pipe 11 connected to the external cleaning liquid is arranged at the bottom of the insulated coffee cold brew tank 1, a one-way flow CIP cleaning ball connected to the CIP cleaning pipe 11 is fixed at the bottom of the inner tank body 106, and the CIP cleaning ball is located below the filter screen, which is convenient for cleaning the inside of the equipment after use, and an insulated coffee liquid outlet pipe 8 connected to the inner cavity of the inner tank body 106 is fixed at the bottom of the insulated coffee cold brew tank 1, and the other end of the insulated coffee liquid outlet pipe 8 is connected to the liquid inlet end of the centrifugal pump 5, and a control valve is fixed on the insulated coffee liquid outlet pipe 8, and a glass buffer tank 6 is bypassed and connected between the pipelines connecting the insulated coffee liquid outlet pipe 8 and the centrifugal pump 5, and control valves are fixed on the inlet and outlet ends of the glass buffer tank 6. By using transparent glass, the color and purity of the filtered coffee can be seen, which is ornamental. The glass buffer tank 6 can prevent negative pressure from being generated at the bottom of the filter screen of the insulated coffee cold brew tank 1, thereby protecting the filter screen. The liquid outlet of the centrifugal pump 5 is connected in parallel with a cold brew coffee discharge pipe 12 and a circulation return line 13. The end of the circulation return line 13 away from the centrifugal pump 5 is connected to the top of the inner tank body 106. Control valves are fixed on the cold brew coffee discharge pipe 12 and the circulation return line 13 to facilitate controlling the flow direction of the liquid. The end of the cold brew coffee discharge pipe 12 away from the centrifugal pump 5 is connected to a secondary filter 4. A liquid outlet pipe with a control valve is provided at the bottom of the secondary filter 4. The secondary filter 4 can perform secondary filtration on the coffee liquid to improve its purity.

[0029] In this embodiment, a workbench 2 is provided on the base 9, and the workbench 2 is fixed close to the insulated coffee cold brew tank 1. A ladder 10 is fixed on one side of the workbench 2. An electric control box 3 connected to the stirring device 101 and the centrifugal pump 5 with electric wires is fixed on the workbench 2. When working, the staff stands on the workbench 2 to perform the work, which is convenient for adding coffee powder and controlling the extraction process.

[0030] In this embodiment, a movable frame 14 is provided below the secondary filter 4, and the middle part of the secondary filter 4 is fixed to the movable frame 14 through a rotating seat, so that the secondary filter 4 can be tilted. The position of the secondary filter 4 can be easily moved through the movable frame 14, which is convenient for filling the prepared coffee liquid into the corresponding coffee refrigeration tank / barrel.

[0031] In the present embodiment, a slag discharge slope 105 is fixed on the outer wall of the insulated coffee cold brew tank 1 at a position corresponding to the slag discharge manhole 104. When the slag discharge operation is performed, the slag discharge manhole 104 is opened, and the residue on the filter screen can be pushed out from the slag discharge manhole 104 through the stirring device 101, and the coffee residue can automatically slide along the slag discharge slope 105 into the corresponding turnover box.

[0032] In this embodiment, the stirring device 101 includes a stirring shaft, a slag discharge push plate and a stirring paddle are fixed to the lower end of the stirring shaft, the slag discharge push plate and the stirring paddle are arranged above the filter screen, a reducer is fixed to the upper end of the stirring shaft, and the reducer is transmission-connected to a stirring motor connected to the electric control box 3 with electric wires. The high-speed forward rotation of the stirring shaft can drive the stirring paddle to promote the full mixing of brewing water and coffee powder, and the low-speed reverse rotation of the stirring shaft can use the slag discharge push plate to push the coffee grounds to the slag discharge manhole 104 for slag discharge.

[0033] In this embodiment, the feed hopper 102 is connected to the water inlet pipeline 7 through the material-water mixer, and the material-water mixer is connected in parallel with the brewing water spray pipe 109. Control valves connected to the electric wires of the electrical control box 3 are fixed on the branch pipes connecting the material-water mixer, the brewing water spray pipe 109 and the water inlet pipeline 7. Brewing water can be added separately, or coffee powder can be flushed into the inner tank body 106 using brewing water.

[0034] In the present embodiment, a sight light 110 connected to the electric wires of the electric control box 3 is fixed on the top of the inner tank body 106 to facilitate lighting inside the tank, a temperature sensor connected to the electric wires of the electric control box 3 is fixed on the side wall of the insulated coffee cold brew tank 1 to facilitate monitoring the temperature inside the insulated coffee cold brew tank 1, a refrigerant discharge pipe and a refrigerant inlet pipe connected to the cooling chamber are fixed on the side wall of the insulated coffee cold brew tank 1 to facilitate connection to the refrigerant circulation system, and a liquid level gauge is fixed to the bottom of the insulated coffee cold brew tank 1 to facilitate observation of the liquid level height inside the tank body.

[0035] In this embodiment, an operation manhole, a pressure gauge, and a sight glass are provided on the top cover of the secondary filter 4. A filter bag is provided inside the secondary filter 4. The liquid inlet end of the filter bag is connected to the cold brew coffee discharge pipe 12, and the filter bag is used to complete the secondary filtration of the coffee liquid.

[0036] In this embodiment, a one-way CIP cleaning ball and a breathing hole connected to the CIP cleaning pipe 11 are provided on the top of the glass buffer tank 6 to facilitate internal cleaning and ensure hygiene.

[0037] The working principle of the utility model is:

[0038] A. Brewing water enters the insulated coffee cold brew tank 1 through the water inlet pipe 7. When the brewing water level exceeds the built-in filter screen, the stirring device 101 is turned on, and the coffee powder is connected to the brewing water through the feed hopper 102 and the material-water mixer and enters the insulated coffee cold brew tank 1 at the same time. The coffee powder is injected and the brewing water is injected and the stirring device 101 is operated;

[0039] B. According to the process requirements, after the feeding is completed, the extraction temperature is set on the electric control box 3, and the automatic control valve is opened to allow the refrigerant to enter the cooling cavity of the Maitreya plate 107 to cool the tank until the temperature drops to the extraction temperature and then the temperature is kept constant to maintain the extraction temperature;

[0040] C. According to the process requirements, the centrifugal pump 5 is turned on, and the coffee liquid flows from the insulated coffee liquid outlet pipe 8 into the glass buffer tank 6. Under the action of the centrifugal pump 5, the coffee liquid is transported to the circulation return pipe 13 and then flows into the top of the insulated coffee cold brew tank 1, thus forming a cycle. According to the process requirements, this cycle is continued for a period of time, and the purpose of this is to soak and dissolve the flavor substances of the coffee powder as much as possible;

[0041] D. After the above steps are completed, the extraction process can be completed according to the process requirements, the automatic valve on the circulation reflux pipeline 13 is controlled to be closed, and the automatic valve on the cold brew coffee discharge pipe 12 is opened, and the coffee liquid is discharged from the glass buffer tank 6 and transported to the secondary filter 4 through the cold brew coffee discharge pipe 12. After the secondary filtration, the coffee liquid enters the coffee refrigeration tank or barrel for low-temperature preservation and storage;

[0042] E. After brewing is finished, open the slag discharge manhole 104 for slag discharge and cleaning, open the valve on the CIP cleaning pipe 11 and use the CIP cleaning system to flush the tank and pipeline.

[0043] The circuit connection involved in the utility model is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and it belongs to the widely used existing technology.

[0044] Components not described in detail herein are prior art.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold coffee extraction brewing device, comprising a base (9), a heat preservation coffee cold extraction tank (1) being fixed on the base (9), an inner tank body (106) being arranged inside the heat preservation coffee cold extraction tank (1), characterized in that: A Maitreya plate (107) is fixed on the outer wall of the inner tank body (106), a cooling cavity is formed between the Maitreya plate (107) and the inner tank body (106), an insulation layer (108) is filled between the Maitreya plate (107) and the outer wall of the insulated coffee cold extraction tank (1), a brewing water spray pipe (109) is fixed on the top of the insulated coffee cold extraction tank (1), and a feed hopper (102), an operation manhole (103) and a water inlet pipe are arranged above the insulated coffee cold extraction tank (1). The inner tank body (106) is provided with a stirring device (101) fixed to the top of the insulated coffee cold brew tank (1), and a slag discharge manhole (104) connected to the inner cavity of the inner tank body (106) is formed on the side wall of the insulated coffee cold brew tank (1), and a filtering screen is fixed at a position near the slag discharge manhole (104) at the lower end of the inner tank body (106), and the insulated coffee cold brew tank (1) is provided with a stirring device (101) fixed to the top of the insulated coffee cold brew tank (1), and a slag discharge manhole (104) connected to the inner cavity of the inner tank body (106) is formed on the side wall of the insulated coffee cold brew tank (1), and a filtering screen is fixed at a position near the slag discharge manhole (104) inside the lower end of the inner tank body (106), and the insulated coffee cold brew tank (1) is provided with a stirring device (101) fixed to the top of the insulated coffee cold brew tank (1), and the insulated coffee cold brew tank (1) is provided with a stirring device (101) fixed to the top of the insulated coffee cold brew tank (1), and the insulated coffee cold brew tank (1) is provided with a stirring device (101) fixed to the top of the insulated coffee cold brew tank (1), and the stirring device (10 ... The bottom of the cold coffee brewing tank (1) is provided with a CIP cleaning pipe (11) connected to an external cleaning liquid, the bottom of the inner tank body (106) is fixed with a one-way flow CIP cleaning ball connected to the CIP cleaning pipe (11), the bottom of the cold coffee brewing tank (1) is fixed with a cold coffee outlet pipe (8) connected to the inner cavity of the inner tank body (106), the other end of the cold coffee outlet pipe (8) is connected to the liquid inlet end of the centrifugal pump (5), and the cold coffee outlet pipe (8) is connected to the centrifugal pump (5). A glass buffer tank (6) is connected in bypass between the pipelines connected to the pump (5); the liquid outlet end of the centrifugal pump (5) is connected in parallel with a cold-brewed coffee discharge pipe (12) and a circulation return pipe (13); the end of the circulation return pipe (13) away from the centrifugal pump (5) is connected to the top of the inner tank body (106); the end of the cold-brewed coffee discharge pipe (12) away from the centrifugal pump (5) is connected to a secondary filter (4); and a liquid outlet pipe is provided at the bottom of the secondary filter (4).

2. A cold coffee extraction brewing device according to claim 1, characterized in that: A workbench (2) is provided on the base (9), the workbench (2) is fixed close to the insulated coffee cold brew tank (1), a ladder (10) is fixed on one side of the workbench (2), and an electric control box (3) connected to the stirring device (101) and the centrifugal pump (5) by electric wires is fixed on the workbench (2).

3. The cold coffee extraction brewing device according to claim 1, characterized in that: A movable frame (14) is arranged below the secondary filter (4), and the middle part of the secondary filter (4) is fixed to the movable frame (14) via a rotating seat.

4. The cold coffee extraction brewing device according to claim 1, characterized in that: A slag discharge slope (105) is fixed on the outer wall of the heat-insulating coffee cold brew tank (1) at a position corresponding to the slag discharge manhole (104).

5. The cold coffee extraction brewing device according to claim 2, characterized in that: The stirring device (101) comprises a stirring shaft, a slag discharge push plate and a stirring paddle are fixed at the lower end of the stirring shaft, the slag discharge push plate and the stirring paddle are arranged above the filter screen, and a reducer is fixed at the upper end of the stirring shaft, and the reducer is transmission-connected to a stirring motor connected to the electric control box (3) with electric wires.

6. The cold coffee extraction brewing device according to claim 2, characterized in that: The feed hopper (102) is connected to the water inlet pipeline (7) via a material-water mixer, and the material-water mixer is connected in parallel to the brewing water spray pipe (109). Control valves connected to the electric wires of the electric control box (3) are fixed on the branch pipes connecting the material-water mixer, the brewing water spray pipe (109) and the water inlet pipeline (7).

7. The cold coffee extraction brewing device according to claim 2, characterized in that: A sight light (110) connected to the electric wires of the electric control box (3) is fixed to the top of the inner tank body (106); a temperature sensor connected to the electric wires of the electric control box (3) is fixed to the side wall of the insulated coffee cold brew tank (1); a refrigerant discharge pipe and a refrigerant inlet pipe connected to the cooling chamber are fixed to the side wall of the insulated coffee cold brew tank (1); and a liquid level meter is fixed to the bottom of the insulated coffee cold brew tank (1).

8. The cold coffee extraction brewing device according to claim 1, characterized in that: The top cover of the secondary filter (4) is provided with an operation manhole, a pressure gauge, and a sight glass. A filter bag is provided inside the secondary filter (4), and the liquid inlet end of the filter bag is connected to the cold brew coffee discharge pipe (12).

9. The cold coffee extraction brewing device according to claim 1, characterized in that: The top of the glass buffer tank (6) is provided with a one-way flow CIP cleaning ball and a breathing hole which are connected to the CIP cleaning pipe (11).

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