Coffee machine three-way assembly integrated with pressure relief function and coffee machine adopting coffee machine three-way assembly

Abstract

The utility model discloses a coffee machine three-way assembly integrating pressure relief function and a coffee machine using the same, a three-way mounting bracket is used for mounting and connecting a three-way main body and mounting and connecting a coffee machine extraction box cover, the three-way main body is provided with a water inlet pipe cavity and a pressure relief pipe cavity, the water inlet pipe cavity is used for connecting an extraction water inlet pipe, and the pressure relief pipe cavity is used for connecting a pressure relief pipe. The pressure relief pipe cavity channel is used for being connected with the pressure relief output pipe and containing the pressure relief assembly. The front end face of the pressure relief plug is in contact plugging connection with a tail end opening of a water drainage channel in the pressure relief pipe cavity, the front end of the water drainage channel is communicated with a water inlet pipe cavity in the tee joint body, the pressure relief plug is embedded in the front end of the plug seat, and the tail end of the plug seat is in limiting connection with the front end of the spring. The tail end of the spring is in limiting connection with the pressure relief output pipe. After certain water pressure is achieved in the extraction box, high pressure in the extraction box can be effectively and automatically relieved and flows out, the effect of timely relieving pressure to protect related components or equipment of the coffee machine is achieved, and the structure is simple, safe and effective.

Description

Technical Field

[0001] The utility model relates to the technical field of a coffee machine or coffee extraction, in particular to a coffee machine three-way component with an integrated pressure relief function used in a coffee machine or coffee extraction, and a coffee machine using the component. Background Art

[0002] In the process of preparing coffee liquid, the extraction of coffee liquid is usually a preparation link in the coffee machine. The water source used for preparation needs to be pumped from the water tank to the boiler for heating, and then introduced into the extraction box for coffee liquid extraction preparation, so as to obtain a more delicate coffee liquid with a better taste. However, the existing coffee machine uses the method of directly leading the water source from the water tank to the boiler for heating, and then all the heated hot water from the boiler is introduced into the extraction box for coffee liquid extraction preparation. If it is not well controlled, it is easy to cause the water pressure in the extraction box to be too high, which is easy to damage and affect the service life of the relevant parts of the coffee machine, or cause the coffee machine to increase system safety hazards after long-term use.

[0003] The authorized patent No. ZL201621325957.4, which was announced on October 13, 2017, discloses a three-way pressure relief valve for a coffee machine, including a valve body and a valve cover, a pressure relief port piston is provided inside the valve cover, a pressure relief port connected to the outside is provided above the pressure relief port piston, a piston spring is provided at the bottom of the pressure relief port piston, a sealing silicone ring is provided on the inner wall of the valve cover, a valve cavity is provided inside the valve body, an NTC thermistor is also provided in the valve cavity, a water inlet and a water outlet are connected to the two sides of the valve cavity, a push rod is movably provided in the valve cavity, the top of the push rod is connected to the piston spring, the bottom of the push rod is connected to a cam, the cam is connected to a rotating motor, and the water outlet, the water inlet and the pressure relief port channels are connected respectively. Although this scheme has a certain pressure relief effect, it requires the use of a circuit program to control the motor to rotate the cam and drive the push rod to reciprocate up and down to achieve the pressure relief effect, and it also requires the coordination of many components such as the protection spring and the piston spring, and there are potential hidden dangers and defects such as complex pressure relief control structure, high control cost, and high failure rate. Utility Model Content

[0004] The utility model aims to solve the existing problems that the water pressure in the extraction box is easily high during the extraction and preparation process of coffee liquid, which is easy to damage and affect the service life of related parts of the coffee machine, or increase the safety hazard of the system after long-term use of the coffee machine. The utility model provides a coffee machine three-way component with integrated pressure relief function, which can automatically release the high pressure in the extraction box and flow out the water after a certain water pressure is reached in the extraction box, so as to timely relieve the pressure and protect the related parts or equipment of the coffee machine, and has a simple, safe and effective structure. The coffee machine using the component can also be provided.

[0005] The specific technical solution adopted by the utility model to solve the above technical problems is: a three-way component of a coffee machine with integrated pressure relief function, characterized in that: it comprises a three-way mounting bracket, a three-way main body, a water inlet pipe component and a pressure relief component, the three-way mounting bracket is used to be installed and connected with the three-way main body and installed and connected with the coffee machine extraction box cover, the three-way main body is provided with a water inlet pipe cavity and a pressure relief pipe cavity, the water inlet pipe cavity is used to connect the extraction water inlet pipe, and the pressure relief pipe cavity is used to connect the pressure relief output pipe and accommodate the pressure relief component; the pressure relief component comprises a pressure relief plug, a plug seat and a spring, the front end face of the pressure relief plug is in contact with and sealed with the end mouth of the water discharge channel in the pressure relief pipe cavity, the front end of the water discharge channel is communicated with the water inlet pipe cavity in the three-way main body, the front end of the plug seat is embedded with the pressure relief plug, the tail end of the plug seat is limitably connected to the front end of the spring, and the tail end of the spring is limitably connected to the pressure relief output pipe. Normal water supply is formed by sealing the end of the drain channel in the pressure relief pipe cavity with a pressure relief plug, or the end of the drain channel is opened to realize water pressure relief after a certain water pressure is reached. After a certain water pressure is reached in the extraction box, the high-pressure pressure in the extraction box is automatically relieved and flows out, thereby timely relieving pressure and protecting related parts or equipment of the coffee machine. The structure is simple, safe and effective.

[0006] Preferably, the three-way main body water inlet channel has a first water inlet channel and a second water inlet channel, the inner end of the first water inlet channel is connected to the water inlet end of the coffee machine extraction box cover, the outer end of the first water inlet channel is connected to the inner end of the second water inlet channel, the second water inlet channel is used to connect the water inlet pipe to the extraction water source, and the front end of the drainage channel is connected to the first water inlet channel. The access stability, reliability and effectiveness of the water inlet waterway are improved, and the drainage and pressure relief are simple, convenient, reliable and effective.

[0007] Preferably, the front end of the plug seat is provided with a positioning groove, the limiting groove is recessed from the front end of the plug seat toward the rear end of the plug seat, the limiting groove is used to connect and position the pressure relief plug, the outer circumference of the rear end of the plug seat is smaller than the outer circumference of the front end of the plug seat, forming the rear end of the plug seat with an annular step structure, the front end of the spring is sleeved on the annular step structure and is in contact with its annular step surface, so as to improve the pressure relief of the pressure relief component and the normal blocking of water inflow, which is simple, stable, reliable and effective.

[0008] Preferably, the plug seat is provided with a straight drainage channel inside the seat, which penetrates and connects the bottom surface of the positioning groove and the tail end surface of the plug seat. The straight drainage channel inside the seat not only reduces the overall weight of the plug seat, but also improves the reverse push of the water flow and the spring to block the end of the drainage channel. The straight drainage channel inside the seat is used to improve the upward movement of the plug seat after water and pressure relief, and the pressure relief plug is pushed to block the end of the drainage channel quickly, reliably and effectively.

[0009] Preferably, the pressure relief lumen has a first section, a second section and a third section connected in sequence, wherein the inner end of the first section is connected to the end of the drain, the second section and the third section are used to limit the connection and fix the pressure relief output pipe, the front end of the pressure relief output pipe is provided with a spring limit groove, the spring limit groove is used to limit the connection with the tail end of the spring, and the pressure relief assembly in the pressure relief lumen is improved to be flexible, simple, convenient, reliable and effective in the pressure relief and plugging process.

[0010] Preferably, the inner diameters of the first, second and third pressure relief lumen sections of the pressure relief lumen increase in sequence, and an annular limiting groove concave toward the outer wall of the lumen is provided at the connection between the front end of the third pressure relief lumen section and the second pressure relief lumen section, and the annular limiting groove has two or four through grooves extending outward and penetrating and connecting to the outer peripheral wall of the pressure relief lumen, and the annular limiting groove and the through groove are used for limiting connection with the limiting plug spring pin provided on the outer periphery of the pressure relief output pipe, so as to improve the flexibility, simplicity, convenience, reliability and effectiveness of the pressure relief push-out and plugging promotion of the pressure relief assembly in the pressure relief lumen section.

[0011] Preferably, the end of the drain channel has a tapered protrusion protruding into the pressure relief lumen, so that after the front end face of the pressure relief plug contacts and seals with the end face of the drain channel with the tapered protrusion, there is still a space between the front end face of the pressure relief plug and the inner end face of the pressure relief lumen. This improves the safety, reliability and effectiveness of the pressure relief plug in performing normal extraction water inlet sealing, and improves the speed, reliability and effectiveness of pressure relief when water and pressure relief are required.

[0012] Preferably, the pressure relief output pipe adopts a pressure relief elbow structure with a 90-degree bend, and two outer wall annular grooves are arranged on the outer peripheral wall of the elbow section where the pressure relief elbow is connected to the pressure relief pipe cavity, and the two outer wall annular grooves are concave from the outer peripheral wall surface of the elbow to the inner peripheral wall surface of the elbow, and the two outer wall annular grooves are respectively used to connect and set an O-ring and a limit card spring pin. The overall layout flexibility and effectiveness of the pressure relief transmission reflux of the pressure relief output pipe in the coffee machine are improved, and the pressure relief stability, reliability and effectiveness of the pressure relief output pipe during pressure relief are improved.

[0013] Preferably, the second water inlet pipe cavity is provided with a second annular limiting groove concave toward the outer wall of the cavity where it is located near the outer port, and the second annular limiting groove has two or four second through grooves extending outwardly through and connected to the outer peripheral wall of the second water inlet pipe cavity, and the second water inlet pipe cavity annular limiting groove and the second water inlet pipe cavity through groove are used for limiting connection with the second limiting clamp spring pin arranged on the outer periphery of the front end of the extraction water inlet pipe, and the outer periphery of the front end of the extraction water inlet pipe is sleeved with a second O-type sealing ring, and the second O-type sealing ring is arranged in front of the second limiting clamp spring pin, and the outer periphery of the front end of the extraction water inlet pipe between the second O-type sealing ring and the second limiting clamp spring pin has a radial annular outer protrusion annular protrusion isolation limiting step. Improve the installation connection between the extraction water inlet pipe and the second water inlet pipe cavity is simple, stable, reliable and effective.

[0014] Another invention object of the present invention application is to provide a coffee machine, including an extraction box, a boiler and a water tank for extraction water source, characterized in that: a coffee machine three-way assembly with an integrated pressure relief function as described in one of the above technical solutions is adopted, the coffee machine three-way assembly is connected and arranged at the top of the box cover of the extraction box, the inner end of the water inlet pipe cavity of the coffee machine three-way assembly is connected with the water inlet end of the extraction box cover, a three-way pipe is provided on the water outlet pipe of the water tank, a first pipe of the three-way pipe is connected with the water outlet pipe of the water tank, a second pipe of the three-way pipe is connected with the water inlet end pipe of the water pump, a water outlet end of the water pump is connected with the boiler water inlet pipe, the boiler water outlet pipe is connected with the extraction water inlet pipe, a pressure relief reflux pipe is connected to the tail end of the pressure relief output pipe connected to the coffee machine three-way assembly, and the tail end of the pressure relief reflux pipe is connected with the third pipe of the three-way pipe. Effectively protect the coffee machine extraction box. When it becomes clogged or other conditions cause the water pressure to reach a certain level, the pressure relief plug will be pushed open by the high-pressure water and compress the spring. The high-pressure water will flow out of the pressure relief output pipe and return to the water tank, thereby quickly protecting the equipment, pipelines and system safety.

[0015] The beneficial effects of the utility model are as follows: normal water supply is formed by blocking the end of the drain channel in the pressure relief pipe cavity by the pressure relief plug, or the water pressure relief after a certain water pressure is reached is realized by opening the end of the drain channel. After a certain water pressure is reached in the extraction box, the high-pressure pressure in the extraction box is automatically relieved and flows out, thereby timely relieving pressure and protecting the relevant parts or equipment of the coffee machine. The structure is simple, safe and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Figure 1 The utility model is a cross-sectional structural schematic diagram of a three-way component of a coffee machine with an integrated pressure relief function.

[0018] Figure 2 It is a schematic diagram of the exploded structure of a three-way component of a coffee machine with an integrated pressure relief function according to the utility model.

[0019] Figure 3 The utility model is a schematic diagram of the structure of the pressure relief use principle of a coffee machine with a three-way component having an integrated pressure relief function. DETAILED DESCRIPTION

[0020] Embodiment 1:

[0021] Figure 1 , Figure 2 , Figure 3 In the embodiment shown, a three-way assembly of a coffee machine with an integrated pressure relief function includes a three-way mounting bracket 01, a three-way main body 02, a water inlet pipe assembly and a pressure relief assembly. The three-way mounting bracket 01 is used to be installed and connected to the three-way main body 02 and to be connected to the coffee machine extraction box cover 81 (see Figure 3 ) installation and connection, a water inlet pipe cavity 10 and a pressure relief pipe cavity 20 are opened on the tee body 02, the water inlet pipe cavity 10 is used to connect the extraction water inlet pipe 03 in the water inlet pipe assembly, and the pressure relief pipe cavity 20 is used to connect the pressure relief output pipe 04 and the accommodating pressure relief assembly; the pressure relief assembly comprises a pressure relief plug 30, a plug seat 50 and a spring 40, the front end face of the pressure relief plug 30 is in contact and sealed with the end of the drain channel 25 in the pressure relief pipe cavity, the front end of the drain channel 25 is connected with the water inlet pipe cavity 10 in the tee body 02, the front end of the plug seat 50 is embedded with a limit pressure relief plug 30, the front end of the pressure relief plug 30 is exposed outside the notch of the positioning groove 51 of the plug seat 50, the tail end of the plug seat 50 is limit-connected to the front end of the spring 40, and the tail end of the spring is limit-connected to the pressure relief output pipe. The shape of the pressure relief plug 30 can be cylindrical, square or spherical, etc., which can contact and seal the end of the drain channel 25. The corresponding positioning groove 51 also adopts a groove shape structure that matches the outer shape of the pressure relief plug 30.

[0022] The three-way main body water inlet channel 10 has a first water inlet channel 11 and a second water inlet channel 12. The inner end of the first water inlet channel 11 is connected to the water inlet end of the coffee machine extraction box cover, and the outer end of the first water inlet channel 11 is connected to the inner end of the second water inlet channel 12. The second water inlet channel 12 is used to connect the water inlet pipe to the extraction water source, and the front end of the drain channel 25 is connected to the first water inlet channel 11. The inner diameter of the first water inlet channel 11 is smaller than the inner diameter of the second water inlet channel 12. The inner diameter of the drain channel 25 is smaller than the inner diameter of the first water inlet channel 11 and the inner diameter of the first section of the pressure relief channel 21.

[0023] The front end of the plug seat 50 is provided with a positioning groove 51, and the limiting groove 51 is recessed from the front end of the plug seat to the rear end of the plug seat. The limiting groove 51 is used to connect and position the pressure relief plug 30. The outer circumference of the rear end 52 of the plug seat is smaller than the outer circumference of the front end of the plug seat 50, forming the rear end 52 of the plug seat with an annular step structure. The front end of the spring 40 is sleeved on the annular step structure and connected with the annular step surface 54 (see Figure 2 ) are connected top to top.

[0024] A straight water drainage channel 53 is provided in the plug seat 50 , and the straight water drainage channel 53 penetrates and communicates with the bottom surface of the positioning groove 51 and the end surface of the plug seat tail end 52 .

[0025] The pressure relief pipe cavity 20 has a first section of pressure relief pipe cavity 21, a second section of pressure relief pipe cavity 22 and a third section of pressure relief pipe cavity 23 which are connected in sequence, wherein the inner end of the first section of pressure relief pipe cavity 21 is connected to the end of the water discharge channel 25, and the second section of pressure relief pipe cavity 22 and the third section of pressure relief pipe cavity 23 are used for limiting the connection and fixing the pressure relief output pipe 04, and the front end surface of the pressure relief output pipe 04 is provided with a spring limiting groove 043, and the spring limiting groove 043 is used for limiting the connection with the tail end of the spring 40. The inner diameters of the first section of the pressure relief lumen 21, the second section of the pressure relief lumen 22 and the third section of the pressure relief lumen 23 are increased in sequence. An annular limiting groove 24 concave toward the outer wall of the lumen is provided at the connection between the front end of the third section of the pressure relief lumen 23 and the second section of the pressure relief lumen 22. The annular limiting groove 24 has two or four through grooves 25 extending outwardly through and connected to the outer wall of the pressure relief lumen (see Figure 2 ), the annular limiting groove 24 and the through groove 25 are used for limiting the connection of the limiting plug spring pin 06 arranged on the outer periphery of the pressure relief output pipe 04. The end of the drain channel 51 has a tapered protrusion 26 protruding into the pressure relief pipe cavity, so that after the front end face of the pressure relief plug 30 contacts and seals the end face of the drain channel of the tapered protrusion 26, there is still a space distance between the front end face of the pressure relief plug 30 and the inner end face 211 of the pressure relief pipe cavity. The pressure relief output pipe 04 adopts a pressure relief elbow structure with a 90-degree bend. Two outer wall annular grooves are provided on the outer circumferential wall of the elbow section where the pressure relief elbow is connected to the pressure relief pipe cavity 20. The two outer wall annular grooves are concave from the outer circumferential wall surface of the elbow to the inner circumferential wall surface of the elbow. The two outer wall annular grooves are respectively used to connect and set the O-ring 07 and the limit card spring pin 06. Specifically, the first outer wall annular groove 041 of the two outer wall annular grooves is used to connect the set O-ring 07, and the second outer wall annular groove 042 of the two outer wall annular grooves is used to connect the card-mounted limit card spring pin 06. There is a section of the outer wall ring body of the pressure relief output pipe between the first outer wall annular groove 041 and the second outer wall annular groove 042.

[0026] The water inlet pipe assembly includes an extraction water inlet pipe 03 , two second O-rings 071 and a second limit-lock spring pin 061 . The second water inlet pipe cavity 12 is provided with a second annular limiting groove 121 concave toward the outer wall of the cavity where it is located near the outer port. The second annular limiting groove 121 has two or four second through grooves 122 extending outwardly and penetrating and connected to the outer peripheral wall of the second water inlet pipe cavity. The second water inlet pipe cavity annular limiting groove 121 and the second water inlet pipe cavity through groove 122 are used for limiting the connection with the second limiting clamp spring pin 061 arranged on the outer periphery of the front end of the extraction water inlet pipe. Two second O-rings 071 are set on the outer periphery of the front end of the extraction water inlet pipe. The two second O-rings 071 are adjacently set in front of the second limiting clamp spring pin 061. The outer periphery of the front end of the extraction water inlet pipe 03 between the second O-ring 071 and the second limiting clamp spring pin 061 has a radial annular outer protrusion annular protrusion isolation limit step 031.

[0027] The tee mounting bracket 01 is fixedly connected with two bracket mounting connection hole columns 012 and three tee body mounting connection hole columns 013, and the three tee body mounting connection holes 013 are distributed and arranged on the tee mounting bracket 01 so that the tee body 02 can be finally installed and fixedly connected to the tee mounting bracket 01, and the installation positions of the two bracket mounting connection hole columns 012 can be fully exposed, which effectively guarantees the convenient and flexible installation operation when the tee mounting bracket 01 is installed and used at the top of the box cover 81 of the extraction box 80, and there will be no obstacles in the installation operation position. A sealing ring installation groove 011 is provided in the three-way mounting bracket 01, and a three-way main body sealing ring 08 is installed in the sealing ring installation groove 011. The three-way main body sealing ring 08 improves the reliability and effectiveness of the sealing after the three-way main body 02 and the three-way mounting bracket 01 are fixedly connected together, and can effectively guide the water from the extraction water inlet pipe 03 to the inside of the box cover 81 of the extraction box 80 to enter the extraction box to participate in the extraction task of the coffee liquid. The three-way main body 02 is fastened and installed with the three three-way main body installation connection hole columns 013 of the three-way mounting bracket 01 through the main body installation hole columns 021 by three fastening screws 022, so as to achieve the installation, fastening and sealing connection between the three-way main body 02 and the three-way mounting bracket 01, and two bracket installation connection hole columns 012 are reserved to ensure the convenient installation connection between the three-way mounting bracket 01 and the top of the box cover 81 of the extraction box 80.

[0028] Embodiment 2:

[0029] Figure 1 , Figure 2 , Figure 3In the embodiment shown, a coffee machine includes an extraction box 80, a water pump 60, a boiler 70 and a water tank 50 for extraction water source, and adopts the coffee machine three-way assembly with integrated pressure relief function described in Example 1. The coffee machine three-way assembly is connected to the top of the box cover 81 of the extraction box 80, and the inner end of the water inlet pipe cavity 10 of the coffee machine three-way assembly is connected to the water inlet end of the box cover of the extraction box 80. A three-way pipe 52 is installed and connected to the water outlet pipe 51 of the water tank, and the first through pipe of the three-way pipe 52 is connected to the water outlet pipe 51 of the water tank. 1, the second through pipe of the three-way pipe 52 is connected to the water pump inlet end pipe 61, the water pump outlet end 62 is connected to the boiler inlet pipe 71, the boiler outlet pipe 72 is connected to the extraction water inlet pipe 03, and the tail end of the pressure relief output pipe 04 connected to the three-way assembly of the coffee machine is installed and connected with a pressure relief return pipe 05, the tail end of the pressure relief return pipe 05 is connected to the third through pipe of the three-way pipe 52, and the pressure relief return pipe 05 can adopt a pressure relief elbow structure to better meet its overall reasonable layout in the coffee machine. The rest is the same as in embodiment 1. The water tank 50 and the boiler 70 are respectively configured with their respective corresponding temperature sensors 08 (only using the same number, not actually the same different sensor entities themselves).

[0030] When in use, under normal use, the water in the water tank 50 enters the water pump 60 after passing through the water tank outlet pipe 51 and the first through pipe of the three-way pipe 52. The water pump is pumped into the boiler 70, and then led from the boiler to the extraction water inlet pipe 03 and enters the three-way assembly (see Figure 1 , Figure 3 The coffee liquid flows from the water inlet channel into the extraction box 80, and the extracted coffee liquid flows out from the coffee liquid outlet (see FIG. Figure 3 D arrow flow direction shown in the figure); if the extraction box 80 or the water outlet is blocked, the water pump 60 continues to pressurize. When a certain water pressure is reached, the pressure relief plug 30 in the pressure relief assembly will be pushed open by the high-pressure water at the end of the drain channel 51, and drive the plug seat 50 to compress the spring 40, and the high-pressure water enters the pressure relief pipe cavity from the end of the drain channel 51. The high-pressure water then flows out from the pressure relief output pipe of the pressure relief elbow, flows out and enters the pressure relief reflux pipe, and then enters the water tank outlet pipe 51 through the third pipe of the tee pipe 52 and returns to the water tank 50 in reverse, thereby playing a role in pressure relief protection equipment, pipelines and system safety.

[0031] The present invention is not limited to the above-mentioned specific embodiments, and may also have other structural embodiments. For example, according to the "three-way mounting bracket used to be installed and connected to the three-way main body and to be installed and connected to the coffee machine extraction box cover" recorded in this solution, the three-way mounting bracket obtained by changing the three-way mounting bracket component manufactured separately to be directly manufactured into an integrated structure with the coffee machine extraction box cover, thereby circumventing the technical solution of this patent application, all of which fall within the protection scope of the present invention.

[0032] In the description of positional relationships in the present invention, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The above content and structure describe the basic principle, main features and advantages of the utility model product, which should be understood by technicians in this industry. The above examples and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which are within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A three-way assembly of a coffee machine with integrated pressure relief function, characterized in that: It comprises a three-way mounting bracket, a three-way main body, a water inlet pipe assembly and a pressure relief assembly. The three-way mounting bracket is used to be installed and connected with the three-way main body and the coffee machine extraction box cover. The three-way main body is provided with a water inlet pipe cavity and a pressure relief pipe cavity. The water inlet pipe cavity is used to connect the extraction water inlet pipe, and the pressure relief pipe cavity is used to connect the pressure relief output pipe and accommodate the pressure relief assembly. The pressure relief assembly comprises a pressure relief plug, a plug seat and a spring. The front end face of the pressure relief plug is in contact with and sealed at the end of the water discharge channel in the pressure relief pipe cavity. The front end of the water discharge channel is communicated with the water inlet pipe cavity in the three-way main body. The front end of the plug seat is embedded with the pressure relief plug. The rear end of the plug seat is limitably connected to the front end of the spring. The rear end of the spring is limitably connected to the pressure relief output pipe.

2. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The water inlet pipe cavity of the three-way main body comprises a first water inlet pipe cavity and a second water inlet pipe cavity. The inner end of the first water inlet pipe cavity is connected to the water inlet end of the coffee machine extraction box cover, the outer end of the first water inlet pipe cavity is connected to the inner end of the second water inlet pipe cavity, the second water inlet pipe cavity is used to connect the water inlet pipe to the extraction water source, and the front end of the drain channel is connected to the first water inlet pipe cavity.

3. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: A positioning groove is provided at the front end of the plug seat, and the limiting groove is recessed from the front end of the plug seat toward the rear end of the plug seat. The limiting groove is used to connect and position the pressure relief plug. The outer circumference size of the rear end of the plug seat is smaller than the outer circumference size of the front end of the plug seat, forming the rear end of the plug seat with an annular step structure, and the front end of the spring is sleeved on the annular step structure and is in contact with its annular step surface.

4. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The plug seat is provided with an inner-seat water drainage straight channel, and the inner-seat water drainage straight channel penetrates and communicates with the bottom surface of the positioning groove and the tail end surface of the plug seat.

5. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The pressure relief pipe lumen comprises a first section, a second section and a third section which are connected in sequence, wherein the inner end of the first section is connected to the end of the drain channel, the second section and the third section are used for limiting the connection and fixing the pressure relief output pipe, and the front end surface of the pressure relief output pipe is provided with a spring limiting groove, which is used for limiting the connection with the tail end of the spring.

6. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 5, characterized in that: The inner circumference sizes of the first section of the pressure relief pipe lumen, the second section of the pressure relief pipe lumen and the third section of the pressure relief pipe lumen increase in sequence. An annular limiting groove concave toward the outer wall of the lumen is provided at the connection between the front end of the third section of the pressure relief pipe lumen and the second section of the pressure relief pipe lumen. The annular limiting groove has two or four through grooves extending outward and penetrating and connected to the outer peripheral wall of the pressure relief pipe lumen. The annular limiting groove and the through groove are used for limiting the connection of a limiting card spring pin arranged on the outer periphery of the pressure relief output pipe.

7. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The end of the drain channel has a tapered protrusion protruding into the pressure relief pipe cavity, forming a pressure relief plug. After the front end face of the pressure relief plug contacts and seals the end face of the drain channel with the tapered protrusion, there is still a space distance between the front end face of the pressure relief plug and the inner end face of the pressure relief pipe cavity.

8. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The pressure relief output pipe adopts a pressure relief elbow structure with a 90-degree bend. Two outer wall annular grooves are provided on the outer peripheral wall of the elbow section where the pressure relief elbow is connected to the pressure relief pipe cavity. Both outer wall annular grooves are concave from the outer peripheral wall surface of the elbow to the inner peripheral wall surface of the elbow. The two outer wall annular grooves are respectively used to connect and set an O-ring and a limit card spring pin.

9. The three-way assembly of a coffee machine with integrated pressure relief function according to claim 1, characterized in that: The second water inlet pipe cavity is provided with a second annular limiting groove concave toward the outer wall of the cavity where it is located near the outer port, and the second annular limiting groove has two or four second through grooves extending outward and penetrating and connected to the outer peripheral wall of the second water inlet pipe cavity. The second water inlet pipe cavity annular limiting groove and the second water inlet pipe cavity through groove are used for limiting the connection with a second limiting card spring pin arranged on the outer periphery of the front end of the extraction water inlet pipe, and a second O-ring is sleeved on the outer periphery of the front end of the extraction water inlet pipe, and the second O-ring is arranged in front of the second limiting card spring pin, and the outer periphery of the front end of the extraction water inlet pipe between the second O-ring and the second limiting card spring pin has a radial annular outer protrusion annular protrusion isolation limit step.

10. A coffee machine, comprising an extraction box, a boiler and a water tank for extraction water, characterized in that: A coffee machine three-way assembly with an integrated pressure relief function as claimed in any one of claims 1 to 9 is adopted, the coffee machine three-way assembly is connected to the top of the extraction box cover, the inner end of the water inlet pipe cavity of the coffee machine three-way assembly is connected to the water inlet end of the extraction box cover, a three-way pipe is provided on the water outlet pipe of the water tank, the first pipe of the three-way pipe is connected to the water outlet pipe of the water tank, the second pipe of the three-way pipe is connected to the water inlet end pipe of the water pump, the water outlet end of the water pump is connected to the boiler water inlet pipe, the boiler water outlet pipe is connected to the extraction water inlet pipe, the tail end of the pressure relief output pipe connected to the coffee machine three-way assembly is connected to a pressure relief reflux pipe, and the tail end of the pressure relief reflux pipe is connected to the third pipe of the three-way pipe.

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