Pressure relief device for coffee machine and coffee machine

Abstract

The utility model discloses a pressure relief device for a coffee machine and the coffee machine, relates to the technical field of coffee machines, and solves the problems that blockage is easy to occur when a common electromagnetic valve is adopted and the cost is high when a special electromagnetic valve is adopted. The pressure relief device comprises a pressure relief shaft, a sealing chamber and a pressure relief chamber; the sealing chamber and the pressure relief chamber are sequentially connected, one end of the pressure relief shaft extends to the outside of the side, away from the pressure relief chamber, of the sealing chamber, and the other end of the pressure relief shaft moves between the sealing chamber and the pressure relief chamber in the axial direction of the pressure relief shaft so as to connect or disconnect the sealing chamber and the pressure relief chamber; the sealing cavity is connected with a water inlet channel and a water outlet channel, and the pressure relief cavity is connected with a pressure relief channel. The device is simple in structure, stable in operation, not prone to blockage and low in maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee machines. Background Art

[0002] In the field of beverage machines, especially coffee machines, after the brewer finishes making coffee, on the one hand, the residual coffee water and coffee grounds mixed in the residual coffee water in the coffee brewing chamber of the brewer need to be emptied out so as not to affect the quality of the next cup of coffee. On the other hand, when the brewer finishes making coffee, its coffee brewing chamber is in a nearly vacuum state, and the brewing head or the top-dregs rod of the brewer is difficult to pull out. The coffee brewing chamber of the brewer needs to be connected to atmospheric pressure to achieve easy movement of the brewing head or the top-dregs rod.

[0003] At present, most coffee machines use solenoid valves to achieve pressure relief in the coffee brewing chamber of the brewer and pipeline switching for the coffee making function, but they all face two major problems: when ordinary solenoid valves are used for pressure relief, the pressure relief pipeline is easily blocked by coffee grounds mixed in the residual coffee water in the coffee brewing chamber of the brewer; when special solenoid valves are used, the cost is too high. Utility Model Content

[0004] Therefore, in order to solve the above-mentioned problem, the utility model provides a pressure relief device for a coffee machine and a coffee machine.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A pressure relief device for a coffee machine comprises a pressure relief shaft, a sealing chamber and a pressure relief chamber; the sealing chamber and the pressure relief chamber are connected in sequence, one end of the pressure relief shaft extends to the outside of the sealing chamber away from the pressure relief chamber, and the other end moves along its axial direction between the sealing chamber and the pressure relief chamber to connect or disconnect the sealing chamber and the pressure relief chamber; the sealing chamber is connected with a water inlet channel and a water outlet channel, and the pressure relief chamber is connected with a pressure relief channel.

[0007] Optionally, an elastic first sealing ring is provided at the connection between the sealing chamber and the pressure relief chamber, and the pressure relief shaft is provided with a pressure relief section and a sealing section in sequence along the sealing chamber toward the pressure relief chamber, the diameter of the pressure relief section is smaller than the inner diameter of the first sealing ring, and the diameter of the sealing section is larger than the inner diameter of the first sealing ring and smaller than the inner diameter of the pressure relief chamber; when the pressure relief section is passed through the first sealing ring, the sealing chamber is connected with the pressure relief chamber; when the sealing section is passed through the first sealing ring, the sealing chamber is disconnected from the pressure relief chamber.

[0008] Optionally, the cross section of the first sealing ring is V-shaped, and the concave side of the first sealing ring faces the middle of the sealing chamber.

[0009] Optionally, a guide sleeve is provided on the inner wall of one end of the sealing chamber away from the pressure relief chamber, and the pressure relief shaft is movably inserted into the guide sleeve.

[0010] Optionally, a second elastic sealing ring is provided on one side of the guide sleeve facing the middle of the sealing chamber, and the outer wall of the pressure relief shaft is always pressed against the inner wall of the second sealing ring.

[0011] Optionally, the cross section of the second sealing ring is V-shaped, and the concave side of the second sealing ring faces the middle of the sealing chamber.

[0012] Optionally, the pressure relief device further includes a reset member, and the reset member is used to apply a force to the pressure relief shaft away from the pressure relief chamber.

[0013] Optionally, the reset member includes a reset spring, and the reset spring is sleeved on a portion of the pressure relief shaft extending outside the sealing chamber.

[0014] Optionally, an abutment joint is provided at one end of the pressure relief shaft away from the pressure relief chamber, and one end of the reset member abuts against the abutment joint.

[0015] A coffee machine comprises the above-mentioned pressure relief device.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] 1. The sealing chamber and the pressure relief chamber are connected or disconnected by moving the pressure relief shaft along its axial direction; it has a simple structure, stable and convenient operation, the pipeline is not easy to be blocked during pressure relief, it has strong stability in use and low maintenance cost;

[0018] 2. Both the first sealing ring and the second sealing ring adopt a V-shaped cross-section structure, so that when the sealing chamber is filled with liquid, the two sides of the sealing ring can be pressed against the inner wall of the sealing chamber and the pressure relief shaft under the action of the internal pressure to improve the sealing performance;

[0019] 3. By using the plug-in fixation of the guide sleeve and the sealing chamber, it is convenient to insert one end of the pressure relief shaft into the sealing chamber, which is more convenient during assembly, and the guide sleeve can provide a guiding function when the pressure relief shaft moves axially;

[0020] 4. The reset member adopts a reset spring to provide a force for the pressure relief shaft to move away from the pressure relief chamber, and the structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the pressure relief device in this embodiment;

[0022] Figure 2 is a structural diagram of the pressure relief device from another perspective in this embodiment;

[0023] Figure 3 Schematic diagram of the sealing chamber, the pressure relief chamber, the pressure relief shaft and the return spring in this embodiment;

[0024] Figure 4 is a cross-sectional view of the sealed chamber and the pressure relief chamber when they are disconnected from each other in this embodiment;

[0025] Figure 5 It is a cross-sectional view of the sealed chamber and the pressure relief chamber in this embodiment when they are connected.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. pressure relief shaft; 2. return spring; 3. sealing chamber; 4. pressure relief chamber; 5. mounting shell; 6. water inlet channel; 7. water outlet channel; 8. pressure relief channel; 9. first sealing ring; 10. pressure relief section; 11. sealing section; 12. first step groove; 13. guide sleeve; 14. second step groove; 15. second sealing ring; 16. abutment; 17. annular groove; 18. third sealing ring. DETAILED DESCRIPTION

[0027] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] Now combined with the attached Figure 1-5 The utility model is further described with specific implementation modes.

[0029] A pressure relief device for a coffee machine, comprising a pressure relief shaft 1, a reset member, a sealed chamber 3, a pressure relief chamber 4 and a mounting shell 5. The pressure relief shaft 1, the reset member, the sealed chamber 3 and the pressure relief chamber 4 are all assembled in the mounting shell 5. The sealed chamber 3 and the pressure relief chamber 4 are connected in sequence. One end of the pressure relief shaft 1 extends to the outside of the sealed chamber 3 away from the pressure relief chamber 4, and the other end moves between the sealed chamber 3 and the pressure relief chamber 4 to connect or disconnect the sealed chamber 3 and the pressure relief chamber 4. The sealed chamber 3 is connected to a water inlet channel 6 and a water outlet channel 7, the water inlet channel 6 is connected to the water pump of the coffee machine, and the water outlet channel 7 is connected to the brewing chamber in the coffee machine. The pressure relief chamber 4 is connected to a pressure relief channel 8.

[0030] The reset member adopts a reset spring 2. The reset spring 2 is sleeved on the portion of the pressure relief shaft 1 located outside the sealed chamber 3, one end of which abuts against the outer wall of the sealed chamber 3, and the other end abuts against the end of the pressure relief shaft 1, so as to apply a force to the pressure relief shaft 1 away from the pressure relief chamber 4. Cooperating with the driving device in the coffee machine, the driving device drives the pressure relief shaft 1 to move along its axial direction. After the driving device unloads the force, the reset spring 2 drives the pressure relief shaft 1 to reset. The driving device in the coffee machine is a prior art, that is, the telescopic rod can be driven to move by a stepping motor, and then the pressure relief shaft can be driven to move, which will not be described here. In other embodiments, the reset spring 2 can also be replaced by other mechanical structures such as gas springs.

[0031] A first sealing ring 9 is provided at the connection between the sealing chamber 3 and the pressure relief chamber 4, and the first sealing ring 9 is made of elastic material. A pressure relief section 10 and a sealing section 11 are provided on the pressure relief shaft 1 in sequence from the sealing chamber 3 toward the pressure relief chamber 4, the diameter of the pressure relief section 10 is smaller than the inner diameter of the first sealing ring 9, and the diameter of the sealing section 11 is larger than the inner diameter of the first sealing ring 9 and smaller than the inner diameter of the pressure relief chamber 4.

[0032] Reference Figure 4 During operation, after the driving device in the coffee machine releases the force on the pressure relief shaft 1, the return spring 2 applies a force to the pressure relief shaft 1 away from the pressure relief chamber 4, so that the pressure relief shaft 1 moves away from the pressure relief chamber 4, so that the sealing section 11 moves to the first sealing ring 9, and the pressure relief section 10 is completely located in the sealing chamber 3, thereby disconnecting the pressure relief chamber 4 from the sealing chamber 3. At this time, water flows into the water inlet channel 6, passes through the sealing chamber 3, and flows out from the water outlet channel 7 to the brewing chamber in the coffee machine.

[0033] Reference Figure 5 , the driving device in the coffee machine drives the pressure relief shaft 1 to move axially, so that the pressure relief section 10 of the pressure relief shaft 1 passes through the first sealing ring 9, and the sealing section 11 is located in the pressure relief chamber 4. At this time, the sealed chamber 3 is connected with the pressure relief chamber 4, and the brewing chamber in the coffee machine is connected with the atmospheric pressure through the pressure relief channel 8, and the brewing chamber is depressurized. At this time, the water pump connected to the water inlet channel 6 in the coffee machine is turned off, and the residual coffee water and coffee grounds in the brewing chamber of the coffee machine flow from the water outlet channel 7 into the sealed chamber 3, and then into the pressure relief chamber 4, and flow out from the pressure relief channel 8.

[0034] Specifically, one end of the pressure relief chamber 4 is inserted into the sealing chamber 3. An annular first stepped groove 12 is provided on the inner wall of the sealing chamber 3, and one end of the first sealing ring 9 along its axial direction abuts against the groove wall of the first stepped groove 12, and the other end abuts against the end side wall of the pressure relief chamber 4. The cross section of the first sealing ring 9 is a V-shaped structure, and the concave side of the first sealing ring 9 faces the middle of the sealing chamber 3. By utilizing the V-shaped cross section of the first sealing ring 9, when the sealing chamber 3 is filled with liquid, the V-shaped sides of the first sealing ring 9 can be pressed against the inner wall of the sealing chamber 3 and the outer wall of the pressure relief shaft 1, respectively, to improve the sealing performance.

[0035] A guide sleeve 13 is inserted and fixed to the inner wall of one end of the sealing chamber 3 away from the pressure relief chamber 4, and the pressure relief shaft 1 is movably inserted into the guide sleeve 13. Through the insertion and assembly of the guide sleeve 13 and the sealing chamber 3, it is convenient to install the pressure relief shaft 1 into the sealing chamber 3; at the same time, when the pressure relief shaft 1 moves along its axial direction, the guide sleeve 13 can provide a guiding effect for the pressure relief shaft 1.

[0036] A second sealing ring 15 is installed on the side of the guide sleeve 13 facing the middle of the sealing chamber 3, and an annular second stepped groove 14 is provided on the inner wall of the sealing chamber 3. One end of the second sealing ring 15 along its axial direction abuts against the groove wall of the second stepped groove 14, and the other end abuts against the outer wall of the end of the guide sleeve 13. The outer wall of the pressure relief shaft 1 always abuts against the inner wall of the second sealing ring 15 and maintains a tight connection therewith. The cross-section of the second sealing ring 15 is a V-shaped structure, and the concave side of the second sealing ring 15 faces the middle of the sealing chamber 3. The second sealing ring 15 has the same function as the first sealing ring 9, and can improve the sealing effect and prevent liquid from leaking out from between the guide sleeve 13 and the inner wall of the sealing chamber 3, and between the guide sleeve 13 and the pressure relief shaft 1.

[0037] The end of the pressure relief shaft 1 away from the pressure relief chamber 4 is sleeved and fixed with an abutment 16, and one end of the return spring 2 abuts against the abutment 16. The arrangement of the abutment 16 facilitates the driving device in the coffee machine to apply force to the abutment 16, thereby driving the pressure relief shaft 1 to move; at the same time, it is convenient for the installation of the return spring 2.

[0038] One end of the pressure relief chamber 4 is inserted into the sealing chamber 3, and an annular groove 17 is circumferentially provided on the outer wall of the end. A third sealing ring 18 is sleeved in the annular groove 17. The third sealing ring 18 is also made of elastic material to improve the sealing between the inner wall of the pressure relief chamber 4 and the outer wall of the sealing chamber 3.

[0039] This embodiment also discloses a coffee machine, comprising the above-mentioned pressure relief device. The pressure relief device connects or disconnects the sealed chamber 3 and the pressure relief chamber 4 by moving the pressure relief shaft 1 along its axial direction; it has a simple structure, stable and convenient operation, the pipeline channel is not easily blocked during pressure relief, has strong stability in use, and has low maintenance cost.

[0040] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A pressure relief device for a coffee machine, characterized in that: It includes a pressure relief shaft, a sealing chamber and a pressure relief chamber; the sealing chamber and the pressure relief chamber are connected in sequence, one end of the pressure relief shaft extends to the outside of the sealing chamber away from the pressure relief chamber, and the other end moves along its axial direction between the sealing chamber and the pressure relief chamber to connect or disconnect the sealing chamber and the pressure relief chamber; the sealing chamber is connected with a water inlet channel and a water outlet channel, and the pressure relief chamber is connected with a pressure relief channel; a guide sleeve is provided on the inner wall of one end of the sealing chamber away from the pressure relief chamber, and the pressure relief shaft is movably inserted into the guide sleeve; the pressure relief device also includes a reset member, and the reset member is used to apply a force to the pressure relief shaft away from the pressure relief chamber.

2. A pressure relief device for a coffee machine according to claim 1, characterized in that: An elastic first sealing ring is arranged at the connection between the sealing chamber and the pressure relief chamber, and a pressure relief section and a sealing section are arranged in sequence along the sealing chamber toward the pressure relief chamber on the pressure relief shaft, the diameter of the pressure relief section is smaller than the inner diameter of the first sealing ring, and the diameter of the sealing section is larger than the inner diameter of the first sealing ring and smaller than the inner diameter of the pressure relief chamber; when the pressure relief section is passed through the first sealing ring, the sealing chamber is communicated with the pressure relief chamber; when the sealing section is passed through the first sealing ring, the sealing chamber is disconnected from the pressure relief chamber.

3. A pressure relief device for a coffee machine according to claim 2, characterized in that: The cross section of the first sealing ring is in a V-shaped structure, and the concave side of the first sealing ring faces the middle of the sealing chamber.

4. A pressure relief device for a coffee machine according to claim 1, characterized in that: A second elastic sealing ring is arranged on one side of the guide sleeve facing the middle of the sealing chamber, and the outer wall of the pressure relief shaft is always pressed against the inner wall of the second sealing ring.

5. A pressure relief device for a coffee machine according to claim 4, characterized in that: The cross section of the second sealing ring is in a V-shaped structure, and the concave side of the second sealing ring faces the middle of the sealing chamber.

6. The pressure relief device for a coffee machine according to claim 1, characterized in that: The reset member comprises a reset spring, and the reset spring is sleeved on the portion of the pressure relief shaft extending outside the sealing chamber.

7. The pressure relief device for a coffee machine according to claim 1, characterized in that: An abutment joint is arranged at one end of the pressure relief shaft away from the pressure relief chamber, and one end of the reset member abuts against the abutment joint.

8. A coffee machine, characterized in that: A pressure relief device comprising the pressure relief device according to any one of claims 1 to 7.

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