Pressure regulating valve for a portable coffee maker

Abstract

The utility model discloses a kind of pressure regulating valve for portable coffee machine, including valve seat and pressure regulating assembly, the pressure regulating assembly includes piston, elastic reset element, movable block, rotating rod and knob, piston is slidably arranged in the inside of water inlet chamber, one end of rotating rod extends into water inlet chamber and is transmission connection with the movable block arranged in the inside of water inlet chamber, the other end is connected with the knob arranged in the outside of valve seat, one end of elastic reset element is abutted with piston, the other end is abutted with movable block, and the inner wall of valve seat is equipped with the limiting boss for limiting movable block sliding displacement, after being adjusted to maximum preset pressure value, movable block and limiting block abut each other, at this time, continue to rotate knob, the interval size between movable block and piston and the pre-tightening force of spring will not change again, the design can effectively avoid coffee machine pressure excessive regulation.

Description

Technical Field

[0001] This utility model relates to the field of pressure regulating valve technology, specifically a pressure regulating valve for portable coffee machines. Background Technology

[0002] Among the various performance indicators of a coffee machine, pressure control is one of the core factors affecting the taste and quality of coffee. Appropriate extraction pressure can fully extract the flavor substances in coffee powder, giving coffee a rich aroma, mellow taste and rich layers of flavor.

[0003] Traditional coffee machine pressure regulating valves mainly consist of a valve body, knob, spring, and movable block. Their working principle is based on the balance between spring force and fluid pressure. When the knob is rotated, it drives the movable block to move within the valve body via a threaded transmission mechanism. The change in the movable block's position alters the valve opening, thereby regulating the flow rate and pressure of the fluid passing through the pressure regulating valve. The spring, positioned between the movable block and the valve body, provides a counter-force to the movable block. During adjustment, as the movable block moves towards reducing the valve opening, the fluid pressure gradually increases. When the fluid pressure and spring force reach equilibrium, the pressure regulating valve outputs a stable pressure value. By rotating the knob to change the initial position of the movable block, different pressure equilibrium points can be preset, achieving the pressure regulation function.

[0004] However, traditional pressure regulating valves are not designed with limiting mechanisms for the movement range of the moving block. After adjusting to the maximum preset pressure value, although the fluid pressure and spring force reach a balance under the preset conditions, the moving block will continue to move due to the screw drive when the knob is turned further. This causes the valve opening to decrease further and the fluid pressure to rise sharply. On the one hand, excessive pressure adjustment will cause the coffee grounds to be over-extracted, resulting in a bitter and burnt coffee taste, which will destroy the original flavor balance of the coffee. On the other hand, excessive pressure may exceed the bearing limits of other parts of the coffee machine (such as pipes, pumps, boilers, etc.), causing damage to components, such as pipe rupture, pump seal failure, boiler deformation, etc. In addition, when the coffee machine is in an excessive pressure adjustment state for a long time, the internal components of the coffee machine will be subjected to stresses that exceed the design standards, which will accelerate the wear and aging of the components, shorten the service life of the coffee machine, and increase maintenance and operating costs. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a pressure regulating valve for portable coffee machines, which can effectively solve the technical problems mentioned in the background art.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a pressure regulating valve for a portable coffee machine, including a valve seat and a pressure regulating assembly. The valve seat is hollow inside to form a water inlet chamber. One end of the valve seat is provided with a water inlet hole, and the other end is provided with a water outlet hole. The water inlet hole and the water outlet hole are respectively connected to the water inlet chamber. The water inlet hole is provided with a silicone cap, and the water outlet hole is provided with a pressure relief pipe. The silicone cap is provided with a water inlet channel that communicates with the water inlet chamber, and the pressure relief pipe is provided with a pressure relief channel that communicates with the water inlet chamber. The pressure regulating assembly includes a piston, an elastic reset element, a movable block, a rotating rod, and a knob. The piston is slidably disposed inside the water inlet chamber. One end of the rotating rod extends into the water inlet chamber and is connected to the movable block disposed inside the water inlet chamber. The other end is connected to the knob disposed outside the valve seat. One end of the elastic reset element abuts against the piston, and the other end abuts against the movable block. The inner wall of the valve seat is provided with a limiting protrusion for limiting the sliding displacement of the movable block.

[0007] Furthermore, one end of the valve seat is fitted with a nut, the nut has a through hole in the middle, the rotating rod passes through the through hole and is connected to the knob, and there is a rotation gap between the rotating rod and the through hole.

[0008] Furthermore, it also includes a sealing assembly, which includes a sealing gasket disposed inside the nut, and the valve seat has a connecting end, with the nut and the connecting end being connected by a threaded connection.

[0009] Furthermore, the rotating rod is provided with an abutting protrusion, and the sealing gasket has a hollow hole in the middle. The rotating rod passes through the hollow hole and the through hole in sequence and is connected to the knob. The sealing gasket and the rotating rod are interference-fitted. The abutting protrusion is located on the side of the sealing gasket away from the inner wall sealing surface of the nut, and the outer diameter of the abutting protrusion is larger than the diameter of the hollow hole to form a seal.

[0010] Furthermore, the outer surface of the rotating rod is provided with a threaded protrusion, and the inner wall of the movable block is provided with an internal thread that matches the threaded protrusion.

[0011] Furthermore, the inner wall of the connecting end is provided with a guide protrusion, and the movable block is provided with a guide groove that matches the guide protrusion. The guide protrusion is embedded in the guide groove, so that the movable block can slide along the guide protrusion.

[0012] Furthermore, the sealing assembly also includes a first sealing ring and a second sealing ring, wherein the first sealing ring is disposed at the connection between the silicone cap and the valve seat, and the second sealing ring is disposed at the connection between the pressure relief pipe and the valve seat.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The inner wall of the valve seat is provided with a limiting protrusion to limit the maximum sliding displacement of the moving block. After adjusting to the maximum preset pressure value, the moving block and the limiting block abut against each other. At this time, if the knob is turned again, the distance between the moving block and the piston and the preload of the spring will not change. This design can effectively prevent the coffee machine pressure from being over-adjusted. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a pressure regulating valve used in a portable coffee machine.

[0016] Figure 2 A cross-sectional view of a pressure regulating valve for a portable coffee machine;

[0017] Figure 3 An exploded view of the structure of a pressure regulating valve for a portable coffee machine;

[0018] Figure 4 This is a schematic diagram of the valve seat structure.

[0019] Numbering on the map:

[0020] 1. Valve seat; 2. Nut; 3. Water inlet; 4. Pressure relief pipe; 5. Knob; 6. Rotating rod; 7. Sealing gasket; 8. Moving block; 9. Limiting protrusion; 10. Pressure relief channel; 11. Piston; 12. Elastic reset element; 13. Silicone cap; 16. First sealing ring; 17. Second sealing ring; 18. Water inlet channel; 19. Abutting protrusion; 21. Connecting end; 22. Guide protrusion; 23. Guide groove; 24. Internal thread; 25. Threaded protrusion; 26. Water outlet. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1-4 As shown, this utility model provides a pressure regulating valve for a portable coffee machine, including a valve seat 1, a sealing assembly and a pressure regulating assembly. The valve seat 1 is hollow to form a water inlet chamber. One end of the valve seat 1 is provided with a water inlet hole 3 and the other end is provided with a water outlet hole 26. The water inlet hole 3 and the water outlet hole 26 are respectively connected to the water inlet chamber. The water inlet hole 3 is provided with a silicone cap 13 inside. The water outlet hole 26 is provided with a pressure relief pipe 4. The silicone cap 13 is provided with a water inlet channel 18 that is connected to the water inlet chamber. The pressure relief pipe 4 is provided with a pressure relief channel 10 that is connected to the water inlet chamber.

[0023] The pressure regulating assembly includes a piston 11, an elastic reset element 12, a movable block 8, a rotating rod 6, and a knob 5. The piston 11 is slidably disposed inside the water inlet chamber, and the outer periphery of the piston 11 forms a sealing fit with the inner wall of the valve seat 1. One end of the rotating rod 6 extends into the water inlet chamber and is connected to the movable block 8 disposed inside the water inlet chamber, and the other end is connected to the knob 5 disposed outside the valve seat 1. One end of the elastic reset element 12 abuts against the piston 11, and the other end abuts against the movable block 8. The inner wall of the valve seat 1 is provided with a limiting protrusion 9 for limiting the maximum sliding displacement of the movable block 8.

[0024] The sealing assembly includes a first sealing ring 16, a second sealing ring 17, and a sealing gasket 7. One end of the valve seat 1 is fitted with a nut 2. The nut 2 has a through hole in the middle. The rotating rod 6 passes through the through hole and is connected to the knob 5. There is a rotation gap between the rotating rod 6 and the through hole. The design of the rotation gap can effectively reduce the torque value, so that the user can easily rotate the knob 5 to adjust the pressure.

[0025] The first sealing ring 16 is located at the connection between the silicone cap 13 and the valve seat 1, the second sealing ring 17 is located at the connection between the pressure relief pipe 4 and the valve seat 1, the sealing gasket 7 is located inside the nut 2, the valve seat 1 is provided with a connecting end 21, the outer surface of the connecting end 21 is formed with external threads, the nut 2 and the connecting end 21 are connected by threaded engagement, during the tightening process, the sealing gasket 7 is squeezed between the nut 2 and the connecting end 21 to form a seal, thereby improving the sealing performance;

[0026] The rotating rod 6 is provided with an abutting protrusion 19, and the sealing gasket 7 has a hole in the middle. The rotating rod 6 passes through the hole and the through hole in sequence and is connected to the knob 5. The sealing gasket 7 and the rotating rod 6 are interference-fitted. The abutting protrusion 19 is located on the side of the sealing gasket 7 away from the inner wall sealing surface of the nut 2, and the outer diameter of the abutting protrusion 19 is larger than the diameter of the hole to form a seal. Therefore, the rotating rod 6 can also ensure the sealing during rotation to prevent water from flowing out from the through hole.

[0027] The coffee machine is equipped with an assembly plate with mounting holes. Therefore, during the assembly of the pressure regulating valve with the coffee machine, the valve seat 1 is located at one end of the assembly plate, and the connecting end 21 passes through the mounting hole. The nut 2 is located at the other end of the assembly plate and is threadedly locked to the connecting end 21, so that the pressure regulating valve is fastened to the assembly plate.

[0028] The outer surface of the rotating rod 6 is provided with a threaded protrusion 25, and the inner wall of the movable block 8 is provided with an internal thread 24 that matches the threaded protrusion 25. When the knob 5 is rotated to drive the rotating rod 6 to rotate, the threaded protrusion 25 and the internal thread 24 cooperate with each other to convert the rotational motion into linear motion, driving the movable block 8 to overcome the elastic force of the elastic reset element 12 and move along the axis of the rotating rod 6 toward the piston 11. The stroke is long, thereby increasing the controllable pressure range. The inner wall of the connecting end 21 is provided with a guide protrusion 22, and the movable block 8 is provided with a guide groove 23 that matches the guide protrusion 22. The guide protrusion 22 is embedded in the guide groove 23, so that the movable block 8 can slide along the guide protrusion 22.

[0029] Working principle:

[0030] The elastic reset element 12 is a spring. In the initial stage, the spring is at its natural extension length and is not compressed by external force. The internal elastic potential energy is zero. Under the action of the spring thrust, the piston 11 is pressed against the end of the water inlet channel 18 and completely blocks the pressure relief channel 10. When the water pressure exceeds the spring's preload at this time, the water flow pushes the piston 11 to overcome the spring force and move along the direction of the movable block 8 until the piston 11 is pushed away and no longer blocks the pressure relief channel 10, and the water flows out from the pressure relief channel 10.

[0031] Rotating the knob 5 causes the rotating rod 6 to rotate synchronously with the knob 5. The threaded protrusion 25 and the internal thread 24 engage with each other, converting the rotational motion into linear motion. This drives the movable block 8 to overcome the elastic force of the elastic reset element 12 and move axially along the rotating rod 6 towards the piston 11. At this time, the spring is compressed, and the spring preload increases linearly with the increase in compression. The reverse elastic force on the piston 11 increases synchronously. Therefore, a higher water pressure is required to open the piston 11, thereby increasing the extraction pressure of the coffee machine. Conversely, rotating the knob 5 in the opposite direction causes the movable block 8 to move away from the piston 11 under the action of the threaded engagement. As the piston 11 moves, the spring preload gradually decreases, and the reverse spring force on the piston 11 also decreases simultaneously. The thrust of the water flow pushing the piston 11 also gradually decreases. The design of the knob 5 enables stepless adjustment and precise fine-tuning of the pressure. Furthermore, due to the design of the limiting protrusion 9, the maximum sliding displacement of the movable block 8 is limited. Therefore, after adjusting to the maximum preset pressure value, the movable block 8 and the limiting block abut against each other. At this time, if the knob 5 is continued to be rotated, the distance between the movable block 8 and the piston 11 and the spring preload will no longer change. This design can effectively prevent the coffee machine pressure from being over-adjusted.

[0032] Compared to traditional technologies:

[0033] 1. The inner wall of the valve seat 1 is provided with a limiting protrusion 9 to limit the maximum sliding displacement of the movable block 8. After adjusting to the maximum preset pressure value, the movable block 8 and the limiting block abut against each other. At this time, if the knob 5 is turned again, the distance between the movable block 8 and the piston 11 and the preload of the spring will not change. This design can effectively prevent the coffee machine pressure from being over-adjusted.

[0034] 2. The sealing gasket 7 is located inside the nut 2. The nut 2 and the connecting end 21 are connected by a thread. During the tightening process, the sealing gasket 7 is squeezed between the nut 2 and the connecting end 21 to form a seal, thereby improving the sealing performance. The sealing gasket 7 is interference-fitted with the rotating rod 6. The abutting protrusion 19 is located on the side of the sealing gasket 7 away from the inner wall sealing surface of the nut 2. The outer diameter of the abutting protrusion 19 is larger than the diameter of the hole to form a seal. Therefore, the rotating rod 6 can also ensure the sealing performance during rotation to prevent water from flowing out from the through hole.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pressure regulating valve for a portable coffee machine, comprising a valve seat and a pressure regulating assembly, wherein the valve seat is hollow to form a water inlet chamber, one end of the valve seat is provided with a water inlet hole, and the other end is provided with a water outlet hole, the water inlet hole and the water outlet hole respectively communicating with the water inlet chamber, wherein, The inlet hole is equipped with a silicone cap, and the outlet hole is equipped with a pressure relief pipe. The silicone cap has an inlet channel communicating with the inlet chamber, and the pressure relief pipe has a pressure relief channel communicating with the inlet chamber. The pressure regulating assembly includes a piston, an elastic reset element, a movable block, a rotating rod, and a knob. The piston is slidably disposed inside the inlet chamber. One end of the rotating rod extends into the inlet chamber and is connected to the movable block disposed inside the inlet chamber. The other end is connected to the knob disposed outside the valve seat. One end of the elastic reset element abuts against the piston, and the other end abuts against the movable block. The inner wall of the valve seat is provided with a limiting protrusion for limiting the sliding displacement of the movable block.

2. The pressure regulating valve for a portable coffee machine according to claim 1, characterized in that, One end of the valve seat is fitted with a nut, and the nut has a through hole in the middle. The rotating rod passes through the through hole and is connected to the knob. There is a rotation gap between the rotating rod and the through hole.

3. A pressure regulating valve for a portable coffee machine according to claim 2, characterized in that, It also includes a sealing assembly, which includes a sealing gasket disposed inside the nut, and the valve seat has a connecting end, and the nut and the connecting end are connected by threaded engagement.

4. A pressure regulating valve for a portable coffee machine according to claim 3, characterized in that, The rotating rod is provided with an abutting protrusion, and the sealing gasket is provided with a hollow hole in the middle. The rotating rod passes through the hollow hole and the through hole in sequence and is connected to the knob. The sealing gasket and the rotating rod are interference-fitted. The abutting protrusion is located on the side of the sealing gasket away from the inner wall sealing surface of the nut, and the outer diameter of the abutting protrusion is larger than the diameter of the hollow hole to form a seal.

5. A pressure regulating valve for a portable coffee machine according to claim 3, characterized in that, The outer surface of the rotating rod is provided with a threaded protrusion, and the inner wall of the movable block is provided with an internal thread that matches the threaded protrusion.

6. A pressure regulating valve for a portable coffee machine according to claim 5, characterized in that, The inner wall of the connecting end is provided with a guide protrusion, and the movable block is provided with a guide groove that matches the guide protrusion. The guide protrusion is embedded in the guide groove, so that the movable block can slide along the guide protrusion.

7. A pressure regulating valve for a portable coffee machine according to claim 3, characterized in that, The sealing assembly further includes a first sealing ring and a second sealing ring. The first sealing ring is located at the connection between the silicone cap and the valve seat, and the second sealing ring is located at the connection between the pressure relief pipe and the valve seat.

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