Vibration reduction variable pressure valve and coffee machine

Abstract

The utility model relates to a vibration damping variable pressure valve and coffee machine, the coffee machine includes vibration damping variable pressure valve, vibration damping variable pressure valve includes valve body, valve core, adjusting spring and adjusting gland, the valve body is provided with valve core hole, valve core water inlet hole and valve core drain hole, valve core water inlet hole is provided on the bottom wall of the valve core hole, the valve core water inlet hole is provided on the bottom wall of the valve core hole, and the valve core drain hole is provided on the bottom wall of the valve core hole. The valve element is movably connected to the valve element water inlet hole in a pressed mode under the action of the adjusting spring, a first adjusting cavity is further formed in the valve body, the valve element water inlet hole is communicated with the valve element hole and the first adjusting cavity, and a first water inlet hole is formed in the wall body of the first adjusting cavity. Water flow sequentially passes through the first water inlet hole, the first adjusting cavity and the valve element water inlet hole and then flows into the valve element hole, and the variable water flow speed can effectively reduce the probability of resonance of the valve body.

Description

Technical Field

[0001] The utility model relates to the field related to coffee machines, and in particular to a vibration-damping pressure-changing valve and a coffee machine. Background Art

[0002] Existing coffee machines typically include a water tank, a water pump, a heating boiler, and an extraction device, all of which are connected by water pipes. Because the extraction device contains coffee grounds and a fine filter, the continuous delivery of the water pump generates a high pressure within the delivery pipe. Because extraction pressure significantly affects the release of coffee flavors, to improve extraction, coffee extraction must be performed within a specified pressure range. To this end, coffee machines typically also include a pressure control valve. For example, utility model patent publication number CN205207808U discloses a pressure regulating valve for a coffee machine. The valve comprises a hollow valve body with a water inlet located below and a water outlet located on the side. A spring is disposed within the valve body, and a valve core is positioned below the valve body, abutting the water inlet. A spring seat is disposed above the valve body, with one end of the spring abutting the valve core and the other end abutting the spring seat. The valve also includes an adjustment sleeve. During use, the adjustment sleeve is rotated to drive the spring seat in axial motion, thereby adjusting the compression of the spring. Although this structure can adjust the water outlet pressure to achieve the purpose of improving the coffee extraction effect, in actual use, there will be a serious problem of valve body vibration. This is because when the valve body is relieved of pressure, water flows rapidly into the valve body through the water inlet and impacts the valve core and the adjustment spring. When the water flow speed reaches a certain level, it will excite the natural vibration frequency of the compressed adjustment spring or the valve body, causing the valve body to resonate or the valve core to open and close at a high frequency. Utility Model Content

[0003] The utility model aims to solve the above-mentioned problems and provides a vibration-damping pressure-changing valve, comprising a valve body, a valve core, an adjusting spring and an adjusting gland. The valve body is provided with a valve core hole, a valve core water inlet hole and a valve core drain hole. The valve core water inlet hole is arranged on the bottom wall of the valve core hole, the valve core and the adjusting spring are arranged in the valve core hole, the adjusting gland is movably connected to the open part of the valve core hole, the two ends of the adjusting spring are respectively pressed on the valve core and the adjusting gland, and under the action of the adjusting spring, the valve core can be movably pressed on the valve core inlet hole. On the water hole; a first regulating chamber is also provided on the valve body, the valve core water inlet hole connects the valve core hole and the first regulating chamber, and at least one first water inlet hole is also provided on the wall of the first regulating chamber, the cross-sectional area of ​​the valve core water inlet hole is larger than the cross-sectional area of ​​the first water inlet hole, and the cross-sectional area of ​​the first regulating chamber is respectively larger than the cross-sectional area of ​​the valve core water inlet hole and the cross-sectional area of ​​the first water inlet hole. The water in the external pipeline can pass through the first water inlet hole, the first regulating chamber, the valve core water inlet hole, the valve core hole and the valve core drain hole in sequence and finally be discharged to the outside of the valve body.

[0004] Among them, the first regulating chamber is a cavity arranged upstream of the valve core hole, and the two chambers are connected through the valve core water inlet hole. In order to form a buffer chamber, the first regulating chamber has a certain axial extension length, and its length is generally set to between 5mm and 50mm. The cross-sectional area of ​​the first regulating chamber is also set to be larger than the cross-sectional area of ​​the valve core hole and the first water inlet hole. In addition, the cross-sectional shapes of the valve core hole, the first water inlet hole and the first water inlet hole mentioned below can be various, such as the common circular shape, or square, polygonal, etc. Further, the number of the first water inlet holes is commonly set to one, two, three, four or more, but in order to better achieve the change of the frequency of water inlet, the cross-sectional area of ​​the first water inlet hole mentioned here refers to the sum of the cross-sectional areas of all the first water inlet holes.

[0005] Preferably, the first regulating chamber is arranged on the outer side of the bottom wall of the valve core hole.

[0006] Preferably, the first water inlet hole and the valve core water inlet hole are respectively arranged on two walls of the first regulating chamber.

[0007] Preferably, the first water inlet hole and the valve core water inlet hole are arranged in a staggered manner. There are at least two implementation methods for the staggered arrangement. The first is that the center lines of the first water inlet hole and the valve core water inlet hole are arranged parallel but not overlapped, that is, the first water inlet hole and the valve core water inlet hole are arranged on two oppositely arranged walls or on the same wall, but the two holes are staggered from each other when viewed along the center line. The second is that the center lines of the first water inlet hole and the valve core water inlet hole are arranged at an angle. For example, the first water inlet hole and the valve core water inlet hole are arranged on two intersecting walls, and the center lines of the first water inlet hole and the valve core water inlet hole intersect or are staggered, and the two center lines form a plane angle or a spatial angle. Common angles are 60°, 70°, 80° and 90°.

[0008] Preferably, at least two first water inlet holes are provided on the wall of the first regulating chamber, and the center lines of the first water inlet holes are arranged in parallel.

[0009] Preferably, the valve body is an integrally molded component, the valve core hole and the first regulating chamber are two holes respectively arranged on the valve body, and the bottom wall of the valve core hole is a wall separating the valve core hole and the first regulating chamber; a first opening is provided at one end of the first regulating chamber, and also includes a first chamber connecting cover, the first chamber connecting cover is sealed and connected to the first opening, and the first water inlet hole is provided on the first chamber connecting cover or the other end wall of the first regulating chamber.

[0010] Preferably, a second regulating chamber is also provided on the valve body, the first water inlet hole connects the first regulating chamber with the second regulating chamber, and the second regulating chamber also includes a second water inlet hole, and water in the external pipeline can enter the second regulating chamber through the second water inlet hole, and the cross-sectional area of ​​the second regulating chamber is larger than the cross-sectional area of ​​the first water inlet hole and the cross-sectional area of ​​the second water inlet hole.

[0011] Preferably, the valve body is an integrally formed component, the valve core hole, the first regulating chamber and the second regulating chamber are three holes respectively arranged on the valve body, the bottom wall of the valve core hole is a wall body separating the valve core hole and the first regulating chamber, and the valve core water inlet hole is arranged on the bottom wall of the valve core hole; a partition wall body is provided between the first regulating chamber and the second regulating chamber, the first water inlet hole is provided on the partition wall body and connects the first regulating chamber and the second regulating chamber, the first regulating chamber includes a first opening, and the second regulating chamber also includes a second opening; the vibration damping and pressure-changing valve also includes a first chamber connecting cover and a second chamber connecting cover, the first sealing cover is sealed connected to the first opening, the second sealing cover is sealed connected to the second opening, and the second water inlet hole is provided on the second chamber connecting cover or an adjacent wall body.

[0012] A coffee machine includes a water pump, a heating device, and an extraction device, wherein the water pump and the heating device are connected via a first delivery pipe, and the heating device and the extraction device are connected via a second delivery pipe. The machine also includes the vibration-damping pressure-changing valve and a water supply pipe, wherein the vibration-damping pressure-changing valve is connected to the first delivery pipe via the water supply pipe.

[0013] Preferably, it further comprises a water tank, a water outlet pipe and a return pipe, wherein the water outlet pipe is connected between the water tank and the water pump, and the return pipe is connected between the drain hole of the vibration-damping pressure-changing valve and the water tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First, by arranging the first regulating chamber and the first water inlet hole upstream of the valve core water inlet hole, when the valve core is opened to release pressure, part of the water in the first regulating chamber quickly passes through the valve core water inlet hole into the valve core hole, but because the cross-sectional area of ​​the valve core water inlet hole is larger than the cross-sectional area of ​​the first water inlet hole, the amount of water replenished into the first regulating chamber by the first water inlet hole is less than the amount of water discharged from the valve core water inlet hole, and the pressure in the first regulating chamber will become lower, which makes the flow rate of water flowing into the valve core hole from the valve core water inlet hole later also relatively lower, and the change in the flow rate of the water flow is equivalent to changing The frequency of water flow and the changing frequency of water flow greatly reduce the probability of exciting the resonance between the valve body and the valve core spring; secondly, by arranging the first regulating chamber and the first water inlet hole upstream of the valve core water inlet hole, the water can be buffered to a certain extent before entering the valve core water inlet hole, which is beneficial to reduce the formation of vortex in the pipeline due to the sudden narrowing of the flow channel, and can make the water flow smooth and effectively reduce the impact of the water flow on the valve body; thirdly, the first water inlet hole and the valve core water inlet hole are staggered with each other, especially when the center lines of the first water inlet hole and the valve core water inlet hole are arranged at 90°, the water flow can fully fill the first regulating chamber, so that the first regulating chamber can play a buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the coffee machine;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the vibration-damping pressure-changing valve. DETAILED DESCRIPTION

[0017] The vibration-damping pressure-changing valve 2 of the present invention and the coffee machine to which it is applied will be further described below with reference to the accompanying drawings.

[0018] like Figure 1Figure 1 shows a coffee machine comprising a water tank 11, a water pump 12, a heating device 13, and an extraction device 14. The water pump 12 and the heating device 13 are connected via a first delivery pipe 15, the heating device 13 and the extraction device 14 are connected via a second delivery pipe 16, and the water tank 11 and the water pump 12 are connected via a water outlet pipe 17. To control the pressure in the delivery pipes, the machine further comprises a damping and pressure-changing valve 2, a water supply pipe 18, and a return pipe 19. The damping and pressure-changing valve 2 is connected to the first delivery pipe 15 via the water supply pipe 18, and the return pipe 19 is connected between the drain hole of the damping and pressure-changing valve 2 and the water tank 11. In this way, the coffee machine forms a pressure-adjustable system, comprising an extraction water circuit. The water pump 12 draws cold water from the water tank 11, which is then delivered to the heating device 13 via the first delivery pipe 15. The heating device 13 heats the cold water into hot water, which is then delivered to the extraction device 14 via the second delivery pipe 16 for coffee extraction. The system also comprises a pressure-regulating water circuit. Cold water flowing through the first delivery pipe 15 can flow through the water supply pipe 18 to the damping and pressure-changing valve 2. When the damping and pressure-changing valve 2 releases pressure, the water output returns to the water tank 11 via the return pipe 19. Of course, in other equivalent embodiments, the coffee machine does not have a water tank 11 but is connected to a tap water pipe. When the damping and pressure-changing valve 2 releases pressure, the water output flows through the return pipe 19 to an external portion of the coffee machine, such as a wastewater container or a sewer.

[0019] like Figure 2 The figure shows the vibration damping variable pressure valve 2, which includes a valve body 3, a valve core 4, an adjusting spring 5 and an adjusting gland 6. The valve body 3 is provided with a valve core hole 30, a valve core water inlet hole 31 and a valve core drain hole 32. The valve core water inlet hole 31 is provided on the bottom wall of the valve core hole 30. The valve core 4 and the adjusting spring 5 are provided in the valve core hole 30. The adjusting gland 6 is movably connected to the open part of the valve core hole 30. The two ends of the adjusting spring 5 are respectively pressed on the valve core 4 and the adjusting gland 6. Under the action of the adjusting spring 5, the valve core 4 can be movably pressed on the valve core water inlet hole 31; the valve body 3 is provided with a valve core hole 30, and the valve core 4 is provided with a valve core water inlet hole 31. A first regulating chamber 33 is also provided, and the valve core water inlet hole 31 connects the valve core hole 30 and the first regulating chamber 33. At least one first water inlet hole 34 is also provided on the wall of the first regulating chamber 33. The cross-sectional area of ​​the valve core water inlet hole 31 is larger than the cross-sectional area of ​​the first water inlet hole 34. The cross-sectional area of ​​the first regulating chamber 33 is larger than the cross-sectional area of ​​the valve core water inlet hole 31 and the cross-sectional area of ​​the first water inlet hole 34 respectively. The water in the external pipeline can pass through the first water inlet hole 34, the first regulating chamber 33, the valve core water inlet hole 31, the valve core hole 30 and the valve core drain hole 32 in sequence and finally be discharged to the outside of the valve body 3.

[0020] In this embodiment, the first regulating chamber 33 is a cavity provided upstream of the valve core hole 30. Figure 2 As shown, the first regulating chamber 33 is disposed outside the bottom wall of the valve core hole 30. The first regulating chamber 33 has a certain axial extension length, which is generally set to be between 5 mm and 50 mm. In addition, the cross-sectional area of ​​the first regulating chamber 33 is set to be larger than the cross-sectional areas of the valve core hole 30 and the first water inlet hole 34. In this way, a certain amount of water can be stored in the first regulating chamber 33. When the valve core 4 is opened, a portion of the water stored in the first regulating chamber 33 can be discharged first, and then external water can be replenished into the first regulating chamber 33 through the first water inlet hole 34.

[0021] Furthermore, the first water inlet hole 34 and the valve core water inlet hole 31 are respectively arranged on two walls of the first regulating chamber 33, and the first water inlet hole 34 and the valve core water inlet hole 31 are staggered with each other. Figure 2 As shown, the first water inlet hole 34 and the valve core water inlet hole 31 are arranged on two intersecting walls. The center lines of the first water inlet hole 34 and the valve core water inlet hole 31 intersect or are staggered, and the two center lines form a plane angle or a spatial angle. In this embodiment, the two center lines are arranged perpendicularly, that is, the angle is 90°. The angle between the two center lines can also be 60°, 70° or 80°, etc. In another equivalent embodiment, the first water inlet hole 34 and the center line of the valve core water inlet hole 31 are arranged parallel to but do not overlap, that is, the first water inlet hole 34 and the valve core water inlet hole 31 are arranged on two oppositely arranged walls or on the same wall, but the two holes are staggered when viewed along the center line direction.

[0022] Furthermore, at least one first water inlet hole 34 is provided on the wall of the first regulating chamber 33, and there are the following two situations. The first is as in the present embodiment, in which only one first water inlet hole 34 is provided on the wall of the first regulating chamber 33, and the cross-sections of the first water inlet hole 34 and the valve core hole 30 are both circular. Of course, in other equivalent embodiments, the cross-sections of the first water inlet hole 34 and the valve core hole 30 may also be square or other polygonal. The second is that two or more first water inlet holes 34 are provided on the wall of the first regulating chamber 33, and the center lines of the first water inlet holes 34 are arranged in parallel. In the second case, the cross-sectional area of ​​the first water inlet hole 34 refers to the sum of the cross-sectional areas of all the first water inlet holes 34.

[0023] Furthermore, the valve body 3 can be composed of multiple components, different holes or chambers are arranged on different components, or it can be an integrally molded component, the valve core hole 30 and the first regulating chamber 33 are two holes respectively arranged on the valve body 3, and the bottom wall of the valve core hole 30 is a wall separating the valve core hole 30 and the first regulating chamber 33; one end of the first regulating chamber 33 is provided with a first opening 331, and also includes a first chamber connecting cover 7, the first chamber connecting cover 7 is sealed and connected to the first opening 331, and the first water inlet hole 34 is provided on the first chamber connecting cover 7 or the other end wall of the first regulating chamber 33.

[0024] In order to further reduce the impact of water flow on the valve body 3, a second regulating chamber 35 is also provided on the valve body 3. The first water inlet 34 connects the first regulating chamber 33 and the second regulating chamber 35. The second regulating chamber 35 also includes a second water inlet 36. Water in the external pipeline can enter the second regulating chamber 35 through the second water inlet 36. The cross-sectional area of ​​the second regulating chamber 35 is larger than the cross-sectional area of ​​the first water inlet 34 and the cross-sectional area of ​​the second water inlet 36.

[0025] Preferably, the valve body 3 is an integrally molded component, the valve core hole 30, the first regulating chamber 33 and the second regulating chamber 35 are three holes respectively arranged on the valve body 3, the bottom wall of the valve core hole 30 is a wall separating the valve core hole 30 and the first regulating chamber 33, and the valve core water inlet hole 31 is arranged on the bottom wall of the valve core hole 30; a partition wall is provided between the first regulating chamber 33 and the second regulating chamber 35, the first water inlet hole 34 is provided on the partition wall and connects the first regulating chamber 33 and the second regulating chamber 35, the first regulating chamber 33 includes a first opening 331, and the second regulating chamber 35 also includes a second opening 351; the vibration damping and pressure-changing valve 2 also includes a first chamber connecting cover 7 and a second chamber connecting cover 8, the first sealing cover is sealed connected to the first opening 331, the second sealing cover is sealed connected to the second opening 351, and the second water inlet hole 36 is provided on the second chamber connecting cover 8 or an adjacent wall.

[0026] Compared with the prior art, the present invention has the following beneficial effects: First, by arranging the first regulating chamber 33 and the first water inlet hole 34 upstream of the valve core water inlet hole 31, when the valve core 4 is opened to release pressure, part of the water in the first regulating chamber 33 quickly passes through the valve core water inlet hole 31 into the valve core hole 30, but because the cross-sectional area of ​​the valve core water inlet hole 31 is larger than the cross-sectional area of ​​the first water inlet hole 34, the amount of water replenished into the first regulating chamber 33 by the first water inlet hole 34 is less than the amount of water discharged from the valve core water inlet hole 31, and the pressure in the first regulating chamber 33 will become lower, which makes the flow rate of water flowing from the valve core water inlet hole 31 into the valve core hole 30 later also relatively lower, and the change in the flow rate of the water flow is equivalent to The frequency of the water flow is changed, and the changed water flow frequency greatly reduces the probability of exciting the resonance of the valve body 3 and the valve core 4 spring; secondly, by arranging the first regulating chamber 33 and the first water inlet hole 34 upstream of the valve core water inlet hole 31, the water can also be buffered to a certain extent before entering the valve core water inlet hole 31, which is beneficial to reduce the formation of vortexes in the pipeline due to the sudden narrowing of the flow channel, and can make the water flow smooth and effectively reduce the impact of the water flow on the valve body 3; thirdly, the first water inlet hole 34 and the valve core water inlet hole 31 are staggered with each other, especially when the center line of the first water inlet hole 34 and the valve core water inlet hole 31 is arranged at 90°, the water flow can fully fill the first regulating chamber 33, so that the first regulating chamber 33 can play a buffering role.

[0027] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A vibration-damping pressure-changing valve, comprising a valve body, a valve core, an adjusting spring, and an adjusting gland, wherein the valve body is provided with a valve core hole, a valve core water inlet hole, and a valve core drain hole, the valve core water inlet hole being provided on the bottom wall of the valve core hole, the valve core and the adjusting spring being provided in the valve core hole, the adjusting gland being movably connected to the open portion of the valve core hole, the two ends of the adjusting spring respectively pressing on the valve core and the adjusting gland, and under the action of the adjusting spring, the valve core being movably pressed on the valve core water inlet hole; characterized in that A first regulating chamber is also provided on the valve body, and the valve core water inlet hole connects the valve core hole and the first regulating chamber. At least one first water inlet hole is also provided on the wall of the first regulating chamber. The cross-sectional area of ​​the valve core water inlet hole is larger than the cross-sectional area of ​​the first water inlet hole, and the cross-sectional area of ​​the first regulating chamber is larger than the cross-sectional area of ​​the valve core water inlet hole and the cross-sectional area of ​​the first water inlet hole, respectively. Water in the external pipeline can pass through the first water inlet hole, the first regulating chamber, the valve core water inlet hole, the valve core hole and the valve core drain hole in sequence and finally be discharged to the outside of the valve body.

2. The vibration damping and pressure-changing valve according to claim 1, characterized in that: The first regulating chamber is arranged on the outer side of the bottom wall of the valve core hole.

3. The vibration damping and pressure-changing valve according to claim 2, characterized in that: The first water inlet hole and the valve core water inlet hole are respectively arranged on two walls of the first regulating chamber.

4. The vibration damping and pressure-changing valve according to claim 1, characterized in that: The first water inlet hole and the valve core water inlet hole are arranged in a staggered manner.

5. The vibration damping and pressure-changing valve according to claim 1, characterized in that: At least two first water inlet holes are provided on the wall of the first regulating chamber, and center lines of the first water inlet holes are arranged in parallel.

6. The vibration-damping pressure-changing valve according to any one of claims 1 to 5, characterized in that: The valve body is an integrally formed component, the valve core hole and the first regulating chamber are two holes respectively arranged on the valve body, and the bottom wall of the valve core hole is a wall separating the valve core hole and the first regulating chamber; a first opening is provided at one end of the first regulating chamber, and the first chamber connecting cover is also included, the first chamber connecting cover is sealed and connected to the first opening, and the first water inlet hole is provided on the first chamber connecting cover or the other end wall of the first regulating chamber.

7. The vibration-damping pressure-changing valve according to any one of claims 1 to 5, characterized in that: A second regulating chamber is also provided on the valve body, the first water inlet hole connects the first regulating chamber and the second regulating chamber, and the second regulating chamber also includes a second water inlet hole. Water in the external pipeline can enter the second regulating chamber through the second water inlet hole, and the cross-sectional area of ​​the second regulating chamber is larger than the cross-sectional area of ​​the first water inlet hole and the cross-sectional area of ​​the second water inlet hole.

8. The vibration damping and pressure-changing valve according to claim 7, characterized in that: The valve body is an integrally formed component, and the valve core hole, the first regulating chamber and the second regulating chamber are three holes respectively arranged on the valve body. The bottom wall of the valve core hole is a wall body separating the valve core hole and the first regulating chamber, and the valve core water inlet hole is arranged on the bottom wall of the valve core hole; a partition wall body is provided between the first regulating chamber and the second regulating chamber, the first water inlet hole is provided on the partition wall body and connects the first regulating chamber and the second regulating chamber, the first regulating chamber includes a first opening, and the second regulating chamber also includes a second opening; the vibration damping and pressure-changing valve also includes a first chamber connecting cover and a second chamber connecting cover, the first chamber connecting cover is sealed connected to the first opening, the second chamber connecting cover is sealed connected to the second opening, and the second water inlet hole is provided on the second chamber connecting cover or an adjacent wall body.

9. A coffee machine comprising a water pump, a heating device, and an extraction device, wherein the water pump and the heating device are connected via a first delivery pipe, and the heating device and the extraction device are connected via a second delivery pipe, characterized in that: It also includes the vibration-damping pressure-changing valve and a water supply pipe according to any one of claims 1 to 8, and the vibration-damping pressure-changing valve is connected to the first delivery pipe through the water supply pipe.

10. The coffee machine according to claim 9, characterized in that It also includes a water tank, a water outlet pipe and a return pipe. The water outlet pipe is connected between the water tank and the water pump, and the return pipe is connected between the drain hole of the vibration-damping pressure-changing valve and the water tank.

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