Mechanical pressure valve of coffee machine and coffee machine

Abstract

The utility model provides a mechanical pressure valve of a coffee machine and the coffee machine, the pressure valve comprises: an upper cover provided with a water inlet hole; the valve core is provided with a water passing hole; the lower cover and the upper cover are connected in a sealed mode to form a pressure relief cavity, and the pressure relief cavity is provided with the valve element; a drainage channel is arranged at the bottom of the pressure relief cavity, and a pressure limiting mechanism is arranged in the drainage channel. A water outlet hole and a water drainage hole are formed in the bottom wall of the pressure relief cavity, and the water drainage hole is communicated with the water drainage channel; a pressure limiting hole is formed in the side wall of the drainage channel and communicates with the pressure relief cavity. The pressure limiting mechanism can open or close the pressure limiting hole; the valve element can move in the pressure relief cavity so as to open or close the drainage hole. The mechanical pressure valve is simple in structure and is communicated with the drainage channel only through the drainage hole and the pressure limiting hole, and the functions of relieving pressure and limiting high pressure of a water path are achieved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure relates to the technical field of coffee valve, in particular to a mechanical pressure valve of a coffee machine and the coffee machine. BACKGROUND

[0002] The pressure relief valve of the coffee machine is an important safety component of the coffee machine, which is mainly used for controlling the pressure inside the machine to ensure that the process of making coffee will not cause danger due to excessive pressure.

[0003] At present, there are various types of pressure relief valves for coffee machines. For example, a coffee machine pressure relief valve is disclosed in Chinese Patent No. 202122246365.0, which includes a housing, a water inlet channel, a water outlet channel, an exhaust channel, and a safety channel. The water inlet channel and the water outlet channel are connected with the pipeline and communicate with each other. The exhaust channel and the water inlet channel communicate with each other. The safety channel and the water outlet channel communicate with each other. The exhaust channel and the safety channel of the patent, i.e. the pressure limiting channel, are two channels, which increases the volume of the pressure relief valve. The exhaust gas and water are collected through the drain channel in the drain cover and then discharged together, that is, the last joint is used to discharge air or water. The joint is fixed in a direction and cannot be adjusted, which brings inconvenience to the subsequent installation of the water pipe.

[0004] For example, a coffee machine pressure relief valve is disclosed in Chinese Patent No. 201420840992.4, which includes an upper cover, a water inlet pipe, a pressure relief pipe, a lower cover, a water outlet pipe, and a pressure relief valve core. The patent only has a pressure relief channel, i.e. the pressure relief pipe, but does not have the function of limiting the maximum pressure of the waterway. When the pressure in the waterway is too large and cannot be released, there is a safety hazard. Therefore, the utility model is proposed. CONTENT

[0005] The purpose of the embodiment of the present disclosure is to provide a mechanical pressure valve of a coffee machine and the coffee machine, so as to solve the aforementioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the embodiment of the present disclosure is as follows:

[0007] The embodiment of the present disclosure proposes a mechanical pressure valve of a coffee machine, which includes:

[0008] The upper cover is provided with a water inlet hole;

[0009] The valve core is provided with a water passing hole;

[0010] The lower cover is sealingly connected with the upper cover to form a pressure relief chamber, and the pressure relief chamber is provided with the valve core;

[0011] The bottom of the pressure relief chamber is provided with a drainage channel, and a pressure limiting mechanism is arranged in the drainage channel; the bottom wall of the pressure relief chamber is respectively provided with a water outlet hole and a drainage hole, and the drainage hole is communicated with the drainage channel; the side wall of the drainage channel is provided with a pressure limiting hole communicated with the pressure relief chamber; the pressure limiting mechanism can open or close the pressure limiting hole; the valve core can move in the pressure relief chamber to open or close the drainage hole.

[0012] Exemplarily, the valve core comprises a bottom wall and a side wall enclosing the edge end of the bottom wall, a reinforcing ring protruding in the same direction as the side wall is arranged in the central region of the bottom wall, and a groove is arranged in the reinforcing ring;

[0013] The central region of the bottom wall is provided with a tapered head away from the reinforcing ring, and the tapered head corresponds to the drainage hole.

[0014] Exemplarily, the valve core is a soft rubber diaphragm made of elastic soft rubber.

[0015] Exemplarily, the central region of the upper cover is provided with a water passing pipe protruding downward, the water passing pipe is communicated with the water inlet hole, and the end of the water passing pipe is matched with the groove;

[0016] The end side wall of the water passing pipe is provided with a water passing opening.

[0017] Exemplarily, the drainage hole is arranged in the central region of the bottom wall of the pressure relief chamber; a limiting ring is arranged around the drainage hole in the bottom wall of the pressure relief chamber, and a limiting surface matched with the tapered head is arranged at the end of the limiting ring, so that the limiting ring forms a tapered hole;

[0018] The limiting ring and the tapered head are sleeved with a reset elastic member.

[0019] Exemplarily, the pressure limiting mechanism comprises a pressure limiting valve sleeve, a valve plug, a pressure limiting sealing ring and a pressure limiting elastic member;

[0020] The pressure limiting valve sleeve is close to the pressure limiting hole, the first end central region of the pressure limiting valve sleeve is provided with a groove, the pressure limiting sealing ring is arranged in the groove, and the pressure limiting elastic member is arranged between the second end of the pressure limiting valve sleeve and the valve plug;

[0021] The axial central region of the valve plug is provided with a drainage hole.

[0022] Exemplarily, the inner side wall of the drainage channel is provided with an internal thread;

[0023] The radial dimension of the pressure limiting valve sleeve is smaller than that of the drainage channel, the outer side wall of the valve plug is provided with an external thread, and the valve plug is fixed with the drainage channel through the threads.

[0024] Exemplarily, the drainage channel is arranged on the side of the bottom wall of the lower cover away from the pressure relief chamber, and the bottom wall of the lower cover is provided with a connecting hole in communication with the pressure limiting hole.

[0025] Exemplarily, the side of the drainage channel away from the pressure limiting hole is an opening, and the side wall of the opening is provided with an engaging portion.

[0026] The pressure valve further comprises a drainage connector provided with a buckle.

[0027] The drainage channel and the drainage connector are detachably connected through the engaging portion and the buckle, and the connection between the drainage connector and the drainage channel can rotate 360° around the central axis of the drainage channel relative to the drainage channel.

[0028] Exemplarily, when the mechanical pressure valve has a conical hole and a reset elastic member, the valve core has a conical head, and the upper cover has a water passage;

[0029] In use, when the waterway pressure is normal, the water flow enters the pressure relief chamber from the water inlet hole of the upper cover, the water flow exerts pressure on the valve core, the valve core moves downward under the pressure, the conical head of the valve core and the conical hole of the lower cover are tightly sealed, and the water flow flows out from the water outlet hole of the lower cover;

[0030] When there is no water flow passing through the water inlet hole, the valve core moves upward under the action of the reset elastic member, the conical head of the valve core and the conical hole of the lower cover are separated, the pressure of the pipeline is discharged from the drainage hole through the drainage channel, and the water pressure of the pipeline is relieved;

[0031] When the water flow pressure exceeds the first preset threshold, the water flow exerts pressure on the pressure limiting sealing ring through the pressure limiting hole of the lower cover, the pressure limiting elastic member is compressed, the pressure limiting sealing ring moves away from the pressure limiting hole, the pressure limiting hole is opened, the water flow is discharged from the drainage channel, and the water pressure of the pipeline is relieved; when the pressure drops to the second preset threshold, the pressure limiting elastic member resets, the pressure limiting sealing ring seals the pressure limiting hole of the lower cover, and the normal working pressure of the waterway is maintained;

[0032] After the pressure limiting elastic member resets, the end of the water passage of the upper cover is tightly fitted in the groove, the water flow is discharged through the water passage, the water flow hole of the valve core and the drainage hole, and the water pressure of the pipeline is relieved.

[0033] Another aspect of the embodiment of the present disclosure provides a coffee machine, which comprises the mechanical pressure valve as described above.

[0034] The embodiment of the present disclosure has the following beneficial effects:

[0035] The pressure valve of the embodiment of the present disclosure is simple in structure, does not separately arrange a pressure limiting pipeline, reduces the volume, and only communicates the drainage hole and the pressure limiting hole with the drainage channel to realize the functions of pressure relief and limiting high pressure of the waterway. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of a mechanical pressure valve structure of a coffee machine provided by an embodiment of the present disclosure;

[0037] Figure 2 is an exploded view of a mechanical pressure valve of a coffee machine provided by an embodiment of the present disclosure;

[0038] Figure 3 is Figure 1 A-A direction cross-sectional view thereof;

[0039] Figure 4 is Figure 1 B-B direction cross-sectional view thereof;

[0040] Figure 5 is a schematic diagram of a drain connector disassembly structure of a mechanical pressure valve of a coffee machine provided by an embodiment of the present disclosure.

[0041] in the figure,

[0042] 1, mechanical pressure valve; 2, upper cover; 21, water inlet hole; 22, water passage; 3, valve core; 31, valve core water passage; 32, cone head; 4, reset elastic member; 5, lower cover; 51, pressure limiting hole; 52, water outlet hole; 53, conical hole; 54, drain passage; 55, drain hole; 6, pressure limiting mechanism; 61, pressure limiting sealing ring; 62, pressure limiting valve sleeve; 63, pressure limiting elastic member; 64, valve plug; 7, drain connector; 71, buckle; 8, screw. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the embodiments of the present disclosure are further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present disclosure and not to limit the embodiments of the present disclosure.

[0044] As Figures 1 to 4 shown, an embodiment of the present disclosure provides a mechanical pressure valve of a coffee machine, which comprises: an upper cover 2 provided with a water inlet hole 21; a valve core 3 provided with a valve core water passage 31; a lower cover 5 sealingly connected with the upper cover 2 to form a pressure relief chamber (not marked in the figure), the pressure relief chamber being provided with the valve core 3; the bottom of the pressure relief chamber being provided with a drain passage 54, the drain passage 4 being provided with a pressure limiting mechanism 6; the bottom wall of the pressure relief chamber being provided with a water outlet hole 52 and a drain hole 55, the drain hole 55 being communicated with the drain passage 54, the water outlet hole 52 being used to communicate with a water outlet pipe (not marked in the figure); the side wall of the drain passage 54 being provided with a pressure limiting hole 51, the pressure limiting hole 51 being communicated with the pressure relief chamber, the pressure limiting mechanism 6 being capable of opening or closing the pressure limiting hole 51; the valve core 3 being movable in the pressure relief chamber to open or close the drain hole 55.

[0045] The upper cover and the lower cover in the embodiments of the present disclosure can be detachably connected through the screw 8. The upper cover is connected with a water inlet pipe. The hollow pipe of the water inlet pipe can be regarded as a water inlet hole. The water inlet pipe is connected to the central region of the upper cover. The central region of the upper cover is provided with a water passing pipe. The water passing pipe extends to the pressure relief chamber. One end of the water passing pipe is communicated with the water inlet pipe. The other end of the water passing pipe is connected to the pressure relief chamber. The other end of the water passing pipe is provided with an upper cover water passing hole 22. The drain passage and the water outlet pipe are both arranged on the side of the bottom wall of the lower cover away from the pressure relief chamber. The drain hole is communicated with the drain passage. The pressure limiting hole is communicated with the pressure relief chamber and the drain passage. In this way, the drain hole 55 and the pressure limiting hole 51 can share one drain passage 54. The mechanical pressure valve in the embodiments of the present disclosure has a simple structure and can realize the functions of pressure relief and pressure limiting of the waterway. Figure 4 As shown in the figure, the water outlet pipe (not marked in the figure) can be perpendicular to the drain pipe. The water outlet hole is communicated with the water outlet pipe.

[0046] The working principle of the mechanical pressure valve in the embodiments of the present disclosure is as follows: when the working pressure of the waterway is normal, the water flow enters the pressure relief chamber through the water inlet hole and the water passing hole of the upper cover. Under the action of water pressure, the valve core moves downward to the lower cover, closes the drain hole of the lower cover, and the water flow passes through the water passing hole of the valve core and the water outlet hole of the lower cover and flows out from the water outlet pipe. When there is no water flow in the water inlet hole, the valve core resets to move upward to the upper cover, opens the drain hole of the lower cover, and the water in the pipeline is discharged from the drain passage through the drain hole, thereby unloading the water pressure of the pipeline.

[0047] When the water flow pressure in the waterway exceeds the preset threshold value, the water flow presses the pressure limiting mechanism through the lower cover pressure limiting hole, the pressure limiting mechanism opens the pressure limiting hole, the water flow is discharged from the drain passage, and the water pressure of the pipeline is unloaded. When the waterway pressure decreases to the safety setting value, the pressure limiting mechanism resets to close the pressure limiting hole, thereby maintaining the normal working pressure of the waterway.

[0048] The mechanical pressure valve in the embodiments of the present disclosure has a simple structure and does not separately arrange a pressure limiting pipe. Only the drain hole and the pressure limiting hole are communicated with the drain passage, thereby realizing the functions of pressure relief and pressure limiting of the waterway.

[0049] As shown in the figure, as a specific example of the valve core, the valve core 3 includes a bottom wall and a side wall enclosed at the edge end of the bottom wall. The central region of the bottom wall is provided with a reinforcing ring protruding in the same direction as the side wall. The central region of the bottom wall is provided with a tapered head 32 away from the reinforcing ring. The tapered head 32 corresponds to the drain hole 55. Figure 2 Figure 3 The valve core is a soft rubber diaphragm made of elastic soft rubber. The valve core can be circular. The water passing hole of the valve core can be arranged outside the reinforcing ring. The larger end of the tapered head in the radial direction corresponds to the inside of the reinforcing ring. The position of the tapered head corresponds to the drain hole. The size of the tapered head matches the size of the drain hole.

[0050] The valve core is a soft rubber diaphragm made of elastic soft rubber. The valve core can be circular. The water passing hole of the valve core can be arranged outside the reinforcing ring. The larger end of the tapered head in the radial direction corresponds to the inside of the reinforcing ring. The position of the tapered head corresponds to the drain hole. The size of the tapered head matches the size of the drain hole. ​

[0051] As Figure 3 and Figure 4 shown, the upper cover 2 central region is provided with a water overflow pipe protruding downward from the lower cover, the water overflow pipe communicates with the water inlet hole 21, the water overflow pipe end matches the groove, and the water overflow pipe end side wall is provided with a water overflow port 22.

[0052] The water overflow pipe end matches the groove.

[0053] As Figure 3 shown, the drain hole 55 is arranged in the central region of the bottom wall of the pressure relief chamber, and a limiting ring is arranged around the drain hole 55 on the bottom wall of the pressure relief chamber, and the end of the limiting ring is provided with a limiting surface matched with the tapered head 32, so that the limiting ring forms a tapered hole 53, and the limiting ring and the tapered head 32 are sleeved with a reset elastic member.

[0054] That is, the bottom wall of the lower cover is provided with a limiting ring protruding into the pressure relief chamber around the drain hole, and the end of the limiting ring is provided with a limiting surface matched with the tapered head, so that the limiting ring forms a tapered hole matched with the tapered head. The reset elastic member is sleeved on the outside of the limiting ring and the tapered head, and the two ends thereof respectively abut against the edge of the tapered head of the valve core and the bottom wall of the lower cover. The reset elastic member can be a reset spring.

[0055] As Figure 3 shown, as one specific example of the pressure limiting mechanism, the pressure limiting mechanism 6 includes a pressure limiting valve sleeve 62, a valve plug 64, a pressure limiting sealing ring 61, and a pressure limiting elastic member 63; the pressure limiting valve sleeve 62 is close to the pressure limiting hole 51, the first end central region of the pressure limiting valve sleeve 62 is provided with a groove, the groove is provided with the pressure limiting sealing ring 61, and the second end of the pressure limiting valve sleeve 62 and the valve plug 64 are provided with the pressure limiting elastic member 63; the axial central region of the valve plug 64 is provided with a drain hole.

[0056] The second end of the pressure limiting valve sleeve and the first end of the valve plug are inwardly avoided to form clamping tables, the pressure limiting elastic member can be a pressure limiting spring, the pressure limiting spring is sleeved on the second end of the pressure limiting valve sleeve and the first end of the valve plug, and the two ends thereof respectively abut against the clamping tables of the second end of the pressure limiting valve sleeve and the first end of the valve plug. The pressure limiting sealing ring 61 can be a soft rubber material, such as silicone, which is water-tight. When pressure relief, the water flow entering the drain passage flows out from the drain hole.

[0057] As Figure 3 shown, the inner side wall of the drain passage 54 is provided with an internal thread; the radial dimension of the pressure limiting valve sleeve 62 is smaller than that of the drain passage 54, the outer side wall of the valve plug 64 is provided with an external thread, and the valve plug 64 is fixed with the drain passage 54 through the threads.

[0058] The radial dimension of the pressure-limiting valve sleeve is smaller than the drain passage, so that the pressure-limiting valve sleeve and the drain passage form a water passing gap, and when the pressure-limiting hole is opened, water flows away from the periphery of the end face of the pressure-limiting sealing ring and the water passing gap. The position of the valve plug in the drain passage can be adjusted, so that the pressure of the waterway can be adjusted.

[0059] As shown in Figure 3 The drain passage 54 is arranged on the side of the bottom wall of the lower cover 5 away from the pressure relief chamber, and the bottom wall of the lower cover 5 is provided with a connecting hole (not labeled in the figure) which is in communication with the pressure-limiting hole 51.

[0060] As shown in Figure 5 and ​ The side of the drain passage 54 away from the pressure-limiting hole is open, and the side wall of the open side is provided with a clamping part; the pressure valve further comprises a drain connector 7 provided with a buckle 71; the drain passage 54 and the drain connector 7 are detachably connected through the clamping part and the buckle, and the connection between the drain connector 7 and the drain passage 54 can rotate 360° relative to the drain passage around the central axis of the drain passage.

[0061] It should be noted that the drain passage 54 is a cylindrical body of revolution, and the drain connector 7 holds a flange on the drain connector 7 with three buckling positions, and the flange is the clamping part. The drain connector 7 and the drain passage 54 are coaxial, and after installation, the drain connector 7 can rotate 360 degrees, which is convenient for subsequent pipeline installation. A sealing ring can be arranged between the drain connector and the drain passage for sealing to prevent the discharged water from leaking at the connector. If the drain connector is made of soft rubber material, it can itself serve as a sealing function and does not need to be separately provided with a sealing ring.

[0062] The working principle of the mechanical pressure relief valve of the embodiment of the present disclosure is as follows:

[0063] In use, water flows from the upper cover water inlet hole 21 through the upper cover water passing hole 22, the water flow exerts pressure on the soft rubber diaphragm, the soft rubber diaphragm moves downward under the pressure, the diaphragm cone head 32 and the lower cover conical hole 53 are tightly sealed, and the water flow can only flow out from the lower cover water outlet hole 52. When there is no water flow in the water inlet hole 21, the soft rubber diaphragm moves upward under the action of the restoring spring, the diaphragm cone head 32 and the lower cover conical hole 53 are separated, the pressure of the pipeline is discharged from the drain hole 55 through the drain passage 54 through the drain connector 7, and the water pressure in the pipeline is relieved.

[0064] When the water flow pressure in the waterway exceeds the preset value, the water flow exerts pressure on the pressure-limiting sealing ring 61 through the lower cover pressure-limiting hole 51, the pressure-limiting spring is compressed, the pressure-limiting sealing ring 61 is opened, the water flow is discharged from the drain passage 54 through the drain connector 7, and the water pressure in the pipeline is relieved; when the pressure decreases to the safety setting value, the pressure-limiting spring resets, the pressure-limiting sealing ring 61 seals the lower cover pressure-limiting hole 51, and the normal working pressure of the waterway is maintained;

[0065] When the pressure limiting elastic member is reset, the end of the water passing pipe of the upper cover 2 is tightly fitted with the groove, and the water flow is discharged through the water passing port 22, the valve core water passing hole 31 and the drain hole 55 to release the water pressure of the pipeline. If there is still water flow after the pressure limiting elastic member is reset, the water flow pressure is small, and the water flow can be discharged through the water passing port 22, the water passing hole and the drain hole.

[0066] The preset value and the first preset threshold value, the safety setting value, i.e. the second preset threshold value, can be set according to actual conditions.

[0067] In another aspect, the disclosure provides a coffee machine, which comprises the mechanical pressure valve 1 as described above.

[0068] The above description is only the preferred embodiment of the disclosure, and it should be pointed out that, for those skilled in the art, without departing from the principle of the disclosure, some improvements and refinements can be made, which should be regarded as the protection scope of the disclosure.

Claims

1. A mechanical pressure valve for a coffee machine, characterized in that, The pressure valve comprises: an upper cover (2) provided with a water inlet hole (21); a valve core (3) provided with a water passing hole; a lower cover (5) sealingly connected with the upper cover (2) to form a pressure relief chamber, and the pressure relief chamber is provided with the valve core (3); a drain passage (54) is arranged at the bottom of the pressure relief chamber, and a pressure limiting mechanism (6) is arranged in the drain passage (54); a water outlet hole (52) and a drain hole (55) are respectively arranged on the bottom wall of the pressure relief chamber, and the drain hole (55) is communicated with the drain passage (54); a pressure limiting hole (51) is arranged on the side wall of the drain passage (54), and the pressure limiting hole (51) is communicated with the pressure relief chamber; the pressure limiting mechanism (6) can open or close the pressure limiting hole (51); the valve core (3) can move in the pressure relief chamber to open or close the drain hole (55).

2. The pressure valve of claim 1, wherein The valve core (3) comprises a bottom wall and a side wall surrounding the edge end of the bottom wall, a reinforcing ring protruding in the same direction as the side wall is arranged in the central region of the bottom wall, and a groove is arranged in the reinforcing ring; a taper head (32) is arranged in the central region of the bottom wall away from the reinforcing ring, and the taper head (32) corresponds to the drain hole (55).

3. The pressure valve of claim 2, wherein A water passing pipe protruding towards the lower cover is arranged in the central region of the upper cover, the water passing pipe is communicated with the water inlet hole, and the end of the water passing pipe is matched with the groove; a water passing hole is arranged on the side wall of the end of the water passing pipe.

4. The pressure valve of claim 2, wherein The drain hole (55) is arranged in the central region of the bottom wall of the pressure relief chamber; a limiting ring is arranged on the bottom wall of the pressure relief chamber around the drain hole, and a limiting surface matched with the taper head is arranged on the end of the limiting ring to form a taper hole (53); the limiting ring and the taper head (32) are sleeved with a reset elastic member (4).

5. Pressure valve according to any one of claims 1 to 4, characterized in that The pressure limiting mechanism (6) comprises a pressure limiting valve sleeve (62), a valve plug (64), a pressure limiting sealing ring (61) and a pressure limiting elastic member (63); the pressure limiting valve sleeve (62) is close to the pressure limiting hole (51), a groove is arranged in the central region of the first end of the pressure limiting valve sleeve (62), the pressure limiting sealing ring (61) is arranged in the groove, and the pressure limiting elastic member (63) is arranged between the second end of the pressure limiting valve sleeve (62) and the valve plug (64); an exhaust hole is arranged in the axial central region of the valve plug (64).

6. The pressure valve of claim 5, wherein An internal thread is arranged on the inner side wall of the drain passage (54); the radial dimension of the pressure limiting valve sleeve (62) is smaller than that of the drain passage (54), an external thread is arranged on the outer side wall of the valve plug (64), and the valve plug (64) is fixed with the drain passage (54) through the threads.

7. The pressure valve of claim 5, wherein The drain passage (54) is arranged on the side of the bottom wall of the lower cover away from the pressure relief chamber, and a connecting hole is arranged on the bottom wall of the lower cover (5), and the connecting hole is communicated with the pressure limiting hole (51).

8. Pressure valve according to any one of claims 1 to 4, characterized in that The side of the drain passage away from the pressure limiting hole is an opening, and a clamping part is arranged on the side wall of the opening; the pressure valve further comprises a drain connector (7) provided with a buckle (71). The drainage channel and the drainage joint are detachably connected through the engaging part and the buckle, and the connection part of the drainage joint and the drainage channel can rotate 360 degrees around the central axis of the drainage channel relative to the drainage channel.

9. The pressure valve of claim 5, wherein, When the mechanical pressure valve has a conical hole (53) and a reset spring (4), the valve core (3) has a conical head (32), and the upper cover (2) has a water passage, in use, the water pressure is normal, the water flow enters the relief chamber from the water inlet hole (21) of the upper cover (2), the water flow exerts pressure on the valve core (3), the valve core (3) moves downward under pressure, the conical head (32) of the valve core (3) and the conical hole (53) of the lower cover (5) are tightly sealed, and the water flow flows out from the water outlet hole (52) of the lower cover (5); When there is no water flow through the water inlet hole (21), the valve core (3) moves upward under the action of the reset spring (4), the conical head (32) of the valve core (3) and the conical hole (53) of the lower cover (5) are separated, the pressure of the pipeline is discharged from the drainage channel through the drainage hole (55), and the water pressure of the pipeline is discharged; When the water flow pressure exceeds the first preset threshold, the water flow exerts pressure on the pressure limiting sealing ring (61) through the pressure limiting hole (51) of the lower cover (5), the pressure limiting spring (63) is compressed, the pressure limiting sealing ring (61) moves away from the pressure limiting hole (51), the pressure limiting hole (51) is opened, the water flow is discharged from the drainage channel (54), and the water pressure of the pipeline is discharged; When the pressure drops to the second preset threshold, the pressure limiting spring (4) resets, the pressure limiting sealing ring (61) seals the pressure limiting hole of the lower cover, and the normal working pressure of the water passage is maintained; After the reset of the pressure limiting spring (4), the water passage end of the upper cover (2) is tightly fitted with the groove, the water flow is discharged through the water passage (22), the valve core water passage hole (31) and the drainage hole (55), and the water pressure of the pipeline is discharged. Comprise:

10. A coffee maker, characterized in that The mechanical pressure valve (1) according to any one of claims 1 to 9. ​

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