Valve assembly, pressure pump and coffee machine

Abstract

The utility model provides a valve assembly, pressure pump and coffee maker, the valve assembly includes valve seat, bonnet, water inlet check valve and water outlet check valve, the valve seat is equipped with valve seat water inlet channel and valve seat water outlet channel, the valve seat is equipped with diaphragm mounting portion on the side far away from bonnet, the bonnet is equipped with bonnet water inlet channel and bonnet water outlet channel, the bonnet is equipped with diaphragm mounting portion on the side far away from bonnet water inlet channel and bonnet water outlet channel. The valve seat water inlet channels extend in an arc shape, the number of the valve seat water inlet channels is two or more, the water outlet check valve comprises a first valve plate and a first installation part, the first valve plate is located on the downstream side of the valve seat water inlet channels and can cover the valve seat water inlet channels, the first installation part is connected with the valve seat, and the first valve plate is in a convex arc shape and protrudes towards the diaphragm installation part. The valve assembly can prevent the water inlet and outlet hole from being blocked, meanwhile, water entering the pressure cavity can flow out conveniently, and the pressure pump pumps water stably.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure pumps, in particular to a valve assembly, a pressure pump and a coffee machine. Background Art

[0002] The existing micro water pump is provided with circular motion by the motor, and then the diaphragm inside the pressure pump is reciprocated by mechanical devices, thereby compressing and stretching the air in the pump cavity. Under the action of the one-way valve assembly, positive pressure is formed at the drain port, and vacuum is formed at the water pump port, thereby generating a pressure difference with the external atmospheric pressure. Under the action of the pressure difference, water is pressed into the water inlet and then discharged from the drain port.

[0003] The existing diaphragm usually includes an integrally formed diaphragm portion and a fixed portion. The fixed portion extends along the axial direction of the diaphragm and is fixed to the end of a connecting rod. When the connecting rod reciprocates, it continuously applies a push-pull force to the diaphragm. Under the push-pull force, the position where the diaphragm is connected to the fixed portion is easily torn, thereby affecting the operation of the pressure pump.

[0004] In addition, the existing valve seat is usually provided with circular water inlet and outlet holes, which are small in size and easily blocked, and a single hole easily causes unstable force on the valve plate, resulting in the inability of the pressure pump to pump water stably. Utility Model Content

[0005] The first object of the utility model is to provide a valve assembly which can prevent the water inlet and outlet holes from being blocked and facilitate the water flow entering the pressure chamber to flow out and the pressure pump to pump water stably.

[0006] The second object of the utility model is to provide a pressure pump using the valve assembly.

[0007] The second object of the utility model is to provide a coffee machine using the pressure pump.

[0008] To achieve the above-mentioned first purpose, the utility model provides a valve assembly, including a valve seat, a valve cover, an inlet check valve and a water outlet check valve, the valve seat is provided with a valve seat inlet channel and a valve seat outlet channel, and a diaphragm mounting portion is provided on the side of the valve seat away from the valve cover; the valve cover is provided with a valve cover inlet channel and a valve cover outlet channel; the valve seat inlet channel extends in an arc shape, and the number of the valve seat inlet channels is more than two, the water outlet check valve includes a first valve plate and a first mounting portion, the first valve plate is located on the downstream side of the valve seat inlet channel and can cover each valve seat inlet channel, the first mounting portion is connected to the valve seat, the first valve plate is in a convex arc shape and convexes toward the diaphragm mounting portion; and / or the valve seat outlet channel extends in an arc shape, the number of the valve seat outlet channels is more than two, the water inlet check valve includes a second valve plate and a second mounting portion, the second valve plate is located on the downstream side of the valve seat outlet channel and can cover each valve seat outlet channel, the second mounting portion is connected to the valve seat, the second valve plate is in a convex arc shape and convexes toward the valve cover.

[0009] It can be seen from the above scheme that by setting the valve seat water inlet channel and / or the valve seat water outlet channel to extend in an arc shape, compared with the existing circular water inlet and outlet holes, the arrangement of multiple arc holes in the utility model facilitates water flow into and out of the pressure chamber, and the stability of liquid flow is higher, while avoiding blockage of the water inlet and outlet channels. In addition, the first valve plate and / or the second valve plate are convex arc-shaped, which is convenient for cutting off or opening the corresponding water inlet and outlet channels when subjected to the force of water.

[0010] A preferred solution is that a first fixing hole is opened on the valve seat, the first mounting portion is plug-fitted into the first fixing hole, and each valve seat water inlet channel is arranged around the radial outside of the first fixing hole.

[0011] It can be seen from this that the water inlet channels of each valve seat are arranged around the radial outside of the first fixed hole to ensure that when the water flows through the inlet channels of each valve seat to the first valve plate, the first valve plate is subjected to stable force, thereby avoiding uneven force causing deformation and inability to reset, thereby failing to achieve the water flow cutoff effect.

[0012] A further solution is that the water inlet channels of the valve seats are arranged on a common circumference and at intervals, and the circle where the water inlet channels of the valve seats are located is co-centered with the first fixing hole.

[0013] This shows that the stability of the force applied to the first valve plate is further improved.

[0014] A further solution is that a first limiting boss is arranged in the middle part of the first mounting part, and the first limiting boss includes a first limiting wall and a first guiding inclined wall; the first limiting wall is arranged toward the first valve plate, and the first limiting wall is arranged perpendicular to the first mounting part; the first guiding inclined wall is arranged back to the first valve plate, and the diameter of the first guiding inclined wall gradually increases from one end away from the first limiting wall to one end close to the first limiting wall.

[0015] It can be seen that the first limiting boss can prevent the water outlet check valve from falling off the valve seat, and the provision of the first guiding inclined wall facilitates the assembly of the water outlet check valve.

[0016] A preferred solution is that a second fixing hole is opened on the valve seat, the second mounting portion is plug-fitted into the second fixing hole, and each valve seat water outlet channel is arranged around the radial outside of the second fixing hole.

[0017] It can be seen from this that the water outlet channels of each valve seat are arranged around the radial outside of the second fixed hole to ensure that when the water flows through the outlet channels of each valve seat to the second valve plate, the second valve plate is subjected to stable force, thereby avoiding uneven force causing deformation and inability to reset, thereby failing to achieve the water flow cutoff effect.

[0018] A further solution is that the water outlet channels of the valve seats are arranged on a common circumference and at intervals, and the circle where the water outlet channels of the valve seats are located is co-centered with the second fixing hole.

[0019] This shows that the stability of the force applied to the second valve plate is further improved.

[0020] A further solution is that a second limiting boss is provided in the middle part of the second mounting part, and the second limiting boss includes a second limiting wall and a second guiding inclined wall; the second limiting wall is arranged toward the second valve plate, and the second limiting wall is arranged perpendicular to the second mounting part; the second guiding inclined wall is arranged back to the second valve plate, and the diameter of the second guiding inclined wall gradually increases from the end away from the second limiting wall to the end close to the second limiting wall.

[0021] It can be seen that the second limiting boss can prevent the water inlet check valve from falling off the valve seat, and the provision of the second guiding inclined wall facilitates the assembly of the water inlet check valve.

[0022] To achieve the above second objective, the utility model provides a pressure pump, including a diaphragm drive assembly and the above valve assembly, wherein the diaphragm of the diaphragm drive assembly is located at the diaphragm mounting portion.

[0023] A preferred solution is that the diaphragm drive assembly also includes a connecting member, a first end of the connecting member is provided with a crankshaft connecting portion, the axis of the crankshaft connecting portion is perpendicular to the moving direction of the connecting member, and the diaphragm is arranged at the second end of the connecting member; the connecting member is provided with an abutment surface, and the abutment surface is arranged toward the diaphragm; as the connecting member moves toward the diaphragm, the abutment surface applies a force to the diaphragm to force the diaphragm to deform; as the connecting member moves away from the diaphragm, the force between the abutment surface and the diaphragm is reduced, and the diaphragm is reset.

[0024] It can be seen that as the connecting piece moves toward the diaphragm, the abutting surface applies a force to the diaphragm to force the diaphragm to deform; as the connecting piece moves away from the diaphragm, the force between the abutting surface and the diaphragm decreases, and the diaphragm is reset. Therefore, when the crankshaft connecting part applies a force to the connecting piece to drive the connecting piece to move away from the diaphragm, the connecting piece has no pulling force or very small pulling force on the diaphragm, so it will not cause the diaphragm to tear, thereby avoiding affecting the operation of the pressure pump using the diaphragm drive assembly.

[0025] To achieve the third objective, the utility model provides a coffee machine including the pressure pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the first embodiment of the pressure pump of the utility model along the axial direction of the motor.

[0027] Figure 2 It is a structural exploded view of the first embodiment of the pressure pump of the utility model.

[0028] Figure 3 It is a structural exploded view from a first perspective of the connector and the diaphragm in the first embodiment of the diaphragm drive assembly of the utility model.

[0029] Figure 4 It is a structural exploded view from a second perspective of the connector and the diaphragm in the first embodiment of the diaphragm drive assembly of the utility model.

[0030] Figure 5 It is a structural diagram of the connecting member and the diaphragm in the first embodiment of the diaphragm drive assembly of the utility model.

[0031] Figure 6 It is a cross-sectional view of the first embodiment of the pressure pump of the utility model along the radial direction of the motor.

[0032] Figure 7 It is a structural exploded view from a first perspective of a valve assembly in a first embodiment of a pressure pump of the utility model.

[0033] Figure 8 It is a structural exploded view of the valve assembly in the first embodiment of the pressure pump of the utility model from a second perspective.

[0034] Fig. 9 It is a cross-sectional view of the valve assembly, the diaphragm and the connecting piece in the second embodiment of the pressure pump of the utility model.

[0035] Fig.10 yes Fig. 9 A partial enlarged view of point A in the middle.

[0036] Fig.11 It is a structural exploded view of the valve assembly in the second embodiment of the pressure pump of the utility model.

[0037] Fig.12 It is a structural diagram of the valve seat in the second embodiment of the pressure pump of the utility model.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0039] First embodiment of the valve assembly, diaphragm drive assembly and pressure pump:

[0040] See also Figures 1 to 6 The pressure pump of this embodiment includes a pump housing 11, a valve assembly 12 and a diaphragm drive assembly 13.

[0041] See also Figures 6 to 8The valve assembly 12 includes a valve seat 121, a valve plate assembly 122, a valve cover 123 and a water inlet plug 125. The valve seat 121 is provided with a valve seat water inlet channel 1211 and a valve seat water outlet channel 1212. The valve plate assembly 122 is located between the valve seat 121 and the valve cover 123. The valve plate assembly 122 includes a water inlet check valve 1221 and a water outlet check valve 1222. The valve cover 123 is provided with a valve cover water inlet channel 1231 and a valve cover water outlet channel 1232. The water inlet check valve 1221 is arranged between the valve seat water outlet channel 1212 and the valve cover water outlet channel 1232. The water outlet check valve 1222 is arranged between the valve seat water inlet channel 1211 and the valve cover water inlet channel 1231. The water inlet plug 125 is detachably mounted on the water outlet end of the valve cover water inlet channel 1231. A water inlet plug channel 1251 is axially penetrated through the water inlet plug 125. The number of the water inlet plug channels 1251 is more than two. The plurality of water inlet plug channels 1251 are arranged at intervals along the circumference of the water inlet plug 125. Each water inlet plug channel 1251 can be covered by the water outlet check valve 1222.

[0042] The outer periphery of the valve plate assembly 122 is clamped between the valve seat 121 and the valve cover 123, and the water outlet end of the valve cover water inlet channel 1231 and the water inlet end of the valve seat water inlet channel 1211 form a mounting groove 126. The water inlet plug 125 is arranged in the mounting groove 126, and the axial direction of the water inlet plug 125 is perpendicular to the plane where the water outlet check valve 1222 is located. In the axial direction of the water inlet plug 125, the end wall of the mounting groove 126 and the water outlet check valve 1222 are respectively limitedly matched with the water inlet plug 125 at both ends of the water inlet plug 125.

[0043] The water inlet plug 125 includes a support column 1252 and a plug channel portion 1253 arranged along the axial direction, the support column 1252 abuts against the end wall of the mounting groove 126, the plug channel portion 1253 abuts against the water outlet check valve 1222, the outer diameter of the plug channel portion 1253 is larger than the diameter of the support column 1252, the water inlet plug channel 1251 is located on the plug channel portion 1253 and penetrates the plug channel portion 1253 along the axial direction, and the water inlet plug channel 1251 is recessed inward from the outer peripheral wall of the water inlet plug 125 along the radial direction of the water inlet plug 125.

[0044] The water outlet check valve 1222 is used to block the water inlet plug channel 1251 when water is discharged. When water is discharged, the valve cover water outlet channel 1232 is opened, and the support column 1252 supports the water outlet check valve 1222 when the diaphragm 16 of the diaphragm drive assembly 13 moves toward the side of the valve assembly 12. At this time, the water outlet check valve 1222 is attached to the end wall of the plug channel portion 1253 of the water inlet plug 125 and covers the water inlet plug channel 1251.

[0045] The water inlet check valve 1221 is used to block the water inlet end of the valve seat water inlet channel 1211 when water is entering. When water is entering, when the diaphragm 16 moves toward the side of the valve assembly 12, due to the smaller diameter of the support column 1252, more liquid can enter the installation groove 126. The liquid passes through the water inlet plug channel 1251, and then enters the valve seat water inlet channel 1211 from the side of the water inlet plug channel 1251 through the water flow channel 1223 on the valve assembly 12.

[0046] See also Figures 1 to 6 The diaphragm driving assembly 13 includes a driving member 14, a connecting member 15 and a diaphragm 16. The driving member 14 is a motor. A crankshaft connecting portion 151 is provided at the first end of the connecting member 15. The crankshaft connecting portion 151 is connected to the driving shaft 131 of the driving member 14 through an eccentric shaft 132. The driving member 14 drives the eccentric shaft 132 to rotate, thereby driving the connecting member 15 to reciprocate. The axis of the crankshaft connecting portion 151 is perpendicular to the moving direction of the connecting member 15.

[0047] The diaphragm 16 is disposed at the second end of the connector 15. The diaphragm 16 is made of an elastic material such as rubber or silicone, and the diaphragm 16 is disposed separately from the connector 15. Specifically, the diaphragm 16 includes an integrally formed diaphragm portion 161 and a mounting portion 162. The diaphragm portion 161 in this embodiment is in the shape of a circular plate. The mounting portion 162 extends outward from the diaphragm portion 161 toward the side wall of the connector 15 along the axial direction of the diaphragm portion 161. The projection of the connection position 166 between the mounting portion 162 and the diaphragm portion 161 along the moving direction of the connector 15 is located within the abutment surface 154 of the connector 15. When the connector 15 moves toward the diaphragm 16, there is a first contact area between the connector 15 and the diaphragm 16; when the connector 15 moves away from the diaphragm 16, there is a second contact area between the connector 15 and the diaphragm 16. The second contact area is smaller than the first contact area. For ease of understanding, Figure 6 The state shown is explained, when the diaphragm portion 161 is in Figure 6 When the connector 15 is in the undeformed position, only the front end of the contact surface 154 contacts the diaphragm portion 161. When the connector 15 continues to move to the left, the contact area between the diaphragm portion 161 and the contact surface 154 gradually increases. When the connector 15 is at the left end limit position, the contact area between the connector 15 and the diaphragm 16 is the largest. Figure 6 When the position shown continues to move rightward, the contact area between the diaphragm portion 161 and the abutment surface 154 gradually decreases. When the connector 15 is at the right extreme position, the contact area between the connector 15 and the diaphragm 16 is the smallest.

[0048] A limiting boss 163 is provided in the middle of the mounting portion 162. The limiting boss 163 includes a limiting wall 164 and a guiding oblique wall 165. The limiting wall 164 is provided toward the diaphragm portion 161, and the limiting wall 164 is provided perpendicular to the mounting portion 162. The guiding oblique wall 165 is provided away from the diaphragm portion 161. The diameter of the guiding oblique wall 165 gradually increases from the end away from the limiting wall 164 to the end close to the limiting wall 164. The setting of the guiding oblique wall 165 facilitates the worker to install the mounting portion 162 into the positioning hole 155 of the connector 15 along the axial direction of the mounting portion 162. The setting of the limiting wall 164 prevents the mounting portion 162 from being separated from the diaphragm connector 153 when the mounting portion 162 is subjected to the pulling force of the connector 15.

[0049] The connecting member 15 includes a crankshaft connecting member 152 and a diaphragm connecting member 153 arranged along the moving direction of the connecting member 15, the crankshaft connecting portion 151 is located on the crankshaft connecting member 152, the abutting surface 154 is located on the diaphragm connecting member 153 and is arranged toward the diaphragm portion 161, and the abutting surface 154 can abut against the diaphragm portion 161. Preferably, the abutting surface 154 is a convex arc surface convex toward the diaphragm portion 161.

[0050] As the connecting member 15 moves toward the diaphragm 16 , the abutting surface 154 applies a force to the diaphragm 16 to force the diaphragm 16 to deform; as the connecting member 15 moves away from the diaphragm 16 , the force between the abutting surface 154 and the diaphragm 16 decreases, and the diaphragm 16 is restored.

[0051] The connector 15 is provided with a positioning hole 155, which extends from the middle of the abutting surface 154 of the connector 15 in a direction away from the diaphragm portion 161, and the mounting portion 162 extends into the positioning hole 155. The limiting wall 164 of the upper limit boss 163 of the mounting portion 162 cooperates with the diaphragm connector 153 to limit the movement direction of the connector 15.

[0052] A diaphragm positioning groove 120 (i.e., a diaphragm mounting portion) is formed between the valve seat 121 and the pump housing 11, the diaphragm portion 161 is located at the diaphragm positioning groove 120 and the outer peripheral edge of the diaphragm portion 161 is clamped between the valve seat 121 and the pump housing 11, and a clearance groove 124 is also provided on the valve seat 121 on the side facing the pump housing 11, the clearance groove 124 is recessed from the bottom wall of the diaphragm positioning groove 120 toward a direction away from the pump housing 11, the diaphragm portion 161 and the clearance groove 124 form a pressure chamber, the valve seat water inlet channel 1211 and the valve seat water outlet channel 1212 are connected through the pressure chamber, the diaphragm connector 153 is arranged opposite to the clearance groove 124, and the projection of the diaphragm connector 153 along the moving direction of the connector 25 is located in the clearance groove 124.

[0053] A limiting groove 156 is also provided on the diaphragm connector 153, an insertion port 157 is provided above the limiting groove 156, a clearance opening 158 is provided on the side of the limiting groove 156 away from the diaphragm portion 161, and one end of the crankshaft connector 152 away from the crankshaft connecting portion 151 is inserted into the limiting groove 156 from the insertion port 157 along the vertical direction, and the crankshaft connector 152 passes through the clearance opening 158 along the moving direction of the connector 15, and the crankshaft connector 152 and the diaphragm connector 153 cooperate in the limit position in the moving direction of the connector 15.

[0054] During assembly, the mounting portion 162 can be first inserted into the positioning hole 155 to achieve the limiting between the diaphragm 16 and the diaphragm connector 153, and then, the assembly formed by the diaphragm 16 and the diaphragm connector 153 is placed at the first opening 111 on the front side of the pump housing 11, and then, the crankshaft connector 152 is assembled downward from the second opening 112 on the upper side of the pump housing 11 along the vertical direction until the crankshaft connector 152 is inserted into the limiting groove 156 from the insertion port 157, thereby completing the assembly of the diaphragm 16, the diaphragm connector 153 and the crankshaft connector 152. The assembly process is simple, which can improve the assembly efficiency and thus improve the production efficiency.

[0055] As can be seen from the above, by setting the diaphragm and the connecting member separately, as the connecting member moves toward the diaphragm, the abutting surface applies a force to the diaphragm to force the diaphragm to deform; as the connecting member moves away from the diaphragm, the force between the abutting surface and the diaphragm decreases, and the diaphragm is reset. Therefore, when the crankshaft connecting part applies a force to the connecting member to drive the connecting member to move in a direction away from the diaphragm, due to the small contact area between the mounting part and the diaphragm part, when the mounting part applies a pulling force to the diaphragm part, the force received is concentrated at the center of the diaphragm part. Therefore, the deformation of the diaphragm part is small, and the diaphragm will not be torn, thereby avoiding affecting the operation of the pressure pump using the diaphragm drive assembly. In addition, by setting a water inlet plug or a water outlet plug, the valve seat, the valve cover and the corresponding water inlet and outlet arranged thereon are separated. In this way, a smaller water inlet plug channel and a water outlet plug channel can be set as needed, thereby increasing the outlet water pressure and improving the coffee extraction effect. In addition, by forming the corresponding water inlet and outlet channels on each plug separately, the forming process is also simpler due to the simple structure of the plug.

[0056] Second embodiment of the valve assembly, diaphragm drive assembly and pressure pump:

[0057] As an explanation of the second embodiment of the valve assembly, diaphragm drive assembly and pressure pump of the utility model, only the differences from the first embodiment of the valve assembly, diaphragm drive assembly and pressure pump are explained below.

[0058] See also Figures 9 to 12 In this embodiment, the valve plate assembly 2 only includes a water inlet check valve 21 and a water outlet check valve 22 .

[0059] The valve seat water inlet channel 231 extends in an arc shape, and the number of the valve seat water inlet channels 231 is more than two. In the present embodiment, the number of the valve seat water inlet channels 231 is three. The water outlet check valve 22 comprises a first valve plate 221 and a first mounting portion 222. The first valve plate 221 is located on the downstream side of the valve seat water inlet channel 231 and can cover each valve seat water inlet channel 231. The first mounting portion 222 is connected to the valve seat 24. The first valve plate 221 is in a convex arc shape and convexly projects toward the diaphragm mounting portion 220.

[0060] The valve seat water outlet channel 232 extends in an arc shape, and the number of the valve seat water outlet channels 232 is more than two. In this embodiment, the number of the valve seat water outlet channels 232 is three. The water inlet check valve 21 includes a second valve plate 211 and a second mounting portion 212. The second valve plate 211 is located on the downstream side of the valve seat water outlet channel 232 and can cover each valve seat water outlet channel 232. The second mounting portion 212 is connected to the valve seat 24. The second valve plate 211 is in a convex arc shape and convexes toward the valve cover 25.

[0061] A first fixing hole 241 is provided on the valve seat 24, and the first mounting portion 222 is plugged into the first fixing hole 241. The water inlet channels 231 of each valve seat are arranged around the radial outside of the first fixing hole 241. The water inlet channels 231 of each valve seat are arranged on the same circumference and at intervals, and the circle where the water inlet channels 231 of each valve seat are located is co-centered with the first fixing hole 241.

[0062] A first limiting boss 223 is disposed in the middle of the first mounting portion 222. The first limiting boss 223 includes a first limiting wall 224 and a first guiding inclined wall 225. The first limiting wall 224 is disposed toward the first valve disc 221, and the first limiting wall 224 is disposed perpendicular to the first mounting portion 222. The first guiding inclined wall 225 is disposed away from the first valve disc 221. The diameter of the first guiding inclined wall 225 gradually increases from the end away from the first limiting wall 224 to the end close to the first limiting wall 224. The water inlet channels 231 of each valve seat are arranged around the radial outer side of the first fixing hole 241 to ensure that when the water flows through the water inlet channels 231 of each valve seat to the first valve disc 221, the first valve disc 221 is subjected to a stable force, so as to avoid the inability to reset after deformation due to uneven force, thereby failing to achieve the function of cutting off the water flow. In addition, the first limiting boss 223 can prevent the water outlet check valve 22 from falling off the valve seat 24 , and the provision of the first guiding inclined wall 225 facilitates the assembly of the water outlet check valve 22 .

[0063] A second fixing hole 242 is also provided on the valve seat 24, and the second mounting portion 212 is plugged into the second fixing hole 242. Each valve seat water outlet channel 232 is arranged around the radial outside of the second fixing hole 242. Each valve seat water outlet channel 232 is arranged on the same circumference and at intervals. The circle where each valve seat water outlet channel 232 is located is co-centered with the second fixing hole 242.

[0064] A second limiting boss 213 is arranged in the middle of the second mounting portion 212, and the second limiting boss 213 includes a second limiting wall 214 and a second guiding inclined wall 215. The second limiting wall 214 is arranged toward the second valve plate 211, and the second limiting wall 214 is arranged perpendicular to the second mounting portion 212. The second guiding inclined wall 215 is arranged away from the second valve plate 211, and the diameter of the second guiding inclined wall 215 gradually increases from one end away from the second limiting wall 214 to one end close to the second limiting wall 214. The water outlet channels 232 of each valve seat are arranged around the radial outer side of the second fixing hole 242 to ensure that when the water flows through the water outlet channels 232 of each valve seat to the second valve plate 211, the force on the second valve plate 211 is stable, thereby avoiding uneven force causing deformation and inability to reset, thereby failing to achieve the water flow cutoff effect. In addition, the second limiting boss 213 can prevent the water inlet check valve 21 from falling off the valve seat 24, and the setting of the second guide inclined wall 215 facilitates the assembly of the water inlet check valve 21.

[0065] As can be seen from the above, by setting the valve seat water inlet channel and / or the valve seat water outlet channel to extend in an arc shape, compared with the existing circular water inlet and outlet holes, the arrangement of multiple arc holes in the utility model facilitates water flow into and out of the pressure chamber, and the stability of liquid flow is higher, while avoiding blockage of the water inlet and outlet channels. In addition, the first valve plate and / or the second valve plate are convex arc-shaped, which is convenient for cutting off or opening the corresponding water inlet and outlet channels when subjected to the force of water.

[0066] Coffee machine embodiment:

[0067] The coffee machine in this embodiment includes a coffee brewing unit and a pressure pump in the above-mentioned pressure pump embodiments, and the pressure pump is used to inject water into the coffee brewing unit.

[0068] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve assembly, comprising a valve seat, a valve cover, a water inlet check valve and a water outlet check valve, wherein the valve seat is provided with a valve seat water inlet channel and a valve seat water outlet channel, and a diaphragm mounting portion is provided on a side of the valve seat away from the valve cover; The valve cover is provided with a valve cover water inlet channel and a valve cover water outlet channel; Features: The valve seat water inlet channel extends in an arc shape, the number of the valve seat water inlet channels is more than two, the water outlet check valve comprises a first valve plate and a first mounting portion, the first valve plate is located at the downstream side of the valve seat water inlet channel and can cover each of the valve seat water inlet channels, the first mounting portion is connected to the valve seat, the first valve plate is in a convex arc shape and convex toward the diaphragm mounting portion; and / or The valve seat water outlet channel extends in an arc shape, and the number of the valve seat water outlet channels is more than two. The water inlet check valve includes a second valve plate and a second mounting portion. The second valve plate is located on the downstream side of the valve seat water outlet channel and can cover each of the valve seat water outlet channels. The second mounting portion is connected to the valve seat, and the second valve plate is in a convex arc shape and convex toward the valve cover.

2. The valve assembly according to claim 1, characterized in that: The valve seat is provided with a first fixing hole, the first mounting portion is plugged into and matched with the first fixing hole, and each of the valve seat water inlet channels is arranged around the radial outer side of the first fixing hole.

3. The valve assembly according to claim 2, characterized in that: The water inlet channels of the valve seats are arranged on the same circumference and at intervals, and the circle where the water inlet channels of the valve seats are located has the same center as the first fixing hole.

4. The valve assembly according to claim 2, characterized in that: A first limiting boss is provided at the middle of the first mounting portion, and the first limiting boss includes a first limiting wall and a first guiding inclined wall; The first limiting wall is arranged toward the first valve plate, and the first limiting wall is arranged perpendicular to the first mounting portion; The first guiding inclined wall is arranged to face away from the first valve plate, and the diameter of the first guiding inclined wall gradually increases from an end away from the first limiting wall to an end close to the first limiting wall.

5. The valve assembly according to any one of claims 1 to 4, characterized in that: The valve seat is provided with a second fixing hole, the second mounting portion is plug-fitted into the second fixing hole, and each of the valve seat water outlet channels is arranged around the radial outer side of the second fixing hole.

6. The valve assembly according to claim 5, characterized in that: The water outlet channels of the valve seats are arranged on the same circumference and at intervals, and the circle where the water outlet channels of the valve seats are located has the same center as the second fixing hole.

7. The valve assembly according to claim 5, characterized in that: A second limiting boss is disposed at the middle portion of the second mounting portion, and the second limiting boss includes a second limiting wall and a second guiding inclined wall; The second limiting wall is arranged toward the second valve plate, and the second limiting wall is arranged perpendicular to the second mounting portion; The second guiding inclined wall is arranged to face away from the second valve plate, and the diameter of the second guiding inclined wall gradually increases from an end away from the second limiting wall to an end close to the second limiting wall.

8. A pressure pump, characterized in that: The invention comprises a diaphragm drive assembly and the valve assembly according to any one of claims 1 to 7, wherein the diaphragm of the diaphragm drive assembly is located at a diaphragm mounting portion.

9. The pressure pump according to claim 8, characterized in that: The diaphragm drive assembly further comprises a connecting member, a first end of the connecting member is provided with a crankshaft connecting portion, an axis of the crankshaft connecting portion is perpendicular to a moving direction of the connecting member, and the diaphragm is provided at a second end of the connecting member; The connecting member is provided with an abutting surface, and the abutting surface is arranged toward the diaphragm; As the connecting member moves toward the diaphragm, the abutting surface applies a force to the diaphragm to force the diaphragm to deform; As the connecting member moves away from the diaphragm, the force between the abutting surface and the diaphragm decreases, and the diaphragm is restored.

10. A coffee machine, characterized in that Comprising a pressure pump as claimed in claim 8 or 9.

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