Coffee outlet nozzle sliding assembly and coffee machine

Abstract

The invention belongs to the technical field of coffee machines, and particularly relates to a coffee outlet nozzle sliding assembly and a coffee machine. Comprising a milk foam outlet, a fresh milk heating cavity connected to the top of the milk foam outlet and a milk pipe connector rotationally connected to one side of the fresh milk heating cavity, the fresh milk heating cavity comprises a mixing cavity and a connecting pipeline connected to one side of the top of the mixing cavity, an air inlet adjusting hole is formed in the inner wall of the connecting pipeline, and a center channel for fresh milk to enter is formed in the milk pipe connector; an air channel is arranged outside the milk pipe connector, air enters the center channel from the air channel, the milk pipe connector is rotated to change the contact area of the air channel and the air inlet adjusting hole, the opening degree of the air channel is adjusted, the opening degree of the air channel is changed from zero to full opening, and then the amount of air entering the fresh milk heating cavity is changed. The coffee machine comprises the coffee outlet nozzle sliding assembly. According to the milk frothing device, milk frothing can be achieved, the air inlet amount can be adjusted, and the milk frothing effect can be changed.

Description

Technical Field

[0001] The invention belongs to the technical field of coffee machines, and in particular relates to a coffee spout sliding assembly and a coffee machine. Background Art

[0002] Currently, most of the milk frothing systems of coffee machines use air valves to control the opening and closing of the air inlet holes, which cannot control the amount of air intake and are relatively costly.

[0003] For some simple coffee machine milk frothing systems, a simple milk frothing structure without an air valve is used. However, the milk frothing structure can only froth milk but cannot simultaneously froth milk or adjust the air intake volume, and thus cannot well meet customer product requirements. Summary of the invention

[0004] In order to solve the above technical problem, some existing simple milk frothing systems of coffee machines adopt a simple milk frothing structure without an air valve. However, the milk frothing structure can only froth milk but cannot simultaneously froth milk or adjust the air intake volume.

[0005] The present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a coffee nozzle sliding assembly, comprising a milk froth nozzle, a fresh milk heating chamber connected to the top of the milk froth nozzle, and a milk pipe joint rotatably connected to one side of the fresh milk heating chamber, the fresh milk heating chamber comprising a mixing chamber, a connecting pipe connected to one side of the top of the mixing chamber, an air intake adjustment hole is arranged on the inner wall of the connecting pipe, a central channel for fresh milk to enter is arranged inside the milk pipe joint, an air channel is arranged outside the milk pipe joint, air enters the central channel from the air channel, the milk pipe joint is rotated to change the contact area between the air channel and the air intake adjustment hole, and the opening of the air channel is adjusted, and the opening of the air channel is changed from zero to fully open, thereby changing the amount of air entering the fresh milk heating chamber.

[0007] Furthermore, a steam nozzle is connected to the top of the fresh milk heating chamber, and the steam nozzle is connected to a steam delivery pipe.

[0008] Furthermore, a matching pipe and a rotating handle connected to the rear end of the matching pipe are arranged outside the central channel of the milk tube connector. After the matching pipe is extended into the connecting pipe, the two are matched and connected. The matching pipe includes a matching pipe body, and a convex ring 1 and a convex ring 2 are arranged on the matching pipe body at intervals. The convex ring 1 is located on the side close to the rotating handle, and the convex ring 2 is located on the side away from the rotating handle.

[0009] Furthermore, an air inlet groove 1 is provided on the convex ring 1, and an air inlet groove 2 is provided on the convex ring 2. The air inlet groove 1 and the air inlet groove 2 are staggered. An air inlet hole is provided on the matching pipe body at the front end of the convex ring 2. The air inlet hole extends to the central channel and the two are connected. The air inlet hole and the air inlet groove 1 are located on the same straight line. The air inlet groove 1, the air inlet groove 2 and the air inlet hole constitute an air channel.

[0010] Furthermore, the depth of the first air inlet groove is less than the depth of the second air inlet groove.

[0011] Furthermore, the inner wall hole at the area on the connecting pipe corresponding to the air inlet hole of the milk pipe joint is the air inlet regulating hole; the air inlet regulating hole is composed of a large arc surface, a small arc surface, and two gradient arc surfaces connecting the large arc surface and the small arc surface; the radius of the large arc surface is greater than the radius of the small arc surface, the radius of the gradient arc surface is between the radius of the large arc surface and the radius of the small arc surface, and the diameter of the gradient arc surface changes from small to large when it transitions from the small arc surface to the large arc surface.

[0012] Furthermore, the diameter of the large arc surface is larger than the diameter of the corresponding position of the milk pipe joint, and there is a gap between the large arc surface and the milk pipe joint to form an air intake space; the diameter of the small arc surface is smaller than the diameter of the corresponding position of the milk pipe joint, and the inner wall of the matching pipe of the fresh milk heating cavity and the milk pipe joint are interference fit, without gap and air intake space; the diameter of the gradual arc surface changes from small to large, and the gap formed between the inner wall of the fresh milk heating cavity corresponding to the gradual arc surface and the milk pipe joint changes from small to large, and the air intake space changes from small to large.

[0013] Furthermore, after rotating the rotating handle, the air inlet hole completely overlaps with the large arc surface, the air inlet hole is open, and the air passage is unobstructed; or the air inlet hole overlaps with the small arc surface, the air inlet hole is in a completely closed state, and the air passage is blocked; or the air inlet hole completely overlaps with the gradient arc surface, the air inlet hole is partially open, and the air passage is partially blocked.

[0014] Furthermore, it also includes a coffee outlet, a milk foam outlet is arranged in the middle of the coffee outlet, the top of the coffee outlet is connected to a coffee delivery pipe, and the top of the coffee outlet is also connected to a hot water delivery pipe.

[0015] Second,

[0016] The present invention further provides a coffee machine, comprising the aforementioned coffee outlet sliding assembly, and the coffee machine can perform the actions of frothing milk and beating milk.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The coffee outlet sliding assembly of the present invention is provided with an air intake regulating hole on the inner wall of the connecting pipe of the fresh milk heating chamber, a central channel for fresh milk to enter is provided inside the milk pipe joint, an air channel is provided outside the milk pipe joint, and air enters the central channel from the air channel; fresh milk is transported into the fresh milk heating chamber from the central channel inside the milk pipe joint, an air channel is provided outside the milk pipe joint, and air enters the central channel from the air channel, the milk pipe joint is rotated to change the contact area between the air channel and the air intake regulating hole, and the opening of the air channel is adjusted from zero to fully open, thereby changing the amount of air entering the fresh milk heating chamber, when the opening of the air channel is zero, only milk is frothed, when the air channel is greater than zero, milk foam can be frothed, and the milk foaming effect is changed with the change of the opening of the air channel, the present invention realizes both milk foaming and milk frothing, and the air intake amount can be adjusted to change the milk foam effect.

[0019] (2) The coffee nozzle sliding assembly of the present invention has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the coffee spout sliding assembly of the present invention;

[0021] Figure 2 is an exploded view of the coffee spout sliding assembly of the present invention;

[0022] Figure 3 This is one of the structural schematic diagrams of the main body of the coffee spout sliding assembly of the present invention;

[0023] Figure 4 This is the second structural schematic diagram of the main body of the coffee spout sliding assembly of the present invention;

[0024] Figure 5 For the present invention Figure 3 Right view of;

[0025] Figure 6 For the present invention Figure 5 The cross-sectional view after cutting in the AA direction;

[0026] Figure 7 It is a structural schematic diagram of the fresh milk heating chamber of the present invention;

[0027] Figure 8 For the present invention Figure 7 The main view;

[0028] Fig. 9 For the present invention Figure 8 The cross-sectional view after cutting in the BB direction;

[0029] Fig.10 For the present invention Figure 8 Cross-sectional view after cutting in CC direction;

[0030] Fig.11 For the present invention Figure 8 The cross-sectional view after cutting in the DD direction;

[0031] Fig.12 This is one of the structural schematic diagrams of the milk pipe connector of the present invention;

[0032] Fig.13 This is the second structural schematic diagram of the milk pipe connector of the present invention;

[0033] Fig.14 For the present invention Fig.12 The main view;

[0034] Fig.15 For the present invention Fig.14 The cross-sectional view after cutting in the EE direction;

[0035] Fig.16 For the present invention Fig.14 The cross-sectional view after cutting in the FF direction;

[0036] Fig.17 For the present invention Fig.14 The cross-sectional view after cutting in the GG direction;

[0037] Fig.18 It is a structural schematic diagram of the milk pipe joint of the present invention connected with the fresh milk heating chamber and the coffee outlet;

[0038] Fig.19 For the present invention Fig.18 The main view;

[0039] Fig. 20 For the present invention Fig.19 A cross-sectional view after cutting in the HH direction;

[0040] Fig.21 For the present invention Fig. 20 A magnified view of point A;

[0041] Fig. 22 For the present invention Fig.19 A cross-sectional view after cutting in the II direction;

[0042] Fig.23 It is a front view of the milk pipe joint of the present invention connected to the fresh milk heating chamber;

[0043] Fig.24 It is a cross-sectional view of the milk pipe joint of the present invention connected to the fresh milk heating chamber in the JJ direction, with the rotating handle facing vertically downward;

[0044] Fig.25 It is a cross-sectional view of the milk pipe joint of the present invention connected to the fresh milk heating chamber in the JJ direction, and the rotating handle is in a horizontal state;

[0045] Fig.26 It is a cross-sectional view of the milk pipe joint of the present invention connected to the fresh milk heating chamber in the JJ direction, and the rotating handle is in a tilted state;

[0046] Fig. 27 is a schematic structural diagram of a coffee machine according to Embodiment 2 of the present invention;

[0047] Fig.28 For the present invention Fig. 27 Schematic diagram of the decomposed structure.

[0048] Reference numerals:

[0049] 100 is the main body of the coffee nozzle sliding assembly; 110 is the coffee nozzle outlet; 120 is the milk foam nozzle outlet; 130 is the fresh milk heating chamber; 131 is the mixing chamber; 132 is the connecting pipe; 133 is the large arc surface; 134 is the small arc surface; 135 is the gradual arc surface; 136 is the air inlet adjustment hole;

[0050] 140 is a milk tube connector; 141 is a rotating handle; 142 is an air inlet groove 1; 143 is an air inlet groove 2; 144 is an air inlet hole; 145 is a matching pipe; 146 is a matching pipe body; 147 is a convex ring 1; 148 is a convex ring 2; 149 is a central channel; 1411 is an air inlet; 150 is a nozzle middle frame; 151 is a nozzle sleeve; 160 is a steam nozzle; 170 is a steam delivery pipe; 180 is a coffee delivery pipe; 190 is a hot water delivery pipe; 200 is a front cover plate of the nozzle; 210 is a back plate of the nozzle; 220 is a sealing ring; 300 is a touch panel assembly; 400 is a coffee machine body. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the protection scope of the present invention.

[0052] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “horizontal”, “left”, “right”, “front”, “back”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0053] Example 1

[0054] Combination Figure 1-Figure 4As shown, the present invention provides a coffee spout sliding assembly, including a coffee spout sliding assembly body 100, and also includes a spout front cover plate 200 arranged on the front side of the coffee spout sliding assembly body 100, and a spout rear back plate 210 arranged on the rear side.

[0055] The main body 100 of the coffee nozzle sliding assembly comprises a coffee nozzle 110, a milk foam nozzle 120 disposed in the middle of the coffee nozzle 110, a fresh milk heating chamber 130 connected to the top of the milk foam nozzle 120, a milk pipe joint 140 connected to one side of the fresh milk heating chamber 130, and a nozzle middle frame 150 connected to the top of the coffee nozzle 110. A sealing ring 220 is disposed between the coffee nozzle 110 and the nozzle middle frame 150, the front side of the nozzle middle frame 150 is buckled and connected to the nozzle front cover plate 200, and the rear side of the nozzle middle frame 150 is buckled and connected to the nozzle back plate 210, and the nozzle front cover plate 200 and the nozzle back plate 210 serve as the outer shell of the main body 100 of the coffee nozzle sliding assembly. The milk pipe joint 140 delivers fresh milk and air to the fresh milk heating chamber 130, and finally outputs hot milk or milk foam through the milk foam nozzle 120.

[0056] The top of the coffee spout 110 is connected to a coffee delivery pipe 180 connected to the rear side of the spout middle frame 150, and coffee liquid can be delivered to the coffee spout 110 through the coffee delivery pipe 180, which is a silicone tube. At the same time, the top of the coffee spout 110 is connected to a hot water delivery pipe 190 provided at the rear side of the spout middle frame 150, and the hot water delivery pipe 190 is also a silicone tube, and hot water can be delivered to the coffee spout 110 through the hot water delivery pipe 190.

[0057] Combination Figure 5-Figure 6 As shown, a steam nozzle 160 is connected to the top of the fresh milk heating chamber 130, and the steam nozzle 160 is sleeved in a nozzle sleeve 151 integrally provided at the front side of the nozzle middle frame 150. A steam delivery pipe 170 is connected to the top of the nozzle sleeve 151. The steam delivery pipe 170 adopts a high-pressure resistant mesh silicone tube. According to the Venturi principle, high-pressure steam enters the steam delivery pipe 170 and is ejected from the steam nozzle 160, generating negative pressure in the fresh milk heating chamber 130.

[0058] Combination Figure 6-Figure 7 As shown, the fresh milk heating chamber 130 includes a mixing chamber 131, a connecting pipe 132 connected to one side of the top of the mixing chamber 131, and a milk pipe joint 140 connected to the inside of the connecting pipe 132. The milk pipe joint 140 is used to connect fresh milk and air, and the negative pressure generated by the fresh milk heating chamber 130 sucks the fresh milk and air connected by the milk pipe joint 140 into the mixing chamber 131.

[0059] Combination Figure 12-Figure 17As shown, the milk tube connector 140 includes a central channel 149 disposed inside for conveying fresh milk and air, a matching pipe 145 is disposed outside the central channel 149, and a rotating handle 141 connected to the rear end of the matching pipe 145 is disposed outside the matching pipe 145. The matching pipe 145 extends into the connecting pipe 132 and the two are matched and connected, thereby connecting the milk tube connector 140 to the fresh milk heating chamber 130.

[0060] The matching pipe 145 includes a matching pipe body 146, on which a convex ring 147 and a convex ring 148 are arranged at intervals. The convex ring 147 is located on the side close to the rotating handle 141, and the convex ring 148 is located on the side away from the rotating handle 141. An air inlet groove 142 is provided on the convex ring 147, and an air inlet groove 143 is provided on the convex ring 148. The air inlet groove 142 and the air inlet groove 143 are arranged in a staggered manner. An air inlet hole 144 is provided on the matching pipe body 146 at the front end of the convex ring 148. The air inlet hole 144 extends to the central channel 149 and the two are connected. The air inlet hole 144 and the air inlet groove 142 are located on the same straight line. The air inlet groove 142, the air inlet groove 2 143, and the air inlet hole 144 constitute an air passage. Fig.12 As shown, the milk pipe connector 140 is provided with an air inlet 1411. The air flows through the air inlet 1411, passes through the air channel, enters the central channel 149, and finally enters the mixing chamber 131 to mix with the fresh milk.

[0061] Combination Figure 18-Figure 26 As shown, when the milk tube connector 140 is inserted into the fresh milk heating chamber 130, air can enter through the gap formed by the air inlet groove 142 and the inside of the connecting pipe 132, and then flow through the gap pipe formed by the assembly of the milk tube connector 140 and the fresh milk heating chamber 130, and then through the gap formed by the air inlet groove 2 143 and the inside of the connecting pipe 132, after reaching the air inlet hole 144, flow through the entire air channel, enter the central channel 149 of the milk tube connector 140, and finally enter the mixing chamber 131 of the fresh milk heating chamber 130 together with the fresh milk.

[0062] The inner wall hole at the area on the connecting pipe 132 corresponding to the air inlet hole 144 is the air inlet adjustment hole 136. By rotating the milk pipe joint 140, the position of the air inlet hole 144 corresponding to the air inlet adjustment hole 136 is changed, so that the opening of the air inlet hole 144 can be changed.

[0063] Specific, combined Figure 8-Figure 11As shown, the air intake adjustment hole 136 is composed of a large arc surface 133, a small arc surface 134, and two gradual arc surfaces 135 connecting the large arc surface 133 and the small arc surface 134. The radius of the large arc surface 133 is greater than the radius of the small arc surface 134, and the radius of the gradual arc surface 135 is between the radius of the large arc surface 133 and the radius of the small arc surface 134. When the diameter of the gradual arc surface 135 transitions from the small arc surface 134 to the large arc surface 133, the diameter changes from small to large.

[0064] like Fig. 20 As shown, the diameter of the large arc surface 133 is larger than the diameter of the corresponding position of the milk tube connector 140, so that an air intake space is formed between the large arc surface 133 and the milk tube connector 140; the diameter of the small arc surface 134 is smaller than the diameter of the corresponding position of the milk tube connector 140, so that the inner wall of the matching pipe 145 of the fresh milk heating cavity 130 and the milk tube connector 140 are interference fit, without gap and air intake space; the diameter of the gradual arc surface 135 changes from small to large, so that the gap formed between the inner wall of the fresh milk heating cavity 130 and the milk tube connector 140 also changes from small to large, that is, the air intake space changes from small to large.

[0065] After rotating the rotary handle 141, the opening of the air inlet hole 144 is changed, and the air inlet hole 144 and the air inlet adjustment hole 136 may be in three situations:

[0066] 1) The air inlet 144 and the large arc surface 133 completely overlap: Fig.24 As shown, when the rotating handle 141 is in a vertical downward state, the air inlet hole 144 completely overlaps with the large arc surface 133, and there is a gap between the air inlet hole 144 and the inner wall of the connecting pipe 132. The air inlet hole 144 is in a completely open state, and the air channel is unobstructed. The air can smoothly enter the central channel 149 of the milk tube joint 140 from the air inlet hole 144, and then be sucked into the mixing cavity 131 of the fresh milk heating cavity 130 together with the fresh milk, and finally the hot milk foam is output from the milk foam outlet 120.

[0067] 2) The air inlet 144 and the small arc surface 134 overlap: Fig.25 As shown, when the rotating handle 141 is in a horizontal state, the air inlet 144 completely overlaps with the small arc surface 134. At this time, the surface of the air inlet 144 and the inner wall of the connecting pipe 132 are squeezed by interference, and the air inlet 144 is in a completely closed state. The air passage is blocked, and the air cannot enter the central channel 149 of the milk tube connector 140 from the air inlet 144. At this time, only fresh milk is sucked into the mixing cavity 131 without air, and finally the milk froth outlet 120 outputs hot milk.

[0068] 3) The air inlet 144 and the gradually changing arc surface 135 completely overlap: Fig.26As shown, when the rotating handle 141 of the milk tube connector 140 is in a tilted state, the air inlet 144 coincides with the gradient arc surface 135, and a portion of the surface of the air inlet 144 and the inner wall of the fresh milk heating chamber 130 are squeezed and sealed, and a portion of the space is open, the air passage is partially blocked, and the amount of air intake changes with the rotation angle of the rotating handle 141, thereby changing the frothing effect of the milk foam and the ratio of the output hot milk foam to the hot fresh milk. Finally, the milk froth outlet 120 outputs hot milk foam of different effects + a certain proportion of hot fresh milk.

[0069] Working principle:

[0070] 1. According to the Venturi principle, high-pressure steam is ejected from a small aperture, and negative pressure will appear around the aperture. The present invention utilizes this principle to design a small-hole pipe next to the aperture (i.e., the milk pipe joint 140 disposed on one side of the steam nozzle 160), and the negative pressure generated in the fresh milk heating chamber 130 by the steam nozzle 160 is used to suck in the refrigerated fresh milk and air from the milk pipe joint 140, and the fresh milk and steam / air fully collide in the mixing chamber 131 to generate hot milk / milk foam, which finally flows out from the milk foam outlet 120.

[0071] 2. After the milk tube connector 140 is inserted into the fresh milk heating chamber 130, air can enter the fresh milk heating chamber 130 through the gap formed by the air inlet groove 142 on the milk tube connector 140 and the fresh milk heating chamber 130, and then pass through the gap formed by the milk tube connector 140 and the fresh milk heating chamber 130 when they are assembled, and then pass through the gap formed by the air inlet groove 2 143 and the fresh milk heating chamber 130, and finally enter the central channel 149 of the milk tube connector 140 from the air inlet hole 144, and finally enter the mixing chamber 131 of the fresh milk heating chamber 130 together with the fresh milk. At the same time, by rotating the rotating handle 141 of the milk tube connector 140, the state of the air inlet hole 144 is changed, and the amount of air entering the fresh milk heating chamber 130 is changed, thereby determining the output of hot milk foam.

[0072] Example 2

[0073] Combination Fig. 27 , Fig.28 As shown, the present invention provides a coffee machine, comprising the coffee spout sliding assembly body 100 of embodiment 1 and a coffee machine body 400, wherein the coffee spout sliding assembly body 100 is mounted on the top of the coffee machine body 400, and the touch panel assembly 300 is connected to the outside of the coffee spout sliding assembly body 100. The coffee machine can perform milk frothing and milk beating actions.

[0074] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0075] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A coffee spout sliding assembly, characterized in that: It includes a milk froth outlet, a fresh milk heating chamber connected to the top of the milk froth outlet, and a milk pipe joint rotatably connected to one side of the fresh milk heating chamber. The fresh milk heating chamber includes a mixing chamber and a connecting pipe connected to one side of the top of the mixing chamber. An air intake regulating hole is arranged on the inner wall of the connecting pipe. A central channel for fresh milk to enter is arranged inside the milk pipe joint. An air channel is arranged outside the milk pipe joint. Air enters the central channel from the air channel. The contact area between the air channel and the air intake regulating hole is changed by rotating the milk pipe joint to adjust the opening of the air channel from zero to fully open, thereby changing the amount of air entering the fresh milk heating chamber.

2. The coffee spout sliding assembly according to claim 1, characterized in that: The top of the fresh milk heating chamber is connected with a steam nozzle, and the steam nozzle is connected with a steam delivery pipe.

3. The coffee spout sliding assembly according to claim 1, characterized in that: A matching pipe and a rotating handle connected to the rear end of the matching pipe are arranged outside the central channel of the milk pipe joint. After the matching pipe is extended into the connecting pipe, the two are matched and connected. The matching pipe includes a matching pipe body. A convex ring 1 and a convex ring 2 are arranged on the matching pipe body at intervals. The convex ring 1 is located on a side close to the rotating handle, and the convex ring 2 is located on a side away from the rotating handle.

4. The coffee spout sliding assembly according to claim 3, characterized in that: An air inlet groove 1 is provided on the convex ring 1, and an air inlet groove 2 is provided on the convex ring 2. The air inlet groove 1 and the air inlet groove 2 are staggered. An air inlet hole is provided on the matching pipe body at the front end of the convex ring 2. The air inlet hole extends to the central channel and the two are connected. The air inlet hole and the air inlet groove 1 are located on the same straight line. The air inlet groove 1, the air inlet groove 2 and the air inlet hole constitute an air channel.

5. The coffee spout sliding assembly according to claim 4, characterized in that: The depth of the first air inlet groove is less than the depth of the second air inlet groove.

6. The coffee spout sliding assembly according to claim 5, characterized in that: The inner wall hole at the area on the connecting pipe corresponding to the air inlet hole of the milk pipe joint is the air inlet regulating hole; the air inlet regulating hole is composed of a large arc surface, a small arc surface, and two gradual arc surfaces connecting the large arc surface and the small arc surface; the radius of the large arc surface is greater than the radius of the small arc surface, the radius of the gradual arc surface is between the radius of the large arc surface and the radius of the small arc surface, and the diameter of the gradual arc surface changes from small to large when the diameter of the gradual arc surface transitions from the small arc surface to the large arc surface.

7. The coffee spout sliding assembly according to claim 6, characterized in that: The diameter of the large arc surface is larger than the diameter of the corresponding position of the milk pipe joint, and there is a gap between the large arc surface and the milk pipe joint to form an air intake space; the diameter of the small arc surface is smaller than the diameter of the corresponding position of the milk pipe joint, and the inner wall of the matching pipe of the fresh milk heating chamber and the milk pipe joint are interference fit, without gap and air intake space; the diameter of the gradual arc surface changes from small to large, and the gap formed between the inner wall of the fresh milk heating chamber corresponding to the gradual arc surface and the milk pipe joint changes from small to large, and the air intake space changes from small to large.

8. The coffee spout sliding assembly according to claim 7, characterized in that: After turning the rotating handle, the air inlet hole completely overlaps with the large arc surface, the air inlet hole is open, and the air passage is unobstructed; or the air inlet hole overlaps with the small arc surface, the air inlet hole is in a completely closed state, and the air passage is blocked; or the air inlet hole completely overlaps with the gradient arc surface, the air inlet hole is partially open, and the air passage is partially blocked.

9. The coffee spout sliding assembly according to any one of claims 1 to 8, characterized in that: The utility model also comprises a coffee outlet, a milk foam outlet is arranged in the middle of the coffee outlet, a coffee delivery pipe is connected to the top of the coffee outlet, and a hot water delivery pipe is also connected to the top of the coffee outlet.

10. A coffee machine, characterized in that: The coffee machine comprises the coffee spout sliding assembly as claimed in claim 9 and is capable of making milk froth and milk.

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